root/drivers/net/ethernet/toshiba/spider_net.c

DEFINITIONS

1. spider_net_read_reg
2. spider_net_write_reg
3. spider_net_write_phy
4. spider_net_read_phy
5. spider_net_setup_aneg
6. spider_net_rx_irq_off
7. spider_net_rx_irq_on
8. spider_net_set_promisc
9. spider_net_get_descr_status
10. spider_net_free_chain
11. spider_net_init_chain
12. spider_net_free_rx_chain_contents
13. spider_net_prepare_rx_descr
14. spider_net_enable_rxchtails
15. spider_net_enable_rxdmac
16. spider_net_disable_rxdmac
17. spider_net_refill_rx_chain
18. spider_net_alloc_rx_skbs
19. spider_net_get_multicast_hash
20. spider_net_set_multi
21. spider_net_prepare_tx_descr
22. spider_net_set_low_watermark
23. spider_net_release_tx_chain
24. spider_net_kick_tx_dma
25. spider_net_xmit
26. spider_net_cleanup_tx_ring
27. spider_net_do_ioctl
28. spider_net_pass_skb_up
29. show_rx_chain
30. spider_net_resync_head_ptr
31. spider_net_resync_tail_ptr
32. spider_net_decode_one_descr
33. spider_net_poll
34. spider_net_set_mac
35. spider_net_link_reset
36. spider_net_handle_error_irq
37. spider_net_interrupt
38. spider_net_poll_controller
39. spider_net_enable_interrupts
40. spider_net_disable_interrupts
41. spider_net_init_card
42. spider_net_enable_card
43. spider_net_download_firmware
44. spider_net_init_firmware
45. spider_net_open
46. spider_net_link_phy
47. spider_net_setup_phy
48. spider_net_workaround_rxramfull
49. spider_net_stop
50. spider_net_tx_timeout_task
51. spider_net_tx_timeout
52. spider_net_setup_netdev_ops
53. spider_net_setup_netdev
54. spider_net_alloc_card
55. spider_net_undo_pci_setup
56. spider_net_setup_pci_dev
57. spider_net_probe
58. spider_net_remove
59. spider_net_init
60. spider_net_cleanup

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Network device driver for Cell Processor-Based Blade and Celleb platform
   4  *
   5  * (C) Copyright IBM Corp. 2005
   6  * (C) Copyright 2006 TOSHIBA CORPORATION
   7  *
   8  * Authors : Utz Bacher <utz.bacher@de.ibm.com>
   9  *           Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
  10  */
  11 
  12 #include <linux/compiler.h>
  13 #include <linux/crc32.h>
  14 #include <linux/delay.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/ethtool.h>
  17 #include <linux/firmware.h>
  18 #include <linux/if_vlan.h>
  19 #include <linux/in.h>
  20 #include <linux/init.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/gfp.h>
  23 #include <linux/ioport.h>
  24 #include <linux/ip.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mii.h>
  27 #include <linux/module.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/device.h>
  30 #include <linux/pci.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/tcp.h>
  33 #include <linux/types.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/wait.h>
  36 #include <linux/workqueue.h>
  37 #include <linux/bitops.h>
  38 #include <net/checksum.h>
  39 
  40 #include "spider_net.h"
  41 
  42 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
  43               "<Jens.Osterkamp@de.ibm.com>");
  44 MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
  45 MODULE_LICENSE("GPL");
  46 MODULE_VERSION(VERSION);
  47 MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME);
  48 
  49 static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
  50 static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
  51 
  52 module_param(rx_descriptors, int, 0444);
  53 module_param(tx_descriptors, int, 0444);
  54 
  55 MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
  56                  "in rx chains");
  57 MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
  58                  "in tx chain");
  59 
  60 char spider_net_driver_name[] = "spidernet";
  61 
  62 static const struct pci_device_id spider_net_pci_tbl[] = {
  63         { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
  64           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
  65         { 0, }
  66 };
  67 
  68 MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
  69 
  70 /**
  71  * spider_net_read_reg - reads an SMMIO register of a card
  72  * @card: device structure
  73  * @reg: register to read from
  74  *
  75  * returns the content of the specified SMMIO register.
  76  */
  77 static inline u32
  78 spider_net_read_reg(struct spider_net_card *card, u32 reg)
  79 {
  80         /* We use the powerpc specific variants instead of readl_be() because
  81          * we know spidernet is not a real PCI device and we can thus avoid the
  82          * performance hit caused by the PCI workarounds.
  83          */
  84         return in_be32(card->regs + reg);
  85 }
  86 
  87 /**
  88  * spider_net_write_reg - writes to an SMMIO register of a card
  89  * @card: device structure
  90  * @reg: register to write to
  91  * @value: value to write into the specified SMMIO register
  92  */
  93 static inline void
  94 spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
  95 {
  96         /* We use the powerpc specific variants instead of writel_be() because
  97          * we know spidernet is not a real PCI device and we can thus avoid the
  98          * performance hit caused by the PCI workarounds.
  99          */
 100         out_be32(card->regs + reg, value);
 101 }
 102 
 103 /**
 104  * spider_net_write_phy - write to phy register
 105  * @netdev: adapter to be written to
 106  * @mii_id: id of MII
 107  * @reg: PHY register
 108  * @val: value to be written to phy register
 109  *
 110  * spider_net_write_phy_register writes to an arbitrary PHY
 111  * register via the spider GPCWOPCMD register. We assume the queue does
 112  * not run full (not more than 15 commands outstanding).
 113  **/
 114 static void
 115 spider_net_write_phy(struct net_device *netdev, int mii_id,
 116                      int reg, int val)
 117 {
 118         struct spider_net_card *card = netdev_priv(netdev);
 119         u32 writevalue;
 120 
 121         writevalue = ((u32)mii_id << 21) |
 122                 ((u32)reg << 16) | ((u32)val);
 123 
 124         spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
 125 }
 126 
 127 /**
 128  * spider_net_read_phy - read from phy register
 129  * @netdev: network device to be read from
 130  * @mii_id: id of MII
 131  * @reg: PHY register
 132  *
 133  * Returns value read from PHY register
 134  *
 135  * spider_net_write_phy reads from an arbitrary PHY
 136  * register via the spider GPCROPCMD register
 137  **/
 138 static int
 139 spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
 140 {
 141         struct spider_net_card *card = netdev_priv(netdev);
 142         u32 readvalue;
 143 
 144         readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
 145         spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
 146 
 147         /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
 148          * interrupt, as we poll for the completion of the read operation
 149          * in spider_net_read_phy. Should take about 50 us */
 150         do {
 151                 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
 152         } while (readvalue & SPIDER_NET_GPREXEC);
 153 
 154         readvalue &= SPIDER_NET_GPRDAT_MASK;
 155 
 156         return readvalue;
 157 }
 158 
 159 /**
 160  * spider_net_setup_aneg - initial auto-negotiation setup
 161  * @card: device structure
 162  **/
 163 static void
 164 spider_net_setup_aneg(struct spider_net_card *card)
 165 {
 166         struct mii_phy *phy = &card->phy;
 167         u32 advertise = 0;
 168         u16 bmsr, estat;
 169 
 170         bmsr  = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
 171         estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);
 172 
 173         if (bmsr & BMSR_10HALF)
 174                 advertise |= ADVERTISED_10baseT_Half;
 175         if (bmsr & BMSR_10FULL)
 176                 advertise |= ADVERTISED_10baseT_Full;
 177         if (bmsr & BMSR_100HALF)
 178                 advertise |= ADVERTISED_100baseT_Half;
 179         if (bmsr & BMSR_100FULL)
 180                 advertise |= ADVERTISED_100baseT_Full;
 181 
 182         if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
 183                 advertise |= SUPPORTED_1000baseT_Full;
 184         if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
 185                 advertise |= SUPPORTED_1000baseT_Half;
 186 
 187         sungem_phy_probe(phy, phy->mii_id);
 188         phy->def->ops->setup_aneg(phy, advertise);
 189 
 190 }
 191 
 192 /**
 193  * spider_net_rx_irq_off - switch off rx irq on this spider card
 194  * @card: device structure
 195  *
 196  * switches off rx irq by masking them out in the GHIINTnMSK register
 197  */
 198 static void
 199 spider_net_rx_irq_off(struct spider_net_card *card)
 200 {
 201         u32 regvalue;
 202 
 203         regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
 204         spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
 205 }
 206 
 207 /**
 208  * spider_net_rx_irq_on - switch on rx irq on this spider card
 209  * @card: device structure
 210  *
 211  * switches on rx irq by enabling them in the GHIINTnMSK register
 212  */
 213 static void
 214 spider_net_rx_irq_on(struct spider_net_card *card)
 215 {
 216         u32 regvalue;
 217 
 218         regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
 219         spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
 220 }
 221 
 222 /**
 223  * spider_net_set_promisc - sets the unicast address or the promiscuous mode
 224  * @card: card structure
 225  *
 226  * spider_net_set_promisc sets the unicast destination address filter and
 227  * thus either allows for non-promisc mode or promisc mode
 228  */
 229 static void
 230 spider_net_set_promisc(struct spider_net_card *card)
 231 {
 232         u32 macu, macl;
 233         struct net_device *netdev = card->netdev;
 234 
 235         if (netdev->flags & IFF_PROMISC) {
 236                 /* clear destination entry 0 */
 237                 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
 238                 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
 239                 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
 240                                      SPIDER_NET_PROMISC_VALUE);
 241         } else {
 242                 macu = netdev->dev_addr[0];
 243                 macu <<= 8;
 244                 macu |= netdev->dev_addr[1];
 245                 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
 246 
 247                 macu |= SPIDER_NET_UA_DESCR_VALUE;
 248                 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
 249                 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
 250                 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
 251                                      SPIDER_NET_NONPROMISC_VALUE);
 252         }
 253 }
 254 
 255 /**
 256  * spider_net_get_descr_status -- returns the status of a descriptor
 257  * @descr: descriptor to look at
 258  *
 259  * returns the status as in the dmac_cmd_status field of the descriptor
 260  */
 261 static inline int
 262 spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
 263 {
 264         return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
 265 }
 266 
 267 /**
 268  * spider_net_free_chain - free descriptor chain
 269  * @card: card structure
 270  * @chain: address of chain
 271  *
 272  */
 273 static void
 274 spider_net_free_chain(struct spider_net_card *card,
 275                       struct spider_net_descr_chain *chain)
 276 {
 277         struct spider_net_descr *descr;
 278 
 279         descr = chain->ring;
 280         do {
 281                 descr->bus_addr = 0;
 282                 descr->hwdescr->next_descr_addr = 0;
 283                 descr = descr->next;
 284         } while (descr != chain->ring);
 285 
 286         dma_free_coherent(&card->pdev->dev, chain->num_desc,
 287             chain->hwring, chain->dma_addr);
 288 }
 289 
 290 /**
 291  * spider_net_init_chain - alloc and link descriptor chain
 292  * @card: card structure
 293  * @chain: address of chain
 294  *
 295  * We manage a circular list that mirrors the hardware structure,
 296  * except that the hardware uses bus addresses.
