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 #include "conversion.h" 28 29 #define DIVIDER 10000 30 31 /* S2D13 value in [-3.00...0.9999] */ 32 #define S2D13_MIN (-3 * DIVIDER) 33 #define S2D13_MAX (3 * DIVIDER) 34 35 uint16_t fixed_point_to_int_frac( 36 struct fixed31_32 arg, 37 uint8_t integer_bits, 38 uint8_t fractional_bits) 39 { 40 int32_t numerator; 41 int32_t divisor = 1 << fractional_bits; 42 43 uint16_t result; 44 45 uint16_t d = (uint16_t)dc_fixpt_floor( 46 dc_fixpt_abs( 47 arg)); 48 49 if (d <= (uint16_t)(1 << integer_bits) - (1 / (uint16_t)divisor)) 50 numerator = (uint16_t)dc_fixpt_round( 51 dc_fixpt_mul_int( 52 arg, 53 divisor)); 54 else { 55 numerator = dc_fixpt_floor( 56 dc_fixpt_sub( 57 dc_fixpt_from_int( 58 1LL << integer_bits), 59 dc_fixpt_recip( 60 dc_fixpt_from_int( 61 divisor)))); 62 } 63 64 if (numerator >= 0) 65 result = (uint16_t)numerator; 66 else 67 result = (uint16_t)( 68 (1 << (integer_bits + fractional_bits + 1)) + numerator); 69 70 if ((result != 0) && dc_fixpt_lt( 71 arg, dc_fixpt_zero)) 72 result |= 1 << (integer_bits + fractional_bits); 73 74 return result; 75 } 76 /* 77 * convert_float_matrix - This converts a double into HW register spec defined format S2D13. 78 */ 79 void convert_float_matrix( 80 uint16_t *matrix, 81 struct fixed31_32 *flt, 82 uint32_t buffer_size) 83 { 84 const struct fixed31_32 min_2_13 = 85 dc_fixpt_from_fraction(S2D13_MIN, DIVIDER); 86 const struct fixed31_32 max_2_13 = 87 dc_fixpt_from_fraction(S2D13_MAX, DIVIDER); 88 uint32_t i; 89 90 for (i = 0; i < buffer_size; ++i) { 91 uint32_t reg_value = 92 fixed_point_to_int_frac( 93 dc_fixpt_clamp( 94 flt[i], 95 min_2_13, 96 max_2_13), 97 2, 98 13); 99 100 matrix[i] = (uint16_t)reg_value; 101 } 102 } 103