drivers/ata/pata_ns87415.c - kernel/msm - Gitiles

 /*
  *    pata_ns87415.c - NS87415 (non PARISC) PATA
  *
  *	(C) 2005 Red Hat <alan@redhat.com>
  *
  *    This is a fairly generic MWDMA controller. It has some limitations
  *    as it requires timing reloads on PIO/DMA transitions but it is otherwise
  *    fairly well designed.
  *
  *    This driver assumes the firmware has left the chip in a valid ST506
  *    compliant state, either legacy IRQ 14/15 or native INTA shared. You
  *    may need to add platform code if your system fails to do this.
  *
  *    The same cell appears in the 87560 controller used by some PARISC
  *    systems. This has its own special mountain of errata.
  *
  *    TODO:
  *	Test PARISC SuperIO
  *	Get someone to test on SPARC
  *	Implement lazy pio/dma switching for better performance
  *	8bit shared timing.
  *	See if we need to kill the FIFO for ATAPI
  */

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

 #define DRV_NAME	"pata_ns87415"
 #define DRV_VERSION	"0.0.1"

 /**
  *	ns87415_set_mode - Initialize host controller mode timings
  *	@ap: Port whose timings we are configuring
  *	@adev: Device whose timings we are configuring
  *	@mode: Mode to set
  *
  *	Program the mode registers for this controller, channel and
  *	device. Because the chip is quite an old design we have to do this
  *	for PIO/DMA switches.
  *
  *	LOCKING:
  *	None (inherited from caller).
  */

 static void ns87415_set_mode(struct ata_port *ap, struct ata_device *adev, u8 mode)
 {
 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
 	int unit		= 2 * ap->port_no + adev->devno;
 	int timing		= 0x44 + 2 * unit;
 	unsigned long T		= 1000000000 / 33333;	/* PCI clocks */
 	struct ata_timing t;
 	u16 clocking;
 	u8 iordy;
 	u8 status;

 	/* Timing register format is 17 - low nybble read timing with
 	   the high nybble being 16 - x for recovery time in PCI clocks */

 	ata_timing_compute(adev, adev->pio_mode, &t, T, 0);

 	clocking = 17 - FIT(t.active, 2, 17);
 	clocking |= (16 - FIT(t.recover, 1, 16)) << 4;
  	/* Use the same timing for read and write bytes */
 	clocking |= (clocking << 8);
 	pci_write_config_word(dev, timing, clocking);

 	/* Set the IORDY enable versus DMA enable on or off properly */
 	pci_read_config_byte(dev, 0x42, &iordy);
 	iordy &= ~(1 << (4 + unit));
 	if (mode >= XFER_MW_DMA_0 || !ata_pio_need_iordy(adev))
 		iordy |= (1 << (4 + unit));

 	/* Paranoia: We shouldn't ever get here with busy write buffers
 	   but if so wait */

 	pci_read_config_byte(dev, 0x43, &status);
 	while (status & 0x03) {
 		udelay(1);
 		pci_read_config_byte(dev, 0x43, &status);
 	}
 	/* Flip the IORDY/DMA bits now we are sure the write buffers are
 	   clear */
 	pci_write_config_byte(dev, 0x42, iordy);

 	/* TODO: Set byte 54 command timing to the best 8bit
 	   mode shared by all four devices */
 }

 /**
  *	ns87415_set_piomode - Initialize host controller PATA PIO timings
  *	@ap: Port whose timings we are configuring
  *	@adev: Device to program
  *
  *	Set PIO mode for device, in host controller PCI config space.
  *
  *	LOCKING:
  *	None (inherited from caller).
  */

 static void ns87415_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	ns87415_set_mode(ap, adev, adev->pio_mode);
 }

