Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1352 insertions, 0 deletions

diff --git a/drivers/net/lp486e.c b/drivers/net/lp486e.c
new file mode 100644
index 00000000000..6139f06d7d2
--- /dev/null
+++ b/drivers/net/lp486e.c
@@ -0,0 +1,1352 @@
+/* Intel Professional Workstation/panther ethernet driver */
+/* lp486e.c: A panther 82596 ethernet driver for linux. */
+/*
+    History and copyrights:
+
+    Driver skeleton
+        Written 1993 by Donald Becker.
+        Copyright 1993 United States Government as represented by the Director,
+        National Security Agency.  This software may only be used and
+	distributed according to the terms of the GNU General Public License
+	as modified by SRC, incorporated herein by reference.
+
+        The author may be reached as becker@scyld.com, or C/O
+	Scyld Computing Corporation
+	410 Severn Ave., Suite 210
+	Annapolis MD 21403
+
+    Apricot
+        Written 1994 by Mark Evans.
+        This driver is for the Apricot 82596 bus-master interface
+
+        Modularised 12/94 Mark Evans
+
+    Professional Workstation
+	Derived from apricot.c by Ard van Breemen
+	<ard@murphy.nl>|<ard@cstmel.hobby.nl>|<ard@cstmel.nl.eu.org>
+
+	Credits:
+	Thanks to Murphy Software BV for letting me write this in their time.
+	Well, actually, I get payed doing this...
+	(Also: see http://www.murphy.nl for murphy, and my homepage ~ard for
+	more information on the Professional Workstation)
+
+    Present version
+	aeb@cwi.nl
+*/
+/*
+    There are currently two motherboards that I know of in the
+    professional workstation. The only one that I know is the
+    intel panther motherboard. -- ard
+*/
+/*
+The pws is equipped with an intel 82596. This is a very intelligent controller
+which runs its own micro-code. Communication with the hostprocessor is done
+through linked lists of commands and buffers in the hostprocessors memory.
+A complete description of the 82596 is available from intel. Search for
+a file called "29021806.pdf". It is a complete description of the chip itself.
+To use it for the pws some additions are needed regarding generation of
+the PORT and CA signal, and the interrupt glue needed for a pc.
+I/O map:
+PORT  SIZE ACTION MEANING
+0xCB0    2 WRITE  Lower 16 bits for PORT command
+0xCB2    2 WRITE  Upper 16 bits for PORT command, and issue of PORT command
+0xCB4    1 WRITE  Generation of CA signal
+0xCB8    1 WRITE  Clear interrupt glue
+All other communication is through memory!
+*/
+
+#define SLOW_DOWN_IO udelay(5)
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#define DRV_NAME "lp486e"
+
+/* debug print flags */
+#define LOG_SRCDST    0x80000000
+#define LOG_STATINT   0x40000000
+#define LOG_STARTINT  0x20000000
+
+#define i596_debug debug
+
+static int i596_debug = 0;
+
+static const char * const medianame[] = {
+	"10baseT", "AUI",
+	"10baseT-FD", "AUI-FD",
+};
+
+#define LP486E_TOTAL_SIZE 16
+
+#define I596_NULL (0xffffffff)
+
+#define CMD_EOL		0x8000	/* The last command of the list, stop. */
+#define CMD_SUSP	0x4000	/* Suspend after doing cmd. */
+#define CMD_INTR	0x2000	/* Interrupt after doing cmd. */
+
+#define CMD_FLEX	0x0008	/* Enable flexible memory model */
+
+enum commands {
+	CmdNOP = 0,
+	CmdIASetup = 1,
+	CmdConfigure = 2,
+	CmdMulticastList = 3,
+	CmdTx = 4,
+	CmdTDR = 5,
+	CmdDump = 6,
+	CmdDiagnose = 7
+};
+
+#if 0
+static const char *CUcmdnames[8] = { "NOP", "IASetup", "Configure", "MulticastList",
+				     "Tx", "TDR", "Dump", "Diagnose" };
+#endif
+
+/* Status word bits */
+#define	STAT_CX		0x8000	/* The CU finished executing a command
+				   with the Interrupt bit set */
+#define	STAT_FR		0x4000	/* The RU finished receiving a frame */
+#define	STAT_CNA	0x2000	/* The CU left the active state */
+#define	STAT_RNR	0x1000	/* The RU left the active state */
+#define STAT_ACK	(STAT_CX | STAT_FR | STAT_CNA | STAT_RNR)
+#define	STAT_CUS	0x0700	/* Status of CU: 0: idle, 1: suspended,
+				   2: active, 3-7: unused */
+#define STAT_RUS	0x00f0	/* Status of RU: 0: idle, 1: suspended,
+				   2: no resources, 4: ready,
+				   10: no resources due to no more RBDs,
+				   12: no more RBDs, other: unused */
+#define	STAT_T		0x0008	/* Bus throttle timers loaded */
+#define	STAT_ZERO	0x0807	/* Always zero */
+
+#if 0
+static char *CUstates[8] = {
+	"idle", "suspended", "active", 0, 0, 0, 0, 0
+};
+static char *RUstates[16] = {
+	"idle", "suspended", "no resources", 0, "ready", 0, 0, 0,
+	0, 0, "no RBDs", 0, "out of RBDs", 0, 0, 0
+};
+
+static void
+i596_out_status(int status) {
+	int bad = 0;
+	char *s;
