/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012 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/GPIOv2/pal_lld.h
 * @brief   STM32L1xx/STM32F2xx/STM32F4xx GPIO 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    STM32-specific I/O mode flags
 * @{
 */
#define PAL_STM32_MODE_MASK             (3 << 0)
#define PAL_STM32_MODE_INPUT            (0 << 0)
#define PAL_STM32_MODE_OUTPUT           (1 << 0)
#define PAL_STM32_MODE_ALTERNATE        (2 << 0)
#define PAL_STM32_MODE_ANALOG           (3 << 0)

#define PAL_STM32_OTYPE_MASK            (1 << 2)
#define PAL_STM32_OTYPE_PUSHPULL        (0 << 2)
#define PAL_STM32_OTYPE_OPENDRAIN       (1 << 2)

#define PAL_STM32_OSPEED_MASK           (3 << 3)
#define PAL_STM32_OSPEED_LOWEST         (0 << 3)
#define PAL_STM32_OSPEED_MID1           (1 << 3)
#define PAL_STM32_OSPEED_MID2           (2 << 3)
#define PAL_STM32_OSPEED_HIGHEST        (3 << 3)

#define PAL_STM32_PUDR_MASK             (3 << 5)
#define PAL_STM32_PUDR_FLOATING         (0 << 5)
#define PAL_STM32_PUDR_PULLUP           (1 << 5)
#define PAL_STM32_PUDR_PULLDOWN         (2 << 5)

#define PAL_STM32_ALTERNATE_MASK        (15 << 7)
#define PAL_STM32_ALTERNATE(n)          ((n) << 7)

/**
 * @brief   Alternate function.
 *
 * @param[in] n         alternate function selector
 */
#define PAL_MODE_ALTERNATE(n)           (PAL_STM32_MODE_ALTERNATE |         \
                                         PAL_STM32_ALTERNATE(n))
/** @} */

/**
 * @name    Standard I/O mode flags
 * @{
 */
/**
 * @brief   This mode is implemented as input.
 */
#define PAL_MODE_RESET                  PAL_STM32_MODE_INPUT

/**
 * @brief   This mode is implemented as output.
 */
#define PAL_MODE_UNCONNECTED            PAL_STM32_MODE_OUTPUT

/**
 * @brief   Regular input high-Z pad.
 */
#define PAL_MODE_INPUT                  PAL_STM32_MODE_INPUT

/**
 * @brief   Input pad with weak pull up resistor.
 */
#define PAL_MODE_INPUT_PULLUP           (PAL_STM32_MODE_INPUT |             \
                                         PAL_STM32_PUDR_PULLUP)

/**
 * @brief   Input pad with weak pull down resistor.
 */
#define PAL_MODE_INPUT_PULLDOWN         (PAL_STM32_MODE_INPUT |             \
                                         PAL_STM32_PUDR_PULLDOWN)

/**
 * @brief   Analog input mode.
 */
#define PAL_MODE_INPUT_ANALOG           PAL_STM32_MODE_ANALOG

/**
 * @brief   Push-pull output pad.
 */
#define PAL_MODE_OUTPUT_PUSHPULL        (PAL_STM32_MODE_OUTPUT |            \
                                         PAL_STM32_OTYPE_PUSHPULL)

/**
 * @brief   Open-drain output pad.
 */
#define PAL_MODE_OUTPUT_OPENDRAIN       (PAL_STM32_MODE_OUTPUT |            \
                                         PAL_STM32_OTYPE_OPENDRAIN)
/** @} */

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

/**
 * @brief   STM32 GPIO registers block.
 */
typedef struct {

  volatile uint32_t     MODER;
  volatile uint32_t     OTYPER;
  volatile uint32_t     OSPEEDR;
  volatile uint32_t     PUPDR;
  volatile uint32_t     IDR;
  volatile uint32_t     ODR;
  volatile union {
    uint32_t            W;
    struct {
      uint16_t          set;
      uint16_t          clear;
    } H;
  } BSRR;
  volatile uint32_t     LCKR;
  volatile uint32_t     AFRL;
  volatile uint32_t     AFRH;
} GPIO_TypeDef;

