1 /* arch/arm/plat-s3c64xx/irq-pm.c
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2008 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
8 * S3C64XX - Interrupt handling Power Management
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.
16 * NOTE: Code in this file is not used when booting with Device Tree support.
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/irq.h>
29 #include <plat/regs-serial.h>
30 #include <mach/regs-gpio.h>
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.
41 static 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),
52 static struct irq_grp_save {
58 static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];
60 static int s3c64xx_irq_pm_suspend(void)
62 struct irq_grp_save *grp = eint_grp_save;
65 S3C_PMDBG("%s: suspending IRQs\n", __func__);
67 s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
69 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
70 irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
72 for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
73 grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
74 grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
75 grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
81 static void s3c64xx_irq_pm_resume(void)
83 struct irq_grp_save *grp = eint_grp_save;
86 S3C_PMDBG("%s: resuming IRQs\n", __func__);
88 s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
90 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
91 __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
93 for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
94 __raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
95 __raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
96 __raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
99 S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
102 static struct syscore_ops s3c64xx_irq_syscore_ops = {
103 .suspend = s3c64xx_irq_pm_suspend,
104 .resume = s3c64xx_irq_pm_resume,
107 static __init int s3c64xx_syscore_init(void)
109 /* Appropriate drivers (pinctrl, uart) handle this when using DT. */
110 if (of_have_populated_dt())
113 register_syscore_ops(&s3c64xx_irq_syscore_ops);
118 core_initcall(s3c64xx_syscore_init);