/* $Id: xspi.h,v 1.1.2.2 2011/08/10 10:58:25 sadanan Exp $ */
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/*****************************************************************************/
/**
*
* @file xspi.h
*
* This component contains the implementation of the XSpi component. It is the
* driver for an SPI master or slave device. It supports 8-bit, 16-bit and 32-bit
* wide data transfers.
*
* SPI is a 4-wire serial interface. It is a full-duplex, synchronous bus that
* facilitates communication between one master and one slave. The device is
* always full-duplex, which means that for every byte sent, one is received, and
* vice-versa. The master controls the clock, so it can regulate when it wants
* to send or receive data. The slave is under control of the master, it must
* respond quickly since it has no control of the clock and must send/receive
* data as fast or as slow as the master does.
*
* The application software between master and slave must implement a higher
* layer protocol so that slaves know what to transmit to the master and when.
*
* <b>Initialization & Configuration</b>
*
* The XSpi_Config structure is used by the driver to configure itself. This
* configuration structure is typically created by the tool-chain based on HW
* build properties.
*
* To support multiple runtime loading and initialization strategies employed
* by various operating systems, the driver instance can be initialized in one
* of the following ways:
*
*   - XSpi_Initialize(InstancePtr, DeviceId) - The driver looks up its own
*     configuration structure created by the tool-chain based on an ID provided
*     by the tool-chain.
*
*   - XSpi_CfgInitialize(InstancePtr, CfgPtr, EffectiveAddr) - Uses a
*     configuration structure provided by the caller. If running in a system
*     with address translation, the provided virtual memory base address
*     replaces the physical address present in the configuration structure.
*
* <b>Multiple Masters</b>
*
* More than one master can exist, but arbitration is the responsibility of the
* higher layer software. The device driver does not perform any type of
* arbitration.
*
* <b>Multiple Slaves</b>
*
* Multiple slaves are supported by adding additional slave select (SS) signals
* to each device, one for each slave on the bus. The driver ensures that only
* one slave can be selected at any one time.
*
* <b>FIFOs</b>
*
* The SPI hardware is parameterized such that it can be built with or without
* FIFOs. When using FIFOs, both send and receive must have FIFOs. The driver
* will not function correctly if one direction has a FIFO but the other
* direction does not. The frequency of the interrupts which occur is
* proportional to the data rate such that high data rates without the FIFOs
* could cause the software to consume large amounts of processing time. The
* driver is designed to work with or without the FIFOs.
*
* <b>Interrupts</b>
*
* The user must connect the interrupt handler of the driver,
* XSpi_InterruptHandler to an interrupt system such that it will be called when
* an interrupt occurs. This function does not save and restore the processor
* context such that the user must provide this processing.
*
* The driver handles the following interrupts:
* - Data Transmit Register/FIFO Empty
* - Data Transmit FIFO Half Empty
* - Data Transmit Register/FIFO Underrun
* - Data Receive Register/FIFO Overrun
* - Mode Fault Error
* - Slave Mode Fault Error
* - Slave Mode Select
* - Data Receive FIFO not Empty
*
* The Data Transmit Register/FIFO Empty interrupt indicates that the SPI device
* has transmitted all the data available to transmit, and now its data register
* (or FIFO) is empty. The driver uses this interrupt to indicate progress while
* sending data.  The driver may have more data to send, in which case the data
* transmit register (or FIFO) is filled for subsequent transmission. When this
* interrupt arrives and all the data has been sent, the driver invokes the
* status callback with a value of XST_SPI_TRANSFER_DONE to inform the upper
