release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/ide/gayle.c

   1 /*
   2  *  Amiga Gayle IDE Driver
   3  *
   4  *     Created 9 Jul 1997 by Geert Uytterhoeven
   5  *
   6  *  This file is subject to the terms and conditions of the GNU General Public
   7  *  License.  See the file COPYING in the main directory of this archive for
   8  *  more details.
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/mm.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/ide.h>
  16 #include <linux/init.h>
  17 #include <linux/zorro.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20
  21 #include <asm/setup.h>
  22 #include <asm/amigahw.h>
  23 #include <asm/amigaints.h>
  24 #include <asm/amigayle.h>
  25
  26
  27     /*
  28      *  Offsets from one of the above bases
  29      */
  30
  31 #define GAYLE_CONTROL   0x101a
  32
  33     /*
  34      *  These are at different offsets from the base
  35      */
  36
  37 #define GAYLE_IRQ_4000  0xdd3020        /* MSB = 1, Harddisk is source of */
  38 #define GAYLE_IRQ_1200  0xda9000        /* interrupt */
  39
  40
  41     /*
  42      *  Offset of the secondary port for IDE doublers
  43      *  Note that GAYLE_CONTROL is NOT available then!
  44      */
  45
  46 #define GAYLE_NEXT_PORT 0x1000
  47
  48 #define GAYLE_NUM_HWIFS         2
  49 #define GAYLE_NUM_PROBE_HWIFS   (ide_doubler ? GAYLE_NUM_HWIFS : \
  50                                                GAYLE_NUM_HWIFS-1)
  51 #define GAYLE_HAS_CONTROL_REG   (!ide_doubler)
  52
  53 static int ide_doubler;
  54 module_param_named(doubler, ide_doubler, bool, 0);
  55 MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
  56
  57     /*
  58      *  Check and acknowledge the interrupt status
  59      */
  60
  61 static int gayle_test_irq(ide_hwif_t *hwif)
  62 {
  63         unsigned char ch;
  64
  65         ch = z_readb(hwif->io_ports.irq_addr);
  66         if (!(ch & GAYLE_IRQ_IDE))
  67                 return 0;
  68         return 1;
  69 }
  70
  71 static void gayle_a1200_clear_irq(ide_drive_t *drive)
  72 {
  73         ide_hwif_t *hwif = drive->hwif;
  74
  75         (void)z_readb(hwif->io_ports.status_addr);
  76         z_writeb(0x7c, hwif->io_ports.irq_addr);
  77 }
  78
  79 static void __init gayle_setup_ports(struct ide_hw *hw, unsigned long base,
  80                                      unsigned long ctl, unsigned long irq_port)
  81 {
  82         int i;
  83
  84         memset(hw, 0, sizeof(*hw));
  85
  86         hw->io_ports.data_addr = base;
  87
  88         for (i = 1; i < 8; i++)
  89                 hw->io_ports_array[i] = base + 2 + i * 4;
  90
  91         hw->io_ports.ctl_addr = ctl;
  92         hw->io_ports.irq_addr = irq_port;
  93
  94         hw->irq = IRQ_AMIGA_PORTS;
  95 }
  96
  97 static const struct ide_port_ops gayle_a4000_port_ops = {
  98         .test_irq               = gayle_test_irq,
  99 };
 100
 101 static const struct ide_port_ops gayle_a1200_port_ops = {
 102         .clear_irq              = gayle_a1200_clear_irq,
 103         .test_irq               = gayle_test_irq,
 104 };
 105
 106 static const struct ide_port_info gayle_port_info = {
 107         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
 108                                   IDE_HFLAG_NO_DMA,
 109         .irq_flags              = IRQF_SHARED,
 110         .chipset                = ide_generic,
 111 };
 112
 113     /*
 114      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
 115      */
 116
 117 static int __init amiga_gayle_ide_probe(struct platform_device *pdev)
 118 {
 119         struct resource *res;
 120         struct gayle_ide_platform_data *pdata;
 121         unsigned long base, ctrlport, irqport;
 122         unsigned int i;
 123         int error;
 124         struct ide_hw hw[GAYLE_NUM_HWIFS], *hws[GAYLE_NUM_HWIFS];
 125         struct ide_port_info d = gayle_port_info;
 126         struct ide_host *host;
 127
 128         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 129         if (!res)
 130                 return -ENODEV;
 131
 132         if (!request_mem_region(res->start, resource_size(res), "IDE"))
 133                 return -EBUSY;
 134
 135         pdata = pdev->dev.platform_data;
 136         pr_info("ide: Gayle IDE controller (A%u style%s)\n",
 137                 pdata->explicit_ack ? 1200 : 4000,
 138                 ide_doubler ? ", IDE doubler" : "");
 139
 140         base = (unsigned long)ZTWO_VADDR(pdata->base);
 141         ctrlport = 0;
 142         irqport = (unsigned long)ZTWO_VADDR(pdata->irqport);
 143         if (pdata->explicit_ack)
 144                 d.port_ops = &gayle_a1200_port_ops;
 145         else
 146                 d.port_ops = &gayle_a4000_port_ops;
 147
 148         for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++, base += GAYLE_NEXT_PORT) {
 149                 if (GAYLE_HAS_CONTROL_REG)
 150                         ctrlport = base + GAYLE_CONTROL;
 151
 152                 gayle_setup_ports(&hw[i], base, ctrlport, irqport);
 153                 hws[i] = &hw[i];
 154         }
 155
 156         error = ide_host_add(&d, hws, i, &host);
 157         if (error)
 158                 goto out;
 159
 160         platform_set_drvdata(pdev, host);
 161         return 0;
 162
 163 out:
 164         release_mem_region(res->start, resource_size(res));
 165         return error;
 166 }
 167
 168 static int __exit amiga_gayle_ide_remove(struct platform_device *pdev)
 169 {
 170         struct ide_host *host = platform_get_drvdata(pdev);
 171         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 172
 173         ide_host_remove(host);
 174         release_mem_region(res->start, resource_size(res));
 175         return 0;
 176 }
 177
 178 static struct platform_driver amiga_gayle_ide_driver = {
 179         .remove = __exit_p(amiga_gayle_ide_remove),
 180         .driver   = {
 181                 .name   = "amiga-gayle-ide",
 182                 .owner  = THIS_MODULE,
 183         },
 184 };
 185
 186 static int __init amiga_gayle_ide_init(void)
 187 {
 188         return platform_driver_probe(&amiga_gayle_ide_driver,
 189                                      amiga_gayle_ide_probe);
 190 }
 191
 192 module_init(amiga_gayle_ide_init);
 193
 194 static void __exit amiga_gayle_ide_exit(void)
 195 {
 196         platform_driver_unregister(&amiga_gayle_ide_driver);
 197 }
 198
 199 module_exit(amiga_gayle_ide_exit);
 200
 201 MODULE_LICENSE("GPL");
 202 MODULE_ALIAS("platform:amiga-gayle-ide");