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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
26unsigned int gic_present;
27
28struct gic_pcpu_mask {
29 DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS);
30};
31
32struct 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
44static unsigned long __gic_base_addr;
45
46static void __iomem *gic_base;
47static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
48static DEFINE_SPINLOCK(gic_lock);
49static struct irq_domain *gic_irq_domain;
50static struct irq_domain *gic_dev_domain;
51static struct irq_domain *gic_ipi_domain;
52static int gic_shared_intrs;
53static int gic_vpes;
54static unsigned int gic_cpu_pin;
55static unsigned int timer_cpu_pin;
56static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
57DECLARE_BITMAP(ipi_resrv, GIC_MAX_INTRS);
58
59static void __gic_irq_dispatch(void);
60
61static inline u32 gic_read32(unsigned int reg)
62{
63 return __raw_readl(gic_base + reg);
64}
65
66static inline u64 gic_read64(unsigned int reg)
67{
68 return __raw_readq(gic_base + reg);
69}
70
71static 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
79static inline void gic_write32(unsigned int reg, u32 val)
80{
81 return __raw_writel(val, gic_base + reg);
82}
83
84static inline void gic_write64(unsigned int reg, u64 val)
85{
86 return __raw_writeq(val, gic_base + reg);
87}
88
89static 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
97static 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
108static 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
114static 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
120static 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
127static 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
134static 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
141static 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
147static 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
155cycle_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
171unsigned 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
182void 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
194void 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
214cycle_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
227void 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
237void 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
249static 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
273static 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
283static 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
290int 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
298int 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
310int 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
323int 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
334static 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
381static void gic_mask_irq(struct irq_data *d)
382{
383 gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
384}
385
386static void gic_unmask_irq(struct irq_data *d)
387{
388 gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
389}
390
391static 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
398static 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
451static 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
481static 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
491static 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
503static 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
528static 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
535static 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
542static 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
548static 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
562static 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
576static 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
582static void __gic_irq_dispatch(void)
583{
584 gic_handle_local_int(false);
585 gic_handle_shared_int(false);
586}
587
588static void gic_irq_dispatch(struct irq_desc *desc)
589{
590 gic_handle_local_int(true);
591 gic_handle_shared_int(true);
592}
593
