* Patches by Richard Woodruff, 01 Oct 2004:

  add support for the TI OMAP2420 processor and its H4 reference
  board

* Patch by Christian Pellegrin, 24 Sep 2004:
  Added support for NE2000 compatible (DP8390, DP83902) NICs.

1 files changed, 963 insertions, 0 deletions

diff --git a/drivers/ne2000.c b/drivers/ne2000.c
new file mode 100644
index 0000000000..b7ed876165
--- /dev/null
+++ b/drivers/ne2000.c
@@ -0,0 +1,963 @@
+/*
+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>
+
+#ifdef CONFIG_DRIVER_NE2000
+
+/* wor around udelay resetting OCR */
+static void my_udelay(long us) {
+	long tmo;
+
+	tmo = get_timer (0) + us * CFG_HZ / 1000000; /* will this be much greater than 0 ? */
+	while (get_timer (0) < tmo);
+}
+
+#define mdelay(n)       my_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);
+
+/* timeout for tx/rx in s */
+#define TOUT 5
+
+#define ETHER_ADDR_LEN 6
+
+/*
+  ------------------------------------------------------------------------
+  Debugging details
+
+  Set to perms of:
+  0 disables all debug output
+  1 for process debug output
+  2 for added data IO output: get_reg, put_reg
+  4 for packet allocation/free output
+  8 for only startup status, so we can tell we're installed OK
+*/
+/*#define DEBUG 0xf*/
+#define DEBUG 0
+
+#if DEBUG & 1
+#define DEBUG_FUNCTION() do { printf("%s\n", __FUNCTION__); } while (0)
+#define DEBUG_LINE() do { printf("%d\n", __LINE__); } while (0)
+#else
+#define DEBUG_FUNCTION() do {} while(0)
+#define DEBUG_LINE() do {} while(0)
+#endif
+
+#include "ne2000.h"
+
+#if DEBUG & 1
+#define PRINTK(args...) printf(args)
+#else
+#define PRINTK(args...)
+#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;
+	cyg_uint8* base;
+	int i;
+
+	DEBUG_FUNCTION();
+
+	base = dp->base;
+	if (!base) return false;  /* No device found */
+
+	DEBUG_LINE();
+
+	/* 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] );
+
+	return true;
+}
+
+static void
+dp83902a_stop(void)
+{
+	dp83902a_priv_data_t *dp = &nic;
+	cyg_uint8 *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(unsigned char * enaddr)
+{
+	dp83902a_priv_data_t *dp = &nic;
+	cyg_uint8 *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_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_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 */
+	for (i = 0;  i < ETHER_ADDR_LEN;  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;
+	cyg_uint8 *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(unsigned char *data, int total_len, unsigned long key)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
+	cyg_uint8 *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). */
+
+		cyg_uint16 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 ", (unsigned long) 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;
+	cyg_uint8 *base = dp->base;
+	unsigned char rsr;
+	unsigned char 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
+
+		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);
+		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(unsigned char *data, int len)
+{
+	struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
+	cyg_uint8 *base = dp->base;
+	int i, mlen;
