drivers/net/xilinx_emaclite.c - platform/external/u-boot - Gitiles

 /*
  * (C) Copyright 2007 Michal Simek
  *
  * Michal SIMEK <monstr@monstr.eu>
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * 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., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 #include <common.h>
 #include <net.h>
 #include <config.h>
 #include <asm/io.h>

 #ifdef XILINX_EMACLITE_BASEADDR

 #undef DEBUG

 #define ENET_MAX_MTU		PKTSIZE
 #define ENET_MAX_MTU_ALIGNED	PKTSIZE_ALIGN
 #define ENET_ADDR_LENGTH	6

 /* EmacLite constants */
 #define XEL_BUFFER_OFFSET	0x0800	/* Next buffer's offset */
 #define XEL_TPLR_OFFSET		0x07F4	/* Tx packet length */
 #define XEL_TSR_OFFSET		0x07FC	/* Tx status */
 #define XEL_RSR_OFFSET		0x17FC	/* Rx status */
 #define XEL_RXBUFF_OFFSET	0x1000	/* Receive Buffer */

 /* Xmit complete */
 #define XEL_TSR_XMIT_BUSY_MASK		0x00000001UL
 /* Xmit interrupt enable bit */
 #define XEL_TSR_XMIT_IE_MASK		0x00000008UL
 /* Buffer is active, SW bit only */
 #define XEL_TSR_XMIT_ACTIVE_MASK	0x80000000UL
 /* Program the MAC address */
 #define XEL_TSR_PROGRAM_MASK		0x00000002UL
 /* define for programming the MAC address into the EMAC Lite */
 #define XEL_TSR_PROG_MAC_ADDR	(XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)

 /* Transmit packet length upper byte */
 #define XEL_TPLR_LENGTH_MASK_HI		0x0000FF00UL
 /* Transmit packet length lower byte */
 #define XEL_TPLR_LENGTH_MASK_LO		0x000000FFUL

 /* Recv complete */
 #define XEL_RSR_RECV_DONE_MASK		0x00000001UL
 /* Recv interrupt enable bit */
 #define XEL_RSR_RECV_IE_MASK		0x00000008UL

 typedef struct {
 	unsigned int BaseAddress;	/* Base address for device (IPIF) */
 	unsigned int NextTxBufferToUse;	/* Next TX buffer to write to */
 	unsigned int NextRxBufferToUse;	/* Next RX buffer to read from */
 	unsigned char DeviceId;		/* Unique ID of device - for future */
 } XEmacLite;

 static XEmacLite EmacLite;

 static char etherrxbuff[PKTSIZE_ALIGN]; /* Receive buffer */

 /* hardcoded MAC address for the Xilinx EMAC Core when env is nowhere*/
 #ifdef CFG_ENV_IS_NOWHERE
 static u8 EMACAddr[ENET_ADDR_LENGTH] = { 0x00, 0x0a, 0x35, 0x00, 0x22, 0x01 };
 #endif

 void XEmacLite_AlignedRead (u32 * SrcPtr, void *DestPtr, unsigned ByteCount)
 {
 	unsigned i;
 	unsigned Length = ByteCount;
 	u32 AlignBuffer;
 	u32 *To32Ptr;
 	u32 *From32Ptr;
 	u8 *To8Ptr;
 	u8 *From8Ptr;

 	From32Ptr = (u32 *) SrcPtr;

 	/* Word aligned buffer, no correction needed. */
 	To32Ptr = (u32 *) DestPtr;
 	while (Length > 3) {
 		*To32Ptr++ = *From32Ptr++;
 		Length -= 4;
 	}
 	To8Ptr = (u8 *) To32Ptr;

 	AlignBuffer = *From32Ptr++;
 	From8Ptr = (u8 *) & AlignBuffer;

 	for (i = 0; i < Length; i++) {
 		*To8Ptr++ = *From8Ptr++;
 	}
 }

 void XEmacLite_AlignedWrite (void *SrcPtr, u32 * DestPtr, unsigned ByteCount)
 {
 	unsigned i;
 	unsigned Length = ByteCount;
 	u32 AlignBuffer;
 	u32 *To32Ptr;
 	u32 *From32Ptr;
 	u8 *To8Ptr;
 	u8 *From8Ptr;
 	To32Ptr = DestPtr;

