2 * linux/arch/arm/common/gic.c
4 * Copyright (C) 2002 ARM Limited, All Rights Reserved.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Interrupt architecture for the GIC:
12 * o There is one Interrupt Distributor, which receives interrupts
13 * from system devices and sends them to the Interrupt Controllers.
15 * o There is one CPU Interface per CPU, which sends interrupts sent
16 * by the Distributor, and interrupts generated locally, to the
17 * associated CPU. The base address of the CPU interface is usually
18 * aliased so that the same address points to different chips depending
19 * on the CPU it is accessed from.
21 * Note that IRQs 0-31 are special - they are local to each CPU.
22 * As such, the enable set/clear, pending set/clear and active bit
23 * registers are banked per-cpu for these sources.
25 #include <linux/init.h>
26 #include <linux/kernel.h>
27 #include <linux/err.h>
28 #include <linux/module.h>
29 #include <linux/list.h>
30 #include <linux/smp.h>
31 #include <linux/cpu.h>
32 #include <linux/cpu_pm.h>
33 #include <linux/cpumask.h>
36 #include <linux/of_address.h>
37 #include <linux/of_irq.h>
38 #include <linux/irqdomain.h>
39 #include <linux/interrupt.h>
40 #include <linux/percpu.h>
41 #include <linux/slab.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>
53 void __iomem *common_base;
54 void __percpu __iomem **percpu_base;
57 struct gic_chip_data {
58 union gic_base dist_base;
59 union gic_base cpu_base;
61 u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
62 u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
63 u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
64 u32 __percpu *saved_ppi_enable;
65 u32 __percpu *saved_ppi_conf;
67 struct irq_domain *domain;
68 unsigned int gic_irqs;
69 #ifdef CONFIG_GIC_NON_BANKED
70 void __iomem *(*get_base)(union gic_base *);
74 static DEFINE_RAW_SPINLOCK(irq_controller_lock);
77 * The GIC mapping of CPU interfaces does not necessarily match
78 * the logical CPU numbering. Let's use a mapping as returned
81 #define NR_GIC_CPU_IF 8
82 static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
85 * Supported arch specific GIC irq extension.
86 * Default make them NULL.
88 struct irq_chip gic_arch_extn = {
92 .irq_retrigger = NULL,
101 static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly;
103 #ifdef CONFIG_GIC_NON_BANKED
104 static void __iomem *gic_get_percpu_base(union gic_base *base)
106 return *__this_cpu_ptr(base->percpu_base);
109 static void __iomem *gic_get_common_base(union gic_base *base)
111 return base->common_base;
114 static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
116 return data->get_base(&data->dist_base);
119 static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
121 return data->get_base(&data->cpu_base);
124 static inline void gic_set_base_accessor(struct gic_chip_data *data,
125 void __iomem *(*f)(union gic_base *))
130 #define gic_data_dist_base(d) ((d)->dist_base.common_base)
131 #define gic_data_cpu_base(d) ((d)->cpu_base.common_base)
132 #define gic_set_base_accessor(d, f)
135 static inline void __iomem *gic_dist_base(struct irq_data *d)
137 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
138 return gic_data_dist_base(gic_data);
141 static inline void __iomem *gic_cpu_base(struct irq_data *d)
143 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
144 return gic_data_cpu_base(gic_data);
147 static inline unsigned int gic_irq(struct irq_data *d)
153 * Routines to acknowledge, disable and enable interrupts
155 static void gic_mask_irq(struct irq_data *d)
157 u32 mask = 1 << (gic_irq(d) % 32);
159 raw_spin_lock(&irq_controller_lock);
160 writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_CLEAR + (gic_irq(d) / 32) * 4);
161 if (gic_arch_extn.irq_mask)
162 gic_arch_extn.irq_mask(d);
163 raw_spin_unlock(&irq_controller_lock);
166 static void gic_unmask_irq(struct irq_data *d)
168 u32 mask = 1 << (gic_irq(d) % 32);
170 raw_spin_lock(&irq_controller_lock);
171 if (gic_arch_extn.irq_unmask)
172 gic_arch_extn.irq_unmask(d);
173 writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_SET + (gic_irq(d) / 32) * 4);
174 raw_spin_unlock(&irq_controller_lock);
177 static void gic_eoi_irq(struct irq_data *d)
179 if (gic_arch_extn.irq_eoi) {
180 raw_spin_lock(&irq_controller_lock);
181 gic_arch_extn.irq_eoi(d);
