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Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6
[deliverable/linux.git] / arch / powerpc / sysdev / ipic.c
1 /*
2 * arch/powerpc/sysdev/ipic.c
3 *
4 * IPIC routines implementations.
5 *
6 * Copyright 2005 Freescale Semiconductor, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/errno.h>
16 #include <linux/reboot.h>
17 #include <linux/slab.h>
18 #include <linux/stddef.h>
19 #include <linux/sched.h>
20 #include <linux/signal.h>
21 #include <linux/sysdev.h>
22 #include <linux/device.h>
23 #include <linux/bootmem.h>
24 #include <linux/spinlock.h>
25 #include <asm/irq.h>
26 #include <asm/io.h>
27 #include <asm/prom.h>
28 #include <asm/ipic.h>
29
30 #include "ipic.h"
31
32 static struct ipic * primary_ipic;
33 static DEFINE_SPINLOCK(ipic_lock);
34
35 static struct ipic_info ipic_info[] = {
36 [9] = {
37 .pend = IPIC_SIPNR_H,
38 .mask = IPIC_SIMSR_H,
39 .prio = IPIC_SIPRR_D,
40 .force = IPIC_SIFCR_H,
41 .bit = 24,
42 .prio_mask = 0,
43 },
44 [10] = {
45 .pend = IPIC_SIPNR_H,
46 .mask = IPIC_SIMSR_H,
47 .prio = IPIC_SIPRR_D,
48 .force = IPIC_SIFCR_H,
49 .bit = 25,
50 .prio_mask = 1,
51 },
52 [11] = {
53 .pend = IPIC_SIPNR_H,
54 .mask = IPIC_SIMSR_H,
55 .prio = IPIC_SIPRR_D,
56 .force = IPIC_SIFCR_H,
57 .bit = 26,
58 .prio_mask = 2,
59 },
60 [14] = {
61 .pend = IPIC_SIPNR_H,
62 .mask = IPIC_SIMSR_H,
63 .prio = IPIC_SIPRR_D,
64 .force = IPIC_SIFCR_H,
65 .bit = 29,
66 .prio_mask = 5,
67 },
68 [15] = {
69 .pend = IPIC_SIPNR_H,
70 .mask = IPIC_SIMSR_H,
71 .prio = IPIC_SIPRR_D,
72 .force = IPIC_SIFCR_H,
73 .bit = 30,
74 .prio_mask = 6,
75 },
76 [16] = {
77 .pend = IPIC_SIPNR_H,
78 .mask = IPIC_SIMSR_H,
79 .prio = IPIC_SIPRR_D,
80 .force = IPIC_SIFCR_H,
81 .bit = 31,
82 .prio_mask = 7,
83 },
84 [17] = {
85 .pend = IPIC_SEPNR,
86 .mask = IPIC_SEMSR,
87 .prio = IPIC_SMPRR_A,
88 .force = IPIC_SEFCR,
89 .bit = 1,
90 .prio_mask = 5,
91 },
92 [18] = {
93 .pend = IPIC_SEPNR,
94 .mask = IPIC_SEMSR,
95 .prio = IPIC_SMPRR_A,
96 .force = IPIC_SEFCR,
97 .bit = 2,
98 .prio_mask = 6,
99 },
100 [19] = {
101 .pend = IPIC_SEPNR,
102 .mask = IPIC_SEMSR,
103 .prio = IPIC_SMPRR_A,
104 .force = IPIC_SEFCR,
105 .bit = 3,
106 .prio_mask = 7,
107 },
108 [20] = {
109 .pend = IPIC_SEPNR,
110 .mask = IPIC_SEMSR,
111 .prio = IPIC_SMPRR_B,
112 .force = IPIC_SEFCR,
113 .bit = 4,
114 .prio_mask = 4,
115 },
116 [21] = {
117 .pend = IPIC_SEPNR,
118 .mask = IPIC_SEMSR,
119 .prio = IPIC_SMPRR_B,
120 .force = IPIC_SEFCR,
121 .bit = 5,
122 .prio_mask = 5,
123 },
124 [22] = {
125 .pend = IPIC_SEPNR,
126 .mask = IPIC_SEMSR,
127 .prio = IPIC_SMPRR_B,
128 .force = IPIC_SEFCR,
129 .bit = 6,
130 .prio_mask = 6,
131 },
132 [23] = {
133 .pend = IPIC_SEPNR,
134 .mask = IPIC_SEMSR,
135 .prio = IPIC_SMPRR_B,
136 .force = IPIC_SEFCR,
137 .bit = 7,
138 .prio_mask = 7,
139 },
140 [32] = {
141 .pend = IPIC_SIPNR_H,
142 .mask = IPIC_SIMSR_H,
143 .prio = IPIC_SIPRR_A,
144 .force = IPIC_SIFCR_H,
145 .bit = 0,
146 .prio_mask = 0,
