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Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6
[wrt350n-kernel.git] / arch / powerpc / sysdev / ipic.c
blobae0dbf4c1d66499b6b64f8f31f7b711062ca13ea
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 struct irq_chip ipic_level_irq_chip, ipic_edge_irq_chip;
34 static DEFINE_SPINLOCK(ipic_lock);
35
36 static struct ipic_info ipic_info[] = {
37 [1] = {
38 .mask = IPIC_SIMSR_H,
39 .prio = IPIC_SIPRR_C,
40 .force = IPIC_SIFCR_H,
41 .bit = 16,
42 .prio_mask = 0,
43 },
44 [2] = {
45 .mask = IPIC_SIMSR_H,
46 .prio = IPIC_SIPRR_C,
47 .force = IPIC_SIFCR_H,
48 .bit = 17,
49 .prio_mask = 1,
50 },
51 [3] = {
52 .mask = IPIC_SIMSR_H,
53 .prio = IPIC_SIPRR_C,
54 .force = IPIC_SIFCR_H,
55 .bit = 18,
56 .prio_mask = 2,
57 },
58 [4] = {
59 .mask = IPIC_SIMSR_H,
60 .prio = IPIC_SIPRR_C,
61 .force = IPIC_SIFCR_H,
62 .bit = 19,
63 .prio_mask = 3,
64 },
65 [5] = {
66 .mask = IPIC_SIMSR_H,
67 .prio = IPIC_SIPRR_C,
68 .force = IPIC_SIFCR_H,
69 .bit = 20,
70 .prio_mask = 4,
71 },
72 [6] = {
73 .mask = IPIC_SIMSR_H,
74 .prio = IPIC_SIPRR_C,
75 .force = IPIC_SIFCR_H,
76 .bit = 21,
77 .prio_mask = 5,
78 },
79 [7] = {
80 .mask = IPIC_SIMSR_H,
81 .prio = IPIC_SIPRR_C,
82 .force = IPIC_SIFCR_H,
83 .bit = 22,
84 .prio_mask = 6,
85 },
86 [8] = {
87 .mask = IPIC_SIMSR_H,
88 .prio = IPIC_SIPRR_C,
89 .force = IPIC_SIFCR_H,
90 .bit = 23,
91 .prio_mask = 7,
92 },
93 [9] = {
94 .mask = IPIC_SIMSR_H,
95 .prio = IPIC_SIPRR_D,
96 .force = IPIC_SIFCR_H,
97 .bit = 24,
98 .prio_mask = 0,
99 },
100 [10] = {
101 .mask = IPIC_SIMSR_H,
102 .prio = IPIC_SIPRR_D,
103 .force = IPIC_SIFCR_H,
104 .bit = 25,
105 .prio_mask = 1,
106 },
107 [11] = {
108 .mask = IPIC_SIMSR_H,
109 .prio = IPIC_SIPRR_D,
110 .force = IPIC_SIFCR_H,
111 .bit = 26,
112 .prio_mask = 2,
113 },
114 [12] = {
115 .mask = IPIC_SIMSR_H,
116 .prio = IPIC_SIPRR_D,
117 .force = IPIC_SIFCR_H,
118 .bit = 27,
119 .prio_mask = 3,
120 },
121 [13] = {
122 .mask = IPIC_SIMSR_H,
123 .prio = IPIC_SIPRR_D,
124 .force = IPIC_SIFCR_H,
125 .bit = 28,
126 .prio_mask = 4,
127 },
128 [14] = {
129 .mask = IPIC_SIMSR_H,
130 .prio = IPIC_SIPRR_D,
131 .force = IPIC_SIFCR_H,
132 .bit = 29,
133 .prio_mask = 5,
134 },
135 [15] = {
136 .mask = IPIC_SIMSR_H,
137 .prio = IPIC_SIPRR_D,
138 .force = IPIC_SIFCR_H,
139 .bit = 30,
140 .prio_mask = 6,
141 },
142 [16] = {
143 .mask = IPIC_SIMSR_H,
144 .prio = IPIC_SIPRR_D,
145 .force = IPIC_SIFCR_H,
146 .bit = 31,
147 .prio_mask = 7,
148 },
149 [17] = {
150 .ack = IPIC_SEPNR,
151 .mask = IPIC_SEMSR,
152 .prio = IPIC_SMPRR_A,
153 .force = IPIC_SEFCR,
