Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 3904 insertions, 0 deletions

diff --git a/drivers/net/ethernet/cirrus/Kconfig b/drivers/net/ethernet/cirrus/Kconfig
new file mode 100644
index 0000000000..5bdf731d95
--- /dev/null
+++ b/drivers/net/ethernet/cirrus/Kconfig
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Cirrus network device configuration
+#
+
+config NET_VENDOR_CIRRUS
+	bool "Cirrus devices"
+	default y
+	depends on ISA || EISA || ARM || MAC || COMPILE_TEST
+	help
+	  If you have a network (Ethernet) card belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about Cirrus cards. If you say Y, you will be asked
+	  for your specific card in the following questions.
+
+if NET_VENDOR_CIRRUS
+
+config CS89x0
+	tristate
+
+config CS89x0_ISA
+	tristate "CS89x0 ISA driver support"
+	depends on HAS_IOPORT_MAP
+	depends on ISA
+	depends on !PPC32
+	depends on CS89x0_PLATFORM=n
+	select NETDEV_LEGACY_INIT
+	select CS89x0
+	help
+	  Support for CS89x0 chipset based Ethernet cards. If you have a
+	  network (Ethernet) card of this type, say Y and read the file
+	  <file:Documentation/networking/device_drivers/ethernet/cirrus/cs89x0.rst>.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called cs89x0.
+
+config CS89x0_PLATFORM
+	tristate "CS89x0 platform driver support"
+	depends on ARM || (COMPILE_TEST && !PPC)
+	select CS89x0
+	help
+	  Say Y to compile the cs89x0 platform driver. This makes this driver
+	  suitable for use on certain evaluation boards such as the iMX21ADS.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called cs89x0.
+
+config EP93XX_ETH
+	tristate "EP93xx Ethernet support"
+	depends on (ARM && ARCH_EP93XX) || COMPILE_TEST
+	select MII
+	help
+	  This is a driver for the ethernet hardware included in EP93xx CPUs.
+	  Say Y if you are building a kernel for EP93xx based devices.
+
+config MAC89x0
+	tristate "Macintosh CS89x0 based ethernet cards"
+	depends on MAC
+	help
+	  Support for CS89x0 chipset based Ethernet cards.  If you have a
+	  Nubus or LC-PDS network (Ethernet) card of this type, say Y here.
+
+	  To compile this driver as a module, choose M here. This module will
+	  be called mac89x0.
+
+endif # NET_VENDOR_CIRRUS
diff --git a/drivers/net/ethernet/cirrus/Makefile b/drivers/net/ethernet/cirrus/Makefile
new file mode 100644
index 0000000000..84865e5937
--- /dev/null
+++ b/drivers/net/ethernet/cirrus/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the Cirrus network device drivers.
+#
+
+obj-$(CONFIG_CS89x0) += cs89x0.o
+obj-$(CONFIG_EP93XX_ETH) += ep93xx_eth.o
+obj-$(CONFIG_MAC89x0) += mac89x0.o
diff --git a/drivers/net/ethernet/cirrus/cs89x0.c b/drivers/net/ethernet/cirrus/cs89x0.c
new file mode 100644
index 0000000000..d323c5c235
--- /dev/null
+++ b/drivers/net/ethernet/cirrus/cs89x0.c
@@ -0,0 +1,1916 @@
+/* cs89x0.c: A Crystal Semiconductor (Now Cirrus Logic) CS89[02]0
+ *           driver for linux.
+ * Written 1996 by Russell Nelson, with reference to skeleton.c
+ * written 1993-1994 by Donald Becker.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * The author may be reached at nelson@crynwr.com, Crynwr
+ * Software, 521 Pleasant Valley Rd., Potsdam, NY 13676
+ *
+ * Other contributors:
+ * Mike Cruse        : mcruse@cti-ltd.com
+ * Russ Nelson
+ * Melody Lee        : ethernet@crystal.cirrus.com
+ * Alan Cox
+ * Andrew Morton
+ * Oskar Schirmer    : oskar@scara.com
+ * Deepak Saxena     : dsaxena@plexity.net
+ * Dmitry Pervushin  : dpervushin@ru.mvista.com
+ * Deepak Saxena     : dsaxena@plexity.net
+ * Domenico Andreoli : cavokz@gmail.com
+ */
+
+
+/*
+ * Set this to zero to disable DMA code
+ *
+ * Note that even if DMA is turned off we still support the 'dma' and  'use_dma'
+ * module options so we don't break any startup scripts.
+ */
+#ifndef CONFIG_ISA_DMA_API
+#define ALLOW_DMA	0
+#else
+#define ALLOW_DMA	1
+#endif
+
+/*
+ * Set this to zero to remove all the debug statements via
+ * dead code elimination
+ */
+#define DEBUGGING	1
+
+/* Sources:
+ *	Crynwr packet driver epktisa.
+ *	Crystal Semiconductor data sheets.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/jiffies.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+#include <linux/io.h>
+
+#include <net/Space.h>
+
+#include <asm/irq.h>
+#include <linux/atomic.h>
+#if ALLOW_DMA
+#include <asm/dma.h>
+#endif
+
+#include "cs89x0.h"
+
+#define cs89_dbg(val, level, fmt, ...)				\
+do {								\
+	if (val <= net_debug)					\
+		pr_##level(fmt, ##__VA_ARGS__);			\
+} while (0)
+
+static char version[] __initdata =
+	"v2.4.3-pre1 Russell Nelson <nelson@crynwr.com>, Andrew Morton";
+
+#define DRV_NAME "cs89x0"
+
+/* First, a few definitions that the brave might change.
+ * A zero-terminated list of I/O addresses to be probed. Some special flags..
+ * Addr & 1 = Read back the address port, look for signature and reset
+ * the page window before probing
+ * Addr & 3 = Reset the page window and probe
+ * The CLPS eval board has the Cirrus chip at 0x80090300, in ARM IO space,
+ * but it is possible that a Cirrus board could be plugged into the ISA
+ * slots.
+ */
+/* The cs8900 has 4 IRQ pins, software selectable. cs8900_irq_map maps
+ * them to system IRQ numbers. This mapping is card specific and is set to
+ * the configuration of the Cirrus Eval board for this chip.
+ */
+#if IS_ENABLED(CONFIG_CS89x0_ISA)
+static unsigned int netcard_portlist[] __used __initdata = {
+	0x300, 0x320, 0x340, 0x360, 0x200, 0x220, 0x240,
+	0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0
+};
+static unsigned int cs8900_irq_map[] = {
+	10, 11, 12, 5
+};
+#endif
+
+#if DEBUGGING
+static unsigned int net_debug = DEBUGGING;
+#else
+#define net_debug 0	/* gcc will remove all the debug code for us */
+#endif
+
+/* The number of low I/O ports used by the ethercard. */
+#define NETCARD_IO_EXTENT	16
+
+/* we allow the user to override various values normally set in the EEPROM */
+#define FORCE_RJ45	0x0001    /* pick one of these three */
+#define FORCE_AUI	0x0002
+#define FORCE_BNC	0x0004
+
+#define FORCE_AUTO	0x0010    /* pick one of these three */
+#define FORCE_HALF	0x0020
+#define FORCE_FULL	0x0030
+
+/* Information that need to be kept for each board. */
+struct net_local {
+	int chip_type;		/* one of: CS8900, CS8920, CS8920M */
+	char chip_revision;	/* revision letter of the chip ('A'...) */
+	int send_cmd;		/* the proper send command: TX_NOW, TX_AFTER_381, or TX_AFTER_ALL */
+	int auto_neg_cnf;	/* auto-negotiation word from EEPROM */
+	int adapter_cnf;	/* adapter configuration from EEPROM */
+	int isa_config;		/* ISA configuration from EEPROM */
+	int irq_map;		/* IRQ map from EEPROM */
+	int rx_mode;		/* what mode are we in? 0, RX_MULTCAST_ACCEPT, or RX_ALL_ACCEPT */
+	int curr_rx_cfg;	/* a copy of PP_RxCFG */
+	int linectl;		/* either 0 or LOW_RX_SQUELCH, depending on configuration. */
+	int send_underrun;	/* keep track of how many underruns in a row we get */
+	int force;		/* force various values; see FORCE* above. */
+	spinlock_t lock;
+	void __iomem *virt_addr;/* CS89x0 virtual address. */
+#if ALLOW_DMA
+	int use_dma;		/* Flag: we're using dma */
+	int dma;		/* DMA channel */
+	int dmasize;		/* 16 or 64 */
+	unsigned char *dma_buff;	/* points to the beginning of the buffer */
+	unsigned char *end_dma_buff;	/* points to the end of the buffer */
+	unsigned char *rx_dma_ptr;	/* points to the next packet  */
+#endif
+};
+
+/* Example routines you must write ;->. */
+#define tx_done(dev) 1
+
+/*
+ * Permit 'cs89x0_dma=N' in the kernel boot environment
+ */
+#if !defined(MODULE)
+#if ALLOW_DMA
+static int g_cs89x0_dma;
+
+static int __init dma_fn(char *str)
+{
+	g_cs89x0_dma = simple_strtol(str, NULL, 0);
+	return 1;
+}
+
+__setup("cs89x0_dma=", dma_fn);
+#endif	/* ALLOW_DMA */
+
+static int g_cs89x0_media__force;
+
+static int __init media_fn(char *str)
+{
+	if (!strcmp(str, "rj45"))
+		g_cs89x0_media__force = FORCE_RJ45;
+	else if (!strcmp(str, "aui"))
+		g_cs89x0_media__force = FORCE_AUI;
+	else if (!strcmp(str, "bnc"))
+		g_cs89x0_media__force = FORCE_BNC;
+
+	return 1;
+}
+
+__setup("cs89x0_media=", media_fn);
+#endif
+
+static void readwords(struct net_local *lp, int portno, void *buf, int length)
+{
+	u8 *buf8 = (u8 *)buf;
+
+	do {
+		u16 tmp16;
+
+		tmp16 = ioread16(lp->virt_addr + portno);
+		*buf8++ = (u8)tmp16;
+		*buf8++ = (u8)(tmp16 >> 8);
+	} while (--length);
+}
+
+static void writewords(struct net_local *lp, int portno, void *buf, int length)
+{
+	u8 *buf8 = (u8 *)buf;
+
+	do {
+		u16 tmp16;
+
+		tmp16 = *buf8++;
+		tmp16 |= (*buf8++) << 8;
+		iowrite16(tmp16, lp->virt_addr + portno);
+	} while (--length);
+}
+
+static u16
+readreg(struct net_device *dev, u16 regno)
+{
+	struct net_local *lp = netdev_priv(dev);
+
+	iowrite16(regno, lp->virt_addr + ADD_PORT);
+	return ioread16(lp->virt_addr + DATA_PORT);
+}
+
+static void
+writereg(struct net_device *dev, u16 regno, u16 value)
+{
+	struct net_local *lp = netdev_priv(dev);
+
+	iowrite16(regno, lp->virt_addr + ADD_PORT);
+	iowrite16(value, lp->virt_addr + DATA_PORT);
+}
+
+static int __init
+wait_eeprom_ready(struct net_device *dev)
+{
+	unsigned long timeout = jiffies;
+	/* check to see if the EEPROM is ready,
+	 * a timeout is used just in case EEPROM is ready when
+	 * SI_BUSY in the PP_SelfST is clear
+	 */
+	while (readreg(dev, PP_SelfST) & SI_BUSY)
+		if (time_after_eq(jiffies, timeout + 40))
+			return -1;
+	return 0;
+}
+
+static int __init
+get_eeprom_data(struct net_device *dev, int off, int len, int *buffer)
+{
+	int i;
+
+	cs89_dbg(3, info, "EEPROM data from %x for %x:", off, len);
+	for (i = 0; i < len; i++) {
+		if (wait_eeprom_ready(dev) < 0)
+			return -1;
+		/* Now send the EEPROM read command and EEPROM location to read */
+		writereg(dev, PP_EECMD, (off + i) | EEPROM_READ_CMD);
+		if (wait_eeprom_ready(dev) < 0)
+			return -1;
+		buffer[i] = readreg(dev, PP_EEData);
+		cs89_dbg(3, cont, " %04x", buffer[i]);
+	}
+	cs89_dbg(3, cont, "\n");
+	return 0;
+}
+
+static int  __init
+get_eeprom_cksum(int off, int len, int *buffer)
+{
+	int i, cksum;
+
+	cksum = 0;
+	for (i = 0; i < len; i++)
+		cksum += buffer[i];
+	cksum &= 0xffff;
+	if (cksum == 0)
+		return 0;
+	return -1;
+}
+
+static void
+write_irq(struct net_device *dev, int chip_type, int irq)
+{
+	int i;
+
+	if (chip_type == CS8900) {
+#if IS_ENABLED(CONFIG_CS89x0_ISA)
+		/* Search the mapping table for the corresponding IRQ pin. */
+		for (i = 0; i != ARRAY_SIZE(cs8900_irq_map); i++)
+			if (cs8900_irq_map[i] == irq)
+				break;
+		/* Not found */
+		if (i == ARRAY_SIZE(cs8900_irq_map))
+			i = 3;
+#else
+		/* INTRQ0 pin is used for interrupt generation. */
+		i = 0;
+#endif
+		writereg(dev, PP_CS8900_ISAINT, i);
+	} else {
+		writereg(dev, PP_CS8920_ISAINT, irq);
+	}
+}
+
+static void
+count_rx_errors(int status, struct net_device *dev)
+{
+	dev->stats.rx_errors++;
+	if (status & RX_RUNT)
+		dev->stats.rx_length_errors++;
+	if (status & RX_EXTRA_DATA)
+		dev->stats.rx_length_errors++;
+	if ((status & RX_CRC_ERROR) && !(status & (RX_EXTRA_DATA | RX_RUNT)))
+		/* per str 172 */
+		dev->stats.rx_crc_errors++;
+	if (status & RX_DRIBBLE)
+		dev->stats.rx_frame_errors++;
+}
+
+/*********************************
+ * This page contains DMA routines
+ *********************************/
+
+#if ALLOW_DMA
+
+#define dma_page_eq(ptr1, ptr2) ((long)(ptr1) >> 17 == (long)(ptr2) >> 17)
+
+static void
+get_dma_channel(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+
+	if (lp->dma) {
+		dev->dma = lp->dma;
+		lp->isa_config |= ISA_RxDMA;
+	} else {
+		if ((lp->isa_config & ANY_ISA_DMA) == 0)
+			return;
+		dev->dma = lp->isa_config & DMA_NO_MASK;
+		if (lp->chip_type == CS8900)
+			dev->dma += 5;
+		if (dev->dma < 5 || dev->dma > 7) {
+			lp->isa_config &= ~ANY_ISA_DMA;
+			return;
+		}
+	}
+}
+
+static void
+write_dma(struct net_device *dev, int chip_type, int dma)
+{
+	struct net_local *lp = netdev_priv(dev);
+	if ((lp->isa_config & ANY_ISA_DMA) == 0)
+		return;
+	if (chip_type == CS8900)
+		writereg(dev, PP_CS8900_ISADMA, dma - 5);
+	else
+		writereg(dev, PP_CS8920_ISADMA, dma);
+}
+
+static void
+set_dma_cfg(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+
+	if (lp->use_dma) {
+		if ((lp->isa_config & ANY_ISA_DMA) == 0) {
+			cs89_dbg(3, err, "set_dma_cfg(): no DMA\n");
+			return;
+		}
+		if (lp->isa_config & ISA_RxDMA) {
+			lp->curr_rx_cfg |= RX_DMA_ONLY;
+			cs89_dbg(3, info, "set_dma_cfg(): RX_DMA_ONLY\n");
+		} else {
+			lp->curr_rx_cfg |= AUTO_RX_DMA;	/* not that we support it... */
+			cs89_dbg(3, info, "set_dma_cfg(): AUTO_RX_DMA\n");
+		}
+	}
+}
+
+static int
+dma_bufcfg(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	if (lp->use_dma)
+		return (lp->isa_config & ANY_ISA_DMA) ? RX_DMA_ENBL : 0;
+	else
+		return 0;
+}
+
+static int
+dma_busctl(struct net_device *dev)
+{
+	int retval = 0;
+	struct net_local *lp = netdev_priv(dev);
+	if (lp->use_dma) {
+		if (lp->isa_config & ANY_ISA_DMA)
+			retval |= RESET_RX_DMA; /* Reset the DMA pointer */
+		if (lp->isa_config & DMA_BURST)
+			retval |= DMA_BURST_MODE; /* Does ISA config specify DMA burst ? */
+		if (lp->dmasize == 64)
+			retval |= RX_DMA_SIZE_64K; /* did they ask for 64K? */
+		retval |= MEMORY_ON;	/* we need memory enabled to use DMA. */
+	}
+	return retval;
+}
+
+static void
+dma_rx(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	struct sk_buff *skb;
+	int status, length;
+	unsigned char *bp = lp->rx_dma_ptr;
+
+	status = bp[0] + (bp[1] << 8);
+	length = bp[2] + (bp[3] << 8);
+	bp += 4;
+
+	cs89_dbg(5, debug, "%s: receiving DMA packet at %lx, status %x, length %x\n",
+		 dev->name, (unsigned long)bp, status, length);
+
+	if ((status & RX_OK) == 0) {
+		count_rx_errors(status, dev);
+		goto skip_this_frame;
+	}
+
+	/* Malloc up new buffer. */
+	skb = netdev_alloc_skb(dev, length + 2);
+	if (skb == NULL) {
+		dev->stats.rx_dropped++;
+
+		/* AKPM: advance bp to the next frame */
+skip_this_frame:
+		bp += (length + 3) & ~3;
+		if (bp >= lp->end_dma_buff)
+			bp -= lp->dmasize * 1024;
+		lp->rx_dma_ptr = bp;
+		return;
+	}
+	skb_reserve(skb, 2);	/* longword align L3 header */
+
+	if (bp + length > lp->end_dma_buff) {
+		int semi_cnt = lp->end_dma_buff - bp;
+		skb_put_data(skb, bp, semi_cnt);
+		skb_put_data(skb, lp->dma_buff, length - semi_cnt);
+	} else {
+		skb_put_data(skb, bp, length);
+	}
+	bp += (length + 3) & ~3;
+	if (bp >= lp->end_dma_buff)
+		bp -= lp->dmasize*1024;
+	lp->rx_dma_ptr = bp;
+
+	cs89_dbg(3, info, "%s: received %d byte DMA packet of type %x\n",
+		 dev->name, length,
+		 ((skb->data[ETH_ALEN + ETH_ALEN] << 8) |
+		  skb->data[ETH_ALEN + ETH_ALEN + 1]));
+
+	skb->protocol = eth_type_trans(skb, dev);
+	netif_rx(skb);
+	dev->stats.rx_packets++;
+	dev->stats.rx_bytes += length;
+}
+
+static void release_dma_buff(struct net_local *lp)
+{
+	if (lp->dma_buff) {
+		free_pages((unsigned long)(lp->dma_buff),
+			   get_order(lp->dmasize * 1024));
+		lp->dma_buff = NULL;
+	}
+}
+
+#endif	/* ALLOW_DMA */
+
+static void
+control_dc_dc(struct net_device *dev, int on_not_off)
+{
+	struct net_local *lp = netdev_priv(dev);
+	unsigned int selfcontrol;
+	unsigned long timenow = jiffies;
+	/* control the DC to DC convertor in the SelfControl register.
