drivers/ide/cs5536.c - kernel/msm-4.9 - Gitiles

 /*
  * CS5536 PATA support
  * (C) 2007 Martin K. Petersen <mkp@mkp.net>
  * (C) 2009 Bartlomiej Zolnierkiewicz
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * 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; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  * Documentation:
  *	Available from AMD web site.
  *
  * The IDE timing registers for the CS5536 live in the Geode Machine
  * Specific Register file and not PCI config space.  Most BIOSes
  * virtualize the PCI registers so the chip looks like a standard IDE
  * controller.  Unfortunately not all implementations get this right.
  * In particular some have problems with unaligned accesses to the
  * virtualized PCI registers.  This driver always does full dword
  * writes to work around the issue.  Also, in case of a bad BIOS this
  * driver can be loaded with the "msr=1" parameter which forces using
  * the Machine Specific Registers to configure the device.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/ide.h>
 #include <asm/msr.h>

 #define DRV_NAME	"cs5536"

 enum {
 	MSR_IDE_CFG		= 0x51300010,
 	PCI_IDE_CFG		= 0x40,

 	CFG			= 0,
 	DTC			= 2,
 	CAST			= 3,
 	ETC			= 4,

 	IDE_CFG_CHANEN		= (1 << 1),
 	IDE_CFG_CABLE		= (1 << 17) | (1 << 16),

 	IDE_D0_SHIFT		= 24,
 	IDE_D1_SHIFT		= 16,
 	IDE_DRV_MASK		= 0xff,

 	IDE_CAST_D0_SHIFT	= 6,
 	IDE_CAST_D1_SHIFT	= 4,
 	IDE_CAST_DRV_MASK	= 0x3,

 	IDE_CAST_CMD_SHIFT	= 24,
 	IDE_CAST_CMD_MASK	= 0xff,

 	IDE_ETC_UDMA_MASK	= 0xc0,
 };

 static int use_msr;

 static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val)
 {
 	if (unlikely(use_msr)) {
 		u32 dummy;

 		rdmsr(MSR_IDE_CFG + reg, *val, dummy);
 		return 0;
 	}

 	return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
 }

 static int cs5536_write(struct pci_dev *pdev, int reg, int val)
 {
 	if (unlikely(use_msr)) {
 		wrmsr(MSR_IDE_CFG + reg, val, 0);
 		return 0;
 	}

 	return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
 }

 static void cs5536_program_dtc(ide_drive_t *drive, u8 tim)
 {
 	struct pci_dev *pdev = to_pci_dev(drive->hwif->dev);
 	int dshift = (drive->dn & 1) ? IDE_D1_SHIFT : IDE_D0_SHIFT;
 	u32 dtc;

 	cs5536_read(pdev, DTC, &dtc);
 	dtc &= ~(IDE_DRV_MASK << dshift);
 	dtc |= tim << dshift;
 	cs5536_write(pdev, DTC, dtc);
 }

 /**
  *	cs5536_cable_detect	-	detect cable type
  *	@hwif: Port to detect on
  *
  *	Perform cable detection for ATA66 capable cable.
  *
  *	Returns a cable type.
  */

 static u8 cs5536_cable_detect(ide_hwif_t *hwif)
 {
 	struct pci_dev *pdev = to_pci_dev(hwif->dev);
 	u32 cfg;

 	cs5536_read(pdev, CFG, &cfg);

 	if (cfg & IDE_CFG_CABLE)
 		return ATA_CBL_PATA80;
 	else
 		return ATA_CBL_PATA40;
 }

 /**
  *	cs5536_set_pio_mode		-	PIO timing setup
  *	@drive: ATA device
  *	@pio: PIO mode number
  */

 static void cs5536_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	static const u8 drv_timings[5] = {
 		0x98, 0x55, 0x32, 0x21, 0x20,
 	};

 	static const u8 addr_timings[5] = {
 		0x2, 0x1, 0x0, 0x0, 0x0,
 	};

 	static const u8 cmd_timings[5] = {
 		0x99, 0x92, 0x90, 0x22, 0x20,
 	};

 	struct pci_dev *pdev = to_pci_dev(drive->hwif->dev);
 	ide_drive_t *pair = ide_get_pair_dev(drive);
 	int cshift = (drive->dn & 1) ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
 	u32 cast;
 	u8 cmd_pio = pio;

 	if (pair)
 		cmd_pio = min(pio, ide_get_best_pio_mode(pair, 255, 4));

 	drive->drive_data &= (IDE_DRV_MASK << 8);
 	drive->drive_data |= drv_timings[pio];

 	cs5536_program_dtc(drive, drv_timings[pio]);

 	cs5536_read(pdev, CAST, &cast);

