arch/sparc/kernel/sun4d_irq.c

   1 /*
   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/spinlock.h>
  21 #include <linux/seq_file.h>
  22
  23 #include <asm/ptrace.h>
  24 #include <asm/processor.h>
  25 #include <asm/system.h>
  26 #include <asm/psr.h>
  27 #include <asm/smp.h>
  28 #include <asm/vaddrs.h>
  29 #include <asm/timer.h>
  30 #include <asm/openprom.h>
  31 #include <asm/oplib.h>
  32 #include <asm/traps.h>
  33 #include <asm/irq.h>
  34 #include <asm/io.h>
  35 #include <asm/pgalloc.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/sbus.h>
  38 #include <asm/sbi.h>
  39 #include <asm/cacheflush.h>
  40 #include <asm/irq_regs.h>
  41
  42 #include "irq.h"
  43
  44 /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
  45 /* #define DISTRIBUTE_IRQS */
  46
  47 struct sun4d_timer_regs *sun4d_timers;
  48 #define TIMER_IRQ       10
  49
  50 #define MAX_STATIC_ALLOC        4
  51 extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
  52 extern int static_irq_count;
  53 unsigned char cpu_leds[32];
  54 #ifdef CONFIG_SMP
  55 static unsigned char sbus_tid[32];
  56 #endif
  57
  58 static struct irqaction *irq_action[NR_IRQS];
  59 extern spinlock_t irq_action_lock;
  60
  61 static struct sbus_action {
  62         struct irqaction *action;
  63         /* For SMP this needs to be extended */
  64 } *sbus_actions;
  65
  66 static int pil_to_sbus[] = {
  67         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
  68 };
  69
  70 static int sbus_to_pil[] = {
  71         0, 2, 3, 5, 7, 9, 11, 13,
  72 };
  73
  74 static int nsbi;
  75 #ifdef CONFIG_SMP
  76 DEFINE_SPINLOCK(sun4d_imsk_lock);
  77 #endif
  78
  79 int show_sun4d_interrupts(struct seq_file *p, void *v)
  80 {
  81         int i = *(loff_t *) v, j = 0, k = 0, sbusl;
  82         struct irqaction * action;
  83         unsigned long flags;
  84 #ifdef CONFIG_SMP
  85         int x;
  86 #endif
  87
  88         spin_lock_irqsave(&irq_action_lock, flags);
  89         if (i < NR_IRQS) {
  90                 sbusl = pil_to_sbus[i];
  91                 if (!sbusl) {
  92                         action = *(i + irq_action);
  93                         if (!action)
  94                                 goto out_unlock;
  95                 } else {
  96                         for (j = 0; j < nsbi; j++) {
  97                                 for (k = 0; k < 4; k++)
  98                                         if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
  99                                                 goto found_it;
 100                         }
 101                         goto out_unlock;
 102                 }
 103 found_it:       seq_printf(p, "%3d: ", i);
 104 #ifndef CONFIG_SMP
 105                 seq_printf(p, "%10u ", kstat_irqs(i));
 106 #else
 107                 for_each_online_cpu(x)
 108                         seq_printf(p, "%10u ",
 109                                kstat_cpu(cpu_logical_map(x)).irqs[i]);
 110 #endif
 111                 seq_printf(p, "%c %s",
 112                         (action->flags & IRQF_DISABLED) ? '+' : ' ',
 113                         action->name);
 114                 action = action->next;
 115                 for (;;) {
 116                         for (; action; action = action->next) {
 117                                 seq_printf(p, ",%s %s",
 118                                         (action->flags & IRQF_DISABLED) ? " +" : "",
 119                                         action->name);
 120                         }
 121                         if (!sbusl) break;
 122                         k++;
 123                         if (k < 4)
 124                                 action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
 125                         else {
 126                                 j++;
 127                                 if (j == nsbi) break;
 128                                 k = 0;
 129                                 action = sbus_actions [(j << 5) + (sbusl << 2)].action;
 130                         }
 131                 }
 132                 seq_putc(p, '\n');
 133         }
 134 out_unlock:
 135         spin_unlock_irqrestore(&irq_action_lock, flags);
 136         return 0;
 137 }
 138
 139 void sun4d_free_irq(unsigned int irq, void *dev_id)
 140 {
 141         struct irqaction *action, **actionp;
 142         struct irqaction *tmp = NULL;
 143         unsigned long flags;
 144
 145         spin_lock_irqsave(&irq_action_lock, flags);
 146         if (irq < 15)
 147                 actionp = irq + irq_action;
 148         else
 149                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 150         action = *actionp;
 151         if (!action) {
 152                 printk("Trying to free free IRQ%d\n",irq);
 153                 goto out_unlock;
 154         }
 155         if (dev_id) {
 156                 for (; action; action = action->next) {
 157                         if (action->dev_id == dev_id)
 158                                 break;
 159                         tmp = action;
 160                 }
 161                 if (!action) {
 162                         printk("Trying to free free shared IRQ%d\n",irq);
 163                         goto out_unlock;
 164                 }
 165         } else if (action->flags & IRQF_SHARED) {
 166                 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
 167                 goto out_unlock;
 168         }
 169         if (action->flags & SA_STATIC_ALLOC)
 170         {
 171                 /* This interrupt is marked as specially allocated
 172                  * so it is a bad idea to free it.
