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sunlance.c

/* $Id: sunlance.c,v 1.112 2002/01/15 06:48:55 davem Exp $
 * lance.c: Linux/Sparc/Lance driver
 *
 *    Written 1995, 1996 by Miguel de Icaza
 * Sources:
 *    The Linux  depca driver
 *    The Linux  lance driver.
 *    The Linux  skeleton driver.
 *    The NetBSD Sparc/Lance driver.
 *    Theo de Raadt (deraadt@openbsd.org)
 *    NCR92C990 Lan Controller manual
 *
 * 1.4:
 *    Added support to run with a ledma on the Sun4m
 *
 * 1.5:
 *    Added multiple card detection.
 *
 *     4/17/96: Burst sizes and tpe selection on sun4m by Eddie C. Dost
 *            (ecd@skynet.be)
 *
 *     5/15/96: auto carrier detection on sun4m by Eddie C. Dost
 *            (ecd@skynet.be)
 *
 *     5/17/96: lebuffer on scsi/ether cards now work David S. Miller
 *            (davem@caip.rutgers.edu)
 *
 *     5/29/96: override option 'tpe-link-test?', if it is 'false', as
 *            this disables auto carrier detection on sun4m. Eddie C. Dost
 *            (ecd@skynet.be)
 *
 * 1.7:
 *     6/26/96: Bug fix for multiple ledmas, miguel.
 *
 * 1.8:
 *            Stole multicast code from depca.c, fixed lance_tx.
 *
 * 1.9:
 *     8/21/96: Fixed the multicast code (Pedro Roque)
 *
 *     8/28/96: Send fake packet in lance_open() if auto_select is true,
 *            so we can detect the carrier loss condition in time.
 *            Eddie C. Dost (ecd@skynet.be)
 *
 *     9/15/96: Align rx_buf so that eth_copy_and_sum() won't cause an
 *            MNA trap during chksum_partial_copy(). (ecd@skynet.be)
 *
 *    11/17/96: Handle LE_C0_MERR in lance_interrupt(). (ecd@skynet.be)
 *
 *    12/22/96: Don't loop forever in lance_rx() on incomplete packets.
 *            This was the sun4c killer. Shit, stupid bug.
 *            (ecd@skynet.be)
 *
 * 1.10:
 *     1/26/97: Modularize driver. (ecd@skynet.be)
 *
 * 1.11:
 *    12/27/97: Added sun4d support. (jj@sunsite.mff.cuni.cz)
 *
 * 1.12:
 *     11/3/99: Fixed SMP race in lance_start_xmit found by davem.
 *              Anton Blanchard (anton@progsoc.uts.edu.au)
 * 2.00: 11/9/99: Massive overhaul and port to new SBUS driver interfaces.
 *            David S. Miller (davem@redhat.com)
 * 2.01:
 *      11/08/01: Use library crc32 functions (Matt_Domsch@dell.com)
 *
 */

#undef DEBUG_DRIVER

static char lancestr[] = "LANCE";

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/errno.h>
#include <linux/socket.h> /* Used for the temporal inet entries and routing */
#include <linux/route.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/pgtable.h>
#include <asm/byteorder.h>    /* Used by the checksum routines */
#include <asm/idprom.h>
#include <asm/sbus.h>
#include <asm/prom.h>
#include <asm/auxio.h>        /* For tpe-link-test? setting */
#include <asm/irq.h>

#define DRV_NAME  "sunlance"
#define DRV_VERSION     "2.02"
#define DRV_RELDATE     "8/24/03"
#define DRV_AUTHOR      "Miguel de Icaza (miguel@nuclecu.unam.mx)"

static char version[] =
      DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " " DRV_AUTHOR "\n";

MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION("Sun Lance ethernet driver");
MODULE_LICENSE("GPL");

/* Define: 2^4 Tx buffers and 2^4 Rx buffers */
#ifndef LANCE_LOG_TX_BUFFERS
#define LANCE_LOG_TX_BUFFERS 4
#define LANCE_LOG_RX_BUFFERS 4
#endif

#define LE_CSR0 0
#define LE_CSR1 1
#define LE_CSR2 2
#define LE_CSR3 3

#define LE_MO_PROM      0x8000  /* Enable promiscuous mode */

#define     LE_C0_ERR   0x8000      /* Error: set if BAB, SQE, MISS or ME is set */
#define     LE_C0_BABL  0x4000      /* BAB:  Babble: tx timeout. */
#define     LE_C0_CERR  0x2000      /* SQE:  Signal quality error */
#define     LE_C0_MISS  0x1000      /* MISS: Missed a packet */
#define     LE_C0_MERR  0x0800      /* ME:   Memory error */
#define     LE_C0_RINT  0x0400      /* Received interrupt */
#define     LE_C0_TINT  0x0200      /* Transmitter Interrupt */
#define     LE_C0_IDON  0x0100      /* IFIN: Init finished. */
#define     LE_C0_INTR  0x0080      /* Interrupt or error */
#define     LE_C0_INEA  0x0040      /* Interrupt enable */
#define     LE_C0_RXON  0x0020      /* Receiver on */
#define     LE_C0_TXON  0x0010      /* Transmitter on */
#define     LE_C0_TDMD  0x0008      /* Transmitter demand */
#define     LE_C0_STOP  0x0004      /* Stop the card */
#define     LE_C0_STRT  0x0002      /* Start the card */
#define     LE_C0_INIT  0x0001      /* Init the card */

#define     LE_C3_BSWP  0x4     /* SWAP */
#define     LE_C3_ACON  0x2   /* ALE Control */
#define     LE_C3_BCON  0x1   /* Byte control */

/* Receive message descriptor 1 */
#define LE_R1_OWN       0x80    /* Who owns the entry */
#define LE_R1_ERR       0x40    /* Error: if FRA, OFL, CRC or BUF is set */
#define LE_R1_FRA       0x20    /* FRA: Frame error */
#define LE_R1_OFL       0x10    /* OFL: Frame overflow */
#define LE_R1_CRC       0x08    /* CRC error */
#define LE_R1_BUF       0x04    /* BUF: Buffer error */
#define LE_R1_SOP       0x02    /* Start of packet */
#define LE_R1_EOP       0x01    /* End of packet */
#define LE_R1_POK       0x03    /* Packet is complete: SOP + EOP */

#define LE_T1_OWN       0x80    /* Lance owns the packet */
#define LE_T1_ERR       0x40    /* Error summary */
#define LE_T1_EMORE     0x10    /* Error: more than one retry needed */
#define LE_T1_EONE      0x08    /* Error: one retry needed */
#define LE_T1_EDEF      0x04    /* Error: deferred */
#define LE_T1_SOP       0x02    /* Start of packet */
#define LE_T1_EOP       0x01    /* End of packet */
#define LE_T1_POK 0x03  /* Packet is complete: SOP + EOP */

