1 /* 2 * arch/m68k/atari/ataints.c -- Atari Linux interrupt handling code 3 * 4 * 5/2/94 Roman Hodek: 5 * Added support for TT interrupts; setup for TT SCU (may someone has 6 * twiddled there and we won't get the right interrupts :-() 7 * 8 * Major change: The device-independent code in m68k/ints.c didn't know 9 * about non-autovec ints yet. It hardcoded the number of possible ints to 10 * 7 (IRQ1...IRQ7). But the Atari has lots of non-autovec ints! I made the 11 * number of possible ints a constant defined in interrupt.h, which is 12 * 47 for the Atari. So we can call request_irq() for all Atari interrupts 13 * just the normal way. Additionally, all vectors >= 48 are initialized to 14 * call trap() instead of inthandler(). This must be changed here, too. 15 * 16 * 1995-07-16 Lars Brinkhoff <f93labr@dd.chalmers.se>: 17 * Corrected a bug in atari_add_isr() which rejected all SCC 18 * interrupt sources if there were no TT MFP! 19 * 20 * 12/13/95: New interface functions atari_level_triggered_int() and 21 * atari_register_vme_int() as support for level triggered VME interrupts. 22 * 23 * 02/12/96: (Roman) 24 * Total rewrite of Atari interrupt handling, for new scheme see comments 25 * below. 26 * 27 * 1996-09-03 lars brinkhoff <f93labr@dd.chalmers.se>: 28 * Added new function atari_unregister_vme_int(), and 29 * modified atari_register_vme_int() as well as IS_VALID_INTNO() 30 * to work with it. 31 * 32 * This file is subject to the terms and conditions of the GNU General Public 33 * License. See the file COPYING in the main directory of this archive 34 * for more details. 35 * 36 */ 37 38 #include <linux/types.h> 39 #include <linux/kernel.h> 40 #include <linux/kernel_stat.h> 41 #include <linux/init.h> 42 #include <linux/seq_file.h> 43 44 #include <asm/system.h> 45 #include <asm/traps.h> 46 47 #include <asm/atarihw.h> 48 #include <asm/atariints.h> 49 #include <asm/atari_stdma.h> 50 #include <asm/irq.h> 51 #include <asm/entry.h> 52 53 54 /* 55 * Atari interrupt handling scheme: 56 * -------------------------------- 57 * 58 * All interrupt source have an internal number (defined in 59 * <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP, 60 * TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can 61 * be allocated by atari_register_vme_int(). 62 * 63 * Each interrupt can be of three types: 64 * 65 * - SLOW: The handler runs with all interrupts enabled, except the one it 66 * was called by (to avoid reentering). This should be the usual method. 67 * But it is currently possible only for MFP ints, since only the MFP 68 * offers an easy way to mask interrupts. 69 * 70 * - FAST: The handler runs with all interrupts disabled. This should be used 71 * only for really fast handlers, that just do actions immediately 72 * necessary, and let the rest do a bottom half or task queue. 