[PATCH v3 00/52] mtd: rework ECC layout definition

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Revision v3 of 5 in this series.

66 messages, 4 authors, 2016-03-05 · open the first message on its own page

[PATCH v3 00/52] mtd: rework ECC layout definition

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:58:27 

Hello,

This patchset aims at getting rid of the nand_ecclayout limitations.
struct nand_ecclayout is defining fixed eccpos and oobfree arrays which
can only be increased by modifying the MTD_MAX_ECCPOS_ENTRIES_LARGE and
MTD_MAX_OOBFREE_ENTRIES_LARGE macros.
This approach forces us to modify the macro values each time we add a
new NAND chip with a bigger OOB area, and increasing these arrays also
penalize all platforms, even those who only support small NAND devices
(with small OOB area).

The idea to overcome this limitation, is to define the ECC/OOB layout
by the mean of two functions: ->ecc() and ->free(), which will
basically return the same information has those stored in the
nand_ecclayout struct.

Another advantage of this solution is that ECC layouts are usually
following a repetitive pattern (i.e. leave X bytes free and put Y bytes
of ECC per ECC chunk), which allows one to implement the ->ecc()
and ->free() functions with a simple logic that can be applied
to any size of OOB.

Patches 1 to 4 are just cleanups or trivial fixes that can be taken
independently.

Also note that the last two commits are removing the nand_ecclayout
definition, thus preventing any new driver to use this structure.
Of course, this step can be delayed if some of the previous patches
are not accepted.

Best Regards,

Boris

Changes since v2:
- fixed a few bugs in the core and driver implementations

Changes since v1:
- unified the way of defining ECC and free bytes
- fixed a few bugs in some ->ecc()/->free() implementations
- added new helpers to ease ECC and free bytes manipulation
- separated driver changes in different commits to ease review
- dropped already applied patches

*** BLURB HERE ***

Boris Brezillon (52):
  mtd: kill the ecclayout->oobavail field
  mtd: create an mtd_oobavail() helper and make use of it
  mtd: mtdswap: remove useless if (!mtd->ecclayout) test
  mtd: nand: simplify nand_bch_init() usage
  mtd: add mtd_ooblayout_xxx() helper functions
  mtd: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate
  mtd: add mtd_set_ecclayout() helper function
  mtd: use mtd_set_ecclayout() where appropriate
  mtd: nand: use mtd_set_ecclayout() where appropriate
  mtd: onenand: use mtd_set_ecclayout() where appropriate
  mtd: docg3: use mtd_set_ecclayout() where appropriate
  mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition
  mtd: docg3: switch to mtd_ooblayout_ops
  mtd: nand: implement the default mtd_ooblayout_ops
  mtd: nand: bch: switch to mtd_ooblayout_ops
  mtd: nand: sharpsl: switch to mtd_ooblayout_ops
  mtd: nand: jz4740: switch to mtd_ooblayout_ops
  mtd: nand: atmel: switch to mtd_ooblayout_ops
  mtd: nand: bf5xx: switch to mtd_ooblayout_ops
  mtd: nand: brcm: switch to mtd_ooblayout_ops
  mtd: nand: cafe: switch to mtd_ooblayout_ops
  mtd: nand: davinci: switch to mtd_ooblayout_ops
  mtd: nand: denali: switch to mtd_ooblayout_ops
  mtd: nand: diskonchip: switch to mtd_ooblayout_ops
  mtd: nand: docg4: switch to mtd_ooblayout_ops
  mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops
  mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops
  mtd: nand: fsmc: switch to mtd_ooblayout_ops
  mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct
  mtd: nand: gpmi: switch to mtd_ooblayout_ops
  mtd: nand: hisi504: switch to mtd_ooblayout_ops
  mtd: nand: jz4780: switch to mtd_ooblayout_ops
  mtd: nand: lpc32xx: switch to mtd_ooblayout_ops
  mtd: nand: mxc: switch to mtd_ooblayout_ops
  mtd: nand: omap2: switch to mtd_ooblayout_ops
  mtd: nand: pxa3xx: switch to mtd_ooblayout_ops
  mtd: nand: s3c2410: switch to mtd_ooblayout_ops
  mtd: nand: sh_flctl: switch to mtd_ooblayout_ops
  mtd: nand: sm_common: switch to mtd_ooblayout_ops
  mtd: nand: sunxi: switch to mtd_ooblayout_ops
  mtd: nand: vf610: switch to mtd_ooblayout_ops
  mtd: onenand: switch to mtd_ooblayout_ops
  staging: mt29f_spinand: switch to mtd_ooblayout_ops
  mtd: nand: kill the ecc->layout field
  mtd: kill the nand_ecclayout struct

 arch/arm/mach-pxa/spitz.c                       |  55 +++-
 arch/mips/include/asm/mach-jz4740/jz4740_nand.h |   2 +-
 arch/mips/jz4740/board-qi_lb60.c                |  87 +++---
 drivers/mtd/devices/docg3.c                     |  51 +++-
 drivers/mtd/mtdchar.c                           | 123 ++++++--
 drivers/mtd/mtdconcat.c                         |   2 +-
 drivers/mtd/mtdcore.c                           | 358 ++++++++++++++++++++++++
 drivers/mtd/mtdpart.c                           |  28 +-
 drivers/mtd/mtdswap.c                           |  24 +-
 drivers/mtd/nand/atmel_nand.c                   | 130 ++++-----
 drivers/mtd/nand/bf5xx_nand.c                   |  51 ++--
 drivers/mtd/nand/brcmnand/brcmnand.c            | 262 ++++++++++-------
 drivers/mtd/nand/cafe_nand.c                    |  45 ++-
 drivers/mtd/nand/davinci_nand.c                 | 118 +++-----
 drivers/mtd/nand/denali.c                       |  51 +++-
 drivers/mtd/nand/diskonchip.c                   |  60 +++-
 drivers/mtd/nand/docg4.c                        |  34 ++-
 drivers/mtd/nand/fsl_elbc_nand.c                |  83 +++---
 drivers/mtd/nand/fsl_ifc_nand.c                 | 245 +++++-----------
 drivers/mtd/nand/fsmc_nand.c                    | 322 ++++++---------------
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c          |  61 ++--
 drivers/mtd/nand/hisi504_nand.c                 |  27 +-
 drivers/mtd/nand/jz4740_nand.c                  |   2 +-
 drivers/mtd/nand/jz4780_nand.c                  |  19 +-
 drivers/mtd/nand/lpc32xx_mlc.c                  |  50 ++--
 drivers/mtd/nand/lpc32xx_slc.c                  |  58 +++-
 drivers/mtd/nand/mxc_nand.c                     | 212 +++++++-------
 drivers/mtd/nand/nand_base.c                    | 344 ++++++++++++-----------
 drivers/mtd/nand/nand_bch.c                     |  46 ++-
 drivers/mtd/nand/omap2.c                        | 241 +++++++++-------
 drivers/mtd/nand/pxa3xx_nand.c                  | 104 ++++---
 drivers/mtd/nand/s3c2410.c                      |  32 ++-
 drivers/mtd/nand/sh_flctl.c                     |  87 ++++--
 drivers/mtd/nand/sharpsl.c                      |   2 +-
 drivers/mtd/nand/sm_common.c                    |  93 ++++--
 drivers/mtd/nand/sunxi_nand.c                   | 114 ++++----
 drivers/mtd/nand/vf610_nfc.c                    |  34 +--
 drivers/mtd/onenand/onenand_base.c              | 262 ++++++++---------
 drivers/mtd/tests/oobtest.c                     |  49 ++--
 drivers/staging/mt29f_spinand/mt29f_spinand.c   |  49 ++--
 fs/jffs2/wbuf.c                                 |   6 +-
 include/linux/mtd/fsmc.h                        |  18 --
 include/linux/mtd/mtd.h                         |  69 ++++-
 include/linux/mtd/nand.h                        |   5 +-
 include/linux/mtd/nand_bch.h                    |   8 +-
 include/linux/mtd/onenand.h                     |   2 -
 include/linux/mtd/sharpsl.h                     |   2 +-
 include/uapi/mtd/mtd-abi.h                      |   2 +-
 48 files changed, 2375 insertions(+), 1754 deletions(-)

-- 
2.1.4

[PATCH v3 01/52] mtd: kill the ecclayout->oobavail field

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:58:32 

ecclayout->oobavail is just redundant with the mtd->oobavail field.
Moreover, it prevents static const definition of ecc layouts since the
NAND framework is calculating this value based on the ecclayout->oobfree
field.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/devices/docg3.c                   |  5 ++-
 drivers/mtd/mtdswap.c                         | 16 ++++-----
 drivers/mtd/nand/brcmnand/brcmnand.c          |  8 ++---
 drivers/mtd/nand/docg4.c                      |  1 -
 drivers/mtd/nand/hisi504_nand.c               |  1 -
 drivers/mtd/nand/nand_base.c                  | 14 ++++----
 drivers/mtd/onenand/onenand_base.c            | 16 ++++-----
 drivers/mtd/tests/oobtest.c                   | 49 +++++++++++++--------------
 drivers/staging/mt29f_spinand/mt29f_spinand.c |  1 -
 fs/jffs2/wbuf.c                               |  6 ++--
 include/linux/mtd/mtd.h                       |  1 -
 11 files changed, 53 insertions(+), 65 deletions(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index c3a2695..e7b2e43 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -72,13 +72,11 @@ MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, "
  * @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC)
  * @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC)
  * @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15
- * @oobavail: 8 available bytes remaining after ECC toll
  */
 static struct nand_ecclayout docg3_oobinfo = {
 	.eccbytes = 8,
 	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14},
 	.oobfree = {{0, 7}, {15, 1} },
-	.oobavail = 8,
 };
 
 static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
@@ -1438,7 +1436,7 @@ static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
 		oobdelta = mtd->oobsize;
 		break;
 	case MTD_OPS_AUTO_OOB:
-		oobdelta = mtd->ecclayout->oobavail;
+		oobdelta = mtd->oobavail;
 		break;
 	default:
 		return -EINVAL;
@@ -1860,6 +1858,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
 	mtd->ecclayout = &docg3_oobinfo;
+	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
 	return 0;
diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
index fc8b3d1..d330eb1 100644
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -346,7 +346,7 @@ static int mtdswap_read_markers(struct mtdswap_dev *d, struct swap_eb *eb)
 	if (mtd_can_have_bb(d->mtd) && mtd_block_isbad(d->mtd, offset))
 		return MTDSWAP_SCANNED_BAD;
 
-	ops.ooblen = 2 * d->mtd->ecclayout->oobavail;
+	ops.ooblen = 2 * d->mtd->oobavail;
 	ops.oobbuf = d->oob_buf;
 	ops.ooboffs = 0;
 	ops.datbuf = NULL;
@@ -359,7 +359,7 @@ static int mtdswap_read_markers(struct mtdswap_dev *d, struct swap_eb *eb)
 
 	data = (struct mtdswap_oobdata *)d->oob_buf;
 	data2 = (struct mtdswap_oobdata *)
-		(d->oob_buf + d->mtd->ecclayout->oobavail);
+		(d->oob_buf + d->mtd->oobavail);
 
 	if (le16_to_cpu(data->magic) == MTDSWAP_MAGIC_CLEAN) {
 		eb->erase_count = le32_to_cpu(data->count);
@@ -933,7 +933,7 @@ static unsigned int mtdswap_eblk_passes(struct mtdswap_dev *d,
 
 	ops.mode = MTD_OPS_AUTO_OOB;
 	ops.len = mtd->writesize;
-	ops.ooblen = mtd->ecclayout->oobavail;
+	ops.ooblen = mtd->oobavail;
 	ops.ooboffs = 0;
 	ops.datbuf = d->page_buf;
 	ops.oobbuf = d->oob_buf;
@@ -945,7 +945,7 @@ static unsigned int mtdswap_eblk_passes(struct mtdswap_dev *d,
 		for (i = 0; i < mtd_pages; i++) {
 			patt = mtdswap_test_patt(test + i);
 			memset(d->page_buf, patt, mtd->writesize);
-			memset(d->oob_buf, patt, mtd->ecclayout->oobavail);
+			memset(d->oob_buf, patt, mtd->oobavail);
 			ret = mtd_write_oob(mtd, pos, &ops);
 			if (ret)
 				goto error;
@@ -964,7 +964,7 @@ static unsigned int mtdswap_eblk_passes(struct mtdswap_dev *d,
 				if (p1[j] != patt)
 					goto error;
 
-			for (j = 0; j < mtd->ecclayout->oobavail; j++)
+			for (j = 0; j < mtd->oobavail; j++)
 				if (p2[j] != (unsigned char)patt)
 					goto error;
 
@@ -1387,7 +1387,7 @@ static int mtdswap_init(struct mtdswap_dev *d, unsigned int eblocks,
 	if (!d->page_buf)
 		goto page_buf_fail;
 
-	d->oob_buf = kmalloc(2 * mtd->ecclayout->oobavail, GFP_KERNEL);
+	d->oob_buf = kmalloc(2 * mtd->oobavail, GFP_KERNEL);
 	if (!d->oob_buf)
 		goto oob_buf_fail;
 
@@ -1454,10 +1454,10 @@ static void mtdswap_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
 		return;
 	}
 
-	if (!mtd->oobsize || oinfo->oobavail < MTDSWAP_OOBSIZE) {
+	if (!mtd->oobsize || mtd->oobavail < MTDSWAP_OOBSIZE) {
 		printk(KERN_ERR "%s: Not enough free bytes in OOB, "
 			"%d available, %zu needed.\n",
-			MTDSWAP_PREFIX, oinfo->oobavail, MTDSWAP_OOBSIZE);
+			MTDSWAP_PREFIX, mtd->oobavail, MTDSWAP_OOBSIZE);
 		return;
 	}
 
diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index f7009c1..e052839 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -828,7 +828,8 @@ static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
 				    idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
 				break;
 		}
-		goto out;
+
+		return layout;
 	}
 
 	/*
@@ -879,10 +880,7 @@ static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
 				idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
 			break;
 	}
-out:
-	/* Sum available OOB */
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE; i++)
-		layout->oobavail += layout->oobfree[i].length;
+
 	return layout;
 }
 
diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index df4165b..fb46fd7 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -225,7 +225,6 @@ struct docg4_priv {
 static struct nand_ecclayout docg4_oobinfo = {
 	.eccbytes = 9,
 	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
-	.oobavail = 5,
 	.oobfree = { {.offset = 2, .length = 5} }
 };
 
diff --git a/drivers/mtd/nand/hisi504_nand.c b/drivers/mtd/nand/hisi504_nand.c
index f8d37f3..96502b6 100644
--- a/drivers/mtd/nand/hisi504_nand.c
+++ b/drivers/mtd/nand/hisi504_nand.c
@@ -632,7 +632,6 @@ static void hisi_nfc_host_init(struct hinfc_host *host)
 }
 
 static struct nand_ecclayout nand_ecc_2K_16bits = {
-	.oobavail = 6,
 	.oobfree = { {2, 6} },
 };
 
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index f2c8ff3..9f49d3e 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2076,7 +2076,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 	stats = mtd->ecc_stats;
 
 	if (ops->mode == MTD_OPS_AUTO_OOB)
-		len = chip->ecc.layout->oobavail;
+		len = mtd->oobavail;
 	else
 		len = mtd->oobsize;
 
@@ -2767,7 +2767,7 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
 			 __func__, (unsigned int)to, (int)ops->ooblen);
 
 	if (ops->mode == MTD_OPS_AUTO_OOB)
-		len = chip->ecc.layout->oobavail;
+		len = mtd->oobavail;
 	else
 		len = mtd->oobsize;
 
@@ -4325,11 +4325,11 @@ int nand_scan_tail(struct mtd_info *mtd)
 	 * The number of bytes available for a client to place data into
 	 * the out of band area.
 	 */
-	ecc->layout->oobavail = 0;
-	for (i = 0; ecc->layout->oobfree[i].length
-			&& i < ARRAY_SIZE(ecc->layout->oobfree); i++)
-		ecc->layout->oobavail += ecc->layout->oobfree[i].length;
-	mtd->oobavail = ecc->layout->oobavail;
+	mtd->oobavail = 0;
+	if (ecc->layout) {
+		for (i = 0; ecc->layout->oobfree[i].length; i++)
+			mtd->oobavail += ecc->layout->oobfree[i].length;
+	}
 
 	/* ECC sanity check: warn if it's too weak */
 	if (!nand_ecc_strength_good(mtd))
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 652d018..df47537 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1125,7 +1125,7 @@ static int onenand_mlc_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 			(int)len);
 
 	if (ops->mode == MTD_OPS_AUTO_OOB)
-		oobsize = this->ecclayout->oobavail;
+		oobsize = mtd->oobavail;
 	else
 		oobsize = mtd->oobsize;
 
@@ -1230,7 +1230,7 @@ static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 			(int)len);
 
 	if (ops->mode == MTD_OPS_AUTO_OOB)
-		oobsize = this->ecclayout->oobavail;
+		oobsize = mtd->oobavail;
 	else
 		oobsize = mtd->oobsize;
 
@@ -1365,7 +1365,7 @@ static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
 	ops->oobretlen = 0;
 
 	if (mode == MTD_OPS_AUTO_OOB)
-		oobsize = this->ecclayout->oobavail;
+		oobsize = mtd->oobavail;
 	else
 		oobsize = mtd->oobsize;
 
@@ -1887,7 +1887,7 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
 		return 0;
 
 	if (ops->mode == MTD_OPS_AUTO_OOB)
-		oobsize = this->ecclayout->oobavail;
+		oobsize = mtd->oobavail;
 	else
 		oobsize = mtd->oobsize;
 
@@ -2063,7 +2063,7 @@ static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
 	ops->oobretlen = 0;
 
 	if (mode == MTD_OPS_AUTO_OOB)
-		oobsize = this->ecclayout->oobavail;
+		oobsize = mtd->oobavail;
 	else
 		oobsize = mtd->oobsize;
 
@@ -4050,12 +4050,10 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	 * The number of bytes available for a client to place data into
 	 * the out of band area
 	 */
-	this->ecclayout->oobavail = 0;
+	mtd->oobavail = 0;
 	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
 	    this->ecclayout->oobfree[i].length; i++)
-		this->ecclayout->oobavail +=
-			this->ecclayout->oobfree[i].length;
-	mtd->oobavail = this->ecclayout->oobavail;
+		mtd->oobavail += this->ecclayout->oobfree[i].length;
 
 	mtd->ecclayout = this->ecclayout;
 	mtd->ecc_strength = 1;
diff --git a/drivers/mtd/tests/oobtest.c b/drivers/mtd/tests/oobtest.c
index 3176212..1cb3f77 100644
--- a/drivers/mtd/tests/oobtest.c
+++ b/drivers/mtd/tests/oobtest.c
@@ -215,19 +215,19 @@ static int verify_eraseblock(int ebnum)
 			pr_info("ignoring error as within bitflip_limit\n");
 		}
 
-		if (use_offset != 0 || use_len < mtd->ecclayout->oobavail) {
+		if (use_offset != 0 || use_len < mtd->oobavail) {
 			int k;
 
 			ops.mode      = MTD_OPS_AUTO_OOB;
 			ops.len       = 0;
 			ops.retlen    = 0;
-			ops.ooblen    = mtd->ecclayout->oobavail;
+			ops.ooblen    = mtd->oobavail;
 			ops.oobretlen = 0;
 			ops.ooboffs   = 0;
 			ops.datbuf    = NULL;
 			ops.oobbuf    = readbuf;
 			err = mtd_read_oob(mtd, addr, &ops);
-			if (err || ops.oobretlen != mtd->ecclayout->oobavail) {
+			if (err || ops.oobretlen != mtd->oobavail) {
 				pr_err("error: readoob failed at %#llx\n",
 						(long long)addr);
 				errcnt += 1;
@@ -244,7 +244,7 @@ static int verify_eraseblock(int ebnum)
 			/* verify post-(use_offset + use_len) area for 0xff */
 			k = use_offset + use_len;
 			bitflips += memffshow(addr, k, readbuf + k,
-					      mtd->ecclayout->oobavail - k);
+					      mtd->oobavail - k);
 
 			if (bitflips > bitflip_limit) {
 				pr_err("error: verify failed at %#llx\n",
@@ -269,8 +269,8 @@ static int verify_eraseblock_in_one_go(int ebnum)
 	struct mtd_oob_ops ops;
 	int err = 0;
 	loff_t addr = (loff_t)ebnum * mtd->erasesize;
-	size_t len = mtd->ecclayout->oobavail * pgcnt;
-	size_t oobavail = mtd->ecclayout->oobavail;
+	size_t len = mtd->oobavail * pgcnt;
+	size_t oobavail = mtd->oobavail;
 	size_t bitflips;
 	int i;
 
@@ -394,8 +394,8 @@ static int __init mtd_oobtest_init(void)
 		goto out;
 
 	use_offset = 0;
-	use_len = mtd->ecclayout->oobavail;
-	use_len_max = mtd->ecclayout->oobavail;
+	use_len = mtd->oobavail;
+	use_len_max = mtd->oobavail;
 	vary_offset = 0;
 
 	/* First test: write all OOB, read it back and verify */
@@ -460,8 +460,8 @@ static int __init mtd_oobtest_init(void)
 
 	/* Write all eraseblocks */
 	use_offset = 0;
-	use_len = mtd->ecclayout->oobavail;
-	use_len_max = mtd->ecclayout->oobavail;
+	use_len = mtd->oobavail;
+	use_len_max = mtd->oobavail;
 	vary_offset = 1;
 	prandom_seed_state(&rnd_state, 5);
 
@@ -471,8 +471,8 @@ static int __init mtd_oobtest_init(void)
 
 	/* Check all eraseblocks */
 	use_offset = 0;
-	use_len = mtd->ecclayout->oobavail;
-	use_len_max = mtd->ecclayout->oobavail;
+	use_len = mtd->oobavail;
+	use_len_max = mtd->oobavail;
 	vary_offset = 1;
 	prandom_seed_state(&rnd_state, 5);
 	err = verify_all_eraseblocks();
@@ -480,8 +480,8 @@ static int __init mtd_oobtest_init(void)
 		goto out;
 
 	use_offset = 0;
-	use_len = mtd->ecclayout->oobavail;
-	use_len_max = mtd->ecclayout->oobavail;
+	use_len = mtd->oobavail;
+	use_len_max = mtd->oobavail;
 	vary_offset = 0;
 
 	/* Fourth test: try to write off end of device */
@@ -501,7 +501,7 @@ static int __init mtd_oobtest_init(void)
 	ops.retlen    = 0;
 	ops.ooblen    = 1;
 	ops.oobretlen = 0;
-	ops.ooboffs   = mtd->ecclayout->oobavail;
+	ops.ooboffs   = mtd->oobavail;
 	ops.datbuf    = NULL;
 	ops.oobbuf    = writebuf;
 	pr_info("attempting to start write past end of OOB\n");
@@ -521,7 +521,7 @@ static int __init mtd_oobtest_init(void)
 	ops.retlen    = 0;
 	ops.ooblen    = 1;
 	ops.oobretlen = 0;
-	ops.ooboffs   = mtd->ecclayout->oobavail;
+	ops.ooboffs   = mtd->oobavail;
 	ops.datbuf    = NULL;
 	ops.oobbuf    = readbuf;
 	pr_info("attempting to start read past end of OOB\n");
@@ -543,7 +543,7 @@ static int __init mtd_oobtest_init(void)
 		ops.mode      = MTD_OPS_AUTO_OOB;
 		ops.len       = 0;
 		ops.retlen    = 0;
-		ops.ooblen    = mtd->ecclayout->oobavail + 1;
+		ops.ooblen    = mtd->oobavail + 1;
 		ops.oobretlen = 0;
 		ops.ooboffs   = 0;
 		ops.datbuf    = NULL;
@@ -563,7 +563,7 @@ static int __init mtd_oobtest_init(void)
 		ops.mode      = MTD_OPS_AUTO_OOB;
 		ops.len       = 0;
 		ops.retlen    = 0;
-		ops.ooblen    = mtd->ecclayout->oobavail + 1;
+		ops.ooblen    = mtd->oobavail + 1;
 		ops.oobretlen = 0;
 		ops.ooboffs   = 0;
 		ops.datbuf    = NULL;
@@ -587,7 +587,7 @@ static int __init mtd_oobtest_init(void)
 		ops.mode      = MTD_OPS_AUTO_OOB;
 		ops.len       = 0;
 		ops.retlen    = 0;
-		ops.ooblen    = mtd->ecclayout->oobavail;
+		ops.ooblen    = mtd->oobavail;
 		ops.oobretlen = 0;
 		ops.ooboffs   = 1;
 		ops.datbuf    = NULL;
@@ -607,7 +607,7 @@ static int __init mtd_oobtest_init(void)
 		ops.mode      = MTD_OPS_AUTO_OOB;
 		ops.len       = 0;
 		ops.retlen    = 0;
-		ops.ooblen    = mtd->ecclayout->oobavail;
+		ops.ooblen    = mtd->oobavail;
 		ops.oobretlen = 0;
 		ops.ooboffs   = 1;
 		ops.datbuf    = NULL;
@@ -638,7 +638,7 @@ static int __init mtd_oobtest_init(void)
 	for (i = 0; i < ebcnt - 1; ++i) {
 		int cnt = 2;
 		int pg;
-		size_t sz = mtd->ecclayout->oobavail;
+		size_t sz = mtd->oobavail;
 		if (bbt[i] || bbt[i + 1])
 			continue;
 		addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize;
@@ -673,13 +673,12 @@ static int __init mtd_oobtest_init(void)
 	for (i = 0; i < ebcnt - 1; ++i) {
 		if (bbt[i] || bbt[i + 1])
 			continue;
-		prandom_bytes_state(&rnd_state, writebuf,
-					mtd->ecclayout->oobavail * 2);
+		prandom_bytes_state(&rnd_state, writebuf, mtd->oobavail * 2);
 		addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize;
 		ops.mode      = MTD_OPS_AUTO_OOB;
 		ops.len       = 0;
 		ops.retlen    = 0;
-		ops.ooblen    = mtd->ecclayout->oobavail * 2;
+		ops.ooblen    = mtd->oobavail * 2;
 		ops.oobretlen = 0;
 		ops.ooboffs   = 0;
 		ops.datbuf    = NULL;
@@ -688,7 +687,7 @@ static int __init mtd_oobtest_init(void)
 		if (err)
 			goto out;
 		if (memcmpshow(addr, readbuf, writebuf,
-			       mtd->ecclayout->oobavail * 2)) {
+			       mtd->oobavail * 2)) {
 			pr_err("error: verify failed at %#llx\n",
 			       (long long)addr);
 			errcnt += 1;
diff --git a/drivers/staging/mt29f_spinand/mt29f_spinand.c b/drivers/staging/mt29f_spinand/mt29f_spinand.c
index 197d112..6728376 100644
--- a/drivers/staging/mt29f_spinand/mt29f_spinand.c
+++ b/drivers/staging/mt29f_spinand/mt29f_spinand.c
@@ -49,7 +49,6 @@ static struct nand_ecclayout spinand_oob_64 = {
 		17, 18, 19, 20, 21, 22,
 		33, 34, 35, 36, 37, 38,
 		49, 50, 51, 52, 53, 54, },
-	.oobavail = 32,
 	.oobfree = {
 		{.offset = 8,
 			.length = 8},
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 5a3da3f..b25d28a 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -1183,22 +1183,20 @@ void jffs2_dirty_trigger(struct jffs2_sb_info *c)
 
 int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
 {
-	struct nand_ecclayout *oinfo = c->mtd->ecclayout;
-
 	if (!c->mtd->oobsize)
 		return 0;
 
 	/* Cleanmarker is out-of-band, so inline size zero */
 	c->cleanmarker_size = 0;
 
-	if (!oinfo || oinfo->oobavail == 0) {
+	if (c->mtd->oobavail == 0) {
 		pr_err("inconsistent device description\n");
 		return -EINVAL;
 	}
 
 	jffs2_dbg(1, "using OOB on NAND\n");
 
-	c->oobavail = oinfo->oobavail;
+	c->oobavail = c->mtd->oobavail;
 
 	/* Initialise write buffer */
 	init_rwsem(&c->wbuf_sem);
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index cc84923..9cf13c4 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -105,7 +105,6 @@ struct mtd_oob_ops {
 struct nand_ecclayout {
 	__u32 eccbytes;
 	__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
-	__u32 oobavail;
 	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 };
 
-- 
2.1.4

[PATCH v3 02/52] mtd: create an mtd_oobavail() helper and make use of it

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:58:37 

Currently, all MTD drivers/sublayers exposing an OOB area are
doing the same kind of test to extract the available OOB size
based on the mtd_info and mtd_oob_ops structures.
Move this common logic into an inline function and make use of it.

