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Jongpill Lee0df04f82010-05-17 16:56:26 +09001/* linux/arch/arm/plat-s5p/irq-eint.c
2 *
3 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * S5P - IRQ EINT support
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11*/
12
13#include <linux/kernel.h>
14#include <linux/interrupt.h>
15#include <linux/irq.h>
16#include <linux/io.h>
17#include <linux/sysdev.h>
18#include <linux/gpio.h>
19
20#include <asm/hardware/vic.h>
21
22#include <plat/regs-irqtype.h>
23
24#include <mach/map.h>
25#include <plat/cpu.h>
26#include <plat/pm.h>
27
28#include <plat/gpio-cfg.h>
29#include <mach/regs-gpio.h>
30
31static inline void s5p_irq_eint_mask(unsigned int irq)
32{
33 u32 mask;
34
35 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(irq)));
36 mask |= eint_irq_to_bit(irq);
37 __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(irq)));
38}
39
40static void s5p_irq_eint_unmask(unsigned int irq)
41{
42 u32 mask;
43
44 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(irq)));
45 mask &= ~(eint_irq_to_bit(irq));
46 __raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(irq)));
47}
48
49static inline void s5p_irq_eint_ack(unsigned int irq)
50{
51 __raw_writel(eint_irq_to_bit(irq), S5P_EINT_PEND(EINT_REG_NR(irq)));
52}
53
54static void s5p_irq_eint_maskack(unsigned int irq)
55{
56 /* compiler should in-line these */
57 s5p_irq_eint_mask(irq);
58 s5p_irq_eint_ack(irq);
59}
60
61static int s5p_irq_eint_set_type(unsigned int irq, unsigned int type)
62{
Pannaga Bhushan5fae4052010-05-24 15:08:31 +090063 int offs = EINT_OFFSET(irq);
Jongpill Lee0df04f82010-05-17 16:56:26 +090064 int shift;
65 u32 ctrl, mask;
66 u32 newvalue = 0;
67
68 switch (type) {
69 case IRQ_TYPE_EDGE_RISING:
70 newvalue = S5P_EXTINT_RISEEDGE;
71 break;
72
73 case IRQ_TYPE_EDGE_FALLING:
74 newvalue = S5P_EXTINT_RISEEDGE;
75 break;
76
77 case IRQ_TYPE_EDGE_BOTH:
78 newvalue = S5P_EXTINT_BOTHEDGE;
79 break;
80
81 case IRQ_TYPE_LEVEL_LOW:
82 newvalue = S5P_EXTINT_LOWLEV;
83 break;
84
85 case IRQ_TYPE_LEVEL_HIGH:
86 newvalue = S5P_EXTINT_HILEV;
87 break;
88
89 default:
90 printk(KERN_ERR "No such irq type %d", type);
91 return -EINVAL;
92 }
93
94 shift = (offs & 0x7) * 4;
95 mask = 0x7 << shift;
96
97 ctrl = __raw_readl(S5P_EINT_CON(EINT_REG_NR(irq)));
98 ctrl &= ~mask;
99 ctrl |= newvalue << shift;
100 __raw_writel(ctrl, S5P_EINT_CON(EINT_REG_NR(irq)));
101
102 if ((0 <= offs) && (offs < 8))
103 s3c_gpio_cfgpin(EINT_GPIO_0(offs & 0x7), EINT_MODE);
104
105 else if ((8 <= offs) && (offs < 16))
106 s3c_gpio_cfgpin(EINT_GPIO_1(offs & 0x7), EINT_MODE);
107
108 else if ((16 <= offs) && (offs < 24))
109 s3c_gpio_cfgpin(EINT_GPIO_2(offs & 0x7), EINT_MODE);
110
111 else if ((24 <= offs) && (offs < 32))
112 s3c_gpio_cfgpin(EINT_GPIO_3(offs & 0x7), EINT_MODE);
113
114 else
115 printk(KERN_ERR "No such irq number %d", offs);
116
117 return 0;
118}
119
120static struct irq_chip s5p_irq_eint = {
121 .name = "s5p-eint",
122 .mask = s5p_irq_eint_mask,
123 .unmask = s5p_irq_eint_unmask,
124 .mask_ack = s5p_irq_eint_maskack,
125 .ack = s5p_irq_eint_ack,
126 .set_type = s5p_irq_eint_set_type,
127#ifdef CONFIG_PM
128 .set_wake = s3c_irqext_wake,
129#endif
130};
131
132/* s5p_irq_demux_eint
133 *
134 * This function demuxes the IRQ from the group0 external interrupts,
135 * from EINTs 16 to 31. It is designed to be inlined into the specific
136 * handler s5p_irq_demux_eintX_Y.
