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, 1607 insertions, 0 deletions

diff --git a/drivers/net/lasi_82596.c b/drivers/net/lasi_82596.c
new file mode 100644
index 0000000..5e263fc
--- /dev/null
+++ b/drivers/net/lasi_82596.c
@@ -0,0 +1,1607 @@
+/* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
+   munged into HPPA boxen .
+
+   This driver is based upon 82596.c, original credits are below...
+   but there were too many hoops which HP wants jumped through to
+   keep this code in there in a sane manner.
+
+   3 primary sources of the mess -- 
+   1) hppa needs *lots* of cacheline flushing to keep this kind of
+   MMIO running.
+
+   2) The 82596 needs to see all of its pointers as their physical
+   address.  Thus virt_to_bus/bus_to_virt are *everywhere*.
+
+   3) The implementation HP is using seems to be significantly pickier 
+   about when and how the command and RX units are started.  some
+   command ordering was changed.
+
+   Examination of the mach driver leads one to believe that there
+   might be a saner way to pull this off...  anyone who feels like a
+   full rewrite can be my guest.
+
+   Split 02/13/2000 Sam Creasey (sammy@oh.verio.com)
+   
+   02/01/2000  Initial modifications for parisc by Helge Deller (deller@gmx.de)
+   03/02/2000  changes for better/correct(?) cache-flushing (deller)
+*/
+
+/* 82596.c: A generic 82596 ethernet driver for linux. */
+/*
+   Based on Apricot.c
+   Written 1994 by Mark Evans.
+   This driver is for the Apricot 82596 bus-master interface
+
+   Modularised 12/94 Mark Evans
+
+
+   Modified to support the 82596 ethernet chips on 680x0 VME boards.
+   by Richard Hirst <richard@sleepie.demon.co.uk>
+   Renamed to be 82596.c
+
+   980825:  Changed to receive directly in to sk_buffs which are
+   allocated at open() time.  Eliminates copy on incoming frames
+   (small ones are still copied).  Shared data now held in a
+   non-cached page, so we can run on 68060 in copyback mode.
+
+   TBD:
+   * look at deferring rx frames rather than discarding (as per tulip)
+   * handle tx ring full as per tulip
+   * performace test to tune rx_copybreak
+
+   Most of my modifications relate to the braindead big-endian
+   implementation by Intel.  When the i596 is operating in
+   'big-endian' mode, it thinks a 32 bit value of 0x12345678
+   should be stored as 0x56781234.  This is a real pain, when
+   you have linked lists which are shared by the 680x0 and the
+   i596.
+
+   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
+
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/pdc.h>
+#include <asm/cache.h>
+#include <asm/parisc-device.h>
+
+#define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
+
+/* DEBUG flags
+ */
+
+#define DEB_INIT	0x0001
+#define DEB_PROBE	0x0002
+#define DEB_SERIOUS	0x0004
+#define DEB_ERRORS	0x0008
+#define DEB_MULTI	0x0010
+#define DEB_TDR		0x0020
+#define DEB_OPEN	0x0040
+#define DEB_RESET	0x0080
+#define DEB_ADDCMD	0x0100
+#define DEB_STATUS	0x0200
+#define DEB_STARTTX	0x0400
+#define DEB_RXADDR	0x0800
+#define DEB_TXADDR	0x1000
+#define DEB_RXFRAME	0x2000
+#define DEB_INTS	0x4000
+#define DEB_STRUCT	0x8000
+#define DEB_ANY		0xffff
+
+
+#define DEB(x,y)	if (i596_debug & (x)) { y; }
+
+
+#define  CHECK_WBACK(addr,len) \
+	do { dma_cache_sync((void *)addr, len, DMA_TO_DEVICE); } while (0)
+
+#define  CHECK_INV(addr,len) \
+	do { dma_cache_sync((void *)addr, len, DMA_FROM_DEVICE); } while(0)
+
+#define  CHECK_WBACK_INV(addr,len) \
+	do { dma_cache_sync((void *)addr, len, DMA_BIDIRECTIONAL); } while (0)
+
+
+#define PA_I82596_RESET		0	/* Offsets relative to LASI-LAN-Addr.*/
+#define PA_CPU_PORT_L_ACCESS	4
+#define PA_CHANNEL_ATTENTION	8
+
+
+/*
+ * Define various macros for Channel Attention, word swapping etc., dependent
+ * on architecture.  MVME and BVME are 680x0 based, otherwise it is Intel.
+ */
+
+#ifdef __BIG_ENDIAN
+#define WSWAPrfd(x)  (((u32)(x)<<16) | ((((u32)(x)))>>16))
+#define WSWAPrbd(x)  (((u32)(x)<<16) | ((((u32)(x)))>>16))
+#define WSWAPiscp(x) (((u32)(x)<<16) | ((((u32)(x)))>>16))
+#define WSWAPscb(x)  (((u32)(x)<<16) | ((((u32)(x)))>>16))
+#define WSWAPcmd(x)  (((u32)(x)<<16) | ((((u32)(x)))>>16))
+#define WSWAPtbd(x)  (((u32)(x)<<16) | ((((u32)(x)))>>16))
+#define WSWAPchar(x) (((u32)(x)<<16) | ((((u32)(x)))>>16))
+#define ISCP_BUSY	0x00010000
+#define MACH_IS_APRICOT	0
+#else
+#define WSWAPrfd(x)     ((struct i596_rfd *)(x))
+#define WSWAPrbd(x)     ((struct i596_rbd *)(x))
+#define WSWAPiscp(x)    ((struct i596_iscp *)(x))
+#define WSWAPscb(x)     ((struct i596_scb *)(x))
+#define WSWAPcmd(x)     ((struct i596_cmd *)(x))
+#define WSWAPtbd(x)     ((struct i596_tbd *)(x))
+#define WSWAPchar(x)    ((char *)(x))
+#define ISCP_BUSY	0x0001
+#define MACH_IS_APRICOT	1
+#endif
+
+/*
+ * The MPU_PORT command allows direct access to the 82596. With PORT access
+ * the following commands are available (p5-18). The 32-bit port command
+ * must be word-swapped with the most significant word written first.
+ * This only applies to VME boards.
+ */
+#define PORT_RESET		0x00	/* reset 82596 */
+#define PORT_SELFTEST		0x01	/* selftest */
+#define PORT_ALTSCP		0x02	/* alternate SCB address */
+#define PORT_ALTDUMP		0x03	/* Alternate DUMP address */
+
+static int i596_debug = (DEB_SERIOUS|DEB_PROBE);  
+
+MODULE_AUTHOR("Richard Hirst");
+MODULE_DESCRIPTION("i82596 driver");
+MODULE_LICENSE("GPL");
+MODULE_PARM(i596_debug, "i");
+MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
+
+/* Copy frames shorter than rx_copybreak, otherwise pass on up in
+ * a full sized sk_buff.  Value of 100 stolen from tulip.c (!alpha).
