1 /* arch/arm/plat-s3c64xx/irq-eint.c
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2008 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
8 * S3C64XX - Interrupt handling for IRQ_EINT(x)
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.
15 #include <linux/kernel.h>
16 #include <linux/interrupt.h>
17 #include <linux/gpio.h>
18 #include <linux/irq.h>
21 #include <asm/hardware/vic.h>
23 #include <plat/regs-irqtype.h>
24 #include <plat/regs-gpio.h>
25 #include <plat/gpio-cfg.h>
30 /* GPIO is 0x7F008xxx, */
31 #define S3C64XX_GPIOREG(x) (S3C64XX_VA_GPIO + (x))
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)
40 #define S3C64XX_EINT0MASK S3C64XX_GPIOREG(0x920)
41 #define S3C64XX_EINT0PEND S3C64XX_GPIOREG(0x924)
44 #define eint_offset(irq) ((irq) - IRQ_EINT(0))
45 #define eint_irq_to_bit(irq) (1 << eint_offset(irq))
47 static inline void s3c_irq_eint_mask(unsigned int irq)
51 mask = __raw_readl(S3C64XX_EINT0MASK);
52 mask |= eint_irq_to_bit(irq);
53 __raw_writel(mask, S3C64XX_EINT0MASK);
56 static void s3c_irq_eint_unmask(unsigned int irq)
60 mask = __raw_readl(S3C64XX_EINT0MASK);
61 mask &= ~eint_irq_to_bit(irq);
62 __raw_writel(mask, S3C64XX_EINT0MASK);
65 static inline void s3c_irq_eint_ack(unsigned int irq)
67 __raw_writel(eint_irq_to_bit(irq), S3C64XX_EINT0PEND);
70 static void s3c_irq_eint_maskack(unsigned int irq)
72 /* compiler should in-line these */
73 s3c_irq_eint_mask(irq);
74 s3c_irq_eint_ack(irq);
77 static int s3c_irq_eint_set_type(unsigned int irq, unsigned int type)
79 int offs = eint_offset(irq);
90 reg = S3C64XX_EINT0CON0;
92 reg = S3C64XX_EINT0CON1;
96 printk(KERN_WARNING "No edge setting!\n");
99 case IRQ_TYPE_EDGE_RISING:
100 newvalue = S3C2410_EXTINT_RISEEDGE;
103 case IRQ_TYPE_EDGE_FALLING:
104 newvalue = S3C2410_EXTINT_FALLEDGE;
107 case IRQ_TYPE_EDGE_BOTH:
108 newvalue = S3C2410_EXTINT_BOTHEDGE;
111 case IRQ_TYPE_LEVEL_LOW:
112 newvalue = S3C2410_EXTINT_LOWLEV;
115 case IRQ_TYPE_LEVEL_HIGH:
116 newvalue = S3C2410_EXTINT_HILEV;
120 printk(KERN_ERR "No such irq type %d", type);
124 shift = (offs / 2) * 4;
127 ctrl = __raw_readl(reg);
129 ctrl |= newvalue << shift;
130 __raw_writel(ctrl, reg);
132 /* set the GPIO pin appropriately */
135 pin = S3C64XX_GPN(offs);
137 pin = S3C64XX_GPM(offs - 23);
139 s3c_gpio_cfgpin(pin, S3C_GPIO_SFN(2));
144 static struct irq_chip s3c_irq_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,
153 /* s3c_irq_demux_eint
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.
159 static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
161 u32 status = __raw_readl(S3C64XX_EINT0PEND);
162 u32 mask = __raw_readl(S3C64XX_EINT0MASK);
167 status &= (1 << (end - start + 1)) - 1;
169 for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
171 generic_handle_irq(irq);
177 static void s3c_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
179 s3c_irq_demux_eint(0, 3);
182 static void s3c_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
184 s3c_irq_demux_eint(4, 11);
187 static void s3c_irq_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
189 s3c_irq_demux_eint(12, 19);
192 static void s3c_irq_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
194 s3c_irq_demux_eint(20, 27);
197 static int __init s3c64xx_init_irq_eint(void)
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);
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);
215 arch_initcall(s3c64xx_init_irq_eint);