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)
32struct 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
42static 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
48static 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
54static 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(arg1: bw_min2(arg1: v1, arg2: v2), arg2: v3);
59}
60
61static 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(arg1: bw_max2(arg1: v1, arg2: v2), arg2: v3);
66}
67
68struct bw_fixed bw_int_to_fixed_nonconst(int64_t value);
69static 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
80static inline int32_t bw_fixed_to_int(struct bw_fixed value)
81{
82 return BW_FIXED_GET_INTEGER_PART(value.value);
83}
84
85struct bw_fixed bw_frc_to_fixed(int64_t num, int64_t denum);
86
87static 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
101static 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
111static 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
120struct bw_fixed bw_mul(const struct bw_fixed arg1, const struct bw_fixed arg2);
121static inline struct bw_fixed bw_div(const struct bw_fixed arg1, const struct bw_fixed arg2)
122{
123 return bw_frc_to_fixed(num: arg1.value, denum: arg2.value);
124}
125
126static 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(dividend: arg1.value, divisor: arg2.value, remainder: (uint64_t *)&res.value);
130 return res;
131}
132
133struct bw_fixed bw_floor2(const struct bw_fixed arg, const struct bw_fixed significance);
134struct bw_fixed bw_ceil2(const struct bw_fixed arg, const struct bw_fixed significance);
135
136static inline bool bw_equ(const struct bw_fixed arg1, const struct bw_fixed arg2)
137{
138 return arg1.value == arg2.value;
139}
140
141static inline bool bw_neq(const struct bw_fixed arg1, const struct bw_fixed arg2)
142{
143 return arg1.value != arg2.value;
144}
145
146static inline bool bw_leq(const struct bw_fixed arg1, const struct bw_fixed arg2)
147{
148 return arg1.value <= arg2.value;
149}
150
151static inline bool bw_meq(const struct bw_fixed arg1, const struct bw_fixed arg2)
152{
153 return arg1.value >= arg2.value;
154}
155
156static inline bool bw_ltn(const struct bw_fixed arg1, const struct bw_fixed arg2)
157{
158 return arg1.value < arg2.value;
159}
160
161static 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_
167

source code of linux/drivers/gpu/drm/amd/display/dc/inc/bw_fixed.h