594static 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
619static 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
697static 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
718static 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
726static 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;
776error:
777 bitmap_set(ipi_resrv, base_hwirq, nr_irqs);
778 return ret;
779}
780
781void 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
795int 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
802static 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
809static 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
828static 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
864void 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
871static 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
877static 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
892static 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;
921error:
922 irq_domain_free_irqs_parent(d, virq, nr_irqs);
923 return ret;
924}
925
926void 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
932int 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
947static 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
954static 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
1044void __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
1051static 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}
1098IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);
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
10#define pr_fmt(fmt) "irq-mips-gic: " fmt
11
12#include <linux/bitmap.h>
13#include <linux/clocksource.h>
14#include <linux/cpuhotplug.h>
15#include <linux/init.h>
16#include <linux/interrupt.h>
17#include <linux/irq.h>
18#include <linux/irqchip.h>
19#include <linux/of_address.h>
20#include <linux/percpu.h>
21#include <linux/sched.h>
22#include <linux/smp.h>
23
24#include <asm/mips-cps.h>
25#include <asm/setup.h>
26#include <asm/traps.h>
27
28#include <dt-bindings/interrupt-controller/mips-gic.h>
29
30#define GIC_MAX_INTRS 256
31#define GIC_MAX_LONGS BITS_TO_LONGS(GIC_MAX_INTRS)
32
33/* Add 2 to convert GIC CPU pin to core interrupt */
34#define GIC_CPU_PIN_OFFSET 2
35
36/* Mapped interrupt to pin X, then GIC will generate the vector (X+1). */
37#define GIC_PIN_TO_VEC_OFFSET 1
38
39/* Convert between local/shared IRQ number and GIC HW IRQ number. */
40#define GIC_LOCAL_HWIRQ_BASE 0
41#define GIC_LOCAL_TO_HWIRQ(x) (GIC_LOCAL_HWIRQ_BASE + (x))
42#define GIC_HWIRQ_TO_LOCAL(x) ((x) - GIC_LOCAL_HWIRQ_BASE)
43#define GIC_SHARED_HWIRQ_BASE GIC_NUM_LOCAL_INTRS
44#define GIC_SHARED_TO_HWIRQ(x) (GIC_SHARED_HWIRQ_BASE + (x))
45#define GIC_HWIRQ_TO_SHARED(x) ((x) - GIC_SHARED_HWIRQ_BASE)
46
47void __iomem *mips_gic_base;
48
49static DEFINE_PER_CPU_READ_MOSTLY(unsigned long[GIC_MAX_LONGS], pcpu_masks);
50
51static DEFINE_SPINLOCK(gic_lock);
52static struct irq_domain *gic_irq_domain;
53static struct irq_domain *gic_ipi_domain;
54static int gic_shared_intrs;
55static unsigned int gic_cpu_pin;
56static unsigned int timer_cpu_pin;
57static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
58static DECLARE_BITMAP(ipi_resrv, GIC_MAX_INTRS);
59static DECLARE_BITMAP(ipi_available, GIC_MAX_INTRS);
60
61static struct gic_all_vpes_chip_data {
62 u32 map;
63 bool mask;
64} gic_all_vpes_chip_data[GIC_NUM_LOCAL_INTRS];
65
66static void gic_clear_pcpu_masks(unsigned int intr)
67{
68 unsigned int i;
69
70 /* Clear the interrupt's bit in all pcpu_masks */
71 for_each_possible_cpu(i)
72 clear_bit(intr, per_cpu_ptr(pcpu_masks, i));
73}
74
75static bool gic_local_irq_is_routable(int intr)
76{
77 u32 vpe_ctl;
78
79 /* All local interrupts are routable in EIC mode. */
80 if (cpu_has_veic)
81 return true;
82
83 vpe_ctl = read_gic_vl_ctl();
84 switch (intr) {
85 case GIC_LOCAL_INT_TIMER:
86 return vpe_ctl & GIC_VX_CTL_TIMER_ROUTABLE;
87 case GIC_LOCAL_INT_PERFCTR:
88 return vpe_ctl & GIC_VX_CTL_PERFCNT_ROUTABLE;
89 case GIC_LOCAL_INT_FDC:
90 return vpe_ctl & GIC_VX_CTL_FDC_ROUTABLE;
91 case GIC_LOCAL_INT_SWINT0:
92 case GIC_LOCAL_INT_SWINT1:
93 return vpe_ctl & GIC_VX_CTL_SWINT_ROUTABLE;
94 default:
95 return true;
