2 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
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.
8 * Interrupt architecture for the GIC:
10 * o There is one Interrupt Distributor, which receives interrupts
11 * from system devices and sends them to the Interrupt Controllers.
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.
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.
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>
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>
45 #include <asm/cputype.h>
47 #include <asm/exception.h>
48 #include <asm/smp_plat.h>
51 #include "irq-gic-common.h"
54 #include <asm/cpufeature.h>
56 static void gic_check_cpu_features(void)
58 WARN_TAINT_ONCE(this_cpu_has_cap(ARM64_HAS_SYSREG_GIC_CPUIF),
59 TAINT_CPU_OUT_OF_SPEC,
60 "GICv3 system registers enabled, broken firmware!\n");
63 #define gic_check_cpu_features() do { } while(0)
67 void __iomem *common_base;
68 void __percpu * __iomem *percpu_base;
71 struct gic_chip_data {
73 union gic_base dist_base;
74 union gic_base cpu_base;
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;
84 struct irq_domain *domain;
85 unsigned int gic_irqs;
86 #ifdef CONFIG_GIC_NON_BANKED
87 void __iomem *(*get_base)(union gic_base *);
91 static DEFINE_RAW_SPINLOCK(irq_controller_lock);
94 * The GIC mapping of CPU interfaces does not necessarily match
95 * the logical CPU numbering. Let's use a mapping as returned
98 #define NR_GIC_CPU_IF 8
99 static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
101 static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
103 static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly;
105 #ifdef CONFIG_GIC_NON_BANKED
106 static void __iomem *gic_get_percpu_base(union gic_base *base)
108 return raw_cpu_read(*base->percpu_base);
111 static void __iomem *gic_get_common_base(union gic_base *base)
113 return base->common_base;
116 static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
118 return data->get_base(&data->dist_base);
121 static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
123 return data->get_base(&data->cpu_base);
126 static inline void gic_set_base_accessor(struct gic_chip_data *data,
127 void __iomem *(*f)(union gic_base *))
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)
137 static inline void __iomem *gic_dist_base(struct irq_data *d)
139 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
140 return gic_data_dist_base(gic_data);
143 static inline void __iomem *gic_cpu_base(struct irq_data *d)
145 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
146 return gic_data_cpu_base(gic_data);
149 static inline unsigned int gic_irq(struct irq_data *d)
154 static inline bool cascading_gic_irq(struct irq_data *d)
156 void *data = irq_data_get_irq_handler_data(d);
159 * If handler_data is set, this is a cascading interrupt, and
160 * it cannot possibly be forwarded.
166 * Routines to acknowledge, disable and enable interrupts
168 static void gic_poke_irq(struct irq_data *d, u32 offset)
170 u32 mask = 1 << (gic_irq(d) % 32);
171 writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4);
174 static int gic_peek_irq(struct irq_data *d, u32 offset)
176 u32 mask = 1 << (gic_irq(d) % 32);
177 return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask);
180 static void gic_mask_irq(struct irq_data *d)
182 gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR);
185 static void gic_eoimode1_mask_irq(struct irq_data *d)
189 * When masking a forwarded interrupt, make sure it is
190 * deactivated as well.
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).
