Thomas Chou | fb798b1 | 2015-10-09 13:46:34 +0800 | [diff] [blame] | 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 | }; |