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 void 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 BUG_ON(cpu >= NR_GIC_CPU_IF);
487 cpu_mask = gic_get_cpumask(gic);
488 gic_cpu_map[cpu] = cpu_mask;
491 * Clear our mask from the other map entries in case they're
494 for (i = 0; i < NR_GIC_CPU_IF; i++)
496 gic_cpu_map[i] &= ~cpu_mask;
499 gic_cpu_config(dist_base, NULL);
501 writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
505 int gic_cpu_if_down(unsigned int gic_nr)
507 void __iomem *cpu_base;
510 if (gic_nr >= CONFIG_ARM_GIC_MAX_NR)
513 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
514 val = readl(cpu_base + GIC_CPU_CTRL);
516 writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
523 * Saves the GIC distributor registers during suspend or idle. Must be called
524 * with interrupts disabled but before powering down the GIC. After calling
525 * this function, no interrupts will be delivered by the GIC, and another
526 * platform-specific wakeup source must be enabled.
528 static void gic_dist_save(unsigned int gic_nr)
530 unsigned int gic_irqs;
531 void __iomem *dist_base;
534 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
536 gic_irqs = gic_data[gic_nr].gic_irqs;
537 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
542 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
543 gic_data[gic_nr].saved_spi_conf[i] =
544 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
546 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
547 gic_data[gic_nr].saved_spi_target[i] =
548 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
550 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
551 gic_data[gic_nr].saved_spi_enable[i] =
552 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
554 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
555 gic_data[gic_nr].saved_spi_active[i] =
556 readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
560 * Restores the GIC distributor registers during resume or when coming out of
561 * idle. Must be called before enabling interrupts. If a level interrupt
562 * that occured while the GIC was suspended is still present, it will be
563 * handled normally, but any edge interrupts that occured will not be seen by
564 * the GIC and need to be handled by the platform-specific wakeup source.
566 static void gic_dist_restore(unsigned int gic_nr)
568 unsigned int gic_irqs;
570 void __iomem *dist_base;
572 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
574 gic_irqs = gic_data[gic_nr].gic_irqs;
575 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
580 writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
582 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
583 writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
584 dist_base + GIC_DIST_CONFIG + i * 4);
586 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
587 writel_relaxed(GICD_INT_DEF_PRI_X4,
588 dist_base + GIC_DIST_PRI + i * 4);
590 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
591 writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
592 dist_base + GIC_DIST_TARGET + i * 4);
594 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
595 writel_relaxed(GICD_INT_EN_CLR_X32,
596 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
597 writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
598 dist_base + GIC_DIST_ENABLE_SET + 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_ACTIVE_CLEAR + i * 4);
604 writel_relaxed(gic_data[gic_nr].saved_spi_active[i],
605 dist_base + GIC_DIST_ACTIVE_SET + i * 4);
608 writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
611 static void gic_cpu_save(unsigned int gic_nr)
615 void __iomem *dist_base;
616 void __iomem *cpu_base;
618 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
620 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
621 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
623 if (!dist_base || !cpu_base)
626 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
627 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
628 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
630 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
631 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
632 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
634 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
635 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
636 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
640 static void gic_cpu_restore(unsigned int gic_nr)
644 void __iomem *dist_base;
645 void __iomem *cpu_base;
647 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
649 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
650 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
652 if (!dist_base || !cpu_base)
655 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
656 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
657 writel_relaxed(GICD_INT_EN_CLR_X32,
658 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
659 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
662 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
663 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
664 writel_relaxed(GICD_INT_EN_CLR_X32,
665 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
666 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
669 ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
670 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
671 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
673 for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
674 writel_relaxed(GICD_INT_DEF_PRI_X4,
675 dist_base + GIC_DIST_PRI + i * 4);
677 writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
678 gic_cpu_if_up(&gic_data[gic_nr]);
681 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
685 for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
686 #ifdef CONFIG_GIC_NON_BANKED
687 /* Skip over unused GICs */
688 if (!gic_data[i].get_base)
695 case CPU_PM_ENTER_FAILED:
699 case CPU_CLUSTER_PM_ENTER:
702 case CPU_CLUSTER_PM_ENTER_FAILED:
703 case CPU_CLUSTER_PM_EXIT:
712 static struct notifier_block gic_notifier_block = {
713 .notifier_call = gic_notifier,
716 static void __init gic_pm_init(struct gic_chip_data *gic)
718 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
720 BUG_ON(!gic->saved_ppi_enable);
722 gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
724 BUG_ON(!gic->saved_ppi_active);
726 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
728 BUG_ON(!gic->saved_ppi_conf);
730 if (gic == &gic_data[0])
731 cpu_pm_register_notifier(&gic_notifier_block);
734 static void __init gic_pm_init(struct gic_chip_data *gic)
740 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
743 unsigned long flags, map = 0;
745 raw_spin_lock_irqsave(&irq_controller_lock, flags);
747 /* Convert our logical CPU mask into a physical one. */
748 for_each_cpu(cpu, mask)
749 map |= gic_cpu_map[cpu];
752 * Ensure that stores to Normal memory are visible to the
753 * other CPUs before they observe us issuing the IPI.
