/**************************************************************************/
/*!
    @file     dcd_nrf52.c
    @author   hathach

    @section LICENSE

    Software License Agreement (BSD License)

    Copyright (c) 2018, hathach (tinyusb.org)
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:
    1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
    3. Neither the name of the copyright holders nor the
    names of its contributors may be used to endorse or promote products
    derived from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**************************************************************************/

// TODO remove
#include "nrf.h"
#include "nrf_power.h"
#include "nrf_usbd.h"

#include "tusb_dcd.h"

/*------------------------------------------------------------------*/
/* MACRO TYPEDEF CONSTANT ENUM
 *------------------------------------------------------------------*/

/*------------------------------------------------------------------*/
/* VARIABLE DECLARATION
 *------------------------------------------------------------------*/

/*------------------------------------------------------------------*/
/* Controller API
 *------------------------------------------------------------------*/
static void hfclk_ready(nrf_drv_clock_evt_type_t event)
{

}

static void enable_usb(void)
{
  /* Prepare for READY event receiving */
  nrf_usbd_eventcause_clear(NRF_USBD_EVENTCAUSE_READY_MASK);

  /* Enable the peripheral */
  nrf_usbd_enable();

  // Enable HFCLK
  nrf_drv_clock_handler_item_t clock_handler_item =
  {
      .event_handler = hfclk_ready
  };
  nrf_drv_clock_hfclk_request(&clock_handler_item);

  /* Waiting for peripheral to enable, this should take a few us */
  while ( 0 == (NRF_USBD_EVENTCAUSE_READY_MASK & nrf_usbd_eventcause_get()) ) { }
  nrf_usbd_eventcause_clear(NRF_USBD_EVENTCAUSE_READY_MASK);

  // Wait until power is ready
  while (!nrf_power_usbregstatus_outrdy_get()) {}

  // Wait until PHY is powered
  while ( nrf_drv_clock_hfclk_is_running() ) {}

  if ( nrf_drv_usbd_errata_166() )
  {
    *((volatile uint32_t *) (NRF_USBD_BASE + 0x800)) = 0x7E3;
    *((volatile uint32_t *) (NRF_USBD_BASE + 0x804)) = 0x40;
    __ISB();
    __DSB();
  }

  nrf_usbd_isosplit_set(NRF_USBD_ISOSPLIT_Half);

  // Enable interrupt
  NRF_USBD->INTENSET = USBD_INTEN_USBRESET_Msk | USBD_INTEN_STARTED_Msk |
      USBD_INTEN_ENDEPIN0_Msk | USBD_INTEN_EP0DATADONE_Msk | USBD_INTEN_ENDEPOUT0_Msk | USBD_INTEN_EP0SETUP_Msk |
      USBD_INTEN_USBEVENT_Msk | USBD_INTEN_EPDATA_Msk | USBD_INTEN_ACCESSFAULT_Msk;
      //USBD_INTEN_SOF_Msk

//  if (enable_sof || nrf_drv_usbd_errata_104())
//  {
//    ints_to_enable |= NRF_USBD_INT_SOF_MASK;
//  }

  // Enable interrupt
  NVIC_ClearPendingIRQ(USBD_IRQn);
  NVIC_EnableIRQ(USBD_IRQn);

  // Enable pull up
  nrf_usbd_pullup_enable();
}

static void power_usb_event_handler(nrf_drv_power_usb_evt_t event)
{
  switch ( event )
  {
    case NRF_DRV_POWER_USB_EVT_DETECTED:
      if ( !NRF_USBD->ENABLE )
      {
        enable_usb();
      }
    break;

    case NRF_DRV_POWER_USB_EVT_REMOVED:
      if ( NRF_USBD->ENABLE )
      {
        nrf_drv_usbd_stop();

        NRF_USBD->INTENCLR = NRF_USBD->INTEN; // disable all interrupt
        nrf_usbd_disable();
      }
    break;

    case NRF_DRV_POWER_USB_EVT_READY:
    break;

    default: break;
  }
}

bool tusb_dcd_init (uint8_t port)
{
  // USB Power detection
  const nrf_drv_power_usbevt_config_t config =
  {
      .handler = power_usb_event_handler
  };
  VERIFY( NRF_SUCCESS == nrf_drv_power_usbevt_init(&config) );
}

void tusb_dcd_connect          (uint8_t port);
void tusb_dcd_disconnect       (uint8_t port);
void tusb_dcd_set_address      (uint8_t port, uint8_t dev_addr);
void tusb_dcd_set_config       (uint8_t port, uint8_t config_num);

void USBD_IRQHandler(void)
{
  uint32_t const inten  = NRF_USBD->INTEN;
  uint32_t int_status = 0;

  volatile uint32_t* regclr = &NRF_USBD->EVENTS_USBRESET;

  for(int i=0; i<32; i++)
  {
    if ( BIT_TEST_(inten, i) && regclr[i]  )
    {
      int_status |= BIT_(i);

