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93 lines
1.8 KiB
93 lines
1.8 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2012 Regents of the University of California |
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*/ |
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#ifndef _ASM_RISCV_TIMEX_H |
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#define _ASM_RISCV_TIMEX_H |
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#include <asm/csr.h> |
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typedef unsigned long cycles_t; |
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#ifdef CONFIG_RISCV_M_MODE |
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#include <asm/clint.h> |
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#ifdef CONFIG_64BIT |
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static inline cycles_t get_cycles(void) |
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{ |
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return readq_relaxed(clint_time_val); |
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} |
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#else /* !CONFIG_64BIT */ |
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static inline u32 get_cycles(void) |
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{ |
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return readl_relaxed(((u32 *)clint_time_val)); |
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} |
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#define get_cycles get_cycles |
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static inline u32 get_cycles_hi(void) |
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{ |
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return readl_relaxed(((u32 *)clint_time_val) + 1); |
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} |
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#define get_cycles_hi get_cycles_hi |
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#endif /* CONFIG_64BIT */ |
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/* |
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* Much like MIPS, we may not have a viable counter to use at an early point |
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* in the boot process. Unfortunately we don't have a fallback, so instead |
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* we just return 0. |
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*/ |
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static inline unsigned long random_get_entropy(void) |
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{ |
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if (unlikely(clint_time_val == NULL)) |
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return 0; |
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return get_cycles(); |
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} |
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#define random_get_entropy() random_get_entropy() |
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#else /* CONFIG_RISCV_M_MODE */ |
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static inline cycles_t get_cycles(void) |
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{ |
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return csr_read(CSR_TIME); |
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} |
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#define get_cycles get_cycles |
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static inline u32 get_cycles_hi(void) |
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{ |
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return csr_read(CSR_TIMEH); |
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} |
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#define get_cycles_hi get_cycles_hi |
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#endif /* !CONFIG_RISCV_M_MODE */ |
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#ifdef CONFIG_64BIT |
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static inline u64 get_cycles64(void) |
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{ |
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return get_cycles(); |
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} |
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#else /* CONFIG_64BIT */ |
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static inline u64 get_cycles64(void) |
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{ |
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u32 hi, lo; |
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do { |
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hi = get_cycles_hi(); |
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lo = get_cycles(); |
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} while (hi != get_cycles_hi()); |
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return ((u64)hi << 32) | lo; |
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} |
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#endif /* CONFIG_64BIT */ |
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#define ARCH_HAS_READ_CURRENT_TIMER |
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static inline int read_current_timer(unsigned long *timer_val) |
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{ |
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*timer_val = get_cycles(); |
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return 0; |
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} |
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extern void time_init(void); |
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#endif /* _ASM_RISCV_TIMEX_H */
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