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[mirror_ubuntu-artful-kernel.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.h>
15 #include <linux/irqchip/mips-gic.h>
16 #include <linux/of_address.h>
17 #include <linux/sched.h>
18 #include <linux/smp.h>
19
20 #include <asm/mips-cm.h>
21 #include <asm/setup.h>
22 #include <asm/traps.h>
23
24 #include <dt-bindings/interrupt-controller/mips-gic.h>
25
26 unsigned int gic_present;
27
28 struct gic_pcpu_mask {
29 DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS);
30 };
31
32 struct gic_irq_spec {
33 enum {
34 GIC_DEVICE,
35 GIC_IPI
36 } type;
37
38 union {
39 struct cpumask *ipimask;
40 unsigned int hwirq;
41 };
42 };
43
44 static unsigned long __gic_base_addr;
45
46 static void __iomem *gic_base;
47 static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
48 static DEFINE_SPINLOCK(gic_lock);
49 static struct irq_domain *gic_irq_domain;
50 static struct irq_domain *gic_dev_domain;
51 static struct irq_domain *gic_ipi_domain;
52 static int gic_shared_intrs;
53 static int gic_vpes;
54 static unsigned int gic_cpu_pin;
55 static unsigned int timer_cpu_pin;
56 static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
57 DECLARE_BITMAP(ipi_resrv, GIC_MAX_INTRS);
58
59 static void __gic_irq_dispatch(void);
60
61 static inline u32 gic_read32(unsigned int reg)
62 {
63 return __raw_readl(gic_base + reg);
64 }
65
66 static inline u64 gic_read64(unsigned int reg)
67 {
68 return __raw_readq(gic_base + reg);
69 }
70
71 static inline unsigned long gic_read(unsigned int reg)
72 {
73 if (!mips_cm_is64)
74 return gic_read32(reg);
75 else
76 return gic_read64(reg);
77 }
78
79 static inline void gic_write32(unsigned int reg, u32 val)
80 {
81 return __raw_writel(val, gic_base + reg);
82 }
83
84 static inline void gic_write64(unsigned int reg, u64 val)
85 {
86 return __raw_writeq(val, gic_base + reg);
87 }
88
89 static inline void gic_write(unsigned int reg, unsigned long val)
90 {
91 if (!mips_cm_is64)
92 return gic_write32(reg, (u32)val);
93 else
94 return gic_write64(reg, (u64)val);
95 }
96
97 static inline void gic_update_bits(unsigned int reg, unsigned long mask,
98 unsigned long val)
99 {
100 unsigned long regval;
101
102 regval = gic_read(reg);
103 regval &= ~mask;
104 regval |= val;
105 gic_write(reg, regval);
106 }
107
108 static inline void gic_reset_mask(unsigned int intr)
109 {
110 gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr),
111 1ul << GIC_INTR_BIT(intr));
112 }
113
114 static inline void gic_set_mask(unsigned int intr)
115 {
116 gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr),
117 1ul << GIC_INTR_BIT(intr));
118 }
119
120 static inline void gic_set_polarity(unsigned int intr, unsigned int pol)
121 {
122 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) +
123 GIC_INTR_OFS(intr), 1ul << GIC_INTR_BIT(intr),
124 (unsigned long)pol << GIC_INTR_BIT(intr));
125 }
126
127 static inline void gic_set_trigger(unsigned int intr, unsigned int trig)
128 {
129 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) +
130 GIC_INTR_OFS(intr), 1ul << GIC_INTR_BIT(intr),
131 (unsigned long)trig << GIC_INTR_BIT(intr));
132 }
133
134 static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual)
135 {
136 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr),
137 1ul << GIC_INTR_BIT(intr),
138 (unsigned long)dual << GIC_INTR_BIT(intr));
139 }
140
141 static inline void gic_map_to_pin(unsigned int intr, unsigned int pin)
142 {
143 gic_write32(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) +
144 GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin);
145 }
146
147 static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe)
148 {
149 gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) +
150 GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe),
151 GIC_SH_MAP_TO_VPE_REG_BIT(vpe));
152 }
153
154 #ifdef CONFIG_CLKSRC_MIPS_GIC
155 cycle_t gic_read_count(void)
156 {
157 unsigned int hi, hi2, lo;
158
159 if (mips_cm_is64)
160 return (cycle_t)gic_read(GIC_REG(SHARED, GIC_SH_COUNTER));
161
162 do {