73 * 74 * - PRIORITIZED: The handler can be interrupted by higher-level ints 75 * (greater IPL, no MFP priorities!). This is the method of choice for ints 76 * which should be slow, but are not from a MFP. 77 * 78 * The feature of more than one handler for one int source is still there, but 79 * only applicable if all handers are of the same type. To not slow down 80 * processing of ints with only one handler by the chaining feature, the list 81 * calling function atari_call_irq_list() is only plugged in at the time the 82 * second handler is registered. 83 * 84 * Implementation notes: For fast-as-possible int handling, there are separate 85 * entry points for each type (slow/fast/prio). The assembler handler calls 86 * the irq directly in the usual case, no C wrapper is involved. In case of 87 * multiple handlers, atari_call_irq_list() is registered as handler and calls 88 * in turn the real irq's. To ease access from assembler level to the irq 89 * function pointer and accompanying data, these two are stored in a separate 90 * array, irq_handler[]. The rest of data (type, name) are put into a second 91 * array, irq_param, that is accessed from C only. For each slow interrupt (32 92 * in all) there are separate handler functions, which makes it possible to 93 * hard-code the MFP register address and value, are necessary to mask the 94 * int. If there'd be only one generic function, lots of calculations would be 95 * needed to determine MFP register and int mask from the vector number :-( 96 * 97 * Furthermore, slow ints may not lower the IPL below its previous value 98 * (before the int happened). This is needed so that an int of class PRIO, on 99 * that this int may be stacked, cannot be reentered. This feature is 100 * implemented as follows: If the stack frame format is 1 (throwaway), the int 101 * is not stacked, and the IPL is anded with 0xfbff, resulting in a new level 102 * 2, which still blocks the HSYNC, but no interrupts of interest. If the 103 * frame format is 0, the int is nested, and the old IPL value can be found in 104 * the sr copy in the frame. 105 */ 106 107 108 #define NUM_INT_SOURCES (8 + NUM_ATARI_SOURCES) 109 110 typedef void (*asm_irq_handler)(void); 111 112 struct irqhandler { 113 irqreturn_t (*handler)(int, void *, struct pt_regs *); 114 void *dev_id; 115 }; 116 117 struct irqparam { 118 unsigned long flags; 119 const char *devname; 120 }; 121 122 /* 123 * Array with irq's and their parameter data. This array is accessed from low 124 * level assembler code, so an element size of 8 allows usage of index scaling 125 * addressing mode. 126 */ 127 static struct irqhandler irq_handler[NUM_INT_SOURCES]; 128 129 /* 130 * This array hold the rest of parameters of int handlers: type 131 * (slow,fast,prio) and the name of the handler. These values are only 132 * accessed from C 133 */ 134 static struct irqparam irq_param[NUM_INT_SOURCES]; 135 136 /* 137 * Bitmap for free interrupt vector numbers 138 * (new vectors starting from 0x70 can be allocated by 139 * atari_register_vme_int()) 140 */ 141 static int free_vme_vec_bitmap; 142 143 /* check for valid int number (complex, sigh...) */ 144 #define IS_VALID_INTNO(n) \ 145 ((n) > 0 && \ 146 /* autovec and ST-MFP ok anyway */ \ 147 (((n) < TTMFP_SOURCE_BASE) || \ 148 /* TT-MFP ok if present */ \ 149 ((n) >= TTMFP_SOURCE_BASE && (n) < SCC_SOURCE_BASE && \ 150 ATARIHW_PRESENT(TT_MFP)) || \ 151 /* SCC ok if present and number even */ \ 152 ((n) >= SCC_SOURCE_BASE && (n) < VME_SOURCE_BASE && \ 153 !