65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
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* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <timer.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Implement a timer uclass to work with lib/time.c. The timer is usually
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* a 32/64 bits free-running up counter. The get_rate() method is used to get
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* the input clock frequency of the timer. The get_count() method is used
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* to get the current 64 bits count value. If the hardware is counting down,
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* the value should be inversed inside the method. There may be no real
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* tick, and no timer interrupt.
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*/
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int timer_get_count(struct udevice *dev, u64 *count)
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{
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const struct timer_ops *ops = device_get_ops(dev);
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if (!ops->get_count)
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return -ENOSYS;
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return ops->get_count(dev, count);
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}
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unsigned long timer_get_rate(struct udevice *dev)
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{
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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return uc_priv->clock_rate;
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}
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static int timer_pre_probe(struct udevice *dev)
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{
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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uc_priv->clock_rate = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
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"clock-frequency", 0);
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return 0;
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}
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u64 timer_conv_64(u32 count)
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{
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/* increment tbh if tbl has rolled over */
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if (count < gd->timebase_l)
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gd->timebase_h++;
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gd->timebase_l = count;
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return ((u64)gd->timebase_h << 32) | gd->timebase_l;
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}
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UCLASS_DRIVER(timer) = {
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.id = UCLASS_TIMER,
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.name = "timer",
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.pre_probe = timer_pre_probe,
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.per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
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};
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