u-boot/board/xilinx/xilinx_enet/xemac_intr.c

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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);
}
}