1 files changed, 2222 insertions, 0 deletions

diff --git a/drivers/net/ns83820.c b/drivers/net/ns83820.c
new file mode 100644
index 000000000000..2fcc181a8624
--- /dev/null
+++ b/drivers/net/ns83820.c
@@ -0,0 +1,2222 @@
+#define _VERSION "0.20"
+/* ns83820.c by Benjamin LaHaise with contributions.
+ *
+ * Questions/comments/discussion to linux-ns83820@kvack.org.
+ *
+ * $Revision: 1.34.2.23 $
+ *
+ * Copyright 2001 Benjamin LaHaise.
+ * Copyright 2001, 2002 Red Hat.
+ *
+ * Mmmm, chocolate vanilla mocha...
+ *
+ *
+ * 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
+ *
+ *
+ * ChangeLog
+ * =========
+ *      20010414        0.1 - created
+ *      20010622        0.2 - basic rx and tx.
+ *      20010711        0.3 - added duplex and link state detection support.
+ *      20010713        0.4 - zero copy, no hangs.
+ *                      0.5 - 64 bit dma support (davem will hate me for this)
+ *                          - disable jumbo frames to avoid tx hangs
+ *                          - work around tx deadlocks on my 1.02 card via
+ *                            fiddling with TXCFG
+ *      20010810        0.6 - use pci dma api for ringbuffers, work on ia64
+ *      20010816        0.7 - misc cleanups
+ *      20010826        0.8 - fix critical zero copy bugs
+ *                      0.9 - internal experiment
+ *      20010827        0.10 - fix ia64 unaligned access.
+ *      20010906        0.11 - accept all packets with checksum errors as
+ *                             otherwise fragments get lost
+ *                           - fix >> 32 bugs
+ *                      0.12 - add statistics counters
+ *                           - add allmulti/promisc support
+ *      20011009        0.13 - hotplug support, other smaller pci api cleanups
+ *      20011204        0.13a - optical transceiver support added
+ *                              by Michael Clark <michael@metaparadigm.com>
+ *      20011205        0.13b - call register_netdev earlier in initialization
+ *                              suppress duplicate link status messages
+ *      20011117        0.14 - ethtool GDRVINFO, GLINK support from jgarzik
+ *      20011204        0.15    get ppc (big endian) working
+ *      20011218        0.16    various cleanups
+ *      20020310        0.17    speedups
+ *      20020610        0.18 -  actually use the pci dma api for highmem
+ *                           -  remove pci latency register fiddling
+ *                      0.19 -  better bist support
+ *                           -  add ihr and reset_phy parameters
+ *                           -  gmii bus probing
+ *                           -  fix missed txok introduced during performance
+ *                              tuning
+ *                      0.20 -  fix stupid RFEN thinko.  i am such a smurf.
+ *
+ *      20040828        0.21 -  add hardware vlan accleration
+ *                              by Neil Horman <nhorman@redhat.com>
+ * Driver Overview
+ * ===============
+ *
+ * This driver was originally written for the National Semiconductor
+ * 83820 chip, a 10/100/1000 Mbps 64 bit PCI ethernet NIC.  Hopefully
+ * this code will turn out to be a) clean, b) correct, and c) fast.
+ * With that in mind, I'm aiming to split the code up as much as
+ * reasonably possible.  At present there are X major sections that
+ * break down into a) packet receive, b) packet transmit, c) link
+ * management, d) initialization and configuration.  Where possible,
+ * these code paths are designed to run in parallel.
+ *
+ * This driver has been tested and found to work with the following
+ * cards (in no particular order):
+ *
+ *      Cameo           SOHO-GA2000T    SOHO-GA2500T
+ *      D-Link          DGE-500T
+ *      PureData        PDP8023Z-TG
+ *      SMC             SMC9452TX       SMC9462TX
+ *      Netgear         GA621
+ *
+ * Special thanks to SMC for providing hardware to test this driver on.
+ *
+ * Reports of success or failure would be greatly appreciated.
+ */
+//#define dprintk               printk
+#define dprintk(x...)           do { } while (0)
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+#include <linux/smp_lock.h>
+#include <linux/workqueue.h>
+#include <linux/init.h>
+#include <linux/ip.h>   /* for iph */
+#include <linux/in.h>   /* for IPPROTO_... */
+#include <linux/eeprom.h>
+#include <linux/compiler.h>
+#include <linux/prefetch.h>
+#include <linux/ethtool.h>
+#include <linux/timer.h>
+#include <linux/if_vlan.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#define DRV_NAME "ns83820"
+
+/* Global parameters.  See module_param near the bottom. */
+static int ihr = 2;
+static int reset_phy = 0;
+static int lnksts = 0;          /* CFG_LNKSTS bit polarity */
+
+/* Dprintk is used for more interesting debug events */
+#undef Dprintk
+#define Dprintk                 dprintk
+
+#if defined(CONFIG_HIGHMEM64G) || defined(__ia64__)
+#define USE_64BIT_ADDR  "+"
+#endif
+
+#if defined(USE_64BIT_ADDR)
+#define VERSION _VERSION USE_64BIT_ADDR
+#define TRY_DAC 1
+#else
+#define VERSION _VERSION
+#define TRY_DAC 0
+#endif
+
+/* tunables */
+#define RX_BUF_SIZE     1500    /* 8192 */
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#define NS83820_VLAN_ACCEL_SUPPORT
+#endif
+
+/* Must not exceed ~65000. */
+#define NR_RX_DESC      64
+#define NR_TX_DESC      128
+
+/* not tunable */
+#define REAL_RX_BUF_SIZE (RX_BUF_SIZE + 14)     /* rx/tx mac addr + type */
+
+#define MIN_TX_DESC_FREE        8
+
+/* register defines */
+#define CFGCS           0x04
+
+#define CR_TXE          0x00000001
+#define CR_TXD          0x00000002
+/* Ramit : Here's a tip, don't do a RXD immediately followed by an RXE
+ * The Receive engine skips one descriptor and moves
+ * onto the next one!! */
+#define CR_RXE          0x00000004
+#define CR_RXD          0x00000008
+#define CR_TXR          0x00000010
+#define CR_RXR          0x00000020
+#define CR_SWI          0x00000080
+#define CR_RST          0x00000100
+
+#define PTSCR_EEBIST_FAIL       0x00000001
+#define PTSCR_EEBIST_EN         0x00000002
+#define PTSCR_EELOAD_EN         0x00000004
+#define PTSCR_RBIST_FAIL        0x000001b8
+#define PTSCR_RBIST_DONE        0x00000200
+#define PTSCR_RBIST_EN          0x00000400
+#define PTSCR_RBIST_RST         0x00002000
+
+#define MEAR_EEDI               0x00000001
+#define MEAR_EEDO               0x00000002
+#define MEAR_EECLK              0x00000004
+#define MEAR_EESEL              0x00000008
+#define MEAR_MDIO               0x00000010
+#define MEAR_MDDIR              0x00000020
+#define MEAR_MDC                0x00000040
+
+#define ISR_TXDESC3     0x40000000
+#define ISR_TXDESC2     0x20000000
+#define ISR_TXDESC1     0x10000000
+#define ISR_TXDESC0     0x08000000
+#define ISR_RXDESC3     0x04000000
+#define ISR_RXDESC2     0x02000000
+#define ISR_RXDESC1     0x01000000
+#define ISR_RXDESC0     0x00800000
+#define ISR_TXRCMP      0x00400000
+#define ISR_RXRCMP      0x00200000
+#define ISR_DPERR       0x00100000
+#define ISR_SSERR       0x00080000
+#define ISR_RMABT       0x00040000
+#define ISR_RTABT       0x00020000
+#define ISR_RXSOVR      0x00010000
+#define ISR_HIBINT      0x00008000
+#define ISR_PHY         0x00004000
+#define ISR_PME         0x00002000
+#define ISR_SWI         0x00001000
+#define ISR_MIB         0x00000800
+#define ISR_TXURN       0x00000400
+#define ISR_TXIDLE      0x00000200
+#define ISR_TXERR       0x00000100
+#define ISR_TXDESC      0x00000080
+#define ISR_TXOK        0x00000040
+#define ISR_RXORN       0x00000020
+#define ISR_RXIDLE      0x00000010
+#define ISR_RXEARLY     0x00000008
+#define ISR_RXERR       0x00000004
+#define ISR_RXDESC      0x00000002
+#define ISR_RXOK        0x00000001
+
+#define TXCFG_CSI       0x80000000
+#define TXCFG_HBI       0x40000000
+#define TXCFG_MLB       0x20000000
+#define TXCFG_ATP       0x10000000
+#define TXCFG_ECRETRY   0x00800000
+#define TXCFG_BRST_DIS  0x00080000
+#define TXCFG_MXDMA1024 0x00000000
+#define TXCFG_MXDMA512  0x00700000
+#define TXCFG_MXDMA256  0x00600000
+#define TXCFG_MXDMA128  0x00500000
+#define TXCFG_MXDMA64   0x00400000
+#define TXCFG_MXDMA32   0x00300000
+#define TXCFG_MXDMA16   0x00200000
+#define TXCFG_MXDMA8    0x00100000
+
+#define CFG_LNKSTS      0x80000000
+#define CFG_SPDSTS      0x60000000
+#define CFG_SPDSTS1     0x40000000
+#define CFG_SPDSTS0     0x20000000
+#define CFG_DUPSTS      0x10000000
+#define CFG_TBI_EN      0x01000000
+#define CFG_MODE_1000   0x00400000
+/* Ramit : Dont' ever use AUTO_1000, it never works and is buggy.
