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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2022 StarFive, Inc. All rights reserved.
* Author: Kuan Lim Lee <kuanlim.lee@starfivetech.com>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <time.h>
#include <timer.h>
#include <asm/io.h>
#include <dm/device-internal.h>
#include <linux/err.h>
#define STF_TIMER_INT_STATUS 0x00
#define STF_TIMER_CTL 0x04
#define STF_TIMER_LOAD 0x08
#define STF_TIMER_ENABLE 0x10
#define STF_TIMER_RELOAD 0x14
#define STF_TIMER_VALUE 0x18
#define STF_TIMER_INT_CLR 0x20
#define STF_TIMER_INT_MASK 0x24
struct starfive_timer_priv {
void __iomem *base;
u32 timer_size;
};
static u64 notrace starfive_get_count(struct udevice *dev)
{
struct starfive_timer_priv *priv = dev_get_priv(dev);
/* Read decrement timer value and convert to increment value */
return priv->timer_size - readl(priv->base + STF_TIMER_VALUE);
}
static const struct timer_ops starfive_ops = {
.get_count = starfive_get_count,
};
static int starfive_probe(struct udevice *dev)
{
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct starfive_timer_priv *priv = dev_get_priv(dev);
int timer_channel;
struct clk clk;
int ret;
priv->base = dev_read_addr_ptr(dev);
if (!priv->base)
return -EINVAL;
timer_channel = dev_read_u32_default(dev, "channel", 0);
priv->base = priv->base + (0x40 * timer_channel);
/* Get clock rate from channel selectecd*/
ret = clk_get_by_index(dev, timer_channel, &clk);
if (ret)
return ret;
ret = clk_enable(&clk);
if (ret)
return ret;
uc_priv->clock_rate = clk_get_rate(&clk);
/*
* Initiate timer, channel 0
* Unmask Interrupt Mask
*/
writel(0, priv->base + STF_TIMER_INT_MASK);
/* Single run mode Setting */
if (dev_read_bool(dev, "single-run"))
writel(1, priv->base + STF_TIMER_CTL);
/* Set Reload value */
priv->timer_size = dev_read_u32_default(dev, "timer-size", -1U);
writel(priv->timer_size, priv->base + STF_TIMER_LOAD);
/* Enable to start timer */
writel(1, priv->base + STF_TIMER_ENABLE);
return 0;
}
static const struct udevice_id starfive_ids[] = {
{ .compatible = "starfive,jh8100-timers" },
{ }
};
U_BOOT_DRIVER(jh8100_starfive_timer) = {
.name = "starfive_timer",
.id = UCLASS_TIMER,
.of_match = starfive_ids,
.probe = starfive_probe,
.ops = &starfive_ops,
.priv_auto = sizeof(struct starfive_timer_priv),
};
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