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c81a24ff | 1 | /* linux/arch/arm/mach-exynos4/irq-combiner.c |
84bbc16c | 2 | * |
c81a24ff | 3 | * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd. |
84bbc16c CY |
4 | * http://www.samsung.com |
5 | * | |
6 | * Based on arch/arm/common/gic.c | |
7 | * | |
8 | * IRQ COMBINER support | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/io.h> | |
16 | ||
17 | #include <asm/mach/irq.h> | |
18 | ||
19 | #define COMBINER_ENABLE_SET 0x0 | |
20 | #define COMBINER_ENABLE_CLEAR 0x4 | |
21 | #define COMBINER_INT_STATUS 0xC | |
22 | ||
23 | static DEFINE_SPINLOCK(irq_controller_lock); | |
24 | ||
25 | struct combiner_chip_data { | |
26 | unsigned int irq_offset; | |
85140ad5 | 27 | unsigned int irq_mask; |
84bbc16c CY |
28 | void __iomem *base; |
29 | }; | |
30 | ||
31 | static struct combiner_chip_data combiner_data[MAX_COMBINER_NR]; | |
32 | ||
bb0b2374 | 33 | static inline void __iomem *combiner_base(struct irq_data *data) |
84bbc16c | 34 | { |
bb0b2374 LB |
35 | struct combiner_chip_data *combiner_data = |
36 | irq_data_get_irq_chip_data(data); | |
37 | ||
84bbc16c CY |
38 | return combiner_data->base; |
39 | } | |
40 | ||
bb0b2374 | 41 | static void combiner_mask_irq(struct irq_data *data) |
84bbc16c | 42 | { |
bb0b2374 | 43 | u32 mask = 1 << (data->irq % 32); |
84bbc16c | 44 | |
bb0b2374 | 45 | __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR); |
84bbc16c CY |
46 | } |
47 | ||
bb0b2374 | 48 | static void combiner_unmask_irq(struct irq_data *data) |
84bbc16c | 49 | { |
bb0b2374 | 50 | u32 mask = 1 << (data->irq % 32); |
84bbc16c | 51 | |
bb0b2374 | 52 | __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET); |
84bbc16c CY |
53 | } |
54 | ||
55 | static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) | |
56 | { | |
6845664a TG |
57 | struct combiner_chip_data *chip_data = irq_get_handler_data(irq); |
58 | struct irq_chip *chip = irq_get_chip(irq); | |
84bbc16c CY |
59 | unsigned int cascade_irq, combiner_irq; |
60 | unsigned long status; | |
61 | ||
62 | /* primary controller ack'ing */ | |
bb0b2374 | 63 | chip->irq_ack(&desc->irq_data); |
84bbc16c CY |
64 | |
65 | spin_lock(&irq_controller_lock); | |
66 | status = __raw_readl(chip_data->base + COMBINER_INT_STATUS); | |
67 | spin_unlock(&irq_controller_lock); | |
85140ad5 | 68 | status &= chip_data->irq_mask; |
84bbc16c CY |
69 | |
70 | if (status == 0) | |
71 | goto out; | |
72 | ||
0c0f9096 | 73 | combiner_irq = __ffs(status); |
84bbc16c CY |
74 | |
75 | cascade_irq = combiner_irq + (chip_data->irq_offset & ~31); | |
76 | if (unlikely(cascade_irq >= NR_IRQS)) | |
77 | do_bad_IRQ(cascade_irq, desc); | |
78 | else | |
79 | generic_handle_irq(cascade_irq); | |
80 | ||
81 | out: | |
82 | /* primary controller unmasking */ | |
bb0b2374 | 83 | chip->irq_unmask(&desc->irq_data); |
84bbc16c CY |
84 | } |
85 | ||
86 | static struct irq_chip combiner_chip = { | |
87 | .name = "COMBINER", | |
bb0b2374 LB |
88 | .irq_mask = combiner_mask_irq, |
89 | .irq_unmask = combiner_unmask_irq, | |
84bbc16c CY |
90 | }; |
91 | ||
92 | void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq) | |
93 | { | |
94 | if (combiner_nr >= MAX_COMBINER_NR) | |
95 | BUG(); | |
6845664a | 96 | if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0) |
84bbc16c | 97 | BUG(); |
6845664a | 98 | irq_set_chained_handler(irq, combiner_handle_cascade_irq); |
84bbc16c CY |
99 | } |
100 | ||
101 | void __init combiner_init(unsigned int combiner_nr, void __iomem *base, | |
102 | unsigned int irq_start) | |
103 | { | |
104 | unsigned int i; | |
105 | ||
106 | if (combiner_nr >= MAX_COMBINER_NR) | |
107 | BUG(); | |
108 | ||
109 | combiner_data[combiner_nr].base = base; | |
110 | combiner_data[combiner_nr].irq_offset = irq_start; | |
85140ad5 | 111 | combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3); |
84bbc16c CY |
112 | |
113 | /* Disable all interrupts */ | |
114 | ||
85140ad5 CY |
115 | __raw_writel(combiner_data[combiner_nr].irq_mask, |
116 | base + COMBINER_ENABLE_CLEAR); | |
84bbc16c CY |
117 | |
118 | /* Setup the Linux IRQ subsystem */ | |
119 | ||
120 | for (i = irq_start; i < combiner_data[combiner_nr].irq_offset | |
121 | + MAX_IRQ_IN_COMBINER; i++) { | |
6845664a | 122 | irq_set_chip(i, &combiner_chip); |
6845664a | 123 | irq_set_handler(i, handle_level_irq); |
9323f261 | 124 | irq_set_chip_data(i, &combiner_data[combiner_nr]); |
84bbc16c CY |
125 | set_irq_flags(i, IRQF_VALID | IRQF_PROBE); |
126 | } | |
127 | } |