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 */ 151 do { 152 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD); 153 } while (readvalue & SPIDER_NET_GPREXEC); 154 155 readvalue &= SPIDER_NET_GPRDAT_MASK; 156 157 return readvalue; 158 } 159 160 /** 161 * spider_net_setup_aneg - initial auto-negotiation setup 162 * @card: device structure 163 **/ 164 static void 165 spider_net_setup_aneg(struct spider_net_card *card) 166 { 167 struct mii_phy *phy = &card->phy; 168 u32 advertise = 0; 169 u16 bmsr, estat; 170 171 bmsr = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR); 172 estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS); 173 174 if (bmsr & BMSR_10HALF) 175 advertise |= ADVERTISED_10baseT_Half; 176 if (bmsr & BMSR_10FULL) 177 advertise |= ADVERTISED_10baseT_Full; 178 if (bmsr & BMSR_100HALF) 179 advertise |= ADVERTISED_100baseT_Half; 180 if (bmsr & BMSR_100FULL) 181 advertise |= ADVERTISED_100baseT_Full; 182 183 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL)) 184 advertise |= SUPPORTED_1000baseT_Full; 185 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF)) 186 advertise |= SUPPORTED_1000baseT_Half; 187 188 sungem_phy_probe(phy, phy->mii_id); 189 phy->def->ops->setup_aneg(phy, advertise); 190 191 } 192 193 /** 194 * spider_net_rx_irq_off - switch off rx irq on this spider card 195 * @card: device structure 196 * 197 * switches off rx irq by masking them out in the GHIINTnMSK register 198 */ 199 static void 200 spider_net_rx_irq_off(struct spider_net_card *card) 201 { 202 u32 regvalue; 203 204 regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT); 205 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue); 206 } 207 208 /** 209 * spider_net_rx_irq_on - switch on rx irq on this spider card 210 * @card: device structure 211 * 212 * switches on rx irq by enabling them in the GHIINTnMSK register 213 */ 214 static void 215 spider_net_rx_irq_on(struct spider_net_card *card) 216 { 217 u32 regvalue; 218 219 regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT; 220 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue); 221 } 222 223 /** 224 * spider_net_set_promisc - sets the unicast address or the promiscuous mode 225 * @card: card structure 226 * 227 * spider_net_set_promisc sets the unicast destination address filter and 228 * thus either allows for non-promisc mode or promisc mode 229 */ 230 static void 231 spider_net_set_promisc(struct spider_net_card *card) 232 { 233 u32 macu, macl; 234 struct net_device *netdev = card->netdev; 235 236 if (netdev->flags & IFF_PROMISC) { 237 /* clear destination entry 0 */ 238 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0); 239 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0); 240 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 241 SPIDER_NET_PROMISC_VALUE); 242 } else { 243 macu = netdev->dev_addr[0]; 244 macu <<= 8; 245 macu |= netdev->dev_addr[1]; 246 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl)); 247 248 macu |= SPIDER_NET_UA_DESCR_VALUE; 249 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu); 250 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl); 251 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 252 SPIDER_NET_NONPROMISC_VALUE); 253 } 254 } 255 256 /** 257 * spider_net_get_descr_status -- returns the status of a descriptor 258 * @hwdescr: descriptor to look at 259 * 260 * returns the status as in the dmac_cmd_status field of the descriptor 261 */ 262 static inline int 263 spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr) 264 { 265 return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK; 266 } 267 268 /** 269 * spider_net_free_chain - free descriptor chain 270 * @card: card structure 271 * @chain: address of chain 272 * 273 */ 274 static void 275 spider_net_free_chain(struct spider_net_card *card, 276 struct spider_net_descr_chain *chain) 277 { 278 struct spider_net_descr *descr; 279 280 descr = chain->ring; 281 do { 282 descr->bus_addr = 0; 283 descr->hwdescr->next_descr_addr = 0; 284 descr = descr->next; 285 } while (descr != chain->ring); 286 287 dma_free_coherent(&card->pdev->dev, chain->num_desc * sizeof(struct spider_net_hw_descr), 288 chain->hwring, chain->dma_addr); 289 } 290 291 /** 292 * spider_net_init_chain - alloc and link descriptor chain 293 * @card: card structure 294 * @chain: address of chain 295 * 296 * We manage a circular list that mirrors the hardware structure, 297 * except that the hardware uses bus addresses. 298 * 299 * Returns 0 on success, <0 on failure 300 */ 301 static int 302 spider_net_init_chain(struct spider_net_card *card, 303 struct spider_net_descr_chain *chain) 304 { 305 int i; 306 struct spider_net_descr *descr; 307 struct spider_net_hw_descr *hwdescr; 308 dma_addr_t buf; 309 size_t alloc_size; 310 311 alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr); 312 313 chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size, 314 &chain->dma_addr, GFP_KERNEL); 315 if (!chain->hwring) 316 return -ENOMEM; 317 318 /* Set up the hardware pointers in each descriptor */ 319 descr = chain->ring; 320 hwdescr = chain->hwring; 321 buf = chain->dma_addr; 322 for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) { 323 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 324 hwdescr->next_descr_addr = 0; 325 326 descr->hwdescr = hwdescr; 327 descr->bus_addr = buf; 328 descr->next = descr + 1; 329 descr->prev = descr - 1; 330 331 buf += sizeof(struct spider_net_hw_descr); 332 } 333 /* do actual circular list */ 334 (descr-1)->next = chain->ring; 335 chain->ring->prev = descr-1; 336 337 spin_lock_init(&chain->lock); 338 chain->head = chain->ring; 339 chain->tail = chain->ring; 340 return 0; 341 } 342 343 /** 344 * spider_net_free_rx_chain_contents - frees descr contents in rx chain 345 * @card: card structure 346 * 347 * returns 0 on success, <0 on failure 348 */ 349 static void 350 spider_net_free_rx_chain_contents(struct spider_net_card *card) 351 { 352 struct spider_net_descr *descr; 353 354 descr = card->rx_chain.head; 355 do { 356 if (descr->skb) { 357 dma_unmap_single(&card->pdev->dev, 358 descr->hwdescr->buf_addr, 359 SPIDER_NET_MAX_FRAME, 360 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 */ 394 /* allocate an skb */ 395 descr->skb = netdev_alloc_skb(card->netdev, 396 bufsize + SPIDER_NET_RXBUF_ALIGN - 1); 397 if (!descr->skb) { 398 if (netif_msg_rx_err(card) && net_ratelimit()) 399 dev_err(&card->netdev->dev, 400 "Not enough memory to allocate rx buffer\n"); 401 card->spider_stats.alloc_rx_skb_error++; 402 return -ENOMEM; 403 } 404 hwdescr->buf_size = bufsize; 405 hwdescr->result_size = 0; 406 hwdescr->valid_size = 0; 407 hwdescr->data_status = 0; 408 hwdescr->data_error = 0; 409 410 offset = ((unsigned long)descr->skb->data) & 411 (SPIDER_NET_RXBUF_ALIGN - 1); 412 if (offset) 413 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset); 414 /* iommu-map the skb */ 415 buf = dma_map_single(&card->pdev->dev, descr->skb->data, 416 SPIDER_NET_MAX_FRAME, DMA_FROM_DEVICE); 417 if (dma_mapping_error(&card->pdev->dev, buf)) { 418 dev_kfree_skb_any(descr->skb); 419 descr->skb = NULL; 420 if (netif_msg_rx_err(card) && net_ratelimit()) 421 dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n"); 422 card->spider_stats.rx_iommu_map_error++; 423 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 424 } else { 425 hwdescr->buf_addr = buf; 426 wmb(); 427 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED | 428 SPIDER_NET_DMAC_NOINTR_COMPLETE; 429 } 430 431 return 0; 432 } 433 434 /** 435 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses 436 * @card: card structure 437 * 438 * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the 439 * chip by writing to the appropriate register. DMA is enabled in 440 * spider_net_enable_rxdmac. 441 */ 442 static inline void 443 spider_net_enable_rxchtails(struct spider_net_card *card) 444 { 445 /* assume chain is aligned correctly */ 446 spider_net_write_reg(card, SPIDER_NET_GDADCHA , 447 card->rx_chain.tail->bus_addr); 448 } 449 450 /** 451 * spider_net_enable_rxdmac - enables a receive DMA controller 452 * @card: card structure 453 * 454 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN 455 * in the GDADMACCNTR register 456 */ 457 static inline void 458 spider_net_enable_rxdmac(struct spider_net_card *card) 459 { 460 wmb(); 461 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR, 462 SPIDER_NET_DMA_RX_VALUE); 463 } 464 465 /** 466 * spider_net_disable_rxdmac - disables the receive DMA controller 467 * @card: card structure 468 * 469 * spider_net_disable_rxdmac terminates processing on the DMA controller 470 * by turing off the DMA controller, with the force-end flag set. 471 */ 472 static inline void 473 spider_net_disable_rxdmac(struct spider_net_card *card) 474 { 475 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR, 476 SPIDER_NET_DMA_RX_FEND_VALUE); 477 } 478 479 /** 480 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains 481 * @card: card structure 482 * 483 * refills descriptors in the rx chain: allocates skbs and iommu-maps them. 484 */ 485 static void 486 spider_net_refill_rx_chain(struct spider_net_card *card) 487 { 488 struct spider_net_descr_chain *chain = &card->rx_chain; 489 unsigned long flags; 490 491 /* one context doing the refill (and a second context seeing that 492 * and omitting it) is ok. If called by NAPI, we'll be called again 493 * as spider_net_decode_one_descr is called several times. If some 494 * interrupt calls us, the NAPI is about to clean up anyway. 