((n) & 1) && ATARIHW_PRESENT(SCC)) || \ 154 /* greater numbers ok if they are registered VME vectors */ \ 155 ((n) >= VME_SOURCE_BASE && (n) < VME_SOURCE_BASE + VME_MAX_SOURCES && \ 156 free_vme_vec_bitmap & (1 << ((n) - VME_SOURCE_BASE))))) 157 158 159 /* 160 * Here start the assembler entry points for interrupts 161 */ 162 163 #define IRQ_NAME(nr) atari_slow_irq_##nr##_handler(void) 164 165 #define BUILD_SLOW_IRQ(n) \ 166 asmlinkage void IRQ_NAME(n); \ 167 /* Dummy function to allow asm with operands. */ \ 168 void atari_slow_irq_##n##_dummy (void) { \ 169 __asm__ (__ALIGN_STR "\n" \ 170 "atari_slow_irq_" #n "_handler:\t" \ 171 " addl %6,%5\n" /* preempt_count() += HARDIRQ_OFFSET */ \ 172 SAVE_ALL_INT "\n" \ 173 GET_CURRENT(%%d0) "\n" \ 174 " andb #~(1<<(%c3&7)),%a4:w\n" /* mask this interrupt */ \ 175 /* get old IPL from stack frame */ \ 176 " bfextu %%sp@(%c2){#5,#3},%%d0\n" \ 177 " movew %%sr,%%d1\n" \ 178 " bfins %%d0,%%d1{#21,#3}\n" \ 179 " movew %%d1,%%sr\n" /* set IPL = previous value */ \ 180 " addql #1,%a0\n" \ 181 " lea %a1,%%a0\n" \ 182 " pea %%sp@\n" /* push addr of frame */ \ 183 " movel %%a0@(4),%%sp@-\n" /* push handler data */ \ 184 " pea (%c3+8)\n" /* push int number */ \ 185 " movel %%a0@,%%a0\n" \ 186 " jbsr %%a0@\n" /* call the handler */ \ 187 " addql #8,%%sp\n" \ 188 " addql #4,%%sp\n" \ 189 " orw #0x0600,%%sr\n" \ 190 " andw #0xfeff,%%sr\n" /* set IPL = 6 again */ \ 191 " orb #(1<<(%c3&7)),%a4:w\n" /* now unmask the int again */ \ 192 " jbra ret_from_interrupt\n" \ 193 : : "i" (&kstat_cpu(0).irqs[n+8]), "i" (&irq_handler[n+8]), \ 194 "n" (PT_OFF_SR), "n" (n), \ 195 "i" (n & 8 ? (n & 16 ? &tt_mfp.int_mk_a : &mfp.int_mk_a) \ 196 : (n & 16 ? &tt_mfp.int_mk_b : &mfp.int_mk_b)), \ 197 "m" (preempt_count()), "di" (HARDIRQ_OFFSET) \ 198 ); \ 199 for (;;); /* fake noreturn */ \ 200 } 201 202 BUILD_SLOW_IRQ(0); 203 BUILD_SLOW_IRQ(1); 204 BUILD_SLOW_IRQ(2); 205 BUILD_SLOW_IRQ(3); 206 BUILD_SLOW_IRQ(4); 207 BUILD_SLOW_IRQ(5); 208 BUILD_SLOW_IRQ(6); 209 BUILD_SLOW_IRQ(7); 210 BUILD_SLOW_IRQ(8); 211 BUILD_SLOW_IRQ(9); 212 BUILD_SLOW_IRQ(10); 213 BUILD_SLOW_IRQ(11); 214 BUILD_SLOW_IRQ(12); 215 BUILD_SLOW_IRQ(13); 216 BUILD_SLOW_IRQ(14); 217 BUILD_SLOW_IRQ(15); 218 BUILD_SLOW_IRQ(16); 219 BUILD_SLOW_IRQ(17); 220 BUILD_SLOW_IRQ(18); 221 BUILD_SLOW_IRQ(19); 222 BUILD_SLOW_IRQ(20); 223 BUILD_SLOW_IRQ(21); 224 BUILD_SLOW_IRQ(22); 225 BUILD_SLOW_IRQ(23); 226 BUILD_SLOW_IRQ(24); 227 BUILD_SLOW_IRQ(25); 228 BUILD_SLOW_IRQ(26); 229 BUILD_SLOW_IRQ(27); 230 BUILD_SLOW_IRQ(28); 231 BUILD_SLOW_IRQ(29); 232 BUILD_SLOW_IRQ(30); 233 BUILD_SLOW_IRQ(31); 234 235 