Signed-off-by: Boris Brezillon <redacted>
Suggested-by: Priit Laes <redacted>
---
 drivers/mtd/mtdpart.c              |  5 +----
 drivers/mtd/nand/nand_base.c       | 16 ++++------------
 drivers/mtd/onenand/onenand_base.c | 19 +++----------------
 include/linux/mtd/mtd.h            |  5 +++++
 4 files changed, 13 insertions(+), 32 deletions(-)

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 10bf304..08de4b2 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -126,10 +126,7 @@ static int part_read_oob(struct mtd_info *mtd, loff_t from,
 	if (ops->oobbuf) {
 		size_t len, pages;
 
-		if (ops->mode == MTD_OPS_AUTO_OOB)
-			len = mtd->oobavail;
-		else
-			len = mtd->oobsize;
+		len = mtd_oobavail(mtd, ops);
 		pages = mtd_div_by_ws(mtd->size, mtd);
 		pages -= mtd_div_by_ws(from, mtd);
 		if (ops->ooboffs + ops->ooblen > pages * len)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 9f49d3e..ee89195 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1723,8 +1723,7 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
 	int ret = 0;
 	uint32_t readlen = ops->len;
 	uint32_t oobreadlen = ops->ooblen;
-	uint32_t max_oobsize = ops->mode == MTD_OPS_AUTO_OOB ?
-		mtd->oobavail : mtd->oobsize;
+	uint32_t max_oobsize = mtd_oobavail(mtd, ops);
 
 	uint8_t *bufpoi, *oob, *buf;
 	int use_bufpoi;
@@ -2075,10 +2074,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 
 	stats = mtd->ecc_stats;
 
-	if (ops->mode == MTD_OPS_AUTO_OOB)
-		len = mtd->oobavail;
-	else
-		len = mtd->oobsize;
+	len = mtd_oobavail(mtd, ops);
 
 	if (unlikely(ops->ooboffs >= len)) {
 		pr_debug("%s: attempt to start read outside oob\n",
@@ -2575,8 +2571,7 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
 	uint32_t writelen = ops->len;
 
 	uint32_t oobwritelen = ops->ooblen;
-	uint32_t oobmaxlen = ops->mode == MTD_OPS_AUTO_OOB ?
-				mtd->oobavail : mtd->oobsize;
+	uint32_t oobmaxlen = mtd_oobavail(mtd, ops);
 
 	uint8_t *oob = ops->oobbuf;
 	uint8_t *buf = ops->datbuf;
@@ -2766,10 +2761,7 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
 	pr_debug("%s: to = 0x%08x, len = %i\n",
 			 __func__, (unsigned int)to, (int)ops->ooblen);
 
-	if (ops->mode == MTD_OPS_AUTO_OOB)
-		len = mtd->oobavail;
-	else
-		len = mtd->oobsize;
+	len = mtd_oobavail(mtd, ops);
 
 	/* Do not allow write past end of page */
 	if ((ops->ooboffs + ops->ooblen) > len) {
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index df47537..af28bb3 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1124,11 +1124,7 @@ static int onenand_mlc_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 	pr_debug("%s: from = 0x%08x, len = %i\n", __func__, (unsigned int)from,
 			(int)len);
 
-	if (ops->mode == MTD_OPS_AUTO_OOB)
-		oobsize = mtd->oobavail;
-	else
-		oobsize = mtd->oobsize;
-
+	oobsize = mtd_oobavail(mtd, ops);
 	oobcolumn = from & (mtd->oobsize - 1);
 
 	/* Do not allow reads past end of device */
@@ -1229,11 +1225,7 @@ static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 	pr_debug("%s: from = 0x%08x, len = %i\n", __func__, (unsigned int)from,
 			(int)len);
 
-	if (ops->mode == MTD_OPS_AUTO_OOB)
-		oobsize = mtd->oobavail;
-	else
-		oobsize = mtd->oobsize;
-
+	oobsize = mtd_oobavail(mtd, ops);
 	oobcolumn = from & (mtd->oobsize - 1);
 
 	/* Do not allow reads past end of device */
@@ -1885,12 +1877,7 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
 	/* Check zero length */
 	if (!len)
 		return 0;
-
-	if (ops->mode == MTD_OPS_AUTO_OOB)
-		oobsize = mtd->oobavail;
-	else
-		oobsize = mtd->oobsize;
-
+	oobsize = mtd_oobavail(mtd, ops);
 	oobcolumn = to & (mtd->oobsize - 1);
 
 	column = to & (mtd->writesize - 1);
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 9cf13c4..7712721 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -264,6 +264,11 @@ static inline struct device_node *mtd_get_of_node(struct mtd_info *mtd)
 	return mtd->dev.of_node;
 }
 
+static inline int mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
+{
+	return ops->mode == MTD_OPS_AUTO_OOB ? mtd->oobavail : mtd->oobsize;
+}
+
 int mtd_erase(struct mtd_info *mtd, struct erase_info *instr);
 int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
 	      void **virt, resource_size_t *phys);
-- 
2.1.4

[PATCH v3 03/52] mtd: mtdswap: remove useless if (!mtd->ecclayout) test

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:58:44 

If the MTD device does not have OOB, the mtd->oobsize and mtd->oobavail
fields are set to zero, and we are testing those values in the following
test.
Remove the useless if (!mtd->ecclayout) test.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/mtdswap.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
index d330eb1..cb06bdd 100644
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -1417,7 +1417,6 @@ static void mtdswap_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
 	unsigned long part;
 	unsigned int eblocks, eavailable, bad_blocks, spare_cnt;
 	uint64_t swap_size, use_size, size_limit;
-	struct nand_ecclayout *oinfo;
 	int ret;
 
 	parts = &partitions[0];
@@ -1447,13 +1446,6 @@ static void mtdswap_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
 		return;
 	}
 
-	oinfo = mtd->ecclayout;
-	if (!oinfo) {
-		printk(KERN_ERR "%s: mtd%d does not have OOB\n",
-			MTDSWAP_PREFIX, mtd->index);
-		return;
-	}
-
 	if (!mtd->oobsize || mtd->oobavail < MTDSWAP_OOBSIZE) {
 		printk(KERN_ERR "%s: Not enough free bytes in OOB, "
 			"%d available, %zu needed.\n",
-- 
2.1.4

[PATCH v3 04/52] mtd: nand: simplify nand_bch_init() usage

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:58:52 

nand_bch_init() requires several arguments which could directly be deduced
from the mtd device. Get rid of those useless parameters.

nand_bch_init() is also requiring the caller to provide a proper eccbytes
value, while this value could be deduced from the ecc.size and
ecc.strength value. Fallback to eccbytes calculation when it is set to 0.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/nand_base.c |  6 ++----
 drivers/mtd/nand/nand_bch.c  | 27 +++++++++++++++++----------
 drivers/mtd/nand/omap2.c     | 28 ++++++++++++----------------
 include/linux/mtd/nand_bch.h |  8 ++------
 4 files changed, 33 insertions(+), 36 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index ee89195..91672bf 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4279,10 +4279,8 @@ int nand_scan_tail(struct mtd_info *mtd)
 		}
 
 		/* See nand_bch_init() for details. */
-		ecc->bytes = DIV_ROUND_UP(
-				ecc->strength * fls(8 * ecc->size), 8);
-		ecc->priv = nand_bch_init(mtd, ecc->size, ecc->bytes,
-					       &ecc->layout);
+		ecc->bytes = 0;
+		ecc->priv = nand_bch_init(mtd);
 		if (!ecc->priv) {
 			pr_warn("BCH ECC initialization failed!\n");
 			BUG();
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index a87c1b6..b585bae 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -107,9 +107,6 @@ EXPORT_SYMBOL(nand_bch_correct_data);
 /**
  * nand_bch_init - [NAND Interface] Initialize NAND BCH error correction
  * @mtd:	MTD block structure
- * @eccsize:	ecc block size in bytes
- * @eccbytes:	ecc length in bytes
- * @ecclayout:	output default layout
  *
  * Returns:
  *  a pointer to a new NAND BCH control structure, or NULL upon failure
@@ -123,14 +120,21 @@ EXPORT_SYMBOL(nand_bch_correct_data);
  * @eccsize = 512  (thus, m=13 is the smallest integer such that 2^m-1 > 512*8)
  * @eccbytes = 7   (7 bytes are required to store m*t = 13*4 = 52 bits)
  */
-struct nand_bch_control *
-nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes,
-	      struct nand_ecclayout **ecclayout)
+struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 {
+	struct nand_chip *nand = mtd_to_nand(mtd);
 	unsigned int m, t, eccsteps, i;
-	struct nand_ecclayout *layout;
+	struct nand_ecclayout *layout = nand->ecc.layout;
 	struct nand_bch_control *nbc = NULL;
 	unsigned char *erased_page;
+	unsigned int eccsize = nand->ecc.size;
+	unsigned int eccbytes = nand->ecc.bytes;
+	unsigned int eccstrength = nand->ecc.strength;
+
+	if (!eccbytes && eccstrength) {
+		eccbytes = DIV_ROUND_UP(eccstrength * fls(8 * eccsize), 8);
+		nand->ecc.bytes = eccbytes;
+	}
 
 	if (!eccsize || !eccbytes) {
 		printk(KERN_WARNING "ecc parameters not supplied\n");
@@ -158,7 +162,7 @@ nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes,
 	eccsteps = mtd->writesize/eccsize;
 
 	/* if no ecc placement scheme was provided, build one */
-	if (!*ecclayout) {
+	if (!layout) {
 
 		/* handle large page devices only */
 		if (mtd->oobsize < 64) {
@@ -184,7 +188,7 @@ nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes,
 		layout->oobfree[0].offset = 2;
 		layout->oobfree[0].length = mtd->oobsize-2-layout->eccbytes;
 
-		*ecclayout = layout;
+		nand->ecc.layout = layout;
 	}
 
 	/* sanity checks */
@@ -192,7 +196,7 @@ nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes,
 		printk(KERN_WARNING "eccsize %u is too large\n", eccsize);
 		goto fail;
 	}
-	if ((*ecclayout)->eccbytes != (eccsteps*eccbytes)) {
+	if (layout->eccbytes != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;
 	}
@@ -216,6 +220,9 @@ nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes,
 	for (i = 0; i < eccbytes; i++)
 		nbc->eccmask[i] ^= 0xff;
 
+	if (!eccstrength)
+		nand->ecc.strength = (eccbytes * 8) / fls(8 * eccsize);
+
 	return nbc;
 fail:
 	nand_bch_free(nbc);
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index c553f78..0749ca1 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1807,13 +1807,19 @@ static int omap_nand_probe(struct platform_device *pdev)
 		goto return_error;
 	}
 
+	/*
+	 * Bail out earlier to let NAND_ECC_SOFT code create its own
+	 * ecclayout instead of using ours.
+	 */
+	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
+		nand_chip->ecc.mode = NAND_ECC_SOFT;
+		goto scan_tail;
+	}
+
 	/* populate MTD interface based on ECC scheme */
 	ecclayout		= &info->oobinfo;
+	nand_chip->ecc.layout	= ecclayout;
 	switch (info->ecc_opt) {
-	case OMAP_ECC_HAM1_CODE_SW:
-		nand_chip->ecc.mode = NAND_ECC_SOFT;
-		break;
-
 	case OMAP_ECC_HAM1_CODE_HW:
 		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
 		nand_chip->ecc.mode             = NAND_ECC_HW;
@@ -1861,10 +1867,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 		ecclayout->oobfree->offset	= 1 +
 				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		/* software bch library is used for locating errors */
-		nand_chip->ecc.priv		= nand_bch_init(mtd,
-							nand_chip->ecc.size,
-							nand_chip->ecc.bytes,
-							&ecclayout);
+		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
 			dev_err(&info->pdev->dev, "unable to use BCH library\n");
 			err = -EINVAL;
@@ -1925,10 +1928,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 		ecclayout->oobfree->offset	= 1 +
 				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		/* software bch library is used for locating errors */
-		nand_chip->ecc.priv		= nand_bch_init(mtd,
-							nand_chip->ecc.size,
-							nand_chip->ecc.bytes,
-							&ecclayout);
+		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
 			dev_err(&info->pdev->dev, "unable to use BCH library\n");
 			err = -EINVAL;
@@ -2002,9 +2002,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		goto return_error;
 	}
 
-	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW)
-		goto scan_tail;
-
 	/* all OOB bytes from oobfree->offset till end off OOB are free */
 	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
 	/* check if NAND device's OOB is enough to store ECC signatures */
@@ -2015,7 +2012,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		err = -EINVAL;
 		goto return_error;
 	}
-	nand_chip->ecc.layout = ecclayout;
 
 scan_tail:
 	/* second phase scan */
diff --git a/include/linux/mtd/nand_bch.h b/include/linux/mtd/nand_bch.h
index fb0bc34..98f20ef 100644
--- a/include/linux/mtd/nand_bch.h
+++ b/include/linux/mtd/nand_bch.h
@@ -32,9 +32,7 @@ int nand_bch_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc,
 /*
  * Initialize BCH encoder/decoder
  */
-struct nand_bch_control *
-nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
-	      unsigned int eccbytes, struct nand_ecclayout **ecclayout);
+struct nand_bch_control *nand_bch_init(struct mtd_info *mtd);
 /*
  * Release BCH encoder/decoder resources
  */
@@ -58,9 +56,7 @@ nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf,
 	return -ENOTSUPP;
 }
 
-static inline struct nand_bch_control *
-nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
-	      unsigned int eccbytes, struct nand_ecclayout **ecclayout)
+static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 {
 	return NULL;
 }
-- 
2.1.4

[PATCH v3 05/52] mtd: add mtd_ooblayout_xxx() helper functions

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:59:02 

In order to make the ecclayout definition completely dynamic we need to
rework the way the OOB layout are defined and iterated.

Create a few mtd_ooblayout_xxx() helpers to ease OOB bytes manipulation
and hide ecclayout internals to their users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/mtdcore.c   | 398 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mtd/mtd.h |  33 ++++
 2 files changed, 431 insertions(+)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 3096251..ab3a7b6 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -997,6 +997,404 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
 }
 EXPORT_SYMBOL_GPL(mtd_read_oob);
 
+/**
+ * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section
+ * @mtd: MTD device structure
+ * @section: ECC section. Depending on the layout you may have all the ECC
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobecc: OOB region struct filled with the appropriate ECC position
+ *	    information
+ *
+ * This functions return ECC section information in the OOB area. I you want
+ * to get all the ECC bytes information, then you should call
+ * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
+		      struct mtd_oob_region *oobecc)
+{
+	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
+
+	memset(oobecc, 0, sizeof(*oobecc));
+
+	if (!mtd || section < 0)
+		return -EINVAL;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	/*
+	 * This logic allows us to reuse the ->ecclayout information and
+	 * expose them as ECC regions (as done for the OOB free regions).
+	 *
+	 * TODO: this should be dropped as soon as we get rid of the
+	 * ->ecclayout field.
+	 */
+	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
+		eccpos = mtd->ecclayout->eccpos[eccbyte];
+
+		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
+			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
+
+			if (eccpos + 1 == neccpos) {
+				length++;
+				continue;
+			}
+		}
+
+		if (section == cursection)
+			break;
+
+		length = 0;
+		cursection++;
+	}
+
+	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	oobecc->length = length + 1;
+	oobecc->offset = eccpos - length;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
+
+/**
+ * mtd_ooblayout_free - Get the OOB region definition of a specific free
+ *			section
+ * @mtd: MTD device structure
+ * @section: Free section you are interested in. Depending on the layout
+ *	     you may have all the free bytes stored in a single contiguous
+ *	     section, or one section per ECC chunk plus an extra section
+ *	     for the remaining bytes (or other funky layout).
+ * @oobfree: OOB region struct filled with the appropriate free position
+ *	     information
+ *
+ * This functions return free bytes position in the OOB area. I you want
+ * to get all the free bytes information, then you should call
+ * mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_free(struct mtd_info *mtd, int section,
+		       struct mtd_oob_region *oobfree)
+{
+	memset(oobfree, 0, sizeof(*oobfree));
+
+	if (!mtd || section < 0)
+		return -EINVAL;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
+		return -ERANGE;
+
+	oobfree->offset = mtd->ecclayout->oobfree[section].offset;
+	oobfree->length = mtd->ecclayout->oobfree[section].length;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
+
+/**
+ * mtd_ooblayout_find_region - Find the region attached to a specific byte
+ * @mtd: mtd info structure
+ * @byte: the byte we are searching for
+ * @sectionp: pointer where the section id will be stored
+ * @oobregion: used to retrieve the ECC position
+ * @iter: iterator function. Should be either mtd_ooblayout_free or
+ *	  mtd_ooblayout_ecc depending on the region type you're searching for
+ *
+ * This functions returns the section id and oobregion information of a
+ * specific byte. For example, say you want to know where the 4th ECC byte is
+ * stored, you'll use:
+ *
+ * mtd_ooblayout_find_region(mtd, 3, &section, &oobregion, mtd_ooblayout_ecc);
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte,
+				int *sectionp, struct mtd_oob_region *oobregion,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	int pos = 0, ret, section = 0;
+
+	memset(oobregion, 0, sizeof(*oobregion));
+
+	while (pos + oobregion->length <= byte) {
+		ret = iter(mtd, section++, oobregion);
+		if (ret)
+			return ret;
+
+		pos += oobregion->length;
+	}
+
+	/*
+	 * Adjust region info to make it start at the beginning at the
+	 * 'start' ECC byte.
+	 */
+	oobregion->offset += byte - pos;
+	oobregion->length -= byte - pos;
+	*sectionp = section;
+
+	return 0;
+}
+
+/**
+ * mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific
+ *				  ECC byte
+ * @mtd: mtd info structure
+ * @eccbyte: the byte we are searching for
+ * @sectionp: pointer where the section id will be stored
+ * @oobregion: OOB region information
+ *
+ * Works like mtd_ooblayout_find_region() except it searches for a specific ECC
+ * byte.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
+				 int *section,
+				 struct mtd_oob_region *oobregion)
+{
+	return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion,
+					 mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion);
+
+/**
+ * mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @buf: destination buffer to store OOB bytes
+ * @oobbuf: OOB buffer
+ * @start: first byte to retrieve
+ * @nbytes: number of bytes to retrieve
+ * @iter: section iterator
+ *
+ * Extract bytes attached to a specific category (ECC or free)
+ * from the OOB buffer and copy them into buf.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf,
+				const u8 *oobbuf, int start, int nbytes,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret;
+
+	ret = mtd_ooblayout_find_region(mtd, start, &section,
+					&oobregion, iter);
+	if (ret)
+		return ret;
+
+	while (nbytes) {
+		int cnt;
+
+		ret = iter(mtd, section++, &oobregion);
+		if (ret)
+			return ret;
+
+		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		memcpy(buf, oobbuf + oobregion.offset, cnt);
+		buf += cnt;
+		nbytes -= cnt;
+	}
+
+	return !nbytes ? 0 : -ERANGE;
+}
+
+/**
+ * mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @buf: source buffer to get OOB bytes from
+ * @oobbuf: OOB buffer
+ * @start: first OOB byte to set
+ * @nbytes: number of OOB bytes to set
+ * @iter: section iterator
+ *
+ * Fill the OOB buffer with data provided in buf. The category (ECC or free)
+ * is selected by passing the appropriate iterator.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf,
+				u8 *oobbuf, int start, int nbytes,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret;
+
+	ret = mtd_ooblayout_find_region(mtd, start, &section,
+					&oobregion, iter);
+	if (ret)
+		return ret;
+
+	while (nbytes) {
+		int cnt;
+
+		ret = iter(mtd, section++, &oobregion);
+		if (ret)
+			return ret;
+
+		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		memcpy(oobbuf + oobregion.offset, buf, cnt);
+		buf += cnt;
+		nbytes -= cnt;
+	}
+
+	return !nbytes ? 0 : -ERANGE;
+}
+
+/**
+ * mtd_ooblayout_count_bytes - count the number of bytes in a OOB category
+ * @mtd: mtd info structure
+ * @iter: category iterator
+ *
+ * Count the number of bytes in a given category.
+ *
+ * Returns a positive value on success, a negative error code otherwise.
+ */
+static int mtd_ooblayout_count_bytes(struct mtd_info *mtd,
+				int (*iter)(struct mtd_info *,
+					    int section,
+					    struct mtd_oob_region *oobregion))
+{
+	struct mtd_oob_region oobregion = { };
+	int section = 0, ret, nbytes = 0;
+
+	while (1) {
+		ret = iter(mtd, section++, &oobregion);
+		if (ret) {
+			if (ret == -ERANGE)
+				ret = nbytes;
+			break;
+		}
+
+		nbytes += oobregion.length;
+	}
+
+	return ret;
+}
+
+/**
+ * mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: destination buffer to store ECC bytes
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to retrieve
+ * @nbytes: number of ECC bytes to retrieve
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
+			       const u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes);
+
+/**
+ * mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: source buffer to get ECC bytes from
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to set
+ * @nbytes: number of ECC bytes to set
+ *
+ * Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
+			       u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes);
+
+/**
+ * mtd_ooblayout_get_databytes - extract data bytes from the oob buffer
+ * @mtd: mtd info structure
+ * @databuf: destination buffer to store ECC bytes
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to retrieve
+ * @nbytes: number of ECC bytes to retrieve
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
+				const u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes);
+
+/**
+ * mtd_ooblayout_get_eccbytes - set data bytes into the oob buffer
+ * @mtd: mtd info structure
+ * @eccbuf: source buffer to get data bytes from
+ * @oobbuf: OOB buffer
+ * @start: first ECC byte to set
+ * @nbytes: number of ECC bytes to set
+ *
+ * Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
+				u8 *oobbuf, int start, int nbytes)
+{
+	return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes,
+				       mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes);
+
+/**
+ * mtd_ooblayout_count_freebytes - count the number of free bytes in OOB
+ * @mtd: mtd info structure
+ *
+ * Works like mtd_ooblayout_count_bytes(), except it count free bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_count_freebytes(struct mtd_info *mtd)
+{
+	return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes);
+
+/**
+ * mtd_ooblayout_count_freebytes - count the number of ECC bytes in OOB
+ * @mtd: mtd info structure
+ *
+ * Works like mtd_ooblayout_count_bytes(), except it count ECC bytes.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
+{
+	return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc);
+}
+EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
+
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 7712721..b141f26 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -108,6 +108,21 @@ struct nand_ecclayout {
 	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 };
 
+/**
+ * struct mtd_oob_region - oob region definition
+ * @offset: region offset
+ * @length: region length
+ *
+ * This structure describes a region of the OOB area, and is used
+ * to retrieve ECC or free bytes sections.
+ * Each section is defined by an offset within the OOB area and a
+ * length.
+ */
+struct mtd_oob_region {
+	u32 offset;
+	u32 length;
+};
+
 struct module;	/* only needed for owner field in mtd_info */
 
 struct mtd_info {
@@ -253,6 +268,24 @@ struct mtd_info {
 	int usecount;
 };
 
+int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
+		      struct mtd_oob_region *oobecc);
+int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
+				 int *section,
+				 struct mtd_oob_region *oobregion);
+int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
+			       const u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
+			       u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_free(struct mtd_info *mtd, int section,
+		       struct mtd_oob_region *oobfree);
+int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
+				const u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
+				u8 *oobbuf, int start, int nbytes);
+int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
+int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.1.4

[PATCH v3 07/52] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:59:13 

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/nand_base.c | 183 +++++++++++++++++++------------------------
 drivers/mtd/nand/nand_bch.c  |   3 +-
 2 files changed, 82 insertions(+), 104 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 91672bf..17504f2 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1309,13 +1309,12 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
 static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 				uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
 
 	chip->ecc.read_page_raw(mtd, chip, buf, 1, page);
@@ -1323,8 +1322,10 @@ static int nand_read_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	eccsteps = chip->ecc.steps;
 	p = buf;
@@ -1356,14 +1357,14 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 			uint32_t data_offs, uint32_t readlen, uint8_t *bufpoi,
 			int page)
 {
-	int start_step, end_step, num_steps;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
+	int start_step, end_step, num_steps, ret;
 	uint8_t *p;
 	int data_col_addr, i, gaps = 0;
 	int datafrag_len, eccfrag_len, aligned_len, aligned_pos;
 	int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1;
-	int index;
+	int index, section = 0;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = { };
 
