1/* 2 * Network device driver for Cell Processor-Based Blade and Celleb platform 3 * 4 * (C) Copyright IBM Corp. 2005 5 * (C) Copyright 2006 TOSHIBA CORPORATION 6 * 7 * Authors : Utz Bacher <utz.bacher@de.ibm.com> 8 * Jens Osterkamp <Jens.Osterkamp@de.ibm.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 23 */ 24 25#include <linux/compiler.h> 26#include <linux/crc32.h> 27#include <linux/delay.h> 28#include <linux/etherdevice.h> 29#include <linux/ethtool.h> 30#include <linux/firmware.h> 31#include <linux/if_vlan.h> 32#include <linux/in.h> 33#include <linux/init.h> 34#include <linux/interrupt.h> 35#include <linux/gfp.h> 36#include <linux/ioport.h> 37#include <linux/ip.h> 38#include <linux/kernel.h> 39#include <linux/mii.h> 40#include <linux/module.h> 41#include <linux/netdevice.h> 42#include <linux/device.h> 43#include <linux/pci.h> 44#include <linux/skbuff.h> 45#include <linux/tcp.h> 46#include <linux/types.h> 47#include <linux/vmalloc.h> 48#include <linux/wait.h> 49#include <linux/workqueue.h> 50#include <linux/bitops.h> 51#include <asm/pci-bridge.h> 52#include <net/checksum.h> 53 54#include "spider_net.h" 55 56MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \ 57 "<Jens.Osterkamp@de.ibm.com>"); 58MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver"); 59MODULE_LICENSE("GPL"); 60MODULE_VERSION(VERSION); 61MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME); 62 63static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT; 64static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT; 65 66module_param(rx_descriptors, int, 0444); 67module_param(tx_descriptors, int, 0444); 68 69MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \ 70 "in rx chains"); 71MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \ 72 "in tx chain"); 73 74char spider_net_driver_name[] = "spidernet"; 75 76static const struct pci_device_id spider_net_pci_tbl[] = { 77 { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET, 78 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, 79 { 0, } 80}; 81 82MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl); 83 84/** 85 * spider_net_read_reg - reads an SMMIO register of a card 86 * @card: device structure 87 * @reg: register to read from 88 * 89 * returns the content of the specified SMMIO register. 90 */ 91static inline u32 92spider_net_read_reg(struct spider_net_card *card, u32 reg) 93{ 94 /* We use the powerpc specific variants instead of readl_be() because 95 * we know spidernet is not a real PCI device and we can thus avoid the 96 * performance hit caused by the PCI workarounds. 97 */ 98 return in_be32(card->regs + reg); 99} 100 101/** 102 * spider_net_write_reg - writes to an SMMIO register of a card 103 * @card: device structure 104 * @reg: register to write to 105 * @value: value to write into the specified SMMIO register 106 */ 107static inline void 108spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value) 109{ 110 /* We use the powerpc specific variants instead of writel_be() because 111 * we know spidernet is not a real PCI device and we can thus avoid the 112 * performance hit caused by the PCI workarounds. 113 */ 114 out_be32(card->regs + reg, value); 115} 116 117/** 118 * spider_net_write_phy - write to phy register 119 * @netdev: adapter to be written to 120 * @mii_id: id of MII 121 * @reg: PHY register 122 * @val: value to be written to phy register 123 * 124 * spider_net_write_phy_register writes to an arbitrary PHY 125 * register via the spider GPCWOPCMD register. We assume the queue does 126 * not run full (not more than 15 commands outstanding). 127 **/ 128static void 129spider_net_write_phy(struct net_device *netdev, int mii_id, 130 int reg, int val) 131{ 132 struct spider_net_card *card = netdev_priv(netdev); 133 u32 writevalue; 134 135 writevalue = ((u32)mii_id << 21) | 136 ((u32)reg << 16) | ((u32)val); 137 138 spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue); 139} 140 141/** 142 * spider_net_read_phy - read from phy register 143 * @netdev: network device to be read from 144 * @mii_id: id of MII 145 * @reg: PHY register 146 * 147 * Returns value read from PHY register 148 * 149 * spider_net_write_phy reads from an arbitrary PHY 150 * register via the spider GPCROPCMD register 151 **/ 152static int 153spider_net_read_phy(struct net_device *netdev, int mii_id, int reg) 154{ 155 struct spider_net_card *card = netdev_priv(netdev); 156 u32 readvalue; 157 158 readvalue = ((u32)mii_id << 21) | ((u32)reg << 16); 159 spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue); 160 161 /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT 162 * interrupt, as we poll for the completion of the read operation 163 * in spider_net_read_phy. Should take about 50 us */ 164 do { 165 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD); 166 } while (readvalue & SPIDER_NET_GPREXEC); 167 168 readvalue &= SPIDER_NET_GPRDAT_MASK; 169 170 return readvalue; 171} 172 173/** 174 * spider_net_setup_aneg - initial auto-negotiation setup 175 * @card: device structure 176 **/ 177static void 178spider_net_setup_aneg(struct spider_net_card *card) 179{ 180 struct mii_phy *phy = &card->phy; 181 u32 advertise = 0; 182 u16 bmsr, estat; 183 184 bmsr = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR); 185 estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS); 186 187 if (bmsr & BMSR_10HALF) 188 advertise |= ADVERTISED_10baseT_Half; 189 if (bmsr & BMSR_10FULL) 190 advertise |= ADVERTISED_10baseT_Full; 191 if (bmsr & BMSR_100HALF) 192 advertise |= ADVERTISED_100baseT_Half; 193 if (bmsr & BMSR_100FULL) 194 advertise |= ADVERTISED_100baseT_Full; 195 196 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL)) 197 advertise |= SUPPORTED_1000baseT_Full; 198 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF)) 199 advertise |= SUPPORTED_1000baseT_Half; 200 201 sungem_phy_probe(phy, phy->mii_id); 202 phy->def->ops->setup_aneg(phy, advertise); 203 204} 205 206/** 207 * spider_net_rx_irq_off - switch off rx irq on this spider card 208 * @card: device structure 209 * 210 * switches off rx irq by masking them out in the GHIINTnMSK register 211 */ 212static void 213spider_net_rx_irq_off(struct spider_net_card *card) 214{ 215 u32 regvalue; 216 217 regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT); 218 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue); 219} 220 221/** 222 * spider_net_rx_irq_on - switch on rx irq on this spider card 223 * @card: device structure 224 * 225 * switches on rx irq by enabling them in the GHIINTnMSK register 226 */ 227static void 228spider_net_rx_irq_on(struct spider_net_card *card) 229{ 230 u32 regvalue; 231 232 regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT; 233 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue); 234} 235 236/** 237 * spider_net_set_promisc - sets the unicast address or the promiscuous mode 238 * @card: card structure 239 * 240 * spider_net_set_promisc sets the unicast destination address filter and 241 * thus either allows for non-promisc mode or promisc mode 242 */ 243static void 244spider_net_set_promisc(struct spider_net_card *card) 245{ 246 u32 macu, macl; 247 struct net_device *netdev = card->netdev; 248 249 if (netdev->flags & IFF_PROMISC) { 250 /* clear destination entry 0 */ 251 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0); 252 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0); 253 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 254 SPIDER_NET_PROMISC_VALUE); 255 } else { 256 macu = netdev->dev_addr[0]; 257 macu <<= 8; 258 macu |= netdev->dev_addr[1]; 259 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl)); 260 261 macu |= SPIDER_NET_UA_DESCR_VALUE; 262 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu); 263 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl); 264 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 265 SPIDER_NET_NONPROMISC_VALUE); 266 } 267} 268 269/** 270 * spider_net_get_descr_status -- returns the status of a descriptor 271 * @descr: descriptor to look at 272 * 273 * returns the status as in the dmac_cmd_status field of the descriptor 274 */ 275static inline int 276spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr) 277{ 278 return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK; 279} 280 281/** 282 * spider_net_free_chain - free descriptor chain 283 * @card: card structure 284 * @chain: address of chain 285 * 286 */ 287static void 288spider_net_free_chain(struct spider_net_card *card, 289 struct spider_net_descr_chain *chain) 290{ 291 struct spider_net_descr *descr; 292 293 descr = chain->ring; 294 do { 295 descr->bus_addr = 0; 296 descr->hwdescr->next_descr_addr = 0; 297 descr = descr->next; 298 } while (descr != chain->ring); 299 300 dma_free_coherent(&card->pdev->dev, chain->num_desc, 301 chain->hwring, chain->dma_addr); 302} 303 304/** 305 * spider_net_init_chain - alloc and link descriptor chain 306 * @card: card structure 307 * @chain: address of chain 308 * 309 * We manage a circular list that mirrors the hardware structure, 310 * except that the hardware uses bus addresses. 