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Linux 4.1.18
[linux/fpc-iii.git] / arch / mips / bcm63xx / irq.c
blobe3e808a6c54261841638e975ae8518aaee1fa2f0
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 * Copyright (C) 2008 Nicolas Schichan <nschichan@freebox.fr>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/module.h>
14 #include <linux/irq.h>
15 #include <linux/spinlock.h>
16 #include <asm/irq_cpu.h>
17 #include <asm/mipsregs.h>
18 #include <bcm63xx_cpu.h>
19 #include <bcm63xx_regs.h>
20 #include <bcm63xx_io.h>
21 #include <bcm63xx_irq.h>
22
23
24 static DEFINE_SPINLOCK(ipic_lock);
25 static DEFINE_SPINLOCK(epic_lock);
26
27 static u32 irq_stat_addr[2];
28 static u32 irq_mask_addr[2];
29 static void (*dispatch_internal)(int cpu);
30 static int is_ext_irq_cascaded;
31 static unsigned int ext_irq_count;
32 static unsigned int ext_irq_start, ext_irq_end;
33 static unsigned int ext_irq_cfg_reg1, ext_irq_cfg_reg2;
34 static void (*internal_irq_mask)(struct irq_data *d);
35 static void (*internal_irq_unmask)(struct irq_data *d, const struct cpumask *m);
36
37
38 static inline u32 get_ext_irq_perf_reg(int irq)
39 {
40 if (irq < 4)
41 return ext_irq_cfg_reg1;
42 return ext_irq_cfg_reg2;
43 }
44
45 static inline void handle_internal(int intbit)
46 {
47 if (is_ext_irq_cascaded &&
48 intbit >= ext_irq_start && intbit <= ext_irq_end)
49 do_IRQ(intbit - ext_irq_start + IRQ_EXTERNAL_BASE);
50 else
51 do_IRQ(intbit + IRQ_INTERNAL_BASE);
52 }
53
54 static inline int enable_irq_for_cpu(int cpu, struct irq_data *d,
55 const struct cpumask *m)
56 {
57 bool enable = cpu_online(cpu);
58
59 #ifdef CONFIG_SMP
60 if (m)
61 enable &= cpumask_test_cpu(cpu, m);
62 else if (irqd_affinity_was_set(d))
63 enable &= cpumask_test_cpu(cpu, d->affinity);
64 #endif
65 return enable;
66 }
67
68 /*
69 * dispatch internal devices IRQ (uart, enet, watchdog, ...). do not
70 * prioritize any interrupt relatively to another. the static counter
71 * will resume the loop where it ended the last time we left this
72 * function.
73 */
74
75 #define BUILD_IPIC_INTERNAL(width) \
76 void __dispatch_internal_##width(int cpu) \
77 { \
78 u32 pending[width / 32]; \
79 unsigned int src, tgt; \
80 bool irqs_pending = false; \
81 static unsigned int i[2]; \
82 unsigned int *next = &i[cpu]; \
83 unsigned long flags; \
84 \
85 /* read registers in reverse order */ \
86 spin_lock_irqsave(&ipic_lock, flags); \
87 for (src = 0, tgt = (width / 32); src < (width / 32); src++) { \
88 u32 val; \
89 \
90 val = bcm_readl(irq_stat_addr[cpu] + src * sizeof(u32)); \
91 val &= bcm_readl(irq_mask_addr[cpu] + src * sizeof(u32)); \
92 pending[--tgt] = val; \
93 \
94 if (val) \
95 irqs_pending = true; \
96 } \
97 spin_unlock_irqrestore(&ipic_lock, flags); \
98 \
99 if (!irqs_pending) \
