1 /* 2 * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <timer.h> 11 12 /* 13 * Implement a Timer uclass to work with lib/time.c. The timer is usually 14 * a 32 bits free-running up counter. The get_rate() method is used to get 15 * the input clock frequency of the timer. The get_count() method is used 16 * get the current 32 bits count value. If the hardware is counting down, 17 * the value should be inversed inside the method. There may be no real 18 * tick, and no timer interrupt. 19 */ 20 21 int timer_get_count(struct udevice *dev, unsigned long *count) 22 { 23 const struct timer_ops *ops = device_get_ops(dev); 24 25 if (!ops->get_count) 26 return -ENOSYS; 27 28 return ops->get_count(dev, count); 29 } 30 31 unsigned long timer_get_rate(struct udevice *dev) 32 { 33 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); 34 35 return uc_priv->clock_rate; 36 } 37 38 UCLASS_DRIVER(timer) = { 39 .id = UCLASS_TIMER, 40 .name = "timer", 41 .per_device_auto_alloc_size = sizeof(struct timer_dev_priv), 42 }; 43