 	/* Column address within the page aligned to ECC size (256bytes) */
 	start_step = data_offs / chip->ecc.size;
@@ -1391,12 +1392,13 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 	 * The performance is faster if we position offsets according to
 	 * ecc.pos. Let's make sure that there are no gaps in ECC positions.
 	 */
-	for (i = 0; i < eccfrag_len - 1; i++) {
-		if (eccpos[i + index] + 1 != eccpos[i + index + 1]) {
-			gaps = 1;
-			break;
-		}
-	}
+	ret = mtd_ooblayout_find_eccregion(mtd, index, &section, &oobregion);
+	if (ret)
+		return ret;
+
+	if (oobregion.length < eccfrag_len)
+		gaps = 1;
+
 	if (gaps) {
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
 		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1405,20 +1407,23 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 		 * Send the command to read the particular ECC bytes take care
 		 * about buswidth alignment in read_buf.
 		 */
-		aligned_pos = eccpos[index] & ~(busw - 1);
+		aligned_pos = oobregion.offset & ~(busw - 1);
 		aligned_len = eccfrag_len;
-		if (eccpos[index] & (busw - 1))
+		if (oobregion.offset & (busw - 1))
 			aligned_len++;
-		if (eccpos[index + (num_steps * chip->ecc.bytes)] & (busw - 1))
+		if ((oobregion.offset + (num_steps * chip->ecc.bytes)) &
+		    (busw - 1))
 			aligned_len++;
 
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-					mtd->writesize + aligned_pos, -1);
+			      mtd->writesize + aligned_pos, -1);
 		chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len);
 	}
 
-	for (i = 0; i < eccfrag_len; i++)
-		chip->buffers->ecccode[i] = chip->oob_poi[eccpos[i + index]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, chip->buffers->ecccode,
+					 chip->oob_poi, index, eccfrag_len);
+	if (ret)
+		return ret;
 
 	p = bufpoi + data_col_addr;
 	for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size) {
@@ -1459,13 +1464,12 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
@@ -1475,8 +1479,10 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	}
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	eccsteps = chip->ecc.steps;
 	p = buf;
@@ -1521,12 +1527,11 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *p = buf;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	unsigned int max_bitflips = 0;
 
@@ -1535,8 +1540,10 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		ecc_code[i] = chip->oob_poi[eccpos[i]];
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		int stat;
@@ -1637,14 +1644,17 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 
 /**
  * nand_transfer_oob - [INTERN] Transfer oob to client buffer
- * @chip: nand chip structure
+ * @mtd: mtd info structure
  * @oob: oob destination address
  * @ops: oob ops structure
  * @len: size of oob to transfer
  */
-static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
+static uint8_t *nand_transfer_oob(struct mtd_info *mtd, uint8_t *oob,
 				  struct mtd_oob_ops *ops, size_t len)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int ret;
+
 	switch (ops->mode) {
 
 	case MTD_OPS_PLACE_OOB:
@@ -1652,31 +1662,12 @@ static uint8_t *nand_transfer_oob(struct nand_chip *chip, uint8_t *oob,
 		memcpy(oob, chip->oob_poi + ops->ooboffs, len);
 		return oob + len;
 
-	case MTD_OPS_AUTO_OOB: {
-		struct nand_oobfree *free = chip->ecc.layout->oobfree;
-		uint32_t boffs = 0, roffs = ops->ooboffs;
-		size_t bytes = 0;
-
-		for (; free->length && len; free++, len -= bytes) {
-			/* Read request not from offset 0? */
-			if (unlikely(roffs)) {
-				if (roffs >= free->length) {
-					roffs -= free->length;
-					continue;
-				}
-				boffs = free->offset + roffs;
-				bytes = min_t(size_t, len,
-					      (free->length - roffs));
-				roffs = 0;
-			} else {
-				bytes = min_t(size_t, len, free->length);
-				boffs = free->offset;
-			}
-			memcpy(oob, chip->oob_poi + boffs, bytes);
-			oob += bytes;
-		}
-		return oob;
-	}
+	case MTD_OPS_AUTO_OOB:
+		ret = mtd_ooblayout_get_databytes(mtd, oob, chip->oob_poi,
+						  ops->ooboffs, len);
+		BUG_ON(ret);
+		return oob + len;
+
 	default:
 		BUG();
 	}
@@ -1810,7 +1801,7 @@ read_retry:
 				int toread = min(oobreadlen, max_oobsize);
 
 				if (toread) {
-					oob = nand_transfer_oob(chip,
+					oob = nand_transfer_oob(mtd,
 						oob, ops, toread);
 					oobreadlen -= toread;
 				}
@@ -2108,7 +2099,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 			break;
 
 		len = min(len, readlen);
-		buf = nand_transfer_oob(chip, buf, ops, len);
+		buf = nand_transfer_oob(mtd, buf, ops, len);
 
 		if (chip->options & NAND_NEED_READRDY) {
 			/* Apply delay or wait for ready/busy pin */
@@ -2267,19 +2258,20 @@ static int nand_write_page_swecc(struct mtd_info *mtd, struct nand_chip *chip,
 				 const uint8_t *buf, int oob_required,
 				 int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Software ECC calculation */
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize)
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	return chip->ecc.write_page_raw(mtd, chip, buf, 1, page);
 }
@@ -2296,12 +2288,11 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				  const uint8_t *buf, int oob_required,
 				  int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int i, eccsize = chip->ecc.size, ret;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -2309,8 +2300,10 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 	}
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 
@@ -2338,11 +2331,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	int ecc_size      = chip->ecc.size;
 	int ecc_bytes     = chip->ecc.bytes;
 	int ecc_steps     = chip->ecc.steps;
-	uint32_t *eccpos  = chip->ecc.layout->eccpos;
 	uint32_t start_step = offset / ecc_size;
 	uint32_t end_step   = (offset + data_len - 1) / ecc_size;
 	int oob_bytes       = mtd->oobsize / ecc_steps;
-	int step, i;
+	int step, ret;
 
 	for (step = 0; step < ecc_steps; step++) {
 		/* configure controller for WRITE access */
@@ -2370,8 +2362,10 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	/* copy calculated ECC for whole page to chip->buffer->oob */
 	/* this include masked-value(0xFF) for unwritten subpages */
 	ecc_calc = chip->buffers->ecccalc;
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* write OOB buffer to NAND device */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -2508,6 +2502,7 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 			      struct mtd_oob_ops *ops)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
+	int ret;
 
 	/*
 	 * Initialise to all 0xFF, to avoid the possibility of left over OOB
@@ -2522,31 +2517,12 @@ static uint8_t *nand_fill_oob(struct mtd_info *mtd, uint8_t *oob, size_t len,
 		memcpy(chip->oob_poi + ops->ooboffs, oob, len);
 		return oob + len;
 
-	case MTD_OPS_AUTO_OOB: {
-		struct nand_oobfree *free = chip->ecc.layout->oobfree;
-		uint32_t boffs = 0, woffs = ops->ooboffs;
-		size_t bytes = 0;
-
-		for (; free->length && len; free++, len -= bytes) {
-			/* Write request not from offset 0? */
-			if (unlikely(woffs)) {
-				if (woffs >= free->length) {
-					woffs -= free->length;
-					continue;
-				}
-				boffs = free->offset + woffs;
-				bytes = min_t(size_t, len,
-					      (free->length - woffs));
-				woffs = 0;
-			} else {
-				bytes = min_t(size_t, len, free->length);
-				boffs = free->offset;
-			}
-			memcpy(chip->oob_poi + boffs, oob, bytes);
-			oob += bytes;
-		}
-		return oob;
-	}
+	case MTD_OPS_AUTO_OOB:
+		ret = mtd_ooblayout_set_databytes(mtd, oob, chip->oob_poi,
+						  ops->ooboffs, len);
+		BUG_ON(ret);
+		return oob + len;
+
 	default:
 		BUG();
 	}
@@ -4116,10 +4092,10 @@ static bool nand_ecc_strength_good(struct mtd_info *mtd)
  */
 int nand_scan_tail(struct mtd_info *mtd)
 {
-	int i;
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
 	struct nand_buffers *nbuf;
+	int ret;
 
 	/* New bad blocks should be marked in OOB, flash-based BBT, or both */
 	BUG_ON((chip->bbt_options & NAND_BBT_NO_OOB_BBM) &&
@@ -4311,15 +4287,20 @@ int nand_scan_tail(struct mtd_info *mtd)
 	if (!ecc->write_oob_raw)
 		ecc->write_oob_raw = ecc->write_oob;
 
+	/* propagate ecc info to mtd_info */
+	mtd->ecclayout = ecc->layout;
+	mtd->ecc_strength = ecc->strength;
+	mtd->ecc_step_size = ecc->size;
+
 	/*
 	 * The number of bytes available for a client to place data into
 	 * the out of band area.
 	 */
-	mtd->oobavail = 0;
-	if (ecc->layout) {
-		for (i = 0; ecc->layout->oobfree[i].length; i++)
-			mtd->oobavail += ecc->layout->oobfree[i].length;
-	}
+	ret = mtd_ooblayout_count_freebytes(mtd);
+	if (ret < 0)
+		ret = 0;
+
+	mtd->oobavail = ret;
 
 	/* ECC sanity check: warn if it's too weak */
 	if (!nand_ecc_strength_good(mtd))
@@ -4393,10 +4374,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	mtd->_block_markbad = nand_block_markbad;
 	mtd->writebufsize = mtd->writesize;
 
-	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
-	mtd->ecc_strength = ecc->strength;
-	mtd->ecc_step_size = ecc->size;
 	/*
 	 * Initialize bitflip_threshold to its default prior scan_bbt() call.
 	 * scan_bbt() might invoke mtd_read(), thus bitflip_threshold must be
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index b585bae..b3039de 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -196,7 +196,8 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 		printk(KERN_WARNING "eccsize %u is too large\n", eccsize);
 		goto fail;
 	}
-	if (layout->eccbytes != (eccsteps*eccbytes)) {
+
+	if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
 		printk(KERN_WARNING "invalid ecc layout\n");
 		goto fail;
 	}
-- 
2.1.4

Re: [PATCH v3 07/52] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

From: Harvey Hunt <hidden>
Date: 2016-02-26 14:35:18 

Hi Boris,

On 26/02/16 00:57, Boris Brezillon wrote:
quoted hunk
The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
  drivers/mtd/nand/nand_base.c | 183 +++++++++++++++++++------------------------
  drivers/mtd/nand/nand_bch.c  |   3 +-
  2 files changed, 82 insertions(+), 104 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 91672bf..17504f2 100644
[...]

I just pulled your nand/ecclayout branch from github and tested out your 
latest patchset "mtd: rework ECC layout definition" on a Ci20 
(jz4780_{nand,bch}) and noticed that my board was failing to boot.

I bisected to this patch, here is the kernel's output during boot:

479556d ("mtd: nand: core: use mtd_ooblayout_xxx() helpers where 
appropriate"):

[ 0.256349] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[ 0.262860] nand: Micron MT29F64G08CBAAAWP
[ 0.266970] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size: 8192, 
OOB size: 448
[ 0.274856] jz4780-nand 1b000000.nand-controller: using hardware BCH 
(strength 24, size 1024, bytes 42)
[ 0.288982] Bad block table not found for chip 0
[ 0.297673] Bad block table not found for chip 0
[ 0.302328] Scanning device for bad blocks
[ 0.320135] Bad eraseblock 90 at 0x00000b400000
[ 0.324829] Bad eraseblock 91 at 0x00000b600000
[ 0.931085] Bad eraseblock 4092 at 0x0001ff800000
[ 0.935947] Bad eraseblock 4093 at 0x0001ffa00000
[ 0.944878] nand_bbt: error while writing bad block table -34
[ 0.950666] jz4780-nand: probe of 1b000000.nand-controller failed with 
error -34
[ 0.958302] UBI error: cannot open mtd 3, error -19
[ 0.963002] UBI error: cannot open mtd 4, error -19[ 0.970419] clk: Not 
disabling unused clocks
[ 0.975011] UBIFS error (pid: 1): cannot open "ubi1:root", error -19VFS: 
Cannot open root device "ubi1:root" or unknown-block(0,0): error -19
[ 0.987810] Please append a correct "root=" boot option; here are the 
available partitions:
[ 0.996210] Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)
[ 1.004498] Rebooting in 10 seconds..

6625d32 ("mtd: use mtd_ooblayout_xxx() helpers where appropriate"):

[ 0.256232] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[ 0.262745] nand: Micron MT29F64G08CBAAAWP
[ 0.266854] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size: 8192, 
OOB size: 448
[ 0.274739] jz4780-nand 1b000000.nand-controller: using hardware BCH 
(strength 24, size 1024, bytes 42)
[ 0.285993] Bad block table found at page 1048320, version 0x01
[ 0.294353] Bad block table found at page 1048064, version 0x01
[ 0.301523] nand_read_bbt: bad block at 0x00000b400000
[ 0.306677] nand_read_bbt: bad block at 0x00000b600000
[ 0.312289] 5 ofpart partitions found on MTD device 
1b000000.nand-controller.1
[ 0.319553] Creating 5 MTD partitions on "1b000000.nand-controller.1":
[ 0.326098] 0x000000000000-0x000000800000 : "u-boot-spl"
[ 0.331757] 0x000000800000-0x000000a00000 : "u-boot"
[ 0.337185] 0x000000a00000-0x000000c00000 : "u-boot-env"
[ 0.342903] 0x000000c00000-0x000004c00000 : "boot"
[ 0.348109] 0x000004c00000-0x000200000000 : "system"
[ 0.354284] ubi0 error: ubi_attach_mtd_dev: More than 64 PEBs are needed 
for fastmap, sorry.
[...]

I'll look into this more later today, but wanted to run it by you in 
case you have any thoughts.

Thanks,

Harvey

Re: [PATCH v3 07/52] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 15:11:12 

Hi Harvey,

On Fri, 26 Feb 2016 14:35:08 +0000
Harvey Hunt [off-list ref] wrote:

Hi Boris,

On 26/02/16 00:57, Boris Brezillon wrote:
quoted
The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
  drivers/mtd/nand/nand_base.c | 183 +++++++++++++++++++------------------------
  drivers/mtd/nand/nand_bch.c  |   3 +-
  2 files changed, 82 insertions(+), 104 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 91672bf..17504f2 100644
[...]

I just pulled your nand/ecclayout branch from github and tested out your 
latest patchset "mtd: rework ECC layout definition" on a Ci20 
(jz4780_{nand,bch}) and noticed that my board was failing to boot.

I bisected to this patch, here is the kernel's output during boot:

479556d ("mtd: nand: core: use mtd_ooblayout_xxx() helpers where 
appropriate"):

[ 0.256349] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[ 0.262860] nand: Micron MT29F64G08CBAAAWP
[ 0.266970] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size: 8192, 
OOB size: 448
[ 0.274856] jz4780-nand 1b000000.nand-controller: using hardware BCH 
(strength 24, size 1024, bytes 42)
[ 0.288982] Bad block table not found for chip 0
[ 0.297673] Bad block table not found for chip 0
[ 0.302328] Scanning device for bad blocks
[ 0.320135] Bad eraseblock 90 at 0x00000b400000
[ 0.324829] Bad eraseblock 91 at 0x00000b600000
[ 0.931085] Bad eraseblock 4092 at 0x0001ff800000
[ 0.935947] Bad eraseblock 4093 at 0x0001ffa00000
[ 0.944878] nand_bbt: error while writing bad block table -34
[ 0.950666] jz4780-nand: probe of 1b000000.nand-controller failed with 
error -34
[ 0.958302] UBI error: cannot open mtd 3, error -19
[ 0.963002] UBI error: cannot open mtd 4, error -19[ 0.970419] clk: Not 
disabling unused clocks
[ 0.975011] UBIFS error (pid: 1): cannot open "ubi1:root", error -19VFS: 
Cannot open root device "ubi1:root" or unknown-block(0,0): error -19
[ 0.987810] Please append a correct "root=" boot option; here are the 
available partitions:
[ 0.996210] Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)
[ 1.004498] Rebooting in 10 seconds..

6625d32 ("mtd: use mtd_ooblayout_xxx() helpers where appropriate"):

[ 0.256232] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[ 0.262745] nand: Micron MT29F64G08CBAAAWP
[ 0.266854] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size: 8192, 
OOB size: 448
[ 0.274739] jz4780-nand 1b000000.nand-controller: using hardware BCH 
(strength 24, size 1024, bytes 42)
[ 0.285993] Bad block table found at page 1048320, version 0x01
[ 0.294353] Bad block table found at page 1048064, version 0x01
[ 0.301523] nand_read_bbt: bad block at 0x00000b400000
[ 0.306677] nand_read_bbt: bad block at 0x00000b600000
[ 0.312289] 5 ofpart partitions found on MTD device 
1b000000.nand-controller.1
[ 0.319553] Creating 5 MTD partitions on "1b000000.nand-controller.1":
[ 0.326098] 0x000000000000-0x000000800000 : "u-boot-spl"
[ 0.331757] 0x000000800000-0x000000a00000 : "u-boot"
[ 0.337185] 0x000000a00000-0x000000c00000 : "u-boot-env"
[ 0.342903] 0x000000c00000-0x000004c00000 : "boot"
[ 0.348109] 0x000004c00000-0x000200000000 : "system"
[ 0.354284] ubi0 error: ubi_attach_mtd_dev: More than 64 PEBs are needed 
for fastmap, sorry.
[...]

I'll look into this more later today, but wanted to run it by you in 
case you have any thoughts.
Can you apply this patch [1], and let me know if you see the additional
trace?

Thanks,

Boris

[1]http://code.bulix.org/l2hkl1-91947

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v3 07/52] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

From: Harvey Hunt <hidden>
Date: 2016-02-26 15:17:33 

Hi Boris,

On 26/02/16 15:10, Boris Brezillon wrote:
Hi Harvey,

On Fri, 26 Feb 2016 14:35:08 +0000
Harvey Hunt [off-list ref] wrote:
quoted
[...]
I'll look into this more later today, but wanted to run it by you in
case you have any thoughts.
Can you apply this patch [1], and let me know if you see the additional
trace?
I applied the patch, the following is the (unchanged) output:

[    0.256375] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[    0.262887] nand: Micron MT29F64G08CBAAAWP
[    0.266995] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size: 
8192, OOB size: 448
[    0.274881] jz4780-nand 1b000000.nand-controller: using hardware BCH 
(strength 24, size 1024, bytes 42)
[    0.289046] Bad block table not found for chip 0
[    0.297769] Bad block table not found for chip 0
[    0.302425] Scanning device for bad blocks
[    0.320239] Bad eraseblock 90 at 0x00000b400000
[    0.324934] Bad eraseblock 91 at 0x00000b600000
[    0.931054] Bad eraseblock 4092 at 0x0001ff800000
[    0.935917] Bad eraseblock 4093 at 0x0001ffa00000
[    0.944660] nand_bbt: error while writing bad block table -34
[    0.950448] jz4780-nand: probe of 1b000000.nand-controller failed 
with error -34
[    0.958079] UBI error: cannot open mtd 3, error -19
[    0.962788] UBI error: cannot open mtd 4, error -19[    0.970229] 
clk: Not disabling unused clocks

Thanks,

Boris

[1]http://code.bulix.org/l2hkl1-91947
Thanks,

Harvey

Re: [PATCH v3 07/52] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 18:33:41 

Hi Harvey,

On Fri, 26 Feb 2016 15:17:28 +0000
Harvey Hunt [off-list ref] wrote:

Hi Boris,

On 26/02/16 15:10, Boris Brezillon wrote:
quoted
Hi Harvey,

On Fri, 26 Feb 2016 14:35:08 +0000
Harvey Hunt [off-list ref] wrote:
quoted
[...]
I'll look into this more later today, but wanted to run it by you in
case you have any thoughts.
Can you apply this patch [1], and let me know if you see the additional
trace?
I applied the patch, the following is the (unchanged) output:

[    0.256375] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[    0.262887] nand: Micron MT29F64G08CBAAAWP
[    0.266995] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size: 
8192, OOB size: 448
[    0.274881] jz4780-nand 1b000000.nand-controller: using hardware BCH 
(strength 24, size 1024, bytes 42)
[    0.289046] Bad block table not found for chip 0
[    0.297769] Bad block table not found for chip 0
[    0.302425] Scanning device for bad blocks
[    0.320239] Bad eraseblock 90 at 0x00000b400000
[    0.324934] Bad eraseblock 91 at 0x00000b600000
[    0.931054] Bad eraseblock 4092 at 0x0001ff800000
[    0.935917] Bad eraseblock 4093 at 0x0001ffa00000
[    0.944660] nand_bbt: error while writing bad block table -34
[    0.950448] jz4780-nand: probe of 1b000000.nand-controller failed 
with error -34
[    0.958079] UBI error: cannot open mtd 3, error -19
[    0.962788] UBI error: cannot open mtd 4, error -19[    0.970229] 
clk: Not disabling unused clocks
Can you test with this one [1]?

[1]http://code.bulix.org/36oytz-91960


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v3 07/52] mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate

From: Harvey Hunt <hidden>
Date: 2016-02-29 10:33:55 

Hi Boris,

On 26/02/16 18:33, Boris Brezillon wrote:
Hi Harvey,

On Fri, 26 Feb 2016 15:17:28 +0000
Harvey Hunt [off-list ref] wrote:
quoted
Hi Boris,

On 26/02/16 15:10, Boris Brezillon wrote:
quoted
Hi Harvey,

On Fri, 26 Feb 2016 14:35:08 +0000
Harvey Hunt [off-list ref] wrote:
quoted
[...]
I'll look into this more later today, but wanted to run it by you in
case you have any thoughts.
Can you apply this patch [1], and let me know if you see the additional
trace?
I applied the patch, the following is the (unchanged) output:

[    0.256375] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x88
[    0.262887] nand: Micron MT29F64G08CBAAAWP
[    0.266995] nand: 8192 MiB, MLC, erase size: 2048 KiB, page size:
8192, OOB size: 448
[    0.274881] jz4780-nand 1b000000.nand-controller: using hardware BCH
(strength 24, size 1024, bytes 42)
[    0.289046] Bad block table not found for chip 0
[    0.297769] Bad block table not found for chip 0
[    0.302425] Scanning device for bad blocks
[    0.320239] Bad eraseblock 90 at 0x00000b400000
[    0.324934] Bad eraseblock 91 at 0x00000b600000
[    0.931054] Bad eraseblock 4092 at 0x0001ff800000
[    0.935917] Bad eraseblock 4093 at 0x0001ffa00000
[    0.944660] nand_bbt: error while writing bad block table -34
[    0.950448] jz4780-nand: probe of 1b000000.nand-controller failed
with error -34
[    0.958079] UBI error: cannot open mtd 3, error -19
[    0.962788] UBI error: cannot open mtd 4, error -19[    0.970229]
clk: Not disabling unused clocks
Can you test with this one [1]?

[1]http://code.bulix.org/36oytz-91960
With that patch applied, my Ci20 successfully boots again.