+ * Read the Phy response and then configure the MAC accordingly */
+#define CFG_AUTO_1000   0x00200000
+#define CFG_PINT_CTL    0x001c0000
+#define CFG_PINT_DUPSTS 0x00100000
+#define CFG_PINT_LNKSTS 0x00080000
+#define CFG_PINT_SPDSTS 0x00040000
+#define CFG_TMRTEST     0x00020000
+#define CFG_MRM_DIS     0x00010000
+#define CFG_MWI_DIS     0x00008000
+#define CFG_T64ADDR     0x00004000
+#define CFG_PCI64_DET   0x00002000
+#define CFG_DATA64_EN   0x00001000
+#define CFG_M64ADDR     0x00000800
+#define CFG_PHY_RST     0x00000400
+#define CFG_PHY_DIS     0x00000200
+#define CFG_EXTSTS_EN   0x00000100
+#define CFG_REQALG      0x00000080
+#define CFG_SB          0x00000040
+#define CFG_POW         0x00000020
+#define CFG_EXD         0x00000010
+#define CFG_PESEL       0x00000008
+#define CFG_BROM_DIS    0x00000004
+#define CFG_EXT_125     0x00000002
+#define CFG_BEM         0x00000001
+
+#define EXTSTS_UDPPKT   0x00200000
+#define EXTSTS_TCPPKT   0x00080000
+#define EXTSTS_IPPKT    0x00020000
+#define EXTSTS_VPKT     0x00010000
+#define EXTSTS_VTG_MASK 0x0000ffff
+
+#define SPDSTS_POLARITY (CFG_SPDSTS1 | CFG_SPDSTS0 | CFG_DUPSTS | (lnksts ? CFG_LNKSTS : 0))
+
+#define MIBC_MIBS       0x00000008
+#define MIBC_ACLR       0x00000004
+#define MIBC_FRZ        0x00000002
+#define MIBC_WRN        0x00000001
+
+#define PCR_PSEN        (1 << 31)
+#define PCR_PS_MCAST    (1 << 30)
+#define PCR_PS_DA       (1 << 29)
+#define PCR_STHI_8      (3 << 23)
+#define PCR_STLO_4      (1 << 23)
+#define PCR_FFHI_8K     (3 << 21)
+#define PCR_FFLO_4K     (1 << 21)
+#define PCR_PAUSE_CNT   0xFFFE
+
+#define RXCFG_AEP       0x80000000
+#define RXCFG_ARP       0x40000000
+#define RXCFG_STRIPCRC  0x20000000
+#define RXCFG_RX_FD     0x10000000
+#define RXCFG_ALP       0x08000000
+#define RXCFG_AIRL      0x04000000
+#define RXCFG_MXDMA512  0x00700000
+#define RXCFG_DRTH      0x0000003e
+#define RXCFG_DRTH0     0x00000002
+
+#define RFCR_RFEN       0x80000000
+#define RFCR_AAB        0x40000000
+#define RFCR_AAM        0x20000000
+#define RFCR_AAU        0x10000000
+#define RFCR_APM        0x08000000
+#define RFCR_APAT       0x07800000
+#define RFCR_APAT3      0x04000000
+#define RFCR_APAT2      0x02000000
+#define RFCR_APAT1      0x01000000
+#define RFCR_APAT0      0x00800000
+#define RFCR_AARP       0x00400000
+#define RFCR_MHEN       0x00200000
+#define RFCR_UHEN       0x00100000
+#define RFCR_ULM        0x00080000
+
+#define VRCR_RUDPE      0x00000080
+#define VRCR_RTCPE      0x00000040
+#define VRCR_RIPE       0x00000020
+#define VRCR_IPEN       0x00000010
+#define VRCR_DUTF       0x00000008
+#define VRCR_DVTF       0x00000004
+#define VRCR_VTREN      0x00000002
+#define VRCR_VTDEN      0x00000001
+
+#define VTCR_PPCHK      0x00000008
+#define VTCR_GCHK       0x00000004
+#define VTCR_VPPTI      0x00000002
+#define VTCR_VGTI       0x00000001
+
+#define CR              0x00
+#define CFG             0x04
+#define MEAR            0x08
+#define PTSCR           0x0c
+#define ISR             0x10
+#define IMR             0x14
+#define IER             0x18
+#define IHR             0x1c
+#define TXDP            0x20
+#define TXDP_HI         0x24
+#define TXCFG           0x28
+#define GPIOR           0x2c
+#define RXDP            0x30
+#define RXDP_HI         0x34
+#define RXCFG           0x38
+#define PQCR            0x3c
+#define WCSR            0x40
+#define PCR             0x44
+#define RFCR            0x48
+#define RFDR            0x4c
+
+#define SRR             0x58
+
+#define VRCR            0xbc
+#define VTCR            0xc0
+#define VDR             0xc4
+#define CCSR            0xcc
+
+#define TBICR           0xe0
+#define TBISR           0xe4
+#define TANAR           0xe8
+#define TANLPAR         0xec
+#define TANER           0xf0
+#define TESR            0xf4
+
+#define TBICR_MR_AN_ENABLE      0x00001000
+#define TBICR_MR_RESTART_AN     0x00000200
+
+#define TBISR_MR_LINK_STATUS    0x00000020
+#define TBISR_MR_AN_COMPLETE    0x00000004
+
+#define TANAR_PS2               0x00000100
+#define TANAR_PS1               0x00000080
+#define TANAR_HALF_DUP          0x00000040
+#define TANAR_FULL_DUP          0x00000020
+
+#define GPIOR_GP5_OE            0x00000200
+#define GPIOR_GP4_OE            0x00000100
+#define GPIOR_GP3_OE            0x00000080
+#define GPIOR_GP2_OE            0x00000040
+#define GPIOR_GP1_OE            0x00000020
+#define GPIOR_GP3_OUT           0x00000004
+#define GPIOR_GP1_OUT           0x00000001
+
+#define LINK_AUTONEGOTIATE      0x01
+#define LINK_DOWN               0x02
+#define LINK_UP                 0x04
+
+#ifdef USE_64BIT_ADDR
+#define HW_ADDR_LEN     8
+#define desc_addr_set(desc, addr)                               \
+        do {                                                    \
+                u64 __addr = (addr);                            \
+                (desc)[0] = cpu_to_le32(__addr);                \
+                (desc)[1] = cpu_to_le32(__addr >> 32);          \
+        } while(0)
+#define desc_addr_get(desc)                                     \
+                (((u64)le32_to_cpu((desc)[1]) << 32)            \
+                     | le32_to_cpu((desc)[0]))
+#else
+#define HW_ADDR_LEN     4
+#define desc_addr_set(desc, addr)       ((desc)[0] = cpu_to_le32(addr))
+#define desc_addr_get(desc)             (le32_to_cpu((desc)[0]))
+#endif
+
+#define DESC_LINK               0
+#define DESC_BUFPTR             (DESC_LINK + HW_ADDR_LEN/4)
+#define DESC_CMDSTS             (DESC_BUFPTR + HW_ADDR_LEN/4)
+#define DESC_EXTSTS             (DESC_CMDSTS + 4/4)
+
+#define CMDSTS_OWN      0x80000000
+#define CMDSTS_MORE     0x40000000
+#define CMDSTS_INTR     0x20000000
+#define CMDSTS_ERR      0x10000000
+#define CMDSTS_OK       0x08000000
+#define CMDSTS_RUNT     0x00200000
+#define CMDSTS_LEN_MASK 0x0000ffff
+
+#define CMDSTS_DEST_MASK        0x01800000
+#define CMDSTS_DEST_SELF        0x00800000
+#define CMDSTS_DEST_MULTI       0x01000000
+
+#define DESC_SIZE       8               /* Should be cache line sized */
+
+struct rx_info {
+        spinlock_t      lock;
+        int             up;
+        long            idle;
+
+        struct sk_buff  *skbs[NR_RX_DESC];
+
+        u32             *next_rx_desc;
+        u16             next_rx, next_empty;
+
+        u32             *descs;
+        dma_addr_t      phy_descs;
+};
+
+
+struct ns83820 {
+        struct net_device_stats stats;
+        u8                      __iomem *base;
+
+        struct pci_dev          *pci_dev;
+
+#ifdef NS83820_VLAN_ACCEL_SUPPORT
+        struct vlan_group       *vlgrp;
+#endif
+
+        struct rx_info          rx_info;
+        struct tasklet_struct   rx_tasklet;
+
+        unsigned                ihr;
+        struct work_struct      tq_refill;
+
+        /* protects everything below.  irqsave when using. */
+        spinlock_t              misc_lock;
+
+        u32                     CFG_cache;
+
+        u32                     MEAR_cache;
+        u32                     IMR_cache;
+        struct eeprom           ee;
+
+        unsigned                linkstate;
+
+        spinlock_t      tx_lock;
+
+        u16             tx_done_idx;
+        u16             tx_idx;
+        volatile u16    tx_free_idx;    /* idx of free desc chain */
+        u16             tx_intr_idx;
+
+        atomic_t        nr_tx_skbs;
+        struct sk_buff  *tx_skbs[NR_TX_DESC];
+
+        char            pad[16] __attribute__((aligned(16)));
+        u32             *tx_descs;
+        dma_addr_t      tx_phy_descs;
+
+        struct timer_list       tx_watchdog;
+};
+
+static inline struct ns83820 *PRIV(struct net_device *dev)
+{
+        return netdev_priv(dev);
+}
+
+#define __kick_rx(dev)  writel(CR_RXE, dev->base + CR)
+
+static inline void kick_rx(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        dprintk("kick_rx: maybe kicking\n");
+        if (test_and_clear_bit(0, &dev->rx_info.idle)) {
+                dprintk("actually kicking\n");
+                writel(dev->rx_info.phy_descs +
+                        (4 * DESC_SIZE * dev->rx_info.next_rx),
+                       dev->base + RXDP);
+                if (dev->rx_info.next_rx == dev->rx_info.next_empty)
+                        printk(KERN_DEBUG "%s: uh-oh: next_rx == next_empty???\n",
+                                ndev->name);
+                __kick_rx(dev);
+        }
+}
+
+//free = (tx_done_idx + NR_TX_DESC-2 - free_idx) % NR_TX_DESC
+#define start_tx_okay(dev)      \
+        (((NR_TX_DESC-2 + dev->tx_done_idx - dev->tx_free_idx) % NR_TX_DESC) > MIN_TX_DESC_FREE)
+
+
+#ifdef NS83820_VLAN_ACCEL_SUPPORT 
+static void ns83820_vlan_rx_register(struct net_device *ndev, struct vlan_group *grp)
+{
+        struct ns83820 *dev = PRIV(ndev);
+
+        spin_lock_irq(&dev->misc_lock);
+        spin_lock(&dev->tx_lock);
+
+        dev->vlgrp = grp;
+
+        spin_unlock(&dev->tx_lock);
+        spin_unlock_irq(&dev->misc_lock);
+}
+
+static void ns83820_vlan_rx_kill_vid(struct net_device *ndev, unsigned short vid)
+{
+        struct ns83820 *dev = PRIV(ndev);
+
+        spin_lock_irq(&dev->misc_lock);
+        spin_lock(&dev->tx_lock);
+        if (dev->vlgrp)
+                dev->vlgrp->vlan_devices[vid] = NULL;
+        spin_unlock(&dev->tx_lock);
+        spin_unlock_irq(&dev->misc_lock);
+}
+#endif
+
+/* Packet Receiver
+ *
+ * The hardware supports linked lists of receive descriptors for
+ * which ownership is transfered back and forth by means of an
+ * ownership bit.  While the hardware does support the use of a
+ * ring for receive descriptors, we only make use of a chain in
+ * an attempt to reduce bus traffic under heavy load scenarios.
+ * This will also make bugs a bit more obvious.  The current code
+ * only makes use of a single rx chain; I hope to implement
+ * priority based rx for version 1.0.  Goal: even under overload
+ * conditions, still route realtime traffic with as low jitter as
+ * possible.