      // nrf_usbd_event_clear()
      regclr[i] = 0;
      __ISB();
      __DSB();
    }
  }

#if 0
    if (nrf_drv_usbd_errata_104())
    {
        /* Event correcting */
        if ((0 == m_dma_pending) && (0 != (active & (USBD_INTEN_SOF_Msk))))
        {
            uint8_t usbi, uoi, uii;
            /* Testing */
            *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7A9;
            uii = (uint8_t)(*((volatile uint32_t *)(NRF_USBD_BASE + 0x804)));
            if (0 != uii)
            {
                uii &= (uint8_t)(*((volatile uint32_t *)(NRF_USBD_BASE + 0x804)));
            }

            *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7AA;
            uoi = (uint8_t)(*((volatile uint32_t *)(NRF_USBD_BASE + 0x804)));
            if (0 != uoi)
            {
                uoi &= (uint8_t)(*((volatile uint32_t *)(NRF_USBD_BASE + 0x804)));
            }
            *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7AB;
            usbi = (uint8_t)(*((volatile uint32_t *)(NRF_USBD_BASE + 0x804)));
            if (0 != usbi)
            {
                usbi &= (uint8_t)(*((volatile uint32_t *)(NRF_USBD_BASE + 0x804)));
            }
            /* Processing */
            *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7AC;
            uii &= (uint8_t)*((volatile uint32_t *)(NRF_USBD_BASE + 0x804));
            if (0 != uii)
            {
                uint8_t rb;
                m_simulated_dataepstatus |= ((uint32_t)uii) << USBD_EPIN_BITPOS_0;
                *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7A9;
                *((volatile uint32_t *)(NRF_USBD_BASE + 0x804)) = uii;
                rb = (uint8_t)*((volatile uint32_t *)(NRF_USBD_BASE + 0x804));
            NRF_DRV_USBD_LOG_PROTO1_FIX_PRINTF("   uii: 0x%.2x (0x%.2x)", uii, rb);
            }

            *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7AD;
            uoi &= (uint8_t)*((volatile uint32_t *)(NRF_USBD_BASE + 0x804));
            if (0 != uoi)
            {
                uint8_t rb;
                m_simulated_dataepstatus |= ((uint32_t)uoi) << USBD_EPOUT_BITPOS_0;
                *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7AA;
                *((volatile uint32_t *)(NRF_USBD_BASE + 0x804)) = uoi;
                rb = (uint8_t)*((volatile uint32_t *)(NRF_USBD_BASE + 0x804));
            NRF_DRV_USBD_LOG_PROTO1_FIX_PRINTF("   uoi: 0x%.2u (0x%.2x)", uoi, rb);
            }

            *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7AE;
            usbi &= (uint8_t)*((volatile uint32_t *)(NRF_USBD_BASE + 0x804));
            if (0 != usbi)
            {
                uint8_t rb;
                if (usbi & 0x01)
                {
                    active |= USBD_INTEN_EP0SETUP_Msk;
                }
                if (usbi & 0x10)
                {
                    active |= USBD_INTEN_USBRESET_Msk;
                }
                *((volatile uint32_t *)(NRF_USBD_BASE + 0x800)) = 0x7AB;
                *((volatile uint32_t *)(NRF_USBD_BASE + 0x804)) = usbi;
                rb = (uint8_t)*((volatile uint32_t *)(NRF_USBD_BASE + 0x804));
            NRF_DRV_USBD_LOG_PROTO1_FIX_PRINTF("   usbi: 0x%.2u (0x%.2x)", usbi, rb);
            }

            if (0 != (m_simulated_dataepstatus &
                ~((1U << USBD_EPOUT_BITPOS_0) | (1U << USBD_EPIN_BITPOS_0))))
            {
                active |= enabled & NRF_USBD_INT_DATAEP_MASK;
            }
            if (0 != (m_simulated_dataepstatus &
                ((1U << USBD_EPOUT_BITPOS_0) | (1U << USBD_EPIN_BITPOS_0))))
            {
                if (0 != (enabled & NRF_USBD_INT_EP0DATADONE_MASK))
                {
                    m_simulated_dataepstatus &=
                        ~((1U << USBD_EPOUT_BITPOS_0) | (1U << USBD_EPIN_BITPOS_0));
                    active |= NRF_USBD_INT_EP0DATADONE_MASK;
                }
            }
        }
    }
#endif

    /*------------- Interrupt Processing -------------*/

    if ( int_status & USBD_INTEN_USBRESET_Msk )
    {


      tusb_dcd_bus_event(0, USBD_BUS_EVENT_RESET);
    }
}