 173                  */
 174                 printk("Attempt to free statically allocated IRQ%d (%s)\n",
 175                        irq, action->name);
 176                 goto out_unlock;
 177         }
 178
 179         if (action && tmp)
 180                 tmp->next = action->next;
 181         else
 182                 *actionp = action->next;
 183
 184         spin_unlock_irqrestore(&irq_action_lock, flags);
 185
 186         synchronize_irq(irq);
 187
 188         spin_lock_irqsave(&irq_action_lock, flags);
 189
 190         kfree(action);
 191
 192         if (!(*actionp))
 193                 __disable_irq(irq);
 194
 195 out_unlock:
 196         spin_unlock_irqrestore(&irq_action_lock, flags);
 197 }
 198
 199 extern void unexpected_irq(int, void *, struct pt_regs *);
 200
 201 void sun4d_handler_irq(int irq, struct pt_regs * regs)
 202 {
 203         struct pt_regs *old_regs;
 204         struct irqaction * action;
 205         int cpu = smp_processor_id();
 206         /* SBUS IRQ level (1 - 7) */
 207         int sbusl = pil_to_sbus[irq];
 208
 209         /* FIXME: Is this necessary?? */
 210         cc_get_ipen();
 211
 212         cc_set_iclr(1 << irq);
 213
 214         old_regs = set_irq_regs(regs);
 215         irq_enter();
 216         kstat_cpu(cpu).irqs[irq]++;
 217         if (!sbusl) {
 218                 action = *(irq + irq_action);
 219                 if (!action)
 220                         unexpected_irq(irq, NULL, regs);
 221                 do {
 222                         action->handler(irq, action->dev_id);
 223                         action = action->next;
 224                 } while (action);
 225         } else {
 226                 int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
 227                 int sbino;
 228                 struct sbus_action *actionp;
 229                 unsigned mask, slot;
 230                 int sbil = (sbusl << 2);
 231
 232                 bw_clear_intr_mask(sbusl, bus_mask);
 233
 234                 /* Loop for each pending SBI */
 235                 for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
 236                         if (bus_mask & 1) {
 237                                 mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
 238                                 mask &= (0xf << sbil);
 239                                 actionp = sbus_actions + (sbino << 5) + (sbil);
 240                                 /* Loop for each pending SBI slot */
 241                                 for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
 242                                         if (mask & slot) {
 243                                                 mask &= ~slot;
 244                                                 action = actionp->action;
 245
 246                                                 if (!action)
 247                                                         unexpected_irq(irq, NULL, regs);
 248                                                 do {
 249                                                         action->handler(irq, action->dev_id);
 250                                                         action = action->next;
 251                                                 } while (action);
 252                                                 release_sbi(SBI2DEVID(sbino), slot);
 253                                         }
 254                         }
 255         }
 256         irq_exit();
 257         set_irq_regs(old_regs);
 258 }
 259
 260 unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
 261 {
 262         int sbusl = pil_to_sbus[irq];
 263
 264         if (sbusl)
 265                 return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
 266         else
 267                 return irq;
 268 }
 269
 270 static unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev,
 271                                        unsigned int sbint)
 272 {
 273         if (sbint >= sizeof(sbus_to_pil)) {
 274                 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
 275                 BUG();
 276         }
 277         return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
 278 }
 279
 280 int sun4d_request_irq(unsigned int irq,
 281                 irq_handler_t handler,
 282                 unsigned long irqflags, const char * devname, void *dev_id)
 283 {
 284         struct irqaction *action, *tmp = NULL, **actionp;
 285         unsigned long flags;
 286         int ret;
 287
 288         if(irq > 14 && irq < (1 << 5)) {
 289                 ret = -EINVAL;
 290                 goto out;
 291         }
 292
 293         if (!handler) {
 294                 ret = -EINVAL;
 295                 goto out;
 296         }
 297
 298         spin_lock_irqsave(&irq_action_lock, flags);
 299
 300         if (irq >= (1 << 5))
 301                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 302         else
 303                 actionp = irq + irq_action;
 304         action = *actionp;
 305
 306         if (action) {
 307                 if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
 308                         for (tmp = action; tmp->next; tmp = tmp->next);
 309                 } else {
 310                         ret = -EBUSY;
 311                         goto out_unlock;
 312                 }
 313                 if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
 314                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
 315                         ret = -EBUSY;
 316                         goto out_unlock;
 317                 }
 318                 action = NULL;          /* Or else! */
 319         }
 320
 321         /* If this is flagged as statically allocated then we use our
 322          * private struct which is never freed.
