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