+	 * Note: This is hooked up to a general purpose pin, might not
+	 * always be a DC to DC convertor.
+	 */
+
+	selfcontrol = HCB1_ENBL; /* Enable the HCB1 bit as an output */
+	if (((lp->adapter_cnf & A_CNF_DC_DC_POLARITY) != 0) ^ on_not_off)
+		selfcontrol |= HCB1;
+	else
+		selfcontrol &= ~HCB1;
+	writereg(dev, PP_SelfCTL, selfcontrol);
+
+	/* Wait for the DC/DC converter to power up - 500ms */
+	while (time_before(jiffies, timenow + HZ))
+		;
+}
+
+/* send a test packet - return true if carrier bits are ok */
+static int
+send_test_pkt(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	char test_packet[] = {
+		0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0,
+		0, 46,		/* A 46 in network order */
+		0, 0,		/* DSAP=0 & SSAP=0 fields */
+		0xf3, 0		/* Control (Test Req + P bit set) */
+	};
+	unsigned long timenow = jiffies;
+
+	writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_TX_ON);
+
+	memcpy(test_packet,            dev->dev_addr, ETH_ALEN);
+	memcpy(test_packet + ETH_ALEN, dev->dev_addr, ETH_ALEN);
+
+	iowrite16(TX_AFTER_ALL, lp->virt_addr + TX_CMD_PORT);
+	iowrite16(ETH_ZLEN, lp->virt_addr + TX_LEN_PORT);
+
+	/* Test to see if the chip has allocated memory for the packet */
+	while (time_before(jiffies, timenow + 5))
+		if (readreg(dev, PP_BusST) & READY_FOR_TX_NOW)
+			break;
+	if (time_after_eq(jiffies, timenow + 5))
+		return 0;	/* this shouldn't happen */
+
+	/* Write the contents of the packet */
+	writewords(lp, TX_FRAME_PORT, test_packet, (ETH_ZLEN + 1) >> 1);
+
+	cs89_dbg(1, debug, "Sending test packet ");
+	/* wait a couple of jiffies for packet to be received */
+	for (timenow = jiffies; time_before(jiffies, timenow + 3);)
+		;
+	if ((readreg(dev, PP_TxEvent) & TX_SEND_OK_BITS) == TX_OK) {
+		cs89_dbg(1, cont, "succeeded\n");
+		return 1;
+	}
+	cs89_dbg(1, cont, "failed\n");
+	return 0;
+}
+
+#define DETECTED_NONE  0
+#define DETECTED_RJ45H 1
+#define DETECTED_RJ45F 2
+#define DETECTED_AUI   3
+#define DETECTED_BNC   4
+
+static int
+detect_tp(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	unsigned long timenow = jiffies;
+	int fdx;
+
+	cs89_dbg(1, debug, "%s: Attempting TP\n", dev->name);
+
+	/* If connected to another full duplex capable 10-Base-T card
+	 * the link pulses seem to be lost when the auto detect bit in
+	 * the LineCTL is set.  To overcome this the auto detect bit will
+	 * be cleared whilst testing the 10-Base-T interface.  This would
+	 * not be necessary for the sparrow chip but is simpler to do it
+	 * anyway.
+	 */
+	writereg(dev, PP_LineCTL, lp->linectl & ~AUI_ONLY);
+	control_dc_dc(dev, 0);
+
+	/* Delay for the hardware to work out if the TP cable is present
+	 * - 150ms
+	 */
+	for (timenow = jiffies; time_before(jiffies, timenow + 15);)
+		;
+	if ((readreg(dev, PP_LineST) & LINK_OK) == 0)
+		return DETECTED_NONE;
+
+	if (lp->chip_type == CS8900) {
+		switch (lp->force & 0xf0) {
+#if 0
+		case FORCE_AUTO:
+			pr_info("%s: cs8900 doesn't autonegotiate\n",
+				dev->name);
+			return DETECTED_NONE;
+#endif
+			/* CS8900 doesn't support AUTO, change to HALF*/
+		case FORCE_AUTO:
+			lp->force &= ~FORCE_AUTO;
+			lp->force |= FORCE_HALF;
+			break;
+		case FORCE_HALF:
+			break;
+		case FORCE_FULL:
+			writereg(dev, PP_TestCTL,
+				 readreg(dev, PP_TestCTL) | FDX_8900);
+			break;
+		}
+		fdx = readreg(dev, PP_TestCTL) & FDX_8900;
+	} else {
+		switch (lp->force & 0xf0) {
+		case FORCE_AUTO:
+			lp->auto_neg_cnf = AUTO_NEG_ENABLE;
+			break;
+		case FORCE_HALF:
+			lp->auto_neg_cnf = 0;
+			break;
+		case FORCE_FULL:
+			lp->auto_neg_cnf = RE_NEG_NOW | ALLOW_FDX;
+			break;
+		}
+
+		writereg(dev, PP_AutoNegCTL, lp->auto_neg_cnf & AUTO_NEG_MASK);
+
+		if ((lp->auto_neg_cnf & AUTO_NEG_BITS) == AUTO_NEG_ENABLE) {
+			pr_info("%s: negotiating duplex...\n", dev->name);
+			while (readreg(dev, PP_AutoNegST) & AUTO_NEG_BUSY) {
+				if (time_after(jiffies, timenow + 4000)) {
+					pr_err("**** Full / half duplex auto-negotiation timed out ****\n");
+					break;
+				}
+			}
+		}
+		fdx = readreg(dev, PP_AutoNegST) & FDX_ACTIVE;
+	}
+	if (fdx)
+		return DETECTED_RJ45F;
+	else
+		return DETECTED_RJ45H;
+}
+
+static int
+detect_bnc(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+
+	cs89_dbg(1, debug, "%s: Attempting BNC\n", dev->name);
+	control_dc_dc(dev, 1);
+
+	writereg(dev, PP_LineCTL, (lp->linectl & ~AUTO_AUI_10BASET) | AUI_ONLY);
+
+	if (send_test_pkt(dev))
+		return DETECTED_BNC;
+	else
+		return DETECTED_NONE;
+}
+
+static int
+detect_aui(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+
+	cs89_dbg(1, debug, "%s: Attempting AUI\n", dev->name);
+	control_dc_dc(dev, 0);
+
+	writereg(dev, PP_LineCTL, (lp->linectl & ~AUTO_AUI_10BASET) | AUI_ONLY);
+
+	if (send_test_pkt(dev))
+		return DETECTED_AUI;
+	else
+		return DETECTED_NONE;
+}
+
+/* We have a good packet(s), get it/them out of the buffers. */
+static void
+net_rx(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	struct sk_buff *skb;
+	int status, length;
+
+	status = ioread16(lp->virt_addr + RX_FRAME_PORT);
+	length = ioread16(lp->virt_addr + RX_FRAME_PORT);
+
+	if ((status & RX_OK) == 0) {
+		count_rx_errors(status, dev);
+		return;
+	}
+
+	/* Malloc up new buffer. */
+	skb = netdev_alloc_skb(dev, length + 2);
+	if (skb == NULL) {
+		dev->stats.rx_dropped++;
+		return;
+	}
+	skb_reserve(skb, 2);	/* longword align L3 header */
+
+	readwords(lp, RX_FRAME_PORT, skb_put(skb, length), length >> 1);
+	if (length & 1)
+		skb->data[length-1] = ioread16(lp->virt_addr + RX_FRAME_PORT);
+
+	cs89_dbg(3, debug, "%s: received %d byte packet of type %x\n",
+		 dev->name, length,
+		 (skb->data[ETH_ALEN + ETH_ALEN] << 8) |
+		 skb->data[ETH_ALEN + ETH_ALEN + 1]);
+
+	skb->protocol = eth_type_trans(skb, dev);
+	netif_rx(skb);
+	dev->stats.rx_packets++;
+	dev->stats.rx_bytes += length;
+}
+
+/* The typical workload of the driver:
+ * Handle the network interface interrupts.
+ */
+
+static irqreturn_t net_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct net_local *lp;
+	int status;
+	int handled = 0;
+
+	lp = netdev_priv(dev);
+
+	/* we MUST read all the events out of the ISQ, otherwise we'll never
+	 * get interrupted again.  As a consequence, we can't have any limit
+	 * on the number of times we loop in the interrupt handler.  The
+	 * hardware guarantees that eventually we'll run out of events.  Of
+	 * course, if you're on a slow machine, and packets are arriving
+	 * faster than you can read them off, you're screwed.  Hasta la
+	 * vista, baby!
+	 */
+	while ((status = ioread16(lp->virt_addr + ISQ_PORT))) {
+		cs89_dbg(4, debug, "%s: event=%04x\n", dev->name, status);
+		handled = 1;
+		switch (status & ISQ_EVENT_MASK) {
+		case ISQ_RECEIVER_EVENT:
+			/* Got a packet(s). */
+			net_rx(dev);
+			break;
+		case ISQ_TRANSMITTER_EVENT:
+			dev->stats.tx_packets++;
+			netif_wake_queue(dev);	/* Inform upper layers. */
+			if ((status & (TX_OK |
+				       TX_LOST_CRS |
+				       TX_SQE_ERROR |
+				       TX_LATE_COL |
+				       TX_16_COL)) != TX_OK) {
+				if ((status & TX_OK) == 0)
+					dev->stats.tx_errors++;
+				if (status & TX_LOST_CRS)
+					dev->stats.tx_carrier_errors++;
+				if (status & TX_SQE_ERROR)
+					dev->stats.tx_heartbeat_errors++;
+				if (status & TX_LATE_COL)
+					dev->stats.tx_window_errors++;
+				if (status & TX_16_COL)
+					dev->stats.tx_aborted_errors++;
+			}
+			break;
+		case ISQ_BUFFER_EVENT:
+			if (status & READY_FOR_TX) {
+				/* we tried to transmit a packet earlier,
+				 * but inexplicably ran out of buffers.
+				 * That shouldn't happen since we only ever
+				 * load one packet.  Shrug.  Do the right
+				 * thing anyway.
+				 */
+				netif_wake_queue(dev);	/* Inform upper layers. */
+			}
+			if (status & TX_UNDERRUN) {
+				cs89_dbg(0, err, "%s: transmit underrun\n",
+					 dev->name);
+				lp->send_underrun++;
+				if (lp->send_underrun == 3)
+					lp->send_cmd = TX_AFTER_381;
+				else if (lp->send_underrun == 6)
+					lp->send_cmd = TX_AFTER_ALL;
+				/* transmit cycle is done, although
+				 * frame wasn't transmitted - this
+				 * avoids having to wait for the upper
+				 * layers to timeout on us, in the
+				 * event of a tx underrun
+				 */
+				netif_wake_queue(dev);	/* Inform upper layers. */
+			}
+#if ALLOW_DMA
+			if (lp->use_dma && (status & RX_DMA)) {
+				int count = readreg(dev, PP_DmaFrameCnt);
+				while (count) {
+					cs89_dbg(5, debug,
+						 "%s: receiving %d DMA frames\n",
+						 dev->name, count);
+					if (count > 1)
+						cs89_dbg(2, debug,
+							 "%s: receiving %d DMA frames\n",
+							 dev->name, count);
+					dma_rx(dev);
+					if (--count == 0)
+						count = readreg(dev, PP_DmaFrameCnt);
+					if (count > 0)
+						cs89_dbg(2, debug,
+							 "%s: continuing with %d DMA frames\n",
+							 dev->name, count);
+				}
+			}
+#endif
+			break;
+		case ISQ_RX_MISS_EVENT:
+			dev->stats.rx_missed_errors += (status >> 6);
+			break;
+		case ISQ_TX_COL_EVENT:
+			dev->stats.collisions += (status >> 6);
+			break;
+		}
+	}
+	return IRQ_RETVAL(handled);
+}
+
+/* Open/initialize the board.  This is called (in the current kernel)
+   sometime after booting when the 'ifconfig' program is run.
+
+   This routine should set everything up anew at each open, even
+   registers that "should" only need to be set once at boot, so that
+   there is non-reboot way to recover if something goes wrong.
