diff options
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/Kconfig | 27 | ||||
| -rw-r--r-- | drivers/irqchip/Makefile | 9 | ||||
| -rw-r--r-- | drivers/irqchip/exynos-combiner.c | 230 | ||||
| -rw-r--r-- | drivers/irqchip/irq-gic.c | 845 | ||||
| -rw-r--r-- | drivers/irqchip/irq-metag-ext.c | 868 | ||||
| -rw-r--r-- | drivers/irqchip/irq-metag.c | 343 | ||||
| -rw-r--r-- | drivers/irqchip/irq-vic.c | 489 | ||||
| -rw-r--r-- | drivers/irqchip/irqchip.c | 30 | ||||
| -rw-r--r-- | drivers/irqchip/irqchip.h | 29 | ||||
| -rw-r--r-- | drivers/irqchip/spear-shirq.c | 5 |
10 files changed, 2874 insertions, 1 deletions
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 62ca575701d3..a350969e5efe 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -1,3 +1,30 @@ +config IRQCHIP + def_bool y + depends on OF_IRQ + +config ARM_GIC + bool + select IRQ_DOMAIN + select MULTI_IRQ_HANDLER + +config GIC_NON_BANKED + bool + +config ARM_VIC + bool + select IRQ_DOMAIN + select MULTI_IRQ_HANDLER + +config ARM_VIC_NR + int + default 4 if ARCH_S5PV210 + default 3 if ARCH_S5PC100 + default 2 + depends on ARM_VIC + help + The maximum number of VICs available in the system, for + power management. + config VERSATILE_FPGA_IRQ bool select IRQ_DOMAIN diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index bf4609a5bd9d..98e3b87bdf1b 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -1,4 +1,11 @@ +obj-$(CONFIG_IRQCHIP) += irqchip.o + obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o +obj-$(CONFIG_ARCH_EXYNOS) += exynos-combiner.o +obj-$(CONFIG_METAG) += irq-metag-ext.o +obj-$(CONFIG_METAG_PERFCOUNTER_IRQS) += irq-metag.o obj-$(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_ARM_VIC) += irq-vic.o +obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o diff --git a/drivers/irqchip/exynos-combiner.c b/drivers/irqchip/exynos-combiner.c new file mode 100644 index 000000000000..04d86a9803f4 --- /dev/null +++ b/drivers/irqchip/exynos-combiner.c @@ -0,0 +1,230 @@ +/* + * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Combiner irqchip for EXYNOS + * + * 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. + */ +#include <linux/err.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/irqdomain.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <asm/mach/irq.h> + +#include <plat/cpu.h> + +#include "irqchip.h" + +#define COMBINER_ENABLE_SET 0x0 +#define COMBINER_ENABLE_CLEAR 0x4 +#define COMBINER_INT_STATUS 0xC + +static DEFINE_SPINLOCK(irq_controller_lock); + +struct combiner_chip_data { + unsigned int irq_offset; + unsigned int irq_mask; + void __iomem *base; +}; + +static struct irq_domain *combiner_irq_domain; +static struct combiner_chip_data combiner_data[MAX_COMBINER_NR]; + +static inline void __iomem *combiner_base(struct irq_data *data) +{ + struct combiner_chip_data *combiner_data = + irq_data_get_irq_chip_data(data); + + return combiner_data->base; +} + +static void combiner_mask_irq(struct irq_data *data) +{ + u32 mask = 1 << (data->hwirq % 32); + + __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR); +} + +static void combiner_unmask_irq(struct irq_data *data) +{ + u32 mask = 1 << (data->hwirq % 32); + + __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET); +} + +static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) +{ + struct combiner_chip_data *chip_data = irq_get_handler_data(irq); + struct irq_chip *chip = irq_get_chip(irq); + unsigned int cascade_irq, combiner_irq; + unsigned long status; + + chained_irq_enter(chip, desc); + + spin_lock(&irq_controller_lock); + status = __raw_readl(chip_data->base + COMBINER_INT_STATUS); + spin_unlock(&irq_controller_lock); + status &= chip_data->irq_mask; + + if (status == 0) + goto out; + + combiner_irq = __ffs(status); + + cascade_irq = combiner_irq + (chip_data->irq_offset & ~31); + if (unlikely(cascade_irq >= NR_IRQS)) + do_bad_IRQ(cascade_irq, desc); + else + generic_handle_irq(cascade_irq); + + out: + chained_irq_exit(chip, desc); +} + +static struct irq_chip combiner_chip = { + .name = "COMBINER", + .irq_mask = combiner_mask_irq, + .irq_unmask = combiner_unmask_irq, +}; + +static void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq) +{ + unsigned int max_nr; + + if (soc_is_exynos5250()) + max_nr = EXYNOS5_MAX_COMBINER_NR; + else + max_nr = EXYNOS4_MAX_COMBINER_NR; + + if (combiner_nr >= max_nr) + BUG(); + if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0) + BUG(); + irq_set_chained_handler(irq, combiner_handle_cascade_irq); +} + +static void __init combiner_init_one(unsigned int combiner_nr, + void __iomem *base) +{ + combiner_data[combiner_nr].base = base; + combiner_data[combiner_nr].irq_offset = irq_find_mapping( + combiner_irq_domain, combiner_nr * MAX_IRQ_IN_COMBINER); + combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3); + + /* Disable all interrupts */ + __raw_writel(combiner_data[combiner_nr].irq_mask, + base + COMBINER_ENABLE_CLEAR); +} + +#ifdef CONFIG_OF +static int combiner_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 < 2) + return -EINVAL; + + *out_hwirq = intspec[0] * MAX_IRQ_IN_COMBINER + intspec[1]; + *out_type = 0; + + return 0; +} +#else +static int combiner_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) +{ + return -EINVAL; +} +#endif + +static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hw) +{ + irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq); + irq_set_chip_data(irq, &combiner_data[hw >> 3]); + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); + + return 0; +} + +static struct irq_domain_ops combiner_irq_domain_ops = { + .xlate = combiner_irq_domain_xlate, + .map = combiner_irq_domain_map, +}; + +void __init combiner_init(void __iomem *combiner_base, + struct device_node *np) +{ + int i, irq, irq_base; + unsigned int max_nr, nr_irq; + + if (np) { + if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) { + pr_warning("%s: number of combiners not specified, " + "setting default as %d.\n", + __func__, EXYNOS4_MAX_COMBINER_NR); + max_nr = EXYNOS4_MAX_COMBINER_NR; + } + } else { + max_nr = soc_is_exynos5250() ? EXYNOS5_MAX_COMBINER_NR : + EXYNOS4_MAX_COMBINER_NR; + } + nr_irq = max_nr * MAX_IRQ_IN_COMBINER; + + irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0); + if (IS_ERR_VALUE(irq_base)) { + irq_base = COMBINER_IRQ(0, 0); + pr_warning("%s: irq desc alloc failed. Continuing with %d as linux irq base\n", __func__, irq_base); + } + + combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0, + &combiner_irq_domain_ops, &combiner_data); + if (WARN_ON(!combiner_irq_domain)) { + pr_warning("%s: irq domain init failed\n", __func__); + return; + } + + for (i = 0; i < max_nr; i++) { + combiner_init_one(i, combiner_base + (i >> 2) * 0x10); + irq = IRQ_SPI(i); +#ifdef CONFIG_OF + if (np) + irq = irq_of_parse_and_map(np, i); +#endif + combiner_cascade_irq(i, irq); + } +} + +#ifdef CONFIG_OF +static int __init combiner_of_init(struct device_node *np, + struct device_node *parent) +{ + void __iomem *combiner_base; + + combiner_base = of_iomap(np, 0); + if (!combiner_base) { + pr_err("%s: failed to map combiner registers\n", __func__); + return -ENXIO; + } + + combiner_init(combiner_base, np); + + return 0; +} +IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner", + combiner_of_init); +#endif diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c new file mode 100644 index 000000000000..644d72468423 --- /dev/null +++ b/drivers/irqchip/irq-gic.c @@ -0,0 +1,845 @@ +/* + * 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 <linux/irqchip/arm-gic.h> + +#include <asm/irq.h> +#include <asm/exception.h> +#include <asm/smp_plat.h> +#include <asm/mach/irq.