drivers/ide/macide.c

   1 /*
   2  *  Macintosh IDE Driver
   3  *
   4  *     Copyright (C) 1998 by Michael Schmitz
   5  *
   6  *  This driver was written based on information obtained from the MacOS IDE
   7  *  driver binary by Mikael Forselius
   8  *
   9  *  This file is subject to the terms and conditions of the GNU General Public
  10  *  License.  See the file COPYING in the main directory of this archive for
  11  *  more details.
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/delay.h>
  19 #include <linux/ide.h>
  20 #include <linux/module.h>
  21
  22 #include <asm/macintosh.h>
  23 #include <asm/macints.h>
  24 #include <asm/mac_baboon.h>
  25
  26 #define IDE_BASE 0x50F1A000     /* Base address of IDE controller */
  27
  28 /*
  29  * Generic IDE registers as offsets from the base
  30  * These match MkLinux so they should be correct.
  31  */
  32
  33 #define IDE_CONTROL     0x38    /* control/altstatus */
  34
  35 /*
  36  * Mac-specific registers
  37  */
  38
  39 /*
  40  * this register is odd; it doesn't seem to do much and it's
  41  * not word-aligned like virtually every other hardware register
  42  * on the Mac...
  43  */
  44
  45 #define IDE_IFR         0x101   /* (0x101) IDE interrupt flags on Quadra:
  46                                  *
  47                                  * Bit 0+1: some interrupt flags
  48                                  * Bit 2+3: some interrupt enable
  49                                  * Bit 4:   ??
  50                                  * Bit 5:   IDE interrupt flag (any hwif)
  51                                  * Bit 6:   maybe IDE interrupt enable (any hwif) ??
  52                                  * Bit 7:   Any interrupt condition
  53                                  */
  54
  55 volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
  56
  57 int macide_test_irq(ide_hwif_t *hwif)
  58 {
  59         if (*ide_ifr & 0x20)
  60                 return 1;
  61         return 0;
  62 }
  63
  64 static void macide_clear_irq(ide_drive_t *drive)
  65 {
  66         *ide_ifr &= ~0x20;
  67 }
  68
  69 static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
  70                                       int irq)
  71 {
  72         int i;
  73
  74         memset(hw, 0, sizeof(*hw));
  75
  76         for (i = 0; i < 8; i++)
  77                 hw->io_ports_array[i] = base + i * 4;
  78
  79         hw->io_ports.ctl_addr = base + IDE_CONTROL;
  80
  81         hw->irq = irq;
  82 }
  83
  84 static const struct ide_port_ops macide_port_ops = {
  85         .clear_irq              = macide_clear_irq,
  86         .test_irq               = macide_test_irq,
  87 };
  88
  89 static const struct ide_port_info macide_port_info = {
  90         .port_ops               = &macide_port_ops,
  91         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
  92         .irq_flags              = IRQF_SHARED,
  93         .chipset                = ide_generic,
  94 };
  95
  96 static const char *mac_ide_name[] =
  97         { "Quadra", "Powerbook", "Powerbook Baboon" };
  98
  99 /*
 100  * Probe for a Macintosh IDE interface
 101  */
 102
 103 static int __init macide_init(void)
 104 {
 105         unsigned long base;
 106         int irq;
 107         struct ide_hw hw, *hws[] = { &hw };
 108         struct ide_port_info d = macide_port_info;
 109
 110         if (!MACH_IS_MAC)
 111                 return -ENODEV;
 112
 113         switch (macintosh_config->ide_type) {
 114         case MAC_IDE_QUADRA:
 115                 base = IDE_BASE;
 116                 irq = IRQ_NUBUS_F;
 117                 break;
 118         case MAC_IDE_PB:
 119                 base = IDE_BASE;
 120                 irq = IRQ_NUBUS_C;
 121                 break;
 122         case MAC_IDE_BABOON:
 123                 base = BABOON_BASE;
 124                 d.port_ops = NULL;
 125                 irq = IRQ_BABOON_1;
 126                 break;
 127         default:
 128                 return -ENODEV;
 129         }
 130
 131         printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
 132                          mac_ide_name[macintosh_config->ide_type - 1]);
 133
 134         macide_setup_ports(&hw, base, irq);
 135
 136         return ide_host_add(&d, hws, 1, NULL);
 137 }
 138
 139 module_init(macide_init);
 140
 141 MODULE_LICENSE("GPL");