drivers/ide/legacy/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/hdreg.h>
  16 #include <linux/ide.h>
  17 #include <linux/init.h>
  18 #include <linux/zorro.h>
  19 #include <linux/module.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      *  Bases of the IDE interfaces
  29      */
  30
  31 #define GAYLE_BASE_4000 0xdd2020        /* A4000/A4000T */
  32 #define GAYLE_BASE_1200 0xda0000        /* A1200/A600 and E-Matrix 530 */
  33
  34     /*
  35      *  Offsets from one of the above bases
  36      */
  37
  38 #define GAYLE_CONTROL   0x101a
  39
  40     /*
  41      *  These are at different offsets from the base
  42      */
  43
  44 #define GAYLE_IRQ_4000  0xdd3020        /* MSB = 1, Harddisk is source of */
  45 #define GAYLE_IRQ_1200  0xda9000        /* interrupt */
  46
  47
  48     /*
  49      *  Offset of the secondary port for IDE doublers
  50      *  Note that GAYLE_CONTROL is NOT available then!
  51      */
  52
  53 #define GAYLE_NEXT_PORT 0x1000
  54
  55 #ifndef CONFIG_BLK_DEV_IDEDOUBLER
  56 #define GAYLE_NUM_HWIFS         1
  57 #define GAYLE_NUM_PROBE_HWIFS   GAYLE_NUM_HWIFS
  58 #define GAYLE_HAS_CONTROL_REG   1
  59 #define GAYLE_IDEREG_SIZE       0x2000
  60 #else /* CONFIG_BLK_DEV_IDEDOUBLER */
  61 #define GAYLE_NUM_HWIFS         2
  62 #define GAYLE_NUM_PROBE_HWIFS   (ide_doubler ? GAYLE_NUM_HWIFS : \
  63                                                GAYLE_NUM_HWIFS-1)
  64 #define GAYLE_HAS_CONTROL_REG   (!ide_doubler)
  65 #define GAYLE_IDEREG_SIZE       (ide_doubler ? 0x1000 : 0x2000)
  66
  67 int ide_doubler = 0;    /* support IDE doublers? */
  68 EXPORT_SYMBOL_GPL(ide_doubler);
  69
  70 module_param_named(doubler, ide_doubler, bool, 0);
  71 MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
  72 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
  73
  74
  75     /*
  76      *  Check and acknowledge the interrupt status
  77      */
  78
  79 static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
  80 {
  81     unsigned char ch;
  82
  83     ch = z_readb(hwif->io_ports.irq_addr);
  84     if (!(ch & GAYLE_IRQ_IDE))
  85         return 0;
  86     return 1;
  87 }
  88
  89 static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
  90 {
  91     unsigned char ch;
  92
  93     ch = z_readb(hwif->io_ports.irq_addr);
  94     if (!(ch & GAYLE_IRQ_IDE))
  95         return 0;
  96     (void)z_readb(hwif->io_ports.status_addr);
  97     z_writeb(0x7c, hwif->io_ports.irq_addr);
  98     return 1;
  99 }
 100
 101 static void __init gayle_setup_ports(hw_regs_t *hw, unsigned long base,
 102                                      unsigned long ctl, unsigned long irq_port,
 103                                      ide_ack_intr_t *ack_intr)
 104 {
 105         int i;
 106
 107         memset(hw, 0, sizeof(*hw));
 108
 109         hw->io_ports.data_addr = base;
 110
 111         for (i = 1; i < 8; i++)
 112                 hw->io_ports_array[i] = base + 2 + i * 4;
 113
 114         hw->io_ports.ctl_addr = ctl;
 115         hw->io_ports.irq_addr = irq_port;
 116
 117         hw->irq = IRQ_AMIGA_PORTS;
 118         hw->ack_intr = ack_intr;
 119
 120         hw->chipset = ide_generic;
 121 }
 122
 123     /*
 124      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
 125      */
 126
 127 static int __init gayle_init(void)
 128 {
 129     int a4000, i;
 130     u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 131
 132     if (!MACH_IS_AMIGA)
 133         return -ENODEV;
 134
 135     if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
 136         goto found;
 137
 138 #ifdef CONFIG_ZORRO
 139     if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
 140                           NULL))
 141         goto found;
 142 #endif
 143     return -ENODEV;
 144
 145 found:
 146         printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
 147                          a4000 ? 4000 : 1200,
 148 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
 149                          ide_doubler ? ", IDE doubler" :
 150 #endif
 151                          "");
 152
 153     for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
 154         unsigned long base, ctrlport, irqport;
 155         ide_ack_intr_t *ack_intr;
 156         hw_regs_t hw;
 157         ide_hwif_t *hwif;
 158         unsigned long phys_base, res_start, res_n;
 159
 160         if (a4000) {
 161             phys_base = GAYLE_BASE_4000;
 162             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
 163             ack_intr = gayle_ack_intr_a4000;
 164         } else {
 165             phys_base = GAYLE_BASE_1200;
 166             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
 167             ack_intr = gayle_ack_intr_a1200;
 168         }
 169 /*
 170  * FIXME: we now have selectable modes between mmio v/s iomio
 171  */
 172
 173         phys_base += i*GAYLE_NEXT_PORT;
 174
 175         res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
 176         res_n = GAYLE_IDEREG_SIZE;
 177
 178         if (!request_mem_region(res_start, res_n, "IDE"))
 179             continue;
 180
 181         base = (unsigned long)ZTWO_VADDR(phys_base);
 182         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
 183
 184         gayle_setup_ports(&hw, base, ctrlport, irqport, ack_intr);
 185
 186         hwif = ide_find_port();
 187         if (hwif) {
 188             u8 index = hwif->index;
 189
 190             ide_init_port_data(hwif, index);
 191             ide_init_port_hw(hwif, &hw);
 192
 193             idx[i] = index;
 194         } else
 195             release_mem_region(res_start, res_n);
 196     }
 197
 198     ide_device_add(idx, NULL);
 199
 200     return 0;
 201 }
 202
 203 module_init(gayle_init);
 204
 205 MODULE_LICENSE("GPL");