 	From32Ptr = (u32 *) SrcPtr;
 	while (Length > 3) {

 		*To32Ptr++ = *From32Ptr++;
 		Length -= 4;
 	}

 	AlignBuffer = 0;
 	To8Ptr = (u8 *) & AlignBuffer;
 	From8Ptr = (u8 *) From32Ptr;

 	for (i = 0; i < Length; i++) {
 		*To8Ptr++ = *From8Ptr++;
 	}

 	*To32Ptr++ = AlignBuffer;
 }

 void eth_halt (void)
 {
 #ifdef DEBUG
 	puts ("eth_halt\n");
 #endif
 }

 int eth_init (bd_t * bis)
 {
 #ifdef DEBUG
 	puts ("EmacLite Initialization Started\n");
 #endif
 	memset (&EmacLite, 0, sizeof (XEmacLite));
 	EmacLite.BaseAddress = XILINX_EMACLITE_BASEADDR;

 #ifdef CFG_ENV_IS_NOWHERE
 	memcpy (bis->bi_enetaddr, EMACAddr, ENET_ADDR_LENGTH);
 #endif
 /*
  * TX - TX_PING & TX_PONG initialization
  */
 	/* Restart PING TX */
 	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET, 0);
 	/* Copy MAC address */
 	XEmacLite_AlignedWrite (bis->bi_enetaddr,
 		EmacLite.BaseAddress, ENET_ADDR_LENGTH);
 	/* Set the length */
 	out_be32 (EmacLite.BaseAddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
 	/* Update the MAC address in the EMAC Lite */
 	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET, XEL_TSR_PROG_MAC_ADDR);
 	/* Wait for EMAC Lite to finish with the MAC address update */
 	while ((in_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET) &
 		XEL_TSR_PROG_MAC_ADDR) != 0) ;

 #ifdef XILINX_EMACLITE_TX_PING_PONG
 	/* The same operation with PONG TX */
 	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, 0);
 	XEmacLite_AlignedWrite (bis->bi_enetaddr,
 		EmacLite.BaseAddress + XEL_BUFFER_OFFSET, ENET_ADDR_LENGTH);
 	out_be32 (EmacLite.BaseAddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
 	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET,
 		XEL_TSR_PROG_MAC_ADDR);
 	while ((in_be32	(EmacLite.BaseAddress + XEL_TSR_OFFSET +
 		 XEL_BUFFER_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0) ;
 #endif

 /*
  * RX - RX_PING & RX_PONG initialization
  */
 	/* Write out the value to flush the RX buffer */
 	out_be32 (EmacLite.BaseAddress + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK);
 #ifdef XILINX_EMACLITE_RX_PING_PONG
 	out_be32 (EmacLite.BaseAddress + XEL_RSR_OFFSET + XEL_BUFFER_OFFSET,
 		XEL_RSR_RECV_IE_MASK);
 #endif

 #ifdef DEBUG
 	puts ("EmacLite Initialization complete\n");
 #endif
 	return 0;
 }

 int XEmacLite_TxBufferAvailable (XEmacLite * InstancePtr)
 {
 	u32 Register;
 	u32 TxPingBusy;
 	u32 TxPongBusy;
 	/*
 	 * Read the other buffer register
 	 * and determine if the other buffer is available
 	 */
 	Register = in_be32 (InstancePtr->BaseAddress +
 			InstancePtr->NextTxBufferToUse + 0);
 	TxPingBusy = ((Register & XEL_TSR_XMIT_BUSY_MASK) ==
 			XEL_TSR_XMIT_BUSY_MASK);