311 * 312 * Returns 0 on success, <0 on failure 313 */ 314static int 315spider_net_init_chain(struct spider_net_card *card, 316 struct spider_net_descr_chain *chain) 317{ 318 int i; 319 struct spider_net_descr *descr; 320 struct spider_net_hw_descr *hwdescr; 321 dma_addr_t buf; 322 size_t alloc_size; 323 324 alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr); 325 326 chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size, 327 &chain->dma_addr, GFP_KERNEL); 328 if (!chain->hwring) 329 return -ENOMEM; 330 331 memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr)); 332 333 /* Set up the hardware pointers in each descriptor */ 334 descr = chain->ring; 335 hwdescr = chain->hwring; 336 buf = chain->dma_addr; 337 for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) { 338 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 339 hwdescr->next_descr_addr = 0; 340 341 descr->hwdescr = hwdescr; 342 descr->bus_addr = buf; 343 descr->next = descr + 1; 344 descr->prev = descr - 1; 345 346 buf += sizeof(struct spider_net_hw_descr); 347 } 348 /* do actual circular list */ 349 (descr-1)->next = chain->ring; 350 chain->ring->prev = descr-1; 351 352 spin_lock_init(&chain->lock); 353 chain->head = chain->ring; 354 chain->tail = chain->ring; 355 return 0; 356} 357 358/** 359 * spider_net_free_rx_chain_contents - frees descr contents in rx chain 360 * @card: card structure 361 * 362 * returns 0 on success, <0 on failure 363 */ 364static void 365spider_net_free_rx_chain_contents(struct spider_net_card *card) 366{ 367 struct spider_net_descr *descr; 368 369 descr = card->rx_chain.head; 370 do { 371 if (descr->skb) { 372 pci_unmap_single(card->pdev, descr->hwdescr->buf_addr, 373 SPIDER_NET_MAX_FRAME, 374 PCI_DMA_BIDIRECTIONAL); 375 dev_kfree_skb(descr->skb); 376 descr->skb = NULL; 377 } 378 descr = descr->next; 379 } while (descr != card->rx_chain.head); 380} 381 382/** 383 * spider_net_prepare_rx_descr - Reinitialize RX descriptor 384 * @card: card structure 385 * @descr: descriptor to re-init 386 * 387 * Return 0 on success, <0 on failure. 388 * 389 * Allocates a new rx skb, iommu-maps it and attaches it to the 390 * descriptor. Mark the descriptor as activated, ready-to-use. 391 */ 392static int 393spider_net_prepare_rx_descr(struct spider_net_card *card, 394 struct spider_net_descr *descr) 395{ 396 struct spider_net_hw_descr *hwdescr = descr->hwdescr; 397 dma_addr_t buf; 398 int offset; 399 int bufsize; 400 401 /* we need to round up the buffer size to a multiple of 128 */ 402 bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) & 403 (~(SPIDER_NET_RXBUF_ALIGN - 1)); 404 405 /* and we need to have it 128 byte aligned, therefore we allocate a 406 * bit more */ 407 /* allocate an skb */ 408 descr->skb = netdev_alloc_skb(card->netdev, 409 bufsize + SPIDER_NET_RXBUF_ALIGN - 1); 410 if (!descr->skb) { 411 if (netif_msg_rx_err(card) && net_ratelimit()) 412 dev_err(&card->netdev->dev, 413 "Not enough memory to allocate rx buffer\n"); 414 card->spider_stats.alloc_rx_skb_error++; 415 return -ENOMEM; 416 } 417 hwdescr->buf_size = bufsize; 418 hwdescr->result_size = 0; 419 hwdescr->valid_size = 0; 420 hwdescr->data_status = 0; 421 hwdescr->data_error = 0; 422 423 offset = ((unsigned long)descr->skb->data) & 424 (SPIDER_NET_RXBUF_ALIGN - 1); 425 if (offset) 426 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset); 427 /* iommu-map the skb */ 428 buf = pci_map_single(card->pdev, descr->skb->data, 429 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE); 430 if (pci_dma_mapping_error(card->pdev, buf)) { 431 dev_kfree_skb_any(descr->skb); 432 descr->skb = NULL; 433 if (netif_msg_rx_err(card) && net_ratelimit()) 434 dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n"); 435 card->spider_stats.rx_iommu_map_error++; 436 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 437 } else { 438 hwdescr->buf_addr = buf; 439 wmb(); 440 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED | 441 SPIDER_NET_DMAC_NOINTR_COMPLETE; 442 } 443 444 return 0; 445} 446 447/** 448 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses 449 * @card: card structure 450 * 451 * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the 452 * chip by writing to the appropriate register. DMA is enabled in 453 * spider_net_enable_rxdmac. 454 */ 455static inline void 456spider_net_enable_rxchtails(struct spider_net_card *card) 457{ 458 /* assume chain is aligned correctly */ 459 spider_net_write_reg(card, SPIDER_NET_GDADCHA , 460 card->rx_chain.tail->bus_addr); 461} 462 463/** 464 * spider_net_enable_rxdmac - enables a receive DMA controller 465 * @card: card structure 466 * 467 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN 468 * in the GDADMACCNTR register 469 */ 470static inline void 471spider_net_enable_rxdmac(struct spider_net_card *card) 472{ 473 wmb(); 474 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR, 475 SPIDER_NET_DMA_RX_VALUE); 476} 477 478/** 479 * spider_net_disable_rxdmac - disables the receive DMA controller 480 * @card: card structure 481 * 482 * spider_net_disable_rxdmac terminates processing on the DMA controller 483 * by turing off the DMA controller, with the force-end flag set. 484 */ 485static inline void 486spider_net_disable_rxdmac(struct spider_net_card *card) 487{ 488 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR, 489 SPIDER_NET_DMA_RX_FEND_VALUE); 490} 491 492/** 493 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains 494 * @card: card structure 495 * 496 * refills descriptors in the rx chain: allocates skbs and iommu-maps them. 497 */ 498static void 499spider_net_refill_rx_chain(struct spider_net_card *card) 500{ 501 struct spider_net_descr_chain *chain = &card->rx_chain; 502 unsigned long flags; 503 504 /* one context doing the refill (and a second context seeing that 505 * and omitting it) is ok. If called by NAPI, we'll be called again 506 * as spider_net_decode_one_descr is called several times. If some 507 * interrupt calls us, the NAPI is about to clean up anyway. */ 508 if (!spin_trylock_irqsave(&chain->lock, flags)) 509 return; 510 511 while (spider_net_get_descr_status(chain->head->hwdescr) == 512 SPIDER_NET_DESCR_NOT_IN_USE) { 513 if (spider_net_prepare_rx_descr(card, chain->head)) 514 break; 515 chain->head = chain->head->next; 516 } 517 518 spin_unlock_irqrestore(&chain->lock, flags); 519} 520 521/** 522 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains 523 * @card: card structure 524 * 525 * Returns 0 on success, <0 on failure. 526 */ 527static int 528spider_net_alloc_rx_skbs(struct spider_net_card *card) 529{ 530 struct spider_net_descr_chain *chain = &card->rx_chain; 531 struct spider_net_descr *start = chain->tail; 532 struct spider_net_descr *descr = start; 533 534 /* Link up the hardware chain pointers */ 535 do { 536 descr->prev->hwdescr->next_descr_addr = descr->bus_addr; 537 descr = descr->next; 538 } while (descr != start); 539 540 /* Put at least one buffer into the chain. if this fails, 541 * we've got a problem. If not, spider_net_refill_rx_chain 542 * will do the rest at the end of this function. */ 543 if (spider_net_prepare_rx_descr(card, chain->head)) 544 goto error; 545 else 546 chain->head = chain->head->next; 547 548 /* This will allocate the rest of the rx buffers; 549 * if not, it's business as usual later on. */ 550 spider_net_refill_rx_chain(card); 551 spider_net_enable_rxdmac(card); 552 return 0; 553 554error: 555 spider_net_free_rx_chain_contents(card); 556 return -ENOMEM; 557} 558 559/** 560 * spider_net_get_multicast_hash - generates hash for multicast filter table 561 * @addr: multicast address 562 * 563 * returns the hash value. 564 * 565 * spider_net_get_multicast_hash calculates a hash value for a given multicast 566 * address, that is used to set the multicast filter tables 567 */ 568static u8 569spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr) 570{ 571 u32 crc; 572 u8 hash; 573 char addr_for_crc[ETH_ALEN] = { 0, }; 574 int i, bit; 575 576 for (i = 0; i < ETH_ALEN * 8; i++) { 577 bit = (addr[i / 8] >> (i % 8)) & 1; 578 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8)); 579 } 580 581 crc = crc32_be(~0, addr_for_crc, netdev->addr_len); 582 583 hash = (crc >> 27); 584 hash <<= 3; 585 hash |= crc & 7; 586 hash &= 0xff; 587 588 return hash; 589} 590 591/** 592 * spider_net_set_multi - sets multicast addresses and promisc flags 593 * @netdev: interface device structure 594 * 595 * spider_net_set_multi configures multicast addresses as needed for the 596 * netdev interface. It also sets up multicast, allmulti and promisc 597 * flags appropriately 598 */ 599static void 600spider_net_set_multi(struct net_device *netdev) 601{ 602 struct netdev_hw_addr *ha; 603 u8 hash; 604 int i; 605 u32 reg; 606 struct spider_net_card *card = netdev_priv(netdev); 607 unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] = 608 {0, }; 609 610 spider_net_set_promisc(card); 611 612 if (netdev->flags & IFF_ALLMULTI) { 613 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) { 614 set_bit(i, bitmask); 615 } 616 goto write_hash; 617 } 618 619 /* well, we know, what the broadcast hash value is: it's xfd 620 hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */ 621 set_bit(0xfd, bitmask); 622 623 netdev_for_each_mc_addr(ha, netdev) { 624 hash = spider_net_get_multicast_hash(netdev, ha->addr); 625 set_bit(hash, bitmask); 626 } 627 628write_hash: 629 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) { 630 reg = 0; 631 if (test_bit(i * 4, bitmask)) 632 reg += 0x08; 633 reg <<= 8; 634 if (test_bit(i * 4 + 1, bitmask)) 635 reg += 0x08; 636 reg <<= 8; 637 if (test_bit(i * 4 + 2, bitmask)) 638 reg += 0x08; 639 reg <<= 8; 640 if (test_bit(i * 4 + 3, bitmask)) 641 reg += 0x08; 642 643 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg); 644 } 645} 646 647/** 648 * spider_net_prepare_tx_descr - fill tx descriptor with skb data 649 * @card: card structure 650 * @skb: packet to use 651 * 652 * returns 0 on success, <0 on failure. 