Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Macintosh interrupts |
| 3 | * |
| 4 | * General design: |
| 5 | * In contrary to the Amiga and Atari platforms, the Mac hardware seems to |
| 6 | * exclusively use the autovector interrupts (the 'generic level0-level7' |
| 7 | * interrupts with exception vectors 0x19-0x1f). The following interrupt levels |
| 8 | * are used: |
| 9 | * 1 - VIA1 |
| 10 | * - slot 0: one second interrupt (CA2) |
| 11 | * - slot 1: VBlank (CA1) |
| 12 | * - slot 2: ADB data ready (SR full) |
| 13 | * - slot 3: ADB data (CB2) |
| 14 | * - slot 4: ADB clock (CB1) |
| 15 | * - slot 5: timer 2 |
| 16 | * - slot 6: timer 1 |
| 17 | * - slot 7: status of IRQ; signals 'any enabled int.' |
| 18 | * |
| 19 | * 2 - VIA2 or RBV |
| 20 | * - slot 0: SCSI DRQ (CA2) |
| 21 | * - slot 1: NUBUS IRQ (CA1) need to read port A to find which |
| 22 | * - slot 2: /EXP IRQ (only on IIci) |
| 23 | * - slot 3: SCSI IRQ (CB2) |
| 24 | * - slot 4: ASC IRQ (CB1) |
| 25 | * - slot 5: timer 2 (not on IIci) |
| 26 | * - slot 6: timer 1 (not on IIci) |
| 27 | * - slot 7: status of IRQ; signals 'any enabled int.' |
| 28 | * |
| 29 | * 2 - OSS (IIfx only?) |
| 30 | * - slot 0: SCSI interrupt |
| 31 | * - slot 1: Sound interrupt |
| 32 | * |
| 33 | * Levels 3-6 vary by machine type. For VIA or RBV Macintoshes: |
| 34 | * |
| 35 | * 3 - unused (?) |
| 36 | * |
| 37 | * 4 - SCC (slot number determined by reading RR3 on the SSC itself) |
| 38 | * - slot 1: SCC channel A |
| 39 | * - slot 2: SCC channel B |
| 40 | * |
| 41 | * 5 - unused (?) |
| 42 | * [serial errors or special conditions seem to raise level 6 |
| 43 | * interrupts on some models (LC4xx?)] |
| 44 | * |
| 45 | * 6 - off switch (?) |
| 46 | * |
| 47 | * For OSS Macintoshes (IIfx only at this point): |
| 48 | * |
| 49 | * 3 - Nubus interrupt |
| 50 | * - slot 0: Slot $9 |
| 51 | * - slot 1: Slot $A |
| 52 | * - slot 2: Slot $B |
| 53 | * - slot 3: Slot $C |
| 54 | * - slot 4: Slot $D |
| 55 | * - slot 5: Slot $E |
| 56 | * |
| 57 | * 4 - SCC IOP |
| 58 | * - slot 1: SCC channel A |
| 59 | * - slot 2: SCC channel B |
| 60 | * |
| 61 | * 5 - ISM IOP (ADB?) |
| 62 | * |
| 63 | * 6 - unused |
| 64 | * |
| 65 | * For PSC Macintoshes (660AV, 840AV): |
| 66 | * |
| 67 | * 3 - PSC level 3 |
| 68 | * - slot 0: MACE |
| 69 | * |
| 70 | * 4 - PSC level 4 |
| 71 | * - slot 1: SCC channel A interrupt |
| 72 | * - slot 2: SCC channel B interrupt |
| 73 | * - slot 3: MACE DMA |
| 74 | * |
| 75 | * 5 - PSC level 5 |
| 76 | * |
| 77 | * 6 - PSC level 6 |
| 78 | * |
| 79 | * Finally we have good 'ole level 7, the non-maskable interrupt: |
| 80 | * |
| 81 | * 7 - NMI (programmer's switch on the back of some Macs) |
| 82 | * Also RAM parity error on models which support it (IIc, IIfx?) |
| 83 | * |
| 84 | * The current interrupt logic looks something like this: |
| 85 | * |
| 86 | * - We install dispatchers for the autovector interrupts (1-7). These |
| 87 | * dispatchers are responsible for querying the hardware (the |
