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

 /*
  * pata_optidma.c 	- Opti DMA PATA for new ATA layer
  *			  (C) 2006 Red Hat Inc
  *			  Alan Cox <alan@redhat.com>
  *
  *	The Opti DMA controllers are related to the older PIO PCI controllers
  *	and indeed the VLB ones. The main differences are that the timing
  *	numbers are now based off PCI clocks not VLB and differ, and that
  *	MWDMA is supported.
  *
  *	This driver should support Viper-N+, FireStar, FireStar Plus.
  *
  *	These devices support virtual DMA for read (aka the CS5520). Later
  *	chips support UDMA33, but only if the rest of the board logic does,
  *	so you have to get this right. We don't support the virtual DMA
  *	but we do handle UDMA.
  *
  *	Bits that are worth knowing
  *		Most control registers are shadowed into I/O registers
  *		0x1F5 bit 0 tells you if the PCI/VLB clock is 33 or 25Mhz
  *		Virtual DMA registers *move* between rev 0x02 and rev 0x10
  *		UDMA requires a 66MHz FSB
  *
  */

 #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_optidma"
 #define DRV_VERSION "0.2.4"

 enum {
 	READ_REG	= 0,	/* index of Read cycle timing register */
 	WRITE_REG 	= 1,	/* index of Write cycle timing register */
 	CNTRL_REG 	= 3,	/* index of Control register */
 	STRAP_REG 	= 5,	/* index of Strap register */
 	MISC_REG 	= 6	/* index of Miscellaneous register */
 };

 static int pci_clock;	/* 0 = 33 1 = 25 */

 /**
  *	optidma_pre_reset		-	probe begin
  *	@ap: ATA port
  *
  *	Set up cable type and use generic probe init
  */

 static int optidma_pre_reset(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	static const struct pci_bits optidma_enable_bits = {
 		0x40, 1, 0x08, 0x00
 	};

 	if (ap->port_no && !pci_test_config_bits(pdev, &optidma_enable_bits))
 		return -ENOENT;

 	ap->cbl = ATA_CBL_PATA40;
 	return ata_std_prereset(ap);
 }

 /**
  *	optidma_probe_reset		-	probe reset
  *	@ap: ATA port
  *
  *	Perform the ATA probe and bus reset sequence plus specific handling
  *	for this hardware. The Opti needs little handling - we have no UDMA66
  *	capability that needs cable detection. All we must do is check the port
  *	is enabled.
  */

 static void optidma_error_handler(struct ata_port *ap)
 {
 	ata_bmdma_drive_eh(ap, optidma_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
 }

 /**
  *	optidma_unlock		-	unlock control registers
  *	@ap: ATA port
  *
  *	Unlock the control register block for this adapter. Registers must not
  *	be unlocked in a situation where libata might look at them.
  */

 static void optidma_unlock(struct ata_port *ap)
 {
 	void __iomem *regio = ap->ioaddr.cmd_addr;

 	/* These 3 unlock the control register access */
 	ioread16(regio + 1);
 	ioread16(regio + 1);
 	iowrite8(3, regio + 2);
 }

 /**
  *	optidma_lock		-	issue temporary relock
  *	@ap: ATA port
  *
  *	Re-lock the configuration register settings.
  */

 static void optidma_lock(struct ata_port *ap)
 {
 	void __iomem *regio = ap->ioaddr.cmd_addr;

 	/* Relock */
 	iowrite8(0x83, regio + 2);
 }

 /**
  *	optidma_set_mode	-	set mode data
  *	@ap: ATA interface
  *	@adev: ATA device
  *	@mode: Mode to set
  *
  *	Called to do the DMA or PIO mode setup. Timing numbers are all
  *	pre computed to keep the code clean. There are two tables depending
  *	on the hardware clock speed.
  *
  *	WARNING: While we do this the IDE registers vanish. If we take an
  *	IRQ here we depend on the host set locking to avoid catastrophe.
  */

 static void optidma_set_mode(struct ata_port *ap, struct ata_device *adev, u8 mode)
 {
 	struct ata_device *pair = ata_dev_pair(adev);
 	int pio = adev->pio_mode - XFER_PIO_0;
 	int dma = adev->dma_mode - XFER_MW_DMA_0;
 	void __iomem *regio = ap->ioaddr.cmd_addr;
 	u8 addr;