163 hi = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
164 lo = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_31_00));
165 hi2 = gic_read32(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
166 } while (hi2 != hi);
167
168 return (((cycle_t) hi) << 32) + lo;
169 }
170
171 unsigned int gic_get_count_width(void)
172 {
173 unsigned int bits, config;
174
175 config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
176 bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
177 GIC_SH_CONFIG_COUNTBITS_SHF);
178
179 return bits;
180 }
181
182 void gic_write_compare(cycle_t cnt)
183 {
184 if (mips_cm_is64) {
185 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE), cnt);
186 } else {
187 gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
188 (int)(cnt >> 32));
189 gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
190 (int)(cnt & 0xffffffff));
191 }
192 }
193
194 void gic_write_cpu_compare(cycle_t cnt, int cpu)
195 {
196 unsigned long flags;
197
198 local_irq_save(flags);
199
200 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu);
201
202 if (mips_cm_is64) {
203 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE), cnt);
204 } else {
205 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI),
206 (int)(cnt >> 32));
207 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO),
208 (int)(cnt & 0xffffffff));
209 }
210
211 local_irq_restore(flags);
212 }
213
214 cycle_t gic_read_compare(void)
215 {
216 unsigned int hi, lo;
217
218 if (mips_cm_is64)
219 return (cycle_t)gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE));
220
221 hi = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI));
222 lo = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO));
223
224 return (((cycle_t) hi) << 32) + lo;
225 }
226
227 void gic_start_count(void)
228 {
229 u32 gicconfig;
230
231 /* Start the counter */
232 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
233 gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF);
234 gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
235 }
236
237 void gic_stop_count(void)
238 {
239 u32 gicconfig;
240
241 /* Stop the counter */
242 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
243 gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF;
244 gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
245 }
246
247 #endif
248
249 static bool gic_local_irq_is_routable(int intr)
250 {
251 u32 vpe_ctl;
252
253 /* All local interrupts are routable in EIC mode. */
254 if (cpu_has_veic)
255 return true;
256
257 vpe_ctl = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_CTL));
258 switch (intr) {
259 case GIC_LOCAL_INT_TIMER:
260 return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK;
261 case GIC_LOCAL_INT_PERFCTR:
262 return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK;
263 case GIC_LOCAL_INT_FDC:
264 return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK;
265 case GIC_LOCAL_INT_SWINT0:
266 case GIC_LOCAL_INT_SWINT1:
267 return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK;
268 default:
269 return true;
270 }
271 }
272
273 static void gic_bind_eic_interrupt(int irq, int set)
274 {
275 /* Convert irq vector # to hw int # */
276 irq -= GIC_PIN_TO_VEC_OFFSET;
277
278 /* Set irq to use shadow set */
279 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) +
280 GIC_VPE_EIC_SS(irq), set);
281 }
282
283 static void gic_send_ipi(struct irq_data *d, unsigned int cpu)
284 {
285 irq_hw_number_t hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(d));
286
287 gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(hwirq));
288 }
289
290 int gic_get_c0_compare_int(void)
291 {
292 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER))
293 return MIPS_CPU_IRQ_BASE + cp0_compare_irq;
294 return irq_create_mapping(gic_irq_domain,
295 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER));
296 }
297
298 int gic_get_c0_perfcount_int(void)
299 {
300 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) {
301 /* Is the performance counter shared with the timer? */
302 if (cp0_perfcount_irq < 0)
