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155 lines
3.2 KiB
155 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* MPIC timer wakeup driver |
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* |
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* Copyright 2013 Freescale Semiconductor, Inc. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/errno.h> |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/device.h> |
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#include <asm/mpic_timer.h> |
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#include <asm/mpic.h> |
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struct fsl_mpic_timer_wakeup { |
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struct mpic_timer *timer; |
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struct work_struct free_work; |
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}; |
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static struct fsl_mpic_timer_wakeup *fsl_wakeup; |
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static DEFINE_MUTEX(sysfs_lock); |
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static void fsl_free_resource(struct work_struct *ws) |
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{ |
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struct fsl_mpic_timer_wakeup *wakeup = |
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container_of(ws, struct fsl_mpic_timer_wakeup, free_work); |
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mutex_lock(&sysfs_lock); |
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if (wakeup->timer) { |
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disable_irq_wake(wakeup->timer->irq); |
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mpic_free_timer(wakeup->timer); |
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} |
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wakeup->timer = NULL; |
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mutex_unlock(&sysfs_lock); |
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} |
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static irqreturn_t fsl_mpic_timer_irq(int irq, void *dev_id) |
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{ |
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struct fsl_mpic_timer_wakeup *wakeup = dev_id; |
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schedule_work(&wakeup->free_work); |
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return wakeup->timer ? IRQ_HANDLED : IRQ_NONE; |
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} |
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static ssize_t fsl_timer_wakeup_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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time64_t interval = 0; |
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mutex_lock(&sysfs_lock); |
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if (fsl_wakeup->timer) { |
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mpic_get_remain_time(fsl_wakeup->timer, &interval); |
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interval++; |
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} |
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mutex_unlock(&sysfs_lock); |
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return sprintf(buf, "%lld\n", interval); |
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} |
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static ssize_t fsl_timer_wakeup_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t count) |
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{ |
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time64_t interval; |
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int ret; |
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if (kstrtoll(buf, 0, &interval)) |
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return -EINVAL; |
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mutex_lock(&sysfs_lock); |
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if (fsl_wakeup->timer) { |
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disable_irq_wake(fsl_wakeup->timer->irq); |
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mpic_free_timer(fsl_wakeup->timer); |
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fsl_wakeup->timer = NULL; |
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} |
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if (!interval) { |
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mutex_unlock(&sysfs_lock); |
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return count; |
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} |
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fsl_wakeup->timer = mpic_request_timer(fsl_mpic_timer_irq, |
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fsl_wakeup, interval); |
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if (!fsl_wakeup->timer) { |
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mutex_unlock(&sysfs_lock); |
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return -EINVAL; |
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} |
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ret = enable_irq_wake(fsl_wakeup->timer->irq); |
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if (ret) { |
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mpic_free_timer(fsl_wakeup->timer); |
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fsl_wakeup->timer = NULL; |
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mutex_unlock(&sysfs_lock); |
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return ret; |
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} |
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mpic_start_timer(fsl_wakeup->timer); |
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mutex_unlock(&sysfs_lock); |
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return count; |
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} |
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static struct device_attribute mpic_attributes = __ATTR(timer_wakeup, 0644, |
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fsl_timer_wakeup_show, fsl_timer_wakeup_store); |
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static int __init fsl_wakeup_sys_init(void) |
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{ |
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int ret; |
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fsl_wakeup = kzalloc(sizeof(struct fsl_mpic_timer_wakeup), GFP_KERNEL); |
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if (!fsl_wakeup) |
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return -ENOMEM; |
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INIT_WORK(&fsl_wakeup->free_work, fsl_free_resource); |
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ret = device_create_file(mpic_subsys.dev_root, &mpic_attributes); |
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if (ret) |
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kfree(fsl_wakeup); |
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return ret; |
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} |
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static void __exit fsl_wakeup_sys_exit(void) |
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{ |
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device_remove_file(mpic_subsys.dev_root, &mpic_attributes); |
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mutex_lock(&sysfs_lock); |
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if (fsl_wakeup->timer) { |
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disable_irq_wake(fsl_wakeup->timer->irq); |
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mpic_free_timer(fsl_wakeup->timer); |
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} |
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kfree(fsl_wakeup); |
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mutex_unlock(&sysfs_lock); |
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} |
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module_init(fsl_wakeup_sys_init); |
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module_exit(fsl_wakeup_sys_exit); |
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MODULE_DESCRIPTION("Freescale MPIC global timer wakeup driver"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Wang Dongsheng <[email protected]>");
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