-config ARM_GIC
- bool
- select IRQ_DOMAIN
- select MULTI_IRQ_HANDLER
-
-config GIC_NON_BANKED
- bool
-
config ARM_VIC
bool
select IRQ_DOMAIN
# Makefile for the linux kernel.
#
-obj-$(CONFIG_ARM_GIC) += gic.o
obj-$(CONFIG_ARM_VIC) += vic.o
obj-$(CONFIG_ICST) += icst.o
obj-$(CONFIG_SA1111) += sa1111.o
+++ /dev/null
-/*
- * linux/arch/arm/common/gic.c
- *
- * Copyright (C) 2002 ARM Limited, All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Interrupt architecture for the GIC:
- *
- * o There is one Interrupt Distributor, which receives interrupts
- * from system devices and sends them to the Interrupt Controllers.
- *
- * o There is one CPU Interface per CPU, which sends interrupts sent
- * by the Distributor, and interrupts generated locally, to the
- * associated CPU. The base address of the CPU interface is usually
- * aliased so that the same address points to different chips depending
- * on the CPU it is accessed from.
- *
- * Note that IRQs 0-31 are special - they are local to each CPU.
- * As such, the enable set/clear, pending set/clear and active bit
- * registers are banked per-cpu for these sources.
- */
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/list.h>
-#include <linux/smp.h>
-#include <linux/cpu_pm.h>
-#include <linux/cpumask.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/irqdomain.h>
-#include <linux/interrupt.h>
-#include <linux/percpu.h>
-#include <linux/slab.h>
-
-#include <asm/irq.h>
-#include <asm/exception.h>
-#include <asm/smp_plat.h>
-#include <asm/mach/irq.h>
-#include <asm/hardware/gic.h>
-
-union gic_base {
- void __iomem *common_base;
- void __percpu __iomem **percpu_base;
-};
-
-struct gic_chip_data {
- union gic_base dist_base;
- union gic_base cpu_base;
-#ifdef CONFIG_CPU_PM
- u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
- u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
- u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
- u32 __percpu *saved_ppi_enable;
- u32 __percpu *saved_ppi_conf;
-#endif
- struct irq_domain *domain;
- unsigned int gic_irqs;
-#ifdef CONFIG_GIC_NON_BANKED
- void __iomem *(*get_base)(union gic_base *);
-#endif
-};
-
-static DEFINE_RAW_SPINLOCK(irq_controller_lock);
-
-/*
- * The GIC mapping of CPU interfaces does not necessarily match
- * the logical CPU numbering. Let's use a mapping as returned
- * by the GIC itself.
- */
-#define NR_GIC_CPU_IF 8
-static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
-
-/*
- * Supported arch specific GIC irq extension.
- * Default make them NULL.
- */
-struct irq_chip gic_arch_extn = {
- .irq_eoi = NULL,
- .irq_mask = NULL,
- .irq_unmask = NULL,
- .irq_retrigger = NULL,
- .irq_set_type = NULL,
- .irq_set_wake = NULL,
-};
-
-#ifndef MAX_GIC_NR
-#define MAX_GIC_NR 1
-#endif
-
-static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly;
-
-#ifdef CONFIG_GIC_NON_BANKED
-static void __iomem *gic_get_percpu_base(union gic_base *base)
-{
- return *__this_cpu_ptr(base->percpu_base);
-}
-
-static void __iomem *gic_get_common_base(union gic_base *base)
-{
- return base->common_base;
-}
-
-static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
-{
- return data->get_base(&data->dist_base);
-}
-
-static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
-{
- return data->get_base(&data->cpu_base);
-}
-
-static inline void gic_set_base_accessor(struct gic_chip_data *data,
- void __iomem *(*f)(union gic_base *))
-{
- data->get_base = f;
-}
-#else
-#define gic_data_dist_base(d) ((d)->dist_base.common_base)
-#define gic_data_cpu_base(d) ((d)->cpu_base.common_base)
-#define gic_set_base_accessor(d,f)
-#endif
-
-static inline void __iomem *gic_dist_base(struct irq_data *d)
-{
- struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
- return gic_data_dist_base(gic_data);
-}
-
-static inline void __iomem *gic_cpu_base(struct irq_data *d)
-{
- struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
- return gic_data_cpu_base(gic_data);
-}
-
-static inline unsigned int gic_irq(struct irq_data *d)
-{
- return d->hwirq;
-}
-
-/*
- * Routines to acknowledge, disable and enable interrupts
- */
-static void gic_mask_irq(struct irq_data *d)
-{
- u32 mask = 1 << (gic_irq(d) % 32);
-
- raw_spin_lock(&irq_controller_lock);
- writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_CLEAR + (gic_irq(d) / 32) * 4);
- if (gic_arch_extn.irq_mask)
- gic_arch_extn.irq_mask(d);
- raw_spin_unlock(&irq_controller_lock);
-}
-
-static void gic_unmask_irq(struct irq_data *d)
-{
- u32 mask = 1 << (gic_irq(d) % 32);
-
- raw_spin_lock(&irq_controller_lock);
- if (gic_arch_extn.irq_unmask)
- gic_arch_extn.irq_unmask(d);
- writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_SET + (gic_irq(d) / 32) * 4);
- raw_spin_unlock(&irq_controller_lock);
-}
-
-static void gic_eoi_irq(struct irq_data *d)
-{
- if (gic_arch_extn.irq_eoi) {
- raw_spin_lock(&irq_controller_lock);
- gic_arch_extn.irq_eoi(d);
- raw_spin_unlock(&irq_controller_lock);
- }
-
- writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
-}
-
-static int gic_set_type(struct irq_data *d, unsigned int type)
-{
- void __iomem *base = gic_dist_base(d);
- unsigned int gicirq = gic_irq(d);
- u32 enablemask = 1 << (gicirq % 32);
- u32 enableoff = (gicirq / 32) * 4;
- u32 confmask = 0x2 << ((gicirq % 16) * 2);
- u32 confoff = (gicirq / 16) * 4;
- bool enabled = false;
- u32 val;
-