 /**
  *	ns87415_bmdma_setup		-	Set up DMA
  *	@qc: Command block
  *
  *	Set up for bus masterng DMA. We have to do this ourselves
  *	rather than use the helper due to a chip erratum
  */

 static void ns87415_bmdma_setup(struct ata_queued_cmd *qc)
 {
 	struct ata_port *ap = qc->ap;
 	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
 	u8 dmactl;

 	/* load PRD table addr. */
 	mb();	/* make sure PRD table writes are visible to controller */
 	iowrite32(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);

 	/* specify data direction, triple-check start bit is clear */
 	dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
 	dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
 	/* Due to an erratum we need to write these bits to the wrong
 	   place - which does save us an I/O bizarrely */
 	dmactl |= ATA_DMA_INTR | ATA_DMA_ERR;
 	if (!rw)
 		dmactl |= ATA_DMA_WR;
 	iowrite8(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
 	/* issue r/w command */
 	ap->ops->exec_command(ap, &qc->tf);
 }

 /**
  *	ns87415_bmdma_start		-	Begin DMA transfer
  *	@qc: Command block
  *
  *	Switch the timings for the chip and set up for a DMA transfer
  *	before the DMA burst begins.
  *
  *	FIXME: We should do lazy switching on bmdma_start versus
  *	ata_pio_data_xfer for better performance.
  */

 static void ns87415_bmdma_start(struct ata_queued_cmd *qc)
 {
 	ns87415_set_mode(qc->ap, qc->dev, qc->dev->dma_mode);
 	ata_bmdma_start(qc);
 }

 /**
  *	ns87415_bmdma_stop		-	End DMA transfer
  *	@qc: Command block
  *
  *	End DMA mode and switch the controller back into PIO mode
  */

 static void ns87415_bmdma_stop(struct ata_queued_cmd *qc)
 {
 	ata_bmdma_stop(qc);
 	ns87415_set_mode(qc->ap, qc->dev, qc->dev->pio_mode);
 }

 /**
  *	ns87415_bmdma_irq_clear		-	Clear interrupt
  *	@ap: Channel to clear
  *
  *	Erratum: Due to a chip bug regisers 02 and 0A bit 1 and 2 (the
  *	error bits) are reset by writing to register 00 or 08.
  */

 static void ns87415_bmdma_irq_clear(struct ata_port *ap)
 {
 	void __iomem *mmio = ap->ioaddr.bmdma_addr;

 	if (!mmio)
 		return;
 	iowrite8((ioread8(mmio + ATA_DMA_CMD) | ATA_DMA_INTR | ATA_DMA_ERR),
 			mmio + ATA_DMA_CMD);
 }

 /**
  *	ns87415_check_atapi_dma		-	ATAPI DMA filter
  *	@qc: Command block
  *
  *	Disable ATAPI DMA (for now). We may be able to do DMA if we
  *	kill the prefetching. This isn't clear.
  */

 static int ns87415_check_atapi_dma(struct ata_queued_cmd *qc)
 {
 	return -EOPNOTSUPP;
 }

 #if defined(CONFIG_SUPERIO)

 /* SUPERIO 87560 is a PoS chip that NatSem denies exists.
  * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
  * which use the integrated NS87514 cell for CD-ROM support.
  * i.e we have to support for CD-ROM installs.
  * See drivers/parisc/superio.c for more gory details.
  *
  * Workarounds taken from drivers/ide/pci/ns87415.c
  */

 #include <asm/superio.h>

 #define SUPERIO_IDE_MAX_RETRIES 25

 /**
  *	ns87560_read_buggy	-	workaround buggy Super I/O chip
  *	@port: Port to read
  *
  *	Work around chipset problems in the 87560 SuperIO chip
  */

 static u8 ns87560_read_buggy(void __iomem *port)
 {
 	u8 tmp;
 	int retries = SUPERIO_IDE_MAX_RETRIES;
 	do {
 		tmp = ioread8(port);
 		if (tmp != 0)
 			return tmp;
 		udelay(50);
 	} while(retries-- > 0);
 	return tmp;
 }