495 */ 496 if (!spin_trylock_irqsave(&chain->lock, flags)) 497 return; 498 499 while (spider_net_get_descr_status(chain->head->hwdescr) == 500 SPIDER_NET_DESCR_NOT_IN_USE) { 501 if (spider_net_prepare_rx_descr(card, chain->head)) 502 break; 503 chain->head = chain->head->next; 504 } 505 506 spin_unlock_irqrestore(&chain->lock, flags); 507 } 508 509 /** 510 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains 511 * @card: card structure 512 * 513 * Returns 0 on success, <0 on failure. 514 */ 515 static int 516 spider_net_alloc_rx_skbs(struct spider_net_card *card) 517 { 518 struct spider_net_descr_chain *chain = &card->rx_chain; 519 struct spider_net_descr *start = chain->tail; 520 struct spider_net_descr *descr = start; 521 522 /* Link up the hardware chain pointers */ 523 do { 524 descr->prev->hwdescr->next_descr_addr = descr->bus_addr; 525 descr = descr->next; 526 } while (descr != start); 527 528 /* Put at least one buffer into the chain. if this fails, 529 * we've got a problem. If not, spider_net_refill_rx_chain 530 * will do the rest at the end of this function. 531 */ 532 if (spider_net_prepare_rx_descr(card, chain->head)) 533 goto error; 534 else 535 chain->head = chain->head->next; 536 537 /* This will allocate the rest of the rx buffers; 538 * if not, it's business as usual later on. 539 */ 540 spider_net_refill_rx_chain(card); 541 spider_net_enable_rxdmac(card); 542 return 0; 543 544 error: 545 spider_net_free_rx_chain_contents(card); 546 return -ENOMEM; 547 } 548 549 /** 550 * spider_net_get_multicast_hash - generates hash for multicast filter table 551 * @netdev: interface device structure 552 * @addr: multicast address 553 * 554 * returns the hash value. 555 * 556 * spider_net_get_multicast_hash calculates a hash value for a given multicast 557 * address, that is used to set the multicast filter tables 558 */ 559 static u8 560 spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr) 561 { 562 u32 crc; 563 u8 hash; 564 char addr_for_crc[ETH_ALEN] = { 0, }; 565 int i, bit; 566 567 for (i = 0; i < ETH_ALEN * 8; i++) { 568 bit = (addr[i / 8] >> (i % 8)) & 1; 569 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8)); 570 } 571 572 crc = crc32_be(~0, addr_for_crc, netdev->addr_len); 573 574 hash = (crc >> 27); 575 hash <<= 3; 576 hash |= crc & 7; 577 hash &= 0xff; 578 579 return hash; 580 } 581 582 /** 583 * spider_net_set_multi - sets multicast addresses and promisc flags 584 * @netdev: interface device structure 585 * 586 * spider_net_set_multi configures multicast addresses as needed for the 587 * netdev interface. It also sets up multicast, allmulti and promisc 588 * flags appropriately 589 */ 590 static void 591 spider_net_set_multi(struct net_device *netdev) 592 { 593 struct netdev_hw_addr *ha; 594 u8 hash; 595 int i; 596 u32 reg; 597 struct spider_net_card *card = netdev_priv(netdev); 598 DECLARE_BITMAP(bitmask, SPIDER_NET_MULTICAST_HASHES) = {}; 599 600 spider_net_set_promisc(card); 601 602 if (netdev->flags & IFF_ALLMULTI) { 603 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) { 604 set_bit(i, bitmask); 605 } 606 goto write_hash; 607 } 608 609 /* well, we know, what the broadcast hash value is: it's xfd 610 hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */ 611 set_bit(0xfd, bitmask); 612 613 netdev_for_each_mc_addr(ha, netdev) { 614 hash = spider_net_get_multicast_hash(netdev, ha->addr); 615 set_bit(hash, bitmask); 616 } 617 618 write_hash: 619 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) { 620 reg = 0; 621 if (test_bit(i * 4, bitmask)) 622 reg += 0x08; 623 reg <<= 8; 624 if (test_bit(i * 4 + 1, bitmask)) 625 reg += 0x08; 626 reg <<= 8; 627 if (test_bit(i * 4 + 2, bitmask)) 628 reg += 0x08; 629 reg <<= 8; 630 if (test_bit(i * 4 + 3, bitmask)) 631 reg += 0x08; 632 633 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg); 634 } 635 } 636 637 /** 638 * spider_net_prepare_tx_descr - fill tx descriptor with skb data 639 * @card: card structure 640 * @skb: packet to use 641 * 642 * returns 0 on success, <0 on failure. 643 * 644 * fills out the descriptor structure with skb data and len. Copies data, 645 * if needed (32bit DMA!) 646 */ 647 static int 648 spider_net_prepare_tx_descr(struct spider_net_card *card, 649 struct sk_buff *skb) 650 { 651 struct spider_net_descr_chain *chain = &card->tx_chain; 652 struct spider_net_descr *descr; 653 struct spider_net_hw_descr *hwdescr; 654 dma_addr_t buf; 655 unsigned long flags; 656 657 buf = dma_map_single(&card->pdev->dev, skb->data, skb->len, 658 DMA_TO_DEVICE); 659 if (dma_mapping_error(&card->pdev->dev, buf)) { 660 if (netif_msg_tx_err(card) && net_ratelimit()) 661 dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). " 662 "Dropping packet\n", skb->data, skb->len); 663 card->spider_stats.tx_iommu_map_error++; 664 return -ENOMEM; 665 } 666 667 spin_lock_irqsave(&chain->lock, flags); 668 descr = card->tx_chain.head; 669 if (descr->next == chain->tail->prev) { 670 spin_unlock_irqrestore(&chain->lock, flags); 671 dma_unmap_single(&card->pdev->dev, buf, skb->len, 672 DMA_TO_DEVICE); 673 return -ENOMEM; 674 } 675 hwdescr = descr->hwdescr; 676 chain->head = descr->next; 677 678 descr->skb = skb; 679 hwdescr->buf_addr = buf; 680 hwdescr->buf_size = skb->len; 681 hwdescr->next_descr_addr = 0; 682 hwdescr->data_status = 0; 683 684 hwdescr->dmac_cmd_status = 685 SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL; 686 spin_unlock_irqrestore(&chain->lock, flags); 687 688 if (skb->ip_summed == CHECKSUM_PARTIAL) 689 switch (ip_hdr(skb)->protocol) { 690 case IPPROTO_TCP: 691 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP; 692 break; 693 case IPPROTO_UDP: 694 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP; 695 break; 696 } 697 698 /* Chain the bus address, so that the DMA engine finds this descr. */ 699 wmb(); 700 descr->prev->hwdescr->next_descr_addr = descr->bus_addr; 701 702 netif_trans_update(card->netdev); /* set netdev watchdog timer */ 703 return 0; 704 } 705 706 static int 707 spider_net_set_low_watermark(struct spider_net_card *card) 708 { 709 struct spider_net_descr *descr = card->tx_chain.tail; 710 struct spider_net_hw_descr *hwdescr; 711 unsigned long flags; 712 int status; 713 int cnt=0; 714 int i; 715 716 /* Measure the length of the queue. Measurement does not 717 * need to be precise -- does not need a lock. 718 */ 719 while (descr != card->tx_chain.head) { 720 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE; 721 if (status == SPIDER_NET_DESCR_NOT_IN_USE) 722 break; 723 descr = descr->next; 724 cnt++; 725 } 726 727 /* If TX queue is short, don't even bother with interrupts */ 728 if (cnt < card->tx_chain.num_desc/4) 729 return cnt; 730 731 /* Set low-watermark 3/4th's of the way into the queue. */ 732 descr = card->tx_chain.tail; 733 cnt = (cnt*3)/4; 734 for (i=0;i<cnt; i++) 735 descr = descr->next; 736 737 /* Set the new watermark, clear the old watermark */ 738 spin_lock_irqsave(&card->tx_chain.lock, flags); 739 descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG; 740 if (card->low_watermark && card->low_watermark != descr) { 741 hwdescr = card->low_watermark->hwdescr; 742 hwdescr->dmac_cmd_status = 743 hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG; 744 } 745 card->low_watermark = descr; 746 spin_unlock_irqrestore(&card->tx_chain.lock, flags); 747 return cnt; 748 } 749 750 /** 751 * spider_net_release_tx_chain - processes sent tx descriptors 752 * @card: adapter structure 753 * @brutal: if set, don't care about whether descriptor seems to be in use 754 * 755 * returns 0 if the tx ring is empty, otherwise 1. 756 * 757 * spider_net_release_tx_chain releases the tx descriptors that spider has 758 * finished with (if non-brutal) or simply release tx descriptors (if brutal). 759 * If some other context is calling this function, we return 1 so that we're 760 * scheduled again (if we were scheduled) and will not lose initiative. 