git.oblomov.eu Git - linux-2.6/blob - 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 #include <linux/of.h>
  23 #include <linux/of_device.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/sbi.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/irq_regs.h>
  42
  43 #include "irq.h"
  44
  45 /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
  46 /* #define DISTRIBUTE_IRQS */
  47
  48 struct sun4d_timer_regs *sun4d_timers;
  49 #define TIMER_IRQ       10
  50
  51 #define MAX_STATIC_ALLOC        4
  52 extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
  53 extern int static_irq_count;
  54 unsigned char cpu_leds[32];
  55 #ifdef CONFIG_SMP
  56 static unsigned char sbus_tid[32];
  57 #endif
  58
  59 static struct irqaction *irq_action[NR_IRQS];
  60 extern spinlock_t irq_action_lock;
  61
  62 static struct sbus_action {
  63         struct irqaction *action;
  64         /* For SMP this needs to be extended */
  65 } *sbus_actions;
  66
  67 static int pil_to_sbus[] = {
  68         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
  69 };
  70
  71 static int sbus_to_pil[] = {
  72         0, 2, 3, 5, 7, 9, 11, 13,
  73 };
  74
  75 static int nsbi;
  76 #ifdef CONFIG_SMP
  77 DEFINE_SPINLOCK(sun4d_imsk_lock);
  78 #endif
  79
  80 int show_sun4d_interrupts(struct seq_file *p, void *v)
  81 {
  82         int i = *(loff_t *) v, j = 0, k = 0, sbusl;
  83         struct irqaction * action;
  84         unsigned long flags;
  85 #ifdef CONFIG_SMP
  86         int x;
  87 #endif
  88
  89         spin_lock_irqsave(&irq_action_lock, flags);
  90         if (i < NR_IRQS) {
  91                 sbusl = pil_to_sbus[i];
  92                 if (!sbusl) {
  93                         action = *(i + irq_action);
  94                         if (!action)
  95                                 goto out_unlock;
  96                 } else {
  97                         for (j = 0; j < nsbi; j++) {
  98                                 for (k = 0; k < 4; k++)
  99                                         if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
 100                                                 goto found_it;
 101                         }
 102                         goto out_unlock;
 103                 }
 104 found_it:       seq_printf(p, "%3d: ", i);
 105 #ifndef CONFIG_SMP
 106                 seq_printf(p, "%10u ", kstat_irqs(i));
 107 #else
 108                 for_each_online_cpu(x)
 109                         seq_printf(p, "%10u ",
 110                                kstat_cpu(cpu_logical_map(x)).irqs[i]);
 111 #endif
 112                 seq_printf(p, "%c %s",
 113                         (action->flags & IRQF_DISABLED) ? '+' : ' ',
 114                         action->name);
 115                 action = action->next;
 116                 for (;;) {
 117                         for (; action; action = action->next) {
 118                                 seq_printf(p, ",%s %s",
 119                                         (action->flags & IRQF_DISABLED) ? " +" : "",
 120                                         action->name);
 121                         }
 122                         if (!sbusl) break;
 123                         k++;
 124                         if (k < 4)
 125                                 action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
 126                         else {
 127                                 j++;
 128                                 if (j == nsbi) break;
 129                                 k = 0;
 130                                 action = sbus_actions [(j << 5) + (sbusl << 2)].action;
 131                         }
 132                 }
 133                 seq_putc(p, '\n');
 134         }
 135 out_unlock:
 136         spin_unlock_irqrestore(&irq_action_lock, flags);
 137         return 0;
 138 }
 139
 140 void sun4d_free_irq(unsigned int irq, void *dev_id)
 141 {
 142         struct irqaction *action, **actionp;
 143         struct irqaction *tmp = NULL;
 144         unsigned long flags;
 145
 146         spin_lock_irqsave(&irq_action_lock, flags);
 147         if (irq < 15)
 148                 actionp = irq + irq_action;
 149         else
 150                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 151         action = *actionp;
 152         if (!action) {
 153                 printk("Trying to free free IRQ%d\n",irq);
 154                 goto out_unlock;
 155         }
 156         if (dev_id) {
 157                 for (; action; action = action->next) {
 158                         if (action->dev_id == dev_id)
 159                                 break;
 160                         tmp = action;
 161                 }
 162                 if (!action) {
 163                         printk("Trying to free free shared IRQ%d\n",irq);
 164                         goto out_unlock;
 165                 }
 166         } else if (action->flags & IRQF_SHARED) {
 167                 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
 168                 goto out_unlock;
 169         }
 170         if (action->flags & SA_STATIC_ALLOC)
 171         {
 172                 /* This interrupt is marked as specially allocated
 173                  * so it is a bad idea to free it.
