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(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
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(val.val, mul.val);
92	tmp = tmp >> 16;
93
94	return clamp_u64_to_fixed16(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(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(val, mul.val);
123
124	return clamp_u64_to_fixed16(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(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(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