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 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22
  23 #include <asm/macintosh.h>
  24
  25 #define DRV_NAME "mac_ide"
  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_test_irq(ide_hwif_t *hwif)
  59 {
  60         if (*ide_ifr & 0x20)
  61                 return 1;
  62         return 0;
  63 }
  64
  65 static void macide_clear_irq(ide_drive_t *drive)
  66 {
  67         *ide_ifr &= ~0x20;
  68 }
  69
  70 static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
  71                                       int irq)
  72 {
  73         int i;
  74
  75         memset(hw, 0, sizeof(*hw));
  76
  77         for (i = 0; i < 8; i++)
  78                 hw->io_ports_array[i] = base + i * 4;
  79
  80         hw->io_ports.ctl_addr = base + IDE_CONTROL;
  81
  82         hw->irq = irq;
  83 }
  84
  85 static const struct ide_port_ops macide_port_ops = {
  86         .clear_irq              = macide_clear_irq,
  87         .test_irq               = macide_test_irq,
  88 };
  89
  90 static const struct ide_port_info macide_port_info = {
  91         .port_ops               = &macide_port_ops,
  92         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
  93         .irq_flags              = IRQF_SHARED,
  94         .chipset                = ide_generic,
  95 };
  96
  97 static const char *mac_ide_name[] =
  98         { "Quadra", "Powerbook", "Powerbook Baboon" };
  99
 100 /*
 101  * Probe for a Macintosh IDE interface
 102  */
 103
 104 static int mac_ide_probe(struct platform_device *pdev)
 105 {
 106         struct resource *mem, *irq;
 107         struct ide_hw hw, *hws[] = { &hw };
 108         struct ide_port_info d = macide_port_info;
 109         struct ide_host *host;
 110         int rc;
 111
 112         if (!MACH_IS_MAC)
 113                 return -ENODEV;
 114
 115         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 116         if (!mem)
 117                 return -ENODEV;
 118
 119         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 120         if (!irq)
 121                 return -ENODEV;
 122
 123         if (!devm_request_mem_region(&pdev->dev, mem->start,
 124                                      resource_size(mem), DRV_NAME)) {
 125                 dev_err(&pdev->dev, "resources busy\n");
 126                 return -EBUSY;
 127         }
 128
 129         printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
 130                          mac_ide_name[macintosh_config->ide_type - 1]);
 131
 132         macide_setup_ports(&hw, mem->start, irq->start);
 133
 134         rc = ide_host_add(&d, hws, 1, &host);
 135         if (rc)
 136                 return rc;
 137
 138         platform_set_drvdata(pdev, host);
 139         return 0;
 140 }
 141
 142 static int mac_ide_remove(struct platform_device *pdev)
 143 {
 144         struct ide_host *host = platform_get_drvdata(pdev);
 145
 146         ide_host_remove(host);
 147         return 0;
 148 }
 149
 150 static struct platform_driver mac_ide_driver = {
 151         .driver = {
 152                 .name = DRV_NAME,
 153         },
 154         .probe  = mac_ide_probe,
 155         .remove = mac_ide_remove,
 156 };
 157
 158 module_platform_driver(mac_ide_driver);
 159
 160 MODULE_ALIAS("platform:" DRV_NAME);
 161 MODULE_LICENSE("GPL");