757 /* this always happens on GIC0 */
758 writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
760 raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
764 #ifdef CONFIG_BL_SWITCHER
766 * gic_send_sgi - send a SGI directly to given CPU interface number
768 * cpu_id: the ID for the destination CPU interface
769 * irq: the IPI number to send a SGI for
771 void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
773 BUG_ON(cpu_id >= NR_GIC_CPU_IF);
774 cpu_id = 1 << cpu_id;
775 /* this always happens on GIC0 */
776 writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
780 * gic_get_cpu_id - get the CPU interface ID for the specified CPU
782 * @cpu: the logical CPU number to get the GIC ID for.
784 * Return the CPU interface ID for the given logical CPU number,
785 * or -1 if the CPU number is too large or the interface ID is
786 * unknown (more than one bit set).
788 int gic_get_cpu_id(unsigned int cpu)
790 unsigned int cpu_bit;
792 if (cpu >= NR_GIC_CPU_IF)
794 cpu_bit = gic_cpu_map[cpu];
795 if (cpu_bit & (cpu_bit - 1))
797 return __ffs(cpu_bit);
801 * gic_migrate_target - migrate IRQs to another CPU interface
803 * @new_cpu_id: the CPU target ID to migrate IRQs to
805 * Migrate all peripheral interrupts with a target matching the current CPU
806 * to the interface corresponding to @new_cpu_id. The CPU interface mapping
807 * is also updated. Targets to other CPU interfaces are unchanged.
808 * This must be called with IRQs locally disabled.
810 void gic_migrate_target(unsigned int new_cpu_id)
812 unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
813 void __iomem *dist_base;
814 int i, ror_val, cpu = smp_processor_id();
815 u32 val, cur_target_mask, active_mask;
817 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
819 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
822 gic_irqs = gic_data[gic_nr].gic_irqs;
824 cur_cpu_id = __ffs(gic_cpu_map[cpu]);
825 cur_target_mask = 0x01010101 << cur_cpu_id;
826 ror_val = (cur_cpu_id - new_cpu_id) & 31;
828 raw_spin_lock(&irq_controller_lock);
830 /* Update the target interface for this logical CPU */
831 gic_cpu_map[cpu] = 1 << new_cpu_id;
834 * Find all the peripheral interrupts targetting the current
835 * CPU interface and migrate them to the new CPU interface.
836 * We skip DIST_TARGET 0 to 7 as they are read-only.
838 for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
839 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
840 active_mask = val & cur_target_mask;
843 val |= ror32(active_mask, ror_val);
844 writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
848 raw_spin_unlock(&irq_controller_lock);
851 * Now let's migrate and clear any potential SGIs that might be
852 * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET
853 * is a banked register, we can only forward the SGI using
854 * GIC_DIST_SOFTINT. The original SGI source is lost but Linux
855 * doesn't use that information anyway.
