1 /* linux/arch/arm/mach-s5pv310/irq-combiner.c
3 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
6 * Based on arch/arm/common/gic.c
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.
17 #include <asm/mach/irq.h>
19 #define COMBINER_ENABLE_SET 0x0
20 #define COMBINER_ENABLE_CLEAR 0x4
21 #define COMBINER_INT_STATUS 0xC
23 static DEFINE_SPINLOCK(irq_controller_lock);
25 struct combiner_chip_data {
26 unsigned int irq_offset;
30 static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
32 static inline void __iomem *combiner_base(unsigned int irq)
34 struct combiner_chip_data *combiner_data = get_irq_chip_data(irq);
35 return combiner_data->base;
38 static void combiner_mask_irq(unsigned int irq)
40 u32 mask = 1 << (irq % 32);
42 __raw_writel(mask, combiner_base(irq) + COMBINER_ENABLE_CLEAR);
45 static void combiner_unmask_irq(unsigned int irq)
47 u32 mask = 1 << (irq % 32);
49 __raw_writel(mask, combiner_base(irq) + COMBINER_ENABLE_SET);
52 static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
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;
59 /* primary controller ack'ing */
62 spin_lock(&irq_controller_lock);
63 status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
64 spin_unlock(&irq_controller_lock);
69 combiner_irq = __ffs(status);
71 cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
72 if (unlikely(cascade_irq >= NR_IRQS))
73 do_bad_IRQ(cascade_irq, desc);
75 generic_handle_irq(cascade_irq);
78 /* primary controller unmasking */
82 static struct irq_chip combiner_chip = {
84 .mask = combiner_mask_irq,
85 .unmask = combiner_unmask_irq,
88 void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq)
90 if (combiner_nr >= MAX_COMBINER_NR)
92 if (set_irq_data(irq, &combiner_data[combiner_nr]) != 0)
94 set_irq_chained_handler(irq, combiner_handle_cascade_irq);
97 void __init combiner_init(unsigned int combiner_nr, void __iomem *base,
98 unsigned int irq_start)
102 if (combiner_nr >= MAX_COMBINER_NR)
105 combiner_data[combiner_nr].base = base;
106 combiner_data[combiner_nr].irq_offset = irq_start;
108 /* Disable all interrupts */
110 __raw_writel(0xffffffff, base + COMBINER_ENABLE_CLEAR);
112 /* Setup the Linux IRQ subsystem */
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);