1 /* linux/arch/arm/mach-s5p64x0/irq-pm.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * S5P64X0 - Interrupt handling Power Management
7 *
8 * Based on arch/arm/mach-s3c64xx/irq-pm.c by Ben Dooks
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 #include <linux/syscore_ops.h>
16 #include <linux/serial_core.h>
17 #include <linux/io.h>
18
19 #include <plat/regs-serial.h>
20 #include <plat/pm.h>
21
22 #include <mach/regs-gpio.h>
23
24 static struct sleep_save irq_save[] = {
25 SAVE_ITEM(S5P64X0_EINT0CON0),
26 SAVE_ITEM(S5P64X0_EINT0FLTCON0),
27 SAVE_ITEM(S5P64X0_EINT0FLTCON1),
28 SAVE_ITEM(S5P64X0_EINT0MASK),
29 };
30
31 static struct irq_grp_save {
32 u32 con;
33 u32 fltcon;
34 u32 mask;
35 } eint_grp_save[4];
36
37 static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];
38
s5p64x0_irq_pm_suspend(void)39 static int s5p64x0_irq_pm_suspend(void)
40 {
41 struct irq_grp_save *grp = eint_grp_save;
42 int i;
43
44 S3C_PMDBG("%s: suspending IRQs\n", __func__);
45
46 s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
47
48 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
49 irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
50
51 for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
52 grp->con = __raw_readl(S5P64X0_EINT12CON + (i * 4));
53 grp->mask = __raw_readl(S5P64X0_EINT12MASK + (i * 4));
54 grp->fltcon = __raw_readl(S5P64X0_EINT12FLTCON + (i * 4));
55 }
56
57 return 0;
58 }
59
s5p64x0_irq_pm_resume(void)60 static void s5p64x0_irq_pm_resume(void)
61 {
62 struct irq_grp_save *grp = eint_grp_save;
63 int i;
64
65 S3C_PMDBG("%s: resuming IRQs\n", __func__);
66
67 s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
68
69 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
70 __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
71
72 for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
73 __raw_writel(grp->con, S5P64X0_EINT12CON + (i * 4));
74 __raw_writel(grp->mask, S5P64X0_EINT12MASK + (i * 4));
75 __raw_writel(grp->fltcon, S5P64X0_EINT12FLTCON + (i * 4));
76 }
77
78 S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
79 }
80
81 static struct syscore_ops s5p64x0_irq_syscore_ops = {
82 .suspend = s5p64x0_irq_pm_suspend,
83 .resume = s5p64x0_irq_pm_resume,
84 };
85
s5p64x0_syscore_init(void)86 static int __init s5p64x0_syscore_init(void)
87 {
88 register_syscore_ops(&s5p64x0_irq_syscore_ops);
89
90 return 0;
91 }
92 core_initcall(s5p64x0_syscore_init);
93