761 */ 762 static int 763 spider_net_release_tx_chain(struct spider_net_card *card, int brutal) 764 { 765 struct net_device *dev = card->netdev; 766 struct spider_net_descr_chain *chain = &card->tx_chain; 767 struct spider_net_descr *descr; 768 struct spider_net_hw_descr *hwdescr; 769 struct sk_buff *skb; 770 u32 buf_addr; 771 unsigned long flags; 772 int status; 773 774 while (1) { 775 spin_lock_irqsave(&chain->lock, flags); 776 if (chain->tail == chain->head) { 777 spin_unlock_irqrestore(&chain->lock, flags); 778 return 0; 779 } 780 descr = chain->tail; 781 hwdescr = descr->hwdescr; 782 783 status = spider_net_get_descr_status(hwdescr); 784 switch (status) { 785 case SPIDER_NET_DESCR_COMPLETE: 786 dev->stats.tx_packets++; 787 dev->stats.tx_bytes += descr->skb->len; 788 break; 789 790 case SPIDER_NET_DESCR_CARDOWNED: 791 if (!brutal) { 792 spin_unlock_irqrestore(&chain->lock, flags); 793 return 1; 794 } 795 796 /* fallthrough, if we release the descriptors 797 * brutally (then we don't care about 798 * SPIDER_NET_DESCR_CARDOWNED) 799 */ 800 fallthrough; 801 802 case SPIDER_NET_DESCR_RESPONSE_ERROR: 803 case SPIDER_NET_DESCR_PROTECTION_ERROR: 804 case SPIDER_NET_DESCR_FORCE_END: 805 if (netif_msg_tx_err(card)) 806 dev_err(&card->netdev->dev, "forcing end of tx descriptor " 807 "with status x%02x\n", status); 808 dev->stats.tx_errors++; 809 break; 810 811 default: 812 dev->stats.tx_dropped++; 813 if (!brutal) { 814 spin_unlock_irqrestore(&chain->lock, flags); 815 return 1; 816 } 817 } 818 819 chain->tail = descr->next; 820 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE; 821 skb = descr->skb; 822 descr->skb = NULL; 823 buf_addr = hwdescr->buf_addr; 824 spin_unlock_irqrestore(&chain->lock, flags); 825 826 /* unmap the skb */ 827 if (skb) { 828 dma_unmap_single(&card->pdev->dev, buf_addr, skb->len, 829 DMA_TO_DEVICE); 830 dev_consume_skb_any(skb); 831 } 832 } 833 return 0; 834 } 835 836 /** 837 * spider_net_kick_tx_dma - enables TX DMA processing 838 * @card: card structure 839 * 840 * This routine will start the transmit DMA running if 841 * it is not already running. This routine ned only be 842 * called when queueing a new packet to an empty tx queue. 843 * Writes the current tx chain head as start address 844 * of the tx descriptor chain and enables the transmission 845 * DMA engine. 846 */ 847 static inline void 848 spider_net_kick_tx_dma(struct spider_net_card *card) 849 { 850 struct spider_net_descr *descr; 851 852 if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) & 853 SPIDER_NET_TX_DMA_EN) 854 goto out; 855 856 descr = card->tx_chain.tail; 857 for (;;) { 858 if (spider_net_get_descr_status(descr->hwdescr) == 859 SPIDER_NET_DESCR_CARDOWNED) { 860 spider_net_write_reg(card, SPIDER_NET_GDTDCHA, 861 descr->bus_addr); 862 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, 863 SPIDER_NET_DMA_TX_VALUE); 864 break; 865 } 866 if (descr == card->tx_chain.head) 867 break; 868 descr = descr->next; 869 } 870 871 out: 872 mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER); 873 } 874 875 /** 876 * spider_net_xmit - transmits a frame over the device 877 * @skb: packet to send out 878 * @netdev: interface device structure 879 * 880 * returns NETDEV_TX_OK on success, NETDEV_TX_BUSY on failure 881 */ 882 static netdev_tx_t 883 spider_net_xmit(struct sk_buff *skb, struct net_device *netdev) 884 { 885 int cnt; 886 struct spider_net_card *card = netdev_priv(netdev); 887 888 spider_net_release_tx_chain(card, 0); 889 890 if (spider_net_prepare_tx_descr(card, skb) != 0) { 891 netdev->stats.tx_dropped++; 892 netif_stop_queue(netdev); 893 return NETDEV_TX_BUSY; 894 } 895 896 cnt = spider_net_set_low_watermark(card); 897 if (cnt < 5) 898 spider_net_kick_tx_dma(card); 899 return NETDEV_TX_OK; 900 } 901 902 /** 903 * spider_net_cleanup_tx_ring - cleans up the TX ring 904 * @t: timer context used to obtain the pointer to net card data structure 905 * 906 * spider_net_cleanup_tx_ring is called by either the tx_timer 907 * or from the NAPI polling routine. 908 * This routine releases resources associted with transmitted 909 * packets, including updating the queue tail pointer. 910 */ 911 static void 912 spider_net_cleanup_tx_ring(struct timer_list *t) 913 { 914 struct spider_net_card *card = from_timer(card, t, tx_timer); 915 if ((spider_net_release_tx_chain(card, 0) != 0) && 916 (card->netdev->flags & IFF_UP)) { 917 spider_net_kick_tx_dma(card); 918 netif_wake_queue(card->netdev); 919 } 920 } 921 922 /** 923 * spider_net_do_ioctl - called for device ioctls 924 * @netdev: interface device structure 925 * @ifr: request parameter structure for ioctl 926 * @cmd: command code for ioctl 927 * 928 * returns 0 on success, <0 on failure. Currently, we have no special ioctls. 929 * -EOPNOTSUPP is returned, if an unknown ioctl was requested 930 */ 931 static int 932 spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) 933 { 934 switch (cmd) { 935 default: 936 return -EOPNOTSUPP; 937 } 938 } 939 940 /** 941 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on 942 * @descr: descriptor to process 943 * @card: card structure 944 * 945 * Fills out skb structure and passes the data to the stack. 946 * The descriptor state is not changed. 947 */ 948 static void 949 spider_net_pass_skb_up(struct spider_net_descr *descr, 950 struct spider_net_card *card) 951 { 952 struct spider_net_hw_descr *hwdescr = descr->hwdescr; 953 struct sk_buff *skb = descr->skb; 954 struct net_device *netdev = card->netdev; 955 u32 data_status = hwdescr->data_status; 956 u32 data_error = hwdescr->data_error; 957 958 skb_put(skb, hwdescr->valid_size); 959 960 /* the card seems to add 2 bytes of junk in front 961 * of the ethernet frame 962 */ 963 #define SPIDER_MISALIGN 2 964 skb_pull(skb, SPIDER_MISALIGN); 965 skb->protocol = eth_type_trans(skb, netdev); 966 967 /* checksum offload */ 968 skb_checksum_none_assert(skb); 969 if (netdev->features & NETIF_F_RXCSUM) { 970 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) == 971 SPIDER_NET_DATA_STATUS_CKSUM_MASK) && 972 !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK)) 973 skb->ip_summed = CHECKSUM_UNNECESSARY; 974 } 975 976 if (data_status & SPIDER_NET_VLAN_PACKET) { 977 /* further enhancements: HW-accel VLAN */ 978 } 979 980 /* update netdevice statistics */ 981 netdev->stats.rx_packets++; 982 netdev->stats.rx_bytes += skb->len; 983 984 /* pass skb up to stack */ 985 netif_receive_skb(skb); 986 } 987 988 static void show_rx_chain(struct spider_net_card *card) 989 { 990 struct spider_net_descr_chain *chain = &card->rx_chain; 991 struct spider_net_descr *start= chain->tail; 992 struct spider_net_descr *descr= start; 993 struct spider_net_hw_descr *hwd = start->hwdescr; 994 struct device *dev = &card->netdev->dev; 995 u32 curr_desc, next_desc; 996 int status; 997 998 int tot = 0; 999 int cnt = 0; 1000 int off = start - chain->ring; 1001 int cstat = hwd->dmac_cmd_status; 1002 1003 dev_info(dev, "Total number of descrs=%d\n", 1004 chain->num_desc); 1005 dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n", 1006 off, cstat); 1007 1008 curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA); 1009 next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA); 1010 1011 status = cstat; 1012 do 1013 { 1014 hwd = descr->hwdescr; 1015 off = descr - chain->ring; 1016 status = hwd->dmac_cmd_status; 1017 1018 if (descr == chain->head) 1019 dev_info(dev, "Chain head is at %d, head status=0x%x\n", 1020 off, status); 1021 1022 if (curr_desc == descr->bus_addr) 1023 dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n", 1024 off, status); 1025 1026 if (next_desc == descr->bus_addr) 1027 dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n", 1028 off, status); 1029 1030 if (hwd->next_descr_addr == 0) 1031 dev_info(dev, "chain is cut at %d\n", off); 1032 1033 if (cstat != status) { 1034 int from = (chain->num_desc + off - cnt) % chain->num_desc; 1035 int to = (chain->num_desc + off - 1) % chain->num_desc; 1036 dev_info(dev, "Have %d (from %d to %d) descrs " 1037 "with stat=0x%08x\n", cnt, from, to, cstat); 1038 cstat = status; 1039 cnt = 0; 1040 } 1041 1042 cnt ++; 1043 tot ++; 1044 descr = descr->next; 1045 } while (descr != start); 1046 1047 dev_info(dev, "Last %d descrs with stat=0x%08x " 1048 "for a total of %d descrs\n", cnt, cstat, tot); 1049 1050 #ifdef DEBUG 1051 /* Now dump the whole ring */ 1052 descr = start; 1053 do 1054 { 1055 struct spider_net_hw_descr *hwd = descr->hwdescr; 1056 status = spider_net_get_descr_status(hwd); 1057 cnt = descr - chain->ring; 1058 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n", 1059 cnt, status, descr->skb); 1060 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n", 1061 descr->bus_addr, hwd->buf_addr, hwd->buf_size); 1062 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n", 1063 hwd->next_descr_addr, hwd->result_size, 1064 hwd->valid_size); 1065 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n", 1066 hwd->dmac_cmd_status, hwd->data_status, 1067 hwd->data_error); 1068 dev_info(dev, "\n"); 1069 1070 descr = descr->next; 1071 } while (descr != start); 1072 #endif 1073 1074 } 1075 1076 /** 1077 * spider_net_resync_head_ptr - Advance head ptr past empty descrs 1078 * @card: card structure 1079 * 1080 * If the driver fails to keep up and empty the queue, then the 1081 * hardware wil run out of room to put incoming packets. This 1082 * will cause the hardware to skip descrs that are full (instead 1083 * of halting/retrying). Thus, once the driver runs, it wil need 1084 * to "catch up" to where the hardware chain pointer is at. 1085 */ 1086 static void spider_net_resync_head_ptr(struct spider_net_card *card) 1087 { 1088 unsigned long flags; 1089 