- /* Interrupt configuration for SGIs can't be changed */
- if (gicirq < 16)
- return -EINVAL;
-
- if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
- return -EINVAL;
-
- raw_spin_lock(&irq_controller_lock);
-
- if (gic_arch_extn.irq_set_type)
- gic_arch_extn.irq_set_type(d, type);
-
- val = readl_relaxed(base + GIC_DIST_CONFIG + confoff);
- if (type == IRQ_TYPE_LEVEL_HIGH)
- val &= ~confmask;
- else if (type == IRQ_TYPE_EDGE_RISING)
- val |= confmask;
-
- /*
- * As recommended by the spec, disable the interrupt before changing
- * the configuration
- */
- if (readl_relaxed(base + GIC_DIST_ENABLE_SET + enableoff) & enablemask) {
- writel_relaxed(enablemask, base + GIC_DIST_ENABLE_CLEAR + enableoff);
- enabled = true;
- }
-
- writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
-
- if (enabled)
- writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff);
-
- raw_spin_unlock(&irq_controller_lock);
-
- return 0;
-}
-
-static int gic_retrigger(struct irq_data *d)
-{
- if (gic_arch_extn.irq_retrigger)
- return gic_arch_extn.irq_retrigger(d);
-
- return -ENXIO;
-}
-
-#ifdef CONFIG_SMP
-static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
- bool force)
-{
- void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
- unsigned int shift = (gic_irq(d) % 4) * 8;
- unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
- u32 val, mask, bit;
-
- if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
- return -EINVAL;
-
- mask = 0xff << shift;
- bit = gic_cpu_map[cpu] << shift;
-
- raw_spin_lock(&irq_controller_lock);
- val = readl_relaxed(reg) & ~mask;
- writel_relaxed(val | bit, reg);
- raw_spin_unlock(&irq_controller_lock);
-
- return IRQ_SET_MASK_OK;
-}
-#endif
-
-#ifdef CONFIG_PM
-static int gic_set_wake(struct irq_data *d, unsigned int on)
-{
- int ret = -ENXIO;
-
- if (gic_arch_extn.irq_set_wake)
- ret = gic_arch_extn.irq_set_wake(d, on);
-
- return ret;
-}
-
-#else
-#define gic_set_wake NULL
-#endif
-
-static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
-{
- u32 irqstat, irqnr;
- struct gic_chip_data *gic = &gic_data[0];
- void __iomem *cpu_base = gic_data_cpu_base(gic);
-
- do {
- irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
- irqnr = irqstat & ~0x1c00;
-
- if (likely(irqnr > 15 && irqnr < 1021)) {
- irqnr = irq_find_mapping(gic->domain, irqnr);
- handle_IRQ(irqnr, regs);
- continue;
- }
- if (irqnr < 16) {
- writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
-#ifdef CONFIG_SMP
- handle_IPI(irqnr, regs);
-#endif
- continue;
- }
- break;
- } while (1);
-}
-
-static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
-{
- struct gic_chip_data *chip_data = irq_get_handler_data(irq);
- struct irq_chip *chip = irq_get_chip(irq);
- unsigned int cascade_irq, gic_irq;
- unsigned long status;
-
- chained_irq_enter(chip, desc);
-
- raw_spin_lock(&irq_controller_lock);
- status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
- raw_spin_unlock(&irq_controller_lock);
-
- gic_irq = (status & 0x3ff);
- if (gic_irq == 1023)
- goto out;
-
- cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
- if (unlikely(gic_irq < 32 || gic_irq > 1020))
- do_bad_IRQ(cascade_irq, desc);
- else
- generic_handle_irq(cascade_irq);
-
- out:
- chained_irq_exit(chip, desc);
-}
-
-static struct irq_chip gic_chip = {
- .name = "GIC",
- .irq_mask = gic_mask_irq,
- .irq_unmask = gic_unmask_irq,
- .irq_eoi = gic_eoi_irq,
- .irq_set_type = gic_set_type,
- .irq_retrigger = gic_retrigger,
-#ifdef CONFIG_SMP
- .irq_set_affinity = gic_set_affinity,
-#endif
- .irq_set_wake = gic_set_wake,
-};
-
-void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
-{
- if (gic_nr >= MAX_GIC_NR)
- BUG();
- if (irq_set_handler_data(irq, &gic_data[gic_nr]) != 0)
- BUG();
- irq_set_chained_handler(irq, gic_handle_cascade_irq);
-}
-
-static void __init gic_dist_init(struct gic_chip_data *gic)
-{
- unsigned int i;
- u32 cpumask;
- unsigned int gic_irqs = gic->gic_irqs;
- void __iomem *base = gic_data_dist_base(gic);
-
- writel_relaxed(0, base + GIC_DIST_CTRL);
-
- /*
- * Set all global interrupts to be level triggered, active low.
- */
- for (i = 32; i < gic_irqs; i += 16)
- writel_relaxed(0, base + GIC_DIST_CONFIG + i * 4 / 16);
-
- /*
- * Set all global interrupts to this CPU only.
- */
- cpumask = readl_relaxed(base + GIC_DIST_TARGET + 0);
- for (i = 32; i < gic_irqs; i += 4)
- writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
-
- /*
- * Set priority on all global interrupts.
- */
- for (i = 32; i < gic_irqs; i += 4)
- writel_relaxed(0xa0a0a0a0, base + GIC_DIST_PRI + i * 4 / 4);
-
- /*
- * Disable all interrupts. Leave the PPI and SGIs alone
- * as these enables are banked registers.
- */
- for (i = 32; i < gic_irqs; i += 32)
- writel_relaxed(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i * 4 / 32);
-
- writel_relaxed(1, base + GIC_DIST_CTRL);
-}
-
-static void __cpuinit gic_cpu_init(struct gic_chip_data *gic)
-{
- void __iomem *dist_base = gic_data_dist_base(gic);
- void __iomem *base = gic_data_cpu_base(gic);
- unsigned int cpu_mask, cpu = smp_processor_id();
- int i;
-
- /*
- * Get what the GIC says our CPU mask is.
- */
- BUG_ON(cpu >= NR_GIC_CPU_IF);
- cpu_mask = readl_relaxed(dist_base + GIC_DIST_TARGET + 0);
- gic_cpu_map[cpu] = cpu_mask;
-
- /*
- * Clear our mask from the other map entries in case they're
- * still undefined.
