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 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
  67
  68
  69     /*
  70      *  Check and acknowledge the interrupt status
  71      */
  72
  73 static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
  74 {
  75     unsigned char ch;
  76
  77     ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
  78     if (!(ch & GAYLE_IRQ_IDE))
  79         return 0;
  80     return 1;
  81 }
  82
  83 static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
  84 {
  85     unsigned char ch;
  86
  87     ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
  88     if (!(ch & GAYLE_IRQ_IDE))
  89         return 0;
  90     (void)z_readb(hwif->io_ports[IDE_STATUS_OFFSET]);
  91     z_writeb(0x7c, hwif->io_ports[IDE_IRQ_OFFSET]);
  92     return 1;
  93 }
  94
  95 static void __init gayle_setup_ports(hw_regs_t *hw, unsigned long base,
  96                                      unsigned long ctl, unsigned long irq_port,
  97                                      ide_ack_intr_t *ack_intr)
  98 {
  99         int i;
 100
 101         memset(hw, 0, sizeof(*hw));
 102
 103         hw->io_ports[IDE_DATA_OFFSET] = base;
 104
 105         for (i = 1; i < 8; i++)
 106                 hw->io_ports[i] = base + 2 + i * 4;
 107
 108         hw->io_ports[IDE_CONTROL_OFFSET] = ctl;
 109         hw->io_ports[IDE_IRQ_OFFSET] = irq_port;
 110
 111         hw->irq = IRQ_AMIGA_PORTS;
 112         hw->ack_intr = ack_intr;
 113 }
 114
 115     /*
 116      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
 117      */
 118
 119 static int __init gayle_init(void)
 120 {
 121     int a4000, i;
 122     u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 123
 124     if (!MACH_IS_AMIGA)
 125         return -ENODEV;
 126
 127     if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
 128         goto found;
 129
 130 #ifdef CONFIG_ZORRO
 131     if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
 132                           NULL))
 133         goto found;
 134 #endif
 135     return -ENODEV;
 136
 137 found:
 138         printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
 139                          a4000 ? 4000 : 1200,
 140 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
 141                          ide_doubler ? ", IDE doubler" :
 142 #endif
 143                          "");
 144
 145     for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
 146         unsigned long base, ctrlport, irqport;
 147         ide_ack_intr_t *ack_intr;
 148         hw_regs_t hw;
 149         ide_hwif_t *hwif;
 150         unsigned long phys_base, res_start, res_n;
 151
 152         if (a4000) {
 153             phys_base = GAYLE_BASE_4000;
 154             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
 155             ack_intr = gayle_ack_intr_a4000;
 156         } else {
 157             phys_base = GAYLE_BASE_1200;
 158             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
 159             ack_intr = gayle_ack_intr_a1200;
 160         }
 161 /*
 162  * FIXME: we now have selectable modes between mmio v/s iomio
 163  */
 164
 165         phys_base += i*GAYLE_NEXT_PORT;
 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             continue;
 172
 173         base = (unsigned long)ZTWO_VADDR(phys_base);
 174         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
 175
 176         gayle_setup_ports(&hw, base, ctrlport, irqport, ack_intr);
 177
 178         hwif = ide_find_port(base);
 179         if (hwif) {
 180             u8 index = hwif->index;
 181
 182             ide_init_port_data(hwif, index);
 183             ide_init_port_hw(hwif, &hw);
 184
 185             hwif->mmio = 1;
 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");