857 * For the same reason we do not adjust SGI source information
858 * for previously sent SGIs by us to other CPUs either.
860 for (i = 0; i < 16; i += 4) {
862 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
865 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
866 for (j = i; j < i + 4; j++) {
868 writel_relaxed((1 << (new_cpu_id + 16)) | j,
869 dist_base + GIC_DIST_SOFTINT);
876 * gic_get_sgir_physaddr - get the physical address for the SGI register
878 * REturn the physical address of the SGI register to be used
879 * by some early assembly code when the kernel is not yet available.
881 static unsigned long gic_dist_physaddr;
883 unsigned long gic_get_sgir_physaddr(void)
885 if (!gic_dist_physaddr)
887 return gic_dist_physaddr + GIC_DIST_SOFTINT;
890 void __init gic_init_physaddr(struct device_node *node)
893 if (of_address_to_resource(node, 0, &res) == 0) {
894 gic_dist_physaddr = res.start;
895 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
900 #define gic_init_physaddr(node) do { } while (0)
903 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
906 struct gic_chip_data *gic = d->host_data;
909 irq_set_percpu_devid(irq);
910 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
911 handle_percpu_devid_irq, NULL, NULL);
912 irq_set_status_flags(irq, IRQ_NOAUTOEN);
914 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
915 handle_fasteoi_irq, NULL, NULL);
921 static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
925 static int gic_irq_domain_translate(struct irq_domain *d,
926 struct irq_fwspec *fwspec,
927 unsigned long *hwirq,
930 if (is_of_node(fwspec->fwnode)) {
931 if (fwspec->param_count < 3)
934 /* Get the interrupt number and add 16 to skip over SGIs */
935 *hwirq = fwspec->param[1] + 16;
938 * For SPIs, we need to add 16 more to get the GIC irq
941 if (!fwspec->param[0])
944 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
948 if (is_fwnode_irqchip(fwspec->fwnode)) {
949 if(fwspec->param_count != 2)
952 *hwirq = fwspec->param[0];
953 *type = fwspec->param[1];
961 static int gic_secondary_init(struct notifier_block *nfb, unsigned long action,
964 if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
965 gic_cpu_init(&gic_data[0]);
970 * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
971 * priority because the GIC needs to be up before the ARM generic timers.
973 static struct notifier_block gic_cpu_notifier = {
974 .notifier_call = gic_secondary_init,
979 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
980 unsigned int nr_irqs, void *arg)
983 irq_hw_number_t hwirq;
984 unsigned int type = IRQ_TYPE_NONE;
985 struct irq_fwspec *fwspec = arg;
987 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
991 for (i = 0; i < nr_irqs; i++)
992 gic_irq_domain_map(domain, virq + i, hwirq + i);
997 static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
998 .translate = gic_irq_domain_translate,
999 .alloc = gic_irq_domain_alloc,
1000 .free = irq_domain_free_irqs_top,
1003 static const struct irq_domain_ops gic_irq_domain_ops = {
1004 .map = gic_irq_domain_map,
1005 .unmap = gic_irq_domain_unmap,
1008 static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
1009 void __iomem *dist_base, void __iomem *cpu_base,
1010 u32 percpu_offset, struct fwnode_handle *handle)
1012 irq_hw_number_t hwirq_base;
1013 struct gic_chip_data *gic;
1014 int gic_irqs, irq_base, i;
1016 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
1018 gic_check_cpu_features();
1020 gic = &gic_data[gic_nr];
1022 /* Initialize irq_chip */
1023 gic->chip = gic_chip;
1025 if (static_key_true(&supports_deactivate) && gic_nr == 0) {
1026 gic->chip.irq_mask = gic_eoimode1_mask_irq;
1027 gic->chip.irq_eoi = gic_eoimode1_eoi_irq;
1028 gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
1029 gic->chip.name = "GICv2";
1031 gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d", gic_nr);
1036 gic->chip.irq_set_affinity = gic_set_affinity;
1039 #ifdef CONFIG_GIC_NON_BANKED
1040 if (percpu_offset) { /* Frankein-GIC without banked registers... */
1043 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
1044 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
1045 if (WARN_ON(!gic->dist_base.percpu_base ||
1046 !gic->cpu_base.percpu_base)) {
1047 free_percpu(gic->dist_base.percpu_base);
1048 free_percpu(gic->cpu_base.percpu_base);
1052 for_each_possible_cpu(cpu) {
1053 u32 mpidr = cpu_logical_map(cpu);
1054 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
1055 unsigned long offset = percpu_offset * core_id;
1056 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
1057 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
1060 gic_set_base_accessor(gic, gic_get_percpu_base);
1063 { /* Normal, sane GIC... */
1065 "GIC_NON_BANKED not enabled, ignoring %08x offset!",
1067 gic->dist_base.common_base = dist_base;
1068 gic->cpu_base.common_base = cpu_base;
1069 gic_set_base_accessor(gic, gic_get_common_base);
1073 * Find out how many interrupts are supported.
