mtk_timer.c
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// SPDX-License-Identifier: GPL-2.0
/*
* MediaTek timer driver
*
* Copyright (C) 2018 MediaTek Inc.
* Author: Ryder Lee <ryder.lee@mediatek.com>
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <timer.h>
#include <asm/io.h>
#define MTK_GPT4_CTRL 0x40
#define MTK_GPT4_CLK 0x44
#define MTK_GPT4_CNT 0x48
#define GPT4_ENABLE BIT(0)
#define GPT4_CLEAR BIT(1)
#define GPT4_FREERUN GENMASK(5, 4)
#define GPT4_CLK_SYS 0x0
#define GPT4_CLK_DIV1 0x0
struct mtk_timer_priv {
void __iomem *base;
};
static int mtk_timer_get_count(struct udevice *dev, u64 *count)
{
struct mtk_timer_priv *priv = dev_get_priv(dev);
u32 val = readl(priv->base + MTK_GPT4_CNT);
*count = timer_conv_64(val);
return 0;
}
static int mtk_timer_probe(struct udevice *dev)
{
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct mtk_timer_priv *priv = dev_get_priv(dev);
struct clk clk, parent;
int ret;
priv->base = dev_read_addr_ptr(dev);
if (!priv->base)
return -ENOENT;
ret = clk_get_by_index(dev, 0, &clk);
if (ret)
return ret;
ret = clk_get_by_index(dev, 1, &parent);
if (!ret) {
ret = clk_set_parent(&clk, &parent);
if (ret)
return ret;
}
uc_priv->clock_rate = clk_get_rate(&clk);
if (!uc_priv->clock_rate)
return -EINVAL;
return 0;
}
static const struct timer_ops mtk_timer_ops = {
.get_count = mtk_timer_get_count,
};
static const struct udevice_id mtk_timer_ids[] = {
{ .compatible = "mediatek,timer" },
{ }
};
U_BOOT_DRIVER(mtk_timer) = {
.name = "mtk_timer",
.id = UCLASS_TIMER,
.of_match = mtk_timer_ids,
.priv_auto_alloc_size = sizeof(struct mtk_timer_priv),
.probe = mtk_timer_probe,
.ops = &mtk_timer_ops,
.flags = DM_FLAG_PRE_RELOC,
};