+ */
+static inline void build_rx_desc(struct ns83820 *dev, u32 *desc, dma_addr_t link, dma_addr_t buf, u32 cmdsts, u32 extsts)
+{
+        desc_addr_set(desc + DESC_LINK, link);
+        desc_addr_set(desc + DESC_BUFPTR, buf);
+        desc[DESC_EXTSTS] = cpu_to_le32(extsts);
+        mb();
+        desc[DESC_CMDSTS] = cpu_to_le32(cmdsts);
+}
+
+#define nr_rx_empty(dev) ((NR_RX_DESC-2 + dev->rx_info.next_rx - dev->rx_info.next_empty) % NR_RX_DESC)
+static inline int ns83820_add_rx_skb(struct ns83820 *dev, struct sk_buff *skb)
+{
+        unsigned next_empty;
+        u32 cmdsts;
+        u32 *sg;
+        dma_addr_t buf;
+
+        next_empty = dev->rx_info.next_empty;
+
+        /* don't overrun last rx marker */
+        if (unlikely(nr_rx_empty(dev) <= 2)) {
+                kfree_skb(skb);
+                return 1;
+        }
+
+#if 0
+        dprintk("next_empty[%d] nr_used[%d] next_rx[%d]\n",
+                dev->rx_info.next_empty,
+                dev->rx_info.nr_used,
+                dev->rx_info.next_rx
+                );
+#endif
+
+        sg = dev->rx_info.descs + (next_empty * DESC_SIZE);
+        if (unlikely(NULL != dev->rx_info.skbs[next_empty]))
+                BUG();
+        dev->rx_info.skbs[next_empty] = skb;
+
+        dev->rx_info.next_empty = (next_empty + 1) % NR_RX_DESC;
+        cmdsts = REAL_RX_BUF_SIZE | CMDSTS_INTR;
+        buf = pci_map_single(dev->pci_dev, skb->tail,
+                             REAL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+        build_rx_desc(dev, sg, 0, buf, cmdsts, 0);
+        /* update link of previous rx */
+        if (likely(next_empty != dev->rx_info.next_rx))
+                dev->rx_info.descs[((NR_RX_DESC + next_empty - 1) % NR_RX_DESC) * DESC_SIZE] = cpu_to_le32(dev->rx_info.phy_descs + (next_empty * DESC_SIZE * 4));
+
+        return 0;
+}
+
+static inline int rx_refill(struct net_device *ndev, int gfp)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        unsigned i;
+        unsigned long flags = 0;
+
+        if (unlikely(nr_rx_empty(dev) <= 2))
+                return 0;
+
+        dprintk("rx_refill(%p)\n", ndev);
+        if (gfp == GFP_ATOMIC)
+                spin_lock_irqsave(&dev->rx_info.lock, flags);
+        for (i=0; i<NR_RX_DESC; i++) {
+                struct sk_buff *skb;
+                long res;
+                /* extra 16 bytes for alignment */
+                skb = __dev_alloc_skb(REAL_RX_BUF_SIZE+16, gfp);
+                if (unlikely(!skb))
+                        break;
+
+                res = (long)skb->tail & 0xf;
+                res = 0x10 - res;
+                res &= 0xf;
+                skb_reserve(skb, res);
+
+                skb->dev = ndev;
+                if (gfp != GFP_ATOMIC)
+                        spin_lock_irqsave(&dev->rx_info.lock, flags);
+                res = ns83820_add_rx_skb(dev, skb);
+                if (gfp != GFP_ATOMIC)
+                        spin_unlock_irqrestore(&dev->rx_info.lock, flags);
+                if (res) {
+                        i = 1;
+                        break;
+                }
+        }
+        if (gfp == GFP_ATOMIC)
+                spin_unlock_irqrestore(&dev->rx_info.lock, flags);
+
+        return i ? 0 : -ENOMEM;
+}
+
+static void FASTCALL(rx_refill_atomic(struct net_device *ndev));
+static void fastcall rx_refill_atomic(struct net_device *ndev)
+{
+        rx_refill(ndev, GFP_ATOMIC);
+}
+
+/* REFILL */
+static inline void queue_refill(void *_dev)
+{
+        struct net_device *ndev = _dev;
+        struct ns83820 *dev = PRIV(ndev);
+
+        rx_refill(ndev, GFP_KERNEL);
+        if (dev->rx_info.up)
+                kick_rx(ndev);
+}
+
+static inline void clear_rx_desc(struct ns83820 *dev, unsigned i)
+{
+        build_rx_desc(dev, dev->rx_info.descs + (DESC_SIZE * i), 0, 0, CMDSTS_OWN, 0);
+}
+
+static void FASTCALL(phy_intr(struct net_device *ndev));
+static void fastcall phy_intr(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        static char *speeds[] = { "10", "100", "1000", "1000(?)", "1000F" };
+        u32 cfg, new_cfg;
+        u32 tbisr, tanar, tanlpar;
+        int speed, fullduplex, newlinkstate;
+
+        cfg = readl(dev->base + CFG) ^ SPDSTS_POLARITY;
+
+        if (dev->CFG_cache & CFG_TBI_EN) {
+                /* we have an optical transceiver */
+                tbisr = readl(dev->base + TBISR);
+                tanar = readl(dev->base + TANAR);
+                tanlpar = readl(dev->base + TANLPAR);
+                dprintk("phy_intr: tbisr=%08x, tanar=%08x, tanlpar=%08x\n",
+                        tbisr, tanar, tanlpar);
+
+                if ( (fullduplex = (tanlpar & TANAR_FULL_DUP)
+                      && (tanar & TANAR_FULL_DUP)) ) {
+
+                        /* both of us are full duplex */
+                        writel(readl(dev->base + TXCFG)
+                               | TXCFG_CSI | TXCFG_HBI | TXCFG_ATP,
+                               dev->base + TXCFG);
+                        writel(readl(dev->base + RXCFG) | RXCFG_RX_FD,
+                               dev->base + RXCFG);
+                        /* Light up full duplex LED */
+                        writel(readl(dev->base + GPIOR) | GPIOR_GP1_OUT,
+                               dev->base + GPIOR);
+
+                } else if(((tanlpar & TANAR_HALF_DUP)
+                           && (tanar & TANAR_HALF_DUP))
+                        || ((tanlpar & TANAR_FULL_DUP)
+                            && (tanar & TANAR_HALF_DUP))
+                        || ((tanlpar & TANAR_HALF_DUP)
+                            && (tanar & TANAR_FULL_DUP))) {
+
+                        /* one or both of us are half duplex */
+                        writel((readl(dev->base + TXCFG)
+                                & ~(TXCFG_CSI | TXCFG_HBI)) | TXCFG_ATP,
+                               dev->base + TXCFG);
+                        writel(readl(dev->base + RXCFG) & ~RXCFG_RX_FD,
+                               dev->base + RXCFG);
+                        /* Turn off full duplex LED */
+                        writel(readl(dev->base + GPIOR) & ~GPIOR_GP1_OUT,
+                               dev->base + GPIOR);
+                }
+
+                speed = 4; /* 1000F */
+
+        } else {
+                /* we have a copper transceiver */
+                new_cfg = dev->CFG_cache & ~(CFG_SB | CFG_MODE_1000 | CFG_SPDSTS);
+
+                if (cfg & CFG_SPDSTS1)
+                        new_cfg |= CFG_MODE_1000;
+                else
+                        new_cfg &= ~CFG_MODE_1000;
+
+                speed = ((cfg / CFG_SPDSTS0) & 3);
+                fullduplex = (cfg & CFG_DUPSTS);
+
+                if (fullduplex)
+                        new_cfg |= CFG_SB;
+
+                if ((cfg & CFG_LNKSTS) &&
+                    ((new_cfg ^ dev->CFG_cache) & CFG_MODE_1000)) {
+                        writel(new_cfg, dev->base + CFG);
+                        dev->CFG_cache = new_cfg;
+                }
+
+                dev->CFG_cache &= ~CFG_SPDSTS;
+                dev->CFG_cache |= cfg & CFG_SPDSTS;
+        }
+
+        newlinkstate = (cfg & CFG_LNKSTS) ? LINK_UP : LINK_DOWN;
+
+        if (newlinkstate & LINK_UP
+            && dev->linkstate != newlinkstate) {
+                netif_start_queue(ndev);
+                netif_wake_queue(ndev);
+                printk(KERN_INFO "%s: link now %s mbps, %s duplex and up.\n",
+                        ndev->name,
+                        speeds[speed],
+                        fullduplex ? "full" : "half");
+        } else if (newlinkstate & LINK_DOWN
+                   && dev->linkstate != newlinkstate) {
+                netif_stop_queue(ndev);
+                printk(KERN_INFO "%s: link now down.\n", ndev->name);
+        }
+
+        dev->linkstate = newlinkstate;
+}
+
+static int ns83820_setup_rx(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        unsigned i;
+        int ret;
+
+        dprintk("ns83820_setup_rx(%p)\n", ndev);
+
+        dev->rx_info.idle = 1;
+        dev->rx_info.next_rx = 0;
+        dev->rx_info.next_rx_desc = dev->rx_info.descs;
+        dev->rx_info.next_empty = 0;
+
+        for (i=0; i<NR_RX_DESC; i++)
+                clear_rx_desc(dev, i);
+
+        writel(0, dev->base + RXDP_HI);
+        writel(dev->rx_info.phy_descs, dev->base + RXDP);
+
+        ret = rx_refill(ndev, GFP_KERNEL);
+        if (!ret) {
+                dprintk("starting receiver\n");
+                /* prevent the interrupt handler from stomping on us */
+                spin_lock_irq(&dev->rx_info.lock);
+
+                writel(0x0001, dev->base + CCSR);
+                writel(0, dev->base + RFCR);
+                writel(0x7fc00000, dev->base + RFCR);
+                writel(0xffc00000, dev->base + RFCR);
+
+                dev->rx_info.up = 1;
+
+                phy_intr(ndev);
+
+                /* Okay, let it rip */
+                spin_lock_irq(&dev->misc_lock);
+                dev->IMR_cache |= ISR_PHY;
+                dev->IMR_cache |= ISR_RXRCMP;
+                //dev->IMR_cache |= ISR_RXERR;
+                //dev->IMR_cache |= ISR_RXOK;
+                dev->IMR_cache |= ISR_RXORN;
+                dev->IMR_cache |= ISR_RXSOVR;
+                dev->IMR_cache |= ISR_RXDESC;
+                dev->IMR_cache |= ISR_RXIDLE;
+                dev->IMR_cache |= ISR_TXDESC;
+                dev->IMR_cache |= ISR_TXIDLE;
+
+                writel(dev->IMR_cache, dev->base + IMR);
+                writel(1, dev->base + IER);
+                spin_unlock_irq(&dev->misc_lock);
+
+                kick_rx(ndev);
+
+                spin_unlock_irq(&dev->rx_info.lock);
+        }
+        return ret;
+}
+
+static void ns83820_cleanup_rx(struct ns83820 *dev)
+{
+        unsigned i;
+        unsigned long flags;
+
+        dprintk("ns83820_cleanup_rx(%p)\n", dev);
+
+        /* disable receive interrupts */
+        spin_lock_irqsave(&dev->misc_lock, flags);
+        dev->IMR_cache &= ~(ISR_RXOK | ISR_RXDESC | ISR_RXERR | ISR_RXEARLY | ISR_RXIDLE);
+        writel(dev->IMR_cache, dev->base + IMR);
+        spin_unlock_irqrestore(&dev->misc_lock, flags);
+
+        /* synchronize with the interrupt handler and kill it */
+        dev->rx_info.up = 0;
+        synchronize_irq(dev->pci_dev->irq);