 297  *
 298  * Returns 0 on success, <0 on failure
 299  */
 300 static int
 301 spider_net_init_chain(struct spider_net_card *card,
 302                        struct spider_net_descr_chain *chain)
 303 {
 304         int i;
 305         struct spider_net_descr *descr;
 306         struct spider_net_hw_descr *hwdescr;
 307         dma_addr_t buf;
 308         size_t alloc_size;
 309 
 310         alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
 311 
 312         chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
 313                                            &chain->dma_addr, GFP_KERNEL);
 314         if (!chain->hwring)
 315                 return -ENOMEM;
 316 
 317         memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr));
 318 
 319         /* Set up the hardware pointers in each descriptor */
 320         descr = chain->ring;
 321         hwdescr = chain->hwring;
 322         buf = chain->dma_addr;
 323         for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {
 324                 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
 325                 hwdescr->next_descr_addr = 0;
 326 
 327                 descr->hwdescr = hwdescr;
 328                 descr->bus_addr = buf;
 329                 descr->next = descr + 1;
 330                 descr->prev = descr - 1;
 331 
 332                 buf += sizeof(struct spider_net_hw_descr);
 333         }
 334         /* do actual circular list */
 335         (descr-1)->next = chain->ring;
 336         chain->ring->prev = descr-1;
 337 
 338         spin_lock_init(&chain->lock);
 339         chain->head = chain->ring;
 340         chain->tail = chain->ring;
 341         return 0;
 342 }
 343 
 344 /**
 345  * spider_net_free_rx_chain_contents - frees descr contents in rx chain
 346  * @card: card structure
 347  *
 348  * returns 0 on success, <0 on failure
 349  */
 350 static void
 351 spider_net_free_rx_chain_contents(struct spider_net_card *card)
 352 {
 353         struct spider_net_descr *descr;
 354 
 355         descr = card->rx_chain.head;
 356         do {
 357                 if (descr->skb) {
 358                         pci_unmap_single(card->pdev, descr->hwdescr->buf_addr,
 359                                          SPIDER_NET_MAX_FRAME,
 360                                          PCI_DMA_BIDIRECTIONAL);
 361                         dev_kfree_skb(descr->skb);
 362                         descr->skb = NULL;
 363                 }
 364                 descr = descr->next;
 365         } while (descr != card->rx_chain.head);
 366 }
 367 
 368 /**
 369  * spider_net_prepare_rx_descr - Reinitialize RX descriptor
 370  * @card: card structure
 371  * @descr: descriptor to re-init
 372  *
 373  * Return 0 on success, <0 on failure.
 374  *
 375  * Allocates a new rx skb, iommu-maps it and attaches it to the
 376  * descriptor. Mark the descriptor as activated, ready-to-use.
 377  */
 378 static int
 379 spider_net_prepare_rx_descr(struct spider_net_card *card,
 380                             struct spider_net_descr *descr)
 381 {
 382         struct spider_net_hw_descr *hwdescr = descr->hwdescr;
 383         dma_addr_t buf;
 384         int offset;
 385         int bufsize;
 386 
 387         /* we need to round up the buffer size to a multiple of 128 */
 388         bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
 389                 (~(SPIDER_NET_RXBUF_ALIGN - 1));
 390 
 391         /* and we need to have it 128 byte aligned, therefore we allocate a
 392          * bit more */
 393         /* allocate an skb */
 394         descr->skb = netdev_alloc_skb(card->netdev,
 395                                       bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
 396         if (!descr->skb) {
 397                 if (netif_msg_rx_err(card) && net_ratelimit())
 398                         dev_err(&card->netdev->dev,
 399                                 "Not enough memory to allocate rx buffer\n");
 400                 card->spider_stats.alloc_rx_skb_error++;
 401                 return -ENOMEM;
 402         }
 403         hwdescr->buf_size = bufsize;
 404         hwdescr->result_size = 0;
 405         hwdescr->valid_size = 0;
 406         hwdescr->data_status = 0;
 407         hwdescr->data_error = 0;
 408 
 409         offset = ((unsigned long)descr->skb->data) &
 410                 (SPIDER_NET_RXBUF_ALIGN - 1);
 411         if (offset)
 412                 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
 413         /* iommu-map the skb */
 414         buf = pci_map_single(card->pdev, descr->skb->data,
 415                         SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
 416         if (pci_dma_mapping_error(card->pdev, buf)) {
 417                 dev_kfree_skb_any(descr->skb);
 418                 descr->skb = NULL;
 419                 if (netif_msg_rx_err(card) && net_ratelimit())
 420                         dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n");
 421                 card->spider_stats.rx_iommu_map_error++;
 422                 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
 423         } else {
 424                 hwdescr->buf_addr = buf;
 425                 wmb();
 426                 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
 427                                          SPIDER_NET_DMAC_NOINTR_COMPLETE;
 428         }
 429 
 430         return 0;
 431 }
 432 
 433 /**
 434  * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
 435  * @card: card structure
 436  *
 437  * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
 438  * chip by writing to the appropriate register. DMA is enabled in
 439  * spider_net_enable_rxdmac.
 440  */
 441 static inline void
 442 spider_net_enable_rxchtails(struct spider_net_card *card)
 443 {
 444         /* assume chain is aligned correctly */
 445         spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
 446                              card->rx_chain.tail->bus_addr);
 447 }
 448 
 449 /**
 450  * spider_net_enable_rxdmac - enables a receive DMA controller
 451  * @card: card structure
 452  *
 453  * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
 454  * in the GDADMACCNTR register
 455  */
 456 static inline void
 457 spider_net_enable_rxdmac(struct spider_net_card *card)
 458 {
 459         wmb();
 460         spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
 461                              SPIDER_NET_DMA_RX_VALUE);
 462 }
 463 
 464 /**
 465  * spider_net_disable_rxdmac - disables the receive DMA controller
 466  * @card: card structure
 467  *
 468  * spider_net_disable_rxdmac terminates processing on the DMA controller
 469  * by turing off the DMA controller, with the force-end flag set.
 470  */
 471 static inline void
 472 spider_net_disable_rxdmac(struct spider_net_card *card)
 473 {
 474         spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
 475                              SPIDER_NET_DMA_RX_FEND_VALUE);
 476 }
 477 
 478 /**
 479  * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
 480  * @card: card structure
 481  *
 482  * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
 483  */
 484 static void
 485 spider_net_refill_rx_chain(struct spider_net_card *card)
 486 {
 487         struct spider_net_descr_chain *chain = &card->rx_chain;
 488         unsigned long flags;
 489 
 490         /* one context doing the refill (and a second context seeing that
 491          * and omitting it) is ok. If called by NAPI, we'll be called again
 492          * as spider_net_decode_one_descr is called several times. If some
 493          * interrupt calls us, the NAPI is about to clean up anyway. */
 494         if (!spin_trylock_irqsave(&chain->lock, flags))
 495                 return;
 496 
 497         while (spider_net_get_descr_status(chain->head->hwdescr) ==
 498                         SPIDER_NET_DESCR_NOT_IN_USE) {
 499                 if (spider_net_prepare_rx_descr(card, chain->head))
 500                         break;
 501                 chain->head = chain->head->next;
 502         }
 503 
 504         spin_unlock_irqrestore(&chain->lock, flags);
 505 }
 506 
 507 /**
 508  * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
 509  * @card: card structure
 510  *
 511  * Returns 0 on success, <0 on failure.
 512  */
 513 static int
 514 spider_net_alloc_rx_skbs(struct spider_net_card *card)
 515 {
 516         struct spider_net_descr_chain *chain = &card->rx_chain;
 517         struct spider_net_descr *start = chain->tail;
 518         struct spider_net_descr *descr = start;
 519 
 520         /* Link up the hardware chain pointers */
 521         do {
 522                 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
 523                 descr = descr->next;
 524         } while (descr != start);
 525 
 526         /* Put at least one buffer into the chain. if this fails,
 527          * we've got a problem. If not, spider_net_refill_rx_chain
 528          * will do the rest at the end of this function. */
 529         if (spider_net_prepare_rx_descr(card, chain->head))
 530                 goto error;
 531         else
 532                 chain->head = chain->head->next;
 533 
 534         /* This will allocate the rest of the rx buffers;
 535          * if not, it's business as usual later on. */
 536         spider_net_refill_rx_chain(card);
 537         spider_net_enable_rxdmac(card);
 538         return 0;
 539 
 540 error:
 541         spider_net_free_rx_chain_contents(card);
 542         return -ENOMEM;
 543 }
 544 
 545 /**
 546  * spider_net_get_multicast_hash - generates hash for multicast filter table
 547  * @addr: multicast address
 548  *
 549  * returns the hash value.
 550  *
 551  * spider_net_get_multicast_hash calculates a hash value for a given multicast
 552  * address, that is used to set the multicast filter tables
 553  */
 554 static u8
 555 spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
 556 {
 557         u32 crc;
 558         u8 hash;
 559         char addr_for_crc[ETH_ALEN] = { 0, };
 560         int i, bit;
 561 
 562         for (i = 0; i < ETH_ALEN * 8; i++) {
 563                 bit = (addr[i / 8] >> (i % 8)) & 1;
 564                 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
 565         }
 566 
 567         crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
 568 
 569         hash = (crc >> 27);
 570         hash <<= 3;
 571         hash |= crc & 7;
 572         hash &= 0xff;
 573 
 574         return hash;
 575 }
 576 
 577 /**
 578  * spider_net_set_multi - sets multicast addresses and promisc flags
 579  * @netdev: interface device structure
 580  *
 581  * spider_net_set_multi configures multicast addresses as needed for the
 582  * netdev interface. It also sets up multicast, allmulti and promisc
 583  * flags appropriately
 584  */
 585 static void
 586 spider_net_set_multi(struct net_device *netdev)
 587 {
 588         struct netdev_hw_addr *ha;
 589         u8 hash;
 590         int i;
 591         u32 reg;
 592         struct spider_net_card *card = netdev_priv(netdev);
 593         DECLARE_BITMAP(bitmask, SPIDER_NET_MULTICAST_HASHES) = {};
 594 
 595         spider_net_set_promisc(card);
 596 
 597         if (netdev->flags & IFF_ALLMULTI) {
 598                 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
 599                         set_bit(i, bitmask);
 600                 }
 601                 goto write_hash;
 602         }
 603 
 604         /* well, we know, what the broadcast hash value is: it's xfd
 605         hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
 606         set_bit(0xfd, bitmask);
 607 
 608         netdev_for_each_mc_addr(ha, netdev) {
 609                 hash = spider_net_get_multicast_hash(netdev, ha->addr);
 610                 set_bit(hash, bitmask);
 611         }
 612 
 613 write_hash:
 614         for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
 615                 reg = 0;
 616                 if (test_bit(i * 4, bitmask))
 617                         reg += 0x08;
 618                 reg <<= 8;
 619                 if (test_bit(i * 4 + 1, bitmask))
 620                         reg += 0x08;
 621                 reg <<= 8;
 622                 if (test_bit(i * 4 + 2, bitmask))
 623                         reg += 0x08;
 624                 reg <<= 8;
 625                 if (test_bit(i * 4 + 3, bitmask))
 626                         reg += 0x08;
 627 
 628                 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
 629         }
 630 }
 631 
 632 /**
 633  * spider_net_prepare_tx_descr - fill tx descriptor with skb data
 634  * @card: card structure
 635  * @skb: packet to use
 636  *
 637  * returns 0 on success, <0 on failure.