+	cyg_uint8 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", (unsigned long) data, mlen);
+			dx = 0;
+#endif
+			while (0 < mlen) {
+				/* Saved byte from previous loop? */
+				if (saved) {
+					*data++ = saved_char;
+					mlen--;
+					saved = false;
+					continue;
+				}
+
+				{
+					cyg_uint8 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;
+	cyg_uint8 *base = dp->base;
+	unsigned char tsr;
+	unsigned long 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;
+	cyg_uint8 *base = dp->base;
+	cyg_uint8 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;
+	cyg_uint8 *base = dp->base;
+	cyg_uint8 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;
+	cyg_uint8 *base = dp->base;
+	unsigned char 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);
+	}
+}
+
+/* find prom (taken from pc_net_cs.c from Linux) */
+
+#include "8390.h"
+
+typedef struct hw_info_t {
+	u_int	offset;
+	u_char	a0, a1, a2;
+	u_int	flags;
+} hw_info_t;
+
+#define DELAY_OUTPUT	0x01
+#define HAS_MISC_REG	0x02
+#define USE_BIG_BUF	0x04
+#define HAS_IBM_MISC	0x08
+#define IS_DL10019	0x10
+#define IS_DL10022	0x20
+#define HAS_MII		0x40
+#define USE_SHMEM	0x80	/* autodetected */
+
+#define AM79C9XX_HOME_PHY	0x00006B90  /* HomePNA PHY */
+#define AM79C9XX_ETH_PHY	0x00006B70  /* 10baseT PHY */
+#define MII_PHYID_REV_MASK	0xfffffff0
+#define MII_PHYID_REG1		0x02
+#define MII_PHYID_REG2		0x03
+
+static hw_info_t hw_info[] = {
+	{ /* Accton EN2212 */ 0x0ff0, 0x00, 0x00, 0xe8, DELAY_OUTPUT },
+	{ /* Allied Telesis LA-PCM */ 0x0ff0, 0x00, 0x00, 0xf4, 0 },
+	{ /* APEX MultiCard */ 0x03f4, 0x00, 0x20, 0xe5, 0 },
+	{ /* ASANTE FriendlyNet */ 0x4910, 0x00, 0x00, 0x94,
+	  DELAY_OUTPUT | HAS_IBM_MISC },
+	{ /* Danpex EN-6200P2 */ 0x0110, 0x00, 0x40, 0xc7, 0 },
+	{ /* DataTrek NetCard */ 0x0ff0, 0x00, 0x20, 0xe8, 0 },
+	{ /* Dayna CommuniCard E */ 0x0110, 0x00, 0x80, 0x19, 0 },
+	{ /* D-Link DE-650 */ 0x0040, 0x00, 0x80, 0xc8, 0 },
+	{ /* EP-210 Ethernet */ 0x0110, 0x00, 0x40, 0x33, 0 },
+	{ /* EP4000 Ethernet */ 0x01c0, 0x00, 0x00, 0xb4, 0 },
+	{ /* Epson EEN10B */ 0x0ff0, 0x00, 0x00, 0x48,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* ELECOM Laneed LD-CDWA */ 0xb8, 0x08, 0x00, 0x42, 0 },
+	{ /* Hypertec Ethernet */ 0x01c0, 0x00, 0x40, 0x4c, 0 },
+	{ /* IBM CCAE */ 0x0ff0, 0x08, 0x00, 0x5a,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* IBM CCAE */ 0x0ff0, 0x00, 0x04, 0xac,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* IBM CCAE */ 0x0ff0, 0x00, 0x06, 0x29,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* IBM FME */ 0x0374, 0x08, 0x00, 0x5a,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* IBM FME */ 0x0374, 0x00, 0x04, 0xac,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* Kansai KLA-PCM/T */ 0x0ff0, 0x00, 0x60, 0x87,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* NSC DP83903 */ 0x0374, 0x08, 0x00, 0x17,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* NSC DP83903 */ 0x0374, 0x00, 0xc0, 0xa8,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* NSC DP83903 */ 0x0374, 0x00, 0xa0, 0xb0,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* NSC DP83903 */ 0x0198, 0x00, 0x20, 0xe0,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* I-O DATA PCLA/T */ 0x0ff0, 0x00, 0xa0, 0xb0, 0 },
