arch/riscv/include/asm/timex.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  */
   5
   6 #ifndef _ASM_RISCV_TIMEX_H
   7 #define _ASM_RISCV_TIMEX_H
   8
   9 #include <asm/csr.h>
  10 #include <asm/mmio.h>
  11
  12 typedef unsigned long cycles_t;
  13
  14 extern u64 __iomem *riscv_time_val;
  15 extern u64 __iomem *riscv_time_cmp;
  16
  17 #ifdef CONFIG_64BIT
  18 #define mmio_get_cycles()       readq_relaxed(riscv_time_val)
  19 #else
  20 #define mmio_get_cycles()       readl_relaxed(riscv_time_val)
  21 #define mmio_get_cycles_hi()    readl_relaxed(((u32 *)riscv_time_val) + 1)
  22 #endif
  23
  24 static inline cycles_t get_cycles(void)
  25 {
  26         if (IS_ENABLED(CONFIG_RISCV_SBI))
  27                 return csr_read(CSR_TIME);
  28         return mmio_get_cycles();
  29 }
  30 #define get_cycles get_cycles
  31
  32 #ifdef CONFIG_64BIT
  33 static inline u64 get_cycles64(void)
  34 {
  35         return get_cycles();
  36 }
  37 #else /* CONFIG_64BIT */
  38 static inline u32 get_cycles_hi(void)
  39 {
  40         if (IS_ENABLED(CONFIG_RISCV_SBI))
  41                 return csr_read(CSR_TIMEH);
  42         return mmio_get_cycles_hi();
  43 }
  44
  45 static inline u64 get_cycles64(void)
  46 {
  47         u32 hi, lo;
  48
  49         do {
  50                 hi = get_cycles_hi();
  51                 lo = get_cycles();
  52         } while (hi != get_cycles_hi());
  53
  54         return ((u64)hi << 32) | lo;
  55 }
  56 #endif /* CONFIG_64BIT */
  57
  58 #define ARCH_HAS_READ_CURRENT_TIMER
  59 static inline int read_current_timer(unsigned long *timer_val)
  60 {
  61         *timer_val = get_cycles();
  62         return 0;
  63 }
  64
  65 #endif /* _ASM_RISCV_TIMEX_H */