 	cast &= ~(IDE_CAST_DRV_MASK << cshift);
 	cast |= addr_timings[pio] << cshift;

 	cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
 	cast |= cmd_timings[cmd_pio] << IDE_CAST_CMD_SHIFT;

 	cs5536_write(pdev, CAST, cast);
 }

 /**
  *	cs5536_set_dma_mode		-	DMA timing setup
  *	@drive: ATA device
  *	@mode: DMA mode
  */

 static void cs5536_set_dma_mode(ide_drive_t *drive, const u8 mode)
 {
 	static const u8 udma_timings[6] = {
 		0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
 	};

 	static const u8 mwdma_timings[3] = {
 		0x67, 0x21, 0x20,
 	};

 	struct pci_dev *pdev = to_pci_dev(drive->hwif->dev);
 	int dshift = (drive->dn & 1) ? IDE_D1_SHIFT : IDE_D0_SHIFT;
 	u32 etc;

 	cs5536_read(pdev, ETC, &etc);

 	if (mode >= XFER_UDMA_0) {
 		etc &= ~(IDE_DRV_MASK << dshift);
 		etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
 	} else { /* MWDMA */
 		etc &= ~(IDE_ETC_UDMA_MASK << dshift);
 		drive->drive_data &= IDE_DRV_MASK;
 		drive->drive_data |= mwdma_timings[mode - XFER_MW_DMA_0] << 8;
 	}

 	cs5536_write(pdev, ETC, etc);
 }

 static void cs5536_dma_start(ide_drive_t *drive)
 {
 	if (drive->current_speed < XFER_UDMA_0 &&
 	    (drive->drive_data >> 8) != (drive->drive_data & IDE_DRV_MASK))
 		cs5536_program_dtc(drive, drive->drive_data >> 8);

 	ide_dma_start(drive);
 }

 static int cs5536_dma_end(ide_drive_t *drive)
 {
 	int ret = ide_dma_end(drive);

 	if (drive->current_speed < XFER_UDMA_0 &&
 	    (drive->drive_data >> 8) != (drive->drive_data & IDE_DRV_MASK))
 		cs5536_program_dtc(drive, drive->drive_data & IDE_DRV_MASK);

 	return ret;
 }

 static const struct ide_port_ops cs5536_port_ops = {
 	.set_pio_mode		= cs5536_set_pio_mode,
 	.set_dma_mode		= cs5536_set_dma_mode,
 	.cable_detect		= cs5536_cable_detect,
 };

 static const struct ide_dma_ops cs5536_dma_ops = {
 	.dma_host_set		= ide_dma_host_set,
 	.dma_setup		= ide_dma_setup,
 	.dma_start		= cs5536_dma_start,
 	.dma_end		= cs5536_dma_end,
 	.dma_test_irq		= ide_dma_test_irq,
 	.dma_lost_irq		= ide_dma_lost_irq,
 	.dma_timer_expiry	= ide_dma_sff_timer_expiry,
 };

 static const struct ide_port_info cs5536_info = {
 	.name		= DRV_NAME,
 	.port_ops	= &cs5536_port_ops,
 	.dma_ops	= &cs5536_dma_ops,
 	.host_flags	= IDE_HFLAG_SINGLE,
 	.pio_mask	= ATA_PIO4,
 	.mwdma_mask	= ATA_MWDMA2,
 	.udma_mask	= ATA_UDMA5,
 };

 /**
  *	cs5536_init_one
  *	@dev: PCI device
  *	@id: Entry in match table
  */

 static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	u32 cfg;

 	if (use_msr)
 		printk(KERN_INFO DRV_NAME ": Using MSR regs instead of PCI\n");

 	cs5536_read(dev, CFG, &cfg);

 	if ((cfg & IDE_CFG_CHANEN) == 0) {
 		printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
 		return -ENODEV;
 	}

 	return ide_pci_init_one(dev, &cs5536_info, NULL);
 }

 static const struct pci_device_id cs5536_pci_tbl[] = {
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), },
 	{ },
 };

 static struct pci_driver cs5536_pci_driver = {
 	.name		= DRV_NAME,
 	.id_table	= cs5536_pci_tbl,
 	.probe		= cs5536_init_one,
 	.remove		= ide_pci_remove,
 	.suspend	= ide_pci_suspend,
 	.resume		= ide_pci_resume,
 };

 static int __init cs5536_init(void)
 {
 	return pci_register_driver(&cs5536_pci_driver);
 }

 static void __exit cs5536_exit(void)
 {
 	pci_unregister_driver(&cs5536_pci_driver);
 }

