sonic.c

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/*
 * sonic.c
 *
 * (C) 2005 Finn Thain
 *
 * Converted to DMA API, added zero-copy buffer handling, and
 * (from the mac68k project) introduced dhd's support for 16-bit cards.
 *
 * (C) 1996,1998 by Thomas Bogendoerfer ([email protected])
 *
 * This driver is based on work from Andreas Busse, but most of
 * the code is rewritten.
 *
 * (C) 1995 by Andreas Busse ([email protected])
 *
 *    Core code included by system sonic drivers
 *
 * And... partially rewritten again by David Huggins-Daines in order
 * to cope with screwed up Macintosh NICs that may or may not use
 * 16-bit DMA.
 *
 * (C) 1999 David Huggins-Daines <[email protected]>
 *
 */

/*
 * Sources: Olivetti M700-10 Risc Personal Computer hardware handbook,
 * National Semiconductors data sheet for the DP83932B Sonic Ethernet
 * controller, and the files "8390.c" and "skeleton.c" in this directory.
 *
 * Additional sources: Nat Semi data sheet for the DP83932C and Nat Semi
 * Application Note AN-746, the files "lance.c" and "ibmlana.c". See also
 * the NetBSD file "sys/arch/mac68k/dev/if_sn.c".
 */



/*
 * Open/initialize the SONIC controller.
 *
 * This routine should set everything up anew at each open, even
 *  registers that "should" only need to be set once at boot, so that
 *  there is non-reboot way to recover if something goes wrong.
 */
static int sonic_open(struct net_device *dev)
{
    struct sonic_local *lp = netdev_priv(dev);
    int i;

    if (sonic_debug > 2)
        printk("sonic_open: initializing sonic driver.\n");

    for (i = 0; i < SONIC_NUM_RRS; i++) {
        struct sk_buff *skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
        if (skb == NULL) {
            while(i > 0) { /* free any that were allocated successfully */
                i--;
                dev_kfree_skb(lp->rx_skb[i]);
                lp->rx_skb[i] = NULL;
            }
            printk(KERN_ERR "%s: couldn't allocate receive buffers\n",
                   dev->name);
            return -ENOMEM;
        }
        /* align IP header unless DMA requires otherwise */
        if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
            skb_reserve(skb, 2);
        lp->rx_skb[i] = skb;
    }

    for (i = 0; i < SONIC_NUM_RRS; i++) {
        dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
                                          SONIC_RBSIZE, DMA_FROM_DEVICE);
        if (!laddr) {
            while(i > 0) { /* free any that were mapped successfully */
                i--;
                dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
                lp->rx_laddr[i] = (dma_addr_t)0;
            }
            for (i = 0; i < SONIC_NUM_RRS; i++) {
                dev_kfree_skb(lp->rx_skb[i]);
                lp->rx_skb[i] = NULL;
            }
            printk(KERN_ERR "%s: couldn't map rx DMA buffers\n",
                   dev->name);
            return -ENOMEM;
        }
        lp->rx_laddr[i] = laddr;
    }

    /*
     * Initialize the SONIC
     */
    sonic_init(dev);

    netif_start_queue(dev);

    if (sonic_debug > 2)
        printk("sonic_open: Initialization done.\n");

    return 0;
}


/*
 * Close the SONIC device
 */
static int sonic_close(struct net_device *dev)
{
    struct sonic_local *lp = netdev_priv(dev);
    int i;

    if (sonic_debug > 2)
        printk("sonic_close\n");

    netif_stop_queue(dev);

    /*
     * stop the SONIC, disable interrupts
     */
    SONIC_WRITE(SONIC_IMR, 0);
    SONIC_WRITE(SONIC_ISR, 0x7fff);
    SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);

    /* unmap and free skbs that haven't been transmitted */
    for (i = 0; i < SONIC_NUM_TDS; i++) {
        if(lp->tx_laddr[i]) {
            dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
            lp->tx_laddr[i] = (dma_addr_t)0;
        }
        if(lp->tx_skb[i]) {
            dev_kfree_skb(lp->tx_skb[i]);
            lp->tx_skb[i] = NULL;
        }
    }

