arch/sparc/kernel/sun4d_irq.c

   1 /*  $Id: sun4d_irq.c,v 1.26 2000/07/26 01:04:03 davem Exp $
   2  *  arch/sparc/kernel/sun4d_irq.c:
   3  *                      SS1000/SC2000 interrupt handling.
   4  *
   5  *  Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  *  Heavily based on arch/sparc/kernel/irq.c.
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/ptrace.h>
  11 #include <linux/errno.h>
  12 #include <linux/linkage.h>
  13 #include <linux/kernel_stat.h>
  14 #include <linux/signal.h>
  15 #include <linux/sched.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/malloc.h>
  18 #include <linux/random.h>
  19 #include <linux/init.h>
  20 #include <linux/smp.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/spinlock.h>
  23
  24 #include <asm/ptrace.h>
  25 #include <asm/processor.h>
  26 #include <asm/system.h>
  27 #include <asm/psr.h>
  28 #include <asm/smp.h>
  29 #include <asm/vaddrs.h>
  30 #include <asm/timer.h>
  31 #include <asm/openprom.h>
  32 #include <asm/oplib.h>
  33 #include <asm/traps.h>
  34 #include <asm/irq.h>
  35 #include <asm/io.h>
  36 #include <asm/pgalloc.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/sbus.h>
  39 #include <asm/sbi.h>
  40
  41 /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
  42 /* #define DISTRIBUTE_IRQS */
  43
  44 struct sun4d_timer_regs *sun4d_timers;
  45 #define TIMER_IRQ       10
  46
  47 #define MAX_STATIC_ALLOC        4
  48 extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
  49 extern int static_irq_count;
  50 unsigned char cpu_leds[32];
  51 #ifdef CONFIG_SMP
  52 unsigned char sbus_tid[32];
  53 #endif
  54
  55 extern struct irqaction *irq_action[];
  56
  57 struct sbus_action {
  58         struct irqaction *action;
  59         /* For SMP this needs to be extended */
  60 } *sbus_actions;
  61
  62 static int pil_to_sbus[] = {
  63         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
  64 };
  65
  66 static int sbus_to_pil[] = {
  67         0, 2, 3, 5, 7, 9, 11, 13,
  68 };
  69
  70 static int nsbi;
  71 #ifdef CONFIG_SMP
  72 spinlock_t sun4d_imsk_lock = SPIN_LOCK_UNLOCKED;
  73 #endif
  74
  75 int sun4d_get_irq_list(char *buf)
  76 {
  77         int i, j = 0, k = 0, len = 0, sbusl;
  78         struct irqaction * action;
  79 #ifdef CONFIG_SMP
  80         int x;
  81 #endif
  82
  83         for (i = 0 ; i < NR_IRQS ; i++) {
  84                 sbusl = pil_to_sbus[i];
  85                 if (!sbusl) {
  86                         action = *(i + irq_action);
  87                         if (!action)
  88                                 continue;
  89                 } else {
  90                         for (j = 0; j < nsbi; j++) {
  91                                 for (k = 0; k < 4; k++)
  92                                         if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
  93                                                 goto found_it;
  94                         }
  95                         continue;
  96                 }
  97 found_it:       len += sprintf(buf+len, "%3d: ", i);
  98 #ifndef CONFIG_SMP
  99                 len += sprintf(buf+len, "%10u ", kstat_irqs(i));
 100 #else
 101                 for (x = 0; x < smp_num_cpus; x++)
 102                         len += sprintf(buf+len, "%10u ",
 103                                        kstat.irqs[cpu_logical_map(x)][i]);
 104 #endif
 105                 len += sprintf(buf+len, "%c %s",
 106                         (action->flags & SA_INTERRUPT) ? '+' : ' ',
 107                         action->name);
 108                 action = action->next;
 109                 for (;;) {
 110                         for (; action; action = action->next) {
 111                                 len += sprintf(buf+len, ",%s %s",
 112                                         (action->flags & SA_INTERRUPT) ? " +" : "",
 113                                         action->name);
 114                         }
 115                         if (!sbusl) break;
 116                         k++;
 117                         if (k < 4)
 118                                 action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
 119                         else {
 120                                 j++;
 121                                 if (j == nsbi) break;
 122                                 k = 0;
 123                                 action = sbus_actions [(j << 5) + (sbusl << 2)].action;
 124                         }
 125                 }
 126                 len += sprintf(buf+len, "\n");
 127         }
 128         return len;
 129 }
 130
 131 void sun4d_free_irq(unsigned int irq, void *dev_id)
 132 {
 133         struct irqaction *action, **actionp;
 134         struct irqaction *tmp = NULL;
 135         unsigned long flags;
 136
 137         if (irq < 15)
 138                 actionp = irq + irq_action;
 139         else
 140                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 141         action = *actionp;
 142         if (!action) {
 143                 printk("Trying to free free IRQ%d\n",irq);
 144                 return;
 145         }
 146         if (dev_id) {
 147                 for (; action; action = action->next) {
 148                         if (action->dev_id == dev_id)
 149                                 break;
 150                         tmp = action;
 151                 }
 152                 if (!action) {
 153                         printk("Trying to free free shared IRQ%d\n",irq);
 154                         return;
 155                 }
 156         } else if (action->flags & SA_SHIRQ) {
 157                 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
 158                 return;
 159         }
 160         if (action->flags & SA_STATIC_ALLOC)
 161         {
 162             /* This interrupt is marked as specially allocated
 163              * so it is a bad idea to free it.