100 return; \
101 \
102 while (1) { \
103 unsigned int to_call = *next; \
104 \
105 *next = (*next + 1) & (width - 1); \
106 if (pending[to_call / 32] & (1 << (to_call & 0x1f))) { \
107 handle_internal(to_call); \
108 break; \
109 } \
110 } \
111 } \
112 \
113 static void __internal_irq_mask_##width(struct irq_data *d) \
114 { \
115 u32 val; \
116 unsigned irq = d->irq - IRQ_INTERNAL_BASE; \
117 unsigned reg = (irq / 32) ^ (width/32 - 1); \
118 unsigned bit = irq & 0x1f; \
119 unsigned long flags; \
120 int cpu; \
121 \
122 spin_lock_irqsave(&ipic_lock, flags); \
123 for_each_present_cpu(cpu) { \
124 if (!irq_mask_addr[cpu]) \
125 break; \
126 \
127 val = bcm_readl(irq_mask_addr[cpu] + reg * sizeof(u32));\
128 val &= ~(1 << bit); \
129 bcm_writel(val, irq_mask_addr[cpu] + reg * sizeof(u32));\
130 } \
131 spin_unlock_irqrestore(&ipic_lock, flags); \
132 } \
133 \
134 static void __internal_irq_unmask_##width(struct irq_data *d, \
135 const struct cpumask *m) \
136 { \
137 u32 val; \
138 unsigned irq = d->irq - IRQ_INTERNAL_BASE; \
139 unsigned reg = (irq / 32) ^ (width/32 - 1); \
140 unsigned bit = irq & 0x1f; \
141 unsigned long flags; \
142 int cpu; \
143 \
144 spin_lock_irqsave(&ipic_lock, flags); \
145 for_each_present_cpu(cpu) { \
146 if (!irq_mask_addr[cpu]) \
147 break; \
148 \
149 val = bcm_readl(irq_mask_addr[cpu] + reg * sizeof(u32));\
150 if (enable_irq_for_cpu(cpu, d, m)) \
151 val |= (1 << bit); \
152 else \
153 val &= ~(1 << bit); \
154 bcm_writel(val, irq_mask_addr[cpu] + reg * sizeof(u32));\
155 } \
156 spin_unlock_irqrestore(&ipic_lock, flags); \
157 }
158
159 BUILD_IPIC_INTERNAL(32);
160 BUILD_IPIC_INTERNAL(64);
161
162 asmlinkage void plat_irq_dispatch(void)
163 {
164 u32 cause;
165
166 do {
167 cause = read_c0_cause() & read_c0_status() & ST0_IM;
168
169 if (!cause)
170 break;
171
172 if (cause & CAUSEF_IP7)
173 do_IRQ(7);
174 if (cause & CAUSEF_IP0)
175 do_IRQ(0);
176 if (cause & CAUSEF_IP1)
177 do_IRQ(1);
178 if (cause & CAUSEF_IP2)
179 dispatch_internal(0);
180 if (is_ext_irq_cascaded) {
181 if (cause & CAUSEF_IP3)
182 dispatch_internal(1);
183 } else {
184 if (cause & CAUSEF_IP3)
185 do_IRQ(IRQ_EXT_0);
186 if (cause & CAUSEF_IP4)
187 do_IRQ(IRQ_EXT_1);
188 if (cause & CAUSEF_IP5)
189 do_IRQ(IRQ_EXT_2);
190 if (cause & CAUSEF_IP6)
191 do_IRQ(IRQ_EXT_3);
192 }
193 } while (1);
194 }
195
196 /*
197 * internal IRQs operations: only mask/unmask on PERF irq mask
198 * register.
199 */
200 static void bcm63xx_internal_irq_mask(struct irq_data *d)
201 {
202 internal_irq_mask(d);
203 }
204
205 static void bcm63xx_internal_irq_unmask(struct irq_data *d)
206 {
207 internal_irq_unmask(d, NULL);
208 }
209
210 /*
211 * external IRQs operations: mask/unmask and clear on PERF external
212 * irq control register.
