LXR linux/drivers/ide/falconide.c

   1/*
   2 *  Atari Falcon IDE Driver
   3 *
   4 *     Created 12 Jul 1997 by Geert Uytterhoeven
   5 *
   6 *  This file is subject to the terms and conditions of the GNU General Public
   7 *  License.  See the file COPYING in the main directory of this archive for
   8 *  more details.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/types.h>
  13#include <linux/mm.h>
  14#include <linux/interrupt.h>
  15#include <linux/blkdev.h>
  16#include <linux/ide.h>
  17#include <linux/init.h>
  18
  19#include <asm/setup.h>
  20#include <asm/atarihw.h>
  21#include <asm/atariints.h>
  22#include <asm/atari_stdma.h>
  23
  24#define DRV_NAME "falconide"
  25
  26    /*
  27     *  Base of the IDE interface
  28     */
  29
  30#define ATA_HD_BASE     0xfff00000
  31
  32    /*
  33     *  Offsets from the above base
  34     */
  35
  36#define ATA_HD_CONTROL  0x39
  37
  38    /*
  39     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
  40     *  which is shared between several drivers.
  41     */
  42
  43int falconide_intr_lock;
  44EXPORT_SYMBOL(falconide_intr_lock);
  45
  46static void falconide_input_data(ide_drive_t *drive, struct request *rq,
  47                                 void *buf, unsigned int len)
  48{
  49        unsigned long data_addr = drive->hwif->io_ports.data_addr;
  50
  51        if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
  52                return insw(data_addr, buf, (len + 1) / 2);
  53
  54        insw_swapw(data_addr, buf, (len + 1) / 2);
  55}
  56
  57static void falconide_output_data(ide_drive_t *drive, struct request *rq,
  58                                  void *buf, unsigned int len)
  59{
  60        unsigned long data_addr = drive->hwif->io_ports.data_addr;
  61
  62        if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
  63                return outsw(data_addr, buf, (len + 1) / 2);
  64
  65        outsw_swapw(data_addr, buf, (len + 1) / 2);
  66}
  67
  68/* Atari has a byte-swapped IDE interface */
  69static const struct ide_tp_ops falconide_tp_ops = {
  70        .exec_command           = ide_exec_command,
  71        .read_status            = ide_read_status,
  72        .read_altstatus         = ide_read_altstatus,
  73        .read_sff_dma_status    = ide_read_sff_dma_status,
  74
  75        .set_irq                = ide_set_irq,
  76
  77        .tf_load                = ide_tf_load,
  78        .tf_read                = ide_tf_read,
  79
  80        .input_data             = falconide_input_data,
  81        .output_data            = falconide_output_data,
  82};
  83
  84static const struct ide_port_info falconide_port_info = {
  85        .tp_ops                 = &falconide_tp_ops,
  86        .host_flags             = IDE_HFLAG_NO_DMA,
  87};
  88
  89static void __init falconide_setup_ports(hw_regs_t *hw)
  90{
  91        int i;
  92
  93        memset(hw, 0, sizeof(*hw));
  94
  95        hw->io_ports.data_addr = ATA_HD_BASE;
  96
  97        for (i = 1; i < 8; i++)
  98                hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
  99
 100        hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
 101
 102        hw->irq = IRQ_MFP_IDE;
 103        hw->ack_intr = NULL;
 104
 105        hw->chipset = ide_generic;
 106}
 107
 108    /*
 109     *  Probe for a Falcon IDE interface
 110     */
 111
 112static int __init falconide_init(void)
 113{
 114        struct ide_host *host;
 115        hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
 116        int rc;
 117
 118        if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
 119                return -ENODEV;
 120
 121        printk(KERN_INFO "ide: Falcon IDE controller\n");
 122
 123        if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
 124                printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
 125                return -EBUSY;
 126        }
 127
 128        falconide_setup_ports(&hw);
 129
 130        host = ide_host_alloc(&falconide_port_info, hws);
 131        if (host == NULL) {
 132                rc = -ENOMEM;
 133                goto err;
 134        }
 135
 136        ide_get_lock(NULL, NULL);
 137        rc = ide_host_register(host, &falconide_port_info, hws);
 138        ide_release_lock();
 139
 140        if (rc)
 141                goto err_free;
 142
 143        return 0;
 144err_free:
 145        ide_host_free(host);
 146err:
 147        release_mem_region(ATA_HD_BASE, 0x40);
 148        return rc;
 149}
 150
 151module_init(falconide_init);
 152
 153MODULE_LICENSE("GPL");
 154