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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/errno.h>
  10 #include <linux/linkage.h>
  11 #include <linux/kernel_stat.h>
  12 #include <linux/signal.h>
  13 #include <linux/sched.h>
  14 #include <linux/ptrace.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/slab.h>
  17 #include <linux/random.h>
  18 #include <linux/init.h>
  19 #include <linux/smp.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/seq_file.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 #include <asm/cacheflush.h>
  41 #include <asm/irq_regs.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 & IRQF_DISABLED) ? '+' : ' ',
 112                         action->name);
 113                 action = action->next;
 114                 for (;;) {
 115                         for (; action; action = action->next) {
 116                                 seq_printf(p, ",%s %s",
 117                                         (action->flags & IRQF_DISABLED) ? " +" : "",
 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 & IRQF_SHARED) {
 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 pt_regs *old_regs;
 203         struct irqaction * action;
 204         int cpu = smp_processor_id();
 205         /* SBUS IRQ level (1 - 7) */
 206         int sbusl = pil_to_sbus[irq];
 207
 208         /* FIXME: Is this necessary?? */
 209         cc_get_ipen();
 210
 211         cc_set_iclr(1 << irq);
 212
 213         old_regs = set_irq_regs(regs);
 214         irq_enter();
 215         kstat_cpu(cpu).irqs[irq]++;
 216         if (!sbusl) {
 217                 action = *(irq + irq_action);
 218                 if (!action)
 219                         unexpected_irq(irq, NULL, regs);
 220                 do {
 221                         action->handler(irq, action->dev_id);
 222                         action = action->next;
 223                 } while (action);
 224         } else {
 225                 int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
 226                 int sbino;
 227                 struct sbus_action *actionp;
 228                 unsigned mask, slot;
 229                 int sbil = (sbusl << 2);
 230
 231                 bw_clear_intr_mask(sbusl, bus_mask);
 232
 233                 /* Loop for each pending SBI */
 234                 for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
 235                         if (bus_mask & 1) {
 236                                 mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
 237                                 mask &= (0xf << sbil);
 238                                 actionp = sbus_actions + (sbino << 5) + (sbil);
 239                                 /* Loop for each pending SBI slot */
 240                                 for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
 241                                         if (mask & slot) {
 242                                                 mask &= ~slot;
 243                                                 action = actionp->action;
 244
 245                                                 if (!action)
 246                                                         unexpected_irq(irq, NULL, regs);
 247                                                 do {
 248                                                         action->handler(irq, action->dev_id);
 249                                                         action = action->next;
 250                                                 } while (action);
 251                                                 release_sbi(SBI2DEVID(sbino), slot);
 252                                         }
 253                         }
 254         }
 255         irq_exit();
 256         set_irq_regs(old_regs);
 257 }
 258
 259 unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
 260 {
 261         int sbusl = pil_to_sbus[irq];
 262
 263         if (sbusl)
 264                 return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
 265         else
 266                 return irq;
 267 }
 268
 269 unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
 270 {
 271         if (sbint >= sizeof(sbus_to_pil)) {
 272                 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
 273                 BUG();
 274         }
 275         return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
 276 }
 277
 278 int sun4d_request_irq(unsigned int irq,
 279                 irq_handler_t handler,
 280                 unsigned long irqflags, const char * devname, void *dev_id)
 281 {
 282         struct irqaction *action, *tmp = NULL, **actionp;
 283         unsigned long flags;
 284         int ret;
 285
 286         if(irq > 14 && irq < (1 << 5)) {
 287                 ret = -EINVAL;
 288                 goto out;
 289         }
 290
 291         if (!handler) {
 292                 ret = -EINVAL;
 293                 goto out;
 294         }
 295
 296         spin_lock_irqsave(&irq_action_lock, flags);
 297
 298         if (irq >= (1 << 5))
 299                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 300         else
 301                 actionp = irq + irq_action;
 302         action = *actionp;
 303
 304         if (action) {
 305                 if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
 306                         for (tmp = action; tmp->next; tmp = tmp->next);
 307                 } else {
 308                         ret = -EBUSY;
 309                         goto out_unlock;
 310                 }
 311                 if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
 312                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
 313                         ret = -EBUSY;
 314                         goto out_unlock;
 315                 }
 316                 action = NULL;          /* Or else! */
 317         }
 318
 319         /* If this is flagged as statically allocated then we use our
 320          * private struct which is never freed.