 /**
  *	ns87560_check_status
  *	@ap: channel to check
  *
  *	Return the status of the channel working around the
  *	87560 flaws.
  */

 static u8 ns87560_check_status(struct ata_port *ap)
 {
 	return ns87560_read_buggy(ap->ioaddr.status_addr);
 }

 /**
  *	ns87560_tf_read - input device's ATA taskfile shadow registers
  *	@ap: Port from which input is read
  *	@tf: ATA taskfile register set for storing input
  *
  *	Reads ATA taskfile registers for currently-selected device
  *	into @tf. Work around the 87560 bugs.
  *
  *	LOCKING:
  *	Inherited from caller.
  */
 void ns87560_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
 {
 	struct ata_ioports *ioaddr = &ap->ioaddr;

 	tf->command = ns87560_check_status(ap);
 	tf->feature = ioread8(ioaddr->error_addr);
 	tf->nsect = ioread8(ioaddr->nsect_addr);
 	tf->lbal = ioread8(ioaddr->lbal_addr);
 	tf->lbam = ioread8(ioaddr->lbam_addr);
 	tf->lbah = ioread8(ioaddr->lbah_addr);
 	tf->device = ns87560_read_buggy(ioaddr->device_addr);

 	if (tf->flags & ATA_TFLAG_LBA48) {
 		iowrite8(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
 		tf->hob_feature = ioread8(ioaddr->error_addr);
 		tf->hob_nsect = ioread8(ioaddr->nsect_addr);
 		tf->hob_lbal = ioread8(ioaddr->lbal_addr);
 		tf->hob_lbam = ioread8(ioaddr->lbam_addr);
 		tf->hob_lbah = ioread8(ioaddr->lbah_addr);
 		iowrite8(tf->ctl, ioaddr->ctl_addr);
 		ap->last_ctl = tf->ctl;
 	}
 }

 /**
  *	ns87560_bmdma_status
  *	@ap: channel to check
  *
  *	Return the DMA status of the channel working around the
  *	87560 flaws.
  */

 static u8 ns87560_bmdma_status(struct ata_port *ap)
 {
 	return ns87560_read_buggy(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
 }
 #endif		/* 87560 SuperIO Support */

 static struct ata_port_operations ns87415_pata_ops = {
 	.inherits		= &ata_bmdma_port_ops,

 	.check_atapi_dma	= ns87415_check_atapi_dma,
 	.bmdma_setup		= ns87415_bmdma_setup,
 	.bmdma_start		= ns87415_bmdma_start,
 	.bmdma_stop		= ns87415_bmdma_stop,
 	.irq_clear		= ns87415_bmdma_irq_clear,

 	.cable_detect		= ata_cable_40wire,
 	.set_piomode		= ns87415_set_piomode,
 };

 #if defined(CONFIG_SUPERIO)
 static struct ata_port_operations ns87560_pata_ops = {
 	.inherits		= &ns87415_pata_ops,
 	.tf_read		= ns87560_tf_read,
 	.check_status		= ns87560_check_status,
 	.bmdma_status		= ns87560_bmdma_status,
 };
 #endif

 static struct scsi_host_template ns87415_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 };


 /**
  *	ns87415_init_one - Register 87415 ATA PCI device with kernel services
  *	@pdev: PCI device to register
  *	@ent: Entry in ns87415_pci_tbl matching with @pdev
  *
  *	Called from kernel PCI layer.  We probe for combined mode (sigh),
  *	and then hand over control to libata, for it to do the rest.
  *
  *	LOCKING:
  *	Inherited from PCI layer (may sleep).
  *
  *	RETURNS:
  *	Zero on success, or -ERRNO value.
  */

