[NET]: Add Sun Cassini driver.

Written by Adrian Sun (asun@darksunrising.com).
Ported to 2.6.x by Tom 'spot' Callaway <tcallawa@redhat.com>.
Further cleaned up and integrated by David S. Miller

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5311 insertions, 0 deletions

diff --git a/drivers/net/cassini.c b/drivers/net/cassini.c
new file mode 100644
index 00000000000..69cb368247e
--- /dev/null
+++ b/drivers/net/cassini.c
@@ -0,0 +1,5311 @@
+/* cassini.c: Sun Microsystems Cassini(+) ethernet driver.
+ *
+ * Copyright (C) 2004 Sun Microsystems Inc.
+ * Copyright (C) 2003 Adrian Sun (asun@darksunrising.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * This driver uses the sungem driver (c) David Miller
+ * (davem@redhat.com) as its basis.
+ *
+ * The cassini chip has a number of features that distinguish it from
+ * the gem chip:
+ *  4 transmit descriptor rings that are used for either QoS (VLAN) or
+ *      load balancing (non-VLAN mode)
+ *  batching of multiple packets
+ *  multiple CPU dispatching
+ *  page-based RX descriptor engine with separate completion rings
+ *  Gigabit support (GMII and PCS interface)
+ *  MIF link up/down detection works
+ *
+ * RX is handled by page sized buffers that are attached as fragments to
+ * the skb. here's what's done:
+ *  -- driver allocates pages at a time and keeps reference counts
+ *     on them.
+ *  -- the upper protocol layers assume that the header is in the skb
+ *     itself. as a result, cassini will copy a small amount (64 bytes)
+ *     to make them happy.
+ *  -- driver appends the rest of the data pages as frags to skbuffs
+ *     and increments the reference count
+ *  -- on page reclamation, the driver swaps the page with a spare page.
+ *     if that page is still in use, it frees its reference to that page,
+ *     and allocates a new page for use. otherwise, it just recycles the
+ *     the page. 
+ *
+ * NOTE: cassini can parse the header. however, it's not worth it
+ *       as long as the network stack requires a header copy.
+ *
+ * TX has 4 queues. currently these queues are used in a round-robin
+ * fashion for load balancing. They can also be used for QoS. for that
+ * to work, however, QoS information needs to be exposed down to the driver
+ * level so that subqueues get targetted to particular transmit rings.
+ * alternatively, the queues can be configured via use of the all-purpose
+ * ioctl.
+ *
+ * RX DATA: the rx completion ring has all the info, but the rx desc
+ * ring has all of the data. RX can conceivably come in under multiple
+ * interrupts, but the INT# assignment needs to be set up properly by
+ * the BIOS and conveyed to the driver. PCI BIOSes don't know how to do
+ * that. also, the two descriptor rings are designed to distinguish between
+ * encrypted and non-encrypted packets, but we use them for buffering 
+ * instead.
+ *
+ * by default, the selective clear mask is set up to process rx packets.  
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/list.h>
+#include <linux/dma-mapping.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ethtool.h>
+#include <linux/crc32.h>
+#include <linux/random.h>
+#include <linux/mii.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+
+#include <net/checksum.h>
+
+#include <asm/atomic.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+
+#define cas_page_map(x)      kmap_atomic((x), KM_SKB_DATA_SOFTIRQ)
+#define cas_page_unmap(x)    kunmap_atomic((x), KM_SKB_DATA_SOFTIRQ)
+#define CAS_NCPUS            num_online_cpus()
+
+#if defined(CONFIG_CASSINI_NAPI) && defined(HAVE_NETDEV_POLL)
+#define USE_NAPI
+#define cas_skb_release(x)  netif_receive_skb(x)
+#else
+#define cas_skb_release(x)  netif_rx(x)
+#endif
+
+/* select which firmware to use */
+#define USE_HP_WORKAROUND     
+#define HP_WORKAROUND_DEFAULT /* select which firmware to use as default */
+#define CAS_HP_ALT_FIRMWARE   cas_prog_null /* alternate firmware */
+
+#include "cassini.h"
+
+#define USE_TX_COMPWB      /* use completion writeback registers */
+#define USE_CSMA_CD_PROTO  /* standard CSMA/CD */
+#define USE_RX_BLANK       /* hw interrupt mitigation */
+#undef USE_ENTROPY_DEV     /* don't test for entropy device */
+
+/* NOTE: these aren't useable unless PCI interrupts can be assigned.
+ * also, we need to make cp->lock finer-grained.
+ */
+#undef  USE_PCI_INTB
+#undef  USE_PCI_INTC
+#undef  USE_PCI_INTD
+#undef  USE_QOS
+
+#undef  USE_VPD_DEBUG       /* debug vpd information if defined */
+
+/* rx processing options */
+#define USE_PAGE_ORDER      /* specify to allocate large rx pages */
+#define RX_DONT_BATCH  0    /* if 1, don't batch flows */
+#define RX_COPY_ALWAYS 0    /* if 0, use frags */
+#define RX_COPY_MIN    64   /* copy a little to make upper layers happy */
+#undef  RX_COUNT_BUFFERS    /* define to calculate RX buffer stats */
+
+#define DRV_MODULE_NAME		"cassini"
+#define PFX DRV_MODULE_NAME	": "
+#define DRV_MODULE_VERSION	"1.4"
+#define DRV_MODULE_RELDATE	"1 July 2004"
+
+#define CAS_DEF_MSG_ENABLE	  \
+	(NETIF_MSG_DRV		| \
+	 NETIF_MSG_PROBE	| \
+	 NETIF_MSG_LINK		| \
+	 NETIF_MSG_TIMER	| \
+	 NETIF_MSG_IFDOWN	| \
+	 NETIF_MSG_IFUP		| \
+	 NETIF_MSG_RX_ERR	| \
+	 NETIF_MSG_TX_ERR)
+
+/* length of time before we decide the hardware is borked,
+ * and dev->tx_timeout() should be called to fix the problem
+ */
+#define CAS_TX_TIMEOUT			(HZ)
+#define CAS_LINK_TIMEOUT                (22*HZ/10)
+#define CAS_LINK_FAST_TIMEOUT           (1)
+
+/* timeout values for state changing. these specify the number
+ * of 10us delays to be used before giving up.
+ */
+#define STOP_TRIES_PHY 1000
+#define STOP_TRIES     5000
+
+/* specify a minimum frame size to deal with some fifo issues 
+ * max mtu == 2 * page size - ethernet header - 64 - swivel =
+ *            2 * page_size - 0x50
+ */
+#define CAS_MIN_FRAME			97
+#define CAS_1000MB_MIN_FRAME            255
+#define CAS_MIN_MTU                     60
+#define CAS_MAX_MTU                     min(((cp->page_size << 1) - 0x50), 9000)
+
+#if 1
+/*
+ * Eliminate these and use separate atomic counters for each, to
+ * avoid a race condition.
+ */
+#else
+#define CAS_RESET_MTU                   1
+#define CAS_RESET_ALL                   2
+#define CAS_RESET_SPARE                 3
+#endif
+
+static char version[] __devinitdata =
+	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+
+MODULE_AUTHOR("Adrian Sun (asun@darksunrising.com)");
+MODULE_DESCRIPTION("Sun Cassini(+) ethernet driver");
+MODULE_LICENSE("GPL");
+MODULE_PARM(cassini_debug, "i");
+MODULE_PARM_DESC(cassini_debug, "Cassini bitmapped debugging message enable value");
+MODULE_PARM(link_mode, "i");
+MODULE_PARM_DESC(link_mode, "default link mode");
+
+/*
+ * Work around for a PCS bug in which the link goes down due to the chip
+ * being confused and never showing a link status of "up."
+ */
+#define DEFAULT_LINKDOWN_TIMEOUT 5
+/* 
+ * Value in seconds, for user input.
+ */
+static int linkdown_timeout = DEFAULT_LINKDOWN_TIMEOUT;
+MODULE_PARM(linkdown_timeout, "i");
+MODULE_PARM_DESC(linkdown_timeout,
+"min reset interval in sec. for PCS linkdown issue; disabled if not positive");
+
+/*
+ * value in 'ticks' (units used by jiffies). Set when we init the
+ * module because 'HZ' in actually a function call on some flavors of
+ * Linux.  This will default to DEFAULT_LINKDOWN_TIMEOUT * HZ.
+ */
+static int link_transition_timeout;
+
+
+static int cassini_debug = -1;	/* -1 == use CAS_DEF_MSG_ENABLE as value */
+static int link_mode;
+
+static u16 link_modes[] __devinitdata = {
+	BMCR_ANENABLE,			 /* 0 : autoneg */
+	0,				 /* 1 : 10bt half duplex */
+	BMCR_SPEED100,			 /* 2 : 100bt half duplex */
+	BMCR_FULLDPLX,			 /* 3 : 10bt full duplex */
+	BMCR_SPEED100|BMCR_FULLDPLX,	 /* 4 : 100bt full duplex */
+	CAS_BMCR_SPEED1000|BMCR_FULLDPLX /* 5 : 1000bt full duplex */
+};
+
+static struct pci_device_id cas_pci_tbl[] __devinitdata = {
+	{ PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_CASSINI,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
+	{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SATURN,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, cas_pci_tbl);
+
+static void cas_set_link_modes(struct cas *cp);
+
+static inline void cas_lock_tx(struct cas *cp)
+{
+	int i;
+
+	for (i = 0; i < N_TX_RINGS; i++)  
+		spin_lock(&cp->tx_lock[i]);
+}
+
+static inline void cas_lock_all(struct cas *cp)
+{
+	spin_lock_irq(&cp->lock);
+	cas_lock_tx(cp);
+}
+
+/* WTZ: QA was finding deadlock problems with the previous
+ * versions after long test runs with multiple cards per machine.
+ * See if replacing cas_lock_all with safer versions helps. The
+ * symptoms QA is reporting match those we'd expect if interrupts
+ * aren't being properly restored, and we fixed a previous deadlock
+ * with similar symptoms by using save/restore versions in other
+ * places.
+ */
+#define cas_lock_all_save(cp, flags) \
+do { \
+	struct cas *xxxcp = (cp); \
+	spin_lock_irqsave(&xxxcp->lock, flags); \
+	cas_lock_tx(xxxcp); \
+} while (0)
+
+static inline void cas_unlock_tx(struct cas *cp)
+{
+	int i;
+
+	for (i = N_TX_RINGS; i > 0; i--)  
+		spin_unlock(&cp->tx_lock[i - 1]);  
+}
+
+static inline void cas_unlock_all(struct cas *cp)
+{
+	cas_unlock_tx(cp);
+	spin_unlock_irq(&cp->lock);
+}
+
+#define cas_unlock_all_restore(cp, flags) \
+do { \
+	struct cas *xxxcp = (cp); \
+	cas_unlock_tx(xxxcp); \
+	spin_unlock_irqrestore(&xxxcp->lock, flags); \
+} while (0)
+
+static void cas_disable_irq(struct cas *cp, const int ring)
+{
+	/* Make sure we won't get any more interrupts */
+	if (ring == 0) {
+		writel(0xFFFFFFFF, cp->regs + REG_INTR_MASK);
+		return;
+	}
+
+	/* disable completion interrupts and selectively mask */
+	if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
+		switch (ring) {
+#if defined (USE_PCI_INTB) || defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
+#ifdef USE_PCI_INTB
+		case 1:
+#endif
+#ifdef USE_PCI_INTC
+		case 2:
+#endif
+#ifdef USE_PCI_INTD
+		case 3:
+#endif
+			writel(INTRN_MASK_CLEAR_ALL | INTRN_MASK_RX_EN, 
+			       cp->regs + REG_PLUS_INTRN_MASK(ring));
+			break;
+#endif
+		default:
+			writel(INTRN_MASK_CLEAR_ALL, cp->regs +
+			       REG_PLUS_INTRN_MASK(ring));
+			break;
+		}
+	}
+}
+
+static inline void cas_mask_intr(struct cas *cp)
+{
+	int i;
+
+	for (i = 0; i < N_RX_COMP_RINGS; i++)
+		cas_disable_irq(cp, i);
+}
+
+static void cas_enable_irq(struct cas *cp, const int ring)
+{
+	if (ring == 0) { /* all but TX_DONE */
+		writel(INTR_TX_DONE, cp->regs + REG_INTR_MASK);
+		return;
+	}
+
+	if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
+		switch (ring) {
+#if defined (USE_PCI_INTB) || defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
+#ifdef USE_PCI_INTB
+		case 1:
+#endif
+#ifdef USE_PCI_INTC
+		case 2:
+#endif
+#ifdef USE_PCI_INTD
+		case 3:
+#endif
+			writel(INTRN_MASK_RX_EN, cp->regs +
+			       REG_PLUS_INTRN_MASK(ring));
+			break;
+#endif
+		default:
+			break;
+		}
+	}
+}
+
+static inline void cas_unmask_intr(struct cas *cp)
+{
+	int i;
+
+	for (i = 0; i < N_RX_COMP_RINGS; i++)
+		cas_enable_irq(cp, i);
+}
+
+static inline void cas_entropy_gather(struct cas *cp)
+{
+#ifdef USE_ENTROPY_DEV
+	if ((cp->cas_flags & CAS_FLAG_ENTROPY_DEV) == 0)
+		return;
+
+	batch_entropy_store(readl(cp->regs + REG_ENTROPY_IV),
+			    readl(cp->regs + REG_ENTROPY_IV),
+			    sizeof(uint64_t)*8);
+#endif
+}
+
+static inline void cas_entropy_reset(struct cas *cp)
+{
+#ifdef USE_ENTROPY_DEV
+	if ((cp->cas_flags & CAS_FLAG_ENTROPY_DEV) == 0)
+		return;
+
+	writel(BIM_LOCAL_DEV_PAD | BIM_LOCAL_DEV_PROM | BIM_LOCAL_DEV_EXT, 
+	       cp->regs + REG_BIM_LOCAL_DEV_EN);
+	writeb(ENTROPY_RESET_STC_MODE, cp->regs + REG_ENTROPY_RESET);
+	writeb(0x55, cp->regs + REG_ENTROPY_RAND_REG);
+
+	/* if we read back 0x0, we don't have an entropy device */
+	if (readb(cp->regs + REG_ENTROPY_RAND_REG) == 0)
+		cp->cas_flags &= ~CAS_FLAG_ENTROPY_DEV;
+#endif
+}
+
+/* access to the phy. the following assumes that we've initialized the MIF to 
+ * be in frame rather than bit-bang mode
+ */
+static u16 cas_phy_read(struct cas *cp, int reg)
+{
+	u32 cmd;
+	int limit = STOP_TRIES_PHY;
+
+	cmd = MIF_FRAME_ST | MIF_FRAME_OP_READ;
+	cmd |= CAS_BASE(MIF_FRAME_PHY_ADDR, cp->phy_addr);
+	cmd |= CAS_BASE(MIF_FRAME_REG_ADDR, reg);
+	cmd |= MIF_FRAME_TURN_AROUND_MSB;
+	writel(cmd, cp->regs + REG_MIF_FRAME);
+	
+	/* poll for completion */
+	while (limit-- > 0) {
+		udelay(10);
+		cmd = readl(cp->regs + REG_MIF_FRAME);
+		if (cmd & MIF_FRAME_TURN_AROUND_LSB)
+			return (cmd & MIF_FRAME_DATA_MASK);
+	}
+	return 0xFFFF; /* -1 */
+}
+
+static int cas_phy_write(struct cas *cp, int reg, u16 val)
+{
+	int limit = STOP_TRIES_PHY;
+	u32 cmd;
+
+	cmd = MIF_FRAME_ST | MIF_FRAME_OP_WRITE;
+	cmd |= CAS_BASE(MIF_FRAME_PHY_ADDR, cp->phy_addr);
+	cmd |= CAS_BASE(MIF_FRAME_REG_ADDR, reg);
+	cmd |= MIF_FRAME_TURN_AROUND_MSB;
+	cmd |= val & MIF_FRAME_DATA_MASK;
+	writel(cmd, cp->regs + REG_MIF_FRAME);
+	
+	/* poll for completion */
+	while (limit-- > 0) {
+		udelay(10);
+		cmd = readl(cp->regs + REG_MIF_FRAME);
+		if (cmd & MIF_FRAME_TURN_AROUND_LSB)
+			return 0;
+	}
+	return -1;
+}
+
+static void cas_phy_powerup(struct cas *cp)
+{
+	u16 ctl = cas_phy_read(cp, MII_BMCR);	
+
+	if ((ctl & BMCR_PDOWN) == 0)
+		return;
+	ctl &= ~BMCR_PDOWN;
+	cas_phy_write(cp, MII_BMCR, ctl);
+}
+
+static void cas_phy_powerdown(struct cas *cp)
+{
+	u16 ctl = cas_phy_read(cp, MII_BMCR);	
+
+	if (ctl & BMCR_PDOWN)
+		return;
+	ctl |= BMCR_PDOWN;
+	cas_phy_write(cp, MII_BMCR, ctl);
+}
+
+/* cp->lock held. note: the last put_page will free the buffer */
+static int cas_page_free(struct cas *cp, cas_page_t *page)
+{
+	pci_unmap_page(cp->pdev, page->dma_addr, cp->page_size, 
+		       PCI_DMA_FROMDEVICE);
+	__free_pages(page->buffer, cp->page_order);
+	kfree(page);
+	return 0;
+}
+
+#ifdef RX_COUNT_BUFFERS
+#define RX_USED_ADD(x, y)       ((x)->used += (y))
+#define RX_USED_SET(x, y)       ((x)->used  = (y))
+#else
+#define RX_USED_ADD(x, y) 
+#define RX_USED_SET(x, y)
+#endif
+
+/* local page allocation routines for the receive buffers. jumbo pages
+ * require at least 8K contiguous and 8K aligned buffers.
+ */
+static cas_page_t *cas_page_alloc(struct cas *cp, const int flags)
+{
+	cas_page_t *page;
+
+	page = kmalloc(sizeof(cas_page_t), flags);
+	if (!page)
+		return NULL;
+
+	INIT_LIST_HEAD(&page->list);
+	RX_USED_SET(page, 0);
+	page->buffer = alloc_pages(flags, cp->page_order);
+	if (!page->buffer)
+		goto page_err;
+	page->dma_addr = pci_map_page(cp->pdev, page->buffer, 0,
+				      cp->page_size, PCI_DMA_FROMDEVICE);
+	return page;
+
+page_err:
+	kfree(page);
+	return NULL;
+}
+
+/* initialize spare pool of rx buffers, but allocate during the open */
+static void cas_spare_init(struct cas *cp)
+{
+  	spin_lock(&cp->rx_inuse_lock);
+	INIT_LIST_HEAD(&cp->rx_inuse_list);
+	spin_unlock(&cp->rx_inuse_lock);
+
+	spin_lock(&cp->rx_spare_lock);
+	INIT_LIST_HEAD(&cp->rx_spare_list);
+	cp->rx_spares_needed = RX_SPARE_COUNT;
+	spin_unlock(&cp->rx_spare_lock);
+}
+
+/* used on close. free all the spare buffers. */
+static void cas_spare_free(struct cas *cp)
+{
+	struct list_head list, *elem, *tmp;
+
+	/* free spare buffers */
+	INIT_LIST_HEAD(&list);
+	spin_lock(&cp->rx_spare_lock);
+	list_splice(&cp->rx_spare_list, &list);
+	INIT_LIST_HEAD(&cp->rx_spare_list);
+	spin_unlock(&cp->rx_spare_lock);
+	list_for_each_safe(elem, tmp, &list) {
+		cas_page_free(cp, list_entry(elem, cas_page_t, list));
+	}
+
+	INIT_LIST_HEAD(&list);
+#if 1
+	/*
+	 * Looks like Adrian had protected this with a different
+	 * lock than used everywhere else to manipulate this list.
+	 */
+	spin_lock(&cp->rx_inuse_lock);
+	list_splice(&cp->rx_inuse_list, &list);
+	INIT_LIST_HEAD(&cp->rx_inuse_list);
+	spin_unlock(&cp->rx_inuse_lock);
+#else
+	spin_lock(&cp->rx_spare_lock);
+	list_splice(&cp->rx_inuse_list, &list);
+	INIT_LIST_HEAD(&cp->rx_inuse_list);
+	spin_unlock(&cp->rx_spare_lock);
+#endif
+	list_for_each_safe(elem, tmp, &list) {
+		cas_page_free(cp, list_entry(elem, cas_page_t, list));
+	}
+}
+
+/* replenish spares if needed */
+static void cas_spare_recover(struct cas *cp, const int flags)
+{
+	struct list_head list, *elem, *tmp;
+	int needed, i;
+
+	/* check inuse list. if we don't need any more free buffers,
+	 * just free it
+	 */
+
+	/* make a local copy of the list */
+	INIT_LIST_HEAD(&list);
+	spin_lock(&cp->rx_inuse_lock);
+	list_splice(&cp->rx_inuse_list, &list);
+	INIT_LIST_HEAD(&cp->rx_inuse_list);
+	spin_unlock(&cp->rx_inuse_lock);
+	
+	list_for_each_safe(elem, tmp, &list) {
+		cas_page_t *page = list_entry(elem, cas_page_t, list);
+
+		if (page_count(page->buffer) > 1) 
+			continue;
+
+		list_del(elem);
+		spin_lock(&cp->rx_spare_lock);
+		if (cp->rx_spares_needed > 0) {
+			list_add(elem, &cp->rx_spare_list);
+			cp->rx_spares_needed--;
+			spin_unlock(&cp->rx_spare_lock);
+		} else {
+			spin_unlock(&cp->rx_spare_lock);
+			cas_page_free(cp, page);
+		}
+	}
+
+	/* put any inuse buffers back on the list */
+	if (!list_empty(&list)) {
+		spin_lock(&cp->rx_inuse_lock);
+		list_splice(&list, &cp->rx_inuse_list);
+		spin_unlock(&cp->rx_inuse_lock);
+	}
+	
+	spin_lock(&cp->rx_spare_lock);
+	needed = cp->rx_spares_needed;
+	spin_unlock(&cp->rx_spare_lock);
+	if (!needed)
+		return;
+
+	/* we still need spares, so try to allocate some */
+	INIT_LIST_HEAD(&list);
+	i = 0;
+	while (i < needed) {
+		cas_page_t *spare = cas_page_alloc(cp, flags);
+		if (!spare) 
+			break;
+		list_add(&spare->list, &list);
+		i++;
+	}
+
+	spin_lock(&cp->rx_spare_lock);
+	list_splice(&list, &cp->rx_spare_list);
+	cp->rx_spares_needed -= i;
+	spin_unlock(&cp->rx_spare_lock);
+}
+
+/* pull a page from the list. */
+static cas_page_t *cas_page_dequeue(struct cas *cp)
+{
+	struct list_head *entry;
+	int recover;
+
+	spin_lock(&cp->rx_spare_lock);
+	if (list_empty(&cp->rx_spare_list)) {
+		/* try to do a quick recovery */
+		spin_unlock(&cp->rx_spare_lock);
+		cas_spare_recover(cp, GFP_ATOMIC);
+		spin_lock(&cp->rx_spare_lock);
+		if (list_empty(&cp->rx_spare_list)) {
+			if (netif_msg_rx_err(cp))
+				printk(KERN_ERR "%s: no spare buffers "
+				       "available.\n", cp->dev->name);
+			spin_unlock(&cp->rx_spare_lock);
+			return NULL;
+		}
+	}
+
+	entry = cp->rx_spare_list.next;
+	list_del(entry);
+	recover = ++cp->rx_spares_needed;
+	spin_unlock(&cp->rx_spare_lock);
+
+	/* trigger the timer to do the recovery */
+	if ((recover & (RX_SPARE_RECOVER_VAL - 1)) == 0) {
+#if 1
+		atomic_inc(&cp->reset_task_pending);
+		atomic_inc(&cp->reset_task_pending_spare);
+		schedule_work(&cp->reset_task);
+#else
+		atomic_set(&cp->reset_task_pending, CAS_RESET_SPARE);
+		schedule_work(&cp->reset_task);
+#endif
+	}
+	return list_entry(entry, cas_page_t, list);
+}
+
+
+static void cas_mif_poll(struct cas *cp, const int enable)
+{
+	u32 cfg;
+	
+	cfg  = readl(cp->regs + REG_MIF_CFG); 
+	cfg &= (MIF_CFG_MDIO_0 | MIF_CFG_MDIO_1);
+
+	if (cp->phy_type & CAS_PHY_MII_MDIO1)
+		cfg |= MIF_CFG_PHY_SELECT; 
+
+	/* poll and interrupt on link status change. */
+	if (enable) {
+		cfg |= MIF_CFG_POLL_EN;
+		cfg |= CAS_BASE(MIF_CFG_POLL_REG, MII_BMSR);
+		cfg |= CAS_BASE(MIF_CFG_POLL_PHY, cp->phy_addr);
+	}
+	writel((enable) ? ~(BMSR_LSTATUS | BMSR_ANEGCOMPLETE) : 0xFFFF, 
+	       cp->regs + REG_MIF_MASK); 
+	writel(cfg, cp->regs + REG_MIF_CFG);
+}
+
+/* Must be invoked under cp->lock */
+static void cas_begin_auto_negotiation(struct cas *cp, struct ethtool_cmd *ep)
+{
+	u16 ctl;
+#if 1
+	int lcntl;
+	int changed = 0;
+	int oldstate = cp->lstate;
+	int link_was_not_down = !(oldstate == link_down);
+#endif
+	/* Setup link parameters */
+	if (!ep)
+		goto start_aneg;
+	lcntl = cp->link_cntl;
+	if (ep->autoneg == AUTONEG_ENABLE)
+		cp->link_cntl = BMCR_ANENABLE;
+	else {
+		cp->link_cntl = 0;
+		if (ep->speed == SPEED_100)
+			cp->link_cntl |= BMCR_SPEED100;
+		else if (ep->speed == SPEED_1000)
+			cp->link_cntl |= CAS_BMCR_SPEED1000;
+		if (ep->duplex == DUPLEX_FULL)
+			cp->link_cntl |= BMCR_FULLDPLX;
+	}
+#if 1
+	changed = (lcntl != cp->link_cntl);
+#endif
+start_aneg:
+	if (cp->lstate == link_up) {
+		printk(KERN_INFO "%s: PCS link down.\n",
+		       cp->dev->name);
+	} else {
+		if (changed) {
+			printk(KERN_INFO "%s: link configuration changed\n",
+			       cp->dev->name);
+		}
+	}
+	cp->lstate = link_down;
+	cp->link_transition = LINK_TRANSITION_LINK_DOWN;
+	if (!cp->hw_running)
+		return;
+#if 1
+	/*
+	 * WTZ: If the old state was link_up, we turn off the carrier
+	 * to replicate everything we do elsewhere on a link-down
+	 * event when we were already in a link-up state..  
