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IB/hfi1: fix copy_to/from_user() error handling
[deliverable/linux.git] / drivers / irqchip / irq-mips-gic.c
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 Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
8 */
9 #include <linux/bitmap.h>
10 #include <linux/clocksource.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/irq.h>
14 #include <linux/irqchip/mips-gic.h>
15 #include <linux/of_address.h>
16 #include <linux/sched.h>
17 #include <linux/smp.h>
18
19 #include <asm/mips-cm.h>
20 #include <asm/setup.h>
21 #include <asm/traps.h>
22
23 #include <dt-bindings/interrupt-controller/mips-gic.h>
24
25 #include "irqchip.h"
26
27 unsigned int gic_present;
28
29 struct gic_pcpu_mask {
30 DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS);
31 };
32
33 static void __iomem *gic_base;
34 static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
35 static DEFINE_SPINLOCK(gic_lock);
36 static struct irq_domain *gic_irq_domain;
37 static int gic_shared_intrs;
38 static int gic_vpes;
39 static unsigned int gic_cpu_pin;
40 static unsigned int timer_cpu_pin;
41 static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
42
43 static void __gic_irq_dispatch(void);
44
45 static inline unsigned int gic_read(unsigned int reg)
46 {
47 return __raw_readl(gic_base + reg);
48 }
49
50 static inline void gic_write(unsigned int reg, unsigned int val)
51 {
52 __raw_writel(val, gic_base + reg);
53 }
54
55 static inline void gic_update_bits(unsigned int reg, unsigned int mask,
56 unsigned int val)
57 {
58 unsigned int regval;
59
60 regval = gic_read(reg);
61 regval &= ~mask;
62 regval |= val;
63 gic_write(reg, regval);
64 }
65
66 static inline void gic_reset_mask(unsigned int intr)
67 {
68 gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr),
69 1 << GIC_INTR_BIT(intr));
70 }
71
72 static inline void gic_set_mask(unsigned int intr)
73 {
74 gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr),
75 1 << GIC_INTR_BIT(intr));
76 }
77
78 static inline void gic_set_polarity(unsigned int intr, unsigned int pol)
79 {
80 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) +
81 GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr),
82 pol << GIC_INTR_BIT(intr));
83 }
84
85 static inline void gic_set_trigger(unsigned int intr, unsigned int trig)
86 {
87 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) +
88 GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr),
89 trig << GIC_INTR_BIT(intr));
90 }
91
92 static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual)
93 {
94 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr),
95 1 << GIC_INTR_BIT(intr),
96 dual << GIC_INTR_BIT(intr));
97 }
98
99 static inline void gic_map_to_pin(unsigned int intr, unsigned int pin)
100 {
101 gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) +
102 GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin);
103 }
104
105 static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe)
106 {
107 gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) +
108 GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe),
109 GIC_SH_MAP_TO_VPE_REG_BIT(vpe));
110 }
111
112 #ifdef CONFIG_CLKSRC_MIPS_GIC
113 cycle_t gic_read_count(void)
114 {
115 unsigned int hi, hi2, lo;
116
117 do {
118 hi = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
119 lo = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_31_00));
120 hi2 = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
121 } while (hi2 != hi);
122
123 return (((cycle_t) hi) << 32) + lo;
124 }
125
126 unsigned int gic_get_count_width(void)
127 {
128 unsigned int bits, config;
129
130 config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
131 bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
132 GIC_SH_CONFIG_COUNTBITS_SHF);
133
134 return bits;
135 }
136
137 void gic_write_compare(cycle_t cnt)
138 {
139 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
140 (int)(cnt >> 32));
141 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
142 (int)(cnt & 0xffffffff));
143 }
144
145 void gic_write_cpu_compare(cycle_t cnt, int cpu)
146 {
147 unsigned long flags;
148
149 local_irq_save(flags);
150
151 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu);
152 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI),
153 (int)(cnt >> 32));
154 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO),
155 (int)(cnt & 0xffffffff));
156
157 local_irq_restore(flags);
