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-/******************************************************************************
-*
-* Author: Xilinx, Inc.
-*
-*
-* This program is free software; you can redistribute it and/or modify it
-* under the terms of the GNU General Public License as published by the
-* Free Software Foundation; either version 2 of the License, or (at your
-* option) any later version.
-*
-*
-* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A
-* COURTESY TO YOU. 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 THIRD PARTY 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.
-*
-*
-* Xilinx hardware products are not intended for use in life support
-* appliances, devices, or systems. Use in such applications is
-* expressly prohibited.
-*
-*
-* (c) Copyright 2002-2004 Xilinx Inc.
-* All rights reserved.
-*
-*
-* You should have received a copy of the GNU General Public License along
-* with this program; if not, write to the Free Software Foundation, Inc.,
-* 675 Mass Ave, Cambridge, MA 02139, USA.
-*
-******************************************************************************/
-/*****************************************************************************/
-/**
-*
-* @file xemac_intr.c
-*
-* This file contains general interrupt-related functions of the XEmac driver.
-*
-* <pre>
-* MODIFICATION HISTORY:
-*
-* Ver Who Date Changes
-* ----- ---- -------- -----------------------------------------------
-* 1.00a rpm 07/31/01 First release
-* 1.00b rpm 02/20/02 Repartitioned files and functions
-* 1.00c rpm 12/05/02 New version includes support for simple DMA
-* 1.00c rpm 03/31/03 Added comment to indicate that no Receive Length FIFO
-* overrun interrupts occur in v1.00l and later of the EMAC
-* device. This avoids the need to reset the device on
-* receive overruns.
-* </pre>
-*
-******************************************************************************/
-
-/***************************** Include Files *********************************/
-
-#include "xbasic_types.h"
-#include "xemac_i.h"
-#include "xio.h"
-#include "xipif_v1_23_b.h" /* Uses v1.23b of the IPIF */
-
-/************************** Constant Definitions *****************************/
-
-/**************************** Type Definitions *******************************/
-
-/***************** Macros (Inline Functions) Definitions *********************/
-
-/************************** Variable Definitions *****************************/
-
-/************************** Function Prototypes ******************************/
-
-/*****************************************************************************/
-/**
-*
-* Set the callback function for handling asynchronous errors. The upper layer
-* software should call this function during initialization.
-*
-* The error callback is invoked by the driver within interrupt context, so it
-* needs to do its job quickly. If there are potentially slow operations within
-* the callback, these should be done at task-level.
-*
-* The Xilinx errors that must be handled by the callback are:
-* - XST_DMA_ERROR indicates an unrecoverable DMA error occurred. This is
-* typically a bus error or bus timeout. The handler must reset and
-* re-configure the device.
-* - XST_FIFO_ERROR indicates an unrecoverable FIFO error occurred. This is a
-* deadlock condition in the packet FIFO. The handler must reset and
-* re-configure the device.
-* - XST_RESET_ERROR indicates an unrecoverable MAC error occurred, usually an
-* overrun or underrun. The handler must reset and re-configure the device.
-* - XST_DMA_SG_NO_LIST indicates an attempt was made to access a scatter-gather
-* DMA list that has not yet been created.
-* - XST_DMA_SG_LIST_EMPTY indicates the driver tried to get a descriptor from
-* the receive descriptor list, but the list was empty.
-*
-* @param InstancePtr is a pointer to the XEmac instance to be worked on.
-* @param CallBackRef is a reference pointer to be passed back to the adapter in
-* the callback. This helps the adapter correlate the callback to a
-* particular driver.
-* @param FuncPtr is the pointer to the callback function.
-*
-* @return
-*
-* None.
-*
-* @note
-*
-* None.
-*
-******************************************************************************/
-void
-XEmac_SetErrorHandler(XEmac * InstancePtr, void *CallBackRef,
- XEmac_ErrorHandler FuncPtr)
-{
- XASSERT_VOID(InstancePtr != NULL);
- XASSERT_VOID(FuncPtr != NULL);
- XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
-
- InstancePtr->ErrorHandler = FuncPtr;
- InstancePtr->ErrorRef = CallBackRef;
-}
-
-/****************************************************************************/
-/*
-*
-* Check the interrupt status bits of the Ethernet MAC for errors. Errors
-* currently handled are:
-* - Receive length FIFO overrun. Indicates data was lost due to the receive
-* length FIFO becoming full during the reception of a packet. Only a device
-* reset clears this condition.
-* - Receive length FIFO underrun. An attempt to read an empty FIFO. Only a
-* device reset clears this condition.
-* - Transmit status FIFO overrun. Indicates data was lost due to the transmit
-* status FIFO becoming full following the transmission of a packet. Only a
-* device reset clears this condition.
-* - Transmit status FIFO underrun. An attempt to read an empty FIFO. Only a
-* device reset clears this condition.
-* - Transmit length FIFO overrun. Indicates data was lost due to the transmit
-* length FIFO becoming full following the transmission of a packet. Only a
-* device reset clears this condition.
