Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* irq.c: FRV IRQ handling |
| 2 | * |
| 3 | * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * (mostly architecture independent, will move to kernel/irq.c in 2.5.) |
| 14 | * |
| 15 | * IRQs are in fact implemented a bit like signal handlers for the kernel. |
| 16 | * Naturally it's not a 1:1 relation, but there are similarities. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/config.h> |
| 20 | #include <linux/ptrace.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/signal.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/ioport.h> |
| 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/timex.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/random.h> |
| 29 | #include <linux/smp_lock.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/kernel_stat.h> |
| 32 | #include <linux/irq.h> |
| 33 | #include <linux/proc_fs.h> |
| 34 | #include <linux/seq_file.h> |
| 35 | |
| 36 | #include <asm/atomic.h> |
| 37 | #include <asm/io.h> |
| 38 | #include <asm/smp.h> |
| 39 | #include <asm/system.h> |
| 40 | #include <asm/bitops.h> |
| 41 | #include <asm/uaccess.h> |
| 42 | #include <asm/pgalloc.h> |
| 43 | #include <asm/delay.h> |
| 44 | #include <asm/irq.h> |
| 45 | #include <asm/irc-regs.h> |
| 46 | #include <asm/irq-routing.h> |
| 47 | #include <asm/gdb-stub.h> |
| 48 | |
| 49 | extern void __init fpga_init(void); |
| 50 | extern void __init route_mb93493_irqs(void); |
| 51 | |
| 52 | static void register_irq_proc (unsigned int irq); |
| 53 | |
| 54 | /* |
| 55 | * Special irq handlers. |
| 56 | */ |
| 57 | |
| 58 | irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs) { return IRQ_HANDLED; } |
| 59 | |
| 60 | atomic_t irq_err_count; |
| 61 | |
| 62 | /* |
| 63 | * Generic, controller-independent functions: |
| 64 | */ |
| 65 | int show_interrupts(struct seq_file *p, void *v) |
| 66 | { |
| 67 | struct irqaction *action; |
| 68 | struct irq_group *group; |
| 69 | unsigned long flags; |
| 70 | int level, grp, ix, i, j; |
| 71 | |
| 72 | i = *(loff_t *) v; |
| 73 | |
| 74 | switch (i) { |
| 75 | case 0: |
| 76 | seq_printf(p, " "); |
| 77 | for (j = 0; j < NR_CPUS; j++) |
| 78 | if (cpu_online(j)) |
| 79 | seq_printf(p, "CPU%d ",j); |
| 80 | |
| 81 | seq_putc(p, '\n'); |
| 82 | break; |
| 83 | |
| 84 | case 1 ... NR_IRQ_GROUPS * NR_IRQ_ACTIONS_PER_GROUP: |
| 85 | local_irq_save(flags); |
| 86 | |
| 87 | grp = (i - 1) / NR_IRQ_ACTIONS_PER_GROUP; |
| 88 | group = irq_groups[grp]; |
| 89 | if (!group) |
| 90 | goto skip; |
| 91 | |
| 92 | ix = (i - 1) % NR_IRQ_ACTIONS_PER_GROUP; |
| 93 | action = group->actions[ix]; |
| 94 | if (!action) |
| 95 | goto skip; |
| 96 | |
| 97 | seq_printf(p, "%3d: ", i - 1); |
| 98 | |
| 99 | #ifndef CONFIG_SMP |
| 100 | seq_printf(p, "%10u ", kstat_irqs(i)); |
| 101 | #else |
| 102 | for (j = 0; j < NR_CPUS; j++) |
| 103 | if (cpu_online(j)) |
| 104 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i - 1]); |
| 105 | #endif |
| 106 | |
| 107 | level = group->sources[ix]->level - frv_irq_levels; |
| 108 | |
| 109 | seq_printf(p, " %12s@%x", group->sources[ix]->muxname, level); |
| 110 | seq_printf(p, " %s", action->name); |
| 111 | |
| 112 | for (action = action->next; action; action = action->next) |
| 113 | seq_printf(p, ", %s", action->name); |
| 114 | |
| 115 | seq_putc(p, '\n'); |
| 116 | skip: |
| 117 | local_irq_restore(flags); |
| 118 | break; |
| 119 | |
| 120 | case NR_IRQ_GROUPS * NR_IRQ_ACTIONS_PER_GROUP + 1: |