196 if (irqd_is_forwarded_to_vcpu(d))
197 gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR);
200 static void gic_unmask_irq(struct irq_data *d)
202 gic_poke_irq(d, GIC_DIST_ENABLE_SET);
205 static void gic_eoi_irq(struct irq_data *d)
207 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
210 static void gic_eoimode1_eoi_irq(struct irq_data *d)
212 /* Do not deactivate an IRQ forwarded to a vcpu. */
213 if (irqd_is_forwarded_to_vcpu(d))
216 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
219 static int gic_irq_set_irqchip_state(struct irq_data *d,
220 enum irqchip_irq_state which, bool val)
225 case IRQCHIP_STATE_PENDING:
226 reg = val ? GIC_DIST_PENDING_SET : GIC_DIST_PENDING_CLEAR;
229 case IRQCHIP_STATE_ACTIVE:
230 reg = val ? GIC_DIST_ACTIVE_SET : GIC_DIST_ACTIVE_CLEAR;
233 case IRQCHIP_STATE_MASKED:
234 reg = val ? GIC_DIST_ENABLE_CLEAR : GIC_DIST_ENABLE_SET;
241 gic_poke_irq(d, reg);
245 static int gic_irq_get_irqchip_state(struct irq_data *d,
246 enum irqchip_irq_state which, bool *val)
249 case IRQCHIP_STATE_PENDING:
250 *val = gic_peek_irq(d, GIC_DIST_PENDING_SET);
253 case IRQCHIP_STATE_ACTIVE:
254 *val = gic_peek_irq(d, GIC_DIST_ACTIVE_SET);
257 case IRQCHIP_STATE_MASKED:
258 *val = !gic_peek_irq(d, GIC_DIST_ENABLE_SET);
268 static int gic_set_type(struct irq_data *d, unsigned int type)
270 void __iomem *base = gic_dist_base(d);
271 unsigned int gicirq = gic_irq(d);
273 /* Interrupt configuration for SGIs can't be changed */
277 /* SPIs have restrictions on the supported types */
278 if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
279 type != IRQ_TYPE_EDGE_RISING)
282 return gic_configure_irq(gicirq, type, base, NULL);
285 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
287 /* Only interrupts on the primary GIC can be forwarded to a vcpu. */
288 if (cascading_gic_irq(d))
292 irqd_set_forwarded_to_vcpu(d);
294 irqd_clr_forwarded_to_vcpu(d);
299 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
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;
308 cpu = cpumask_any_and(mask_val, cpu_online_mask);
310 cpu = cpumask_first(mask_val);
312 if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
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);
322 return IRQ_SET_MASK_OK_DONE;
326 static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
329 struct gic_chip_data *gic = &gic_data[0];
330 void __iomem *cpu_base = gic_data_cpu_base(gic);
333 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
334 irqnr = irqstat & GICC_IAR_INT_ID_MASK;
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);
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);
347 handle_IPI(irqnr, regs);
355 static void gic_handle_cascade_irq(struct irq_desc *desc)
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;
362 chained_irq_enter(chip, desc);
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);
368 gic_irq = (status & GICC_IAR_INT_ID_MASK);
369 if (gic_irq == GICC_INT_SPURIOUS)
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);
376 generic_handle_irq(cascade_irq);
379 chained_irq_exit(chip, desc);
382 static 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,
394 static struct irq_chip gic_eoimode1_chip = {
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,
408 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
410 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
411 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq,
415 static u8 gic_get_cpumask(struct gic_chip_data *gic)
417 void __iomem *base = gic_data_dist_base(gic);
420 for (i = mask = 0; i < 32; i += 4) {
421 mask = readl_relaxed(base + GIC_DIST_TARGET + i);
428 if (!mask && num_possible_cpus() > 1)
429 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
434 static void gic_cpu_if_up(struct gic_chip_data *gic)
436 void __iomem *cpu_base = gic_data_cpu_base(gic);
440 if (gic == &gic_data[0] && static_key_true(&supports_deactivate))
441 mode = GIC_CPU_CTRL_EOImodeNS;
444 * Preserve bypass disable bits to be written back later
446 bypass = readl(cpu_base + GIC_CPU_CTRL);
447 bypass &= GICC_DIS_BYPASS_MASK;
449 writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL);
453 static void __init gic_dist_init(struct gic_chip_data *gic)
457 unsigned int gic_irqs = gic->gic_irqs;
458 void __iomem *base = gic_data_dist_base(gic);
460 writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL);
463 * Set all global interrupts to this CPU only.
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);
471 gic_dist_config(base, gic_irqs, NULL);
473 writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
476 static void gic_cpu_init(struct gic_chip_data *gic)
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();
484 * Setting up the CPU map is only relevant for the primary GIC
485 * because any nested/secondary GICs do not directly interface
488 if (gic == &gic_data[0]) {
490 * Get what the GIC says our CPU mask is.
