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