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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_polled.c
+*
+* Contains functions used when the driver is in polled mode. Use the
+* XEmac_SetOptions() function to put the driver into polled mode.
+*
+* <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
+* </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 ******************************/
+
+/*****************************************************************************/
+/**
+*
+* Send an Ethernet frame in polled mode. The device/driver must be in polled
+* mode before calling this function. The driver writes the frame directly to
+* the MAC's packet FIFO, then enters a loop checking the device status for
+* completion or error. Statistics are updated if an error occurs. The buffer
+* to be sent must be word-aligned.
+*
+* It is assumed that the upper layer software supplies a correctly formatted
+* Ethernet frame, including the destination and source addresses, the
+* type/length field, and the data field. It is also assumed that upper layer
+* software does not append FCS at the end of the frame.
+*
+* @param InstancePtr is a pointer to the XEmac instance to be worked on.
+* @param BufPtr is a pointer to a word-aligned buffer containing the Ethernet
+* frame to be sent.
+* @param ByteCount is the size of the Ethernet frame.
+*
+* @return
+*
+* - XST_SUCCESS if the frame was sent successfully
+* - XST_DEVICE_IS_STOPPED if the device has not yet been started
+* - XST_NOT_POLLED if the device is not in polled mode
+* - XST_FIFO_NO_ROOM if there is no room in the EMAC's length FIFO for this frame
+* - XST_FIFO_ERROR if the FIFO was overrun or underrun. This error is critical
+* and requires the caller to reset the device.
+* - XST_EMAC_COLLISION if the send failed due to excess deferral or late
+* collision
+*
+* @note
+*
+* There is the possibility that this function will not return if the hardware
+* is broken (i.e., it never sets the status bit indicating that transmission is
+* done). If this is of concern to the user, the user should provide protection
+* from this problem - perhaps by using a different timer thread to monitor the
+* PollSend thread. On a 10Mbps MAC, it takes about 1.21 msecs to transmit a
+* maximum size Ethernet frame (1518 bytes). On a 100Mbps MAC, it takes about
+* 121 usecs to transmit a maximum size Ethernet frame.
+*
+* @internal
+*
+* The EMAC uses FIFOs behind its length and status registers. For this reason,
+* it is important to keep the length, status, and data FIFOs in sync when
+* reading or writing to them.
+*
+******************************************************************************/
+XStatus
+XEmac_PollSend(XEmac * InstancePtr, u8 * BufPtr, u32 ByteCount)
+{
+ u32 IntrStatus;
+ u32 XmitStatus;
+ XStatus Result;
+
+ XASSERT_NONVOID(InstancePtr != NULL);
+ XASSERT_NONVOID(BufPtr != NULL);
+ XASSERT_NONVOID(ByteCount > XEM_HDR_SIZE); /* send at least 1 byte */
+ XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+ /*
+ * Be sure the device is configured for polled mode and it is started
+ */
+ if (!InstancePtr->IsPolled) {
+ return XST_NOT_POLLED;
+ }
+
+ if (InstancePtr->IsStarted != XCOMPONENT_IS_STARTED) {
+ return XST_DEVICE_IS_STOPPED;
+ }
+
+ /*
+ * Check for overruns and underruns for the transmit status and length
+ * FIFOs and make sure the send packet FIFO is not deadlocked. Any of these
+ * conditions is bad enough that we do not want to continue. The upper layer
+ * software should reset the device to resolve the error.