303 return -1;
304 return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
305 }
306 return irq_create_mapping(gic_irq_domain,
307 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR));
308 }
309
310 int gic_get_c0_fdc_int(void)
311 {
312 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) {
313 /* Is the FDC IRQ even present? */
314 if (cp0_fdc_irq < 0)
315 return -1;
316 return MIPS_CPU_IRQ_BASE + cp0_fdc_irq;
317 }
318
319 return irq_create_mapping(gic_irq_domain,
320 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC));
321 }
322
323 int gic_get_usm_range(struct resource *gic_usm_res)
324 {
325 if (!gic_present)
326 return -1;
327
328 gic_usm_res->start = __gic_base_addr + USM_VISIBLE_SECTION_OFS;
329 gic_usm_res->end = gic_usm_res->start + (USM_VISIBLE_SECTION_SIZE - 1);
330
331 return 0;
332 }
333
334 static void gic_handle_shared_int(bool chained)
335 {
336 unsigned int i, intr, virq, gic_reg_step = mips_cm_is64 ? 8 : 4;
337 unsigned long *pcpu_mask;
338 unsigned long pending_reg, intrmask_reg;
339 DECLARE_BITMAP(pending, GIC_MAX_INTRS);
340 DECLARE_BITMAP(intrmask, GIC_MAX_INTRS);
341
342 /* Get per-cpu bitmaps */
343 pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
344
345 pending_reg = GIC_REG(SHARED, GIC_SH_PEND);
346 intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK);
347
348 for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) {
349 pending[i] = gic_read(pending_reg);
350 intrmask[i] = gic_read(intrmask_reg);
351 pending_reg += gic_reg_step;
352 intrmask_reg += gic_reg_step;
353
354 if (!config_enabled(CONFIG_64BIT) || mips_cm_is64)
355 continue;
356
357 pending[i] |= (u64)gic_read(pending_reg) << 32;
358 intrmask[i] |= (u64)gic_read(intrmask_reg) << 32;
359 pending_reg += gic_reg_step;
360 intrmask_reg += gic_reg_step;
361 }
362
363 bitmap_and(pending, pending, intrmask, gic_shared_intrs);
364 bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs);
365
366 intr = find_first_bit(pending, gic_shared_intrs);
367 while (intr != gic_shared_intrs) {
368 virq = irq_linear_revmap(gic_irq_domain,
369 GIC_SHARED_TO_HWIRQ(intr));
370 if (chained)
371 generic_handle_irq(virq);
372 else
373 do_IRQ(virq);
374
375 /* go to next pending bit */
376 bitmap_clear(pending, intr, 1);
377 intr = find_first_bit(pending, gic_shared_intrs);
378 }
379 }
380
381 static void gic_mask_irq(struct irq_data *d)
382 {
383 gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
384 }
385
386 static void gic_unmask_irq(struct irq_data *d)
387 {
388 gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
389 }
390
391 static void gic_ack_irq(struct irq_data *d)
392 {
393 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
394
395 gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq));
396 }
397
398 static int gic_set_type(struct irq_data *d, unsigned int type)
399 {
400 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
401 unsigned long flags;
402 bool is_edge;
403
404 spin_lock_irqsave(&gic_lock, flags);
405 switch (type & IRQ_TYPE_SENSE_MASK) {
406 case IRQ_TYPE_EDGE_FALLING:
407 gic_set_polarity(irq, GIC_POL_NEG);
408 gic_set_trigger(irq, GIC_TRIG_EDGE);
409 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
410 is_edge = true;
411 break;
412 case IRQ_TYPE_EDGE_RISING:
413 gic_set_polarity(irq, GIC_POL_POS);
414 gic_set_trigger(irq, GIC_TRIG_EDGE);
415 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
416 is_edge = true;
417 break;
418 case IRQ_TYPE_EDGE_BOTH:
419 /* polarity is irrelevant in this case */
420 gic_set_trigger(irq, GIC_TRIG_EDGE);
421 gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE);
422 is_edge = true;
423 break;
424 case IRQ_TYPE_LEVEL_LOW:
425 gic_set_polarity(irq, GIC_POL_NEG);
426 gic_set_trigger(irq, GIC_TRIG_LEVEL);
427 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
428 is_edge = false;
429 break;
430 case IRQ_TYPE_LEVEL_HIGH:
431 default:
432 gic_set_polarity(irq, GIC_POL_POS);
433 gic_set_trigger(irq, GIC_TRIG_LEVEL);
434 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
435 is_edge = false;