96 }
97}
98
99static void gic_bind_eic_interrupt(int irq, int set)
100{
101 /* Convert irq vector # to hw int # */
102 irq -= GIC_PIN_TO_VEC_OFFSET;
103
104 /* Set irq to use shadow set */
105 write_gic_vl_eic_shadow_set(irq, set);
106}
107
108static void gic_send_ipi(struct irq_data *d, unsigned int cpu)
109{
110 irq_hw_number_t hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(d));
111
112 write_gic_wedge(GIC_WEDGE_RW | hwirq);
113}
114
115int gic_get_c0_compare_int(void)
116{
117 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER))
118 return MIPS_CPU_IRQ_BASE + cp0_compare_irq;
119 return irq_create_mapping(gic_irq_domain,
120 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER));
121}
122
123int gic_get_c0_perfcount_int(void)
124{
125 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) {
126 /* Is the performance counter shared with the timer? */
127 if (cp0_perfcount_irq < 0)
128 return -1;
129 return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
130 }
131 return irq_create_mapping(gic_irq_domain,
132 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR));
133}
134
135int gic_get_c0_fdc_int(void)
136{
137 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) {
138 /* Is the FDC IRQ even present? */
139 if (cp0_fdc_irq < 0)
140 return -1;
141 return MIPS_CPU_IRQ_BASE + cp0_fdc_irq;
142 }
143
144 return irq_create_mapping(gic_irq_domain,
145 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC));
146}
147
148static void gic_handle_shared_int(bool chained)
149{
150 unsigned int intr, virq;
151 unsigned long *pcpu_mask;
152 DECLARE_BITMAP(pending, GIC_MAX_INTRS);
153
154 /* Get per-cpu bitmaps */
155 pcpu_mask = this_cpu_ptr(pcpu_masks);
156
157 if (mips_cm_is64)
158 __ioread64_copy(pending, addr_gic_pend(),
159 DIV_ROUND_UP(gic_shared_intrs, 64));
160 else
161 __ioread32_copy(pending, addr_gic_pend(),
162 DIV_ROUND_UP(gic_shared_intrs, 32));
163
164 bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs);
165
166 for_each_set_bit(intr, pending, gic_shared_intrs) {
167 virq = irq_linear_revmap(gic_irq_domain,
168 GIC_SHARED_TO_HWIRQ(intr));
169 if (chained)
170 generic_handle_irq(virq);
171 else
172 do_IRQ(virq);
173 }
174}
175
176static void gic_mask_irq(struct irq_data *d)
177{
178 unsigned int intr = GIC_HWIRQ_TO_SHARED(d->hwirq);
179
180 write_gic_rmask(intr);
181 gic_clear_pcpu_masks(intr);
182}
183
184static void gic_unmask_irq(struct irq_data *d)
185{
186 unsigned int intr = GIC_HWIRQ_TO_SHARED(d->hwirq);
187 unsigned int cpu;
188
189 write_gic_smask(intr);
190
191 gic_clear_pcpu_masks(intr);
192 cpu = cpumask_first(irq_data_get_effective_affinity_mask(d));
193 set_bit(intr, per_cpu_ptr(pcpu_masks, cpu));
194}
195
196static void gic_ack_irq(struct irq_data *d)
197{
198 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
199
200 write_gic_wedge(irq);
201}
202
203static int gic_set_type(struct irq_data *d, unsigned int type)
204{
205 unsigned int irq, pol, trig, dual;
206 unsigned long flags;
207
208 irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
209
210 spin_lock_irqsave(&gic_lock, flags);
211 switch (type & IRQ_TYPE_SENSE_MASK) {
212 case IRQ_TYPE_EDGE_FALLING:
213 pol = GIC_POL_FALLING_EDGE;
214 trig = GIC_TRIG_EDGE;
215 dual = GIC_DUAL_SINGLE;
216 break;
217 case IRQ_TYPE_EDGE_RISING:
218 pol = GIC_POL_RISING_EDGE;
219 trig = GIC_TRIG_EDGE;
220 dual = GIC_DUAL_SINGLE;
221 break;
222 case IRQ_TYPE_EDGE_BOTH:
223 pol = 0; /* Doesn't matter */
224 trig = GIC_TRIG_EDGE;
225 dual = GIC_DUAL_DUAL;
226 break;
227 case IRQ_TYPE_LEVEL_LOW:
228 pol = GIC_POL_ACTIVE_LOW;
229 trig = GIC_TRIG_LEVEL;
230 dual = GIC_DUAL_SINGLE;
231 break;
232 case IRQ_TYPE_LEVEL_HIGH:
233 default:
234 pol = GIC_POL_ACTIVE_HIGH;
235 trig = GIC_TRIG_LEVEL;
236 dual = GIC_DUAL_SINGLE;
237 break;
238 }
239
240 change_gic_pol(irq, pol);
241 change_gic_trig(irq, trig);
242 change_gic_dual(irq, dual);
243
244 if (trig == GIC_TRIG_EDGE)
245 irq_set_chip_handler_name_locked(d, &gic_edge_irq_controller,
246 handle_edge_irq, NULL);
247 else
248 irq_set_chip_handler_name_locked(d, &gic_level_irq_controller,
249 handle_level_irq, NULL);
250 spin_unlock_irqrestore(&gic_lock, flags);
251
