diff options
Diffstat (limited to 'arch/arm/common/gic.c')
| -rw-r--r-- | arch/arm/common/gic.c | 400 |
1 files changed, 341 insertions, 59 deletions
diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c index 3227ca952a12..0e6ae470c94f 100644 --- a/arch/arm/common/gic.c +++ b/arch/arm/common/gic.c @@ -24,16 +24,26 @@ */ #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/mach/irq.h> #include <asm/hardware/gic.h> -static DEFINE_SPINLOCK(irq_controller_lock); +static DEFINE_RAW_SPINLOCK(irq_controller_lock); /* Address of GIC 0 CPU interface */ void __iomem *gic_cpu_base_addr __read_mostly; @@ -71,8 +81,7 @@ static inline void __iomem *gic_cpu_base(struct irq_data *d) static inline unsigned int gic_irq(struct irq_data *d) { - struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); - return d->irq - gic_data->irq_offset; + return d->hwirq; } /* @@ -80,32 +89,32 @@ static inline unsigned int gic_irq(struct irq_data *d) */ static void gic_mask_irq(struct irq_data *d) { - u32 mask = 1 << (d->irq % 32); + u32 mask = 1 << (gic_irq(d) % 32); - spin_lock(&irq_controller_lock); + 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); - spin_unlock(&irq_controller_lock); + raw_spin_unlock(&irq_controller_lock); } static void gic_unmask_irq(struct irq_data *d) { - u32 mask = 1 << (d->irq % 32); + u32 mask = 1 << (gic_irq(d) % 32); - spin_lock(&irq_controller_lock); + 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); - spin_unlock(&irq_controller_lock); + raw_spin_unlock(&irq_controller_lock); } static void gic_eoi_irq(struct irq_data *d) { if (gic_arch_extn.irq_eoi) { - spin_lock(&irq_controller_lock); + raw_spin_lock(&irq_controller_lock); gic_arch_extn.irq_eoi(d); - spin_unlock(&irq_controller_lock); + raw_spin_unlock(&irq_controller_lock); } writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI); @@ -129,7 +138,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type) if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING) return -EINVAL; - spin_lock(&irq_controller_lock); + raw_spin_lock(&irq_controller_lock); if (gic_arch_extn.irq_set_type) gic_arch_extn.irq_set_type(d, type); @@ -154,7 +163,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type) if (enabled) writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff); - spin_unlock(&irq_controller_lock); + raw_spin_unlock(&irq_controller_lock); return 0; } @@ -172,7 +181,7 @@ 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 = (d->irq % 4) * 8; + unsigned int shift = (gic_irq(d) % 4) * 8; unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask); u32 val, mask, bit; @@ -180,12 +189,12 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, return -EINVAL; mask = 0xff << shift; - bit = 1 << (cpu + shift); + bit = 1 << (cpu_logical_map(cpu) + shift); - spin_lock(&irq_controller_lock); + raw_spin_lock(&irq_controller_lock); val = readl_relaxed(reg) & ~mask; writel_relaxed(val | bit, reg); - spin_unlock(&irq_controller_lock); + raw_spin_unlock(&irq_controller_lock); return IRQ_SET_MASK_OK; } @@ -215,15 +224,15 @@ static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) chained_irq_enter(chip, desc); - spin_lock(&irq_controller_lock); + raw_spin_lock(&irq_controller_lock); status = readl_relaxed(chip_data->cpu_base + GIC_CPU_INTACK); - spin_unlock(&irq_controller_lock); + raw_spin_unlock(&irq_controller_lock); gic_irq = (status & 0x3ff); if (gic_irq == 1023) goto out; - cascade_irq = gic_irq + chip_data->irq_offset; + cascade_irq = irq_domain_to_irq(&chip_data->domain, gic_irq); if (unlikely(gic_irq < 32 || gic_irq > 1020 || cascade_irq >= NR_IRQS)) do_bad_IRQ(cascade_irq, desc); else @@ -255,28 +264,26 @@ void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq) irq_set_chained_handler(irq, gic_handle_cascade_irq); } -static void __init gic_dist_init(struct gic_chip_data *gic, - unsigned int irq_start) +static void __init gic_dist_init(struct gic_chip_data *gic) { - unsigned int gic_irqs, irq_limit, i; + unsigned int i, irq; + u32 cpumask; + unsigned int gic_irqs = gic->gic_irqs; + struct irq_domain *domain = &gic->domain; void __iomem *base = gic->dist_base; - u32 cpumask = 1 << smp_processor_id(); + u32 cpu = 0; +#ifdef CONFIG_SMP + cpu = cpu_logical_map(smp_processor_id()); +#endif + + cpumask = 1 << cpu; cpumask |= cpumask << 8; cpumask |= cpumask << 16; writel_relaxed(0, base + GIC_DIST_CTRL); /* - * Find out how many interrupts are supported. - * The GIC only supports up to 1020 interrupt sources. - */ - gic_irqs = readl_relaxed(base + GIC_DIST_CTR) & 0x1f; - gic_irqs = (gic_irqs + 1) * 32; - if (gic_irqs > 1020) - gic_irqs = 1020; - - /* * Set all global interrupts to be level triggered, active low. */ for (i = 32; i < gic_irqs; i += 16) @@ -302,19 +309,20 @@ static void __init gic_dist_init(struct gic_chip_data *gic, writel_relaxed(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i * 4 / 32); /* - * Limit number of interrupts registered to the platform maximum - */ - irq_limit = gic->irq_offset + gic_irqs; - if (WARN_ON(irq_limit > NR_IRQS)) - irq_limit = NR_IRQS; - - /* * Setup the Linux IRQ subsystem. */ - for (i = irq_start; i < irq_limit; i++) { - irq_set_chip_and_handler(i, &gic_chip, handle_fasteoi_irq); - irq_set_chip_data(i, gic); - set_irq_flags(i, IRQF_VALID | IRQF_PROBE); + irq_domain_for_each_irq(domain, i, irq) { + if (i < 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, gic); } writel_relaxed(1, base + GIC_DIST_CTRL); @@ -343,23 +351,270 @@ static void __cpuinit gic_cpu_init(struct gic_chip_data *gic) writel_relaxed(1, base + GIC_CPU_CTRL); } -void __init gic_init(unsigned int gic_nr, unsigned int irq_start, +#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[gic_nr].dist_base; + + 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[gic_nr].dist_base; + + 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[gic_nr].dist_base; + cpu_base = gic_data[gic_nr].cpu_base; + + 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[gic_nr].dist_base; + cpu_base = gic_data[gic_nr].cpu_base; + + 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++) { + 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); + + cpu_pm_register_notifier(&gic_notifier_block); +} +#else +static void __init gic_pm_init(struct gic_chip_data *gic) +{ +} +#endif + +#ifdef CONFIG_OF +static int gic_irq_domain_dt_translate(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; +} +#endif + +const struct irq_domain_ops gic_irq_domain_ops = { +#ifdef CONFIG_OF + .dt_translate = gic_irq_domain_dt_translate, +#endif +}; + +void __init gic_init(unsigned int gic_nr, int irq_start, void __iomem *dist_base, void __iomem *cpu_base) { struct gic_chip_data *gic; + struct irq_domain *domain; + int gic_irqs; BUG_ON(gic_nr >= MAX_GIC_NR); gic = &gic_data[gic_nr]; + domain = &gic->domain; gic->dist_base = dist_base; gic->cpu_base = cpu_base; - gic->irq_offset = (irq_start - 1) & ~31; - if (gic_nr == 0) + /* + * For primary GICs, skip over SGIs. + * For secondary GICs, skip over PPIs, too. + */ + if (gic_nr == 0) { gic_cpu_base_addr = cpu_base; + domain->hwirq_base = 16; + if (irq_start > 0) + irq_start = (irq_start & ~31) + 16; + } else + domain->hwirq_base = 32; + + /* + * Find out how many interrupts are supported. + * The GIC only supports up to 1020 interrupt sources. + */ + gic_irqs = readl_relaxed(dist_base + GIC_DIST_CTR) & 0x1f; + gic_irqs = (gic_irqs + 1) * 32; + if (gic_irqs > 1020) + gic_irqs = 1020; + gic->gic_irqs = gic_irqs; + + domain->nr_irq = gic_irqs - domain->hwirq_base; + domain->irq_base = irq_alloc_descs(irq_start, 16, domain->nr_irq, + numa_node_id()); + if (IS_ERR_VALUE(domain->irq_base)) { + WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", + irq_start); + domain->irq_base = irq_start; + } + domain->priv = gic; + domain->ops = &gic_irq_domain_ops; + irq_domain_add(domain); - gic_dist_init(gic, irq_start); + 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) @@ -369,20 +624,15 @@ void __cpuinit gic_secondary_init(unsigned int gic_nr) gic_cpu_init(&gic_data[gic_nr]); } -void __cpuinit gic_enable_ppi(unsigned int irq) -{ - unsigned long flags; - - local_irq_save(flags); - irq_set_status_flags(irq, IRQ_NOPROBE); - gic_unmask_irq(irq_get_irq_data(irq)); - local_irq_restore(flags); -} - #ifdef CONFIG_SMP void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) { - unsigned long map = *cpus_addr(*mask); + 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 @@ -394,3 +644,35 @@ void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) writel_relaxed(map << 16 | irq, gic_data[0].dist_base + GIC_DIST_SOFTINT); } #endif + +#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; + int irq; + struct irq_domain *domain = &gic_data[gic_cnt].domain; + + 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"); + + domain->of_node = of_node_get(node); + + gic_init(gic_cnt, -1, dist_base, cpu_base); + + if (parent) { + irq = irq_of_parse_and_map(node, 0); + gic_cascade_irq(gic_cnt, irq); + } + gic_cnt++; + return 0; +} +#endif |