drivers/ata/pata_cs5530.c - kernel/msm-4.9 - Gitiles

 /*
  * pata-cs5530.c 	- CS5530 PATA for new ATA layer
  *			  (C) 2005 Red Hat Inc
  *			  Alan Cox <alan@redhat.com>
  *
  * based upon cs5530.c by Mark Lord.
  *
  * 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
  *
  * Loosely based on the piix & svwks drivers.
  *
  * Documentation:
  *	Available from AMD web site.
  */

 #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>
 #include <linux/dmi.h>

 #define DRV_NAME	"pata_cs5530"
 #define DRV_VERSION	"0.7.3"

 static void __iomem *cs5530_port_base(struct ata_port *ap)
 {
 	unsigned long bmdma = (unsigned long)ap->ioaddr.bmdma_addr;

 	return (void __iomem *)((bmdma & ~0x0F) + 0x20 + 0x10 * ap->port_no);
 }

 /**
  *	cs5530_set_piomode		-	PIO setup
  *	@ap: ATA interface
  *	@adev: device on the interface
  *
  *	Set our PIO requirements. This is fairly simple on the CS5530
  *	chips.
  */

 static void cs5530_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	static const unsigned int cs5530_pio_timings[2][5] = {
 		{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
 		{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
 	};
 	void __iomem *base = cs5530_port_base(ap);
 	u32 tuning;
 	int format;

 	/* Find out which table to use */
 	tuning = ioread32(base + 0x04);
 	format = (tuning & 0x80000000UL) ? 1 : 0;

 	/* Now load the right timing register */
 	if (adev->devno)
 		base += 0x08;

 	iowrite32(cs5530_pio_timings[format][adev->pio_mode - XFER_PIO_0], base);
 }

 /**
  *	cs5530_set_dmamode		-	DMA timing setup
  *	@ap: ATA interface
  *	@adev: Device being configured
  *
  *	We cannot mix MWDMA and UDMA without reloading timings each switch
  *	master to slave. We track the last DMA setup in order to minimise
  *	reloads.
  */

 static void cs5530_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 {
 	void __iomem *base = cs5530_port_base(ap);
 	u32 tuning, timing = 0;
 	u8 reg;

 	/* Find out which table to use */
 	tuning = ioread32(base + 0x04);

 	switch(adev->dma_mode) {
 		case XFER_UDMA_0:
 			timing  = 0x00921250;break;
 		case XFER_UDMA_1:
 			timing  = 0x00911140;break;
 		case XFER_UDMA_2:
 			timing  = 0x00911030;break;
 		case XFER_MW_DMA_0:
 			timing  = 0x00077771;break;
 		case XFER_MW_DMA_1:
 			timing  = 0x00012121;break;
 		case XFER_MW_DMA_2:
 			timing  = 0x00002020;break;
 		default:
 			BUG();
 	}
 	/* Merge in the PIO format bit */
 	timing |= (tuning & 0x80000000UL);
 	if (adev->devno == 0) /* Master */
 		iowrite32(timing, base + 0x04);
 	else {
 		if (timing & 0x00100000)
 			tuning |= 0x00100000;	/* UDMA for both */
 		else
 			tuning &= ~0x00100000;	/* MWDMA for both */
 		iowrite32(tuning, base + 0x04);
 		iowrite32(timing, base + 0x0C);
 	}

 	/* Set the DMA capable bit in the BMDMA area */
 	reg = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
 	reg |= (1 << (5 + adev->devno));
 	iowrite8(reg, ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

 	/* Remember the last DMA setup we did */

 	ap->private_data = adev;
 }

 /**
  *	cs5530_qc_issue_prot	-	command issue
  *	@qc: command pending
  *
  *	Called when the libata layer is about to issue a command. We wrap
  *	this interface so that we can load the correct ATA timings if
  *	neccessary.  Specifically we have a problem that there is only
  *	one MWDMA/UDMA bit.
  */

 static unsigned int cs5530_qc_issue_prot(struct ata_queued_cmd *qc)
 {
 	struct ata_port *ap = qc->ap;
 	struct ata_device *adev = qc->dev;
 	struct ata_device *prev = ap->private_data;