Thanks for looking into it :-)

Harvey

[PATCH v3 08/52] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:59:19 

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 20cbaab..ac3dd3f 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
 			dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, *(buf + byte_pos));
 		} else {
+			struct mtd_oob_region oobregion;
+
 			/* Bit flip in OOB area */
 			tmp = sector_num * nand_chip->ecc.bytes
 					+ (byte_pos - sector_size);
 			err_byte = ecc[tmp];
 			ecc[tmp] ^= (1 << bit_pos);
 
-			pos = tmp + nand_chip->ecc.layout->eccpos[0];
+			mtd_ooblayout_ecc(mtd, 0, &oobregion);
+			pos = tmp + oobregion.offset;
 			dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 				pos, bit_pos, err_byte, ecc[tmp]);
 		}
@@ -931,7 +934,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
 	int eccsize = chip->ecc.size * chip->ecc.steps;
 	uint8_t *oob = chip->oob_poi;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint32_t stat;
 	unsigned long end_time;
 	int bitflips = 0;
@@ -953,7 +955,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 
 	stat = pmecc_readl_relaxed(host->ecc, ISR);
 	if (stat != 0) {
-		bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
+		struct mtd_oob_region oobregion;
+
+		mtd_ooblayout_ecc(mtd, 0, &oobregion);
+		bitflips = pmecc_correction(mtd, stat, buf,
+					    &oob[oobregion.offset]);
 		if (bitflips < 0)
 			/* uncorrectable errors */
 			return 0;
@@ -967,8 +973,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 		int page)
 {
 	struct atmel_nand_host *host = nand_get_controller_data(chip);
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	int i, j;
+	struct mtd_oob_region oobregion = { };
+	int i, j, section = 0;
 	unsigned long end_time;
 
 	if (!host->nfc || !host->nfc->write_by_sram) {
@@ -987,11 +993,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		for (j = 0; j < chip->ecc.bytes; j++) {
-			int pos;
+			if (!oobregion.length)
+				mtd_ooblayout_ecc(mtd, section++, &oobregion);
 
-			pos = i * chip->ecc.bytes + j;
-			chip->oob_poi[eccpos[pos]] =
+			chip->oob_poi[oobregion.offset++] =
 				pmecc_readb_ecc_relaxed(host->ecc, i, j);
+			oobregion.length--;
 		}
 	}
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1005,6 +1012,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
 	uint32_t val = 0;
 	struct nand_ecclayout *ecc_layout;
+	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
@@ -1056,9 +1064,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 
 	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
-	pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-			ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
+		     oobregion.offset + ecc_layout->eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1359,12 +1368,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	int eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *p = buf;
 	uint8_t *oob = chip->oob_poi;
 	uint8_t *ecc_pos;
 	int stat;
 	unsigned int max_bitflips = 0;
+	struct mtd_oob_region oobregion = {};
 
 	/*
 	 * Errata: ALE is incorrectly wired up to the ECC controller
@@ -1382,19 +1391,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, p, eccsize);
 
 	/* move to ECC position if needed */
-	if (eccpos[0] != 0) {
-		/* This only works on large pages
-		 * because the ECC controller waits for
-		 * NAND_CMD_RNDOUTSTART after the
-		 * NAND_CMD_RNDOUT.
-		 * anyway, for small pages, the eccpos[0] == 0
+	mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (oobregion.offset != 0) {
+		/*
+		 * This only works on large pages because the ECC controller
+		 * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
+		 * Anyway, for small pages, the first ECC byte is at offset
+		 * 0 in the OOB area.
 		 */
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-				mtd->writesize + eccpos[0], -1);
+			      mtd->writesize + oobregion.offset, -1);
 	}
 
 	/* the ECC controller needs to read the ECC just after the data */
-	ecc_pos = oob + eccpos[0];
+	ecc_pos = oob + oobregion.offset;
 	chip->read_buf(mtd, ecc_pos, eccbytes);
 
 	/* check if there's an error */
-- 
2.1.4

[PATCH v3 09/52] mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:59:33 

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 43f5a3a..2e970ac 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -257,18 +257,22 @@ static int is_blank(struct mtd_info *mtd, unsigned int bufnum)
 	u8 __iomem *addr = priv->vbase + bufnum * (mtd->writesize * 2);
 	u32 __iomem *mainarea = (u32 __iomem *)addr;
 	u8 __iomem *oob = addr + mtd->writesize;
-	int i;
+	struct mtd_oob_region oobregion = { };
+	int i, section = 0;
 
 	for (i = 0; i < mtd->writesize / 4; i++) {
 		if (__raw_readl(&mainarea[i]) != 0xffffffff)
 			return 0;
 	}
 
-	for (i = 0; i < chip->ecc.layout->eccbytes; i++) {
-		int pos = chip->ecc.layout->eccpos[i];
+	mtd_ooblayout_ecc(mtd, section++, &oobregion);
+	while (oobregion.length) {
+		for (i = 0; i < oobregion.length; i++) {
+			if (__raw_readb(&oob[oobregion.offset + i]) != 0xff)
+				return 0;
+		}
 
-		if (__raw_readb(&oob[pos]) != 0xff)
-			return 0;
+		mtd_ooblayout_ecc(mtd, section++, &oobregion);
 	}
 
 	return 1;
-- 
2.1.4

[PATCH v3 10/52] mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:59:36 

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 8122c69..3a29b65 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -1327,18 +1327,19 @@ static int gpmi_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
 static int
 gpmi_ecc_write_oob(struct mtd_info *mtd, struct nand_chip *chip, int page)
 {
-	struct nand_oobfree *of = mtd->ecclayout->oobfree;
+	struct mtd_oob_region of = { };
 	int status = 0;
 
 	/* Do we have available oob area? */
-	if (!of->length)
+	mtd_ooblayout_free(mtd, 0, &of);
+	if (!of.length)
 		return -EPERM;
 
 	if (!nand_is_slc(chip))
 		return -EPERM;
 
-	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of->offset, page);
-	chip->write_buf(mtd, chip->oob_poi + of->offset, of->length);
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize + of.offset, page);
+	chip->write_buf(mtd, chip->oob_poi + of.offset, of.length);
 	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 
 	status = chip->waitfunc(mtd, chip);
-- 
2.1.4

[PATCH v3 11/52] mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 00:59:51 

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/lpc32xx_slc.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 3b8f373..10cf8e62 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -604,7 +604,8 @@ static int lpc32xx_nand_read_page_syndrome(struct mtd_info *mtd,
 					   int oob_required, int page)
 {
 	struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
-	int stat, i, status;
+	struct mtd_oob_region oobregion = { };
+	int stat, i, status, error;
 	uint8_t *oobecc, tmpecc[LPC32XX_ECC_SAVE_SIZE];
 
 	/* Issue read command */
@@ -620,7 +621,11 @@ static int lpc32xx_nand_read_page_syndrome(struct mtd_info *mtd,
 	lpc32xx_slc_ecc_copy(tmpecc, (uint32_t *) host->ecc_buf, chip->ecc.steps);
 
 	/* Pointer to ECC data retrieved from NAND spare area */
-	oobecc = chip->oob_poi + chip->ecc.layout->eccpos[0];
+	error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (error)
+		return error;
+
+	oobecc = chip->oob_poi + oobregion.offset;
 
 	for (i = 0; i < chip->ecc.steps; i++) {
 		stat = chip->ecc.correct(mtd, buf, oobecc,
@@ -666,7 +671,8 @@ static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 					    int oob_required, int page)
 {
 	struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
-	uint8_t *pb = chip->oob_poi + chip->ecc.layout->eccpos[0];
+	struct mtd_oob_region oobregion = { };
+	uint8_t *pb;
 	int error;
 
 	/* Write data, calculate ECC on outbound data */
@@ -678,6 +684,11 @@ static int lpc32xx_nand_write_page_syndrome(struct mtd_info *mtd,
 	 * The calculated ECC needs some manual work done to it before
 	 * committing it to NAND. Process the calculated ECC and place
 	 * the resultant values directly into the OOB buffer. */
+	error = mtd_ooblayout_ecc(mtd, 0, &oobregion);
+	if (error)
+		return error;
+
+	pb = chip->oob_poi + oobregion.offset;
 	lpc32xx_slc_ecc_copy(pb, (uint32_t *)host->ecc_buf, chip->ecc.steps);
 
 	/* Write ECC data to device */
-- 
2.1.4

[PATCH v3 14/52] mtd: add mtd_set_ecclayout() helper function

From: Boris Brezillon <hidden>
Date: 2016-02-26 01:00:06 

Add an mtd_set_ecclayout() helper function to avoid direct accesses to the
mtd->ecclayout field. This will ease future reworks of ECC layout
definition.

Signed-off-by: Boris Brezillon <redacted>
---
 include/linux/mtd/mtd.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index b141f26..6250dd8 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -286,6 +286,12 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
+static inline void mtd_set_ecclayout(struct mtd_info *mtd,
+				     struct nand_ecclayout *ecclayout)
+{
+	mtd->ecclayout = ecclayout;
+}
+
 static inline void mtd_set_of_node(struct mtd_info *mtd,
 				   struct device_node *np)
 {
-- 
2.1.4

[PATCH v3 13/52] mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 01:00:09 

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/onenand/onenand_base.c | 75 ++++++++------------------------------
 1 file changed, 15 insertions(+), 60 deletions(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index af28bb3..20fdf8c 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -1024,34 +1024,15 @@ static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int col
 				int thislen)
 {
 	struct onenand_chip *this = mtd->priv;
-	struct nand_oobfree *free;
-	int readcol = column;
-	int readend = column + thislen;
-	int lastgap = 0;
-	unsigned int i;
-	uint8_t *oob_buf = this->oob_buf;
-
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		if (readcol >= lastgap)
-			readcol += free->offset - lastgap;
-		if (readend >= lastgap)
-			readend += free->offset - lastgap;
-		lastgap = free->offset + free->length;
-	}
-	this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		int free_end = free->offset + free->length;
-		if (free->offset < readend && free_end > readcol) {
-			int st = max_t(int,free->offset,readcol);
-			int ed = min_t(int,free_end,readend);
-			int n = ed - st;
-			memcpy(buf, oob_buf + st, n);
-			buf += n;
-		} else if (column == 0)
-			break;
-	}
+	int ret;
+
+	this->read_bufferram(mtd, ONENAND_SPARERAM, this->oob_buf, 0,
+			     mtd->oobsize);
+	ret = mtd_ooblayout_get_databytes(mtd, buf, this->oob_buf,
+					  column, thislen);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
@@ -1808,34 +1789,7 @@ static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
 				  const u_char *buf, int column, int thislen)
 {
-	struct onenand_chip *this = mtd->priv;
-	struct nand_oobfree *free;
-	int writecol = column;
-	int writeend = column + thislen;
-	int lastgap = 0;
-	unsigned int i;
-
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		if (writecol >= lastgap)
-			writecol += free->offset - lastgap;
-		if (writeend >= lastgap)
-			writeend += free->offset - lastgap;
-		lastgap = free->offset + free->length;
-	}
-	free = this->ecclayout->oobfree;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
-		int free_end = free->offset + free->length;
-		if (free->offset < writeend && free_end > writecol) {
-			int st = max_t(int,free->offset,writecol);
-			int ed = min_t(int,free_end,writeend);
-			int n = ed - st;
-			memcpy(oob_buf + st, buf, n);
-			buf += n;
-		} else if (column == 0)
-			break;
-	}
-	return 0;
+	return mtd_ooblayout_set_databytes(mtd, buf, oob_buf, column, thislen);
 }
 
 /**
@@ -4037,10 +3991,11 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 	 * The number of bytes available for a client to place data into
 	 * the out of band area
 	 */
-	mtd->oobavail = 0;
-	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
-	    this->ecclayout->oobfree[i].length; i++)
-		mtd->oobavail += this->ecclayout->oobfree[i].length;
+	ret = mtd_ooblayout_count_freebytes(mtd);
+	if (ret < 0)
+		ret = 0;
+
+	mtd->oobavail = ret;
 
 	mtd->ecclayout = this->ecclayout;
 	mtd->ecc_strength = 1;
-- 
2.1.4

[PATCH v3 12/52] mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 01:00:11 

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/omap2.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 0749ca1..4ebf16b 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1495,9 +1495,8 @@ static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data,
 static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 			       const uint8_t *buf, int oob_required, int page)
 {
-	int i;
+	int ret;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
 
 	/* Enable GPMC ecc engine */
 	chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
@@ -1508,8 +1507,10 @@ static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	/* Update ecc vector from GPMC result registers */
 	chip->ecc.calculate(mtd, buf, &ecc_calc[0]);
 
-	for (i = 0; i < chip->ecc.total; i++)
-		chip->oob_poi[eccpos[i]] = ecc_calc[i];
+	ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	/* Write ecc vector to OOB area */
 	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1536,10 +1537,7 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	uint8_t *ecc_code = chip->buffers->ecccode;
-	uint32_t *eccpos = chip->ecc.layout->eccpos;
-	uint8_t *oob = &chip->oob_poi[eccpos[0]];
-	uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0];
-	int stat;
+	int stat, ret;
 	unsigned int max_bitflips = 0;
 
 	/* Enable GPMC ecc engine */
@@ -1549,13 +1547,16 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
 	chip->read_buf(mtd, buf, mtd->writesize);
 
 	/* Read oob bytes */
-	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1);
-	chip->read_buf(mtd, oob, chip->ecc.total);
+	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
+	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 
 	/* Calculate ecc bytes */
 	chip->ecc.calculate(mtd, buf, ecc_calc);
 
-	memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total);
+	ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
+					 chip->ecc.total);
+	if (ret)
+		return ret;
 
 	stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc);
 
-- 
2.1.4

[PATCH v3 15/52] mtd: use mtd_set_ecclayout() where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 01:00:20 

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/mtdconcat.c | 2 +-
 drivers/mtd/mtdpart.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 239a8c8..481565e 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,7 +777,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	concat->mtd.ecclayout = subdev[0]->ecclayout;
+	mtd_set_ecclayout(&concat->mtd, subdev[0]->ecclayout);
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 08de4b2..f53d9d7 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -533,7 +533,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 			part->name);
 	}
 
-	slave->mtd.ecclayout = master->ecclayout;
+	mtd_set_ecclayout(&slave->mtd, master->ecclayout);
 	slave->mtd.ecc_step_size = master->ecc_step_size;
 	slave->mtd.ecc_strength = master->ecc_strength;
 	slave->mtd.bitflip_threshold = master->bitflip_threshold;
-- 
2.1.4

[PATCH v3 16/52] mtd: nand: use mtd_set_ecclayout() where appropriate

From: Boris Brezillon <hidden>
Date: 2016-02-26 01:00:37 

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 17504f2..5093a3c 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4288,7 +4288,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
+	mtd_set_ecclayout(mtd, ecc->layout);
 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
-- 
2.1.4

Re: [PATCH v3 16/52] mtd: nand: use mtd_set_ecclayout() where appropriate

From: Brian Norris <computersforpeace@gmail.com>
Date: 2016-03-05 02:26:27 

On Fri, Feb 26, 2016 at 01:57:24AM +0100, Boris Brezillon wrote:
quoted hunk
Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 17504f2..5093a3c 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4288,7 +4288,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
+	mtd_set_ecclayout(mtd, ecc->layout);
I'm having trouble applying this one. For the life of me, I can't figure
out where you got this context from. This block only appears much later
in nand_scan_tail()...

Do you think you could post a git tree with your intended changes? I may
just try to pull something in like that instead.

BTW, I'm not sure the OMAP refactorings are going to come in time, but I
was planning to pull those directly from the TI folks (i.e., they won't
be rebased on l2-mtd.git), since there's some intermingling of platform
changes there. I think I can fix the conflicts fine, but FYI.

Brian

 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
-- 
2.1.4

Re: [PATCH v3 16/52] mtd: nand: use mtd_set_ecclayout() where appropriate

From: Boris Brezillon <hidden>
Date: 2016-03-05 08:53:52 

Hi Brian,

On Fri, 4 Mar 2016 18:26:21 -0800
Brian Norris [off-list ref] wrote:

On Fri, Feb 26, 2016 at 01:57:24AM +0100, Boris Brezillon wrote:
quoted
Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 17504f2..5093a3c 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4288,7 +4288,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
+	mtd_set_ecclayout(mtd, ecc->layout);
I'm having trouble applying this one. For the life of me, I can't figure
out where you got this context from. This block only appears much later
in nand_scan_tail()...
Patch 7 has moved this section upper in the function to avoid problems
when calculating the number of available/free OOB bytes.

Do you think you could post a git tree with your intended changes? I may
just try to pull something in like that instead.
Yep, it's there [1]. Note that this branch contains the two fixes I
talked about with Harvey and Stephan. I also made a few changes to use
ecc->total instead of calculating (ecc->steps * ecc->bytes).

BTW, I'm not sure the OMAP refactorings are going to come in time, but I
was planning to pull those directly from the TI folks (i.e., they won't
be rebased on l2-mtd.git), since there's some intermingling of platform
changes there. I think I can fix the conflicts fine, but FYI.
Okay, then I'll let you deal with those conflicts. I can check your
conflict resolution if you're unsure.

Thanks,

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v3 16/52] mtd: nand: use mtd_set_ecclayout() where appropriate

From: Boris Brezillon <hidden>
Date: 2016-03-05 09:01:21 

On Sat, 5 Mar 2016 09:53:37 +0100
Boris Brezillon [off-list ref] wrote:

Hi Brian,

On Fri, 4 Mar 2016 18:26:21 -0800
Brian Norris [off-list ref] wrote:
quoted
On Fri, Feb 26, 2016 at 01:57:24AM +0100, Boris Brezillon wrote:
quoted
Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 17504f2..5093a3c 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4288,7 +4288,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd->ecclayout = ecc->layout;
+	mtd_set_ecclayout(mtd, ecc->layout);
I'm having trouble applying this one. For the life of me, I can't figure
out where you got this context from. This block only appears much later
in nand_scan_tail()...
Patch 7 has moved this section upper in the function to avoid problems
when calculating the number of available/free OOB bytes.
quoted
Do you think you could post a git tree with your intended changes? I may
just try to pull something in like that instead.
Yep, it's there [1].
Forgot to paste the link.

Note that this branch contains the two fixes I
talked about with Harvey and Stephan. I also made a few changes to use
ecc->total instead of calculating (ecc->steps * ecc->bytes).
I'll probably also send a v4 with the fixes squashed in patch 5 and 7,
just for the record.

quoted
BTW, I'm not sure the OMAP refactorings are going to come in time, but I
was planning to pull those directly from the TI folks (i.e., they won't
be rebased on l2-mtd.git), since there's some intermingling of platform
changes there. I think I can fix the conflicts fine, but FYI.
Okay, then I'll let you deal with those conflicts. I can check your
conflict resolution if you're unsure.

Thanks,

Boris

[1]https://github.com/bbrezillon/linux-0day/tree/nand/ecclayout


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com





  

    
[PATCH v3 17/52] mtd: onenand: use mtd_set_ecclayout() where appropriate

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:00:56 
    

  

  
Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/onenand/onenand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 20fdf8c..d0fa505 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -3997,7 +3997,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	mtd->oobavail = ret;
 
-	mtd->ecclayout = this->ecclayout;
+	mtd_set_ecclayout(mtd, this->ecclayout);
 	mtd->ecc_strength = 1;
 
 	/* Fill in remaining MTD driver data */
-- 
2.1.4





  

    
[PATCH v3 18/52] mtd: docg3: use mtd_set_ecclayout() where appropriate

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:01:06 
    

  

  
Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.

Signed-off-by: Boris Brezillon <redacted>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/mtd/devices/docg3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index e7b2e43..6b516e1 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1857,7 +1857,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_read_oob = doc_read_oob;
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
-	mtd->ecclayout = &docg3_oobinfo;
+	mtd_set_ecclayout(mtd, &docg3_oobinfo);
 	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
-- 
2.1.4





  

    
[PATCH v3 19/52] mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:01:31 
    

  

  
ECC layout definitions are currently exposed using the nand_ecclayout
struct which embeds oobfree and eccpos arrays with predefined size.
This approach was acceptable when NAND chips were providing relatively
small OOB regions, but MLC and TLC now provide OOB regions of several
hundreds of bytes, which implies a non negligible overhead for everybody
even those who only need to support legacy NANDs.

Create an mtd_ooblayout_ops interface providing the same functionality
(expose the ECC and oobfree layout) without the need for this huge
structure.

The mtd->ecclayout is now deprecated and should be replaced by the
equivalent mtd_ooblayout_ops. In the meantime we provide a wrapper around
the ->ecclayout field to ease migration to this new model.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/mtdchar.c   |   4 +-
 drivers/mtd/mtdconcat.c |   2 +-
 drivers/mtd/mtdcore.c   | 165 +++++++++++++++++++++++++++++++++++-------------
 drivers/mtd/mtdpart.c   |  23 ++++++-
 include/linux/mtd/mtd.h |  32 ++++++++--
 5 files changed, 174 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index cd64ab7..3fad2c7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -888,7 +888,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	{
 		struct nand_oobinfo oi;
 
-		if (!mtd->ecclayout)
+		if (!mtd->ooblayout)
 			return -EOPNOTSUPP;
 
 		ret = get_oobinfo(mtd, &oi);
@@ -982,7 +982,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	{
 		struct nand_ecclayout_user *usrlay;
 
-		if (!mtd->ecclayout)
+		if (!mtd->ooblayout)
 			return -EOPNOTSUPP;
 
 		usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 481565e..d573606 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,7 +777,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
 
 	}
 
-	mtd_set_ecclayout(&concat->mtd, subdev[0]->ecclayout);
+	mtd_set_ooblayout(&concat->mtd, subdev[0]->ooblayout);
 
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index ab3a7b6..3b1dc09 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1016,49 +1016,15 @@ EXPORT_SYMBOL_GPL(mtd_read_oob);
 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
 		      struct mtd_oob_region *oobecc)
 {
-	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
-
 	memset(oobecc, 0, sizeof(*oobecc));
 
 	if (!mtd || section < 0)
 		return -EINVAL;
 
-	if (!mtd->ecclayout)
+	if (!mtd->ooblayout || !mtd->ooblayout->ecc)
 		return -ENOTSUPP;
 
-	/*
-	 * This logic allows us to reuse the ->ecclayout information and
-	 * expose them as ECC regions (as done for the OOB free regions).
-	 *
-	 * TODO: this should be dropped as soon as we get rid of the
-	 * ->ecclayout field.
-	 */
-	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
-		eccpos = mtd->ecclayout->eccpos[eccbyte];
-
-		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
-			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
-
-			if (eccpos + 1 == neccpos) {
-				length++;
-				continue;
-			}
-		}
-
-		if (section == cursection)
-			break;
-
-		length = 0;
-		cursection++;
-	}
-
-	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
-		return -ERANGE;
-
-	oobecc->length = length + 1;
-	oobecc->offset = eccpos - length;
-
-	return 0;
+	return mtd->ooblayout->ecc(mtd, section, oobecc);
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
 
@@ -1087,16 +1053,10 @@ int mtd_ooblayout_free(struct mtd_info *mtd, int section,
 	if (!mtd || section < 0)
 		return -EINVAL;
 
-	if (!mtd->ecclayout)
+	if (!mtd->ooblayout || !mtd->ooblayout->free)
 		return -ENOTSUPP;
 
-	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE)
-		return -ERANGE;
-
-	oobfree->offset = mtd->ecclayout->oobfree[section].offset;
-	oobfree->length = mtd->ecclayout->oobfree[section].length;
-
-	return 0;
+	return mtd->ooblayout->free(mtd, section, oobfree);
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
 
@@ -1395,6 +1355,123 @@ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
 }
 EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
 
+/**
+ * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation
+ * @mtd: MTD device structure
+ * @section: ECC section. Depending on the layout you may have all the ECC
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobecc: OOB region struct filled with the appropriate ECC position
+ *	    information
+ *
+ * This function is just a wrapper around the mtd->ecclayout field and is
+ * here to ease the transition to the mtd_ooblayout_ops approach.
+ * All it does is convert the layout->eccpos information into proper oob
+ * region definitions.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,
+			     struct mtd_oob_region *oobecc)
+{
+	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
+
+	if (!mtd->ecclayout)
+		return -ENOTSUPP;
+
+	/*
+	 * This logic allows us to reuse the ->ecclayout information and
+	 * expose them as ECC regions (as done for the OOB free regions).
+	 *
+	 * TODO: this should be dropped as soon as we get rid of the
+	 * ->ecclayout field.
+	 */
+	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
+		eccpos = mtd->ecclayout->eccpos[eccbyte];
+
+		if (eccbyte < mtd->ecclayout->eccbytes - 1) {
+			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
+
+			if (eccpos + 1 == neccpos) {
+				length++;
+				continue;
+			}
+		}
+
+		if (section == cursection)
+			break;
+
+		length = 0;
+		cursection++;
+	}
+
+	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
+		return -ERANGE;
+
+	oobecc->length = length + 1;
+	oobecc->offset = eccpos - length;
+
+	return 0;
+}
+
+/**
+ * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation
+ * @mtd: MTD device structure
+ * @section: Free section. Depending on the layout you may have all the free
+ *	     bytes stored in a single contiguous section, or one section
+ *	     per ECC chunk (and sometime several sections for a single ECC
+ *	     ECC chunk)
+ * @oobfree: OOB region struct filled with the appropriate free position
+ *	     information
+ *
+ * This function is just a wrapper around the mtd->ecclayout field and is
+ * here to ease the transition to the mtd_ooblayout_ops approach.
+ * All it does is convert the layout->oobfree information into proper oob
+ * region definitions.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+static int mtd_ecclayout_free(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobfree)
+{
+	struct nand_ecclayout *layout = mtd->ecclayout;
+
+	if (!layout)
+		return -ENOTSUPP;
+
+	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||
+	    !layout->oobfree[section].length)
+		return -ERANGE;
+
+	oobfree->offset = layout->oobfree[section].offset;
+	oobfree->length = layout->oobfree[section].length;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {
+	.ecc = mtd_ecclayout_ecc,
+	.free = mtd_ecclayout_free,
+};
+
+/**
+ * mtd_set_ecclayout - Attach an ecclayout to an MTD device
+ * @mtd: MTD device structure
+ * @ecclayout: The ecclayout to attach to the device
+ *
+ * Returns zero on success, a negative error code otherwise.
+ */
+void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)
+{
+	if (!mtd || !ecclayout)
+		return;
+
+	mtd->ecclayout = ecclayout;
+	mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);
+}
+EXPORT_SYMBOL_GPL(mtd_set_ecclayout);
+
 /*
  * Method to access the protection register area, present in some flash
  * devices. The user data is one time programmable but the factory data is read
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index f53d9d7..1f13e32 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -317,6 +317,27 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
 	return res;
 }
 
+static int part_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return mtd_ooblayout_ecc(part->master, section, oobregion);
+}
+
+static int part_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return mtd_ooblayout_free(part->master, section, oobregion);
+}
+
+static const struct mtd_ooblayout_ops part_ooblayout_ops = {
+	.ecc = part_ooblayout_ecc,
+	.free = part_ooblayout_free,
+};
+
 static inline void free_partition(struct mtd_part *p)
 {
 	kfree(p->mtd.name);
@@ -533,7 +554,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 			part->name);
 	}
 
-	mtd_set_ecclayout(&slave->mtd, master->ecclayout);
+	mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
 	slave->mtd.ecc_step_size = master->ecc_step_size;
 	slave->mtd.ecc_strength = master->ecc_strength;
 	slave->mtd.bitflip_threshold = master->bitflip_threshold;
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 6250dd8..a38fe9a 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -101,6 +101,9 @@ struct mtd_oob_ops {
  * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
  * for export to user-space via the ECCGETLAYOUT ioctl.
  * nand_ecclayout should be expandable in the future simply by the above macros.
+ *
+ * This structure is now deprecated, you should use struct nand_ecclayout_ops
+ * to describe your OOB layout.
  */
 struct nand_ecclayout {
 	__u32 eccbytes;
@@ -123,6 +126,22 @@ struct mtd_oob_region {
 	u32 length;
 };
 
+/*
+ * struct mtd_ooblayout_ops - NAND OOB layout operations
+ * @ecc: function returning an ECC region in the OOB area.
+ *	 Should return -ERANGE if %section exceeds the total number of
+ *	 ECC sections.
+ * @free: function returning a free region in the OOB area.
+ *	  Should return -ERANGE if %section exceeds the total number of
+ *	  free sections.
+ */
+struct mtd_ooblayout_ops {
+	int (*ecc)(struct mtd_info *mtd, int section,
+		   struct mtd_oob_region *oobecc);
+	int (*free)(struct mtd_info *mtd, int section,
+		    struct mtd_oob_region *oobfree);
+};
+
 struct module;	/* only needed for owner field in mtd_info */
 
 struct mtd_info {
@@ -181,9 +200,12 @@ struct mtd_info {
 	const char *name;
 	int index;
 
-	/* ECC layout structure pointer - read only! */
+	/* [Deprecated] ECC layout structure pointer - read only! */
 	struct nand_ecclayout *ecclayout;
 
+	/* OOB layout description */
+	const struct mtd_ooblayout_ops *ooblayout;
+
 	/* the ecc step size. */
 	unsigned int ecc_step_size;
 
@@ -286,10 +308,12 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
 int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
 int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
 
