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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019, Rick Chen <rick@andestech.com>
* Copyright (C) 2020, Sean Anderson <seanga2@gmail.com>
*
* U-Boot syscon driver for Andes's Platform Level Machine Timer (PLMT).
* The PLMT block holds memory-mapped mtime register
* associated with timer tick.
*/
#include <common.h>
#include <dm.h>
#include <timer.h>
#include <asm/io.h>
#include <dm/device-internal.h>
#include <linux/err.h>
/* mtime register */
#define MTIME_REG(base) ((ulong)(base))
static u64 notrace andes_plmt_get_count(struct udevice *dev)
{
return readq((void __iomem *)MTIME_REG(dev_get_priv(dev)));
}
#if CONFIG_IS_ENABLED(RISCV_MMODE) && IS_ENABLED(CONFIG_TIMER_EARLY)
/**
* timer_early_get_rate() - Get the timer rate before driver model
*/
unsigned long notrace timer_early_get_rate(void)
{
return RISCV_MMODE_TIMER_FREQ;
}
/**
* timer_early_get_count() - Get the timer count before driver model
*
*/
u64 notrace timer_early_get_count(void)
{
return readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE));
}
#endif
static const struct timer_ops andes_plmt_ops = {
.get_count = andes_plmt_get_count,
};
static int andes_plmt_probe(struct udevice *dev)
{
dev_set_priv(dev, dev_read_addr_ptr(dev));
if (!dev_get_priv(dev))
return -EINVAL;
return timer_timebase_fallback(dev);
}
static const struct udevice_id andes_plmt_ids[] = {
{ .compatible = "riscv,plmt0" },
{ }
};
U_BOOT_DRIVER(andes_plmt) = {
.name = "andes_plmt",
.id = UCLASS_TIMER,
.of_match = andes_plmt_ids,
.ops = &andes_plmt_ops,
.probe = andes_plmt_probe,
.flags = DM_FLAG_PRE_RELOC,
};
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