 	Register = in_be32 (InstancePtr->BaseAddress +
 			(InstancePtr->NextTxBufferToUse ^ XEL_TSR_OFFSET) + 0);
 	TxPongBusy = ((Register & XEL_TSR_XMIT_BUSY_MASK) ==
 			XEL_TSR_XMIT_BUSY_MASK);

 	return (!(TxPingBusy && TxPongBusy));
 }

 int eth_send (volatile void *ptr, int len) {

 	unsigned int Register;
 	unsigned int BaseAddress;

 	unsigned maxtry = 1000;

 	if (len > ENET_MAX_MTU)
 		len = ENET_MAX_MTU;

 	while (!XEmacLite_TxBufferAvailable (&EmacLite) && maxtry) {
 		udelay (10);
 		maxtry--;
 	}

 	if (!maxtry) {
 		printf ("Error: Timeout waiting for ethernet TX buffer\n");
 		/* Restart PING TX */
 		out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET, 0);
 #ifdef XILINX_EMACLITE_TX_PING_PONG
 		out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET +
 		XEL_BUFFER_OFFSET, 0);
 #endif
 		return 0;
 	}

 	/* Determine the expected TX buffer address */
 	BaseAddress = (EmacLite.BaseAddress + EmacLite.NextTxBufferToUse);

 	/* Determine if the expected buffer address is empty */
 	Register = in_be32 (BaseAddress + XEL_TSR_OFFSET);
 	if (((Register & XEL_TSR_XMIT_BUSY_MASK) == 0)
 		&& ((in_be32 ((BaseAddress) + XEL_TSR_OFFSET)
 			& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {

 #ifdef XILINX_EMACLITE_TX_PING_PONG
 		EmacLite.NextTxBufferToUse ^= XEL_BUFFER_OFFSET;
 #endif
 #ifdef DEBUG
 		printf ("Send packet from 0x%x\n", BaseAddress);
 #endif
 		/* Write the frame to the buffer */
 		XEmacLite_AlignedWrite (ptr, (u32 *) BaseAddress, len);
 		out_be32 (BaseAddress + XEL_TPLR_OFFSET,(len &
 			(XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO)));
 		Register = in_be32 (BaseAddress + XEL_TSR_OFFSET);
 		Register |= XEL_TSR_XMIT_BUSY_MASK;
 		if ((Register & XEL_TSR_XMIT_IE_MASK) != 0) {
 			Register |= XEL_TSR_XMIT_ACTIVE_MASK;
 		}
 		out_be32 (BaseAddress + XEL_TSR_OFFSET, Register);
 		return 1;
 	}
 #ifdef XILINX_EMACLITE_TX_PING_PONG
 	/* Switch to second buffer */
 	BaseAddress ^= XEL_BUFFER_OFFSET;
 	/* Determine if the expected buffer address is empty */
 	Register = in_be32 (BaseAddress + XEL_TSR_OFFSET);
 	if (((Register & XEL_TSR_XMIT_BUSY_MASK) == 0)
 		&& ((in_be32 ((BaseAddress) + XEL_TSR_OFFSET)
 			& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {
 #ifdef DEBUG
 		printf ("Send packet from 0x%x\n", BaseAddress);
 #endif
 		/* Write the frame to the buffer */
 		XEmacLite_AlignedWrite (ptr, (u32 *) BaseAddress, len);
 		out_be32 (BaseAddress + XEL_TPLR_OFFSET,(len &
 			(XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO)));
 		Register = in_be32 (BaseAddress + XEL_TSR_OFFSET);
 		Register |= XEL_TSR_XMIT_BUSY_MASK;
 		if ((Register & XEL_TSR_XMIT_IE_MASK) != 0) {
 			Register |= XEL_TSR_XMIT_ACTIVE_MASK;
 		}
 		out_be32 (BaseAddress + XEL_TSR_OFFSET, Register);
 		return 1;
 	}
 #endif
 	puts ("Error while sending frame\n");
 	return 0;
 }

 int eth_rx (void)
 {
 	unsigned int Length;
 	unsigned int Register;
 	unsigned int BaseAddress;

