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