drivers/ide/legacy/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/hdreg.h>
  17 #include <linux/ide.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/setup.h>
  21 #include <asm/atarihw.h>
  22 #include <asm/atariints.h>
  23 #include <asm/atari_stdma.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
  44 int falconide_intr_lock;
  45 EXPORT_SYMBOL(falconide_intr_lock);
  46
  47 static void falconide_input_data(ide_drive_t *drive, struct request *rq,
  48                                  void *buf, unsigned int len)
  49 {
  50         unsigned long data_addr = drive->hwif->io_ports.data_addr;
  51
  52         if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
  53                 return insw(data_addr, buf, (len + 1) / 2);
  54
  55         insw_swapw(data_addr, buf, (len + 1) / 2);
  56 }
  57
  58 static void falconide_output_data(ide_drive_t *drive, struct request *rq,
  59                                   void *buf, unsigned int len)
  60 {
  61         unsigned long data_addr = drive->hwif->io_ports.data_addr;
  62
  63         if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
  64                 return outsw(data_addr, buf, (len + 1) / 2);
  65
  66         outsw_swapw(data_addr, buf, (len + 1) / 2);
  67 }
  68
  69 /* Atari has a byte-swapped IDE interface */
  70 static const struct ide_tp_ops falconide_tp_ops = {
  71         .exec_command           = ide_exec_command,
  72         .read_status            = ide_read_status,
  73         .read_altstatus         = ide_read_altstatus,
  74         .read_sff_dma_status    = ide_read_sff_dma_status,
  75
  76         .set_irq                = ide_set_irq,
  77
  78         .tf_load                = ide_tf_load,
  79         .tf_read                = ide_tf_read,
  80
  81         .input_data             = falconide_input_data,
  82         .output_data            = falconide_output_data,
  83 };
  84
  85 static const struct ide_port_info falconide_port_info = {
  86         .tp_ops                 = &falconide_tp_ops,
  87         .host_flags             = IDE_HFLAG_NO_DMA,
  88 };
  89
  90 static void __init falconide_setup_ports(hw_regs_t *hw)
  91 {
  92         int i;
  93
  94         memset(hw, 0, sizeof(*hw));
  95
  96         hw->io_ports.data_addr = ATA_HD_BASE;
  97
  98         for (i = 1; i < 8; i++)
  99                 hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
 100
 101         hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
 102
 103         hw->irq = IRQ_MFP_IDE;
 104         hw->ack_intr = NULL;
 105
 106         hw->chipset = ide_generic;
 107 }
 108
 109     /*
 110      *  Probe for a Falcon IDE interface
 111      */
 112
 113 static int __init falconide_init(void)
 114 {
 115         struct ide_host *host;
 116         hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
 117         int rc;
 118
 119         if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
 120                 return -ENODEV;
 121
 122         printk(KERN_INFO "ide: Falcon IDE controller\n");
 123
 124         if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
 125                 printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
 126                 return -EBUSY;
 127         }
 128
 129         falconide_setup_ports(&hw);
 130
 131         host = ide_host_alloc(&falconide_port_info, hws);
 132         if (host == NULL) {
 133                 rc = -ENOMEM;
 134                 goto err;
 135         }
 136
 137         ide_get_lock(NULL, NULL);
 138         rc = ide_host_register(host, &falconide_port_info, hws);
 139         ide_release_lock();
 140
 141         if (rc)
 142                 goto err_free;
 143
 144         return 0;
 145 err_free:
 146         ide_host_free(host);
 147 err:
 148         release_mem_region(ATA_HD_BASE, 0x40);
 149         return rc;
 150 }
 151
 152 module_init(falconide_init);
 153
 154 MODULE_LICENSE("GPL");