 	/* Address table precomputed with a DCLK of 2 */
 	static const u8 addr_timing[2][5] = {
 		{ 0x30, 0x20, 0x20, 0x10, 0x10 },
 		{ 0x20, 0x20, 0x10, 0x10, 0x10 }
 	};
 	static const u8 data_rec_timing[2][5] = {
 		{ 0x59, 0x46, 0x30, 0x20, 0x20 },
 		{ 0x46, 0x32, 0x20, 0x20, 0x10 }
 	};
 	static const u8 dma_data_rec_timing[2][3] = {
 		{ 0x76, 0x20, 0x20 },
 		{ 0x54, 0x20, 0x10 }
 	};

 	/* Switch from IDE to control mode */
 	optidma_unlock(ap);


 	/*
  	 *	As with many controllers the address setup time is shared
  	 *	and must suit both devices if present. FIXME: Check if we
  	 *	need to look at slowest of PIO/DMA mode of either device
 	 */

 	if (mode >= XFER_MW_DMA_0)
 		addr = 0;
 	else
 		addr = addr_timing[pci_clock][pio];

 	if (pair) {
 		u8 pair_addr;
 		/* Hardware constraint */
 		if (pair->dma_mode)
 			pair_addr = 0;
 		else
 			pair_addr = addr_timing[pci_clock][pair->pio_mode - XFER_PIO_0];
 		if (pair_addr > addr)
 			addr = pair_addr;
 	}

 	/* Commence primary programming sequence */
 	/* First we load the device number into the timing select */
 	iowrite8(adev->devno, regio + MISC_REG);
 	/* Now we load the data timings into read data/write data */
 	if (mode < XFER_MW_DMA_0) {
 		iowrite8(data_rec_timing[pci_clock][pio], regio + READ_REG);
 		iowrite8(data_rec_timing[pci_clock][pio], regio + WRITE_REG);
 	} else if (mode < XFER_UDMA_0) {
 		iowrite8(dma_data_rec_timing[pci_clock][dma], regio + READ_REG);
 		iowrite8(dma_data_rec_timing[pci_clock][dma], regio + WRITE_REG);
 	}
 	/* Finally we load the address setup into the misc register */
 	iowrite8(addr | adev->devno, regio + MISC_REG);

 	/* Programming sequence complete, timing 0 dev 0, timing 1 dev 1 */
 	iowrite8(0x85, regio + CNTRL_REG);

 	/* Switch back to IDE mode */
 	optidma_lock(ap);

 	/* Note: at this point our programming is incomplete. We are
 	   not supposed to program PCI 0x43 "things we hacked onto the chip"
 	   until we've done both sets of PIO/DMA timings */
 }

 /**
  *	optiplus_set_mode	-	DMA setup for Firestar Plus
  *	@ap: ATA port
  *	@adev: device
  *	@mode: desired mode
  *
  *	The Firestar plus has additional UDMA functionality for UDMA0-2 and
  *	requires we do some additional work. Because the base work we must do
  *	is mostly shared we wrap the Firestar setup functionality in this
  *	one
  */

 static void optiplus_set_mode(struct ata_port *ap, struct ata_device *adev, u8 mode)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	u8 udcfg;
 	u8 udslave;
 	int dev2 = 2 * adev->devno;
 	int unit = 2 * ap->port_no + adev->devno;
 	int udma = mode - XFER_UDMA_0;

 	pci_read_config_byte(pdev, 0x44, &udcfg);
 	if (mode <= XFER_UDMA_0) {
 		udcfg &= ~(1 << unit);
 		optidma_set_mode(ap, adev, adev->dma_mode);
 	} else {
 		udcfg |=  (1 << unit);
 		if (ap->port_no) {
 			pci_read_config_byte(pdev, 0x45, &udslave);
 			udslave &= ~(0x03 << dev2);
 			udslave |= (udma << dev2);
 			pci_write_config_byte(pdev, 0x45, udslave);
 		} else {
 			udcfg &= ~(0x30 << dev2);
 			udcfg |= (udma << dev2);
 		}
 	}
 	pci_write_config_byte(pdev, 0x44, udcfg);
 }

