| /* |
| * 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.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 <linux/irqchip/chained_irq.h> |
| #include <linux/irqchip/arm-gic.h> |
| |
| #include <asm/cputype.h> |
| #include <asm/irq.h> |
| #include <asm/exception.h> |
| #include <asm/smp_plat.h> |
| |
| #include "irq-gic-common.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 raw_cpu_read(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); |
| |
| /* 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); |
| |
| gic_configure_irq(gicirq, type, base, NULL); |
| |
| 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); |
| |
| /* the genirq layer expects 0 if we can't retrigger in hardware */ |
| return 0; |
| } |
| |
| #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 cpu, shift = (gic_irq(d) % 4) * 8; |
| u32 val, mask, bit; |
| |
| if (!force) |
| cpu = cpumask_any_and(mask_val, cpu_online_mask); |
| else |
| cpu = cpumask_first(mask_val); |
| |
| if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids) |
| return -EINVAL; |
| |
| raw_spin_lock(&irq_controller_lock); |
| mask = 0xff << shift; |
| bit = gic_cpu_map[cpu] << shift; |
| 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 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 & GICC_IAR_INT_ID_MASK; |
| |
| 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)) |
| handle_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 u8 gic_get_cpumask(struct gic_chip_data *gic) |
| { |
| void __iomem *base = gic_data_dist_base(gic); |
| u32 mask, i; |
| |
| for (i = mask = 0; i < 32; i += 4) { |
| mask = readl_relaxed(base + GIC_DIST_TARGET + i); |
| mask |= mask >> 16; |
| mask |= mask >> 8; |
| if (mask) |
| break; |
| } |
| |
| if (!mask) |
| pr_crit("GIC CPU mask not found - kernel will fail to boot.\n"); |
| |
| return mask; |
| } |
| |
| 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 this CPU only. |
| */ |
| cpumask = gic_get_cpumask(gic); |
| cpumask |= cpumask << 8; |
| cpumask |= cpumask << 16; |
| for (i = 32; i < gic_irqs; i += 4) |
| writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4); |
| |
| gic_dist_config(base, gic_irqs, NULL); |
| |
| writel_relaxed(1, base + GIC_DIST_CTRL); |
| } |
| |
| static void 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 = gic_get_cpumask(gic); |
| 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; |
| |
| gic_cpu_config(dist_base, NULL); |
| |
| writel_relaxed(0xf0, base + GIC_CPU_PRIMASK); |
| writel_relaxed(1, base + GIC_CPU_CTRL); |
| } |
| |
| void gic_cpu_if_down(void) |
| { |
| void __iomem *cpu_base = gic_data_cpu_base(&gic_data[0]); |
| writel_relaxed(0, cpu_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 = raw_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 = raw_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 = raw_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 = raw_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 |
| static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) |
| { |
| int cpu; |
| unsigned long flags, map = 0; |
| |
| raw_spin_lock_irqsave(&irq_controller_lock, flags); |
| |
| /* Convert our logical CPU mask into a physical one. */ |
| for_each_cpu(cpu, mask) |
| map |= gic_cpu_map[cpu]; |
| |
| /* |
| * Ensure that stores to Normal memory are visible to the |
| * other CPUs before they observe us issuing the IPI. |
| */ |
| dmb(ishst); |
| |
| /* this always happens on GIC0 */ |
| writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); |
| |
| raw_spin_unlock_irqrestore(&irq_controller_lock, flags); |
| } |
| #endif |
| |
| #ifdef CONFIG_BL_SWITCHER |
| /* |
| * gic_send_sgi - send a SGI directly to given CPU interface number |
| * |
| * cpu_id: the ID for the destination CPU interface |
| * irq: the IPI number to send a SGI for |
| */ |
