57e6fe7b88
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>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/*
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* Runtime PM support code for OMAP
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*
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* Author: Kevin Hilman, Deep Root Systems, LLC
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*
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* Copyright (C) 2010 Texas Instruments, Inc.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/pm_runtime.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <plat/omap_device.h>
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#include <plat/omap-pm.h>
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#ifdef CONFIG_PM_RUNTIME
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int omap_pm_runtime_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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int r, ret = 0;
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dev_dbg(dev, "%s\n", __func__);
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ret = pm_generic_runtime_suspend(dev);
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if (!ret && dev->parent == &omap_device_parent) {
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r = omap_device_idle(pdev);
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WARN_ON(r);
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}
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return ret;
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};
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int omap_pm_runtime_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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int r;
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dev_dbg(dev, "%s\n", __func__);
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if (dev->parent == &omap_device_parent) {
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r = omap_device_enable(pdev);
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WARN_ON(r);
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}
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return pm_generic_runtime_resume(dev);
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};
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#else
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#define omap_pm_runtime_suspend NULL
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#define omap_pm_runtime_resume NULL
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#endif /* CONFIG_PM_RUNTIME */
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static int __init omap_pm_runtime_init(void)
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{
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const struct dev_pm_ops *pm;
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struct dev_pm_ops *omap_pm;
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pm = platform_bus_get_pm_ops();
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if (!pm) {
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pr_err("%s: unable to get dev_pm_ops from platform_bus\n",
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__func__);
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return -ENODEV;
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}
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omap_pm = kmemdup(pm, sizeof(struct dev_pm_ops), GFP_KERNEL);
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if (!omap_pm) {
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pr_err("%s: unable to alloc memory for new dev_pm_ops\n",
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__func__);
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return -ENOMEM;
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}
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omap_pm->runtime_suspend = omap_pm_runtime_suspend;
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omap_pm->runtime_resume = omap_pm_runtime_resume;
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platform_bus_set_pm_ops(omap_pm);
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return 0;
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}
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core_initcall(omap_pm_runtime_init);
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