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 #include <linux/kernel.h>
16 #include <linux/syscore_ops.h>
17 #include <linux/interrupt.h>
18 #include <linux/serial_core.h>
19 #include <linux/irq.h>
20 #include <linux/io.h>
21
22 #include <mach/map.h>
23
24 #include <plat/regs-serial.h>
25 #include <plat/regs-timer.h>
26 #include <mach/regs-gpio.h>
27 #include <plat/cpu.h>
28 #include <plat/pm.h>
29
30 /* We handled all the IRQ types in this code, to save having to make several
31 * small files to handle each different type separately. Having the EINT_GRP
32 * code here shouldn't be as much bloat as the IRQ table space needed when
33 * they are enabled. The added benefit is we ensure that these registers are
34 * in the same state as we suspended.
35 */
36
37 static struct sleep_save irq_save[] = {
38 SAVE_ITEM(S3C64XX_PRIORITY),
39 SAVE_ITEM(S3C64XX_EINT0CON0),
40 SAVE_ITEM(S3C64XX_EINT0CON1),
41 SAVE_ITEM(S3C64XX_EINT0FLTCON0),
42 SAVE_ITEM(S3C64XX_EINT0FLTCON1),
43 SAVE_ITEM(S3C64XX_EINT0FLTCON2),
44 SAVE_ITEM(S3C64XX_EINT0FLTCON3),
45 SAVE_ITEM(S3C64XX_EINT0MASK),
46 SAVE_ITEM(S3C64XX_TINT_CSTAT),
47 };
48
49 static struct irq_grp_save {
50 u32 fltcon;
51 u32 con;
52 u32 mask;
53 } eint_grp_save[5];
54
55 static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];
56
s3c64xx_irq_pm_suspend(void)57 static int s3c64xx_irq_pm_suspend(void)
58 {
59 struct irq_grp_save *grp = eint_grp_save;
60 int i;
61
62 S3C_PMDBG("%s: suspending IRQs\n", __func__);
63
64 s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
65
66 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
67 irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
68
69 for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
70 grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
71 grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
72 grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
73 }
74
75 return 0;
76 }
77
s3c64xx_irq_pm_resume(void)78 static void s3c64xx_irq_pm_resume(void)
79 {
80 struct irq_grp_save *grp = eint_grp_save;
81 int i;
82
83 S3C_PMDBG("%s: resuming IRQs\n", __func__);
84
85 s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
86
87 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
88 __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
89
90 for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
91 __raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
92 __raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
93 __raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
94 }
95
96 S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
97 }
98
99 struct syscore_ops s3c64xx_irq_syscore_ops = {
100 .suspend = s3c64xx_irq_pm_suspend,
101 .resume = s3c64xx_irq_pm_resume,
102 };
103
s3c64xx_syscore_init(void)104 static __init int s3c64xx_syscore_init(void)
105 {
106 register_syscore_ops(&s3c64xx_irq_syscore_ops);
107
108 return 0;
109 }
110
111 core_initcall(s3c64xx_syscore_init);
112