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;
75 void __iomem *raw_dist_base;
76 void __iomem *raw_cpu_base;
79 u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
80 u32 saved_spi_active[DIV_ROUND_UP(1020, 32)];
81 u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
82 u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
83 u32 __percpu *saved_ppi_enable;
84 u32 __percpu *saved_ppi_active;
85 u32 __percpu *saved_ppi_conf;
87 struct irq_domain *domain;
88 unsigned int gic_irqs;
89 #ifdef CONFIG_GIC_NON_BANKED
90 void __iomem *(*get_base)(union gic_base *);
94 static DEFINE_RAW_SPINLOCK(irq_controller_lock);
97 * The GIC mapping of CPU interfaces does not necessarily match
98 * the logical CPU numbering. Let's use a mapping as returned
101 #define NR_GIC_CPU_IF 8
102 static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
104 static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
106 static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly;
108 #ifdef CONFIG_GIC_NON_BANKED
109 static void __iomem *gic_get_percpu_base(union gic_base *base)
111 return raw_cpu_read(*base->percpu_base);
114 static void __iomem *gic_get_common_base(union gic_base *base)
116 return base->common_base;
119 static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
121 return data->get_base(&data->dist_base);
124 static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
126 return data->get_base(&data->cpu_base);
129 static inline void gic_set_base_accessor(struct gic_chip_data *data,
130 void __iomem *(*f)(union gic_base *))
135 #define gic_data_dist_base(d) ((d)->dist_base.common_base)
136 #define gic_data_cpu_base(d) ((d)->cpu_base.common_base)
137 #define gic_set_base_accessor(d, f)
140 static inline void __iomem *gic_dist_base(struct irq_data *d)
142 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
143 return gic_data_dist_base(gic_data);
146 static inline void __iomem *gic_cpu_base(struct irq_data *d)
148 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
149 return gic_data_cpu_base(gic_data);
152 static inline unsigned int gic_irq(struct irq_data *d)
157 static inline bool cascading_gic_irq(struct irq_data *d)
159 void *data = irq_data_get_irq_handler_data(d);
162 * If handler_data is set, this is a cascading interrupt, and
163 * it cannot possibly be forwarded.
169 * Routines to acknowledge, disable and enable interrupts
171 static void gic_poke_irq(struct irq_data *d, u32 offset)
173 u32 mask = 1 << (gic_irq(d) % 32);
174 writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4);
177 static int gic_peek_irq(struct irq_data *d, u32 offset)
179 u32 mask = 1 << (gic_irq(d) % 32);
180 return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask);
183 static void gic_mask_irq(struct irq_data *d)
185 gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR);
188 static void gic_eoimode1_mask_irq(struct irq_data *d)
192 * When masking a forwarded interrupt, make sure it is
193 * deactivated as well.
195 * This ensures that an interrupt that is getting
196 * disabled/masked will not get "stuck", because there is
197 * noone to deactivate it (guest is being terminated).
