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.
15 #include <linux/kernel.h>
16 #include <linux/sysdev.h>
17 #include <linux/interrupt.h>
18 #include <linux/serial_core.h>
19 #include <linux/irq.h>
24 #include <plat/regs-serial.h>
25 #include <plat/regs-timer.h>
26 #include <plat/regs-gpio.h>
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.
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),
49 static struct irq_grp_save {
55 static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];
57 static int s3c64xx_irq_pm_suspend(struct sys_device *dev, pm_message_t state)
59 struct irq_grp_save *grp = eint_grp_save;
62 S3C_PMDBG("%s: suspending IRQs\n", __func__);
64 s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
66 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
67 irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
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));
78 static int s3c64xx_irq_pm_resume(struct sys_device *dev)
80 struct irq_grp_save *grp = eint_grp_save;
83 S3C_PMDBG("%s: resuming IRQs\n", __func__);
85 s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
87 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
88 __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
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));
96 S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
100 static struct sysdev_driver s3c64xx_irq_driver = {
101 .suspend = s3c64xx_irq_pm_suspend,
102 .resume = s3c64xx_irq_pm_resume,
105 static int __init s3c64xx_irq_pm_init(void)
107 return sysdev_driver_register(&s3c64xx_sysclass, &s3c64xx_irq_driver);
110 arch_initcall(s3c64xx_irq_pm_init);