-* - Transmit length FIFO underrun. An attempt to read an empty FIFO. Only a
-* device reset clears this condition.
-* - Receive data FIFO overrun. Indicates data was lost due to the receive data
-* FIFO becoming full during the reception of a packet.
-* - Receive data errors:
-* - Receive missed frame error. Valid data was lost by the MAC.
-* - Receive collision error. Data was lost by the MAC due to a collision.
-* - Receive FCS error. Data was dicarded by the MAC due to FCS error.
-* - Receive length field error. Data was dicarded by the MAC due to an invalid
-* length field in the packet.
-* - Receive short error. Data was dicarded by the MAC because a packet was
-* shorter than allowed.
-* - Receive long error. Data was dicarded by the MAC because a packet was
-* longer than allowed.
-* - Receive alignment error. Data was truncated by the MAC because its length
-* was not byte-aligned.
-*
-* @param InstancePtr is a pointer to the XEmac instance to be worked on.
-* @param IntrStatus is the contents of the interrupt status register to be checked
-*
-* @return
-*
-* None.
-*
-* @note
-*
-* This function is intended for internal use only.
-*
-******************************************************************************/
-void
-XEmac_CheckEmacError(XEmac * InstancePtr, u32 IntrStatus)
-{
- u32 ResetError = FALSE;
-
- /*
- * First check for receive fifo overrun/underrun errors. Most require a
- * reset by the user to clear, but the data FIFO overrun error does not.
- */
- if (IntrStatus & XEM_EIR_RECV_DFIFO_OVER_MASK) {
- InstancePtr->Stats.RecvOverrunErrors++;
- InstancePtr->Stats.FifoErrors++;
- }
-
- if (IntrStatus & XEM_EIR_RECV_LFIFO_OVER_MASK) {
- /*
- * Receive Length FIFO overrun interrupts no longer occur in v1.00l
- * and later of the EMAC device. Frames are just dropped by the EMAC
- * if the length FIFO is full. The user would notice the Receive Missed
- * Frame count incrementing without any other errors being reported.
- * This code is left here for backward compatibility with v1.00k and
- * older EMAC devices.
- */
- InstancePtr->Stats.RecvOverrunErrors++;
- InstancePtr->Stats.FifoErrors++;
- ResetError = TRUE; /* requires a reset */
- }
-
- if (IntrStatus & XEM_EIR_RECV_LFIFO_UNDER_MASK) {
- InstancePtr->Stats.RecvUnderrunErrors++;
- InstancePtr->Stats.FifoErrors++;
- ResetError = TRUE; /* requires a reset */
- }
-
- /*
- * Now check for general receive errors. Get the latest count where
- * available, otherwise just bump the statistic so we know the interrupt
- * occurred.
- */
- if (IntrStatus & XEM_EIR_RECV_ERROR_MASK) {
- if (IntrStatus & XEM_EIR_RECV_MISSED_FRAME_MASK) {
- /*
- * Caused by length FIFO or data FIFO overruns on receive side
- */
- InstancePtr->Stats.RecvMissedFrameErrors =
- XIo_In32(InstancePtr->BaseAddress +
- XEM_RMFC_OFFSET);
- }
-
- if (IntrStatus & XEM_EIR_RECV_COLLISION_MASK) {
- InstancePtr->Stats.RecvCollisionErrors =
- XIo_In32(InstancePtr->BaseAddress + XEM_RCC_OFFSET);
- }
-
- if (IntrStatus & XEM_EIR_RECV_FCS_ERROR_MASK) {
- InstancePtr->Stats.RecvFcsErrors =
- XIo_In32(InstancePtr->BaseAddress +
- XEM_RFCSEC_OFFSET);
- }
-
- if (IntrStatus & XEM_EIR_RECV_LEN_ERROR_MASK) {
- InstancePtr->Stats.RecvLengthFieldErrors++;
- }
-
- if (IntrStatus & XEM_EIR_RECV_SHORT_ERROR_MASK) {
- InstancePtr->Stats.RecvShortErrors++;
- }
-
- if (IntrStatus & XEM_EIR_RECV_LONG_ERROR_MASK) {
- InstancePtr->Stats.RecvLongErrors++;
- }
-
- if (IntrStatus & XEM_EIR_RECV_ALIGN_ERROR_MASK) {
- InstancePtr->Stats.RecvAlignmentErrors =
- XIo_In32(InstancePtr->BaseAddress +
- XEM_RAEC_OFFSET);
- }
-
- /*
- * Bump recv interrupts stats only if not scatter-gather DMA (this
- * stat gets bumped elsewhere in that case)
- */
- if (!XEmac_mIsSgDma(InstancePtr)) {
- InstancePtr->Stats.RecvInterrupts++; /* TODO: double bump? */
- }
-
- }
-
- /*
- * Check for transmit errors. These apply to both DMA and non-DMA modes
- * of operation. The entire device should be reset after overruns or
- * underruns.