- */
- for (i = 0; i < NR_GIC_CPU_IF; i++)
- if (i != cpu)
- gic_cpu_map[i] &= ~cpu_mask;
-
- /*
- * Deal with the banked PPI and SGI interrupts - disable all
- * PPI interrupts, ensure all SGI interrupts are enabled.
- */
- writel_relaxed(0xffff0000, dist_base + GIC_DIST_ENABLE_CLEAR);
- writel_relaxed(0x0000ffff, dist_base + GIC_DIST_ENABLE_SET);
-
- /*
- * Set priority on PPI and SGI interrupts
- */
- for (i = 0; i < 32; i += 4)
- writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4 / 4);
-
- writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
- writel_relaxed(1, base + GIC_CPU_CTRL);
-}
-
-#ifdef CONFIG_CPU_PM
-/*
- * Saves the GIC distributor registers during suspend or idle. Must be called
- * with interrupts disabled but before powering down the GIC. After calling
- * this function, no interrupts will be delivered by the GIC, and another
- * platform-specific wakeup source must be enabled.
- */
-static void gic_dist_save(unsigned int gic_nr)
-{
- unsigned int gic_irqs;
- void __iomem *dist_base;
- int i;
-
- if (gic_nr >= MAX_GIC_NR)
- BUG();
-
- gic_irqs = gic_data[gic_nr].gic_irqs;
- dist_base = gic_data_dist_base(&gic_data[gic_nr]);
-
- if (!dist_base)
- return;
-
- for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
- gic_data[gic_nr].saved_spi_conf[i] =
- readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
-
- for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
- gic_data[gic_nr].saved_spi_target[i] =
- readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
-
- for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
- gic_data[gic_nr].saved_spi_enable[i] =
- readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
-}
-
-/*
- * Restores the GIC distributor registers during resume or when coming out of
- * idle. Must be called before enabling interrupts. If a level interrupt
- * that occured while the GIC was suspended is still present, it will be
- * handled normally, but any edge interrupts that occured will not be seen by
- * the GIC and need to be handled by the platform-specific wakeup source.
- */
-static void gic_dist_restore(unsigned int gic_nr)
-{
- unsigned int gic_irqs;
- unsigned int i;
- void __iomem *dist_base;
-
- if (gic_nr >= MAX_GIC_NR)
- BUG();
-
- gic_irqs = gic_data[gic_nr].gic_irqs;
- dist_base = gic_data_dist_base(&gic_data[gic_nr]);
-
- if (!dist_base)
- return;
-
- writel_relaxed(0, dist_base + GIC_DIST_CTRL);
-
- for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
- writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
- dist_base + GIC_DIST_CONFIG + i * 4);
-
- for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
- writel_relaxed(0xa0a0a0a0,
- dist_base + GIC_DIST_PRI + i * 4);
-
- for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
- writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
- dist_base + GIC_DIST_TARGET + i * 4);
-
- for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
- writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
- dist_base + GIC_DIST_ENABLE_SET + i * 4);
-
- writel_relaxed(1, dist_base + GIC_DIST_CTRL);
-}
-
-static void gic_cpu_save(unsigned int gic_nr)
-{
- int i;
- u32 *ptr;
- void __iomem *dist_base;
- void __iomem *cpu_base;
-
- if (gic_nr >= MAX_GIC_NR)
- BUG();
-
- dist_base = gic_data_dist_base(&gic_data[gic_nr]);
- cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
-
- if (!dist_base || !cpu_base)
- return;
-
- ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
- for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
- ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
-
- ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
- for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
- ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
-
-}
-
-static void gic_cpu_restore(unsigned int gic_nr)
-{
- int i;
- u32 *ptr;
- void __iomem *dist_base;
- void __iomem *cpu_base;
-
- if (gic_nr >= MAX_GIC_NR)
- BUG();
-
- dist_base = gic_data_dist_base(&gic_data[gic_nr]);
- cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
-
- if (!dist_base || !cpu_base)
- return;
-
- ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
- for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
- writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
-
- ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
- for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
- writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
-
- for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
- writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4);
-
- writel_relaxed(0xf0, cpu_base + GIC_CPU_PRIMASK);
- writel_relaxed(1, cpu_base + GIC_CPU_CTRL);
-}
-
-static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
-{
- int i;
-
- for (i = 0; i < MAX_GIC_NR; i++) {
-#ifdef CONFIG_GIC_NON_BANKED
- /* Skip over unused GICs */
- if (!gic_data[i].get_base)
- continue;
-#endif
- switch (cmd) {
- case CPU_PM_ENTER:
- gic_cpu_save(i);
- break;
- case CPU_PM_ENTER_FAILED:
- case CPU_PM_EXIT:
- gic_cpu_restore(i);
- break;
- case CPU_CLUSTER_PM_ENTER:
- gic_dist_save(i);
- break;
- case CPU_CLUSTER_PM_ENTER_FAILED:
- case CPU_CLUSTER_PM_EXIT:
- gic_dist_restore(i);
- break;
- }
- }
-
- return NOTIFY_OK;
-}
-
-static struct notifier_block gic_notifier_block = {
- .notifier_call = gic_notifier,
-};
-
-static void __init gic_pm_init(struct gic_chip_data *gic)
-{
- gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
- sizeof(u32));
- BUG_ON(!gic->saved_ppi_enable);
-
- gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
- sizeof(u32));
- BUG_ON(!gic->saved_ppi_conf);
-
- if (gic == &gic_data[0])
- cpu_pm_register_notifier(&gic_notifier_block);
-}
-#else
-static void __init gic_pm_init(struct gic_chip_data *gic)
-{
-}
-#endif
-
-#ifdef CONFIG_SMP
-void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
-{
- int cpu;
- unsigned long map = 0;
-
- /* Convert our logical CPU mask into a physical one. */
- for_each_cpu(cpu, mask)
- map |= 1 << cpu_logical_map(cpu);
-
- /*
- * Ensure that stores to Normal memory are visible to the
- * other CPUs before issuing the IPI.
