/*
 * Licensed under ST Liberty SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2
 *
 * 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    SPC5xx/SIUL_v1/pal_lld.h
 * @brief   SPC5xx SIUL low level driver header.
 *
 * @addtogroup PAL
 * @{
 */

#ifndef _PAL_LLD_H_
#define _PAL_LLD_H_

#if HAL_USE_PAL || 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

/**
 * @name    SIUL-specific PAL modes
 * @{
 */
#define PAL_SPC5_SMC                (1U << 14)
#define PAL_SPC5_APC                (1U << 13)
#define PAL_SPC5_PA_MASK            (3U << 10)
#define PAL_SPC5_PA(n)              ((n) << 10)
#define PAL_SPC5_OBE                (1U << 9)
#define PAL_SPC5_IBE                (1U << 8)
#define PAL_SPC5_ODE                (1U << 5)
#define PAL_SPC5_SRC                (1U << 2)
#define PAL_SPC5_WPE                (1U << 1)
#define PAL_SPC5_WPS                (1U << 0)
/** @} */

/**
 * @name    Pads mode constants
 * @{
 */
/**
 * @brief   After reset state.
 */
#define PAL_MODE_RESET                  0

/**
 * @brief   Safe state for <b>unconnected</b> pads.
 */
#define PAL_MODE_UNCONNECTED            (PAL_SPC5_WPE | PAL_SPC5_WPS)

/**
 * @brief   Regular input high-Z pad.
 */
#define PAL_MODE_INPUT                  (PAL_SPC5_IBE)

/**
 * @brief   Input pad with weak pull up resistor.
 */
#define PAL_MODE_INPUT_PULLUP           (PAL_SPC5_IBE |PAL_SPC5_WPE |       \
                                         PAL_SPC5_WPS)

/**
 * @brief   Input pad with weak pull down resistor.
 */
#define PAL_MODE_INPUT_PULLDOWN         (PAL_SPC5_IBE |PAL_SPC5_WPE)

/**
 * @brief   Analog input mode.
 */
#define PAL_MODE_INPUT_ANALOG           PAL_SPC5_APC

/**
 * @brief   Push-pull output pad.
 */
#define PAL_MODE_OUTPUT_PUSHPULL        (PAL_SPC5_IBE | PAL_SPC5_OBE)

/**
 * @brief   Open-drain output pad.
 */
#define PAL_MODE_OUTPUT_OPENDRAIN       (PAL_SPC5_IBE | PAL_SPC5_OBE |      \
                                         PAL_SPC5_ODE)

/**
 * @brief   Alternate "n" output pad.
 */
#define PAL_MODE_OUTPUT_ALTERNATE(n)    (PAL_SPC5_IBE | PAL_SPC5_PA(n))
/** @} */

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

/**
 * @brief   Width, in bits, of an I/O port.
 */
#define PAL_IOPORTS_WIDTH 16

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

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

/**
 * @brief   Digital I/O modes.
 */
typedef uint16_t iomode_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 uint32_t ioportid_t;

/**
 * @brief   SIUL register initializer type.
 */
typedef struct {
  uint8_t                   pcr_index;
  uint8_t                   gpdo_value;
  iomode_t                  pcr_value;
} spc_siu_init_t;

/**
 * @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.
 */
typedef struct {
  iomode_t                  default_mode;
  const spc_siu_init_t      *inits;
  const uint8_t             *padsels;
} PALConfig;

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

/**
 * @brief   I/O port A identifier.
 */
#define PORT_A          0

/**
 * @brief   I/O port B identifier.
 */
#define PORT_B          1

/**
 * @brief   I/O port C identifier.
 */
#define PORT_C          2

/**
 * @brief   I/O port D identifier.
 */
#define PORT_D          3

/**
 * @brief   I/O port E identifier.
 */
#define PORT_E          4

/**
 * @brief   I/O port F identifier.
 */
#define PORT_F          5

/**
 * @brief   I/O port G identifier.
 */
#define PORT_G          6

/**
 * @brief   I/O port H identifier.
 */
#define PORT_H          7

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

/**
 * @brief   Port bit helper macro.
 * @note    Overrides the one in @p pal.h.
 *
 * @param[in] n         bit position within the port
 *
 * @return              The bit mask.
 */
#define PAL_PORT_BIT(n) ((ioportmask_t)(0x8000U >> (n)))

/**
 * @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) (((volatile uint16_t *)SIU.PGPDI)[port])

/**
 * @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) (((volatile uint16_t *)SIU.PGPDO)[port])

/**
 * @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)                                       \
    (((volatile uint16_t *)SIU.PGPDO)[port] = (bits))

/**
 * @brief   Reads a group of bits.
 *
 * @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)                               \
  _pal_lld_readgroup(port, mask, offset)

/**
 * @brief   Writes a group of bits.
 *
 * @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)                        \
  _pal_lld_writegroup(port, mask, offset, 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   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)                                          \
  (SIU.GPDI[((port) * 16) + (pad)].R)

/**
 * @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)                                    \
  (SIU.GPDO[((port) * 16) + (pad)].R = (bit))

/**
 * @brief   Sets a pad logical state to @p PAL_HIGH.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 *
 * @notapi
 */
#define pal_lld_setpad(port, pad)                                           \
    (SIU.GPDO[((port) * 16) + (pad)].R = 1)

/**
 * @brief   Clears a pad logical state to @p PAL_LOW.
 *
 * @param[in] port      port identifier
 * @param[in] pad       pad number within the port
 *
 * @notapi
 */
#define pal_lld_clearpad(port, pad)                                         \
    (SIU.GPDO[((port) * 16) + (pad)].R = 0)

/**
 * @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)                                        \
    (SIU.GPDO[((port) * 16) + (pad)].R = ~SIU.GPDO[((port) * 16) + (pad)].R)

/**
 * @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)

extern const PALConfig pal_default_config;

#ifdef __cplusplus
extern "C" {
#endif
  void _pal_lld_init(const PALConfig *config);
  ioportmask_t _pal_lld_readgroup(ioportid_t port,
                                  ioportmask_t mask,
                                  uint_fast8_t offset);
  void _pal_lld_writegroup(ioportid_t port,
                           ioportmask_t mask,
                           uint_fast8_t offset,
                           ioportmask_t bits);
  void _pal_lld_setgroupmode(ioportid_t port,
                             ioportmask_t mask,
                             iomode_t mode);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_PAL */

#endif /* _PAL_LLD_H_ */

/** @} */