492 BUG_ON(cpu >= NR_GIC_CPU_IF);
493 gic_check_cpu_features();
494 cpu_mask = gic_get_cpumask(gic);
495 gic_cpu_map[cpu] = cpu_mask;
498 * Clear our mask from the other map entries in case they're
501 for (i = 0; i < NR_GIC_CPU_IF; i++)
503 gic_cpu_map[i] &= ~cpu_mask;
506 gic_cpu_config(dist_base, NULL);
508 writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
512 int gic_cpu_if_down(unsigned int gic_nr)
514 void __iomem *cpu_base;
517 if (gic_nr >= CONFIG_ARM_GIC_MAX_NR)
520 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
521 val = readl(cpu_base + GIC_CPU_CTRL);
523 writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
530 * Saves the GIC distributor registers during suspend or idle. Must be called
531 * with interrupts disabled but before powering down the GIC. After calling
532 * this function, no interrupts will be delivered by the GIC, and another
533 * platform-specific wakeup source must be enabled.
535 static void gic_dist_save(unsigned int gic_nr)
537 unsigned int gic_irqs;
538 void __iomem *dist_base;
541 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
543 gic_irqs = gic_data[gic_nr].gic_irqs;
544 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
549 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
550 gic_data[gic_nr].saved_spi_conf[i] =
551 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
553 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
554 gic_data[gic_nr].saved_spi_target[i] =
555 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
557 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
558 gic_data[gic_nr].saved_spi_enable[i] =
559 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
561 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
562 gic_data[gic_nr].saved_spi_active[i] =
563 readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
567 * Restores the GIC distributor registers during resume or when coming out of
568 * idle. Must be called before enabling interrupts. If a level interrupt
569 * that occured while the GIC was suspended is still present, it will be
570 * handled normally, but any edge interrupts that occured will not be seen by
571 * the GIC and need to be handled by the platform-specific wakeup source.
573 static void gic_dist_restore(unsigned int gic_nr)
575 unsigned int gic_irqs;
577 void __iomem *dist_base;
579 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
581 gic_irqs = gic_data[gic_nr].gic_irqs;
582 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
587 writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
589 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
590 writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
591 dist_base + GIC_DIST_CONFIG + i * 4);
593 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
594 writel_relaxed(GICD_INT_DEF_PRI_X4,
595 dist_base + GIC_DIST_PRI + i * 4);
597 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
598 writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
599 dist_base + GIC_DIST_TARGET + i * 4);
601 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
602 writel_relaxed(GICD_INT_EN_CLR_X32,
603 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
604 writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
605 dist_base + GIC_DIST_ENABLE_SET + i * 4);
608 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
609 writel_relaxed(GICD_INT_EN_CLR_X32,
610 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
611 writel_relaxed(gic_data[gic_nr].saved_spi_active[i],
612 dist_base + GIC_DIST_ACTIVE_SET + i * 4);
615 writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
618 static void gic_cpu_save(unsigned int gic_nr)
622 void __iomem *dist_base;
623 void __iomem *cpu_base;
625 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
627 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
628 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
630 if (!dist_base || !cpu_base)
633 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
634 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
635 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
637 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
638 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
639 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
641 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
642 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
643 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
647 static void gic_cpu_restore(unsigned int gic_nr)
651 void __iomem *dist_base;
652 void __iomem *cpu_base;
654 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
656 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