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 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 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 = 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); + + /* + * 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 = 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; + + /* + * 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 diff --git a/drivers/irqchip/irq-metag-ext.c b/drivers/irqchip/irq-metag-ext.c new file mode 100644 index 000000000000..92c41ab4dbfd --- /dev/null +++ b/drivers/irqchip/irq-metag-ext.c @@ -0,0 +1,868 @@ +/* + * Meta External interrupt code. + * + * Copyright (C) 2005-2012 Imagination Technologies Ltd. + * + * External interrupts on Meta are configured at two-levels, in the CPU core and + * in the external trigger block. Interrupts from SoC peripherals are + * multiplexed onto a single Meta CPU "trigger" - traditionally it has always + * been trigger 2 (TR2). For info on how de-multiplexing happens check out + * meta_intc_irq_demux(). + */ + +#include <linux/interrupt.h> +#include <linux/irqchip/metag-ext.h> +#include <linux/irqdomain.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/slab.h> +#include <linux/syscore_ops.h> + +#include <asm/irq.h> +#include <asm/hwthread.h> + +#define HWSTAT_STRIDE 8 +#define HWVEC_BLK_STRIDE 0x1000 + +/** + * struct meta_intc_priv - private meta external interrupt data + * @nr_banks: Number of interrupt banks + * @domain: IRQ domain for all banks of external IRQs + * @unmasked: Record of unmasked IRQs + * @levels_altered: Record of altered level bits + */ +struct meta_intc_priv { + unsigned int nr_banks; + struct irq_domain *domain; + + unsigned long unmasked[4]; + +#ifdef CONFIG_METAG_SUSPEND_MEM + unsigned long levels_altered[4]; +#endif +}; + +/* Private data for the one and only external interrupt controller */ +static struct meta_intc_priv meta_intc_priv; + +/** + * meta_intc_offset() - Get the offset into the bank of a hardware IRQ number + * @hw: Hardware IRQ number (within external trigger block) + * + * Returns: Bit offset into the IRQ's bank registers + */ +static unsigned int meta_intc_offset(irq_hw_number_t hw) +{ + return hw & 0x1f; +} + +/** + * meta_intc_bank() - Get the bank number of a hardware IRQ number + * @hw: Hardware IRQ number (within external trigger block) + * + * Returns: Bank number indicating which register the IRQ's bits are + */ +static unsigned int meta_intc_bank(irq_hw_number_t hw) +{ + return hw >> 5; +} + +/** + * meta_intc_stat_addr() - Get the address of a HWSTATEXT register + * @hw: Hardware IRQ number (within external trigger block) + * + * Returns: Address of a HWSTATEXT register containing the status bit for + * the specified hardware IRQ number + */ +static void __iomem *meta_intc_stat_addr(irq_hw_number_t hw) +{ + return (void __iomem *)(HWSTATEXT + + HWSTAT_STRIDE * meta_intc_bank(hw)); +} + +/** + * meta_intc_level_addr() - Get the address of a HWLEVELEXT register + * @hw: Hardware IRQ number (within external trigger block) + * + * Returns: Address of a HWLEVELEXT register containing the sense bit for + * the specified hardware IRQ number + */ +static void __iomem *meta_intc_level_addr(irq_hw_number_t hw) +{ + return (void __iomem *)(HWLEVELEXT + + HWSTAT_STRIDE * meta_intc_bank(hw)); +} + +/** + * meta_intc_mask_addr() - Get the address of a HWMASKEXT register + * @hw: Hardware IRQ number (within external trigger block) + * + * Returns: Address of a HWMASKEXT register containing the mask bit for the + * specified hardware IRQ number + */ +static void __iomem *meta_intc_mask_addr(irq_hw_number_t hw) +{ + return (void __iomem *)(HWMASKEXT + + HWSTAT_STRIDE * meta_intc_bank(hw)); +} + +/** + * meta_intc_vec_addr() - Get the vector address of a hardware interrupt + * @hw: Hardware IRQ number (within external trigger block) + * + * Returns: Address of a HWVECEXT register controlling the core trigger to + * vector the IRQ onto + */ +static inline void __iomem *meta_intc_vec_addr(irq_hw_number_t hw) +{ + return (void __iomem *)(HWVEC0EXT + + HWVEC_BLK_STRIDE * meta_intc_bank(hw) + + HWVECnEXT_STRIDE * meta_intc_offset(hw)); +} + +/** + * meta_intc_startup_irq() - set up an external irq + * @data: data for the external irq to start up + * + * Multiplex interrupts for irq onto TR2. Clear any pending interrupts and + * unmask irq, both using the appropriate callbacks. + */ +static unsigned int meta_intc_startup_irq(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + void __iomem *vec_addr = meta_intc_vec_addr(hw); + int thread = hard_processor_id(); + + /* Perform any necessary acking. */ + if (data->chip->irq_ack) + data->chip->irq_ack(data); + + /* Wire up this interrupt to the core with HWVECxEXT. */ + metag_out32(TBI_TRIG_VEC(TBID_SIGNUM_TR2(thread)), vec_addr); + + /* Perform any necessary unmasking. */ + data->chip->irq_unmask(data); + + return 0; +} + +/** + * meta_intc_shutdown_irq() - turn off an external irq + * @data: data for the external irq to turn off + * + * Mask irq using the appropriate callback and stop muxing it onto TR2. + */ +static void meta_intc_shutdown_irq(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + void __iomem *vec_addr = meta_intc_vec_addr(hw); + + /* Mask the IRQ */ + data->chip->irq_mask(data); + + /* + * Disable the IRQ at the core by removing the interrupt from + * the HW vector mapping. + */ + metag_out32(0, vec_addr); +} + +/** + * meta_intc_ack_irq() - acknowledge an external irq + * @data: data for the external irq to ack + * + * Clear down an edge interrupt in the status register. + */ +static void meta_intc_ack_irq(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + unsigned int bit = 1 << meta_intc_offset(hw); + void __iomem *stat_addr = meta_intc_stat_addr(hw); + + /* Ack the int, if it is still 'on'. + * NOTE - this only works for edge triggered interrupts. + */ + if (metag_in32(stat_addr) & bit) + metag_out32(bit, stat_addr); +} + +/** + * record_irq_is_masked() - record the IRQ masked so it doesn't get handled + * @data: data for the external irq to record + * + * This should get called whenever an external IRQ is masked (by whichever + * callback is used). It records the IRQ masked so that it doesn't get handled + * if it still shows up in the status register. + */ +static void record_irq_is_masked(struct irq_data *data) +{ + struct meta_intc_priv *priv = &meta_intc_priv; + irq_hw_number_t hw = data->hwirq; + + clear_bit(meta_intc_offset(hw), &priv->unmasked[meta_intc_bank(hw)]); +} + +/** + * record_irq_is_unmasked() - record the IRQ unmasked so it can be handled + * @data: data for the external irq to record + * + * This should get called whenever an external IRQ is unmasked (by whichever + * callback is used). It records the IRQ unmasked so that it gets handled if it + * shows up in the status register. + */ +static void record_irq_is_unmasked(struct irq_data *data) +{ + struct meta_intc_priv *priv = &meta_intc_priv; + irq_hw_number_t hw = data->hwirq; + + set_bit(meta_intc_offset(hw), &priv->unmasked[meta_intc_bank(hw)]); +} + +/* + * For use by wrapper IRQ drivers + */ + +/** + * meta_intc_mask_irq_simple() - minimal mask used by wrapper IRQ drivers + * @data: data for the external irq being masked + * + * This should be called by any wrapper IRQ driver mask functions. it doesn't do + * any masking but records the IRQ as masked so that the core code knows the + * mask has taken place. It is the callers responsibility to ensure that the IRQ + * won't trigger an interrupt to the core. + */ +void meta_intc_mask_irq_simple(struct irq_data *data) +{ + record_irq_is_masked(data); +} + +/** + * meta_intc_unmask_irq_simple() - minimal unmask used by wrapper IRQ drivers + * @data: data for the external irq being unmasked + * + * This should be called by any wrapper IRQ driver unmask functions. it doesn't + * do any unmasking but records the IRQ as unmasked so that the core code knows + * the unmask has taken place. It is the callers responsibility to ensure that + * the IRQ can now trigger an interrupt to the core. + */ +void meta_intc_unmask_irq_simple(struct irq_data *data) +{ + record_irq_is_unmasked(data); +} + + +/** + * meta_intc_mask_irq() - mask an external irq using HWMASKEXT + * @data: data for the external irq to mask + * + * This is a default implementation of a mask function which makes use of the + * HWMASKEXT registers available in newer versions. + * + * Earlier versions without these registers should use SoC level IRQ masking + * which call the meta_intc_*_simple() functions above, or if that isn't + * available should use the fallback meta_intc_*_nomask() functions below. + */ +static void meta_intc_mask_irq(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + unsigned int bit = 1 << meta_intc_offset(hw); + void __iomem *mask_addr = meta_intc_mask_addr(hw); + unsigned long flags; + + record_irq_is_masked(data); + + /* update the interrupt mask */ + __global_lock2(flags); + metag_out32(metag_in32(mask_addr) & ~bit, mask_addr); + __global_unlock2(flags); +} + +/** + * meta_intc_unmask_irq() - unmask an external irq using HWMASKEXT + * @data: data for the external irq to unmask + * + * This is a default implementation of an unmask function which makes use of the + * HWMASKEXT registers available on new versions. It should be paired with + * meta_intc_mask_irq() above. + */ +static void meta_intc_unmask_irq(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + unsigned int bit = 1 << meta_intc_offset(hw); + void __iomem *mask_addr = meta_intc_mask_addr(hw); + unsigned long flags; + + record_irq_is_unmasked(data); + + /* update the interrupt mask */ + __global_lock2(flags); + metag_out32(metag_in32(mask_addr) | bit, mask_addr); + __global_unlock2(flags); +} + +/** + * meta_intc_mask_irq_nomask() - mask an external irq by unvectoring + * @data: data for the external irq to mask + * + * This is the version of the mask function for older versions which don't have + * HWMASKEXT registers, or a SoC level means of masking IRQs. Instead the IRQ is + * unvectored from the core and retriggered if necessary later. + */ +static void meta_intc_mask_irq_nomask(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + void __iomem *vec_addr = meta_intc_vec_addr(hw); + + record_irq_is_masked(data); + + /* there is no interrupt mask, so unvector the interrupt */ + metag_out32(0, vec_addr); +} + +/** + * meta_intc_unmask_edge_irq_nomask() - unmask an edge irq by revectoring + * @data: data for the external irq to unmask + * + * This is the version of the unmask function for older versions which don't + * have HWMASKEXT registers, or a SoC level means of masking IRQs. Instead the + * IRQ is revectored back to the core and retriggered if necessary. + * + * The retriggering done by this function is specific to edge interrupts. + */ +static void meta_intc_unmask_edge_irq_nomask(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + unsigned int bit = 1 << meta_intc_offset(hw); + void __iomem *stat_addr = meta_intc_stat_addr(hw); + void __iomem *vec_addr = meta_intc_vec_addr(hw); + unsigned int thread = hard_processor_id(); + + record_irq_is_unmasked(data); + + /* there is no interrupt mask, so revector the interrupt */ + metag_out32(TBI_TRIG_VEC(TBID_SIGNUM_TR2(thread)), vec_addr); + + /* + * Re-trigger interrupt + * + * Writing a 1 toggles, and a 0->1 transition triggers. We only + * retrigger if the status bit is already set, which means we + * need to clear it first. Retriggering is fundamentally racy + * because if the interrupt fires again after we clear it we + * could end up clearing it again and the interrupt handler + * thinking it hasn't fired. Therefore we need to keep trying to + * retrigger until the bit is set. + */ + if (metag_in32(stat_addr) & bit) { + metag_out32(bit, stat_addr); + while (!(metag_in32(stat_addr) & bit)) + metag_out32(bit, stat_addr); + } +} + +/** + * meta_intc_unmask_level_irq_nomask() - unmask a level irq by revectoring + * @data: data for the external irq to unmask + * + * This is the version of the unmask function for older versions which don't + * have HWMASKEXT registers, or a SoC level means of masking IRQs. Instead the + * IRQ is revectored back to the core and retriggered if necessary. + * + * The retriggering done by this function is specific to level interrupts. + */ +static void meta_intc_unmask_level_irq_nomask(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + unsigned int bit = 1 << meta_intc_offset(hw); + void __iomem *stat_addr = meta_intc_stat_addr(hw); + void __iomem *vec_addr = meta_intc_vec_addr(hw); + unsigned int thread = hard_processor_id(); + + record_irq_is_unmasked(data); + + /* there is no interrupt mask, so revector the interrupt */ + metag_out32(TBI_TRIG_VEC(TBID_SIGNUM_TR2(thread)), vec_addr); + + /* Re-trigger interrupt */ + /* Writing a 1 triggers interrupt */ + if (metag_in32(stat_addr) & bit) + metag_out32(bit, stat_addr); +} + +/** + * meta_intc_irq_set_type() - set the type of an external irq + * @data: data for the external irq to set the type of + * @flow_type: new irq flow type + * + * Set the flow type of an external interrupt. This updates the irq chip and irq + * handler depending on whether the irq is edge or level sensitive (the polarity + * is ignored), and also sets up the bit in HWLEVELEXT so the hardware knows + * when to trigger. + */ +static int meta_intc_irq_set_type(struct irq_data *data, unsigned int flow_type) +{ +#ifdef CONFIG_METAG_SUSPEND_MEM + struct meta_intc_priv *priv = &meta_intc_priv; +#endif + unsigned int irq = data->irq; + irq_hw_number_t hw = data->hwirq; + unsigned int bit = 1 << meta_intc_offset(hw); + void __iomem *level_addr = meta_intc_level_addr(hw); + unsigned long flags; + unsigned int level; + + /* update the chip/handler */ + if (flow_type & IRQ_TYPE_LEVEL_MASK) + __irq_set_chip_handler_name_locked(irq, &meta_intc_level_chip, + handle_level_irq, NULL); + else + __irq_set_chip_handler_name_locked(irq, &meta_intc_edge_chip, + handle_edge_irq, NULL); + + /* and clear/set the bit in HWLEVELEXT */ + __global_lock2(flags); + level = metag_in32(level_addr); + if (flow_type & IRQ_TYPE_LEVEL_MASK) + level |= bit; + else + level &= ~bit; + metag_out32(level, level_addr); +#ifdef CONFIG_METAG_SUSPEND_MEM + priv->levels_altered[meta_intc_bank(hw)] |= bit; +#endif + __global_unlock2(flags); + + return 0; +} + +/** + * meta_intc_irq_demux() - external irq de-multiplexer + * @irq: the virtual interrupt number + * @desc: the interrupt description structure for this irq + * + * The cpu receives an interrupt on TR2 when a SoC interrupt has occurred. It is + * this function's job to demux this irq and figure out exactly which external + * irq needs servicing. + * + * Whilst using TR2 to detect external interrupts is a software convention it is + * (hopefully) unlikely to change. + */ +static void meta_intc_irq_demux(unsigned int irq, struct irq_desc *desc) +{ + struct meta_intc_priv *priv = &meta_intc_priv; + irq_hw_number_t hw; + unsigned int bank, irq_no, status; + void __iomem *stat_addr = meta_intc_stat_addr(0); + + /* + * Locate which interrupt has caused our handler to run. + */ + for (bank = 0; bank < priv->nr_banks; ++bank) { + /* Which interrupts are currently pending in this bank? */ +recalculate: + status = metag_in32(stat_addr) & priv->unmasked[bank]; + + for (hw = bank*32; status; status >>= 1, ++hw) { + if (status & 0x1) { + /* + * Map the hardware IRQ number to a virtual + * Linux IRQ number. + */ + irq_no = irq_linear_revmap(priv->domain, hw); + + /* + * Only fire off external interrupts that are + * registered to be handled by the kernel. + * Other external interrupts are probably being + * handled by other Meta hardware threads. + */ + generic_handle_irq(irq_no); + + /* + * The handler may have re-enabled interrupts + * which could have caused a nested invocation + * of this code and make the copy of the + * status register we are using invalid. + */ + goto recalculate; + } + } + stat_addr += HWSTAT_STRIDE; + } +} + +#ifdef CONFIG_SMP +/** + * meta_intc_set_affinity() - set the affinity for an interrupt + * @data: data for the external irq to set the affinity of + * @cpumask: cpu mask representing cpus which can handle the interrupt + * @force: whether to force (ignored) + * + * Revector the specified external irq onto a specific cpu's TR2 trigger, so + * that that cpu tends to be the one who handles it. + */ +static int meta_intc_set_affinity(struct irq_data *data, + const struct cpumask *cpumask, bool force) +{ + irq_hw_number_t hw = data->hwirq; + void __iomem *vec_addr = meta_intc_vec_addr(hw); + unsigned int cpu, thread; + + /* + * Wire up this interrupt from HWVECxEXT to the Meta core. + * + * Note that we can't wire up HWVECxEXT to interrupt more than + * one cpu (the interrupt code doesn't support it), so we just + * pick the first cpu we find in 'cpumask'. + */ + cpu = cpumask_any(cpumask); + thread = cpu_2_hwthread_id[cpu]; + + metag_out32(TBI_TRIG_VEC(TBID_SIGNUM_TR2(thread)), vec_addr); + + return 0; +} +#else +#define meta_intc_set_affinity NULL +#endif + +#ifdef CONFIG_PM_SLEEP +#define META_INTC_CHIP_FLAGS (IRQCHIP_MASK_ON_SUSPEND \ + | IRQCHIP_SKIP_SET_WAKE) +#else +#define META_INTC_CHIP_FLAGS 0 +#endif + +/* public edge/level irq chips which SoCs can override */ + +struct irq_chip meta_intc_edge_chip = { + .irq_startup = meta_intc_startup_irq, + .irq_shutdown = meta_intc_shutdown_irq, + .irq_ack = meta_intc_ack_irq, + .irq_mask = meta_intc_mask_irq, + .irq_unmask = meta_intc_unmask_irq, + .irq_set_type = meta_intc_irq_set_type, + .irq_set_affinity = meta_intc_set_affinity, + .flags = META_INTC_CHIP_FLAGS, +}; + +struct irq_chip meta_intc_level_chip = { + .irq_startup = meta_intc_startup_irq, + .irq_shutdown = meta_intc_shutdown_irq, + .irq_set_type = meta_intc_irq_set_type, + .irq_mask = meta_intc_mask_irq, + .irq_unmask = meta_intc_unmask_irq, + .irq_set_affinity = meta_intc_set_affinity, + .flags = META_INTC_CHIP_FLAGS, +}; + +/** + * meta_intc_map() - map an external irq + * @d: irq domain of external trigger block + * @irq: virtual irq number + * @hw: hardware irq number within external trigger block + * + * This sets up a virtual irq for a specified hardware interrupt. The irq chip + * and handler is configured, using the HWLEVELEXT registers to determine + * edge/level flow type. These registers will have been set when the irq type is + * set (or set to a default at init time). + */ +static int meta_intc_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hw) +{ + unsigned int bit = 1 << meta_intc_offset(hw); + void __iomem *level_addr = meta_intc_level_addr(hw); + + /* Go by the current sense in the HWLEVELEXT register */ + if (metag_in32(level_addr) & bit) + irq_set_chip_and_handler(irq, &meta_intc_level_chip, + handle_level_irq); + else + irq_set_chip_and_handler(irq, &meta_intc_edge_chip, + handle_edge_irq); + return 0; +} + +static const struct irq_domain_ops meta_intc_domain_ops = { + .map = meta_intc_map, + .xlate = irq_domain_xlate_twocell, +}; + +#ifdef CONFIG_METAG_SUSPEND_MEM + +/** + * struct meta_intc_context - suspend context + * @levels: State of HWLEVELEXT registers + * @masks: State of HWMASKEXT registers + * @vectors: State of HWVECEXT registers + * @txvecint: State of TxVECINT registers + * + * This structure stores the IRQ state across suspend. + */ +struct meta_intc_context { + u32 levels[4]; + u32 masks[4]; + u8 vectors[4*32]; + + u8 txvecint[4][4]; +}; + +/* suspend context */ +static struct meta_intc_context *meta_intc_context; + +/** + * meta_intc_suspend() - store irq state + * + * To avoid interfering with other threads we only save the IRQ state of IRQs in + * use by Linux. + */ +static int meta_intc_suspend(void) +{ + struct meta_intc_priv *priv = &meta_intc_priv; + int i, j; + irq_hw_number_t hw; + unsigned int bank; + unsigned long flags; + struct meta_intc_context *context; + void __iomem *level_addr, *mask_addr, *vec_addr; + u32 mask, bit; + + context = kzalloc(sizeof(*context), GFP_ATOMIC); + if (!context) + return -ENOMEM; + + hw = 0; + level_addr = meta_intc_level_addr(0); + mask_addr = meta_intc_mask_addr(0); + for (bank = 0; bank < priv->nr_banks; ++bank) { + vec_addr = meta_intc_vec_addr(hw); + + /* create mask of interrupts in use */ + mask = 0; + for (bit = 1; bit; bit <<= 1) { + i = irq_linear_revmap(priv->domain, hw); + /* save mapped irqs which are enabled or have actions */ + if (i && (!irqd_irq_disabled(irq_get_irq_data(i)) || + irq_has_action(i))) { + mask |= bit; + + /* save trigger vector */ + context->vectors[hw] = metag_in32(vec_addr); + } + + ++hw; + vec_addr += HWVECnEXT_STRIDE; + } + + /* save level state if any IRQ levels altered */ + if (priv->levels_altered[bank]) + context->levels[bank] = metag_in32(level_addr); + /* save mask state if any IRQs in use */ + if (mask) + context->masks[bank] = metag_in32(mask_addr); + + level_addr += HWSTAT_STRIDE; + mask_addr += HWSTAT_STRIDE; + } + + /* save trigger matrixing */ + __global_lock2(flags); + for (i = 0; i < 4; ++i) + for (j = 0; j < 4; ++j) + context->txvecint[i][j] = metag_in32(T0VECINT_BHALT + + TnVECINT_STRIDE*i + + 8*j); + __global_unlock2(flags); + + meta_intc_context = context; + return 0; +} + +/** + * meta_intc_resume() - restore saved irq state + * + * Restore the saved IRQ state and drop it. + */ +static void meta_intc_resume(void) +{ + struct meta_intc_priv *priv = &meta_intc_priv; + int i, j; + irq_hw_number_t hw; + unsigned int bank; + unsigned long flags; + struct meta_intc_context *context = meta_intc_context; + void __iomem *level_addr, *mask_addr, *vec_addr; + u32 mask, bit, tmp; + + meta_intc_context = NULL; + + hw = 0; + level_addr = meta_intc_level_addr(0); + mask_addr = meta_intc_mask_addr(0); + for (bank = 0; bank < priv->nr_banks; ++bank) { + vec_addr = meta_intc_vec_addr(hw); + + /* create mask of interrupts in use */ + mask = 0; + for (bit = 1; bit; bit <<= 1) { + i = irq_linear_revmap(priv->domain, hw); + /* restore mapped irqs, enabled or with actions */ + if (i && (!irqd_irq_disabled(irq_get_irq_data(i)) || + irq_has_action(i))) { + mask |= bit; + + /* restore trigger vector */ + metag_out32(context->vectors[hw], vec_addr); + } + + ++hw; + vec_addr += HWVECnEXT_STRIDE; + } + + if (mask) { + /* restore mask state */ + __global_lock2(flags); + tmp = metag_in32(mask_addr); + tmp = (tmp & ~mask) | (context->masks[bank] & mask); + metag_out32(tmp, mask_addr); + __global_unlock2(flags); + } + + mask = priv->levels_altered[bank]; + if (mask) { + /* restore level state */ + __global_lock2(flags); + tmp = metag_in32(level_addr); + tmp = (tmp & ~mask) | (context->levels[bank] & mask); + metag_out32(tmp, level_addr); + __global_unlock2(flags); + } + + level_addr += HWSTAT_STRIDE; + mask_addr += HWSTAT_STRIDE; + } + + /* restore trigger matrixing */ + __global_lock2(flags); + for (i = 0; i < 4; ++i) { + for (j = 0; j < 4; ++j) { + metag_out32(context->txvecint[i][j], + T0VECINT_BHALT + + TnVECINT_STRIDE*i + + 8*j); + } + } + __global_unlock2(flags); + + kfree(context); +} + +static struct syscore_ops meta_intc_syscore_ops = { + .suspend = meta_intc_suspend, + .resume = meta_intc_resume, +}; + +static void __init meta_intc_init_syscore_ops(struct meta_intc_priv *priv) +{ + register_syscore_ops(&meta_intc_syscore_ops); +} +#else +#define meta_intc_init_syscore_ops(priv) do {} while (0) +#endif + +/** + * meta_intc_init_cpu() - register with a Meta cpu + * @priv: private interrupt controller data + * @cpu: the CPU to register on + * + * Configure @cpu's TR2 irq so that we can demux external irqs. + */ +static void __init meta_intc_init_cpu(struct meta_intc_priv *priv, int cpu) +{ + unsigned int thread = cpu_2_hwthread_id[cpu]; + unsigned int signum = TBID_SIGNUM_TR2(thread); + int irq = tbisig_map(signum); + + /* Register the multiplexed IRQ handler */ + irq_set_chained_handler(irq, meta_intc_irq_demux); + irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW); +} + +/** + * meta_intc_no_mask() - indicate lack of HWMASKEXT registers + * + * Called from SoC code (or init code below) to dynamically indicate the lack of + * HWMASKEXT registers (for example depending on some SoC revision register). + * This alters the irq mask and unmask callbacks to use the fallback + * unvectoring/retriggering technique instead of using HWMASKEXT registers. + */ +void __init meta_intc_no_mask(void) +{ + meta_intc_edge_chip.irq_mask = meta_intc_mask_irq_nomask; + meta_intc_edge_chip.irq_unmask = meta_intc_unmask_edge_irq_nomask; + meta_intc_level_chip.irq_mask = meta_intc_mask_irq_nomask; + meta_intc_level_chip.irq_unmask = meta_intc_unmask_level_irq_nomask; +} + +/** + * init_external_IRQ() - initialise the external irq controller + * + * Set up the external irq controller using device tree properties. This is + * called from init_IRQ(). + */ +int __init init_external_IRQ(void) +{ + struct meta_intc_priv *priv = &meta_intc_priv; + struct device_node *node; + int ret, cpu; + u32 val; + bool no_masks = false; + + node = of_find_compatible_node(NULL, NULL, "img,meta-intc"); + if (!node) + return -ENOENT; + + /* Get number of banks */ + ret = of_property_read_u32(node, "num-banks", &val); + if (ret) { + pr_err("meta-intc: No num-banks property found\n"); + return ret; + } + if (val < 1 || val > 4) { + pr_err("meta-intc: num-banks (%u) out of range\n", val); + return -EINVAL; + } + priv->nr_banks = val; + + /* Are any mask registers present? */ + if (of_get_property(node, "no-mask", NULL)) + no_masks = true; + + /* No HWMASKEXT registers present? */ + if (no_masks) + meta_intc_no_mask(); + + /* Set up an IRQ domain */ + /* + * This is a legacy IRQ domain for now until all the platform setup code + * has been converted to devicetree. + */ + priv->domain = irq_domain_add_linear(node, priv->nr_banks*32, + &meta_intc_domain_ops, priv); + if (unlikely(!priv->domain)) { + pr_err("meta-intc: cannot add IRQ domain\n"); + return -ENOMEM; + } + + /* Setup TR2 for all cpus. */ + for_each_possible_cpu(cpu) + meta_intc_init_cpu(priv, cpu); + + /* Set up system suspend/resume callbacks */ + meta_intc_init_syscore_ops(priv); + + pr_info("meta-intc: External IRQ controller initialised (%u IRQs)\n", + priv->nr_banks*32); + + return 0; +} diff --git a/drivers/irqchip/irq-metag.c b/drivers/irqchip/irq-metag.c new file mode 100644 index 000000000000..8e94d7a3b20d --- /dev/null +++ b/drivers/irqchip/irq-metag.c @@ -0,0 +1,343 @@ +/* + * Meta internal (HWSTATMETA) interrupt code. + * + * Copyright (C) 2011-2012 Imagination Technologies Ltd. + * + * This code is based on the code in SoC/common/irq.c and SoC/comet/irq.c + * The code base could be generalised/merged as a lot of the functionality is + * similar. Until this is done, we try to keep the code simple here. + */ + +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irqdomain.h> + +#include <asm/irq.h> +#include <asm/hwthread.h> + +#define PERF0VECINT 0x04820580 +#define PERF1VECINT 0x04820588 +#define PERF0TRIG_OFFSET 16 +#define PERF1TRIG_OFFSET 17 + +/** + * struct metag_internal_irq_priv - private meta internal interrupt data + * @domain: IRQ domain for all internal Meta IRQs (HWSTATMETA) + * @unmasked: Record of unmasked IRQs + */ +struct metag_internal_irq_priv { + struct irq_domain *domain; + + unsigned long unmasked; +}; + +/* Private data for the one and only internal interrupt controller */ +static struct metag_internal_irq_priv metag_internal_irq_priv; + +static unsigned int metag_internal_irq_startup(struct irq_data *data); +static void metag_internal_irq_shutdown(struct irq_data *data); +static void metag_internal_irq_ack(struct irq_data *data); +static void metag_internal_irq_mask(struct irq_data *data); +static void metag_internal_irq_unmask(struct irq_data *data); +#ifdef CONFIG_SMP +static int metag_internal_irq_set_affinity(struct irq_data *data, + const struct cpumask *cpumask, bool force); +#endif + +static struct irq_chip internal_irq_edge_chip = { + .name = "HWSTATMETA-IRQ", + .irq_startup = metag_internal_irq_startup, + .irq_shutdown = metag_internal_irq_shutdown, + .irq_ack = metag_internal_irq_ack, + .irq_mask = metag_internal_irq_mask, + .irq_unmask = metag_internal_irq_unmask, +#ifdef CONFIG_SMP + .irq_set_affinity = metag_internal_irq_set_affinity, +#endif +}; + +/* + * metag_hwvec_addr - get the address of *VECINT regs of irq + * + * This function is a table of supported triggers on HWSTATMETA + * Could do with a structure, but better keep it simple. Changes + * in this code should be rare. + */ +static inline void __iomem *metag_hwvec_addr(irq_hw_number_t hw) +{ + void __iomem *addr; + + switch (hw) { + case PERF0TRIG_OFFSET: + addr = (void __iomem *)PERF0VECINT; + break; + case PERF1TRIG_OFFSET: + addr = (void __iomem *)PERF1VECINT; + break; + default: + addr = NULL; + break; + } + return addr; +} + +/* + * metag_internal_startup - setup an internal irq + * @irq: the irq to startup + * + * Multiplex interrupts for @irq onto TR1. Clear any pending + * interrupts. + */ +static unsigned int metag_internal_irq_startup(struct irq_data *data) +{ + /* Clear (toggle) the bit in HWSTATMETA for our interrupt. */ + metag_internal_irq_ack(data); + + /* Enable the interrupt by unmasking it */ + metag_internal_irq_unmask(data); + + return 0; +} + +/* + * metag_internal_irq_shutdown - turn off the irq + * @irq: the irq number to turn off + * + * Mask @irq and clear any pending interrupts. + * Stop muxing @irq onto TR1. + */ +static void