drivers/ata/pata_sl82c105.c - android_kernel_htc_msm8960 - Gitiles

 /*
  * pata_sl82c105.c 	- SL82C105 PATA for new ATA layer
  *			  (C) 2005 Red Hat Inc
  *
  * Based in part on linux/drivers/ide/pci/sl82c105.c
  * 		SL82C105/Winbond 553 IDE driver
  *
  * and in part on the documentation and errata sheet
  *
  *
  * Note: The controller like many controllers has shared timings for
  * PIO and DMA. We thus flip to the DMA timings in dma_start and flip back
  * in the dma_stop function. Thus we actually don't need a set_dmamode
  * method as the PIO method is always called and will set the right PIO
  * timing parameters.
  */

 #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_sl82c105"
 #define DRV_VERSION "0.3.3"

 enum {
 	/*
 	 * SL82C105 PCI config register 0x40 bits.
 	 */
 	CTRL_IDE_IRQB	=	(1 << 30),
 	CTRL_IDE_IRQA   =	(1 << 28),
 	CTRL_LEGIRQ     =	(1 << 11),
 	CTRL_P1F16      =	(1 << 5),
 	CTRL_P1EN       =	(1 << 4),
 	CTRL_P0F16      =	(1 << 1),
 	CTRL_P0EN       =	(1 << 0)
 };

 /**
  *	sl82c105_pre_reset		-	probe begin
  *	@link: ATA link
  *	@deadline: deadline jiffies for the operation
  *
  *	Set up cable type and use generic probe init
  */

 static int sl82c105_pre_reset(struct ata_link *link, unsigned long deadline)
 {
 	static const struct pci_bits sl82c105_enable_bits[] = {
 		{ 0x40, 1, 0x01, 0x01 },
 		{ 0x40, 1, 0x10, 0x10 }
 	};
 	struct ata_port *ap = link->ap;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

 	if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no]))
 		return -ENOENT;
 	return ata_sff_prereset(link, deadline);
 }


 /**
  *	sl82c105_configure_piomode	-	set chip PIO timing
  *	@ap: ATA interface
  *	@adev: ATA device
  *	@pio: PIO mode
  *
  *	Called to do the PIO mode setup. Our timing registers are shared
  *	so a configure_dmamode call will undo any work we do here and vice
  *	versa
  */

 static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	static u16 pio_timing[5] = {
 		0x50D, 0x407, 0x304, 0x242, 0x240
 	};
 	u16 dummy;
 	int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);

 	pci_write_config_word(pdev, timing, pio_timing[pio]);
 	/* Can we lose this oddity of the old driver */
 	pci_read_config_word(pdev, timing, &dummy);
 }

 /**
  *	sl82c105_set_piomode	-	set initial PIO mode data
  *	@ap: ATA interface
  *	@adev: ATA device
  *
  *	Called to do the PIO mode setup. Our timing registers are shared
  *	but we want to set the PIO timing by default.
  */

 static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
 }

 /**
  *	sl82c105_configure_dmamode	-	set DMA mode in chip
  *	@ap: ATA interface
  *	@adev: ATA device
  *
  *	Load DMA cycle times into the chip ready for a DMA transfer
  *	to occur.
  */

 static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	static u16 dma_timing[3] = {
 		0x707, 0x201, 0x200
 	};
 	u16 dummy;
 	int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
 	int dma = adev->dma_mode - XFER_MW_DMA_0;

 	pci_write_config_word(pdev, timing, dma_timing[dma]);
 	/* Can we lose this oddity of the old driver */
 	pci_read_config_word(pdev, timing, &dummy);
 }

 /**
  *	sl82c105_reset_engine	-	Reset the DMA engine
  *	@ap: ATA interface
  *
  *	The sl82c105 has some serious problems with the DMA engine
  *	when transfers don't run as expected or ATAPI is used. The
  *	recommended fix is to reset the engine each use using a chip
  *	test register.
  */

 static void sl82c105_reset_engine(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	u16 val;

 	pci_read_config_word(pdev, 0x7E, &val);
 	pci_write_config_word(pdev, 0x7E, val | 4);
 	pci_write_config_word(pdev, 0x7E, val & ~4);
 }