 /**
  *	optidma_set_pio_mode	-	PIO setup callback
  *	@ap: ATA port
  *	@adev: Device
  *
  *	The libata core provides separate functions for handling PIO and
  *	DMA programming. The architecture of the Firestar makes it easier
  *	for us to have a common function so we provide wrappers
  */

 static void optidma_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
 {
 	optidma_set_mode(ap, adev, adev->pio_mode);
 }

 /**
  *	optidma_set_dma_mode	-	DMA setup callback
  *	@ap: ATA port
  *	@adev: Device
  *
  *	The libata core provides separate functions for handling PIO and
  *	DMA programming. The architecture of the Firestar makes it easier
  *	for us to have a common function so we provide wrappers
  */

 static void optidma_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
 {
 	optidma_set_mode(ap, adev, adev->dma_mode);
 }

 /**
  *	optiplus_set_pio_mode	-	PIO setup callback
  *	@ap: ATA port
  *	@adev: Device
  *
  *	The libata core provides separate functions for handling PIO and
  *	DMA programming. The architecture of the Firestar makes it easier
  *	for us to have a common function so we provide wrappers
  */

 static void optiplus_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
 {
 	optiplus_set_mode(ap, adev, adev->pio_mode);
 }

 /**
  *	optiplus_set_dma_mode	-	DMA setup callback
  *	@ap: ATA port
  *	@adev: Device
  *
  *	The libata core provides separate functions for handling PIO and
  *	DMA programming. The architecture of the Firestar makes it easier
  *	for us to have a common function so we provide wrappers
  */

 static void optiplus_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
 {
 	optiplus_set_mode(ap, adev, adev->dma_mode);
 }

 /**
  *	optidma_make_bits	-	PCI setup helper
  *	@adev: ATA device
  *
  *	Turn the ATA device setup into PCI configuration bits
  *	for register 0x43 and return the two bits needed.
  */

 static u8 optidma_make_bits43(struct ata_device *adev)
 {
 	static const u8 bits43[5] = {
 		0, 0, 0, 1, 2
 	};
 	if (!ata_dev_enabled(adev))
 		return 0;
 	if (adev->dma_mode)
 		return adev->dma_mode - XFER_MW_DMA_0;
 	return bits43[adev->pio_mode - XFER_PIO_0];
 }

 /**
  *	optidma_post_set_mode	-	finalize PCI setup
  *	@ap: port to set up
  *
  *	Finalise the configuration by writing the nibble of extra bits
  *	of data into the chip.
  */

 static void optidma_post_set_mode(struct ata_port *ap)
 {
 	u8 r;
 	int nybble = 4 * ap->port_no;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

 	pci_read_config_byte(pdev, 0x43, &r);

 	r &= (0x0F << nybble);
 	r |= (optidma_make_bits43(&ap->device[0]) +
 	     (optidma_make_bits43(&ap->device[0]) << 2)) << nybble;

 	pci_write_config_byte(pdev, 0x43, r);
 }

 static struct scsi_host_template optidma_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,
 #ifdef CONFIG_PM
 	.resume			= ata_scsi_device_resume,
 	.suspend		= ata_scsi_device_suspend,
 #endif
 };

 static struct ata_port_operations optidma_port_ops = {
 	.port_disable	= ata_port_disable,
 	.set_piomode	= optidma_set_pio_mode,
 	.set_dmamode	= optidma_set_dma_mode,

 	.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,
 	.post_internal_cmd = ata_bmdma_post_internal_cmd,
 	.error_handler	= optidma_error_handler,
 	.post_set_mode	= optidma_post_set_mode,

 	.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_data_xfer,

 	.irq_handler	= ata_interrupt,
 	.irq_clear	= ata_bmdma_irq_clear,
 	.irq_on		= ata_irq_on,
 	.irq_ack	= ata_irq_ack,

