/drivers/net/ethernet/toshiba/spider_net.c
C | 2536 lines | 1534 code | 347 blank | 655 comment | 217 complexity | c7a54bf7689ad572b30378f10f09287f MD5 | raw file
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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 42MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \ 43 "<Jens.Osterkamp@de.ibm.com>"); 44MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver"); 45MODULE_LICENSE("GPL"); 46MODULE_VERSION(VERSION); 47MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME); 48 49static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT; 50static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT; 51 52module_param(rx_descriptors, int, 0444); 53module_param(tx_descriptors, int, 0444); 54 55MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \ 56 "in rx chains"); 57MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \ 58 "in tx chain"); 59 60char spider_net_driver_name[] = "spidernet"; 61 62static 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 68MODULE_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 */ 77static inline u32 78spider_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 */ 93static inline void 94spider_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 **/ 114static void 115spider_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 **/ 138static int 139spider_net_read_phy(struct net_device *netdev, int mii_id, int reg) 140{ 141 struct spider_net_card *card = netdev_priv(netdev); 142 u32 readvalue; 143 144 readvalue = ((u32)mii_id << 21) | ((u32)reg << 16); 145 spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue); 146 147 /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT 148 * interrupt, as we poll for the completion of the read operation 149 * in spider_net_read_phy. Should take about 50 us */ 150 do { 151 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD); 152 } while (readvalue & SPIDER_NET_GPREXEC); 153 154 readvalue &= SPIDER_NET_GPRDAT_MASK; 155 156 return readvalue; 157} 158 159/** 160 * spider_net_setup_aneg - initial auto-negotiation setup 161 * @card: device structure 162 **/ 163static void 164spider_net_setup_aneg(struct spider_net_card *card) 165{ 166 struct mii_phy *phy = &card->phy; 167 u32 advertise = 0; 168 u16 bmsr, estat; 169 170 bmsr = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR); 171 estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS); 172 173 if (bmsr & BMSR_10HALF) 174 advertise |= ADVERTISED_10baseT_Half; 175 if (bmsr & BMSR_10FULL) 176 advertise |= ADVERTISED_10baseT_Full; 177 if (bmsr & BMSR_100HALF) 178 advertise |= ADVERTISED_100baseT_Half; 179 if (bmsr & BMSR_100FULL) 180 advertise |= ADVERTISED_100baseT_Full; 181 182 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL)) 183 advertise |= SUPPORTED_1000baseT_Full; 184 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF)) 185 advertise |= SUPPORTED_1000baseT_Half; 186 187 sungem_phy_probe(phy, phy->mii_id); 188 phy->def->ops->setup_aneg(phy, advertise); 189 190} 191 192/** 193 * spider_net_rx_irq_off - switch off rx irq on this spider card 194 * @card: device structure 195 * 196 * switches off rx irq by masking them out in the GHIINTnMSK register 197 */ 198static void 199spider_net_rx_irq_off(struct spider_net_card *card) 200{ 201 u32 regvalue; 202 203 regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT); 204 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue); 205} 206 207/** 208 * spider_net_rx_irq_on - switch on rx irq on this spider card 209 * @card: device structure 210 * 211 * switches on rx irq by enabling them in the GHIINTnMSK register 212 */ 213static void 214spider_net_rx_irq_on(struct spider_net_card *card) 215{ 216 u32 regvalue; 217 218 regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT; 219 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue); 220} 221 222/** 223 * spider_net_set_promisc - sets the unicast address or the promiscuous mode 224 * @card: card structure 225 * 226 * spider_net_set_promisc sets the unicast destination address filter and 227 * thus either allows for non-promisc mode or promisc mode 228 */ 229static void 230spider_net_set_promisc(struct spider_net_card *card) 231{ 232 u32 macu, macl; 233 struct net_device *netdev = card->netdev; 234 235 if (netdev->flags & IFF_PROMISC) { 236 /* clear destination entry 0 */ 237 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0); 238 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0); 239 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 240 SPIDER_NET_PROMISC_VALUE); 241 } else { 242 macu = netdev->dev_addr[0]; 243 macu <<= 8; 244 macu |= netdev->dev_addr[1]; 245 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl)); 246 247 macu |= SPIDER_NET_UA_DESCR_VALUE; 