OSCL-LXR linux-6.0.1/​drivers/​net/​ethernet/​toshiba/​spider_net.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Network device driver for Cell Processor-Based Blade and Celleb platform
  *
  * (C) Copyright IBM Corp. 2005
  * (C) Copyright 2006 TOSHIBA CORPORATION
  *
  * Authors : Utz Bacher <utz.bacher@de.ibm.com>
  *           Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
  */
 
 #include <linux/compiler.h>
 #include <linux/crc32.h>
 #include <linux/delay.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/firmware.h>
 #include <linux/if_vlan.h>
 #include <linux/in.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/gfp.h>
 #include <linux/ioport.h>
 #include <linux/ip.h>
 #include <linux/kernel.h>
 #include <linux/mii.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/device.h>
 #include <linux/pci.h>
 #include <linux/skbuff.h>
 #include <linux/tcp.h>
 #include <linux/types.h>
 #include <linux/vmalloc.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
 #include <linux/bitops.h>
 #include <linux/of.h>
 #include <net/checksum.h>
 
 #include "spider_net.h"
 
 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
           "<Jens.Osterkamp@de.ibm.com>");
 MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(VERSION);
 MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME);
 
 static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
 static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
 
 module_param(rx_descriptors, int, 0444);
 module_param(tx_descriptors, int, 0444);
 
 MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
          "in rx chains");
 MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
          "in tx chain");
 
 char spider_net_driver_name[] = "spidernet";
 
 static const struct pci_device_id spider_net_pci_tbl[] = {
     { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
       PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
     { 0, }
 };
 
 MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
 
 /**
  * spider_net_read_reg - reads an SMMIO register of a card
  * @card: device structure
  * @reg: register to read from
  *
  * returns the content of the specified SMMIO register.
  */
 static inline u32
 spider_net_read_reg(struct spider_net_card *card, u32 reg)
 {
     /* We use the powerpc specific variants instead of readl_be() because
      * we know spidernet is not a real PCI device and we can thus avoid the
      * performance hit caused by the PCI workarounds.
      */
     return in_be32(card->regs + reg);
 }
 
 /**
  * spider_net_write_reg - writes to an SMMIO register of a card
  * @card: device structure
  * @reg: register to write to
  * @value: value to write into the specified SMMIO register
  */
 static inline void
 spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
 {
     /* We use the powerpc specific variants instead of writel_be() because
      * we know spidernet is not a real PCI device and we can thus avoid the
      * performance hit caused by the PCI workarounds.
      */
     out_be32(card->regs + reg, value);
 }
 
 /**
  * spider_net_write_phy - write to phy register
  * @netdev: adapter to be written to
  * @mii_id: id of MII
  * @reg: PHY register
  * @val: value to be written to phy register
  *
  * spider_net_write_phy_register writes to an arbitrary PHY
  * register via the spider GPCWOPCMD register. We assume the queue does
  * not run full (not more than 15 commands outstanding).
  **/
 static void
 spider_net_write_phy(struct net_device *netdev, int mii_id,
              int reg, int val)
 {
     struct spider_net_card *card = netdev_priv(netdev);
     u32 writevalue;
 
     writevalue = ((u32)mii_id << 21) |
         ((u32)reg << 16) | ((u32)val);
 
     spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
 }
 
 /**
  * spider_net_read_phy - read from phy register
  * @netdev: network device to be read from
  * @mii_id: id of MII
  * @reg: PHY register
  *
  * Returns value read from PHY register
  *
  * spider_net_write_phy reads from an arbitrary PHY
  * register via the spider GPCROPCMD register
  **/
 static int
 spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
 {
     struct spider_net_card *card = netdev_priv(netdev);
     u32 readvalue;
 
     readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
     spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
 
     /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
      * interrupt, as we poll for the completion of the read operation
      * in spider_net_read_phy. Should take about 50 us
      */
     do {
         readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
     } while (readvalue & SPIDER_NET_GPREXEC);
 
     readvalue &= SPIDER_NET_GPRDAT_MASK;
 
     return readvalue;
 }
 
 /**
  * spider_net_setup_aneg - initial auto-negotiation setup
  * @card: device structure
  **/
 static void
 spider_net_setup_aneg(struct spider_net_card *card)
 {
     struct mii_phy *phy = &card->phy;
     u32 advertise = 0;
     u16 bmsr, estat;
 
     bmsr  = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
     estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);
 
     if (bmsr & BMSR_10HALF)
         advertise |= ADVERTISED_10baseT_Half;
     if (bmsr & BMSR_10FULL)
         advertise |= ADVERTISED_10baseT_Full;
     if (bmsr & BMSR_100HALF)
         advertise |= ADVERTISED_100baseT_Half;
     if (bmsr & BMSR_100FULL)
         advertise |= ADVERTISED_100baseT_Full;
 
     if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
         advertise |= SUPPORTED_1000baseT_Full;
     if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
         advertise |= SUPPORTED_1000baseT_Half;
 
     sungem_phy_probe(phy, phy->mii_id);
     phy->def->ops->setup_aneg(phy, advertise);
 
 }
 
 /**
  * spider_net_rx_irq_off - switch off rx irq on this spider card
  * @card: device structure
  *
  * switches off rx irq by masking them out in the GHIINTnMSK register
  */
 static void
 spider_net_rx_irq_off(struct spider_net_card *card)
 {
     u32 regvalue;
 
     regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
     spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
 }
 
 /**
  * spider_net_rx_irq_on - switch on rx irq on this spider card
  * @card: device structure
  *
  * switches on rx irq by enabling them in the GHIINTnMSK register
  */
 static void
 spider_net_rx_irq_on(struct spider_net_card *card)
 {
     u32 regvalue;
 
     regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
     spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
 }
 
 /**
  * spider_net_set_promisc - sets the unicast address or the promiscuous mode
  * @card: card structure
  *
  * spider_net_set_promisc sets the unicast destination address filter and
  * thus either allows for non-promisc mode or promisc mode
  */
 static void
 spider_net_set_promisc(struct spider_net_card *card)
 {
     u32 macu, macl;
     struct net_device *netdev = card->netdev;
 
     if (netdev->flags & IFF_PROMISC) {
         /* clear destination entry 0 */
         spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
         spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
         spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
                      SPIDER_NET_PROMISC_VALUE);
     } else {
         macu = netdev->dev_addr[0];
         macu <<= 8;
         macu |= netdev->dev_addr[1];
         memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
 
         macu |= SPIDER_NET_UA_DESCR_VALUE;
         spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
         spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
         spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
                      SPIDER_NET_NONPROMISC_VALUE);
     }
 }
 
 /**
  * spider_net_get_descr_status -- returns the status of a descriptor
  * @hwdescr: descriptor to look at
  *
  * returns the status as in the dmac_cmd_status field of the descriptor
  */
 static inline int
 spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
 {
     return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
 }
 
 /**
  * spider_net_free_chain - free descriptor chain
  * @card: card structure
  * @chain: address of chain
  *
  */
 static void
 spider_net_free_chain(struct spider_net_card *card,
               struct spider_net_descr_chain *chain)
 {
     struct spider_net_descr *descr;
 
     descr = chain->ring;
     do {
         descr->bus_addr = 0;
         descr->hwdescr->next_descr_addr = 0;
         descr = descr->next;
     } while (descr != chain->ring);
 
     dma_free_coherent(&card->pdev->dev, chain->num_desc * sizeof(struct spider_net_hw_descr),
               chain->hwring, chain->dma_addr);
 }
 
 /**
  * spider_net_init_chain - alloc and link descriptor chain
  * @card: card structure
  * @chain: address of chain
  *
  * We manage a circular list that mirrors the hardware structure,
  * except that the hardware uses bus addresses.
  *
  * Returns 0 on success, <0 on failure
  */
 static int
 spider_net_init_chain(struct spider_net_card *card,
                struct spider_net_descr_chain *chain)
 {
     int i;
     struct spider_net_descr *descr;
     struct spider_net_hw_descr *hwdescr;
     dma_addr_t buf;
     size_t alloc_size;
 
     alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
 
     chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
                        &chain->dma_addr, GFP_KERNEL);
     if (!chain->hwring)
         return -ENOMEM;
 
     /* Set up the hardware pointers in each descriptor */
     descr = chain->ring;
     hwdescr = chain->hwring;
     buf = chain->dma_addr;
     for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {
         hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
         hwdescr->next_descr_addr = 0;
 
         descr->hwdescr = hwdescr;
         descr->bus_addr = buf;
         descr->next = descr + 1;
         descr->prev = descr - 1;
 
         buf += sizeof(struct spider_net_hw_descr);
     }
     /* do actual circular list */
     (descr-1)->next = chain->ring;
     chain->ring->prev = descr-1;
 
     spin_lock_init(&chain->lock);
     chain->head = chain->ring;
     chain->tail = chain->ring;
     return 0;
 }
 
 /**
  * spider_net_free_rx_chain_contents - frees descr contents in rx chain
  * @card: card structure
  *
  * returns 0 on success, <0 on failure
  */
 static void
 spider_net_free_rx_chain_contents(struct spider_net_card *card)
 {
     struct spider_net_descr *descr;
 
     descr = card->rx_chain.head;
     do {
         if (descr->skb) {
             dma_unmap_single(&card->pdev->dev,
                      descr->hwdescr->buf_addr,
                      SPIDER_NET_MAX_FRAME,
                      DMA_BIDIRECTIONAL);
             dev_kfree_skb(descr->skb);
             descr->skb = NULL;
         }
         descr = descr->next;
     } while (descr != card->rx_chain.head);
 }
 