metag_internal_irq_shutdown(struct irq_data *data) +{ + /* Disable the IRQ at the core by masking it. */ + metag_internal_irq_mask(data); + + /* Clear (toggle) the bit in HWSTATMETA for our interrupt. */ + metag_internal_irq_ack(data); +} + +/* + * metag_internal_irq_ack - acknowledge irq + * @irq: the irq to ack + */ +static void metag_internal_irq_ack(struct irq_data *data) +{ + irq_hw_number_t hw = data->hwirq; + unsigned int bit = 1 << hw; + + if (metag_in32(HWSTATMETA) & bit) + metag_out32(bit, HWSTATMETA); +} + +/** + * metag_internal_irq_mask() - mask an internal irq by unvectoring + * @data: data for the internal irq to mask + * + * HWSTATMETA has no mask register. Instead the IRQ is unvectored from the core + * and retriggered if necessary later. + */ +static void metag_internal_irq_mask(struct irq_data *data) +{ + struct metag_internal_irq_priv *priv = &metag_internal_irq_priv; + irq_hw_number_t hw = data->hwirq; + void __iomem *vec_addr = metag_hwvec_addr(hw); + + clear_bit(hw, &priv->unmasked); + + /* there is no interrupt mask, so unvector the interrupt */ + metag_out32(0, vec_addr); +} + +/** + * meta_intc_unmask_edge_irq_nomask() - unmask an edge irq by revectoring + * @data: data for the internal irq to unmask + * + * HWSTATMETA has no mask register. Instead the IRQ is revectored back to the + * core and retriggered if necessary. + */ +static void metag_internal_irq_unmask(struct irq_data *data) +{ + struct metag_internal_irq_priv *priv = &metag_internal_irq_priv; + irq_hw_number_t hw = data->hwirq; + unsigned int bit = 1 << hw; + void __iomem *vec_addr = metag_hwvec_addr(hw); + unsigned int thread = hard_processor_id(); + + set_bit(hw, &priv->unmasked); + + /* there is no interrupt mask, so revector the interrupt */ + metag_out32(TBI_TRIG_VEC(TBID_SIGNUM_TR1(thread)), vec_addr); + + /* + * Re-trigger interrupt + * + * Writing a 1 toggles, and a 0->1 transition triggers. We only + * retrigger if the status bit is already set, which means we + * need to clear it first. Retriggering is fundamentally racy + * because if the interrupt fires again after we clear it we + * could end up clearing it again and the interrupt handler + * thinking it hasn't fired. Therefore we need to keep trying to + * retrigger until the bit is set. + */ + if (metag_in32(HWSTATMETA) & bit) { + metag_out32(bit, HWSTATMETA); + while (!(metag_in32(HWSTATMETA) & bit)) + metag_out32(bit, HWSTATMETA); + } +} + +#ifdef CONFIG_SMP +/* + * metag_internal_irq_set_affinity - set the affinity for an interrupt + */ +static int metag_internal_irq_set_affinity(struct irq_data *data, + const struct cpumask *cpumask, bool force) +{ + unsigned int cpu, thread; + irq_hw_number_t hw = data->hwirq; + /* + * Wire up this interrupt from *VECINT to the Meta core. + * + * Note that we can't wire up *VECINT to interrupt more than + * one cpu (the interrupt code doesn't support it), so we just + * pick the first cpu we find in 'cpumask'. + */ + cpu = cpumask_any(cpumask); + thread = cpu_2_hwthread_id[cpu]; + + metag_out32(TBI_TRIG_VEC(TBID_SIGNUM_TR1(thread)), + metag_hwvec_addr(hw)); + + return 0; +} +#endif + +/* + * metag_internal_irq_demux - irq de-multiplexer + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * + * The cpu receives an interrupt on TR1 when an interrupt has + * occurred. It is this function's job to demux this irq and + * figure out exactly which trigger needs servicing. + */ +static void metag_internal_irq_demux(unsigned int irq, struct irq_desc *desc) +{ + struct metag_internal_irq_priv *priv = irq_desc_get_handler_data(desc); + irq_hw_number_t hw; + unsigned int irq_no; + u32 status; + +recalculate: + status = metag_in32(HWSTATMETA) & priv->unmasked; + + for (hw = 0; status != 0; status >>= 1, ++hw) { + if (status & 0x1) { + /* + * Map the hardware IRQ number to a virtual Linux IRQ + * number. + */ + irq_no = irq_linear_revmap(priv->domain, hw); + + /* + * Only fire off interrupts that are + * registered to be handled by the kernel. + * Other interrupts are probably being + * handled by other Meta hardware threads. + */ + generic_handle_irq(irq_no); + + /* + * The handler may have re-enabled interrupts + * which could have caused a nested invocation + * of this code and make the copy of the + * status register we are using invalid. + */ + goto recalculate; + } + } +} + +/** + * internal_irq_map() - Map an internal meta IRQ to a virtual IRQ number. + * @hw: Number of the internal IRQ. Must be in range. + * + * Returns: The virtual IRQ number of the Meta internal IRQ specified by + * @hw. + */ +int internal_irq_map(unsigned int hw) +{ + struct metag_internal_irq_priv *priv = &metag_internal_irq_priv; + if (!priv->domain) + return -ENODEV; + return irq_create_mapping(priv->domain, hw); +} + +/** + * metag_internal_irq_init_cpu - regsister with the Meta cpu + * @cpu: the CPU to register on + * + * Configure @cpu's TR1 irq so that we can demux irqs. + */ +static void metag_internal_irq_init_cpu(struct metag_internal_irq_priv *priv, + int cpu) +{ + unsigned int thread = cpu_2_hwthread_id[cpu]; + unsigned int signum = TBID_SIGNUM_TR1(thread); + int irq = tbisig_map(signum); + + /* Register the multiplexed IRQ handler */ + irq_set_handler_data(irq, priv); + irq_set_chained_handler(irq, metag_internal_irq_demux); + irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW); +} + +/** + * metag_internal_intc_map() - map an internal irq + * @d: irq domain of internal trigger block + * @irq: virtual irq number + * @hw: hardware irq number within internal trigger block + * + * This sets up a virtual irq for a specified hardware interrupt. The irq chip + * and handler is configured. + */ +static int metag_internal_intc_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hw) +{ + /* only register interrupt if it is mapped */ + if (!metag_hwvec_addr(hw)) + return -EINVAL; + + irq_set_chip_and_handler(irq, &internal_irq_edge_chip, + handle_edge_irq); + return 0; +} + +static const struct irq_domain_ops metag_internal_intc_domain_ops = { + .map = metag_internal_intc_map, +}; + +/** + * metag_internal_irq_register - register internal IRQs + * + * Register the irq chip and handler function for all internal IRQs + */ +int __init init_internal_IRQ(void) +{ + struct metag_internal_irq_priv *priv = &metag_internal_irq_priv; + unsigned int cpu; + + /* Set up an IRQ domain */ + priv->domain = irq_domain_add_linear(NULL, 32, + &metag_internal_intc_domain_ops, + priv); + if (unlikely(!priv->domain)) { + pr_err("meta-internal-intc: cannot add IRQ domain\n"); + return -ENOMEM; + } + + /* Setup TR1 for all cpus. */ + for_each_possible_cpu(cpu) + metag_internal_irq_init_cpu(priv, cpu); + + return 0; +}; diff --git a/drivers/irqchip/irq-vic.c b/drivers/irqchip/irq-vic.c new file mode 100644 index 000000000000..3cf97aaebe40 --- /dev/null +++ b/drivers/irqchip/irq-vic.c @@ -0,0 +1,489 @@ +/* + * linux/arch/arm/common/vic.c + * + * Copyright (C) 1999 - 2003 ARM Limited + * Copyright (C) 2000 Deep Blue Solutions Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/export.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/io.h> +#include <linux/irqdomain.