158 }
159
160 cycle_t gic_read_compare(void)
161 {
162 unsigned int hi, lo;
163
164 hi = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI));
165 lo = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO));
166
167 return (((cycle_t) hi) << 32) + lo;
168 }
169
170 void gic_start_count(void)
171 {
172 u32 gicconfig;
173
174 /* Start the counter */
175 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
176 gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF);
177 gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
178 }
179
180 void gic_stop_count(void)
181 {
182 u32 gicconfig;
183
184 /* Stop the counter */
185 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
186 gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF;
187 gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
188 }
189
190 #endif
191
192 static bool gic_local_irq_is_routable(int intr)
193 {
194 u32 vpe_ctl;
195
196 /* All local interrupts are routable in EIC mode. */
197 if (cpu_has_veic)
198 return true;
199
200 vpe_ctl = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_CTL));
201 switch (intr) {
202 case GIC_LOCAL_INT_TIMER:
203 return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK;
204 case GIC_LOCAL_INT_PERFCTR:
205 return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK;
206 case GIC_LOCAL_INT_FDC:
207 return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK;
208 case GIC_LOCAL_INT_SWINT0:
209 case GIC_LOCAL_INT_SWINT1:
210 return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK;
211 default:
212 return true;
213 }
214 }
215
216 static void gic_bind_eic_interrupt(int irq, int set)
217 {
218 /* Convert irq vector # to hw int # */
219 irq -= GIC_PIN_TO_VEC_OFFSET;
220
221 /* Set irq to use shadow set */
222 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) +
223 GIC_VPE_EIC_SS(irq), set);
224 }
225
226 void gic_send_ipi(unsigned int intr)
227 {
228 gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(intr));
229 }
230
231 int gic_get_c0_compare_int(void)
232 {
233 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER))
234 return MIPS_CPU_IRQ_BASE + cp0_compare_irq;
235 return irq_create_mapping(gic_irq_domain,
236 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER));
237 }
238
239 int gic_get_c0_perfcount_int(void)
240 {
241 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) {
242 /* Is the performance counter shared with the timer? */
243 if (cp0_perfcount_irq < 0)
244 return -1;
245 return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
246 }
247 return irq_create_mapping(gic_irq_domain,
248 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR));
249 }
250
251 int gic_get_c0_fdc_int(void)
252 {
253 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) {
254 /* Is the FDC IRQ even present? */
255 if (cp0_fdc_irq < 0)
256 return -1;
257 return MIPS_CPU_IRQ_BASE + cp0_fdc_irq;
258 }
259
260 return irq_create_mapping(gic_irq_domain,
261 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC));
262 }
263
264 static void gic_handle_shared_int(bool chained)
265 {
266 unsigned int i, intr, virq;
267 unsigned long *pcpu_mask;
268 unsigned long pending_reg, intrmask_reg;
269 DECLARE_BITMAP(pending, GIC_MAX_INTRS);
270 DECLARE_BITMAP(intrmask, GIC_MAX_INTRS);
271
272 /* Get per-cpu bitmaps */
273 pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
274
275 pending_reg = GIC_REG(SHARED, GIC_SH_PEND);
276 intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK);
277
278 for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) {
279 pending[i] = gic_read(pending_reg);
280 intrmask[i] = gic_read(intrmask_reg);
281 pending_reg += 0x4;
282 intrmask_reg += 0x4;
283 }
284
285 bitmap_and(pending, pending, intrmask, gic_shared_intrs);
286 bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs);
287
288 intr = find_first_bit(pending, gic_shared_intrs);
289 while (intr != gic_shared_intrs) {
290 virq = irq_linear_revmap(gic_irq_domain,
291 GIC_SHARED_TO_HWIRQ(intr));
292 if (chained)
293 generic_handle_irq(virq);
294 else
295 do_IRQ(virq);
296
297 /* go to next pending bit */
298 bitmap_clear(pending, intr, 1);
299 intr = find_first_bit(pending, gic_shared_intrs);
300 }
301 }
302
303 static void gic_mask_irq(struct irq_data *d)
304 {
305 gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
306 }
307
308 static void gic_unmask_irq(struct irq_data *d)
309 {
310 gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
