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/irq.h>
20 #include <asm/hardware/vic.h>
22 #include <plat/regs-irqtype.h>
27 /* GPIO is 0x7F008xxx, */
28 #define S3C64XX_GPIOREG(x) (S3C64XX_VA_GPIO + (x))
30 #define S3C64XX_EINT0CON0 S3C64XX_GPIOREG(0x900)
31 #define S3C64XX_EINT0CON1 S3C64XX_GPIOREG(0x904)
32 #define S3C64XX_EINT0FLTCON0 S3C64XX_GPIOREG(0x910)
33 #define S3C64XX_EINT0FLTCON1 S3C64XX_GPIOREG(0x914)
34 #define S3C64XX_EINT0FLTCON2 S3C64XX_GPIOREG(0x918)
35 #define S3C64XX_EINT0FLTCON3 S3C64XX_GPIOREG(0x91C)
37 #define S3C64XX_EINT0MASK S3C64XX_GPIOREG(0x920)
38 #define S3C64XX_EINT0PEND S3C64XX_GPIOREG(0x924)
41 #define eint_offset(irq) ((irq) - IRQ_EINT(0))
42 #define eint_irq_to_bit(irq) (1 << eint_offset(irq))
44 static inline void s3c_irq_eint_mask(unsigned int irq)
48 mask = __raw_readl(S3C64XX_EINT0MASK);
49 mask |= eint_irq_to_bit(irq);
50 __raw_writel(mask, S3C64XX_EINT0MASK);
53 static void s3c_irq_eint_unmask(unsigned int irq)
57 mask = __raw_readl(S3C64XX_EINT0MASK);
58 mask &= ~eint_irq_to_bit(irq);
59 __raw_writel(mask, S3C64XX_EINT0MASK);
62 static inline void s3c_irq_eint_ack(unsigned int irq)
64 __raw_writel(eint_irq_to_bit(irq), S3C64XX_EINT0PEND);
67 static void s3c_irq_eint_maskack(unsigned int irq)
69 /* compiler should in-line these */
70 s3c_irq_eint_mask(irq);
71 s3c_irq_eint_ack(irq);
74 static int s3c_irq_eint_set_type(unsigned int irq, unsigned int type)
76 int offs = eint_offset(irq);
86 reg = S3C64XX_EINT0CON0;
88 reg = S3C64XX_EINT0CON1;
92 printk(KERN_WARNING "No edge setting!\n");
95 case IRQ_TYPE_EDGE_RISING:
96 newvalue = S3C2410_EXTINT_RISEEDGE;
99 case IRQ_TYPE_EDGE_FALLING:
100 newvalue = S3C2410_EXTINT_FALLEDGE;
103 case IRQ_TYPE_EDGE_BOTH:
104 newvalue = S3C2410_EXTINT_BOTHEDGE;
107 case IRQ_TYPE_LEVEL_LOW:
108 newvalue = S3C2410_EXTINT_LOWLEV;
111 case IRQ_TYPE_LEVEL_HIGH:
112 newvalue = S3C2410_EXTINT_HILEV;
116 printk(KERN_ERR "No such irq type %d", type);
120 shift = (offs / 2) * 4;
123 ctrl = __raw_readl(reg);
125 ctrl |= newvalue << shift;
126 __raw_writel(ctrl, reg);
131 static struct irq_chip s3c_irq_eint = {
133 .mask = s3c_irq_eint_mask,
134 .unmask = s3c_irq_eint_unmask,
135 .mask_ack = s3c_irq_eint_maskack,
136 .ack = s3c_irq_eint_ack,
137 .set_type = s3c_irq_eint_set_type,
140 /* s3c_irq_demux_eint
142 * This function demuxes the IRQ from the group0 external interrupts,
143 * from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into
144 * the specific handlers s3c_irq_demux_eintX_Y.
146 static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
148 u32 status = __raw_readl(S3C64XX_EINT0PEND);
149 u32 mask = __raw_readl(S3C64XX_EINT0MASK);
154 status &= (1 << (end - start + 1)) - 1;
156 for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
158 generic_handle_irq(irq);
164 static void s3c_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
166 s3c_irq_demux_eint(0, 3);
169 static void s3c_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
171 s3c_irq_demux_eint(4, 11);
174 static void s3c_irq_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
176 s3c_irq_demux_eint(12, 19);
179 static void s3c_irq_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
181 s3c_irq_demux_eint(20, 27);
184 int __init s3c64xx_init_irq_eint(void)
188 for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
189 set_irq_chip(irq, &s3c_irq_eint);
190 set_irq_handler(irq, handle_level_irq);
191 set_irq_flags(irq, IRQF_VALID);
194 set_irq_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3);
195 set_irq_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11);
196 set_irq_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19);
197 set_irq_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27);
202 arch_initcall(s3c64xx_init_irq_eint);