drivers/ata/pata_sil680.c - kernel/msm-4.19 - Gitiles

 /*
  * pata_sil680.c 	- SIL680 PATA for new ATA layer
  *			  (C) 2005 Red Hat Inc
  *			  Alan Cox <alan@redhat.com>
  *
  * based upon
  *
  * linux/drivers/ide/pci/siimage.c		Version 1.07	Nov 30, 2003
  *
  * Copyright (C) 2001-2002	Andre Hedrick <andre@linux-ide.org>
  * Copyright (C) 2003		Red Hat <alan@redhat.com>
  *
  *  May be copied or modified under the terms of the GNU General Public License
  *
  *  Documentation publically available.
  *
  *	If you have strange problems with nVidia chipset systems please
  *	see the SI support documentation and update your system BIOS
  *	if neccessary
  *
  * TODO
  *	If we know all our devices are LBA28 (or LBA28 sized)  we could use
  *	the command fifo mode.
  */

 #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 <scsi/scsi_host.h>
 #include <linux/libata.h>

 #define DRV_NAME "pata_sil680"
 #define DRV_VERSION "0.4.1"

 /**
  *	sil680_selreg		-	return register base
  *	@hwif: interface
  *	@r: config offset
  *
  *	Turn a config register offset into the right address in either
  *	PCI space or MMIO space to access the control register in question
  *	Thankfully this is a configuration operation so isnt performance
  *	criticial.
  */

 static unsigned long sil680_selreg(struct ata_port *ap, int r)
 {
 	unsigned long base = 0xA0 + r;
 	base += (ap->port_no << 4);
 	return base;
 }

 /**
  *	sil680_seldev		-	return register base
  *	@hwif: interface
  *	@r: config offset
  *
  *	Turn a config register offset into the right address in either
  *	PCI space or MMIO space to access the control register in question
  *	including accounting for the unit shift.
  */

 static unsigned long sil680_seldev(struct ata_port *ap, struct ata_device *adev, int r)
 {
 	unsigned long base = 0xA0 + r;
 	base += (ap->port_no << 4);
 	base |= adev->devno ? 2 : 0;
 	return base;
 }


 /**
  *	sil680_cable_detect	-	cable detection
  *	@ap: ATA port
  *
  *	Perform cable detection. The SIL680 stores this in PCI config
  *	space for us.
  */

 static int sil680_cable_detect(struct ata_port *ap) {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	unsigned long addr = sil680_selreg(ap, 0);
 	u8 ata66;
 	pci_read_config_byte(pdev, addr, &ata66);
 	if (ata66 & 1)
 		return ATA_CBL_PATA80;
 	else
 		return ATA_CBL_PATA40;
 }

 static int sil680_pre_reset(struct ata_port *ap)
 {
 	ap->cbl = sil680_cable_detect(ap);
 	return ata_std_prereset(ap);
 }

 /**
  *	sil680_bus_reset	-	reset the SIL680 bus
  *	@ap: ATA port to reset
  *
  *	Perform the SIL680 housekeeping when doing an ATA bus reset
  */

 static int sil680_bus_reset(struct ata_port *ap,unsigned int *classes)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	unsigned long addr = sil680_selreg(ap, 0);
 	u8 reset;

 	pci_read_config_byte(pdev, addr, &reset);
 	pci_write_config_byte(pdev, addr, reset | 0x03);
 	udelay(25);
 	pci_write_config_byte(pdev, addr, reset);
 	return ata_std_softreset(ap, classes);
 }

 static void sil680_error_handler(struct ata_port *ap)
 {
 	ata_bmdma_drive_eh(ap, sil680_pre_reset, sil680_bus_reset, NULL, ata_std_postreset);
 }

 /**
  *	sil680_set_piomode	-	set initial PIO mode data
  *	@ap: ATA interface
  *	@adev: ATA device
  *
  *	Program the SIL680 registers for PIO mode. Note that the task speed
  *	registers are shared between the devices so we must pick the lowest
  *	mode for command work.
  */

 static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	static u16 speed_p[5] = { 0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1 };
 	static u16 speed_t[5] = { 0x328A, 0x2283, 0x1281, 0x10C3, 0x10C1 };

 	unsigned long tfaddr = sil680_selreg(ap, 0x02);
 	unsigned long addr = sil680_seldev(ap, adev, 0x04);
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	int pio = adev->pio_mode - XFER_PIO_0;
 	int lowest_pio = pio;
 	u16 reg;

 	struct ata_device *pair = ata_dev_pair(adev);

 	if (pair != NULL && adev->pio_mode > pair->pio_mode)
 		lowest_pio = pair->pio_mode - XFER_PIO_0;

 	pci_write_config_word(pdev, addr, speed_p[pio]);
 	pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);

 	pci_read_config_word(pdev, tfaddr-2, &reg);
 	reg &= ~0x0200;			/* Clear IORDY */
 	if (ata_pio_need_iordy(adev))
 		reg |= 0x0200;		/* Enable IORDY */
 	pci_write_config_word(pdev, tfaddr-2, reg);
 }