+	 */
+	if (oldstate == link_up)
+		netif_carrier_off(cp->dev);
+	if (changed  && link_was_not_down) {
+		/*
+		 * WTZ: This branch will simply schedule a full reset after
+		 * we explicitly changed link modes in an ioctl. See if this
+		 * fixes the link-problems we were having for forced mode. 
+		 */
+		atomic_inc(&cp->reset_task_pending);
+		atomic_inc(&cp->reset_task_pending_all);
+		schedule_work(&cp->reset_task);
+		cp->timer_ticks = 0;
+		mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
+		return;
+	}
+#endif
+	if (cp->phy_type & CAS_PHY_SERDES) {
+		u32 val = readl(cp->regs + REG_PCS_MII_CTRL);
+
+		if (cp->link_cntl & BMCR_ANENABLE) {
+			val |= (PCS_MII_RESTART_AUTONEG | PCS_MII_AUTONEG_EN);
+			cp->lstate = link_aneg;
+		} else {
+			if (cp->link_cntl & BMCR_FULLDPLX)
+				val |= PCS_MII_CTRL_DUPLEX;
+			val &= ~PCS_MII_AUTONEG_EN;
+			cp->lstate = link_force_ok;
+		}
+		cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
+		writel(val, cp->regs + REG_PCS_MII_CTRL);
+
+	} else {
+		cas_mif_poll(cp, 0);
+		ctl = cas_phy_read(cp, MII_BMCR);
+		ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | 
+			 CAS_BMCR_SPEED1000 | BMCR_ANENABLE);
+		ctl |= cp->link_cntl;
+		if (ctl & BMCR_ANENABLE) {
+			ctl |= BMCR_ANRESTART;
+			cp->lstate = link_aneg;
+		} else {
+			cp->lstate = link_force_ok;
+		}
+		cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
+		cas_phy_write(cp, MII_BMCR, ctl);
+		cas_mif_poll(cp, 1);
+	}
+
+	cp->timer_ticks = 0;
+	mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
+}
+
+/* Must be invoked under cp->lock. */
+static int cas_reset_mii_phy(struct cas *cp)
+{
+	int limit = STOP_TRIES_PHY;
+	u16 val;
+	
+	cas_phy_write(cp, MII_BMCR, BMCR_RESET);
+	udelay(100);
+	while (limit--) {
+		val = cas_phy_read(cp, MII_BMCR);
+		if ((val & BMCR_RESET) == 0)
+			break;
+		udelay(10);
+	}
+	return (limit <= 0);
+}
+
+static void cas_saturn_firmware_load(struct cas *cp)
+{
+	cas_saturn_patch_t *patch = cas_saturn_patch;
+
+	cas_phy_powerdown(cp);
+
+	/* expanded memory access mode */
+	cas_phy_write(cp, DP83065_MII_MEM, 0x0);
+
+	/* pointer configuration for new firmware */
+	cas_phy_write(cp, DP83065_MII_REGE, 0x8ff9);
+	cas_phy_write(cp, DP83065_MII_REGD, 0xbd);
+	cas_phy_write(cp, DP83065_MII_REGE, 0x8ffa);
+	cas_phy_write(cp, DP83065_MII_REGD, 0x82);
+	cas_phy_write(cp, DP83065_MII_REGE, 0x8ffb);
+	cas_phy_write(cp, DP83065_MII_REGD, 0x0);
+	cas_phy_write(cp, DP83065_MII_REGE, 0x8ffc);
+	cas_phy_write(cp, DP83065_MII_REGD, 0x39);
+
+	/* download new firmware */
+	cas_phy_write(cp, DP83065_MII_MEM, 0x1);
+	cas_phy_write(cp, DP83065_MII_REGE, patch->addr);
+	while (patch->addr) {
+		cas_phy_write(cp, DP83065_MII_REGD, patch->val);
+		patch++;
+	}
+
+	/* enable firmware */
+	cas_phy_write(cp, DP83065_MII_REGE, 0x8ff8);
+	cas_phy_write(cp, DP83065_MII_REGD, 0x1);
+}
+
+
+/* phy initialization */
+static void cas_phy_init(struct cas *cp)
+{
+	u16 val;
+
+	/* if we're in MII/GMII mode, set up phy */
+	if (CAS_PHY_MII(cp->phy_type)) {
+		writel(PCS_DATAPATH_MODE_MII,
+		       cp->regs + REG_PCS_DATAPATH_MODE);
+
+		cas_mif_poll(cp, 0);
+		cas_reset_mii_phy(cp); /* take out of isolate mode */
+
+		if (PHY_LUCENT_B0 == cp->phy_id) {
+			/* workaround link up/down issue with lucent */
+			cas_phy_write(cp, LUCENT_MII_REG, 0x8000);
+			cas_phy_write(cp, MII_BMCR, 0x00f1);
+			cas_phy_write(cp, LUCENT_MII_REG, 0x0);
+
+		} else if (PHY_BROADCOM_B0 == (cp->phy_id & 0xFFFFFFFC)) {
+			/* workarounds for broadcom phy */
+			cas_phy_write(cp, BROADCOM_MII_REG8, 0x0C20);
+			cas_phy_write(cp, BROADCOM_MII_REG7, 0x0012);
+			cas_phy_write(cp, BROADCOM_MII_REG5, 0x1804);
+			cas_phy_write(cp, BROADCOM_MII_REG7, 0x0013);
+			cas_phy_write(cp, BROADCOM_MII_REG5, 0x1204);
+			cas_phy_write(cp, BROADCOM_MII_REG7, 0x8006);
+			cas_phy_write(cp, BROADCOM_MII_REG5, 0x0132);
+			cas_phy_write(cp, BROADCOM_MII_REG7, 0x8006);
+			cas_phy_write(cp, BROADCOM_MII_REG5, 0x0232);
+			cas_phy_write(cp, BROADCOM_MII_REG7, 0x201F);
+			cas_phy_write(cp, BROADCOM_MII_REG5, 0x0A20);
+
+		} else if (PHY_BROADCOM_5411 == cp->phy_id) {
+			val = cas_phy_read(cp, BROADCOM_MII_REG4);
+			val = cas_phy_read(cp, BROADCOM_MII_REG4);
+			if (val & 0x0080) {
+				/* link workaround */
+				cas_phy_write(cp, BROADCOM_MII_REG4, 
+					      val & ~0x0080);
+			}
+			
+		} else if (cp->cas_flags & CAS_FLAG_SATURN) {
+			writel((cp->phy_type & CAS_PHY_MII_MDIO0) ? 
+			       SATURN_PCFG_FSI : 0x0, 
+			       cp->regs + REG_SATURN_PCFG);
+
+			/* load firmware to address 10Mbps auto-negotiation
+			 * issue. NOTE: this will need to be changed if the 
+			 * default firmware gets fixed.
+			 */
+			if (PHY_NS_DP83065 == cp->phy_id) {
+				cas_saturn_firmware_load(cp);
+			}
+			cas_phy_powerup(cp);
+		}
+
+		/* advertise capabilities */
+		val = cas_phy_read(cp, MII_BMCR);
+		val &= ~BMCR_ANENABLE;
+		cas_phy_write(cp, MII_BMCR, val);
+		udelay(10);
+
+		cas_phy_write(cp, MII_ADVERTISE,
+			      cas_phy_read(cp, MII_ADVERTISE) |
+			      (ADVERTISE_10HALF | ADVERTISE_10FULL |
+			       ADVERTISE_100HALF | ADVERTISE_100FULL |
+			       CAS_ADVERTISE_PAUSE | 
+			       CAS_ADVERTISE_ASYM_PAUSE));
+		
+		if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
+			/* make sure that we don't advertise half
+			 * duplex to avoid a chip issue
+			 */
+			val  = cas_phy_read(cp, CAS_MII_1000_CTRL);
+			val &= ~CAS_ADVERTISE_1000HALF;
+			val |= CAS_ADVERTISE_1000FULL;
+			cas_phy_write(cp, CAS_MII_1000_CTRL, val);
+		}
+
+	} else {
+		/* reset pcs for serdes */
+		u32 val;
+		int limit;
+
+		writel(PCS_DATAPATH_MODE_SERDES,
+		       cp->regs + REG_PCS_DATAPATH_MODE);
+
+		/* enable serdes pins on saturn */
+		if (cp->cas_flags & CAS_FLAG_SATURN)
+			writel(0, cp->regs + REG_SATURN_PCFG);
+
+		/* Reset PCS unit. */
+		val = readl(cp->regs + REG_PCS_MII_CTRL);
+		val |= PCS_MII_RESET;
+		writel(val, cp->regs + REG_PCS_MII_CTRL);
+
+		limit = STOP_TRIES;
+		while (limit-- > 0) {
+			udelay(10);
+			if ((readl(cp->regs + REG_PCS_MII_CTRL) & 
+			     PCS_MII_RESET) == 0)
+				break;
+		}
+		if (limit <= 0)
+			printk(KERN_WARNING "%s: PCS reset bit would not "
+			       "clear [%08x].\n", cp->dev->name,
+			       readl(cp->regs + REG_PCS_STATE_MACHINE));
+
+		/* Make sure PCS is disabled while changing advertisement
+		 * configuration.
+		 */
+		writel(0x0, cp->regs + REG_PCS_CFG);
+
+		/* Advertise all capabilities except half-duplex. */
+		val  = readl(cp->regs + REG_PCS_MII_ADVERT);
+		val &= ~PCS_MII_ADVERT_HD;
+		val |= (PCS_MII_ADVERT_FD | PCS_MII_ADVERT_SYM_PAUSE | 
+			PCS_MII_ADVERT_ASYM_PAUSE);
+		writel(val, cp->regs + REG_PCS_MII_ADVERT);
+
+		/* enable PCS */
+		writel(PCS_CFG_EN, cp->regs + REG_PCS_CFG);
+
+		/* pcs workaround: enable sync detect */
+		writel(PCS_SERDES_CTRL_SYNCD_EN,
+		       cp->regs + REG_PCS_SERDES_CTRL);
+	}
+}
+
+
+static int cas_pcs_link_check(struct cas *cp)
+{
+	u32 stat, state_machine;
+	int retval = 0;
+
+	/* The link status bit latches on zero, so you must
+	 * read it twice in such a case to see a transition
+	 * to the link being up.
+	 */
+	stat = readl(cp->regs + REG_PCS_MII_STATUS);
+	if ((stat & PCS_MII_STATUS_LINK_STATUS) == 0)
+		stat = readl(cp->regs + REG_PCS_MII_STATUS);
+
+	/* The remote-fault indication is only valid
+	 * when autoneg has completed.
+	 */
+	if ((stat & (PCS_MII_STATUS_AUTONEG_COMP |
+		     PCS_MII_STATUS_REMOTE_FAULT)) ==
+	    (PCS_MII_STATUS_AUTONEG_COMP | PCS_MII_STATUS_REMOTE_FAULT)) {
+		if (netif_msg_link(cp))
+			printk(KERN_INFO "%s: PCS RemoteFault\n", 
+			       cp->dev->name);
+	}
+
+	/* work around link detection issue by querying the PCS state
+	 * machine directly.
+	 */
+	state_machine = readl(cp->regs + REG_PCS_STATE_MACHINE);
+	if ((state_machine & PCS_SM_LINK_STATE_MASK) != SM_LINK_STATE_UP) {
+		stat &= ~PCS_MII_STATUS_LINK_STATUS;
+	} else if (state_machine & PCS_SM_WORD_SYNC_STATE_MASK) {
+		stat |= PCS_MII_STATUS_LINK_STATUS;
+	}
+
+	if (stat & PCS_MII_STATUS_LINK_STATUS) {
+		if (cp->lstate != link_up) {
+			if (cp->opened) {
+				cp->lstate = link_up;
+				cp->link_transition = LINK_TRANSITION_LINK_UP;
+				
+				cas_set_link_modes(cp);
+				netif_carrier_on(cp->dev);
+			}
+		}
+	} else if (cp->lstate == link_up) {
+		cp->lstate = link_down;
+		if (link_transition_timeout != 0 &&
+		    cp->link_transition != LINK_TRANSITION_REQUESTED_RESET &&
+		    !cp->link_transition_jiffies_valid) {
+			/*
+			 * force a reset, as a workaround for the 
+			 * link-failure problem. May want to move this to a 
+			 * point a bit earlier in the sequence. If we had
+			 * generated a reset a short time ago, we'll wait for
+			 * the link timer to check the status until a
+			 * timer expires (link_transistion_jiffies_valid is
+			 * true when the timer is running.)  Instead of using
+			 * a system timer, we just do a check whenever the
+			 * link timer is running - this clears the flag after
+			 * a suitable delay.
+			 */
+			retval = 1;
+			cp->link_transition = LINK_TRANSITION_REQUESTED_RESET;
+			cp->link_transition_jiffies = jiffies;
+			cp->link_transition_jiffies_valid = 1;
+		} else {
+			cp->link_transition = LINK_TRANSITION_ON_FAILURE;
+		}
+		netif_carrier_off(cp->dev);
+		if (cp->opened && netif_msg_link(cp)) {
+			printk(KERN_INFO "%s: PCS link down.\n",
+			       cp->dev->name);
+		}
+
+		/* Cassini only: if you force a mode, there can be
+		 * sync problems on link down. to fix that, the following
+		 * things need to be checked:
+		 * 1) read serialink state register
+		 * 2) read pcs status register to verify link down.
+		 * 3) if link down and serial link == 0x03, then you need
+		 *    to global reset the chip.
+		 */
+		if ((cp->cas_flags & CAS_FLAG_REG_PLUS) == 0) {
+			/* should check to see if we're in a forced mode */
+			stat = readl(cp->regs + REG_PCS_SERDES_STATE);
+			if (stat == 0x03)
+				return 1;
+		}
+	} else if (cp->lstate == link_down) {
+		if (link_transition_timeout != 0 &&
+		    cp->link_transition != LINK_TRANSITION_REQUESTED_RESET &&
+		    !cp->link_transition_jiffies_valid) {
+			/* force a reset, as a workaround for the
+			 * link-failure problem.  May want to move
+			 * this to a point a bit earlier in the
+			 * sequence.
+			 */
+			retval = 1;
+			cp->link_transition = LINK_TRANSITION_REQUESTED_RESET;
+			cp->link_transition_jiffies = jiffies;
+			cp->link_transition_jiffies_valid = 1;
+		} else {
+			cp->link_transition = LINK_TRANSITION_STILL_FAILED;
+		}
+	}
+
+	return retval;
+}
+
+static int cas_pcs_interrupt(struct net_device *dev, 
+			     struct cas *cp, u32 status)
+{
+	u32 stat = readl(cp->regs + REG_PCS_INTR_STATUS);
+
+	if ((stat & PCS_INTR_STATUS_LINK_CHANGE) == 0) 
+		return 0;
+	return cas_pcs_link_check(cp);
+}
+
+static int cas_txmac_interrupt(struct net_device *dev, 
+			       struct cas *cp, u32 status)
+{
+	u32 txmac_stat = readl(cp->regs + REG_MAC_TX_STATUS);
+
+	if (!txmac_stat)
+		return 0;
+
+	if (netif_msg_intr(cp))
+		printk(KERN_DEBUG "%s: txmac interrupt, txmac_stat: 0x%x\n",
+			cp->dev->name, txmac_stat);
+
+	/* Defer timer expiration is quite normal,
+	 * don't even log the event.
+	 */
+	if ((txmac_stat & MAC_TX_DEFER_TIMER) &&
+	    !(txmac_stat & ~MAC_TX_DEFER_TIMER))
+		return 0;
+
+	spin_lock(&cp->stat_lock[0]);
+	if (txmac_stat & MAC_TX_UNDERRUN) {
+		printk(KERN_ERR "%s: TX MAC xmit underrun.\n",
+		       dev->name);
+		cp->net_stats[0].tx_fifo_errors++;
+	}
+
+	if (txmac_stat & MAC_TX_MAX_PACKET_ERR) {
+		printk(KERN_ERR "%s: TX MAC max packet size error.\n",
+		       dev->name);
+		cp->net_stats[0].tx_errors++;
+	}
+
+	/* The rest are all cases of one of the 16-bit TX
+	 * counters expiring.
+	 */
+	if (txmac_stat & MAC_TX_COLL_NORMAL)
+		cp->net_stats[0].collisions += 0x10000;
+
+	if (txmac_stat & MAC_TX_COLL_EXCESS) {
+		cp->net_stats[0].tx_aborted_errors += 0x10000;
+		cp->net_stats[0].collisions += 0x10000;
+	}
+
+	if (txmac_stat & MAC_TX_COLL_LATE) {
+		cp->net_stats[0].tx_aborted_errors += 0x10000;
+		cp->net_stats[0].collisions += 0x10000;
+	}
+	spin_unlock(&cp->stat_lock[0]);
+
+	/* We do not keep track of MAC_TX_COLL_FIRST and
+	 * MAC_TX_PEAK_ATTEMPTS events.
+	 */
+	return 0;
+}
+
+static void cas_load_firmware(struct cas *cp, cas_hp_inst_t *firmware) 
+{
+	cas_hp_inst_t *inst;
+	u32 val;
+	int i;
+
+	i = 0;
+	while ((inst = firmware) && inst->note) {
+		writel(i, cp->regs + REG_HP_INSTR_RAM_ADDR);
+
+		val = CAS_BASE(HP_INSTR_RAM_HI_VAL, inst->val);
+		val |= CAS_BASE(HP_INSTR_RAM_HI_MASK, inst->mask);
+		writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_HI);
+
+		val = CAS_BASE(HP_INSTR_RAM_MID_OUTARG, inst->outarg >> 10);
+		val |= CAS_BASE(HP_INSTR_RAM_MID_OUTOP, inst->outop);
+		val |= CAS_BASE(HP_INSTR_RAM_MID_FNEXT, inst->fnext);
+		val |= CAS_BASE(HP_INSTR_RAM_MID_FOFF, inst->foff);
+		val |= CAS_BASE(HP_INSTR_RAM_MID_SNEXT, inst->snext);
+		val |= CAS_BASE(HP_INSTR_RAM_MID_SOFF, inst->soff);
+		val |= CAS_BASE(HP_INSTR_RAM_MID_OP, inst->op);
+		writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_MID);
+
+		val = CAS_BASE(HP_INSTR_RAM_LOW_OUTMASK, inst->outmask);
+		val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTSHIFT, inst->outshift);
+		val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTEN, inst->outenab);
+		val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTARG, inst->outarg);
+		writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_LOW);
+		++firmware;
+		++i;
+	}
+}
+
+static void cas_init_rx_dma(struct cas *cp)
+{
+	u64 desc_dma = cp->block_dvma; 
+	u32 val;
+	int i, size;
+
+	/* rx free descriptors */
+	val = CAS_BASE(RX_CFG_SWIVEL, RX_SWIVEL_OFF_VAL); 
+	val |= CAS_BASE(RX_CFG_DESC_RING, RX_DESC_RINGN_INDEX(0));
+	val |= CAS_BASE(RX_CFG_COMP_RING, RX_COMP_RINGN_INDEX(0));
+	if ((N_RX_DESC_RINGS > 1) &&
+	    (cp->cas_flags & CAS_FLAG_REG_PLUS))  /* do desc 2 */
+		val |= CAS_BASE(RX_CFG_DESC_RING1, RX_DESC_RINGN_INDEX(1));
+	writel(val, cp->regs + REG_RX_CFG);
+
+	val = (unsigned long) cp->init_rxds[0] - 
+		(unsigned long) cp->init_block;
+	writel((desc_dma + val) >> 32, cp->regs + REG_RX_DB_HI);
+	writel((desc_dma + val) & 0xffffffff, cp->regs + REG_RX_DB_LOW);
+	writel(RX_DESC_RINGN_SIZE(0) - 4, cp->regs + REG_RX_KICK);
+
+	if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
+		/* rx desc 2 is for IPSEC packets. however, 
+		 * we don't it that for that purpose.
+		 */
+		val = (unsigned long) cp->init_rxds[1] - 
+			(unsigned long) cp->init_block;
+		writel((desc_dma + val) >> 32, cp->regs + REG_PLUS_RX_DB1_HI);
+		writel((desc_dma + val) & 0xffffffff, cp->regs + 
+		       REG_PLUS_RX_DB1_LOW);
+		writel(RX_DESC_RINGN_SIZE(1) - 4, cp->regs + 
+		       REG_PLUS_RX_KICK1);
+	}
+	
+	/* rx completion registers */
+	val = (unsigned long) cp->init_rxcs[0] - 
+		(unsigned long) cp->init_block;
+	writel((desc_dma + val) >> 32, cp->regs + REG_RX_CB_HI);
+	writel((desc_dma + val) & 0xffffffff, cp->regs + REG_RX_CB_LOW);
+
+	if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
+		/* rx comp 2-4 */
+		for (i = 1; i < MAX_RX_COMP_RINGS; i++) {
+			val = (unsigned long) cp->init_rxcs[i] - 
+				(unsigned long) cp->init_block;
+			writel((desc_dma + val) >> 32, cp->regs + 
+			       REG_PLUS_RX_CBN_HI(i));
+			writel((desc_dma + val) & 0xffffffff, cp->regs + 
+			       REG_PLUS_RX_CBN_LOW(i));
+		}
+	}
+
+	/* read selective clear regs to prevent spurious interrupts
+	 * on reset because complete == kick.
+	 * selective clear set up to prevent interrupts on resets
+	 */
+	readl(cp->regs + REG_INTR_STATUS_ALIAS);
+	writel(INTR_RX_DONE | INTR_RX_BUF_UNAVAIL, cp->regs + REG_ALIAS_CLEAR);
+	if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
+		for (i = 1; i < N_RX_COMP_RINGS; i++)
+			readl(cp->regs + REG_PLUS_INTRN_STATUS_ALIAS(i));
+
+		/* 2 is different from 3 and 4 */
+		if (N_RX_COMP_RINGS > 1)
+			writel(INTR_RX_DONE_ALT | INTR_RX_BUF_UNAVAIL_1, 
+			       cp->regs + REG_PLUS_ALIASN_CLEAR(1));
+
+		for (i = 2; i < N_RX_COMP_RINGS; i++) 
+			writel(INTR_RX_DONE_ALT, 
+			       cp->regs + REG_PLUS_ALIASN_CLEAR(i));
+	}
+
+	/* set up pause thresholds */
+	val  = CAS_BASE(RX_PAUSE_THRESH_OFF,
+			cp->rx_pause_off / RX_PAUSE_THRESH_QUANTUM);
+	val |= CAS_BASE(RX_PAUSE_THRESH_ON, 
+			cp->rx_pause_on / RX_PAUSE_THRESH_QUANTUM);
+	writel(val, cp->regs + REG_RX_PAUSE_THRESH);
+	
+	/* zero out dma reassembly buffers */
+	for (i = 0; i < 64; i++) {
+		writel(i, cp->regs + REG_RX_TABLE_ADDR);
+		writel(0x0, cp->regs + REG_RX_TABLE_DATA_LOW);
+		writel(0x0, cp->regs + REG_RX_TABLE_DATA_MID);
+		writel(0x0, cp->regs + REG_RX_TABLE_DATA_HI);
+	}
+
+	/* make sure address register is 0 for normal operation */
+	writel(0x0, cp->regs + REG_RX_CTRL_FIFO_ADDR);
+	writel(0x0, cp->regs + REG_RX_IPP_FIFO_ADDR);
+
+	/* interrupt mitigation */
+#ifdef USE_RX_BLANK
+	val = CAS_BASE(RX_BLANK_INTR_TIME, RX_BLANK_INTR_TIME_VAL);
+	val |= CAS_BASE(RX_BLANK_INTR_PKT, RX_BLANK_INTR_PKT_VAL);
+	writel(val, cp->regs + REG_RX_BLANK);
+#else
+	writel(0x0, cp->regs + REG_RX_BLANK);
+#endif
+
+	/* interrupt generation as a function of low water marks for
+	 * free desc and completion entries. these are used to trigger
+	 * housekeeping for rx descs. we don't use the free interrupt
+	 * as it's not very useful
+	 */
+	/* val = CAS_BASE(RX_AE_THRESH_FREE, RX_AE_FREEN_VAL(0)); */
+	val = CAS_BASE(RX_AE_THRESH_COMP, RX_AE_COMP_VAL);
+	writel(val, cp->regs + REG_RX_AE_THRESH);
+	if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
+		val = CAS_BASE(RX_AE1_THRESH_FREE, RX_AE_FREEN_VAL(1));
+		writel(val, cp->regs + REG_PLUS_RX_AE1_THRESH);
+	}
+
+	/* Random early detect registers. useful for congestion avoidance.