 164              */
 165             printk("Attempt to free statically allocated IRQ%d (%s)\n",
 166                    irq, action->name);
 167             return;
 168         }
 169
 170         save_and_cli(flags);
 171         if (action && tmp)
 172                 tmp->next = action->next;
 173         else
 174                 *actionp = action->next;
 175
 176         kfree(action);
 177
 178         if (!(*actionp))
 179                 disable_irq(irq);
 180
 181         restore_flags(flags);
 182 }
 183
 184 extern void unexpected_irq(int, void *, struct pt_regs *);
 185
 186 void sun4d_handler_irq(int irq, struct pt_regs * regs)
 187 {
 188         struct irqaction * action;
 189         int cpu = smp_processor_id();
 190         /* SBUS IRQ level (1 - 7) */
 191         int sbusl = pil_to_sbus[irq];
 192
 193         /* FIXME: Is this necessary?? */
 194         cc_get_ipen();
 195
 196         cc_set_iclr(1 << irq);
 197
 198         irq_enter(cpu, irq);
 199         kstat.irqs[cpu][irq]++;
 200         if (!sbusl) {
 201                 action = *(irq + irq_action);
 202                 if (!action)
 203                         unexpected_irq(irq, 0, regs);
 204                 do {
 205                         action->handler(irq, action->dev_id, regs);
 206                         action = action->next;
 207                 } while (action);
 208         } else {
 209                 int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
 210                 int sbino;
 211                 struct sbus_action *actionp;
 212                 unsigned mask, slot;
 213                 int sbil = (sbusl << 2);
 214
 215                 bw_clear_intr_mask(sbusl, bus_mask);
 216
 217                 /* Loop for each pending SBI */
 218                 for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
 219                         if (bus_mask & 1) {
 220                                 mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
 221                                 mask &= (0xf << sbil);
 222                                 actionp = sbus_actions + (sbino << 5) + (sbil);
 223                                 /* Loop for each pending SBI slot */
 224                                 for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
 225                                         if (mask & slot) {
 226                                                 mask &= ~slot;
 227                                                 action = actionp->action;
 228
 229                                                 if (!action)
 230                                                         unexpected_irq(irq, 0, regs);
 231                                                 do {
 232                                                         action->handler(irq, action->dev_id, regs);
 233                                                         action = action->next;
 234                                                 } while (action);
 235                                                 release_sbi(SBI2DEVID(sbino), slot);
 236                                         }
 237                         }
 238         }
 239         irq_exit(cpu, irq);
 240 }
 241
 242 unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
 243 {
 244         int sbusl = pil_to_sbus[irq];
 245
 246         if (sbusl)
 247                 return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
 248         else
 249                 return irq;
 250 }
 251
 252 int sun4d_request_irq(unsigned int irq,
 253                 void (*handler)(int, void *, struct pt_regs *),
 254                 unsigned long irqflags, const char * devname, void *dev_id)
 255 {
 256         struct irqaction *action, *tmp = NULL, **actionp;
 257         unsigned long flags;
 258
 259         if(irq > 14 && irq < (1 << 5))
 260                 return -EINVAL;
 261
 262         if (!handler)
 263             return -EINVAL;
 264
 265         if (irq >= (1 << 5))
 266                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 267         else
 268                 actionp = irq + irq_action;
 269         action = *actionp;
 270
 271         if (action) {
 272                 if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
 273                         for (tmp = action; tmp->next; tmp = tmp->next);
 274                 } else {
 275                         return -EBUSY;
 276                 }
 277                 if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {
 278                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
 279                         return -EBUSY;
 280                 }
 281                 action = NULL;          /* Or else! */
 282         }
 283
 284         save_and_cli(flags);
 285
 286         /* If this is flagged as statically allocated then we use our
 287          * private struct which is never freed.
