]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/sh/intc.c
projects / mirror_ubuntu-eoan-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
sh: Support CPU affinity masks for INTC controllers.
[mirror_ubuntu-eoan-kernel.git] / drivers / sh / intc.c
1 /*
2 * Shared interrupt handling code for IPR and INTC2 types of IRQs.
3 *
4 * Copyright (C) 2007, 2008 Magnus Damm
5 * Copyright (C) 2009, 2010 Paul Mundt
6 *
7 * Based on intc2.c and ipr.c
8 *
9 * Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi
10 * Copyright (C) 2000 Kazumoto Kojima
11 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
12 * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
13 * Copyright (C) 2005, 2006 Paul Mundt
14 *
15 * This file is subject to the terms and conditions of the GNU General Public
16 * License. See the file "COPYING" in the main directory of this archive
17 * for more details.
18 */
19 #include <linux/init.h>
20 #include <linux/irq.h>
21 #include <linux/module.h>
22 #include <linux/io.h>
23 #include <linux/interrupt.h>
24 #include <linux/sh_intc.h>
25 #include <linux/sysdev.h>
26 #include <linux/list.h>
27 #include <linux/topology.h>
28 #include <linux/bitmap.h>
29 #include <linux/cpumask.h>
30
31 #define _INTC_MK(fn, mode, addr_e, addr_d, width, shift) \
32 ((shift) | ((width) << 5) | ((fn) << 9) | ((mode) << 13) | \
33 ((addr_e) << 16) | ((addr_d << 24)))
34
35 #define _INTC_SHIFT(h) (h & 0x1f)
36 #define _INTC_WIDTH(h) ((h >> 5) & 0xf)
37 #define _INTC_FN(h) ((h >> 9) & 0xf)
38 #define _INTC_MODE(h) ((h >> 13) & 0x7)
39 #define _INTC_ADDR_E(h) ((h >> 16) & 0xff)
40 #define _INTC_ADDR_D(h) ((h >> 24) & 0xff)
41
42 struct intc_handle_int {
43 unsigned int irq;
44 unsigned long handle;
45 };
46
47 struct intc_desc_int {
48 struct list_head list;
49 struct sys_device sysdev;
50 pm_message_t state;
51 unsigned long *reg;
52 #ifdef CONFIG_SMP
53 unsigned long *smp;
54 #endif
55 unsigned int nr_reg;
56 struct intc_handle_int *prio;
57 unsigned int nr_prio;
58 struct intc_handle_int *sense;
59 unsigned int nr_sense;
60 struct irq_chip chip;
61 };
62
63 static LIST_HEAD(intc_list);
64
65 /*
66 * The intc_irq_map provides a global map of bound IRQ vectors for a
67 * given platform. Allocation of IRQs are either static through the CPU
68 * vector map, or dynamic in the case of board mux vectors or MSI.
69 *
70 * As this is a central point for all IRQ controllers on the system,
71 * each of the available sources are mapped out here. This combined with
72 * sparseirq makes it quite trivial to keep the vector map tightly packed
73 * when dynamically creating IRQs, as well as tying in to otherwise
74 * unused irq_desc positions in the sparse array.
75 */
76 static DECLARE_BITMAP(intc_irq_map, NR_IRQS);
77 static DEFINE_SPINLOCK(vector_lock);
78
79 #ifdef CONFIG_SMP
80 #define IS_SMP(x) x.smp
81 #define INTC_REG(d, x, c) (d->reg[(x)] + ((d->smp[(x)] & 0xff) * c))
82 #define SMP_NR(d, x) ((d->smp[(x)] >> 8) ? (d->smp[(x)] >> 8) : 1)
83 #else
84 #define IS_SMP(x) 0
85 #define INTC_REG(d, x, c) (d->reg[(x)])
86 #define SMP_NR(d, x) 1
87 #endif
88
89 static unsigned int intc_prio_level[NR_IRQS]; /* for now */
90 static unsigned long ack_handle[NR_IRQS];
91
92 static inline struct intc_desc_int *get_intc_desc(unsigned int irq)
93 {
94 struct irq_chip *chip = get_irq_chip(irq);
95 return container_of(chip, struct intc_desc_int, chip);
96 }
97
98 static inline unsigned int set_field(unsigned int value,
99 unsigned int field_value,
100 unsigned int handle)
101 {
102 unsigned int width = _INTC_WIDTH(handle);
103 unsigned int shift = _INTC_SHIFT(handle);
104
105 value &= ~(((1 << width) - 1) << shift);
106 value |= field_value << shift;
107 return value;
108 }
109
110 static void write_8(unsigned long addr, unsigned long h, unsigned long data)
111 {
112 __raw_writeb(set_field(0, data, h), addr);
113 (void)__raw_readb(addr); /* Defeat write posting */
114 }
115
116 static void write_16(unsigned long addr, unsigned long h, unsigned long data)