+ */
+static int rx_copybreak = 100;
+
+#define MAX_DRIVERS	4	/* max count of drivers */
+
+#define PKT_BUF_SZ	1536
+#define MAX_MC_CNT	64
+
+#define I596_NULL ((u32)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, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
+	CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
+};
+
+#define STAT_C		0x8000	/* Set to 0 after execution */
+#define STAT_B		0x4000	/* Command being executed */
+#define STAT_OK		0x2000	/* Command executed ok */
+#define STAT_A		0x1000	/* Command aborted */
+
+#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
+
+#define TX_TIMEOUT	5
+
+#define OPT_SWAP_PORT	0x0001	/* Need to wordswp on the MPU port */
+
+
+struct i596_reg {
+	unsigned short porthi;
+	unsigned short portlo;
+	u32            ca;
+};
+
+#define EOF		0x8000
+#define SIZE_MASK	0x3fff
+
+struct i596_tbd {
+	unsigned short size;
+	unsigned short pad;
+	dma_addr_t     next;
+	dma_addr_t     data;
+	u32 cache_pad[5];		/* Total 32 bytes... */
+};
+
+/* The command structure has two 'next' pointers; v_next is the address of
+ * the next command as seen by the CPU, b_next is the address of the next
+ * command as seen by the 82596.  The b_next pointer, as used by the 82596
+ * always references the status field of the next command, rather than the
+ * v_next field, because the 82596 is unaware of v_next.  It may seem more
+ * logical to put v_next at the end of the structure, but we cannot do that
+ * because the 82596 expects other fields to be there, depending on command
+ * type.
+ */
+
+struct i596_cmd {
+	struct i596_cmd *v_next;	/* Address from CPUs viewpoint */
+	unsigned short status;
+	unsigned short command;
+	dma_addr_t     b_next;	/* Address from i596 viewpoint */
+};
+
+struct tx_cmd {
+	struct i596_cmd cmd;
+	dma_addr_t     tbd;
+	unsigned short size;
+	unsigned short pad;
+	struct sk_buff *skb;		/* So we can free it after tx */
+	dma_addr_t dma_addr;
+#ifdef __LP64__
+	u32 cache_pad[6];		/* Total 64 bytes... */
+#else    
+	u32 cache_pad[1];		/* Total 32 bytes... */
+#endif    
+};
+
+struct tdr_cmd {
+	struct i596_cmd cmd;
+	unsigned short status;
+	unsigned short pad;
+};
+
+struct mc_cmd {
+	struct i596_cmd cmd;
+	short mc_cnt;
+	char mc_addrs[MAX_MC_CNT*6];
+};
+
+struct sa_cmd {
+	struct i596_cmd cmd;
+	char eth_addr[8];
+};
+
+struct cf_cmd {
+	struct i596_cmd cmd;
+	char i596_config[16];
+};
+
+struct i596_rfd {
+	unsigned short stat;
+	unsigned short cmd;
+	dma_addr_t     b_next;	/* Address from i596 viewpoint */
+	dma_addr_t     rbd;
+	unsigned short count;
+	unsigned short size;
+	struct i596_rfd *v_next;	/* Address from CPUs viewpoint */
+	struct i596_rfd *v_prev;
+#ifndef __LP64__    
+	u32 cache_pad[2];		/* Total 32 bytes... */
+#endif    
+};
+
+struct i596_rbd {
+    /* hardware data */
+    unsigned short count;
+    unsigned short zero1;
+    dma_addr_t     b_next;
+    dma_addr_t     b_data;		/* Address from i596 viewpoint */
+    unsigned short size;
+    unsigned short zero2;
+    /* driver data */
+    struct sk_buff *skb;
+    struct i596_rbd *v_next;
+    dma_addr_t     b_addr;		/* This rbd addr from i596 view */
+    unsigned char *v_data;		/* Address from CPUs viewpoint */
+					/* Total 32 bytes... */
+#ifdef __LP64__
+    u32 cache_pad[4];
+#endif    
+};
+
+/* These values as chosen so struct i596_private fits in one page... */
+
+#define TX_RING_SIZE 32
+#define RX_RING_SIZE 16
+
+struct i596_scb {
+	unsigned short status;
+	unsigned short command;
+	dma_addr_t    cmd;
+	dma_addr_t    rfd;
+	u32           crc_err;
+	u32           align_err;
+	u32           resource_err;
+	u32           over_err;
+	u32           rcvdt_err;
+	u32           short_err;
+	unsigned short t_on;
+	unsigned short t_off;
+};
+
+struct i596_iscp {
+	u32           stat;
+	dma_addr_t    scb;
+};
+
+struct i596_scp {
+	u32           sysbus;
+	u32            pad;
+	dma_addr_t    iscp;
+};
+
+struct i596_private {
+	volatile struct i596_scp scp		__attribute__((aligned(32)));
+	volatile struct i596_iscp iscp		__attribute__((aligned(32)));
+	volatile struct i596_scb scb		__attribute__((aligned(32)));
+	struct sa_cmd sa_cmd			__attribute__((aligned(32)));
+	struct cf_cmd cf_cmd			__attribute__((aligned(32)));
+	struct tdr_cmd tdr_cmd			__attribute__((aligned(32)));
+	struct mc_cmd mc_cmd			__attribute__((aligned(32)));
+	struct i596_rfd rfds[RX_RING_SIZE]	__attribute__((aligned(32)));
+	struct i596_rbd rbds[RX_RING_SIZE]	__attribute__((aligned(32)));
+	struct tx_cmd tx_cmds[TX_RING_SIZE]	__attribute__((aligned(32)));
+	struct i596_tbd tbds[TX_RING_SIZE]	__attribute__((aligned(32)));
+	u32    stat;
+	int last_restart;
+	struct i596_rfd *rfd_head;
+	struct i596_rbd *rbd_head;
+	struct i596_cmd *cmd_tail;
+	struct i596_cmd *cmd_head;
+	int cmd_backlog;
+	u32    last_cmd;
+	struct net_device_stats stats;
+	int next_tx_cmd;
+	int options;
+	spinlock_t lock;
+	dma_addr_t dma_addr;
+	struct device *dev;
+};
+
+static char init_setup[] =
+{
+	0x8E,			/* length, prefetch on */
+	0xC8,			/* fifo to 8, monitor off */
+	0x80,			/* don't save bad frames */
+	0x2E,			/* No source address insertion, 8 byte preamble */