+
+        /* touch the pci bus... */
+        readl(dev->base + IMR);
+
+        /* assumes the transmitter is already disabled and reset */
+        writel(0, dev->base + RXDP_HI);
+        writel(0, dev->base + RXDP);
+
+        for (i=0; i<NR_RX_DESC; i++) {
+                struct sk_buff *skb = dev->rx_info.skbs[i];
+                dev->rx_info.skbs[i] = NULL;
+                clear_rx_desc(dev, i);
+                if (skb)
+                        kfree_skb(skb);
+        }
+}
+
+static void FASTCALL(ns83820_rx_kick(struct net_device *ndev));
+static void fastcall ns83820_rx_kick(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        /*if (nr_rx_empty(dev) >= NR_RX_DESC/4)*/ {
+                if (dev->rx_info.up) {
+                        rx_refill_atomic(ndev);
+                        kick_rx(ndev);
+                }
+        }
+
+        if (dev->rx_info.up && nr_rx_empty(dev) > NR_RX_DESC*3/4)
+                schedule_work(&dev->tq_refill);
+        else
+                kick_rx(ndev);
+        if (dev->rx_info.idle)
+                printk(KERN_DEBUG "%s: BAD\n", ndev->name);
+}
+
+/* rx_irq
+ *      
+ */
+static void FASTCALL(rx_irq(struct net_device *ndev));
+static void fastcall rx_irq(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        struct rx_info *info = &dev->rx_info;
+        unsigned next_rx;
+        int rx_rc, len;
+        u32 cmdsts, *desc;
+        unsigned long flags;
+        int nr = 0;
+
+        dprintk("rx_irq(%p)\n", ndev);
+        dprintk("rxdp: %08x, descs: %08lx next_rx[%d]: %p next_empty[%d]: %p\n",
+                readl(dev->base + RXDP),
+                (long)(dev->rx_info.phy_descs),
+                (int)dev->rx_info.next_rx,
+                (dev->rx_info.descs + (DESC_SIZE * dev->rx_info.next_rx)),
+                (int)dev->rx_info.next_empty,
+                (dev->rx_info.descs + (DESC_SIZE * dev->rx_info.next_empty))
+                );
+
+        spin_lock_irqsave(&info->lock, flags);
+        if (!info->up)
+                goto out;
+
+        dprintk("walking descs\n");
+        next_rx = info->next_rx;
+        desc = info->next_rx_desc;
+        while ((CMDSTS_OWN & (cmdsts = le32_to_cpu(desc[DESC_CMDSTS]))) &&
+               (cmdsts != CMDSTS_OWN)) {
+                struct sk_buff *skb;
+                u32 extsts = le32_to_cpu(desc[DESC_EXTSTS]);
+                dma_addr_t bufptr = desc_addr_get(desc + DESC_BUFPTR);
+
+                dprintk("cmdsts: %08x\n", cmdsts);
+                dprintk("link: %08x\n", cpu_to_le32(desc[DESC_LINK]));
+                dprintk("extsts: %08x\n", extsts);
+
+                skb = info->skbs[next_rx];
+                info->skbs[next_rx] = NULL;
+                info->next_rx = (next_rx + 1) % NR_RX_DESC;
+
+                mb();
+                clear_rx_desc(dev, next_rx);
+
+                pci_unmap_single(dev->pci_dev, bufptr,
+                                 RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+                len = cmdsts & CMDSTS_LEN_MASK;
+#ifdef NS83820_VLAN_ACCEL_SUPPORT
+                /* NH: As was mentioned below, this chip is kinda
+                 * brain dead about vlan tag stripping.  Frames
+                 * that are 64 bytes with a vlan header appended
+                 * like arp frames, or pings, are flagged as Runts
+                 * when the tag is stripped and hardware.  This
+                 * also means that the OK bit in the descriptor 
+                 * is cleared when the frame comes in so we have
+                 * to do a specific length check here to make sure
+                 * the frame would have been ok, had we not stripped
+                 * the tag.
+                 */ 
+                if (likely((CMDSTS_OK & cmdsts) ||
+                        ((cmdsts & CMDSTS_RUNT) && len >= 56))) {   
+#else
+                if (likely(CMDSTS_OK & cmdsts)) {
+#endif
+                        skb_put(skb, len);
+                        if (unlikely(!skb))
+                                goto netdev_mangle_me_harder_failed;
+                        if (cmdsts & CMDSTS_DEST_MULTI)
+                                dev->stats.multicast ++;
+                        dev->stats.rx_packets ++;
+                        dev->stats.rx_bytes += len;
+                        if ((extsts & 0x002a0000) && !(extsts & 0x00540000)) {
+                                skb->ip_summed = CHECKSUM_UNNECESSARY;
+                        } else {
+                                skb->ip_summed = CHECKSUM_NONE;
+                        }
+                        skb->protocol = eth_type_trans(skb, ndev);
+#ifdef NS83820_VLAN_ACCEL_SUPPORT 
+                        if(extsts & EXTSTS_VPKT) {
+                                unsigned short tag;
+                                tag = ntohs(extsts & EXTSTS_VTG_MASK);
+                                rx_rc = vlan_hwaccel_rx(skb,dev->vlgrp,tag);
+                        } else {
+                                rx_rc = netif_rx(skb);
+                        }
+#else
+                        rx_rc = netif_rx(skb);
+#endif
+                        if (NET_RX_DROP == rx_rc) {
+netdev_mangle_me_harder_failed:
+                                dev->stats.rx_dropped ++;
+                        }
+                } else {
+                        kfree_skb(skb);
+                }
+
+                nr++;
+                next_rx = info->next_rx;
+                desc = info->descs + (DESC_SIZE * next_rx);
+        }
+        info->next_rx = next_rx;
+        info->next_rx_desc = info->descs + (DESC_SIZE * next_rx);
+
+out:
+        if (0 && !nr) {
+                Dprintk("dazed: cmdsts_f: %08x\n", cmdsts);
+        }
+
+        spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static void rx_action(unsigned long _dev)
+{
+        struct net_device *ndev = (void *)_dev;
+        struct ns83820 *dev = PRIV(ndev);
+        rx_irq(ndev);
+        writel(ihr, dev->base + IHR);
+
+        spin_lock_irq(&dev->misc_lock);
+        dev->IMR_cache |= ISR_RXDESC;
+        writel(dev->IMR_cache, dev->base + IMR);
+        spin_unlock_irq(&dev->misc_lock);
+
+        rx_irq(ndev);
+        ns83820_rx_kick(ndev);
+}
+
+/* Packet Transmit code
+ */
+static inline void kick_tx(struct ns83820 *dev)
+{
+        dprintk("kick_tx(%p): tx_idx=%d free_idx=%d\n",
+                dev, dev->tx_idx, dev->tx_free_idx);
+        writel(CR_TXE, dev->base + CR);
+}
+
+/* No spinlock needed on the transmit irq path as the interrupt handler is
+ * serialized.
+ */
+static void do_tx_done(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        u32 cmdsts, tx_done_idx, *desc;
+
+        spin_lock_irq(&dev->tx_lock);
+
+        dprintk("do_tx_done(%p)\n", ndev);
+        tx_done_idx = dev->tx_done_idx;
+        desc = dev->tx_descs + (tx_done_idx * DESC_SIZE);
+
+        dprintk("tx_done_idx=%d free_idx=%d cmdsts=%08x\n",
+                tx_done_idx, dev->tx_free_idx, le32_to_cpu(desc[DESC_CMDSTS]));
+        while ((tx_done_idx != dev->tx_free_idx) &&
+               !(CMDSTS_OWN & (cmdsts = le32_to_cpu(desc[DESC_CMDSTS]))) ) {
+                struct sk_buff *skb;
+                unsigned len;
+                dma_addr_t addr;
+
+                if (cmdsts & CMDSTS_ERR)
+                        dev->stats.tx_errors ++;
+                if (cmdsts & CMDSTS_OK)
+                        dev->stats.tx_packets ++;
+                if (cmdsts & CMDSTS_OK)
+                        dev->stats.tx_bytes += cmdsts & 0xffff;
+
+                dprintk("tx_done_idx=%d free_idx=%d cmdsts=%08x\n",
+                        tx_done_idx, dev->tx_free_idx, cmdsts);
+                skb = dev->tx_skbs[tx_done_idx];
+                dev->tx_skbs[tx_done_idx] = NULL;
+                dprintk("done(%p)\n", skb);
+
+                len = cmdsts & CMDSTS_LEN_MASK;
+                addr = desc_addr_get(desc + DESC_BUFPTR);
+                if (skb) {
+                        pci_unmap_single(dev->pci_dev,
+                                        addr,
+                                        len,
+                                        PCI_DMA_TODEVICE);
+                        dev_kfree_skb_irq(skb);
+                        atomic_dec(&dev->nr_tx_skbs);
+                } else
+                        pci_unmap_page(dev->pci_dev, 
+                                        addr,
+                                        len,
+                                        PCI_DMA_TODEVICE);
+
+                tx_done_idx = (tx_done_idx + 1) % NR_TX_DESC;
+                dev->tx_done_idx = tx_done_idx;
+                desc[DESC_CMDSTS] = cpu_to_le32(0);
+                mb();
+                desc = dev->tx_descs + (tx_done_idx * DESC_SIZE);
+        }
+
+        /* Allow network stack to resume queueing packets after we've
+         * finished transmitting at least 1/4 of the packets in the queue.
+         */
+        if (netif_queue_stopped(ndev) && start_tx_okay(dev)) {
+                dprintk("start_queue(%p)\n", ndev);
+                netif_start_queue(ndev);
+                netif_wake_queue(ndev);
+        }
+        spin_unlock_irq(&dev->tx_lock);
+}
+
+static void ns83820_cleanup_tx(struct ns83820 *dev)
+{
+        unsigned i;
+
+        for (i=0; i<NR_TX_DESC; i++) {
+                struct sk_buff *skb = dev->tx_skbs[i];
+                dev->tx_skbs[i] = NULL;
+                if (skb) {
+                        u32 *desc = dev->tx_descs + (i * DESC_SIZE);
+                        pci_unmap_single(dev->pci_dev,
+                                        desc_addr_get(desc + DESC_BUFPTR),
+                                        le32_to_cpu(desc[DESC_CMDSTS]) & CMDSTS_LEN_MASK,
+                                        PCI_DMA_TODEVICE);
+                        dev_kfree_skb_irq(skb);
+                        atomic_dec(&dev->nr_tx_skbs);
+                }
+        }
+
+        memset(dev->tx_descs, 0, NR_TX_DESC * DESC_SIZE * 4);
+}
+
+/* transmit routine.  This code relies on the network layer serializing
+ * its calls in, but will run happily in parallel with the interrupt
+ * handler.  This code currently has provisions for fragmenting tx buffers
+ * while trying to track down a bug in either the zero copy code or
+ * the tx fifo (hence the MAX_FRAG_LEN).