 	.port_start	= ata_port_start,
 };

 static struct ata_port_operations optiplus_port_ops = {
 	.port_disable	= ata_port_disable,
 	.set_piomode	= optiplus_set_pio_mode,
 	.set_dmamode	= optiplus_set_dma_mode,

 	.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,
 	.post_internal_cmd = ata_bmdma_post_internal_cmd,
 	.error_handler	= optidma_error_handler,
 	.post_set_mode	= optidma_post_set_mode,

 	.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_data_xfer,

 	.irq_handler	= ata_interrupt,
 	.irq_clear	= ata_bmdma_irq_clear,
 	.irq_on		= ata_irq_on,
 	.irq_ack	= ata_irq_ack,

 	.port_start	= ata_port_start,
 };

 /**
  *	optiplus_with_udma	-	Look for UDMA capable setup
  *	@pdev; ATA controller
  */

 static int optiplus_with_udma(struct pci_dev *pdev)
 {
 	u8 r;
 	int ret = 0;
 	int ioport = 0x22;
 	struct pci_dev *dev1;

 	/* Find function 1 */
 	dev1 = pci_get_device(0x1045, 0xC701, NULL);
 	if(dev1 == NULL)
 		return 0;

 	/* Rev must be >= 0x10 */
 	pci_read_config_byte(dev1, 0x08, &r);
 	if (r < 0x10)
 		goto done_nomsg;
 	/* Read the chipset system configuration to check our mode */
 	pci_read_config_byte(dev1, 0x5F, &r);
 	ioport |= (r << 8);
 	outb(0x10, ioport);
 	/* Must be 66Mhz sync */
 	if ((inb(ioport + 2) & 1) == 0)
 		goto done;

 	/* Check the ATA arbitration/timing is suitable */
 	pci_read_config_byte(pdev, 0x42, &r);
 	if ((r & 0x36) != 0x36)
 		goto done;
 	pci_read_config_byte(dev1, 0x52, &r);
 	if (r & 0x80)	/* IDEDIR disabled */
 		ret = 1;
 done:
 	printk(KERN_WARNING "UDMA not supported in this configuration.\n");
 done_nomsg:		/* Wrong chip revision */
 	pci_dev_put(dev1);
 	return ret;
 }

 static int optidma_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	static struct ata_port_info info_82c700 = {
 		.sht = &optidma_sht,
 		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 		.pio_mask = 0x1f,
 		.mwdma_mask = 0x07,
 		.port_ops = &optidma_port_ops
 	};
 	static struct ata_port_info info_82c700_udma = {
 		.sht = &optidma_sht,
 		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 		.pio_mask = 0x1f,
 		.mwdma_mask = 0x07,
 		.udma_mask = 0x07,
 		.port_ops = &optiplus_port_ops
 	};
 	static struct ata_port_info *port_info[2];
 	struct ata_port_info *info = &info_82c700;
 	static int printed_version;

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

 	/* Fixed location chipset magic */
 	inw(0x1F1);
 	inw(0x1F1);
 	pci_clock = inb(0x1F5) & 1;		/* 0 = 33Mhz, 1 = 25Mhz */

 	if (optiplus_with_udma(dev))
 		info = &info_82c700_udma;

 	port_info[0] = port_info[1] = info;
 	return ata_pci_init_one(dev, port_info, 2);
 }

 static const struct pci_device_id optidma[] = {
 	{ PCI_VDEVICE(OPTI, 0xD568), },		/* Opti 82C700 */

 	{ },
 };

 static struct pci_driver optidma_pci_driver = {
 	.name 		= DRV_NAME,
 	.id_table	= optidma,
 	.probe 		= optidma_init_one,
 	.remove		= ata_pci_remove_one,
 #ifdef CONFIG_PM
 	.suspend	= ata_pci_device_suspend,
 	.resume		= ata_pci_device_resume,
 #endif
 };

 static int __init optidma_init(void)
 {
 	return pci_register_driver(&optidma_pci_driver);
 }

 static void __exit optidma_exit(void)
 {
 	pci_unregister_driver(&optidma_pci_driver);
 }