657 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
659 if (!dist_base || !cpu_base)
662 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
663 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
664 writel_relaxed(GICD_INT_EN_CLR_X32,
665 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
666 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
669 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
670 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
671 writel_relaxed(GICD_INT_EN_CLR_X32,
672 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
673 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
676 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
677 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
678 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
680 for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
681 writel_relaxed(GICD_INT_DEF_PRI_X4,
682 dist_base + GIC_DIST_PRI + i * 4);
684 writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
685 gic_cpu_if_up(&gic_data[gic_nr]);
688 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
692 for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
693 #ifdef CONFIG_GIC_NON_BANKED
694 /* Skip over unused GICs */
695 if (!gic_data[i].get_base)
702 case CPU_PM_ENTER_FAILED:
706 case CPU_CLUSTER_PM_ENTER:
709 case CPU_CLUSTER_PM_ENTER_FAILED:
710 case CPU_CLUSTER_PM_EXIT:
719 static struct notifier_block gic_notifier_block = {
720 .notifier_call = gic_notifier,
723 static void __init gic_pm_init(struct gic_chip_data *gic)
725 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
727 BUG_ON(!gic->saved_ppi_enable);
729 gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
731 BUG_ON(!gic->saved_ppi_active);
733 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
735 BUG_ON(!gic->saved_ppi_conf);
737 if (gic == &gic_data[0])
738 cpu_pm_register_notifier(&gic_notifier_block);
741 static void __init gic_pm_init(struct gic_chip_data *gic)
747 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
750 unsigned long flags, map = 0;
752 raw_spin_lock_irqsave(&irq_controller_lock, flags);
754 /* Convert our logical CPU mask into a physical one. */
755 for_each_cpu(cpu, mask)
756 map |= gic_cpu_map[cpu];
759 * Ensure that stores to Normal memory are visible to the
760 * other CPUs before they observe us issuing the IPI.
764 /* this always happens on GIC0 */
765 writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
767 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
771 #ifdef CONFIG_BL_SWITCHER
773 * gic_send_sgi - send a SGI directly to given CPU interface number
775 * cpu_id: the ID for the destination CPU interface
776 * irq: the IPI number to send a SGI for
778 void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
780 BUG_ON(cpu_id >= NR_GIC_CPU_IF);
781 cpu_id = 1 << cpu_id;
782 /* this always happens on GIC0 */
783 writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
787 * gic_get_cpu_id - get the CPU interface ID for the specified CPU
789 * @cpu: the logical CPU number to get the GIC ID for.
791 * Return the CPU interface ID for the given logical CPU number,
792 * or -1 if the CPU number is too large or the interface ID is
793 * unknown (more than one bit set).
795 int gic_get_cpu_id(unsigned int cpu)
797 unsigned int cpu_bit;
799 if (cpu >= NR_GIC_CPU_IF)
801 cpu_bit = gic_cpu_map[cpu];
802 if (cpu_bit & (cpu_bit - 1))
804 return __ffs(cpu_bit);
808 * gic_migrate_target - migrate IRQs to another CPU interface
810 * @new_cpu_id: the CPU target ID to migrate IRQs to
812 * Migrate all peripheral interrupts with a target matching the current CPU
813 * to the interface corresponding to @new_cpu_id. The CPU interface mapping
814 * is also updated. Targets to other CPU interfaces are unchanged.
815 * This must be called with IRQs locally disabled.
817 void gic_migrate_target(unsigned int new_cpu_id)
819 unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
820 void __iomem *dist_base;
821 int i, ror_val, cpu = smp_processor_id();
822 u32 val, cur_target_mask, active_mask;
824 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
826 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
829 gic_irqs = gic_data[gic_nr].gic_irqs;
831 cur_cpu_id = __ffs(gic_cpu_map[cpu]);
832 cur_target_mask = 0x01010101 << cur_cpu_id;
833 ror_val = (cur_cpu_id - new_cpu_id) & 31;
835 raw_spin_lock(&irq_controller_lock);
837 /* Update the target interface for this logical CPU */
838 gic_cpu_map[cpu] = 1 << new_cpu_id;
841 * Find all the peripheral interrupts targetting the current
842 * CPU interface and migrate them to the new CPU interface.
843 * We skip DIST_TARGET 0 to 7 as they are read-only.
