text: /*
   * 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 (tsbogend@alpha.franken.de)
   *
   * This driver is based on work from Andreas Busse, but most of
   * the code is rewritten.
   *
   * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
   *
   *    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 <dhd@debian.org>
   *
   */
  
  /*
   * 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++;
  	netif_trans_update(dev); /* 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) {
  				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");
  