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/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
  55 volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
  56
  57 int 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
  66 static 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
  84 static const char *mac_ide_name[] =
  85         { "Quadra", "Powerbook", "Powerbook Baboon" };
  86
  87 /*
  88  * Probe for a Macintosh IDE interface
  89  */
  90
  91 static 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
 129 module_init(macide_init);
 130
 131 MODULE_LICENSE("GPL");