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-rw-r--r--drivers/irqchip/irq-mips-gic.c789
1 files changed, 789 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
new file mode 100644
index 000000000000..2b0468e3df6a
--- /dev/null
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -0,0 +1,789 @@
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
27unsigned int gic_present;
28
29struct gic_pcpu_mask {
30 DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS);
31};
32
33static void __iomem *gic_base;
34static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
35static DEFINE_SPINLOCK(gic_lock);
36static struct irq_domain *gic_irq_domain;
37static int gic_shared_intrs;
38static int gic_vpes;
39static unsigned int gic_cpu_pin;
40static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
41
42static void __gic_irq_dispatch(void);
43
44static inline unsigned int gic_read(unsigned int reg)
45{
46 return __raw_readl(gic_base + reg);
47}
48
49static inline void gic_write(unsigned int reg, unsigned int val)
50{
51 __raw_writel(val, gic_base + reg);
52}
53
54static inline void gic_update_bits(unsigned int reg, unsigned int mask,
55 unsigned int val)
56{
57 unsigned int regval;
58
59 regval = gic_read(reg);
60 regval &= ~mask;
61 regval |= val;
62 gic_write(reg, regval);
63}
64
65static inline void gic_reset_mask(unsigned int intr)
66{
67 gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr),
68 1 << GIC_INTR_BIT(intr));
69}
70
71static inline void gic_set_mask(unsigned int intr)
72{
73 gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr),
74 1 << GIC_INTR_BIT(intr));
75}
76
77static inline void gic_set_polarity(unsigned int intr, unsigned int pol)
78{
79 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) +
80 GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr),
81 pol << GIC_INTR_BIT(intr));
82}
83
84static inline void gic_set_trigger(unsigned int intr, unsigned int trig)
85{
86 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) +
87 GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr),
88 trig << GIC_INTR_BIT(intr));
89}
90
91static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual)
92{
93 gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr),
94 1 << GIC_INTR_BIT(intr),
95 dual << GIC_INTR_BIT(intr));
96}
97
98static inline void gic_map_to_pin(unsigned int intr, unsigned int pin)
99{
100 gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) +
101 GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin);
102}
103
104static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe)
105{
106 gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) +
107 GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe),
108 GIC_SH_MAP_TO_VPE_REG_BIT(vpe));
109}
110
111#ifdef CONFIG_CLKSRC_MIPS_GIC
112cycle_t gic_read_count(void)
113{
114 unsigned int hi, hi2, lo;
115
116 do {
117 hi = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
118 lo = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_31_00));
119 hi2 = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
120 } while (hi2 != hi);
121
122 return (((cycle_t) hi) << 32) + lo;
123}
124
125unsigned int gic_get_count_width(void)
126{
127 unsigned int bits, config;
128
129 config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
130 bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
131 GIC_SH_CONFIG_COUNTBITS_SHF);
132
133 return bits;
134}
135
136void gic_write_compare(cycle_t cnt)
137{
138 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
139 (int)(cnt >> 32));
140 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
141 (int)(cnt & 0xffffffff));
142}
143
144void gic_write_cpu_compare(cycle_t cnt, int cpu)
145{
146 unsigned long flags;
147
148 local_irq_save(flags);
149
150 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu);
151 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI),
152 (int)(cnt >> 32));
153 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO),
154 (int)(cnt & 0xffffffff));
155
156 local_irq_restore(flags);
157}
158
159cycle_t gic_read_compare(void)
160{
161 unsigned int hi, lo;
162
163 hi = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI));
164 lo = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO));
165
166 return (((cycle_t) hi) << 32) + lo;
167}
168#endif
169
170static bool gic_local_irq_is_routable(int intr)
171{