252 return 0;
253}
254
255#ifdef CONFIG_SMP
256static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
257 bool force)
258{
259 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
260 unsigned long flags;
261 unsigned int cpu;
262
263 cpu = cpumask_first_and(cpumask, cpu_online_mask);
264 if (cpu >= NR_CPUS)
265 return -EINVAL;
266
267 /* Assumption : cpumask refers to a single CPU */
268 spin_lock_irqsave(&gic_lock, flags);
269
270 /* Re-route this IRQ */
271 write_gic_map_vp(irq, BIT(mips_cm_vp_id(cpu)));
272
273 /* Update the pcpu_masks */
274 gic_clear_pcpu_masks(irq);
275 if (read_gic_mask(irq))
276 set_bit(irq, per_cpu_ptr(pcpu_masks, cpu));
277
278 irq_data_update_effective_affinity(d, cpumask_of(cpu));
279 spin_unlock_irqrestore(&gic_lock, flags);
280
281 return IRQ_SET_MASK_OK;
282}
283#endif
284
285static struct irq_chip gic_level_irq_controller = {
286 .name = "MIPS GIC",
287 .irq_mask = gic_mask_irq,
288 .irq_unmask = gic_unmask_irq,
289 .irq_set_type = gic_set_type,
290#ifdef CONFIG_SMP
291 .irq_set_affinity = gic_set_affinity,
292#endif
293};
294
295static struct irq_chip gic_edge_irq_controller = {
296 .name = "MIPS GIC",
297 .irq_ack = gic_ack_irq,
298 .irq_mask = gic_mask_irq,
299 .irq_unmask = gic_unmask_irq,
300 .irq_set_type = gic_set_type,
301#ifdef CONFIG_SMP
302 .irq_set_affinity = gic_set_affinity,
303#endif
304 .ipi_send_single = gic_send_ipi,
305};
306
307static void gic_handle_local_int(bool chained)
308{
309 unsigned long pending, masked;
310 unsigned int intr, virq;
311
312 pending = read_gic_vl_pend();
313 masked = read_gic_vl_mask();
314
315 bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS);
316
317 for_each_set_bit(intr, &pending, GIC_NUM_LOCAL_INTRS) {
318 virq = irq_linear_revmap(gic_irq_domain,
319 GIC_LOCAL_TO_HWIRQ(intr));
320 if (chained)
321 generic_handle_irq(virq);
322 else
323 do_IRQ(virq);
324 }
325}
326
327static void gic_mask_local_irq(struct irq_data *d)
328{
329 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
330
331 write_gic_vl_rmask(BIT(intr));
332}
333
334static void gic_unmask_local_irq(struct irq_data *d)
335{
336 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
337
338 write_gic_vl_smask(BIT(intr));
339}
340
341static struct irq_chip gic_local_irq_controller = {
342 .name = "MIPS GIC Local",
343 .irq_mask = gic_mask_local_irq,
344 .irq_unmask = gic_unmask_local_irq,
345};
346
347static void gic_mask_local_irq_all_vpes(struct irq_data *d)
348{
349 struct gic_all_vpes_chip_data *cd;
350 unsigned long flags;
351 int intr, cpu;
352
353 intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
354 cd = irq_data_get_irq_chip_data(d);
355 cd->mask = false;
356
357 spin_lock_irqsave(&gic_lock, flags);
358 for_each_online_cpu(cpu) {
359 write_gic_vl_other(mips_cm_vp_id(cpu));
360 write_gic_vo_rmask(BIT(intr));
361 }
362 spin_unlock_irqrestore(&gic_lock, flags);
363}
364
365static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
366{
367 struct gic_all_vpes_chip_data *cd;
368 unsigned long flags;
369 int intr, cpu;
370
371 intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
372 cd = irq_data_get_irq_chip_data(d);
373 cd->mask = true;
374
375 spin_lock_irqsave(&gic_lock, flags);
376 for_each_online_cpu(cpu) {
377 write_gic_vl_other(mips_cm_vp_id(cpu));
378 write_gic_vo_smask(BIT(intr));
379 }
380 spin_unlock_irqrestore(&gic_lock, flags);
381}
382
383static void gic_all_vpes_irq_cpu_online(struct irq_data *d)
384{
385 struct gic_all_vpes_chip_data *cd;
386 unsigned int intr;
387
388 intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
389 cd = irq_data_get_irq_chip_data(d);
390
391 write_gic_vl_map(mips_gic_vx_map_reg(intr), cd->map);
392 if (cd->mask)
393 write_gic_vl_smask(BIT(intr));
394}
395
396static struct irq_chip gic_all_vpes_local_irq_controller = {
397 .name = "MIPS GIC Local",
398 .irq_mask = gic_mask_local_irq_all_vpes,
399 .irq_unmask = gic_unmask_local_irq_all_vpes,
400 .irq_cpu_online = gic_all_vpes_irq_cpu_online,
401};
402
403static void __gic_irq_dispatch(void)
404{
405 gic_handle_local_int(false);
406 gic_handle_shared_int(false);
407}
408
409static void gic_irq_dispatch(struct irq_desc *desc)
410{
