1/* $Id: sun4d_irq.c,v 1.1.1.1 2007/08/03 18:52:17 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/* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */ 43/* #define DISTRIBUTE_IRQS */ 44 45struct sun4d_timer_regs *sun4d_timers; 46#define TIMER_IRQ 10 47 48#define MAX_STATIC_ALLOC 4 49extern struct irqaction static_irqaction[MAX_STATIC_ALLOC]; 50extern int static_irq_count; 51unsigned char cpu_leds[32]; 52#ifdef CONFIG_SMP 53unsigned char sbus_tid[32]; 54#endif 55 56static struct irqaction *irq_action[NR_IRQS]; 57extern spinlock_t irq_action_lock; 58 59struct sbus_action { 60 struct irqaction *action; 61 /* For SMP this needs to be extended */ 62} *sbus_actions; 63 64static int pil_to_sbus[] = { 65 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0, 66}; 67 68static int sbus_to_pil[] = { 69 0, 2, 3, 5, 7, 9, 11, 13, 70}; 71 72static int nsbi; 73#ifdef CONFIG_SMP 74DEFINE_SPINLOCK(sun4d_imsk_lock); 75#endif 76 77int show_sun4d_interrupts(struct seq_file *p, void *v) 78{ 79 int i = *(loff_t *) v, j = 0, k = 0, sbusl; 80 struct irqaction * action; 81 unsigned long flags; 82#ifdef CONFIG_SMP 83 int x; 84#endif 85 86 spin_lock_irqsave(&irq_action_lock, flags); 87 if (i < NR_IRQS) { 88 sbusl = pil_to_sbus[i]; 89 if (!sbusl) { 90 action = *(i + irq_action); 91 if (!action) 92 goto out_unlock; 93 } else { 94 for (j = 0; j < nsbi; j++) { 95 for (k = 0; k < 4; k++) 96 if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action)) 97 goto found_it; 98 } 99 goto out_unlock; 100 } 101found_it: seq_printf(p, "%3d: ", i); 102#ifndef CONFIG_SMP 103 seq_printf(p, "%10u ", kstat_irqs(i)); 104#else 105 for_each_online_cpu(x) 106 seq_printf(p, "%10u ", 107 kstat_cpu(cpu_logical_map(x)).irqs[i]); 108#endif 109 seq_printf(p, "%c %s", 110 (action->flags & IRQF_DISABLED) ? '+' : ' ', 111 action->name); 112 action = action->next; 113 for (;;) { 114 for (; action; action = action->next) { 115 seq_printf(p, ",%s %s", 116 (action->flags & IRQF_DISABLED) ? " +" : "", 117 action->name); 118 } 119 if (!sbusl) break; 120 k++; 121 if (k < 4) 122 action = sbus_actions [(j << 5) + (sbusl << 2) + k].action; 123 else { 124 j++; 125 if (j == nsbi) break; 126 k = 0; 127 action = sbus_actions [(j << 5) + (sbusl << 2)].action; 128 } 129 } 130 seq_putc(p, '\n'); 131 } 132out_unlock: 133 spin_unlock_irqrestore(&irq_action_lock, flags); 134 return 0; 135} 136 137void sun4d_free_irq(unsigned int irq, void *dev_id) 138{ 139 struct irqaction *action, **actionp; 140 struct irqaction *tmp = NULL; 141 unsigned long flags; 142 143 spin_lock_irqsave(&irq_action_lock, flags); 144 if (irq < 15) 145 actionp = irq + irq_action; 146 else 147 actionp = &(sbus_actions[irq - (1 << 5)].action); 148 action = *actionp; 149 if (!action) { 150 printk("Trying to free free IRQ%d\n",irq); 151 goto out_unlock; 152 } 153 if (dev_id) { 154 for (; action; action = action->next) { 155 if (action->dev_id == dev_id) 156 break; 157 tmp = action; 158 } 159 if (!action) { 160 printk("Trying to free free shared IRQ%d\n",irq); 161 goto out_unlock; 162 } 163 } else if (action->flags & IRQF_SHARED) { 164 printk("Trying to free shared IRQ%d with NULL device ID\n", irq); 165 goto out_unlock; 166 } 167 if (action->flags & SA_STATIC_ALLOC) 168 { 169 /* This interrupt is marked as specially allocated 170 * so it is a bad idea to free it. 171 */ 172 printk("Attempt to free statically allocated IRQ%d (%s)\n", 173 irq, action->name); 174 goto out_unlock; 175 } 176 177 if (action && tmp) 178 tmp->next = action->next; 179 else 180 *actionp = action->next; 181 182 spin_unlock_irqrestore(&irq_action_lock, flags); 183 184 synchronize_irq(irq); 185 186 spin_lock_irqsave(&irq_action_lock, flags); 187 188 kfree(action); 189 190 if (!