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(cpus_have_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);
348 * Ensure any shared data written by the CPU sending
349 * the IPI is read after we've read the ACK register
352 * Pairs with the write barrier in gic_raise_softirq
355 handle_IPI(irqnr, regs);
363 static void gic_handle_cascade_irq(struct irq_desc *desc)
365 struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc);
366 struct irq_chip *chip = irq_desc_get_chip(desc);
367 unsigned int cascade_irq, gic_irq;
368 unsigned long status;
370 chained_irq_enter(chip, desc);
372 raw_spin_lock(&irq_controller_lock);
373 status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
374 raw_spin_unlock(&irq_controller_lock);
376 gic_irq = (status & GICC_IAR_INT_ID_MASK);
377 if (gic_irq == GICC_INT_SPURIOUS)
380 cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
381 if (unlikely(gic_irq < 32 || gic_irq > 1020))
382 handle_bad_irq(desc);
384 generic_handle_irq(cascade_irq);
387 chained_irq_exit(chip, desc);
390 static struct irq_chip gic_chip = {
391 .irq_mask = gic_mask_irq,
392 .irq_unmask = gic_unmask_irq,
393 .irq_eoi = gic_eoi_irq,
394 .irq_set_type = gic_set_type,
395 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
396 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
397 .flags = IRQCHIP_SET_TYPE_MASKED |
398 IRQCHIP_SKIP_SET_WAKE |
399 IRQCHIP_MASK_ON_SUSPEND,
402 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
404 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
405 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq,
409 static u8 gic_get_cpumask(struct gic_chip_data *gic)
411 void __iomem *base = gic_data_dist_base(gic);
414 for (i = mask = 0; i < 32; i += 4) {
415 mask = readl_relaxed(base + GIC_DIST_TARGET + i);
422 if (!mask && num_possible_cpus() > 1)
423 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
428 static void gic_cpu_if_up(struct gic_chip_data *gic)
430 void __iomem *cpu_base = gic_data_cpu_base(gic);
434 if (gic == &gic_data[0] && static_key_true(&supports_deactivate))
435 mode = GIC_CPU_CTRL_EOImodeNS;
438 * Preserve bypass disable bits to be written back later
440 bypass = readl(cpu_base + GIC_CPU_CTRL);
441 bypass &= GICC_DIS_BYPASS_MASK;
443 writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL);
447 static void __init gic_dist_init(struct gic_chip_data *gic)
451 unsigned int gic_irqs = gic->gic_irqs;
452 void __iomem *base = gic_data_dist_base(gic);
454 writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL);
457 * Set all global interrupts to this CPU only.
459 cpumask = gic_get_cpumask(gic);
460 cpumask |= cpumask << 8;
461 cpumask |= cpumask << 16;
462 for (i = 32; i < gic_irqs; i += 4)
463 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
465 gic_dist_config(base, gic_irqs, NULL);
467 writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
470 static int gic_cpu_init(struct gic_chip_data *gic)
472 void __iomem *dist_base = gic_data_dist_base(gic);
473 void __iomem *base = gic_data_cpu_base(gic);
474 unsigned int cpu_mask, cpu = smp_processor_id();
478 * Setting up the CPU map is only relevant for the primary GIC
479 * because any nested/secondary GICs do not directly interface
482 if (gic == &gic_data[0]) {
484 * Get what the GIC says our CPU mask is.
486 if (WARN_ON(cpu >= NR_GIC_CPU_IF))
489 cpu_mask = gic_get_cpumask(gic);
490 gic_cpu_map[cpu] = cpu_mask;
493 * Clear our mask from the other map entries in case they're
496 for (i = 0; i < NR_GIC_CPU_IF; i++)
498 gic_cpu_map[i] &= ~cpu_mask;
501 gic_cpu_config(dist_base, NULL);
503 writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
509 int gic_cpu_if_down(unsigned int gic_nr)
511 void __iomem *cpu_base;
514 if (gic_nr >= CONFIG_ARM_GIC_MAX_NR)
517 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
518 val = readl(cpu_base + GIC_CPU_CTRL);
520 writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
527 * Saves the GIC distributor registers during suspend or idle. Must be called
528 * with interrupts disabled but before powering down the GIC. After calling
529 * this function, no interrupts will be delivered by the GIC, and another
530 * platform-specific wakeup source must be enabled.
