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/sysdev.h>
18 #include <linux/gpio.h>
19 #include <linux/irq.h>
22 #include <asm/hardware/vic.h>
24 #include <plat/regs-irqtype.h>
25 #include <plat/regs-gpio.h>
26 #include <plat/gpio-cfg.h>
32 #define eint_offset(irq) ((irq) - IRQ_EINT(0))
33 #define eint_irq_to_bit(irq) (1 << eint_offset(irq))
35 static inline void s3c_irq_eint_mask(unsigned int irq)
39 mask = __raw_readl(S3C64XX_EINT0MASK);
40 mask |= eint_irq_to_bit(irq);
41 __raw_writel(mask, S3C64XX_EINT0MASK);
44 static void s3c_irq_eint_unmask(unsigned int irq)
48 mask = __raw_readl(S3C64XX_EINT0MASK);
49 mask &= ~eint_irq_to_bit(irq);
50 __raw_writel(mask, S3C64XX_EINT0MASK);
53 static inline void s3c_irq_eint_ack(unsigned int irq)
55 __raw_writel(eint_irq_to_bit(irq), S3C64XX_EINT0PEND);
58 static void s3c_irq_eint_maskack(unsigned int irq)
60 /* compiler should in-line these */
61 s3c_irq_eint_mask(irq);
62 s3c_irq_eint_ack(irq);
65 static int s3c_irq_eint_set_type(unsigned int irq, unsigned int type)
67 int offs = eint_offset(irq);
78 reg = S3C64XX_EINT0CON0;
80 reg = S3C64XX_EINT0CON1;
84 printk(KERN_WARNING "No edge setting!\n");
87 case IRQ_TYPE_EDGE_RISING:
88 newvalue = S3C2410_EXTINT_RISEEDGE;
91 case IRQ_TYPE_EDGE_FALLING:
92 newvalue = S3C2410_EXTINT_FALLEDGE;
95 case IRQ_TYPE_EDGE_BOTH:
96 newvalue = S3C2410_EXTINT_BOTHEDGE;
99 case IRQ_TYPE_LEVEL_LOW:
100 newvalue = S3C2410_EXTINT_LOWLEV;
103 case IRQ_TYPE_LEVEL_HIGH:
104 newvalue = S3C2410_EXTINT_HILEV;
108 printk(KERN_ERR "No such irq type %d", type);
112 shift = (offs / 2) * 4;
115 ctrl = __raw_readl(reg);
117 ctrl |= newvalue << shift;
118 __raw_writel(ctrl, reg);
120 /* set the GPIO pin appropriately */
123 pin = S3C64XX_GPN(offs);
125 pin = S3C64XX_GPM(offs - 23);
127 s3c_gpio_cfgpin(pin, S3C_GPIO_SFN(2));
132 static struct irq_chip s3c_irq_eint = {
134 .mask = s3c_irq_eint_mask,
135 .unmask = s3c_irq_eint_unmask,
136 .mask_ack = s3c_irq_eint_maskack,
137 .ack = s3c_irq_eint_ack,
138 .set_type = s3c_irq_eint_set_type,
139 .set_wake = s3c_irqext_wake,
142 /* s3c_irq_demux_eint
144 * This function demuxes the IRQ from the group0 external interrupts,
145 * from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into
146 * the specific handlers s3c_irq_demux_eintX_Y.
148 static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
150 u32 status = __raw_readl(S3C64XX_EINT0PEND);
151 u32 mask = __raw_readl(S3C64XX_EINT0MASK);
156 status &= (1 << (end - start + 1)) - 1;
158 for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
160 generic_handle_irq(irq);
166 static void s3c_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
168 s3c_irq_demux_eint(0, 3);
171 static void s3c_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
173 s3c_irq_demux_eint(4, 11);
176 static void s3c_irq_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
178 s3c_irq_demux_eint(12, 19);
181 static void s3c_irq_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
183 s3c_irq_demux_eint(20, 27);
186 static int __init s3c64xx_init_irq_eint(void)
190 for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
191 set_irq_chip(irq, &s3c_irq_eint);
192 set_irq_handler(irq, handle_level_irq);
193 set_irq_flags(irq, IRQF_VALID);
196 set_irq_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3);
197 set_irq_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11);
198 set_irq_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19);
199 set_irq_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27);
204 arch_initcall(s3c64xx_init_irq_eint);