+*/
+
+/* AKPM: do we need to do any locking here? */
+
+static int
+net_open(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	int result = 0;
+	int i;
+	int ret;
+
+	if (dev->irq < 2) {
+		/* Allow interrupts to be generated by the chip */
+/* Cirrus' release had this: */
+#if 0
+		writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
+#endif
+/* And 2.3.47 had this: */
+		writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
+
+		for (i = 2; i < CS8920_NO_INTS; i++) {
+			if ((1 << i) & lp->irq_map) {
+				if (request_irq(i, net_interrupt, 0, dev->name,
+						dev) == 0) {
+					dev->irq = i;
+					write_irq(dev, lp->chip_type, i);
+					/* writereg(dev, PP_BufCFG, GENERATE_SW_INTERRUPT); */
+					break;
+				}
+			}
+		}
+
+		if (i >= CS8920_NO_INTS) {
+			writereg(dev, PP_BusCTL, 0);	/* disable interrupts. */
+			pr_err("can't get an interrupt\n");
+			ret = -EAGAIN;
+			goto bad_out;
+		}
+	} else {
+#if IS_ENABLED(CONFIG_CS89x0_ISA)
+		if (((1 << dev->irq) & lp->irq_map) == 0) {
+			pr_err("%s: IRQ %d is not in our map of allowable IRQs, which is %x\n",
+			       dev->name, dev->irq, lp->irq_map);
+			ret = -EAGAIN;
+			goto bad_out;
+		}
+#endif
+/* FIXME: Cirrus' release had this: */
+		writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL)|ENABLE_IRQ);
+/* And 2.3.47 had this: */
+#if 0
+		writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
+#endif
+		write_irq(dev, lp->chip_type, dev->irq);
+		ret = request_irq(dev->irq, net_interrupt, 0, dev->name, dev);
+		if (ret) {
+			pr_err("request_irq(%d) failed\n", dev->irq);
+			goto bad_out;
+		}
+	}
+
+#if ALLOW_DMA
+	if (lp->use_dma && (lp->isa_config & ANY_ISA_DMA)) {
+		unsigned long flags;
+		lp->dma_buff = (unsigned char *)__get_dma_pages(GFP_KERNEL,
+								get_order(lp->dmasize * 1024));
+		if (!lp->dma_buff) {
+			pr_err("%s: cannot get %dK memory for DMA\n",
+			       dev->name, lp->dmasize);
+			goto release_irq;
+		}
+		cs89_dbg(1, debug, "%s: dma %lx %lx\n",
+			 dev->name,
+			 (unsigned long)lp->dma_buff,
+			 (unsigned long)isa_virt_to_bus(lp->dma_buff));
+		if ((unsigned long)lp->dma_buff >= MAX_DMA_ADDRESS ||
+		    !dma_page_eq(lp->dma_buff,
+				 lp->dma_buff + lp->dmasize * 1024 - 1)) {
+			pr_err("%s: not usable as DMA buffer\n", dev->name);
+			goto release_irq;
+		}
+		memset(lp->dma_buff, 0, lp->dmasize * 1024);	/* Why? */
+		if (request_dma(dev->dma, dev->name)) {
+			pr_err("%s: cannot get dma channel %d\n",
+			       dev->name, dev->dma);
+			goto release_irq;
+		}
+		write_dma(dev, lp->chip_type, dev->dma);
+		lp->rx_dma_ptr = lp->dma_buff;
+		lp->end_dma_buff = lp->dma_buff + lp->dmasize * 1024;
+		spin_lock_irqsave(&lp->lock, flags);
+		disable_dma(dev->dma);
+		clear_dma_ff(dev->dma);
+		set_dma_mode(dev->dma, DMA_RX_MODE); /* auto_init as well */
+		set_dma_addr(dev->dma, isa_virt_to_bus(lp->dma_buff));
+		set_dma_count(dev->dma, lp->dmasize * 1024);
+		enable_dma(dev->dma);
+		spin_unlock_irqrestore(&lp->lock, flags);
+	}
+#endif	/* ALLOW_DMA */
+
+	/* set the Ethernet address */
+	for (i = 0; i < ETH_ALEN / 2; i++)
+		writereg(dev, PP_IA + i * 2,
+			 (dev->dev_addr[i * 2] |
+			  (dev->dev_addr[i * 2 + 1] << 8)));
+
+	/* while we're testing the interface, leave interrupts disabled */
+	writereg(dev, PP_BusCTL, MEMORY_ON);
+
+	/* Set the LineCTL quintuplet based on adapter configuration read from EEPROM */
+	if ((lp->adapter_cnf & A_CNF_EXTND_10B_2) &&
+	    (lp->adapter_cnf & A_CNF_LOW_RX_SQUELCH))
+		lp->linectl = LOW_RX_SQUELCH;
+	else
+		lp->linectl = 0;
+
+	/* check to make sure that they have the "right" hardware available */
+	switch (lp->adapter_cnf & A_CNF_MEDIA_TYPE) {
+	case A_CNF_MEDIA_10B_T:
+		result = lp->adapter_cnf & A_CNF_10B_T;
+		break;
+	case A_CNF_MEDIA_AUI:
+		result = lp->adapter_cnf & A_CNF_AUI;
+		break;
+	case A_CNF_MEDIA_10B_2:
+		result = lp->adapter_cnf & A_CNF_10B_2;
+		break;
+	default:
+		result = lp->adapter_cnf & (A_CNF_10B_T |
+					    A_CNF_AUI |
+					    A_CNF_10B_2);
+	}
+	if (!result) {
+		pr_err("%s: EEPROM is configured for unavailable media\n",
+		       dev->name);
+release_dma:
+#if ALLOW_DMA
+		free_dma(dev->dma);
+release_irq:
+		release_dma_buff(lp);
+#endif
+		writereg(dev, PP_LineCTL,
+			 readreg(dev, PP_LineCTL) & ~(SERIAL_TX_ON | SERIAL_RX_ON));
+		free_irq(dev->irq, dev);
+		ret = -EAGAIN;
+		goto bad_out;
+	}
+
+	/* set the hardware to the configured choice */
+	switch (lp->adapter_cnf & A_CNF_MEDIA_TYPE) {
+	case A_CNF_MEDIA_10B_T:
+		result = detect_tp(dev);
+		if (result == DETECTED_NONE) {
+			pr_warn("%s: 10Base-T (RJ-45) has no cable\n",
+				dev->name);
+			if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
+				result = DETECTED_RJ45H; /* Yes! I don't care if I see a link pulse */
+		}
+		break;
+	case A_CNF_MEDIA_AUI:
+		result = detect_aui(dev);
+		if (result == DETECTED_NONE) {
+			pr_warn("%s: 10Base-5 (AUI) has no cable\n", dev->name);
+			if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
+				result = DETECTED_AUI; /* Yes! I don't care if I see a carrier */
+		}
+		break;
+	case A_CNF_MEDIA_10B_2:
+		result = detect_bnc(dev);
+		if (result == DETECTED_NONE) {
+			pr_warn("%s: 10Base-2 (BNC) has no cable\n", dev->name);
+			if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
+				result = DETECTED_BNC; /* Yes! I don't care if I can xmit a packet */
+		}
+		break;
+	case A_CNF_MEDIA_AUTO:
+		writereg(dev, PP_LineCTL, lp->linectl | AUTO_AUI_10BASET);
+		if (lp->adapter_cnf & A_CNF_10B_T) {
+			result = detect_tp(dev);
+			if (result != DETECTED_NONE)
+				break;
+		}
+		if (lp->adapter_cnf & A_CNF_AUI) {
+			result = detect_aui(dev);
+			if (result != DETECTED_NONE)
+				break;
+		}
+		if (lp->adapter_cnf & A_CNF_10B_2) {
+			result = detect_bnc(dev);
+			if (result != DETECTED_NONE)
+				break;
+		}
+		pr_err("%s: no media detected\n", dev->name);
+		goto release_dma;
+	}
+	switch (result) {
+	case DETECTED_NONE:
+		pr_err("%s: no network cable attached to configured media\n",
+		       dev->name);
+		goto release_dma;
+	case DETECTED_RJ45H:
+		pr_info("%s: using half-duplex 10Base-T (RJ-45)\n", dev->name);
+		break;
+	case DETECTED_RJ45F:
+		pr_info("%s: using full-duplex 10Base-T (RJ-45)\n", dev->name);
+		break;
+	case DETECTED_AUI:
+		pr_info("%s: using 10Base-5 (AUI)\n", dev->name);
+		break;
+	case DETECTED_BNC:
+		pr_info("%s: using 10Base-2 (BNC)\n", dev->name);
+		break;
+	}
+
+	/* Turn on both receive and transmit operations */
+	writereg(dev, PP_LineCTL,
+		 readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);
+
+	/* Receive only error free packets addressed to this card */
+	lp->rx_mode = 0;
+	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);
+
+	lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;
+
+	if (lp->isa_config & STREAM_TRANSFER)
+		lp->curr_rx_cfg |= RX_STREAM_ENBL;
+#if ALLOW_DMA
+	set_dma_cfg(dev);
+#endif
+	writereg(dev, PP_RxCFG, lp->curr_rx_cfg);
+
+	writereg(dev, PP_TxCFG, (TX_LOST_CRS_ENBL |
+				 TX_SQE_ERROR_ENBL |
+				 TX_OK_ENBL |
+				 TX_LATE_COL_ENBL |
+				 TX_JBR_ENBL |
+				 TX_ANY_COL_ENBL |
+				 TX_16_COL_ENBL));
+
+	writereg(dev, PP_BufCFG, (READY_FOR_TX_ENBL |
+				  RX_MISS_COUNT_OVRFLOW_ENBL |
+#if ALLOW_DMA
+				  dma_bufcfg(dev) |
+#endif
+				  TX_COL_COUNT_OVRFLOW_ENBL |
+				  TX_UNDERRUN_ENBL));
+
+	/* now that we've got our act together, enable everything */
+	writereg(dev, PP_BusCTL, (ENABLE_IRQ
+				  | (dev->mem_start ? MEMORY_ON : 0) /* turn memory on */
+#if ALLOW_DMA
+				  | dma_busctl(dev)
+#endif
+			 ));
+	netif_start_queue(dev);
+	cs89_dbg(1, debug, "net_open() succeeded\n");
+	return 0;
+bad_out:
+	return ret;
+}
+
+/* The inverse routine to net_open(). */
+static int
+net_close(struct net_device *dev)
+{
+#if ALLOW_DMA
+	struct net_local *lp = netdev_priv(dev);
+#endif
+
+	netif_stop_queue(dev);
+
+	writereg(dev, PP_RxCFG, 0);
+	writereg(dev, PP_TxCFG, 0);
+	writereg(dev, PP_BufCFG, 0);
+	writereg(dev, PP_BusCTL, 0);
+
+	free_irq(dev->irq, dev);
+
+#if ALLOW_DMA
+	if (lp->use_dma && lp->dma) {
+		free_dma(dev->dma);
+		release_dma_buff(lp);
+	}
+#endif
+
+	/* Update the statistics here. */
+	return 0;
+}
+
+/* Get the current statistics.
+ * This may be called with the card open or closed.
+ */
+static struct net_device_stats *
+net_get_stats(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&lp->lock, flags);
+	/* Update the statistics from the device registers. */
+	dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
+	dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
+	spin_unlock_irqrestore(&lp->lock, flags);
+
+	return &dev->stats;
+}
+
+static void net_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	/* If we get here, some higher level has decided we are broken.
+	   There should really be a "kick me" function call instead. */
+	cs89_dbg(0, err, "%s: transmit timed out, %s?\n",
+		 dev->name,
+		 tx_done(dev) ? "IRQ conflict" : "network cable problem");
+	/* Try to restart the adaptor. */
+	netif_wake_queue(dev);
+}
+
+static netdev_tx_t net_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	unsigned long flags;
+
+	cs89_dbg(3, debug, "%s: sent %d byte packet of type %x\n",
+		 dev->name, skb->len,
+		 ((skb->data[ETH_ALEN + ETH_ALEN] << 8) |
+		  skb->data[ETH_ALEN + ETH_ALEN + 1]));
+
+	/* keep the upload from being interrupted, since we
+	 * ask the chip to start transmitting before the
+	 * whole packet has been completely uploaded.
+	 */
+
+	spin_lock_irqsave(&lp->lock, flags);
+	netif_stop_queue(dev);
+
+	/* initiate a transmit sequence */
+	iowrite16(lp->send_cmd, lp->virt_addr + TX_CMD_PORT);
+	iowrite16(skb->len, lp->virt_addr + TX_LEN_PORT);
+
+	/* Test to see if the chip has allocated memory for the packet */
+	if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
+		/* Gasp!  It hasn't.  But that shouldn't happen since
+		 * we're waiting for TxOk, so return 1 and requeue this packet.
+		 */
+
+		spin_unlock_irqrestore(&lp->lock, flags);
+		cs89_dbg(0, err, "Tx buffer not free!\n");
+		return NETDEV_TX_BUSY;
+	}
+	/* Write the contents of the packet */
+	writewords(lp, TX_FRAME_PORT, skb->data, (skb->len + 1) >> 1);
+	spin_unlock_irqrestore(&lp->lock, flags);
+	dev->stats.tx_bytes += skb->len;
+	dev_consume_skb_any(skb);
+
+	/* We DO NOT call netif_wake_queue() here.
+	 * We also DO NOT call netif_start_queue().
+	 *
+	 * Either of these would cause another bottom half run through
+	 * net_send_packet() before this packet has fully gone out.
+	 * That causes us to hit the "Gasp!" above and the send is rescheduled.
+	 * it runs like a dog.  We just return and wait for the Tx completion
+	 * interrupt handler to restart the netdevice layer
+	 */
+
+	return NETDEV_TX_OK;
+}
+
+static void set_multicast_list(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	unsigned long flags;
+	u16 cfg;
+
+	spin_lock_irqsave(&lp->lock, flags);
+	if (dev->flags & IFF_PROMISC)
+		lp->rx_mode = RX_ALL_ACCEPT;
+	else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
+		/* The multicast-accept list is initialized to accept-all,
+		 * and we rely on higher-level filtering for now.
+		 */
+		lp->rx_mode = RX_MULTCAST_ACCEPT;
+	else
+		lp->rx_mode = 0;
+
+	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);
+
+	/* in promiscuous mode, we accept errored packets,
+	 * so we have to enable interrupts on them also
+	 */
+	cfg = lp->curr_rx_cfg;
+	if (lp->rx_mode == RX_ALL_ACCEPT)
+		cfg |= RX_CRC_ERROR_ENBL | RX_RUNT_ENBL | RX_EXTRA_DATA_ENBL;
+	writereg(dev, PP_RxCFG, cfg);
+	spin_unlock_irqrestore(&lp->lock, flags);
+}
+
+static int set_mac_address(struct net_device *dev, void *p)
+{
+	int i;
+	struct sockaddr *addr = p;
+
+	if (netif_running(dev))
+		return -EBUSY;
+
+	eth_hw_addr_set(dev, addr->sa_data);
+
+	cs89_dbg(0, debug, "%s: Setting MAC address to %pM\n",
+		 dev->name, dev->dev_addr);
+
+	/* set the Ethernet address */
+	for (i = 0; i < ETH_ALEN / 2; i++)
+		writereg(dev, PP_IA + i * 2,
+			 (dev->dev_addr[i * 2] |
+			  (dev->dev_addr[i * 2 + 1] << 8)));
+
+	return 0;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling receive - used by netconsole and other diagnostic tools
+ * to allow network i/o with interrupts disabled.
+ */
+static void net_poll_controller(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	net_interrupt(dev->irq, dev);
+	enable_irq(dev->irq);
+}
+#endif
+
+static const struct net_device_ops net_ops = {
+	.ndo_open		= net_open,
+	.ndo_stop		= net_close,
+	.ndo_tx_timeout		= net_timeout,
+	.ndo_start_xmit		= net_send_packet,
+	.ndo_get_stats		= net_get_stats,
+	.ndo_set_rx_mode	= set_multicast_list,
+	.ndo_set_mac_address	= set_mac_address,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= net_poll_controller,
+#endif
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+static void __init reset_chip(struct net_device *dev)
+{
+#if !defined(CONFIG_MACH_MX31ADS)
+	struct net_local *lp = netdev_priv(dev);
+	unsigned long reset_start_time;
+
+	writereg(dev, PP_SelfCTL, readreg(dev, PP_SelfCTL) | POWER_ON_RESET);
+
+	/* wait 30 ms */
+	msleep(30);
+
+	if (lp->chip_type != CS8900) {
+		/* Hardware problem requires PNP registers to be reconfigured after a reset */
+		iowrite16(PP_CS8920_ISAINT, lp->virt_addr + ADD_PORT);
+		iowrite8(dev->irq, lp->virt_addr + DATA_PORT);
+		iowrite8(0, lp->virt_addr + DATA_PORT + 1);
+
+		iowrite16(PP_CS8920_ISAMemB, lp->virt_addr + ADD_PORT);
+		iowrite8((dev->mem_start >> 16) & 0xff,
+			 lp->virt_addr + DATA_PORT);
+		iowrite8((dev->mem_start >> 8) & 0xff,
+			 lp->virt_addr + DATA_PORT + 1);
+	}
+
+	/* Wait until the chip is reset */
+	reset_start_time = jiffies;
+	while ((readreg(dev, PP_SelfST) & INIT_DONE) == 0 &&
+	       time_before(jiffies, reset_start_time + 2))
+		;
+#endif /* !CONFIG_MACH_MX31ADS */
+}
+
+/* This is the real probe routine.
+ * Linux has a history of friendly device probes on the ISA bus.
+ * A good device probes avoids doing writes, and
+ * verifies that the correct device exists and functions.
+ * Return 0 on success.
+ */
+static int __init
+cs89x0_probe1(struct net_device *dev, void __iomem *ioaddr, int modular)
+{
+	struct net_local *lp = netdev_priv(dev);
+	int i;
+	int tmp;
+	unsigned rev_type = 0;
+	int eeprom_buff[CHKSUM_LEN];
+	u8 addr[ETH_ALEN];
+	int retval;
+
+	/* Initialize the device structure. */
+	if (!modular) {
+		memset(lp, 0, sizeof(*lp));
+		spin_lock_init(&lp->lock);
+#ifndef MODULE
+#if ALLOW_DMA
+		if (g_cs89x0_dma) {
+			lp->use_dma = 1;
+			lp->dma = g_cs89x0_dma;
+			lp->dmasize = 16;	/* Could make this an option... */
+		}
+#endif
+		lp->force = g_cs89x0_media__force;
+#endif
+	}
+
+	pr_debug("PP_addr at %p[%x]: 0x%x\n",
+		 ioaddr, ADD_PORT, ioread16(ioaddr + ADD_PORT));
+	iowrite16(PP_ChipID, ioaddr + ADD_PORT);
+
+	tmp = ioread16(ioaddr + DATA_PORT);
+	if (tmp != CHIP_EISA_ID_SIG) {
+		pr_debug("%s: incorrect signature at %p[%x]: 0x%x!="
+			 CHIP_EISA_ID_SIG_STR "\n",
+			 dev->name, ioaddr, DATA_PORT, tmp);
+		retval = -ENODEV;
+		goto out1;
+	}
+
+	lp->virt_addr = ioaddr;
+
+	/* get the chip type */
+	rev_type = readreg(dev, PRODUCT_ID_ADD);
+	lp->chip_type = rev_type & ~REVISON_BITS;
+	lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
+
+	/* Check the chip type and revision in order to set the correct
+	 * send command.  CS8920 revision C and CS8900 revision F can use
+	 * the faster send.
+	 */
+	lp->send_cmd = TX_AFTER_381;
+	if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
+		lp->send_cmd = TX_NOW;
+	if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
+		lp->send_cmd = TX_NOW;
+
+	pr_info_once("%s\n", version);
+
+	pr_info("%s: cs89%c0%s rev %c found at %p ",
+		dev->name,
+		lp->chip_type == CS8900  ? '0' : '2',
+		lp->chip_type == CS8920M ? "M" : "",
+		lp->chip_revision,
+		lp->virt_addr);
+
+	reset_chip(dev);
+
+	/* Here we read the current configuration of the chip.
+	 * If there is no Extended EEPROM then the idea is to not disturb
+	 * the chip configuration, it should have been correctly setup by
+	 * automatic EEPROM read on reset. So, if the chip says it read
+	 * the EEPROM the driver will always do *something* instead of
+	 * complain that adapter_cnf is 0.
+	 */
+
+	if ((readreg(dev, PP_SelfST) & (EEPROM_OK | EEPROM_PRESENT)) ==
+	    (EEPROM_OK | EEPROM_PRESENT)) {
+		/* Load the MAC. */
+		for (i = 0; i < ETH_ALEN / 2; i++) {
+			unsigned int Addr;
+			Addr = readreg(dev, PP_IA + i * 2);
+			addr[i * 2] = Addr & 0xFF;
+			addr[i * 2 + 1] = Addr >> 8;
+		}
+		eth_hw_addr_set(dev, addr);
+
+		/* Load the Adapter Configuration.
+		 * Note:  Barring any more specific information from some
+		 * other source (ie EEPROM+Schematics), we would not know
+		 * how to operate a 10Base2 interface on the AUI port.
+		 * However, since we  do read the status of HCB1 and use
+		 * settings that always result in calls to control_dc_dc(dev,0)
+		 * a BNC interface should work if the enable pin
+		 * (dc/dc converter) is on HCB1.
+		 * It will be called AUI however.
