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1 | /* 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 | ||
31 | static 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 | ||
40 | static 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 | ||
49 | static 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 | ||
54 | static 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 | ||
61 | static int s5p_irq_eint_set_type(unsigned int irq, unsigned int type) | |
62 | { | |
63 | int offs = eint_offset(irq); | |
64 | 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 | ||
120 | static 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 | */ | |
140 | static inline void s5p_irq_demux_eint(unsigned int start) | |
141 | { | |
142 | u32 status; | |
143 | u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start))); | |
144 | unsigned int irq; | |
145 | ||
146 | status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start))); | |
147 | status &= ~mask; | |
148 | status &= 0xff; | |
149 | ||
150 | while (status) { | |
151 | irq = fls(status); | |
152 | generic_handle_irq(irq - 1 + start); | |
153 | status &= ~(1 << irq); | |
154 | } | |
155 | } | |
156 | ||
157 | static void s5p_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc) | |
158 | { | |
159 | s5p_irq_demux_eint(IRQ_EINT(16)); | |
160 | s5p_irq_demux_eint(IRQ_EINT(24)); | |
161 | } | |
162 | ||
163 | static inline void s5p_irq_vic_eint_mask(unsigned int irq) | |
164 | { | |
165 | s5p_irq_eint_mask(irq); | |
166 | } | |
167 | ||
168 | static void s5p_irq_vic_eint_unmask(unsigned int irq) | |
169 | { | |
170 | s5p_irq_eint_unmask(irq); | |
171 | } | |
172 | ||
173 | static inline void s5p_irq_vic_eint_ack(unsigned int irq) | |
174 | { | |
175 | __raw_writel(eint_irq_to_bit(irq), S5P_EINT_PEND(EINT_REG_NR(irq))); | |
176 | } | |
177 | ||
178 | static void s5p_irq_vic_eint_maskack(unsigned int irq) | |
179 | { | |
180 | s5p_irq_vic_eint_mask(irq); | |
181 | s5p_irq_vic_eint_ack(irq); | |
182 | } | |
183 | ||
184 | static struct irq_chip s5p_irq_vic_eint = { | |
185 | .name = "s5p_vic_eint", | |
186 | .mask = s5p_irq_vic_eint_mask, | |
187 | .unmask = s5p_irq_vic_eint_unmask, | |
188 | .mask_ack = s5p_irq_vic_eint_maskack, | |
189 | .ack = s5p_irq_vic_eint_ack, | |
190 | .set_type = s5p_irq_eint_set_type, | |
191 | #ifdef CONFIG_PM | |
192 | .set_wake = s3c_irqext_wake, | |
193 | #endif | |
194 | }; | |
195 | ||
196 | int __init s5p_init_irq_eint(void) | |
197 | { | |
198 | int irq; | |
199 | ||
200 | for (irq = IRQ_EINT(0); irq <= IRQ_EINT(15); irq++) | |
201 | set_irq_chip(irq, &s5p_irq_vic_eint); | |
202 | ||
203 | for (irq = IRQ_EINT(16); irq <= IRQ_EINT(31); irq++) { | |
204 | set_irq_chip(irq, &s5p_irq_eint); | |
205 | set_irq_handler(irq, handle_level_irq); | |
206 | set_irq_flags(irq, IRQF_VALID); | |
207 | } | |
208 | ||
209 | set_irq_chained_handler(IRQ_EINT16_31, s5p_irq_demux_eint16_31); | |
210 | return 0; | |
211 | } | |
212 | ||
213 | arch_initcall(s5p_init_irq_eint); |