* layer software that all data has been sent.
*
* The Data Transmit FIFO Half Empty interrupt indicates that the SPI device has
* transmitted half of the data available, in the FIFO, to transmit. The driver
* uses this interrupt to indicate progress while sending data.  The driver may
* have more data to send, in which case the data transmit FIFO is filled for
* subsequent transmission. This interrupt is particualrly useful in slave mode,
* while transfering more than FIFO_DEPTH number of bytes. In this case, the
* driver ensures that the FIFO is never empty during a transfer and avoids
* master receiving invalid data.
*
* The Data Transmit Register/FIFO Underrun interrupt indicates that, as slave,
* the SPI device was required to transmit but there was no data available to
* transmit in the transmit register (or FIFO). This may not be an error if the
* master is not expecting data, but in the case where the master is expecting
* data this serves as a notification of such a condition. The driver reports
* this condition to the upper layer software through the status handler.
*
* The Data Receive Register/FIFO Overrun interrupt indicates that the SPI device
* received data and subsequently dropped the data because the data receive
* register (or FIFO) was full. The interrupt applies to both master and slave
* operation. The driver reports this condition to the upper layer software
* through the status handler. This likely indicates a problem with the higher
* layer protocol, or a problem with the slave performance.
*
* The Mode Fault Error interrupt indicates that while configured as a master,
* the device was selected as a slave by another master. This can be used by the
* application for arbitration in a multimaster environment or to indicate a
* problem with arbitration. When this interrupt occurs, the driver invokes the
* status callback with a status value of XST_SPI_MODE_FAULT. It is up to the
* application to resolve the conflict.
*
* The Slave Mode Fault Error interrupt indicates that a slave device was
* selected as a slave by a master, but the slave device was disabled.  This can
* be used during system debugging or by the slave application to learn when the
* slave application has not prepared for a master operation in a timely fashion.
* This likely indicates a problem with the higher layer protocol, or a problem
* with the slave performance.
*
* The Slave Mode Select interrupt indicates that the SPI device was selected as
* a slave by a master. The driver reports this condition to the upper layer
* software through the status handler.
*
* Data Receive FIFO not Empty interrupt indicates that the SPI device, in slave
* mode, has received a data byte in the Data Receive FIFO, after the master has
* started a transfer. The driver reports this condition to the upper layer
* software through the status handler.
*
* <b>Polled Operation</b>
*
* This driver operates in polled mode operation too. To put the driver in polled
* mode the Global Interrupt must be disabled after the Spi is Initialized and
* Spi driver is started.
*
* Statistics are not updated in this mode of operation.
*
* <b>Device Busy</b>
*
* Some operations are disallowed when the device is busy. The driver tracks
* whether a device is busy. The device is considered busy when a data transfer
* request is outstanding, and is considered not busy only when that transfer
* completes (or is aborted with a mode fault error). This applies to both
* master and slave devices.
*
* <b>Device Configuration</b>
*
* The device can be configured in various ways during the FPGA implementation
* process. Configuration parameters are stored in the xspi_g.c file or passed
* in via _CfgInitialize(). A table is defined where each entry contains
* configuration information for an SPI device. This information includes such
* things as the base address of the memory-mapped device, the number of slave
* select bits in the device, and whether the device has FIFOs and is configured
* as slave-only.
*
