sys/dev/drm/include/linux/jiffies.h

   1 /*
   2  * Copyright (c) 2014-2015 François Tigeot
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef _LINUX_JIFFIES_H_
  28 #define _LINUX_JIFFIES_H_
  29
  30 #include <sys/kernel.h>
  31 #include <machine/limits.h>
  32
  33 #include <linux/math64.h>
  34 #include <linux/time.h>
  35
  36 #define HZ                      hz
  37
  38 #define MAX_JIFFY_OFFSET        ((LONG_MAX >> 1) - 1)
  39
  40 #define jiffies_to_msecs(x)     (((int64_t)(x)) * 1000 / hz)
  41 #define msecs_to_jiffies(x)     (((int64_t)(x)) * hz / 1000)
  42 #define jiffies                 ticks
  43 #define jiffies_64              ticks /* XXX hmmm */
  44 #define time_after(a,b)         ((long)(b) - (long)(a) < 0)
  45 #define time_after_eq(a,b)      ((long)(b) - (long)(a) <= 0)
  46
  47 #define time_before(a,b)        time_after(b,a)
  48 #define time_before_eq(a,b)     time_after_eq(b,a)
  49
  50 #define time_in_range(a,b,c)    \
  51         time_after_eq(a,b) && time_before_eq(a,c)
  52
  53 static inline unsigned long
  54 timespec_to_jiffies(const struct timespec *ts)
  55 {
  56         unsigned long result;
  57
  58         result = ((unsigned long)hz * ts->tv_sec) + (ts->tv_nsec / NSEC_PER_SEC);
  59         if (result > LONG_MAX)
  60                 result = LONG_MAX;
  61
  62         return result;
  63 }
  64
  65 static inline
  66 unsigned long usecs_to_jiffies(const unsigned int u)
  67 {
  68         unsigned long jiffies;
  69
  70         jiffies = (u * hz) / 1000000;
  71         if (jiffies < 1)
  72                 return 1;
  73         else
  74                 return jiffies;
  75 }
  76
  77 static inline u64 get_jiffies_64(void)
  78 {
  79         return (u64)ticks;
  80 }
  81
  82 static inline u64 nsecs_to_jiffies(u64 n)
  83 {
  84         return (n * hz) / NSEC_PER_SEC;
  85 }
  86
  87 static inline u64 nsecs_to_jiffies64(u64 n)
  88 {
  89         return nsecs_to_jiffies(n);
  90 }
  91
  92 static inline
  93 unsigned int jiffies_to_usecs(const unsigned long j)
  94 {
  95         return j * (USEC_PER_SEC / HZ);
  96 }
  97
  98 #endif  /* _LINUX_JIFFIES_H_ */