355 lines
8.4 KiB
C
355 lines
8.4 KiB
C
/*
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* ACPI PATA driver
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*
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* (c) 2007 Red Hat <alan@redhat.com>
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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 <scsi/scsi_host.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acnames.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acparser.h>
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#include <acpi/acexcep.h>
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#include <acpi/acmacros.h>
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#include <acpi/actypes.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_std_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_error_handler - Setup and error handler
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* @ap: Port to handle
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*
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* LOCKING:
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* None (inherited from caller).
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*/
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static void pacpi_error_handler(struct ata_port *ap)
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{
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return ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset,
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NULL, ata_std_postreset);
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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 ata_pci_default_filter(adev, 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_prot - 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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* neccessary.
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*/
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static unsigned int pacpi_qc_issue_prot(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_qc_issue_prot(qc);
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if (adev != acpi->last) {
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pacpi_set_piomode(ap, adev);
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if (adev->dma_mode)
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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_qc_issue_prot(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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int ret;
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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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ret = ata_sff_port_start(ap);
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if (ret < 0)
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return ret;
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return ret;
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}
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static struct scsi_host_template pacpi_sht = {
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.module = THIS_MODULE,
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.name = DRV_NAME,
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.ioctl = ata_scsi_ioctl,
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.queuecommand = ata_scsi_queuecmd,
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.can_queue = ATA_DEF_QUEUE,
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.this_id = ATA_SHT_THIS_ID,
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.sg_tablesize = LIBATA_MAX_PRD,
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.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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.emulated = ATA_SHT_EMULATED,
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.use_clustering = ATA_SHT_USE_CLUSTERING,
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.proc_name = DRV_NAME,
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.dma_boundary = ATA_DMA_BOUNDARY,
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.slave_configure = ata_scsi_slave_config,
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.slave_destroy = ata_scsi_slave_destroy,
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/* Use standard CHS mapping rules */
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.bios_param = ata_std_bios_param,
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};
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static const struct ata_port_operations pacpi_ops = {
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.set_piomode = pacpi_set_piomode,
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.set_dmamode = pacpi_set_dmamode,
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.mode_filter = pacpi_mode_filter,
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/* Task file is PCI ATA format, use helpers */
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.tf_load = ata_tf_load,
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.tf_read = ata_tf_read,
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.check_status = ata_check_status,
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.exec_command = ata_exec_command,
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.dev_select = ata_std_dev_select,
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.freeze = ata_bmdma_freeze,
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.thaw = ata_bmdma_thaw,
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.error_handler = pacpi_error_handler,
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.post_internal_cmd = ata_bmdma_post_internal_cmd,
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.cable_detect = pacpi_cable_detect,
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/* BMDMA handling is PCI ATA format, use helpers */
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.bmdma_setup = ata_bmdma_setup,
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.bmdma_start = ata_bmdma_start,
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.bmdma_stop = ata_bmdma_stop,
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.bmdma_status = ata_bmdma_status,
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.qc_prep = ata_qc_prep,
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.qc_issue = pacpi_qc_issue_prot,
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.data_xfer = ata_data_xfer,
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/* Timeout handling */
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.irq_handler = ata_interrupt,
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.irq_clear = ata_bmdma_irq_clear,
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.irq_on = ata_irq_on,
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/* Generic PATA PCI ATA helpers */
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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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.sht = &pacpi_sht,
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.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
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.pio_mask = 0x1f,
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.mwdma_mask = 0x07,
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.udma_mask = 0x7f,
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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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return ata_pci_init_one(pdev, ppi);
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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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