#define LE_T3_BUF       0x8000  /* Buffer error */
#define LE_T3_UFL       0x4000  /* Error underflow */
#define LE_T3_LCOL      0x1000  /* Error late collision */
#define LE_T3_CLOS      0x0800  /* Error carrier loss */
#define LE_T3_RTY       0x0400  /* Error retry */
#define LE_T3_TDR       0x03ff  /* Time Domain Reflectometry counter */

#define TX_RING_SIZE                (1 << (LANCE_LOG_TX_BUFFERS))
#define TX_RING_MOD_MASK            (TX_RING_SIZE - 1)
#define TX_RING_LEN_BITS            ((LANCE_LOG_TX_BUFFERS) << 29)
#define TX_NEXT(__x)                (((__x)+1) & TX_RING_MOD_MASK)

#define RX_RING_SIZE                (1 << (LANCE_LOG_RX_BUFFERS))
#define RX_RING_MOD_MASK            (RX_RING_SIZE - 1)
#define RX_RING_LEN_BITS            ((LANCE_LOG_RX_BUFFERS) << 29)
#define RX_NEXT(__x)                (((__x)+1) & RX_RING_MOD_MASK)

#define PKT_BUF_SZ            1544
#define RX_BUFF_SIZE            PKT_BUF_SZ
#define TX_BUFF_SIZE            PKT_BUF_SZ

struct lance_rx_desc {
      u16   rmd0;       /* low address of packet */
      u8    rmd1_bits;  /* descriptor bits */
      u8    rmd1_hadr;  /* high address of packet */
      s16   length;           /* This length is 2s complement (negative)!
                         * Buffer length
                         */
      u16   mblength;   /* This is the actual number of bytes received */
};

struct lance_tx_desc {
      u16   tmd0;       /* low address of packet */
      u8    tmd1_bits;  /* descriptor bits */
      u8    tmd1_hadr;  /* high address of packet */
      s16   length;           /* Length is 2s complement (negative)! */
      u16   misc;
};

/* The LANCE initialization block, described in databook. */
/* On the Sparc, this block should be on a DMA region     */
struct lance_init_block {
      u16   mode;       /* Pre-set mode (reg. 15) */
      u8    phys_addr[6];     /* Physical ethernet address */
      u32   filter[2];  /* Multicast filter. */

      /* Receive and transmit ring base, along with extra bits. */
      u16   rx_ptr;           /* receive descriptor addr */
      u16   rx_len;           /* receive len and high addr */
      u16   tx_ptr;           /* transmit descriptor addr */
      u16   tx_len;           /* transmit len and high addr */

      /* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
      struct lance_rx_desc brx_ring[RX_RING_SIZE];
      struct lance_tx_desc btx_ring[TX_RING_SIZE];

      u8    tx_buf [TX_RING_SIZE][TX_BUFF_SIZE];
      u8    pad[2];           /* align rx_buf for copy_and_sum(). */
      u8    rx_buf [RX_RING_SIZE][RX_BUFF_SIZE];
};

#define libdesc_offset(rt, elem) \
((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem])))))

#define libbuff_offset(rt, elem) \
((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem][0])))))

struct lance_private {
      void __iomem      *lregs;           /* Lance RAP/RDP regs.        */
      void __iomem      *dregs;           /* DMA controller regs.       */
      struct lance_init_block __iomem *init_block_iomem;
      struct lance_init_block *init_block_mem;

      spinlock_t  lock;

      int         rx_new, tx_new;
      int         rx_old, tx_old;

      struct sbus_dma *ledma; /* If set this points to ledma      */
      char        tpe;        /* cable-selection is TPE     */
      char        auto_select;      /* cable-selection by carrier */
      char        burst_sizes;      /* ledma SBus burst sizes     */
      char        pio_buffer; /* init block in PIO space?   */

      unsigned short    busmaster_regval;

      void (*init_ring)(struct net_device *);
      void (*rx)(struct net_device *);
      void (*tx)(struct net_device *);

      char                     *name;
      dma_addr_t        init_block_dvma;
      struct net_device      *dev;          /* Backpointer  */
      struct sbus_dev          *sdev;
      struct timer_list       multicast_timer;
};

#define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
                  lp->tx_old+TX_RING_MOD_MASK-lp->tx_new:\
                  lp->tx_old - lp->tx_new-1)

/* Lance registers. */
#define RDP       0x00UL            /* register data port         */
#define RAP       0x02UL            /* register address port      */
#define LANCE_REG_SIZE  0x04UL

#define STOP_LANCE(__lp) \
do {  void __iomem *__base = (__lp)->lregs; \
      sbus_writew(LE_CSR0,    __base + RAP); \
      sbus_writew(LE_C0_STOP, __base + RDP); \
} while (0)

int sparc_lance_debug = 2;

/* The Lance uses 24 bit addresses */
/* On the Sun4c the DVMA will provide the remaining bytes for us */
/* On the Sun4m we have to instruct the ledma to provide them    */
/* Even worse, on scsi/ether SBUS cards, the init block and the
 * transmit/receive buffers are addresses as offsets from absolute
 * zero on the lebuffer PIO area. -DaveM
 */

#define LANCE_ADDR(x) ((long)(x) & ~0xff000000)

/* Load the CSR registers */
static void load_csrs(struct lance_private *lp)
{
      u32 leptr;

      if (lp->pio_buffer)
            leptr = 0;
      else
            leptr = LANCE_ADDR(lp->init_block_dvma);

      sbus_writew(LE_CSR1,            lp->lregs + RAP);
      sbus_writew(leptr & 0xffff,     lp->lregs + RDP);
      sbus_writew(LE_CSR2,            lp->lregs + RAP);
      sbus_writew(leptr >> 16,        lp->lregs + RDP);
      sbus_writew(LE_CSR3,            lp->lregs + RAP);
      sbus_writew(lp->busmaster_regval, lp->lregs + RDP);

      /* Point back to csr0 */
      sbus_writew(LE_CSR0, lp->lregs + RAP);
}

/* Setup the Lance Rx and Tx rings */
static void lance_init_ring_dvma(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      struct lance_init_block *ib = lp->init_block_mem;
      dma_addr_t aib = lp->init_block_dvma;
      __u32 leptr;
      int i;

      /* Lock out other processes while setting up hardware */
      netif_stop_queue(dev);
      lp->rx_new = lp->tx_new = 0;
      lp->rx_old = lp->tx_old = 0;

      /* Copy the ethernet address to the lance init block
       * Note that on the sparc you need to swap the ethernet address.
       */
      ib->phys_addr [0] = dev->dev_addr [1];
      ib->phys_addr [1] = dev->dev_addr [0];
      ib->phys_addr [2] = dev->dev_addr [3];
      ib->phys_addr [3] = dev->dev_addr [2];
      ib->phys_addr [4] = dev->dev_addr [5];
      ib->phys_addr [5] = dev->dev_addr [4];

