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