+	 * this should be tunable.
+	 */
+	writel(0x0, cp->regs + REG_RX_RED);
+	
+	/* receive page sizes. default == 2K (0x800) */
+	val = 0;
+	if (cp->page_size == 0x1000)
+		val = 0x1;
+	else if (cp->page_size == 0x2000)
+		val = 0x2;
+	else if (cp->page_size == 0x4000)
+		val = 0x3;
+	
+	/* round mtu + offset. constrain to page size. */
+	size = cp->dev->mtu + 64;
+	if (size > cp->page_size)
+		size = cp->page_size;
+
+	if (size <= 0x400)
+		i = 0x0;
+	else if (size <= 0x800)
+		i = 0x1;
+	else if (size <= 0x1000)
+		i = 0x2;
+	else
+		i = 0x3;
+
+	cp->mtu_stride = 1 << (i + 10);
+	val  = CAS_BASE(RX_PAGE_SIZE, val);
+	val |= CAS_BASE(RX_PAGE_SIZE_MTU_STRIDE, i); 
+	val |= CAS_BASE(RX_PAGE_SIZE_MTU_COUNT, cp->page_size >> (i + 10));
+	val |= CAS_BASE(RX_PAGE_SIZE_MTU_OFF, 0x1);
+	writel(val, cp->regs + REG_RX_PAGE_SIZE);
+	
+	/* enable the header parser if desired */
+	if (CAS_HP_FIRMWARE == cas_prog_null)
+		return;
+
+	val = CAS_BASE(HP_CFG_NUM_CPU, CAS_NCPUS > 63 ? 0 : CAS_NCPUS);
+	val |= HP_CFG_PARSE_EN | HP_CFG_SYN_INC_MASK;
+	val |= CAS_BASE(HP_CFG_TCP_THRESH, HP_TCP_THRESH_VAL);
+	writel(val, cp->regs + REG_HP_CFG);
+}
+
+static inline void cas_rxc_init(struct cas_rx_comp *rxc)
+{
+	memset(rxc, 0, sizeof(*rxc));
+	rxc->word4 = cpu_to_le64(RX_COMP4_ZERO); 
+}
+
+/* NOTE: we use the ENC RX DESC ring for spares. the rx_page[0,1]
+ * flipping is protected by the fact that the chip will not
+ * hand back the same page index while it's being processed.
+ */
+static inline cas_page_t *cas_page_spare(struct cas *cp, const int index)
+{
+	cas_page_t *page = cp->rx_pages[1][index];
+	cas_page_t *new;
+
+	if (page_count(page->buffer) == 1)
+		return page;
+
+	new = cas_page_dequeue(cp);
+	if (new) {
+		spin_lock(&cp->rx_inuse_lock);
+		list_add(&page->list, &cp->rx_inuse_list);
+		spin_unlock(&cp->rx_inuse_lock);
+	}
+	return new;
+}
+				   
+/* this needs to be changed if we actually use the ENC RX DESC ring */
+static cas_page_t *cas_page_swap(struct cas *cp, const int ring, 
+				 const int index)
+{
+	cas_page_t **page0 = cp->rx_pages[0];
+	cas_page_t **page1 = cp->rx_pages[1];
+
+	/* swap if buffer is in use */
+	if (page_count(page0[index]->buffer) > 1) {
+		cas_page_t *new = cas_page_spare(cp, index);
+		if (new) {
+			page1[index] = page0[index];
+			page0[index] = new;
+		}
+	} 
+	RX_USED_SET(page0[index], 0);
+	return page0[index];
+}
+
+static void cas_clean_rxds(struct cas *cp)
+{
+	/* only clean ring 0 as ring 1 is used for spare buffers */
+        struct cas_rx_desc *rxd = cp->init_rxds[0];
+	int i, size;
+
+	/* release all rx flows */
+	for (i = 0; i < N_RX_FLOWS; i++) {
+		struct sk_buff *skb;
+		while ((skb = __skb_dequeue(&cp->rx_flows[i]))) {
+			cas_skb_release(skb);
+		}
+	}
+
+	/* initialize descriptors */
+	size = RX_DESC_RINGN_SIZE(0);
+	for (i = 0; i < size; i++) {
+		cas_page_t *page = cas_page_swap(cp, 0, i);
+		rxd[i].buffer = cpu_to_le64(page->dma_addr);
+		rxd[i].index  = cpu_to_le64(CAS_BASE(RX_INDEX_NUM, i) | 
+					    CAS_BASE(RX_INDEX_RING, 0));
+	}
+
+	cp->rx_old[0]  = RX_DESC_RINGN_SIZE(0) - 4; 
+	cp->rx_last[0] = 0;
+	cp->cas_flags &= ~CAS_FLAG_RXD_POST(0);
+}
+
+static void cas_clean_rxcs(struct cas *cp)
+{
+	int i, j;
+
+	/* take ownership of rx comp descriptors */
+	memset(cp->rx_cur, 0, sizeof(*cp->rx_cur)*N_RX_COMP_RINGS);
+	memset(cp->rx_new, 0, sizeof(*cp->rx_new)*N_RX_COMP_RINGS);
+	for (i = 0; i < N_RX_COMP_RINGS; i++) {
+		struct cas_rx_comp *rxc = cp->init_rxcs[i];
+		for (j = 0; j < RX_COMP_RINGN_SIZE(i); j++) {
+			cas_rxc_init(rxc + j);
+		}
+	}
+}
+
+#if 0
+/* When we get a RX fifo overflow, the RX unit is probably hung
+ * so we do the following.
+ *
+ * If any part of the reset goes wrong, we return 1 and that causes the
+ * whole chip to be reset.
+ */
+static int cas_rxmac_reset(struct cas *cp)
+{
+	struct net_device *dev = cp->dev;
+	int limit;
+	u32 val;
+
+	/* First, reset MAC RX. */
+	writel(cp->mac_rx_cfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
+	for (limit = 0; limit < STOP_TRIES; limit++) {
+		if (!(readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_EN))
+			break;
+		udelay(10);
+	}
+	if (limit == STOP_TRIES) {
+		printk(KERN_ERR "%s: RX MAC will not disable, resetting whole "
+		       "chip.\n", dev->name);
+		return 1;
+	}
+
+	/* Second, disable RX DMA. */
+	writel(0, cp->regs + REG_RX_CFG);
+	for (limit = 0; limit < STOP_TRIES; limit++) {
+		if (!(readl(cp->regs + REG_RX_CFG) & RX_CFG_DMA_EN))
+			break;
+		udelay(10);
+	}
+	if (limit == STOP_TRIES) {
+		printk(KERN_ERR "%s: RX DMA will not disable, resetting whole "
+		       "chip.\n", dev->name);
+		return 1;
+	}
+
+	mdelay(5);
+
+	/* Execute RX reset command. */
+	writel(SW_RESET_RX, cp->regs + REG_SW_RESET);
+	for (limit = 0; limit < STOP_TRIES; limit++) {
+		if (!(readl(cp->regs + REG_SW_RESET) & SW_RESET_RX))
+			break;
+		udelay(10);
+	}
+	if (limit == STOP_TRIES) {
+		printk(KERN_ERR "%s: RX reset command will not execute, "
+		       "resetting whole chip.\n", dev->name);
+		return 1;
+	}
+
+	/* reset driver rx state */
+	cas_clean_rxds(cp);
+	cas_clean_rxcs(cp);
+
+	/* Now, reprogram the rest of RX unit. */
+	cas_init_rx_dma(cp);
+
+	/* re-enable */
+	val = readl(cp->regs + REG_RX_CFG);
+	writel(val | RX_CFG_DMA_EN, cp->regs + REG_RX_CFG);
+	writel(MAC_RX_FRAME_RECV, cp->regs + REG_MAC_RX_MASK);
+	val = readl(cp->regs + REG_MAC_RX_CFG);
+	writel(val | MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
+	return 0;
+}
+#endif
+
+static int cas_rxmac_interrupt(struct net_device *dev, struct cas *cp,
+			       u32 status)
+{
+	u32 stat = readl(cp->regs + REG_MAC_RX_STATUS);
+
+	if (!stat)
+		return 0;
+
+	if (netif_msg_intr(cp))
+		printk(KERN_DEBUG "%s: rxmac interrupt, stat: 0x%x\n",
+			cp->dev->name, stat);
+
+	/* these are all rollovers */
+	spin_lock(&cp->stat_lock[0]);
+	if (stat & MAC_RX_ALIGN_ERR) 
+		cp->net_stats[0].rx_frame_errors += 0x10000;
+
+	if (stat & MAC_RX_CRC_ERR)
+		cp->net_stats[0].rx_crc_errors += 0x10000;
+
+	if (stat & MAC_RX_LEN_ERR)
+		cp->net_stats[0].rx_length_errors += 0x10000;
+
+	if (stat & MAC_RX_OVERFLOW) {
+		cp->net_stats[0].rx_over_errors++;
+		cp->net_stats[0].rx_fifo_errors++;
+	}
+
+	/* We do not track MAC_RX_FRAME_COUNT and MAC_RX_VIOL_ERR
+	 * events.
+	 */
+	spin_unlock(&cp->stat_lock[0]);
+	return 0;
+}
+
+static int cas_mac_interrupt(struct net_device *dev, struct cas *cp,
+			     u32 status)
+{
+	u32 stat = readl(cp->regs + REG_MAC_CTRL_STATUS);
+
+	if (!stat)
+		return 0;
+
+	if (netif_msg_intr(cp))
+		printk(KERN_DEBUG "%s: mac interrupt, stat: 0x%x\n",
+			cp->dev->name, stat);
+
+	/* This interrupt is just for pause frame and pause
+	 * tracking.  It is useful for diagnostics and debug
+	 * but probably by default we will mask these events.
+	 */
+	if (stat & MAC_CTRL_PAUSE_STATE)
+		cp->pause_entered++;
+
+	if (stat & MAC_CTRL_PAUSE_RECEIVED)
+		cp->pause_last_time_recvd = (stat >> 16);
+
+	return 0;
+}
+
+	
+/* Must be invoked under cp->lock. */
+static inline int cas_mdio_link_not_up(struct cas *cp)
+{
+	u16 val;
+	
+	switch (cp->lstate) {
+	case link_force_ret:
+		if (netif_msg_link(cp))
+			printk(KERN_INFO "%s: Autoneg failed again, keeping"
+				" forced mode\n", cp->dev->name);
+		cas_phy_write(cp, MII_BMCR, cp->link_fcntl);
+		cp->timer_ticks = 5;
+		cp->lstate = link_force_ok;
+		cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
+		break;
+		
+	case link_aneg:
+		val = cas_phy_read(cp, MII_BMCR);
+
+		/* Try forced modes. we try things in the following order:
+		 * 1000 full -> 100 full/half -> 10 half
+		 */
+		val &= ~(BMCR_ANRESTART | BMCR_ANENABLE);
+		val |= BMCR_FULLDPLX;
+		val |= (cp->cas_flags & CAS_FLAG_1000MB_CAP) ? 
+			CAS_BMCR_SPEED1000 : BMCR_SPEED100;
+		cas_phy_write(cp, MII_BMCR, val);
+		cp->timer_ticks = 5;
+		cp->lstate = link_force_try;
+		cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
+		break;
+
+	case link_force_try:
+		/* Downgrade from 1000 to 100 to 10 Mbps if necessary. */
+		val = cas_phy_read(cp, MII_BMCR);
+		cp->timer_ticks = 5;
+		if (val & CAS_BMCR_SPEED1000) { /* gigabit */
+			val &= ~CAS_BMCR_SPEED1000;
+			val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
+			cas_phy_write(cp, MII_BMCR, val);
+			break;
+		}
+
+		if (val & BMCR_SPEED100) {
+			if (val & BMCR_FULLDPLX) /* fd failed */
+				val &= ~BMCR_FULLDPLX;
+			else { /* 100Mbps failed */
+				val &= ~BMCR_SPEED100;
+			}
+			cas_phy_write(cp, MII_BMCR, val);
+			break;
+		}
+	default:
+		break;
+	}
+	return 0;
+}
+
+
+/* must be invoked with cp->lock held */
+static int cas_mii_link_check(struct cas *cp, const u16 bmsr)
+{
+	int restart;
+
+	if (bmsr & BMSR_LSTATUS) {
+		/* Ok, here we got a link. If we had it due to a forced
+		 * fallback, and we were configured for autoneg, we 
+		 * retry a short autoneg pass. If you know your hub is
+		 * broken, use ethtool ;)
+		 */
+		if ((cp->lstate == link_force_try) && 
+		    (cp->link_cntl & BMCR_ANENABLE)) {
+			cp->lstate = link_force_ret;
+			cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
+			cas_mif_poll(cp, 0);
+			cp->link_fcntl = cas_phy_read(cp, MII_BMCR);
+			cp->timer_ticks = 5;
+			if (cp->opened && netif_msg_link(cp))
+				printk(KERN_INFO "%s: Got link after fallback, retrying"
+				       " autoneg once...\n", cp->dev->name);
+			cas_phy_write(cp, MII_BMCR,
+				      cp->link_fcntl | BMCR_ANENABLE |
+				      BMCR_ANRESTART);
+			cas_mif_poll(cp, 1);
+
+		} else if (cp->lstate != link_up) {
+			cp->lstate = link_up;
+			cp->link_transition = LINK_TRANSITION_LINK_UP;
+
+			if (cp->opened) {
+				cas_set_link_modes(cp);
+				netif_carrier_on(cp->dev);
+			}
+		}
+		return 0;
+	}
+
+	/* link not up. if the link was previously up, we restart the
+	 * whole process
+	 */
+	restart = 0;
+	if (cp->lstate == link_up) {
+		cp->lstate = link_down;
+		cp->link_transition = LINK_TRANSITION_LINK_DOWN;
+
+		netif_carrier_off(cp->dev);
+		if (cp->opened && netif_msg_link(cp))
+			printk(KERN_INFO "%s: Link down\n",
+			       cp->dev->name);
+		restart = 1;
+		
+	} else if (++cp->timer_ticks > 10)
+		cas_mdio_link_not_up(cp);
+		
+	return restart;
+}
+
+static int cas_mif_interrupt(struct net_device *dev, struct cas *cp,
+			     u32 status)
+{
+	u32 stat = readl(cp->regs + REG_MIF_STATUS);
+	u16 bmsr;
+
+	/* check for a link change */
+	if (CAS_VAL(MIF_STATUS_POLL_STATUS, stat) == 0)
+		return 0;
+
+	bmsr = CAS_VAL(MIF_STATUS_POLL_DATA, stat);
+	return cas_mii_link_check(cp, bmsr);
+}
+
+static int cas_pci_interrupt(struct net_device *dev, struct cas *cp,
+			     u32 status)
+{
+	u32 stat = readl(cp->regs + REG_PCI_ERR_STATUS);
+
+	if (!stat)
+		return 0;
+
+	printk(KERN_ERR "%s: PCI error [%04x:%04x] ", dev->name, stat,
+	       readl(cp->regs + REG_BIM_DIAG));
+
+	/* cassini+ has this reserved */
+	if ((stat & PCI_ERR_BADACK) &&
+	    ((cp->cas_flags & CAS_FLAG_REG_PLUS) == 0))
+		printk("<No ACK64# during ABS64 cycle> ");
+
+	if (stat & PCI_ERR_DTRTO)
+		printk("<Delayed transaction timeout> ");
+	if (stat & PCI_ERR_OTHER)
+		printk("<other> ");
+	if (stat & PCI_ERR_BIM_DMA_WRITE)
+		printk("<BIM DMA 0 write req> ");
+	if (stat & PCI_ERR_BIM_DMA_READ)
+		printk("<BIM DMA 0 read req> ");
+	printk("\n");
+
+	if (stat & PCI_ERR_OTHER) {
+		u16 cfg;
+
+		/* Interrogate PCI config space for the
+		 * true cause.
+		 */
+		pci_read_config_word(cp->pdev, PCI_STATUS, &cfg);
+		printk(KERN_ERR "%s: Read PCI cfg space status [%04x]\n",
+		       dev->name, cfg);
+		if (cfg & PCI_STATUS_PARITY)
+			printk(KERN_ERR "%s: PCI parity error detected.\n",
+			       dev->name);
+		if (cfg & PCI_STATUS_SIG_TARGET_ABORT)
+			printk(KERN_ERR "%s: PCI target abort.\n",
+			       dev->name);
+		if (cfg & PCI_STATUS_REC_TARGET_ABORT)
+			printk(KERN_ERR "%s: PCI master acks target abort.\n",
+			       dev->name);
+		if (cfg & PCI_STATUS_REC_MASTER_ABORT)
+			printk(KERN_ERR "%s: PCI master abort.\n", dev->name);
+		if (cfg & PCI_STATUS_SIG_SYSTEM_ERROR)
+			printk(KERN_ERR "%s: PCI system error SERR#.\n",
+			       dev->name);
+		if (cfg & PCI_STATUS_DETECTED_PARITY)
+			printk(KERN_ERR "%s: PCI parity error.\n",
+			       dev->name);
+
+		/* Write the error bits back to clear them. */
+		cfg &= (PCI_STATUS_PARITY |
+			PCI_STATUS_SIG_TARGET_ABORT |
+			PCI_STATUS_REC_TARGET_ABORT |
+			PCI_STATUS_REC_MASTER_ABORT |
+			PCI_STATUS_SIG_SYSTEM_ERROR |
+			PCI_STATUS_DETECTED_PARITY);
+		pci_write_config_word(cp->pdev, PCI_STATUS, cfg);
+	}
+
+	/* For all PCI errors, we should reset the chip. */
+	return 1;
+}
+
+/* All non-normal interrupt conditions get serviced here.
+ * Returns non-zero if we should just exit the interrupt
+ * handler right now (ie. if we reset the card which invalidates
+ * all of the other original irq status bits).
