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1/*
2 * linux/arch/m68k/amiga/amiints.c -- Amiga Linux interrupt handling code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file COPYING in the main directory of this archive
6 * for more details.
7 *
8 * 11/07/96: rewritten interrupt handling, irq lists are exists now only for
9 * this sources where it makes sense (VERTB/PORTS/EXTER) and you must
10 * be careful that dev_id for this sources is unique since this the
11 * only possibility to distinguish between different handlers for
12 * free_irq. irq lists also have different irq flags:
13 * - IRQ_FLG_FAST: handler is inserted at top of list (after other
14 * fast handlers)
15 * - IRQ_FLG_SLOW: handler is inserted at bottom of list and before
16 * they're executed irq level is set to the previous
17 * one, but handlers don't need to be reentrant, if
18 * reentrance occurred, slow handlers will be just
19 * called again.
20 * The whole interrupt handling for CIAs is moved to cia.c
21 * /Roman Zippel
22 *
23 * 07/08/99: rewamp of the interrupt handling - we now have two types of
24 * interrupts, normal and fast handlers, fast handlers being
25 * marked with SA_INTERRUPT and runs with all other interrupts
26 * disabled. Normal interrupts disable their own source but
27 * run with all other interrupt sources enabled.
28 * PORTS and EXTER interrupts are always shared even if the
29 * drivers do not explicitly mark this when calling
30 * request_irq which they really should do.
31 * This is similar to the way interrupts are handled on all
32 * other architectures and makes a ton of sense besides
33 * having the advantage of making it easier to share
34 * drivers.
35 * /Jes
36 */
37
38#include <linux/types.h>
39#include <linux/kernel.h>
40#include <linux/sched.h>
41#include <linux/kernel_stat.h>
42#include <linux/init.h>
43#include <linux/errno.h>
44#include <linux/seq_file.h>
45
46#include <asm/system.h>
47#include <asm/irq.h>
48#include <asm/traps.h>
49#include <asm/amigahw.h>
50#include <asm/amigaints.h>
51#include <asm/amipcmcia.h>
52
53extern int cia_request_irq(struct ciabase *base,int irq,
54 irqreturn_t (*handler)(int, void *, struct pt_regs *),
55 unsigned long flags, const char *devname, void *dev_id);
56extern void cia_free_irq(struct ciabase *base, unsigned int irq, void *dev_id);
57extern void cia_init_IRQ(struct ciabase *base);
58extern int cia_get_irq_list(struct ciabase *base, struct seq_file *p);
59
60/* irq node variables for amiga interrupt sources */
61static irq_node_t *ami_irq_list[AMI_STD_IRQS];
62
63static unsigned short amiga_intena_vals[AMI_STD_IRQS] = {
64 [IRQ_AMIGA_VERTB] = IF_VERTB,
65 [IRQ_AMIGA_COPPER] = IF_COPER,
66 [IRQ_AMIGA_AUD0] = IF_AUD0,
67 [IRQ_AMIGA_AUD1] = IF_AUD1,
68 [IRQ_AMIGA_AUD2] = IF_AUD2,
69 [IRQ_AMIGA_AUD3] = IF_AUD3,
70 [IRQ_AMIGA_BLIT] = IF_BLIT,
71 [IRQ_AMIGA_DSKSYN] = IF_DSKSYN,
72 [IRQ_AMIGA_DSKBLK] = IF_DSKBLK,
73 [IRQ_AMIGA_RBF] = IF_RBF,
74 [IRQ_AMIGA_TBE] = IF_TBE,
75 [IRQ_AMIGA_SOFT] = IF_SOFT,
76 [IRQ_AMIGA_PORTS] = IF_PORTS,
77 [IRQ_AMIGA_EXTER] = IF_EXTER
78};
79static const unsigned char ami_servers[AMI_STD_IRQS] = {
80 [IRQ_AMIGA_VERTB] = 1,
81 [IRQ_AMIGA_PORTS] = 1,
82 [IRQ_AMIGA_EXTER] = 1
83};
84
85static short ami_ablecount[AMI_IRQS];
86
87static irqreturn_t ami_badint(int irq, void *dev_id, struct pt_regs *fp)
88{
89 num_spurious += 1;
90 return IRQ_NONE;
91}
92
93/*
94 * void amiga_init_IRQ(void)
95 *
96 * Parameters: None
97 *
98 * Returns: Nothing
99 *
100 * This function should be called during kernel startup to initialize
101 * the amiga IRQ handling routines.
