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 static void __init falconide_setup_ports(hw_regs_t *hw)
  70 {
  71         int i;
  72
  73         memset(hw, 0, sizeof(*hw));
  74
  75         hw->io_ports.data_addr = ATA_HD_BASE;
  76
  77         for (i = 1; i < 8; i++)
  78                 hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
  79
  80         hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
  81
  82         hw->irq = IRQ_MFP_IDE;
  83         hw->ack_intr = NULL;
  84 }
  85
  86     /*
  87      *  Probe for a Falcon IDE interface
  88      */
  89
  90 static int __init falconide_init(void)
  91 {
  92         hw_regs_t hw;
  93         ide_hwif_t *hwif;
  94
  95         if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
  96                 return 0;
  97
  98         printk(KERN_INFO "ide: Falcon IDE controller\n");
  99
 100         if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
 101                 printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
 102                 return -EBUSY;
 103         }
 104
 105         falconide_setup_ports(&hw);
 106
 107         hwif = ide_find_port();
 108         if (hwif) {
 109                 u8 index = hwif->index;
 110                 u8 idx[4] = { index, 0xff, 0xff, 0xff };
 111
 112                 ide_init_port_data(hwif, index);
 113                 ide_init_port_hw(hwif, &hw);
 114
 115                 /* Atari has a byte-swapped IDE interface */
 116                 hwif->input_data  = falconide_input_data;
 117                 hwif->output_data = falconide_output_data;
 118
 119                 ide_get_lock(NULL, NULL);
 120                 ide_device_add(idx, NULL);
 121                 ide_release_lock();
 122         }
 123
 124         return 0;
 125 }
 126
 127 module_init(falconide_init);
 128
 129 MODULE_LICENSE("GPL");