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1/*
2 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Interrupt architecture for the GIC:
9 *
10 * o There is one Interrupt Distributor, which receives interrupts
11 * from system devices and sends them to the Interrupt Controllers.
12 *
13 * o There is one CPU Interface per CPU, which sends interrupts sent
14 * by the Distributor, and interrupts generated locally, to the
15 * associated CPU. The base address of the CPU interface is usually
16 * aliased so that the same address points to different chips depending
17 * on the CPU it is accessed from.
18 *
19 * Note that IRQs 0-31 are special - they are local to each CPU.
20 * As such, the enable set/clear, pending set/clear and active bit
21 * registers are banked per-cpu for these sources.
22 */
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/err.h>
26#include <linux/module.h>
27#include <linux/list.h>
28#include <linux/smp.h>
29#include <linux/cpu.h>
30#include <linux/cpu_pm.h>
31#include <linux/cpumask.h>
32#include <linux/io.h>
33#include <linux/of.h>
34#include <linux/of_address.h>
35#include <linux/of_irq.h>
36#include <linux/acpi.h>
37#include <linux/irqdomain.h>
38#include <linux/interrupt.h>
39#include <linux/percpu.h>
40#include <linux/slab.h>
41#include <linux/irqchip.h>
42#include <linux/irqchip/chained_irq.h>
43#include <linux/irqchip/arm-gic.h>
44
45#include <asm/cputype.h>
46#include <asm/irq.h>
47#include <asm/exception.h>
48#include <asm/smp_plat.h>
49#include <asm/virt.h>
50
51#include "irq-gic-common.h"
52
53#ifdef CONFIG_ARM64
54#include <asm/cpufeature.h>
55
56static void gic_check_cpu_features(void)
57{
58 WARN_TAINT_ONCE(cpus_have_cap(ARM64_HAS_SYSREG_GIC_CPUIF),
59 TAINT_CPU_OUT_OF_SPEC,
60 "GICv3 system registers enabled, broken firmware!\n");
61}
62#else
63#define gic_check_cpu_features() do { } while(0)
64#endif
65
66union gic_base {
67 void __iomem *common_base;
68 void __percpu * __iomem *percpu_base;
69};
70
71struct gic_chip_data {
72 struct irq_chip chip;
73 union gic_base dist_base;
74 union gic_base cpu_base;
75#ifdef CONFIG_CPU_PM
76 u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
77 u32 saved_spi_active[DIV_ROUND_UP(1020, 32)];
78 u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
79 u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
80 u32 __percpu *saved_ppi_enable;
81 u32 __percpu *saved_ppi_active;
82 u32 __percpu *saved_ppi_conf;
83#endif
84 struct irq_domain *domain;
85 unsigned int gic_irqs;
86#ifdef CONFIG_GIC_NON_BANKED
87 void __iomem *(*get_base)(union gic_base *);
88#endif
89};
90
91static DEFINE_RAW_SPINLOCK(irq_controller_lock);
92
93/*
94 * The GIC mapping of CPU interfaces does not necessarily match
95 * the logical CPU numbering. Let's use a mapping as returned
96 * by the GIC itself.
97 */
98#define NR_GIC_CPU_IF 8
99static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
100
101static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
102
103static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly;
104
105#ifdef CONFIG_GIC_NON_BANKED
106static void __iomem *gic_get_percpu_base(union gic_base *base)
107{
108 return raw_cpu_read(*base->percpu_base);
109}
110
111static void __iomem *gic_get_common_base(union gic_base *base)
112{
113 return base->common_base;
114}
115
116static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
117{
118 return data->get_base(&data->dist_base);
119}
120
121static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
122{
123 return data->get_base(&data->cpu_base);
124}
125
126static inline void gic_set_base_accessor(struct gic_chip_data *data,
127 void __iomem *(*f)(union gic_base *))
128{
129 data->get_base = f;
130}
131#else
132#define gic_data_dist_base(d) ((d)->dist_base.common_base)
133#define gic_data_cpu_base(d) ((d)->cpu_base.common_base)
134#define gic_set_base_accessor(d, f)
135#endif
136
137static inline void __iomem *gic_dist_base(struct irq_data *d)
138{
139 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
140 return gic_data_dist_base(gic_data);
141}
142
143static inline void __iomem *gic_cpu_base(struct irq_data *d)
144{
145 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
146 return gic_data_cpu_base(gic_data);
147}
148
149static inline unsigned int gic_irq(struct irq_data *d)
150{
151 return d->hwirq;
152}
153
154static inline bool cascading_gic_irq(struct irq_data *d)
155{
156 void *data = irq_data_get_irq_handler_data(d);
157
158 /*
159 * If handler_data is set, this is a cascading interrupt, and
160 * it cannot possibly be forwarded.
161 */
162 return data != NULL;
163}
164
165/*
166 * Routines to acknowledge, disable and enable interrupts
167 */
168static void gic_poke_irq(struct irq_data *d, u32 offset)
169{
170 u32 mask = 1 << (gic_irq(d) % 32);
171 writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4);
172}
173
174static int gic_peek_irq(struct irq_data *d, u32 offset)
175{
176 u32 mask = 1 << (gic_irq(d) % 32);
177 return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask);
178}
179
180static void gic_mask_irq(struct irq_data *d)
181{
182 gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR);
183}
184
185static void gic_eoimode1_mask_irq(struct irq_data *d)
186{
187 gic_mask_irq(d);
188 /*
189 * When masking a forwarded interrupt, make sure it is
190 * deactivated as well.
191 *
192 * This ensures that an interrupt that is getting
193 * disabled/masked will not get "stuck", because there is
194 * noone to deactivate it (guest is being terminated).
195 */
196 if (irqd_is_forwarded_to_vcpu(d))
197 gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR);
198}
199
200static void gic_unmask_irq(struct irq_data *d)
201{
202 gic_poke_irq(d, GIC_DIST_ENABLE_SET);
203}
204
205static void gic_eoi_irq(struct irq_data *d)
206{
207 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
208}
209
210static void gic_eoimode1_eoi_irq(struct irq_data *d)
211{
212 /* Do not deactivate an IRQ forwarded to a vcpu. */
213 if (irqd_is_forwarded_to_vcpu(d))
214 return;
215
216 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
217}
218
219static int gic_irq_set_irqchip_state(struct irq_data *d,
220 enum irqchip_irq_state which, bool val)
221{
222 u32 reg;
223
224 switch (which) {
225 case IRQCHIP_STATE_PENDING:
226 reg = val ? GIC_DIST_PENDING_SET : GIC_DIST_PENDING_CLEAR;
227 break;
228
229 case IRQCHIP_STATE_ACTIVE:
230 reg = val ? GIC_DIST_ACTIVE_SET : GIC_DIST_ACTIVE_CLEAR;
231 break;
232
233 case IRQCHIP_STATE_MASKED:
234 reg = val ? GIC_DIST_ENABLE_CLEAR : GIC_DIST_ENABLE_SET;
235 break;
236
237 default:
238 return -EINVAL;
239 }
240
241 gic_poke_irq(d, reg);
242 return 0;
243}
244
245static int gic_irq_get_irqchip_state(struct irq_data *d,
246 enum irqchip_irq_state which, bool *val)
247{
248 switch (which) {
249 case IRQCHIP_STATE_PENDING:
250 *val = gic_peek_irq(d, GIC_DIST_PENDING_SET);
251 break;
252
253 case IRQCHIP_STATE_ACTIVE:
254 *val = gic_peek_irq(d, GIC_DIST_ACTIVE_SET);
255 break;
256
257 case IRQCHIP_STATE_MASKED:
258 *val = !gic_peek_irq(d, GIC_DIST_ENABLE_SET);
259 break;
260
261 default:
262 return -EINVAL;
263 }
264
265 return 0;
266}
267
268static int gic_set_type(struct irq_data *d, unsigned int type)
269{
270 void __iomem *base = gic_dist_base(d);
271 unsigned int gicirq = gic_irq(d);
272
273 /* Interrupt configuration for SGIs can't be changed */
274 if (gicirq < 16)
275 return -EINVAL;
276
277 /* SPIs have restrictions on the supported types */
278 if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
279 type != IRQ_TYPE_EDGE_RISING)
280 return -EINVAL;
281
282 return gic_configure_irq(gicirq, type, base, NULL);
283}
284
285static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
286{
287 /* Only interrupts on the primary GIC can be forwarded to a vcpu. */
288 if (cascading_gic_irq(d))
289 return -EINVAL;
290
291 if (vcpu)
292 irqd_set_forwarded_to_vcpu(d);
293 else
294 irqd_clr_forwarded_to_vcpu(d);
295 return 0;
296}
297
298#ifdef CONFIG_SMP
299static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
300 bool force)
301{
302 void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
303 unsigned int cpu, shift = (gic_irq(d) % 4) * 8;
304 u32 val, mask, bit;
305 unsigned long flags;
306
307 if (!force)
308 cpu = cpumask_any_and(mask_val, cpu_online_mask);
309 else
310 cpu = cpumask_first(mask_val);
311
312 if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
313 return -EINVAL;
314
315 raw_spin_lock_irqsave(&irq_controller_lock, flags);
316 mask = 0xff << shift;
317 bit = gic_cpu_map[cpu] << shift;
318 val = readl_relaxed(reg) & ~mask;
319 writel_relaxed(val | bit, reg);
320 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
321
322 return IRQ_SET_MASK_OK_DONE;
323}
324#endif
325
326static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
327{
328 u32 irqstat, irqnr;
329 struct gic_chip_data *gic = &gic_data[0];
330 void __iomem *cpu_base = gic_data_cpu_base(gic);
331
332 do {
333 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
334 irqnr = irqstat & GICC_IAR_INT_ID_MASK;
335
336 if (likely(irqnr > 15 && irqnr < 1020)) {
337 if (static_key_true(&supports_deactivate))
338 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
339 handle_domain_irq(gic->domain, irqnr, regs);
340 continue;
341 }
342 if (irqnr < 16) {
343 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
344 if (static_key_true(&supports_deactivate))
345 writel_relaxed(irqstat, cpu_base + GIC_CPU_DEACTIVATE);
346#ifdef CONFIG_SMP
347 handle_IPI(irqnr, regs);
348#endif
349 continue;
350 }
351 break;
352 } while (1);
353}
354
355static void gic_handle_cascade_irq(struct irq_desc *desc)
356{
357 struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc);
358 struct irq_chip *chip = irq_desc_get_chip(desc);
359 unsigned int cascade_irq, gic_irq;
360 unsigned long status;
361
362 chained_irq_enter(chip, desc);
363
364 raw_spin_lock(&irq_controller_lock);
365 status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
366 raw_spin_unlock(&irq_controller_lock);
367
368 gic_irq = (status & GICC_IAR_INT_ID_MASK);
369 if (gic_irq == GICC_INT_SPURIOUS)
370 goto out;
371
372 cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
373 if (unlikely(gic_irq < 32 || gic_irq > 1020))
374 handle_bad_irq(desc);
375 else
376 generic_handle_irq(cascade_irq);
377
378 out:
379 chained_irq_exit(chip, desc);
380}
381
382static struct irq_chip gic_chip = {
383 .irq_mask = gic_mask_irq,
384 .irq_unmask = gic_unmask_irq,
385 .irq_eoi = gic_eoi_irq,
386 .irq_set_type = gic_set_type,
387 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
388 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
389 .flags = IRQCHIP_SET_TYPE_MASKED |
390 IRQCHIP_SKIP_SET_WAKE |
391 IRQCHIP_MASK_ON_SUSPEND,
392};
393
394static struct irq_chip gic_eoimode1_chip = {
395 .name = "GICv2",
396 .irq_mask = gic_eoimode1_mask_irq,
397 .irq_unmask = gic_unmask_irq,
398 .irq_eoi = gic_eoimode1_eoi_irq,
399 .irq_set_type = gic_set_type,
400 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
401 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
402 .irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity,
403 .flags = IRQCHIP_SET_TYPE_MASKED |
404 IRQCHIP_SKIP_SET_WAKE |
405 IRQCHIP_MASK_ON_SUSPEND,
406};
407
408void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
409{
410 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
411 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq,
412 &gic_data[gic_nr]);
413}
414
415static u8 gic_get_cpumask(struct gic_chip_data *gic)
416{
417 void __iomem *base = gic_data_dist_base(gic);
418 u32 mask, i;
419
420 for (i = mask = 0; i < 32; i += 4) {
421 mask = readl_relaxed(base + GIC_DIST_TARGET + i);
422 mask |= mask >> 16;
423 mask |= mask >> 8;
424 if (mask)
425 break;
426 }
427
428 if (!mask && num_possible_cpus() > 1)
429 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
430
431 return mask;
432}
433
434static void gic_cpu_if_up(struct gic_chip_data *gic)
435{
436 void __iomem *cpu_base = gic_data_cpu_base(gic);
437 u32 bypass = 0;
438 u32 mode = 0;
439
440 if (gic == &gic_data[0] && static_key_true(&supports_deactivate))
441 mode = GIC_CPU_CTRL_EOImodeNS;
442
443 /*
444 * Preserve bypass disable bits to be written back later
445 */
446 bypass = readl(cpu_base + GIC_CPU_CTRL);
447 bypass &= GICC_DIS_BYPASS_MASK;
448
449 writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL);
450}
451
452
453static void __init gic_dist_init(struct gic_chip_data *gic)
454{
455 unsigned int i;
456 u32 cpumask;
457 unsigned int gic_irqs = gic->gic_irqs;
458 void __iomem *base = gic_data_dist_base(gic);
459
460 writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL);
461
462 /*
463 * Set all global interrupts to this CPU only.
