drivers/ide/legacy/buddha.c

   1 /*
   2  *  linux/drivers/ide/buddha.c -- 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     /*
  41      *  Bases of the IDE interfaces (relative to the board address)
  42      */
  43
  44 #define BUDDHA_BASE1    0x800
  45 #define BUDDHA_BASE2    0xa00
  46 #define BUDDHA_BASE3    0xc00
  47
  48 #define XSURF_BASE1     0xb000 /* 2.5" Interface */
  49 #define XSURF_BASE2     0xd000 /* 3.5" Interface */
  50
  51 static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
  52     BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
  53 };
  54
  55 static u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = {
  56      XSURF_BASE1, XSURF_BASE2
  57 };
  58
  59
  60     /*
  61      *  Offsets from one of the above bases
  62      */
  63
  64 #define BUDDHA_DATA     0x00
  65 #define BUDDHA_ERROR    0x06            /* see err-bits */
  66 #define BUDDHA_NSECTOR  0x0a            /* nr of sectors to read/write */
  67 #define BUDDHA_SECTOR   0x0e            /* starting sector */
  68 #define BUDDHA_LCYL     0x12            /* starting cylinder */
  69 #define BUDDHA_HCYL     0x16            /* high byte of starting cyl */
  70 #define BUDDHA_SELECT   0x1a            /* 101dhhhh , d=drive, hhhh=head */
  71 #define BUDDHA_STATUS   0x1e            /* see status-bits */
  72 #define BUDDHA_CONTROL  0x11a
  73 #define XSURF_CONTROL   -1              /* X-Surf has no CS1* (Control/AltStat) */
  74
  75 static int buddha_offsets[IDE_NR_PORTS] __initdata = {
  76     BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
  77     BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, BUDDHA_CONTROL, -1
  78 };
  79
  80 static int xsurf_offsets[IDE_NR_PORTS] __initdata = {
  81     BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
  82     BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, XSURF_CONTROL, -1
  83 };
  84
  85     /*
  86      *  Other registers
  87      */
  88
  89 #define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
  90 #define BUDDHA_IRQ2     0xf40           /* interrupt */
  91 #define BUDDHA_IRQ3     0xf80
  92
  93 #define XSURF_IRQ1      0x7e
  94 #define XSURF_IRQ2      0x7e
  95
  96 static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
  97     BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
  98 };
  99
 100 static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
 101     XSURF_IRQ1, XSURF_IRQ2
 102 };
 103
 104 #define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
 105
 106
 107     /*
 108      *  Board information
 109      */
 110
 111 typedef enum BuddhaType_Enum {
 112     BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
 113 } BuddhaType;
 114
 115
 116     /*
 117      *  Check and acknowledge the interrupt status
 118      */
 119
 120 static int buddha_ack_intr(ide_hwif_t *hwif)
 121 {
 122     unsigned char ch;
 123
 124     ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
 125     if (!(ch & 0x80))
 126             return 0;
 127     return 1;
 128 }
 129
 130 static int xsurf_ack_intr(ide_hwif_t *hwif)
 131 {
 132     unsigned char ch;
 133
 134     ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
 135     /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
 136     z_writeb(0, hwif->io_ports[IDE_IRQ_OFFSET]);
 137     if (!(ch & 0x80))
 138             return 0;
 139     return 1;
 140 }
 141
 142     /*
 143      *  Probe for a Buddha or Catweasel IDE interface
 144      */
 145
 146 void __init buddha_init(void)
 147 {
 148         hw_regs_t hw;
 149         int i, index;
 150
 151         struct zorro_dev *z = NULL;
 152         u_long buddha_board = 0;
 153         BuddhaType type;
 154         int buddha_num_hwifs;
 155
 156         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 157                 unsigned long board;
 158                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
 159                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
 160                         type=BOARD_BUDDHA;
 161                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
 162                         buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
 163                         type=BOARD_CATWEASEL;
 164                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
 165                         buddha_num_hwifs = XSURF_NUM_HWIFS;
 166                         type=BOARD_XSURF;
 167                 } else
 168                         continue;
 169
 170                 board = z->resource.start;
 171
 172 /*
 173  * FIXME: we now have selectable mmio v/s iomio transports.
 174  */
 175
 176                 if(type != BOARD_XSURF) {
 177                         if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
 178                                 continue;
 179                 } else {
 180                         if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
 181                                 continue;
 182                         if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
 183                                 goto fail_base2;
 184                         if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
 185                                 release_mem_region(board+XSURF_BASE2, 0x1000);
 186 fail_base2:
 187                                 release_mem_region(board+XSURF_BASE1, 0x1000);
 188                                 continue;
 189                         }
 190                 }
 191                 buddha_board = ZTWO_VADDR(board);
 192
 193                 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
 194                 /* X-Surf doesn't have this.  IRQs are always on */
 195                 if (type != BOARD_XSURF)
 196                         z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
 197
 198                 for(i=0;i<buddha_num_hwifs;i++) {
 199                         if(type != BOARD_XSURF) {
 200                                 ide_setup_ports(&hw, (ide_ioreg_t)(buddha_board+buddha_bases[i]),
 201                                                 buddha_offsets, 0,
 202                                                 (ide_ioreg_t)(buddha_board+buddha_irqports[i]),
 203                                                 buddha_ack_intr,
 204 //                                              budda_iops,
 205                                                 IRQ_AMIGA_PORTS);
 206                         } else {
 207                                 ide_setup_ports(&hw, (ide_ioreg_t)(buddha_board+xsurf_bases[i]),
 208                                                 xsurf_offsets, 0,
 209                                                 (ide_ioreg_t)(buddha_board+xsurf_irqports[i]),
 210                                                 xsurf_ack_intr,
 211 //                                              xsurf_iops,
 212                                                 IRQ_AMIGA_PORTS);
 213                         }
 214
 215                         index = ide_register_hw(&hw, NULL);
 216                         if (index != -1) {
 217                                 printk("ide%d: ", index);
 218                                 switch(type) {
 219                                 case BOARD_BUDDHA:
 220                                         printk("Buddha");
 221                                         break;
 222                                 case BOARD_CATWEASEL:
 223                                         printk("Catweasel");
 224                                         break;
 225                                 case BOARD_XSURF:
 226                                         printk("X-Surf");
 227                                         break;
 228                                 }
 229                                 printk(" IDE interface\n");
 230                         }
 231                 }
 232         }
 233 }