 638  *
 639  * fills out the descriptor structure with skb data and len. Copies data,
 640  * if needed (32bit DMA!)
 641  */
 642 static int
 643 spider_net_prepare_tx_descr(struct spider_net_card *card,
 644                             struct sk_buff *skb)
 645 {
 646         struct spider_net_descr_chain *chain = &card->tx_chain;
 647         struct spider_net_descr *descr;
 648         struct spider_net_hw_descr *hwdescr;
 649         dma_addr_t buf;
 650         unsigned long flags;
 651 
 652         buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
 653         if (pci_dma_mapping_error(card->pdev, buf)) {
 654                 if (netif_msg_tx_err(card) && net_ratelimit())
 655                         dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). "
 656                                   "Dropping packet\n", skb->data, skb->len);
 657                 card->spider_stats.tx_iommu_map_error++;
 658                 return -ENOMEM;
 659         }
 660 
 661         spin_lock_irqsave(&chain->lock, flags);
 662         descr = card->tx_chain.head;
 663         if (descr->next == chain->tail->prev) {
 664                 spin_unlock_irqrestore(&chain->lock, flags);
 665                 pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE);
 666                 return -ENOMEM;
 667         }
 668         hwdescr = descr->hwdescr;
 669         chain->head = descr->next;
 670 
 671         descr->skb = skb;
 672         hwdescr->buf_addr = buf;
 673         hwdescr->buf_size = skb->len;
 674         hwdescr->next_descr_addr = 0;
 675         hwdescr->data_status = 0;
 676 
 677         hwdescr->dmac_cmd_status =
 678                         SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL;
 679         spin_unlock_irqrestore(&chain->lock, flags);
 680 
 681         if (skb->ip_summed == CHECKSUM_PARTIAL)
 682                 switch (ip_hdr(skb)->protocol) {
 683                 case IPPROTO_TCP:
 684                         hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
 685                         break;
 686                 case IPPROTO_UDP:
 687                         hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
 688                         break;
 689                 }
 690 
 691         /* Chain the bus address, so that the DMA engine finds this descr. */
 692         wmb();
 693         descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
 694 
 695         netif_trans_update(card->netdev); /* set netdev watchdog timer */
 696         return 0;
 697 }
 698 
 699 static int
 700 spider_net_set_low_watermark(struct spider_net_card *card)
 701 {
 702         struct spider_net_descr *descr = card->tx_chain.tail;
 703         struct spider_net_hw_descr *hwdescr;
 704         unsigned long flags;
 705         int status;
 706         int cnt=0;
 707         int i;
 708 
 709         /* Measure the length of the queue. Measurement does not
 710          * need to be precise -- does not need a lock. */
 711         while (descr != card->tx_chain.head) {
 712                 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
 713                 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
 714                         break;
 715                 descr = descr->next;
 716                 cnt++;
 717         }
 718 
 719         /* If TX queue is short, don't even bother with interrupts */
 720         if (cnt < card->tx_chain.num_desc/4)
 721                 return cnt;
 722 
 723         /* Set low-watermark 3/4th's of the way into the queue. */
 724         descr = card->tx_chain.tail;
 725         cnt = (cnt*3)/4;
 726         for (i=0;i<cnt; i++)
 727                 descr = descr->next;
 728 
 729         /* Set the new watermark, clear the old watermark */
 730         spin_lock_irqsave(&card->tx_chain.lock, flags);
 731         descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
 732         if (card->low_watermark && card->low_watermark != descr) {
 733                 hwdescr = card->low_watermark->hwdescr;
 734                 hwdescr->dmac_cmd_status =
 735                      hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
 736         }
 737         card->low_watermark = descr;
 738         spin_unlock_irqrestore(&card->tx_chain.lock, flags);
 739         return cnt;
 740 }
 741 
 742 /**
 743  * spider_net_release_tx_chain - processes sent tx descriptors
 744  * @card: adapter structure
 745  * @brutal: if set, don't care about whether descriptor seems to be in use
 746  *
 747  * returns 0 if the tx ring is empty, otherwise 1.
 748  *
 749  * spider_net_release_tx_chain releases the tx descriptors that spider has
 750  * finished with (if non-brutal) or simply release tx descriptors (if brutal).
 751  * If some other context is calling this function, we return 1 so that we're
 752  * scheduled again (if we were scheduled) and will not lose initiative.
 753  */
 754 static int
 755 spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
 756 {
 757         struct net_device *dev = card->netdev;
 758         struct spider_net_descr_chain *chain = &card->tx_chain;
 759         struct spider_net_descr *descr;
 760         struct spider_net_hw_descr *hwdescr;
 761         struct sk_buff *skb;
 762         u32 buf_addr;
 763         unsigned long flags;
 764         int status;
 765 
 766         while (1) {
 767                 spin_lock_irqsave(&chain->lock, flags);
 768                 if (chain->tail == chain->head) {
 769                         spin_unlock_irqrestore(&chain->lock, flags);
 770                         return 0;
 771                 }
 772                 descr = chain->tail;
 773                 hwdescr = descr->hwdescr;
 774 
 775                 status = spider_net_get_descr_status(hwdescr);
 776                 switch (status) {
 777                 case SPIDER_NET_DESCR_COMPLETE:
 778                         dev->stats.tx_packets++;
 779                         dev->stats.tx_bytes += descr->skb->len;
 780                         break;
 781 
 782                 case SPIDER_NET_DESCR_CARDOWNED:
 783                         if (!brutal) {
 784                                 spin_unlock_irqrestore(&chain->lock, flags);
 785                                 return 1;
 786                         }
 787 
 788                         /* fallthrough, if we release the descriptors
 789                          * brutally (then we don't care about
 790                          * SPIDER_NET_DESCR_CARDOWNED) */
 791                         /* Fall through */
 792 
 793                 case SPIDER_NET_DESCR_RESPONSE_ERROR:
 794                 case SPIDER_NET_DESCR_PROTECTION_ERROR:
 795                 case SPIDER_NET_DESCR_FORCE_END:
 796                         if (netif_msg_tx_err(card))
 797                                 dev_err(&card->netdev->dev, "forcing end of tx descriptor "
 798                                        "with status x%02x\n", status);
 799                         dev->stats.tx_errors++;
 800                         break;
 801 
 802                 default:
 803                         dev->stats.tx_dropped++;
 804                         if (!brutal) {
 805                                 spin_unlock_irqrestore(&chain->lock, flags);
 806                                 return 1;
 807                         }
 808                 }
 809 
 810                 chain->tail = descr->next;
 811                 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
 812                 skb = descr->skb;
 813                 descr->skb = NULL;
 814                 buf_addr = hwdescr->buf_addr;
 815                 spin_unlock_irqrestore(&chain->lock, flags);
 816 
 817                 /* unmap the skb */
 818                 if (skb) {
 819                         pci_unmap_single(card->pdev, buf_addr, skb->len,
 820                                         PCI_DMA_TODEVICE);
 821                         dev_consume_skb_any(skb);
 822                 }
 823         }
 824         return 0;
 825 }
 826 
 827 /**
 828  * spider_net_kick_tx_dma - enables TX DMA processing
 829  * @card: card structure
 830  *
 831  * This routine will start the transmit DMA running if
 832  * it is not already running. This routine ned only be
 833  * called when queueing a new packet to an empty tx queue.
 834  * Writes the current tx chain head as start address
 835  * of the tx descriptor chain and enables the transmission
 836  * DMA engine.
 837  */
 838 static inline void
 839 spider_net_kick_tx_dma(struct spider_net_card *card)
 840 {
 841         struct spider_net_descr *descr;
 842 
 843         if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
 844                         SPIDER_NET_TX_DMA_EN)
 845                 goto out;
 846 
 847         descr = card->tx_chain.tail;
 848         for (;;) {
 849                 if (spider_net_get_descr_status(descr->hwdescr) ==
 850                                 SPIDER_NET_DESCR_CARDOWNED) {
 851                         spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
 852                                         descr->bus_addr);
 853                         spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
 854                                         SPIDER_NET_DMA_TX_VALUE);
 855                         break;
 856                 }
 857                 if (descr == card->tx_chain.head)
 858                         break;
 859                 descr = descr->next;
 860         }
 861 
 862 out:
 863         mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
 864 }
 865 
 866 /**
 867  * spider_net_xmit - transmits a frame over the device
 868  * @skb: packet to send out
 869  * @netdev: interface device structure
 870  *
 871  * returns NETDEV_TX_OK on success, NETDEV_TX_BUSY on failure
 872  */
 873 static netdev_tx_t
 874 spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
 875 {
 876         int cnt;
 877         struct spider_net_card *card = netdev_priv(netdev);
 878 
 879         spider_net_release_tx_chain(card, 0);
 880 
 881         if (spider_net_prepare_tx_descr(card, skb) != 0) {
 882                 netdev->stats.tx_dropped++;
 883                 netif_stop_queue(netdev);
 884                 return NETDEV_TX_BUSY;
 885         }
 886 
 887         cnt = spider_net_set_low_watermark(card);
 888         if (cnt < 5)
 889                 spider_net_kick_tx_dma(card);
 890         return NETDEV_TX_OK;
 891 }
 892 
 893 /**
 894  * spider_net_cleanup_tx_ring - cleans up the TX ring
 895  * @card: card structure
 896  *
 897  * spider_net_cleanup_tx_ring is called by either the tx_timer
 898  * or from the NAPI polling routine.
 899  * This routine releases resources associted with transmitted
 900  * packets, including updating the queue tail pointer.
 901  */
 902 static void
 903 spider_net_cleanup_tx_ring(struct timer_list *t)
 904 {
 905         struct spider_net_card *card = from_timer(card, t, tx_timer);
 906         if ((spider_net_release_tx_chain(card, 0) != 0) &&
 907             (card->netdev->flags & IFF_UP)) {
 908                 spider_net_kick_tx_dma(card);
 909                 netif_wake_queue(card->netdev);
 910         }
 911 }
 912 
 913 /**
 914  * spider_net_do_ioctl - called for device ioctls
 915  * @netdev: interface device structure
 916  * @ifr: request parameter structure for ioctl
 917  * @cmd: command code for ioctl
 918  *
 919  * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
 920  * -EOPNOTSUPP is returned, if an unknown ioctl was requested
 921  */
 922 static int
 923 spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 924 {
 925         switch (cmd) {
 926         default:
 927                 return -EOPNOTSUPP;
 928         }
 929 }
 930 
 931 /**
 932  * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
 933  * @descr: descriptor to process
 934  * @card: card structure
 935  *
 936  * Fills out skb structure and passes the data to the stack.
 937  * The descriptor state is not changed.
