/*
    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/>.
*/
/*
   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
   aka barthess.
 */

/**
 * @file    STM32/I2Cv1/i2c_lld.h
 * @brief   STM32 I2C subsystem low level driver header.
 *
 * @addtogroup I2C
 * @{
 */

#ifndef _I2C_LLD_H_
#define _I2C_LLD_H_

#if HAL_USE_I2C || defined(__DOXYGEN__)

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

/**
 * @brief   Peripheral clock frequency.
 */
#define I2C_CLK_FREQ  ((STM32_PCLK1) / 1000000)

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

/**
 * @name    Configuration options
 * @{
 */
/**
 * @brief   I2C1 driver enable switch.
 * @details If set to @p TRUE the support for I2C1 is included.
 * @note    The default is @p FALSE.
 */
#if !defined(STM32_I2C_USE_I2C1) || defined(__DOXYGEN__)
#define STM32_I2C_USE_I2C1              FALSE
#endif

/**
 * @brief   I2C2 driver enable switch.
 * @details If set to @p TRUE the support for I2C2 is included.
 * @note    The default is @p FALSE.
 */
#if !defined(STM32_I2C_USE_I2C2) || defined(__DOXYGEN__)
#define STM32_I2C_USE_I2C2              FALSE
#endif

/**
 * @brief   I2C3 driver enable switch.
 * @details If set to @p TRUE the support for I2C3 is included.
 * @note    The default is @p FALSE.
 */
#if !defined(STM32_I2C_USE_I2C3) || defined(__DOXYGEN__)
#define STM32_I2C_USE_I2C3              FALSE
#endif

/**
 * @brief   I2C1 interrupt priority level setting.
 */
#if !defined(STM32_I2C_I2C1_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2C_I2C1_IRQ_PRIORITY     10
#endif

/**
 * @brief   I2C2 interrupt priority level setting.
 */
#if !defined(STM32_I2C_I2C2_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2C_I2C2_IRQ_PRIORITY     10
#endif

/**
 * @brief   I2C3 interrupt priority level setting.
 */
#if !defined(STM32_I2C_I2C3_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2C_I2C3_IRQ_PRIORITY     10
#endif

/**
* @brief   I2C1 DMA priority (0..3|lowest..highest).
* @note    The priority level is used for both the TX and RX DMA streams but
*          because of the streams ordering the RX stream has always priority
*          over the TX stream.
*/
#if !defined(STM32_I2C_I2C1_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2C_I2C1_DMA_PRIORITY         1
#endif

/**
* @brief   I2C2 DMA priority (0..3|lowest..highest).
* @note    The priority level is used for both the TX and RX DMA streams but
*          because of the streams ordering the RX stream has always priority
*          over the TX stream.
*/
#if !defined(STM32_I2C_I2C2_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2C_I2C2_DMA_PRIORITY         1
#endif

/**
* @brief   I2C3 DMA priority (0..3|lowest..highest).
* @note    The priority level is used for both the TX and RX DMA streams but
*          because of the streams ordering the RX stream has always priority
*          over the TX stream.
*/
#if !defined(STM32_I2C_I2C3_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_I2C_I2C3_DMA_PRIORITY         1
#endif

/**
 * @brief   I2C DMA error hook.
 * @note    The default action for DMA errors is a system halt because DMA
 *          error can only happen because programming errors.
 */
#if !defined(STM32_I2C_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_I2C_DMA_ERROR_HOOK(i2cp)  chSysHalt()
#endif

#if STM32_ADVANCED_DMA || defined(__DOXYGEN__)

/**
 * @brief   DMA stream used for I2C1 RX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2C_I2C1_RX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2C_I2C1_RX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 0)
#endif

/**
 * @brief   DMA stream used for I2C1 TX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2C_I2C1_TX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2C_I2C1_TX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 6)
#endif

/**
 * @brief   DMA stream used for I2C2 RX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2C_I2C2_RX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2C_I2C2_RX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 2)
#endif

/**
 * @brief   DMA stream used for I2C2 TX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2C_I2C2_TX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2C_I2C2_TX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 7)
#endif

/**
 * @brief   DMA stream used for I2C3 RX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2C_I2C3_RX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2C_I2C3_RX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 2)
#endif

