drivers/tc/tc.c

   1 /* $Id: tc.c,v 1.3 1999/10/09 00:01:32 ralf Exp $
   2  * tc-init: We assume the TURBOchannel to be up and running so
   3  * just probe for Modules and fill in the global data structure
   4  * tc_bus.
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  *
  10  * Copyright (c) Harald Koerfgen, 1998
  11  *
  12  */
  13
  14 #include <linux/string.h>
  15 #include <linux/init.h>
  16 #include <linux/ioport.h>
  17 #include <asm/addrspace.h>
  18 #include <asm/errno.h>
  19 #include <asm/dec/machtype.h>
  20 #include <asm/dec/tcinfo.h>
  21 #include <asm/dec/tcmodule.h>
  22 #include <asm/dec/interrupts.h>
  23
  24 #include <asm/ptrace.h>
  25 #include <linux/kernel.h>
  26
  27 #define TC_DEBUG
  28
  29 slot_info tc_bus[MAX_SLOT];
  30 static int max_tcslot = 0;
  31 static tcinfo *info = (tcinfo *)0;
  32
  33 unsigned long system_base = 0;
  34
  35 extern void (*dbe_board_handler)(struct pt_regs *regs);
  36 extern unsigned long *(*rex_slot_address)(int);
  37 extern void *(*rex_gettcinfo)(void);
  38
  39 /*
  40  * Interface to the world. Read comment in include/asm-mips/tc.h.
  41  */
  42
  43 int search_tc_card(char *name)
  44 {
  45         int slot;
  46         slot_info *sip;
  47
  48         for (slot = 0; slot <= max_tcslot; slot++) {
  49                 sip = &tc_bus[slot];
  50                 if ((sip->flags & FREE) && (strncmp(sip->name, name, strlen(name)) == 0)) {
  51                         return slot;
  52                 }
  53         }
  54
  55         return -ENODEV;
  56 }
  57
  58 void claim_tc_card(int slot)
  59 {
  60         if (tc_bus[slot].flags & IN_USE) {
  61                 printk("claim_tc_card: attempting to claim a card already in use\n");
  62                 return;
  63         }
  64         tc_bus[slot].flags &= ~FREE;
  65         tc_bus[slot].flags |= IN_USE;
  66 }
  67
  68 void release_tc_card(int slot)
  69 {
  70         if (tc_bus[slot].flags & FREE) {
  71                 printk("release_tc_card: attempting to release a card already free\n");
  72                 return;
  73         }
  74         tc_bus[slot].flags &= ~IN_USE;
  75         tc_bus[slot].flags |= FREE;
  76 }
  77
  78 unsigned long get_tc_base_addr(int slot)
  79 {
  80         return tc_bus[slot].base_addr;
  81 }
  82
  83 unsigned long get_tc_irq_nr(int slot)
  84 {
  85         return tc_bus[slot].interrupt;
  86 }
  87
  88 unsigned long get_tc_speed(void)
  89 {
  90         return 100000 * (10000 / (unsigned long)info->clk_period);
  91 }
  92
  93 /*
  94  * Probing for TURBOchannel modules
  95  */
  96 static void __init my_dbe_handler(struct pt_regs *regs)
  97 {
  98         regs->cp0_epc += 4;
  99 }
 100
 101 static void __init tc_probe(unsigned long startaddr, unsigned long size, int max_slot)
 102 {
 103         int i, slot;
 104         long offset;
 105         unsigned char *module;
 106         void (*old_be_handler)(struct pt_regs *regs);
 107
 108         /* Install our exception handler temporarily */
 109
 110         old_be_handler = dbe_board_handler;
 111         dbe_board_handler = my_dbe_handler;
 112         for (slot = 0; slot <= max_slot; slot++) {
 113                 module = (char *)(startaddr + slot * size);
 114                 offset = -1;
 115                 if (module[OLDCARD + PATTERN0] == 0x55 && module[OLDCARD + PATTERN1] == 0x00
 116                   && module[OLDCARD + PATTERN2] == 0xaa && module[OLDCARD + PATTERN3] == 0xff)
 117                         offset = OLDCARD;
 118                 if (module[PATTERN0] == 0x55 && module[PATTERN1] == 0x00
 119                   && module[PATTERN2] == 0xaa && module[PATTERN3] == 0xff)
 120                         offset = 0;
 121
 122                 if (offset != -1) {
 123                         tc_bus[slot].base_addr = (unsigned long)module;
 124                         for(i = 0; i < 8; i++) {
 125                                 tc_bus[slot].firmware[i] = module[FIRM_VER + offset + 4 * i];
 126                                 tc_bus[slot].vendor[i] = module[VENDOR + offset + 4 * i];
 127                                 tc_bus[slot].name[i] = module[MODULE + offset + 4 * i];
 128                         }
 129                         tc_bus[slot].firmware[8] = 0;
 130                         tc_bus[slot].vendor[8] = 0;
 131                         tc_bus[slot].name[8] = 0;
 132                         /*
 133                          * Looks unneccesary, but we may change
 134                          * TC? in the future
 135                          */
 136                         switch (slot) {
 137                         case 0:
 138                                 tc_bus[slot].interrupt = TC0;
 139                                 break;
 140                         case 1:
 141                                 tc_bus[slot].interrupt = TC1;
 142                                 break;
 143                         case 2:
 144                                 tc_bus[slot].interrupt = TC2;
 145                                 break;
 146                         /*
 147                          * Yuck! DS5000/200 onboard devices
 148                          */
 149                         case 5:
 150                                 tc_bus[slot].interrupt = SCSI_INT;
 151                                 break;
 152                         case 6:
 153                                 tc_bus[slot].interrupt = ETHER;
 154                                 break;
 155                         default:
 156                                 tc_bus[slot].interrupt = -1;
 157                                 break;
 158                         }
 159                 }
 160         }
 161
 162         dbe_board_handler = old_be_handler;
 163 }
 164
 165 /*
 166  * the main entry
 167  */
 168 void __init tc_init(void)
 169 {
 170         int tc_clock;
 171         int i;
 172         unsigned long slot0addr;
 173         unsigned long slot_size;
 174
 175         if (!TURBOCHANNEL)
 176                 return;
 177
 178         for (i = 0; i < MAX_SLOT; i++) {
 179                 tc_bus[i].base_addr = 0;
 180                 tc_bus[i].name[0] = 0;
 181                 tc_bus[i].vendor[0] = 0;
 182                 tc_bus[i].firmware[0] = 0;
 183                 tc_bus[i].interrupt = -1;
 184                 tc_bus[i].flags = FREE;
 185         }
 186
 187         info = (tcinfo *) rex_gettcinfo();
 188         slot0addr = (unsigned long)KSEG1ADDR(rex_slot_address(0));
 189
 190         switch (mips_machtype) {
 191         case MACH_DS5000_200:
 192                 max_tcslot = 6;
 193                 break;
 194         case MACH_DS5000_1XX:
 195         case MACH_DS5000_2X0:
 196                 max_tcslot = 2;
 197                 break;
 198         case MACH_DS5000_XX:
 199         default:
 200                 max_tcslot = 1;
 201                 break;
 202         }
 203
 204         tc_clock = 10000 / info->clk_period;
 205
 206         if (TURBOCHANNEL && info->slot_size && slot0addr) {
 207                 printk("TURBOchannel rev. %1d at %2d.%1d MHz ", info->revision,
 208                         tc_clock / 10, tc_clock % 10);
 209                 printk("(%sparity)\n", info->parity ? "" : "no ");
 210
 211                 slot_size = info->slot_size << 20;
 212
 213                 tc_probe(slot0addr, slot_size, max_tcslot);
 214
 215                 /*
 216                  * All TURBOchannel DECstations have the onboard devices
 217                  * where the (max_tcslot + 1 or 2 on DS5k/xx) Option Module
 218                  * would be.
 219                  */
 220                 if(mips_machtype == MACH_DS5000_XX)
 221                         i = 2;
 222                 else
 223                         i = 1;
 224
 225                 system_base = slot0addr + slot_size * (max_tcslot + i);
 226
 227 #ifdef TC_DEBUG
 228                 for (i = 0; i <= max_tcslot; i++)
 229                         if (tc_bus[i].base_addr) {
 230                                 printk("    slot %d: ", i);
 231                                 printk("%s %s %s\n", tc_bus[i].vendor,
 232                                         tc_bus[i].name, tc_bus[i].firmware);
 233                         }
 234 #endif
 235                 ioport_resource.end = KSEG2 - 1;
 236         }
 237 }