drivers/ide/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/ide.h>
  16 #include <linux/init.h>
  17 #include <linux/zorro.h>
  18 #include <linux/module.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 #define GAYLE_IDEREG_SIZE       0x2000
  34
  35     /*
  36      *  Offsets from one of the above bases
  37      */
  38
  39 #define GAYLE_CONTROL   0x101a
  40
  41     /*
  42      *  These are at different offsets from the base
  43      */
  44
  45 #define GAYLE_IRQ_4000  0xdd3020        /* MSB = 1, Harddisk is source of */
  46 #define GAYLE_IRQ_1200  0xda9000        /* interrupt */
  47
  48
  49     /*
  50      *  Offset of the secondary port for IDE doublers
  51      *  Note that GAYLE_CONTROL is NOT available then!
  52      */
  53
  54 #define GAYLE_NEXT_PORT 0x1000
  55
  56 #ifndef CONFIG_BLK_DEV_IDEDOUBLER
  57 #define GAYLE_NUM_HWIFS         1
  58 #define GAYLE_NUM_PROBE_HWIFS   GAYLE_NUM_HWIFS
  59 #define GAYLE_HAS_CONTROL_REG   1
  60 #else /* CONFIG_BLK_DEV_IDEDOUBLER */
  61 #define GAYLE_NUM_HWIFS         2
  62 #define GAYLE_NUM_PROBE_HWIFS   (ide_doubler ? GAYLE_NUM_HWIFS : \
  63                                                GAYLE_NUM_HWIFS-1)
  64 #define GAYLE_HAS_CONTROL_REG   (!ide_doubler)
  65
  66 static int ide_doubler;
  67 module_param_named(doubler, ide_doubler, bool, 0);
  68 MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
  69 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
  70
  71
  72     /*
  73      *  Check and acknowledge the interrupt status
  74      */
  75
  76 static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
  77 {
  78     unsigned char ch;
  79
  80     ch = z_readb(hwif->io_ports.irq_addr);
  81     if (!(ch & GAYLE_IRQ_IDE))
  82         return 0;
  83     return 1;
  84 }
  85
  86 static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
  87 {
  88     unsigned char ch;
  89
  90     ch = z_readb(hwif->io_ports.irq_addr);
  91     if (!(ch & GAYLE_IRQ_IDE))
  92         return 0;
  93     (void)z_readb(hwif->io_ports.status_addr);
  94     z_writeb(0x7c, hwif->io_ports.irq_addr);
  95     return 1;
  96 }
  97
  98 static void __init gayle_setup_ports(hw_regs_t *hw, unsigned long base,
  99                                      unsigned long ctl, unsigned long irq_port,
 100                                      ide_ack_intr_t *ack_intr)
 101 {
 102         int i;
 103
 104         memset(hw, 0, sizeof(*hw));
 105
 106         hw->io_ports.data_addr = base;
 107
 108         for (i = 1; i < 8; i++)
 109                 hw->io_ports_array[i] = base + 2 + i * 4;
 110
 111         hw->io_ports.ctl_addr = ctl;
 112         hw->io_ports.irq_addr = irq_port;
 113
 114         hw->irq = IRQ_AMIGA_PORTS;
 115         hw->ack_intr = ack_intr;
 116
 117         hw->chipset = ide_generic;
 118 }
 119
 120 static const struct ide_port_info gayle_port_info = {
 121         .host_flags             = IDE_HFLAG_SERIALIZE | IDE_HFLAG_NO_DMA,
 122 };
 123
 124     /*
 125      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
 126      */
 127
 128 static int __init gayle_init(void)
 129 {
 130     unsigned long phys_base, res_start, res_n;
 131     unsigned long base, ctrlport, irqport;
 132     ide_ack_intr_t *ack_intr;
 133     int a4000, i, rc;
 134     hw_regs_t hw[GAYLE_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL };
 135
 136     if (!MACH_IS_AMIGA)
 137         return -ENODEV;
 138
 139     if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
 140         goto found;
 141
 142 #ifdef CONFIG_ZORRO
 143     if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
 144                           NULL))
 145         goto found;
 146 #endif
 147     return -ENODEV;
 148
 149 found:
 150         printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
 151                          a4000 ? 4000 : 1200,
 152 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
 153                          ide_doubler ? ", IDE doubler" :
 154 #endif
 155                          "");
 156
 157         if (a4000) {
 158             phys_base = GAYLE_BASE_4000;
 159             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
 160             ack_intr = gayle_ack_intr_a4000;
 161         } else {
 162             phys_base = GAYLE_BASE_1200;
 163             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
 164             ack_intr = gayle_ack_intr_a1200;
 165         }
 166 /*
 167  * FIXME: we now have selectable modes between mmio v/s iomio
 168  */
 169
 170         res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
 171         res_n = GAYLE_IDEREG_SIZE;
 172
 173         if (!request_mem_region(res_start, res_n, "IDE"))
 174                 return -EBUSY;
 175
 176     for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
 177         base = (unsigned long)ZTWO_VADDR(phys_base + i * GAYLE_NEXT_PORT);
 178         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
 179
 180         gayle_setup_ports(&hw[i], base, ctrlport, irqport, ack_intr);
 181
 182         hws[i] = &hw[i];
 183     }
 184
 185     rc = ide_host_add(&gayle_port_info, hws, NULL);
 186     if (rc)
 187         release_mem_region(res_start, res_n);
 188
 189     return rc;
 190 }
 191
 192 module_init(gayle_init);
 193
 194 MODULE_LICENSE("GPL");