464 */
465 cpumask = gic_get_cpumask(gic);
466 cpumask |= cpumask << 8;
467 cpumask |= cpumask << 16;
468 for (i = 32; i < gic_irqs; i += 4)
469 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
470
471 gic_dist_config(base, gic_irqs, NULL);
472
473 writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
474}
475
476static void gic_cpu_init(struct gic_chip_data *gic)
477{
478 void __iomem *dist_base = gic_data_dist_base(gic);
479 void __iomem *base = gic_data_cpu_base(gic);
480 unsigned int cpu_mask, cpu = smp_processor_id();
481 int i;
482
483 /*
484 * Setting up the CPU map is only relevant for the primary GIC
485 * because any nested/secondary GICs do not directly interface
486 * with the CPU(s).
487 */
488 if (gic == &gic_data[0]) {
489 /*
490 * Get what the GIC says our CPU mask is.
491 */
492 BUG_ON(cpu >= NR_GIC_CPU_IF);
493 cpu_mask = gic_get_cpumask(gic);
494 gic_cpu_map[cpu] = cpu_mask;
495
496 /*
497 * Clear our mask from the other map entries in case they're
498 * still undefined.
499 */
500 for (i = 0; i < NR_GIC_CPU_IF; i++)
501 if (i != cpu)
502 gic_cpu_map[i] &= ~cpu_mask;
503 }
504
505 gic_cpu_config(dist_base, NULL);
506
507 writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
508 gic_cpu_if_up(gic);
509}
510
511int gic_cpu_if_down(unsigned int gic_nr)
512{
513 void __iomem *cpu_base;
514 u32 val = 0;
515
516 if (gic_nr >= CONFIG_ARM_GIC_MAX_NR)
517 return -EINVAL;
518
519 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
520 val = readl(cpu_base + GIC_CPU_CTRL);
521 val &= ~GICC_ENABLE;
522 writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
523
524 return 0;
525}
526
527#ifdef CONFIG_CPU_PM
528/*
529 * Saves the GIC distributor registers during suspend or idle. Must be called
530 * with interrupts disabled but before powering down the GIC. After calling
531 * this function, no interrupts will be delivered by the GIC, and another
532 * platform-specific wakeup source must be enabled.
533 */
534static void gic_dist_save(unsigned int gic_nr)
535{
536 unsigned int gic_irqs;
537 void __iomem *dist_base;
538 int i;
539
540 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
541
542 gic_irqs = gic_data[gic_nr].gic_irqs;
543 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
544
545 if (!dist_base)
546 return;
547
548 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
549 gic_data[gic_nr].saved_spi_conf[i] =
550 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
551
552 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
553 gic_data[gic_nr].saved_spi_target[i] =
554 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
555
556 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
557 gic_data[gic_nr].saved_spi_enable[i] =
558 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
559
560 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
561 gic_data[gic_nr].saved_spi_active[i] =
562 readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
563}
564
565/*
566 * Restores the GIC distributor registers during resume or when coming out of
567 * idle. Must be called before enabling interrupts. If a level interrupt
568 * that occured while the GIC was suspended is still present, it will be
569 * handled normally, but any edge interrupts that occured will not be seen by
570 * the GIC and need to be handled by the platform-specific wakeup source.
571 */
572static void gic_dist_restore(unsigned int gic_nr)
573{
574 unsigned int gic_irqs;
575 unsigned int i;
576 void __iomem *dist_base;
577
578 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
579
580 gic_irqs = gic_data[gic_nr].gic_irqs;
581 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
582
583 if (!dist_base)
584 return;
585
586 writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
587
588 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
589 writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
590 dist_base + GIC_DIST_CONFIG + i * 4);
591
592 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
593 writel_relaxed(GICD_INT_DEF_PRI_X4,
594 dist_base + GIC_DIST_PRI + i * 4);
595
596 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
597 writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
598 dist_base + GIC_DIST_TARGET + i * 4);
599
600 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
601 writel_relaxed(GICD_INT_EN_CLR_X32,
602 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
603 writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
604 dist_base + GIC_DIST_ENABLE_SET + i * 4);
605 }
606
607 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
608 writel_relaxed(GICD_INT_EN_CLR_X32,
609 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
610 writel_relaxed(gic_data[gic_nr].saved_spi_active[i],
611 dist_base + GIC_DIST_ACTIVE_SET + i * 4);
612 }
613
614 writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
615}
616
617static void gic_cpu_save(unsigned int gic_nr)
618{
619 int i;
620 u32 *ptr;
621 void __iomem *dist_base;
622 void __iomem *cpu_base;
623
624 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
625
626 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
627 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
628
629 if (!dist_base || !cpu_base)
630 return;
631
632 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
633 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
634 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
635
636 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
637 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
638 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
639
640 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
641 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
642 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
643
644}
645
646static void gic_cpu_restore(unsigned int gic_nr)
647{
648 int i;
649 u32 *ptr;
650 void __iomem *dist_base;
651 void __iomem *cpu_base;
652
653 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
654
655 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
656 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
657
658 if (!dist_base || !cpu_base)
659 return;
660
661 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
662 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
663 writel_relaxed(GICD_INT_EN_CLR_X32,
664 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
665 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
666 }
667
668 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
669 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
670 writel_relaxed(GICD_INT_EN_CLR_X32,
671 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
672 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
673 }
674
675 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
676 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
677 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
678
679 for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
680 writel_relaxed(GICD_INT_DEF_PRI_X4,
681 dist_base + GIC_DIST_PRI + i * 4);
682
683 writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
684 gic_cpu_if_up(&gic_data[gic_nr]);
685}
686
687static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
688{
689 int i;
690
691 for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
692#ifdef CONFIG_GIC_NON_BANKED
693 /* Skip over unused GICs */
694 if (!gic_data[i].get_base)
695 continue;
696#endif
697 switch (cmd) {
698 case CPU_PM_ENTER:
699 gic_cpu_save(i);
700 break;
701 case CPU_PM_ENTER_FAILED:
702 case CPU_PM_EXIT:
703 gic_cpu_restore(i);
704 break;
705 case CPU_CLUSTER_PM_ENTER:
706 gic_dist_save(i);
707 break;
708 case CPU_CLUSTER_PM_ENTER_FAILED:
709 case CPU_CLUSTER_PM_EXIT:
710 gic_dist_restore(i);
711 break;
712 }
713 }
714
715 return NOTIFY_OK;
716}
717
718static struct notifier_block gic_notifier_block = {
719 .notifier_call = gic_notifier,
720};
721
722static void __init gic_pm_init(struct gic_chip_data *gic)
723{
724 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
725 sizeof(u32));
726 BUG_ON(!gic->saved_ppi_enable);
727
728 gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
729 sizeof(u32));
730 BUG_ON(!gic->saved_ppi_active);
731
732 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
733 sizeof(u32));
734 BUG_ON(!gic->saved_ppi_conf);
735
736 if (gic == &gic_data[0])
737 cpu_pm_register_notifier(&gic_notifier_block);
738}
739#else
740static void __init gic_pm_init(struct gic_chip_data *gic)
741{
742}
743#endif
744
745#ifdef CONFIG_SMP
746static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
747{
748 int cpu;
749 unsigned long flags, map = 0;
750
751 raw_spin_lock_irqsave(&irq_controller_lock, flags);
752
753 /* Convert our logical CPU mask into a physical one. */
754 for_each_cpu(cpu, mask)
755 map |= gic_cpu_map[cpu];
756
757 /*
758 * Ensure that stores to Normal memory are visible to the
759 * other CPUs before they observe us issuing the IPI.
760 */
761 dmb(ishst);
762
763 /* this always happens on GIC0 */
764 writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
765
766 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
767}
768#endif
769
770#ifdef CONFIG_BL_SWITCHER
771/*
772 * gic_send_sgi - send a SGI directly to given CPU interface number
773 *
774 * cpu_id: the ID for the destination CPU interface
775 * irq: the IPI number to send a SGI for
776 */
777void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
778{
779 BUG_ON(cpu_id >= NR_GIC_CPU_IF);
780 cpu_id = 1 << cpu_id;
781 /* this always happens on GIC0 */
782 writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
783}
784
785/*
786 * gic_get_cpu_id - get the CPU interface ID for the specified CPU
787 *
788 * @cpu: the logical CPU number to get the GIC ID for.
789 *
790 * Return the CPU interface ID for the given logical CPU number,
791 * or -1 if the CPU number is too large or the interface ID is
792 * unknown (more than one bit set).