| 121 | seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); |
| 122 | break; |
| 123 | |
| 124 | default: |
| 125 | break; |
| 126 | } |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | |
| 132 | /* |
| 133 | * Generic enable/disable code: this just calls |
| 134 | * down into the PIC-specific version for the actual |
| 135 | * hardware disable after having gotten the irq |
| 136 | * controller lock. |
| 137 | */ |
| 138 | |
| 139 | /** |
| 140 | * disable_irq_nosync - disable an irq without waiting |
| 141 | * @irq: Interrupt to disable |
| 142 | * |
| 143 | * Disable the selected interrupt line. Disables and Enables are |
| 144 | * nested. |
| 145 | * Unlike disable_irq(), this function does not ensure existing |
| 146 | * instances of the IRQ handler have completed before returning. |
| 147 | * |
| 148 | * This function may be called from IRQ context. |
| 149 | */ |
| 150 | |
| 151 | void disable_irq_nosync(unsigned int irq) |
| 152 | { |
| 153 | struct irq_source *source; |
| 154 | struct irq_group *group; |
| 155 | struct irq_level *level; |
| 156 | unsigned long flags; |
| 157 | int idx = irq & (NR_IRQ_ACTIONS_PER_GROUP - 1); |
| 158 | |
| 159 | group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP]; |
| 160 | if (!group) |
| 161 | BUG(); |
| 162 | |
| 163 | source = group->sources[idx]; |
| 164 | if (!source) |
| 165 | BUG(); |
| 166 | |
| 167 | level = source->level; |
| 168 | |
| 169 | spin_lock_irqsave(&level->lock, flags); |
| 170 | |
| 171 | if (group->control) { |
| 172 | if (!group->disable_cnt[idx]++) |
| 173 | group->control(group, idx, 0); |
| 174 | } else if (!level->disable_count++) { |
| 175 | __set_MASK(level - frv_irq_levels); |
| 176 | } |
| 177 | |
| 178 | spin_unlock_irqrestore(&level->lock, flags); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * disable_irq - disable an irq and wait for completion |
| 183 | * @irq: Interrupt to disable |
| 184 | * |
| 185 | * Disable the selected interrupt line. Enables and Disables are |
| 186 | * nested. |
| 187 | * This function waits for any pending IRQ handlers for this interrupt |
| 188 | * to complete before returning. If you use this function while |
| 189 | * holding a resource the IRQ handler may need you will deadlock. |
| 190 | * |
| 191 | * This function may be called - with care - from IRQ context. |
| 192 | */ |
| 193 | |
| 194 | void disable_irq(unsigned int irq) |
| 195 | { |
| 196 | disable_irq_nosync(irq); |
| 197 | |
| 198 | #ifdef CONFIG_SMP |
| 199 | if (!local_irq_count(smp_processor_id())) { |
| 200 | do { |
| 201 | barrier(); |
| 202 | } while (irq_desc[irq].status & IRQ_INPROGRESS); |
| 203 | } |
| 204 | #endif |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * enable_irq - enable handling of an irq |
| 209 | * @irq: Interrupt to enable |
| 210 | * |
| 211 | * Undoes the effect of one call to disable_irq(). If this |
| 212 | * matches the last disable, processing of interrupts on this |
| 213 | * IRQ line is re-enabled. |
| 214 | * |
| 215 | * This function may be called from IRQ context. |
| 216 | */ |
| 217 | |
| 218 | void enable_irq(unsigned int irq) |
| 219 | { |
| 220 | struct irq_source *source; |
| 221 | struct irq_group *group; |
| 222 | struct irq_level *level; |
| 223 | unsigned long flags; |
| 224 | int idx = irq & (NR_IRQ_ACTIONS_PER_GROUP - 1); |
| 225 | int count; |
| 226 | |
| 227 | group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP]; |
| 228 | if (!group) |
| 229 | BUG(); |
| 230 | |
