124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
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/*
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* Copyright 2012-15 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: AMD
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*
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*/
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#include "dm_services.h"
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#include "conversion.h"
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#define DIVIDER 10000
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/* S2D13 value in [-3.00...0.9999] */
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#define S2D13_MIN (-3 * DIVIDER)
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#define S2D13_MAX (3 * DIVIDER)
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uint16_t fixed_point_to_int_frac(
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struct fixed31_32 arg,
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uint8_t integer_bits,
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uint8_t fractional_bits)
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{
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int32_t numerator;
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int32_t divisor = 1 << fractional_bits;
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uint16_t result;
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uint16_t d = (uint16_t)dc_fixpt_floor(
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dc_fixpt_abs(
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arg));
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if (d <= (uint16_t)(1 << integer_bits) - (1 / (uint16_t)divisor))
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numerator = (uint16_t)dc_fixpt_round(
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dc_fixpt_mul_int(
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arg,
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divisor));
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else {
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numerator = dc_fixpt_floor(
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dc_fixpt_sub(
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dc_fixpt_from_int(
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1LL << integer_bits),
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dc_fixpt_recip(
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dc_fixpt_from_int(
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divisor))));
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}
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if (numerator >= 0)
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result = (uint16_t)numerator;
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else
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result = (uint16_t)(
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(1 << (integer_bits + fractional_bits + 1)) + numerator);
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if ((result != 0) && dc_fixpt_lt(
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arg, dc_fixpt_zero))
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result |= 1 << (integer_bits + fractional_bits);
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return result;
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}
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/*
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* convert_float_matrix - This converts a double into HW register spec defined format S2D13.
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*/
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void convert_float_matrix(
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uint16_t *matrix,
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struct fixed31_32 *flt,
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uint32_t buffer_size)
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{
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const struct fixed31_32 min_2_13 =
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dc_fixpt_from_fraction(S2D13_MIN, DIVIDER);
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const struct fixed31_32 max_2_13 =
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dc_fixpt_from_fraction(S2D13_MAX, DIVIDER);
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uint32_t i;
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for (i = 0; i < buffer_size; ++i) {
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uint32_t reg_value =
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fixed_point_to_int_frac(
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dc_fixpt_clamp(
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flt[i],
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min_2_13,
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max_2_13),
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2,
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13);
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matrix[i] = (uint16_t)reg_value;
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}
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}
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static uint32_t find_gcd(uint32_t a, uint32_t b)
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{
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uint32_t remainder = 0;
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while (b != 0) {
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remainder = a % b;
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a = b;
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b = remainder;
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}
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return a;
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}
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void reduce_fraction(uint32_t num, uint32_t den,
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uint32_t *out_num, uint32_t *out_den)
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{
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uint32_t gcd = 0;
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gcd = find_gcd(num, den);
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*out_num = num / gcd;
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*out_den = den / gcd;
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}
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