172 u32 vpe_ctl;
173
174 /* All local interrupts are routable in EIC mode. */
175 if (cpu_has_veic)
176 return true;
177
178 vpe_ctl = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_CTL));
179 switch (intr) {
180 case GIC_LOCAL_INT_TIMER:
181 return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK;
182 case GIC_LOCAL_INT_PERFCTR:
183 return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK;
184 case GIC_LOCAL_INT_FDC:
185 return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK;
186 case GIC_LOCAL_INT_SWINT0:
187 case GIC_LOCAL_INT_SWINT1:
188 return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK;
189 default:
190 return true;
191 }
192}
193
194unsigned int gic_get_timer_pending(void)
195{
196 unsigned int vpe_pending;
197
198 vpe_pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
199 return vpe_pending & GIC_VPE_PEND_TIMER_MSK;
200}
201
202static void gic_bind_eic_interrupt(int irq, int set)
203{
204 /* Convert irq vector # to hw int # */
205 irq -= GIC_PIN_TO_VEC_OFFSET;
206
207 /* Set irq to use shadow set */
208 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) +
209 GIC_VPE_EIC_SS(irq), set);
210}
211
212void gic_send_ipi(unsigned int intr)
213{
214 gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(intr));
215}
216
217int gic_get_c0_compare_int(void)
218{
219 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER))
220 return MIPS_CPU_IRQ_BASE + cp0_compare_irq;
221 return irq_create_mapping(gic_irq_domain,
222 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER));
223}
224
225int gic_get_c0_perfcount_int(void)
226{
227 if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) {
228 /* Is the erformance counter shared with the timer? */
229 if (cp0_perfcount_irq < 0)
230 return -1;
231 return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
232 }
233 return irq_create_mapping(gic_irq_domain,
234 GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR));
235}
236
237static unsigned int gic_get_int(void)
238{
239 unsigned int i;
240 unsigned long *pcpu_mask;
241 unsigned long pending_reg, intrmask_reg;
242 DECLARE_BITMAP(pending, GIC_MAX_INTRS);
243 DECLARE_BITMAP(intrmask, GIC_MAX_INTRS);
244
245 /* Get per-cpu bitmaps */
246 pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
247
248 pending_reg = GIC_REG(SHARED, GIC_SH_PEND);
249 intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK);
250
251 for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) {
252 pending[i] = gic_read(pending_reg);
253 intrmask[i] = gic_read(intrmask_reg);
254 pending_reg += 0x4;
255 intrmask_reg += 0x4;
256 }
257
258 bitmap_and(pending, pending, intrmask, gic_shared_intrs);
259 bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs);
260
261 return find_first_bit(pending, gic_shared_intrs);
262}
263
264static void gic_mask_irq(struct irq_data *d)
265{
266 gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
267}
268
269static void gic_unmask_irq(struct irq_data *d)
270{
271 gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
272}
273
274static void gic_ack_irq(struct irq_data *d)
275{
276 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
277
278 gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq));
279}
280
281static int gic_set_type(struct irq_data *d, unsigned int type)
282{
283 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
284 unsigned long flags;
285 bool is_edge;
286
287 spin_lock_irqsave(&gic_lock, flags);
288 switch (type & IRQ_TYPE_SENSE_MASK) {
289 case IRQ_TYPE_EDGE_FALLING:
290 gic_set_polarity(irq, GIC_POL_NEG);
291 gic_set_trigger(irq, GIC_TRIG_EDGE);
292 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
293 is_edge = true;
294 break;
295 case IRQ_TYPE_EDGE_RISING:
296 gic_set_polarity(irq, GIC_POL_POS);
297 gic_set_trigger(irq, GIC_TRIG_EDGE);
298 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
299 is_edge = true;
300 break;
301 case IRQ_TYPE_EDGE_BOTH:
302 /* polarity is irrelevant in this case */
303 gic_set_trigger(irq, GIC_TRIG_EDGE);
304 gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE);
305 is_edge = true;
306 break;
307 case IRQ_TYPE_LEVEL_LOW:
308 gic_set_polarity(irq, GIC_POL_NEG);
309 gic_set_trigger(irq, GIC_TRIG_LEVEL);
310 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
311 is_edge = false;
312 break;
313 case IRQ_TYPE_LEVEL_HIGH:
314 default:
315 gic_set_polarity(irq, GIC_POL_POS);
316 gic_set_trigger(irq, GIC_TRIG_LEVEL);
317 gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
318 is_edge = false;
319 break;
320 }
321
322 if (is_edge) {
323 __irq_set_chip_handler_name_locked(d->irq,
324 &gic_edge_irq_controller,
325 handle_edge_irq, NULL);
326 } else {
327 __irq_set_chip_handler_name_locked(d->irq,
328 &gic_level_irq_controller,
329 handle_level_irq, NULL);
330 }
331 spin_unlock_irqrestore(&gic_lock, flags);
332
333 return 0;
334}
335
336#ifdef CONFIG_SMP
337static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
338 bool force)
339{
340 unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
341 cpumask_t tmp = CPU_MASK_NONE;
342 unsigned long flags;
343 int i;
344
345 cpumask_and(&tmp, cpumask, cpu_online_mask);
346 if (cpus_empty(tmp))
347 return -EINVAL;
348
349 /* Assumption : cpumask refers to a single CPU */
350 spin_lock_irqsave(&gic_lock, flags);
351
352 /* Re-route this IRQ */
353 gic_map_to_vpe(irq, first_cpu(tmp));
354
355 /* Update the pcpu_masks */
356 for (i = 0; i < NR_CPUS; i++)
357 clear_bit(irq, pcpu_masks[i].pcpu_mask);
358 set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask);
359
360 cpumask_copy(d->affinity, cpumask);
361 spin_unlock_irqrestore(&gic_lock, flags);
362
363 return IRQ_SET_MASK_OK_NOCOPY;
364}
365#endif
366
367static struct irq_chip gic_level_irq_controller = {
368 .name = "MIPS GIC",
369 .irq_mask = gic_mask_irq,
370 .irq_unmask = gic_unmask_irq,
371 .irq_set_type = gic_set_type,
372#ifdef CONFIG_SMP
373 .irq_set_affinity = gic_set_affinity,
374#endif
375};
376
377static struct irq_chip gic_edge_irq_controller = {
378 .name = "MIPS GIC",
379 .irq_ack = gic_ack_irq,
380 .irq_mask = gic_mask_irq,
381 .irq_unmask = gic_unmask_irq,
382 .irq_set_type = gic_set_type,
383#ifdef CONFIG_SMP
384 .irq_set_affinity = gic_set_affinity,
385#endif
386};
387
388static unsigned int gic_get_local_int(void)
389{
390 unsigned long pending, masked;
391
392 pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
393 masked = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_MASK));
394
395 bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS);
396
397 return find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
398}
399
400static void gic_mask_local_irq(struct irq_data *d)
401{
402 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
403
404 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr);
405}
406
407static void gic_unmask_local_irq(struct irq_data *d)
408{
409 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
410
411 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr);
412}
413
414static struct irq_chip gic_local_irq_controller = {
415 .name = "MIPS GIC Local",
416 .irq_mask = gic_mask_local_irq,
417 .irq_unmask = gic_unmask_local_irq,
418};
419
420static void gic_mask_local_irq_all_vpes(struct irq_data *d)
421{
422 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
423 int i;
424 unsigned long flags;
425
426 spin_lock_irqsave(&gic_lock, flags);
427 for (i = 0; i < gic_vpes; i++) {
428 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
429 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr);
430 }
431 spin_unlock_irqrestore(&gic_lock, flags);
432}
433
434static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
435{
436 int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
437 int i;
438 unsigned long flags;
439
440 spin_lock_irqsave(&gic_lock, flags);
441 for (i = 0; i < gic_vpes; i++) {
442 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
443 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr);
444 }
445 spin_unlock_irqrestore(&gic_lock, flags);
446}
447
448static struct irq_chip gic_all_vpes_local_irq_controller = {
449 .name = "MIPS GIC Local",
450 .irq_mask = gic_mask_local_irq_all_vpes,
451 .irq_unmask = gic_unmask_local_irq_all_vpes,
452};
453
454static void __gic_irq_dispatch(void)
455{
456 unsigned int intr, virq;
457
458 while ((intr = gic_get_local_int()) != GIC_NUM_LOCAL_INTRS) {
459 virq = irq_linear_revmap(gic_irq_domain,
460 GIC_LOCAL_TO_HWIRQ(intr));
461 do_IRQ(virq);
462 }
463
464 while ((intr = gic_get_int()) != gic_shared_intrs) {
465 virq = irq_linear_revmap(gic_irq_domain,
466 GIC_SHARED_TO_HWIRQ(intr));
467 do_IRQ(virq);
468 }
469}
470
471static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc)
472{
