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/sysdev.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 37static 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 49static struct irq_grp_save { 50 u32 fltcon; 51 u32 con; 52 u32 mask; 53} eint_grp_save[5]; 54 55static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS]; 56 57static int s3c64xx_irq_pm_suspend(struct sys_device *dev, pm_message_t state) 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 78static int s3c64xx_irq_pm_resume(struct sys_device *dev) 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 return 0; 98} 99 100static struct sysdev_driver s3c64xx_irq_driver = { 101 .suspend = s3c64xx_irq_pm_suspend, 102 .resume = s3c64xx_irq_pm_resume, 103}; 104 105static int __init s3c64xx_irq_pm_init(void) 106{ 107 return sysdev_driver_register(&s3c64xx_sysclass, &s3c64xx_irq_driver); 108} 109 110arch_initcall(s3c64xx_irq_pm_init); 111