| 88 | * VIA/RBV/OSS/PSC chips) to determine the actual interrupt source. Using |
| 89 | * this information a machspec interrupt number is generated by placing the |
| 90 | * index of the interrupt hardware into the low three bits and the original |
| 91 | * autovector interrupt number in the upper 5 bits. The handlers for the |
| 92 | * resulting machspec interrupt are then called. |
| 93 | * |
| 94 | * - Nubus is a special case because its interrupts are hidden behind two |
| 95 | * layers of hardware. Nubus interrupts come in as index 1 on VIA #2, |
| 96 | * which translates to IRQ number 17. In this spot we install _another_ |
| 97 | * dispatcher. This dispatcher finds the interrupting slot number (9-F) and |
| 98 | * then forms a new machspec interrupt number as above with the slot number |
| 99 | * minus 9 in the low three bits and the pseudo-level 7 in the upper five |
| 100 | * bits. The handlers for this new machspec interrupt number are then |
| 101 | * called. This puts Nubus interrupts into the range 56-62. |
| 102 | * |
| 103 | * - The Baboon interrupts (used on some PowerBooks) are an even more special |
| 104 | * case. They're hidden behind the Nubus slot $C interrupt thus adding a |
| 105 | * third layer of indirection. Why oh why did the Apple engineers do that? |
| 106 | * |
| 107 | * - We support "fast" and "slow" handlers, just like the Amiga port. The |
| 108 | * fast handlers are called first and with all interrupts disabled. They |
| 109 | * are expected to execute quickly (hence the name). The slow handlers are |
| 110 | * called last with interrupts enabled and the interrupt level restored. |
| 111 | * They must therefore be reentrant. |
| 112 | * |
| 113 | * TODO: |
| 114 | * |
| 115 | */ |
| 116 | |
| 117 | #include <linux/types.h> |
| 118 | #include <linux/kernel.h> |
| 119 | #include <linux/sched.h> |
| 120 | #include <linux/kernel_stat.h> |
| 121 | #include <linux/interrupt.h> /* for intr_count */ |
| 122 | #include <linux/delay.h> |
| 123 | #include <linux/seq_file.h> |
| 124 | |
| 125 | #include <asm/system.h> |
| 126 | #include <asm/irq.h> |
| 127 | #include <asm/traps.h> |
| 128 | #include <asm/bootinfo.h> |
| 129 | #include <asm/machw.h> |
| 130 | #include <asm/macintosh.h> |
| 131 | #include <asm/mac_via.h> |
| 132 | #include <asm/mac_psc.h> |
| 133 | #include <asm/hwtest.h> |
| 134 | #include <asm/errno.h> |
| 135 | #include <asm/macints.h> |
| 136 | |
| 137 | #define DEBUG_SPURIOUS |
| 138 | #define SHUTUP_SONIC |
| 139 | |
| 140 | /* |
| 141 | * The mac_irq_list array is an array of linked lists of irq_node_t nodes. |
| 142 | * Each node contains one handler to be called whenever the interrupt |
| 143 | * occurs, with fast handlers listed before slow handlers. |
| 144 | */ |
| 145 | |
| 146 | irq_node_t *mac_irq_list[NUM_MAC_SOURCES]; |
| 147 | |
| 148 | /* SCC interrupt mask */ |
| 149 | |
| 150 | static int scc_mask; |
| 151 | |
| 152 | /* |
| 153 | * VIA/RBV hooks |
| 154 | */ |
| 155 | |
| 156 | extern void via_init(void); |
| 157 | extern void via_register_interrupts(void); |