 938  */
 939 static void
 940 spider_net_pass_skb_up(struct spider_net_descr *descr,
 941                        struct spider_net_card *card)
 942 {
 943         struct spider_net_hw_descr *hwdescr = descr->hwdescr;
 944         struct sk_buff *skb = descr->skb;
 945         struct net_device *netdev = card->netdev;
 946         u32 data_status = hwdescr->data_status;
 947         u32 data_error = hwdescr->data_error;
 948 
 949         skb_put(skb, hwdescr->valid_size);
 950 
 951         /* the card seems to add 2 bytes of junk in front
 952          * of the ethernet frame */
 953 #define SPIDER_MISALIGN         2
 954         skb_pull(skb, SPIDER_MISALIGN);
 955         skb->protocol = eth_type_trans(skb, netdev);
 956 
 957         /* checksum offload */
 958         skb_checksum_none_assert(skb);
 959         if (netdev->features & NETIF_F_RXCSUM) {
 960                 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
 961                        SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
 962                      !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
 963                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 964         }
 965 
 966         if (data_status & SPIDER_NET_VLAN_PACKET) {
 967                 /* further enhancements: HW-accel VLAN */
 968         }
 969 
 970         /* update netdevice statistics */
 971         netdev->stats.rx_packets++;
 972         netdev->stats.rx_bytes += skb->len;
 973 
 974         /* pass skb up to stack */
 975         netif_receive_skb(skb);
 976 }
 977 
 978 static void show_rx_chain(struct spider_net_card *card)
 979 {
 980         struct spider_net_descr_chain *chain = &card->rx_chain;
 981         struct spider_net_descr *start= chain->tail;
 982         struct spider_net_descr *descr= start;
 983         struct spider_net_hw_descr *hwd = start->hwdescr;
 984         struct device *dev = &card->netdev->dev;
 985         u32 curr_desc, next_desc;
 986         int status;
 987 
 988         int tot = 0;
 989         int cnt = 0;
 990         int off = start - chain->ring;
 991         int cstat = hwd->dmac_cmd_status;
 992 
 993         dev_info(dev, "Total number of descrs=%d\n",
 994                 chain->num_desc);
 995         dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
 996                 off, cstat);
 997 
 998         curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
 999         next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
1000 
1001         status = cstat;
1002         do
1003         {
1004                 hwd = descr->hwdescr;
1005                 off = descr - chain->ring;
1006                 status = hwd->dmac_cmd_status;
1007 
1008                 if (descr == chain->head)
1009                         dev_info(dev, "Chain head is at %d, head status=0x%x\n",
1010                                  off, status);
1011 
1012                 if (curr_desc == descr->bus_addr)
1013                         dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
1014                                  off, status);
1015 
1016                 if (next_desc == descr->bus_addr)
1017                         dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
1018                                  off, status);
1019 
1020                 if (hwd->next_descr_addr == 0)
1021                         dev_info(dev, "chain is cut at %d\n", off);
1022 
1023                 if (cstat != status) {
1024                         int from = (chain->num_desc + off - cnt) % chain->num_desc;
1025                         int to = (chain->num_desc + off - 1) % chain->num_desc;
1026                         dev_info(dev, "Have %d (from %d to %d) descrs "
1027                                  "with stat=0x%08x\n", cnt, from, to, cstat);
1028                         cstat = status;
1029                         cnt = 0;
1030                 }
1031 
1032                 cnt ++;
1033                 tot ++;
1034                 descr = descr->next;
1035         } while (descr != start);
1036 
1037         dev_info(dev, "Last %d descrs with stat=0x%08x "
1038                  "for a total of %d descrs\n", cnt, cstat, tot);
1039 
1040 #ifdef DEBUG
1041         /* Now dump the whole ring */
1042         descr = start;
1043         do
1044         {
1045                 struct spider_net_hw_descr *hwd = descr->hwdescr;
1046                 status = spider_net_get_descr_status(hwd);
1047                 cnt = descr - chain->ring;
1048                 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
1049                          cnt, status, descr->skb);
1050                 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
1051                          descr->bus_addr, hwd->buf_addr, hwd->buf_size);
1052                 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
1053                          hwd->next_descr_addr, hwd->result_size,
1054                          hwd->valid_size);
1055                 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
1056                          hwd->dmac_cmd_status, hwd->data_status,
1057                          hwd->data_error);
1058                 dev_info(dev, "\n");
1059 
1060                 descr = descr->next;
1061         } while (descr != start);
1062 #endif
1063 
1064 }
1065 
1066 /**
1067  * spider_net_resync_head_ptr - Advance head ptr past empty descrs
1068  *
1069  * If the driver fails to keep up and empty the queue, then the
1070  * hardware wil run out of room to put incoming packets. This
1071  * will cause the hardware to skip descrs that are full (instead
1072  * of halting/retrying). Thus, once the driver runs, it wil need
1073  * to "catch up" to where the hardware chain pointer is at.
1074  */
1075 static void spider_net_resync_head_ptr(struct spider_net_card *card)
1076 {
1077         unsigned long flags;
1078         struct spider_net_descr_chain *chain = &card->rx_chain;
1079         struct spider_net_descr *descr;
1080         int i, status;
1081 
1082         /* Advance head pointer past any empty descrs */
1083         descr = chain->head;
1084         status = spider_net_get_descr_status(descr->hwdescr);
1085 
1086         if (status == SPIDER_NET_DESCR_NOT_IN_USE)
1087                 return;
1088 
1089         spin_lock_irqsave(&chain->lock, flags);
1090 
1091         descr = chain->head;
1092         status = spider_net_get_descr_status(descr->hwdescr);
1093         for (i=0; i<chain->num_desc; i++) {
1094                 if (status != SPIDER_NET_DESCR_CARDOWNED) break;
1095                 descr = descr->next;
1096                 status = spider_net_get_descr_status(descr->hwdescr);
1097         }
1098         chain->head = descr;
1099 
1100         spin_unlock_irqrestore(&chain->lock, flags);
1101 }
1102 
1103 static int spider_net_resync_tail_ptr(struct spider_net_card *card)
1104 {
1105         struct spider_net_descr_chain *chain = &card->rx_chain;
1106         struct spider_net_descr *descr;
1107         int i, status;
1108 
1109         /* Advance tail pointer past any empty and reaped descrs */
1110         descr = chain->tail;
1111         status = spider_net_get_descr_status(descr->hwdescr);
1112 
1113         for (i=0; i<chain->num_desc; i++) {
1114                 if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
1115                     (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
1116                 descr = descr->next;
1117                 status = spider_net_get_descr_status(descr->hwdescr);
1118         }
1119         chain->tail = descr;
1120 
1121         if ((i == chain->num_desc) || (i == 0))
1122                 return 1;
1123         return 0;
1124 }
1125 
1126 /**
1127  * spider_net_decode_one_descr - processes an RX descriptor
1128  * @card: card structure
1129  *
1130  * Returns 1 if a packet has been sent to the stack, otherwise 0.
1131  *
1132  * Processes an RX descriptor by iommu-unmapping the data buffer
1133  * and passing the packet up to the stack. This function is called
1134  * in softirq context, e.g. either bottom half from interrupt or
1135  * NAPI polling context.
1136  */
1137 static int
1138 spider_net_decode_one_descr(struct spider_net_card *card)
1139 {
1140         struct net_device *dev = card->netdev;
1141         struct spider_net_descr_chain *chain = &card->rx_chain;
1142         struct spider_net_descr *descr = chain->tail;
1143         struct spider_net_hw_descr *hwdescr = descr->hwdescr;
1144         u32 hw_buf_addr;
1145         int status;
1146 
1147         status = spider_net_get_descr_status(hwdescr);
1148 
1149         /* Nothing in the descriptor, or ring must be empty */
1150         if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
1151             (status == SPIDER_NET_DESCR_NOT_IN_USE))
1152                 return 0;
1153 
1154         /* descriptor definitively used -- move on tail */
1155         chain->tail = descr->next;
1156 
1157         /* unmap descriptor */
1158         hw_buf_addr = hwdescr->buf_addr;
1159         hwdescr->buf_addr = 0xffffffff;
1160         pci_unmap_single(card->pdev, hw_buf_addr,
1161                         SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
1162 
1163         if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
1164              (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
1165              (status == SPIDER_NET_DESCR_FORCE_END) ) {
1166                 if (netif_msg_rx_err(card))
1167                         dev_err(&dev->dev,
1168                                "dropping RX descriptor with state %d\n", status);
1169                 dev->stats.rx_dropped++;
1170                 goto bad_desc;
1171         }
1172 
1173         if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
1174              (status != SPIDER_NET_DESCR_FRAME_END) ) {
1175                 if (netif_msg_rx_err(card))
1176                         dev_err(&card->netdev->dev,
1177                                "RX descriptor with unknown state %d\n", status);
1178                 card->spider_stats.rx_desc_unk_state++;
1179                 goto bad_desc;
1180         }
1181 
1182         /* The cases we'll throw away the packet immediately */
1183         if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
1184                 if (netif_msg_rx_err(card))
1185                         dev_err(&card->netdev->dev,
1186                                "error in received descriptor found, "
1187                                "data_status=x%08x, data_error=x%08x\n",
1188                                hwdescr->data_status, hwdescr->data_error);
1189                 goto bad_desc;
1190         }
1191 
1192         if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) {
1193                 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
1194                                hwdescr->dmac_cmd_status);
1195                 pr_err("buf_addr=x%08x\n", hw_buf_addr);
1196                 pr_err("buf_size=x%08x\n", hwdescr->buf_size);
1197                 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
1198                 pr_err("result_size=x%08x\n", hwdescr->result_size);
1199                 pr_err("valid_size=x%08x\n", hwdescr->valid_size);
1200                 pr_err("data_status=x%08x\n", hwdescr->data_status);
1201                 pr_err("data_error=x%08x\n", hwdescr->data_error);
1202                 pr_err("which=%ld\n", descr - card->rx_chain.ring);
1203 
1204                 card->spider_stats.rx_desc_error++;
1205                 goto bad_desc;
1206         }
1207 
1208         /* Ok, we've got a packet in descr */
1209         spider_net_pass_skb_up(descr, card);
1210         descr->skb = NULL;
1211         hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1212         return 1;
1213 
1214 bad_desc:
1215         if (netif_msg_rx_err(card))
1216                 show_rx_chain(card);
1217         dev_kfree_skb_irq(descr->skb);
1218         descr->skb = NULL;
1219         hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1220         return 0;
1221 }
1222 
1223 /**
1224  * spider_net_poll - NAPI poll function called by the stack to return packets
1225  * @netdev: interface device structure
1226  * @budget: number of packets we can pass to the stack at most
1227  *
1228  * returns 0 if no more packets available to the driver/stack. Returns 1,
1229  * if the quota is exceeded, but the driver has still packets.
1230  *
1231  * spider_net_poll returns all packets from the rx descriptors to the stack
1232  * (using netif_receive_skb). If all/enough packets are up, the driver
1233  * reenables interrupts and returns 0. If not, 1 is returned.
