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   1 /*  $Id: sun4d_irq.c,v 1.29 2001/12/11 04:55:51 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/errno.h>
  11 #include <linux/linkage.h>
  12 #include <linux/kernel_stat.h>
  13 #include <linux/signal.h>
  14 #include <linux/sched.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/slab.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 #include <linux/seq_file.h>
  24
  25 #include <asm/ptrace.h>
  26 #include <asm/processor.h>
  27 #include <asm/system.h>
  28 #include <asm/psr.h>
  29 #include <asm/smp.h>
  30 #include <asm/vaddrs.h>
  31 #include <asm/timer.h>
  32 #include <asm/openprom.h>
  33 #include <asm/oplib.h>
  34 #include <asm/traps.h>
  35 #include <asm/irq.h>
  36 #include <asm/io.h>
  37 #include <asm/pgalloc.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/sbus.h>
  40 #include <asm/sbi.h>
  41 #include <asm/cacheflush.h>
  42
  43 /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
  44 /* #define DISTRIBUTE_IRQS */
  45
  46 struct sun4d_timer_regs *sun4d_timers;
  47 #define TIMER_IRQ       10
  48
  49 #define MAX_STATIC_ALLOC        4
  50 extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
  51 extern int static_irq_count;
  52 unsigned char cpu_leds[32];
  53 #ifdef CONFIG_SMP
  54 unsigned char sbus_tid[32];
  55 #endif
  56
  57 static struct irqaction *irq_action[NR_IRQS];
  58 extern spinlock_t irq_action_lock;
  59
  60 struct sbus_action {
  61         struct irqaction *action;
  62         /* For SMP this needs to be extended */
  63 } *sbus_actions;
  64
  65 static int pil_to_sbus[] = {
  66         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
  67 };
  68
  69 static int sbus_to_pil[] = {
  70         0, 2, 3, 5, 7, 9, 11, 13,
  71 };
  72
  73 static int nsbi;
  74 #ifdef CONFIG_SMP
  75 DEFINE_SPINLOCK(sun4d_imsk_lock);
  76 #endif
  77
  78 int show_sun4d_interrupts(struct seq_file *p, void *v)
  79 {
  80         int i = *(loff_t *) v, j = 0, k = 0, sbusl;
  81         struct irqaction * action;
  82         unsigned long flags;
  83 #ifdef CONFIG_SMP
  84         int x;
  85 #endif
  86
  87         spin_lock_irqsave(&irq_action_lock, flags);
  88         if (i < NR_IRQS) {
  89                 sbusl = pil_to_sbus[i];
  90                 if (!sbusl) {
  91                         action = *(i + irq_action);
  92                         if (!action)
  93                                 goto out_unlock;
  94                 } else {
  95                         for (j = 0; j < nsbi; j++) {
  96                                 for (k = 0; k < 4; k++)
  97                                         if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
  98                                                 goto found_it;
  99                         }
 100                         goto out_unlock;
 101                 }
 102 found_it:       seq_printf(p, "%3d: ", i);
 103 #ifndef CONFIG_SMP
 104                 seq_printf(p, "%10u ", kstat_irqs(i));
 105 #else
 106                 for_each_online_cpu(x)
 107                         seq_printf(p, "%10u ",
 108                                kstat_cpu(cpu_logical_map(x)).irqs[i]);
 109 #endif
 110                 seq_printf(p, "%c %s",
 111                         (action->flags & SA_INTERRUPT) ? '+' : ' ',
 112                         action->name);
 113                 action = action->next;
 114                 for (;;) {
 115                         for (; action; action = action->next) {
 116                                 seq_printf(p, ",%s %s",
 117                                         (action->flags & SA_INTERRUPT) ? " +" : "",
 118                                         action->name);
 119                         }
 120                         if (!sbusl) break;
 121                         k++;
 122                         if (k < 4)
 123                                 action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
 124                         else {
 125                                 j++;
 126                                 if (j == nsbi) break;
 127                                 k = 0;
 128                                 action = sbus_actions [(j << 5) + (sbusl << 2)].action;
 129                         }
 130                 }
 131                 seq_putc(p, '\n');
 132         }
 133 out_unlock:
 134         spin_unlock_irqrestore(&irq_action_lock, flags);
 135         return 0;
 136 }
 137
 138 void sun4d_free_irq(unsigned int irq, void *dev_id)
 139 {
 140         struct irqaction *action, **actionp;
 141         struct irqaction *tmp = NULL;
 142         unsigned long flags;
 143
 144         spin_lock_irqsave(&irq_action_lock, flags);
 145         if (irq < 15)
 146                 actionp = irq + irq_action;
 147         else
 148                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 149         action = *actionp;
 150         if (!action) {
 151                 printk("Trying to free free IRQ%d\n",irq);
 152                 goto out_unlock;
 153         }
 154         if (dev_id) {
 155                 for (; action; action = action->next) {
 156                         if (action->dev_id == dev_id)
 157                                 break;
 158                         tmp = action;
 159                 }
 160                 if (!action) {
 161                         printk("Trying to free free shared IRQ%d\n",irq);
 162                         goto out_unlock;
 163                 }
 164         } else if (action->flags & SA_SHIRQ) {
 165                 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
 166                 goto out_unlock;
 167         }
 168         if (action->flags & SA_STATIC_ALLOC)
 169         {
 170                 /* This interrupt is marked as specially allocated
 171                  * so it is a bad idea to free it.
