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1/*
2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
3 * JZ4740 platform IRQ support
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16#include <linux/errno.h>
17#include <linux/init.h>
18#include <linux/types.h>
19#include <linux/interrupt.h>
20#include <linux/ioport.h>
21#include <linux/irqchip.h>
22#include <linux/irqchip/ingenic.h>
23#include <linux/of_address.h>
24#include <linux/of_irq.h>
25#include <linux/timex.h>
26#include <linux/slab.h>
27#include <linux/delay.h>
28
29#include <asm/io.h>
30#include <asm/mach-jz4740/irq.h>
31
32struct ingenic_intc_data {
33 void __iomem *base;
34 unsigned num_chips;
35};
36
37#define JZ_REG_INTC_STATUS 0x00
38#define JZ_REG_INTC_MASK 0x04
39#define JZ_REG_INTC_SET_MASK 0x08
40#define JZ_REG_INTC_CLEAR_MASK 0x0c
41#define JZ_REG_INTC_PENDING 0x10
42#define CHIP_SIZE 0x20
43
44static irqreturn_t intc_cascade(int irq, void *data)
45{
46 struct ingenic_intc_data *intc = irq_get_handler_data(irq);
47 uint32_t irq_reg;
48 unsigned i;
49
50 for (i = 0; i < intc->num_chips; i++) {
51 irq_reg = readl(intc->base + (i * CHIP_SIZE) +
52 JZ_REG_INTC_PENDING);
53 if (!irq_reg)
54 continue;
55
56 generic_handle_irq(__fls(irq_reg) + (i * 32) + JZ4740_IRQ_BASE);
57 }
58
59 return IRQ_HANDLED;
60}
61
62static void intc_irq_set_mask(struct irq_chip_generic *gc, uint32_t mask)
63{
64 struct irq_chip_regs *regs = &gc->chip_types->regs;
65
66 writel(mask, gc->reg_base + regs->enable);
67 writel(~mask, gc->reg_base + regs->disable);
68}
69
70void ingenic_intc_irq_suspend(struct irq_data *data)
71{
72 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
73 intc_irq_set_mask(gc, gc->wake_active);
74}
75
76void ingenic_intc_irq_resume(struct irq_data *data)
77{
78 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
79 intc_irq_set_mask(gc, gc->mask_cache);
80}
81
82static struct irqaction intc_cascade_action = {
83 .handler = intc_cascade,
84 .name = "SoC intc cascade interrupt",
85};
86
87static int __init ingenic_intc_of_init(struct device_node *node,
88 unsigned num_chips)
89{
90 struct ingenic_intc_data *intc;
91 struct irq_chip_generic *gc;
92 struct irq_chip_type *ct;
93 struct irq_domain *domain;
94 int parent_irq, err = 0;
95 unsigned i;
96
97 intc = kzalloc(sizeof(*intc), GFP_KERNEL);
98 if (!intc) {
99 err = -ENOMEM;
100 goto out_err;
101 }
102
103 parent_irq = irq_of_parse_and_map(node, 0);
104 if (!parent_irq) {
105 err = -EINVAL;
106 goto out_free;
107 }
108
109 err = irq_set_handler_data(parent_irq, intc);
110 if (err)
111 goto out_unmap_irq;
112
113 intc->num_chips = num_chips;
114 intc->base = of_iomap(node, 0);
115 if (!intc->base) {
116 err = -ENODEV;
117 goto out_unmap_irq;
118 }
119
120 for (i = 0; i < num_chips; i++) {
121 /* Mask all irqs */
122 writel(0xffffffff, intc->base + (i * CHIP_SIZE) +
123 JZ_REG_INTC_SET_MASK);
124
125 gc = irq_alloc_generic_chip("INTC", 1,
126 JZ4740_IRQ_BASE + (i * 32),
127 intc->base + (i * CHIP_SIZE),
128 handle_level_irq);
129
130 gc->wake_enabled = IRQ_MSK(32);
131
132 ct = gc->chip_types;
133 ct->regs.enable = JZ_REG_INTC_CLEAR_MASK;
134 ct->regs.disable = JZ_REG_INTC_SET_MASK;
135 ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
136 ct->chip.irq_mask = irq_gc_mask_disable_reg;
137 ct->chip.irq_mask_ack = irq_gc_mask_disable_reg;
138 ct->chip.irq_set_wake = irq_gc_set_wake;
139 ct->chip.irq_suspend = ingenic_intc_irq_suspend;
140 ct->chip.irq_resume = ingenic_intc_irq_resume;
141
142 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, 0,
143 IRQ_NOPROBE | IRQ_LEVEL);
144 }
145
146 domain = irq_domain_add_legacy(node, num_chips * 32, JZ4740_IRQ_BASE, 0,
147 &irq_domain_simple_ops, NULL);
148 if (!domain)
149 pr_warn("unable to register IRQ domain\n");
150
151 setup_irq(parent_irq, &intc_cascade_action);
152 return 0;
153
154out_unmap_irq:
155 irq_dispose_mapping(parent_irq);
156out_free:
157 kfree(intc);
158out_err:
159 return err;
160}
161
162static int __init intc_1chip_of_init(struct device_node *node,
163 struct device_node *parent)
164{
165 return ingenic_intc_of_init(node, 1);
166}
167IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", intc_1chip_of_init);
168IRQCHIP_DECLARE(jz4725b_intc, "ingenic,jz4725b-intc", intc_1chip_of_init);
169
170static int __init intc_2chip_of_init(struct device_node *node,
171 struct device_node *parent)
172{
173 return ingenic_intc_of_init(node, 2);
174}
175IRQCHIP_DECLARE(jz4770_intc, "ingenic,jz4770-intc", intc_2chip_of_init);
176IRQCHIP_DECLARE(jz4775_intc, "ingenic,jz4775-intc", intc_2chip_of_init);
177IRQCHIP_DECLARE(jz4780_intc, "ingenic,jz4780-intc", intc_2chip_of_init);
178

Warning: That file was not part of the compilation database. It may have many parsing errors.