 MODULE_AUTHOR("Martin K. Petersen, Bartlomiej Zolnierkiewicz");
 MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, cs5536_pci_tbl);

 module_param_named(msr, use_msr, int, 0644);
 MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");

 module_init(cs5536_init);
 module_exit(cs5536_exit);
	/*
	* CS5536 PATA support
	* (C) 2007 Martin K. Petersen <mkp@mkp.net>
	* (C) 2009 Bartlomiej Zolnierkiewicz
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* 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; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	* Documentation:
	* Available from AMD web site.
	*
	* The IDE timing registers for the CS5536 live in the Geode Machine
	* Specific Register file and not PCI config space. Most BIOSes
	* virtualize the PCI registers so the chip looks like a standard IDE
	* controller. Unfortunately not all implementations get this right.
	* In particular some have problems with unaligned accesses to the
	* virtualized PCI registers. This driver always does full dword
	* writes to work around the issue. Also, in case of a bad BIOS this
	* driver can be loaded with the "msr=1" parameter which forces using
	* the Machine Specific Registers to configure the device.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/init.h>
	#include <linux/ide.h>
	#include <asm/msr.h>

	#define DRV_NAME "cs5536"

	enum {
	MSR_IDE_CFG = 0x51300010,
	PCI_IDE_CFG = 0x40,

	CFG = 0,
	DTC = 2,
	CAST = 3,
	ETC = 4,

	IDE_CFG_CHANEN = (1 << 1),
	IDE_CFG_CABLE = (1 << 17) \| (1 << 16),

	IDE_D0_SHIFT = 24,
	IDE_D1_SHIFT = 16,
	IDE_DRV_MASK = 0xff,

	IDE_CAST_D0_SHIFT = 6,
	IDE_CAST_D1_SHIFT = 4,
	IDE_CAST_DRV_MASK = 0x3,

	IDE_CAST_CMD_SHIFT = 24,
	IDE_CAST_CMD_MASK = 0xff,

	IDE_ETC_UDMA_MASK = 0xc0,
	};

	static int use_msr;

	static int cs5536_read(struct pci_dev pdev, int reg, u32 val)
	{
	if (unlikely(use_msr)) {
	u32 dummy;

	rdmsr(MSR_IDE_CFG + reg, *val, dummy);
	return 0;
	}

	return pci_read_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
	}

	static int cs5536_write(struct pci_dev *pdev, int reg, int val)
	{
	if (unlikely(use_msr)) {
	wrmsr(MSR_IDE_CFG + reg, val, 0);
	return 0;
	}

	return pci_write_config_dword(pdev, PCI_IDE_CFG + reg * 4, val);
	}

	static void cs5536_program_dtc(ide_drive_t *drive, u8 tim)
	{
	struct pci_dev *pdev = to_pci_dev(drive->hwif->dev);
	int dshift = (drive->dn & 1) ? IDE_D1_SHIFT : IDE_D0_SHIFT;
	u32 dtc;

	cs5536_read(pdev, DTC, &dtc);
	dtc &= ~(IDE_DRV_MASK << dshift);
	dtc \|= tim << dshift;
	cs5536_write(pdev, DTC, dtc);
	}

	/**
	* cs5536_cable_detect - detect cable type
	* @hwif: Port to detect on
	*
	* Perform cable detection for ATA66 capable cable.
	*
	* Returns a cable type.
	*/

	static u8 cs5536_cable_detect(ide_hwif_t *hwif)
	{
	struct pci_dev *pdev = to_pci_dev(hwif->dev);
	u32 cfg;

	cs5536_read(pdev, CFG, &cfg);

	if (cfg & IDE_CFG_CABLE)
	return ATA_CBL_PATA80;
	else
	return ATA_CBL_PATA40;
	}

	/**
	* cs5536_set_pio_mode - PIO timing setup
	* @drive: ATA device
	* @pio: PIO mode number
	*/

	static void cs5536_set_pio_mode(ide_drive_t *drive, const u8 pio)
	{
	static const u8 drv_timings[5] = {
	0x98, 0x55, 0x32, 0x21, 0x20,
	};

	static const u8 addr_timings[5] = {
	0x2, 0x1, 0x0, 0x0, 0x0,
	};

	static const u8 cmd_timings[5] = {
	0x99, 0x92, 0x90, 0x22, 0x20,
	};

	struct pci_dev *pdev = to_pci_dev(drive->hwif->dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	int cshift = (drive->dn & 1) ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
	u32 cast;
	u8 cmd_pio = pio;

	if (pair)
	cmd_pio = min(pio, ide_get_best_pio_mode(pair, 255, 4));

	drive->drive_data &= (IDE_DRV_MASK << 8);
	drive->drive_data \|= drv_timings[pio];

	cs5536_program_dtc(drive, drv_timings[pio]);

	cs5536_read(pdev, CAST, &cast);