473 __gic_irq_dispatch();
474}
475
476#ifdef CONFIG_MIPS_GIC_IPI
477static int gic_resched_int_base;
478static int gic_call_int_base;
479
480unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
481{
482 return gic_resched_int_base + cpu;
483}
484
485unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
486{
487 return gic_call_int_base + cpu;
488}
489
490static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
491{
492 scheduler_ipi();
493
494 return IRQ_HANDLED;
495}
496
497static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
498{
499 smp_call_function_interrupt();
500
501 return IRQ_HANDLED;
502}
503
504static struct irqaction irq_resched = {
505 .handler = ipi_resched_interrupt,
506 .flags = IRQF_PERCPU,
507 .name = "IPI resched"
508};
509
510static struct irqaction irq_call = {
511 .handler = ipi_call_interrupt,
512 .flags = IRQF_PERCPU,
513 .name = "IPI call"
514};
515
516static __init void gic_ipi_init_one(unsigned int intr, int cpu,
517 struct irqaction *action)
518{
519 int virq = irq_create_mapping(gic_irq_domain,
520 GIC_SHARED_TO_HWIRQ(intr));
521 int i;
522
523 gic_map_to_vpe(intr, cpu);
524 for (i = 0; i < NR_CPUS; i++)
525 clear_bit(intr, pcpu_masks[i].pcpu_mask);
526 set_bit(intr, pcpu_masks[cpu].pcpu_mask);
527
528 irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING);
529
530 irq_set_handler(virq, handle_percpu_irq);
531 setup_irq(virq, action);
532}
533
534static __init void gic_ipi_init(void)
535{
536 int i;
537
538 /* Use last 2 * NR_CPUS interrupts as IPIs */
539 gic_resched_int_base = gic_shared_intrs - nr_cpu_ids;
540 gic_call_int_base = gic_resched_int_base - nr_cpu_ids;
541
542 for (i = 0; i < nr_cpu_ids; i++) {
543 gic_ipi_init_one(gic_call_int_base + i, i, &irq_call);
544 gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched);
545 }
546}
547#else
548static inline void gic_ipi_init(void)
549{
550}
551#endif
552
553static void __init gic_basic_init(void)
554{
555 unsigned int i;
556
557 board_bind_eic_interrupt = &gic_bind_eic_interrupt;
558
559 /* Setup defaults */
560 for (i = 0; i < gic_shared_intrs; i++) {
561 gic_set_polarity(i, GIC_POL_POS);
562 gic_set_trigger(i, GIC_TRIG_LEVEL);
563 gic_reset_mask(i);
564 }
565
566 for (i = 0; i < gic_vpes; i++) {
567 unsigned int j;
568
569 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
570 for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) {
571 if (!gic_local_irq_is_routable(j))
572 continue;
573 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j);
574 }
575 }
576}
577
578static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq,
579 irq_hw_number_t hw)
580{
581 int intr = GIC_HWIRQ_TO_LOCAL(hw);
582 int ret = 0;
583 int i;
584 unsigned long flags;
585
586 if (!gic_local_irq_is_routable(intr))
587 return -EPERM;
588
589 /*
590 * HACK: These are all really percpu interrupts, but the rest
591 * of the MIPS kernel code does not use the percpu IRQ API for
592 * the CP0 timer and performance counter interrupts.
593 */
594 if (intr != GIC_LOCAL_INT_TIMER && intr != GIC_LOCAL_INT_PERFCTR) {
595 irq_set_chip_and_handler(virq,
596 &gic_local_irq_controller,
597 handle_percpu_devid_irq);
598 irq_set_percpu_devid(virq);
599 } else {
600 irq_set_chip_and_handler(virq,
601 &gic_all_vpes_local_irq_controller,
602 handle_percpu_irq);
603 }
604
605 spin_lock_irqsave(&gic_lock, flags);
606 for (i = 0; i < gic_vpes; i++) {
607 u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin;
608
609 gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
610
611 switch (intr) {
612 case GIC_LOCAL_INT_WD:
613 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val);
614 break;
615 case GIC_LOCAL_INT_COMPARE:
616 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP), val);
617 break;
618 case GIC_LOCAL_INT_TIMER:
619 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP), val);
620 break;
621 case GIC_LOCAL_INT_PERFCTR:
622 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP), val);
623 break;
624 case GIC_LOCAL_INT_SWINT0:
625 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP), val);
626 break;
627 case GIC_LOCAL_INT_SWINT1:
628 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP), val);
629 break;
630 case GIC_LOCAL_INT_FDC:
631 gic_write(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val);
632 break;
633 default:
634 pr_err("Invalid local IRQ %d\n", intr);