213 */
214 static void bcm63xx_external_irq_mask(struct irq_data *d)
215 {
216 unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
217 u32 reg, regaddr;
218 unsigned long flags;
219
220 regaddr = get_ext_irq_perf_reg(irq);
221 spin_lock_irqsave(&epic_lock, flags);
222 reg = bcm_perf_readl(regaddr);
223
224 if (BCMCPU_IS_6348())
225 reg &= ~EXTIRQ_CFG_MASK_6348(irq % 4);
226 else
227 reg &= ~EXTIRQ_CFG_MASK(irq % 4);
228
229 bcm_perf_writel(reg, regaddr);
230 spin_unlock_irqrestore(&epic_lock, flags);
231
232 if (is_ext_irq_cascaded)
233 internal_irq_mask(irq_get_irq_data(irq + ext_irq_start));
234 }
235
236 static void bcm63xx_external_irq_unmask(struct irq_data *d)
237 {
238 unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
239 u32 reg, regaddr;
240 unsigned long flags;
241
242 regaddr = get_ext_irq_perf_reg(irq);
243 spin_lock_irqsave(&epic_lock, flags);
244 reg = bcm_perf_readl(regaddr);
245
246 if (BCMCPU_IS_6348())
247 reg |= EXTIRQ_CFG_MASK_6348(irq % 4);
248 else
249 reg |= EXTIRQ_CFG_MASK(irq % 4);
250
251 bcm_perf_writel(reg, regaddr);
252 spin_unlock_irqrestore(&epic_lock, flags);
253
254 if (is_ext_irq_cascaded)
255 internal_irq_unmask(irq_get_irq_data(irq + ext_irq_start),
256 NULL);
257 }
258
259 static void bcm63xx_external_irq_clear(struct irq_data *d)
260 {
261 unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
262 u32 reg, regaddr;
263 unsigned long flags;
264
265 regaddr = get_ext_irq_perf_reg(irq);
266 spin_lock_irqsave(&epic_lock, flags);
267 reg = bcm_perf_readl(regaddr);
268
269 if (BCMCPU_IS_6348())
270 reg |= EXTIRQ_CFG_CLEAR_6348(irq % 4);
271 else
272 reg |= EXTIRQ_CFG_CLEAR(irq % 4);
273
274 bcm_perf_writel(reg, regaddr);
275 spin_unlock_irqrestore(&epic_lock, flags);
276 }
277
278 static int bcm63xx_external_irq_set_type(struct irq_data *d,
279 unsigned int flow_type)
280 {
281 unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
282 u32 reg, regaddr;
283 int levelsense, sense, bothedge;
284 unsigned long flags;
285
286 flow_type &= IRQ_TYPE_SENSE_MASK;
287
288 if (flow_type == IRQ_TYPE_NONE)
289 flow_type = IRQ_TYPE_LEVEL_LOW;
290
291 levelsense = sense = bothedge = 0;
292 switch (flow_type) {
293 case IRQ_TYPE_EDGE_BOTH:
294 bothedge = 1;
295 break;
296
297 case IRQ_TYPE_EDGE_RISING:
298 sense = 1;
299 break;
300
301 case IRQ_TYPE_EDGE_FALLING:
302 break;
303
304 case IRQ_TYPE_LEVEL_HIGH:
305 levelsense = 1;
306 sense = 1;
307 break;
308
309 case IRQ_TYPE_LEVEL_LOW:
310 levelsense = 1;
311 break;
312
313 default:
314 printk(KERN_ERR "bogus flow type combination given !\n");
315 return -EINVAL;
316 }
317
318 regaddr = get_ext_irq_perf_reg(irq);
319 spin_lock_irqsave(&epic_lock, flags);
320 reg = bcm_perf_readl(regaddr);
321 irq %= 4;
322
323 switch (bcm63xx_get_cpu_id()) {
324 case BCM6348_CPU_ID:
325 if (levelsense)
326 reg |= EXTIRQ_CFG_LEVELSENSE_6348(irq);
327 else
328 reg &= ~EXTIRQ_CFG_LEVELSENSE_6348(irq);
329 if (sense)
330 reg |= EXTIRQ_CFG_SENSE_6348(irq);
331 else
332 reg &= ~EXTIRQ_CFG_SENSE_6348(irq);
333 if (bothedge)
334 reg |= EXTIRQ_CFG_BOTHEDGE_6348(irq);
335 else
336 reg &= ~EXTIRQ_CFG_BOTHEDGE_6348(irq);
337 break;
338
339 case BCM3368_CPU_ID:
340 case BCM6328_CPU_ID:
341 case BCM6338_CPU_ID:
342 case BCM6345_CPU_ID:
343 case BCM6358_CPU_ID:
344 case BCM6362_CPU_ID:
345 case BCM6368_CPU_ID:
346 if (levelsense)
347 reg |= EXTIRQ_CFG_LEVELSENSE(irq);
