drivers/ide/legacy/buddha.c

   1 /*
   2  *  Amiga Buddha, Catweasel and X-Surf IDE Driver
   3  *
   4  *      Copyright (C) 1997, 2001 by Geert Uytterhoeven and others
   5  *
   6  *  This driver was written based on the specifications in README.buddha and
   7  *  the X-Surf info from Inside_XSurf.txt available at
   8  *  http://www.jschoenfeld.com
   9  *
  10  *  This file is subject to the terms and conditions of the GNU General Public
  11  *  License.  See the file COPYING in the main directory of this archive for
  12  *  more details.
  13  *
  14  *  TODO:
  15  *    - test it :-)
  16  *    - tune the timings using the speed-register
  17  */
  18
  19 #include <linux/types.h>
  20 #include <linux/mm.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/hdreg.h>
  24 #include <linux/zorro.h>
  25 #include <linux/ide.h>
  26 #include <linux/init.h>
  27
  28 #include <asm/amigahw.h>
  29 #include <asm/amigaints.h>
  30
  31
  32     /*
  33      *  The Buddha has 2 IDE interfaces, the Catweasel has 3, X-Surf has 2
  34      */
  35
  36 #define BUDDHA_NUM_HWIFS        2
  37 #define CATWEASEL_NUM_HWIFS     3
  38 #define XSURF_NUM_HWIFS         2
  39
  40 #define MAX_NUM_HWIFS           3
  41
  42     /*
  43      *  Bases of the IDE interfaces (relative to the board address)
  44      */
  45
  46 #define BUDDHA_BASE1    0x800
  47 #define BUDDHA_BASE2    0xa00
  48 #define BUDDHA_BASE3    0xc00
  49
  50 #define XSURF_BASE1     0xb000 /* 2.5" Interface */
  51 #define XSURF_BASE2     0xd000 /* 3.5" Interface */
  52
  53 static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
  54     BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
  55 };
  56
  57 static u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = {
  58      XSURF_BASE1, XSURF_BASE2
  59 };
  60
  61     /*
  62      *  Offsets from one of the above bases
  63      */
  64
  65 #define BUDDHA_CONTROL  0x11a
  66
  67     /*
  68      *  Other registers
  69      */
  70
  71 #define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
  72 #define BUDDHA_IRQ2     0xf40           /* interrupt */
  73 #define BUDDHA_IRQ3     0xf80
  74
  75 #define XSURF_IRQ1      0x7e
  76 #define XSURF_IRQ2      0x7e
  77
  78 static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
  79     BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
  80 };
  81
  82 static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
  83     XSURF_IRQ1, XSURF_IRQ2
  84 };
  85
  86 #define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
  87
  88
  89     /*
  90      *  Board information
  91      */
  92
  93 typedef enum BuddhaType_Enum {
  94     BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
  95 } BuddhaType;
  96
  97 static const char *buddha_board_name[] = { "Buddha", "Catweasel", "X-Surf" };
  98
  99     /*
 100      *  Check and acknowledge the interrupt status
 101      */
 102
 103 static int buddha_ack_intr(ide_hwif_t *hwif)
 104 {
 105     unsigned char ch;
 106
 107     ch = z_readb(hwif->io_ports.irq_addr);
 108     if (!(ch & 0x80))
 109             return 0;
 110     return 1;
 111 }
 112
 113 static int xsurf_ack_intr(ide_hwif_t *hwif)
 114 {
 115     unsigned char ch;
 116
 117     ch = z_readb(hwif->io_ports.irq_addr);
 118     /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
 119     z_writeb(0, hwif->io_ports.irq_addr);
 120     if (!(ch & 0x80))
 121             return 0;
 122     return 1;
 123 }
 124
 125 static void __init buddha_setup_ports(hw_regs_t *hw, unsigned long base,
 126                                       unsigned long ctl, unsigned long irq_port,
 127                                       ide_ack_intr_t *ack_intr)
 128 {
 129         int i;
 130
 131         memset(hw, 0, sizeof(*hw));
 132
 133         hw->io_ports.data_addr = base;
 134
 135         for (i = 1; i < 8; i++)
 136                 hw->io_ports_array[i] = base + 2 + i * 4;
 137
 138         hw->io_ports.ctl_addr = ctl;
 139         hw->io_ports.irq_addr = irq_port;
 140
 141         hw->irq = IRQ_AMIGA_PORTS;
 142         hw->ack_intr = ack_intr;
 143
 144         hw->chipset = ide_generic;
 145 }
 146
 147     /*
 148      *  Probe for a Buddha or Catweasel IDE interface
 149      */
 150
 151 static int __init buddha_init(void)
 152 {
 153         ide_hwif_t *hwif;
 154         int i;
 155
 156         struct zorro_dev *z = NULL;
 157         u_long buddha_board = 0;
 158         BuddhaType type;
 159         int buddha_num_hwifs;
 160
 161         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 162                 unsigned long board;
 163                 hw_regs_t hw[MAX_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL };
 164                 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 165
 166                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
 167                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
 168                         type=BOARD_BUDDHA;
 169                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
 170                         buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
 171                         type=BOARD_CATWEASEL;
 172                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
 173                         buddha_num_hwifs = XSURF_NUM_HWIFS;
 174                         type=BOARD_XSURF;
 175                 } else
 176                         continue;
 177
 178                 board = z->resource.start;
 179
 180 /*
 181  * FIXME: we now have selectable mmio v/s iomio transports.
 182  */
 183
 184                 if(type != BOARD_XSURF) {
 185                         if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
 186                                 continue;
 187                 } else {
 188                         if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
 189                                 continue;
 190                         if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
 191                                 goto fail_base2;
 192                         if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
 193                                 release_mem_region(board+XSURF_BASE2, 0x1000);
 194 fail_base2:
 195                                 release_mem_region(board+XSURF_BASE1, 0x1000);
 196                                 continue;
 197                         }
 198                 }
 199                 buddha_board = ZTWO_VADDR(board);
 200
 201                 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
 202                 /* X-Surf doesn't have this.  IRQs are always on */
 203                 if (type != BOARD_XSURF)
 204                         z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
 205
 206                 printk(KERN_INFO "ide: %s IDE controller\n",
 207                                  buddha_board_name[type]);
 208
 209                 for (i = 0; i < buddha_num_hwifs; i++) {
 210                         unsigned long base, ctl, irq_port;
 211                         ide_ack_intr_t *ack_intr;
 212
 213                         if (type != BOARD_XSURF) {
 214                                 base = buddha_board + buddha_bases[i];
 215                                 ctl = base + BUDDHA_CONTROL;
 216                                 irq_port = buddha_board + buddha_irqports[i];
 217                                 ack_intr = buddha_ack_intr;
 218                         } else {
 219                                 base = buddha_board + xsurf_bases[i];
 220                                 /* X-Surf has no CS1* (Control/AltStat) */
 221                                 ctl = 0;
 222                                 irq_port = buddha_board + xsurf_irqports[i];
 223                                 ack_intr = xsurf_ack_intr;
 224                         }
 225
 226                         buddha_setup_ports(&hw[i], base, ctl, irq_port,
 227                                            ack_intr);
 228
 229                         hwif = ide_find_port();
 230                         if (hwif) {
 231                                 hwif->chipset = ide_generic;
 232
 233                                 hws[i] = &hw[i];
 234                                 idx[i] = hwif->index;
 235                         }
 236                 }
 237
 238                 ide_device_add(idx, NULL, hws);
 239         }
 240
 241         return 0;
 242 }
 243
 244 module_init(buddha_init);
 245
 246 MODULE_LICENSE("GPL");