diff options
author | Kevin Hilman <khilman@deeprootsystems.com> | 2009-11-05 19:06:01 -0800 |
---|---|---|
committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-09-21 11:51:23 -0700 |
commit | 57e6fe7b888e17f814bd35b7700ded51aa9a6a83 (patch) | |
tree | d5d733675b5a6e7985814e572e129b4c3b94a754 /arch/arm/mach-omap2/pm_bus.c | |
parent | b30a3f6257ed2105259b404d419b4964e363928c (diff) | |
download | op-kernel-dev-57e6fe7b888e17f814bd35b7700ded51aa9a6a83.zip op-kernel-dev-57e6fe7b888e17f814bd35b7700ded51aa9a6a83.tar.gz |
OMAP2+: PM: initial runtime PM core support
Implement the new runtime PM framework as a thin layer on top of the
omap_device API. OMAP specific runtime PM methods are registered with
the as custom methods on the platform_bus.
In order to determine if a device is an omap_device, its parent device
is checked. All omap_devices have a new 'omap_device_parent_ device
as their parent device, so checking for this parent is used to check
for valid omap_devices. If a device is an omap_device, then the
appropriate omap_device functions are called for it. If not, only the
generic runtime PM functions are called.
Device driver's ->runtime_idle() hook is called when the runtime PM
usecount reaches zero for that device. Driver's ->runtime_suspend()
hooks are called just before the device is disabled (via
omap_device_idle()), and device driver ->runtime_resume() hooks are
called just after device has been enabled (via omap_device_enable().)
OMAP4 build support from Rajendra Nayak <rnayak@ti.com>.
OMAP2 build support from Charulatha V <charu@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Charulatha V <charu@ti.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm/mach-omap2/pm_bus.c')
-rw-r--r-- | arch/arm/mach-omap2/pm_bus.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pm_bus.c b/arch/arm/mach-omap2/pm_bus.c new file mode 100644 index 0000000..784989f --- /dev/null +++ b/arch/arm/mach-omap2/pm_bus.c @@ -0,0 +1,85 @@ +/* + * Runtime PM support code for OMAP + * + * Author: Kevin Hilman, Deep Root Systems, LLC + * + * 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. + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/pm_runtime.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> + +#include <plat/omap_device.h> +#include <plat/omap-pm.h> + +#ifdef CONFIG_PM_RUNTIME +int omap_pm_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + int r, ret = 0; + + dev_dbg(dev, "%s\n", __func__); + + ret = pm_generic_runtime_suspend(dev); + + if (!ret && dev->parent == &omap_device_parent) { + r = omap_device_idle(pdev); + WARN_ON(r); + } + + return ret; +}; + +int omap_pm_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + int r; + + dev_dbg(dev, "%s\n", __func__); + + if (dev->parent == &omap_device_parent) { + r = omap_device_enable(pdev); + WARN_ON(r); + } + + return pm_generic_runtime_resume(dev); +}; +#else +#define omap_pm_runtime_suspend NULL +#define omap_pm_runtime_resume NULL +#endif /* CONFIG_PM_RUNTIME */ + +static int __init omap_pm_runtime_init(void) +{ + const struct dev_pm_ops *pm; + struct dev_pm_ops *omap_pm; + + pm = platform_bus_get_pm_ops(); + if (!pm) { + pr_err("%s: unable to get dev_pm_ops from platform_bus\n", + __func__); + return -ENODEV; + } + + omap_pm = kmemdup(pm, sizeof(struct dev_pm_ops), GFP_KERNEL); + if (!omap_pm) { + pr_err("%s: unable to alloc memory for new dev_pm_ops\n", + __func__); + return -ENOMEM; + } + + omap_pm->runtime_suspend = omap_pm_runtime_suspend; + omap_pm->runtime_resume = omap_pm_runtime_resume; + + platform_bus_set_pm_ops(omap_pm); + + return 0; +} +core_initcall(omap_pm_runtime_init); |