-static inline void mtd_set_ecclayout(struct mtd_info *mtd,
-				     struct nand_ecclayout *ecclayout)
+void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);
+
+static inline void mtd_set_ooblayout(struct mtd_info *mtd,
+				     const struct mtd_ooblayout_ops *ooblayout)
 {
-	mtd->ecclayout = ecclayout;
+	mtd->ooblayout = ooblayout;
 }
 
 static inline void mtd_set_of_node(struct mtd_info *mtd,
-- 
2.1.4





  

    
[PATCH v3 20/52] mtd: docg3: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:02:00 
    

  

  
Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <redacted>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/mtd/devices/docg3.c | 46 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 6b516e1..b833e6c 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -67,16 +67,40 @@ module_param(reliable_mode, uint, 0);
 MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, "
 		 "2=reliable) : MLC normal operations are in normal mode");
 
-/**
- * struct docg3_oobinfo - DiskOnChip G3 OOB layout
- * @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC)
- * @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC)
- * @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15
- */
-static struct nand_ecclayout docg3_oobinfo = {
-	.eccbytes = 8,
-	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14},
-	.oobfree = {{0, 7}, {15, 1} },
+static int docg3_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	/* byte 7 is Hamming ECC, byte 8-14 are BCH ECC */
+	oobregion->offset = 7;
+	oobregion->length = 8;
+
+	return 0;
+}
+
+static int docg3_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	/* free bytes: byte 0 until byte 6, byte 15 */
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 7;
+	} else {
+		oobregion->offset = 15;
+		oobregion->length = 1;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops nand_ooblayout_docg3_ops = {
+	.ecc = docg3_ooblayout_ecc,
+	.free = docg3_ooblayout_free,
 };
 
 static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
@@ -1857,7 +1881,7 @@ static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 	mtd->_read_oob = doc_read_oob;
 	mtd->_write_oob = doc_write_oob;
 	mtd->_block_isbad = doc_block_isbad;
-	mtd_set_ecclayout(mtd, &docg3_oobinfo);
+	mtd_set_ooblayout(mtd, &nand_ooblayout_docg3_ops);
 	mtd->oobavail = 8;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
 
-- 
2.1.4





  

    
[PATCH v3 21/52] mtd: nand: implement the default mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:02:34 
    

  

  
Replace the default nand_ecclayout definitions for large and small page
devices with the equivalent mtd_ooblayout_ops.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/nand_base.c | 148 ++++++++++++++++++++++++++++---------------
 include/linux/mtd/nand.h     |   3 +
 2 files changed, 99 insertions(+), 52 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 5093a3c..71d5948 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -48,50 +48,6 @@
 #include <linux/mtd/partitions.h>
 #include <linux/of_mtd.h>
 
-/* Define default oob placement schemes for large and small page devices */
-static struct nand_ecclayout nand_oob_8 = {
-	.eccbytes = 3,
-	.eccpos = {0, 1, 2},
-	.oobfree = {
-		{.offset = 3,
-		 .length = 2},
-		{.offset = 6,
-		 .length = 2} }
-};
-
-static struct nand_ecclayout nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = {0, 1, 2, 3, 6, 7},
-	.oobfree = {
-		{.offset = 8,
-		 . length = 8} }
-};
-
-static struct nand_ecclayout nand_oob_64 = {
-	.eccbytes = 24,
-	.eccpos = {
-		   40, 41, 42, 43, 44, 45, 46, 47,
-		   48, 49, 50, 51, 52, 53, 54, 55,
-		   56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 38} }
-};
-
-static struct nand_ecclayout nand_oob_128 = {
-	.eccbytes = 48,
-	.eccpos = {
-		   80, 81, 82, 83, 84, 85, 86, 87,
-		   88, 89, 90, 91, 92, 93, 94, 95,
-		   96, 97, 98, 99, 100, 101, 102, 103,
-		   104, 105, 106, 107, 108, 109, 110, 111,
-		   112, 113, 114, 115, 116, 117, 118, 119,
-		   120, 121, 122, 123, 124, 125, 126, 127},
-	.oobfree = {
-		{.offset = 2,
-		 .length = 78} }
-};
-
 static int nand_get_device(struct mtd_info *mtd, int new_state);
 
 static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
@@ -103,6 +59,92 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
  */
 DEFINE_LED_TRIGGER(nand_led_trigger);
 
+/* Define default oob placement schemes for large and small page devices */
+static int nand_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 4;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = (ecc->bytes * ecc->steps) - 4;
+	}
+
+	return 0;
+}
+
+static int nand_ooblayout_free_sp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->oobsize == 16) {
+		if (section)
+			return -ERANGE;
+
+		oobregion->length = 8;
+		oobregion->offset = 8;
+	} else {
+		oobregion->length = 2;
+		if (!section)
+			oobregion->offset = 3;
+		else
+			oobregion->offset = 6;
+	}
+
+	return 0;
+}
+
+const struct mtd_ooblayout_ops nand_ooblayout_sp_ops = {
+	.ecc = nand_ooblayout_ecc_sp,
+	.free = nand_ooblayout_free_sp,
+};
+EXPORT_SYMBOL_GPL(nand_ooblayout_sp_ops);
+
+static int nand_ooblayout_ecc_lp(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = ecc->bytes * ecc->steps;
+	oobregion->offset = mtd->oobsize - oobregion->length;
+
+	return 0;
+}
+
+static int nand_ooblayout_free_lp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = mtd->oobsize - (ecc->bytes * ecc->steps) - 2;
+	oobregion->offset = 2;
+
+	return 0;
+}
+
+const struct mtd_ooblayout_ops nand_ooblayout_lp_ops = {
+	.ecc = nand_ooblayout_ecc_lp,
+	.free = nand_ooblayout_free_lp,
+};
+EXPORT_SYMBOL_GPL(nand_ooblayout_lp_ops);
+
 static int check_offs_len(struct mtd_info *mtd,
 					loff_t ofs, uint64_t len)
 {
@@ -4120,21 +4162,24 @@ int nand_scan_tail(struct mtd_info *mtd)
 	chip->oob_poi = chip->buffers->databuf + mtd->writesize;
 
 	/*
+	 * Set the provided ECC layout. If ecc->layout is NULL, the MTD core
+	 * will just leave mtd->ooblayout to NULL, if it's not NULL, it will
+	 * set ->ooblayout to the default ecclayout wrapper.
+	 */
+	mtd_set_ecclayout(mtd, ecc->layout);
+
+	/*
 	 * If no default placement scheme is given, select an appropriate one.
 	 */
-	if (!ecc->layout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
+	if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
 		switch (mtd->oobsize) {
 		case 8:
-			ecc->layout = &nand_oob_8;
-			break;
 		case 16:
-			ecc->layout = &nand_oob_16;
+			mtd_set_ooblayout(mtd, &nand_ooblayout_sp_ops);
 			break;
 		case 64:
-			ecc->layout = &nand_oob_64;
-			break;
 		case 128:
-			ecc->layout = &nand_oob_128;
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 			break;
 		default:
 			pr_warn("No oob scheme defined for oobsize %d\n",
@@ -4288,7 +4333,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 		ecc->write_oob_raw = ecc->write_oob;
 
 	/* propagate ecc info to mtd_info */
-	mtd_set_ecclayout(mtd, ecc->layout);
 	mtd->ecc_strength = ecc->strength;
 	mtd->ecc_step_size = ecc->size;
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 7604f4b..82a005a 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -740,6 +740,9 @@ struct nand_chip {
 	void *priv;
 };
 
+extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;
+extern const struct mtd_ooblayout_ops nand_ooblayout_lp_ops;
+
 static inline void nand_set_flash_node(struct nand_chip *chip,
 				       struct device_node *np)
 {
-- 
2.1.4





  

    
[PATCH v3 22/52] mtd: nand: bch: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:03:08 
    

  

  
Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/nand_bch.c | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c
index b3039de..e29e75f 100644
--- a/drivers/mtd/nand/nand_bch.c
+++ b/drivers/mtd/nand/nand_bch.c
@@ -32,13 +32,11 @@
 /**
  * struct nand_bch_control - private NAND BCH control structure
  * @bch:       BCH control structure
- * @ecclayout: private ecc layout for this BCH configuration
  * @errloc:    error location array
  * @eccmask:   XOR ecc mask, allows erased pages to be decoded as valid
  */
 struct nand_bch_control {
 	struct bch_control   *bch;
-	struct nand_ecclayout ecclayout;
 	unsigned int         *errloc;
 	unsigned char        *eccmask;
 };
@@ -124,7 +122,6 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand = mtd_to_nand(mtd);
 	unsigned int m, t, eccsteps, i;
-	struct nand_ecclayout *layout = nand->ecc.layout;
 	struct nand_bch_control *nbc = NULL;
 	unsigned char *erased_page;
 	unsigned int eccsize = nand->ecc.size;
@@ -161,8 +158,17 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 
 	eccsteps = mtd->writesize/eccsize;
 
+	/*
+	 * Rely on the default ecclayout to ooblayout wrapper provided by MTD
+	 * core if ecc.layout is not NULL.
+	 * FIXME: this should be removed when all callers have moved to the
+	 * mtd_ooblayout_ops approach.
+	 */
+	if (nand->ecc.layout)
+		mtd_set_ecclayout(mtd, nand->ecc.layout);
+
 	/* if no ecc placement scheme was provided, build one */
-	if (!layout) {
+	if (!mtd->ooblayout) {
 
 		/* handle large page devices only */
 		if (mtd->oobsize < 64) {
@@ -171,24 +177,7 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 			goto fail;
 		}
 
-		layout = &nbc->ecclayout;
-		layout->eccbytes = eccsteps*eccbytes;
-
-		/* reserve 2 bytes for bad block marker */
-		if (layout->eccbytes+2 > mtd->oobsize) {
-			printk(KERN_WARNING "no suitable oob scheme available "
-			       "for oobsize %d eccbytes %u\n", mtd->oobsize,
-			       eccbytes);
-			goto fail;
-		}
-		/* put ecc bytes at oob tail */
-		for (i = 0; i < layout->eccbytes; i++)
-			layout->eccpos[i] = mtd->oobsize-layout->eccbytes+i;
-
-		layout->oobfree[0].offset = 2;
-		layout->oobfree[0].length = mtd->oobsize-2-layout->eccbytes;
-
-		nand->ecc.layout = layout;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 	}
 
 	/* sanity checks */
-- 
2.1.4





  

    
[PATCH v3 23/52] mtd: nand: sharpsl: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:03:15 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 arch/arm/mach-pxa/spitz.c   | 55 ++++++++++++++++++++++++++++++++++++---------
 drivers/mtd/nand/sharpsl.c  |  2 +-
 include/linux/mtd/sharpsl.h |  2 +-
 3 files changed, 47 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index 825f903..165a8db 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -763,14 +763,49 @@ static struct nand_bbt_descr spitz_nand_bbt = {
 	.pattern	= scan_ff_pattern
 };
 
-static struct nand_ecclayout akita_oobinfo = {
-	.oobfree	= { {0x08, 0x09} },
-	.eccbytes	= 24,
-	.eccpos		= {
-			0x05, 0x01, 0x02, 0x03, 0x06, 0x07, 0x15, 0x11,
-			0x12, 0x13, 0x16, 0x17, 0x25, 0x21, 0x22, 0x23,
-			0x26, 0x27, 0x35, 0x31, 0x32, 0x33, 0x36, 0x37,
-	},
+static int akita_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section > 12)
+		return -ERANGE;
+
+	switch (section % 3) {
+	case 0:
+		oobregion->offset = 5;
+		oobregion->length = 1;
+		break;
+
+	case 1:
+		oobregion->offset = 1;
+		oobregion->length = 3;
+		break;
+
+	case 2:
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		break;
+	}
+
+	oobregion->offset += (section / 3) * 0x10;
+
+	return 0;
+}
+
+static int akita_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops akita_ooblayout_ops = {
+	.ecc = akita_ooblayout_ecc,
+	.free = akita_ooblayout_free,
 };
 
 static struct sharpsl_nand_platform_data spitz_nand_pdata = {
@@ -804,11 +839,11 @@ static void __init spitz_nand_init(void)
 	} else if (machine_is_akita()) {
 		spitz_nand_partitions[1].size = 58 * 1024 * 1024;
 		spitz_nand_bbt.len = 1;
-		spitz_nand_pdata.ecc_layout = &akita_oobinfo;
+		spitz_nand_pdata.ecc_layout = &akita_ooblayout_ops;
 	} else if (machine_is_borzoi()) {
 		spitz_nand_partitions[1].size = 32 * 1024 * 1024;
 		spitz_nand_bbt.len = 1;
-		spitz_nand_pdata.ecc_layout = &akita_oobinfo;
+		spitz_nand_pdata.ecc_layout = &akita_ooblayout_ops;
 	}
 
 	platform_device_register(&spitz_nand_device);
diff --git a/drivers/mtd/nand/sharpsl.c b/drivers/mtd/nand/sharpsl.c
index b7d1b55..064ca17 100644
--- a/drivers/mtd/nand/sharpsl.c
+++ b/drivers/mtd/nand/sharpsl.c
@@ -148,6 +148,7 @@ static int sharpsl_nand_probe(struct platform_device *pdev)
 	/* Link the private data with the MTD structure */
 	mtd = nand_to_mtd(this);
 	mtd->dev.parent = &pdev->dev;
+	mtd_set_ooblayout(mtd, data->ecc_layout);
 
 	platform_set_drvdata(pdev, sharpsl);
 
@@ -170,7 +171,6 @@ static int sharpsl_nand_probe(struct platform_device *pdev)
 	this->ecc.bytes = 3;
 	this->ecc.strength = 1;
 	this->badblock_pattern = data->badblock_pattern;
-	this->ecc.layout = data->ecc_layout;
 	this->ecc.hwctl = sharpsl_nand_enable_hwecc;
 	this->ecc.calculate = sharpsl_nand_calculate_ecc;
 	this->ecc.correct = nand_correct_data;
diff --git a/include/linux/mtd/sharpsl.h b/include/linux/mtd/sharpsl.h
index 25f4d2a..65e91d0 100644
--- a/include/linux/mtd/sharpsl.h
+++ b/include/linux/mtd/sharpsl.h
@@ -14,7 +14,7 @@
 
 struct sharpsl_nand_platform_data {
 	struct nand_bbt_descr	*badblock_pattern;
-	struct nand_ecclayout	*ecc_layout;
+	const struct mtd_ooblayout_ops *ecc_layout;
 	struct mtd_partition	*partitions;
 	unsigned int		nr_partitions;
 };
-- 
2.1.4





  

    
[PATCH v3 24/52] mtd: nand: jz4740: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:03:25 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 arch/mips/include/asm/mach-jz4740/jz4740_nand.h |  2 +-
 arch/mips/jz4740/board-qi_lb60.c                | 87 +++++++++++++++----------
 drivers/mtd/nand/jz4740_nand.c                  |  2 +-
 3 files changed, 53 insertions(+), 38 deletions(-)

diff --git a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
index 398733e..7f7b0fc 100644
--- a/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
+++ b/arch/mips/include/asm/mach-jz4740/jz4740_nand.h
@@ -27,7 +27,7 @@ struct jz_nand_platform_data {
 
 	unsigned char banks[JZ_NAND_NUM_BANKS];
 
-	void (*ident_callback)(struct platform_device *, struct nand_chip *,
+	void (*ident_callback)(struct platform_device *, struct mtd_info *,
 				struct mtd_partition **, int *num_partitions);
 };
 
diff --git a/arch/mips/jz4740/board-qi_lb60.c b/arch/mips/jz4740/board-qi_lb60.c
index 934b15b..a1c1afb 100644
--- a/arch/mips/jz4740/board-qi_lb60.c
+++ b/arch/mips/jz4740/board-qi_lb60.c
@@ -50,20 +50,6 @@ static bool is_avt2;
 #define QI_LB60_GPIO_KEYIN8		JZ_GPIO_PORTD(26)
 
 /* NAND */
-static struct nand_ecclayout qi_lb60_ecclayout_1gb = {
-	.eccbytes = 36,
-	.eccpos = {
-		6,  7,	8,  9,	10, 11, 12, 13,
-		14, 15, 16, 17, 18, 19, 20, 21,
-		22, 23, 24, 25, 26, 27, 28, 29,
-		30, 31, 32, 33, 34, 35, 36, 37,
-		38, 39, 40, 41
-	},
-	.oobfree = {
-		{ .offset = 2, .length = 4 },
-		{ .offset = 42, .length = 22 }
-	},
-};
 
 /* Early prototypes of the QI LB60 had only 1GB of NAND.
  * In order to support these devices as well the partition and ecc layout is
@@ -86,25 +72,6 @@ static struct mtd_partition qi_lb60_partitions_1gb[] = {
 	},
 };
 
-static struct nand_ecclayout qi_lb60_ecclayout_2gb = {
-	.eccbytes = 72,
-	.eccpos = {
-		12, 13, 14, 15, 16, 17, 18, 19,
-		20, 21, 22, 23, 24, 25, 26, 27,
-		28, 29, 30, 31, 32, 33, 34, 35,
-		36, 37, 38, 39, 40, 41, 42, 43,
-		44, 45, 46, 47, 48, 49, 50, 51,
-		52, 53, 54, 55, 56, 57, 58, 59,
-		60, 61, 62, 63, 64, 65, 66, 67,
-		68, 69, 70, 71, 72, 73, 74, 75,
-		76, 77, 78, 79, 80, 81, 82, 83
-	},
-	.oobfree = {
-		{ .offset = 2, .length = 10 },
-		{ .offset = 84, .length = 44 },
-	},
-};
-
 static struct mtd_partition qi_lb60_partitions_2gb[] = {
 	{
 		.name = "NAND BOOT partition",
@@ -123,19 +90,67 @@ static struct mtd_partition qi_lb60_partitions_2gb[] = {
 	},
 };
 
+static int qi_lb60_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 36;
+	oobregion->offset = 6;
+
+	if (mtd->oobsize == 128) {
+		oobregion->length *= 2;
+		oobregion->offset *= 2;
+	}
+
+	return 0;
+}
+
+static int qi_lb60_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	int eccbytes = 36, eccoff = 6;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->oobsize == 128) {
+		eccbytes *= 2;
+		eccoff *= 2;
+	}
+
+	if (!section) {
+		oobregion->offset = 2;
+		oobregion->length = eccoff - 2;
+	} else {
+		oobregion->offset = eccoff + eccbytes;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops qi_lb60_ooblayout_ops = {
+	.ecc = qi_lb60_ooblayout_ecc,
+	.free = qi_lb60_ooblayout_free,
+};
+
 static void qi_lb60_nand_ident(struct platform_device *pdev,
-		struct nand_chip *chip, struct mtd_partition **partitions,
+		struct mtd_info *mtd, struct mtd_partition **partitions,
 		int *num_partitions)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
 	if (chip->page_shift == 12) {
-		chip->ecc.layout = &qi_lb60_ecclayout_2gb;
 		*partitions = qi_lb60_partitions_2gb;
 		*num_partitions = ARRAY_SIZE(qi_lb60_partitions_2gb);
 	} else {
-		chip->ecc.layout = &qi_lb60_ecclayout_1gb;
 		*partitions = qi_lb60_partitions_1gb;
 		*num_partitions = ARRAY_SIZE(qi_lb60_partitions_1gb);
 	}
+
+	mtd_set_ooblayout(mtd, &qi_lb60_ooblayout_ops);
 }
 
 static struct jz_nand_platform_data qi_lb60_nand_pdata = {
diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c
index 673ceb2..df74408 100644
--- a/drivers/mtd/nand/jz4740_nand.c
+++ b/drivers/mtd/nand/jz4740_nand.c
@@ -476,7 +476,7 @@ static int jz_nand_probe(struct platform_device *pdev)
 	}
 
 	if (pdata && pdata->ident_callback) {
-		pdata->ident_callback(pdev, chip, &pdata->partitions,
+		pdata->ident_callback(pdev, mtd, &pdata->partitions,
 					&pdata->num_partitions);
 	}
 
-- 
2.1.4





  

    
[PATCH v3 25/52] mtd: nand: atmel: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:03:59 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
 1 file changed, 38 insertions(+), 46 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index ac3dd3f..a922193 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
 	uint32_t rb_mask;
 };
 
-/* oob layout for large page size
+/*
+ * oob layout for large page size
  * bad block info is on bytes 0 and 1
  * the bytes have to be consecutives to avoid
  * several NAND_CMD_RNDOUT during read
- */
-static struct nand_ecclayout atmel_oobinfo_large = {
-	.eccbytes = 4,
-	.eccpos = {60, 61, 62, 63},
-	.oobfree = {
-		{2, 58}
-	},
-};
-
-/* oob layout for small page size
+ *
+ * oob layout for small page size
  * bad block info is on bytes 4 and 5
  * the bytes have to be consecutives to avoid
  * several NAND_CMD_RNDOUT during read
  */
-static struct nand_ecclayout atmel_oobinfo_small = {
-	.eccbytes = 4,
-	.eccpos = {0, 1, 2, 3},
-	.oobfree = {
-		{6, 10}
-	},
+static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 4;
+	oobregion->offset = 0;
+
+	return 0;
+}
+
+static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 6;
+	oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
+	.ecc = atmel_ooblayout_ecc_sp,
+	.free = atmel_ooblayout_free_sp,
 };
 
 struct atmel_nfc {
@@ -163,8 +177,6 @@ struct atmel_nand_host {
 	int			*pmecc_delta;
 };
 
-static struct nand_ecclayout atmel_pmecc_oobinfo;
-
 /*
  * Enable NAND.
  */
@@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
 	return (m * cap + 7) / 8;
 }
 
-static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
-				    int oobsize, int ecc_len)
-{
-	int i;
-
-	layout->eccbytes = ecc_len;
-
-	/* ECC will occupy the last ecc_len bytes continuously */
-	for (i = 0; i < ecc_len; i++)
-		layout->eccpos[i] = oobsize - ecc_len + i;
-
-	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
-	layout->oobfree[0].length =
-		oobsize - ecc_len - layout->oobfree[0].offset;
-}
-
 static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
 {
 	int table_size;
@@ -1010,8 +1006,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd_to_nand(mtd);
 	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
+	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
 	uint32_t val = 0;
-	struct nand_ecclayout *ecc_layout;
 	struct mtd_oob_region oobregion;
 
 	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
@@ -1062,12 +1058,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 		| PMECC_CFG_AUTO_DISABLE);
 	pmecc_writel(host->ecc, CFG, val);
 
-	ecc_layout = nand_chip->ecc.layout;
 	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
 	mtd_ooblayout_ecc(mtd, 0, &oobregion);
 	pmecc_writel(host->ecc, SADDR, oobregion.offset);
 	pmecc_writel(host->ecc, EADDR,
-		     oobregion.offset + ecc_layout->eccbytes - 1);
+		     oobregion.offset + eccbytes - 1);
 	/* See datasheet about PMECC Clock Control Register */
 	pmecc_writel(host->ecc, CLK, 2);
 	pmecc_writel(host->ecc, IDR, 0xff);
@@ -1289,11 +1284,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
 			err_no = -EINVAL;
 			goto err;
 		}
-		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
-					mtd->oobsize,
-					nand_chip->ecc.total);
 
-		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		break;
 	default:
 		dev_warn(host->dev,
@@ -1641,19 +1633,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
 	/* set ECC page size and oob layout */
 	switch (mtd->writesize) {
 	case 512:
-		nand_chip->ecc.layout = &atmel_oobinfo_small;
+		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
 		break;
 	case 1024:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
 		break;
 	case 2048:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
 		break;
 	case 4096:
-		nand_chip->ecc.layout = &atmel_oobinfo_large;
+		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
 		break;
 	default:
-- 
2.1.4





  

    
[PATCH v3 27/52] mtd: nand: brcm: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:04:16 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/brcmnand/brcmnand.c | 258 +++++++++++++++++++++--------------
 1 file changed, 157 insertions(+), 101 deletions(-)

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index e052839..4c3c0a9 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -781,127 +781,183 @@ static inline bool is_hamming_ecc(struct brcmnand_cfg *cfg)
 }
 
 /*
- * Returns a nand_ecclayout strucutre for the given layout/configuration.
- * Returns NULL on failure.
+ * Set mtd->ooblayout to the appropriate mtd_ooblayout_ops given
+ * the layout/configuration.
+ * Returns -ERRCODE on failure.
  */
-static struct nand_ecclayout *brcmnand_create_layout(int ecc_level,
-						     struct brcmnand_host *host)
+static int brcmnand_hamming_ooblayout_ecc(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
 	struct brcmnand_cfg *cfg = &host->hwcfg;
-	int i, j;
-	struct nand_ecclayout *layout;
-	int req;
-	int sectors;
-	int sas;
-	int idx1, idx2;
-
-	layout = devm_kzalloc(&host->pdev->dev, sizeof(*layout), GFP_KERNEL);
-	if (!layout)
-		return NULL;
-
-	sectors = cfg->page_size / (512 << cfg->sector_size_1k);
-	sas = cfg->spare_area_size << cfg->sector_size_1k;
-
-	/* Hamming */
-	if (is_hamming_ecc(cfg)) {
-		for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
-			/* First sector of each page may have BBI */
-			if (i == 0) {
-				layout->oobfree[idx2].offset = i * sas + 1;
-				/* Small-page NAND use byte 6 for BBI */
-				if (cfg->page_size == 512)
-					layout->oobfree[idx2].offset--;
-				layout->oobfree[idx2].length = 5;
-			} else {
-				layout->oobfree[idx2].offset = i * sas;
-				layout->oobfree[idx2].length = 6;
-			}
-			idx2++;
-			layout->eccpos[idx1++] = i * sas + 6;
-			layout->eccpos[idx1++] = i * sas + 7;
-			layout->eccpos[idx1++] = i * sas + 8;
-			layout->oobfree[idx2].offset = i * sas + 9;
-			layout->oobfree[idx2].length = 7;
-			idx2++;
-			/* Leave zero-terminated entry for OOBFREE */
-			if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
-				    idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
-				break;
-		}
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
 
-		return layout;
-	}
+	if (section >= sectors)
+		return -ERANGE;
 
-	/*
-	 * CONTROLLER_VERSION:
-	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
-	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
-	 * But we will just be conservative.
-	 */
-	req = DIV_ROUND_UP(ecc_level * 14, 8);
-	if (req >= sas) {
-		dev_err(&host->pdev->dev,
-			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
-			req, sas);
-		return NULL;
-	}
+	oobregion->offset = (section * sas) + 6;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int brcmnand_hamming_ooblayout_free(struct mtd_info *mtd, int section,
+					   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors * 2)
+		return -ERANGE;
 
