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 /* 29 * Pre-requisites: headers required by header of this unit 30 */ 31 #include "include/i2caux_interface.h" 32 #include "engine.h" 33 34 /* 35 * Header of this unit 36 */ 37 38 #include "i2c_engine.h" 39 40 /* 41 * Post-requisites: headers required by this unit 42 */ 43 44 /* 45 * This unit 46 */ 47 48 #define FROM_ENGINE(ptr) \ 49 container_of((ptr), struct i2c_engine, base) 50 51 bool dal_i2c_engine_acquire( 52 struct engine *engine, 53 struct ddc *ddc_handle) 54 { 55 struct i2c_engine *i2c_engine = FROM_ENGINE(engine); 56 57 uint32_t counter = 0; 58 bool result; 59 60 do { 61 result = i2c_engine->funcs->acquire_engine( 62 i2c_engine, ddc_handle); 63 64 if (result) 65 break; 66 67 /* i2c_engine is busy by VBios, lets wait and retry */ 68 69 udelay(10); 70 71 ++counter; 72 } while (counter < 2); 73 74 if (result) { 75 if (!i2c_engine->funcs->setup_engine(i2c_engine)) { 76 engine->funcs->release_engine(engine); 77 result = false; 78 } 79 } 80 81 return result; 82 } 83 84 bool dal_i2c_engine_setup_i2c_engine( 85 struct i2c_engine *engine) 86 { 87 /* Derivative classes do not have to override this */ 88 89 return true; 90 } 91 92 void dal_i2c_engine_submit_channel_request( 93 struct i2c_engine *engine, 94 struct i2c_request_transaction_data *request) 95 { 96 97 } 98 99 void dal_i2c_engine_process_channel_reply( 100 struct i2c_engine *engine, 101 struct i2c_reply_transaction_data *reply) 102 { 103 104 } 105 106 void dal_i2c_engine_construct( 107 struct i2c_engine *engine, 108 struct dc_context *ctx) 109 { 110 dal_i2caux_construct_engine(&engine->base, ctx); 111 engine->timeout_delay = 0; 112 } 113 114 void dal_i2c_engine_destruct( 115 struct i2c_engine *engine) 116 { 117 dal_i2caux_destruct_engine(&engine->base); 118 } 119