1074 * The GIC only supports up to 1020 interrupt sources.
1076 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
1077 gic_irqs = (gic_irqs + 1) * 32;
1078 if (gic_irqs > 1020)
1080 gic->gic_irqs = gic_irqs;
1082 if (handle) { /* DT/ACPI */
1083 gic->domain = irq_domain_create_linear(handle, gic_irqs,
1084 &gic_irq_domain_hierarchy_ops,
1086 } else { /* Legacy support */
1088 * For primary GICs, skip over SGIs.
1089 * For secondary GICs, skip over PPIs, too.
1091 if (gic_nr == 0 && (irq_start & 31) > 0) {
1093 if (irq_start != -1)
1094 irq_start = (irq_start & ~31) + 16;
1099 gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
1101 irq_base = irq_alloc_descs(irq_start, 16, gic_irqs,
1103 if (IS_ERR_VALUE(irq_base)) {
1104 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
1106 irq_base = irq_start;
1109 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
1110 hwirq_base, &gic_irq_domain_ops, gic);
1113 if (WARN_ON(!gic->domain))
1118 * Initialize the CPU interface map to all CPUs.
1119 * It will be refined as each CPU probes its ID.
1120 * This is only necessary for the primary GIC.
1122 for (i = 0; i < NR_GIC_CPU_IF; i++)
1123 gic_cpu_map[i] = 0xff;
1125 set_smp_cross_call(gic_raise_softirq);
1126 register_cpu_notifier(&gic_cpu_notifier);
1128 set_handle_irq(gic_handle_irq);
1129 if (static_key_true(&supports_deactivate))
1130 pr_info("GIC: Using split EOI/Deactivate mode\n");
1138 void __init gic_init(unsigned int gic_nr, int irq_start,
1139 void __iomem *dist_base, void __iomem *cpu_base)
1142 * Non-DT/ACPI systems won't run a hypervisor, so let's not
1143 * bother with these...
1145 static_key_slow_dec(&supports_deactivate);
1146 __gic_init_bases(gic_nr, irq_start, dist_base, cpu_base, 0, NULL);
1150 static int gic_cnt __initdata;
1152 static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
1154 struct resource cpuif_res;
1156 of_address_to_resource(node, 1, &cpuif_res);
1158 if (!is_hyp_mode_available())
1160 if (resource_size(&cpuif_res) < SZ_8K)
1162 if (resource_size(&cpuif_res) == SZ_128K) {
1163 u32 val_low, val_high;
1166 * Verify that we have the first 4kB of a GIC400
1167 * aliased over the first 64kB by checking the
1168 * GICC_IIDR register on both ends.
1170 val_low = readl_relaxed(*base + GIC_CPU_IDENT);
1171 val_high = readl_relaxed(*base + GIC_CPU_IDENT + 0xf000);
1172 if ((val_low & 0xffff0fff) != 0x0202043B ||
1173 val_low != val_high)
1177 * Move the base up by 60kB, so that we have a 8kB
1178 * contiguous region, which allows us to use GICC_DIR
1179 * at its normal offset. Please pass me that bucket.
