/**************************************************************************/
/*!
    @file     ohci.c
    @author   hathach (tinyusb.org)

    @section LICENSE

    Software License Agreement (BSD License)

    Copyright (c) 2013, 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.

    This file is part of the tinyusb stack.
*/
/**************************************************************************/

#include "common/common.h"

#if MODE_HOST_SUPPORTED && (TUSB_CFG_MCU == MCU_LPC175X_6X)
//--------------------------------------------------------------------+
// INCLUDE
//--------------------------------------------------------------------+
#include "hal/hal.h"
#include "osal/osal.h"
#include "common/timeout_timer.h"

#include "../hcd.h"
#include "../usbh_hcd.h"
#include "ohci.h"

//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF
//--------------------------------------------------------------------+
#define OHCI_REG               ((ohci_registers_t *) LPC_USB_BASE)

enum {
  OHCI_CONTROL_FUNCSTATE_RESET = 0,
  OHCI_CONTROL_FUNCSTATE_RESUME,
  OHCI_CONTROL_FUNCSTATE_OPERATIONAL,
  OHCI_CONTROL_FUNCSTATE_SUSPEND
};

enum {
  OHCI_CONTROL_CONTROL_BULK_RATIO           = 3,
  OHCI_CONTROL_LIST_PERIODIC_ENABLE_MASK    = BIT_(2),
  OHCI_CONTROL_LIST_ISOCHRONOUS_ENABLE_MASK = BIT_(3),
  OHCI_CONTROL_LIST_CONTROL_ENABLE_MASK     = BIT_(4),
  OHCI_CONTROL_LIST_BULK_ENABLE_MASK        = BIT_(5),
};

enum {
  OHCI_FMINTERVAL_FI    = 0x2EDF, // 7.3.1 nominal (reset) value
  OHCI_FMINTERVAL_FSMPS = (6*(OHCI_FMINTERVAL_FI-210)) / 7, // 5.4 calculated based on maximum overhead + bit stuffing
};

enum {
  OHCI_PERIODIC_START = 0x3E67
};

enum {
  OHCI_INT_SCHEDULING_OVERUN_MASK    = BIT_(0),
  OHCI_INT_WRITEBACK_DONEHEAD_MASK   = BIT_(1),
  OHCI_INT_SOF_MASK                  = BIT_(2),
  OHCI_INT_RESUME_DETECTED_MASK      = BIT_(3),
  OHCI_INT_UNRECOVERABLE_ERROR_MASK  = BIT_(4),
  OHCI_INT_FRAME_OVERFLOW_MASK       = BIT_(5),
  OHCI_INT_RHPORT_STATUS_CHANGE_MASK = BIT_(6),

  OHCI_INT_OWNERSHIP_CHANGE_MASK     = BIT_(30),
  OHCI_INT_MASTER_ENABLE_MASK        = BIT_(31),
};

enum {
  OHCI_RHPORT_CURRENT_CONNECT_STATUS_MASK      = BIT_(0),
  OHCI_RHPORT_PORT_ENABLE_STATUS_MASK          = BIT_(1),
  OHCI_RHPORT_PORT_SUSPEND_STATUS_MASK         = BIT_(2),
  OHCI_RHPORT_PORT_OVER_CURRENT_INDICATOR_MASK = BIT_(3),
  OHCI_RHPORT_PORT_RESET_STATUS_MASK           = BIT_(4), ///< write '1' to reset port

  OHCI_RHPORT_PORT_POWER_STATUS_MASK           = BIT_(8),
  OHCI_RHPORT_LOW_SPEED_DEVICE_ATTACHED_MASK   = BIT_(9),

  OHCI_RHPORT_CONNECT_STATUS_CHANGE_MASK       = BIT_(16),
  OHCI_RHPORT_PORT_ENABLE_CHANGE_MASK          = BIT_(17),
  OHCI_RHPORT_PORT_SUSPEND_CHANGE_MASK         = BIT_(18),
  OHCI_RHPORT_OVER_CURRENT_CHANGE_MASK         = BIT_(19),
  OHCI_RHPORT_PORT_RESET_CHANGE_MASK           = BIT_(20),