411 gic_handle_local_int(true);
412 gic_handle_shared_int(true);
413}
414
415static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
416 irq_hw_number_t hw, unsigned int cpu)
417{
418 int intr = GIC_HWIRQ_TO_SHARED(hw);
419 struct irq_data *data;
420 unsigned long flags;
421
422 data = irq_get_irq_data(virq);
423
424 spin_lock_irqsave(&gic_lock, flags);
425 write_gic_map_pin(intr, GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin);
426 write_gic_map_vp(intr, BIT(mips_cm_vp_id(cpu)));
427 irq_data_update_effective_affinity(data, cpumask_of(cpu));
428 spin_unlock_irqrestore(&gic_lock, flags);
429
430 return 0;
431}
432
433static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
434 const u32 *intspec, unsigned int intsize,
435 irq_hw_number_t *out_hwirq,
436 unsigned int *out_type)
437{
438 if (intsize != 3)
439 return -EINVAL;
440
441 if (intspec[0] == GIC_SHARED)
442 *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]);
443 else if (intspec[0] == GIC_LOCAL)
444 *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]);
445 else
446 return -EINVAL;
447 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
448
449 return 0;
450}
451
452static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
453 irq_hw_number_t hwirq)
454{
455 struct gic_all_vpes_chip_data *cd;
456 unsigned long flags;
457 unsigned int intr;
458 int err, cpu;
459 u32 map;
460
461 if (hwirq >= GIC_SHARED_HWIRQ_BASE) {
462 /* verify that shared irqs don't conflict with an IPI irq */
463 if (test_bit(GIC_HWIRQ_TO_SHARED(hwirq), ipi_resrv))
464 return -EBUSY;
465
466 err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
467 &gic_level_irq_controller,
468 NULL);
469 if (err)
470 return err;
471
472 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
473 return gic_shared_irq_domain_map(d, virq, hwirq, 0);
474 }
475
476 intr = GIC_HWIRQ_TO_LOCAL(hwirq);
477 map = GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin;
478
479 switch (intr) {
480 case GIC_LOCAL_INT_TIMER:
481 /* CONFIG_MIPS_CMP workaround (see __gic_init) */
482 map = GIC_MAP_PIN_MAP_TO_PIN | timer_cpu_pin;
483 fallthrough;
484 case GIC_LOCAL_INT_PERFCTR:
485 case GIC_LOCAL_INT_FDC:
486 /*
487 * HACK: These are all really percpu interrupts, but
488 * the rest of the MIPS kernel code does not use the
489 * percpu IRQ API for them.
490 */
491 cd = &gic_all_vpes_chip_data[intr];
492 cd->map = map;
493 err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
494 &gic_all_vpes_local_irq_controller,
495 cd);
496 if (err)
497 return err;
498
499 irq_set_handler(virq, handle_percpu_irq);
500 break;
501
502 default:
503 err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
504 &gic_local_irq_controller,
505 NULL);
506 if (err)
507 return err;
508
509 irq_set_handler(virq, handle_percpu_devid_irq);
510 irq_set_percpu_devid(virq);
511 break;
512 }
513
514 if (!gic_local_irq_is_routable(intr))
515 return -EPERM;
516
517 spin_lock_irqsave(&gic_lock, flags);
518 for_each_online_cpu(cpu) {
519 write_gic_vl_other(mips_cm_vp_id(cpu));
520 write_gic_vo_map(mips_gic_vx_map_reg(intr), map);
521 }
522 spin_unlock_irqrestore(&gic_lock, flags);
523
524 return 0;
525}
526
527static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,
528 unsigned int nr_irqs, void *arg)
529{
530 struct irq_fwspec *fwspec = arg;
531 irq_hw_number_t hwirq;
532
533 if (fwspec->param[0] == GIC_SHARED)
534 hwirq = GIC_SHARED_TO_HWIRQ(fwspec->param[1]);
535 else
536 hwirq = GIC_LOCAL_TO_HWIRQ(fwspec->param[1]);
537
538 return gic_irq_domain_map(d, virq, hwirq);
539}
540
541void gic_irq_domain_free(struct irq_domain *d, unsigned int virq,
542 unsigned int nr_irqs)
543{
544}
545
546static const struct irq_domain_ops gic_irq_domain_ops = {
547 .xlate = gic_irq_domain_xlate,
548 .alloc = gic_irq_domain_alloc,
549 .free = gic_irq_domain_free,
550 .map = gic_irq_domain_map,
551};
552
553static int gic_ipi_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
554 const u32 *intspec, unsigned int intsize,
555 irq_hw_number_t *out_hwirq,
556 unsigned int *out_type)
557{
558 /*
559 * There's nothing to translate here. hwirq is dynamically allocated and
560 * the irq type is always edge triggered.