+
+	printk("status %4.4x:", status);
+	if (status == 0xffff)
+		printk(" strange..\n");
+	else {
+		if (status & STAT_CX)
+			printk("  CU done");
+		if (status & STAT_CNA)
+			printk("  CU stopped");
+		if (status & STAT_FR)
+			printk("  got a frame");
+		if (status & STAT_RNR)
+			printk("  RU stopped");
+		if (status & STAT_T)
+			printk("  throttled");
+		if (status & STAT_ZERO)
+			bad = 1;
+		s = CUstates[(status & STAT_CUS) >> 8];
+		if (!s)
+			bad = 1;
+		else
+			printk("  CU(%s)", s);
+		s = RUstates[(status & STAT_RUS) >> 4];
+		if (!s)
+			bad = 1;
+		else
+			printk("  RU(%s)", s);
+		if (bad)
+			printk("  bad status");
+		printk("\n");
+	}
+}
+#endif
+
+/* Command word bits */
+#define ACK_CX		0x8000
+#define ACK_FR		0x4000
+#define ACK_CNA		0x2000
+#define ACK_RNR		0x1000
+
+#define CUC_START	0x0100
+#define CUC_RESUME	0x0200
+#define CUC_SUSPEND	0x0300
+#define CUC_ABORT	0x0400
+
+#define RX_START	0x0010
+#define RX_RESUME	0x0020
+#define RX_SUSPEND	0x0030
+#define RX_ABORT	0x0040
+
+typedef u32 phys_addr;
+
+static inline phys_addr
+va_to_pa(void *x) {
+	return x ? virt_to_bus(x) : I596_NULL;
+}
+
+static inline void *
+pa_to_va(phys_addr x) {
+	return (x == I596_NULL) ? NULL : bus_to_virt(x);
+}
+
+/* status bits for cmd */
+#define CMD_STAT_C	0x8000	/* CU command complete */
+#define CMD_STAT_B	0x4000	/* CU command in progress */
+#define CMD_STAT_OK	0x2000	/* CU command completed without errors */
+#define CMD_STAT_A	0x1000	/* CU command abnormally terminated */
+
+struct i596_cmd {		/* 8 bytes */
+	unsigned short status;
+	unsigned short command;
+	phys_addr pa_next;	/* va_to_pa(struct i596_cmd *next) */
+};
+
+#define EOF		0x8000
+#define SIZE_MASK	0x3fff
+
+struct i596_tbd {
+	unsigned short size;
+	unsigned short pad;
+	phys_addr pa_next;	/* va_to_pa(struct i596_tbd *next) */
+	phys_addr pa_data;	/* va_to_pa(char *data) */
+	struct sk_buff *skb;
+};
+
+struct tx_cmd {
+	struct i596_cmd cmd;
+	phys_addr pa_tbd;	/* va_to_pa(struct i596_tbd *tbd) */
+	unsigned short size;
+	unsigned short pad;
+};
+
+/* status bits for rfd */
+#define RFD_STAT_C	0x8000	/* Frame reception complete */
+#define RFD_STAT_B	0x4000	/* Frame reception in progress */
+#define RFD_STAT_OK	0x2000	/* Frame received without errors */
+#define RFD_STATUS	0x1fff
+#define RFD_LENGTH_ERR	0x1000
+#define RFD_CRC_ERR	0x0800
+#define RFD_ALIGN_ERR	0x0400
+#define RFD_NOBUFS_ERR	0x0200
+#define RFD_DMA_ERR	0x0100	/* DMA overrun failure to acquire system bus */
+#define RFD_SHORT_FRAME_ERR	0x0080
+#define RFD_NOEOP_ERR	0x0040
+#define RFD_TRUNC_ERR	0x0020
+#define RFD_MULTICAST  0x0002	/* 0: destination had our address
+				   1: destination was broadcast/multicast */
+#define RFD_COLLISION  0x0001
+
+/* receive frame descriptor */
+struct i596_rfd {
+	unsigned short stat;
+	unsigned short cmd;
+	phys_addr pa_next;	/* va_to_pa(struct i596_rfd *next) */
+	phys_addr pa_rbd;	/* va_to_pa(struct i596_rbd *rbd) */
+	unsigned short count;
+	unsigned short size;
+	char data[1532];
+};
+
+#define RBD_EL		0x8000
+#define RBD_P		0x4000
+#define RBD_SIZEMASK	0x3fff
+#define RBD_EOF		0x8000
+#define RBD_F		0x4000
+
+/* receive buffer descriptor */
+struct i596_rbd {
+	unsigned short size;
+	unsigned short pad;
+	phys_addr pa_next;	/* va_to_pa(struct i596_tbd *next) */
+	phys_addr pa_data;	/* va_to_pa(char *data) */
+	phys_addr pa_prev;	/* va_to_pa(struct i596_tbd *prev) */
+	
+	/* Driver private part */
+	struct sk_buff *skb;
+};
+
+#define RX_RING_SIZE 64
+#define RX_SKBSIZE (ETH_FRAME_LEN+10)
+#define RX_RBD_SIZE 32
+
+/* System Control Block - 40 bytes */
+struct i596_scb {
+	u16 status;		/* 0 */
+	u16 command;		/* 2 */
+	phys_addr pa_cmd;	/* 4 - va_to_pa(struct i596_cmd *cmd) */
+	phys_addr pa_rfd;	/* 8 - va_to_pa(struct i596_rfd *rfd) */
+	u32 crc_err;		/* 12 */
+	u32 align_err;		/* 16 */
+	u32 resource_err;	/* 20 */
+	u32 over_err;		/* 24 */
+	u32 rcvdt_err;		/* 28 */
+	u32 short_err;		/* 32 */
+	u16 t_on;		/* 36 */
+	u16 t_off;		/* 38 */
+};
+
+/* Intermediate System Configuration Pointer - 8 bytes */
+struct i596_iscp {
+	u32 busy;		/* 0 */
+	phys_addr pa_scb;	/* 4 - va_to_pa(struct i596_scb *scb) */
+};
+
+/* System Configuration Pointer - 12 bytes */
+struct i596_scp {
+	u32 sysbus;		/* 0 */
+	u32 pad;		/* 4 */
+	phys_addr pa_iscp;	/* 8 - va_to_pa(struct i596_iscp *iscp) */
+};
+
+/* Selftest and dump results - needs 16-byte alignment */
+/*
+ * The size of the dump area is 304 bytes. When the dump is executed
+ * by the Port command an extra word will be appended to the dump area.