| 158 | extern void via_irq_enable(int); |
| 159 | extern void via_irq_disable(int); |
| 160 | extern void via_irq_clear(int); |
| 161 | extern int via_irq_pending(int); |
| 162 | |
| 163 | /* |
| 164 | * OSS hooks |
| 165 | */ |
| 166 | |
| 167 | extern int oss_present; |
| 168 | |
| 169 | extern void oss_init(void); |
| 170 | extern void oss_register_interrupts(void); |
| 171 | extern void oss_irq_enable(int); |
| 172 | extern void oss_irq_disable(int); |
| 173 | extern void oss_irq_clear(int); |
| 174 | extern int oss_irq_pending(int); |
| 175 | |
| 176 | /* |
| 177 | * PSC hooks |
| 178 | */ |
| 179 | |
| 180 | extern int psc_present; |
| 181 | |
| 182 | extern void psc_init(void); |
| 183 | extern void psc_register_interrupts(void); |
| 184 | extern void psc_irq_enable(int); |
| 185 | extern void psc_irq_disable(int); |
| 186 | extern void psc_irq_clear(int); |
| 187 | extern int psc_irq_pending(int); |
| 188 | |
| 189 | /* |
| 190 | * IOP hooks |
| 191 | */ |
| 192 | |
| 193 | extern void iop_register_interrupts(void); |
| 194 | |
| 195 | /* |
| 196 | * Baboon hooks |
| 197 | */ |
| 198 | |
| 199 | extern int baboon_present; |
| 200 | |
| 201 | extern void baboon_init(void); |
| 202 | extern void baboon_register_interrupts(void); |
| 203 | extern void baboon_irq_enable(int); |
| 204 | extern void baboon_irq_disable(int); |
| 205 | extern void baboon_irq_clear(int); |
| 206 | extern int baboon_irq_pending(int); |
| 207 | |
| 208 | /* |
| 209 | * SCC interrupt routines |
| 210 | */ |
| 211 | |
| 212 | static void scc_irq_enable(int); |
| 213 | static void scc_irq_disable(int); |
| 214 | |
| 215 | /* |
| 216 | * console_loglevel determines NMI handler function |
| 217 | */ |
| 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | irqreturn_t mac_nmi_handler(int, void *, struct pt_regs *); |
| 220 | irqreturn_t mac_debug_handler(int, void *, struct pt_regs *); |
| 221 | |
| 222 | /* #define DEBUG_MACINTS */ |
| 223 | |
| 224 | void mac_init_IRQ(void) |
| 225 | { |
| 226 | int i; |
| 227 | |
| 228 | #ifdef DEBUG_MACINTS |
| 229 | printk("mac_init_IRQ(): Setting things up...\n"); |
| 230 | #endif |
| 231 | /* Initialize the IRQ handler lists. Initially each list is empty, */ |
| 232 | |
| 233 | for (i = 0; i < NUM_MAC_SOURCES; i++) { |
| 234 | mac_irq_list[i] = NULL; |
| 235 | } |
| 236 | |
| 237 | scc_mask = 0; |
| 238 | |
| 239 | /* Make sure the SONIC interrupt is cleared or things get ugly */ |
| 240 | #ifdef SHUTUP_SONIC |
| 241 | printk("Killing onboard sonic... "); |
| 242 | /* This address should hopefully be mapped already */ |
| 243 | if (hwreg_present((void*)(0x50f0a000))) { |
| 244 | *(long *)(0x50f0a014) = 0x7fffL; |
| 245 | *(long *)(0x50f0a010) = 0L; |
| 246 | } |
| 247 | printk("Done.\n"); |
| 248 | #endif /* SHUTUP_SONIC */ |
| 249 | |
| 250 | /* |
| 251 | * Now register the handlers for the master IRQ handlers |
| 252 | * at levels 1-7. Most of the work is done elsewhere. |
| 253 | */ |
| 254 | |
| 255 | if (oss_present) { |
| 256 | oss_register_interrupts(); |
| 257 | } else { |
