1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/*
* Copyright 2012-15 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#include "dm_services.h"
#include "basics/conversion.h"
#define DIVIDER 10000
/* S2D13 value in [-3.00...0.9999] */
#define S2D13_MIN (-3 * DIVIDER)
#define S2D13_MAX (3 * DIVIDER)
uint16_t fixed_point_to_int_frac(
struct fixed31_32 arg,
uint8_t integer_bits,
uint8_t fractional_bits)
{
int32_t numerator;
int32_t divisor = 1 << fractional_bits;
uint16_t result;
uint16_t d = (uint16_t)dc_fixpt_floor(
dc_fixpt_abs(
arg));
if (d <= (uint16_t)(1 << integer_bits) - (1 / (uint16_t)divisor))
numerator = (uint16_t)dc_fixpt_round(
dc_fixpt_mul_int(
arg,
divisor));
else {
numerator = dc_fixpt_floor(
dc_fixpt_sub(
dc_fixpt_from_int(
1LL << integer_bits),
dc_fixpt_recip(
dc_fixpt_from_int(
divisor))));
}
if (numerator >= 0)
result = (uint16_t)numerator;
else
result = (uint16_t)(
(1 << (integer_bits + fractional_bits + 1)) + numerator);
if ((result != 0) && dc_fixpt_lt(
arg, dc_fixpt_zero))
result |= 1 << (integer_bits + fractional_bits);
return result;
}
/*
* convert_float_matrix - This converts a double into HW register spec defined format S2D13.
*/
void convert_float_matrix(
uint16_t *matrix,
struct fixed31_32 *flt,
uint32_t buffer_size)
{
const struct fixed31_32 min_2_13 =
dc_fixpt_from_fraction(S2D13_MIN, DIVIDER);
const struct fixed31_32 max_2_13 =
dc_fixpt_from_fraction(S2D13_MAX, DIVIDER);
uint32_t i;
for (i = 0; i < buffer_size; ++i) {
uint32_t reg_value =
fixed_point_to_int_frac(
dc_fixpt_clamp(
flt[i],
min_2_13,
max_2_13),
2,
13);
matrix[i] = (uint16_t)reg_value;
}
}
static struct fixed31_32 int_frac_to_fixed_point(uint16_t arg,
uint8_t integer_bits,
uint8_t fractional_bits)
{
struct fixed31_32 result;
uint16_t sign_mask = 1 << (fractional_bits + integer_bits);
uint16_t value_mask = sign_mask - 1;
result.value = (long long)(arg & value_mask) <<
(FIXED31_32_BITS_PER_FRACTIONAL_PART - fractional_bits);
if (arg & sign_mask)
result = dc_fixpt_neg(result);
return result;
}
/**
* convert_hw_matrix - converts HW values into fixed31_32 matrix.
* @matrix: fixed point 31.32 matrix
* @reg: array of register values
* @buffer_size: size of the array of register values
*
* Converts HW register spec defined format S2D13 into a fixed-point 31.32
* matrix.
*/
void convert_hw_matrix(struct fixed31_32 *matrix,
uint16_t *reg,
uint32_t buffer_size)
{
for (int i = 0; i < buffer_size; ++i)
matrix[i] = int_frac_to_fixed_point(reg[i], 2, 13);
}
static uint32_t find_gcd(uint32_t a, uint32_t b)
{
uint32_t remainder;
while (b != 0) {
remainder = a % b;
a = b;
b = remainder;
}
return a;
}
void reduce_fraction(uint32_t num, uint32_t den,
uint32_t *out_num, uint32_t *out_den)
{
uint32_t gcd = 0;
gcd = find_gcd(num, den);
*out_num = num / gcd;
*out_den = den / gcd;
}
|
