LXR linux/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
  56volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
  57
  58int macide_test_irq(ide_hwif_t *hwif)
  59{
  60        if (*ide_ifr & 0x20)
  61                return 1;
  62        return 0;
  63}
  64
  65static void macide_clear_irq(ide_drive_t *drive)
  66{
  67        *ide_ifr &= ~0x20;
  68}
  69
  70static 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
  85static const struct ide_port_ops macide_port_ops = {
  86        .clear_irq              = macide_clear_irq,
  87        .test_irq               = macide_test_irq,
  88};
  89
  90static 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
  97static const char *mac_ide_name[] =
  98        { "Quadra", "Powerbook", "Powerbook Baboon" };
  99
 100/*
 101 * Probe for a Macintosh IDE interface
 102 */
 103
 104static 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
 142static 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
 150static 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
 158module_platform_driver(mac_ide_driver);
 159
 160MODULE_ALIAS("platform:" DRV_NAME);
 161MODULE_LICENSE("GPL");
 162