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81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
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/*
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* Copyright 2012 Freescale Semiconductor, Inc.
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* Copyright 2012 Linaro Ltd.
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/cpuidle.h>
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#include <linux/err.h>
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#include <linux/hrtimer.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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static struct cpuidle_device __percpu * imx_cpuidle_devices;
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static void __init imx_cpuidle_devices_uninit(void)
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{
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int cpu_id;
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struct cpuidle_device *dev;
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for_each_possible_cpu(cpu_id) {
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dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id);
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cpuidle_unregister_device(dev);
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}
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free_percpu(imx_cpuidle_devices);
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}
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int __init imx_cpuidle_init(struct cpuidle_driver *drv)
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{
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struct cpuidle_device *dev;
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int cpu_id, ret;
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if (drv->state_count > CPUIDLE_STATE_MAX) {
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pr_err("%s: state_count exceeds maximum\n", __func__);
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return -EINVAL;
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}
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ret = cpuidle_register_driver(drv);
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if (ret) {
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pr_err("%s: Failed to register cpuidle driver with error: %d\n",
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__func__, ret);
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return ret;
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}
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imx_cpuidle_devices = alloc_percpu(struct cpuidle_device);
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if (imx_cpuidle_devices == NULL) {
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ret = -ENOMEM;
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goto unregister_drv;
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}
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/* initialize state data for each cpuidle_device */
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for_each_possible_cpu(cpu_id) {
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dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id);
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dev->cpu = cpu_id;
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dev->state_count = drv->state_count;
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ret = cpuidle_register_device(dev);
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if (ret) {
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pr_err("%s: Failed to register cpu %u, error: %d\n",
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__func__, cpu_id, ret);
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goto uninit;
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}
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}
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return 0;
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uninit:
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imx_cpuidle_devices_uninit();
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unregister_drv:
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cpuidle_unregister_driver(drv);
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return ret;
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}
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