/*
    Copyright (C) 2020 Yaotian Feng

    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_pal_lld.h
 * @brief   PLATFORM PAL subsystem low level driver header.
 *
 * @addtogroup PAL
 * @{
 */

#ifndef HAL_PAL_LLD_H
#define HAL_PAL_LLD_H

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

/*===========================================================================*/
/* Unsupported modes and specific modes                                      */
/*===========================================================================*/

#undef PAL_MODE_RESET
#undef PAL_MODE_UNCONNECTED
#undef PAL_MODE_INPUT
#undef PAL_MODE_INPUT_PULLUP
#undef PAL_MODE_INPUT_PULLDOWN
#undef PAL_MODE_INPUT_ANALOG
#undef PAL_MODE_OUTPUT_PUSHPULL
#undef PAL_MODE_OUTPUT_OPENDRAIN

#define PAL_HT32_MODE_DIR           ( 1U <<  0)
#define PAL_HT32_MODE_INE           ( 1U <<  1)
#define PAL_HT32_MODE_PU            ( 1U <<  2)
#define PAL_HT32_MODE_PD            ( 1U <<  3)
#define PAL_HT32_MODE_OD            ( 1U <<  4)
#define PAL_HT32_MODE_DRV           ( 1U <<  5)
#define PAL_HT32_MODE_LOCK          ( 1U <<  6)
#define PAL_HT32_MODE_AF_MASK       (15U <<  8)
#define PAL_HT32_MODE_AFE           ( 1U << 15)
#define PAL_HT32_MODE_AF(m)         (PAL_HT32_MODE_AFE | ((m) <<  8))

//#define PAL_MODE_RESET              (0)
#define PAL_MODE_UNCONNECTED        (PAL_HT32_MODE_LOCK)
#define PAL_MODE_INPUT              (PAL_HT32_MODE_INE)
#define PAL_MODE_INPUT_PULLUP       (PAL_HT32_MODE_PU|PAL_HT32_MODE_INE)
#define PAL_MODE_INPUT_PULLDOWN     (PAL_HT32_MODE_PD|PAL_HT32_MODE_INE)
#define PAL_MODE_INPUT_ANALOG       (PAL_HT32_MODE_AF(2))
#define PAL_MODE_OUTPUT_PUSHPULL    (PAL_HT32_MODE_DIR)
#define PAL_MODE_OUTPUT_OPENDRAIN   (PAL_HT32_MODE_OD|PAL_HT32_MODE_DIR)
#define PAL_MODE_HT32_AF            PAL_HT32_MODE_AF

/*===========================================================================*/
/* I/O Ports Types and constants.                                            */
/*===========================================================================*/

/**
 * @name    Port related definitions
 * @{
 */
/**
 * @brief   Width, in bits, of an I/O port.
 */
#define PAL_IOPORTS_WIDTH           16U

/**
 * @brief   Whole port mask.
 * @details This macro specifies all the valid bits into a port.
 */
#define PAL_WHOLE_PORT              ((ioportmask_t)0xFFFFU)
/** @} */

/**
 * @name    Line handling macros
 * @{
 */
/**
 * @brief   Forms a line identifier.
 * @details A port/pad pair are encoded into an @p ioline_t type. The encoding
 *          of this type is platform-dependent.
 */
#define PAL_LINE(port, pad)                                                 \
  ((ioline_t)((uint32_t)(port)) | ((uint32_t)(pad)))

/**
 * @brief   Decodes a port identifier from a line identifier.
 */
#define PAL_PORT(line)                                                      \
  ((GPIO_TypeDef *)(((uint32_t)(line)) & 0xFFFFFFC0U))

/**
 * @brief   Decodes a pad identifier from a line identifier.
 */
#define PAL_PAD(line)                                                       \
  ((uint32_t)((uint32_t)(line) & 0x0000000FU))

/**
 * @brief   Value identifying an invalid line.
 */
#define PAL_NOLINE                      0U
/** @} */