struct spider_net_descr_chain *chain = &card->rx_chain; 1090 struct spider_net_descr *descr; 1091 int i, status; 1092 1093 /* Advance head pointer past any empty descrs */ 1094 descr = chain->head; 1095 status = spider_net_get_descr_status(descr->hwdescr); 1096 1097 if (status == SPIDER_NET_DESCR_NOT_IN_USE) 1098 return; 1099 1100 spin_lock_irqsave(&chain->lock, flags); 1101 1102 descr = chain->head; 1103 status = spider_net_get_descr_status(descr->hwdescr); 1104 for (i=0; i<chain->num_desc; i++) { 1105 if (status != SPIDER_NET_DESCR_CARDOWNED) break; 1106 descr = descr->next; 1107 status = spider_net_get_descr_status(descr->hwdescr); 1108 } 1109 chain->head = descr; 1110 1111 spin_unlock_irqrestore(&chain->lock, flags); 1112 } 1113 1114 static int spider_net_resync_tail_ptr(struct spider_net_card *card) 1115 { 1116 struct spider_net_descr_chain *chain = &card->rx_chain; 1117 struct spider_net_descr *descr; 1118 int i, status; 1119 1120 /* Advance tail pointer past any empty and reaped descrs */ 1121 descr = chain->tail; 1122 status = spider_net_get_descr_status(descr->hwdescr); 1123 1124 for (i=0; i<chain->num_desc; i++) { 1125 if ((status != SPIDER_NET_DESCR_CARDOWNED) && 1126 (status != SPIDER_NET_DESCR_NOT_IN_USE)) break; 1127 descr = descr->next; 1128 status = spider_net_get_descr_status(descr->hwdescr); 1129 } 1130 chain->tail = descr; 1131 1132 if ((i == chain->num_desc) || (i == 0)) 1133 return 1; 1134 return 0; 1135 } 1136 1137 /** 1138 * spider_net_decode_one_descr - processes an RX descriptor 1139 * @card: card structure 1140 * 1141 * Returns 1 if a packet has been sent to the stack, otherwise 0. 1142 * 1143 * Processes an RX descriptor by iommu-unmapping the data buffer 1144 * and passing the packet up to the stack. This function is called 1145 * in softirq context, e.g. either bottom half from interrupt or 1146 * NAPI polling context. 1147 */ 1148 static int 1149 spider_net_decode_one_descr(struct spider_net_card *card) 1150 { 1151 struct net_device *dev = card->netdev; 1152 struct spider_net_descr_chain *chain = &card->rx_chain; 1153 struct spider_net_descr *descr = chain->tail; 1154 struct spider_net_hw_descr *hwdescr = descr->hwdescr; 1155 u32 hw_buf_addr; 1156 int status; 1157 1158 status = spider_net_get_descr_status(hwdescr); 1159 1160 /* Nothing in the descriptor, or ring must be empty */ 1161 if ((status == SPIDER_NET_DESCR_CARDOWNED) || 1162 (status == SPIDER_NET_DESCR_NOT_IN_USE)) 1163 return 0; 1164 1165 /* descriptor definitively used -- move on tail */ 1166 chain->tail = descr->next; 1167 1168 /* unmap descriptor */ 1169 hw_buf_addr = hwdescr->buf_addr; 1170 hwdescr->buf_addr = 0xffffffff; 1171 dma_unmap_single(&card->pdev->dev, hw_buf_addr, SPIDER_NET_MAX_FRAME, 1172 DMA_FROM_DEVICE); 1173 1174 if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) || 1175 (status == SPIDER_NET_DESCR_PROTECTION_ERROR) || 1176 (status == SPIDER_NET_DESCR_FORCE_END) ) { 1177 if (netif_msg_rx_err(card)) 1178 dev_err(&dev->dev, 1179 "dropping RX descriptor with state %d\n", status); 1180 dev->stats.rx_dropped++; 1181 goto bad_desc; 1182 } 1183 1184 if ( (status != SPIDER_NET_DESCR_COMPLETE) && 1185 (status != SPIDER_NET_DESCR_FRAME_END) ) { 1186 if (netif_msg_rx_err(card)) 1187 dev_err(&card->netdev->dev, 1188 "RX descriptor with unknown state %d\n", status); 1189 card->spider_stats.rx_desc_unk_state++; 1190 goto bad_desc; 1191 } 1192 1193 /* The cases we'll throw away the packet immediately */ 1194 if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) { 1195 if (netif_msg_rx_err(card)) 1196 dev_err(&card->netdev->dev, 1197 "error in received descriptor found, " 1198 "data_status=x%08x, data_error=x%08x\n", 1199 hwdescr->data_status, hwdescr->data_error); 1200 goto bad_desc; 1201 } 1202 1203 if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) { 1204 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n", 1205 hwdescr->dmac_cmd_status); 1206 pr_err("buf_addr=x%08x\n", hw_buf_addr); 1207 pr_err("buf_size=x%08x\n", hwdescr->buf_size); 1208 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr); 1209 pr_err("result_size=x%08x\n", hwdescr->result_size); 1210 pr_err("valid_size=x%08x\n", hwdescr->valid_size); 1211 pr_err("data_status=x%08x\n", hwdescr->data_status); 1212 pr_err("data_error=x%08x\n", hwdescr->data_error); 1213 pr_err("which=%ld\n", descr - card->rx_chain.ring); 1214 1215 card->spider_stats.rx_desc_error++; 1216 goto bad_desc; 1217 } 1218 1219 /* Ok, we've got a packet in descr */ 1220 spider_net_pass_skb_up(descr, card); 1221 descr->skb = NULL; 1222 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 1223 return 1; 1224 1225 bad_desc: 1226 if (netif_msg_rx_err(card)) 1227 show_rx_chain(card); 1228 dev_kfree_skb_irq(descr->skb); 1229 descr->skb = NULL; 1230 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 1231 return 0; 1232 } 1233 1234 /** 1235 * spider_net_poll - NAPI poll function called by the stack to return packets 1236 * @napi: napi device structure 1237 * @budget: number of packets we can pass to the stack at most 1238 * 1239 * returns 0 if no more packets available to the driver/stack. Returns 1, 1240 * if the quota is exceeded, but the driver has still packets. 1241 * 1242 * spider_net_poll returns all packets from the rx descriptors to the stack 1243 * (using netif_receive_skb). If all/enough packets are up, the driver 1244 * reenables interrupts and returns 0. If not, 1 is returned. 1245 */ 1246 static int spider_net_poll(struct napi_struct *napi, int budget) 1247 { 1248 struct spider_net_card *card = container_of(napi, struct spider_net_card, napi); 1249 int packets_done = 0; 1250 1251 while (packets_done < budget) { 1252 if (!spider_net_decode_one_descr(card)) 1253 break; 1254 1255 packets_done++; 1256 } 1257 1258 if ((packets_done == 0) && (card->num_rx_ints != 0)) { 1259 if (!spider_net_resync_tail_ptr(card)) 1260 packets_done = budget; 1261 spider_net_resync_head_ptr(card); 1262 } 1263 card->num_rx_ints = 0; 1264 1265 spider_net_refill_rx_chain(card); 1266 spider_net_enable_rxdmac(card); 1267 1268 spider_net_cleanup_tx_ring(&card->tx_timer); 1269 1270 /* if all packets are in the stack, enable interrupts and return 0 */ 1271 /* if not, return 1 */ 1272 if (packets_done < budget) { 1273 napi_complete_done(napi, packets_done); 1274 spider_net_rx_irq_on(card); 1275 card->ignore_rx_ramfull = 0; 1276 } 1277 1278 return packets_done; 1279 } 1280 1281 /** 1282 * spider_net_set_mac - sets the MAC of an interface 1283 * @netdev: interface device structure 1284 * @p: pointer to new MAC address 1285 * 1286 * Returns 0 on success, <0 on failure. Currently, we don't support this 1287 * and will always return EOPNOTSUPP. 1288 */ 1289 static int 1290 spider_net_set_mac(struct net_device *netdev, void *p) 1291 { 1292 struct spider_net_card *card = netdev_priv(netdev); 1293 u32 macl, macu, regvalue; 1294 struct sockaddr *addr = p; 1295 1296 if (!is_valid_ether_addr(addr->sa_data)) 1297 return -EADDRNOTAVAIL; 1298 1299 eth_hw_addr_set(netdev, addr->sa_data); 1300 1301 /* switch off GMACTPE and GMACRPE */ 1302 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD); 1303 regvalue &= ~((1 << 5) | (1 << 6)); 1304 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue); 1305 1306 /* write mac */ 1307 macu = (netdev->dev_addr[0]<<24) + (netdev->dev_addr[1]<<16) + 1308 (netdev->dev_addr[2]<<8) + (netdev->dev_addr[3]); 1309 macl = (netdev->dev_addr[4]<<8) + (netdev->dev_addr[5]); 1310 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu); 1311 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl); 1312 1313 /* switch GMACTPE and GMACRPE back on */ 1314 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD); 1315 regvalue |= ((1 << 5) | (1 << 6)); 1316 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue); 1317 1318 spider_net_set_promisc(card); 1319 1320 return 0; 1321 } 1322 1323 /** 1324 * spider_net_link_reset 1325 * @netdev: net device structure 1326 * 1327 * This is called when the PHY_LINK signal is asserted. For the blade this is 1328 * not connected so we should never get here. 1329 * 1330 */ 1331 static void 1332 spider_net_link_reset(struct net_device *netdev) 1333 { 1334 1335 struct spider_net_card *card = netdev_priv(netdev); 1336 1337 del_timer_sync(&card->aneg_timer); 1338 1339 /* clear interrupt, block further interrupts */ 1340 spider_net_write_reg(card, SPIDER_NET_GMACST, 1341 spider_net_read_reg(card, SPIDER_NET_GMACST)); 1342 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0); 1343 1344 /* reset phy and setup aneg */ 1345 card->aneg_count = 0; 1346 card->medium = BCM54XX_COPPER; 1347 spider_net_setup_aneg(card); 1348 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 1349 1350 } 1351 1352 /** 1353 * spider_net_handle_error_irq - handles errors raised by an interrupt 1354 * @card: card structure 1355 * @status_reg: interrupt status register 0 (GHIINT0STS) 1356 * @error_reg1: interrupt status register 1 (GHIINT1STS) 1357 * @error_reg2: interrupt status register 2 (GHIINT2STS) 1358 * 1359 * spider_net_handle_error_irq