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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / arch / ppc / syslib / ipic.c
blobacb2cde3171f8d141b7f38f95e9def9a62210851
1 /*
2 * include/asm-ppc/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 <asm/irq.h>
23 #include <asm/io.h>
24 #include <asm/ipic.h>
25 #include <asm/mpc83xx.h>
26
27 #include "ipic.h"
28
29 static struct ipic p_ipic;
30 static struct ipic * primary_ipic;
31
32 static struct ipic_info ipic_info[] = {
33 [9] = {
34 .pend = IPIC_SIPNR_H,
35 .mask = IPIC_SIMSR_H,
36 .prio = IPIC_SIPRR_D,
37 .force = IPIC_SIFCR_H,
38 .bit = 24,
39 .prio_mask = 0,
40 },
41 [10] = {
42 .pend = IPIC_SIPNR_H,
43 .mask = IPIC_SIMSR_H,
44 .prio = IPIC_SIPRR_D,
45 .force = IPIC_SIFCR_H,
46 .bit = 25,
47 .prio_mask = 1,
48 },
49 [11] = {
50 .pend = IPIC_SIPNR_H,
51 .mask = IPIC_SIMSR_H,
52 .prio = IPIC_SIPRR_D,
53 .force = IPIC_SIFCR_H,
54 .bit = 26,
55 .prio_mask = 2,
56 },
57 [14] = {
58 .pend = IPIC_SIPNR_H,
59 .mask = IPIC_SIMSR_H,
60 .prio = IPIC_SIPRR_D,
61 .force = IPIC_SIFCR_H,
62 .bit = 29,
63 .prio_mask = 5,
64 },
65 [15] = {
66 .pend = IPIC_SIPNR_H,
67 .mask = IPIC_SIMSR_H,
68 .prio = IPIC_SIPRR_D,
69 .force = IPIC_SIFCR_H,
70 .bit = 30,
71 .prio_mask = 6,
72 },
73 [16] = {
74 .pend = IPIC_SIPNR_H,
75 .mask = IPIC_SIMSR_H,
76 .prio = IPIC_SIPRR_D,
77 .force = IPIC_SIFCR_H,
78 .bit = 31,
79 .prio_mask = 7,
80 },
81 [17] = {
82 .pend = IPIC_SIPNR_H,
83 .mask = IPIC_SEMSR,
84 .prio = IPIC_SMPRR_A,
85 .force = IPIC_SEFCR,
86 .bit = 1,
87 .prio_mask = 5,
88 },
89 [18] = {
90 .pend = IPIC_SIPNR_H,
91 .mask = IPIC_SEMSR,
92 .prio = IPIC_SMPRR_A,
93 .force = IPIC_SEFCR,
94 .bit = 2,
95 .prio_mask = 6,
96 },
97 [19] = {
98 .pend = IPIC_SIPNR_H,
99 .mask = IPIC_SEMSR,
100 .prio = IPIC_SMPRR_A,
101 .force = IPIC_SEFCR,
102 .bit = 3,
103 .prio_mask = 7,
104 },
105 [20] = {
106 .pend = IPIC_SIPNR_H,
107 .mask = IPIC_SEMSR,
108 .prio = IPIC_SMPRR_B,
109 .force = IPIC_SEFCR,
110 .bit = 4,
111 .prio_mask = 4,
112 },
113 [21] = {
114 .pend = IPIC_SIPNR_H,
115 .mask = IPIC_SEMSR,
116 .prio = IPIC_SMPRR_B,
117 .force = IPIC_SEFCR,
118 .bit = 5,
119 .prio_mask = 5,
120 },
121 [22] = {
122 .pend = IPIC_SIPNR_H,
123 .mask = IPIC_SEMSR,
124 .prio = IPIC_SMPRR_B,
125 .force = IPIC_SEFCR,
126 .bit = 6,
127 .prio_mask = 6,
128 },
129 [23] = {
130 .pend = IPIC_SIPNR_H,
131 .mask = IPIC_SEMSR,
132 .prio = IPIC_SMPRR_B,
133 .force = IPIC_SEFCR,
134 .bit = 7,
135 .prio_mask = 7,