asm_irq_handler slow_handlers[32] = { 236 [0] = atari_slow_irq_0_handler, 237 [1] = atari_slow_irq_1_handler, 238 [2] = atari_slow_irq_2_handler, 239 [3] = atari_slow_irq_3_handler, 240 [4] = atari_slow_irq_4_handler, 241 [5] = atari_slow_irq_5_handler, 242 [6] = atari_slow_irq_6_handler, 243 [7] = atari_slow_irq_7_handler, 244 [8] = atari_slow_irq_8_handler, 245 [9] = atari_slow_irq_9_handler, 246 [10] = atari_slow_irq_10_handler, 247 [11] = atari_slow_irq_11_handler, 248 [12] = atari_slow_irq_12_handler, 249 [13] = atari_slow_irq_13_handler, 250 [14] = atari_slow_irq_14_handler, 251 [15] = atari_slow_irq_15_handler, 252 [16] = atari_slow_irq_16_handler, 253 [17] = atari_slow_irq_17_handler, 254 [18] = atari_slow_irq_18_handler, 255 [19] = atari_slow_irq_19_handler, 256 [20] = atari_slow_irq_20_handler, 257 [21] = atari_slow_irq_21_handler, 258 [22] = atari_slow_irq_22_handler, 259 [23] = atari_slow_irq_23_handler, 260 [24] = atari_slow_irq_24_handler, 261 [25] = atari_slow_irq_25_handler, 262 [26] = atari_slow_irq_26_handler, 263 [27] = atari_slow_irq_27_handler, 264 [28] = atari_slow_irq_28_handler, 265 [29] = atari_slow_irq_29_handler, 266 [30] = atari_slow_irq_30_handler, 267 [31] = atari_slow_irq_31_handler 268 }; 269 270 asmlinkage void atari_fast_irq_handler( void ); 271 asmlinkage void atari_prio_irq_handler( void ); 272 273 /* Dummy function to allow asm with operands. */ 274 void atari_fast_prio_irq_dummy (void) { 275 __asm__ (__ALIGN_STR "\n" 276 "atari_fast_irq_handler:\n\t" 277 "orw #0x700,%%sr\n" /* disable all interrupts */ 278 "atari_prio_irq_handler:\n\t" 279 "addl %3,%2\n\t" /* preempt_count() += HARDIRQ_OFFSET */ 280 SAVE_ALL_INT "\n\t" 281 GET_CURRENT(%%d0) "\n\t" 282 /* get vector number from stack frame and convert to source */ 283 "bfextu %%sp@(%c1){#4,#10},%%d0\n\t" 284 "subw #(0x40-8),%%d0\n\t" 285 "jpl 1f\n\t" 286 "addw #(0x40-8-0x18),%%d0\n" 287 "1:\tlea %a0,%%a0\n\t" 288 "addql #1,%%a0@(%%d0:l:4)\n\t" 289 "lea irq_handler,%%a0\n\t" 290 "lea %%a0@(%%d0:l:8),%%a0\n\t" 291 "pea %%sp@\n\t" /* push frame address */ 292 "movel %%a0@(4),%%sp@-\n\t" /* push handler data */ 293 "movel %%d0,%%sp@-\n\t" /* push int number */ 294 "movel %%a0@,%%a0\n\t" 295 "jsr %%a0@\n\t" /* and call the handler */ 296 "addql #8,%%sp\n\t" 297 "addql #4,%%sp\n\t" 298 "jbra ret_from_interrupt" 299 : : "i" (&kstat_cpu(0).irqs), "n" (PT_OFF_FORMATVEC), 300 "m" (preempt_count()), "di" (HARDIRQ_OFFSET) 301 ); 302 for (;;); 303 } 304 305 /* GK: 306 * HBL IRQ handler for Falcon. Nobody needs it :-) 307 * ++andreas: raise ipl to disable further HBLANK interrupts. 308 */ 309 asmlinkage void falcon_hblhandler(void); 310 asm(".text\n" 311 __ALIGN_STR "\n\t" 312 "falcon_hblhandler:\n\t" 313 "orw #0x200,%sp@\n\t" /* set saved ipl to 2 */ 314 "rte"); 315 316 /* Defined in entry.S; only increments 'num_spurious' */ 317 asmlinkage void bad_interrupt(void); 318 319 extern void atari_microwire_cmd( int cmd ); 320 321 extern int atari_SCC_reset_done; 322 323 /* 324 * void atari_init_IRQ (void) 325 * 326 * Parameters: None 327 * 328 * Returns: Nothing 329 * 330 * This function should be called during kernel startup to initialize 331 * the atari IRQ handling routines. 