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 #include <linux/module.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_test_irq(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 void xsurf_clear_irq(ide_drive_t *drive)
 114 {
 115     /*
 116      * X-Surf needs 0 written to IRQ register to ensure ISA bit A11 stays at 0
 117      */
 118     z_writeb(0, drive->hwif->io_ports.irq_addr);
 119 }
 120
 121 static void __init buddha_setup_ports(struct ide_hw *hw, unsigned long base,
 122                                       unsigned long ctl, unsigned long irq_port)
 123 {
 124         int i;
 125
 126         memset(hw, 0, sizeof(*hw));
 127
 128         hw->io_ports.data_addr = base;
 129
 130         for (i = 1; i < 8; i++)
 131                 hw->io_ports_array[i] = base + 2 + i * 4;
 132
 133         hw->io_ports.ctl_addr = ctl;
 134         hw->io_ports.irq_addr = irq_port;
 135
 136         hw->irq = IRQ_AMIGA_PORTS;
 137 }
 138
 139 static const struct ide_port_ops buddha_port_ops = {
 140         .test_irq               = buddha_test_irq,
 141 };
 142
 143 static const struct ide_port_ops xsurf_port_ops = {
 144         .clear_irq              = xsurf_clear_irq,
 145         .test_irq               = buddha_test_irq,
 146 };
 147
 148 static const struct ide_port_info buddha_port_info = {
 149         .port_ops               = &buddha_port_ops,
 150         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 151         .irq_flags              = IRQF_SHARED,
 152         .chipset                = ide_generic,
 153 };
 154
 155     /*
 156      *  Probe for a Buddha or Catweasel IDE interface
 157      */
 158
 159 static int __init buddha_init(void)
 160 {
 161         struct zorro_dev *z = NULL;
 162         u_long buddha_board = 0;
 163         BuddhaType type;
 164         int buddha_num_hwifs, i;
 165
 166         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 167                 unsigned long board;
 168                 struct ide_hw hw[MAX_NUM_HWIFS], *hws[MAX_NUM_HWIFS];
 169                 struct ide_port_info d = buddha_port_info;
 170
 171                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
 172                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
 173                         type=BOARD_BUDDHA;
 174                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
 175                         buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
 176                         type=BOARD_CATWEASEL;
 177                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
 178                         buddha_num_hwifs = XSURF_NUM_HWIFS;
 179                         type=BOARD_XSURF;
 180                         d.port_ops = &xsurf_port_ops;
 181                 } else
 182                         continue;
 183
 184                 board = z->resource.start;
 185
 186                 if(type != BOARD_XSURF) {
 187                         if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
 188                                 continue;
 189                 } else {
 190                         if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
 191                                 continue;
 192                         if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
 193                                 goto fail_base2;
 194                         if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
 195                                 release_mem_region(board+XSURF_BASE2, 0x1000);
 196 fail_base2:
 197                                 release_mem_region(board+XSURF_BASE1, 0x1000);
 198                                 continue;
 199                         }
 200                 }
 201                 buddha_board = (unsigned long)ZTWO_VADDR(board);
 202
 203                 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
 204                 /* X-Surf doesn't have this.  IRQs are always on */
 205                 if (type != BOARD_XSURF)
 206                         z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
 207
 208                 printk(KERN_INFO "ide: %s IDE controller\n",
 209                                  buddha_board_name[type]);
 210
 211                 for (i = 0; i < buddha_num_hwifs; i++) {
 212                         unsigned long base, ctl, irq_port;
 213
 214                         if (type != BOARD_XSURF) {
 215                                 base = buddha_board + buddha_bases[i];
 216                                 ctl = base + BUDDHA_CONTROL;
 217                                 irq_port = buddha_board + buddha_irqports[i];
 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                         }
 224
 225                         buddha_setup_ports(&hw[i], base, ctl, irq_port);
 226
 227                         hws[i] = &hw[i];
 228                 }
 229
 230                 ide_host_add(&d, hws, i, NULL);
 231         }
 232
 233         return 0;
 234 }
 235
 236 module_init(buddha_init);
 237
 238 MODULE_LICENSE("GPL");