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/*
* Copyright (c) 2011 Texas Instruments, Inc.
* Copyright (c) 2011 Trusted Logic S.A.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* This file implements the non-secure rproc and smc interface/integration
*/
#include <linux/types.h>
#include <linux/module.h>
#include "tee_client_api.h"
#include "tf_defs.h"
/*C2537CC3-36F0-48D9-820E-559601478029*/
#define COMMON_SECURE_DRIVER_UUID {0xC2537CC3, 0x36F0, 0x48D9, \
{0x82, 0x0E, 0x55, 0x96, 0x01, 0x47, 0x80, 0x29} }
#define ENTER_SECURE_PLAYBACK 0x00003000
#define EXIT_SECURE_PLAYBACK 0x00003001
enum rproc_drm_s_state {
RPROC_DRM_SECURE_LEAVE,
RPROC_DRM_SECURE_ENTER
};
static enum rproc_drm_s_state s_state;
static TEEC_Result rproc_drm_initialize(TEEC_Context *teec_context,
TEEC_Session *teec_session)
{
static const TEEC_UUID drm_uuid = COMMON_SECURE_DRIVER_UUID;
static u32 drm_gid = 1019;
TEEC_Result result;
result = TEEC_InitializeContext(NULL, teec_context);
if (result != TEEC_SUCCESS)
goto exit;
result = TEEC_OpenSession(teec_context, teec_session, &drm_uuid,
TEEC_LOGIN_PRIVILEGED, &drm_gid, NULL, NULL);
if (result != TEEC_SUCCESS)
TEEC_FinalizeContext(teec_context);
exit:
return result;
}
static TEEC_Result rproc_drm_finalize(TEEC_Context *teec_context,
TEEC_Session *teec_session)
{
TEEC_CloseSession(teec_session);
TEEC_FinalizeContext(teec_context);
return TEEC_SUCCESS;
}
static TEEC_Result _rproc_drm_invoke_secure_service(bool enable)
{
TEEC_Result result;
TEEC_Operation operation;
TEEC_Context teec_context;
TEEC_Session teec_session;
u32 command;
result = rproc_drm_initialize(&teec_context, &teec_session);
if (result != TEEC_SUCCESS)
goto out;
operation.paramTypes = TEEC_PARAM_TYPES(TEEC_NONE, TEEC_NONE,
TEEC_NONE, TEEC_NONE);
command = (enable ? ENTER_SECURE_PLAYBACK :
EXIT_SECURE_PLAYBACK);
result = TEEC_InvokeCommand(&teec_session, command, &operation, NULL);
rproc_drm_finalize(&teec_context, &teec_session);
out:
return result;
}
int rproc_drm_invoke_service(bool enable)
{
int ret;
if ((s_state == RPROC_DRM_SECURE_ENTER && enable) ||
(s_state == RPROC_DRM_SECURE_LEAVE && !enable))
return 0;
ret = _rproc_drm_invoke_secure_service(enable);
s_state = (enum rproc_drm_s_state) enable;
return ret == TEEC_SUCCESS ? 0 : -EACCES;
}
EXPORT_SYMBOL(rproc_drm_invoke_service);
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