	cast &= ~(IDE_CAST_DRV_MASK << cshift);
	cast \|= addr_timings[pio] << cshift;

	cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
	cast \|= cmd_timings[cmd_pio] << IDE_CAST_CMD_SHIFT;

	cs5536_write(pdev, CAST, cast);
	}

	/**
	* cs5536_set_dma_mode - DMA timing setup
	* @drive: ATA device
	* @mode: DMA mode
	*/

	static void cs5536_set_dma_mode(ide_drive_t *drive, const u8 mode)
	{
	static const u8 udma_timings[6] = {
	0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6,
	};

	static const u8 mwdma_timings[3] = {
	0x67, 0x21, 0x20,
	};

	struct pci_dev *pdev = to_pci_dev(drive->hwif->dev);
	int dshift = (drive->dn & 1) ? IDE_D1_SHIFT : IDE_D0_SHIFT;
	u32 etc;

	cs5536_read(pdev, ETC, &etc);

	if (mode >= XFER_UDMA_0) {
	etc &= ~(IDE_DRV_MASK << dshift);
	etc \|= udma_timings[mode - XFER_UDMA_0] << dshift;
	} else { /* MWDMA */
	etc &= ~(IDE_ETC_UDMA_MASK << dshift);
	drive->drive_data &= IDE_DRV_MASK;
	drive->drive_data \|= mwdma_timings[mode - XFER_MW_DMA_0] << 8;
	}

	cs5536_write(pdev, ETC, etc);
	}

	static void cs5536_dma_start(ide_drive_t *drive)
	{
	if (drive->current_speed < XFER_UDMA_0 &&
	(drive->drive_data >> 8) != (drive->drive_data & IDE_DRV_MASK))
	cs5536_program_dtc(drive, drive->drive_data >> 8);

	ide_dma_start(drive);
	}

	static int cs5536_dma_end(ide_drive_t *drive)
	{
	int ret = ide_dma_end(drive);

	if (drive->current_speed < XFER_UDMA_0 &&
	(drive->drive_data >> 8) != (drive->drive_data & IDE_DRV_MASK))
	cs5536_program_dtc(drive, drive->drive_data & IDE_DRV_MASK);

	return ret;
	}

	static const struct ide_port_ops cs5536_port_ops = {
	.set_pio_mode = cs5536_set_pio_mode,
	.set_dma_mode = cs5536_set_dma_mode,
	.cable_detect = cs5536_cable_detect,
	};

	static const struct ide_dma_ops cs5536_dma_ops = {
	.dma_host_set = ide_dma_host_set,
	.dma_setup = ide_dma_setup,
	.dma_start = cs5536_dma_start,
	.dma_end = cs5536_dma_end,
	.dma_test_irq = ide_dma_test_irq,
	.dma_lost_irq = ide_dma_lost_irq,
	.dma_timer_expiry = ide_dma_sff_timer_expiry,
	};

	static const struct ide_port_info cs5536_info = {
	.name = DRV_NAME,
	.port_ops = &cs5536_port_ops,
	.dma_ops = &cs5536_dma_ops,
	.host_flags = IDE_HFLAG_SINGLE,
	.pio_mask = ATA_PIO4,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = ATA_UDMA5,
	};

	/**
	* cs5536_init_one
	* @dev: PCI device
	* @id: Entry in match table
	*/

	static int cs5536_init_one(struct pci_dev dev, const struct pci_device_id id)
	{
	u32 cfg;

	if (use_msr)
	printk(KERN_INFO DRV_NAME ": Using MSR regs instead of PCI\n");

	cs5536_read(dev, CFG, &cfg);

	if ((cfg & IDE_CFG_CHANEN) == 0) {
	printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
	return -ENODEV;
	}

	return ide_pci_init_one(dev, &cs5536_info, NULL);
	}

	static const struct pci_device_id cs5536_pci_tbl[] = {
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), },
	{ },
	};

	static struct pci_driver cs5536_pci_driver = {
	.name = DRV_NAME,
	.id_table = cs5536_pci_tbl,
	.probe = cs5536_init_one,
	.remove = ide_pci_remove,
	.suspend = ide_pci_suspend,
	.resume = ide_pci_resume,
	};

	static int __init cs5536_init(void)
	{
	return pci_register_driver(&cs5536_pci_driver);
	}

	static void __exit cs5536_exit(void)
	{
	pci_unregister_driver(&cs5536_pci_driver);
	}

	MODULE_AUTHOR("Martin K. Petersen, Bartlomiej Zolnierkiewicz");
	MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, cs5536_pci_tbl);

	module_param_named(msr, use_msr, int, 0644);
	MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");

	module_init(cs5536_init);
	module_exit(cs5536_exit);