1234  */
1235 static int spider_net_poll(struct napi_struct *napi, int budget)
1236 {
1237         struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
1238         int packets_done = 0;
1239 
1240         while (packets_done < budget) {
1241                 if (!spider_net_decode_one_descr(card))
1242                         break;
1243 
1244                 packets_done++;
1245         }
1246 
1247         if ((packets_done == 0) && (card->num_rx_ints != 0)) {
1248                 if (!spider_net_resync_tail_ptr(card))
1249                         packets_done = budget;
1250                 spider_net_resync_head_ptr(card);
1251         }
1252         card->num_rx_ints = 0;
1253 
1254         spider_net_refill_rx_chain(card);
1255         spider_net_enable_rxdmac(card);
1256 
1257         spider_net_cleanup_tx_ring(&card->tx_timer);
1258 
1259         /* if all packets are in the stack, enable interrupts and return 0 */
1260         /* if not, return 1 */
1261         if (packets_done < budget) {
1262                 napi_complete_done(napi, packets_done);
1263                 spider_net_rx_irq_on(card);
1264                 card->ignore_rx_ramfull = 0;
1265         }
1266 
1267         return packets_done;
1268 }
1269 
1270 /**
1271  * spider_net_set_mac - sets the MAC of an interface
1272  * @netdev: interface device structure
1273  * @ptr: pointer to new MAC address
1274  *
1275  * Returns 0 on success, <0 on failure. Currently, we don't support this
1276  * and will always return EOPNOTSUPP.
1277  */
1278 static int
1279 spider_net_set_mac(struct net_device *netdev, void *p)
1280 {
1281         struct spider_net_card *card = netdev_priv(netdev);
1282         u32 macl, macu, regvalue;
1283         struct sockaddr *addr = p;
1284 
1285         if (!is_valid_ether_addr(addr->sa_data))
1286                 return -EADDRNOTAVAIL;
1287 
1288         memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN);
1289 
1290         /* switch off GMACTPE and GMACRPE */
1291         regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1292         regvalue &= ~((1 << 5) | (1 << 6));
1293         spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1294 
1295         /* write mac */
1296         macu = (netdev->dev_addr[0]<<24) + (netdev->dev_addr[1]<<16) +
1297                 (netdev->dev_addr[2]<<8) + (netdev->dev_addr[3]);
1298         macl = (netdev->dev_addr[4]<<8) + (netdev->dev_addr[5]);
1299         spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
1300         spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
1301 
1302         /* switch GMACTPE and GMACRPE back on */
1303         regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1304         regvalue |= ((1 << 5) | (1 << 6));
1305         spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1306 
1307         spider_net_set_promisc(card);
1308 
1309         return 0;
1310 }
1311 
1312 /**
1313  * spider_net_link_reset
1314  * @netdev: net device structure
1315  *
1316  * This is called when the PHY_LINK signal is asserted. For the blade this is
1317  * not connected so we should never get here.
1318  *
1319  */
1320 static void
1321 spider_net_link_reset(struct net_device *netdev)
1322 {
1323 
1324         struct spider_net_card *card = netdev_priv(netdev);
1325 
1326         del_timer_sync(&card->aneg_timer);
1327 
1328         /* clear interrupt, block further interrupts */
1329         spider_net_write_reg(card, SPIDER_NET_GMACST,
1330                              spider_net_read_reg(card, SPIDER_NET_GMACST));
1331         spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1332 
1333         /* reset phy and setup aneg */
1334         card->aneg_count = 0;
1335         card->medium = BCM54XX_COPPER;
1336         spider_net_setup_aneg(card);
1337         mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1338 
1339 }
1340 
1341 /**
1342  * spider_net_handle_error_irq - handles errors raised by an interrupt
1343  * @card: card structure
1344  * @status_reg: interrupt status register 0 (GHIINT0STS)
1345  *
1346  * spider_net_handle_error_irq treats or ignores all error conditions
1347  * found when an interrupt is presented
1348  */
1349 static void
1350 spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
1351                             u32 error_reg1, u32 error_reg2)
1352 {
1353         u32 i;
1354         int show_error = 1;
1355 
1356         /* check GHIINT0STS ************************************/
1357         if (status_reg)
1358                 for (i = 0; i < 32; i++)
1359                         if (status_reg & (1<<i))
1360                                 switch (i)
1361         {
1362         /* let error_reg1 and error_reg2 evaluation decide, what to do
1363         case SPIDER_NET_PHYINT:
1364         case SPIDER_NET_GMAC2INT:
1365         case SPIDER_NET_GMAC1INT:
1366         case SPIDER_NET_GFIFOINT:
1367         case SPIDER_NET_DMACINT:
1368         case SPIDER_NET_GSYSINT:
1369                 break; */
1370 
1371         case SPIDER_NET_GIPSINT:
1372                 show_error = 0;
1373                 break;
1374 
1375         case SPIDER_NET_GPWOPCMPINT:
1376                 /* PHY write operation completed */
1377                 show_error = 0;
1378                 break;
1379         case SPIDER_NET_GPROPCMPINT:
1380                 /* PHY read operation completed */
1381                 /* we don't use semaphores, as we poll for the completion
1382                  * of the read operation in spider_net_read_phy. Should take
1383                  * about 50 us */
1384                 show_error = 0;
1385                 break;
1386         case SPIDER_NET_GPWFFINT:
1387                 /* PHY command queue full */
1388                 if (netif_msg_intr(card))
1389                         dev_err(&card->netdev->dev, "PHY write queue full\n");
1390                 show_error = 0;
1391                 break;
1392 
1393         /* case SPIDER_NET_GRMDADRINT: not used. print a message */
1394         /* case SPIDER_NET_GRMARPINT: not used. print a message */
1395         /* case SPIDER_NET_GRMMPINT: not used. print a message */
1396 
1397         case SPIDER_NET_GDTDEN0INT:
1398                 /* someone has set TX_DMA_EN to 0 */
1399                 show_error = 0;
1400                 break;
1401 
1402         case SPIDER_NET_GDDDEN0INT: /* fallthrough */
1403         case SPIDER_NET_GDCDEN0INT: /* fallthrough */
1404         case SPIDER_NET_GDBDEN0INT: /* fallthrough */
1405         case SPIDER_NET_GDADEN0INT:
1406                 /* someone has set RX_DMA_EN to 0 */
1407                 show_error = 0;
1408                 break;
1409 
1410         /* RX interrupts */
1411         case SPIDER_NET_GDDFDCINT:
1412         case SPIDER_NET_GDCFDCINT:
1413         case SPIDER_NET_GDBFDCINT:
1414         case SPIDER_NET_GDAFDCINT:
1415         /* case SPIDER_NET_GDNMINT: not used. print a message */
1416         /* case SPIDER_NET_GCNMINT: not used. print a message */
1417         /* case SPIDER_NET_GBNMINT: not used. print a message */
1418         /* case SPIDER_NET_GANMINT: not used. print a message */
1419         /* case SPIDER_NET_GRFNMINT: not used. print a message */
1420                 show_error = 0;
1421                 break;
1422 
1423         /* TX interrupts */
1424         case SPIDER_NET_GDTFDCINT:
1425                 show_error = 0;
1426                 break;
1427         case SPIDER_NET_GTTEDINT:
1428                 show_error = 0;
1429                 break;
1430         case SPIDER_NET_GDTDCEINT:
1431                 /* chain end. If a descriptor should be sent, kick off
1432                  * tx dma
1433                 if (card->tx_chain.tail != card->tx_chain.head)
1434                         spider_net_kick_tx_dma(card);
1435                 */
1436                 show_error = 0;
1437                 break;
1438 
1439         /* case SPIDER_NET_G1TMCNTINT: not used. print a message */
1440         /* case SPIDER_NET_GFREECNTINT: not used. print a message */
1441         }
1442 
1443         /* check GHIINT1STS ************************************/
1444         if (error_reg1)
1445                 for (i = 0; i < 32; i++)
1446                         if (error_reg1 & (1<<i))
1447                                 switch (i)
1448         {
1449         case SPIDER_NET_GTMFLLINT:
1450                 /* TX RAM full may happen on a usual case.
1451                  * Logging is not needed. */
1452                 show_error = 0;
1453                 break;
1454         case SPIDER_NET_GRFDFLLINT: /* fallthrough */
1455         case SPIDER_NET_GRFCFLLINT: /* fallthrough */
1456         case SPIDER_NET_GRFBFLLINT: /* fallthrough */
1457         case SPIDER_NET_GRFAFLLINT: /* fallthrough */
1458         case SPIDER_NET_GRMFLLINT:
1459                 /* Could happen when rx chain is full */
1460                 if (card->ignore_rx_ramfull == 0) {
1461                         card->ignore_rx_ramfull = 1;
1462                         spider_net_resync_head_ptr(card);
1463                         spider_net_refill_rx_chain(card);
1464                         spider_net_enable_rxdmac(card);
1465                         card->num_rx_ints ++;
1466                         napi_schedule(&card->napi);
1467                 }
1468                 show_error = 0;
1469                 break;
1470 
1471         /* case SPIDER_NET_GTMSHTINT: problem, print a message */
1472         case SPIDER_NET_GDTINVDINT:
1473                 /* allrighty. tx from previous descr ok */
1474                 show_error = 0;
1475                 break;
1476 
1477         /* chain end */
1478         case SPIDER_NET_GDDDCEINT: /* fallthrough */
1479         case SPIDER_NET_GDCDCEINT: /* fallthrough */
1480         case SPIDER_NET_GDBDCEINT: /* fallthrough */
1481         case SPIDER_NET_GDADCEINT:
1482                 spider_net_resync_head_ptr(card);
1483                 spider_net_refill_rx_chain(card);
1484                 spider_net_enable_rxdmac(card);
1485                 card->num_rx_ints ++;
1486                 napi_schedule(&card->napi);
1487                 show_error = 0;
1488                 break;
1489 
1490         /* invalid descriptor */
1491         case SPIDER_NET_GDDINVDINT: /* fallthrough */
1492         case SPIDER_NET_GDCINVDINT: /* fallthrough */
1493         case SPIDER_NET_GDBINVDINT: /* fallthrough */
1494         case SPIDER_NET_GDAINVDINT:
1495                 /* Could happen when rx chain is full */
1496                 spider_net_resync_head_ptr(card);
1497                 spider_net_refill_rx_chain(card);
1498                 spider_net_enable_rxdmac(card);
1499                 card->num_rx_ints ++;
1500                 napi_schedule(&card->napi);
1501                 show_error = 0;
1502                 break;
1503 
1504         /* case SPIDER_NET_GDTRSERINT: problem, print a message */
1505         /* case SPIDER_NET_GDDRSERINT: problem, print a message */
1506         /* case SPIDER_NET_GDCRSERINT: problem, print a message */
1507         /* case SPIDER_NET_GDBRSERINT: problem, print a message */
1508         /* case SPIDER_NET_GDARSERINT: problem, print a message */
1509         /* case SPIDER_NET_GDSERINT: problem, print a message */
1510         /* case SPIDER_NET_GDTPTERINT: problem, print a message */
1511         /* case SPIDER_NET_GDDPTERINT: problem, print a message */
1512         /* case SPIDER_NET_GDCPTERINT: problem, print a message */
1513         /* case SPIDER_NET_GDBPTERINT: problem, print a message */
1514         /* case SPIDER_NET_GDAPTERINT: problem, print a message */
1515         default:
1516                 show_error = 1;
1517                 break;
1518         }
1519 
1520         /* check GHIINT2STS ************************************/
1521         if (error_reg2)
1522                 for (i = 0; i < 32; i++)
1523                         if (error_reg2 & (1<<i))
1524                                 switch (i)
1525         {
1526         /* there is nothing we can (want  to) do at this time. Log a
1527          * message, we can switch on and off the specific values later on
1528         case SPIDER_NET_GPROPERINT:
1529         case SPIDER_NET_GMCTCRSNGINT:
1530         case SPIDER_NET_GMCTLCOLINT:
1531         case SPIDER_NET_GMCTTMOTINT:
1532         case SPIDER_NET_GMCRCAERINT:
1533         case SPIDER_NET_GMCRCALERINT:
1534         case SPIDER_NET_GMCRALNERINT:
1535         case SPIDER_NET_GMCROVRINT:
1536         case SPIDER_NET_GMCRRNTINT:
1537         case SPIDER_NET_GMCRRXERINT:
1538         case SPIDER_NET_GTITCSERINT:
1539         case SPIDER_NET_GTIFMTERINT:
1540         case SPIDER_NET_GTIPKTRVKINT:
1541         case SPIDER_NET_GTISPINGINT:
1542         case SPIDER_NET_GTISADNGINT:
1543         case SPIDER_NET_GTISPDNGINT:
1544         case SPIDER_NET_GRIFMTERINT:
1545         case SPIDER_NET_GRIPKTRVKINT:
1546         case SPIDER_NET_GRISPINGINT:
1547         case SPIDER_NET_GRISADNGINT:
1548         case SPIDER_NET_GRISPDNGINT:
1549                 break;
1550         */
1551                 default:
1552                         break;
1553         }
1554 
1555         if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
1556                 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, "
1557                        "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
1558                        status_reg, error_reg1, error_reg2);
1559 
1560         /* clear interrupt sources */
1561         spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
1562         spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
1563 }
1564 
1565 /**
1566  * spider_net_interrupt - interrupt handler for spider_net
1567  * @irq: interrupt number
1568  * @ptr: pointer to net_device
1569  *
1570  * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
1571  * interrupt found raised by card.