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("low-level driver for Opti Firestar/Firestar Plus");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, optidma);
 MODULE_VERSION(DRV_VERSION);

 module_init(optidma_init);
 module_exit(optidma_exit);
	/*
	* pata_optidma.c - Opti DMA PATA for new ATA layer
	* (C) 2006 Red Hat Inc
	* Alan Cox <alan@redhat.com>
	*
	* The Opti DMA controllers are related to the older PIO PCI controllers
	* and indeed the VLB ones. The main differences are that the timing
	* numbers are now based off PCI clocks not VLB and differ, and that
	* MWDMA is supported.
	*
	* This driver should support Viper-N+, FireStar, FireStar Plus.
	*
	* These devices support virtual DMA for read (aka the CS5520). Later
	* chips support UDMA33, but only if the rest of the board logic does,
	* so you have to get this right. We don't support the virtual DMA
	* but we do handle UDMA.
	*
	* Bits that are worth knowing
	* Most control registers are shadowed into I/O registers
	* 0x1F5 bit 0 tells you if the PCI/VLB clock is 33 or 25Mhz
	* Virtual DMA registers move between rev 0x02 and rev 0x10
	* UDMA requires a 66MHz FSB
	*
	*/

	#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_optidma"
	#define DRV_VERSION "0.2.4"

	enum {
	READ_REG = 0, /* index of Read cycle timing register */
	WRITE_REG = 1, /* index of Write cycle timing register */
	CNTRL_REG = 3, /* index of Control register */
	STRAP_REG = 5, /* index of Strap register */
	MISC_REG = 6 /* index of Miscellaneous register */
	};

	static int pci_clock; /* 0 = 33 1 = 25 */

	/**
	* optidma_pre_reset - probe begin
	* @ap: ATA port
	*
	* Set up cable type and use generic probe init
	*/

	static int optidma_pre_reset(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	static const struct pci_bits optidma_enable_bits = {
	0x40, 1, 0x08, 0x00
	};

	if (ap->port_no && !pci_test_config_bits(pdev, &optidma_enable_bits))
	return -ENOENT;

	ap->cbl = ATA_CBL_PATA40;
	return ata_std_prereset(ap);
	}

	/**
	* optidma_probe_reset - probe reset
	* @ap: ATA port
	*
	* Perform the ATA probe and bus reset sequence plus specific handling
	* for this hardware. The Opti needs little handling - we have no UDMA66
	* capability that needs cable detection. All we must do is check the port
	* is enabled.
	*/

	static void optidma_error_handler(struct ata_port *ap)
	{
	ata_bmdma_drive_eh(ap, optidma_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
	}

	/**
	* optidma_unlock - unlock control registers
	* @ap: ATA port
	*
	* Unlock the control register block for this adapter. Registers must not
	* be unlocked in a situation where libata might look at them.
	*/

	static void optidma_unlock(struct ata_port *ap)
	{
	void __iomem *regio = ap->ioaddr.cmd_addr;

	/* These 3 unlock the control register access */
	ioread16(regio + 1);
	ioread16(regio + 1);
	iowrite8(3, regio + 2);
	}

	/**
	* optidma_lock - issue temporary relock
	* @ap: ATA port
	*
	* Re-lock the configuration register settings.
	*/

	static void optidma_lock(struct ata_port *ap)
	{
	void __iomem *regio = ap->ioaddr.cmd_addr;

	/* Relock */
	iowrite8(0x83, regio + 2);
	}

	/**
	* optidma_set_mode - set mode data
	* @ap: ATA interface
	* @adev: ATA device
	* @mode: Mode to set
	*
	* Called to do the DMA or PIO mode setup. Timing numbers are all
	* pre computed to keep the code clean. There are two tables depending
	* on the hardware clock speed.
	*
	* WARNING: While we do this the IDE registers vanish. If we take an
	* IRQ here we depend on the host set locking to avoid catastrophe.
	*/

	static void optidma_set_mode(struct ata_port ap, struct ata_device adev, u8 mode)
	{
	struct ata_device *pair = ata_dev_pair(adev);
	int pio = adev->pio_mode - XFER_PIO_0;
	int dma = adev->dma_mode - XFER_MW_DMA_0;
	void __iomem *regio = ap->ioaddr.cmd_addr;
	u8 addr;