154 .bit = 1,
155 .prio_mask = 5,
156 },
157 [18] = {
158 .ack = IPIC_SEPNR,
159 .mask = IPIC_SEMSR,
160 .prio = IPIC_SMPRR_A,
161 .force = IPIC_SEFCR,
162 .bit = 2,
163 .prio_mask = 6,
164 },
165 [19] = {
166 .ack = IPIC_SEPNR,
167 .mask = IPIC_SEMSR,
168 .prio = IPIC_SMPRR_A,
169 .force = IPIC_SEFCR,
170 .bit = 3,
171 .prio_mask = 7,
172 },
173 [20] = {
174 .ack = IPIC_SEPNR,
175 .mask = IPIC_SEMSR,
176 .prio = IPIC_SMPRR_B,
177 .force = IPIC_SEFCR,
178 .bit = 4,
179 .prio_mask = 4,
180 },
181 [21] = {
182 .ack = IPIC_SEPNR,
183 .mask = IPIC_SEMSR,
184 .prio = IPIC_SMPRR_B,
185 .force = IPIC_SEFCR,
186 .bit = 5,
187 .prio_mask = 5,
188 },
189 [22] = {
190 .ack = IPIC_SEPNR,
191 .mask = IPIC_SEMSR,
192 .prio = IPIC_SMPRR_B,
193 .force = IPIC_SEFCR,
194 .bit = 6,
195 .prio_mask = 6,
196 },
197 [23] = {
198 .ack = IPIC_SEPNR,
199 .mask = IPIC_SEMSR,
200 .prio = IPIC_SMPRR_B,
201 .force = IPIC_SEFCR,
202 .bit = 7,
203 .prio_mask = 7,
204 },
205 [32] = {
206 .mask = IPIC_SIMSR_H,
207 .prio = IPIC_SIPRR_A,
208 .force = IPIC_SIFCR_H,
209 .bit = 0,
210 .prio_mask = 0,
211 },
212 [33] = {
213 .mask = IPIC_SIMSR_H,
214 .prio = IPIC_SIPRR_A,
215 .force = IPIC_SIFCR_H,
216 .bit = 1,
217 .prio_mask = 1,
218 },
219 [34] = {
220 .mask = IPIC_SIMSR_H,
221 .prio = IPIC_SIPRR_A,
222 .force = IPIC_SIFCR_H,
223 .bit = 2,
224 .prio_mask = 2,
225 },
226 [35] = {
227 .mask = IPIC_SIMSR_H,
228 .prio = IPIC_SIPRR_A,
229 .force = IPIC_SIFCR_H,
230 .bit = 3,
231 .prio_mask = 3,
232 },
233 [36] = {
234 .mask = IPIC_SIMSR_H,
235 .prio = IPIC_SIPRR_A,
236 .force = IPIC_SIFCR_H,
237 .bit = 4,
238 .prio_mask = 4,
239 },
240 [37] = {
241 .mask = IPIC_SIMSR_H,
242 .prio = IPIC_SIPRR_A,
243 .force = IPIC_SIFCR_H,
244 .bit = 5,
245 .prio_mask = 5,
246 },
247 [38] = {
248 .mask = IPIC_SIMSR_H,
249 .prio = IPIC_SIPRR_A,
250 .force = IPIC_SIFCR_H,
251 .bit = 6,
252 .prio_mask = 6,
253 },
254 [39] = {
255 .mask = IPIC_SIMSR_H,
256 .prio = IPIC_SIPRR_A,
257 .force = IPIC_SIFCR_H,
258 .bit = 7,
259 .prio_mask = 7,
260 },
261 [40] = {
262 .mask = IPIC_SIMSR_H,
263 .prio = IPIC_SIPRR_B,
264 .force = IPIC_SIFCR_H,
265 .bit = 8,
266 .prio_mask = 0,
267 },
268 [41] = {
269 .mask = IPIC_SIMSR_H,
270 .prio = IPIC_SIPRR_B,
271 .force = IPIC_SIFCR_H,
272 .bit = 9,
273 .prio_mask = 1,
274 },
275 [42] = {
276 .mask = IPIC_SIMSR_H,
277 .prio = IPIC_SIPRR_B,
278 .force = IPIC_SIFCR_H,
279 .bit = 10,
280 .prio_mask = 2,
281 },
282 [43] = {
283 .mask = IPIC_SIMSR_H,
284 .prio = IPIC_SIPRR_B,
285 .force = IPIC_SIFCR_H,
286 .bit = 11,
287 .prio_mask = 3,
288 },
289 [44] = {
290 .mask = IPIC_SIMSR_H,
