falconide.c

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/*
 *  Atari Falcon IDE Driver
 *
 *     Created 12 Jul 1997 by Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/setup.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>
#include <asm/ide.h>

#define DRV_NAME "falconide"

    /*
     *  Base of the IDE interface
     */

#define ATA_HD_BASE 0xfff00000

    /*
     *  Offsets from the above base
     */

#define ATA_HD_CONTROL  0x39

    /*
     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
     *  which is shared between several drivers.
     */

static int falconide_intr_lock;

static void falconide_release_lock(void)
{
    if (falconide_intr_lock == 0) {
        printk(KERN_ERR "%s: bug\n", __func__);
        return;
    }
    falconide_intr_lock = 0;
    stdma_release();
}

static void falconide_get_lock(irq_handler_t handler, void *data)
{
    if (falconide_intr_lock == 0) {
        if (in_interrupt() > 0)
            panic("Falcon IDE hasn't ST-DMA lock in interrupt");
        stdma_lock(handler, data);
        falconide_intr_lock = 1;
    }
}

static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
                 void *buf, unsigned int len)
{
    unsigned long data_addr = drive->hwif->io_ports.data_addr;

    if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
        __ide_mm_insw(data_addr, buf, (len + 1) / 2);
        return;
    }

    raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
}

static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
                  void *buf, unsigned int len)
{
    unsigned long data_addr = drive->hwif->io_ports.data_addr;

    if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
        __ide_mm_outsw(data_addr, buf, (len + 1) / 2);
        return;
    }

    raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
}

/* Atari has a byte-swapped IDE interface */
static const struct ide_tp_ops falconide_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     = falconide_input_data,
    .output_data        = falconide_output_data,
};

static const struct ide_port_info falconide_port_info = {
    .get_lock       = falconide_get_lock,
    .release_lock       = falconide_release_lock,
    .tp_ops         = &falconide_tp_ops,
    .host_flags     = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
                  IDE_HFLAG_NO_DMA,
    .irq_flags      = IRQF_SHARED,
    .chipset        = ide_generic,
};

static void __init falconide_setup_ports(struct ide_hw *hw)
{
    int i;

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

    hw->io_ports.data_addr = ATA_HD_BASE;

    for (i = 1; i < 8; i++)
        hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;

    hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;

    hw->irq = IRQ_MFP_IDE;
}

    /*
     *  Probe for a Falcon IDE interface
     */

static int __init falconide_init(void)
{
    struct ide_host *host;
    struct ide_hw hw, *hws[] = { &hw };
    int rc;

    if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
        return -ENODEV;

    printk(KERN_INFO "ide: Falcon IDE controller\n");

    if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
        printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
        return -EBUSY;
    }

    falconide_setup_ports(&hw);

    host = ide_host_alloc(&falconide_port_info, hws, 1);
    if (host == NULL) {
        rc = -ENOMEM;
        goto err;
    }

    falconide_get_lock(NULL, NULL);
    rc = ide_host_register(host, &falconide_port_info, hws);
    falconide_release_lock();

    if (rc)
        goto err_free;

    return 0;
err_free:
    ide_host_free(host);
err:
    release_mem_region(ATA_HD_BASE, 0x40);
    return rc;
}

module_init(falconide_init);

MODULE_LICENSE("GPL");