/*
    FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.

    ***************************************************************************
    >>!   NOTE: The modification to the GPL is included to allow you to     !<<
    >>!   distribute a combined work that includes FreeRTOS without being   !<<
    >>!   obliged to provide the source code for proprietary components     !<<
    >>!   outside of the FreeRTOS kernel.                                   !<<
    ***************************************************************************

    FreeRTOS 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.  Full license text is available on the following
    link: http://www.freertos.org/a00114.html

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS provides completely free yet professionally developed,    *
     *    robust, strictly quality controlled, supported, and cross          *
     *    platform software that is more than just the market leader, it     *
     *    is the industry's de facto standard.                               *
     *                                                                       *
     *    Help yourself get started quickly while simultaneously helping     *
     *    to support the FreeRTOS project by purchasing a FreeRTOS           *
     *    tutorial book, reference manual, or both:                          *
     *    http://www.FreeRTOS.org/Documentation                              *
     *                                                                       *
    ***************************************************************************

    http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
    the FAQ page "My application does not run, what could be wrong?".  Have you
    defined configASSERT()?

    http://www.FreeRTOS.org/support - In return for receiving this top quality
    embedded software for free we request you assist our global community by
    participating in the support forum.

    http://www.FreeRTOS.org/training - Investing in training allows your team to
    be as productive as possible as early as possible.  Now you can receive
    FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
    Ltd, and the world's leading authority on the world's leading RTOS.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
    compatible FAT file system, and our tiny thread aware UDP/IP stack.

    http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
    Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.

    http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
    Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS
    licenses offer ticketed support, indemnification and commercial middleware.

    http://www.SafeRTOS.com - High Integrity Systems also provide a safety
    engineered and independently SIL3 certified version for use in safety and
    mission critical applications that require provable dependability.

    1 tab == 4 spaces!
*/

#include "FreeRTOS.h"
#include "semphr.h"
#include "task.h"

/* Wrapper for the EMAC interrupt. */
void vEMACISR_Wrapper( void ) __attribute__((naked));

/* Handler called by the ISR wrapper.  This must be kept a separate
function to ensure the stack frame is correctly set up. */
void vEMACISR_Handler( void ) __attribute__((noinline));

static SemaphoreHandle_t xEMACSemaphore;

/*-----------------------------------------------------------*/

void vPassEMACSemaphore( SemaphoreHandle_t xSemaphore )
{
	xEMACSemaphore = xSemaphore;
}
/*-----------------------------------------------------------*/

void vEMACISR_Handler( void )
{
volatile unsigned long ulIntStatus, ulRxStatus;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

	ulIntStatus = AT91C_BASE_EMAC->EMAC_ISR;
	ulRxStatus = AT91C_BASE_EMAC->EMAC_RSR;

	if( ( ulIntStatus & AT91C_EMAC_RCOMP ) || ( ulRxStatus & AT91C_EMAC_REC ) )
	{
		/* A frame has been received, signal the uIP task so it can process
		the Rx descriptors. */
		xSemaphoreGiveFromISR( xEMACSemaphore, &xHigherPriorityTaskWoken );
		AT91C_BASE_EMAC->EMAC_RSR = AT91C_EMAC_REC;
	}

	/* Clear the interrupt. */
	AT91C_BASE_AIC->AIC_EOICR = 0;
	
    /* Switch to the uIP task. */
    if( xHigherPriorityTaskWoken )
    {
    	/* If a task of higher priority than the interrupted task was
    	unblocked by the ISR then this call will ensure that the 
    	unblocked task is the task the ISR returns to. */
    	portYIELD_FROM_ISR();
    }
}
/*-----------------------------------------------------------*/

void vEMACISR_Wrapper( void )
{
	/* Save the context of the interrupted task. */
	portSAVE_CONTEXT();
	
	/* Call the handler task to do the actual work.  This must be a separate
	function to ensure the stack frame is correctly set up. */
	__asm volatile ("bl vEMACISR_Handler");
	
	/* Restore the context of whichever task is the next to run. */
	portRESTORE_CONTEXT();
}