+ */
+static int ns83820_hard_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        u32 free_idx, cmdsts, extsts;
+        int nr_free, nr_frags;
+        unsigned tx_done_idx, last_idx;
+        dma_addr_t buf;
+        unsigned len;
+        skb_frag_t *frag;
+        int stopped = 0;
+        int do_intr = 0;
+        volatile u32 *first_desc;
+
+        dprintk("ns83820_hard_start_xmit\n");
+
+        nr_frags =  skb_shinfo(skb)->nr_frags;
+again:
+        if (unlikely(dev->CFG_cache & CFG_LNKSTS)) {
+                netif_stop_queue(ndev);
+                if (unlikely(dev->CFG_cache & CFG_LNKSTS))
+                        return 1;
+                netif_start_queue(ndev);
+        }
+
+        last_idx = free_idx = dev->tx_free_idx;
+        tx_done_idx = dev->tx_done_idx;
+        nr_free = (tx_done_idx + NR_TX_DESC-2 - free_idx) % NR_TX_DESC;
+        nr_free -= 1;
+        if (nr_free <= nr_frags) {
+                dprintk("stop_queue - not enough(%p)\n", ndev);
+                netif_stop_queue(ndev);
+
+                /* Check again: we may have raced with a tx done irq */
+                if (dev->tx_done_idx != tx_done_idx) {
+                        dprintk("restart queue(%p)\n", ndev);
+                        netif_start_queue(ndev);
+                        goto again;
+                }
+                return 1;
+        }
+
+        if (free_idx == dev->tx_intr_idx) {
+                do_intr = 1;
+                dev->tx_intr_idx = (dev->tx_intr_idx + NR_TX_DESC/4) % NR_TX_DESC;
+        }
+
+        nr_free -= nr_frags;
+        if (nr_free < MIN_TX_DESC_FREE) {
+                dprintk("stop_queue - last entry(%p)\n", ndev);
+                netif_stop_queue(ndev);
+                stopped = 1;
+        }
+
+        frag = skb_shinfo(skb)->frags;
+        if (!nr_frags)
+                frag = NULL;
+        extsts = 0;
+        if (skb->ip_summed == CHECKSUM_HW) {
+                extsts |= EXTSTS_IPPKT;
+                if (IPPROTO_TCP == skb->nh.iph->protocol)
+                        extsts |= EXTSTS_TCPPKT;
+                else if (IPPROTO_UDP == skb->nh.iph->protocol)
+                        extsts |= EXTSTS_UDPPKT;
+        }
+
+#ifdef NS83820_VLAN_ACCEL_SUPPORT
+        if(vlan_tx_tag_present(skb)) {
+                /* fetch the vlan tag info out of the
+                 * ancilliary data if the vlan code
+                 * is using hw vlan acceleration
+                 */
+                short tag = vlan_tx_tag_get(skb);
+                extsts |= (EXTSTS_VPKT | htons(tag));
+        }
+#endif
+
+        len = skb->len;
+        if (nr_frags)
+                len -= skb->data_len;
+        buf = pci_map_single(dev->pci_dev, skb->data, len, PCI_DMA_TODEVICE);
+
+        first_desc = dev->tx_descs + (free_idx * DESC_SIZE);
+
+        for (;;) {
+                volatile u32 *desc = dev->tx_descs + (free_idx * DESC_SIZE);
+                u32 residue = 0;
+
+                dprintk("frag[%3u]: %4u @ 0x%08Lx\n", free_idx, len,
+                        (unsigned long long)buf);
+                last_idx = free_idx;
+                free_idx = (free_idx + 1) % NR_TX_DESC;
+                desc[DESC_LINK] = cpu_to_le32(dev->tx_phy_descs + (free_idx * DESC_SIZE * 4));
+                desc_addr_set(desc + DESC_BUFPTR, buf);
+                desc[DESC_EXTSTS] = cpu_to_le32(extsts);
+
+                cmdsts = ((nr_frags|residue) ? CMDSTS_MORE : do_intr ? CMDSTS_INTR : 0);
+                cmdsts |= (desc == first_desc) ? 0 : CMDSTS_OWN;
+                cmdsts |= len;
+                desc[DESC_CMDSTS] = cpu_to_le32(cmdsts);
+
+                if (residue) {
+                        buf += len;
+                        len = residue;
+                        continue;
+                }
+
+                if (!nr_frags)
+                        break;
+
+                buf = pci_map_page(dev->pci_dev, frag->page,
+                                   frag->page_offset,
+                                   frag->size, PCI_DMA_TODEVICE);
+                dprintk("frag: buf=%08Lx  page=%08lx offset=%08lx\n",
+                        (long long)buf, (long) page_to_pfn(frag->page),
+                        frag->page_offset);
+                len = frag->size;
+                frag++;
+                nr_frags--;
+        }
+        dprintk("done pkt\n");
+
+        spin_lock_irq(&dev->tx_lock);
+        dev->tx_skbs[last_idx] = skb;
+        first_desc[DESC_CMDSTS] |= cpu_to_le32(CMDSTS_OWN);
+        dev->tx_free_idx = free_idx;
+        atomic_inc(&dev->nr_tx_skbs);
+        spin_unlock_irq(&dev->tx_lock);
+
+        kick_tx(dev);
+
+        /* Check again: we may have raced with a tx done irq */
+        if (stopped && (dev->tx_done_idx != tx_done_idx) && start_tx_okay(dev))
+                netif_start_queue(ndev);
+
+        /* set the transmit start time to catch transmit timeouts */
+        ndev->trans_start = jiffies;
+        return 0;
+}
+
+static void ns83820_update_stats(struct ns83820 *dev)
+{
+        u8 __iomem *base = dev->base;
+
+        /* the DP83820 will freeze counters, so we need to read all of them */
+        dev->stats.rx_errors            += readl(base + 0x60) & 0xffff;
+        dev->stats.rx_crc_errors        += readl(base + 0x64) & 0xffff;
+        dev->stats.rx_missed_errors     += readl(base + 0x68) & 0xffff;
+        dev->stats.rx_frame_errors      += readl(base + 0x6c) & 0xffff;
+        /*dev->stats.rx_symbol_errors +=*/ readl(base + 0x70);
+        dev->stats.rx_length_errors     += readl(base + 0x74) & 0xffff;
+        dev->stats.rx_length_errors     += readl(base + 0x78) & 0xffff;
+        /*dev->stats.rx_badopcode_errors += */ readl(base + 0x7c);
+        /*dev->stats.rx_pause_count += */  readl(base + 0x80);
+        /*dev->stats.tx_pause_count += */  readl(base + 0x84);
+        dev->stats.tx_carrier_errors    += readl(base + 0x88) & 0xff;
+}
+
+static struct net_device_stats *ns83820_get_stats(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+
+        /* somewhat overkill */
+        spin_lock_irq(&dev->misc_lock);
+        ns83820_update_stats(dev);
+        spin_unlock_irq(&dev->misc_lock);
+
+        return &dev->stats;
+}
+
+static void ns83820_get_drvinfo(struct net_device *ndev, struct ethtool_drvinfo *info)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        strcpy(info->driver, "ns83820");
+        strcpy(info->version, VERSION);
+        strcpy(info->bus_info, pci_name(dev->pci_dev));
+}
+
+static u32 ns83820_get_link(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        u32 cfg = readl(dev->base + CFG) ^ SPDSTS_POLARITY;
+        return cfg & CFG_LNKSTS ? 1 : 0;
+}
+
+static struct ethtool_ops ops = {
+        .get_drvinfo = ns83820_get_drvinfo,
+        .get_link = ns83820_get_link
+};
+
+static void ns83820_mib_isr(struct ns83820 *dev)
+{
+        spin_lock(&dev->misc_lock);
+        ns83820_update_stats(dev);
+        spin_unlock(&dev->misc_lock);
+}
+
+static void ns83820_do_isr(struct net_device *ndev, u32 isr);
+static irqreturn_t ns83820_irq(int foo, void *data, struct pt_regs *regs)
+{
+        struct net_device *ndev = data;
+        struct ns83820 *dev = PRIV(ndev);
+        u32 isr;
+        dprintk("ns83820_irq(%p)\n", ndev);
+
+        dev->ihr = 0;
+
+        isr = readl(dev->base + ISR);
+        dprintk("irq: %08x\n", isr);
+        ns83820_do_isr(ndev, isr);
+        return IRQ_HANDLED;
+}
+
+static void ns83820_do_isr(struct net_device *ndev, u32 isr)
+{
+        struct ns83820 *dev = PRIV(ndev);
+#ifdef DEBUG
+        if (isr & ~(ISR_PHY | ISR_RXDESC | ISR_RXEARLY | ISR_RXOK | ISR_RXERR | ISR_TXIDLE | ISR_TXOK | ISR_TXDESC))
+                Dprintk("odd isr? 0x%08x\n", isr);
+#endif
+
+        if (ISR_RXIDLE & isr) {
+                dev->rx_info.idle = 1;
+                Dprintk("oh dear, we are idle\n");
+                ns83820_rx_kick(ndev);
+        }
+
+        if ((ISR_RXDESC | ISR_RXOK) & isr) {
+                prefetch(dev->rx_info.next_rx_desc);
+
+                spin_lock_irq(&dev->misc_lock);
+                dev->IMR_cache &= ~(ISR_RXDESC | ISR_RXOK);
+                writel(dev->IMR_cache, dev->base + IMR);
+                spin_unlock_irq(&dev->misc_lock);
+
+                tasklet_schedule(&dev->rx_tasklet);
+                //rx_irq(ndev);
+                //writel(4, dev->base + IHR);
+        }
+
+        if ((ISR_RXIDLE | ISR_RXORN | ISR_RXDESC | ISR_RXOK | ISR_RXERR) & isr)
+                ns83820_rx_kick(ndev);
+
+        if (unlikely(ISR_RXSOVR & isr)) {
+                //printk("overrun: rxsovr\n");
+                dev->stats.rx_fifo_errors ++;
+        }
+
+        if (unlikely(ISR_RXORN & isr)) {
+                //printk("overrun: rxorn\n");
+                dev->stats.rx_fifo_errors ++;
+        }
+
+        if ((ISR_RXRCMP & isr) && dev->rx_info.up)
+                writel(CR_RXE, dev->base + CR);
+
+        if (ISR_TXIDLE & isr) {
+                u32 txdp;
+                txdp = readl(dev->base + TXDP);
+                dprintk("txdp: %08x\n", txdp);
+                txdp -= dev->tx_phy_descs;
+                dev->tx_idx = txdp / (DESC_SIZE * 4);
+                if (dev->tx_idx >= NR_TX_DESC) {
+                        printk(KERN_ALERT "%s: BUG -- txdp out of range\n", ndev->name);
+                        dev->tx_idx = 0;
+                }
+                /* The may have been a race between a pci originated read
+                 * and the descriptor update from the cpu.  Just in case, 
+                 * kick the transmitter if the hardware thinks it is on a 
+                 * different descriptor than we are.
+                 */
+                if (dev->tx_idx != dev->tx_free_idx)
+                        kick_tx(dev);
+        }
+
+        /* Defer tx ring processing until more than a minimum amount of
+         * work has accumulated
+         */
+        if ((ISR_TXDESC | ISR_TXIDLE | ISR_TXOK | ISR_TXERR) & isr) {
+                do_tx_done(ndev);
+
+                /* Disable TxOk if there are no outstanding tx packets.