      /* Setup the Tx ring entries */
      for (i = 0; i <= TX_RING_SIZE; i++) {
            leptr = LANCE_ADDR(aib + libbuff_offset(tx_buf, i));
            ib->btx_ring [i].tmd0      = leptr;
            ib->btx_ring [i].tmd1_hadr = leptr >> 16;
            ib->btx_ring [i].tmd1_bits = 0;
            ib->btx_ring [i].length    = 0xf000; /* The ones required by tmd2 */
            ib->btx_ring [i].misc      = 0;
      }

      /* Setup the Rx ring entries */
      for (i = 0; i < RX_RING_SIZE; i++) {
            leptr = LANCE_ADDR(aib + libbuff_offset(rx_buf, i));

            ib->brx_ring [i].rmd0      = leptr;
            ib->brx_ring [i].rmd1_hadr = leptr >> 16;
            ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
            ib->brx_ring [i].length    = -RX_BUFF_SIZE | 0xf000;
            ib->brx_ring [i].mblength  = 0;
      }

      /* Setup the initialization block */

      /* Setup rx descriptor pointer */
      leptr = LANCE_ADDR(aib + libdesc_offset(brx_ring, 0));
      ib->rx_len = (LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16);
      ib->rx_ptr = leptr;

      /* Setup tx descriptor pointer */
      leptr = LANCE_ADDR(aib + libdesc_offset(btx_ring, 0));
      ib->tx_len = (LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16);
      ib->tx_ptr = leptr;
}

static void lance_init_ring_pio(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      struct lance_init_block __iomem *ib = lp->init_block_iomem;
      u32 leptr;
      int i;

      /* Lock out other processes while setting up hardware */
      netif_stop_queue(dev);
      lp->rx_new = lp->tx_new = 0;
      lp->rx_old = lp->tx_old = 0;

      /* Copy the ethernet address to the lance init block
       * Note that on the sparc you need to swap the ethernet address.
       */
      sbus_writeb(dev->dev_addr[1], &ib->phys_addr[0]);
      sbus_writeb(dev->dev_addr[0], &ib->phys_addr[1]);
      sbus_writeb(dev->dev_addr[3], &ib->phys_addr[2]);
      sbus_writeb(dev->dev_addr[2], &ib->phys_addr[3]);
      sbus_writeb(dev->dev_addr[5], &ib->phys_addr[4]);
      sbus_writeb(dev->dev_addr[4], &ib->phys_addr[5]);

      /* Setup the Tx ring entries */
      for (i = 0; i <= TX_RING_SIZE; i++) {
            leptr = libbuff_offset(tx_buf, i);
            sbus_writew(leptr,      &ib->btx_ring [i].tmd0);
            sbus_writeb(leptr >> 16,&ib->btx_ring [i].tmd1_hadr);
            sbus_writeb(0,          &ib->btx_ring [i].tmd1_bits);

            /* The ones required by tmd2 */
            sbus_writew(0xf000,     &ib->btx_ring [i].length);
            sbus_writew(0,          &ib->btx_ring [i].misc);
      }

      /* Setup the Rx ring entries */
      for (i = 0; i < RX_RING_SIZE; i++) {
            leptr = libbuff_offset(rx_buf, i);

            sbus_writew(leptr,      &ib->brx_ring [i].rmd0);
            sbus_writeb(leptr >> 16,&ib->brx_ring [i].rmd1_hadr);
            sbus_writeb(LE_R1_OWN,  &ib->brx_ring [i].rmd1_bits);
            sbus_writew(-RX_BUFF_SIZE|0xf000,
                      &ib->brx_ring [i].length);
            sbus_writew(0,          &ib->brx_ring [i].mblength);
      }

      /* Setup the initialization block */

      /* Setup rx descriptor pointer */
      leptr = libdesc_offset(brx_ring, 0);
      sbus_writew((LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16),
                &ib->rx_len);
      sbus_writew(leptr, &ib->rx_ptr);

      /* Setup tx descriptor pointer */
      leptr = libdesc_offset(btx_ring, 0);
      sbus_writew((LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16),
                &ib->tx_len);
      sbus_writew(leptr, &ib->tx_ptr);
}

static void init_restart_ledma(struct lance_private *lp)
{
      u32 csr = sbus_readl(lp->dregs + DMA_CSR);

      if (!(csr & DMA_HNDL_ERROR)) {
            /* E-Cache draining */
            while (sbus_readl(lp->dregs + DMA_CSR) & DMA_FIFO_ISDRAIN)
                  barrier();
      }

      csr = sbus_readl(lp->dregs + DMA_CSR);
      csr &= ~DMA_E_BURSTS;
      if (lp->burst_sizes & DMA_BURST32)
            csr |= DMA_E_BURST32;
      else
            csr |= DMA_E_BURST16;

      csr |= (DMA_DSBL_RD_DRN | DMA_DSBL_WR_INV | DMA_FIFO_INV);

      if (lp->tpe)
            csr |= DMA_EN_ENETAUI;
      else
            csr &= ~DMA_EN_ENETAUI;
      udelay(20);
      sbus_writel(csr, lp->dregs + DMA_CSR);
      udelay(200);
}

static int init_restart_lance(struct lance_private *lp)
{
      u16 regval = 0;
      int i;

      if (lp->dregs)
            init_restart_ledma(lp);

      sbus_writew(LE_CSR0,    lp->lregs + RAP);
      sbus_writew(LE_C0_INIT, lp->lregs + RDP);

      /* Wait for the lance to complete initialization */
      for (i = 0; i < 100; i++) {
            regval = sbus_readw(lp->lregs + RDP);

            if (regval & (LE_C0_ERR | LE_C0_IDON))
                  break;
            barrier();
      }
      if (i == 100 || (regval & LE_C0_ERR)) {
            printk(KERN_ERR "LANCE unopened after %d ticks, csr0=%4.4x.\n",
                   i, regval);
            if (lp->dregs)
                  printk("dcsr=%8.8x\n", sbus_readl(lp->dregs + DMA_CSR));
            return -1;
      }

      /* Clear IDON by writing a "1", enable interrupts and start lance */
      sbus_writew(LE_C0_IDON,             lp->lregs + RDP);
      sbus_writew(LE_C0_INEA | LE_C0_STRT,      lp->lregs + RDP);

      if (lp->dregs) {
            u32 csr = sbus_readl(lp->dregs + DMA_CSR);

            csr |= DMA_INT_ENAB;
            sbus_writel(csr, lp->dregs + DMA_CSR);
      }

      return 0;
}

static void lance_rx_dvma(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      struct lance_init_block *ib = lp->init_block_mem;
      struct lance_rx_desc *rd;
      u8 bits;
      int len, entry = lp->rx_new;
      struct sk_buff *skb;

      for (rd = &ib->brx_ring [entry];
           !((bits = rd->rmd1_bits) & LE_R1_OWN);
           rd = &ib->brx_ring [entry]) {

