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
14 typedef 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
is_fixed16_zero(uint_fixed_16_16_t val)20 static inline bool is_fixed16_zero(uint_fixed_16_16_t val)
21 {
22 return val.val == 0;
23 }
24
u32_to_fixed16(u32 val)25 static 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
fixed16_to_u32_round_up(uint_fixed_16_16_t fp)34 static 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
fixed16_to_u32(uint_fixed_16_16_t fp)39 static inline u32 fixed16_to_u32(uint_fixed_16_16_t fp)
40 {
41 return fp.val >> 16;
42 }
43
min_fixed16(uint_fixed_16_16_t min1,uint_fixed_16_16_t min2)44 static 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
max_fixed16(uint_fixed_16_16_t max1,uint_fixed_16_16_t max2)52 static 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
clamp_u64_to_fixed16(u64 val)60 static 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
div_round_up_fixed16(uint_fixed_16_16_t val,uint_fixed_16_16_t d)69 static 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
mul_round_up_u32_fixed16(u32 val,uint_fixed_16_16_t mul)75 static 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(val, mul.val);
80 tmp = DIV_ROUND_UP_ULL(tmp, 1 << 16);
81 WARN_ON(tmp > U32_MAX);
82
83 return (u32)tmp;
84 }
85
mul_fixed16(uint_fixed_16_16_t val,uint_fixed_16_16_t mul)86 static 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(val.val, mul.val);
92 tmp = tmp >> 16;
93
94 return clamp_u64_to_fixed16(tmp);
95 }
96
div_fixed16(u32 val,u32 d)97 static 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(tmp);
105 }
106
div_round_up_u32_fixed16(u32 val,uint_fixed_16_16_t d)107 static 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
mul_u32_fixed16(u32 val,uint_fixed_16_16_t mul)118 static 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(val, mul.val);
123
124 return clamp_u64_to_fixed16(tmp);
125 }
126
add_fixed16(uint_fixed_16_16_t add1,uint_fixed_16_16_t add2)127 static 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(tmp);
135 }
136
add_fixed16_u32(uint_fixed_16_16_t add1,u32 add2)137 static 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(add2);
141 u64 tmp;
142
143 tmp = (u64)add1.val + tmp_add2.val;
144
145 return clamp_u64_to_fixed16(tmp);
146 }
147
148 #endif /* _I915_FIXED_H_ */
149