| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2020 Google, Inc |
| */ |
| |
| #ifndef _ASM_RISCV_CLINT_H |
| #define _ASM_RISCV_CLINT_H |
| |
| #include <linux/types.h> |
| #include <asm/mmio.h> |
| |
| #ifdef CONFIG_RISCV_M_MODE |
| /* |
| * This lives in the CLINT driver, but is accessed directly by timex.h to avoid |
| * any overhead when accessing the MMIO timer. |
| * |
| * The ISA defines mtime as a 64-bit memory-mapped register that increments at |
| * a constant frequency, but it doesn't define some other constraints we depend |
| * on (most notably ordering constraints, but also some simpler stuff like the |
| * memory layout). Thus, this is called "clint_time_val" instead of something |
| * like "riscv_mtime", to signify that these non-ISA assumptions must hold. |
| */ |
| extern u64 __iomem *clint_time_val; |
| #endif |
| |
| #endif |