* <b>RTOS Independence</b>
*
* This driver is intended to be RTOS and processor independent. It works
* with physical addresses only.  Any needs for dynamic memory management,
* threads or thread mutual exclusion, virtual memory, or cache control must
* be satisfied by the layer above this driver.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a rpm  10/11/01 First release
* 1.00b jhl  03/14/02 Repartitioned driver for smaller files.
* 1.01a jvb  12/14/05 I separated dependency on the static config table and
*                     xparameters.h from the driver initialization by moving
*                     _Initialize and _LookupConfig to _sinit.c. I also added
*                     the new _CfgInitialize routine.
* 1.11a wgr  03/22/07 Converted to new coding style.
* 1.11a  sv  02/22/08 Added the definition of LSB-MSB first option in xspi_l.h.
* 1.12a sdm  03/22/08 Updated the code to support 16/32 bit transfer width and
*                     polled mode of operation, removed the macros in xspi_l.h,
*                     added macros in xspi.h file, moved the interrupt
*                     register/bit definitions from xspi_i.h to xpsi_l.h.
*                     Even for the polled mode of operation the Interrupt Logic
*                     in the core should be included. The driver can be put in
*                     polled mode of operation by disabling the Global Interrupt
*                     after the Spi Initialization is completed and Spi is
*                     started.
* 2.00a sdm  07/30/08 Updated the code to support 16/32 bit transfer width and
*                     polled mode of operation, removed the macros in xspi_l.h,
*                     added macros in xspi.h file, moved the interrupt
*                     register/bit definitions from xspi_i.h to xpsi_l.h.
*                     Even for the polled mode of operation the Interrupt Logic
*                     in the core should be included. The driver can be put in
*                     polled mode of operation by disabling the Global Interrupt
*                     after the Spi Initialization is completed and Spi is
*                     started.
* 2.01a sdm  08/22/08 Removed support for static interrupt handlers from the MDD
*		      file
* 2.01b sdm  04/08/09 Fixed an issue in the XSpi_Transfer function where the
*                     Global Interrupt is being enabled in polled mode when a
*                     slave is not selected.
* 3.00a ktn  10/22/09 Converted all register accesses to 32 bit access.
*		      Updated driver to use the HAL APIs/macros.
*		      Removed the macro XSpi_mReset, XSpi_Reset API should be
*		      used in its place.
*		      The macros have been renamed to remove _m from the name
*		      XSpi_mIntrGlobalEnable is renamed XSpi_IntrGlobalEnable,
*		      XSpi_mIntrGlobalDisable is now XSpi_IntrGlobalDisable,
*		      XSpi_mIsIntrGlobalEnabled is now XSpi_IsIntrGlobalEnabled,
*		      XSpi_mIntrGetStatus is now XSpi_IntrGetStatus,
*		      XSpi_mIntrClear is now XSpi_IntrClear,
*		      XSpi_mIntrEnable is now XSpi_IntrEnable,
*		      XSpi_mIntrDisable is now XSpi_IntrDisable,
*		      XSpi_mIntrGetEnabled is now XSpi_IntrGetEnabled,
*		      XSpi_mSetControlReg is now XSpi_SetControlReg,
*		      XSpi_mGetControlReg is now XSpi_GetControlReg,
*		      XSpi_mGetStatusReg is now XSpi_GetStatusReg,
*		      XSpi_mSetSlaveSelectReg is now XSpi_SetSlaveSelectReg,
*		      XSpi_mGetSlaveSelectReg is now XSpi_GetSlaveSelectReg,
*		      XSpi_mEnable is now XSpi_Enable,
*		      XSpi_mDisable is now XSpi_Disable.
* 3.01a sdm  04/23/10 Updated the driver to handle new slave mode interrupts
*		      and the DTR Half Empty interrupt.
* 3.02a sdm  03/30/11 Updated to support axi_qspi.
* 3.03a sdm  08/09/11 Updated the selftest to check for a correct default value
*		      in the case of axi_qspi - CR 620502
*		      Updated tcl to generate a config parameter for C_SPI_MODE
*
* </pre>
*
******************************************************************************/