436 break;
437 }
438
439 if (is_edge)
440 irq_set_chip_handler_name_locked(d, &gic_edge_irq_controller,
441 handle_edge_irq, NULL);
442 else
443 irq_set_chip_handler_name_locked(d, &gic_level_irq_controller,
444 handle_level_irq, NULL);
445 spin_unlock_irqrestore(&gic_lock, flags);
446
447 return 0;
448 }
449
450 #ifdef CONFIG_SMP
451 static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
452 bool force)
453 {
454 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
455 cpumask_t tmp = CPU_MASK_NONE;
456 unsigned long flags;
457 int i;
458
459 cpumask_and(&tmp, cpumask, cpu_online_mask);
460 if (cpumask_empty(&tmp))
461 return -EINVAL;
462
463 /* Assumption : cpumask refers to a single CPU */
464 spin_lock_irqsave(&gic_lock, flags);
465
466 /* Re-route this IRQ */
467 gic_map_to_vpe(irq, mips_cm_vp_id(cpumask_first(&tmp)));
468
469 /* Update the pcpu_masks */
470 for (i = 0; i < min(gic_vpes, NR_CPUS); i++)
471 clear_bit(irq, pcpu_masks[i].pcpu_mask);
472 set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask);
473
474 cpumask_copy(irq_data_get_affinity_mask(d), cpumask);
475 spin_unlock_irqrestore(&gic_lock, flags);
476
477 return IRQ_SET_MASK_OK_NOCOPY;
478 }
479 #endif
480
481 static struct irq_chip gic_level_irq_controller = {
482 .name = "MIPS GIC",
483 .irq_mask = gic_mask_irq,
484 .irq_unmask = gic_unmask_irq,
485 .irq_set_type = gic_set_type,
486 #ifdef CONFIG_SMP
487 .irq_set_affinity = gic_set_affinity,
488 #endif
489 };
490
491 static struct irq_chip gic_edge_irq_controller = {
492 .name = "MIPS GIC",
493 .irq_ack = gic_ack_irq,
494 .irq_mask = gic_mask_irq,
495 .irq_unmask = gic_unmask_irq,
496 .irq_set_type = gic_set_type,
497 #ifdef CONFIG_SMP
498 .irq_set_affinity = gic_set_affinity,
499 #endif
500 .ipi_send_single = gic_send_ipi,
501 };
502
503 static void gic_handle_local_int(bool chained)
504 {
505 unsigned long pending, masked;
506 unsigned int intr, virq;
507
508 pending = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
509 masked = gic_read32(GIC_REG(VPE_LOCAL, GIC_VPE_MASK));
510
511 bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS);
512
513 intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
514 while (intr != GIC_NUM_LOCAL_INTRS) {
515 virq = irq_linear_revmap(gic_irq_domain,
516 GIC_LOCAL_TO_HWIRQ(intr));
517 if (chained)
518 generic_handle_irq(virq);
519 else
520 do_IRQ(virq);
521
522 /* go to next pending bit */
523 bitmap_clear(&pending, intr, 1);
524 intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
525 }
526 }
527
528 static void gic_mask_local_irq(struct irq_data *d)
529 {
530 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
531
532 gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr);
533 }
534
535 static void gic_unmask_local_irq(struct irq_data *d)
536 {
537 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
538
539 gic_write32(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr);
540 }
541
542 static struct irq_chip gic_local_irq_controller = {
543 .name = "MIPS GIC Local",
544 .irq_mask = gic_mask_local_irq,
545 .irq_unmask = gic_unmask_local_irq,
546 };
547
548 static void gic_mask_local_irq_all_vpes(struct irq_data *d)
549 {
550 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
551 int i;
552 unsigned long flags;
553
554 spin_lock_irqsave(&gic_lock, flags);
555 for (i = 0; i < gic_vpes; i++) {
556 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
557 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr);
558 }
559 spin_unlock_irqrestore(&gic_lock, flags);
560 }
561
562 static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
563 {
564 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
565 int i;
566 unsigned long flags;
567
568 spin_lock_irqsave(&gic_lock, flags);
569 for (i = 0; i < gic_vpes; i++) {
570 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
571 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr);
572 }
573 spin_unlock_irqrestore(&gic_lock, flags);
574 }
575
576 static struct irq_chip gic_all_vpes_local_irq_controller = {
577 .name = "MIPS GIC Local",