 /**
  *	sil680_set_dmamode	-	set initial DMA mode data
  *	@ap: ATA interface
  *	@adev: ATA device
  *
  *	Program the MWDMA/UDMA modes for the sil680 k
  *	chipset. The MWDMA mode values are pulled from a lookup table
  *	while the chipset uses mode number for UDMA.
  */

 static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 {
 	static u8 ultra_table[2][7] = {
 		{ 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF },	/* 100MHz */
 		{ 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 },	/* 133Mhz */
 	};
 	static u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };

 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	unsigned long ma = sil680_seldev(ap, adev, 0x08);
 	unsigned long ua = sil680_seldev(ap, adev, 0x0C);
 	unsigned long addr_mask = 0x80 + 4 * ap->port_no;
 	int port_shift = adev->devno * 4;
 	u8 scsc, mode;
 	u16 multi, ultra;

 	pci_read_config_byte(pdev, 0x8A, &scsc);
 	pci_read_config_byte(pdev, addr_mask, &mode);
 	pci_read_config_word(pdev, ma, &multi);
 	pci_read_config_word(pdev, ua, &ultra);

 	/* Mask timing bits */
 	ultra &= ~0x3F;
 	mode &= ~(0x03 << port_shift);

 	/* Extract scsc */
 	scsc = (scsc & 0x30) ? 1: 0;

 	if (adev->dma_mode >= XFER_UDMA_0) {
 		multi = 0x10C1;
 		ultra |= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
 		mode |= (0x03 << port_shift);
 	} else {
 		multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
 		mode |= (0x02 << port_shift);
 	}
 	pci_write_config_byte(pdev, addr_mask, mode);
 	pci_write_config_word(pdev, ma, multi);
 	pci_write_config_word(pdev, ua, ultra);
 }

 static struct scsi_host_template sil680_sht = {
 	.module			= THIS_MODULE,
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
 	.emulated		= ATA_SHT_EMULATED,
 	.use_clustering		= ATA_SHT_USE_CLUSTERING,
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
 	.slave_destroy		= ata_scsi_slave_destroy,
 	.bios_param		= ata_std_bios_param,
 };

 static struct ata_port_operations sil680_port_ops = {
 	.port_disable	= ata_port_disable,
 	.set_piomode	= sil680_set_piomode,
 	.set_dmamode	= sil680_set_dmamode,
 	.mode_filter	= ata_pci_default_filter,
 	.tf_load	= ata_tf_load,
 	.tf_read	= ata_tf_read,
 	.check_status 	= ata_check_status,
 	.exec_command	= ata_exec_command,
 	.dev_select 	= ata_std_dev_select,

 	.freeze		= ata_bmdma_freeze,
 	.thaw		= ata_bmdma_thaw,
 	.error_handler	= sil680_error_handler,
 	.post_internal_cmd = ata_bmdma_post_internal_cmd,

 	.bmdma_setup 	= ata_bmdma_setup,
 	.bmdma_start 	= ata_bmdma_start,
 	.bmdma_stop	= ata_bmdma_stop,
 	.bmdma_status 	= ata_bmdma_status,

 	.qc_prep 	= ata_qc_prep,
 	.qc_issue	= ata_qc_issue_prot,

 	.data_xfer	= ata_pio_data_xfer,

 	.irq_handler	= ata_interrupt,
 	.irq_clear	= ata_bmdma_irq_clear,

 	.port_start	= ata_port_start,
 	.port_stop	= ata_port_stop,
 	.host_stop	= ata_host_stop
 };