147 },
148 [33] = {
149 .pend = IPIC_SIPNR_H,
150 .mask = IPIC_SIMSR_H,
151 .prio = IPIC_SIPRR_A,
152 .force = IPIC_SIFCR_H,
153 .bit = 1,
154 .prio_mask = 1,
155 },
156 [34] = {
157 .pend = IPIC_SIPNR_H,
158 .mask = IPIC_SIMSR_H,
159 .prio = IPIC_SIPRR_A,
160 .force = IPIC_SIFCR_H,
161 .bit = 2,
162 .prio_mask = 2,
163 },
164 [35] = {
165 .pend = IPIC_SIPNR_H,
166 .mask = IPIC_SIMSR_H,
167 .prio = IPIC_SIPRR_A,
168 .force = IPIC_SIFCR_H,
169 .bit = 3,
170 .prio_mask = 3,
171 },
172 [36] = {
173 .pend = IPIC_SIPNR_H,
174 .mask = IPIC_SIMSR_H,
175 .prio = IPIC_SIPRR_A,
176 .force = IPIC_SIFCR_H,
177 .bit = 4,
178 .prio_mask = 4,
179 },
180 [37] = {
181 .pend = IPIC_SIPNR_H,
182 .mask = IPIC_SIMSR_H,
183 .prio = IPIC_SIPRR_A,
184 .force = IPIC_SIFCR_H,
185 .bit = 5,
186 .prio_mask = 5,
187 },
188 [38] = {
189 .pend = IPIC_SIPNR_H,
190 .mask = IPIC_SIMSR_H,
191 .prio = IPIC_SIPRR_A,
192 .force = IPIC_SIFCR_H,
193 .bit = 6,
194 .prio_mask = 6,
195 },
196 [39] = {
197 .pend = IPIC_SIPNR_H,
198 .mask = IPIC_SIMSR_H,
199 .prio = IPIC_SIPRR_A,
200 .force = IPIC_SIFCR_H,
201 .bit = 7,
202 .prio_mask = 7,
203 },
204 [48] = {
205 .pend = IPIC_SEPNR,
206 .mask = IPIC_SEMSR,
207 .prio = IPIC_SMPRR_A,
208 .force = IPIC_SEFCR,
209 .bit = 0,
210 .prio_mask = 4,
211 },
212 [64] = {
213 .pend = IPIC_SIPNR_L,
214 .mask = IPIC_SIMSR_L,
215 .prio = IPIC_SMPRR_A,
216 .force = IPIC_SIFCR_L,
217 .bit = 0,
218 .prio_mask = 0,
219 },
220 [65] = {
221 .pend = IPIC_SIPNR_L,
222 .mask = IPIC_SIMSR_L,
223 .prio = IPIC_SMPRR_A,
224 .force = IPIC_SIFCR_L,
225 .bit = 1,
226 .prio_mask = 1,
227 },
228 [66] = {
229 .pend = IPIC_SIPNR_L,
230 .mask = IPIC_SIMSR_L,
231 .prio = IPIC_SMPRR_A,
232 .force = IPIC_SIFCR_L,
233 .bit = 2,
234 .prio_mask = 2,
235 },
236 [67] = {
237 .pend = IPIC_SIPNR_L,
238 .mask = IPIC_SIMSR_L,
239 .prio = IPIC_SMPRR_A,
240 .force = IPIC_SIFCR_L,
241 .bit = 3,
242 .prio_mask = 3,
243 },
244 [68] = {
245 .pend = IPIC_SIPNR_L,
246 .mask = IPIC_SIMSR_L,
247 .prio = IPIC_SMPRR_B,
248 .force = IPIC_SIFCR_L,
249 .bit = 4,
250 .prio_mask = 0,
251 },
252 [69] = {
253 .pend = IPIC_SIPNR_L,
254 .mask = IPIC_SIMSR_L,
255 .prio = IPIC_SMPRR_B,
256 .force = IPIC_SIFCR_L,
257 .bit = 5,
258 .prio_mask = 1,
259 },
260 [70] = {
261 .pend = IPIC_SIPNR_L,
262 .mask = IPIC_SIMSR_L,
263 .prio = IPIC_SMPRR_B,
264 .force = IPIC_SIFCR_L,
265 .bit = 6,
266 .prio_mask = 2,
267 },
268 [71] = {
269 .pend = IPIC_SIPNR_L,
270 .mask = IPIC_SIMSR_L,
271 .prio = IPIC_SMPRR_B,
272 .force = IPIC_SIFCR_L,
273 .bit = 7,
274 .prio_mask = 3,
275 },
276 [72] = {
277 .pend = IPIC_SIPNR_L,
278 .mask = IPIC_SIMSR_L,
279 .prio = 0,
280 .force = IPIC_SIFCR_L,
281 .bit = 8,
282 },
283 [73] = {
284 .pend = IPIC_SIPNR_L,
285 .mask = IPIC_SIMSR_L,
286 .prio = 0,
287 .force = IPIC_SIFCR_L,
288 .bit = 9,
289 },
290 [74] = {
291 .pend = IPIC_SIPNR_L,
292 .mask = IPIC_SIMSR_L,
293 .prio = 0,
294 .force = IPIC_SIFCR_L,
295 .bit = 10,
296 },
297 [75] = {
298 .pend = IPIC_SIPNR_L,
