/*
    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_pal_lld.h
 * @brief   Simulator low level PAL driver header.
 *
 * @addtogroup SIMULATOR_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_INPUT_PULLUP
#undef PAL_MODE_INPUT_PULLDOWN
#undef PAL_MODE_OUTPUT_OPENDRAIN
#undef PAL_MODE_INPUT_ANALOG

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

/**
 * @brief   VIO port structure.
 */
typedef struct {
  /**
   * @brief   VIO_LATCH register.
   * @details This register represents the output latch of the VIO port.
   */
  uint32_t          latch;
  /**
   * @brief   VIO_PIN register.
   * @details This register represents the logical level at the VIO port
   *          pin level.
   */
  uint32_t          pin;
  /**
   * @brief   VIO_DIR register.
   * @details Direction of the VIO port bits, 0=input, 1=output.
   */
  uint32_t          dir;
} sim_vio_port_t;

/**
 * @brief   Virtual 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.
 */
typedef struct {
  /**
   * @brief Virtual port 1 setup data.
   */
  sim_vio_port_t    VP1Data;
  /**
   * @brief Virtual port 2 setup data.
   */
  sim_vio_port_t    VP2Data;
} PALConfig;

/**
 * @brief   Width, in bits, of an I/O port.
 */
#define PAL_IOPORTS_WIDTH 32

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

/**
 * @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)                                                      \
  ((sim_vio_port_t *)(((uint32_t)(line)) & 0xFFFFFFF0U))

/**
 * @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   Digital I/O port sized unsigned type.
 */
typedef uint32_t ioportmask_t;

/**
 * @brief   Digital I/O modes.
 */
typedef uint32_t iomode_t;

/**
 * @brief   Type of an I/O line.
 */
typedef uint32_t ioline_t;

/**
 * @brief   Port Identifier.
 */
typedef sim_vio_port_t * ioportid_t;

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

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

/**
 * @brief   VIO port 1 identifier.
 */
#define IOPORT1         (&vio_port_1)

/**
 * @brief   VIO port 2 identifier.
 */
#define IOPORT2         (&vio_port_2)

/*===========================================================================*/
/* 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)                                                \
  (vio_port_1 = (config)->VP1Data,                                          \
   vio_port_2 = (config)->VP2Data)

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

/**
 * @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) ((port)->latch)

/**
 * @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) ((port)->latch = (bits))

/**
 * @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)

/**
 * @brief   Returns a PAL event structure associated to a pad.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 *
 * @notapi
 */
#define pal_lld_get_pad_event(port, pad) NULL; (void)(port); (void)pad

/**
 * @brief   Returns a PAL event structure associated to a line.
 *
 * @param[in] line      line identifier
 *
 * @notapi
 */
#define pal_lld_get_line_event(line) NULL; (void)line

#if !defined(__DOXYGEN__)
extern sim_vio_port_t vio_port_1;
extern sim_vio_port_t vio_port_2;
extern const PALConfig pal_default_config;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  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 */

/** @} */