 /**
  *	sil680_init_chip		-	chip setup
  *	@pdev: PCI device
  *
  *	Perform all the chip setup which must be done both when the device
  *	is powered up on boot and when we resume in case we resumed from RAM.
  *	Returns the final clock settings.
  */

 static u8 sil680_init_chip(struct pci_dev *pdev)
 {
 	u32 class_rev	= 0;
 	u8 tmpbyte	= 0;

         pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
         class_rev &= 0xff;
         /* FIXME: double check */
 	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, (class_rev) ? 1 : 255);

 	pci_write_config_byte(pdev, 0x80, 0x00);
 	pci_write_config_byte(pdev, 0x84, 0x00);

 	pci_read_config_byte(pdev, 0x8A, &tmpbyte);

 	printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
 			tmpbyte & 1, tmpbyte & 0x30);

 	switch(tmpbyte & 0x30) {
 		case 0x00:
 			/* 133 clock attempt to force it on */
 			pci_write_config_byte(pdev, 0x8A, tmpbyte|0x10);
 			break;
 		case 0x30:
 			/* if clocking is disabled */
 			/* 133 clock attempt to force it on */
 			pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
 			break;
 		case 0x10:
 			/* 133 already */
 			break;
 		case 0x20:
 			/* BIOS set PCI x2 clocking */
 			break;
 	}

 	pci_read_config_byte(pdev,   0x8A, &tmpbyte);
 	printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
 			tmpbyte & 1, tmpbyte & 0x30);

 	pci_write_config_byte(pdev,  0xA1, 0x72);
 	pci_write_config_word(pdev,  0xA2, 0x328A);
 	pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
 	pci_write_config_dword(pdev, 0xA8, 0x43924392);
 	pci_write_config_dword(pdev, 0xAC, 0x40094009);
 	pci_write_config_byte(pdev,  0xB1, 0x72);
 	pci_write_config_word(pdev,  0xB2, 0x328A);
 	pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
 	pci_write_config_dword(pdev, 0xB8, 0x43924392);
 	pci_write_config_dword(pdev, 0xBC, 0x40094009);

 	switch(tmpbyte & 0x30) {
 		case 0x00: printk(KERN_INFO "sil680: 100MHz clock.\n");break;
 		case 0x10: printk(KERN_INFO "sil680: 133MHz clock.\n");break;
 		case 0x20: printk(KERN_INFO "sil680: Using PCI clock.\n");break;
 		/* This last case is _NOT_ ok */
 		case 0x30: printk(KERN_ERR "sil680: Clock disabled ?\n");
 	}
 	return tmpbyte & 0x30;
 }

 static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	static struct ata_port_info info = {
 		.sht = &sil680_sht,
 		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 		.pio_mask = 0x1f,
 		.mwdma_mask = 0x07,
 		.udma_mask = 0x7f,
 		.port_ops = &sil680_port_ops
 	};
 	static struct ata_port_info info_slow = {
 		.sht = &sil680_sht,
 		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 		.pio_mask = 0x1f,
 		.mwdma_mask = 0x07,
 		.udma_mask = 0x3f,
 		.port_ops = &sil680_port_ops
 	};
 	static struct ata_port_info *port_info[2] = {&info, &info};
 	static int printed_version;

 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");

 	switch(sil680_init_chip(pdev))
 	{
 		case 0:
 			port_info[0] = port_info[1] = &info_slow;
 			break;
 		case 0x30:
 			return -ENODEV;
 	}
 	return ata_pci_init_one(pdev, port_info, 2);
 }

 static int sil680_reinit_one(struct pci_dev *pdev)
 {
 	sil680_init_chip(pdev);
 	return ata_pci_device_resume(pdev);
 }

 static const struct pci_device_id sil680[] = {
 	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },

 	{ },
 };

 static struct pci_driver sil680_pci_driver = {
 	.name 		= DRV_NAME,
 	.id_table	= sil680,
 	.probe 		= sil680_init_one,
 	.remove		= ata_pci_remove_one,
 	.suspend	= ata_pci_device_suspend,
 	.resume		= sil680_reinit_one,
 };

 static int __init sil680_init(void)
 {
 	return pci_register_driver(&sil680_pci_driver);
 }

 static void __exit sil680_exit(void)
 {
 	pci_unregister_driver(&sil680_pci_driver);
 }