653 * 654 * fills out the descriptor structure with skb data and len. Copies data, 655 * if needed (32bit DMA!) 656 */ 657static int 658spider_net_prepare_tx_descr(struct spider_net_card *card, 659 struct sk_buff *skb) 660{ 661 struct spider_net_descr_chain *chain = &card->tx_chain; 662 struct spider_net_descr *descr; 663 struct spider_net_hw_descr *hwdescr; 664 dma_addr_t buf; 665 unsigned long flags; 666 667 buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE); 668 if (pci_dma_mapping_error(card->pdev, buf)) { 669 if (netif_msg_tx_err(card) && net_ratelimit()) 670 dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). " 671 "Dropping packet\n", skb->data, skb->len); 672 card->spider_stats.tx_iommu_map_error++; 673 return -ENOMEM; 674 } 675 676 spin_lock_irqsave(&chain->lock, flags); 677 descr = card->tx_chain.head; 678 if (descr->next == chain->tail->prev) { 679 spin_unlock_irqrestore(&chain->lock, flags); 680 pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE); 681 return -ENOMEM; 682 } 683 hwdescr = descr->hwdescr; 684 chain->head = descr->next; 685 686 descr->skb = skb; 687 hwdescr->buf_addr = buf; 688 hwdescr->buf_size = skb->len; 689 hwdescr->next_descr_addr = 0; 690 hwdescr->data_status = 0; 691 692 hwdescr->dmac_cmd_status = 693 SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL; 694 spin_unlock_irqrestore(&chain->lock, flags); 695 696 if (skb->ip_summed == CHECKSUM_PARTIAL) 697 switch (ip_hdr(skb)->protocol) { 698 case IPPROTO_TCP: 699 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP; 700 break; 701 case IPPROTO_UDP: 702 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP; 703 break; 704 } 705 706 /* Chain the bus address, so that the DMA engine finds this descr. */ 707 wmb(); 708 descr->prev->hwdescr->next_descr_addr = descr->bus_addr; 709 710 card->netdev->trans_start = jiffies; /* set netdev watchdog timer */ 711 return 0; 712} 713 714static int 715spider_net_set_low_watermark(struct spider_net_card *card) 716{ 717 struct spider_net_descr *descr = card->tx_chain.tail; 718 struct spider_net_hw_descr *hwdescr; 719 unsigned long flags; 720 int status; 721 int cnt=0; 722 int i; 723 724 /* Measure the length of the queue. Measurement does not 725 * need to be precise -- does not need a lock. */ 726 while (descr != card->tx_chain.head) { 727 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE; 728 if (status == SPIDER_NET_DESCR_NOT_IN_USE) 729 break; 730 descr = descr->next; 731 cnt++; 732 } 733 734 /* If TX queue is short, don't even bother with interrupts */ 735 if (cnt < card->tx_chain.num_desc/4) 736 return cnt; 737 738 /* Set low-watermark 3/4th's of the way into the queue. */ 739 descr = card->tx_chain.tail; 740 cnt = (cnt*3)/4; 741 for (i=0;i<cnt; i++) 742 descr = descr->next; 743 744 /* Set the new watermark, clear the old watermark */ 745 spin_lock_irqsave(&card->tx_chain.lock, flags); 746 descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG; 747 if (card->low_watermark && card->low_watermark != descr) { 748 hwdescr = card->low_watermark->hwdescr; 749 hwdescr->dmac_cmd_status = 750 hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG; 751 } 752 card->low_watermark = descr; 753 spin_unlock_irqrestore(&card->tx_chain.lock, flags); 754 return cnt; 755} 756 757/** 758 * spider_net_release_tx_chain - processes sent tx descriptors 759 * @card: adapter structure 760 * @brutal: if set, don't care about whether descriptor seems to be in use 761 * 762 * returns 0 if the tx ring is empty, otherwise 1. 763 * 764 * spider_net_release_tx_chain releases the tx descriptors that spider has 765 * finished with (if non-brutal) or simply release tx descriptors (if brutal). 766 * If some other context is calling this function, we return 1 so that we're 767 * scheduled again (if we were scheduled) and will not lose initiative. 768 */ 769static int 770spider_net_release_tx_chain(struct spider_net_card *card, int brutal) 771{ 772 struct net_device *dev = card->netdev; 773 struct spider_net_descr_chain *chain = &card->tx_chain; 774 struct spider_net_descr *descr; 775 struct spider_net_hw_descr *hwdescr; 776 struct sk_buff *skb; 777 u32 buf_addr; 778 unsigned long flags; 779 int status; 780 781 while (1) { 782 spin_lock_irqsave(&chain->lock, flags); 783 if (chain->tail == chain->head) { 784 spin_unlock_irqrestore(&chain->lock, flags); 785 return 0; 786 } 787 descr = chain->tail; 788 hwdescr = descr->hwdescr; 789 790 status = spider_net_get_descr_status(hwdescr); 791 switch (status) { 792 case SPIDER_NET_DESCR_COMPLETE: 793 dev->stats.tx_packets++; 794 dev->stats.tx_bytes += descr->skb->len; 795 break; 796 797 case SPIDER_NET_DESCR_CARDOWNED: 798 if (!brutal) { 799 spin_unlock_irqrestore(&chain->lock, flags); 800 return 1; 801 } 802 803 /* fallthrough, if we release the descriptors 804 * brutally (then we don't care about 805 * SPIDER_NET_DESCR_CARDOWNED) */ 806 807 case SPIDER_NET_DESCR_RESPONSE_ERROR: 808 case SPIDER_NET_DESCR_PROTECTION_ERROR: 809 case SPIDER_NET_DESCR_FORCE_END: 810 if (netif_msg_tx_err(card)) 811 dev_err(&card->netdev->dev, "forcing end of tx descriptor " 812 "with status x%02x\n", status); 813 dev->stats.tx_errors++; 814 break; 815 816 default: 817 dev->stats.tx_dropped++; 818 if (!brutal) { 819 spin_unlock_irqrestore(&chain->lock, flags); 820 return 1; 821 } 822 } 823 824 chain->tail = descr->next; 825 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE; 826 skb = descr->skb; 827 descr->skb = NULL; 828 buf_addr = hwdescr->buf_addr; 829 spin_unlock_irqrestore(&chain->lock, flags); 830 831 /* unmap the skb */ 832 if (skb) { 833 pci_unmap_single(card->pdev, buf_addr, skb->len, 834 PCI_DMA_TODEVICE); 835 dev_consume_skb_any(skb); 836 } 837 } 838 return 0; 839} 840 841/** 842 * spider_net_kick_tx_dma - enables TX DMA processing 843 * @card: card structure 844 * 845 * This routine will start the transmit DMA running if 846 * it is not already running. This routine ned only be 847 * called when queueing a new packet to an empty tx queue. 848 * Writes the current tx chain head as start address 849 * of the tx descriptor chain and enables the transmission 850 * DMA engine. 851 */ 852static inline void 853spider_net_kick_tx_dma(struct spider_net_card *card) 854{ 855 struct spider_net_descr *descr; 856 857 if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) & 858 SPIDER_NET_TX_DMA_EN) 859 goto out; 860 861 descr = card->tx_chain.tail; 862 for (;;) { 863 if (spider_net_get_descr_status(descr->hwdescr) == 864 SPIDER_NET_DESCR_CARDOWNED) { 865 spider_net_write_reg(card, SPIDER_NET_GDTDCHA, 866 descr->bus_addr); 867 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, 868 SPIDER_NET_DMA_TX_VALUE); 869 break; 870 } 871 if (descr == card->tx_chain.head) 872 break; 873 descr = descr->next; 874 } 875 876out: 877 mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER); 878} 879 880/** 881 * spider_net_xmit - transmits a frame over the device 882 * @skb: packet to send out 883 * @netdev: interface device structure 884 * 885 * returns 0 on success, !0 on failure 886 */ 887static int 888spider_net_xmit(struct sk_buff *skb, struct net_device *netdev) 889{ 890 int cnt; 891 struct spider_net_card *card = netdev_priv(netdev); 892 893 spider_net_release_tx_chain(card, 0); 894 895 if (spider_net_prepare_tx_descr(card, skb) != 0) { 896 netdev->stats.tx_dropped++; 897 netif_stop_queue(netdev); 898 return NETDEV_TX_BUSY; 899 } 900 901 cnt = spider_net_set_low_watermark(card); 902 if (cnt < 5) 903 spider_net_kick_tx_dma(card); 904 return NETDEV_TX_OK; 905} 906 907/** 908 * spider_net_cleanup_tx_ring - cleans up the TX ring 909 * @card: card structure 910 * 911 * spider_net_cleanup_tx_ring is called by either the tx_timer 912 * or from the NAPI polling routine. 913 * This routine releases resources associted with transmitted 914 * packets, including updating the queue tail pointer. 915 */ 916static void 917spider_net_cleanup_tx_ring(struct spider_net_card *card) 918{ 919 if ((spider_net_release_tx_chain(card, 0) != 0) && 920 (card->netdev->flags & IFF_UP)) { 921 spider_net_kick_tx_dma(card); 922 netif_wake_queue(card->netdev); 923 } 924} 925 926/** 927 * spider_net_do_ioctl - called for device ioctls 928 * @netdev: interface device structure 929 * @ifr: request parameter structure for ioctl 930 * @cmd: command code for ioctl 931 * 932 * returns 0 on success, <0 on failure. Currently, we have no special ioctls. 933 * -EOPNOTSUPP is returned, if an unknown ioctl was requested 934 */ 935static int 936spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) 937{ 938 switch (cmd) { 939 default: 940 return -EOPNOTSUPP; 941 } 942} 943 944/** 945 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on 946 * @descr: descriptor to process 947 * @card: card structure 948 * 949 * Fills out skb structure and passes the data to the stack. 950 * The descriptor state is not changed. 951 */ 952static void 953spider_net_pass_skb_up(struct spider_net_descr *descr, 954 struct spider_net_card *card) 955{ 956 struct spider_net_hw_descr *hwdescr = descr->hwdescr; 957 struct sk_buff *skb = descr->skb; 958 struct net_device *netdev = card->netdev; 959 u32 data_status = hwdescr->data_status; 960 u32 data_error = hwdescr->data_error; 961 962 skb_put(skb, hwdescr->valid_size); 963 964 /* the card seems to add 2 bytes of junk in front 965 * of the ethernet frame */ 966#define SPIDER_MISALIGN 2 967 skb_pull(skb, SPIDER_MISALIGN); 968 skb->protocol = eth_type_trans(skb, netdev); 969 970 /* checksum offload */ 971 skb_checksum_none_assert(skb); 972 if (netdev->features & NETIF_F_RXCSUM) { 973 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) == 974 SPIDER_NET_DATA_STATUS_CKSUM_MASK) && 975 !