2c8f92039d
Added initial support Xilinx Embedded Software. Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
230 lines
7.2 KiB
C
Executable file
230 lines
7.2 KiB
C
Executable file
/******************************************************************************
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*
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* Copyright (C) 2002 - 2014 Xilinx, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* Use of the Software is limited solely to applications:
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* (a) running on a Xilinx device, or
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* (b) that interact with a Xilinx device through a bus or interconnect.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* XILINX CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of the Xilinx shall not be used
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* in advertising or otherwise to promote the sale, use or other dealings in
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* this Software without prior written authorization from Xilinx.
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*
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******************************************************************************/
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/*****************************************************************************/
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/**
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*
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* @file xtmrctr_intr.c
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*
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* Contains interrupt-related functions for the XTmrCtr component.
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*
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* <pre>
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* MODIFICATION HISTORY:
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*
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* Ver Who Date Changes
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* ----- ---- -------- -----------------------------------------------
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* 1.00b jhl 02/06/02 First release
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* 1.10b mta 03/21/07 Updated to new coding style
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* 2.00a ktn 10/30/09 Updated to use HAL API's. _m is removed from all the macro
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* definitions.
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* 2.03a rvo 11/30/10 Added check to see if interrupt is enabled before further
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* processing for CR 584557.
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* </pre>
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*
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******************************************************************************/
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/***************************** Include Files *********************************/
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#include "xtmrctr.h"
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/************************** Constant Definitions *****************************/
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/**************************** Type Definitions *******************************/
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/***************** Macros (Inline Functions) Definitions *********************/
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/************************** Function Prototypes ******************************/
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/************************** Variable Definitions *****************************/
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/*****************************************************************************/
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/**
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*
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* Sets the timer callback function, which the driver calls when the specified
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* timer times out.
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*
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* @param InstancePtr is a pointer to the XTmrCtr instance .
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* @param CallBackRef is the upper layer callback reference passed back
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* when the callback function is invoked.
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* @param FuncPtr is the pointer to the callback function.
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*
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* @return None.
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*
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* @note
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*
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* The handler is called within interrupt context so the function that is
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* called should either be short or pass the more extensive processing off
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* to another task to allow the interrupt to return and normal processing
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* to continue.
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*
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******************************************************************************/
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void XTmrCtr_SetHandler(XTmrCtr * InstancePtr, XTmrCtr_Handler FuncPtr,
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void *CallBackRef)
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{
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Xil_AssertVoid(InstancePtr != NULL);
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Xil_AssertVoid(FuncPtr != NULL);
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Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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InstancePtr->Handler = FuncPtr;
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InstancePtr->CallBackRef = CallBackRef;
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}
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/*****************************************************************************/
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/**
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*
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* Interrupt Service Routine (ISR) for the driver. This function only performs
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* processing for the device and does not save and restore the interrupt context.
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*
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* @param InstancePtr contains a pointer to the timer/counter instance for
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* the interrupt.
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*
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* @return None.
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*
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* @note None.
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*
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******************************************************************************/
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void XTmrCtr_InterruptHandler(void *InstancePtr)
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{
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XTmrCtr *TmrCtrPtr = NULL;
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u8 TmrCtrNumber;
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u32 ControlStatusReg;
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/*
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* Verify that each of the inputs are valid.
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*/
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Xil_AssertVoid(InstancePtr != NULL);
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/*
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* Convert the non-typed pointer to an timer/counter instance pointer
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* such that there is access to the timer/counter
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*/
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TmrCtrPtr = (XTmrCtr *) InstancePtr;
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/*
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* Loop thru each timer counter in the device and call the callback
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* function for each timer which has caused an interrupt
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*/
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for (TmrCtrNumber = 0;
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TmrCtrNumber < XTC_DEVICE_TIMER_COUNT; TmrCtrNumber++) {
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ControlStatusReg = XTmrCtr_ReadReg(TmrCtrPtr->BaseAddress,
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TmrCtrNumber,
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XTC_TCSR_OFFSET);
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/*
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* Check if interrupt is enabled
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*/
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if (ControlStatusReg & XTC_CSR_ENABLE_INT_MASK) {
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/*
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* Check if timer expired and interrupt occured
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*/
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if (ControlStatusReg & XTC_CSR_INT_OCCURED_MASK) {
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/*
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* Increment statistics for the number of
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* interrupts and call the callback to handle
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* any application specific processing
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*/
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TmrCtrPtr->Stats.Interrupts++;
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TmrCtrPtr->Handler(TmrCtrPtr->CallBackRef,
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TmrCtrNumber);
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/*
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* Read the new Control/Status Register content.
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*/
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ControlStatusReg =
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XTmrCtr_ReadReg(TmrCtrPtr->BaseAddress,
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TmrCtrNumber,
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XTC_TCSR_OFFSET);
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/*
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* If in compare mode and a single shot rather
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* than auto reload mode then disable the timer
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* and reset it such so that the interrupt can
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* be acknowledged, this should be only temporary
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* till the hardware is fixed
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*/
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if (((ControlStatusReg &
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XTC_CSR_AUTO_RELOAD_MASK) == 0) &&
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((ControlStatusReg &
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XTC_CSR_CAPTURE_MODE_MASK)== 0)) {
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/*
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* Disable the timer counter and
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* reset it such that the timer
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* counter is loaded with the
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* reset value allowing the
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* interrupt to be acknowledged
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*/
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ControlStatusReg &=
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~XTC_CSR_ENABLE_TMR_MASK;
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XTmrCtr_WriteReg(
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TmrCtrPtr->BaseAddress,
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TmrCtrNumber,
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XTC_TCSR_OFFSET,
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ControlStatusReg |
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XTC_CSR_LOAD_MASK);
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/*
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* Clear the reset condition,
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* the reset bit must be
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* manually cleared by a 2nd write
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* to the register
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*/
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XTmrCtr_WriteReg(
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TmrCtrPtr->BaseAddress,
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TmrCtrNumber,
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XTC_TCSR_OFFSET,
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ControlStatusReg);
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}
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/*
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* Acknowledge the interrupt by clearing the
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* interrupt bit in the timer control status
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* register, this is done after calling the
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* handler so the application could call
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* IsExpired, the interrupt is cleared by
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* writing a 1 to the interrupt bit of the
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* register without changing any of the other
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* bits
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*/
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XTmrCtr_WriteReg(TmrCtrPtr->BaseAddress,
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TmrCtrNumber,
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XTC_TCSR_OFFSET,
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ControlStatusReg |
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XTC_CSR_INT_OCCURED_MASK);
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}
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}
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}
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}
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