248 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu); 249 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl); 250 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 251 SPIDER_NET_NONPROMISC_VALUE); 252 } 253} 254 255/** 256 * spider_net_get_descr_status -- returns the status of a descriptor 257 * @descr: descriptor to look at 258 * 259 * returns the status as in the dmac_cmd_status field of the descriptor 260 */ 261static inline int 262spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr) 263{ 264 return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK; 265} 266 267/** 268 * spider_net_free_chain - free descriptor chain 269 * @card: card structure 270 * @chain: address of chain 271 * 272 */ 273static void 274spider_net_free_chain(struct spider_net_card *card, 275 struct spider_net_descr_chain *chain) 276{ 277 struct spider_net_descr *descr; 278 279 descr = chain->ring; 280 do { 281 descr->bus_addr = 0; 282 descr->hwdescr->next_descr_addr = 0; 283 descr = descr->next; 284 } while (descr != chain->ring); 285 286 dma_free_coherent(&card->pdev->dev, chain->num_desc, 287 chain->hwring, chain->dma_addr); 288} 289 290/** 291 * spider_net_init_chain - alloc and link descriptor chain 292 * @card: card structure 293 * @chain: address of chain 294 * 295 * We manage a circular list that mirrors the hardware structure, 296 * except that the hardware uses bus addresses. 297 * 298 * Returns 0 on success, <0 on failure 299 */ 300static int 301spider_net_init_chain(struct spider_net_card *card, 302 struct spider_net_descr_chain *chain) 303{ 304 int i; 305 struct spider_net_descr *descr; 306 struct spider_net_hw_descr *hwdescr; 307 dma_addr_t buf; 308 size_t alloc_size; 309 310 alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr); 311 312 chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size, 313 &chain->dma_addr, GFP_KERNEL); 314 if (!chain->hwring) 315 return -ENOMEM; 316 317 memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr)); 318 319 /* Set up the hardware pointers in each descriptor */ 320 descr = chain->ring; 321 hwdescr = chain->hwring; 322 buf = chain->dma_addr; 323 for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) { 324 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 325 hwdescr->next_descr_addr = 0; 326 327 descr->hwdescr = hwdescr; 328 descr->bus_addr = buf; 329 descr->next = descr + 1; 330 descr->prev = descr - 1; 331 332 buf += sizeof(struct spider_net_hw_descr); 333 } 334 /* do actual circular list */ 335 (descr-1)->next = chain->ring; 336 chain->ring->prev = descr-1; 337 338 spin_lock_init(&chain->lock); 339 chain->head = chain->ring; 340 chain->tail = chain->ring; 341 return 0; 342} 343 344/** 345 * spider_net_free_rx_chain_contents - frees descr contents in rx chain 346 * @card: card structure 347 * 348 * returns 0 on success, <0 on failure 349 */ 350static void 351spider_net_free_rx_chain_contents(struct spider_net_card *card) 352{ 353 struct spider_net_descr *descr; 354 355 descr = card->rx_chain.head; 356 do { 357 if (descr->skb) { 358 pci_unmap_single(card->pdev, descr->hwdescr->buf_addr, 359 SPIDER_NET_MAX_FRAME, 360 PCI_DMA_BIDIRECTIONAL); 361 dev_kfree_skb(descr->skb); 362 descr->skb = NULL; 363 } 364 descr = descr->next; 365 } while (descr != card->rx_chain.head); 366} 367 368/** 369 * spider_net_prepare_rx_descr - Reinitialize RX descriptor 370 * @card: card structure 371 * @descr: descriptor to re-init 372 * 373 * Return 0 on success, <0 on failure. 374 * 375 * Allocates a new rx skb, iommu-maps it and attaches it to the 376 * descriptor. Mark the descriptor as activated, ready-to-use. 377 */ 378static int 379spider_net_prepare_rx_descr(struct spider_net_card *card, 380 struct spider_net_descr *descr) 381{ 382 struct spider_net_hw_descr *hwdescr = descr->hwdescr; 383 dma_addr_t buf; 384 int offset; 385 int bufsize; 386 387 /* we need to round up the buffer size to a multiple of 128 */ 388 bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) & 389 (~(SPIDER_NET_RXBUF_ALIGN - 1)); 390 391 /* and we need to have it 128 byte aligned, therefore we allocate a 392 * bit more */ 393 /* allocate an skb */ 394 descr->skb = netdev_alloc_skb(card->netdev, 395 bufsize + SPIDER_NET_RXBUF_ALIGN - 1); 396 if (!descr->skb) { 397 if (netif_msg_rx_err(card) && net_ratelimit()) 398 dev_err(&card->netdev->dev, 399 "Not enough memory to allocate rx buffer\n"); 400 card->spider_stats.alloc_rx_skb_error++; 401 return -ENOMEM; 402 } 403 hwdescr->buf_size = bufsize; 404 hwdescr->result_size = 0; 405 hwdescr->valid_size = 0; 406 hwdescr->data_status = 0; 407 hwdescr->data_error = 0; 408 409 offset = ((unsigned long)descr->skb->data) & 410 (SPIDER_NET_RXBUF_ALIGN - 1); 411 if (offset) 412 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset); 