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                 *ide_ifr &= ~0x20;
  60                 return 1;
  61         }
  62         return 0;
  63 }
  64
  65 static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
  66                                       int irq, ide_ack_intr_t *ack_intr)
  67 {
  68         int i;
  69
  70         memset(hw, 0, sizeof(*hw));
  71
  72         for (i = 0; i < 8; i++)
  73                 hw->io_ports_array[i] = base + i * 4;
  74
  75         hw->io_ports.ctl_addr = base + IDE_CONTROL;
  76
  77         hw->irq = irq;
  78         hw->ack_intr = ack_intr;
  79 }
  80
  81 static const struct ide_port_info macide_port_info = {
  82         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
  83         .irq_flags              = IRQF_SHARED,
  84         .chipset                = ide_generic,
  85 };
  86
  87 static const char *mac_ide_name[] =
  88         { "Quadra", "Powerbook", "Powerbook Baboon" };
  89
  90 /*
  91  * Probe for a Macintosh IDE interface
  92  */
  93
  94 static int __init macide_init(void)
  95 {
  96         ide_ack_intr_t *ack_intr;
  97         unsigned long base;
  98         int irq;
  99         struct ide_hw hw, *hws[] = { &hw };
 100
 101         if (!MACH_IS_MAC)
 102                 return -ENODEV;
 103
 104         switch (macintosh_config->ide_type) {
 105         case MAC_IDE_QUADRA:
 106                 base = IDE_BASE;
 107                 ack_intr = macide_ack_intr;
 108                 irq = IRQ_NUBUS_F;
 109                 break;
 110         case MAC_IDE_PB:
 111                 base = IDE_BASE;
 112                 ack_intr = macide_ack_intr;
 113                 irq = IRQ_NUBUS_C;
 114                 break;
 115         case MAC_IDE_BABOON:
 116                 base = BABOON_BASE;
 117                 ack_intr = NULL;
 118                 irq = IRQ_BABOON_1;
 119                 break;
 120         default:
 121                 return -ENODEV;
 122         }
 123
 124         printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
 125                          mac_ide_name[macintosh_config->ide_type - 1]);
 126
 127         macide_setup_ports(&hw, base, irq, ack_intr);
 128
 129         return ide_host_add(&macide_port_info, hws, 1, NULL);
 130 }
 131
 132 module_init(macide_init);
 133
 134 MODULE_LICENSE("GPL");