mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-07 03:36:16 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/lists.h>
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#include <dm/device-internal.h>
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#include <dm/root.h>
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#include <clk.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 notrace 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 notrace timer_get_rate(struct udevice *dev)
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{
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struct timer_dev_priv *uc_priv = dev->uclass_priv;
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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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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct clk timer_clk;
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int err;
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ulong ret;
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err = clk_get_by_index(dev, 0, &timer_clk);
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if (!err) {
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ret = clk_get_rate(&timer_clk);
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if (IS_ERR_VALUE(ret))
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return ret;
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uc_priv->clock_rate = ret;
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} else {
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uc_priv->clock_rate =
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dev_read_u32_default(dev, "clock-frequency", 0);
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}
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#endif
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return 0;
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}
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static int timer_post_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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if (!uc_priv->clock_rate)
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return -EINVAL;
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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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int notrace dm_timer_init(void)
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{
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struct udevice *dev = NULL;
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__maybe_unused ofnode node;
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int ret;
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if (gd->timer)
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return 0;
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/*
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* Directly access gd->dm_root to suppress error messages, if the
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* virtual root driver does not yet exist.
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*/
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if (gd->dm_root == NULL)
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return -EAGAIN;
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#if !CONFIG_IS_ENABLED(OF_PLATDATA)
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/* Check for a chosen timer to be used for tick */
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node = ofnode_get_chosen_node("tick-timer");
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if (ofnode_valid(node) &&
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uclass_get_device_by_ofnode(UCLASS_TIMER, node, &dev)) {
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/*
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* If the timer is not marked to be bound before
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* relocation, bind it anyway.
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*/
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if (!lists_bind_fdt(dm_root(), node, &dev)) {
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ret = device_probe(dev);
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if (ret)
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return ret;
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}
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}
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#endif
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if (!dev) {
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/* Fall back to the first available timer */
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ret = uclass_first_device_err(UCLASS_TIMER, &dev);
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if (ret)
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return ret;
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}
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if (dev) {
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gd->timer = dev;
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return 0;
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}
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return -ENODEV;
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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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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.post_probe = timer_post_probe,
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.per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
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};
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