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK)) 976 skb->ip_summed = CHECKSUM_UNNECESSARY; 977 } 978 979 if (data_status & SPIDER_NET_VLAN_PACKET) { 980 /* further enhancements: HW-accel VLAN */ 981 } 982 983 /* update netdevice statistics */ 984 netdev->stats.rx_packets++; 985 netdev->stats.rx_bytes += skb->len; 986 987 /* pass skb up to stack */ 988 netif_receive_skb(skb); 989} 990 991static void show_rx_chain(struct spider_net_card *card) 992{ 993 struct spider_net_descr_chain *chain = &card->rx_chain; 994 struct spider_net_descr *start= chain->tail; 995 struct spider_net_descr *descr= start; 996 struct spider_net_hw_descr *hwd = start->hwdescr; 997 struct device *dev = &card->netdev->dev; 998 u32 curr_desc, next_desc; 999 int status; 1000 1001 int tot = 0; 1002 int cnt = 0; 1003 int off = start - chain->ring; 1004 int cstat = hwd->dmac_cmd_status; 1005 1006 dev_info(dev, "Total number of descrs=%d\n", 1007 chain->num_desc); 1008 dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n", 1009 off, cstat); 1010 1011 curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA); 1012 next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA); 1013 1014 status = cstat; 1015 do 1016 { 1017 hwd = descr->hwdescr; 1018 off = descr - chain->ring; 1019 status = hwd->dmac_cmd_status; 1020 1021 if (descr == chain->head) 1022 dev_info(dev, "Chain head is at %d, head status=0x%x\n", 1023 off, status); 1024 1025 if (curr_desc == descr->bus_addr) 1026 dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n", 1027 off, status); 1028 1029 if (next_desc == descr->bus_addr) 1030 dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n", 1031 off, status); 1032 1033 if (hwd->next_descr_addr == 0) 1034 dev_info(dev, "chain is cut at %d\n", off); 1035 1036 if (cstat != status) { 1037 int from = (chain->num_desc + off - cnt) % chain->num_desc; 1038 int to = (chain->num_desc + off - 1) % chain->num_desc; 1039 dev_info(dev, "Have %d (from %d to %d) descrs " 1040 "with stat=0x%08x\n", cnt, from, to, cstat); 1041 cstat = status; 1042 cnt = 0; 1043 } 1044 1045 cnt ++; 1046 tot ++; 1047 descr = descr->next; 1048 } while (descr != start); 1049 1050 dev_info(dev, "Last %d descrs with stat=0x%08x " 1051 "for a total of %d descrs\n", cnt, cstat, tot); 1052 1053#ifdef DEBUG 1054 /* Now dump the whole ring */ 1055 descr = start; 1056 do 1057 { 1058 struct spider_net_hw_descr *hwd = descr->hwdescr; 1059 status = spider_net_get_descr_status(hwd); 1060 cnt = descr - chain->ring; 1061 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n", 1062 cnt, status, descr->skb); 1063 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n", 1064 descr->bus_addr, hwd->buf_addr, hwd->buf_size); 1065 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n", 1066 hwd->next_descr_addr, hwd->result_size, 1067 hwd->valid_size); 1068 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n", 1069 hwd->dmac_cmd_status, hwd->data_status, 1070 hwd->data_error); 1071 dev_info(dev, "\n"); 1072 1073 descr = descr->next; 1074 } while (descr != start); 1075#endif 1076 1077} 1078 1079/** 1080 * spider_net_resync_head_ptr - Advance head ptr past empty descrs 1081 * 1082 * If the driver fails to keep up and empty the queue, then the 1083 * hardware wil run out of room to put incoming packets. This 1084 * will cause the hardware to skip descrs that are full (instead 1085 * of halting/retrying). Thus, once the driver runs, it wil need 1086 * to "catch up" to where the hardware chain pointer is at. 1087 */ 1088static void spider_net_resync_head_ptr(struct spider_net_card *card) 1089{ 1090 unsigned long flags; 1091 struct spider_net_descr_chain *chain = &card->rx_chain; 1092 struct spider_net_descr *descr; 1093 int i, status; 1094 1095 /* Advance head pointer past any empty descrs */ 1096 descr = chain->head; 1097 status = spider_net_get_descr_status(descr->hwdescr); 1098 1099 if (status == SPIDER_NET_DESCR_NOT_IN_USE) 1100 return; 1101 1102 spin_lock_irqsave(&chain->lock, flags); 1103 1104 descr = chain->head; 1105 status = spider_net_get_descr_status(descr->hwdescr); 1106 for (i=0; i<chain->num_desc; i++) { 1107 if (status != SPIDER_NET_DESCR_CARDOWNED) break; 1108 descr = descr->next; 1109 status = spider_net_get_descr_status(descr->hwdescr); 1110 } 1111 chain->head = descr; 1112 1113 spin_unlock_irqrestore(&chain->lock, flags); 1114} 1115 1116static int spider_net_resync_tail_ptr(struct spider_net_card *card) 1117{ 1118 struct spider_net_descr_chain *chain = &card->rx_chain; 1119 struct spider_net_descr *descr; 1120 int i, status; 1121 1122 /* Advance tail pointer past any empty and reaped descrs */ 1123 descr = chain->tail; 1124 status = spider_net_get_descr_status(descr->hwdescr); 1125 1126 for (i=0; i<chain->num_desc; i++) { 1127 if ((status != SPIDER_NET_DESCR_CARDOWNED) && 1128 (status != SPIDER_NET_DESCR_NOT_IN_USE)) break; 1129 descr = descr->next; 1130 status = spider_net_get_descr_status(descr->hwdescr); 1131 } 1132 chain->tail = descr; 1133 1134 if ((i == chain->num_desc) || (i == 0)) 1135 return 1; 1136 return 0; 1137} 1138 1139/** 1140 * spider_net_decode_one_descr - processes an RX descriptor 1141 * @card: card structure 1142 * 1143 * Returns 1 if a packet has been sent to the stack, otherwise 0. 1144 * 1145 * Processes an RX descriptor by iommu-unmapping the data buffer 1146 * and passing the packet up to the stack. This function is called 1147 * in softirq context, e.g. either bottom half from interrupt or 1148 * NAPI polling context. 1149 */ 1150static int 1151spider_net_decode_one_descr(struct spider_net_card *card) 1152{ 1153 struct net_device *dev = card->netdev; 1154 struct spider_net_descr_chain *chain = &card->rx_chain; 1155 struct spider_net_descr *descr = chain->tail; 1156 struct spider_net_hw_descr *hwdescr = descr->hwdescr; 1157 u32 hw_buf_addr; 1158 int status; 1159 1160 status = spider_net_get_descr_status(hwdescr); 1161 1162 /* Nothing in the descriptor, or ring must be empty */ 1163 if ((status == SPIDER_NET_DESCR_CARDOWNED) || 1164 (status == SPIDER_NET_DESCR_NOT_IN_USE)) 1165 return 0; 1166 1167 /* descriptor definitively used -- move on tail */ 1168 chain->tail = descr->next; 1169 1170 /* unmap descriptor */ 1171 hw_buf_addr = hwdescr->buf_addr; 1172 hwdescr->buf_addr = 0xffffffff; 1173 pci_unmap_single(card->pdev, hw_buf_addr, 1174 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE); 1175 1176 if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) || 1177 (status == SPIDER_NET_DESCR_PROTECTION_ERROR) || 1178 (status == SPIDER_NET_DESCR_FORCE_END) ) { 1179 if (netif_msg_rx_err(card)) 1180 dev_err(&dev->dev, 1181 "dropping RX descriptor with state %d\n", status); 1182 dev->stats.rx_dropped++; 1183 goto bad_desc; 1184 } 1185 1186 if ( (status != SPIDER_NET_DESCR_COMPLETE) && 1187 (status != SPIDER_NET_DESCR_FRAME_END) ) { 1188 if (netif_msg_rx_err(card)) 1189 dev_err(&card->netdev->dev, 1190 "RX descriptor with unknown state %d\n", status); 1191 card->spider_stats.rx_desc_unk_state++; 1192 goto bad_desc; 1193 } 1194 1195 /* The cases we'll throw away the packet immediately */ 1196 if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) { 1197 if (netif_msg_rx_err(card)) 1198 dev_err(&card->netdev->dev, 1199 "error in received descriptor found, " 1200 "data_status=x%08x, data_error=x%08x\n", 1201 hwdescr->data_status, hwdescr->data_error); 1202 goto bad_desc; 1203 } 1204 1205 if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) { 1206 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n", 1207 hwdescr->dmac_cmd_status); 1208 pr_err("buf_addr=x%08x\n", hw_buf_addr); 1209 pr_err("buf_size=x%08x\n", hwdescr->buf_size); 1210 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr); 1211 pr_err("result_size=x%08x\n", hwdescr->result_size); 1212 pr_err("valid_size=x%08x\n", hwdescr->valid_size); 1213 pr_err("data_status=x%08x\n", hwdescr->data_status); 1214 pr_err("data_error=x%08x\n", hwdescr->data_error); 1215 pr_err("which=%ld\n", descr - card->rx_chain.ring); 1216 1217 card->spider_stats.rx_desc_error++; 1218 goto bad_desc; 1219 } 1220 1221 /* Ok, we've got a packet in descr */ 1222 spider_net_pass_skb_up(descr, card); 1223 descr->skb = NULL; 1224 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 1225 return 1; 1226 1227bad_desc: 1228 if (netif_msg_rx_err(card)) 1229 show_rx_chain(card); 1230 dev_kfree_skb_irq(descr->skb); 1231 descr->skb = NULL; 1232 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 1233 return 0; 1234} 1235 1236/** 1237 * spider_net_poll - NAPI poll function called by the stack to return packets 1238 * @netdev: interface device structure 1239 * @budget: number of packets we can pass to the stack at most 1240 * 1241 * returns 0 if no more packets available to the driver/stack. Returns 1, 1242 * if the quota is exceeded, but the driver has still packets. 1243 * 1244 * spider_net_poll returns all packets from the rx descriptors to the stack 1245 * (using netif_receive_skb). If all/enough packets are up, the driver 1246 * reenables interrupts and returns 0. If not, 1 is returned. 1247 */ 1248static int spider_net_poll(struct napi_struct *napi, int budget) 1249{ 1250 struct spider_net_card *card = container_of(napi, struct spider_net_card, napi); 1251 int packets_done = 0; 1252 1253 while (packets_done < budget) { 1254 if (!spider_net_decode_one_descr(card)) 1255 break; 1256 1257 packets_done++; 1258 } 1259 1260 if ((packets_done == 0) && (card->num_rx_ints != 0)) { 1261 if (!spider_net_resync_tail_ptr(card)) 1262 packets_done = budget; 1263 spider_net_resync_head_ptr(card); 1264 } 1265 card->num_rx_ints = 0; 1266 1267 spider_net_refill_rx_chain(card); 1268 spider_net_enable_rxdmac(card); 1269 1270 spider_net_cleanup_tx_ring(card); 1271 1272 /* if all packets are in the stack, enable interrupts and return 0 */ 1273 /* if not, return 1 */ 1274 if (packets_done < budget) { 1275 napi_complete(napi); 1276 spider_net_rx_irq_on(card); 1277 card->ignore_rx_ramfull = 0; 1278 } 1279 1280 return packets_done; 1281} 1282 1283/** 1284 * spider_net_change_mtu - changes the MTU of an interface 1285 * @netdev: interface device structure 1286 * @new_mtu: new MTU value 1287 * 1288 * returns 0 on success, <0 on failure 1289 */ 1290static int 1291spider_net_change_mtu(struct net_device *netdev, int new_mtu) 1292{ 1293 /* no need to re-alloc skbs or so -- the max mtu is about 2.3k 1294 * and mtu is outbound only anyway */ 1295 if ( (new_mtu < SPIDER_NET_MIN_MTU ) || 1296 (new_mtu > SPIDER_NET_MAX_MTU) ) 1297 return -EINVAL; 1298 netdev->mtu = new_mtu; 1299 return 0; 1300} 1301 1302/** 1303 * spider_net_set_mac - sets the MAC of an interface 1304 * @netdev: interface device structure 1305 * @ptr: pointer to new MAC address 1306 * 1307 * Returns 0 on success, <0 on failure. Currently, we don't support this 1308 * and will always return EOPNOTSUPP. 