/**
 * @brief   Generic I/O ports static initializer.
 * @details An instance of this structure must be passed to @p palInit() at
 *          system startup time in order to initialized the digital I/O
 *          subsystem. This represents only the initial setup, specific pads
 *          or whole ports can be reprogrammed at later time.
 * @note    Implementations may extend this structure to contain more,
 *          architecture dependent, fields.
 */
struct port_setup {
  uint16_t DIR;
  uint16_t INE;
  uint16_t PU;
  uint16_t PD;
  uint16_t OD;
  uint16_t DRV;
  uint16_t LOCK;
  uint16_t OUT;
  uint32_t CFG[2];
};

typedef struct {
  struct port_setup setup[HT32_NUM_GPIO];
  uint32_t ESSR[2];
} PALConfig;

/**
 * @brief   Digital I/O port sized unsigned type.
 */
typedef uint16_t ioportmask_t;

/**
 * @brief   Digital I/O modes.
 */
typedef uint16_t iomode_t;

/**
 * @brief   Type of an I/O line.
 */
typedef uintptr_t ioline_t;

/**
 * @brief   Port Identifier.
 * @details This type can be a scalar or some kind of pointer, do not make
 *          any assumption about it, use the provided macros when populating
 *          variables of this type.
 */
typedef GPIO_TypeDef * ioportid_t;

/**
 * @brief Type of an pad identifier
 */
typedef uint32_t iopadid_t;

/*===========================================================================*/
/* I/O Ports Identifiers.                                                    */
/*===========================================================================*/

/**
 * @brief   First I/O port identifier.
 * @details Low level drivers can define multiple ports, it is suggested to
 *          use this naming convention.
 */
#define HT32_PAL_ID(x)  ((ioportid_t)(GPIO_A_BASE + (x << HT32_GPIO_INDEX_BITS)))
#define HT32_PAL_IDX(x) (((uintptr_t)(x) - GPIO_A_BASE) >> HT32_GPIO_INDEX_BITS)
#define IOPORT1         HT32_PAL_ID(0)
#define IOPORT2         HT32_PAL_ID(1)
#define IOPORT3         HT32_PAL_ID(2)
#define IOPORT4         HT32_PAL_ID(3)
#define IOPORT5         HT32_PAL_ID(4)
#define IOPORTA IOPORT1
#define IOPORTB IOPORT2
#define IOPORTC IOPORT3
#define IOPORTD IOPORT4
#define IOPORTE IOPORT5

/*===========================================================================*/
/* Implementation, some of the following macros could be implemented as      */
/* functions, if so please put them in pal_lld.c.                            */
/*===========================================================================*/

/**
 * @brief   Low level PAL subsystem initialization.
 *
 * @param[in] config    architecture-dependent ports configuration
 *
 * @notapi
 */
#define pal_lld_init(config) _pal_lld_init(config)

/**
 * @brief   Reads the physical I/O port states.
 *
 * @param[in] port      port identifier
 * @return              The port bits.
 *
 * @notapi
 */
#define pal_lld_readport(port) (PAL_PORT(port)->DINR)

/**
 * @brief   Reads the output latch.
 * @details The purpose of this function is to read back the latched output
 *          value.
 *
 * @param[in] port      port identifier
 * @return              The latched logical states.
 *
 * @notapi
 */
#define pal_lld_readlatch(port) (PAL_PORT(port)->DOUTR)

/**
 * @brief   Writes a bits mask on a I/O port.
 *
 * @param[in] port      port identifier
 * @param[in] bits      bits to be written on the specified port
 *
 * @notapi
 */
#define pal_lld_writeport(port, bits)                                       \
  do {                                                                      \
    PAL_PORT(port)->DOUTR = (bits);                                         \
  } while (false)


/**
 * @brief   Sets a bits mask on a I/O port.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] bits      bits to be ORed on the specified port
 *
 * @notapi
 */
#define pal_lld_setport(port, bits)                                         \
  do {                                                                      \
    PAL_PORT(port)->SRR = (bits);                                           \
  } while (false)


/**
 * @brief   Clears a bits mask on a I/O port.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] bits      bits to be cleared on the specified port
 *
 * @notapi
 */
#define pal_lld_clearport(port, bits)                                       \
  do {                                                                      \
    PAL_PORT(port)->RR = (bits);                                            \
  } while (false)