199 if (irqd_is_forwarded_to_vcpu(d))
200 gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR);
203 static void gic_unmask_irq(struct irq_data *d)
205 gic_poke_irq(d, GIC_DIST_ENABLE_SET);
208 static void gic_eoi_irq(struct irq_data *d)
210 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
213 static void gic_eoimode1_eoi_irq(struct irq_data *d)
215 /* Do not deactivate an IRQ forwarded to a vcpu. */
216 if (irqd_is_forwarded_to_vcpu(d))
219 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
222 static int gic_irq_set_irqchip_state(struct irq_data *d,
223 enum irqchip_irq_state which, bool val)
228 case IRQCHIP_STATE_PENDING:
229 reg = val ? GIC_DIST_PENDING_SET : GIC_DIST_PENDING_CLEAR;
232 case IRQCHIP_STATE_ACTIVE:
233 reg = val ? GIC_DIST_ACTIVE_SET : GIC_DIST_ACTIVE_CLEAR;
236 case IRQCHIP_STATE_MASKED:
237 reg = val ? GIC_DIST_ENABLE_CLEAR : GIC_DIST_ENABLE_SET;
244 gic_poke_irq(d, reg);
248 static int gic_irq_get_irqchip_state(struct irq_data *d,
249 enum irqchip_irq_state which, bool *val)
252 case IRQCHIP_STATE_PENDING:
253 *val = gic_peek_irq(d, GIC_DIST_PENDING_SET);
256 case IRQCHIP_STATE_ACTIVE:
257 *val = gic_peek_irq(d, GIC_DIST_ACTIVE_SET);
260 case IRQCHIP_STATE_MASKED:
261 *val = !gic_peek_irq(d, GIC_DIST_ENABLE_SET);
271 static int gic_set_type(struct irq_data *d, unsigned int type)
273 void __iomem *base = gic_dist_base(d);
274 unsigned int gicirq = gic_irq(d);
276 /* Interrupt configuration for SGIs can't be changed */
280 /* SPIs have restrictions on the supported types */
281 if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
282 type != IRQ_TYPE_EDGE_RISING)
285 return gic_configure_irq(gicirq, type, base, NULL);
288 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
290 /* Only interrupts on the primary GIC can be forwarded to a vcpu. */
291 if (cascading_gic_irq(d))
295 irqd_set_forwarded_to_vcpu(d);
297 irqd_clr_forwarded_to_vcpu(d);
302 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
305 void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
306 unsigned int cpu, shift = (gic_irq(d) % 4) * 8;
311 cpu = cpumask_any_and(mask_val, cpu_online_mask);
313 cpu = cpumask_first(mask_val);
315 if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
318 raw_spin_lock_irqsave(&irq_controller_lock, flags);
319 mask = 0xff << shift;
320 bit = gic_cpu_map[cpu] << shift;
321 val = readl_relaxed(reg) & ~mask;
322 writel_relaxed(val | bit, reg);
323 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
325 return IRQ_SET_MASK_OK_DONE;
329 static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
332 struct gic_chip_data *gic = &gic_data[0];
333 void __iomem *cpu_base = gic_data_cpu_base(gic);
336 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
337 irqnr = irqstat & GICC_IAR_INT_ID_MASK;
339 if (likely(irqnr > 15 && irqnr < 1020)) {
340 if (static_key_true(&supports_deactivate))
341 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
342 handle_domain_irq(gic->domain, irqnr, regs);
346 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
347 if (static_key_true(&supports_deactivate))
348 writel_relaxed(irqstat, cpu_base + GIC_CPU_DEACTIVATE);
351 * Ensure any shared data written by the CPU sending
352 * the IPI is read after we've read the ACK register
355 * Pairs with the write barrier in gic_raise_softirq
358 handle_IPI(irqnr, regs);
366 static void gic_handle_cascade_irq(struct irq_desc *desc)
368 struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc);
369 struct irq_chip *chip = irq_desc_get_chip(desc);
370 unsigned int cascade_irq, gic_irq;
371 unsigned long status;
373 chained_irq_enter(chip, desc);
375 raw_spin_lock(&irq_controller_lock);
376 status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
377 raw_spin_unlock(&irq_controller_lock);
379 gic_irq = (status & GICC_IAR_INT_ID_MASK);
380 if (gic_irq == GICC_INT_SPURIOUS)
383 cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
384 if (unlikely(gic_irq < 32 || gic_irq > 1020))
385 handle_bad_irq(desc);
387 generic_handle_irq(cascade_irq);
390 chained_irq_exit(chip, desc);
393 static struct irq_chip gic_chip = {
394 .irq_mask = gic_mask_irq,
395 .irq_unmask = gic_unmask_irq,
396 .irq_eoi = gic_eoi_irq,
397 .irq_set_type = gic_set_type,
398 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
399 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
400 .flags = IRQCHIP_SET_TYPE_MASKED |
401 IRQCHIP_SKIP_SET_WAKE |
402 IRQCHIP_MASK_ON_SUSPEND,
405 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
407 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
408 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq,
412 static u8 gic_get_cpumask(struct gic_chip_data *gic)
414 void __iomem *base = gic_data_dist_base(gic);
417 for (i = mask = 0; i < 32; i += 4) {
418 mask = readl_relaxed(base + GIC_DIST_TARGET + i);
425 if (!mask && num_possible_cpus() > 1)
426 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
431 static void gic_cpu_if_up(struct gic_chip_data *gic)
433 void __iomem *cpu_base = gic_data_cpu_base(gic);
437 if (gic == &gic_data[0] && static_key_true(&supports_deactivate))
438 mode = GIC_CPU_CTRL_EOImodeNS;
441 * Preserve bypass disable bits to be written back later
443 bypass = readl(cpu_base + GIC_CPU_CTRL);
444 bypass &= GICC_DIS_BYPASS_MASK;
446 writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL);
450 static void __init gic_dist_init(struct gic_chip_data *gic)
454 unsigned int gic_irqs = gic->gic_irqs;
455 void __iomem *base = gic_data_dist_base(gic);
457 writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL);
460 * Set all global interrupts to this CPU only.