332 */ 333 334 void __init atari_init_IRQ(void) 335 { 336 int i; 337 338 /* initialize the vector table */ 339 for (i = 0; i < NUM_INT_SOURCES; ++i) { 340 vectors[IRQ_SOURCE_TO_VECTOR(i)] = bad_interrupt; 341 } 342 343 /* Initialize the MFP(s) */ 344 345 #ifdef ATARI_USE_SOFTWARE_EOI 346 mfp.vec_adr = 0x48; /* Software EOI-Mode */ 347 #else 348 mfp.vec_adr = 0x40; /* Automatic EOI-Mode */ 349 #endif 350 mfp.int_en_a = 0x00; /* turn off MFP-Ints */ 351 mfp.int_en_b = 0x00; 352 mfp.int_mk_a = 0xff; /* no Masking */ 353 mfp.int_mk_b = 0xff; 354 355 if (ATARIHW_PRESENT(TT_MFP)) { 356 #ifdef ATARI_USE_SOFTWARE_EOI 357 tt_mfp.vec_adr = 0x58; /* Software EOI-Mode */ 358 #else 359 tt_mfp.vec_adr = 0x50; /* Automatic EOI-Mode */ 360 #endif 361 tt_mfp.int_en_a = 0x00; /* turn off MFP-Ints */ 362 tt_mfp.int_en_b = 0x00; 363 tt_mfp.int_mk_a = 0xff; /* no Masking */ 364 tt_mfp.int_mk_b = 0xff; 365 } 366 367 if (ATARIHW_PRESENT(SCC) && !atari_SCC_reset_done) { 368 scc.cha_a_ctrl = 9; 369 MFPDELAY(); 370 scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */ 371 } 372 373 if (ATARIHW_PRESENT(SCU)) { 374 /* init the SCU if present */ 375 tt_scu.sys_mask = 0x10; /* enable VBL (for the cursor) and 376 * disable HSYNC interrupts (who 377 * needs them?) MFP and SCC are 378 * enabled in VME mask 379 */ 380 tt_scu.vme_mask = 0x60; /* enable MFP and SCC ints */ 381 } 382 else { 383 /* If no SCU and no Hades, the HSYNC interrupt needs to be 384 * disabled this way. (Else _inthandler in kernel/sys_call.S 385 * gets overruns) 386 */ 387 388 if (!MACH_IS_HADES) 389 vectors[VEC_INT2] = falcon_hblhandler; 390 } 391 392 if (ATARIHW_PRESENT(PCM_8BIT) && ATARIHW_PRESENT(MICROWIRE)) { 393 /* Initialize the LM1992 Sound Controller to enable 394 the PSG sound. This is misplaced here, it should 395 be in an atasound_init(), that doesn't exist yet. */ 396 atari_microwire_cmd(MW_LM1992_PSG_HIGH); 397 } 398 399 stdma_init(); 400 401 /* Initialize the PSG: all sounds off, both ports output */ 402 sound_ym.rd_data_reg_sel = 7; 403 sound_ym.wd_data = 0xff; 404 } 405 406 407 static irqreturn_t atari_call_irq_list( int irq, void *dev_id, struct pt_regs *fp ) 408 { 409 irq_node_t *node; 410 411 for (node = (irq_node_t *)dev_id; node; node = node->next) 412 node->handler(irq, node->dev_id, fp); 413 return IRQ_HANDLED; 414 } 415 416 417 /* 418 * atari_request_irq : add an interrupt service routine for a particular 419 * machine specific interrupt source. 420 * If the addition was successful, it returns 0. 