+ * The extra word is a copy of the Dump status word (containing the
+ * C, B, OK bits). [I find 0xa006, with a0 for C+OK and 6 for dump]
+ */
+struct i596_dump {
+	u16 dump[153];		/* (304 = 130h) + 2 bytes */
+};
+
+struct i596_private {		/* aligned to a 16-byte boundary */
+	struct i596_scp scp;	/* 0 - needs 16-byte alignment */
+	struct i596_iscp iscp;	/* 12 */
+	struct i596_scb scb;	/* 20 */
+	u32 dummy;		/* 60 */
+	struct i596_dump dump;	/* 64 - needs 16-byte alignment */
+
+	struct i596_cmd set_add;
+	char eth_addr[8];	/* directly follows set_add */
+
+	struct i596_cmd set_conf;
+	char i596_config[16];	/* directly follows set_conf */
+
+	struct i596_cmd tdr;
+	unsigned long tdr_stat;	/* directly follows tdr */
+
+	int last_restart;
+	struct i596_rbd *rbd_list;
+	struct i596_rbd *rbd_tail;
+	struct i596_rfd *rx_tail;
+	struct i596_cmd *cmd_tail;
+	struct i596_cmd *cmd_head;
+	int cmd_backlog;
+	unsigned long last_cmd;
+	struct net_device_stats stats;
+	spinlock_t cmd_lock;
+};
+
+static char init_setup[14] = {
+	0x8E,	/* length 14 bytes, prefetch on */
+	0xC8,	/* default: fifo to 8, monitor off */
+	0x40,	/* default: don't save bad frames (apricot.c had 0x80) */
+	0x2E,	/* (default is 0x26)
+		   No source address insertion, 8 byte preamble */
+	0x00,	/* default priority and backoff */
+	0x60,	/* default interframe spacing */
+	0x00,	/* default slot time LSB */
+	0xf2,	/* default slot time and nr of retries */
+	0x00,	/* default various bits
+		   (0: promiscuous mode, 1: broadcast disable,
+		    2: encoding mode, 3: transmit on no CRS,
+		    4: no CRC insertion, 5: CRC type,
+		    6: bit stuffing, 7: padding) */
+	0x00,	/* default carrier sense and collision detect */
+	0x40,	/* default minimum frame length */
+	0xff,	/* (default is 0xff, and that is what apricot.c has;
+		   elp486.c has 0xfb: Enable crc append in memory.) */
+	0x00,	/* default: not full duplex */
+	0x7f	/* (default is 0x3f) multi IA */
+};
+
+static int i596_open(struct net_device *dev);
+static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t i596_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int i596_close(struct net_device *dev);
+static struct net_device_stats *i596_get_stats(struct net_device *dev);
+static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
+static void print_eth(char *);
+static void set_multicast_list(struct net_device *dev);
+static void i596_tx_timeout(struct net_device *dev);
+
+static int
+i596_timeout(struct net_device *dev, char *msg, int ct) {
+	struct i596_private *lp;
+	int boguscnt = ct;
+
+	lp = (struct i596_private *) dev->priv;
+	while (lp->scb.command) {
+		if (--boguscnt == 0) {
+			printk("%s: %s timed out - stat %4.4x, cmd %4.4x\n",
+			       dev->name, msg,
+			       lp->scb.status, lp->scb.command);
+			return 1;
+		}
+		udelay(5);
+		barrier();
+	}
+	return 0;
+}
+
+static inline int
+init_rx_bufs(struct net_device *dev, int num) {
+	struct i596_private *lp;
+	struct i596_rfd *rfd;
+	int i;
+	// struct i596_rbd *rbd;
+
+	lp = (struct i596_private *) dev->priv;
+	lp->scb.pa_rfd = I596_NULL;
+
+	for (i = 0; i < num; i++) {
+		rfd = kmalloc(sizeof(struct i596_rfd), GFP_KERNEL);
+		if (rfd == NULL)
+			break;
+
+		rfd->stat = 0;
+		rfd->pa_rbd = I596_NULL;
+		rfd->count = 0;
+		rfd->size = 1532;
+		if (i == 0) {
+			rfd->cmd = CMD_EOL;
+			lp->rx_tail = rfd;
+		} else {
+			rfd->cmd = 0;
+		}
+		rfd->pa_next = lp->scb.pa_rfd;
+		lp->scb.pa_rfd = va_to_pa(rfd);
+		lp->rx_tail->pa_next = lp->scb.pa_rfd;
+	}
+
+#if 0
+	for (i = 0; i<RX_RBD_SIZE; i++) {
+		rbd = kmalloc(sizeof(struct i596_rbd), GFP_KERNEL);
+		if (rbd) {
+			rbd->pad = 0;
+			rbd->count = 0;
+			rbd->skb = dev_alloc_skb(RX_SKB_SIZE);
+			if (!rbd->skb) {
+				printk("dev_alloc_skb failed");
+			}
+			rbd->next = rfd->rbd;
+			if (i) {
+				rfd->rbd->prev = rbd;
+				rbd->size = RX_SKB_SIZE;
+			} else {
+				rbd->size = (RX_SKB_SIZE | RBD_EL);
+				lp->rbd_tail = rbd;
+			}
+
+			rfd->rbd = rbd;
+		} else {
+			printk("Could not kmalloc rbd\n");
+		}
+	}
+	lp->rbd_tail->next = rfd->rbd;
+#endif
+	return (i);
+}
+
+static inline void
+remove_rx_bufs(struct net_device *dev) {
+	struct i596_private *lp;
+	struct i596_rfd *rfd;
+
+	lp = (struct i596_private *) dev->priv;
