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

 /*
  *	ACPI PATA driver
  *
  *	(c) 2007 Red Hat
  */

 #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 <acpi/acpi_bus.h>

 #include <linux/libata.h>
 #include <linux/ata.h>

 #define DRV_NAME	"pata_acpi"
 #define DRV_VERSION	"0.2.3"

 struct pata_acpi {
 	struct ata_acpi_gtm gtm;
 	void *last;
 	unsigned long mask[2];
 };

 /**
  *	pacpi_pre_reset	-	check for 40/80 pin
  *	@ap: Port
  *	@deadline: deadline jiffies for the operation
  *
  *	Perform the PATA port setup we need.
  */

 static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
 {
 	struct ata_port *ap = link->ap;
 	struct pata_acpi *acpi = ap->private_data;
 	if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
 		return -ENODEV;

 	return ata_sff_prereset(link, deadline);
 }

 /**
  *	pacpi_cable_detect	-	cable type detection
  *	@ap: port to detect
  *
  *	Perform device specific cable detection
  */

 static int pacpi_cable_detect(struct ata_port *ap)
 {
 	struct pata_acpi *acpi = ap->private_data;

 	if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
 		return ATA_CBL_PATA80;
 	else
 		return ATA_CBL_PATA40;
 }

 /**
  *	pacpi_discover_modes	-	filter non ACPI modes
  *	@adev: ATA device
  *	@mask: proposed modes
  *
  *	Try the modes available and see which ones the ACPI method will
  *	set up sensibly. From this we get a mask of ACPI modes we can use
  */

 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
 {
 	struct pata_acpi *acpi = ap->private_data;
 	struct ata_acpi_gtm probe;
 	unsigned int xfer_mask;

 	probe = acpi->gtm;

 	ata_acpi_gtm(ap, &probe);

 	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);

 	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
 		ap->cbl = ATA_CBL_PATA80;

 	return xfer_mask;
 }

 /**
  *	pacpi_mode_filter	-	mode filter for ACPI
  *	@adev: device
  *	@mask: mask of valid modes
  *
  *	Filter the valid mode list according to our own specific rules, in
  *	this case the list of discovered valid modes obtained by ACPI probing
  */

 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
 {
 	struct pata_acpi *acpi = adev->link->ap->private_data;
 	return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
 }

 /**
  *	pacpi_set_piomode	-	set initial PIO mode data
  *	@ap: ATA interface
  *	@adev: ATA device
  */

 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	int unit = adev->devno;
 	struct pata_acpi *acpi = ap->private_data;
 	const struct ata_timing *t;

 	if (!(acpi->gtm.flags & 0x10))
 		unit = 0;

 	/* Now stuff the nS values into the structure */
 	t = ata_timing_find_mode(adev->pio_mode);
 	acpi->gtm.drive[unit].pio = t->cycle;
 	ata_acpi_stm(ap, &acpi->gtm);
 	/* See what mode we actually got */
 	ata_acpi_gtm(ap, &acpi->gtm);
 }

 /**
  *	pacpi_set_dmamode	-	set initial DMA mode data
  *	@ap: ATA interface
  *	@adev: ATA device
  */

 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 {
 	int unit = adev->devno;
 	struct pata_acpi *acpi = ap->private_data;
 	const struct ata_timing *t;

 	if (!(acpi->gtm.flags & 0x10))
 		unit = 0;

 	/* Now stuff the nS values into the structure */
 	t = ata_timing_find_mode(adev->dma_mode);
 	if (adev->dma_mode >= XFER_UDMA_0) {
 		acpi->gtm.drive[unit].dma = t->udma;
 		acpi->gtm.flags |= (1 << (2 * unit));
 	} else {
 		acpi->gtm.drive[unit].dma = t->cycle;
 		acpi->gtm.flags &= ~(1 << (2 * unit));
 	}
 	ata_acpi_stm(ap, &acpi->gtm);
 	/* See what mode we actually got */
 	ata_acpi_gtm(ap, &acpi->gtm);
 }

 /**
  *	pacpi_qc_issue	-	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.
  */

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

 	if (acpi->gtm.flags & 0x10)
 		return ata_sff_qc_issue(qc);

 	if (adev != acpi->last) {
 		pacpi_set_piomode(ap, adev);
 		if (ata_dma_enabled(adev))
 			pacpi_set_dmamode(ap, adev);
 		acpi->last = adev;
 	}
 	return ata_sff_qc_issue(qc);
 }

 /**
  *	pacpi_port_start	-	port setup
  *	@ap: ATA port being set up
  *
  *	Use the port_start hook to maintain private control structures
  */

 static int pacpi_port_start(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	struct pata_acpi *acpi;

 	int ret;

 	if (ap->acpi_handle == NULL)
 		return -ENODEV;

