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