/**
 * @brief   GPIO port setup info.
 */
typedef struct {
  /** Initial value for MODER register.*/
  uint32_t              moder;
  /** Initial value for OTYPER register.*/
  uint32_t              otyper;
  /** Initial value for OSPEEDR register.*/
  uint32_t              ospeedr;
  /** Initial value for PUPDR register.*/
  uint32_t              pupdr;
  /** Initial value for ODR register.*/
  uint32_t              odr;
  /** Initial value for AFRL register.*/
  uint32_t              afrl;
  /** Initial value for AFRH register.*/
  uint32_t              afrh;
} stm32_gpio_setup_t;

/**
 * @brief   STM32 GPIO static initializer.
 * @details An instance of this structure must be passed to @p palInit() at
 *          system startup time in order to initialize 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 Port A setup data.*/
  stm32_gpio_setup_t    PAData;
  /** @brief Port B setup data.*/
  stm32_gpio_setup_t    PBData;
  /** @brief Port C setup data.*/
  stm32_gpio_setup_t    PCData;
  /** @brief Port D setup data.*/
  stm32_gpio_setup_t    PDData;
#if STM32_HAS_GPIOE
  /** @brief Port E setup data.*/
  stm32_gpio_setup_t    PEData;
#endif
#if STM32_HAS_GPIOF
  /** @brief Port F setup data.*/
  stm32_gpio_setup_t    PFData;
#endif
#if STM32_HAS_GPIOG
  /** @brief Port G setup data.*/
  stm32_gpio_setup_t    PGData;
#endif
#if STM32_HAS_GPIOH
  /** @brief Port H setup data.*/
  stm32_gpio_setup_t    PHData;
#endif
#if STM32_HAS_GPIOI
  /** @brief Port I setup data.*/
  stm32_gpio_setup_t    PIData;
#endif
} PALConfig;

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

/**
 * @brief   Whole port mask.
 * @details 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 uint32_t ioportmask_t;

/**
 * @brief   Digital I/O modes.
 */
typedef uint32_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 GPIO_TypeDef * ioportid_t;

/*===========================================================================*/
/* I/O Ports Identifiers.                                                    */
/* The low level driver wraps the definitions already present in the STM32   */
/* firmware library.                                                         */
/*===========================================================================*/

/**
 * @brief   GPIO port A identifier.
 */
#if STM32_HAS_GPIOA || defined(__DOXYGEN__)
#define IOPORT1         GPIOA
#endif

/**
 * @brief   GPIO port B identifier.
 */
#if STM32_HAS_GPIOB || defined(__DOXYGEN__)
#define IOPORT2         GPIOB
#endif

/**
 * @brief   GPIO port C identifier.
 */
#if STM32_HAS_GPIOC || defined(__DOXYGEN__)
#define IOPORT3         GPIOC
#endif

/**
 * @brief   GPIO port D identifier.
 */
#if STM32_HAS_GPIOD || defined(__DOXYGEN__)
#define IOPORT4         GPIOD
#endif

/**
 * @brief   GPIO port E identifier.
 */
#if STM32_HAS_GPIOE || defined(__DOXYGEN__)
#define IOPORT5         GPIOE
#endif

/**
 * @brief   GPIO port F identifier.
 */
#if STM32_HAS_GPIOF || defined(__DOXYGEN__)
#define IOPORT6         GPIOF
#endif

/**
 * @brief   GPIO port G identifier.
 */
#if STM32_HAS_GPIOG || defined(__DOXYGEN__)
#define IOPORT7         GPIOG
#endif

/**
 * @brief   GPIO port H identifier.
 */
#if STM32_HAS_GPIOH || defined(__DOXYGEN__)
#define IOPORT8         GPIOH
#endif

