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