845 for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
846 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
847 active_mask = val & cur_target_mask;
850 val |= ror32(active_mask, ror_val);
851 writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
855 raw_spin_unlock(&irq_controller_lock);
858 * Now let's migrate and clear any potential SGIs that might be
859 * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET
860 * is a banked register, we can only forward the SGI using
861 * GIC_DIST_SOFTINT. The original SGI source is lost but Linux
862 * doesn't use that information anyway.
864 * For the same reason we do not adjust SGI source information
865 * for previously sent SGIs by us to other CPUs either.
867 for (i = 0; i < 16; i += 4) {
869 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
872 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
873 for (j = i; j < i + 4; j++) {
875 writel_relaxed((1 << (new_cpu_id + 16)) | j,
876 dist_base + GIC_DIST_SOFTINT);
883 * gic_get_sgir_physaddr - get the physical address for the SGI register
885 * REturn the physical address of the SGI register to be used
886 * by some early assembly code when the kernel is not yet available.
888 static unsigned long gic_dist_physaddr;
890 unsigned long gic_get_sgir_physaddr(void)
892 if (!gic_dist_physaddr)
894 return gic_dist_physaddr + GIC_DIST_SOFTINT;
897 void __init gic_init_physaddr(struct device_node *node)
900 if (of_address_to_resource(node, 0, &res) == 0) {
901 gic_dist_physaddr = res.start;
902 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
907 #define gic_init_physaddr(node) do { } while (0)
910 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
913 struct gic_chip_data *gic = d->host_data;
916 irq_set_percpu_devid(irq);
917 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
918 handle_percpu_devid_irq, NULL, NULL);
919 irq_set_status_flags(irq, IRQ_NOAUTOEN);
921 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
922 handle_fasteoi_irq, NULL, NULL);
928 static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
932 static int gic_irq_domain_translate(struct irq_domain *d,
933 struct irq_fwspec *fwspec,
934 unsigned long *hwirq,
937 if (is_of_node(fwspec->fwnode)) {
938 if (fwspec->param_count < 3)
941 /* Get the interrupt number and add 16 to skip over SGIs */
942 *hwirq = fwspec->param[1] + 16;
945 * For SPIs, we need to add 16 more to get the GIC irq
948 if (!fwspec->param[0])
951 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
955 if (is_fwnode_irqchip(fwspec->fwnode)) {
956 if(fwspec->param_count != 2)
959 *hwirq = fwspec->param[0];
960 *type = fwspec->param[1];
968 static int gic_secondary_init(struct notifier_block *nfb, unsigned long action,
971 if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
972 gic_cpu_init(&gic_data[0]);
977 * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
978 * priority because the GIC needs to be up before the ARM generic timers.
980 static struct notifier_block gic_cpu_notifier = {
981 .notifier_call = gic_secondary_init,
986 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
987 unsigned int nr_irqs, void *arg)
990 irq_hw_number_t hwirq;
991 unsigned int type = IRQ_TYPE_NONE;
992 struct irq_fwspec *fwspec = arg;
994 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
998 for (i = 0; i < nr_irqs; i++)
999 gic_irq_domain_map(domain, virq + i, hwirq + i);
1004 static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
1005 .translate = gic_irq_domain_translate,
1006 .alloc = gic_irq_domain_alloc,
1007 .free = irq_domain_free_irqs_top,
1010 static const struct irq_domain_ops gic_irq_domain_ops = {
1011 .map = gic_irq_domain_map,
1012 .unmap = gic_irq_domain_unmap,
1015 static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
1016 void __iomem *dist_base, void __iomem *cpu_base,
1017 u32 percpu_offset, struct fwnode_handle *handle)
1019 irq_hw_number_t hwirq_base;
1020 struct gic_chip_data *gic;
1021 int gic_irqs, irq_base, i;
1023 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
1025 gic = &gic_data[gic_nr];
1027 /* Initialize irq_chip */
1028 if (static_key_true(&supports_deactivate) && gic_nr == 0) {
1029 gic->chip = gic_eoimode1_chip;
1031 gic->chip = gic_chip;
1032 gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d", gic_nr);
1037 gic->chip.irq_set_affinity = gic_set_affinity;
1040 #ifdef CONFIG_GIC_NON_BANKED
1041 if (percpu_offset) { /* Frankein-GIC without banked registers... */
1044 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
1045 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
1046 if (WARN_ON(!gic->dist_base.percpu_base ||
1047 !gic->cpu_base.percpu_base)) {
1048 free_percpu(gic->dist_base.percpu_base);
1049 free_percpu(gic->cpu_base.percpu_base);
1053 for_each_possible_cpu(cpu) {
1054 u32 mpidr = cpu_logical_map(cpu);
1055 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
1056 unsigned long offset = percpu_offset * core_id;
1057 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
1058 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
1061 gic_set_base_accessor(gic, gic_get_percpu_base);
1064 { /* Normal, sane GIC... */
1066 "GIC_NON_BANKED not enabled, ignoring %08x offset!",
1068 gic->dist_base.common_base = dist_base;
1069 gic->cpu_base.common_base = cpu_base;
1070 gic_set_base_accessor(gic, gic_get_common_base);
1074 * Find out how many interrupts are supported.