1572  *
1573  * This is the interrupt handler, that turns off
1574  * interrupts for this device and makes the stack poll the driver
1575  */
1576 static irqreturn_t
1577 spider_net_interrupt(int irq, void *ptr)
1578 {
1579         struct net_device *netdev = ptr;
1580         struct spider_net_card *card = netdev_priv(netdev);
1581         u32 status_reg, error_reg1, error_reg2;
1582 
1583         status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
1584         error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
1585         error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
1586 
1587         if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
1588             !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
1589             !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
1590                 return IRQ_NONE;
1591 
1592         if (status_reg & SPIDER_NET_RXINT ) {
1593                 spider_net_rx_irq_off(card);
1594                 napi_schedule(&card->napi);
1595                 card->num_rx_ints ++;
1596         }
1597         if (status_reg & SPIDER_NET_TXINT)
1598                 napi_schedule(&card->napi);
1599 
1600         if (status_reg & SPIDER_NET_LINKINT)
1601                 spider_net_link_reset(netdev);
1602 
1603         if (status_reg & SPIDER_NET_ERRINT )
1604                 spider_net_handle_error_irq(card, status_reg,
1605                                             error_reg1, error_reg2);
1606 
1607         /* clear interrupt sources */
1608         spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
1609 
1610         return IRQ_HANDLED;
1611 }
1612 
1613 #ifdef CONFIG_NET_POLL_CONTROLLER
1614 /**
1615  * spider_net_poll_controller - artificial interrupt for netconsole etc.
1616  * @netdev: interface device structure
1617  *
1618  * see Documentation/networking/netconsole.txt
1619  */
1620 static void
1621 spider_net_poll_controller(struct net_device *netdev)
1622 {
1623         disable_irq(netdev->irq);
1624         spider_net_interrupt(netdev->irq, netdev);
1625         enable_irq(netdev->irq);
1626 }
1627 #endif /* CONFIG_NET_POLL_CONTROLLER */
1628 
1629 /**
1630  * spider_net_enable_interrupts - enable interrupts
1631  * @card: card structure
1632  *
1633  * spider_net_enable_interrupt enables several interrupts
1634  */
1635 static void
1636 spider_net_enable_interrupts(struct spider_net_card *card)
1637 {
1638         spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
1639                              SPIDER_NET_INT0_MASK_VALUE);
1640         spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
1641                              SPIDER_NET_INT1_MASK_VALUE);
1642         spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
1643                              SPIDER_NET_INT2_MASK_VALUE);
1644 }
1645 
1646 /**
1647  * spider_net_disable_interrupts - disable interrupts
1648  * @card: card structure
1649  *
1650  * spider_net_disable_interrupts disables all the interrupts
1651  */
1652 static void
1653 spider_net_disable_interrupts(struct spider_net_card *card)
1654 {
1655         spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
1656         spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
1657         spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
1658         spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1659 }
1660 
1661 /**
1662  * spider_net_init_card - initializes the card
1663  * @card: card structure
1664  *
1665  * spider_net_init_card initializes the card so that other registers can
1666  * be used
1667  */
1668 static void
1669 spider_net_init_card(struct spider_net_card *card)
1670 {
1671         spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1672                              SPIDER_NET_CKRCTRL_STOP_VALUE);
1673 
1674         spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1675                              SPIDER_NET_CKRCTRL_RUN_VALUE);
1676 
1677         /* trigger ETOMOD signal */
1678         spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1679                 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
1680 
1681         spider_net_disable_interrupts(card);
1682 }
1683 
1684 /**
1685  * spider_net_enable_card - enables the card by setting all kinds of regs
1686  * @card: card structure
1687  *
1688  * spider_net_enable_card sets a lot of SMMIO registers to enable the device
1689  */
1690 static void
1691 spider_net_enable_card(struct spider_net_card *card)
1692 {
1693         int i;
1694         /* the following array consists of (register),(value) pairs
1695          * that are set in this function. A register of 0 ends the list */
1696         u32 regs[][2] = {
1697                 { SPIDER_NET_GRESUMINTNUM, 0 },
1698                 { SPIDER_NET_GREINTNUM, 0 },
1699 
1700                 /* set interrupt frame number registers */
1701                 /* clear the single DMA engine registers first */
1702                 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1703                 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1704                 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1705                 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1706                 /* then set, what we really need */
1707                 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
1708 
1709                 /* timer counter registers and stuff */
1710                 { SPIDER_NET_GFREECNNUM, 0 },
1711                 { SPIDER_NET_GONETIMENUM, 0 },
1712                 { SPIDER_NET_GTOUTFRMNUM, 0 },
1713 
1714                 /* RX mode setting */
1715                 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
1716                 /* TX mode setting */
1717                 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
1718                 /* IPSEC mode setting */
1719                 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
1720 
1721                 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
1722 
1723                 { SPIDER_NET_GMRWOLCTRL, 0 },
1724                 { SPIDER_NET_GTESTMD, 0x10000000 },
1725                 { SPIDER_NET_GTTQMSK, 0x00400040 },
1726 
1727                 { SPIDER_NET_GMACINTEN, 0 },
1728 
1729                 /* flow control stuff */
1730                 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
1731                 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
1732 
1733                 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
1734                 { 0, 0}
1735         };
1736 
1737         i = 0;
1738         while (regs[i][0]) {
1739                 spider_net_write_reg(card, regs[i][0], regs[i][1]);
1740                 i++;
1741         }
1742 
1743         /* clear unicast filter table entries 1 to 14 */
1744         for (i = 1; i <= 14; i++) {
1745                 spider_net_write_reg(card,
1746                                      SPIDER_NET_GMRUAFILnR + i * 8,
1747                                      0x00080000);
1748                 spider_net_write_reg(card,
1749                                      SPIDER_NET_GMRUAFILnR + i * 8 + 4,
1750                                      0x00000000);
1751         }
1752 
1753         spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
1754 
1755         spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
1756 
1757         /* set chain tail address for RX chains and
1758          * enable DMA */
1759         spider_net_enable_rxchtails(card);
1760         spider_net_enable_rxdmac(card);
1761 
1762         spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
1763 
1764         spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
1765                              SPIDER_NET_LENLMT_VALUE);
1766         spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1767                              SPIDER_NET_OPMODE_VALUE);
1768 
1769         spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
1770                              SPIDER_NET_GDTBSTA);
1771 }
1772 
1773 /**
1774  * spider_net_download_firmware - loads firmware into the adapter
1775  * @card: card structure
1776  * @firmware_ptr: pointer to firmware data
1777  *
1778  * spider_net_download_firmware loads the firmware data into the
1779  * adapter. It assumes the length etc. to be allright.
1780  */
1781 static int
1782 spider_net_download_firmware(struct spider_net_card *card,
1783                              const void *firmware_ptr)
1784 {
1785         int sequencer, i;
1786         const u32 *fw_ptr = firmware_ptr;
1787 
1788         /* stop sequencers */
1789         spider_net_write_reg(card, SPIDER_NET_GSINIT,
1790                              SPIDER_NET_STOP_SEQ_VALUE);
1791 
1792         for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
1793              sequencer++) {
1794                 spider_net_write_reg(card,
1795                                      SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
1796                 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
1797                         spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
1798                                              sequencer * 8, *fw_ptr);
1799                         fw_ptr++;
1800                 }
1801         }
1802 
1803         if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
1804                 return -EIO;
1805 
1806         spider_net_write_reg(card, SPIDER_NET_GSINIT,
1807                              SPIDER_NET_RUN_SEQ_VALUE);
1808 
1809         return 0;
1810 }
1811 
1812 /**
1813  * spider_net_init_firmware - reads in firmware parts
1814  * @card: card structure
1815  *
1816  * Returns 0 on success, <0 on failure
1817  *
1818  * spider_net_init_firmware opens the sequencer firmware and does some basic
1819  * checks. This function opens and releases the firmware structure. A call
1820  * to download the firmware is performed before the release.
1821  *
1822  * Firmware format
1823  * ===============
1824  * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
1825  * the program for each sequencer. Use the command
1826  *    tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt              \
1827  *         Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt   \
1828  *         Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
1829  *
1830  * to generate spider_fw.bin, if you have sequencer programs with something
1831  * like the following contents for each sequencer:
1832  *    <ONE LINE COMMENT>
1833  *    <FIRST 4-BYTES-WORD FOR SEQUENCER>
1834  *    <SECOND 4-BYTES-WORD FOR SEQUENCER>
1835  *     ...