561 * */
562 *out_hwirq = 0;
563 *out_type = IRQ_TYPE_EDGE_RISING;
564
565 return 0;
566}
567
568static int gic_ipi_domain_alloc(struct irq_domain *d, unsigned int virq,
569 unsigned int nr_irqs, void *arg)
570{
571 struct cpumask *ipimask = arg;
572 irq_hw_number_t hwirq, base_hwirq;
573 int cpu, ret, i;
574
575 base_hwirq = find_first_bit(ipi_available, gic_shared_intrs);
576 if (base_hwirq == gic_shared_intrs)
577 return -ENOMEM;
578
579 /* check that we have enough space */
580 for (i = base_hwirq; i < nr_irqs; i++) {
581 if (!test_bit(i, ipi_available))
582 return -EBUSY;
583 }
584 bitmap_clear(ipi_available, base_hwirq, nr_irqs);
585
586 /* map the hwirq for each cpu consecutively */
587 i = 0;
588 for_each_cpu(cpu, ipimask) {
589 hwirq = GIC_SHARED_TO_HWIRQ(base_hwirq + i);
590
591 ret = irq_domain_set_hwirq_and_chip(d, virq + i, hwirq,
592 &gic_edge_irq_controller,
593 NULL);
594 if (ret)
595 goto error;
596
597 ret = irq_domain_set_hwirq_and_chip(d->parent, virq + i, hwirq,
598 &gic_edge_irq_controller,
599 NULL);
600 if (ret)
601 goto error;
602
603 ret = irq_set_irq_type(virq + i, IRQ_TYPE_EDGE_RISING);
604 if (ret)
605 goto error;
606
607 ret = gic_shared_irq_domain_map(d, virq + i, hwirq, cpu);
608 if (ret)
609 goto error;
610
611 i++;
612 }
613
614 return 0;
615error:
616 bitmap_set(ipi_available, base_hwirq, nr_irqs);
617 return ret;
618}
619
620static void gic_ipi_domain_free(struct irq_domain *d, unsigned int virq,
621 unsigned int nr_irqs)
622{
623 irq_hw_number_t base_hwirq;
624 struct irq_data *data;
625
626 data = irq_get_irq_data(virq);
627 if (!data)
628 return;
629
630 base_hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(data));
631 bitmap_set(ipi_available, base_hwirq, nr_irqs);
632}
633
634static int gic_ipi_domain_match(struct irq_domain *d, struct device_node *node,
635 enum irq_domain_bus_token bus_token)
636{
637 bool is_ipi;
638
639 switch (bus_token) {
640 case DOMAIN_BUS_IPI:
641 is_ipi = d->bus_token == bus_token;
642 return (!node || to_of_node(d->fwnode) == node) && is_ipi;
643 break;
644 default:
645 return 0;
646 }
647}
648
649static const struct irq_domain_ops gic_ipi_domain_ops = {
650 .xlate = gic_ipi_domain_xlate,
651 .alloc = gic_ipi_domain_alloc,
652 .free = gic_ipi_domain_free,
653 .match = gic_ipi_domain_match,
654};
655
656static int gic_cpu_startup(unsigned int cpu)
657{
658 /* Enable or disable EIC */
659 change_gic_vl_ctl(GIC_VX_CTL_EIC,
660 cpu_has_veic ? GIC_VX_CTL_EIC : 0);
661
662 /* Clear all local IRQ masks (ie. disable all local interrupts) */
663 write_gic_vl_rmask(~0);
664
665 /* Invoke irq_cpu_online callbacks to enable desired interrupts */
666 irq_cpu_online();
667
668 return 0;
669}
670
671static int __init gic_of_init(struct device_node *node,
672 struct device_node *parent)
673{
674 unsigned int cpu_vec, i, gicconfig, v[2], num_ipis;
675 unsigned long reserved;
676 phys_addr_t gic_base;
677 struct resource res;
678 size_t gic_len;
679
680 /* Find the first available CPU vector. */
681 i = 0;
682 reserved = (C_SW0 | C_SW1) >> __ffs(C_SW0);
683 while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors",
684 i++, &cpu_vec))
685 reserved |= BIT(cpu_vec);
686
687 cpu_vec = find_first_zero_bit(&reserved, hweight_long(ST0_IM));
688 if (cpu_vec == hweight_long(ST0_IM)) {
689 pr_err("No CPU vectors available\n");
690 return -ENODEV;
691 }
692
693 if (of_address_to_resource(node, 0, &res)) {
694 /*
695 * Probe the CM for the GIC base address if not specified
696 * in the device-tree.