413 /* iommu-map the skb */ 414 buf = pci_map_single(card->pdev, descr->skb->data, 415 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE); 416 if (pci_dma_mapping_error(card->pdev, buf)) { 417 dev_kfree_skb_any(descr->skb); 418 descr->skb = NULL; 419 if (netif_msg_rx_err(card) && net_ratelimit()) 420 dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n"); 421 card->spider_stats.rx_iommu_map_error++; 422 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 423 } else { 424 hwdescr->buf_addr = buf; 425 wmb(); 426 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED | 427 SPIDER_NET_DMAC_NOINTR_COMPLETE; 428 } 429 430 return 0; 431} 432 433/** 434 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses 435 * @card: card structure 436 * 437 * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the 438 * chip by writing to the appropriate register. DMA is enabled in 439 * spider_net_enable_rxdmac. 440 */ 441static inline void 442spider_net_enable_rxchtails(struct spider_net_card *card) 443{ 444 /* assume chain is aligned correctly */ 445 spider_net_write_reg(card, SPIDER_NET_GDADCHA , 446 card->rx_chain.tail->bus_addr); 447} 448 449/** 450 * spider_net_enable_rxdmac - enables a receive DMA controller 451 * @card: card structure 452 * 453 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN 454 * in the GDADMACCNTR register 455 */ 456static inline void 457spider_net_enable_rxdmac(struct spider_net_card *card) 458{ 459 wmb(); 460 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR, 461 SPIDER_NET_DMA_RX_VALUE); 462} 463 464/** 465 * spider_net_disable_rxdmac - disables the receive DMA controller 466 * @card: card structure 467 * 468 * spider_net_disable_rxdmac terminates processing on the DMA controller 469 * by turing off the DMA controller, with the force-end flag set. 470 */ 471static inline void 472spider_net_disable_rxdmac(struct spider_net_card *card) 473{ 474 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR, 475 SPIDER_NET_DMA_RX_FEND_VALUE); 476} 477 478/** 479 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains 480 * @card: card structure 481 * 482 * refills descriptors in the rx chain: allocates skbs and iommu-maps them. 483 */ 484static void 485spider_net_refill_rx_chain(struct spider_net_card *card) 486{ 487 struct spider_net_descr_chain *chain = &card->rx_chain; 488 unsigned long flags; 489 490 /* one context doing the refill (and a second context seeing that 491 * and omitting it) is ok. If called by NAPI, we'll be called again 492 * as spider_net_decode_one_descr is called several times. If some 493 * interrupt calls us, the NAPI is about to clean up anyway. */ 494 if (!spin_trylock_irqsave(&chain->lock, flags)) 495 return; 496 497 while (spider_net_get_descr_status(chain->head->hwdescr) == 498 SPIDER_NET_DESCR_NOT_IN_USE) { 499 if (spider_net_prepare_rx_descr(card, chain->head)) 500 break; 501 chain->head = chain->head->next; 502 } 503 504 spin_unlock_irqrestore(&chain->lock, flags); 505} 506 507/** 508 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains 509 * @card: card structure 510 * 511 * Returns 0 on success, <0 on failure. 512 */ 513static int 514spider_net_alloc_rx_skbs(struct spider_net_card *card) 515{ 516 struct spider_net_descr_chain *chain = &card->rx_chain; 517 struct spider_net_descr *start = chain->tail; 518 struct spider_net_descr *descr = start; 519 520 /* Link up the hardware chain pointers */ 521 do { 522 descr->prev->hwdescr->next_descr_addr = descr->bus_addr; 523 descr = descr->next; 524 } while (descr != start); 525 526 /* Put at least one buffer into the chain. if this fails, 527 * we've got a problem. If not, spider_net_refill_rx_chain 528 * will do the rest at the end of this function. */ 529 if (spider_net_prepare_rx_descr(card, chain->head)) 530 goto error; 531 else 532 chain->head = chain->head->next; 533 534 /* This will allocate the rest of the rx buffers; 535 * if not, it's business as usual later on. */ 536 spider_net_refill_rx_chain(card); 537 spider_net_enable_rxdmac(card); 538 return 0; 539 540error: 541 spider_net_free_rx_chain_contents(card); 542 return -ENOMEM; 543} 544 545/** 546 * spider_net_get_multicast_hash - generates hash for multicast filter table 547 * @addr: multicast address 548 * 549 * returns the hash value. 