635 ret = -EINVAL;
636 break;
637 }
638 }
639 spin_unlock_irqrestore(&gic_lock, flags);
640
641 return ret;
642}
643
644static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
645 irq_hw_number_t hw)
646{
647 int intr = GIC_HWIRQ_TO_SHARED(hw);
648 unsigned long flags;
649
650 irq_set_chip_and_handler(virq, &gic_level_irq_controller,
651 handle_level_irq);
652
653 spin_lock_irqsave(&gic_lock, flags);
654 gic_map_to_pin(intr, gic_cpu_pin);
655 /* Map to VPE 0 by default */
656 gic_map_to_vpe(intr, 0);
657 set_bit(intr, pcpu_masks[0].pcpu_mask);
658 spin_unlock_irqrestore(&gic_lock, flags);
659
660 return 0;
661}
662
663static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
664 irq_hw_number_t hw)
665{
666 if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS)
667 return gic_local_irq_domain_map(d, virq, hw);
668 return gic_shared_irq_domain_map(d, virq, hw);
669}
670
671static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
672 const u32 *intspec, unsigned int intsize,
673 irq_hw_number_t *out_hwirq,
674 unsigned int *out_type)
675{
676 if (intsize != 3)
677 return -EINVAL;
678
679 if (intspec[0] == GIC_SHARED)
680 *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]);
681 else if (intspec[0] == GIC_LOCAL)
682 *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]);
683 else
684 return -EINVAL;
685 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
686
687 return 0;
688}
689
690static struct irq_domain_ops gic_irq_domain_ops = {
691 .map = gic_irq_domain_map,
692 .xlate = gic_irq_domain_xlate,
693};
694
695static void __init __gic_init(unsigned long gic_base_addr,
696 unsigned long gic_addrspace_size,
697 unsigned int cpu_vec, unsigned int irqbase,
698 struct device_node *node)
699{
700 unsigned int gicconfig;
701
702 gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
703
704 gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
705 gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
706 GIC_SH_CONFIG_NUMINTRS_SHF;
707 gic_shared_intrs = ((gic_shared_intrs + 1) * 8);
708
709 gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
710 GIC_SH_CONFIG_NUMVPES_SHF;
711 gic_vpes = gic_vpes + 1;
712
713 if (cpu_has_veic) {
714 /* Always use vector 1 in EIC mode */
715 gic_cpu_pin = 0;
716 set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
717 __gic_irq_dispatch);
718 } else {
719 gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
720 irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec,
721 gic_irq_dispatch);
722 }
723
724 gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS +
725 gic_shared_intrs, irqbase,
726 &gic_irq_domain_ops, NULL);
727 if (!gic_irq_domain)
728 panic("Failed to add GIC IRQ domain");
729
730 gic_basic_init();
731
732 gic_ipi_init();
733}
734
735void __init gic_init(unsigned long gic_base_addr,
736 unsigned long gic_addrspace_size,
737 unsigned int cpu_vec, unsigned int irqbase)
738{
739 __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL);
740}
741
742static int __init gic_of_init(struct device_node *node,
743 struct device_node *parent)
744{
745 struct resource res;
746 unsigned int cpu_vec, i = 0, reserved = 0;
747 phys_addr_t gic_base;
748 size_t gic_len;
749
750 /* Find the first available CPU vector. */
751 while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors",
752 i++, &cpu_vec))
753 reserved |= BIT(cpu_vec);
754 for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) {
755 if (!(reserved & BIT(cpu_vec)))
756 break;
757 }
758 if (cpu_vec == 8) {
759 pr_err("No CPU vectors available for GIC\n");
760 return -ENODEV;
761 }
762
763 if (of_address_to_resource(node, 0, &res)) {
764 /*
765 * Probe the CM for the GIC base address if not specified
766 * in the device-tree.
767 */
768 if (mips_cm_present()) {
769 gic_base = read_gcr_gic_base() &
770 ~CM_GCR_GIC_BASE_GICEN_MSK;
771 gic_len = 0x20000;
772 } else {
773 pr_err("Failed to get GIC memory range\n");
774 return -ENODEV;
775 }
776 } else {
777 gic_base = res.start;
778 gic_len = resource_size(&res);
779 }
780
781 if (mips_cm_present())
782 write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK);
783 gic_present = true;
784
785 __gic_init(gic_base, gic_len, cpu_vec, 0, node);
786
787 return 0;
788}
789IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);
generated by cgit v1.2.2 (git 2.25.0) at 2025-05-31 07:22:57 -0400