    /* unmap and free the receive buffers */
    for (i = 0; i < SONIC_NUM_RRS; i++) {
        if(lp->rx_laddr[i]) {
            dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
            lp->rx_laddr[i] = (dma_addr_t)0;
        }
        if(lp->rx_skb[i]) {
            dev_kfree_skb(lp->rx_skb[i]);
            lp->rx_skb[i] = NULL;
        }
    }

    return 0;
}

static void sonic_tx_timeout(struct net_device *dev)
{
    struct sonic_local *lp = netdev_priv(dev);
    int i;
    /*
     * put the Sonic into software-reset mode and
     * disable all interrupts before releasing DMA buffers
     */
    SONIC_WRITE(SONIC_IMR, 0);
    SONIC_WRITE(SONIC_ISR, 0x7fff);
    SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
    /* We could resend the original skbs. Easier to re-initialise. */
    for (i = 0; i < SONIC_NUM_TDS; i++) {
        if(lp->tx_laddr[i]) {
            dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
            lp->tx_laddr[i] = (dma_addr_t)0;
        }
        if(lp->tx_skb[i]) {
            dev_kfree_skb(lp->tx_skb[i]);
            lp->tx_skb[i] = NULL;
        }
    }
    /* Try to restart the adaptor. */
    sonic_init(dev);
    lp->stats.tx_errors++;
    dev->trans_start = jiffies; /* prevent tx timeout */
    netif_wake_queue(dev);
}

/*
 * transmit packet
 *
 * Appends new TD during transmission thus avoiding any TX interrupts
 * until we run out of TDs.
 * This routine interacts closely with the ISR in that it may,
 *   set tx_skb[i]
 *   reset the status flags of the new TD
 *   set and reset EOL flags
 *   stop the tx queue
 * The ISR interacts with this routine in various ways. It may,
 *   reset tx_skb[i]
 *   test the EOL and status flags of the TDs
 *   wake the tx queue
 * Concurrently with all of this, the SONIC is potentially writing to
 * the status flags of the TDs.
 * Until some mutual exclusion is added, this code will not work with SMP. However,
 * MIPS Jazz machines and m68k Macs were all uni-processor machines.
 */

static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
{
    struct sonic_local *lp = netdev_priv(dev);
    dma_addr_t laddr;
    int length;
    int entry = lp->next_tx;

    if (sonic_debug > 2)
        printk("sonic_send_packet: skb=%p, dev=%p\n", skb, dev);

    length = skb->len;
    if (length < ETH_ZLEN) {
        if (skb_padto(skb, ETH_ZLEN))
            return NETDEV_TX_OK;
        length = ETH_ZLEN;
    }

    /*
     * Map the packet data into the logical DMA address space
     */

    laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
    if (!laddr) {
        printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", dev->name);
        dev_kfree_skb(skb);
        return NETDEV_TX_BUSY;
    }

    sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
    sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1);   /* single fragment */
    sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
    sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
    sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
    sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
    sonic_tda_put(dev, entry, SONIC_TD_LINK,
        sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);

    /*
     * Must set tx_skb[entry] only after clearing status, and
     * before clearing EOL and before stopping queue
     */
    wmb();
    lp->tx_len[entry] = length;
    lp->tx_laddr[entry] = laddr;
    lp->tx_skb[entry] = skb;

    wmb();
    sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
                  sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
    lp->eol_tx = entry;

    lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
    if (lp->tx_skb[lp->next_tx] != NULL) {
        /* The ring is full, the ISR has yet to process the next TD. */
        if (sonic_debug > 3)
            printk("%s: stopping queue\n", dev->name);
        netif_stop_queue(dev);
        /* after this packet, wait for ISR to free up some TDAs */
    } else netif_start_queue(dev);

    if (sonic_debug > 2)
        printk("sonic_send_packet: issuing Tx command\n");

    SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);

    return NETDEV_TX_OK;
}

/*
 * The typical workload of the driver:
 * Handle the network interface interrupts.
 */
static irqreturn_t sonic_interrupt(int irq, void *dev_id)
{
    struct net_device *dev = dev_id;
    struct sonic_local *lp = netdev_priv(dev);
    int status;

    if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
        return IRQ_NONE;

    do {
        if (status & SONIC_INT_PKTRX) {
            if (sonic_debug > 2)
                printk("%s: packet rx\n", dev->name);
            sonic_rx(dev);  /* got packet(s) */
            SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
        }

        if (status & SONIC_INT_TXDN) {
            int entry = lp->cur_tx;
            int td_status;
            int freed_some = 0;

            /* At this point, cur_tx is the index of a TD that is one of:
             *   unallocated/freed                          (status set   & tx_skb[entry] clear)
             *   allocated and sent                         (status set   & tx_skb[entry] set  )
             *   allocated and not yet sent                 (status clear & tx_skb[entry] set  )
             *   still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
             */

            if (sonic_debug > 2)
                printk("%s: tx done\n", dev->name);

            while (lp->tx_skb[entry] != NULL) {
                if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
                    break;

                if (td_status & 0x0001) {
                    lp->stats.tx_packets++;
                    lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
                } else {
                    lp->stats.tx_errors++;
                    if (td_status & 0x0642)
                        lp->stats.tx_aborted_errors++;
                    if (td_status & 0x0180)
                        lp->stats.tx_carrier_errors++;
                    if (td_status & 0x0020)
                        lp->stats.tx_window_errors++;
                    if (td_status & 0x0004)
                        lp->stats.tx_fifo_errors++;
                }

                /* We must free the original skb */
                dev_kfree_skb_irq(lp->tx_skb[entry]);
                lp->tx_skb[entry] = NULL;
                /* and unmap DMA buffer */
                dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
                lp->tx_laddr[entry] = (dma_addr_t)0;
                freed_some = 1;

                if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
                    entry = (entry + 1) & SONIC_TDS_MASK;
                    break;
                }
                entry = (entry + 1) & SONIC_TDS_MASK;
            }

            if (freed_some || lp->tx_skb[entry] == NULL)
                netif_wake_queue(dev);  /* The ring is no longer full */
            lp->cur_tx = entry;
            SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
        }

        /*
         * check error conditions
         */
        if (status & SONIC_INT_RFO) {
            if (sonic_debug > 1)
                printk("%s: rx fifo overrun\n", dev->name);
            lp->stats.rx_fifo_errors++;
            SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
        }
        if (status & SONIC_INT_RDE) {
            if (sonic_debug > 1)
                printk("%s: rx descriptors exhausted\n", dev->name);
            lp->stats.rx_dropped++;
            SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
        }
        if (status & SONIC_INT_RBAE) {
            if (sonic_debug > 1)
                printk("%s: rx buffer area exceeded\n", dev->name);
            lp->stats.rx_dropped++;
            SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
        }

        /* counter overruns; all counters are 16bit wide */
        if (status & SONIC_INT_FAE) {
            lp->stats.rx_frame_errors += 65536;
            SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
        }
        if (status & SONIC_INT_CRC) {
            lp->stats.rx_crc_errors += 65536;
            SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
        }
        if (status & SONIC_INT_MP) {
            lp->stats.rx_missed_errors += 65536;
            SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
        }

        /* transmit error */
        if (status & SONIC_INT_TXER) {
            if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
                printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
            SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
        }

        /* bus retry */
        if (status & SONIC_INT_BR) {
            printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
                dev->name);
            /* ... to help debug DMA problems causing endless interrupts. */
            /* Bounce the eth interface to turn on the interrupt again. */
            SONIC_WRITE(SONIC_IMR, 0);
            SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
        }

        /* load CAM done */
        if (status & SONIC_INT_LCD)
            SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
    } while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
    return IRQ_HANDLED;
}