+                 */
+                if ((dev->tx_done_idx == dev->tx_free_idx) &&
+                    (dev->IMR_cache & ISR_TXOK)) {
+                        spin_lock_irq(&dev->misc_lock);
+                        dev->IMR_cache &= ~ISR_TXOK;
+                        writel(dev->IMR_cache, dev->base + IMR);
+                        spin_unlock_irq(&dev->misc_lock);
+                }
+        }
+
+        /* The TxIdle interrupt can come in before the transmit has
+         * completed.  Normally we reap packets off of the combination
+         * of TxDesc and TxIdle and leave TxOk disabled (since it 
+         * occurs on every packet), but when no further irqs of this 
+         * nature are expected, we must enable TxOk.
+         */
+        if ((ISR_TXIDLE & isr) && (dev->tx_done_idx != dev->tx_free_idx)) {
+                spin_lock_irq(&dev->misc_lock);
+                dev->IMR_cache |= ISR_TXOK;
+                writel(dev->IMR_cache, dev->base + IMR);
+                spin_unlock_irq(&dev->misc_lock);
+        }
+
+        /* MIB interrupt: one of the statistics counters is about to overflow */
+        if (unlikely(ISR_MIB & isr))
+                ns83820_mib_isr(dev);
+
+        /* PHY: Link up/down/negotiation state change */
+        if (unlikely(ISR_PHY & isr))
+                phy_intr(ndev);
+
+#if 0   /* Still working on the interrupt mitigation strategy */
+        if (dev->ihr)
+                writel(dev->ihr, dev->base + IHR);
+#endif
+}
+
+static void ns83820_do_reset(struct ns83820 *dev, u32 which)
+{
+        Dprintk("resetting chip...\n");
+        writel(which, dev->base + CR);
+        do {
+                schedule();
+        } while (readl(dev->base + CR) & which);
+        Dprintk("okay!\n");
+}
+
+static int ns83820_stop(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+
+        /* FIXME: protect against interrupt handler? */
+        del_timer_sync(&dev->tx_watchdog);
+
+        /* disable interrupts */
+        writel(0, dev->base + IMR);
+        writel(0, dev->base + IER);
+        readl(dev->base + IER);
+
+        dev->rx_info.up = 0;
+        synchronize_irq(dev->pci_dev->irq);
+
+        ns83820_do_reset(dev, CR_RST);
+
+        synchronize_irq(dev->pci_dev->irq);
+
+        spin_lock_irq(&dev->misc_lock);
+        dev->IMR_cache &= ~(ISR_TXURN | ISR_TXIDLE | ISR_TXERR | ISR_TXDESC | ISR_TXOK);
+        spin_unlock_irq(&dev->misc_lock);
+
+        ns83820_cleanup_rx(dev);
+        ns83820_cleanup_tx(dev);
+
+        return 0;
+}
+
+static void ns83820_tx_timeout(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        u32 tx_done_idx, *desc;
+        unsigned long flags;
+
+        local_irq_save(flags);
+
+        tx_done_idx = dev->tx_done_idx;
+        desc = dev->tx_descs + (tx_done_idx * DESC_SIZE);
+
+        printk(KERN_INFO "%s: tx_timeout: tx_done_idx=%d free_idx=%d cmdsts=%08x\n",
+                ndev->name,
+                tx_done_idx, dev->tx_free_idx, le32_to_cpu(desc[DESC_CMDSTS]));
+
+#if defined(DEBUG)
+        {
+                u32 isr;
+                isr = readl(dev->base + ISR);
+                printk("irq: %08x imr: %08x\n", isr, dev->IMR_cache);
+                ns83820_do_isr(ndev, isr);
+        }
+#endif
+
+        do_tx_done(ndev);
+
+        tx_done_idx = dev->tx_done_idx;
+        desc = dev->tx_descs + (tx_done_idx * DESC_SIZE);
+
+        printk(KERN_INFO "%s: after: tx_done_idx=%d free_idx=%d cmdsts=%08x\n",
+                ndev->name,
+                tx_done_idx, dev->tx_free_idx, le32_to_cpu(desc[DESC_CMDSTS]));
+
+        local_irq_restore(flags);
+}
+
+static void ns83820_tx_watch(unsigned long data)
+{
+        struct net_device *ndev = (void *)data;
+        struct ns83820 *dev = PRIV(ndev);
+
+#if defined(DEBUG)
+        printk("ns83820_tx_watch: %u %u %d\n",
+                dev->tx_done_idx, dev->tx_free_idx, atomic_read(&dev->nr_tx_skbs)
+                );
+#endif
+
+        if (time_after(jiffies, ndev->trans_start + 1*HZ) &&
+            dev->tx_done_idx != dev->tx_free_idx) {
+                printk(KERN_DEBUG "%s: ns83820_tx_watch: %u %u %d\n",
+                        ndev->name,
+                        dev->tx_done_idx, dev->tx_free_idx,
+                        atomic_read(&dev->nr_tx_skbs));
+                ns83820_tx_timeout(ndev);
+        }
+
+        mod_timer(&dev->tx_watchdog, jiffies + 2*HZ);
+}
+
+static int ns83820_open(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        unsigned i;
+        u32 desc;
+        int ret;
+
+        dprintk("ns83820_open\n");
+
+        writel(0, dev->base + PQCR);
+
+        ret = ns83820_setup_rx(ndev);
+        if (ret)
+                goto failed;
+
+        memset(dev->tx_descs, 0, 4 * NR_TX_DESC * DESC_SIZE);
+        for (i=0; i<NR_TX_DESC; i++) {
+                dev->tx_descs[(i * DESC_SIZE) + DESC_LINK]
+                                = cpu_to_le32(
+                                  dev->tx_phy_descs
+                                  + ((i+1) % NR_TX_DESC) * DESC_SIZE * 4);
+        }
+
+        dev->tx_idx = 0;
+        dev->tx_done_idx = 0;
+        desc = dev->tx_phy_descs;
+        writel(0, dev->base + TXDP_HI);
+        writel(desc, dev->base + TXDP);
+
+        init_timer(&dev->tx_watchdog);
+        dev->tx_watchdog.data = (unsigned long)ndev;
+        dev->tx_watchdog.function = ns83820_tx_watch;
+        mod_timer(&dev->tx_watchdog, jiffies + 2*HZ);
+
+        netif_start_queue(ndev);        /* FIXME: wait for phy to come up */
+
+        return 0;
+
+failed:
+        ns83820_stop(ndev);
+        return ret;
+}
+
+static void ns83820_getmac(struct ns83820 *dev, u8 *mac)
+{
+        unsigned i;
+        for (i=0; i<3; i++) {
+                u32 data;
+#if 0   /* I've left this in as an example of how to use eeprom.h */
+                data = eeprom_readw(&dev->ee, 0xa + 2 - i);
+#else
+                /* Read from the perfect match memory: this is loaded by
+                 * the chip from the EEPROM via the EELOAD self test.
+                 */
+                writel(i*2, dev->base + RFCR);
+                data = readl(dev->base + RFDR);
+#endif
+                *mac++ = data;
+                *mac++ = data >> 8;
+        }
+}
+
+static int ns83820_change_mtu(struct net_device *ndev, int new_mtu)
+{
+        if (new_mtu > RX_BUF_SIZE)
+                return -EINVAL;
+        ndev->mtu = new_mtu;
+        return 0;
+}
+
+static void ns83820_set_multicast(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        u8 __iomem *rfcr = dev->base + RFCR;
+        u32 and_mask = 0xffffffff;
+        u32 or_mask = 0;
+        u32 val;
+
+        if (ndev->flags & IFF_PROMISC)
+                or_mask |= RFCR_AAU | RFCR_AAM;
+        else
+                and_mask &= ~(RFCR_AAU | RFCR_AAM);
+
+        if (ndev->flags & IFF_ALLMULTI)
+                or_mask |= RFCR_AAM;
+        else
+                and_mask &= ~RFCR_AAM;
+
+        spin_lock_irq(&dev->misc_lock);
+        val = (readl(rfcr) & and_mask) | or_mask;
+        /* Ramit : RFCR Write Fix doc says RFEN must be 0 modify other bits */
+        writel(val & ~RFCR_RFEN, rfcr);
+        writel(val, rfcr);
+        spin_unlock_irq(&dev->misc_lock);
+}
+
+static void ns83820_run_bist(struct net_device *ndev, const char *name, u32 enable, u32 done, u32 fail)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        int timed_out = 0;
+        long start;
+        u32 status;
+        int loops = 0;
+
+        dprintk("%s: start %s\n", ndev->name, name);
+
+        start = jiffies;
+
+        writel(enable, dev->base + PTSCR);
+        for (;;) {
+                loops++;
+                status = readl(dev->base + PTSCR);
+                if (!(status & enable))
+                        break;
+                if (status & done)
+                        break;
+                if (status & fail)
+                        break;
+                if ((jiffies - start) >= HZ) {
+                        timed_out = 1;
+                        break;
+                }
+                set_current_state(TASK_UNINTERRUPTIBLE);
+                schedule_timeout(1);
+        }
+
+        if (status & fail)
+                printk(KERN_INFO "%s: %s failed! (0x%08x & 0x%08x)\n",
+                        ndev->name, name, status, fail);
+        else if (timed_out)
+                printk(KERN_INFO "%s: run_bist %s timed out! (%08x)\n",
+                        ndev->name, name, status);
+
+        dprintk("%s: done %s in %d loops\n", ndev->name, name, loops);
+}
+
+#ifdef PHY_CODE_IS_FINISHED
+static void ns83820_mii_write_bit(struct ns83820 *dev, int bit)
+{
+        /* drive MDC low */
+        dev->MEAR_cache &= ~MEAR_MDC;
+        writel(dev->MEAR_cache, dev->base + MEAR);
+        readl(dev->base + MEAR);
+
+        /* enable output, set bit */
+        dev->MEAR_cache |= MEAR_MDDIR;
+        if (bit)
+                dev->MEAR_cache |= MEAR_MDIO;
+        else
+                dev->MEAR_cache &= ~MEAR_MDIO;
+
+        /* set the output bit */
+        writel(dev->MEAR_cache, dev->base + MEAR);
+        readl(dev->base + MEAR);
+
+        /* Wait.  Max clock rate is 2.5MHz, this way we come in under 1MHz */
+        udelay(1);
+
+        /* drive MDC high causing the data bit to be latched */
+        dev->MEAR_cache |= MEAR_MDC;
+        writel(dev->MEAR_cache, dev->base + MEAR);
+        readl(dev->base + MEAR);
+
+        /* Wait again... */
+        udelay(1);
+}
+
+static int ns83820_mii_read_bit(struct ns83820 *dev)
+{
+        int bit;
+
+        /* drive MDC low, disable output */
+        dev->MEAR_cache &= ~MEAR_MDC;
+        dev->MEAR_cache &= ~MEAR_MDDIR;
+        writel(dev->MEAR_cache, dev->base + MEAR);
+        readl(dev->base + MEAR);
+
+        /* Wait.  Max clock rate is 2.5MHz, this way we come in under 1MHz */
+        udelay(1);
+
+        /* drive MDC high causing the data bit to be latched */
+        bit = (readl(dev->base + MEAR) & MEAR_MDIO) ? 1 : 0;
