295 lines
6.8 KiB
C
295 lines
6.8 KiB
C
/*
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* ACPI PATA driver
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*
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* (c) 2007 Red Hat
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/gfp.h>
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#include <scsi/scsi_host.h>
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#include <acpi/acpi_bus.h>
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#include <linux/libata.h>
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#include <linux/ata.h>
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#define DRV_NAME "pata_acpi"
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#define DRV_VERSION "0.2.3"
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struct pata_acpi {
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struct ata_acpi_gtm gtm;
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void *last;
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unsigned long mask[2];
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};
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/**
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* pacpi_pre_reset - check for 40/80 pin
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* @ap: Port
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* @deadline: deadline jiffies for the operation
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*
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* Perform the PATA port setup we need.
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*/
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static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
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{
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struct ata_port *ap = link->ap;
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struct pata_acpi *acpi = ap->private_data;
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if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
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return -ENODEV;
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return ata_sff_prereset(link, deadline);
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}
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/**
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* pacpi_cable_detect - cable type detection
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* @ap: port to detect
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*
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* Perform device specific cable detection
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*/
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static int pacpi_cable_detect(struct ata_port *ap)
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{
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struct pata_acpi *acpi = ap->private_data;
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if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
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return ATA_CBL_PATA80;
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else
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return ATA_CBL_PATA40;
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}
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/**
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* pacpi_discover_modes - filter non ACPI modes
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* @adev: ATA device
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* @mask: proposed modes
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*
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* Try the modes available and see which ones the ACPI method will
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* set up sensibly. From this we get a mask of ACPI modes we can use
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*/
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static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
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{
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struct pata_acpi *acpi = ap->private_data;
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struct ata_acpi_gtm probe;
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unsigned int xfer_mask;
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probe = acpi->gtm;
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ata_acpi_gtm(ap, &probe);
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xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
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if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
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ap->cbl = ATA_CBL_PATA80;
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return xfer_mask;
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}
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/**
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* pacpi_mode_filter - mode filter for ACPI
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* @adev: device
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* @mask: mask of valid modes
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*
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* Filter the valid mode list according to our own specific rules, in
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* this case the list of discovered valid modes obtained by ACPI probing
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*/
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static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
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{
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struct pata_acpi *acpi = adev->link->ap->private_data;
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return mask & acpi->mask[adev->devno];
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}
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/**
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* pacpi_set_piomode - set initial PIO mode data
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* @ap: ATA interface
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* @adev: ATA device
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*/
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static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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int unit = adev->devno;
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struct pata_acpi *acpi = ap->private_data;
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const struct ata_timing *t;
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if (!(acpi->gtm.flags & 0x10))
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unit = 0;
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/* Now stuff the nS values into the structure */
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t = ata_timing_find_mode(adev->pio_mode);
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acpi->gtm.drive[unit].pio = t->cycle;
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ata_acpi_stm(ap, &acpi->gtm);
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/* See what mode we actually got */
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ata_acpi_gtm(ap, &acpi->gtm);
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}
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/**
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* pacpi_set_dmamode - set initial DMA mode data
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* @ap: ATA interface
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* @adev: ATA device
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*/
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static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
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{
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int unit = adev->devno;
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struct pata_acpi *acpi = ap->private_data;
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const struct ata_timing *t;
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if (!(acpi->gtm.flags & 0x10))
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unit = 0;
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/* Now stuff the nS values into the structure */
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t = ata_timing_find_mode(adev->dma_mode);
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if (adev->dma_mode >= XFER_UDMA_0) {
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acpi->gtm.drive[unit].dma = t->udma;
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acpi->gtm.flags |= (1 << (2 * unit));
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} else {
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acpi->gtm.drive[unit].dma = t->cycle;
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acpi->gtm.flags &= ~(1 << (2 * unit));
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}
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ata_acpi_stm(ap, &acpi->gtm);
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/* See what mode we actually got */
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ata_acpi_gtm(ap, &acpi->gtm);
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}
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/**
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* pacpi_qc_issue - command issue
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* @qc: command pending
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*
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* Called when the libata layer is about to issue a command. We wrap
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* this interface so that we can load the correct ATA timings if
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* necessary.
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*/
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static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct ata_device *adev = qc->dev;
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struct pata_acpi *acpi = ap->private_data;
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if (acpi->gtm.flags & 0x10)
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return ata_bmdma_qc_issue(qc);
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if (adev != acpi->last) {
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pacpi_set_piomode(ap, adev);
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if (ata_dma_enabled(adev))
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pacpi_set_dmamode(ap, adev);
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acpi->last = adev;
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}
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return ata_bmdma_qc_issue(qc);
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}
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/**
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* pacpi_port_start - port setup
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* @ap: ATA port being set up
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*
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* Use the port_start hook to maintain private control structures
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*/
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static int pacpi_port_start(struct ata_port *ap)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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struct pata_acpi *acpi;
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if (ap->acpi_handle == NULL)
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return -ENODEV;
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acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
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if (ap->private_data == NULL)
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return -ENOMEM;
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acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
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acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
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return ata_bmdma_port_start(ap);
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}
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static struct scsi_host_template pacpi_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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};
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static struct ata_port_operations pacpi_ops = {
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.inherits = &ata_bmdma_port_ops,
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.qc_issue = pacpi_qc_issue,
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.cable_detect = pacpi_cable_detect,
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.mode_filter = pacpi_mode_filter,
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.set_piomode = pacpi_set_piomode,
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.set_dmamode = pacpi_set_dmamode,
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.prereset = pacpi_pre_reset,
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.port_start = pacpi_port_start,
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};
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/**
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* pacpi_init_one - Register ACPI ATA PCI device with kernel services
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* @pdev: PCI device to register
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* @ent: Entry in pacpi_pci_tbl matching with @pdev
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*
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* Called from kernel PCI layer.
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*
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* LOCKING:
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* Inherited from PCI layer (may sleep).
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*
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* RETURNS:
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* Zero on success, or -ERRNO value.
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*/
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static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
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{
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static const struct ata_port_info info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = ATA_PIO4,
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.mwdma_mask = ATA_MWDMA2,
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.udma_mask = ATA_UDMA6,
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.port_ops = &pacpi_ops,
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};
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const struct ata_port_info *ppi[] = { &info, NULL };
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if (pdev->vendor == PCI_VENDOR_ID_ATI) {
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int rc = pcim_enable_device(pdev);
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if (rc < 0)
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return rc;
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pcim_pin_device(pdev);
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}
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return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
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}
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static const struct pci_device_id pacpi_pci_tbl[] = {
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{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
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{ } /* terminate list */
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};
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static struct pci_driver pacpi_pci_driver = {
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.name = DRV_NAME,
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.id_table = pacpi_pci_tbl,
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.probe = pacpi_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM
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.suspend = ata_pci_device_suspend,
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.resume = ata_pci_device_resume,
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#endif
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};
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static int __init pacpi_init(void)
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{
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return pci_register_driver(&pacpi_pci_driver);
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}
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static void __exit pacpi_exit(void)
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{
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pci_unregister_driver(&pacpi_pci_driver);
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}
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module_init(pacpi_init);
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module_exit(pacpi_exit);
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
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MODULE_VERSION(DRV_VERSION);
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