 /**
  *	sl82c105_bmdma_start		-	DMA engine begin
  *	@qc: ATA command
  *
  *	Reset the DMA engine each use as recommended by the errata
  *	document.
  *
  *	FIXME: if we switch clock at BMDMA start/end we might get better
  *	PIO performance on DMA capable devices.
  */

 static void sl82c105_bmdma_start(struct ata_queued_cmd *qc)
 {
 	struct ata_port *ap = qc->ap;

 	udelay(100);
 	sl82c105_reset_engine(ap);
 	udelay(100);

 	/* Set the clocks for DMA */
 	sl82c105_configure_dmamode(ap, qc->dev);
 	/* Activate DMA */
 	ata_bmdma_start(qc);
 }

 /**
  *	sl82c105_bmdma_end		-	DMA engine stop
  *	@qc: ATA command
  *
  *	Reset the DMA engine each use as recommended by the errata
  *	document.
  *
  *	This function is also called to turn off DMA when a timeout occurs
  *	during DMA operation. In both cases we need to reset the engine,
  *	so no actual eng_timeout handler is required.
  *
  *	We assume bmdma_stop is always called if bmdma_start as called. If
  *	not then we may need to wrap qc_issue.
  */

 static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
 {
 	struct ata_port *ap = qc->ap;

 	ata_bmdma_stop(qc);
 	sl82c105_reset_engine(ap);
 	udelay(100);

 	/* This will redo the initial setup of the DMA device to matching
 	   PIO timings */
 	sl82c105_set_piomode(ap, qc->dev);
 }

 /**
  *	sl82c105_qc_defer	-	implement serialization
  *	@qc: command
  *
  *	We must issue one command per host not per channel because
  *	of the reset bug.
  *
  *	Q: is the scsi host lock sufficient ?
  */

 static int sl82c105_qc_defer(struct ata_queued_cmd *qc)
 {
 	struct ata_host *host = qc->ap->host;
 	struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
 	int rc;

 	/* First apply the usual rules */
 	rc = ata_std_qc_defer(qc);
 	if (rc != 0)
 		return rc;

 	/* Now apply serialization rules. Only allow a command if the
 	   other channel state machine is idle */
 	if (alt && alt->qc_active)
 		return	ATA_DEFER_PORT;
 	return 0;
 }

 static bool sl82c105_sff_irq_check(struct ata_port *ap)
 {
 	struct pci_dev *pdev	= to_pci_dev(ap->host->dev);
 	u32 val, mask		= ap->port_no ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;

 	pci_read_config_dword(pdev, 0x40, &val);

 	return val & mask;
 }

 static struct scsi_host_template sl82c105_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 };

 static struct ata_port_operations sl82c105_port_ops = {
 	.inherits	= &ata_bmdma_port_ops,
 	.qc_defer	= sl82c105_qc_defer,
 	.bmdma_start 	= sl82c105_bmdma_start,
 	.bmdma_stop	= sl82c105_bmdma_stop,
 	.cable_detect	= ata_cable_40wire,
 	.set_piomode	= sl82c105_set_piomode,
 	.prereset	= sl82c105_pre_reset,
 	.sff_irq_check	= sl82c105_sff_irq_check,
 };

 /**
  *	sl82c105_bridge_revision	-	find bridge version
  *	@pdev: PCI device for the ATA function
  *
  *	Locates the PCI bridge associated with the ATA function and
  *	providing it is a Winbond 553 reports the revision. If it cannot
  *	find a revision or the right device it returns -1
  */

 static int sl82c105_bridge_revision(struct pci_dev *pdev)
 {
 	struct pci_dev *bridge;

 	/*
 	 * The bridge should be part of the same device, but function 0.
 	 */
 	bridge = pci_get_slot(pdev->bus,
 			       PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
 	if (!bridge)
 		return -1;