treats or ignores all error conditions 1360 * found when an interrupt is presented 1361 */ 1362 static void 1363 spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg, 1364 u32 error_reg1, u32 error_reg2) 1365 { 1366 u32 i; 1367 int show_error = 1; 1368 1369 /* check GHIINT0STS ************************************/ 1370 if (status_reg) 1371 for (i = 0; i < 32; i++) 1372 if (status_reg & (1<<i)) 1373 switch (i) 1374 { 1375 /* let error_reg1 and error_reg2 evaluation decide, what to do 1376 case SPIDER_NET_PHYINT: 1377 case SPIDER_NET_GMAC2INT: 1378 case SPIDER_NET_GMAC1INT: 1379 case SPIDER_NET_GFIFOINT: 1380 case SPIDER_NET_DMACINT: 1381 case SPIDER_NET_GSYSINT: 1382 break; */ 1383 1384 case SPIDER_NET_GIPSINT: 1385 show_error = 0; 1386 break; 1387 1388 case SPIDER_NET_GPWOPCMPINT: 1389 /* PHY write operation completed */ 1390 show_error = 0; 1391 break; 1392 case SPIDER_NET_GPROPCMPINT: 1393 /* PHY read operation completed */ 1394 /* we don't use semaphores, as we poll for the completion 1395 * of the read operation in spider_net_read_phy. Should take 1396 * about 50 us 1397 */ 1398 show_error = 0; 1399 break; 1400 case SPIDER_NET_GPWFFINT: 1401 /* PHY command queue full */ 1402 if (netif_msg_intr(card)) 1403 dev_err(&card->netdev->dev, "PHY write queue full\n"); 1404 show_error = 0; 1405 break; 1406 1407 /* case SPIDER_NET_GRMDADRINT: not used. print a message */ 1408 /* case SPIDER_NET_GRMARPINT: not used. print a message */ 1409 /* case SPIDER_NET_GRMMPINT: not used. print a message */ 1410 1411 case SPIDER_NET_GDTDEN0INT: 1412 /* someone has set TX_DMA_EN to 0 */ 1413 show_error = 0; 1414 break; 1415 1416 case SPIDER_NET_GDDDEN0INT: 1417 case SPIDER_NET_GDCDEN0INT: 1418 case SPIDER_NET_GDBDEN0INT: 1419 case SPIDER_NET_GDADEN0INT: 1420 /* someone has set RX_DMA_EN to 0 */ 1421 show_error = 0; 1422 break; 1423 1424 /* RX interrupts */ 1425 case SPIDER_NET_GDDFDCINT: 1426 case SPIDER_NET_GDCFDCINT: 1427 case SPIDER_NET_GDBFDCINT: 1428 case SPIDER_NET_GDAFDCINT: 1429 /* case SPIDER_NET_GDNMINT: not used. print a message */ 1430 /* case SPIDER_NET_GCNMINT: not used. print a message */ 1431 /* case SPIDER_NET_GBNMINT: not used. print a message */ 1432 /* case SPIDER_NET_GANMINT: not used. print a message */ 1433 /* case SPIDER_NET_GRFNMINT: not used. print a message */ 1434 show_error = 0; 1435 break; 1436 1437 /* TX interrupts */ 1438 case SPIDER_NET_GDTFDCINT: 1439 show_error = 0; 1440 break; 1441 case SPIDER_NET_GTTEDINT: 1442 show_error = 0; 1443 break; 1444 case SPIDER_NET_GDTDCEINT: 1445 /* chain end. If a descriptor should be sent, kick off 1446 * tx dma 1447 if (card->tx_chain.tail != card->tx_chain.head) 1448 spider_net_kick_tx_dma(card); 1449 */ 1450 show_error = 0; 1451 break; 1452 1453 /* case SPIDER_NET_G1TMCNTINT: not used. print a message */ 1454 /* case SPIDER_NET_GFREECNTINT: not used. print a message */ 1455 } 1456 1457 /* check GHIINT1STS ************************************/ 1458 if (error_reg1) 1459 for (i = 0; i < 32; i++) 1460 if (error_reg1 & (1<<i)) 1461 switch (i) 1462 { 1463 case SPIDER_NET_GTMFLLINT: 1464 /* TX RAM full may happen on a usual case. 1465 * Logging is not needed. 1466 */ 1467 show_error = 0; 1468 break; 1469 case SPIDER_NET_GRFDFLLINT: 1470 case SPIDER_NET_GRFCFLLINT: 1471 case SPIDER_NET_GRFBFLLINT: 1472 case SPIDER_NET_GRFAFLLINT: 1473 case SPIDER_NET_GRMFLLINT: 1474 /* Could happen when rx chain is full */ 1475 if (card->ignore_rx_ramfull == 0) { 1476 card->ignore_rx_ramfull = 1; 1477 spider_net_resync_head_ptr(card); 1478 spider_net_refill_rx_chain(card); 1479 spider_net_enable_rxdmac(card); 1480 card->num_rx_ints ++; 1481 napi_schedule(&card->napi); 1482 } 1483 show_error = 0; 1484 break; 1485 1486 /* case SPIDER_NET_GTMSHTINT: problem, print a message */ 1487 case SPIDER_NET_GDTINVDINT: 1488 /* allrighty. tx from previous descr ok */ 1489 show_error = 0; 1490 break; 1491 1492 /* chain end */ 1493 case SPIDER_NET_GDDDCEINT: 1494 case SPIDER_NET_GDCDCEINT: 1495 case SPIDER_NET_GDBDCEINT: 1496 case SPIDER_NET_GDADCEINT: 1497 spider_net_resync_head_ptr(card); 1498 spider_net_refill_rx_chain(card); 1499 spider_net_enable_rxdmac(card); 1500 card->num_rx_ints ++; 1501 napi_schedule(&card->napi); 1502 show_error = 0; 1503 break; 1504 1505 /* invalid descriptor */ 1506 case SPIDER_NET_GDDINVDINT: 1507 case SPIDER_NET_GDCINVDINT: 1508 case SPIDER_NET_GDBINVDINT: 1509 case SPIDER_NET_GDAINVDINT: 1510 /* Could happen when rx chain is full */ 1511 spider_net_resync_head_ptr(card); 1512 spider_net_refill_rx_chain(card); 1513 spider_net_enable_rxdmac(card); 1514 card->num_rx_ints ++; 1515 napi_schedule(&card->napi); 1516 show_error = 0; 1517 break; 1518 1519 /* case SPIDER_NET_GDTRSERINT: problem, print a message */ 1520 /* case SPIDER_NET_GDDRSERINT: problem, print a message */ 1521 /* case SPIDER_NET_GDCRSERINT: problem, print a message */ 1522 /* case SPIDER_NET_GDBRSERINT: problem, print a message */ 1523 /* case SPIDER_NET_GDARSERINT: problem, print a message */ 1524 /* case SPIDER_NET_GDSERINT: problem, print a message */ 1525 /* case SPIDER_NET_GDTPTERINT: problem, print a message */ 1526 /* case SPIDER_NET_GDDPTERINT: problem, print a message */ 1527 /* case SPIDER_NET_GDCPTERINT: problem, print a message */ 1528 /* case SPIDER_NET_GDBPTERINT: problem, print a message */ 1529 /* case SPIDER_NET_GDAPTERINT: problem, print a message */ 1530 default: 1531 show_error = 1; 1532 break; 1533 } 1534 1535 /* check GHIINT2STS ************************************/ 1536 if (error_reg2) 1537 for (i = 0; i < 32; i++) 1538 if (error_reg2 & (1<<i)) 1539 switch (i) 1540 { 1541 /* there is nothing we can (want to) do at this time. Log a 1542 * message, we can switch on and off the specific values later on 1543 case SPIDER_NET_GPROPERINT: 1544 case SPIDER_NET_GMCTCRSNGINT: 1545 case SPIDER_NET_GMCTLCOLINT: 1546 case SPIDER_NET_GMCTTMOTINT: 1547 case SPIDER_NET_GMCRCAERINT: 1548 case SPIDER_NET_GMCRCALERINT: 1549 case SPIDER_NET_GMCRALNERINT: 1550 case SPIDER_NET_GMCROVRINT: 1551 case SPIDER_NET_GMCRRNTINT: 1552 case SPIDER_NET_GMCRRXERINT: 1553 case SPIDER_NET_GTITCSERINT: 1554 case SPIDER_NET_GTIFMTERINT: 1555 case SPIDER_NET_GTIPKTRVKINT: 1556 case SPIDER_NET_GTISPINGINT: 1557 case SPIDER_NET_GTISADNGINT: 1558 case SPIDER_NET_GTISPDNGINT: 1559 case SPIDER_NET_GRIFMTERINT: 1560 case SPIDER_NET_GRIPKTRVKINT: 1561 case SPIDER_NET_GRISPINGINT: 1562 case SPIDER_NET_GRISADNGINT: 1563 case SPIDER_NET_GRISPDNGINT: 1564 break; 1565 */ 1566 default: 1567 break; 1568 } 1569 1570 if ((show_error) && (netif_msg_intr(card)) && net_ratelimit()) 1571 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, " 1572 "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n", 1573 status_reg, error_reg1, error_reg2); 1574 1575 /* clear interrupt sources */ 1576 spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1); 1577 spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2); 1578 } 1579 1580 /** 1581 * spider_net_interrupt - interrupt handler for spider_net 1582 * @irq: interrupt number 1583 * @ptr: pointer to net_device 1584 * 1585 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no 1586 * interrupt found raised by card. 1587 * 1588 * This is the interrupt handler, that turns off 1589 * interrupts for this device and makes the stack poll the driver 1590 */ 1591 static irqreturn_t 1592 spider_net_interrupt(int irq, void *ptr) 1593 { 1594 struct net_device *netdev = ptr; 1595 struct spider_net_card *card = netdev_priv(netdev); 1596 u32 status_reg, error_reg1, error_reg2; 1597 1598 status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS); 1599 error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS); 1600 error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS); 1601 1602 if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) && 1603 !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) && 1604 !