From d930596a3c093bf3f4fbf24f10ad0d8372d6ac21 Mon Sep 17 00:00:00 2001 From: Changhwan Youn Date: Fri, 3 Dec 2010 17:14:57 +0900 Subject: [PATCH] ARM: SAMSUNG: Add support for Power Domain control This patch implements Power Domain control based on Runtime PM framework. Each Power Domain is represented by a Power Domain device and the devices belong to these Power Domains should be set as a child device of the Power Domain devices. The corresponding drivers of the devices should implement Runtime PM to control the Power Domains. Signed-off-by: Changhwan Youn Signed-off-by: Kukjin Kim --- arch/arm/plat-samsung/Kconfig | 8 +++ arch/arm/plat-samsung/Makefile | 4 ++ arch/arm/plat-samsung/include/plat/pd.h | 30 ++++++++ arch/arm/plat-samsung/pd.c | 95 +++++++++++++++++++++++++ 4 files changed, 137 insertions(+) create mode 100644 arch/arm/plat-samsung/include/plat/pd.h create mode 100644 arch/arm/plat-samsung/pd.c diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig index dcd6eff4ee53..2ebf4157d93a 100644 --- a/arch/arm/plat-samsung/Kconfig +++ b/arch/arm/plat-samsung/Kconfig @@ -333,4 +333,12 @@ config SAMSUNG_WAKEMASK and above. This code allows a set of interrupt to wakeup-mask mappings. See +comment "Power Domain" + +config SAMSUNG_PD + bool "Samsung Power Domain" + depends on PM_RUNTIME + help + Say Y here if you want to control Power Domain by Runtime PM. + endif diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile index afcce474af8e..09dbd78b56f5 100644 --- a/arch/arm/plat-samsung/Makefile +++ b/arch/arm/plat-samsung/Makefile @@ -73,6 +73,10 @@ obj-$(CONFIG_SAMSUNG_PM_CHECK) += pm-check.o obj-$(CONFIG_SAMSUNG_WAKEMASK) += wakeup-mask.o +# PD support + +obj-$(CONFIG_SAMSUNG_PD) += pd.o + # PWM support obj-$(CONFIG_HAVE_PWM) += pwm.o diff --git a/arch/arm/plat-samsung/include/plat/pd.h b/arch/arm/plat-samsung/include/plat/pd.h new file mode 100644 index 000000000000..5f0ad85783db --- /dev/null +++ b/arch/arm/plat-samsung/include/plat/pd.h @@ -0,0 +1,30 @@ +/* linux/arch/arm/plat-samsung/include/plat/pd.h + * + * Copyright (c) 2010 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * 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. +*/ + +#ifndef __ASM_PLAT_SAMSUNG_PD_H +#define __ASM_PLAT_SAMSUNG_PD_H __FILE__ + +struct samsung_pd_info { + int (*enable)(struct device *dev); + int (*disable)(struct device *dev); + void __iomem *base; +}; + +enum s5pv310_pd_block { + PD_MFC, + PD_G3D, + PD_LCD0, + PD_LCD1, + PD_TV, + PD_CAM, + PD_GPS +}; + +#endif /* __ASM_PLAT_SAMSUNG_PD_H */ diff --git a/arch/arm/plat-samsung/pd.c b/arch/arm/plat-samsung/pd.c new file mode 100644 index 000000000000..efe1d564473e --- /dev/null +++ b/arch/arm/plat-samsung/pd.c @@ -0,0 +1,95 @@ +/* linux/arch/arm/plat-samsung/pd.c + * + * Copyright (c) 2010 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Samsung Power domain 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 + +static int samsung_pd_probe(struct platform_device *pdev) +{ + struct samsung_pd_info *pdata = pdev->dev.platform_data; + struct device *dev = &pdev->dev; + + if (!pdata) { + dev_err(dev, "no device data specified\n"); + return -ENOENT; + } + + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + dev_info(dev, "power domain registered\n"); + return 0; +} + +static int __devexit samsung_pd_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + + pm_runtime_disable(dev); + return 0; +} + +static int samsung_pd_runtime_suspend(struct device *dev) +{ + struct samsung_pd_info *pdata = dev->platform_data; + int ret = 0; + + if (pdata->disable) + ret = pdata->disable(dev); + + dev_dbg(dev, "suspended\n"); + return ret; +} + +static int samsung_pd_runtime_resume(struct device *dev) +{ + struct samsung_pd_info *pdata = dev->platform_data; + int ret = 0; + + if (pdata->enable) + ret = pdata->enable(dev); + + dev_dbg(dev, "resumed\n"); + return ret; +} + +static const struct dev_pm_ops samsung_pd_pm_ops = { + .runtime_suspend = samsung_pd_runtime_suspend, + .runtime_resume = samsung_pd_runtime_resume, +}; + +static struct platform_driver samsung_pd_driver = { + .driver = { + .name = "samsung-pd", + .owner = THIS_MODULE, + .pm = &samsung_pd_pm_ops, + }, + .probe = samsung_pd_probe, + .remove = __devexit_p(samsung_pd_remove), +}; + +static int __init samsung_pd_init(void) +{ + int ret; + + ret = platform_driver_register(&samsung_pd_driver); + if (ret) + printk(KERN_ERR "%s: failed to add PD driver\n", __func__); + + return ret; +} +arch_initcall(samsung_pd_init); -- 2.39.5