| void gic_send_sgi(unsigned int cpu_id, unsigned int irq) |
| { |
| BUG_ON(cpu_id >= NR_GIC_CPU_IF); |
| cpu_id = 1 << cpu_id; |
| /* this always happens on GIC0 */ |
| writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); |
| } |
| |
| /* |
| * gic_get_cpu_id - get the CPU interface ID for the specified CPU |
| * |
| * @cpu: the logical CPU number to get the GIC ID for. |
| * |
| * Return the CPU interface ID for the given logical CPU number, |
| * or -1 if the CPU number is too large or the interface ID is |
| * unknown (more than one bit set). |
| */ |
| int gic_get_cpu_id(unsigned int cpu) |
| { |
| unsigned int cpu_bit; |
| |
| if (cpu >= NR_GIC_CPU_IF) |
| return -1; |
| cpu_bit = gic_cpu_map[cpu]; |
| if (cpu_bit & (cpu_bit - 1)) |
| return -1; |
| return __ffs(cpu_bit); |
| } |
| |
| /* |
| * gic_migrate_target - migrate IRQs to another CPU interface |
| * |
| * @new_cpu_id: the CPU target ID to migrate IRQs to |
| * |
| * Migrate all peripheral interrupts with a target matching the current CPU |
| * to the interface corresponding to @new_cpu_id. The CPU interface mapping |
| * is also updated. Targets to other CPU interfaces are unchanged. |
| * This must be called with IRQs locally disabled. |
| */ |
| void gic_migrate_target(unsigned int new_cpu_id) |
| { |
| unsigned int cur_cpu_id, gic_irqs, gic_nr = 0; |
| void __iomem *dist_base; |
| int i, ror_val, cpu = smp_processor_id(); |
| u32 val, cur_target_mask, active_mask; |
| |
| if (gic_nr >= MAX_GIC_NR) |
| BUG(); |
| |
| dist_base = gic_data_dist_base(&gic_data[gic_nr]); |
| if (!dist_base) |
| return; |
| gic_irqs = gic_data[gic_nr].gic_irqs; |
| |
| cur_cpu_id = __ffs(gic_cpu_map[cpu]); |
| cur_target_mask = 0x01010101 << cur_cpu_id; |
| ror_val = (cur_cpu_id - new_cpu_id) & 31; |
| |
| raw_spin_lock(&irq_controller_lock); |
| |
| /* Update the target interface for this logical CPU */ |
| gic_cpu_map[cpu] = 1 << new_cpu_id; |
| |
| /* |
| * Find all the peripheral interrupts targetting the current |
| * CPU interface and migrate them to the new CPU interface. |
| * We skip DIST_TARGET 0 to 7 as they are read-only. |
| */ |
| for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) { |
| val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4); |
| active_mask = val & cur_target_mask; |
| if (active_mask) { |
| val &= ~active_mask; |
| val |= ror32(active_mask, ror_val); |
| writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4); |
| } |
| } |
| |
| raw_spin_unlock(&irq_controller_lock); |
| |
| /* |
| * Now let's migrate and clear any potential SGIs that might be |
| * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET |
| * is a banked register, we can only forward the SGI using |
| * GIC_DIST_SOFTINT. The original SGI source is lost but Linux |
| * doesn't use that information anyway. |
| * |
| * For the same reason we do not adjust SGI source information |
| * for previously sent SGIs by us to other CPUs either. |
| */ |
| for (i = 0; i < 16; i += 4) { |
| int j; |
| val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i); |
| if (!val) |
| continue; |
| writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i); |
| for (j = i; j < i + 4; j++) { |
| if (val & 0xff) |
| writel_relaxed((1 << (new_cpu_id + 16)) | j, |
| dist_base + GIC_DIST_SOFTINT); |
| val >>= 8; |
| } |
| } |
| } |
| |
| /* |
| * gic_get_sgir_physaddr - get the physical address for the SGI register |
| * |
| * REturn the physical address of the SGI register to be used |
| * by some early assembly code when the kernel is not yet available. |
| */ |
| static unsigned long gic_dist_physaddr; |
| |
| unsigned long gic_get_sgir_physaddr(void) |
| { |
| if (!gic_dist_physaddr) |
| return 0; |
| return gic_dist_physaddr + GIC_DIST_SOFTINT; |
| } |
| |
| void __init gic_init_physaddr(struct device_node *node) |