  OHCI_RHPORT_ALL_CHANGE_MASK = OHCI_RHPORT_CONNECT_STATUS_CHANGE_MASK | OHCI_RHPORT_PORT_ENABLE_CHANGE_MASK |
    OHCI_RHPORT_PORT_SUSPEND_CHANGE_MASK | OHCI_RHPORT_OVER_CURRENT_CHANGE_MASK | OHCI_RHPORT_PORT_RESET_CHANGE_MASK
};

enum {
  OHCI_CCODE_NO_ERROR              = 0,
  OHCI_CCODE_CRC                   = 1,
	OHCI_CCODE_BIT_STUFFING          = 2,
	OHCI_CCODE_DATA_TOGGLE_MISMATCH  = 3,
	OHCI_CCODE_STALL                 = 4,
	OHCI_CCODE_DEVICE_NOT_RESPONDING = 5,
	OHCI_CCODE_PID_CHECK_FAILURE     = 6,
	OHCI_CCODE_UNEXPECTED_PID        = 7,
	OHCI_CCODE_DATA_OVERRUN          = 8,
	OHCI_CCODE_DATA_UNDERRUN         = 9,
	OHCI_CCODE_BUFFER_OVERRUN        = 12,
	OHCI_CCODE_BUFFER_UNDERRUN       = 13,
	OHCI_CCODE_NOT_ACCESSED          = 14,
};

enum {
  OHCI_INT_ON_COMPLETE_YES = 0,
  OHCI_INT_ON_COMPLETE_NO  = BIN8(111)
};
//--------------------------------------------------------------------+
// INTERNAL OBJECT & FUNCTION DECLARATION
//--------------------------------------------------------------------+
ohci_data_t ohci_data TUSB_CFG_ATTR_USBRAM;

static void ed_list_insert(ohci_ed_t * p_pre, ohci_ed_t * p_ed);

//--------------------------------------------------------------------+
// USBH-HCD API
//--------------------------------------------------------------------+
// Initialization according to 5.1.1.4
tusb_error_t hcd_init(void)
{
  //------------- Data Structure init -------------//
  memclr_(&ohci_data, sizeof(ohci_data_t));

  ohci_data.control[0].ed.skip  = 1;
  ohci_data.bulk_head_ed.skip   = 1;
  ohci_data.period_head_ed.skip = 1;

  // reset controller
  OHCI_REG->command_status_bit.controller_reset = 1;
  while( OHCI_REG->command_status_bit.controller_reset ) {} // should not take longer than 10 us

  // TODO peridoic list build
  // TODO assign control, bulk head

  //------------- init ohci registers -------------//
  OHCI_REG->control_bit.hc_functional_state = OHCI_CONTROL_FUNCSTATE_OPERATIONAL; // move HC to operational state TODO use this to suspend (save power)

  OHCI_REG->frame_interval = (OHCI_FMINTERVAL_FSMPS << 16) | OHCI_FMINTERVAL_FI;
  OHCI_REG->periodic_start = (OHCI_FMINTERVAL_FI * 9) / 10; // Periodic start is 90% of frame interval

  OHCI_REG->control_head_ed = (uint32_t) &ohci_data.control[0].ed;
  OHCI_REG->bulk_head_ed    = (uint32_t) &ohci_data.bulk_head_ed;
  OHCI_REG->hcca            = (uint32_t) &ohci_data.hcca;

  OHCI_REG->control |= OHCI_CONTROL_CONTROL_BULK_RATIO | OHCI_CONTROL_LIST_CONTROL_ENABLE_MASK |
       OHCI_CONTROL_LIST_BULK_ENABLE_MASK; // TODO periodic enable

  OHCI_REG->rh_status_bit.local_power_status_change = 1; // set global power for ports