532 static void gic_dist_save(unsigned int gic_nr)
534 unsigned int gic_irqs;
535 void __iomem *dist_base;
538 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
540 gic_irqs = gic_data[gic_nr].gic_irqs;
541 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
546 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
547 gic_data[gic_nr].saved_spi_conf[i] =
548 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
550 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
551 gic_data[gic_nr].saved_spi_target[i] =
552 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
554 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
555 gic_data[gic_nr].saved_spi_enable[i] =
556 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
558 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
559 gic_data[gic_nr].saved_spi_active[i] =
560 readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
564 * Restores the GIC distributor registers during resume or when coming out of
565 * idle. Must be called before enabling interrupts. If a level interrupt
566 * that occured while the GIC was suspended is still present, it will be
567 * handled normally, but any edge interrupts that occured will not be seen by
568 * the GIC and need to be handled by the platform-specific wakeup source.
570 static void gic_dist_restore(unsigned int gic_nr)
572 unsigned int gic_irqs;
574 void __iomem *dist_base;
576 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
578 gic_irqs = gic_data[gic_nr].gic_irqs;
579 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
584 writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
586 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
587 writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
588 dist_base + GIC_DIST_CONFIG + i * 4);
590 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
591 writel_relaxed(GICD_INT_DEF_PRI_X4,
592 dist_base + GIC_DIST_PRI + i * 4);
594 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
595 writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
596 dist_base + GIC_DIST_TARGET + i * 4);
598 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
599 writel_relaxed(GICD_INT_EN_CLR_X32,
600 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
601 writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
602 dist_base + GIC_DIST_ENABLE_SET + i * 4);
605 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
606 writel_relaxed(GICD_INT_EN_CLR_X32,
607 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
608 writel_relaxed(gic_data[gic_nr].saved_spi_active[i],
609 dist_base + GIC_DIST_ACTIVE_SET + i * 4);
612 writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
615 static void gic_cpu_save(unsigned int gic_nr)
619 void __iomem *dist_base;
620 void __iomem *cpu_base;
622 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
624 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
625 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
627 if (!dist_base || !cpu_base)
630 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
631 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
632 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
634 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
635 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
636 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
638 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
639 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
640 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
644 static void gic_cpu_restore(unsigned int gic_nr)
648 void __iomem *dist_base;
649 void __iomem *cpu_base;
651 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
653 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
654 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
656 if (!dist_base || !cpu_base)
659 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
660 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
661 writel_relaxed(GICD_INT_EN_CLR_X32,
662 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
663 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
666 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
667 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
668 writel_relaxed(GICD_INT_EN_CLR_X32,
669 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
670 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
673 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
674 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
675 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
677 for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
678 writel_relaxed(GICD_INT_DEF_PRI_X4,
679 dist_base + GIC_DIST_PRI + i * 4);
681 writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
682 gic_cpu_if_up(&gic_data[gic_nr]);
685 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
689 for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
690 #ifdef CONFIG_GIC_NON_BANKED
691 /* Skip over unused GICs */
692 if (!gic_data[i].get_base)
699 case CPU_PM_ENTER_FAILED:
703 case CPU_CLUSTER_PM_ENTER:
706 case CPU_CLUSTER_PM_ENTER_FAILED:
707 case CPU_CLUSTER_PM_EXIT:
716 static struct notifier_block gic_notifier_block = {
717 .notifier_call = gic_notifier,
720 static int __init gic_pm_init(struct gic_chip_data *gic)
722 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
724 if (WARN_ON(!gic->saved_ppi_enable))
727 gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
729 if (WARN_ON(!gic->saved_ppi_active))
730 goto free_ppi_enable;
732 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
734 if (WARN_ON(!gic->saved_ppi_conf))
735 goto free_ppi_active;
737 if (gic == &gic_data[0])
738 cpu_pm_register_notifier(&gic_notifier_block);
743 free_percpu(gic->saved_ppi_active);
745 free_percpu(gic->saved_ppi_enable);
750 static int __init gic_pm_init(struct gic_chip_data *gic)
757 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
760 unsigned long flags, map = 0;
762 raw_spin_lock_irqsave(&irq_controller_lock, flags);
764 /* Convert our logical CPU mask into a physical one. */
765 for_each_cpu(cpu, mask)
766 map |= gic_cpu_map[cpu];
769 * Ensure that stores to Normal memory are visible to the
770 * other CPUs before they observe us issuing the IPI.