 /**
  * spider_net_prepare_rx_descr - Reinitialize RX descriptor
  * @card: card structure
  * @descr: descriptor to re-init
  *
  * Return 0 on success, <0 on failure.
  *
  * Allocates a new rx skb, iommu-maps it and attaches it to the
  * descriptor. Mark the descriptor as activated, ready-to-use.
  */
 static int
 spider_net_prepare_rx_descr(struct spider_net_card *card,
                 struct spider_net_descr *descr)
 {
     struct spider_net_hw_descr *hwdescr = descr->hwdescr;
     dma_addr_t buf;
     int offset;
     int bufsize;
 
     /* we need to round up the buffer size to a multiple of 128 */
     bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
         (~(SPIDER_NET_RXBUF_ALIGN - 1));
 
     /* and we need to have it 128 byte aligned, therefore we allocate a
      * bit more
      */
     /* allocate an skb */
     descr->skb = netdev_alloc_skb(card->netdev,
                       bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
     if (!descr->skb) {
         if (netif_msg_rx_err(card) && net_ratelimit())
             dev_err(&card->netdev->dev,
                     "Not enough memory to allocate rx buffer\n");
         card->spider_stats.alloc_rx_skb_error++;
         return -ENOMEM;
     }
     hwdescr->buf_size = bufsize;
     hwdescr->result_size = 0;
     hwdescr->valid_size = 0;
     hwdescr->data_status = 0;
     hwdescr->data_error = 0;
 
     offset = ((unsigned long)descr->skb->data) &
         (SPIDER_NET_RXBUF_ALIGN - 1);
     if (offset)
         skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
     /* iommu-map the skb */
     buf = dma_map_single(&card->pdev->dev, descr->skb->data,
                  SPIDER_NET_MAX_FRAME, DMA_FROM_DEVICE);
     if (dma_mapping_error(&card->pdev->dev, buf)) {
         dev_kfree_skb_any(descr->skb);
         descr->skb = NULL;
         if (netif_msg_rx_err(card) && net_ratelimit())
             dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n");
         card->spider_stats.rx_iommu_map_error++;
         hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
     } else {
         hwdescr->buf_addr = buf;
         wmb();
         hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
                      SPIDER_NET_DMAC_NOINTR_COMPLETE;
     }
 
     return 0;
 }
 
 /**
  * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
  * @card: card structure
  *
  * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
  * chip by writing to the appropriate register. DMA is enabled in
  * spider_net_enable_rxdmac.
  */
 static inline void
 spider_net_enable_rxchtails(struct spider_net_card *card)
 {
     /* assume chain is aligned correctly */
     spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
                  card->rx_chain.tail->bus_addr);
 }
 
 /**
  * spider_net_enable_rxdmac - enables a receive DMA controller
  * @card: card structure
  *
  * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
  * in the GDADMACCNTR register
  */
 static inline void
 spider_net_enable_rxdmac(struct spider_net_card *card)
 {
     wmb();
     spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
                  SPIDER_NET_DMA_RX_VALUE);
 }
 
 /**
  * spider_net_disable_rxdmac - disables the receive DMA controller
  * @card: card structure
  *
  * spider_net_disable_rxdmac terminates processing on the DMA controller
  * by turing off the DMA controller, with the force-end flag set.
  */
 static inline void
 spider_net_disable_rxdmac(struct spider_net_card *card)
 {
     spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
                  SPIDER_NET_DMA_RX_FEND_VALUE);
 }
 
 /**
  * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
  * @card: card structure
  *
  * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
  */
 static void
 spider_net_refill_rx_chain(struct spider_net_card *card)
 {
     struct spider_net_descr_chain *chain = &card->rx_chain;
     unsigned long flags;
 
     /* one context doing the refill (and a second context seeing that
      * and omitting it) is ok. If called by NAPI, we'll be called again
      * as spider_net_decode_one_descr is called several times. If some
      * interrupt calls us, the NAPI is about to clean up anyway.
      */
     if (!spin_trylock_irqsave(&chain->lock, flags))
         return;
 
     while (spider_net_get_descr_status(chain->head->hwdescr) ==
             SPIDER_NET_DESCR_NOT_IN_USE) {
         if (spider_net_prepare_rx_descr(card, chain->head))
             break;
         chain->head = chain->head->next;
     }
 
     spin_unlock_irqrestore(&chain->lock, flags);
 }
 
 /**
  * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
  * @card: card structure
  *
  * Returns 0 on success, <0 on failure.
  */
 static int
 spider_net_alloc_rx_skbs(struct spider_net_card *card)
 {
     struct spider_net_descr_chain *chain = &card->rx_chain;
     struct spider_net_descr *start = chain->tail;
     struct spider_net_descr *descr = start;
 
     /* Link up the hardware chain pointers */
     do {
         descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
         descr = descr->next;
     } while (descr != start);
 
     /* Put at least one buffer into the chain. if this fails,
      * we've got a problem. If not, spider_net_refill_rx_chain
      * will do the rest at the end of this function.
      */
     if (spider_net_prepare_rx_descr(card, chain->head))
         goto error;
     else
         chain->head = chain->head->next;
 
     /* This will allocate the rest of the rx buffers;
      * if not, it's business as usual later on.
      */
     spider_net_refill_rx_chain(card);
     spider_net_enable_rxdmac(card);
     return 0;
 
 error:
     spider_net_free_rx_chain_contents(card);
     return -ENOMEM;
 }
 
 /**
  * spider_net_get_multicast_hash - generates hash for multicast filter table
  * @netdev: interface device structure
  * @addr: multicast address
  *
  * returns the hash value.
  *
  * spider_net_get_multicast_hash calculates a hash value for a given multicast
  * address, that is used to set the multicast filter tables
  */
 static u8
 spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
 {
     u32 crc;
     u8 hash;
     char addr_for_crc[ETH_ALEN] = { 0, };
     int i, bit;
 
     for (i = 0; i < ETH_ALEN * 8; i++) {
         bit = (addr[i / 8] >> (i % 8)) & 1;
         addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
     }
 
     crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
 
     hash = (crc >> 27);
     hash <<= 3;
     hash |= crc & 7;
     hash &= 0xff;
 
     return hash;
 }
 
 /**
  * spider_net_set_multi - sets multicast addresses and promisc flags
  * @netdev: interface device structure
  *
  * spider_net_set_multi configures multicast addresses as needed for the
  * netdev interface. It also sets up multicast, allmulti and promisc
  * flags appropriately
  */
 static void
 spider_net_set_multi(struct net_device *netdev)
 {
     struct netdev_hw_addr *ha;
     u8 hash;
     int i;
     u32 reg;
     struct spider_net_card *card = netdev_priv(netdev);
     DECLARE_BITMAP(bitmask, SPIDER_NET_MULTICAST_HASHES);
 
     spider_net_set_promisc(card);
 
     if (netdev->flags & IFF_ALLMULTI) {
         bitmap_fill(bitmask, SPIDER_NET_MULTICAST_HASHES);
         goto write_hash;
     }
 
     bitmap_zero(bitmask, SPIDER_NET_MULTICAST_HASHES);
 
     /* well, we know, what the broadcast hash value is: it's xfd
     hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
     __set_bit(0xfd, bitmask);
 
     netdev_for_each_mc_addr(ha, netdev) {
         hash = spider_net_get_multicast_hash(netdev, ha->addr);
         __set_bit(hash, bitmask);
     }
 
 write_hash:
     for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
         reg = 0;
         if (test_bit(i * 4, bitmask))
             reg += 0x08;
         reg <<= 8;
         if (test_bit(i * 4 + 1, bitmask))
             reg += 0x08;
         reg <<= 8;
         if (test_bit(i * 4 + 2, bitmask))
             reg += 0x08;
         reg <<= 8;
         if (test_bit(i * 4 + 3, bitmask))
             reg += 0x08;
 
         spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
     }
 }
 
 /**
  * spider_net_prepare_tx_descr - fill tx descriptor with skb data
  * @card: card structure
  * @skb: packet to use
  *
  * returns 0 on success, <0 on failure.
  *
  * fills out the descriptor structure with skb data and len. Copies data,
  * if needed (32bit DMA!)
  */
 static int
 spider_net_prepare_tx_descr(struct spider_net_card *card,
                 struct sk_buff *skb)
 {
     struct spider_net_descr_chain *chain = &card->tx_chain;
     struct spider_net_descr *descr;
     struct spider_net_hw_descr *hwdescr;
     dma_addr_t buf;
     unsigned long flags;
 
     buf = dma_map_single(&card->pdev->dev, skb->data, skb->len,
                  DMA_TO_DEVICE);
     if (dma_mapping_error(&card->pdev->dev, buf)) {
         if (netif_msg_tx_err(card) && net_ratelimit())
             dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). "
                   "Dropping packet\n", skb->data, skb->len);
         card->spider_stats.tx_iommu_map_error++;
         return -ENOMEM;
     }
 
     spin_lock_irqsave(&chain->lock, flags);
     descr = card->tx_chain.head;
     if (descr->next == chain->tail->prev) {
         spin_unlock_irqrestore(&chain->lock, flags);
         dma_unmap_single(&card->pdev->dev, buf, skb->len,
                  DMA_TO_DEVICE);
         return -ENOMEM;
     }
     hwdescr = descr->hwdescr;
     chain->head = descr->next;
 
     descr->skb = skb;
     hwdescr->buf_addr = buf;
     hwdescr->buf_size = skb->len;
     hwdescr->next_descr_addr = 0;
     hwdescr->data_status = 0;
 
     hwdescr->dmac_cmd_status =
             SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL;
     spin_unlock_irqrestore(&chain->lock, flags);
 
     if (skb->ip_summed == CHECKSUM_PARTIAL)
         switch (ip_hdr(skb)->protocol) {
         case IPPROTO_TCP:
             hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
             break;
         case IPPROTO_UDP:
             hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
             break;
         }
 
