net: ne2000: Divided a function of NE2000 driver

get_prom function was used __attriute__ , but it is not enable.
ax88796.o does not do link besides ne2000.o. When ld is carried
out, get_prom function of ax88796.c is ignored.
This problem is a thing by specifications of ld.
I checked and test this patch on SuperH and MIPS.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

1 files changed, 757 insertions, 0 deletions

diff --git a/drivers/net/ne2000_base.c b/drivers/net/ne2000_base.c
new file mode 100644
index 0000000..4a07708
--- /dev/null
+++ b/drivers/net/ne2000_base.c
@@ -0,0 +1,757 @@
+/*
+Ported to U-Boot by Christian Pellegrin <chri@ascensit.com>
+
+Based on sources from the Linux kernel (pcnet_cs.c, 8390.h) and
+eCOS(if_dp83902a.c, if_dp83902a.h). Both of these 2 wonderful world
+are GPL, so this is, of course, GPL.
+
+==========================================================================
+
+dev/if_dp83902a.c
+
+Ethernet device driver for NS DP83902a ethernet controller
+
+==========================================================================
+####ECOSGPLCOPYRIGHTBEGIN####
+-------------------------------------------
+This file is part of eCos, the Embedded Configurable Operating System.
+Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
+
+eCos 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 or (at your option) any later version.
+
+eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
+59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+
+As a special exception, if other files instantiate templates or use macros
+or inline functions from this file, or you compile this file and link it
+with other works to produce a work based on this file, this file does not
+by itself cause the resulting work to be covered by the GNU General Public
+License. However the source code for this file must still be made available
+in accordance with section (3) of the GNU General Public License.
+
+This exception does not invalidate any other reasons why a work based on
+this file might be covered by the GNU General Public License.
+
+Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
+at http://sources.redhat.com/ecos/ecos-license/
+-------------------------------------------
+####ECOSGPLCOPYRIGHTEND####
+####BSDCOPYRIGHTBEGIN####
+
+-------------------------------------------
+
+Portions of this software may have been derived from OpenBSD or other sources,
+and are covered by the appropriate copyright disclaimers included herein.
+
+-------------------------------------------
+
+####BSDCOPYRIGHTEND####
+==========================================================================
+#####DESCRIPTIONBEGIN####
+
+Author(s):	gthomas
+Contributors:	gthomas, jskov, rsandifo
+Date:		2001-06-13
+Purpose:
+Description:
+
+FIXME:		Will fail if pinged with large packets (1520 bytes)
+Add promisc config
+Add SNMP
+
+####DESCRIPTIONEND####
+
+==========================================================================
+*/
+
+#include <common.h>
+#include <command.h>
+#include <net.h>
+#include <malloc.h>
+
+#define mdelay(n)	udelay((n)*1000)
+/* forward definition of function used for the uboot interface */
+void uboot_push_packet_len(int len);
+void uboot_push_tx_done(int key, int val);
+
+/* NE2000 base header file */
+#include "ne2000_base.h"
+
+#if defined(CONFIG_DRIVER_AX88796L)
+/* AX88796L support */
+#include "ax88796.h"
+#else
+/* Basic NE2000 chip support */
+#include "ne2000.h"
+#endif
+
+static dp83902a_priv_data_t nic; /* just one instance of the card supported */
+
+static bool
+dp83902a_init(void)
+{
+	dp83902a_priv_data_t *dp = &nic;
+	u8* base;
+#if defined(NE2000_BASIC_INIT)
+	int i;
+#endif
+
+	DEBUG_FUNCTION();
+
+	base = dp->base;
+	if (!base)
+		return false;	/* No device found */
+
+	DEBUG_LINE();
+
+#if defined(NE2000_BASIC_INIT)
+	/* AX88796L doesn't need */
+	/* Prepare ESA */
+	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE1);	/* Select page 1 */
+	/* Use the address from the serial EEPROM */
+	for (i = 0; i < 6; i++)
+		DP_IN(base, DP_P1_PAR0+i, dp->esa[i]);
+	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE0);	/* Select page 0 */
+
+	printf("NE2000 - %s ESA: %02x:%02x:%02x:%02x:%02x:%02x\n",
+		"eeprom",
+		dp->esa[0],
+		dp->esa[1],
+		dp->esa[2],
+		dp->esa[3],
+		dp->esa[4],
+		dp->esa[5] );
+
+#endif	/* NE2000_BASIC_INIT */
+	return true;
+}
+
+static void
+dp83902a_stop(void)
+{
+	dp83902a_priv_data_t *dp = &nic;
+	u8 *base = dp->base;
+
+	DEBUG_FUNCTION();
+
+	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_STOP);	/* Brutal */
+	DP_OUT(base, DP_ISR, 0xFF);		/* Clear any pending interrupts */
+	DP_OUT(base, DP_IMR, 0x00);		/* Disable all interrupts */
+
+	dp->running = false;
+}
+
+/*
+ * This function is called to "start up" the interface. It may be called
+ * multiple times, even when the hardware is already running. It will be
+ * called whenever something "hardware oriented" changes and should leave
+ * the hardware ready to send/receive packets.