291 .prio = IPIC_SIPRR_B,
292 .force = IPIC_SIFCR_H,
293 .bit = 12,
294 .prio_mask = 4,
295 },
296 [45] = {
297 .mask = IPIC_SIMSR_H,
298 .prio = IPIC_SIPRR_B,
299 .force = IPIC_SIFCR_H,
300 .bit = 13,
301 .prio_mask = 5,
302 },
303 [46] = {
304 .mask = IPIC_SIMSR_H,
305 .prio = IPIC_SIPRR_B,
306 .force = IPIC_SIFCR_H,
307 .bit = 14,
308 .prio_mask = 6,
309 },
310 [47] = {
311 .mask = IPIC_SIMSR_H,
312 .prio = IPIC_SIPRR_B,
313 .force = IPIC_SIFCR_H,
314 .bit = 15,
315 .prio_mask = 7,
316 },
317 [48] = {
318 .mask = IPIC_SEMSR,
319 .prio = IPIC_SMPRR_A,
320 .force = IPIC_SEFCR,
321 .bit = 0,
322 .prio_mask = 4,
323 },
324 [64] = {
325 .mask = IPIC_SIMSR_L,
326 .prio = IPIC_SMPRR_A,
327 .force = IPIC_SIFCR_L,
328 .bit = 0,
329 .prio_mask = 0,
330 },
331 [65] = {
332 .mask = IPIC_SIMSR_L,
333 .prio = IPIC_SMPRR_A,
334 .force = IPIC_SIFCR_L,
335 .bit = 1,
336 .prio_mask = 1,
337 },
338 [66] = {
339 .mask = IPIC_SIMSR_L,
340 .prio = IPIC_SMPRR_A,
341 .force = IPIC_SIFCR_L,
342 .bit = 2,
343 .prio_mask = 2,
344 },
345 [67] = {
346 .mask = IPIC_SIMSR_L,
347 .prio = IPIC_SMPRR_A,
348 .force = IPIC_SIFCR_L,
349 .bit = 3,
350 .prio_mask = 3,
351 },
352 [68] = {
353 .mask = IPIC_SIMSR_L,
354 .prio = IPIC_SMPRR_B,
355 .force = IPIC_SIFCR_L,
356 .bit = 4,
357 .prio_mask = 0,
358 },
359 [69] = {
360 .mask = IPIC_SIMSR_L,
361 .prio = IPIC_SMPRR_B,
362 .force = IPIC_SIFCR_L,
363 .bit = 5,
364 .prio_mask = 1,
365 },
366 [70] = {
367 .mask = IPIC_SIMSR_L,
368 .prio = IPIC_SMPRR_B,
369 .force = IPIC_SIFCR_L,
370 .bit = 6,
371 .prio_mask = 2,
372 },
373 [71] = {
374 .mask = IPIC_SIMSR_L,
375 .prio = IPIC_SMPRR_B,
376 .force = IPIC_SIFCR_L,
377 .bit = 7,
378 .prio_mask = 3,
379 },
380 [72] = {
381 .mask = IPIC_SIMSR_L,
382 .prio = 0,
383 .force = IPIC_SIFCR_L,
384 .bit = 8,
385 },
386 [73] = {
387 .mask = IPIC_SIMSR_L,
388 .prio = 0,
389 .force = IPIC_SIFCR_L,
390 .bit = 9,
391 },
392 [74] = {
393 .mask = IPIC_SIMSR_L,
394 .prio = 0,
395 .force = IPIC_SIFCR_L,
396 .bit = 10,
397 },
398 [75] = {
399 .mask = IPIC_SIMSR_L,
400 .prio = 0,
401 .force = IPIC_SIFCR_L,
402 .bit = 11,
403 },
404 [76] = {
405 .mask = IPIC_SIMSR_L,
406 .prio = 0,
407 .force = IPIC_SIFCR_L,
408 .bit = 12,
409 },
410 [77] = {
411 .mask = IPIC_SIMSR_L,
412 .prio = 0,
413 .force = IPIC_SIFCR_L,
414 .bit = 13,
415 },
416 [78] = {
417 .mask = IPIC_SIMSR_L,
418 .prio = 0,
419 .force = IPIC_SIFCR_L,
420 .bit = 14,
421 },
422 [79] = {
423 .mask = IPIC_SIMSR_L,
424 .prio = 0,
425 .force = IPIC_SIFCR_L,
426 .bit = 15,
427 },
428 [80] = {
429 .mask = IPIC_SIMSR_L,
430 .prio = 0,
431 .force = IPIC_SIFCR_L,