+ */
+static int cas_abnormal_irq(struct net_device *dev, struct cas *cp,
+			    u32 status)
+{
+	if (status & INTR_RX_TAG_ERROR) {
+		/* corrupt RX tag framing */
+		if (netif_msg_rx_err(cp))
+			printk(KERN_DEBUG "%s: corrupt rx tag framing\n",
+				cp->dev->name);
+		spin_lock(&cp->stat_lock[0]);
+		cp->net_stats[0].rx_errors++;
+		spin_unlock(&cp->stat_lock[0]);
+		goto do_reset;
+	}
+
+	if (status & INTR_RX_LEN_MISMATCH) {
+		/* length mismatch. */
+		if (netif_msg_rx_err(cp))
+			printk(KERN_DEBUG "%s: length mismatch for rx frame\n",
+				cp->dev->name);
+		spin_lock(&cp->stat_lock[0]);
+		cp->net_stats[0].rx_errors++;
+		spin_unlock(&cp->stat_lock[0]);
+		goto do_reset;
+	}
+
+	if (status & INTR_PCS_STATUS) {
+		if (cas_pcs_interrupt(dev, cp, status))
+			goto do_reset;
+	}
+
+	if (status & INTR_TX_MAC_STATUS) {
+		if (cas_txmac_interrupt(dev, cp, status))
+			goto do_reset;
+	}
+
+	if (status & INTR_RX_MAC_STATUS) {
+		if (cas_rxmac_interrupt(dev, cp, status))
+			goto do_reset;
+	}
+
+	if (status & INTR_MAC_CTRL_STATUS) {
+		if (cas_mac_interrupt(dev, cp, status))
+			goto do_reset;
+	}
+
+	if (status & INTR_MIF_STATUS) {
+		if (cas_mif_interrupt(dev, cp, status))
+			goto do_reset;
+	}
+
+	if (status & INTR_PCI_ERROR_STATUS) {
+		if (cas_pci_interrupt(dev, cp, status))
+			goto do_reset;
+	}
+	return 0;
+
+do_reset:
+#if 1
+	atomic_inc(&cp->reset_task_pending);
+	atomic_inc(&cp->reset_task_pending_all);
+	printk(KERN_ERR "%s:reset called in cas_abnormal_irq [0x%x]\n",
+	       dev->name, status);
+	schedule_work(&cp->reset_task);
+#else
+	atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
+	printk(KERN_ERR "reset called in cas_abnormal_irq\n");
+	schedule_work(&cp->reset_task);
+#endif
+	return 1;
+}
+
+/* NOTE: CAS_TABORT returns 1 or 2 so that it can be used when
+ *       determining whether to do a netif_stop/wakeup
+ */
+#define CAS_TABORT(x)      (((x)->cas_flags & CAS_FLAG_TARGET_ABORT) ? 2 : 1)
+#define CAS_ROUND_PAGE(x)  (((x) + PAGE_SIZE - 1) & PAGE_MASK)
+static inline int cas_calc_tabort(struct cas *cp, const unsigned long addr,
+				  const int len)
+{
+	unsigned long off = addr + len;
+
+	if (CAS_TABORT(cp) == 1)
+		return 0;
+	if ((CAS_ROUND_PAGE(off) - off) > TX_TARGET_ABORT_LEN)
+		return 0;
+	return TX_TARGET_ABORT_LEN;
+}
+
+static inline void cas_tx_ringN(struct cas *cp, int ring, int limit)
+{
+	struct cas_tx_desc *txds;
+	struct sk_buff **skbs;
+	struct net_device *dev = cp->dev;
+	int entry, count;
+
+	spin_lock(&cp->tx_lock[ring]);
+	txds = cp->init_txds[ring];
+	skbs = cp->tx_skbs[ring];
+	entry = cp->tx_old[ring];
+
+	count = TX_BUFF_COUNT(ring, entry, limit);
+	while (entry != limit) {
+		struct sk_buff *skb = skbs[entry];
+		dma_addr_t daddr;
+		u32 dlen;
+		int frag;
+
+		if (!skb) {
+			/* this should never occur */
+			entry = TX_DESC_NEXT(ring, entry);
+			continue;
+		}
+
+		/* however, we might get only a partial skb release. */
+		count -= skb_shinfo(skb)->nr_frags +
+			+ cp->tx_tiny_use[ring][entry].nbufs + 1;
+		if (count < 0)
+			break;
+
+		if (netif_msg_tx_done(cp))
+			printk(KERN_DEBUG "%s: tx[%d] done, slot %d\n",
+			       cp->dev->name, ring, entry);
+
+		skbs[entry] = NULL;
+		cp->tx_tiny_use[ring][entry].nbufs = 0;
+		
+		for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) {
+			struct cas_tx_desc *txd = txds + entry;
+
+			daddr = le64_to_cpu(txd->buffer);
+			dlen = CAS_VAL(TX_DESC_BUFLEN,
+				       le64_to_cpu(txd->control));
+			pci_unmap_page(cp->pdev, daddr, dlen,
+				       PCI_DMA_TODEVICE);
+			entry = TX_DESC_NEXT(ring, entry);
+
+			/* tiny buffer may follow */
+			if (cp->tx_tiny_use[ring][entry].used) {
+				cp->tx_tiny_use[ring][entry].used = 0;
+				entry = TX_DESC_NEXT(ring, entry);
+			} 
+		}
+
+		spin_lock(&cp->stat_lock[ring]);
+		cp->net_stats[ring].tx_packets++;
+		cp->net_stats[ring].tx_bytes += skb->len;
+		spin_unlock(&cp->stat_lock[ring]);
+		dev_kfree_skb_irq(skb);
+	}
+	cp->tx_old[ring] = entry;
+
+	/* this is wrong for multiple tx rings. the net device needs
+	 * multiple queues for this to do the right thing.  we wait
+	 * for 2*packets to be available when using tiny buffers
+	 */
+	if (netif_queue_stopped(dev) &&
+	    (TX_BUFFS_AVAIL(cp, ring) > CAS_TABORT(cp)*(MAX_SKB_FRAGS + 1)))
+		netif_wake_queue(dev);
+	spin_unlock(&cp->tx_lock[ring]);
+}
+
+static void cas_tx(struct net_device *dev, struct cas *cp,
+		   u32 status)
+{
+        int limit, ring;
+#ifdef USE_TX_COMPWB
+	u64 compwb = le64_to_cpu(cp->init_block->tx_compwb);
+#endif
+	if (netif_msg_intr(cp))
+		printk(KERN_DEBUG "%s: tx interrupt, status: 0x%x, %lx\n",
+			cp->dev->name, status, compwb);
+	/* process all the rings */
+	for (ring = 0; ring < N_TX_RINGS; ring++) {
+#ifdef USE_TX_COMPWB
+		/* use the completion writeback registers */
+		limit = (CAS_VAL(TX_COMPWB_MSB, compwb) << 8) |
+			CAS_VAL(TX_COMPWB_LSB, compwb);
+		compwb = TX_COMPWB_NEXT(compwb);
+#else
+		limit = readl(cp->regs + REG_TX_COMPN(ring));
+#endif
+		if (cp->tx_old[ring] != limit) 
+			cas_tx_ringN(cp, ring, limit);
+	}
+}
+
+
+static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc, 
+			      int entry, const u64 *words, 
+			      struct sk_buff **skbref)
+{
+	int dlen, hlen, len, i, alloclen;
+	int off, swivel = RX_SWIVEL_OFF_VAL;
+	struct cas_page *page;
+	struct sk_buff *skb;
+	void *addr, *crcaddr;
+	char *p; 
+
+	hlen = CAS_VAL(RX_COMP2_HDR_SIZE, words[1]);
+	dlen = CAS_VAL(RX_COMP1_DATA_SIZE, words[0]);
+	len  = hlen + dlen;
+
+	if (RX_COPY_ALWAYS || (words[2] & RX_COMP3_SMALL_PKT)) 
+		alloclen = len;
+	else 
+		alloclen = max(hlen, RX_COPY_MIN);
+
+	skb = dev_alloc_skb(alloclen + swivel + cp->crc_size);
+	if (skb == NULL) 
+		return -1;
+
+	*skbref = skb;
+	skb->dev = cp->dev;
+	skb_reserve(skb, swivel);
+
+	p = skb->data;
+	addr = crcaddr = NULL;
+	if (hlen) { /* always copy header pages */
+		i = CAS_VAL(RX_COMP2_HDR_INDEX, words[1]);
+		page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
+		off = CAS_VAL(RX_COMP2_HDR_OFF, words[1]) * 0x100 + 
+			swivel;
+
+		i = hlen;
+		if (!dlen) /* attach FCS */
+			i += cp->crc_size;
+		pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
+				    PCI_DMA_FROMDEVICE);
+		addr = cas_page_map(page->buffer);
+		memcpy(p, addr + off, i);
+		pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
+				    PCI_DMA_FROMDEVICE);
+		cas_page_unmap(addr);
+		RX_USED_ADD(page, 0x100);
+		p += hlen;
+		swivel = 0;
+	} 
+
+
+	if (alloclen < (hlen + dlen)) {
+		skb_frag_t *frag = skb_shinfo(skb)->frags;
+
+		/* normal or jumbo packets. we use frags */
+		i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
+		page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
+		off = CAS_VAL(RX_COMP1_DATA_OFF, words[0]) + swivel;
+
+		hlen = min(cp->page_size - off, dlen);
+		if (hlen < 0) {
+			if (netif_msg_rx_err(cp)) {
+				printk(KERN_DEBUG "%s: rx page overflow: "
+				       "%d\n", cp->dev->name, hlen);
+			}
+			dev_kfree_skb_irq(skb);
+			return -1;
+		}
+		i = hlen;
+		if (i == dlen)  /* attach FCS */
+			i += cp->crc_size;
+		pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
+				    PCI_DMA_FROMDEVICE);
+
+		/* make sure we always copy a header */
+		swivel = 0;
+		if (p == (char *) skb->data) { /* not split */
+			addr = cas_page_map(page->buffer);
+			memcpy(p, addr + off, RX_COPY_MIN);
+			pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
+					PCI_DMA_FROMDEVICE);
+			cas_page_unmap(addr);
+			off += RX_COPY_MIN;
+			swivel = RX_COPY_MIN;
+			RX_USED_ADD(page, cp->mtu_stride);
+		} else {
+			RX_USED_ADD(page, hlen);
+		}
+		skb_put(skb, alloclen);
+
+		skb_shinfo(skb)->nr_frags++;
+		skb->data_len += hlen - swivel;
+		skb->len      += hlen - swivel;
+
+		get_page(page->buffer);
+		frag->page = page->buffer;
+		frag->page_offset = off;
+		frag->size = hlen - swivel;
+		
+		/* any more data? */
+		if ((words[0] & RX_COMP1_SPLIT_PKT) && ((dlen -= hlen) > 0)) {
+			hlen = dlen;
+			off = 0;
+
+			i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
+			page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
+			pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr, 
+					    hlen + cp->crc_size, 
+					    PCI_DMA_FROMDEVICE);
+			pci_dma_sync_single_for_device(cp->pdev, page->dma_addr,
+					    hlen + cp->crc_size,
+					    PCI_DMA_FROMDEVICE);
+
+			skb_shinfo(skb)->nr_frags++;
+			skb->data_len += hlen;
+			skb->len      += hlen; 
+			frag++;
+
+			get_page(page->buffer);
+			frag->page = page->buffer;
+			frag->page_offset = 0;
+			frag->size = hlen;
+			RX_USED_ADD(page, hlen + cp->crc_size);
+		}
+
+		if (cp->crc_size) {
+			addr = cas_page_map(page->buffer);
+			crcaddr  = addr + off + hlen;
+		}
+
+	} else {
+		/* copying packet */
+		if (!dlen)
+			goto end_copy_pkt;
+
+		i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
+		page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
+		off = CAS_VAL(RX_COMP1_DATA_OFF, words[0]) + swivel;
+		hlen = min(cp->page_size - off, dlen);
+		if (hlen < 0) {
+			if (netif_msg_rx_err(cp)) {
+				printk(KERN_DEBUG "%s: rx page overflow: "
+				       "%d\n", cp->dev->name, hlen);
+			}
+			dev_kfree_skb_irq(skb);
+			return -1;
+		}
+		i = hlen;
+		if (i == dlen) /* attach FCS */
+			i += cp->crc_size;
+		pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
+				    PCI_DMA_FROMDEVICE);
+		addr = cas_page_map(page->buffer);
+		memcpy(p, addr + off, i);
+		pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
+				    PCI_DMA_FROMDEVICE);
+		cas_page_unmap(addr);
+		if (p == (char *) skb->data) /* not split */
+			RX_USED_ADD(page, cp->mtu_stride);
+		else
+			RX_USED_ADD(page, i);
+	
+		/* any more data? */
+		if ((words[0] & RX_COMP1_SPLIT_PKT) && ((dlen -= hlen) > 0)) {
+			p += hlen;
+			i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
+			page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
+			pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr, 
+					    dlen + cp->crc_size, 
+					    PCI_DMA_FROMDEVICE);
+			addr = cas_page_map(page->buffer);
+			memcpy(p, addr, dlen + cp->crc_size);
+			pci_dma_sync_single_for_device(cp->pdev, page->dma_addr,
+					    dlen + cp->crc_size,
+					    PCI_DMA_FROMDEVICE);
+			cas_page_unmap(addr);
+			RX_USED_ADD(page, dlen + cp->crc_size); 
+		}
+end_copy_pkt:
+		if (cp->crc_size) {
+			addr    = NULL;
+			crcaddr = skb->data + alloclen;
+		}
+		skb_put(skb, alloclen);
+	}
+
+	i = CAS_VAL(RX_COMP4_TCP_CSUM, words[3]);
+	if (cp->crc_size) {
+		/* checksum includes FCS. strip it out. */
+		i = csum_fold(csum_partial(crcaddr, cp->crc_size, i));
+		if (addr)
+			cas_page_unmap(addr);
+	}
+	skb->csum = ntohs(i ^ 0xffff);
+	skb->ip_summed = CHECKSUM_HW;
+	skb->protocol = eth_type_trans(skb, cp->dev);
+	return len;
+}
+
+
+/* we can handle up to 64 rx flows at a time. we do the same thing
+ * as nonreassm except that we batch up the buffers. 
+ * NOTE: we currently just treat each flow as a bunch of packets that
+ *       we pass up. a better way would be to coalesce the packets
+ *       into a jumbo packet. to do that, we need to do the following:
+ *       1) the first packet will have a clean split between header and
+ *          data. save both.
+ *       2) each time the next flow packet comes in, extend the
+ *          data length and merge the checksums.
+ *       3) on flow release, fix up the header.
+ *       4) make sure the higher layer doesn't care.
+ * because packets get coalesced, we shouldn't run into fragment count 
+ * issues.
+ */
+static inline void cas_rx_flow_pkt(struct cas *cp, const u64 *words,
+				   struct sk_buff *skb)
+{
+	int flowid = CAS_VAL(RX_COMP3_FLOWID, words[2]) & (N_RX_FLOWS - 1);
+	struct sk_buff_head *flow = &cp->rx_flows[flowid];
+	
+	/* this is protected at a higher layer, so no need to 
+	 * do any additional locking here. stick the buffer
+	 * at the end.
+	 */
+	__skb_insert(skb, flow->prev, (struct sk_buff *) flow, flow);
+	if (words[0] & RX_COMP1_RELEASE_FLOW) {
+		while ((skb = __skb_dequeue(flow))) {
+			cas_skb_release(skb);
+		}
+	}
+}
+
+/* put rx descriptor back on ring. if a buffer is in use by a higher
+ * layer, this will need to put in a replacement.
+ */
+static void cas_post_page(struct cas *cp, const int ring, const int index)
+{
+	cas_page_t *new;
+	int entry;
+
+	entry = cp->rx_old[ring];
+
+	new = cas_page_swap(cp, ring, index);
+	cp->init_rxds[ring][entry].buffer = cpu_to_le64(new->dma_addr);
+	cp->init_rxds[ring][entry].index  =
+		cpu_to_le64(CAS_BASE(RX_INDEX_NUM, index) | 
+			    CAS_BASE(RX_INDEX_RING, ring));
+
+	entry = RX_DESC_ENTRY(ring, entry + 1);
+	cp->rx_old[ring] = entry;
+	
+	if (entry % 4)
+		return;
+
+	if (ring == 0)
+		writel(entry, cp->regs + REG_RX_KICK);
+	else if ((N_RX_DESC_RINGS > 1) &&
+		 (cp->cas_flags & CAS_FLAG_REG_PLUS)) 
+		writel(entry, cp->regs + REG_PLUS_RX_KICK1);
+}
+
+
+/* only when things are bad */
+static int cas_post_rxds_ringN(struct cas *cp, int ring, int num)
+{
+	unsigned int entry, last, count, released;
+	int cluster;
+	cas_page_t **page = cp->rx_pages[ring];
+
+	entry = cp->rx_old[ring];
+
+	if (netif_msg_intr(cp))
+		printk(KERN_DEBUG "%s: rxd[%d] interrupt, done: %d\n",
+		       cp->dev->name, ring, entry);
+
+	cluster = -1;
+	count = entry & 0x3; 
+	last = RX_DESC_ENTRY(ring, num ? entry + num - 4: entry - 4);
+	released = 0;
+	while (entry != last) {
+		/* make a new buffer if it's still in use */
+		if (page_count(page[entry]->buffer) > 1) {
+			cas_page_t *new = cas_page_dequeue(cp);
+			if (!new) {
+				/* let the timer know that we need to 
+				 * do this again
+				 */
+				cp->cas_flags |= CAS_FLAG_RXD_POST(ring);
+				if (!timer_pending(&cp->link_timer))
+					mod_timer(&cp->link_timer, jiffies + 
+						  CAS_LINK_FAST_TIMEOUT);
+				cp->rx_old[ring]  = entry;
+				cp->rx_last[ring] = num ? num - released : 0;
+				return -ENOMEM;
+			}
+			spin_lock(&cp->rx_inuse_lock);
+			list_add(&page[entry]->list, &cp->rx_inuse_list);
+			spin_unlock(&cp->rx_inuse_lock);
+			cp->init_rxds[ring][entry].buffer = 
+				cpu_to_le64(new->dma_addr);
+			page[entry] = new;
+			
+		}
+
+		if (++count == 4) {
+			cluster = entry;
+			count = 0;
+		}
+		released++;
+		entry = RX_DESC_ENTRY(ring, entry + 1);
+	}
+	cp->rx_old[ring] = entry;
+
+	if (cluster < 0) 
+		return 0;
+
+	if (ring == 0)
+		writel(cluster, cp->regs + REG_RX_KICK);
+	else if ((N_RX_DESC_RINGS > 1) &&
+		 (cp->cas_flags & CAS_FLAG_REG_PLUS)) 
+		writel(cluster, cp->regs + REG_PLUS_RX_KICK1);
+	return 0;
+}
+
+
+/* process a completion ring. packets are set up in three basic ways:
+ * small packets: should be copied header + data in single buffer.
+ * large packets: header and data in a single buffer.
+ * split packets: header in a separate buffer from data. 
+ *                data may be in multiple pages. data may be > 256
+ *                bytes but in a single page. 
+ *
+ * NOTE: RX page posting is done in this routine as well. while there's
+ *       the capability of using multiple RX completion rings, it isn't
+ *       really worthwhile due to the fact that the page posting will
+ *       force serialization on the single descriptor ring. 
+ */
+static int cas_rx_ringN(struct cas *cp, int ring, int budget)
+{
+	struct cas_rx_comp *rxcs = cp->init_rxcs[ring];
+	int entry, drops;
+	int npackets = 0;
+
+	if (netif_msg_intr(cp))
+		printk(KERN_DEBUG "%s: rx[%d] interrupt, done: %d/%d\n",
+		       cp->dev->name, ring,
+		       readl(cp->regs + REG_RX_COMP_HEAD), 
+		       cp->rx_new[ring]);
+
+	entry = cp->rx_new[ring];
+	drops = 0;
+	while (1) {
+		struct cas_rx_comp *rxc = rxcs + entry;
+		struct sk_buff *skb;
+		int type, len;
+		u64 words[4];
+		int i, dring;
+
+		words[0] = le64_to_cpu(rxc->word1);
+		words[1] = le64_to_cpu(rxc->word2);
+		words[2] = le64_to_cpu(rxc->word3);
+		words[3] = le64_to_cpu(rxc->word4);
+
+		/* don't touch if still owned by hw */
+		type = CAS_VAL(RX_COMP1_TYPE, words[0]);
+		if (type == 0)
+			break;
+
+		/* hw hasn't cleared the zero bit yet */
+		if (words[3] & RX_COMP4_ZERO) {
+			break;
+		}
+
+		/* get info on the packet */
+		if (words[3] & (RX_COMP4_LEN_MISMATCH | RX_COMP4_BAD)) {
+			spin_lock(&cp->stat_lock[ring]);
+			cp->net_stats[ring].rx_errors++;
+			if (words[3] & RX_COMP4_LEN_MISMATCH)
+				cp->net_stats[ring].rx_length_errors++;
+			if (words[3] & RX_COMP4_BAD)
+				cp->net_stats[ring].rx_crc_errors++;
+			spin_unlock(&cp->stat_lock[ring]);
+
+			/* We'll just return it to Cassini. */
+		drop_it:
+			spin_lock(&cp->stat_lock[ring]);
+			++cp->net_stats[ring].rx_dropped;
+			spin_unlock(&cp->stat_lock[ring]);
+			goto next;
+		}
+
+		len = cas_rx_process_pkt(cp, rxc, entry, words, &skb);
+		if (len < 0) {
+			++drops;
+			goto drop_it;
+		}
+
+		/* see if it's a flow re-assembly or not. the driver
+		 * itself handles release back up.
+		 */
+		if (RX_DONT_BATCH || (type == 0x2)) {
+			/* non-reassm: these always get released */
+			cas_skb_release(skb); 
+		} else {
+			cas_rx_flow_pkt(cp, words, skb);
+		}
+
+		spin_lock(&cp->stat_lock[ring]);
+		cp->net_stats[ring].rx_packets++;
+		cp->net_stats[ring].rx_bytes += len;
+		spin_unlock(&cp->stat_lock[ring]);
+		cp->dev->last_rx = jiffies;
+
+	next:
+		npackets++;
+
+		/* should it be released? */
+		if (words[0] & RX_COMP1_RELEASE_HDR) {
+			i = CAS_VAL(RX_COMP2_HDR_INDEX, words[1]);
+			dring = CAS_VAL(RX_INDEX_RING, i);
+			i = CAS_VAL(RX_INDEX_NUM, i);
+			cas_post_page(cp, dring, i);
+		}
+		
+		if (words[0] & RX_COMP1_RELEASE_DATA) {
+			i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
+			dring = CAS_VAL(RX_INDEX_RING, i);
+			i = CAS_VAL(RX_INDEX_NUM, i);
+			cas_post_page(cp, dring, i);
+		}
+
+		if (words[0] & RX_COMP1_RELEASE_NEXT) {
+			i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
+			dring = CAS_VAL(RX_INDEX_RING, i);
+			i = CAS_VAL(RX_INDEX_NUM, i);
+			cas_post_page(cp, dring, i);
+		}
+
+		/* skip to the next entry */
+		entry = RX_COMP_ENTRY(ring, entry + 1 + 
+				      CAS_VAL(RX_COMP1_SKIP, words[0]));
+#ifdef USE_NAPI
+		if (budget && (npackets >= budget))
+			break;
+#endif
+	}
+	cp->rx_new[ring] = entry;
+
+	if (drops)
+		printk(KERN_INFO "%s: Memory squeeze, deferring packet.\n",
+		       cp->dev->name);
+	return npackets;
+}
+
+
+/* put completion entries back on the ring */
+static void cas_post_rxcs_ringN(struct net_device *dev,
+				struct cas *cp, int ring)
+{
+	struct cas_rx_comp *rxc = cp->init_rxcs[ring];
+	int last, entry;
+
+	last = cp->rx_cur[ring];
+	entry = cp->rx_new[ring]; 
+	if (netif_msg_intr(cp))
+		printk(KERN_DEBUG "%s: rxc[%d] interrupt, done: %d/%d\n",
+		       dev->name, ring, readl(cp->regs + REG_RX_COMP_HEAD),
+		       entry);
+	
+	/* zero and re-mark descriptors */
+	while (last != entry) {
+		cas_rxc_init(rxc + last);
+		last = RX_COMP_ENTRY(ring, last + 1);
+	}
+	cp->rx_cur[ring] = last;
+
+	if (ring == 0)
+		writel(last, cp->regs + REG_RX_COMP_TAIL);
+	else if (cp->cas_flags & CAS_FLAG_REG_PLUS) 
+		writel(last, cp->regs + REG_PLUS_RX_COMPN_TAIL(ring));
+}
+
+
+
+/* cassini can use all four PCI interrupts for the completion ring. 
+ * rings 3 and 4 are identical
+ */
+#if defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
+static inline void cas_handle_irqN(struct net_device *dev, 
+				   struct cas *cp, const u32 status,
+				   const int ring)
+{
+	if (status & (INTR_RX_COMP_FULL_ALT | INTR_RX_COMP_AF_ALT)) 
+		cas_post_rxcs_ringN(dev, cp, ring);
+}
+
+static irqreturn_t cas_interruptN(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct cas *cp = netdev_priv(dev);
+	unsigned long flags;
+	int ring;
+	u32 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(ring));
+
+	/* check for shared irq */
+	if (status == 0)
+		return IRQ_NONE;
+
+	ring = (irq == cp->pci_irq_INTC) ? 2 : 3;
+	spin_lock_irqsave(&cp->lock, flags);
+	if (status & INTR_RX_DONE_ALT) { /* handle rx separately */
+#ifdef USE_NAPI
+		cas_mask_intr(cp);
+		netif_rx_schedule(dev);
+#else
+		cas_rx_ringN(cp, ring, 0);
+#endif
+		status &= ~INTR_RX_DONE_ALT;
+	}
+
+	if (status)
+		cas_handle_irqN(dev, cp, status, ring);
+	spin_unlock_irqrestore(&cp->lock, flags);
+	return IRQ_HANDLED;
+}
+#endif
+
+#ifdef USE_PCI_INTB
+/* everything but rx packets */
+static inline void cas_handle_irq1(struct cas *cp, const u32 status)
+{
+	if (status & INTR_RX_BUF_UNAVAIL_1) {
+		/* Frame arrived, no free RX buffers available. 
+		 * NOTE: we can get this on a link transition. */
+		cas_post_rxds_ringN(cp, 1, 0);
+		spin_lock(&cp->stat_lock[1]);
+		cp->net_stats[1].rx_dropped++;
+		spin_unlock(&cp->stat_lock[1]);
+	}
+
+	if (status & INTR_RX_BUF_AE_1) 
+		cas_post_rxds_ringN(cp, 1, RX_DESC_RINGN_SIZE(1) - 
+				    RX_AE_FREEN_VAL(1));
+
+	if (status & (INTR_RX_COMP_AF | INTR_RX_COMP_FULL))
+		cas_post_rxcs_ringN(cp, 1);
+}
+
+/* ring 2 handles a few more events than 3 and 4 */
+static irqreturn_t cas_interrupt1(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct cas *cp = netdev_priv(dev);
+	unsigned long flags;
+	u32 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(1));
+
+	/* check for shared interrupt */
+	if (status == 0)
+		return IRQ_NONE;
+
+	spin_lock_irqsave(&cp->lock, flags);
+	if (status & INTR_RX_DONE_ALT) { /* handle rx separately */
+#ifdef USE_NAPI
+		cas_mask_intr(cp);
+		netif_rx_schedule(dev);
+#else
+		cas_rx_ringN(cp, 1, 0);
+#endif
+		status &= ~INTR_RX_DONE_ALT;
+	}
+	if (status)
+		cas_handle_irq1(cp, status);
+	spin_unlock_irqrestore(&cp->lock, flags);
+	return IRQ_HANDLED;
+}
+#endif
+
+static inline void cas_handle_irq(struct net_device *dev,
+				  struct cas *cp, const u32 status)
+{
+	/* housekeeping interrupts */
+	if (status & INTR_ERROR_MASK)
+		cas_abnormal_irq(dev, cp, status);
+
+	if (status & INTR_RX_BUF_UNAVAIL) {
+		/* Frame arrived, no free RX buffers available. 
+		 * NOTE: we can get this on a link transition.