117 {
118 __raw_writew(set_field(0, data, h), addr);
119 (void)__raw_readw(addr); /* Defeat write posting */
120 }
121
122 static void write_32(unsigned long addr, unsigned long h, unsigned long data)
123 {
124 __raw_writel(set_field(0, data, h), addr);
125 (void)__raw_readl(addr); /* Defeat write posting */
126 }
127
128 static void modify_8(unsigned long addr, unsigned long h, unsigned long data)
129 {
130 unsigned long flags;
131 local_irq_save(flags);
132 __raw_writeb(set_field(__raw_readb(addr), data, h), addr);
133 (void)__raw_readb(addr); /* Defeat write posting */
134 local_irq_restore(flags);
135 }
136
137 static void modify_16(unsigned long addr, unsigned long h, unsigned long data)
138 {
139 unsigned long flags;
140 local_irq_save(flags);
141 __raw_writew(set_field(__raw_readw(addr), data, h), addr);
142 (void)__raw_readw(addr); /* Defeat write posting */
143 local_irq_restore(flags);
144 }
145
146 static void modify_32(unsigned long addr, unsigned long h, unsigned long data)
147 {
148 unsigned long flags;
149 local_irq_save(flags);
150 __raw_writel(set_field(__raw_readl(addr), data, h), addr);
151 (void)__raw_readl(addr); /* Defeat write posting */
152 local_irq_restore(flags);
153 }
154
155 enum { REG_FN_ERR = 0, REG_FN_WRITE_BASE = 1, REG_FN_MODIFY_BASE = 5 };
156
157 static void (*intc_reg_fns[])(unsigned long addr,
158 unsigned long h,
159 unsigned long data) = {
160 [REG_FN_WRITE_BASE + 0] = write_8,
161 [REG_FN_WRITE_BASE + 1] = write_16,
162 [REG_FN_WRITE_BASE + 3] = write_32,
163 [REG_FN_MODIFY_BASE + 0] = modify_8,
164 [REG_FN_MODIFY_BASE + 1] = modify_16,
165 [REG_FN_MODIFY_BASE + 3] = modify_32,
166 };
167
168 enum { MODE_ENABLE_REG = 0, /* Bit(s) set -> interrupt enabled */
169 MODE_MASK_REG, /* Bit(s) set -> interrupt disabled */
170 MODE_DUAL_REG, /* Two registers, set bit to enable / disable */
171 MODE_PRIO_REG, /* Priority value written to enable interrupt */
172 MODE_PCLR_REG, /* Above plus all bits set to disable interrupt */
173 };
174
175 static void intc_mode_field(unsigned long addr,
176 unsigned long handle,
177 void (*fn)(unsigned long,
178 unsigned long,
179 unsigned long),
180 unsigned int irq)
181 {
182 fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1));
183 }
184
185 static void intc_mode_zero(unsigned long addr,
186 unsigned long handle,
187 void (*fn)(unsigned long,
188 unsigned long,
189 unsigned long),
190 unsigned int irq)
191 {
192 fn(addr, handle, 0);
193 }
194
195 static void intc_mode_prio(unsigned long addr,
196 unsigned long handle,
197 void (*fn)(unsigned long,
198 unsigned long,
199 unsigned long),
200 unsigned int irq)
201 {
202 fn(addr, handle, intc_prio_level[irq]);
203 }
204
205 static void (*intc_enable_fns[])(unsigned long addr,
206 unsigned long handle,
207 void (*fn)(unsigned long,
208 unsigned long,
209 unsigned long),
210 unsigned int irq) = {
211 [MODE_ENABLE_REG] = intc_mode_field,
212 [MODE_MASK_REG] = intc_mode_zero,
213 [MODE_DUAL_REG] = intc_mode_field,
214 [MODE_PRIO_REG] = intc_mode_prio,
215 [MODE_PCLR_REG] = intc_mode_prio,
216 };
217
218 static void (*intc_disable_fns[])(unsigned long addr,
219 unsigned long handle,
220 void (*fn)(unsigned long,
221 unsigned long,
222 unsigned long),
223 unsigned int irq) = {
224 [MODE_ENABLE_REG] = intc_mode_zero,
225 [MODE_MASK_REG] = intc_mode_field,
226 [MODE_DUAL_REG] = intc_mode_field,
227 [MODE_PRIO_REG] = intc_mode_zero,
228 [MODE_PCLR_REG] = intc_mode_field,
229 };
230
231 static inline void _intc_enable(unsigned int irq, unsigned long handle)
232 {
233 struct intc_desc_int *d = get_intc_desc(irq);
234 unsigned long addr;
235 unsigned int cpu;
236
237 for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
238 #ifdef CONFIG_SMP
239 if (!cpumask_test_cpu(cpu, irq_to_desc(irq)->affinity))
240 continue;
241 #endif
242 addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu);
243 intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\
244 [_INTC_FN(handle)], irq);
245 }
246 }
247