+	lp->rx_tail->pa_next = I596_NULL;
+
+	do {
+		rfd = pa_to_va(lp->scb.pa_rfd);
+		lp->scb.pa_rfd = rfd->pa_next;
+		kfree(rfd);
+	} while (rfd != lp->rx_tail);
+
+	lp->rx_tail = NULL;
+
+#if 0
+	for (lp->rbd_list) {
+	}
+#endif
+}
+
+#define PORT_RESET              0x00    /* reset 82596 */
+#define PORT_SELFTEST           0x01    /* selftest */
+#define PORT_ALTSCP             0x02    /* alternate SCB address */
+#define PORT_DUMP               0x03    /* dump */
+
+#define IOADDR	0xcb0		/* real constant */
+#define IRQ	10		/* default IRQ - can be changed by ECU */
+
+/* The 82596 requires two 16-bit write cycles for a port command */
+static inline void
+PORT(phys_addr a, unsigned int cmd) {
+	if (a & 0xf)
+		printk("lp486e.c: PORT: address not aligned\n");
+	outw(((a & 0xffff) | cmd), IOADDR);
+	outw(((a>>16) & 0xffff), IOADDR+2);
+}
+
+static inline void
+CA(void) {
+	outb(0, IOADDR+4);
+	udelay(8);
+}
+
+static inline void
+CLEAR_INT(void) {
+	outb(0, IOADDR+8);
+}
+
+#define SIZE(x)	(sizeof(x)/sizeof((x)[0]))
+
+#if 0
+/* selftest or dump */
+static void
+i596_port_do(struct net_device *dev, int portcmd, char *cmdname) {
+	struct i596_private *lp = dev->priv;
+	u16 *outp;
+	int i, m;
+
+	memset((void *)&(lp->dump), 0, sizeof(struct i596_dump));
+	outp = &(lp->dump.dump[0]);
+
+	PORT(va_to_pa(outp), portcmd);
+	mdelay(30);             /* random, unmotivated */
+
+	printk("lp486e i82596 %s result:\n", cmdname);
+	for (m = SIZE(lp->dump.dump); m && lp->dump.dump[m-1] == 0; m--)
+		;
+	for (i = 0; i < m; i++) {
+		printk(" %04x", lp->dump.dump[i]);
+		if (i%8 == 7)
+			printk("\n");
+	}
+	printk("\n");
+}
+#endif
+
+static int
+i596_scp_setup(struct net_device *dev) {
+	struct i596_private *lp = dev->priv;
+	int boguscnt;
+
+	/* Setup SCP, ISCP, SCB */
+	/*
+	 * sysbus bits:
+	 *  only a single byte is significant - here 0x44
+	 *  0x80: big endian mode (details depend on stepping)
+	 *  0x40: 1
+	 *  0x20: interrupt pin is active low
+	 *  0x10: lock function disabled
+	 *  0x08: external triggering of bus throttle timers
+	 *  0x06: 00: 82586 compat mode, 01: segmented mode, 10: linear mode
+	 *  0x01: unused
+	 */
+	lp->scp.sysbus = 0x00440000; 		/* linear mode */
+	lp->scp.pad = 0;			/* must be zero */
+	lp->scp.pa_iscp = va_to_pa(&(lp->iscp));
+
+	/*
+	 * The CPU sets the ISCP to 1 before it gives the first CA()
+	 */
+	lp->iscp.busy = 0x0001;
+	lp->iscp.pa_scb = va_to_pa(&(lp->scb));
+
+	lp->scb.command = 0;
+	lp->scb.status = 0;
+	lp->scb.pa_cmd = I596_NULL;
+	/* lp->scb.pa_rfd has been initialised already */
+
+	lp->last_cmd = jiffies;
+	lp->cmd_backlog = 0;
+	lp->cmd_head = NULL;
+
+	/*
+	 * Reset the 82596.
+	 * We need to wait 10 systemclock cycles, and
+	 * 5 serial clock cycles.
+	 */
+	PORT(0, PORT_RESET);	/* address part ignored */
+	udelay(100);
+
+	/*
+	 * Before the CA signal is asserted, the default SCP address
+	 * (0x00fffff4) can be changed to a 16-byte aligned value
+	 */
+	PORT(va_to_pa(&lp->scp), PORT_ALTSCP);	/* change the scp address */
+
+	/*
+	 * The initialization procedure begins when a
+	 * Channel Attention signal is asserted after a reset.
+	 */
+
+	CA();
+
+	/*
+	 * The ISCP busy is cleared by the 82596 after the SCB address is read.
+	 */
+	boguscnt = 100;
+	while (lp->iscp.busy) {
+		if (--boguscnt == 0) {
+			/* No i82596 present? */
+			printk("%s: i82596 initialization timed out\n",
+			       dev->name);
+			return 1;
+		}
+		udelay(5);
+		barrier();
+	}
+	/* I find here boguscnt==100, so no delay was required. */
+
+	return 0;
+}
+
+static int
+init_i596(struct net_device *dev) {
+	struct i596_private *lp;
+
+	if (i596_scp_setup(dev))
+		return 1;
+
+	lp = (struct i596_private *) dev->priv;
+	lp->scb.command = 0;
+
+	memcpy ((void *)lp->i596_config, init_setup, 14);
+	lp->set_conf.command = CmdConfigure;
+	i596_add_cmd(dev, (void *)&lp->set_conf);
+
+	memcpy ((void *)lp->eth_addr, dev->dev_addr, 6);
+	lp->set_add.command = CmdIASetup;
+	i596_add_cmd(dev, (struct i596_cmd *)&lp->set_add);
+
+	lp->tdr.command = CmdTDR;
+	i596_add_cmd(dev, (struct i596_cmd *)&lp->tdr);
+
+	if (lp->scb.command && i596_timeout(dev, "i82596 init", 200))
+		return 1;
+
+	lp->scb.command = RX_START;
+	CA();
+
+	barrier();
+	