+        dev->MEAR_cache |= MEAR_MDC;
+        writel(dev->MEAR_cache, dev->base + MEAR);
+
+        /* Wait again... */
+        udelay(1);
+
+        return bit;
+}
+
+static unsigned ns83820_mii_read_reg(struct ns83820 *dev, unsigned phy, unsigned reg)
+{
+        unsigned data = 0;
+        int i;
+
+        /* read some garbage so that we eventually sync up */
+        for (i=0; i<64; i++)
+                ns83820_mii_read_bit(dev);
+
+        ns83820_mii_write_bit(dev, 0);  /* start */
+        ns83820_mii_write_bit(dev, 1);
+        ns83820_mii_write_bit(dev, 1);  /* opcode read */
+        ns83820_mii_write_bit(dev, 0);
+
+        /* write out the phy address: 5 bits, msb first */
+        for (i=0; i<5; i++)
+                ns83820_mii_write_bit(dev, phy & (0x10 >> i));
+
+        /* write out the register address, 5 bits, msb first */
+        for (i=0; i<5; i++)
+                ns83820_mii_write_bit(dev, reg & (0x10 >> i));
+
+        ns83820_mii_read_bit(dev);      /* turn around cycles */
+        ns83820_mii_read_bit(dev);
+
+        /* read in the register data, 16 bits msb first */
+        for (i=0; i<16; i++) {
+                data <<= 1;
+                data |= ns83820_mii_read_bit(dev);
+        }
+
+        return data;
+}
+
+static unsigned ns83820_mii_write_reg(struct ns83820 *dev, unsigned phy, unsigned reg, unsigned data)
+{
+        int i;
+
+        /* read some garbage so that we eventually sync up */
+        for (i=0; i<64; i++)
+                ns83820_mii_read_bit(dev);
+
+        ns83820_mii_write_bit(dev, 0);  /* start */
+        ns83820_mii_write_bit(dev, 1);
+        ns83820_mii_write_bit(dev, 0);  /* opcode read */
+        ns83820_mii_write_bit(dev, 1);
+
+        /* write out the phy address: 5 bits, msb first */
+        for (i=0; i<5; i++)
+                ns83820_mii_write_bit(dev, phy & (0x10 >> i));
+
+        /* write out the register address, 5 bits, msb first */
+        for (i=0; i<5; i++)
+                ns83820_mii_write_bit(dev, reg & (0x10 >> i));
+
+        ns83820_mii_read_bit(dev);      /* turn around cycles */
+        ns83820_mii_read_bit(dev);
+
+        /* read in the register data, 16 bits msb first */
+        for (i=0; i<16; i++)
+                ns83820_mii_write_bit(dev, (data >> (15 - i)) & 1);
+
+        return data;
+}
+
+static void ns83820_probe_phy(struct net_device *ndev)
+{
+        struct ns83820 *dev = PRIV(ndev);
+        static int first;
+        int i;
+#define MII_PHYIDR1     0x02
+#define MII_PHYIDR2     0x03
+
+#if 0
+        if (!first) {
+                unsigned tmp;
+                ns83820_mii_read_reg(dev, 1, 0x09);
+                ns83820_mii_write_reg(dev, 1, 0x10, 0x0d3e);
+
+                tmp = ns83820_mii_read_reg(dev, 1, 0x00);
+                ns83820_mii_write_reg(dev, 1, 0x00, tmp | 0x8000);
+                udelay(1300);
+                ns83820_mii_read_reg(dev, 1, 0x09);
+        }
+#endif
+        first = 1;
+
+        for (i=1; i<2; i++) {
+                int j;
+                unsigned a, b;
+                a = ns83820_mii_read_reg(dev, i, MII_PHYIDR1);
+                b = ns83820_mii_read_reg(dev, i, MII_PHYIDR2);
+
+                //printk("%s: phy %d: 0x%04x 0x%04x\n",
+                //      ndev->name, i, a, b);
+
+                for (j=0; j<0x16; j+=4) {
+                        dprintk("%s: [0x%02x] %04x %04x %04x %04x\n",
+                                ndev->name, j,
+                                ns83820_mii_read_reg(dev, i, 0 + j),
+                                ns83820_mii_read_reg(dev, i, 1 + j),
+                                ns83820_mii_read_reg(dev, i, 2 + j),
+                                ns83820_mii_read_reg(dev, i, 3 + j)
+                                );
+                }
+        }
+        {
+                unsigned a, b;
+                /* read firmware version: memory addr is 0x8402 and 0x8403 */
+                ns83820_mii_write_reg(dev, 1, 0x16, 0x000d);
+                ns83820_mii_write_reg(dev, 1, 0x1e, 0x810e);
+                a = ns83820_mii_read_reg(dev, 1, 0x1d);
+
+                ns83820_mii_write_reg(dev, 1, 0x16, 0x000d);
+                ns83820_mii_write_reg(dev, 1, 0x1e, 0x810e);
+                b = ns83820_mii_read_reg(dev, 1, 0x1d);
+                dprintk("version: 0x%04x 0x%04x\n", a, b);
+        }
+}
+#endif
+
+static int __devinit ns83820_init_one(struct pci_dev *pci_dev, const struct pci_device_id *id)
+{
+        struct net_device *ndev;
+        struct ns83820 *dev;
+        long addr;
+        int err;
+        int using_dac = 0;
+
+        /* See if we can set the dma mask early on; failure is fatal. */
+        if (TRY_DAC && !pci_set_dma_mask(pci_dev, 0xffffffffffffffffULL)) {
+                using_dac = 1;
+        } else if (!pci_set_dma_mask(pci_dev, 0xffffffff)) {
+                using_dac = 0;
+        } else {
+                printk(KERN_WARNING "ns83820.c: pci_set_dma_mask failed!\n");
+                return -ENODEV;
+        }
+
+        ndev = alloc_etherdev(sizeof(struct ns83820));
+        dev = PRIV(ndev);
+        err = -ENOMEM;
+        if (!dev)
+                goto out;
+
+        spin_lock_init(&dev->rx_info.lock);
+        spin_lock_init(&dev->tx_lock);
+        spin_lock_init(&dev->misc_lock);
+        dev->pci_dev = pci_dev;
+
+        dev->ee.cache = &dev->MEAR_cache;
+        dev->ee.lock = &dev->misc_lock;
+        SET_MODULE_OWNER(ndev);
+        SET_NETDEV_DEV(ndev, &pci_dev->dev);
+
+        INIT_WORK(&dev->tq_refill, queue_refill, ndev);
+        tasklet_init(&dev->rx_tasklet, rx_action, (unsigned long)ndev);
+
+        err = pci_enable_device(pci_dev);
+        if (err) {
+                printk(KERN_INFO "ns83820: pci_enable_dev failed: %d\n", err);
+                goto out_free;
+        }
+
+        pci_set_master(pci_dev);
+        addr = pci_resource_start(pci_dev, 1);
+        dev->base = ioremap_nocache(addr, PAGE_SIZE);
+        dev->tx_descs = pci_alloc_consistent(pci_dev,
+                        4 * DESC_SIZE * NR_TX_DESC, &dev->tx_phy_descs);
+        dev->rx_info.descs = pci_alloc_consistent(pci_dev,
+                        4 * DESC_SIZE * NR_RX_DESC, &dev->rx_info.phy_descs);
+        err = -ENOMEM;
+        if (!dev->base || !dev->tx_descs || !dev->rx_info.descs)
+                goto out_disable;
+
+        dprintk("%p: %08lx  %p: %08lx\n",
+                dev->tx_descs, (long)dev->tx_phy_descs,
+                dev->rx_info.descs, (long)dev->rx_info.phy_descs);
+
+        /* disable interrupts */
+        writel(0, dev->base + IMR);
+        writel(0, dev->base + IER);
+        readl(dev->base + IER);
+
+        dev->IMR_cache = 0;
+
+        setup_ee_mem_bitbanger(&dev->ee, dev->base + MEAR, 3, 2, 1, 0,
+                0);
+
+        err = request_irq(pci_dev->irq, ns83820_irq, SA_SHIRQ,
+                          DRV_NAME, ndev);
+        if (err) {
+                printk(KERN_INFO "ns83820: unable to register irq %d\n",
+                        pci_dev->irq);
+                goto out_disable;
+        }
+
+        /*
+         * FIXME: we are holding rtnl_lock() over obscenely long area only
+         * because some of the setup code uses dev->name.  It's Wrong(tm) -
+         * we should be using driver-specific names for all that stuff.
+         * For now that will do, but we really need to come back and kill
+         * most of the dev_alloc_name() users later.
+         */
+        rtnl_lock();
+        err = dev_alloc_name(ndev, ndev->name);
+        if (err < 0) {
+                printk(KERN_INFO "ns83820: unable to get netdev name: %d\n", err);
+                goto out_free_irq;
+        }
+
+        printk("%s: ns83820.c: 0x22c: %08x, subsystem: %04x:%04x\n",
+                ndev->name, le32_to_cpu(readl(dev->base + 0x22c)),
+                pci_dev->subsystem_vendor, pci_dev->subsystem_device);
+
+        ndev->open = ns83820_open;
+        ndev->stop = ns83820_stop;
+        ndev->hard_start_xmit = ns83820_hard_start_xmit;
+        ndev->get_stats = ns83820_get_stats;
+        ndev->change_mtu = ns83820_change_mtu;
+        ndev->set_multicast_list = ns83820_set_multicast;
+        SET_ETHTOOL_OPS(ndev, &ops);
+        ndev->tx_timeout = ns83820_tx_timeout;
+        ndev->watchdog_timeo = 5 * HZ;
+        pci_set_drvdata(pci_dev, ndev);
+
+        ns83820_do_reset(dev, CR_RST);
+
+        /* Must reset the ram bist before running it */
+        writel(PTSCR_RBIST_RST, dev->base + PTSCR);
+        ns83820_run_bist(ndev, "sram bist",   PTSCR_RBIST_EN,
+                         PTSCR_RBIST_DONE, PTSCR_RBIST_FAIL);
+        ns83820_run_bist(ndev, "eeprom bist", PTSCR_EEBIST_EN, 0,
+                         PTSCR_EEBIST_FAIL);
+        ns83820_run_bist(ndev, "eeprom load", PTSCR_EELOAD_EN, 0, 0);
+
+        /* I love config registers */
+        dev->CFG_cache = readl(dev->base + CFG);
+
+        if ((dev->CFG_cache & CFG_PCI64_DET)) {
+                printk(KERN_INFO "%s: detected 64 bit PCI data bus.\n",
+                        ndev->name);
+                /*dev->CFG_cache |= CFG_DATA64_EN;*/
+                if (!(dev->CFG_cache & CFG_DATA64_EN))
+                        printk(KERN_INFO "%s: EEPROM did not enable 64 bit bus.  Disabled.\n",
+                                ndev->name);
+        } else
+                dev->CFG_cache &= ~(CFG_DATA64_EN);
+
+        dev->CFG_cache &= (CFG_TBI_EN  | CFG_MRM_DIS   | CFG_MWI_DIS |
+                           CFG_T64ADDR | CFG_DATA64_EN | CFG_EXT_125 |
+                           CFG_M64ADDR);
+        dev->CFG_cache |= CFG_PINT_DUPSTS | CFG_PINT_LNKSTS | CFG_PINT_SPDSTS |
+                          CFG_EXTSTS_EN   | CFG_EXD         | CFG_PESEL;
+        dev->CFG_cache |= CFG_REQALG;
+        dev->CFG_cache |= CFG_POW;
+        dev->CFG_cache |= CFG_TMRTEST;
+
+        /* When compiled with 64 bit addressing, we must always enable
+         * the 64 bit descriptor format.