1075 * The GIC only supports up to 1020 interrupt sources.
1077 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
1078 gic_irqs = (gic_irqs + 1) * 32;
1079 if (gic_irqs > 1020)
1081 gic->gic_irqs = gic_irqs;
1083 if (handle) { /* DT/ACPI */
1084 gic->domain = irq_domain_create_linear(handle, gic_irqs,
1085 &gic_irq_domain_hierarchy_ops,
1087 } else { /* Legacy support */
1089 * For primary GICs, skip over SGIs.
1090 * For secondary GICs, skip over PPIs, too.
1092 if (gic_nr == 0 && (irq_start & 31) > 0) {
1094 if (irq_start != -1)
1095 irq_start = (irq_start & ~31) + 16;
1100 gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
1102 irq_base = irq_alloc_descs(irq_start, 16, gic_irqs,
1104 if (IS_ERR_VALUE(irq_base)) {
1105 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
1107 irq_base = irq_start;
1110 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
1111 hwirq_base, &gic_irq_domain_ops, gic);
1114 if (WARN_ON(!gic->domain))
1119 * Initialize the CPU interface map to all CPUs.
1120 * It will be refined as each CPU probes its ID.
1121 * This is only necessary for the primary GIC.
1123 for (i = 0; i < NR_GIC_CPU_IF; i++)
1124 gic_cpu_map[i] = 0xff;
1126 set_smp_cross_call(gic_raise_softirq);
1127 register_cpu_notifier(&gic_cpu_notifier);
1129 set_handle_irq(gic_handle_irq);
1130 if (static_key_true(&supports_deactivate))
1131 pr_info("GIC: Using split EOI/Deactivate mode\n");
1139 void __init gic_init(unsigned int gic_nr, int irq_start,
1140 void __iomem *dist_base, void __iomem *cpu_base)
1143 * Non-DT/ACPI systems won't run a hypervisor, so let's not
1144 * bother with these...
1146 static_key_slow_dec(&supports_deactivate);
1147 __gic_init_bases(gic_nr, irq_start, dist_base, cpu_base, 0, NULL);
1151 static int gic_cnt __initdata;
1153 static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
1155 struct resource cpuif_res;
1157 of_address_to_resource(node, 1, &cpuif_res);
1159 if (!is_hyp_mode_available())
1161 if (resource_size(&cpuif_res) < SZ_8K)
1163 if (resource_size(&cpuif_res) == SZ_128K) {
1164 u32 val_low, val_high;
1167 * Verify that we have the first 4kB of a GIC400
1168 * aliased over the first 64kB by checking the
1169 * GICC_IIDR register on both ends.
1171 val_low = readl_relaxed(*base + GIC_CPU_IDENT);
1172 val_high = readl_relaxed(*base + GIC_CPU_IDENT + 0xf000);
1173 if ((val_low & 0xffff0fff) != 0x0202043B ||
1174 val_low != val_high)
1178 * Move the base up by 60kB, so that we have a 8kB
1179 * contiguous region, which allows us to use GICC_DIR
1180 * at its normal offset. Please pass me that bucket.
