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
dal_i2c_engine_acquire(struct engine * engine,struct ddc * ddc_handle)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
dal_i2c_engine_setup_i2c_engine(struct i2c_engine * engine)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
dal_i2c_engine_submit_channel_request(struct i2c_engine * engine,struct i2c_request_transaction_data * request)92 void dal_i2c_engine_submit_channel_request(
93 struct i2c_engine *engine,
94 struct i2c_request_transaction_data *request)
95 {
96
97 }
98
dal_i2c_engine_process_channel_reply(struct i2c_engine * engine,struct i2c_reply_transaction_data * reply)99 void dal_i2c_engine_process_channel_reply(
100 struct i2c_engine *engine,
101 struct i2c_reply_transaction_data *reply)
102 {
103
104 }
105
dal_i2c_engine_construct(struct i2c_engine * engine,struct dc_context * ctx)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
dal_i2c_engine_destruct(struct i2c_engine * engine)114 void dal_i2c_engine_destruct(
115 struct i2c_engine *engine)
116 {
117 dal_i2caux_destruct_engine(&engine->base);
118 }
119