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 } 105