550 * 551 * spider_net_get_multicast_hash calculates a hash value for a given multicast 552 * address, that is used to set the multicast filter tables 553 */ 554static u8 555spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr) 556{ 557 u32 crc; 558 u8 hash; 559 char addr_for_crc[ETH_ALEN] = { 0, }; 560 int i, bit; 561 562 for (i = 0; i < ETH_ALEN * 8; i++) { 563 bit = (addr[i / 8] >> (i % 8)) & 1; 564 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8)); 565 } 566 567 crc = crc32_be(~0, addr_for_crc, netdev->addr_len); 568 569 hash = (crc >> 27); 570 hash <<= 3; 571 hash |= crc & 7; 572 hash &= 0xff; 573 574 return hash; 575} 576 577/** 578 * spider_net_set_multi - sets multicast addresses and promisc flags 579 * @netdev: interface device structure 580 * 581 * spider_net_set_multi configures multicast addresses as needed for the 582 * netdev interface. It also sets up multicast, allmulti and promisc 583 * flags appropriately 584 */ 585static void 586spider_net_set_multi(struct net_device *netdev) 587{ 588 struct netdev_hw_addr *ha; 589 u8 hash; 590 int i; 591 u32 reg; 592 struct spider_net_card *card = netdev_priv(netdev); 593 DECLARE_BITMAP(bitmask, SPIDER_NET_MULTICAST_HASHES) = {}; 594 595 spider_net_set_promisc(card); 596 597 if (netdev->flags & IFF_ALLMULTI) { 598 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) { 599 set_bit(i, bitmask); 600 } 601 goto write_hash; 602 } 603 604 /* well, we know, what the broadcast hash value is: it's xfd 605 hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */ 606 set_bit(0xfd, bitmask); 607 608 netdev_for_each_mc_addr(ha, netdev) { 609 hash = spider_net_get_multicast_hash(netdev, ha->addr); 610 set_bit(hash, bitmask); 611 } 612 613write_hash: 614 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) { 615 reg = 0; 616 if (test_bit(i * 4, bitmask)) 617 reg += 0x08; 618 reg <<= 8; 619 if (test_bit(i * 4 + 1, bitmask)) 620 reg += 0x08; 621 reg <<= 8; 622 if (test_bit(i * 4 + 2, bitmask)) 623 reg += 0x08; 624 reg <<= 8; 625 if (test_bit(i * 4 + 3, bitmask)) 626 reg += 0x08; 627 628 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg); 629 } 630} 631 632/** 633 * spider_net_prepare_tx_descr - fill tx descriptor with skb data 634 * @card: card structure 635 * @skb: packet to use 636 * 637 * returns 0 on success, <0 on failure. 638 * 639 * fills out the descriptor structure with skb data and len. Copies data, 640 * if needed (32bit DMA!) 641 */ 642static int 643spider_net_prepare_tx_descr(struct spider_net_card *card, 644 struct sk_buff *skb) 645{ 646 struct spider_net_descr_chain *chain = &card->tx_chain; 647 struct spider_net_descr *descr; 648 struct spider_net_hw_descr *hwdescr; 649 dma_addr_t buf; 650 unsigned long flags; 651 652 buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE); 653 if (pci_dma_mapping_error(card->pdev, buf)) { 654 if (netif_msg_tx_err(card) && net_ratelimit()) 655 dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). " 656 "Dropping packet\n", skb->data, skb->len); 657 card->spider_stats.tx_iommu_map_error++; 658 return -ENOMEM; 659 } 660 661 spin_lock_irqsave(&chain->lock, flags); 662 descr = card->tx_chain.head; 663 if (descr->next == chain->tail->prev) { 664 spin_unlock_irqrestore(&chain->lock, flags); 665 pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE); 666 return -ENOMEM; 667 } 668 hwdescr = descr->hwdescr; 669 chain->head = descr->next; 670 671 descr->skb = skb; 672 hwdescr->buf_addr = buf; 673 hwdescr->buf_size = skb->len; 674 hwdescr->next_descr_addr = 0; 675 hwdescr->data_status = 0; 676 677 hwdescr->dmac_cmd_status = 678 SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL; 679 spin_unlock_irqrestore(&chain->lock, flags); 680 681 if (skb->ip_summed == CHECKSUM_PARTIAL) 682 switch (ip_hdr(skb)->protocol) { 683 case IPPROTO_TCP: 684 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP; 685 break; 686 case IPPROTO_UDP: 687 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP; 688 break; 689 } 690 691 /* Chain the bus address, so that the DMA engine finds this descr. */ 692 wmb(); 693 descr->prev->hwdescr->next_descr_addr = descr->bus_addr; 694 695 netif_trans_update(card->netdev); /* set netdev watchdog timer */ 696 return 0; 697} 698 699static int 700spider_net_set_low_watermark(struct spider_net_card *card) 701{ 702 struct spider_net_descr *descr = card->tx_chain.tail; 703 struct spider_net_hw_descr *hwdescr; 704 unsigned long flags; 705 int status; 706 int cnt=0; 707 int i; 708 709 /* Measure the length of the queue. Measurement does not 710 * need to be precise -- does not need a lock. */ 711 while (descr != card->tx_chain.head) { 712 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE; 713 if (status == SPIDER_NET_DESCR_NOT_IN_USE) 714 break; 715 descr = descr->next; 716 cnt++; 717 } 718 719 /* If TX queue is short, don't even bother with interrupts */ 720 if (cnt < card->tx_chain.num_desc/4) 721 return cnt; 722 723 /* Set low-watermark 3/4th's of the way into the queue. */ 724 descr = card->tx_chain.tail; 725 cnt = (cnt*3)/4; 726 for (i=0;i<cnt; i++) 727 descr = descr->next; 728 729 /* Set the new watermark, clear the old watermark */ 730 spin_lock_irqsave(&card->tx_chain.lock, flags); 731 descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG; 732 if (card->low_watermark && card->low_watermark != descr) { 733 hwdescr = card->low_watermark->hwdescr; 734 hwdescr->dmac_cmd_status = 735 hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG; 736 } 737 card->low_watermark = descr; 738 spin_unlock_irqrestore(&card->tx_chain.lock, flags); 739 return cnt; 740} 741 742/** 743 * spider_net_release_tx_chain - processes sent tx descriptors 744 * @card: adapter structure 745 * @brutal: if set, don't care about whether descriptor seems to be in use 746 * 747 * returns 0 if the tx ring is empty, otherwise 1. 