linux/drivers/ide/macide.c
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   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
  55volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
  56
  57int macide_test_irq(ide_hwif_t *hwif)
  58{
  59        if (*ide_ifr & 0x20)
  60                return 1;
  61        return 0;
  62}
  63
  64static void macide_clear_irq(ide_drive_t *drive)
  65{
  66        *ide_ifr &= ~0x20;
  67}
  68
  69static 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
  84static const struct ide_port_ops macide_port_ops = {
  85        .clear_irq              = macide_clear_irq,
  86        .test_irq               = macide_test_irq,
  87};
  88
  89static 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
  96static const char *mac_ide_name[] =
  97        { "Quadra", "Powerbook", "Powerbook Baboon" };
  98
  99/*
 100 * Probe for a Macintosh IDE interface
 101 */
 102
 103static 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
 139module_init(macide_init);
 140
 141MODULE_LICENSE("GPL");
 142
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