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(struct irq_data *data)
34 struct combiner_chip_data *combiner_data =
35 irq_data_get_irq_chip_data(data);
37 return combiner_data->base;
40 static void combiner_mask_irq(struct irq_data *data)
42 u32 mask = 1 << (data->irq % 32);
44 __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
47 static void combiner_unmask_irq(struct irq_data *data)
49 u32 mask = 1 << (data->irq % 32);
51 __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET);
54 static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
56 struct combiner_chip_data *chip_data = get_irq_data(irq);
57 struct irq_chip *chip = get_irq_chip(irq);
58 unsigned int cascade_irq, combiner_irq;
61 /* primary controller ack'ing */
62 chip->irq_ack(&desc->irq_data);
64 spin_lock(&irq_controller_lock);
65 status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
66 spin_unlock(&irq_controller_lock);
71 combiner_irq = __ffs(status);
73 cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
74 if (unlikely(cascade_irq >= NR_IRQS))
75 do_bad_IRQ(cascade_irq, desc);
77 generic_handle_irq(cascade_irq);
80 /* primary controller unmasking */
81 chip->irq_unmask(&desc->irq_data);
84 static struct irq_chip combiner_chip = {
86 .irq_mask = combiner_mask_irq,
87 .irq_unmask = combiner_unmask_irq,
90 void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq)
92 if (combiner_nr >= MAX_COMBINER_NR)
94 if (set_irq_data(irq, &combiner_data[combiner_nr]) != 0)
96 set_irq_chained_handler(irq, combiner_handle_cascade_irq);
99 void __init combiner_init(unsigned int combiner_nr, void __iomem *base,
100 unsigned int irq_start)
104 if (combiner_nr >= MAX_COMBINER_NR)
107 combiner_data[combiner_nr].base = base;
108 combiner_data[combiner_nr].irq_offset = irq_start;
110 /* Disable all interrupts */
112 __raw_writel(0xffffffff, base + COMBINER_ENABLE_CLEAR);
114 /* Setup the Linux IRQ subsystem */
116 for (i = irq_start; i < combiner_data[combiner_nr].irq_offset
117 + MAX_IRQ_IN_COMBINER; i++) {
118 set_irq_chip(i, &combiner_chip);
119 set_irq_chip_data(i, &combiner_data[combiner_nr]);
120 set_irq_handler(i, handle_level_irq);
121 set_irq_flags(i, IRQF_VALID | IRQF_PROBE);