 	/* See if the DMA settings could be wrong */
 	if (adev->dma_mode != 0 && adev != prev && prev != NULL) {
 		/* Maybe, but do the channels match MWDMA/UDMA ? */
 		if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) ||
 		    (adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0))
 		    	/* Switch the mode bits */
 		    	cs5530_set_dmamode(ap, adev);
 	}

 	return ata_qc_issue_prot(qc);
 }

 static struct scsi_host_template cs5530_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_DUMB_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 cs5530_port_ops = {
 	.port_disable	= ata_port_disable,
 	.set_piomode	= cs5530_set_piomode,
 	.set_dmamode	= cs5530_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,

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

 	.freeze		= ata_bmdma_freeze,
 	.thaw		= ata_bmdma_thaw,
 	.error_handler	= ata_bmdma_error_handler,
 	.post_internal_cmd = ata_bmdma_post_internal_cmd,
 	.cable_detect	= ata_cable_40wire,

 	.qc_prep 	= ata_dumb_qc_prep,
 	.qc_issue	= cs5530_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 dmi_system_id palmax_dmi_table[] = {
 	{
 		.ident = "Palmax PD1100",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Cyrix"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "Caddis"),
 		},
 	},
 	{ }
 };

 static int cs5530_is_palmax(void)
 {
 	if (dmi_check_system(palmax_dmi_table)) {
 		printk(KERN_INFO "Palmax PD1100: Disabling DMA on docking port.\n");
 		return 1;
 	}
 	return 0;
 }


 /**
  *	cs5530_init_chip	-	Chipset init
  *
  *	Perform the chip initialisation work that is shared between both
  *	setup and resume paths
  */

 static int cs5530_init_chip(void)
 {
 	struct pci_dev *master_0 = NULL, *cs5530_0 = NULL, *dev = NULL;

 	while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
 		switch (dev->device) {
 			case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
 				master_0 = pci_dev_get(dev);
 				break;
 			case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
 				cs5530_0 = pci_dev_get(dev);
 				break;
 		}
 	}
 	if (!master_0) {
 		printk(KERN_ERR DRV_NAME ": unable to locate PCI MASTER function\n");
 		goto fail_put;
 	}
 	if (!cs5530_0) {
 		printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n");
 		goto fail_put;
 	}

 	pci_set_master(cs5530_0);
 	pci_try_set_mwi(cs5530_0);

 	/*
 	 * Set PCI CacheLineSize to 16-bytes:
 	 * --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
 	 *
 	 * Note: This value is constant because the 5530 is only a Geode companion
 	 */

 	pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);

 	/*
 	 * Disable trapping of UDMA register accesses (Win98 hack):
 	 * --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
 	 */

 	pci_write_config_word(cs5530_0, 0xd0, 0x5006);

 	/*
 	 * Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
 	 * The other settings are what is necessary to get the register
 	 * into a sane state for IDE DMA operation.
 	 */

 	pci_write_config_byte(master_0, 0x40, 0x1e);

 	/*
 	 * Set max PCI burst size (16-bytes seems to work best):
 	 *	   16bytes: set bit-1 at 0x41 (reg value of 0x16)
 	 *	all others: clear bit-1 at 0x41, and do:
 	 *	  128bytes: OR 0x00 at 0x41
 	 *	  256bytes: OR 0x04 at 0x41
 	 *	  512bytes: OR 0x08 at 0x41
 	 *	 1024bytes: OR 0x0c at 0x41
 	 */

 	pci_write_config_byte(master_0, 0x41, 0x14);

 	/*
 	 * These settings are necessary to get the chip
 	 * into a sane state for IDE DMA operation.
 	 */

 	pci_write_config_byte(master_0, 0x42, 0x00);
 	pci_write_config_byte(master_0, 0x43, 0xc1);

 	pci_dev_put(master_0);
 	pci_dev_put(cs5530_0);
 	return 0;
 fail_put:
 	if (master_0)
 		pci_dev_put(master_0);
 	if (cs5530_0)
 		pci_dev_put(cs5530_0);
 	return -ENODEV;
 }