462 cpumask = gic_get_cpumask(gic);
463 cpumask |= cpumask << 8;
464 cpumask |= cpumask << 16;
465 for (i = 32; i < gic_irqs; i += 4)
466 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
468 gic_dist_config(base, gic_irqs, NULL);
470 writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
473 static int gic_cpu_init(struct gic_chip_data *gic)
475 void __iomem *dist_base = gic_data_dist_base(gic);
476 void __iomem *base = gic_data_cpu_base(gic);
477 unsigned int cpu_mask, cpu = smp_processor_id();
481 * Setting up the CPU map is only relevant for the primary GIC
482 * because any nested/secondary GICs do not directly interface
485 if (gic == &gic_data[0]) {
487 * Get what the GIC says our CPU mask is.
489 if (WARN_ON(cpu >= NR_GIC_CPU_IF))
492 gic_check_cpu_features();
493 cpu_mask = gic_get_cpumask(gic);
494 gic_cpu_map[cpu] = cpu_mask;
497 * Clear our mask from the other map entries in case they're
500 for (i = 0; i < NR_GIC_CPU_IF; i++)
502 gic_cpu_map[i] &= ~cpu_mask;
505 gic_cpu_config(dist_base, NULL);
507 writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
513 int gic_cpu_if_down(unsigned int gic_nr)
515 void __iomem *cpu_base;
518 if (gic_nr >= CONFIG_ARM_GIC_MAX_NR)
521 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
522 val = readl(cpu_base + GIC_CPU_CTRL);
524 writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
531 * Saves the GIC distributor registers during suspend or idle. Must be called
532 * with interrupts disabled but before powering down the GIC. After calling
533 * this function, no interrupts will be delivered by the GIC, and another
534 * platform-specific wakeup source must be enabled.
536 static void gic_dist_save(struct gic_chip_data *gic)
538 unsigned int gic_irqs;
539 void __iomem *dist_base;
545 gic_irqs = gic->gic_irqs;
546 dist_base = gic_data_dist_base(gic);
551 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
552 gic->saved_spi_conf[i] =
553 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
555 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
556 gic->saved_spi_target[i] =
557 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
559 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
560 gic->saved_spi_enable[i] =
561 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
563 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
564 gic->saved_spi_active[i] =
565 readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
569 * Restores the GIC distributor registers during resume or when coming out of
570 * idle. Must be called before enabling interrupts. If a level interrupt
571 * that occured while the GIC was suspended is still present, it will be
572 * handled normally, but any edge interrupts that occured will not be seen by
573 * the GIC and need to be handled by the platform-specific wakeup source.
