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
  21#include <asm/machw.h>
  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_ack_intr(ide_hwif_t* hwif)
  58{
  59        if (*ide_ifr & 0x20) {
  60                *ide_ifr &= ~0x20;
  61                return 1;
  62        }
  63        return 0;
  64}
  65
  66static void __init macide_setup_ports(hw_regs_t *hw, unsigned long base,
  67                                      int irq, ide_ack_intr_t *ack_intr)
  68{
  69        int i;
  70
  71        memset(hw, 0, sizeof(*hw));
  72
  73        for (i = 0; i < 8; i++)
  74                hw->io_ports_array[i] = base + i * 4;
  75
  76        hw->io_ports.ctl_addr = base + IDE_CONTROL;
  77
  78        hw->irq = irq;
  79        hw->ack_intr = ack_intr;
  80
  81        hw->chipset = ide_generic;
  82}
  83
  84static const char *mac_ide_name[] =
  85        { "Quadra", "Powerbook", "Powerbook Baboon" };
  86
  87/*
  88 * Probe for a Macintosh IDE interface
  89 */
  90
  91static int __init macide_init(void)
  92{
  93        ide_ack_intr_t *ack_intr;
  94        unsigned long base;
  95        int irq;
  96        hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
  97
  98        if (!MACH_IS_MAC)
  99                return -ENODEV;
 100
 101        switch (macintosh_config->ide_type) {
 102        case MAC_IDE_QUADRA:
 103                base = IDE_BASE;
 104                ack_intr = macide_ack_intr;
 105                irq = IRQ_NUBUS_F;
 106                break;
 107        case MAC_IDE_PB:
 108                base = IDE_BASE;
 109                ack_intr = macide_ack_intr;
 110                irq = IRQ_NUBUS_C;
 111                break;
 112        case MAC_IDE_BABOON:
 113                base = BABOON_BASE;
 114                ack_intr = NULL;
 115                irq = IRQ_BABOON_1;
 116                break;
 117        default:
 118                return -ENODEV;
 119        }
 120
 121        printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
 122                         mac_ide_name[macintosh_config->ide_type - 1]);
 123
 124        macide_setup_ports(&hw, base, irq, ack_intr);
 125
 126        return ide_host_add(NULL, hws, NULL);
 127}
 128
 129module_init(macide_init);
 130
 131MODULE_LICENSE("GPL");
 132