+ */
+ IntrStatus = XIIF_V123B_READ_IISR(InstancePtr->BaseAddress);
+
+ /*
+ * Overrun errors
+ */
+ if (IntrStatus & (XEM_EIR_XMIT_SFIFO_OVER_MASK |
+ XEM_EIR_XMIT_LFIFO_OVER_MASK)) {
+ InstancePtr->Stats.XmitOverrunErrors++;
+ InstancePtr->Stats.FifoErrors++;
+ return XST_FIFO_ERROR;
+ }
+
+ /*
+ * Underrun errors
+ */
+ if (IntrStatus & (XEM_EIR_XMIT_SFIFO_UNDER_MASK |
+ XEM_EIR_XMIT_LFIFO_UNDER_MASK)) {
+ InstancePtr->Stats.XmitUnderrunErrors++;
+ InstancePtr->Stats.FifoErrors++;
+ return XST_FIFO_ERROR;
+ }
+
+ if (XPF_V100B_IS_DEADLOCKED(&InstancePtr->SendFifo)) {
+ InstancePtr->Stats.FifoErrors++;
+ return XST_FIFO_ERROR;
+ }
+
+ /*
+ * Before writing to the data FIFO, make sure the length FIFO is not
+ * full. The data FIFO might not be full yet even though the length FIFO
+ * is. This avoids an overrun condition on the length FIFO and keeps the
+ * FIFOs in sync.
+ */
+ if (IntrStatus & XEM_EIR_XMIT_LFIFO_FULL_MASK) {
+ /*
+ * Clear the latched LFIFO_FULL bit so next time around the most
+ * current status is represented
+ */
+ XIIF_V123B_WRITE_IISR(InstancePtr->BaseAddress,
+ XEM_EIR_XMIT_LFIFO_FULL_MASK);
+ return XST_FIFO_NO_ROOM;
+ }
+
+ /*
+ * This is a non-blocking write. The packet FIFO returns an error if there
+ * is not enough room in the FIFO for this frame.
+ */
+ Result =
+ XPacketFifoV100b_Write(&InstancePtr->SendFifo, BufPtr, ByteCount);
+ if (Result != XST_SUCCESS) {
+ return Result;
+ }
+
+ /*
+ * Loop on the MAC's status to wait for any pause to complete.
+ */
+ IntrStatus = XIIF_V123B_READ_IISR(InstancePtr->BaseAddress);
+
+ while ((IntrStatus & XEM_EIR_XMIT_PAUSE_MASK) != 0) {
+ IntrStatus = XIIF_V123B_READ_IISR(InstancePtr->BaseAddress);
+ /*
+ * Clear the pause status from the transmit status register
+ */
+ XIIF_V123B_WRITE_IISR(InstancePtr->BaseAddress,
+ IntrStatus & XEM_EIR_XMIT_PAUSE_MASK);
+ }
+
+ /*
+ * Set the MAC's transmit packet length register to tell it to transmit
+ */
+ XIo_Out32(InstancePtr->BaseAddress + XEM_TPLR_OFFSET, ByteCount);
+
+ /*
+ * Loop on the MAC's status to wait for the transmit to complete. The
+ * transmit status is in the FIFO when the XMIT_DONE bit is set.
+ */
+ do {
+ IntrStatus = XIIF_V123B_READ_IISR(InstancePtr->BaseAddress);
+ }
+ while ((IntrStatus & XEM_EIR_XMIT_DONE_MASK) == 0);
+
+ XmitStatus = XIo_In32(InstancePtr->BaseAddress + XEM_TSR_OFFSET);
+
+ InstancePtr->Stats.XmitFrames++;
+ InstancePtr->Stats.XmitBytes += ByteCount;
+
+ /*
+ * Check for various errors, bump statistics, and return an error status.
