/* $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/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 (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 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) {
                                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) {
                                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);

        netif_trans_update(dev); /* 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)
{
        strlcpy(info->driver, "sunlance", sizeof(info->driver));
        strlcpy(info->version, "2.02", sizeof(info->version));
}

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 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)
                        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 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;
                }

                /* 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 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 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         = sunlance_sbus_remove,
};

module_platform_driver(sunlance_sbus_driver);