432 .bit = 16,
433 },
434 [81] = {
435 .mask = IPIC_SIMSR_L,
436 .prio = 0,
437 .force = IPIC_SIFCR_L,
438 .bit = 17,
439 },
440 [82] = {
441 .mask = IPIC_SIMSR_L,
442 .prio = 0,
443 .force = IPIC_SIFCR_L,
444 .bit = 18,
445 },
446 [83] = {
447 .mask = IPIC_SIMSR_L,
448 .prio = 0,
449 .force = IPIC_SIFCR_L,
450 .bit = 19,
451 },
452 [84] = {
453 .mask = IPIC_SIMSR_L,
454 .prio = 0,
455 .force = IPIC_SIFCR_L,
456 .bit = 20,
457 },
458 [85] = {
459 .mask = IPIC_SIMSR_L,
460 .prio = 0,
461 .force = IPIC_SIFCR_L,
462 .bit = 21,
463 },
464 [86] = {
465 .mask = IPIC_SIMSR_L,
466 .prio = 0,
467 .force = IPIC_SIFCR_L,
468 .bit = 22,
469 },
470 [87] = {
471 .mask = IPIC_SIMSR_L,
472 .prio = 0,
473 .force = IPIC_SIFCR_L,
474 .bit = 23,
475 },
476 [88] = {
477 .mask = IPIC_SIMSR_L,
478 .prio = 0,
479 .force = IPIC_SIFCR_L,
480 .bit = 24,
481 },
482 [89] = {
483 .mask = IPIC_SIMSR_L,
484 .prio = 0,
485 .force = IPIC_SIFCR_L,
486 .bit = 25,
487 },
488 [90] = {
489 .mask = IPIC_SIMSR_L,
490 .prio = 0,
491 .force = IPIC_SIFCR_L,
492 .bit = 26,
493 },
494 [91] = {
495 .mask = IPIC_SIMSR_L,
496 .prio = 0,
497 .force = IPIC_SIFCR_L,
498 .bit = 27,
499 },
500 [94] = {
501 .mask = IPIC_SIMSR_L,
502 .prio = 0,
503 .force = IPIC_SIFCR_L,
504 .bit = 30,
505 },
506 };
507
508 static inline u32 ipic_read(volatile u32 __iomem *base, unsigned int reg)
509 {
510 return in_be32(base + (reg >> 2));
511 }
512
513 static inline void ipic_write(volatile u32 __iomem *base, unsigned int reg, u32 value)
514 {
515 out_be32(base + (reg >> 2), value);
516 }
517
518 static inline struct ipic * ipic_from_irq(unsigned int virq)
519 {
520 return primary_ipic;
521 }
522
523 #define ipic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq)
524
525 static void ipic_unmask_irq(unsigned int virq)
526 {
527 struct ipic *ipic = ipic_from_irq(virq);
528 unsigned int src = ipic_irq_to_hw(virq);
529 unsigned long flags;
530 u32 temp;
531
532 spin_lock_irqsave(&ipic_lock, flags);
533
534 temp = ipic_read(ipic->regs, ipic_info[src].mask);
535 temp |= (1 << (31 - ipic_info[src].bit));
536 ipic_write(ipic->regs, ipic_info[src].mask, temp);
537
538 spin_unlock_irqrestore(&ipic_lock, flags);
539 }
540
541 static void ipic_mask_irq(unsigned int virq)
542 {
543 struct ipic *ipic = ipic_from_irq(virq);
544 unsigned int src = ipic_irq_to_hw(virq);
545 unsigned long flags;
546 u32 temp;
547
548 spin_lock_irqsave(&ipic_lock, flags);
549
550 temp = ipic_read(ipic->regs, ipic_info[src].mask);
551 temp &= ~(1 << (31 - ipic_info[src].bit));
552 ipic_write(ipic->regs, ipic_info[src].mask, temp);