 172                  */
 173                 printk("Attempt to free statically allocated IRQ%d (%s)\n",
 174                        irq, action->name);
 175                 goto out_unlock;
 176         }
 177
 178         if (action && tmp)
 179                 tmp->next = action->next;
 180         else
 181                 *actionp = action->next;
 182
 183         spin_unlock_irqrestore(&irq_action_lock, flags);
 184
 185         synchronize_irq(irq);
 186
 187         spin_lock_irqsave(&irq_action_lock, flags);
 188
 189         kfree(action);
 190
 191         if (!(*actionp))
 192                 disable_irq(irq);
 193
 194 out_unlock:
 195         spin_unlock_irqrestore(&irq_action_lock, flags);
 196 }
 197
 198 extern void unexpected_irq(int, void *, struct pt_regs *);
 199
 200 void sun4d_handler_irq(int irq, struct pt_regs * regs)
 201 {
 202         struct irqaction * action;
 203         int cpu = smp_processor_id();
 204         /* SBUS IRQ level (1 - 7) */
 205         int sbusl = pil_to_sbus[irq];
 206
 207         /* FIXME: Is this necessary?? */
 208         cc_get_ipen();
 209
 210         cc_set_iclr(1 << irq);
 211
 212         irq_enter();
 213         kstat_cpu(cpu).irqs[irq]++;
 214         if (!sbusl) {
 215                 action = *(irq + irq_action);
 216                 if (!action)
 217                         unexpected_irq(irq, NULL, regs);
 218                 do {
 219                         action->handler(irq, action->dev_id, regs);
 220                         action = action->next;
 221                 } while (action);
 222         } else {
 223                 int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
 224                 int sbino;
 225                 struct sbus_action *actionp;
 226                 unsigned mask, slot;
 227                 int sbil = (sbusl << 2);
 228
 229                 bw_clear_intr_mask(sbusl, bus_mask);
 230
 231                 /* Loop for each pending SBI */
 232                 for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
 233                         if (bus_mask & 1) {
 234                                 mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
 235                                 mask &= (0xf << sbil);
 236                                 actionp = sbus_actions + (sbino << 5) + (sbil);
 237                                 /* Loop for each pending SBI slot */
 238                                 for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
 239                                         if (mask & slot) {
 240                                                 mask &= ~slot;
 241                                                 action = actionp->action;
 242
 243                                                 if (!action)
 244                                                         unexpected_irq(irq, NULL, regs);
 245                                                 do {
 246                                                         action->handler(irq, action->dev_id, regs);
 247                                                         action = action->next;
 248                                                 } while (action);
 249                                                 release_sbi(SBI2DEVID(sbino), slot);
 250                                         }
 251                         }
 252         }
 253         irq_exit();
 254 }
 255
 256 unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
 257 {
 258         int sbusl = pil_to_sbus[irq];
 259
 260         if (sbusl)
 261                 return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
 262         else
 263                 return irq;
 264 }
 265
 266 unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
 267 {
 268         if (sbint >= sizeof(sbus_to_pil)) {
 269                 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
 270                 BUG();
 271         }
 272         return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
 273 }
 274
 275 int sun4d_request_irq(unsigned int irq,
 276                 irqreturn_t (*handler)(int, void *, struct pt_regs *),
 277                 unsigned long irqflags, const char * devname, void *dev_id)
 278 {
 279         struct irqaction *action, *tmp = NULL, **actionp;
 280         unsigned long flags;
 281         int ret;
 282
 283         if(irq > 14 && irq < (1 << 5)) {
 284                 ret = -EINVAL;
 285                 goto out;
 286         }
 287
 288         if (!handler) {
 289                 ret = -EINVAL;
 290                 goto out;
 291         }
 292
 293         spin_lock_irqsave(&irq_action_lock, flags);
 294
 295         if (irq >= (1 << 5))
 296                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 297         else
 298                 actionp = irq + irq_action;
 299         action = *actionp;
 300
 301         if (action) {
 302                 if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
 303                         for (tmp = action; tmp->next; tmp = tmp->next);
 304                 } else {
 305                         ret = -EBUSY;
 306                         goto out_unlock;
 307                 }
 308                 if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {
 309                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
 310                         ret = -EBUSY;
 311                         goto out_unlock;
 312                 }
 313                 action = NULL;          /* Or else! */
 314         }
 315
 316         /* If this is flagged as statically allocated then we use our
 317          * private struct which is never freed.
