drivers/ata/pata_cs5536.c - kernel/msm - Gitiles

 /*
  * pata_cs5536.c	- CS5536 PATA for new ATA layer
  *			  (C) 2007 Martin K. Petersen <mkp@mkp.net>
  *
  * 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/blkdev.h>
 #include <linux/delay.h>
 #include <linux/libata.h>
 #include <scsi/scsi_host.h>
 #include <asm/msr.h>

 #define DRV_NAME	"pata_cs5536"
 #define DRV_VERSION	"0.0.7"

 enum {
 	CFG			= 0,
 	DTC			= 1,
 	CAST			= 2,
 	ETC			= 3,

 	MSR_IDE_BASE		= 0x51300000,
 	MSR_IDE_CFG		= (MSR_IDE_BASE + 0x10),
 	MSR_IDE_DTC		= (MSR_IDE_BASE + 0x12),
 	MSR_IDE_CAST		= (MSR_IDE_BASE + 0x13),
 	MSR_IDE_ETC		= (MSR_IDE_BASE + 0x14),

 	PCI_IDE_CFG		= 0x40,
 	PCI_IDE_DTC		= 0x48,
 	PCI_IDE_CAST		= 0x4c,
 	PCI_IDE_ETC		= 0x50,

 	IDE_CFG_CHANEN		= 0x2,
 	IDE_CFG_CABLE		= 0x10000,

 	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_MASK	= 0xff,
 	IDE_CAST_CMD_SHIFT	= 24,

 	IDE_ETC_NODMA		= 0x03,
 };

 static int use_msr;

 static const u32 msr_reg[4] = {
 	MSR_IDE_CFG, MSR_IDE_DTC, MSR_IDE_CAST, MSR_IDE_ETC,
 };

 static const u8 pci_reg[4] = {
 	PCI_IDE_CFG, PCI_IDE_DTC, PCI_IDE_CAST, PCI_IDE_ETC,
 };

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

 		rdmsr(msr_reg[reg], *val, dummy);
 		return 0;
 	}

 	return pci_read_config_dword(pdev, pci_reg[reg], val);
 }

 static inline int cs5536_write(struct pci_dev *pdev, int reg, int val)
 {
 	if (unlikely(use_msr)) {
 		wrmsr(msr_reg[reg], val, 0);
 		return 0;
 	}

 	return pci_write_config_dword(pdev, pci_reg[reg], val);
 }

 /**
  *	cs5536_cable_detect	-	detect cable type
  *	@ap: Port to detect on
  *	@deadline: deadline jiffies for the operation
  *
  *	Perform cable detection for ATA66 capable cable. Return a libata
  *	cable type.
  */

 static int cs5536_cable_detect(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	u32 cfg;

 	cs5536_read(pdev, CFG, &cfg);

 	if (cfg & (IDE_CFG_CABLE << ap->port_no))
 		return ATA_CBL_PATA80;
 	else
 		return ATA_CBL_PATA40;
 }

 /**
  *	cs5536_set_piomode		-	PIO setup
  *	@ap: ATA interface
  *	@adev: device on the interface
  */

 static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	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(ap->host->dev);
 	struct ata_device *pair = ata_dev_pair(adev);
 	int mode = adev->pio_mode - XFER_PIO_0;
 	int cmdmode = mode;
 	int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
 	int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
 	u32 dtc, cast, etc;

 	if (pair)
 		cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);

 	cs5536_read(pdev, DTC, &dtc);
 	cs5536_read(pdev, CAST, &cast);
 	cs5536_read(pdev, ETC, &etc);

 	dtc &= ~(IDE_DRV_MASK << dshift);
 	dtc |= drv_timings[mode] << dshift;

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

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

 	etc &= ~(IDE_DRV_MASK << dshift);
 	etc |= IDE_ETC_NODMA << dshift;

 	cs5536_write(pdev, DTC, dtc);
 	cs5536_write(pdev, CAST, cast);
 	cs5536_write(pdev, ETC, etc);
 }