102 */
103
104void __init amiga_init_IRQ(void)
105{
106 int i;
107
108 /* initialize handlers */
109 for (i = 0; i < AMI_STD_IRQS; i++) {
110 if (ami_servers[i]) {
111 ami_irq_list[i] = NULL;
112 } else {
113 ami_irq_list[i] = new_irq_node();
114 ami_irq_list[i]->handler = ami_badint;
115 ami_irq_list[i]->flags = 0;
116 ami_irq_list[i]->dev_id = NULL;
117 ami_irq_list[i]->devname = NULL;
118 ami_irq_list[i]->next = NULL;
119 }
120 }
121 for (i = 0; i < AMI_IRQS; i++)
122 ami_ablecount[i] = 0;
123
124 /* turn off PCMCIA interrupts */
125 if (AMIGAHW_PRESENT(PCMCIA))
126 gayle.inten = GAYLE_IRQ_IDE;
127
128 /* turn off all interrupts and enable the master interrupt bit */
129 custom.intena = 0x7fff;
130 custom.intreq = 0x7fff;
131 custom.intena = IF_SETCLR | IF_INTEN;
132
133 cia_init_IRQ(&ciaa_base);
134 cia_init_IRQ(&ciab_base);
135}
136
137static inline int amiga_insert_irq(irq_node_t **list, irq_node_t *node)
138{
139 unsigned long flags;
140 irq_node_t *cur;
141
142 if (!node->dev_id)
143 printk("%s: Warning: dev_id of %s is zero\n",
144 __FUNCTION__, node->devname);
145
146 local_irq_save(flags);
147
148 cur = *list;
149
150 if (node->flags & SA_INTERRUPT) {
151 if (node->flags & SA_SHIRQ)
152 return -EBUSY;
153 /*
154 * There should never be more than one
155 */
156 while (cur && cur->flags & SA_INTERRUPT) {
157 list = &cur->next;
158 cur = cur->next;
159 }
160 } else {
161 while (cur) {
162 list = &cur->next;
163 cur = cur->next;
164 }
165 }
166
167 node->next = cur;
168 *list = node;
169
170 local_irq_restore(flags);
171 return 0;
172}
173
174static inline void amiga_delete_irq(irq_node_t **list, void *dev_id)
175{
176 unsigned long flags;
177 irq_node_t *node;
178
179 local_irq_save(flags);
180
181 for (node = *list; node; list = &node->next, node = *list) {
182 if (node->dev_id == dev_id) {
183 *list = node->next;
184 /* Mark it as free. */
185 node->handler = NULL;
186 local_irq_restore(flags);
187 return;
188 }
189 }
190 local_irq_restore(flags);
191 printk ("%s: tried to remove invalid irq\n", __FUNCTION__);
192}
193
194/*
195 * amiga_request_irq : add an interrupt service routine for a particular
196 * machine specific interrupt source.
197 * If the addition was successful, it returns 0.
198 */
199
200int amiga_request_irq(unsigned int irq,
201 irqreturn_t (*handler)(int, void *, struct pt_regs *),
202 unsigned long flags, const char *devname, void *dev_id)
203{
204 irq_node_t *node;
205 int error = 0;
206
207 if (irq >= AMI_IRQS) {
208 printk ("%s: Unknown IRQ %d from %s\n", __FUNCTION__,
209 irq, devname);
210 return -ENXIO;
211 }
212
213 if (irq >= IRQ_AMIGA_AUTO)
214 return cpu_request_irq(irq - IRQ_AMIGA_AUTO, handler,
215 flags, devname, dev_id);
216
217 if (irq >= IRQ_AMIGA_CIAB)
218 return cia_request_irq(&ciab_base, irq - IRQ_AMIGA_CIAB,
219 handler, flags, devname, dev_id);
220
221 if (irq >= IRQ_AMIGA_CIAA)
222 return cia_request_irq(&ciaa_base, irq - IRQ_AMIGA_CIAA,
223 handler, flags, devname, dev_id);
224
225 /*
226 * IRQ_AMIGA_PORTS & IRQ_AMIGA_EXTER defaults to shared,
227 * we could add a check here for the SA_SHIRQ flag but all drivers
228 * should be aware of sharing anyway.
