1/* arch/arm/plat-s3c64xx/irq-pm.c
2 *
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2008 Simtec Electronics
5 *      Ben Dooks <ben@simtec.co.uk>
6 *      http://armlinux.simtec.co.uk/
7 *
8 * S3C64XX - Interrupt handling Power Management
9 *
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.
13 */
14
15/*
16 * NOTE: Code in this file is not used when booting with Device Tree support.
17 */
18
19#include <linux/kernel.h>
20#include <linux/syscore_ops.h>
21#include <linux/interrupt.h>
22#include <linux/serial_core.h>
23#include <linux/serial_s3c.h>
24#include <linux/irq.h>
25#include <linux/io.h>
26#include <linux/of.h>
27
28#include <mach/map.h>
29
30#include <mach/regs-gpio.h>
31#include <plat/cpu.h>
32#include <plat/pm.h>
33
34/* We handled all the IRQ types in this code, to save having to make several
35 * small files to handle each different type separately. Having the EINT_GRP
36 * code here shouldn't be as much bloat as the IRQ table space needed when
37 * they are enabled. The added benefit is we ensure that these registers are
38 * in the same state as we suspended.
39 */
40
41static struct sleep_save irq_save[] = {
42	SAVE_ITEM(S3C64XX_PRIORITY),
43	SAVE_ITEM(S3C64XX_EINT0CON0),
44	SAVE_ITEM(S3C64XX_EINT0CON1),
45	SAVE_ITEM(S3C64XX_EINT0FLTCON0),
46	SAVE_ITEM(S3C64XX_EINT0FLTCON1),
47	SAVE_ITEM(S3C64XX_EINT0FLTCON2),
48	SAVE_ITEM(S3C64XX_EINT0FLTCON3),
49	SAVE_ITEM(S3C64XX_EINT0MASK),
50};
51
52static struct irq_grp_save {
53	u32	fltcon;
54	u32	con;
55	u32	mask;
56} eint_grp_save[5];
57
58#ifndef CONFIG_SERIAL_SAMSUNG_UARTS
59#define SERIAL_SAMSUNG_UARTS 0
60#else
61#define	SERIAL_SAMSUNG_UARTS CONFIG_SERIAL_SAMSUNG_UARTS
62#endif
63
64static u32 irq_uart_mask[SERIAL_SAMSUNG_UARTS];
65
66static int s3c64xx_irq_pm_suspend(void)
67{
68	struct irq_grp_save *grp = eint_grp_save;
69	int i;
70
71	S3C_PMDBG("%s: suspending IRQs\n", __func__);
72
73	s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
74
75	for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
76		irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
77
78	for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
79		grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
80		grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
81		grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
82	}
83
84	return 0;
85}
86
87static void s3c64xx_irq_pm_resume(void)
88{
89	struct irq_grp_save *grp = eint_grp_save;
90	int i;
91
92	S3C_PMDBG("%s: resuming IRQs\n", __func__);
93
94	s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
95
96	for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
97		__raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
98
99	for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
100		__raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
101		__raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
102		__raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
103	}
104
105	S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
106}
107
108static struct syscore_ops s3c64xx_irq_syscore_ops = {
109	.suspend = s3c64xx_irq_pm_suspend,
110	.resume	 = s3c64xx_irq_pm_resume,
111};
112
113static __init int s3c64xx_syscore_init(void)
114{
115	/* Appropriate drivers (pinctrl, uart) handle this when using DT. */
116	if (of_have_populated_dt())
117		return 0;
118
119	register_syscore_ops(&s3c64xx_irq_syscore_ops);
120
121	return 0;
122}
123
124core_initcall(s3c64xx_syscore_init);
125