+ */
+static void
+dp83902a_start(u8 * enaddr)
+{
+	dp83902a_priv_data_t *dp = &nic;
+	u8 *base = dp->base;
+	int i;
+
+	DEBUG_FUNCTION();
+
+	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_STOP); /* Brutal */
+	DP_OUT(base, DP_DCR, DP_DCR_INIT);
+	DP_OUT(base, DP_RBCH, 0);		/* Remote byte count */
+	DP_OUT(base, DP_RBCL, 0);
+	DP_OUT(base, DP_RCR, DP_RCR_MON);	/* Accept no packets */
+	DP_OUT(base, DP_TCR, DP_TCR_LOCAL);	/* Transmitter [virtually] off */
+	DP_OUT(base, DP_TPSR, dp->tx_buf1);	/* Transmitter start page */
+	dp->tx1 = dp->tx2 = 0;
+	dp->tx_next = dp->tx_buf1;
+	dp->tx_started = false;
+	dp->running = true;
+	DP_OUT(base, DP_PSTART, dp->rx_buf_start); /* Receive ring start page */
+	DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1); /* Receive ring boundary */
+	DP_OUT(base, DP_PSTOP, dp->rx_buf_end);	/* Receive ring end page */
+	dp->rx_next = dp->rx_buf_start - 1;
+	dp->running = true;
+	DP_OUT(base, DP_ISR, 0xFF);		/* Clear any pending interrupts */
+	DP_OUT(base, DP_IMR, DP_IMR_All);	/* Enable all interrupts */
+	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE1 | DP_CR_STOP);	/* Select page 1 */
+	DP_OUT(base, DP_P1_CURP, dp->rx_buf_start);	/* Current page - next free page for Rx */
+	dp->running = true;
+	for (i = 0; i < ETHER_ADDR_LEN; i++) {
+		/* FIXME */
+		/*((vu_short*)( base + ((DP_P1_PAR0 + i) * 2) +
+		 * 0x1400)) = enaddr[i];*/
+		DP_OUT(base, DP_P1_PAR0+i, enaddr[i]);
+	}
+	/* Enable and start device */
+	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
+	DP_OUT(base, DP_TCR, DP_TCR_NORMAL); /* Normal transmit operations */
+	DP_OUT(base, DP_RCR, DP_RCR_AB); /* Accept broadcast, no errors, no multicast */
+	dp->running = true;
+}
+
+/*
+ * This routine is called to start the transmitter. It is split out from the
+ * data handling routine so it may be called either when data becomes first
+ * available or when an Tx interrupt occurs
+ */
+
+static void
+dp83902a_start_xmit(int start_page, int len)
+{
+	dp83902a_priv_data_t *dp = (dp83902a_priv_data_t *) &nic;
+	u8 *base = dp->base;
+
+	DEBUG_FUNCTION();
+
+#if DEBUG & 1
+	printf("Tx pkt %d len %d\n", start_page, len);
+	if (dp->tx_started)
+		printf("TX already started?!?\n");
+#endif
+
+	DP_OUT(base, DP_ISR, (DP_ISR_TxP | DP_ISR_TxE));
+	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
+	DP_OUT(base, DP_TBCL, len & 0xFF);
+	DP_OUT(base, DP_TBCH, len >> 8);
+	DP_OUT(base, DP_TPSR, start_page);
+	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_TXPKT | DP_CR_START);
+
+	dp->tx_started = true;
+}
+
+/*
+ * This routine is called to send data to the hardware. It is known a-priori
+ * that there is free buffer space (dp->tx_next).