774 /* this always happens on GIC0 */
775 writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
777 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
781 #ifdef CONFIG_BL_SWITCHER
783 * gic_send_sgi - send a SGI directly to given CPU interface number
785 * cpu_id: the ID for the destination CPU interface
786 * irq: the IPI number to send a SGI for
788 void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
790 BUG_ON(cpu_id >= NR_GIC_CPU_IF);
791 cpu_id = 1 << cpu_id;
792 /* this always happens on GIC0 */
793 writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
797 * gic_get_cpu_id - get the CPU interface ID for the specified CPU
799 * @cpu: the logical CPU number to get the GIC ID for.
801 * Return the CPU interface ID for the given logical CPU number,
802 * or -1 if the CPU number is too large or the interface ID is
803 * unknown (more than one bit set).
805 int gic_get_cpu_id(unsigned int cpu)
807 unsigned int cpu_bit;
809 if (cpu >= NR_GIC_CPU_IF)
811 cpu_bit = gic_cpu_map[cpu];
812 if (cpu_bit & (cpu_bit - 1))
814 return __ffs(cpu_bit);
818 * gic_migrate_target - migrate IRQs to another CPU interface
820 * @new_cpu_id: the CPU target ID to migrate IRQs to
822 * Migrate all peripheral interrupts with a target matching the current CPU
823 * to the interface corresponding to @new_cpu_id. The CPU interface mapping
824 * is also updated. Targets to other CPU interfaces are unchanged.
825 * This must be called with IRQs locally disabled.
827 void gic_migrate_target(unsigned int new_cpu_id)
829 unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
830 void __iomem *dist_base;
831 int i, ror_val, cpu = smp_processor_id();
832 u32 val, cur_target_mask, active_mask;
834 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
836 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
839 gic_irqs = gic_data[gic_nr].gic_irqs;
841 cur_cpu_id = __ffs(gic_cpu_map[cpu]);
842 cur_target_mask = 0x01010101 << cur_cpu_id;
843 ror_val = (cur_cpu_id - new_cpu_id) & 31;
845 raw_spin_lock(&irq_controller_lock);
847 /* Update the target interface for this logical CPU */
848 gic_cpu_map[cpu] = 1 << new_cpu_id;
851 * Find all the peripheral interrupts targetting the current
852 * CPU interface and migrate them to the new CPU interface.
853 * We skip DIST_TARGET 0 to 7 as they are read-only.
855 for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
856 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
857 active_mask = val & cur_target_mask;
860 val |= ror32(active_mask, ror_val);
861 writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
865 raw_spin_unlock(&irq_controller_lock);
868 * Now let's migrate and clear any potential SGIs that might be
869 * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET
870 * is a banked register, we can only forward the SGI using
871 * GIC_DIST_SOFTINT. The original SGI source is lost but Linux
872 * doesn't use that information anyway.
874 * For the same reason we do not adjust SGI source information
875 * for previously sent SGIs by us to other CPUs either.
877 for (i = 0; i < 16; i += 4) {
879 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
882 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
883 for (j = i; j < i + 4; j++) {
885 writel_relaxed((1 << (new_cpu_id + 16)) | j,
886 dist_base + GIC_DIST_SOFTINT);
893 * gic_get_sgir_physaddr - get the physical address for the SGI register
895 * REturn the physical address of the SGI register to be used
896 * by some early assembly code when the kernel is not yet available.
