There is really nothing SH-mobile specific about this runtime PM implementation. Any platform wanting to implement runtime PM based on simple clock gating can use this implementation.
Signed-off-by: Kevin Hilman <[email protected]> --- arch/arm/common/Makefile | 1 + arch/arm/common/pm_runtime_clock.c | 176 ++++++++++++++++++++++++++++++++++ arch/arm/include/asm/pm_runtime.h | 17 ++++ arch/arm/mach-shmobile/pm_runtime.c | 179 ----------------------------------- 4 files changed, 194 insertions(+), 179 deletions(-) create mode 100644 arch/arm/common/pm_runtime_clock.c create mode 100644 arch/arm/include/asm/pm_runtime.h delete mode 100644 arch/arm/mach-shmobile/pm_runtime.c diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile index e7521bca..efa79c7 100644 --- a/arch/arm/common/Makefile +++ b/arch/arm/common/Makefile @@ -18,3 +18,4 @@ obj-$(CONFIG_ARCH_IXP23XX) += uengine.o obj-$(CONFIG_PCI_HOST_ITE8152) += it8152.o obj-$(CONFIG_COMMON_CLKDEV) += clkdev.o obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o +obj-$(CONFIG_PM_RUNTIME) += pm_runtime_clock.o diff --git a/arch/arm/common/pm_runtime_clock.c b/arch/arm/common/pm_runtime_clock.c new file mode 100644 index 0000000..453fc95 --- /dev/null +++ b/arch/arm/common/pm_runtime_clock.c @@ -0,0 +1,176 @@ +/* + * Generic Runtime PM support code for managing device clocks + * + * Copyright (C) 2009-2010 Magnus Damm + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/pm_runtime.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/bitmap.h> +#include <linux/err.h> + +#ifdef CONFIG_PM_RUNTIME +#define BIT_ONCE 0 +#define BIT_ACTIVE 1 +#define BIT_CLK_ENABLED 2 + +struct pm_runtime_data { + unsigned long flags; + struct clk *clk; +}; + +static void __devres_release(struct device *dev, void *res) +{ + struct pm_runtime_data *prd = res; + + dev_dbg(dev, "__devres_release()\n"); + + if (test_bit(BIT_CLK_ENABLED, &prd->flags)) + clk_disable(prd->clk); + + if (test_bit(BIT_ACTIVE, &prd->flags)) + clk_put(prd->clk); +} + +static struct pm_runtime_data *__to_prd(struct device *dev) +{ + return devres_find(dev, __devres_release, NULL, NULL); +} + +static void platform_pm_runtime_init(struct device *dev, + struct pm_runtime_data *prd) +{ + if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags)) { + prd->clk = clk_get(dev, NULL); + if (!IS_ERR(prd->clk)) { + set_bit(BIT_ACTIVE, &prd->flags); + dev_info(dev, "clocks managed by runtime pm\n"); + } + } +} + +static void platform_pm_runtime_bug(struct device *dev, + struct pm_runtime_data *prd) +{ + if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags)) + dev_err(dev, "runtime pm suspend before resume\n"); +} + +static int platform_pm_runtime_suspend(struct device *dev) +{ + struct pm_runtime_data *prd = __to_prd(dev); + + dev_dbg(dev, "platform_pm_runtime_suspend()\n"); + + platform_pm_runtime_bug(dev, prd); + + if (prd && test_bit(BIT_ACTIVE, &prd->flags)) { + clk_disable(prd->clk); + clear_bit(BIT_CLK_ENABLED, &prd->flags); + } + + return 0; +} + +static int platform_pm_runtime_resume(struct device *dev) +{ + struct pm_runtime_data *prd = __to_prd(dev); + + dev_dbg(dev, "platform_pm_runtime_resume()\n"); + + platform_pm_runtime_init(dev, prd); + + if (prd && test_bit(BIT_ACTIVE, &prd->flags)) { + clk_enable(prd->clk); + set_bit(BIT_CLK_ENABLED, &prd->flags); + } + + return 