2 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
5 * Combiner irqchip for EXYNOS
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #include <linux/err.h>
12 #include <linux/export.h>
13 #include <linux/init.h>
15 #include <linux/irqdomain.h>
16 #include <linux/irqchip/chained_irq.h>
17 #include <linux/of_address.h>
18 #include <linux/of_irq.h>
19 #include <asm/mach/irq.h>
25 #define COMBINER_ENABLE_SET 0x0
26 #define COMBINER_ENABLE_CLEAR 0x4
27 #define COMBINER_INT_STATUS 0xC
29 static DEFINE_SPINLOCK(irq_controller_lock);
31 struct combiner_chip_data {
32 unsigned int irq_offset;
33 unsigned int irq_mask;
35 unsigned int parent_irq;
38 static struct irq_domain *combiner_irq_domain;
39 static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
41 static inline void __iomem *combiner_base(struct irq_data *data)
43 struct combiner_chip_data *combiner_data =
44 irq_data_get_irq_chip_data(data);
46 return combiner_data->base;
49 static void combiner_mask_irq(struct irq_data *data)
51 u32 mask = 1 << (data->hwirq % 32);
53 __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
56 static void combiner_unmask_irq(struct irq_data *data)
58 u32 mask = 1 << (data->hwirq % 32);
60 __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET);
63 static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
65 struct combiner_chip_data *chip_data = irq_get_handler_data(irq);
66 struct irq_chip *chip = irq_get_chip(irq);
67 unsigned int cascade_irq, combiner_irq;
70 chained_irq_enter(chip, desc);
72 spin_lock(&irq_controller_lock);
73 status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
74 spin_unlock(&irq_controller_lock);
75 status &= chip_data->irq_mask;
80 combiner_irq = __ffs(status);
82 cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
83 if (unlikely(cascade_irq >= NR_IRQS))
84 do_bad_IRQ(cascade_irq, desc);
86 generic_handle_irq(cascade_irq);
89 chained_irq_exit(chip, desc);
93 static int combiner_set_affinity(struct irq_data *d,
94 const struct cpumask *mask_val, bool force)
96 struct combiner_chip_data *chip_data = irq_data_get_irq_chip_data(d);
97 struct irq_chip *chip = irq_get_chip(chip_data->parent_irq);
98 struct irq_data *data = irq_get_irq_data(chip_data->parent_irq);
100 if (chip && chip->irq_set_affinity)
101 return chip->irq_set_affinity(data, mask_val, force);
107 static struct irq_chip combiner_chip = {
109 .irq_mask = combiner_mask_irq,
110 .irq_unmask = combiner_unmask_irq,
112 .irq_set_affinity = combiner_set_affinity,
116 static unsigned int max_combiner_nr(void)
118 if (soc_is_exynos5250())
119 return EXYNOS5_MAX_COMBINER_NR;
120 else if (soc_is_exynos4412())
121 return EXYNOS4412_MAX_COMBINER_NR;
122 else if (soc_is_exynos4212())
123 return EXYNOS4212_MAX_COMBINER_NR;
125 return EXYNOS4210_MAX_COMBINER_NR;
128 static void __init combiner_cascade_irq(unsigned int combiner_nr,
131 if (combiner_nr >= max_combiner_nr())
133 if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0)
135 irq_set_chained_handler(irq, combiner_handle_cascade_irq);
138 static void __init combiner_init_one(unsigned int combiner_nr,
139 void __iomem *base, unsigned int irq)
141 combiner_data[combiner_nr].base = base;
142 combiner_data[combiner_nr].irq_offset = irq_find_mapping(
143 combiner_irq_domain, combiner_nr * MAX_IRQ_IN_COMBINER);
144 combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3);
145 combiner_data[combiner_nr].parent_irq = irq;
147 /* Disable all interrupts */
148 __raw_writel(combiner_data[combiner_nr].irq_mask,
149 base + COMBINER_ENABLE_CLEAR);
153 static int combiner_irq_domain_xlate(struct irq_domain *d,
154 struct device_node *controller,
155 const u32 *intspec, unsigned int intsize,
156 unsigned long *out_hwirq,
157 unsigned int *out_type)
159 if (d->of_node != controller)
165 *out_hwirq = intspec[0] * MAX_IRQ_IN_COMBINER + intspec[1];
171 static int combiner_irq_domain_xlate(struct irq_domain *d,
172 struct device_node *controller,
173 const u32 *intspec, unsigned int intsize,
174 unsigned long *out_hwirq,
175 unsigned int *out_type)
181 static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
184 irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
185 irq_set_chip_data(irq, &combiner_data[hw >> 3]);
186 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
191 static struct irq_domain_ops combiner_irq_domain_ops = {
192 .xlate = combiner_irq_domain_xlate,
193 .map = combiner_irq_domain_map,
196 static unsigned int exynos4x12_combiner_extra_irq(int group)
212 void __init combiner_init(void __iomem *combiner_base,
213 struct device_node *np)
215 int i, irq, irq_base;
216 unsigned int max_nr, nr_irq;
218 max_nr = max_combiner_nr();
221 if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
222 pr_info("%s: number of combiners not specified, "
223 "setting default as %d.\n",
228 nr_irq = max_nr * MAX_IRQ_IN_COMBINER;
230 irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0);
231 if (IS_ERR_VALUE(irq_base)) {
232 irq_base = COMBINER_IRQ(0, 0);
233 pr_warning("%s: irq desc alloc failed. Continuing with %d as linux irq base\n", __func__, irq_base);
236 combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0,
237 &combiner_irq_domain_ops, &combiner_data);
238 if (WARN_ON(!combiner_irq_domain)) {
239 pr_warning("%s: irq domain init failed\n", __func__);
243 for (i = 0; i < max_nr; i++) {
244 if (i < EXYNOS4210_MAX_COMBINER_NR || soc_is_exynos5250())
247 irq = exynos4x12_combiner_extra_irq(i);
250 irq = irq_of_parse_and_map(np, i);
252 combiner_init_one(i, combiner_base + (i >> 2) * 0x10, irq);
253 combiner_cascade_irq(i, irq);
258 static int __init combiner_of_init(struct device_node *np,
259 struct device_node *parent)
261 void __iomem *combiner_base;
263 combiner_base = of_iomap(np, 0);
264 if (!combiner_base) {
265 pr_err("%s: failed to map combiner registers\n", __func__);
269 combiner_init(combiner_base, np);
273 IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner",