linux/drivers/ide/falconide.c
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   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#include <asm/ide.h>
  24
  25#define DRV_NAME "falconide"
  26
  27    /*
  28     *  Base of the IDE interface
  29     */
  30
  31#define ATA_HD_BASE     0xfff00000
  32
  33    /*
  34     *  Offsets from the above base
  35     */
  36
  37#define ATA_HD_CONTROL  0x39
  38
  39    /*
  40     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
  41     *  which is shared between several drivers.
  42     */
  43
  44static int falconide_intr_lock;
  45
  46static void falconide_release_lock(void)
  47{
  48        if (falconide_intr_lock == 0) {
  49                printk(KERN_ERR "%s: bug\n", __func__);
  50                return;
  51        }
  52        falconide_intr_lock = 0;
  53        stdma_release();
  54}
  55
  56static void falconide_get_lock(irq_handler_t handler, void *data)
  57{
  58        if (falconide_intr_lock == 0) {
  59                if (in_interrupt() > 0)
  60                        panic("Falcon IDE hasn't ST-DMA lock in interrupt");
  61                stdma_lock(handler, data);
  62                falconide_intr_lock = 1;
  63        }
  64}
  65
  66static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
  67                                 void *buf, unsigned int len)
  68{
  69        unsigned long data_addr = drive->hwif->io_ports.data_addr;
  70
  71        if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
  72                __ide_mm_insw(data_addr, buf, (len + 1) / 2);
  73                return;
  74        }
  75
  76        raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
  77}
  78
  79static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
  80                                  void *buf, unsigned int len)
  81{
  82        unsigned long data_addr = drive->hwif->io_ports.data_addr;
  83
  84        if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
  85                __ide_mm_outsw(data_addr, buf, (len + 1) / 2);
  86                return;
  87        }
  88
  89        raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
  90}
  91
  92/* Atari has a byte-swapped IDE interface */
  93static const struct ide_tp_ops falconide_tp_ops = {
  94        .exec_command           = ide_exec_command,
  95        .read_status            = ide_read_status,
  96        .read_altstatus         = ide_read_altstatus,
  97        .write_devctl           = ide_write_devctl,
  98
  99        .dev_select             = ide_dev_select,
 100        .tf_load                = ide_tf_load,
 101        .tf_read                = ide_tf_read,
 102
 103        .input_data             = falconide_input_data,
 104        .output_data            = falconide_output_data,
 105};
 106
 107static const struct ide_port_info falconide_port_info = {
 108        .get_lock               = falconide_get_lock,
 109        .release_lock           = falconide_release_lock,
 110        .tp_ops                 = &falconide_tp_ops,
 111        .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
 112                                  IDE_HFLAG_NO_DMA,
 113        .irq_flags              = IRQF_SHARED,
 114        .chipset                = ide_generic,
 115};
 116
 117static void __init falconide_setup_ports(struct ide_hw *hw)
 118{
 119        int i;
 120
 121        memset(hw, 0, sizeof(*hw));
 122
 123        hw->io_ports.data_addr = ATA_HD_BASE;
 124
 125        for (i = 1; i < 8; i++)
 126                hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
 127
 128        hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
 129
 130        hw->irq = IRQ_MFP_IDE;
 131}
 132
 133    /*
 134     *  Probe for a Falcon IDE interface
 135     */
 136
 137static int __init falconide_init(void)
 138{
 139        struct ide_host *host;
 140        struct ide_hw hw, *hws[] = { &hw };
 141        int rc;
 142
 143        if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
 144                return -ENODEV;
 145
 146        printk(KERN_INFO "ide: Falcon IDE controller\n");
 147
 148        if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
 149                printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
 150                return -EBUSY;
 151        }
 152
 153        falconide_setup_ports(&hw);
 154
 155        host = ide_host_alloc(&falconide_port_info, hws, 1);
 156        if (host == NULL) {
 157                rc = -ENOMEM;
 158                goto err;
 159        }
 160
 161        falconide_get_lock(NULL, NULL);
 162        rc = ide_host_register(host, &falconide_port_info, hws);
 163        falconide_release_lock();
 164
 165        if (rc)
 166                goto err_free;
 167
 168        return 0;
 169err_free:
 170        ide_host_free(host);
 171err:
 172        release_mem_region(ATA_HD_BASE, 0x40);
 173        return rc;
 174}
 175
 176module_init(falconide_init);
 177
 178MODULE_LICENSE("GPL");
 179
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