(*actionp)) 191 disable_irq(irq); 192 193out_unlock: 194 spin_unlock_irqrestore(&irq_action_lock, flags); 195} 196 197extern void unexpected_irq(int, void *, struct pt_regs *); 198 199void sun4d_handler_irq(int irq, struct pt_regs * regs) 200{ 201 struct pt_regs *old_regs; 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 cc_get_ipen(); 208 209 cc_set_iclr(1 << irq); 210 211 old_regs = set_irq_regs(regs); 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); 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); 247 action = action->next; 248 } while (action); 249 release_sbi(SBI2DEVID(sbino), slot); 250 } 251 } 252 } 253 irq_exit(); 254 set_irq_regs(old_regs); 255} 256 257unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq) 258{ 259 int sbusl = pil_to_sbus[irq]; 260 261 if (sbusl) 262 return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot; 263 else 264 return irq; 265} 266 267unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint) 268{ 269 if (sbint >= sizeof(sbus_to_pil)) { 270 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint); 271 BUG(); 272 } 273 return sun4d_build_irq(sdev, sbus_to_pil[sbint]); 274} 275 276int sun4d_request_irq(unsigned int irq, 277 irq_handler_t handler, 278 unsigned long irqflags, const char * devname, void *dev_id) 279{ 280 struct irqaction *action, *tmp = NULL, **actionp; 281 unsigned long flags; 282 int ret; 283 284 if(irq > 14 && irq < (1 << 5)) { 285 ret = -EINVAL; 286 goto out; 287 } 288 289 if (!handler) { 290 ret = -EINVAL; 291 goto out; 292 } 293 294 spin_lock_irqsave(&irq_action_lock, flags); 295 296 if (irq >= (1 << 5)) 297 actionp = &(sbus_actions[irq - (1 << 5)].action); 298 else 299 actionp = irq + irq_action; 300 action = *actionp; 301 302 if (action) { 303 if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) { 304 for (tmp = action; tmp->next; tmp = tmp->next); 305 } else { 306 ret = -EBUSY; 307 goto out_unlock; 308 } 309 if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) { 310 printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq); 311 ret = -EBUSY; 312 goto out_unlock; 313 } 314 action = NULL; /* Or else! */ 315 } 316 317 /* If this is flagged as statically allocated then we use our 318 * private struct which is never freed. 319 */ 320 if (irqflags & SA_STATIC_ALLOC) { 321 if (static_irq_count < MAX_STATIC_ALLOC) 322 action = &static_irqaction[static_irq_count++]; 323 else 324 printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname); 325 } 326 327 if (action == NULL) 328 action = kmalloc(sizeof(struct irqaction), 329 GFP_ATOMIC); 330 331 if (!action) { 332 ret = -ENOMEM; 333 goto out_unlock; 334 } 335 336 action->handler = handler; 337 action->flags = irqflags; 338 cpus_clear(action->mask); 339 action->name = devname; 340 action->next = NULL; 341 action->dev_id = dev_id; 342 343 if (tmp) 344 tmp->next = action; 345 else 346 *actionp = action; 347 348 enable_irq(irq); 349 350 