     /* Chain the bus address, so that the DMA engine finds this descr. */
     wmb();
     descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
 
     netif_trans_update(card->netdev); /* set netdev watchdog timer */
     return 0;
 }
 
 static int
 spider_net_set_low_watermark(struct spider_net_card *card)
 {
     struct spider_net_descr *descr = card->tx_chain.tail;
     struct spider_net_hw_descr *hwdescr;
     unsigned long flags;
     int status;
     int cnt=0;
     int i;
 
     /* Measure the length of the queue. Measurement does not
      * need to be precise -- does not need a lock.
      */
     while (descr != card->tx_chain.head) {
         status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
         if (status == SPIDER_NET_DESCR_NOT_IN_USE)
             break;
         descr = descr->next;
         cnt++;
     }
 
     /* If TX queue is short, don't even bother with interrupts */
     if (cnt < card->tx_chain.num_desc/4)
         return cnt;
 
     /* Set low-watermark 3/4th's of the way into the queue. */
     descr = card->tx_chain.tail;
     cnt = (cnt*3)/4;
     for (i=0;i<cnt; i++)
         descr = descr->next;
 
     /* Set the new watermark, clear the old watermark */
     spin_lock_irqsave(&card->tx_chain.lock, flags);
     descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
     if (card->low_watermark && card->low_watermark != descr) {
         hwdescr = card->low_watermark->hwdescr;
         hwdescr->dmac_cmd_status =
              hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
     }
     card->low_watermark = descr;
     spin_unlock_irqrestore(&card->tx_chain.lock, flags);
     return cnt;
 }
 
 /**
  * spider_net_release_tx_chain - processes sent tx descriptors
  * @card: adapter structure
  * @brutal: if set, don't care about whether descriptor seems to be in use
  *
  * returns 0 if the tx ring is empty, otherwise 1.
  *
  * spider_net_release_tx_chain releases the tx descriptors that spider has
  * finished with (if non-brutal) or simply release tx descriptors (if brutal).
  * If some other context is calling this function, we return 1 so that we're
  * scheduled again (if we were scheduled) and will not lose initiative.
  */
 static int
 spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
 {
     struct net_device *dev = card->netdev;
     struct spider_net_descr_chain *chain = &card->tx_chain;
     struct spider_net_descr *descr;
     struct spider_net_hw_descr *hwdescr;
     struct sk_buff *skb;
     u32 buf_addr;
     unsigned long flags;
     int status;
 
     while (1) {
         spin_lock_irqsave(&chain->lock, flags);
         if (chain->tail == chain->head) {
             spin_unlock_irqrestore(&chain->lock, flags);
             return 0;
         }
         descr = chain->tail;
         hwdescr = descr->hwdescr;
 
         status = spider_net_get_descr_status(hwdescr);
         switch (status) {
         case SPIDER_NET_DESCR_COMPLETE:
             dev->stats.tx_packets++;
             dev->stats.tx_bytes += descr->skb->len;
             break;
 
         case SPIDER_NET_DESCR_CARDOWNED:
             if (!brutal) {
                 spin_unlock_irqrestore(&chain->lock, flags);
                 return 1;
             }
 
             /* fallthrough, if we release the descriptors
              * brutally (then we don't care about
              * SPIDER_NET_DESCR_CARDOWNED)
              */
             fallthrough;
 
         case SPIDER_NET_DESCR_RESPONSE_ERROR:
         case SPIDER_NET_DESCR_PROTECTION_ERROR:
         case SPIDER_NET_DESCR_FORCE_END:
             if (netif_msg_tx_err(card))
                 dev_err(&card->netdev->dev, "forcing end of tx descriptor "
                        "with status x%02x\n", status);
             dev->stats.tx_errors++;
             break;
 
         default:
             dev->stats.tx_dropped++;
             if (!brutal) {
                 spin_unlock_irqrestore(&chain->lock, flags);
                 return 1;
             }
         }
 
         chain->tail = descr->next;
         hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
         skb = descr->skb;
         descr->skb = NULL;
         buf_addr = hwdescr->buf_addr;
         spin_unlock_irqrestore(&chain->lock, flags);
 
         /* unmap the skb */
         if (skb) {
             dma_unmap_single(&card->pdev->dev, buf_addr, skb->len,
                      DMA_TO_DEVICE);
             dev_consume_skb_any(skb);
         }
     }
     return 0;
 }
 
 /**
  * spider_net_kick_tx_dma - enables TX DMA processing
  * @card: card structure
  *
  * This routine will start the transmit DMA running if
  * it is not already running. This routine ned only be
  * called when queueing a new packet to an empty tx queue.
  * Writes the current tx chain head as start address
  * of the tx descriptor chain and enables the transmission
  * DMA engine.
  */
 static inline void
 spider_net_kick_tx_dma(struct spider_net_card *card)
 {
     struct spider_net_descr *descr;
 
     if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
             SPIDER_NET_TX_DMA_EN)
         goto out;
 
     descr = card->tx_chain.tail;
     for (;;) {
         if (spider_net_get_descr_status(descr->hwdescr) ==
                 SPIDER_NET_DESCR_CARDOWNED) {
             spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
                     descr->bus_addr);
             spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
                     SPIDER_NET_DMA_TX_VALUE);
             break;
         }
         if (descr == card->tx_chain.head)
             break;
         descr = descr->next;
     }
 
 out:
     mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
 }
 
 /**
  * spider_net_xmit - transmits a frame over the device
  * @skb: packet to send out
  * @netdev: interface device structure
  *
  * returns NETDEV_TX_OK on success, NETDEV_TX_BUSY on failure
  */
 static netdev_tx_t
 spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
     int cnt;
     struct spider_net_card *card = netdev_priv(netdev);
 
     spider_net_release_tx_chain(card, 0);
 
     if (spider_net_prepare_tx_descr(card, skb) != 0) {
         netdev->stats.tx_dropped++;
         netif_stop_queue(netdev);
         return NETDEV_TX_BUSY;
     }
 
     cnt = spider_net_set_low_watermark(card);
     if (cnt < 5)
         spider_net_kick_tx_dma(card);
     return NETDEV_TX_OK;
 }
 
 /**
  * spider_net_cleanup_tx_ring - cleans up the TX ring
  * @t: timer context used to obtain the pointer to net card data structure
  *
  * spider_net_cleanup_tx_ring is called by either the tx_timer
  * or from the NAPI polling routine.
  * This routine releases resources associted with transmitted
  * packets, including updating the queue tail pointer.
  */
 static void
 spider_net_cleanup_tx_ring(struct timer_list *t)
 {
     struct spider_net_card *card = from_timer(card, t, tx_timer);
     if ((spider_net_release_tx_chain(card, 0) != 0) &&
         (card->netdev->flags & IFF_UP)) {
         spider_net_kick_tx_dma(card);
         netif_wake_queue(card->netdev);
     }
 }
 
 /**
  * spider_net_do_ioctl - called for device ioctls
  * @netdev: interface device structure
  * @ifr: request parameter structure for ioctl
  * @cmd: command code for ioctl
  *
  * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
  * -EOPNOTSUPP is returned, if an unknown ioctl was requested
  */
 static int
 spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 {
     switch (cmd) {
     default:
         return -EOPNOTSUPP;
     }
 }
 
 /**
  * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
  * @descr: descriptor to process
  * @card: card structure
  *
  * Fills out skb structure and passes the data to the stack.
  * The descriptor state is not changed.
  */
 static void
 spider_net_pass_skb_up(struct spider_net_descr *descr,
                struct spider_net_card *card)
 {
     struct spider_net_hw_descr *hwdescr = descr->hwdescr;
     struct sk_buff *skb = descr->skb;
     struct net_device *netdev = card->netdev;
     u32 data_status = hwdescr->data_status;
     u32 data_error = hwdescr->data_error;
 
     skb_put(skb, hwdescr->valid_size);
 
     /* the card seems to add 2 bytes of junk in front
      * of the ethernet frame
      */
 #define SPIDER_MISALIGN     2
     skb_pull(skb, SPIDER_MISALIGN);
     skb->protocol = eth_type_trans(skb, netdev);
 
     /* checksum offload */
     skb_checksum_none_assert(skb);
     if (netdev->features & NETIF_F_RXCSUM) {
         if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
                SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
              !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
             skb->ip_summed = CHECKSUM_UNNECESSARY;
     }
 
     if (data_status & SPIDER_NET_VLAN_PACKET) {
         /* further enhancements: HW-accel VLAN */
     }
 