898 static unsigned long gic_dist_physaddr;
900 unsigned long gic_get_sgir_physaddr(void)
902 if (!gic_dist_physaddr)
904 return gic_dist_physaddr + GIC_DIST_SOFTINT;
907 void __init gic_init_physaddr(struct device_node *node)
910 if (of_address_to_resource(node, 0, &res) == 0) {
911 gic_dist_physaddr = res.start;
912 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
917 #define gic_init_physaddr(node) do { } while (0)
920 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
923 struct gic_chip_data *gic = d->host_data;
926 irq_set_percpu_devid(irq);
927 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
928 handle_percpu_devid_irq, NULL, NULL);
929 irq_set_status_flags(irq, IRQ_NOAUTOEN);
931 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
932 handle_fasteoi_irq, NULL, NULL);
938 static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
942 static int gic_irq_domain_translate(struct irq_domain *d,
943 struct irq_fwspec *fwspec,
944 unsigned long *hwirq,
947 if (is_of_node(fwspec->fwnode)) {
948 if (fwspec->param_count < 3)
951 /* Get the interrupt number and add 16 to skip over SGIs */
952 *hwirq = fwspec->param[1] + 16;
955 * For SPIs, we need to add 16 more to get the GIC irq
958 if (!fwspec->param[0])
961 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
965 if (is_fwnode_irqchip(fwspec->fwnode)) {
966 if(fwspec->param_count != 2)
969 *hwirq = fwspec->param[0];
970 *type = fwspec->param[1];
978 static int gic_secondary_init(struct notifier_block *nfb, unsigned long action,
981 if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
982 gic_cpu_init(&gic_data[0]);
987 * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
988 * priority because the GIC needs to be up before the ARM generic timers.
990 static struct notifier_block gic_cpu_notifier = {
991 .notifier_call = gic_secondary_init,
996 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
997 unsigned int nr_irqs, void *arg)
1000 irq_hw_number_t hwirq;
1001 unsigned int type = IRQ_TYPE_NONE;
1002 struct irq_fwspec *fwspec = arg;
1004 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
1008 for (i = 0; i < nr_irqs; i++)
1009 gic_irq_domain_map(domain, virq + i, hwirq + i);
1014 static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
1015 .translate = gic_irq_domain_translate,
1016 .alloc = gic_irq_domain_alloc,
1017 .free = irq_domain_free_irqs_top,
1020 static const struct irq_domain_ops gic_irq_domain_ops = {
1021 .map = gic_irq_domain_map,
1022 .unmap = gic_irq_domain_unmap,
1025 static int __init __gic_init_bases(unsigned int gic_nr, int irq_start,
1026 void __iomem *dist_base, void __iomem *cpu_base,
1027 u32 percpu_offset, struct fwnode_handle *handle)
1029 irq_hw_number_t hwirq_base;
1030 struct gic_chip_data *gic;
1031 int gic_irqs, irq_base, i, ret;
1033 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
1035 gic_check_cpu_features();
1037 gic = &gic_data[gic_nr];
1039 /* Initialize irq_chip */
1040 gic->chip = gic_chip;
1042 if (static_key_true(&supports_deactivate) && gic_nr == 0) {
1043 gic->chip.irq_mask = gic_eoimode1_mask_irq;
1044 gic->chip.irq_eoi = gic_eoimode1_eoi_irq;
1045 gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
1046 gic->chip.name = kasprintf(GFP_KERNEL, "GICv2");
1048 gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d", gic_nr);
1053 gic->chip.irq_set_affinity = gic_set_affinity;
1056 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && percpu_offset) {
1057 /* Frankein-GIC without banked registers... */
1060 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
1061 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
1062 if (WARN_ON(!gic->dist_base.percpu_base ||
1063 !gic->cpu_base.percpu_base)) {
1068 for_each_possible_cpu(cpu) {
1069 u32 mpidr = cpu_logical_map(cpu);
1070 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
1071 unsigned long offset = percpu_offset * core_id;
1072 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
1073 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
1076 gic_set_base_accessor(gic, gic_get_percpu_base);
1078 /* Normal, sane GIC... */
1080 "GIC_NON_BANKED not enabled, ignoring %08x offset!",
1082 gic->dist_base.common_base = dist_base;
1083 gic->cpu_base.common_base = cpu_base;
1084 gic_set_base_accessor(gic, gic_get_common_base);
1088 * Find out how many interrupts are supported.