 /**
  *	cs5536_set_dmamode		-	DMA timing setup
  *	@ap: ATA interface
  *	@adev: Device being configured
  *
  */

 static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 {
 	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(ap->host->dev);
 	u32 dtc, etc;
 	int mode = adev->dma_mode;
 	int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;

 	if (mode >= XFER_UDMA_0) {
 		cs5536_read(pdev, ETC, &etc);

 		etc &= ~(IDE_DRV_MASK << dshift);
 		etc |= udma_timings[mode - XFER_UDMA_0] << dshift;

 		cs5536_write(pdev, ETC, etc);
 	} else { /* MWDMA */
 		cs5536_read(pdev, DTC, &dtc);

 		dtc &= ~(IDE_DRV_MASK << dshift);
 		dtc |= mwdma_timings[mode - XFER_MW_DMA_0] << dshift;

 		cs5536_write(pdev, DTC, dtc);
 	}
 }

 static struct scsi_host_template cs5536_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 };

 static struct ata_port_operations cs5536_port_ops = {
 	.inherits		= &ata_bmdma_port_ops,
 	.cable_detect		= cs5536_cable_detect,
 	.set_piomode		= cs5536_set_piomode,
 	.set_dmamode		= cs5536_set_dmamode,
 };

 /**
  *	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)
 {
 	static const struct ata_port_info info = {
 		.sht = &cs5536_sht,
 		.flags = ATA_FLAG_SLAVE_POSS,
 		.pio_mask = 0x1f,
 		.mwdma_mask = 0x07,
 		.udma_mask = ATA_UDMA5,
 		.port_ops = &cs5536_port_ops,
 	};

 	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 	u32 cfg;

 	if (use_msr)
 		printk(KERN_ERR 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 ata_pci_init_one(dev, ppi);
 }

 static const struct pci_device_id cs5536[] = {
 	{ PCI_VDEVICE(AMD,	PCI_DEVICE_ID_AMD_CS5536_IDE), },
 	{ },
 };

 static struct pci_driver cs5536_pci_driver = {
 	.name		= DRV_NAME,
 	.id_table	= cs5536,
 	.probe		= cs5536_init_one,
 	.remove		= ata_pci_remove_one,
 #ifdef CONFIG_PM
 	.suspend	= ata_pci_device_suspend,
 	.resume		= ata_pci_device_resume,
 #endif
 };

 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");
 MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, cs5536);
 MODULE_VERSION(DRV_VERSION);
 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);
	/*
	* pata_cs5536.c - CS5536 PATA for new ATA layer
	* (C) 2007 Martin K. Petersen <mkp@mkp.net>
	*
	* 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/blkdev.h>
	#include <linux/delay.h>
	#include <linux/libata.h>
	#include <scsi/scsi_host.h>
	#include <asm/msr.h>

	#define DRV_NAME "pata_cs5536"
	#define DRV_VERSION "0.0.7"

	enum {
	CFG = 0,
	DTC = 1,
	CAST = 2,
	ETC = 3,

	MSR_IDE_BASE = 0x51300000,
	MSR_IDE_CFG = (MSR_IDE_BASE + 0x10),
	MSR_IDE_DTC = (MSR_IDE_BASE + 0x12),
	MSR_IDE_CAST = (MSR_IDE_BASE + 0x13),
	MSR_IDE_ETC = (MSR_IDE_BASE + 0x14),

	PCI_IDE_CFG = 0x40,
	PCI_IDE_DTC = 0x48,
	PCI_IDE_CAST = 0x4c,
	PCI_IDE_ETC = 0x50,

	IDE_CFG_CHANEN = 0x2,
	IDE_CFG_CABLE = 0x10000,

	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_MASK = 0xff,
	IDE_CAST_CMD_SHIFT = 24,

	IDE_ETC_NODMA = 0x03,
	};

	static int use_msr;

	static const u32 msr_reg[4] = {
	MSR_IDE_CFG, MSR_IDE_DTC, MSR_IDE_CAST, MSR_IDE_ETC,
	};

	static const u8 pci_reg[4] = {
	PCI_IDE_CFG, PCI_IDE_DTC, PCI_IDE_CAST, PCI_IDE_ETC,
	};

