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a900e5d9 RH |
1 | /* |
2 | * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd. | |
3 | * http://www.samsung.com | |
4 | * | |
5 | * Combiner irqchip for EXYNOS | |
6 | * | |
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. | |
10 | */ | |
11 | #include <linux/err.h> | |
12 | #include <linux/export.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/irqdomain.h> | |
16 | #include <linux/of_address.h> | |
17 | #include <linux/of_irq.h> | |
18 | #include <asm/mach/irq.h> | |
19 | ||
20 | #include <plat/cpu.h> | |
21 | ||
22 | #include "irqchip.h" | |
23 | ||
24 | #define COMBINER_ENABLE_SET 0x0 | |
25 | #define COMBINER_ENABLE_CLEAR 0x4 | |
26 | #define COMBINER_INT_STATUS 0xC | |
27 | ||
28 | static DEFINE_SPINLOCK(irq_controller_lock); | |
29 | ||
30 | struct combiner_chip_data { | |
31 | unsigned int irq_offset; | |
32 | unsigned int irq_mask; | |
33 | void __iomem *base; | |
df7ef462 | 34 | unsigned int parent_irq; |
a900e5d9 RH |
35 | }; |
36 | ||
37 | static struct irq_domain *combiner_irq_domain; | |
38 | static struct combiner_chip_data combiner_data[MAX_COMBINER_NR]; | |
39 | ||
40 | static inline void __iomem *combiner_base(struct irq_data *data) | |
41 | { | |
42 | struct combiner_chip_data *combiner_data = | |
43 | irq_data_get_irq_chip_data(data); | |
44 | ||
45 | return combiner_data->base; | |
46 | } | |
47 | ||
48 | static void combiner_mask_irq(struct irq_data *data) | |
49 | { | |
50 | u32 mask = 1 << (data->hwirq % 32); | |
51 | ||
52 | __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR); | |
53 | } | |
54 | ||
55 | static void combiner_unmask_irq(struct irq_data *data) | |
56 | { | |
57 | u32 mask = 1 << (data->hwirq % 32); | |
58 | ||
59 | __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET); | |
60 | } | |
61 | ||
62 | static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) | |
63 | { | |
64 | struct combiner_chip_data *chip_data = irq_get_handler_data(irq); | |
65 | struct irq_chip *chip = irq_get_chip(irq); | |
66 | unsigned int cascade_irq, combiner_irq; | |
67 | unsigned long status; | |
68 | ||
69 | chained_irq_enter(chip, desc); | |
70 | ||
71 | spin_lock(&irq_controller_lock); | |
72 | status = __raw_readl(chip_data->base + COMBINER_INT_STATUS); | |
73 | spin_unlock(&irq_controller_lock); | |
74 | status &= chip_data->irq_mask; | |
75 | ||
76 | if (status == 0) | |
77 | goto out; | |
78 | ||
79 | combiner_irq = __ffs(status); | |
80 | ||
81 | cascade_irq = combiner_irq + (chip_data->irq_offset & ~31); | |
82 | if (unlikely(cascade_irq >= NR_IRQS)) | |
83 | do_bad_IRQ(cascade_irq, desc); | |
84 | else | |
85 | generic_handle_irq(cascade_irq); | |
86 | ||
87 | out: | |
88 | chained_irq_exit(chip, desc); | |
89 | } | |
90 | ||
df7ef462 CP |
91 | #ifdef CONFIG_SMP |
92 | static int combiner_set_affinity(struct irq_data *d, | |
93 | const struct cpumask *mask_val, bool force) | |
94 | { | |
95 | struct combiner_chip_data *chip_data = irq_data_get_irq_chip_data(d); | |
96 | struct irq_chip *chip = irq_get_chip(chip_data->parent_irq); | |
97 | struct irq_data *data = irq_get_irq_data(chip_data->parent_irq); | |
98 | ||
99 | if (chip && chip->irq_set_affinity) | |
100 | return chip->irq_set_affinity(data, mask_val, force); | |
101 | else | |
102 | return -EINVAL; | |
103 | } | |
104 | #endif | |
105 | ||
a900e5d9 | 106 | static struct irq_chip combiner_chip = { |
df7ef462 CP |
107 | .name = "COMBINER", |
108 | .irq_mask = combiner_mask_irq, | |
109 | .irq_unmask = combiner_unmask_irq, | |
110 | #ifdef CONFIG_SMP | |
111 | .irq_set_affinity = combiner_set_affinity, | |
112 | #endif | |
a900e5d9 RH |
113 | }; |
114 | ||
115 | static void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq) | |
116 | { | |
117 | unsigned int max_nr; | |
118 | ||
119 | if (soc_is_exynos5250()) | |
120 | max_nr = EXYNOS5_MAX_COMBINER_NR; | |
121 | else | |
122 | max_nr = EXYNOS4_MAX_COMBINER_NR; | |
123 | ||
124 | if (combiner_nr >= max_nr) | |
125 | BUG(); | |
126 | if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0) | |
127 | BUG(); | |
128 | irq_set_chained_handler(irq, combiner_handle_cascade_irq); | |