 321          */
 322         if (irqflags & SA_STATIC_ALLOC) {
 323                 if (static_irq_count < MAX_STATIC_ALLOC)
 324                         action = &static_irqaction[static_irq_count++];
 325                 else
 326                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
 327         }
 328
 329         if (action == NULL)
 330                 action = kmalloc(sizeof(struct irqaction),
 331                                                      GFP_ATOMIC);
 332
 333         if (!action) {
 334                 ret = -ENOMEM;
 335                 goto out_unlock;
 336         }
 337
 338         action->handler = handler;
 339         action->flags = irqflags;
 340         cpus_clear(action->mask);
 341         action->name = devname;
 342         action->next = NULL;
 343         action->dev_id = dev_id;
 344
 345         if (tmp)
 346                 tmp->next = action;
 347         else
 348                 *actionp = action;
 349
 350         enable_irq(irq);
 351
 352         ret = 0;
 353 out_unlock:
 354         spin_unlock_irqrestore(&irq_action_lock, flags);
 355 out:
 356         return ret;
 357 }
 358
 359 static void sun4d_disable_irq(unsigned int irq)
 360 {
 361 #ifdef CONFIG_SMP
 362         int tid = sbus_tid[(irq >> 5) - 1];
 363         unsigned long flags;
 364 #endif
 365
 366         if (irq < NR_IRQS) return;
 367 #ifdef CONFIG_SMP
 368         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 369         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
 370         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 371 #else
 372         cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
 373 #endif
 374 }
 375
 376 static void sun4d_enable_irq(unsigned int irq)
 377 {
 378 #ifdef CONFIG_SMP
 379         int tid = sbus_tid[(irq >> 5) - 1];
 380         unsigned long flags;
 381 #endif
 382
 383         if (irq < NR_IRQS) return;
 384 #ifdef CONFIG_SMP
 385         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 386         cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 387         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 388 #else
 389         cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 390 #endif
 391 }
 392
 393 #ifdef CONFIG_SMP
 394 static void sun4d_set_cpu_int(int cpu, int level)
 395 {
 396         sun4d_send_ipi(cpu, level);
 397 }
 398
 399 static void sun4d_clear_ipi(int cpu, int level)
 400 {
 401 }
 402
 403 static void sun4d_set_udt(int cpu)
 404 {
 405 }
 406
 407 /* Setup IRQ distribution scheme. */
 408 void __init sun4d_distribute_irqs(void)
 409 {
 410 #ifdef DISTRIBUTE_IRQS
 411         struct sbus_bus *sbus;
 412         unsigned long sbus_serving_map;
 413
 414         sbus_serving_map = cpu_present_map;
 415         for_each_sbus(sbus) {
 416                 if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
 417                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 418                 else if (cpu_present_map & (1 << (sbus->board * 2)))
 419                         sbus_tid[sbus->board] = (sbus->board * 2);
 420                 else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
 421                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 422                 else
 423                         sbus_tid[sbus->board] = 0xff;
 424                 if (sbus_tid[sbus->board] != 0xff)
 425                         sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
 426         }
 427         for_each_sbus(sbus)
 428                 if (sbus_tid[sbus->board] == 0xff) {
 429                         int i = 31;
 430
 431                         if (!sbus_serving_map)
 432                                 sbus_serving_map = cpu_present_map;
 433                         while (!(sbus_serving_map & (1 << i)))
 434                                 i--;
 435                         sbus_tid[sbus->board] = i;
 436                         sbus_serving_map &= ~(1 << i);
 437                 }
 438         for_each_sbus(sbus) {
 439                 printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
 440                 set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
 441         }
 442 #else
 443         struct sbus_bus *sbus;
 444         int cpuid = cpu_logical_map(1);
 445
 446         if (cpuid == -1)
 447                 cpuid = cpu_logical_map(0);
 448         for_each_sbus(sbus) {
 449                 sbus_tid[sbus->board] = cpuid;
 450                 set_sbi_tid(sbus->devid, cpuid << 3);
 451         }
 452         printk("All sbus IRQs directed to CPU%d\n", cpuid);
 453 #endif
 454 }
 455 #endif
 456
 457 static void sun4d_clear_clock_irq(void)
 458 {
 459         volatile unsigned int clear_intr;
 460         clear_intr = sun4d_timers->l10_timer_limit;
 461 }
 462
