u-boot/drivers/timer/andes_plmt_timer.c
Sean Anderson 79b135f1f9 riscv: Move Andes PLMT driver to drivers/timer
This is a regular timer driver, and should live with the other timer
drivers.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Rick Chen <rick@andestech.com>
2020-10-26 10:01:28 +08:00

50 lines
1.1 KiB
C

// 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 <linux/err.h>
/* mtime register */
#define MTIME_REG(base) ((ulong)(base))
static u64 andes_plmt_get_count(struct udevice *dev)
{
return readq((void __iomem *)MTIME_REG(dev->priv));
}
static const struct timer_ops andes_plmt_ops = {
.get_count = andes_plmt_get_count,
};
static int andes_plmt_probe(struct udevice *dev)
{
dev->priv = dev_read_addr_ptr(dev);
if (!dev->priv)
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,
};