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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/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 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 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 unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
 271 {
 272         if (sbint >= sizeof(sbus_to_pil)) {
 273                 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
 274                 BUG();
 275         }
 276         return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
 277 }
 278
 279 int sun4d_request_irq(unsigned int irq,
 280                 irq_handler_t handler,
 281                 unsigned long irqflags, const char * devname, void *dev_id)
 282 {
 283         struct irqaction *action, *tmp = NULL, **actionp;
 284         unsigned long flags;
 285         int ret;
 286
 287         if(irq > 14 && irq < (1 << 5)) {
 288                 ret = -EINVAL;
 289                 goto out;
 290         }
 291
 292         if (!handler) {
 293                 ret = -EINVAL;
 294                 goto out;
 295         }
 296
 297         spin_lock_irqsave(&irq_action_lock, flags);
 298
 299         if (irq >= (1 << 5))
 300                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 301         else
 302                 actionp = irq + irq_action;
 303         action = *actionp;
 304
 305         if (action) {
 306                 if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
 307                         for (tmp = action; tmp->next; tmp = tmp->next);
 308                 } else {
 309                         ret = -EBUSY;
 310                         goto out_unlock;
 311                 }
 312                 if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
 313                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
 314                         ret = -EBUSY;
 315                         goto out_unlock;
 316                 }
 317                 action = NULL;          /* Or else! */
 318         }
 319
 320         /* If this is flagged as statically allocated then we use our
 321          * private struct which is never freed.
 322          */
 323         if (irqflags & SA_STATIC_ALLOC) {
 324                 if (static_irq_count < MAX_STATIC_ALLOC)
 325                         action = &static_irqaction[static_irq_count++];
 326                 else
 327                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
 328         }
 329
 330         if (action == NULL)
 331                 action = kmalloc(sizeof(struct irqaction),
 332                                                      GFP_ATOMIC);
 333
 334         if (!action) {
 335                 ret = -ENOMEM;
 336                 goto out_unlock;
 337         }
 338
 339         action->handler = handler;
 340         action->flags = irqflags;
 341         cpus_clear(action->mask);
 342         action->name = devname;
 343         action->next = NULL;
 344         action->dev_id = dev_id;
 345
 346         if (tmp)
 347                 tmp->next = action;
 348         else
 349                 *actionp = action;
 350
 351         __enable_irq(irq);
 352
 353         ret = 0;
 354 out_unlock:
 355         spin_unlock_irqrestore(&irq_action_lock, flags);
 356 out:
 357         return ret;
 358 }
 359
 360 static void sun4d_disable_irq(unsigned int irq)
 361 {
 362 #ifdef CONFIG_SMP
 363         int tid = sbus_tid[(irq >> 5) - 1];
 364         unsigned long flags;
 365 #endif
 366
 367         if (irq < NR_IRQS) return;
 368 #ifdef CONFIG_SMP
 369         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 370         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
 371         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 372 #else
 373         cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
 374 #endif
 375 }
 376
 377 static void sun4d_enable_irq(unsigned int irq)
 378 {
 379 #ifdef CONFIG_SMP
 380         int tid = sbus_tid[(irq >> 5) - 1];
 381         unsigned long flags;
 382 #endif
 383
 384         if (irq < NR_IRQS) return;
 385 #ifdef CONFIG_SMP
 386         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 387         cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 388         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 389 #else
 390         cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 391 #endif
 392 }
 393
 394 #ifdef CONFIG_SMP
 395 static void sun4d_set_cpu_int(int cpu, int level)
 396 {
 397         sun4d_send_ipi(cpu, level);
 398 }
 399
 400 static void sun4d_clear_ipi(int cpu, int level)
 401 {
 402 }
 403
 404 static void sun4d_set_udt(int cpu)
 405 {
 406 }
 407
 408 /* Setup IRQ distribution scheme. */
 409 void __init sun4d_distribute_irqs(void)
 410 {
 411 #ifdef DISTRIBUTE_IRQS
 412         struct sbus_bus *sbus;
 413         unsigned long sbus_serving_map;
 414
 415         sbus_serving_map = cpu_present_map;
 416         for_each_sbus(sbus) {
 417                 if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
 418                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 419                 else if (cpu_present_map & (1 << (sbus->board * 2)))
 420                         sbus_tid[sbus->board] = (sbus->board * 2);
 421                 else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
 422                         sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 423                 else
 424                         sbus_tid[sbus->board] = 0xff;
 425                 if (sbus_tid[sbus->board] != 0xff)
 426                         sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
 427         }
 428         for_each_sbus(sbus)
 429                 if (sbus_tid[sbus->board] == 0xff) {
 430                         int i = 31;
 431
 432                         if (!sbus_serving_map)
 433                                 sbus_serving_map = cpu_present_map;