+	{ /* Katron PE-520 */ 0x0110, 0x00, 0x40, 0xf6, 0 },
+	{ /* Kingston KNE-PCM/x */ 0x0ff0, 0x00, 0xc0, 0xf0,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* Kingston KNE-PCM/x */ 0x0ff0, 0xe2, 0x0c, 0x0f,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* Kingston KNE-PC2 */ 0x0180, 0x00, 0xc0, 0xf0, 0 },
+	{ /* Maxtech PCN2000 */ 0x5000, 0x00, 0x00, 0xe8, 0 },
+	{ /* NDC Instant-Link */ 0x003a, 0x00, 0x80, 0xc6, 0 },
+	{ /* NE2000 Compatible */ 0x0ff0, 0x00, 0xa0, 0x0c, 0 },
+	{ /* Network General Sniffer */ 0x0ff0, 0x00, 0x00, 0x65,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* Panasonic VEL211 */ 0x0ff0, 0x00, 0x80, 0x45,
+	  HAS_MISC_REG | HAS_IBM_MISC },
+	{ /* PreMax PE-200 */ 0x07f0, 0x00, 0x20, 0xe0, 0 },
+	{ /* RPTI EP400 */ 0x0110, 0x00, 0x40, 0x95, 0 },
+	{ /* SCM Ethernet */ 0x0ff0, 0x00, 0x20, 0xcb, 0 },
+	{ /* Socket EA */ 0x4000, 0x00, 0xc0, 0x1b,
+	  DELAY_OUTPUT | HAS_MISC_REG | USE_BIG_BUF },
+	{ /* Socket LP-E CF+ */ 0x01c0, 0x00, 0xc0, 0x1b, 0 },
+	{ /* SuperSocket RE450T */ 0x0110, 0x00, 0xe0, 0x98, 0 },
+	{ /* Volktek NPL-402CT */ 0x0060, 0x00, 0x40, 0x05, 0 },
+	{ /* NEC PC-9801N-J12 */ 0x0ff0, 0x00, 0x00, 0x4c, 0 },
+	{ /* PCMCIA Technology OEM */ 0x01c8, 0x00, 0xa0, 0x0c, 0 }
+};
+
+#define NR_INFO		(sizeof(hw_info)/sizeof(hw_info_t))
+
+static hw_info_t default_info = { 0, 0, 0, 0, 0 };
+
+unsigned char dev_addr[6];
+
+#define PCNET_CMD	0x00
+#define PCNET_DATAPORT	0x10	/* NatSemi-defined port window offset. */
+#define PCNET_RESET	0x1f	/* Issue a read to reset, a write to clear. */
+#define PCNET_MISC	0x18	/* For IBM CCAE and Socket EA cards */
+
+unsigned long nic_base;
+
+static void pcnet_reset_8390(void)
+{
+	int i, r;
+
+	PRINTK("nic base is %lx\n", nic_base);
+
+#if 1
+	n2k_outb(E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD);
+	PRINTK("cmd (at %lx) is %x\n", nic_base+ E8390_CMD, n2k_inb(E8390_CMD));
+	n2k_outb(E8390_NODMA+E8390_PAGE1+E8390_STOP, E8390_CMD);
+	PRINTK("cmd (at %lx) is %x\n", nic_base+ E8390_CMD, n2k_inb(E8390_CMD));
+	n2k_outb(E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD);
+	PRINTK("cmd (at %lx) is %x\n", nic_base+ E8390_CMD, n2k_inb(E8390_CMD));
+#endif
+	n2k_outb(E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD);
+
+	n2k_outb(n2k_inb(nic_base + PCNET_RESET), PCNET_RESET);
+
+	for (i = 0; i < 100; i++) {
+		if ((r = (n2k_inb(EN0_ISR) & ENISR_RESET)) != 0)
+			break;
+		PRINTK("got %x in reset\n", r);
+		my_udelay(100);
+	}
+	n2k_outb(ENISR_RESET, EN0_ISR); /* Ack intr. */
+
+	if (i == 100)
+		printf("pcnet_reset_8390() did not complete.\n");
+} /* pcnet_reset_8390 */
+
+static hw_info_t * get_prom(void ) {
+	unsigned char prom[32];
+	int i, j;
+	struct {
+		u_char value, offset;
+	} program_seq[] = {
+		{E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, /* Select page 0*/
+		{0x48,	EN0_DCFG},	/* Set byte-wide (0x48) access. */
+		{0x00,	EN0_RCNTLO},	/* Clear the count regs. */
+		{0x00,	EN0_RCNTHI},
+		{0x00,	EN0_IMR},	/* Mask completion irq. */
+		{0xFF,	EN0_ISR},
+		{E8390_RXOFF, EN0_RXCR},	/* 0x20  Set to monitor */