 	BaseAddress = EmacLite.BaseAddress + EmacLite.NextRxBufferToUse;
 	Register = in_be32 (BaseAddress + XEL_RSR_OFFSET);
 #ifdef DEBUG
 	printf ("Testing data at address 0x%x\n", BaseAddress);
 #endif
 	if ((Register & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
 #ifdef XILINX_EMACLITE_RX_PING_PONG
 		EmacLite.NextRxBufferToUse ^= XEL_BUFFER_OFFSET;
 #endif
 	} else {
 #ifndef XILINX_EMACLITE_RX_PING_PONG
 #ifdef DEBUG
 		printf ("No data was available - address 0x%x\n", BaseAddress);
 #endif
 		return 0;
 #else
 		BaseAddress ^= XEL_BUFFER_OFFSET;
 		Register = in_be32 (BaseAddress + XEL_RSR_OFFSET);
 		if ((Register & XEL_RSR_RECV_DONE_MASK) !=
 					XEL_RSR_RECV_DONE_MASK) {
 #ifdef DEBUG
 			printf ("No data was available - address 0x%x\n",
 					BaseAddress);
 #endif
 			return 0;
 		}
 #endif
 	}
 	/* Get the length of the frame that arrived */
 	switch(((in_be32(BaseAddress + XEL_RXBUFF_OFFSET + 0xC)) &
 			0xFFFF0000 ) >> 16) {
 		case 0x806:
 			Length = 42 + 20; /* FIXME size of ARP */
 #ifdef DEBUG
 			puts ("ARP Packet\n");
 #endif
 			break;
 		case 0x800:
 			Length = 14 + 14 +
 			(((in_be32(BaseAddress + XEL_RXBUFF_OFFSET + 0x10)) &
 			0xFFFF0000) >> 16); /* FIXME size of IP packet */
 #ifdef DEBUG
 			puts("IP Packet\n");
 #endif
 			break;
 		default:
 #ifdef DEBUG
 			puts("Other Packet\n");
 #endif
 			Length = ENET_MAX_MTU;
 			break;
 	}

 	XEmacLite_AlignedRead ((BaseAddress + XEL_RXBUFF_OFFSET),
 			etherrxbuff, Length);

 	/* Acknowledge the frame */
 	Register = in_be32 (BaseAddress + XEL_RSR_OFFSET);
 	Register &= ~XEL_RSR_RECV_DONE_MASK;
 	out_be32 (BaseAddress + XEL_RSR_OFFSET, Register);

 #ifdef DEBUG
 	printf ("Packet receive from 0x%x, length %dB\n", BaseAddress, Length);
 #endif
 	NetReceive ((uchar *) etherrxbuff, Length);
 	return 1;

 }
 #endif
	/*
	* (C) Copyright 2007 Michal Simek
	*
	* Michal SIMEK <monstr@monstr.eu>
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* 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., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	#include <common.h>
	#include <net.h>
	#include <config.h>
	#include <asm/io.h>

	#ifdef XILINX_EMACLITE_BASEADDR

	#undef DEBUG

	#define ENET_MAX_MTU PKTSIZE
	#define ENET_MAX_MTU_ALIGNED PKTSIZE_ALIGN
	#define ENET_ADDR_LENGTH 6

	/* EmacLite constants */
	#define XEL_BUFFER_OFFSET 0x0800 /* Next buffer's offset */
	#define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
	#define XEL_TSR_OFFSET 0x07FC /* Tx status */
	#define XEL_RSR_OFFSET 0x17FC /* Rx status */
	#define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */

	/* Xmit complete */
	#define XEL_TSR_XMIT_BUSY_MASK 0x00000001UL
	/* Xmit interrupt enable bit */
	#define XEL_TSR_XMIT_IE_MASK 0x00000008UL
	/* Buffer is active, SW bit only */
	#define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000UL
	/* Program the MAC address */
	#define XEL_TSR_PROGRAM_MASK 0x00000002UL
	/* define for programming the MAC address into the EMAC Lite */
	#define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK \| XEL_TSR_PROGRAM_MASK)

	/* Transmit packet length upper byte */
	#define XEL_TPLR_LENGTH_MASK_HI 0x0000FF00UL
	/* Transmit packet length lower byte */
	#define XEL_TPLR_LENGTH_MASK_LO 0x000000FFUL