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/syscore_ops.h> +#include <linux/device.h> +#include <linux/amba/bus.h> +#include <linux/irqchip/arm-vic.h> + +#include <asm/exception.h> +#include <asm/mach/irq.h> + +#include "irqchip.h" + +#define VIC_IRQ_STATUS 0x00 +#define VIC_FIQ_STATUS 0x04 +#define VIC_INT_SELECT 0x0c /* 1 = FIQ, 0 = IRQ */ +#define VIC_INT_SOFT 0x18 +#define VIC_INT_SOFT_CLEAR 0x1c +#define VIC_PROTECT 0x20 +#define VIC_PL190_VECT_ADDR 0x30 /* PL190 only */ +#define VIC_PL190_DEF_VECT_ADDR 0x34 /* PL190 only */ + +#define VIC_VECT_ADDR0 0x100 /* 0 to 15 (0..31 PL192) */ +#define VIC_VECT_CNTL0 0x200 /* 0 to 15 (0..31 PL192) */ +#define VIC_ITCR 0x300 /* VIC test control register */ + +#define VIC_VECT_CNTL_ENABLE (1 << 5) + +#define VIC_PL192_VECT_ADDR 0xF00 + +/** + * struct vic_device - VIC PM device + * @irq: The IRQ number for the base of the VIC. + * @base: The register base for the VIC. + * @valid_sources: A bitmask of valid interrupts + * @resume_sources: A bitmask of interrupts for resume. + * @resume_irqs: The IRQs enabled for resume. + * @int_select: Save for VIC_INT_SELECT. + * @int_enable: Save for VIC_INT_ENABLE. + * @soft_int: Save for VIC_INT_SOFT. + * @protect: Save for VIC_PROTECT. + * @domain: The IRQ domain for the VIC. + */ +struct vic_device { + void __iomem *base; + int irq; + u32 valid_sources; + u32 resume_sources; + u32 resume_irqs; + u32 int_select; + u32 int_enable; + u32 soft_int; + u32 protect; + struct irq_domain *domain; +}; + +/* we cannot allocate memory when VICs are initially registered */ +static struct vic_device vic_devices[CONFIG_ARM_VIC_NR]; + +static int vic_id; + +static void vic_handle_irq(struct pt_regs *regs); + +/** + * vic_init2 - common initialisation code + * @base: Base of the VIC. + * + * Common initialisation code for registration + * and resume. +*/ +static void vic_init2(void __iomem *base) +{ + int i; + + for (i = 0; i < 16; i++) { + void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4); + writel(VIC_VECT_CNTL_ENABLE | i, reg); + } + + writel(32, base + VIC_PL190_DEF_VECT_ADDR); +} + +#ifdef CONFIG_PM +static void resume_one_vic(struct vic_device *vic) +{ + void __iomem *base = vic->base; + + printk(KERN_DEBUG "%s: resuming vic at %p\n", __func__, base); + + /* re-initialise static settings */ + vic_init2(base); + + writel(vic->int_select, base + VIC_INT_SELECT); + writel(vic->protect, base + VIC_PROTECT); + + /* set the enabled ints and then clear the non-enabled */ + writel(vic->int_enable, base + VIC_INT_ENABLE); + writel(~vic->int_enable, base + VIC_INT_ENABLE_CLEAR); + + /* and the same for the soft-int register */ + + writel(vic->soft_int, base + VIC_INT_SOFT); + writel(~vic->soft_int, base + VIC_INT_SOFT_CLEAR); +} + +static void vic_resume(void) +{ + int id; + + for (id = vic_id - 1; id >= 0; id--) + resume_one_vic(vic_devices + id); +} + +static void suspend_one_vic(struct vic_device *vic) +{ + void __iomem *base = vic->base; + + printk(KERN_DEBUG "%s: suspending vic at %p\n", __func__, base); + + vic->int_select = readl(base + VIC_INT_SELECT); + vic->int_enable = readl(base + VIC_INT_ENABLE); + vic->soft_int = readl(base + VIC_INT_SOFT); + vic->protect = readl(base + VIC_PROTECT); + + /* set the interrupts (if any) that are used for + * resuming the system */ + + writel(vic->resume_irqs, base + VIC_INT_ENABLE); + writel(~vic->resume_irqs, base + VIC_INT_ENABLE_CLEAR); +} + +static int vic_suspend(void) +{ + int id; + + for (id = 0; id < vic_id; id++) + suspend_one_vic(vic_devices + id); + + return 0; +} + +struct syscore_ops vic_syscore_ops = { + .suspend = vic_suspend, + .resume = vic_resume, +}; + +/** + * vic_pm_init - initicall to register VIC pm + * + * This is called via late_initcall() to register + * the resources for the VICs due to the early + * nature of the VIC's registration. +*/ +static int __init vic_pm_init(void) +{ + if (vic_id > 0) + register_syscore_ops(&vic_syscore_ops); + + return 0; +} +late_initcall(vic_pm_init); +#endif /* CONFIG_PM */ + +static struct irq_chip vic_chip; + +static int vic_irqdomain_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hwirq) +{ + struct vic_device *v = d->host_data; + + /* Skip invalid IRQs, only register handlers for the real ones */ + if (!(v->valid_sources & (1 << hwirq))) + return -ENOTSUPP; + irq_set_chip_and_handler(irq, &vic_chip, handle_level_irq); + irq_set_chip_data(irq, v->base); + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); + return 0; +} + +/* + * Handle each interrupt in a single VIC. Returns non-zero if we've + * handled at least one interrupt. This reads the status register + * before handling each interrupt, which is necessary given that + * handle_IRQ may briefly re-enable interrupts for soft IRQ handling. + */ +static int handle_one_vic(struct vic_device *vic, struct pt_regs *regs) +{ + u32 stat, irq; + int handled = 0; + + while ((stat = readl_relaxed(vic->base + VIC_IRQ_STATUS))) { + irq = ffs(stat) - 1; + handle_IRQ(irq_find_mapping(vic->domain, irq), regs); + handled = 1; + } + + return handled; +} + +/* + * Keep iterating over all registered VIC's until there are no pending + * interrupts. + */ +static asmlinkage void __exception_irq_entry vic_handle_irq(struct pt_regs *regs) +{ + int i, handled; + + do { + for (i = 0, handled = 0; i < vic_id; ++i) + handled |= handle_one_vic(&vic_devices[i], regs); + } while (handled); +} + +static struct irq_domain_ops vic_irqdomain_ops = { + .map = vic_irqdomain_map, + .xlate = irq_domain_xlate_onetwocell, +}; + +/** + * vic_register() - Register a VIC. + * @base: The base address of the VIC. + * @irq: The base IRQ for the VIC. + * @valid_sources: bitmask of valid interrupts + * @resume_sources: bitmask of interrupts allowed for resume sources. + * @node: The device tree node associated with the VIC. + * + * Register the VIC with the system device tree so that it can be notified + * of suspend and resume requests and ensure that the correct actions are + * taken to re-instate the settings on resume. + * + * This also configures the IRQ domain for the VIC. + */ +static void __init vic_register(void __iomem *base, unsigned int irq, + u32 valid_sources, u32 resume_sources, + struct device_node *node) +{ + struct vic_device *v; + int i; + + if (vic_id >= ARRAY_SIZE(vic_devices)) { + printk(KERN_ERR "%s: too few VICs, increase CONFIG_ARM_VIC_NR\n", __func__); + return; + } + + v = &vic_devices[vic_id]; + v->base = base; + v->valid_sources = valid_sources; + v->resume_sources = resume_sources; + v->irq = irq; + set_handle_irq(vic_handle_irq); + vic_id++; + v->domain = irq_domain_add_simple(node, fls(valid_sources), irq, + &vic_irqdomain_ops, v); + /* create an IRQ mapping for each valid IRQ */ + for (i = 0; i < fls(valid_sources); i++) + if (valid_sources & (1 << i)) + irq_create_mapping(v->domain, i); +} + +static void vic_ack_irq(struct irq_data *d) +{ + void __iomem *base = irq_data_get_irq_chip_data(d); + unsigned int irq = d->hwirq; + writel(1 << irq, base + VIC_INT_ENABLE_CLEAR); + /* moreover, clear the soft-triggered, in case it was the reason */ + writel(1 << irq, base + VIC_INT_SOFT_CLEAR); +} + +static void vic_mask_irq(struct irq_data *d) +{ + void __iomem *base = irq_data_get_irq_chip_data(d); + unsigned int irq = d->hwirq; + writel(1 << irq, base + VIC_INT_ENABLE_CLEAR); +} + +static void vic_unmask_irq(struct irq_data *d) +{ + void __iomem *base = irq_data_get_irq_chip_data(d); + unsigned int irq = d->hwirq; + writel(1 << irq, base + VIC_INT_ENABLE); +} + +#if defined(CONFIG_PM) +static struct vic_device *vic_from_irq(unsigned int irq) +{ + struct vic_device *v = vic_devices; + unsigned int base_irq = irq & ~31; + int id; + + for (id = 0; id < vic_id; id++, v++) { + if (v->irq == base_irq) + return v; + } + + return NULL; +} + +static int vic_set_wake(struct irq_data *d, unsigned int on) +{ + struct vic_device *v = vic_from_irq(d->irq); + unsigned int off = d->hwirq; + u32 bit = 1 << off; + + if (!v) + return -EINVAL; + + if (!