| 231 | source = group->sources[idx]; |
| 232 | if (!source) |
| 233 | BUG(); |
| 234 | |
| 235 | level = source->level; |
| 236 | |
| 237 | spin_lock_irqsave(&level->lock, flags); |
| 238 | |
| 239 | if (group->control) |
| 240 | count = group->disable_cnt[idx]; |
| 241 | else |
| 242 | count = level->disable_count; |
| 243 | |
| 244 | switch (count) { |
| 245 | case 1: |
| 246 | if (group->control) { |
| 247 | if (group->actions[idx]) |
| 248 | group->control(group, idx, 1); |
| 249 | } else { |
| 250 | if (level->usage) |
| 251 | __clr_MASK(level - frv_irq_levels); |
| 252 | } |
| 253 | /* fall-through */ |
| 254 | |
| 255 | default: |
| 256 | count--; |
| 257 | break; |
| 258 | |
| 259 | case 0: |
| 260 | printk("enable_irq(%u) unbalanced from %p\n", irq, __builtin_return_address(0)); |
| 261 | } |
| 262 | |
| 263 | if (group->control) |
| 264 | group->disable_cnt[idx] = count; |
| 265 | else |
| 266 | level->disable_count = count; |
| 267 | |
| 268 | spin_unlock_irqrestore(&level->lock, flags); |
| 269 | } |
| 270 | |
| 271 | /*****************************************************************************/ |
| 272 | /* |
| 273 | * handles all normal device IRQ's |
| 274 | * - registers are referred to by the __frame variable (GR28) |
| 275 | * - IRQ distribution is complicated in this arch because of the many PICs, the |
| 276 | * way they work and the way they cascade |
| 277 | */ |
| 278 | asmlinkage void do_IRQ(void) |
| 279 | { |
| 280 | struct irq_source *source; |
| 281 | int level, cpu; |
| 282 | |
| 283 | level = (__frame->tbr >> 4) & 0xf; |
| 284 | cpu = smp_processor_id(); |
| 285 | |
| 286 | #if 0 |
| 287 | { |
| 288 | static u32 irqcount; |
| 289 | *(volatile u32 *) 0xe1200004 = ~((irqcount++ << 8) | level); |
| 290 | *(volatile u16 *) 0xffc00100 = (u16) ~0x9999; |
| 291 | mb(); |
| 292 | } |
| 293 | #endif |
| 294 | |
| 295 | if ((unsigned long) __frame - (unsigned long) (current + 1) < 512) |
| 296 | BUG(); |
| 297 | |
| 298 | __set_MASK(level); |
| 299 | __clr_RC(level); |
| 300 | __clr_IRL(); |
| 301 | |
| 302 | kstat_this_cpu.irqs[level]++; |
| 303 | |
| 304 | irq_enter(); |
| 305 | |
| 306 | for (source = frv_irq_levels[level].sources; source; source = source->next) |
| 307 | source->doirq(source); |
| 308 | |
| 309 | irq_exit(); |
| 310 | |
| 311 | __clr_MASK(level); |
| 312 | |
| 313 | /* only process softirqs if we didn't interrupt another interrupt handler */ |
| 314 | if ((__frame->psr & PSR_PIL) == PSR_PIL_0) |
| 315 | if (local_softirq_pending()) |
| 316 | do_softirq(); |
| 317 | |
| 318 | #ifdef CONFIG_PREEMPT |
| 319 | local_irq_disable(); |
| 320 | while (--current->preempt_count == 0) { |
| 321 | if (!(__frame->psr & PSR_S) || |
| 322 | current->need_resched == 0 || |
| 323 | in_interrupt()) |
| 324 | break; |
| 325 | current->preempt_count++; |
| 326 | local_irq_enable(); |
| 327 | preempt_schedule(); |
| 328 | local_irq_disable(); |
| 329 | } |
| 330 | #endif |
| 331 | |
| 332 | #if 0 |
| 333 | { |
| 334 | *(volatile u16 *) 0xffc00100 = (u16) ~0x6666; |
| 335 | mb(); |
| 336 | } |
| 337 | #endif |
| 338 | |
| 339 | } /* end do_IRQ() */ |
| 340 | |
| 341 | /*****************************************************************************/ |
| 342 | /* |
| 343 | * handles all NMIs when not co-opted by the debugger |
| 344 | * - registers are referred to by the __frame variable (GR28) |
| 345 | */ |
| 346 | asmlinkage void do_NMI(void) |
| 347 | { |
| 348 | } /* end do_NMI() */ |
| 349 | |