311 }
312
313 static void gic_ack_irq(struct irq_data *d)
314 {
315 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
316
317 gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq));
318 }
319
320 static int gic_set_type(struct irq_data *d, unsigned int type)
321 {
322 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
323 unsigned long flags;
324 bool is_edge;
325
326 spin_lock_irqsave(&gic_lock, flags);
327 switch (type & IRQ_TYPE_SENSE_MASK) {
328 case IRQ_TYPE_EDGE_FALLING:
329 gic_set_polarity(irq, GIC_POL_NEG);
330 gic_set_trigger(irq, GIC_TRIG_EDGE);
331 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
332 is_edge = true;
333 break;
334 case IRQ_TYPE_EDGE_RISING:
335 gic_set_polarity(irq, GIC_POL_POS);
336 gic_set_trigger(irq, GIC_TRIG_EDGE);
337 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
338 is_edge = true;
339 break;
340 case IRQ_TYPE_EDGE_BOTH:
341 /* polarity is irrelevant in this case */
342 gic_set_trigger(irq, GIC_TRIG_EDGE);
343 gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE);
344 is_edge = true;
345 break;
346 case IRQ_TYPE_LEVEL_LOW:
347 gic_set_polarity(irq, GIC_POL_NEG);
348 gic_set_trigger(irq, GIC_TRIG_LEVEL);
349 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
350 is_edge = false;
351 break;
352 case IRQ_TYPE_LEVEL_HIGH:
353 default:
354 gic_set_polarity(irq, GIC_POL_POS);
355 gic_set_trigger(irq, GIC_TRIG_LEVEL);
356 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
357 is_edge = false;
358 break;
359 }
360
361 if (is_edge) {
362 __irq_set_chip_handler_name_locked(d->irq,
363 &gic_edge_irq_controller,
364 handle_edge_irq, NULL);
365 } else {
366 __irq_set_chip_handler_name_locked(d->irq,
367 &gic_level_irq_controller,
368 handle_level_irq, NULL);
369 }
370 spin_unlock_irqrestore(&gic_lock, flags);
371
372 return 0;
373 }
374
375 #ifdef CONFIG_SMP
376 static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
377 bool force)
378 {
379 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
380 cpumask_t tmp = CPU_MASK_NONE;
381 unsigned long flags;
382 int i;
383
384 cpumask_and(&tmp, cpumask, cpu_online_mask);
385 if (cpumask_empty(&tmp))
386 return -EINVAL;
387
388 /* Assumption : cpumask refers to a single CPU */
389 spin_lock_irqsave(&gic_lock, flags);
390
391 /* Re-route this IRQ */
392 gic_map_to_vpe(irq, cpumask_first(&tmp));
393
394 /* Update the pcpu_masks */
395 for (i = 0; i < NR_CPUS; i++)
396 clear_bit(irq, pcpu_masks[i].pcpu_mask);
397 set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask);
398
399 cpumask_copy(d->affinity, cpumask);
400 spin_unlock_irqrestore(&gic_lock, flags);
401
402 return IRQ_SET_MASK_OK_NOCOPY;
403 }
404 #endif
405
406 static struct irq_chip gic_level_irq_controller = {
407 .name = "MIPS GIC",
408 .irq_mask = gic_mask_irq,
409 .irq_unmask = gic_unmask_irq,
410 .irq_set_type = gic_set_type,
411 #ifdef CONFIG_SMP
412 .irq_set_affinity = gic_set_affinity,
413 #endif
414 };
415
416 static struct irq_chip gic_edge_irq_controller = {
417 .name = "MIPS GIC",
418 .irq_ack = gic_ack_irq,
419 .irq_mask = gic_mask_irq,
420 .irq_unmask = gic_unmask_irq,
421 .irq_set_type = gic_set_type,
422 #ifdef CONFIG_SMP
423 .irq_set_affinity = gic_set_affinity,
424 #endif
425 };
426
427 static void gic_handle_local_int(bool chained)
428 {
429 unsigned long pending, masked;
430 unsigned int intr, virq;
431
432 pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
433 masked = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_MASK));
434
435 bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS);
436
437 intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
438 while (intr != GIC_NUM_LOCAL_INTRS) {
439 virq = irq_linear_revmap(gic_irq_domain,
440 GIC_LOCAL_TO_HWIRQ(intr));
441 if (chained)
442 generic_handle_irq(virq);
443 else
444 do_IRQ(virq);
445
446 /* go to next pending bit */
447 bitmap_clear(&pending, intr, 1);
448 intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
449 }
450 }
451
452 static void gic_mask_local_irq(struct irq_data *d)
453 {
454 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
455
456 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr);
457 }
458
459 static void gic_unmask_local_irq(struct irq_data *d)
460 {
461 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
462
463 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr);
464 }
465
466 static struct irq_chip gic_local_irq_controller = {