1183 cpuif_res.start += 0xf000;
1184 pr_warn("GIC: Adjusting CPU interface base to %pa",
1192 gic_of_init(struct device_node *node, struct device_node *parent)
1194 void __iomem *cpu_base;
1195 void __iomem *dist_base;
1202 dist_base = of_iomap(node, 0);
1203 WARN(!dist_base, "unable to map gic dist registers\n");
1205 cpu_base = of_iomap(node, 1);
1206 WARN(!cpu_base, "unable to map gic cpu registers\n");
1209 * Disable split EOI/Deactivate if either HYP is not available
1210 * or the CPU interface is too small.
1212 if (gic_cnt == 0 && !gic_check_eoimode(node, &cpu_base))
1213 static_key_slow_dec(&supports_deactivate);
1215 if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
1218 __gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset,
1221 gic_init_physaddr(node);
1224 irq = irq_of_parse_and_map(node, 0);
1225 gic_cascade_irq(gic_cnt, irq);
1228 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1229 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
1234 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
1235 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
1236 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
1237 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
1238 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
1239 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
1240 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
1241 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
1242 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
1247 static phys_addr_t cpu_phy_base __initdata;
1250 gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
1251 const unsigned long end)
1253 struct acpi_madt_generic_interrupt *processor;
1254 phys_addr_t gic_cpu_base;
1255 static int cpu_base_assigned;
1257 processor = (struct acpi_madt_generic_interrupt *)header;
1259 if (BAD_MADT_GICC_ENTRY(processor, end))
1263 * There is no support for non-banked GICv1/2 register in ACPI spec.
1264 * All CPU interface addresses have to be the same.
1266 gic_cpu_base = processor->base_address;
1267 if (cpu_base_assigned && gic_cpu_base != cpu_phy_base)
1270 cpu_phy_base = gic_cpu_base;
1271 cpu_base_assigned = 1;
1275 /* The things you have to do to just *count* something... */
1276 static int __init acpi_dummy_func(struct acpi_subtable_header *header,
1277 const unsigned long end)
1282 static bool __init acpi_gic_redist_is_present(void)
1284 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1285 acpi_dummy_func, 0) > 0;
1288 static bool __init gic_validate_dist(struct acpi_subtable_header *header,
1289 struct acpi_probe_entry *ape)
1291 struct acpi_madt_generic_distributor *dist;
1292 dist = (struct acpi_madt_generic_distributor *)header;
1294 return (dist->version == ape->driver_data &&
1295 (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
1296 !acpi_gic_redist_is_present()));
1299 #define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
1300 #define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
1302 static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
1303 const unsigned long end)
1305 struct acpi_madt_generic_distributor *dist;
1306 void __iomem *cpu_base, *dist_base;
1307 struct fwnode_handle *domain_handle;
1310 /* Collect CPU base addresses */
1311 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1312 gic_acpi_parse_madt_cpu, 0);
1314 pr_err("No valid GICC entries exist\n");
1318 cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
1320 pr_err("Unable to map GICC registers\n");
1324 dist = (struct acpi_madt_generic_distributor *)header;
1325 dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE);
1327 pr_err("Unable to map GICD registers\n");
1333 * Disable split EOI/Deactivate if HYP is not available. ACPI
1334 * guarantees that we'll always have a GICv2, so the CPU
1335 * interface will always be the right size.
1337 if (!is_hyp_mode_available())
1338 static_key_slow_dec(&supports_deactivate);
1341 * Initialize GIC instance zero (no multi-GIC support).
1343 domain_handle = irq_domain_alloc_fwnode(dist_base);
1344 if (!domain_handle) {
1345 pr_err("Unable to allocate domain handle\n");
1351 __gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
1353 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1355 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1356 gicv2m_init(NULL, gic_data[0].domain);
1360 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1361 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
1363 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1364 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,