553
554 /* mb() can't guarantee that masking is finished. But it does finish
555 * for nearly all cases. */
556 mb();
557
558 spin_unlock_irqrestore(&ipic_lock, flags);
559 }
560
561 static void ipic_ack_irq(unsigned int virq)
562 {
563 struct ipic *ipic = ipic_from_irq(virq);
564 unsigned int src = ipic_irq_to_hw(virq);
565 unsigned long flags;
566 u32 temp;
567
568 spin_lock_irqsave(&ipic_lock, flags);
569
570 temp = ipic_read(ipic->regs, ipic_info[src].ack);
571 temp |= (1 << (31 - ipic_info[src].bit));
572 ipic_write(ipic->regs, ipic_info[src].ack, temp);
573
574 /* mb() can't guarantee that ack is finished. But it does finish
575 * for nearly all cases. */
576 mb();
577
578 spin_unlock_irqrestore(&ipic_lock, flags);
579 }
580
581 static void ipic_mask_irq_and_ack(unsigned int virq)
582 {
583 struct ipic *ipic = ipic_from_irq(virq);
584 unsigned int src = ipic_irq_to_hw(virq);
585 unsigned long flags;
586 u32 temp;
587
588 spin_lock_irqsave(&ipic_lock, flags);
589
590 temp = ipic_read(ipic->regs, ipic_info[src].mask);
591 temp &= ~(1 << (31 - ipic_info[src].bit));
592 ipic_write(ipic->regs, ipic_info[src].mask, temp);
593
594 temp = ipic_read(ipic->regs, ipic_info[src].ack);
595 temp |= (1 << (31 - ipic_info[src].bit));
596 ipic_write(ipic->regs, ipic_info[src].ack, temp);
597
598 /* mb() can't guarantee that ack is finished. But it does finish
599 * for nearly all cases. */
600 mb();
601
602 spin_unlock_irqrestore(&ipic_lock, flags);
603 }
604
605 static int ipic_set_irq_type(unsigned int virq, unsigned int flow_type)
606 {
607 struct ipic *ipic = ipic_from_irq(virq);
608 unsigned int src = ipic_irq_to_hw(virq);
609 struct irq_desc *desc = get_irq_desc(virq);
610 unsigned int vold, vnew, edibit;
611
612 if (flow_type == IRQ_TYPE_NONE)
613 flow_type = IRQ_TYPE_LEVEL_LOW;
614
615 /* ipic supports only low assertion and high-to-low change senses
616 */
617 if (!(flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))) {
618 printk(KERN_ERR "ipic: sense type 0x%x not supported\n",
619 flow_type);
620 return -EINVAL;
621 }
622 /* ipic supports only edge mode on external interrupts */
623 if ((flow_type & IRQ_TYPE_EDGE_FALLING) && !ipic_info[src].ack) {
624 printk(KERN_ERR "ipic: edge sense not supported on internal "
625 "interrupts\n");
626 return -EINVAL;
627 }
628
629 desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
630 desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
631 if (flow_type & IRQ_TYPE_LEVEL_LOW) {
632 desc->status |= IRQ_LEVEL;
633 desc->handle_irq = handle_level_irq;
634 desc->chip = &ipic_level_irq_chip;
