perf kmem: Fix compiles on RHEL6/OL6
[linux/fpc-iii.git] / drivers / irqchip / exynos-combiner.c
blob5945223b73fa2ceba647649e6c16c84fc5447d08
1 /*
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>
14 #include <linux/io.h>
15 #include <linux/slab.h>
16 #include <linux/irqdomain.h>
17 #include <linux/irqchip/chained_irq.h>
18 #include <linux/interrupt.h>
19 #include <linux/of_address.h>
20 #include <linux/of_irq.h>
22 #include "irqchip.h"
24 #define COMBINER_ENABLE_SET 0x0
25 #define COMBINER_ENABLE_CLEAR 0x4
26 #define COMBINER_INT_STATUS 0xC
28 #define IRQ_IN_COMBINER 8
30 static DEFINE_SPINLOCK(irq_controller_lock);
32 struct combiner_chip_data {
33 unsigned int hwirq_offset;
34 unsigned int irq_mask;
35 void __iomem *base;
36 unsigned int parent_irq;
39 static struct irq_domain *combiner_irq_domain;
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;
68 unsigned long status;
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;
77 if (status == 0)
78 goto out;
80 combiner_irq = chip_data->hwirq_offset + __ffs(status);
81 cascade_irq = irq_find_mapping(combiner_irq_domain, combiner_irq);
83 if (unlikely(!cascade_irq))
84 handle_bad_irq(irq, desc);
85 else
86 generic_handle_irq(cascade_irq);
88 out:
89 chained_irq_exit(chip, desc);
92 #ifdef CONFIG_SMP
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);
102 else
103 return -EINVAL;
105 #endif
107 static struct irq_chip combiner_chip = {
108 .name = "COMBINER",
109 .irq_mask = combiner_mask_irq,
110 .irq_unmask = combiner_unmask_irq,
111 #ifdef CONFIG_SMP
112 .irq_set_affinity = combiner_set_affinity,
113 #endif
116 static void __init combiner_cascade_irq(struct combiner_chip_data *combiner_data,
117 unsigned int irq)
119 if (irq_set_handler_data(irq, combiner_data) != 0)
120 BUG();
121 irq_set_chained_handler(irq, combiner_handle_cascade_irq);
124 static void __init combiner_init_one(struct combiner_chip_data *combiner_data,
125 unsigned int combiner_nr,
126 void __iomem *base, unsigned int irq)
128 combiner_data->base = base;
129 combiner_data->hwirq_offset = (combiner_nr & ~3) * IRQ_IN_COMBINER;
130 combiner_data->irq_mask = 0xff << ((combiner_nr % 4) << 3);
131 combiner_data->parent_irq = irq;
133 /* Disable all interrupts */
134 __raw_writel(combiner_data->irq_mask, base + COMBINER_ENABLE_CLEAR);
137 static int combiner_irq_domain_xlate(struct irq_domain *d,
138 struct device_node *controller,
139 const u32 *intspec, unsigned int intsize,
140 unsigned long *out_hwirq,
141 unsigned int *out_type)
143 if (d->of_node != controller)
144 return -EINVAL;
146 if (intsize < 2)
147 return -EINVAL;
149 *out_hwirq = intspec[0] * IRQ_IN_COMBINER + intspec[1];
150 *out_type = 0;
152 return 0;
155 static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
156 irq_hw_number_t hw)
158 struct combiner_chip_data *combiner_data = d->host_data;
160 irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
161 irq_set_chip_data(irq, &combiner_data[hw >> 3]);
162 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
164 return 0;
167 static struct irq_domain_ops combiner_irq_domain_ops = {
168 .xlate = combiner_irq_domain_xlate,
169 .map = combiner_irq_domain_map,
172 static void __init combiner_init(void __iomem *combiner_base,
173 struct device_node *np,
174 unsigned int max_nr)
176 int i, irq;
177 unsigned int nr_irq;
178 struct combiner_chip_data *combiner_data;
180 nr_irq = max_nr * IRQ_IN_COMBINER;
182 combiner_data = kcalloc(max_nr, sizeof (*combiner_data), GFP_KERNEL);
183 if (!combiner_data) {
184 pr_warning("%s: could not allocate combiner data\n", __func__);
185 return;
188 combiner_irq_domain = irq_domain_add_linear(np, nr_irq,
189 &combiner_irq_domain_ops, combiner_data);
190 if (WARN_ON(!combiner_irq_domain)) {
191 pr_warning("%s: irq domain init failed\n", __func__);
192 return;
195 for (i = 0; i < max_nr; i++) {
196 irq = irq_of_parse_and_map(np, i);
198 combiner_init_one(&combiner_data[i], i,
199 combiner_base + (i >> 2) * 0x10, irq);
200 combiner_cascade_irq(&combiner_data[i], irq);
204 static int __init combiner_of_init(struct device_node *np,
205 struct device_node *parent)
207 void __iomem *combiner_base;
208 unsigned int max_nr = 20;
210 combiner_base = of_iomap(np, 0);
211 if (!combiner_base) {
212 pr_err("%s: failed to map combiner registers\n", __func__);
213 return -ENXIO;
216 if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
217 pr_info("%s: number of combiners not specified, "
218 "setting default as %d.\n",
219 __func__, max_nr);
222 combiner_init(combiner_base, np, max_nr);
224 return 0;
226 IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner",
227 combiner_of_init);