drivers/tc/tc.c

   1 /*
   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  * Copyright (c) 2001, 2003, 2005  Maciej W. Rozycki
  12  */
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/string.h>
  17 #include <linux/types.h>
  18
  19 #include <asm/addrspace.h>
  20 #include <asm/errno.h>
  21 #include <asm/io.h>
  22 #include <asm/paccess.h>
  23
  24 #include <asm/dec/machtype.h>
  25 #include <asm/dec/prom.h>
  26 #include <asm/dec/tcinfo.h>
  27 #include <asm/dec/tcmodule.h>
  28 #include <asm/dec/interrupts.h>
  29
  30 MODULE_LICENSE("GPL");
  31 slot_info tc_bus[MAX_SLOT];
  32 static int num_tcslots;
  33 static tcinfo *info;
  34
  35 /*
  36  * Interface to the world. Read comment in include/asm-mips/tc.h.
  37  */
  38
  39 int search_tc_card(const char *name)
  40 {
  41         int slot;
  42         slot_info *sip;
  43
  44         for (slot = 0; slot < num_tcslots; slot++) {
  45                 sip = &tc_bus[slot];
  46                 if ((sip->flags & FREE) &&
  47                     (strncmp(sip->name, name, strlen(name)) == 0)) {
  48                         return slot;
  49                 }
  50         }
  51
  52         return -ENODEV;
  53 }
  54
  55 void claim_tc_card(int slot)
  56 {
  57         if (tc_bus[slot].flags & IN_USE) {
  58                 printk("claim_tc_card: attempting to claim a card already in use\n");
  59                 return;
  60         }
  61         tc_bus[slot].flags &= ~FREE;
  62         tc_bus[slot].flags |= IN_USE;
  63 }
  64
  65 void release_tc_card(int slot)
  66 {
  67         if (tc_bus[slot].flags & FREE) {
  68                 printk("release_tc_card: "
  69                        "attempting to release a card already free\n");
  70                 return;
  71         }
  72         tc_bus[slot].flags &= ~IN_USE;
  73         tc_bus[slot].flags |= FREE;
  74 }
  75
  76 unsigned long get_tc_base_addr(int slot)
  77 {
  78         return tc_bus[slot].base_addr;
  79 }
  80
  81 unsigned long get_tc_irq_nr(int slot)
  82 {
  83         return tc_bus[slot].interrupt;
  84 }
  85
  86 unsigned long get_tc_speed(void)
  87 {
  88         return 100000 * (10000 / (unsigned long)info->clk_period);
  89 }
  90
  91 /*
  92  * Probing for TURBOchannel modules
  93  */
  94 static void __init tc_probe(unsigned long startaddr, unsigned long size,
  95                             int slots)
  96 {
  97         unsigned long slotaddr;
  98         int i, slot, err;
  99         long offset;
 100         u8 pattern[4];
 101         volatile u8 *module;
 102
 103         for (slot = 0; slot < slots; slot++) {
 104                 slotaddr = startaddr + slot * size;
 105                 module = ioremap_nocache(slotaddr, size);
 106                 BUG_ON(!module);
 107
 108                 offset = OLDCARD;
 109
 110                 err = 0;
 111                 err |= get_dbe(pattern[0], module + OLDCARD + TC_PATTERN0);
 112                 err |= get_dbe(pattern[1], module + OLDCARD + TC_PATTERN1);
 113                 err |= get_dbe(pattern[2], module + OLDCARD + TC_PATTERN2);
 114                 err |= get_dbe(pattern[3], module + OLDCARD + TC_PATTERN3);
 115                 if (err) {
 116                         iounmap(module);
 117                         continue;
 118                 }
 119
 120                 if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
 121                     pattern[2] != 0xaa || pattern[3] != 0xff) {
 122                         offset = NEWCARD;
 123
 124                         err = 0;
 125                         err |= get_dbe(pattern[0], module + TC_PATTERN0);
 126                         err |= get_dbe(pattern[1], module + TC_PATTERN1);
 127                         err |= get_dbe(pattern[2], module + TC_PATTERN2);
 128                         err |= get_dbe(pattern[3], module + TC_PATTERN3);
 129                         if (err) {
 130                                 iounmap(module);
 131                                 continue;
 132                         }
 133                 }
 134
 135                 if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
 136                     pattern[2] != 0xaa || pattern[3] != 0xff) {
 137                         iounmap(module);
 138                         continue;
 139                 }
 140
 141                 tc_bus[slot].base_addr = slotaddr;
 142                 for (i = 0; i < 8; i++) {
 143                         tc_bus[slot].firmware[i] =
 144                                 module[TC_FIRM_VER + offset + 4 * i];
 145                         tc_bus[slot].vendor[i] =
 146                                 module[TC_VENDOR + offset + 4 * i];
 147                         tc_bus[slot].name[i] =
 148                                 module[TC_MODULE + offset + 4 * i];
 149                 }
 150                 tc_bus[slot].firmware[8] = 0;
 151                 tc_bus[slot].vendor[8] = 0;
 152                 tc_bus[slot].name[8] = 0;
 153                 /*
 154                  * Looks unneccesary, but we may change
 155                  * TC? in the future
 156                  */
 157                 switch (slot) {
 158                 case 0:
 159                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC0];
 160                         break;
 161                 case 1:
 162                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC1];
 163                         break;
 164                 case 2:
 165                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC2];
 166                         break;
 167                 /*
 168                  * Yuck! DS5000/200 onboard devices
 169                  */
 170                 case 5:
 171                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC5];
 172                         break;
 173                 case 6:
 174                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC6];
 175                         break;
 176                 default:
 177                         tc_bus[slot].interrupt = -1;
 178                         break;
 179                 }
 180
 181                 iounmap(module);
 182         }
 183 }
 184
 185 /*
 186  * the main entry
 187  */
 188 static int __init tc_init(void)
 189 {
 190         int tc_clock;
 191         int i;
 192         unsigned long slot0addr;
 193         unsigned long slot_size;
 194
 195         if (!TURBOCHANNEL)
 196                 return 0;
 197
 198         for (i = 0; i < MAX_SLOT; i++) {
 199                 tc_bus[i].base_addr = 0;
 200                 tc_bus[i].name[0] = 0;
 201                 tc_bus[i].vendor[0] = 0;
 202                 tc_bus[i].firmware[0] = 0;
 203                 tc_bus[i].interrupt = -1;
 204                 tc_bus[i].flags = FREE;
 205         }
 206
 207         info = rex_gettcinfo();
 208         slot0addr = CPHYSADDR((long)rex_slot_address(0));
 209
 210         switch (mips_machtype) {
 211         case MACH_DS5000_200:
 212                 num_tcslots = 7;
 213                 break;
 214         case MACH_DS5000_1XX:
 215         case MACH_DS5000_2X0:
 216         case MACH_DS5900:
 217                 num_tcslots = 3;
 218                 break;
 219         case MACH_DS5000_XX:
 220         default:
 221                 num_tcslots = 2;
 222                 break;
 223         }
 224
 225         tc_clock = 10000 / info->clk_period;
 226
 227         if (info->slot_size && slot0addr) {
 228                 pr_info("TURBOchannel rev. %d at %d.%d MHz (with%s parity)\n",
 229                         info->revision, tc_clock / 10, tc_clock % 10,
 230                         info->parity ? "" : "out");
 231
 232                 slot_size = info->slot_size << 20;
 233
 234                 tc_probe(slot0addr, slot_size, num_tcslots);
 235
 236                 for (i = 0; i < num_tcslots; i++) {
 237                         if (!tc_bus[i].base_addr)
 238                                 continue;
 239                         pr_info("    slot %d: %s %s %s\n", i, tc_bus[i].vendor,
 240                                 tc_bus[i].name, tc_bus[i].firmware);
 241                 }
 242         }
 243
 244         return 0;
 245 }
 246
 247 subsys_initcall(tc_init);
 248
 249 EXPORT_SYMBOL(search_tc_card);
 250 EXPORT_SYMBOL(claim_tc_card);
 251 EXPORT_SYMBOL(release_tc_card);
 252 EXPORT_SYMBOL(get_tc_base_addr);
 253 EXPORT_SYMBOL(get_tc_irq_nr);
 254 EXPORT_SYMBOL(get_tc_speed);