/* $Id: xgpio.c,v 1.2 2006/02/17 21:33:42 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 - 2005 Xilinx Inc.*       All rights reserved.*******************************************************************************//*** @file xgpio.c** The implementation of the XGpio component's basic functionality. See xgpio.h* for more information about the component.** @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* 2.01a jvb  12/13/05 I changed Initialize() into CfgInitialize(), and made*                     CfgInitialize() take a pointer to a config structure*                     instead of a device id. I moved Initialize() into*                     xgpio_sinit.c, and had Initialize() call CfgInitialize()*                     after it retrieved the config structure using the device*                     id. I removed include of xparameters.h along with any*                     dependencies on xparameters.h and the _g.c config table.** </pre>******************************************************************************//***************************** Include Files ********************************/#include "xgpio.h"#include "xstatus.h"/************************** Constant Definitions ****************************//**************************** Type Definitions ******************************//***************** Macros (Inline Functions) Definitions ********************//************************** Variable Definitions ****************************//************************** Function Prototypes *****************************//****************************************************************************//*** Initialize the XGpio instance provided by the caller based on the* given configuration data.** Nothing is done except to initialize the InstancePtr.** @param InstancePtr is a pointer to an XGpio instance. The memory the pointer*        references must be pre-allocated by the caller. Further calls to*        manipulate the component through the XGpio API must be made with this*        pointer.** @param Config is a reference to a structure containing information about*        a specific GPIO device. This function initializes an InstancePtr object*        for a specific device specified by the contents of Config. This*        function can initialize multiple instance objects with the use of*        multiple calls giving different Config information on each call.** @param EffectiveAddr is the device base address in the virtual memory address*        space. The caller is responsible for keeping the address mapping*        from EffectiveAddr to the device physical base address unchanged*        once this function is invoked. Unexpected errors may occur if the*        address mapping changes after this function is called. If address*        translation is not used, use Config->BaseAddress for this parameters,*        passing the physical address instead.** @return** - XST_SUCCESS           Initialization was successfull.** @note** None.******************************************************************************/XStatus XGpio_CfgInitialize(XGpio *InstancePtr, XGpio_Config *Config,                            Xuint32 EffectiveAddr){    /*     * Assert arguments     */    XASSERT_NONVOID(InstancePtr != XNULL);    /*     * Set some default values.     */    InstancePtr->BaseAddress = EffectiveAddr;    InstancePtr->InterruptPresent = Config->InterruptPresent;    InstancePtr->IsDual = Config->IsDual;    /*     * Indicate the instance is now ready to use, initialized without error     */    InstancePtr->IsReady = XCOMPONENT_IS_READY;    return(XST_SUCCESS);}/****************************************************************************//*** Set the input/output direction of all discrete signals 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 DirectionMask is a bitmask specifying which discretes are input and*        which are output. Bits set to 0 are output and bits set to 1 are input.** @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_SetDataDirection(XGpio *InstancePtr, unsigned Channel,                            Xuint32 DirectionMask){    XASSERT_VOID(InstancePtr != XNULL);    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);    XASSERT_VOID((Channel == 1)  ||                 ((Channel == 2) &&                  (InstancePtr->IsDual == XTRUE)));    XGpio_mWriteReg(InstancePtr->BaseAddress,                    ((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_TRI_OFFSET,                    DirectionMask);}/****************************************************************************//*** Read state of discretes for the specified GPIO channnel.** @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.** @return Current copy of the discretes register.** @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.******************************************************************************/Xuint32 XGpio_DiscreteRead(XGpio *InstancePtr, unsigned Channel){    XASSERT_NONVOID(InstancePtr != XNULL);    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);    XASSERT_NONVOID((Channel == 1)  ||                    ((Channel == 2) &&                     (InstancePtr->IsDual == XTRUE)));    return XGpio_mReadReg(InstancePtr->BaseAddress,                          ((Channel - 1) * XGPIO_CHAN_OFFSET) +                          XGPIO_DATA_OFFSET);}/****************************************************************************//*** Write to discretes register 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 Data is the value to be written to the discretes register.** @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.* See also XGpio_DiscreteSet() and XGpio_DiscreteClear().******************************************************************************/void XGpio_DiscreteWrite(XGpio *InstancePtr, unsigned Channel, Xuint32 Data){    XASSERT_VOID(InstancePtr != XNULL);    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);    XASSERT_VOID((Channel == 1)  ||                 ((Channel == 2) &&                  (InstancePtr->IsDual == XTRUE)));    XGpio_mWriteReg(InstancePtr->BaseAddress,                    ((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_DATA_OFFSET,                    Data);}