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE)) 1605 return IRQ_NONE; 1606 1607 if (status_reg & SPIDER_NET_RXINT ) { 1608 spider_net_rx_irq_off(card); 1609 napi_schedule(&card->napi); 1610 card->num_rx_ints ++; 1611 } 1612 if (status_reg & SPIDER_NET_TXINT) 1613 napi_schedule(&card->napi); 1614 1615 if (status_reg & SPIDER_NET_LINKINT) 1616 spider_net_link_reset(netdev); 1617 1618 if (status_reg & SPIDER_NET_ERRINT ) 1619 spider_net_handle_error_irq(card, status_reg, 1620 error_reg1, error_reg2); 1621 1622 /* clear interrupt sources */ 1623 spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg); 1624 1625 return IRQ_HANDLED; 1626 } 1627 1628 #ifdef CONFIG_NET_POLL_CONTROLLER 1629 /** 1630 * spider_net_poll_controller - artificial interrupt for netconsole etc. 1631 * @netdev: interface device structure 1632 * 1633 * see Documentation/networking/netconsole.rst 1634 */ 1635 static void 1636 spider_net_poll_controller(struct net_device *netdev) 1637 { 1638 disable_irq(netdev->irq); 1639 spider_net_interrupt(netdev->irq, netdev); 1640 enable_irq(netdev->irq); 1641 } 1642 #endif /* CONFIG_NET_POLL_CONTROLLER */ 1643 1644 /** 1645 * spider_net_enable_interrupts - enable interrupts 1646 * @card: card structure 1647 * 1648 * spider_net_enable_interrupt enables several interrupts 1649 */ 1650 static void 1651 spider_net_enable_interrupts(struct spider_net_card *card) 1652 { 1653 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 1654 SPIDER_NET_INT0_MASK_VALUE); 1655 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 1656 SPIDER_NET_INT1_MASK_VALUE); 1657 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 1658 SPIDER_NET_INT2_MASK_VALUE); 1659 } 1660 1661 /** 1662 * spider_net_disable_interrupts - disable interrupts 1663 * @card: card structure 1664 * 1665 * spider_net_disable_interrupts disables all the interrupts 1666 */ 1667 static void 1668 spider_net_disable_interrupts(struct spider_net_card *card) 1669 { 1670 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0); 1671 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0); 1672 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0); 1673 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0); 1674 } 1675 1676 /** 1677 * spider_net_init_card - initializes the card 1678 * @card: card structure 1679 * 1680 * spider_net_init_card initializes the card so that other registers can 1681 * be used 1682 */ 1683 static void 1684 spider_net_init_card(struct spider_net_card *card) 1685 { 1686 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 1687 SPIDER_NET_CKRCTRL_STOP_VALUE); 1688 1689 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 1690 SPIDER_NET_CKRCTRL_RUN_VALUE); 1691 1692 /* trigger ETOMOD signal */ 1693 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, 1694 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4); 1695 1696 spider_net_disable_interrupts(card); 1697 } 1698 1699 /** 1700 * spider_net_enable_card - enables the card by setting all kinds of regs 1701 * @card: card structure 1702 * 1703 * spider_net_enable_card sets a lot of SMMIO registers to enable the device 1704 */ 1705 static void 1706 spider_net_enable_card(struct spider_net_card *card) 1707 { 1708 int i; 1709 /* the following array consists of (register),(value) pairs 1710 * that are set in this function. A register of 0 ends the list 1711 */ 1712 u32 regs[][2] = { 1713 { SPIDER_NET_GRESUMINTNUM, 0 }, 1714 { SPIDER_NET_GREINTNUM, 0 }, 1715 1716 /* set interrupt frame number registers */ 1717 /* clear the single DMA engine registers first */ 1718 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1719 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1720 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1721 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1722 /* then set, what we really need */ 1723 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE }, 1724 1725 /* timer counter registers and stuff */ 1726 { SPIDER_NET_GFREECNNUM, 0 }, 1727 { SPIDER_NET_GONETIMENUM, 0 }, 1728 { SPIDER_NET_GTOUTFRMNUM, 0 }, 1729 1730 /* RX mode setting */ 1731 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE }, 1732 /* TX mode setting */ 1733 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE }, 1734 /* IPSEC mode setting */ 1735 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE }, 1736 1737 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE }, 1738 1739 { SPIDER_NET_GMRWOLCTRL, 0 }, 1740 { SPIDER_NET_GTESTMD, 0x10000000 }, 1741 { SPIDER_NET_GTTQMSK, 0x00400040 }, 1742 1743 { SPIDER_NET_GMACINTEN, 0 }, 1744 1745 /* flow control stuff */ 1746 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE }, 1747 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE }, 1748 1749 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE }, 1750 { 0, 0} 1751 }; 1752 1753 i = 0; 1754 while (regs[i][0]) { 1755 spider_net_write_reg(card, regs[i][0], regs[i][1]); 1756 i++; 1757 } 1758 1759 /* clear unicast filter table entries 1 to 14 */ 1760 for (i = 1; i <= 14; i++) { 1761 spider_net_write_reg(card, 1762 SPIDER_NET_GMRUAFILnR + i * 8, 1763 0x00080000); 1764 spider_net_write_reg(card, 1765 SPIDER_NET_GMRUAFILnR + i * 8 + 4, 1766 0x00000000); 1767 } 1768 1769 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000); 1770 1771 spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE); 1772 1773 /* set chain tail address for RX chains and 1774 * enable DMA 1775 */ 1776 spider_net_enable_rxchtails(card); 1777 spider_net_enable_rxdmac(card); 1778 1779 spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE); 1780 1781 spider_net_write_reg(card, SPIDER_NET_GMACLENLMT, 1782 SPIDER_NET_LENLMT_VALUE); 1783 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, 1784 SPIDER_NET_OPMODE_VALUE); 1785 1786 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, 1787 SPIDER_NET_GDTBSTA); 1788 } 1789 1790 /** 1791 * spider_net_download_firmware - loads firmware into the adapter 1792 * @card: card structure 1793 * @firmware_ptr: pointer to firmware data 1794 * 1795 * spider_net_download_firmware loads the firmware data into the 1796 * adapter. It assumes the length etc. to be allright. 1797 */ 1798 static int 1799 spider_net_download_firmware(struct spider_net_card *card, 1800 const void *firmware_ptr) 1801 { 1802 int sequencer, i; 1803 const u32 *fw_ptr = firmware_ptr; 1804 1805 /* stop sequencers */ 1806 spider_net_write_reg(card, SPIDER_NET_GSINIT, 1807 SPIDER_NET_STOP_SEQ_VALUE); 1808 1809 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS; 1810 sequencer++) { 1811 spider_net_write_reg(card, 1812 SPIDER_NET_GSnPRGADR + sequencer * 8, 0); 1813 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) { 1814 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT + 1815 sequencer * 8, *fw_ptr); 1816 fw_ptr++; 1817 } 1818 } 1819 1820 if (spider_net_read_reg(card, SPIDER_NET_GSINIT)) 1821 return -EIO; 1822 1823 spider_net_write_reg(card, SPIDER_NET_GSINIT, 1824 SPIDER_NET_RUN_SEQ_VALUE); 1825 1826 return 0; 1827 } 1828 1829 /** 1830 * spider_net_init_firmware - reads in firmware parts 1831 * @card: card structure 1832 * 1833 * Returns 0 on success, <0 on failure 1834 * 1835 * spider_net_init_firmware opens the sequencer firmware and does some basic 1836 * checks. This function opens and releases the firmware structure. A call 1837 * to download the firmware is performed before the release. 1838 * 1839 * Firmware format 1840 * =============== 1841 * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being 1842 * the program for each sequencer. Use the command 1843 * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \ 1844 * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \ 1845 * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin 1846 * 1847 * to generate spider_fw.bin, if you have sequencer programs with something 1848 * like the following contents for each sequencer: 1849 * <ONE LINE COMMENT> 1850 * <FIRST 4-BYTES-WORD FOR SEQUENCER> 1851 * <SECOND 4-BYTES-WORD FOR SEQUENCER> 1852 * ... 1853 * <1024th 4-BYTES-WORD FOR SEQUENCER> 1854 */ 1855 static int 1856 spider_net_init_firmware(struct spider_net_card *card) 1857 { 1858 struct firmware *firmware = NULL; 1859 struct device_node *dn; 1860 const u8 *fw_prop = NULL; 1861 int err = -ENOENT; 1862 int fw_size; 1863 1864 if (request_firmware((const struct firmware **)&firmware, 1865 SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) { 1866 if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) && 1867 netif_msg_probe(card) ) { 1868 dev_err(&card->netdev->dev, 1869 "Incorrect size of spidernet firmware in " \ 1870 "filesystem. Looking in host firmware...\n"); 1871 goto try_host_fw; 1872 } 1873 err = spider_net_download_firmware(card, firmware->data); 1874 1875 release_firmware(firmware); 1876 if (err) 1877 goto try_host_fw; 1878 1879 goto done; 1880 } 1881 1882 try_host_fw: 1883 dn = pci_device_to_OF_node(card->pdev); 1884 if (!dn) 1885 goto out_err; 1886 1887 fw_prop = of_get_property(dn, "firmware", &fw_size); 1888 if (!fw_prop) 1889 goto out_err; 1890 1891 if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) && 1892 netif_msg_probe(card) ) { 1893 dev_err(&card->netdev->dev, 1894 "Incorrect size of spidernet firmware in host firmware\n"); 1895 goto done; 1896 } 1897 1898 err = spider_net_download_firmware(card, fw_prop); 1899 1900 done: 1901 return err; 1902 out_err: 1903 if (netif_msg_probe(card)) 1904 dev_err(&card->netdev->dev, 1905 "Couldn't find spidernet firmware in filesystem " \ 1906 "or host firmware\n"); 1907 return err; 1908 } 1909 1910 /** 1911 * spider_net_open - called upon ifonfig up 1912 * @netdev: interface device structure 1913 * 1914 * returns 0 on success, <0 on failure 1915 * 1916 * spider_net_open allocates all the descriptors and memory needed for 1917 * operation, sets up multicast list and enables interrupts 1918 */ 1919 int 1920 spider_net_open(struct net_device *netdev) 1921 { 1922 struct spider_net_card *card = netdev_priv(netdev); 1923 int result; 1924 1925 result = spider_net_init_firmware(card); 1926 if (result) 1927 goto init_firmware_failed; 1928 1929 /* start probing with copper */ 1930 card->aneg_count = 0; 1931 card->medium = BCM54XX_COPPER; 1932 spider_net_setup_aneg(card); 