575 static void gic_dist_restore(struct gic_chip_data *gic)
577 unsigned int gic_irqs;
579 void __iomem *dist_base;
584 gic_irqs = gic->gic_irqs;
585 dist_base = gic_data_dist_base(gic);
590 writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
592 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
593 writel_relaxed(gic->saved_spi_conf[i],
594 dist_base + GIC_DIST_CONFIG + i * 4);
596 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
597 writel_relaxed(GICD_INT_DEF_PRI_X4,
598 dist_base + GIC_DIST_PRI + i * 4);
600 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
601 writel_relaxed(gic->saved_spi_target[i],
602 dist_base + GIC_DIST_TARGET + i * 4);
604 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
605 writel_relaxed(GICD_INT_EN_CLR_X32,
606 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
607 writel_relaxed(gic->saved_spi_enable[i],
608 dist_base + GIC_DIST_ENABLE_SET + i * 4);
611 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
612 writel_relaxed(GICD_INT_EN_CLR_X32,
613 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
614 writel_relaxed(gic->saved_spi_active[i],
615 dist_base + GIC_DIST_ACTIVE_SET + i * 4);
618 writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
621 static void gic_cpu_save(struct gic_chip_data *gic)
625 void __iomem *dist_base;
626 void __iomem *cpu_base;
631 dist_base = gic_data_dist_base(gic);
632 cpu_base = gic_data_cpu_base(gic);
634 if (!dist_base || !cpu_base)
637 ptr = raw_cpu_ptr(gic->saved_ppi_enable);
638 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
639 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
641 ptr = raw_cpu_ptr(gic->saved_ppi_active);
642 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
643 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
645 ptr = raw_cpu_ptr(gic->saved_ppi_conf);
646 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
647 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
651 static void gic_cpu_restore(struct gic_chip_data *gic)
655 void __iomem *dist_base;
656 void __iomem *cpu_base;
661 dist_base = gic_data_dist_base(gic);
662 cpu_base = gic_data_cpu_base(gic);
664 if (!dist_base || !cpu_base)
667 ptr = raw_cpu_ptr(gic->saved_ppi_enable);
668 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
669 writel_relaxed(GICD_INT_EN_CLR_X32,
670 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
671 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
674 ptr = raw_cpu_ptr(gic->saved_ppi_active);
675 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
676 writel_relaxed(GICD_INT_EN_CLR_X32,
677 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
678 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
681 ptr = raw_cpu_ptr(gic->saved_ppi_conf);
682 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
683 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
685 for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
686 writel_relaxed(GICD_INT_DEF_PRI_X4,
687 dist_base + GIC_DIST_PRI + i * 4);
689 writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
693 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
697 for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
698 #ifdef CONFIG_GIC_NON_BANKED
699 /* Skip over unused GICs */
700 if (!gic_data[i].get_base)
705 gic_cpu_save(&gic_data[i]);
707 case CPU_PM_ENTER_FAILED:
709 gic_cpu_restore(&gic_data[i]);
711 case CPU_CLUSTER_PM_ENTER:
712 gic_dist_save(&gic_data[i]);
714 case CPU_CLUSTER_PM_ENTER_FAILED:
715 case CPU_CLUSTER_PM_EXIT:
716 gic_dist_restore(&gic_data[i]);
724 static struct notifier_block gic_notifier_block = {
725 .notifier_call = gic_notifier,
728 static int __init gic_pm_init(struct gic_chip_data *gic)
730 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
732 if (WARN_ON(!gic->saved_ppi_enable))
735 gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
737 if (WARN_ON(!gic->saved_ppi_active))
738 goto free_ppi_enable;
740 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
742 if (WARN_ON(!gic->saved_ppi_conf))
743 goto free_ppi_active;
745 if (gic == &gic_data[0])
746 cpu_pm_register_notifier(&gic_notifier_block);
751 free_percpu(gic->saved_ppi_active);
753 free_percpu(gic->saved_ppi_enable);
758 static int __init gic_pm_init(struct gic_chip_data *gic)
765 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
768 unsigned long flags, map = 0;
770 raw_spin_lock_irqsave(&irq_controller_lock, flags);
772 /* Convert our logical CPU mask into a physical one. */
773 for_each_cpu(cpu, mask)
774 map |= gic_cpu_map[cpu];
777 * Ensure that stores to Normal memory are visible to the
778 * other CPUs before they observe us issuing the IPI.