467 .name = "MIPS GIC Local",
468 .irq_mask = gic_mask_local_irq,
469 .irq_unmask = gic_unmask_local_irq,
470 };
471
472 static void gic_mask_local_irq_all_vpes(struct irq_data *d)
473 {
474 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
475 int i;
476 unsigned long flags;
477
478 spin_lock_irqsave(&gic_lock, flags);
479 for (i = 0; i < gic_vpes; i++) {
480 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
481 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr);
482 }
483 spin_unlock_irqrestore(&gic_lock, flags);
484 }
485
486 static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
487 {
488 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
489 int i;
490 unsigned long flags;
491
492 spin_lock_irqsave(&gic_lock, flags);
493 for (i = 0; i < gic_vpes; i++) {
494 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
495 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr);
496 }
497 spin_unlock_irqrestore(&gic_lock, flags);
498 }
499
500 static struct irq_chip gic_all_vpes_local_irq_controller = {
501 .name = "MIPS GIC Local",
502 .irq_mask = gic_mask_local_irq_all_vpes,
503 .irq_unmask = gic_unmask_local_irq_all_vpes,
504 };
505
506 static void __gic_irq_dispatch(void)
507 {
508 gic_handle_local_int(false);
509 gic_handle_shared_int(false);
510 }
511
512 static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc)
513 {
514 gic_handle_local_int(true);
515 gic_handle_shared_int(true);
516 }
517
518 #ifdef CONFIG_MIPS_GIC_IPI
519 static int gic_resched_int_base;
520 static int gic_call_int_base;
521
522 unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
523 {
524 return gic_resched_int_base + cpu;
525 }
526
527 unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
528 {
529 return gic_call_int_base + cpu;
530 }
531
532 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
533 {
534 scheduler_ipi();
535
536 return IRQ_HANDLED;
537 }
538
539 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
540 {
541 generic_smp_call_function_interrupt();
542
543 return IRQ_HANDLED;
544 }
545
546 static struct irqaction irq_resched = {
547 .handler = ipi_resched_interrupt,
548 .flags = IRQF_PERCPU,
549 .name = "IPI resched"
550 };
551
552 static struct irqaction irq_call = {
553 .handler = ipi_call_interrupt,
554 .flags = IRQF_PERCPU,
555 .name = "IPI call"
556 };
557
558 static __init void gic_ipi_init_one(unsigned int intr, int cpu,
559 struct irqaction *action)
560 {
561 int virq = irq_create_mapping(gic_irq_domain,
562 GIC_SHARED_TO_HWIRQ(intr));
563 int i;
564
565 gic_map_to_vpe(intr, cpu);
566 for (i = 0; i < NR_CPUS; i++)
567 clear_bit(intr, pcpu_masks[i].pcpu_mask);
568 set_bit(intr, pcpu_masks[cpu].pcpu_mask);
569
570 irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING);
571
572 irq_set_handler(virq, handle_percpu_irq);
573 setup_irq(virq, action);
574 }
575
576 static __init void gic_ipi_init(void)
577 {
578 int i;
579
580 /* Use last 2 * NR_CPUS interrupts as IPIs */
581 gic_resched_int_base = gic_shared_intrs - nr_cpu_ids;
582 gic_call_int_base = gic_resched_int_base - nr_cpu_ids;
583
584 for (i = 0; i < nr_cpu_ids; i++) {
585 gic_ipi_init_one(gic_call_int_base + i, i, &irq_call);
586 gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched);
587 }
588 }
589 #else
590 static inline void gic_ipi_init(void)
591 {
592 }
593 #endif
594
595 static void __init gic_basic_init(void)
596 {
597 unsigned int i;
598
599 board_bind_eic_interrupt = &gic_bind_eic_interrupt;
600
601 /* Setup defaults */
602 for (i = 0; i < gic_shared_intrs; i++) {
603 gic_set_polarity(i, GIC_POL_POS);
604 gic_set_trigger(i, GIC_TRIG_LEVEL);
605 gic_reset_mask(i);
606 }
607
608 for (i = 0; i < gic_vpes; i++) {
609 unsigned int j;
610
611 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
612 for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) {
613 if (!gic_local_irq_is_routable(j))
614 continue;
615 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j);
616 }
617 }
618 }
619
620 static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq,
621 irq_hw_number_t hw)
622 {
623 int intr = GIC_HWIRQ_TO_LOCAL(hw);
624 int ret = 0;
625 int i;
626 unsigned long flags;
627
628 if (!gic_local_irq_is_routable(intr))
629 return -EPERM;
630
631 /*
632 * HACK: These are all really percpu interrupts, but the rest
633 * of the MIPS kernel code does not use the percpu IRQ API for
634 * the CP0 timer and performance counter interrupts.