0; +} + +static int platform_pm_runtime_idle(struct device *dev) +{ + /* suspend synchronously to disable clocks immediately */ + return pm_runtime_suspend(dev); +} + +static struct dev_power_domain platform_pm_power_domain = { + .ops = { + .runtime_suspend = platform_pm_runtime_suspend, + .runtime_resume = platform_pm_runtime_resume, + .runtime_idle = platform_pm_runtime_idle, + }, +}; + +static int platform_bus_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + struct pm_runtime_data *prd; + + dev_dbg(dev, "platform_bus_notify() %ld !\n", action); + + if (action == BUS_NOTIFY_BIND_DRIVER) { + prd = devres_alloc(__devres_release, sizeof(*prd), GFP_KERNEL); + if (prd) { + devres_add(dev, prd); + dev->pwr_domain = &platform_pm_power_domain; + } else { + dev_err(dev, "unable to alloc memory for runtime pm\n"); + } + } + + return 0; +} + +#else /* CONFIG_PM_RUNTIME */ + +static int platform_bus_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + struct clk *clk; + + dev_dbg(dev, "platform_bus_notify() %ld !\n", action); + + switch (action) { + case BUS_NOTIFY_BIND_DRIVER: + clk = clk_get(dev, NULL); + if (!IS_ERR(clk)) { + clk_enable(clk); + clk_put(clk); + dev_info(dev, "runtime pm disabled, clock forced on\n"); + } + break; + case BUS_NOTIFY_UNBOUND_DRIVER: + clk = clk_get(dev, NULL); + if (!IS_ERR(clk)) { + clk_disable(clk); + clk_put(clk); + dev_info(dev, "runtime pm disabled, clock forced off\n"); + } + break; + } + + return 0; +} + +#endif /* CONFIG_PM_RUNTIME */ + +static struct notifier_block platform_bus_notifier = { + .notifier_call = platform_bus_notify +}; + +int __init pm_runtime_clock_init(void) +{ + bus_register_notifier(&platform_bus_type, &platform_bus_notifier); + return 0; +} diff --git a/arch/arm/include/asm/pm_runtime.h b/arch/arm/include/asm/pm_runtime.h new file mode 100644 index 0000000..0c54b07 --- /dev/null +++ b/arch/arm/include/asm/pm_runtime.h @@ -0,0 +1,17 @@ +/* + * ARM common runtime PM definitions/prototypes + * + * Author: Kevin Hilman + * + * Copyright (C) 2010 Texas Instruments, Inc. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ +#ifndef __ASM_PM_RUNTIME_H__ +#define __ASM_PM_RUNTIME_H__ + +int __init pm_runtime_clock_init(void); + +#endif /* __ASM_PM_RUNTIME_H__ */ diff --git a/arch/arm/mach-shmobile/pm_runtime.c b/arch/arm/mach-shmobile/pm_runtime.c deleted file mode 100644 index 6c75c3f..0000000 --- a/arch/arm/mach-shmobile/pm_runtime.c +++ /dev/null @@ -1,179 +0,0 @@ -/* - * arch/arm/mach-shmobile/pm_runtime.c - * - * Runtime PM support code for SuperH Mobile ARM - * - * Copyright (C) 2009-2010 Magnus Damm - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/io.h> -#include <linux/pm_runtime.h> -#include <linux/platform_device.h> -#include <linux/clk.h> -#include <linux/sh_clk.h> -#include <linux/bitmap.h> - -#ifdef CONFIG_PM_RUNTIME -#define BIT_ONCE 0 -#define BIT_ACTIVE 1 -#define BIT_CLK_ENABLED 2 - -struct pm_runtime_data { - unsigned long flags; - struct clk *clk; -}; - -static void __devres_release(struct device *dev, void *res) -{ - struct pm_runtime_data *prd = res; - - dev_dbg(dev, "__devres_release()\n"); - - if (test_bit(BIT_CLK_ENABLED, &prd->flags)) - clk_disable(prd->clk); - - if (test_bit(BIT_ACTIVE, &prd->flags)) - clk_put(prd->clk); -} - -static struct pm_runtime_data *__to_prd(struct device *dev) -{ - return devres_find(dev, __devres_release, NULL, NULL); -} - -static void platform_pm_runtime_init(struct device *dev, - struct pm_runtime_data *prd) -{ - if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags)) { - prd->clk = clk_get(dev, NULL); - if (!IS_ERR(prd->clk)) { - set_bit(BIT_ACTIVE, &prd->flags); - dev_info(dev, "clocks managed by runtime pm\n"); - } - } -} - -static void platform_pm_runtime_bug(struct device *dev, - struct pm_runtime_data *prd) -{ - if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags)) - dev_err(dev, "runtime pm suspend before resume\n"); -} - -static int platform_pm_runtime_suspend(struct device *dev) -{ - struct pm_runtime_data *prd = __to_prd(dev); - - dev_dbg(dev, "platform_pm_runtime_suspend()\n"); - - platform_pm_runtime_bug(dev, prd); - - if (prd && test_bit(BIT_ACTIVE, &prd->flags)) { - clk_disable(prd->clk); - clear_bit(BIT_CLK_ENABLED, &prd->flags); - } - - return 0; -} - -static int platform_pm_runtime_resume(struct device *dev) -{ - struct pm_runtime_data *prd = __to_prd(dev); - - dev_dbg(dev, "platform_pm_runtime_resume()\n"); - - platform_pm_runtime_init(dev, prd); - - if (prd && test_bit(BIT_ACTIVE, &prd->flags)) { - clk_enable(prd->clk); - set_bit(BIT_CLK_ENABLED, &prd->flags); - } - - return 0; -} - -static int platform_pm_runtime_idle(struct device *dev) -{ - /* suspend synchronously to disable clocks immediately */ - return pm_runtime_suspend(dev); -} - -static struct dev_power_domain platform_pm_power_domain = { - .ops = { - .runtime_suspend = platform_pm_runtime_suspend, - .runtime_resume = platform_pm_runtime_resume, - .runtime_idle = platform_pm_runtime_idle, - }, -}; - -static int platform_bus_notify(struct notifier_block *nb, - unsigned long action, void *data) -{ - struct device *dev = data; - struct pm_runtime_data *prd; - - dev_dbg(dev, "platform_bus_notify() %ld !\n", action); - - if (action == BUS_NOTIFY_BIND_DRIVER) { - prd = devres_alloc(__devres_release, sizeof(*prd), GFP_KERNEL); - if (prd) { - devres_add(dev, prd); - dev->pwr_domain = &platform_pm_power_domain; - } else { - dev_err(dev, "unable to alloc memory for runtime pm\n"); - } - } - - return 0; -} - -#else /* CONFIG_PM_RUNTIME */ - -static int platform_bus_notify(struct notifier_block *nb, - unsigned long action, void *data) -{ - struct device *dev = data; - struct clk *clk; - - dev_dbg(dev, "platform_bus_notify() %ld !\n", action); - - switch (action) { - case BUS_NOTIFY_BIND_DRIVER: - clk = clk_get(dev, NULL); - if (!IS_ERR(clk)) { - clk_enable(clk); - clk_put(clk); - dev_info(dev, "runtime pm disabled, clock forced on\n"); - } - break; - case BUS_NOTIFY_UNBOUND_DRIVER: - clk = clk_get(dev, NULL); - if (!IS_ERR(clk)) { - clk_disable(clk); - clk_put(clk); - dev_info(dev, "runtime pm disabled, clock forced off\n"); - } - break; - } - - return 0; -} - -#endif /* CONFIG_PM_RUNTIME */ - -static struct notifier_block platform_bus_notifier = { - .notifier_call = platform_bus_notify -}; - -static int __init sh_pm_runtime_init(void) -{ - bus_register_notifier(&platform_bus_type, &platform_bus_notifier); - return 0; -} -core_initcall(sh_pm_runtime_init); -- 1.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
