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
  54 volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
  55
  56 int macide_ack_intr(ide_hwif_t* hwif)
  57 {
  58         if (*ide_ifr & 0x20)
  59                 return 1;
  60         return 0;
  61 }
  62
  63 static void macide_clear_irq(ide_drive_t *drive)
  64 {
  65         *ide_ifr &= ~0x20;
  66 }
  67
  68 static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
  69                                       int irq, ide_ack_intr_t *ack_intr)
  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         hw->ack_intr = ack_intr;
  82 }
  83
  84 static const struct ide_port_ops macide_port_ops = {
  85         .clear_irq              = macide_clear_irq,
  86 };
  87
  88 static 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
  95 static const char *mac_ide_name[] =
  96         { "Quadra", "Powerbook", "Powerbook Baboon" };
  97
  98 /*
  99  * Probe for a Macintosh IDE interface
 100  */
 101
 102 static int __init macide_init(void)
 103 {
 104         ide_ack_intr_t *ack_intr;
 105         unsigned long base;
 106         int irq;
 107         struct ide_hw hw, *hws[] = { &hw };
 108         struct ide_port_info d = macide_port_info;
 109
 110         if (!MACH_IS_MAC)
 111                 return -ENODEV;
 112
 113         switch (macintosh_config->ide_type) {
 114         case MAC_IDE_QUADRA:
 115                 base = IDE_BASE;
 116                 ack_intr = macide_ack_intr;
 117                 irq = IRQ_NUBUS_F;
 118                 break;
 119         case MAC_IDE_PB:
 120                 base = IDE_BASE;
 121                 ack_intr = macide_ack_intr;
 122                 irq = IRQ_NUBUS_C;
 123                 break;
 124         case MAC_IDE_BABOON:
 125                 base = BABOON_BASE;
 126                 ack_intr = NULL;
 127                 d.port_ops = NULL;
 128                 irq = IRQ_BABOON_1;
 129                 break;
 130         default:
 131                 return -ENODEV;
 132         }
 133
 134         printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
 135                          mac_ide_name[macintosh_config->ide_type - 1]);
 136
 137         macide_setup_ports(&hw, base, irq, ack_intr);
 138
 139         return ide_host_add(&d, hws, 1, NULL);
 140 }
 141
 142 module_init(macide_init);
 143
 144 MODULE_LICENSE("GPL");