182 raw_spin_unlock(&irq_controller_lock);
185 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
188 static int gic_set_type(struct irq_data *d, unsigned int type)
190 void __iomem *base = gic_dist_base(d);
191 unsigned int gicirq = gic_irq(d);
192 u32 enablemask = 1 << (gicirq % 32);
193 u32 enableoff = (gicirq / 32) * 4;
194 u32 confmask = 0x2 << ((gicirq % 16) * 2);
195 u32 confoff = (gicirq / 16) * 4;
196 bool enabled = false;
199 /* Interrupt configuration for SGIs can't be changed */
203 if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
206 raw_spin_lock(&irq_controller_lock);
208 if (gic_arch_extn.irq_set_type)
209 gic_arch_extn.irq_set_type(d, type);
211 val = readl_relaxed(base + GIC_DIST_CONFIG + confoff);
212 if (type == IRQ_TYPE_LEVEL_HIGH)
214 else if (type == IRQ_TYPE_EDGE_RISING)
218 * As recommended by the spec, disable the interrupt before changing
221 if (readl_relaxed(base + GIC_DIST_ENABLE_SET + enableoff) & enablemask) {
222 writel_relaxed(enablemask, base + GIC_DIST_ENABLE_CLEAR + enableoff);
226 writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
229 writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff);
231 raw_spin_unlock(&irq_controller_lock);
236 static int gic_retrigger(struct irq_data *d)
238 if (gic_arch_extn.irq_retrigger)
239 return gic_arch_extn.irq_retrigger(d);
241 /* the genirq layer expects 0 if we can't retrigger in hardware */
246 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
249 void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
250 unsigned int cpu, shift = (gic_irq(d) % 4) * 8;
254 cpu = cpumask_any_and(mask_val, cpu_online_mask);
256 cpu = cpumask_first(mask_val);
258 if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
261 mask = 0xff << shift;
262 bit = gic_cpu_map[cpu] << shift;
264 raw_spin_lock(&irq_controller_lock);
265 val = readl_relaxed(reg) & ~mask;
266 writel_relaxed(val | bit, reg);
267 raw_spin_unlock(&irq_controller_lock);
269 return IRQ_SET_MASK_OK;
274 static int gic_set_wake(struct irq_data *d, unsigned int on)
278 if (gic_arch_extn.irq_set_wake)
279 ret = gic_arch_extn.irq_set_wake(d, on);
285 #define gic_set_wake NULL
288 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
291 struct gic_chip_data *gic = &gic_data[0];
292 void __iomem *cpu_base = gic_data_cpu_base(gic);
295 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
296 irqnr = irqstat & ~0x1c00;
298 if (likely(irqnr > 15 && irqnr < 1021)) {
299 irqnr = irq_find_mapping(gic->domain, irqnr);
300 handle_IRQ(irqnr, regs);
304 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
306 handle_IPI(irqnr, regs);
314 static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
316 struct gic_chip_data *chip_data = irq_get_handler_data(irq);
317 struct irq_chip *chip = irq_get_chip(irq);
318 unsigned int cascade_irq, gic_irq;
319 unsigned long status;
321 chained_irq_enter(chip, desc);
323 raw_spin_lock(&irq_controller_lock);
324 status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
325 raw_spin_unlock(&irq_controller_lock);
327 gic_irq = (status & 0x3ff);
331 cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
332 if (unlikely(gic_irq < 32 || gic_irq > 1020))
333 handle_bad_irq(cascade_irq, desc);
335 generic_handle_irq(cascade_irq);
338 chained_irq_exit(chip, desc);
341 static struct irq_chip gic_chip = {
343 .irq_mask = gic_mask_irq,
344 .irq_unmask = gic_unmask_irq,
345 .irq_eoi = gic_eoi_irq,
346 .irq_set_type = gic_set_type,
347 .irq_retrigger = gic_retrigger,
349 .irq_set_affinity = gic_set_affinity,
351 .irq_set_wake = gic_set_wake,
354 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
356 if (gic_nr >= MAX_GIC_NR)
358 if (irq_set_handler_data(irq, &gic_data[gic_nr]) != 0)
360 irq_set_chained_handler(irq, gic_handle_cascade_irq);
363 static u8 gic_get_cpumask(struct gic_chip_data *gic)
365 void __iomem *base = gic_data_dist_base(gic);
368 for (i = mask = 0; i < 32; i += 4) {
369 mask = readl_relaxed(base + GIC_DIST_TARGET + i);
377 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
382 static void __init gic_dist_init(struct gic_chip_data *gic)
386 unsigned int gic_irqs = gic->gic_irqs;
387 void __iomem *base = gic_data_dist_base(gic);
389 writel_relaxed(0, base + GIC_DIST_CTRL);
392 * Set all global interrupts to be level triggered, active low.
