// SPDX-License-Identifier: GPL-2.0-only
/*
* ACPI PATA driver
*
* ( c ) 2007 Red Hat
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gfp.h>
#include <linux/acpi.h>
#include <linux/libata.h>
#include <linux/ata.h>
#include <scsi/scsi_host.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
* @ link : ATA link
* @ 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 (ACPI_HANDLE(&ap->tdev) == 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 ]) & (0 xF8 << ATA_SHIFT_UDMA))
return ATA_CBL_PATA80;
else
return ATA_CBL_PATA40;
}
/**
* pacpi_discover_modes - filter non ACPI modes
* @ ap : ATA port
* @ adev : ATA device
*
* 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 & (0 xF8 << 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 int pacpi_mode_filter(struct ata_device *adev, unsigned int mask)
{
struct pata_acpi *acpi = adev->link->ap->private_data;
return 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 & 0 x10))
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 & 0 x10))
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
* necessary .
*/
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 & 0 x10)
return ata_bmdma_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_bmdma_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;
if (ACPI_HANDLE(&ap->tdev) == 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 ]);
return ata_bmdma_port_start(ap);
}
static const 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,
.reset.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
* @ id : PCI device ID
*
* 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,
.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_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0 );
}
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 , 0 xFFFFFF00UL, 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_SLEEP
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
module_pci_driver(pacpi_pci_driver);
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);
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