+ */
+static void
+dp83902a_send(u8 *data, int total_len, u32 key)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
+	u8 *base = dp->base;
+	int len, start_page, pkt_len, i, isr;
+#if DEBUG & 4
+	int dx;
+#endif
+
+	DEBUG_FUNCTION();
+
+	len = pkt_len = total_len;
+	if (pkt_len < IEEE_8023_MIN_FRAME)
+		pkt_len = IEEE_8023_MIN_FRAME;
+
+	start_page = dp->tx_next;
+	if (dp->tx_next == dp->tx_buf1) {
+		dp->tx1 = start_page;
+		dp->tx1_len = pkt_len;
+		dp->tx1_key = key;
+		dp->tx_next = dp->tx_buf2;
+	} else {
+		dp->tx2 = start_page;
+		dp->tx2_len = pkt_len;
+		dp->tx2_key = key;
+		dp->tx_next = dp->tx_buf1;
+	}
+
+#if DEBUG & 5
+	printf("TX prep page %d len %d\n", start_page, pkt_len);
+#endif
+
+	DP_OUT(base, DP_ISR, DP_ISR_RDC);	/* Clear end of DMA */
+	{
+		/*
+		 * Dummy read. The manual sez something slightly different,
+		 * but the code is extended a bit to do what Hitachi's monitor
+		 * does (i.e., also read data).
+		 */
+
+		u16 tmp;
+		int len = 1;
+
+		DP_OUT(base, DP_RSAL, 0x100 - len);
+		DP_OUT(base, DP_RSAH, (start_page - 1) & 0xff);
+		DP_OUT(base, DP_RBCL, len);
+		DP_OUT(base, DP_RBCH, 0);
+		DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_RDMA | DP_CR_START);
+		DP_IN_DATA(dp->data, tmp);
+	}
+
+#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA
+	/*
+	 * Stall for a bit before continuing to work around random data
+	 * corruption problems on some platforms.
+	 */
+	CYGACC_CALL_IF_DELAY_US(1);
+#endif
+
+	/* Send data to device buffer(s) */
+	DP_OUT(base, DP_RSAL, 0);
+	DP_OUT(base, DP_RSAH, start_page);
+	DP_OUT(base, DP_RBCL, pkt_len & 0xFF);
+	DP_OUT(base, DP_RBCH, pkt_len >> 8);
+	DP_OUT(base, DP_CR, DP_CR_WDMA | DP_CR_START);
+
+	/* Put data into buffer */
+#if DEBUG & 4
+	printf(" sg buf %08lx len %08x\n ", (u32)data, len);
+	dx = 0;
+#endif
+	while (len > 0) {
+#if DEBUG & 4
+		printf(" %02x", *data);
+		if (0 == (++dx % 16)) printf("\n ");
+#endif
+
+		DP_OUT_DATA(dp->data, *data++);
+		len--;
+	}
+#if DEBUG & 4
+	printf("\n");
+#endif
+	if (total_len < pkt_len) {
+#if DEBUG & 4
+		printf("  + %d bytes of padding\n", pkt_len - total_len);
+#endif
+		/* Padding to 802.3 length was required */
+		for (i = total_len; i < pkt_len;) {
+			i++;
+			DP_OUT_DATA(dp->data, 0);
+		}
+	}
+
+#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA
+	/*
+	 * After last data write, delay for a bit before accessing the
+	 * device again, or we may get random data corruption in the last
+	 * datum (on some platforms).
+	 */
+	CYGACC_CALL_IF_DELAY_US(1);
+#endif
+
+	/* Wait for DMA to complete */
+	do {
+		DP_IN(base, DP_ISR, isr);
+	} while ((isr & DP_ISR_RDC) == 0);
+
+	/* Then disable DMA */
+	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
+
+	/* Start transmit if not already going */
+	if (!dp->tx_started) {
+		if (start_page == dp->tx1) {
+			dp->tx_int = 1; /* Expecting interrupt from BUF1 */
+		} else {
+			dp->tx_int = 2; /* Expecting interrupt from BUF2 */
+		}
+		dp83902a_start_xmit(start_page, pkt_len);
+	}
+}
+
+/*
+ * This function is called when a packet has been received. It's job is
+ * to prepare to unload the packet from the hardware. Once the length of
+ * the packet is known, the upper layer of the driver can be told. When
+ * the upper layer is ready to unload the packet, the internal function
+ * 'dp83902a_recv' will be called to actually fetch it from the hardware.
