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
  20 #include <asm/setup.h>
  21 #include <asm/amigahw.h>
  22 #include <asm/amigaints.h>
  23 #include <asm/amigayle.h>
  24
  25
  26     /*
  27      *  Bases of the IDE interfaces
  28      */
  29
  30 #define GAYLE_BASE_4000 0xdd2020        /* A4000/A4000T */
  31 #define GAYLE_BASE_1200 0xda0000        /* A1200/A600 and E-Matrix 530 */
  32
  33     /*
  34      *  Offsets from one of the above bases
  35      */
  36
  37 #define GAYLE_CONTROL   0x101a
  38
  39     /*
  40      *  These are at different offsets from the base
  41      */
  42
  43 #define GAYLE_IRQ_4000  0xdd3020        /* MSB = 1, Harddisk is source of */
  44 #define GAYLE_IRQ_1200  0xda9000        /* interrupt */
  45
  46
  47     /*
  48      *  Offset of the secondary port for IDE doublers
  49      *  Note that GAYLE_CONTROL is NOT available then!
  50      */
  51
  52 #define GAYLE_NEXT_PORT 0x1000
  53
  54 #ifndef CONFIG_BLK_DEV_IDEDOUBLER
  55 #define GAYLE_NUM_HWIFS         1
  56 #define GAYLE_NUM_PROBE_HWIFS   GAYLE_NUM_HWIFS
  57 #define GAYLE_HAS_CONTROL_REG   1
  58 #define GAYLE_IDEREG_SIZE       0x2000
  59 #else /* CONFIG_BLK_DEV_IDEDOUBLER */
  60 #define GAYLE_NUM_HWIFS         2
  61 #define GAYLE_NUM_PROBE_HWIFS   (ide_doubler ? GAYLE_NUM_HWIFS : \
  62                                                GAYLE_NUM_HWIFS-1)
  63 #define GAYLE_HAS_CONTROL_REG   (!ide_doubler)
  64 #define GAYLE_IDEREG_SIZE       (ide_doubler ? 0x1000 : 0x2000)
  65 int ide_doubler = 0;    /* support IDE doublers? */
  66 module_param_named(doubler, ide_doubler, bool, 0);
  67 MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
  68 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
  69
  70
  71     /*
  72      *  Check and acknowledge the interrupt status
  73      */
  74
  75 static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
  76 {
  77     unsigned char ch;
  78
  79     ch = z_readb(hwif->io_ports.irq_addr);
  80     if (!(ch & GAYLE_IRQ_IDE))
  81         return 0;
  82     return 1;
  83 }
  84
  85 static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
  86 {
  87     unsigned char ch;
  88
  89     ch = z_readb(hwif->io_ports.irq_addr);
  90     if (!(ch & GAYLE_IRQ_IDE))
  91         return 0;
  92     (void)z_readb(hwif->io_ports.status_addr);
  93     z_writeb(0x7c, hwif->io_ports.irq_addr);
  94     return 1;
  95 }
  96
  97 static void __init gayle_setup_ports(hw_regs_t *hw, unsigned long base,
  98                                      unsigned long ctl, unsigned long irq_port,
  99                                      ide_ack_intr_t *ack_intr)
 100 {
 101         int i;
 102
 103         memset(hw, 0, sizeof(*hw));
 104
 105         hw->io_ports.data_addr = base;
 106
 107         for (i = 1; i < 8; i++)
 108                 hw->io_ports_array[i] = base + 2 + i * 4;
 109
 110         hw->io_ports.ctl_addr = ctl;
 111         hw->io_ports.irq_addr = irq_port;
 112
 113         hw->irq = IRQ_AMIGA_PORTS;
 114         hw->ack_intr = ack_intr;
 115 }
 116
 117     /*
 118      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
 119      */
 120
 121 static int __init gayle_init(void)
 122 {
 123     int a4000, i;
 124     u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 125
 126     if (!MACH_IS_AMIGA)
 127         return -ENODEV;
 128
 129     if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
 130         goto found;
 131
 132 #ifdef CONFIG_ZORRO
 133     if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
 134                           NULL))
 135         goto found;
 136 #endif
 137     return -ENODEV;
 138
 139 found:
 140         printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
 141                          a4000 ? 4000 : 1200,
 142 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
 143                          ide_doubler ? ", IDE doubler" :
 144 #endif
 145                          "");
 146
 147     for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
 148         unsigned long base, ctrlport, irqport;
 149         ide_ack_intr_t *ack_intr;
 150         hw_regs_t hw;
 151         ide_hwif_t *hwif;
 152         unsigned long phys_base, res_start, res_n;
 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         phys_base += i*GAYLE_NEXT_PORT;
 168
 169         res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
 170         res_n = GAYLE_IDEREG_SIZE;
 171
 172         if (!request_mem_region(res_start, res_n, "IDE"))
 173             continue;
 174
 175         base = (unsigned long)ZTWO_VADDR(phys_base);
 176         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
 177
 178         gayle_setup_ports(&hw, base, ctrlport, irqport, ack_intr);
 179
 180         hwif = ide_find_port();
 181         if (hwif) {
 182             u8 index = hwif->index;
 183
 184             ide_init_port_data(hwif, index);
 185             ide_init_port_hw(hwif, &hw);
 186
 187             idx[i] = index;
 188         } else
 189             release_mem_region(res_start, res_n);
 190     }
 191
 192     ide_device_add(idx, NULL);
 193
 194     return 0;
 195 }
 196
 197 module_init(gayle_init);
 198
 199 MODULE_LICENSE("GPL");