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/ptrace.h>
41 #include <linux/kernel_stat.h>
42 #include <linux/init.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 void (*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 = 0;
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 SYMBOL_NAME_STR(atari_slow_irq_) #n "_handler:\t" \
171 " addql #1,%5\n" /* local_irq_count++ */ \
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 "SYMBOL_NAME_STR(ret_from_interrupt)"\n" \
193 : : "i" (&kstat.irqs[0][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" (local_irq_count(0)) \
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 atari_slow_irq_0_handler,
237 atari_slow_irq_1_handler,
238 atari_slow_irq_2_handler,
239 atari_slow_irq_3_handler,
240 atari_slow_irq_4_handler,
241 atari_slow_irq_5_handler,
242 atari_slow_irq_6_handler,
243 atari_slow_irq_7_handler,
244 atari_slow_irq_8_handler,
245 atari_slow_irq_9_handler,
246 atari_slow_irq_10_handler,
247 atari_slow_irq_11_handler,
248 atari_slow_irq_12_handler,
249 atari_slow_irq_13_handler,
250 atari_slow_irq_14_handler,
251 atari_slow_irq_15_handler,
252 atari_slow_irq_16_handler,
253 atari_slow_irq_17_handler,
254 atari_slow_irq_18_handler,
255 atari_slow_irq_19_handler,
256 atari_slow_irq_20_handler,
257 atari_slow_irq_21_handler,
258 atari_slow_irq_22_handler,
259 atari_slow_irq_23_handler,
260 atari_slow_irq_24_handler,
261 atari_slow_irq_25_handler,
262 atari_slow_irq_26_handler,
263 atari_slow_irq_27_handler,
264 atari_slow_irq_28_handler,
265 atari_slow_irq_29_handler,
266 atari_slow_irq_30_handler,
267 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. */
atari_fast_prio_irq_dummy(void)274 void atari_fast_prio_irq_dummy (void) {
275 __asm__ (__ALIGN_STR "\n"
276 SYMBOL_NAME_STR(atari_fast_irq_handler) ":
277 orw #0x700,%%sr /* disable all interrupts */
278 "SYMBOL_NAME_STR(atari_prio_irq_handler) ":\t
279 addql #1,%2\n" /* local_irq_count++ */
280 SAVE_ALL_INT "\n"
281 GET_CURRENT(%%d0) "
282 /* get vector number from stack frame and convert to source */
283 bfextu %%sp@(%c1){#4,#10},%%d0
284 subw #(0x40-8),%%d0
285 jpl 1f
286 addw #(0x40-8-0x18),%%d0
287 1: lea %a0,%%a0
288 addql #1,%%a0@(%%d0:l:4)
289 lea "SYMBOL_NAME_STR(irq_handler)",%%a0
290 lea %%a0@(%%d0:l:8),%%a0
291 pea %%sp@ /* push frame address */
292 movel %%a0@(4),%%sp@- /* push handler data */
293 movel %%d0,%%sp@- /* push int number */
294 movel %%a0@,%%a0
295 jsr %%a0@ /* and call the handler */
296 addql #8,%%sp
297 addql #4,%%sp
298 jbra "SYMBOL_NAME_STR(ret_from_interrupt)
299 : : "i" (&kstat.irqs[0]), "n" (PT_OFF_FORMATVEC),
300 "m" (local_irq_count(0))
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"
312 SYMBOL_NAME_STR(falcon_hblhandler) ":
313 orw #0x200,%sp@ /* 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
atari_init_IRQ(void)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
atari_call_irq_list(int irq,void * dev_id,struct pt_regs * fp)407 static void 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 }
414
415
416 /*
417 * atari_request_irq : add an interrupt service routine for a particular
418 * machine specific interrupt source.
419 * If the addition was successful, it returns 0.
420 */
421
atari_request_irq(unsigned int irq,void (* handler)(int,void *,struct pt_regs *),unsigned long flags,const char * devname,void * dev_id)422 int atari_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
423 unsigned long flags, const char *devname, void *dev_id)
424 {
425 int vector;
426 unsigned long oflags = flags;
427
428 /*
429 * The following is a hack to make some PCI card drivers work,
430 * which set the SA_SHIRQ flag.
431 */
432
433 flags &= ~SA_SHIRQ;
434
435 if (flags == SA_INTERRUPT) {
436 printk ("%s: SA_INTERRUPT changed to IRQ_TYPE_SLOW for %s\n",
437 __FUNCTION__, devname);
438 flags = IRQ_TYPE_SLOW;
439 }
440 if (flags < IRQ_TYPE_SLOW || flags > IRQ_TYPE_PRIO) {
441 printk ("%s: Bad irq type 0x%lx <0x%lx> requested from %s\n",
442 __FUNCTION__, flags, oflags, devname);
443 return -EINVAL;
444 }
445 if (!IS_VALID_INTNO(irq)) {
446 printk ("%s: Unknown irq %d requested from %s\n",
447 __FUNCTION__, irq, devname);
448 return -ENXIO;
449 }
450 vector = IRQ_SOURCE_TO_VECTOR(irq);
451
452 /*
453 * Check type/source combination: slow ints are (currently)
454 * only possible for MFP-interrupts.