 323          */
 324         if (irqflags & SA_STATIC_ALLOC) {
 325                 if (static_irq_count < MAX_STATIC_ALLOC)
 326                         action = &static_irqaction[static_irq_count++];
 327                 else
 328                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
 329         }
 330
 331         if (action == NULL)
 332                 action = kmalloc(sizeof(struct irqaction),
 333                                                      GFP_ATOMIC);
 334
 335         if (!action) {
 336                 ret = -ENOMEM;
 337                 goto out_unlock;
 338         }
 339
 340         action->handler = handler;
 341         action->flags = irqflags;
 342         cpus_clear(action->mask);
 343         action->name = devname;
 344         action->next = NULL;
 345         action->dev_id = dev_id;
 346
 347         if (tmp)
 348                 tmp->next = action;
 349         else
 350                 *actionp = action;
 351
 352         __enable_irq(irq);
 353
 354         ret = 0;
 355 out_unlock:
 356         spin_unlock_irqrestore(&irq_action_lock, flags);
 357 out:
 358         return ret;
 359 }
 360
 361 static void sun4d_disable_irq(unsigned int irq)
 362 {
 363 #ifdef CONFIG_SMP
 364         int tid = sbus_tid[(irq >> 5) - 1];
 365         unsigned long flags;
 366 #endif
 367
 368         if (irq < NR_IRQS) return;
 369 #ifdef CONFIG_SMP
 370         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 371         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
 372         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 373 #else
 374         cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
 375 #endif
 376 }
 377
 378 static void sun4d_enable_irq(unsigned int irq)
 379 {
 380 #ifdef CONFIG_SMP
 381         int tid = sbus_tid[(irq >> 5) - 1];
 382         unsigned long flags;
 383 #endif
 384
 385         if (irq < NR_IRQS) return;
 386 #ifdef CONFIG_SMP
 387         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 388         cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 389         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 390 #else
 391         cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 392 #endif
 393 }
 394
 395 #ifdef CONFIG_SMP
 396 static void sun4d_set_cpu_int(int cpu, int level)
 397 {
 398         sun4d_send_ipi(cpu, level);
 399 }
 400
 401 static void sun4d_clear_ipi(int cpu, int level)
 402 {
 403 }
 404
 405 static void sun4d_set_udt(int cpu)
 406 {
 407 }
 408
 409 /* Setup IRQ distribution scheme. */
 410 void __init sun4d_distribute_irqs(void)
 411 {
 412 #ifdef DISTRIBUTE_IRQS
 413         struct sbus_bus *sbus;
 414         unsigned long sbus_serving_map;
 415
 416         sbus_serving_map = cpu_present_map;
 417         for_each_sbus(sbus) {
 418                 if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
 419                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 420                 else if (cpu_present_map & (1 << (sbus->board * 2)))
 421                         sbus_tid[sbus->board] = (sbus->board * 2);
 422                 else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
 423                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 424                 else
 425                         sbus_tid[sbus->board] = 0xff;
 426                 if (sbus_tid[sbus->board] != 0xff)
 427                         sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
 428         }
 429         for_each_sbus(sbus)
 430                 if (sbus_tid[sbus->board] == 0xff) {
 431                         int i = 31;
 432
 433                         if (!sbus_serving_map)
 434                                 sbus_serving_map = cpu_present_map;
 435                         while (!(sbus_serving_map & (1 << i)))
 436                                 i--;
 437                         sbus_tid[sbus->board] = i;
 438                         sbus_serving_map &= ~(1 << i);
 439                 }
 440         for_each_sbus(sbus) {
 441                 printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
 442                 set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
 443         }
 444 #else
 445         struct sbus_bus *sbus;
 446         int cpuid = cpu_logical_map(1);
 447
 448         if (cpuid == -1)
 449                 cpuid = cpu_logical_map(0);
 450         for_each_sbus(sbus) {
 451                 sbus_tid[sbus->board] = cpuid;
 452                 set_sbi_tid(sbus->devid, cpuid << 3);
 453         }
 454         printk("All sbus IRQs directed to CPU%d\n", cpuid);
 455 #endif
 456 }
 457 #endif
 458
 459 static void sun4d_clear_clock_irq(void)
 460 {
 461         volatile unsigned int clear_intr;
 462         clear_intr = sun4d_timers->l10_timer_limit;
 463 }
 464