| 258 | via_register_interrupts(); |
| 259 | } |
| 260 | if (psc_present) psc_register_interrupts(); |
| 261 | if (baboon_present) baboon_register_interrupts(); |
| 262 | iop_register_interrupts(); |
| 263 | cpu_request_irq(7, mac_nmi_handler, IRQ_FLG_LOCK, "NMI", |
| 264 | mac_nmi_handler); |
| 265 | #ifdef DEBUG_MACINTS |
| 266 | printk("mac_init_IRQ(): Done!\n"); |
| 267 | #endif |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Routines to work with irq_node_t's on linked lists lifted from |
| 272 | * the Amiga code written by Roman Zippel. |
| 273 | */ |
| 274 | |
| 275 | static inline void mac_insert_irq(irq_node_t **list, irq_node_t *node) |
| 276 | { |
| 277 | unsigned long flags; |
| 278 | irq_node_t *cur; |
| 279 | |
| 280 | if (!node->dev_id) |
| 281 | printk("%s: Warning: dev_id of %s is zero\n", |
| 282 | __FUNCTION__, node->devname); |
| 283 | |
| 284 | local_irq_save(flags); |
| 285 | |
| 286 | cur = *list; |
| 287 | |
| 288 | if (node->flags & IRQ_FLG_FAST) { |
| 289 | node->flags &= ~IRQ_FLG_SLOW; |
| 290 | while (cur && cur->flags & IRQ_FLG_FAST) { |
| 291 | list = &cur->next; |
| 292 | cur = cur->next; |
| 293 | } |
| 294 | } else if (node->flags & IRQ_FLG_SLOW) { |
| 295 | while (cur) { |
| 296 | list = &cur->next; |
| 297 | cur = cur->next; |
| 298 | } |
| 299 | } else { |
| 300 | while (cur && !(cur->flags & IRQ_FLG_SLOW)) { |
| 301 | list = &cur->next; |
| 302 | cur = cur->next; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | node->next = cur; |
| 307 | *list = node; |
| 308 | |
| 309 | local_irq_restore(flags); |
| 310 | } |
| 311 | |
| 312 | static inline void mac_delete_irq(irq_node_t **list, void *dev_id) |
| 313 | { |
| 314 | unsigned long flags; |
| 315 | irq_node_t *node; |
| 316 | |
| 317 | local_irq_save(flags); |
| 318 | |
| 319 | for (node = *list; node; list = &node->next, node = *list) { |
| 320 | if (node->dev_id == dev_id) { |
| 321 | *list = node->next; |
| 322 | /* Mark it as free. */ |
| 323 | node->handler = NULL; |
| 324 | local_irq_restore(flags); |
| 325 | return; |
| 326 | } |
| 327 | } |
| 328 | local_irq_restore(flags); |
| 329 | printk ("%s: tried to remove invalid irq\n", __FUNCTION__); |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * Call all the handlers for a given interrupt. Fast handlers are called |
| 334 | * first followed by slow handlers. |
| 335 | * |
| 336 | * This code taken from the original Amiga code written by Roman Zippel. |
| 337 | */ |
| 338 | |
| 339 | void mac_do_irq_list(int irq, struct pt_regs *fp) |
| 340 | { |
| 341 | irq_node_t *node, *slow_nodes; |
| 342 | unsigned long flags; |
| 343 | |
| 344 | kstat_cpu(0).irqs[irq]++; |
| 345 | |
| 346 | #ifdef DEBUG_SPURIOUS |
| 347 | if (!mac_irq_list[irq] && (console_loglevel > 7)) { |
| 348 | printk("mac_do_irq_list: spurious interrupt %d!\n", irq); |
| 349 | return; |
| 350 | } |
| 351 | #endif |
| 352 | |
| 353 | /* serve first fast and normal handlers */ |
| 354 | for (node = mac_irq_list[irq]; |
| 355 | node && (!(node->flags & IRQ_FLG_SLOW)); |
