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gerrit-public.fairphone.software / kernel / msm-4.19 / a8004a9edd8c6ee86c3e263c9082ddf64797a667 / . / drivers / irqchip / irq-sun4i.c
blob: b66d4ae0689871dd957599cebb0d4c1e20a81330 [file] [log] [blame]
Maxime Ripardd7fbc6c2013-03-24 10:10:04 +0100[diff] [blame]1/*
2 * Allwinner A1X SoCs IRQ chip driver.
3 *
4 * Copyright (C) 2012 Maxime Ripard
5 *
6 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 *
8 * Based on code from
9 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
10 * Benn Huang <benn@allwinnertech.com>
11 *
12 * This file is licensed under the terms of the GNU General Public
13 * License version 2. This program is licensed "as is" without any
14 * warranty of any kind, whether express or implied.
15 */
16
17#include <linux/io.h>
18#include <linux/irq.h>
19#include <linux/of.h>
20#include <linux/of_address.h>
21#include <linux/of_irq.h>
22
23#include <asm/exception.h>
24#include <asm/mach/irq.h>
25
26#include "irqchip.h"
27
28#define SUN4I_IRQ_VECTOR_REG 0x00
29#define SUN4I_IRQ_PROTECTION_REG 0x08
30#define SUN4I_IRQ_NMI_CTRL_REG 0x0c
31#define SUN4I_IRQ_PENDING_REG(x) (0x10 + 0x4 * x)
32#define SUN4I_IRQ_FIQ_PENDING_REG(x) (0x20 + 0x4 * x)
33#define SUN4I_IRQ_ENABLE_REG(x) (0x40 + 0x4 * x)
34#define SUN4I_IRQ_MASK_REG(x) (0x50 + 0x4 * x)
35
36static void __iomem *sun4i_irq_base;
37static struct irq_domain *sun4i_irq_domain;
38
39static asmlinkage void __exception_irq_entry sun4i_handle_irq(struct pt_regs *regs);
40
41void sun4i_irq_ack(struct irq_data *irqd)
42{
43 unsigned int irq = irqd_to_hwirq(irqd);
44 unsigned int irq_off = irq % 32;
45 int reg = irq / 32;
46 u32 val;
47
48 val = readl(sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg));
49 writel(val | (1 << irq_off),
50 sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg));
51}
52
53static void sun4i_irq_mask(struct irq_data *irqd)
54{
55 unsigned int irq = irqd_to_hwirq(irqd);
56 unsigned int irq_off = irq % 32;
57 int reg = irq / 32;
58 u32 val;
59
60 val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
61 writel(val & ~(1 << irq_off),
62 sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
63}
64
65static void sun4i_irq_unmask(struct irq_data *irqd)
66{
67 unsigned int irq = irqd_to_hwirq(irqd);
68 unsigned int irq_off = irq % 32;
69 int reg = irq / 32;
70 u32 val;
71
72 val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
73 writel(val | (1 << irq_off),
74 sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
75}
76
77static struct irq_chip sun4i_irq_chip = {
78 .name = "sun4i_irq",
79 .irq_ack = sun4i_irq_ack,
80 .irq_mask = sun4i_irq_mask,
81 .irq_unmask = sun4i_irq_unmask,
82};
83
84static int sun4i_irq_map(struct irq_domain *d, unsigned int virq,
85 irq_hw_number_t hw)
86{
87 irq_set_chip_and_handler(virq, &sun4i_irq_chip,
88 handle_level_irq);
89 set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
90
91 return 0;
92}
93
94static struct irq_domain_ops sun4i_irq_ops = {
95 .map = sun4i_irq_map,
96 .xlate = irq_domain_xlate_onecell,
97};
98
99static int __init sun4i_of_init(struct device_node *node,
100 struct device_node *parent)
101{
102 sun4i_irq_base = of_iomap(node, 0);
103 if (!sun4i_irq_base)
104 panic("%s: unable to map IC registers\n",
105 node->full_name);
106
107 /* Disable all interrupts */
108 writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(0));
109 writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(1));
110 writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(2));
111
112 /* Mask all the interrupts */
113 writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(0));
114 writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(1));
115 writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(2));
116
117 /* Clear all the pending interrupts */
118 writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(0));
119 writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(1));
120 writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(2));
121
122 /* Enable protection mode */
123 writel(0x01, sun4i_irq_base + SUN4I_IRQ_PROTECTION_REG);
124
125 /* Configure the external interrupt source type */
126 writel(0x00, sun4i_irq_base + SUN4I_IRQ_NMI_CTRL_REG);
127
128 sun4i_irq_domain = irq_domain_add_linear(node, 3 * 32,
129 &sun4i_irq_ops, NULL);
130 if (!sun4i_irq_domain)
131 panic("%s: unable to create IRQ domain\n", node->full_name);
132
133 set_handle_irq(sun4i_handle_irq);
134
135 return 0;
136}
137IRQCHIP_DECLARE(allwinner_sun4i_ic, "allwinner,sun4i-ic", sun4i_of_init);
138
139static asmlinkage void __exception_irq_entry sun4i_handle_irq(struct pt_regs *regs)
140{
141 u32 irq, hwirq;
142
143 hwirq = readl(sun4i_irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
144 while (hwirq != 0) {
145 irq = irq_find_mapping(sun4i_irq_domain, hwirq);
146 handle_IRQ(irq, regs);
147 hwirq = readl(sun4i_irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
148 }
149}