Thread (68 messages) 68 messages, 4 authors, 2011-02-24

Re: [PATCH 05/20] pata_efar: always program master_data before slave_data

From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Date: 2011-02-23 10:29:36
Also in: lkml

Alan Cox wrote:
quoted
on the other side of equation we have 5 drivers less, 1400 LOCs less,
no risk of losing bugfixes and features (which is true already w/
pata_rdc lacking locking fixes + Power Management and pata_oldpiix
lacking parallel scanning feature).
The parallel scanning feature is somewhat irrelevant on an original PIIX,
if the hardware even supports it which is somewhat of an unknown. If you
have a minor boot time performance concern you'd buy a real computer
instead.

And the other stuff you actually create a problem rather than solving one
- the difficulting testing the rare chips makes it harder to fix ata_piix
bugs and do full testing.
We don't have to insist on merging all PIIX-alikes (like oldPIIX and Radisys)
support to ata_piix, i.e. for RDC it looks much cleaner:

per patch from the original patch series:
 4 files changed, 13 insertions(+), 387 deletions(-)

pata_rdc driver is nearly identical to ata_piix PATA support (modulo bugs in
pata_rdc and SATA stuff in ata_piix)


From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Subject: [PATCH] ata_piix: add RDC support

Add RDC PATA support to ata_piix and remove no longer
needed pata_rdc driver.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
 drivers/ata/Kconfig    |    1 
 drivers/ata/Makefile   |    1 
 drivers/ata/ata_piix.c |   14 +
 drivers/ata/pata_rdc.c |  384 -------------------------------------------------
 4 files changed, 13 insertions(+), 387 deletions(-)

Index: b/drivers/ata/Kconfig
===================================================================
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -567,6 +567,7 @@ config PATA_RADISYS
 config PATA_RDC
 	tristate "RDC PATA support"
 	depends on PCI
+	select ATA_PIIX
 	help
 	  This option enables basic support for the later RDC PATA controllers
 	  controllers via the new ATA layer. For the RDC 1010, you need to
Index: b/drivers/ata/Makefile
===================================================================
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -58,7 +58,6 @@ obj-$(CONFIG_PATA_OPTIDMA)	+= pata_optid
 obj-$(CONFIG_PATA_PDC2027X)	+= pata_pdc2027x.o
 obj-$(CONFIG_PATA_PDC_OLD)	+= pata_pdc202xx_old.o
 obj-$(CONFIG_PATA_RADISYS)	+= pata_radisys.o
-obj-$(CONFIG_PATA_RDC)		+= pata_rdc.o
 obj-$(CONFIG_PATA_SC1200)	+= pata_sc1200.o
 obj-$(CONFIG_PATA_SCC)		+= pata_scc.o
 obj-$(CONFIG_PATA_SCH)		+= pata_sch.o
Index: b/drivers/ata/ata_piix.c
===================================================================
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1,6 +1,9 @@
 /*
  *    ata_piix.c - Intel PATA/SATA controllers
  *
+ *    This is actually a driver for hardware meeting
+ *    INCITS 370-2004 (1510D): ATA Host Adapter Standards
+ *
  *    Maintained by:  Jeff Garzik <jgarzik@pobox.com>
  *    		    Please ALWAYS copy linux-ide@vger.kernel.org
  *		    on emails.
@@ -255,6 +258,10 @@ static const struct pci_device_id piix_p
 	/* IT8213 */
 	{ 0x1283, 0x8213, PCI_ANY_ID, PCI_ANY_ID, 0, 0, it8213_pata },
 
+	/* RDC is ICH like */
+	{ 0x17F3, 0x1011, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
+	{ 0x17F3, 0x1012, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich_pata_100 },
+
 	/* SATA ports */
 	
 	/* 82801EB (ICH5) */
@@ -671,6 +678,7 @@ MODULE_DEVICE_TABLE(pci, piix_pci_tbl);
 MODULE_VERSION(DRV_VERSION);
 MODULE_ALIAS("pata_efar");
 MODULE_ALIAS("pata_it8213");
+MODULE_ALIAS("pata_rdc");
 
 struct ich_laptop {
 	u16 device;
@@ -1676,7 +1684,8 @@ static int __devinit piix_init_one(struc
 	 * because some ACPI implementations mess up cable related
 	 * bits on _STM.  Reported on kernel bz#11879.
 	 */
-	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
+	if (pdev->vendor == PCI_VENDOR_ID_INTEL ||
+	    pdev->vendor == PCI_VENDOR_ID_RDC)
 		pci_read_config_dword(pdev, PIIX_IOCFG, &hpriv->saved_iocfg);
 
 	/* ICH6R may be driven by either ata_piix or ahci driver
@@ -1741,7 +1750,8 @@ static void piix_remove_one(struct pci_d
 	struct ata_host *host = dev_get_drvdata(&pdev->dev);
 	struct piix_host_priv *hpriv = host->private_data;
 
-	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
+	if (pdev->vendor == PCI_VENDOR_ID_INTEL ||
+	    pdev->vendor == PCI_VENDOR_ID_RDC)
 		pci_write_config_dword(pdev, PIIX_IOCFG, hpriv->saved_iocfg);
 
 	ata_pci_remove_one(pdev);
Index: b/drivers/ata/pata_rdc.c
===================================================================
--- a/drivers/ata/pata_rdc.c
+++ /dev/null
@@ -1,384 +0,0 @@
-/*
- *  pata_rdc		-	Driver for later RDC PATA controllers
- *
- *  This is actually a driver for hardware meeting
- *  INCITS 370-2004 (1510D): ATA Host Adapter Standards
- *
- *  Based on ata_piix.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2, or (at your option)
- *  any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; see the file COPYING.  If not, write to
- *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/init.h>
-#include <linux/blkdev.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/gfp.h>
-#include <scsi/scsi_host.h>
-#include <linux/libata.h>
-#include <linux/dmi.h>
-
-#define DRV_NAME	"pata_rdc"
-#define DRV_VERSION	"0.01"
-
-struct rdc_host_priv {
-	u32 saved_iocfg;
-};
-
-/**
- *	rdc_pata_cable_detect - Probe host controller cable detect info
- *	@ap: Port for which cable detect info is desired
- *
- *	Read 80c cable indicator from ATA PCI device's PCI config
- *	register.  This register is normally set by firmware (BIOS).
- *
- *	LOCKING:
- *	None (inherited from caller).
- */
-
-static int rdc_pata_cable_detect(struct ata_port *ap)
-{
-	struct rdc_host_priv *hpriv = ap->host->private_data;
-	u8 mask;
-
-	/* check BIOS cable detect results */
-	mask = 0x30 << (2 * ap->port_no);
-	if ((hpriv->saved_iocfg & mask) == 0)
-		return ATA_CBL_PATA40;
-	return ATA_CBL_PATA80;
-}
-
-/**
- *	rdc_pata_prereset - prereset for PATA host controller
- *	@link: Target link
- *	@deadline: deadline jiffies for the operation
- *
- *	LOCKING:
- *	None (inherited from caller).
- */
-static int rdc_pata_prereset(struct ata_link *link, unsigned long deadline)
-{
-	struct ata_port *ap = link->ap;
-	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-
-	static const struct pci_bits rdc_enable_bits[] = {
-		{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
-		{ 0x43U, 1U, 0x80UL, 0x80UL },	/* port 1 */
-	};
-
-	if (!pci_test_config_bits(pdev, &rdc_enable_bits[ap->port_no]))
-		return -ENOENT;
-	return ata_sff_prereset(link, deadline);
-}
-
-static DEFINE_SPINLOCK(rdc_lock);
-
-static void rdc_set_timings(struct ata_port *ap, struct ata_device *adev,
-			    u8 pio, bool use_mwdma)
-{
-	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
-	unsigned long flags;
-	unsigned int is_slave	= (adev->devno != 0);
-	unsigned int master_port= ap->port_no ? 0x42 : 0x40;
-	unsigned int slave_port	= 0x44;
-	u16 master_data;
-	u8 slave_data;
-	u8 udma_enable;
-	int control = 0;
-
-	static const	 /* ISP  RTC */
-	u8 timings[][2]	= { { 0, 0 },
-			    { 0, 0 },
-			    { 1, 0 },
-			    { 2, 1 },
-			    { 2, 3 }, };
-
-	if (pio >= 2 || use_mwdma)
-		control |= 1;	/* TIME1 enable */
-	if (ata_pio_need_iordy(adev) || use_mwdma)
-		control |= 2;	/* IE enable */
-	if (adev->class == ATA_DEV_ATA)
-		control |= 4;	/* PPE enable */
-	/* If the drive MWDMA is faster than it can do PIO then
-	   we must force PIO into PIO0 */
-	if (use_mwdma && adev->pio_mode < (XFER_PIO_0 + pio))
-		/* Enable DMA timing only */
