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/*

  FreeRTOS.org V4.2.1 - Copyright (C) 2003-2007 Richard Barry.

  This file is part of the FreeRTOS.org distribution.

  FreeRTOS.org 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 2 of the License, or

  (at your option) any later version.

  FreeRTOS.org 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 FreeRTOS.org; if not, write to the Free Software

  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  A special exception to the GPL can be applied should you wish to distribute

  a combined work that includes FreeRTOS.org, without being obliged to provide

  the source code for any proprietary components.  See the licensing section 

  of http://www.FreeRTOS.org for full details of how and when the exception

  can be applied.

  ***************************************************************************

  See http://www.FreeRTOS.org for documentation, latest information, license 

  and contact details.  Please ensure to read the configuration and relevant 

  port sections of the online documentation.

  ***************************************************************************

*/

/* 

  BASIC INTERRUPT DRIVEN DRIVER FOR USB. 

  This file contains all the usb components that must be compiled

  to ARM mode.  The components that can be compiled to either ARM or THUMB

  mode are contained in USB-CDC.c.

*/

/* Scheduler includes. */

#include <FreeRTOS.h>

#include <task.h>

#include <queue.h>

/* Demo application includes. */

#include <board.h>

#include <usb.h>

#include <USB-CDC.h>

#define usbINT_CLEAR_MASK	(AT91C_UDP_TXCOMP | AT91C_UDP_STALLSENT | AT91C_UDP_RXSETUP | AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1 )

/*-----------------------------------------------------------*/

/* Messages and queue used to communicate between the ISR and the USB task. */

static xISRStatus xISRMessages[usbQUEUE_LENGTH + 1];

extern xQueueHandle xUSBInterruptQueue;

/*-----------------------------------------------------------*/

/* The ISR can cause a context switch so is declared naked. */

void vUSB_ISR (void) __attribute__ ((naked));

/*-----------------------------------------------------------*/

void

vUSB_ISR (void)

{

  /* This ISR can cause a context switch.  Therefore a call to the 

     portENTER_SWITCHING_ISR() macro is made.  This must come BEFORE any 

     stack variable declarations. */

  portENTER_SWITCHING_ISR ();

  /* Now variables can be declared. */

  portCHAR cTaskWokenByPost = pdFALSE;

  static volatile unsigned portLONG ulNextMessage = 0;

  xISRStatus *pxMessage;

  unsigned portLONG ulRxBytes;

  unsigned portCHAR ucFifoIndex;

  /* Use the next message from the array. */

  pxMessage = &(xISRMessages[(ulNextMessage & usbQUEUE_LENGTH)]);

  ulNextMessage++;

  /* Save UDP ISR state for task-level processing. */

  pxMessage->ulISR = AT91C_BASE_UDP->UDP_ISR;

  pxMessage->ulCSR0 = AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_0];

  /* Clear interrupts from ICR. */

  AT91C_BASE_UDP->UDP_ICR = AT91C_BASE_UDP->UDP_IMR | AT91C_UDP_ENDBUSRES;

  /* Process incoming FIFO data.  Must set DIR (if needed) and clear RXSETUP 

     before exit. */

  /* Read CSR and get incoming byte count. */

  ulRxBytes = (pxMessage->ulCSR0 >> 16) & usbRX_COUNT_MASK;

  /* Receive control transfers on endpoint 0. */

  if (pxMessage->ulCSR0 & (AT91C_UDP_RXSETUP | AT91C_UDP_RX_DATA_BK0))

    {

      /* Save FIFO data buffer for either a SETUP or DATA stage */

      for (ucFifoIndex = 0; ucFifoIndex < ulRxBytes; ucFifoIndex++)

	{

	  pxMessage->ucFifoData[ucFifoIndex] =

	    AT91C_BASE_UDP->UDP_FDR[usbEND_POINT_0];

	}

      /* Set direction for data stage.  Must be done before RXSETUP is 

         cleared. */

      if ((AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_0] & AT91C_UDP_RXSETUP))

	{

	  if (ulRxBytes

	      && (pxMessage->ucFifoData[usbREQUEST_TYPE_INDEX] & 0x80))

	    {

	      AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_0] |= AT91C_UDP_DIR;

	      /* Might not be wise in an ISR! */

	      while (!

		     (AT91C_BASE_UDP->

		      UDP_CSR[usbEND_POINT_0] & AT91C_UDP_DIR));

	    }

	  /* Clear RXSETUP */

	  AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_0] &= ~AT91C_UDP_RXSETUP;

	  /* Might not be wise in an ISR! */

	  while (AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_0] & AT91C_UDP_RXSETUP);

	}

      else

	{

	  /* Clear RX_DATA_BK0 */

	  AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_0] &= ~AT91C_UDP_RX_DATA_BK0;

	  /* Might not be wise in an ISR! */

	  while (AT91C_BASE_UDP->

		 UDP_CSR[usbEND_POINT_0] & AT91C_UDP_RX_DATA_BK0);

	}

    }

  /* If we received data on endpoint 1, disable its interrupts until it is 

     processed in the main loop */

  if (AT91C_BASE_UDP->

      UDP_CSR[usbEND_POINT_1] & (AT91C_UDP_RX_DATA_BK0 |

				 AT91C_UDP_RX_DATA_BK1))

    {

      AT91C_BASE_UDP->UDP_IDR = AT91C_UDP_EPINT1;

    }

  AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_0] &=

    ~(AT91C_UDP_TXCOMP | AT91C_UDP_STALLSENT);

  /* Clear interrupts for the other endpoints, retain data flags for endpoint 

     1. */

  AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_1] &=

    ~(AT91C_UDP_TXCOMP | AT91C_UDP_STALLSENT | AT91C_UDP_RXSETUP);

  AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_2] &= ~usbINT_CLEAR_MASK;

  AT91C_BASE_UDP->UDP_CSR[usbEND_POINT_3] &= ~usbINT_CLEAR_MASK;

  /* Post ISR data to queue for task-level processing */

  cTaskWokenByPost =

    xQueueSendFromISR (xUSBInterruptQueue, &pxMessage, cTaskWokenByPost);

  /* Clear AIC to complete ISR processing */

  AT91C_BASE_AIC->AIC_EOICR = 0;

  /* Do a task switch if needed */

portEXIT_SWITCHING_ISR (cTaskWokenByPost)}