Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 1916 insertions, 0 deletions

diff --git a/drivers/net/ethernet/cirrus/cs89x0.c b/drivers/net/ethernet/cirrus/cs89x0.c
new file mode 100644
index 000000000..06a0c00af
--- /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/of_device.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 <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) {
+		dev_warn(&dev->dev, "interrupt resource missing\n");
+		err = -ENXIO;
+		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>");