+ */
+static void
+dp83902a_RxEvent(void)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
+	u8 *base = dp->base;
+	u8 rsr;
+	u8 rcv_hdr[4];
+	int i, len, pkt, cur;
+
+	DEBUG_FUNCTION();
+
+	DP_IN(base, DP_RSR, rsr);
+	while (true) {
+		/* Read incoming packet header */
+		DP_OUT(base, DP_CR, DP_CR_PAGE1 | DP_CR_NODMA | DP_CR_START);
+		DP_IN(base, DP_P1_CURP, cur);
+		DP_OUT(base, DP_P1_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
+		DP_IN(base, DP_BNDRY, pkt);
+
+		pkt += 1;
+		if (pkt == dp->rx_buf_end)
+			pkt = dp->rx_buf_start;
+
+		if (pkt == cur) {
+			break;
+		}
+		DP_OUT(base, DP_RBCL, sizeof(rcv_hdr));
+		DP_OUT(base, DP_RBCH, 0);
+		DP_OUT(base, DP_RSAL, 0);
+		DP_OUT(base, DP_RSAH, pkt);
+		if (dp->rx_next == pkt) {
+			if (cur == dp->rx_buf_start)
+				DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1);
+			else
+				DP_OUT(base, DP_BNDRY, cur - 1); /* Update pointer */
+			return;
+		}
+		dp->rx_next = pkt;
+		DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */
+		DP_OUT(base, DP_CR, DP_CR_RDMA | DP_CR_START);
+#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_RX_DMA
+		CYGACC_CALL_IF_DELAY_US(10);
+#endif
+
+		/* read header (get data size)*/
+		for (i = 0; i < sizeof(rcv_hdr);) {
+			DP_IN_DATA(dp->data, rcv_hdr[i++]);
+		}
+
+#if DEBUG & 5
+		printf("rx hdr %02x %02x %02x %02x\n",
+			rcv_hdr[0], rcv_hdr[1], rcv_hdr[2], rcv_hdr[3]);
+#endif
+		len = ((rcv_hdr[3] << 8) | rcv_hdr[2]) - sizeof(rcv_hdr);
+
+		/* data read */
+		uboot_push_packet_len(len);
+
+		if (rcv_hdr[1] == dp->rx_buf_start)
+			DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1);
+		else
+			DP_OUT(base, DP_BNDRY, rcv_hdr[1] - 1); /* Update pointer */
+	}
+}
+
+/*
+ * This function is called as a result of the "eth_drv_recv()" call above.
+ * It's job is to actually fetch data for a packet from the hardware once
+ * memory buffers have been allocated for the packet. Note that the buffers
+ * may come in pieces, using a scatter-gather list. This allows for more
+ * efficient processing in the upper layers of the stack.
+ */
+static void
+dp83902a_recv(u8 *data, int len)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
+	u8 *base = dp->base;
+	int i, mlen;
+	u8 saved_char = 0;
+	bool saved;
+#if DEBUG & 4
+	int dx;
+#endif
+
+	DEBUG_FUNCTION();
+
+#if DEBUG & 5
+	printf("Rx packet %d length %d\n", dp->rx_next, len);
+#endif
+
+	/* Read incoming packet data */
+	DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
+	DP_OUT(base, DP_RBCL, len & 0xFF);
+	DP_OUT(base, DP_RBCH, len >> 8);
+	DP_OUT(base, DP_RSAL, 4);		/* Past header */
+	DP_OUT(base, DP_RSAH, dp->rx_next);
+	DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */
+	DP_OUT(base, DP_CR, DP_CR_RDMA | DP_CR_START);
+#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_RX_DMA
+	CYGACC_CALL_IF_DELAY_US(10);
+#endif
+
+	saved = false;
+	for (i = 0; i < 1; i++) {
+		if (data) {
+			mlen = len;
+#if DEBUG & 4
+			printf(" sg buf %08lx len %08x \n", (u32) data, mlen);
+			dx = 0;
+#endif
+			while (0 < mlen) {
+				/* Saved byte from previous loop? */
+				if (saved) {
+					*data++ = saved_char;