793 */
794int gic_get_cpu_id(unsigned int cpu)
795{
796 unsigned int cpu_bit;
797
798 if (cpu >= NR_GIC_CPU_IF)
799 return -1;
800 cpu_bit = gic_cpu_map[cpu];
801 if (cpu_bit & (cpu_bit - 1))
802 return -1;
803 return __ffs(cpu_bit);
804}
805
806/*
807 * gic_migrate_target - migrate IRQs to another CPU interface
808 *
809 * @new_cpu_id: the CPU target ID to migrate IRQs to
810 *
811 * Migrate all peripheral interrupts with a target matching the current CPU
812 * to the interface corresponding to @new_cpu_id. The CPU interface mapping
813 * is also updated. Targets to other CPU interfaces are unchanged.
814 * This must be called with IRQs locally disabled.
815 */
816void gic_migrate_target(unsigned int new_cpu_id)
817{
818 unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
819 void __iomem *dist_base;
820 int i, ror_val, cpu = smp_processor_id();
821 u32 val, cur_target_mask, active_mask;
822
823 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
824
825 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
826 if (!dist_base)
827 return;
828 gic_irqs = gic_data[gic_nr].gic_irqs;
829
830 cur_cpu_id = __ffs(gic_cpu_map[cpu]);
831 cur_target_mask = 0x01010101 << cur_cpu_id;
832 ror_val = (cur_cpu_id - new_cpu_id) & 31;
833
834 raw_spin_lock(&irq_controller_lock);
835
836 /* Update the target interface for this logical CPU */
837 gic_cpu_map[cpu] = 1 << new_cpu_id;
838
839 /*
840 * Find all the peripheral interrupts targetting the current
841 * CPU interface and migrate them to the new CPU interface.
842 * We skip DIST_TARGET 0 to 7 as they are read-only.
843 */
844 for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
845 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
846 active_mask = val & cur_target_mask;
847 if (active_mask) {
848 val &= ~active_mask;
849 val |= ror32(active_mask, ror_val);
850 writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
851 }
852 }
853
854 raw_spin_unlock(&irq_controller_lock);
855
856 /*
857 * Now let's migrate and clear any potential SGIs that might be
858 * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET
859 * is a banked register, we can only forward the SGI using
860 * GIC_DIST_SOFTINT. The original SGI source is lost but Linux
861 * doesn't use that information anyway.
862 *
863 * For the same reason we do not adjust SGI source information
864 * for previously sent SGIs by us to other CPUs either.
865 */
866 for (i = 0; i < 16; i += 4) {
867 int j;
868 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
869 if (!val)
870 continue;
871 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
872 for (j = i; j < i + 4; j++) {
873 if (val & 0xff)
874 writel_relaxed((1 << (new_cpu_id + 16)) | j,
875 dist_base + GIC_DIST_SOFTINT);
876 val >>= 8;
877 }
878 }
879}
880
881/*
882 * gic_get_sgir_physaddr - get the physical address for the SGI register
883 *
884 * REturn the physical address of the SGI register to be used
885 * by some early assembly code when the kernel is not yet available.
886 */
887static unsigned long gic_dist_physaddr;
888
889unsigned long gic_get_sgir_physaddr(void)
890{
891 if (!gic_dist_physaddr)
892 return 0;
893 return gic_dist_physaddr + GIC_DIST_SOFTINT;
894}
895
896void __init gic_init_physaddr(struct device_node *node)
897{
898 struct resource res;
899 if (of_address_to_resource(node, 0, &res) == 0) {
900 gic_dist_physaddr = res.start;
901 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
902 }
903}
904
905#else
906#define gic_init_physaddr(node) do { } while (0)
907#endif
908
909static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
910 irq_hw_number_t hw)
911{
912 struct gic_chip_data *gic = d->host_data;
913
914 if (hw < 32) {
915 irq_set_percpu_devid(irq);
916 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
917 handle_percpu_devid_irq, NULL, NULL);
918 irq_set_status_flags(irq, IRQ_NOAUTOEN);
919 } else {
920 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
921 handle_fasteoi_irq, NULL, NULL);
922 irq_set_probe(irq);
923 }
924 return 0;
925}
926
927static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
928{
929}
930
931static int gic_irq_domain_translate(struct irq_domain *d,
932 struct irq_fwspec *fwspec,
933 unsigned long *hwirq,
934 unsigned int *type)
935{
936 if (is_of_node(fwspec->fwnode)) {
937 if (fwspec->param_count < 3)
938 return -EINVAL;
939
940 /* Get the interrupt number and add 16 to skip over SGIs */
941 *hwirq = fwspec->param[1] + 16;
942
943 /*
944 * For SPIs, we need to add 16 more to get the GIC irq
945 * ID number
946 */
947 if (!fwspec->param[0])
948 *hwirq += 16;
949
950 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
951 return 0;
952 }
953
954 if (is_fwnode_irqchip(fwspec->fwnode)) {
955 if(fwspec->param_count != 2)
956 return -EINVAL;
957
958 *hwirq = fwspec->param[0];
959 *type = fwspec->param[1];
960 return 0;
961 }
962
963 return -EINVAL;
964}
965
966#ifdef CONFIG_SMP
967static int gic_secondary_init(struct notifier_block *nfb, unsigned long action,
968 void *hcpu)
969{
970 if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
971 gic_cpu_init(&gic_data[0]);
972 return NOTIFY_OK;
973}
974
975/*
976 * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
977 * priority because the GIC needs to be up before the ARM generic timers.
978 */
979static struct notifier_block gic_cpu_notifier = {
980 .notifier_call = gic_secondary_init,
981 .priority = 100,
982};
983#endif
984
985static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
986 unsigned int nr_irqs, void *arg)
987{
988 int i, ret;
989 irq_hw_number_t hwirq;
990 unsigned int type = IRQ_TYPE_NONE;
991 struct irq_fwspec *fwspec = arg;
992
993 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
994 if (ret)
995 return ret;
996
997 for (i = 0; i < nr_irqs; i++)
998 gic_irq_domain_map(domain, virq + i, hwirq + i);
999
1000 return 0;
1001}
1002
1003static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
1004 .translate = gic_irq_domain_translate,
1005 .alloc = gic_irq_domain_alloc,
1006 .free = irq_domain_free_irqs_top,
1007};
1008
1009static const struct irq_domain_ops gic_irq_domain_ops = {
1010 .map = gic_irq_domain_map,
1011 .unmap = gic_irq_domain_unmap,
1012};
1013
1014static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
1015 void __iomem *dist_base, void __iomem *cpu_base,
1016 u32 percpu_offset, struct fwnode_handle *handle)
1017{
1018 irq_hw_number_t hwirq_base;
1019 struct gic_chip_data *gic;
1020 int gic_irqs, irq_base, i;
1021
1022 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
1023
1024 gic_check_cpu_features();
1025
1026 gic = &gic_data[gic_nr];
1027
1028 /* Initialize irq_chip */
1029 if (static_key_true(&supports_deactivate) && gic_nr == 0) {
1030 gic->chip = gic_eoimode1_chip;
1031 } else {
1032 gic->chip = gic_chip;
1033 gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d", gic_nr);
1034 }
1035
1036#ifdef CONFIG_SMP
1037 if (gic_nr == 0)
1038 gic->chip.irq_set_affinity = gic_set_affinity;
1039#endif
1040
1041#ifdef CONFIG_GIC_NON_BANKED
1042 if (percpu_offset) { /* Frankein-GIC without banked registers... */
1043 unsigned int cpu;
1044
1045 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
1046 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
1047 if (WARN_ON(!gic->dist_base.percpu_base ||
1048 !gic->cpu_base.percpu_base)) {
1049 free_percpu(gic->dist_base.percpu_base);
1050 free_percpu(gic->cpu_base.percpu_base);
1051 return;
1052 }
1053
1054 for_each_possible_cpu(cpu) {
1055 u32 mpidr = cpu_logical_map(cpu);
1056 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
1057 unsigned long offset = percpu_offset * core_id;
1058 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
1059 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
1060 }
1061
1062 gic_set_base_accessor(gic, gic_get_percpu_base);
1063 } else
1064#endif
1065 { /* Normal, sane GIC... */
1066 WARN(percpu_offset,
1067 "GIC_NON_BANKED not enabled, ignoring %08x offset!",
1068 percpu_offset);
1069 gic->dist_base.common_base = dist_base;
1070 gic->cpu_base.common_base = cpu_base;
1071 gic_set_base_accessor(gic, gic_get_common_base);
1072 }
1073
1074 /*
1075 * Find out how many interrupts are supported.
1076 * The GIC only supports up to 1020 interrupt sources.
1077 */
1078 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
1079 gic_irqs = (gic_irqs + 1) * 32;
1080 if (gic_irqs > 1020)
1081 gic_irqs = 1020;
1082 gic->gic_irqs = gic_irqs;
1083
1084 if (handle) { /* DT/ACPI */
1085 gic->domain = irq_domain_create_linear(handle, gic_irqs,
1086 &gic_irq_domain_hierarchy_ops,
1087 gic);
1088 } else { /* Legacy support */
1089 /*
1090 * For primary GICs, skip over SGIs.
1091 * For secondary GICs, skip over PPIs, too.
1092 */
1093 if (gic_nr == 0 && (irq_start & 31) > 0) {
1094 hwirq_base = 16;
1095 if (irq_start != -1)
1096 irq_start = (irq_start & ~31) + 16;
1097 } else {
1098 hwirq_base = 32;
1099 }
1100
1101 gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
1102
1103 irq_base = irq_alloc_descs(irq_start, 16, gic_irqs,
1104 numa_node_id());
1105 if (IS_ERR_VALUE(irq_base)) {
1106 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
1107 irq_start);
1108 irq_base = irq_start;
1109 }
1110
1111 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
1112 hwirq_base, &gic_irq_domain_ops, gic);
1113 }
1114
1115 if (WARN_ON(!gic->domain))
1116 return;
1117
1118 if (gic_nr == 0) {
1119 /*
1120 * Initialize the CPU interface map to all CPUs.
1121 * It will be refined as each CPU probes its ID.
1122 * This is only necessary for the primary GIC.
1123 */
1124 for (i = 0; i < NR_GIC_CPU_IF; i++)
1125 gic_cpu_map[i] = 0xff;
1126#ifdef CONFIG_SMP
1127 set_smp_cross_call(gic_raise_softirq);
1128 register_cpu_notifier(&gic_cpu_notifier);
1129#endif
1130 set_handle_irq(gic_handle_irq);
1131 if (static_key_true(&supports_deactivate))
1132 pr_info("GIC: Using split EOI/Deactivate mode\n");
1133 }
1134
1135 gic_dist_init(gic);
1136 gic_cpu_init(gic);
1137 gic_pm_init(gic);
1138}
1139
1140void __init gic_init(unsigned int gic_nr, int irq_start,
1141 void __iomem *dist_base, void __iomem *cpu_base)
1142{
1143 /*
1144 * Non-DT/ACPI systems won't run a hypervisor, so let's not
1145 * bother with these...
1146 */
1147 static_key_slow_dec(&supports_deactivate);
1148 __gic_init_bases(gic_nr, irq_start, dist_base, cpu_base, 0, NULL);
1149}
1150
1151#ifdef CONFIG_OF
1152static int gic_cnt __initdata;
1153
1154static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
1155{
1156 struct resource cpuif_res;
1157
1158 of_address_to_resource(node, 1, &cpuif_res);
1159
1160 if (!is_hyp_mode_available())
1161 return false;
1162 if (resource_size(&cpuif_res) < SZ_8K)
1163 return false;
1164 if (resource_size(&cpuif_res) == SZ_128K) {
1165 u32 val_low, val_high;
1166
1167 /*
1168 * Verify that we have the first 4kB of a GIC400
1169 * aliased over the first 64kB by checking the
1170 * GICC_IIDR register on both ends.