     /* update netdevice statistics */
     netdev->stats.rx_packets++;
     netdev->stats.rx_bytes += skb->len;
 
     /* pass skb up to stack */
     netif_receive_skb(skb);
 }
 
 static void show_rx_chain(struct spider_net_card *card)
 {
     struct spider_net_descr_chain *chain = &card->rx_chain;
     struct spider_net_descr *start= chain->tail;
     struct spider_net_descr *descr= start;
     struct spider_net_hw_descr *hwd = start->hwdescr;
     struct device *dev = &card->netdev->dev;
     u32 curr_desc, next_desc;
     int status;
 
     int tot = 0;
     int cnt = 0;
     int off = start - chain->ring;
     int cstat = hwd->dmac_cmd_status;
 
     dev_info(dev, "Total number of descrs=%d\n",
         chain->num_desc);
     dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
         off, cstat);
 
     curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
     next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
 
     status = cstat;
     do
     {
         hwd = descr->hwdescr;
         off = descr - chain->ring;
         status = hwd->dmac_cmd_status;
 
         if (descr == chain->head)
             dev_info(dev, "Chain head is at %d, head status=0x%x\n",
                      off, status);
 
         if (curr_desc == descr->bus_addr)
             dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
                      off, status);
 
         if (next_desc == descr->bus_addr)
             dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
                      off, status);
 
         if (hwd->next_descr_addr == 0)
             dev_info(dev, "chain is cut at %d\n", off);
 
         if (cstat != status) {
             int from = (chain->num_desc + off - cnt) % chain->num_desc;
             int to = (chain->num_desc + off - 1) % chain->num_desc;
             dev_info(dev, "Have %d (from %d to %d) descrs "
                      "with stat=0x%08x\n", cnt, from, to, cstat);
             cstat = status;
             cnt = 0;
         }
 
         cnt ++;
         tot ++;
         descr = descr->next;
     } while (descr != start);
 
     dev_info(dev, "Last %d descrs with stat=0x%08x "
              "for a total of %d descrs\n", cnt, cstat, tot);
 
 #ifdef DEBUG
     /* Now dump the whole ring */
     descr = start;
     do
     {
         struct spider_net_hw_descr *hwd = descr->hwdescr;
         status = spider_net_get_descr_status(hwd);
         cnt = descr - chain->ring;
         dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
                  cnt, status, descr->skb);
         dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
                  descr->bus_addr, hwd->buf_addr, hwd->buf_size);
         dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
                  hwd->next_descr_addr, hwd->result_size,
                  hwd->valid_size);
         dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
                  hwd->dmac_cmd_status, hwd->data_status,
                  hwd->data_error);
         dev_info(dev, "\n");
 
         descr = descr->next;
     } while (descr != start);
 #endif
 
 }
 
 /**
  * spider_net_resync_head_ptr - Advance head ptr past empty descrs
  * @card: card structure
  *
  * If the driver fails to keep up and empty the queue, then the
  * hardware wil run out of room to put incoming packets. This
  * will cause the hardware to skip descrs that are full (instead
  * of halting/retrying). Thus, once the driver runs, it wil need
  * to "catch up" to where the hardware chain pointer is at.
  */
 static void spider_net_resync_head_ptr(struct spider_net_card *card)
 {
     unsigned long flags;
     struct spider_net_descr_chain *chain = &card->rx_chain;
     struct spider_net_descr *descr;
     int i, status;
 
     /* Advance head pointer past any empty descrs */
     descr = chain->head;
     status = spider_net_get_descr_status(descr->hwdescr);
 
     if (status == SPIDER_NET_DESCR_NOT_IN_USE)
         return;
 
     spin_lock_irqsave(&chain->lock, flags);
 
     descr = chain->head;
     status = spider_net_get_descr_status(descr->hwdescr);
     for (i=0; i<chain->num_desc; i++) {
         if (status != SPIDER_NET_DESCR_CARDOWNED) break;
         descr = descr->next;
         status = spider_net_get_descr_status(descr->hwdescr);
     }
     chain->head = descr;
 
     spin_unlock_irqrestore(&chain->lock, flags);
 }
 
 static int spider_net_resync_tail_ptr(struct spider_net_card *card)
 {
     struct spider_net_descr_chain *chain = &card->rx_chain;
     struct spider_net_descr *descr;
     int i, status;
 
     /* Advance tail pointer past any empty and reaped descrs */
     descr = chain->tail;
     status = spider_net_get_descr_status(descr->hwdescr);
 
     for (i=0; i<chain->num_desc; i++) {
         if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
             (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
         descr = descr->next;
         status = spider_net_get_descr_status(descr->hwdescr);
     }
     chain->tail = descr;
 
     if ((i == chain->num_desc) || (i == 0))
         return 1;
     return 0;
 }
 
 /**
  * spider_net_decode_one_descr - processes an RX descriptor
  * @card: card structure
  *
  * Returns 1 if a packet has been sent to the stack, otherwise 0.
  *
  * Processes an RX descriptor by iommu-unmapping the data buffer
  * and passing the packet up to the stack. This function is called
  * in softirq context, e.g. either bottom half from interrupt or
  * NAPI polling context.
  */
 static int
 spider_net_decode_one_descr(struct spider_net_card *card)
 {
     struct net_device *dev = card->netdev;
     struct spider_net_descr_chain *chain = &card->rx_chain;
     struct spider_net_descr *descr = chain->tail;
     struct spider_net_hw_descr *hwdescr = descr->hwdescr;
     u32 hw_buf_addr;
     int status;
 
     status = spider_net_get_descr_status(hwdescr);
 
     /* Nothing in the descriptor, or ring must be empty */
     if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
         (status == SPIDER_NET_DESCR_NOT_IN_USE))
         return 0;
 
     /* descriptor definitively used -- move on tail */
     chain->tail = descr->next;
 
     /* unmap descriptor */
     hw_buf_addr = hwdescr->buf_addr;
     hwdescr->buf_addr = 0xffffffff;
     dma_unmap_single(&card->pdev->dev, hw_buf_addr, SPIDER_NET_MAX_FRAME,
              DMA_FROM_DEVICE);
 
     if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
          (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
          (status == SPIDER_NET_DESCR_FORCE_END) ) {
         if (netif_msg_rx_err(card))
             dev_err(&dev->dev,
                    "dropping RX descriptor with state %d\n", status);
         dev->stats.rx_dropped++;
         goto bad_desc;
     }
 
     if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
          (status != SPIDER_NET_DESCR_FRAME_END) ) {
         if (netif_msg_rx_err(card))
             dev_err(&card->netdev->dev,
                    "RX descriptor with unknown state %d\n", status);
         card->spider_stats.rx_desc_unk_state++;
         goto bad_desc;
     }
 
     /* The cases we'll throw away the packet immediately */
     if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
         if (netif_msg_rx_err(card))
             dev_err(&card->netdev->dev,
                    "error in received descriptor found, "
                    "data_status=x%08x, data_error=x%08x\n",
                    hwdescr->data_status, hwdescr->data_error);
         goto bad_desc;
     }
 
     if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) {
         dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
                    hwdescr->dmac_cmd_status);
         pr_err("buf_addr=x%08x\n", hw_buf_addr);
         pr_err("buf_size=x%08x\n", hwdescr->buf_size);
         pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
         pr_err("result_size=x%08x\n", hwdescr->result_size);
         pr_err("valid_size=x%08x\n", hwdescr->valid_size);
         pr_err("data_status=x%08x\n", hwdescr->data_status);
         pr_err("data_error=x%08x\n", hwdescr->data_error);
         pr_err("which=%ld\n", descr - card->rx_chain.ring);
 
         card->spider_stats.rx_desc_error++;
         goto bad_desc;
     }
 
     /* Ok, we've got a packet in descr */
     spider_net_pass_skb_up(descr, card);
     descr->skb = NULL;
     hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
     return 1;
 
 bad_desc:
     if (netif_msg_rx_err(card))
         show_rx_chain(card);
     dev_kfree_skb_irq(descr->skb);
     descr->skb = NULL;
     hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
     return 0;
 }
 
 /**
  * spider_net_poll - NAPI poll function called by the stack to return packets
  * @napi: napi device structure
  * @budget: number of packets we can pass to the stack at most
  *
  * returns 0 if no more packets available to the driver/stack. Returns 1,
  * if the quota is exceeded, but the driver has still packets.
  *
  * spider_net_poll returns all packets from the rx descriptors to the stack
  * (using netif_receive_skb). If all/enough packets are up, the driver
  * reenables interrupts and returns 0. If not, 1 is returned.
  */
 static int spider_net_poll(struct napi_struct *napi, int budget)
 {
     struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
     int packets_done = 0;
 
     while (packets_done < budget) {
         if (!spider_net_decode_one_descr(card))
             break;
 
         packets_done++;
     }
 
     if ((packets_done == 0) && (card->num_rx_ints != 0)) {
         if (!spider_net_resync_tail_ptr(card))
             packets_done = budget;
         spider_net_resync_head_ptr(card);
     }
     card->num_rx_ints = 0;
 
     spider_net_refill_rx_chain(card);
     spider_net_enable_rxdmac(card);
 
     spider_net_cleanup_tx_ring(&card->tx_timer);
 