+		 */
+		cas_post_rxds_ringN(cp, 0, 0);
+		spin_lock(&cp->stat_lock[0]);
+		cp->net_stats[0].rx_dropped++;
+		spin_unlock(&cp->stat_lock[0]);
+	} else if (status & INTR_RX_BUF_AE) {
+		cas_post_rxds_ringN(cp, 0, RX_DESC_RINGN_SIZE(0) -
+				    RX_AE_FREEN_VAL(0));
+	}
+
+	if (status & (INTR_RX_COMP_AF | INTR_RX_COMP_FULL))
+		cas_post_rxcs_ringN(dev, cp, 0);
+}
+
+static irqreturn_t cas_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct cas *cp = netdev_priv(dev);
+	unsigned long flags;
+	u32 status = readl(cp->regs + REG_INTR_STATUS);
+
+	if (status == 0)
+		return IRQ_NONE;
+
+	spin_lock_irqsave(&cp->lock, flags);
+	if (status & (INTR_TX_ALL | INTR_TX_INTME)) {
+		cas_tx(dev, cp, status);
+		status &= ~(INTR_TX_ALL | INTR_TX_INTME);
+	}
+
+	if (status & INTR_RX_DONE) {
+#ifdef USE_NAPI
+		cas_mask_intr(cp);
+		netif_rx_schedule(dev);
+#else
+		cas_rx_ringN(cp, 0, 0);
+#endif
+		status &= ~INTR_RX_DONE;
+	}
+
+	if (status)
+		cas_handle_irq(dev, cp, status);
+	spin_unlock_irqrestore(&cp->lock, flags);
+	return IRQ_HANDLED;
+}
+
+
+#ifdef USE_NAPI
+static int cas_poll(struct net_device *dev, int *budget)
+{
+	struct cas *cp = netdev_priv(dev);
+	int i, enable_intr, todo, credits;
+	u32 status = readl(cp->regs + REG_INTR_STATUS);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cp->lock, flags);
+	cas_tx(dev, cp, status);
+	spin_unlock_irqrestore(&cp->lock, flags);
+
+	/* NAPI rx packets. we spread the credits across all of the
+	 * rxc rings
+	 */
+	todo = min(*budget, dev->quota);
+
+	/* to make sure we're fair with the work we loop through each
+	 * ring N_RX_COMP_RING times with a request of 
+	 * todo / N_RX_COMP_RINGS
+	 */
+	enable_intr = 1;
+	credits = 0;
+	for (i = 0; i < N_RX_COMP_RINGS; i++) {
+		int j;
+		for (j = 0; j < N_RX_COMP_RINGS; j++) {
+			credits += cas_rx_ringN(cp, j, todo / N_RX_COMP_RINGS);
+			if (credits >= todo) {
+				enable_intr = 0;
+				goto rx_comp;
+			}
+		}
+	}
+
+rx_comp:
+	*budget    -= credits;
+	dev->quota -= credits;
+
+	/* final rx completion */
+	spin_lock_irqsave(&cp->lock, flags);
+	if (status)
+		cas_handle_irq(dev, cp, status);
+
+#ifdef USE_PCI_INTB
+	if (N_RX_COMP_RINGS > 1) {
+		status = readl(cp->regs + REG_PLUS_INTRN_STATUS(1));
+		if (status)
+			cas_handle_irq1(dev, cp, status);
+	}
+#endif
+
+#ifdef USE_PCI_INTC
+	if (N_RX_COMP_RINGS > 2) {
+		status = readl(cp->regs + REG_PLUS_INTRN_STATUS(2));
+		if (status)
+			cas_handle_irqN(dev, cp, status, 2);
+	}
+#endif
+
+#ifdef USE_PCI_INTD
+	if (N_RX_COMP_RINGS > 3) {
+		status = readl(cp->regs + REG_PLUS_INTRN_STATUS(3));
+		if (status)
+			cas_handle_irqN(dev, cp, status, 3);
+	}
+#endif
+	spin_unlock_irqrestore(&cp->lock, flags);
+	if (enable_intr) {
+		netif_rx_complete(dev);
+		cas_unmask_intr(cp);
+		return 0;
+	}
+	return 1;
+}
+#endif
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void cas_netpoll(struct net_device *dev)
+{
+	struct cas *cp = netdev_priv(dev);
+
+	cas_disable_irq(cp, 0);
+	cas_interrupt(cp->pdev->irq, dev, NULL);
+	cas_enable_irq(cp, 0);
+
+#ifdef USE_PCI_INTB
+	if (N_RX_COMP_RINGS > 1) {
+		/* cas_interrupt1(); */
+	}
+#endif
+#ifdef USE_PCI_INTC
+	if (N_RX_COMP_RINGS > 2) {
+		/* cas_interruptN(); */
+	}
+#endif
+#ifdef USE_PCI_INTD
+	if (N_RX_COMP_RINGS > 3) {
+		/* cas_interruptN(); */
+	}
+#endif
+}
+#endif
+
+static void cas_tx_timeout(struct net_device *dev)
+{
+	struct cas *cp = netdev_priv(dev);
+
+	printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
+	if (!cp->hw_running) {
+		printk("%s: hrm.. hw not running!\n", dev->name);
+		return;
+	}
+
+	printk(KERN_ERR "%s: MIF_STATE[%08x]\n",
+	       dev->name, readl(cp->regs + REG_MIF_STATE_MACHINE));
+
+	printk(KERN_ERR "%s: MAC_STATE[%08x]\n",
+	       dev->name, readl(cp->regs + REG_MAC_STATE_MACHINE));
+
+	printk(KERN_ERR "%s: TX_STATE[%08x:%08x:%08x] "
+	       "FIFO[%08x:%08x:%08x] SM1[%08x] SM2[%08x]\n",
+	       dev->name,
+	       readl(cp->regs + REG_TX_CFG),
+	       readl(cp->regs + REG_MAC_TX_STATUS),
+	       readl(cp->regs + REG_MAC_TX_CFG),
+	       readl(cp->regs + REG_TX_FIFO_PKT_CNT),
+	       readl(cp->regs + REG_TX_FIFO_WRITE_PTR),
+	       readl(cp->regs + REG_TX_FIFO_READ_PTR),
+	       readl(cp->regs + REG_TX_SM_1),
+	       readl(cp->regs + REG_TX_SM_2));
+
+	printk(KERN_ERR "%s: RX_STATE[%08x:%08x:%08x]\n",
+	       dev->name,
+	       readl(cp->regs + REG_RX_CFG),
+	       readl(cp->regs + REG_MAC_RX_STATUS),
+	       readl(cp->regs + REG_MAC_RX_CFG));
+
+	printk(KERN_ERR "%s: HP_STATE[%08x:%08x:%08x:%08x]\n",
+	       dev->name,
+	       readl(cp->regs + REG_HP_STATE_MACHINE),
+	       readl(cp->regs + REG_HP_STATUS0),
+	       readl(cp->regs + REG_HP_STATUS1),
+	       readl(cp->regs + REG_HP_STATUS2));
+
+#if 1
+	atomic_inc(&cp->reset_task_pending);
+	atomic_inc(&cp->reset_task_pending_all);
+	schedule_work(&cp->reset_task);
+#else
+	atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
+	schedule_work(&cp->reset_task);
+#endif
+}
+
+static inline int cas_intme(int ring, int entry)
+{
+	/* Algorithm: IRQ every 1/2 of descriptors. */
+	if (!(entry & ((TX_DESC_RINGN_SIZE(ring) >> 1) - 1)))
+		return 1;
+	return 0;
+}
+
+
+static void cas_write_txd(struct cas *cp, int ring, int entry,
+			  dma_addr_t mapping, int len, u64 ctrl, int last)
+{
+	struct cas_tx_desc *txd = cp->init_txds[ring] + entry;
+
+	ctrl |= CAS_BASE(TX_DESC_BUFLEN, len);
+	if (cas_intme(ring, entry))
+		ctrl |= TX_DESC_INTME;
+	if (last)
+		ctrl |= TX_DESC_EOF;
+	txd->control = cpu_to_le64(ctrl);
+	txd->buffer = cpu_to_le64(mapping);
+}
+
+static inline void *tx_tiny_buf(struct cas *cp, const int ring, 
+				const int entry)
+{
+	return cp->tx_tiny_bufs[ring] + TX_TINY_BUF_LEN*entry;
+}
+
+static inline dma_addr_t tx_tiny_map(struct cas *cp, const int ring, 
+				     const int entry, const int tentry)
+{
+	cp->tx_tiny_use[ring][tentry].nbufs++;
+	cp->tx_tiny_use[ring][entry].used = 1;
+	return cp->tx_tiny_dvma[ring] + TX_TINY_BUF_LEN*entry;
+}
+
+static inline int cas_xmit_tx_ringN(struct cas *cp, int ring, 
+				    struct sk_buff *skb)
+{
+	struct net_device *dev = cp->dev;
+	int entry, nr_frags, frag, tabort, tentry;
+	dma_addr_t mapping;
+	unsigned long flags;
+	u64 ctrl;
+	u32 len;
+
+	spin_lock_irqsave(&cp->tx_lock[ring], flags);
+
+	/* This is a hard error, log it. */
+	if (TX_BUFFS_AVAIL(cp, ring) <= 
+	    CAS_TABORT(cp)*(skb_shinfo(skb)->nr_frags + 1)) {
+		netif_stop_queue(dev);
+		spin_unlock_irqrestore(&cp->tx_lock[ring], flags);
+		printk(KERN_ERR PFX "%s: BUG! Tx Ring full when "
+		       "queue awake!\n", dev->name);
+		return 1;
+	}
+
+	ctrl = 0;
+	if (skb->ip_summed == CHECKSUM_HW) {
+		u64 csum_start_off, csum_stuff_off;
+
+		csum_start_off = (u64) (skb->h.raw - skb->data);
+		csum_stuff_off = (u64) ((skb->h.raw + skb->csum) - skb->data);
+
+		ctrl =  TX_DESC_CSUM_EN | 
+			CAS_BASE(TX_DESC_CSUM_START, csum_start_off) |
+			CAS_BASE(TX_DESC_CSUM_STUFF, csum_stuff_off);
+	}
+
+	entry = cp->tx_new[ring];
+	cp->tx_skbs[ring][entry] = skb;
+
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	len = skb_headlen(skb);
+	mapping = pci_map_page(cp->pdev, virt_to_page(skb->data),
+			       offset_in_page(skb->data), len,
+			       PCI_DMA_TODEVICE);
+
+	tentry = entry;
+	tabort = cas_calc_tabort(cp, (unsigned long) skb->data, len);
+	if (unlikely(tabort)) {
+		/* NOTE: len is always >  tabort */
+		cas_write_txd(cp, ring, entry, mapping, len - tabort, 
+			      ctrl | TX_DESC_SOF, 0);
+		entry = TX_DESC_NEXT(ring, entry);
+
+		memcpy(tx_tiny_buf(cp, ring, entry), skb->data + 
+		       len - tabort, tabort);
+		mapping = tx_tiny_map(cp, ring, entry, tentry);
+		cas_write_txd(cp, ring, entry, mapping, tabort, ctrl,
+			      (nr_frags == 0));
+	} else {
+		cas_write_txd(cp, ring, entry, mapping, len, ctrl | 
+			      TX_DESC_SOF, (nr_frags == 0));
+	}
+	entry = TX_DESC_NEXT(ring, entry);
+
+	for (frag = 0; frag < nr_frags; frag++) {
+		skb_frag_t *fragp = &skb_shinfo(skb)->frags[frag];
+
+		len = fragp->size;
+		mapping = pci_map_page(cp->pdev, fragp->page,
+				       fragp->page_offset, len,
+				       PCI_DMA_TODEVICE);
+
+		tabort = cas_calc_tabort(cp, fragp->page_offset, len);
+		if (unlikely(tabort)) {
+			void *addr;
+
+			/* NOTE: len is always > tabort */
+			cas_write_txd(cp, ring, entry, mapping, len - tabort,
+				      ctrl, 0);
+			entry = TX_DESC_NEXT(ring, entry);
+			
+			addr = cas_page_map(fragp->page);
+			memcpy(tx_tiny_buf(cp, ring, entry),
+			       addr + fragp->page_offset + len - tabort, 
+			       tabort);
+			cas_page_unmap(addr);
+			mapping = tx_tiny_map(cp, ring, entry, tentry);
+			len     = tabort;
+		}
+
+		cas_write_txd(cp, ring, entry, mapping, len, ctrl,
+			      (frag + 1 == nr_frags));
+		entry = TX_DESC_NEXT(ring, entry);
+	}
+
+	cp->tx_new[ring] = entry;
+	if (TX_BUFFS_AVAIL(cp, ring) <= CAS_TABORT(cp)*(MAX_SKB_FRAGS + 1))
+		netif_stop_queue(dev);
+
+	if (netif_msg_tx_queued(cp))
+		printk(KERN_DEBUG "%s: tx[%d] queued, slot %d, skblen %d, "
+		       "avail %d\n",
+		       dev->name, ring, entry, skb->len, 
+		       TX_BUFFS_AVAIL(cp, ring));
+	writel(entry, cp->regs + REG_TX_KICKN(ring));
+	spin_unlock_irqrestore(&cp->tx_lock[ring], flags);
+	return 0;
+} 
+
+static int cas_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct cas *cp = netdev_priv(dev);
+
+	/* this is only used as a load-balancing hint, so it doesn't
+	 * need to be SMP safe
+	 */
+	static int ring; 
+
+	skb = skb_padto(skb, cp->min_frame_size);
+	if (!skb)
+		return 0;
+
+	/* XXX: we need some higher-level QoS hooks to steer packets to
+	 *      individual queues.
+	 */
+	if (cas_xmit_tx_ringN(cp, ring++ & N_TX_RINGS_MASK, skb))
+		return 1;
+	dev->trans_start = jiffies;
+	return 0;
+}
+
+static void cas_init_tx_dma(struct cas *cp)
+{
+	u64 desc_dma = cp->block_dvma;
+	unsigned long off;
+	u32 val;
+	int i;
+
+	/* set up tx completion writeback registers. must be 8-byte aligned */
+#ifdef USE_TX_COMPWB
+	off = offsetof(struct cas_init_block, tx_compwb);
+	writel((desc_dma + off) >> 32, cp->regs + REG_TX_COMPWB_DB_HI);
+	writel((desc_dma + off) & 0xffffffff, cp->regs + REG_TX_COMPWB_DB_LOW);
+#endif
+
+	/* enable completion writebacks, enable paced mode,
+	 * disable read pipe, and disable pre-interrupt compwbs
+	 */
+	val =   TX_CFG_COMPWB_Q1 | TX_CFG_COMPWB_Q2 | 
+		TX_CFG_COMPWB_Q3 | TX_CFG_COMPWB_Q4 |
+		TX_CFG_DMA_RDPIPE_DIS | TX_CFG_PACED_MODE | 
+		TX_CFG_INTR_COMPWB_DIS;
+
+	/* write out tx ring info and tx desc bases */
+	for (i = 0; i < MAX_TX_RINGS; i++) {
+		off = (unsigned long) cp->init_txds[i] - 
+			(unsigned long) cp->init_block;
+
+		val |= CAS_TX_RINGN_BASE(i);
+		writel((desc_dma + off) >> 32, cp->regs + REG_TX_DBN_HI(i));
+		writel((desc_dma + off) & 0xffffffff, cp->regs +
+		       REG_TX_DBN_LOW(i));
+		/* don't zero out the kick register here as the system
+		 * will wedge
+		 */
+	}
+	writel(val, cp->regs + REG_TX_CFG);
+
+	/* program max burst sizes. these numbers should be different
+	 * if doing QoS.
+	 */
+#ifdef USE_QOS
+	writel(0x800, cp->regs + REG_TX_MAXBURST_0);
+	writel(0x1600, cp->regs + REG_TX_MAXBURST_1);
+	writel(0x2400, cp->regs + REG_TX_MAXBURST_2);
+	writel(0x4800, cp->regs + REG_TX_MAXBURST_3);
+#else
+	writel(0x800, cp->regs + REG_TX_MAXBURST_0);
+	writel(0x800, cp->regs + REG_TX_MAXBURST_1);
+	writel(0x800, cp->regs + REG_TX_MAXBURST_2);
+	writel(0x800, cp->regs + REG_TX_MAXBURST_3);
+#endif
+}
+
+/* Must be invoked under cp->lock. */
+static inline void cas_init_dma(struct cas *cp)
+{
+	cas_init_tx_dma(cp);
+	cas_init_rx_dma(cp);
+}
+
+/* Must be invoked under cp->lock. */
+static u32 cas_setup_multicast(struct cas *cp)
+{
+	u32 rxcfg = 0;
+	int i;
+	
+	if (cp->dev->flags & IFF_PROMISC) {
+		rxcfg |= MAC_RX_CFG_PROMISC_EN;
+
+	} else if (cp->dev->flags & IFF_ALLMULTI) {
+	    	for (i=0; i < 16; i++)
+			writel(0xFFFF, cp->regs + REG_MAC_HASH_TABLEN(i));
+		rxcfg |= MAC_RX_CFG_HASH_FILTER_EN;
+
+	} else {
+		u16 hash_table[16];
+		u32 crc;
+		struct dev_mc_list *dmi = cp->dev->mc_list;
+		int i;
+
+		/* use the alternate mac address registers for the
+		 * first 15 multicast addresses
+		 */
+		for (i = 1; i <= CAS_MC_EXACT_MATCH_SIZE; i++) {
+			if (!dmi) {
+				writel(0x0, cp->regs + REG_MAC_ADDRN(i*3 + 0));
+				writel(0x0, cp->regs + REG_MAC_ADDRN(i*3 + 1));
+				writel(0x0, cp->regs + REG_MAC_ADDRN(i*3 + 2));
+				continue;
+			}
+			writel((dmi->dmi_addr[4] << 8) | dmi->dmi_addr[5], 
+			       cp->regs + REG_MAC_ADDRN(i*3 + 0));
+			writel((dmi->dmi_addr[2] << 8) | dmi->dmi_addr[3], 
+			       cp->regs + REG_MAC_ADDRN(i*3 + 1));
+			writel((dmi->dmi_addr[0] << 8) | dmi->dmi_addr[1], 
+			       cp->regs + REG_MAC_ADDRN(i*3 + 2));
+			dmi = dmi->next;
+		}
+
+		/* use hw hash table for the next series of 
+		 * multicast addresses
+		 */
+		memset(hash_table, 0, sizeof(hash_table));
+		while (dmi) {
+ 			crc = ether_crc_le(ETH_ALEN, dmi->dmi_addr);
+			crc >>= 24;
+			hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
+			dmi = dmi->next;
+		}
+	    	for (i=0; i < 16; i++)
+			writel(hash_table[i], cp->regs + 
+			       REG_MAC_HASH_TABLEN(i));
+		rxcfg |= MAC_RX_CFG_HASH_FILTER_EN;
+	}
+
+	return rxcfg;
+}
+
+/* must be invoked under cp->stat_lock[N_TX_RINGS] */
+static void cas_clear_mac_err(struct cas *cp)
+{
+	writel(0, cp->regs + REG_MAC_COLL_NORMAL);
+	writel(0, cp->regs + REG_MAC_COLL_FIRST);
+	writel(0, cp->regs + REG_MAC_COLL_EXCESS);
+	writel(0, cp->regs + REG_MAC_COLL_LATE);
+	writel(0, cp->regs + REG_MAC_TIMER_DEFER);
+	writel(0, cp->regs + REG_MAC_ATTEMPTS_PEAK);
+	writel(0, cp->regs + REG_MAC_RECV_FRAME);
+	writel(0, cp->regs + REG_MAC_LEN_ERR);
+	writel(0, cp->regs + REG_MAC_ALIGN_ERR);
+	writel(0, cp->regs + REG_MAC_FCS_ERR);
+	writel(0, cp->regs + REG_MAC_RX_CODE_ERR);
+}
+
+
+static void cas_mac_reset(struct cas *cp)
+{
+	int i;
+
+	/* do both TX and RX reset */
+	writel(0x1, cp->regs + REG_MAC_TX_RESET);
+	writel(0x1, cp->regs + REG_MAC_RX_RESET);
+
+	/* wait for TX */
+	i = STOP_TRIES;
+	while (i-- > 0) {
+		if (readl(cp->regs + REG_MAC_TX_RESET) == 0)
+			break;
+		udelay(10);
+	}
+
+	/* wait for RX */
+	i = STOP_TRIES;
+	while (i-- > 0) {
+		if (readl(cp->regs + REG_MAC_RX_RESET) == 0)
+			break;
+		udelay(10);
+	}
+
+	if (readl(cp->regs + REG_MAC_TX_RESET) |
+	    readl(cp->regs + REG_MAC_RX_RESET))
+		printk(KERN_ERR "%s: mac tx[%d]/rx[%d] reset failed [%08x]\n",
+		       cp->dev->name, readl(cp->regs + REG_MAC_TX_RESET),
+		       readl(cp->regs + REG_MAC_RX_RESET),
+		       readl(cp->regs + REG_MAC_STATE_MACHINE));
+}
+
+
+/* Must be invoked under cp->lock. */
+static void cas_init_mac(struct cas *cp)
+{
+	unsigned char *e = &cp->dev->dev_addr[0];
+	int i;
+#ifdef CONFIG_CASSINI_MULTICAST_REG_WRITE
+	u32 rxcfg;
+#endif
+	cas_mac_reset(cp);
+
+	/* setup core arbitration weight register */
+	writel(CAWR_RR_DIS, cp->regs + REG_CAWR);
+
+	/* XXX Use pci_dma_burst_advice() */
+#if !defined(CONFIG_SPARC64) && !defined(CONFIG_ALPHA)
+	/* set the infinite burst register for chips that don't have
+	 * pci issues.
+	 */
+	if ((cp->cas_flags & CAS_FLAG_TARGET_ABORT) == 0)
+		writel(INF_BURST_EN, cp->regs + REG_INF_BURST);
+#endif
+
+	writel(0x1BF0, cp->regs + REG_MAC_SEND_PAUSE);
+
+	writel(0x00, cp->regs + REG_MAC_IPG0);
+	writel(0x08, cp->regs + REG_MAC_IPG1);
+	writel(0x04, cp->regs + REG_MAC_IPG2);
+	
+	/* change later for 802.3z */
+	writel(0x40, cp->regs + REG_MAC_SLOT_TIME); 
+
+	/* min frame + FCS */
+	writel(ETH_ZLEN + 4, cp->regs + REG_MAC_FRAMESIZE_MIN);
+
+	/* Ethernet payload + header + FCS + optional VLAN tag. NOTE: we
+	 * specify the maximum frame size to prevent RX tag errors on 
+	 * oversized frames.
+	 */
+	writel(CAS_BASE(MAC_FRAMESIZE_MAX_BURST, 0x2000) |
+	       CAS_BASE(MAC_FRAMESIZE_MAX_FRAME, 
+			(CAS_MAX_MTU + ETH_HLEN + 4 + 4)), 
+	       cp->regs + REG_MAC_FRAMESIZE_MAX);
+
+	/* NOTE: crc_size is used as a surrogate for half-duplex. 
+	 * workaround saturn half-duplex issue by increasing preamble
+	 * size to 65 bytes.
+	 */
+	if ((cp->cas_flags & CAS_FLAG_SATURN) && cp->crc_size)
+		writel(0x41, cp->regs + REG_MAC_PA_SIZE);
+	else
+		writel(0x07, cp->regs + REG_MAC_PA_SIZE);
+	writel(0x04, cp->regs + REG_MAC_JAM_SIZE);
+	writel(0x10, cp->regs + REG_MAC_ATTEMPT_LIMIT);
+	writel(0x8808, cp->regs + REG_MAC_CTRL_TYPE);
+
+	writel((e[5] | (e[4] << 8)) & 0x3ff, cp->regs + REG_MAC_RANDOM_SEED);
+
+	writel(0, cp->regs + REG_MAC_ADDR_FILTER0);
+	writel(0, cp->regs + REG_MAC_ADDR_FILTER1);
+	writel(0, cp->regs + REG_MAC_ADDR_FILTER2);
+	writel(0, cp->regs + REG_MAC_ADDR_FILTER2_1_MASK);
+	writel(0, cp->regs + REG_MAC_ADDR_FILTER0_MASK);
+
+	/* setup mac address in perfect filter array */
+	for (i = 0; i < 45; i++)
+		writel(0x0, cp->regs + REG_MAC_ADDRN(i));
+
+	writel((e[4] << 8) | e[5], cp->regs + REG_MAC_ADDRN(0));
+	writel((e[2] << 8) | e[3], cp->regs + REG_MAC_ADDRN(1));
+	writel((e[0] << 8) | e[1], cp->regs + REG_MAC_ADDRN(2));
+
+	writel(0x0001, cp->regs + REG_MAC_ADDRN(42));
+	writel(0xc200, cp->regs + REG_MAC_ADDRN(43));
+	writel(0x0180, cp->regs + REG_MAC_ADDRN(44));
+
+#ifndef CONFIG_CASSINI_MULTICAST_REG_WRITE
+	cp->mac_rx_cfg = cas_setup_multicast(cp);
+#else
+	/* WTZ: Do what Adrian did in cas_set_multicast. Doing
+	 * a writel does not seem to be necessary because Cassini
+	 * seems to preserve the configuration when we do the reset.
+	 * If the chip is in trouble, though, it is not clear if we
+	 * can really count on this behavior. cas_set_multicast uses
+	 * spin_lock_irqsave, but we are called only in cas_init_hw and
+	 * cas_init_hw is protected by cas_lock_all, which calls
+	 * spin_lock_irq (so it doesn't need to save the flags, and
+	 * we should be OK for the writel, as that is the only 
+	 * difference).
+	 */
+	cp->mac_rx_cfg = rxcfg = cas_setup_multicast(cp);
+	writel(rxcfg, cp->regs + REG_MAC_RX_CFG);
+#endif
+	spin_lock(&cp->stat_lock[N_TX_RINGS]);
+	cas_clear_mac_err(cp);
+	spin_unlock(&cp->stat_lock[N_TX_RINGS]);
+
+	/* Setup MAC interrupts.  We want to get all of the interesting
+	 * counter expiration events, but we do not want to hear about
+	 * normal rx/tx as the DMA engine tells us that.
+	 */
+	writel(MAC_TX_FRAME_XMIT, cp->regs + REG_MAC_TX_MASK);
+	writel(MAC_RX_FRAME_RECV, cp->regs + REG_MAC_RX_MASK);
+
+	/* Don't enable even the PAUSE interrupts for now, we
+	 * make no use of those events other than to record them.
+	 */
+	writel(0xffffffff, cp->regs + REG_MAC_CTRL_MASK);
+}
+
+/* Must be invoked under cp->lock. */
+static void cas_init_pause_thresholds(struct cas *cp)
+{
+	/* Calculate pause thresholds.  Setting the OFF threshold to the
+	 * full RX fifo size effectively disables PAUSE generation
+	 */
+	if (cp->rx_fifo_size <= (2 * 1024)) {
+		cp->rx_pause_off = cp->rx_pause_on = cp->rx_fifo_size;
+	} else {
+		int max_frame = (cp->dev->mtu + ETH_HLEN + 4 + 4 + 64) & ~63;
+		if (max_frame * 3 > cp->rx_fifo_size) {
+			cp->rx_pause_off = 7104;
+			cp->rx_pause_on  = 960;
+		} else {
+			int off = (cp->rx_fifo_size - (max_frame * 2));
+			int on = off - max_frame;
+			cp->rx_pause_off = off;
+			cp->rx_pause_on = on;
+		}
+	}
+}
+
+static int cas_vpd_match(const void __iomem *p, const char *str)
+{
+	int len = strlen(str) + 1;
+	int i;
+	
+	for (i = 0; i < len; i++) {
+		if (readb(p + i) != str[i])
+			return 0;
+	}
+	return 1;
+}
+
+
+/* get the mac address by reading the vpd information in the rom.
+ * also get the phy type and determine if there's an entropy generator.
+ * NOTE: this is a bit convoluted for the following reasons:
+ *  1) vpd info has order-dependent mac addresses for multinic cards
+ *  2) the only way to determine the nic order is to use the slot
+ *     number.
+ *  3) fiber cards don't have bridges, so their slot numbers don't
+ *     mean anything.
+ *  4) we don't actually know we have a fiber card until after 
+ *     the mac addresses are parsed.