1171 */
1172 val_low = readl_relaxed(*base + GIC_CPU_IDENT);
1173 val_high = readl_relaxed(*base + GIC_CPU_IDENT + 0xf000);
1174 if ((val_low & 0xffff0fff) != 0x0202043B ||
1175 val_low != val_high)
1176 return false;
1177
1178 /*
1179 * Move the base up by 60kB, so that we have a 8kB
1180 * contiguous region, which allows us to use GICC_DIR
1181 * at its normal offset. Please pass me that bucket.
1182 */
1183 *base += 0xf000;
1184 cpuif_res.start += 0xf000;
1185 pr_warn("GIC: Adjusting CPU interface base to %pa",
1186 &cpuif_res.start);
1187 }
1188
1189 return true;
1190}
1191
1192int __init
1193gic_of_init(struct device_node *node, struct device_node *parent)
1194{
1195 void __iomem *cpu_base;
1196 void __iomem *dist_base;
1197 u32 percpu_offset;
1198 int irq;
1199
1200 if (WARN_ON(!node))
1201 return -ENODEV;
1202
1203 dist_base = of_iomap(node, 0);
1204 WARN(!dist_base, "unable to map gic dist registers\n");
1205
1206 cpu_base = of_iomap(node, 1);
1207 WARN(!cpu_base, "unable to map gic cpu registers\n");
1208
1209 /*
1210 * Disable split EOI/Deactivate if either HYP is not available
1211 * or the CPU interface is too small.
1212 */
1213 if (gic_cnt == 0 && !gic_check_eoimode(node, &cpu_base))
1214 static_key_slow_dec(&supports_deactivate);
1215
1216 if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
1217 percpu_offset = 0;
1218
1219 __gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset,
1220 &node->fwnode);
1221 if (!gic_cnt)
1222 gic_init_physaddr(node);
1223
1224 if (parent) {
1225 irq = irq_of_parse_and_map(node, 0);
1226 gic_cascade_irq(gic_cnt, irq);
1227 }
1228
1229 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1230 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
1231
1232 gic_cnt++;
1233 return 0;
1234}
1235IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
1236IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
1237IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
1238IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
1239IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
1240IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
1241IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
1242IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
1243IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
1244
1245#endif
1246
1247#ifdef CONFIG_ACPI
1248static phys_addr_t cpu_phy_base __initdata;
1249
1250static int __init
1251gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
1252 const unsigned long end)
1253{
1254 struct acpi_madt_generic_interrupt *processor;
1255 phys_addr_t gic_cpu_base;
1256 static int cpu_base_assigned;
1257
1258 processor = (struct acpi_madt_generic_interrupt *)header;
1259
1260 if (BAD_MADT_GICC_ENTRY(processor, end))
1261 return -EINVAL;
1262
1263 /*
1264 * There is no support for non-banked GICv1/2 register in ACPI spec.
1265 * All CPU interface addresses have to be the same.
1266 */
1267 gic_cpu_base = processor->base_address;
1268 if (cpu_base_assigned && gic_cpu_base != cpu_phy_base)
1269 return -EINVAL;
1270
1271 cpu_phy_base = gic_cpu_base;
1272 cpu_base_assigned = 1;
1273 return 0;
1274}
1275
1276/* The things you have to do to just *count* something... */
1277static int __init acpi_dummy_func(struct acpi_subtable_header *header,
1278 const unsigned long end)
1279{
1280 return 0;
1281}
1282
1283static bool __init acpi_gic_redist_is_present(void)
1284{
1285 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1286 acpi_dummy_func, 0) > 0;
1287}
1288
1289static bool __init gic_validate_dist(struct acpi_subtable_header *header,
1290 struct acpi_probe_entry *ape)
1291{
1292 struct acpi_madt_generic_distributor *dist;
1293 dist = (struct acpi_madt_generic_distributor *)header;
1294
1295 return (dist->version == ape->driver_data &&
1296 (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
1297 !acpi_gic_redist_is_present()));
1298}
1299
1300#define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
1301#define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
1302
1303static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
1304 const unsigned long end)
1305{
1306 struct acpi_madt_generic_distributor *dist;
1307 void __iomem *cpu_base, *dist_base;
1308 struct fwnode_handle *domain_handle;
1309 int count;
1310
1311 /* Collect CPU base addresses */
1312 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1313 gic_acpi_parse_madt_cpu, 0);
1314 if (count <= 0) {
1315 pr_err("No valid GICC entries exist\n");
1316 return -EINVAL;
1317 }
1318
1319 cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
1320 if (!cpu_base) {
1321 pr_err("Unable to map GICC registers\n");
1322 return -ENOMEM;
1323 }
1324
1325 dist = (struct acpi_madt_generic_distributor *)header;
1326 dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE);
1327 if (!dist_base) {
1328 pr_err("Unable to map GICD registers\n");
1329 iounmap(cpu_base);
1330 return -ENOMEM;
1331 }
1332
1333 /*
1334 * Disable split EOI/Deactivate if HYP is not available. ACPI
1335 * guarantees that we'll always have a GICv2, so the CPU
1336 * interface will always be the right size.
1337 */
1338 if (!is_hyp_mode_available())
1339 static_key_slow_dec(&supports_deactivate);
1340
1341 /*
1342 * Initialize GIC instance zero (no multi-GIC support).
1343 */
1344 domain_handle = irq_domain_alloc_fwnode(dist_base);
1345 if (!domain_handle) {
1346 pr_err("Unable to allocate domain handle\n");
1347 iounmap(cpu_base);
1348 iounmap(dist_base);
1349 return -ENOMEM;
1350 }
1351
1352 __gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
1353
1354 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1355
1356 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1357 gicv2m_init(NULL, gic_data[0].domain);
1358
1359 return 0;
1360}
1361IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1362 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
1363 gic_v2_acpi_init);
1364IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1365 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,
1366 gic_v2_acpi_init);
1367#endif
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
4 *
5 * Interrupt architecture for the GIC:
6 *
7 * o There is one Interrupt Distributor, which receives interrupts
8 * from system devices and sends them to the Interrupt Controllers.
9 *
10 * o There is one CPU Interface per CPU, which sends interrupts sent
11 * by the Distributor, and interrupts generated locally, to the
12 * associated CPU. The base address of the CPU interface is usually
13 * aliased so that the same address points to different chips depending
14 * on the CPU it is accessed from.
15 *
16 * Note that IRQs 0-31 are special - they are local to each CPU.
17 * As such, the enable set/clear, pending set/clear and active bit
18 * registers are banked per-cpu for these sources.
19 */
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/err.h>
23#include <linux/module.h>
24#include <linux/list.h>
25#include <linux/smp.h>
26#include <linux/cpu.h>
27#include <linux/cpu_pm.h>
28#include <linux/cpumask.h>
29#include <linux/io.h>
30#include <linux/of.h>
31#include <linux/of_address.h>
32#include <linux/of_irq.h>
33#include <linux/acpi.h>
34#include <linux/irqdomain.h>
35#include <linux/interrupt.h>
36#include <linux/percpu.h>
37#include <linux/slab.h>
38#include <linux/irqchip.h>
39#include <linux/irqchip/chained_irq.h>
40#include <linux/irqchip/arm-gic.h>
41
42#include <asm/cputype.h>
43#include <asm/irq.h>
44#include <asm/exception.h>
45#include <asm/smp_plat.h>
46#include <asm/virt.h>
47
48#include "irq-gic-common.h"
49
50#ifdef CONFIG_ARM64
51#include <asm/cpufeature.h>
52
53static void gic_check_cpu_features(void)
54{
55 WARN_TAINT_ONCE(this_cpu_has_cap(ARM64_HAS_SYSREG_GIC_CPUIF),
56 TAINT_CPU_OUT_OF_SPEC,
57 "GICv3 system registers enabled, broken firmware!\n");
58}
59#else
60#define gic_check_cpu_features() do { } while(0)
61#endif
62
63union gic_base {
64 void __iomem *common_base;
65 void __percpu * __iomem *percpu_base;
66};
67
68struct gic_chip_data {
69 struct irq_chip chip;
70 union gic_base dist_base;
71 union gic_base cpu_base;
72 void __iomem *raw_dist_base;
73 void __iomem *raw_cpu_base;
74 u32 percpu_offset;
75#if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM)
76 u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
77 u32 saved_spi_active[DIV_ROUND_UP(1020, 32)];
78 u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
79 u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
80 u32 __percpu *saved_ppi_enable;
81 u32 __percpu *saved_ppi_active;
82 u32 __percpu *saved_ppi_conf;
83#endif
84 struct irq_domain *domain;
85 unsigned int gic_irqs;
86#ifdef CONFIG_GIC_NON_BANKED
87 void __iomem *(*get_base)(union gic_base *);
88#endif
89};
90
91#ifdef CONFIG_BL_SWITCHER
92
93static DEFINE_RAW_SPINLOCK(cpu_map_lock);
94
95#define gic_lock_irqsave(f) \
96 raw_spin_lock_irqsave(&cpu_map_lock, (f))
97#define gic_unlock_irqrestore(f) \
98 raw_spin_unlock_irqrestore(&cpu_map_lock, (f))
99
100#define gic_lock() raw_spin_lock(&cpu_map_lock)
101#define gic_unlock() raw_spin_unlock(&cpu_map_lock)
102
103#else
104
105#define gic_lock_irqsave(f) do { (void)(f); } while(0)
106#define gic_unlock_irqrestore(f) do { (void)(f); } while(0)
107
108#define gic_lock() do { } while(0)
109#define gic_unlock() do { } while(0)
110
111#endif
112
113/*
114 * The GIC mapping of CPU interfaces does not necessarily match
115 * the logical CPU numbering. Let's use a mapping as returned
116 * by the GIC itself.
117 */
118#define NR_GIC_CPU_IF 8
119static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
120
121static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
122
123static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly;
124
125static struct gic_kvm_info gic_v2_kvm_info;
126
127#ifdef CONFIG_GIC_NON_BANKED
128static void __iomem *gic_get_percpu_base(union gic_base *base)
129{
130 return raw_cpu_read(*base->percpu_base);
131}
132
133static void __iomem *gic_get_common_base(union gic_base *base)
134{
135 return base->common_base;
136}
137
138static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
139{
140 return data->get_base(&data->dist_base);
141}
142
143static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
144{
145 return data->get_base(&data->cpu_base);
146}
147
148static inline void gic_set_base_accessor(struct gic_chip_data *data,
149 void __iomem *(*f)(union gic_base *))
150{
151 data->get_base = f;
152}
153#else
154#define gic_data_dist_base(d) ((d)->dist_base.common_base)
155#define gic_data_cpu_base(d) ((d)->cpu_base.common_base)
156#define gic_set_base_accessor(d, f)
157#endif
158
159static inline void __iomem *gic_dist_base(struct irq_data *d)
160{
161 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
162 return gic_data_dist_base(gic_data);
163}
164
165static inline void __iomem *gic_cpu_base(struct irq_data *d)
166{
167 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
168 return gic_data_cpu_base(gic_data);
169}
170
171static inline unsigned int gic_irq(struct irq_data *d)
172{
173 return d->hwirq;
174}
175
176static inline bool cascading_gic_irq(struct irq_data *d)
177{
178 void *data = irq_data_get_irq_handler_data(d);
179
180 /*
181 * If handler_data is set, this is a cascading interrupt, and
182 * it cannot possibly be forwarded.