 /**
  *	cs5530_init_one		-	Initialise a CS5530
  *	@dev: PCI device
  *	@id: Entry in match table
  *
  *	Install a driver for the newly found CS5530 companion chip. Most of
  *	this is just housekeeping. We have to set the chip up correctly and
  *	turn off various bits of emulation magic.
  */

 static int cs5530_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	static const struct ata_port_info info = {
 		.sht = &cs5530_sht,
 		.flags = ATA_FLAG_SLAVE_POSS,
 		.pio_mask = 0x1f,
 		.mwdma_mask = 0x07,
 		.udma_mask = 0x07,
 		.port_ops = &cs5530_port_ops
 	};
 	/* The docking connector doesn't do UDMA, and it seems not MWDMA */
 	static const struct ata_port_info info_palmax_secondary = {
 		.sht = &cs5530_sht,
 		.flags = ATA_FLAG_SLAVE_POSS,
 		.pio_mask = 0x1f,
 		.port_ops = &cs5530_port_ops
 	};
 	const struct ata_port_info *ppi[] = { &info, NULL };

 	/* Chip initialisation */
 	if (cs5530_init_chip())
 		return -ENODEV;

 	if (cs5530_is_palmax())
 		ppi[1] = &info_palmax_secondary;

 	/* Now kick off ATA set up */
 	return ata_pci_init_one(pdev, ppi);
 }

 #ifdef CONFIG_PM
 static int cs5530_reinit_one(struct pci_dev *pdev)
 {
 	/* If we fail on resume we are doomed */
 	if (cs5530_init_chip())
 		BUG();
 	return ata_pci_device_resume(pdev);
 }
 #endif /* CONFIG_PM */

 static const struct pci_device_id cs5530[] = {
 	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), },

 	{ },
 };

 static struct pci_driver cs5530_pci_driver = {
 	.name 		= DRV_NAME,
 	.id_table	= cs5530,
 	.probe 		= cs5530_init_one,
 	.remove		= ata_pci_remove_one,
 #ifdef CONFIG_PM
 	.suspend	= ata_pci_device_suspend,
 	.resume		= cs5530_reinit_one,
 #endif
 };

 static int __init cs5530_init(void)
 {
 	return pci_register_driver(&cs5530_pci_driver);
 }

 static void __exit cs5530_exit(void)
 {
 	pci_unregister_driver(&cs5530_pci_driver);
 }

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("low-level driver for the Cyrix/NS/AMD 5530");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, cs5530);
 MODULE_VERSION(DRV_VERSION);

 module_init(cs5530_init);
 module_exit(cs5530_exit);
	/*
	* pata-cs5530.c - CS5530 PATA for new ATA layer
	* (C) 2005 Red Hat Inc
	* Alan Cox <alan@redhat.com>
	*
	* based upon cs5530.c by Mark Lord.
	*
	* 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
	*
	* Loosely based on the piix & svwks drivers.
	*
	* Documentation:
	* Available from AMD web site.
	*/

	#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>
	#include <linux/dmi.h>

	#define DRV_NAME "pata_cs5530"
	#define DRV_VERSION "0.7.3"

	static void __iomem cs5530_port_base(struct ata_port ap)
	{
	unsigned long bmdma = (unsigned long)ap->ioaddr.bmdma_addr;

	return (void __iomem )((bmdma & ~0x0F) + 0x20 + 0x10 ap->port_no);
	}

	/**
	* cs5530_set_piomode - PIO setup
	* @ap: ATA interface
	* @adev: device on the interface
	*
	* Set our PIO requirements. This is fairly simple on the CS5530
	* chips.
	*/

	static void cs5530_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	static const unsigned int cs5530_pio_timings[2][5] = {
	{0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
	{0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
	};
	void __iomem *base = cs5530_port_base(ap);
	u32 tuning;
	int format;

	/* Find out which table to use */
	tuning = ioread32(base + 0x04);
	format = (tuning & 0x80000000UL) ? 1 : 0;