/*
 * We have a good packet(s), pass it/them up the network stack.
 */
static void sonic_rx(struct net_device *dev)
{
    struct sonic_local *lp = netdev_priv(dev);
    int status;
    int entry = lp->cur_rx;

    while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
        struct sk_buff *used_skb;
        struct sk_buff *new_skb;
        dma_addr_t new_laddr;
        u16 bufadr_l;
        u16 bufadr_h;
        int pkt_len;

        status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
        if (status & SONIC_RCR_PRX) {
            /* Malloc up new buffer. */
            new_skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
            if (new_skb == NULL) {
                printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", dev->name);
                lp->stats.rx_dropped++;
                break;
            }
            /* provide 16 byte IP header alignment unless DMA requires otherwise */
            if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
                skb_reserve(new_skb, 2);

            new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
                                       SONIC_RBSIZE, DMA_FROM_DEVICE);
            if (!new_laddr) {
                dev_kfree_skb(new_skb);
                printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
                lp->stats.rx_dropped++;
                break;
            }

            /* now we have a new skb to replace it, pass the used one up the stack */
            dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
            used_skb = lp->rx_skb[entry];
            pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
            skb_trim(used_skb, pkt_len);
            used_skb->protocol = eth_type_trans(used_skb, dev);
            netif_rx(used_skb);
            lp->stats.rx_packets++;
            lp->stats.rx_bytes += pkt_len;

            /* and insert the new skb */
            lp->rx_laddr[entry] = new_laddr;
            lp->rx_skb[entry] = new_skb;

            bufadr_l = (unsigned long)new_laddr & 0xffff;
            bufadr_h = (unsigned long)new_laddr >> 16;
            sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
            sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
        } else {
            /* This should only happen, if we enable accepting broken packets. */
            lp->stats.rx_errors++;
            if (status & SONIC_RCR_FAER)
                lp->stats.rx_frame_errors++;
            if (status & SONIC_RCR_CRCR)
                lp->stats.rx_crc_errors++;
        }
        if (status & SONIC_RCR_LPKT) {
            /*
             * this was the last packet out of the current receive buffer
             * give the buffer back to the SONIC
             */
            lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
            if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
            SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
            if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
                if (sonic_debug > 2)
                    printk("%s: rx buffer exhausted\n", dev->name);
                SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
            }
        } else
            printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
                 dev->name);
        /*
         * give back the descriptor
         */
        sonic_rda_put(dev, entry, SONIC_RD_LINK,
            sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
        sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
        sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
            sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
        lp->eol_rx = entry;
        lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
    }
    /*
     * If any worth-while packets have been received, netif_rx()
     * has done a mark_bh(NET_BH) for us and will work on them
     * when we get to the bottom-half routine.
     */
}


/*
 * Get the current statistics.
 * This may be called with the device open or closed.
 */
static struct net_device_stats *sonic_get_stats(struct net_device *dev)
{
    struct sonic_local *lp = netdev_priv(dev);

    /* read the tally counter from the SONIC and reset them */
    lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
    SONIC_WRITE(SONIC_CRCT, 0xffff);
    lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
    SONIC_WRITE(SONIC_FAET, 0xffff);
    lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
    SONIC_WRITE(SONIC_MPT, 0xffff);

    return &lp->stats;
}


/*
 * Set or clear the multicast filter for this adaptor.
 */
static void sonic_multicast_list(struct net_device *dev)
{
    struct sonic_local *lp = netdev_priv(dev);
    unsigned int rcr;
    struct netdev_hw_addr *ha;
    unsigned char *addr;
    int i;

    rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
    rcr |= SONIC_RCR_BRD;   /* accept broadcast packets */

    if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
        rcr |= SONIC_RCR_PRO;
    } else {
        if ((dev->flags & IFF_ALLMULTI) ||
            (netdev_mc_count(dev) > 15)) {
            rcr |= SONIC_RCR_AMC;
        } else {
            if (sonic_debug > 2)
                printk("sonic_multicast_list: mc_count %d\n",
                       netdev_mc_count(dev));
            sonic_set_cam_enable(dev, 1);  /* always enable our own address */
            i = 1;
            netdev_for_each_mc_addr(ha, dev) {
                addr = ha->addr;
                sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
                sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
                sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
                sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
                i++;
            }
            SONIC_WRITE(SONIC_CDC, 16);
            /* issue Load CAM command */
            SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
            SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
        }
    }

    if (sonic_debug > 2)
        printk("sonic_multicast_list: setting RCR=%x\n", rcr);