	/* Recv complete */
	#define XEL_RSR_RECV_DONE_MASK 0x00000001UL
	/* Recv interrupt enable bit */
	#define XEL_RSR_RECV_IE_MASK 0x00000008UL

	typedef struct {
	unsigned int BaseAddress; /* Base address for device (IPIF) */
	unsigned int NextTxBufferToUse; /* Next TX buffer to write to */
	unsigned int NextRxBufferToUse; /* Next RX buffer to read from */
	unsigned char DeviceId; /* Unique ID of device - for future */
	} XEmacLite;

	static XEmacLite EmacLite;

	static char etherrxbuff[PKTSIZE_ALIGN]; /* Receive buffer */

	/* hardcoded MAC address for the Xilinx EMAC Core when env is nowhere*/
	#ifdef CFG_ENV_IS_NOWHERE
	static u8 EMACAddr[ENET_ADDR_LENGTH] = { 0x00, 0x0a, 0x35, 0x00, 0x22, 0x01 };
	#endif

	void XEmacLite_AlignedRead (u32 * SrcPtr, void *DestPtr, unsigned ByteCount)
	{
	unsigned i;
	unsigned Length = ByteCount;
	u32 AlignBuffer;
	u32 *To32Ptr;
	u32 *From32Ptr;
	u8 *To8Ptr;
	u8 *From8Ptr;

	From32Ptr = (u32 *) SrcPtr;

	/* Word aligned buffer, no correction needed. */
	To32Ptr = (u32 *) DestPtr;
	while (Length > 3) {
	To32Ptr++ = From32Ptr++;
	Length -= 4;
	}
	To8Ptr = (u8 *) To32Ptr;

	AlignBuffer = *From32Ptr++;
	From8Ptr = (u8 *) & AlignBuffer;

	for (i = 0; i < Length; i++) {
	To8Ptr++ = From8Ptr++;
	}
	}

	void XEmacLite_AlignedWrite (void SrcPtr, u32 DestPtr, unsigned ByteCount)
	{
	unsigned i;
	unsigned Length = ByteCount;
	u32 AlignBuffer;
	u32 *To32Ptr;
	u32 *From32Ptr;
	u8 *To8Ptr;
	u8 *From8Ptr;
	To32Ptr = DestPtr;

	From32Ptr = (u32 *) SrcPtr;
	while (Length > 3) {

	To32Ptr++ = From32Ptr++;
	Length -= 4;
	}

	AlignBuffer = 0;
	To8Ptr = (u8 *) & AlignBuffer;
	From8Ptr = (u8 *) From32Ptr;

	for (i = 0; i < Length; i++) {
	To8Ptr++ = From8Ptr++;
	}

	*To32Ptr++ = AlignBuffer;
	}

	void eth_halt (void)
	{
	#ifdef DEBUG
	puts ("eth_halt\n");
	#endif
	}

	int eth_init (bd_t * bis)
	{
	#ifdef DEBUG
	puts ("EmacLite Initialization Started\n");
	#endif
	memset (&EmacLite, 0, sizeof (XEmacLite));
	EmacLite.BaseAddress = XILINX_EMACLITE_BASEADDR;

	#ifdef CFG_ENV_IS_NOWHERE
	memcpy (bis->bi_enetaddr, EMACAddr, ENET_ADDR_LENGTH);
	#endif
	/*
	* TX - TX_PING & TX_PONG initialization
	*/
	/* Restart PING TX */
	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET, 0);
	/* Copy MAC address */
	XEmacLite_AlignedWrite (bis->bi_enetaddr,
	EmacLite.BaseAddress, ENET_ADDR_LENGTH);
	/* Set the length */
	out_be32 (EmacLite.BaseAddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
	/* Update the MAC address in the EMAC Lite */
	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET, XEL_TSR_PROG_MAC_ADDR);
	/* Wait for EMAC Lite to finish with the MAC address update */
	while ((in_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET) &
	XEL_TSR_PROG_MAC_ADDR) != 0) ;