136 },
137 [32] = {
138 .pend = IPIC_SIPNR_H,
139 .mask = IPIC_SIMSR_H,
140 .prio = IPIC_SIPRR_A,
141 .force = IPIC_SIFCR_H,
142 .bit = 0,
143 .prio_mask = 0,
144 },
145 [33] = {
146 .pend = IPIC_SIPNR_H,
147 .mask = IPIC_SIMSR_H,
148 .prio = IPIC_SIPRR_A,
149 .force = IPIC_SIFCR_H,
150 .bit = 1,
151 .prio_mask = 1,
152 },
153 [34] = {
154 .pend = IPIC_SIPNR_H,
155 .mask = IPIC_SIMSR_H,
156 .prio = IPIC_SIPRR_A,
157 .force = IPIC_SIFCR_H,
158 .bit = 2,
159 .prio_mask = 2,
160 },
161 [35] = {
162 .pend = IPIC_SIPNR_H,
163 .mask = IPIC_SIMSR_H,
164 .prio = IPIC_SIPRR_A,
165 .force = IPIC_SIFCR_H,
166 .bit = 3,
167 .prio_mask = 3,
168 },
169 [36] = {
170 .pend = IPIC_SIPNR_H,
171 .mask = IPIC_SIMSR_H,
172 .prio = IPIC_SIPRR_A,
173 .force = IPIC_SIFCR_H,
174 .bit = 4,
175 .prio_mask = 4,
176 },
177 [37] = {
178 .pend = IPIC_SIPNR_H,
179 .mask = IPIC_SIMSR_H,
180 .prio = IPIC_SIPRR_A,
181 .force = IPIC_SIFCR_H,
182 .bit = 5,
183 .prio_mask = 5,
184 },
185 [38] = {
186 .pend = IPIC_SIPNR_H,
187 .mask = IPIC_SIMSR_H,
188 .prio = IPIC_SIPRR_A,
189 .force = IPIC_SIFCR_H,
190 .bit = 6,
191 .prio_mask = 6,
192 },
193 [39] = {
194 .pend = IPIC_SIPNR_H,
195 .mask = IPIC_SIMSR_H,
196 .prio = IPIC_SIPRR_A,
197 .force = IPIC_SIFCR_H,
198 .bit = 7,
199 .prio_mask = 7,
200 },
201 [48] = {
202 .pend = IPIC_SEPNR,
203 .mask = IPIC_SEMSR,
204 .prio = IPIC_SMPRR_A,
205 .force = IPIC_SEFCR,
206 .bit = 0,
207 .prio_mask = 4,
208 },
209 [64] = {
210 .pend = IPIC_SIPNR_H,
211 .mask = IPIC_SIMSR_L,
212 .prio = IPIC_SMPRR_A,
213 .force = IPIC_SIFCR_L,
214 .bit = 0,
215 .prio_mask = 0,
216 },
217 [65] = {
218 .pend = IPIC_SIPNR_H,
219 .mask = IPIC_SIMSR_L,
220 .prio = IPIC_SMPRR_A,
221 .force = IPIC_SIFCR_L,
222 .bit = 1,
223 .prio_mask = 1,
224 },
225 [66] = {
226 .pend = IPIC_SIPNR_H,
227 .mask = IPIC_SIMSR_L,
228 .prio = IPIC_SMPRR_A,
229 .force = IPIC_SIFCR_L,
230 .bit = 2,
231 .prio_mask = 2,
232 },
233 [67] = {
234 .pend = IPIC_SIPNR_H,
235 .mask = IPIC_SIMSR_L,
236 .prio = IPIC_SMPRR_A,
237 .force = IPIC_SIFCR_L,
238 .bit = 3,
239 .prio_mask = 3,
240 },
241 [68] = {
242 .pend = IPIC_SIPNR_H,
243 .mask = IPIC_SIMSR_L,
244 .prio = IPIC_SMPRR_B,
245 .force = IPIC_SIFCR_L,
246 .bit = 4,
247 .prio_mask = 0,
248 },
249 [69] = {
250 .pend = IPIC_SIPNR_H,
251 .mask = IPIC_SIMSR_L,
252 .prio = IPIC_SMPRR_B,
253 .force = IPIC_SIFCR_L,
254 .bit = 5,
255 .prio_mask = 1,
256 },
257 [70] = {
258 .pend = IPIC_SIPNR_H,
259 .mask = IPIC_SIMSR_L,