            /* We got an incomplete frame? */
            if ((bits & LE_R1_POK) != LE_R1_POK) {
                  dev->stats.rx_over_errors++;
                  dev->stats.rx_errors++;
            } else if (bits & LE_R1_ERR) {
                  /* Count only the end frame as a rx error,
                   * not the beginning
                   */
                  if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
                  if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
                  if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
                  if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
                  if (bits & LE_R1_EOP) dev->stats.rx_errors++;
            } else {
                  len = (rd->mblength & 0xfff) - 4;
                  skb = dev_alloc_skb(len + 2);

                  if (skb == NULL) {
                        printk(KERN_INFO "%s: Memory squeeze, deferring packet.\n",
                               dev->name);
                        dev->stats.rx_dropped++;
                        rd->mblength = 0;
                        rd->rmd1_bits = LE_R1_OWN;
                        lp->rx_new = RX_NEXT(entry);
                        return;
                  }

                  dev->stats.rx_bytes += len;

                  skb_reserve(skb, 2);          /* 16 byte align */
                  skb_put(skb, len);            /* make room */
                  skb_copy_to_linear_data(skb,
                               (unsigned char *)&(ib->rx_buf [entry][0]),
                               len);
                  skb->protocol = eth_type_trans(skb, dev);
                  netif_rx(skb);
                  dev->last_rx = jiffies;
                  dev->stats.rx_packets++;
            }

            /* Return the packet to the pool */
            rd->mblength = 0;
            rd->rmd1_bits = LE_R1_OWN;
            entry = RX_NEXT(entry);
      }

      lp->rx_new = entry;
}

static void lance_tx_dvma(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      struct lance_init_block *ib = lp->init_block_mem;
      int i, j;

      spin_lock(&lp->lock);

      j = lp->tx_old;
      for (i = j; i != lp->tx_new; i = j) {
            struct lance_tx_desc *td = &ib->btx_ring [i];
            u8 bits = td->tmd1_bits;

            /* If we hit a packet not owned by us, stop */
            if (bits & LE_T1_OWN)
                  break;

            if (bits & LE_T1_ERR) {
                  u16 status = td->misc;

                  dev->stats.tx_errors++;
                  if (status & LE_T3_RTY)  dev->stats.tx_aborted_errors++;
                  if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;

                  if (status & LE_T3_CLOS) {
                        dev->stats.tx_carrier_errors++;
                        if (lp->auto_select) {
                              lp->tpe = 1 - lp->tpe;
                              printk(KERN_NOTICE "%s: Carrier Lost, trying %s\n",
                                     dev->name, lp->tpe?"TPE":"AUI");
                              STOP_LANCE(lp);
                              lp->init_ring(dev);
                              load_csrs(lp);
                              init_restart_lance(lp);
                              goto out;
                        }
                  }

                  /* Buffer errors and underflows turn off the
                   * transmitter, restart the adapter.
                   */
                  if (status & (LE_T3_BUF|LE_T3_UFL)) {
                        dev->stats.tx_fifo_errors++;

                        printk(KERN_ERR "%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
                               dev->name);
                        STOP_LANCE(lp);
                        lp->init_ring(dev);
                        load_csrs(lp);
                        init_restart_lance(lp);
                        goto out;
                  }
            } else if ((bits & LE_T1_POK) == LE_T1_POK) {
                  /*
                   * So we don't count the packet more than once.
                   */
                  td->tmd1_bits = bits & ~(LE_T1_POK);

                  /* One collision before packet was sent. */
                  if (bits & LE_T1_EONE)
                        dev->stats.collisions++;

                  /* More than one collision, be optimistic. */
                  if (bits & LE_T1_EMORE)
                        dev->stats.collisions += 2;

                  dev->stats.tx_packets++;
            }

            j = TX_NEXT(j);
      }
      lp->tx_old = j;
out:
      if (netif_queue_stopped(dev) &&
          TX_BUFFS_AVAIL > 0)
            netif_wake_queue(dev);

      spin_unlock(&lp->lock);
}

static void lance_piocopy_to_skb(struct sk_buff *skb, void __iomem *piobuf, int len)
{
      u16 *p16 = (u16 *) skb->data;
      u32 *p32;
      u8 *p8;
      void __iomem *pbuf = piobuf;

      /* We know here that both src and dest are on a 16bit boundary. */
      *p16++ = sbus_readw(pbuf);
      p32 = (u32 *) p16;
      pbuf += 2;
      len -= 2;

      while (len >= 4) {
            *p32++ = sbus_readl(pbuf);
            pbuf += 4;
            len -= 4;
      }
      p8 = (u8 *) p32;
      if (len >= 2) {
            p16 = (u16 *) p32;
            *p16++ = sbus_readw(pbuf);
            pbuf += 2;
            len -= 2;
            p8 = (u8 *) p16;
      }
      if (len >= 1)
            *p8 = sbus_readb(pbuf);
}

static void lance_rx_pio(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      struct lance_init_block __iomem *ib = lp->init_block_iomem;
      struct lance_rx_desc __iomem *rd;
      unsigned char bits;
      int len, entry;
      struct sk_buff *skb;

      entry = lp->rx_new;
      for (rd = &ib->brx_ring [entry];
           !((bits = sbus_readb(&rd->rmd1_bits)) & LE_R1_OWN);
           rd = &ib->brx_ring [entry]) {

            /* We got an incomplete frame? */
            if ((bits & LE_R1_POK) != LE_R1_POK) {
                  dev->stats.rx_over_errors++;
                  dev->stats.rx_errors++;
            } else if (bits & LE_R1_ERR) {
                  /* Count only the end frame as a rx error,
                   * not the beginning
                   */
                  if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
                  if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
                  if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
                  if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
                  if (bits & LE_R1_EOP) dev->stats.rx_errors++;
            } else {
                  len = (sbus_readw(&rd->mblength) & 0xfff) - 4;
                  skb = dev_alloc_skb(len + 2);

                  if (skb == NULL) {
                        printk(KERN_INFO "%s: Memory squeeze, deferring packet.\n",
                               dev->name);
                        dev->stats.rx_dropped++;
                        sbus_writew(0, &rd->mblength);
                        sbus_writeb(LE_R1_OWN, &rd->rmd1_bits);
                        lp->rx_new = RX_NEXT(entry);
                        return;
                  }

                  dev->stats.rx_bytes += len;

                  skb_reserve (skb, 2);         /* 16 byte align */
                  skb_put(skb, len);            /* make room */
                  lance_piocopy_to_skb(skb, &(ib->rx_buf[entry][0]), len);
                  skb->protocol = eth_type_trans(skb, dev);
                  netif_rx(skb);
                  dev->last_rx = jiffies;
                  dev->stats.rx_packets++;
            }