| 350 | /*****************************************************************************/ |
| 351 | /** |
| 352 | * request_irq - allocate an interrupt line |
| 353 | * @irq: Interrupt line to allocate |
| 354 | * @handler: Function to be called when the IRQ occurs |
| 355 | * @irqflags: Interrupt type flags |
| 356 | * @devname: An ascii name for the claiming device |
| 357 | * @dev_id: A cookie passed back to the handler function |
| 358 | * |
| 359 | * This call allocates interrupt resources and enables the |
| 360 | * interrupt line and IRQ handling. From the point this |
| 361 | * call is made your handler function may be invoked. Since |
| 362 | * your handler function must clear any interrupt the board |
| 363 | * raises, you must take care both to initialise your hardware |
| 364 | * and to set up the interrupt handler in the right order. |
| 365 | * |
| 366 | * Dev_id must be globally unique. Normally the address of the |
| 367 | * device data structure is used as the cookie. Since the handler |
| 368 | * receives this value it makes sense to use it. |
| 369 | * |
| 370 | * If your interrupt is shared you must pass a non NULL dev_id |
| 371 | * as this is required when freeing the interrupt. |
| 372 | * |
| 373 | * Flags: |
| 374 | * |
| 375 | * SA_SHIRQ Interrupt is shared |
| 376 | * |
| 377 | * SA_INTERRUPT Disable local interrupts while processing |
| 378 | * |
| 379 | * SA_SAMPLE_RANDOM The interrupt can be used for entropy |
| 380 | * |
| 381 | */ |
| 382 | |
| 383 | int request_irq(unsigned int irq, |
| 384 | irqreturn_t (*handler)(int, void *, struct pt_regs *), |
| 385 | unsigned long irqflags, |
| 386 | const char * devname, |
| 387 | void *dev_id) |
| 388 | { |
| 389 | int retval; |
| 390 | struct irqaction *action; |
| 391 | |
| 392 | #if 1 |
| 393 | /* |
| 394 | * Sanity-check: shared interrupts should REALLY pass in |
| 395 | * a real dev-ID, otherwise we'll have trouble later trying |
| 396 | * to figure out which interrupt is which (messes up the |
| 397 | * interrupt freeing logic etc). |
| 398 | */ |
| 399 | if (irqflags & SA_SHIRQ) { |
| 400 | if (!dev_id) |
| 401 | printk("Bad boy: %s (at 0x%x) called us without a dev_id!\n", |
| 402 | devname, (&irq)[-1]); |
| 403 | } |
| 404 | #endif |
| 405 | |
| 406 | if ((irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP) >= NR_IRQ_GROUPS) |
| 407 | return -EINVAL; |
| 408 | if (!handler) |
| 409 | return -EINVAL; |
| 410 | |
| 411 | action = (struct irqaction *) kmalloc(sizeof(struct irqaction), GFP_KERNEL); |
| 412 | if (!action) |
| 413 | return -ENOMEM; |
| 414 | |
| 415 | action->handler = handler; |
| 416 | action->flags = irqflags; |
| 417 | action->mask = CPU_MASK_NONE; |
| 418 | action->name = devname; |
| 419 | action->next = NULL; |
| 420 | action->dev_id = dev_id; |
| 421 | |
| 422 | retval = setup_irq(irq, action); |
| 423 | if (retval) |
| 424 | kfree(action); |
| 425 | return retval; |
| 426 | } |
| 427 | |
| 428 | /** |
| 429 | * free_irq - free an interrupt |
| 430 | * @irq: Interrupt line to free |
| 431 | * @dev_id: Device identity to free |
| 432 | * |
| 433 | * Remove an interrupt handler. The handler is removed and if the |
| 434 | * interrupt line is no longer in use by any driver it is disabled. |
| 435 | * On a shared IRQ the caller must ensure the interrupt is disabled |
| 436 | * on the card it drives before calling this function. The function |
| 437 | * does not return until any executing interrupts for this IRQ |
| 438 | * have completed. |