+	0x00,			/* priority and backoff defaults */
+	0x60,			/* interframe spacing */
+	0x00,			/* slot time LSB */
+	0xf2,			/* slot time and retries */
+	0x00,			/* promiscuous mode */
+	0x00,			/* collision detect */
+	0x40,			/* minimum frame length */
+	0xff,
+	0x00,
+	0x7f /*  *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 i596_tx_timeout (struct net_device *dev);
+static void print_eth(unsigned char *buf, char *str);
+static void set_multicast_list(struct net_device *dev);
+
+static int rx_ring_size = RX_RING_SIZE;
+static int ticks_limit = 100;
+static int max_cmd_backlog = TX_RING_SIZE-1;
+
+
+static inline void CA(struct net_device *dev)
+{
+	gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
+}
+
+
+static inline void MPU_PORT(struct net_device *dev, int c, dma_addr_t x)
+{
+	struct i596_private *lp = dev->priv;
+
+	u32 v = (u32) (c) | (u32) (x);
+	u16 a, b;
+
+	if (lp->options & OPT_SWAP_PORT) {
+		a = v >> 16;
+		b = v & 0xffff;
+	} else {
+		a = v & 0xffff;
+		b = v >> 16;
+	}
+
+	gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
+	udelay(1);
+	gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
+}
+
+
+static inline int wait_istat(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
+{
+	CHECK_INV(&(lp->iscp), sizeof(struct i596_iscp));
+	while (--delcnt && lp->iscp.stat) {
+		udelay(10);
+		CHECK_INV(&(lp->iscp), sizeof(struct i596_iscp));
+	}
+	if (!delcnt) {
+		printk("%s: %s, iscp.stat %04x, didn't clear\n",
+		     dev->name, str, lp->iscp.stat);
+		return -1;
+	}
+	else
+		return 0;
+}
+
+
+static inline int wait_cmd(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
+{
+	CHECK_INV(&(lp->scb), sizeof(struct i596_scb));
+	while (--delcnt && lp->scb.command) {
+		udelay(10);
+		CHECK_INV(&(lp->scb), sizeof(struct i596_scb));
+	}
+	if (!delcnt) {
+		printk("%s: %s, status %4.4x, cmd %4.4x.\n",
+		     dev->name, str, lp->scb.status, lp->scb.command);
+		return -1;
+	}
+	else
+		return 0;
+}
+
+
+static void i596_display_data(struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	struct i596_cmd *cmd;
+	struct i596_rfd *rfd;
+	struct i596_rbd *rbd;
+
+	printk("lp and scp at %p, .sysbus = %08x, .iscp = %08x\n",
+	       &lp->scp, lp->scp.sysbus, lp->scp.iscp);
+	printk("iscp at %p, iscp.stat = %08x, .scb = %08x\n",
+	       &lp->iscp, lp->iscp.stat, lp->iscp.scb);
+	printk("scb at %p, scb.status = %04x, .command = %04x,"
+		" .cmd = %08x, .rfd = %08x\n",
+	       &lp->scb, lp->scb.status, lp->scb.command,
+		lp->scb.cmd, lp->scb.rfd);
+	printk("   errors: crc %x, align %x, resource %x,"
+               " over %x, rcvdt %x, short %x\n",
+		lp->scb.crc_err, lp->scb.align_err, lp->scb.resource_err,
+		lp->scb.over_err, lp->scb.rcvdt_err, lp->scb.short_err);
+	cmd = lp->cmd_head;
+	while (cmd != NULL) {
+		printk("cmd at %p, .status = %04x, .command = %04x, .b_next = %08x\n",
+		  cmd, cmd->status, cmd->command, cmd->b_next);
+		cmd = cmd->v_next;
+	}
+	rfd = lp->rfd_head;
+	printk("rfd_head = %p\n", rfd);
+	do {
+		printk("   %p .stat %04x, .cmd %04x, b_next %08x, rbd %08x,"
+                        " count %04x\n",
+			rfd, rfd->stat, rfd->cmd, rfd->b_next, rfd->rbd,
+			rfd->count);
+		rfd = rfd->v_next;
+	} while (rfd != lp->rfd_head);
+	rbd = lp->rbd_head;
+	printk("rbd_head = %p\n", rbd);
+	do {
+		printk("   %p .count %04x, b_next %08x, b_data %08x, size %04x\n",
+			rbd, rbd->count, rbd->b_next, rbd->b_data, rbd->size);
+		rbd = rbd->v_next;
+	} while (rbd != lp->rbd_head);
+	CHECK_INV(lp, sizeof(struct i596_private));
+}
+
+
+#if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
+static void i596_error(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;
+
+	pcc2[0x28] = 1;
+	pcc2[0x2b] = 0x1d;
+	printk("%s: Error interrupt\n", dev->name);
+	i596_display_data(dev);
+}
+#endif
+
+#define virt_to_dma(lp,v) ((lp)->dma_addr + (dma_addr_t)((unsigned long)(v)-(unsigned long)(lp)))
+
+static inline void init_rx_bufs(struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	int i;
+	struct i596_rfd *rfd;
+	struct i596_rbd *rbd;
+
+	/* First build the Receive Buffer Descriptor List */
+
+	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
+		dma_addr_t dma_addr;
+		struct sk_buff *skb = dev_alloc_skb(PKT_BUF_SZ + 4);
+
+		if (skb == NULL)
+			panic("%s: alloc_skb() failed", __FILE__);
+		skb_reserve(skb, 2);
+		dma_addr = dma_map_single(lp->dev, skb->tail,PKT_BUF_SZ,
+					  DMA_FROM_DEVICE);
+		skb->dev = dev;
+		rbd->v_next = rbd+1;
+		rbd->b_next = WSWAPrbd(virt_to_dma(lp,rbd+1));
+		rbd->b_addr = WSWAPrbd(virt_to_dma(lp,rbd));
+		rbd->skb = skb;
+		rbd->v_data = skb->tail;
+		rbd->b_data = WSWAPchar(dma_addr);
+		rbd->size = PKT_BUF_SZ;
+	}
+	lp->rbd_head = lp->rbds;
+	rbd = lp->rbds + rx_ring_size - 1;
+	rbd->v_next = lp->rbds;
+	rbd->b_next = WSWAPrbd(virt_to_dma(lp,lp->rbds));
+
+	/* Now build the Receive Frame Descriptor List */
+
+	for (i = 0, rfd = lp->rfds; i < rx_ring_size; i++, rfd++) {
+		rfd->rbd = I596_NULL;
+		rfd->v_next = rfd+1;
+		rfd->v_prev = rfd-1;
+		rfd->b_next = WSWAPrfd(virt_to_dma(lp,rfd+1));
+		rfd->cmd = CMD_FLEX;
+	}
+	lp->rfd_head = lp->rfds;
+	lp->scb.rfd = WSWAPrfd(virt_to_dma(lp,lp->rfds));