     /* if all packets are in the stack, enable interrupts and return 0 */
     /* if not, return 1 */
     if (packets_done < budget) {
         napi_complete_done(napi, packets_done);
         spider_net_rx_irq_on(card);
         card->ignore_rx_ramfull = 0;
     }
 
     return packets_done;
 }
 
 /**
  * spider_net_set_mac - sets the MAC of an interface
  * @netdev: interface device structure
  * @p: pointer to new MAC address
  *
  * Returns 0 on success, <0 on failure. Currently, we don't support this
  * and will always return EOPNOTSUPP.
  */
 static int
 spider_net_set_mac(struct net_device *netdev, void *p)
 {
     struct spider_net_card *card = netdev_priv(netdev);
     u32 macl, macu, regvalue;
     struct sockaddr *addr = p;
 
     if (!is_valid_ether_addr(addr->sa_data))
         return -EADDRNOTAVAIL;
 
     eth_hw_addr_set(netdev, addr->sa_data);
 
     /* switch off GMACTPE and GMACRPE */
     regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
     regvalue &= ~((1 << 5) | (1 << 6));
     spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
 
     /* write mac */
     macu = (netdev->dev_addr[0]<<24) + (netdev->dev_addr[1]<<16) +
         (netdev->dev_addr[2]<<8) + (netdev->dev_addr[3]);
     macl = (netdev->dev_addr[4]<<8) + (netdev->dev_addr[5]);
     spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
     spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
 
     /* switch GMACTPE and GMACRPE back on */
     regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
     regvalue |= ((1 << 5) | (1 << 6));
     spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
 
     spider_net_set_promisc(card);
 
     return 0;
 }
 
 /**
  * spider_net_link_reset
  * @netdev: net device structure
  *
  * This is called when the PHY_LINK signal is asserted. For the blade this is
  * not connected so we should never get here.
  *
  */
 static void
 spider_net_link_reset(struct net_device *netdev)
 {
 
     struct spider_net_card *card = netdev_priv(netdev);
 
     del_timer_sync(&card->aneg_timer);
 
     /* clear interrupt, block further interrupts */
     spider_net_write_reg(card, SPIDER_NET_GMACST,
                  spider_net_read_reg(card, SPIDER_NET_GMACST));
     spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
 
     /* reset phy and setup aneg */
     card->aneg_count = 0;
     card->medium = BCM54XX_COPPER;
     spider_net_setup_aneg(card);
     mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
 
 }
 
 /**
  * spider_net_handle_error_irq - handles errors raised by an interrupt
  * @card: card structure
  * @status_reg: interrupt status register 0 (GHIINT0STS)
  * @error_reg1: interrupt status register 1 (GHIINT1STS)
  * @error_reg2: interrupt status register 2 (GHIINT2STS)
  *
  * spider_net_handle_error_irq treats or ignores all error conditions
  * found when an interrupt is presented
  */
 static void
 spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
                 u32 error_reg1, u32 error_reg2)
 {
     u32 i;
     int show_error = 1;
 
     /* check GHIINT0STS ************************************/
     if (status_reg)
         for (i = 0; i < 32; i++)
             if (status_reg & (1<<i))
                 switch (i)
     {
     /* let error_reg1 and error_reg2 evaluation decide, what to do
     case SPIDER_NET_PHYINT:
     case SPIDER_NET_GMAC2INT:
     case SPIDER_NET_GMAC1INT:
     case SPIDER_NET_GFIFOINT:
     case SPIDER_NET_DMACINT:
     case SPIDER_NET_GSYSINT:
         break; */
 
     case SPIDER_NET_GIPSINT:
         show_error = 0;
         break;
 
     case SPIDER_NET_GPWOPCMPINT:
         /* PHY write operation completed */
         show_error = 0;
         break;
     case SPIDER_NET_GPROPCMPINT:
         /* PHY read operation completed */
         /* we don't use semaphores, as we poll for the completion
          * of the read operation in spider_net_read_phy. Should take
          * about 50 us
          */
         show_error = 0;
         break;
     case SPIDER_NET_GPWFFINT:
         /* PHY command queue full */
         if (netif_msg_intr(card))
             dev_err(&card->netdev->dev, "PHY write queue full\n");
         show_error = 0;
         break;
 
     /* case SPIDER_NET_GRMDADRINT: not used. print a message */
     /* case SPIDER_NET_GRMARPINT: not used. print a message */
     /* case SPIDER_NET_GRMMPINT: not used. print a message */
 
     case SPIDER_NET_GDTDEN0INT:
         /* someone has set TX_DMA_EN to 0 */
         show_error = 0;
         break;
 
     case SPIDER_NET_GDDDEN0INT:
     case SPIDER_NET_GDCDEN0INT:
     case SPIDER_NET_GDBDEN0INT:
     case SPIDER_NET_GDADEN0INT:
         /* someone has set RX_DMA_EN to 0 */
         show_error = 0;
         break;
 
     /* RX interrupts */
     case SPIDER_NET_GDDFDCINT:
     case SPIDER_NET_GDCFDCINT:
     case SPIDER_NET_GDBFDCINT:
     case SPIDER_NET_GDAFDCINT:
     /* case SPIDER_NET_GDNMINT: not used. print a message */
     /* case SPIDER_NET_GCNMINT: not used. print a message */
     /* case SPIDER_NET_GBNMINT: not used. print a message */
     /* case SPIDER_NET_GANMINT: not used. print a message */
     /* case SPIDER_NET_GRFNMINT: not used. print a message */
         show_error = 0;
         break;
 
     /* TX interrupts */
     case SPIDER_NET_GDTFDCINT:
         show_error = 0;
         break;
     case SPIDER_NET_GTTEDINT:
         show_error = 0;
         break;
     case SPIDER_NET_GDTDCEINT:
         /* chain end. If a descriptor should be sent, kick off
          * tx dma
         if (card->tx_chain.tail != card->tx_chain.head)
             spider_net_kick_tx_dma(card);
         */
         show_error = 0;
         break;
 
     /* case SPIDER_NET_G1TMCNTINT: not used. print a message */
     /* case SPIDER_NET_GFREECNTINT: not used. print a message */
     }
 
     /* check GHIINT1STS ************************************/
     if (error_reg1)
         for (i = 0; i < 32; i++)
             if (error_reg1 & (1<<i))
                 switch (i)
     {
     case SPIDER_NET_GTMFLLINT:
         /* TX RAM full may happen on a usual case.
          * Logging is not needed.
          */
         show_error = 0;
         break;
     case SPIDER_NET_GRFDFLLINT:
     case SPIDER_NET_GRFCFLLINT:
     case SPIDER_NET_GRFBFLLINT:
     case SPIDER_NET_GRFAFLLINT:
     case SPIDER_NET_GRMFLLINT:
         /* Could happen when rx chain is full */
         if (card->ignore_rx_ramfull == 0) {
             card->ignore_rx_ramfull = 1;
             spider_net_resync_head_ptr(card);
             spider_net_refill_rx_chain(card);
             spider_net_enable_rxdmac(card);
             card->num_rx_ints ++;
             napi_schedule(&card->napi);
         }
         show_error = 0;
         break;
 
     /* case SPIDER_NET_GTMSHTINT: problem, print a message */
     case SPIDER_NET_GDTINVDINT:
         /* allrighty. tx from previous descr ok */
         show_error = 0;
         break;
 
     /* chain end */
     case SPIDER_NET_GDDDCEINT:
     case SPIDER_NET_GDCDCEINT:
     case SPIDER_NET_GDBDCEINT:
     case SPIDER_NET_GDADCEINT:
         spider_net_resync_head_ptr(card);
         spider_net_refill_rx_chain(card);
         spider_net_enable_rxdmac(card);
         card->num_rx_ints ++;
         napi_schedule(&card->napi);
         show_error = 0;
         break;
 
     /* invalid descriptor */
     case SPIDER_NET_GDDINVDINT:
     case SPIDER_NET_GDCINVDINT:
     case SPIDER_NET_GDBINVDINT:
     case SPIDER_NET_GDAINVDINT:
         /* Could happen when rx chain is full */
         spider_net_resync_head_ptr(card);
         spider_net_refill_rx_chain(card);
         spider_net_enable_rxdmac(card);
         card->num_rx_ints ++;
         napi_schedule(&card->napi);
         show_error = 0;
         break;
 
     /* case SPIDER_NET_GDTRSERINT: problem, print a message */
     /* case SPIDER_NET_GDDRSERINT: problem, print a message */
     /* case SPIDER_NET_GDCRSERINT: problem, print a message */
     /* case SPIDER_NET_GDBRSERINT: problem, print a message */
     /* case SPIDER_NET_GDARSERINT: problem, print a message */
     /* case SPIDER_NET_GDSERINT: problem, print a message */
     /* case SPIDER_NET_GDTPTERINT: problem, print a message */
     /* case SPIDER_NET_GDDPTERINT: problem, print a message */
     /* case SPIDER_NET_GDCPTERINT: problem, print a message */
     /* case SPIDER_NET_GDBPTERINT: problem, print a message */
     /* case SPIDER_NET_GDAPTERINT: problem, print a message */
     default:
         show_error = 1;
         break;
     }
 