 318          */
 319         if (irqflags & SA_STATIC_ALLOC) {
 320                 if (static_irq_count < MAX_STATIC_ALLOC)
 321                         action = &static_irqaction[static_irq_count++];
 322                 else
 323                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
 324         }
 325
 326         if (action == NULL)
 327                 action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
 328                                                      GFP_ATOMIC);
 329
 330         if (!action) {
 331                 ret = -ENOMEM;
 332                 goto out_unlock;
 333         }
 334
 335         action->handler = handler;
 336         action->flags = irqflags;
 337         cpus_clear(action->mask);
 338         action->name = devname;
 339         action->next = NULL;
 340         action->dev_id = dev_id;
 341
 342         if (tmp)
 343                 tmp->next = action;
 344         else
 345                 *actionp = action;
 346
 347         enable_irq(irq);
 348
 349         ret = 0;
 350 out_unlock:
 351         spin_unlock_irqrestore(&irq_action_lock, flags);
 352 out:
 353         return ret;
 354 }
 355
 356 static void sun4d_disable_irq(unsigned int irq)
 357 {
 358 #ifdef CONFIG_SMP
 359         int tid = sbus_tid[(irq >> 5) - 1];
 360         unsigned long flags;
 361 #endif
 362
 363         if (irq < NR_IRQS) return;
 364 #ifdef CONFIG_SMP
 365         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 366         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
 367         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 368 #else
 369         cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
 370 #endif
 371 }
 372
 373 static void sun4d_enable_irq(unsigned int irq)
 374 {
 375 #ifdef CONFIG_SMP
 376         int tid = sbus_tid[(irq >> 5) - 1];
 377         unsigned long flags;
 378 #endif
 379
 380         if (irq < NR_IRQS) return;
 381 #ifdef CONFIG_SMP
 382         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 383         cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 384         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 385 #else
 386         cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 387 #endif
 388 }
 389
 390 #ifdef CONFIG_SMP
 391 static void sun4d_set_cpu_int(int cpu, int level)
 392 {
 393         sun4d_send_ipi(cpu, level);
 394 }
 395
 396 static void sun4d_clear_ipi(int cpu, int level)
 397 {
 398 }
 399
 400 static void sun4d_set_udt(int cpu)
 401 {
 402 }
 403
 404 /* Setup IRQ distribution scheme. */
 405 void __init sun4d_distribute_irqs(void)
 406 {
 407 #ifdef DISTRIBUTE_IRQS
 408         struct sbus_bus *sbus;
 409         unsigned long sbus_serving_map;
 410
 411         sbus_serving_map = cpu_present_map;
 412         for_each_sbus(sbus) {
 413                 if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
 414                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 415                 else if (cpu_present_map & (1 << (sbus->board * 2)))
 416                         sbus_tid[sbus->board] = (sbus->board * 2);
 417                 else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
 418                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 419                 else
 420                         sbus_tid[sbus->board] = 0xff;
 421                 if (sbus_tid[sbus->board] != 0xff)
 422                         sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
 423         }
 424         for_each_sbus(sbus)
 425                 if (sbus_tid[sbus->board] == 0xff) {
 426                         int i = 31;
 427
 428                         if (!sbus_serving_map)
 429                                 sbus_serving_map = cpu_present_map;
 430                         while (!(sbus_serving_map & (1 << i)))
 431                                 i--;
 432                         sbus_tid[sbus->board] = i;
 433                         sbus_serving_map &= ~(1 << i);
 434                 }
 435         for_each_sbus(sbus) {
 436                 printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
 437                 set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
 438         }
 439 #else
 440         struct sbus_bus *sbus;
 441         int cpuid = cpu_logical_map(1);
 442
 443         if (cpuid == -1)
 444                 cpuid = cpu_logical_map(0);
 445         for_each_sbus(sbus) {
 446                 sbus_tid[sbus->board] = cpuid;
 447                 set_sbi_tid(sbus->devid, cpuid << 3);
 448         }
 449         printk("All sbus IRQs directed to CPU%d\n", cpuid);
 450 #endif
 451 }
 452 #endif
 453
 454 static void sun4d_clear_clock_irq(void)
 455 {
 456         volatile unsigned int clear_intr;
 457         clear_intr = sun4d_timers->l10_timer_limit;
 458 }
 459
 460 static void sun4d_clear_profile_irq(int cpu)
 461 {
 462         bw_get_prof_limit(cpu);
 463 }
 464
 465 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
 466 {
