root/drivers/gpu/drm/amd/display/dc/inc/hw/aux_engine.h

INCLUDED FROM

   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_AUX_ENGINE_H__
  27 #define __DAL_AUX_ENGINE_H__
  28 
  29 #include "dc_ddc_types.h"
  30 #include "include/i2caux_interface.h"
  31 
  32 enum i2caux_transaction_operation {
  33         I2CAUX_TRANSACTION_READ,
  34         I2CAUX_TRANSACTION_WRITE
  35 };
  36 
  37 enum i2caux_transaction_address_space {
  38         I2CAUX_TRANSACTION_ADDRESS_SPACE_I2C = 1,
  39         I2CAUX_TRANSACTION_ADDRESS_SPACE_DPCD
  40 };
  41 
  42 struct i2caux_transaction_payload {
  43         enum i2caux_transaction_address_space address_space;
  44         uint32_t address;
  45         uint32_t length;
  46         uint8_t *data;
  47 };
  48 
  49 enum i2caux_transaction_status {
  50         I2CAUX_TRANSACTION_STATUS_UNKNOWN = (-1L),
  51         I2CAUX_TRANSACTION_STATUS_SUCCEEDED,
  52         I2CAUX_TRANSACTION_STATUS_FAILED_CHANNEL_BUSY,
  53         I2CAUX_TRANSACTION_STATUS_FAILED_TIMEOUT,
  54         I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR,
  55         I2CAUX_TRANSACTION_STATUS_FAILED_NACK,
  56         I2CAUX_TRANSACTION_STATUS_FAILED_INCOMPLETE,
  57         I2CAUX_TRANSACTION_STATUS_FAILED_OPERATION,
  58         I2CAUX_TRANSACTION_STATUS_FAILED_INVALID_OPERATION,
  59         I2CAUX_TRANSACTION_STATUS_FAILED_BUFFER_OVERFLOW,
  60         I2CAUX_TRANSACTION_STATUS_FAILED_HPD_DISCON
  61 };
  62 
  63 struct i2caux_transaction_request {
  64         enum i2caux_transaction_operation operation;
  65         struct i2caux_transaction_payload payload;
  66         enum i2caux_transaction_status status;
  67 };
  68 
  69 enum i2caux_engine_type {
  70         I2CAUX_ENGINE_TYPE_UNKNOWN = (-1L),
  71         I2CAUX_ENGINE_TYPE_AUX,
  72         I2CAUX_ENGINE_TYPE_I2C_DDC_HW,
  73         I2CAUX_ENGINE_TYPE_I2C_GENERIC_HW,
  74         I2CAUX_ENGINE_TYPE_I2C_SW
  75 };
  76 
  77 enum i2c_default_speed {
  78         I2CAUX_DEFAULT_I2C_HW_SPEED = 50,
  79         I2CAUX_DEFAULT_I2C_SW_SPEED = 50
  80 };
  81 
  82 union aux_config;
  83 
  84 struct aux_engine {
  85         uint32_t inst;
  86         struct ddc *ddc;
  87         struct dc_context *ctx;
  88         const struct aux_engine_funcs *funcs;
  89         /* following values are expressed in milliseconds */
  90         uint32_t delay;
  91         uint32_t max_defer_write_retry;
  92         bool acquire_reset;
  93 };
  94 
  95 struct read_command_context {
  96         uint8_t *buffer;
  97         uint32_t current_read_length;
  98         uint32_t offset;
  99         enum i2caux_transaction_status status;
 100 
 101         struct aux_request_transaction_data request;
 102         struct aux_reply_transaction_data reply;
 103 
 104         uint8_t returned_byte;
 105 
 106         uint32_t timed_out_retry_aux;
 107         uint32_t invalid_reply_retry_aux;
 108         uint32_t defer_retry_aux;
 109         uint32_t defer_retry_i2c;
 110         uint32_t invalid_reply_retry_aux_on_ack;
 111 
 112         bool transaction_complete;
 113         bool operation_succeeded;
 114 };
 115 
 116 struct write_command_context {
 117         bool mot;
 118 
 119         uint8_t *buffer;
 120         uint32_t current_write_length;
 121         enum i2caux_transaction_status status;
 122 
 123         struct aux_request_transaction_data request;
 124         struct aux_reply_transaction_data reply;
 125 
 126         uint8_t returned_byte;
 127 
 128         uint32_t timed_out_retry_aux;
 129         uint32_t invalid_reply_retry_aux;
 130         uint32_t defer_retry_aux;
 131         uint32_t defer_retry_i2c;
 132         uint32_t max_defer_retry;
 133         uint32_t ack_m_retry;
 134 
 135         uint8_t reply_data[DEFAULT_AUX_MAX_DATA_SIZE];
 136 
 137         bool transaction_complete;
 138         bool operation_succeeded;
 139 };
 140 
 141 
 142 struct aux_engine_funcs {
 143         void (*destroy)(
 144                 struct aux_engine **ptr);
 145         bool (*acquire_engine)(
 146                 struct aux_engine *engine);
 147         void (*configure)(
 148                 struct aux_engine *engine,
 149                 union aux_config cfg);
 150         void (*submit_channel_request)(
 151                 struct aux_engine *engine,
 152                 struct aux_request_transaction_data *request);
 153         void (*process_channel_reply)(
 154                 struct aux_engine *engine,
 155                 struct aux_reply_transaction_data *reply);
 156         int (*read_channel_reply)(
 157                 struct aux_engine *engine,
 158                 uint32_t size,
 159                 uint8_t *buffer,
 160                 uint8_t *reply_result,
 161                 uint32_t *sw_status);
 162         enum aux_channel_operation_result (*get_channel_status)(
 163                 struct aux_engine *engine,
 164                 uint8_t *returned_bytes);
 165         bool (*is_engine_available)(struct aux_engine *engine);
 166         enum i2caux_engine_type (*get_engine_type)(
 167                 const struct aux_engine *engine);
 168         bool (*acquire)(
 169                 struct aux_engine *engine,
 170                 struct ddc *ddc);
 171         bool (*submit_request)(
 172                 struct aux_engine *engine,
 173                 struct i2caux_transaction_request *request,
 174                 bool middle_of_transaction);
 175         void (*release_engine)(
 176                 struct aux_engine *engine);
 177         void (*destroy_engine)(
 178                 struct aux_engine **engine);
 179 };
 180 #endif