260 .prio = IPIC_SMPRR_B,
261 .force = IPIC_SIFCR_L,
262 .bit = 6,
263 .prio_mask = 2,
264 },
265 [71] = {
266 .pend = IPIC_SIPNR_H,
267 .mask = IPIC_SIMSR_L,
268 .prio = IPIC_SMPRR_B,
269 .force = IPIC_SIFCR_L,
270 .bit = 7,
271 .prio_mask = 3,
272 },
273 [72] = {
274 .pend = IPIC_SIPNR_H,
275 .mask = IPIC_SIMSR_L,
276 .prio = 0,
277 .force = IPIC_SIFCR_L,
278 .bit = 8,
279 },
280 [73] = {
281 .pend = IPIC_SIPNR_H,
282 .mask = IPIC_SIMSR_L,
283 .prio = 0,
284 .force = IPIC_SIFCR_L,
285 .bit = 9,
286 },
287 [74] = {
288 .pend = IPIC_SIPNR_H,
289 .mask = IPIC_SIMSR_L,
290 .prio = 0,
291 .force = IPIC_SIFCR_L,
292 .bit = 10,
293 },
294 [75] = {
295 .pend = IPIC_SIPNR_H,
296 .mask = IPIC_SIMSR_L,
297 .prio = 0,
298 .force = IPIC_SIFCR_L,
299 .bit = 11,
300 },
301 [76] = {
302 .pend = IPIC_SIPNR_H,
303 .mask = IPIC_SIMSR_L,
304 .prio = 0,
305 .force = IPIC_SIFCR_L,
306 .bit = 12,
307 },
308 [77] = {
309 .pend = IPIC_SIPNR_H,
310 .mask = IPIC_SIMSR_L,
311 .prio = 0,
312 .force = IPIC_SIFCR_L,
313 .bit = 13,
314 },
315 [78] = {
316 .pend = IPIC_SIPNR_H,
317 .mask = IPIC_SIMSR_L,
318 .prio = 0,
319 .force = IPIC_SIFCR_L,
320 .bit = 14,
321 },
322 [79] = {
323 .pend = IPIC_SIPNR_H,
324 .mask = IPIC_SIMSR_L,
325 .prio = 0,
326 .force = IPIC_SIFCR_L,
327 .bit = 15,
328 },
329 [80] = {
330 .pend = IPIC_SIPNR_H,
331 .mask = IPIC_SIMSR_L,
332 .prio = 0,
333 .force = IPIC_SIFCR_L,
334 .bit = 16,
335 },
336 [84] = {
337 .pend = IPIC_SIPNR_H,
338 .mask = IPIC_SIMSR_L,
339 .prio = 0,
340 .force = IPIC_SIFCR_L,
341 .bit = 20,
342 },
343 [85] = {
344 .pend = IPIC_SIPNR_H,
345 .mask = IPIC_SIMSR_L,
346 .prio = 0,
347 .force = IPIC_SIFCR_L,
348 .bit = 21,
349 },
350 [90] = {
351 .pend = IPIC_SIPNR_H,
352 .mask = IPIC_SIMSR_L,
353 .prio = 0,
354 .force = IPIC_SIFCR_L,
355 .bit = 26,
356 },
357 [91] = {
358 .pend = IPIC_SIPNR_H,
359 .mask = IPIC_SIMSR_L,
360 .prio = 0,
361 .force = IPIC_SIFCR_L,
362 .bit = 27,
363 },
364 };
365
366 static inline u32 ipic_read(volatile u32 __iomem *base, unsigned int reg)
367 {
368 return in_be32(base + (reg >> 2));
369 }
370
371 static inline void ipic_write(volatile u32 __iomem *base, unsigned int reg, u32 value)
372 {
373 out_be32(base + (reg >> 2), value);
374 }
375
376 static inline struct ipic * ipic_from_irq(unsigned int irq)
377 {
378 return primary_ipic;
379 }
380
381 static void ipic_enable_irq(unsigned int irq)
382 {
383 struct ipic *ipic = ipic_from_irq(irq);
384 unsigned int src = irq - ipic->irq_offset;
