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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68k/atari/ataints.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/m68k/atari/ataints.c')
-rw-r--r--arch/m68k/atari/ataints.c648
1 files changed, 648 insertions, 0 deletions
diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c
new file mode 100644
index 000000000000..076f47917842
--- /dev/null
+++ b/arch/m68k/atari/ataints.c
@@ -0,0 +1,648 @@
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
110typedef void (*asm_irq_handler)(void);
111
112struct irqhandler {
113 irqreturn_t (*handler)(int, void *, struct pt_regs *);
114 void *dev_id;
115};
116
117struct 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 */
127static 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 */
134static 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 */
141static 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) \
166asmlinkage void IRQ_NAME(n); \
167/* Dummy function to allow asm with operands. */ \
168void 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
202BUILD_SLOW_IRQ(0);
203BUILD_SLOW_IRQ(1);
204BUILD_SLOW_IRQ(2);
205BUILD_SLOW_IRQ(3);
206BUILD_SLOW_IRQ(4);
207BUILD_SLOW_IRQ(5);
208BUILD_SLOW_IRQ(6);
209BUILD_SLOW_IRQ(7);
210BUILD_SLOW_IRQ(8);
211BUILD_SLOW_IRQ(9);
212BUILD_SLOW_IRQ(10);
213BUILD_SLOW_IRQ(11);
214BUILD_SLOW_IRQ(12);
215BUILD_SLOW_IRQ(13);
216BUILD_SLOW_IRQ(14);
217BUILD_SLOW_IRQ(15);
218BUILD_SLOW_IRQ(16);
219BUILD_SLOW_IRQ(17);
220BUILD_SLOW_IRQ(18);
221BUILD_SLOW_IRQ(19);
222BUILD_SLOW_IRQ(20);
223BUILD_SLOW_IRQ(21);
224BUILD_SLOW_IRQ(22);
225BUILD_SLOW_IRQ(23);
226BUILD_SLOW_IRQ(24);
227BUILD_SLOW_IRQ(25);
228BUILD_SLOW_IRQ(26);
229BUILD_SLOW_IRQ(27);
230BUILD_SLOW_IRQ(28);
231BUILD_SLOW_IRQ(29);
232BUILD_SLOW_IRQ(30);
233BUILD_SLOW_IRQ(31);
234
235asm_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
270asmlinkage void atari_fast_irq_handler( void );
271asmlinkage void atari_prio_irq_handler( void );
272
273/* Dummy function to allow asm with operands. */
274void 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 */
309asmlinkage void falcon_hblhandler(void);
310asm(".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' */
317asmlinkage void bad_interrupt(void);
318
319extern void atari_microwire_cmd( int cmd );
320
321extern 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
334void __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
407static 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
423int 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
519void 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
579not_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
590unsigned 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
606void 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
615int 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