+	rfd = lp->rfds;
+	rfd->rbd = WSWAPrbd(virt_to_dma(lp,lp->rbd_head));
+	rfd->v_prev = lp->rfds + rx_ring_size - 1;
+	rfd = lp->rfds + rx_ring_size - 1;
+	rfd->v_next = lp->rfds;
+	rfd->b_next = WSWAPrfd(virt_to_dma(lp,lp->rfds));
+	rfd->cmd = CMD_EOL|CMD_FLEX;
+
+	CHECK_WBACK_INV(lp, sizeof(struct i596_private));
+}
+
+static inline void remove_rx_bufs(struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	struct i596_rbd *rbd;
+	int i;
+
+	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
+		if (rbd->skb == NULL)
+			break;
+		dma_unmap_single(lp->dev,
+				 (dma_addr_t)WSWAPchar(rbd->b_data), 
+				 PKT_BUF_SZ, DMA_FROM_DEVICE);
+		dev_kfree_skb(rbd->skb);
+	}
+}
+
+
+static void rebuild_rx_bufs(struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	int i;
+
+	/* Ensure rx frame/buffer descriptors are tidy */
+
+	for (i = 0; i < rx_ring_size; i++) {
+		lp->rfds[i].rbd = I596_NULL;
+		lp->rfds[i].cmd = CMD_FLEX;
+	}
+	lp->rfds[rx_ring_size-1].cmd = CMD_EOL|CMD_FLEX;
+	lp->rfd_head = lp->rfds;
+	lp->scb.rfd = WSWAPrfd(virt_to_dma(lp,lp->rfds));
+	lp->rbd_head = lp->rbds;
+	lp->rfds[0].rbd = WSWAPrbd(virt_to_dma(lp,lp->rbds));
+
+	CHECK_WBACK_INV(lp, sizeof(struct i596_private));
+}
+
+
+static int init_i596_mem(struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	unsigned long flags;
+
+	disable_irq(dev->irq);	/* disable IRQs from LAN */
+	DEB(DEB_INIT,
+		printk("RESET 82596 port: %p (with IRQ %d disabled)\n",
+		       (void*)(dev->base_addr + PA_I82596_RESET),
+		       dev->irq));
+	
+	gsc_writel(0, (void*)(dev->base_addr + PA_I82596_RESET)); /* Hard Reset */
+	udelay(100);			/* Wait 100us - seems to help */
+
+	/* change the scp address */
+
+	lp->last_cmd = jiffies;
+
+
+	lp->scp.sysbus = 0x0000006c;
+	lp->scp.iscp = WSWAPiscp(virt_to_dma(lp,&(lp->iscp)));
+	lp->iscp.scb = WSWAPscb(virt_to_dma(lp,&(lp->scb)));
+	lp->iscp.stat = ISCP_BUSY;
+	lp->cmd_backlog = 0;
+
+	lp->cmd_head = NULL;
+        lp->scb.cmd = I596_NULL;
+
+	DEB(DEB_INIT, printk("%s: starting i82596.\n", dev->name));
+
+	CHECK_WBACK(&(lp->scp), sizeof(struct i596_scp));
+	CHECK_WBACK(&(lp->iscp), sizeof(struct i596_iscp));
+
+	MPU_PORT(dev, PORT_ALTSCP, virt_to_dma(lp,&lp->scp));	
+
+	CA(dev);
+
+	if (wait_istat(dev, lp, 1000, "initialization timed out"))
+		goto failed;
+	DEB(DEB_INIT, printk("%s: i82596 initialization successful\n", dev->name));
+
+	/* Ensure rx frame/buffer descriptors are tidy */
+	rebuild_rx_bufs(dev);
+
+	lp->scb.command = 0;
+	CHECK_WBACK(&(lp->scb), sizeof(struct i596_scb));
+
+	enable_irq(dev->irq);	/* enable IRQs from LAN */
+
+	DEB(DEB_INIT, printk("%s: queuing CmdConfigure\n", dev->name));
+	memcpy(lp->cf_cmd.i596_config, init_setup, 14);
+	lp->cf_cmd.cmd.command = CmdConfigure;
+	CHECK_WBACK(&(lp->cf_cmd), sizeof(struct cf_cmd));
+	i596_add_cmd(dev, &lp->cf_cmd.cmd);
+
+	DEB(DEB_INIT, printk("%s: queuing CmdSASetup\n", dev->name));
+	memcpy(lp->sa_cmd.eth_addr, dev->dev_addr, 6);
+	lp->sa_cmd.cmd.command = CmdSASetup;
+	CHECK_WBACK(&(lp->sa_cmd), sizeof(struct sa_cmd));
+	i596_add_cmd(dev, &lp->sa_cmd.cmd);
+
+	DEB(DEB_INIT, printk("%s: queuing CmdTDR\n", dev->name));
+	lp->tdr_cmd.cmd.command = CmdTDR;
+	CHECK_WBACK(&(lp->tdr_cmd), sizeof(struct tdr_cmd));
+	i596_add_cmd(dev, &lp->tdr_cmd.cmd);
+
+	spin_lock_irqsave (&lp->lock, flags);
+
+	if (wait_cmd(dev, lp, 1000, "timed out waiting to issue RX_START")) {
+		spin_unlock_irqrestore (&lp->lock, flags);
+		goto failed;
+	}
+	DEB(DEB_INIT, printk("%s: Issuing RX_START\n", dev->name));
+	lp->scb.command = RX_START;
+	lp->scb.rfd = WSWAPrfd(virt_to_dma(lp,lp->rfds));
+	CHECK_WBACK(&(lp->scb), sizeof(struct i596_scb));
+
+	CA(dev);
+
+	spin_unlock_irqrestore (&lp->lock, flags);
+
+	if (wait_cmd(dev, lp, 1000, "RX_START not processed"))
+		goto failed;
+	DEB(DEB_INIT, printk("%s: Receive unit started OK\n", dev->name));
+
+	return 0;
+
+failed:
+	printk("%s: Failed to initialise 82596\n", dev->name);
+	MPU_PORT(dev, PORT_RESET, 0);
+	return -1;
+}
+
+
+static inline int i596_rx(struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	struct i596_rfd *rfd;
+	struct i596_rbd *rbd;
+	int frames = 0;
+
+	DEB(DEB_RXFRAME, printk("i596_rx(), rfd_head %p, rbd_head %p\n",
+			lp->rfd_head, lp->rbd_head));
+
+
+	rfd = lp->rfd_head;		/* Ref next frame to check */
+
+	CHECK_INV(rfd, sizeof(struct i596_rfd));
+	while ((rfd->stat) & STAT_C) {	/* Loop while complete frames */
+		if (rfd->rbd == I596_NULL)
+			rbd = NULL;
+		else if (rfd->rbd == lp->rbd_head->b_addr) {
+			rbd = lp->rbd_head;
+			CHECK_INV(rbd, sizeof(struct i596_rbd));
+		}
+		else {
+			printk("%s: rbd chain broken!\n", dev->name);
+			/* XXX Now what? */
+			rbd = NULL;
+		}
+		DEB(DEB_RXFRAME, printk("  rfd %p, rfd.rbd %08x, rfd.stat %04x\n",
+			rfd, rfd->rbd, rfd->stat));
+		
+		if (rbd != NULL && ((rfd->stat) & STAT_OK)) {
+			/* a good frame */
+			int pkt_len = rbd->count & 0x3fff;
+			struct sk_buff *skb = rbd->skb;
+			int rx_in_place = 0;
+
+			DEB(DEB_RXADDR,print_eth(rbd->v_data, "received"));
+			frames++;
+
+			/* Check if the packet is long enough to just accept
+			 * without copying to a properly sized skbuff.