+		 */
+
+		lp->adapter_cnf = 0;
+		i = readreg(dev, PP_LineCTL);
+		/* Preserve the setting of the HCB1 pin. */
+		if ((i & (HCB1 | HCB1_ENBL)) == (HCB1 | HCB1_ENBL))
+			lp->adapter_cnf |= A_CNF_DC_DC_POLARITY;
+		/* Save the sqelch bit */
+		if ((i & LOW_RX_SQUELCH) == LOW_RX_SQUELCH)
+			lp->adapter_cnf |= A_CNF_EXTND_10B_2 | A_CNF_LOW_RX_SQUELCH;
+		/* Check if the card is in 10Base-t only mode */
+		if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == 0)
+			lp->adapter_cnf |=  A_CNF_10B_T | A_CNF_MEDIA_10B_T;
+		/* Check if the card is in AUI only mode */
+		if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == AUI_ONLY)
+			lp->adapter_cnf |=  A_CNF_AUI | A_CNF_MEDIA_AUI;
+		/* Check if the card is in Auto mode. */
+		if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == AUTO_AUI_10BASET)
+			lp->adapter_cnf |=  A_CNF_AUI | A_CNF_10B_T |
+				A_CNF_MEDIA_AUI | A_CNF_MEDIA_10B_T | A_CNF_MEDIA_AUTO;
+
+		cs89_dbg(1, info, "%s: PP_LineCTL=0x%x, adapter_cnf=0x%x\n",
+			 dev->name, i, lp->adapter_cnf);
+
+		/* IRQ. Other chips already probe, see below. */
+		if (lp->chip_type == CS8900)
+			lp->isa_config = readreg(dev, PP_CS8900_ISAINT) & INT_NO_MASK;
+
+		pr_cont("[Cirrus EEPROM] ");
+	}
+
+	pr_cont("\n");
+
+	/* First check to see if an EEPROM is attached. */
+
+	if ((readreg(dev, PP_SelfST) & EEPROM_PRESENT) == 0)
+		pr_warn("No EEPROM, relying on command line....\n");
+	else if (get_eeprom_data(dev, START_EEPROM_DATA, CHKSUM_LEN, eeprom_buff) < 0) {
+		pr_warn("EEPROM read failed, relying on command line\n");
+	} else if (get_eeprom_cksum(START_EEPROM_DATA, CHKSUM_LEN, eeprom_buff) < 0) {
+		/* Check if the chip was able to read its own configuration starting
+		   at 0 in the EEPROM*/
+		if ((readreg(dev, PP_SelfST) & (EEPROM_OK | EEPROM_PRESENT)) !=
+		    (EEPROM_OK | EEPROM_PRESENT))
+			pr_warn("Extended EEPROM checksum bad and no Cirrus EEPROM, relying on command line\n");
+
+	} else {
+		/* This reads an extended EEPROM that is not documented
+		 * in the CS8900 datasheet.
+		 */
+
+		/* get transmission control word  but keep the autonegotiation bits */
+		if (!lp->auto_neg_cnf)
+			lp->auto_neg_cnf = eeprom_buff[AUTO_NEG_CNF_OFFSET / 2];
+		/* Store adapter configuration */
+		if (!lp->adapter_cnf)
+			lp->adapter_cnf = eeprom_buff[ADAPTER_CNF_OFFSET / 2];
+		/* Store ISA configuration */
+		lp->isa_config = eeprom_buff[ISA_CNF_OFFSET / 2];
+		dev->mem_start = eeprom_buff[PACKET_PAGE_OFFSET / 2] << 8;
+
+		/* eeprom_buff has 32-bit ints, so we can't just memcpy it */
+		/* store the initial memory base address */
+		for (i = 0; i < ETH_ALEN / 2; i++) {
+			addr[i * 2] = eeprom_buff[i];
+			addr[i * 2 + 1] = eeprom_buff[i] >> 8;
+		}
+		eth_hw_addr_set(dev, addr);
+		cs89_dbg(1, debug, "%s: new adapter_cnf: 0x%x\n",
+			 dev->name, lp->adapter_cnf);
+	}
+
+	/* allow them to force multiple transceivers.  If they force multiple, autosense */
+	{
+		int count = 0;
+		if (lp->force & FORCE_RJ45) {
+			lp->adapter_cnf |= A_CNF_10B_T;
+			count++;
+		}
+		if (lp->force & FORCE_AUI) {
+			lp->adapter_cnf |= A_CNF_AUI;
+			count++;
+		}
+		if (lp->force & FORCE_BNC) {
+			lp->adapter_cnf |= A_CNF_10B_2;
+			count++;
+		}
+		if (count > 1)
+			lp->adapter_cnf |= A_CNF_MEDIA_AUTO;
+		else if (lp->force & FORCE_RJ45)
+			lp->adapter_cnf |= A_CNF_MEDIA_10B_T;
+		else if (lp->force & FORCE_AUI)
+			lp->adapter_cnf |= A_CNF_MEDIA_AUI;
+		else if (lp->force & FORCE_BNC)
+			lp->adapter_cnf |= A_CNF_MEDIA_10B_2;
+	}
+
+	cs89_dbg(1, debug, "%s: after force 0x%x, adapter_cnf=0x%x\n",
+		 dev->name, lp->force, lp->adapter_cnf);
+
+	/* FIXME: We don't let you set dc-dc polarity or low RX squelch from the command line: add it here */
+
+	/* FIXME: We don't let you set the IMM bit from the command line: add it to lp->auto_neg_cnf here */
+
+	/* FIXME: we don't set the Ethernet address on the command line.  Use
+	 * ifconfig IFACE hw ether AABBCCDDEEFF
+	 */
+
+	pr_info("media %s%s%s",
+		(lp->adapter_cnf & A_CNF_10B_T) ? "RJ-45," : "",
+		(lp->adapter_cnf & A_CNF_AUI) ? "AUI," : "",
+		(lp->adapter_cnf & A_CNF_10B_2) ? "BNC," : "");
+
+	lp->irq_map = 0xffff;
+
+	/* If this is a CS8900 then no pnp soft */
+	if (lp->chip_type != CS8900 &&
+	    /* Check if the ISA IRQ has been set  */
+	    (i = readreg(dev, PP_CS8920_ISAINT) & 0xff,
+	     (i != 0 && i < CS8920_NO_INTS))) {
+		if (!dev->irq)
+			dev->irq = i;
+	} else {
+		i = lp->isa_config & INT_NO_MASK;
+#if IS_ENABLED(CONFIG_CS89x0_ISA)
+		if (lp->chip_type == CS8900) {
+			/* Translate the IRQ using the IRQ mapping table. */
+			if (i >= ARRAY_SIZE(cs8900_irq_map))
+				pr_err("invalid ISA interrupt number %d\n", i);
+			else
+				i = cs8900_irq_map[i];
+
+			lp->irq_map = CS8900_IRQ_MAP; /* fixed IRQ map for CS8900 */
+		} else {
+			int irq_map_buff[IRQ_MAP_LEN/2];
+
+			if (get_eeprom_data(dev, IRQ_MAP_EEPROM_DATA,
+					    IRQ_MAP_LEN / 2,
+					    irq_map_buff) >= 0) {
+				if ((irq_map_buff[0] & 0xff) == PNP_IRQ_FRMT)
+					lp->irq_map = ((irq_map_buff[0] >> 8) |
+						       (irq_map_buff[1] << 8));
+			}
+		}
+#endif
+		if (!dev->irq)
+			dev->irq = i;
+	}
+
+	pr_cont(" IRQ %d", dev->irq);
+
+#if ALLOW_DMA
+	if (lp->use_dma) {
+		get_dma_channel(dev);
+		pr_cont(", DMA %d", dev->dma);
+	} else
+#endif
+		pr_cont(", programmed I/O");
+
+	/* print the ethernet address. */
+	pr_cont(", MAC %pM\n", dev->dev_addr);
+
+	dev->netdev_ops	= &net_ops;
+	dev->watchdog_timeo = HZ;
+
+	cs89_dbg(0, info, "cs89x0_probe1() successful\n");
+
+	retval = register_netdev(dev);
+	if (retval)
+		goto out2;
+	return 0;
+out2:
+	iowrite16(PP_ChipID, lp->virt_addr + ADD_PORT);
+out1:
+	return retval;
+}
+
+#if IS_ENABLED(CONFIG_CS89x0_ISA)
+/*
+ * This function converts the I/O port address used by the cs89x0_probe() and
+ * init_module() functions to the I/O memory address used by the
+ * cs89x0_probe1() function.
+ */
+static int __init
+cs89x0_ioport_probe(struct net_device *dev, unsigned long ioport, int modular)
+{
+	struct net_local *lp = netdev_priv(dev);
+	int ret;
+	void __iomem *io_mem;
+
+	if (!lp)
+		return -ENOMEM;
+
+	dev->base_addr = ioport;
+
+	if (!request_region(ioport, NETCARD_IO_EXTENT, DRV_NAME)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	io_mem = ioport_map(ioport & ~3, NETCARD_IO_EXTENT);
+	if (!io_mem) {
+		ret = -ENOMEM;
+		goto release;
+	}
+
+	/* if they give us an odd I/O address, then do ONE write to
+	 * the address port, to get it back to address zero, where we
+	 * expect to find the EISA signature word. An IO with a base of 0x3
+	 * will skip the test for the ADD_PORT.
+	 */
+	if (ioport & 1) {
+		cs89_dbg(1, info, "%s: odd ioaddr 0x%lx\n", dev->name, ioport);
+		if ((ioport & 2) != 2) {
+			if ((ioread16(io_mem + ADD_PORT) & ADD_MASK) !=
+			    ADD_SIG) {
+				pr_err("%s: bad signature 0x%x\n",
+				       dev->name, ioread16(io_mem + ADD_PORT));
+				ret = -ENODEV;
+				goto unmap;
+			}
+		}
+	}
+
+	ret = cs89x0_probe1(dev, io_mem, modular);
+	if (!ret)
+		goto out;
+unmap:
+	ioport_unmap(io_mem);
+release:
+	release_region(ioport, NETCARD_IO_EXTENT);
+out:
+	return ret;
+}
+
+#ifndef MODULE
+/* Check for a network adaptor of this type, and return '0' iff one exists.
+ * If dev->base_addr == 0, probe all likely locations.
+ * If dev->base_addr == 1, always return failure.
+ * If dev->base_addr == 2, allocate space for the device and return success
+ * (detachable devices only).
+ * Return 0 on success.
+ */
+
+struct net_device * __init cs89x0_probe(int unit)
+{
+	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
+	unsigned *port;
+	int err = 0;
+	int irq;
+	int io;
+
+	if (!dev)
+		return ERR_PTR(-ENODEV);
+
+	sprintf(dev->name, "eth%d", unit);
+	netdev_boot_setup_check(dev);
+	io = dev->base_addr;
+	irq = dev->irq;
+
+	cs89_dbg(0, info, "cs89x0_probe(0x%x)\n", io);
+
+	if (io > 0x1ff)	{	/* Check a single specified location. */
+		err = cs89x0_ioport_probe(dev, io, 0);
+	} else if (io != 0) {	/* Don't probe at all. */
+		err = -ENXIO;
+	} else {
+		for (port = netcard_portlist; *port; port++) {
+			if (cs89x0_ioport_probe(dev, *port, 0) == 0)
+				break;
+			dev->irq = irq;
+		}
+		if (!*port)
+			err = -ENODEV;
+	}
+	if (err)
+		goto out;
+	return dev;
+out:
+	free_netdev(dev);
+	pr_warn("no cs8900 or cs8920 detected.  Be sure to disable PnP with SETUP\n");
+	return ERR_PTR(err);
+}
+#else
+static struct net_device *dev_cs89x0;
+
+/* Support the 'debug' module parm even if we're compiled for non-debug to
+ * avoid breaking someone's startup scripts
+ */
+
+static int io;
+static int irq;
+static int debug;
+static char media[8];
+static int duplex = -1;
+
+static int use_dma;			/* These generate unused var warnings if ALLOW_DMA = 0 */
+static int dma;
+static int dmasize = 16;		/* or 64 */
+
+module_param_hw(io, int, ioport, 0);
+module_param_hw(irq, int, irq, 0);
+module_param(debug, int, 0);
+module_param_string(media, media, sizeof(media), 0);
+module_param(duplex, int, 0);
+module_param_hw(dma , int, dma, 0);
+module_param(dmasize , int, 0);
+module_param(use_dma , int, 0);
+MODULE_PARM_DESC(io, "cs89x0 I/O base address");
+MODULE_PARM_DESC(irq, "cs89x0 IRQ number");
+#if DEBUGGING
+MODULE_PARM_DESC(debug, "cs89x0 debug level (0-6)");
+#else
+MODULE_PARM_DESC(debug, "(ignored)");
+#endif
+MODULE_PARM_DESC(media, "Set cs89x0 adapter(s) media type(s) (rj45,bnc,aui)");
+/* No other value than -1 for duplex seems to be currently interpreted */
+MODULE_PARM_DESC(duplex, "(ignored)");
+#if ALLOW_DMA
+MODULE_PARM_DESC(dma , "cs89x0 ISA DMA channel; ignored if use_dma=0");
+MODULE_PARM_DESC(dmasize , "cs89x0 DMA size in kB (16,64); ignored if use_dma=0");
+MODULE_PARM_DESC(use_dma , "cs89x0 using DMA (0-1)");
+#else
+MODULE_PARM_DESC(dma , "(ignored)");
+MODULE_PARM_DESC(dmasize , "(ignored)");
+MODULE_PARM_DESC(use_dma , "(ignored)");
+#endif
+
+MODULE_AUTHOR("Mike Cruse, Russwll Nelson <nelson@crynwr.com>, Andrew Morton");
+MODULE_LICENSE("GPL");
+
+/*
+ * media=t             - specify media type
+ * or media=2
+ * or media=aui
+ * or medai=auto
+ * duplex=0            - specify forced half/full/autonegotiate duplex
+ * debug=#             - debug level
+ *
+ * Default Chip Configuration:
+ * DMA Burst = enabled
+ * IOCHRDY Enabled = enabled
+ * UseSA = enabled
+ * CS8900 defaults to half-duplex if not specified on command-line
+ * CS8920 defaults to autoneg if not specified on command-line
+ * Use reset defaults for other config parameters
+ *
+ * Assumptions:
+ * media type specified is supported (circuitry is present)
+ * if memory address is > 1MB, then required mem decode hw is present
+ * if 10B-2, then agent other than driver will enable DC/DC converter
+ * (hw or software util)
+ */
+
+static int __init cs89x0_isa_init_module(void)
+{
+	struct net_device *dev;
+	struct net_local *lp;
+	int ret = 0;
+
+#if DEBUGGING
+	net_debug = debug;
+#else
+	debug = 0;
+#endif
+	dev = alloc_etherdev(sizeof(struct net_local));
+	if (!dev)
+		return -ENOMEM;
+
+	dev->irq = irq;
+	dev->base_addr = io;
+	lp = netdev_priv(dev);
+
+#if ALLOW_DMA
+	if (use_dma) {
+		lp->use_dma = use_dma;
+		lp->dma = dma;
+		lp->dmasize = dmasize;
+	}
+#endif
+
+	spin_lock_init(&lp->lock);
+
+	/* boy, they'd better get these right */
+	if (!strcmp(media, "rj45"))
+		lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;
+	else if (!strcmp(media, "aui"))
+		lp->adapter_cnf = A_CNF_MEDIA_AUI   | A_CNF_AUI;
+	else if (!strcmp(media, "bnc"))
+		lp->adapter_cnf = A_CNF_MEDIA_10B_2 | A_CNF_10B_2;
+	else
+		lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;
+
+	if (duplex == -1)
+		lp->auto_neg_cnf = AUTO_NEG_ENABLE;
+
+	if (io == 0) {
+		pr_err("Module autoprobing not allowed\n");
+		pr_err("Append io=0xNNN\n");
+		ret = -EPERM;
+		goto out;
+	} else if (io <= 0x1ff) {
+		ret = -ENXIO;
+		goto out;
+	}
+
+#if ALLOW_DMA
+	if (use_dma && dmasize != 16 && dmasize != 64) {
+		pr_err("dma size must be either 16K or 64K, not %dK\n",
+		       dmasize);
+		ret = -EPERM;
+		goto out;
+	}
+#endif
+	ret = cs89x0_ioport_probe(dev, io, 1);
+	if (ret)
+		goto out;
+
+	dev_cs89x0 = dev;
+	return 0;
+out:
+	free_netdev(dev);
+	return ret;
+}
+module_init(cs89x0_isa_init_module);
+
+static void __exit cs89x0_isa_cleanup_module(void)
+{
+	struct net_local *lp = netdev_priv(dev_cs89x0);
+
+	unregister_netdev(dev_cs89x0);
+	iowrite16(PP_ChipID, lp->virt_addr + ADD_PORT);
+	ioport_unmap(lp->virt_addr);
+	release_region(dev_cs89x0->base_addr, NETCARD_IO_EXTENT);
+	free_netdev(dev_cs89x0);
+}
+module_exit(cs89x0_isa_cleanup_module);
+#endif /* MODULE */
+#endif /* CONFIG_CS89x0_ISA */
+
+#if IS_ENABLED(CONFIG_CS89x0_PLATFORM)
+static int __init cs89x0_platform_probe(struct platform_device *pdev)
+{
+	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
+	void __iomem *virt_addr;
+	int err;
+
+	if (!dev)
+		return -ENOMEM;
+
+	dev->irq = platform_get_irq(pdev, 0);
+	if (dev->irq < 0) {
+		err = dev->irq;
+		goto free;
+	}
+
+	virt_addr = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(virt_addr)) {
+		err = PTR_ERR(virt_addr);
+		goto free;
+	}
+
+	err = cs89x0_probe1(dev, virt_addr, 0);
+	if (err) {
+		dev_warn(&dev->dev, "no cs8900 or cs8920 detected\n");
+		goto free;
+	}
+
+	platform_set_drvdata(pdev, dev);
+	return 0;
+
+free:
+	free_netdev(dev);
+	return err;
+}
+
+static int cs89x0_platform_remove(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+
+	/* This platform_get_resource() call will not return NULL, because
+	 * the same call in cs89x0_platform_probe() has returned a non NULL
+	 * value.
