git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 84bbc16c CY |
1 | /* linux/arch/arm/mach-s5pv310/irq-combiner.c |
| 2 | * | |
| 3 | * Copyright (c) 2010 Samsung Electronics Co., Ltd. | |
| 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; | |
| 27 | void __iomem *base; | |
| 28 | }; | |
| 29 | ||
| 30 | static struct combiner_chip_data combiner_data[MAX_COMBINER_NR]; | |
| 31 | ||
| 32 | static inline void __iomem *combiner_base(unsigned int irq) | |
| 33 | { | |
| 34 | struct combiner_chip_data *combiner_data = get_irq_chip_data(irq); | |
| 35 | return combiner_data->base; | |
| 36 | } | |
| 37 | ||
| 38 | static void combiner_mask_irq(unsigned int irq) | |
| 39 | { | |
| 40 | u32 mask = 1 << (irq % 32); | |
| 41 | ||
| 42 | __raw_writel(mask, combiner_base(irq) + COMBINER_ENABLE_CLEAR); | |
| 43 | } | |
| 44 | ||
| 45 | static void combiner_unmask_irq(unsigned int irq) | |
| 46 | { | |
| 47 | u32 mask = 1 << (irq % 32); | |
| 48 | ||
| 49 | __raw_writel(mask, combiner_base(irq) + COMBINER_ENABLE_SET); | |
| 50 | } | |
| 51 | ||
| 52 | static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) | |
| 53 | { | |
| 54 | struct combiner_chip_data *chip_data = get_irq_data(irq); | |
| 55 | struct irq_chip *chip = get_irq_chip(irq); | |
| 56 | unsigned int cascade_irq, combiner_irq; | |
| 57 | unsigned long status; | |
| 58 | ||
| 59 | /* primary controller ack'ing */ | |
| 60 | chip->ack(irq); | |
| 61 | ||
| 62 | spin_lock(&irq_controller_lock); | |
| 63 | status = __raw_readl(chip_data->base + COMBINER_INT_STATUS); | |
| 64 | spin_unlock(&irq_controller_lock); | |
| 65 | ||
| 66 | if (status == 0) | |
| 67 | goto out; | |
| 68 | ||
| 0c0f9096 | 69 | combiner_irq = __ffs(status); |
| 84bbc16c CY |
70 | |
| 71 | cascade_irq = combiner_irq + (chip_data->irq_offset & ~31); | |
| 72 | if (unlikely(cascade_irq >= NR_IRQS)) | |
| 73 | do_bad_IRQ(cascade_irq, desc); | |
| 74 | else | |
| 75 | generic_handle_irq(cascade_irq); | |
| 76 | ||
| 77 | out: | |
| 78 | /* primary controller unmasking */ | |
| 79 | chip->unmask(irq); | |
| 80 | } | |
| 81 | ||
| 82 | static struct irq_chip combiner_chip = { | |
| 83 | .name = "COMBINER", | |
| 84 | .mask = combiner_mask_irq, | |
| 85 | .unmask = combiner_unmask_irq, | |
| 86 | }; | |
| 87 | ||
| 88 | void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq) | |
| 89 | { | |
| 90 | if (combiner_nr >= MAX_COMBINER_NR) | |
| 91 | BUG(); | |
| 92 | if (set_irq_data(irq, &combiner_data[combiner_nr]) != 0) | |
| 93 | BUG(); | |
| 94 | set_irq_chained_handler(irq, combiner_handle_cascade_irq); | |
| 95 | } | |
| 96 | ||
| 97 | void __init combiner_init(unsigned int combiner_nr, void __iomem *base, | |
| 98 | unsigned int irq_start) | |
| 99 | { | |
| 100 | unsigned int i; | |
| 101 | ||
| 102 | if (combiner_nr >= MAX_COMBINER_NR) | |
| 103 | BUG(); | |
| 104 | ||
| 105 | combiner_data[combiner_nr].base = base; | |
| 106 | combiner_data[combiner_nr].irq_offset = irq_start; | |
| 107 | ||
| 108 | /* Disable all interrupts */ | |
| 109 | ||
| 110 | __raw_writel(0xffffffff, base + COMBINER_ENABLE_CLEAR); | |
| 111 | ||
| 112 | /* Setup the Linux IRQ subsystem */ | |
| 113 | ||
| 114 | for (i = irq_start; i < combiner_data[combiner_nr].irq_offset | |
| 115 | + MAX_IRQ_IN_COMBINER; i++) { | |
| 116 | set_irq_chip(i, &combiner_chip); | |
| 117 | set_irq_chip_data(i, &combiner_data[combiner_nr]); | |
| 118 | set_irq_handler(i, handle_level_irq); | |
| 119 | set_irq_flags(i, IRQF_VALID | IRQF_PROBE); | |
| 120 | } | |
| 121 | } |