#if 0
/**
 * @brief   Toggles a bits mask on a I/O port.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] bits      bits to be XORed on the specified port
 *
 * @notapi
 */
#define pal_lld_toggleport(port, bits)                                      \
  do {                                                                      \
    (void)port;                                                             \
    (void)bits;                                                             \
  } while (false)


/**
 * @brief   Reads a group of bits.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] mask      group mask
 * @param[in] offset    group bit offset within the port
 * @return              The group logical states.
 *
 * @notapi
 */
#define pal_lld_readgroup(port, mask, offset) 0U

/**
 * @brief   Writes a group of bits.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] mask      group mask
 * @param[in] offset    group bit offset within the port
 * @param[in] bits      bits to be written. Values exceeding the group width
 *                      are masked.
 *
 * @notapi
 */
#define pal_lld_writegroup(port, mask, offset, bits)                        \
  do {                                                                      \
    (void)port;                                                             \
    (void)mask;                                                             \
    (void)offset;                                                           \
    (void)bits;                                                             \
  } while (false)
#endif

/**
 * @brief   Pads group mode setup.
 * @details This function programs a pads group belonging to the same port
 *          with the specified mode.
 * @note    Programming an unknown or unsupported mode is silently ignored.
 *
 * @param[in] port      port identifier
 * @param[in] mask      group mask
 * @param[in] offset    group bit offset within the port
 * @param[in] mode      group mode
 *
 * @notapi
 */
#define pal_lld_setgroupmode(port, mask, offset, mode)                      \
  _pal_lld_setgroupmode(port, mask << offset, mode)

#if 0
/**
 * @brief   Reads a logical state from an I/O pad.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 * @return              The logical state.
 * @retval PAL_LOW      low logical state.
 * @retval PAL_HIGH     high logical state.
 *
 * @notapi
 */
#define pal_lld_readpad(port, pad) PAL_LOW

/**
 * @brief   Writes a logical state on an output pad.
 * @note    This function is not meant to be invoked directly by the
 *          application  code.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 * @param[in] bit       logical value, the value must be @p PAL_LOW or
 *                      @p PAL_HIGH
 *
 * @notapi
 */
#define pal_lld_writepad(port, pad, bit)                                    \
  do {                                                                      \
    (void)port;                                                             \
    (void)pad;                                                              \
    (void)bit;                                                              \
  } while (false)

/**
 * @brief   Sets a pad logical state to @p PAL_HIGH.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 *
 * @notapi
 */
#define pal_lld_setpad(port, pad)                                           \
  do {                                                                      \
    (void)port;                                                             \
    (void)pad;                                                              \
  } while (false)


/**
 * @brief   Clears a pad logical state to @p PAL_LOW.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 *
 * @notapi
 */
#define pal_lld_clearpad(port, pad)                                         \
  do {                                                                      \
    (void)port;                                                             \
    (void)pad;                                                              \
  } while (false)


/**
 * @brief   Toggles a pad logical state.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 *
 * @notapi
 */
#define pal_lld_togglepad(port, pad)                                        \
  do {                                                                      \
    (void)port;                                                             \
    (void)pad;                                                              \
  } while (false)


/**
 * @brief   Pad mode setup.
 * @details This function programs a pad with the specified mode.
 * @note    The @ref PAL provides a default software implementation of this
 *          functionality, implement this function if can optimize it by using
 *          special hardware functionalities or special coding.
 * @note    Programming an unknown or unsupported mode is silently ignored.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 * @param[in] mode      pad mode
 *
 * @notapi
 */
#define pal_lld_setpadmode(port, pad, mode)                                 \
  do {                                                                      \
    (void)port;                                                             \
    (void)pad;                                                              \
    (void)mode;                                                             \
  } while (false)

#endif

#if !defined(__DOXYGEN__)
extern const PALConfig pal_default_config;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void _pal_lld_init(const PALConfig *config);
  void _pal_lld_setgroupmode(ioportid_t port,
                             ioportmask_t mask,
                             iomode_t mode);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_PAL == TRUE */

#endif /* HAL_PAL_LLD_H */

/** @} */