+	if (lp->scb.command && i596_timeout(dev, "Receive Unit start", 100))
+		return 1;
+
+	return 0;
+}
+
+/* Receive a single frame */
+static inline int
+i596_rx_one(struct net_device *dev, struct i596_private *lp,
+	    struct i596_rfd *rfd, int *frames) {
+
+	if (rfd->stat & RFD_STAT_OK) {
+		/* a good frame */
+		int pkt_len = (rfd->count & 0x3fff);
+		struct sk_buff *skb = dev_alloc_skb(pkt_len);
+
+		(*frames)++;
+
+		if (rfd->cmd & CMD_EOL)
+			printk("Received on EOL\n");
+
+		if (skb == NULL) {
+			printk ("%s: i596_rx Memory squeeze, "
+				"dropping packet.\n", dev->name);
+			lp->stats.rx_dropped++;
+			return 1;
+		}
+
+		skb->dev = dev;		
+		memcpy(skb_put(skb,pkt_len), rfd->data, pkt_len);
+
+		skb->protocol = eth_type_trans(skb,dev);
+		netif_rx(skb);
+		dev->last_rx = jiffies;
+		lp->stats.rx_packets++;
+	} else {
+#if 0
+		printk("Frame reception error status %04x\n",
+		       rfd->stat);
+#endif
+		lp->stats.rx_errors++;
+		if (rfd->stat & RFD_COLLISION)
+			lp->stats.collisions++;
+		if (rfd->stat & RFD_SHORT_FRAME_ERR)
+			lp->stats.rx_length_errors++;
+		if (rfd->stat & RFD_DMA_ERR)
+			lp->stats.rx_over_errors++;
+		if (rfd->stat & RFD_NOBUFS_ERR)
+			lp->stats.rx_fifo_errors++;
+		if (rfd->stat & RFD_ALIGN_ERR)
+			lp->stats.rx_frame_errors++;
+		if (rfd->stat & RFD_CRC_ERR)
+			lp->stats.rx_crc_errors++;
+		if (rfd->stat & RFD_LENGTH_ERR)
+			lp->stats.rx_length_errors++;
+	}
+	rfd->stat = rfd->count = 0;
+	return 0;
+}
+
+static int
+i596_rx(struct net_device *dev) {
+	struct i596_private *lp = (struct i596_private *) dev->priv;
+	struct i596_rfd *rfd;
+	int frames = 0;
+
+	while (1) {
+		rfd = pa_to_va(lp->scb.pa_rfd);
+		if (!rfd) {
+			printk(KERN_ERR "i596_rx: NULL rfd?\n");
+			return 0;
+		}
+#if 1
+		if (rfd->stat && !(rfd->stat & (RFD_STAT_C | RFD_STAT_B)))
+			printk("SF:%p-%04x\n", rfd, rfd->stat);
+#endif
+		if (!(rfd->stat & RFD_STAT_C))
+			break;		/* next one not ready */
+		if (i596_rx_one(dev, lp, rfd, &frames))
+			break;		/* out of memory */
+		rfd->cmd = CMD_EOL;
+		lp->rx_tail->cmd = 0;
+		lp->rx_tail = rfd;
+		lp->scb.pa_rfd = rfd->pa_next;
+		barrier();
+	}
+
+	return frames;
+}
+
+static void
+i596_cleanup_cmd(struct net_device *dev) {
+	struct i596_private *lp;
+	struct i596_cmd *cmd;
+
+	lp = (struct i596_private *) dev->priv;
+	while (lp->cmd_head) {
+		cmd = (struct i596_cmd *)lp->cmd_head;
+
+		lp->cmd_head = pa_to_va(lp->cmd_head->pa_next);
+		lp->cmd_backlog--;
+
+		switch ((cmd->command) & 0x7) {
+			case CmdTx: {
+				struct tx_cmd *tx_cmd = (struct tx_cmd *) cmd;
+				struct i596_tbd * tx_cmd_tbd;
+				tx_cmd_tbd = pa_to_va(tx_cmd->pa_tbd);
+
+				dev_kfree_skb_any(tx_cmd_tbd->skb);
+
+				lp->stats.tx_errors++;
+				lp->stats.tx_aborted_errors++;
+
+				cmd->pa_next = I596_NULL;
+				kfree((unsigned char *)tx_cmd);
+				netif_wake_queue(dev);
+				break;
+			}
+			case CmdMulticastList: {
+				// unsigned short count = *((unsigned short *) (ptr + 1));
+
+				cmd->pa_next = I596_NULL;
+				kfree((unsigned char *)cmd);
+				break;
+			}
+			default: {
+				cmd->pa_next = I596_NULL;
+				break;
+			}
+		}
+		barrier();
+	}
+
+	if (lp->scb.command && i596_timeout(dev, "i596_cleanup_cmd", 100))
+		;
+
+	lp->scb.pa_cmd = va_to_pa(lp->cmd_head);
+}
+
+static void i596_reset(struct net_device *dev, struct i596_private *lp, int ioaddr) {
+
+	if (lp->scb.command && i596_timeout(dev, "i596_reset", 100))
+		;
+
+	netif_stop_queue(dev);
+
+	lp->scb.command = CUC_ABORT | RX_ABORT;
+	CA();
+	barrier();
+	
+	/* wait for shutdown */
+	if (lp->scb.command && i596_timeout(dev, "i596_reset(2)", 400))
+		;
+
+	i596_cleanup_cmd(dev);
+	i596_rx(dev);
+
+	netif_start_queue(dev);
+	/*dev_kfree_skb(skb, FREE_WRITE);*/
+	init_i596(dev);
+}
+
+static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd) {
+	struct i596_private *lp = dev->priv;
+	int ioaddr = dev->base_addr;
+	unsigned long flags;
+
+	cmd->status = 0;
+	cmd->command |= (CMD_EOL | CMD_INTR);
+	cmd->pa_next = I596_NULL;
+
+	spin_lock_irqsave(&lp->cmd_lock, flags);
+	
+	if (lp->cmd_head) {
+		lp->cmd_tail->pa_next = va_to_pa(cmd);
+	} else {
+		lp->cmd_head = cmd;
+		if (lp->scb.command && i596_timeout(dev, "i596_add_cmd", 100))
+			;
+		lp->scb.pa_cmd = va_to_pa(cmd);