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("low-level driver for SI680 PATA");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, sil680);
 MODULE_VERSION(DRV_VERSION);

 module_init(sil680_init);
 module_exit(sil680_exit);
	/*
	* pata_sil680.c - SIL680 PATA for new ATA layer
	* (C) 2005 Red Hat Inc
	* Alan Cox <alan@redhat.com>
	*
	* based upon
	*
	* linux/drivers/ide/pci/siimage.c Version 1.07 Nov 30, 2003
	*
	* Copyright (C) 2001-2002 Andre Hedrick <andre@linux-ide.org>
	* Copyright (C) 2003 Red Hat <alan@redhat.com>
	*
	* May be copied or modified under the terms of the GNU General Public License
	*
	* Documentation publically available.
	*
	* If you have strange problems with nVidia chipset systems please
	* see the SI support documentation and update your system BIOS
	* if neccessary
	*
	* TODO
	* If we know all our devices are LBA28 (or LBA28 sized) we could use
	* the command fifo mode.
	*/

	#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 <scsi/scsi_host.h>
	#include <linux/libata.h>

	#define DRV_NAME "pata_sil680"
	#define DRV_VERSION "0.4.1"

	/**
	* sil680_selreg - return register base
	* @hwif: interface
	* @r: config offset
	*
	* Turn a config register offset into the right address in either
	* PCI space or MMIO space to access the control register in question
	* Thankfully this is a configuration operation so isnt performance
	* criticial.
	*/

	static unsigned long sil680_selreg(struct ata_port *ap, int r)
	{
	unsigned long base = 0xA0 + r;
	base += (ap->port_no << 4);
	return base;
	}

	/**
	* sil680_seldev - return register base
	* @hwif: interface
	* @r: config offset
	*
	* Turn a config register offset into the right address in either
	* PCI space or MMIO space to access the control register in question
	* including accounting for the unit shift.
	*/

	static unsigned long sil680_seldev(struct ata_port ap, struct ata_device adev, int r)
	{
	unsigned long base = 0xA0 + r;
	base += (ap->port_no << 4);
	base \|= adev->devno ? 2 : 0;
	return base;
	}


	/**
	* sil680_cable_detect - cable detection
	* @ap: ATA port
	*
	* Perform cable detection. The SIL680 stores this in PCI config
	* space for us.
	*/

	static int sil680_cable_detect(struct ata_port *ap) {
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	unsigned long addr = sil680_selreg(ap, 0);
	u8 ata66;
	pci_read_config_byte(pdev, addr, &ata66);
	if (ata66 & 1)
	return ATA_CBL_PATA80;
	else
	return ATA_CBL_PATA40;
	}

	static int sil680_pre_reset(struct ata_port *ap)
	{
	ap->cbl = sil680_cable_detect(ap);
	return ata_std_prereset(ap);
	}

	/**
	* sil680_bus_reset - reset the SIL680 bus
	* @ap: ATA port to reset
	*
	* Perform the SIL680 housekeeping when doing an ATA bus reset
	*/

	static int sil680_bus_reset(struct ata_port ap,unsigned int classes)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	unsigned long addr = sil680_selreg(ap, 0);
	u8 reset;

	pci_read_config_byte(pdev, addr, &reset);
	pci_write_config_byte(pdev, addr, reset \| 0x03);
	udelay(25);
	pci_write_config_byte(pdev, addr, reset);
	return ata_std_softreset(ap, classes);
	}

	static void sil680_error_handler(struct ata_port *ap)
	{
	ata_bmdma_drive_eh(ap, sil680_pre_reset, sil680_bus_reset, NULL, ata_std_postreset);
	}

	/**
	* sil680_set_piomode - set initial PIO mode data
	* @ap: ATA interface
	* @adev: ATA device
	*
	* Program the SIL680 registers for PIO mode. Note that the task speed
	* registers are shared between the devices so we must pick the lowest
	* mode for command work.
	*/

	static void sil680_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	static u16 speed_p[5] = { 0x328A, 0x2283, 0x1104, 0x10C3, 0x10C1 };
	static u16 speed_t[5] = { 0x328A, 0x2283, 0x1281, 0x10C3, 0x10C1 };

	unsigned long tfaddr = sil680_selreg(ap, 0x02);
	unsigned long addr = sil680_seldev(ap, adev, 0x04);
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	int pio = adev->pio_mode - XFER_PIO_0;
	int lowest_pio = pio;
	u16 reg;

	struct ata_device *pair = ata_dev_pair(adev);

	if (pair != NULL && adev->pio_mode > pair->pio_mode)
	lowest_pio = pair->pio_mode - XFER_PIO_0;

	pci_write_config_word(pdev, addr, speed_p[pio]);
	pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);

	pci_read_config_word(pdev, tfaddr-2, &reg);
	reg &= ~0x0200; /* Clear IORDY */
	if (ata_pio_need_iordy(adev))
	reg \|= 0x0200; /* Enable IORDY */
	pci_write_config_word(pdev, tfaddr-2, reg);
	}