 static int ns87415_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	static int printed_version;
 	static const struct ata_port_info info = {
 		.flags		= ATA_FLAG_SLAVE_POSS,
 		.pio_mask	= 0x1f,	/* pio0-4 */
 		.mwdma_mask	= 0x07, /* mwdma0-2 */
 		.port_ops	= &ns87415_pata_ops,
 	};
 	const struct ata_port_info *ppi[] = { &info, NULL };
 	int rc;
 #if defined(CONFIG_SUPERIO)
 	static const struct ata_port_info info87560 = {
 		.flags		= ATA_FLAG_SLAVE_POSS,
 		.pio_mask	= 0x1f,	/* pio0-4 */
 		.mwdma_mask	= 0x07, /* mwdma0-2 */
 		.port_ops	= &ns87560_pata_ops,
 	};

 	if (PCI_SLOT(pdev->devfn) == 0x0E)
 		ppi[0] = &info87560;
 #endif
 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &pdev->dev,
 			   "version " DRV_VERSION "\n");

 	rc = pcim_enable_device(pdev);
 	if (rc)
 		return rc;

 	/* Select 512 byte sectors */
 	pci_write_config_byte(pdev, 0x55, 0xEE);
 	/* Select PIO0 8bit clocking */
 	pci_write_config_byte(pdev, 0x54, 0xB7);
 	return ata_pci_init_one(pdev, ppi, &ns87415_sht, NULL);
 }

 static const struct pci_device_id ns87415_pci_tbl[] = {
 	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), },

 	{ }	/* terminate list */
 };

 static struct pci_driver ns87415_pci_driver = {
 	.name			= DRV_NAME,
 	.id_table		= ns87415_pci_tbl,
 	.probe			= ns87415_init_one,
 	.remove			= ata_pci_remove_one,
 #ifdef CONFIG_PM
 	.suspend		= ata_pci_device_suspend,
 	.resume			= ata_pci_device_resume,
 #endif
 };

 static int __init ns87415_init(void)
 {
 	return pci_register_driver(&ns87415_pci_driver);
 }

 static void __exit ns87415_exit(void)
 {
 	pci_unregister_driver(&ns87415_pci_driver);
 }

 module_init(ns87415_init);
 module_exit(ns87415_exit);

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("ATA low-level driver for NS87415 controllers");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
 MODULE_VERSION(DRV_VERSION);
	/*
	* pata_ns87415.c - NS87415 (non PARISC) PATA
	*
	* (C) 2005 Red Hat <alan@redhat.com>
	*
	* This is a fairly generic MWDMA controller. It has some limitations
	* as it requires timing reloads on PIO/DMA transitions but it is otherwise
	* fairly well designed.
	*
	* This driver assumes the firmware has left the chip in a valid ST506
	* compliant state, either legacy IRQ 14/15 or native INTA shared. You
	* may need to add platform code if your system fails to do this.
	*
	* The same cell appears in the 87560 controller used by some PARISC
	* systems. This has its own special mountain of errata.
	*
	* TODO:
	* Test PARISC SuperIO
	* Get someone to test on SPARC
	* Implement lazy pio/dma switching for better performance
	* 8bit shared timing.
	* See if we need to kill the FIFO for ATAPI
	*/

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

	#define DRV_NAME "pata_ns87415"
	#define DRV_VERSION "0.0.1"

	/**
	* ns87415_set_mode - Initialize host controller mode timings
	* @ap: Port whose timings we are configuring
	* @adev: Device whose timings we are configuring
	* @mode: Mode to set
	*
	* Program the mode registers for this controller, channel and
	* device. Because the chip is quite an old design we have to do this
	* for PIO/DMA switches.
	*
	* LOCKING:
	* None (inherited from caller).
	*/

	static void ns87415_set_mode(struct ata_port ap, struct ata_device adev, u8 mode)
	{
	struct pci_dev *dev = to_pci_dev(ap->host->dev);
	int unit = 2 * ap->port_no + adev->devno;
	int timing = 0x44 + 2 * unit;
	unsigned long T = 1000000000 / 33333; /* PCI clocks */
	struct ata_timing t;
	u16 clocking;
	u8 iordy;
	u8 status;

