/* $Id: xgpio_extra.c,v 1.1.2.1 2009/11/25 07:38:16 svemula Exp $ */
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/**
* @file xgpio_extra.c
*
* The implementation of the XGpio driver's advanced discrete functions.
* See xgpio.h for more information about the driver.
*
* @note
*
* None
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a rmm  02/04/02 First release
* 2.00a jhl  12/16/02 Update for dual channel and interrupt support
* 2.11a mta  03/21/07 Updated to new coding style
* 3.00a sv   11/21/09 Updated to use HAL Processor APIs. Renamed the macros
*		      XGpio_mWriteReg to XGpio_WriteReg, and XGpio_mReadReg
*		      to XGpio_ReadReg.
* </pre>
*
*****************************************************************************/

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

#include "xgpio.h"
#include "xgpio_i.h"

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

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

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

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

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


/****************************************************************************/
/**
* Set output discrete(s) to logic 1 for the specified GPIO channel.
*
* @param	InstancePtr is a pointer to an XGpio instance to be worked on.
* @param	Channel contains the channel of the GPIO (1 or 2) to operate on.
* @param	Mask is the set of bits that will be set to 1 in the discrete
*		data register. All other bits in the data register are
*		unaffected.
*
* @return	None.
*
* @note
*
* The hardware must be built for dual channels if this function is used
* with any channel other than 1.  If it is not, this function will assert.
*
*****************************************************************************/
void XGpio_DiscreteSet(XGpio * InstancePtr, unsigned Channel, u32 Mask)
{
	u32 Current;
	unsigned DataOffset;

	Xil_AssertVoid(InstancePtr != NULL);
	Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
	Xil_AssertVoid((Channel == 1) ||
		     ((Channel == 2) && (InstancePtr->IsDual == TRUE)));

	/*
	 * Calculate the offset to the data register of the GPIO once
	 */
	DataOffset = ((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_DATA_OFFSET;

	/*
	 * Read the contents of the data register, merge in Mask and write
	 * back results
	 */
	Current = XGpio_ReadReg(InstancePtr->BaseAddress, DataOffset);
	Current |= Mask;
	XGpio_WriteReg(InstancePtr->BaseAddress, DataOffset, Current);
}


/****************************************************************************/
/**
* Set output discrete(s) to logic 0 for the specified GPIO channel.
*
* @param	InstancePtr is a pointer to an XGpio instance to be worked on.
* @param	Channel contains the channel of the GPIO (1 or 2) to operate on.
* @param	Mask is the set of bits that will be set to 0 in the discrete
*		data register. All other bits in the data register are
*		unaffected.
*
* @return	None.
*
* @note
*
* The hardware must be built for dual channels if this function is used
* with any channel other than 1.  If it is not, this function will assert.
*
*****************************************************************************/
void XGpio_DiscreteClear(XGpio * InstancePtr, unsigned Channel, u32 Mask)
{
	u32 Current;
	unsigned DataOffset;

	Xil_AssertVoid(InstancePtr != NULL);
	Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
	Xil_AssertVoid((Channel == 1) ||
		     ((Channel == 2) && (InstancePtr->IsDual == TRUE)));

	/*
	 * Calculate the offset to the data register of the GPIO once
	 */
	DataOffset = ((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_DATA_OFFSET;

	/*
	 * Read the contents of the data register, merge in Mask and write
	 * back results
	 */
	Current = XGpio_ReadReg(InstancePtr->BaseAddress, DataOffset);
	Current &= ~Mask;
	XGpio_WriteReg(InstancePtr->BaseAddress, DataOffset, Current);
}