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 #ifndef __DAL_I2CAUX_INTERFACE_H__
27 #define __DAL_I2CAUX_INTERFACE_H__
28
29 #include "dc_types.h"
30 #include "gpio_service_interface.h"
31
32
33 #define DEFAULT_AUX_MAX_DATA_SIZE 16
34 #define AUX_MAX_DEFER_WRITE_RETRY 20
35
36 struct aux_payload {
37 /* set following flag to read/write I2C data,
38 * reset it to read/write DPCD data */
39 bool i2c_over_aux;
40 /* set following flag to write data,
41 * reset it to read data */
42 bool write;
43 bool mot;
44 uint32_t address;
45 uint8_t length;
46 uint8_t *data;
47 /*
48 * used to return the reply type of the transaction
49 * ignored if NULL
50 */
51 uint8_t *reply;
52 /* expressed in milliseconds
53 * zero means "use default value"
54 */
55 uint32_t defer_delay;
56 };
57
58 struct aux_command {
59 struct aux_payload *payloads;
60 uint8_t number_of_payloads;
61
62 /* expressed in milliseconds
63 * zero means "use default value" */
64 uint32_t defer_delay;
65
66 /* zero means "use default value" */
67 uint32_t max_defer_write_retry;
68
69 enum i2c_mot_mode mot;
70 };
71
72 union aux_config {
73 struct {
74 uint32_t ALLOW_AUX_WHEN_HPD_LOW:1;
75 } bits;
76 uint32_t raw;
77 };
78
79 #endif