/* $Id: xscugic_example.c,v 1.1.2.2 2011/03/23 07:46:43 sadanan Exp $ */
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******************************************************************************/
/******************************************************************************/
/**
*
* @file xscugic_example.c
*
* This file contains a design example using the Interrupt Controller driver
* (XScuGic) and hardware device. Please reference other device driver examples
* to see more examples of how the intc and interrupts can be used by a software
* application.
*
* @note
*
* None
*
* <pre>
*
* MODIFICATION HISTORY:
* Ver   Who  Date     Changes
* ----- ---- -------- ----------------------------------------------------
* 1.00a drg  01/18/10 First release
* </pre>
******************************************************************************/

/***************************** Include Files *********************************/

#include <stdio.h>
#include <stdlib.h>
#include "xil_io.h"
#include "xil_exception.h"
#include "xparameters.h"
#include "xil_cache.h"
#include "xil_printf.h"
#include "xil_types.h"
#include "xscugic.h"

/************************** Constant Definitions *****************************/

/*
 * The following constants map to the XPAR parameters created in the
 * xparameters.h file. They are defined here such that a user can easily
 * change all the needed parameters in one place.
 */
#define INTC_DEVICE_ID		XPAR_SCUGIC_0_DEVICE_ID
#define INTC_DEVICE_INT_ID	0x0E

/**************************** Type Definitions *******************************/

/***************** Macros (Inline Functions) Definitions *********************/

/************************** Function Prototypes ******************************/
int ScuGicExample(u16 DeviceId);
int SetUpInterruptSystem(XScuGic *XScuGicInstancePtr);
void DeviceDriverHandler(void *CallbackRef);

/************************** Variable Definitions *****************************/

XScuGic InterruptController; 	     /* Instance of the Interrupt Controller */
static XScuGic_Config *GicConfig;    /* The configuration parameters of the
                                       controller */

/*
 * Create a shared variable to be used by the main thread of processing and
 * the interrupt processing
 */
volatile static int InterruptProcessed = FALSE;

static void AssertPrint(const char8 *FilenamePtr, s32 LineNumber){
	xil_printf("ASSERT: File Name: %s ", FilenamePtr);
	xil_printf("Line Number: %d\r\n",LineNumber);
}

/*****************************************************************************/
/**
*
* This is the main function for the Interrupt Controller example.
*
* @param	None.
*
* @return	XST_SUCCESS to indicate success, otherwise XST_FAILURE.
*
* @note		None.
*
****************************************************************************/
int main(void)
{
	int Status;


	/*
	 * Setup an assert call back to get some info if we assert.
	 */
	Xil_AssertSetCallback(AssertPrint);

	xil_printf("GIC Example Test\r\n");

	/*
	 *  Run the Gic example , specify the Device ID generated in xparameters.h
	 */
	Status = ScuGicExample(INTC_DEVICE_ID);
	if (Status != XST_SUCCESS) {
		xil_printf("GIC Example Test Failed\r\n");
		return XST_FAILURE;
	}

	xil_printf("Successfully ran GIC Example Test\r\n");
	return XST_SUCCESS;
}

/*****************************************************************************/
/**
*
* This function is an example of how to use the interrupt controller driver
* (XScuGic) and the hardware device.  This function is designed to
* work without any hardware devices to cause interrupts. It may not return
* if the interrupt controller is not properly connected to the processor in
* either software or hardware.
*
* This function relies on the fact that the interrupt controller hardware
* has come out of the reset state such that it will allow interrupts to be
* simulated by the software.
*
* @param	DeviceId is Device ID of the Interrupt Controller Device,
*		typically XPAR_<INTC_instance>_DEVICE_ID value from
*		xparameters.h
*
* @return	XST_SUCCESS to indicate success, otherwise XST_FAILURE
*
* @note		None.
*
******************************************************************************/
int ScuGicExample(u16 DeviceId)
{
	int Status;

	/*
	 * Initialize the interrupt controller driver so that it is ready to
	 * use.
	 */
	GicConfig = XScuGic_LookupConfig(DeviceId);
	if (NULL == GicConfig) {
		return XST_FAILURE;
	}

	Status = XScuGic_CfgInitialize(&InterruptController, GicConfig,
					GicConfig->CpuBaseAddress);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}


	/*
	 * Perform a self-test to ensure that the hardware was built
	 * correctly
	 */
	Status = XScuGic_SelfTest(&InterruptController);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}


	/*
	 * Setup the Interrupt System
	 */
	Status = SetUpInterruptSystem(&InterruptController);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Connect a device driver handler that will be called when an
	 * interrupt for the device occurs, the device driver handler performs
	 * the specific interrupt processing for the device
	 */
	Status = XScuGic_Connect(&InterruptController, INTC_DEVICE_INT_ID,
			   (Xil_ExceptionHandler)DeviceDriverHandler,
			   (void *)&InterruptController);

	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Enable the interrupt for the device and then cause (simulate) an
	 * interrupt so the handlers will be called
	 */
	XScuGic_Enable(&InterruptController, INTC_DEVICE_INT_ID);

	/*
	 *  Simulate the Interrupt
	 */
	Status = XScuGic_SoftwareIntr(&InterruptController,
					INTC_DEVICE_INT_ID,
					XSCUGIC_SPI_CPU0_MASK);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}

	/*
	 * Wait for the interrupt to be processed, if the interrupt does not
	 * occur this loop will wait forever
	 */
	while (1) {
		/*
		 * If the interrupt occurred which is indicated by the global
		 * variable which is set in the device driver handler, then
		 * stop waiting
		 */
		if (InterruptProcessed) {
			break;
		}
	}

	return XST_SUCCESS;
}

/******************************************************************************/
/**
*
* This function connects the interrupt handler of the interrupt controller to
* the processor.  This function is seperate to allow it to be customized for
* each application.  Each processor or RTOS may require unique processing to
* connect the interrupt handler.
*
* @param	XScuGicInstancePtr is the instance of the interrupt controller
*		that needs to be worked on.
*
* @return	None.
*
* @note		None.
*
****************************************************************************/
int SetUpInterruptSystem(XScuGic *XScuGicInstancePtr)
{

	/*
	 * Connect the interrupt controller interrupt handler to the hardware
	 * interrupt handling logic in the ARM processor.
	 */
	Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
			(Xil_ExceptionHandler) XScuGic_InterruptHandler,
			XScuGicInstancePtr);

	/*
	 * Enable interrupts in the ARM
	 */
	Xil_ExceptionEnable();

	return XST_SUCCESS;
}

/******************************************************************************/
/**
*
* This function is designed to look like an interrupt handler in a device
* driver. This is typically a 2nd level handler that is called from the
* interrupt controller interrupt handler.  This handler would typically
* perform device specific processing such as reading and writing the registers
* of the device to clear the interrupt condition and pass any data to an
* application using the device driver.  Many drivers already provide this
* handler and the user is not required to create it.
*
* @param	CallbackRef is passed back to the device driver's interrupt
*		handler by the XScuGic driver.  It was given to the XScuGic
*		driver in the XScuGic_Connect() function call.  It is typically
*		a pointer to the device driver instance variable.
*		In this example, we do not care about the callback
*		reference, so we passed it a 0 when connecting the handler to
*		the XScuGic driver and we make no use of it here.
*
* @return	None.
*
* @note		None.
*
****************************************************************************/
void DeviceDriverHandler(void *CallbackRef)
{
	/*
	 * Indicate the interrupt has been processed using a shared variable
	 */
	InterruptProcessed = TRUE;
}