#ifndef XSPI_H			/* prevent circular inclusions */
#define XSPI_H			/* by using protection macros */

#ifdef __cplusplus
extern "C" {
#endif

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

#include "xil_types.h"
#include "xil_assert.h"
#include "xstatus.h"
#include "xspi_l.h"

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

/** @name Configuration options
 *
 * The following options may be specified or retrieved for the device and
 * enable/disable additional features of the SPI.  Each of the options
 * are bit fields, so more than one may be specified.
 *
 * @{
 */
/**
 * <pre>
 * The Master option configures the SPI device as a master. By default, the
 * device is a slave.
 *
 * The Active Low Clock option configures the device's clock polarity. Setting
 * this option means the clock is active low and the SCK signal idles high. By
 * default, the clock is active high and SCK idles low.
 *
 * The Clock Phase option configures the SPI device for one of two transfer
 * formats.  A clock phase of 0, the default, means data if valid on the first
 * SCK edge (rising or falling) after the slave select (SS) signal has been
 * asserted. A clock phase of 1 means data is valid on the second SCK edge
 * (rising or falling) after SS has been asserted.
 *
 * The Loopback option configures the SPI device for loopback mode.  Data is
 * looped back from the transmitter to the receiver.
 *
 * The Manual Slave Select option, which is default, causes the device not
 * to automatically drive the slave select.  The driver selects the device
 * at the start of a transfer and deselects it at the end of a transfer.
 * If this option is off, then the device automatically toggles the slave
 * select signal between bytes in a transfer.
 * </pre>
 */
#define XSP_MASTER_OPTION		0x1
#define XSP_CLK_ACTIVE_LOW_OPTION	0x2
#define XSP_CLK_PHASE_1_OPTION		0x4
#define XSP_LOOPBACK_OPTION		0x8
#define XSP_MANUAL_SSELECT_OPTION	0x10
/*@}*/

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

/******************************************************************************/
/**
* The handler data type allows the user to define a callback function to
* handle the asynchronous processing of the SPI driver.  The application using
* this driver is expected to define a handler of this type to support interrupt
* driven mode.  The handler executes in an interrupt context such that minimal
* processing should be performed.
*
* @param CallBackRef	A callback reference passed in by the upper layer when
*			setting the callback functions, and passed back to the
*			upper layer when the callback is invoked. Its type is
*			unimportant to the driver component, so it is a void
*			pointer.
* @param StatusEvent	Indicates one or more status events that occurred. See
*			the XSpi_SetStatusHandler() for details on the status
*			events that can be passed in the callback.
* @param ByteCount	Indicates how many bytes of data were successfully
*			transferred.  This may be less than the number of bytes
*			requested if the status event indicates an error.
*
*******************************************************************************/
typedef void (*XSpi_StatusHandler) (void *CallBackRef, u32 StatusEvent,
					unsigned int ByteCount);

/**
 * XSpi statistics
 */
typedef struct {
	u32 ModeFaults;		/**< Number of mode fault errors */
	u32 XmitUnderruns;	/**< Number of transmit underruns */
	u32 RecvOverruns;	/**< Number of receive overruns */
	u32 SlaveModeFaults;	/**< Num of selects as slave while disabled */
	u32 BytesTransferred;	/**< Number of bytes transferred */
	u32 NumInterrupts;	/**< Number of transmit/receive interrupts */
} XSpi_Stats;

/**
 * This typedef contains configuration information for the device.
 */
typedef struct {
	u16 DeviceId;		/**< Unique ID  of device */
	u32 BaseAddress;	/**< Base address of the device */
	int HasFifos;		/**< Does device have FIFOs? */
	u32 SlaveOnly;		/**< Is the device slave only? */
	u8 NumSlaveBits;	/**< Num of slave select bits on the device */
	u8 DataWidth;		/**< Data transfer Width */
	u8 SpiMode;		/**< Standard/Dual/Quad mode */
} XSpi_Config;

/**
 * The XSpi driver instance data. The user is required to allocate a
 * variable of this type for every SPI device in the system. A pointer
 * to a variable of this type is then passed to the driver API functions.
 */
typedef struct {
	XSpi_Stats Stats;	/**< Statistics */
	u32 BaseAddr;		/**< Base address of device (IPIF) */
	int IsReady;		/**< Device is initialized and ready */
	int IsStarted;		/**< Device has been started */
	int HasFifos;		/**< Device is configured with FIFOs or not */
	u32 SlaveOnly;		/**< Device is configured to be slave only */
	u8 NumSlaveBits;	/**< Number of slave selects for this device */
	u8 DataWidth;		/**< Data Transfer Width 8 or 16 or 32 */
	u8 SpiMode;		/**< Standard/Dual/Quad mode */
	u32 SlaveSelectMask;	/**< Mask that matches the number of SS bits */
	u32 SlaveSelectReg;	/**< Slave select register */

	u8 *SendBufferPtr;	/**< Buffer to send  */
	u8 *RecvBufferPtr;	/**< Buffer to receive */
	unsigned int RequestedBytes; /**< Total bytes to transfer (state) */
	unsigned int RemainingBytes; /**< Bytes left to transfer (state) */
	int IsBusy;		/**< A transfer is in progress (state) */