697 */
698 if (mips_cm_present()) {
699 gic_base = read_gcr_gic_base() &
700 ~CM_GCR_GIC_BASE_GICEN;
701 gic_len = 0x20000;
702 pr_warn("Using inherited base address %pa\n",
703 &gic_base);
704 } else {
705 pr_err("Failed to get memory range\n");
706 return -ENODEV;
707 }
708 } else {
709 gic_base = res.start;
710 gic_len = resource_size(&res);
711 }
712
713 if (mips_cm_present()) {
714 write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN);
715 /* Ensure GIC region is enabled before trying to access it */
716 __sync();
717 }
718
719 mips_gic_base = ioremap(gic_base, gic_len);
720
721 gicconfig = read_gic_config();
722 gic_shared_intrs = gicconfig & GIC_CONFIG_NUMINTERRUPTS;
723 gic_shared_intrs >>= __ffs(GIC_CONFIG_NUMINTERRUPTS);
724 gic_shared_intrs = (gic_shared_intrs + 1) * 8;
725
726 if (cpu_has_veic) {
727 /* Always use vector 1 in EIC mode */
728 gic_cpu_pin = 0;
729 timer_cpu_pin = gic_cpu_pin;
730 set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
731 __gic_irq_dispatch);
732 } else {
733 gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
734 irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec,
735 gic_irq_dispatch);
736 /*
737 * With the CMP implementation of SMP (deprecated), other CPUs
738 * are started by the bootloader and put into a timer based
739 * waiting poll loop. We must not re-route those CPU's local
740 * timer interrupts as the wait instruction will never finish,
741 * so just handle whatever CPU interrupt it is routed to by
742 * default.
743 *
744 * This workaround should be removed when CMP support is
745 * dropped.
746 */
747 if (IS_ENABLED(CONFIG_MIPS_CMP) &&
748 gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) {
749 timer_cpu_pin = read_gic_vl_timer_map() & GIC_MAP_PIN_MAP;
750 irq_set_chained_handler(MIPS_CPU_IRQ_BASE +
751 GIC_CPU_PIN_OFFSET +
752 timer_cpu_pin,
753 gic_irq_dispatch);
754 } else {
755 timer_cpu_pin = gic_cpu_pin;
756 }
757 }
758
759 gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS +
760 gic_shared_intrs, 0,
761 &gic_irq_domain_ops, NULL);
762 if (!gic_irq_domain) {
763 pr_err("Failed to add IRQ domain");
764 return -ENXIO;
765 }
766
767 gic_ipi_domain = irq_domain_add_hierarchy(gic_irq_domain,
768 IRQ_DOMAIN_FLAG_IPI_PER_CPU,
769 GIC_NUM_LOCAL_INTRS + gic_shared_intrs,
770 node, &gic_ipi_domain_ops, NULL);
771 if (!gic_ipi_domain) {
772 pr_err("Failed to add IPI domain");
773 return -ENXIO;
774 }
775
776 irq_domain_update_bus_token(gic_ipi_domain, DOMAIN_BUS_IPI);
777
778 if (node &&
779 !of_property_read_u32_array(node, "mti,reserved-ipi-vectors", v, 2)) {
780 bitmap_set(ipi_resrv, v[0], v[1]);
781 } else {
782 /*
783 * Reserve 2 interrupts per possible CPU/VP for use as IPIs,
784 * meeting the requirements of arch/mips SMP.
785 */
786 num_ipis = 2 * num_possible_cpus();
787 bitmap_set(ipi_resrv, gic_shared_intrs - num_ipis, num_ipis);
788 }
789
790 bitmap_copy(ipi_available, ipi_resrv, GIC_MAX_INTRS);
791
792 board_bind_eic_interrupt = &gic_bind_eic_interrupt;
793
794 /* Setup defaults */
795 for (i = 0; i < gic_shared_intrs; i++) {
796 change_gic_pol(i, GIC_POL_ACTIVE_HIGH);
797 change_gic_trig(i, GIC_TRIG_LEVEL);
798 write_gic_rmask(i);
799 }
800
801 return cpuhp_setup_state(CPUHP_AP_IRQ_MIPS_GIC_STARTING,
802 "irqchip/mips/gic:starting",
803 gic_cpu_startup, NULL);
804}
805IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);