+			 */
+
+			if (pkt_len > rx_copybreak) {
+				struct sk_buff *newskb;
+				dma_addr_t dma_addr;
+
+				dma_unmap_single(lp->dev,(dma_addr_t)WSWAPchar(rbd->b_data), PKT_BUF_SZ, DMA_FROM_DEVICE);
+				/* Get fresh skbuff to replace filled one. */
+				newskb = dev_alloc_skb(PKT_BUF_SZ + 4);
+				if (newskb == NULL) {
+					skb = NULL;	/* drop pkt */
+					goto memory_squeeze;
+				}
+				skb_reserve(newskb, 2);
+
+				/* Pass up the skb already on the Rx ring. */
+				skb_put(skb, pkt_len);
+				rx_in_place = 1;
+				rbd->skb = newskb;
+				newskb->dev = dev;
+				dma_addr = dma_map_single(lp->dev, newskb->tail, PKT_BUF_SZ, DMA_FROM_DEVICE);
+				rbd->v_data = newskb->tail;
+				rbd->b_data = WSWAPchar(dma_addr);
+				CHECK_WBACK_INV(rbd, sizeof(struct i596_rbd));
+			}
+			else
+				skb = dev_alloc_skb(pkt_len + 2);
+memory_squeeze:
+			if (skb == NULL) {
+				/* XXX tulip.c can defer packets here!! */
+				printk("%s: i596_rx Memory squeeze, dropping packet.\n", dev->name);
+				lp->stats.rx_dropped++;
+			}
+			else {
+				skb->dev = dev;
+				if (!rx_in_place) {
+					/* 16 byte align the data fields */
+					dma_sync_single_for_cpu(lp->dev, (dma_addr_t)WSWAPchar(rbd->b_data), PKT_BUF_SZ, DMA_FROM_DEVICE);
+					skb_reserve(skb, 2);
+					memcpy(skb_put(skb,pkt_len), rbd->v_data, pkt_len);
+					dma_sync_single_for_device(lp->dev, (dma_addr_t)WSWAPchar(rbd->b_data), PKT_BUF_SZ, DMA_FROM_DEVICE);
+				}
+				skb->len = pkt_len;
+				skb->protocol=eth_type_trans(skb,dev);
+				netif_rx(skb);
+				dev->last_rx = jiffies;
+				lp->stats.rx_packets++;
+				lp->stats.rx_bytes+=pkt_len;
+			}
+		}
+		else {
+			DEB(DEB_ERRORS, printk("%s: Error, rfd.stat = 0x%04x\n",
+					dev->name, rfd->stat));
+			lp->stats.rx_errors++;
+			if ((rfd->stat) & 0x0001)
+				lp->stats.collisions++;
+			if ((rfd->stat) & 0x0080)
+				lp->stats.rx_length_errors++;
+			if ((rfd->stat) & 0x0100)
+				lp->stats.rx_over_errors++;
+			if ((rfd->stat) & 0x0200)
+				lp->stats.rx_fifo_errors++;
+			if ((rfd->stat) & 0x0400)
+				lp->stats.rx_frame_errors++;
+			if ((rfd->stat) & 0x0800)
+				lp->stats.rx_crc_errors++;
+			if ((rfd->stat) & 0x1000)
+				lp->stats.rx_length_errors++;
+		}
+
+		/* Clear the buffer descriptor count and EOF + F flags */
+
+		if (rbd != NULL && (rbd->count & 0x4000)) {
+			rbd->count = 0;
+			lp->rbd_head = rbd->v_next;
+			CHECK_WBACK_INV(rbd, sizeof(struct i596_rbd));
+		}
+
+		/* Tidy the frame descriptor, marking it as end of list */
+
+		rfd->rbd = I596_NULL;
+		rfd->stat = 0;
+		rfd->cmd = CMD_EOL|CMD_FLEX;
+		rfd->count = 0;
+
+		/* Remove end-of-list from old end descriptor */
+
+		rfd->v_prev->cmd = CMD_FLEX;
+
+		/* Update record of next frame descriptor to process */
+
+		lp->scb.rfd = rfd->b_next;
+		lp->rfd_head = rfd->v_next;
+		CHECK_WBACK_INV(rfd->v_prev, sizeof(struct i596_rfd));
+		CHECK_WBACK_INV(rfd, sizeof(struct i596_rfd));
+		rfd = lp->rfd_head;
+		CHECK_INV(rfd, sizeof(struct i596_rfd));
+	}
+
+	DEB(DEB_RXFRAME, printk("frames %d\n", frames));
+
+	return 0;
+}
+
+
+static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
+{
+	struct i596_cmd *ptr;
+
+	while (lp->cmd_head != NULL) {
+		ptr = lp->cmd_head;
+		lp->cmd_head = ptr->v_next;
+		lp->cmd_backlog--;
+
+		switch ((ptr->command) & 0x7) {
+		case CmdTx:
+			{
+				struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
+				struct sk_buff *skb = tx_cmd->skb;
+				dma_unmap_single(lp->dev, tx_cmd->dma_addr, skb->len, DMA_TO_DEVICE);
+
+				dev_kfree_skb(skb);
+
+				lp->stats.tx_errors++;
+				lp->stats.tx_aborted_errors++;
+
+				ptr->v_next = NULL;
+				ptr->b_next = I596_NULL;
+				tx_cmd->cmd.command = 0;  /* Mark as free */
+				break;
+			}
+		default:
+			ptr->v_next = NULL;
+			ptr->b_next = I596_NULL;
+		}
+		CHECK_WBACK_INV(ptr, sizeof(struct i596_cmd));
+	}
+
+	wait_cmd(dev, lp, 100, "i596_cleanup_cmd timed out");
+	lp->scb.cmd = I596_NULL;
+	CHECK_WBACK(&(lp->scb), sizeof(struct i596_scb));
+}
+
+
+static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
+{
+	unsigned long flags;
+
+	DEB(DEB_RESET, printk("i596_reset\n"));
+
+	spin_lock_irqsave (&lp->lock, flags);
+
+	wait_cmd(dev, lp, 100, "i596_reset timed out");
+
+	netif_stop_queue(dev);
+
+	/* FIXME: this command might cause an lpmc */
+	lp->scb.command = CUC_ABORT | RX_ABORT;
+	CHECK_WBACK(&(lp->scb), sizeof(struct i596_scb));
+	CA(dev);
+
+	/* wait for shutdown */
+	wait_cmd(dev, lp, 1000, "i596_reset 2 timed out");
+	spin_unlock_irqrestore (&lp->lock, flags);
+
+	i596_cleanup_cmd(dev,lp);
+	i596_rx(dev);
+
+	netif_start_queue(dev);
+	init_i596_mem(dev);
+}
+
+
+static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
+{
+	struct i596_private *lp = dev->priv;
+	unsigned long flags;
+
+	DEB(DEB_ADDCMD, printk("i596_add_cmd cmd_head %p\n", lp->cmd_head));
+
+	cmd->status = 0;
+	cmd->command |= (CMD_EOL | CMD_INTR);
+	cmd->v_next = NULL;
+	cmd->b_next = I596_NULL;
+	CHECK_WBACK(cmd, sizeof(struct i596_cmd));