+		lp->scb.command = CUC_START;
+		CA();
+	}
+	lp->cmd_tail = cmd;
+	lp->cmd_backlog++;
+
+	lp->cmd_head = pa_to_va(lp->scb.pa_cmd);
+	spin_unlock_irqrestore(&lp->cmd_lock, flags);
+
+	if (lp->cmd_backlog > 16) {
+		int tickssofar = jiffies - lp->last_cmd;
+		if (tickssofar < HZ/4)
+			return;
+
+		printk(KERN_WARNING "%s: command unit timed out, status resetting.\n", dev->name);
+		i596_reset(dev, lp, ioaddr);
+	}
+}
+
+static int i596_open(struct net_device *dev) 
+{
+	int i;
+
+	i = request_irq(dev->irq, &i596_interrupt, SA_SHIRQ, dev->name, dev);
+	if (i) {
+		printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
+		return i;
+	}
+
+	if ((i = init_rx_bufs(dev, RX_RING_SIZE)) < RX_RING_SIZE)
+		printk(KERN_ERR "%s: only able to allocate %d receive buffers\n", dev->name, i);
+
+	if (i < 4) {
+		free_irq(dev->irq, dev);
+		return -EAGAIN;
+	}
+	netif_start_queue(dev);
+	init_i596(dev);
+	return 0;			/* Always succeed */
+}
+
+static int i596_start_xmit (struct sk_buff *skb, struct net_device *dev) {
+	struct i596_private *lp = dev->priv;
+	struct tx_cmd *tx_cmd;
+	short length;
+
+	length = skb->len;
+	
+	if (length < ETH_ZLEN) {
+		skb = skb_padto(skb, ETH_ZLEN);
+		if (skb == NULL)
+			return 0;
+		length = ETH_ZLEN;
+	}
+	
+	dev->trans_start = jiffies;
+
+	tx_cmd = (struct tx_cmd *) kmalloc ((sizeof (struct tx_cmd) + sizeof (struct i596_tbd)), GFP_ATOMIC);
+	if (tx_cmd == NULL) {
+		printk(KERN_WARNING "%s: i596_xmit Memory squeeze, dropping packet.\n", dev->name);
+		lp->stats.tx_dropped++;
+		dev_kfree_skb (skb);
+	} else {
+		struct i596_tbd *tx_cmd_tbd;
+		tx_cmd_tbd = (struct i596_tbd *) (tx_cmd + 1);
+		tx_cmd->pa_tbd = va_to_pa (tx_cmd_tbd);
+		tx_cmd_tbd->pa_next = I596_NULL;
+
+		tx_cmd->cmd.command = (CMD_FLEX | CmdTx);
+
+		tx_cmd->pad = 0;
+		tx_cmd->size = 0;
+		tx_cmd_tbd->pad = 0;
+		tx_cmd_tbd->size = (EOF | length);
+
+		tx_cmd_tbd->pa_data = va_to_pa (skb->data);
+		tx_cmd_tbd->skb = skb;
+
+		if (i596_debug & LOG_SRCDST)
+			print_eth (skb->data);
+
+		i596_add_cmd (dev, (struct i596_cmd *) tx_cmd);
+
+		lp->stats.tx_packets++;
+	}
+
+	return 0;
+}
+
+static void
+i596_tx_timeout (struct net_device *dev) {
+	struct i596_private *lp = dev->priv;
+	int ioaddr = dev->base_addr;
+
+	/* Transmitter timeout, serious problems. */
+	printk(KERN_WARNING "%s: transmit timed out, status resetting.\n", dev->name);
+	lp->stats.tx_errors++;
+
+	/* Try to restart the adaptor */
+	if (lp->last_restart == lp->stats.tx_packets) {
+		printk ("Resetting board.\n");
+
+		/* Shutdown and restart */
+		i596_reset (dev, lp, ioaddr);
+	} else {
+		/* Issue a channel attention signal */
+		printk ("Kicking board.\n");
+		lp->scb.command = (CUC_START | RX_START);
+		CA();
+		lp->last_restart = lp->stats.tx_packets;
+	}
+	netif_wake_queue(dev);
+}
+
+static void print_eth(char *add) 
+{
+	int i;
+
+	printk ("Dest  ");
+	for (i = 0; i < 6; i++)
+		printk(" %2.2X", (unsigned char) add[i]);
+	printk ("\n");
+
+	printk ("Source");
+	for (i = 0; i < 6; i++)
+		printk(" %2.2X", (unsigned char) add[i+6]);
+	printk ("\n");
+
+	printk ("type %2.2X%2.2X\n",
+		(unsigned char) add[12], (unsigned char) add[13]);
+}
+
+static int __init lp486e_probe(struct net_device *dev) {
+	struct i596_private *lp;
+	unsigned char eth_addr[6] = { 0, 0xaa, 0, 0, 0, 0 };
+	unsigned char *bios;
+	int i, j;
+	int ret = -ENOMEM;
+	static int probed;
+
+	if (probed)
+		return -ENODEV;
+	probed++;
+
+	if (!request_region(IOADDR, LP486E_TOTAL_SIZE, DRV_NAME)) {
+		printk(KERN_ERR "lp486e: IO address 0x%x in use\n", IOADDR);
+		return -EBUSY;
+	}
+
+	lp = (struct i596_private *) dev->priv;
+	spin_lock_init(&lp->cmd_lock);
+	
+	/*
+	 * Do we really have this thing?
+	 */
+	if (i596_scp_setup(dev)) {
+		ret = -ENODEV;
+		goto err_out_kfree;
+	}
+
+	dev->base_addr = IOADDR;
+	dev->irq = IRQ;
+
+
+	/*
+	 * How do we find the ethernet address? I don't know.
+	 * One possibility is to look at the EISA configuration area
+	 * [0xe8000-0xe9fff]. This contains the ethernet address
+	 * but not at a fixed address - things depend on setup options.
+	 *
+	 * If we find no address, or the wrong address, use
+	 *   ifconfig eth0 hw ether a1:a2:a3:a4:a5:a6
+	 * with the value found in the BIOS setup.
