cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

dce_i2c.c (2386B)

      1/*
      2 * Copyright 2018 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#include "dce_i2c.h"
     26#include "reg_helper.h"
     27
     28bool dce_i2c_oem_device_present(
     29	struct resource_pool *pool,
     30	struct ddc_service *ddc,
     31	size_t slave_address
     32)
     33{
     34	struct dc *dc = ddc->ctx->dc;
     35	struct dc_bios *dcb = dc->ctx->dc_bios;
     36	struct graphics_object_id id = {0};
     37	struct graphics_object_i2c_info i2c_info;
     38
     39	if (!dc->ctx->dc_bios->fw_info.oem_i2c_present)
     40		return false;
     41
     42	id.id = dc->ctx->dc_bios->fw_info.oem_i2c_obj_id;
     43	id.enum_id = 0;
     44	id.type = OBJECT_TYPE_GENERIC;
     45	if (dcb->funcs->get_i2c_info(dcb, id, &i2c_info) != BP_RESULT_OK)
     46		return false;
     47
     48	if (i2c_info.i2c_slave_address != slave_address)
     49		return false;
     50
     51	return true;
     52}
     53
     54bool dce_i2c_submit_command(
     55	struct resource_pool *pool,
     56	struct ddc *ddc,
     57	struct i2c_command *cmd)
     58{
     59	struct dce_i2c_hw *dce_i2c_hw;
     60	struct dce_i2c_sw dce_i2c_sw = {0};
     61
     62	if (!ddc) {
     63		BREAK_TO_DEBUGGER();
     64		return false;
     65	}
     66
     67	if (!cmd) {
     68		BREAK_TO_DEBUGGER();
     69		return false;
     70	}
     71
     72	dce_i2c_hw = acquire_i2c_hw_engine(pool, ddc);
     73
     74	if (dce_i2c_hw)
     75		return dce_i2c_submit_command_hw(pool, ddc, cmd, dce_i2c_hw);
     76
     77	dce_i2c_sw.ctx = ddc->ctx;
     78	if (dce_i2c_engine_acquire_sw(&dce_i2c_sw, ddc)) {
     79		return dce_i2c_submit_command_sw(pool, ddc, cmd, &dce_i2c_sw);
     80	}
     81
     82	return false;
     83}