- */
- if (IntrStatus & (XEM_EIR_XMIT_SFIFO_OVER_MASK |
- XEM_EIR_XMIT_LFIFO_OVER_MASK)) {
- InstancePtr->Stats.XmitOverrunErrors++;
- InstancePtr->Stats.FifoErrors++;
- ResetError = TRUE;
- }
-
- if (IntrStatus & (XEM_EIR_XMIT_SFIFO_UNDER_MASK |
- XEM_EIR_XMIT_LFIFO_UNDER_MASK)) {
- InstancePtr->Stats.XmitUnderrunErrors++;
- InstancePtr->Stats.FifoErrors++;
- ResetError = TRUE;
- }
-
- if (ResetError) {
- /*
- * If a reset error occurred, disable the EMAC interrupts since the
- * reset-causing interrupt(s) is latched in the EMAC - meaning it will
- * keep occurring until the device is reset. In order to give the higher
- * layer software time to reset the device, we have to disable the
- * overrun/underrun interrupts until that happens. We trust that the
- * higher layer resets the device. We are able to get away with disabling
- * all EMAC interrupts since the only interrupts it generates are for
- * error conditions, and we don't care about any more errors right now.
- */
- XIIF_V123B_WRITE_IIER(InstancePtr->BaseAddress, 0);
-
- /*
- * Invoke the error handler callback, which should result in a reset
- * of the device by the upper layer software.
- */
- InstancePtr->ErrorHandler(InstancePtr->ErrorRef,
- XST_RESET_ERROR);
- }
-}
-
-/*****************************************************************************/
-/*
-*
-* Check the receive packet FIFO for errors. FIFO error interrupts are:
-* - Deadlock. See the XPacketFifo component for a description of deadlock on a
-* FIFO.
-*
-* @param InstancePtr is a pointer to the XEmac instance to be worked on.
-*
-* @return
-*
-* Although the function returns void, it can return an asynchronous error to the
-* application through the error handler. It can return XST_FIFO_ERROR if a FIFO
-* error occurred.
-*
-* @note
-*
-* This function is intended for internal use only.
-*
-******************************************************************************/
-void
-XEmac_CheckFifoRecvError(XEmac * InstancePtr)
-{
- /*
- * Although the deadlock is currently the only interrupt from a packet
- * FIFO, make sure it is deadlocked before taking action. There is no
- * need to clear this interrupt since it requires a reset of the device.
- */
- if (XPF_V100B_IS_DEADLOCKED(&InstancePtr->RecvFifo)) {
- u32 IntrEnable;
-
- InstancePtr->Stats.FifoErrors++;
-
- /*
- * Invoke the error callback function, which should result in a reset
- * of the device by the upper layer software. We first need to disable
- * the FIFO interrupt, since otherwise the upper layer thread that
- * handles the reset may never run because this interrupt condition
- * doesn't go away until a reset occurs (there is no way to ack it).
- */
- IntrEnable = XIIF_V123B_READ_DIER(InstancePtr->BaseAddress);
- XIIF_V123B_WRITE_DIER(InstancePtr->BaseAddress,
- IntrEnable & ~XEM_IPIF_RECV_FIFO_MASK);
-
- InstancePtr->ErrorHandler(InstancePtr->ErrorRef,
- XST_FIFO_ERROR);
- }
-}
-
-/*****************************************************************************/
-/*
-*
-* Check the send packet FIFO for errors. FIFO error interrupts are:
-* - Deadlock. See the XPacketFifo component for a description of deadlock on a
-* FIFO.
-*
-* @param InstancePtr is a pointer to the XEmac instance to be worked on.
-*
-* @return
-*
-* Although the function returns void, it can return an asynchronous error to the
-* application through the error handler. It can return XST_FIFO_ERROR if a FIFO
-* error occurred.
-*
-* @note
-*
-* This function is intended for internal use only.
-*
-******************************************************************************/
-void
-XEmac_CheckFifoSendError(XEmac * InstancePtr)
-{
- /*
- * Although the deadlock is currently the only interrupt from a packet
- * FIFO, make sure it is deadlocked before taking action. There is no
- * need to clear this interrupt since it requires a reset of the device.
- */
- if (XPF_V100B_IS_DEADLOCKED(&InstancePtr->SendFifo)) {
- u32 IntrEnable;
-
- InstancePtr->Stats.FifoErrors++;
-
- /*
- * Invoke the error callback function, which should result in a reset
- * of the device by the upper layer software. We first need to disable
- * the FIFO interrupt, since otherwise the upper layer thread that
- * handles the reset may never run because this interrupt condition
- * doesn't go away until a reset occurs (there is no way to ack it).
- */
- IntrEnable = XIIF_V123B_READ_DIER(InstancePtr->BaseAddress);
- XIIF_V123B_WRITE_DIER(InstancePtr->BaseAddress,
- IntrEnable & ~XEM_IPIF_SEND_FIFO_MASK);
-
- InstancePtr->ErrorHandler(InstancePtr->ErrorRef,
- XST_FIFO_ERROR);
- }
-}
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