 	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
 	if (ap->private_data == NULL)
 		return -ENOMEM;
 	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
 	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
 	ret = ata_sff_port_start(ap);
 	if (ret < 0)
 		return ret;

 	return ret;
 }

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

 static struct ata_port_operations pacpi_ops = {
 	.inherits		= &ata_bmdma_port_ops,
 	.qc_issue		= pacpi_qc_issue,
 	.cable_detect		= pacpi_cable_detect,
 	.mode_filter		= pacpi_mode_filter,
 	.set_piomode		= pacpi_set_piomode,
 	.set_dmamode		= pacpi_set_dmamode,
 	.prereset		= pacpi_pre_reset,
 	.port_start		= pacpi_port_start,
 };


 /**
  *	pacpi_init_one - Register ACPI ATA PCI device with kernel services
  *	@pdev: PCI device to register
  *	@ent: Entry in pacpi_pci_tbl matching with @pdev
  *
  *	Called from kernel PCI layer.
  *
  *	LOCKING:
  *	Inherited from PCI layer (may sleep).
  *
  *	RETURNS:
  *	Zero on success, or -ERRNO value.
  */

 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	static const struct ata_port_info info = {
 		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,

 		.pio_mask	= ATA_PIO4,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask 	= ATA_UDMA6,

 		.port_ops	= &pacpi_ops,
 	};
 	const struct ata_port_info *ppi[] = { &info, NULL };
 	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
 		int rc = pcim_enable_device(pdev);
 		if (rc < 0)
 			return rc;
 		pcim_pin_device(pdev);
 	}
 	return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
 }

 static const struct pci_device_id pacpi_pci_tbl[] = {
 	{ PCI_ANY_ID,		PCI_ANY_ID,			   PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
 	{ }	/* terminate list */
 };

 static struct pci_driver pacpi_pci_driver = {
 	.name			= DRV_NAME,
 	.id_table		= pacpi_pci_tbl,
 	.probe			= pacpi_init_one,
 	.remove			= ata_pci_remove_one,
 #ifdef CONFIG_PM
 	.suspend		= ata_pci_device_suspend,
 	.resume			= ata_pci_device_resume,
 #endif
 };

 static int __init pacpi_init(void)
 {
 	return pci_register_driver(&pacpi_pci_driver);
 }

 static void __exit pacpi_exit(void)
 {
 	pci_unregister_driver(&pacpi_pci_driver);
 }

 module_init(pacpi_init);
 module_exit(pacpi_exit);

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
 MODULE_VERSION(DRV_VERSION);
	/*
	* ACPI PATA driver
	*
	* (c) 2007 Red Hat
	*/

	#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 <acpi/acpi_bus.h>

	#include <linux/libata.h>
	#include <linux/ata.h>

	#define DRV_NAME "pata_acpi"
	#define DRV_VERSION "0.2.3"

	struct pata_acpi {
	struct ata_acpi_gtm gtm;
	void *last;
	unsigned long mask[2];
	};

	/**
	* pacpi_pre_reset - check for 40/80 pin
	* @ap: Port
	* @deadline: deadline jiffies for the operation
	*
	* Perform the PATA port setup we need.
	*/

	static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
	{
	struct ata_port *ap = link->ap;
	struct pata_acpi *acpi = ap->private_data;
	if (ap->acpi_handle == NULL \|\| ata_acpi_gtm(ap, &acpi->gtm) < 0)
	return -ENODEV;

	return ata_sff_prereset(link, deadline);
	}

	/**
	* pacpi_cable_detect - cable type detection
	* @ap: port to detect
	*
	* Perform device specific cable detection
	*/

	static int pacpi_cable_detect(struct ata_port *ap)
	{
	struct pata_acpi *acpi = ap->private_data;

	if ((acpi->mask[0] \| acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
	return ATA_CBL_PATA80;
	else
	return ATA_CBL_PATA40;
	}

	/**
	* pacpi_discover_modes - filter non ACPI modes
	* @adev: ATA device
	* @mask: proposed modes
	*
	* Try the modes available and see which ones the ACPI method will
	* set up sensibly. From this we get a mask of ACPI modes we can use
	*/

	static unsigned long pacpi_discover_modes(struct ata_port ap, struct ata_device adev)
	{
	struct pata_acpi *acpi = ap->private_data;
	struct ata_acpi_gtm probe;
	unsigned int xfer_mask;

	probe = acpi->gtm;

	ata_acpi_gtm(ap, &probe);

	xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);

	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
	ap->cbl = ATA_CBL_PATA80;

	return xfer_mask;
	}

	/**
	* pacpi_mode_filter - mode filter for ACPI
	* @adev: device
	* @mask: mask of valid modes
	*
	* Filter the valid mode list according to our own specific rules, in
	* this case the list of discovered valid modes obtained by ACPI probing
	*/

	static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
	{
	struct pata_acpi *acpi = adev->link->ap->private_data;
	return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
	}