299 .mask = IPIC_SIMSR_L,
300 .prio = 0,
301 .force = IPIC_SIFCR_L,
302 .bit = 11,
303 },
304 [76] = {
305 .pend = IPIC_SIPNR_L,
306 .mask = IPIC_SIMSR_L,
307 .prio = 0,
308 .force = IPIC_SIFCR_L,
309 .bit = 12,
310 },
311 [77] = {
312 .pend = IPIC_SIPNR_L,
313 .mask = IPIC_SIMSR_L,
314 .prio = 0,
315 .force = IPIC_SIFCR_L,
316 .bit = 13,
317 },
318 [78] = {
319 .pend = IPIC_SIPNR_L,
320 .mask = IPIC_SIMSR_L,
321 .prio = 0,
322 .force = IPIC_SIFCR_L,
323 .bit = 14,
324 },
325 [79] = {
326 .pend = IPIC_SIPNR_L,
327 .mask = IPIC_SIMSR_L,
328 .prio = 0,
329 .force = IPIC_SIFCR_L,
330 .bit = 15,
331 },
332 [80] = {
333 .pend = IPIC_SIPNR_L,
334 .mask = IPIC_SIMSR_L,
335 .prio = 0,
336 .force = IPIC_SIFCR_L,
337 .bit = 16,
338 },
339 [84] = {
340 .pend = IPIC_SIPNR_L,
341 .mask = IPIC_SIMSR_L,
342 .prio = 0,
343 .force = IPIC_SIFCR_L,
344 .bit = 20,
345 },
346 [85] = {
347 .pend = IPIC_SIPNR_L,
348 .mask = IPIC_SIMSR_L,
349 .prio = 0,
350 .force = IPIC_SIFCR_L,
351 .bit = 21,
352 },
353 [90] = {
354 .pend = IPIC_SIPNR_L,
355 .mask = IPIC_SIMSR_L,
356 .prio = 0,
357 .force = IPIC_SIFCR_L,
358 .bit = 26,
359 },
360 [91] = {
361 .pend = IPIC_SIPNR_L,
362 .mask = IPIC_SIMSR_L,
363 .prio = 0,
364 .force = IPIC_SIFCR_L,
365 .bit = 27,
366 },
367 };
368
369 static inline u32 ipic_read(volatile u32 __iomem *base, unsigned int reg)
370 {
371 return in_be32(base + (reg >> 2));
372 }
373
374 static inline void ipic_write(volatile u32 __iomem *base, unsigned int reg, u32 value)
375 {
376 out_be32(base + (reg >> 2), value);
377 }
378
379 static inline struct ipic * ipic_from_irq(unsigned int virq)
380 {
381 return primary_ipic;
382 }
383
384 #define ipic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq)
385
386 static void ipic_unmask_irq(unsigned int virq)
387 {
388 struct ipic *ipic = ipic_from_irq(virq);
389 unsigned int src = ipic_irq_to_hw(virq);
390 unsigned long flags;
391 u32 temp;
392
393 spin_lock_irqsave(&ipic_lock, flags);
394
395 temp = ipic_read(ipic->regs, ipic_info[src].mask);
396 temp |= (1 << (31 - ipic_info[src].bit));
397 ipic_write(ipic->regs, ipic_info[src].mask, temp);
398
399 spin_unlock_irqrestore(&ipic_lock, flags);
400 }
401
402 static void ipic_mask_irq(unsigned int virq)
403 {
404 struct ipic *ipic = ipic_from_irq(virq);
405 unsigned int src = ipic_irq_to_hw(virq);
406 unsigned long flags;
407 u32 temp;
408
409 spin_lock_irqsave(&ipic_lock, flags);
410
411 temp = ipic_read(ipic->regs, ipic_info[src].mask);
412 temp &= ~(1 << (31 - ipic_info[src].bit));
413 ipic_write(ipic->regs, ipic_info[src].mask, temp);
414
415 spin_unlock_irqrestore(&ipic_lock, flags);
416 }
417
418 static void ipic_ack_irq(unsigned int virq)
419 {
420 struct ipic *ipic = ipic_from_irq(virq);
421 unsigned int src = ipic_irq_to_hw(virq);
422 unsigned long flags;
423 u32 temp;
424
425 spin_lock_irqsave(&ipic_lock, flags);
426
427 temp = ipic_read(ipic->regs, ipic_info[src].pend);
428 temp |= (1 << (31 - ipic_info[src].bit));
429 ipic_write(ipic->regs, ipic_info[src].pend, temp);