  OHCI_REG->interrupt_disable = OHCI_REG->interrupt_enable; // disable all interrupts
  OHCI_REG->interrupt_status  = OHCI_REG->interrupt_status; // clear current set bits
  OHCI_REG->interrupt_enable  = OHCI_INT_WRITEBACK_DONEHEAD_MASK | OHCI_INT_RESUME_DETECTED_MASK |
      OHCI_INT_UNRECOVERABLE_ERROR_MASK | OHCI_INT_FRAME_OVERFLOW_MASK | OHCI_INT_RHPORT_STATUS_CHANGE_MASK |
      OHCI_INT_MASTER_ENABLE_MASK;

  return TUSB_ERROR_NONE;
}

//--------------------------------------------------------------------+
// PORT API
//--------------------------------------------------------------------+
void hcd_port_reset(uint8_t hostid)
{
  OHCI_REG->rhport_status[0] = OHCI_RHPORT_PORT_RESET_STATUS_MASK;
}

bool hcd_port_connect_status(uint8_t hostid)
{
  return OHCI_REG->rhport_status_bit[0].current_connect_status;
}

tusb_speed_t hcd_port_speed_get(uint8_t hostid)
{
  return OHCI_REG->rhport_status_bit[0].low_speed_device_attached ? TUSB_SPEED_LOW : TUSB_SPEED_FULL;
}

// TODO refractor abtract later
void hcd_port_unplug(uint8_t hostid)
{
  // TODO OHCI
}

//--------------------------------------------------------------------+
// Controller API
//--------------------------------------------------------------------+

//--------------------------------------------------------------------+
// CONTROL PIPE API
//--------------------------------------------------------------------+
static void ed_init(ohci_ed_t *p_ed, uint8_t dev_addr, uint16_t max_packet_size, uint8_t endpoint_addr, uint8_t xfer_type, uint8_t interval)
{
  // address 0 is used as async head, which always on the list --> cannot be cleared
  if (dev_addr != 0)
  {
    memclr_(p_ed, sizeof(ohci_ed_t));
  }

  p_ed->device_address   = dev_addr;
  p_ed->endpoint_number  = endpoint_addr & 0x0F;
  p_ed->direction        = (xfer_type == TUSB_XFER_CONTROL) ? OHCI_PID_SETUP : ( (endpoint_addr & TUSB_DIR_DEV_TO_HOST_MASK) ? OHCI_PID_IN : OHCI_PID_OUT );
  p_ed->speed            = usbh_devices[dev_addr].speed;
  p_ed->is_iso           = (xfer_type == TUSB_XFER_ISOCHRONOUS) ? 1 : 0;
  p_ed->max_package_size = max_packet_size;

  p_ed->used             = 1;
}

static void gtd_init(ohci_gtd_t* p_td, void* data_ptr, uint16_t total_bytes)
{
  memclr_(p_td, sizeof(ohci_gtd_t));

  p_td->used                   = 1;
  p_td->expected_bytes         = total_bytes;

  p_td->buffer_rounding        = 1; // less than queued length is not a error
  p_td->delay_interrupt        = OHCI_INT_ON_COMPLETE_NO;
  p_td->condition_code         = OHCI_CCODE_NOT_ACCESSED;

  p_td->current_buffer_pointer = data_ptr;
  p_td->buffer_end             = total_bytes ? (((uint8_t*) data_ptr) + total_bytes-1) : NULL;
}

tusb_error_t  hcd_pipe_control_open(uint8_t dev_addr, uint8_t max_packet_size)
{
  ohci_ed_t* const p_ed = &ohci_data.control[dev_addr].ed;

  ed_init(p_ed, dev_addr, max_packet_size, 0, TUSB_XFER_CONTROL, 0); // TODO binterval of control is ignored

  if ( dev_addr != 0 )
  { // insert to control head
    ed_list_insert( &ohci_data.control[0].ed, p_ed);
  }else
  {
    p_ed->skip = 0; // addr0 is used as static control head --> only need to clear skip bit
  }

  return TUSB_ERROR_NONE;
}

tusb_error_t  hcd_pipe_control_xfer(uint8_t dev_addr, tusb_control_request_t const * p_request, uint8_t data[])
{
  ohci_ed_t* const p_ed = &ohci_data.control[dev_addr].ed;

  ohci_gtd_t *p_setup      = &ohci_data.control[dev_addr].gtd[0];
  ohci_gtd_t *p_data       = p_setup + 1;
  ohci_gtd_t *p_status     = p_setup + 2;

