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timer-uclass.c

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  • Forked from Reform / reform-boundary-uboot
    18047 commits behind the upstream repository.
    timer-uclass.c 1.04 KiB
    /*
     * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
     *
     * SPDX-License-Identifier:	GPL-2.0+
     */
    
    #include <common.h>
    #include <dm.h>
    #include <errno.h>
    #include <timer.h>
    
    /*
     * Implement a Timer uclass to work with lib/time.c. The timer is usually
     * a 32 bits free-running up counter. The get_rate() method is used to get
     * the input clock frequency of the timer. The get_count() method is used
     * get the current 32 bits count value. If the hardware is counting down,
     * the value should be inversed inside the method. There may be no real
     * tick, and no timer interrupt.
     */
    
    int timer_get_count(struct udevice *dev, unsigned long *count)
    {
    	const struct timer_ops *ops = device_get_ops(dev);
    
    	if (!ops->get_count)
    		return -ENOSYS;
    
    	return ops->get_count(dev, count);
    }
    
    unsigned long timer_get_rate(struct udevice *dev)
    {
    	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
    
    	return uc_priv->clock_rate;
    }
    
    UCLASS_DRIVER(timer) = {
    	.id		= UCLASS_TIMER,
    	.name		= "timer",
    	.per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
    };