394 for (i = 32; i < gic_irqs; i += 16)
395 writel_relaxed(0, base + GIC_DIST_CONFIG + i * 4 / 16);
398 * Set all global interrupts to this CPU only.
400 cpumask = gic_get_cpumask(gic);
401 cpumask |= cpumask << 8;
402 cpumask |= cpumask << 16;
403 for (i = 32; i < gic_irqs; i += 4)
404 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
407 * Set priority on all global interrupts.
409 for (i = 32; i < gic_irqs; i += 4)
410 writel_relaxed(0xa0a0a0a0, base + GIC_DIST_PRI + i * 4 / 4);
413 * Disable all interrupts. Leave the PPI and SGIs alone
414 * as these enables are banked registers.
416 for (i = 32; i < gic_irqs; i += 32)
417 writel_relaxed(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i * 4 / 32);
419 writel_relaxed(1, base + GIC_DIST_CTRL);
422 static void __cpuinit gic_cpu_init(struct gic_chip_data *gic)
424 void __iomem *dist_base = gic_data_dist_base(gic);
425 void __iomem *base = gic_data_cpu_base(gic);
426 unsigned int cpu_mask, cpu = smp_processor_id();
430 * Get what the GIC says our CPU mask is.
432 BUG_ON(cpu >= NR_GIC_CPU_IF);
433 cpu_mask = gic_get_cpumask(gic);
434 gic_cpu_map[cpu] = cpu_mask;
437 * Clear our mask from the other map entries in case they're
440 for (i = 0; i < NR_GIC_CPU_IF; i++)
442 gic_cpu_map[i] &= ~cpu_mask;
445 * Deal with the banked PPI and SGI interrupts - disable all
446 * PPI interrupts, ensure all SGI interrupts are enabled.
448 writel_relaxed(0xffff0000, dist_base + GIC_DIST_ENABLE_CLEAR);
449 writel_relaxed(0x0000ffff, dist_base + GIC_DIST_ENABLE_SET);
452 * Set priority on PPI and SGI interrupts
454 for (i = 0; i < 32; i += 4)
455 writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4 / 4);
457 writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
458 writel_relaxed(1, base + GIC_CPU_CTRL);
463 * Saves the GIC distributor registers during suspend or idle. Must be called
464 * with interrupts disabled but before powering down the GIC. After calling
465 * this function, no interrupts will be delivered by the GIC, and another
466 * platform-specific wakeup source must be enabled.
468 static void gic_dist_save(unsigned int gic_nr)
470 unsigned int gic_irqs;
471 void __iomem *dist_base;
474 if (gic_nr >= MAX_GIC_NR)
477 gic_irqs = gic_data[gic_nr].gic_irqs;
478 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
483 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
484 gic_data[gic_nr].saved_spi_conf[i] =
485 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
487 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
488 gic_data[gic_nr].saved_spi_target[i] =
489 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
491 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
492 gic_data[gic_nr].saved_spi_enable[i] =
493 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
497 * Restores the GIC distributor registers during resume or when coming out of
498 * idle. Must be called before enabling interrupts. If a level interrupt
499 * that occured while the GIC was suspended is still present, it will be
500 * handled normally, but any edge interrupts that occured will not be seen by
501 * the GIC and need to be handled by the platform-specific wakeup source.