  //------------- SETUP Phase -------------//
  gtd_init(p_setup, p_request, 8);
  p_setup->index       = dev_addr;
  p_setup->pid         = OHCI_PID_SETUP;
  p_setup->next_td     = (uint32_t) p_data;
  p_setup->data_toggle = BIN8(10); // DATA0

  //------------- DATA Phase -------------//
  if (p_request->wLength > 0)
  {
    gtd_init(p_data, data, p_request->wLength);
    p_data->index       = dev_addr;
    p_data->pid         = p_request->bmRequestType_bit.direction ? OHCI_PID_IN : OHCI_PID_OUT;
    p_data->data_toggle = BIN8(11); // DATA1
  }else
  {
    p_data = p_setup;
  }
  p_data->next_td = (uint32_t) p_status;

  //------------- STATUS Phase -------------//
  gtd_init(p_status, NULL, 0); // zero-length data
  p_status->index           = dev_addr;
  p_status->pid             = p_request->bmRequestType_bit.direction ? OHCI_PID_OUT : OHCI_PID_IN; // reverse direction of data phase
  p_status->data_toggle     = BIN8(11); // DATA1
  p_status->delay_interrupt = OHCI_INT_ON_COMPLETE_YES;

  //------------- Attach TDs list to Control Endpoint -------------//
  p_ed->td_head = (uint32_t) p_setup;
  p_ed->td_tail = 0;

  OHCI_REG->command_status_bit.control_list_filled = 1;

  return TUSB_ERROR_NONE;
}

tusb_error_t  hcd_pipe_control_close(uint8_t dev_addr)
{
  // TODO OHCI return TUSB_ERROR_NONE;
}

//--------------------------------------------------------------------+
// BULK/INT/ISO PIPE API
//--------------------------------------------------------------------+
static ohci_ed_t * ed_find_free(uint8_t dev_addr)
{
  for(uint8_t i = 0; i < OHCI_MAX_QHD; i++)
  {
    if ( !ohci_data.device[dev_addr-1].ed[i].used )
    {
      return &ohci_data.device[dev_addr-1].ed[i];
    }
  }

  return NULL;
}

static void ed_list_insert(ohci_ed_t * p_pre, ohci_ed_t * p_ed)
{
  p_ed->next_ed = p_pre->next_ed;
  p_pre->next_ed = (uint32_t) p_ed;
}

pipe_handle_t hcd_pipe_open(uint8_t dev_addr, tusb_descriptor_endpoint_t const * p_endpoint_desc, uint8_t class_code)
{
  pipe_handle_t const null_handle = { .dev_addr = 0, .xfer_type = 0, .index = 0 };

  // TODO iso support
  ASSERT(p_endpoint_desc->bmAttributes.xfer != TUSB_XFER_ISOCHRONOUS, null_handle );

  //------------- Prepare Queue Head -------------//
  ohci_ed_t * const p_ed = ed_find_free(dev_addr);
  ASSERT_PTR(p_ed, null_handle);

  ed_init( p_ed, dev_addr, p_endpoint_desc->wMaxPacketSize.size, p_endpoint_desc->bEndpointAddress,
            p_endpoint_desc->bmAttributes.xfer, p_endpoint_desc->bInterval );
  p_ed->class_code = class_code;

  switch(p_endpoint_desc->bmAttributes.xfer)
  {
    case TUSB_XFER_BULK:
      ed_list_insert( &ohci_data.bulk_head_ed, p_ed );
    break;

    default: return null_handle; break;
  }

  return (pipe_handle_t)
  {
    .dev_addr  = dev_addr,
    .xfer_type = p_endpoint_desc->bmAttributes.xfer,
    .index     = p_ed - ohci_data.device[dev_addr-1].ed // TODO may refractor
  };
}

static ohci_gtd_t * gtd_find_free(uint8_t dev_addr)
{
  for(uint8_t i=0; i < OHCI_MAX_QTD; i++)
  {
    if (!ohci_data.device[dev_addr-1].gtd[i].used)
    {
      return &ohci_data.device[dev_addr-1].gtd[i];
    }
  }