 174                  */
 175                 printk("Attempt to free statically allocated IRQ%d (%s)\n",
 176                        irq, action->name);
 177                 goto out_unlock;
 178         }
 179
 180         if (action && tmp)
 181                 tmp->next = action->next;
 182         else
 183                 *actionp = action->next;
 184
 185         spin_unlock_irqrestore(&irq_action_lock, flags);
 186
 187         synchronize_irq(irq);
 188
 189         spin_lock_irqsave(&irq_action_lock, flags);
 190
 191         kfree(action);
 192
 193         if (!(*actionp))
 194                 __disable_irq(irq);
 195
 196 out_unlock:
 197         spin_unlock_irqrestore(&irq_action_lock, flags);
 198 }
 199
 200 extern void unexpected_irq(int, void *, struct pt_regs *);
 201
 202 void sun4d_handler_irq(int irq, struct pt_regs * regs)
 203 {
 204         struct pt_regs *old_regs;
 205         struct irqaction * action;
 206         int cpu = smp_processor_id();
 207         /* SBUS IRQ level (1 - 7) */
 208         int sbusl = pil_to_sbus[irq];
 209
 210         /* FIXME: Is this necessary?? */
 211         cc_get_ipen();
 212
 213         cc_set_iclr(1 << irq);
 214
 215         old_regs = set_irq_regs(regs);
 216         irq_enter();
 217         kstat_cpu(cpu).irqs[irq]++;
 218         if (!sbusl) {
 219                 action = *(irq + irq_action);
 220                 if (!action)
 221                         unexpected_irq(irq, NULL, regs);
 222                 do {
 223                         action->handler(irq, action->dev_id);
 224                         action = action->next;
 225                 } while (action);
 226         } else {
 227                 int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
 228                 int sbino;
 229                 struct sbus_action *actionp;
 230                 unsigned mask, slot;
 231                 int sbil = (sbusl << 2);
 232
 233                 bw_clear_intr_mask(sbusl, bus_mask);
 234
 235                 /* Loop for each pending SBI */
 236                 for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
 237                         if (bus_mask & 1) {
 238                                 mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
 239                                 mask &= (0xf << sbil);
 240                                 actionp = sbus_actions + (sbino << 5) + (sbil);
 241                                 /* Loop for each pending SBI slot */
 242                                 for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
 243                                         if (mask & slot) {
 244                                                 mask &= ~slot;
 245                                                 action = actionp->action;
 246
 247                                                 if (!action)
 248                                                         unexpected_irq(irq, NULL, regs);
 249                                                 do {
 250                                                         action->handler(irq, action->dev_id);
 251                                                         action = action->next;
 252                                                 } while (action);
 253                                                 release_sbi(SBI2DEVID(sbino), slot);
 254                                         }
 255                         }
 256         }
 257         irq_exit();
 258         set_irq_regs(old_regs);
 259 }
 260
 261 int sun4d_request_irq(unsigned int irq,
 262                 irq_handler_t handler,
 263                 unsigned long irqflags, const char * devname, void *dev_id)
 264 {
 265         struct irqaction *action, *tmp = NULL, **actionp;
 266         unsigned long flags;
 267         int ret;
 268
 269         if(irq > 14 && irq < (1 << 5)) {
 270                 ret = -EINVAL;
 271                 goto out;
 272         }
 273
 274         if (!handler) {
 275                 ret = -EINVAL;
 276                 goto out;
 277         }
 278
 279         spin_lock_irqsave(&irq_action_lock, flags);
 280
 281         if (irq >= (1 << 5))
 282                 actionp = &(sbus_actions[irq - (1 << 5)].action);
 283         else
 284                 actionp = irq + irq_action;
 285         action = *actionp;
 286
 287         if (action) {
 288                 if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
 289                         for (tmp = action; tmp->next; tmp = tmp->next);
 290                 } else {
 291                         ret = -EBUSY;
 292                         goto out_unlock;
 293                 }
 294                 if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
 295                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
 296                         ret = -EBUSY;
 297                         goto out_unlock;
 298                 }
 299                 action = NULL;          /* Or else! */
 300         }
 301
 302         /* If this is flagged as statically allocated then we use our
 303          * private struct which is never freed.
 304          */
 305         if (irqflags & SA_STATIC_ALLOC) {
 306                 if (static_irq_count < MAX_STATIC_ALLOC)
 307                         action = &static_irqaction[static_irq_count++];
 308                 else
 309                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
 310         }
 311
 312         if (action == NULL)
 313                 action = kmalloc(sizeof(struct irqaction),
 314                                                      GFP_ATOMIC);
 315
 316         if (!action) {
 317                 ret = -ENOMEM;
 318                 goto out_unlock;
 319         }
 320
 321         action->handler = handler;
 322         action->flags = irqflags;
 323         cpus_clear(action->mask);
 324         action->name = devname;
 325         action->next = NULL;
 326         action->dev_id = dev_id;
 327
 328         if (tmp)
 329                 tmp->next = action;
 330         else
 331                 *actionp = action;
 332
 333         __enable_irq(irq);
 334
 335         ret = 0;
 336 out_unlock:
 337         spin_unlock_irqrestore(&irq_action_lock, flags);
 338 out:
 339         return ret;
 340 }
 341
 342 static void sun4d_disable_irq(unsigned int irq)
 343 {
 344 #ifdef CONFIG_SMP
 345         int tid = sbus_tid[(irq >> 5) - 1];
 346         unsigned long flags;
 347 #endif
 348
 349         if (irq < NR_IRQS) return;
 350 #ifdef CONFIG_SMP
 351         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 352         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
 353         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 354 #else
 355         cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
 356 #endif
 357 }
 358
 359 static void sun4d_enable_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 #ifdef CONFIG_SMP
 377 static void sun4d_set_cpu_int(int cpu, int level)
 378 {
 379         sun4d_send_ipi(cpu, level);
 380 }
 381
 382 static void sun4d_clear_ipi(int cpu, int level)
 383 {
 384 }
 385
 386 static void sun4d_set_udt(int cpu)
 387 {
 388 }
 389
 390 /* Setup IRQ distribution scheme. */
 391 void __init sun4d_distribute_irqs(void)
 392 {
 393         struct device_node *dp;
 394
 395 #ifdef DISTRIBUTE_IRQS
 396         cpumask_t sbus_serving_map;
 397
 398         sbus_serving_map = cpu_present_map;
 399         for_each_node_by_name(dp, "sbi") {
 400                 int board = of_getintprop_default(dp, "board#", 0);
 401
 402                 if ((board * 2) == boot_cpu_id && cpu_isset(board * 2 + 1, cpu_present_map))
 403                         sbus_tid[board] = (board * 2 + 1);
 404                 else if (cpu_isset(board * 2, cpu_present_map))
 405                         sbus_tid[board] = (board * 2);
 406                 else if (cpu_isset(board * 2 + 1, cpu_present_map))
 407                         sbus_tid[board] = (board * 2 + 1);
 408                 else
 409                         sbus_tid[board] = 0xff;
 410                 if (sbus_tid[board] != 0xff)
 411                         cpu_clear(sbus_tid[board], sbus_serving_map);
 412         }
 413         for_each_node_by_name(dp, "sbi") {
 414                 int board = of_getintprop_default(dp, "board#", 0);
 415                 if (sbus_tid[board] == 0xff) {
 416                         int i = 31;
 417
 418                         if (cpus_empty(sbus_serving_map))
 419                                 sbus_serving_map = cpu_present_map;
 420                         while (cpu_isset(i, sbus_serving_map))
 421                                 i--;
 422                         sbus_tid[board] = i;
 423                         cpu_clear(i, sbus_serving_map);
 424                 }
 425         }
 426         for_each_node_by_name(dp, "sbi") {
 427                 int devid = of_getintprop_default(dp, "device-id", 0);
 428                 int board = of_getintprop_default(dp, "board#", 0);
 429                 printk("sbus%d IRQs directed to CPU%d\n", board, sbus_tid[board]);
 430                 set_sbi_tid(devid, sbus_tid[board] << 3);
 431         }
 432 #else
 433         int cpuid = cpu_logical_map(1);
 434
 435         if (cpuid == -1)
 436                 cpuid = cpu_logical_map(0);
 437         for_each_node_by_name(dp, "sbi") {
 438                 int devid = of_getintprop_default(dp, "device-id", 0);
 439                 int board = of_getintprop_default(dp, "board#", 0);
 440                 sbus_tid[board] = cpuid;
 441                 set_sbi_tid(devid, cpuid << 3);
 442         }
 443         printk("All sbus IRQs directed to CPU%d\n", cpuid);
 444 #endif
 445 }
 446 #endif
 447
 448 static void sun4d_clear_clock_irq(void)
 449 {
 450         volatile unsigned int clear_intr;
 451         clear_intr = sun4d_timers->l10_timer_limit;
 452 }
 453
 454 static void sun4d_clear_profile_irq(int cpu)
 455 {
 456         bw_get_prof_limit(cpu);
 457 }
 458