 463 static void sun4d_clear_profile_irq(int cpu)
 464 {
 465         bw_get_prof_limit(cpu);
 466 }
 467
 468 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
 469 {
 470         bw_set_prof_limit(cpu, limit);
 471 }
 472
 473 static void __init sun4d_init_timers(irq_handler_t counter_fn)
 474 {
 475         int irq;
 476         int cpu;
 477         struct resource r;
 478         int mid;
 479
 480         /* Map the User Timer registers. */
 481         memset(&r, 0, sizeof(r));
 482 #ifdef CONFIG_SMP
 483         r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
 484 #else
 485         r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
 486 #endif
 487         r.flags = 0xf;
 488         sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
 489             PAGE_SIZE, "user timer");
 490
 491         sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
 492         master_l10_counter = &sun4d_timers->l10_cur_count;
 493         master_l10_limit = &sun4d_timers->l10_timer_limit;
 494
 495         irq = request_irq(TIMER_IRQ,
 496                           counter_fn,
 497                           (IRQF_DISABLED | SA_STATIC_ALLOC),
 498                           "timer", NULL);
 499         if (irq) {
 500                 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
 501                 prom_halt();
 502         }
 503
 504         /* Enable user timer free run for CPU 0 in BW */
 505         /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
 506
 507         cpu = 0;
 508         while (!cpu_find_by_instance(cpu, NULL, &mid)) {
 509                 sun4d_load_profile_irq(mid >> 3, 0);
 510                 cpu++;
 511         }
 512
 513 #ifdef CONFIG_SMP
 514         {
 515                 unsigned long flags;
 516                 extern unsigned long lvl14_save[4];
 517                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 518                 extern unsigned int real_irq_entry[], smp4d_ticker[];
 519                 extern unsigned int patchme_maybe_smp_msg[];
 520
 521                 /* Adjust so that we jump directly to smp4d_ticker */
 522                 lvl14_save[2] += smp4d_ticker - real_irq_entry;
 523
 524                 /* For SMP we use the level 14 ticker, however the bootup code
 525                  * has copied the firmwares level 14 vector into boot cpu's
 526                  * trap table, we must fix this now or we get squashed.
 527                  */
 528                 local_irq_save(flags);
 529                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
 530                 trap_table->inst_one = lvl14_save[0];
 531                 trap_table->inst_two = lvl14_save[1];
 532                 trap_table->inst_three = lvl14_save[2];
 533                 trap_table->inst_four = lvl14_save[3];
 534                 local_flush_cache_all();
 535                 local_irq_restore(flags);
 536         }
 537 #endif
 538 }
 539
 540 void __init sun4d_init_sbi_irq(void)
 541 {
 542         struct sbus_bus *sbus;
 543         unsigned mask;
 544
 545         nsbi = 0;
 546         for_each_sbus(sbus)
 547                 nsbi++;
 548         sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
 549         if (!sbus_actions) {
 550                 prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
 551                 prom_halt();
 552         }
 553         for_each_sbus(sbus) {
 554 #ifdef CONFIG_SMP
 555                 extern unsigned char boot_cpu_id;
 556
 557                 set_sbi_tid(sbus->devid, boot_cpu_id << 3);
 558                 sbus_tid[sbus->board] = boot_cpu_id;
 559 #endif
 560                 /* Get rid of pending irqs from PROM */
 561                 mask = acquire_sbi(sbus->devid, 0xffffffff);
 562                 if (mask) {
 563                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
 564                         release_sbi(sbus->devid, mask);
 565                 }
 566         }
 567 }
 568
 569 void __init sun4d_init_IRQ(void)
 570 {
 571         local_irq_disable();
 572
 573         BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
 574         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
 575         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
 576         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
 577         BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
 578         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
 579         sparc_init_timers = sun4d_init_timers;
 580 #ifdef CONFIG_SMP
 581         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
 582         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
 583         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
 584 #endif
 585         /* Cannot enable interrupts until OBP ticker is disabled. */
 586 }