+	 */
+	bios = bus_to_virt(0xe8000);
+	for (j = 0; j < 0x2000; j++) {
+		if (bios[j] == 0 && bios[j+1] == 0xaa && bios[j+2] == 0) {
+			printk("%s: maybe address at BIOS 0x%x:",
+			       dev->name, 0xe8000+j);
+			for (i = 0; i < 6; i++) {
+				eth_addr[i] = bios[i+j];
+				printk(" %2.2X", eth_addr[i]);
+			}
+			printk("\n");
+		}
+	}
+
+	printk("%s: lp486e 82596 at %#3lx, IRQ %d,",
+	       dev->name, dev->base_addr, dev->irq);
+	for (i = 0; i < 6; i++)
+		printk(" %2.2X", dev->dev_addr[i] = eth_addr[i]);
+	printk("\n");
+
+	/* The LP486E-specific entries in the device structure. */
+	dev->open = &i596_open;
+	dev->stop = &i596_close;
+	dev->hard_start_xmit = &i596_start_xmit;
+	dev->get_stats = &i596_get_stats;
+	dev->set_multicast_list = &set_multicast_list;
+	dev->watchdog_timeo = 5*HZ;
+	dev->tx_timeout = i596_tx_timeout;
+
+#if 0
+	/* selftest reports 0x320925ae - don't know what that means */
+	i596_port_do(dev, PORT_SELFTEST, "selftest");
+	i596_port_do(dev, PORT_DUMP, "dump");
+#endif
+	return 0;
+
+err_out_kfree:
+	release_region(IOADDR, LP486E_TOTAL_SIZE);
+	return ret;
+}
+
+static inline void
+i596_handle_CU_completion(struct net_device *dev,
+			  struct i596_private *lp,
+			  unsigned short status,
+			  unsigned short *ack_cmdp) {
+	struct i596_cmd *cmd;
+	int frames_out = 0;
+	int commands_done = 0;
+	int cmd_val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&lp->cmd_lock, flags);
+	cmd = lp->cmd_head;
+
+	while (lp->cmd_head && (lp->cmd_head->status & CMD_STAT_C)) {
+		cmd = lp->cmd_head;
+
+		lp->cmd_head = pa_to_va(lp->cmd_head->pa_next);
+		lp->cmd_backlog--;
+
+		commands_done++;
+		cmd_val = cmd->command & 0x7;
+#if 0
+		printk("finished CU %s command (%d)\n",
+		       CUcmdnames[cmd_val], cmd_val);
+#endif
+		switch (cmd_val) {
+		case CmdTx:
+		{
+			struct tx_cmd *tx_cmd;
+			struct i596_tbd *tx_cmd_tbd;
+
+			tx_cmd = (struct tx_cmd *) cmd;
+			tx_cmd_tbd = pa_to_va(tx_cmd->pa_tbd);
+
+			frames_out++;
+			if (cmd->status & CMD_STAT_OK) {
+				if (i596_debug)
+					print_eth(pa_to_va(tx_cmd_tbd->pa_data));
+			} else {
+				lp->stats.tx_errors++;
+				if (i596_debug)
+					printk("transmission failure:%04x\n",
+					       cmd->status);
+				if (cmd->status & 0x0020)
+					lp->stats.collisions++;
+				if (!(cmd->status & 0x0040))
+					lp->stats.tx_heartbeat_errors++;
+				if (cmd->status & 0x0400)
+					lp->stats.tx_carrier_errors++;
+				if (cmd->status & 0x0800)
+					lp->stats.collisions++;
+				if (cmd->status & 0x1000)
+					lp->stats.tx_aborted_errors++;
+			}
+			dev_kfree_skb_irq(tx_cmd_tbd->skb);
+
+			cmd->pa_next = I596_NULL;
+			kfree((unsigned char *)tx_cmd);
+			netif_wake_queue(dev);
+			break;
+		}
+
+		case CmdMulticastList:
+			cmd->pa_next = I596_NULL;
+			kfree((unsigned char *)cmd);
+			break;
+
+		case CmdTDR:
+		{
+			unsigned long status = *((unsigned long *) (cmd + 1));
+			if (status & 0x8000) {
+				if (i596_debug)
+					printk("%s: link ok.\n", dev->name);
+			} else {
+				if (status & 0x4000)
+					printk("%s: Transceiver problem.\n",
+					       dev->name);
+				if (status & 0x2000)
+					printk("%s: Termination problem.\n",
+					       dev->name);
+				if (status & 0x1000)
+					printk("%s: Short circuit.\n",
+					       dev->name);
+				printk("%s: Time %ld.\n",
+				       dev->name, status & 0x07ff);
+			}
+		}
+		default:
+			cmd->pa_next = I596_NULL;
+			lp->last_cmd = jiffies;
+			
+		}
+		barrier();
+	}
+
+	cmd = lp->cmd_head;
+	while (cmd && (cmd != lp->cmd_tail)) {
+		cmd->command &= 0x1fff;
+		cmd = pa_to_va(cmd->pa_next);
+		barrier();
+	}
+
+	if (lp->cmd_head)
+		*ack_cmdp |= CUC_START;
+	lp->scb.pa_cmd = va_to_pa(lp->cmd_head);
+	spin_unlock_irqrestore(&lp->cmd_lock, flags);
+}
+
+static irqreturn_t
+i596_interrupt (int irq, void *dev_instance, struct pt_regs *regs) {
+	struct net_device *dev = (struct net_device *) dev_instance;
+	struct i596_private *lp;
+	unsigned short status, ack_cmd = 0;
+	int frames_in = 0;
+
+	lp = (struct i596_private *) dev->priv;
+
+	/*
+	 * The 82596 examines the command, performs the required action,
+	 * and then clears the SCB command word.
+	 */
+	if (lp->scb.command && i596_timeout(dev, "interrupt", 40))
+		;
+
+	/*
+	 * The status word indicates the status of the 82596.