1309 */ 1310static int 1311spider_net_set_mac(struct net_device *netdev, void *p) 1312{ 1313 struct spider_net_card *card = netdev_priv(netdev); 1314 u32 macl, macu, regvalue; 1315 struct sockaddr *addr = p; 1316 1317 if (!is_valid_ether_addr(addr->sa_data)) 1318 return -EADDRNOTAVAIL; 1319 1320 memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN); 1321 1322 /* switch off GMACTPE and GMACRPE */ 1323 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD); 1324 regvalue &= ~((1 << 5) | (1 << 6)); 1325 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue); 1326 1327 /* write mac */ 1328 macu = (netdev->dev_addr[0]<<24) + (netdev->dev_addr[1]<<16) + 1329 (netdev->dev_addr[2]<<8) + (netdev->dev_addr[3]); 1330 macl = (netdev->dev_addr[4]<<8) + (netdev->dev_addr[5]); 1331 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu); 1332 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl); 1333 1334 /* switch GMACTPE and GMACRPE back on */ 1335 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD); 1336 regvalue |= ((1 << 5) | (1 << 6)); 1337 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue); 1338 1339 spider_net_set_promisc(card); 1340 1341 return 0; 1342} 1343 1344/** 1345 * spider_net_link_reset 1346 * @netdev: net device structure 1347 * 1348 * This is called when the PHY_LINK signal is asserted. For the blade this is 1349 * not connected so we should never get here. 1350 * 1351 */ 1352static void 1353spider_net_link_reset(struct net_device *netdev) 1354{ 1355 1356 struct spider_net_card *card = netdev_priv(netdev); 1357 1358 del_timer_sync(&card->aneg_timer); 1359 1360 /* clear interrupt, block further interrupts */ 1361 spider_net_write_reg(card, SPIDER_NET_GMACST, 1362 spider_net_read_reg(card, SPIDER_NET_GMACST)); 1363 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0); 1364 1365 /* reset phy and setup aneg */ 1366 card->aneg_count = 0; 1367 card->medium = BCM54XX_COPPER; 1368 spider_net_setup_aneg(card); 1369 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 1370 1371} 1372 1373/** 1374 * spider_net_handle_error_irq - handles errors raised by an interrupt 1375 * @card: card structure 1376 * @status_reg: interrupt status register 0 (GHIINT0STS) 1377 * 1378 * spider_net_handle_error_irq treats or ignores all error conditions 1379 * found when an interrupt is presented 1380 */ 1381static void 1382spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg, 1383 u32 error_reg1, u32 error_reg2) 1384{ 1385 u32 i; 1386 int show_error = 1; 1387 1388 /* check GHIINT0STS ************************************/ 1389 if (status_reg) 1390 for (i = 0; i < 32; i++) 1391 if (status_reg & (1<<i)) 1392 switch (i) 1393 { 1394 /* let error_reg1 and error_reg2 evaluation decide, what to do 1395 case SPIDER_NET_PHYINT: 1396 case SPIDER_NET_GMAC2INT: 1397 case SPIDER_NET_GMAC1INT: 1398 case SPIDER_NET_GFIFOINT: 1399 case SPIDER_NET_DMACINT: 1400 case SPIDER_NET_GSYSINT: 1401 break; */ 1402 1403 case SPIDER_NET_GIPSINT: 1404 show_error = 0; 1405 break; 1406 1407 case SPIDER_NET_GPWOPCMPINT: 1408 /* PHY write operation completed */ 1409 show_error = 0; 1410 break; 1411 case SPIDER_NET_GPROPCMPINT: 1412 /* PHY read operation completed */ 1413 /* we don't use semaphores, as we poll for the completion 1414 * of the read operation in spider_net_read_phy. Should take 1415 * about 50 us */ 1416 show_error = 0; 1417 break; 1418 case SPIDER_NET_GPWFFINT: 1419 /* PHY command queue full */ 1420 if (netif_msg_intr(card)) 1421 dev_err(&card->netdev->dev, "PHY write queue full\n"); 1422 show_error = 0; 1423 break; 1424 1425 /* case SPIDER_NET_GRMDADRINT: not used. print a message */ 1426 /* case SPIDER_NET_GRMARPINT: not used. print a message */ 1427 /* case SPIDER_NET_GRMMPINT: not used. print a message */ 1428 1429 case SPIDER_NET_GDTDEN0INT: 1430 /* someone has set TX_DMA_EN to 0 */ 1431 show_error = 0; 1432 break; 1433 1434 case SPIDER_NET_GDDDEN0INT: /* fallthrough */ 1435 case SPIDER_NET_GDCDEN0INT: /* fallthrough */ 1436 case SPIDER_NET_GDBDEN0INT: /* fallthrough */ 1437 case SPIDER_NET_GDADEN0INT: 1438 /* someone has set RX_DMA_EN to 0 */ 1439 show_error = 0; 1440 break; 1441 1442 /* RX interrupts */ 1443 case SPIDER_NET_GDDFDCINT: 1444 case SPIDER_NET_GDCFDCINT: 1445 case SPIDER_NET_GDBFDCINT: 1446 case SPIDER_NET_GDAFDCINT: 1447 /* case SPIDER_NET_GDNMINT: not used. print a message */ 1448 /* case SPIDER_NET_GCNMINT: not used. print a message */ 1449 /* case SPIDER_NET_GBNMINT: not used. print a message */ 1450 /* case SPIDER_NET_GANMINT: not used. print a message */ 1451 /* case SPIDER_NET_GRFNMINT: not used. print a message */ 1452 show_error = 0; 1453 break; 1454 1455 /* TX interrupts */ 1456 case SPIDER_NET_GDTFDCINT: 1457 show_error = 0; 1458 break; 1459 case SPIDER_NET_GTTEDINT: 1460 show_error = 0; 1461 break; 1462 case SPIDER_NET_GDTDCEINT: 1463 /* chain end. If a descriptor should be sent, kick off 1464 * tx dma 1465 if (card->tx_chain.tail != card->tx_chain.head) 1466 spider_net_kick_tx_dma(card); 1467 */ 1468 show_error = 0; 1469 break; 1470 1471 /* case SPIDER_NET_G1TMCNTINT: not used. print a message */ 1472 /* case SPIDER_NET_GFREECNTINT: not used. print a message */ 1473 } 1474 1475 /* check GHIINT1STS ************************************/ 1476 if (error_reg1) 1477 for (i = 0; i < 32; i++) 1478 if (error_reg1 & (1<<i)) 1479 switch (i) 1480 { 1481 case SPIDER_NET_GTMFLLINT: 1482 /* TX RAM full may happen on a usual case. 1483 * Logging is not needed. */ 1484 show_error = 0; 1485 break; 1486 case SPIDER_NET_GRFDFLLINT: /* fallthrough */ 1487 case SPIDER_NET_GRFCFLLINT: /* fallthrough */ 1488 case SPIDER_NET_GRFBFLLINT: /* fallthrough */ 1489 case SPIDER_NET_GRFAFLLINT: /* fallthrough */ 1490 case SPIDER_NET_GRMFLLINT: 1491 /* Could happen when rx chain is full */ 1492 if (card->ignore_rx_ramfull == 0) { 1493 card->ignore_rx_ramfull = 1; 1494 spider_net_resync_head_ptr(card); 1495 spider_net_refill_rx_chain(card); 1496 spider_net_enable_rxdmac(card); 1497 card->num_rx_ints ++; 1498 napi_schedule(&card->napi); 1499 } 1500 show_error = 0; 1501 break; 1502 1503 /* case SPIDER_NET_GTMSHTINT: problem, print a message */ 1504 case SPIDER_NET_GDTINVDINT: 1505 /* allrighty. tx from previous descr ok */ 1506 show_error = 0; 1507 break; 1508 1509 /* chain end */ 1510 case SPIDER_NET_GDDDCEINT: /* fallthrough */ 1511 case SPIDER_NET_GDCDCEINT: /* fallthrough */ 1512 case SPIDER_NET_GDBDCEINT: /* fallthrough */ 1513 case SPIDER_NET_GDADCEINT: 1514 spider_net_resync_head_ptr(card); 1515 spider_net_refill_rx_chain(card); 1516 spider_net_enable_rxdmac(card); 1517 card->num_rx_ints ++; 1518 napi_schedule(&card->napi); 1519 show_error = 0; 1520 break; 1521 1522 /* invalid descriptor */ 1523 case SPIDER_NET_GDDINVDINT: /* fallthrough */ 1524 case SPIDER_NET_GDCINVDINT: /* fallthrough */ 1525 case SPIDER_NET_GDBINVDINT: /* fallthrough */ 1526 case SPIDER_NET_GDAINVDINT: 1527 /* Could happen when rx chain is full */ 1528 spider_net_resync_head_ptr(card); 1529 spider_net_refill_rx_chain(card); 1530 spider_net_enable_rxdmac(card); 1531 card->num_rx_ints ++; 1532 napi_schedule(&card->napi); 1533 show_error = 0; 1534 break; 1535 1536 /* case SPIDER_NET_GDTRSERINT: problem, print a message */ 1537 /* case SPIDER_NET_GDDRSERINT: problem, print a message */ 1538 /* case SPIDER_NET_GDCRSERINT: problem, print a message */ 1539 /* case SPIDER_NET_GDBRSERINT: problem, print a message */ 1540 /* case SPIDER_NET_GDARSERINT: problem, print a message */ 1541 /* case SPIDER_NET_GDSERINT: problem, print a message */ 1542 /* case SPIDER_NET_GDTPTERINT: problem, print a message */ 1543 /* case SPIDER_NET_GDDPTERINT: problem, print a message */ 1544 /* case SPIDER_NET_GDCPTERINT: problem, print a message */ 1545 /* case SPIDER_NET_GDBPTERINT: problem, print a message */ 1546 /* case SPIDER_NET_GDAPTERINT: problem, print a message */ 1547 default: 1548 show_error = 1; 1549 break; 1550 } 1551 1552 /* check GHIINT2STS ************************************/ 1553 if (error_reg2) 1554 for (i = 0; i < 32; i++) 1555 if (error_reg2 & (1<<i)) 1556 switch (i) 1557 { 1558 /* there is nothing we can (want to) do at this time. Log a 1559 * message, we can switch on and off the specific values later on 1560 case SPIDER_NET_GPROPERINT: 1561 case SPIDER_NET_GMCTCRSNGINT: 1562 case SPIDER_NET_GMCTLCOLINT: 1563 case SPIDER_NET_GMCTTMOTINT: 1564 case SPIDER_NET_GMCRCAERINT: 1565 case SPIDER_NET_GMCRCALERINT: 1566 case SPIDER_NET_GMCRALNERINT: 1567 case SPIDER_NET_GMCROVRINT: 1568 case SPIDER_NET_GMCRRNTINT: 1569 case SPIDER_NET_GMCRRXERINT: 1570 case SPIDER_NET_GTITCSERINT: 1571 case SPIDER_NET_GTIFMTERINT: 1572 case SPIDER_NET_GTIPKTRVKINT: 1573 case SPIDER_NET_GTISPINGINT: 1574 case SPIDER_NET_GTISADNGINT: 1575 case SPIDER_NET_GTISPDNGINT: 1576 case SPIDER_NET_GRIFMTERINT: 1577 case SPIDER_NET_GRIPKTRVKINT: 1578 case SPIDER_NET_GRISPINGINT: 1579 case SPIDER_NET_GRISADNGINT: 1580 case SPIDER_NET_GRISPDNGINT: 1581 break; 1582 */ 1583 default: 1584 break; 1585 } 1586 1587 if ((show_error) && (netif_msg_intr(card)) && net_ratelimit()) 1588 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, " 1589 "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n", 1590 status_reg, error_reg1, error_reg2); 1591 1592 /* clear interrupt sources */ 1593 spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1); 1594 spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2); 1595} 1596 1597/** 1598 * spider_net_interrupt - interrupt handler for spider_net 1599 * @irq: interrupt number 1600 * @ptr: pointer to net_device 1601 * 1602 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no 1603 * interrupt found raised by card. 1604 * 1605 * This is the interrupt handler, that turns off 1606 * interrupts for this device and makes the stack poll the driver 1607 */ 1608static irqreturn_t 1609spider_net_interrupt(int irq, void *ptr) 1610{ 1611 struct net_device *netdev = ptr; 1612 struct spider_net_card *card = netdev_priv(netdev); 1613 u32 status_reg, error_reg1, error_reg2; 1614 1615 status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS); 1616 error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS); 1617 error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS); 1618 1619 if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) && 1620 !