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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 <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,
- };
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