| 356 | node = node->next) |
| 357 | node->handler(irq, node->dev_id, fp); |
| 358 | if (!node) return; |
| 359 | local_save_flags(flags); |
| 360 | local_irq_restore((flags & ~0x0700) | (fp->sr & 0x0700)); |
| 361 | /* if slow handlers exists, serve them now */ |
| 362 | slow_nodes = node; |
| 363 | for (; node; node = node->next) { |
| 364 | node->handler(irq, node->dev_id, fp); |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * mac_enable_irq - enable an interrupt source |
| 370 | * mac_disable_irq - disable an interrupt source |
| 371 | * mac_clear_irq - clears a pending interrupt |
| 372 | * mac_pending_irq - Returns the pending status of an IRQ (nonzero = pending) |
| 373 | * |
| 374 | * These routines are just dispatchers to the VIA/OSS/PSC routines. |
| 375 | */ |
| 376 | |
| 377 | void mac_enable_irq (unsigned int irq) |
| 378 | { |
| 379 | int irq_src = IRQ_SRC(irq); |
| 380 | |
| 381 | switch(irq_src) { |
| 382 | case 1: via_irq_enable(irq); |
| 383 | break; |
| 384 | case 2: |
| 385 | case 7: if (oss_present) { |
| 386 | oss_irq_enable(irq); |
| 387 | } else { |
| 388 | via_irq_enable(irq); |
| 389 | } |
| 390 | break; |
| 391 | case 3: |
| 392 | case 4: |
| 393 | case 5: |
| 394 | case 6: if (psc_present) { |
| 395 | psc_irq_enable(irq); |
| 396 | } else if (oss_present) { |
| 397 | oss_irq_enable(irq); |
| 398 | } else if (irq_src == 4) { |
| 399 | scc_irq_enable(irq); |
| 400 | } |
| 401 | break; |
| 402 | case 8: if (baboon_present) { |
| 403 | baboon_irq_enable(irq); |
| 404 | } |
| 405 | break; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | void mac_disable_irq (unsigned int irq) |
| 410 | { |
| 411 | int irq_src = IRQ_SRC(irq); |
| 412 | |
| 413 | switch(irq_src) { |
| 414 | case 1: via_irq_disable(irq); |
| 415 | break; |
| 416 | case 2: |
| 417 | case 7: if (oss_present) { |
| 418 | oss_irq_disable(irq); |
| 419 | } else { |
| 420 | via_irq_disable(irq); |
| 421 | } |
| 422 | break; |
| 423 | case 3: |
| 424 | case 4: |
| 425 | case 5: |
| 426 | case 6: if (psc_present) { |
| 427 | psc_irq_disable(irq); |
| 428 | } else if (oss_present) { |
| 429 | oss_irq_disable(irq); |
| 430 | } else if (irq_src == 4) { |
| 431 | scc_irq_disable(irq); |
| 432 | } |
| 433 | break; |
| 434 | case 8: if (baboon_present) { |
| 435 | baboon_irq_disable(irq); |
| 436 | } |
| 437 | break; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | void mac_clear_irq( unsigned int irq ) |
| 442 | { |
| 443 | switch(IRQ_SRC(irq)) { |
| 444 | case 1: via_irq_clear(irq); |
| 445 | break; |
| 446 | case 2: |
| 447 | case 7: if (oss_present) { |
| 448 | oss_irq_clear(irq); |
| 449 | } else { |
| 450 | via_irq_clear(irq); |
| 451 | } |
| 452 | break; |
| 453 | case 3: |
| 454 | case 4: |
| 455 | case 5: |
| 456 | case 6: if (psc_present) { |
| 457 | psc_irq_clear(irq); |
| 458 | } else if (oss_present) { |
| 459 | oss_irq_clear(irq); |
| 460 | } |
| 461 | break; |
| 462 | case 8: if (baboon_present) { |
| 463 | baboon_irq_clear(irq); |
| 464 | } |