385 u32 temp;
386
387 temp = ipic_read(ipic->regs, ipic_info[src].mask);
388 temp |= (1 << (31 - ipic_info[src].bit));
389 ipic_write(ipic->regs, ipic_info[src].mask, temp);
390 }
391
392 static void ipic_disable_irq(unsigned int irq)
393 {
394 struct ipic *ipic = ipic_from_irq(irq);
395 unsigned int src = irq - ipic->irq_offset;
396 u32 temp;
397
398 temp = ipic_read(ipic->regs, ipic_info[src].mask);
399 temp &= ~(1 << (31 - ipic_info[src].bit));
400 ipic_write(ipic->regs, ipic_info[src].mask, temp);
401 }
402
403 static void ipic_disable_irq_and_ack(unsigned int irq)
404 {
405 struct ipic *ipic = ipic_from_irq(irq);
406 unsigned int src = irq - ipic->irq_offset;
407 u32 temp;
408
409 ipic_disable_irq(irq);
410
411 temp = ipic_read(ipic->regs, ipic_info[src].pend);
412 temp |= (1 << (31 - ipic_info[src].bit));
413 ipic_write(ipic->regs, ipic_info[src].pend, temp);
414 }
415
416 static void ipic_end_irq(unsigned int irq)
417 {
418 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
419 ipic_enable_irq(irq);
420 }
421
422 struct hw_interrupt_type ipic = {
423 .typename = " IPIC ",
424 .enable = ipic_enable_irq,
425 .disable = ipic_disable_irq,
426 .ack = ipic_disable_irq_and_ack,
427 .end = ipic_end_irq,
428 };
429
430 void __init ipic_init(phys_addr_t phys_addr,
431 unsigned int flags,
432 unsigned int irq_offset,
433 unsigned char *senses,
434 unsigned int senses_count)
435 {
436 u32 i, temp = 0;
437
438 primary_ipic = &p_ipic;
439 primary_ipic->regs = ioremap(phys_addr, MPC83xx_IPIC_SIZE);
440
441 primary_ipic->irq_offset = irq_offset;
442
443 ipic_write(primary_ipic->regs, IPIC_SICNR, 0x0);
444
445 /* default priority scheme is grouped. If spread mode is required
446 * configure SICFR accordingly */
447 if (flags & IPIC_SPREADMODE_GRP_A)
448 temp |= SICFR_IPSA;
449 if (flags & IPIC_SPREADMODE_GRP_D)
450 temp |= SICFR_IPSD;
451 if (flags & IPIC_SPREADMODE_MIX_A)
452 temp |= SICFR_MPSA;
453 if (flags & IPIC_SPREADMODE_MIX_B)
454 temp |= SICFR_MPSB;
455
456 ipic_write(primary_ipic->regs, IPIC_SICNR, temp);
457
458 /* handle MCP route */
459 temp = 0;
460 if (flags & IPIC_DISABLE_MCP_OUT)
461 temp = SERCR_MCPR;
462 ipic_write(primary_ipic->regs, IPIC_SERCR, temp);
463
464 /* handle routing of IRQ0 to MCP */
465 temp = ipic_read(primary_ipic->regs, IPIC_SEMSR);
466
467 if (flags & IPIC_IRQ0_MCP)
468 temp |= SEMSR_SIRQ0;
469 else
470 temp &= ~SEMSR_SIRQ0;
471
472 ipic_write(primary_ipic->regs, IPIC_SEMSR, temp);
473