+ */
+static int cas_get_vpd_info(struct cas *cp, unsigned char *dev_addr,
+			    const int offset)
+{
+	void __iomem *p = cp->regs + REG_EXPANSION_ROM_RUN_START;
+	void __iomem *base, *kstart;
+	int i, len;
+	int found = 0;
+#define VPD_FOUND_MAC        0x01
+#define VPD_FOUND_PHY        0x02
+
+	int phy_type = CAS_PHY_MII_MDIO0; /* default phy type */
+	int mac_off  = 0;
+
+	/* give us access to the PROM */
+	writel(BIM_LOCAL_DEV_PROM | BIM_LOCAL_DEV_PAD,
+	       cp->regs + REG_BIM_LOCAL_DEV_EN);
+
+	/* check for an expansion rom */
+	if (readb(p) != 0x55 || readb(p + 1) != 0xaa)
+		goto use_random_mac_addr;
+
+	/* search for beginning of vpd */
+	base = 0;
+	for (i = 2; i < EXPANSION_ROM_SIZE; i++) {
+		/* check for PCIR */
+		if ((readb(p + i + 0) == 0x50) &&
+		    (readb(p + i + 1) == 0x43) &&
+		    (readb(p + i + 2) == 0x49) &&
+		    (readb(p + i + 3) == 0x52)) {
+			base = p + (readb(p + i + 8) | 
+				    (readb(p + i + 9) << 8));
+			break;
+		}		
+	}
+
+	if (!base || (readb(base) != 0x82))
+		goto use_random_mac_addr;
+	
+	i = (readb(base + 1) | (readb(base + 2) << 8)) + 3;
+	while (i < EXPANSION_ROM_SIZE) {
+		if (readb(base + i) != 0x90) /* no vpd found */
+			goto use_random_mac_addr;
+
+		/* found a vpd field */
+		len = readb(base + i + 1) | (readb(base + i + 2) << 8);
+
+		/* extract keywords */
+		kstart = base + i + 3;
+		p = kstart;
+		while ((p - kstart) < len) {
+			int klen = readb(p + 2);
+			int j;
+			char type;
+
+			p += 3;
+			
+			/* look for the following things:
+			 * -- correct length == 29
+			 * 3 (type) + 2 (size) + 
+			 * 18 (strlen("local-mac-address") + 1) + 
+			 * 6 (mac addr) 
+			 * -- VPD Instance 'I'
+			 * -- VPD Type Bytes 'B'
+			 * -- VPD data length == 6
+			 * -- property string == local-mac-address
+			 * 
+			 * -- correct length == 24
+			 * 3 (type) + 2 (size) + 
+			 * 12 (strlen("entropy-dev") + 1) + 
+			 * 7 (strlen("vms110") + 1)
+			 * -- VPD Instance 'I'
+			 * -- VPD Type String 'B'
+			 * -- VPD data length == 7
+			 * -- property string == entropy-dev
+			 *
+			 * -- correct length == 18
+			 * 3 (type) + 2 (size) + 
+			 * 9 (strlen("phy-type") + 1) + 
+			 * 4 (strlen("pcs") + 1)
+			 * -- VPD Instance 'I'
+			 * -- VPD Type String 'S'
+			 * -- VPD data length == 4
+			 * -- property string == phy-type
+			 * 
+			 * -- correct length == 23
+			 * 3 (type) + 2 (size) + 
+			 * 14 (strlen("phy-interface") + 1) + 
+			 * 4 (strlen("pcs") + 1)
+			 * -- VPD Instance 'I'
+			 * -- VPD Type String 'S'
+			 * -- VPD data length == 4
+			 * -- property string == phy-interface
+			 */
+			if (readb(p) != 'I')
+				goto next;
+
+			/* finally, check string and length */
+			type = readb(p + 3);
+			if (type == 'B') {
+				if ((klen == 29) && readb(p + 4) == 6 &&
+				    cas_vpd_match(p + 5, 
+						  "local-mac-address")) {
+					if (mac_off++ > offset) 
+						goto next;
+
+					/* set mac address */
+					for (j = 0; j < 6; j++) 
+						dev_addr[j] = 
+							readb(p + 23 + j);
+					goto found_mac;
+				}
+			}
+
+			if (type != 'S')
+				goto next;
+
+#ifdef USE_ENTROPY_DEV
+			if ((klen == 24) && 
+			    cas_vpd_match(p + 5, "entropy-dev") &&
+			    cas_vpd_match(p + 17, "vms110")) {
+				cp->cas_flags |= CAS_FLAG_ENTROPY_DEV;
+				goto next;
+			}
+#endif
+
+			if (found & VPD_FOUND_PHY)
+				goto next;
+
+			if ((klen == 18) && readb(p + 4) == 4 &&
+			    cas_vpd_match(p + 5, "phy-type")) {
+				if (cas_vpd_match(p + 14, "pcs")) {
+					phy_type = CAS_PHY_SERDES;
+					goto found_phy;
+				}
+			}
+			
+			if ((klen == 23) && readb(p + 4) == 4 &&
+			    cas_vpd_match(p + 5, "phy-interface")) {
+				if (cas_vpd_match(p + 19, "pcs")) {
+					phy_type = CAS_PHY_SERDES;
+					goto found_phy;
+				}
+			}
+found_mac:
+			found |= VPD_FOUND_MAC;
+			goto next;
+
+found_phy:
+			found |= VPD_FOUND_PHY;
+
+next:
+			p += klen;
+		}
+		i += len + 3;
+	}
+
+use_random_mac_addr:
+	if (found & VPD_FOUND_MAC)
+		goto done;
+
+	/* Sun MAC prefix then 3 random bytes. */
+	printk(PFX "MAC address not found in ROM VPD\n");
+	dev_addr[0] = 0x08;
+	dev_addr[1] = 0x00;
+	dev_addr[2] = 0x20;
+	get_random_bytes(dev_addr + 3, 3);
+
+done:
+	writel(0, cp->regs + REG_BIM_LOCAL_DEV_EN);
+	return phy_type;
+}
+
+/* check pci invariants */
+static void cas_check_pci_invariants(struct cas *cp)
+{
+	struct pci_dev *pdev = cp->pdev;
+	u8 rev;
+
+	cp->cas_flags = 0;
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
+	if ((pdev->vendor == PCI_VENDOR_ID_SUN) &&
+	    (pdev->device == PCI_DEVICE_ID_SUN_CASSINI)) {
+		if (rev >= CAS_ID_REVPLUS)
+			cp->cas_flags |= CAS_FLAG_REG_PLUS;
+		if (rev < CAS_ID_REVPLUS02u)
+			cp->cas_flags |= CAS_FLAG_TARGET_ABORT;
+
+		/* Original Cassini supports HW CSUM, but it's not
+		 * enabled by default as it can trigger TX hangs.
+		 */
+		if (rev < CAS_ID_REV2)
+			cp->cas_flags |= CAS_FLAG_NO_HW_CSUM;
+	} else {
+		/* Only sun has original cassini chips.  */
+		cp->cas_flags |= CAS_FLAG_REG_PLUS;
+
+		/* We use a flag because the same phy might be externally
+		 * connected.
+		 */
+		if ((pdev->vendor == PCI_VENDOR_ID_NS) &&
+		    (pdev->device == PCI_DEVICE_ID_NS_SATURN))
+			cp->cas_flags |= CAS_FLAG_SATURN;
+	}
+}
+
+
+static int cas_check_invariants(struct cas *cp)
+{
+	struct pci_dev *pdev = cp->pdev;
+	u32 cfg;
+	int i;
+
+	/* get page size for rx buffers. */
+	cp->page_order = 0; 
+#ifdef USE_PAGE_ORDER
+	if (PAGE_SHIFT < CAS_JUMBO_PAGE_SHIFT) {
+		/* see if we can allocate larger pages */
+		struct page *page = alloc_pages(GFP_ATOMIC, 
+						CAS_JUMBO_PAGE_SHIFT - 
+						PAGE_SHIFT);
+		if (page) {
+			__free_pages(page, CAS_JUMBO_PAGE_SHIFT - PAGE_SHIFT);
+			cp->page_order = CAS_JUMBO_PAGE_SHIFT - PAGE_SHIFT;
+		} else {
+			printk(PFX "MTU limited to %d bytes\n", CAS_MAX_MTU);
+		}
+	}
+#endif
+	cp->page_size = (PAGE_SIZE << cp->page_order);
+
+	/* Fetch the FIFO configurations. */
+	cp->tx_fifo_size = readl(cp->regs + REG_TX_FIFO_SIZE) * 64;
+	cp->rx_fifo_size = RX_FIFO_SIZE;
+
+	/* finish phy determination. MDIO1 takes precedence over MDIO0 if 
+	 * they're both connected.
+	 */
+	cp->phy_type = cas_get_vpd_info(cp, cp->dev->dev_addr, 
+					PCI_SLOT(pdev->devfn));
+	if (cp->phy_type & CAS_PHY_SERDES) {
+		cp->cas_flags |= CAS_FLAG_1000MB_CAP;
+		return 0; /* no more checking needed */
+	} 
+
+	/* MII */
+	cfg = readl(cp->regs + REG_MIF_CFG);
+	if (cfg & MIF_CFG_MDIO_1) {
+		cp->phy_type = CAS_PHY_MII_MDIO1;
+	} else if (cfg & MIF_CFG_MDIO_0) {
+		cp->phy_type = CAS_PHY_MII_MDIO0;
+	}
+
+	cas_mif_poll(cp, 0);
+	writel(PCS_DATAPATH_MODE_MII, cp->regs + REG_PCS_DATAPATH_MODE);
+
+	for (i = 0; i < 32; i++) {
+		u32 phy_id;
+		int j;
+
+		for (j = 0; j < 3; j++) {
+			cp->phy_addr = i;
+			phy_id = cas_phy_read(cp, MII_PHYSID1) << 16;
+			phy_id |= cas_phy_read(cp, MII_PHYSID2);
+			if (phy_id && (phy_id != 0xFFFFFFFF)) {
+				cp->phy_id = phy_id;
+				goto done;
+			}
+		}
+	}
+	printk(KERN_ERR PFX "MII phy did not respond [%08x]\n",
+	       readl(cp->regs + REG_MIF_STATE_MACHINE));
+	return -1;
+
+done:
+	/* see if we can do gigabit */
+	cfg = cas_phy_read(cp, MII_BMSR);
+	if ((cfg & CAS_BMSR_1000_EXTEND) && 
+	    cas_phy_read(cp, CAS_MII_1000_EXTEND))
+		cp->cas_flags |= CAS_FLAG_1000MB_CAP;
+	return 0;
+}
+
+/* Must be invoked under cp->lock. */
+static inline void cas_start_dma(struct cas *cp)
+{
+	int i;
+	u32 val;
+	int txfailed = 0;
+	
+	/* enable dma */
+	val = readl(cp->regs + REG_TX_CFG) | TX_CFG_DMA_EN;
+	writel(val, cp->regs + REG_TX_CFG);
+	val = readl(cp->regs + REG_RX_CFG) | RX_CFG_DMA_EN;
+	writel(val, cp->regs + REG_RX_CFG);
+
+	/* enable the mac */
+	val = readl(cp->regs + REG_MAC_TX_CFG) | MAC_TX_CFG_EN;
+	writel(val, cp->regs + REG_MAC_TX_CFG);
+	val = readl(cp->regs + REG_MAC_RX_CFG) | MAC_RX_CFG_EN;
+	writel(val, cp->regs + REG_MAC_RX_CFG);
+
+	i = STOP_TRIES;
+	while (i-- > 0) {
+		val = readl(cp->regs + REG_MAC_TX_CFG);
+		if ((val & MAC_TX_CFG_EN))
+			break;
+		udelay(10);
+	}
+	if (i < 0) txfailed = 1;
+	i = STOP_TRIES;
+	while (i-- > 0) {
+		val = readl(cp->regs + REG_MAC_RX_CFG);
+		if ((val & MAC_RX_CFG_EN)) {
+			if (txfailed) {
+			  printk(KERN_ERR 
+				 "%s: enabling mac failed [tx:%08x:%08x].\n", 
+				 cp->dev->name,
+				 readl(cp->regs + REG_MIF_STATE_MACHINE),
+				 readl(cp->regs + REG_MAC_STATE_MACHINE));
+			}
+			goto enable_rx_done;
+		}
+		udelay(10);
+	}
+	printk(KERN_ERR "%s: enabling mac failed [%s:%08x:%08x].\n", 
+	       cp->dev->name,
+	       (txfailed? "tx,rx":"rx"),
+	       readl(cp->regs + REG_MIF_STATE_MACHINE),
+	       readl(cp->regs + REG_MAC_STATE_MACHINE));
+
+enable_rx_done:
+	cas_unmask_intr(cp); /* enable interrupts */
+	writel(RX_DESC_RINGN_SIZE(0) - 4, cp->regs + REG_RX_KICK);
+	writel(0, cp->regs + REG_RX_COMP_TAIL);
+
+	if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
+		if (N_RX_DESC_RINGS > 1) 
+			writel(RX_DESC_RINGN_SIZE(1) - 4, 
+			       cp->regs + REG_PLUS_RX_KICK1);
+
+		for (i = 1; i < N_RX_COMP_RINGS; i++) 
+			writel(0, cp->regs + REG_PLUS_RX_COMPN_TAIL(i));
+	}
+}
+
+/* Must be invoked under cp->lock. */
+static void cas_read_pcs_link_mode(struct cas *cp, int *fd, int *spd,
+				   int *pause)
+{
+	u32 val = readl(cp->regs + REG_PCS_MII_LPA);
+	*fd     = (val & PCS_MII_LPA_FD) ? 1 : 0;
+	*pause  = (val & PCS_MII_LPA_SYM_PAUSE) ? 0x01 : 0x00;
+	if (val & PCS_MII_LPA_ASYM_PAUSE)
+		*pause |= 0x10;
+	*spd = 1000;
+}
+
+/* Must be invoked under cp->lock. */
+static void cas_read_mii_link_mode(struct cas *cp, int *fd, int *spd,
+				   int *pause)
+{
+	u32 val;
+
+	*fd = 0;
+	*spd = 10;
+	*pause = 0;
+	
+	/* use GMII registers */
+	val = cas_phy_read(cp, MII_LPA);
+	if (val & CAS_LPA_PAUSE)
+		*pause = 0x01;
+
+	if (val & CAS_LPA_ASYM_PAUSE)
+		*pause |= 0x10;
+
+	if (val & LPA_DUPLEX)
+		*fd = 1;
+	if (val & LPA_100)
+		*spd = 100;
+
+	if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
+		val = cas_phy_read(cp, CAS_MII_1000_STATUS);
+		if (val & (CAS_LPA_1000FULL | CAS_LPA_1000HALF))
+			*spd = 1000;
+		if (val & CAS_LPA_1000FULL)
+			*fd = 1;
+	}
+}
+
+/* A link-up condition has occurred, initialize and enable the
+ * rest of the chip.
+ *
+ * Must be invoked under cp->lock.
+ */
+static void cas_set_link_modes(struct cas *cp)
+{
+	u32 val;
+	int full_duplex, speed, pause;
+
+	full_duplex = 0;
+	speed = 10;
+	pause = 0;
+
+	if (CAS_PHY_MII(cp->phy_type)) {
+		cas_mif_poll(cp, 0);
+		val = cas_phy_read(cp, MII_BMCR);
+		if (val & BMCR_ANENABLE) {
+			cas_read_mii_link_mode(cp, &full_duplex, &speed, 
+					       &pause);
+		} else {
+			if (val & BMCR_FULLDPLX)
+				full_duplex = 1;
+
+			if (val & BMCR_SPEED100)
+				speed = 100;
+			else if (val & CAS_BMCR_SPEED1000)
+				speed = (cp->cas_flags & CAS_FLAG_1000MB_CAP) ?
+					1000 : 100;
+		}
+		cas_mif_poll(cp, 1);
+
+	} else {
+		val = readl(cp->regs + REG_PCS_MII_CTRL);
+		cas_read_pcs_link_mode(cp, &full_duplex, &speed, &pause);
+		if ((val & PCS_MII_AUTONEG_EN) == 0) {
+			if (val & PCS_MII_CTRL_DUPLEX)
+				full_duplex = 1;
+		}
+	}
+
+	if (netif_msg_link(cp))
+		printk(KERN_INFO "%s: Link up at %d Mbps, %s-duplex.\n",
+		       cp->dev->name, speed, (full_duplex ? "full" : "half"));
+
+	val = MAC_XIF_TX_MII_OUTPUT_EN | MAC_XIF_LINK_LED;
+	if (CAS_PHY_MII(cp->phy_type)) {
+		val |= MAC_XIF_MII_BUFFER_OUTPUT_EN;
+		if (!full_duplex)
+			val |= MAC_XIF_DISABLE_ECHO;
+	}
+	if (full_duplex) 
+		val |= MAC_XIF_FDPLX_LED;
+	if (speed == 1000)
+		val |= MAC_XIF_GMII_MODE;
+	writel(val, cp->regs + REG_MAC_XIF_CFG);
+
+	/* deal with carrier and collision detect. */
+	val = MAC_TX_CFG_IPG_EN;
+	if (full_duplex) {
+		val |= MAC_TX_CFG_IGNORE_CARRIER;
+		val |= MAC_TX_CFG_IGNORE_COLL;
+	} else {
+#ifndef USE_CSMA_CD_PROTO
+		val |= MAC_TX_CFG_NEVER_GIVE_UP_EN;
+		val |= MAC_TX_CFG_NEVER_GIVE_UP_LIM;
+#endif
+	}
+	/* val now set up for REG_MAC_TX_CFG */
+
+	/* If gigabit and half-duplex, enable carrier extension
+	 * mode.  increase slot time to 512 bytes as well. 
+	 * else, disable it and make sure slot time is 64 bytes.
+	 * also activate checksum bug workaround
+	 */
+	if ((speed == 1000) && !full_duplex) {
+		writel(val | MAC_TX_CFG_CARRIER_EXTEND, 
+		       cp->regs + REG_MAC_TX_CFG);
+
+		val = readl(cp->regs + REG_MAC_RX_CFG);
+		val &= ~MAC_RX_CFG_STRIP_FCS; /* checksum workaround */
+		writel(val | MAC_RX_CFG_CARRIER_EXTEND, 
+		       cp->regs + REG_MAC_RX_CFG);
+
+		writel(0x200, cp->regs + REG_MAC_SLOT_TIME);
+
+		cp->crc_size = 4;
+		/* minimum size gigabit frame at half duplex */
+		cp->min_frame_size = CAS_1000MB_MIN_FRAME;
+
+	} else {
+		writel(val, cp->regs + REG_MAC_TX_CFG);
+
+		/* checksum bug workaround. don't strip FCS when in 
+		 * half-duplex mode
+		 */
+		val = readl(cp->regs + REG_MAC_RX_CFG);
+		if (full_duplex) {
+			val |= MAC_RX_CFG_STRIP_FCS;
+			cp->crc_size = 0;
+			cp->min_frame_size = CAS_MIN_MTU;
+		} else {
+			val &= ~MAC_RX_CFG_STRIP_FCS;
+			cp->crc_size = 4;
+			cp->min_frame_size = CAS_MIN_FRAME;
+		}
+		writel(val & ~MAC_RX_CFG_CARRIER_EXTEND, 
+		       cp->regs + REG_MAC_RX_CFG);
+		writel(0x40, cp->regs + REG_MAC_SLOT_TIME);
+	}
+
+	if (netif_msg_link(cp)) {
+		if (pause & 0x01) {
+			printk(KERN_INFO "%s: Pause is enabled "
+			       "(rxfifo: %d off: %d on: %d)\n",
+			       cp->dev->name,
+			       cp->rx_fifo_size,
+			       cp->rx_pause_off,
+			       cp->rx_pause_on);
+		} else if (pause & 0x10) {
+			printk(KERN_INFO "%s: TX pause enabled\n",
+			       cp->dev->name);
+		} else {
+			printk(KERN_INFO "%s: Pause is disabled\n",
+			       cp->dev->name);
+		}
+	}
+
+	val = readl(cp->regs + REG_MAC_CTRL_CFG);
+	val &= ~(MAC_CTRL_CFG_SEND_PAUSE_EN | MAC_CTRL_CFG_RECV_PAUSE_EN);
+	if (pause) { /* symmetric or asymmetric pause */
+		val |= MAC_CTRL_CFG_SEND_PAUSE_EN;
+		if (pause & 0x01) { /* symmetric pause */
+			val |= MAC_CTRL_CFG_RECV_PAUSE_EN;
+		} 
+	}
+	writel(val, cp->regs + REG_MAC_CTRL_CFG);
+	cas_start_dma(cp);
+}
+
+/* Must be invoked under cp->lock. */
+static void cas_init_hw(struct cas *cp, int restart_link)
+{
+	if (restart_link)
+		cas_phy_init(cp);
+
+	cas_init_pause_thresholds(cp);
+	cas_init_mac(cp);
+	cas_init_dma(cp);
+
+	if (restart_link) {
+		/* Default aneg parameters */
+		cp->timer_ticks = 0;
+		cas_begin_auto_negotiation(cp, NULL);
+	} else if (cp->lstate == link_up) {
+		cas_set_link_modes(cp);
+		netif_carrier_on(cp->dev);
+	}
+}
+
+/* Must be invoked under cp->lock. on earlier cassini boards,
+ * SOFT_0 is tied to PCI reset. we use this to force a pci reset,
+ * let it settle out, and then restore pci state.
+ */
+static void cas_hard_reset(struct cas *cp)
+{
+	writel(BIM_LOCAL_DEV_SOFT_0, cp->regs + REG_BIM_LOCAL_DEV_EN); 
+	udelay(20);
+	pci_restore_state(cp->pdev);
+}
+
+
+static void cas_global_reset(struct cas *cp, int blkflag)
+{
+	int limit;
+
+	/* issue a global reset. don't use RSTOUT. */
+	if (blkflag && !CAS_PHY_MII(cp->phy_type)) {
+		/* For PCS, when the blkflag is set, we should set the
+		 * SW_REST_BLOCK_PCS_SLINK bit to prevent the results of
+		 * the last autonegotiation from being cleared.  We'll
+		 * need some special handling if the chip is set into a
+		 * loopback mode.
+		 */
+		writel((SW_RESET_TX | SW_RESET_RX | SW_RESET_BLOCK_PCS_SLINK), 
+		       cp->regs + REG_SW_RESET);
+	} else {
+		writel(SW_RESET_TX | SW_RESET_RX, cp->regs + REG_SW_RESET);
+	}
+
+	/* need to wait at least 3ms before polling register */
+	mdelay(3);
+
+	limit = STOP_TRIES;
+	while (limit-- > 0) {
+		u32 val = readl(cp->regs + REG_SW_RESET);
+		if ((val & (SW_RESET_TX | SW_RESET_RX)) == 0)
+			goto done;
+		udelay(10);
+	}
+	printk(KERN_ERR "%s: sw reset failed.\n", cp->dev->name);
+
+done:
+	/* enable various BIM interrupts */
+	writel(BIM_CFG_DPAR_INTR_ENABLE | BIM_CFG_RMA_INTR_ENABLE | 
+	       BIM_CFG_RTA_INTR_ENABLE, cp->regs + REG_BIM_CFG);
+
+	/* clear out pci error status mask for handled errors.
+	 * we don't deal with DMA counter overflows as they happen
+	 * all the time.
+	 */
+	writel(0xFFFFFFFFU & ~(PCI_ERR_BADACK | PCI_ERR_DTRTO | 
+			       PCI_ERR_OTHER | PCI_ERR_BIM_DMA_WRITE | 
+			       PCI_ERR_BIM_DMA_READ), cp->regs + 
+	       REG_PCI_ERR_STATUS_MASK);
+
+	/* set up for MII by default to address mac rx reset timeout
+	 * issue
+	 */
+	writel(PCS_DATAPATH_MODE_MII, cp->regs + REG_PCS_DATAPATH_MODE);
+}
+
+static void cas_reset(struct cas *cp, int blkflag)
+{
+	u32 val;
+
+	cas_mask_intr(cp);
+	cas_global_reset(cp, blkflag);
+	cas_mac_reset(cp);
+	cas_entropy_reset(cp);
+
+	/* disable dma engines. */
+	val = readl(cp->regs + REG_TX_CFG);
+	val &= ~TX_CFG_DMA_EN;
+	writel(val, cp->regs + REG_TX_CFG);
+
+	val = readl(cp->regs + REG_RX_CFG);
+	val &= ~RX_CFG_DMA_EN;
+	writel(val, cp->regs + REG_RX_CFG);
+
+	/* program header parser */
+	if ((cp->cas_flags & CAS_FLAG_TARGET_ABORT) ||
+	    (CAS_HP_ALT_FIRMWARE == cas_prog_null)) {
+		cas_load_firmware(cp, CAS_HP_FIRMWARE);
+	} else {
+		cas_load_firmware(cp, CAS_HP_ALT_FIRMWARE);
+	}
+
+	/* clear out error registers */
+	spin_lock(&cp->stat_lock[N_TX_RINGS]);
+	cas_clear_mac_err(cp);
+	spin_unlock(&cp->stat_lock[N_TX_RINGS]);
+}
+
+/* Shut down the chip, must be called with pm_sem held.  */
+static void cas_shutdown(struct cas *cp)
+{
+	unsigned long flags;
+
+	/* Make us not-running to avoid timers respawning */
+	cp->hw_running = 0;
+
+	del_timer_sync(&cp->link_timer);
+
+	/* Stop the reset task */
+#if 0
+	while (atomic_read(&cp->reset_task_pending_mtu) ||
+	       atomic_read(&cp->reset_task_pending_spare) ||
+	       atomic_read(&cp->reset_task_pending_all))
+		schedule();
+
+#else
+	while (atomic_read(&cp->reset_task_pending))
+		schedule();
+#endif	
+	/* Actually stop the chip */
+	cas_lock_all_save(cp, flags);
+	cas_reset(cp, 0);
+	if (cp->cas_flags & CAS_FLAG_SATURN)
+		cas_phy_powerdown(cp);
+	cas_unlock_all_restore(cp, flags);
+}
+
+static int cas_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct cas *cp = netdev_priv(dev);
+
+	if (new_mtu < CAS_MIN_MTU || new_mtu > CAS_MAX_MTU)
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	if (!netif_running(dev) || !netif_device_present(dev))
+		return 0;
+
+	/* let the reset task handle it */
+#if 1
+	atomic_inc(&cp->reset_task_pending);
+	if ((cp->phy_type & CAS_PHY_SERDES)) {
+		atomic_inc(&cp->reset_task_pending_all);
+	} else {
+		atomic_inc(&cp->reset_task_pending_mtu);
+	}
+	schedule_work(&cp->reset_task);
+#else
+	atomic_set(&cp->reset_task_pending, (cp->phy_type & CAS_PHY_SERDES) ? 