635 } else {
636 desc->handle_irq = handle_edge_irq;
637 desc->chip = &ipic_edge_irq_chip;
638 }
639
640 /* only EXT IRQ senses are programmable on ipic
641 * internal IRQ senses are LEVEL_LOW
642 */
643 if (src == IPIC_IRQ_EXT0)
644 edibit = 15;
645 else
646 if (src >= IPIC_IRQ_EXT1 && src <= IPIC_IRQ_EXT7)
647 edibit = (14 - (src - IPIC_IRQ_EXT1));
648 else
649 return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -EINVAL;
650
651 vold = ipic_read(ipic->regs, IPIC_SECNR);
652 if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING) {
653 vnew = vold | (1 << edibit);
654 } else {
655 vnew = vold & ~(1 << edibit);
656 }
657 if (vold != vnew)
658 ipic_write(ipic->regs, IPIC_SECNR, vnew);
659 return 0;
660 }
661
662 /* level interrupts and edge interrupts have different ack operations */
663 static struct irq_chip ipic_level_irq_chip = {
664 .typename = " IPIC ",
665 .unmask = ipic_unmask_irq,
666 .mask = ipic_mask_irq,
667 .mask_ack = ipic_mask_irq,
668 .set_type = ipic_set_irq_type,
669 };
670
671 static struct irq_chip ipic_edge_irq_chip = {
672 .typename = " IPIC ",
673 .unmask = ipic_unmask_irq,
674 .mask = ipic_mask_irq,
675 .mask_ack = ipic_mask_irq_and_ack,
676 .ack = ipic_ack_irq,
677 .set_type = ipic_set_irq_type,
678 };
679
680 static int ipic_host_match(struct irq_host *h, struct device_node *node)
681 {
682 /* Exact match, unless ipic node is NULL */
683 return h->of_node == NULL || h->of_node == node;
684 }
685
686 static int ipic_host_map(struct irq_host *h, unsigned int virq,
687 irq_hw_number_t hw)
688 {
689 struct ipic *ipic = h->host_data;
690
691 set_irq_chip_data(virq, ipic);
692 set_irq_chip_and_handler(virq, &ipic_level_irq_chip, handle_level_irq);
693
694 /* Set default irq type */
695 set_irq_type(virq, IRQ_TYPE_NONE);
696
697 return 0;
698 }
699
700 static int ipic_host_xlate(struct irq_host *h, struct device_node *ct,
701 u32 *intspec, unsigned int intsize,
702 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
703
704 {
705 /* interrupt sense values coming from the device tree equal either
706 * LEVEL_LOW (low assertion) or EDGE_FALLING (high-to-low change)
707 */
708 *out_hwirq = intspec[0];
709 if (intsize > 1)
710 *out_flags = intspec[1];
711 else
712 *out_flags = IRQ_TYPE_NONE;
713 return 0;
714 }
715
716 static struct irq_host_ops ipic_host_ops = {
717 .match = ipic_host_match,
718 .map = ipic_host_map,
719 .xlate = ipic_host_xlate,
720 };
721
722 struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
723 {
724 struct ipic *ipic;
725 struct resource res;
726 u32 temp = 0, ret;
727