	/* Timing register format is 17 - low nybble read timing with
	the high nybble being 16 - x for recovery time in PCI clocks */

	ata_timing_compute(adev, adev->pio_mode, &t, T, 0);

	clocking = 17 - FIT(t.active, 2, 17);
	clocking \|= (16 - FIT(t.recover, 1, 16)) << 4;
	/* Use the same timing for read and write bytes */
	clocking \|= (clocking << 8);
	pci_write_config_word(dev, timing, clocking);

	/* Set the IORDY enable versus DMA enable on or off properly */
	pci_read_config_byte(dev, 0x42, &iordy);
	iordy &= ~(1 << (4 + unit));
	if (mode >= XFER_MW_DMA_0 \|\| !ata_pio_need_iordy(adev))
	iordy \|= (1 << (4 + unit));

	/* Paranoia: We shouldn't ever get here with busy write buffers
	but if so wait */

	pci_read_config_byte(dev, 0x43, &status);
	while (status & 0x03) {
	udelay(1);
	pci_read_config_byte(dev, 0x43, &status);
	}
	/* Flip the IORDY/DMA bits now we are sure the write buffers are
	clear */
	pci_write_config_byte(dev, 0x42, iordy);

	/* TODO: Set byte 54 command timing to the best 8bit
	mode shared by all four devices */
	}

	/**
	* ns87415_set_piomode - Initialize host controller PATA PIO timings
	* @ap: Port whose timings we are configuring
	* @adev: Device to program
	*
	* Set PIO mode for device, in host controller PCI config space.
	*
	* LOCKING:
	* None (inherited from caller).
	*/

	static void ns87415_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	ns87415_set_mode(ap, adev, adev->pio_mode);
	}

	/**
	* ns87415_bmdma_setup - Set up DMA
	* @qc: Command block
	*
	* Set up for bus masterng DMA. We have to do this ourselves
	* rather than use the helper due to a chip erratum
	*/

	static void ns87415_bmdma_setup(struct ata_queued_cmd *qc)
	{
	struct ata_port *ap = qc->ap;
	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
	u8 dmactl;

	/* load PRD table addr. */
	mb(); /* make sure PRD table writes are visible to controller */
	iowrite32(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);

	/* specify data direction, triple-check start bit is clear */
	dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
	dmactl &= ~(ATA_DMA_WR \| ATA_DMA_START);
	/* Due to an erratum we need to write these bits to the wrong
	place - which does save us an I/O bizarrely */
	dmactl \|= ATA_DMA_INTR \| ATA_DMA_ERR;
	if (!rw)
	dmactl \|= ATA_DMA_WR;
	iowrite8(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
	/* issue r/w command */
	ap->ops->exec_command(ap, &qc->tf);
	}

	/**
	* ns87415_bmdma_start - Begin DMA transfer
	* @qc: Command block
	*
	* Switch the timings for the chip and set up for a DMA transfer
	* before the DMA burst begins.
	*
	* FIXME: We should do lazy switching on bmdma_start versus
	* ata_pio_data_xfer for better performance.
	*/

	static void ns87415_bmdma_start(struct ata_queued_cmd *qc)
	{
	ns87415_set_mode(qc->ap, qc->dev, qc->dev->dma_mode);
	ata_bmdma_start(qc);
	}

	/**
	* ns87415_bmdma_stop - End DMA transfer
	* @qc: Command block
	*
	* End DMA mode and switch the controller back into PIO mode
	*/

	static void ns87415_bmdma_stop(struct ata_queued_cmd *qc)
	{
	ata_bmdma_stop(qc);
	ns87415_set_mode(qc->ap, qc->dev, qc->dev->pio_mode);
	}