782 /* this always happens on GIC0 */
783 writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
785 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
789 #ifdef CONFIG_BL_SWITCHER
791 * gic_send_sgi - send a SGI directly to given CPU interface number
793 * cpu_id: the ID for the destination CPU interface
794 * irq: the IPI number to send a SGI for
796 void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
798 BUG_ON(cpu_id >= NR_GIC_CPU_IF);
799 cpu_id = 1 << cpu_id;
800 /* this always happens on GIC0 */
801 writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
805 * gic_get_cpu_id - get the CPU interface ID for the specified CPU
807 * @cpu: the logical CPU number to get the GIC ID for.
809 * Return the CPU interface ID for the given logical CPU number,
810 * or -1 if the CPU number is too large or the interface ID is
811 * unknown (more than one bit set).
813 int gic_get_cpu_id(unsigned int cpu)
815 unsigned int cpu_bit;
817 if (cpu >= NR_GIC_CPU_IF)
819 cpu_bit = gic_cpu_map[cpu];
820 if (cpu_bit & (cpu_bit - 1))
822 return __ffs(cpu_bit);
826 * gic_migrate_target - migrate IRQs to another CPU interface
828 * @new_cpu_id: the CPU target ID to migrate IRQs to
830 * Migrate all peripheral interrupts with a target matching the current CPU
831 * to the interface corresponding to @new_cpu_id. The CPU interface mapping
832 * is also updated. Targets to other CPU interfaces are unchanged.
833 * This must be called with IRQs locally disabled.
835 void gic_migrate_target(unsigned int new_cpu_id)
837 unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
838 void __iomem *dist_base;
839 int i, ror_val, cpu = smp_processor_id();
840 u32 val, cur_target_mask, active_mask;
842 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
844 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
847 gic_irqs = gic_data[gic_nr].gic_irqs;
849 cur_cpu_id = __ffs(gic_cpu_map[cpu]);
850 cur_target_mask = 0x01010101 << cur_cpu_id;
851 ror_val = (cur_cpu_id - new_cpu_id) & 31;
853 raw_spin_lock(&irq_controller_lock);
855 /* Update the target interface for this logical CPU */
856 gic_cpu_map[cpu] = 1 << new_cpu_id;
859 * Find all the peripheral interrupts targetting the current
860 * CPU interface and migrate them to the new CPU interface.
861 * We skip DIST_TARGET 0 to 7 as they are read-only.
863 for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
864 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
865 active_mask = val & cur_target_mask;
868 val |= ror32(active_mask, ror_val);
869 writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
873 raw_spin_unlock(&irq_controller_lock);
876 * Now let's migrate and clear any potential SGIs that might be
877 * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET
878 * is a banked register, we can only forward the SGI using
879 * GIC_DIST_SOFTINT. The original SGI source is lost but Linux
880 * doesn't use that information anyway.
882 * For the same reason we do not adjust SGI source information
883 * for previously sent SGIs by us to other CPUs either.
885 for (i = 0; i < 16; i += 4) {
887 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
890 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
891 for (j = i; j < i + 4; j++) {
893 writel_relaxed((1 << (new_cpu_id + 16)) | j,
894 dist_base + GIC_DIST_SOFTINT);
901 * gic_get_sgir_physaddr - get the physical address for the SGI register
903 * REturn the physical address of the SGI register to be used
904 * by some early assembly code when the kernel is not yet available.
