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 #include "conversion.h" 29 30 #define DIVIDER 10000 31 32 /* S2D13 value in [-3.00...0.9999] */ 33 #define S2D13_MIN (-3 * DIVIDER) 34 #define S2D13_MAX (3 * DIVIDER) 35 36 uint16_t fixed_point_to_int_frac( 37 struct fixed31_32 arg, 38 uint8_t integer_bits, 39 uint8_t fractional_bits) 40 { 41 int32_t numerator; 42 int32_t divisor = 1 << fractional_bits; 43 44 uint16_t result; 45 46 uint16_t d = (uint16_t)dc_fixpt_floor( 47 dc_fixpt_abs( 48 arg)); 49 50 if (d <= (uint16_t)(1 << integer_bits) - (1 / (uint16_t)divisor)) 51 numerator = (uint16_t)dc_fixpt_round( 52 dc_fixpt_mul_int( 53 arg, 54 divisor)); 55 else { 56 numerator = dc_fixpt_floor( 57 dc_fixpt_sub( 58 dc_fixpt_from_int( 59 1LL << integer_bits), 60 dc_fixpt_recip( 61 dc_fixpt_from_int( 62 divisor)))); 63 } 64 65 if (numerator >= 0) 66 result = (uint16_t)numerator; 67 else 68 result = (uint16_t)( 69 (1 << (integer_bits + fractional_bits + 1)) + numerator); 70 71 if ((result != 0) && dc_fixpt_lt( 72 arg, dc_fixpt_zero)) 73 result |= 1 << (integer_bits + fractional_bits); 74 75 return result; 76 } 77 /** 78 * convert_float_matrix 79 * This converts a double into HW register spec defined format S2D13. 80 * @param : 81 * @return None 82 */ 83 void convert_float_matrix( 84 uint16_t *matrix, 85 struct fixed31_32 *flt, 86 uint32_t buffer_size) 87 { 88 const struct fixed31_32 min_2_13 = 89 dc_fixpt_from_fraction(S2D13_MIN, DIVIDER); 90 const struct fixed31_32 max_2_13 = 91 dc_fixpt_from_fraction(S2D13_MAX, DIVIDER); 92 uint32_t i; 93 94 for (i = 0; i < buffer_size; ++i) { 95 uint32_t reg_value = 96 fixed_point_to_int_frac( 97 dc_fixpt_clamp( 98 flt[i], 99 min_2_13, 100 max_2_13), 101 2, 102 13); 103 104 matrix[i] = (uint16_t)reg_value; 105 } 106 } 107