430
431 spin_unlock_irqrestore(&ipic_lock, flags);
432 }
433
434 static void ipic_mask_irq_and_ack(unsigned int virq)
435 {
436 struct ipic *ipic = ipic_from_irq(virq);
437 unsigned int src = ipic_irq_to_hw(virq);
438 unsigned long flags;
439 u32 temp;
440
441 spin_lock_irqsave(&ipic_lock, flags);
442
443 temp = ipic_read(ipic->regs, ipic_info[src].mask);
444 temp &= ~(1 << (31 - ipic_info[src].bit));
445 ipic_write(ipic->regs, ipic_info[src].mask, temp);
446
447 temp = ipic_read(ipic->regs, ipic_info[src].pend);
448 temp |= (1 << (31 - ipic_info[src].bit));
449 ipic_write(ipic->regs, ipic_info[src].pend, temp);
450
451 spin_unlock_irqrestore(&ipic_lock, flags);
452 }
453
454 static int ipic_set_irq_type(unsigned int virq, unsigned int flow_type)
455 {
456 struct ipic *ipic = ipic_from_irq(virq);
457 unsigned int src = ipic_irq_to_hw(virq);
458 struct irq_desc *desc = get_irq_desc(virq);
459 unsigned int vold, vnew, edibit;
460
461 if (flow_type == IRQ_TYPE_NONE)
462 flow_type = IRQ_TYPE_LEVEL_LOW;
463
464 /* ipic supports only low assertion and high-to-low change senses
465 */
466 if (!(flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))) {
467 printk(KERN_ERR "ipic: sense type 0x%x not supported\n",
468 flow_type);
469 return -EINVAL;
470 }
471
472 desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
473 desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
474 if (flow_type & IRQ_TYPE_LEVEL_LOW) {
475 desc->status |= IRQ_LEVEL;
476 desc->handle_irq = handle_level_irq;
477 } else {
478 desc->handle_irq = handle_edge_irq;
479 }
480
481 /* only EXT IRQ senses are programmable on ipic
482 * internal IRQ senses are LEVEL_LOW
483 */
484 if (src == IPIC_IRQ_EXT0)
485 edibit = 15;
486 else
487 if (src >= IPIC_IRQ_EXT1 && src <= IPIC_IRQ_EXT7)
488 edibit = (14 - (src - IPIC_IRQ_EXT1));
489 else
490 return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -EINVAL;
491
492 vold = ipic_read(ipic->regs, IPIC_SECNR);
493 if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING) {
494 vnew = vold | (1 << edibit);
495 } else {
496 vnew = vold & ~(1 << edibit);
497 }
498 if (vold != vnew)
499 ipic_write(ipic->regs, IPIC_SECNR, vnew);
500 return 0;
501 }
502
503 static struct irq_chip ipic_irq_chip = {
504 .typename = " IPIC ",
505 .unmask = ipic_unmask_irq,
506 .mask = ipic_mask_irq,
507 .mask_ack = ipic_mask_irq_and_ack,
508 .ack = ipic_ack_irq,
509 .set_type = ipic_set_irq_type,
510 };
511
512 static int ipic_host_match(struct irq_host *h, struct device_node *node)
513 {
514 struct ipic *ipic = h->host_data;
515
516 /* Exact match, unless ipic node is NULL */
517 return ipic->of_node == NULL || ipic->of_node == node;
518 }
519
520 static int ipic_host_map(struct irq_host *h, unsigned int virq,
521 irq_hw_number_t hw)
522 {
523 struct ipic *ipic = h->host_data;
524 struct irq_chip *chip;
525
526 /* Default chip */
527 chip = &ipic->hc_irq;
528
529 set_irq_chip_data(virq, ipic);