-	layout->eccbytes = req * sectors;
-	for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) {
-		for (j = sas - req; j < sas && idx1 <
-				MTD_MAX_ECCPOS_ENTRIES_LARGE; j++, idx1++)
-			layout->eccpos[idx1] = i * sas + j;
+	oobregion->offset = (section / 2) * sas;
+
+	if (section & 1) {
+		oobregion->offset += 9;
+		oobregion->length = 7;
+	} else {
+		oobregion->length = 6;
 
 		/* First sector of each page may have BBI */
-		if (i == 0) {
-			if (cfg->page_size == 512 && (sas - req >= 6)) {
-				/* Small-page NAND use byte 6 for BBI */
-				layout->oobfree[idx2].offset = 0;
-				layout->oobfree[idx2].length = 5;
-				idx2++;
-				if (sas - req > 6) {
-					layout->oobfree[idx2].offset = 6;
-					layout->oobfree[idx2].length =
-						sas - req - 6;
-					idx2++;
-				}
-			} else if (sas > req + 1) {
-				layout->oobfree[idx2].offset = i * sas + 1;
-				layout->oobfree[idx2].length = sas - req - 1;
-				idx2++;
-			}
-		} else if (sas > req) {
-			layout->oobfree[idx2].offset = i * sas;
-			layout->oobfree[idx2].length = sas - req;
-			idx2++;
+		if (!section) {
+			/*
+			 * Small-page NAND use byte 6 for BBI while large-page
+			 * NAND use byte 0.
+			 */
+			if (cfg->page_size > 512)
+				oobregion->offset++;
+			oobregion->length--;
 		}
-		/* Leave zero-terminated entry for OOBFREE */
-		if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE ||
-				idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1)
-			break;
 	}
 
-	return layout;
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops brcmnand_hamming_ooblayout_ops = {
+	.ecc = brcmnand_hamming_ooblayout_ecc,
+	.free = brcmnand_hamming_ooblayout_free,
+};
+
+static int brcmnand_bch_ooblayout_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors)
+		return -ERANGE;
+
+	oobregion->offset = (section * (sas + 1)) - chip->ecc.bytes;
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
 }
 
-static struct nand_ecclayout *brcmstb_choose_ecc_layout(
-		struct brcmnand_host *host)
+static int brcmnand_bch_ooblayout_free_lp(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
+
+	if (section >= sectors)
+		return -ERANGE;
+
+	if (sas <= chip->ecc.bytes)
+		return 0;
+
+	oobregion->offset = section * sas;
+	oobregion->length = sas - chip->ecc.bytes;
+
+	if (!section) {
+		oobregion->offset++;
+		oobregion->length--;
+	}
+
+	return 0;
+}
+
+static int brcmnand_bch_ooblayout_free_sp(struct mtd_info *mtd, int section,
+					  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_cfg *cfg = &host->hwcfg;
+	int sas = cfg->spare_area_size << cfg->sector_size_1k;
+
+	if (section > 1 || sas - chip->ecc.bytes < 6 ||
+	    (section && sas - chip->ecc.bytes == 6))
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 5;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = sas - chip->ecc.bytes - 6;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops brcmnand_bch_lp_ooblayout_ops = {
+	.ecc = brcmnand_bch_ooblayout_ecc,
+	.free = brcmnand_bch_ooblayout_free_lp,
+};
+
+static const struct mtd_ooblayout_ops brcmnand_bch_sp_ooblayout_ops = {
+	.ecc = brcmnand_bch_ooblayout_ecc,
+	.free = brcmnand_bch_ooblayout_free_sp,
+};
+
+static int brcmstb_choose_ecc_layout(struct brcmnand_host *host)
 {
-	struct nand_ecclayout *layout;
 	struct brcmnand_cfg *p = &host->hwcfg;
+	struct mtd_info *mtd = nand_to_mtd(&host->chip);
+	struct nand_ecc_ctrl *ecc = &host->chip.ecc;
 	unsigned int ecc_level = p->ecc_level;
+	int sas = p->spare_area_size << p->sector_size_1k;
+	int sectors = p->page_size / (512 << p->sector_size_1k);
 
 	if (p->sector_size_1k)
 		ecc_level <<= 1;
 
-	layout = brcmnand_create_layout(ecc_level, host);
-	if (!layout) {
+	if (is_hamming_ecc(p)) {
+		ecc->bytes = 3 * sectors;
+		mtd_set_ooblayout(mtd, &brcmnand_hamming_ooblayout_ops);
+		return 0;
+	}
+
+	/*
+	 * CONTROLLER_VERSION:
+	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
+	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
+	 * But we will just be conservative.
+	 */
+	ecc->bytes = DIV_ROUND_UP(ecc_level * 14, 8);
+	if (p->page_size == 512)
+		mtd_set_ooblayout(mtd, &brcmnand_bch_sp_ooblayout_ops);
+	else
+		mtd_set_ooblayout(mtd, &brcmnand_bch_lp_ooblayout_ops);
+
+	if (ecc->bytes >= sas) {
 		dev_err(&host->pdev->dev,
-				"no proper ecc_layout for this NAND cfg\n");
-		return NULL;
+			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
+			ecc->bytes, sas);
+		return -EINVAL;
 	}
 
-	return layout;
+	return 0;
 }
 
 static void brcmnand_wp(struct mtd_info *mtd, int wp)
@@ -2011,9 +2067,9 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
 	/* only use our internal HW threshold */
 	mtd->bitflip_threshold = 1;
 
-	chip->ecc.layout = brcmstb_choose_ecc_layout(host);
-	if (!chip->ecc.layout)
-		return -ENXIO;
+	ret = brcmstb_choose_ecc_layout(host);
+	if (ret)
+		return ret;
 
 	if (nand_scan_tail(mtd))
 		return -ENXIO;
-- 
2.1.4





  

    
[PATCH v3 26/52] mtd: nand: bf5xx: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:04:17 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/bf5xx_nand.c | 51 ++++++++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 23 deletions(-)

diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index 7f6b30e..b38f414 100644
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -109,28 +109,33 @@ static const unsigned short bfin_nfc_pin_req[] =
 	 0};
 
 #ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
-static struct nand_ecclayout bootrom_ecclayout = {
-	.eccbytes = 24,
-	.eccpos = {
-		0x8 * 0, 0x8 * 0 + 1, 0x8 * 0 + 2,
-		0x8 * 1, 0x8 * 1 + 1, 0x8 * 1 + 2,
-		0x8 * 2, 0x8 * 2 + 1, 0x8 * 2 + 2,
-		0x8 * 3, 0x8 * 3 + 1, 0x8 * 3 + 2,
-		0x8 * 4, 0x8 * 4 + 1, 0x8 * 4 + 2,
-		0x8 * 5, 0x8 * 5 + 1, 0x8 * 5 + 2,
-		0x8 * 6, 0x8 * 6 + 1, 0x8 * 6 + 2,
-		0x8 * 7, 0x8 * 7 + 1, 0x8 * 7 + 2
-	},
-	.oobfree = {
-		{ 0x8 * 0 + 3, 5 },
-		{ 0x8 * 1 + 3, 5 },
-		{ 0x8 * 2 + 3, 5 },
-		{ 0x8 * 3 + 3, 5 },
-		{ 0x8 * 4 + 3, 5 },
-		{ 0x8 * 5 + 3, 5 },
-		{ 0x8 * 6 + 3, 5 },
-		{ 0x8 * 7 + 3, 5 },
-	}
+static int bootrom_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = section * 8;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int bootrom_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 7)
+		return -ERANGE;
+
+	oobregion->offset = (section * 8) + 3;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops bootrom_ooblayout_ops = {
+	.ecc = bootrom_ooblayout_ecc,
+	.free = bootrom_ooblayout_free,
 };
 #endif
 
@@ -800,7 +805,7 @@ static int bf5xx_nand_probe(struct platform_device *pdev)
 	/* setup hardware ECC data struct */
 	if (hardware_ecc) {
 #ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
-		chip->ecc.layout = &bootrom_ecclayout;
+		mtd_set_ooblayout(mtd, &bootrom_ooblayout_ops);
 #endif
 		chip->read_buf      = bf5xx_nand_dma_read_buf;
 		chip->write_buf     = bf5xx_nand_dma_write_buf;
-- 
2.1.4





  

    
[PATCH v3 28/52] mtd: nand: cafe: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:04:27 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/cafe_nand.c | 45 ++++++++++++++++++++++++++++++++------------
 1 file changed, 33 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
index aa1a616..0935b7c 100644
--- a/drivers/mtd/nand/cafe_nand.c
+++ b/drivers/mtd/nand/cafe_nand.c
@@ -459,10 +459,38 @@ static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 	return max_bitflips;
 }
 
-static struct nand_ecclayout cafe_oobinfo_2048 = {
-	.eccbytes = 14,
-	.eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
-	.oobfree = {{14, 50}}
+static int cafe_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = chip->ecc.steps * chip->ecc.bytes;
+
+	return 0;
+}
+
+static int cafe_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int eccbytes = chip->ecc.steps * chip->ecc.bytes;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = eccbytes;
+	oobregion->length = mtd->oobsize - eccbytes;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops cafe_ooblayout_ops = {
+	.ecc = cafe_ooblayout_ecc,
+	.free = cafe_ooblayout_free,
 };
 
 /* Ick. The BBT code really ought to be able to work this bit out
@@ -494,12 +522,6 @@ static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
 	.pattern = cafe_mirror_pattern_2048
 };
 
-static struct nand_ecclayout cafe_oobinfo_512 = {
-	.eccbytes = 14,
-	.eccpos = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
-	.oobfree = {{14, 2}}
-};
-
 static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
 	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
 		| NAND_BBT_2BIT | NAND_BBT_VERSION,
@@ -743,12 +765,11 @@ static int cafe_nand_probe(struct pci_dev *pdev,
 		cafe->ctl2 |= 1<<29; /* 2KiB page size */
 
 	/* Set up ECC according to the type of chip we found */
+	mtd_set_ooblayout(mtd, &cafe_ooblayout_ops);
 	if (mtd->writesize == 2048) {
-		cafe->nand.ecc.layout = &cafe_oobinfo_2048;
 		cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
 		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
 	} else if (mtd->writesize == 512) {
-		cafe->nand.ecc.layout = &cafe_oobinfo_512;
 		cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
 		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
 	} else {
-- 
2.1.4





  

    
[PATCH v3 29/52] mtd: nand: davinci: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:05:15 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/davinci_nand.c | 118 +++++++++++++++-------------------------
 1 file changed, 44 insertions(+), 74 deletions(-)

diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index 8cb821b..fe3fd29 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -54,7 +54,6 @@
  */
 struct davinci_nand_info {
 	struct nand_chip	chip;
-	struct nand_ecclayout	ecclayout;
 
 	struct device		*dev;
 	struct clk		*clk;
@@ -480,63 +479,46 @@ static int nand_davinci_dev_ready(struct mtd_info *mtd)
  * ten ECC bytes plus the manufacturer's bad block marker byte, and
  * and not overlapping the default BBT markers.
  */
-static struct nand_ecclayout hwecc4_small = {
-	.eccbytes = 10,
-	.eccpos = { 0, 1, 2, 3, 4,
-		/* offset 5 holds the badblock marker */
-		6, 7,
-		13, 14, 15, },
-	.oobfree = {
-		{.offset = 8, .length = 5, },
-		{.offset = 16, },
-	},
-};
+static int hwecc4_ooblayout_small_ecc(struct mtd_info *mtd, int section,
+				      struct mtd_oob_region *oobregion)
+{
+	if (section > 2)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 5;
+	} else if (section == 1) {
+		oobregion->offset = 6;
+		oobregion->length = 2;
+	} else {
+		oobregion->offset = 13;
+		oobregion->length = 3;
+	}
 
-/* An ECC layout for using 4-bit ECC with large-page (2048bytes) flash,
- * storing ten ECC bytes plus the manufacturer's bad block marker byte,
- * and not overlapping the default BBT markers.
- */
-static struct nand_ecclayout hwecc4_2048 = {
-	.eccbytes = 40,
-	.eccpos = {
-		/* at the end of spare sector */
-		24, 25, 26, 27, 28, 29,	30, 31, 32, 33,
-		34, 35, 36, 37, 38, 39,	40, 41, 42, 43,
-		44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
-		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
-		},
-	.oobfree = {
-		/* 2 bytes at offset 0 hold manufacturer badblock markers */
-		{.offset = 2, .length = 22, },
-		/* 5 bytes at offset 8 hold BBT markers */
-		/* 8 bytes at offset 16 hold JFFS2 clean markers */
-	},
-};
+	return 0;
+}
 
-/*
- * An ECC layout for using 4-bit ECC with large-page (4096bytes) flash,
- * storing ten ECC bytes plus the manufacturer's bad block marker byte,
- * and not overlapping the default BBT markers.
- */
-static struct nand_ecclayout hwecc4_4096 = {
-	.eccbytes = 80,
-	.eccpos = {
-		/* at the end of spare sector */
-		48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
-		58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
-		68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
-		78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
-		98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
-		108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
-		118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
-	},
-	.oobfree = {
-		/* 2 bytes at offset 0 hold manufacturer badblock markers */
-		{.offset = 2, .length = 46, },
-		/* 5 bytes at offset 8 hold BBT markers */
-		/* 8 bytes at offset 16 hold JFFS2 clean markers */
-	},
+static int hwecc4_ooblayout_small_free(struct mtd_info *mtd, int section,
+				       struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 8;
+		oobregion->length = 5;
+	} else {
+		oobregion->offset = 16;
+		oobregion->length = mtd->oobsize - 16;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops hwecc4_small_ooblayout_ops = {
+	.ecc = hwecc4_ooblayout_small_ecc,
+	.free = hwecc4_ooblayout_small_free,
 };
 
 #if defined(CONFIG_OF)
@@ -805,26 +787,14 @@ static int nand_davinci_probe(struct platform_device *pdev)
 		 * table marker fits in the free bytes.
 		 */
 		if (chunks == 1) {
-			info->ecclayout = hwecc4_small;
-			info->ecclayout.oobfree[1].length = mtd->oobsize - 16;
-			goto syndrome_done;
-		}
-		if (chunks == 4) {
-			info->ecclayout = hwecc4_2048;
+			mtd_set_ooblayout(mtd, &hwecc4_small_ooblayout_ops);
+		} else if (chunks == 4 || chunks == 8) {
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
 			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
-			goto syndrome_done;
-		}
-		if (chunks == 8) {
-			info->ecclayout = hwecc4_4096;
-			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
-			goto syndrome_done;
+		} else {
+			ret = -EIO;
+			goto err;
 		}
-
-		ret = -EIO;
-		goto err;
-
-syndrome_done:
-		info->chip.ecc.layout = &info->ecclayout;
 	}
 
 	ret = nand_scan_tail(mtd);
-- 
2.1.4





  

    
[PATCH v3 30/52] mtd: nand: denali: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:05:37 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/denali.c | 51 +++++++++++++++++++++++++++++++++--------------
 1 file changed, 36 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 30bf5f6..b832375 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1374,13 +1374,42 @@ static void denali_hw_init(struct denali_nand_info *denali)
  * correction
  */
 #define ECC_8BITS	14
-static struct nand_ecclayout nand_8bit_oob = {
-	.eccbytes = 14,
-};
-
 #define ECC_15BITS	26
-static struct nand_ecclayout nand_15bit_oob = {
-	.eccbytes = 26,
+
+static int denali_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = denali->bbtskipbytes;
+	oobregion->length = chip->ecc.bytes * chip->ecc.steps;
+
+	return 0;
+}
+
+static int denali_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int eccbytes = chip->ecc.bytes * chip->ecc.steps;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = eccbytes + denali->bbtskipbytes;
+	oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops denali_ooblayout_ops = {
+	.ecc = denali_ooblayout_ecc,
+	.free = denali_ooblayout_free,
 };
 
 static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -1561,7 +1590,6 @@ int denali_init(struct denali_nand_info *denali)
 			ECC_SECTOR_SIZE)))) {
 		/* if MLC OOB size is large enough, use 15bit ECC*/
 		denali->nand.ecc.strength = 15;
-		denali->nand.ecc.layout = &nand_15bit_oob;
 		denali->nand.ecc.bytes = ECC_15BITS;
 		iowrite32(15, denali->flash_reg + ECC_CORRECTION);
 	} else if (mtd->oobsize < (denali->bbtskipbytes +
@@ -1571,20 +1599,13 @@ int denali_init(struct denali_nand_info *denali)
 		goto failed_req_irq;
 	} else {
 		denali->nand.ecc.strength = 8;
-		denali->nand.ecc.layout = &nand_8bit_oob;
 		denali->nand.ecc.bytes = ECC_8BITS;
 		iowrite32(8, denali->flash_reg + ECC_CORRECTION);
 	}
 
+	mtd_set_ooblayout(mtd, &denali_ooblayout_ops);
 	denali->nand.ecc.bytes *= denali->devnum;
 	denali->nand.ecc.strength *= denali->devnum;
-	denali->nand.ecc.layout->eccbytes *=
-		mtd->writesize / ECC_SECTOR_SIZE;
-	denali->nand.ecc.layout->oobfree[0].offset =
-		denali->bbtskipbytes + denali->nand.ecc.layout->eccbytes;
-	denali->nand.ecc.layout->oobfree[0].length =
-		mtd->oobsize - denali->nand.ecc.layout->eccbytes -
-		denali->bbtskipbytes;
 
 	/*
 	 * Let driver know the total blocks number and how many blocks
-- 
2.1.4





  

    
[PATCH v3 31/52] mtd: nand: diskonchip: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:05:47 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/diskonchip.c | 60 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index f170f3c..4411e99 100644
--- a/drivers/mtd/nand/diskonchip.c
+++ b/drivers/mtd/nand/diskonchip.c
@@ -950,20 +950,50 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
 
 //u_char mydatabuf[528];
 
-/* The strange out-of-order .oobfree list below is a (possibly unneeded)
- * attempt to retain compatibility.  It used to read:
- * 	.oobfree = { {8, 8} }
- * Since that leaves two bytes unusable, it was changed.  But the following
- * scheme might affect existing jffs2 installs by moving the cleanmarker:
- * 	.oobfree = { {6, 10} }
- * jffs2 seems to handle the above gracefully, but the current scheme seems
- * safer.  The only problem with it is that any code that parses oobfree must
- * be able to handle out-of-order segments.
- */
-static struct nand_ecclayout doc200x_oobinfo = {
-	.eccbytes = 6,
-	.eccpos = {0, 1, 2, 3, 4, 5},
-	.oobfree = {{8, 8}, {6, 2}}
+static int doc200x_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 0;
+	oobregion->length = 6;
+
+	return 0;
+}
+
+static int doc200x_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	/*
+	 * The strange out-of-order free bytes definition is a (possibly
+	 * unneeded) attempt to retain compatibility.  It used to read:
+	 *	.oobfree = { {8, 8} }
+	 * Since that leaves two bytes unusable, it was changed.  But the
+	 * following scheme might affect existing jffs2 installs by moving the
+	 * cleanmarker:
+	 *	.oobfree = { {6, 10} }
+	 * jffs2 seems to handle the above gracefully, but the current scheme
+	 * seems safer. The only problem with it is that any code retrieving
+	 * free bytes position must be able to handle out-of-order segments.
+	 */
+	if (!section) {
+		oobregion->offset = 8;
+		oobregion->length = 8;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = 2;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops doc200x_ooblayout_ops = {
+	.ecc = doc200x_ooblayout_ecc,
+	.free = doc200x_ooblayout_free,
 };
 
 /* Find the (I)NFTL Media Header, and optionally also the mirror media header.
@@ -1537,6 +1567,7 @@ static int __init doc_probe(unsigned long physadr)
 	nand->bbt_md		= nand->bbt_td + 1;
 
 	mtd->owner		= THIS_MODULE;
+	mtd_set_ooblayout(mtd, &doc200x_ooblayout_ops);
 
 	nand_set_controller_data(nand, doc);
 	nand->select_chip	= doc200x_select_chip;
@@ -1548,7 +1579,6 @@ static int __init doc_probe(unsigned long physadr)
 	nand->ecc.calculate	= doc200x_calculate_ecc;
 	nand->ecc.correct	= doc200x_correct_data;
 
-	nand->ecc.layout	= &doc200x_oobinfo;
 	nand->ecc.mode		= NAND_ECC_HW_SYNDROME;
 	nand->ecc.size		= 512;
 	nand->ecc.bytes		= 6;
-- 
2.1.4





  

    
[PATCH v3 32/52] mtd: nand: docg4: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:06:12 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/docg4.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index fb46fd7..f5ca9a5 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -222,10 +222,33 @@ struct docg4_priv {
  * Bytes 8 - 14 are hw-generated ecc covering entire page + oob bytes 0 - 14.
  * Byte 15 (the last) is used by the driver as a "page written" flag.
  */
-static struct nand_ecclayout docg4_oobinfo = {
-	.eccbytes = 9,
-	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {.offset = 2, .length = 5} }
+static int docg4_ooblayout_ecc(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 7;
+	oobregion->length = 9;
+
+	return 0;
+}
+
+static int docg4_ooblayout_free(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 2;
+	oobregion->length = 5;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops docg4_ooblayout_ops = {
+	.ecc = docg4_ooblayout_ecc,
+	.free = docg4_ooblayout_free,
 };
 
 /*
@@ -1209,6 +1232,7 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	mtd->writesize = DOCG4_PAGE_SIZE;
 	mtd->erasesize = DOCG4_BLOCK_SIZE;
 	mtd->oobsize = DOCG4_OOB_SIZE;
+	mtd_set_ooblayout(mtd, &docg4_ooblayout_ops);
 	nand->chipsize = DOCG4_CHIP_SIZE;
 	nand->chip_shift = DOCG4_CHIP_SHIFT;
 	nand->bbt_erase_shift = nand->phys_erase_shift = DOCG4_ERASE_SHIFT;
@@ -1217,7 +1241,6 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	nand->pagemask = 0x3ffff;
 	nand->badblockpos = NAND_LARGE_BADBLOCK_POS;
 	nand->badblockbits = 8;
-	nand->ecc.layout = &docg4_oobinfo;
 	nand->ecc.mode = NAND_ECC_HW_SYNDROME;
 	nand->ecc.size = DOCG4_PAGE_SIZE;
 	nand->ecc.prepad = 8;
-- 
2.1.4





  

    
[PATCH v3 33/52] mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:06:23 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/fsl_elbc_nand.c | 83 +++++++++++++++++++++++-----------------
 1 file changed, 47 insertions(+), 36 deletions(-)

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 059d5f7..487eae0 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -79,32 +79,53 @@ struct fsl_elbc_fcm_ctrl {
 
 /* These map to the positions used by the FCM hardware ECC generator */
 
-/* Small Page FLASH with FMR[ECCM] = 0 */
-static struct nand_ecclayout fsl_elbc_oob_sp_eccm0 = {
-	.eccbytes = 3,
-	.eccpos = {6, 7, 8},
-	.oobfree = { {0, 5}, {9, 7} },
-};
+static int fsl_elbc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 
-/* Small Page FLASH with FMR[ECCM] = 1 */
-static struct nand_ecclayout fsl_elbc_oob_sp_eccm1 = {
-	.eccbytes = 3,
-	.eccpos = {8, 9, 10},
-	.oobfree = { {0, 5}, {6, 2}, {11, 5} },
-};
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
 
-/* Large Page FLASH with FMR[ECCM] = 0 */
-static struct nand_ecclayout fsl_elbc_oob_lp_eccm0 = {
-	.eccbytes = 12,
-	.eccpos = {6, 7, 8, 22, 23, 24, 38, 39, 40, 54, 55, 56},
-	.oobfree = { {1, 5}, {9, 13}, {25, 13}, {41, 13}, {57, 7} },
-};
+	oobregion->offset = (16 * section) + 6;
+	if (priv->fmr & FMR_ECCM)
+		oobregion->offset += 2;
 
-/* Large Page FLASH with FMR[ECCM] = 1 */
-static struct nand_ecclayout fsl_elbc_oob_lp_eccm1 = {
-	.eccbytes = 12,
-	.eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
-	.oobfree = { {1, 7}, {11, 13}, {27, 13}, {43, 13}, {59, 5} },
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int fsl_elbc_ooblayout_free(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
+
+	if (section > chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		if (mtd->writesize > 512)
+			oobregion->offset++;
+		oobregion->length = (priv->fmr & FMR_ECCM) ? 7 : 5;
+	} else {
+		oobregion->offset = (16 * section) -
+				    ((priv->fmr & FMR_ECCM) ? 5 : 7);
+		if (section < chip->ecc.steps)
+			oobregion->length = 13;
+		else
+			oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsl_elbc_ooblayout_ops = {
+	.ecc = fsl_elbc_ooblayout_ecc,
+	.free = fsl_elbc_ooblayout_free,
 };
 
 /*
@@ -657,8 +678,8 @@ static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 	        chip->ecc.bytes);
 	dev_dbg(priv->dev, "fsl_elbc_init: nand->ecc.total = %d\n",
 	        chip->ecc.total);
-	dev_dbg(priv->dev, "fsl_elbc_init: nand->ecc.layout = %p\n",
-	        chip->ecc.layout);
+	dev_dbg(priv->dev, "fsl_elbc_init: mtd->ooblayout = %p\n",
+		mtd->ooblayout);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->flags = %08x\n", mtd->flags);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->size = %lld\n", mtd->size);
 	dev_dbg(priv->dev, "fsl_elbc_init: mtd->erasesize = %d\n",
@@ -675,14 +696,6 @@ static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 	} else if (mtd->writesize == 2048) {
 		priv->page_size = 1;
 		setbits32(&lbc->bank[priv->bank].or, OR_FCM_PGS);
-		/* adjust ecc setup if needed */
-		if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
-		    BR_DECC_CHK_GEN) {
-			chip->ecc.size = 512;
-			chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
-			                   &fsl_elbc_oob_lp_eccm1 :
-			                   &fsl_elbc_oob_lp_eccm0;
-		}
 	} else {
 		dev_err(priv->dev,
 		        "fsl_elbc_init: page size %d is not supported\n",
@@ -780,9 +793,7 @@ static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
 	if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
 	    BR_DECC_CHK_GEN) {
 		chip->ecc.mode = NAND_ECC_HW;
-		/* put in small page settings and adjust later if needed */
-		chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
-				&fsl_elbc_oob_sp_eccm1 : &fsl_elbc_oob_sp_eccm0;
+		mtd_set_ooblayout(mtd, &fsl_elbc_ooblayout_ops);
 		chip->ecc.size = 512;
 		chip->ecc.bytes = 3;
 		chip->ecc.strength = 1;
-- 
2.1.4