| 465 | break; |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | int mac_irq_pending( unsigned int irq ) |
| 470 | { |
| 471 | switch(IRQ_SRC(irq)) { |
| 472 | case 1: return via_irq_pending(irq); |
| 473 | case 2: |
| 474 | case 7: if (oss_present) { |
| 475 | return oss_irq_pending(irq); |
| 476 | } else { |
| 477 | return via_irq_pending(irq); |
| 478 | } |
| 479 | case 3: |
| 480 | case 4: |
| 481 | case 5: |
| 482 | case 6: if (psc_present) { |
| 483 | return psc_irq_pending(irq); |
| 484 | } else if (oss_present) { |
| 485 | return oss_irq_pending(irq); |
| 486 | } |
| 487 | } |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Add an interrupt service routine to an interrupt source. |
| 493 | * Returns 0 on success. |
| 494 | * |
| 495 | * FIXME: You can register interrupts on nonexistent source (ie PSC4 on a |
| 496 | * non-PSC machine). We should return -EINVAL in those cases. |
| 497 | */ |
| 498 | |
| 499 | int mac_request_irq(unsigned int irq, |
| 500 | irqreturn_t (*handler)(int, void *, struct pt_regs *), |
| 501 | unsigned long flags, const char *devname, void *dev_id) |
| 502 | { |
| 503 | irq_node_t *node; |
| 504 | |
| 505 | #ifdef DEBUG_MACINTS |
| 506 | printk ("%s: irq %d requested for %s\n", __FUNCTION__, irq, devname); |
| 507 | #endif |
| 508 | |
| 509 | if (irq < VIA1_SOURCE_BASE) { |
| 510 | return cpu_request_irq(irq, handler, flags, devname, dev_id); |
| 511 | } |
| 512 | |
| 513 | if (irq >= NUM_MAC_SOURCES) { |
| 514 | printk ("%s: unknown irq %d requested by %s\n", |
| 515 | __FUNCTION__, irq, devname); |
| 516 | } |
| 517 | |
| 518 | /* Get a node and stick it onto the right list */ |
| 519 | |
| 520 | if (!(node = new_irq_node())) return -ENOMEM; |
| 521 | |
| 522 | node->handler = handler; |
| 523 | node->flags = flags; |
| 524 | node->dev_id = dev_id; |
| 525 | node->devname = devname; |
| 526 | node->next = NULL; |
| 527 | mac_insert_irq(&mac_irq_list[irq], node); |
| 528 | |
| 529 | /* Now enable the IRQ source */ |
| 530 | |
| 531 | mac_enable_irq(irq); |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Removes an interrupt service routine from an interrupt source. |
| 538 | */ |
| 539 | |
| 540 | void mac_free_irq(unsigned int irq, void *dev_id) |
| 541 | { |
| 542 | #ifdef DEBUG_MACINTS |
| 543 | printk ("%s: irq %d freed by %p\n", __FUNCTION__, irq, dev_id); |
| 544 | #endif |
| 545 | |
| 546 | if (irq < VIA1_SOURCE_BASE) { |
| 547 | cpu_free_irq(irq, dev_id); |
| 548 | return; |
| 549 | } |
| 550 | |
| 551 | if (irq >= NUM_MAC_SOURCES) { |
| 552 | printk ("%s: unknown irq %d freed\n", |
| 553 | __FUNCTION__, irq); |
| 554 | return; |
| 555 | } |
| 556 | |
| 557 | mac_delete_irq(&mac_irq_list[irq], dev_id); |
| 558 | |
| 559 | /* If the list for this interrupt is */ |
| 560 | /* empty then disable the source. */ |
| 561 | |
| 562 | if (!mac_irq_list[irq]) { |
| 563 | mac_disable_irq(irq); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * Generate a pretty listing for /proc/interrupts |
| 569 | * |
| 570 | * By the time we're called the autovector interrupt list has already been |
