/*
    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/OTGv1/usb_lld.c
 * @brief   STM32 USB subsystem low level driver source.
 *
 * @addtogroup USB
 * @{
 */

#include <string.h>

#include "ch.h"
#include "hal.h"

#if HAL_USE_USB || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver local definitions.                                                 */
/*===========================================================================*/

#define TRDT_VALUE      5

/*===========================================================================*/
/* Driver exported variables.                                                */
/*===========================================================================*/

/** @brief OTG1 driver identifier.*/
#if STM32_USB_USE_OTG1 || defined(__DOXYGEN__)
USBDriver USBD1;
#endif

/*===========================================================================*/
/* Driver local variables.                                                   */
/*===========================================================================*/

/**
 * @brief   EP0 state.
 * @note    It is an union because IN and OUT endpoints are never used at the
 *          same time for EP0.
 */
static union {
  /**
   * @brief   IN EP0 state.
   */
  USBInEndpointState in;
  /**
   * @brief   OUT EP0 state.
   */
  USBOutEndpointState out;
} ep0_state;

/**
 * @brief   EP0 initialization structure.
 */
static const USBEndpointConfig ep0config = {
  USB_EP_MODE_TYPE_CTRL | USB_EP_MODE_TRANSACTION,
  _usb_ep0setup,
  _usb_ep0in,
  _usb_ep0out,
  0x40,
  0x40,
  &ep0_state.in,
  &ep0_state.out
};

/*===========================================================================*/
/* Driver local functions.                                                   */
/*===========================================================================*/

/**
 * @brief   Resets the RX FIFO memory allocator.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 */
static void rxfifo_reset(USBDriver *usbp) {

}

/**
 * @brief   Resets the RX FIFO memory allocator.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] size      size of the packet buffer to allocate
 */
static uint32_t rxfifo_alloc(USBDriver *usbp, size_t size) {

  return 0;
}

/*===========================================================================*/
/* Driver interrupt handlers.                                                */
/*===========================================================================*/

#if STM32_USB_USE_OTG1 || defined(__DOXYGEN__)
/**
 * @brief   OTG1 interrupt handler.
 *
 * @isr
 */
CH_IRQ_HANDLER(OTG_FS_IRQHandler) {

  CH_IRQ_PROLOGUE();

  CH_IRQ_EPILOGUE();
}
#endif

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/

/**
 * @brief   Low level USB driver initialization.
 *
 * @notapi
 */
void usb_lld_init(void) {

  /* Driver initialization.*/
  usbObjectInit(&USBD1);
}

/**
 * @brief   Configures and activates the USB peripheral.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 *
 * @notapi
 */
void usb_lld_start(USBDriver *usbp) {

  if (usbp->state == USB_STOP) {
    /* Clock activation.*/
#if STM32_USB_USE_OTG1
    if (&USBD1 == usbp) {
      /* OTG FS clock enable and reset.*/
      rccEnableOTG1(FALSE);
      rccResetOTG1();

      /* Enables IRQ vector.*/
      nvicEnableVector(OTG_FS_IRQn,
                       CORTEX_PRIORITY_MASK(STM32_USB_OTG1_IRQ_PRIORITY));
    }
#endif

    /* Wait AHB idle condition.*/
    while ((OTG->GRSTCTL & GRSTCTL_AHBIDL) == 0)
      ;

    /* Core reset and delay of at least 3 PHY cycles.*/
    OTG->GRSTCTL = GRSTCTL_CSRST;
    while ((OTG->GRSTCTL & GRSTCTL_CSRST) != 0)
      ;
    halPolledDelay(12);

    /* - Forced device mode.
       - USB turnaroudn time = TRDT_VALUE.
       - Full Speed 1.1 PHY.*/
    OTG->GUSBCFG = GUSBCFG_FDMOD | GUSBCFG_TRDT(TRDT_VALUE) | GUSBCFG_PHYSEL;

    /* Interrupt on TXFIFOs empty.*/
    OTG->GAHBCFG = GAHBCFG_PTXFELVL | GAHBCFG_TXFELVL;

    /* 48MHz 1.1 PHY.*/
    OTG->DCFG = 0x02200000 |  DCFG_PFIVL(0) | DCFG_DSPD_FS11;

    /* PHY enabled.*/
    OTG->PCGCCTL = 0;

    /* Receive FIFO size initialization, the address is always zero.*/
    OTG->GRXFSIZ = STM32_USB_OTG1_RX_FIFO_SIZE / 4;

    /* EP0 TX FIFO initialization.*/

    /* Endpoints reinitialization.*/

    /* Clear all pending Device Interrupts, only the USB Reset interrupt
       is required initially.*/
    OTG->DIEPMSK  = 0;
    OTG->DOEPMSK  = 0;
    OTG->DAINTMSK = 0;
    OTG->GINTMSK  = GINTMSK_USBRSTM;
    OTG->GINTSTS  = 0xFFFFFFFF;

    /* Global interrupts enable.*/
    OTG->GAHBCFG |= GAHBCFG_GINTMSK;
  }
  /* Configuration.*/
}

/**
 * @brief   Deactivates the USB peripheral.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 *
 * @notapi
 */
void usb_lld_stop(USBDriver *usbp) {

  /* If in ready state then disables the USB clock.*/
  if (usbp->state == USB_STOP) {
#if STM32_USB_USE_USB1
    if (&USBD1 == usbp) {
      nvicDisableVector(OTG_FS_IRQn);
      rccDisableOTG1(FALSE);
    }
#endif
  }
}