+		{E8390_TXOFF, EN0_TXCR},	/* 0x02  and loopback mode. */
+		{32,	EN0_RCNTLO},
+		{0x00,	EN0_RCNTHI},
+		{0x00,	EN0_RSARLO},	/* DMA starting at 0x0000. */
+		{0x00,	EN0_RSARHI},
+		{E8390_RREAD+E8390_START, E8390_CMD},
+	};
+
+	PRINTK("trying to get MAC via prom reading\n");
+
+	pcnet_reset_8390();
+
+	mdelay(10);
+
+	for (i = 0; i < sizeof(program_seq)/sizeof(program_seq[0]); i++)
+		n2k_outb(program_seq[i].value, program_seq[i].offset);
+
+	PRINTK("PROM:");
+	for (i = 0; i < 32; i++) {
+		prom[i] = n2k_inb(PCNET_DATAPORT);
+		PRINTK(" %02x", prom[i]);
+	}
+	PRINTK("\n");
+	for (i = 0; i < NR_INFO; i++) {
+		if ((prom[0] == hw_info[i].a0) &&
+		    (prom[2] == hw_info[i].a1) &&
+		    (prom[4] == hw_info[i].a2)) {
+			PRINTK("matched board %d\n", i);
+			break;
+		}
+	}
+	if ((i < NR_INFO) || ((prom[28] == 0x57) && (prom[30] == 0x57))) {
+		for (j = 0; j < 6; j++)
+			dev_addr[j] = prom[j<<1];
+		PRINTK("on exit i is %d/%ld\n", i, NR_INFO);
+		PRINTK("MAC address is %02x:%02x:%02x:%02x:%02x:%02x\n",
+		       dev_addr[0],dev_addr[1],dev_addr[2],dev_addr[3],dev_addr[4],dev_addr[5]);
+		return (i < NR_INFO) ? hw_info+i : &default_info;
+	}
+	return NULL;
+}
+
+/* U-boot specific routines */
+
+#define NB 5
+
+static unsigned char *pbuf = NULL;
+static int plen[NB];
+static int nrx = 0;
+
+static int pkey = -1;
+
+void uboot_push_packet_len(int len) {
+	PRINTK("pushed len = %d, nrx = %d\n", len, nrx);
+	if (len>=2000) {
+		printf("NE2000: packet too big\n");
+		return;
+	}
+	if (nrx >= NB) {
+		printf("losing packets in rx\n");
+		return;
+	}
+	plen[nrx] = len;
+	dp83902a_recv(&pbuf[nrx*2000], len);
+	nrx++;
+}
+
+void uboot_push_tx_done(int key, int val) {
+	PRINTK("pushed key = %d\n", key);
+	pkey = key;
+}
+
+int eth_init(bd_t *bd) {
+	static hw_info_t * r;
+	char ethaddr[20];
+
+	PRINTK("### eth_init\n");
+
+	if (!pbuf) {
+		pbuf = malloc(NB*2000);
+		if (!pbuf) {
+			printf("Cannot allocate rx buffers\n");
+			return -1;
+		}
+	}
+
+#ifdef CONFIG_DRIVER_NE2000_CCR
+	{
+		volatile unsigned char *p =  (volatile unsigned 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 = CONFIG_DRIVER_NE2000_BASE;
+	nic.base = (cyg_uint8 *) CONFIG_DRIVER_NE2000_BASE;
+
+	r = get_prom();
+	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);
+
+
+#define DP_DATA		0x10
+	nic.data = nic.base + DP_DATA;
+	nic.tx_buf1 = 0x40;
+	nic.tx_buf2 = 0x48;
+	nic.rx_buf_start = 0x50;
+	nic.rx_buf_end = 0x80;
+
+	if (dp83902a_init() == false)
+		return -1;
+	dp83902a_start(dev_addr);
+	return 0;
+}
+
+void eth_halt() {
+
+	PRINTK("### eth_halt\n");
+
+	dp83902a_stop();
+}
+
+int eth_rx() {
+	int j, tmo;
+
+	PRINTK("### eth_rx\n");
+
+	tmo = get_timer (0) + TOUT * CFG_HZ;
+	while(1) {
+		dp83902a_poll();
+		if (nrx > 0) {
+			for(j=0; j<nrx; j++) {
+				NetReceive(&pbuf[j*2000], plen[j]);
+			}
+			nrx = 0;
+			return 1;
+		}
+		if (get_timer (0) >= tmo) {
+			printf("timeout during rx\n");
+			return 0;
+		}
+	}
+	return 0;
+}
+
+int eth_send(volatile void *packet, int length) {
+	int tmo;
+
+	PRINTK("### eth_send\n");
+
+	pkey = -1;
+
+	dp83902a_send((unsigned char *) 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;
+}
+
+#endif