* Patch by Peter Ryser, 20 Feb 2004:

  Add support for the Xilinx ML300 platform

* Patch by Stephan Linz, 17 Feb 2004:
  Fix watchdog support for NIOS

* Patch by Josh Fryman, 16 Feb 2004:
  Fix byte-swapping for cfi_flash.c for different bus widths

* Patch by Jon Diekema, 14 Jeb 2004:
  Remove duplicate "FPGA Support" notes from the README file

1 files changed, 482 insertions, 0 deletions

diff --git a/board/xilinx/xilinx_enet/xemac_polled.c b/board/xilinx/xilinx_enet/xemac_polled.c
new file mode 100644
index 0000000..23768bc
--- /dev/null
+++ b/board/xilinx/xilinx_enet/xemac_polled.c
@@ -0,0 +1,482 @@
+/******************************************************************************
+*
+*     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;
+}