/**
 * @brief   USB low level reset routine.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 *
 * @notapi
 */
void usb_lld_reset(USBDriver *usbp) {
  uint32_t cntr;

  /* Post reset initialization.*/

  /* Resets the packet memory allocator.*/
  rxfifo_reset(usbp);

  /* EP0 initialization.*/
  usbp->epc[0] = &ep0config;
  usb_lld_init_endpoint(usbp, 0);
}

/**
 * @brief   Sets the USB address.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 *
 * @notapi
 */
void usb_lld_set_address(USBDriver *usbp) {

}

/**
 * @brief   Enables an endpoint.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 *
 * @notapi
 */
void usb_lld_init_endpoint(USBDriver *usbp, usbep_t ep) {

}

/**
 * @brief   Disables all the active endpoints except the endpoint zero.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 *
 * @notapi
 */
void usb_lld_disable_endpoints(USBDriver *usbp) {

}

/**
 * @brief   Returns the status of an OUT endpoint.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 * @return              The endpoint status.
 * @retval EP_STATUS_DISABLED The endpoint is not active.
 * @retval EP_STATUS_STALLED  The endpoint is stalled.
 * @retval EP_STATUS_ACTIVE   The endpoint is active.
 *
 * @notapi
 */
usbepstatus_t usb_lld_get_status_out(USBDriver *usbp, usbep_t ep) {

}

/**
 * @brief   Returns the status of an IN endpoint.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 * @return              The endpoint status.
 * @retval EP_STATUS_DISABLED The endpoint is not active.
 * @retval EP_STATUS_STALLED  The endpoint is stalled.
 * @retval EP_STATUS_ACTIVE   The endpoint is active.
 *
 * @notapi
 */
usbepstatus_t usb_lld_get_status_in(USBDriver *usbp, usbep_t ep) {

}

/**
 * @brief   Reads a setup packet from the dedicated packet buffer.
 * @details This function must be invoked in the context of the @p setup_cb
 *          callback in order to read the received setup packet.
 * @pre     In order to use this function the endpoint must have been
 *          initialized as a control endpoint.
 * @post    The endpoint is ready to accept another packet.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 * @param[out] buf      buffer where to copy the packet data
 *
 * @notapi
 */
void usb_lld_read_setup(USBDriver *usbp, usbep_t ep, uint8_t *buf) {

}

/**
 * @brief   Reads from a dedicated packet buffer.
 * @pre     In order to use this function he endpoint must have been
 *          initialized in packet mode.
 * @note    This function can be invoked both in thread and IRQ context.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 * @param[out] buf      buffer where to copy the packet data
 * @param[in] n         maximum number of bytes to copy. This value must
 *                      not exceed the maximum packet size for this endpoint.
 * @return              The received packet size regardless the specified
 *                      @p n parameter.
 * @retval 0            Zero size packet received.
 *
 * @notapi
 */
size_t usb_lld_read_packet_buffer(USBDriver *usbp, usbep_t ep,
                                  uint8_t *buf, size_t n) {

  return 0;
}

/**
 * @brief   Writes to a dedicated packet buffer.
 * @pre     In order to use this function he endpoint must have been
 *          initialized in packet mode.
 * @note    This function can be invoked both in thread and IRQ context.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 * @param[in] buf       buffer where to fetch the packet data
 * @param[in] n         maximum number of bytes to copy. This value must
 *                      not exceed the maximum packet size for this endpoint.
 *
 * @notapi
 */
void usb_lld_write_packet_buffer(USBDriver *usbp, usbep_t ep,
                                 const uint8_t *buf, size_t n) {

}

/**
 * @brief   Prepares for a receive operation.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 * @param[out] buf      buffer where to copy the received data
 * @param[in] n         maximum number of bytes to copy
 *
 * @notapi
 */
void usb_lld_prepare_receive(USBDriver *usbp, usbep_t ep,
                             uint8_t *buf, size_t n) {

}

/**
 * @brief   Prepares for a transmit operation.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 * @param[in] buf       buffer where to fetch the data to be transmitted
 * @param[in] n         maximum number of bytes to copy
 *
 * @notapi
 */
void usb_lld_prepare_transmit(USBDriver *usbp, usbep_t ep,
                              const uint8_t *buf, size_t n) {

}

/**
 * @brief   Starts a receive operation on an OUT endpoint.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 *
 * @notapi
 */
void usb_lld_start_out(USBDriver *usbp, usbep_t ep) {

  (void)usbp;

}

/**
 * @brief   Starts a transmit operation on an IN endpoint.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 *
 * @notapi
 */
void usb_lld_start_in(USBDriver *usbp, usbep_t ep) {

  (void)usbp;

}

/**
 * @brief   Brings an OUT endpoint in the stalled state.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 *
 * @notapi
 */
void usb_lld_stall_out(USBDriver *usbp, usbep_t ep) {

  (void)usbp;

}

/**
 * @brief   Brings an IN endpoint in the stalled state.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 *
 * @notapi
 */
void usb_lld_stall_in(USBDriver *usbp, usbep_t ep) {

  (void)usbp;

}

/**
 * @brief   Brings an OUT endpoint in the active state.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 *
 * @notapi
 */
void usb_lld_clear_out(USBDriver *usbp, usbep_t ep) {

  (void)usbp;

}

/**
 * @brief   Brings an IN endpoint in the active state.
 *
 * @param[in] usbp      pointer to the @p USBDriver object
 * @param[in] ep        endpoint number
 *
 * @notapi
 */
void usb_lld_clear_in(USBDriver *usbp, usbep_t ep) {

  (void)usbp;

}

#endif /* HAL_USE_USB */

/** @} */