LXR linux/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
  53static bool ide_doubler;
  54module_param_named(doubler, ide_doubler, bool, 0);
  55MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
  56
  57    /*
  58     *  Check and acknowledge the interrupt status
  59     */
  60
  61static 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
  71static 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
  79static 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
  97static const struct ide_port_ops gayle_a4000_port_ops = {
  98        .test_irq               = gayle_test_irq,
  99};
 100
 101static const struct ide_port_ops gayle_a1200_port_ops = {
 102        .clear_irq              = gayle_a1200_clear_irq,
 103        .test_irq               = gayle_test_irq,
 104};
 105
 106static 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
 117static 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 = dev_get_platdata(&pdev->dev);
 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
 163out:
 164        release_mem_region(res->start, resource_size(res));
 165        return error;
 166}
 167
 168static 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
 178static 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
 186module_platform_driver_probe(amiga_gayle_ide_driver, amiga_gayle_ide_probe);
 187
 188MODULE_LICENSE("GPL");
 189MODULE_ALIAS("platform:amiga-gayle-ide");
 190