1836  *    <1024th 4-BYTES-WORD FOR SEQUENCER>
1837  */
1838 static int
1839 spider_net_init_firmware(struct spider_net_card *card)
1840 {
1841         struct firmware *firmware = NULL;
1842         struct device_node *dn;
1843         const u8 *fw_prop = NULL;
1844         int err = -ENOENT;
1845         int fw_size;
1846 
1847         if (request_firmware((const struct firmware **)&firmware,
1848                              SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
1849                 if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
1850                      netif_msg_probe(card) ) {
1851                         dev_err(&card->netdev->dev,
1852                                "Incorrect size of spidernet firmware in " \
1853                                "filesystem. Looking in host firmware...\n");
1854                         goto try_host_fw;
1855                 }
1856                 err = spider_net_download_firmware(card, firmware->data);
1857 
1858                 release_firmware(firmware);
1859                 if (err)
1860                         goto try_host_fw;
1861 
1862                 goto done;
1863         }
1864 
1865 try_host_fw:
1866         dn = pci_device_to_OF_node(card->pdev);
1867         if (!dn)
1868                 goto out_err;
1869 
1870         fw_prop = of_get_property(dn, "firmware", &fw_size);
1871         if (!fw_prop)
1872                 goto out_err;
1873 
1874         if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
1875              netif_msg_probe(card) ) {
1876                 dev_err(&card->netdev->dev,
1877                        "Incorrect size of spidernet firmware in host firmware\n");
1878                 goto done;
1879         }
1880 
1881         err = spider_net_download_firmware(card, fw_prop);
1882 
1883 done:
1884         return err;
1885 out_err:
1886         if (netif_msg_probe(card))
1887                 dev_err(&card->netdev->dev,
1888                        "Couldn't find spidernet firmware in filesystem " \
1889                        "or host firmware\n");
1890         return err;
1891 }
1892 
1893 /**
1894  * spider_net_open - called upon ifonfig up
1895  * @netdev: interface device structure
1896  *
1897  * returns 0 on success, <0 on failure
1898  *
1899  * spider_net_open allocates all the descriptors and memory needed for
1900  * operation, sets up multicast list and enables interrupts
1901  */
1902 int
1903 spider_net_open(struct net_device *netdev)
1904 {
1905         struct spider_net_card *card = netdev_priv(netdev);
1906         int result;
1907 
1908         result = spider_net_init_firmware(card);
1909         if (result)
1910                 goto init_firmware_failed;
1911 
1912         /* start probing with copper */
1913         card->aneg_count = 0;
1914         card->medium = BCM54XX_COPPER;
1915         spider_net_setup_aneg(card);
1916         if (card->phy.def->phy_id)
1917                 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1918 
1919         result = spider_net_init_chain(card, &card->tx_chain);
1920         if (result)
1921                 goto alloc_tx_failed;
1922         card->low_watermark = NULL;
1923 
1924         result = spider_net_init_chain(card, &card->rx_chain);
1925         if (result)
1926                 goto alloc_rx_failed;
1927 
1928         /* Allocate rx skbs */
1929         result = spider_net_alloc_rx_skbs(card);
1930         if (result)
1931                 goto alloc_skbs_failed;
1932 
1933         spider_net_set_multi(netdev);
1934 
1935         /* further enhancement: setup hw vlan, if needed */
1936 
1937         result = -EBUSY;
1938         if (request_irq(netdev->irq, spider_net_interrupt,
1939                              IRQF_SHARED, netdev->name, netdev))
1940                 goto register_int_failed;
1941 
1942         spider_net_enable_card(card);
1943 
1944         netif_start_queue(netdev);
1945         netif_carrier_on(netdev);
1946         napi_enable(&card->napi);
1947 
1948         spider_net_enable_interrupts(card);
1949 
1950         return 0;
1951 
1952 register_int_failed:
1953         spider_net_free_rx_chain_contents(card);
1954 alloc_skbs_failed:
1955         spider_net_free_chain(card, &card->rx_chain);
1956 alloc_rx_failed:
1957         spider_net_free_chain(card, &card->tx_chain);
1958 alloc_tx_failed:
1959         del_timer_sync(&card->aneg_timer);
1960 init_firmware_failed:
1961         return result;
1962 }
1963 
1964 /**
1965  * spider_net_link_phy
1966  * @data: used for pointer to card structure
1967  *
1968  */
1969 static void spider_net_link_phy(struct timer_list *t)
1970 {
1971         struct spider_net_card *card = from_timer(card, t, aneg_timer);
1972         struct mii_phy *phy = &card->phy;
1973 
1974         /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
1975         if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {
1976 
1977                 pr_debug("%s: link is down trying to bring it up\n",
1978                          card->netdev->name);
1979 
1980                 switch (card->medium) {
1981                 case BCM54XX_COPPER:
1982                         /* enable fiber with autonegotiation first */
1983                         if (phy->def->ops->enable_fiber)
1984                                 phy->def->ops->enable_fiber(phy, 1);
1985                         card->medium = BCM54XX_FIBER;
1986                         break;
1987 
1988                 case BCM54XX_FIBER:
1989                         /* fiber didn't come up, try to disable fiber autoneg */
1990                         if (phy->def->ops->enable_fiber)
1991                                 phy->def->ops->enable_fiber(phy, 0);
1992                         card->medium = BCM54XX_UNKNOWN;
1993                         break;
1994 
1995                 case BCM54XX_UNKNOWN:
1996                         /* copper, fiber with and without failed,
1997                          * retry from beginning */
1998                         spider_net_setup_aneg(card);
1999                         card->medium = BCM54XX_COPPER;
2000                         break;
2001                 }
2002 
2003                 card->aneg_count = 0;
2004                 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2005                 return;
2006         }
2007 
2008         /* link still not up, try again later */
2009         if (!(phy->def->ops->poll_link(phy))) {
2010                 card->aneg_count++;
2011                 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2012                 return;
2013         }
2014 
2015         /* link came up, get abilities */
2016         phy->def->ops->read_link(phy);
2017 
2018         spider_net_write_reg(card, SPIDER_NET_GMACST,
2019                              spider_net_read_reg(card, SPIDER_NET_GMACST));
2020         spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);
2021 
2022         if (phy->speed == 1000)
2023                 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
2024         else
2025                 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);
2026 
2027         card->aneg_count = 0;
2028 
2029         pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n",
2030                 card->netdev->name, phy->speed,
2031                 phy->duplex == 1 ? "Full" : "Half",
2032                 phy->autoneg == 1 ? "" : "no ");
2033 }
2034 
2035 /**
2036  * spider_net_setup_phy - setup PHY
2037  * @card: card structure
2038  *
2039  * returns 0 on success, <0 on failure
2040  *
2041  * spider_net_setup_phy is used as part of spider_net_probe.
2042  **/
2043 static int
2044 spider_net_setup_phy(struct spider_net_card *card)
2045 {
2046         struct mii_phy *phy = &card->phy;
2047 
2048         spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
2049                              SPIDER_NET_DMASEL_VALUE);
2050         spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
2051                              SPIDER_NET_PHY_CTRL_VALUE);
2052 
2053         phy->dev = card->netdev;
2054         phy->mdio_read = spider_net_read_phy;
2055         phy->mdio_write = spider_net_write_phy;
2056 
2057         for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
2058                 unsigned short id;
2059                 id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
2060                 if (id != 0x0000 && id != 0xffff) {
2061                         if (!sungem_phy_probe(phy, phy->mii_id)) {
2062                                 pr_info("Found %s.\n", phy->def->name);
2063                                 break;
2064                         }
2065                 }
2066         }
2067 
2068         return 0;
2069 }
2070 
2071 /**
2072  * spider_net_workaround_rxramfull - work around firmware bug
2073  * @card: card structure
2074  *
2075  * no return value
2076  **/
2077 static void
2078 spider_net_workaround_rxramfull(struct spider_net_card *card)
2079 {
2080         int i, sequencer = 0;
2081 
2082         /* cancel reset */
2083         spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2084                              SPIDER_NET_CKRCTRL_RUN_VALUE);
2085 
2086         /* empty sequencer data */
2087         for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
2088              sequencer++) {
2089                 spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
2090                                      sequencer * 8, 0x0);
2091                 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
2092                         spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
2093                                              sequencer * 8, 0x0);
2094                 }
2095         }
2096 
2097         /* set sequencer operation */
2098         spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
2099 
2100         /* reset */
2101         spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2102                              SPIDER_NET_CKRCTRL_STOP_VALUE);
2103 }
2104 
2105 /**
2106  * spider_net_stop - called upon ifconfig down
2107  * @netdev: interface device structure
2108  *
2109  * always returns 0
2110  */
2111 int
2112 spider_net_stop(struct net_device *netdev)
2113 {
2114         struct spider_net_card *card = netdev_priv(netdev);
2115 
2116         napi_disable(&card->napi);
2117         netif_carrier_off(netdev);
2118         netif_stop_queue(netdev);
2119         del_timer_sync(&card->tx_timer);
2120         del_timer_sync(&card->aneg_timer);
2121 
2122         spider_net_disable_interrupts(card);
2123 
2124         free_irq(netdev->irq, netdev);
2125 
2126         spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
2127                              SPIDER_NET_DMA_TX_FEND_VALUE);
2128 
2129         /* turn off DMA, force end */
2130         spider_net_disable_rxdmac(card);
2131 
2132         /* release chains */
2133         spider_net_release_tx_chain(card, 1);
2134         spider_net_free_rx_chain_contents(card);
2135 
2136         spider_net_free_chain(card, &card->tx_chain);
2137         spider_net_free_chain(card, &card->rx_chain);
2138 
2139         return 0;
2140 }
2141 
2142 /**
2143  * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
2144  * function (to be called not under interrupt status)
2145  * @data: data, is interface device structure
2146  *
2147  * called as task when tx hangs, resets interface (if interface is up)
2148  */
2149 static void
2150 spider_net_tx_timeout_task(struct work_struct *work)
2151 {
2152         struct spider_net_card *card =
2153                 container_of(work, struct spider_net_card, tx_timeout_task);
2154         struct net_device *netdev = card->netdev;
2155 
2156         if (!(netdev->flags & IFF_UP))
2157                 goto out;
2158 
2159         netif_device_detach(netdev);
2160         spider_net_stop(netdev);
2161 
2162         spider_net_workaround_rxramfull(card);
2163         spider_net_init_card(card);
2164 
2165         if (spider_net_setup_phy(card))
2166                 goto out;
2167 
2168         spider_net_open(netdev);
2169         spider_net_kick_tx_dma(card);
2170         netif_device_attach(netdev);
2171 
2172 out:
2173         atomic_dec(&card->tx_timeout_task_counter);
2174 }
2175 
2176 /**
2177  * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
2178  * @netdev: interface device structure
2179  *
2180  * called, if tx hangs. Schedules a task that resets the interface
2181  */
2182 static void
