sunlance.c

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/* $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 ([email protected])
 *  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
 *        ([email protected])
 *
 *   5/15/96: auto carrier detection on sun4m by Eddie C. Dost
 *        ([email protected])
 *
 *   5/17/96: lebuffer on scsi/ether cards now work David S. Miller
 *        ([email protected])
 *
 *   5/29/96: override option 'tpe-link-test?', if it is 'false', as
 *        this disables auto carrier detection on sun4m. Eddie C. Dost
 *        ([email protected])
 *
 * 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 ([email protected])
 *
 *   9/15/96: Align rx_buf so that eth_copy_and_sum() won't cause an
 *        MNA trap during chksum_partial_copy(). ([email protected])
 *
 *  11/17/96: Handle LE_C0_MERR in lance_interrupt(). ([email protected])
 *
 *  12/22/96: Don't loop forever in lance_rx() on incomplete packets.
 *        This was the sun4c killer. Shit, stupid bug.
 *        ([email protected])
 *
 * 1.10:
 *   1/26/97: Modularize driver. ([email protected])
 *
 * 1.11:
 *  12/27/97: Added sun4d support. ([email protected])
 *
 * 1.12:
 *   11/3/99: Fixed SMP race in lance_start_xmit found by davem.
 *            Anton Blanchard ([email protected])
 * 2.00: 11/9/99: Massive overhaul and port to new SBUS driver interfaces.
 *        David S. Miller ([email protected])
 * 2.01:
 *      11/08/01: Use library crc32 functions ([email protected])
 *
 */

#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/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 <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/gfp.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/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 ([email protected])"

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 platform_device *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 platform_device       *op;
    struct platform_device       *lebuffer;
    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 = netdev_alloc_skb(dev, 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->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 = netdev_alloc_skb(dev, 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->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);
}

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

    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; /* prevent tx timeout */
    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_kfree_skb(skb);

    return NETDEV_TX_OK;
}

/* taken from the depca driver */
static void lance_load_multicast(struct net_device *dev)
{
    struct lance_private *lp = netdev_priv(dev);
    struct netdev_hw_addr *ha;
    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 */
    netdev_for_each_mc_addr(ha, dev) {
        crc = ether_crc_le(6, ha->addr);
        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)
        of_iounmap(&lp->op->resource[0], lp->lregs, LANCE_REG_SIZE);
    if (lp->dregs) {
        struct platform_device *ledma = lp->ledma;

        of_iounmap(&ledma->resource[0], lp->dregs,
               resource_size(&ledma->resource[0]));
    }
    if (lp->init_block_iomem) {
        of_iounmap(&lp->lebuffer->resource[0], lp->init_block_iomem,
               sizeof(struct lance_init_block));
    } else if (lp->init_block_mem) {
        dma_free_coherent(&lp->op->dev,
                  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)
{
    strcpy(info->driver, "sunlance");
    strcpy(info->version, "2.02");
}

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

static const struct net_device_ops sparc_lance_ops = {
    .ndo_open       = lance_open,
    .ndo_stop       = lance_close,
    .ndo_start_xmit     = lance_start_xmit,
    .ndo_set_rx_mode    = lance_set_multicast,
    .ndo_tx_timeout     = lance_tx_timeout,
    .ndo_change_mtu     = eth_change_mtu,
    .ndo_set_mac_address    = eth_mac_addr,
    .ndo_validate_addr  = eth_validate_addr,
};

static int __devinit sparc_lance_probe_one(struct platform_device *op,
                       struct platform_device *ledma,
                       struct platform_device *lebuffer)
{
    struct device_node *dp = op->dev.of_node;
    static unsigned version_printed;
    struct lance_private *lp;
    struct net_device *dev;
    int    i;

    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 = of_ioremap(&op->resource[0], 0,
                   LANCE_REG_SIZE, lancestr);
    if (!lp->lregs) {
        printk(KERN_ERR "SunLance: Cannot map registers.\n");
        goto fail;
    }

    lp->ledma = ledma;
    if (lp->ledma) {
        lp->dregs = of_ioremap(&ledma->resource[0], 0,
                       resource_size(&ledma->resource[0]),
                       "ledma");
        if (!lp->dregs) {
            printk(KERN_ERR "SunLance: Cannot map "
                   "ledma registers.\n");
            goto fail;
        }
    }

    lp->op = op;
    lp->lebuffer = lebuffer;
    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 =
            of_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 =
            dma_alloc_coherent(&op->dev,
                       sizeof(struct lance_init_block),
                       &lp->init_block_dvma, GFP_ATOMIC);
        if (!lp->init_block_mem) {
            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->burst_sizes = 0;
    if (lp->ledma) {
        struct device_node *ledma_dp = ledma->dev.of_node;
        struct device_node *sbus_dp;
        unsigned int sbmask;
        const char *prop;
        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. */
        sbus_dp = ledma_dp->parent;
        sbmask = of_getintprop_default(sbus_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 [email protected]\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;
        }

        /* 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, &op->dev);
    dev->watchdog_timeo = 5*HZ;
    dev->ethtool_ops = &sparc_lance_ethtool_ops;
    dev->netdev_ops = &sparc_lance_ops;

    dev->irq = op->archdata.irqs[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(&op->dev, lp);

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

    return 0;

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

static int __devinit sunlance_sbus_probe(struct platform_device *op)
{
    struct platform_device *parent = to_platform_device(op->dev.parent);
    struct device_node *parent_dp = parent->dev.of_node;
    int err;

    if (!strcmp(parent_dp->name, "ledma")) {
        err = sparc_lance_probe_one(op, parent, NULL);
    } else if (!strcmp(parent_dp->name, "lebuffer")) {
        err = sparc_lance_probe_one(op, NULL, parent);
    } else
        err = sparc_lance_probe_one(op, NULL, NULL);

    return err;
}

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

    unregister_netdev(net_dev);

    lance_free_hwresources(lp);

    free_netdev(net_dev);

    dev_set_drvdata(&op->dev, NULL);

    return 0;
}

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

MODULE_DEVICE_TABLE(of, sunlance_sbus_match);

static struct platform_driver sunlance_sbus_driver = {
    .driver = {
        .name = "sunlance",
        .owner = THIS_MODULE,
        .of_match_table = sunlance_sbus_match,
    },
    .probe      = sunlance_sbus_probe,
    .remove     = __devexit_p(sunlance_sbus_remove),
};

module_platform_driver(sunlance_sbus_driver);