748 * 749 * spider_net_release_tx_chain releases the tx descriptors that spider has 750 * finished with (if non-brutal) or simply release tx descriptors (if brutal). 751 * If some other context is calling this function, we return 1 so that we're 752 * scheduled again (if we were scheduled) and will not lose initiative. 753 */ 754static int 755spider_net_release_tx_chain(struct spider_net_card *card, int brutal) 756{ 757 struct net_device *dev = card->netdev; 758 struct spider_net_descr_chain *chain = &card->tx_chain; 759 struct spider_net_descr *descr; 760 struct spider_net_hw_descr *hwdescr; 761 struct sk_buff *skb; 762 u32 buf_addr; 763 unsigned long flags; 764 int status; 765 766 while (1) { 767 spin_lock_irqsave(&chain->lock, flags); 768 if (chain->tail == chain->head) { 769 spin_unlock_irqrestore(&chain->lock, flags); 770 return 0; 771 } 772 descr = chain->tail; 773 hwdescr = descr->hwdescr; 774 775 status = spider_net_get_descr_status(hwdescr); 776 switch (status) { 777 case SPIDER_NET_DESCR_COMPLETE: 778 dev->stats.tx_packets++; 779 dev->stats.tx_bytes += descr->skb->len; 780 break; 781 782 case SPIDER_NET_DESCR_CARDOWNED: 783 if (!brutal) { 784 spin_unlock_irqrestore(&chain->lock, flags); 785 return 1; 786 } 787 788 /* fallthrough, if we release the descriptors 789 * brutally (then we don't care about 790 * SPIDER_NET_DESCR_CARDOWNED) */ 791 /* Fall through */ 792 793 case SPIDER_NET_DESCR_RESPONSE_ERROR: 794 case SPIDER_NET_DESCR_PROTECTION_ERROR: 795 case SPIDER_NET_DESCR_FORCE_END: 796 if (netif_msg_tx_err(card)) 797 dev_err(&card->netdev->dev, "forcing end of tx descriptor " 798 "with status x%02x\n", status); 799 dev->stats.tx_errors++; 800 break; 801 802 default: 803 dev->stats.tx_dropped++; 804 if (!brutal) { 805 spin_unlock_irqrestore(&chain->lock, flags); 806 return 1; 807 } 808 } 809 810 chain->tail = descr->next; 811 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE; 812 skb = descr->skb; 813 descr->skb = NULL; 814 buf_addr = hwdescr->buf_addr; 815 spin_unlock_irqrestore(&chain->lock, flags); 816 817 /* unmap the skb */ 818 if (skb) { 819 pci_unmap_single(card->pdev, buf_addr, skb->len, 820 PCI_DMA_TODEVICE); 821 dev_consume_skb_any(skb); 822 } 823 } 824 return 0; 825} 826 827/** 828 * spider_net_kick_tx_dma - enables TX DMA processing 829 * @card: card structure 830 * 831 * This routine will start the transmit DMA running if 832 * it is not already running. This routine ned only be 833 * called when queueing a new packet to an empty tx queue. 834 * Writes the current tx chain head as start address 835 * of the tx descriptor chain and enables the transmission 836 * DMA engine. 837 */ 838static inline void 839spider_net_kick_tx_dma(struct spider_net_card *card) 840{ 841 struct spider_net_descr *descr; 842 843 if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) & 844 SPIDER_NET_TX_DMA_EN) 845 goto out; 846 847 descr = card->tx_chain.tail; 848 for (;;) { 849 if (spider_net_get_descr_status(descr->hwdescr) == 850 SPIDER_NET_DESCR_CARDOWNED) { 851 spider_net_write_reg(card, SPIDER_NET_GDTDCHA, 852 descr->bus_addr); 853 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR, 854 SPIDER_NET_DMA_TX_VALUE); 855 break; 856 } 857 if (descr == card->tx_chain.head) 858 break; 859 descr = descr->next; 860 } 861 862out: 863 mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER); 864} 865 866/** 867 * spider_net_xmit - transmits a frame over the device 868 * @skb: packet to send out 869 * @netdev: interface device structure 870 * 871 * returns NETDEV_TX_OK on success, NETDEV_TX_BUSY on failure 872 */ 873static netdev_tx_t 874spider_net_xmit(struct sk_buff *skb, struct net_device *netdev) 875{ 876 int cnt; 877 struct spider_net_card *card = netdev_priv(netdev); 878 879 spider_net_release_tx_chain(card, 0); 880 881 if (spider_net_prepare_tx_descr(card, skb) != 0) { 882 netdev->stats.tx_dropped++; 883 netif_stop_queue(netdev); 884 return NETDEV_TX_BUSY; 885 } 886 887 cnt = spider_net_set_low_watermark(card); 888 if (cnt < 5) 889 spider_net_kick_tx_dma(card); 890 return NETDEV_TX_OK; 891} 892 893/** 894 * spider_net_cleanup_tx_ring - cleans up the TX ring 895 * @card: card structure 896 * 897 * spider_net_cleanup_tx_ring is called by either the tx_timer 898 * or from the NAPI polling routine. 