1 /* $NetBSD: i2caux_interface.h,v 1.2 2021/12/18 23:45:07 riastradh Exp $ */ 2 3 /* 4 * Copyright 2012-15 Advanced Micro Devices, Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: AMD 25 * 26 */ 27 28 #ifndef __DAL_I2CAUX_INTERFACE_H__ 29 #define __DAL_I2CAUX_INTERFACE_H__ 30 31 #include "dc_types.h" 32 #include "gpio_service_interface.h" 33 34 35 #define DEFAULT_AUX_MAX_DATA_SIZE 16 36 #define AUX_MAX_DEFER_WRITE_RETRY 20 37 38 struct aux_payload { 39 /* set following flag to read/write I2C data, 40 * reset it to read/write DPCD data */ 41 bool i2c_over_aux; 42 /* set following flag to write data, 43 * reset it to read data */ 44 bool write; 45 bool mot; 46 uint32_t address; 47 uint32_t length; 48 uint8_t *data; 49 /* 50 * used to return the reply type of the transaction 51 * ignored if NULL 52 */ 53 uint8_t *reply; 54 /* expressed in milliseconds 55 * zero means "use default value" 56 */ 57 uint32_t defer_delay; 58 }; 59 60 struct aux_command { 61 struct aux_payload *payloads; 62 uint8_t number_of_payloads; 63 64 /* expressed in milliseconds 65 * zero means "use default value" */ 66 uint32_t defer_delay; 67 68 /* zero means "use default value" */ 69 uint32_t max_defer_write_retry; 70 71 enum i2c_mot_mode mot; 72 }; 73 74 union aux_config { 75 struct { 76 uint32_t ALLOW_AUX_WHEN_HPD_LOW:1; 77 } bits; 78 uint32_t raw; 79 }; 80 81 #endif 82