906 static unsigned long gic_dist_physaddr;
908 unsigned long gic_get_sgir_physaddr(void)
910 if (!gic_dist_physaddr)
912 return gic_dist_physaddr + GIC_DIST_SOFTINT;
915 void __init gic_init_physaddr(struct device_node *node)
918 if (of_address_to_resource(node, 0, &res) == 0) {
919 gic_dist_physaddr = res.start;
920 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
925 #define gic_init_physaddr(node) do { } while (0)
928 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
931 struct gic_chip_data *gic = d->host_data;
934 irq_set_percpu_devid(irq);
935 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
936 handle_percpu_devid_irq, NULL, NULL);
937 irq_set_status_flags(irq, IRQ_NOAUTOEN);
939 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
940 handle_fasteoi_irq, NULL, NULL);
946 static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
950 static int gic_irq_domain_translate(struct irq_domain *d,
951 struct irq_fwspec *fwspec,
952 unsigned long *hwirq,
955 if (is_of_node(fwspec->fwnode)) {
956 if (fwspec->param_count < 3)
959 /* Get the interrupt number and add 16 to skip over SGIs */
960 *hwirq = fwspec->param[1] + 16;
963 * For SPIs, we need to add 16 more to get the GIC irq
966 if (!fwspec->param[0])
969 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
973 if (is_fwnode_irqchip(fwspec->fwnode)) {
974 if(fwspec->param_count != 2)
977 *hwirq = fwspec->param[0];
978 *type = fwspec->param[1];
986 static int gic_secondary_init(struct notifier_block *nfb, unsigned long action,
989 if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
990 gic_cpu_init(&gic_data[0]);
995 * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
996 * priority because the GIC needs to be up before the ARM generic timers.
998 static struct notifier_block gic_cpu_notifier = {
999 .notifier_call = gic_secondary_init,
1004 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
1005 unsigned int nr_irqs, void *arg)
1008 irq_hw_number_t hwirq;
1009 unsigned int type = IRQ_TYPE_NONE;
1010 struct irq_fwspec *fwspec = arg;
1012 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
1016 for (i = 0; i < nr_irqs; i++)
1017 gic_irq_domain_map(domain, virq + i, hwirq + i);
1022 static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
1023 .translate = gic_irq_domain_translate,
1024 .alloc = gic_irq_domain_alloc,
1025 .free = irq_domain_free_irqs_top,
1028 static const struct irq_domain_ops gic_irq_domain_ops = {
1029 .map = gic_irq_domain_map,
1030 .unmap = gic_irq_domain_unmap,
1033 static int __init __gic_init_bases(struct gic_chip_data *gic, int irq_start,
1034 struct fwnode_handle *handle)
1036 irq_hw_number_t hwirq_base;
1037 int gic_irqs, irq_base, i, ret;
1039 if (WARN_ON(!gic || gic->domain))
1042 /* Initialize irq_chip */
1043 gic->chip = gic_chip;
1045 if (static_key_true(&supports_deactivate) && gic == &gic_data[0]) {
1046 gic->chip.irq_mask = gic_eoimode1_mask_irq;
1047 gic->chip.irq_eoi = gic_eoimode1_eoi_irq;
1048 gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
1049 gic->chip.name = kasprintf(GFP_KERNEL, "GICv2");
1051 gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d",
1052 (int)(gic - &gic_data[0]));
1056 if (gic == &gic_data[0])
1057 gic->chip.irq_set_affinity = gic_set_affinity;
1060 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
1061 /* Frankein-GIC without banked registers... */
1064 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
1065 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
1066 if (WARN_ON(!gic->dist_base.percpu_base ||
1067 !gic->cpu_base.percpu_base)) {
1072 for_each_possible_cpu(cpu) {
1073 u32 mpidr = cpu_logical_map(cpu);
1074 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
1075 unsigned long offset = gic->percpu_offset * core_id;
1076 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) =
1077 gic->raw_dist_base + offset;
1078 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) =
1079 gic->raw_cpu_base + offset;
1082 gic_set_base_accessor(gic, gic_get_percpu_base);
1084 /* Normal, sane GIC... */
1085 WARN(gic->percpu_offset,
1086 "GIC_NON_BANKED not enabled, ignoring %08x offset!",
1087 gic->percpu_offset);
1088 gic->dist_base.common_base = gic->raw_dist_base;
1089 gic->cpu_base.common_base = gic->raw_cpu_base;
1090 gic_set_base_accessor(gic, gic_get_common_base);
1094 * Find out how many interrupts are supported.
1095 * The GIC only supports up to 1020 interrupt sources.