            /* Return the packet to the pool */
            sbus_writew(0, &rd->mblength);
            sbus_writeb(LE_R1_OWN, &rd->rmd1_bits);
            entry = RX_NEXT(entry);
      }

      lp->rx_new = entry;
}

static void lance_tx_pio(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      struct lance_init_block __iomem *ib = lp->init_block_iomem;
      int i, j;

      spin_lock(&lp->lock);

      j = lp->tx_old;
      for (i = j; i != lp->tx_new; i = j) {
            struct lance_tx_desc __iomem *td = &ib->btx_ring [i];
            u8 bits = sbus_readb(&td->tmd1_bits);

            /* If we hit a packet not owned by us, stop */
            if (bits & LE_T1_OWN)
                  break;

            if (bits & LE_T1_ERR) {
                  u16 status = sbus_readw(&td->misc);

                  dev->stats.tx_errors++;
                  if (status & LE_T3_RTY)  dev->stats.tx_aborted_errors++;
                  if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;

                  if (status & LE_T3_CLOS) {
                        dev->stats.tx_carrier_errors++;
                        if (lp->auto_select) {
                              lp->tpe = 1 - lp->tpe;
                              printk(KERN_NOTICE "%s: Carrier Lost, trying %s\n",
                                     dev->name, lp->tpe?"TPE":"AUI");
                              STOP_LANCE(lp);
                              lp->init_ring(dev);
                              load_csrs(lp);
                              init_restart_lance(lp);
                              goto out;
                        }
                  }

                  /* Buffer errors and underflows turn off the
                   * transmitter, restart the adapter.
                   */
                  if (status & (LE_T3_BUF|LE_T3_UFL)) {
                        dev->stats.tx_fifo_errors++;

                        printk(KERN_ERR "%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
                               dev->name);
                        STOP_LANCE(lp);
                        lp->init_ring(dev);
                        load_csrs(lp);
                        init_restart_lance(lp);
                        goto out;
                  }
            } else if ((bits & LE_T1_POK) == LE_T1_POK) {
                  /*
                   * So we don't count the packet more than once.
                   */
                  sbus_writeb(bits & ~(LE_T1_POK), &td->tmd1_bits);

                  /* One collision before packet was sent. */
                  if (bits & LE_T1_EONE)
                        dev->stats.collisions++;

                  /* More than one collision, be optimistic. */
                  if (bits & LE_T1_EMORE)
                        dev->stats.collisions += 2;

                  dev->stats.tx_packets++;
            }

            j = TX_NEXT(j);
      }
      lp->tx_old = j;

      if (netif_queue_stopped(dev) &&
          TX_BUFFS_AVAIL > 0)
            netif_wake_queue(dev);
out:
      spin_unlock(&lp->lock);
}

static irqreturn_t lance_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      struct lance_private *lp = netdev_priv(dev);
      int csr0;

      sbus_writew(LE_CSR0, lp->lregs + RAP);
      csr0 = sbus_readw(lp->lregs + RDP);

      /* Acknowledge all the interrupt sources ASAP */
      sbus_writew(csr0 & (LE_C0_INTR | LE_C0_TINT | LE_C0_RINT),
                lp->lregs + RDP);

      if ((csr0 & LE_C0_ERR) != 0) {
            /* Clear the error condition */
            sbus_writew((LE_C0_BABL | LE_C0_ERR | LE_C0_MISS |
                       LE_C0_CERR | LE_C0_MERR),
                      lp->lregs + RDP);
      }

      if (csr0 & LE_C0_RINT)
            lp->rx(dev);

      if (csr0 & LE_C0_TINT)
            lp->tx(dev);

      if (csr0 & LE_C0_BABL)
            dev->stats.tx_errors++;

      if (csr0 & LE_C0_MISS)
            dev->stats.rx_errors++;

      if (csr0 & LE_C0_MERR) {
            if (lp->dregs) {
                  u32 addr = sbus_readl(lp->dregs + DMA_ADDR);

                  printk(KERN_ERR "%s: Memory error, status %04x, addr %06x\n",
                         dev->name, csr0, addr & 0xffffff);
            } else {
                  printk(KERN_ERR "%s: Memory error, status %04x\n",
                         dev->name, csr0);
            }

            sbus_writew(LE_C0_STOP, lp->lregs + RDP);

            if (lp->dregs) {
                  u32 dma_csr = sbus_readl(lp->dregs + DMA_CSR);

                  dma_csr |= DMA_FIFO_INV;
                  sbus_writel(dma_csr, lp->dregs + DMA_CSR);
            }

            lp->init_ring(dev);
            load_csrs(lp);
            init_restart_lance(lp);
            netif_wake_queue(dev);
      }

      sbus_writew(LE_C0_INEA, lp->lregs + RDP);

      return IRQ_HANDLED;
}

/* Build a fake network packet and send it to ourselves. */
static void build_fake_packet(struct lance_private *lp)
{
      struct net_device *dev = lp->dev;
      int i, entry;

      entry = lp->tx_new & TX_RING_MOD_MASK;
      if (lp->pio_buffer) {
            struct lance_init_block __iomem *ib = lp->init_block_iomem;
            u16 __iomem *packet = (u16 __iomem *) &(ib->tx_buf[entry][0]);
            struct ethhdr __iomem *eth = (struct ethhdr __iomem *) packet;
            for (i = 0; i < (ETH_ZLEN / sizeof(u16)); i++)
                  sbus_writew(0, &packet[i]);
            for (i = 0; i < 6; i++) {
                  sbus_writeb(dev->dev_addr[i], &eth->h_dest[i]);
                  sbus_writeb(dev->dev_addr[i], &eth->h_source[i]);
            }
            sbus_writew((-ETH_ZLEN) | 0xf000, &ib->btx_ring[entry].length);
            sbus_writew(0, &ib->btx_ring[entry].misc);
            sbus_writeb(LE_T1_POK|LE_T1_OWN, &ib->btx_ring[entry].tmd1_bits);
      } else {
            struct lance_init_block *ib = lp->init_block_mem;
            u16 *packet = (u16 *) &(ib->tx_buf[entry][0]);
            struct ethhdr *eth = (struct ethhdr *) packet;
            memset(packet, 0, ETH_ZLEN);
            for (i = 0; i < 6; i++) {
                  eth->h_dest[i] = dev->dev_addr[i];
                  eth->h_source[i] = dev->dev_addr[i];
            }
            ib->btx_ring[entry].length = (-ETH_ZLEN) | 0xf000;
            ib->btx_ring[entry].misc = 0;
            ib->btx_ring[entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
      }
      lp->tx_new = TX_NEXT(entry);
}

struct net_device *last_dev;

static int lance_open(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      int status = 0;

      last_dev = dev;

      STOP_LANCE(lp);

      if (request_irq(dev->irq, &lance_interrupt, IRQF_SHARED,
                  lancestr, (void *) dev)) {
            printk(KERN_ERR "Lance: Can't get irq %d\n", dev->irq);
            return -EAGAIN;
      }