1089 * The GIC only supports up to 1020 interrupt sources.
1091 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
1092 gic_irqs = (gic_irqs + 1) * 32;
1093 if (gic_irqs > 1020)
1095 gic->gic_irqs = gic_irqs;
1097 if (handle) { /* DT/ACPI */
1098 gic->domain = irq_domain_create_linear(handle, gic_irqs,
1099 &gic_irq_domain_hierarchy_ops,
1101 } else { /* Legacy support */
1103 * For primary GICs, skip over SGIs.
1104 * For secondary GICs, skip over PPIs, too.
1106 if (gic_nr == 0 && (irq_start & 31) > 0) {
1108 if (irq_start != -1)
1109 irq_start = (irq_start & ~31) + 16;
1114 gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
1116 irq_base = irq_alloc_descs(irq_start, 16, gic_irqs,
1118 if (IS_ERR_VALUE(irq_base)) {
1119 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
1121 irq_base = irq_start;
1124 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
1125 hwirq_base, &gic_irq_domain_ops, gic);
1128 if (WARN_ON(!gic->domain)) {
1135 * Initialize the CPU interface map to all CPUs.
1136 * It will be refined as each CPU probes its ID.
1137 * This is only necessary for the primary GIC.
1139 for (i = 0; i < NR_GIC_CPU_IF; i++)
1140 gic_cpu_map[i] = 0xff;
1142 set_smp_cross_call(gic_raise_softirq);
1143 register_cpu_notifier(&gic_cpu_notifier);
1145 set_handle_irq(gic_handle_irq);
1146 if (static_key_true(&supports_deactivate))
1147 pr_info("GIC: Using split EOI/Deactivate mode\n");
1151 ret = gic_cpu_init(gic);
1155 ret = gic_pm_init(gic);
1162 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && percpu_offset) {
1163 free_percpu(gic->dist_base.percpu_base);
1164 free_percpu(gic->cpu_base.percpu_base);
1167 kfree(gic->chip.name);
1172 void __init gic_init(unsigned int gic_nr, int irq_start,
1173 void __iomem *dist_base, void __iomem *cpu_base)
1176 * Non-DT/ACPI systems won't run a hypervisor, so let's not
1177 * bother with these...
1179 static_key_slow_dec(&supports_deactivate);
1180 __gic_init_bases(gic_nr, irq_start, dist_base, cpu_base, 0, NULL);
1184 static int gic_cnt __initdata;
1186 static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
1188 struct resource cpuif_res;
1190 of_address_to_resource(node, 1, &cpuif_res);
1192 if (!is_hyp_mode_available())
1194 if (resource_size(&cpuif_res) < SZ_8K)
1196 if (resource_size(&cpuif_res) == SZ_128K) {
1197 u32 val_low, val_high;
1200 * Verify that we have the first 4kB of a GIC400
1201 * aliased over the first 64kB by checking the
1202 * GICC_IIDR register on both ends.
1204 val_low = readl_relaxed(*base + GIC_CPU_IDENT);
1205 val_high = readl_relaxed(*base + GIC_CPU_IDENT + 0xf000);
1206 if ((val_low & 0xffff0fff) != 0x0202043B ||
1207 val_low != val_high)
1211 * Move the base up by 60kB, so that we have a 8kB
1212 * contiguous region, which allows us to use GICC_DIR
1213 * at its normal offset. Please pass me that bucket.