+
+	spin_lock_irqsave (&lp->lock, flags);
+
+	if (lp->cmd_head != NULL) {
+		lp->cmd_tail->v_next = cmd;
+		lp->cmd_tail->b_next = WSWAPcmd(virt_to_dma(lp,&cmd->status));
+		CHECK_WBACK(lp->cmd_tail, sizeof(struct i596_cmd));
+	} else {
+		lp->cmd_head = cmd;
+		wait_cmd(dev, lp, 100, "i596_add_cmd timed out");
+		lp->scb.cmd = WSWAPcmd(virt_to_dma(lp,&cmd->status));
+		lp->scb.command = CUC_START;
+		CHECK_WBACK(&(lp->scb), sizeof(struct i596_scb));
+		CA(dev);
+	}
+	lp->cmd_tail = cmd;
+	lp->cmd_backlog++;
+
+	spin_unlock_irqrestore (&lp->lock, flags);
+
+	if (lp->cmd_backlog > max_cmd_backlog) {
+		unsigned long tickssofar = jiffies - lp->last_cmd;
+
+		if (tickssofar < ticks_limit)
+			return;
+
+		printk("%s: command unit timed out, status resetting.\n", dev->name);
+#if 1
+		i596_reset(dev, lp);
+#endif
+	}
+}
+
+#if 0
+/* this function makes a perfectly adequate probe...  but we have a
+   device list */
+static int i596_test(struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	volatile int *tint;
+	u32 data;
+
+	tint = (volatile int *)(&(lp->scp));
+	data = virt_to_dma(lp,tint);
+	
+	tint[1] = -1;
+	CHECK_WBACK(tint,PAGE_SIZE);
+
+	MPU_PORT(dev, 1, data);
+
+	for(data = 1000000; data; data--) {
+		CHECK_INV(tint,PAGE_SIZE);
+		if(tint[1] != -1)
+			break;
+
+	}
+
+	printk("i596_test result %d\n", tint[1]);
+
+}
+#endif
+
+
+static int i596_open(struct net_device *dev)
+{
+	DEB(DEB_OPEN, printk("%s: i596_open() irq %d.\n", dev->name, dev->irq));
+
+	if (request_irq(dev->irq, &i596_interrupt, 0, "i82596", dev)) {
+		printk("%s: IRQ %d not free\n", dev->name, dev->irq);
+		goto out;
+	}
+
+	init_rx_bufs(dev);
+
+	if (init_i596_mem(dev)) {
+		printk("%s: Failed to init memory\n", dev->name);
+		goto out_remove_rx_bufs;
+	}
+
+	netif_start_queue(dev);
+
+	return 0;
+
+out_remove_rx_bufs:
+	remove_rx_bufs(dev);
+	free_irq(dev->irq, dev);
+out:
+	return -EAGAIN;
+}
+
+static void i596_tx_timeout (struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+
+	/* Transmitter timeout, serious problems. */
+	DEB(DEB_ERRORS, printk("%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) {
+		DEB(DEB_ERRORS, printk("Resetting board.\n"));
+		/* Shutdown and restart */
+		i596_reset (dev, lp);
+	} else {
+		/* Issue a channel attention signal */
+		DEB(DEB_ERRORS, printk("Kicking board.\n"));
+		lp->scb.command = CUC_START | RX_START;
+		CHECK_WBACK_INV(&(lp->scb), sizeof(struct i596_scb));
+		CA (dev);
+		lp->last_restart = lp->stats.tx_packets;
+	}
+
+	dev->trans_start = jiffies;
+	netif_wake_queue (dev);
+}
+
+
+static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	struct tx_cmd *tx_cmd;
+	struct i596_tbd *tbd;
+	short length = skb->len;
+	dev->trans_start = jiffies;
+
+	DEB(DEB_STARTTX, printk("%s: i596_start_xmit(%x,%p) called\n", dev->name,
+				skb->len, skb->data));
+
+	if (length < ETH_ZLEN) {
+		skb = skb_padto(skb, ETH_ZLEN);
+		if (skb == NULL)
+			return 0;
+		length = ETH_ZLEN;
+	}
+	
+	netif_stop_queue(dev);
+
+	tx_cmd = lp->tx_cmds + lp->next_tx_cmd;
+	tbd = lp->tbds + lp->next_tx_cmd;
+
+	if (tx_cmd->cmd.command) {
+		DEB(DEB_ERRORS, printk("%s: xmit ring full, dropping packet.\n",
+				dev->name));
+		lp->stats.tx_dropped++;
+
+		dev_kfree_skb(skb);
+	} else {
+		if (++lp->next_tx_cmd == TX_RING_SIZE)
+			lp->next_tx_cmd = 0;
+		tx_cmd->tbd = WSWAPtbd(virt_to_dma(lp,tbd));
+		tbd->next = I596_NULL;
+
+		tx_cmd->cmd.command = CMD_FLEX | CmdTx;
+		tx_cmd->skb = skb;
+
+		tx_cmd->pad = 0;
+		tx_cmd->size = 0;
+		tbd->pad = 0;
+		tbd->size = EOF | length;
+
+		tx_cmd->dma_addr = dma_map_single(lp->dev, skb->data, skb->len,
+				DMA_TO_DEVICE);
+		tbd->data = WSWAPchar(tx_cmd->dma_addr);
+
+		DEB(DEB_TXADDR,print_eth(skb->data, "tx-queued"));
+		CHECK_WBACK_INV(tx_cmd, sizeof(struct tx_cmd));
+		CHECK_WBACK_INV(tbd, sizeof(struct i596_tbd));
+		i596_add_cmd(dev, &tx_cmd->cmd);
+
+		lp->stats.tx_packets++;
+		lp->stats.tx_bytes += length;
+	}
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+static void print_eth(unsigned char *add, char *str)
+{
+	int i;
+
+	printk("i596 0x%p, ", add);
+	for (i = 0; i < 6; i++)
+		printk(" %02X", add[i + 6]);
+	printk(" -->");
+	for (i = 0; i < 6; i++)
+		printk(" %02X", add[i]);
+	printk(" %02X%02X, %s\n", add[12], add[13], str);
+}
+
+
+#define LAN_PROM_ADDR	0xF0810000
+
+static int __devinit i82596_probe(struct net_device *dev,
+				  struct device *gen_dev)
+{
+	int i;
+	struct i596_private *lp;
+	char eth_addr[6];
+	dma_addr_t dma_addr;
+
+	/* This lot is ensure things have been cache line aligned. */
+	if (sizeof(struct i596_rfd) != 32) {
+	    printk("82596: sizeof(struct i596_rfd) = %d\n",
+			    (int)sizeof(struct i596_rfd));
+	    return -ENODEV;
+	}
+	if ((sizeof(struct i596_rbd) % 32) != 0) {
+	    printk("82596: sizeof(struct i596_rbd) = %d\n",
+			    (int)sizeof(struct i596_rbd));
+	    return -ENODEV;
+	}
+	if ((sizeof(struct tx_cmd) % 32) != 0) {