| 571 | * generated, so we just need to do the machspec interrupts. |
| 572 | * |
| 573 | * 990506 (jmt) - rewritten to handle chained machspec interrupt handlers. |
| 574 | * Also removed display of num_spurious it is already |
| 575 | * displayed for us as autovector irq 0. |
| 576 | */ |
| 577 | |
| 578 | int show_mac_interrupts(struct seq_file *p, void *v) |
| 579 | { |
| 580 | int i; |
| 581 | irq_node_t *node; |
| 582 | char *base; |
| 583 | |
| 584 | /* Don't do Nubus interrupts in this loop; we do them separately */ |
| 585 | /* below so that we can print slot numbers instead of IRQ numbers */ |
| 586 | |
| 587 | for (i = VIA1_SOURCE_BASE ; i < NUM_MAC_SOURCES ; ++i) { |
| 588 | |
| 589 | /* Nonexistant interrupt or nothing registered; skip it. */ |
| 590 | |
| 591 | if ((node = mac_irq_list[i]) == NULL) continue; |
| 592 | if (node->flags & IRQ_FLG_STD) continue; |
| 593 | |
| 594 | base = ""; |
| 595 | switch(IRQ_SRC(i)) { |
| 596 | case 1: base = "via1"; |
| 597 | break; |
| 598 | case 2: if (oss_present) { |
| 599 | base = "oss"; |
| 600 | } else { |
| 601 | base = "via2"; |
| 602 | } |
| 603 | break; |
| 604 | case 3: |
| 605 | case 4: |
| 606 | case 5: |
| 607 | case 6: if (psc_present) { |
| 608 | base = "psc"; |
| 609 | } else if (oss_present) { |
| 610 | base = "oss"; |
| 611 | } else { |
| 612 | if (IRQ_SRC(i) == 4) base = "scc"; |
| 613 | } |
| 614 | break; |
| 615 | case 7: base = "nbus"; |
| 616 | break; |
| 617 | case 8: base = "bbn"; |
| 618 | break; |
| 619 | } |
| 620 | seq_printf(p, "%4s %2d: %10u ", base, i, kstat_cpu(0).irqs[i]); |
| 621 | |
| 622 | do { |
| 623 | if (node->flags & IRQ_FLG_FAST) { |
| 624 | seq_puts(p, "F "); |
| 625 | } else if (node->flags & IRQ_FLG_SLOW) { |
| 626 | seq_puts(p, "S "); |
| 627 | } else { |
| 628 | seq_puts(p, " "); |
| 629 | } |
| 630 | seq_printf(p, "%s\n", node->devname); |
| 631 | if ((node = node->next)) { |
| 632 | seq_puts(p, " "); |
| 633 | } |
| 634 | } while(node); |
| 635 | |
| 636 | } |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | void mac_default_handler(int irq, void *dev_id, struct pt_regs *regs) |
| 641 | { |
| 642 | #ifdef DEBUG_SPURIOUS |
| 643 | printk("Unexpected IRQ %d on device %p\n", irq, dev_id); |
| 644 | #endif |
| 645 | } |
| 646 | |
| 647 | static int num_debug[8]; |
| 648 | |
| 649 | irqreturn_t mac_debug_handler(int irq, void *dev_id, struct pt_regs *regs) |
| 650 | { |
| 651 | if (num_debug[irq] < 10) { |
| 652 | printk("DEBUG: Unexpected IRQ %d\n", irq); |
| 653 | num_debug[irq]++; |
| 654 | } |
| 655 | return IRQ_HANDLED; |
| 656 | } |
| 657 | |
| 658 | static int in_nmi; |
| 659 | static volatile int nmi_hold; |
| 660 | |
| 661 | irqreturn_t mac_nmi_handler(int irq, void *dev_id, struct pt_regs *fp) |
| 662 | { |
| 663 | int i; |
| 664 | /* |
| 665 | * generate debug output on NMI switch if 'debug' kernel option given |
| 666 | * (only works with Penguin!) |
| 667 | */ |
| 668 | |
| 669 | in_nmi++; |
| 670 | for (i=0; i<100; i++) |
| 671 | udelay(1000); |
| 672 | |
| 673 | if (in_nmi == 1) { |
