linux/drivers/ide/legacy/macide.c
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   1/*
   2 *  linux/drivers/ide/legacy/macide.c -- 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/hdreg.h>
  19#include <linux/delay.h>
  20#include <linux/ide.h>
  21
  22#include <asm/machw.h>
  23#include <asm/macintosh.h>
  24#include <asm/macints.h>
  25#include <asm/mac_baboon.h>
  26
  27#define IDE_BASE 0x50F1A000     /* Base address of IDE controller */
  28
  29/*
  30 * Generic IDE registers as offsets from the base
  31 * These match MkLinux so they should be correct.
  32 */
  33
  34#define IDE_DATA        0x00
  35#define IDE_ERROR       0x04    /* see err-bits */
  36#define IDE_NSECTOR     0x08    /* nr of sectors to read/write */
  37#define IDE_SECTOR      0x0c    /* starting sector */
  38#define IDE_LCYL        0x10    /* starting cylinder */
  39#define IDE_HCYL        0x14    /* high byte of starting cyl */
  40#define IDE_SELECT      0x18    /* 101dhhhh , d=drive, hhhh=head */
  41#define IDE_STATUS      0x1c    /* see status-bits */
  42#define IDE_CONTROL     0x38    /* control/altstatus */
  43
  44/*
  45 * Mac-specific registers
  46 */
  47
  48/*
  49 * this register is odd; it doesn't seem to do much and it's
  50 * not word-aligned like virtually every other hardware register
  51 * on the Mac...
  52 */
  53
  54#define IDE_IFR         0x101   /* (0x101) IDE interrupt flags on Quadra:
  55                                 *
  56                                 * Bit 0+1: some interrupt flags
  57                                 * Bit 2+3: some interrupt enable
  58                                 * Bit 4:   ??
  59                                 * Bit 5:   IDE interrupt flag (any hwif)
  60                                 * Bit 6:   maybe IDE interrupt enable (any hwif) ??
  61                                 * Bit 7:   Any interrupt condition
  62                                 */
  63
  64volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
  65
  66static int macide_offsets[IDE_NR_PORTS] = {
  67    IDE_DATA, IDE_ERROR,  IDE_NSECTOR, IDE_SECTOR, IDE_LCYL,
  68    IDE_HCYL, IDE_SELECT, IDE_STATUS,  IDE_CONTROL
  69};
  70
  71int macide_ack_intr(ide_hwif_t* hwif)
  72{
  73        if (*ide_ifr & 0x20) {
  74                *ide_ifr &= ~0x20;
  75                return 1;
  76        }
  77        return 0;
  78}
  79
  80/*
  81 * Probe for a Macintosh IDE interface
  82 */
  83
  84void __init macide_init(void)
  85{
  86        hw_regs_t hw;
  87        ide_hwif_t *hwif;
  88        int index = -1;
  89
  90        switch (macintosh_config->ide_type) {
  91        case MAC_IDE_QUADRA:
  92                ide_setup_ports(&hw, IDE_BASE, macide_offsets,
  93                                0, 0, macide_ack_intr,
  94//                              quadra_ide_iops,
  95                                IRQ_NUBUS_F);
  96                index = ide_register_hw(&hw, NULL, 1, &hwif);
  97                break;
  98        case MAC_IDE_PB:
  99                ide_setup_ports(&hw, IDE_BASE, macide_offsets,
 100                                0, 0, macide_ack_intr,
 101//                              macide_pb_iops,
 102                                IRQ_NUBUS_C);
 103                index = ide_register_hw(&hw, NULL, 1, &hwif);
 104                break;
 105        case MAC_IDE_BABOON:
 106                ide_setup_ports(&hw, BABOON_BASE, macide_offsets,
 107                                0, 0, NULL,
 108//                              macide_baboon_iops,
 109                                IRQ_BABOON_1);
 110                index = ide_register_hw(&hw, NULL, 1, &hwif);
 111                if (index == -1) break;
 112                if (macintosh_config->ident == MAC_MODEL_PB190) {
 113
 114                        /* Fix breakage in ide-disk.c: drive capacity   */
 115                        /* is not initialized for drives without a      */
 116                        /* hardware ID, and we can't get that without   */
 117                        /* probing the drive which freezes a 190.       */
 118
 119                        ide_drive_t *drive = &ide_hwifs[index].drives[0];
 120                        drive->capacity64 = drive->cyl*drive->head*drive->sect;
 121
 122                }
 123                break;
 124
 125        default:
 126            return;
 127        }
 128
 129        if (index != -1) {
 130                hwif->mmio = 1;
 131                if (macintosh_config->ide_type == MAC_IDE_QUADRA)
 132                        printk(KERN_INFO "ide%d: Macintosh Quadra IDE interface\n", index);
 133                else if (macintosh_config->ide_type == MAC_IDE_PB)
 134                        printk(KERN_INFO "ide%d: Macintosh Powerbook IDE interface\n", index);
 135                else if (macintosh_config->ide_type == MAC_IDE_BABOON)
 136                        printk(KERN_INFO "ide%d: Macintosh Powerbook Baboon IDE interface\n", index);
 137                else
 138                        printk(KERN_INFO "ide%d: Unknown Macintosh IDE interface\n", index);
 139        }
 140}
 141
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