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) && 1621 !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE)) 1622 return IRQ_NONE; 1623 1624 if (status_reg & SPIDER_NET_RXINT ) { 1625 spider_net_rx_irq_off(card); 1626 napi_schedule(&card->napi); 1627 card->num_rx_ints ++; 1628 } 1629 if (status_reg & SPIDER_NET_TXINT) 1630 napi_schedule(&card->napi); 1631 1632 if (status_reg & SPIDER_NET_LINKINT) 1633 spider_net_link_reset(netdev); 1634 1635 if (status_reg & SPIDER_NET_ERRINT ) 1636 spider_net_handle_error_irq(card, status_reg, 1637 error_reg1, error_reg2); 1638 1639 /* clear interrupt sources */ 1640 spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg); 1641 1642 return IRQ_HANDLED; 1643} 1644 1645#ifdef CONFIG_NET_POLL_CONTROLLER 1646/** 1647 * spider_net_poll_controller - artificial interrupt for netconsole etc. 1648 * @netdev: interface device structure 1649 * 1650 * see Documentation/networking/netconsole.txt 1651 */ 1652static void 1653spider_net_poll_controller(struct net_device *netdev) 1654{ 1655 disable_irq(netdev->irq); 1656 spider_net_interrupt(netdev->irq, netdev); 1657 enable_irq(netdev->irq); 1658} 1659#endif /* CONFIG_NET_POLL_CONTROLLER */ 1660 1661/** 1662 * spider_net_enable_interrupts - enable interrupts 1663 * @card: card structure 1664 * 1665 * spider_net_enable_interrupt enables several interrupts 1666 */ 1667static void 1668spider_net_enable_interrupts(struct spider_net_card *card) 1669{ 1670 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 1671 SPIDER_NET_INT0_MASK_VALUE); 1672 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 1673 SPIDER_NET_INT1_MASK_VALUE); 1674 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 1675 SPIDER_NET_INT2_MASK_VALUE); 1676} 1677 1678/** 1679 * spider_net_disable_interrupts - disable interrupts 1680 * @card: card structure 1681 * 1682 * spider_net_disable_interrupts disables all the interrupts 1683 */ 1684static void 1685spider_net_disable_interrupts(struct spider_net_card *card) 1686{ 1687 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0); 1688 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0); 1689 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0); 1690 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0); 1691} 1692 1693/** 1694 * spider_net_init_card - initializes the card 1695 * @card: card structure 1696 * 1697 * spider_net_init_card initializes the card so that other registers can 1698 * be used 1699 */ 1700static void 1701spider_net_init_card(struct spider_net_card *card) 1702{ 1703 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 1704 SPIDER_NET_CKRCTRL_STOP_VALUE); 1705 1706 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 1707 SPIDER_NET_CKRCTRL_RUN_VALUE); 1708 1709 /* trigger ETOMOD signal */ 1710 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, 1711 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4); 1712 1713 spider_net_disable_interrupts(card); 1714} 1715 1716/** 1717 * spider_net_enable_card - enables the card by setting all kinds of regs 1718 * @card: card structure 1719 * 1720 * spider_net_enable_card sets a lot of SMMIO registers to enable the device 1721 */ 1722static void 1723spider_net_enable_card(struct spider_net_card *card) 1724{ 1725 int i; 1726 /* the following array consists of (register),(value) pairs 1727 * that are set in this function. A register of 0 ends the list */ 1728 u32 regs[][2] = { 1729 { SPIDER_NET_GRESUMINTNUM, 0 }, 1730 { SPIDER_NET_GREINTNUM, 0 }, 1731 1732 /* set interrupt frame number registers */ 1733 /* clear the single DMA engine registers first */ 1734 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1735 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1736 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1737 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1738 /* then set, what we really need */ 1739 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE }, 1740 1741 /* timer counter registers and stuff */ 1742 { SPIDER_NET_GFREECNNUM, 0 }, 1743 { SPIDER_NET_GONETIMENUM, 0 }, 1744 { SPIDER_NET_GTOUTFRMNUM, 0 }, 1745 1746 /* RX mode setting */ 1747 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE }, 1748 /* TX mode setting */ 1749 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE }, 1750 /* IPSEC mode setting */ 1751 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE }, 1752 1753 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE }, 1754 1755 { SPIDER_NET_GMRWOLCTRL, 0 }, 1756 { SPIDER_NET_GTESTMD, 0x10000000 }, 1757 { SPIDER_NET_GTTQMSK, 0x00400040 }, 1758 1759 { SPIDER_NET_GMACINTEN, 0 }, 1760 1761 /* flow control stuff */ 1762 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE }, 1763 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE }, 1764 1765 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE }, 1766 { 0, 0} 1767 }; 1768 1769 i = 0; 1770 while (regs[i][0]) { 1771 spider_net_write_reg(card, regs[i][0], regs[i][1]); 1772 i++; 1773 } 1774 1775 /* clear unicast filter table entries 1 to 14 */ 1776 for (i = 1; i <= 14; i++) { 1777 spider_net_write_reg(card, 1778 SPIDER_NET_GMRUAFILnR + i * 8, 1779 0x00080000); 1780 spider_net_write_reg(card, 1781 SPIDER_NET_GMRUAFILnR + i * 8 + 4, 1782 0x00000000); 1783 } 1784 1785 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000); 1786 1787 spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE); 1788 1789 /* set chain tail address for RX chains and 1790 * enable DMA */ 1791 spider_net_enable_rxchtails(card); 1792 spider_net_enable_rxdmac(card); 1793 1794 spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE); 1795 1796 spider_net_write_reg(card, SPIDER_NET_GMACLENLMT, 1797 SPIDER_NET_LENLMT_VALUE); 1798 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, 1799 SPIDER_NET_OPMODE_VALUE); 1800 1801 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, 1802 SPIDER_NET_GDTBSTA); 1803} 1804 1805/** 1806 * spider_net_download_firmware - loads firmware into the adapter 1807 * @card: card structure 1808 * @firmware_ptr: pointer to firmware data 1809 * 1810 * spider_net_download_firmware loads the firmware data into the 1811 * adapter. It assumes the length etc. to be allright. 1812 */ 1813static int 1814spider_net_download_firmware(struct spider_net_card *card, 1815 const void *firmware_ptr) 1816{ 1817 int sequencer, i; 1818 const u32 *fw_ptr = firmware_ptr; 1819 1820 /* stop sequencers */ 1821 spider_net_write_reg(card, SPIDER_NET_GSINIT, 1822 SPIDER_NET_STOP_SEQ_VALUE); 1823 1824 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS; 1825 sequencer++) { 1826 spider_net_write_reg(card, 1827 SPIDER_NET_GSnPRGADR + sequencer * 8, 0); 1828 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) { 1829 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT + 1830 sequencer * 8, *fw_ptr); 1831 fw_ptr++; 1832 } 1833 } 1834 1835 if (spider_net_read_reg(card, SPIDER_NET_GSINIT)) 1836 return -EIO; 1837 1838 spider_net_write_reg(card, SPIDER_NET_GSINIT, 1839 SPIDER_NET_RUN_SEQ_VALUE); 1840 1841 return 0; 1842} 1843 1844/** 1845 * spider_net_init_firmware - reads in firmware parts 1846 * @card: card structure 1847 * 1848 * Returns 0 on success, <0 on failure 1849 * 1850 * spider_net_init_firmware opens the sequencer firmware and does some basic 1851 * checks. This function opens and releases the firmware structure. A call 1852 * to download the firmware is performed before the release. 1853 * 1854 * Firmware format 1855 * =============== 1856 * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being 1857 * the program for each sequencer. Use the command 1858 * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \ 1859 * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \ 1860 * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin 1861 * 1862 * to generate spider_fw.bin, if you have sequencer programs with something 1863 * like the following contents for each sequencer: 1864 * <ONE LINE COMMENT> 1865 * <FIRST 4-BYTES-WORD FOR SEQUENCER> 1866 * <SECOND 4-BYTES-WORD FOR SEQUENCER> 1867 * ... 1868 * <1024th 4-BYTES-WORD FOR SEQUENCER> 1869 */ 1870static int 1871spider_net_init_firmware(struct spider_net_card *card) 1872{ 1873 struct firmware *firmware = NULL; 1874 struct device_node *dn; 1875 const u8 *fw_prop = NULL; 1876 int err = -ENOENT; 1877 int fw_size; 1878 1879 if (request_firmware((const struct firmware **)&firmware, 1880 SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) { 1881 if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) && 1882 netif_msg_probe(card) ) { 1883 dev_err(&card->netdev->dev, 1884 "Incorrect size of spidernet firmware in " \ 1885 "filesystem. Looking in host firmware...