1097 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
1098 gic_irqs = (gic_irqs + 1) * 32;
1099 if (gic_irqs > 1020)
1101 gic->gic_irqs = gic_irqs;
1103 if (handle) { /* DT/ACPI */
1104 gic->domain = irq_domain_create_linear(handle, gic_irqs,
1105 &gic_irq_domain_hierarchy_ops,
1107 } else { /* Legacy support */
1109 * For primary GICs, skip over SGIs.
1110 * For secondary GICs, skip over PPIs, too.
1112 if (gic == &gic_data[0] && (irq_start & 31) > 0) {
1114 if (irq_start != -1)
1115 irq_start = (irq_start & ~31) + 16;
1120 gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
1122 irq_base = irq_alloc_descs(irq_start, 16, gic_irqs,
1124 if (IS_ERR_VALUE(irq_base)) {
1125 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
1127 irq_base = irq_start;
1130 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
1131 hwirq_base, &gic_irq_domain_ops, gic);
1134 if (WARN_ON(!gic->domain)) {
1139 if (gic == &gic_data[0]) {
1141 * Initialize the CPU interface map to all CPUs.
1142 * It will be refined as each CPU probes its ID.
1143 * This is only necessary for the primary GIC.
1145 for (i = 0; i < NR_GIC_CPU_IF; i++)
1146 gic_cpu_map[i] = 0xff;
1148 set_smp_cross_call(gic_raise_softirq);
1149 register_cpu_notifier(&gic_cpu_notifier);
1151 set_handle_irq(gic_handle_irq);
1152 if (static_key_true(&supports_deactivate))
1153 pr_info("GIC: Using split EOI/Deactivate mode\n");
1157 ret = gic_cpu_init(gic);
1161 ret = gic_pm_init(gic);
1168 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
1169 free_percpu(gic->dist_base.percpu_base);
1170 free_percpu(gic->cpu_base.percpu_base);
1173 kfree(gic->chip.name);
1178 void __init gic_init(unsigned int gic_nr, int irq_start,
1179 void __iomem *dist_base, void __iomem *cpu_base)
1181 struct gic_chip_data *gic;
1183 if (WARN_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR))
1187 * Non-DT/ACPI systems won't run a hypervisor, so let's not
1188 * bother with these...
1190 static_key_slow_dec(&supports_deactivate);
1192 gic = &gic_data[gic_nr];
1193 gic->raw_dist_base = dist_base;
1194 gic->raw_cpu_base = cpu_base;
1196 __gic_init_bases(gic, irq_start, NULL);
1199 static void gic_teardown(struct gic_chip_data *gic)
1204 if (gic->raw_dist_base)
1205 iounmap(gic->raw_dist_base);
1206 if (gic->raw_cpu_base)
1207 iounmap(gic->raw_cpu_base);
1211 static int gic_cnt __initdata;
1213 static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
1215 struct resource cpuif_res;
1217 of_address_to_resource(node, 1, &cpuif_res);
1219 if (!is_hyp_mode_available())
1221 if (resource_size(&cpuif_res) < SZ_8K)
1223 if (resource_size(&cpuif_res) == SZ_128K) {
1224 u32 val_low, val_high;
1227 * Verify that we have the first 4kB of a GIC400
1228 * aliased over the first 64kB by checking the
1229 * GICC_IIDR register on both ends.
1231 val_low = readl_relaxed(*base + GIC_CPU_IDENT);
1232 val_high = readl_relaxed(*base + GIC_CPU_IDENT + 0xf000);
1233 if ((val_low & 0xffff0fff) != 0x0202043B ||
1234 val_low != val_high)
1238 * Move the base up by 60kB, so that we have a 8kB
1239 * contiguous region, which allows us to use GICC_DIR
1240 * at its normal offset. Please pass me that bucket.