229 */
230 if (ami_servers[irq]) {
231 if (!(node = new_irq_node()))
232 return -ENOMEM;
233 node->handler = handler;
234 node->flags = flags;
235 node->dev_id = dev_id;
236 node->devname = devname;
237 node->next = NULL;
238 error = amiga_insert_irq(&ami_irq_list[irq], node);
239 } else {
240 ami_irq_list[irq]->handler = handler;
241 ami_irq_list[irq]->flags = flags;
242 ami_irq_list[irq]->dev_id = dev_id;
243 ami_irq_list[irq]->devname = devname;
244 }
245
246 /* enable the interrupt */
247 if (irq < IRQ_AMIGA_PORTS && !ami_ablecount[irq])
248 custom.intena = IF_SETCLR | amiga_intena_vals[irq];
249
250 return error;
251}
252
253void amiga_free_irq(unsigned int irq, void *dev_id)
254{
255 if (irq >= AMI_IRQS) {
256 printk ("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
257 return;
258 }
259
260 if (irq >= IRQ_AMIGA_AUTO)
261 cpu_free_irq(irq - IRQ_AMIGA_AUTO, dev_id);
262
263 if (irq >= IRQ_AMIGA_CIAB) {
264 cia_free_irq(&ciab_base, irq - IRQ_AMIGA_CIAB, dev_id);
265 return;
266 }
267
268 if (irq >= IRQ_AMIGA_CIAA) {
269 cia_free_irq(&ciaa_base, irq - IRQ_AMIGA_CIAA, dev_id);
270 return;
271 }
272
273 if (ami_servers[irq]) {
274 amiga_delete_irq(&ami_irq_list[irq], dev_id);
275 /* if server list empty, disable the interrupt */
276 if (!ami_irq_list[irq] && irq < IRQ_AMIGA_PORTS)
277 custom.intena = amiga_intena_vals[irq];
278 } else {
279 if (ami_irq_list[irq]->dev_id != dev_id)
280 printk("%s: removing probably wrong IRQ %d from %s\n",
281 __FUNCTION__, irq, ami_irq_list[irq]->devname);
282 ami_irq_list[irq]->handler = ami_badint;
283 ami_irq_list[irq]->flags = 0;
284 ami_irq_list[irq]->dev_id = NULL;
285 ami_irq_list[irq]->devname = NULL;
286 custom.intena = amiga_intena_vals[irq];
287 }
288}
289
290/*
291 * Enable/disable a particular machine specific interrupt source.
292 * Note that this may affect other interrupts in case of a shared interrupt.
293 * This function should only be called for a _very_ short time to change some
294 * internal data, that may not be changed by the interrupt at the same time.
295 * ami_(enable|disable)_irq calls may also be nested.
296 */
297
298void amiga_enable_irq(unsigned int irq)
299{
300 if (irq >= AMI_IRQS) {
301 printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
302 return;
303 }
304
305 if (--ami_ablecount[irq])
306 return;
307
308 /* No action for auto-vector interrupts */
309 if (irq >= IRQ_AMIGA_AUTO){
310 printk("%s: Trying to enable auto-vector IRQ %i\n",
311 __FUNCTION__, irq - IRQ_AMIGA_AUTO);
312 return;
313 }
314
315 if (irq >= IRQ_AMIGA_CIAB) {
316 cia_set_irq(&ciab_base, (1 << (irq - IRQ_AMIGA_CIAB)));
317 cia_able_irq(&ciab_base, CIA_ICR_SETCLR |
318 (1 << (irq - IRQ_AMIGA_CIAB)));
319 return;
320 }
321
322 if (irq >= IRQ_AMIGA_CIAA) {
323 cia_set_irq(&ciaa_base, (1 << (irq - IRQ_AMIGA_CIAA)));
324 cia_able_irq(&ciaa_base, CIA_ICR_SETCLR |
325 (1 << (irq - IRQ_AMIGA_CIAA)));
326 return;
327 }
328
329 /* enable the interrupt */
330 custom.intena = IF_SETCLR | amiga_intena_vals[irq];
331}
332
333void amiga_disable_irq(unsigned int irq)
334{
335 if (irq >= AMI_IRQS) {
336 printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
337 return;
338 }
339
340 if (ami_ablecount[irq]++)
341 return;
342
343 /* No action for auto-vector interrupts */
344 if (irq >= IRQ_AMIGA_AUTO) {
345 printk("%s: Trying to disable auto-vector IRQ %i\n",
346 __FUNCTION__, irq - IRQ_AMIGA_AUTO);
347 return;
348 }
349
350 if (irq >= IRQ_AMIGA_CIAB) {
351 cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
352 return;
353 }
354
355 if (irq >= IRQ_AMIGA_CIAA) {
356 cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
357 return;
358 }
359
360 /* disable the interrupt */
361 custom.intena = amiga_intena_vals[irq];
362}
363
364inline void amiga_do_irq(int irq, struct pt_regs *fp)
365{
366 kstat_cpu(0).irqs[SYS_IRQS + irq]++;
367 ami_irq_list[irq]->handler(irq, ami_irq_list[irq]->dev_id, fp);
368}
369
370void amiga_do_irq_list(int irq, struct pt_regs *fp)
371{
372 irq_node_t *node;
373
374 kstat_cpu(0).irqs[SYS_IRQS + irq]++;
375
376 custom.intreq = amiga_intena_vals[irq];
377
378 for (node = ami_irq_list[irq]; node; node = node->next)
379 node->handler(irq, node->dev_id, fp);
380}
381
382/*
383 * The builtin Amiga hardware interrupt handlers.
