ide-h8300.c

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/*
 * H8/300 generic IDE interface
 */

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

#include <asm/io.h>
#include <asm/irq.h>

#define DRV_NAME "ide-h8300"

#define bswap(d) \
({                  \
    u16 r;              \
    __asm__("mov.b %w1,r1h\n\t" \
        "mov.b %x1,r1l\n\t" \
        "mov.w r1,%0"       \
        :"=r"(r)        \
        :"r"(d)         \
        :"er1");        \
    (r);                \
})

static void mm_outsw(unsigned long addr, void *buf, u32 len)
{
    unsigned short *bp = (unsigned short *)buf;
    for (; len > 0; len--, bp++)
        *(volatile u16 *)addr = bswap(*bp);
}

static void mm_insw(unsigned long addr, void *buf, u32 len)
{
    unsigned short *bp = (unsigned short *)buf;
    for (; len > 0; len--, bp++)
        *bp = bswap(*(volatile u16 *)addr);
}

static void h8300_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
                 void *buf, unsigned int len)
{
    mm_insw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
}

static void h8300_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
                  void *buf, unsigned int len)
{
    mm_outsw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
}

static const struct ide_tp_ops h8300_tp_ops = {
    .exec_command       = ide_exec_command,
    .read_status        = ide_read_status,
    .read_altstatus     = ide_read_altstatus,
    .write_devctl       = ide_write_devctl,

    .dev_select     = ide_dev_select,
    .tf_load        = ide_tf_load,
    .tf_read        = ide_tf_read,

    .input_data     = h8300_input_data,
    .output_data        = h8300_output_data,
};

#define H8300_IDE_GAP (2)

static inline void hw_setup(struct ide_hw *hw)
{
    int i;

    memset(hw, 0, sizeof(*hw));
    for (i = 0; i <= 7; i++)
        hw->io_ports_array[i] = CONFIG_H8300_IDE_BASE + H8300_IDE_GAP*i;
    hw->io_ports.ctl_addr = CONFIG_H8300_IDE_ALT;
    hw->irq = EXT_IRQ0 + CONFIG_H8300_IDE_IRQ;
}

static const struct ide_port_info h8300_port_info = {
    .tp_ops         = &h8300_tp_ops,
    .host_flags     = IDE_HFLAG_NO_IO_32BIT | IDE_HFLAG_NO_DMA,
    .chipset        = ide_generic,
};

static int __init h8300_ide_init(void)
{
    struct ide_hw hw, *hws[] = { &hw };

    printk(KERN_INFO DRV_NAME ": H8/300 generic IDE interface\n");

    if (!request_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8, "ide-h8300"))
        goto out_busy;
    if (!request_region(CONFIG_H8300_IDE_ALT, H8300_IDE_GAP, "ide-h8300")) {
        release_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8);
        goto out_busy;
    }

    hw_setup(&hw);

    return ide_host_add(&h8300_port_info, hws, 1, NULL);

out_busy:
    printk(KERN_ERR "ide-h8300: IDE I/F resource already used.\n");

    return -EBUSY;
}

module_init(h8300_ide_init);

MODULE_LICENSE("GPL");