	/* Address table precomputed with a DCLK of 2 */
	static const u8 addr_timing[2][5] = {
	{ 0x30, 0x20, 0x20, 0x10, 0x10 },
	{ 0x20, 0x20, 0x10, 0x10, 0x10 }
	};
	static const u8 data_rec_timing[2][5] = {
	{ 0x59, 0x46, 0x30, 0x20, 0x20 },
	{ 0x46, 0x32, 0x20, 0x20, 0x10 }
	};
	static const u8 dma_data_rec_timing[2][3] = {
	{ 0x76, 0x20, 0x20 },
	{ 0x54, 0x20, 0x10 }
	};

	/* Switch from IDE to control mode */
	optidma_unlock(ap);


	/*
	* As with many controllers the address setup time is shared
	* and must suit both devices if present. FIXME: Check if we
	* need to look at slowest of PIO/DMA mode of either device
	*/

	if (mode >= XFER_MW_DMA_0)
	addr = 0;
	else
	addr = addr_timing[pci_clock][pio];

	if (pair) {
	u8 pair_addr;
	/* Hardware constraint */
	if (pair->dma_mode)
	pair_addr = 0;
	else
	pair_addr = addr_timing[pci_clock][pair->pio_mode - XFER_PIO_0];
	if (pair_addr > addr)
	addr = pair_addr;
	}

	/* Commence primary programming sequence */
	/* First we load the device number into the timing select */
	iowrite8(adev->devno, regio + MISC_REG);
	/* Now we load the data timings into read data/write data */
	if (mode < XFER_MW_DMA_0) {
	iowrite8(data_rec_timing[pci_clock][pio], regio + READ_REG);
	iowrite8(data_rec_timing[pci_clock][pio], regio + WRITE_REG);
	} else if (mode < XFER_UDMA_0) {
	iowrite8(dma_data_rec_timing[pci_clock][dma], regio + READ_REG);
	iowrite8(dma_data_rec_timing[pci_clock][dma], regio + WRITE_REG);
	}
	/* Finally we load the address setup into the misc register */
	iowrite8(addr \| adev->devno, regio + MISC_REG);

	/* Programming sequence complete, timing 0 dev 0, timing 1 dev 1 */
	iowrite8(0x85, regio + CNTRL_REG);

	/* Switch back to IDE mode */
	optidma_lock(ap);

	/* Note: at this point our programming is incomplete. We are
	not supposed to program PCI 0x43 "things we hacked onto the chip"
	until we've done both sets of PIO/DMA timings */
	}

	/**
	* optiplus_set_mode - DMA setup for Firestar Plus
	* @ap: ATA port
	* @adev: device
	* @mode: desired mode
	*
	* The Firestar plus has additional UDMA functionality for UDMA0-2 and
	* requires we do some additional work. Because the base work we must do
	* is mostly shared we wrap the Firestar setup functionality in this
	* one
	*/

	static void optiplus_set_mode(struct ata_port ap, struct ata_device adev, u8 mode)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 udcfg;
	u8 udslave;
	int dev2 = 2 * adev->devno;
	int unit = 2 * ap->port_no + adev->devno;
	int udma = mode - XFER_UDMA_0;

	pci_read_config_byte(pdev, 0x44, &udcfg);
	if (mode <= XFER_UDMA_0) {
	udcfg &= ~(1 << unit);
	optidma_set_mode(ap, adev, adev->dma_mode);
	} else {
	udcfg \|= (1 << unit);
	if (ap->port_no) {
	pci_read_config_byte(pdev, 0x45, &udslave);
	udslave &= ~(0x03 << dev2);
	udslave \|= (udma << dev2);
	pci_write_config_byte(pdev, 0x45, udslave);
	} else {
	udcfg &= ~(0x30 << dev2);
	udcfg \|= (udma << dev2);
	}
	}
	pci_write_config_byte(pdev, 0x44, udcfg);
	}