 288          */
 289         if (irqflags & SA_STATIC_ALLOC) {
 290             if (static_irq_count < MAX_STATIC_ALLOC)
 291                 action = &static_irqaction[static_irq_count++];
 292             else
 293                 printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",irq, devname);
 294         }
 295
 296         if (action == NULL)
 297             action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
 298                                                  GFP_KERNEL);
 299
 300         if (!action) {
 301                 restore_flags(flags);
 302                 return -ENOMEM;
 303         }
 304
 305         action->handler = handler;
 306         action->flags = irqflags;
 307         action->mask = 0;
 308         action->name = devname;
 309         action->next = NULL;
 310         action->dev_id = dev_id;
 311
 312         if (tmp)
 313                 tmp->next = action;
 314         else
 315                 *actionp = action;
 316
 317         enable_irq(irq);
 318         restore_flags(flags);
 319         return 0;
 320 }
 321
 322 static void sun4d_disable_irq(unsigned int irq)
 323 {
 324 #ifdef CONFIG_SMP
 325         int tid = sbus_tid[(irq >> 5) - 1];
 326         unsigned long flags;
 327 #endif
 328
 329         if (irq < NR_IRQS) return;
 330 #ifdef CONFIG_SMP
 331         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 332         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
 333         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 334 #else
 335         cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
 336 #endif
 337 }
 338
 339 static void sun4d_enable_irq(unsigned int irq)
 340 {
 341 #ifdef CONFIG_SMP
 342         int tid = sbus_tid[(irq >> 5) - 1];
 343         unsigned long flags;
 344 #endif
 345
 346         if (irq < NR_IRQS) return;
 347 #ifdef CONFIG_SMP
 348         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 349         cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 350         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 351 #else
 352         cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 353 #endif
 354 }
 355
 356 #ifdef CONFIG_SMP
 357 static void sun4d_set_cpu_int(int cpu, int level)
 358 {
 359         sun4d_send_ipi(cpu, level);
 360 }
 361
 362 static void sun4d_clear_ipi(int cpu, int level)
 363 {
 364 }
 365
 366 static void sun4d_set_udt(int cpu)
 367 {
 368 }
 369
 370 /* Setup IRQ distribution scheme. */
 371 void __init sun4d_distribute_irqs(void)
 372 {
 373 #ifdef DISTRIBUTE_IRQS
 374         struct sbus_bus *sbus;
 375         unsigned long sbus_serving_map;
 376
 377         sbus_serving_map = cpu_present_map;
 378         for_each_sbus(sbus) {
 379                 if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
 380                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 381                 else if (cpu_present_map & (1 << (sbus->board * 2)))
 382                         sbus_tid[sbus->board] = (sbus->board * 2);
 383                 else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
 384                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 385                 else
 386                         sbus_tid[sbus->board] = 0xff;
 387                 if (sbus_tid[sbus->board] != 0xff)
 388                         sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
 389         }
 390         for_each_sbus(sbus)
 391                 if (sbus_tid[sbus->board] == 0xff) {
 392                         int i = 31;
 393
 394                         if (!sbus_serving_map)
 395                                 sbus_serving_map = cpu_present_map;
 396                         while (!(sbus_serving_map & (1 << i)))
 397                                 i--;
 398                         sbus_tid[sbus->board] = i;
 399                         sbus_serving_map &= ~(1 << i);
 400                 }
 401         for_each_sbus(sbus) {
 402                 printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
 403                 set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
 404         }
 405 #else
 406         struct sbus_bus *sbus;
 407         int cpuid = cpu_logical_map(1);
 408
 409         if (cpuid == -1)
 410                 cpuid = cpu_logical_map(0);
 411         for_each_sbus(sbus) {
 412                 sbus_tid[sbus->board] = cpuid;
 413                 set_sbi_tid(sbus->devid, cpuid << 3);
 414         }
 415         printk("All sbus IRQs directed to CPU%d\n", cpuid);
 416 #endif
 417 }
 418 #endif
 419
 420 static void sun4d_clear_clock_irq(void)
 421 {
 422         volatile unsigned int clear_intr;
 423         clear_intr = sun4d_timers->l10_timer_limit;
 424 }
 425
 426 static void sun4d_clear_profile_irq(int cpu)
 427 {
 428         bw_get_prof_limit(cpu);
 429 }
 430
 431 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
 432 {
