pata_isapnp.c

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/*
 *   pata-isapnp.c - ISA PnP PATA controller driver.
 *   Copyright 2005/2006 Red Hat Inc, all rights reserved.
 *
 *   Based in part on ide-pnp.c by Andrey Panin <[email protected]>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/isapnp.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>

#define DRV_NAME "pata_isapnp"
#define DRV_VERSION "0.2.5"

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

static struct ata_port_operations isapnp_port_ops = {
    .inherits   = &ata_sff_port_ops,
    .cable_detect   = ata_cable_40wire,
};

static struct ata_port_operations isapnp_noalt_port_ops = {
    .inherits   = &ata_sff_port_ops,
    .cable_detect   = ata_cable_40wire,
    /* No altstatus so we don't want to use the lost interrupt poll */
    .lost_interrupt = ATA_OP_NULL,
};

static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev_id)
{
    struct ata_host *host;
    struct ata_port *ap;
    void __iomem *cmd_addr, *ctl_addr;
    int irq = 0;
    irq_handler_t handler = NULL;

    if (pnp_port_valid(idev, 0) == 0)
        return -ENODEV;

    if (pnp_irq_valid(idev, 0)) {
        irq = pnp_irq(idev, 0);
        handler = ata_sff_interrupt;
    }

    /* allocate host */
    host = ata_host_alloc(&idev->dev, 1);
    if (!host)
        return -ENOMEM;

    /* acquire resources and fill host */
    cmd_addr = devm_ioport_map(&idev->dev, pnp_port_start(idev, 0), 8);
    if (!cmd_addr)
        return -ENOMEM;

    ap = host->ports[0];

    ap->ops = &isapnp_noalt_port_ops;
    ap->pio_mask = ATA_PIO0;
    ap->flags |= ATA_FLAG_SLAVE_POSS;

    ap->ioaddr.cmd_addr = cmd_addr;

    if (pnp_port_valid(idev, 1) == 0) {
        ctl_addr = devm_ioport_map(&idev->dev,
                       pnp_port_start(idev, 1), 1);
        ap->ioaddr.altstatus_addr = ctl_addr;
        ap->ioaddr.ctl_addr = ctl_addr;
        ap->ops = &isapnp_port_ops;
    }

    ata_sff_std_ports(&ap->ioaddr);

    ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
              (unsigned long long)pnp_port_start(idev, 0),
              (unsigned long long)pnp_port_start(idev, 1));

    /* activate */
    return ata_host_activate(host, irq, handler, 0,
                 &isapnp_sht);
}

static void isapnp_remove_one(struct pnp_dev *idev)
{
    struct device *dev = &idev->dev;
    struct ata_host *host = dev_get_drvdata(dev);

    ata_host_detach(host);
}

static struct pnp_device_id isapnp_devices[] = {
    /* Generic ESDI/IDE/ATA compatible hard disk controller */
    {.id = "PNP0600", .driver_data = 0},
    {.id = ""}
};

MODULE_DEVICE_TABLE(pnp, isapnp_devices);

static struct pnp_driver isapnp_driver = {
    .name       = DRV_NAME,
    .id_table   = isapnp_devices,
    .probe      = isapnp_init_one,
    .remove     = isapnp_remove_one,
};

static int __init isapnp_init(void)
{
    return pnp_register_driver(&isapnp_driver);
}

static void __exit isapnp_exit(void)
{
    pnp_unregister_driver(&isapnp_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ISA PnP ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(isapnp_init);
module_exit(isapnp_exit);