/*
    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

/**
 * @file    hal_trng_lld.h
 * @brief   PLATFORM TRNG subsystem low level driver header.
 *
 * @addtogroup TRNG
 * @{
 */

#ifndef HAL_TRNG_LLD_H
#define HAL_TRNG_LLD_H

#if (HAL_USE_TRNG == TRUE) || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver constants.                                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Driver pre-compile time settings.                                         */
/*===========================================================================*/

/**
 * @name    PLATFORM configuration options
 * @{
 */
/**
 * @brief   TRNGD1 driver enable switch.
 * @details If set to @p TRUE the support for TRNGD1 is included.
 * @note    The default is @p FALSE.
 */
#if !defined(PLATFORM_TRNG_USE_TRNG1) || defined(__DOXYGEN__)
#define PLATFORM_TRNG_USE_TRNG1               FALSE
#endif
/** @} */

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

/*===========================================================================*/
/* Driver data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   Driver configuration structure.
 * @note    It could be empty on some architectures.
 */
typedef struct {
  /* End of the mandatory fields.*/
  /**
   * @brief   Dummy configuration, it is not needed..
   */
  uint32_t                   dummy;
} TRNGConfig;

/**
 * @brief   Structure representing a TRNG driver.
 */
struct TRNGDriver {
  /**
   * @brief Driver state.
   */
  trngstate_t                state;
  /**
   * @brief Current configuration data.
   */
  const TRNGConfig           *config;
#if defined(TRNG_DRIVER_EXT_FIELDS)
  TRNG_DRIVER_EXT_FIELDS
#endif
  /* End of the mandatory fields.*/
};

/*===========================================================================*/
/* Driver macros.                                                            */
/*===========================================================================*/

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#if (PLATFORM_TRNG_USE_TRNG1 == TRUE) && !defined(__DOXYGEN__)
extern TRNGDriver TRNGD1;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void trng_lld_init(void);
  void trng_lld_start(TRNGDriver *trngp);
  void trng_lld_stop(TRNGDriver *trngp);
  bool trng_lld_generate(TRNGDriver *trngp, size_t size, uint8_t *out);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_TRNG == TRUE */

#endif /* HAL_TRNG_LLD_H */

/** @} */