      /* On the 4m, setup the ledma to provide the upper bits for buffers */
      if (lp->dregs) {
            u32 regval = lp->init_block_dvma & 0xff000000;

            sbus_writel(regval, lp->dregs + DMA_TEST);
      }

      /* Set mode and clear multicast filter only at device open,
       * so that lance_init_ring() called at any error will not
       * forget multicast filters.
       *
       * BTW it is common bug in all lance drivers! --ANK
       */
      if (lp->pio_buffer) {
            struct lance_init_block __iomem *ib = lp->init_block_iomem;
            sbus_writew(0, &ib->mode);
            sbus_writel(0, &ib->filter[0]);
            sbus_writel(0, &ib->filter[1]);
      } else {
            struct lance_init_block *ib = lp->init_block_mem;
            ib->mode = 0;
            ib->filter [0] = 0;
            ib->filter [1] = 0;
      }

      lp->init_ring(dev);
      load_csrs(lp);

      netif_start_queue(dev);

      status = init_restart_lance(lp);
      if (!status && lp->auto_select) {
            build_fake_packet(lp);
            sbus_writew(LE_C0_INEA | LE_C0_TDMD, lp->lregs + RDP);
      }

      return status;
}

static int lance_close(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);

      netif_stop_queue(dev);
      del_timer_sync(&lp->multicast_timer);

      STOP_LANCE(lp);

      free_irq(dev->irq, (void *) dev);
      return 0;
}

static int lance_reset(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      int status;

      STOP_LANCE(lp);

      /* On the 4m, reset the dma too */
      if (lp->dregs) {
            u32 csr, addr;

            printk(KERN_ERR "resetting ledma\n");
            csr = sbus_readl(lp->dregs + DMA_CSR);
            sbus_writel(csr | DMA_RST_ENET, lp->dregs + DMA_CSR);
            udelay(200);
            sbus_writel(csr & ~DMA_RST_ENET, lp->dregs + DMA_CSR);

            addr = lp->init_block_dvma & 0xff000000;
            sbus_writel(addr, lp->dregs + DMA_TEST);
      }
      lp->init_ring(dev);
      load_csrs(lp);
      dev->trans_start = jiffies;
      status = init_restart_lance(lp);
      return status;
}

static void lance_piocopy_from_skb(void __iomem *dest, unsigned char *src, int len)
{
      void __iomem *piobuf = dest;
      u32 *p32;
      u16 *p16;
      u8 *p8;

      switch ((unsigned long)src & 0x3) {
      case 0:
            p32 = (u32 *) src;
            while (len >= 4) {
                  sbus_writel(*p32, piobuf);
                  p32++;
                  piobuf += 4;
                  len -= 4;
            }
            src = (char *) p32;
            break;
      case 1:
      case 3:
            p8 = (u8 *) src;
            while (len >= 4) {
                  u32 val;

                  val  = p8[0] << 24;
                  val |= p8[1] << 16;
                  val |= p8[2] << 8;
                  val |= p8[3];
                  sbus_writel(val, piobuf);
                  p8 += 4;
                  piobuf += 4;
                  len -= 4;
            }
            src = (char *) p8;
            break;
      case 2:
            p16 = (u16 *) src;
            while (len >= 4) {
                  u32 val = p16[0]<<16 | p16[1];
                  sbus_writel(val, piobuf);
                  p16 += 2;
                  piobuf += 4;
                  len -= 4;
            }
            src = (char *) p16;
            break;
      };
      if (len >= 2) {
            u16 val = src[0] << 8 | src[1];
            sbus_writew(val, piobuf);
            src += 2;
            piobuf += 2;
            len -= 2;
      }
      if (len >= 1)
            sbus_writeb(src[0], piobuf);
}

static void lance_piozero(void __iomem *dest, int len)
{
      void __iomem *piobuf = dest;

      if ((unsigned long)piobuf & 1) {
            sbus_writeb(0, piobuf);
            piobuf += 1;
            len -= 1;
            if (len == 0)
                  return;
      }
      if (len == 1) {
            sbus_writeb(0, piobuf);
            return;
      }
      if ((unsigned long)piobuf & 2) {
            sbus_writew(0, piobuf);
            piobuf += 2;
            len -= 2;
            if (len == 0)
                  return;
      }
      while (len >= 4) {
            sbus_writel(0, piobuf);
            piobuf += 4;
            len -= 4;
      }
      if (len >= 2) {
            sbus_writew(0, piobuf);
            piobuf += 2;
            len -= 2;
      }
      if (len >= 1)
            sbus_writeb(0, piobuf);
}

static void lance_tx_timeout(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);

      printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
             dev->name, sbus_readw(lp->lregs + RDP));
      lance_reset(dev);
      netif_wake_queue(dev);
}

static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      int entry, skblen, len;

      skblen = skb->len;

      len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;

      spin_lock_irq(&lp->lock);

      dev->stats.tx_bytes += len;

      entry = lp->tx_new & TX_RING_MOD_MASK;
      if (lp->pio_buffer) {
            struct lance_init_block __iomem *ib = lp->init_block_iomem;
            sbus_writew((-len) | 0xf000, &ib->btx_ring[entry].length);
            sbus_writew(0, &ib->btx_ring[entry].misc);
            lance_piocopy_from_skb(&ib->tx_buf[entry][0], skb->data, skblen);
            if (len != skblen)
                  lance_piozero(&ib->tx_buf[entry][skblen], len - skblen);
            sbus_writeb(LE_T1_POK | LE_T1_OWN, &ib->btx_ring[entry].tmd1_bits);
      } else {
            struct lance_init_block *ib = lp->init_block_mem;
            ib->btx_ring [entry].length = (-len) | 0xf000;
            ib->btx_ring [entry].misc = 0;
            skb_copy_from_linear_data(skb, &ib->tx_buf [entry][0], skblen);
            if (len != skblen)
                  memset((char *) &ib->tx_buf [entry][skblen], 0, len - skblen);
            ib->btx_ring [entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
      }

      lp->tx_new = TX_NEXT(entry);

      if (TX_BUFFS_AVAIL <= 0)
            netif_stop_queue(dev);

      /* Kick the lance: transmit now */
      sbus_writew(LE_C0_INEA | LE_C0_TDMD, lp->lregs + RDP);

      /* Read back CSR to invalidate the E-Cache.
       * This is needed, because DMA_DSBL_WR_INV is set.
       */
      if (lp->dregs)
            sbus_readw(lp->lregs + RDP);

      spin_unlock_irq(&lp->lock);

      dev->trans_start = jiffies;
      dev_kfree_skb(skb);

      return 0;
}

/* taken from the depca driver */
static void lance_load_multicast(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      struct dev_mc_list *dmi = dev->mc_list;
      char *addrs;
      int i;
      u32 crc;
      u32 val;

      /* set all multicast bits */
      if (dev->flags & IFF_ALLMULTI)
            val = ~0;
      else
            val = 0;

      if (lp->pio_buffer) {
            struct lance_init_block __iomem *ib = lp->init_block_iomem;
            sbus_writel(val, &ib->filter[0]);
            sbus_writel(val, &ib->filter[1]);
      } else {
            struct lance_init_block *ib = lp->init_block_mem;
            ib->filter [0] = val;
            ib->filter [1] = val;
      }

      if (dev->flags & IFF_ALLMULTI)
            return;