1243 cpuif_res.start += 0xf000;
1244 pr_warn("GIC: Adjusting CPU interface base to %pa",
1251 static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node)
1256 gic->raw_dist_base = of_iomap(node, 0);
1257 if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n"))
1260 gic->raw_cpu_base = of_iomap(node, 1);
1261 if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n"))
1264 if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset))
1265 gic->percpu_offset = 0;
1276 gic_of_init(struct device_node *node, struct device_node *parent)
1278 struct gic_chip_data *gic;
1284 if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR))
1287 gic = &gic_data[gic_cnt];
1289 ret = gic_of_setup(gic, node);
1294 * Disable split EOI/Deactivate if either HYP is not available
1295 * or the CPU interface is too small.
1297 if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base))
1298 static_key_slow_dec(&supports_deactivate);
1300 ret = __gic_init_bases(gic, -1, &node->fwnode);
1307 gic_init_physaddr(node);
1310 irq = irq_of_parse_and_map(node, 0);
1311 gic_cascade_irq(gic_cnt, irq);
1314 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1315 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
1320 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
1321 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
1322 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
1323 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
1324 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
1325 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
1326 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
1327 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
1328 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
1333 static phys_addr_t cpu_phy_base __initdata;
1336 gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
1337 const unsigned long end)
1339 struct acpi_madt_generic_interrupt *processor;
1340 phys_addr_t gic_cpu_base;
1341 static int cpu_base_assigned;
1343 processor = (struct acpi_madt_generic_interrupt *)header;
1345 if (BAD_MADT_GICC_ENTRY(processor, end))
1349 * There is no support for non-banked GICv1/2 register in ACPI spec.
1350 * All CPU interface addresses have to be the same.
1352 gic_cpu_base = processor->base_address;
1353 if (cpu_base_assigned && gic_cpu_base != cpu_phy_base)
1356 cpu_phy_base = gic_cpu_base;
1357 cpu_base_assigned = 1;
1361 /* The things you have to do to just *count* something... */
1362 static int __init acpi_dummy_func(struct acpi_subtable_header *header,
1363 const unsigned long end)
1368 static bool __init acpi_gic_redist_is_present(void)
1370 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1371 acpi_dummy_func, 0) > 0;
1374 static bool __init gic_validate_dist(struct acpi_subtable_header *header,
1375 struct acpi_probe_entry *ape)
1377 struct acpi_madt_generic_distributor *dist;
1378 dist = (struct acpi_madt_generic_distributor *)header;
1380 return (dist->version == ape->driver_data &&
1381 (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
1382 !acpi_gic_redist_is_present()));
1385 #define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
1386 #define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
1388 static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
1389 const unsigned long end)
1391 struct acpi_madt_generic_distributor *dist;
1392 struct fwnode_handle *domain_handle;
1393 struct gic_chip_data *gic = &gic_data[0];
1396 /* Collect CPU base addresses */
1397 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1398 gic_acpi_parse_madt_cpu, 0);
1400 pr_err("No valid GICC entries exist\n");
1404 gic->raw_cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
1405 if (!gic->raw_cpu_base) {
1406 pr_err("Unable to map GICC registers\n");
1410 dist = (struct acpi_madt_generic_distributor *)header;
1411 gic->raw_dist_base = ioremap(dist->base_address,
1412 ACPI_GICV2_DIST_MEM_SIZE);
1413 if (!gic->raw_dist_base) {
1414 pr_err("Unable to map GICD registers\n");
1420 * Disable split EOI/Deactivate if HYP is not available. ACPI
1421 * guarantees that we'll always have a GICv2, so the CPU
1422 * interface will always be the right size.
1424 if (!is_hyp_mode_available())
1425 static_key_slow_dec(&supports_deactivate);
1428 * Initialize GIC instance zero (no multi-GIC support).
1430 domain_handle = irq_domain_alloc_fwnode(gic->raw_dist_base);
1431 if (!domain_handle) {
1432 pr_err("Unable to allocate domain handle\n");
1437 ret = __gic_init_bases(gic, -1, domain_handle);
1439 pr_err("Failed to initialise GIC\n");
1440 irq_domain_free_fwnode(domain_handle);
1445 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1447 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1448 gicv2m_init(NULL, gic_data[0].domain);
1452 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1453 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
1455 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1456 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,