| /* |
| * 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/slab.h> |
| #include <linux/irqdomain.h> |
| #include <linux/irqchip/chained_irq.h> |
| #include <linux/of_address.h> |
| #include <linux/of_irq.h> |
| #include <asm/mach/irq.h> |
| |
| #include "irqchip.h" |
| |
| #define COMBINER_ENABLE_SET 0x0 |
| #define COMBINER_ENABLE_CLEAR 0x4 |
| #define COMBINER_INT_STATUS 0xC |
| |
| #define IRQ_IN_COMBINER 8 |
| |
| static DEFINE_SPINLOCK(irq_controller_lock); |
| |
| struct combiner_chip_data { |
| unsigned int hwirq_offset; |
| unsigned int irq_mask; |
| void __iomem *base; |
| unsigned int parent_irq; |
| }; |
| |
| static struct irq_domain *combiner_irq_domain; |
| |
| 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); |
| |
| writel_relaxed(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR); |
| } |
| |
| static void combiner_unmask_irq(struct irq_data *data) |
| { |
| u32 mask = 1 << (data->hwirq % 32); |
| |
| writel_relaxed(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 = readl_relaxed(chip_data->base + COMBINER_INT_STATUS); |
| spin_unlock(&irq_controller_lock); |
| status &= chip_data->irq_mask; |
| |
| if (status == 0) |
| goto out; |
| |
| combiner_irq = chip_data->hwirq_offset + __ffs(status); |
| cascade_irq = irq_find_mapping(combiner_irq_domain, combiner_irq); |
| |
| if (unlikely(!cascade_irq)) |
| do_bad_IRQ(irq, desc); |
| else |
| generic_handle_irq(cascade_irq); |
| |
| out: |
| chained_irq_exit(chip, desc); |
| } |
| |
| #ifdef CONFIG_SMP |
| static int combiner_set_affinity(struct irq_data *d, |
| const struct cpumask *mask_val, bool force) |
| { |
| struct combiner_chip_data *chip_data = irq_data_get_irq_chip_data(d); |
| struct irq_chip *chip = irq_get_chip(chip_data->parent_irq); |
| struct irq_data *data = irq_get_irq_data(chip_data->parent_irq); |
| |
| if (chip && chip->irq_set_affinity) |
| return chip->irq_set_affinity(data, mask_val, force); |
| else |
| return -EINVAL; |
| } |
| #endif |
| |
| static struct irq_chip combiner_chip = { |
| .name = "COMBINER", |
| .irq_mask = combiner_mask_irq, |
| .irq_unmask = combiner_unmask_irq, |
| #ifdef CONFIG_SMP |
| .irq_set_affinity = combiner_set_affinity, |
| #endif |
| }; |
| |
| static void __init combiner_cascade_irq(struct combiner_chip_data *combiner_data, |
| unsigned int irq) |
| { |
| if (irq_set_handler_data(irq, combiner_data) != 0) |
| BUG(); |
| irq_set_chained_handler(irq, combiner_handle_cascade_irq); |
| } |
| |
| static void __init combiner_init_one(struct combiner_chip_data *combiner_data, |
| unsigned int combiner_nr, |
| void __iomem *base, unsigned int irq) |
| { |
| combiner_data->base = base; |
| combiner_data->hwirq_offset = (combiner_nr & ~3) * IRQ_IN_COMBINER; |
| combiner_data->irq_mask = 0xff << ((combiner_nr % 4) << 3); |
| combiner_data->parent_irq = irq; |
| |
| /* Disable all interrupts */ |
| writel_relaxed(combiner_data->irq_mask, base + COMBINER_ENABLE_CLEAR); |
| } |
| |
| 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] * IRQ_IN_COMBINER + intspec[1]; |
| *out_type = 0; |
| |
| return 0; |
| } |
| |
| static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq, |
| irq_hw_number_t hw) |
| { |
| struct combiner_chip_data *combiner_data = d->host_data; |
| |
| 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, |
| }; |
| |
| static void __init combiner_init(void __iomem *combiner_base, |
| struct device_node *np, |
| unsigned int max_nr) |
| { |
| int i, irq; |
| unsigned int nr_irq; |
| struct combiner_chip_data *combiner_data; |
| |
| nr_irq = max_nr * IRQ_IN_COMBINER; |
| |
| combiner_data = kcalloc(max_nr, sizeof (*combiner_data), GFP_KERNEL); |
| if (!combiner_data) { |
| pr_warning("%s: could not allocate combiner data\n", __func__); |
| return; |
| } |
| |
| combiner_irq_domain = irq_domain_add_linear(np, nr_irq, |
| &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++) { |
| irq = irq_of_parse_and_map(np, i); |
| |
| combiner_init_one(&combiner_data[i], i, |
| combiner_base + (i >> 2) * 0x10, irq); |
| combiner_cascade_irq(&combiner_data[i], irq); |
| } |
| } |
| |
| static int __init combiner_of_init(struct device_node *np, |
| struct device_node *parent) |
| { |
| void __iomem *combiner_base; |
| unsigned int max_nr = 20; |
| |
| combiner_base = of_iomap(np, 0); |
| if (!combiner_base) { |
| pr_err("%s: failed to map combiner registers\n", __func__); |
| return -ENXIO; |
| } |
| |
| if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) { |
| pr_info("%s: number of combiners not specified, " |
| "setting default as %d.\n", |
| __func__, max_nr); |
| } |
| |
| combiner_init(combiner_base, np, max_nr); |
| |
| return 0; |
| } |
| IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner", |
| combiner_of_init); |