	/**
	* optidma_set_pio_mode - PIO setup callback
	* @ap: ATA port
	* @adev: Device
	*
	* The libata core provides separate functions for handling PIO and
	* DMA programming. The architecture of the Firestar makes it easier
	* for us to have a common function so we provide wrappers
	*/

	static void optidma_set_pio_mode(struct ata_port ap, struct ata_device adev)
	{
	optidma_set_mode(ap, adev, adev->pio_mode);
	}

	/**
	* optidma_set_dma_mode - DMA setup callback
	* @ap: ATA port
	* @adev: Device
	*
	* The libata core provides separate functions for handling PIO and
	* DMA programming. The architecture of the Firestar makes it easier
	* for us to have a common function so we provide wrappers
	*/

	static void optidma_set_dma_mode(struct ata_port ap, struct ata_device adev)
	{
	optidma_set_mode(ap, adev, adev->dma_mode);
	}

	/**
	* optiplus_set_pio_mode - PIO setup callback
	* @ap: ATA port
	* @adev: Device
	*
	* The libata core provides separate functions for handling PIO and
	* DMA programming. The architecture of the Firestar makes it easier
	* for us to have a common function so we provide wrappers
	*/

	static void optiplus_set_pio_mode(struct ata_port ap, struct ata_device adev)
	{
	optiplus_set_mode(ap, adev, adev->pio_mode);
	}

	/**
	* optiplus_set_dma_mode - DMA setup callback
	* @ap: ATA port
	* @adev: Device
	*
	* The libata core provides separate functions for handling PIO and
	* DMA programming. The architecture of the Firestar makes it easier
	* for us to have a common function so we provide wrappers
	*/

	static void optiplus_set_dma_mode(struct ata_port ap, struct ata_device adev)
	{
	optiplus_set_mode(ap, adev, adev->dma_mode);
	}

	/**
	* optidma_make_bits - PCI setup helper
	* @adev: ATA device
	*
	* Turn the ATA device setup into PCI configuration bits
	* for register 0x43 and return the two bits needed.
	*/

	static u8 optidma_make_bits43(struct ata_device *adev)
	{
	static const u8 bits43[5] = {
	0, 0, 0, 1, 2
	};
	if (!ata_dev_enabled(adev))
	return 0;
	if (adev->dma_mode)
	return adev->dma_mode - XFER_MW_DMA_0;
	return bits43[adev->pio_mode - XFER_PIO_0];
	}

	/**
	* optidma_post_set_mode - finalize PCI setup
	* @ap: port to set up
	*
	* Finalise the configuration by writing the nibble of extra bits
	* of data into the chip.
	*/

	static void optidma_post_set_mode(struct ata_port *ap)
	{
	u8 r;
	int nybble = 4 * ap->port_no;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

	pci_read_config_byte(pdev, 0x43, &r);

	r &= (0x0F << nybble);
	r \|= (optidma_make_bits43(&ap->device[0]) +
	(optidma_make_bits43(&ap->device[0]) << 2)) << nybble;

	pci_write_config_byte(pdev, 0x43, r);
	}

	static struct scsi_host_template optidma_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,
	#ifdef CONFIG_PM
	.resume = ata_scsi_device_resume,
	.suspend = ata_scsi_device_suspend,
	#endif
	};

	static struct ata_port_operations optidma_port_ops = {
	.port_disable = ata_port_disable,
	.set_piomode = optidma_set_pio_mode,
	.set_dmamode = optidma_set_dma_mode,

	.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,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.error_handler = optidma_error_handler,
	.post_set_mode = optidma_post_set_mode,

	.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_data_xfer,

	.irq_handler = ata_interrupt,
	.irq_clear = ata_bmdma_irq_clear,
	.irq_on = ata_irq_on,
	.irq_ack = ata_irq_ack,

	.port_start = ata_port_start,
	};

	static struct ata_port_operations optiplus_port_ops = {
	.port_disable = ata_port_disable,
	.set_piomode = optiplus_set_pio_mode,
	.set_dmamode = optiplus_set_dma_mode,