455 */
456 if (flags == IRQ_TYPE_SLOW &&
457 (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE)) {
458 printk ("%s: Slow irq requested for non-MFP source %d from %s\n",
459 __FUNCTION__, irq, devname);
460 return -EINVAL;
461 }
462
463 if (vectors[vector] == bad_interrupt) {
464 /* int has no handler yet */
465 irq_handler[irq].handler = handler;
466 irq_handler[irq].dev_id = dev_id;
467 irq_param[irq].flags = flags;
468 irq_param[irq].devname = devname;
469 vectors[vector] =
470 (flags == IRQ_TYPE_SLOW) ? slow_handlers[irq-STMFP_SOURCE_BASE] :
471 (flags == IRQ_TYPE_FAST) ? atari_fast_irq_handler :
472 atari_prio_irq_handler;
473 /* If MFP int, also enable and umask it */
474 atari_turnon_irq(irq);
475 atari_enable_irq(irq);
476
477 return 0;
478 }
479 else if (irq_param[irq].flags == flags) {
480 /* old handler is of same type -> handlers can be chained */
481 irq_node_t *node;
482 unsigned long flags;
483
484 save_flags(flags);
485 cli();
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 restore_flags(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
atari_free_irq(unsigned int irq,void * dev_id)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 save_flags(flags);
535 cli();
536
537 if (irq_handler[irq].handler != atari_call_irq_list) {
538 /* It's the only handler for the interrupt */
539 if (irq_handler[irq].dev_id != dev_id) {
540 restore_flags(flags);
541 goto not_found;
542 }
543 irq_handler[irq].handler = NULL;
544 irq_handler[irq].dev_id = NULL;
545 irq_param[irq].devname = NULL;
546 vectors[vector] = bad_interrupt;
547 /* If MFP int, also disable it */
548 atari_disable_irq(irq);
549 atari_turnoff_irq(irq);
550
551 restore_flags(flags);
552 return;
553 }
554
555 /* The interrupt is chained, find the irq on the list */
556 for(list = (irq_node_t **)&irq_handler[irq].dev_id; *list; list = &(*list)->next) {
557 if ((*list)->dev_id == dev_id) break;
558 }
559 if (!*list) {
560 restore_flags(flags);
561 goto not_found;
562 }
563
564 (*list)->handler = NULL; /* Mark it as free for reallocation */
565 *list = (*list)->next;
566
567 /* If there's now only one handler, unchain the interrupt, i.e. plug in
568 * the handler directly again and omit atari_call_irq_list */
569 node = (irq_node_t *)irq_handler[irq].dev_id;
570 if (node && !node->next) {
571 irq_handler[irq].handler = node->handler;
572 irq_handler[irq].dev_id = node->dev_id;
573 irq_param[irq].devname = node->devname;
574 node->handler = NULL; /* Mark it as free for reallocation */
575 }
576
577 restore_flags(flags);
578 return;
579
580 not_found:
581 printk("%s: tried to remove invalid irq\n", __FUNCTION__);
582 return;
583 }
584
585
586 /*
587 * atari_register_vme_int() returns the number of a free interrupt vector for
588 * hardware with a programmable int vector (probably a VME board).
589 */
590
atari_register_vme_int(void)591 unsigned long atari_register_vme_int(void)
592 {
593 int i;
594
595 for(i = 0; i < 32; i++)
596 if((free_vme_vec_bitmap & (1 << i)) == 0)
597 break;
598
599 if(i == 16)
600 return 0;
601
602 free_vme_vec_bitmap |= 1 << i;
603 return (VME_SOURCE_BASE + i);
604 }
605
606
atari_unregister_vme_int(unsigned long irq)607 void atari_unregister_vme_int(unsigned long irq)
608 {
609 if(irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) {
610 irq -= VME_SOURCE_BASE;
611 free_vme_vec_bitmap &= ~(1 << irq);
612 }
613 }
614
615
atari_get_irq_list(char * buf)616 int atari_get_irq_list(char *buf)
617 {
618 int i, len = 0;
619
620 for (i = 0; i < NUM_INT_SOURCES; ++i) {
621 if (vectors[IRQ_SOURCE_TO_VECTOR(i)] == bad_interrupt)
622 continue;
623 if (i < STMFP_SOURCE_BASE)
624 len += sprintf(buf+len, "auto %2d: %10u ",
625 i, kstat.irqs[0][i]);
626 else
627 len += sprintf(buf+len, "vec $%02x: %10u ",
628 IRQ_SOURCE_TO_VECTOR(i),
629 kstat.irqs[0][i]);
630
631 if (irq_handler[i].handler != atari_call_irq_list) {
632 len += sprintf(buf+len, "%s\n", irq_param[i].devname);
633 }
634 else {
635 irq_node_t *p;
636 for( p = (irq_node_t *)irq_handler[i].dev_id; p; p = p->next ) {
637 len += sprintf(buf+len, "%s\n", p->devname);
638 if (p->next)
639 len += sprintf( buf+len, " " );
640 }
641 }
642 }
643 if (num_spurious)
644 len += sprintf(buf+len, "spurio.: %10u\n", num_spurious);
645
646 return len;
647 }
648
649
650