1// SPDX-License-Identifier: GPL-2.0
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#include <linux/init.h>
10#include <linux/module.h>
11#include <linux/interrupt.h>
12#include <linux/irq.h>
13#include <linux/syscore_ops.h>
14#include <linux/io.h>
15
16#include "cpu.h"
17#include "pm.h"
18#include <mach/map-base.h>
19#include "map-s3c.h"
20
21#include "regs-irq.h"
22#include "regs-gpio.h"
23#include "pm-core.h"
24
25#include <asm/irq.h>
26
27int s3c_irq_wake(struct irq_data *data, unsigned int state)
28{
29	unsigned long irqbit = 1 << data->hwirq;
30
31	if (!(s3c_irqwake_intallow & irqbit))
32		return -ENOENT;
33
34	pr_info("wake %s for hwirq %lu\n",
35		state ? "enabled" : "disabled", data->hwirq);
36
37	if (!state)
38		s3c_irqwake_intmask |= irqbit;
39	else
40		s3c_irqwake_intmask &= ~irqbit;
41
42	return 0;
43}
44
45static struct sleep_save irq_save[] = {
46	SAVE_ITEM(S3C2410_INTMSK),
47	SAVE_ITEM(S3C2410_INTSUBMSK),
48};
49
50/* the extint values move between the s3c2410/s3c2440 and the s3c2412
51 * so we use an array to hold them, and to calculate the address of
52 * the register at run-time
53*/
54
55static unsigned long save_extint[3];
56static unsigned long save_eintflt[4];
57static unsigned long save_eintmask;
58
59static int s3c24xx_irq_suspend(void)
60{
61	unsigned int i;
62
63	for (i = 0; i < ARRAY_SIZE(save_extint); i++)
64		save_extint[i] = __raw_readl(S3C24XX_EXTINT0 + (i*4));
65
66	for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
67		save_eintflt[i] = __raw_readl(S3C24XX_EINFLT0 + (i*4));
68
69	s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
70	save_eintmask = __raw_readl(S3C24XX_EINTMASK);
71
72	return 0;
73}
74
75static void s3c24xx_irq_resume(void)
76{
77	unsigned int i;
78
79	for (i = 0; i < ARRAY_SIZE(save_extint); i++)
80		__raw_writel(save_extint[i], S3C24XX_EXTINT0 + (i*4));
81
82	for (i = 0; i < ARRAY_SIZE(save_eintflt); i++)
83		__raw_writel(save_eintflt[i], S3C24XX_EINFLT0 + (i*4));
84
85	s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
86	__raw_writel(save_eintmask, S3C24XX_EINTMASK);
87}
88
89struct syscore_ops s3c24xx_irq_syscore_ops = {
90	.suspend	= s3c24xx_irq_suspend,
91	.resume		= s3c24xx_irq_resume,
92};
93
94#ifdef CONFIG_CPU_S3C2416
95static struct sleep_save s3c2416_irq_save[] = {
96	SAVE_ITEM(S3C2416_INTMSK2),
97};
98
99static int s3c2416_irq_suspend(void)
100{
101	s3c_pm_do_save(s3c2416_irq_save, ARRAY_SIZE(s3c2416_irq_save));
102
103	return 0;
104}
105
106static void s3c2416_irq_resume(void)
107{
108	s3c_pm_do_restore(s3c2416_irq_save, ARRAY_SIZE(s3c2416_irq_save));
109}
110
111struct syscore_ops s3c2416_irq_syscore_ops = {
112	.suspend	= s3c2416_irq_suspend,
113	.resume		= s3c2416_irq_resume,
114};
115#endif
116