348 else
349 reg &= ~EXTIRQ_CFG_LEVELSENSE(irq);
350 if (sense)
351 reg |= EXTIRQ_CFG_SENSE(irq);
352 else
353 reg &= ~EXTIRQ_CFG_SENSE(irq);
354 if (bothedge)
355 reg |= EXTIRQ_CFG_BOTHEDGE(irq);
356 else
357 reg &= ~EXTIRQ_CFG_BOTHEDGE(irq);
358 break;
359 default:
360 BUG();
361 }
362
363 bcm_perf_writel(reg, regaddr);
364 spin_unlock_irqrestore(&epic_lock, flags);
365
366 irqd_set_trigger_type(d, flow_type);
367 if (flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
368 __irq_set_handler_locked(d->irq, handle_level_irq);
369 else
370 __irq_set_handler_locked(d->irq, handle_edge_irq);
371
372 return IRQ_SET_MASK_OK_NOCOPY;
373 }
374
375 #ifdef CONFIG_SMP
376 static int bcm63xx_internal_set_affinity(struct irq_data *data,
377 const struct cpumask *dest,
378 bool force)
379 {
380 if (!irqd_irq_disabled(data))
381 internal_irq_unmask(data, dest);
382
383 return 0;
384 }
385 #endif
386
387 static struct irq_chip bcm63xx_internal_irq_chip = {
388 .name = "bcm63xx_ipic",
389 .irq_mask = bcm63xx_internal_irq_mask,
390 .irq_unmask = bcm63xx_internal_irq_unmask,
391 };
392
393 static struct irq_chip bcm63xx_external_irq_chip = {
394 .name = "bcm63xx_epic",
395 .irq_ack = bcm63xx_external_irq_clear,
396
397 .irq_mask = bcm63xx_external_irq_mask,
398 .irq_unmask = bcm63xx_external_irq_unmask,
399
400 .irq_set_type = bcm63xx_external_irq_set_type,
401 };
402
403 static struct irqaction cpu_ip2_cascade_action = {
404 .handler = no_action,
405 .name = "cascade_ip2",
406 .flags = IRQF_NO_THREAD,
407 };
408
409 #ifdef CONFIG_SMP
410 static struct irqaction cpu_ip3_cascade_action = {
411 .handler = no_action,
412 .name = "cascade_ip3",
413 .flags = IRQF_NO_THREAD,
414 };
415 #endif
416
417 static struct irqaction cpu_ext_cascade_action = {
418 .handler = no_action,
419 .name = "cascade_extirq",
420 .flags = IRQF_NO_THREAD,
421 };
422
423 static void bcm63xx_init_irq(void)
424 {
425 int irq_bits;
426
427 irq_stat_addr[0] = bcm63xx_regset_address(RSET_PERF);
428 irq_mask_addr[0] = bcm63xx_regset_address(RSET_PERF);
429 irq_stat_addr[1] = bcm63xx_regset_address(RSET_PERF);
430 irq_mask_addr[1] = bcm63xx_regset_address(RSET_PERF);
431
432 switch (bcm63xx_get_cpu_id()) {
433 case BCM3368_CPU_ID:
434 irq_stat_addr[0] += PERF_IRQSTAT_3368_REG;
435 irq_mask_addr[0] += PERF_IRQMASK_3368_REG;
436 irq_stat_addr[1] = 0;
437 irq_mask_addr[1] = 0;
438 irq_bits = 32;
439 ext_irq_count = 4;
440 ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_3368;
441 break;
442 case BCM6328_CPU_ID:
443 irq_stat_addr[0] += PERF_IRQSTAT_6328_REG(0);
444 irq_mask_addr[0] += PERF_IRQMASK_6328_REG(0);
445 irq_stat_addr[1] += PERF_IRQSTAT_6328_REG(1);
446 irq_mask_addr[1] += PERF_IRQMASK_6328_REG(1);
447 irq_bits = 64;
448 ext_irq_count = 4;
449 is_ext_irq_cascaded = 1;
450 ext_irq_start = BCM_6328_EXT_IRQ0 - IRQ_INTERNAL_BASE;
451 ext_irq_end = BCM_6328_EXT_IRQ3 - IRQ_INTERNAL_BASE;
452 ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6328;
453 break;
454 case BCM6338_CPU_ID:
455 irq_stat_addr[0] += PERF_IRQSTAT_6338_REG;
456 irq_mask_addr[0] += PERF_IRQMASK_6338_REG;
457 irq_stat_addr[1] = 0;
458 irq_mask_addr[1] = 0;
459 irq_bits = 32;
460 ext_irq_count = 4;
461 ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6338;
462 break;
463 case BCM6345_CPU_ID:
464 irq_stat_addr[0] += PERF_IRQSTAT_6345_REG;