578 .irq_mask = gic_mask_local_irq_all_vpes,
579 .irq_unmask = gic_unmask_local_irq_all_vpes,
580 };
581
582 static void __gic_irq_dispatch(void)
583 {
584 gic_handle_local_int(false);
585 gic_handle_shared_int(false);
586 }
587
588 static void gic_irq_dispatch(struct irq_desc *desc)
589 {
590 gic_handle_local_int(true);
591 gic_handle_shared_int(true);
592 }
593
594 static void __init gic_basic_init(void)
595 {
596 unsigned int i;
597
598 board_bind_eic_interrupt = &gic_bind_eic_interrupt;
599
600 /* Setup defaults */
601 for (i = 0; i < gic_shared_intrs; i++) {
602 gic_set_polarity(i, GIC_POL_POS);
603 gic_set_trigger(i, GIC_TRIG_LEVEL);
604 gic_reset_mask(i);
605 }
606
607 for (i = 0; i < gic_vpes; i++) {
608 unsigned int j;
609
610 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
611 for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) {
612 if (!gic_local_irq_is_routable(j))
613 continue;
614 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j);
615 }
616 }
617 }
618
619 static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq,
620 irq_hw_number_t hw)
621 {
622 int intr = GIC_HWIRQ_TO_LOCAL(hw);
623 int ret = 0;
624 int i;
625 unsigned long flags;
626
627 if (!gic_local_irq_is_routable(intr))
628 return -EPERM;
629
630 /*
631 * HACK: These are all really percpu interrupts, but the rest
632 * of the MIPS kernel code does not use the percpu IRQ API for
633 * the CP0 timer and performance counter interrupts.
634 */
635 switch (intr) {
636 case GIC_LOCAL_INT_TIMER:
637 case GIC_LOCAL_INT_PERFCTR:
638 case GIC_LOCAL_INT_FDC:
639 irq_set_chip_and_handler(virq,
640 &gic_all_vpes_local_irq_controller,
641 handle_percpu_irq);
642 break;
643 default:
644 irq_set_chip_and_handler(virq,
645 &gic_local_irq_controller,
646 handle_percpu_devid_irq);
647 irq_set_percpu_devid(virq);
648 break;
649 }
650
651 spin_lock_irqsave(&gic_lock, flags);
652 for (i = 0; i < gic_vpes; i++) {
653 u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin;
654
655 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
656
657 switch (intr) {
658 case GIC_LOCAL_INT_WD:
659 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val);
660 break;
661 case GIC_LOCAL_INT_COMPARE:
662 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP),
663 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_write32(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP),
669 val);
670 break;
671 case GIC_LOCAL_INT_PERFCTR:
672 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP),
673 val);
674 break;
675 case GIC_LOCAL_INT_SWINT0:
676 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP),
677 val);
678 break;
679 case GIC_LOCAL_INT_SWINT1:
680 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP),
681 val);
682 break;
683 case GIC_LOCAL_INT_FDC:
684 gic_write32(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val);
685 break;
686 default:
687 pr_err("Invalid local IRQ %d\n", intr);
688 ret = -EINVAL;
689 break;
690 }
691 }
692 spin_unlock_irqrestore(&gic_lock, flags);
693
694 return ret;
695 }
696
697 static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
698 irq_hw_number_t hw, unsigned int vpe)
699 {
700 int intr = GIC_HWIRQ_TO_SHARED(hw);
701 unsigned long flags;
702 int i;
703
704 irq_set_chip_and_handler(virq, &gic_level_irq_controller,
705 handle_level_irq);
706
707 spin_lock_irqsave(&gic_lock, flags);
708 gic_map_to_pin(intr, gic_cpu_pin);
709 gic_map_to_vpe(intr, vpe);
710 for (i = 0; i < min(gic_vpes, NR_CPUS); i++)
711 clear_bit(intr, pcpu_masks[i].pcpu_mask);
712 set_bit(intr, pcpu_masks[vpe].pcpu_mask);
713 spin_unlock_irqrestore(&gic_lock, flags);
714
715 return 0;
716 }
717
718 static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
719 irq_hw_number_t hw)
720 {
721 if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS)
722 return gic_local_irq_domain_map(d, virq, hw);
723 return gic_shared_irq_domain_map(d, virq, hw, 0);
724 }
725
726 static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,
727 unsigned int nr_irqs, void *arg)
728 {
729 struct gic_irq_spec *spec = arg;
