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     /*
  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      *  Offsets from one of the above bases
  61      */
  62
  63 #define BUDDHA_CONTROL  0x11a
  64
  65     /*
  66      *  Other registers
  67      */
  68
  69 #define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
  70 #define BUDDHA_IRQ2     0xf40           /* interrupt */
  71 #define BUDDHA_IRQ3     0xf80
  72
  73 #define XSURF_IRQ1      0x7e
  74 #define XSURF_IRQ2      0x7e
  75
  76 static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
  77     BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
  78 };
  79
  80 static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
  81     XSURF_IRQ1, XSURF_IRQ2
  82 };
  83
  84 #define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
  85
  86
  87     /*
  88      *  Board information
  89      */
  90
  91 typedef enum BuddhaType_Enum {
  92     BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
  93 } BuddhaType;
  94
  95 static const char *buddha_board_name[] = { "Buddha", "Catweasel", "X-Surf" };
  96
  97     /*
  98      *  Check and acknowledge the interrupt status
  99      */
 100
 101 static int buddha_ack_intr(ide_hwif_t *hwif)
 102 {
 103     unsigned char ch;
 104
 105     ch = z_readb(hwif->io_ports.irq_addr);
 106     if (!(ch & 0x80))
 107             return 0;
 108     return 1;
 109 }
 110
 111 static int xsurf_ack_intr(ide_hwif_t *hwif)
 112 {
 113     unsigned char ch;
 114
 115     ch = z_readb(hwif->io_ports.irq_addr);
 116     /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
 117     z_writeb(0, hwif->io_ports.irq_addr);
 118     if (!(ch & 0x80))
 119             return 0;
 120     return 1;
 121 }
 122
 123 static void __init buddha_setup_ports(hw_regs_t *hw, unsigned long base,
 124                                       unsigned long ctl, unsigned long irq_port,
 125                                       ide_ack_intr_t *ack_intr)
 126 {
 127         int i;
 128
 129         memset(hw, 0, sizeof(*hw));
 130
 131         hw->io_ports.data_addr = base;
 132
 133         for (i = 1; i < 8; i++)
 134                 hw->io_ports_array[i] = base + 2 + i * 4;
 135
 136         hw->io_ports.ctl_addr = ctl;
 137         hw->io_ports.irq_addr = irq_port;
 138
 139         hw->irq = IRQ_AMIGA_PORTS;
 140         hw->ack_intr = ack_intr;
 141
 142         hw->chipset = ide_generic;
 143 }
 144
 145     /*
 146      *  Probe for a Buddha or Catweasel IDE interface
 147      */
 148
 149 static int __init buddha_init(void)
 150 {
 151         hw_regs_t hw;
 152         ide_hwif_t *hwif;
 153         int i;
 154
 155         struct zorro_dev *z = NULL;
 156         u_long buddha_board = 0;
 157         BuddhaType type;
 158         int buddha_num_hwifs;
 159
 160         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 161                 unsigned long board;
 162                 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 163
 164                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
 165                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
 166                         type=BOARD_BUDDHA;
 167                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
 168                         buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
 169                         type=BOARD_CATWEASEL;
 170                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
 171                         buddha_num_hwifs = XSURF_NUM_HWIFS;
 172                         type=BOARD_XSURF;
 173                 } else
 174                         continue;
 175
 176                 board = z->resource.start;
 177
 178 /*
 179  * FIXME: we now have selectable mmio v/s iomio transports.
 180  */
 181
 182                 if(type != BOARD_XSURF) {
 183                         if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
 184                                 continue;
 185                 } else {
 186                         if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
 187                                 continue;
 188                         if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
 189                                 goto fail_base2;
 190                         if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
 191                                 release_mem_region(board+XSURF_BASE2, 0x1000);
 192 fail_base2:
 193                                 release_mem_region(board+XSURF_BASE1, 0x1000);
 194                                 continue;
 195                         }
 196                 }
 197                 buddha_board = ZTWO_VADDR(board);
 198
 199                 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
 200                 /* X-Surf doesn't have this.  IRQs are always on */
 201                 if (type != BOARD_XSURF)
 202                         z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
 203
 204                 printk(KERN_INFO "ide: %s IDE controller\n",
 205                                  buddha_board_name[type]);
 206
 207                 for (i = 0; i < buddha_num_hwifs; i++) {
 208                         unsigned long base, ctl, irq_port;
 209                         ide_ack_intr_t *ack_intr;
 210
 211                         if (type != BOARD_XSURF) {
 212                                 base = buddha_board + buddha_bases[i];
 213                                 ctl = base + BUDDHA_CONTROL;
 214                                 irq_port = buddha_board + buddha_irqports[i];
 215                                 ack_intr = buddha_ack_intr;
 216                         } else {
 217                                 base = buddha_board + xsurf_bases[i];
 218                                 /* X-Surf has no CS1* (Control/AltStat) */
 219                                 ctl = 0;
 220                                 irq_port = buddha_board + xsurf_irqports[i];
 221                                 ack_intr = xsurf_ack_intr;
 222                         }
 223
 224                         buddha_setup_ports(&hw, base, ctl, irq_port, ack_intr);
 225
 226                         hwif = ide_find_port();
 227                         if (hwif) {
 228                                 u8 index = hwif->index;
 229
 230                                 ide_init_port_hw(hwif, &hw);
 231
 232                                 idx[i] = index;
 233                         }
 234                 }
 235
 236                 ide_device_add(idx, NULL);
 237         }
 238
 239         return 0;
 240 }
 241
 242 module_init(buddha_init);
 243
 244 MODULE_LICENSE("GPL");