+	 */
+	unregister_netdev(dev);
+	free_netdev(dev);
+	return 0;
+}
+
+static const struct of_device_id __maybe_unused cs89x0_match[] = {
+	{ .compatible = "cirrus,cs8900", },
+	{ .compatible = "cirrus,cs8920", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, cs89x0_match);
+
+static struct platform_driver cs89x0_driver = {
+	.driver	= {
+		.name		= DRV_NAME,
+		.of_match_table	= of_match_ptr(cs89x0_match),
+	},
+	.remove	= cs89x0_platform_remove,
+};
+
+module_platform_driver_probe(cs89x0_driver, cs89x0_platform_probe);
+
+#endif /* CONFIG_CS89x0_PLATFORM */
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Crystal Semiconductor (Now Cirrus Logic) CS89[02]0 network driver");
+MODULE_AUTHOR("Russell Nelson <nelson@crynwr.com>");
diff --git a/drivers/net/ethernet/cirrus/cs89x0.h b/drivers/net/ethernet/cirrus/cs89x0.h
new file mode 100644
index 0000000000..210f9ec9af
--- /dev/null
+++ b/drivers/net/ethernet/cirrus/cs89x0.h
@@ -0,0 +1,461 @@
+/*  Copyright, 1988-1992, Russell Nelson, Crynwr Software
+
+   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, version 1.
+
+   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., 675 Mass Ave, Cambridge, MA 02139, USA.
+   */
+
+
+#define PP_ChipID 0x0000	/* offset   0h -> Corp -ID              */
+				/* offset   2h -> Model/Product Number  */
+				/* offset   3h -> Chip Revision Number  */
+
+#define PP_ISAIOB 0x0020	/*  IO base address */
+#define PP_CS8900_ISAINT 0x0022	/*  ISA interrupt select */
+#define PP_CS8920_ISAINT 0x0370	/*  ISA interrupt select */
+#define PP_CS8900_ISADMA 0x0024	/*  ISA Rec DMA channel */
+#define PP_CS8920_ISADMA 0x0374	/*  ISA Rec DMA channel */
+#define PP_ISASOF 0x0026	/*  ISA DMA offset */
+#define PP_DmaFrameCnt 0x0028	/*  ISA DMA Frame count */
+#define PP_DmaByteCnt 0x002A	/*  ISA DMA Byte count */
+#define PP_CS8900_ISAMemB 0x002C	/*  Memory base */
+#define PP_CS8920_ISAMemB 0x0348 /*  */
+
+#define PP_ISABootBase 0x0030	/*  Boot Prom base  */
+#define PP_ISABootMask 0x0034	/*  Boot Prom Mask */
+
+/* EEPROM data and command registers */
+#define PP_EECMD 0x0040		/*  NVR Interface Command register */
+#define PP_EEData 0x0042	/*  NVR Interface Data Register */
+#define PP_DebugReg 0x0044	/*  Debug Register */
+
+#define PP_RxCFG 0x0102		/*  Rx Bus config */
+#define PP_RxCTL 0x0104		/*  Receive Control Register */
+#define PP_TxCFG 0x0106		/*  Transmit Config Register */
+#define PP_TxCMD 0x0108		/*  Transmit Command Register */
+#define PP_BufCFG 0x010A	/*  Bus configuration Register */
+#define PP_LineCTL 0x0112	/*  Line Config Register */
+#define PP_SelfCTL 0x0114	/*  Self Command Register */
+#define PP_BusCTL 0x0116	/*  ISA bus control Register */
+#define PP_TestCTL 0x0118	/*  Test Register */
+#define PP_AutoNegCTL 0x011C	/*  Auto Negotiation Ctrl */
+
+#define PP_ISQ 0x0120		/*  Interrupt Status */
+#define PP_RxEvent 0x0124	/*  Rx Event Register */
+#define PP_TxEvent 0x0128	/*  Tx Event Register */
+#define PP_BufEvent 0x012C	/*  Bus Event Register */
+#define PP_RxMiss 0x0130	/*  Receive Miss Count */
+#define PP_TxCol 0x0132		/*  Transmit Collision Count */
+#define PP_LineST 0x0134	/*  Line State Register */
+#define PP_SelfST 0x0136	/*  Self State register */
+#define PP_BusST 0x0138		/*  Bus Status */
+#define PP_TDR 0x013C		/*  Time Domain Reflectometry */
+#define PP_AutoNegST 0x013E	/*  Auto Neg Status */
+#define PP_TxCommand 0x0144	/*  Tx Command */
+#define PP_TxLength 0x0146	/*  Tx Length */
+#define PP_LAF 0x0150		/*  Hash Table */
+#define PP_IA 0x0158		/*  Physical Address Register */
+
+#define PP_RxStatus 0x0400	/*  Receive start of frame */
+#define PP_RxLength 0x0402	/*  Receive Length of frame */
+#define PP_RxFrame 0x0404	/*  Receive frame pointer */
+#define PP_TxFrame 0x0A00	/*  Transmit frame pointer */
+
+/*  Primary I/O Base Address. If no I/O base is supplied by the user, then this */
+/*  can be used as the default I/O base to access the PacketPage Area. */
+#define DEFAULTIOBASE 0x0300
+#define FIRST_IO 0x020C		/*  First I/O port to check */
+#define LAST_IO 0x037C		/*  Last I/O port to check (+10h) */
+#define ADD_MASK 0x3000		/*  Mask it use of the ADD_PORT register */
+#define ADD_SIG 0x3000		/*  Expected ID signature */
+
+/* On Macs, we only need use the ISA I/O stuff until we do MEMORY_ON */
+#ifdef CONFIG_MAC
+#define LCSLOTBASE 0xfee00000
+#define MMIOBASE 0x40000
+#endif
+
+#define CHIP_EISA_ID_SIG 0x630E   /*  Product ID Code for Crystal Chip (CS8900 spec 4.3) */
+#define CHIP_EISA_ID_SIG_STR "0x630E"
+
+#ifdef IBMEIPKT
+#define EISA_ID_SIG 0x4D24	/*  IBM */
+#define PART_NO_SIG 0x1010	/*  IBM */
+#define MONGOOSE_BIT 0x0000	/*  IBM */
+#else
+#define EISA_ID_SIG 0x630E	/*  PnP Vendor ID (same as chip id for Crystal board) */
+#define PART_NO_SIG 0x4000	/*  ID code CS8920 board (PnP Vendor Product code) */
+#define MONGOOSE_BIT 0x2000	/*  PART_NO_SIG + MONGOOSE_BUT => ID of mongoose */
+#endif
+
+#define PRODUCT_ID_ADD 0x0002   /*  Address of product ID */
+
+/*  Mask to find out the types of  registers */
+#define REG_TYPE_MASK 0x001F
+
+/*  Eeprom Commands */
+#define ERSE_WR_ENBL 0x00F0
+#define ERSE_WR_DISABLE 0x0000
+
+/*  Defines Control/Config register quintuplet numbers */
+#define RX_BUF_CFG 0x0003
+#define RX_CONTROL 0x0005
+#define TX_CFG 0x0007
+#define TX_COMMAND 0x0009
+#define BUF_CFG 0x000B
+#define LINE_CONTROL 0x0013
+#define SELF_CONTROL 0x0015
+#define BUS_CONTROL 0x0017
+#define TEST_CONTROL 0x0019
+
+/*  Defines Status/Count registers quintuplet numbers */
+#define RX_EVENT 0x0004
+#define TX_EVENT 0x0008
+#define BUF_EVENT 0x000C
+#define RX_MISS_COUNT 0x0010
+#define TX_COL_COUNT 0x0012
+#define LINE_STATUS 0x0014
+#define SELF_STATUS 0x0016
+#define BUS_STATUS 0x0018
+#define TDR 0x001C
+
+/* PP_RxCFG - Receive  Configuration and Interrupt Mask bit definition -  Read/write */
+#define SKIP_1 0x0040
+#define RX_STREAM_ENBL 0x0080
+#define RX_OK_ENBL 0x0100
+#define RX_DMA_ONLY 0x0200
+#define AUTO_RX_DMA 0x0400
+#define BUFFER_CRC 0x0800
+#define RX_CRC_ERROR_ENBL 0x1000
+#define RX_RUNT_ENBL 0x2000
+#define RX_EXTRA_DATA_ENBL 0x4000
+
+/* PP_RxCTL - Receive Control bit definition - Read/write */
+#define RX_IA_HASH_ACCEPT 0x0040
+#define RX_PROM_ACCEPT 0x0080
+#define RX_OK_ACCEPT 0x0100
+#define RX_MULTCAST_ACCEPT 0x0200
+#define RX_IA_ACCEPT 0x0400
+#define RX_BROADCAST_ACCEPT 0x0800
+#define RX_BAD_CRC_ACCEPT 0x1000
+#define RX_RUNT_ACCEPT 0x2000
+#define RX_EXTRA_DATA_ACCEPT 0x4000
+#define RX_ALL_ACCEPT (RX_PROM_ACCEPT|RX_BAD_CRC_ACCEPT|RX_RUNT_ACCEPT|RX_EXTRA_DATA_ACCEPT)
+/*  Default receive mode - individually addressed, broadcast, and error free */
+#define DEF_RX_ACCEPT (RX_IA_ACCEPT | RX_BROADCAST_ACCEPT | RX_OK_ACCEPT)
+
+/* PP_TxCFG - Transmit Configuration Interrupt Mask bit definition - Read/write */
+#define TX_LOST_CRS_ENBL 0x0040
+#define TX_SQE_ERROR_ENBL 0x0080
+#define TX_OK_ENBL 0x0100
+#define TX_LATE_COL_ENBL 0x0200
+#define TX_JBR_ENBL 0x0400
+#define TX_ANY_COL_ENBL 0x0800
+#define TX_16_COL_ENBL 0x8000
+
+/* PP_TxCMD - Transmit Command bit definition - Read-only */
+#define TX_START_4_BYTES 0x0000
+#define TX_START_64_BYTES 0x0040
+#define TX_START_128_BYTES 0x0080
+#define TX_START_ALL_BYTES 0x00C0
+#define TX_FORCE 0x0100
+#define TX_ONE_COL 0x0200
+#define TX_TWO_PART_DEFF_DISABLE 0x0400
+#define TX_NO_CRC 0x1000
+#define TX_RUNT 0x2000
+
+/* PP_BufCFG - Buffer Configuration Interrupt Mask bit definition - Read/write */
+#define GENERATE_SW_INTERRUPT 0x0040
+#define RX_DMA_ENBL 0x0080
+#define READY_FOR_TX_ENBL 0x0100
+#define TX_UNDERRUN_ENBL 0x0200
+#define RX_MISS_ENBL 0x0400
+#define RX_128_BYTE_ENBL 0x0800
+#define TX_COL_COUNT_OVRFLOW_ENBL 0x1000
+#define RX_MISS_COUNT_OVRFLOW_ENBL 0x2000
+#define RX_DEST_MATCH_ENBL 0x8000
+
+/* PP_LineCTL - Line Control bit definition - Read/write */
+#define SERIAL_RX_ON 0x0040
+#define SERIAL_TX_ON 0x0080
+#define AUI_ONLY 0x0100
+#define AUTO_AUI_10BASET 0x0200
+#define MODIFIED_BACKOFF 0x0800
+#define NO_AUTO_POLARITY 0x1000
+#define TWO_PART_DEFDIS 0x2000
+#define LOW_RX_SQUELCH 0x4000
+
+/* PP_SelfCTL - Software Self Control bit definition - Read/write */
+#define POWER_ON_RESET 0x0040
+#define SW_STOP 0x0100
+#define SLEEP_ON 0x0200
+#define AUTO_WAKEUP 0x0400
+#define HCB0_ENBL 0x1000
+#define HCB1_ENBL 0x2000
+#define HCB0 0x4000
+#define HCB1 0x8000
+
+/* PP_BusCTL - ISA Bus Control bit definition - Read/write */
+#define RESET_RX_DMA 0x0040
+#define MEMORY_ON 0x0400
+#define DMA_BURST_MODE 0x0800
+#define IO_CHANNEL_READY_ON 0x1000
+#define RX_DMA_SIZE_64K 0x2000
+#define ENABLE_IRQ 0x8000
+
+/* PP_TestCTL - Test Control bit definition - Read/write */
+#define LINK_OFF 0x0080
+#define ENDEC_LOOPBACK 0x0200
+#define AUI_LOOPBACK 0x0400
+#define BACKOFF_OFF 0x0800
+#define FDX_8900 0x4000
+#define FAST_TEST 0x8000
+
+/* PP_RxEvent - Receive Event Bit definition - Read-only */
+#define RX_IA_HASHED 0x0040
+#define RX_DRIBBLE 0x0080
+#define RX_OK 0x0100
+#define RX_HASHED 0x0200
+#define RX_IA 0x0400
+#define RX_BROADCAST 0x0800
+#define RX_CRC_ERROR 0x1000
+#define RX_RUNT 0x2000
+#define RX_EXTRA_DATA 0x4000
+
+#define HASH_INDEX_MASK 0x0FC00
+
+/* PP_TxEvent - Transmit Event Bit definition - Read-only */
+#define TX_LOST_CRS 0x0040
+#define TX_SQE_ERROR 0x0080
+#define TX_OK 0x0100
+#define TX_LATE_COL 0x0200
+#define TX_JBR 0x0400
+#define TX_16_COL 0x8000
+#define TX_SEND_OK_BITS (TX_OK|TX_LOST_CRS)
+#define TX_COL_COUNT_MASK 0x7800
+
+/* PP_BufEvent - Buffer Event Bit definition - Read-only */
+#define SW_INTERRUPT 0x0040
+#define RX_DMA 0x0080
+#define READY_FOR_TX 0x0100
+#define TX_UNDERRUN 0x0200
+#define RX_MISS 0x0400
+#define RX_128_BYTE 0x0800
+#define TX_COL_OVRFLW 0x1000
+#define RX_MISS_OVRFLW 0x2000
+#define RX_DEST_MATCH 0x8000
+
+/* PP_LineST - Ethernet Line Status bit definition - Read-only */
+#define LINK_OK 0x0080
+#define AUI_ON 0x0100
+#define TENBASET_ON 0x0200
+#define POLARITY_OK 0x1000
+#define CRS_OK 0x4000
+
+/* PP_SelfST - Chip Software Status bit definition */
+#define ACTIVE_33V 0x0040
+#define INIT_DONE 0x0080
+#define SI_BUSY 0x0100
+#define EEPROM_PRESENT 0x0200
+#define EEPROM_OK 0x0400
+#define EL_PRESENT 0x0800
+#define EE_SIZE_64 0x1000
+
+/* PP_BusST - ISA Bus Status bit definition */
+#define TX_BID_ERROR 0x0080
+#define READY_FOR_TX_NOW 0x0100
+
+/* PP_AutoNegCTL - Auto Negotiation Control bit definition */
+#define RE_NEG_NOW 0x0040
+#define ALLOW_FDX 0x0080
+#define AUTO_NEG_ENABLE 0x0100
+#define NLP_ENABLE 0x0200
+#define FORCE_FDX 0x8000
+#define AUTO_NEG_BITS (FORCE_FDX|NLP_ENABLE|AUTO_NEG_ENABLE)
+#define AUTO_NEG_MASK (FORCE_FDX|NLP_ENABLE|AUTO_NEG_ENABLE|ALLOW_FDX|RE_NEG_NOW)
+
+/* PP_AutoNegST - Auto Negotiation Status bit definition */
+#define AUTO_NEG_BUSY 0x0080
+#define FLP_LINK 0x0100
+#define FLP_LINK_GOOD 0x0800
+#define LINK_FAULT 0x1000
+#define HDX_ACTIVE 0x4000
+#define FDX_ACTIVE 0x8000
+
+/*  The following block defines the ISQ event types */
+#define ISQ_RECEIVER_EVENT 0x04
+#define ISQ_TRANSMITTER_EVENT 0x08
+#define ISQ_BUFFER_EVENT 0x0c
+#define ISQ_RX_MISS_EVENT 0x10
+#define ISQ_TX_COL_EVENT 0x12
+
+#define ISQ_EVENT_MASK 0x003F   /*  ISQ mask to find out type of event */
+#define ISQ_HIST 16		/*  small history buffer */
+#define AUTOINCREMENT 0x8000	/*  Bit mask to set bit-15 for autoincrement */
+
+#define TXRXBUFSIZE 0x0600
+#define RXDMABUFSIZE 0x8000
+#define RXDMASIZE 0x4000
+#define TXRX_LENGTH_MASK 0x07FF
+
+/*  rx options bits */
+#define RCV_WITH_RXON	1       /*  Set SerRx ON */
+#define RCV_COUNTS	2       /*  Use Framecnt1 */
+#define RCV_PONG	4       /*  Pong respondent */
+#define RCV_DONG	8       /*  Dong operation */
+#define RCV_POLLING	0x10	/*  Poll RxEvent */
+#define RCV_ISQ		0x20	/*  Use ISQ, int */
+#define RCV_AUTO_DMA	0x100	/*  Set AutoRxDMAE */
+#define RCV_DMA		0x200	/*  Set RxDMA only */
+#define RCV_DMA_ALL	0x400	/*  Copy all DMA'ed */
+#define RCV_FIXED_DATA	0x800	/*  Every frame same */
+#define RCV_IO		0x1000	/*  Use ISA IO only */
+#define RCV_MEMORY	0x2000	/*  Use ISA Memory */
+
+#define RAM_SIZE	0x1000       /*  The card has 4k bytes or RAM */
+#define PKT_START PP_TxFrame  /*  Start of packet RAM */
+
+#define RX_FRAME_PORT	0x0000
+#define TX_FRAME_PORT RX_FRAME_PORT
+#define TX_CMD_PORT	0x0004
+#define TX_NOW		0x0000       /*  Tx packet after   5 bytes copied */
+#define TX_AFTER_381	0x0040       /*  Tx packet after 381 bytes copied */
+#define TX_AFTER_ALL	0x00c0       /*  Tx packet after all bytes copied */
+#define TX_LEN_PORT	0x0006
+#define ISQ_PORT	0x0008
+#define ADD_PORT	0x000A
+#define DATA_PORT	0x000C
+
+#define EEPROM_WRITE_EN		0x00F0
+#define EEPROM_WRITE_DIS	0x0000
+#define EEPROM_WRITE_CMD	0x0100
+#define EEPROM_READ_CMD		0x0200
+
+/*  Receive Header */
+/*  Description of header of each packet in receive area of memory */
+#define RBUF_EVENT_LOW	0   /*  Low byte of RxEvent - status of received frame */
+#define RBUF_EVENT_HIGH	1   /*  High byte of RxEvent - status of received frame */
+#define RBUF_LEN_LOW	2   /*  Length of received data - low byte */