+		   CAS_RESET_ALL : CAS_RESET_MTU);
+	printk(KERN_ERR "reset called in cas_change_mtu\n");
+	schedule_work(&cp->reset_task);
+#endif
+
+	flush_scheduled_work();
+	return 0;
+}
+
+static void cas_clean_txd(struct cas *cp, int ring)
+{
+	struct cas_tx_desc *txd = cp->init_txds[ring];
+	struct sk_buff *skb, **skbs = cp->tx_skbs[ring];
+	u64 daddr, dlen;
+	int i, size;
+
+	size = TX_DESC_RINGN_SIZE(ring);
+	for (i = 0; i < size; i++) {
+		int frag;
+
+		if (skbs[i] == NULL)
+			continue;
+
+		skb = skbs[i];
+		skbs[i] = NULL;
+
+		for (frag = 0; frag <= skb_shinfo(skb)->nr_frags;  frag++) {
+			int ent = i & (size - 1);
+
+			/* first buffer is never a tiny buffer and so
+			 * needs to be unmapped.
+			 */
+			daddr = le64_to_cpu(txd[ent].buffer);
+			dlen  =  CAS_VAL(TX_DESC_BUFLEN, 
+					 le64_to_cpu(txd[ent].control));
+			pci_unmap_page(cp->pdev, daddr, dlen,
+				       PCI_DMA_TODEVICE);
+
+			if (frag != skb_shinfo(skb)->nr_frags) {
+				i++;
+
+				/* next buffer might by a tiny buffer.
+				 * skip past it.
+				 */
+				ent = i & (size - 1);
+				if (cp->tx_tiny_use[ring][ent].used)
+					i++;
+			}
+		}
+		dev_kfree_skb_any(skb);
+	}
+
+	/* zero out tiny buf usage */
+	memset(cp->tx_tiny_use[ring], 0, size*sizeof(*cp->tx_tiny_use[ring]));
+}
+
+/* freed on close */
+static inline void cas_free_rx_desc(struct cas *cp, int ring)
+{
+	cas_page_t **page = cp->rx_pages[ring];
+	int i, size;
+
+	size = RX_DESC_RINGN_SIZE(ring);
+	for (i = 0; i < size; i++) {
+		if (page[i]) {
+			cas_page_free(cp, page[i]);
+			page[i] = NULL;
+		}
+	}
+}
+
+static void cas_free_rxds(struct cas *cp)
+{
+	int i;
+
+	for (i = 0; i < N_RX_DESC_RINGS; i++)
+		cas_free_rx_desc(cp, i);
+}
+
+/* Must be invoked under cp->lock. */
+static void cas_clean_rings(struct cas *cp)
+{
+	int i;
+
+	/* need to clean all tx rings */
+	memset(cp->tx_old, 0, sizeof(*cp->tx_old)*N_TX_RINGS);
+	memset(cp->tx_new, 0, sizeof(*cp->tx_new)*N_TX_RINGS);
+	for (i = 0; i < N_TX_RINGS; i++)
+		cas_clean_txd(cp, i);
+
+	/* zero out init block */
+	memset(cp->init_block, 0, sizeof(struct cas_init_block));
+	cas_clean_rxds(cp);
+	cas_clean_rxcs(cp);
+}
+
+/* allocated on open */
+static inline int cas_alloc_rx_desc(struct cas *cp, int ring)
+{
+	cas_page_t **page = cp->rx_pages[ring];
+	int size, i = 0;
+
+	size = RX_DESC_RINGN_SIZE(ring);
+	for (i = 0; i < size; i++) {
+		if ((page[i] = cas_page_alloc(cp, GFP_KERNEL)) == NULL) 
+			return -1;
+	}
+	return 0;
+}
+
+static int cas_alloc_rxds(struct cas *cp)
+{
+	int i;
+
+	for (i = 0; i < N_RX_DESC_RINGS; i++) {
+		if (cas_alloc_rx_desc(cp, i) < 0) {
+			cas_free_rxds(cp);
+			return -1;
+		}
+	}
+	return 0;
+}
+
+static void cas_reset_task(void *data)
+{
+	struct cas *cp = (struct cas *) data;
+#if 0
+	int pending = atomic_read(&cp->reset_task_pending);
+#else
+	int pending_all = atomic_read(&cp->reset_task_pending_all);
+	int pending_spare = atomic_read(&cp->reset_task_pending_spare);
+	int pending_mtu = atomic_read(&cp->reset_task_pending_mtu);
+
+	if (pending_all == 0 && pending_spare == 0 && pending_mtu == 0) {
+		/* We can have more tasks scheduled than actually
+		 * needed.
+		 */
+		atomic_dec(&cp->reset_task_pending);
+		return;
+	}
+#endif
+	/* The link went down, we reset the ring, but keep
+	 * DMA stopped. Use this function for reset
+	 * on error as well.
+	 */
+	if (cp->hw_running) {
+		unsigned long flags;
+
+		/* Make sure we don't get interrupts or tx packets */
+		netif_device_detach(cp->dev);
+		cas_lock_all_save(cp, flags);
+
+		if (cp->opened) {
+			/* We call cas_spare_recover when we call cas_open.
+			 * but we do not initialize the lists cas_spare_recover
+			 * uses until cas_open is called.
+			 */
+			cas_spare_recover(cp, GFP_ATOMIC);
+		}
+#if 1
+		/* test => only pending_spare set */
+		if (!pending_all && !pending_mtu)
+			goto done;
+#else
+		if (pending == CAS_RESET_SPARE)
+			goto done;
+#endif
+		/* when pending == CAS_RESET_ALL, the following
+		 * call to cas_init_hw will restart auto negotiation.
+		 * Setting the second argument of cas_reset to
+		 * !(pending == CAS_RESET_ALL) will set this argument
+		 * to 1 (avoiding reinitializing the PHY for the normal 
+		 * PCS case) when auto negotiation is not restarted.
+		 */
+#if 1
+		cas_reset(cp, !(pending_all > 0));
+		if (cp->opened)
+			cas_clean_rings(cp);
+		cas_init_hw(cp, (pending_all > 0));
+#else
+		cas_reset(cp, !(pending == CAS_RESET_ALL));
+		if (cp->opened)
+			cas_clean_rings(cp);
+		cas_init_hw(cp, pending == CAS_RESET_ALL);
+#endif
+
+done:
+		cas_unlock_all_restore(cp, flags);
+		netif_device_attach(cp->dev);
+	}
+#if 1
+	atomic_sub(pending_all, &cp->reset_task_pending_all);
+	atomic_sub(pending_spare, &cp->reset_task_pending_spare);
+	atomic_sub(pending_mtu, &cp->reset_task_pending_mtu);
+	atomic_dec(&cp->reset_task_pending);
+#else
+	atomic_set(&cp->reset_task_pending, 0);
+#endif
+}
+
+static void cas_link_timer(unsigned long data)
+{
+	struct cas *cp = (struct cas *) data;
+	int mask, pending = 0, reset = 0;
+	unsigned long flags;
+
+	if (link_transition_timeout != 0 &&
+	    cp->link_transition_jiffies_valid &&
+	    ((jiffies - cp->link_transition_jiffies) > 
+	      (link_transition_timeout))) {
+		/* One-second counter so link-down workaround doesn't 
+		 * cause resets to occur so fast as to fool the switch
+		 * into thinking the link is down.
+		 */
+		cp->link_transition_jiffies_valid = 0;
+	}
+
+	if (!cp->hw_running)
+		return;
+
+	spin_lock_irqsave(&cp->lock, flags);
+	cas_lock_tx(cp);
+	cas_entropy_gather(cp);
+
+	/* If the link task is still pending, we just
+	 * reschedule the link timer
+	 */
+#if 1
+	if (atomic_read(&cp->reset_task_pending_all) ||
+	    atomic_read(&cp->reset_task_pending_spare) ||
+	    atomic_read(&cp->reset_task_pending_mtu)) 
+		goto done;
+#else
+	if (atomic_read(&cp->reset_task_pending)) 
+		goto done;
+#endif
+
+	/* check for rx cleaning */
+	if ((mask = (cp->cas_flags & CAS_FLAG_RXD_POST_MASK))) {
+		int i, rmask;
+
+		for (i = 0; i < MAX_RX_DESC_RINGS; i++) {
+			rmask = CAS_FLAG_RXD_POST(i);
+			if ((mask & rmask) == 0)
+				continue;
+
+			/* post_rxds will do a mod_timer */
+			if (cas_post_rxds_ringN(cp, i, cp->rx_last[i]) < 0) {
+				pending = 1;
+				continue;
+			}
+			cp->cas_flags &= ~rmask;
+		}
+	}
+
+	if (CAS_PHY_MII(cp->phy_type)) {
+		u16 bmsr;
+		cas_mif_poll(cp, 0);
+		bmsr = cas_phy_read(cp, MII_BMSR);
+		/* WTZ: Solaris driver reads this twice, but that
+		 * may be due to the PCS case and the use of a
+		 * common implementation. Read it twice here to be
+		 * safe.
+		 */
+		bmsr = cas_phy_read(cp, MII_BMSR);
+		cas_mif_poll(cp, 1);
+		readl(cp->regs + REG_MIF_STATUS); /* avoid dups */
+		reset = cas_mii_link_check(cp, bmsr);
+	} else {
+		reset = cas_pcs_link_check(cp);
+	}
+
+	if (reset)
+		goto done;
+
+	/* check for tx state machine confusion */
+	if ((readl(cp->regs + REG_MAC_TX_STATUS) & MAC_TX_FRAME_XMIT) == 0) {
+		u32 val = readl(cp->regs + REG_MAC_STATE_MACHINE);
+		u32 wptr, rptr;
+		int tlm  = CAS_VAL(MAC_SM_TLM, val);
+
+		if (((tlm == 0x5) || (tlm == 0x3)) &&
+		    (CAS_VAL(MAC_SM_ENCAP_SM, val) == 0)) {
+			if (netif_msg_tx_err(cp))
+				printk(KERN_DEBUG "%s: tx err: "
+				       "MAC_STATE[%08x]\n",
+				       cp->dev->name, val);
+			reset = 1;
+			goto done;
+		}
+
+		val  = readl(cp->regs + REG_TX_FIFO_PKT_CNT);
+		wptr = readl(cp->regs + REG_TX_FIFO_WRITE_PTR);
+		rptr = readl(cp->regs + REG_TX_FIFO_READ_PTR);
+		if ((val == 0) && (wptr != rptr)) {
+			if (netif_msg_tx_err(cp))
+				printk(KERN_DEBUG "%s: tx err: "
+				       "TX_FIFO[%08x:%08x:%08x]\n",
+				       cp->dev->name, val, wptr, rptr);
+			reset = 1;
+		}
+
+		if (reset)
+			cas_hard_reset(cp);
+	}
+
+done:
+	if (reset) {
+#if 1
+		atomic_inc(&cp->reset_task_pending);
+		atomic_inc(&cp->reset_task_pending_all);
+		schedule_work(&cp->reset_task);
+#else
+		atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
+		printk(KERN_ERR "reset called in cas_link_timer\n");
+		schedule_work(&cp->reset_task);
+#endif
+	}
+
+	if (!pending)
+		mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
+	cas_unlock_tx(cp);
+	spin_unlock_irqrestore(&cp->lock, flags);
+}
+
+/* tiny buffers are used to avoid target abort issues with 
+ * older cassini's
+ */
+static void cas_tx_tiny_free(struct cas *cp)
+{
+	struct pci_dev *pdev = cp->pdev;
+	int i;
+
+	for (i = 0; i < N_TX_RINGS; i++) {
+		if (!cp->tx_tiny_bufs[i])
+			continue;
+
+		pci_free_consistent(pdev, TX_TINY_BUF_BLOCK, 
+				    cp->tx_tiny_bufs[i],
+				    cp->tx_tiny_dvma[i]);
+		cp->tx_tiny_bufs[i] = NULL;
+	}
+}
+
+static int cas_tx_tiny_alloc(struct cas *cp)
+{
+	struct pci_dev *pdev = cp->pdev;
+	int i;
+
+	for (i = 0; i < N_TX_RINGS; i++) {
+		cp->tx_tiny_bufs[i] = 
+			pci_alloc_consistent(pdev, TX_TINY_BUF_BLOCK,
+					     &cp->tx_tiny_dvma[i]);
+		if (!cp->tx_tiny_bufs[i]) {
+			cas_tx_tiny_free(cp);
+			return -1;
+		}
+	}
+	return 0;
+}
+
+
+static int cas_open(struct net_device *dev)
+{
+	struct cas *cp = netdev_priv(dev);
+	int hw_was_up, err;
+	unsigned long flags;
+
+	down(&cp->pm_sem);
+
+	hw_was_up = cp->hw_running;
+
+	/* The power-management semaphore protects the hw_running
+	 * etc. state so it is safe to do this bit without cp->lock
+	 */
+	if (!cp->hw_running) {
+		/* Reset the chip */
+		cas_lock_all_save(cp, flags);
+		/* We set the second arg to cas_reset to zero
+		 * because cas_init_hw below will have its second 
+		 * argument set to non-zero, which will force
+		 * autonegotiation to start.
+		 */
+		cas_reset(cp, 0);
+		cp->hw_running = 1;
+		cas_unlock_all_restore(cp, flags);
+	}
+
+	if (cas_tx_tiny_alloc(cp) < 0)
+		return -ENOMEM;
+
+	/* alloc rx descriptors */
+	err = -ENOMEM;
+	if (cas_alloc_rxds(cp) < 0)
+		goto err_tx_tiny;
+	
+	/* allocate spares */
+	cas_spare_init(cp);
+	cas_spare_recover(cp, GFP_KERNEL);
+
+	/* We can now request the interrupt as we know it's masked
+	 * on the controller. cassini+ has up to 4 interrupts
+	 * that can be used, but you need to do explicit pci interrupt 
+	 * mapping to expose them
+	 */
+	if (request_irq(cp->pdev->irq, cas_interrupt,
+			SA_SHIRQ, dev->name, (void *) dev)) {
+		printk(KERN_ERR "%s: failed to request irq !\n", 
+		       cp->dev->name);
+		err = -EAGAIN;
+		goto err_spare;
+	}
+
+	/* init hw */
+	cas_lock_all_save(cp, flags);
+	cas_clean_rings(cp);
+	cas_init_hw(cp, !hw_was_up);
+	cp->opened = 1;
+	cas_unlock_all_restore(cp, flags);
+
+	netif_start_queue(dev);
+	up(&cp->pm_sem);
+	return 0;
+
+err_spare:
+	cas_spare_free(cp);
+	cas_free_rxds(cp);
+err_tx_tiny:
+	cas_tx_tiny_free(cp);
+	up(&cp->pm_sem);
+	return err;
+}
+
+static int cas_close(struct net_device *dev)
+{
+	unsigned long flags;
+	struct cas *cp = netdev_priv(dev);
+
+	/* Make sure we don't get distracted by suspend/resume */
+	down(&cp->pm_sem);
+
+	netif_stop_queue(dev);
+
+	/* Stop traffic, mark us closed */
+	cas_lock_all_save(cp, flags);
+	cp->opened = 0;	
+	cas_reset(cp, 0);
+	cas_phy_init(cp); 
+	cas_begin_auto_negotiation(cp, NULL);
+	cas_clean_rings(cp);
+	cas_unlock_all_restore(cp, flags);
+
+	free_irq(cp->pdev->irq, (void *) dev);
+	cas_spare_free(cp);
+	cas_free_rxds(cp);
+	cas_tx_tiny_free(cp);
+	up(&cp->pm_sem);
+	return 0;
+}
+
+static struct {
+	const char name[ETH_GSTRING_LEN];
+} ethtool_cassini_statnames[] = {
+	{"collisions"},
+	{"rx_bytes"},
+	{"rx_crc_errors"},
+	{"rx_dropped"},
+	{"rx_errors"},
+	{"rx_fifo_errors"},
+	{"rx_frame_errors"},
+	{"rx_length_errors"},
+	{"rx_over_errors"},
+	{"rx_packets"},
+	{"tx_aborted_errors"},
+	{"tx_bytes"},
+	{"tx_dropped"},
+	{"tx_errors"},
+	{"tx_fifo_errors"},
+	{"tx_packets"}
+};
+#define CAS_NUM_STAT_KEYS (sizeof(ethtool_cassini_statnames)/ETH_GSTRING_LEN)
+
+static struct {
+	const int offsets;	/* neg. values for 2nd arg to cas_read_phy */
+} ethtool_register_table[] = {
+	{-MII_BMSR},
+	{-MII_BMCR},
+	{REG_CAWR},
+	{REG_INF_BURST},
+	{REG_BIM_CFG},
+	{REG_RX_CFG},
+	{REG_HP_CFG},
+	{REG_MAC_TX_CFG},
+	{REG_MAC_RX_CFG},
+	{REG_MAC_CTRL_CFG},
+	{REG_MAC_XIF_CFG},
+	{REG_MIF_CFG},
+	{REG_PCS_CFG},
+	{REG_SATURN_PCFG},
+	{REG_PCS_MII_STATUS},
+	{REG_PCS_STATE_MACHINE},
+	{REG_MAC_COLL_EXCESS},
+	{REG_MAC_COLL_LATE}
+};
+#define CAS_REG_LEN 	(sizeof(ethtool_register_table)/sizeof(int))
+#define CAS_MAX_REGS 	(sizeof (u32)*CAS_REG_LEN)
+
+static u8 *cas_get_regs(struct cas *cp)
+{
+	u8 *ptr = kmalloc(CAS_MAX_REGS, GFP_KERNEL);
+	u8 *p;
+	int i;
+	unsigned long flags;
+
+	if (!ptr)
+		return NULL;
+
+	spin_lock_irqsave(&cp->lock, flags);
+	for (i = 0, p = ptr; i < CAS_REG_LEN ; i ++, p += sizeof(u32)) {
+		u16 hval;
+		u32 val;
+		if (ethtool_register_table[i].offsets < 0) {
+			hval = cas_phy_read(cp,
+				    -ethtool_register_table[i].offsets);
+			val = hval;
+		} else {
+			val= readl(cp->regs+ethtool_register_table[i].offsets);
+		}
+		memcpy(p, (u8 *)&val, sizeof(u32));
+	}
+	spin_unlock_irqrestore(&cp->lock, flags);
+
+	return ptr;
+}
+
+static struct net_device_stats *cas_get_stats(struct net_device *dev)
+{
+	struct cas *cp = netdev_priv(dev);
+	struct net_device_stats *stats = cp->net_stats;
+	unsigned long flags;
+	int i;
+	unsigned long tmp;
+
+	/* we collate all of the stats into net_stats[N_TX_RING] */
+	if (!cp->hw_running)
+		return stats + N_TX_RINGS;
+	
+	/* collect outstanding stats */
+	/* WTZ: the Cassini spec gives these as 16 bit counters but
+	 * stored in 32-bit words.  Added a mask of 0xffff to be safe,
+	 * in case the chip somehow puts any garbage in the other bits.
+	 * Also, counter usage didn't seem to mach what Adrian did
+	 * in the parts of the code that set these quantities. Made
+	 * that consistent.
+	 */
+	spin_lock_irqsave(&cp->stat_lock[N_TX_RINGS], flags);
+	stats[N_TX_RINGS].rx_crc_errors += 
+	  readl(cp->regs + REG_MAC_FCS_ERR) & 0xffff;
+	stats[N_TX_RINGS].rx_frame_errors += 
+		readl(cp->regs + REG_MAC_ALIGN_ERR) &0xffff;
+	stats[N_TX_RINGS].rx_length_errors += 
+		readl(cp->regs + REG_MAC_LEN_ERR) & 0xffff;
+#if 1
+	tmp = (readl(cp->regs + REG_MAC_COLL_EXCESS) & 0xffff) +
+		(readl(cp->regs + REG_MAC_COLL_LATE) & 0xffff);
+	stats[N_TX_RINGS].tx_aborted_errors += tmp;
+	stats[N_TX_RINGS].collisions +=
+	  tmp + (readl(cp->regs + REG_MAC_COLL_NORMAL) & 0xffff);
+#else
+	stats[N_TX_RINGS].tx_aborted_errors += 
+		readl(cp->regs + REG_MAC_COLL_EXCESS);
+	stats[N_TX_RINGS].collisions += readl(cp->regs + REG_MAC_COLL_EXCESS) +
+		readl(cp->regs + REG_MAC_COLL_LATE);
+#endif
+	cas_clear_mac_err(cp);
+
+	/* saved bits that are unique to ring 0 */
+	spin_lock(&cp->stat_lock[0]);
+	stats[N_TX_RINGS].collisions        += stats[0].collisions;
+	stats[N_TX_RINGS].rx_over_errors    += stats[0].rx_over_errors;
+	stats[N_TX_RINGS].rx_frame_errors   += stats[0].rx_frame_errors;
+	stats[N_TX_RINGS].rx_fifo_errors    += stats[0].rx_fifo_errors;
+	stats[N_TX_RINGS].tx_aborted_errors += stats[0].tx_aborted_errors;
+	stats[N_TX_RINGS].tx_fifo_errors    += stats[0].tx_fifo_errors;
+	spin_unlock(&cp->stat_lock[0]);
+
+	for (i = 0; i < N_TX_RINGS; i++) {
+		spin_lock(&cp->stat_lock[i]);
+		stats[N_TX_RINGS].rx_length_errors += 
+			stats[i].rx_length_errors;
+		stats[N_TX_RINGS].rx_crc_errors += stats[i].rx_crc_errors;
+		stats[N_TX_RINGS].rx_packets    += stats[i].rx_packets;
+		stats[N_TX_RINGS].tx_packets    += stats[i].tx_packets;
+		stats[N_TX_RINGS].rx_bytes      += stats[i].rx_bytes;
+		stats[N_TX_RINGS].tx_bytes      += stats[i].tx_bytes;
+		stats[N_TX_RINGS].rx_errors     += stats[i].rx_errors;
+		stats[N_TX_RINGS].tx_errors     += stats[i].tx_errors;
+		stats[N_TX_RINGS].rx_dropped    += stats[i].rx_dropped;
+		stats[N_TX_RINGS].tx_dropped    += stats[i].tx_dropped;
+		memset(stats + i, 0, sizeof(struct net_device_stats));
+		spin_unlock(&cp->stat_lock[i]);
+	}
+	spin_unlock_irqrestore(&cp->stat_lock[N_TX_RINGS], flags);
+	return stats + N_TX_RINGS;
+}
+
+
+static void cas_set_multicast(struct net_device *dev)
+{
+	struct cas *cp = netdev_priv(dev);
+	u32 rxcfg, rxcfg_new;
+	unsigned long flags;
+	int limit = STOP_TRIES;
+	
+	if (!cp->hw_running)
+		return;
+		
+	spin_lock_irqsave(&cp->lock, flags);
+	rxcfg = readl(cp->regs + REG_MAC_RX_CFG);
+
+	/* disable RX MAC and wait for completion */
+	writel(rxcfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
+	while (readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_EN) {
+		if (!limit--)
+			break;
+		udelay(10);
+	}
+
+	/* disable hash filter and wait for completion */
+	limit = STOP_TRIES;
+	rxcfg &= ~(MAC_RX_CFG_PROMISC_EN | MAC_RX_CFG_HASH_FILTER_EN);
+	writel(rxcfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
+	while (readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_HASH_FILTER_EN) {
+		if (!limit--)
+			break;
+		udelay(10);
+	}
+
+	/* program hash filters */
+	cp->mac_rx_cfg = rxcfg_new = cas_setup_multicast(cp);
+	rxcfg |= rxcfg_new;
+	writel(rxcfg, cp->regs + REG_MAC_RX_CFG);
+	spin_unlock_irqrestore(&cp->lock, flags);
+}
+
+/* Eventually add support for changing the advertisement
+ * on autoneg.
+ */
+static int cas_ethtool_ioctl(struct net_device *dev, void *ep_user)
+{
+	struct cas *cp = netdev_priv(dev);
+	u16 bmcr;
+	int full_duplex, speed, pause;
+	struct ethtool_cmd ecmd;
+	unsigned long flags;
+	enum link_state linkstate = link_up;
+
+	if (copy_from_user(&ecmd, ep_user, sizeof(ecmd)))
+		return -EFAULT;
+		
+	switch(ecmd.cmd) {
+        case ETHTOOL_GDRVINFO: {
+		struct ethtool_drvinfo info = { cmd: ETHTOOL_GDRVINFO };
+
+		strncpy(info.driver, DRV_MODULE_NAME,
+			ETHTOOL_BUSINFO_LEN);
+		strncpy(info.version, DRV_MODULE_VERSION,
+			ETHTOOL_BUSINFO_LEN);
+		info.fw_version[0] = '\0';
+		strncpy(info.bus_info, pci_name(cp->pdev),
+			ETHTOOL_BUSINFO_LEN);
+		info.regdump_len = cp->casreg_len < CAS_MAX_REGS ?