/**
 * @brief   DMA stream used for I2C3 TX operations.
 * @note    This option is only available on platforms with enhanced DMA.
 */
#if !defined(STM32_I2C_I2C3_TX_DMA_STREAM) || defined(__DOXYGEN__)
#define STM32_I2C_I2C3_TX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 4)
#endif

#else /* !STM32_ADVANCED_DMA */

/* Fixed streams for platforms using the old DMA peripheral, the values are
   valid for both STM32F1xx and STM32L1xx.*/
#define STM32_I2C_I2C1_RX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 7)
#define STM32_I2C_I2C1_TX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 6)
#define STM32_I2C_I2C2_RX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 5)
#define STM32_I2C_I2C2_TX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 4)

#endif /* !STM32_ADVANCED_DMA*/

/* Flag for the whole STM32F1XX family. */
#if defined(STM32F10X_LD_VL) || defined(STM32F10X_MD_VL) || \
    defined(STM32F10X_LD)    || defined(STM32F10X_MD)    || \
    defined(STM32F10X_HD)    || defined(STM32F10X_XL)    || \
                                defined(STM32F10X_CL)
#define STM32F1XX_I2C
#endif
/** @} */

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

/** @brief  error checks */
#if STM32_I2C_USE_I2C1 && !STM32_HAS_I2C1
#error "I2C1 not present in the selected device"
#endif

#if STM32_I2C_USE_I2C2 && !STM32_HAS_I2C2
#error "I2C2 not present in the selected device"
#endif

#if STM32_I2C_USE_I2C3 && !STM32_HAS_I2C3
#error "I2C3 not present in the selected device"
#endif

#if !STM32_I2C_USE_I2C1 && !STM32_I2C_USE_I2C2 &&                           \
    !STM32_I2C_USE_I2C3
#error "I2C driver activated but no I2C peripheral assigned"
#endif

#if STM32_I2C_USE_I2C1 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2C_I2C1_RX_DMA_STREAM,                    \
                           STM32_I2C1_RX_DMA_MSK)
#error "invalid DMA stream associated to I2C1 RX"
#endif

#if STM32_I2C_USE_I2C1 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2C_I2C1_TX_DMA_STREAM,                    \
                           STM32_I2C1_TX_DMA_MSK)
#error "invalid DMA stream associated to I2C1 TX"
#endif

#if STM32_I2C_USE_I2C2 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2C_I2C2_RX_DMA_STREAM,                    \
                           STM32_I2C2_RX_DMA_MSK)
#error "invalid DMA stream associated to I2C2 RX"
#endif

#if STM32_I2C_USE_I2C2 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2C_I2C2_TX_DMA_STREAM,                    \
                           STM32_I2C2_TX_DMA_MSK)
#error "invalid DMA stream associated to I2C2 TX"
#endif

#if STM32_I2C_USE_I2C3 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2C_I2C3_RX_DMA_STREAM,                    \
                           STM32_I2C3_RX_DMA_MSK)
#error "invalid DMA stream associated to I2C3 RX"
#endif

#if STM32_I2C_USE_I2C3 &&                                                   \
    !STM32_DMA_IS_VALID_ID(STM32_I2C_I2C3_TX_DMA_STREAM,                    \
                           STM32_I2C3_TX_DMA_MSK)
#error "invalid DMA stream associated to I2C3 TX"
#endif

#if !defined(STM32_DMA_REQUIRED)
#define STM32_DMA_REQUIRED
#endif

/* Check clock range. */
#if defined(STM32F4XX)
#if !(I2C_CLK_FREQ >= 2) && (I2C_CLK_FREQ <= 42)
#error "I2C peripheral clock frequency out of range."
#endif

#elif defined(STM32L1XX_MD)
#if !(I2C_CLK_FREQ >= 2) && (I2C_CLK_FREQ <= 32)
#error "I2C peripheral clock frequency out of range."
#endif

#elif defined(STM32F2XX)
#if !(I2C_CLK_FREQ >= 2) && (I2C_CLK_FREQ <= 30)
#error "I2C peripheral clock frequency out of range."
#endif

#elif defined(STM32F10X_LD_VL) || defined(STM32F10X_MD_VL) ||               \
      defined(STM32F10X_HD_VL)
#if !(I2C_CLK_FREQ >= 2) && (I2C_CLK_FREQ <= 24)
#error "I2C peripheral clock frequency out of range."
#endif