248 static void intc_enable(unsigned int irq)
249 {
250 _intc_enable(irq, (unsigned long)get_irq_chip_data(irq));
251 }
252
253 static void intc_disable(unsigned int irq)
254 {
255 struct intc_desc_int *d = get_intc_desc(irq);
256 unsigned long handle = (unsigned long) get_irq_chip_data(irq);
257 unsigned long addr;
258 unsigned int cpu;
259
260 for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) {
261 #ifdef CONFIG_SMP
262 if (!cpumask_test_cpu(cpu, irq_to_desc(irq)->affinity))
263 continue;
264 #endif
265 addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu);
266 intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\
267 [_INTC_FN(handle)], irq);
268 }
269 }
270
271 static void (*intc_enable_noprio_fns[])(unsigned long addr,
272 unsigned long handle,
273 void (*fn)(unsigned long,
274 unsigned long,
275 unsigned long),
276 unsigned int irq) = {
277 [MODE_ENABLE_REG] = intc_mode_field,
278 [MODE_MASK_REG] = intc_mode_zero,
279 [MODE_DUAL_REG] = intc_mode_field,
280 [MODE_PRIO_REG] = intc_mode_field,
281 [MODE_PCLR_REG] = intc_mode_field,
282 };
283
284 static void intc_enable_disable(struct intc_desc_int *d,
285 unsigned long handle, int do_enable)
286 {
287 unsigned long addr;
288 unsigned int cpu;
289 void (*fn)(unsigned long, unsigned long,
290 void (*)(unsigned long, unsigned long, unsigned long),
291 unsigned int);
292
293 if (do_enable) {
294 for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
295 addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu);
296 fn = intc_enable_noprio_fns[_INTC_MODE(handle)];
297 fn(addr, handle, intc_reg_fns[_INTC_FN(handle)], 0);
298 }
299 } else {
300 for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) {
301 addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu);
302 fn = intc_disable_fns[_INTC_MODE(handle)];
303 fn(addr, handle, intc_reg_fns[_INTC_FN(handle)], 0);
304 }
305 }
306 }
307
308 static int intc_set_wake(unsigned int irq, unsigned int on)
309 {
310 return 0; /* allow wakeup, but setup hardware in intc_suspend() */
311 }
312
313 #ifdef CONFIG_SMP
314 /*
315 * This is held with the irq desc lock held, so we don't require any
316 * additional locking here at the intc desc level. The affinity mask is
317 * later tested in the enable/disable paths.
318 */
319 static int intc_set_affinity(unsigned int irq, const struct cpumask *cpumask)
320 {
321 if (!cpumask_intersects(cpumask, cpu_online_mask))
322 return -1;
323
324 cpumask_copy(irq_to_desc(irq)->affinity, cpumask);
325
326 return 0;
327 }
328 #endif
329
330 static void intc_mask_ack(unsigned int irq)
331 {
332 struct intc_desc_int *d = get_intc_desc(irq);
333 unsigned long handle = ack_handle[irq];
334 unsigned long addr;
335
336 intc_disable(irq);
337
338 /* read register and write zero only to the assocaited bit */
339
340 if (handle) {
341 addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);
342 switch (_INTC_FN(handle)) {
343 case REG_FN_MODIFY_BASE + 0: /* 8bit */
344 __raw_readb(addr);
345 __raw_writeb(0xff ^ set_field(0, 1, handle), addr);
346 break;
347 case REG_FN_MODIFY_BASE + 1: /* 16bit */
348 __raw_readw(addr);
349 __raw_writew(0xffff ^ set_field(0, 1, handle), addr);
350 break;
351 case REG_FN_MODIFY_BASE + 3: /* 32bit */
352 __raw_readl(addr);
353 __raw_writel(0xffffffff ^ set_field(0, 1, handle), addr);
354 break;
355 default:
356 BUG();
357 break;
358 }
359 }
360 }
361
362 static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
363 unsigned int nr_hp,
364 unsigned int irq)
365 {
366 int i;
367
368 /* this doesn't scale well, but...
369 *
370 * this function should only be used for cerain uncommon
371 * operations such as intc_set_priority() and intc_set_sense()
372 * and in those rare cases performance doesn't matter that much.
373 * keeping the memory footprint low is more important.
374 *
375 * one rather simple way to speed this up and still keep the
376 * memory footprint down is to make sure the array is sorted
377 * and then perform a bisect to lookup the irq.