183 */
184 return data != NULL;
185}
186
187/*
188 * Routines to acknowledge, disable and enable interrupts
189 */
190static void gic_poke_irq(struct irq_data *d, u32 offset)
191{
192 u32 mask = 1 << (gic_irq(d) % 32);
193 writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4);
194}
195
196static int gic_peek_irq(struct irq_data *d, u32 offset)
197{
198 u32 mask = 1 << (gic_irq(d) % 32);
199 return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask);
200}
201
202static void gic_mask_irq(struct irq_data *d)
203{
204 gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR);
205}
206
207static void gic_eoimode1_mask_irq(struct irq_data *d)
208{
209 gic_mask_irq(d);
210 /*
211 * When masking a forwarded interrupt, make sure it is
212 * deactivated as well.
213 *
214 * This ensures that an interrupt that is getting
215 * disabled/masked will not get "stuck", because there is
216 * noone to deactivate it (guest is being terminated).
217 */
218 if (irqd_is_forwarded_to_vcpu(d))
219 gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR);
220}
221
222static void gic_unmask_irq(struct irq_data *d)
223{
224 gic_poke_irq(d, GIC_DIST_ENABLE_SET);
225}
226
227static void gic_eoi_irq(struct irq_data *d)
228{
229 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
230}
231
232static void gic_eoimode1_eoi_irq(struct irq_data *d)
233{
234 /* Do not deactivate an IRQ forwarded to a vcpu. */
235 if (irqd_is_forwarded_to_vcpu(d))
236 return;
237
238 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
239}
240
241static int gic_irq_set_irqchip_state(struct irq_data *d,
242 enum irqchip_irq_state which, bool val)
243{
244 u32 reg;
245
246 switch (which) {
247 case IRQCHIP_STATE_PENDING:
248 reg = val ? GIC_DIST_PENDING_SET : GIC_DIST_PENDING_CLEAR;
249 break;
250
251 case IRQCHIP_STATE_ACTIVE:
252 reg = val ? GIC_DIST_ACTIVE_SET : GIC_DIST_ACTIVE_CLEAR;
253 break;
254
255 case IRQCHIP_STATE_MASKED:
256 reg = val ? GIC_DIST_ENABLE_CLEAR : GIC_DIST_ENABLE_SET;
257 break;
258
259 default:
260 return -EINVAL;
261 }
262
263 gic_poke_irq(d, reg);
264 return 0;
265}
266
267static int gic_irq_get_irqchip_state(struct irq_data *d,
268 enum irqchip_irq_state which, bool *val)
269{
270 switch (which) {
271 case IRQCHIP_STATE_PENDING:
272 *val = gic_peek_irq(d, GIC_DIST_PENDING_SET);
273 break;
274
275 case IRQCHIP_STATE_ACTIVE:
276 *val = gic_peek_irq(d, GIC_DIST_ACTIVE_SET);
277 break;
278
279 case IRQCHIP_STATE_MASKED:
280 *val = !gic_peek_irq(d, GIC_DIST_ENABLE_SET);
281 break;
282
283 default:
284 return -EINVAL;
285 }
286
287 return 0;
288}
289
290static int gic_set_type(struct irq_data *d, unsigned int type)
291{
292 void __iomem *base = gic_dist_base(d);
293 unsigned int gicirq = gic_irq(d);
294 int ret;
295
296 /* Interrupt configuration for SGIs can't be changed */
297 if (gicirq < 16)
298 return -EINVAL;
299
300 /* SPIs have restrictions on the supported types */
301 if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
302 type != IRQ_TYPE_EDGE_RISING)
303 return -EINVAL;
304
305 ret = gic_configure_irq(gicirq, type, base + GIC_DIST_CONFIG, NULL);
306 if (ret && gicirq < 32) {
307 /* Misconfigured PPIs are usually not fatal */
308 pr_warn("GIC: PPI%d is secure or misconfigured\n", gicirq - 16);
309 ret = 0;
310 }
311
312 return ret;
313}
314
315static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
316{
317 /* Only interrupts on the primary GIC can be forwarded to a vcpu. */
318 if (cascading_gic_irq(d))
319 return -EINVAL;
320
321 if (vcpu)
322 irqd_set_forwarded_to_vcpu(d);
323 else
324 irqd_clr_forwarded_to_vcpu(d);
325 return 0;
326}
327
328#ifdef CONFIG_SMP
329static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
330 bool force)
331{
332 void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + gic_irq(d);
333 unsigned int cpu;
334
335 if (!force)
336 cpu = cpumask_any_and(mask_val, cpu_online_mask);
337 else
338 cpu = cpumask_first(mask_val);
339
340 if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
341 return -EINVAL;
342
343 writeb_relaxed(gic_cpu_map[cpu], reg);
344 irq_data_update_effective_affinity(d, cpumask_of(cpu));
345
346 return IRQ_SET_MASK_OK_DONE;
347}
348#endif
349
350static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
351{
352 u32 irqstat, irqnr;
353 struct gic_chip_data *gic = &gic_data[0];
354 void __iomem *cpu_base = gic_data_cpu_base(gic);
355
356 do {
357 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
358 irqnr = irqstat & GICC_IAR_INT_ID_MASK;
359
360 if (likely(irqnr > 15 && irqnr < 1020)) {
361 if (static_branch_likely(&supports_deactivate_key))
362 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
363 isb();
364 handle_domain_irq(gic->domain, irqnr, regs);
365 continue;
366 }
367 if (irqnr < 16) {
368 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
369 if (static_branch_likely(&supports_deactivate_key))
370 writel_relaxed(irqstat, cpu_base + GIC_CPU_DEACTIVATE);
371#ifdef CONFIG_SMP
372 /*
373 * Ensure any shared data written by the CPU sending
374 * the IPI is read after we've read the ACK register
375 * on the GIC.
376 *
377 * Pairs with the write barrier in gic_raise_softirq
378 */
379 smp_rmb();
380 handle_IPI(irqnr, regs);
381#endif
382 continue;
383 }
384 break;
385 } while (1);
386}
387
388static void gic_handle_cascade_irq(struct irq_desc *desc)
389{
390 struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc);
391 struct irq_chip *chip = irq_desc_get_chip(desc);
392 unsigned int cascade_irq, gic_irq;
393 unsigned long status;
394
395 chained_irq_enter(chip, desc);
396
397 status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
398
399 gic_irq = (status & GICC_IAR_INT_ID_MASK);
400 if (gic_irq == GICC_INT_SPURIOUS)
401 goto out;
402
403 cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
404 if (unlikely(gic_irq < 32 || gic_irq > 1020)) {
405 handle_bad_irq(desc);
406 } else {
407 isb();
408 generic_handle_irq(cascade_irq);
409 }
410
411 out:
412 chained_irq_exit(chip, desc);
413}
414
415static const struct irq_chip gic_chip = {
416 .irq_mask = gic_mask_irq,
417 .irq_unmask = gic_unmask_irq,
418 .irq_eoi = gic_eoi_irq,
419 .irq_set_type = gic_set_type,
420 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
421 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
422 .flags = IRQCHIP_SET_TYPE_MASKED |
423 IRQCHIP_SKIP_SET_WAKE |
424 IRQCHIP_MASK_ON_SUSPEND,
425};
426
427void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
428{
429 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
430 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq,
431 &gic_data[gic_nr]);
432}
433
434static u8 gic_get_cpumask(struct gic_chip_data *gic)
435{
436 void __iomem *base = gic_data_dist_base(gic);
437 u32 mask, i;
438
439 for (i = mask = 0; i < 32; i += 4) {
440 mask = readl_relaxed(base + GIC_DIST_TARGET + i);
441 mask |= mask >> 16;
442 mask |= mask >> 8;
443 if (mask)
444 break;
445 }
446
447 if (!mask && num_possible_cpus() > 1)
448 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
449
450 return mask;
451}
452
453static bool gic_check_gicv2(void __iomem *base)
454{
455 u32 val = readl_relaxed(base + GIC_CPU_IDENT);
456 return (val & 0xff0fff) == 0x02043B;
457}
458
459static void gic_cpu_if_up(struct gic_chip_data *gic)
460{
461 void __iomem *cpu_base = gic_data_cpu_base(gic);
462 u32 bypass = 0;
463 u32 mode = 0;
464 int i;
465
466 if (gic == &gic_data[0] && static_branch_likely(&supports_deactivate_key))
467 mode = GIC_CPU_CTRL_EOImodeNS;
468
469 if (gic_check_gicv2(cpu_base))
470 for (i = 0; i < 4; i++)
471 writel_relaxed(0, cpu_base + GIC_CPU_ACTIVEPRIO + i * 4);
472
473 /*
474 * Preserve bypass disable bits to be written back later
475 */
476 bypass = readl(cpu_base + GIC_CPU_CTRL);
477 bypass &= GICC_DIS_BYPASS_MASK;
478
479 writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL);
480}
481
482
483static void gic_dist_init(struct gic_chip_data *gic)
484{
485 unsigned int i;
486 u32 cpumask;
487 unsigned int gic_irqs = gic->gic_irqs;
488 void __iomem *base = gic_data_dist_base(gic);
489
490 writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL);
491
492 /*
493 * Set all global interrupts to this CPU only.
494 */
495 cpumask = gic_get_cpumask(gic);
496 cpumask |= cpumask << 8;
497 cpumask |= cpumask << 16;
498 for (i = 32; i < gic_irqs; i += 4)
499 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
500
501 gic_dist_config(base, gic_irqs, NULL);
502
503 writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
504}
505
506static int gic_cpu_init(struct gic_chip_data *gic)
507{
508 void __iomem *dist_base = gic_data_dist_base(gic);
509 void __iomem *base = gic_data_cpu_base(gic);
510 unsigned int cpu_mask, cpu = smp_processor_id();
511 int i;
512
513 /*
514 * Setting up the CPU map is only relevant for the primary GIC
515 * because any nested/secondary GICs do not directly interface
516 * with the CPU(s).
517 */
518 if (gic == &gic_data[0]) {
519 /*
520 * Get what the GIC says our CPU mask is.
521 */
522 if (WARN_ON(cpu >= NR_GIC_CPU_IF))
523 return -EINVAL;
524
525 gic_check_cpu_features();
526 cpu_mask = gic_get_cpumask(gic);
527 gic_cpu_map[cpu] = cpu_mask;
528
529 /*
530 * Clear our mask from the other map entries in case they're
531 * still undefined.