+         */
+#ifdef USE_64BIT_ADDR
+        dev->CFG_cache |= CFG_M64ADDR;
+#endif
+        if (using_dac)
+                dev->CFG_cache |= CFG_T64ADDR;
+
+        /* Big endian mode does not seem to do what the docs suggest */
+        dev->CFG_cache &= ~CFG_BEM;
+
+        /* setup optical transceiver if we have one */
+        if (dev->CFG_cache & CFG_TBI_EN) {
+                printk(KERN_INFO "%s: enabling optical transceiver\n",
+                        ndev->name);
+                writel(readl(dev->base + GPIOR) | 0x3e8, dev->base + GPIOR);
+
+                /* setup auto negotiation feature advertisement */
+                writel(readl(dev->base + TANAR)
+                       | TANAR_HALF_DUP | TANAR_FULL_DUP,
+                       dev->base + TANAR);
+
+                /* start auto negotiation */
+                writel(TBICR_MR_AN_ENABLE | TBICR_MR_RESTART_AN,
+                       dev->base + TBICR);
+                writel(TBICR_MR_AN_ENABLE, dev->base + TBICR);
+                dev->linkstate = LINK_AUTONEGOTIATE;
+
+                dev->CFG_cache |= CFG_MODE_1000;
+        }
+
+        writel(dev->CFG_cache, dev->base + CFG);
+        dprintk("CFG: %08x\n", dev->CFG_cache);
+
+        if (reset_phy) {
+                printk(KERN_INFO "%s: resetting phy\n", ndev->name);
+                writel(dev->CFG_cache | CFG_PHY_RST, dev->base + CFG);
+                msleep(10);
+                writel(dev->CFG_cache, dev->base + CFG);
+        }
+
+#if 0   /* Huh?  This sets the PCI latency register.  Should be done via 
+         * the PCI layer.  FIXME.
+         */
+        if (readl(dev->base + SRR))
+                writel(readl(dev->base+0x20c) | 0xfe00, dev->base + 0x20c);
+#endif
+
+        /* Note!  The DMA burst size interacts with packet
+         * transmission, such that the largest packet that
+         * can be transmitted is 8192 - FLTH - burst size.
+         * If only the transmit fifo was larger...
+         */
+        /* Ramit : 1024 DMA is not a good idea, it ends up banging 
+         * some DELL and COMPAQ SMP systems */
+        writel(TXCFG_CSI | TXCFG_HBI | TXCFG_ATP | TXCFG_MXDMA512
+                | ((1600 / 32) * 0x100),
+                dev->base + TXCFG);
+
+        /* Flush the interrupt holdoff timer */
+        writel(0x000, dev->base + IHR);
+        writel(0x100, dev->base + IHR);
+        writel(0x000, dev->base + IHR);
+
+        /* Set Rx to full duplex, don't accept runt, errored, long or length
+         * range errored packets.  Use 512 byte DMA.
+         */
+        /* Ramit : 1024 DMA is not a good idea, it ends up banging 
+         * some DELL and COMPAQ SMP systems 
+         * Turn on ALP, only we are accpeting Jumbo Packets */
+        writel(RXCFG_AEP | RXCFG_ARP | RXCFG_AIRL | RXCFG_RX_FD
+                | RXCFG_STRIPCRC
+                //| RXCFG_ALP
+                | (RXCFG_MXDMA512) | 0, dev->base + RXCFG);
+
+        /* Disable priority queueing */
+        writel(0, dev->base + PQCR);
+
+        /* Enable IP checksum validation and detetion of VLAN headers.
+         * Note: do not set the reject options as at least the 0x102
+         * revision of the chip does not properly accept IP fragments
+         * at least for UDP.
+         */
+        /* Ramit : Be sure to turn on RXCFG_ARP if VLAN's are enabled, since
+         * the MAC it calculates the packetsize AFTER stripping the VLAN
+         * header, and if a VLAN Tagged packet of 64 bytes is received (like
+         * a ping with a VLAN header) then the card, strips the 4 byte VLAN
+         * tag and then checks the packet size, so if RXCFG_ARP is not enabled,
+         * it discrards it!.  These guys......
+         * also turn on tag stripping if hardware acceleration is enabled
+         */
+#ifdef NS83820_VLAN_ACCEL_SUPPORT
+#define VRCR_INIT_VALUE (VRCR_IPEN|VRCR_VTDEN|VRCR_VTREN) 
+#else
+#define VRCR_INIT_VALUE (VRCR_IPEN|VRCR_VTDEN)
+#endif
+        writel(VRCR_INIT_VALUE, dev->base + VRCR);
+
+        /* Enable per-packet TCP/UDP/IP checksumming
+         * and per packet vlan tag insertion if
+         * vlan hardware acceleration is enabled
+         */
+#ifdef NS83820_VLAN_ACCEL_SUPPORT
+#define VTCR_INIT_VALUE (VTCR_PPCHK|VTCR_VPPTI)
+#else
+#define VTCR_INIT_VALUE VTCR_PPCHK
+#endif
+        writel(VTCR_INIT_VALUE, dev->base + VTCR);
+
+        /* Ramit : Enable async and sync pause frames */
+        /* writel(0, dev->base + PCR); */
+        writel((PCR_PS_MCAST | PCR_PS_DA | PCR_PSEN | PCR_FFLO_4K |
+                PCR_FFHI_8K | PCR_STLO_4 | PCR_STHI_8 | PCR_PAUSE_CNT),
+                dev->base + PCR);
+
+        /* Disable Wake On Lan */
+        writel(0, dev->base + WCSR);
+
+        ns83820_getmac(dev, ndev->dev_addr);
+
+        /* Yes, we support dumb IP checksum on transmit */
+        ndev->features |= NETIF_F_SG;
+        ndev->features |= NETIF_F_IP_CSUM;
+
+#ifdef NS83820_VLAN_ACCEL_SUPPORT
+        /* We also support hardware vlan acceleration */
+        ndev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
+        ndev->vlan_rx_register = ns83820_vlan_rx_register;
+        ndev->vlan_rx_kill_vid = ns83820_vlan_rx_kill_vid;
+#endif
+
+        if (using_dac) {
+                printk(KERN_INFO "%s: using 64 bit addressing.\n",
+                        ndev->name);
+                ndev->features |= NETIF_F_HIGHDMA;
+        }
+
+        printk(KERN_INFO "%s: ns83820 v" VERSION ": DP83820 v%u.%u: %02x:%02x:%02x:%02x:%02x:%02x io=0x%08lx irq=%d f=%s\n",
+                ndev->name,
+                (unsigned)readl(dev->base + SRR) >> 8,
+                (unsigned)readl(dev->base + SRR) & 0xff,
+                ndev->dev_addr[0], ndev->dev_addr[1],
+                ndev->dev_addr[2], ndev->dev_addr[3],
+                ndev->dev_addr[4], ndev->dev_addr[5],
+                addr, pci_dev->irq,
+                (ndev->features & NETIF_F_HIGHDMA) ? "h,sg" : "sg"
+                );
+
+#ifdef PHY_CODE_IS_FINISHED
+        ns83820_probe_phy(ndev);
+#endif
+
+        err = register_netdevice(ndev);
+        if (err) {
+                printk(KERN_INFO "ns83820: unable to register netdev: %d\n", err);
+                goto out_cleanup;
+        }
+        rtnl_unlock();
+
+        return 0;
+
+out_cleanup:
+        writel(0, dev->base + IMR);     /* paranoia */
+        writel(0, dev->base + IER);
+        readl(dev->base + IER);
+out_free_irq:
+        rtnl_unlock();
+        free_irq(pci_dev->irq, ndev);
+out_disable:
+        if (dev->base)
+                iounmap(dev->base);
+        pci_free_consistent(pci_dev, 4 * DESC_SIZE * NR_TX_DESC, dev->tx_descs, dev->tx_phy_descs);
+        pci_free_consistent(pci_dev, 4 * DESC_SIZE * NR_RX_DESC, dev->rx_info.descs, dev->rx_info.phy_descs);
+        pci_disable_device(pci_dev);
+out_free:
+        free_netdev(ndev);
+        pci_set_drvdata(pci_dev, NULL);
+out:
+        return err;
+}
+
+static void __devexit ns83820_remove_one(struct pci_dev *pci_dev)
+{
+        struct net_device *ndev = pci_get_drvdata(pci_dev);
+        struct ns83820 *dev = PRIV(ndev); /* ok even if NULL */
+
+        if (!ndev)                      /* paranoia */
+                return;
+
+        writel(0, dev->base + IMR);     /* paranoia */
+        writel(0, dev->base + IER);
+        readl(dev->base + IER);
+
+        unregister_netdev(ndev);
+        free_irq(dev->pci_dev->irq, ndev);
+        iounmap(dev->base);
+        pci_free_consistent(dev->pci_dev, 4 * DESC_SIZE * NR_TX_DESC,
+                        dev->tx_descs, dev->tx_phy_descs);
+        pci_free_consistent(dev->pci_dev, 4 * DESC_SIZE * NR_RX_DESC,
+                        dev->rx_info.descs, dev->rx_info.phy_descs);
+        pci_disable_device(dev->pci_dev);
+        free_netdev(ndev);
+        pci_set_drvdata(pci_dev, NULL);
+}
+
+static struct pci_device_id ns83820_pci_tbl[] = {
+        { 0x100b, 0x0022, PCI_ANY_ID, PCI_ANY_ID, 0, .driver_data = 0, },
+        { 0, },
+};
+
+static struct pci_driver driver = {
+        .name           = "ns83820",
+        .id_table       = ns83820_pci_tbl,
+        .probe          = ns83820_init_one,
+        .remove         = __devexit_p(ns83820_remove_one),
+#if 0   /* FIXME: implement */
+        .suspend        = ,
+        .resume         = ,
+#endif
+};
+
+
+static int __init ns83820_init(void)
+{
+        printk(KERN_INFO "ns83820.c: National Semiconductor DP83820 10/100/1000 driver.\n");
+        return pci_module_init(&driver);
+}
+
+static void __exit ns83820_exit(void)
+{
+        pci_unregister_driver(&driver);
+}
+
+MODULE_AUTHOR("Benjamin LaHaise <bcrl@kvack.org>");
+MODULE_DESCRIPTION("National Semiconductor DP83820 10/100/1000 driver");
+MODULE_LICENSE("GPL");
+
+MODULE_DEVICE_TABLE(pci, ns83820_pci_tbl);
+
+module_param(lnksts, int, 0);
+MODULE_PARM_DESC(lnksts, "Polarity of LNKSTS bit");
+
+module_param(ihr, int, 0);
+MODULE_PARM_DESC(ihr, "Time in 100 us increments to delay interrupts (range 0-127)");
+
+module_param(reset_phy, int, 0);
+MODULE_PARM_DESC(reset_phy, "Set to 1 to reset the PHY on startup");
+
+module_init(ns83820_init);
+module_exit(ns83820_exit);