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
   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