/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012,2013 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT 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.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    STM32/gpt_lld.h
 * @brief   STM32 GPT subsystem low level driver header.
 *
 * @addtogroup GPT
 * @{
 */

#ifndef _GPT_LLD_H_
#define _GPT_LLD_H_

#if HAL_USE_GPT || defined(__DOXYGEN__)

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

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

/**
 * @name    Configuration options
 * @{
 */
/**
 * @brief   GPTD1 driver enable switch.
 * @details If set to @p TRUE the support for GPTD1 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_GPT_USE_TIM1) || defined(__DOXYGEN__)
#define STM32_GPT_USE_TIM1                  FALSE
#endif

/**
 * @brief   GPTD2 driver enable switch.
 * @details If set to @p TRUE the support for GPTD2 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_GPT_USE_TIM2) || defined(__DOXYGEN__)
#define STM32_GPT_USE_TIM2                  FALSE
#endif

/**
 * @brief   GPTD3 driver enable switch.
 * @details If set to @p TRUE the support for GPTD3 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_GPT_USE_TIM3) || defined(__DOXYGEN__)
#define STM32_GPT_USE_TIM3                  FALSE
#endif

/**
 * @brief   GPTD4 driver enable switch.
 * @details If set to @p TRUE the support for GPTD4 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_GPT_USE_TIM4) || defined(__DOXYGEN__)
#define STM32_GPT_USE_TIM4                  FALSE
#endif

/**
 * @brief   GPTD5 driver enable switch.
 * @details If set to @p TRUE the support for GPTD5 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_GPT_USE_TIM5) || defined(__DOXYGEN__)
#define STM32_GPT_USE_TIM5                  FALSE
#endif

/**
 * @brief   GPTD8 driver enable switch.
 * @details If set to @p TRUE the support for GPTD8 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_GPT_USE_TIM8) || defined(__DOXYGEN__)
#define STM32_GPT_USE_TIM8                  FALSE
#endif

/**
 * @brief   GPTD1 interrupt priority level setting.
 */
#if !defined(STM32_GPT_TIM1_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_GPT_TIM1_IRQ_PRIORITY         7
#endif

/**
 * @brief   GPTD2 interrupt priority level setting.
 */
#if !defined(STM32_GPT_TIM2_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_GPT_TIM2_IRQ_PRIORITY         7
#endif

/**
 * @brief   GPTD3 interrupt priority level setting.
 */
#if !defined(STM32_GPT_TIM3_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_GPT_TIM3_IRQ_PRIORITY         7
#endif

/**
 * @brief   GPTD4 interrupt priority level setting.
 */
#if !defined(STM32_GPT_TIM4_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_GPT_TIM4_IRQ_PRIORITY         7
#endif

/**
 * @brief   GPTD5 interrupt priority level setting.
 */
#if !defined(STM32_GPT_TIM5_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_GPT_TIM5_IRQ_PRIORITY         7
#endif

/**
 * @brief   GPTD5 interrupt priority level setting.
 */
#if !defined(STM32_GPT_TIM8_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_GPT_TIM8_IRQ_PRIORITY         7
#endif
/** @} */

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

#if STM32_GPT_USE_TIM1 && !STM32_HAS_TIM1
#error "TIM1 not present in the selected device"
#endif

#if STM32_GPT_USE_TIM2 && !STM32_HAS_TIM2
#error "TIM2 not present in the selected device"
#endif

#if STM32_GPT_USE_TIM3 && !STM32_HAS_TIM3
#error "TIM3 not present in the selected device"
#endif

#if STM32_GPT_USE_TIM4 && !STM32_HAS_TIM4
#error "TIM4 not present in the selected device"
#endif

#if STM32_GPT_USE_TIM5 && !STM32_HAS_TIM5
#error "TIM5 not present in the selected device"
#endif

#if STM32_GPT_USE_TIM8 && !STM32_HAS_TIM8
#error "TIM8 not present in the selected device"
#endif

#if !STM32_GPT_USE_TIM1 && !STM32_GPT_USE_TIM2 &&                           \
    !STM32_GPT_USE_TIM3 && !STM32_GPT_USE_TIM4 &&                           \
    !STM32_GPT_USE_TIM5 && !STM32_GPT_USE_TIM8
#error "GPT driver activated but no TIM peripheral assigned"
#endif

#if STM32_GPT_USE_TIM1 &&                                                   \
    !CORTEX_IS_VALID_KERNEL_PRIORITY(STM32_GPT_TIM1_IRQ_PRIORITY)
#error "Invalid IRQ priority assigned to TIM1"
#endif