532 */
533 for (i = 0; i < NR_GIC_CPU_IF; i++)
534 if (i != cpu)
535 gic_cpu_map[i] &= ~cpu_mask;
536 }
537
538 gic_cpu_config(dist_base, 32, NULL);
539
540 writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
541 gic_cpu_if_up(gic);
542
543 return 0;
544}
545
546int gic_cpu_if_down(unsigned int gic_nr)
547{
548 void __iomem *cpu_base;
549 u32 val = 0;
550
551 if (gic_nr >= CONFIG_ARM_GIC_MAX_NR)
552 return -EINVAL;
553
554 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
555 val = readl(cpu_base + GIC_CPU_CTRL);
556 val &= ~GICC_ENABLE;
557 writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
558
559 return 0;
560}
561
562#if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM)
563/*
564 * Saves the GIC distributor registers during suspend or idle. Must be called
565 * with interrupts disabled but before powering down the GIC. After calling
566 * this function, no interrupts will be delivered by the GIC, and another
567 * platform-specific wakeup source must be enabled.
568 */
569void gic_dist_save(struct gic_chip_data *gic)
570{
571 unsigned int gic_irqs;
572 void __iomem *dist_base;
573 int i;
574
575 if (WARN_ON(!gic))
576 return;
577
578 gic_irqs = gic->gic_irqs;
579 dist_base = gic_data_dist_base(gic);
580
581 if (!dist_base)
582 return;
583
584 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
585 gic->saved_spi_conf[i] =
586 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
587
588 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
589 gic->saved_spi_target[i] =
590 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
591
592 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
593 gic->saved_spi_enable[i] =
594 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
595
596 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
597 gic->saved_spi_active[i] =
598 readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
599}
600
601/*
602 * Restores the GIC distributor registers during resume or when coming out of
603 * idle. Must be called before enabling interrupts. If a level interrupt
604 * that occurred while the GIC was suspended is still present, it will be
605 * handled normally, but any edge interrupts that occurred will not be seen by
606 * the GIC and need to be handled by the platform-specific wakeup source.
607 */
608void gic_dist_restore(struct gic_chip_data *gic)
609{
610 unsigned int gic_irqs;
611 unsigned int i;
612 void __iomem *dist_base;
613
614 if (WARN_ON(!gic))
615 return;
616
617 gic_irqs = gic->gic_irqs;
618 dist_base = gic_data_dist_base(gic);
619
620 if (!dist_base)
621 return;
622
623 writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
624
625 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
626 writel_relaxed(gic->saved_spi_conf[i],
627 dist_base + GIC_DIST_CONFIG + i * 4);
628
629 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
630 writel_relaxed(GICD_INT_DEF_PRI_X4,
631 dist_base + GIC_DIST_PRI + i * 4);
632
633 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
634 writel_relaxed(gic->saved_spi_target[i],
635 dist_base + GIC_DIST_TARGET + i * 4);
636
637 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
638 writel_relaxed(GICD_INT_EN_CLR_X32,
639 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
640 writel_relaxed(gic->saved_spi_enable[i],
641 dist_base + GIC_DIST_ENABLE_SET + i * 4);
642 }
643
644 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
645 writel_relaxed(GICD_INT_EN_CLR_X32,
646 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
647 writel_relaxed(gic->saved_spi_active[i],
648 dist_base + GIC_DIST_ACTIVE_SET + i * 4);
649 }
650
651 writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
652}
653
654void gic_cpu_save(struct gic_chip_data *gic)
655{
656 int i;
657 u32 *ptr;
658 void __iomem *dist_base;
659 void __iomem *cpu_base;
660
661 if (WARN_ON(!gic))
662 return;
663
664 dist_base = gic_data_dist_base(gic);
665 cpu_base = gic_data_cpu_base(gic);
666
667 if (!dist_base || !cpu_base)
668 return;
669
670 ptr = raw_cpu_ptr(gic->saved_ppi_enable);
671 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
672 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
673
674 ptr = raw_cpu_ptr(gic->saved_ppi_active);
675 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
676 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
677
678 ptr = raw_cpu_ptr(gic->saved_ppi_conf);
679 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
680 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
681
682}
683
684void gic_cpu_restore(struct gic_chip_data *gic)
685{
686 int i;
687 u32 *ptr;
688 void __iomem *dist_base;
689 void __iomem *cpu_base;
690
691 if (WARN_ON(!gic))
692 return;
693
694 dist_base = gic_data_dist_base(gic);
695 cpu_base = gic_data_cpu_base(gic);
696
697 if (!dist_base || !cpu_base)
698 return;
699
700 ptr = raw_cpu_ptr(gic->saved_ppi_enable);
701 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
702 writel_relaxed(GICD_INT_EN_CLR_X32,
703 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
704 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
705 }
706
707 ptr = raw_cpu_ptr(gic->saved_ppi_active);
708 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
709 writel_relaxed(GICD_INT_EN_CLR_X32,
710 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
711 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
712 }
713
714 ptr = raw_cpu_ptr(gic->saved_ppi_conf);
715 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
716 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
717
718 for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
719 writel_relaxed(GICD_INT_DEF_PRI_X4,
720 dist_base + GIC_DIST_PRI + i * 4);
721
722 writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
723 gic_cpu_if_up(gic);
724}
725
726static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
727{
728 int i;
729
730 for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
731#ifdef CONFIG_GIC_NON_BANKED
732 /* Skip over unused GICs */
733 if (!gic_data[i].get_base)
734 continue;
735#endif
736 switch (cmd) {
737 case CPU_PM_ENTER:
738 gic_cpu_save(&gic_data[i]);
739 break;
740 case CPU_PM_ENTER_FAILED:
741 case CPU_PM_EXIT:
742 gic_cpu_restore(&gic_data[i]);
743 break;
744 case CPU_CLUSTER_PM_ENTER:
745 gic_dist_save(&gic_data[i]);
746 break;
747 case CPU_CLUSTER_PM_ENTER_FAILED:
748 case CPU_CLUSTER_PM_EXIT:
749 gic_dist_restore(&gic_data[i]);
750 break;
751 }
752 }
753
754 return NOTIFY_OK;
755}
756
757static struct notifier_block gic_notifier_block = {
758 .notifier_call = gic_notifier,
759};
760
761static int gic_pm_init(struct gic_chip_data *gic)
762{
763 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
764 sizeof(u32));
765 if (WARN_ON(!gic->saved_ppi_enable))
766 return -ENOMEM;
767
768 gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
769 sizeof(u32));
770 if (WARN_ON(!gic->saved_ppi_active))
771 goto free_ppi_enable;
772
773 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
774 sizeof(u32));
775 if (WARN_ON(!gic->saved_ppi_conf))
776 goto free_ppi_active;
777
778 if (gic == &gic_data[0])
779 cpu_pm_register_notifier(&gic_notifier_block);
780
781 return 0;
782
783free_ppi_active:
784 free_percpu(gic->saved_ppi_active);
785free_ppi_enable:
786 free_percpu(gic->saved_ppi_enable);
787
788 return -ENOMEM;
789}
790#else
791static int gic_pm_init(struct gic_chip_data *gic)
792{
793 return 0;
794}
795#endif
796
797#ifdef CONFIG_SMP
798static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
799{
800 int cpu;
801 unsigned long flags, map = 0;
802
803 if (unlikely(nr_cpu_ids == 1)) {
804 /* Only one CPU? let's do a self-IPI... */
805 writel_relaxed(2 << 24 | irq,
806 gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
807 return;
808 }
809
810 gic_lock_irqsave(flags);
811
812 /* Convert our logical CPU mask into a physical one. */
813 for_each_cpu(cpu, mask)
814 map |= gic_cpu_map[cpu];
815
816 /*
817 * Ensure that stores to Normal memory are visible to the
818 * other CPUs before they observe us issuing the IPI.
819 */
820 dmb(ishst);
821
822 /* this always happens on GIC0 */
823 writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
824
825 gic_unlock_irqrestore(flags);
826}
827#endif
828
829#ifdef CONFIG_BL_SWITCHER
830/*
831 * gic_send_sgi - send a SGI directly to given CPU interface number
832 *
833 * cpu_id: the ID for the destination CPU interface
834 * irq: the IPI number to send a SGI for
835 */
836void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
837{
838 BUG_ON(cpu_id >= NR_GIC_CPU_IF);
839 cpu_id = 1 << cpu_id;
840 /* this always happens on GIC0 */
841 writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
842}
843
844/*
845 * gic_get_cpu_id - get the CPU interface ID for the specified CPU
846 *
847 * @cpu: the logical CPU number to get the GIC ID for.
848 *
849 * Return the CPU interface ID for the given logical CPU number,
850 * or -1 if the CPU number is too large or the interface ID is
851 * unknown (more than one bit set).
852 */
853int gic_get_cpu_id(unsigned int cpu)
854{
855 unsigned int cpu_bit;
856
857 if (cpu >= NR_GIC_CPU_IF)
858 return -1;
859 cpu_bit = gic_cpu_map[cpu];
860 if (cpu_bit & (cpu_bit - 1))
861 return -1;
862 return __ffs(cpu_bit);
863}
864
865/*
866 * gic_migrate_target - migrate IRQs to another CPU interface
867 *
868 * @new_cpu_id: the CPU target ID to migrate IRQs to
869 *
870 * Migrate all peripheral interrupts with a target matching the current CPU
871 * to the interface corresponding to @new_cpu_id. The CPU interface mapping
872 * is also updated. Targets to other CPU interfaces are unchanged.
873 * This must be called with IRQs locally disabled.
874 */
875void gic_migrate_target(unsigned int new_cpu_id)
876{
877 unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
878 void __iomem *dist_base;
879 int i, ror_val, cpu = smp_processor_id();
880 u32 val, cur_target_mask, active_mask;
881
882 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
883
884 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
885 if (!dist_base)
886 return;
887 gic_irqs = gic_data[gic_nr].gic_irqs;
888
889 cur_cpu_id = __ffs(gic_cpu_map[cpu]);
890 cur_target_mask = 0x01010101 << cur_cpu_id;
891 ror_val = (cur_cpu_id - new_cpu_id) & 31;
892
893 gic_lock();
894
895 /* Update the target interface for this logical CPU */
896 gic_cpu_map[cpu] = 1 << new_cpu_id;
897
898 /*
899 * Find all the peripheral interrupts targeting the current
900 * CPU interface and migrate them to the new CPU interface.
901 * We skip DIST_TARGET 0 to 7 as they are read-only.
902 */
903 for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
904 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
905 active_mask = val & cur_target_mask;
906 if (active_mask) {
907 val &= ~active_mask;
908 val |= ror32(active_mask, ror_val);
909 writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
910 }
911 }
912
913 gic_unlock();
914
915 /*
916 * Now let's migrate and clear any potential SGIs that might be
917 * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET
918 * is a banked register, we can only forward the SGI using
919 * GIC_DIST_SOFTINT. The original SGI source is lost but Linux
920 * doesn't use that information anyway.
921 *
922 * For the same reason we do not adjust SGI source information
923 * for previously sent SGIs by us to other CPUs either.
924 */
925 for (i = 0; i < 16; i += 4) {
926 int j;
927 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
928 if (!val)
929 continue;
930 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
931 for (j = i; j < i + 4; j++) {
932 if (val & 0xff)
933 writel_relaxed((1 << (new_cpu_id + 16)) | j,
934 dist_base + GIC_DIST_SOFTINT);
935 val >>= 8;
936 }
937 }
938}
939
940/*
941 * gic_get_sgir_physaddr - get the physical address for the SGI register
942 *
943 * REturn the physical address of the SGI register to be used
944 * by some early assembly code when the kernel is not yet available.