503 static void gic_dist_restore(unsigned int gic_nr)
505 unsigned int gic_irqs;
507 void __iomem *dist_base;
509 if (gic_nr >= MAX_GIC_NR)
512 gic_irqs = gic_data[gic_nr].gic_irqs;
513 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
518 writel_relaxed(0, dist_base + GIC_DIST_CTRL);
520 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
521 writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
522 dist_base + GIC_DIST_CONFIG + i * 4);
524 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
525 writel_relaxed(0xa0a0a0a0,
526 dist_base + GIC_DIST_PRI + i * 4);
528 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
529 writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
530 dist_base + GIC_DIST_TARGET + i * 4);
532 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
533 writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
534 dist_base + GIC_DIST_ENABLE_SET + i * 4);
536 writel_relaxed(1, dist_base + GIC_DIST_CTRL);
539 static void gic_cpu_save(unsigned int gic_nr)
543 void __iomem *dist_base;
544 void __iomem *cpu_base;
546 if (gic_nr >= MAX_GIC_NR)
549 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
550 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
552 if (!dist_base || !cpu_base)
555 ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
556 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
557 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
559 ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
560 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
561 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
565 static void gic_cpu_restore(unsigned int gic_nr)
569 void __iomem *dist_base;
570 void __iomem *cpu_base;
572 if (gic_nr >= MAX_GIC_NR)
575 dist_base = gic_data_dist_base(&gic_data[gic_nr]);
576 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
578 if (!dist_base || !cpu_base)
581 ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
582 for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
583 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
585 ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
586 for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
587 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
589 for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
590 writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4);
592 writel_relaxed(0xf0, cpu_base + GIC_CPU_PRIMASK);
593 writel_relaxed(1, cpu_base + GIC_CPU_CTRL);
596 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
600 for (i = 0; i < MAX_GIC_NR; i++) {
601 #ifdef CONFIG_GIC_NON_BANKED
602 /* Skip over unused GICs */
603 if (!gic_data[i].get_base)
610 case CPU_PM_ENTER_FAILED:
614 case CPU_CLUSTER_PM_ENTER:
617 case CPU_CLUSTER_PM_ENTER_FAILED:
618 case CPU_CLUSTER_PM_EXIT:
627 static struct notifier_block gic_notifier_block = {
628 .notifier_call = gic_notifier,
631 static void __init gic_pm_init(struct gic_chip_data *gic)
633 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
635 BUG_ON(!gic->saved_ppi_enable);
637 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
639 BUG_ON(!gic->saved_ppi_conf);
641 if (gic == &gic_data[0])
642 cpu_pm_register_notifier(&gic_notifier_block);
645 static void __init gic_pm_init(struct gic_chip_data *gic)
651 void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
654 unsigned long map = 0;
656 /* Convert our logical CPU mask into a physical one. */
657 for_each_cpu(cpu, mask)
658 map |= gic_cpu_map[cpu];
661 * Ensure that stores to Normal memory are visible to the
662 * other CPUs before issuing the IPI.
666 /* this always happens on GIC0 */
667 writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
671 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
675 irq_set_percpu_devid(irq);
676 irq_set_chip_and_handler(irq, &gic_chip,
677 handle_percpu_devid_irq);
678 set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
680 irq_set_chip_and_handler(irq, &gic_chip,
682 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
684 irq_set_chip_data(irq, d->host_data);
688 static int gic_irq_domain_xlate(struct irq_domain *d,
689 struct device_node *controller,
690 const u32 *intspec, unsigned int intsize,
691 unsigned long *out_hwirq, unsigned int *out_type)
693 if (d->of_node != controller)
698 /* Get the interrupt number and add 16 to skip over SGIs */
699 *out_hwirq = intspec[1] + 16;
701 /* For SPIs, we need to add 16 more to get the GIC irq ID number */
705 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
710 static int __cpuinit gic_secondary_init(struct notifier_block *nfb,
711 unsigned long action, void *hcpu)
713 if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
714 gic_cpu_init(&gic_data[0]);
719 * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
720 * priority because the GIC needs to be up before the ARM generic timers.
