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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| /* | ||
| * 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"); | ||
| } | ||
|
|
||
| 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; | ||
| } | ||
|
|
||
| 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; | ||
| } | ||
|
|
||
| int platform_pm_runtime_idle(struct device *dev) | ||
| { | ||
| /* suspend synchronously to disable clocks immediately */ | ||
| return pm_runtime_suspend(dev); | ||
| } | ||
|
|
||
| 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); | ||
| 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); |