378 */
379
380 for (i = 0; i < nr_hp; i++) {
381 if ((hp + i)->irq != irq)
382 continue;
383
384 return hp + i;
385 }
386
387 return NULL;
388 }
389
390 int intc_set_priority(unsigned int irq, unsigned int prio)
391 {
392 struct intc_desc_int *d = get_intc_desc(irq);
393 struct intc_handle_int *ihp;
394
395 if (!intc_prio_level[irq] || prio <= 1)
396 return -EINVAL;
397
398 ihp = intc_find_irq(d->prio, d->nr_prio, irq);
399 if (ihp) {
400 if (prio >= (1 << _INTC_WIDTH(ihp->handle)))
401 return -EINVAL;
402
403 intc_prio_level[irq] = prio;
404
405 /*
406 * only set secondary masking method directly
407 * primary masking method is using intc_prio_level[irq]
408 * priority level will be set during next enable()
409 */
410
411 if (_INTC_FN(ihp->handle) != REG_FN_ERR)
412 _intc_enable(irq, ihp->handle);
413 }
414 return 0;
415 }
416
417 #define VALID(x) (x | 0x80)
418
419 static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
420 [IRQ_TYPE_EDGE_FALLING] = VALID(0),
421 [IRQ_TYPE_EDGE_RISING] = VALID(1),
422 [IRQ_TYPE_LEVEL_LOW] = VALID(2),
423 /* SH7706, SH7707 and SH7709 do not support high level triggered */
424 #if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \
425 !defined(CONFIG_CPU_SUBTYPE_SH7707) && \
426 !defined(CONFIG_CPU_SUBTYPE_SH7709)
427 [IRQ_TYPE_LEVEL_HIGH] = VALID(3),
428 #endif
429 };
430
431 static int intc_set_sense(unsigned int irq, unsigned int type)
432 {
433 struct intc_desc_int *d = get_intc_desc(irq);
434 unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK];
435 struct intc_handle_int *ihp;
436 unsigned long addr;
437
438 if (!value)
439 return -EINVAL;
440
441 ihp = intc_find_irq(d->sense, d->nr_sense, irq);
442 if (ihp) {
443 addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0);
444 intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle, value);
445 }
446 return 0;
447 }
448
449 static unsigned int __init intc_get_reg(struct intc_desc_int *d,
450 unsigned long address)
451 {
452 unsigned int k;
453
454 for (k = 0; k < d->nr_reg; k++) {
455 if (d->reg[k] == address)
456 return k;
457 }
458
459 BUG();
460 return 0;
461 }
462
463 static intc_enum __init intc_grp_id(struct intc_desc *desc,
464 intc_enum enum_id)
465 {
466 struct intc_group *g = desc->hw.groups;
467 unsigned int i, j;
468
469 for (i = 0; g && enum_id && i < desc->hw.nr_groups; i++) {
470 g = desc->hw.groups + i;
471
472 for (j = 0; g->enum_ids[j]; j++) {
473 if (g->enum_ids[j] != enum_id)
474 continue;
475
476 return g->enum_id;
477 }
478 }
479
480 return 0;
481 }
482
483 static unsigned int __init _intc_mask_data(struct intc_desc *desc,
484 struct intc_desc_int *d,
485 intc_enum enum_id,
486 unsigned int *reg_idx,
487 unsigned int *fld_idx)
488 {
489 struct intc_mask_reg *mr = desc->hw.mask_regs;
490 unsigned int fn, mode;
491 unsigned long reg_e, reg_d;
492
493 while (mr && enum_id && *reg_idx < desc->hw.nr_mask_regs) {
494 mr = desc->hw.mask_regs + *reg_idx;
495
496 for (; *fld_idx < ARRAY_SIZE(mr->enum_ids); (*fld_idx)++) {
497 if (mr->enum_ids[*fld_idx] != enum_id)
498 continue;
499
500 if (mr->set_reg && mr->clr_reg) {
501 fn = REG_FN_WRITE_BASE;
502 mode = MODE_DUAL_REG;
503 reg_e = mr->clr_reg;
504 reg_d = mr->set_reg;
505 } else {
506 fn = REG_FN_MODIFY_BASE;
507 if (mr->set_reg) {
508 mode = MODE_ENABLE_REG;
509 reg_e = mr->set_reg;
510 reg_d = mr->set_reg;
511 } else {
512 mode = MODE_MASK_REG;
513 reg_e = mr->clr_reg;
514 reg_d = mr->clr_reg;
515 }
516 }
517
518 fn += (mr->reg_width >> 3) - 1;
519 return _INTC_MK(fn, mode,