899 * This routine releases resources associted with transmitted 900 * packets, including updating the queue tail pointer. 901 */ 902static void 903spider_net_cleanup_tx_ring(struct timer_list *t) 904{ 905 struct spider_net_card *card = from_timer(card, t, tx_timer); 906 if ((spider_net_release_tx_chain(card, 0) != 0) && 907 (card->netdev->flags & IFF_UP)) { 908 spider_net_kick_tx_dma(card); 909 netif_wake_queue(card->netdev); 910 } 911} 912 913/** 914 * spider_net_do_ioctl - called for device ioctls 915 * @netdev: interface device structure 916 * @ifr: request parameter structure for ioctl 917 * @cmd: command code for ioctl 918 * 919 * returns 0 on success, <0 on failure. Currently, we have no special ioctls. 920 * -EOPNOTSUPP is returned, if an unknown ioctl was requested 921 */ 922static int 923spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) 924{ 925 switch (cmd) { 926 default: 927 return -EOPNOTSUPP; 928 } 929} 930 931/** 932 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on 933 * @descr: descriptor to process 934 * @card: card structure 935 * 936 * Fills out skb structure and passes the data to the stack. 937 * The descriptor state is not changed. 938 */ 939static void 940spider_net_pass_skb_up(struct spider_net_descr *descr, 941 struct spider_net_card *card) 942{ 943 struct spider_net_hw_descr *hwdescr = descr->hwdescr; 944 struct sk_buff *skb = descr->skb; 945 struct net_device *netdev = card->netdev; 946 u32 data_status = hwdescr->data_status; 947 u32 data_error = hwdescr->data_error; 948 949 skb_put(skb, hwdescr->valid_size); 950 951 /* the card seems to add 2 bytes of junk in front 952 * of the ethernet frame */ 953#define SPIDER_MISALIGN 2 954 skb_pull(skb, SPIDER_MISALIGN); 955 skb->protocol = eth_type_trans(skb, netdev); 956 957 /* checksum offload */ 958 skb_checksum_none_assert(skb); 959 if (netdev->features & NETIF_F_RXCSUM) { 960 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) == 961 SPIDER_NET_DATA_STATUS_CKSUM_MASK) && 962 !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK)) 963 skb->ip_summed = CHECKSUM_UNNECESSARY; 964 } 965 966 if (data_status & SPIDER_NET_VLAN_PACKET) { 967 /* further enhancements: HW-accel VLAN */ 968 } 969 970 /* update netdevice statistics */ 971 netdev->stats.rx_packets++; 972 netdev->stats.rx_bytes += skb->len; 973 974 /* pass skb up to stack */ 975 netif_receive_skb(skb); 976} 977 978static void show_rx_chain(struct spider_net_card *card) 979{ 980 struct spider_net_descr_chain *chain = &card->rx_chain; 981 struct spider_net_descr *start= chain->tail; 982 struct spider_net_descr *descr= start; 983 struct spider_net_hw_descr *hwd = start->hwdescr; 984 struct device *dev = &card->netdev->dev; 985 u32 curr_desc, next_desc; 986 int status; 987 988 int tot = 0; 989 int cnt = 0; 990 int off = start - chain->ring; 991 int cstat = hwd->dmac_cmd_status; 992 993 dev_info(dev, "Total number of descrs=%d\n", 994 chain->num_desc); 995 dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n", 996 off, cstat); 997 998 curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA); 999 next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA); 1000 1001 status = cstat; 1002 do 1003 { 1004 hwd = descr->hwdescr; 1005 off = descr - chain->ring; 1006 status = hwd->dmac_cmd_status; 1007 1008 if (descr == chain->head) 1009 dev_info(dev, "Chain head is at %d, head status=0x%x\n", 1010 off, status); 1011 1012 if (curr_desc == descr->bus_addr) 1013 dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n", 1014 off, status); 1015 1016 if (next_desc == descr->bus_addr) 1017 dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n", 1018 off, status); 1019 1020 if (hwd->next_descr_addr == 0) 1021 dev_info(dev, "chain is cut at %d\n", off); 1022 1023 if (cstat != status) { 1024 int from = (chain->num_desc + off - cnt) % chain->num_desc; 1025 int to = (chain->num_desc + off - 1) % chain->num_desc; 1026 dev_info(dev, "Have %d (from %d to %d) descrs " 1027 "with stat=0x%08x\n", cnt, from, to, cstat); 1028 cstat = status; 1029 cnt = 0; 1030 } 1031 1032 cnt ++; 1033 tot ++; 1034 descr = descr->next; 1035 } while (descr != start); 1036 1037 dev_info(dev, "Last %d descrs with stat=0x%08x " 1038 "for a total of %d descrs\n", cnt, cstat, tot); 1039 1040#ifdef DEBUG 1041 /* Now dump the whole ring */ 1042 descr = start; 1043 do 1044 { 1045 struct spider_net_hw_descr *hwd = descr->hwdescr; 1046 status = spider_net_get_descr_status(hwd); 1047 cnt = descr - chain->ring; 1048 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n", 1049 cnt, status, descr->skb); 1050 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n", 