  return NULL;
}

static void td_insert_to_ed(ohci_ed_t* p_ed, ohci_gtd_t * p_gtd)
{
  // tail is always NULL
  if ( align16(p_ed->td_head) == 0 )
  { // TD queue is empty --> head = TD
    p_ed->td_head |= (uint32_t) p_gtd;
  }
  else
  { // TODO currently only support queue up to 2 TD each endpoint at a time
    ((ohci_gtd_t*) align16(p_ed->td_head))->next_td = (uint32_t) p_gtd;
  }
}


static tusb_error_t  pipe_queue_xfer(pipe_handle_t pipe_hdl, uint8_t buffer[], uint16_t total_bytes, bool int_on_complete)
{
  ohci_ed_t* const p_ed = &ohci_data.device[pipe_hdl.dev_addr-1].ed[pipe_hdl.index];

  if ( !p_ed->is_iso )
  {
    ohci_gtd_t * const p_gtd = gtd_find_free(pipe_hdl.dev_addr);
    ASSERT_PTR(p_gtd, TUSB_ERROR_EHCI_NOT_ENOUGH_QTD); // TODO refractor error code

    gtd_init(p_gtd, buffer, total_bytes);
    p_gtd->index           = pipe_hdl.index;
    if ( int_on_complete )  p_gtd->delay_interrupt = OHCI_INT_ON_COMPLETE_YES;

    td_insert_to_ed(p_ed, p_gtd);
  }else
  {
    ASSERT_STATUS(TUSB_ERROR_NOT_SUPPORTED_YET);
  }

  return TUSB_ERROR_NONE;
}

tusb_error_t  hcd_pipe_queue_xfer(pipe_handle_t pipe_hdl, uint8_t buffer[], uint16_t total_bytes)
{
  return pipe_queue_xfer(pipe_hdl, buffer, total_bytes, false);
}

tusb_error_t  hcd_pipe_xfer(pipe_handle_t pipe_hdl, uint8_t buffer[], uint16_t total_bytes, bool int_on_complete)
{
  ASSERT_STATUS( pipe_queue_xfer(pipe_hdl, buffer, total_bytes, true) );

  OHCI_REG->command_status_bit.bulk_list_filled = 1;

  return TUSB_ERROR_NONE;
}

/// pipe_close should only be called as a part of unmount/safe-remove process
tusb_error_t  hcd_pipe_close(pipe_handle_t pipe_hdl)
{
  // TODO OHCI return TUSB_ERROR_NONE;
}

bool hcd_pipe_is_busy(pipe_handle_t pipe_hdl)
{
  // TODO OHCI
}

bool hcd_pipe_is_error(pipe_handle_t pipe_hdl)
{
  // TODO OHCI
}

bool hcd_pipe_is_stalled(pipe_handle_t pipe_hdl)
{
  // TODO OHCI
}

uint8_t hcd_pipe_get_endpoint_addr(pipe_handle_t pipe_hdl)
{
  // TODO OHCI
}

tusb_error_t hcd_pipe_clear_stall(pipe_handle_t pipe_hdl)
{
  // TODO OHCI return TUSB_ERROR_NONE;
}


//--------------------------------------------------------------------+
// OHCI Interrupt Handler
//--------------------------------------------------------------------+
static ohci_td_item_t* list_reverse(ohci_td_item_t* td_head)
{
  ohci_td_item_t* td_reverse_head = NULL;

  while(td_head != NULL)
  {
    uint32_t next = td_head->next_td;

    // make current's item become reverse's first item
    td_head->next_td = (uint32_t) td_reverse_head;
    td_reverse_head  = td_head;

    td_head = (ohci_td_item_t*) next; // advance to next item
  }

  return td_reverse_head;
}

static inline bool gtd_is_control(ohci_gtd_t const * const p_qtd) ATTR_CONST ATTR_ALWAYS_INLINE;
static inline bool gtd_is_control(ohci_gtd_t const * const p_qtd)
{
  return ((uint32_t) p_qtd) < ((uint32_t) ohci_data.device); // check ohci_data_t for memory layout
}

