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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
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
49DEFINE_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(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 /* fall-through */
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(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
620void 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
634int 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_nocache(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);
806

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