- */
- dsb();
-
- /* this always happens on GIC0 */
- writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
-}
-#endif
-
-static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
- irq_hw_number_t hw)
-{
- if (hw < 32) {
- irq_set_percpu_devid(irq);
- irq_set_chip_and_handler(irq, &gic_chip,
- handle_percpu_devid_irq);
- set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
- } else {
- irq_set_chip_and_handler(irq, &gic_chip,
- handle_fasteoi_irq);
- set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
- }
- irq_set_chip_data(irq, d->host_data);
- return 0;
-}
-
-static int gic_irq_domain_xlate(struct irq_domain *d,
- struct device_node *controller,
- const u32 *intspec, unsigned int intsize,
- unsigned long *out_hwirq, unsigned int *out_type)
-{
- if (d->of_node != controller)
- return -EINVAL;
- if (intsize < 3)
- return -EINVAL;
-
- /* Get the interrupt number and add 16 to skip over SGIs */
- *out_hwirq = intspec[1] + 16;
-
- /* For SPIs, we need to add 16 more to get the GIC irq ID number */
- if (!intspec[0])
- *out_hwirq += 16;
-
- *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
- return 0;
-}
-
-const struct irq_domain_ops gic_irq_domain_ops = {
- .map = gic_irq_domain_map,
- .xlate = gic_irq_domain_xlate,
-};
-
-void __init gic_init_bases(unsigned int gic_nr, int irq_start,
- void __iomem *dist_base, void __iomem *cpu_base,
- u32 percpu_offset, struct device_node *node)
-{
- irq_hw_number_t hwirq_base;
- struct gic_chip_data *gic;
- int gic_irqs, irq_base, i;
-
- BUG_ON(gic_nr >= MAX_GIC_NR);
-
- gic = &gic_data[gic_nr];
-#ifdef CONFIG_GIC_NON_BANKED
- if (percpu_offset) { /* Frankein-GIC without banked registers... */
- unsigned int cpu;
-
- gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
- gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
- if (WARN_ON(!gic->dist_base.percpu_base ||
- !gic->cpu_base.percpu_base)) {
- free_percpu(gic->dist_base.percpu_base);
- free_percpu(gic->cpu_base.percpu_base);
- return;
- }
-
- for_each_possible_cpu(cpu) {
- unsigned long offset = percpu_offset * cpu_logical_map(cpu);
- *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
- *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
- }
-
- gic_set_base_accessor(gic, gic_get_percpu_base);
- } else
-#endif
- { /* Normal, sane GIC... */
- WARN(percpu_offset,
- "GIC_NON_BANKED not enabled, ignoring %08x offset!",
- percpu_offset);
- gic->dist_base.common_base = dist_base;
- gic->cpu_base.common_base = cpu_base;
- gic_set_base_accessor(gic, gic_get_common_base);
- }
-
- /*
- * Initialize the CPU interface map to all CPUs.
- * It will be refined as each CPU probes its ID.
- */
- for (i = 0; i < NR_GIC_CPU_IF; i++)
- gic_cpu_map[i] = 0xff;
-
- /*
- * For primary GICs, skip over SGIs.
- * For secondary GICs, skip over PPIs, too.
- */
- if (gic_nr == 0 && (irq_start & 31) > 0) {
- hwirq_base = 16;
- if (irq_start != -1)
- irq_start = (irq_start & ~31) + 16;
- } else {
- hwirq_base = 32;
- }
-
- /*
- * Find out how many interrupts are supported.
- * The GIC only supports up to 1020 interrupt sources.
- */
- gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
- gic_irqs = (gic_irqs + 1) * 32;
- if (gic_irqs > 1020)
- gic_irqs = 1020;
- gic->gic_irqs = gic_irqs;
-
- gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
- irq_base = irq_alloc_descs(irq_start, 16, gic_irqs, numa_node_id());
- if (IS_ERR_VALUE(irq_base)) {
- WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
- irq_start);
- irq_base = irq_start;
- }
- gic->domain = irq_domain_add_legacy(node, gic_irqs, irq_base,
- hwirq_base, &gic_irq_domain_ops, gic);
- if (WARN_ON(!gic->domain))
- return;
-
-#ifdef CONFIG_SMP
- set_smp_cross_call(gic_raise_softirq);
-#endif
-
- set_handle_irq(gic_handle_irq);
-
- gic_chip.flags |= gic_arch_extn.flags;
- gic_dist_init(gic);
- gic_cpu_init(gic);
- gic_pm_init(gic);
-}
-
-void __cpuinit gic_secondary_init(unsigned int gic_nr)
-{
- BUG_ON(gic_nr >= MAX_GIC_NR);
-
- gic_cpu_init(&gic_data[gic_nr]);
-}
-
-#ifdef CONFIG_OF
-static int gic_cnt __initdata = 0;
-
-int __init gic_of_init(struct device_node *node, struct device_node *parent)
-{
- void __iomem *cpu_base;
- void __iomem *dist_base;
- u32 percpu_offset;
- int irq;
-
- if (WARN_ON(!node))
- return -ENODEV;
-
- dist_base = of_iomap(node, 0);
- WARN(!dist_base, "unable to map gic dist registers\n");
-
- cpu_base = of_iomap(node, 1);
- WARN(!cpu_base, "unable to map gic cpu registers\n");
-
- if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
- percpu_offset = 0;
-
- gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, node);
-
- if (parent) {
- irq = irq_of_parse_and_map(node, 0);
- gic_cascade_irq(gic_cnt, irq);
- }
- gic_cnt++;
- return 0;
-}
-#endif
def_bool y
depends on OF_IRQ
+config ARM_GIC
+ bool
+ select IRQ_DOMAIN
+ select MULTI_IRQ_HANDLER
+
+config GIC_NON_BANKED
+ bool
+
config VERSATILE_FPGA_IRQ
bool
select IRQ_DOMAIN
obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o
obj-$(CONFIG_ARCH_SUNXI) += irq-sunxi.o
-obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
obj-$(CONFIG_ARCH_SPEAR3XX) += spear-shirq.o
+obj-$(CONFIG_ARM_GIC) += irq-gic.o
+obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
--- /dev/null
+/*
+ * linux/arch/arm/common/gic.c
+ *
+ * Copyright (C) 2002 ARM Limited, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Interrupt architecture for the GIC:
+ *
+ * o There is one Interrupt Distributor, which receives interrupts
+ * from system devices and sends them to the Interrupt Controllers.