      /* Add addresses */
      for (i = 0; i < dev->mc_count; i++) {
            addrs = dmi->dmi_addr;
            dmi   = dmi->next;

            /* multicast address? */
            if (!(*addrs & 1))
                  continue;
            crc = ether_crc_le(6, addrs);
            crc = crc >> 26;
            if (lp->pio_buffer) {
                  struct lance_init_block __iomem *ib = lp->init_block_iomem;
                  u16 __iomem *mcast_table = (u16 __iomem *) &ib->filter;
                  u16 tmp = sbus_readw(&mcast_table[crc>>4]);
                  tmp |= 1 << (crc & 0xf);
                  sbus_writew(tmp, &mcast_table[crc>>4]);
            } else {
                  struct lance_init_block *ib = lp->init_block_mem;
                  u16 *mcast_table = (u16 *) &ib->filter;
                  mcast_table [crc >> 4] |= 1 << (crc & 0xf);
            }
      }
}

static void lance_set_multicast(struct net_device *dev)
{
      struct lance_private *lp = netdev_priv(dev);
      struct lance_init_block *ib_mem = lp->init_block_mem;
      struct lance_init_block __iomem *ib_iomem = lp->init_block_iomem;
      u16 mode;

      if (!netif_running(dev))
            return;

      if (lp->tx_old != lp->tx_new) {
            mod_timer(&lp->multicast_timer, jiffies + 4);
            netif_wake_queue(dev);
            return;
      }

      netif_stop_queue(dev);

      STOP_LANCE(lp);
      lp->init_ring(dev);

      if (lp->pio_buffer)
            mode = sbus_readw(&ib_iomem->mode);
      else
            mode = ib_mem->mode;
      if (dev->flags & IFF_PROMISC) {
            mode |= LE_MO_PROM;
            if (lp->pio_buffer)
                  sbus_writew(mode, &ib_iomem->mode);
            else
                  ib_mem->mode = mode;
      } else {
            mode &= ~LE_MO_PROM;
            if (lp->pio_buffer)
                  sbus_writew(mode, &ib_iomem->mode);
            else
                  ib_mem->mode = mode;
            lance_load_multicast(dev);
      }
      load_csrs(lp);
      init_restart_lance(lp);
      netif_wake_queue(dev);
}

static void lance_set_multicast_retry(unsigned long _opaque)
{
      struct net_device *dev = (struct net_device *) _opaque;

      lance_set_multicast(dev);
}

static void lance_free_hwresources(struct lance_private *lp)
{
      if (lp->lregs)
            sbus_iounmap(lp->lregs, LANCE_REG_SIZE);
      if (lp->init_block_iomem) {
            sbus_iounmap(lp->init_block_iomem,
                       sizeof(struct lance_init_block));
      } else if (lp->init_block_mem) {
            sbus_free_consistent(lp->sdev,
                             sizeof(struct lance_init_block),
                             lp->init_block_mem,
                             lp->init_block_dvma);
      }
}

/* Ethtool support... */
static void sparc_lance_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
      struct lance_private *lp = netdev_priv(dev);

      strcpy(info->driver, "sunlance");
      strcpy(info->version, "2.02");
      sprintf(info->bus_info, "SBUS:%d",
            lp->sdev->slot);
}

static u32 sparc_lance_get_link(struct net_device *dev)
{
      /* We really do not keep track of this, but this
       * is better than not reporting anything at all.
       */
      return 1;
}

static const struct ethtool_ops sparc_lance_ethtool_ops = {
      .get_drvinfo            = sparc_lance_get_drvinfo,
      .get_link         = sparc_lance_get_link,
};

static int __devinit sparc_lance_probe_one(struct sbus_dev *sdev,
                                 struct sbus_dma *ledma,
                                 struct sbus_dev *lebuffer)
{
      static unsigned version_printed;
      struct device_node *dp = sdev->ofdev.node;
      struct net_device *dev;
      struct lance_private *lp;
      int    i;
      DECLARE_MAC_BUF(mac);

      dev = alloc_etherdev(sizeof(struct lance_private) + 8);
      if (!dev)
            return -ENOMEM;

      lp = netdev_priv(dev);

      if (sparc_lance_debug && version_printed++ == 0)
            printk (KERN_INFO "%s", version);

      spin_lock_init(&lp->lock);

      /* Copy the IDPROM ethernet address to the device structure, later we
       * will copy the address in the device structure to the lance
       * initialization block.
       */
      for (i = 0; i < 6; i++)
            dev->dev_addr[i] = idprom->id_ethaddr[i];

      /* Get the IO region */
      lp->lregs = sbus_ioremap(&sdev->resource[0], 0,
                         LANCE_REG_SIZE, lancestr);
      if (!lp->lregs) {
            printk(KERN_ERR "SunLance: Cannot map registers.\n");
            goto fail;
      }

      lp->sdev = sdev;
      if (lebuffer) {
            /* sanity check */
            if (lebuffer->resource[0].start & 7) {
                  printk(KERN_ERR "SunLance: ERROR: Rx and Tx rings not on even boundary.\n");
                  goto fail;
            }
            lp->init_block_iomem =
                  sbus_ioremap(&lebuffer->resource[0], 0,
                             sizeof(struct lance_init_block), "lebuffer");
            if (!lp->init_block_iomem) {
                  printk(KERN_ERR "SunLance: Cannot map PIO buffer.\n");
                  goto fail;
            }
            lp->init_block_dvma = 0;
            lp->pio_buffer = 1;
            lp->init_ring = lance_init_ring_pio;
            lp->rx = lance_rx_pio;
            lp->tx = lance_tx_pio;
      } else {
            lp->init_block_mem =
                  sbus_alloc_consistent(sdev, sizeof(struct lance_init_block),
                                    &lp->init_block_dvma);
            if (!lp->init_block_mem || lp->init_block_dvma == 0) {
                  printk(KERN_ERR "SunLance: Cannot allocate consistent DMA memory.\n");
                  goto fail;
            }
            lp->pio_buffer = 0;
            lp->init_ring = lance_init_ring_dvma;
            lp->rx = lance_rx_dvma;
            lp->tx = lance_tx_dvma;
      }
      lp->busmaster_regval = of_getintprop_default(dp,  "busmaster-regval",
                                         (LE_C3_BSWP |
                                          LE_C3_ACON |
                                          LE_C3_BCON));

      lp->name = lancestr;
      lp->ledma = ledma;

      lp->burst_sizes = 0;
      if (lp->ledma) {
            struct device_node *ledma_dp = ledma->sdev->ofdev.node;
            const char *prop;
            unsigned int sbmask;
            u32 csr;

