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_MMIO | IDE_HFLAG_SERIALIZE |
 122                                   IDE_HFLAG_NO_DMA,
 123         .irq_flags              = IRQF_SHARED,
 124 };
 125
 126     /*
 127      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
 128      */
 129
 130 static int __init gayle_init(void)
 131 {
 132     unsigned long phys_base, res_start, res_n;
 133     unsigned long base, ctrlport, irqport;
 134     ide_ack_intr_t *ack_intr;
 135     int a4000, i, rc;
 136     hw_regs_t hw[GAYLE_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL };
 137
 138     if (!MACH_IS_AMIGA)
 139         return -ENODEV;
 140
 141     if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
 142         goto found;
 143
 144 #ifdef CONFIG_ZORRO
 145     if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
 146                           NULL))
 147         goto found;
 148 #endif
 149     return -ENODEV;
 150
 151 found:
 152         printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
 153                          a4000 ? 4000 : 1200,
 154 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
 155                          ide_doubler ? ", IDE doubler" :
 156 #endif
 157                          "");
 158
 159         if (a4000) {
 160             phys_base = GAYLE_BASE_4000;
 161             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
 162             ack_intr = gayle_ack_intr_a4000;
 163         } else {
 164             phys_base = GAYLE_BASE_1200;
 165             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
 166             ack_intr = gayle_ack_intr_a1200;
 167         }
 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                 return -EBUSY;
 174
 175     for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
 176         base = (unsigned long)ZTWO_VADDR(phys_base + i * GAYLE_NEXT_PORT);
 177         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
 178
 179         gayle_setup_ports(&hw[i], base, ctrlport, irqport, ack_intr);
 180
 181         hws[i] = &hw[i];
 182     }
 183
 184     rc = ide_host_add(&gayle_port_info, hws, NULL);
 185     if (rc)
 186         release_mem_region(res_start, res_n);
 187
 188     return rc;
 189 }
 190
 191 module_init(gayle_init);
 192
 193 MODULE_LICENSE("GPL");