pata_acpi.c

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/*
 *  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 <linux/gfp.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];
};

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 (ata_ap_acpi_handle(ap) == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
        return -ENODEV;

    return ata_sff_prereset(link, deadline);
}

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;
}

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;
}

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

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);
}

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);
}

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_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);
}

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

    if (ata_ap_acpi_handle(ap) == 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 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,
};


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, 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
};

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);