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1 /* linux/arch/arm/plat-s3c24xx/irq-om.c
2  *
3  * Copyright (c) 2003-2004 Simtec Electronics
4  *	Ben Dooks <ben@simtec.co.uk>
5  *	http://armlinux.simtec.co.uk/
6  *
7  * S3C24XX - IRQ PM code
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 
19 #include <plat/cpu.h>
20 #include <plat/pm.h>
21 #include <plat/irq.h>
22 
23 #include <asm/irq.h>
24 
25 /* state for IRQs over sleep */
26 
27 /* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources
28  *
29  * set bit to 1 in allow bitfield to enable the wakeup settings on it
30 */
31 
32 unsigned long s3c_irqwake_intallow	= 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL;
33 unsigned long s3c_irqwake_eintallow	= 0x0000fff0L;
34 
s3c_irq_wake(struct irq_data * data,unsigned int state)35 int s3c_irq_wake(struct irq_data *data, unsigned int state)
36 {
37 	unsigned long irqbit = 1 << (data->irq - IRQ_EINT0);
38 
39 	if (!(s3c_irqwake_intallow & irqbit))
40 		return -ENOENT;
41 
42 	printk(KERN_INFO "wake %s for irq %d\n",
43 	       state ? "enabled" : "disabled", data->irq);
44 
45 	if (!state)
46 		s3c_irqwake_intmask |= irqbit;
47 	else
48 		s3c_irqwake_intmask &= ~irqbit;
49 
50 	return 0;
51 }
52 
53 static struct sleep_save irq_save[] = {
54 	SAVE_ITEM(S3C2410_INTMSK),
55 	SAVE_ITEM(S3C2410_INTSUBMSK),
56 };
57 
58 /* the extint values move between the s3c2410/s3c2440 and the s3c2412
59  * so we use an array to hold them, and to calculate the address of
60  * the register at run-time
61 */
62 
63 static unsigned long save_extint[3];
64 static unsigned long save_eintflt[4];
65 static unsigned long save_eintmask;
66 
s3c24xx_irq_suspend(void)67 int s3c24xx_irq_suspend(void)
68 {
69 	unsigned int i;
70 
71 	for (i = 0; i < ARRAY_SIZE(save_extint); i++)
72 		save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
73 
74 	for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
75 		save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
76 
77 	s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
78 	save_eintmask = __raw_readl(S3C24XX_EINTMASK);
79 
80 	return 0;
81 }
82 
s3c24xx_irq_resume(void)83 void s3c24xx_irq_resume(void)
84 {
85 	unsigned int i;
86 
87 	for (i = 0; i < ARRAY_SIZE(save_extint); i++)
88 		__raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
89 
90 	for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
91 		__raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
92 
93 	s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
94 	__raw_writel(save_eintmask, S3C24XX_EINTMASK);
95 }
96