129 | } | |
130 | ||
131 | static void __init combiner_init_one(unsigned int combiner_nr, | |
df7ef462 | 132 | void __iomem *base, unsigned int irq) |
a900e5d9 RH |
133 | { |
134 | combiner_data[combiner_nr].base = base; | |
135 | combiner_data[combiner_nr].irq_offset = irq_find_mapping( | |
136 | combiner_irq_domain, combiner_nr * MAX_IRQ_IN_COMBINER); | |
137 | combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3); | |
df7ef462 | 138 | combiner_data[combiner_nr].parent_irq = irq; |
a900e5d9 RH |
139 | |
140 | /* Disable all interrupts */ | |
141 | __raw_writel(combiner_data[combiner_nr].irq_mask, | |
142 | base + COMBINER_ENABLE_CLEAR); | |
143 | } | |
144 | ||
145 | #ifdef CONFIG_OF | |
146 | static int combiner_irq_domain_xlate(struct irq_domain *d, | |
147 | struct device_node *controller, | |
148 | const u32 *intspec, unsigned int intsize, | |
149 | unsigned long *out_hwirq, | |
150 | unsigned int *out_type) | |
151 | { | |
152 | if (d->of_node != controller) | |
153 | return -EINVAL; | |
154 | ||
155 | if (intsize < 2) | |
156 | return -EINVAL; | |
157 | ||
158 | *out_hwirq = intspec[0] * MAX_IRQ_IN_COMBINER + intspec[1]; | |
159 | *out_type = 0; | |
160 | ||
161 | return 0; | |
162 | } | |
163 | #else | |
164 | static int combiner_irq_domain_xlate(struct irq_domain *d, | |
165 | struct device_node *controller, | |
166 | const u32 *intspec, unsigned int intsize, | |
167 | unsigned long *out_hwirq, | |
168 | unsigned int *out_type) | |
169 | { | |
170 | return -EINVAL; | |
171 | } | |
172 | #endif | |
173 | ||
174 | static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq, | |
175 | irq_hw_number_t hw) | |
176 | { | |
177 | irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq); | |
178 | irq_set_chip_data(irq, &combiner_data[hw >> 3]); | |
179 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | static struct irq_domain_ops combiner_irq_domain_ops = { | |
185 | .xlate = combiner_irq_domain_xlate, | |
186 | .map = combiner_irq_domain_map, | |
187 | }; | |
188 | ||
189 | void __init combiner_init(void __iomem *combiner_base, | |
190 | struct device_node *np) | |
191 | { | |
192 | int i, irq, irq_base; | |
193 | unsigned int max_nr, nr_irq; | |
194 | ||
195 | if (np) { | |
196 | if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) { | |
197 | pr_warning("%s: number of combiners not specified, " | |
198 | "setting default as %d.\n", | |
199 | __func__, EXYNOS4_MAX_COMBINER_NR); | |
200 | max_nr = EXYNOS4_MAX_COMBINER_NR; | |
201 | } | |
202 | } else { | |
203 | max_nr = soc_is_exynos5250() ? EXYNOS5_MAX_COMBINER_NR : | |
204 | EXYNOS4_MAX_COMBINER_NR; | |
205 | } | |
206 | nr_irq = max_nr * MAX_IRQ_IN_COMBINER; | |
207 | ||
208 | irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0); | |
209 | if (IS_ERR_VALUE(irq_base)) { | |
210 | irq_base = COMBINER_IRQ(0, 0); | |
211 | pr_warning("%s: irq desc alloc failed. Continuing with %d as linux irq base\n", __func__, irq_base); | |
212 | } | |
213 | ||
214 | combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0, | |
215 | &combiner_irq_domain_ops, &combiner_data); | |
216 | if (WARN_ON(!combiner_irq_domain)) { | |
217 | pr_warning("%s: irq domain init failed\n", __func__); | |
218 | return; | |
219 | } | |
220 | ||
221 | for (i = 0; i < max_nr; i++) { | |
a900e5d9 RH |
222 | irq = IRQ_SPI(i); |
223 | #ifdef CONFIG_OF | |
224 | if (np) | |
225 | irq = irq_of_parse_and_map(np, i); | |
226 | #endif | |
df7ef462 | 227 | combiner_init_one(i, combiner_base + (i >> 2) * 0x10, irq); |
a900e5d9 RH |
228 | combiner_cascade_irq(i, irq); |
229 | } | |
230 | } | |
231 | ||
232 | #ifdef CONFIG_OF | |
233 | static int __init combiner_of_init(struct device_node *np, | |
234 | struct device_node *parent) | |
235 | { | |
236 | void __iomem *combiner_base; | |
237 | ||
238 | combiner_base = of_iomap(np, 0); | |
239 | if (!combiner_base) { | |
240 | pr_err("%s: failed to map combiner registers\n", __func__); | |
241 | return -ENXIO; | |
242 | } | |
243 | ||
244 | combiner_init(combiner_base, np); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner", | |
249 | combiner_of_init); | |
250 | #endif |