 459 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
 460 {
 461         bw_set_prof_limit(cpu, limit);
 462 }
 463
 464 static void __init sun4d_init_timers(irq_handler_t counter_fn)
 465 {
 466         int irq;
 467         int cpu;
 468         struct resource r;
 469         int mid;
 470
 471         /* Map the User Timer registers. */
 472         memset(&r, 0, sizeof(r));
 473 #ifdef CONFIG_SMP
 474         r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
 475 #else
 476         r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
 477 #endif
 478         r.flags = 0xf;
 479         sun4d_timers = (struct sun4d_timer_regs *) of_ioremap(&r, 0,
 480             PAGE_SIZE, "user timer");
 481
 482         sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
 483         master_l10_counter = &sun4d_timers->l10_cur_count;
 484         master_l10_limit = &sun4d_timers->l10_timer_limit;
 485
 486         irq = request_irq(TIMER_IRQ,
 487                           counter_fn,
 488                           (IRQF_DISABLED | SA_STATIC_ALLOC),
 489                           "timer", NULL);
 490         if (irq) {
 491                 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
 492                 prom_halt();
 493         }
 494
 495         /* Enable user timer free run for CPU 0 in BW */
 496         /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
 497
 498         cpu = 0;
 499         while (!cpu_find_by_instance(cpu, NULL, &mid)) {
 500                 sun4d_load_profile_irq(mid >> 3, 0);
 501                 cpu++;
 502         }
 503
 504 #ifdef CONFIG_SMP
 505         {
 506                 unsigned long flags;
 507                 extern unsigned long lvl14_save[4];
 508                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 509                 extern unsigned int real_irq_entry[], smp4d_ticker[];
 510                 extern unsigned int patchme_maybe_smp_msg[];
 511
 512                 /* Adjust so that we jump directly to smp4d_ticker */
 513                 lvl14_save[2] += smp4d_ticker - real_irq_entry;
 514
 515                 /* For SMP we use the level 14 ticker, however the bootup code
 516                  * has copied the firmware's level 14 vector into the boot cpu's
 517                  * trap table, we must fix this now or we get squashed.
 518                  */
 519                 local_irq_save(flags);
 520                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
 521                 trap_table->inst_one = lvl14_save[0];
 522                 trap_table->inst_two = lvl14_save[1];
 523                 trap_table->inst_three = lvl14_save[2];
 524                 trap_table->inst_four = lvl14_save[3];
 525                 local_flush_cache_all();
 526                 local_irq_restore(flags);
 527         }
 528 #endif
 529 }
 530
 531 void __init sun4d_init_sbi_irq(void)
 532 {
 533         struct device_node *dp;
 534
 535         nsbi = 0;
 536         for_each_node_by_name(dp, "sbi")
 537                 nsbi++;
 538         sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
 539         if (!sbus_actions) {
 540                 prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
 541                 prom_halt();
 542         }
 543         for_each_node_by_name(dp, "sbi") {
 544                 int devid = of_getintprop_default(dp, "device-id", 0);
 545                 int board = of_getintprop_default(dp, "board#", 0);
 546                 unsigned int mask;
 547
 548 #ifdef CONFIG_SMP
 549                 {
 550                         extern unsigned char boot_cpu_id;
 551
 552                         set_sbi_tid(devid, boot_cpu_id << 3);
 553                         sbus_tid[board] = boot_cpu_id;
 554                 }
 555 #endif
 556                 /* Get rid of pending irqs from PROM */
 557                 mask = acquire_sbi(devid, 0xffffffff);
 558                 if (mask) {
 559                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, board);
 560                         release_sbi(devid, mask);
 561                 }
 562         }
 563 }
 564
 565 void __init sun4d_init_IRQ(void)
 566 {
 567         local_irq_disable();
 568
 569         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
 570         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
 571         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
 572         BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
 573         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
 574         sparc_init_timers = sun4d_init_timers;
 575 #ifdef CONFIG_SMP
 576         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
 577         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
 578         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
 579 #endif
 580         /* Cannot enable interrupts until OBP ticker is disabled. */
 581 }