pata_rz1000.c

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/*
 *  RZ1000/1001 driver based upon
 *
 *  linux/drivers/ide/pci/rz1000.c  Version 0.06    January 12, 2003
 *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
 *  Principal Author:  [email protected] (Mark Lord)
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 *  This file provides support for disabling the buggy read-ahead
 *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
 */

#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_rz1000"
#define DRV_VERSION "0.2.4"


static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
{
    struct ata_device *dev;

    ata_for_each_dev(dev, link, ENABLED) {
        /* We don't really care */
        dev->pio_mode = XFER_PIO_0;
        dev->xfer_mode = XFER_PIO_0;
        dev->xfer_shift = ATA_SHIFT_PIO;
        dev->flags |= ATA_DFLAG_PIO;
        ata_dev_info(dev, "configured for PIO\n");
    }
    return 0;
}


static struct scsi_host_template rz1000_sht = {
    ATA_PIO_SHT(DRV_NAME),
};

static struct ata_port_operations rz1000_port_ops = {
    .inherits   = &ata_sff_port_ops,
    .cable_detect   = ata_cable_40wire,
    .set_mode   = rz1000_set_mode,
};

static int rz1000_fifo_disable(struct pci_dev *pdev)
{
    u16 reg;
    /* Be exceptionally paranoid as we must be sure to apply the fix */
    if (pci_read_config_word(pdev, 0x40, &reg) != 0)
        return -1;
    reg &= 0xDFFF;
    if (pci_write_config_word(pdev, 0x40, reg) != 0)
        return -1;
    printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
    return 0;
}

static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
    static const struct ata_port_info info = {
        .flags = ATA_FLAG_SLAVE_POSS,
        .pio_mask = ATA_PIO4,
        .port_ops = &rz1000_port_ops
    };
    const struct ata_port_info *ppi[] = { &info, NULL };

    ata_print_version_once(&pdev->dev, DRV_VERSION);

    if (rz1000_fifo_disable(pdev) == 0)
        return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0);

    printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
    /* Not safe to use so skip */
    return -ENODEV;
}

#ifdef CONFIG_PM
static int rz1000_reinit_one(struct pci_dev *pdev)
{
    struct ata_host *host = dev_get_drvdata(&pdev->dev);
    int rc;

    rc = ata_pci_device_do_resume(pdev);
    if (rc)
        return rc;

    /* If this fails on resume (which is a "can't happen" case), we
       must stop as any progress risks data loss */
    if (rz1000_fifo_disable(pdev))
        panic("rz1000 fifo");

    ata_host_resume(host);
    return 0;
}
#endif

static const struct pci_device_id pata_rz1000[] = {
    { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
    { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },

    { },
};

static struct pci_driver rz1000_pci_driver = {
    .name       = DRV_NAME,
    .id_table   = pata_rz1000,
    .probe      = rz1000_init_one,
    .remove     = ata_pci_remove_one,
#ifdef CONFIG_PM
    .suspend    = ata_pci_device_suspend,
    .resume     = rz1000_reinit_one,
#endif
};

module_pci_driver(rz1000_pci_driver);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pata_rz1000);
MODULE_VERSION(DRV_VERSION);