	#ifdef XILINX_EMACLITE_TX_PING_PONG
	/* The same operation with PONG TX */
	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, 0);
	XEmacLite_AlignedWrite (bis->bi_enetaddr,
	EmacLite.BaseAddress + XEL_BUFFER_OFFSET, ENET_ADDR_LENGTH);
	out_be32 (EmacLite.BaseAddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET,
	XEL_TSR_PROG_MAC_ADDR);
	while ((in_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET +
	XEL_BUFFER_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0) ;
	#endif

	/*
	* RX - RX_PING & RX_PONG initialization
	*/
	/* Write out the value to flush the RX buffer */
	out_be32 (EmacLite.BaseAddress + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK);
	#ifdef XILINX_EMACLITE_RX_PING_PONG
	out_be32 (EmacLite.BaseAddress + XEL_RSR_OFFSET + XEL_BUFFER_OFFSET,
	XEL_RSR_RECV_IE_MASK);
	#endif

	#ifdef DEBUG
	puts ("EmacLite Initialization complete\n");
	#endif
	return 0;
	}

	int XEmacLite_TxBufferAvailable (XEmacLite * InstancePtr)
	{
	u32 Register;
	u32 TxPingBusy;
	u32 TxPongBusy;
	/*
	* Read the other buffer register
	* and determine if the other buffer is available
	*/
	Register = in_be32 (InstancePtr->BaseAddress +
	InstancePtr->NextTxBufferToUse + 0);
	TxPingBusy = ((Register & XEL_TSR_XMIT_BUSY_MASK) ==
	XEL_TSR_XMIT_BUSY_MASK);

	Register = in_be32 (InstancePtr->BaseAddress +
	(InstancePtr->NextTxBufferToUse ^ XEL_TSR_OFFSET) + 0);
	TxPongBusy = ((Register & XEL_TSR_XMIT_BUSY_MASK) ==
	XEL_TSR_XMIT_BUSY_MASK);

	return (!(TxPingBusy && TxPongBusy));
	}

	int eth_send (volatile void *ptr, int len) {

	unsigned int Register;
	unsigned int BaseAddress;

	unsigned maxtry = 1000;

	if (len > ENET_MAX_MTU)
	len = ENET_MAX_MTU;

	while (!XEmacLite_TxBufferAvailable (&EmacLite) && maxtry) {
	udelay (10);
	maxtry--;
	}

	if (!maxtry) {
	printf ("Error: Timeout waiting for ethernet TX buffer\n");
	/* Restart PING TX */
	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET, 0);
	#ifdef XILINX_EMACLITE_TX_PING_PONG
	out_be32 (EmacLite.BaseAddress + XEL_TSR_OFFSET +
	XEL_BUFFER_OFFSET, 0);
	#endif
	return 0;
	}

	/* Determine the expected TX buffer address */
	BaseAddress = (EmacLite.BaseAddress + EmacLite.NextTxBufferToUse);

	/* Determine if the expected buffer address is empty */
	Register = in_be32 (BaseAddress + XEL_TSR_OFFSET);
	if (((Register & XEL_TSR_XMIT_BUSY_MASK) == 0)
	&& ((in_be32 ((BaseAddress) + XEL_TSR_OFFSET)
	& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {

	#ifdef XILINX_EMACLITE_TX_PING_PONG
	EmacLite.NextTxBufferToUse ^= XEL_BUFFER_OFFSET;
	#endif
	#ifdef DEBUG
	printf ("Send packet from 0x%x\n", BaseAddress);
	#endif
	/* Write the frame to the buffer */
	XEmacLite_AlignedWrite (ptr, (u32 *) BaseAddress, len);
	out_be32 (BaseAddress + XEL_TPLR_OFFSET,(len &
	(XEL_TPLR_LENGTH_MASK_HI \| XEL_TPLR_LENGTH_MASK_LO)));
	Register = in_be32 (BaseAddress + XEL_TSR_OFFSET);
	Register \|= XEL_TSR_XMIT_BUSY_MASK;
	if ((Register & XEL_TSR_XMIT_IE_MASK) != 0) {
	Register \|= XEL_TSR_XMIT_ACTIVE_MASK;
	}
	out_be32 (BaseAddress + XEL_TSR_OFFSET, Register);
	return 1;
	}
	#ifdef XILINX_EMACLITE_TX_PING_PONG
	/* Switch to second buffer */
	BaseAddress ^= XEL_BUFFER_OFFSET;
	/* Determine if the expected buffer address is empty */
	Register = in_be32 (BaseAddress + XEL_TSR_OFFSET);
	if (((Register & XEL_TSR_XMIT_BUSY_MASK) == 0)
	&& ((in_be32 ((BaseAddress) + XEL_TSR_OFFSET)
	& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {
	#ifdef DEBUG
	printf ("Send packet from 0x%x\n", BaseAddress);
	#endif
	/* Write the frame to the buffer */
	XEmacLite_AlignedWrite (ptr, (u32 *) BaseAddress, len);
	out_be32 (BaseAddress + XEL_TPLR_OFFSET,(len &
	(XEL_TPLR_LENGTH_MASK_HI \| XEL_TPLR_LENGTH_MASK_LO)));
	Register = in_be32 (BaseAddress + XEL_TSR_OFFSET);
	Register \|= XEL_TSR_XMIT_BUSY_MASK;
	if ((Register & XEL_TSR_XMIT_IE_MASK) != 0) {
	Register \|= XEL_TSR_XMIT_ACTIVE_MASK;
	}
	out_be32 (BaseAddress + XEL_TSR_OFFSET, Register);
	return 1;
	}
	#endif
	puts ("Error while sending frame\n");
	return 0;
	}

	int eth_rx (void)
	{
	unsigned int Length;
	unsigned int Register;
	unsigned int BaseAddress;

	BaseAddress = EmacLite.BaseAddress + EmacLite.NextRxBufferToUse;
	Register = in_be32 (BaseAddress + XEL_RSR_OFFSET);
	#ifdef DEBUG
	printf ("Testing data at address 0x%x\n", BaseAddress);
	#endif
	if ((Register & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
	#ifdef XILINX_EMACLITE_RX_PING_PONG
	EmacLite.NextRxBufferToUse ^= XEL_BUFFER_OFFSET;
	#endif
	} else {
	#ifndef XILINX_EMACLITE_RX_PING_PONG
	#ifdef DEBUG
	printf ("No data was available - address 0x%x\n", BaseAddress);
	#endif
	return 0;
	#else
	BaseAddress ^= XEL_BUFFER_OFFSET;
	Register = in_be32 (BaseAddress + XEL_RSR_OFFSET);
	if ((Register & XEL_RSR_RECV_DONE_MASK) !=
	XEL_RSR_RECV_DONE_MASK) {
	#ifdef DEBUG
	printf ("No data was available - address 0x%x\n",
	BaseAddress);
	#endif
	return 0;
	}
	#endif
	}
	/* Get the length of the frame that arrived */
	switch(((in_be32(BaseAddress + XEL_RXBUFF_OFFSET + 0xC)) &
	0xFFFF0000 ) >> 16) {
	case 0x806:
	Length = 42 + 20; /* FIXME size of ARP */
	#ifdef DEBUG
	puts ("ARP Packet\n");
	#endif
	break;
	case 0x800:
	Length = 14 + 14 +
	(((in_be32(BaseAddress + XEL_RXBUFF_OFFSET + 0x10)) &
	0xFFFF0000) >> 16); /* FIXME size of IP packet */
	#ifdef DEBUG
	puts("IP Packet\n");
	#endif
	break;
	default:
	#ifdef DEBUG
	puts("Other Packet\n");
	#endif
	Length = ENET_MAX_MTU;
	break;
	}

	XEmacLite_AlignedRead ((BaseAddress + XEL_RXBUFF_OFFSET),
	etherrxbuff, Length);

	/* Acknowledge the frame */
	Register = in_be32 (BaseAddress + XEL_RSR_OFFSET);
	Register &= ~XEL_RSR_RECV_DONE_MASK;
	out_be32 (BaseAddress + XEL_RSR_OFFSET, Register);

	#ifdef DEBUG
	printf ("Packet receive from 0x%x, length %dB\n", BaseAddress, Length);
	#endif
	NetReceive ((uchar *) etherrxbuff, Length);
	return 1;

	}
	#endif