+	 * It is modified only by the 82596.
+	 *
+	 * [So, we must not clear it. I find often status 0xffff,
+	 *  which is not one of the values allowed by the docs.]
+	 */
+	status = lp->scb.status;
+#if 0
+	if (i596_debug) {
+		printk("%s: i596 interrupt, ", dev->name);
+		i596_out_status(status);
+	}
+#endif
+	/* Impossible, but it happens - perhaps when we get
+	   a receive interrupt but scb.pa_rfd is I596_NULL. */
+	if (status == 0xffff) {
+		printk("%s: i596_interrupt: got status 0xffff\n", dev->name);
+		goto out;
+	}
+
+	ack_cmd = (status & STAT_ACK);
+
+	if (status & (STAT_CX | STAT_CNA))
+		i596_handle_CU_completion(dev, lp, status, &ack_cmd);
+
+	if (status & (STAT_FR | STAT_RNR)) {
+		/* Restart the receive unit when it got inactive somehow */
+		if ((status & STAT_RNR) && netif_running(dev))
+			ack_cmd |= RX_START;
+
+		if (status & STAT_FR) {
+			frames_in = i596_rx(dev);
+			if (!frames_in)
+				printk("receive frame reported, but no frames\n");
+		}
+	}
+
+	/* acknowledge the interrupt */
+	/*
+	if ((lp->scb.pa_cmd != I596_NULL) && netif_running(dev))
+		ack_cmd |= CUC_START;
+	*/
+
+	if (lp->scb.command && i596_timeout(dev, "i596 interrupt", 100))
+		;
+
+	lp->scb.command = ack_cmd;
+
+	CLEAR_INT();
+	CA();
+
+ out:
+	return IRQ_HANDLED;
+}
+
+static int i596_close(struct net_device *dev) {
+	struct i596_private *lp = dev->priv;
+
+	netif_stop_queue(dev);
+
+	if (i596_debug)
+		printk("%s: Shutting down ethercard, status was %4.4x.\n",
+		       dev->name, lp->scb.status);
+
+	lp->scb.command = (CUC_ABORT | RX_ABORT);
+	CA();
+
+	i596_cleanup_cmd(dev);
+
+	if (lp->scb.command && i596_timeout(dev, "i596_close", 200))
+		;
+
+	free_irq(dev->irq, dev);
+	remove_rx_bufs(dev);
+
+	return 0;
+}
+
+static struct net_device_stats * i596_get_stats(struct net_device *dev) {
+	struct i596_private *lp = dev->priv;
+
+	return &lp->stats;
+}
+
+/*
+*	Set or clear the multicast filter for this adaptor.
+*/
+
+static void set_multicast_list(struct net_device *dev) {
+	struct i596_private *lp = dev->priv;
+	struct i596_cmd *cmd;
+
+	if (i596_debug > 1)
+		printk ("%s: set multicast list %d\n",
+			dev->name, dev->mc_count);
+
+	if (dev->mc_count > 0) {
+		struct dev_mc_list *dmi;
+		char *cp;
+		cmd = (struct i596_cmd *)kmalloc(sizeof(struct i596_cmd)+2+dev->mc_count*6, GFP_ATOMIC);
+		if (cmd == NULL) {
+			printk (KERN_ERR "%s: set_multicast Memory squeeze.\n", dev->name);
+			return;
+		}
+		cmd->command = CmdMulticastList;
+		*((unsigned short *) (cmd + 1)) = dev->mc_count * 6;
+		cp = ((char *)(cmd + 1))+2;
+		for (dmi = dev->mc_list; dmi != NULL; dmi = dmi->next) {
+			memcpy(cp, dmi,6);
+			cp += 6;
+		}
+		if (i596_debug & LOG_SRCDST)
+			print_eth (((char *)(cmd + 1)) + 2);
+		i596_add_cmd(dev, cmd);
+	} else {
+		if (lp->set_conf.pa_next != I596_NULL) {
+			return;
+		}
+		if (dev->mc_count == 0 && !(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
+			if (dev->flags & IFF_ALLMULTI)
+				dev->flags |= IFF_PROMISC;
+			lp->i596_config[8] &= ~0x01;
+		} else {
+			lp->i596_config[8] |= 0x01;
+		}
+
+		i596_add_cmd(dev, (struct i596_cmd *) &lp->set_conf);
+	}
+}
+
+MODULE_AUTHOR("Ard van Breemen <ard@cstmel.nl.eu.org>");
+MODULE_DESCRIPTION("Intel Panther onboard i82596 driver");
+MODULE_LICENSE("GPL");
+
+static struct net_device *dev_lp486e;
+static int full_duplex;
+static int options;
+static int io = IOADDR;
+static int irq = IRQ;
+
+module_param(debug, int, 0);
+//module_param(max_interrupt_work, int, 0);
+//module_param(reverse_probe, int, 0);
+//module_param(rx_copybreak, int, 0);
+module_param(options, int, 0);
+module_param(full_duplex, int, 0);
+
+static int __init lp486e_init_module(void) {
+	int err;
+	struct net_device *dev = alloc_etherdev(sizeof(struct i596_private));
+	if (!dev)
+		return -ENOMEM;
+
+	dev->irq = irq;
+	dev->base_addr = io;
+	err = lp486e_probe(dev);
+	if (err) {
+		free_netdev(dev);
+		return err;
+	}
+	err = register_netdev(dev);
+	if (err) {
+		release_region(dev->base_addr, LP486E_TOTAL_SIZE);
+		free_netdev(dev);
+		return err;
+	}
+	dev_lp486e = dev;
+	full_duplex = 0;
+	options = 0;
+	return 0;
+}
+
+static void __exit lp486e_cleanup_module(void) {
+	unregister_netdev(dev_lp486e);
+	release_region(dev_lp486e->base_addr, LP486E_TOTAL_SIZE);
+	free_netdev(dev_lp486e);
+}
+
+module_init(lp486e_init_module);
+module_exit(lp486e_cleanup_module);