474 for (i = 0 ; i < NR_IPIC_INTS ; i++) {
475 irq_desc[i+irq_offset].handler = &ipic;
476 irq_desc[i+irq_offset].status = IRQ_LEVEL;
477 }
478
479 temp = 0;
480 for (i = 0 ; i < senses_count ; i++) {
481 if ((senses[i] & IRQ_SENSE_MASK) == IRQ_SENSE_EDGE) {
482 temp |= 1 << (16 - i);
483 if (i != 0)
484 irq_desc[i + irq_offset + MPC83xx_IRQ_EXT1 - 1].status = 0;
485 else
486 irq_desc[irq_offset + MPC83xx_IRQ_EXT0].status = 0;
487 }
488 }
489 ipic_write(primary_ipic->regs, IPIC_SECNR, temp);
490
491 printk ("IPIC (%d IRQ sources, %d External IRQs) at %p\n", NR_IPIC_INTS,
492 senses_count, primary_ipic->regs);
493 }
494
495 int ipic_set_priority(unsigned int irq, unsigned int priority)
496 {
497 struct ipic *ipic = ipic_from_irq(irq);
498 unsigned int src = irq - ipic->irq_offset;
499 u32 temp;
500
501 if (priority > 7)
502 return -EINVAL;
503 if (src > 127)
504 return -EINVAL;
505 if (ipic_info[src].prio == 0)
506 return -EINVAL;
507
508 temp = ipic_read(ipic->regs, ipic_info[src].prio);
509
510 if (priority < 4) {
511 temp &= ~(0x7 << (20 + (3 - priority) * 3));
512 temp |= ipic_info[src].prio_mask << (20 + (3 - priority) * 3);
513 } else {
514 temp &= ~(0x7 << (4 + (7 - priority) * 3));
515 temp |= ipic_info[src].prio_mask << (4 + (7 - priority) * 3);
516 }
517
518 ipic_write(ipic->regs, ipic_info[src].prio, temp);
519
520 return 0;
521 }
522
523 void ipic_set_highest_priority(unsigned int irq)
524 {
525 struct ipic *ipic = ipic_from_irq(irq);
526 unsigned int src = irq - ipic->irq_offset;
527 u32 temp;
528
529 temp = ipic_read(ipic->regs, IPIC_SICFR);
530
531 /* clear and set HPI */
532 temp &= 0x7f000000;
533 temp |= (src & 0x7f) << 24;
534
535 ipic_write(ipic->regs, IPIC_SICFR, temp);
536 }
537
538 void ipic_set_default_priority(void)
539 {
540 ipic_set_priority(MPC83xx_IRQ_TSEC1_TX, 0);
541 ipic_set_priority(MPC83xx_IRQ_TSEC1_RX, 1);
542 ipic_set_priority(MPC83xx_IRQ_TSEC1_ERROR, 2);
543 ipic_set_priority(MPC83xx_IRQ_TSEC2_TX, 3);
544 ipic_set_priority(MPC83xx_IRQ_TSEC2_RX, 4);
545 ipic_set_priority(MPC83xx_IRQ_TSEC2_ERROR, 5);
546 ipic_set_priority(MPC83xx_IRQ_USB2_DR, 6);
547 ipic_set_priority(MPC83xx_IRQ_USB2_MPH, 7);
548
549 ipic_set_priority(MPC83xx_IRQ_UART1, 0);
550 ipic_set_priority(MPC83xx_IRQ_UART2, 1);
551 ipic_set_priority(MPC83xx_IRQ_SEC2, 2);
552 ipic_set_priority(MPC83xx_IRQ_IIC1, 5);
553 ipic_set_priority(MPC83xx_IRQ_IIC2, 6);
554 ipic_set_priority(MPC83xx_IRQ_SPI, 7);
555 ipic_set_priority(MPC83xx_IRQ_RTC_SEC, 0);