+ */
+
+ /*
+ * Overrun errors
+ */
+ if (IntrStatus & (XEM_EIR_XMIT_SFIFO_OVER_MASK |
+ XEM_EIR_XMIT_LFIFO_OVER_MASK)) {
+ InstancePtr->Stats.XmitOverrunErrors++;
+ InstancePtr->Stats.FifoErrors++;
+ return XST_FIFO_ERROR;
+ }
+
+ /*
+ * Underrun errors
+ */
+ if (IntrStatus & (XEM_EIR_XMIT_SFIFO_UNDER_MASK |
+ XEM_EIR_XMIT_LFIFO_UNDER_MASK)) {
+ InstancePtr->Stats.XmitUnderrunErrors++;
+ InstancePtr->Stats.FifoErrors++;
+ return XST_FIFO_ERROR;
+ }
+
+ /*
+ * Clear the interrupt status register of transmit statuses
+ */
+ XIIF_V123B_WRITE_IISR(InstancePtr->BaseAddress,
+ IntrStatus & XEM_EIR_XMIT_ALL_MASK);
+
+ /*
+ * Collision errors are stored in the transmit status register
+ * instead of the interrupt status register
+ */
+ if (XmitStatus & XEM_TSR_EXCESS_DEFERRAL_MASK) {
+ InstancePtr->Stats.XmitExcessDeferral++;
+ return XST_EMAC_COLLISION_ERROR;
+ }
+
+ if (XmitStatus & XEM_TSR_LATE_COLLISION_MASK) {
+ InstancePtr->Stats.XmitLateCollisionErrors++;
+ return XST_EMAC_COLLISION_ERROR;
+ }
+
+ return XST_SUCCESS;
+}
+
+/*****************************************************************************/
+/**
+*
+* Receive an Ethernet frame in polled mode. The device/driver must be in polled
+* mode before calling this function. The driver receives the frame directly
+* from the MAC's packet FIFO. This is a non-blocking receive, in that if there
+* is no frame ready to be received at the device, the function returns with an
+* error. The MAC's error status is not checked, so statistics are not updated
+* for polled receive. The buffer into which the frame will be received must be
+* word-aligned.
+*
+* @param InstancePtr is a pointer to the XEmac instance to be worked on.
+* @param BufPtr is a pointer to a word-aligned buffer into which the received
+* Ethernet frame will be copied.
+* @param ByteCountPtr is both an input and an output parameter. It is a pointer
+* to a 32-bit word that contains the size of the buffer on entry into the
+* function and the size the received frame on return from the function.
+*
+* @return
+*
+* - XST_SUCCESS if the frame was sent successfully
+* - XST_DEVICE_IS_STOPPED if the device has not yet been started
+* - XST_NOT_POLLED if the device is not in polled mode
+* - XST_NO_DATA if there is no frame to be received from the FIFO
+* - XST_BUFFER_TOO_SMALL if the buffer to receive the frame is too small for
+* the frame waiting in the FIFO.
+*
+* @note
+*
+* Input buffer must be big enough to hold the largest Ethernet frame. Buffer
+* must also be 32-bit aligned.
+*
+* @internal
+*
+* The EMAC uses FIFOs behind its length and status registers. For this reason,
+* it is important to keep the length, status, and data FIFOs in sync when
+* reading or writing to them.
+*
+******************************************************************************/
+XStatus
+XEmac_PollRecv(XEmac * InstancePtr, u8 * BufPtr, u32 * ByteCountPtr)
+{
+ XStatus Result;
+ u32 PktLength;
+ u32 IntrStatus;
+
+ XASSERT_NONVOID(InstancePtr != NULL);
+ XASSERT_NONVOID(BufPtr != NULL);
+ XASSERT_NONVOID(ByteCountPtr != NULL);
+ XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+ /*
+ * Be sure the device is configured for polled mode and it is started
+ */
+ if (!InstancePtr->IsPolled) {
+ return XST_NOT_POLLED;
+ }
+
+ if (InstancePtr->IsStarted != XCOMPONENT_IS_STARTED) {
+ return XST_DEVICE_IS_STOPPED;
+ }
+
+ /*
+ * Make sure the buffer is big enough to hold the maximum frame size.
+ * We need to do this because as soon as we read the MAC's packet length
+ * register, which is actually a FIFO, we remove that length from the
+ * FIFO. We do not want to read the length FIFO without also reading the
+ * data FIFO since this would get the FIFOs out of sync. So we have to
+ * make this restriction.