+#define RBUF_LEN_HI	3   /*  Length of received data - high byte */
+#define RBUF_HEAD_LEN	4   /*  Length of this header */
+
+#define CHIP_READ 0x1   /*  Used to mark state of the repins code (chip or dma) */
+#define DMA_READ 0x2   /*  Used to mark state of the repins code (chip or dma) */
+
+/*  for bios scan */
+/*  */
+#ifdef CSDEBUG
+/*  use these values for debugging bios scan */
+#define BIOS_START_SEG 0x00000
+#define BIOS_OFFSET_INC 0x0010
+#else
+#define BIOS_START_SEG 0x0c000
+#define BIOS_OFFSET_INC 0x0200
+#endif
+
+#define BIOS_LAST_OFFSET 0x0fc00
+
+/*  Byte offsets into the EEPROM configuration buffer */
+#define ISA_CNF_OFFSET 0x6
+#define TX_CTL_OFFSET (ISA_CNF_OFFSET + 8)			/*  8900 eeprom */
+#define AUTO_NEG_CNF_OFFSET (ISA_CNF_OFFSET + 8)		/*  8920 eeprom */
+
+  /*  the assumption here is that the bits in the eeprom are generally  */
+  /*  in the same position as those in the autonegctl register. */
+  /*  Of course the IMM bit is not in that register so it must be  */
+  /*  masked out */
+#define EE_FORCE_FDX  0x8000
+#define EE_NLP_ENABLE 0x0200
+#define EE_AUTO_NEG_ENABLE 0x0100
+#define EE_ALLOW_FDX 0x0080
+#define EE_AUTO_NEG_CNF_MASK (EE_FORCE_FDX|EE_NLP_ENABLE|EE_AUTO_NEG_ENABLE|EE_ALLOW_FDX)
+
+#define IMM_BIT 0x0040		/*  ignore missing media	 */
+
+#define ADAPTER_CNF_OFFSET (AUTO_NEG_CNF_OFFSET + 2)
+#define A_CNF_10B_T 0x0001
+#define A_CNF_AUI 0x0002
+#define A_CNF_10B_2 0x0004
+#define A_CNF_MEDIA_TYPE 0x0070
+#define A_CNF_MEDIA_AUTO 0x0070
+#define A_CNF_MEDIA_10B_T 0x0020
+#define A_CNF_MEDIA_AUI 0x0040
+#define A_CNF_MEDIA_10B_2 0x0010
+#define A_CNF_DC_DC_POLARITY 0x0080
+#define A_CNF_NO_AUTO_POLARITY 0x2000
+#define A_CNF_LOW_RX_SQUELCH 0x4000
+#define A_CNF_EXTND_10B_2 0x8000
+
+#define PACKET_PAGE_OFFSET 0x8
+
+/*  Bit definitions for the ISA configuration word from the EEPROM */
+#define INT_NO_MASK 0x000F
+#define DMA_NO_MASK 0x0070
+#define ISA_DMA_SIZE 0x0200
+#define ISA_AUTO_RxDMA 0x0400
+#define ISA_RxDMA 0x0800
+#define DMA_BURST 0x1000
+#define STREAM_TRANSFER 0x2000
+#define ANY_ISA_DMA (ISA_AUTO_RxDMA | ISA_RxDMA)
+
+/*  DMA controller registers */
+#define DMA_BASE 0x00     /*  DMA controller base */
+#define DMA_BASE_2 0x0C0    /*  DMA controller base */
+
+#define DMA_STAT 0x0D0    /*  DMA controller status register */
+#define DMA_MASK 0x0D4    /*  DMA controller mask register */
+#define DMA_MODE 0x0D6    /*  DMA controller mode register */
+#define DMA_RESETFF 0x0D8    /*  DMA controller first/last flip flop */
+
+/*  DMA data */
+#define DMA_DISABLE 0x04     /*  Disable channel n */
+#define DMA_ENABLE 0x00     /*  Enable channel n */
+/*  Demand transfers, incr. address, auto init, writes, ch. n */
+#define DMA_RX_MODE 0x14
+/*  Demand transfers, incr. address, auto init, reads, ch. n */
+#define DMA_TX_MODE 0x18
+
+#define DMA_SIZE (16*1024) /*  Size of dma buffer - 16k */
+
+#define CS8900 0x0000
+#define CS8920 0x4000
+#define CS8920M 0x6000
+#define REVISON_BITS 0x1F00
+#define EEVER_NUMBER 0x12
+#define CHKSUM_LEN 0x14
+#define CHKSUM_VAL 0x0000
+#define START_EEPROM_DATA 0x001c /*  Offset into eeprom for start of data */
+#define IRQ_MAP_EEPROM_DATA 0x0046 /*  Offset into eeprom for the IRQ map */
+#define IRQ_MAP_LEN 0x0004 /*  No of bytes to read for the IRQ map */
+#define PNP_IRQ_FRMT 0x0022 /*  PNP small item IRQ format */
+#define CS8900_IRQ_MAP 0x1c20 /*  This IRQ map is fixed */
+
+#define CS8920_NO_INTS 0x0F   /*  Max CS8920 interrupt select # */
+
+#define PNP_ADD_PORT 0x0279
+#define PNP_WRITE_PORT 0x0A79
+
+#define GET_PNP_ISA_STRUCT 0x40
+#define PNP_ISA_STRUCT_LEN 0x06
+#define PNP_CSN_CNT_OFF 0x01
+#define PNP_RD_PORT_OFF 0x02
+#define PNP_FUNCTION_OK 0x00
+#define PNP_WAKE 0x03
+#define PNP_RSRC_DATA 0x04
+#define PNP_RSRC_READY 0x01
+#define PNP_STATUS 0x05
+#define PNP_ACTIVATE 0x30
+#define PNP_CNF_IO_H 0x60
+#define PNP_CNF_IO_L 0x61
+#define PNP_CNF_INT 0x70
+#define PNP_CNF_DMA 0x74
+#define PNP_CNF_MEM 0x48
diff --git a/drivers/net/ethernet/cirrus/ep93xx_eth.c b/drivers/net/ethernet/cirrus/ep93xx_eth.c
new file mode 100644
index 0000000000..8627ab19d4
--- /dev/null
+++ b/drivers/net/ethernet/cirrus/ep93xx_eth.c
@@ -0,0 +1,874 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * EP93xx ethernet network device driver
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ * Dedicated to Marija Kulikova.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
+
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/mii.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include <linux/platform_data/eth-ep93xx.h>
+
+#define DRV_MODULE_NAME		"ep93xx-eth"
+
+#define RX_QUEUE_ENTRIES	64
+#define TX_QUEUE_ENTRIES	8
+
+#define MAX_PKT_SIZE		2044
+#define PKT_BUF_SIZE		2048
+
+#define REG_RXCTL		0x0000
+#define  REG_RXCTL_DEFAULT	0x00073800
+#define REG_TXCTL		0x0004
+#define  REG_TXCTL_ENABLE	0x00000001
+#define REG_MIICMD		0x0010
+#define  REG_MIICMD_READ	0x00008000
+#define  REG_MIICMD_WRITE	0x00004000
+#define REG_MIIDATA		0x0014
+#define REG_MIISTS		0x0018
+#define  REG_MIISTS_BUSY	0x00000001
+#define REG_SELFCTL		0x0020
+#define  REG_SELFCTL_RESET	0x00000001
+#define REG_INTEN		0x0024
+#define  REG_INTEN_TX		0x00000008
+#define  REG_INTEN_RX		0x00000007
+#define REG_INTSTSP		0x0028
+#define  REG_INTSTS_TX		0x00000008
+#define  REG_INTSTS_RX		0x00000004
+#define REG_INTSTSC		0x002c
+#define REG_AFP			0x004c
+#define REG_INDAD0		0x0050
+#define REG_INDAD1		0x0051
+#define REG_INDAD2		0x0052
+#define REG_INDAD3		0x0053
+#define REG_INDAD4		0x0054
+#define REG_INDAD5		0x0055
+#define REG_GIINTMSK		0x0064
+#define  REG_GIINTMSK_ENABLE	0x00008000
+#define REG_BMCTL		0x0080
+#define  REG_BMCTL_ENABLE_TX	0x00000100
+#define  REG_BMCTL_ENABLE_RX	0x00000001
+#define REG_BMSTS		0x0084
+#define  REG_BMSTS_RX_ACTIVE	0x00000008
+#define REG_RXDQBADD		0x0090
+#define REG_RXDQBLEN		0x0094
+#define REG_RXDCURADD		0x0098
+#define REG_RXDENQ		0x009c
+#define REG_RXSTSQBADD		0x00a0
+#define REG_RXSTSQBLEN		0x00a4
+#define REG_RXSTSQCURADD	0x00a8
+#define REG_RXSTSENQ		0x00ac
+#define REG_TXDQBADD		0x00b0
+#define REG_TXDQBLEN		0x00b4
+#define REG_TXDQCURADD		0x00b8
+#define REG_TXDENQ		0x00bc
+#define REG_TXSTSQBADD		0x00c0
+#define REG_TXSTSQBLEN		0x00c4
+#define REG_TXSTSQCURADD	0x00c8
+#define REG_MAXFRMLEN		0x00e8
+
+struct ep93xx_rdesc
+{
+	u32	buf_addr;
+	u32	rdesc1;
+};
+
+#define RDESC1_NSOF		0x80000000
+#define RDESC1_BUFFER_INDEX	0x7fff0000
+#define RDESC1_BUFFER_LENGTH	0x0000ffff
+
+struct ep93xx_rstat
+{
+	u32	rstat0;
+	u32	rstat1;
+};
+
+#define RSTAT0_RFP		0x80000000
+#define RSTAT0_RWE		0x40000000
+#define RSTAT0_EOF		0x20000000
+#define RSTAT0_EOB		0x10000000
+#define RSTAT0_AM		0x00c00000
+#define RSTAT0_RX_ERR		0x00200000
+#define RSTAT0_OE		0x00100000
+#define RSTAT0_FE		0x00080000
+#define RSTAT0_RUNT		0x00040000
+#define RSTAT0_EDATA		0x00020000
+#define RSTAT0_CRCE		0x00010000
+#define RSTAT0_CRCI		0x00008000
+#define RSTAT0_HTI		0x00003f00
+#define RSTAT1_RFP		0x80000000
+#define RSTAT1_BUFFER_INDEX	0x7fff0000
+#define RSTAT1_FRAME_LENGTH	0x0000ffff
+
+struct ep93xx_tdesc
+{
+	u32	buf_addr;
+	u32	tdesc1;
+};
+
+#define TDESC1_EOF		0x80000000
+#define TDESC1_BUFFER_INDEX	0x7fff0000
+#define TDESC1_BUFFER_ABORT	0x00008000
+#define TDESC1_BUFFER_LENGTH	0x00000fff
+
+struct ep93xx_tstat
+{
+	u32	tstat0;
+};
+
+#define TSTAT0_TXFP		0x80000000
+#define TSTAT0_TXWE		0x40000000
+#define TSTAT0_FA		0x20000000
+#define TSTAT0_LCRS		0x10000000
+#define TSTAT0_OW		0x04000000
+#define TSTAT0_TXU		0x02000000
+#define TSTAT0_ECOLL		0x01000000
+#define TSTAT0_NCOLL		0x001f0000
+#define TSTAT0_BUFFER_INDEX	0x00007fff
+
+struct ep93xx_descs
+{
+	struct ep93xx_rdesc	rdesc[RX_QUEUE_ENTRIES];
+	struct ep93xx_tdesc	tdesc[TX_QUEUE_ENTRIES];
+	struct ep93xx_rstat	rstat[RX_QUEUE_ENTRIES];
+	struct ep93xx_tstat	tstat[TX_QUEUE_ENTRIES];
+};
+
+struct ep93xx_priv
+{
+	struct resource		*res;
+	void __iomem		*base_addr;
+	int			irq;
+
+	struct ep93xx_descs	*descs;
+	dma_addr_t		descs_dma_addr;
+
+	void			*rx_buf[RX_QUEUE_ENTRIES];
+	void			*tx_buf[TX_QUEUE_ENTRIES];
+
+	spinlock_t		rx_lock;
+	unsigned int		rx_pointer;
+	unsigned int		tx_clean_pointer;
+	unsigned int		tx_pointer;
+	spinlock_t		tx_pending_lock;
+	unsigned int		tx_pending;
+
+	struct net_device	*dev;
+	struct napi_struct	napi;
+
+	struct mii_if_info	mii;
+	u8			mdc_divisor;
+};
+
+#define rdb(ep, off)		__raw_readb((ep)->base_addr + (off))
+#define rdw(ep, off)		__raw_readw((ep)->base_addr + (off))
+#define rdl(ep, off)		__raw_readl((ep)->base_addr + (off))
+#define wrb(ep, off, val)	__raw_writeb((val), (ep)->base_addr + (off))
+#define wrw(ep, off, val)	__raw_writew((val), (ep)->base_addr + (off))
+#define wrl(ep, off, val)	__raw_writel((val), (ep)->base_addr + (off))
+
+static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	int data;
+	int i;
+
+	wrl(ep, REG_MIICMD, REG_MIICMD_READ | (phy_id << 5) | reg);
+
+	for (i = 0; i < 10; i++) {
+		if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
+			break;
+		msleep(1);
+	}
+
+	if (i == 10) {
+		pr_info("mdio read timed out\n");
+		data = 0xffff;
+	} else {
+		data = rdl(ep, REG_MIIDATA);
+	}
+
+	return data;
+}
+
+static void ep93xx_mdio_write(struct net_device *dev, int phy_id, int reg, int data)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	int i;
+
+	wrl(ep, REG_MIIDATA, data);
+	wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (phy_id << 5) | reg);
+
+	for (i = 0; i < 10; i++) {
+		if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
+			break;
+		msleep(1);
+	}
+
+	if (i == 10)
+		pr_info("mdio write timed out\n");
+}
+
+static int ep93xx_rx(struct net_device *dev, int budget)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	int processed = 0;
+
+	while (processed < budget) {
+		int entry;
+		struct ep93xx_rstat *rstat;
+		u32 rstat0;
+		u32 rstat1;
+		int length;
+		struct sk_buff *skb;
+
+		entry = ep->rx_pointer;
+		rstat = ep->descs->rstat + entry;
+
+		rstat0 = rstat->rstat0;
+		rstat1 = rstat->rstat1;
+		if (!(rstat0 & RSTAT0_RFP) || !(rstat1 & RSTAT1_RFP))
+			break;
+
+		rstat->rstat0 = 0;
+		rstat->rstat1 = 0;
+
+		if (!(rstat0 & RSTAT0_EOF))
+			pr_crit("not end-of-frame %.8x %.8x\n", rstat0, rstat1);
+		if (!(rstat0 & RSTAT0_EOB))
+			pr_crit("not end-of-buffer %.8x %.8x\n", rstat0, rstat1);
+		if ((rstat1 & RSTAT1_BUFFER_INDEX) >> 16 != entry)
+			pr_crit("entry mismatch %.8x %.8x\n", rstat0, rstat1);
+
+		if (!(rstat0 & RSTAT0_RWE)) {
+			dev->stats.rx_errors++;
+			if (rstat0 & RSTAT0_OE)
+				dev->stats.rx_fifo_errors++;
+			if (rstat0 & RSTAT0_FE)
+				dev->stats.rx_frame_errors++;
+			if (rstat0 & (RSTAT0_RUNT | RSTAT0_EDATA))
+				dev->stats.rx_length_errors++;
+			if (rstat0 & RSTAT0_CRCE)
+				dev->stats.rx_crc_errors++;
+			goto err;
+		}
+
+		length = rstat1 & RSTAT1_FRAME_LENGTH;
+		if (length > MAX_PKT_SIZE) {
+			pr_notice("invalid length %.8x %.8x\n", rstat0, rstat1);
+			goto err;
+		}
+
+		/* Strip FCS.  */
+		if (rstat0 & RSTAT0_CRCI)
+			length -= 4;
+
+		skb = netdev_alloc_skb(dev, length + 2);
+		if (likely(skb != NULL)) {
+			struct ep93xx_rdesc *rxd = &ep->descs->rdesc[entry];
+			skb_reserve(skb, 2);
+			dma_sync_single_for_cpu(dev->dev.parent, rxd->buf_addr,
+						length, DMA_FROM_DEVICE);
+			skb_copy_to_linear_data(skb, ep->rx_buf[entry], length);
+			dma_sync_single_for_device(dev->dev.parent,
+						   rxd->buf_addr, length,
+						   DMA_FROM_DEVICE);
+			skb_put(skb, length);
+			skb->protocol = eth_type_trans(skb, dev);
+
+			napi_gro_receive(&ep->napi, skb);
+
+			dev->stats.rx_packets++;
+			dev->stats.rx_bytes += length;
+		} else {
+			dev->stats.rx_dropped++;
+		}
+
+err:
+		ep->rx_pointer = (entry + 1) & (RX_QUEUE_ENTRIES - 1);
+		processed++;
+	}
+
+	return processed;
+}
+
+static int ep93xx_poll(struct napi_struct *napi, int budget)
+{
+	struct ep93xx_priv *ep = container_of(napi, struct ep93xx_priv, napi);
+	struct net_device *dev = ep->dev;
+	int rx;
+
+	rx = ep93xx_rx(dev, budget);
+	if (rx < budget && napi_complete_done(napi, rx)) {
+		spin_lock_irq(&ep->rx_lock);
+		wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
+		spin_unlock_irq(&ep->rx_lock);
+	}
+
+	if (rx) {
+		wrw(ep, REG_RXDENQ, rx);
+		wrw(ep, REG_RXSTSENQ, rx);
+	}
+
+	return rx;
+}
+
+static netdev_tx_t ep93xx_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	struct ep93xx_tdesc *txd;
+	int entry;
+
+	if (unlikely(skb->len > MAX_PKT_SIZE)) {
+		dev->stats.tx_dropped++;
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	entry = ep->tx_pointer;
+	ep->tx_pointer = (ep->tx_pointer + 1) & (TX_QUEUE_ENTRIES - 1);
+
+	txd = &ep->descs->tdesc[entry];
+
+	txd->tdesc1 = TDESC1_EOF | (entry << 16) | (skb->len & 0xfff);
+	dma_sync_single_for_cpu(dev->dev.parent, txd->buf_addr, skb->len,
+				DMA_TO_DEVICE);
+	skb_copy_and_csum_dev(skb, ep->tx_buf[entry]);
+	dma_sync_single_for_device(dev->dev.parent, txd->buf_addr, skb->len,
+				   DMA_TO_DEVICE);
+	dev_kfree_skb(skb);
+
+	spin_lock_irq(&ep->tx_pending_lock);
+	ep->tx_pending++;
+	if (ep->tx_pending == TX_QUEUE_ENTRIES)
+		netif_stop_queue(dev);
+	spin_unlock_irq(&ep->tx_pending_lock);
+