| 439 | * |
| 440 | * This function may be called from interrupt context. |
| 441 | * |
| 442 | * Bugs: Attempting to free an irq in a handler for the same irq hangs |
| 443 | * the machine. |
| 444 | */ |
| 445 | |
| 446 | void free_irq(unsigned int irq, void *dev_id) |
| 447 | { |
| 448 | struct irq_source *source; |
| 449 | struct irq_group *group; |
| 450 | struct irq_level *level; |
| 451 | struct irqaction **p, **pp; |
| 452 | unsigned long flags; |
| 453 | |
| 454 | if ((irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP) >= NR_IRQ_GROUPS) |
| 455 | return; |
| 456 | |
| 457 | group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP]; |
| 458 | if (!group) |
| 459 | BUG(); |
| 460 | |
| 461 | source = group->sources[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)]; |
| 462 | if (!source) |
| 463 | BUG(); |
| 464 | |
| 465 | level = source->level; |
| 466 | p = &group->actions[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)]; |
| 467 | |
| 468 | spin_lock_irqsave(&level->lock, flags); |
| 469 | |
| 470 | for (pp = p; *pp; pp = &(*pp)->next) { |
| 471 | struct irqaction *action = *pp; |
| 472 | |
| 473 | if (action->dev_id != dev_id) |
| 474 | continue; |
| 475 | |
| 476 | /* found it - remove from the list of entries */ |
| 477 | *pp = action->next; |
| 478 | |
| 479 | level->usage--; |
| 480 | |
| 481 | if (p == pp && group->control) |
| 482 | group->control(group, irq & (NR_IRQ_ACTIONS_PER_GROUP - 1), 0); |
| 483 | |
| 484 | if (level->usage == 0) |
| 485 | __set_MASK(level - frv_irq_levels); |
| 486 | |
| 487 | spin_unlock_irqrestore(&level->lock,flags); |
| 488 | |
| 489 | #ifdef CONFIG_SMP |
| 490 | /* Wait to make sure it's not being used on another CPU */ |
| 491 | while (desc->status & IRQ_INPROGRESS) |
| 492 | barrier(); |
| 493 | #endif |
| 494 | kfree(action); |
| 495 | return; |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | /* |
| 500 | * IRQ autodetection code.. |
| 501 | * |
| 502 | * This depends on the fact that any interrupt that comes in on to an |
| 503 | * unassigned IRQ will cause GxICR_DETECT to be set |
| 504 | */ |
| 505 | |
| 506 | static DECLARE_MUTEX(probe_sem); |
| 507 | |
| 508 | /** |
| 509 | * probe_irq_on - begin an interrupt autodetect |
| 510 | * |
| 511 | * Commence probing for an interrupt. The interrupts are scanned |
| 512 | * and a mask of potential interrupt lines is returned. |
| 513 | * |
| 514 | */ |
| 515 | |
| 516 | unsigned long probe_irq_on(void) |
| 517 | { |
| 518 | down(&probe_sem); |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Return a mask of triggered interrupts (this |
| 524 | * can handle only legacy ISA interrupts). |
| 525 | */ |
| 526 | |
| 527 | /** |
| 528 | * probe_irq_mask - scan a bitmap of interrupt lines |
| 529 | * @val: mask of interrupts to consider |
| 530 | * |
| 531 | * Scan the ISA bus interrupt lines and return a bitmap of |
| 532 | * active interrupts. The interrupt probe logic state is then |
| 533 | * returned to its previous value. |
| 534 | * |
| 535 | * Note: we need to scan all the irq's even though we will |
| 536 | * only return ISA irq numbers - just so that we reset them |
| 537 | * all to a known state. |
| 538 | */ |
| 539 | unsigned int probe_irq_mask(unsigned long xmask) |
| 540 | { |
| 541 | up(&probe_sem); |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * Return the one interrupt that triggered (this can |
| 547 | * handle any interrupt source). |
| 548 | */ |
| 549 | |