1933 if (card->phy.def->phy_id) 1934 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 1935 1936 result = spider_net_init_chain(card, &card->tx_chain); 1937 if (result) 1938 goto alloc_tx_failed; 1939 card->low_watermark = NULL; 1940 1941 result = spider_net_init_chain(card, &card->rx_chain); 1942 if (result) 1943 goto alloc_rx_failed; 1944 1945 /* Allocate rx skbs */ 1946 result = spider_net_alloc_rx_skbs(card); 1947 if (result) 1948 goto alloc_skbs_failed; 1949 1950 spider_net_set_multi(netdev); 1951 1952 /* further enhancement: setup hw vlan, if needed */ 1953 1954 result = -EBUSY; 1955 if (request_irq(netdev->irq, spider_net_interrupt, 1956 IRQF_SHARED, netdev->name, netdev)) 1957 goto register_int_failed; 1958 1959 spider_net_enable_card(card); 1960 1961 netif_start_queue(netdev); 1962 netif_carrier_on(netdev); 1963 napi_enable(&card->napi); 1964 1965 spider_net_enable_interrupts(card); 1966 1967 return 0; 1968 1969 register_int_failed: 1970 spider_net_free_rx_chain_contents(card); 1971 alloc_skbs_failed: 1972 spider_net_free_chain(card, &card->rx_chain); 1973 alloc_rx_failed: 1974 spider_net_free_chain(card, &card->tx_chain); 1975 alloc_tx_failed: 1976 del_timer_sync(&card->aneg_timer); 1977 init_firmware_failed: 1978 return result; 1979 } 1980 1981 /** 1982 * spider_net_link_phy 1983 * @t: timer context used to obtain the pointer to net card data structure 1984 */ 1985 static void spider_net_link_phy(struct timer_list *t) 1986 { 1987 struct spider_net_card *card = from_timer(card, t, aneg_timer); 1988 struct mii_phy *phy = &card->phy; 1989 1990 /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */ 1991 if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) { 1992 1993 pr_debug("%s: link is down trying to bring it up\n", 1994 card->netdev->name); 1995 1996 switch (card->medium) { 1997 case BCM54XX_COPPER: 1998 /* enable fiber with autonegotiation first */ 1999 if (phy->def->ops->enable_fiber) 2000 phy->def->ops->enable_fiber(phy, 1); 2001 card->medium = BCM54XX_FIBER; 2002 break; 2003 2004 case BCM54XX_FIBER: 2005 /* fiber didn't come up, try to disable fiber autoneg */ 2006 if (phy->def->ops->enable_fiber) 2007 phy->def->ops->enable_fiber(phy, 0); 2008 card->medium = BCM54XX_UNKNOWN; 2009 break; 2010 2011 case BCM54XX_UNKNOWN: 2012 /* copper, fiber with and without failed, 2013 * retry from beginning 2014 */ 2015 spider_net_setup_aneg(card); 2016 card->medium = BCM54XX_COPPER; 2017 break; 2018 } 2019 2020 card->aneg_count = 0; 2021 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 2022 return; 2023 } 2024 2025 /* link still not up, try again later */ 2026 if (!(phy->def->ops->poll_link(phy))) { 2027 card->aneg_count++; 2028 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 2029 return; 2030 } 2031 2032 /* link came up, get abilities */ 2033 phy->def->ops->read_link(phy); 2034 2035 spider_net_write_reg(card, SPIDER_NET_GMACST, 2036 spider_net_read_reg(card, SPIDER_NET_GMACST)); 2037 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4); 2038 2039 if (phy->speed == 1000) 2040 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001); 2041 else 2042 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0); 2043 2044 card->aneg_count = 0; 2045 2046 pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n", 2047 card->netdev->name, phy->speed, 2048 phy->duplex == 1 ? "Full" : "Half", 2049 phy->autoneg == 1 ? "" : "no "); 2050 } 2051 2052 /** 2053 * spider_net_setup_phy - setup PHY 2054 * @card: card structure 2055 * 2056 * returns 0 on success, <0 on failure 2057 * 2058 * spider_net_setup_phy is used as part of spider_net_probe. 2059 **/ 2060 static int 2061 spider_net_setup_phy(struct spider_net_card *card) 2062 { 2063 struct mii_phy *phy = &card->phy; 2064 2065 spider_net_write_reg(card, SPIDER_NET_GDTDMASEL, 2066 SPIDER_NET_DMASEL_VALUE); 2067 spider_net_write_reg(card, SPIDER_NET_GPCCTRL, 2068 SPIDER_NET_PHY_CTRL_VALUE); 2069 2070 phy->dev = card->netdev; 2071 phy->mdio_read = spider_net_read_phy; 2072 phy->mdio_write = spider_net_write_phy; 2073 2074 for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) { 2075 unsigned short id; 2076 id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR); 2077 if (id != 0x0000 && id != 0xffff) { 2078 if (!sungem_phy_probe(phy, phy->mii_id)) { 2079 pr_info("Found %s.\n", phy->def->name); 2080 break; 2081 } 2082 } 2083 } 2084 2085 return 0; 2086 } 2087 2088 /** 2089 * spider_net_workaround_rxramfull - work around firmware bug 2090 * @card: card structure 2091 * 2092 * no return value 2093 **/ 2094 static void 2095 spider_net_workaround_rxramfull(struct spider_net_card *card) 2096 { 2097 int i, sequencer = 0; 2098 2099 /* cancel reset */ 2100 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 2101 SPIDER_NET_CKRCTRL_RUN_VALUE); 2102 2103 /* empty sequencer data */ 2104 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS; 2105 sequencer++) { 2106 spider_net_write_reg(card, SPIDER_NET_GSnPRGADR + 2107 sequencer * 8, 0x0); 2108 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) { 2109 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT + 2110 sequencer * 8, 0x0); 2111 } 2112 } 2113 2114 /* set sequencer operation */ 2115 spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe); 2116 2117 /* reset */ 2118 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 2119 SPIDER_NET_CKRCTRL_STOP_VALUE); 2120 } 2121 2122 /** 2123 * spider_net_stop - called upon ifconfig down 2124 * @netdev: interface device structure 2125 * 2126 * always returns 0 2127 */ 2128 int 2129 spider_net_stop(struct net_device *netdev) 2130 { 2131 struct spider_net_card *card = netdev_priv(netdev); 2132 2133 napi_disable(&card->napi); 2134 netif_carrier_off(netdev); 2135 netif_stop_queue(netdev); 2136 del_timer_sync(&card->tx_timer); 2137 del_timer_sync(&card->aneg_timer); 2138 2139 spider_net_disable_interrupts(card); 2140 2141 free_irq(netdev->irq, netdev); 2142 2143 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, 2144 SPIDER_NET_DMA_TX_FEND_VALUE); 2145 2146 /* turn off DMA, force end */ 2147 spider_net_disable_rxdmac(card); 2148 2149 /* release chains */ 2150 spider_net_release_tx_chain(card, 1); 2151 spider_net_free_rx_chain_contents(card); 2152 2153 spider_net_free_chain(card, &card->tx_chain); 2154 spider_net_free_chain(card, &card->rx_chain); 2155 2156 return 0; 2157 } 2158 2159 /** 2160 * spider_net_tx_timeout_task - task scheduled by the watchdog timeout 2161 * function (to be called not under interrupt status) 2162 * @work: work context used to obtain the pointer to net card data structure 2163 * 2164 * called as task when tx hangs, resets interface (if interface is up) 2165 */ 2166 static void 2167 spider_net_tx_timeout_task(struct work_struct *work) 2168 { 2169 struct spider_net_card *card = 2170 container_of(work, struct spider_net_card, tx_timeout_task); 2171 struct net_device *netdev = card->netdev; 2172 2173 if (!(netdev->flags & IFF_UP)) 2174 goto out; 2175 2176 netif_device_detach(netdev); 2177 spider_net_stop(netdev); 2178 2179 spider_net_workaround_rxramfull(card); 2180 spider_net_init_card(card); 2181 2182 if (spider_net_setup_phy(card)) 2183 goto out; 2184 2185 spider_net_open(netdev); 2186 spider_net_kick_tx_dma(card); 2187 netif_device_attach(netdev); 2188 2189 out: 2190 atomic_dec(&card->tx_timeout_task_counter); 2191 } 2192 2193 /** 2194 * spider_net_tx_timeout - called when the tx timeout watchdog kicks in. 2195 * @netdev: interface device structure 2196 * @txqueue: unused 2197 * 2198 * called, if tx hangs. Schedules a task that resets the interface 2199 */ 2200 static void 2201 spider_net_tx_timeout(struct net_device *netdev, unsigned int txqueue) 2202 { 2203 struct spider_net_card *card; 2204 2205 card = netdev_priv(netdev); 2206 atomic_inc(&card->tx_timeout_task_counter); 2207 if (netdev->flags & IFF_UP) 2208 schedule_work(&card->tx_timeout_task); 2209 else 2210 atomic_dec(&card->tx_timeout_task_counter); 2211 card->spider_stats.tx_timeouts++; 2212 } 2213 2214 static const struct net_device_ops spider_net_ops = { 2215 .ndo_open = spider_net_open, 2216 .ndo_stop = spider_net_stop, 2217 .ndo_start_xmit = spider_net_xmit, 2218 .ndo_set_rx_mode = spider_net_set_multi, 2219 .ndo_set_mac_address = spider_net_set_mac, 2220 .ndo_eth_ioctl = spider_net_do_ioctl, 2221 .ndo_tx_timeout = spider_net_tx_timeout, 2222 .ndo_validate_addr = eth_validate_addr, 2223 /* HW VLAN */ 2224 #ifdef CONFIG_NET_POLL_CONTROLLER 2225 /* poll controller */ 2226 .ndo_poll_controller = spider_net_poll_controller, 2227 #endif /* CONFIG_NET_POLL_CONTROLLER */ 2228 }; 2229 2230 /** 2231 * spider_net_setup_netdev_ops - initialization of net_device operations 2232 * @netdev: net_device structure 2233 * 2234 * fills out function pointers in the net_device structure 2235 */ 2236 static void 2237 spider_net_setup_netdev_ops(struct net_device *netdev) 2238 { 2239 netdev->netdev_ops = &spider_net_ops; 2240 netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT; 2241 /* ethtool ops */ 2242 netdev->ethtool_ops = &spider_net_ethtool_ops; 