            /* Find burst-size property for ledma */
            lp->burst_sizes = of_getintprop_default(ledma_dp,
                                          "burst-sizes", 0);

            /* ledma may be capable of fast bursts, but sbus may not. */
            sbmask = of_getintprop_default(ledma_dp, "burst-sizes",
                                     DMA_BURSTBITS);
            lp->burst_sizes &= sbmask;

            /* Get the cable-selection property */
            prop = of_get_property(ledma_dp, "cable-selection", NULL);
            if (!prop || prop[0] == '\0') {
                  struct device_node *nd;

                  printk(KERN_INFO "SunLance: using "
                         "auto-carrier-detection.\n");

                  nd = of_find_node_by_path("/options");
                  if (!nd)
                        goto no_link_test;

                  prop = of_get_property(nd, "tpe-link-test?", NULL);
                  if (!prop)
                        goto no_link_test;

                  if (strcmp(prop, "true")) {
                        printk(KERN_NOTICE "SunLance: warning: overriding option "
                               "'tpe-link-test?'\n");
                        printk(KERN_NOTICE "SunLance: warning: mail any problems "
                               "to ecd@skynet.be\n");
                        auxio_set_lte(AUXIO_LTE_ON);
                  }
no_link_test:
                  lp->auto_select = 1;
                  lp->tpe = 0;
            } else if (!strcmp(prop, "aui")) {
                  lp->auto_select = 0;
                  lp->tpe = 0;
            } else {
                  lp->auto_select = 0;
                  lp->tpe = 1;
            }

            lp->dregs = ledma->regs;

            /* Reset ledma */
            csr = sbus_readl(lp->dregs + DMA_CSR);
            sbus_writel(csr | DMA_RST_ENET, lp->dregs + DMA_CSR);
            udelay(200);
            sbus_writel(csr & ~DMA_RST_ENET, lp->dregs + DMA_CSR);
      } else
            lp->dregs = NULL;

      lp->dev = dev;
      SET_NETDEV_DEV(dev, &sdev->ofdev.dev);
      dev->open = &lance_open;
      dev->stop = &lance_close;
      dev->hard_start_xmit = &lance_start_xmit;
      dev->tx_timeout = &lance_tx_timeout;
      dev->watchdog_timeo = 5*HZ;
      dev->set_multicast_list = &lance_set_multicast;
      dev->ethtool_ops = &sparc_lance_ethtool_ops;

      dev->irq = sdev->irqs[0];

      dev->dma = 0;

      /* We cannot sleep if the chip is busy during a
       * multicast list update event, because such events
       * can occur from interrupts (ex. IPv6).  So we
       * use a timer to try again later when necessary. -DaveM
       */
      init_timer(&lp->multicast_timer);
      lp->multicast_timer.data = (unsigned long) dev;
      lp->multicast_timer.function = &lance_set_multicast_retry;

      if (register_netdev(dev)) {
            printk(KERN_ERR "SunLance: Cannot register device.\n");
            goto fail;
      }

      dev_set_drvdata(&sdev->ofdev.dev, lp);

      printk(KERN_INFO "%s: LANCE %s\n",
             dev->name, print_mac(mac, dev->dev_addr));

      return 0;

fail:
      lance_free_hwresources(lp);
      free_netdev(dev);
      return -ENODEV;
}

/* On 4m, find the associated dma for the lance chip */
static struct sbus_dma * __devinit find_ledma(struct sbus_dev *sdev)
{
      struct sbus_dma *p;

      for_each_dvma(p) {
            if (p->sdev == sdev)
                  return p;
      }
      return NULL;
}

#ifdef CONFIG_SUN4

#include <asm/sun4paddr.h>
#include <asm/machines.h>

/* Find all the lance cards on the system and initialize them */
static struct sbus_dev sun4_sdev;
static int __devinit sparc_lance_init(void)
{
      if ((idprom->id_machtype == (SM_SUN4|SM_4_330)) ||
          (idprom->id_machtype == (SM_SUN4|SM_4_470))) {
            memset(&sun4_sdev, 0, sizeof(struct sbus_dev));
            sun4_sdev.reg_addrs[0].phys_addr = sun4_eth_physaddr;
            sun4_sdev.irqs[0] = 6;
            return sparc_lance_probe_one(&sun4_sdev, NULL, NULL);
      }
      return -ENODEV;
}

static int __exit sunlance_sun4_remove(void)
{
      struct lance_private *lp = dev_get_drvdata(&sun4_sdev.ofdev.dev);
      struct net_device *net_dev = lp->dev;

      unregister_netdev(net_dev);

      lance_free_hwresources(lp);

      free_netdev(net_dev);

      dev_set_drvdata(&sun4_sdev.ofdev.dev, NULL);

      return 0;
}

#else /* !CONFIG_SUN4 */

static int __devinit sunlance_sbus_probe(struct of_device *dev, const struct of_device_id *match)
{
      struct sbus_dev *sdev = to_sbus_device(&dev->dev);
      int err;

      if (sdev->parent) {
            struct of_device *parent = &sdev->parent->ofdev;

            if (!strcmp(parent->node->name, "ledma")) {
                  struct sbus_dma *ledma = find_ledma(to_sbus_device(&parent->dev));

                  err = sparc_lance_probe_one(sdev, ledma, NULL);
            } else if (!strcmp(parent->node->name, "lebuffer")) {
                  err = sparc_lance_probe_one(sdev, NULL, to_sbus_device(&parent->dev));
            } else
                  err = sparc_lance_probe_one(sdev, NULL, NULL);
      } else
            err = sparc_lance_probe_one(sdev, NULL, NULL);

      return err;
}

static int __devexit sunlance_sbus_remove(struct of_device *dev)
{
      struct lance_private *lp = dev_get_drvdata(&dev->dev);
      struct net_device *net_dev = lp->dev;

      unregister_netdev(net_dev);

      lance_free_hwresources(lp);

      free_netdev(net_dev);

      dev_set_drvdata(&dev->dev, NULL);

      return 0;
}

static struct of_device_id sunlance_sbus_match[] = {
      {
            .name = "le",
      },
      {},
};

MODULE_DEVICE_TABLE(of, sunlance_sbus_match);

static struct of_platform_driver sunlance_sbus_driver = {
      .name       = "sunlance",
      .match_table      = sunlance_sbus_match,
      .probe            = sunlance_sbus_probe,
      .remove           = __devexit_p(sunlance_sbus_remove),
};


/* Find all the lance cards on the system and initialize them */
static int __init sparc_lance_init(void)
{
      return of_register_driver(&sunlance_sbus_driver, &sbus_bus_type);
}
#endif /* !CONFIG_SUN4 */

static void __exit sparc_lance_exit(void)
{
#ifdef CONFIG_SUN4
      sunlance_sun4_remove();
#else
      of_unregister_driver(&sunlance_sbus_driver);
#endif
}

module_init(sparc_lance_init);
module_exit(sparc_lance_exit);

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