Merge commit 'v2.6.29' into timers/core
[linux-2.6] / arch / arm / plat-s3c64xx / irq-eint.c
1 /* arch/arm/plat-s3c64xx/irq-eint.c
2  *
3  * Copyright 2008 Openmoko, Inc.
4  * Copyright 2008 Simtec Electronics
5  *      Ben Dooks <ben@simtec.co.uk>
6  *      http://armlinux.simtec.co.uk/
7  *
8  * S3C64XX - Interrupt handling for IRQ_EINT(x)
9  *
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.
13  */
14
15 #include <linux/kernel.h>
16 #include <linux/interrupt.h>
17 #include <linux/gpio.h>
18 #include <linux/irq.h>
19 #include <linux/io.h>
20
21 #include <asm/hardware/vic.h>
22
23 #include <plat/regs-irqtype.h>
24 #include <plat/regs-gpio.h>
25 #include <plat/gpio-cfg.h>
26
27 #include <mach/map.h>
28 #include <plat/cpu.h>
29
30 /* GPIO is 0x7F008xxx, */
31 #define S3C64XX_GPIOREG(x)      (S3C64XX_VA_GPIO + (x))
32
33 #define S3C64XX_EINT0CON0       S3C64XX_GPIOREG(0x900)
34 #define S3C64XX_EINT0CON1       S3C64XX_GPIOREG(0x904)
35 #define S3C64XX_EINT0FLTCON0    S3C64XX_GPIOREG(0x910)
36 #define S3C64XX_EINT0FLTCON1    S3C64XX_GPIOREG(0x914)
37 #define S3C64XX_EINT0FLTCON2    S3C64XX_GPIOREG(0x918)
38 #define S3C64XX_EINT0FLTCON3    S3C64XX_GPIOREG(0x91C)
39
40 #define S3C64XX_EINT0MASK       S3C64XX_GPIOREG(0x920)
41 #define S3C64XX_EINT0PEND       S3C64XX_GPIOREG(0x924)
42
43
44 #define eint_offset(irq)        ((irq) - IRQ_EINT(0))
45 #define eint_irq_to_bit(irq)    (1 << eint_offset(irq))
46
47 static inline void s3c_irq_eint_mask(unsigned int irq)
48 {
49         u32 mask;
50
51         mask = __raw_readl(S3C64XX_EINT0MASK);
52         mask |= eint_irq_to_bit(irq);
53         __raw_writel(mask, S3C64XX_EINT0MASK);
54 }
55
56 static void s3c_irq_eint_unmask(unsigned int irq)
57 {
58         u32 mask;
59
60         mask = __raw_readl(S3C64XX_EINT0MASK);
61         mask &= ~eint_irq_to_bit(irq);
62         __raw_writel(mask, S3C64XX_EINT0MASK);
63 }
64
65 static inline void s3c_irq_eint_ack(unsigned int irq)
66 {
67         __raw_writel(eint_irq_to_bit(irq), S3C64XX_EINT0PEND);
68 }
69
70 static void s3c_irq_eint_maskack(unsigned int irq)
71 {
72         /* compiler should in-line these */
73         s3c_irq_eint_mask(irq);
74         s3c_irq_eint_ack(irq);
75 }
76
77 static int s3c_irq_eint_set_type(unsigned int irq, unsigned int type)
78 {
79         int offs = eint_offset(irq);
80         int pin;
81         int shift;
82         u32 ctrl, mask;
83         u32 newvalue = 0;
84         void __iomem *reg;
85
86         if (offs > 27)
87                 return -EINVAL;
88
89         if (offs <= 15)
90                 reg = S3C64XX_EINT0CON0;
91         else
92                 reg = S3C64XX_EINT0CON1;
93
94         switch (type) {
95         case IRQ_TYPE_NONE:
96                 printk(KERN_WARNING "No edge setting!\n");
97                 break;
98
99         case IRQ_TYPE_EDGE_RISING:
100                 newvalue = S3C2410_EXTINT_RISEEDGE;
101                 break;
102
103         case IRQ_TYPE_EDGE_FALLING:
104                 newvalue = S3C2410_EXTINT_FALLEDGE;
105                 break;
106
107         case IRQ_TYPE_EDGE_BOTH:
108                 newvalue = S3C2410_EXTINT_BOTHEDGE;
109                 break;
110
111         case IRQ_TYPE_LEVEL_LOW:
112                 newvalue = S3C2410_EXTINT_LOWLEV;
113                 break;
114
115         case IRQ_TYPE_LEVEL_HIGH:
116                 newvalue = S3C2410_EXTINT_HILEV;
117                 break;
118
119         default:
120                 printk(KERN_ERR "No such irq type %d", type);
121                 return -1;
122         }
123
124         shift = (offs / 2) * 4;
125         mask = 0x7 << shift;
126
127         ctrl = __raw_readl(reg);
128         ctrl &= ~mask;
129         ctrl |= newvalue << shift;
130         __raw_writel(ctrl, reg);
131
132         /* set the GPIO pin appropriately */
133
134         if (offs < 23)
135                 pin = S3C64XX_GPN(offs);
136         else
137                 pin = S3C64XX_GPM(offs - 23);
138
139         s3c_gpio_cfgpin(pin, S3C_GPIO_SFN(2));
140
141         return 0;
142 }
143
144 static struct irq_chip s3c_irq_eint = {
145         .name           = "s3c-eint",
146         .mask           = s3c_irq_eint_mask,
147         .unmask         = s3c_irq_eint_unmask,
148         .mask_ack       = s3c_irq_eint_maskack,
149         .ack            = s3c_irq_eint_ack,
150         .set_type       = s3c_irq_eint_set_type,
151 };
152
153 /* s3c_irq_demux_eint
154  *
155  * This function demuxes the IRQ from the group0 external interrupts,
156  * from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into
157  * the specific handlers s3c_irq_demux_eintX_Y.
158  */
159 static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
160 {
161         u32 status = __raw_readl(S3C64XX_EINT0PEND);
162         u32 mask = __raw_readl(S3C64XX_EINT0MASK);
163         unsigned int irq;
164
165         status &= ~mask;
166         status >>= start;
167         status &= (1 << (end - start + 1)) - 1;
168
169         for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
170                 if (status & 1)
171                         generic_handle_irq(irq);
172
173                 status >>= 1;
174         }
175 }
176
177 static void s3c_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
178 {
179         s3c_irq_demux_eint(0, 3);
180 }
181
182 static void s3c_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
183 {
184         s3c_irq_demux_eint(4, 11);
185 }
186
187 static void s3c_irq_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
188 {
189         s3c_irq_demux_eint(12, 19);
190 }
191
192 static void s3c_irq_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
193 {
194         s3c_irq_demux_eint(20, 27);
195 }
196
197 static int __init s3c64xx_init_irq_eint(void)
198 {
199         int irq;
200
201         for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
202                 set_irq_chip(irq, &s3c_irq_eint);
203                 set_irq_handler(irq, handle_level_irq);
204                 set_irq_flags(irq, IRQF_VALID);
205         }
206
207         set_irq_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3);
208         set_irq_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11);
209         set_irq_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19);
210         set_irq_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27);
211
212         return 0;
213 }
214
215 arch_initcall(s3c64xx_init_irq_eint);