945 */
946static unsigned long gic_dist_physaddr;
947
948unsigned long gic_get_sgir_physaddr(void)
949{
950 if (!gic_dist_physaddr)
951 return 0;
952 return gic_dist_physaddr + GIC_DIST_SOFTINT;
953}
954
955static void __init gic_init_physaddr(struct device_node *node)
956{
957 struct resource res;
958 if (of_address_to_resource(node, 0, &res) == 0) {
959 gic_dist_physaddr = res.start;
960 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
961 }
962}
963
964#else
965#define gic_init_physaddr(node) do { } while (0)
966#endif
967
968static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
969 irq_hw_number_t hw)
970{
971 struct gic_chip_data *gic = d->host_data;
972
973 if (hw < 32) {
974 irq_set_percpu_devid(irq);
975 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
976 handle_percpu_devid_irq, NULL, NULL);
977 } else {
978 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
979 handle_fasteoi_irq, NULL, NULL);
980 irq_set_probe(irq);
981 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
982 }
983 return 0;
984}
985
986static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
987{
988}
989
990static int gic_irq_domain_translate(struct irq_domain *d,
991 struct irq_fwspec *fwspec,
992 unsigned long *hwirq,
993 unsigned int *type)
994{
995 if (is_of_node(fwspec->fwnode)) {
996 if (fwspec->param_count < 3)
997 return -EINVAL;
998
999 /* Get the interrupt number and add 16 to skip over SGIs */
1000 *hwirq = fwspec->param[1] + 16;
1001
1002 /*
1003 * For SPIs, we need to add 16 more to get the GIC irq
1004 * ID number
1005 */
1006 if (!fwspec->param[0])
1007 *hwirq += 16;
1008
1009 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1010
1011 /* Make it clear that broken DTs are... broken */
1012 WARN_ON(*type == IRQ_TYPE_NONE);
1013 return 0;
1014 }
1015
1016 if (is_fwnode_irqchip(fwspec->fwnode)) {
1017 if(fwspec->param_count != 2)
1018 return -EINVAL;
1019
1020 *hwirq = fwspec->param[0];
1021 *type = fwspec->param[1];
1022
1023 WARN_ON(*type == IRQ_TYPE_NONE);
1024 return 0;
1025 }
1026
1027 return -EINVAL;
1028}
1029
1030static int gic_starting_cpu(unsigned int cpu)
1031{
1032 gic_cpu_init(&gic_data[0]);
1033 return 0;
1034}
1035
1036static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
1037 unsigned int nr_irqs, void *arg)
1038{
1039 int i, ret;
1040 irq_hw_number_t hwirq;
1041 unsigned int type = IRQ_TYPE_NONE;
1042 struct irq_fwspec *fwspec = arg;
1043
1044 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
1045 if (ret)
1046 return ret;
1047
1048 for (i = 0; i < nr_irqs; i++) {
1049 ret = gic_irq_domain_map(domain, virq + i, hwirq + i);
1050 if (ret)
1051 return ret;
1052 }
1053
1054 return 0;
1055}
1056
1057static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
1058 .translate = gic_irq_domain_translate,
1059 .alloc = gic_irq_domain_alloc,
1060 .free = irq_domain_free_irqs_top,
1061};
1062
1063static const struct irq_domain_ops gic_irq_domain_ops = {
1064 .map = gic_irq_domain_map,
1065 .unmap = gic_irq_domain_unmap,
1066};
1067
1068static void gic_init_chip(struct gic_chip_data *gic, struct device *dev,
1069 const char *name, bool use_eoimode1)
1070{
1071 /* Initialize irq_chip */
1072 gic->chip = gic_chip;
1073 gic->chip.name = name;
1074 gic->chip.parent_device = dev;
1075
1076 if (use_eoimode1) {
1077 gic->chip.irq_mask = gic_eoimode1_mask_irq;
1078 gic->chip.irq_eoi = gic_eoimode1_eoi_irq;
1079 gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
1080 }
1081
1082#ifdef CONFIG_SMP
1083 if (gic == &gic_data[0])
1084 gic->chip.irq_set_affinity = gic_set_affinity;
1085#endif
1086}
1087
1088static int gic_init_bases(struct gic_chip_data *gic,
1089 struct fwnode_handle *handle)
1090{
1091 int gic_irqs, ret;
1092
1093 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
1094 /* Frankein-GIC without banked registers... */
1095 unsigned int cpu;
1096
1097 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
1098 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
1099 if (WARN_ON(!gic->dist_base.percpu_base ||
1100 !gic->cpu_base.percpu_base)) {
1101 ret = -ENOMEM;
1102 goto error;
1103 }
1104
1105 for_each_possible_cpu(cpu) {
1106 u32 mpidr = cpu_logical_map(cpu);
1107 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
1108 unsigned long offset = gic->percpu_offset * core_id;
1109 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) =
1110 gic->raw_dist_base + offset;
1111 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) =
1112 gic->raw_cpu_base + offset;
1113 }
1114
1115 gic_set_base_accessor(gic, gic_get_percpu_base);
1116 } else {
1117 /* Normal, sane GIC... */
1118 WARN(gic->percpu_offset,
1119 "GIC_NON_BANKED not enabled, ignoring %08x offset!",
1120 gic->percpu_offset);
1121 gic->dist_base.common_base = gic->raw_dist_base;
1122 gic->cpu_base.common_base = gic->raw_cpu_base;
1123 gic_set_base_accessor(gic, gic_get_common_base);
1124 }
1125
1126 /*
1127 * Find out how many interrupts are supported.
1128 * The GIC only supports up to 1020 interrupt sources.
1129 */
1130 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
1131 gic_irqs = (gic_irqs + 1) * 32;
1132 if (gic_irqs > 1020)
1133 gic_irqs = 1020;
1134 gic->gic_irqs = gic_irqs;
1135
1136 if (handle) { /* DT/ACPI */
1137 gic->domain = irq_domain_create_linear(handle, gic_irqs,
1138 &gic_irq_domain_hierarchy_ops,
1139 gic);
1140 } else { /* Legacy support */
1141 /*
1142 * For primary GICs, skip over SGIs.
1143 * No secondary GIC support whatsoever.
1144 */
1145 int irq_base;
1146
1147 gic_irqs -= 16; /* calculate # of irqs to allocate */
1148
1149 irq_base = irq_alloc_descs(16, 16, gic_irqs,
1150 numa_node_id());
1151 if (irq_base < 0) {
1152 WARN(1, "Cannot allocate irq_descs @ IRQ16, assuming pre-allocated\n");
1153 irq_base = 16;
1154 }
1155
1156 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
1157 16, &gic_irq_domain_ops, gic);
1158 }
1159
1160 if (WARN_ON(!gic->domain)) {
1161 ret = -ENODEV;
1162 goto error;
1163 }
1164
1165 gic_dist_init(gic);
1166 ret = gic_cpu_init(gic);
1167 if (ret)
1168 goto error;
1169
1170 ret = gic_pm_init(gic);
1171 if (ret)
1172 goto error;
1173
1174 return 0;
1175
1176error:
1177 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
1178 free_percpu(gic->dist_base.percpu_base);
1179 free_percpu(gic->cpu_base.percpu_base);
1180 }
1181
1182 return ret;
1183}
1184
1185static int __init __gic_init_bases(struct gic_chip_data *gic,
1186 struct fwnode_handle *handle)
1187{
1188 char *name;
1189 int i, ret;
1190
1191 if (WARN_ON(!gic || gic->domain))
1192 return -EINVAL;
1193
1194 if (gic == &gic_data[0]) {
1195 /*
1196 * Initialize the CPU interface map to all CPUs.
1197 * It will be refined as each CPU probes its ID.
1198 * This is only necessary for the primary GIC.
1199 */
1200 for (i = 0; i < NR_GIC_CPU_IF; i++)
1201 gic_cpu_map[i] = 0xff;
1202#ifdef CONFIG_SMP
1203 set_smp_cross_call(gic_raise_softirq);
1204#endif
1205 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
1206 "irqchip/arm/gic:starting",
1207 gic_starting_cpu, NULL);
1208 set_handle_irq(gic_handle_irq);
1209 if (static_branch_likely(&supports_deactivate_key))
1210 pr_info("GIC: Using split EOI/Deactivate mode\n");
1211 }
1212
1213 if (static_branch_likely(&supports_deactivate_key) && gic == &gic_data[0]) {
1214 name = kasprintf(GFP_KERNEL, "GICv2");
1215 gic_init_chip(gic, NULL, name, true);
1216 } else {
1217 name = kasprintf(GFP_KERNEL, "GIC-%d", (int)(gic-&gic_data[0]));
1218 gic_init_chip(gic, NULL, name, false);
1219 }
1220
1221 ret = gic_init_bases(gic, handle);
1222 if (ret)
1223 kfree(name);
1224
1225 return ret;
1226}
1227
1228void __init gic_init(void __iomem *dist_base, void __iomem *cpu_base)
1229{
1230 struct gic_chip_data *gic;
1231
1232 /*
1233 * Non-DT/ACPI systems won't run a hypervisor, so let's not
1234 * bother with these...
1235 */
1236 static_branch_disable(&supports_deactivate_key);
1237
1238 gic = &gic_data[0];
1239 gic->raw_dist_base = dist_base;
1240 gic->raw_cpu_base = cpu_base;
1241
1242 __gic_init_bases(gic, NULL);
1243}
1244
1245static void gic_teardown(struct gic_chip_data *gic)
1246{
1247 if (WARN_ON(!gic))
1248 return;
1249
1250 if (gic->raw_dist_base)
1251 iounmap(gic->raw_dist_base);
1252 if (gic->raw_cpu_base)
1253 iounmap(gic->raw_cpu_base);
1254}
1255
1256#ifdef CONFIG_OF
1257static int gic_cnt __initdata;
1258static bool gicv2_force_probe;
1259
1260static int __init gicv2_force_probe_cfg(char *buf)
1261{
1262 return strtobool(buf, &gicv2_force_probe);
1263}
1264early_param("irqchip.gicv2_force_probe", gicv2_force_probe_cfg);
1265
1266static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
1267{
1268 struct resource cpuif_res;
1269
1270 of_address_to_resource(node, 1, &cpuif_res);
1271
1272 if (!is_hyp_mode_available())
1273 return false;
1274 if (resource_size(&cpuif_res) < SZ_8K) {
1275 void __iomem *alt;
1276 /*
1277 * Check for a stupid firmware that only exposes the
1278 * first page of a GICv2.
1279 */
1280 if (!gic_check_gicv2(*base))
1281 return false;
1282
1283 if (!gicv2_force_probe) {
1284 pr_warn("GIC: GICv2 detected, but range too small and irqchip.gicv2_force_probe not set\n");
1285 return false;
1286 }
1287
1288 alt = ioremap(cpuif_res.start, SZ_8K);
1289 if (!alt)
1290 return false;
1291 if (!gic_check_gicv2(alt + SZ_4K)) {
1292 /*
1293 * The first page was that of a GICv2, and
1294 * the second was *something*. Let's trust it
1295 * to be a GICv2, and update the mapping.
1296 */
1297 pr_warn("GIC: GICv2 at %pa, but range is too small (broken DT?), assuming 8kB\n",
1298 &cpuif_res.start);
1299 iounmap(*base);
1300 *base = alt;
1301 return true;
1302 }
1303
1304 /*
1305 * We detected *two* initial GICv2 pages in a
1306 * row. Could be a GICv2 aliased over two 64kB
1307 * pages. Update the resource, map the iospace, and
1308 * pray.