722 static struct notifier_block __cpuinitdata gic_cpu_notifier = {
723 .notifier_call = gic_secondary_init,
728 const struct irq_domain_ops gic_irq_domain_ops = {
729 .map = gic_irq_domain_map,
730 .xlate = gic_irq_domain_xlate,
733 void __init gic_init_bases(unsigned int gic_nr, int irq_start,
734 void __iomem *dist_base, void __iomem *cpu_base,
735 u32 percpu_offset, struct device_node *node)
737 irq_hw_number_t hwirq_base;
738 struct gic_chip_data *gic;
739 int gic_irqs, irq_base, i;
741 BUG_ON(gic_nr >= MAX_GIC_NR);
743 gic = &gic_data[gic_nr];
744 #ifdef CONFIG_GIC_NON_BANKED
745 if (percpu_offset) { /* Frankein-GIC without banked registers... */
748 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
749 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
750 if (WARN_ON(!gic->dist_base.percpu_base ||
751 !gic->cpu_base.percpu_base)) {
752 free_percpu(gic->dist_base.percpu_base);
753 free_percpu(gic->cpu_base.percpu_base);
757 for_each_possible_cpu(cpu) {
758 u32 mpidr = cpu_logical_map(cpu);
759 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
760 unsigned long offset = percpu_offset * core_id;
761 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
762 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
765 gic_set_base_accessor(gic, gic_get_percpu_base);
768 { /* Normal, sane GIC... */
770 "GIC_NON_BANKED not enabled, ignoring %08x offset!",
772 gic->dist_base.common_base = dist_base;
773 gic->cpu_base.common_base = cpu_base;
774 gic_set_base_accessor(gic, gic_get_common_base);
778 * Initialize the CPU interface map to all CPUs.
779 * It will be refined as each CPU probes its ID.
781 for (i = 0; i < NR_GIC_CPU_IF; i++)
782 gic_cpu_map[i] = 0xff;
785 * For primary GICs, skip over SGIs.
786 * For secondary GICs, skip over PPIs, too.
788 if (gic_nr == 0 && (irq_start & 31) > 0) {
791 irq_start = (irq_start & ~31) + 16;
797 * Find out how many interrupts are supported.
798 * The GIC only supports up to 1020 interrupt sources.
800 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
801 gic_irqs = (gic_irqs + 1) * 32;
804 gic->gic_irqs = gic_irqs;
806 gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
807 irq_base = irq_alloc_descs(irq_start, 16, gic_irqs, numa_node_id());
808 if (IS_ERR_VALUE(irq_base)) {
809 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
811 irq_base = irq_start;
813 gic->domain = irq_domain_add_legacy(node, gic_irqs, irq_base,
814 hwirq_base, &gic_irq_domain_ops, gic);
815 if (WARN_ON(!gic->domain))
819 set_smp_cross_call(gic_raise_softirq);
820 register_cpu_notifier(&gic_cpu_notifier);
823 set_handle_irq(gic_handle_irq);
825 gic_chip.flags |= gic_arch_extn.flags;
832 static int gic_cnt __initdata;
834 int __init gic_of_init(struct device_node *node, struct device_node *parent)
836 void __iomem *cpu_base;
837 void __iomem *dist_base;
844 dist_base = of_iomap(node, 0);
845 WARN(!dist_base, "unable to map gic dist registers\n");
847 cpu_base = of_iomap(node, 1);
848 WARN(!cpu_base, "unable to map gic cpu registers\n");
850 if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
853 gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, node);
856 irq = irq_of_parse_and_map(node, 0);
857 gic_cascade_irq(gic_cnt, irq);
862 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
863 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
864 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
865 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
866 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);