	/**
	* sil680_set_dmamode - set initial DMA mode data
	* @ap: ATA interface
	* @adev: ATA device
	*
	* Program the MWDMA/UDMA modes for the sil680 k
	* chipset. The MWDMA mode values are pulled from a lookup table
	* while the chipset uses mode number for UDMA.
	*/

	static void sil680_set_dmamode(struct ata_port ap, struct ata_device adev)
	{
	static u8 ultra_table[2][7] = {
	{ 0x0C, 0x07, 0x05, 0x04, 0x02, 0x01, 0xFF }, /* 100MHz */
	{ 0x0F, 0x0B, 0x07, 0x05, 0x03, 0x02, 0x01 }, /* 133Mhz */
	};
	static u16 dma_table[3] = { 0x2208, 0x10C2, 0x10C1 };

	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	unsigned long ma = sil680_seldev(ap, adev, 0x08);
	unsigned long ua = sil680_seldev(ap, adev, 0x0C);
	unsigned long addr_mask = 0x80 + 4 * ap->port_no;
	int port_shift = adev->devno * 4;
	u8 scsc, mode;
	u16 multi, ultra;

	pci_read_config_byte(pdev, 0x8A, &scsc);
	pci_read_config_byte(pdev, addr_mask, &mode);
	pci_read_config_word(pdev, ma, &multi);
	pci_read_config_word(pdev, ua, &ultra);

	/* Mask timing bits */
	ultra &= ~0x3F;
	mode &= ~(0x03 << port_shift);

	/* Extract scsc */
	scsc = (scsc & 0x30) ? 1: 0;

	if (adev->dma_mode >= XFER_UDMA_0) {
	multi = 0x10C1;
	ultra \|= ultra_table[scsc][adev->dma_mode - XFER_UDMA_0];
	mode \|= (0x03 << port_shift);
	} else {
	multi = dma_table[adev->dma_mode - XFER_MW_DMA_0];
	mode \|= (0x02 << port_shift);
	}
	pci_write_config_byte(pdev, addr_mask, mode);
	pci_write_config_word(pdev, ma, multi);
	pci_write_config_word(pdev, ua, ultra);
	}

	static struct scsi_host_template sil680_sht = {
	.module = THIS_MODULE,
	.name = DRV_NAME,
	.ioctl = ata_scsi_ioctl,
	.queuecommand = ata_scsi_queuecmd,
	.can_queue = ATA_DEF_QUEUE,
	.this_id = ATA_SHT_THIS_ID,
	.sg_tablesize = LIBATA_MAX_PRD,
	.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
	.emulated = ATA_SHT_EMULATED,
	.use_clustering = ATA_SHT_USE_CLUSTERING,
	.proc_name = DRV_NAME,
	.dma_boundary = ATA_DMA_BOUNDARY,
	.slave_configure = ata_scsi_slave_config,
	.slave_destroy = ata_scsi_slave_destroy,
	.bios_param = ata_std_bios_param,
	};

	static struct ata_port_operations sil680_port_ops = {
	.port_disable = ata_port_disable,
	.set_piomode = sil680_set_piomode,
	.set_dmamode = sil680_set_dmamode,
	.mode_filter = ata_pci_default_filter,
	.tf_load = ata_tf_load,
	.tf_read = ata_tf_read,
	.check_status = ata_check_status,
	.exec_command = ata_exec_command,
	.dev_select = ata_std_dev_select,

	.freeze = ata_bmdma_freeze,
	.thaw = ata_bmdma_thaw,
	.error_handler = sil680_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,

	.bmdma_setup = ata_bmdma_setup,
	.bmdma_start = ata_bmdma_start,
	.bmdma_stop = ata_bmdma_stop,
	.bmdma_status = ata_bmdma_status,

	.qc_prep = ata_qc_prep,
	.qc_issue = ata_qc_issue_prot,

	.data_xfer = ata_pio_data_xfer,

	.irq_handler = ata_interrupt,
	.irq_clear = ata_bmdma_irq_clear,

	.port_start = ata_port_start,
	.port_stop = ata_port_stop,
	.host_stop = ata_host_stop
	};