 	/*
 	 * Make sure it is a Winbond 553 and is an ISA bridge.
 	 */
 	if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
 	    bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
 	    bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
 	    	pci_dev_put(bridge);
 		return -1;
 	}
 	/*
 	 * We need to find function 0's revision, not function 1
 	 */
 	pci_dev_put(bridge);
 	return bridge->revision;
 }


 static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	static const struct ata_port_info info_dma = {
 		.flags = ATA_FLAG_SLAVE_POSS,
 		.pio_mask = ATA_PIO4,
 		.mwdma_mask = ATA_MWDMA2,
 		.port_ops = &sl82c105_port_ops
 	};
 	static const struct ata_port_info info_early = {
 		.flags = ATA_FLAG_SLAVE_POSS,
 		.pio_mask = ATA_PIO4,
 		.port_ops = &sl82c105_port_ops
 	};
 	/* for now use only the first port */
 	const struct ata_port_info *ppi[] = { &info_early,
 					       NULL };
 	u32 val;
 	int rev;
 	int rc;

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

 	rev = sl82c105_bridge_revision(dev);

 	if (rev == -1)
 		dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n");
 	else if (rev <= 5)
 		dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n");
 	else
 		ppi[0] = &info_dma;

 	pci_read_config_dword(dev, 0x40, &val);
 	val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
 	pci_write_config_dword(dev, 0x40, val);

 	return ata_pci_bmdma_init_one(dev, ppi, &sl82c105_sht, NULL, 0);
 }

 static const struct pci_device_id sl82c105[] = {
 	{ PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), },

 	{ },
 };

 static struct pci_driver sl82c105_pci_driver = {
 	.name 		= DRV_NAME,
 	.id_table	= sl82c105,
 	.probe 		= sl82c105_init_one,
 	.remove		= ata_pci_remove_one
 };

 static int __init sl82c105_init(void)
 {
 	return pci_register_driver(&sl82c105_pci_driver);
 }

 static void __exit sl82c105_exit(void)
 {
 	pci_unregister_driver(&sl82c105_pci_driver);
 }

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("low-level driver for Sl82c105");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, sl82c105);
 MODULE_VERSION(DRV_VERSION);

 module_init(sl82c105_init);
 module_exit(sl82c105_exit);
	/*
	* pata_sl82c105.c - SL82C105 PATA for new ATA layer
	* (C) 2005 Red Hat Inc
	*
	* Based in part on linux/drivers/ide/pci/sl82c105.c
	* SL82C105/Winbond 553 IDE driver
	*
	* and in part on the documentation and errata sheet
	*
	*
	* Note: The controller like many controllers has shared timings for
	* PIO and DMA. We thus flip to the DMA timings in dma_start and flip back
	* in the dma_stop function. Thus we actually don't need a set_dmamode
	* method as the PIO method is always called and will set the right PIO
	* timing parameters.
	*/

	#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_sl82c105"
	#define DRV_VERSION "0.3.3"

	enum {
	/*
	* SL82C105 PCI config register 0x40 bits.
	*/
	CTRL_IDE_IRQB = (1 << 30),
	CTRL_IDE_IRQA = (1 << 28),
	CTRL_LEGIRQ = (1 << 11),
	CTRL_P1F16 = (1 << 5),
	CTRL_P1EN = (1 << 4),
	CTRL_P0F16 = (1 << 1),
	CTRL_P0EN = (1 << 0)
	};

	/**
	* sl82c105_pre_reset - probe begin
	* @link: ATA link
	* @deadline: deadline jiffies for the operation
	*
	* Set up cable type and use generic probe init
	*/

	static int sl82c105_pre_reset(struct ata_link *link, unsigned long deadline)
	{
	static const struct pci_bits sl82c105_enable_bits[] = {
	{ 0x40, 1, 0x01, 0x01 },
	{ 0x40, 1, 0x10, 0x10 }
	};
	struct ata_port *ap = link->ap;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

	if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no]))
	return -ENOENT;
	return ata_sff_prereset(link, deadline);
	}