	/* Now load the right timing register */
	if (adev->devno)
	base += 0x08;

	iowrite32(cs5530_pio_timings[format][adev->pio_mode - XFER_PIO_0], base);
	}

	/**
	* cs5530_set_dmamode - DMA timing setup
	* @ap: ATA interface
	* @adev: Device being configured
	*
	* We cannot mix MWDMA and UDMA without reloading timings each switch
	* master to slave. We track the last DMA setup in order to minimise
	* reloads.
	*/

	static void cs5530_set_dmamode(struct ata_port ap, struct ata_device adev)
	{
	void __iomem *base = cs5530_port_base(ap);
	u32 tuning, timing = 0;
	u8 reg;

	/* Find out which table to use */
	tuning = ioread32(base + 0x04);

	switch(adev->dma_mode) {
	case XFER_UDMA_0:
	timing = 0x00921250;break;
	case XFER_UDMA_1:
	timing = 0x00911140;break;
	case XFER_UDMA_2:
	timing = 0x00911030;break;
	case XFER_MW_DMA_0:
	timing = 0x00077771;break;
	case XFER_MW_DMA_1:
	timing = 0x00012121;break;
	case XFER_MW_DMA_2:
	timing = 0x00002020;break;
	default:
	BUG();
	}
	/* Merge in the PIO format bit */
	timing \|= (tuning & 0x80000000UL);
	if (adev->devno == 0) /* Master */
	iowrite32(timing, base + 0x04);
	else {
	if (timing & 0x00100000)
	tuning \|= 0x00100000; /* UDMA for both */
	else
	tuning &= ~0x00100000; /* MWDMA for both */
	iowrite32(tuning, base + 0x04);
	iowrite32(timing, base + 0x0C);
	}

	/* Set the DMA capable bit in the BMDMA area */
	reg = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
	reg \|= (1 << (5 + adev->devno));
	iowrite8(reg, ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);

	/* Remember the last DMA setup we did */

	ap->private_data = adev;
	}

	/**
	* cs5530_qc_issue_prot - command issue
	* @qc: command pending
	*
	* Called when the libata layer is about to issue a command. We wrap
	* this interface so that we can load the correct ATA timings if
	* neccessary. Specifically we have a problem that there is only
	* one MWDMA/UDMA bit.
	*/

	static unsigned int cs5530_qc_issue_prot(struct ata_queued_cmd *qc)
	{
	struct ata_port *ap = qc->ap;
	struct ata_device *adev = qc->dev;
	struct ata_device *prev = ap->private_data;

	/* See if the DMA settings could be wrong */
	if (adev->dma_mode != 0 && adev != prev && prev != NULL) {
	/* Maybe, but do the channels match MWDMA/UDMA ? */
	if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) \|\|
	(adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0))
	/* Switch the mode bits */
	cs5530_set_dmamode(ap, adev);
	}

	return ata_qc_issue_prot(qc);
	}

	static struct scsi_host_template cs5530_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_DUMB_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 cs5530_port_ops = {
	.port_disable = ata_port_disable,
	.set_piomode = cs5530_set_piomode,
	.set_dmamode = cs5530_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,

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

	.freeze = ata_bmdma_freeze,
	.thaw = ata_bmdma_thaw,
	.error_handler = ata_bmdma_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.cable_detect = ata_cable_40wire,

	.qc_prep = ata_dumb_qc_prep,
	.qc_issue = cs5530_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 dmi_system_id palmax_dmi_table[] = {
	{
	.ident = "Palmax PD1100",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Cyrix"),
	DMI_MATCH(DMI_PRODUCT_NAME, "Caddis"),
	},
	},
	{ }
	};

	static int cs5530_is_palmax(void)
	{
	if (dmi_check_system(palmax_dmi_table)) {
	printk(KERN_INFO "Palmax PD1100: Disabling DMA on docking port.\n");
	return 1;
	}
	return 0;
	}


	/**
	* cs5530_init_chip - Chipset init
	*
	* Perform the chip initialisation work that is shared between both
	* setup and resume paths
	*/

	static int cs5530_init_chip(void)
	{
	struct pci_dev master_0 = NULL, cs5530_0 = NULL, *dev = NULL;

	while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
	switch (dev->device) {
	case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
	master_0 = pci_dev_get(dev);
	break;
	case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
	cs5530_0 = pci_dev_get(dev);
	break;
	}
	}
	if (!master_0) {
	printk(KERN_ERR DRV_NAME ": unable to locate PCI MASTER function\n");
	goto fail_put;
	}
	if (!cs5530_0) {
	printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n");
	goto fail_put;
	}

	pci_set_master(cs5530_0);
	pci_try_set_mwi(cs5530_0);

