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
  43 int falconide_intr_lock;
  44 EXPORT_SYMBOL(falconide_intr_lock);
  45
  46 static 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
  57 static 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 */
  69 static 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
  74         .set_irq                = ide_set_irq,
  75
  76         .tf_load                = ide_tf_load,
  77         .tf_read                = ide_tf_read,
  78
  79         .input_data             = falconide_input_data,
  80         .output_data            = falconide_output_data,
  81 };
  82
  83 static const struct ide_port_info falconide_port_info = {
  84         .tp_ops                 = &falconide_tp_ops,
  85         .host_flags             = IDE_HFLAG_NO_DMA,
  86 };
  87
  88 static void __init falconide_setup_ports(hw_regs_t *hw)
  89 {
  90         int i;
  91
  92         memset(hw, 0, sizeof(*hw));
  93
  94         hw->io_ports.data_addr = ATA_HD_BASE;
  95
  96         for (i = 1; i < 8; i++)
  97                 hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
  98
  99         hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
 100
 101         hw->irq = IRQ_MFP_IDE;
 102         hw->ack_intr = NULL;
 103
 104         hw->chipset = ide_generic;
 105 }
 106
 107     /*
 108      *  Probe for a Falcon IDE interface
 109      */
 110
 111 static int __init falconide_init(void)
 112 {
 113         struct ide_host *host;
 114         hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
 115         int rc;
 116
 117         if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
 118                 return -ENODEV;
 119
 120         printk(KERN_INFO "ide: Falcon IDE controller\n");
 121
 122         if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
 123                 printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
 124                 return -EBUSY;
 125         }
 126
 127         falconide_setup_ports(&hw);
 128
 129         host = ide_host_alloc(&falconide_port_info, hws);
 130         if (host == NULL) {
 131                 rc = -ENOMEM;
 132                 goto err;
 133         }
 134
 135         ide_get_lock(NULL, NULL);
 136         rc = ide_host_register(host, &falconide_port_info, hws);
 137         ide_release_lock();
 138
 139         if (rc)
 140                 goto err_free;
 141
 142         return 0;
 143 err_free:
 144         ide_host_free(host);
 145 err:
 146         release_mem_region(ATA_HD_BASE, 0x40);
 147         return rc;
 148 }
 149
 150 module_init(falconide_init);
 151
 152 MODULE_LICENSE("GPL");