+					mlen--;
+					saved = false;
+					continue;
+				}
+
+				{
+					u8 tmp;
+					DP_IN_DATA(dp->data, tmp);
+#if DEBUG & 4
+					printf(" %02x", tmp);
+					if (0 == (++dx % 16)) printf("\n ");
+#endif
+					*data++ = tmp;;
+					mlen--;
+				}
+			}
+#if DEBUG & 4
+			printf("\n");
+#endif
+		}
+	}
+}
+
+static void
+dp83902a_TxEvent(void)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
+	u8 *base = dp->base;
+	u8 tsr;
+	u32 key;
+
+	DEBUG_FUNCTION();
+
+	DP_IN(base, DP_TSR, tsr);
+	if (dp->tx_int == 1) {
+		key = dp->tx1_key;
+		dp->tx1 = 0;
+	} else {
+		key = dp->tx2_key;
+		dp->tx2 = 0;
+	}
+	/* Start next packet if one is ready */
+	dp->tx_started = false;
+	if (dp->tx1) {
+		dp83902a_start_xmit(dp->tx1, dp->tx1_len);
+		dp->tx_int = 1;
+	} else if (dp->tx2) {
+		dp83902a_start_xmit(dp->tx2, dp->tx2_len);
+		dp->tx_int = 2;
+	} else {
+		dp->tx_int = 0;
+	}
+	/* Tell higher level we sent this packet */
+	uboot_push_tx_done(key, 0);
+}
+
+/*
+ * Read the tally counters to clear them. Called in response to a CNT
+ * interrupt.
+ */
+static void
+dp83902a_ClearCounters(void)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
+	u8 *base = dp->base;
+	u8 cnt1, cnt2, cnt3;
+
+	DP_IN(base, DP_FER, cnt1);
+	DP_IN(base, DP_CER, cnt2);
+	DP_IN(base, DP_MISSED, cnt3);
+	DP_OUT(base, DP_ISR, DP_ISR_CNT);
+}
+
+/*
+ * Deal with an overflow condition. This code follows the procedure set
+ * out in section 7.0 of the datasheet.
+ */
+static void
+dp83902a_Overflow(void)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *)&nic;
+	u8 *base = dp->base;
+	u8 isr;
+
+	/* Issue a stop command and wait 1.6ms for it to complete. */
+	DP_OUT(base, DP_CR, DP_CR_STOP | DP_CR_NODMA);
+	CYGACC_CALL_IF_DELAY_US(1600);
+
+	/* Clear the remote byte counter registers. */
+	DP_OUT(base, DP_RBCL, 0);
+	DP_OUT(base, DP_RBCH, 0);
+
+	/* Enter loopback mode while we clear the buffer. */
+	DP_OUT(base, DP_TCR, DP_TCR_LOCAL);
+	DP_OUT(base, DP_CR, DP_CR_START | DP_CR_NODMA);
+
+	/*
+	 * Read in as many packets as we can and acknowledge any and receive
+	 * interrupts. Since the buffer has overflowed, a receive event of
+	 * some kind will have occured.
+	 */
+	dp83902a_RxEvent();
+	DP_OUT(base, DP_ISR, DP_ISR_RxP|DP_ISR_RxE);
+
+	/* Clear the overflow condition and leave loopback mode. */
+	DP_OUT(base, DP_ISR, DP_ISR_OFLW);
+	DP_OUT(base, DP_TCR, DP_TCR_NORMAL);
+
+	/*
+	 * If a transmit command was issued, but no transmit event has occured,
+	 * restart it here.
+	 */
+	DP_IN(base, DP_ISR, isr);
+	if (dp->tx_started && !(isr & (DP_ISR_TxP|DP_ISR_TxE))) {
+		DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_TXPKT | DP_CR_START);
+	}
+}
+
+static void
+dp83902a_poll(void)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
+	u8 *base = dp->base;
+	u8 isr;
+
+	DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE0 | DP_CR_START);
+	DP_IN(base, DP_ISR, isr);
+	while (0 != isr) {
+		/*
+		 * The CNT interrupt triggers when the MSB of one of the error
+		 * counters is set. We don't much care about these counters, but
+		 * we should read their values to reset them.