	XSpi_StatusHandler StatusHandler; /**< Status Handler */
	void *StatusRef;	/**< Callback reference for status handler */
} XSpi;

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

/******************************************************************************/
/**
*
* This macro writes to the global interrupt enable register to enable
* interrupts from the device.
*
* Interrupts enabled using XSpi_IntrEnable() will not occur until the global
* interrupt enable bit is set by using this function.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	None.
*
* @note		C-Style signature:
*		void XSpi_IntrGlobalEnable(XSpi *InstancePtr);
*
******************************************************************************/
#define XSpi_IntrGlobalEnable(InstancePtr)				\
	XSpi_WriteReg(((InstancePtr)->BaseAddr),  XSP_DGIER_OFFSET, 	\
			XSP_GINTR_ENABLE_MASK)

/******************************************************************************/
/**
*
* This macro disables all interrupts for the device by writing to the Global
* interrupt enable register.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	None.
*
* @note		C-Style signature:
*		void XSpi_IntrGlobalDisable(XSpi *InstancePtr);
*
******************************************************************************/
#define XSpi_IntrGlobalDisable(InstancePtr) 				\
	XSpi_WriteReg(((InstancePtr)->BaseAddr),  XSP_DGIER_OFFSET, 0)

/******************************************************************************/
/**
*
* This function determines if interrupts are enabled at the global level by
* reading the global interrupt register.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return
*		- TRUE if global interrupts are enabled.
*		- FALSE if global interrupts are disabled.
*
* @note		C-Style signature:
*		int XSpi_IsIntrGlobalEnabled(XSpi *InstancePtr);
*
******************************************************************************/
#define XSpi_IsIntrGlobalEnabled(InstancePtr)				\
	(XSpi_ReadReg(((InstancePtr)->BaseAddr), XSP_DGIER_OFFSET) ==  \
		XSP_GINTR_ENABLE_MASK)

/******************************************************************************/
/**
*
* This function gets the contents of the Interrupt Status Register.
* This register indicates the status of interrupt sources for the device.
* The status is independent of whether interrupts are enabled such
* that the status register may also be polled when interrupts are not enabled.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	A status which contains the value read from the Interrupt
*		Status Register.
*
* @note		C-Style signature:
*		u32 XSpi_IntrGetStatus(XSpi *InstancePtr);
*
******************************************************************************/
#define XSpi_IntrGetStatus(InstancePtr) \
	XSpi_ReadReg(((InstancePtr)->BaseAddr), XSP_IISR_OFFSET)

/******************************************************************************/
/**
*
* This function clears the specified interrupts in the Interrupt status
* Register. The interrupt is cleared by writing to this register with the bits
* to be cleared set to a one and all others bits to zero. Setting a bit which
* is zero within this register causes an interrupt to be generated.
*
* This function writes only the specified value to the register such that
* some status bits may be set and others cleared.  It is the caller's
* responsibility to get the value of the register prior to setting the value
* to prevent an destructive behavior.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
* @param	ClearMask is the Bitmask for interrupts to be cleared.
*		Bit positions of "1" clears the interrupt. Bit positions of 0
*		will keep the previous setting. This mask is formed by OR'ing
*		XSP_INTR_* bits defined in xspi_l.h.
*
* @return	None.
*
* @note		C-Style signature:
*		void XSpi_IntrClear(XSpi *InstancePtr, u32 ClearMask);
*
******************************************************************************/
#define XSpi_IntrClear(InstancePtr, ClearMask) 			\
	XSpi_WriteReg(((InstancePtr)->BaseAddr),  XSP_IISR_OFFSET,	\
		XSpi_IntrGetStatus(InstancePtr) | (ClearMask))