530 set_irq_chip_and_handler(virq, chip, handle_level_irq);
531
532 /* Set default irq type */
533 set_irq_type(virq, IRQ_TYPE_NONE);
534
535 return 0;
536 }
537
538 static int ipic_host_xlate(struct irq_host *h, struct device_node *ct,
539 u32 *intspec, unsigned int intsize,
540 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
541
542 {
543 /* interrupt sense values coming from the device tree equal either
544 * LEVEL_LOW (low assertion) or EDGE_FALLING (high-to-low change)
545 */
546 *out_hwirq = intspec[0];
547 if (intsize > 1)
548 *out_flags = intspec[1];
549 else
550 *out_flags = IRQ_TYPE_NONE;
551 return 0;
552 }
553
554 static struct irq_host_ops ipic_host_ops = {
555 .match = ipic_host_match,
556 .map = ipic_host_map,
557 .xlate = ipic_host_xlate,
558 };
559
560 struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
561 {
562 struct ipic *ipic;
563 struct resource res;
564 u32 temp = 0, ret;
565
566 ipic = alloc_bootmem(sizeof(struct ipic));
567 if (ipic == NULL)
568 return NULL;
569
570 memset(ipic, 0, sizeof(struct ipic));
571 ipic->of_node = of_node_get(node);
572
573 ipic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
574 NR_IPIC_INTS,
575 &ipic_host_ops, 0);
576 if (ipic->irqhost == NULL) {
577 of_node_put(node);
578 return NULL;
579 }
580
581 ret = of_address_to_resource(node, 0, &res);
582 if (ret) {
583 of_node_put(node);
584 return NULL;
585 }
586
587 ipic->regs = ioremap(res.start, res.end - res.start + 1);
588
589 ipic->irqhost->host_data = ipic;
590 ipic->hc_irq = ipic_irq_chip;
591
592 /* init hw */
593 ipic_write(ipic->regs, IPIC_SICNR, 0x0);
594
595 /* default priority scheme is grouped. If spread mode is required
596 * configure SICFR accordingly */
597 if (flags & IPIC_SPREADMODE_GRP_A)
598 temp |= SICFR_IPSA;
599 if (flags & IPIC_SPREADMODE_GRP_D)
600 temp |= SICFR_IPSD;
601 if (flags & IPIC_SPREADMODE_MIX_A)
602 temp |= SICFR_MPSA;
603 if (flags & IPIC_SPREADMODE_MIX_B)
604 temp |= SICFR_MPSB;
605
606 ipic_write(ipic->regs, IPIC_SICNR, temp);
607
608 /* handle MCP route */
609 temp = 0;
610 if (flags & IPIC_DISABLE_MCP_OUT)
611 temp = SERCR_MCPR;
612 ipic_write(ipic->regs, IPIC_SERCR, temp);
613
614 /* handle routing of IRQ0 to MCP */
615 temp = ipic_read(ipic->regs, IPIC_SEMSR);
616
617 if (flags & IPIC_IRQ0_MCP)
618 temp |= SEMSR_SIRQ0;
619 else
620 temp &= ~SEMSR_SIRQ0;
621
622 ipic_write(ipic->regs, IPIC_SEMSR, temp);
623
624 primary_ipic = ipic;
625 irq_set_default_host(primary_ipic->irqhost);
626
627 printk ("IPIC (%d IRQ sources) at %p\n", NR_IPIC_INTS,
628 primary_ipic->regs);
629
630 return ipic;
631 }
632
633 int ipic_set_priority(unsigned int virq, unsigned int priority)
634 {
635 struct ipic *ipic = ipic_from_irq(virq);
636 unsigned int src = ipic_irq_to_hw(virq);
637 u32 temp;
638
639 if (priority > 7)
640 return -EINVAL;
641 if (src > 127)
642 return -EINVAL;
643 if (ipic_info[src].prio == 0)
644 return -EINVAL;
645
646 temp = ipic_read(ipic->regs, ipic_info[src].prio);
647
648 if (priority < 4) {