+	wrl(ep, REG_TXDENQ, 1);
+
+	return NETDEV_TX_OK;
+}
+
+static void ep93xx_tx_complete(struct net_device *dev)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	int wake;
+
+	wake = 0;
+
+	spin_lock(&ep->tx_pending_lock);
+	while (1) {
+		int entry;
+		struct ep93xx_tstat *tstat;
+		u32 tstat0;
+
+		entry = ep->tx_clean_pointer;
+		tstat = ep->descs->tstat + entry;
+
+		tstat0 = tstat->tstat0;
+		if (!(tstat0 & TSTAT0_TXFP))
+			break;
+
+		tstat->tstat0 = 0;
+
+		if (tstat0 & TSTAT0_FA)
+			pr_crit("frame aborted %.8x\n", tstat0);
+		if ((tstat0 & TSTAT0_BUFFER_INDEX) != entry)
+			pr_crit("entry mismatch %.8x\n", tstat0);
+
+		if (tstat0 & TSTAT0_TXWE) {
+			int length = ep->descs->tdesc[entry].tdesc1 & 0xfff;
+
+			dev->stats.tx_packets++;
+			dev->stats.tx_bytes += length;
+		} else {
+			dev->stats.tx_errors++;
+		}
+
+		if (tstat0 & TSTAT0_OW)
+			dev->stats.tx_window_errors++;
+		if (tstat0 & TSTAT0_TXU)
+			dev->stats.tx_fifo_errors++;
+		dev->stats.collisions += (tstat0 >> 16) & 0x1f;
+
+		ep->tx_clean_pointer = (entry + 1) & (TX_QUEUE_ENTRIES - 1);
+		if (ep->tx_pending == TX_QUEUE_ENTRIES)
+			wake = 1;
+		ep->tx_pending--;
+	}
+	spin_unlock(&ep->tx_pending_lock);
+
+	if (wake)
+		netif_wake_queue(dev);
+}
+
+static irqreturn_t ep93xx_irq(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	u32 status;
+
+	status = rdl(ep, REG_INTSTSC);
+	if (status == 0)
+		return IRQ_NONE;
+
+	if (status & REG_INTSTS_RX) {
+		spin_lock(&ep->rx_lock);
+		if (likely(napi_schedule_prep(&ep->napi))) {
+			wrl(ep, REG_INTEN, REG_INTEN_TX);
+			__napi_schedule(&ep->napi);
+		}
+		spin_unlock(&ep->rx_lock);
+	}
+
+	if (status & REG_INTSTS_TX)
+		ep93xx_tx_complete(dev);
+
+	return IRQ_HANDLED;
+}
+
+static void ep93xx_free_buffers(struct ep93xx_priv *ep)
+{
+	struct device *dev = ep->dev->dev.parent;
+	int i;
+
+	if (!ep->descs)
+		return;
+
+	for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
+		dma_addr_t d;
+
+		d = ep->descs->rdesc[i].buf_addr;
+		if (d)
+			dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_FROM_DEVICE);
+
+		kfree(ep->rx_buf[i]);
+	}
+
+	for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
+		dma_addr_t d;
+
+		d = ep->descs->tdesc[i].buf_addr;
+		if (d)
+			dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_TO_DEVICE);
+
+		kfree(ep->tx_buf[i]);
+	}
+
+	dma_free_coherent(dev, sizeof(struct ep93xx_descs), ep->descs,
+							ep->descs_dma_addr);
+	ep->descs = NULL;
+}
+
+static int ep93xx_alloc_buffers(struct ep93xx_priv *ep)
+{
+	struct device *dev = ep->dev->dev.parent;
+	int i;
+
+	ep->descs = dma_alloc_coherent(dev, sizeof(struct ep93xx_descs),
+				&ep->descs_dma_addr, GFP_KERNEL);
+	if (ep->descs == NULL)
+		return 1;
+
+	for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
+		void *buf;
+		dma_addr_t d;
+
+		buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
+		if (buf == NULL)
+			goto err;
+
+		d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_FROM_DEVICE);
+		if (dma_mapping_error(dev, d)) {
+			kfree(buf);
+			goto err;
+		}
+
+		ep->rx_buf[i] = buf;
+		ep->descs->rdesc[i].buf_addr = d;
+		ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE;
+	}
+
+	for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
+		void *buf;
+		dma_addr_t d;
+
+		buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
+		if (buf == NULL)
+			goto err;
+
+		d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_TO_DEVICE);
+		if (dma_mapping_error(dev, d)) {
+			kfree(buf);
+			goto err;
+		}
+
+		ep->tx_buf[i] = buf;
+		ep->descs->tdesc[i].buf_addr = d;
+	}
+
+	return 0;
+
+err:
+	ep93xx_free_buffers(ep);
+	return 1;
+}
+
+static int ep93xx_start_hw(struct net_device *dev)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	unsigned long addr;
+	int i;
+
+	wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
+	for (i = 0; i < 10; i++) {
+		if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
+			break;
+		msleep(1);
+	}
+
+	if (i == 10) {
+		pr_crit("hw failed to reset\n");
+		return 1;
+	}
+
+	wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));
+
+	/* Does the PHY support preamble suppress?  */
+	if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
+		wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));
+
+	/* Receive descriptor ring.  */
+	addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc);
+	wrl(ep, REG_RXDQBADD, addr);
+	wrl(ep, REG_RXDCURADD, addr);
+	wrw(ep, REG_RXDQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rdesc));
+
+	/* Receive status ring.  */
+	addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rstat);
+	wrl(ep, REG_RXSTSQBADD, addr);
+	wrl(ep, REG_RXSTSQCURADD, addr);
+	wrw(ep, REG_RXSTSQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rstat));
+
+	/* Transmit descriptor ring.  */
+	addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tdesc);
+	wrl(ep, REG_TXDQBADD, addr);
+	wrl(ep, REG_TXDQCURADD, addr);
+	wrw(ep, REG_TXDQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tdesc));
+
+	/* Transmit status ring.  */
+	addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tstat);
+	wrl(ep, REG_TXSTSQBADD, addr);
+	wrl(ep, REG_TXSTSQCURADD, addr);
+	wrw(ep, REG_TXSTSQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tstat));
+
+	wrl(ep, REG_BMCTL, REG_BMCTL_ENABLE_TX | REG_BMCTL_ENABLE_RX);
+	wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
+	wrl(ep, REG_GIINTMSK, 0);
+
+	for (i = 0; i < 10; i++) {
+		if ((rdl(ep, REG_BMSTS) & REG_BMSTS_RX_ACTIVE) != 0)
+			break;
+		msleep(1);
+	}
+
+	if (i == 10) {
+		pr_crit("hw failed to start\n");
+		return 1;
+	}
+
+	wrl(ep, REG_RXDENQ, RX_QUEUE_ENTRIES);
+	wrl(ep, REG_RXSTSENQ, RX_QUEUE_ENTRIES);
+
+	wrb(ep, REG_INDAD0, dev->dev_addr[0]);
+	wrb(ep, REG_INDAD1, dev->dev_addr[1]);
+	wrb(ep, REG_INDAD2, dev->dev_addr[2]);
+	wrb(ep, REG_INDAD3, dev->dev_addr[3]);
+	wrb(ep, REG_INDAD4, dev->dev_addr[4]);
+	wrb(ep, REG_INDAD5, dev->dev_addr[5]);
+	wrl(ep, REG_AFP, 0);
+
+	wrl(ep, REG_MAXFRMLEN, (MAX_PKT_SIZE << 16) | MAX_PKT_SIZE);
+
+	wrl(ep, REG_RXCTL, REG_RXCTL_DEFAULT);
+	wrl(ep, REG_TXCTL, REG_TXCTL_ENABLE);
+
+	return 0;
+}
+
+static void ep93xx_stop_hw(struct net_device *dev)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	int i;
+
+	wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
+	for (i = 0; i < 10; i++) {
+		if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
+			break;
+		msleep(1);
+	}
+
+	if (i == 10)
+		pr_crit("hw failed to reset\n");
+}
+
+static int ep93xx_open(struct net_device *dev)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	int err;
+
+	if (ep93xx_alloc_buffers(ep))
+		return -ENOMEM;
+
+	napi_enable(&ep->napi);
+
+	if (ep93xx_start_hw(dev)) {
+		napi_disable(&ep->napi);
+		ep93xx_free_buffers(ep);
+		return -EIO;
+	}
+
+	spin_lock_init(&ep->rx_lock);
+	ep->rx_pointer = 0;
+	ep->tx_clean_pointer = 0;
+	ep->tx_pointer = 0;
+	spin_lock_init(&ep->tx_pending_lock);
+	ep->tx_pending = 0;
+
+	err = request_irq(ep->irq, ep93xx_irq, IRQF_SHARED, dev->name, dev);
+	if (err) {
+		napi_disable(&ep->napi);
+		ep93xx_stop_hw(dev);
+		ep93xx_free_buffers(ep);
+		return err;
+	}
+
+	wrl(ep, REG_GIINTMSK, REG_GIINTMSK_ENABLE);
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+static int ep93xx_close(struct net_device *dev)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+
+	napi_disable(&ep->napi);
+	netif_stop_queue(dev);
+
+	wrl(ep, REG_GIINTMSK, 0);
+	free_irq(ep->irq, dev);
+	ep93xx_stop_hw(dev);
+	ep93xx_free_buffers(ep);
+
+	return 0;
+}
+
+static int ep93xx_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	struct mii_ioctl_data *data = if_mii(ifr);
+
+	return generic_mii_ioctl(&ep->mii, data, cmd, NULL);
+}
+
+static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
+}
+
+static int ep93xx_get_link_ksettings(struct net_device *dev,
+				     struct ethtool_link_ksettings *cmd)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+
+	mii_ethtool_get_link_ksettings(&ep->mii, cmd);
+
+	return 0;
+}
+
+static int ep93xx_set_link_ksettings(struct net_device *dev,
+				     const struct ethtool_link_ksettings *cmd)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	return mii_ethtool_set_link_ksettings(&ep->mii, cmd);
+}
+
+static int ep93xx_nway_reset(struct net_device *dev)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	return mii_nway_restart(&ep->mii);
+}
+
+static u32 ep93xx_get_link(struct net_device *dev)
+{
+	struct ep93xx_priv *ep = netdev_priv(dev);
+	return mii_link_ok(&ep->mii);
+}
+
+static const struct ethtool_ops ep93xx_ethtool_ops = {
+	.get_drvinfo		= ep93xx_get_drvinfo,
+	.nway_reset		= ep93xx_nway_reset,
+	.get_link		= ep93xx_get_link,
+	.get_link_ksettings	= ep93xx_get_link_ksettings,
+	.set_link_ksettings	= ep93xx_set_link_ksettings,
+};
+
+static const struct net_device_ops ep93xx_netdev_ops = {
+	.ndo_open		= ep93xx_open,
+	.ndo_stop		= ep93xx_close,
+	.ndo_start_xmit		= ep93xx_xmit,
+	.ndo_eth_ioctl		= ep93xx_ioctl,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+};
+
+static struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
+{
+	struct net_device *dev;
+
+	dev = alloc_etherdev(sizeof(struct ep93xx_priv));
+	if (dev == NULL)
+		return NULL;
+
+	eth_hw_addr_set(dev, data->dev_addr);
+
+	dev->ethtool_ops = &ep93xx_ethtool_ops;
+	dev->netdev_ops = &ep93xx_netdev_ops;
+
+	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+
+	return dev;
+}
+
+
+static int ep93xx_eth_remove(struct platform_device *pdev)
+{
+	struct net_device *dev;
+	struct ep93xx_priv *ep;
+	struct resource *mem;
+
+	dev = platform_get_drvdata(pdev);
+	if (dev == NULL)
+		return 0;
+
+	ep = netdev_priv(dev);
+
+	/* @@@ Force down.  */
+	unregister_netdev(dev);
+	ep93xx_free_buffers(ep);
+
+	if (ep->base_addr != NULL)
+		iounmap(ep->base_addr);
+
+	if (ep->res != NULL) {
+		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		release_mem_region(mem->start, resource_size(mem));
+	}
+
+	free_netdev(dev);
+
+	return 0;
+}
+
+static int ep93xx_eth_probe(struct platform_device *pdev)
+{
+	struct ep93xx_eth_data *data;
+	struct net_device *dev;
+	struct ep93xx_priv *ep;
+	struct resource *mem;
+	int irq;
+	int err;
+
+	if (pdev == NULL)
+		return -ENODEV;
+	data = dev_get_platdata(&pdev->dev);
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irq = platform_get_irq(pdev, 0);
+	if (!mem || irq < 0)
+		return -ENXIO;
+
+	dev = ep93xx_dev_alloc(data);
+	if (dev == NULL) {
+		err = -ENOMEM;
+		goto err_out;
+	}
+	ep = netdev_priv(dev);
+	ep->dev = dev;
+	SET_NETDEV_DEV(dev, &pdev->dev);
+	netif_napi_add(dev, &ep->napi, ep93xx_poll);
+
+	platform_set_drvdata(pdev, dev);
+
+	ep->res = request_mem_region(mem->start, resource_size(mem),
+				     dev_name(&pdev->dev));
+	if (ep->res == NULL) {
+		dev_err(&pdev->dev, "Could not reserve memory region\n");
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	ep->base_addr = ioremap(mem->start, resource_size(mem));
+	if (ep->base_addr == NULL) {
+		dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
+		err = -EIO;
+		goto err_out;
+	}
+	ep->irq = irq;
+
+	ep->mii.phy_id = data->phy_id;
+	ep->mii.phy_id_mask = 0x1f;
+	ep->mii.reg_num_mask = 0x1f;
+	ep->mii.dev = dev;
+	ep->mii.mdio_read = ep93xx_mdio_read;
+	ep->mii.mdio_write = ep93xx_mdio_write;
+	ep->mdc_divisor = 40;	/* Max HCLK 100 MHz, min MDIO clk 2.5 MHz.  */
+
+	if (is_zero_ether_addr(dev->dev_addr))
+		eth_hw_addr_random(dev);
+
+	err = register_netdev(dev);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to register netdev\n");
+		goto err_out;
+	}
+
+	printk(KERN_INFO "%s: ep93xx on-chip ethernet, IRQ %d, %pM\n",
+			dev->name, ep->irq, dev->dev_addr);
+
+	return 0;
+
+err_out:
+	ep93xx_eth_remove(pdev);
+	return err;
+}
+
+
+static struct platform_driver ep93xx_eth_driver = {
+	.probe		= ep93xx_eth_probe,
+	.remove		= ep93xx_eth_remove,
+	.driver		= {
+		.name	= "ep93xx-eth",
+	},
+};
+
+module_platform_driver(ep93xx_eth_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ep93xx-eth");
diff --git a/drivers/net/ethernet/cirrus/mac89x0.c b/drivers/net/ethernet/cirrus/mac89x0.c
new file mode 100644
index 0000000000..21a70b1f0a
--- /dev/null
+++ b/drivers/net/ethernet/cirrus/mac89x0.c
@@ -0,0 +1,577 @@
+/* mac89x0.c: A Crystal Semiconductor CS89[02]0 driver for linux. */
+/*
+	Written 1996 by Russell Nelson, with reference to skeleton.c
+	written 1993-1994 by Donald Becker.
+
+	This software may be used and distributed according to the terms
+	of the GNU General Public License, incorporated herein by reference.
+
+	The author may be reached at nelson@crynwr.com, Crynwr
+	Software, 11 Grant St., Potsdam, NY 13676
+
+  Changelog:
+
+  Mike Cruse        : mcruse@cti-ltd.com
+                    : Changes for Linux 2.0 compatibility.
+                    : Added dev_id parameter in net_interrupt(),
+                    : request_irq() and free_irq(). Just NULL for now.
+
+  Mike Cruse        : Added MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT macros
+                    : in net_open() and net_close() so kerneld would know
+                    : that the module is in use and wouldn't eject the
+                    : driver prematurely.
