Xilinx Processor IP Library

Software Drivers

xintc.c File Reference

Detailed Description

Contains required functions for the XIntc driver for the Xilinx Interrupt Controller. See xintc.h for a detailed description of the driver.

 MODIFICATION HISTORY:

 Ver   Who  Date     Changes
 ----- ---- -------- --------------------------------------------------------
 1.00a ecm  08/16/01 First release
 1.00b jhl  02/21/02 Repartitioned the driver for smaller files
 1.00b jhl  04/24/02 Made LookupConfig global and compressed ack before table
                     in the configuration into a bit mask
 1.00c rpm  10/17/03 New release. Support the static vector table created
                     in the xintc_g.c configuration table.
 1.00c rpm  04/23/04 Removed check in XIntc_Connect for a previously connected
                     handler. Always overwrite the vector table handler with
                     the handler provided as an argument.
 1.10c mta  03/21/07 Updated to new coding style
 1.11a sv   11/21/07 Updated driver to support access through a DCR bridge
 2.00a ktn  10/20/09 Updated to use HAL Processor APIs.
 2.04a bss  01/13/12 Added XIntc_ConnectFastHandler API for Fast Interrupt
		      and XIntc_SetNormalIntrMode for setting to normal
		      interrupt mode.
 2.05a bss  08/16/12 Updated to support relocatable vectors in Microblaze,
		      updated XIntc_SetNormalIntrMode to use IntVectorAddr
		      which is the interrupt vector address
 2.06a bss  01/28/13 To support Cascade mode:
		      Modified XIntc_Initialize,XIntc_Start,XIntc_Connect
		      XIntc_Disconnect,XIntc_Enable,XIntc_Disable,
		      XIntc_Acknowledge,XIntc_ConnectFastHandler and
		      XIntc_SetNormalIntrMode APIs.
		      Added XIntc_InitializeSlaves API.
 3.0   bss  01/28/13 Modified to initialize IVAR register with
		      XPAR_MICROBLAZE_BASE_VECTORS + 0x10 to fix
		      CR#765931

#include "xil_types.h"
#include "xil_assert.h"
#include "xintc.h"
#include "xintc_l.h"
#include "xintc_i.h"

Functions

int XIntc_Initialize (XIntc *InstancePtr, u16 DeviceId)
int XIntc_Start (XIntc *InstancePtr, u8 Mode)
void XIntc_Stop (XIntc *InstancePtr)
int XIntc_Connect (XIntc *InstancePtr, u8 Id, XInterruptHandler Handler, void *CallBackRef)
void XIntc_Disconnect (XIntc *InstancePtr, u8 Id)
void XIntc_Enable (XIntc *InstancePtr, u8 Id)
void XIntc_Disable (XIntc *InstancePtr, u8 Id)
void XIntc_Acknowledge (XIntc *InstancePtr, u8 Id)
XIntc_Config * XIntc_LookupConfig (u16 DeviceId)
int XIntc_ConnectFastHandler (XIntc *InstancePtr, u8 Id, XFastInterruptHandler Handler)
void XIntc_SetNormalIntrMode (XIntc *InstancePtr, u8 Id)

Function Documentation

void XIntc_Acknowledge (  XIntc *  InstancePtr,
u8  Id
) 
 

Acknowledges the interrupt source provided as the argument Id. When the interrupt is acknowledged, it causes the interrupt controller to clear its interrupt condition.In Cascade mode, acknowledges corresponding interrupt source of Slave controllers depending on the Id.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Id contains the ID of the interrupt source and should be in the range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the highest priority interrupt.
Returns:
None.
Note:
None.

int XIntc_Connect (  XIntc *  InstancePtr,
u8  Id,
XInterruptHandler  Handler,
void *  CallBackRef
) 
 

Makes the connection between the Id of the interrupt source and the associated handler that is to run when the interrupt is recognized. The argument provided in this call as the Callbackref is used as the argument for the handler when it is called. In Cascade mode, connects handler to Slave controller handler table depending on the interrupt Id.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Id contains the ID of the interrupt source and should be in the range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the highest priority interrupt.
Handler to the handler for that interrupt.
CallBackRef is the callback reference, usually the instance pointer of the connecting driver.
Returns:
  • XST_SUCCESS if the handler was connected correctly.