 434                         while (!(sbus_serving_map & (1 << i)))
 435                                 i--;
 436                         sbus_tid[sbus->board] = i;
 437                         sbus_serving_map &= ~(1 << i);
 438                 }
 439         for_each_sbus(sbus) {
 440                 printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
 441                 set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
 442         }
 443 #else
 444         struct sbus_bus *sbus;
 445         int cpuid = cpu_logical_map(1);
 446
 447         if (cpuid == -1)
 448                 cpuid = cpu_logical_map(0);
 449         for_each_sbus(sbus) {
 450                 sbus_tid[sbus->board] = cpuid;
 451                 set_sbi_tid(sbus->devid, cpuid << 3);
 452         }
 453         printk("All sbus IRQs directed to CPU%d\n", cpuid);
 454 #endif
 455 }
 456 #endif
 457
 458 static void sun4d_clear_clock_irq(void)
 459 {
 460         volatile unsigned int clear_intr;
 461         clear_intr = sun4d_timers->l10_timer_limit;
 462 }
 463
 464 static void sun4d_clear_profile_irq(int cpu)
 465 {
 466         bw_get_prof_limit(cpu);
 467 }
 468
 469 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
 470 {
 471         bw_set_prof_limit(cpu, limit);
 472 }
 473
 474 static void __init sun4d_init_timers(irq_handler_t counter_fn)
 475 {
 476         int irq;
 477         int cpu;
 478         struct resource r;
 479         int mid;
 480
 481         /* Map the User Timer registers. */
 482         memset(&r, 0, sizeof(r));
 483 #ifdef CONFIG_SMP
 484         r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
 485 #else
 486         r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
 487 #endif
 488         r.flags = 0xf;
 489         sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
 490             PAGE_SIZE, "user timer");
 491
 492         sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
 493         master_l10_counter = &sun4d_timers->l10_cur_count;
 494         master_l10_limit = &sun4d_timers->l10_timer_limit;
 495
 496         irq = request_irq(TIMER_IRQ,
 497                           counter_fn,
 498                           (IRQF_DISABLED | SA_STATIC_ALLOC),
 499                           "timer", NULL);
 500         if (irq) {
 501                 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
 502                 prom_halt();
 503         }
 504
 505         /* Enable user timer free run for CPU 0 in BW */
 506         /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
 507
 508         cpu = 0;
 509         while (!cpu_find_by_instance(cpu, NULL, &mid)) {
 510                 sun4d_load_profile_irq(mid >> 3, 0);
 511                 cpu++;
 512         }
 513
 514 #ifdef CONFIG_SMP
 515         {
 516                 unsigned long flags;
 517                 extern unsigned long lvl14_save[4];
 518                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 519                 extern unsigned int real_irq_entry[], smp4d_ticker[];
 520                 extern unsigned int patchme_maybe_smp_msg[];
 521
 522                 /* Adjust so that we jump directly to smp4d_ticker */
 523                 lvl14_save[2] += smp4d_ticker - real_irq_entry;
 524
 525                 /* For SMP we use the level 14 ticker, however the bootup code
 526                  * has copied the firmware's level 14 vector into the boot cpu's
 527                  * trap table, we must fix this now or we get squashed.
 528                  */
 529                 local_irq_save(flags);
 530                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
 531                 trap_table->inst_one = lvl14_save[0];
 532                 trap_table->inst_two = lvl14_save[1];
 533                 trap_table->inst_three = lvl14_save[2];
 534                 trap_table->inst_four = lvl14_save[3];
 535                 local_flush_cache_all();
 536                 local_irq_restore(flags);
 537         }
 538 #endif
 539 }
 540
 541 void __init sun4d_init_sbi_irq(void)
 542 {
 543         struct sbus_bus *sbus;
 544         unsigned mask;
 545
 546         nsbi = 0;
 547         for_each_sbus(sbus)
 548                 nsbi++;
 549         sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
 550         if (!sbus_actions) {
 551                 prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
 552                 prom_halt();
 553         }
 554         for_each_sbus(sbus) {
 555 #ifdef CONFIG_SMP
 556                 extern unsigned char boot_cpu_id;
 557
 558                 set_sbi_tid(sbus->devid, boot_cpu_id << 3);
 559                 sbus_tid[sbus->board] = boot_cpu_id;
 560 #endif
 561                 /* Get rid of pending irqs from PROM */
 562                 mask = acquire_sbi(sbus->devid, 0xffffffff);
 563                 if (mask) {
 564                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
 565                         release_sbi(sbus->devid, mask);
 566                 }
 567         }
 568 }
 569
 570 void __init sun4d_init_IRQ(void)
 571 {
 572         local_irq_disable();
 573
 574         BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
 575         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
 576         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
 577         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
 578         BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
 579         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
 580         sparc_init_timers = sun4d_init_timers;
 581 #ifdef CONFIG_SMP
 582         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
 583         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
 584         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
 585 #endif
 586         /* Cannot enable interrupts until OBP ticker is disabled. */
 587 }