drivers/ide/legacy/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/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_CONTROL     0x38    /* control/altstatus */
  35
  36 /*
  37  * Mac-specific registers
  38  */
  39
  40 /*
  41  * this register is odd; it doesn't seem to do much and it's
  42  * not word-aligned like virtually every other hardware register
  43  * on the Mac...
  44  */
  45
  46 #define IDE_IFR         0x101   /* (0x101) IDE interrupt flags on Quadra:
  47                                  *
  48                                  * Bit 0+1: some interrupt flags
  49                                  * Bit 2+3: some interrupt enable
  50                                  * Bit 4:   ??
  51                                  * Bit 5:   IDE interrupt flag (any hwif)
  52                                  * Bit 6:   maybe IDE interrupt enable (any hwif) ??
  53                                  * Bit 7:   Any interrupt condition
  54                                  */
  55
  56 volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
  57
  58 int macide_ack_intr(ide_hwif_t* hwif)
  59 {
  60         if (*ide_ifr & 0x20) {
  61                 *ide_ifr &= ~0x20;
  62                 return 1;
  63         }
  64         return 0;
  65 }
  66
  67 static void __init macide_setup_ports(hw_regs_t *hw, unsigned long base,
  68                                       int irq, ide_ack_intr_t *ack_intr)
  69 {
  70         int i;
  71
  72         memset(hw, 0, sizeof(*hw));
  73
  74         for (i = 0; i < 8; i++)
  75                 hw->io_ports_array[i] = base + i * 4;
  76
  77         hw->io_ports.ctl_addr = base + IDE_CONTROL;
  78
  79         hw->irq = irq;
  80         hw->ack_intr = ack_intr;
  81
  82         hw->chipset = ide_generic;
  83 }
  84
  85 static const char *mac_ide_name[] =
  86         { "Quadra", "Powerbook", "Powerbook Baboon" };
  87
  88 /*
  89  * Probe for a Macintosh IDE interface
  90  */
  91
  92 static int __init macide_init(void)
  93 {
  94         ide_ack_intr_t *ack_intr;
  95         unsigned long base;
  96         int irq;
  97         hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
  98
  99         if (!MACH_IS_MAC)
 100                 return -ENODEV;
 101
 102         switch (macintosh_config->ide_type) {
 103         case MAC_IDE_QUADRA:
 104                 base = IDE_BASE;
 105                 ack_intr = macide_ack_intr;
 106                 irq = IRQ_NUBUS_F;
 107                 break;
 108         case MAC_IDE_PB:
 109                 base = IDE_BASE;
 110                 ack_intr = macide_ack_intr;
 111                 irq = IRQ_NUBUS_C;
 112                 break;
 113         case MAC_IDE_BABOON:
 114                 base = BABOON_BASE;
 115                 ack_intr = NULL;
 116                 irq = IRQ_BABOON_1;
 117                 break;
 118         default:
 119                 return -ENODEV;
 120         }
 121
 122         printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
 123                          mac_ide_name[macintosh_config->ide_type - 1]);
 124
 125         macide_setup_ports(&hw, base, irq, ack_intr);
 126
 127         return ide_host_add(NULL, hws, NULL);
 128 }
 129
 130 module_init(macide_init);
 131
 132 MODULE_LICENSE("GPL");