     /* check GHIINT2STS ************************************/
     if (error_reg2)
         for (i = 0; i < 32; i++)
             if (error_reg2 & (1<<i))
                 switch (i)
     {
     /* there is nothing we can (want  to) do at this time. Log a
      * message, we can switch on and off the specific values later on
     case SPIDER_NET_GPROPERINT:
     case SPIDER_NET_GMCTCRSNGINT:
     case SPIDER_NET_GMCTLCOLINT:
     case SPIDER_NET_GMCTTMOTINT:
     case SPIDER_NET_GMCRCAERINT:
     case SPIDER_NET_GMCRCALERINT:
     case SPIDER_NET_GMCRALNERINT:
     case SPIDER_NET_GMCROVRINT:
     case SPIDER_NET_GMCRRNTINT:
     case SPIDER_NET_GMCRRXERINT:
     case SPIDER_NET_GTITCSERINT:
     case SPIDER_NET_GTIFMTERINT:
     case SPIDER_NET_GTIPKTRVKINT:
     case SPIDER_NET_GTISPINGINT:
     case SPIDER_NET_GTISADNGINT:
     case SPIDER_NET_GTISPDNGINT:
     case SPIDER_NET_GRIFMTERINT:
     case SPIDER_NET_GRIPKTRVKINT:
     case SPIDER_NET_GRISPINGINT:
     case SPIDER_NET_GRISADNGINT:
     case SPIDER_NET_GRISPDNGINT:
         break;
     */
         default:
             break;
     }
 
     if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
         dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, "
                "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
                status_reg, error_reg1, error_reg2);
 
     /* clear interrupt sources */
     spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
     spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
 }
 
 /**
  * spider_net_interrupt - interrupt handler for spider_net
  * @irq: interrupt number
  * @ptr: pointer to net_device
  *
  * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
  * interrupt found raised by card.
  *
  * This is the interrupt handler, that turns off
  * interrupts for this device and makes the stack poll the driver
  */
 static irqreturn_t
 spider_net_interrupt(int irq, void *ptr)
 {
     struct net_device *netdev = ptr;
     struct spider_net_card *card = netdev_priv(netdev);
     u32 status_reg, error_reg1, error_reg2;
 
     status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
     error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
     error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
 
     if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
         !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
         !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
         return IRQ_NONE;
 
     if (status_reg & SPIDER_NET_RXINT ) {
         spider_net_rx_irq_off(card);
         napi_schedule(&card->napi);
         card->num_rx_ints ++;
     }
     if (status_reg & SPIDER_NET_TXINT)
         napi_schedule(&card->napi);
 
     if (status_reg & SPIDER_NET_LINKINT)
         spider_net_link_reset(netdev);
 
     if (status_reg & SPIDER_NET_ERRINT )
         spider_net_handle_error_irq(card, status_reg,
                         error_reg1, error_reg2);
 
     /* clear interrupt sources */
     spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
 
     return IRQ_HANDLED;
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
 /**
  * spider_net_poll_controller - artificial interrupt for netconsole etc.
  * @netdev: interface device structure
  *
  * see Documentation/networking/netconsole.rst
  */
 static void
 spider_net_poll_controller(struct net_device *netdev)
 {
     disable_irq(netdev->irq);
     spider_net_interrupt(netdev->irq, netdev);
     enable_irq(netdev->irq);
 }
 #endif /* CONFIG_NET_POLL_CONTROLLER */
 
 /**
  * spider_net_enable_interrupts - enable interrupts
  * @card: card structure
  *
  * spider_net_enable_interrupt enables several interrupts
  */
 static void
 spider_net_enable_interrupts(struct spider_net_card *card)
 {
     spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
                  SPIDER_NET_INT0_MASK_VALUE);
     spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
                  SPIDER_NET_INT1_MASK_VALUE);
     spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
                  SPIDER_NET_INT2_MASK_VALUE);
 }
 
 /**
  * spider_net_disable_interrupts - disable interrupts
  * @card: card structure
  *
  * spider_net_disable_interrupts disables all the interrupts
  */
 static void
 spider_net_disable_interrupts(struct spider_net_card *card)
 {
     spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
     spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
     spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
     spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
 }
 
 /**
  * spider_net_init_card - initializes the card
  * @card: card structure
  *
  * spider_net_init_card initializes the card so that other registers can
  * be used
  */
 static void
 spider_net_init_card(struct spider_net_card *card)
 {
     spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
                  SPIDER_NET_CKRCTRL_STOP_VALUE);
 
     spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
                  SPIDER_NET_CKRCTRL_RUN_VALUE);
 
     /* trigger ETOMOD signal */
     spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
         spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
 
     spider_net_disable_interrupts(card);
 }
 
 /**
  * spider_net_enable_card - enables the card by setting all kinds of regs
  * @card: card structure
  *
  * spider_net_enable_card sets a lot of SMMIO registers to enable the device
  */
 static void
 spider_net_enable_card(struct spider_net_card *card)
 {
     int i;
     /* the following array consists of (register),(value) pairs
      * that are set in this function. A register of 0 ends the list
      */
     u32 regs[][2] = {
         { SPIDER_NET_GRESUMINTNUM, 0 },
         { SPIDER_NET_GREINTNUM, 0 },
 
         /* set interrupt frame number registers */
         /* clear the single DMA engine registers first */
         { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
         { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
         { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
         { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
         /* then set, what we really need */
         { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
 
         /* timer counter registers and stuff */
         { SPIDER_NET_GFREECNNUM, 0 },
         { SPIDER_NET_GONETIMENUM, 0 },
         { SPIDER_NET_GTOUTFRMNUM, 0 },
 
         /* RX mode setting */
         { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
         /* TX mode setting */
         { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
         /* IPSEC mode setting */
         { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
 
         { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
 
         { SPIDER_NET_GMRWOLCTRL, 0 },
         { SPIDER_NET_GTESTMD, 0x10000000 },
         { SPIDER_NET_GTTQMSK, 0x00400040 },
 
         { SPIDER_NET_GMACINTEN, 0 },
 
         /* flow control stuff */
         { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
         { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
 
         { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
         { 0, 0}
     };
 
     i = 0;
     while (regs[i][0]) {
         spider_net_write_reg(card, regs[i][0], regs[i][1]);
         i++;
     }
 
     /* clear unicast filter table entries 1 to 14 */
     for (i = 1; i <= 14; i++) {
         spider_net_write_reg(card,
                      SPIDER_NET_GMRUAFILnR + i * 8,
                      0x00080000);
         spider_net_write_reg(card,
                      SPIDER_NET_GMRUAFILnR + i * 8 + 4,
                      0x00000000);
     }
 
     spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
 
     spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
 
     /* set chain tail address for RX chains and
      * enable DMA
      */
     spider_net_enable_rxchtails(card);
     spider_net_enable_rxdmac(card);
 
     spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
 
     spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
                  SPIDER_NET_LENLMT_VALUE);
     spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
                  SPIDER_NET_OPMODE_VALUE);
 
     spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
                  SPIDER_NET_GDTBSTA);
 }
 
 /**
  * spider_net_download_firmware - loads firmware into the adapter
  * @card: card structure
  * @firmware_ptr: pointer to firmware data
  *
  * spider_net_download_firmware loads the firmware data into the
  * adapter. It assumes the length etc. to be allright.
  */
 static int
 spider_net_download_firmware(struct spider_net_card *card,
                  const void *firmware_ptr)
 {
     int sequencer, i;
     const u32 *fw_ptr = firmware_ptr;
 
     /* stop sequencers */
     spider_net_write_reg(card, SPIDER_NET_GSINIT,
                  SPIDER_NET_STOP_SEQ_VALUE);
 
     for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
          sequencer++) {
         spider_net_write_reg(card,
                      SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
         for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
             spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
                          sequencer * 8, *fw_ptr);
             fw_ptr++;
         }
     }
 
     if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
         return -EIO;
 
     spider_net_write_reg(card, SPIDER_NET_GSINIT,
                  SPIDER_NET_RUN_SEQ_VALUE);
 
     return 0;
 }
 
 /**
  * spider_net_init_firmware - reads in firmware parts
  * @card: card structure
  *
  * Returns 0 on success, <0 on failure
  *
  * spider_net_init_firmware opens the sequencer firmware and does some basic
  * checks. This function opens and releases the firmware structure. A call
  * to download the firmware is performed before the release.
  *
  * Firmware format
  * ===============
  * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
  * the program for each sequencer. Use the command
  *    tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt              \
  *         Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt   \
  *         Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
  *
  * to generate spider_fw.bin, if you have sequencer programs with something
  * like the following contents for each sequencer:
  *    <ONE LINE COMMENT>
  *    <FIRST 4-BYTES-WORD FOR SEQUENCER>
  *    <SECOND 4-BYTES-WORD FOR SEQUENCER>
  *     ...
  *    <1024th 4-BYTES-WORD FOR SEQUENCER>
  */
 static int
 spider_net_init_firmware(struct spider_net_card *card)
 {
     struct firmware *firmware = NULL;
     struct device_node *dn;
     const u8 *fw_prop = NULL;
     int err = -ENOENT;
     int fw_size;
 
     if (request_firmware((const struct firmware **)&firmware,
                  SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
         if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
              netif_msg_probe(card) ) {
             dev_err(&card->netdev->dev,
                    "Incorrect size of spidernet firmware in " \
                    "filesystem. Looking in host firmware...\n");
             goto try_host_fw;
         }
         err = spider_net_download_firmware(card, firmware->data);
 
         release_firmware(firmware);
         if (err)
             goto try_host_fw;
 
         goto done;
     }
 
 try_host_fw:
     dn = pci_device_to_OF_node(card->pdev);
     if (!dn)
         goto out_err;
 
     fw_prop = of_get_property(dn, "firmware", &fw_size);
     if (!fw_prop)
         goto out_err;
 
     if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
          netif_msg_probe(card) ) {
         dev_err(&card->netdev->dev,
                "Incorrect size of spidernet firmware in host firmware\n");
         goto done;
     }
 
     err = spider_net_download_firmware(card, fw_prop);
 
 done:
     return err;
 out_err:
     if (netif_msg_probe(card))
         dev_err(&card->netdev->dev,
                "Couldn't find spidernet firmware in filesystem " \
                "or host firmware\n");
     return err;
 }
 