/**
 * @brief   GPIO port I identifier.
 */
#if STM32_HAS_GPIOI || defined(__DOXYGEN__)
#define IOPORT9         GPIOI
#endif

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

/**
 * @brief   GPIO ports subsystem initialization.
 *
 * @notapi
 */
#define pal_lld_init(config) _pal_lld_init(config)

/**
 * @brief   Reads an I/O port.
 * @details This function is implemented by reading the GPIO IDR register, the
 *          implementation has no side effects.
 * @note    This function is not meant to be invoked directly by the application
 *          code.
 *
 * @param[in] port      port identifier
 * @return              The port bits.
 *
 * @notapi
 */
#define pal_lld_readport(port) ((port)->IDR)

/**
 * @brief   Reads the output latch.
 * @details This function is implemented by reading the GPIO ODR register, the
 *          implementation has no side effects.
 * @note    This function is not meant to be invoked directly by the application
 *          code.
 *
 * @param[in] port      port identifier
 * @return              The latched logical states.
 *
 * @notapi
 */
#define pal_lld_readlatch(port) ((port)->ODR)

/**
 * @brief   Writes on a I/O port.
 * @details This function is implemented by writing the GPIO ODR register, the
 *          implementation has no side effects.
 * @note    Writing on pads programmed as pull-up or pull-down has the side
 *          effect to modify the resistor setting because the output latched
 *          data is used for the resistor selection.
 *
 * @param[in] port      port identifier
 * @param[in] bits      bits to be written on the specified port
 *
 * @notapi
 */
#define pal_lld_writeport(port, bits) ((port)->ODR = (bits))

/**
 * @brief   Sets a bits mask on a I/O port.
 * @details This function is implemented by writing the GPIO BSRR register, the
 *          implementation has no side effects.
 * @note    Writing on pads programmed as pull-up or pull-down has the side
 *          effect to modify the resistor setting because the output latched
 *          data is used for the resistor selection.
 *
 * @param[in] port      port identifier
 * @param[in] bits      bits to be ORed on the specified port
 *
 * @notapi
 */
#define pal_lld_setport(port, bits) ((port)->BSRR.H.set = (uint16_t)(bits))

/**
 * @brief   Clears a bits mask on a I/O port.
 * @details This function is implemented by writing the GPIO BSRR register, the
 *          implementation has no side effects.
 * @note    Writing on pads programmed as pull-up or pull-down has the side
 *          effect to modify the resistor setting because the output latched
 *          data is used for the resistor selection.
 *
 * @param[in] port      port identifier
 * @param[in] bits      bits to be cleared on the specified port
 *
 * @notapi
 */
#define pal_lld_clearport(port, bits) ((port)->BSRR.H.clear = (uint16_t)(bits))

/**
 * @brief   Writes a group of bits.
 * @details This function is implemented by writing the GPIO BSRR register, the
 *          implementation has no side effects.
 * @note    Writing on pads programmed as pull-up or pull-down has the side
 *          effect to modify the resistor setting because the output latched
 *          data is used for the resistor selection.
 *
 * @param[in] port      port identifier
 * @param[in] mask      group mask
 * @param[in] offset    the 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)                        \
  ((port)->BSRR.W = ((~(bits) & (mask)) << (16 + (offset))) |               \
                     (((bits) & (mask)) << (offset)))

/**
 * @brief   Pads group mode setup.
 * @details This function programs a pads group belonging to the same port
 *          with the specified mode.
 * @note    Writing on pads programmed as pull-up or pull-down has the side
 *          effect to modify the resistor setting because the output latched
 *          data is used for the resistor selection.
 *
 * @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   Writes a logical state on an output pad.
 * @note    Writing on pads programmed as pull-up or pull-down has the side
 *          effect to modify the resistor setting because the output latched
 *          data is used for the resistor selection.
 *
 * @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) pal_lld_writegroup(port, 1, pad, bit)

extern const PALConfig pal_default_config;

#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 */

#endif /* _PAL_LLD_H_ */

/** @} */