520 intc_get_reg(d, reg_e),
521 intc_get_reg(d, reg_d),
522 1,
523 (mr->reg_width - 1) - *fld_idx);
524 }
525
526 *fld_idx = 0;
527 (*reg_idx)++;
528 }
529
530 return 0;
531 }
532
533 static unsigned int __init intc_mask_data(struct intc_desc *desc,
534 struct intc_desc_int *d,
535 intc_enum enum_id, int do_grps)
536 {
537 unsigned int i = 0;
538 unsigned int j = 0;
539 unsigned int ret;
540
541 ret = _intc_mask_data(desc, d, enum_id, &i, &j);
542 if (ret)
543 return ret;
544
545 if (do_grps)
546 return intc_mask_data(desc, d, intc_grp_id(desc, enum_id), 0);
547
548 return 0;
549 }
550
551 static unsigned int __init _intc_prio_data(struct intc_desc *desc,
552 struct intc_desc_int *d,
553 intc_enum enum_id,
554 unsigned int *reg_idx,
555 unsigned int *fld_idx)
556 {
557 struct intc_prio_reg *pr = desc->hw.prio_regs;
558 unsigned int fn, n, mode, bit;
559 unsigned long reg_e, reg_d;
560
561 while (pr && enum_id && *reg_idx < desc->hw.nr_prio_regs) {
562 pr = desc->hw.prio_regs + *reg_idx;
563
564 for (; *fld_idx < ARRAY_SIZE(pr->enum_ids); (*fld_idx)++) {
565 if (pr->enum_ids[*fld_idx] != enum_id)
566 continue;
567
568 if (pr->set_reg && pr->clr_reg) {
569 fn = REG_FN_WRITE_BASE;
570 mode = MODE_PCLR_REG;
571 reg_e = pr->set_reg;
572 reg_d = pr->clr_reg;
573 } else {
574 fn = REG_FN_MODIFY_BASE;
575 mode = MODE_PRIO_REG;
576 if (!pr->set_reg)
577 BUG();
578 reg_e = pr->set_reg;
579 reg_d = pr->set_reg;
580 }
581
582 fn += (pr->reg_width >> 3) - 1;
583 n = *fld_idx + 1;
584
585 BUG_ON(n * pr->field_width > pr->reg_width);
586
587 bit = pr->reg_width - (n * pr->field_width);
588
589 return _INTC_MK(fn, mode,
590 intc_get_reg(d, reg_e),
591 intc_get_reg(d, reg_d),
592 pr->field_width, bit);
593 }
594
595 *fld_idx = 0;
596 (*reg_idx)++;
597 }
598
599 return 0;
600 }
601
602 static unsigned int __init intc_prio_data(struct intc_desc *desc,
603 struct intc_desc_int *d,
604 intc_enum enum_id, int do_grps)
605 {
606 unsigned int i = 0;
607 unsigned int j = 0;
608 unsigned int ret;
609
610 ret = _intc_prio_data(desc, d, enum_id, &i, &j);
611 if (ret)
612 return ret;
613
614 if (do_grps)
615 return intc_prio_data(desc, d, intc_grp_id(desc, enum_id), 0);
616
617 return 0;
618 }
619
620 static void __init intc_enable_disable_enum(struct intc_desc *desc,
621 struct intc_desc_int *d,
622 intc_enum enum_id, int enable)
623 {
624 unsigned int i, j, data;
625
626 /* go through and enable/disable all mask bits */
627 i = j = 0;
628 do {
629 data = _intc_mask_data(desc, d, enum_id, &i, &j);
630 if (data)
631 intc_enable_disable(d, data, enable);
632 j++;
633 } while (data);
634
635 /* go through and enable/disable all priority fields */
636 i = j = 0;
637 do {
638 data = _intc_prio_data(desc, d, enum_id, &i, &j);
639 if (data)
640 intc_enable_disable(d, data, enable);
641
642 j++;
643 } while (data);
644 }
645
646 static unsigned int __init intc_ack_data(struct intc_desc *desc,
647 struct intc_desc_int *d,
648 intc_enum enum_id)
649 {
650 struct intc_mask_reg *mr = desc->hw.ack_regs;
651 unsigned int i, j, fn, mode;
652 unsigned long reg_e, reg_d;
653
654 for (i = 0; mr && enum_id && i < desc->hw.nr_ack_regs; i++) {
655 mr = desc->hw.ack_regs + i;
656
657 for (j = 0; j < ARRAY_SIZE(mr->enum_ids); j++) {
658 if (mr->enum_ids[j] != enum_id)
659 continue;
660
661 fn = REG_FN_MODIFY_BASE;
662 mode = MODE_ENABLE_REG;
663 reg_e = mr->set_reg;
664 reg_d = mr->set_reg;
665
666 fn += (mr->reg_width >> 3) - 1;
667 return _INTC_MK(fn, mode,
668 intc_get_reg(d, reg_e),