 /**
  * spider_net_open - called upon ifonfig up
  * @netdev: interface device structure
  *
  * returns 0 on success, <0 on failure
  *
  * spider_net_open allocates all the descriptors and memory needed for
  * operation, sets up multicast list and enables interrupts
  */
 int
 spider_net_open(struct net_device *netdev)
 {
     struct spider_net_card *card = netdev_priv(netdev);
     int result;
 
     result = spider_net_init_firmware(card);
     if (result)
         goto init_firmware_failed;
 
     /* start probing with copper */
     card->aneg_count = 0;
     card->medium = BCM54XX_COPPER;
     spider_net_setup_aneg(card);
     if (card->phy.def->phy_id)
         mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
 
     result = spider_net_init_chain(card, &card->tx_chain);
     if (result)
         goto alloc_tx_failed;
     card->low_watermark = NULL;
 
     result = spider_net_init_chain(card, &card->rx_chain);
     if (result)
         goto alloc_rx_failed;
 
     /* Allocate rx skbs */
     result = spider_net_alloc_rx_skbs(card);
     if (result)
         goto alloc_skbs_failed;
 
     spider_net_set_multi(netdev);
 
     /* further enhancement: setup hw vlan, if needed */
 
     result = -EBUSY;
     if (request_irq(netdev->irq, spider_net_interrupt,
                  IRQF_SHARED, netdev->name, netdev))
         goto register_int_failed;
 
     spider_net_enable_card(card);
 
     netif_start_queue(netdev);
     netif_carrier_on(netdev);
     napi_enable(&card->napi);
 
     spider_net_enable_interrupts(card);
 
     return 0;
 
 register_int_failed:
     spider_net_free_rx_chain_contents(card);
 alloc_skbs_failed:
     spider_net_free_chain(card, &card->rx_chain);
 alloc_rx_failed:
     spider_net_free_chain(card, &card->tx_chain);
 alloc_tx_failed:
     del_timer_sync(&card->aneg_timer);
 init_firmware_failed:
     return result;
 }
 
 /**
  * spider_net_link_phy
  * @t: timer context used to obtain the pointer to net card data structure
  */
 static void spider_net_link_phy(struct timer_list *t)
 {
     struct spider_net_card *card = from_timer(card, t, aneg_timer);
     struct mii_phy *phy = &card->phy;
 
     /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
     if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {
 
         pr_debug("%s: link is down trying to bring it up\n",
              card->netdev->name);
 
         switch (card->medium) {
         case BCM54XX_COPPER:
             /* enable fiber with autonegotiation first */
             if (phy->def->ops->enable_fiber)
                 phy->def->ops->enable_fiber(phy, 1);
             card->medium = BCM54XX_FIBER;
             break;
 
         case BCM54XX_FIBER:
             /* fiber didn't come up, try to disable fiber autoneg */
             if (phy->def->ops->enable_fiber)
                 phy->def->ops->enable_fiber(phy, 0);
             card->medium = BCM54XX_UNKNOWN;
             break;
 
         case BCM54XX_UNKNOWN:
             /* copper, fiber with and without failed,
              * retry from beginning
              */
             spider_net_setup_aneg(card);
             card->medium = BCM54XX_COPPER;
             break;
         }
 
         card->aneg_count = 0;
         mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
         return;
     }
 
     /* link still not up, try again later */
     if (!(phy->def->ops->poll_link(phy))) {
         card->aneg_count++;
         mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
         return;
     }
 
     /* link came up, get abilities */
     phy->def->ops->read_link(phy);
 
     spider_net_write_reg(card, SPIDER_NET_GMACST,
                  spider_net_read_reg(card, SPIDER_NET_GMACST));
     spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);
 
     if (phy->speed == 1000)
         spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
     else
         spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);
 
     card->aneg_count = 0;
 
     pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n",
         card->netdev->name, phy->speed,
         phy->duplex == 1 ? "Full" : "Half",
         phy->autoneg == 1 ? "" : "no ");
 }
 
 /**
  * spider_net_setup_phy - setup PHY
  * @card: card structure
  *
  * returns 0 on success, <0 on failure
  *
  * spider_net_setup_phy is used as part of spider_net_probe.
  **/
 static int
 spider_net_setup_phy(struct spider_net_card *card)
 {
     struct mii_phy *phy = &card->phy;
 
     spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
                  SPIDER_NET_DMASEL_VALUE);
     spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
                  SPIDER_NET_PHY_CTRL_VALUE);
 
     phy->dev = card->netdev;
     phy->mdio_read = spider_net_read_phy;
     phy->mdio_write = spider_net_write_phy;
 
     for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
         unsigned short id;
         id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
         if (id != 0x0000 && id != 0xffff) {
             if (!sungem_phy_probe(phy, phy->mii_id)) {
                 pr_info("Found %s.\n", phy->def->name);
                 break;
             }
         }
     }
 
     return 0;
 }
 
 /**
  * spider_net_workaround_rxramfull - work around firmware bug
  * @card: card structure
  *
  * no return value
  **/
 static void
 spider_net_workaround_rxramfull(struct spider_net_card *card)
 {
     int i, sequencer = 0;
 
     /* cancel reset */
     spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
                  SPIDER_NET_CKRCTRL_RUN_VALUE);
 
     /* empty sequencer data */
     for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
          sequencer++) {
         spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
                      sequencer * 8, 0x0);
         for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
             spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
                          sequencer * 8, 0x0);
         }
     }
 
     /* set sequencer operation */
     spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
 
     /* reset */
     spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
                  SPIDER_NET_CKRCTRL_STOP_VALUE);
 }
 
 /**
  * spider_net_stop - called upon ifconfig down
  * @netdev: interface device structure
  *
  * always returns 0
  */
 int
 spider_net_stop(struct net_device *netdev)
 {
     struct spider_net_card *card = netdev_priv(netdev);
 
     napi_disable(&card->napi);
     netif_carrier_off(netdev);
     netif_stop_queue(netdev);
     del_timer_sync(&card->tx_timer);
     del_timer_sync(&card->aneg_timer);
 
     spider_net_disable_interrupts(card);
 
     free_irq(netdev->irq, netdev);
 
     spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
                  SPIDER_NET_DMA_TX_FEND_VALUE);
 
     /* turn off DMA, force end */
     spider_net_disable_rxdmac(card);
 
     /* release chains */
     spider_net_release_tx_chain(card, 1);
     spider_net_free_rx_chain_contents(card);
 
     spider_net_free_chain(card, &card->tx_chain);
     spider_net_free_chain(card, &card->rx_chain);
 
     return 0;
 }
 
 /**
  * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
  * function (to be called not under interrupt status)
  * @work: work context used to obtain the pointer to net card data structure
  *
  * called as task when tx hangs, resets interface (if interface is up)
  */
 static void
 spider_net_tx_timeout_task(struct work_struct *work)
 {
     struct spider_net_card *card =
         container_of(work, struct spider_net_card, tx_timeout_task);
     struct net_device *netdev = card->netdev;
 
     if (!(netdev->flags & IFF_UP))
         goto out;
 
     netif_device_detach(netdev);
     spider_net_stop(netdev);
 
     spider_net_workaround_rxramfull(card);
     spider_net_init_card(card);
 
     if (spider_net_setup_phy(card))
         goto out;
 
     spider_net_open(netdev);
     spider_net_kick_tx_dma(card);
     netif_device_attach(netdev);
 
 out:
     atomic_dec(&card->tx_timeout_task_counter);
 }
 
 /**
  * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
  * @netdev: interface device structure
  * @txqueue: unused
  *
  * called, if tx hangs. Schedules a task that resets the interface
  */
 static void
 spider_net_tx_timeout(struct net_device *netdev, unsigned int txqueue)
 {
     struct spider_net_card *card;
 
     card = netdev_priv(netdev);
     atomic_inc(&card->tx_timeout_task_counter);
     if (netdev->flags & IFF_UP)
         schedule_work(&card->tx_timeout_task);
     else
         atomic_dec(&card->tx_timeout_task_counter);
     card->spider_stats.tx_timeouts++;
 }
 
 static const struct net_device_ops spider_net_ops = {
     .ndo_open       = spider_net_open,
     .ndo_stop       = spider_net_stop,
     .ndo_start_xmit     = spider_net_xmit,
     .ndo_set_rx_mode    = spider_net_set_multi,
     .ndo_set_mac_address    = spider_net_set_mac,
     .ndo_eth_ioctl      = spider_net_do_ioctl,
     .ndo_tx_timeout     = spider_net_tx_timeout,
     .ndo_validate_addr  = eth_validate_addr,
     /* HW VLAN */
 #ifdef CONFIG_NET_POLL_CONTROLLER
     /* poll controller */
     .ndo_poll_controller    = spider_net_poll_controller,
 #endif /* CONFIG_NET_POLL_CONTROLLER */
 };
 