730 irq_hw_number_t hwirq, base_hwirq;
731 int cpu, ret, i;
732
733 if (spec->type == GIC_DEVICE) {
734 /* verify that it doesn't conflict with an IPI irq */
735 if (test_bit(spec->hwirq, ipi_resrv))
736 return -EBUSY;
737 } else {
738 base_hwirq = find_first_bit(ipi_resrv, gic_shared_intrs);
739 if (base_hwirq == gic_shared_intrs) {
740 return -ENOMEM;
741 }
742
743 /* check that we have enough space */
744 for (i = base_hwirq; i < nr_irqs; i++) {
745 if (!test_bit(i, ipi_resrv))
746 return -EBUSY;
747 }
748 bitmap_clear(ipi_resrv, base_hwirq, nr_irqs);
749
750 /* map the hwirq for each cpu consecutively */
751 i = 0;
752 for_each_cpu(cpu, spec->ipimask) {
753 hwirq = GIC_SHARED_TO_HWIRQ(base_hwirq + i);
754
755 ret = irq_domain_set_hwirq_and_chip(d, virq + i, hwirq,
756 &gic_edge_irq_controller,
757 NULL);
758 if (ret)
759 goto error;
760
761 ret = gic_shared_irq_domain_map(d, virq + i, hwirq, cpu);
762 if (ret)
763 goto error;
764
765 i++;
766 }
767
768 /*
769 * tell the parent about the base hwirq we allocated so it can
770 * set its own domain data
771 */
772 spec->hwirq = base_hwirq;
773 }
774
775 return 0;
776 error:
777 bitmap_set(ipi_resrv, base_hwirq, nr_irqs);
778 return ret;
779 }
780
781 void gic_irq_domain_free(struct irq_domain *d, unsigned int virq,
782 unsigned int nr_irqs)
783 {
784 irq_hw_number_t base_hwirq;
785 struct irq_data *data;
786
787 data = irq_get_irq_data(virq);
788 if (!data)
789 return;
790
791 base_hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(data));
792 bitmap_set(ipi_resrv, base_hwirq, nr_irqs);
793 }
794
795 int gic_irq_domain_match(struct irq_domain *d, struct device_node *node,
796 enum irq_domain_bus_token bus_token)
797 {
798 /* this domain should'nt be accessed directly */
799 return 0;
800 }
801
802 static const struct irq_domain_ops gic_irq_domain_ops = {
803 .map = gic_irq_domain_map,
804 .alloc = gic_irq_domain_alloc,
805 .free = gic_irq_domain_free,
806 .match = gic_irq_domain_match,
807 };
808
809 static int gic_dev_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
810 const u32 *intspec, unsigned int intsize,
811 irq_hw_number_t *out_hwirq,
812 unsigned int *out_type)
813 {
814 if (intsize != 3)
815 return -EINVAL;
816
817 if (intspec[0] == GIC_SHARED)
818 *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]);
819 else if (intspec[0] == GIC_LOCAL)
820 *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]);
821 else
822 return -EINVAL;
823 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
824
825 return 0;
826 }
827
828 static int gic_dev_domain_alloc(struct irq_domain *d, unsigned int virq,
829 unsigned int nr_irqs, void *arg)
830 {
831 struct irq_fwspec *fwspec = arg;
832 struct gic_irq_spec spec = {
833 .type = GIC_DEVICE,
834 .hwirq = fwspec->param[1],
835 };
836 int i, ret;
837 bool is_shared = fwspec->param[0] == GIC_SHARED;
838
839 if (is_shared) {
840 ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &spec);
841 if (ret)
842 return ret;
843 }
844
845 for (i = 0; i < nr_irqs; i++) {
846 irq_hw_number_t hwirq;
847
848 if (is_shared)
849 hwirq = GIC_SHARED_TO_HWIRQ(spec.hwirq + i);
850 else
851 hwirq = GIC_LOCAL_TO_HWIRQ(spec.hwirq + i);
852
853 ret = irq_domain_set_hwirq_and_chip(d, virq + i,
854 hwirq,
855 &gic_level_irq_controller,
856 NULL);
857 if (ret)
858 return ret;
859 }
860
861 return 0;
862 }
863
864 void gic_dev_domain_free(struct irq_domain *d, unsigned int virq,
865 unsigned int nr_irqs)
866 {
867 /* no real allocation is done for dev irqs, so no need to free anything */
868 return;
869 }
870
871 static struct irq_domain_ops gic_dev_domain_ops = {
872 .xlate = gic_dev_domain_xlate,
873 .alloc = gic_dev_domain_alloc,
874 .free = gic_dev_domain_free,
875 };
876
877 static int gic_ipi_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
878 const u32 *intspec, unsigned int intsize,
879 irq_hw_number_t *out_hwirq,
880 unsigned int *out_type)
881 {
882 /*
883 * There's nothing to translate here. hwirq is dynamically allocated and
884 * the irq type is always edge triggered.