728 ipic = alloc_bootmem(sizeof(struct ipic));
729 if (ipic == NULL)
730 return NULL;
731
732 memset(ipic, 0, sizeof(struct ipic));
733
734 ipic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
735 NR_IPIC_INTS,
736 &ipic_host_ops, 0);
737 if (ipic->irqhost == NULL) {
738 of_node_put(node);
739 return NULL;
740 }
741
742 ret = of_address_to_resource(node, 0, &res);
743 if (ret) {
744 of_node_put(node);
745 return NULL;
746 }
747
748 ipic->regs = ioremap(res.start, res.end - res.start + 1);
749
750 ipic->irqhost->host_data = ipic;
751
752 /* init hw */
753 ipic_write(ipic->regs, IPIC_SICNR, 0x0);
754
755 /* default priority scheme is grouped. If spread mode is required
756 * configure SICFR accordingly */
757 if (flags & IPIC_SPREADMODE_GRP_A)
758 temp |= SICFR_IPSA;
759 if (flags & IPIC_SPREADMODE_GRP_B)
760 temp |= SICFR_IPSB;
761 if (flags & IPIC_SPREADMODE_GRP_C)
762 temp |= SICFR_IPSC;
763 if (flags & IPIC_SPREADMODE_GRP_D)
764 temp |= SICFR_IPSD;
765 if (flags & IPIC_SPREADMODE_MIX_A)
766 temp |= SICFR_MPSA;
767 if (flags & IPIC_SPREADMODE_MIX_B)
768 temp |= SICFR_MPSB;
769
770 ipic_write(ipic->regs, IPIC_SICFR, temp);
771
772 /* handle MCP route */
773 temp = 0;
774 if (flags & IPIC_DISABLE_MCP_OUT)
775 temp = SERCR_MCPR;
776 ipic_write(ipic->regs, IPIC_SERCR, temp);
777
778 /* handle routing of IRQ0 to MCP */
779 temp = ipic_read(ipic->regs, IPIC_SEMSR);
780
781 if (flags & IPIC_IRQ0_MCP)
782 temp |= SEMSR_SIRQ0;
783 else
784 temp &= ~SEMSR_SIRQ0;
785
786 ipic_write(ipic->regs, IPIC_SEMSR, temp);
787
788 primary_ipic = ipic;
789 irq_set_default_host(primary_ipic->irqhost);
790
791 printk ("IPIC (%d IRQ sources) at %p\n", NR_IPIC_INTS,
792 primary_ipic->regs);
793
794 return ipic;
795 }
796
797 int ipic_set_priority(unsigned int virq, unsigned int priority)
798 {
799 struct ipic *ipic = ipic_from_irq(virq);
800 unsigned int src = ipic_irq_to_hw(virq);
801 u32 temp;
802
803 if (priority > 7)
804 return -EINVAL;
805 if (src > 127)
806 return -EINVAL;
807 if (ipic_info[src].prio == 0)
808 return -EINVAL;
809
810 temp = ipic_read(ipic->regs, ipic_info[src].prio);
811
812 if (priority < 4) {
813 temp &= ~(0x7 << (20 + (3 - priority) * 3));
814 temp |= ipic_info[src].prio_mask << (20 + (3 - priority) * 3);
815 } else {
816 temp &= ~(0x7 << (4 + (7 - priority) * 3));
817 temp |= ipic_info[src].prio_mask << (4 + (7 - priority) * 3);
818 }
819
820 ipic_write(ipic->regs, ipic_info[src].prio, temp);
821
822 return 0;
823 }
824
825 void ipic_set_highest_priority(unsigned int virq)
826 {
827 struct ipic *ipic = ipic_from_irq(virq);
828 unsigned int src = ipic_irq_to_hw(virq);