-		control |= 8;	/* PIO cycles in PIO0 */
-
-	spin_lock_irqsave(&rdc_lock, flags);
-
-	/* PIO configuration clears DTE unconditionally.  It will be
-	 * programmed in set_dmamode which is guaranteed to be called
-	 * after set_piomode if any DMA mode is available.
-	 */
-	pci_read_config_word(dev, master_port, &master_data);
-	if (is_slave) {
-		/* clear TIME1|IE1|PPE1|DTE1 */
-		master_data &= 0xff0f;
-		/* Enable SITRE (separate slave timing register) */
-		master_data |= 0x4000;
-		/* enable PPE1, IE1 and TIME1 as needed */
-		master_data |= (control << 4);
-		pci_read_config_byte(dev, slave_port, &slave_data);
-		slave_data &= (ap->port_no ? 0x0f : 0xf0);
-		/* Load the timing nibble for this slave */
-		slave_data |= ((timings[pio][0] << 2) | timings[pio][1])
-						<< (ap->port_no ? 4 : 0);
-	} else {
-		/* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */
-		master_data &= 0xccf0;
-		/* Enable PPE, IE and TIME as appropriate */
-		master_data |= control;
-		/* load ISP and RCT */
-		master_data |=
-			(timings[pio][0] << 12) |
-			(timings[pio][1] << 8);
-	}
-	pci_write_config_word(dev, master_port, master_data);
-	if (is_slave)
-		pci_write_config_byte(dev, slave_port, slave_data);
-
-	/* Ensure the UDMA bit is off - it will be turned back on if
-	   UDMA is selected */
-
-	pci_read_config_byte(dev, 0x48, &udma_enable);
-	udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
-	pci_write_config_byte(dev, 0x48, udma_enable);
-
-	spin_unlock_irqrestore(&rdc_lock, flags);
-}
-
-/**
- *	rdc_set_piomode - Initialize host controller PATA PIO timings
- *	@ap: Port whose timings we are configuring
- *	@adev: Drive in question
- *
- *	Set PIO mode for device, in host controller PCI config space.
- *
- *	LOCKING:
- *	None (inherited from caller).
- */
-
-static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev)
-{
-	rdc_set_timings(ap, adev, adev->pio_mode - XFER_PIO_0, 0);
-}
-
-/**
- *	rdc_set_dmamode - Initialize host controller PATA PIO timings
- *	@ap: Port whose timings we are configuring
- *	@adev: Drive in question
- *
- *	Set UDMA mode for device, in host controller PCI config space.
- *
- *	LOCKING:
- *	None (inherited from caller).
- */
-
-static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev)
-{
-	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
-	unsigned long flags;
-	u8 speed		= adev->dma_mode;
-	int devid		= adev->devno + 2 * ap->port_no;
-	u8 udma_enable		= 0;
-
-	if (speed >= XFER_UDMA_0) {
-		unsigned int udma = speed - XFER_UDMA_0;
-		u16 udma_timing;
-		u16 ideconf;
-		int u_clock, u_speed;
-
-		spin_lock_irqsave(&rdc_lock, flags);
-
-		pci_read_config_byte(dev, 0x48, &udma_enable);
-
-		/*
-		 * UDMA is handled by a combination of clock switching and
-		 * selection of dividers
-		 *
-		 * Handy rule: Odd modes are UDMATIMx 01, even are 02
-		 *	       except UDMA0 which is 00
-		 */
-		u_speed = min(2 - (udma & 1), udma);
-		if (udma == 5)
-			u_clock = 0x1000;	/* 100Mhz */
-		else if (udma > 2)
-			u_clock = 1;		/* 66Mhz */
-		else
-			u_clock = 0;		/* 33Mhz */
-
-		udma_enable |= (1 << devid);
-
-		/* Load the CT/RP selection */
-		pci_read_config_word(dev, 0x4A, &udma_timing);
-		udma_timing &= ~(3 << (4 * devid));
-		udma_timing |= u_speed << (4 * devid);
-		pci_write_config_word(dev, 0x4A, udma_timing);
-
-		/* Select a 33/66/100Mhz clock */
-		pci_read_config_word(dev, 0x54, &ideconf);
-		ideconf &= ~(0x1001 << devid);
-		ideconf |= u_clock << devid;
-		pci_write_config_word(dev, 0x54, ideconf);
-
-		pci_write_config_byte(dev, 0x48, udma_enable);
-
-		spin_unlock_irqrestore(&rdc_lock, flags);