	/*
	* Set PCI CacheLineSize to 16-bytes:
	* --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
	*
	* Note: This value is constant because the 5530 is only a Geode companion
	*/

	pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);

	/*
	* Disable trapping of UDMA register accesses (Win98 hack):
	* --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
	*/

	pci_write_config_word(cs5530_0, 0xd0, 0x5006);

	/*
	* Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
	* The other settings are what is necessary to get the register
	* into a sane state for IDE DMA operation.
	*/

	pci_write_config_byte(master_0, 0x40, 0x1e);

	/*
	* Set max PCI burst size (16-bytes seems to work best):
	* 16bytes: set bit-1 at 0x41 (reg value of 0x16)
	* all others: clear bit-1 at 0x41, and do:
	* 128bytes: OR 0x00 at 0x41
	* 256bytes: OR 0x04 at 0x41
	* 512bytes: OR 0x08 at 0x41
	* 1024bytes: OR 0x0c at 0x41
	*/

	pci_write_config_byte(master_0, 0x41, 0x14);

	/*
	* These settings are necessary to get the chip
	* into a sane state for IDE DMA operation.
	*/

	pci_write_config_byte(master_0, 0x42, 0x00);
	pci_write_config_byte(master_0, 0x43, 0xc1);

	pci_dev_put(master_0);
	pci_dev_put(cs5530_0);
	return 0;
	fail_put:
	if (master_0)
	pci_dev_put(master_0);
	if (cs5530_0)
	pci_dev_put(cs5530_0);
	return -ENODEV;
	}

	/**
	* cs5530_init_one - Initialise a CS5530
	* @dev: PCI device
	* @id: Entry in match table
	*
	* Install a driver for the newly found CS5530 companion chip. Most of
	* this is just housekeeping. We have to set the chip up correctly and
	* turn off various bits of emulation magic.
	*/

	static int cs5530_init_one(struct pci_dev pdev, const struct pci_device_id id)
	{
	static const struct ata_port_info info = {
	.sht = &cs5530_sht,
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = 0x1f,
	.mwdma_mask = 0x07,
	.udma_mask = 0x07,
	.port_ops = &cs5530_port_ops
	};
	/* The docking connector doesn't do UDMA, and it seems not MWDMA */
	static const struct ata_port_info info_palmax_secondary = {
	.sht = &cs5530_sht,
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = 0x1f,
	.port_ops = &cs5530_port_ops
	};
	const struct ata_port_info *ppi[] = { &info, NULL };

	/* Chip initialisation */
	if (cs5530_init_chip())
	return -ENODEV;

	if (cs5530_is_palmax())
	ppi[1] = &info_palmax_secondary;

	/* Now kick off ATA set up */
	return ata_pci_init_one(pdev, ppi);
	}

	#ifdef CONFIG_PM
	static int cs5530_reinit_one(struct pci_dev *pdev)
	{
	/* If we fail on resume we are doomed */
	if (cs5530_init_chip())
	BUG();
	return ata_pci_device_resume(pdev);
	}
	#endif /* CONFIG_PM */

	static const struct pci_device_id cs5530[] = {
	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), },

	{ },
	};

	static struct pci_driver cs5530_pci_driver = {
	.name = DRV_NAME,
	.id_table = cs5530,
	.probe = cs5530_init_one,
	.remove = ata_pci_remove_one,
	#ifdef CONFIG_PM
	.suspend = ata_pci_device_suspend,
	.resume = cs5530_reinit_one,
	#endif
	};

	static int __init cs5530_init(void)
	{
	return pci_register_driver(&cs5530_pci_driver);
	}

	static void __exit cs5530_exit(void)
	{
	pci_unregister_driver(&cs5530_pci_driver);
	}

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("low-level driver for the Cyrix/NS/AMD 5530");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, cs5530);
	MODULE_VERSION(DRV_VERSION);

	module_init(cs5530_init);
	module_exit(cs5530_exit);