\n"); 1886 goto try_host_fw; 1887 } 1888 err = spider_net_download_firmware(card, firmware->data); 1889 1890 release_firmware(firmware); 1891 if (err) 1892 goto try_host_fw; 1893 1894 goto done; 1895 } 1896 1897try_host_fw: 1898 dn = pci_device_to_OF_node(card->pdev); 1899 if (!dn) 1900 goto out_err; 1901 1902 fw_prop = of_get_property(dn, "firmware", &fw_size); 1903 if (!fw_prop) 1904 goto out_err; 1905 1906 if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) && 1907 netif_msg_probe(card) ) { 1908 dev_err(&card->netdev->dev, 1909 "Incorrect size of spidernet firmware in host firmware\n"); 1910 goto done; 1911 } 1912 1913 err = spider_net_download_firmware(card, fw_prop); 1914 1915done: 1916 return err; 1917out_err: 1918 if (netif_msg_probe(card)) 1919 dev_err(&card->netdev->dev, 1920 "Couldn't find spidernet firmware in filesystem " \ 1921 "or host firmware\n"); 1922 return err; 1923} 1924 1925/** 1926 * spider_net_open - called upon ifonfig up 1927 * @netdev: interface device structure 1928 * 1929 * returns 0 on success, <0 on failure 1930 * 1931 * spider_net_open allocates all the descriptors and memory needed for 1932 * operation, sets up multicast list and enables interrupts 1933 */ 1934int 1935spider_net_open(struct net_device *netdev) 1936{ 1937 struct spider_net_card *card = netdev_priv(netdev); 1938 int result; 1939 1940 result = spider_net_init_firmware(card); 1941 if (result) 1942 goto init_firmware_failed; 1943 1944 /* start probing with copper */ 1945 card->aneg_count = 0; 1946 card->medium = BCM54XX_COPPER; 1947 spider_net_setup_aneg(card); 1948 if (card->phy.def->phy_id) 1949 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 1950 1951 result = spider_net_init_chain(card, &card->tx_chain); 1952 if (result) 1953 goto alloc_tx_failed; 1954 card->low_watermark = NULL; 1955 1956 result = spider_net_init_chain(card, &card->rx_chain); 1957 if (result) 1958 goto alloc_rx_failed; 1959 1960 /* Allocate rx skbs */ 1961 result = spider_net_alloc_rx_skbs(card); 1962 if (result) 1963 goto alloc_skbs_failed; 1964 1965 spider_net_set_multi(netdev); 1966 1967 /* further enhancement: setup hw vlan, if needed */ 1968 1969 result = -EBUSY; 1970 if (request_irq(netdev->irq, spider_net_interrupt, 1971 IRQF_SHARED, netdev->name, netdev)) 1972 goto register_int_failed; 1973 1974 spider_net_enable_card(card); 1975 1976 netif_start_queue(netdev); 1977 netif_carrier_on(netdev); 1978 napi_enable(&card->napi); 1979 1980 spider_net_enable_interrupts(card); 1981 1982 return 0; 1983 1984register_int_failed: 1985 spider_net_free_rx_chain_contents(card); 1986alloc_skbs_failed: 1987 spider_net_free_chain(card, &card->rx_chain); 1988alloc_rx_failed: 1989 spider_net_free_chain(card, &card->tx_chain); 1990alloc_tx_failed: 1991 del_timer_sync(&card->aneg_timer); 1992init_firmware_failed: 1993 return result; 1994} 1995 1996/** 1997 * spider_net_link_phy 1998 * @data: used for pointer to card structure 1999 * 2000 */ 2001static void spider_net_link_phy(unsigned long data) 2002{ 2003 struct spider_net_card *card = (struct spider_net_card *)data; 2004 struct mii_phy *phy = &card->phy; 2005 2006 /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */ 2007 if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) { 2008 2009 pr_debug("%s: link is down trying to bring it up\n", 2010 card->netdev->name); 2011 2012 switch (card->medium) { 2013 case BCM54XX_COPPER: 2014 /* enable fiber with autonegotiation first */ 2015 if (phy->def->ops->enable_fiber) 2016 phy->def->ops->enable_fiber(phy, 1); 2017 card->medium = BCM54XX_FIBER; 2018 break; 2019 2020 case BCM54XX_FIBER: 2021 /* fiber didn't come up, try to disable fiber autoneg */ 2022 if (phy->def->ops->enable_fiber) 2023 phy->def->ops->enable_fiber(phy, 0); 2024 card->medium = BCM54XX_UNKNOWN; 2025 break; 2026 2027 case BCM54XX_UNKNOWN: 2028 /* copper, fiber with and without failed, 2029 * retry from beginning */ 2030 spider_net_setup_aneg(card); 2031 card->medium = BCM54XX_COPPER; 2032 break; 2033 } 2034 2035 card->aneg_count = 0; 2036 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 2037 return; 2038 } 2039 2040 /* link still not up, try again later */ 2041 if (!(phy->def->ops->poll_link(phy))) { 2042 card->aneg_count++; 2043 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 2044 return; 2045 } 2046 2047 /* link came up, get abilities */ 2048 phy->def->ops->read_link(phy); 2049 2050 spider_net_write_reg(card, SPIDER_NET_GMACST, 2051 spider_net_read_reg(card, SPIDER_NET_GMACST)); 2052 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4); 2053 2054 if (phy->speed == 1000) 2055 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001); 2056 else 2057 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0); 2058 2059 card->aneg_count = 0; 2060 2061 pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n", 2062 card->netdev->name, phy->speed, 2063 phy->duplex == 1 ? "Full" : "Half", 2064 phy->autoneg == 1 ? "" : "no "); 2065} 2066 2067/** 2068 * spider_net_setup_phy - setup PHY 2069 * @card: card structure 2070 * 2071 * returns 0 on success, <0 on failure 2072 * 2073 * spider_net_setup_phy is used as part of spider_net_probe. 2074 **/ 2075static int 2076spider_net_setup_phy(struct spider_net_card *card) 2077{ 2078 struct mii_phy *phy = &card->phy; 2079 2080 spider_net_write_reg(card, SPIDER_NET_GDTDMASEL, 2081 SPIDER_NET_DMASEL_VALUE); 2082 spider_net_write_reg(card, SPIDER_NET_GPCCTRL, 2083 SPIDER_NET_PHY_CTRL_VALUE); 2084 2085 phy->dev = card->netdev; 2086 phy->mdio_read = spider_net_read_phy; 2087 phy->mdio_write = spider_net_write_phy; 2088 2089 for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) { 2090 unsigned short id; 2091 id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR); 2092 if (id != 0x0000 && id != 0xffff) { 2093 if (!sungem_phy_probe(phy, phy->mii_id)) { 2094 pr_info("Found %s.\n", phy->def->name); 2095 break; 2096 } 2097 } 2098 } 2099 2100 return 0; 2101} 2102 2103/** 2104 * spider_net_workaround_rxramfull - work around firmware bug 2105 * @card: card structure 2106 * 2107 * no return value 2108 **/ 2109static void 2110spider_net_workaround_rxramfull(struct spider_net_card *card) 2111{ 2112 int i, sequencer = 0; 2113 2114 /* cancel reset */ 2115 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 2116 SPIDER_NET_CKRCTRL_RUN_VALUE); 2117 2118 /* empty sequencer data */ 2119 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS; 2120 sequencer++) { 2121 spider_net_write_reg(card, SPIDER_NET_GSnPRGADR + 2122 sequencer * 8, 0x0); 2123 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) { 2124 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT + 2125 sequencer * 8, 0x0); 2126 } 2127 } 2128 2129 /* set sequencer operation */ 2130 spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe); 2131 2132 /* reset */ 2133 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 2134 SPIDER_NET_CKRCTRL_STOP_VALUE); 2135} 2136 2137/** 2138 * spider_net_stop - called upon ifconfig down 2139 * @netdev: interface device structure 2140 * 2141 * always returns 0 2142 */ 2143int 2144spider_net_stop(struct net_device *netdev) 2145{ 2146 struct spider_net_card *card = netdev_priv(netdev); 2147 2148 napi_disable(&card->napi); 2149 netif_carrier_off(netdev); 2150 netif_stop_queue(netdev); 2151 del_timer_sync(&card->tx_timer); 2152 del_timer_sync(&card->aneg_timer); 2153 2154 spider_net_disable_interrupts(card); 2155 2156 free_irq(netdev->irq, netdev); 2157 2158 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, 2159 SPIDER_NET_DMA_TX_FEND_VALUE); 2160 2161 /* turn off DMA, force end */ 2162 spider_net_disable_rxdmac(card); 2163 2164 /* release chains */ 2165 spider_net_release_tx_chain(card, 1); 2166 spider_net_free_rx_chain_contents(card); 2167 2168 spider_net_free_chain(card, &card->tx_chain); 2169 spider_net_free_chain(card, &card->rx_chain); 2170 2171 return 0; 2172} 2173 2174/** 2175 * spider_net_tx_timeout_task - task scheduled by the watchdog timeout 2176 * function (to be called not under interrupt status) 2177 * @data: data, is interface device structure 2178 * 2179 * called as task when tx hangs, resets interface (if interface is up) 2180 */ 2181static void 2182spider_net_tx_timeout_task(struct work_struct *work) 2183{ 2184 struct spider_net_card *card = 2185 container_of(work, struct spider_net_card, tx_timeout_task); 2186 struct net_device *netdev = card->netdev; 2187 2188 if (!(netdev->flags & IFF_UP)) 2189 goto out; 2190 2191 netif_device_detach(netdev); 2192 spider_net_stop(netdev); 2193 2194 spider_net_workaround_rxramfull(card); 2195 spider_net_init_card(card); 2196 2197 if (spider_net_setup_phy(card)) 2198 goto out; 2199 2200 spider_net_open(netdev); 2201 spider_net_kick_tx_dma(card); 2202 netif_device_attach(netdev); 2203 2204out: 2205 atomic_dec(&card->tx_timeout_task_counter); 2206} 2207 2208/** 2209 * spider_net_tx_timeout - called when the tx timeout watchdog kicks in. 2210 * @netdev: interface device structure 2211 * 2212 * called, if tx hangs. Schedules a task that resets the interface 2213 */ 2214static void 2215spider_net_tx_timeout(struct net_device *netdev) 2216{ 2217 struct spider_net_card *card; 2218 2219 card = netdev_priv(netdev); 2220 atomic_inc(&card->tx_timeout_task_counter); 2221 if (netdev->flags & IFF_UP) 2222 schedule_work(&card->tx_timeout_task); 2223 else 2224 atomic_dec(&card->tx_timeout_task_counter); 2225 card->spider_stats.tx_timeouts++; 2226} 2227 2228static const struct net_device_ops spider_net_ops = { 2229 .ndo_open = spider_net_open, 2230 .ndo_stop = spider_net_stop, 2231 .ndo_start_xmit = spider_net_xmit, 2232 .ndo_set_rx_mode = spider_net_set_multi, 2233 .ndo_set_mac_address = spider_net_set_mac, 2234 .ndo_change_mtu = spider_net_change_mtu, 2235 .ndo_do_ioctl = spider_net_do_ioctl, 2236 .ndo_tx_timeout = spider_net_tx_timeout, 2237 .ndo_validate_addr = eth_validate_addr, 2238 /* HW VLAN */ 2239#ifdef CONFIG_NET_POLL_CONTROLLER 