+ */
+ if (*ByteCountPtr < XEM_MAX_FRAME_SIZE) {
+ return XST_BUFFER_TOO_SMALL;
+ }
+
+ /*
+ * First check for packet FIFO deadlock and return an error if it has
+ * occurred. A reset by the caller is necessary to correct this problem.
+ */
+ if (XPF_V100B_IS_DEADLOCKED(&InstancePtr->RecvFifo)) {
+ InstancePtr->Stats.FifoErrors++;
+ return XST_FIFO_ERROR;
+ }
+
+ /*
+ * Get the interrupt status to know what happened (whether an error occurred
+ * and/or whether frames have been received successfully). When clearing the
+ * intr status register, clear only statuses that pertain to receive.
+ */
+ IntrStatus = XIIF_V123B_READ_IISR(InstancePtr->BaseAddress);
+ XIIF_V123B_WRITE_IISR(InstancePtr->BaseAddress,
+ IntrStatus & XEM_EIR_RECV_ALL_MASK);
+
+ /*
+ * Check receive errors and bump statistics so the caller will have a clue
+ * as to why data may not have been received. We continue on if an error
+ * occurred since there still may be frames that were received successfully.
+ */
+ if (IntrStatus & (XEM_EIR_RECV_LFIFO_OVER_MASK |
+ XEM_EIR_RECV_DFIFO_OVER_MASK)) {
+ InstancePtr->Stats.RecvOverrunErrors++;
+ InstancePtr->Stats.FifoErrors++;
+ }
+
+ if (IntrStatus & XEM_EIR_RECV_LFIFO_UNDER_MASK) {
+ InstancePtr->Stats.RecvUnderrunErrors++;
+ InstancePtr->Stats.FifoErrors++;
+ }
+
+ /*
+ * General receive errors
+ */
+ if (IntrStatus & XEM_EIR_RECV_ERROR_MASK) {
+ if (IntrStatus & XEM_EIR_RECV_MISSED_FRAME_MASK) {
+ 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);
+ }
+ }
+
+ /*
+ * Before reading from the length FIFO, make sure the length FIFO is not
+ * empty. We could cause an underrun error if we try to read from an
+ * empty FIFO.
+ */
+ if ((IntrStatus & XEM_EIR_RECV_DONE_MASK) == 0) {
+ return XST_NO_DATA;
+ }
+
+ /*
+ * Determine, from the MAC, the length of the next packet available
+ * in the data FIFO (there should be a non-zero length here)
+ */
+ PktLength = XIo_In32(InstancePtr->BaseAddress + XEM_RPLR_OFFSET);
+ if (PktLength == 0) {
+ return XST_NO_DATA;
+ }
+
+ /*
+ * Write the RECV_DONE bit in the status register to clear it. This bit
+ * indicates the RPLR is non-empty, and we know it's set at this point.
+ * We clear it so that subsequent entry into this routine will reflect the
+ * current status. This is done because the non-empty bit is latched in the
+ * IPIF, which means it may indicate a non-empty condition even though
+ * there is something in the FIFO.
+ */
+ XIIF_V123B_WRITE_IISR(InstancePtr->BaseAddress, XEM_EIR_RECV_DONE_MASK);
+
+ /*
+ * We assume that the MAC never has a length bigger than the largest
+ * Ethernet frame, so no need to make another check here.
+ */
+
+ /*
+ * This is a non-blocking read. The FIFO returns an error if there is
+ * not at least the requested amount of data in the FIFO.
+ */
+ Result =
+ XPacketFifoV100b_Read(&InstancePtr->RecvFifo, BufPtr, PktLength);
+ if (Result != XST_SUCCESS) {
+ return Result;
+ }
+
+ InstancePtr->Stats.RecvFrames++;
+ InstancePtr->Stats.RecvBytes += PktLength;
+
+ *ByteCountPtr = PktLength;
+
+ return XST_SUCCESS;
+}
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