306 lines
7.0 KiB
C
306 lines
7.0 KiB
C
/*
|
|
* ACPI PATA driver
|
|
*
|
|
* (c) 2007 Red Hat <alan@redhat.com>
|
|
*/
|
|
|
|
#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 <acpi/acnames.h>
|
|
#include <acpi/acnamesp.h>
|
|
#include <acpi/acparser.h>
|
|
#include <acpi/acexcep.h>
|
|
#include <acpi/acmacros.h>
|
|
#include <acpi/actypes.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 (adev->dma_mode)
|
|
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 = 0x1f,
|
|
.mwdma_mask = 0x07,
|
|
.udma_mask = 0x7f,
|
|
|
|
.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);
|
|
|