    SONIC_WRITE(SONIC_RCR, rcr);
}


/*
 * Initialize the SONIC ethernet controller.
 */
static int sonic_init(struct net_device *dev)
{
    unsigned int cmd;
    struct sonic_local *lp = netdev_priv(dev);
    int i;

    /*
     * put the Sonic into software-reset mode and
     * disable all interrupts
     */
    SONIC_WRITE(SONIC_IMR, 0);
    SONIC_WRITE(SONIC_ISR, 0x7fff);
    SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);

    /*
     * clear software reset flag, disable receiver, clear and
     * enable interrupts, then completely initialize the SONIC
     */
    SONIC_WRITE(SONIC_CMD, 0);
    SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);

    /*
     * initialize the receive resource area
     */
    if (sonic_debug > 2)
        printk("sonic_init: initialize receive resource area\n");

    for (i = 0; i < SONIC_NUM_RRS; i++) {
        u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
        u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
        sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
        sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
        sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
        sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
    }

    /* initialize all RRA registers */
    lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
                    SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
    lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
                    SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;

    SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
    SONIC_WRITE(SONIC_REA, lp->rra_end);
    SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
    SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
    SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
    SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));

    /* load the resource pointers */
    if (sonic_debug > 3)
        printk("sonic_init: issuing RRRA command\n");

    SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
    i = 0;
    while (i++ < 100) {
        if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
            break;
    }

    if (sonic_debug > 2)
        printk("sonic_init: status=%x i=%d\n", SONIC_READ(SONIC_CMD), i);

    /*
     * Initialize the receive descriptors so that they
     * become a circular linked list, ie. let the last
     * descriptor point to the first again.
     */
    if (sonic_debug > 2)
        printk("sonic_init: initialize receive descriptors\n");
    for (i=0; i<SONIC_NUM_RDS; i++) {
        sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
        sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
        sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
        sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
        sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
        sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
        sonic_rda_put(dev, i, SONIC_RD_LINK,
            lp->rda_laddr +
            ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
    }
    /* fix last descriptor */
    sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
        (lp->rda_laddr & 0xffff) | SONIC_EOL);
    lp->eol_rx = SONIC_NUM_RDS - 1;
    lp->cur_rx = 0;
    SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
    SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);

    /*
     * initialize transmit descriptors
     */
    if (sonic_debug > 2)
        printk("sonic_init: initialize transmit descriptors\n");
    for (i = 0; i < SONIC_NUM_TDS; i++) {
        sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
        sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
        sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
        sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
        sonic_tda_put(dev, i, SONIC_TD_LINK,
            (lp->tda_laddr & 0xffff) +
            (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
        lp->tx_skb[i] = NULL;
    }
    /* fix last descriptor */
    sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
        (lp->tda_laddr & 0xffff));

    SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
    SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
    lp->cur_tx = lp->next_tx = 0;
    lp->eol_tx = SONIC_NUM_TDS - 1;

    /*
     * put our own address to CAM desc[0]
     */
    sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
    sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
    sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
    sonic_set_cam_enable(dev, 1);

    for (i = 0; i < 16; i++)
        sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);

    /*
     * initialize CAM registers
     */
    SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
    SONIC_WRITE(SONIC_CDC, 16);

    /*
     * load the CAM
     */
    SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);

    i = 0;
    while (i++ < 100) {
        if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
            break;
    }
    if (sonic_debug > 2) {
        printk("sonic_init: CMD=%x, ISR=%x\n, i=%d",
               SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
    }

    /*
     * enable receiver, disable loopback
     * and enable all interrupts
     */
    SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
    SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
    SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
    SONIC_WRITE(SONIC_ISR, 0x7fff);
    SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);

    cmd = SONIC_READ(SONIC_CMD);
    if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
        printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);

    if (sonic_debug > 2)
        printk("sonic_init: new status=%x\n",
               SONIC_READ(SONIC_CMD));

    return 0;
}

MODULE_LICENSE("GPL");