+		 */
+		if (isr & DP_ISR_CNT) {
+			dp83902a_ClearCounters();
+		}
+		/*
+		 * Check for overflow. It's a special case, since there's a
+		 * particular procedure that must be followed to get back into
+		 * a running state.a
+		 */
+		if (isr & DP_ISR_OFLW) {
+			dp83902a_Overflow();
+		} else {
+			/*
+			 * Other kinds of interrupts can be acknowledged simply by
+			 * clearing the relevant bits of the ISR. Do that now, then
+			 * handle the interrupts we care about.
+			 */
+			DP_OUT(base, DP_ISR, isr);	/* Clear set bits */
+			if (!dp->running) break;	/* Is this necessary? */
+			/*
+			 * Check for tx_started on TX event since these may happen
+			 * spuriously it seems.
+			 */
+			if (isr & (DP_ISR_TxP|DP_ISR_TxE) && dp->tx_started) {
+				dp83902a_TxEvent();
+			}
+			if (isr & (DP_ISR_RxP|DP_ISR_RxE)) {
+				dp83902a_RxEvent();
+			}
+		}
+		DP_IN(base, DP_ISR, isr);
+	}
+}
+
+
+/* U-boot specific routines */
+static u8 *pbuf = NULL;
+
+static int pkey = -1;
+static int initialized = 0;
+
+void uboot_push_packet_len(int len) {
+	PRINTK("pushed len = %d\n", len);
+	if (len >= 2000) {
+		printf("NE2000: packet too big\n");
+		return;
+	}
+	dp83902a_recv(&pbuf[0], len);
+
+	/*Just pass it to the upper layer*/
+	NetReceive(&pbuf[0], len);
+}
+
+void uboot_push_tx_done(int key, int val) {
+	PRINTK("pushed key = %d\n", key);
+	pkey = key;
+}
+
+int eth_init(bd_t *bd) {
+	int r;
+	u8 dev_addr[6];
+	char ethaddr[20];
+
+	PRINTK("### eth_init\n");
+
+	if (!pbuf) {
+		pbuf = malloc(2000);
+		if (!pbuf) {
+			printf("Cannot allocate rx buffer\n");
+			return -1;
+		}
+	}
+
+#ifdef CONFIG_DRIVER_NE2000_CCR
+	{
+		vu_char *p = (vu_char *) CONFIG_DRIVER_NE2000_CCR;
+
+		PRINTK("CCR before is %x\n", *p);
+		*p = CONFIG_DRIVER_NE2000_VAL;
+		PRINTK("CCR after is %x\n", *p);
+	}
+#endif
+
+	nic.base = (u8 *) CONFIG_DRIVER_NE2000_BASE;
+
+	r = get_prom(dev_addr, nic.base);
+	if (!r)
+		return -1;
+
+	sprintf (ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
+		 dev_addr[0], dev_addr[1],
+		 dev_addr[2], dev_addr[3],
+		 dev_addr[4], dev_addr[5]) ;
+	PRINTK("Set environment from HW MAC addr = \"%s\"\n", ethaddr);
+	setenv ("ethaddr", ethaddr);
+
+	nic.data = nic.base + DP_DATA;
+	nic.tx_buf1 = START_PG;
+	nic.tx_buf2 = START_PG2;
+	nic.rx_buf_start = RX_START;
+	nic.rx_buf_end = RX_END;
+
+	if (dp83902a_init() == false)
+		return -1;
+
+	dp83902a_start(dev_addr);
+	initialized = 1;
+
+	return 0;
+}
+
+void eth_halt() {
+
+	PRINTK("### eth_halt\n");
+	if(initialized)
+		dp83902a_stop();
+	initialized = 0;
+}
+
+int eth_rx() {
+	dp83902a_poll();
+	return 1;
+}
+
+int eth_send(volatile void *packet, int length) {
+	int tmo;
+
+	PRINTK("### eth_send\n");
+
+	pkey = -1;
+
+	dp83902a_send((u8 *) packet, length, 666);
+	tmo = get_timer (0) + TOUT * CFG_HZ;
+	while(1) {
+		dp83902a_poll();
+		if (pkey != -1) {
+			PRINTK("Packet sucesfully sent\n");
+			return 0;
+		}
+		if (get_timer (0) >= tmo) {
+			printf("transmission error (timoeut)\n");
+			return 0;
+		}
+
+	}
+	return 0;
+}