 467         bw_set_prof_limit(cpu, limit);
 468 }
 469
 470 static void __init sun4d_init_timers(irqreturn_t (*counter_fn)(int, void *, struct pt_regs *))
 471 {
 472         int irq;
 473         int cpu;
 474         struct resource r;
 475         int mid;
 476
 477         /* Map the User Timer registers. */
 478         memset(&r, 0, sizeof(r));
 479 #ifdef CONFIG_SMP
 480         r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
 481 #else
 482         r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
 483 #endif
 484         r.flags = 0xf;
 485         sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
 486             PAGE_SIZE, "user timer");
 487
 488         sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
 489         master_l10_counter = &sun4d_timers->l10_cur_count;
 490         master_l10_limit = &sun4d_timers->l10_timer_limit;
 491
 492         irq = request_irq(TIMER_IRQ,
 493                           counter_fn,
 494                           (SA_INTERRUPT | SA_STATIC_ALLOC),
 495                           "timer", NULL);
 496         if (irq) {
 497                 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
 498                 prom_halt();
 499         }
 500
 501         /* Enable user timer free run for CPU 0 in BW */
 502         /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
 503
 504         cpu = 0;
 505         while (!cpu_find_by_instance(cpu, NULL, &mid)) {
 506                 sun4d_load_profile_irq(mid >> 3, 0);
 507                 cpu++;
 508         }
 509
 510 #ifdef CONFIG_SMP
 511         {
 512                 unsigned long flags;
 513                 extern unsigned long lvl14_save[4];
 514                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 515                 extern unsigned int real_irq_entry[], smp4d_ticker[];
 516                 extern unsigned int patchme_maybe_smp_msg[];
 517
 518                 /* Adjust so that we jump directly to smp4d_ticker */
 519                 lvl14_save[2] += smp4d_ticker - real_irq_entry;
 520
 521                 /* For SMP we use the level 14 ticker, however the bootup code
 522                  * has copied the firmwares level 14 vector into boot cpu's
 523                  * trap table, we must fix this now or we get squashed.
 524                  */
 525                 local_irq_save(flags);
 526                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
 527                 trap_table->inst_one = lvl14_save[0];
 528                 trap_table->inst_two = lvl14_save[1];
 529                 trap_table->inst_three = lvl14_save[2];
 530                 trap_table->inst_four = lvl14_save[3];
 531                 local_flush_cache_all();
 532                 local_irq_restore(flags);
 533         }
 534 #endif
 535 }
 536
 537 void __init sun4d_init_sbi_irq(void)
 538 {
 539         struct sbus_bus *sbus;
 540         unsigned mask;
 541
 542         nsbi = 0;
 543         for_each_sbus(sbus)
 544                 nsbi++;
 545         sbus_actions = (struct sbus_action *)kmalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
 546         memset (sbus_actions, 0, (nsbi * 8 * 4 * sizeof(struct sbus_action)));
 547         for_each_sbus(sbus) {
 548 #ifdef CONFIG_SMP
 549                 extern unsigned char boot_cpu_id;
 550
 551                 set_sbi_tid(sbus->devid, boot_cpu_id << 3);
 552                 sbus_tid[sbus->board] = boot_cpu_id;
 553 #endif
 554                 /* Get rid of pending irqs from PROM */
 555                 mask = acquire_sbi(sbus->devid, 0xffffffff);
 556                 if (mask) {
 557                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
 558                         release_sbi(sbus->devid, mask);
 559                 }
 560         }
 561 }
 562
 563 static char *sun4d_irq_itoa(unsigned int irq)
 564 {
 565         static char buff[16];
 566
 567         if (irq < (1 << 5))
 568                 sprintf(buff, "%d", irq);
 569         else
 570                 sprintf(buff, "%d,%x", sbus_to_pil[(irq >> 2) & 7], irq);
 571         return buff;
 572 }
 573
 574 void __init sun4d_init_IRQ(void)
 575 {
 576         local_irq_disable();
 577
 578         BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
 579         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
 580         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
 581         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
 582         BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
 583         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
 584         BTFIXUPSET_CALL(__irq_itoa, sun4d_irq_itoa, BTFIXUPCALL_NORM);
 585         sparc_init_timers = sun4d_init_timers;
 586 #ifdef CONFIG_SMP
 587         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
 588         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
 589         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
 590 #endif
 591         /* Cannot enable interrupts until OBP ticker is disabled. */
 592 }