+	    printk("82596: sizeof(struct tx_cmd) = %d\n",
+			    (int)sizeof(struct tx_cmd));
+	    return -ENODEV;
+	}
+	if (sizeof(struct i596_tbd) != 32) {
+	    printk("82596: sizeof(struct i596_tbd) = %d\n",
+			    (int)sizeof(struct i596_tbd));
+	    return -ENODEV;
+	}
+#ifndef __LP64__
+	if (sizeof(struct i596_private) > 4096) {
+	    printk("82596: sizeof(struct i596_private) = %d\n",
+			    (int)sizeof(struct i596_private));
+	    return -ENODEV;
+	}
+#endif
+
+	if (!dev->base_addr || !dev->irq)
+		return -ENODEV;
+
+	if (pdc_lan_station_id(eth_addr, dev->base_addr)) {
+		for (i=0; i < 6; i++) {
+			eth_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
+		}
+		printk(KERN_INFO "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
+	}
+
+	dev->mem_start = (unsigned long) dma_alloc_noncoherent(gen_dev, 
+		sizeof(struct i596_private), &dma_addr, GFP_KERNEL);
+	if (!dev->mem_start) {
+		printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = eth_addr[i];
+
+	/* The 82596-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->tx_timeout = i596_tx_timeout;
+	dev->watchdog_timeo = TX_TIMEOUT;
+
+	dev->priv = (void *)(dev->mem_start);
+
+	lp = dev->priv;
+	memset(lp, 0, sizeof(struct i596_private));
+
+	lp->scb.command = 0;
+	lp->scb.cmd = I596_NULL;
+	lp->scb.rfd = I596_NULL;
+	spin_lock_init(&lp->lock);
+	lp->dma_addr = dma_addr;
+	lp->dev = gen_dev;
+
+	CHECK_WBACK_INV(dev->mem_start, sizeof(struct i596_private));
+
+	i = register_netdev(dev);
+	if (i) {
+		lp = dev->priv;
+		dma_free_noncoherent(lp->dev, sizeof(struct i596_private), 
+				    (void *)dev->mem_start, lp->dma_addr);
+		return i;
+	};
+
+	DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx,", dev->name, dev->base_addr));
+	for (i = 0; i < 6; i++)
+		DEB(DEB_PROBE, printk(" %2.2X", dev->dev_addr[i]));
+	DEB(DEB_PROBE, printk(" IRQ %d.\n", dev->irq));
+	DEB(DEB_INIT, printk(KERN_INFO "%s: lp at 0x%p (%d bytes), lp->scb at 0x%p\n",
+		dev->name, lp, (int)sizeof(struct i596_private), &lp->scb));
+
+	return 0;
+}
+
+
+static irqreturn_t i596_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct i596_private *lp;
+	unsigned short status, ack_cmd = 0;
+
+	if (dev == NULL) {
+		printk("%s: irq %d for unknown device.\n", __FUNCTION__, irq);
+		return IRQ_NONE;
+	}
+
+	lp = dev->priv;
+
+	spin_lock (&lp->lock);
+
+	wait_cmd(dev, lp, 100, "i596 interrupt, timeout");
+	status = lp->scb.status;
+
+	DEB(DEB_INTS, printk("%s: i596 interrupt, IRQ %d, status %4.4x.\n",
+			dev->name, irq, status));
+
+	ack_cmd = status & 0xf000;
+
+	if (!ack_cmd) {
+		DEB(DEB_ERRORS, printk("%s: interrupt with no events\n", dev->name));
+		spin_unlock (&lp->lock);
+		return IRQ_NONE;
+	}
+
+	if ((status & 0x8000) || (status & 0x2000)) {
+		struct i596_cmd *ptr;
+
+		if ((status & 0x8000))
+			DEB(DEB_INTS, printk("%s: i596 interrupt completed command.\n", dev->name));
+		if ((status & 0x2000))
+			DEB(DEB_INTS, printk("%s: i596 interrupt command unit inactive %x.\n", dev->name, status & 0x0700));
+
+		while (lp->cmd_head != NULL) {
+			CHECK_INV(lp->cmd_head, sizeof(struct i596_cmd));
+			if (!(lp->cmd_head->status & STAT_C))
+				break;
+
+			ptr = lp->cmd_head;
+
+			DEB(DEB_STATUS, printk("cmd_head->status = %04x, ->command = %04x\n",
+				       lp->cmd_head->status, lp->cmd_head->command));
+			lp->cmd_head = ptr->v_next;
+			lp->cmd_backlog--;
+
+			switch ((ptr->command) & 0x7) {
+			case CmdTx:
+			    {
+				struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
+				struct sk_buff *skb = tx_cmd->skb;
+
+				if ((ptr->status) & STAT_OK) {
+					DEB(DEB_TXADDR, print_eth(skb->data, "tx-done"));
+				} else {
+					lp->stats.tx_errors++;
+					if ((ptr->status) & 0x0020)
+						lp->stats.collisions++;
+					if (!((ptr->status) & 0x0040))
+						lp->stats.tx_heartbeat_errors++;
+					if ((ptr->status) & 0x0400)
+						lp->stats.tx_carrier_errors++;
+					if ((ptr->status) & 0x0800)
+						lp->stats.collisions++;
+					if ((ptr->status) & 0x1000)
+						lp->stats.tx_aborted_errors++;
+				}
+				dma_unmap_single(lp->dev, tx_cmd->dma_addr, skb->len, DMA_TO_DEVICE);
+				dev_kfree_skb_irq(skb);
+
+				tx_cmd->cmd.command = 0; /* Mark free */
+				break;
+			    }
+			case CmdTDR:
+			    {
+				unsigned short status = ((struct tdr_cmd *)ptr)->status;
+
+				if (status & 0x8000) {
+					DEB(DEB_ANY, 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);
+
+					DEB(DEB_TDR, printk("%s: Time %d.\n", dev->name, status & 0x07ff));
+				}
+				break;
+			    }
+			case CmdConfigure:
+				/* Zap command so set_multicast_list() knows it is free */
+				ptr->command = 0;
+				break;
+			}
+			ptr->v_next = NULL;
+		        ptr->b_next = I596_NULL;
+			CHECK_WBACK(ptr, sizeof(struct i596_cmd));
+			lp->last_cmd = jiffies;
+		}
+
+		/* This mess is arranging that only the last of any outstanding
+		 * commands has the interrupt bit set.  Should probably really
+		 * only add to the cmd queue when the CU is stopped.
