LXR linux/drivers/gpu/drm/i915/i915

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