+ *
+ * o There is one CPU Interface per CPU, which sends interrupts sent
+ * by the Distributor, and interrupts generated locally, to the
+ * associated CPU. The base address of the CPU interface is usually
+ * aliased so that the same address points to different chips depending
+ * on the CPU it is accessed from.
+ *
+ * Note that IRQs 0-31 are special - they are local to each CPU.
+ * As such, the enable set/clear, pending set/clear and active bit
+ * registers are banked per-cpu for these sources.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/smp.h>
+#include <linux/cpu_pm.h>
+#include <linux/cpumask.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/interrupt.h>
+#include <linux/percpu.h>
+#include <linux/slab.h>
+
+#include <asm/irq.h>
+#include <asm/exception.h>
+#include <asm/smp_plat.h>
+#include <asm/mach/irq.h>
+#include <asm/hardware/gic.h>
+
+#include "irqchip.h"
+
+union gic_base {
+ void __iomem *common_base;
+ void __percpu __iomem **percpu_base;
+};
+
+struct gic_chip_data {
+ union gic_base dist_base;
+ union gic_base cpu_base;
+#ifdef CONFIG_CPU_PM
+ u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
+ u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
+ u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
+ u32 __percpu *saved_ppi_enable;
+ u32 __percpu *saved_ppi_conf;
+#endif
+ struct irq_domain *domain;
+ unsigned int gic_irqs;
+#ifdef CONFIG_GIC_NON_BANKED
+ void __iomem *(*get_base)(union gic_base *);
+#endif
+};
+
+static DEFINE_RAW_SPINLOCK(irq_controller_lock);
+
+/*
+ * The GIC mapping of CPU interfaces does not necessarily match
+ * the logical CPU numbering. Let's use a mapping as returned
+ * by the GIC itself.
+ */
+#define NR_GIC_CPU_IF 8
+static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
+
+/*
+ * Supported arch specific GIC irq extension.
+ * Default make them NULL.
+ */
+struct irq_chip gic_arch_extn = {
+ .irq_eoi = NULL,
+ .irq_mask = NULL,
+ .irq_unmask = NULL,
+ .irq_retrigger = NULL,
+ .irq_set_type = NULL,
+ .irq_set_wake = NULL,
+};
+
+#ifndef MAX_GIC_NR
+#define MAX_GIC_NR 1
+#endif
+
+static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly;
+
+#ifdef CONFIG_GIC_NON_BANKED
+static void __iomem *gic_get_percpu_base(union gic_base *base)
+{
+ return *__this_cpu_ptr(base->percpu_base);
+}
+
+static void __iomem *gic_get_common_base(union gic_base *base)
+{
+ return base->common_base;
+}
+
+static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
+{
+ return data->get_base(&data->dist_base);
+}
+
+static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
+{
+ return data->get_base(&data->cpu_base);
+}
+
+static inline void gic_set_base_accessor(struct gic_chip_data *data,
+ void __iomem *(*f)(union gic_base *))
+{
+ data->get_base = f;
+}
+#else
+#define gic_data_dist_base(d) ((d)->dist_base.common_base)
+#define gic_data_cpu_base(d) ((d)->cpu_base.common_base)
+#define gic_set_base_accessor(d,f)
+#endif
+
+static inline void __iomem *gic_dist_base(struct irq_data *d)
+{
+ struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
+ return gic_data_dist_base(gic_data);
+}
+
+static inline void __iomem *gic_cpu_base(struct irq_data *d)
+{
+ struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
+ return gic_data_cpu_base(gic_data);
+}
+
+static inline unsigned int gic_irq(struct irq_data *d)
+{
+ return d->hwirq;
+}
+
+/*
+ * Routines to acknowledge, disable and enable interrupts
+ */
+static void gic_mask_irq(struct irq_data *d)
+{
+ u32 mask = 1 << (gic_irq(d) % 32);
+
+ raw_spin_lock(&irq_controller_lock);
+ writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_CLEAR + (gic_irq(d) / 32) * 4);
+ if (gic_arch_extn.irq_mask)
+ gic_arch_extn.irq_mask(d);
+ raw_spin_unlock(&irq_controller_lock);
+}
+
+static void gic_unmask_irq(struct irq_data *d)
+{
+ u32 mask = 1 << (gic_irq(d) % 32);
+
+ raw_spin_lock(&irq_controller_lock);
+ if (gic_arch_extn.irq_unmask)
+ gic_arch_extn.irq_unmask(d);
+ writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_SET + (gic_irq(d) / 32) * 4);
+ raw_spin_unlock(&irq_controller_lock);
+}
+
+static void gic_eoi_irq(struct irq_data *d)
+{
+ if (gic_arch_extn.irq_eoi) {
+ raw_spin_lock(&irq_controller_lock);
+ gic_arch_extn.irq_eoi(d);
+ raw_spin_unlock(&irq_controller_lock);
+ }
+
+ writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
+}
+
+static int gic_set_type(struct irq_data *d, unsigned int type)
+{
+ void __iomem *base = gic_dist_base(d);
+ unsigned int gicirq = gic_irq(d);
+ u32 enablemask = 1 << (gicirq % 32);
+ u32 enableoff = (gicirq / 32) * 4;
+ u32 confmask = 0x2 << ((gicirq % 16) * 2);
+ u32 confoff = (gicirq / 16) * 4;
+ bool enabled = false;
+ u32 val;
+
+ /* Interrupt configuration for SGIs can't be changed */
+ if (gicirq < 16)
+ return -EINVAL;
+
+ if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
+ return -EINVAL;
+
+ raw_spin_lock(&irq_controller_lock);
+
+ if (gic_arch_extn.irq_set_type)
+ gic_arch_extn.irq_set_type(d, type);
+
+ val = readl_relaxed(base + GIC_DIST_CONFIG + confoff);