556 ipic_set_priority(MPC83xx_IRQ_PIT, 1);
557 ipic_set_priority(MPC83xx_IRQ_PCI1, 2);
558 ipic_set_priority(MPC83xx_IRQ_PCI2, 3);
559 ipic_set_priority(MPC83xx_IRQ_EXT0, 4);
560 ipic_set_priority(MPC83xx_IRQ_EXT1, 5);
561 ipic_set_priority(MPC83xx_IRQ_EXT2, 6);
562 ipic_set_priority(MPC83xx_IRQ_EXT3, 7);
563 ipic_set_priority(MPC83xx_IRQ_RTC_ALR, 0);
564 ipic_set_priority(MPC83xx_IRQ_MU, 1);
565 ipic_set_priority(MPC83xx_IRQ_SBA, 2);
566 ipic_set_priority(MPC83xx_IRQ_DMA, 3);
567 ipic_set_priority(MPC83xx_IRQ_EXT4, 4);
568 ipic_set_priority(MPC83xx_IRQ_EXT5, 5);
569 ipic_set_priority(MPC83xx_IRQ_EXT6, 6);
570 ipic_set_priority(MPC83xx_IRQ_EXT7, 7);
571 }
572
573 void ipic_enable_mcp(enum ipic_mcp_irq mcp_irq)
574 {
575 struct ipic *ipic = primary_ipic;
576 u32 temp;
577
578 temp = ipic_read(ipic->regs, IPIC_SERMR);
579 temp |= (1 << (31 - mcp_irq));
580 ipic_write(ipic->regs, IPIC_SERMR, temp);
581 }
582
583 void ipic_disable_mcp(enum ipic_mcp_irq mcp_irq)
584 {
585 struct ipic *ipic = primary_ipic;
586 u32 temp;
587
588 temp = ipic_read(ipic->regs, IPIC_SERMR);
589 temp &= (1 << (31 - mcp_irq));
590 ipic_write(ipic->regs, IPIC_SERMR, temp);
591 }
592
593 u32 ipic_get_mcp_status(void)
594 {
595 return ipic_read(primary_ipic->regs, IPIC_SERMR);
596 }
597
598 void ipic_clear_mcp_status(u32 mask)
599 {
600 ipic_write(primary_ipic->regs, IPIC_SERMR, mask);
601 }
602
603 /* Return an interrupt vector or -1 if no interrupt is pending. */
604 int ipic_get_irq(struct pt_regs *regs)
605 {
606 int irq;
607
608 irq = ipic_read(primary_ipic->regs, IPIC_SIVCR) & 0x7f;
609
610 if (irq == 0) /* 0 --> no irq is pending */
611 irq = -1;
612
613 return irq;
614 }
615
616 static struct sysdev_class ipic_sysclass = {
617 set_kset_name("ipic"),
618 };
619
620 static struct sys_device device_ipic = {
621 .id = 0,
622 .cls = &ipic_sysclass,
623 };
624
625 static int __init init_ipic_sysfs(void)
626 {
627 int rc;
628
629 if (!primary_ipic->regs)
630 return -ENODEV;
631 printk(KERN_DEBUG "Registering ipic with sysfs...\n");
632
633 rc = sysdev_class_register(&ipic_sysclass);
634 if (rc) {
635 printk(KERN_ERR "Failed registering ipic sys class\n");
636 return -ENODEV;
637 }
638 rc = sysdev_register(&device_ipic);
639 if (rc) {
640 printk(KERN_ERR "Failed registering ipic sys device\n");
641 return -ENODEV;
642 }
643 return 0;
644 }
645
646 subsys_initcall(init_ipic_sysfs);
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