diff options
Diffstat (limited to 'drivers/timer/andes_plmt_timer.c')
-rw-r--r-- | drivers/timer/andes_plmt_timer.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/timer/andes_plmt_timer.c b/drivers/timer/andes_plmt_timer.c new file mode 100644 index 0000000000..cec86718c7 --- /dev/null +++ b/drivers/timer/andes_plmt_timer.c @@ -0,0 +1,50 @@ +// 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, +}; |