+
+  Mike Cruse        : Rewrote init_module() and cleanup_module using 8390.c
+                    : as an example. Disabled autoprobing in init_module(),
+                    : not a good thing to do to other devices while Linux
+                    : is running from all accounts.
+
+  Alan Cox          : Removed 1.2 support, added 2.1 extra counters.
+
+  David Huggins-Daines <dhd@debian.org>
+
+  Split this off into mac89x0.c, and gutted it of all parts which are
+  not relevant to the existing CS8900 cards on the Macintosh
+  (i.e. basically the Daynaport CS and LC cards).  To be precise:
+
+    * Removed all the media-detection stuff, because these cards are
+    TP-only.
+
+    * Lobotomized the ISA interrupt bogosity, because these cards use
+    a hardwired NuBus interrupt and a magic ISAIRQ value in the card.
+
+    * Basically eliminated everything not relevant to getting the
+    cards minimally functioning on the Macintosh.
+
+  I might add that these cards are badly designed even from the Mac
+  standpoint, in that Dayna, in their infinite wisdom, used NuBus slot
+  I/O space and NuBus interrupts for these cards, but neglected to
+  provide anything even remotely resembling a NuBus ROM.  Therefore we
+  have to probe for them in a brain-damaged ISA-like fashion.
+
+  Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
+  check kmalloc and release the allocated memory on failure in
+  mac89x0_probe and in init_module
+  use local_irq_{save,restore}(flags) in net_get_stat, not just
+  local_irq_{dis,en}able()
+*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+static const char version[] =
+"cs89x0.c:v1.02 11/26/96 Russell Nelson <nelson@crynwr.com>\n";
+
+#include <linux/module.h>
+
+/*
+  Sources:
+
+	Crynwr packet driver epktisa.
+
+	Crystal Semiconductor data sheets.
+
+*/
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/string.h>
+#include <linux/nubus.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/gfp.h>
+
+#include <asm/io.h>
+#include <asm/hwtest.h>
+#include <asm/macints.h>
+
+#include "cs89x0.h"
+
+static int debug = -1;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "debug message level");
+
+/* Information that need to be kept for each board. */
+struct net_local {
+	int msg_enable;
+	int chip_type;		/* one of: CS8900, CS8920, CS8920M */
+	char chip_revision;	/* revision letter of the chip ('A'...) */
+	int send_cmd;		/* the propercommand used to send a packet. */
+	int rx_mode;
+	int curr_rx_cfg;
+        int send_underrun;      /* keep track of how many underruns in a row we get */
+};
+
+/* Index to functions, as function prototypes. */
+static int net_open(struct net_device *dev);
+static netdev_tx_t net_send_packet(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t net_interrupt(int irq, void *dev_id);
+static void set_multicast_list(struct net_device *dev);
+static void net_rx(struct net_device *dev);
+static int net_close(struct net_device *dev);
+static struct net_device_stats *net_get_stats(struct net_device *dev);
+static int set_mac_address(struct net_device *dev, void *addr);
+
+/* For reading/writing registers ISA-style */
+static inline int
+readreg_io(struct net_device *dev, int portno)
+{
+	nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
+	return swab16(nubus_readw(dev->base_addr + DATA_PORT));
+}
+
+static inline void
+writereg_io(struct net_device *dev, int portno, int value)
+{
+	nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
+	nubus_writew(swab16(value), dev->base_addr + DATA_PORT);
+}
+
+/* These are for reading/writing registers in shared memory */
+static inline int
+readreg(struct net_device *dev, int portno)
+{
+	return swab16(nubus_readw(dev->mem_start + portno));
+}
+
+static inline void
+writereg(struct net_device *dev, int portno, int value)
+{
+	nubus_writew(swab16(value), dev->mem_start + portno);
+}
+
+static const struct net_device_ops mac89x0_netdev_ops = {
+	.ndo_open		= net_open,
+	.ndo_stop		= net_close,
+	.ndo_start_xmit		= net_send_packet,
+	.ndo_get_stats		= net_get_stats,
+	.ndo_set_rx_mode	= set_multicast_list,
+	.ndo_set_mac_address	= set_mac_address,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+/* Probe for the CS8900 card in slot E.  We won't bother looking
+   anywhere else until we have a really good reason to do so. */
+static int mac89x0_device_probe(struct platform_device *pdev)
+{
+	struct net_device *dev;
+	struct net_local *lp;
+	int i, slot;
+	unsigned rev_type = 0;
+	unsigned long ioaddr;
+	unsigned short sig;
+	int err = -ENODEV;
+	struct nubus_rsrc *fres;
+
+	dev = alloc_etherdev(sizeof(struct net_local));
+	if (!dev)
+		return -ENOMEM;
+
+	/* We might have to parameterize this later */
+	slot = 0xE;
+	/* Get out now if there's a real NuBus card in slot E */
+	for_each_func_rsrc(fres)
+		if (fres->board->slot == slot)
+			goto out;
+
+	/* The pseudo-ISA bits always live at offset 0x300 (gee,
+           wonder why...) */
+	ioaddr = (unsigned long)
+		nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE);
+	{
+		int card_present;
+
+		card_present = (hwreg_present((void *)ioaddr + 4) &&
+				hwreg_present((void *)ioaddr + DATA_PORT));
+		if (!card_present)
+			goto out;
+	}
+
+	nubus_writew(0, ioaddr + ADD_PORT);
+	sig = nubus_readw(ioaddr + DATA_PORT);
+	if (sig != swab16(CHIP_EISA_ID_SIG))
+		goto out;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	/* Initialize the net_device structure. */
+	lp = netdev_priv(dev);
+
+	lp->msg_enable = netif_msg_init(debug, 0);
+
+	/* Fill in the 'dev' fields. */
+	dev->base_addr = ioaddr;
+	dev->mem_start = (unsigned long)
+		nubus_slot_addr(slot) | (((slot&0xf) << 20) + MMIOBASE);
+	dev->mem_end = dev->mem_start + 0x1000;
+
+	/* Turn on shared memory */
+	writereg_io(dev, PP_BusCTL, MEMORY_ON);
+
+	/* get the chip type */
+	rev_type = readreg(dev, PRODUCT_ID_ADD);
+	lp->chip_type = rev_type &~ REVISON_BITS;
+	lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
+
+	/* Check the chip type and revision in order to set the correct send command
+	CS8920 revision C and CS8900 revision F can use the faster send. */
+	lp->send_cmd = TX_AFTER_381;
+	if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
+		lp->send_cmd = TX_NOW;
+	if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
+		lp->send_cmd = TX_NOW;
+
+	netif_dbg(lp, drv, dev, "%s", version);
+
+	pr_info("cs89%c0%s rev %c found at %#8lx\n",
+		lp->chip_type == CS8900 ? '0' : '2',
+		lp->chip_type == CS8920M ? "M" : "",
+		lp->chip_revision, dev->base_addr);
+
+	/* Try to read the MAC address */
+	if ((readreg(dev, PP_SelfST) & (EEPROM_PRESENT | EEPROM_OK)) == 0) {
+		pr_info("No EEPROM, giving up now.\n");
+		goto out1;
+        } else {
+		u8 addr[ETH_ALEN];
+
+                for (i = 0; i < ETH_ALEN; i += 2) {
+			/* Big-endian (why??!) */
+			unsigned short s = readreg(dev, PP_IA + i);
+			addr[i] = s >> 8;
+			addr[i+1] = s & 0xff;
+                }
+		eth_hw_addr_set(dev, addr);
+        }
+
+	dev->irq = SLOT2IRQ(slot);
+
+	/* print the IRQ and ethernet address. */
+
+	pr_info("MAC %pM, IRQ %d\n", dev->dev_addr, dev->irq);
+
+	dev->netdev_ops		= &mac89x0_netdev_ops;
+
+	err = register_netdev(dev);
+	if (err)
+		goto out1;
+
+	platform_set_drvdata(pdev, dev);
+	return 0;
+out1:
+	nubus_writew(0, dev->base_addr + ADD_PORT);
+out:
+	free_netdev(dev);
+	return err;
+}
+
+/* Open/initialize the board.  This is called (in the current kernel)
+   sometime after booting when the 'ifconfig' program is run.
+
+   This routine should set everything up anew at each open, even
+   registers that "should" only need to be set once at boot, so that
+   there is non-reboot way to recover if something goes wrong.
+   */
+static int
+net_open(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	int i;
+
+	/* Disable the interrupt for now */
+	writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) & ~ENABLE_IRQ);
+
+	/* Grab the interrupt */
+	if (request_irq(dev->irq, net_interrupt, 0, "cs89x0", dev))
+		return -EAGAIN;
+
+	/* Set up the IRQ - Apparently magic */
+	if (lp->chip_type == CS8900)
+		writereg(dev, PP_CS8900_ISAINT, 0);
+	else
+		writereg(dev, PP_CS8920_ISAINT, 0);
+
+	/* set the Ethernet address */
+	for (i=0; i < ETH_ALEN/2; i++)
+		writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));
+
+	/* Turn on both receive and transmit operations */
+	writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);
+
+	/* Receive only error free packets addressed to this card */
+	lp->rx_mode = 0;
+	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);
+
+	lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;
+
+	writereg(dev, PP_RxCFG, lp->curr_rx_cfg);
+
+	writereg(dev, PP_TxCFG, TX_LOST_CRS_ENBL | TX_SQE_ERROR_ENBL | TX_OK_ENBL |
+	       TX_LATE_COL_ENBL | TX_JBR_ENBL | TX_ANY_COL_ENBL | TX_16_COL_ENBL);
+
+	writereg(dev, PP_BufCFG, READY_FOR_TX_ENBL | RX_MISS_COUNT_OVRFLOW_ENBL |
+		 TX_COL_COUNT_OVRFLOW_ENBL | TX_UNDERRUN_ENBL);
+
+	/* now that we've got our act together, enable everything */
+	writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
+	netif_start_queue(dev);
+	return 0;
+}
+
+static netdev_tx_t
+net_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	unsigned long flags;
+
+	netif_dbg(lp, tx_queued, dev, "sent %d byte packet of type %x\n",
+		  skb->len, skb->data[ETH_ALEN + ETH_ALEN] << 8 |
+		  skb->data[ETH_ALEN + ETH_ALEN + 1]);
+
+	/* keep the upload from being interrupted, since we
+	   ask the chip to start transmitting before the
+	   whole packet has been completely uploaded. */
+	local_irq_save(flags);
+	netif_stop_queue(dev);
+
+	/* initiate a transmit sequence */
+	writereg(dev, PP_TxCMD, lp->send_cmd);
+	writereg(dev, PP_TxLength, skb->len);
+
+	/* Test to see if the chip has allocated memory for the packet */
+	if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
+		/* Gasp!  It hasn't.  But that shouldn't happen since
+		   we're waiting for TxOk, so return 1 and requeue this packet. */
+		local_irq_restore(flags);
+		return NETDEV_TX_BUSY;
+	}
+
+	/* Write the contents of the packet */
+	skb_copy_from_linear_data(skb, (void *)(dev->mem_start + PP_TxFrame),
+				  skb->len+1);
+
+	local_irq_restore(flags);
+	dev_kfree_skb (skb);
+
+	return NETDEV_TX_OK;
+}
+
+/* The typical workload of the driver:
+   Handle the network interface interrupts. */
+static irqreturn_t net_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct net_local *lp;
+	int ioaddr, status;
+
+	ioaddr = dev->base_addr;
+	lp = netdev_priv(dev);
+
+	/* we MUST read all the events out of the ISQ, otherwise we'll never
+           get interrupted again.  As a consequence, we can't have any limit
+           on the number of times we loop in the interrupt handler.  The
+           hardware guarantees that eventually we'll run out of events.  Of
+           course, if you're on a slow machine, and packets are arriving
+           faster than you can read them off, you're screwed.  Hasta la
+           vista, baby!  */
+	while ((status = swab16(nubus_readw(dev->base_addr + ISQ_PORT)))) {
+		netif_dbg(lp, intr, dev, "status=%04x\n", status);
+		switch(status & ISQ_EVENT_MASK) {
+		case ISQ_RECEIVER_EVENT:
+			/* Got a packet(s). */
+			net_rx(dev);
+			break;
+		case ISQ_TRANSMITTER_EVENT:
+			dev->stats.tx_packets++;
+			netif_wake_queue(dev);
+			if ((status & TX_OK) == 0)
+				dev->stats.tx_errors++;
+			if (status & TX_LOST_CRS)
+				dev->stats.tx_carrier_errors++;
+			if (status & TX_SQE_ERROR)
+				dev->stats.tx_heartbeat_errors++;
+			if (status & TX_LATE_COL)
+				dev->stats.tx_window_errors++;
+			if (status & TX_16_COL)
+				dev->stats.tx_aborted_errors++;
+			break;
+		case ISQ_BUFFER_EVENT:
+			if (status & READY_FOR_TX) {
+				/* we tried to transmit a packet earlier,
+                                   but inexplicably ran out of buffers.
+                                   That shouldn't happen since we only ever
+                                   load one packet.  Shrug.  Do the right
+                                   thing anyway. */
+				netif_wake_queue(dev);
+			}
+			if (status & TX_UNDERRUN) {
+				netif_dbg(lp, tx_err, dev, "transmit underrun\n");
+                                lp->send_underrun++;
+                                if (lp->send_underrun == 3) lp->send_cmd = TX_AFTER_381;
+                                else if (lp->send_underrun == 6) lp->send_cmd = TX_AFTER_ALL;
+                        }
+			break;
+		case ISQ_RX_MISS_EVENT:
+			dev->stats.rx_missed_errors += (status >> 6);
+			break;
+		case ISQ_TX_COL_EVENT:
+			dev->stats.collisions += (status >> 6);
+			break;
+		}
+	}
+	return IRQ_HANDLED;
+}
+
+/* We have a good packet(s), get it/them out of the buffers. */
+static void
+net_rx(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	struct sk_buff *skb;
+	int status, length;
+
+	status = readreg(dev, PP_RxStatus);
+	if ((status & RX_OK) == 0) {
+		dev->stats.rx_errors++;
+		if (status & RX_RUNT)
+				dev->stats.rx_length_errors++;
+		if (status & RX_EXTRA_DATA)
+				dev->stats.rx_length_errors++;
+		if ((status & RX_CRC_ERROR) &&
+		    !(status & (RX_EXTRA_DATA|RX_RUNT)))
+			/* per str 172 */
+			dev->stats.rx_crc_errors++;
+		if (status & RX_DRIBBLE)
+				dev->stats.rx_frame_errors++;
+		return;
+	}
+
+	length = readreg(dev, PP_RxLength);
+	/* Malloc up new buffer. */
+	skb = alloc_skb(length, GFP_ATOMIC);
+	if (skb == NULL) {
+		dev->stats.rx_dropped++;
+		return;
+	}
+	skb_put(skb, length);
+
+	skb_copy_to_linear_data(skb, (void *)(dev->mem_start + PP_RxFrame),
+				length);
+
+	netif_dbg(lp, rx_status, dev, "received %d byte packet of type %x\n",
+		  length, skb->data[ETH_ALEN + ETH_ALEN] << 8 |
+		  skb->data[ETH_ALEN + ETH_ALEN + 1]);
+
+        skb->protocol=eth_type_trans(skb,dev);
+	netif_rx(skb);
+	dev->stats.rx_packets++;
+	dev->stats.rx_bytes += length;
+}
+
+/* The inverse routine to net_open(). */
+static int
+net_close(struct net_device *dev)
+{
+
+	writereg(dev, PP_RxCFG, 0);
+	writereg(dev, PP_TxCFG, 0);
+	writereg(dev, PP_BufCFG, 0);
+	writereg(dev, PP_BusCTL, 0);
+
+	netif_stop_queue(dev);
+
+	free_irq(dev->irq, dev);
+
+	/* Update the statistics here. */
+
+	return 0;
+
+}
+
+/* Get the current statistics.	This may be called with the card open or
+   closed. */
+static struct net_device_stats *
+net_get_stats(struct net_device *dev)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	/* Update the statistics from the device registers. */
+	dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
+	dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
+	local_irq_restore(flags);
+
+	return &dev->stats;
+}
+
+static void set_multicast_list(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+
+	if(dev->flags&IFF_PROMISC)
+	{
+		lp->rx_mode = RX_ALL_ACCEPT;
+	} else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) {
+		/* The multicast-accept list is initialized to accept-all, and we
+		   rely on higher-level filtering for now. */
+		lp->rx_mode = RX_MULTCAST_ACCEPT;
+	}
+	else
+		lp->rx_mode = 0;
+
+	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);
+
+	/* in promiscuous mode, we accept errored packets, so we have to enable interrupts on them also */
+	writereg(dev, PP_RxCFG, lp->curr_rx_cfg |
+	     (lp->rx_mode == RX_ALL_ACCEPT? (RX_CRC_ERROR_ENBL|RX_RUNT_ENBL|RX_EXTRA_DATA_ENBL) : 0));
+}
+
+
+static int set_mac_address(struct net_device *dev, void *addr)
+{
+	struct sockaddr *saddr = addr;
+	int i;
+
+	if (!is_valid_ether_addr(saddr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	eth_hw_addr_set(dev, saddr->sa_data);
+	netdev_info(dev, "Setting MAC address to %pM\n", dev->dev_addr);
+
+	/* set the Ethernet address */
+	for (i=0; i < ETH_ALEN/2; i++)
+		writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));
+
+	return 0;
+}
+
+MODULE_LICENSE("GPL");
+
+static int mac89x0_device_remove(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+
+	unregister_netdev(dev);
+	nubus_writew(0, dev->base_addr + ADD_PORT);
+	free_netdev(dev);
+	return 0;
+}
+
+static struct platform_driver mac89x0_platform_driver = {
+	.probe = mac89x0_device_probe,
+	.remove = mac89x0_device_remove,
+	.driver = {
+		.name = "mac89x0",
+	},
+};
+
+module_platform_driver(mac89x0_platform_driver);