  

    
[PATCH v3 35/52] mtd: nand: fsmc: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:07:03 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/fsmc_nand.c | 298 ++++++++++++-------------------------------
 1 file changed, 82 insertions(+), 216 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 1bdcd4f..275a98c 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -39,212 +39,6 @@
 #include <linux/amba/bus.h>
 #include <mtd/mtd-abi.h>
 
-static struct nand_ecclayout fsmc_ecc1_128_layout = {
-	.eccbytes = 24,
-	.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52,
-		66, 67, 68, 82, 83, 84, 98, 99, 100, 114, 115, 116},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-		{.offset = 24, .length = 8},
-		{.offset = 40, .length = 8},
-		{.offset = 56, .length = 8},
-		{.offset = 72, .length = 8},
-		{.offset = 88, .length = 8},
-		{.offset = 104, .length = 8},
-		{.offset = 120, .length = 8}
-	}
-};
-
-static struct nand_ecclayout fsmc_ecc1_64_layout = {
-	.eccbytes = 12,
-	.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-		{.offset = 24, .length = 8},
-		{.offset = 40, .length = 8},
-		{.offset = 56, .length = 8},
-	}
-};
-
-static struct nand_ecclayout fsmc_ecc1_16_layout = {
-	.eccbytes = 3,
-	.eccpos = {2, 3, 4},
-	.oobfree = {
-		{.offset = 8, .length = 8},
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 8192 bytes & OOBsize 256 bytes. 13*16 bytes
- * of OB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 46
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_256_layout = {
-	.eccbytes = 208,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126,
-		130, 131, 132, 133, 134, 135, 136,
-		137, 138, 139, 140, 141, 142,
-		146, 147, 148, 149, 150, 151, 152,
-		153, 154, 155, 156, 157, 158,
-		162, 163, 164, 165, 166, 167, 168,
-		169, 170, 171, 172, 173, 174,
-		178, 179, 180, 181, 182, 183, 184,
-		185, 186, 187, 188, 189, 190,
-		194, 195, 196, 197, 198, 199, 200,
-		201, 202, 203, 204, 205, 206,
-		210, 211, 212, 213, 214, 215, 216,
-		217, 218, 219, 220, 221, 222,
-		226, 227, 228, 229, 230, 231, 232,
-		233, 234, 235, 236, 237, 238,
-		242, 243, 244, 245, 246, 247, 248,
-		249, 250, 251, 252, 253, 254
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 3},
-		{.offset = 143, .length = 3},
-		{.offset = 159, .length = 3},
-		{.offset = 175, .length = 3},
-		{.offset = 191, .length = 3},
-		{.offset = 207, .length = 3},
-		{.offset = 223, .length = 3},
-		{.offset = 239, .length = 3},
-		{.offset = 255, .length = 1}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 224 bytes. 13*8 bytes
- * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 118
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_224_layout = {
-	.eccbytes = 104,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 97}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 128 bytes. 13*8 bytes
- * of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 22
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_128_layout = {
-	.eccbytes = 104,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-		66,  67,  68,  69,  70,  71,  72,
-		73,  74,  75,  76,  77,  78,
-		82,  83,  84,  85,  86,  87,  88,
-		89,  90,  91,  92,  93,  94,
-		98,  99, 100, 101, 102, 103, 104,
-		105, 106, 107, 108, 109, 110,
-		114, 115, 116, 117, 118, 119, 120,
-		121, 122, 123, 124, 125, 126
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 3},
-		{.offset = 79, .length = 3},
-		{.offset = 95, .length = 3},
-		{.offset = 111, .length = 3},
-		{.offset = 127, .length = 1}
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 2048 bytes & OOBsize 64 bytes. 13*4 bytes of
- * OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 10
- * bytes are free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_64_layout = {
-	.eccbytes = 52,
-	.eccpos = {  2,   3,   4,   5,   6,   7,   8,
-		9,  10,  11,  12,  13,  14,
-		18,  19,  20,  21,  22,  23,  24,
-		25,  26,  27,  28,  29,  30,
-		34,  35,  36,  37,  38,  39,  40,
-		41,  42,  43,  44,  45,  46,
-		50,  51,  52,  53,  54,  55,  56,
-		57,  58,  59,  60,  61,  62,
-	},
-	.oobfree = {
-		{.offset = 15, .length = 3},
-		{.offset = 31, .length = 3},
-		{.offset = 47, .length = 3},
-		{.offset = 63, .length = 1},
-	}
-};
-
-/*
- * ECC4 layout for NAND of pagesize 512 bytes & OOBsize 16 bytes. 13 bytes of
- * OOB size is reserved for ECC, Byte no. 4 & 5 reserved for bad block and One
- * byte is free for use.
- */
-static struct nand_ecclayout fsmc_ecc4_16_layout = {
-	.eccbytes = 13,
-	.eccpos = { 0,  1,  2,  3,  6,  7, 8,
-		9, 10, 11, 12, 13, 14
-	},
-	.oobfree = {
-		{.offset = 15, .length = 1},
-	}
-};
-
 /*
  * ECC placement definitions in oobfree type format.
  * There are 13 bytes of ecc for every 512 byte block and it has to be read
@@ -274,6 +68,84 @@ static struct fsmc_eccplace fsmc_ecc4_sp_place = {
 	}
 };
 
+static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 2;
+	oobregion->length = 3;
+
+	return 0;
+}
+
+static int fsmc_ecc1_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 8;
+
+	if (section < chip->ecc.steps - 1)
+		oobregion->length = 8;
+	else
+		oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
+	.ecc = fsmc_ecc1_ooblayout_ecc,
+	.free = fsmc_ecc1_ooblayout_free,
+};
+
+static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
+				   struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->length = chip->ecc.bytes;
+
+	if (!section && mtd->writesize <= 512)
+		oobregion->offset = 0;
+	else
+		oobregion->offset = (section * 16) + 2;
+
+	return 0;
+}
+
+static int fsmc_ecc4_ooblayout_free(struct mtd_info *mtd, int section,
+				    struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 15;
+
+	if (section < chip->ecc.steps - 1)
+		oobregion->length = 3;
+	else
+		oobregion->length = mtd->oobsize - oobregion->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
+	.ecc = fsmc_ecc4_ooblayout_ecc,
+	.free = fsmc_ecc4_ooblayout_free,
+};
+
 /**
  * struct fsmc_nand_data - structure for FSMC NAND device state
  *
@@ -1084,23 +956,18 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	if (AMBA_REV_BITS(host->pid) >= 8) {
 		switch (mtd->oobsize) {
 		case 16:
-			nand->ecc.layout = &fsmc_ecc4_16_layout;
 			host->ecc_place = &fsmc_ecc4_sp_place;
 			break;
 		case 64:
-			nand->ecc.layout = &fsmc_ecc4_64_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 128:
-			nand->ecc.layout = &fsmc_ecc4_128_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 224:
-			nand->ecc.layout = &fsmc_ecc4_224_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		case 256:
-			nand->ecc.layout = &fsmc_ecc4_256_layout;
 			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		default:
@@ -1109,6 +976,8 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 			ret = -EINVAL;
 			goto err_probe;
 		}
+
+		mtd_set_ooblayout(mtd, &fsmc_ecc4_ooblayout_ops);
 	} else {
 		switch (nand->ecc.mode) {
 		case NAND_ECC_HW:
@@ -1135,13 +1004,10 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 		if (nand->ecc.mode != NAND_ECC_SOFT_BCH) {
 			switch (mtd->oobsize) {
 			case 16:
-				nand->ecc.layout = &fsmc_ecc1_16_layout;
-				break;
 			case 64:
-				nand->ecc.layout = &fsmc_ecc1_64_layout;
-				break;
 			case 128:
-				nand->ecc.layout = &fsmc_ecc1_128_layout;
+				mtd_set_ooblayout(mtd,
+						  &fsmc_ecc1_ooblayout_ops);
 				break;
 			default:
 				dev_warn(&pdev->dev,
-- 
2.1.4





  

    
[PATCH v3 34/52] mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:07:06 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/fsl_ifc_nand.c | 231 ++++++++++++----------------------------
 1 file changed, 67 insertions(+), 164 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index 2e970ac..83331df 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -67,136 +67,6 @@ struct fsl_ifc_nand_ctrl {
 
 static struct fsl_ifc_nand_ctrl *ifc_nand_ctrl;
 
-/* 512-byte page with 4-bit ECC, 8-bit */
-static struct nand_ecclayout oob_512_8bit_ecc4 = {
-	.eccbytes = 8,
-	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {0, 5}, {6, 2} },
-};
-
-/* 512-byte page with 4-bit ECC, 16-bit */
-static struct nand_ecclayout oob_512_16bit_ecc4 = {
-	.eccbytes = 8,
-	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
-	.oobfree = { {2, 6}, },
-};
-
-/* 2048-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_2048_ecc4 = {
-	.eccbytes = 32,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-	},
-	.oobfree = { {2, 6}, {40, 24} },
-};
-
-/* 4096-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_4096_ecc4 = {
-	.eccbytes = 64,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-	},
-	.oobfree = { {2, 6}, {72, 56} },
-};
-
-/* 4096-byte page size with 8-bit ECC -- requires 218-byte OOB */
-static struct nand_ecclayout oob_4096_ecc8 = {
-	.eccbytes = 128,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-	},
-	.oobfree = { {2, 6}, {136, 82} },
-};
-
-/* 8192-byte page size with 4-bit ECC */
-static struct nand_ecclayout oob_8192_ecc4 = {
-	.eccbytes = 128,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-	},
-	.oobfree = { {2, 6}, {136, 208} },
-};
-
-/* 8192-byte page size with 8-bit ECC -- requires 218-byte OOB */
-static struct nand_ecclayout oob_8192_ecc8 = {
-	.eccbytes = 256,
-	.eccpos = {
-		8, 9, 10, 11, 12, 13, 14, 15,
-		16, 17, 18, 19, 20, 21, 22, 23,
-		24, 25, 26, 27, 28, 29, 30, 31,
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63,
-		64, 65, 66, 67, 68, 69, 70, 71,
-		72, 73, 74, 75, 76, 77, 78, 79,
-		80, 81, 82, 83, 84, 85, 86, 87,
-		88, 89, 90, 91, 92, 93, 94, 95,
-		96, 97, 98, 99, 100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127,
-		128, 129, 130, 131, 132, 133, 134, 135,
-		136, 137, 138, 139, 140, 141, 142, 143,
-		144, 145, 146, 147, 148, 149, 150, 151,
-		152, 153, 154, 155, 156, 157, 158, 159,
-		160, 161, 162, 163, 164, 165, 166, 167,
-		168, 169, 170, 171, 172, 173, 174, 175,
-		176, 177, 178, 179, 180, 181, 182, 183,
-		184, 185, 186, 187, 188, 189, 190, 191,
-		192, 193, 194, 195, 196, 197, 198, 199,
-		200, 201, 202, 203, 204, 205, 206, 207,
-		208, 209, 210, 211, 212, 213, 214, 215,
-		216, 217, 218, 219, 220, 221, 222, 223,
-		224, 225, 226, 227, 228, 229, 230, 231,
-		232, 233, 234, 235, 236, 237, 238, 239,
-		240, 241, 242, 243, 244, 245, 246, 247,
-		248, 249, 250, 251, 252, 253, 254, 255,
-		256, 257, 258, 259, 260, 261, 262, 263,
-	},
-	.oobfree = { {2, 6}, {264, 80} },
-};
-
 /*
  * Generic flash bbt descriptors
  */
@@ -223,6 +93,58 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 	.pattern = mirror_pattern,
 };
 
+static int fsl_ifc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = 8;
+	oobregion->length = chip->ecc.bytes * chip->ecc.steps;
+
+	return 0;
+}
+
+static int fsl_ifc_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int eccbytes = chip->ecc.bytes * chip->ecc.steps;
+
+	if (section > 1)
+		return -ERANGE;
+
+	if (mtd->writesize == 512 &&
+	    !(chip->options & NAND_BUSWIDTH_16)) {
+		if (!section) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 6;
+			oobregion->length = 2;
+		}
+
+		return 0;
+	}
+
+	if (!section) {
+		oobregion->offset = 2;
+		oobregion->length = 6;
+	} else {
+		oobregion->offset = eccbytes + 8;
+		oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops fsl_ifc_ooblayout_ops = {
+	.ecc = fsl_ifc_ooblayout_ecc,
+	.free = fsl_ifc_ooblayout_free,
+};
+
 /*
  * Set up the IFC hardware block and page address fields, and the ifc nand
  * structure addr field to point to the correct IFC buffer in memory
@@ -812,8 +734,8 @@ static int fsl_ifc_chip_init_tail(struct mtd_info *mtd)
 							chip->ecc.bytes);
 	dev_dbg(priv->dev, "%s: nand->ecc.total = %d\n", __func__,
 							chip->ecc.total);
-	dev_dbg(priv->dev, "%s: nand->ecc.layout = %p\n", __func__,
-							chip->ecc.layout);
+	dev_dbg(priv->dev, "%s: mtd->ooblayout = %p\n", __func__,
+							mtd->ooblayout);
 	dev_dbg(priv->dev, "%s: mtd->flags = %08x\n", __func__, mtd->flags);
 	dev_dbg(priv->dev, "%s: mtd->size = %lld\n", __func__, mtd->size);
 	dev_dbg(priv->dev, "%s: mtd->erasesize = %d\n", __func__,
@@ -881,7 +803,6 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
 	struct nand_chip *chip = &priv->chip;
 	struct mtd_info *mtd = nand_to_mtd(&priv->chip);
-	struct nand_ecclayout *layout;
 	u32 csor;
 
 	/* Fill in fsl_ifc_mtd structure */
@@ -925,18 +846,9 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 
 	csor = ifc_in32(&ifc->csor_cs[priv->bank].csor);
 
-	/* Hardware generates ECC per 512 Bytes */
-	chip->ecc.size = 512;
-	chip->ecc.bytes = 8;
-	chip->ecc.strength = 4;
-
 	switch (csor & CSOR_NAND_PGS_MASK) {
 	case CSOR_NAND_PGS_512:
-		if (chip->options & NAND_BUSWIDTH_16) {
-			layout = &oob_512_16bit_ecc4;
-		} else {
-			layout = &oob_512_8bit_ecc4;
-
+		if (!(chip->options & NAND_BUSWIDTH_16)) {
 			/* Avoid conflict with bad block marker */
 			bbt_main_descr.offs = 0;
 			bbt_mirror_descr.offs = 0;
@@ -946,35 +858,16 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 		break;
 
 	case CSOR_NAND_PGS_2K:
-		layout = &oob_2048_ecc4;
 		priv->bufnum_mask = 3;
 		break;
 
 	case CSOR_NAND_PGS_4K:
-		if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
-		    CSOR_NAND_ECC_MODE_4) {
-			layout = &oob_4096_ecc4;
-		} else {
-			layout = &oob_4096_ecc8;
-			chip->ecc.bytes = 16;
-			chip->ecc.strength = 8;
-		}
-
 		priv->bufnum_mask = 1;
 		break;
 
 	case CSOR_NAND_PGS_8K:
-		if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
-		    CSOR_NAND_ECC_MODE_4) {
-			layout = &oob_8192_ecc4;
-		} else {
-			layout = &oob_8192_ecc8;
-			chip->ecc.bytes = 16;
-			chip->ecc.strength = 8;
-		}
-
 		priv->bufnum_mask = 0;
-	break;
+		break;
 
 	default:
 		dev_err(priv->dev, "bad csor %#x: bad page size\n", csor);
@@ -984,7 +877,17 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 	/* Must also set CSOR_NAND_ECC_ENC_EN if DEC_EN set */
 	if (csor & CSOR_NAND_ECC_DEC_EN) {
 		chip->ecc.mode = NAND_ECC_HW;
-		chip->ecc.layout = layout;
+		mtd_set_ooblayout(mtd, &fsl_ifc_ooblayout_ops);
+
+		/* Hardware generates ECC per 512 Bytes */
+		chip->ecc.size = 512;
+		if ((csor & CSOR_NAND_ECC_MODE_MASK) == CSOR_NAND_ECC_MODE_4) {
+			chip->ecc.bytes = 8;
+			chip->ecc.strength = 4;
+		} else {
+			chip->ecc.bytes = 16;
+			chip->ecc.strength = 8;
+		}
 	} else {
 		chip->ecc.mode = NAND_ECC_SOFT;
 	}
-- 
2.1.4





  

    
[PATCH v3 36/52] mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:07:20 
    

  

  
Now that mtd_ooblayout_ecc() returns the ECC byte position using the
OOB free method, we can get rid of the fsmc_nand_eccplace struct.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/fsmc_nand.c | 60 +++++++++++---------------------------------
 include/linux/mtd/fsmc.h     | 18 -------------
 2 files changed, 15 insertions(+), 63 deletions(-)

diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 275a98c..1372040 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -39,35 +39,6 @@
 #include <linux/amba/bus.h>
 #include <mtd/mtd-abi.h>
 
-/*
- * ECC placement definitions in oobfree type format.
- * There are 13 bytes of ecc for every 512 byte block and it has to be read
- * consecutively and immediately after the 512 byte data block for hardware to
- * generate the error bit offsets in 512 byte data.
- * Managing the ecc bytes in the following way makes it easier for software to
- * read ecc bytes consecutive to data bytes. This way is similar to
- * oobfree structure maintained already in generic nand driver
- */
-static struct fsmc_eccplace fsmc_ecc4_lp_place = {
-	.eccplace = {
-		{.offset = 2, .length = 13},
-		{.offset = 18, .length = 13},
-		{.offset = 34, .length = 13},
-		{.offset = 50, .length = 13},
-		{.offset = 66, .length = 13},
-		{.offset = 82, .length = 13},
-		{.offset = 98, .length = 13},
-		{.offset = 114, .length = 13}
-	}
-};
-
-static struct fsmc_eccplace fsmc_ecc4_sp_place = {
-	.eccplace = {
-		{.offset = 0, .length = 4},
-		{.offset = 6, .length = 9}
-	}
-};
-
 static int fsmc_ecc1_ooblayout_ecc(struct mtd_info *mtd, int section,
 				   struct mtd_oob_region *oobregion)
 {
@@ -105,6 +76,12 @@ static const struct mtd_ooblayout_ops fsmc_ecc1_ooblayout_ops = {
 	.free = fsmc_ecc1_ooblayout_free,
 };
 
+/*
+ * ECC placement definitions in oobfree type format.
+ * There are 13 bytes of ecc for every 512 byte block and it has to be read
+ * consecutively and immediately after the 512 byte data block for hardware to
+ * generate the error bit offsets in 512 byte data.
+ */
 static int fsmc_ecc4_ooblayout_ecc(struct mtd_info *mtd, int section,
 				   struct mtd_oob_region *oobregion)
 {
@@ -155,7 +132,6 @@ static const struct mtd_ooblayout_ops fsmc_ecc4_ooblayout_ops = {
  * @partitions:		Partition info for a NAND Flash.
  * @nr_partitions:	Total number of partition of a NAND flash.
  *
- * @ecc_place:		ECC placing locations in oobfree type format.
  * @bank:		Bank number for probed device.
  * @clk:		Clock structure for FSMC.
  *
@@ -175,7 +151,6 @@ struct fsmc_nand_data {
 	struct mtd_partition	*partitions;
 	unsigned int		nr_partitions;
 
-	struct fsmc_eccplace	*ecc_place;
 	unsigned int		bank;
 	struct device		*dev;
 	enum access_mode	mode;
@@ -582,8 +557,6 @@ static void fsmc_write_buf_dma(struct mtd_info *mtd, const uint8_t *buf,
 static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 				 uint8_t *buf, int oob_required, int page)
 {
-	struct fsmc_nand_data *host = mtd_to_fsmc(mtd);
-	struct fsmc_eccplace *ecc_place = host->ecc_place;
 	int i, j, s, stat, eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
@@ -606,9 +579,15 @@ static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->read_buf(mtd, p, eccsize);
 
 		for (j = 0; j < eccbytes;) {
-			off = ecc_place->eccplace[group].offset;
-			len = ecc_place->eccplace[group].length;
-			group++;
+			struct mtd_oob_region oobregion;
+			int ret;
+
+			ret = mtd_ooblayout_ecc(mtd, group++, &oobregion);
+			if (ret)
+				return ret;
+
+			off = oobregion.offset;
+			len = oobregion.length;
 
 			/*
 			 * length is intentionally kept a higher multiple of 2
@@ -956,19 +935,10 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	if (AMBA_REV_BITS(host->pid) >= 8) {
 		switch (mtd->oobsize) {
 		case 16:
-			host->ecc_place = &fsmc_ecc4_sp_place;
-			break;
 		case 64:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 128:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 224:
-			host->ecc_place = &fsmc_ecc4_lp_place;
-			break;
 		case 256:
-			host->ecc_place = &fsmc_ecc4_lp_place;
 			break;
 		default:
 			dev_warn(&pdev->dev, "No oob scheme defined for oobsize %d\n",
diff --git a/include/linux/mtd/fsmc.h b/include/linux/mtd/fsmc.h
index c8be32e..ad3c348 100644
--- a/include/linux/mtd/fsmc.h
+++ b/include/linux/mtd/fsmc.h
@@ -103,24 +103,6 @@
 
 #define FSMC_BUSY_WAIT_TIMEOUT	(1 * HZ)
 
-/*
- * There are 13 bytes of ecc for every 512 byte block in FSMC version 8
- * and it has to be read consecutively and immediately after the 512
- * byte data block for hardware to generate the error bit offsets
- * Managing the ecc bytes in the following way is easier. This way is
- * similar to oobfree structure maintained already in u-boot nand driver
- */
-#define MAX_ECCPLACE_ENTRIES	32
-
-struct fsmc_nand_eccplace {
-	uint8_t offset;
-	uint8_t length;
-};
-
-struct fsmc_eccplace {
-	struct fsmc_nand_eccplace eccplace[MAX_ECCPLACE_ENTRIES];
-};
-
 struct fsmc_nand_timings {
 	uint8_t tclr;
 	uint8_t tar;
-- 
2.1.4





  

    
[PATCH v3 39/52] mtd: nand: jz4780: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:07:53 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/jz4780_nand.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/nand/jz4780_nand.c b/drivers/mtd/nand/jz4780_nand.c
index e1c016c..b86a579 100644
--- a/drivers/mtd/nand/jz4780_nand.c
+++ b/drivers/mtd/nand/jz4780_nand.c
@@ -56,8 +56,6 @@ struct jz4780_nand_chip {
 	struct nand_chip chip;
 	struct list_head chip_list;
 
-	struct nand_ecclayout ecclayout;
-
 	struct gpio_desc *busy_gpio;
 	struct gpio_desc *wp_gpio;
 	unsigned int reading: 1;
@@ -165,8 +163,7 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
 	struct nand_chip *chip = &nand->chip;
 	struct mtd_info *mtd = nand_to_mtd(chip);
 	struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(chip->controller);
-	struct nand_ecclayout *layout = &nand->ecclayout;
-	u32 start, i;
+	int eccbytes;
 
 	chip->ecc.bytes = fls((1 + 8) * chip->ecc.size)	*
 				(chip->ecc.strength / 8);
@@ -201,23 +198,17 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
 		return 0;
 
 	/* Generate ECC layout. ECC codes are right aligned in the OOB area. */
-	layout->eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
+	eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
 
-	if (layout->eccbytes > mtd->oobsize - 2) {
+	if (eccbytes > mtd->oobsize - 2) {
 		dev_err(dev,
 			"invalid ECC config: required %d ECC bytes, but only %d are available",
-			layout->eccbytes, mtd->oobsize - 2);
+			eccbytes, mtd->oobsize - 2);
 		return -EINVAL;
 	}
 
-	start = mtd->oobsize - layout->eccbytes;
-	for (i = 0; i < layout->eccbytes; i++)
-		layout->eccpos[i] = start + i;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = mtd->oobsize - layout->eccbytes - 2;
+	mtd->ooblayout = &nand_ooblayout_lp_ops;
 
-	chip->ecc.layout = layout;
 	return 0;
 }
 
-- 
2.1.4





  

    
Re: [PATCH v3 39/52] mtd: nand: jz4780: switch to mtd_ooblayout_ops

    

      From: Harvey Hunt <hidden>

      Date: 2016-02-29 10:46:02 
    

  

  
Hi Boris,

On 26/02/16 00:57, Boris Brezillon wrote:
quoted hunk
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
  drivers/mtd/nand/jz4780_nand.c | 19 +++++--------------
  1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/nand/jz4780_nand.c b/drivers/mtd/nand/jz4780_nand.c
index e1c016c..b86a579 100644
--- a/drivers/mtd/nand/jz4780_nand.c
+++ b/drivers/mtd/nand/jz4780_nand.c
@@ -56,8 +56,6 @@ struct jz4780_nand_chip {
  	struct nand_chip chip;
  	struct list_head chip_list;

-	struct nand_ecclayout ecclayout;
-
  	struct gpio_desc *busy_gpio;
  	struct gpio_desc *wp_gpio;
  	unsigned int reading: 1;
@@ -165,8 +163,7 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
  	struct nand_chip *chip = &nand->chip;
  	struct mtd_info *mtd = nand_to_mtd(chip);
  	struct jz4780_nand_controller *nfc = to_jz4780_nand_controller(chip->controller);
-	struct nand_ecclayout *layout = &nand->ecclayout;
-	u32 start, i;
+	int eccbytes;

  	chip->ecc.bytes = fls((1 + 8) * chip->ecc.size)	*
  				(chip->ecc.strength / 8);
@@ -201,23 +198,17 @@ static int jz4780_nand_init_ecc(struct jz4780_nand_chip *nand, struct device *de
  		return 0;

  	/* Generate ECC layout. ECC codes are right aligned in the OOB area. */
-	layout->eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
+	eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;

-	if (layout->eccbytes > mtd->oobsize - 2) {
+	if (eccbytes > mtd->oobsize - 2) {
  		dev_err(dev,
  			"invalid ECC config: required %d ECC bytes, but only %d are available",
-			layout->eccbytes, mtd->oobsize - 2);
+			eccbytes, mtd->oobsize - 2);
  		return -EINVAL;
  	}