	/**
	* ns87415_bmdma_irq_clear - Clear interrupt
	* @ap: Channel to clear
	*
	* Erratum: Due to a chip bug regisers 02 and 0A bit 1 and 2 (the
	* error bits) are reset by writing to register 00 or 08.
	*/

	static void ns87415_bmdma_irq_clear(struct ata_port *ap)
	{
	void __iomem *mmio = ap->ioaddr.bmdma_addr;

	if (!mmio)
	return;
	iowrite8((ioread8(mmio + ATA_DMA_CMD) \| ATA_DMA_INTR \| ATA_DMA_ERR),
	mmio + ATA_DMA_CMD);
	}

	/**
	* ns87415_check_atapi_dma - ATAPI DMA filter
	* @qc: Command block
	*
	* Disable ATAPI DMA (for now). We may be able to do DMA if we
	* kill the prefetching. This isn't clear.
	*/

	static int ns87415_check_atapi_dma(struct ata_queued_cmd *qc)
	{
	return -EOPNOTSUPP;
	}

	#if defined(CONFIG_SUPERIO)

	/* SUPERIO 87560 is a PoS chip that NatSem denies exists.
	* Unfortunately, it's built-in on all Astro-based PA-RISC workstations
	* which use the integrated NS87514 cell for CD-ROM support.
	* i.e we have to support for CD-ROM installs.
	* See drivers/parisc/superio.c for more gory details.
	*
	* Workarounds taken from drivers/ide/pci/ns87415.c
	*/

	#include <asm/superio.h>

	#define SUPERIO_IDE_MAX_RETRIES 25

	/**
	* ns87560_read_buggy - workaround buggy Super I/O chip
	* @port: Port to read
	*
	* Work around chipset problems in the 87560 SuperIO chip
	*/

	static u8 ns87560_read_buggy(void __iomem *port)
	{
	u8 tmp;
	int retries = SUPERIO_IDE_MAX_RETRIES;
	do {
	tmp = ioread8(port);
	if (tmp != 0)
	return tmp;
	udelay(50);
	} while(retries-- > 0);
	return tmp;
	}

	/**
	* ns87560_check_status
	* @ap: channel to check
	*
	* Return the status of the channel working around the
	* 87560 flaws.
	*/

	static u8 ns87560_check_status(struct ata_port *ap)
	{
	return ns87560_read_buggy(ap->ioaddr.status_addr);
	}

	/**
	* ns87560_tf_read - input device's ATA taskfile shadow registers
	* @ap: Port from which input is read
	* @tf: ATA taskfile register set for storing input
	*
	* Reads ATA taskfile registers for currently-selected device
	* into @tf. Work around the 87560 bugs.
	*
	* LOCKING:
	* Inherited from caller.
	*/
	void ns87560_tf_read(struct ata_port ap, struct ata_taskfile tf)
	{
	struct ata_ioports *ioaddr = &ap->ioaddr;

	tf->command = ns87560_check_status(ap);
	tf->feature = ioread8(ioaddr->error_addr);
	tf->nsect = ioread8(ioaddr->nsect_addr);
	tf->lbal = ioread8(ioaddr->lbal_addr);
	tf->lbam = ioread8(ioaddr->lbam_addr);
	tf->lbah = ioread8(ioaddr->lbah_addr);
	tf->device = ns87560_read_buggy(ioaddr->device_addr);

	if (tf->flags & ATA_TFLAG_LBA48) {
	iowrite8(tf->ctl \| ATA_HOB, ioaddr->ctl_addr);
	tf->hob_feature = ioread8(ioaddr->error_addr);
	tf->hob_nsect = ioread8(ioaddr->nsect_addr);
	tf->hob_lbal = ioread8(ioaddr->lbal_addr);
	tf->hob_lbam = ioread8(ioaddr->lbam_addr);
	tf->hob_lbah = ioread8(ioaddr->lbah_addr);
	iowrite8(tf->ctl, ioaddr->ctl_addr);
	ap->last_ctl = tf->ctl;
	}
	}

