/* $Id: xintc_selftest.c,v 1.2 2005/01/04 17:48:57 moleres Exp $ */
/******************************************************************************
*
*       XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
*       AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
*       SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
*       OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
*       APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
*       THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
*       AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
*       FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY
*       WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
*       IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
*       REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
*       INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
*       FOR A PARTICULAR PURPOSE.
*
*       (c) Copyright 2002 Xilinx Inc.
*       All rights reserved.
*
******************************************************************************/
/*****************************************************************************/
/**
*
* @file xintc_selftest.c
*
* Contains diagnostic self-test functions for the XIntc component.  This file
* requires other files of the component to be linked in also.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- -----------------------------------------------
* 1.00b jhl  02/21/02 First release
* </pre>
*
******************************************************************************/

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

#include "xbasic_types.h"
#include "xintc.h"
#include "xintc_i.h"

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

#define XIN_TEST_MASK 1

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


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


/************************** Function Prototypes ******************************/


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


/*****************************************************************************/
/**
*
* Run a self-test on the driver/device. This is a destructive test.
*
* This involves forcing interrupts into the controller and verifying that they
* are recognized and can be acknowledged. This test will not succeed if the
* interrupt controller has been started in real mode such that interrupts
* cannot be forced.
*
* @param    InstancePtr is a pointer to the XIntc instance to be worked on.
*
* @return
*
* - XST_SUCCESS if self-test is successful.
* - XST_INTC_FAIL_SELFTEST if the Interrupt controller fails the self-test.
*   It will fail the self test if the device has previously been started in
*   real mode.
*
* @note
*
* None.
*
******************************************************************************/
XStatus XIntc_SelfTest(XIntc *InstancePtr)
{
    Xuint32 CurrentMIE;
    Xuint32 CurrentISR;
    Xuint32 Temp;
    /*
     * assert the arguments
     */
    XASSERT_NONVOID(InstancePtr != XNULL);
    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);


    CurrentMIE = XIntc_In32(InstancePtr->BaseAddress +
                          XIN_MER_OFFSET);

    /*
     * acknowledge all pending interrupts by reading the interrupt status
     * register and writing the value to the acknowledge register
     */
    Temp = XIntc_In32(InstancePtr->BaseAddress + XIN_ISR_OFFSET);

    XIntc_Out32(InstancePtr->BaseAddress + XIN_IAR_OFFSET, Temp);

    /*
     * verify that there are no interrupts by reading the interrupt status
     */
    CurrentISR = XIntc_In32(InstancePtr->BaseAddress + XIN_ISR_OFFSET);

    /*
     * ISR should be zero after all interrupts are acknowledged
     */
    if (CurrentISR != 0)
    {
        return XST_INTC_FAIL_SELFTEST;
    }

    /*
     * set a bit in the ISR which simulates an interrupt
     */
    XIntc_Out32(InstancePtr->BaseAddress + XIN_ISR_OFFSET, XIN_TEST_MASK);

    /*
     * verify that it was set
     */

    CurrentISR = XIntc_In32(InstancePtr->BaseAddress +
                          XIN_ISR_OFFSET);

    if (CurrentISR != XIN_TEST_MASK)
    {
        return XST_INTC_FAIL_SELFTEST;
    }

    /*
     * acknowledge the interrupt
     */
    XIntc_Out32(InstancePtr->BaseAddress + XIN_IAR_OFFSET, XIN_TEST_MASK);

    /*
     * read back the ISR to verify that the interrupt is gone
     */
    CurrentISR = XIntc_In32(InstancePtr->BaseAddress + XIN_ISR_OFFSET);

    if (CurrentISR != 0)
    {
        return XST_INTC_FAIL_SELFTEST;
    }

    return XST_SUCCESS;
}

/*****************************************************************************/
/**
*
* Allows software to simulate an interrupt in the interrupt controller.  This
* function will only be successful when the interrupt controller has been
* started in simulation mode.  Once it has been started in real mode,
* interrupts cannot be simulated. A simulated interrupt allows the interrupt
* controller to be tested without any device to drive an interrupt input
* signal into it.
*
* @param    InstancePtr is a pointer to the XIntc instance to be worked on.
* @param    Id is the interrupt ID for which to simulate an interrupt.
*
* @return
*
* XST_SUCCESS if successful, or XST_FAILURE if the interrupt could not be
* simulated because the interrupt controller is or has previously been in
* real mode.
*
* @note
*
* None.
*
******************************************************************************/
XStatus XIntc_SimulateIntr(XIntc *InstancePtr, Xuint8 Id)
{
    Xuint32 Mask;
    Xuint32 MasterEnable;

    /*
     * assert the arguments
     */
    XASSERT_NONVOID(InstancePtr != XNULL);
    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
    XASSERT_NONVOID(Id < XPAR_INTC_MAX_NUM_INTR_INPUTS);


    /* get the contents of the master enable register and determine if
     * hardware interrupts have already been enabled, if so, this is a write
     * once bit such that simulation can't be done at this point because
     * the ISR register is no longer writable by software
     */
    MasterEnable = XIntc_In32(InstancePtr->BaseAddress + XIN_MER_OFFSET);

    if (MasterEnable & XIN_INT_HARDWARE_ENABLE_MASK)
    {
        return XST_FAILURE;
    }

    /*
     * the Id is used to create the appropriate mask for the
     * desired bit position. Id currently limited to 0 - 31
     */
    Mask = XIntc_BitPosMask[Id];

    /*
     * enable the selected interrupt source by reading the interrupt enable
     * register and then modifying only the specified interrupt id enable
     */

    XIntc_Out32(InstancePtr->BaseAddress + XIN_ISR_OFFSET, Mask);

    /* indicate the interrupt was successfully simulated */

    return XST_SUCCESS;
}