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

	rdmsr(msr_reg[reg], *val, dummy);
	return 0;
	}

	return pci_read_config_dword(pdev, pci_reg[reg], val);
	}

	static inline int cs5536_write(struct pci_dev *pdev, int reg, int val)
	{
	if (unlikely(use_msr)) {
	wrmsr(msr_reg[reg], val, 0);
	return 0;
	}

	return pci_write_config_dword(pdev, pci_reg[reg], val);
	}

	/**
	* cs5536_cable_detect - detect cable type
	* @ap: Port to detect on
	* @deadline: deadline jiffies for the operation
	*
	* Perform cable detection for ATA66 capable cable. Return a libata
	* cable type.
	*/

	static int cs5536_cable_detect(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u32 cfg;

	cs5536_read(pdev, CFG, &cfg);

	if (cfg & (IDE_CFG_CABLE << ap->port_no))
	return ATA_CBL_PATA80;
	else
	return ATA_CBL_PATA40;
	}

	/**
	* cs5536_set_piomode - PIO setup
	* @ap: ATA interface
	* @adev: device on the interface
	*/

	static void cs5536_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	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(ap->host->dev);
	struct ata_device *pair = ata_dev_pair(adev);
	int mode = adev->pio_mode - XFER_PIO_0;
	int cmdmode = mode;
	int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;
	int cshift = adev->devno ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
	u32 dtc, cast, etc;

	if (pair)
	cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);

	cs5536_read(pdev, DTC, &dtc);
	cs5536_read(pdev, CAST, &cast);
	cs5536_read(pdev, ETC, &etc);

	dtc &= ~(IDE_DRV_MASK << dshift);
	dtc \|= drv_timings[mode] << dshift;

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

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

	etc &= ~(IDE_DRV_MASK << dshift);
	etc \|= IDE_ETC_NODMA << dshift;

	cs5536_write(pdev, DTC, dtc);
	cs5536_write(pdev, CAST, cast);
	cs5536_write(pdev, ETC, etc);
	}

	/**
	* cs5536_set_dmamode - DMA timing setup
	* @ap: ATA interface
	* @adev: Device being configured
	*
	*/

	static void cs5536_set_dmamode(struct ata_port ap, struct ata_device adev)
	{
	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(ap->host->dev);
	u32 dtc, etc;
	int mode = adev->dma_mode;
	int dshift = adev->devno ? IDE_D1_SHIFT : IDE_D0_SHIFT;

	if (mode >= XFER_UDMA_0) {
	cs5536_read(pdev, ETC, &etc);

	etc &= ~(IDE_DRV_MASK << dshift);
	etc \|= udma_timings[mode - XFER_UDMA_0] << dshift;

	cs5536_write(pdev, ETC, etc);
	} else { /* MWDMA */
	cs5536_read(pdev, DTC, &dtc);

	dtc &= ~(IDE_DRV_MASK << dshift);
	dtc \|= mwdma_timings[mode - XFER_MW_DMA_0] << dshift;

	cs5536_write(pdev, DTC, dtc);
	}
	}

	static struct scsi_host_template cs5536_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
	};

	static struct ata_port_operations cs5536_port_ops = {
	.inherits = &ata_bmdma_port_ops,
	.cable_detect = cs5536_cable_detect,
	.set_piomode = cs5536_set_piomode,
	.set_dmamode = cs5536_set_dmamode,
	};

	/**
	* 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)
	{
	static const struct ata_port_info info = {
	.sht = &cs5536_sht,
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = 0x1f,
	.mwdma_mask = 0x07,
	.udma_mask = ATA_UDMA5,
	.port_ops = &cs5536_port_ops,
	};

	const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
	u32 cfg;

	if (use_msr)
	printk(KERN_ERR 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 ata_pci_init_one(dev, ppi);
	}

	static const struct pci_device_id cs5536[] = {
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), },
	{ },
	};

	static struct pci_driver cs5536_pci_driver = {
	.name = DRV_NAME,
	.id_table = cs5536,
	.probe = cs5536_init_one,
	.remove = ata_pci_remove_one,
	#ifdef CONFIG_PM
	.suspend = ata_pci_device_suspend,
	.resume = ata_pci_device_resume,
	#endif
	};

	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");
	MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, cs5536);
	MODULE_VERSION(DRV_VERSION);
	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);