static inline ohci_ed_t* gtd_get_ed(ohci_gtd_t const * const p_qtd) ATTR_PURE ATTR_ALWAYS_INLINE;
static inline ohci_ed_t* gtd_get_ed(ohci_gtd_t const * const p_qtd)
{
  return gtd_is_control(p_qtd) ? &ohci_data.control[p_qtd->index].ed : NULL;
}

static inline uint32_t gtd_xfer_byte_left(uint32_t buffer_end, uint32_t current_buffer) ATTR_CONST ATTR_ALWAYS_INLINE;
static inline uint32_t gtd_xfer_byte_left(uint32_t buffer_end, uint32_t current_buffer)
{ // 5.2.9 OHCI sample code
  return (align4k(buffer_end ^ current_buffer) ? 0x1000 : 0) +
      offset4k(buffer_end) - offset4k(current_buffer) + 1;
}

static void done_queue_isr(hostid)
{
  uint8_t max_loop = (TUSB_CFG_HOST_DEVICE_MAX+1)*OHCI_MAX_QTD;

  // done head is written in reversed order of completion --> need to reverse the done queue first
  ohci_td_item_t* td_head = list_reverse ( (ohci_td_item_t*) align16(ohci_data.hcca.done_head) );

  while( td_head != NULL && max_loop > 0)
  {
    // TODO check if td_head is iso td
    //------------- Non ISO transfer -------------//
    ohci_gtd_t * const p_qtd = (ohci_gtd_t * const) td_head;

    p_qtd->used = 0; // free TD
    if ( p_qtd->delay_interrupt == OHCI_INT_ON_COMPLETE_YES)
    {
      ohci_ed_t * const p_ed  = gtd_get_ed(p_qtd);

      uint32_t const xferred_bytes = p_qtd->expected_bytes - gtd_xfer_byte_left((uint32_t) p_qtd->buffer_end, (uint32_t) p_qtd->current_buffer_pointer);
      tusb_event_t const event = (p_qtd->condition_code == OHCI_CCODE_NO_ERROR) ? TUSB_EVENT_XFER_COMPLETE :
                                 (p_qtd->condition_code == OHCI_CCODE_STALL) ? TUSB_EVENT_XFER_STALLED : TUSB_EVENT_XFER_ERROR;

      pipe_handle_t pipe_hdl =
      {
          .dev_addr  = p_ed->device_address,
          .xfer_type = TUSB_XFER_CONTROL, // TODO other type
          .index     = 0 // TODO other type
      };

      usbh_xfer_isr(pipe_hdl, 0, // TODO class code
                    event, xferred_bytes);
    }

    td_head = (ohci_td_item_t*) td_head->next_td;
    max_loop--;
  }
}

void hcd_isr(uint8_t hostid)
{
  uint32_t int_status = OHCI_REG->interrupt_status & OHCI_REG->interrupt_enable;

  if (int_status == 0) return;

  //------------- RootHub status -------------//
  if ( int_status & OHCI_INT_RHPORT_STATUS_CHANGE_MASK )
  {
    uint32_t const rhport_status = OHCI_REG->rhport_status[0] & OHCI_RHPORT_ALL_CHANGE_MASK;

    // TODO dual port is not yet supported
    if ( rhport_status & OHCI_RHPORT_CONNECT_STATUS_CHANGE_MASK )
    {
      if ( OHCI_REG->rhport_status_bit[0].current_connect_status )
      {
        usbh_hcd_rhport_plugged_isr(0);
      }else
      {
        usbh_hcd_rhport_unplugged_isr(0);
      }
    }

    if ( rhport_status & OHCI_RHPORT_PORT_SUSPEND_CHANGE_MASK)
    {

    }

    OHCI_REG->rhport_status[0] = rhport_status; // acknowledge all interrupt
  }

  //------------- Transfer Complete -------------//
  if ( int_status & OHCI_INT_WRITEBACK_DONEHEAD_MASK)
  {
    done_queue_isr(hostid);
  }

  OHCI_REG->interrupt_status = int_status; // Acknowledge handled interrupt
}
//--------------------------------------------------------------------+
// HELPER
//--------------------------------------------------------------------+


#endif