+			cp->casreg_len : CAS_MAX_REGS;
+		info.n_stats = CAS_NUM_STAT_KEYS;
+		if (copy_to_user(ep_user, &info, sizeof(info)))
+			return -EFAULT;
+
+		return 0;
+	}
+
+	case ETHTOOL_GSET:
+		ecmd.advertising = 0;
+		ecmd.supported = SUPPORTED_Autoneg;
+		if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
+			ecmd.supported |= SUPPORTED_1000baseT_Full;
+			ecmd.advertising |= ADVERTISED_1000baseT_Full;
+		}
+
+		/* Record PHY settings if HW is on. */
+		spin_lock_irqsave(&cp->lock, flags);
+		bmcr = 0;
+		linkstate = cp->lstate;
+		if (CAS_PHY_MII(cp->phy_type)) {
+			ecmd.port = PORT_MII;
+			ecmd.transceiver = (cp->cas_flags & CAS_FLAG_SATURN) ?
+				XCVR_INTERNAL : XCVR_EXTERNAL;
+			ecmd.phy_address = cp->phy_addr;
+			ecmd.advertising |= ADVERTISED_TP | ADVERTISED_MII |
+				ADVERTISED_10baseT_Half | 
+				ADVERTISED_10baseT_Full | 
+				ADVERTISED_100baseT_Half | 
+				ADVERTISED_100baseT_Full;
+
+			ecmd.supported |=
+				(SUPPORTED_10baseT_Half | 
+				 SUPPORTED_10baseT_Full |
+				 SUPPORTED_100baseT_Half | 
+				 SUPPORTED_100baseT_Full |
+				 SUPPORTED_TP | SUPPORTED_MII);
+
+			if (cp->hw_running) {
+				cas_mif_poll(cp, 0);
+				bmcr = cas_phy_read(cp, MII_BMCR);
+				cas_read_mii_link_mode(cp, &full_duplex, 
+						       &speed, &pause);
+				cas_mif_poll(cp, 1);
+			}
+
+		} else {
+			ecmd.port = PORT_FIBRE;
+			ecmd.transceiver = XCVR_INTERNAL;
+			ecmd.phy_address = 0;
+			ecmd.supported   |= SUPPORTED_FIBRE;
+			ecmd.advertising |= ADVERTISED_FIBRE;
+
+			if (cp->hw_running) {
+				/* pcs uses the same bits as mii */ 
+				bmcr = readl(cp->regs + REG_PCS_MII_CTRL);
+				cas_read_pcs_link_mode(cp, &full_duplex, 
+						       &speed, &pause);
+			}
+		}
+		spin_unlock_irqrestore(&cp->lock, flags);
+
+		if (bmcr & BMCR_ANENABLE) {
+			ecmd.advertising |= ADVERTISED_Autoneg;
+			ecmd.autoneg = AUTONEG_ENABLE;
+			ecmd.speed = ((speed == 10) ?
+				      SPEED_10 :
+				      ((speed == 1000) ?
+				       SPEED_1000 : SPEED_100));
+			ecmd.duplex = full_duplex ? DUPLEX_FULL : DUPLEX_HALF;
+		} else {
+			ecmd.autoneg = AUTONEG_DISABLE;
+			ecmd.speed =
+				(bmcr & CAS_BMCR_SPEED1000) ?
+				SPEED_1000 : 
+				((bmcr & BMCR_SPEED100) ? SPEED_100: 
+				 SPEED_10);
+			ecmd.duplex =
+				(bmcr & BMCR_FULLDPLX) ?
+				DUPLEX_FULL : DUPLEX_HALF;
+		}
+		if (linkstate != link_up) {
+			/* Force these to "unknown" if the link is not up and
+			 * autonogotiation in enabled. We can set the link 
+			 * speed to 0, but not ecmd.duplex,
+			 * because its legal values are 0 and 1.  Ethtool will
+			 * print the value reported in parentheses after the
+			 * word "Unknown" for unrecognized values.
+			 *
+			 * If in forced mode, we report the speed and duplex
+			 * settings that we configured.
+			 */
+			if (cp->link_cntl & BMCR_ANENABLE) {
+				ecmd.speed = 0;
+				ecmd.duplex = 0xff;
+			} else {
+				ecmd.speed = SPEED_10;
+				if (cp->link_cntl & BMCR_SPEED100) {
+					ecmd.speed = SPEED_100;
+				} else if (cp->link_cntl & CAS_BMCR_SPEED1000) {
+					ecmd.speed = SPEED_1000;
+				}
+				ecmd.duplex = (cp->link_cntl & BMCR_FULLDPLX)?
+					DUPLEX_FULL : DUPLEX_HALF;
+			}
+		}
+		if (copy_to_user(ep_user, &ecmd, sizeof(ecmd)))
+			return -EFAULT;
+		return 0;
+
+	case ETHTOOL_SSET:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		/* Verify the settings we care about. */
+		if (ecmd.autoneg != AUTONEG_ENABLE &&
+		    ecmd.autoneg != AUTONEG_DISABLE)
+			return -EINVAL;
+
+		if (ecmd.autoneg == AUTONEG_DISABLE &&
+		    ((ecmd.speed != SPEED_1000 &&
+		      ecmd.speed != SPEED_100 &&
+		      ecmd.speed != SPEED_10) ||
+		     (ecmd.duplex != DUPLEX_HALF &&
+		      ecmd.duplex != DUPLEX_FULL)))
+			return -EINVAL;
+
+		/* Apply settings and restart link process. */
+		spin_lock_irqsave(&cp->lock, flags);
+		cas_begin_auto_negotiation(cp, &ecmd);
+		spin_unlock_irqrestore(&cp->lock, flags);
+		return 0;
+
+	case ETHTOOL_NWAY_RST:
+		if ((cp->link_cntl & BMCR_ANENABLE) == 0)
+			return -EINVAL;
+
+		/* Restart link process. */
+		spin_lock_irqsave(&cp->lock, flags);
+		cas_begin_auto_negotiation(cp, NULL);
+		spin_unlock_irqrestore(&cp->lock, flags);
+
+		return 0;
+
+	case ETHTOOL_GWOL:
+	case ETHTOOL_SWOL:
+		break; /* doesn't exist */
+
+	/* get link status */
+	case ETHTOOL_GLINK: {
+		struct ethtool_value edata = { cmd: ETHTOOL_GLINK };
+
+		edata.data = (cp->lstate == link_up);
+		if (copy_to_user(ep_user, &edata, sizeof(edata)))
+			return -EFAULT;
+		return 0;
+	}
+
+	/* get message-level */
+	case ETHTOOL_GMSGLVL: {
+		struct ethtool_value edata = { cmd: ETHTOOL_GMSGLVL };
+
+		edata.data = cp->msg_enable;
+		if (copy_to_user(ep_user, &edata, sizeof(edata)))
+			return -EFAULT;
+		return 0;
+	}
+
+	/* set message-level */
+	case ETHTOOL_SMSGLVL: {
+		struct ethtool_value edata;
+
+		if (!capable(CAP_NET_ADMIN)) {
+			return (-EPERM);
+		}
+		if (copy_from_user(&edata, ep_user, sizeof(edata)))
+			return -EFAULT;
+		cp->msg_enable = edata.data;
+		return 0;
+	}
+
+	case ETHTOOL_GREGS: {
+		struct ethtool_regs edata;
+		u8 *ptr;
+		int len = cp->casreg_len < CAS_MAX_REGS ?
+			cp->casreg_len: CAS_MAX_REGS;
+
+		if (copy_from_user(&edata, ep_user, sizeof (edata)))
+			return -EFAULT;
+
+		if (edata.len > len)
+			edata.len = len;
+		edata.version = 0;
+		if (copy_to_user (ep_user, &edata, sizeof(edata)))
+			return -EFAULT;
+
+		/* cas_get_regs handles locks (cp->lock).  */
+		ptr = cas_get_regs(cp);
+		if (ptr == NULL)
+			return -ENOMEM;
+		if (copy_to_user(ep_user + sizeof (edata), ptr, edata.len))
+			return -EFAULT;
+
+		kfree(ptr);
+		return (0);
+	}
+	case ETHTOOL_GSTRINGS: {
+		struct ethtool_gstrings edata;
+		int len;
+
+		if (copy_from_user(&edata, ep_user, sizeof(edata)))
+			return -EFAULT;
+
+		len = edata.len;
+		switch(edata.string_set) {
+		case ETH_SS_STATS:
+			edata.len = (len < CAS_NUM_STAT_KEYS) ?
+				len : CAS_NUM_STAT_KEYS;
+			if (copy_to_user(ep_user, &edata, sizeof(edata)))
+				return -EFAULT;
+
+			if (copy_to_user(ep_user + sizeof(edata),
+					 &ethtool_cassini_statnames, 
+					 (edata.len * ETH_GSTRING_LEN)))
+				return -EFAULT;
+			return 0;
+		default:
+			return -EINVAL;
+		}
+	}
+	case ETHTOOL_GSTATS: {
+		int i = 0;
+		u64 *tmp;
+		struct ethtool_stats edata;
+		struct net_device_stats *stats;
+		int len;
+
+		if (copy_from_user(&edata, ep_user, sizeof(edata)))
+			return -EFAULT;
+
+		len = edata.n_stats;
+		stats = cas_get_stats(cp->dev);
+		edata.cmd = ETHTOOL_GSTATS;
+		edata.n_stats = (len < CAS_NUM_STAT_KEYS) ?
+			len : CAS_NUM_STAT_KEYS;
+		if (copy_to_user(ep_user, &edata, sizeof (edata)))
+			return -EFAULT;
+
+		tmp = kmalloc(sizeof(u64)*CAS_NUM_STAT_KEYS, GFP_KERNEL);
+		if (tmp) {
+			tmp[i++] = stats->collisions;
+			tmp[i++] = stats->rx_bytes;
+			tmp[i++] = stats->rx_crc_errors;
+			tmp[i++] = stats->rx_dropped;
+			tmp[i++] = stats->rx_errors;
+			tmp[i++] = stats->rx_fifo_errors;
+			tmp[i++] = stats->rx_frame_errors;
+			tmp[i++] = stats->rx_length_errors;
+			tmp[i++] = stats->rx_over_errors;
+			tmp[i++] = stats->rx_packets;
+			tmp[i++] = stats->tx_aborted_errors;
+			tmp[i++] = stats->tx_bytes;
+			tmp[i++] = stats->tx_dropped;
+			tmp[i++] = stats->tx_errors;
+			tmp[i++] = stats->tx_fifo_errors;
+			tmp[i++] = stats->tx_packets;
+			BUG_ON(i != CAS_NUM_STAT_KEYS);
+
+			i = copy_to_user(ep_user + sizeof(edata),
+					 tmp, sizeof(u64)*edata.n_stats);
+			kfree(tmp);
+		} else {
+			return -ENOMEM;
+		}
+		if (i)
+			return -EFAULT;
+		return 0;
+	}
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int cas_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct cas *cp = netdev_priv(dev);
+	struct mii_ioctl_data *data = (struct mii_ioctl_data *)&ifr->ifr_data;
+	unsigned long flags;
+	int rc = -EOPNOTSUPP;
+	
+	/* Hold the PM semaphore while doing ioctl's or we may collide
+	 * with open/close and power management and oops.
+	 */
+	down(&cp->pm_sem);
+	switch (cmd) {
+	case SIOCETHTOOL:
+		rc = cas_ethtool_ioctl(dev, ifr->ifr_data);
+		break;
+
+	case SIOCGMIIPHY:		/* Get address of MII PHY in use. */
+		data->phy_id = cp->phy_addr;
+		/* Fallthrough... */
+
+	case SIOCGMIIREG:		/* Read MII PHY register. */
+		spin_lock_irqsave(&cp->lock, flags);
+		cas_mif_poll(cp, 0);
+		data->val_out = cas_phy_read(cp, data->reg_num & 0x1f);
+		cas_mif_poll(cp, 1);
+		spin_unlock_irqrestore(&cp->lock, flags);
+		rc = 0;
+		break;
+
+	case SIOCSMIIREG:		/* Write MII PHY register. */
+		if (!capable(CAP_NET_ADMIN)) {
+			rc = -EPERM;
+			break;
+		}
+		spin_lock_irqsave(&cp->lock, flags);
+		cas_mif_poll(cp, 0);
+		rc = cas_phy_write(cp, data->reg_num & 0x1f, data->val_in);
+		cas_mif_poll(cp, 1);
+		spin_unlock_irqrestore(&cp->lock, flags);
+		break;
+	default:
+		break;
+	};
+
+	up(&cp->pm_sem);
+	return rc;
+}
+
+static int __devinit cas_init_one(struct pci_dev *pdev,
+				  const struct pci_device_id *ent)
+{
+	static int cas_version_printed = 0;
+	unsigned long casreg_base, casreg_len;
+	struct net_device *dev;
+	struct cas *cp;
+	int i, err, pci_using_dac;
+	u16 pci_cmd;
+	u8 orig_cacheline_size = 0, cas_cacheline_size = 0;
+
+	if (cas_version_printed++ == 0)
+		printk(KERN_INFO "%s", version);
+
+	err = pci_enable_device(pdev);
+	if (err) {
+		printk(KERN_ERR PFX "Cannot enable PCI device, "
+		       "aborting.\n");
+		return err;
+	}
+
+	if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
+		printk(KERN_ERR PFX "Cannot find proper PCI device "
+		       "base address, aborting.\n");
+		err = -ENODEV;
+		goto err_out_disable_pdev;
+	}
+
+	dev = alloc_etherdev(sizeof(*cp));
+	if (!dev) {
+		printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
+		err = -ENOMEM;
+		goto err_out_disable_pdev;
+	}
+	SET_MODULE_OWNER(dev);
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	err = pci_request_regions(pdev, dev->name);
+	if (err) {
+		printk(KERN_ERR PFX "Cannot obtain PCI resources, "
+		       "aborting.\n");
+		goto err_out_free_netdev;
+	}
+	pci_set_master(pdev);
+
+	/* we must always turn on parity response or else parity
+	 * doesn't get generated properly. disable SERR/PERR as well.
+	 * in addition, we want to turn MWI on.
+	 */
+	pci_read_config_word(pdev, PCI_COMMAND, &pci_cmd);
+	pci_cmd &= ~PCI_COMMAND_SERR;
+	pci_cmd |= PCI_COMMAND_PARITY;
+	pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
+	pci_set_mwi(pdev);
+	/*
+	 * On some architectures, the default cache line size set
+	 * by pci_set_mwi reduces perforamnce.  We have to increase
+	 * it for this case.  To start, we'll print some configuration
+	 * data.
+	 */
+#if 1
+	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE,
+			     &orig_cacheline_size);
+	if (orig_cacheline_size < CAS_PREF_CACHELINE_SIZE) {
+		cas_cacheline_size = 
+			(CAS_PREF_CACHELINE_SIZE < SMP_CACHE_BYTES) ? 
+			CAS_PREF_CACHELINE_SIZE : SMP_CACHE_BYTES;
+		if (pci_write_config_byte(pdev, 
+					  PCI_CACHE_LINE_SIZE, 
+					  cas_cacheline_size)) {
+			printk(KERN_ERR PFX "Could not set PCI cache "
+			       "line size\n");
+			goto err_write_cacheline;
+		}
+	}
+#endif
+
+
+	/* Configure DMA attributes. */
+	if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
+		pci_using_dac = 1;
+		err = pci_set_consistent_dma_mask(pdev,
+						  DMA_64BIT_MASK);
+		if (err < 0) {
+			printk(KERN_ERR PFX "Unable to obtain 64-bit DMA "
+			       "for consistent allocations\n");
+			goto err_out_free_res;
+		}
+
+	} else {
+		err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+		if (err) {
+			printk(KERN_ERR PFX "No usable DMA configuration, "
+			       "aborting.\n");
+			goto err_out_free_res;
+		}
+		pci_using_dac = 0;
+	}
+
+	casreg_base = pci_resource_start(pdev, 0);
+	casreg_len = pci_resource_len(pdev, 0);
+
+	cp = netdev_priv(dev);
+	cp->pdev = pdev;
+#if 1
+	/* A value of 0 indicates we never explicitly set it */
+	cp->orig_cacheline_size = cas_cacheline_size ? orig_cacheline_size: 0;
+#endif
+	cp->dev = dev;
+	cp->msg_enable = (cassini_debug < 0) ? CAS_DEF_MSG_ENABLE : 
+	  cassini_debug;
+
+	cp->link_transition = LINK_TRANSITION_UNKNOWN;
+	cp->link_transition_jiffies_valid = 0;
+
+	spin_lock_init(&cp->lock);
+	spin_lock_init(&cp->rx_inuse_lock);
+	spin_lock_init(&cp->rx_spare_lock);
+	for (i = 0; i < N_TX_RINGS; i++) {
+		spin_lock_init(&cp->stat_lock[i]);
+		spin_lock_init(&cp->tx_lock[i]);
+	}
+	spin_lock_init(&cp->stat_lock[N_TX_RINGS]);
+	init_MUTEX(&cp->pm_sem);
+
+	init_timer(&cp->link_timer);
+	cp->link_timer.function = cas_link_timer;
+	cp->link_timer.data = (unsigned long) cp;
+
+#if 1
+	/* Just in case the implementation of atomic operations
+	 * change so that an explicit initialization is necessary.
+	 */
+	atomic_set(&cp->reset_task_pending, 0);
+	atomic_set(&cp->reset_task_pending_all, 0);
+	atomic_set(&cp->reset_task_pending_spare, 0);
+	atomic_set(&cp->reset_task_pending_mtu, 0);
+#endif
+	INIT_WORK(&cp->reset_task, cas_reset_task, cp);
+
+	/* Default link parameters */
+	if (link_mode >= 0 && link_mode <= 6)
+		cp->link_cntl = link_modes[link_mode];
+	else
+		cp->link_cntl = BMCR_ANENABLE;
+	cp->lstate = link_down;
+	cp->link_transition = LINK_TRANSITION_LINK_DOWN;
+	netif_carrier_off(cp->dev);
+	cp->timer_ticks = 0;
+
+	/* give us access to cassini registers */
+	cp->regs = ioremap(casreg_base, casreg_len);
+	if (cp->regs == 0UL) {
+		printk(KERN_ERR PFX "Cannot map device registers, "
+		       "aborting.\n");
+		goto err_out_free_res;
+	}
+	cp->casreg_len = casreg_len;
+
+	pci_save_state(pdev);
+	cas_check_pci_invariants(cp);
+	cas_hard_reset(cp);
+	cas_reset(cp, 0);
+	if (cas_check_invariants(cp))
+		goto err_out_iounmap;
+
+	cp->init_block = (struct cas_init_block *)
+		pci_alloc_consistent(pdev, sizeof(struct cas_init_block),
+				     &cp->block_dvma);
+	if (!cp->init_block) {
+		printk(KERN_ERR PFX "Cannot allocate init block, "
+		       "aborting.\n");
+		goto err_out_iounmap;
+	}
+
+	for (i = 0; i < N_TX_RINGS; i++) 
+		cp->init_txds[i] = cp->init_block->txds[i];
+
+	for (i = 0; i < N_RX_DESC_RINGS; i++) 
+		cp->init_rxds[i] = cp->init_block->rxds[i];
+
+	for (i = 0; i < N_RX_COMP_RINGS; i++) 
+		cp->init_rxcs[i] = cp->init_block->rxcs[i];
+
+	for (i = 0; i < N_RX_FLOWS; i++)
+		skb_queue_head_init(&cp->rx_flows[i]);
+
+	dev->open = cas_open;
+	dev->stop = cas_close;
+	dev->hard_start_xmit = cas_start_xmit;
+	dev->get_stats = cas_get_stats;
+	dev->set_multicast_list = cas_set_multicast;
+	dev->do_ioctl = cas_ioctl;
+	dev->tx_timeout = cas_tx_timeout;
+	dev->watchdog_timeo = CAS_TX_TIMEOUT;
+	dev->change_mtu = cas_change_mtu;
+#ifdef USE_NAPI
+	dev->poll = cas_poll;
+	dev->weight = 64;
+#endif
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = cas_netpoll;
+#endif
+	dev->irq = pdev->irq;
+	dev->dma = 0;
+
+	/* Cassini features. */
+	if ((cp->cas_flags & CAS_FLAG_NO_HW_CSUM) == 0)
+		dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
+
+	if (pci_using_dac)
+		dev->features |= NETIF_F_HIGHDMA;
+
+	if (register_netdev(dev)) {
+		printk(KERN_ERR PFX "Cannot register net device, "
+		       "aborting.\n");
+		goto err_out_free_consistent;
+	}
+
+	i = readl(cp->regs + REG_BIM_CFG);
+	printk(KERN_INFO "%s: Sun Cassini%s (%sbit/%sMHz PCI/%s) "
+	       "Ethernet[%d] ",  dev->name, 
+	       (cp->cas_flags & CAS_FLAG_REG_PLUS) ? "+" : "", 
+	       (i & BIM_CFG_32BIT) ? "32" : "64",
+	       (i & BIM_CFG_66MHZ) ? "66" : "33",
+	       (cp->phy_type == CAS_PHY_SERDES) ? "Fi" : "Cu", pdev->irq); 
+
+	for (i = 0; i < 6; i++)
+		printk("%2.2x%c", dev->dev_addr[i],
+		       i == 5 ? ' ' : ':');
+	printk("\n");
+
+	pci_set_drvdata(pdev, dev);
+	cp->hw_running = 1;
+	cas_entropy_reset(cp);
+	cas_phy_init(cp);
+	cas_begin_auto_negotiation(cp, NULL);
+	return 0;
+
+err_out_free_consistent:
+	pci_free_consistent(pdev, sizeof(struct cas_init_block),
+			    cp->init_block, cp->block_dvma);
+
+err_out_iounmap:
+	down(&cp->pm_sem);
+	if (cp->hw_running)
+		cas_shutdown(cp);
+	up(&cp->pm_sem);
+
+	iounmap((void *) cp->regs);
+
+
+err_out_free_res:
+	pci_release_regions(pdev);
+
+err_write_cacheline:
+	/* Try to restore it in case the error occured after we
+	 * set it. 
+	 */
+	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, orig_cacheline_size);
+
+err_out_free_netdev:
+	free_netdev(dev);
+
+err_out_disable_pdev:
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+	return -ENODEV;
+}
+
+static void __devexit cas_remove_one(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct cas *cp;
+	if (!dev)
+		return;
+
+	cp = netdev_priv(dev);
+	unregister_netdev(dev);
+
+	down(&cp->pm_sem);
+	flush_scheduled_work();
+	if (cp->hw_running)
+		cas_shutdown(cp);
+	up(&cp->pm_sem);
+
+#if 1
+	if (cp->orig_cacheline_size) {
+		/* Restore the cache line size if we had modified
+		 * it.
+		 */
+		pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 
+				      cp->orig_cacheline_size);
+	}
+#endif
+	pci_free_consistent(pdev, sizeof(struct cas_init_block),
+			    cp->init_block, cp->block_dvma);
+	iounmap((void *) cp->regs);
+	free_netdev(dev);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+}
+
+#ifdef CONFIG_PM
+static int cas_suspend(struct pci_dev *pdev, u32 state)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct cas *cp = netdev_priv(dev);
+	unsigned long flags;
+
+	/* We hold the PM semaphore during entire driver
+	 * sleep time
+	 */
+	down(&cp->pm_sem);
+	
+	/* If the driver is opened, we stop the DMA */
+	if (cp->opened) {
+		netif_device_detach(dev);
+
+		cas_lock_all_save(cp, flags);
+
+		/* We can set the second arg of cas_reset to 0
+		 * because on resume, we'll call cas_init_hw with
+		 * its second arg set so that autonegotiation is
+		 * restarted.
+		 */
+		cas_reset(cp, 0);
+		cas_clean_rings(cp);
+		cas_unlock_all_restore(cp, flags);
+	}
+
+	if (cp->hw_running)
+		cas_shutdown(cp);
+
+	return 0;
+}
+
+static int cas_resume(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct cas *cp = netdev_priv(dev);
+
+	printk(KERN_INFO "%s: resuming\n", dev->name);
+
+	cas_hard_reset(cp);
+	if (cp->opened) {
+		unsigned long flags;
+		cas_lock_all_save(cp, flags);
+		cas_reset(cp, 0);
+		cp->hw_running = 1;
+		cas_clean_rings(cp);
+		cas_init_hw(cp, 1);
+		cas_unlock_all_restore(cp, flags);
+
+		netif_device_attach(dev);
+	}
+	up(&cp->pm_sem);
+	return 0;
+}
+#endif /* CONFIG_PM */
+
+static struct pci_driver cas_driver = {
+	.name		= DRV_MODULE_NAME,
+	.id_table	= cas_pci_tbl,
+	.probe		= cas_init_one,
+	.remove		= __devexit_p(cas_remove_one),
+#ifdef CONFIG_PM
+	.suspend	= cas_suspend,
+	.resume		= cas_resume
+#endif
+};
+
+static int __init cas_init(void)
+{
+	if (linkdown_timeout > 0)
+		link_transition_timeout = linkdown_timeout * HZ;
+	else
+		link_transition_timeout = 0;
+
+	return pci_module_init(&cas_driver);
+}
+
+static void __exit cas_cleanup(void)
+{
+	pci_unregister_driver(&cas_driver);
+}
+
+module_init(cas_init);
+module_exit(cas_cleanup);