drivers/gpu/drm/amd/display/dc/inc/bw_fixed.h

   1 /*
   2  * Copyright 2015 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: AMD
  23  *
  24  */
  25
  26 #ifndef BW_FIXED_H_
  27 #define BW_FIXED_H_
  28
  29 #define BW_FIXED_BITS_PER_FRACTIONAL_PART 24
  30
  31 #define BW_FIXED_GET_INTEGER_PART(x) ((x) >> BW_FIXED_BITS_PER_FRACTIONAL_PART)
  32 struct bw_fixed {
  33         int64_t value;
  34 };
  35
  36 #define BW_FIXED_MIN_I32 \
  37         (int64_t)(-(1LL << (63 - BW_FIXED_BITS_PER_FRACTIONAL_PART)))
  38
  39 #define BW_FIXED_MAX_I32 \
  40         (int64_t)((1ULL << (63 - BW_FIXED_BITS_PER_FRACTIONAL_PART)) - 1)
  41
  42 static inline struct bw_fixed bw_min2(const struct bw_fixed arg1,
  43                                       const struct bw_fixed arg2)
  44 {
  45         return (arg1.value <= arg2.value) ? arg1 : arg2;
  46 }
  47
  48 static inline struct bw_fixed bw_max2(const struct bw_fixed arg1,
  49                                       const struct bw_fixed arg2)
  50 {
  51         return (arg2.value <= arg1.value) ? arg1 : arg2;
  52 }
  53
  54 static inline struct bw_fixed bw_min3(struct bw_fixed v1,
  55                                       struct bw_fixed v2,
  56                                       struct bw_fixed v3)
  57 {
  58         return bw_min2(bw_min2(v1, v2), v3);
  59 }
  60
  61 static inline struct bw_fixed bw_max3(struct bw_fixed v1,
  62                                       struct bw_fixed v2,
  63                                       struct bw_fixed v3)
  64 {
  65         return bw_max2(bw_max2(v1, v2), v3);
  66 }
  67
  68 struct bw_fixed bw_int_to_fixed_nonconst(int64_t value);
  69 static inline struct bw_fixed bw_int_to_fixed(int64_t value)
  70 {
  71         if (__builtin_constant_p(value)) {
  72                 struct bw_fixed res;
  73                 BUILD_BUG_ON(value > BW_FIXED_MAX_I32 || value < BW_FIXED_MIN_I32);
  74                 res.value = value << BW_FIXED_BITS_PER_FRACTIONAL_PART;
  75                 return res;
  76         } else
  77                 return bw_int_to_fixed_nonconst(value);
  78 }
  79
  80 static inline int32_t bw_fixed_to_int(struct bw_fixed value)
  81 {
  82         return BW_FIXED_GET_INTEGER_PART(value.value);
  83 }
  84
  85 struct bw_fixed bw_frc_to_fixed(int64_t num, int64_t denum);
  86
  87 static inline struct bw_fixed fixed31_32_to_bw_fixed(int64_t raw)
  88 {
  89         struct bw_fixed result = { 0 };
  90
  91         if (raw < 0) {
  92                 raw = -raw;
  93                 result.value = -(raw >> (32 - BW_FIXED_BITS_PER_FRACTIONAL_PART));
  94         } else {
  95                 result.value = raw >> (32 - BW_FIXED_BITS_PER_FRACTIONAL_PART);
  96         }
  97
  98         return result;
  99 }
 100
 101 static inline struct bw_fixed bw_add(const struct bw_fixed arg1,
 102                                      const struct bw_fixed arg2)
 103 {
 104         struct bw_fixed res;
 105
 106         res.value = arg1.value + arg2.value;
 107
 108         return res;
 109 }
 110
 111 static inline struct bw_fixed bw_sub(const struct bw_fixed arg1, const struct bw_fixed arg2)
 112 {
 113         struct bw_fixed res;
 114
 115         res.value = arg1.value - arg2.value;
 116
 117         return res;
 118 }
 119
 120 struct bw_fixed bw_mul(const struct bw_fixed arg1, const struct bw_fixed arg2);
 121 static inline struct bw_fixed bw_div(const struct bw_fixed arg1, const struct bw_fixed arg2)
 122 {
 123         return bw_frc_to_fixed(arg1.value, arg2.value);
 124 }
 125
 126 static inline struct bw_fixed bw_mod(const struct bw_fixed arg1, const struct bw_fixed arg2)
 127 {
 128         struct bw_fixed res;
 129         div64_u64_rem(arg1.value, arg2.value, (uint64_t *)&res.value);
 130         return res;
 131 }
 132
 133 struct bw_fixed bw_floor2(const struct bw_fixed arg, const struct bw_fixed significance);
 134 struct bw_fixed bw_ceil2(const struct bw_fixed arg, const struct bw_fixed significance);
 135
 136 static inline bool bw_equ(const struct bw_fixed arg1, const struct bw_fixed arg2)
 137 {
 138         return arg1.value == arg2.value;
 139 }
 140
 141 static inline bool bw_neq(const struct bw_fixed arg1, const struct bw_fixed arg2)
 142 {
 143         return arg1.value != arg2.value;
 144 }
 145
 146 static inline bool bw_leq(const struct bw_fixed arg1, const struct bw_fixed arg2)
 147 {
 148         return arg1.value <= arg2.value;
 149 }
 150
 151 static inline bool bw_meq(const struct bw_fixed arg1, const struct bw_fixed arg2)
 152 {
 153         return arg1.value >= arg2.value;
 154 }
 155
 156 static inline bool bw_ltn(const struct bw_fixed arg1, const struct bw_fixed arg2)
 157 {
 158         return arg1.value < arg2.value;
 159 }
 160
 161 static inline bool bw_mtn(const struct bw_fixed arg1, const struct bw_fixed arg2)
 162 {
 163         return arg1.value > arg2.value;
 164 }
 165
 166 #endif //BW_FIXED_H_