	/**
	* ns87560_bmdma_status
	* @ap: channel to check
	*
	* Return the DMA status of the channel working around the
	* 87560 flaws.
	*/

	static u8 ns87560_bmdma_status(struct ata_port *ap)
	{
	return ns87560_read_buggy(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
	}
	#endif /* 87560 SuperIO Support */

	static struct ata_port_operations ns87415_pata_ops = {
	.inherits = &ata_bmdma_port_ops,

	.check_atapi_dma = ns87415_check_atapi_dma,
	.bmdma_setup = ns87415_bmdma_setup,
	.bmdma_start = ns87415_bmdma_start,
	.bmdma_stop = ns87415_bmdma_stop,
	.irq_clear = ns87415_bmdma_irq_clear,

	.cable_detect = ata_cable_40wire,
	.set_piomode = ns87415_set_piomode,
	};

	#if defined(CONFIG_SUPERIO)
	static struct ata_port_operations ns87560_pata_ops = {
	.inherits = &ns87415_pata_ops,
	.tf_read = ns87560_tf_read,
	.check_status = ns87560_check_status,
	.bmdma_status = ns87560_bmdma_status,
	};
	#endif

	static struct scsi_host_template ns87415_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
	};


	/**
	* ns87415_init_one - Register 87415 ATA PCI device with kernel services
	* @pdev: PCI device to register
	* @ent: Entry in ns87415_pci_tbl matching with @pdev
	*
	* Called from kernel PCI layer. We probe for combined mode (sigh),
	* and then hand over control to libata, for it to do the rest.
	*
	* LOCKING:
	* Inherited from PCI layer (may sleep).
	*
	* RETURNS:
	* Zero on success, or -ERRNO value.
	*/

	static int ns87415_init_one (struct pci_dev pdev, const struct pci_device_id ent)
	{
	static int printed_version;
	static const struct ata_port_info info = {
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = 0x1f, /* pio0-4 */
	.mwdma_mask = 0x07, /* mwdma0-2 */
	.port_ops = &ns87415_pata_ops,
	};
	const struct ata_port_info *ppi[] = { &info, NULL };
	int rc;
	#if defined(CONFIG_SUPERIO)
	static const struct ata_port_info info87560 = {
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = 0x1f, /* pio0-4 */
	.mwdma_mask = 0x07, /* mwdma0-2 */
	.port_ops = &ns87560_pata_ops,
	};

	if (PCI_SLOT(pdev->devfn) == 0x0E)
	ppi[0] = &info87560;
	#endif
	if (!printed_version++)
	dev_printk(KERN_DEBUG, &pdev->dev,
	"version " DRV_VERSION "\n");

	rc = pcim_enable_device(pdev);
	if (rc)
	return rc;

	/* Select 512 byte sectors */
	pci_write_config_byte(pdev, 0x55, 0xEE);
	/* Select PIO0 8bit clocking */
	pci_write_config_byte(pdev, 0x54, 0xB7);
	return ata_pci_init_one(pdev, ppi, &ns87415_sht, NULL);
	}

	static const struct pci_device_id ns87415_pci_tbl[] = {
	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), },

	{ } /* terminate list */
	};

	static struct pci_driver ns87415_pci_driver = {
	.name = DRV_NAME,
	.id_table = ns87415_pci_tbl,
	.probe = ns87415_init_one,
	.remove = ata_pci_remove_one,
	#ifdef CONFIG_PM
	.suspend = ata_pci_device_suspend,
	.resume = ata_pci_device_resume,
	#endif
	};

	static int __init ns87415_init(void)
	{
	return pci_register_driver(&ns87415_pci_driver);
	}

	static void __exit ns87415_exit(void)
	{
	pci_unregister_driver(&ns87415_pci_driver);
	}

	module_init(ns87415_init);
	module_exit(ns87415_exit);

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("ATA low-level driver for NS87415 controllers");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
	MODULE_VERSION(DRV_VERSION);