137 *
138 * Each EINT pend/mask registers handle eight of them.
139 */
140static inline void s5p_irq_demux_eint(unsigned int start)
141{
Pannaga Bhushan5fae4052010-05-24 15:08:31 +0900142 u32 status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start)));
Jongpill Lee0df04f82010-05-17 16:56:26 +0900143 u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start)));
144 unsigned int irq;
145
Jongpill Lee0df04f82010-05-17 16:56:26 +0900146 status &= ~mask;
147 status &= 0xff;
148
149 while (status) {
Pannaga Bhushan5fae4052010-05-24 15:08:31 +0900150 irq = fls(status) - 1;
151 generic_handle_irq(irq + start);
Jongpill Lee0df04f82010-05-17 16:56:26 +0900152 status &= ~(1 << irq);
153 }
154}
155
156static void s5p_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
157{
158 s5p_irq_demux_eint(IRQ_EINT(16));
159 s5p_irq_demux_eint(IRQ_EINT(24));
160}
161
162static inline void s5p_irq_vic_eint_mask(unsigned int irq)
163{
Pannaga Bhushan5fae4052010-05-24 15:08:31 +0900164 void __iomem *base = get_irq_chip_data(irq);
165
Jongpill Lee0df04f82010-05-17 16:56:26 +0900166 s5p_irq_eint_mask(irq);
Pannaga Bhushan5fae4052010-05-24 15:08:31 +0900167 writel(1 << EINT_OFFSET(irq), base + VIC_INT_ENABLE_CLEAR);
Jongpill Lee0df04f82010-05-17 16:56:26 +0900168}
169
170static void s5p_irq_vic_eint_unmask(unsigned int irq)
171{
Pannaga Bhushan5fae4052010-05-24 15:08:31 +0900172 void __iomem *base = get_irq_chip_data(irq);
173
Jongpill Lee0df04f82010-05-17 16:56:26 +0900174 s5p_irq_eint_unmask(irq);
Pannaga Bhushan5fae4052010-05-24 15:08:31 +0900175 writel(1 << EINT_OFFSET(irq), base + VIC_INT_ENABLE);
Jongpill Lee0df04f82010-05-17 16:56:26 +0900176}
177
178static inline void s5p_irq_vic_eint_ack(unsigned int irq)
179{
180 __raw_writel(eint_irq_to_bit(irq), S5P_EINT_PEND(EINT_REG_NR(irq)));
181}
182
183static void s5p_irq_vic_eint_maskack(unsigned int irq)
184{
185 s5p_irq_vic_eint_mask(irq);
186 s5p_irq_vic_eint_ack(irq);
187}
188
189static struct irq_chip s5p_irq_vic_eint = {
190 .name = "s5p_vic_eint",
191 .mask = s5p_irq_vic_eint_mask,
192 .unmask = s5p_irq_vic_eint_unmask,
193 .mask_ack = s5p_irq_vic_eint_maskack,
194 .ack = s5p_irq_vic_eint_ack,
195 .set_type = s5p_irq_eint_set_type,
196#ifdef CONFIG_PM
197 .set_wake = s3c_irqext_wake,
198#endif
199};
200
201int __init s5p_init_irq_eint(void)
202{
203 int irq;
204
205 for (irq = IRQ_EINT(0); irq <= IRQ_EINT(15); irq++)
206 set_irq_chip(irq, &s5p_irq_vic_eint);
207
208 for (irq = IRQ_EINT(16); irq <= IRQ_EINT(31); irq++) {
209 set_irq_chip(irq, &s5p_irq_eint);
210 set_irq_handler(irq, handle_level_irq);
211 set_irq_flags(irq, IRQF_VALID);
212 }
213
214 set_irq_chained_handler(IRQ_EINT16_31, s5p_irq_demux_eint16_31);
215 return 0;
216}
217
218arch_initcall(s5p_init_irq_eint);