1 /* $NetBSD: i915_fixed.h,v 1.2 2021/12/18 23:45:28 riastradh Exp $ */ 2 3 /* SPDX-License-Identifier: MIT */ 4 /* 5 * Copyright 2018 Intel Corporation 6 */ 7 8 #ifndef _I915_FIXED_H_ 9 #define _I915_FIXED_H_ 10 11 #include <linux/bug.h> 12 #include <linux/kernel.h> 13 #include <linux/math64.h> 14 #include <linux/types.h> 15 16 typedef struct { 17 u32 val; 18 } uint_fixed_16_16_t; 19 20 #define FP_16_16_MAX ((uint_fixed_16_16_t){ .val = UINT_MAX }) 21 22 static inline bool is_fixed16_zero(uint_fixed_16_16_t val) 23 { 24 return val.val == 0; 25 } 26 27 static inline uint_fixed_16_16_t u32_to_fixed16(u32 val) 28 { 29 uint_fixed_16_16_t fp = { .val = val << 16 }; 30 31 WARN_ON(val > U16_MAX); 32 33 return fp; 34 } 35 36 static inline u32 fixed16_to_u32_round_up(uint_fixed_16_16_t fp) 37 { 38 return DIV_ROUND_UP(fp.val, 1 << 16); 39 } 40 41 static inline u32 fixed16_to_u32(uint_fixed_16_16_t fp) 42 { 43 return fp.val >> 16; 44 } 45 46 static inline uint_fixed_16_16_t min_fixed16(uint_fixed_16_16_t min1, 47 uint_fixed_16_16_t min2) 48 { 49 uint_fixed_16_16_t min = { .val = min(min1.val, min2.val) }; 50 51 return min; 52 } 53 54 static inline uint_fixed_16_16_t max_fixed16(uint_fixed_16_16_t max1, 55 uint_fixed_16_16_t max2) 56 { 57 uint_fixed_16_16_t max = { .val = max(max1.val, max2.val) }; 58 59 return max; 60 } 61 62 static inline uint_fixed_16_16_t clamp_u64_to_fixed16(u64 val) 63 { 64 uint_fixed_16_16_t fp = { .val = (u32)val }; 65 66 WARN_ON(val > U32_MAX); 67 68 return fp; 69 } 70 71 static inline u32 div_round_up_fixed16(uint_fixed_16_16_t val, 72 uint_fixed_16_16_t d) 73 { 74 return DIV_ROUND_UP(val.val, d.val); 75 } 76 77 static inline u32 mul_round_up_u32_fixed16(u32 val, uint_fixed_16_16_t mul) 78 { 79 u64 tmp; 80 81 tmp = mul_u32_u32(val, mul.val); 82 tmp = DIV_ROUND_UP_ULL(tmp, 1 << 16); 83 WARN_ON(tmp > U32_MAX); 84 85 return (u32)tmp; 86 } 87 88 static inline uint_fixed_16_16_t mul_fixed16(uint_fixed_16_16_t val, 89 uint_fixed_16_16_t mul) 90 { 91 u64 tmp; 92 93 tmp = mul_u32_u32(val.val, mul.val); 94 tmp = tmp >> 16; 95 96 return clamp_u64_to_fixed16(tmp); 97 } 98 99 static inline uint_fixed_16_16_t div_fixed16(u32 val, u32 d) 100 { 101 u64 tmp; 102 103 tmp = (u64)val << 16; 104 tmp = DIV_ROUND_UP_ULL(tmp, d); 105 106 return clamp_u64_to_fixed16(tmp); 107 } 108 109 static inline u32 div_round_up_u32_fixed16(u32 val, uint_fixed_16_16_t d) 110 { 111 u64 tmp; 112 113 tmp = (u64)val << 16; 114 tmp = DIV_ROUND_UP_ULL(tmp, d.val); 115 WARN_ON(tmp > U32_MAX); 116 117 return (u32)tmp; 118 } 119 120 static inline uint_fixed_16_16_t mul_u32_fixed16(u32 val, uint_fixed_16_16_t mul) 121 { 122 u64 tmp; 123 124 tmp = mul_u32_u32(val, mul.val); 125 126 return clamp_u64_to_fixed16(tmp); 127 } 128 129 static inline uint_fixed_16_16_t add_fixed16(uint_fixed_16_16_t add1, 130 uint_fixed_16_16_t add2) 131 { 132 u64 tmp; 133 134 tmp = (u64)add1.val + add2.val; 135 136 return clamp_u64_to_fixed16(tmp); 137 } 138 139 static inline uint_fixed_16_16_t add_fixed16_u32(uint_fixed_16_16_t add1, 140 u32 add2) 141 { 142 uint_fixed_16_16_t tmp_add2 = u32_to_fixed16(add2); 143 u64 tmp; 144 145 tmp = (u64)add1.val + tmp_add2.val; 146 147 return clamp_u64_to_fixed16(tmp); 148 } 149 150 #endif /* _I915_FIXED_H_ */ 151