| 550 | /** |
| 551 | * probe_irq_off - end an interrupt autodetect |
| 552 | * @xmask: mask of potential interrupts (unused) |
| 553 | * |
| 554 | * Scans the unused interrupt lines and returns the line which |
| 555 | * appears to have triggered the interrupt. If no interrupt was |
| 556 | * found then zero is returned. If more than one interrupt is |
| 557 | * found then minus the first candidate is returned to indicate |
| 558 | * their is doubt. |
| 559 | * |
| 560 | * The interrupt probe logic state is returned to its previous |
| 561 | * value. |
| 562 | * |
| 563 | * BUGS: When used in a module (which arguably shouldnt happen) |
| 564 | * nothing prevents two IRQ probe callers from overlapping. The |
| 565 | * results of this are non-optimal. |
| 566 | */ |
| 567 | |
| 568 | int probe_irq_off(unsigned long xmask) |
| 569 | { |
| 570 | up(&probe_sem); |
| 571 | return -1; |
| 572 | } |
| 573 | |
| 574 | /* this was setup_x86_irq but it seems pretty generic */ |
| 575 | int setup_irq(unsigned int irq, struct irqaction *new) |
| 576 | { |
| 577 | struct irq_source *source; |
| 578 | struct irq_group *group; |
| 579 | struct irq_level *level; |
| 580 | struct irqaction **p, **pp; |
| 581 | unsigned long flags; |
| 582 | |
| 583 | group = irq_groups[irq >> NR_IRQ_LOG2_ACTIONS_PER_GROUP]; |
| 584 | if (!group) |
| 585 | BUG(); |
| 586 | |
| 587 | source = group->sources[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)]; |
| 588 | if (!source) |
| 589 | BUG(); |
| 590 | |
| 591 | level = source->level; |
| 592 | |
| 593 | p = &group->actions[irq & (NR_IRQ_ACTIONS_PER_GROUP - 1)]; |
| 594 | |
| 595 | /* |
| 596 | * Some drivers like serial.c use request_irq() heavily, |
| 597 | * so we have to be careful not to interfere with a |
| 598 | * running system. |
| 599 | */ |
| 600 | if (new->flags & SA_SAMPLE_RANDOM) { |
| 601 | /* |
| 602 | * This function might sleep, we want to call it first, |
| 603 | * outside of the atomic block. |
| 604 | * Yes, this might clear the entropy pool if the wrong |
| 605 | * driver is attempted to be loaded, without actually |
| 606 | * installing a new handler, but is this really a problem, |
| 607 | * only the sysadmin is able to do this. |
| 608 | */ |
| 609 | rand_initialize_irq(irq); |
| 610 | } |
| 611 | |
| 612 | /* must juggle the interrupt processing stuff with interrupts disabled */ |
| 613 | spin_lock_irqsave(&level->lock, flags); |
| 614 | |
| 615 | /* can't share interrupts unless all parties agree to */ |
| 616 | if (level->usage != 0 && !(level->flags & new->flags & SA_SHIRQ)) { |
| 617 | spin_unlock_irqrestore(&level->lock,flags); |
| 618 | return -EBUSY; |
| 619 | } |
| 620 | |
| 621 | /* add new interrupt at end of irq queue */ |
| 622 | pp = p; |
| 623 | while (*pp) |
| 624 | pp = &(*pp)->next; |
| 625 | |
| 626 | *pp = new; |
| 627 | |
| 628 | level->usage++; |
| 629 | level->flags = new->flags; |
| 630 | |
| 631 | /* turn the interrupts on */ |
| 632 | if (level->usage == 1) |
| 633 | __clr_MASK(level - frv_irq_levels); |
| 634 | |
| 635 | if (p == pp && group->control) |
| 636 | group->control(group, irq & (NR_IRQ_ACTIONS_PER_GROUP - 1), 1); |
| 637 | |
| 638 | spin_unlock_irqrestore(&level->lock, flags); |
| 639 | register_irq_proc(irq); |
| 640 | return 0; |
| 641 | } |
| 642 | |
| 643 | static struct proc_dir_entry * root_irq_dir; |
| 644 | static struct proc_dir_entry * irq_dir [NR_IRQS]; |
| 645 | |
| 646 | #define HEX_DIGITS 8 |
| 647 | |