+		 */
+		ptr = lp->cmd_head;
+		while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
+			struct i596_cmd *prev = ptr;
+
+			ptr->command &= 0x1fff;
+			ptr = ptr->v_next;
+			CHECK_WBACK_INV(prev, sizeof(struct i596_cmd));
+		}
+
+		if ((lp->cmd_head != NULL))
+			ack_cmd |= CUC_START;
+		lp->scb.cmd = WSWAPcmd(virt_to_dma(lp,&lp->cmd_head->status));
+		CHECK_WBACK_INV(&lp->scb, sizeof(struct i596_scb));
+	}
+	if ((status & 0x1000) || (status & 0x4000)) {
+		if ((status & 0x4000))
+			DEB(DEB_INTS, printk("%s: i596 interrupt received a frame.\n", dev->name));
+		i596_rx(dev);
+		/* Only RX_START if stopped - RGH 07-07-96 */
+		if (status & 0x1000) {
+			if (netif_running(dev)) {
+				DEB(DEB_ERRORS, printk("%s: i596 interrupt receive unit inactive, status 0x%x\n", dev->name, status));
+				ack_cmd |= RX_START;
+				lp->stats.rx_errors++;
+				lp->stats.rx_fifo_errors++;
+				rebuild_rx_bufs(dev);
+			}
+		}
+	}
+	wait_cmd(dev, lp, 100, "i596 interrupt, timeout");
+	lp->scb.command = ack_cmd;
+	CHECK_WBACK(&lp->scb, sizeof(struct i596_scb));
+
+	/* DANGER: I suspect that some kind of interrupt
+	 acknowledgement aside from acking the 82596 might be needed 
+	 here...  but it's running acceptably without */
+
+	CA(dev);
+
+	wait_cmd(dev, lp, 100, "i596 interrupt, exit timeout");
+	DEB(DEB_INTS, printk("%s: exiting interrupt.\n", dev->name));
+
+	spin_unlock (&lp->lock);
+	return IRQ_HANDLED;
+}
+
+static int i596_close(struct net_device *dev)
+{
+	struct i596_private *lp = dev->priv;
+	unsigned long flags;
+
+	netif_stop_queue(dev);
+
+	DEB(DEB_INIT, printk("%s: Shutting down ethercard, status was %4.4x.\n",
+		       dev->name, lp->scb.status));
+
+	spin_lock_irqsave(&lp->lock, flags);
+
+	wait_cmd(dev, lp, 100, "close1 timed out");
+	lp->scb.command = CUC_ABORT | RX_ABORT;
+	CHECK_WBACK(&lp->scb, sizeof(struct i596_scb));
+
+	CA(dev);
+
+	wait_cmd(dev, lp, 100, "close2 timed out");
+	spin_unlock_irqrestore(&lp->lock, flags);
+	DEB(DEB_STRUCT,i596_display_data(dev));
+	i596_cleanup_cmd(dev,lp);
+
+	disable_irq(dev->irq);
+
+	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;
+	int config = 0, cnt;
+
+	DEB(DEB_MULTI, printk("%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
+		dev->name, dev->mc_count, dev->flags & IFF_PROMISC ? "ON" : "OFF",
+		dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
+
+	if ((dev->flags & IFF_PROMISC) && !(lp->cf_cmd.i596_config[8] & 0x01)) {
+		lp->cf_cmd.i596_config[8] |= 0x01;
+		config = 1;
+	}
+	if (!(dev->flags & IFF_PROMISC) && (lp->cf_cmd.i596_config[8] & 0x01)) {
+		lp->cf_cmd.i596_config[8] &= ~0x01;
+		config = 1;
+	}
+	if ((dev->flags & IFF_ALLMULTI) && (lp->cf_cmd.i596_config[11] & 0x20)) {
+		lp->cf_cmd.i596_config[11] &= ~0x20;
+		config = 1;
+	}
+	if (!(dev->flags & IFF_ALLMULTI) && !(lp->cf_cmd.i596_config[11] & 0x20)) {
+		lp->cf_cmd.i596_config[11] |= 0x20;
+		config = 1;
+	}
+	if (config) {
+		if (lp->cf_cmd.cmd.command)
+			printk("%s: config change request already queued\n",
+			       dev->name);
+		else {
+			lp->cf_cmd.cmd.command = CmdConfigure;
+			CHECK_WBACK_INV(&lp->cf_cmd, sizeof(struct cf_cmd));
+			i596_add_cmd(dev, &lp->cf_cmd.cmd);
+		}
+	}
+
+	cnt = dev->mc_count;
+	if (cnt > MAX_MC_CNT)
+	{
+		cnt = MAX_MC_CNT;
+		printk("%s: Only %d multicast addresses supported",
+			dev->name, cnt);
+	}
+	
+	if (dev->mc_count > 0) {
+		struct dev_mc_list *dmi;
+		unsigned char *cp;
+		struct mc_cmd *cmd;
+
+		cmd = &lp->mc_cmd;
+		cmd->cmd.command = CmdMulticastList;
+		cmd->mc_cnt = dev->mc_count * 6;
+		cp = cmd->mc_addrs;
+		for (dmi = dev->mc_list; cnt && dmi != NULL; dmi = dmi->next, cnt--, cp += 6) {
+			memcpy(cp, dmi->dmi_addr, 6);
+			if (i596_debug > 1)
+				DEB(DEB_MULTI, printk("%s: Adding address %02x:%02x:%02x:%02x:%02x:%02x\n",
+						dev->name, cp[0],cp[1],cp[2],cp[3],cp[4],cp[5]));
+		}
+		CHECK_WBACK_INV(&lp->mc_cmd, sizeof(struct mc_cmd));
+		i596_add_cmd(dev, &cmd->cmd);
+	}
+}
+
+MODULE_PARM(debug, "i");
+MODULE_PARM_DESC(debug, "lasi_82596 debug mask");
+static int debug = -1;
+
+static int num_drivers;
+static struct net_device *netdevs[MAX_DRIVERS];
+
+static int __devinit
+lan_init_chip(struct parisc_device *dev)
+{
+	struct	net_device *netdevice;
+	int	retval;
+
+	if (num_drivers >= MAX_DRIVERS) {
+		/* max count of possible i82596 drivers reached */
+		return -ENOMEM;
+	}
+
+	if (num_drivers == 0)
+		printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
+	
+	if (!dev->irq) {
+		printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
+			__FILE__, dev->hpa);
+		return -ENODEV;
+	}
+
+	printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", dev->hpa, dev->irq);
+
+	netdevice = alloc_etherdev(0);
+	if (!netdevice)
+		return -ENOMEM;
+
+	netdevice->base_addr = dev->hpa;
+	netdevice->irq = dev->irq;
+
+	retval = i82596_probe(netdevice, &dev->dev);
+	if (retval) {
+		free_netdev(netdevice);
+		return -ENODEV;
+	}
+
+	if (dev->id.sversion == 0x72) {
+		((struct i596_private *)netdevice->priv)->options = OPT_SWAP_PORT;
+	}
+
+	netdevs[num_drivers++] = netdevice;
+
+	return retval;
+}
+
+
+static struct parisc_device_id lan_tbl[] = {
+	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
+	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(parisc, lan_tbl);
+
+static struct parisc_driver lan_driver = {
+	.name		= "Apricot",
+	.id_table	= lan_tbl,
+	.probe		= lan_init_chip,
+};
+
+static int __devinit lasi_82596_init(void)
+{
+	if (debug >= 0)
+		i596_debug = debug;
+	return register_parisc_driver(&lan_driver);
+}
+
+module_init(lasi_82596_init);
+
+static void __exit lasi_82596_exit(void)
+{
+	int i;
+
+	for (i=0; i<MAX_DRIVERS; i++) {
+		struct i596_private *lp;
+		struct net_device *netdevice;
+		
+		netdevice = netdevs[i];
+		if (!netdevice) 
+			continue;
+		
+		unregister_netdev(netdevice);
+
+		lp = netdevice->priv;
+		dma_free_noncoherent(lp->dev, sizeof(struct i596_private), 
+				       (void *)netdevice->mem_start, lp->dma_addr);
+		free_netdev(netdevice);
+	}
+	num_drivers = 0;
+
+	unregister_parisc_driver(&lan_driver);
+}
+
+module_exit(lasi_82596_exit);