669 intc_get_reg(d, reg_d),
670 1,
671 (mr->reg_width - 1) - j);
672 }
673 }
674
675 return 0;
676 }
677
678 static unsigned int __init intc_sense_data(struct intc_desc *desc,
679 struct intc_desc_int *d,
680 intc_enum enum_id)
681 {
682 struct intc_sense_reg *sr = desc->hw.sense_regs;
683 unsigned int i, j, fn, bit;
684
685 for (i = 0; sr && enum_id && i < desc->hw.nr_sense_regs; i++) {
686 sr = desc->hw.sense_regs + i;
687
688 for (j = 0; j < ARRAY_SIZE(sr->enum_ids); j++) {
689 if (sr->enum_ids[j] != enum_id)
690 continue;
691
692 fn = REG_FN_MODIFY_BASE;
693 fn += (sr->reg_width >> 3) - 1;
694
695 BUG_ON((j + 1) * sr->field_width > sr->reg_width);
696
697 bit = sr->reg_width - ((j + 1) * sr->field_width);
698
699 return _INTC_MK(fn, 0, intc_get_reg(d, sr->reg),
700 0, sr->field_width, bit);
701 }
702 }
703
704 return 0;
705 }
706
707 static void __init intc_register_irq(struct intc_desc *desc,
708 struct intc_desc_int *d,
709 intc_enum enum_id,
710 unsigned int irq)
711 {
712 struct intc_handle_int *hp;
713 unsigned int data[2], primary;
714
715 /*
716 * Register the IRQ position with the global IRQ map
717 */
718 set_bit(irq, intc_irq_map);
719
720 /* Prefer single interrupt source bitmap over other combinations:
721 * 1. bitmap, single interrupt source
722 * 2. priority, single interrupt source
723 * 3. bitmap, multiple interrupt sources (groups)
724 * 4. priority, multiple interrupt sources (groups)
725 */
726
727 data[0] = intc_mask_data(desc, d, enum_id, 0);
728 data[1] = intc_prio_data(desc, d, enum_id, 0);
729
730 primary = 0;
731 if (!data[0] && data[1])
732 primary = 1;
733
734 if (!data[0] && !data[1])
735 pr_warning("intc: missing unique irq mask for "
736 "irq %d (vect 0x%04x)\n", irq, irq2evt(irq));
737
738 data[0] = data[0] ? data[0] : intc_mask_data(desc, d, enum_id, 1);
739 data[1] = data[1] ? data[1] : intc_prio_data(desc, d, enum_id, 1);
740
741 if (!data[primary])
742 primary ^= 1;
743
744 BUG_ON(!data[primary]); /* must have primary masking method */
745
746 disable_irq_nosync(irq);
747 set_irq_chip_and_handler_name(irq, &d->chip,
748 handle_level_irq, "level");
749 set_irq_chip_data(irq, (void *)data[primary]);
750
751 /* set priority level
752 * - this needs to be at least 2 for 5-bit priorities on 7780
753 */
754 intc_prio_level[irq] = 2;
755
756 /* enable secondary masking method if present */
757 if (data[!primary])
758 _intc_enable(irq, data[!primary]);
759
760 /* add irq to d->prio list if priority is available */
761 if (data[1]) {
762 hp = d->prio + d->nr_prio;
763 hp->irq = irq;
764 hp->handle = data[1];
765
766 if (primary) {
767 /*
768 * only secondary priority should access registers, so
769 * set _INTC_FN(h) = REG_FN_ERR for intc_set_priority()
770 */
771
772 hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0);
773 hp->handle |= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0);
774 }
775 d->nr_prio++;
776 }
777
778 /* add irq to d->sense list if sense is available */
779 data[0] = intc_sense_data(desc, d, enum_id);
780 if (data[0]) {
781 (d->sense + d->nr_sense)->irq = irq;
782 (d->sense + d->nr_sense)->handle = data[0];
783 d->nr_sense++;
784 }
785
786 /* irq should be disabled by default */
787 d->chip.mask(irq);
788
789 if (desc->hw.ack_regs)
790 ack_handle[irq] = intc_ack_data(desc, d, enum_id);
791 }
792
793 static unsigned int __init save_reg(struct intc_desc_int *d,
794 unsigned int cnt,
795 unsigned long value,
796 unsigned int smp)
797 {
798 if (value) {
