From 6436b6a7a64f946c5a5f3d8a8c0e6404e2bda8d5 Mon Sep 17 00:00:00 2001 From: Abhilash Kesavan Date: Wed, 20 Oct 2010 19:43:35 +0900 Subject: [PATCH] ARM: S3C2416: Add Power Management support for SMDK2416 Adds suspend-to-ram support for SMDK2416 based on existing 2412 PM code Signed-off-by: Abhilash Kesavan Signed-off-by: Sangbeom Kim Signed-off-by: Kukjin Kim --- .../include/mach/regs-s3c2443-clock.h | 2 + arch/arm/mach-s3c2416/Kconfig | 6 ++ arch/arm/mach-s3c2416/Makefile | 2 +- arch/arm/mach-s3c2416/irq.c | 2 + arch/arm/mach-s3c2416/pm.c | 84 +++++++++++++++++++ 5 files changed, 95 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-s3c2416/pm.c diff --git a/arch/arm/mach-s3c2410/include/mach/regs-s3c2443-clock.h b/arch/arm/mach-s3c2410/include/mach/regs-s3c2443-clock.h index 08ab9dfb6ae6..101aeea22310 100644 --- a/arch/arm/mach-s3c2410/include/mach/regs-s3c2443-clock.h +++ b/arch/arm/mach-s3c2410/include/mach/regs-s3c2443-clock.h @@ -118,6 +118,8 @@ #define S3C2443_SCLKCON_UARTCLK (1<<8) #define S3C2443_SCLKCON_USBHOST (1<<1) +#define S3C2443_PWRCFG_SLEEP (1<<15) + #include static inline unsigned int diff --git a/arch/arm/mach-s3c2416/Kconfig b/arch/arm/mach-s3c2416/Kconfig index 657e4fe17f39..87b9c9f003bd 100644 --- a/arch/arm/mach-s3c2416/Kconfig +++ b/arch/arm/mach-s3c2416/Kconfig @@ -25,6 +25,11 @@ config S3C2416_DMA help Internal config node for S3C2416 DMA support +config S3C2416_PM + bool + help + Internal config node to apply S3C2416 power management + menu "S3C2416 Machines" config MACH_SMDK2416 @@ -33,6 +38,7 @@ config MACH_SMDK2416 select S3C_DEV_FB select S3C_DEV_HSMMC select S3C_DEV_HSMMC1 + select S3C2416_PM if PM help Say Y here if you are using an SMDK2416 diff --git a/arch/arm/mach-s3c2416/Makefile b/arch/arm/mach-s3c2416/Makefile index 6c12c7bf40ad..ef038d62ffdb 100644 --- a/arch/arm/mach-s3c2416/Makefile +++ b/arch/arm/mach-s3c2416/Makefile @@ -11,7 +11,7 @@ obj- := obj-$(CONFIG_CPU_S3C2416) += s3c2416.o clock.o obj-$(CONFIG_CPU_S3C2416) += irq.o - +obj-$(CONFIG_S3C2416_PM) += pm.o #obj-$(CONFIG_S3C2416_DMA) += dma.o # Machine support diff --git a/arch/arm/mach-s3c2416/irq.c b/arch/arm/mach-s3c2416/irq.c index 89f521d59d06..084d121f368c 100644 --- a/arch/arm/mach-s3c2416/irq.c +++ b/arch/arm/mach-s3c2416/irq.c @@ -243,6 +243,8 @@ static int __init s3c2416_irq_add(struct sys_device *sysdev) static struct sysdev_driver s3c2416_irq_driver = { .add = s3c2416_irq_add, + .suspend = s3c24xx_irq_suspend, + .resume = s3c24xx_irq_resume, }; static int __init s3c2416_irq_init(void) diff --git a/arch/arm/mach-s3c2416/pm.c b/arch/arm/mach-s3c2416/pm.c new file mode 100644 index 000000000000..4a04205b04d5 --- /dev/null +++ b/arch/arm/mach-s3c2416/pm.c @@ -0,0 +1,84 @@ +/* linux/arch/arm/mach-s3c2416/pm.c + * + * Copyright (c) 2010 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * S3C2416 - PM support (Based on Ben Dooks' S3C2412 PM support) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include +#include + +#include + +#include +#include + +#include +#include + +extern void s3c2412_sleep_enter(void); + +static void s3c2416_cpu_suspend(void) +{ + flush_cache_all(); + + /* enable wakeup sources regardless of battery state */ + __raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG); + + /* set the mode as sleep, 2BED represents "Go to BED" */ + __raw_writel(0x2BED, S3C2443_PWRMODE); + + s3c2412_sleep_enter(); +} + +static void s3c2416_pm_prepare(void) +{ + /* + * write the magic value u-boot uses to check for resume into + * the INFORM0 register, and ensure INFORM1 is set to the + * correct address to resume from. + */ + __raw_writel(0x2BED, S3C2412_INFORM0); + __raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1); +} + +static int s3c2416_pm_add(struct sys_device *sysdev) +{ + pm_cpu_prep = s3c2416_pm_prepare; + pm_cpu_sleep = s3c2416_cpu_suspend; + + return 0; +} + +static int s3c2416_pm_suspend(struct sys_device *dev, pm_message_t state) +{ + return 0; +} + +static int s3c2416_pm_resume(struct sys_device *dev) +{ + /* unset the return-from-sleep amd inform flags */ + __raw_writel(0x0, S3C2443_PWRMODE); + __raw_writel(0x0, S3C2412_INFORM0); + __raw_writel(0x0, S3C2412_INFORM1); + + return 0; +} + +static struct sysdev_driver s3c2416_pm_driver = { + .add = s3c2416_pm_add, + .suspend = s3c2416_pm_suspend, + .resume = s3c2416_pm_resume, +}; + +static __init int s3c2416_pm_init(void) +{ + return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver); +} + +arch_initcall(s3c2416_pm_init); -- GitLab