/******************************************************************************/
/**
*
* This function sets the contents of the Interrupt Enable Register.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
* @param	EnableMask is the bitmask of the interrupts to be enabled.
*		Bit positions of 1 will be enabled. Bit positions of 0 will
*		keep the previous setting. This mask is formed by OR'ing
*		XSP_INTR_* bits defined in xspi_l.h.
*
* @return 	None.
*
* @note		C-Style signature:
*		void XSpi_IntrEnable(XSpi *InstancePtr, u32 EnableMask);
*
******************************************************************************/
#define XSpi_IntrEnable(InstancePtr, EnableMask)			\
	XSpi_WriteReg(((InstancePtr)->BaseAddr), XSP_IIER_OFFSET,	\
		(XSpi_ReadReg(((InstancePtr)->BaseAddr), 		\
			XSP_IIER_OFFSET)) | (((EnableMask) & XSP_INTR_ALL )))

/****************************************************************************/
/**
*
* Disable the specified Interrupts in the Interrupt Enable Register.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
* @param	DisableMask is the bitmask of the interrupts to be disabled.
*		Bit positions of 1 will be disabled. Bit positions of 0 will
*		keep the previous setting. This mask is formed by OR'ing
*		XSP_INTR_* bits defined in xspi_l.h.
*
* @return	None.
*
* @note		C-Style signature:
*		void XSpi_IntrDisable(XSpi *InstancePtr, u32 DisableMask);
*
******************************************************************************/
#define XSpi_IntrDisable(InstancePtr, DisableMask) 			\
	XSpi_WriteReg(((InstancePtr)->BaseAddr), XSP_IIER_OFFSET,	\
		XSpi_ReadReg(((InstancePtr)->BaseAddr), 		\
			XSP_IIER_OFFSET) & (~ ((DisableMask) & XSP_INTR_ALL )))


/******************************************************************************/
/**
*
* This function gets the contents of the Interrupt Enable Register.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	The contents read from the Interrupt Enable Register.
*
* @note		C-Style signature:
*		u32 XSpi_IntrGetEnabled(XSpi *InstancePtr)
*
******************************************************************************/
#define XSpi_IntrGetEnabled(InstancePtr) \
	XSpi_ReadReg(((InstancePtr)->BaseAddr),  XSP_IIER_OFFSET)

/****************************************************************************/
/**
*
* Set the contents of the control register. Use the XSP_CR_* constants defined
* above to create the bit-mask to be written to the register.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
* @param	Mask is the 32-bit value to write to the control register.
*
* @return	None.
*
* @note		C-Style signature:
* 		void XSpi_SetControlReg(XSpi *InstancePtr, u32 Mask);
*
*****************************************************************************/
#define XSpi_SetControlReg(InstancePtr, Mask) \
	XSpi_WriteReg(((InstancePtr)->BaseAddr), XSP_CR_OFFSET, (Mask))

/****************************************************************************/
/**
*
* Get the contents of the control register. Use the XSP_CR_* constants defined
* above to interpret the bit-mask returned.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	A 32-bit value representing the contents of the control
*		register.
*
* @note		C-Style signature:
* 		u32 XSpi_GetControlReg(XSpi *InstancePtr);
*
*****************************************************************************/
#define XSpi_GetControlReg(InstancePtr) \
	XSpi_ReadReg(((InstancePtr)->BaseAddr), XSP_CR_OFFSET)

/****************************************************************************/
/**
*
* Get the contents of the status register. Use the XSP_SR_* constants defined
* above to interpret the bit-mask returned.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	An 32-bit value representing the contents of the status
*		register.
*
* @note		C-Style signature:
* 		u8 XSpi_GetStatusReg(XSpi *InstancePtr);
*
*****************************************************************************/
#define XSpi_GetStatusReg(InstancePtr) \
	XSpi_ReadReg(((InstancePtr)->BaseAddr), XSP_SR_OFFSET)

