123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2019, Rick Chen <rick@andestech.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 <regmap.h>
- #include <syscon.h>
- #include <asm/io.h>
- #include <asm/syscon.h>
- #include <linux/err.h>
- /* mtime register */
- #define MTIME_REG(base) ((ulong)(base))
- DECLARE_GLOBAL_DATA_PTR;
- #define PLMT_BASE_GET(void) \
- do { \
- long *ret; \
- \
- if (!gd->arch.plmt) { \
- ret = syscon_get_first_range(RISCV_SYSCON_PLMT); \
- if (IS_ERR(ret)) \
- return PTR_ERR(ret); \
- gd->arch.plmt = ret; \
- } \
- } while (0)
- int riscv_get_time(u64 *time)
- {
- PLMT_BASE_GET();
- *time = readq((void __iomem *)MTIME_REG(gd->arch.plmt));
- return 0;
- }
- static const struct udevice_id andes_plmt_ids[] = {
- { .compatible = "riscv,plmt0", .data = RISCV_SYSCON_PLMT },
- { }
- };
- U_BOOT_DRIVER(andes_plmt) = {
- .name = "andes_plmt",
- .id = UCLASS_SYSCON,
- .of_match = andes_plmt_ids,
- .flags = DM_FLAG_PRE_RELOC,
- };
|