1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2020 Google, Inc 4 */ 5 6 #ifndef _ASM_RISCV_CLINT_H 7 #define _ASM_RISCV_CLINT_H 8 9 #include <linux/types.h> 10 #include <asm/mmio.h> 11 12 #ifdef CONFIG_RISCV_M_MODE 13 /* 14 * This lives in the CLINT driver, but is accessed directly by timex.h to avoid 15 * any overhead when accessing the MMIO timer. 16 * 17 * The ISA defines mtime as a 64-bit memory-mapped register that increments at 18 * a constant frequency, but it doesn't define some other constraints we depend 19 * on (most notably ordering constraints, but also some simpler stuff like the 20 * memory layout). Thus, this is called "clint_time_val" instead of something 21 * like "riscv_mtime", to signify that these non-ISA assumptions must hold. 22 */ 23 extern u64 __iomem *clint_time_val; 24 #endif 25 26 #endif 27
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