829 u32 temp;
830
831 temp = ipic_read(ipic->regs, IPIC_SICFR);
832
833 /* clear and set HPI */
834 temp &= 0x7f000000;
835 temp |= (src & 0x7f) << 24;
836
837 ipic_write(ipic->regs, IPIC_SICFR, temp);
838 }
839
840 void ipic_set_default_priority(void)
841 {
842 ipic_write(primary_ipic->regs, IPIC_SIPRR_A, IPIC_PRIORITY_DEFAULT);
843 ipic_write(primary_ipic->regs, IPIC_SIPRR_B, IPIC_PRIORITY_DEFAULT);
844 ipic_write(primary_ipic->regs, IPIC_SIPRR_C, IPIC_PRIORITY_DEFAULT);
845 ipic_write(primary_ipic->regs, IPIC_SIPRR_D, IPIC_PRIORITY_DEFAULT);
846 ipic_write(primary_ipic->regs, IPIC_SMPRR_A, IPIC_PRIORITY_DEFAULT);
847 ipic_write(primary_ipic->regs, IPIC_SMPRR_B, IPIC_PRIORITY_DEFAULT);
848 }
849
850 void ipic_enable_mcp(enum ipic_mcp_irq mcp_irq)
851 {
852 struct ipic *ipic = primary_ipic;
853 u32 temp;
854
855 temp = ipic_read(ipic->regs, IPIC_SERMR);
856 temp |= (1 << (31 - mcp_irq));
857 ipic_write(ipic->regs, IPIC_SERMR, temp);
858 }
859
860 void ipic_disable_mcp(enum ipic_mcp_irq mcp_irq)
861 {
862 struct ipic *ipic = primary_ipic;
863 u32 temp;
864
865 temp = ipic_read(ipic->regs, IPIC_SERMR);
866 temp &= (1 << (31 - mcp_irq));
867 ipic_write(ipic->regs, IPIC_SERMR, temp);
868 }
869
870 u32 ipic_get_mcp_status(void)
871 {
872 return ipic_read(primary_ipic->regs, IPIC_SERMR);
873 }
874
875 void ipic_clear_mcp_status(u32 mask)
876 {
877 ipic_write(primary_ipic->regs, IPIC_SERMR, mask);
878 }
879
880 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
881 unsigned int ipic_get_irq(void)
882 {
883 int irq;
884
885 BUG_ON(primary_ipic == NULL);
886
887 #define IPIC_SIVCR_VECTOR_MASK 0x7f
888 irq = ipic_read(primary_ipic->regs, IPIC_SIVCR) & IPIC_SIVCR_VECTOR_MASK;
889
890 if (irq == 0) /* 0 --> no irq is pending */
891 return NO_IRQ;
892
893 return irq_linear_revmap(primary_ipic->irqhost, irq);
894 }
895
896 static struct sysdev_class ipic_sysclass = {
897 .name = "ipic",
898 };
899
900 static struct sys_device device_ipic = {
901 .id = 0,
902 .cls = &ipic_sysclass,
903 };
904
905 static int __init init_ipic_sysfs(void)
906 {
907 int rc;
908
909 if (!primary_ipic->regs)
910 return -ENODEV;
911 printk(KERN_DEBUG "Registering ipic with sysfs...\n");
912
913 rc = sysdev_class_register(&ipic_sysclass);
914 if (rc) {
915 printk(KERN_ERR "Failed registering ipic sys class\n");
916 return -ENODEV;
917 }
918 rc = sysdev_register(&device_ipic);
919 if (rc) {
920 printk(KERN_ERR "Failed registering ipic sys device\n");
921 return -ENODEV;
922 }
923 return 0;
924 }
925
926 subsys_initcall(init_ipic_sysfs);
WRT350N Kernel Patches