pata_triflex.c

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/*
 * pata_triflex.c   - Compaq PATA for new ATA layer
 *            (C) 2005 Red Hat Inc
 *            Alan Cox <[email protected]>
 *
 * based upon
 *
 * triflex.c
 *
 * IDE Chipset driver for the Compaq TriFlex IDE controller.
 *
 * Known to work with the Compaq Workstation 5x00 series.
 *
 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
 * Author: Torben Mathiasen <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Loosely based on the piix & svwks drivers.
 *
 * Documentation:
 *  Not publicly available.
 */

#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 <scsi/scsi_host.h>
#include <linux/libata.h>

#define DRV_NAME "pata_triflex"
#define DRV_VERSION "0.2.8"

static int triflex_prereset(struct ata_link *link, unsigned long deadline)
{
    static const struct pci_bits triflex_enable_bits[] = {
        { 0x80, 1, 0x01, 0x01 },
        { 0x80, 1, 0x02, 0x02 }
    };

    struct ata_port *ap = link->ap;
    struct pci_dev *pdev = to_pci_dev(ap->host->dev);

    if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
        return -ENOENT;

    return ata_sff_prereset(link, deadline);
}



static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
{
    struct pci_dev *pdev = to_pci_dev(ap->host->dev);
    u32 timing = 0;
    u32 triflex_timing, old_triflex_timing;
    int channel_offset = ap->port_no ? 0x74: 0x70;
    unsigned int is_slave   = (adev->devno != 0);


    pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
    triflex_timing = old_triflex_timing;

    switch(speed)
    {
        case XFER_MW_DMA_2:
            timing = 0x0103;break;
        case XFER_MW_DMA_1:
            timing = 0x0203;break;
        case XFER_MW_DMA_0:
            timing = 0x0808;break;
        case XFER_SW_DMA_2:
        case XFER_SW_DMA_1:
        case XFER_SW_DMA_0:
            timing = 0x0F0F;break;
        case XFER_PIO_4:
            timing = 0x0202;break;
        case XFER_PIO_3:
            timing = 0x0204;break;
        case XFER_PIO_2:
            timing = 0x0404;break;
        case XFER_PIO_1:
            timing = 0x0508;break;
        case XFER_PIO_0:
            timing = 0x0808;break;
        default:
            BUG();
    }
    triflex_timing &= ~ (0xFFFF << (16 * is_slave));
    triflex_timing |= (timing << (16 * is_slave));

    if (triflex_timing != old_triflex_timing)
        pci_write_config_dword(pdev, channel_offset, triflex_timing);
}

static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
    triflex_load_timing(ap, adev, adev->pio_mode);
}

static void triflex_bmdma_start(struct ata_queued_cmd *qc)
{
    triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
    ata_bmdma_start(qc);
}

static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
{
    ata_bmdma_stop(qc);
    triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
}

static struct scsi_host_template triflex_sht = {
    ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations triflex_port_ops = {
    .inherits   = &ata_bmdma_port_ops,
    .bmdma_start    = triflex_bmdma_start,
    .bmdma_stop = triflex_bmdma_stop,
    .cable_detect   = ata_cable_40wire,
    .set_piomode    = triflex_set_piomode,
    .prereset   = triflex_prereset,
};

static int triflex_init_one(struct pci_dev *dev, 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,
        .port_ops = &triflex_port_ops
    };
    const struct ata_port_info *ppi[] = { &info, NULL };

    ata_print_version_once(&dev->dev, DRV_VERSION);

    return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
}

static const struct pci_device_id triflex[] = {
    { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },

    { },
};

#ifdef CONFIG_PM
static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
    struct ata_host *host = dev_get_drvdata(&pdev->dev);
    int rc = 0;

    rc = ata_host_suspend(host, mesg);
    if (rc)
        return rc;

    /*
     * We must not disable or powerdown the device.
     * APM bios refuses to suspend if IDE is not accessible.
     */
    pci_save_state(pdev);

    return 0;
}

#endif

static struct pci_driver triflex_pci_driver = {
    .name       = DRV_NAME,
    .id_table   = triflex,
    .probe      = triflex_init_one,
    .remove     = ata_pci_remove_one,
#ifdef CONFIG_PM
    .suspend    = triflex_ata_pci_device_suspend,
    .resume     = ata_pci_device_resume,
#endif
};

module_pci_driver(triflex_pci_driver);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, triflex);
MODULE_VERSION(DRV_VERSION);