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 #define GAYLE_NUM_HWIFS         2
  57 #define GAYLE_NUM_PROBE_HWIFS   (ide_doubler ? GAYLE_NUM_HWIFS : \
  58                                                GAYLE_NUM_HWIFS-1)
  59 #define GAYLE_HAS_CONTROL_REG   (!ide_doubler)
  60
  61 static int ide_doubler;
  62 module_param_named(doubler, ide_doubler, bool, 0);
  63 MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
  64
  65     /*
  66      *  Check and acknowledge the interrupt status
  67      */
  68
  69 static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
  70 {
  71     unsigned char ch;
  72
  73     ch = z_readb(hwif->io_ports.irq_addr);
  74     if (!(ch & GAYLE_IRQ_IDE))
  75         return 0;
  76     return 1;
  77 }
  78
  79 static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
  80 {
  81     unsigned char ch;
  82
  83     ch = z_readb(hwif->io_ports.irq_addr);
  84     if (!(ch & GAYLE_IRQ_IDE))
  85         return 0;
  86     (void)z_readb(hwif->io_ports.status_addr);
  87     z_writeb(0x7c, hwif->io_ports.irq_addr);
  88     return 1;
  89 }
  90
  91 static void __init gayle_setup_ports(hw_regs_t *hw, unsigned long base,
  92                                      unsigned long ctl, unsigned long irq_port,
  93                                      ide_ack_intr_t *ack_intr)
  94 {
  95         int i;
  96
  97         memset(hw, 0, sizeof(*hw));
  98
  99         hw->io_ports.data_addr = base;
 100
 101         for (i = 1; i < 8; i++)
 102                 hw->io_ports_array[i] = base + 2 + i * 4;
 103
 104         hw->io_ports.ctl_addr = ctl;
 105         hw->io_ports.irq_addr = irq_port;
 106
 107         hw->irq = IRQ_AMIGA_PORTS;
 108         hw->ack_intr = ack_intr;
 109
 110         hw->chipset = ide_generic;
 111 }
 112
 113 static const struct ide_port_info gayle_port_info = {
 114         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
 115                                   IDE_HFLAG_NO_DMA,
 116         .irq_flags              = IRQF_SHARED,
 117 };
 118
 119     /*
 120      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
 121      */
 122
 123 static int __init gayle_init(void)
 124 {
 125     unsigned long phys_base, res_start, res_n;
 126     unsigned long base, ctrlport, irqport;
 127     ide_ack_intr_t *ack_intr;
 128     int a4000, i, rc;
 129     hw_regs_t hw[GAYLE_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL };
 130
 131     if (!MACH_IS_AMIGA)
 132         return -ENODEV;
 133
 134     if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
 135         goto found;
 136
 137 #ifdef CONFIG_ZORRO
 138     if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
 139                           NULL))
 140         goto found;
 141 #endif
 142     return -ENODEV;
 143
 144 found:
 145         printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
 146                          a4000 ? 4000 : 1200,
 147                          ide_doubler ? ", IDE doubler" : "");
 148
 149         if (a4000) {
 150             phys_base = GAYLE_BASE_4000;
 151             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
 152             ack_intr = gayle_ack_intr_a4000;
 153         } else {
 154             phys_base = GAYLE_BASE_1200;
 155             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
 156             ack_intr = gayle_ack_intr_a1200;
 157         }
 158
 159         res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
 160         res_n = GAYLE_IDEREG_SIZE;
 161
 162         if (!request_mem_region(res_start, res_n, "IDE"))
 163                 return -EBUSY;
 164
 165     for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
 166         base = (unsigned long)ZTWO_VADDR(phys_base + i * GAYLE_NEXT_PORT);
 167         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
 168
 169         gayle_setup_ports(&hw[i], base, ctrlport, irqport, ack_intr);
 170
 171         hws[i] = &hw[i];
 172     }
 173
 174     rc = ide_host_add(&gayle_port_info, hws, NULL);
 175     if (rc)
 176         release_mem_region(res_start, res_n);
 177
 178     return rc;
 179 }
 180
 181 module_init(gayle_init);
 182
 183 MODULE_LICENSE("GPL");