	/**
	* sl82c105_configure_piomode - set chip PIO timing
	* @ap: ATA interface
	* @adev: ATA device
	* @pio: PIO mode
	*
	* Called to do the PIO mode setup. Our timing registers are shared
	* so a configure_dmamode call will undo any work we do here and vice
	* versa
	*/

	static void sl82c105_configure_piomode(struct ata_port ap, struct ata_device adev, int pio)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	static u16 pio_timing[5] = {
	0x50D, 0x407, 0x304, 0x242, 0x240
	};
	u16 dummy;
	int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);

	pci_write_config_word(pdev, timing, pio_timing[pio]);
	/* Can we lose this oddity of the old driver */
	pci_read_config_word(pdev, timing, &dummy);
	}

	/**
	* sl82c105_set_piomode - set initial PIO mode data
	* @ap: ATA interface
	* @adev: ATA device
	*
	* Called to do the PIO mode setup. Our timing registers are shared
	* but we want to set the PIO timing by default.
	*/

	static void sl82c105_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
	}

	/**
	* sl82c105_configure_dmamode - set DMA mode in chip
	* @ap: ATA interface
	* @adev: ATA device
	*
	* Load DMA cycle times into the chip ready for a DMA transfer
	* to occur.
	*/

	static void sl82c105_configure_dmamode(struct ata_port ap, struct ata_device adev)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	static u16 dma_timing[3] = {
	0x707, 0x201, 0x200
	};
	u16 dummy;
	int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
	int dma = adev->dma_mode - XFER_MW_DMA_0;

	pci_write_config_word(pdev, timing, dma_timing[dma]);
	/* Can we lose this oddity of the old driver */
	pci_read_config_word(pdev, timing, &dummy);
	}

	/**
	* sl82c105_reset_engine - Reset the DMA engine
	* @ap: ATA interface
	*
	* The sl82c105 has some serious problems with the DMA engine
	* when transfers don't run as expected or ATAPI is used. The
	* recommended fix is to reset the engine each use using a chip
	* test register.
	*/

	static void sl82c105_reset_engine(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u16 val;

	pci_read_config_word(pdev, 0x7E, &val);
	pci_write_config_word(pdev, 0x7E, val \| 4);
	pci_write_config_word(pdev, 0x7E, val & ~4);
	}

	/**
	* sl82c105_bmdma_start - DMA engine begin
	* @qc: ATA command
	*
	* Reset the DMA engine each use as recommended by the errata
	* document.
	*
	* FIXME: if we switch clock at BMDMA start/end we might get better
	* PIO performance on DMA capable devices.
	*/

	static void sl82c105_bmdma_start(struct ata_queued_cmd *qc)
	{
	struct ata_port *ap = qc->ap;

	udelay(100);
	sl82c105_reset_engine(ap);
	udelay(100);

	/* Set the clocks for DMA */
	sl82c105_configure_dmamode(ap, qc->dev);
	/* Activate DMA */
	ata_bmdma_start(qc);
	}

	/**
	* sl82c105_bmdma_end - DMA engine stop
	* @qc: ATA command
	*
	* Reset the DMA engine each use as recommended by the errata
	* document.
	*
	* This function is also called to turn off DMA when a timeout occurs
	* during DMA operation. In both cases we need to reset the engine,
	* so no actual eng_timeout handler is required.
	*
	* We assume bmdma_stop is always called if bmdma_start as called. If
	* not then we may need to wrap qc_issue.
	*/

	static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
	{
	struct ata_port *ap = qc->ap;

	ata_bmdma_stop(qc);
	sl82c105_reset_engine(ap);
	udelay(100);

	/* This will redo the initial setup of the DMA device to matching
	PIO timings */
	sl82c105_set_piomode(ap, qc->dev);
	}

	/**
	* sl82c105_qc_defer - implement serialization
	* @qc: command
	*
	* We must issue one command per host not per channel because
	* of the reset bug.
	*
	* Q: is the scsi host lock sufficient ?
	*/

	static int sl82c105_qc_defer(struct ata_queued_cmd *qc)
	{
	struct ata_host *host = qc->ap->host;
	struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
	int rc;

