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