885 * */
886 *out_hwirq = 0;
887 *out_type = IRQ_TYPE_EDGE_RISING;
888
889 return 0;
890 }
891
892 static int gic_ipi_domain_alloc(struct irq_domain *d, unsigned int virq,
893 unsigned int nr_irqs, void *arg)
894 {
895 struct cpumask *ipimask = arg;
896 struct gic_irq_spec spec = {
897 .type = GIC_IPI,
898 .ipimask = ipimask
899 };
900 int ret, i;
901
902 ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &spec);
903 if (ret)
904 return ret;
905
906 /* the parent should have set spec.hwirq to the base_hwirq it allocated */
907 for (i = 0; i < nr_irqs; i++) {
908 ret = irq_domain_set_hwirq_and_chip(d, virq + i,
909 GIC_SHARED_TO_HWIRQ(spec.hwirq + i),
910 &gic_edge_irq_controller,
911 NULL);
912 if (ret)
913 goto error;
914
915 ret = irq_set_irq_type(virq + i, IRQ_TYPE_EDGE_RISING);
916 if (ret)
917 goto error;
918 }
919
920 return 0;
921 error:
922 irq_domain_free_irqs_parent(d, virq, nr_irqs);
923 return ret;
924 }
925
926 void gic_ipi_domain_free(struct irq_domain *d, unsigned int virq,
927 unsigned int nr_irqs)
928 {
929 irq_domain_free_irqs_parent(d, virq, nr_irqs);
930 }
931
932 int gic_ipi_domain_match(struct irq_domain *d, struct device_node *node,
933 enum irq_domain_bus_token bus_token)
934 {
935 bool is_ipi;
936
937 switch (bus_token) {
938 case DOMAIN_BUS_IPI:
939 is_ipi = d->bus_token == bus_token;
940 return to_of_node(d->fwnode) == node && is_ipi;
941 break;
942 default:
943 return 0;
944 }
945 }
946
947 static struct irq_domain_ops gic_ipi_domain_ops = {
948 .xlate = gic_ipi_domain_xlate,
949 .alloc = gic_ipi_domain_alloc,
950 .free = gic_ipi_domain_free,
951 .match = gic_ipi_domain_match,
952 };
953
954 static void __init __gic_init(unsigned long gic_base_addr,
955 unsigned long gic_addrspace_size,
956 unsigned int cpu_vec, unsigned int irqbase,
957 struct device_node *node)
958 {
959 unsigned int gicconfig;
960 unsigned int v[2];
961
962 __gic_base_addr = gic_base_addr;
963
964 gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
965
966 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
967 gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
968 GIC_SH_CONFIG_NUMINTRS_SHF;
969 gic_shared_intrs = ((gic_shared_intrs + 1) * 8);
970
971 gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
972 GIC_SH_CONFIG_NUMVPES_SHF;
973 gic_vpes = gic_vpes + 1;
974
975 if (cpu_has_veic) {
976 /* Always use vector 1 in EIC mode */
977 gic_cpu_pin = 0;
978 timer_cpu_pin = gic_cpu_pin;
979 set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
980 __gic_irq_dispatch);
981 } else {
982 gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
983 irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec,
984 gic_irq_dispatch);
985 /*
986 * With the CMP implementation of SMP (deprecated), other CPUs
987 * are started by the bootloader and put into a timer based
988 * waiting poll loop. We must not re-route those CPU's local
989 * timer interrupts as the wait instruction will never finish,
990 * so just handle whatever CPU interrupt it is routed to by
991 * default.