1051 descr->bus_addr, hwd->buf_addr, hwd->buf_size); 1052 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n", 1053 hwd->next_descr_addr, hwd->result_size, 1054 hwd->valid_size); 1055 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n", 1056 hwd->dmac_cmd_status, hwd->data_status, 1057 hwd->data_error); 1058 dev_info(dev, "\n"); 1059 1060 descr = descr->next; 1061 } while (descr != start); 1062#endif 1063 1064} 1065 1066/** 1067 * spider_net_resync_head_ptr - Advance head ptr past empty descrs 1068 * 1069 * If the driver fails to keep up and empty the queue, then the 1070 * hardware wil run out of room to put incoming packets. This 1071 * will cause the hardware to skip descrs that are full (instead 1072 * of halting/retrying). Thus, once the driver runs, it wil need 1073 * to "catch up" to where the hardware chain pointer is at. 1074 */ 1075static void spider_net_resync_head_ptr(struct spider_net_card *card) 1076{ 1077 unsigned long flags; 1078 struct spider_net_descr_chain *chain = &card->rx_chain; 1079 struct spider_net_descr *descr; 1080 int i, status; 1081 1082 /* Advance head pointer past any empty descrs */ 1083 descr = chain->head; 1084 status = spider_net_get_descr_status(descr->hwdescr); 1085 1086 if (status == SPIDER_NET_DESCR_NOT_IN_USE) 1087 return; 1088 1089 spin_lock_irqsave(&chain->lock, flags); 1090 1091 descr = chain->head; 1092 status = spider_net_get_descr_status(descr->hwdescr); 1093 for (i=0; i<chain->num_desc; i++) { 1094 if (status != SPIDER_NET_DESCR_CARDOWNED) break; 1095 descr = descr->next; 1096 status = spider_net_get_descr_status(descr->hwdescr); 1097 } 1098 chain->head = descr; 1099 1100 spin_unlock_irqrestore(&chain->lock, flags); 1101} 1102 1103static int spider_net_resync_tail_ptr(struct spider_net_card *card) 1104{ 1105 struct spider_net_descr_chain *chain = &card->rx_chain; 1106 struct spider_net_descr *descr; 1107 int i, status; 1108 1109 /* Advance tail pointer past any empty and reaped descrs */ 1110 descr = chain->tail; 1111 status = spider_net_get_descr_status(descr->hwdescr); 1112 1113 for (i=0; i<chain->num_desc; i++) { 1114 if ((status != SPIDER_NET_DESCR_CARDOWNED) && 1115 (status != SPIDER_NET_DESCR_NOT_IN_USE)) break; 1116 descr = descr->next; 1117 status = spider_net_get_descr_status(descr->hwdescr); 1118 } 1119 chain->tail = descr; 1120 1121 if ((i == chain->num_desc) || (i == 0)) 1122 return 1; 1123 return 0; 1124} 1125 1126/** 1127 * spider_net_decode_one_descr - processes an RX descriptor 1128 * @card: card structure 1129 * 1130 * Returns 1 if a packet has been sent to the stack, otherwise 0. 1131 * 1132 * Processes an RX descriptor by iommu-unmapping the data buffer 1133 * and passing the packet up to the stack. This function is called 1134 * in softirq context, e.g. either bottom half from interrupt or 1135 * NAPI polling context. 1136 */ 1137static int 1138spider_net_decode_one_descr(struct spider_net_card *card) 1139{ 1140 struct net_device *dev = card->netdev; 1141 struct spider_net_descr_chain *chain = &card->rx_chain; 1142 struct spider_net_descr *descr = chain->tail; 1143 struct spider_net_hw_descr *hwdescr = descr->hwdescr; 1144 u32 hw_buf_addr; 1145 int status; 1146 1147 status = spider_net_get_descr_status(hwdescr); 1148 1149 /* Nothing in the descriptor, or ring must be empty */ 1150 if ((status == SPIDER_NET_DESCR_CARDOWNED) || 1151 (status == SPIDER_NET_DESCR_NOT_IN_USE)) 1152 return 0; 1153 1154 /* descriptor definitively used -- move on tail */ 1155 chain->tail = descr->next; 1156 1157 /* unmap descriptor */ 1158 hw_buf_addr = hwdescr->buf_addr; 1159 hwdescr->buf_addr = 0xffffffff; 1160 pci_unmap_single(card->pdev, hw_buf_addr, 1161 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE); 1162 1163 if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) || 1164 (status == SPIDER_NET_DESCR_PROTECTION_ERROR) || 1165 (status == SPIDER_NET_DESCR_FORCE_END) ) { 1166 if (netif_msg_rx_err(card)) 1167 dev_err(&dev->dev, 1168 "dropping RX descriptor with state %d\n", status); 1169 dev->stats.rx_dropped++; 1170 goto bad_desc; 1171 } 1172 1173 if ( (status != SPIDER_NET_DESCR_COMPLETE) && 1174 (status != SPIDER_NET_DESCR_FRAME_END) ) { 1175 if (netif_msg_rx_err(card)) 1176 dev_err(&card->netdev->dev, 1177 "RX descriptor with unknown state %d\n", status); 1178 card->spider_stats.rx_desc_unk_state++; 1179 goto bad_desc; 1180 } 1181 1182 /* The cases we'll throw away the packet immediately */ 1183 if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) { 1184 if (netif_msg_rx_err(card)) 1185 dev_err(&card->netdev->dev, 1186 "error in received descriptor found, " 1187 "data_status=x%08x, data_error=x%08x\n", 1188 hwdescr->data_status, hwdescr->data_error); 1189 goto bad_desc; 1190 } 1191 1192 