	/**
	* sil680_init_chip - chip setup
	* @pdev: PCI device
	*
	* Perform all the chip setup which must be done both when the device
	* is powered up on boot and when we resume in case we resumed from RAM.
	* Returns the final clock settings.
	*/

	static u8 sil680_init_chip(struct pci_dev *pdev)
	{
	u32 class_rev = 0;
	u8 tmpbyte = 0;

	pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
	class_rev &= 0xff;
	/* FIXME: double check */
	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, (class_rev) ? 1 : 255);

	pci_write_config_byte(pdev, 0x80, 0x00);
	pci_write_config_byte(pdev, 0x84, 0x00);

	pci_read_config_byte(pdev, 0x8A, &tmpbyte);

	printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
	tmpbyte & 1, tmpbyte & 0x30);

	switch(tmpbyte & 0x30) {
	case 0x00:
	/* 133 clock attempt to force it on */
	pci_write_config_byte(pdev, 0x8A, tmpbyte\|0x10);
	break;
	case 0x30:
	/* if clocking is disabled */
	/* 133 clock attempt to force it on */
	pci_write_config_byte(pdev, 0x8A, tmpbyte & ~0x20);
	break;
	case 0x10:
	/* 133 already */
	break;
	case 0x20:
	/* BIOS set PCI x2 clocking */
	break;
	}

	pci_read_config_byte(pdev, 0x8A, &tmpbyte);
	printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
	tmpbyte & 1, tmpbyte & 0x30);

	pci_write_config_byte(pdev, 0xA1, 0x72);
	pci_write_config_word(pdev, 0xA2, 0x328A);
	pci_write_config_dword(pdev, 0xA4, 0x62DD62DD);
	pci_write_config_dword(pdev, 0xA8, 0x43924392);
	pci_write_config_dword(pdev, 0xAC, 0x40094009);
	pci_write_config_byte(pdev, 0xB1, 0x72);
	pci_write_config_word(pdev, 0xB2, 0x328A);
	pci_write_config_dword(pdev, 0xB4, 0x62DD62DD);
	pci_write_config_dword(pdev, 0xB8, 0x43924392);
	pci_write_config_dword(pdev, 0xBC, 0x40094009);

	switch(tmpbyte & 0x30) {
	case 0x00: printk(KERN_INFO "sil680: 100MHz clock.\n");break;
	case 0x10: printk(KERN_INFO "sil680: 133MHz clock.\n");break;
	case 0x20: printk(KERN_INFO "sil680: Using PCI clock.\n");break;
	/* This last case is _NOT_ ok */
	case 0x30: printk(KERN_ERR "sil680: Clock disabled ?\n");
	}
	return tmpbyte & 0x30;
	}

	static int sil680_init_one(struct pci_dev pdev, const struct pci_device_id id)
	{
	static struct ata_port_info info = {
	.sht = &sil680_sht,
	.flags = ATA_FLAG_SLAVE_POSS \| ATA_FLAG_SRST,
	.pio_mask = 0x1f,
	.mwdma_mask = 0x07,
	.udma_mask = 0x7f,
	.port_ops = &sil680_port_ops
	};
	static struct ata_port_info info_slow = {
	.sht = &sil680_sht,
	.flags = ATA_FLAG_SLAVE_POSS \| ATA_FLAG_SRST,
	.pio_mask = 0x1f,
	.mwdma_mask = 0x07,
	.udma_mask = 0x3f,
	.port_ops = &sil680_port_ops
	};
	static struct ata_port_info *port_info[2] = {&info, &info};
	static int printed_version;

	if (!printed_version++)
	dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");

	switch(sil680_init_chip(pdev))
	{
	case 0:
	port_info[0] = port_info[1] = &info_slow;
	break;
	case 0x30:
	return -ENODEV;
	}
	return ata_pci_init_one(pdev, port_info, 2);
	}

	static int sil680_reinit_one(struct pci_dev *pdev)
	{
	sil680_init_chip(pdev);
	return ata_pci_device_resume(pdev);
	}

	static const struct pci_device_id sil680[] = {
	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },

	{ },
	};

	static struct pci_driver sil680_pci_driver = {
	.name = DRV_NAME,
	.id_table = sil680,
	.probe = sil680_init_one,
	.remove = ata_pci_remove_one,
	.suspend = ata_pci_device_suspend,
	.resume = sil680_reinit_one,
	};

	static int __init sil680_init(void)
	{
	return pci_register_driver(&sil680_pci_driver);
	}

	static void __exit sil680_exit(void)
	{
	pci_unregister_driver(&sil680_pci_driver);
	}

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("low-level driver for SI680 PATA");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, sil680);
	MODULE_VERSION(DRV_VERSION);

	module_init(sil680_init);
	module_exit(sil680_exit);