1216 cpuif_res.start += 0xf000;
1217 pr_warn("GIC: Adjusting CPU interface base to %pa",
1225 gic_of_init(struct device_node *node, struct device_node *parent)
1227 void __iomem *cpu_base;
1228 void __iomem *dist_base;
1235 dist_base = of_iomap(node, 0);
1236 if (WARN(!dist_base, "unable to map gic dist registers\n"))
1239 cpu_base = of_iomap(node, 1);
1240 if (WARN(!cpu_base, "unable to map gic cpu registers\n")) {
1246 * Disable split EOI/Deactivate if either HYP is not available
1247 * or the CPU interface is too small.
1249 if (gic_cnt == 0 && !gic_check_eoimode(node, &cpu_base))
1250 static_key_slow_dec(&supports_deactivate);
1252 if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
1255 ret = __gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset,
1264 gic_init_physaddr(node);
1267 irq = irq_of_parse_and_map(node, 0);
1268 gic_cascade_irq(gic_cnt, irq);
1271 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1272 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
1277 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
1278 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
1279 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
1280 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
1281 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
1282 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
1283 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
1284 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
1285 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
1290 static phys_addr_t cpu_phy_base __initdata;
1293 gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
1294 const unsigned long end)
1296 struct acpi_madt_generic_interrupt *processor;
1297 phys_addr_t gic_cpu_base;
1298 static int cpu_base_assigned;
1300 processor = (struct acpi_madt_generic_interrupt *)header;
1302 if (BAD_MADT_GICC_ENTRY(processor, end))
1306 * There is no support for non-banked GICv1/2 register in ACPI spec.
1307 * All CPU interface addresses have to be the same.
1309 gic_cpu_base = processor->base_address;
1310 if (cpu_base_assigned && gic_cpu_base != cpu_phy_base)
1313 cpu_phy_base = gic_cpu_base;
1314 cpu_base_assigned = 1;
1318 /* The things you have to do to just *count* something... */
1319 static int __init acpi_dummy_func(struct acpi_subtable_header *header,
1320 const unsigned long end)
1325 static bool __init acpi_gic_redist_is_present(void)
1327 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1328 acpi_dummy_func, 0) > 0;
1331 static bool __init gic_validate_dist(struct acpi_subtable_header *header,
1332 struct acpi_probe_entry *ape)
1334 struct acpi_madt_generic_distributor *dist;
1335 dist = (struct acpi_madt_generic_distributor *)header;
1337 return (dist->version == ape->driver_data &&
1338 (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
1339 !acpi_gic_redist_is_present()));
1342 #define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
1343 #define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
1345 static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
1346 const unsigned long end)
1348 struct acpi_madt_generic_distributor *dist;
1349 void __iomem *cpu_base, *dist_base;
1350 struct fwnode_handle *domain_handle;
1353 /* Collect CPU base addresses */
1354 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1355 gic_acpi_parse_madt_cpu, 0);
1357 pr_err("No valid GICC entries exist\n");
1361 cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
1363 pr_err("Unable to map GICC registers\n");
1367 dist = (struct acpi_madt_generic_distributor *)header;
1368 dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE);
1370 pr_err("Unable to map GICD registers\n");
1376 * Disable split EOI/Deactivate if HYP is not available. ACPI
1377 * guarantees that we'll always have a GICv2, so the CPU
1378 * interface will always be the right size.
1380 if (!is_hyp_mode_available())
1381 static_key_slow_dec(&supports_deactivate);
1384 * Initialize GIC instance zero (no multi-GIC support).
1386 domain_handle = irq_domain_alloc_fwnode(dist_base);
1387 if (!domain_handle) {
1388 pr_err("Unable to allocate domain handle\n");
1394 ret = __gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
1396 pr_err("Failed to initialise GIC\n");
1397 irq_domain_free_fwnode(domain_handle);
1403 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1405 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1406 gicv2m_init(NULL, gic_data[0].domain);
1410 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1411 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
1413 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1414 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,