635 */
636 switch (intr) {
637 case GIC_LOCAL_INT_TIMER:
638 case GIC_LOCAL_INT_PERFCTR:
639 case GIC_LOCAL_INT_FDC:
640 irq_set_chip_and_handler(virq,
641 &gic_all_vpes_local_irq_controller,
642 handle_percpu_irq);
643 break;
644 default:
645 irq_set_chip_and_handler(virq,
646 &gic_local_irq_controller,
647 handle_percpu_devid_irq);
648 irq_set_percpu_devid(virq);
649 break;
650 }
651
652 spin_lock_irqsave(&gic_lock, flags);
653 for (i = 0; i < gic_vpes; i++) {
654 u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin;
655
656 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
657
658 switch (intr) {
659 case GIC_LOCAL_INT_WD:
660 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val);
661 break;
662 case GIC_LOCAL_INT_COMPARE:
663 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP), val);
664 break;
665 case GIC_LOCAL_INT_TIMER:
666 /* CONFIG_MIPS_CMP workaround (see __gic_init) */
667 val = GIC_MAP_TO_PIN_MSK | timer_cpu_pin;
668 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP), val);
669 break;
670 case GIC_LOCAL_INT_PERFCTR:
671 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP), val);
672 break;
673 case GIC_LOCAL_INT_SWINT0:
674 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP), val);
675 break;
676 case GIC_LOCAL_INT_SWINT1:
677 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP), val);
678 break;
679 case GIC_LOCAL_INT_FDC:
680 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val);
681 break;
682 default:
683 pr_err("Invalid local IRQ %d\n", intr);
684 ret = -EINVAL;
685 break;
686 }
687 }
688 spin_unlock_irqrestore(&gic_lock, flags);
689
690 return ret;
691 }
692
693 static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
694 irq_hw_number_t hw)
695 {
696 int intr = GIC_HWIRQ_TO_SHARED(hw);
697 unsigned long flags;
698
699 irq_set_chip_and_handler(virq, &gic_level_irq_controller,
700 handle_level_irq);
701
702 spin_lock_irqsave(&gic_lock, flags);
703 gic_map_to_pin(intr, gic_cpu_pin);
704 /* Map to VPE 0 by default */
705 gic_map_to_vpe(intr, 0);
706 set_bit(intr, pcpu_masks[0].pcpu_mask);
707 spin_unlock_irqrestore(&gic_lock, flags);
708
709 return 0;
710 }
711
712 static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
713 irq_hw_number_t hw)
714 {
715 if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS)
716 return gic_local_irq_domain_map(d, virq, hw);
717 return gic_shared_irq_domain_map(d, virq, hw);
718 }
719
720 static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
721 const u32 *intspec, unsigned int intsize,
722 irq_hw_number_t *out_hwirq,
723 unsigned int *out_type)
724 {
725 if (intsize != 3)
726 return -EINVAL;
727
728 if (intspec[0] == GIC_SHARED)
729 *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]);
730 else if (intspec[0] == GIC_LOCAL)
731 *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]);
732 else
733 return -EINVAL;
734 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
735
736 return 0;
737 }
738
739 static const struct irq_domain_ops gic_irq_domain_ops = {
740 .map = gic_irq_domain_map,
741 .xlate = gic_irq_domain_xlate,
742 };
743
744 static void __init __gic_init(unsigned long gic_base_addr,
745 unsigned long gic_addrspace_size,
746 unsigned int cpu_vec, unsigned int irqbase,
747 struct device_node *node)
748 {
749 unsigned int gicconfig;
750
751 gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
