1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright © 2018 Intel Corporation
4 */
5
6#ifndef _I915_FIXED_H_
7#define _I915_FIXED_H_
8
9#include <linux/bug.h>
10#include <linux/kernel.h>
11#include <linux/math64.h>
12#include <linux/types.h>
13
14typedef struct {
15 u32 val;
16} uint_fixed_16_16_t;
17
18#define FP_16_16_MAX ((uint_fixed_16_16_t){ .val = UINT_MAX })
19
20static inline bool is_fixed16_zero(uint_fixed_16_16_t val)
21{
22 return val.val == 0;
23}
24
25static inline uint_fixed_16_16_t u32_to_fixed16(u32 val)
26{
27 uint_fixed_16_16_t fp = { .val = val << 16 };
28
29 WARN_ON(val > U16_MAX);
30
31 return fp;
32}
33
34static inline u32 fixed16_to_u32_round_up(uint_fixed_16_16_t fp)
35{
36 return DIV_ROUND_UP(fp.val, 1 << 16);
37}
38
39static inline u32 fixed16_to_u32(uint_fixed_16_16_t fp)
40{
41 return fp.val >> 16;
42}
43
44static inline uint_fixed_16_16_t min_fixed16(uint_fixed_16_16_t min1,
45 uint_fixed_16_16_t min2)
46{
47 uint_fixed_16_16_t min = { .val = min(min1.val, min2.val) };
48
49 return min;
50}
51
52static inline uint_fixed_16_16_t max_fixed16(uint_fixed_16_16_t max1,
53 uint_fixed_16_16_t max2)
54{
55 uint_fixed_16_16_t max = { .val = max(max1.val, max2.val) };
56
57 return max;
58}
59
60static inline uint_fixed_16_16_t clamp_u64_to_fixed16(u64 val)
61{
62 uint_fixed_16_16_t fp = { .val = (u32)val };
63
64 WARN_ON(val > U32_MAX);
65
66 return fp;
67}
68
69static inline u32 div_round_up_fixed16(uint_fixed_16_16_t val,
70 uint_fixed_16_16_t d)
71{
72 return DIV_ROUND_UP(val.val, d.val);
73}
74
75static inline u32 mul_round_up_u32_fixed16(u32 val, uint_fixed_16_16_t mul)
76{
77 u64 tmp;
78
79 tmp = mul_u32_u32(a: val, b: mul.val);
80 tmp = DIV_ROUND_UP_ULL(tmp, 1 << 16);
81 WARN_ON(tmp > U32_MAX);
82
83 return (u32)tmp;
84}
85
86static inline uint_fixed_16_16_t mul_fixed16(uint_fixed_16_16_t val,
87 uint_fixed_16_16_t mul)
88{
89 u64 tmp;
90
91 tmp = mul_u32_u32(a: val.val, b: mul.val);
92 tmp = tmp >> 16;
93
94 return clamp_u64_to_fixed16(val: tmp);
95}
96
97static inline uint_fixed_16_16_t div_fixed16(u32 val, u32 d)
98{
99 u64 tmp;
100
101 tmp = (u64)val << 16;
102 tmp = DIV_ROUND_UP_ULL(tmp, d);
103
104 return clamp_u64_to_fixed16(val: tmp);
105}
106
107static inline u32 div_round_up_u32_fixed16(u32 val, uint_fixed_16_16_t d)
108{
109 u64 tmp;
110
111 tmp = (u64)val << 16;
112 tmp = DIV_ROUND_UP_ULL(tmp, d.val);
113 WARN_ON(tmp > U32_MAX);
114
115 return (u32)tmp;
116}
117
118static inline uint_fixed_16_16_t mul_u32_fixed16(u32 val, uint_fixed_16_16_t mul)
119{
120 u64 tmp;
121
122 tmp = mul_u32_u32(a: val, b: mul.val);
123
124 return clamp_u64_to_fixed16(val: tmp);
125}
126
127static inline uint_fixed_16_16_t add_fixed16(uint_fixed_16_16_t add1,
128 uint_fixed_16_16_t add2)
129{
130 u64 tmp;
131
132 tmp = (u64)add1.val + add2.val;
133
134 return clamp_u64_to_fixed16(val: tmp);
135}
136
137static inline uint_fixed_16_16_t add_fixed16_u32(uint_fixed_16_16_t add1,
138 u32 add2)
139{
140 uint_fixed_16_16_t tmp_add2 = u32_to_fixed16(val: add2);
141 u64 tmp;
142
143 tmp = (u64)add1.val + tmp_add2.val;
144
145 return clamp_u64_to_fixed16(val: tmp);
146}
147
148#endif /* _I915_FIXED_H_ */
149