drivers/ide/legacy/gayle.c

   1 /*
   2  *  linux/drivers/ide/legacy/gayle.c -- 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/config.h>
  12 #include <linux/types.h>
  13 #include <linux/mm.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/hdreg.h>
  17 #include <linux/ide.h>
  18 #include <linux/init.h>
  19 #include <linux/zorro.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_DATA      0x00
  39 #define GAYLE_ERROR     0x06            /* see err-bits */
  40 #define GAYLE_NSECTOR   0x0a            /* nr of sectors to read/write */
  41 #define GAYLE_SECTOR    0x0e            /* starting sector */
  42 #define GAYLE_LCYL      0x12            /* starting cylinder */
  43 #define GAYLE_HCYL      0x16            /* high byte of starting cyl */
  44 #define GAYLE_SELECT    0x1a            /* 101dhhhh , d=drive, hhhh=head */
  45 #define GAYLE_STATUS    0x1e            /* see status-bits */
  46 #define GAYLE_CONTROL   0x101a
  47
  48 static int gayle_offsets[IDE_NR_PORTS] __initdata = {
  49     GAYLE_DATA, GAYLE_ERROR, GAYLE_NSECTOR, GAYLE_SECTOR, GAYLE_LCYL,
  50     GAYLE_HCYL, GAYLE_SELECT, GAYLE_STATUS, -1, -1
  51 };
  52
  53
  54     /*
  55      *  These are at different offsets from the base
  56      */
  57
  58 #define GAYLE_IRQ_4000  0xdd3020        /* MSB = 1, Harddisk is source of */
  59 #define GAYLE_IRQ_1200  0xda9000        /* interrupt */
  60
  61
  62     /*
  63      *  Offset of the secondary port for IDE doublers
  64      *  Note that GAYLE_CONTROL is NOT available then!
  65      */
  66
  67 #define GAYLE_NEXT_PORT 0x1000
  68
  69 #ifndef CONFIG_BLK_DEV_IDEDOUBLER
  70 #define GAYLE_NUM_HWIFS         1
  71 #define GAYLE_NUM_PROBE_HWIFS   GAYLE_NUM_HWIFS
  72 #define GAYLE_HAS_CONTROL_REG   1
  73 #define GAYLE_IDEREG_SIZE       0x2000
  74 #else /* CONFIG_BLK_DEV_IDEDOUBLER */
  75 #define GAYLE_NUM_HWIFS         2
  76 #define GAYLE_NUM_PROBE_HWIFS   (ide_doubler ? GAYLE_NUM_HWIFS : \
  77                                                GAYLE_NUM_HWIFS-1)
  78 #define GAYLE_HAS_CONTROL_REG   (!ide_doubler)
  79 #define GAYLE_IDEREG_SIZE       (ide_doubler ? 0x1000 : 0x2000)
  80 int ide_doubler = 0;    /* support IDE doublers? */
  81 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
  82
  83
  84     /*
  85      *  Check and acknowledge the interrupt status
  86      */
  87
  88 static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
  89 {
  90     unsigned char ch;
  91
  92     ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
  93     if (!(ch & GAYLE_IRQ_IDE))
  94         return 0;
  95     return 1;
  96 }
  97
  98 static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
  99 {
 100     unsigned char ch;
 101
 102     ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
 103     if (!(ch & GAYLE_IRQ_IDE))
 104         return 0;
 105     (void)z_readb(hwif->io_ports[IDE_STATUS_OFFSET]);
 106     z_writeb(0x7c, hwif->io_ports[IDE_IRQ_OFFSET]);
 107     return 1;
 108 }
 109
 110     /*
 111      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
 112      */
 113
 114 void __init gayle_init(void)
 115 {
 116     int a4000, i;
 117
 118     if (!MACH_IS_AMIGA)
 119         return;
 120
 121     if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
 122         goto found;
 123
 124 #ifdef CONFIG_ZORRO
 125     if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
 126                           NULL))
 127         goto found;
 128 #endif
 129     return;
 130
 131 found:
 132     for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
 133         unsigned long base, ctrlport, irqport;
 134         ide_ack_intr_t *ack_intr;
 135         hw_regs_t hw;
 136         ide_hwif_t *hwif;
 137         int index;
 138         unsigned long phys_base, res_start, res_n;
 139
 140         if (a4000) {
 141             phys_base = GAYLE_BASE_4000;
 142             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
 143             ack_intr = gayle_ack_intr_a4000;
 144         } else {
 145             phys_base = GAYLE_BASE_1200;
 146             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
 147             ack_intr = gayle_ack_intr_a1200;
 148         }
 149 /*
 150  * FIXME: we now have selectable modes between mmio v/s iomio
 151  */
 152
 153         phys_base += i*GAYLE_NEXT_PORT;
 154
 155         res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
 156         res_n = GAYLE_IDEREG_SIZE;
 157
 158         if (!request_mem_region(res_start, res_n, "IDE"))
 159             continue;
 160
 161         base = (unsigned long)ZTWO_VADDR(phys_base);
 162         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
 163
 164         ide_setup_ports(&hw, base, gayle_offsets,
 165                         ctrlport, irqport, ack_intr,
 166 //                      &gayle_iops,
 167                         IRQ_AMIGA_PORTS);
 168
 169         index = ide_register_hw(&hw, &hwif);
 170         if (index != -1) {
 171             hwif->mmio = 2;
 172             switch (i) {
 173                 case 0:
 174                     printk("ide%d: Gayle IDE interface (A%d style)\n", index,
 175                            a4000 ? 4000 : 1200);
 176                     break;
 177 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
 178                 case 1:
 179                     printk("ide%d: IDE doubler\n", index);
 180                     break;
 181 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
 182             }
 183         } else
 184             release_mem_region(res_start, res_n);
 185     }
 186 }