2240 /* poll controller */ 2241 .ndo_poll_controller = spider_net_poll_controller, 2242#endif /* CONFIG_NET_POLL_CONTROLLER */ 2243}; 2244 2245/** 2246 * spider_net_setup_netdev_ops - initialization of net_device operations 2247 * @netdev: net_device structure 2248 * 2249 * fills out function pointers in the net_device structure 2250 */ 2251static void 2252spider_net_setup_netdev_ops(struct net_device *netdev) 2253{ 2254 netdev->netdev_ops = &spider_net_ops; 2255 netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT; 2256 /* ethtool ops */ 2257 netdev->ethtool_ops = &spider_net_ethtool_ops; 2258} 2259 2260/** 2261 * spider_net_setup_netdev - initialization of net_device 2262 * @card: card structure 2263 * 2264 * Returns 0 on success or <0 on failure 2265 * 2266 * spider_net_setup_netdev initializes the net_device structure 2267 **/ 2268static int 2269spider_net_setup_netdev(struct spider_net_card *card) 2270{ 2271 int result; 2272 struct net_device *netdev = card->netdev; 2273 struct device_node *dn; 2274 struct sockaddr addr; 2275 const u8 *mac; 2276 2277 SET_NETDEV_DEV(netdev, &card->pdev->dev); 2278 2279 pci_set_drvdata(card->pdev, netdev); 2280 2281 init_timer(&card->tx_timer); 2282 card->tx_timer.function = 2283 (void (*)(unsigned long)) spider_net_cleanup_tx_ring; 2284 card->tx_timer.data = (unsigned long) card; 2285 netdev->irq = card->pdev->irq; 2286 2287 card->aneg_count = 0; 2288 init_timer(&card->aneg_timer); 2289 card->aneg_timer.function = spider_net_link_phy; 2290 card->aneg_timer.data = (unsigned long) card; 2291 2292 netif_napi_add(netdev, &card->napi, 2293 spider_net_poll, SPIDER_NET_NAPI_WEIGHT); 2294 2295 spider_net_setup_netdev_ops(netdev); 2296 2297 netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM; 2298 if (SPIDER_NET_RX_CSUM_DEFAULT) 2299 netdev->features |= NETIF_F_RXCSUM; 2300 netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX; 2301 /* some time: NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | 2302 * NETIF_F_HW_VLAN_CTAG_FILTER */ 2303 2304 netdev->irq = card->pdev->irq; 2305 card->num_rx_ints = 0; 2306 card->ignore_rx_ramfull = 0; 2307 2308 dn = pci_device_to_OF_node(card->pdev); 2309 if (!dn) 2310 return -EIO; 2311 2312 mac = of_get_property(dn, "local-mac-address", NULL); 2313 if (!mac) 2314 return -EIO; 2315 memcpy(addr.sa_data, mac, ETH_ALEN); 2316 2317 result = spider_net_set_mac(netdev, &addr); 2318 if ((result) && (netif_msg_probe(card))) 2319 dev_err(&card->netdev->dev, 2320 "Failed to set MAC address: %i\n", result); 2321 2322 result = register_netdev(netdev); 2323 if (result) { 2324 if (netif_msg_probe(card)) 2325 dev_err(&card->netdev->dev, 2326 "Couldn't register net_device: %i\n", result); 2327 return result; 2328 } 2329 2330 if (netif_msg_probe(card)) 2331 pr_info("Initialized device %s.\n", netdev->name); 2332 2333 return 0; 2334} 2335 2336/** 2337 * spider_net_alloc_card - allocates net_device and card structure 2338 * 2339 * returns the card structure or NULL in case of errors 2340 * 2341 * the card and net_device structures are linked to each other 2342 */ 2343static struct spider_net_card * 2344spider_net_alloc_card(void) 2345{ 2346 struct net_device *netdev; 2347 struct spider_net_card *card; 2348 size_t alloc_size; 2349 2350 alloc_size = sizeof(struct spider_net_card) + 2351 (tx_descriptors + rx_descriptors) * sizeof(struct spider_net_descr); 2352 netdev = alloc_etherdev(alloc_size); 2353 if (!netdev) 2354 return NULL; 2355 2356 card = netdev_priv(netdev); 2357 card->netdev = netdev; 2358 card->msg_enable = SPIDER_NET_DEFAULT_MSG; 2359 INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task); 2360 init_waitqueue_head(&card->waitq); 2361 atomic_set(&card->tx_timeout_task_counter, 0); 2362 2363 card->rx_chain.num_desc = rx_descriptors; 2364 card->rx_chain.ring = card->darray; 2365 card->tx_chain.num_desc = tx_descriptors; 2366 card->tx_chain.ring = card->darray + rx_descriptors; 2367 2368 return card; 2369} 2370 2371/** 2372 * spider_net_undo_pci_setup - releases PCI ressources 2373 * @card: card structure 2374 * 2375 * spider_net_undo_pci_setup releases the mapped regions 2376 */ 2377static void 2378spider_net_undo_pci_setup(struct spider_net_card *card) 2379{ 2380 iounmap(card->regs); 2381 pci_release_regions(card->pdev); 2382} 2383 2384/** 2385 * spider_net_setup_pci_dev - sets up the device in terms of PCI operations 2386 * @pdev: PCI device 2387 * 2388 * Returns the card structure or NULL if any errors occur 2389 * 2390 * spider_net_setup_pci_dev initializes pdev and together with the 2391 * functions called in spider_net_open configures the device so that 2392 * data can be transferred over it 2393 * The net_device structure is attached to the card structure, if the 2394 * function returns without error. 2395 **/ 2396static struct spider_net_card * 2397spider_net_setup_pci_dev(struct pci_dev *pdev) 2398{ 2399 struct spider_net_card *card; 2400 unsigned long mmio_start, mmio_len; 2401 2402 if (pci_enable_device(pdev)) { 2403 dev_err(&pdev->dev, "Couldn't enable PCI device\n"); 2404 return NULL; 2405 } 2406 2407 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) { 2408 dev_err(&pdev->dev, 2409 "Couldn't find proper PCI device base address.\n"); 2410 goto out_disable_dev; 2411 } 2412 2413 if (pci_request_regions(pdev, spider_net_driver_name)) { 2414 dev_err(&pdev->dev, 2415 "Couldn't obtain PCI resources, aborting.\n"); 2416 goto out_disable_dev; 2417 } 2418 2419 pci_set_master(pdev); 2420 2421 card = spider_net_alloc_card(); 2422 if (!card) { 2423 dev_err(&pdev->dev, 2424 "Couldn't allocate net_device structure, aborting.\n"); 2425 goto out_release_regions; 2426 } 2427 card->pdev = pdev; 2428 2429 /* fetch base address and length of first resource */ 2430 mmio_start = pci_resource_start(pdev, 0); 2431 mmio_len = pci_resource_len(pdev, 0); 2432 2433 card->netdev->mem_start = mmio_start; 2434 card->netdev->mem_end = mmio_start + mmio_len; 2435 card->regs = ioremap(mmio_start, mmio_len); 2436 2437 if (!card->regs) { 2438 dev_err(&pdev->dev, 2439 "Couldn't obtain PCI resources, aborting.\n"); 2440 goto out_release_regions; 2441 } 2442 2443 return card; 2444 2445out_release_regions: 2446 pci_release_regions(pdev); 2447out_disable_dev: 2448 pci_disable_device(pdev); 2449 return NULL; 2450} 2451 2452/** 2453 * spider_net_probe - initialization of a device 2454 * @pdev: PCI device 2455 * @ent: entry in the device id list 2456 * 2457 * Returns 0 on success, <0 on failure 2458 * 2459 * spider_net_probe initializes pdev and registers a net_device 2460 * structure for it. After that, the device can be ifconfig'ed up 2461 **/ 2462static int 2463spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 2464{ 2465 int err = -EIO; 2466 struct spider_net_card *card; 2467 2468 card = spider_net_setup_pci_dev(pdev); 2469 if (!card) 2470 goto out; 2471 2472 spider_net_workaround_rxramfull(card); 2473 spider_net_init_card(card); 2474 2475 err = spider_net_setup_phy(card); 2476 if (err) 2477 goto out_undo_pci; 2478 2479 err = spider_net_setup_netdev(card); 2480 if (err) 2481 goto out_undo_pci; 2482 2483 return 0; 2484 2485out_undo_pci: 2486 spider_net_undo_pci_setup(card); 2487 free_netdev(card->netdev); 2488out: 2489 return err; 2490} 2491 2492/** 2493 * spider_net_remove - removal of a device 2494 * @pdev: PCI device 2495 * 2496 * Returns 0 on success, <0 on failure 2497 * 2498 * spider_net_remove is called to remove the device and unregisters the 2499 * net_device 2500 **/ 2501static void 2502spider_net_remove(struct pci_dev *pdev) 2503{ 2504 struct net_device *netdev; 2505 struct spider_net_card *card; 2506 2507 netdev = pci_get_drvdata(pdev); 2508 card = netdev_priv(netdev); 2509 2510 wait_event(card->waitq, 2511 atomic_read(&card->tx_timeout_task_counter) == 0); 2512 2513 unregister_netdev(netdev); 2514 2515 /* switch off card */ 2516 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 2517 SPIDER_NET_CKRCTRL_STOP_VALUE); 2518 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 2519 SPIDER_NET_CKRCTRL_RUN_VALUE); 2520 2521 spider_net_undo_pci_setup(card); 2522 free_netdev(netdev); 2523} 2524 2525static struct pci_driver spider_net_driver = { 2526 .name = spider_net_driver_name, 2527 .id_table = spider_net_pci_tbl, 2528 .probe = spider_net_probe, 2529 .remove = spider_net_remove 2530}; 2531 2532/** 2533 * spider_net_init - init function when the driver is loaded 2534 * 2535 * spider_net_init registers the device driver 2536 */ 2537static int __init spider_net_init(void) 2538{ 2539 printk(KERN_INFO "Spidernet version %s.\n", VERSION); 2540 2541 if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) { 2542 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN; 2543 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors); 2544 } 2545 if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) { 2546 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX; 2547 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors); 2548 } 2549 if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) { 2550 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN; 2551 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors); 2552 } 2553 if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) { 2554 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX; 2555 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors); 2556 } 2557 2558 return pci_register_driver(&spider_net_driver); 2559} 2560 2561/** 2562 * spider_net_cleanup - exit function when driver is unloaded 2563 * 2564 * spider_net_cleanup unregisters the device driver 2565 */ 2566static void __exit spider_net_cleanup(void) 2567{ 2568 pci_unregister_driver(&spider_net_driver); 2569} 2570 2571module_init(spider_net_init); 2572module_exit(spider_net_cleanup); 2573