ret = 0; 351out_unlock: 352 spin_unlock_irqrestore(&irq_action_lock, flags); 353out: 354 return ret; 355} 356 357static void sun4d_disable_irq(unsigned int irq) 358{ 359#ifdef CONFIG_SMP 360 int tid = sbus_tid[(irq >> 5) - 1]; 361 unsigned long flags; 362#endif 363 364 if (irq < NR_IRQS) return; 365#ifdef CONFIG_SMP 366 spin_lock_irqsave(&sun4d_imsk_lock, flags); 367 cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7])); 368 spin_unlock_irqrestore(&sun4d_imsk_lock, flags); 369#else 370 cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7])); 371#endif 372} 373 374static void sun4d_enable_irq(unsigned int irq) 375{ 376#ifdef CONFIG_SMP 377 int tid = sbus_tid[(irq >> 5) - 1]; 378 unsigned long flags; 379#endif 380 381 if (irq < NR_IRQS) return; 382#ifdef CONFIG_SMP 383 spin_lock_irqsave(&sun4d_imsk_lock, flags); 384 cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7])); 385 spin_unlock_irqrestore(&sun4d_imsk_lock, flags); 386#else 387 cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7])); 388#endif 389} 390 391#ifdef CONFIG_SMP 392static void sun4d_set_cpu_int(int cpu, int level) 393{ 394 sun4d_send_ipi(cpu, level); 395} 396 397static void sun4d_clear_ipi(int cpu, int level) 398{ 399} 400 401static void sun4d_set_udt(int cpu) 402{ 403} 404 405/* Setup IRQ distribution scheme. */ 406void __init sun4d_distribute_irqs(void) 407{ 408#ifdef DISTRIBUTE_IRQS 409 struct sbus_bus *sbus; 410 unsigned long sbus_serving_map; 411 412 sbus_serving_map = cpu_present_map; 413 for_each_sbus(sbus) { 414 if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1)))) 415 sbus_tid[sbus->board] = (sbus->board * 2 + 1); 416 else if (cpu_present_map & (1 << (sbus->board * 2))) 417 sbus_tid[sbus->board] = (sbus->board * 2); 418 else if (cpu_present_map & (1 << (sbus->board * 2 + 1))) 419 sbus_tid[sbus->board] = (sbus->board * 2 + 1); 420 else 421 sbus_tid[sbus->board] = 0xff; 422 if (sbus_tid[sbus->board] != 0xff) 423 sbus_serving_map &= ~(1 << sbus_tid[sbus->board]); 424 } 425 for_each_sbus(sbus) 426 if (sbus_tid[sbus->board] == 0xff) { 427 int i = 31; 428 429 if (!sbus_serving_map) 430 sbus_serving_map = cpu_present_map; 431 while (!(sbus_serving_map & (1 << i))) 432 i--; 433 sbus_tid[sbus->board] = i; 434 sbus_serving_map &= ~(1 << i); 435 } 436 for_each_sbus(sbus) { 437 printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]); 438 set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3); 439 } 440#else 441 struct sbus_bus *sbus; 442 int cpuid = cpu_logical_map(1); 443 444 if (cpuid == -1) 445 cpuid = cpu_logical_map(0); 446 for_each_sbus(sbus) { 447 sbus_tid[sbus->board] = cpuid; 448 set_sbi_tid(sbus->devid, cpuid << 3); 449 } 450 printk("All sbus IRQs directed to CPU%d\n", cpuid); 451#endif 452} 453#endif 454 455static void sun4d_clear_clock_irq(void) 456{ 457 volatile unsigned int clear_intr; 458 clear_intr = sun4d_timers->l10_timer_limit; 459} 460 461static void sun4d_clear_profile_irq(int cpu) 462{ 463 bw_get_prof_limit(cpu); 464} 465 466static void sun4d_load_profile_irq(int cpu, unsigned int limit) 467{ 468 bw_set_prof_limit(cpu, limit); 469} 470 471static void __init sun4d_init_timers(irq_handler_t counter_fn) 472{ 473 int irq; 474 int cpu; 475 struct resource r; 476 int mid; 477 478 /* Map the User Timer registers. */ 479 memset(&r, 0, sizeof(r)); 480#ifdef