1 /*
2 * Copyright 2012-15 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26 #include "dm_services.h"
27
28 #define DIVIDER 10000
29
30 /* S2D13 value in [-3.00...0.9999] */
31 #define S2D13_MIN (-3 * DIVIDER)
32 #define S2D13_MAX (3 * DIVIDER)
33
34 uint16_t fixed_point_to_int_frac(
35 struct fixed31_32 arg,
36 uint8_t integer_bits,
37 uint8_t fractional_bits)
38 {
39 int32_t numerator;
40 int32_t divisor = 1 << fractional_bits;
41
42 uint16_t result;
43
44 uint16_t d = (uint16_t)dc_fixpt_floor(
45 dc_fixpt_abs(
46 arg));
47
48 if (d <= (uint16_t)(1 << integer_bits) - (1 / (uint16_t)divisor))
49 numerator = (uint16_t)dc_fixpt_round(
50 dc_fixpt_mul_int(
51 arg,
52 divisor));
53 else {
54 numerator = dc_fixpt_floor(
55 dc_fixpt_sub(
56 dc_fixpt_from_int(
57 1LL << integer_bits),
58 dc_fixpt_recip(
59 dc_fixpt_from_int(
60 divisor))));
61 }
62
63 if (numerator >= 0)
64 result = (uint16_t)numerator;
65 else
66 result = (uint16_t)(
67 (1 << (integer_bits + fractional_bits + 1)) + numerator);
68
69 if ((result != 0) && dc_fixpt_lt(
70 arg, dc_fixpt_zero))
71 result |= 1 << (integer_bits + fractional_bits);
72
73 return result;
74 }
75 /**
76 * convert_float_matrix
77 * This converts a double into HW register spec defined format S2D13.
78 * @param :
79 * @return None
80 */
81 void convert_float_matrix(
82 uint16_t *matrix,
83 struct fixed31_32 *flt,
84 uint32_t buffer_size)
85 {
86 const struct fixed31_32 min_2_13 =
87 dc_fixpt_from_fraction(S2D13_MIN, DIVIDER);
88 const struct fixed31_32 max_2_13 =
89 dc_fixpt_from_fraction(S2D13_MAX, DIVIDER);
90 uint32_t i;
91
92 for (i = 0; i < buffer_size; ++i) {
93 uint32_t reg_value =
94 fixed_point_to_int_frac(
95 dc_fixpt_clamp(
96 flt[i],
97 min_2_13,
98 max_2_13),
99 2,
100 13);
101
102 matrix[i] = (uint16_t)reg_value;
103 }
104 }