 465 static void sun4d_clear_profile_irq(int cpu)
 466 {
 467         bw_get_prof_limit(cpu);
 468 }
 469
 470 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
 471 {
 472         bw_set_prof_limit(cpu, limit);
 473 }
 474
 475 static void __init sun4d_init_timers(irq_handler_t counter_fn)
 476 {
 477         int irq;
 478         int cpu;
 479         struct resource r;
 480         int mid;
 481
 482         /* Map the User Timer registers. */
 483         memset(&r, 0, sizeof(r));
 484 #ifdef CONFIG_SMP
 485         r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
 486 #else
 487         r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
 488 #endif
 489         r.flags = 0xf;
 490         sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
 491             PAGE_SIZE, "user timer");
 492
 493         sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
 494         master_l10_counter = &sun4d_timers->l10_cur_count;
 495         master_l10_limit = &sun4d_timers->l10_timer_limit;
 496
 497         irq = request_irq(TIMER_IRQ,
 498                           counter_fn,
 499                           (IRQF_DISABLED | SA_STATIC_ALLOC),
 500                           "timer", NULL);
 501         if (irq) {
 502                 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
 503                 prom_halt();
 504         }
 505
 506         /* Enable user timer free run for CPU 0 in BW */
 507         /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
 508
 509         cpu = 0;
 510         while (!cpu_find_by_instance(cpu, NULL, &mid)) {
 511                 sun4d_load_profile_irq(mid >> 3, 0);
 512                 cpu++;
 513         }
 514
 515 #ifdef CONFIG_SMP
 516         {
 517                 unsigned long flags;
 518                 extern unsigned long lvl14_save[4];
 519                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 520                 extern unsigned int real_irq_entry[], smp4d_ticker[];
 521                 extern unsigned int patchme_maybe_smp_msg[];
 522
 523                 /* Adjust so that we jump directly to smp4d_ticker */
 524                 lvl14_save[2] += smp4d_ticker - real_irq_entry;
 525
 526                 /* For SMP we use the level 14 ticker, however the bootup code
 527                  * has copied the firmware's level 14 vector into the boot cpu's
 528                  * trap table, we must fix this now or we get squashed.
 529                  */
 530                 local_irq_save(flags);
 531                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
 532                 trap_table->inst_one = lvl14_save[0];
 533                 trap_table->inst_two = lvl14_save[1];
 534                 trap_table->inst_three = lvl14_save[2];
 535                 trap_table->inst_four = lvl14_save[3];
 536                 local_flush_cache_all();
 537                 local_irq_restore(flags);
 538         }
 539 #endif
 540 }
 541
 542 void __init sun4d_init_sbi_irq(void)
 543 {
 544         struct sbus_bus *sbus;
 545         unsigned mask;
 546
 547         nsbi = 0;
 548         for_each_sbus(sbus)
 549                 nsbi++;
 550         sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
 551         if (!sbus_actions) {
 552                 prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
 553                 prom_halt();
 554         }
 555         for_each_sbus(sbus) {
 556 #ifdef CONFIG_SMP
 557                 extern unsigned char boot_cpu_id;
 558
 559                 set_sbi_tid(sbus->devid, boot_cpu_id << 3);
 560                 sbus_tid[sbus->board] = boot_cpu_id;
 561 #endif
 562                 /* Get rid of pending irqs from PROM */
 563                 mask = acquire_sbi(sbus->devid, 0xffffffff);
 564                 if (mask) {
 565                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
 566                         release_sbi(sbus->devid, mask);
 567                 }
 568         }
 569 }
 570
 571 void __init sun4d_init_IRQ(void)
 572 {
 573         local_irq_disable();
 574
 575         BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
 576         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
 577         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
 578         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
 579         BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
 580         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
 581         sparc_init_timers = sun4d_init_timers;
 582 #ifdef CONFIG_SMP
 583         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
 584         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
 585         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
 586 #endif
 587         /* Cannot enable interrupts until OBP ticker is disabled. */
 588 }