992 *
993 * This workaround should be removed when CMP support is
994 * dropped.
995 */
996 if (IS_ENABLED(CONFIG_MIPS_CMP) &&
997 gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) {
998 timer_cpu_pin = gic_read32(GIC_REG(VPE_LOCAL,
999 GIC_VPE_TIMER_MAP)) &
1000 GIC_MAP_MSK;
1001 irq_set_chained_handler(MIPS_CPU_IRQ_BASE +
1002 GIC_CPU_PIN_OFFSET +
1003 timer_cpu_pin,
1004 gic_irq_dispatch);
1005 } else {
1006 timer_cpu_pin = gic_cpu_pin;
1007 }
1008 }
1009
1010 gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS +
1011 gic_shared_intrs, irqbase,
1012 &gic_irq_domain_ops, NULL);
1013 if (!gic_irq_domain)
1014 panic("Failed to add GIC IRQ domain");
1015
1016 gic_dev_domain = irq_domain_add_hierarchy(gic_irq_domain, 0,
1017 GIC_NUM_LOCAL_INTRS + gic_shared_intrs,
1018 node, &gic_dev_domain_ops, NULL);
1019 if (!gic_dev_domain)
1020 panic("Failed to add GIC DEV domain");
1021
1022 gic_ipi_domain = irq_domain_add_hierarchy(gic_irq_domain,
1023 IRQ_DOMAIN_FLAG_IPI_PER_CPU,
1024 GIC_NUM_LOCAL_INTRS + gic_shared_intrs,
1025 node, &gic_ipi_domain_ops, NULL);
1026 if (!gic_ipi_domain)
1027 panic("Failed to add GIC IPI domain");
1028
1029 gic_ipi_domain->bus_token = DOMAIN_BUS_IPI;
1030
1031 if (node &&
1032 !of_property_read_u32_array(node, "mti,reserved-ipi-vectors", v, 2)) {
1033 bitmap_set(ipi_resrv, v[0], v[1]);
1034 } else {
1035 /* Make the last 2 * gic_vpes available for IPIs */
1036 bitmap_set(ipi_resrv,
1037 gic_shared_intrs - 2 * gic_vpes,
1038 2 * gic_vpes);
1039 }
1040
1041 gic_basic_init();
1042 }
1043
1044 void __init gic_init(unsigned long gic_base_addr,
1045 unsigned long gic_addrspace_size,
1046 unsigned int cpu_vec, unsigned int irqbase)
1047 {
1048 __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL);
1049 }
1050
1051 static int __init gic_of_init(struct device_node *node,
1052 struct device_node *parent)
1053 {
1054 struct resource res;
1055 unsigned int cpu_vec, i = 0, reserved = 0;
1056 phys_addr_t gic_base;
1057 size_t gic_len;
1058
1059 /* Find the first available CPU vector. */
1060 while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors",
1061 i++, &cpu_vec))
1062 reserved |= BIT(cpu_vec);
1063 for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) {
1064 if (!(reserved & BIT(cpu_vec)))
1065 break;
1066 }
1067 if (cpu_vec == 8) {
1068 pr_err("No CPU vectors available for GIC\n");
1069 return -ENODEV;
1070 }
1071
1072 if (of_address_to_resource(node, 0, &res)) {
1073 /*
1074 * Probe the CM for the GIC base address if not specified
1075 * in the device-tree.
1076 */
1077 if (mips_cm_present()) {
1078 gic_base = read_gcr_gic_base() &
1079 ~CM_GCR_GIC_BASE_GICEN_MSK;
1080 gic_len = 0x20000;
1081 } else {
1082 pr_err("Failed to get GIC memory range\n");
1083 return -ENODEV;
1084 }
1085 } else {
1086 gic_base = res.start;
1087 gic_len = resource_size(&res);
1088 }
1089
1090 if (mips_cm_present())
1091 write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK);
1092 gic_present = true;
1093
1094 __gic_init(gic_base, gic_len, cpu_vec, 0, node);
1095
1096 return 0;
1097 }
1098 IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);
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