Note:
WARNING: The handler provided as an argument will overwrite any handler that was previously connected.

int XIntc_ConnectFastHandler (  XIntc *  InstancePtr,
u8  Id,
XFastInterruptHandler  Handler
) 
 

Makes the connection between the Id of the interrupt source and the associated handler that is to run when the interrupt is recognized.In Cascade mode, connects handler to corresponding Slave controller IVAR register depending on the Id and sets all interrupt sources of the Slave controller as fast interrupts.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Id contains the ID of the interrupt source and should be in the range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the highest priority interrupt.
Handler to the handler for that interrupt.
Returns:
  • XST_SUCCESS
Note:
Slave controllers in Cascade Mode should have all as Fast interrupts or Normal interrupts, mixed interrupts are not supported
WARNING: The handler provided as an argument will overwrite any handler that was previously connected.

void XIntc_Disable (  XIntc *  InstancePtr,
u8  Id
) 
 

Disables the interrupt source provided as the argument Id such that the interrupt controller will not cause interrupts for the specified Id. The interrupt controller will continue to hold an interrupt condition for the Id, but will not cause an interrupt.In Cascade mode, disables corresponding interrupt of Slave controllers depending on the Id.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Id contains the ID of the interrupt source and should be in the range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the highest priority interrupt.
Returns:
None.
Note:
None.

void XIntc_Disconnect (  XIntc *  InstancePtr,
u8  Id
) 
 

Updates the interrupt table with the Null Handler and NULL arguments at the location pointed at by the Id. This effectively disconnects that interrupt source from any handler. The interrupt is disabled also. In Cascade mode, disconnects handler from Slave controller handler table depending on the interrupt Id.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Id contains the ID of the interrupt source and should be in the range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the highest priority interrupt.
Returns:
None.
Note:
None.

void XIntc_Enable (  XIntc *  InstancePtr,
u8  Id
) 
 

Enables the interrupt source provided as the argument Id. Any pending interrupt condition for the specified Id will occur after this function is called. In Cascade mode, enables corresponding interrupt of Slave controllers depending on the Id.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Id contains the ID of the interrupt source and should be in the range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the highest priority interrupt.
Returns:
None.
Note:
None.

int XIntc_Initialize (  XIntc *  InstancePtr,
u16  DeviceId
) 
 

Initialize a specific interrupt controller instance/driver. The initialization entails:

  • Initialize fields of the XIntc structure
  • Initial vector table with stub function calls
  • All interrupt sources are disabled
  • Interrupt output is disabled

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
DeviceId is the unique id of the device controlled by this XIntc instance. Passing in a device id associates the generic XIntc instance to a specific device, as chosen by the caller or application developer.
Returns:
  • XST_SUCCESS if initialization was successful
  • XST_DEVICE_IS_STARTED if the device has already been started
  • XST_DEVICE_NOT_FOUND if device configuration information was not found for a device with the supplied device ID.
Note:
In Cascade mode this function calls XIntc_InitializeSlaves to initialiaze Slave Interrupt controllers.

XIntc_Config* XIntc_LookupConfig (  u16  DeviceId  ) 
 

Looks up the device configuration based on the unique device ID. A table contains the configuration info for each device in the system.

Parameters:
DeviceId is the unique identifier for a device.
Returns:
A pointer to the XIntc configuration structure for the specified device, or NULL if the device was not found.
Note:
None.

void XIntc_SetNormalIntrMode (  XIntc *  InstancePtr,
u8  Id
) 
 

Sets the normal interrupt mode for the specified interrupt in the Interrupt Mode Register. In Cascade mode disconnects handler from corresponding Slave controller IVAR register depending on the Id and sets all interrupt sources of the Slave controller as normal interrupts.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Id contains the ID of the interrupt source and should be in the range of 0 to XPAR_INTC_MAX_NUM_INTR_INPUTS - 1 with 0 being the highest priority interrupt.
Returns:
None.
Note:
Slave controllers in Cascade Mode should have all as Fast interrupts or Normal interrupts, mixed interrupts are not supported

int XIntc_Start (  XIntc *  InstancePtr,
u8  Mode
) 
 

Starts the interrupt controller by enabling the output from the controller to the processor. Interrupts may be generated by the interrupt controller after this function is called.

It is necessary for the caller to connect the interrupt handler of this component to the proper interrupt source. This function also starts Slave controllers in Cascade mode.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Mode determines if software is allowed to simulate interrupts or real interrupts are allowed to occur. Note that these modes are mutually exclusive. The interrupt controller hardware resets in a mode that allows software to simulate interrupts until this mode is exited. It cannot be reentered once it has been exited.
One of the following values should be used for the mode.
  • XIN_SIMULATION_MODE enables simulation of interrupts only
  • XIN_REAL_MODE enables hardware interrupts only

Returns:
  • XST_SUCCESS if the device was started successfully
  • XST_FAILURE if simulation mode was specified and it could not be set because real mode has already been entered.
Note:
Must be called after XIntc initialization is completed.

void XIntc_Stop (  XIntc *  InstancePtr  ) 
 

Stops the interrupt controller by disabling the output from the controller so that no interrupts will be caused by the interrupt controller.

Parameters:
InstancePtr is a pointer to the XIntc instance to be worked on.
Returns:
None.
Note:
None.
Copyright @ 1995-2014 Xilinx, Inc. All rights reserved.