649 temp &= ~(0x7 << (20 + (3 - priority) * 3));
650 temp |= ipic_info[src].prio_mask << (20 + (3 - priority) * 3);
651 } else {
652 temp &= ~(0x7 << (4 + (7 - priority) * 3));
653 temp |= ipic_info[src].prio_mask << (4 + (7 - priority) * 3);
654 }
655
656 ipic_write(ipic->regs, ipic_info[src].prio, temp);
657
658 return 0;
659 }
660
661 void ipic_set_highest_priority(unsigned int virq)
662 {
663 struct ipic *ipic = ipic_from_irq(virq);
664 unsigned int src = ipic_irq_to_hw(virq);
665 u32 temp;
666
667 temp = ipic_read(ipic->regs, IPIC_SICFR);
668
669 /* clear and set HPI */
670 temp &= 0x7f000000;
671 temp |= (src & 0x7f) << 24;
672
673 ipic_write(ipic->regs, IPIC_SICFR, temp);
674 }
675
676 void ipic_set_default_priority(void)
677 {
678 ipic_write(primary_ipic->regs, IPIC_SIPRR_A, IPIC_SIPRR_A_DEFAULT);
679 ipic_write(primary_ipic->regs, IPIC_SIPRR_D, IPIC_SIPRR_D_DEFAULT);
680 ipic_write(primary_ipic->regs, IPIC_SMPRR_A, IPIC_SMPRR_A_DEFAULT);
681 ipic_write(primary_ipic->regs, IPIC_SMPRR_B, IPIC_SMPRR_B_DEFAULT);
682 }
683
684 void ipic_enable_mcp(enum ipic_mcp_irq mcp_irq)
685 {
686 struct ipic *ipic = primary_ipic;
687 u32 temp;
688
689 temp = ipic_read(ipic->regs, IPIC_SERMR);
690 temp |= (1 << (31 - mcp_irq));
691 ipic_write(ipic->regs, IPIC_SERMR, temp);
692 }
693
694 void ipic_disable_mcp(enum ipic_mcp_irq mcp_irq)
695 {
696 struct ipic *ipic = primary_ipic;
697 u32 temp;
698
699 temp = ipic_read(ipic->regs, IPIC_SERMR);
700 temp &= (1 << (31 - mcp_irq));
701 ipic_write(ipic->regs, IPIC_SERMR, temp);
702 }
703
704 u32 ipic_get_mcp_status(void)
705 {
706 return ipic_read(primary_ipic->regs, IPIC_SERMR);
707 }
708
709 void ipic_clear_mcp_status(u32 mask)
710 {
711 ipic_write(primary_ipic->regs, IPIC_SERMR, mask);
712 }
713
714 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
715 unsigned int ipic_get_irq(void)
716 {
717 int irq;
718
719 BUG_ON(primary_ipic == NULL);
720
721 #define IPIC_SIVCR_VECTOR_MASK 0x7f
722 irq = ipic_read(primary_ipic->regs, IPIC_SIVCR) & IPIC_SIVCR_VECTOR_MASK;
723
724 if (irq == 0) /* 0 --> no irq is pending */
725 return NO_IRQ;
726
727 return irq_linear_revmap(primary_ipic->irqhost, irq);
728 }
729
730 static struct sysdev_class ipic_sysclass = {
731 set_kset_name("ipic"),
732 };
733
734 static struct sys_device device_ipic = {
735 .id = 0,
736 .cls = &ipic_sysclass,
737 };
738
739 static int __init init_ipic_sysfs(void)
740 {
741 int rc;
742
743 if (!primary_ipic->regs)
744 return -ENODEV;
745 printk(KERN_DEBUG "Registering ipic with sysfs...\n");
746
747 rc = sysdev_class_register(&ipic_sysclass);
748 if (rc) {
749 printk(KERN_ERR "Failed registering ipic sys class\n");
750 return -ENODEV;
751 }
752 rc = sysdev_register(&device_ipic);
753 if (rc) {
754 printk(KERN_ERR "Failed registering ipic sys device\n");
755 return -ENODEV;
756 }
757 return 0;
758 }
759
760 subsys_initcall(init_ipic_sysfs);
Linux kernel - Deliverables
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