	/* First apply the usual rules */
	rc = ata_std_qc_defer(qc);
	if (rc != 0)
	return rc;

	/* Now apply serialization rules. Only allow a command if the
	other channel state machine is idle */
	if (alt && alt->qc_active)
	return ATA_DEFER_PORT;
	return 0;
	}

	static bool sl82c105_sff_irq_check(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u32 val, mask = ap->port_no ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;

	pci_read_config_dword(pdev, 0x40, &val);

	return val & mask;
	}

	static struct scsi_host_template sl82c105_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
	};

	static struct ata_port_operations sl82c105_port_ops = {
	.inherits = &ata_bmdma_port_ops,
	.qc_defer = sl82c105_qc_defer,
	.bmdma_start = sl82c105_bmdma_start,
	.bmdma_stop = sl82c105_bmdma_stop,
	.cable_detect = ata_cable_40wire,
	.set_piomode = sl82c105_set_piomode,
	.prereset = sl82c105_pre_reset,
	.sff_irq_check = sl82c105_sff_irq_check,
	};

	/**
	* sl82c105_bridge_revision - find bridge version
	* @pdev: PCI device for the ATA function
	*
	* Locates the PCI bridge associated with the ATA function and
	* providing it is a Winbond 553 reports the revision. If it cannot
	* find a revision or the right device it returns -1
	*/

	static int sl82c105_bridge_revision(struct pci_dev *pdev)
	{
	struct pci_dev *bridge;

	/*
	* The bridge should be part of the same device, but function 0.
	*/
	bridge = pci_get_slot(pdev->bus,
	PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
	if (!bridge)
	return -1;

	/*
	* Make sure it is a Winbond 553 and is an ISA bridge.
	*/
	if (bridge->vendor != PCI_VENDOR_ID_WINBOND \|\|
	bridge->device != PCI_DEVICE_ID_WINBOND_83C553 \|\|
	bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
	pci_dev_put(bridge);
	return -1;
	}
	/*
	* We need to find function 0's revision, not function 1
	*/
	pci_dev_put(bridge);
	return bridge->revision;
	}


	static int sl82c105_init_one(struct pci_dev dev, const struct pci_device_id id)
	{
	static const struct ata_port_info info_dma = {
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = ATA_PIO4,
	.mwdma_mask = ATA_MWDMA2,
	.port_ops = &sl82c105_port_ops
	};
	static const struct ata_port_info info_early = {
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = ATA_PIO4,
	.port_ops = &sl82c105_port_ops
	};
	/* for now use only the first port */
	const struct ata_port_info *ppi[] = { &info_early,
	NULL };
	u32 val;
	int rev;
	int rc;

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

	rev = sl82c105_bridge_revision(dev);

	if (rev == -1)
	dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n");
	else if (rev <= 5)
	dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n");
	else
	ppi[0] = &info_dma;

	pci_read_config_dword(dev, 0x40, &val);
	val \|= CTRL_P0EN \| CTRL_P0F16 \| CTRL_P1F16;
	pci_write_config_dword(dev, 0x40, val);

	return ata_pci_bmdma_init_one(dev, ppi, &sl82c105_sht, NULL, 0);
	}

	static const struct pci_device_id sl82c105[] = {
	{ PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), },

	{ },
	};

	static struct pci_driver sl82c105_pci_driver = {
	.name = DRV_NAME,
	.id_table = sl82c105,
	.probe = sl82c105_init_one,
	.remove = ata_pci_remove_one
	};

	static int __init sl82c105_init(void)
	{
	return pci_register_driver(&sl82c105_pci_driver);
	}

	static void __exit sl82c105_exit(void)
	{
	pci_unregister_driver(&sl82c105_pci_driver);
	}

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("low-level driver for Sl82c105");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, sl82c105);
	MODULE_VERSION(DRV_VERSION);

	module_init(sl82c105_init);
	module_exit(sl82c105_exit);