421 */ 422 423 int atari_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), 424 unsigned long flags, const char *devname, void *dev_id) 425 { 426 int vector; 427 unsigned long oflags = flags; 428 429 /* 430 * The following is a hack to make some PCI card drivers work, 431 * which set the SA_SHIRQ flag. 432 */ 433 434 flags &= ~SA_SHIRQ; 435 436 if (flags == SA_INTERRUPT) { 437 printk ("%s: SA_INTERRUPT changed to IRQ_TYPE_SLOW for %s\n", 438 __FUNCTION__, devname); 439 flags = IRQ_TYPE_SLOW; 440 } 441 if (flags < IRQ_TYPE_SLOW || flags > IRQ_TYPE_PRIO) { 442 printk ("%s: Bad irq type 0x%lx <0x%lx> requested from %s\n", 443 __FUNCTION__, flags, oflags, devname); 444 return -EINVAL; 445 } 446 if (!IS_VALID_INTNO(irq)) { 447 printk ("%s: Unknown irq %d requested from %s\n", 448 __FUNCTION__, irq, devname); 449 return -ENXIO; 450 } 451 vector = IRQ_SOURCE_TO_VECTOR(irq); 452 453 /* 454 * Check type/source combination: slow ints are (currently) 455 * only possible for MFP-interrupts. 456 */ 457 if (flags == IRQ_TYPE_SLOW && 458 (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE)) { 459 printk ("%s: Slow irq requested for non-MFP source %d from %s\n", 460 __FUNCTION__, irq, devname); 461 return -EINVAL; 462 } 463 464 if (vectors[vector] == bad_interrupt) { 465 /* int has no handler yet */ 466 irq_handler[irq].handler = handler; 467 irq_handler[irq].dev_id = dev_id; 468 irq_param[irq].flags = flags; 469 irq_param[irq].devname = devname; 470 vectors[vector] = 471 (flags == IRQ_TYPE_SLOW) ? slow_handlers[irq-STMFP_SOURCE_BASE] : 472 (flags == IRQ_TYPE_FAST) ? atari_fast_irq_handler : 473 atari_prio_irq_handler; 474 /* If MFP int, also enable and umask it */ 475 atari_turnon_irq(irq); 476 atari_enable_irq(irq); 477 478 return 0; 479 } 480 else if (irq_param[irq].flags == flags) { 481 /* old handler is of same type -> handlers can be chained */ 482 irq_node_t *node; 483 unsigned long flags; 484 485 local_irq_save(flags); 486 487 if (irq_handler[irq].handler != atari_call_irq_list) { 488 /* Only one handler yet, make a node for this first one */ 489 if (!(node = new_irq_node())) 490 return -ENOMEM; 491 node->handler = irq_handler[irq].handler; 492 node->dev_id = irq_handler[irq].dev_id; 493 node->devname = irq_param[irq].devname; 494 node->next = NULL; 495 496 irq_handler[irq].handler = atari_call_irq_list; 497 irq_handler[irq].dev_id = node; 498 irq_param[irq].devname = "chained"; 499 } 500 501 if (!(node = new_irq_node())) 502 return -ENOMEM; 503 node->handler = handler; 504 node->dev_id = dev_id; 505 node->devname = devname; 506 /* new handlers are put in front of the queue */ 507 node->next = irq_handler[irq].dev_id; 508 irq_handler[irq].dev_id = node; 509 510 local_irq_restore(flags); 511 return 0; 512 } else { 513 printk ("%s: Irq %d allocated by other type int (call from %s)\n", 514 __FUNCTION__, irq, devname); 515 return -EBUSY; 516 } 517 } 518 519 void atari_free_irq(unsigned int irq, void *dev_id) 520 { 521 unsigned long flags; 522 int vector; 523 irq_node_t **list, *node; 524 525 if (!IS_VALID_INTNO(irq)) { 526 printk("%s: Unknown irq %d\n", __FUNCTION__, irq); 527 return; 528 } 529 530 vector = IRQ_SOURCE_TO_VECTOR(irq); 531 if (vectors[vector] == bad_interrupt) 532 goto