	.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,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.error_handler = optidma_error_handler,
	.post_set_mode = optidma_post_set_mode,

	.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_data_xfer,

	.irq_handler = ata_interrupt,
	.irq_clear = ata_bmdma_irq_clear,
	.irq_on = ata_irq_on,
	.irq_ack = ata_irq_ack,

	.port_start = ata_port_start,
	};

	/**
	* optiplus_with_udma - Look for UDMA capable setup
	* @pdev; ATA controller
	*/

	static int optiplus_with_udma(struct pci_dev *pdev)
	{
	u8 r;
	int ret = 0;
	int ioport = 0x22;
	struct pci_dev *dev1;

	/* Find function 1 */
	dev1 = pci_get_device(0x1045, 0xC701, NULL);
	if(dev1 == NULL)
	return 0;

	/* Rev must be >= 0x10 */
	pci_read_config_byte(dev1, 0x08, &r);
	if (r < 0x10)
	goto done_nomsg;
	/* Read the chipset system configuration to check our mode */
	pci_read_config_byte(dev1, 0x5F, &r);
	ioport \|= (r << 8);
	outb(0x10, ioport);
	/* Must be 66Mhz sync */
	if ((inb(ioport + 2) & 1) == 0)
	goto done;

	/* Check the ATA arbitration/timing is suitable */
	pci_read_config_byte(pdev, 0x42, &r);
	if ((r & 0x36) != 0x36)
	goto done;
	pci_read_config_byte(dev1, 0x52, &r);
	if (r & 0x80) /* IDEDIR disabled */
	ret = 1;
	done:
	printk(KERN_WARNING "UDMA not supported in this configuration.\n");
	done_nomsg: /* Wrong chip revision */
	pci_dev_put(dev1);
	return ret;
	}

	static int optidma_init_one(struct pci_dev dev, const struct pci_device_id id)
	{
	static struct ata_port_info info_82c700 = {
	.sht = &optidma_sht,
	.flags = ATA_FLAG_SLAVE_POSS \| ATA_FLAG_SRST,
	.pio_mask = 0x1f,
	.mwdma_mask = 0x07,
	.port_ops = &optidma_port_ops
	};
	static struct ata_port_info info_82c700_udma = {
	.sht = &optidma_sht,
	.flags = ATA_FLAG_SLAVE_POSS \| ATA_FLAG_SRST,
	.pio_mask = 0x1f,
	.mwdma_mask = 0x07,
	.udma_mask = 0x07,
	.port_ops = &optiplus_port_ops
	};
	static struct ata_port_info *port_info[2];
	struct ata_port_info *info = &info_82c700;
	static int printed_version;

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

	/* Fixed location chipset magic */
	inw(0x1F1);
	inw(0x1F1);
	pci_clock = inb(0x1F5) & 1; /* 0 = 33Mhz, 1 = 25Mhz */

	if (optiplus_with_udma(dev))
	info = &info_82c700_udma;

	port_info[0] = port_info[1] = info;
	return ata_pci_init_one(dev, port_info, 2);
	}

	static const struct pci_device_id optidma[] = {
	{ PCI_VDEVICE(OPTI, 0xD568), }, /* Opti 82C700 */

	{ },
	};

	static struct pci_driver optidma_pci_driver = {
	.name = DRV_NAME,
	.id_table = optidma,
	.probe = optidma_init_one,
	.remove = ata_pci_remove_one,
	#ifdef CONFIG_PM
	.suspend = ata_pci_device_suspend,
	.resume = ata_pci_device_resume,
	#endif
	};

	static int __init optidma_init(void)
	{
	return pci_register_driver(&optidma_pci_driver);
	}

	static void __exit optidma_exit(void)
	{
	pci_unregister_driver(&optidma_pci_driver);
	}

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("low-level driver for Opti Firestar/Firestar Plus");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, optidma);
	MODULE_VERSION(DRV_VERSION);

	module_init(optidma_init);
	module_exit(optidma_exit);