2243 } 2244 2245 /** 2246 * spider_net_setup_netdev - initialization of net_device 2247 * @card: card structure 2248 * 2249 * Returns 0 on success or <0 on failure 2250 * 2251 * spider_net_setup_netdev initializes the net_device structure 2252 **/ 2253 static int 2254 spider_net_setup_netdev(struct spider_net_card *card) 2255 { 2256 int result; 2257 struct net_device *netdev = card->netdev; 2258 struct device_node *dn; 2259 struct sockaddr addr; 2260 const u8 *mac; 2261 2262 SET_NETDEV_DEV(netdev, &card->pdev->dev); 2263 2264 pci_set_drvdata(card->pdev, netdev); 2265 2266 timer_setup(&card->tx_timer, spider_net_cleanup_tx_ring, 0); 2267 netdev->irq = card->pdev->irq; 2268 2269 card->aneg_count = 0; 2270 timer_setup(&card->aneg_timer, spider_net_link_phy, 0); 2271 2272 netif_napi_add(netdev, &card->napi, 2273 spider_net_poll, SPIDER_NET_NAPI_WEIGHT); 2274 2275 spider_net_setup_netdev_ops(netdev); 2276 2277 netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM; 2278 if (SPIDER_NET_RX_CSUM_DEFAULT) 2279 netdev->features |= NETIF_F_RXCSUM; 2280 netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX; 2281 /* some time: NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | 2282 * NETIF_F_HW_VLAN_CTAG_FILTER 2283 */ 2284 2285 /* MTU range: 64 - 2294 */ 2286 netdev->min_mtu = SPIDER_NET_MIN_MTU; 2287 netdev->max_mtu = SPIDER_NET_MAX_MTU; 2288 2289 netdev->irq = card->pdev->irq; 2290 card->num_rx_ints = 0; 2291 card->ignore_rx_ramfull = 0; 2292 2293 dn = pci_device_to_OF_node(card->pdev); 2294 if (!dn) 2295 return -EIO; 2296 2297 mac = of_get_property(dn, "local-mac-address", NULL); 2298 if (!mac) 2299 return -EIO; 2300 memcpy(addr.sa_data, mac, ETH_ALEN); 2301 2302 result = spider_net_set_mac(netdev, &addr); 2303 if ((result) && (netif_msg_probe(card))) 2304 dev_err(&card->netdev->dev, 2305 "Failed to set MAC address: %i\n", result); 2306 2307 result = register_netdev(netdev); 2308 if (result) { 2309 if (netif_msg_probe(card)) 2310 dev_err(&card->netdev->dev, 2311 "Couldn't register net_device: %i\n", result); 2312 return result; 2313 } 2314 2315 if (netif_msg_probe(card)) 2316 pr_info("Initialized device %s.\n", netdev->name); 2317 2318 return 0; 2319 } 2320 2321 /** 2322 * spider_net_alloc_card - allocates net_device and card structure 2323 * 2324 * returns the card structure or NULL in case of errors 2325 * 2326 * the card and net_device structures are linked to each other 2327 */ 2328 static struct spider_net_card * 2329 spider_net_alloc_card(void) 2330 { 2331 struct net_device *netdev; 2332 struct spider_net_card *card; 2333 2334 netdev = alloc_etherdev(struct_size(card, darray, 2335 tx_descriptors + rx_descriptors)); 2336 if (!netdev) 2337 return NULL; 2338 2339 card = netdev_priv(netdev); 2340 card->netdev = netdev; 2341 card->msg_enable = SPIDER_NET_DEFAULT_MSG; 2342 INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task); 2343 init_waitqueue_head(&card->waitq); 2344 atomic_set(&card->tx_timeout_task_counter, 0); 2345 2346 card->rx_chain.num_desc = rx_descriptors; 2347 card->rx_chain.ring = card->darray; 2348 card->tx_chain.num_desc = tx_descriptors; 2349 card->tx_chain.ring = card->darray + rx_descriptors; 2350 2351 return card; 2352 } 2353 2354 /** 2355 * spider_net_undo_pci_setup - releases PCI ressources 2356 * @card: card structure 2357 * 2358 * spider_net_undo_pci_setup releases the mapped regions 2359 */ 2360 static void 2361 spider_net_undo_pci_setup(struct spider_net_card *card) 2362 { 2363 iounmap(card->regs); 2364 pci_release_regions(card->pdev); 2365 } 2366 2367 /** 2368 * spider_net_setup_pci_dev - sets up the device in terms of PCI operations 2369 * @pdev: PCI device 2370 * 2371 * Returns the card structure or NULL if any errors occur 2372 * 2373 * spider_net_setup_pci_dev initializes pdev and together with the 2374 * functions called in spider_net_open configures the device so that 2375 * data can be transferred over it 2376 * The net_device structure is attached to the card structure, if the 2377 * function returns without error. 2378 **/ 2379 static struct spider_net_card * 2380 spider_net_setup_pci_dev(struct pci_dev *pdev) 2381 { 2382 struct spider_net_card *card; 2383 unsigned long mmio_start, mmio_len; 2384 2385 if (pci_enable_device(pdev)) { 2386 dev_err(&pdev->dev, "Couldn't enable PCI device\n"); 2387 return NULL; 2388 } 2389 2390 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) { 2391 dev_err(&pdev->dev, 2392 "Couldn't find proper PCI device base address.\n"); 2393 goto out_disable_dev; 2394 } 2395 2396 if (pci_request_regions(pdev, spider_net_driver_name)) { 2397 dev_err(&pdev->dev, 2398 "Couldn't obtain PCI resources, aborting.\n"); 2399 goto out_disable_dev; 2400 } 2401 2402 pci_set_master(pdev); 2403 2404 card = spider_net_alloc_card(); 2405 if (!card) { 2406 dev_err(&pdev->dev, 2407 "Couldn't allocate net_device structure, aborting.\n"); 2408 goto out_release_regions; 2409 } 2410 card->pdev = pdev; 2411 2412 /* fetch base address and length of first resource */ 2413 mmio_start = pci_resource_start(pdev, 0); 2414 mmio_len = pci_resource_len(pdev, 0); 2415 2416 card->netdev->mem_start = mmio_start; 2417 card->netdev->mem_end = mmio_start + mmio_len; 2418 card->regs = ioremap(mmio_start, mmio_len); 2419 2420 if (!card->regs) { 2421 dev_err(&pdev->dev, 2422 "Couldn't obtain PCI resources, aborting.\n"); 2423 goto out_release_regions; 2424 } 2425 2426 return card; 2427 2428 out_release_regions: 2429 pci_release_regions(pdev); 2430 out_disable_dev: 2431 pci_disable_device(pdev); 2432 return NULL; 2433 } 2434 2435 /** 2436 * spider_net_probe - initialization of a device 2437 * @pdev: PCI device 2438 * @ent: entry in the device id list 2439 * 2440 * Returns 0 on success, <0 on failure 2441 * 2442 * spider_net_probe initializes pdev and registers a net_device 2443 * structure for it. After that, the device can be ifconfig'ed up 2444 **/ 2445 static int 2446 spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 2447 { 2448 int err = -EIO; 2449 struct spider_net_card *card; 2450 2451 card = spider_net_setup_pci_dev(pdev); 2452 if (!card) 2453 goto out; 2454 2455 spider_net_workaround_rxramfull(card); 2456 spider_net_init_card(card); 2457 2458 err = spider_net_setup_phy(card); 2459 if (err) 2460 goto out_undo_pci; 2461 2462 err = spider_net_setup_netdev(card); 2463 if (err) 2464 goto out_undo_pci; 2465 2466 return 0; 2467 2468 out_undo_pci: 2469 spider_net_undo_pci_setup(card); 2470 free_netdev(card->netdev); 2471 out: 2472 return err; 2473 } 2474 2475 /** 2476 * spider_net_remove - removal of a device 2477 * @pdev: PCI device 2478 * 2479 * Returns 0 on success, <0 on failure 2480 * 2481 * spider_net_remove is called to remove the device and unregisters the 2482 * net_device 2483 **/ 2484 static void 2485 spider_net_remove(struct pci_dev *pdev) 2486 { 2487 struct net_device *netdev; 2488 struct spider_net_card *card; 2489 2490 netdev = pci_get_drvdata(pdev); 2491 card = netdev_priv(netdev); 2492 2493 wait_event(card->waitq, 2494 atomic_read(&card->tx_timeout_task_counter) == 0); 2495 2496 unregister_netdev(netdev); 2497 2498 /* switch off card */ 2499 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 2500 SPIDER_NET_CKRCTRL_STOP_VALUE); 2501 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 2502 SPIDER_NET_CKRCTRL_RUN_VALUE); 2503 2504 spider_net_undo_pci_setup(card); 2505 free_netdev(netdev); 2506 } 2507 2508 static struct pci_driver spider_net_driver = { 2509 .name = spider_net_driver_name, 2510 .id_table = spider_net_pci_tbl, 2511 .probe = spider_net_probe, 2512 .remove = spider_net_remove 2513 }; 2514 2515 /** 2516 * spider_net_init - init function when the driver is loaded 2517 * 2518 * spider_net_init registers the device driver 2519 */ 2520 static int __init spider_net_init(void) 2521 { 2522 printk(KERN_INFO "Spidernet version %s.\n", VERSION); 2523 2524 if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) { 2525 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN; 2526 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors); 2527 } 2528 if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) { 2529 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX; 2530 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors); 2531 } 2532 if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) { 2533 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN; 2534 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors); 2535 } 2536 if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) { 2537 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX; 2538 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors); 2539 } 2540 2541 return pci_register_driver(&spider_net_driver); 2542 } 2543 2544 /** 2545 * spider_net_cleanup - exit function when driver is unloaded 2546 * 2547 * spider_net_cleanup unregisters the device driver 2548 */ 2549 static void __exit spider_net_cleanup(void) 2550 { 2551 pci_unregister_driver(&spider_net_driver); 2552 } 2553 2554 module_init(spider_net_init); 2555 module_exit(spider_net_cleanup); 2556