465 irq_mask_addr[0] += PERF_IRQMASK_6345_REG;
466 irq_stat_addr[1] = 0;
467 irq_mask_addr[1] = 0;
468 irq_bits = 32;
469 ext_irq_count = 4;
470 ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6345;
471 break;
472 case BCM6348_CPU_ID:
473 irq_stat_addr[0] += PERF_IRQSTAT_6348_REG;
474 irq_mask_addr[0] += PERF_IRQMASK_6348_REG;
475 irq_stat_addr[1] = 0;
476 irq_mask_addr[1] = 0;
477 irq_bits = 32;
478 ext_irq_count = 4;
479 ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6348;
480 break;
481 case BCM6358_CPU_ID:
482 irq_stat_addr[0] += PERF_IRQSTAT_6358_REG(0);
483 irq_mask_addr[0] += PERF_IRQMASK_6358_REG(0);
484 irq_stat_addr[1] += PERF_IRQSTAT_6358_REG(1);
485 irq_mask_addr[1] += PERF_IRQMASK_6358_REG(1);
486 irq_bits = 32;
487 ext_irq_count = 4;
488 is_ext_irq_cascaded = 1;
489 ext_irq_start = BCM_6358_EXT_IRQ0 - IRQ_INTERNAL_BASE;
490 ext_irq_end = BCM_6358_EXT_IRQ3 - IRQ_INTERNAL_BASE;
491 ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6358;
492 break;
493 case BCM6362_CPU_ID:
494 irq_stat_addr[0] += PERF_IRQSTAT_6362_REG(0);
495 irq_mask_addr[0] += PERF_IRQMASK_6362_REG(0);
496 irq_stat_addr[1] += PERF_IRQSTAT_6362_REG(1);
497 irq_mask_addr[1] += PERF_IRQMASK_6362_REG(1);
498 irq_bits = 64;
499 ext_irq_count = 4;
500 is_ext_irq_cascaded = 1;
501 ext_irq_start = BCM_6362_EXT_IRQ0 - IRQ_INTERNAL_BASE;
502 ext_irq_end = BCM_6362_EXT_IRQ3 - IRQ_INTERNAL_BASE;
503 ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6362;
504 break;
505 case BCM6368_CPU_ID:
506 irq_stat_addr[0] += PERF_IRQSTAT_6368_REG(0);
507 irq_mask_addr[0] += PERF_IRQMASK_6368_REG(0);
508 irq_stat_addr[1] += PERF_IRQSTAT_6368_REG(1);
509 irq_mask_addr[1] += PERF_IRQMASK_6368_REG(1);
510 irq_bits = 64;
511 ext_irq_count = 6;
512 is_ext_irq_cascaded = 1;
513 ext_irq_start = BCM_6368_EXT_IRQ0 - IRQ_INTERNAL_BASE;
514 ext_irq_end = BCM_6368_EXT_IRQ5 - IRQ_INTERNAL_BASE;
515 ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6368;
516 ext_irq_cfg_reg2 = PERF_EXTIRQ_CFG_REG2_6368;
517 break;
518 default:
519 BUG();
520 }
521
522 if (irq_bits == 32) {
523 dispatch_internal = __dispatch_internal_32;
524 internal_irq_mask = __internal_irq_mask_32;
525 internal_irq_unmask = __internal_irq_unmask_32;
526 } else {
527 dispatch_internal = __dispatch_internal_64;
528 internal_irq_mask = __internal_irq_mask_64;
529 internal_irq_unmask = __internal_irq_unmask_64;
530 }
531 }
532
533 void __init arch_init_irq(void)
534 {
535 int i;
536
537 bcm63xx_init_irq();
538 mips_cpu_irq_init();
539 for (i = IRQ_INTERNAL_BASE; i < NR_IRQS; ++i)
540 irq_set_chip_and_handler(i, &bcm63xx_internal_irq_chip,
541 handle_level_irq);
542
543 for (i = IRQ_EXTERNAL_BASE; i < IRQ_EXTERNAL_BASE + ext_irq_count; ++i)
544 irq_set_chip_and_handler(i, &bcm63xx_external_irq_chip,
545 handle_edge_irq);
546
547 if (!is_ext_irq_cascaded) {
548 for (i = 3; i < 3 + ext_irq_count; ++i)
549 setup_irq(MIPS_CPU_IRQ_BASE + i, &cpu_ext_cascade_action);
550 }
551
552 setup_irq(MIPS_CPU_IRQ_BASE + 2, &cpu_ip2_cascade_action);
553 #ifdef CONFIG_SMP
554 if (is_ext_irq_cascaded) {
555 setup_irq(MIPS_CPU_IRQ_BASE + 3, &cpu_ip3_cascade_action);
556 bcm63xx_internal_irq_chip.irq_set_affinity =
557 bcm63xx_internal_set_affinity;
558
559 cpumask_clear(irq_default_affinity);
560 cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
561 }
562 #endif
563 }
Linux with added FPC-III support