+ if (type == IRQ_TYPE_LEVEL_HIGH)
+ val &= ~confmask;
+ else if (type == IRQ_TYPE_EDGE_RISING)
+ val |= confmask;
+
+ /*
+ * As recommended by the spec, disable the interrupt before changing
+ * the configuration
+ */
+ if (readl_relaxed(base + GIC_DIST_ENABLE_SET + enableoff) & enablemask) {
+ writel_relaxed(enablemask, base + GIC_DIST_ENABLE_CLEAR + enableoff);
+ enabled = true;
+ }
+
+ writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
+
+ if (enabled)
+ writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff);
+
+ raw_spin_unlock(&irq_controller_lock);
+
+ return 0;
+}
+
+static int gic_retrigger(struct irq_data *d)
+{
+ if (gic_arch_extn.irq_retrigger)
+ return gic_arch_extn.irq_retrigger(d);
+
+ return -ENXIO;
+}
+
+#ifdef CONFIG_SMP
+static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
+ bool force)
+{
+ void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
+ unsigned int shift = (gic_irq(d) % 4) * 8;
+ unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
+ u32 val, mask, bit;
+
+ if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
+ return -EINVAL;
+
+ mask = 0xff << shift;
+ bit = gic_cpu_map[cpu] << shift;
+
+ raw_spin_lock(&irq_controller_lock);
+ val = readl_relaxed(reg) & ~mask;
+ writel_relaxed(val | bit, reg);
+ raw_spin_unlock(&irq_controller_lock);
+
+ return IRQ_SET_MASK_OK;
+}
+#endif
+
+#ifdef CONFIG_PM
+static int gic_set_wake(struct irq_data *d, unsigned int on)
+{
+ int ret = -ENXIO;
+
+ if (gic_arch_extn.irq_set_wake)
+ ret = gic_arch_extn.irq_set_wake(d, on);
+
+ return ret;
+}
+
+#else
+#define gic_set_wake NULL
+#endif
+
+static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
+{
+ u32 irqstat, irqnr;
+ struct gic_chip_data *gic = &gic_data[0];
+ void __iomem *cpu_base = gic_data_cpu_base(gic);
+
+ do {
+ irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
+ irqnr = irqstat & ~0x1c00;
+
+ if (likely(irqnr > 15 && irqnr < 1021)) {
+ irqnr = irq_find_mapping(gic->domain, irqnr);
+ handle_IRQ(irqnr, regs);
+ continue;
+ }
+ if (irqnr < 16) {
+ writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
+#ifdef CONFIG_SMP
+ handle_IPI(irqnr, regs);
+#endif
+ continue;
+ }
+ break;
+ } while (1);
+}
+
+static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
+{
+ struct gic_chip_data *chip_data = irq_get_handler_data(irq);
+ struct irq_chip *chip = irq_get_chip(irq);
+ unsigned int cascade_irq, gic_irq;
+ unsigned long status;
+
+ chained_irq_enter(chip, desc);
+
+ raw_spin_lock(&irq_controller_lock);
+ status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
+ raw_spin_unlock(&irq_controller_lock);
+
+ gic_irq = (status & 0x3ff);
+ if (gic_irq == 1023)
+ goto out;
+
+ cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
+ if (unlikely(gic_irq < 32 || gic_irq > 1020))
+ do_bad_IRQ(cascade_irq, desc);
+ else
+ generic_handle_irq(cascade_irq);
+
+ out:
+ chained_irq_exit(chip, desc);
+}
+
+static struct irq_chip gic_chip = {
+ .name = "GIC",
+ .irq_mask = gic_mask_irq,
+ .irq_unmask = gic_unmask_irq,
+ .irq_eoi = gic_eoi_irq,
+ .irq_set_type = gic_set_type,
+ .irq_retrigger = gic_retrigger,
+#ifdef CONFIG_SMP
+ .irq_set_affinity = gic_set_affinity,
+#endif
+ .irq_set_wake = gic_set_wake,
+};
+
+void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
+{
+ if (gic_nr >= MAX_GIC_NR)
+ BUG();
+ if (irq_set_handler_data(irq, &gic_data[gic_nr]) != 0)
+ BUG();
+ irq_set_chained_handler(irq, gic_handle_cascade_irq);
+}
+
+static void __init gic_dist_init(struct gic_chip_data *gic)
+{
+ unsigned int i;
+ u32 cpumask;
+ unsigned int gic_irqs = gic->gic_irqs;
+ void __iomem *base = gic_data_dist_base(gic);
+
+ writel_relaxed(0, base + GIC_DIST_CTRL);
+
+ /*
+ * Set all global interrupts to be level triggered, active low.
+ */
+ for (i = 32; i < gic_irqs; i += 16)
+ writel_relaxed(0, base + GIC_DIST_CONFIG + i * 4 / 16);
+
+ /*
+ * Set all global interrupts to this CPU only.
+ */
+ cpumask = readl_relaxed(base + GIC_DIST_TARGET + 0);
+ for (i = 32; i < gic_irqs; i += 4)
+ writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
+
+ /*
+ * Set priority on all global interrupts.
+ */
+ for (i = 32; i < gic_irqs; i += 4)
+ writel_relaxed(0xa0a0a0a0, base + GIC_DIST_PRI + i * 4 / 4);
+
+ /*
+ * Disable all interrupts. Leave the PPI and SGIs alone
+ * as these enables are banked registers.
+ */
+ for (i = 32; i < gic_irqs; i += 32)
+ writel_relaxed(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i * 4 / 32);
+
+ writel_relaxed(1, base + GIC_DIST_CTRL);
+}
+
+static void __cpuinit gic_cpu_init(struct gic_chip_data *gic)
+{
+ void __iomem *dist_base = gic_data_dist_base(gic);
+ void __iomem *base = gic_data_cpu_base(gic);
+ unsigned int cpu_mask, cpu = smp_processor_id();
+ int i;
+
+ /*
+ * Get what the GIC says our CPU mask is.
+ */
+ BUG_ON(cpu >= NR_GIC_CPU_IF);
+ cpu_mask = readl_relaxed(dist_base + GIC_DIST_TARGET + 0);
+ gic_cpu_map[cpu] = cpu_mask;
+
+ /*
+ * Clear our mask from the other map entries in case they're
+ * still undefined.