-	start = mtd->oobsize - layout->eccbytes;
-	for (i = 0; i < layout->eccbytes; i++)
-		layout->eccpos[i] = start + i;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = mtd->oobsize - layout->eccbytes - 2;
+	mtd->ooblayout = &nand_ooblayout_lp_ops;

-	chip->ecc.layout = layout;
  	return 0;
  }

With your patch applied [0] that you gave me earlier in the patchset, I 
am able to boot to userland on my Ci20 (jz4780_{nand,bch}) with a NAND 
rootfs. So, dependant upon that patch (or equivalent) being added to 
this patchset:

Tested-by: Harvey Hunt <redacted>

Thanks,

Harvey

[0] http://code.bulix.org/36oytz-91960





  

    
[PATCH v3 40/52] mtd: nand: lpc32xx: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:08:04 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/lpc32xx_mlc.c | 50 ++++++++++++++++++++++++++++--------------
 drivers/mtd/nand/lpc32xx_slc.c | 41 +++++++++++++++++++++++++++-------
 2 files changed, 66 insertions(+), 25 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_mlc.c b/drivers/mtd/nand/lpc32xx_mlc.c
index d8c3e7a..f668282 100644
--- a/drivers/mtd/nand/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/lpc32xx_mlc.c
@@ -139,22 +139,37 @@ struct lpc32xx_nand_cfg_mlc {
 	unsigned num_parts;
 };
 
-static struct nand_ecclayout lpc32xx_nand_oob = {
-	.eccbytes = 40,
-	.eccpos = { 6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
-		   22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-		   38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-		   54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
-	.oobfree = {
-		{ .offset = 0,
-		  .length = 6, },
-		{ .offset = 16,
-		  .length = 6, },
-		{ .offset = 32,
-		  .length = 6, },
-		{ .offset = 48,
-		  .length = 6, },
-		},
+static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = ((section + 1) * 16) - nand_chip->ecc.bytes;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = 16 * section;
+	oobregion->length = 16 - nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
+	.ecc = lpc32xx_ooblayout_ecc,
+	.free = lpc32xx_ooblayout_free,
 };
 
 static struct nand_bbt_descr lpc32xx_nand_bbt = {
@@ -713,6 +728,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	nand_chip->ecc.write_oob = lpc32xx_write_oob;
 	nand_chip->ecc.read_oob = lpc32xx_read_oob;
 	nand_chip->ecc.strength = 4;
+	nand_chip->ecc.bytes = 10;
 	nand_chip->waitfunc = lpc32xx_waitfunc;
 
 	nand_chip->options = NAND_NO_SUBPAGE_WRITE;
@@ -751,7 +767,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 
 	nand_chip->ecc.mode = NAND_ECC_HW;
 	nand_chip->ecc.size = 512;
-	nand_chip->ecc.layout = &lpc32xx_nand_oob;
+	mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 	host->mlcsubpages = mtd->writesize / 512;
 
 	/* initially clear interrupt status */
diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 10cf8e62..219dd67 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -146,13 +146,38 @@
  * NAND ECC Layout for small page NAND devices
  * Note: For large and huge page devices, the default layouts are used
  */
-static struct nand_ecclayout lpc32xx_nand_oob_16 = {
-	.eccbytes = 6,
-	.eccpos = {10, 11, 12, 13, 14, 15},
-	.oobfree = {
-		{ .offset = 0, .length = 4 },
-		{ .offset = 6, .length = 4 },
-	},
+static int lpc32xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	if (section)
+		return -ERANGE;
+
+	oobregion->length = 6;
+	oobregion->offset = 10;
+
+	return 0;
+}
+
+static int lpc32xx_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	if (section > 1)
+		return -ERANGE;
+
+	if (!section) {
+		oobregion->offset = 0;
+		oobregion->length = 4;
+	} else {
+		oobregion->offset = 6;
+		oobregion->length = 4;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops lpc32xx_ooblayout_ops = {
+	.ecc = lpc32xx_ooblayout_ecc,
+	.free = lpc32xx_ooblayout_free,
 };
 
 static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -886,7 +911,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	 * custom BBT marker layout.
 	 */
 	if (mtd->writesize <= 512)
-		chip->ecc.layout = &lpc32xx_nand_oob_16;
+		mtd_set_ooblayout(mtd, &lpc32xx_ooblayout_ops);
 
 	/* These sizes remain the same regardless of page size */
 	chip->ecc.size = 256;
-- 
2.1.4





  

    
[PATCH v3 42/52] mtd: nand: omap2: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:08:23 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/omap2.c | 194 +++++++++++++++++++++++++++--------------------
 1 file changed, 113 insertions(+), 81 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 4ebf16b..50c5b42 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -169,8 +169,6 @@ struct omap_nand_info {
 	u_char				*buf;
 	int					buf_len;
 	struct gpmc_nand_regs		reg;
-	/* generated at runtime depending on ECC algorithm and layout selected */
-	struct nand_ecclayout		oobinfo;
 	/* fields specific for BCHx_HW ECC scheme */
 	struct device			*elm_dev;
 	struct device_node		*of_node;
@@ -1639,19 +1637,108 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
 	return true;
 }
 
+static int omap_ooblayout_ecc(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = chip->ecc.bytes * chip->ecc.steps;
+
+	return 0;
+}
+
+static int omap_ooblayout_free(struct mtd_info *mtd, int section,
+			       struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	off += chip->ecc.bytes * chip->ecc.steps;
+	if (off >= mtd->oobsize)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = mtd->oobsize - off;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops omap_ooblayout_ops = {
+	.ecc = omap_ooblayout_ecc,
+	.free = omap_ooblayout_free,
+};
+
+static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	/*
+	 * When SW correction is employed, one OMAP specific marker byte is
+	 * reserved after each ECC step.
+	 */
+	oobregion->offset = off + (section * (chip->ecc.bytes + 1));
+	oobregion->length = chip->ecc.bytes;
+
+	return 0;
+}
+
+static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section,
+				  struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	int off = chip->options & NAND_BUSWIDTH_16 ?
+		  BADBLOCK_MARKER_LENGTH : 1;
+
+	if (section)
+		return -ERANGE;
+
+	/*
+	 * When SW correction is employed, one OMAP specific marker byte is
+	 * reserved after each ECC step.
+	 */
+	off += ((chip->ecc.bytes + 1) * chip->ecc.steps);
+	if (off >= mtd->oobsize)
+		return -ERANGE;
+
+	oobregion->offset = off;
+	oobregion->length = mtd->oobsize - off;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = {
+	.ecc = omap_sw_ooblayout_ecc,
+	.free = omap_sw_ooblayout_free,
+};
+
 static int omap_nand_probe(struct platform_device *pdev)
 {
 	struct omap_nand_info		*info;
 	struct omap_nand_platform_data	*pdata;
 	struct mtd_info			*mtd;
 	struct nand_chip		*nand_chip;
-	struct nand_ecclayout		*ecclayout;
 	int				err;
-	int				i;
 	dma_cap_mask_t			mask;
 	unsigned			sig;
-	unsigned			oob_index;
 	struct resource			*res;
+	int				min_oobbytes;
+	int				oobbytes_per_step;
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (pdata == NULL) {
@@ -1810,7 +1897,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 	/*
 	 * Bail out earlier to let NAND_ECC_SOFT code create its own
-	 * ecclayout instead of using ours.
+	 * ooblayout instead of using ours.
 	 */
 	if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
 		nand_chip->ecc.mode = NAND_ECC_SOFT;
@@ -1818,8 +1905,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* populate MTD interface based on ECC scheme */
-	ecclayout		= &info->oobinfo;
-	nand_chip->ecc.layout	= ecclayout;
 	switch (info->ecc_opt) {
 	case OMAP_ECC_HAM1_CODE_HW:
 		pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
@@ -1830,19 +1915,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate        = omap_calculate_ecc;
 		nand_chip->ecc.hwctl            = omap_enable_hwecc;
 		nand_chip->ecc.correct          = omap_correct_data;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		if (nand_chip->options & NAND_BUSWIDTH_16)
-			oob_index		= BADBLOCK_MARKER_LENGTH;
-		else
-			oob_index		= 1;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* no reserved-marker in ecclayout for this ecc-scheme */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 		break;
 
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -1854,19 +1928,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
 		nand_chip->ecc.correct		= nand_bch_correct_data;
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
-			ecclayout->eccpos[i] = oob_index;
-			if (((i + 1) % nand_chip->ecc.bytes) == 0)
-				oob_index++;
-		}
-		/* include reserved-marker in ecclayout->oobfree calculation */
-		ecclayout->oobfree->offset	= 1 +
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
+		/* Reserve one byte for the OMAP marker */
+		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
 		/* software bch library is used for locating errors */
 		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
@@ -1888,16 +1952,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH4_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1915,19 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.hwctl		= omap_enable_hwecc_bch;
 		nand_chip->ecc.correct		= nand_bch_correct_data;
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
-			ecclayout->eccpos[i] = oob_index;
-			if (((i + 1) % nand_chip->ecc.bytes) == 0)
-				oob_index++;
-		}
-		/* include reserved-marker in ecclayout->oobfree calculation */
-		ecclayout->oobfree->offset	= 1 +
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
+		mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops);
+		/* Reserve one byte for the OMAP marker */
+		oobbytes_per_step		= nand_chip->ecc.bytes + 1;
 		/* software bch library is used for locating errors */
 		nand_chip->ecc.priv		= nand_bch_init(mtd);
 		if (!nand_chip->ecc.priv) {
@@ -1949,6 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH8_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1956,16 +2004,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		if (err < 0)
 			goto return_error;
 
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		break;
 
 	case OMAP_ECC_BCH16_CODE_HW:
@@ -1979,6 +2017,8 @@ static int omap_nand_probe(struct platform_device *pdev)
 		nand_chip->ecc.calculate	= omap_calculate_ecc_bch;
 		nand_chip->ecc.read_page	= omap_read_page_bch;
 		nand_chip->ecc.write_page	= omap_write_page_bch;
+		mtd_set_ooblayout(mtd, &omap_ooblayout_ops);
+		oobbytes_per_step		= nand_chip->ecc.bytes;
 
 		err = elm_config(info->elm_dev, BCH16_ECC,
 				 mtd->writesize / nand_chip->ecc.size,
@@ -1986,16 +2026,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 		if (err < 0)
 			goto return_error;
 
-		/* define ECC layout */
-		ecclayout->eccbytes		= nand_chip->ecc.bytes *
-							(mtd->writesize /
-							nand_chip->ecc.size);
-		oob_index			= BADBLOCK_MARKER_LENGTH;
-		for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
-			ecclayout->eccpos[i]	= oob_index;
-		/* reserved marker already included in ecclayout->eccbytes */
-		ecclayout->oobfree->offset	=
-				ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
 		break;
 	default:
 		dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n");
@@ -2003,13 +2033,15 @@ static int omap_nand_probe(struct platform_device *pdev)
 		goto return_error;
 	}
 
-	/* all OOB bytes from oobfree->offset till end off OOB are free */
-	ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
 	/* check if NAND device's OOB is enough to store ECC signatures */
-	if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
+	min_oobbytes = (oobbytes_per_step *
+			(mtd->writesize / nand_chip->ecc.size)) +
+		       (nand_chip->options & NAND_BUSWIDTH_16 ?
+			BADBLOCK_MARKER_LENGTH : 1);
+	if (mtd->oobsize < min_oobbytes) {
 		dev_err(&info->pdev->dev,
 			"not enough OOB bytes required = %d, available=%d\n",
-			ecclayout->eccbytes, mtd->oobsize);
+			min_oobbytes, mtd->oobsize);
 		err = -EINVAL;
 		goto return_error;
 	}
-- 
2.1.4





  

    
[PATCH v3 41/52] mtd: nand: mxc: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:08:26 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/mxc_nand.c | 212 ++++++++++++++++++++++----------------------
 1 file changed, 105 insertions(+), 107 deletions(-)

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 854c832..628f834 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -149,7 +149,7 @@ struct mxc_nand_devtype_data {
 	int (*check_int)(struct mxc_nand_host *);
 	void (*irq_control)(struct mxc_nand_host *, int);
 	u32 (*get_ecc_status)(struct mxc_nand_host *);
-	struct nand_ecclayout *ecclayout_512, *ecclayout_2k, *ecclayout_4k;
+	const struct mtd_ooblayout_ops *ooblayout;
 	void (*select_chip)(struct mtd_info *mtd, int chip);
 	int (*correct_data)(struct mtd_info *mtd, u_char *dat,
 			u_char *read_ecc, u_char *calc_ecc);
@@ -200,73 +200,6 @@ struct mxc_nand_host {
 	struct mxc_nand_platform_data pdata;
 };
 
-/* OOB placement block for use with hardware ecc generation */
-static struct nand_ecclayout nandv1_hw_eccoob_smallpage = {
-	.eccbytes = 5,
-	.eccpos = {6, 7, 8, 9, 10},
-	.oobfree = {{0, 5}, {12, 4}, }
-};
-
-static struct nand_ecclayout nandv1_hw_eccoob_largepage = {
-	.eccbytes = 20,
-	.eccpos = {6, 7, 8, 9, 10, 22, 23, 24, 25, 26,
-		   38, 39, 40, 41, 42, 54, 55, 56, 57, 58},
-	.oobfree = {{2, 4}, {11, 10}, {27, 10}, {43, 10}, {59, 5}, }
-};
-
-/* OOB description for 512 byte pages with 16 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_smallpage = {
-	.eccbytes = 1 * 9,
-	.eccpos = {
-		 7,  8,  9, 10, 11, 12, 13, 14, 15
-	},
-	.oobfree = {
-		{.offset = 0, .length = 5}
-	}
-};
-
-/* OOB description for 2048 byte pages with 64 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_largepage = {
-	.eccbytes = 4 * 9,
-	.eccpos = {
-		 7,  8,  9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63
-	},
-	.oobfree = {
-		{.offset = 2, .length = 4},
-		{.offset = 16, .length = 7},
-		{.offset = 32, .length = 7},
-		{.offset = 48, .length = 7}
-	}
-};
-
-/* OOB description for 4096 byte pages with 128 byte OOB */
-static struct nand_ecclayout nandv2_hw_eccoob_4k = {
-	.eccbytes = 8 * 9,
-	.eccpos = {
-		7,  8,  9, 10, 11, 12, 13, 14, 15,
-		23, 24, 25, 26, 27, 28, 29, 30, 31,
-		39, 40, 41, 42, 43, 44, 45, 46, 47,
-		55, 56, 57, 58, 59, 60, 61, 62, 63,
-		71, 72, 73, 74, 75, 76, 77, 78, 79,
-		87, 88, 89, 90, 91, 92, 93, 94, 95,
-		103, 104, 105, 106, 107, 108, 109, 110, 111,
-		119, 120, 121, 122, 123, 124, 125, 126, 127,
-	},
-	.oobfree = {
-		{.offset = 2, .length = 4},
-		{.offset = 16, .length = 7},
-		{.offset = 32, .length = 7},
-		{.offset = 48, .length = 7},
-		{.offset = 64, .length = 7},
-		{.offset = 80, .length = 7},
-		{.offset = 96, .length = 7},
-		{.offset = 112, .length = 7},
-	}
-};
-
 static const char * const part_probes[] = {
 	"cmdlinepart", "RedBoot", "ofpart", NULL };
 
@@ -942,6 +875,99 @@ static void mxc_do_addr_cycle(struct mtd_info *mtd, int column, int page_addr)
 	}
 }
 
+static int mxc_v1_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * 16) + 6;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int mxc_v1_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+
+	if (section > nand_chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		if (mtd->writesize <= 512) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 2;
+			oobregion->length = 4;
+		}
+	} else {
+		oobregion->offset = ((section - 1) * 16) +
+				    nand_chip->ecc.bytes + 6;
+		if (section < nand_chip->ecc.steps)
+			oobregion->length = (section * 16) + 6 -
+					    oobregion->offset;
+		else
+			oobregion->length = mtd->oobsize - oobregion->offset;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mxc_v1_ooblayout_ops = {
+	.ecc = mxc_v1_ooblayout_ecc,
+	.free = mxc_v1_ooblayout_free,
+};
+
+static int mxc_v2_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+	int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
+
+	if (section >= nand_chip->ecc.steps)
+		return -ERANGE;
+
+	oobregion->offset = (section * stepsize) + 7;
+	oobregion->length = nand_chip->ecc.bytes;
+
+	return 0;
+}
+
+static int mxc_v2_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *nand_chip = mtd_to_nand(mtd);
+	int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
+
+	if (section > nand_chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		if (mtd->writesize <= 512) {
+			oobregion->offset = 0;
+			oobregion->length = 5;
+		} else {
+			oobregion->offset = 2;
+			oobregion->length = 4;
+		}
+	} else {
+		oobregion->offset = section * stepsize;
+		oobregion->length = 7;
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops mxc_v2_ooblayout_ops = {
+	.ecc = mxc_v2_ooblayout_ecc,
+	.free = mxc_v2_ooblayout_free,
+};
+
 /*
  * v2 and v3 type controllers can do 4bit or 8bit ecc depending
  * on how much oob the nand chip has. For 8bit ecc we need at least
@@ -959,23 +985,6 @@ static int get_eccsize(struct mtd_info *mtd)
 		return 8;
 }
 
-static void ecc_8bit_layout_4k(struct nand_ecclayout *layout)
-{
-	int i, j;
-
-	layout->eccbytes = 8*18;
-	for (i = 0; i < 8; i++)
-		for (j = 0; j < 18; j++)
-			layout->eccpos[i*18 + j] = i*26 + j + 7;
-
-	layout->oobfree[0].offset = 2;
-	layout->oobfree[0].length = 4;
-	for (i = 1; i < 8; i++) {
-		layout->oobfree[i].offset = i*26;
-		layout->oobfree[i].length = 7;
-	}
-}
-
 static void preset_v1(struct mtd_info *mtd)
 {
 	struct nand_chip *nand_chip = mtd_to_nand(mtd);
@@ -1269,9 +1278,7 @@ static const struct mxc_nand_devtype_data imx21_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v1,
-	.ecclayout_512 = &nandv1_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv1_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv1_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v1_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v1,
 	.irqpending_quirk = 1,
@@ -1294,9 +1301,7 @@ static const struct mxc_nand_devtype_data imx27_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v1,
-	.ecclayout_512 = &nandv1_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv1_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv1_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v1_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v1,
 	.irqpending_quirk = 0,
@@ -1320,9 +1325,7 @@ static const struct mxc_nand_devtype_data imx25_nand_devtype_data = {
 	.check_int = check_int_v1_v2,
 	.irq_control = irq_control_v1_v2,
 	.get_ecc_status = get_ecc_status_v2,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_4k,
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v2,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1346,9 +1349,7 @@ static const struct mxc_nand_devtype_data imx51_nand_devtype_data = {
 	.check_int = check_int_v3,
 	.irq_control = irq_control_v3,
 	.get_ecc_status = get_ecc_status_v3,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1373,9 +1374,7 @@ static const struct mxc_nand_devtype_data imx53_nand_devtype_data = {
 	.check_int = check_int_v3,
 	.irq_control = irq_control_v3,
 	.get_ecc_status = get_ecc_status_v3,
-	.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
-	.ecclayout_2k = &nandv2_hw_eccoob_largepage,
-	.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
+	.ooblayout = &mxc_v2_ooblayout_ops,
 	.select_chip = mxc_nand_select_chip_v1_v3,
 	.correct_data = mxc_nand_correct_data_v2_v3,
 	.irqpending_quirk = 0,
@@ -1576,7 +1575,7 @@ static int mxcnd_probe(struct platform_device *pdev)
 
 	this->select_chip = host->devtype_data->select_chip;
 	this->ecc.size = 512;
-	this->ecc.layout = host->devtype_data->ecclayout_512;
+	mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
 
 	if (host->pdata.hw_ecc) {
 		this->ecc.calculate = mxc_nand_calculate_ecc;
@@ -1649,12 +1648,11 @@ static int mxcnd_probe(struct platform_device *pdev)
 	/* Call preset again, with correct writesize this time */
 	host->devtype_data->preset(mtd);
 
-	if (mtd->writesize == 2048)
-		this->ecc.layout = host->devtype_data->ecclayout_2k;
-	else if (mtd->writesize == 4096) {
-		this->ecc.layout = host->devtype_data->ecclayout_4k;
-		if (get_eccsize(mtd) == 8)
-			ecc_8bit_layout_4k(this->ecc.layout);
+	if (!this->ecc.bytes) {
+		if (host->eccsize == 8)
+			this->ecc.bytes = 18;
+		else if (host->eccsize == 4)
+			this->ecc.bytes = 9;
 	}
 
 	/*
-- 
2.1.4





  

    
[PATCH v3 43/52] mtd: nand: pxa3xx: switch to mtd_ooblayout_ops

    

      From: Boris Brezillon <hidden>

      Date: 2016-02-26 01:08:35 
    

  

  
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <redacted>
---
 drivers/mtd/nand/pxa3xx_nand.c | 104 +++++++++++++++++++++++++----------------
 1 file changed, 64 insertions(+), 40 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 56e8954..ebd1902 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -325,6 +325,62 @@ static struct pxa3xx_nand_flash builtin_flash_types[] = {
 	{ 0xba20, 16, 16, &timing[3] },
 };
 
+static int pxa3xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
+	struct pxa3xx_nand_info *info = host->info_data;
+	int nchunks = mtd->writesize / info->chunk_size;
+
+	if (section >= nchunks)
+		return -ERANGE;
+
+	oobregion->offset = ((info->ecc_size + info->spare_size) * section) +
+			    info->spare_size;
+	oobregion->length = info->ecc_size;
+
+	return 0;
+}
+
+static int pxa3xx_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oobregion)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
+	struct pxa3xx_nand_info *info = host->info_data;
+	int nchunks = mtd->writesize / info->chunk_size;
+
+	if (section >= nchunks)
+		return -ERANGE;
+
+	if (!info->spare_size)
+		return 0;
+
+	oobregion->offset = section * (info->ecc_size + info->spare_size);
+	oobregion->length = info->spare_size;
+	if (!section) {
+		/*
+		 * Bootrom looks in bytes 0 & 5 for bad blocks for the
+		 * 4KB page / 4bit BCH combination.
+		 */
+		if (mtd->writesize == 4096 && info->chunk_size == 2048) {
+			oobregion->offset += 6;
+			oobregion->length -= 6;
+		} else {
+			oobregion->offset += 2;
+			oobregion->length -= 2;
+		}
+	}
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops pxa3xx_ooblayout_ops = {
+	.ecc = pxa3xx_ooblayout_ecc,
+	.free = pxa3xx_ooblayout_free,
+};
+
 static u8 bbt_pattern[] = {'M', 'V', 'B', 'b', 't', '0' };
 static u8 bbt_mirror_pattern[] = {'1', 't', 'b', 'B', 'V', 'M' };
 
@@ -348,41 +404,6 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 	.pattern = bbt_mirror_pattern
 };
 
-static struct nand_ecclayout ecc_layout_2KB_bch4bit = {
-	.eccbytes = 32,
-	.eccpos = {
-		32, 33, 34, 35, 36, 37, 38, 39,
-		40, 41, 42, 43, 44, 45, 46, 47,
-		48, 49, 50, 51, 52, 53, 54, 55,
-		56, 57, 58, 59, 60, 61, 62, 63},
-	.oobfree = { {2, 30} }
-};
-
-static struct nand_ecclayout ecc_layout_4KB_bch4bit = {
-	.eccbytes = 64,
-	.eccpos = {
-		32,  33,  34,  35,  36,  37,  38,  39,
-		40,  41,  42,  43,  44,  45,  46,  47,
-		48,  49,  50,  51,  52,  53,  54,  55,
-		56,  57,  58,  59,  60,  61,  62,  63,
-		96,  97,  98,  99,  100, 101, 102, 103,
-		104, 105, 106, 107, 108, 109, 110, 111,
-		112, 113, 114, 115, 116, 117, 118, 119,
-		120, 121, 122, 123, 124, 125, 126, 127},
-	/* Bootrom looks in bytes 0 & 5 for bad blocks */
-	.oobfree = { {6, 26}, { 64, 32} }
-};
-
-static struct nand_ecclayout ecc_layout_4KB_bch8bit = {
-	.eccbytes = 128,
-	.eccpos = {
-		32,  33,  34,  35,  36,  37,  38,  39,
-		40,  41,  42,  43,  44,  45,  46,  47,
-		48,  49,  50,  51,  52,  53,  54,  55,
-		56,  57,  58,  59,  60,  61,  62,  63},
-	.oobfree = { }
-};
-
 #define NDTR0_tCH(c)	(min((c), 7) << 19)
 #define NDTR0_tCS(c)	(min((c), 7) << 16)
 #define NDTR0_tWH(c)	(min((c), 7) << 11)
@@ -1547,9 +1568,12 @@ static void pxa3xx_nand_free_buff(struct pxa3xx_nand_info *info)
 }
 
 static int pxa_ecc_init(struct pxa3xx_nand_info *info,
-			struct nand_ecc_ctrl *ecc,
+			struct mtd_info *mtd,
 			int strength, int ecc_stepsize, int page_size)
 {
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
 	if (strength == 1 && ecc_stepsize == 512 && page_size == 2048) {
 		info->nfullchunks = 1;
 		info->ntotalchunks = 1;
@@ -1583,7 +1607,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_2KB_bch4bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 
 	} else if (strength == 4 && ecc_stepsize == 512 && page_size == 4096) {
@@ -1595,7 +1619,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_4KB_bch4bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 
 	/*
@@ -1613,7 +1637,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 		info->ecc_size = 32;
 		ecc->mode = NAND_ECC_HW;
 		ecc->size = info->chunk_size;
-		ecc->layout = &ecc_layout_4KB_bch8bit;
+		mtd_set_ooblayout(mtd, &pxa3xx_ooblayout_ops);
 		ecc->strength = 16;
 	} else {
 		dev_err(&info->pdev->dev,
@@ -1704,7 +1728,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
 		ecc_step = 512;
 	}
 
-	ret = pxa_ecc_init(info, &chip->ecc, ecc_strength,
+	ret = pxa_ecc_init(info, mtd, ecc_strength,
 			   ecc_step, mtd->writesize);
 	if (ret)
 		return ret;
-- 
2.1.4






  
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