752
753 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
754 gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
755 GIC_SH_CONFIG_NUMINTRS_SHF;
756 gic_shared_intrs = ((gic_shared_intrs + 1) * 8);
757
758 gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
759 GIC_SH_CONFIG_NUMVPES_SHF;
760 gic_vpes = gic_vpes + 1;
761
762 if (cpu_has_veic) {
763 /* Always use vector 1 in EIC mode */
764 gic_cpu_pin = 0;
765 timer_cpu_pin = gic_cpu_pin;
766 set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
767 __gic_irq_dispatch);
768 } else {
769 gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
770 irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec,
771 gic_irq_dispatch);
772 /*
773 * With the CMP implementation of SMP (deprecated), other CPUs
774 * are started by the bootloader and put into a timer based
775 * waiting poll loop. We must not re-route those CPU's local
776 * timer interrupts as the wait instruction will never finish,
777 * so just handle whatever CPU interrupt it is routed to by
778 * default.
779 *
780 * This workaround should be removed when CMP support is
781 * dropped.
782 */
783 if (IS_ENABLED(CONFIG_MIPS_CMP) &&
784 gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) {
785 timer_cpu_pin = gic_read(GIC_REG(VPE_LOCAL,
786 GIC_VPE_TIMER_MAP)) &
787 GIC_MAP_MSK;
788 irq_set_chained_handler(MIPS_CPU_IRQ_BASE +
789 GIC_CPU_PIN_OFFSET +
790 timer_cpu_pin,
791 gic_irq_dispatch);
792 } else {
793 timer_cpu_pin = gic_cpu_pin;
794 }
795 }
796
797 gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS +
798 gic_shared_intrs, irqbase,
799 &gic_irq_domain_ops, NULL);
800 if (!gic_irq_domain)
801 panic("Failed to add GIC IRQ domain");
802
803 gic_basic_init();
804
805 gic_ipi_init();
806 }
807
808 void __init gic_init(unsigned long gic_base_addr,
809 unsigned long gic_addrspace_size,
810 unsigned int cpu_vec, unsigned int irqbase)
811 {
812 __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL);
813 }
814
815 static int __init gic_of_init(struct device_node *node,
816 struct device_node *parent)
817 {
818 struct resource res;
819 unsigned int cpu_vec, i = 0, reserved = 0;
820 phys_addr_t gic_base;
821 size_t gic_len;
822
823 /* Find the first available CPU vector. */
824 while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors",
825 i++, &cpu_vec))
826 reserved |= BIT(cpu_vec);
827 for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) {
828 if (!(reserved & BIT(cpu_vec)))
829 break;
830 }
831 if (cpu_vec == 8) {
832 pr_err("No CPU vectors available for GIC\n");
833 return -ENODEV;
834 }
835
836 if (of_address_to_resource(node, 0, &res)) {
837 /*
838 * Probe the CM for the GIC base address if not specified
839 * in the device-tree.
840 */
841 if (mips_cm_present()) {
842 gic_base = read_gcr_gic_base() &
843 ~CM_GCR_GIC_BASE_GICEN_MSK;
844 gic_len = 0x20000;
845 } else {
846 pr_err("Failed to get GIC memory range\n");
847 return -ENODEV;
848 }
849 } else {
850 gic_base = res.start;
851 gic_len = resource_size(&res);
852 }
853
854 if (mips_cm_present())
855 write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK);
856 gic_present = true;
857
858 __gic_init(gic_base, gic_len, cpu_vec, 0, node);
859
860 return 0;
861 }
862 IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);
Linux kernel - Deliverables
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