| 674 | nmi_hold = 1; |
| 675 | printk("... pausing, press NMI to resume ..."); |
| 676 | } else { |
| 677 | printk(" ok!\n"); |
| 678 | nmi_hold = 0; |
| 679 | } |
| 680 | |
| 681 | barrier(); |
| 682 | |
| 683 | while (nmi_hold == 1) |
| 684 | udelay(1000); |
| 685 | |
| 686 | if ( console_loglevel >= 8 ) { |
| 687 | #if 0 |
| 688 | show_state(); |
| 689 | printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp); |
| 690 | printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", |
| 691 | fp->d0, fp->d1, fp->d2, fp->d3); |
| 692 | printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n", |
| 693 | fp->d4, fp->d5, fp->a0, fp->a1); |
| 694 | |
| 695 | if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page) |
| 696 | printk("Corrupted stack page\n"); |
| 697 | printk("Process %s (pid: %d, stackpage=%08lx)\n", |
| 698 | current->comm, current->pid, current->kernel_stack_page); |
| 699 | if (intr_count == 1) |
| 700 | dump_stack((struct frame *)fp); |
| 701 | #else |
| 702 | /* printk("NMI "); */ |
| 703 | #endif |
| 704 | } |
| 705 | in_nmi--; |
| 706 | return IRQ_HANDLED; |
| 707 | } |
| 708 | |
| 709 | /* |
| 710 | * Simple routines for masking and unmasking |
| 711 | * SCC interrupts in cases where this can't be |
| 712 | * done in hardware (only the PSC can do that.) |
| 713 | */ |
| 714 | |
| 715 | static void scc_irq_enable(int irq) { |
| 716 | int irq_idx = IRQ_IDX(irq); |
| 717 | |
| 718 | scc_mask |= (1 << irq_idx); |
| 719 | } |
| 720 | |
| 721 | static void scc_irq_disable(int irq) { |
| 722 | int irq_idx = IRQ_IDX(irq); |
| 723 | |
| 724 | scc_mask &= ~(1 << irq_idx); |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * SCC master interrupt handler. We have to do a bit of magic here |
| 729 | * to figure out what channel gave us the interrupt; putting this |
| 730 | * here is cleaner than hacking it into drivers/char/macserial.c. |
| 731 | */ |
| 732 | |
| 733 | void mac_scc_dispatch(int irq, void *dev_id, struct pt_regs *regs) |
| 734 | { |
| 735 | volatile unsigned char *scc = (unsigned char *) mac_bi_data.sccbase + 2; |
| 736 | unsigned char reg; |
| 737 | unsigned long flags; |
| 738 | |
| 739 | /* Read RR3 from the chip. Always do this on channel A */ |
| 740 | /* This must be an atomic operation so disable irqs. */ |
| 741 | |
| 742 | local_irq_save(flags); |
| 743 | *scc = 3; |
| 744 | reg = *scc; |
| 745 | local_irq_restore(flags); |
| 746 | |
| 747 | /* Now dispatch. Bits 0-2 are for channel B and */ |
| 748 | /* bits 3-5 are for channel A. We can safely */ |
| 749 | /* ignore the remaining bits here. */ |
| 750 | /* */ |
| 751 | /* Note that we're ignoring scc_mask for now. */ |
| 752 | /* If we actually mask the ints then we tend to */ |
| 753 | /* get hammered by very persistent SCC irqs, */ |
| 754 | /* and since they're autovector interrupts they */ |
| 755 | /* pretty much kill the system. */ |
| 756 | |
| 757 | if (reg & 0x38) mac_do_irq_list(IRQ_SCCA, regs); |
| 758 | if (reg & 0x07) mac_do_irq_list(IRQ_SCCB, regs); |
| 759 | } |