	/**
	* pacpi_set_piomode - set initial PIO mode data
	* @ap: ATA interface
	* @adev: ATA device
	*/

	static void pacpi_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	int unit = adev->devno;
	struct pata_acpi *acpi = ap->private_data;
	const struct ata_timing *t;

	if (!(acpi->gtm.flags & 0x10))
	unit = 0;

	/* Now stuff the nS values into the structure */
	t = ata_timing_find_mode(adev->pio_mode);
	acpi->gtm.drive[unit].pio = t->cycle;
	ata_acpi_stm(ap, &acpi->gtm);
	/* See what mode we actually got */
	ata_acpi_gtm(ap, &acpi->gtm);
	}

	/**
	* pacpi_set_dmamode - set initial DMA mode data
	* @ap: ATA interface
	* @adev: ATA device
	*/

	static void pacpi_set_dmamode(struct ata_port ap, struct ata_device adev)
	{
	int unit = adev->devno;
	struct pata_acpi *acpi = ap->private_data;
	const struct ata_timing *t;

	if (!(acpi->gtm.flags & 0x10))
	unit = 0;

	/* Now stuff the nS values into the structure */
	t = ata_timing_find_mode(adev->dma_mode);
	if (adev->dma_mode >= XFER_UDMA_0) {
	acpi->gtm.drive[unit].dma = t->udma;
	acpi->gtm.flags \|= (1 << (2 * unit));
	} else {
	acpi->gtm.drive[unit].dma = t->cycle;
	acpi->gtm.flags &= ~(1 << (2 * unit));
	}
	ata_acpi_stm(ap, &acpi->gtm);
	/* See what mode we actually got */
	ata_acpi_gtm(ap, &acpi->gtm);
	}

	/**
	* pacpi_qc_issue - 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.
	*/

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

	if (acpi->gtm.flags & 0x10)
	return ata_sff_qc_issue(qc);

	if (adev != acpi->last) {
	pacpi_set_piomode(ap, adev);
	if (ata_dma_enabled(adev))
	pacpi_set_dmamode(ap, adev);
	acpi->last = adev;
	}
	return ata_sff_qc_issue(qc);
	}

	/**
	* pacpi_port_start - port setup
	* @ap: ATA port being set up
	*
	* Use the port_start hook to maintain private control structures
	*/

	static int pacpi_port_start(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct pata_acpi *acpi;

	int ret;

	if (ap->acpi_handle == NULL)
	return -ENODEV;

	acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
	if (ap->private_data == NULL)
	return -ENOMEM;
	acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
	acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
	ret = ata_sff_port_start(ap);
	if (ret < 0)
	return ret;

	return ret;
	}

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

	static struct ata_port_operations pacpi_ops = {
	.inherits = &ata_bmdma_port_ops,
	.qc_issue = pacpi_qc_issue,
	.cable_detect = pacpi_cable_detect,
	.mode_filter = pacpi_mode_filter,
	.set_piomode = pacpi_set_piomode,
	.set_dmamode = pacpi_set_dmamode,
	.prereset = pacpi_pre_reset,
	.port_start = pacpi_port_start,
	};


	/**
	* pacpi_init_one - Register ACPI ATA PCI device with kernel services
	* @pdev: PCI device to register
	* @ent: Entry in pacpi_pci_tbl matching with @pdev
	*
	* Called from kernel PCI layer.
	*
	* LOCKING:
	* Inherited from PCI layer (may sleep).
	*
	* RETURNS:
	* Zero on success, or -ERRNO value.
	*/

	static int pacpi_init_one (struct pci_dev pdev, const struct pci_device_id id)
	{
	static const struct ata_port_info info = {
	.flags = ATA_FLAG_SLAVE_POSS \| ATA_FLAG_SRST,

	.pio_mask = ATA_PIO4,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = ATA_UDMA6,

	.port_ops = &pacpi_ops,
	};
	const struct ata_port_info *ppi[] = { &info, NULL };
	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
	int rc = pcim_enable_device(pdev);
	if (rc < 0)
	return rc;
	pcim_pin_device(pdev);
	}
	return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
	}

	static const struct pci_device_id pacpi_pci_tbl[] = {
	{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
	{ } /* terminate list */
	};

	static struct pci_driver pacpi_pci_driver = {
	.name = DRV_NAME,
	.id_table = pacpi_pci_tbl,
	.probe = pacpi_init_one,
	.remove = ata_pci_remove_one,
	#ifdef CONFIG_PM
	.suspend = ata_pci_device_suspend,
	.resume = ata_pci_device_resume,
	#endif
	};

	static int __init pacpi_init(void)
	{
	return pci_register_driver(&pacpi_pci_driver);
	}

	static void __exit pacpi_exit(void)
	{
	pci_unregister_driver(&pacpi_pci_driver);
	}

	module_init(pacpi_init);
	module_exit(pacpi_exit);

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
	MODULE_VERSION(DRV_VERSION);