#if STM32_GPT_USE_TIM2 &&                                                   \
    !CORTEX_IS_VALID_KERNEL_PRIORITY(STM32_GPT_TIM2_IRQ_PRIORITY)
#error "Invalid IRQ priority assigned to TIM2"
#endif

#if STM32_GPT_USE_TIM3 &&                                                   \
    !CORTEX_IS_VALID_KERNEL_PRIORITY(STM32_GPT_TIM3_IRQ_PRIORITY)
#error "Invalid IRQ priority assigned to TIM3"
#endif

#if STM32_GPT_USE_TIM4 &&                                                   \
    !CORTEX_IS_VALID_KERNEL_PRIORITY(STM32_GPT_TIM4_IRQ_PRIORITY)
#error "Invalid IRQ priority assigned to TIM4"
#endif

#if STM32_GPT_USE_TIM5 &&                                                   \
    !CORTEX_IS_VALID_KERNEL_PRIORITY(STM32_GPT_TIM5_IRQ_PRIORITY)
#error "Invalid IRQ priority assigned to TIM5"
#endif

#if STM32_GPT_USE_TIM8 &&                                                   \
    !CORTEX_IS_VALID_KERNEL_PRIORITY(STM32_GPT_TIM8_IRQ_PRIORITY)
#error "Invalid IRQ priority assigned to TIM8"
#endif

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

/**
 * @brief   GPT frequency type.
 */
typedef uint32_t gptfreq_t;

/**
 * @brief   GPT counter type.
 */
typedef uint16_t gptcnt_t;

/**
 * @brief   Driver configuration structure.
 * @note    It could be empty on some architectures.
 */
typedef struct {
  /**
   * @brief   Timer clock in Hz.
   * @note    The low level can use assertions in order to catch invalid
   *          frequency specifications.
   */
  gptfreq_t                 frequency;
  /**
   * @brief   Timer callback pointer.
   * @note    This callback is invoked on GPT counter events.
   */
  gptcallback_t             callback;
  /* End of the mandatory fields.*/
} GPTConfig;

/**
 * @brief   Structure representing a GPT driver.
 */
struct GPTDriver {
  /**
   * @brief Driver state.
   */
  gptstate_t                state;
  /**
   * @brief Current configuration data.
   */
  const GPTConfig           *config;
#if defined(GPT_DRIVER_EXT_FIELDS)
  GPT_DRIVER_EXT_FIELDS
#endif
  /* End of the mandatory fields.*/
  /**
   * @brief Timer base clock.
   */
  uint32_t                  clock;
  /**
   * @brief Pointer to the TIMx registers block.
   */
  stm32_tim_t               *tim;
};

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

/**
 * @brief   Changes the interval of GPT peripheral.
 * @details This function changes the interval of a running GPT unit.
 * @pre     The GPT unit must have been activated using @p gptStart().
 * @pre     The GPT unit must have been running in continuous mode using
 *          @p gptStartContinuous().
 * @post    The GPT unit interval is changed to the new value.
 * @note    The function has effect at the next cycle start.
 *
 * @param[in] gptp      pointer to a @p GPTDriver object
 * @param[in] interval  new cycle time in timer ticks
 * @notapi
 */
#define gpt_lld_change_interval(gptp, interval)                               \
  ((gptp)->tim->ARR = (uint16_t)((interval) - 1))

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

#if STM32_GPT_USE_TIM1 && !defined(__DOXYGEN__)
extern GPTDriver GPTD1;
#endif

#if STM32_GPT_USE_TIM2 && !defined(__DOXYGEN__)
extern GPTDriver GPTD2;
#endif

#if STM32_GPT_USE_TIM3 && !defined(__DOXYGEN__)
extern GPTDriver GPTD3;
#endif

#if STM32_GPT_USE_TIM4 && !defined(__DOXYGEN__)
extern GPTDriver GPTD4;
#endif

#if STM32_GPT_USE_TIM5 && !defined(__DOXYGEN__)
extern GPTDriver GPTD5;
#endif

#if STM32_GPT_USE_TIM8 && !defined(__DOXYGEN__)
extern GPTDriver GPTD8;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void gpt_lld_init(void);
  void gpt_lld_start(GPTDriver *gptp);
  void gpt_lld_stop(GPTDriver *gptp);
  void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t period);
  void gpt_lld_stop_timer(GPTDriver *gptp);
  void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_GPT */

#endif /* _GPT_LLD_H_ */

/** @} */