not_found; 533 534 local_irq_save(flags); 535 536 if (irq_handler[irq].handler != atari_call_irq_list) { 537 /* It's the only handler for the interrupt */ 538 if (irq_handler[irq].dev_id != dev_id) { 539 local_irq_restore(flags); 540 goto not_found; 541 } 542 irq_handler[irq].handler = NULL; 543 irq_handler[irq].dev_id = NULL; 544 irq_param[irq].devname = NULL; 545 vectors[vector] = bad_interrupt; 546 /* If MFP int, also disable it */ 547 atari_disable_irq(irq); 548 atari_turnoff_irq(irq); 549 550 local_irq_restore(flags); 551 return; 552 } 553 554 /* The interrupt is chained, find the irq on the list */ 555 for(list = (irq_node_t **)&irq_handler[irq].dev_id; *list; list = &(*list)->next) { 556 if ((*list)->dev_id == dev_id) break; 557 } 558 if (!*list) { 559 local_irq_restore(flags); 560 goto not_found; 561 } 562 563 (*list)->handler = NULL; /* Mark it as free for reallocation */ 564 *list = (*list)->next; 565 566 /* If there's now only one handler, unchain the interrupt, i.e. plug in 567 * the handler directly again and omit atari_call_irq_list */ 568 node = (irq_node_t *)irq_handler[irq].dev_id; 569 if (node && !node->next) { 570 irq_handler[irq].handler = node->handler; 571 irq_handler[irq].dev_id = node->dev_id; 572 irq_param[irq].devname = node->devname; 573 node->handler = NULL; /* Mark it as free for reallocation */ 574 } 575 576 local_irq_restore(flags); 577 return; 578 579 not_found: 580 printk("%s: tried to remove invalid irq\n", __FUNCTION__); 581 return; 582 } 583 584 585 /* 586 * atari_register_vme_int() returns the number of a free interrupt vector for 587 * hardware with a programmable int vector (probably a VME board). 588 */ 589 590 unsigned long atari_register_vme_int(void) 591 { 592 int i; 593 594 for(i = 0; i < 32; i++) 595 if((free_vme_vec_bitmap & (1 << i)) == 0) 596 break; 597 598 if(i == 16) 599 return 0; 600 601 free_vme_vec_bitmap |= 1 << i; 602 return (VME_SOURCE_BASE + i); 603 } 604 605 606 void atari_unregister_vme_int(unsigned long irq) 607 { 608 if(irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) { 609 irq -= VME_SOURCE_BASE; 610 free_vme_vec_bitmap &= ~(1 << irq); 611 } 612 } 613 614 615 int show_atari_interrupts(struct seq_file *p, void *v) 616 { 617 int i; 618 619 for (i = 0; i < NUM_INT_SOURCES; ++i) { 620 if (vectors[IRQ_SOURCE_TO_VECTOR(i)] == bad_interrupt) 621 continue; 622 if (i < STMFP_SOURCE_BASE) 623 seq_printf(p, "auto %2d: %10u ", 624 i, kstat_cpu(0).irqs[i]); 625 else 626 seq_printf(p, "vec $%02x: %10u ", 627 IRQ_SOURCE_TO_VECTOR(i), 628 kstat_cpu(0).irqs[i]); 629 630 if (irq_handler[i].handler != atari_call_irq_list) { 631 seq_printf(p, "%s\n", irq_param[i].devname); 632 } 633 else { 634 irq_node_t *n; 635 for( n = (irq_node_t *)irq_handler[i].dev_id; n; n = n->next ) { 636 seq_printf(p, "%s\n", n->devname); 637 if (n->next) 638 seq_puts(p, " " ); 639 } 640 } 641 } 642 if (num_spurious) 643 seq_printf(p, "spurio.: %10u\n", num_spurious); 644 645 return 0; 646 } 647 648 649