/****************************************************************************/
/**
*
* Set the contents of the slave select register. Each bit in the mask
* corresponds to a slave select line. Only one slave should be selected at
* any one time.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
* @param	Mask is the 32-bit value to write to the slave select register.
*
* @return	None.
*
* @note		C-Style signature:
* 		void XSpi_SetSlaveSelectReg(XSpi *InstancePtr, u32 Mask);
*
*****************************************************************************/
#define XSpi_SetSlaveSelectReg(InstancePtr, Mask) \
	XSpi_WriteReg(((InstancePtr)->BaseAddr), XSP_SSR_OFFSET, (Mask))

/****************************************************************************/
/**
*
* Get the contents of the slave select register. Each bit in the mask
* corresponds to a slave select line. Only one slave should be selected at
* any one time.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	The 32-bit value in the slave select register.
*
* @note		C-Style signature:
* 		u32 XSpi_GetSlaveSelectReg(XSpi *InstancePtr);
*
*****************************************************************************/
#define XSpi_GetSlaveSelectReg(InstancePtr) 			\
	XSpi_ReadReg((InstancePtr)->BaseAddr, XSP_SSR_OFFSET)

/****************************************************************************/
/**
*
* Enable the device and uninhibit master transactions. Preserves the current
* contents of the control register.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	None.
*
* @note		C-Style signature:
* 		void XSpi_Enable(XSpi *InstancePtr);
*
*****************************************************************************/
#define XSpi_Enable(InstancePtr) \
{ \
	u16 Control; \
	Control = XSpi_GetControlReg((InstancePtr)); \
	Control |= XSP_CR_ENABLE_MASK; \
	Control &= ~XSP_CR_TRANS_INHIBIT_MASK; \
	XSpi_SetControlReg((InstancePtr), Control); \
}

/****************************************************************************/
/**
*
* Disable the device. Preserves the current contents of the control register.
*
* @param	InstancePtr is a pointer to the XSpi instance to be worked on.
*
* @return	None.
*
* @note		C-Style signature:
* 		void XSpi_Disable(XSpi *InstancePtr);
*
*****************************************************************************/
#define XSpi_Disable(InstancePtr) \
	XSpi_SetControlReg((InstancePtr), \
	XSpi_GetControlReg((InstancePtr)) & ~XSP_CR_ENABLE_MASK)

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

/*
 * Initialization functions in xspi_sinit.c
 */
int XSpi_Initialize(XSpi *InstancePtr, u16 DeviceId);
XSpi_Config *XSpi_LookupConfig(u16 DeviceId);

/*
 * Functions, in xspi.c
 */
int XSpi_CfgInitialize(XSpi *InstancePtr, XSpi_Config * Config,
		       u32 EffectiveAddr);

int XSpi_Start(XSpi *InstancePtr);
int XSpi_Stop(XSpi *InstancePtr);

void XSpi_Reset(XSpi *InstancePtr);

int XSpi_SetSlaveSelect(XSpi *InstancePtr, u32 SlaveMask);
u32 XSpi_GetSlaveSelect(XSpi *InstancePtr);

int XSpi_Transfer(XSpi *InstancePtr, u8 *SendBufPtr, u8 *RecvBufPtr,
		  unsigned int ByteCount);

void XSpi_SetStatusHandler(XSpi *InstancePtr, void *CallBackRef,
			   XSpi_StatusHandler FuncPtr);
void XSpi_InterruptHandler(void *InstancePtr);


/*
 * Functions for selftest, in xspi_selftest.c
 */
int XSpi_SelfTest(XSpi *InstancePtr);

/*
 * Functions for statistics, in xspi_stats.c
 */
void XSpi_GetStats(XSpi *InstancePtr, XSpi_Stats *StatsPtr);
void XSpi_ClearStats(XSpi *InstancePtr);

/*
 * Functions for options, in xspi_options.c
 */
int XSpi_SetOptions(XSpi *InstancePtr, u32 Options);
u32 XSpi_GetOptions(XSpi *InstancePtr);

#ifdef __cplusplus
}
#endif

#endif /* end of protection macro */