 /**
  * spider_net_setup_netdev_ops - initialization of net_device operations
  * @netdev: net_device structure
  *
  * fills out function pointers in the net_device structure
  */
 static void
 spider_net_setup_netdev_ops(struct net_device *netdev)
 {
     netdev->netdev_ops = &spider_net_ops;
     netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
     /* ethtool ops */
     netdev->ethtool_ops = &spider_net_ethtool_ops;
 }
 
 /**
  * spider_net_setup_netdev - initialization of net_device
  * @card: card structure
  *
  * Returns 0 on success or <0 on failure
  *
  * spider_net_setup_netdev initializes the net_device structure
  **/
 static int
 spider_net_setup_netdev(struct spider_net_card *card)
 {
     int result;
     struct net_device *netdev = card->netdev;
     struct device_node *dn;
     struct sockaddr addr;
     const u8 *mac;
 
     SET_NETDEV_DEV(netdev, &card->pdev->dev);
 
     pci_set_drvdata(card->pdev, netdev);
 
     timer_setup(&card->tx_timer, spider_net_cleanup_tx_ring, 0);
     netdev->irq = card->pdev->irq;
 
     card->aneg_count = 0;
     timer_setup(&card->aneg_timer, spider_net_link_phy, 0);
 
     netif_napi_add(netdev, &card->napi,
                spider_net_poll, NAPI_POLL_WEIGHT);
 
     spider_net_setup_netdev_ops(netdev);
 
     netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
     if (SPIDER_NET_RX_CSUM_DEFAULT)
         netdev->features |= NETIF_F_RXCSUM;
     netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX;
     /* some time: NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
      *      NETIF_F_HW_VLAN_CTAG_FILTER
      */
 
     /* MTU range: 64 - 2294 */
     netdev->min_mtu = SPIDER_NET_MIN_MTU;
     netdev->max_mtu = SPIDER_NET_MAX_MTU;
 
     netdev->irq = card->pdev->irq;
     card->num_rx_ints = 0;
     card->ignore_rx_ramfull = 0;
 
     dn = pci_device_to_OF_node(card->pdev);
     if (!dn)
         return -EIO;
 
     mac = of_get_property(dn, "local-mac-address", NULL);
     if (!mac)
         return -EIO;
     memcpy(addr.sa_data, mac, ETH_ALEN);
 
     result = spider_net_set_mac(netdev, &addr);
     if ((result) && (netif_msg_probe(card)))
         dev_err(&card->netdev->dev,
                 "Failed to set MAC address: %i\n", result);
 
     result = register_netdev(netdev);
     if (result) {
         if (netif_msg_probe(card))
             dev_err(&card->netdev->dev,
                     "Couldn't register net_device: %i\n", result);
         return result;
     }
 
     if (netif_msg_probe(card))
         pr_info("Initialized device %s.\n", netdev->name);
 
     return 0;
 }
 
 /**
  * spider_net_alloc_card - allocates net_device and card structure
  *
  * returns the card structure or NULL in case of errors
  *
  * the card and net_device structures are linked to each other
  */
 static struct spider_net_card *
 spider_net_alloc_card(void)
 {
     struct net_device *netdev;
     struct spider_net_card *card;
 
     netdev = alloc_etherdev(struct_size(card, darray,
                         tx_descriptors + rx_descriptors));
     if (!netdev)
         return NULL;
 
     card = netdev_priv(netdev);
     card->netdev = netdev;
     card->msg_enable = SPIDER_NET_DEFAULT_MSG;
     INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
     init_waitqueue_head(&card->waitq);
     atomic_set(&card->tx_timeout_task_counter, 0);
 
     card->rx_chain.num_desc = rx_descriptors;
     card->rx_chain.ring = card->darray;
     card->tx_chain.num_desc = tx_descriptors;
     card->tx_chain.ring = card->darray + rx_descriptors;
 
     return card;
 }
 
 /**
  * spider_net_undo_pci_setup - releases PCI ressources
  * @card: card structure
  *
  * spider_net_undo_pci_setup releases the mapped regions
  */
 static void
 spider_net_undo_pci_setup(struct spider_net_card *card)
 {
     iounmap(card->regs);
     pci_release_regions(card->pdev);
 }
 
 /**
  * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
  * @pdev: PCI device
  *
  * Returns the card structure or NULL if any errors occur
  *
  * spider_net_setup_pci_dev initializes pdev and together with the
  * functions called in spider_net_open configures the device so that
  * data can be transferred over it
  * The net_device structure is attached to the card structure, if the
  * function returns without error.
  **/
 static struct spider_net_card *
 spider_net_setup_pci_dev(struct pci_dev *pdev)
 {
     struct spider_net_card *card;
     unsigned long mmio_start, mmio_len;
 
     if (pci_enable_device(pdev)) {
         dev_err(&pdev->dev, "Couldn't enable PCI device\n");
         return NULL;
     }
 
     if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
         dev_err(&pdev->dev,
                 "Couldn't find proper PCI device base address.\n");
         goto out_disable_dev;
     }
 
     if (pci_request_regions(pdev, spider_net_driver_name)) {
         dev_err(&pdev->dev,
                 "Couldn't obtain PCI resources, aborting.\n");
         goto out_disable_dev;
     }
 
     pci_set_master(pdev);
 
     card = spider_net_alloc_card();
     if (!card) {
         dev_err(&pdev->dev,
                 "Couldn't allocate net_device structure, aborting.\n");
         goto out_release_regions;
     }
     card->pdev = pdev;
 
     /* fetch base address and length of first resource */
     mmio_start = pci_resource_start(pdev, 0);
     mmio_len = pci_resource_len(pdev, 0);
 
     card->netdev->mem_start = mmio_start;
     card->netdev->mem_end = mmio_start + mmio_len;
     card->regs = ioremap(mmio_start, mmio_len);
 
     if (!card->regs) {
         dev_err(&pdev->dev,
                 "Couldn't obtain PCI resources, aborting.\n");
         goto out_release_regions;
     }
 
     return card;
 
 out_release_regions:
     pci_release_regions(pdev);
 out_disable_dev:
     pci_disable_device(pdev);
     return NULL;
 }
 
 /**
  * spider_net_probe - initialization of a device
  * @pdev: PCI device
  * @ent: entry in the device id list
  *
  * Returns 0 on success, <0 on failure
  *
  * spider_net_probe initializes pdev and registers a net_device
  * structure for it. After that, the device can be ifconfig'ed up
  **/
 static int
 spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
     int err = -EIO;
     struct spider_net_card *card;
 
     card = spider_net_setup_pci_dev(pdev);
     if (!card)
         goto out;
 
     spider_net_workaround_rxramfull(card);
     spider_net_init_card(card);
 
     err = spider_net_setup_phy(card);
     if (err)
         goto out_undo_pci;
 
     err = spider_net_setup_netdev(card);
     if (err)
         goto out_undo_pci;
 
     return 0;
 
 out_undo_pci:
     spider_net_undo_pci_setup(card);
     free_netdev(card->netdev);
 out:
     return err;
 }
 
 /**
  * spider_net_remove - removal of a device
  * @pdev: PCI device
  *
  * Returns 0 on success, <0 on failure
  *
  * spider_net_remove is called to remove the device and unregisters the
  * net_device
  **/
 static void
 spider_net_remove(struct pci_dev *pdev)
 {
     struct net_device *netdev;
     struct spider_net_card *card;
 
     netdev = pci_get_drvdata(pdev);
     card = netdev_priv(netdev);
 
     wait_event(card->waitq,
            atomic_read(&card->tx_timeout_task_counter) == 0);
 
     unregister_netdev(netdev);
 
     /* switch off card */
     spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
                  SPIDER_NET_CKRCTRL_STOP_VALUE);
     spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
                  SPIDER_NET_CKRCTRL_RUN_VALUE);
 
     spider_net_undo_pci_setup(card);
     free_netdev(netdev);
 }
 
 static struct pci_driver spider_net_driver = {
     .name       = spider_net_driver_name,
     .id_table   = spider_net_pci_tbl,
     .probe      = spider_net_probe,
     .remove     = spider_net_remove
 };
 
 /**
  * spider_net_init - init function when the driver is loaded
  *
  * spider_net_init registers the device driver
  */
 static int __init spider_net_init(void)
 {
     printk(KERN_INFO "Spidernet version %s.\n", VERSION);
 
     if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
         rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
         pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
     }
     if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
         rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
         pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
     }
     if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
         tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
         pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
     }
     if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
         tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
         pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
     }
 
     return pci_register_driver(&spider_net_driver);
 }
 
 /**
  * spider_net_cleanup - exit function when driver is unloaded
  *
  * spider_net_cleanup unregisters the device driver
  */
 static void __exit spider_net_cleanup(void)
 {
     pci_unregister_driver(&spider_net_driver);
 }
 
 module_init(spider_net_init);
 module_exit(spider_net_cleanup);

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