799 d->reg[cnt] = value;
800 #ifdef CONFIG_SMP
801 d->smp[cnt] = smp;
802 #endif
803 return 1;
804 }
805
806 return 0;
807 }
808
809 static void intc_redirect_irq(unsigned int irq, struct irq_desc *desc)
810 {
811 generic_handle_irq((unsigned int)get_irq_data(irq));
812 }
813
814 void __init register_intc_controller(struct intc_desc *desc)
815 {
816 unsigned int i, k, smp;
817 struct intc_hw_desc *hw = &desc->hw;
818 struct intc_desc_int *d;
819
820 d = kzalloc(sizeof(*d), GFP_NOWAIT);
821
822 INIT_LIST_HEAD(&d->list);
823 list_add(&d->list, &intc_list);
824
825 d->nr_reg = hw->mask_regs ? hw->nr_mask_regs * 2 : 0;
826 d->nr_reg += hw->prio_regs ? hw->nr_prio_regs * 2 : 0;
827 d->nr_reg += hw->sense_regs ? hw->nr_sense_regs : 0;
828 d->nr_reg += hw->ack_regs ? hw->nr_ack_regs : 0;
829
830 d->reg = kzalloc(d->nr_reg * sizeof(*d->reg), GFP_NOWAIT);
831 #ifdef CONFIG_SMP
832 d->smp = kzalloc(d->nr_reg * sizeof(*d->smp), GFP_NOWAIT);
833 #endif
834 k = 0;
835
836 if (hw->mask_regs) {
837 for (i = 0; i < hw->nr_mask_regs; i++) {
838 smp = IS_SMP(hw->mask_regs[i]);
839 k += save_reg(d, k, hw->mask_regs[i].set_reg, smp);
840 k += save_reg(d, k, hw->mask_regs[i].clr_reg, smp);
841 }
842 }
843
844 if (hw->prio_regs) {
845 d->prio = kzalloc(hw->nr_vectors * sizeof(*d->prio),
846 GFP_NOWAIT);
847
848 for (i = 0; i < hw->nr_prio_regs; i++) {
849 smp = IS_SMP(hw->prio_regs[i]);
850 k += save_reg(d, k, hw->prio_regs[i].set_reg, smp);
851 k += save_reg(d, k, hw->prio_regs[i].clr_reg, smp);
852 }
853 }
854
855 if (hw->sense_regs) {
856 d->sense = kzalloc(hw->nr_vectors * sizeof(*d->sense),
857 GFP_NOWAIT);
858
859 for (i = 0; i < hw->nr_sense_regs; i++)
860 k += save_reg(d, k, hw->sense_regs[i].reg, 0);
861 }
862
863 d->chip.name = desc->name;
864 d->chip.mask = intc_disable;
865 d->chip.unmask = intc_enable;
866 d->chip.mask_ack = intc_disable;
867 d->chip.enable = intc_enable;
868 d->chip.disable = intc_disable;
869 d->chip.shutdown = intc_disable;
870 d->chip.set_type = intc_set_sense;
871 d->chip.set_wake = intc_set_wake;
872 #ifdef CONFIG_SMP
873 d->chip.set_affinity = intc_set_affinity;
874 #endif
875
876 if (hw->ack_regs) {
877 for (i = 0; i < hw->nr_ack_regs; i++)
878 k += save_reg(d, k, hw->ack_regs[i].set_reg, 0);
879
880 d->chip.mask_ack = intc_mask_ack;
881 }
882
883 /* disable bits matching force_disable before registering irqs */
884 if (desc->force_disable)
885 intc_enable_disable_enum(desc, d, desc->force_disable, 0);
886
887 /* disable bits matching force_enable before registering irqs */
888 if (desc->force_enable)
889 intc_enable_disable_enum(desc, d, desc->force_enable, 0);
890
891 BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */
892
893 /* register the vectors one by one */
894 for (i = 0; i < hw->nr_vectors; i++) {
895 struct intc_vect *vect = hw->vectors + i;
896 unsigned int irq = evt2irq(vect->vect);
897 struct irq_desc *irq_desc;
898
899 if (!vect->enum_id)
900 continue;
901
902 irq_desc = irq_to_desc_alloc_node(irq, numa_node_id());
903 if (unlikely(!irq_desc)) {
904 pr_info("can't get irq_desc for %d\n", irq);
905 continue;
906 }
907
908 intc_register_irq(desc, d, vect->enum_id, irq);
909
910 for (k = i + 1; k < hw->nr_vectors; k++) {
911 struct intc_vect *vect2 = hw->vectors + k;
912 unsigned int irq2 = evt2irq(vect2->vect);
913
914 if (vect->enum_id != vect2->enum_id)
915 continue;
916
917 /*
918 * In the case of multi-evt handling and sparse
919 * IRQ support, each vector still needs to have
920 * its own backing irq_desc.