| 648 | static unsigned int parse_hex_value (const char *buffer, |
| 649 | unsigned long count, unsigned long *ret) |
| 650 | { |
| 651 | unsigned char hexnum [HEX_DIGITS]; |
| 652 | unsigned long value; |
| 653 | int i; |
| 654 | |
| 655 | if (!count) |
| 656 | return -EINVAL; |
| 657 | if (count > HEX_DIGITS) |
| 658 | count = HEX_DIGITS; |
| 659 | if (copy_from_user(hexnum, buffer, count)) |
| 660 | return -EFAULT; |
| 661 | |
| 662 | /* |
| 663 | * Parse the first 8 characters as a hex string, any non-hex char |
| 664 | * is end-of-string. '00e1', 'e1', '00E1', 'E1' are all the same. |
| 665 | */ |
| 666 | value = 0; |
| 667 | |
| 668 | for (i = 0; i < count; i++) { |
| 669 | unsigned int c = hexnum[i]; |
| 670 | |
| 671 | switch (c) { |
| 672 | case '0' ... '9': c -= '0'; break; |
| 673 | case 'a' ... 'f': c -= 'a'-10; break; |
| 674 | case 'A' ... 'F': c -= 'A'-10; break; |
| 675 | default: |
| 676 | goto out; |
| 677 | } |
| 678 | value = (value << 4) | c; |
| 679 | } |
| 680 | out: |
| 681 | *ret = value; |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | |
| 686 | static int prof_cpu_mask_read_proc (char *page, char **start, off_t off, |
| 687 | int count, int *eof, void *data) |
| 688 | { |
| 689 | unsigned long *mask = (unsigned long *) data; |
| 690 | if (count < HEX_DIGITS+1) |
| 691 | return -EINVAL; |
| 692 | return sprintf (page, "%08lx\n", *mask); |
| 693 | } |
| 694 | |
| 695 | static int prof_cpu_mask_write_proc (struct file *file, const char *buffer, |
| 696 | unsigned long count, void *data) |
| 697 | { |
| 698 | unsigned long *mask = (unsigned long *) data, full_count = count, err; |
| 699 | unsigned long new_value; |
| 700 | |
| 701 | show_state(); |
| 702 | err = parse_hex_value(buffer, count, &new_value); |
| 703 | if (err) |
| 704 | return err; |
| 705 | |
| 706 | *mask = new_value; |
| 707 | return full_count; |
| 708 | } |
| 709 | |
| 710 | #define MAX_NAMELEN 10 |
| 711 | |
| 712 | static void register_irq_proc (unsigned int irq) |
| 713 | { |
| 714 | char name [MAX_NAMELEN]; |
| 715 | |
| 716 | if (!root_irq_dir || irq_dir[irq]) |
| 717 | return; |
| 718 | |
| 719 | memset(name, 0, MAX_NAMELEN); |
| 720 | sprintf(name, "%d", irq); |
| 721 | |
| 722 | /* create /proc/irq/1234 */ |
| 723 | irq_dir[irq] = proc_mkdir(name, root_irq_dir); |
| 724 | } |
| 725 | |
| 726 | unsigned long prof_cpu_mask = -1; |
| 727 | |
| 728 | void init_irq_proc (void) |
| 729 | { |
| 730 | struct proc_dir_entry *entry; |
| 731 | int i; |
| 732 | |
| 733 | /* create /proc/irq */ |
| 734 | root_irq_dir = proc_mkdir("irq", 0); |
| 735 | |
| 736 | /* create /proc/irq/prof_cpu_mask */ |
| 737 | entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir); |
| 738 | if (!entry) |
| 739 | return; |
| 740 | |
| 741 | entry->nlink = 1; |
| 742 | entry->data = (void *)&prof_cpu_mask; |
| 743 | entry->read_proc = prof_cpu_mask_read_proc; |
| 744 | entry->write_proc = prof_cpu_mask_write_proc; |
| 745 | |
| 746 | /* |
| 747 | * Create entries for all existing IRQs. |
| 748 | */ |
| 749 | for (i = 0; i < NR_IRQS; i++) |
| 750 | register_irq_proc(i); |
| 751 | } |
| 752 | |
| 753 | /*****************************************************************************/ |
| 754 | /* |
| 755 | * initialise the interrupt system |
| 756 | */ |
| 757 | void __init init_IRQ(void) |
| 758 | { |
| 759 | route_cpu_irqs(); |
| 760 | fpga_init(); |
| 761 | #ifdef CONFIG_FUJITSU_MB93493 |
| 762 | route_mb93493_irqs(); |
| 763 | #endif |
| 764 | } /* end init_IRQ() */ |