+ */
+ for (i = 0; i < NR_GIC_CPU_IF; i++)
+ if (i != cpu)
+ gic_cpu_map[i] &= ~cpu_mask;
+
+ /*
+ * Deal with the banked PPI and SGI interrupts - disable all
+ * PPI interrupts, ensure all SGI interrupts are enabled.
+ */
+ writel_relaxed(0xffff0000, dist_base + GIC_DIST_ENABLE_CLEAR);
+ writel_relaxed(0x0000ffff, dist_base + GIC_DIST_ENABLE_SET);
+
+ /*
+ * Set priority on PPI and SGI interrupts
+ */
+ for (i = 0; i < 32; i += 4)
+ writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4 / 4);
+
+ writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
+ writel_relaxed(1, base + GIC_CPU_CTRL);
+}
+
+#ifdef CONFIG_CPU_PM
+/*
+ * Saves the GIC distributor registers during suspend or idle. Must be called
+ * with interrupts disabled but before powering down the GIC. After calling
+ * this function, no interrupts will be delivered by the GIC, and another
+ * platform-specific wakeup source must be enabled.
+ */
+static void gic_dist_save(unsigned int gic_nr)
+{
+ unsigned int gic_irqs;
+ void __iomem *dist_base;
+ int i;
+
+ if (gic_nr >= MAX_GIC_NR)
+ BUG();
+
+ gic_irqs = gic_data[gic_nr].gic_irqs;
+ dist_base = gic_data_dist_base(&gic_data[gic_nr]);
+
+ if (!dist_base)
+ return;
+
+ for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
+ gic_data[gic_nr].saved_spi_conf[i] =
+ readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
+
+ for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
+ gic_data[gic_nr].saved_spi_target[i] =
+ readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
+
+ for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
+ gic_data[gic_nr].saved_spi_enable[i] =
+ readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
+}
+
+/*
+ * Restores the GIC distributor registers during resume or when coming out of
+ * idle. Must be called before enabling interrupts. If a level interrupt
+ * that occured while the GIC was suspended is still present, it will be
+ * handled normally, but any edge interrupts that occured will not be seen by
+ * the GIC and need to be handled by the platform-specific wakeup source.
+ */
+static void gic_dist_restore(unsigned int gic_nr)
+{
+ unsigned int gic_irqs;
+ unsigned int i;
+ void __iomem *dist_base;
+
+ if (gic_nr >= MAX_GIC_NR)
+ BUG();
+
+ gic_irqs = gic_data[gic_nr].gic_irqs;
+ dist_base = gic_data_dist_base(&gic_data[gic_nr]);
+
+ if (!dist_base)
+ return;
+
+ writel_relaxed(0, dist_base + GIC_DIST_CTRL);
+
+ for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
+ writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
+ dist_base + GIC_DIST_CONFIG + i * 4);
+
+ for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
+ writel_relaxed(0xa0a0a0a0,
+ dist_base + GIC_DIST_PRI + i * 4);
+
+ for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
+ writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
+ dist_base + GIC_DIST_TARGET + i * 4);
+
+ for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
+ writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
+ dist_base + GIC_DIST_ENABLE_SET + i * 4);
+
+ writel_relaxed(1, dist_base + GIC_DIST_CTRL);
+}
+
+static void gic_cpu_save(unsigned int gic_nr)
+{
+ int i;
+ u32 *ptr;
+ void __iomem *dist_base;
+ void __iomem *cpu_base;
+
+ if (gic_nr >= MAX_GIC_NR)
+ BUG();
+
+ dist_base = gic_data_dist_base(&gic_data[gic_nr]);
+ cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
+
+ if (!dist_base || !cpu_base)
+ return;
+
+ ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
+ for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
+ ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
+
+ ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
+ for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
+ ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
+
+}
+
+static void gic_cpu_restore(unsigned int gic_nr)
+{
+ int i;
+ u32 *ptr;
+ void __iomem *dist_base;
+ void __iomem *cpu_base;
+
+ if (gic_nr >= MAX_GIC_NR)
+ BUG();
+
+ dist_base = gic_data_dist_base(&gic_data[gic_nr]);
+ cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
+
+ if (!dist_base || !cpu_base)
+ return;
+
+ ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
+ for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
+ writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
+
+ ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
+ for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
+ writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
+
+ for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
+ writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4);
+
+ writel_relaxed(0xf0, cpu_base + GIC_CPU_PRIMASK);
+ writel_relaxed(1, cpu_base + GIC_CPU_CTRL);
+}
+
+static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
+{
+ int i;
+
+ for (i = 0; i < MAX_GIC_NR; i++) {
+#ifdef CONFIG_GIC_NON_BANKED
+ /* Skip over unused GICs */
+ if (!gic_data[i].get_base)
+ continue;
+#endif
+ switch (cmd) {
+ case CPU_PM_ENTER:
+ gic_cpu_save(i);
+ break;
+ case CPU_PM_ENTER_FAILED:
+ case CPU_PM_EXIT:
+ gic_cpu_restore(i);
+ break;
+ case CPU_CLUSTER_PM_ENTER:
+ gic_dist_save(i);
+ break;
+ case CPU_CLUSTER_PM_ENTER_FAILED:
+ case CPU_CLUSTER_PM_EXIT:
+ gic_dist_restore(i);
+ break;
+ }
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block gic_notifier_block = {
+ .notifier_call = gic_notifier,
+};
+
+static void __init gic_pm_init(struct gic_chip_data *gic)
+{
+ gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
+ sizeof(u32));
+ BUG_ON(!gic->saved_ppi_enable);
+
+ gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
+ sizeof(u32));
+ BUG_ON(!gic->saved_ppi_conf);
+
+ if (gic == &gic_data[0])
+ cpu_pm_register_notifier(&gic_notifier_block);
+}
+#else
+static void __init gic_pm_init(struct gic_chip_data *gic)
+{
+}
+#endif
+
+#ifdef CONFIG_SMP
+void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
+{
+ int cpu;
+ unsigned long map = 0;
+
+ /* Convert our logical CPU mask into a physical one. */
+ for_each_cpu(cpu, mask)
+ map |= 1 << cpu_logical_map(cpu);
+
+ /*
+ * Ensure that stores to Normal memory are visible to the
+ * other CPUs before issuing the IPI.
