drivers/ide/legacy/macide.c

   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
  64 volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
  65
  66 static 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
  71 int 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
  84 void 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, 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, 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, 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 }