921 */
922 irq_desc = irq_to_desc_alloc_node(irq2, numa_node_id());
923 if (unlikely(!irq_desc)) {
924 pr_info("can't get irq_desc for %d\n", irq2);
925 continue;
926 }
927
928 vect2->enum_id = 0;
929
930 /* redirect this interrupts to the first one */
931 set_irq_chip(irq2, &dummy_irq_chip);
932 set_irq_chained_handler(irq2, intc_redirect_irq);
933 set_irq_data(irq2, (void *)irq);
934 }
935 }
936
937 /* enable bits matching force_enable after registering irqs */
938 if (desc->force_enable)
939 intc_enable_disable_enum(desc, d, desc->force_enable, 1);
940 }
941
942 static int intc_suspend(struct sys_device *dev, pm_message_t state)
943 {
944 struct intc_desc_int *d;
945 struct irq_desc *desc;
946 int irq;
947
948 /* get intc controller associated with this sysdev */
949 d = container_of(dev, struct intc_desc_int, sysdev);
950
951 switch (state.event) {
952 case PM_EVENT_ON:
953 if (d->state.event != PM_EVENT_FREEZE)
954 break;
955 for_each_irq_desc(irq, desc) {
956 if (desc->handle_irq == intc_redirect_irq)
957 continue;
958 if (desc->chip != &d->chip)
959 continue;
960 if (desc->status & IRQ_DISABLED)
961 intc_disable(irq);
962 else
963 intc_enable(irq);
964 }
965 break;
966 case PM_EVENT_FREEZE:
967 /* nothing has to be done */
968 break;
969 case PM_EVENT_SUSPEND:
970 /* enable wakeup irqs belonging to this intc controller */
971 for_each_irq_desc(irq, desc) {
972 if ((desc->status & IRQ_WAKEUP) && (desc->chip == &d->chip))
973 intc_enable(irq);
974 }
975 break;
976 }
977 d->state = state;
978
979 return 0;
980 }
981
982 static int intc_resume(struct sys_device *dev)
983 {
984 return intc_suspend(dev, PMSG_ON);
985 }
986
987 static struct sysdev_class intc_sysdev_class = {
988 .name = "intc",
989 .suspend = intc_suspend,
990 .resume = intc_resume,
991 };
992
993 /* register this intc as sysdev to allow suspend/resume */
994 static int __init register_intc_sysdevs(void)
995 {
996 struct intc_desc_int *d;
997 int error;
998 int id = 0;
999
1000 error = sysdev_class_register(&intc_sysdev_class);
1001 if (!error) {
1002 list_for_each_entry(d, &intc_list, list) {
1003 d->sysdev.id = id;
1004 d->sysdev.cls = &intc_sysdev_class;
1005 error = sysdev_register(&d->sysdev);
1006 if (error)
1007 break;
1008 id++;
1009 }
1010 }
1011
1012 if (error)
1013 pr_warning("intc: sysdev registration error\n");
1014
1015 return error;
1016 }
1017 device_initcall(register_intc_sysdevs);
1018
1019 /*
1020 * Dynamic IRQ allocation and deallocation
1021 */
1022 unsigned int create_irq_nr(unsigned int irq_want, int node)
1023 {
1024 unsigned int irq = 0, new;
1025 unsigned long flags;
1026 struct irq_desc *desc;
1027
1028 spin_lock_irqsave(&vector_lock, flags);
1029
1030 /*
1031 * First try the wanted IRQ
1032 */
1033 if (test_and_set_bit(irq_want, intc_irq_map) == 0) {
1034 new = irq_want;
1035 } else {
1036 /* .. then fall back to scanning. */
1037 new = find_first_zero_bit(intc_irq_map, nr_irqs);
1038 if (unlikely(new == nr_irqs))
1039 goto out_unlock;
1040
1041 __set_bit(new, intc_irq_map);
1042 }
1043
1044 desc = irq_to_desc_alloc_node(new, node);
1045 if (unlikely(!desc)) {
1046 pr_info("can't get irq_desc for %d\n", new);
1047 goto out_unlock;
1048 }
1049
1050 desc = move_irq_desc(desc, node);
1051 irq = new;
1052
1053 out_unlock:
1054 spin_unlock_irqrestore(&vector_lock, flags);
1055
1056 if (irq > 0)
1057 dynamic_irq_init(irq);
1058
1059 return irq;
1060 }
1061
1062 int create_irq(void)
1063 {
1064 int nid = cpu_to_node(smp_processor_id());
1065 int irq;
1066
1067 irq = create_irq_nr(NR_IRQS_LEGACY, nid);
1068 if (irq == 0)
1069 irq = -1;
1070
1071 return irq;
1072 }
1073
1074 void destroy_irq(unsigned int irq)
1075 {
1076 unsigned long flags;
1077
1078 dynamic_irq_cleanup(irq);
1079
1080 spin_lock_irqsave(&vector_lock, flags);
1081 __clear_bit(irq, intc_irq_map);
1082 spin_unlock_irqrestore(&vector_lock, flags);
1083 }
1084
1085 int reserve_irq_vector(unsigned int irq)
1086 {
1087 unsigned long flags;
1088 int ret = 0;
1089
1090 spin_lock_irqsave(&vector_lock, flags);
1091 if (test_and_set_bit(irq, intc_irq_map))
1092 ret = -EBUSY;
1093 spin_unlock_irqrestore(&vector_lock, flags);
1094
1095 return ret;
1096 }
1097
1098 void reserve_irq_legacy(void)
1099 {
1100 unsigned long flags;
1101 int i, j;
1102
1103 spin_lock_irqsave(&vector_lock, flags);
1104 j = find_first_bit(intc_irq_map, nr_irqs);
1105 for (i = 0; i < j; i++)
1106 __set_bit(i, intc_irq_map);
1107 spin_unlock_irqrestore(&vector_lock, flags);
1108 }
Ubuntu Eoan Linux kernel mirror