+ */
+ dsb();
+
+ /* this always happens on GIC0 */
+ writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
+}
+#endif
+
+static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ if (hw < 32) {
+ irq_set_percpu_devid(irq);
+ irq_set_chip_and_handler(irq, &gic_chip,
+ handle_percpu_devid_irq);
+ set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
+ } else {
+ irq_set_chip_and_handler(irq, &gic_chip,
+ handle_fasteoi_irq);
+ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+ }
+ irq_set_chip_data(irq, d->host_data);
+ return 0;
+}
+
+static int gic_irq_domain_xlate(struct irq_domain *d,
+ struct device_node *controller,
+ const u32 *intspec, unsigned int intsize,
+ unsigned long *out_hwirq, unsigned int *out_type)
+{
+ if (d->of_node != controller)
+ return -EINVAL;
+ if (intsize < 3)
+ return -EINVAL;
+
+ /* Get the interrupt number and add 16 to skip over SGIs */
+ *out_hwirq = intspec[1] + 16;
+
+ /* For SPIs, we need to add 16 more to get the GIC irq ID number */
+ if (!intspec[0])
+ *out_hwirq += 16;
+
+ *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
+ return 0;
+}
+
+const struct irq_domain_ops gic_irq_domain_ops = {
+ .map = gic_irq_domain_map,
+ .xlate = gic_irq_domain_xlate,
+};
+
+void __init gic_init_bases(unsigned int gic_nr, int irq_start,
+ void __iomem *dist_base, void __iomem *cpu_base,
+ u32 percpu_offset, struct device_node *node)
+{
+ irq_hw_number_t hwirq_base;
+ struct gic_chip_data *gic;
+ int gic_irqs, irq_base, i;
+
+ BUG_ON(gic_nr >= MAX_GIC_NR);
+
+ gic = &gic_data[gic_nr];
+#ifdef CONFIG_GIC_NON_BANKED
+ if (percpu_offset) { /* Frankein-GIC without banked registers... */
+ unsigned int cpu;
+
+ gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
+ gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
+ if (WARN_ON(!gic->dist_base.percpu_base ||
+ !gic->cpu_base.percpu_base)) {
+ free_percpu(gic->dist_base.percpu_base);
+ free_percpu(gic->cpu_base.percpu_base);
+ return;
+ }
+
+ for_each_possible_cpu(cpu) {
+ unsigned long offset = percpu_offset * cpu_logical_map(cpu);
+ *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
+ *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
+ }
+
+ gic_set_base_accessor(gic, gic_get_percpu_base);
+ } else
+#endif
+ { /* Normal, sane GIC... */
+ WARN(percpu_offset,
+ "GIC_NON_BANKED not enabled, ignoring %08x offset!",
+ percpu_offset);
+ gic->dist_base.common_base = dist_base;
+ gic->cpu_base.common_base = cpu_base;
+ gic_set_base_accessor(gic, gic_get_common_base);
+ }
+
+ /*
+ * Initialize the CPU interface map to all CPUs.
+ * It will be refined as each CPU probes its ID.
+ */
+ for (i = 0; i < NR_GIC_CPU_IF; i++)
+ gic_cpu_map[i] = 0xff;
+
+ /*
+ * For primary GICs, skip over SGIs.
+ * For secondary GICs, skip over PPIs, too.
+ */
+ if (gic_nr == 0 && (irq_start & 31) > 0) {
+ hwirq_base = 16;
+ if (irq_start != -1)
+ irq_start = (irq_start & ~31) + 16;
+ } else {
+ hwirq_base = 32;
+ }
+
+ /*
+ * Find out how many interrupts are supported.
+ * The GIC only supports up to 1020 interrupt sources.
+ */
+ gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
+ gic_irqs = (gic_irqs + 1) * 32;
+ if (gic_irqs > 1020)
+ gic_irqs = 1020;
+ gic->gic_irqs = gic_irqs;
+
+ gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
+ irq_base = irq_alloc_descs(irq_start, 16, gic_irqs, numa_node_id());
+ if (IS_ERR_VALUE(irq_base)) {
+ WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
+ irq_start);
+ irq_base = irq_start;
+ }
+ gic->domain = irq_domain_add_legacy(node, gic_irqs, irq_base,
+ hwirq_base, &gic_irq_domain_ops, gic);
+ if (WARN_ON(!gic->domain))
+ return;
+
+#ifdef CONFIG_SMP
+ set_smp_cross_call(gic_raise_softirq);
+#endif
+
+ set_handle_irq(gic_handle_irq);
+
+ gic_chip.flags |= gic_arch_extn.flags;
+ gic_dist_init(gic);
+ gic_cpu_init(gic);
+ gic_pm_init(gic);
+}
+
+void __cpuinit gic_secondary_init(unsigned int gic_nr)
+{
+ BUG_ON(gic_nr >= MAX_GIC_NR);
+
+ gic_cpu_init(&gic_data[gic_nr]);
+}
+
+#ifdef CONFIG_OF
+static int gic_cnt __initdata = 0;
+
+int __init gic_of_init(struct device_node *node, struct device_node *parent)
+{
+ void __iomem *cpu_base;
+ void __iomem *dist_base;
+ u32 percpu_offset;
+ int irq;
+
+ if (WARN_ON(!node))
+ return -ENODEV;
+
+ dist_base = of_iomap(node, 0);
+ WARN(!dist_base, "unable to map gic dist registers\n");
+
+ cpu_base = of_iomap(node, 1);
+ WARN(!cpu_base, "unable to map gic cpu registers\n");
+
+ if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
+ percpu_offset = 0;
+
+ gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, node);
+
+ if (parent) {
+ irq = irq_of_parse_and_map(node, 0);
+ gic_cascade_irq(gic_cnt, irq);
+ }
+ gic_cnt++;
+ return 0;
+}
+IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
+IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
+IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
+IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
+
+#endif
projects / mirror_ubuntu-focal-kernel.git / commitdiff