 433         bw_set_prof_limit(cpu, limit);
 434 }
 435
 436 static void __init sun4d_init_timers(void (*counter_fn)(int, void *, struct pt_regs *))
 437 {
 438         int irq;
 439         extern struct prom_cpuinfo linux_cpus[NR_CPUS];
 440         int cpu;
 441         struct resource r;
 442
 443         /* Map the User Timer registers. */
 444         memset(&r, 0, sizeof(r));
 445 #ifdef CONFIG_SMP
 446         r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
 447 #else
 448         r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
 449 #endif
 450         r.flags = 0xf;
 451         sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
 452             PAGE_SIZE, "user timer");
 453
 454         sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
 455         master_l10_counter = &sun4d_timers->l10_cur_count;
 456         master_l10_limit = &sun4d_timers->l10_timer_limit;
 457
 458         irq = request_irq(TIMER_IRQ,
 459                           counter_fn,
 460                           (SA_INTERRUPT | SA_STATIC_ALLOC),
 461                           "timer", NULL);
 462         if (irq) {
 463                 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
 464                 prom_halt();
 465         }
 466
 467         /* Enable user timer free run for CPU 0 in BW */
 468         /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
 469
 470         for(cpu = 0; cpu < linux_num_cpus; cpu++)
 471                 sun4d_load_profile_irq((linux_cpus[cpu].mid >> 3), 0);
 472
 473 #ifdef CONFIG_SMP
 474         {
 475                 unsigned long flags;
 476                 extern unsigned long lvl14_save[4];
 477                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 478                 extern unsigned int real_irq_entry[], smp4d_ticker[];
 479                 extern unsigned int patchme_maybe_smp_msg[];
 480
 481                 /* Adjust so that we jump directly to smp4d_ticker */
 482                 lvl14_save[2] += smp4d_ticker - real_irq_entry;
 483
 484                 /* For SMP we use the level 14 ticker, however the bootup code
 485                  * has copied the firmwares level 14 vector into boot cpu's
 486                  * trap table, we must fix this now or we get squashed.
 487                  */
 488                 __save_and_cli(flags);
 489                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
 490                 trap_table->inst_one = lvl14_save[0];
 491                 trap_table->inst_two = lvl14_save[1];
 492                 trap_table->inst_three = lvl14_save[2];
 493                 trap_table->inst_four = lvl14_save[3];
 494                 local_flush_cache_all();
 495                 __restore_flags(flags);
 496         }
 497 #endif
 498 }
 499
 500 void __init sun4d_init_sbi_irq(void)
 501 {
 502         struct sbus_bus *sbus;
 503         unsigned mask;
 504
 505         nsbi = 0;
 506         for_each_sbus(sbus)
 507                 nsbi++;
 508         sbus_actions = (struct sbus_action *)kmalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
 509         memset (sbus_actions, 0, (nsbi * 8 * 4 * sizeof(struct sbus_action)));
 510         for_each_sbus(sbus) {
 511 #ifdef CONFIG_SMP
 512                 extern unsigned char boot_cpu_id;
 513
 514                 set_sbi_tid(sbus->devid, boot_cpu_id << 3);
 515                 sbus_tid[sbus->board] = boot_cpu_id;
 516 #endif
 517                 /* Get rid of pending irqs from PROM */
 518                 mask = acquire_sbi(sbus->devid, 0xffffffff);
 519                 if (mask) {
 520                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
 521                         release_sbi(sbus->devid, mask);
 522                 }
 523         }
 524 }
 525
 526 static char *sun4d_irq_itoa(unsigned int irq)
 527 {
 528         static char buff[16];
 529
 530         if (irq < (1 << 5))
 531                 sprintf(buff, "%d", irq);
 532         else
 533                 sprintf(buff, "%d,%x", sbus_to_pil[(irq >> 2) & 7], irq);
 534         return buff;
 535 }
 536
 537 void __init sun4d_init_IRQ(void)
 538 {
 539         __cli();
 540
 541         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
 542         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
 543         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
 544         BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
 545         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
 546         BTFIXUPSET_CALL(__irq_itoa, sun4d_irq_itoa, BTFIXUPCALL_NORM);
 547         init_timers = sun4d_init_timers;
 548 #ifdef CONFIG_SMP
 549         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
 550         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
 551         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
 552 #endif
 553         /* Cannot enable interrupts until OBP ticker is disabled. */
 554 }