384 */
385
386static irqreturn_t ami_int1(int irq, void *dev_id, struct pt_regs *fp)
387{
388 unsigned short ints = custom.intreqr & custom.intenar;
389
390 /* if serial transmit buffer empty, interrupt */
391 if (ints & IF_TBE) {
392 custom.intreq = IF_TBE;
393 amiga_do_irq(IRQ_AMIGA_TBE, fp);
394 }
395
396 /* if floppy disk transfer complete, interrupt */
397 if (ints & IF_DSKBLK) {
398 custom.intreq = IF_DSKBLK;
399 amiga_do_irq(IRQ_AMIGA_DSKBLK, fp);
400 }
401
402 /* if software interrupt set, interrupt */
403 if (ints & IF_SOFT) {
404 custom.intreq = IF_SOFT;
405 amiga_do_irq(IRQ_AMIGA_SOFT, fp);
406 }
407 return IRQ_HANDLED;
408}
409
410static irqreturn_t ami_int3(int irq, void *dev_id, struct pt_regs *fp)
411{
412 unsigned short ints = custom.intreqr & custom.intenar;
413
414 /* if a blitter interrupt */
415 if (ints & IF_BLIT) {
416 custom.intreq = IF_BLIT;
417 amiga_do_irq(IRQ_AMIGA_BLIT, fp);
418 }
419
420 /* if a copper interrupt */
421 if (ints & IF_COPER) {
422 custom.intreq = IF_COPER;
423 amiga_do_irq(IRQ_AMIGA_COPPER, fp);
424 }
425
426 /* if a vertical blank interrupt */
427 if (ints & IF_VERTB)
428 amiga_do_irq_list(IRQ_AMIGA_VERTB, fp);
429 return IRQ_HANDLED;
430}
431
432static irqreturn_t ami_int4(int irq, void *dev_id, struct pt_regs *fp)
433{
434 unsigned short ints = custom.intreqr & custom.intenar;
435
436 /* if audio 0 interrupt */
437 if (ints & IF_AUD0) {
438 custom.intreq = IF_AUD0;
439 amiga_do_irq(IRQ_AMIGA_AUD0, fp);
440 }
441
442 /* if audio 1 interrupt */
443 if (ints & IF_AUD1) {
444 custom.intreq = IF_AUD1;
445 amiga_do_irq(IRQ_AMIGA_AUD1, fp);
446 }
447
448 /* if audio 2 interrupt */
449 if (ints & IF_AUD2) {
450 custom.intreq = IF_AUD2;
451 amiga_do_irq(IRQ_AMIGA_AUD2, fp);
452 }
453
454 /* if audio 3 interrupt */
455 if (ints & IF_AUD3) {
456 custom.intreq = IF_AUD3;
457 amiga_do_irq(IRQ_AMIGA_AUD3, fp);
458 }
459 return IRQ_HANDLED;
460}
461
462static irqreturn_t ami_int5(int irq, void *dev_id, struct pt_regs *fp)
463{
464 unsigned short ints = custom.intreqr & custom.intenar;
465
466 /* if serial receive buffer full interrupt */
467 if (ints & IF_RBF) {
468 /* acknowledge of IF_RBF must be done by the serial interrupt */
469 amiga_do_irq(IRQ_AMIGA_RBF, fp);
470 }
471
472 /* if a disk sync interrupt */
473 if (ints & IF_DSKSYN) {
474 custom.intreq = IF_DSKSYN;
475 amiga_do_irq(IRQ_AMIGA_DSKSYN, fp);
476 }
477 return IRQ_HANDLED;
478}
479
480static irqreturn_t ami_int7(int irq, void *dev_id, struct pt_regs *fp)
481{
482 panic ("level 7 interrupt received\n");
483}
484
485irqreturn_t (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
486 [0] = ami_badint,
487 [1] = ami_int1,
488 [2] = ami_badint,
489 [3] = ami_int3,
490 [4] = ami_int4,
491 [5] = ami_int5,
492 [6] = ami_badint,
493 [7] = ami_int7
494};
495
496int show_amiga_interrupts(struct seq_file *p, void *v)
497{
498 int i;
499 irq_node_t *node;
500
501 for (i = 0; i < AMI_STD_IRQS; i++) {
502 if (!(node = ami_irq_list[i]))
503 continue;
504 seq_printf(p, "ami %2d: %10u ", i,
505 kstat_cpu(0).irqs[SYS_IRQS + i]);
506 do {
507 if (node->flags & SA_INTERRUPT)
508 seq_puts(p, "F ");
509 else
510 seq_puts(p, " ");
511 seq_printf(p, "%s\n", node->devname);
512 if ((node = node->next))
513 seq_puts(p, " ");
514 } while (node);
515 }
516
517 cia_get_irq_list(&ciaa_base, p);
518 cia_get_irq_list(&ciab_base, p);
519 return 0;
520}