-	} else {
-		/* MWDMA is driven by the PIO timings. */
-		unsigned int mwdma = speed - XFER_MW_DMA_0;
-		const unsigned int needed_pio[3] = {
-			XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
-		};
-		int pio = needed_pio[mwdma] - XFER_PIO_0;
-
-		rdc_set_timings(ap, adev, pio, 1);
-	}
-}
-
-static struct ata_port_operations rdc_pata_ops = {
-	.inherits		= &ata_bmdma32_port_ops,
-	.cable_detect		= rdc_pata_cable_detect,
-	.set_piomode		= rdc_set_piomode,
-	.set_dmamode		= rdc_set_dmamode,
-	.prereset		= rdc_pata_prereset,
-};
-
-static struct ata_port_info rdc_port_info = {
-
-	.flags		= ATA_FLAG_SLAVE_POSS,
-	.pio_mask	= ATA_PIO4,
-	.mwdma_mask	= ATA_MWDMA12_ONLY,
-	.udma_mask	= ATA_UDMA5,
-	.port_ops	= &rdc_pata_ops,
-};
-
-static struct scsi_host_template rdc_sht = {
-	ATA_BMDMA_SHT(DRV_NAME),
-};
-
-/**
- *	rdc_init_one - Register PIIX ATA PCI device with kernel services
- *	@pdev: PCI device to register
- *	@ent: Entry in rdc_pci_tbl matching with @pdev
- *
- *	Called from kernel PCI layer.  We probe for combined mode (sigh),
- *	and then hand over control to libata, for it to do the rest.
- *
- *	LOCKING:
- *	Inherited from PCI layer (may sleep).
- *
- *	RETURNS:
- *	Zero on success, or -ERRNO value.
- */
-
-static int __devinit rdc_init_one(struct pci_dev *pdev,
-				   const struct pci_device_id *ent)
-{
-	static int printed_version;
-	struct device *dev = &pdev->dev;
-	struct ata_port_info port_info[2];
-	const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
-	unsigned long port_flags;
-	struct ata_host *host;
-	struct rdc_host_priv *hpriv;
-	int rc;
-
-	if (!printed_version++)
-		dev_printk(KERN_DEBUG, &pdev->dev,
-			   "version " DRV_VERSION "\n");
-
-	port_info[0] = rdc_port_info;
-	port_info[1] = rdc_port_info;
-
-	port_flags = port_info[0].flags;
-
-	/* enable device and prepare host */
-	rc = pcim_enable_device(pdev);
-	if (rc)
-		return rc;
-
-	hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
-	if (!hpriv)
-		return -ENOMEM;
-
-	/* Save IOCFG, this will be used for cable detection, quirk
-	 * detection and restoration on detach.
-	 */
-	pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg);
-
-	rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
-	if (rc)
-		return rc;
-	host->private_data = hpriv;
-
-	pci_intx(pdev, 1);
-
-	host->flags |= ATA_HOST_PARALLEL_SCAN;
-
-	pci_set_master(pdev);
-	return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &rdc_sht);
-}
-
-static void rdc_remove_one(struct pci_dev *pdev)
-{
-	struct ata_host *host = dev_get_drvdata(&pdev->dev);
-	struct rdc_host_priv *hpriv = host->private_data;
-
-	pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg);
-
-	ata_pci_remove_one(pdev);
-}
-
-static const struct pci_device_id rdc_pci_tbl[] = {
-	{ PCI_DEVICE(0x17F3, 0x1011), },
-	{ PCI_DEVICE(0x17F3, 0x1012), },
-	{ }	/* terminate list */
-};
-
-static struct pci_driver rdc_pci_driver = {
-	.name			= DRV_NAME,
-	.id_table		= rdc_pci_tbl,
-	.probe			= rdc_init_one,
-	.remove			= rdc_remove_one,
-#ifdef CONFIG_PM
-	.suspend		= ata_pci_device_suspend,
-	.resume			= ata_pci_device_resume,
-#endif
-};
-
-
-static int __init rdc_init(void)
-{
-	return pci_register_driver(&rdc_pci_driver);
-}
-
-static void __exit rdc_exit(void)
-{
-	pci_unregister_driver(&rdc_pci_driver);
-}
-
-module_init(rdc_init);
-module_exit(rdc_exit);
-
-MODULE_AUTHOR("Alan Cox (based on ata_piix)");
-MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers");
-MODULE_LICENSE("GPL");
-MODULE_DEVICE_TABLE(pci, rdc_pci_tbl);
-MODULE_VERSION(DRV_VERSION);
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