ide-4drives.c

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#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/ide.h>

#define DRV_NAME "ide-4drives"

static bool probe_4drives;

module_param_named(probe, probe_4drives, bool, 0);
MODULE_PARM_DESC(probe, "probe for generic IDE chipset with 4 drives/port");

static void ide_4drives_init_dev(ide_drive_t *drive)
{
    if (drive->hwif->channel)
        drive->select ^= 0x20;
}

static const struct ide_port_ops ide_4drives_port_ops = {
    .init_dev       = ide_4drives_init_dev,
};

static const struct ide_port_info ide_4drives_port_info = {
    .port_ops       = &ide_4drives_port_ops,
    .host_flags     = IDE_HFLAG_SERIALIZE | IDE_HFLAG_NO_DMA |
                  IDE_HFLAG_4DRIVES,
    .chipset        = ide_4drives,
};

static int __init ide_4drives_init(void)
{
    unsigned long base = 0x1f0, ctl = 0x3f6;
    struct ide_hw hw, *hws[] = { &hw, &hw };

    if (probe_4drives == 0)
        return -ENODEV;

    if (!request_region(base, 8, DRV_NAME)) {
        printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
                DRV_NAME, base, base + 7);
        return -EBUSY;
    }

    if (!request_region(ctl, 1, DRV_NAME)) {
        printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
                DRV_NAME, ctl);
        release_region(base, 8);
        return -EBUSY;
    }

    memset(&hw, 0, sizeof(hw));

    ide_std_init_ports(&hw, base, ctl);
    hw.irq = 14;

    return ide_host_add(&ide_4drives_port_info, hws, 2, NULL);
}

module_init(ide_4drives_init);

MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("generic IDE chipset with 4 drives/port support");
MODULE_LICENSE("GPL");