1309 */
1310 iounmap(alt);
1311 alt = ioremap(cpuif_res.start, SZ_128K);
1312 if (!alt)
1313 return false;
1314 pr_warn("GIC: Aliased GICv2 at %pa, trying to find the canonical range over 128kB\n",
1315 &cpuif_res.start);
1316 cpuif_res.end = cpuif_res.start + SZ_128K -1;
1317 iounmap(*base);
1318 *base = alt;
1319 }
1320 if (resource_size(&cpuif_res) == SZ_128K) {
1321 /*
1322 * Verify that we have the first 4kB of a GICv2
1323 * aliased over the first 64kB by checking the
1324 * GICC_IIDR register on both ends.
1325 */
1326 if (!gic_check_gicv2(*base) ||
1327 !gic_check_gicv2(*base + 0xf000))
1328 return false;
1329
1330 /*
1331 * Move the base up by 60kB, so that we have a 8kB
1332 * contiguous region, which allows us to use GICC_DIR
1333 * at its normal offset. Please pass me that bucket.
1334 */
1335 *base += 0xf000;
1336 cpuif_res.start += 0xf000;
1337 pr_warn("GIC: Adjusting CPU interface base to %pa\n",
1338 &cpuif_res.start);
1339 }
1340
1341 return true;
1342}
1343
1344static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node)
1345{
1346 if (!gic || !node)
1347 return -EINVAL;
1348
1349 gic->raw_dist_base = of_iomap(node, 0);
1350 if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n"))
1351 goto error;
1352
1353 gic->raw_cpu_base = of_iomap(node, 1);
1354 if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n"))
1355 goto error;
1356
1357 if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset))
1358 gic->percpu_offset = 0;
1359
1360 return 0;
1361
1362error:
1363 gic_teardown(gic);
1364
1365 return -ENOMEM;
1366}
1367
1368int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq)
1369{
1370 int ret;
1371
1372 if (!dev || !dev->of_node || !gic || !irq)
1373 return -EINVAL;
1374
1375 *gic = devm_kzalloc(dev, sizeof(**gic), GFP_KERNEL);
1376 if (!*gic)
1377 return -ENOMEM;
1378
1379 gic_init_chip(*gic, dev, dev->of_node->name, false);
1380
1381 ret = gic_of_setup(*gic, dev->of_node);
1382 if (ret)
1383 return ret;
1384
1385 ret = gic_init_bases(*gic, &dev->of_node->fwnode);
1386 if (ret) {
1387 gic_teardown(*gic);
1388 return ret;
1389 }
1390
1391 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, *gic);
1392
1393 return 0;
1394}
1395
1396static void __init gic_of_setup_kvm_info(struct device_node *node)
1397{
1398 int ret;
1399 struct resource *vctrl_res = &gic_v2_kvm_info.vctrl;
1400 struct resource *vcpu_res = &gic_v2_kvm_info.vcpu;
1401
1402 gic_v2_kvm_info.type = GIC_V2;
1403
1404 gic_v2_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1405 if (!gic_v2_kvm_info.maint_irq)
1406 return;
1407
1408 ret = of_address_to_resource(node, 2, vctrl_res);
1409 if (ret)
1410 return;
1411
1412 ret = of_address_to_resource(node, 3, vcpu_res);
1413 if (ret)
1414 return;
1415
1416 if (static_branch_likely(&supports_deactivate_key))
1417 gic_set_kvm_info(&gic_v2_kvm_info);
1418}
1419
1420int __init
1421gic_of_init(struct device_node *node, struct device_node *parent)
1422{
1423 struct gic_chip_data *gic;
1424 int irq, ret;
1425
1426 if (WARN_ON(!node))
1427 return -ENODEV;
1428
1429 if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR))
1430 return -EINVAL;
1431
1432 gic = &gic_data[gic_cnt];
1433
1434 ret = gic_of_setup(gic, node);
1435 if (ret)
1436 return ret;
1437
1438 /*
1439 * Disable split EOI/Deactivate if either HYP is not available
1440 * or the CPU interface is too small.
1441 */
1442 if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base))
1443 static_branch_disable(&supports_deactivate_key);
1444
1445 ret = __gic_init_bases(gic, &node->fwnode);
1446 if (ret) {
1447 gic_teardown(gic);
1448 return ret;
1449 }
1450
1451 if (!gic_cnt) {
1452 gic_init_physaddr(node);
1453 gic_of_setup_kvm_info(node);
1454 }
1455
1456 if (parent) {
1457 irq = irq_of_parse_and_map(node, 0);
1458 gic_cascade_irq(gic_cnt, irq);
1459 }
1460
1461 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1462 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
1463
1464 gic_cnt++;
1465 return 0;
1466}
1467IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
1468IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
1469IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
1470IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
1471IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
1472IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
1473IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
1474IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
1475IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
1476#else
1477int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq)
1478{
1479 return -ENOTSUPP;
1480}
1481#endif
1482
1483#ifdef CONFIG_ACPI
1484static struct
1485{
1486 phys_addr_t cpu_phys_base;
1487 u32 maint_irq;
1488 int maint_irq_mode;
1489 phys_addr_t vctrl_base;
1490 phys_addr_t vcpu_base;
1491} acpi_data __initdata;
1492
1493static int __init
1494gic_acpi_parse_madt_cpu(union acpi_subtable_headers *header,
1495 const unsigned long end)
1496{
1497 struct acpi_madt_generic_interrupt *processor;
1498 phys_addr_t gic_cpu_base;
1499 static int cpu_base_assigned;
1500
1501 processor = (struct acpi_madt_generic_interrupt *)header;
1502
1503 if (BAD_MADT_GICC_ENTRY(processor, end))
1504 return -EINVAL;
1505
1506 /*
1507 * There is no support for non-banked GICv1/2 register in ACPI spec.
1508 * All CPU interface addresses have to be the same.
1509 */
1510 gic_cpu_base = processor->base_address;
1511 if (cpu_base_assigned && gic_cpu_base != acpi_data.cpu_phys_base)
1512 return -EINVAL;
1513
1514 acpi_data.cpu_phys_base = gic_cpu_base;
1515 acpi_data.maint_irq = processor->vgic_interrupt;
1516 acpi_data.maint_irq_mode = (processor->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
1517 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
1518 acpi_data.vctrl_base = processor->gich_base_address;
1519 acpi_data.vcpu_base = processor->gicv_base_address;
1520
1521 cpu_base_assigned = 1;
1522 return 0;
1523}
1524
1525/* The things you have to do to just *count* something... */
1526static int __init acpi_dummy_func(union acpi_subtable_headers *header,
1527 const unsigned long end)
1528{
1529 return 0;
1530}
1531
1532static bool __init acpi_gic_redist_is_present(void)
1533{
1534 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1535 acpi_dummy_func, 0) > 0;
1536}
1537
1538static bool __init gic_validate_dist(struct acpi_subtable_header *header,
1539 struct acpi_probe_entry *ape)
1540{
1541 struct acpi_madt_generic_distributor *dist;
1542 dist = (struct acpi_madt_generic_distributor *)header;
1543
1544 return (dist->version == ape->driver_data &&
1545 (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
1546 !acpi_gic_redist_is_present()));
1547}
1548
1549#define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
1550#define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
1551#define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K)
1552#define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K)
1553
1554static void __init gic_acpi_setup_kvm_info(void)
1555{
1556 int irq;
1557 struct resource *vctrl_res = &gic_v2_kvm_info.vctrl;
1558 struct resource *vcpu_res = &gic_v2_kvm_info.vcpu;
1559
1560 gic_v2_kvm_info.type = GIC_V2;
1561
1562 if (!acpi_data.vctrl_base)
1563 return;
1564
1565 vctrl_res->flags = IORESOURCE_MEM;
1566 vctrl_res->start = acpi_data.vctrl_base;
1567 vctrl_res->end = vctrl_res->start + ACPI_GICV2_VCTRL_MEM_SIZE - 1;
1568
1569 if (!acpi_data.vcpu_base)
1570 return;
1571
1572 vcpu_res->flags = IORESOURCE_MEM;
1573 vcpu_res->start = acpi_data.vcpu_base;
1574 vcpu_res->end = vcpu_res->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
1575
1576 irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
1577 acpi_data.maint_irq_mode,
1578 ACPI_ACTIVE_HIGH);
1579 if (irq <= 0)
1580 return;
1581
1582 gic_v2_kvm_info.maint_irq = irq;
1583
1584 gic_set_kvm_info(&gic_v2_kvm_info);
1585}
1586
1587static int __init gic_v2_acpi_init(union acpi_subtable_headers *header,
1588 const unsigned long end)
1589{
1590 struct acpi_madt_generic_distributor *dist;
1591 struct fwnode_handle *domain_handle;
1592 struct gic_chip_data *gic = &gic_data[0];
1593 int count, ret;
1594
1595 /* Collect CPU base addresses */
1596 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1597 gic_acpi_parse_madt_cpu, 0);
1598 if (count <= 0) {
1599 pr_err("No valid GICC entries exist\n");
1600 return -EINVAL;
1601 }
1602
1603 gic->raw_cpu_base = ioremap(acpi_data.cpu_phys_base, ACPI_GIC_CPU_IF_MEM_SIZE);
1604 if (!gic->raw_cpu_base) {
1605 pr_err("Unable to map GICC registers\n");
1606 return -ENOMEM;
1607 }
1608
1609 dist = (struct acpi_madt_generic_distributor *)header;
1610 gic->raw_dist_base = ioremap(dist->base_address,
1611 ACPI_GICV2_DIST_MEM_SIZE);
1612 if (!gic->raw_dist_base) {
1613 pr_err("Unable to map GICD registers\n");
1614 gic_teardown(gic);
1615 return -ENOMEM;
1616 }
1617
1618 /*
1619 * Disable split EOI/Deactivate if HYP is not available. ACPI
1620 * guarantees that we'll always have a GICv2, so the CPU
1621 * interface will always be the right size.
1622 */
1623 if (!is_hyp_mode_available())
1624 static_branch_disable(&supports_deactivate_key);
1625
1626 /*
1627 * Initialize GIC instance zero (no multi-GIC support).
1628 */
1629 domain_handle = irq_domain_alloc_fwnode(&dist->base_address);
1630 if (!domain_handle) {
1631 pr_err("Unable to allocate domain handle\n");
1632 gic_teardown(gic);
1633 return -ENOMEM;
1634 }
1635
1636 ret = __gic_init_bases(gic, domain_handle);
1637 if (ret) {
1638 pr_err("Failed to initialise GIC\n");
1639 irq_domain_free_fwnode(domain_handle);
1640 gic_teardown(gic);
1641 return ret;
1642 }
1643
1644 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1645
1646 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1647 gicv2m_init(NULL, gic_data[0].domain);
1648
1649 if (static_branch_likely(&supports_deactivate_key))
1650 gic_acpi_setup_kvm_info();
1651
1652 return 0;
1653}
1654IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1655 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
1656 gic_v2_acpi_init);
1657IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1658 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,
1659 gic_v2_acpi_init);
1660#endif