[PATCH v8 08/19] mtd: spi-nor: sfdp: get command opcode extension type from BFPT
From: Pratyush Yadav <hidden>
Date: 2020-05-22 22:41:48
Also in:
linux-mediatek, linux-spi, lkml
Subsystem:
memory technology devices (mtd), spi nor subsystem, the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Pratyush Yadav, Michael Walle, Linus Torvalds
Some devices in DTR mode expect an extra command byte called the extension. The extension can either be same as the opcode, bitwise inverse of the opcode, or another additional byte forming a 16-byte opcode. Get the extension type from the BFPT. For now, only flashes with "repeat" and "inverse" extensions are supported. Signed-off-by: Pratyush Yadav <redacted> --- drivers/mtd/spi-nor/sfdp.c | 17 +++++++++++++++++ drivers/mtd/spi-nor/sfdp.h | 6 ++++++ 2 files changed, 23 insertions(+)
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index 96960f2f3d7a..ab086aa4746f 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c@@ -609,6 +609,23 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor, if (bfpt_header->length == BFPT_DWORD_MAX_JESD216B) return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt, params); + /* 8D-8D-8D command extension. */ + switch (bfpt.dwords[BFPT_DWORD(18)] & BFPT_DWORD18_CMD_EXT_MASK) { + case BFPT_DWORD18_CMD_EXT_REP: + nor->cmd_ext_type = SPI_NOR_EXT_REPEAT; + break; + + case BFPT_DWORD18_CMD_EXT_INV: + nor->cmd_ext_type = SPI_NOR_EXT_INVERT; + break; + + case BFPT_DWORD18_CMD_EXT_RES: + return -EINVAL; + + case BFPT_DWORD18_CMD_EXT_16B: + dev_err(nor->dev, "16-bit opcodes not supported\n"); + return -ENOTSUPP; + } return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt, params); }
diff --git a/drivers/mtd/spi-nor/sfdp.h b/drivers/mtd/spi-nor/sfdp.h
index f8198af43a63..e15e30796d62 100644
--- a/drivers/mtd/spi-nor/sfdp.h
+++ b/drivers/mtd/spi-nor/sfdp.h@@ -84,6 +84,12 @@ struct sfdp_bfpt { #define BFPT_DWORD15_QER_SR2_BIT1_NO_RD (0x4UL << 20) #define BFPT_DWORD15_QER_SR2_BIT1 (0x5UL << 20) /* Spansion */ +#define BFPT_DWORD18_CMD_EXT_MASK GENMASK(30, 29) +#define BFPT_DWORD18_CMD_EXT_REP (0x0UL << 29) /* Repeat */ +#define BFPT_DWORD18_CMD_EXT_INV (0x1UL << 29) /* Invert */ +#define BFPT_DWORD18_CMD_EXT_RES (0x2UL << 29) /* Reserved */ +#define BFPT_DWORD18_CMD_EXT_16B (0x3UL << 29) /* 16-bit opcode */ + struct sfdp_parameter_header { u8 id_lsb; u8 minor;
--
2.26.2
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