1182 cpuif_res.start += 0xf000;
1183 pr_warn("GIC: Adjusting CPU interface base to %pa",
1191 gic_of_init(struct device_node *node, struct device_node *parent)
1193 void __iomem *cpu_base;
1194 void __iomem *dist_base;
1201 dist_base = of_iomap(node, 0);
1202 if (WARN(!dist_base, "unable to map gic dist registers\n"))
1205 cpu_base = of_iomap(node, 1);
1206 if (WARN(!cpu_base, "unable to map gic cpu registers\n")) {
1212 * Disable split EOI/Deactivate if either HYP is not available
1213 * or the CPU interface is too small.
1215 if (gic_cnt == 0 && !gic_check_eoimode(node, &cpu_base))
1216 static_key_slow_dec(&supports_deactivate);
1218 if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
1221 __gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset,
1224 gic_init_physaddr(node);
1227 irq = irq_of_parse_and_map(node, 0);
1228 gic_cascade_irq(gic_cnt, irq);
1231 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1232 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
1237 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
1238 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
1239 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
1240 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
1241 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
1242 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
1243 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
1244 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
1245 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
1250 static phys_addr_t cpu_phy_base __initdata;
1253 gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header,
1254 const unsigned long end)
1256 struct acpi_madt_generic_interrupt *processor;
1257 phys_addr_t gic_cpu_base;
1258 static int cpu_base_assigned;
1260 processor = (struct acpi_madt_generic_interrupt *)header;
1262 if (BAD_MADT_GICC_ENTRY(processor, end))
1266 * There is no support for non-banked GICv1/2 register in ACPI spec.
1267 * All CPU interface addresses have to be the same.
1269 gic_cpu_base = processor->base_address;
1270 if (cpu_base_assigned && gic_cpu_base != cpu_phy_base)
1273 cpu_phy_base = gic_cpu_base;
1274 cpu_base_assigned = 1;
1278 /* The things you have to do to just *count* something... */
1279 static int __init acpi_dummy_func(struct acpi_subtable_header *header,
1280 const unsigned long end)
1285 static bool __init acpi_gic_redist_is_present(void)
1287 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1288 acpi_dummy_func, 0) > 0;
1291 static bool __init gic_validate_dist(struct acpi_subtable_header *header,
1292 struct acpi_probe_entry *ape)
1294 struct acpi_madt_generic_distributor *dist;
1295 dist = (struct acpi_madt_generic_distributor *)header;
1297 return (dist->version == ape->driver_data &&
1298 (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
1299 !acpi_gic_redist_is_present()));
1302 #define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K)
1303 #define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K)
1305 static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
1306 const unsigned long end)
1308 struct acpi_madt_generic_distributor *dist;
1309 void __iomem *cpu_base, *dist_base;
1310 struct fwnode_handle *domain_handle;
1313 /* Collect CPU base addresses */
1314 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1315 gic_acpi_parse_madt_cpu, 0);
1317 pr_err("No valid GICC entries exist\n");
1321 cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
1323 pr_err("Unable to map GICC registers\n");
1327 dist = (struct acpi_madt_generic_distributor *)header;
1328 dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE);
1330 pr_err("Unable to map GICD registers\n");
1336 * Disable split EOI/Deactivate if HYP is not available. ACPI
1337 * guarantees that we'll always have a GICv2, so the CPU
1338 * interface will always be the right size.
1340 if (!is_hyp_mode_available())
1341 static_key_slow_dec(&supports_deactivate);
1344 * Initialize GIC instance zero (no multi-GIC support).
1346 domain_handle = irq_domain_alloc_fwnode(dist_base);
1347 if (!domain_handle) {
1348 pr_err("Unable to allocate domain handle\n");
1354 __gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
1356 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1358 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1359 gicv2m_init(NULL, gic_data[0].domain);
1363 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1364 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
1366 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1367 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,