(bit & v->resume_sources)) + return -EINVAL; + + if (on) + v->resume_irqs |= bit; + else + v->resume_irqs &= ~bit; + + return 0; +} +#else +#define vic_set_wake NULL +#endif /* CONFIG_PM */ + +static struct irq_chip vic_chip = { + .name = "VIC", + .irq_ack = vic_ack_irq, + .irq_mask = vic_mask_irq, + .irq_unmask = vic_unmask_irq, + .irq_set_wake = vic_set_wake, +}; + +static void __init vic_disable(void __iomem *base) +{ + writel(0, base + VIC_INT_SELECT); + writel(0, base + VIC_INT_ENABLE); + writel(~0, base + VIC_INT_ENABLE_CLEAR); + writel(0, base + VIC_ITCR); + writel(~0, base + VIC_INT_SOFT_CLEAR); +} + +static void __init vic_clear_interrupts(void __iomem *base) +{ + unsigned int i; + + writel(0, base + VIC_PL190_VECT_ADDR); + for (i = 0; i < 19; i++) { + unsigned int value; + + value = readl(base + VIC_PL190_VECT_ADDR); + writel(value, base + VIC_PL190_VECT_ADDR); + } +} + +/* + * The PL190 cell from ARM has been modified by ST to handle 64 interrupts. + * The original cell has 32 interrupts, while the modified one has 64, + * replocating two blocks 0x00..0x1f in 0x20..0x3f. In that case + * the probe function is called twice, with base set to offset 000 + * and 020 within the page. We call this "second block". + */ +static void __init vic_init_st(void __iomem *base, unsigned int irq_start, + u32 vic_sources, struct device_node *node) +{ + unsigned int i; + int vic_2nd_block = ((unsigned long)base & ~PAGE_MASK) != 0; + + /* Disable all interrupts initially. */ + vic_disable(base); + + /* + * Make sure we clear all existing interrupts. The vector registers + * in this cell are after the second block of general registers, + * so we can address them using standard offsets, but only from + * the second base address, which is 0x20 in the page + */ + if (vic_2nd_block) { + vic_clear_interrupts(base); + + /* ST has 16 vectors as well, but we don't enable them by now */ + for (i = 0; i < 16; i++) { + void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4); + writel(0, reg); + } + + writel(32, base + VIC_PL190_DEF_VECT_ADDR); + } + + vic_register(base, irq_start, vic_sources, 0, node); +} + +void __init __vic_init(void __iomem *base, int irq_start, + u32 vic_sources, u32 resume_sources, + struct device_node *node) +{ + unsigned int i; + u32 cellid = 0; + enum amba_vendor vendor; + + /* Identify which VIC cell this one is, by reading the ID */ + for (i = 0; i < 4; i++) { + void __iomem *addr; + addr = (void __iomem *)((u32)base & PAGE_MASK) + 0xfe0 + (i * 4); + cellid |= (readl(addr) & 0xff) << (8 * i); + } + vendor = (cellid >> 12) & 0xff; + printk(KERN_INFO "VIC @%p: id 0x%08x, vendor 0x%02x\n", + base, cellid, vendor); + + switch(vendor) { + case AMBA_VENDOR_ST: + vic_init_st(base, irq_start, vic_sources, node); + return; + default: + printk(KERN_WARNING "VIC: unknown vendor, continuing anyways\n"); + /* fall through */ + case AMBA_VENDOR_ARM: + break; + } + + /* Disable all interrupts initially. */ + vic_disable(base); + + /* Make sure we clear all existing interrupts */ + vic_clear_interrupts(base); + + vic_init2(base); + + vic_register(base, irq_start, vic_sources, resume_sources, node); +} + +/** + * vic_init() - initialise a vectored interrupt controller + * @base: iomem base address + * @irq_start: starting interrupt number, must be muliple of 32 + * @vic_sources: bitmask of interrupt sources to allow + * @resume_sources: bitmask of interrupt sources to allow for resume + */ +void __init vic_init(void __iomem *base, unsigned int irq_start, + u32 vic_sources, u32 resume_sources) +{ + __vic_init(base, irq_start, vic_sources, resume_sources, NULL); +} + +#ifdef CONFIG_OF +int __init vic_of_init(struct device_node *node, struct device_node *parent) +{ + void __iomem *regs; + + if (WARN(parent, "non-root VICs are not supported")) + return -EINVAL; + + regs = of_iomap(node, 0); + if (WARN_ON(!regs)) + return -EIO; + + /* + * Passing 0 as first IRQ makes the simple domain allocate descriptors + */ + __vic_init(regs, 0, ~0, ~0, node); + + return 0; +} +IRQCHIP_DECLARE(arm_pl190_vic, "arm,pl190-vic", vic_of_init); +IRQCHIP_DECLARE(arm_pl192_vic, "arm,pl192-vic", vic_of_init); +IRQCHIP_DECLARE(arm_versatile_vic, "arm,versatile-vic", vic_of_init); +#endif /* CONFIG OF */ diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c new file mode 100644 index 000000000000..f496afce29de --- /dev/null +++ b/drivers/irqchip/irqchip.c @@ -0,0 +1,30 @@ +/* + * Copyright (C) 2012 Thomas Petazzoni + * + * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/init.h> +#include <linux/of_irq.h> + +#include "irqchip.h" + +/* + * This special of_device_id is the sentinel at the end of the + * of_device_id[] array of all irqchips. It is automatically placed at + * the end of the array by the linker, thanks to being part of a + * special section. + */ +static const struct of_device_id +irqchip_of_match_end __used __section(__irqchip_of_end); + +extern struct of_device_id __irqchip_begin[]; + +void __init irqchip_init(void) +{ + of_irq_init(__irqchip_begin); +} diff --git a/drivers/irqchip/irqchip.h b/drivers/irqchip/irqchip.h new file mode 100644 index 000000000000..e445ba2d6add --- /dev/null +++ b/drivers/irqchip/irqchip.h @@ -0,0 +1,29 @@ +/* + * Copyright (C) 2012 Thomas Petazzoni + * + * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#ifndef _IRQCHIP_H +#define _IRQCHIP_H + +/* + * This macro must be used by the different irqchip drivers to declare + * the association between their DT compatible string and their + * initialization function. + * + * @name: name that must be unique accross all IRQCHIP_DECLARE of the + * same file. + * @compstr: compatible string of the irqchip driver + * @fn: initialization function + */ +#define IRQCHIP_DECLARE(name,compstr,fn) \ + static const struct of_device_id irqchip_of_match_##name \ + __used __section(__irqchip_of_table) \ + = { .compatible = compstr, .data = fn } + +#endif diff --git a/drivers/irqchip/spear-shirq.c b/drivers/irqchip/spear-shirq.c index 80e1d2fd9d4c..8527743b5cef 100644 --- a/drivers/irqchip/spear-shirq.c +++ b/drivers/irqchip/spear-shirq.c @@ -25,6 +25,8 @@ #include <linux/of_irq.h> #include <linux/spinlock.h> +#include "irqchip.h" + static DEFINE_SPINLOCK(lock); /* spear300 shared irq registers offsets and masks */ @@ -300,6 +302,7 @@ int __init spear300_shirq_of_init(struct device_node *np, return shirq_init(spear300_shirq_blocks, ARRAY_SIZE(spear300_shirq_blocks), np); } +IRQCHIP_DECLARE(spear300_shirq, "st,spear300-shirq", spear300_shirq_of_init); int __init spear310_shirq_of_init(struct device_node *np, struct device_node *parent) @@ -307,6 +310,7 @@ int __init spear310_shirq_of_init(struct device_node *np, return shirq_init(spear310_shirq_blocks, ARRAY_SIZE(spear310_shirq_blocks), np); } +IRQCHIP_DECLARE(spear310_shirq, "st,spear310-shirq", spear310_shirq_of_init); int __init spear320_shirq_of_init(struct device_node *np, struct device_node *parent) @@ -314,3 +318,4 @@ int __init spear320_shirq_of_init(struct device_node *np, return shirq_init(spear320_shirq_blocks, ARRAY_SIZE(spear320_shirq_blocks), np); } +IRQCHIP_DECLARE(spear320_shirq, "st,spear320-shirq", spear320_shirq_of_init); |