2183 spider_net_tx_timeout(struct net_device *netdev)
2184 {
2185         struct spider_net_card *card;
2186 
2187         card = netdev_priv(netdev);
2188         atomic_inc(&card->tx_timeout_task_counter);
2189         if (netdev->flags & IFF_UP)
2190                 schedule_work(&card->tx_timeout_task);
2191         else
2192                 atomic_dec(&card->tx_timeout_task_counter);
2193         card->spider_stats.tx_timeouts++;
2194 }
2195 
2196 static const struct net_device_ops spider_net_ops = {
2197         .ndo_open               = spider_net_open,
2198         .ndo_stop               = spider_net_stop,
2199         .ndo_start_xmit         = spider_net_xmit,
2200         .ndo_set_rx_mode        = spider_net_set_multi,
2201         .ndo_set_mac_address    = spider_net_set_mac,
2202         .ndo_do_ioctl           = spider_net_do_ioctl,
2203         .ndo_tx_timeout         = spider_net_tx_timeout,
2204         .ndo_validate_addr      = eth_validate_addr,
2205         /* HW VLAN */
2206 #ifdef CONFIG_NET_POLL_CONTROLLER
2207         /* poll controller */
2208         .ndo_poll_controller    = spider_net_poll_controller,
2209 #endif /* CONFIG_NET_POLL_CONTROLLER */
2210 };
2211 
2212 /**
2213  * spider_net_setup_netdev_ops - initialization of net_device operations
2214  * @netdev: net_device structure
2215  *
2216  * fills out function pointers in the net_device structure
2217  */
2218 static void
2219 spider_net_setup_netdev_ops(struct net_device *netdev)
2220 {
2221         netdev->netdev_ops = &spider_net_ops;
2222         netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
2223         /* ethtool ops */
2224         netdev->ethtool_ops = &spider_net_ethtool_ops;
2225 }
2226 
2227 /**
2228  * spider_net_setup_netdev - initialization of net_device
2229  * @card: card structure
2230  *
2231  * Returns 0 on success or <0 on failure
2232  *
2233  * spider_net_setup_netdev initializes the net_device structure
2234  **/
2235 static int
2236 spider_net_setup_netdev(struct spider_net_card *card)
2237 {
2238         int result;
2239         struct net_device *netdev = card->netdev;
2240         struct device_node *dn;
2241         struct sockaddr addr;
2242         const u8 *mac;
2243 
2244         SET_NETDEV_DEV(netdev, &card->pdev->dev);
2245 
2246         pci_set_drvdata(card->pdev, netdev);
2247 
2248         timer_setup(&card->tx_timer, spider_net_cleanup_tx_ring, 0);
2249         netdev->irq = card->pdev->irq;
2250 
2251         card->aneg_count = 0;
2252         timer_setup(&card->aneg_timer, spider_net_link_phy, 0);
2253 
2254         netif_napi_add(netdev, &card->napi,
2255                        spider_net_poll, SPIDER_NET_NAPI_WEIGHT);
2256 
2257         spider_net_setup_netdev_ops(netdev);
2258 
2259         netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
2260         if (SPIDER_NET_RX_CSUM_DEFAULT)
2261                 netdev->features |= NETIF_F_RXCSUM;
2262         netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX;
2263         /* some time: NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
2264          *              NETIF_F_HW_VLAN_CTAG_FILTER */
2265 
2266         /* MTU range: 64 - 2294 */
2267         netdev->min_mtu = SPIDER_NET_MIN_MTU;
2268         netdev->max_mtu = SPIDER_NET_MAX_MTU;
2269 
2270         netdev->irq = card->pdev->irq;
2271         card->num_rx_ints = 0;
2272         card->ignore_rx_ramfull = 0;
2273 
2274         dn = pci_device_to_OF_node(card->pdev);
2275         if (!dn)
2276                 return -EIO;
2277 
2278         mac = of_get_property(dn, "local-mac-address", NULL);
2279         if (!mac)
2280                 return -EIO;
2281         memcpy(addr.sa_data, mac, ETH_ALEN);
2282 
2283         result = spider_net_set_mac(netdev, &addr);
2284         if ((result) && (netif_msg_probe(card)))
2285                 dev_err(&card->netdev->dev,
2286                         "Failed to set MAC address: %i\n", result);
2287 
2288         result = register_netdev(netdev);
2289         if (result) {
2290                 if (netif_msg_probe(card))
2291                         dev_err(&card->netdev->dev,
2292                                 "Couldn't register net_device: %i\n", result);
2293                 return result;
2294         }
2295 
2296         if (netif_msg_probe(card))
2297                 pr_info("Initialized device %s.\n", netdev->name);
2298 
2299         return 0;
2300 }
2301 
2302 /**
2303  * spider_net_alloc_card - allocates net_device and card structure
2304  *
2305  * returns the card structure or NULL in case of errors
2306  *
2307  * the card and net_device structures are linked to each other
2308  */
2309 static struct spider_net_card *
2310 spider_net_alloc_card(void)
2311 {
2312         struct net_device *netdev;
2313         struct spider_net_card *card;
2314 
2315         netdev = alloc_etherdev(struct_size(card, darray,
2316                                             tx_descriptors + rx_descriptors));
2317         if (!netdev)
2318                 return NULL;
2319 
2320         card = netdev_priv(netdev);
2321         card->netdev = netdev;
2322         card->msg_enable = SPIDER_NET_DEFAULT_MSG;
2323         INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
2324         init_waitqueue_head(&card->waitq);
2325         atomic_set(&card->tx_timeout_task_counter, 0);
2326 
2327         card->rx_chain.num_desc = rx_descriptors;
2328         card->rx_chain.ring = card->darray;
2329         card->tx_chain.num_desc = tx_descriptors;
2330         card->tx_chain.ring = card->darray + rx_descriptors;
2331 
2332         return card;
2333 }
2334 
2335 /**
2336  * spider_net_undo_pci_setup - releases PCI ressources
2337  * @card: card structure
2338  *
2339  * spider_net_undo_pci_setup releases the mapped regions
2340  */
2341 static void
2342 spider_net_undo_pci_setup(struct spider_net_card *card)
2343 {
2344         iounmap(card->regs);
2345         pci_release_regions(card->pdev);
2346 }
2347 
2348 /**
2349  * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
2350  * @pdev: PCI device
2351  *
2352  * Returns the card structure or NULL if any errors occur
2353  *
2354  * spider_net_setup_pci_dev initializes pdev and together with the
2355  * functions called in spider_net_open configures the device so that
2356  * data can be transferred over it
2357  * The net_device structure is attached to the card structure, if the
2358  * function returns without error.
2359  **/
2360 static struct spider_net_card *
2361 spider_net_setup_pci_dev(struct pci_dev *pdev)
2362 {
2363         struct spider_net_card *card;
2364         unsigned long mmio_start, mmio_len;
2365 
2366         if (pci_enable_device(pdev)) {
2367                 dev_err(&pdev->dev, "Couldn't enable PCI device\n");
2368                 return NULL;
2369         }
2370 
2371         if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
2372                 dev_err(&pdev->dev,
2373                         "Couldn't find proper PCI device base address.\n");
2374                 goto out_disable_dev;
2375         }
2376 
2377         if (pci_request_regions(pdev, spider_net_driver_name)) {
2378                 dev_err(&pdev->dev,
2379                         "Couldn't obtain PCI resources, aborting.\n");
2380                 goto out_disable_dev;
2381         }
2382 
2383         pci_set_master(pdev);
2384 
2385         card = spider_net_alloc_card();
2386         if (!card) {
2387                 dev_err(&pdev->dev,
2388                         "Couldn't allocate net_device structure, aborting.\n");
2389                 goto out_release_regions;
2390         }
2391         card->pdev = pdev;
2392 
2393         /* fetch base address and length of first resource */
2394         mmio_start = pci_resource_start(pdev, 0);
2395         mmio_len = pci_resource_len(pdev, 0);
2396 
2397         card->netdev->mem_start = mmio_start;
2398         card->netdev->mem_end = mmio_start + mmio_len;
2399         card->regs = ioremap(mmio_start, mmio_len);
2400 
2401         if (!card->regs) {
2402                 dev_err(&pdev->dev,
2403                         "Couldn't obtain PCI resources, aborting.\n");
2404                 goto out_release_regions;
2405         }
2406 
2407         return card;
2408 
2409 out_release_regions:
2410         pci_release_regions(pdev);
2411 out_disable_dev:
2412         pci_disable_device(pdev);
2413         return NULL;
2414 }
2415 
2416 /**
2417  * spider_net_probe - initialization of a device
2418  * @pdev: PCI device
2419  * @ent: entry in the device id list
2420  *
2421  * Returns 0 on success, <0 on failure
2422  *
2423  * spider_net_probe initializes pdev and registers a net_device
2424  * structure for it. After that, the device can be ifconfig'ed up
2425  **/
2426 static int
2427 spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2428 {
2429         int err = -EIO;
2430         struct spider_net_card *card;
2431 
2432         card = spider_net_setup_pci_dev(pdev);
2433         if (!card)
2434                 goto out;
2435 
2436         spider_net_workaround_rxramfull(card);
2437         spider_net_init_card(card);
2438 
2439         err = spider_net_setup_phy(card);
2440         if (err)
2441                 goto out_undo_pci;
2442 
2443         err = spider_net_setup_netdev(card);
2444         if (err)
2445                 goto out_undo_pci;
2446 
2447         return 0;
2448 
2449 out_undo_pci:
2450         spider_net_undo_pci_setup(card);
2451         free_netdev(card->netdev);
2452 out:
2453         return err;
2454 }
2455 
2456 /**
2457  * spider_net_remove - removal of a device
2458  * @pdev: PCI device
2459  *
2460  * Returns 0 on success, <0 on failure
2461  *
2462  * spider_net_remove is called to remove the device and unregisters the
2463  * net_device
2464  **/
2465 static void
2466 spider_net_remove(struct pci_dev *pdev)
2467 {
2468         struct net_device *netdev;
2469         struct spider_net_card *card;
2470 
2471         netdev = pci_get_drvdata(pdev);
2472         card = netdev_priv(netdev);
2473 
2474         wait_event(card->waitq,
2475                    atomic_read(&card->tx_timeout_task_counter) == 0);
2476 
2477         unregister_netdev(netdev);
2478 
2479         /* switch off card */
2480         spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2481                              SPIDER_NET_CKRCTRL_STOP_VALUE);
2482         spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2483                              SPIDER_NET_CKRCTRL_RUN_VALUE);
2484 
2485         spider_net_undo_pci_setup(card);
2486         free_netdev(netdev);
2487 }
2488 
2489 static struct pci_driver spider_net_driver = {
2490         .name           = spider_net_driver_name,
2491         .id_table       = spider_net_pci_tbl,
2492         .probe          = spider_net_probe,
2493         .remove         = spider_net_remove
2494 };
2495 
2496 /**
2497  * spider_net_init - init function when the driver is loaded
2498  *
2499  * spider_net_init registers the device driver
2500  */
2501 static int __init spider_net_init(void)
2502 {
2503         printk(KERN_INFO "Spidernet version %s.\n", VERSION);
2504 
2505         if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
2506                 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
2507                 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2508         }
2509         if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
2510                 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
2511                 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2512         }
2513         if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
2514                 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
2515                 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2516         }
2517         if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
2518                 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
2519                 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2520         }
2521 
2522         return pci_register_driver(&spider_net_driver);
2523 }
2524 
2525 /**
2526  * spider_net_cleanup - exit function when driver is unloaded
2527  *
2528  * spider_net_cleanup unregisters the device driver
2529  */
2530 static void __exit spider_net_cleanup(void)
2531 {
2532         pci_unregister_driver(&spider_net_driver);
2533 }
2534 
2535 module_init(spider_net_init);
2536 module_exit(spider_net_cleanup);