| { |
| struct resource res; |
| if (of_address_to_resource(node, 0, &res) == 0) { |
| gic_dist_physaddr = res.start; |
| pr_info("GIC physical location is %#lx\n", gic_dist_physaddr); |
| } |
| } |
| |
| #else |
| #define gic_init_physaddr(node) do { } while (0) |
| #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); |
| |
| gic_routable_irq_domain_ops->map(d, irq, hw); |
| } |
| irq_set_chip_data(irq, d->host_data); |
| return 0; |
| } |
| |
| static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq) |
| { |
| gic_routable_irq_domain_ops->unmap(d, irq); |
| } |
| |
| 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) |
| { |
| unsigned long ret = 0; |
| |
| 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]) { |
| ret = gic_routable_irq_domain_ops->xlate(d, controller, |
| intspec, |
| intsize, |
| out_hwirq, |
| out_type); |
| |
| if (IS_ERR_VALUE(ret)) |
| return ret; |
| } |
| |
| *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_SMP |
| static int gic_secondary_init(struct notifier_block *nfb, unsigned long action, |
| void *hcpu) |
| { |
| if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) |
| gic_cpu_init(&gic_data[0]); |
| return NOTIFY_OK; |
| } |
| |
| /* |
| * Notifier for enabling the GIC CPU interface. Set an arbitrarily high |
| * priority because the GIC needs to be up before the ARM generic timers. |
| */ |
| static struct notifier_block gic_cpu_notifier = { |
| .notifier_call = gic_secondary_init, |
| .priority = 100, |
| }; |
| #endif |
| |
| static const struct irq_domain_ops gic_irq_domain_ops = { |
| .map = gic_irq_domain_map, |
| .unmap = gic_irq_domain_unmap, |
| .xlate = gic_irq_domain_xlate, |
| }; |
| |
| /* Default functions for routable irq domain */ |
| static int gic_routable_irq_domain_map(struct irq_domain *d, unsigned int irq, |
| irq_hw_number_t hw) |
| { |
| return 0; |
| } |
| |
| static void gic_routable_irq_domain_unmap(struct irq_domain *d, |
| unsigned int irq) |
| { |
| } |
| |
| static int gic_routable_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) |
| { |
| *out_hwirq += 16; |
| return 0; |
| } |
| |
| const struct irq_domain_ops gic_default_routable_irq_domain_ops = { |
| .map = gic_routable_irq_domain_map, |
| .unmap = gic_routable_irq_domain_unmap, |
| .xlate = gic_routable_irq_domain_xlate, |
| }; |
| |
| const struct irq_domain_ops *gic_routable_irq_domain_ops = |
| &gic_default_routable_irq_domain_ops; |
| |
| 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; |
| int nr_routable_irqs; |
| |
| 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) { |
| u32 mpidr = cpu_logical_map(cpu); |
| u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); |
| unsigned long offset = percpu_offset * core_id; |
| *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 */ |
| |
| if (of_property_read_u32(node, "arm,routable-irqs", |
| &nr_routable_irqs)) { |
| 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); |
| } else { |
| gic->domain = irq_domain_add_linear(node, nr_routable_irqs, |
| &gic_irq_domain_ops, |
| gic); |
| } |
| |
| if (WARN_ON(!gic->domain)) |
| return; |
| |
| if (gic_nr == 0) { |
| #ifdef CONFIG_SMP |
| set_smp_cross_call(gic_raise_softirq); |
| register_cpu_notifier(&gic_cpu_notifier); |
| #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); |
| } |
| |
| #ifdef CONFIG_OF |
| static int gic_cnt __initdata; |
| |
| static 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 (!gic_cnt) |
| gic_init_physaddr(node); |
| |
| if (parent) { |
| irq = irq_of_parse_and_map(node, 0); |
| gic_cascade_irq(gic_cnt, irq); |
| } |
| gic_cnt++; |
| return 0; |
| } |
| IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init); |
| 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(cortex_a7_gic, "arm,cortex-a7-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 |