CONFIG_SMP 481 r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT; 482#else 483 r.start = CSR_BASE(0)+BW_TIMER_LIMIT; 484#endif 485 r.flags = 0xf; 486 sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0, 487 PAGE_SIZE, "user timer"); 488 489 sun4d_timers->l10_timer_limit = (((1000000/HZ) + 1) << 10); 490 master_l10_counter = &sun4d_timers->l10_cur_count; 491 master_l10_limit = &sun4d_timers->l10_timer_limit; 492 493 irq = request_irq(TIMER_IRQ, 494 counter_fn, 495 (IRQF_DISABLED | SA_STATIC_ALLOC), 496 "timer", NULL); 497 if (irq) { 498 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ); 499 prom_halt(); 500 } 501 502 /* Enable user timer free run for CPU 0 in BW */ 503 /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */ 504 505 cpu = 0; 506 while (!cpu_find_by_instance(cpu, NULL, &mid)) { 507 sun4d_load_profile_irq(mid >> 3, 0); 508 cpu++; 509 } 510 511#ifdef CONFIG_SMP 512 { 513 unsigned long flags; 514 extern unsigned long lvl14_save[4]; 515 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)]; 516 extern unsigned int real_irq_entry[], smp4d_ticker[]; 517 extern unsigned int patchme_maybe_smp_msg[]; 518 519 /* Adjust so that we jump directly to smp4d_ticker */ 520 lvl14_save[2] += smp4d_ticker - real_irq_entry; 521 522 /* For SMP we use the level 14 ticker, however the bootup code 523 * has copied the firmware's level 14 vector into the boot cpu's 524 * trap table, we must fix this now or we get squashed. 525 */ 526 local_irq_save(flags); 527 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */ 528 trap_table->inst_one = lvl14_save[0]; 529 trap_table->inst_two = lvl14_save[1]; 530 trap_table->inst_three = lvl14_save[2]; 531 trap_table->inst_four = lvl14_save[3]; 532 local_flush_cache_all(); 533 local_irq_restore(flags); 534 } 535#endif 536} 537 538void __init sun4d_init_sbi_irq(void) 539{ 540 struct sbus_bus *sbus; 541 unsigned mask; 542 543 nsbi = 0; 544 for_each_sbus(sbus) 545 nsbi++; 546 sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC); 547 if (!sbus_actions) { 548 prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n"); 549 prom_halt(); 550 } 551 for_each_sbus(sbus) { 552#ifdef CONFIG_SMP 553 extern unsigned char boot_cpu_id; 554 555 set_sbi_tid(sbus->devid, boot_cpu_id << 3); 556 sbus_tid[sbus->board] = boot_cpu_id; 557#endif 558 /* Get rid of pending irqs from PROM */ 559 mask = acquire_sbi(sbus->devid, 0xffffffff); 560 if (mask) { 561 printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board); 562 release_sbi(sbus->devid, mask); 563 } 564 } 565} 566 567void __init sun4d_init_IRQ(void) 568{ 569 local_irq_disable(); 570 571 BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM); 572 BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM); 573 BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM); 574 BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM); 575 BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM); 576 BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM); 577 sparc_init_timers = sun4d_init_timers; 578#ifdef CONFIG_SMP 579 BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM); 580 BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP); 581 BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP); 582#endif 583 /* Cannot enable interrupts until OBP ticker is disabled. */ 584} 585