#elif defined(STM32F10X_LD) || defined(STM32F10X_MD) ||                     \
      defined(STM32F10X_HD) || defined(STM32F10X_XL) ||                     \
      defined(STM32F10X_CL)
#if !(I2C_CLK_FREQ >= 2) && (I2C_CLK_FREQ <= 36)
#error "I2C peripheral clock frequency out of range."
#endif
#else
#error "unspecified, unsupported or invalid STM32 platform"
#endif

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

/**
 * @brief   Type representing I2C address.
 */
typedef uint16_t i2caddr_t;

/**
 * @brief   I2C Driver condition flags type.
 */
typedef uint32_t i2cflags_t;

/**
 * @brief   Supported modes for the I2C bus.
 */
typedef enum {
  OPMODE_I2C = 1,
  OPMODE_SMBUS_DEVICE = 2,
  OPMODE_SMBUS_HOST = 3,
} i2copmode_t;

/**
 * @brief   Supported duty cycle modes for the I2C bus.
 */
typedef enum {
  STD_DUTY_CYCLE = 1,
  FAST_DUTY_CYCLE_2 = 2,
  FAST_DUTY_CYCLE_16_9 = 3,
} i2cdutycycle_t;

/**
 * @brief Driver configuration structure.
 */
typedef struct {
  i2copmode_t     op_mode;       /**< @brief Specifies the I2C mode.        */
  uint32_t        clock_speed;   /**< @brief Specifies the clock frequency.
                                      @note Must be set to a value lower
                                      than 400kHz.                          */
  i2cdutycycle_t  duty_cycle;    /**< @brief Specifies the I2C fast mode
                                      duty cycle.                           */
} I2CConfig;

/**
 * @brief   Type of a structure representing an I2C driver.
 */
typedef struct I2CDriver I2CDriver;

/**
 * @brief Structure representing an I2C driver.
 */
struct I2CDriver {
  /**
   * @brief   Driver state.
   */
  i2cstate_t                state;
  /**
   * @brief   Current configuration data.
   */
  const I2CConfig           *config;
  /**
   * @brief   Error flags.
   */
  i2cflags_t                errors;
#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
  /**
   * @brief   Mutex protecting the bus.
   */
  Mutex                     mutex;
#elif CH_USE_SEMAPHORES
  Semaphore                 semaphore;
#endif
#endif /* I2C_USE_MUTUAL_EXCLUSION */
#if defined(I2C_DRIVER_EXT_FIELDS)
  I2C_DRIVER_EXT_FIELDS
#endif
  /* End of the mandatory fields.*/
  /**
   * @brief   Thread waiting for I/O completion.
   */
  Thread                    *thread;
  /**
   * @brief     Current slave address without R/W bit.
   */
  i2caddr_t                 addr;
  /**
   * @brief RX DMA mode bit mask.
   */
  uint32_t                  rxdmamode;
  /**
   * @brief TX DMA mode bit mask.
   */
  uint32_t                  txdmamode;
  /**
   * @brief     Receive DMA channel.
   */
  const stm32_dma_stream_t  *dmarx;
  /**
   * @brief     Transmit DMA channel.
   */
  const stm32_dma_stream_t  *dmatx;
  /**
   * @brief     Pointer to the I2Cx registers block.
   */
  I2C_TypeDef               *i2c;
};

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

/**
 * @brief   Get errors from I2C driver.
 *
 * @param[in] i2cp      pointer to the @p I2CDriver object
 *
 * @notapi
 */
#define i2c_lld_get_errors(i2cp) ((i2cp)->errors)

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

#if !defined(__DOXYGEN__)
#if STM32_I2C_USE_I2C1
extern I2CDriver I2CD1;
#endif

#if STM32_I2C_USE_I2C2
extern I2CDriver I2CD2;
#endif

#if STM32_I2C_USE_I2C3
extern I2CDriver I2CD3;
#endif
#endif /* !defined(__DOXYGEN__) */

#ifdef __cplusplus
extern "C" {
#endif
  void i2c_lld_init(void);
  void i2c_lld_start(I2CDriver *i2cp);
  void i2c_lld_stop(I2CDriver *i2cp);
  msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
                                        const uint8_t *txbuf, size_t txbytes,
                                        uint8_t *rxbuf, size_t rxbytes,
                                        systime_t timeout);
  msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
                                       uint8_t *rxbuf, size_t rxbytes,
                                       systime_t timeout);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_I2C  */

#endif /* _I2C_LLD_H_ */

/** @} */