if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) { 1193 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n", 1194 hwdescr->dmac_cmd_status); 1195 pr_err("buf_addr=x%08x\n", hw_buf_addr); 1196 pr_err("buf_size=x%08x\n", hwdescr->buf_size); 1197 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr); 1198 pr_err("result_size=x%08x\n", hwdescr->result_size); 1199 pr_err("valid_size=x%08x\n", hwdescr->valid_size); 1200 pr_err("data_status=x%08x\n", hwdescr->data_status); 1201 pr_err("data_error=x%08x\n", hwdescr->data_error); 1202 pr_err("which=%ld\n", descr - card->rx_chain.ring); 1203 1204 card->spider_stats.rx_desc_error++; 1205 goto bad_desc; 1206 } 1207 1208 /* Ok, we've got a packet in descr */ 1209 spider_net_pass_skb_up(descr, card); 1210 descr->skb = NULL; 1211 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 1212 return 1; 1213 1214bad_desc: 1215 if (netif_msg_rx_err(card)) 1216 show_rx_chain(card); 1217 dev_kfree_skb_irq(descr->skb); 1218 descr->skb = NULL; 1219 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; 1220 return 0; 1221} 1222 1223/** 1224 * spider_net_poll - NAPI poll function called by the stack to return packets 1225 * @netdev: interface device structure 1226 * @budget: number of packets we can pass to the stack at most 1227 * 1228 * returns 0 if no more packets available to the driver/stack. Returns 1, 1229 * if the quota is exceeded, but the driver has still packets. 1230 * 1231 * spider_net_poll returns all packets from the rx descriptors to the stack 1232 * (using netif_receive_skb). If all/enough packets are up, the driver 1233 * reenables interrupts and returns 0. If not, 1 is returned. 1234 */ 1235static int spider_net_poll(struct napi_struct *napi, int budget) 1236{ 1237 struct spider_net_card *card = container_of(napi, struct spider_net_card, napi); 1238 int packets_done = 0; 1239 1240 while (packets_done < budget) { 1241 if (!spider_net_decode_one_descr(card)) 1242 break; 1243 1244 packets_done++; 1245 } 1246 1247 if ((packets_done == 0) && (card->num_rx_ints != 0)) { 1248 if (!spider_net_resync_tail_ptr(card)) 1249 packets_done = budget; 1250 spider_net_resync_head_ptr(card); 1251 } 1252 card->num_rx_ints = 0; 1253 1254 spider_net_refill_rx_chain(card); 1255 spider_net_enable_rxdmac(card); 1256 1257 spider_net_cleanup_tx_ring(&card->tx_timer); 1258 1259 /* if all packets are in the stack, enable interrupts and return 0 */ 1260 /* if not, return 1 */ 1261 if (packets_done < budget) { 1262 napi_complete_done(napi, packets_done); 1263 spider_net_rx_irq_on(card); 1264 card->ignore_rx_ramfull = 0; 1265 } 1266 1267 return packets_done; 1268} 1269 1270/** 1271 * spider_net_set_mac - sets the MAC of an interface 1272 * @netdev: interface device structure 1273 * @ptr: pointer to new MAC address 1274 * 1275 * Returns 0 on success, <0 on failure. Currently, we don't support this 1276 * and will always return EOPNOTSUPP. 1277 */ 1278static int 1279spider_net_set_mac(struct net_device *netdev, void *p) 1280{ 1281 struct spider_net_card *card = netdev_priv(netdev); 1282 u32 macl, macu, regvalue; 1283 struct sockaddr *addr = p; 1284 1285 if (!is_valid_ether_addr(addr->sa_data)) 1286 return -EADDRNOTAVAIL; 1287 1288 memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN); 1289 1290 /* switch off GMACTPE and GMACRPE */ 1291 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD); 1292 regvalue &= ~((1 << 5) | (1 << 6)); 1293 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue); 1294 1295 /* write mac */ 1296 macu = (netdev->dev_addr[0]<<24) + (netdev->dev_addr[1]<<16) + 1297 (netdev->dev_addr[2]<<8) + (netdev->dev_addr[3]); 1298 macl = (netdev->dev_addr[4]<<8) + (netdev->dev_addr[5]); 1299 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu); 1300 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl); 1301 1302 /* switch GMACTPE and GMACRPE back on */ 1303 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD); 1304 regvalue |= ((1 << 5) | (1 << 6)); 1305 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue); 1306 1307 spider_net_set_promisc(card); 1308 1309 return 0; 1310} 1311 1312/** 1313 * spider_net_link_reset 1314 * @netdev: net device structure 1315 * 1316 * This is called when the PHY_LINK signal is asserted. For the blade this is 1317 * not connected so we should never get here. 1318 * 1319 */ 1320static void 1321spider_net_link_reset(struct net_device *netdev) 1322{ 1323 1324 struct spider_net_card *card = netdev_priv(netdev); 1325 1326 del_timer_sync(&card->aneg_timer); 1327 1328 /* clear interrupt, block further interrupts */ 1329 spider_net_write_reg(card, SPIDER_NET_GMACST, 1330 spider_net_read_reg(card, SPIDER_NET_GMACST)); 1331 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0); 1332 1333 /* reset phy and setup aneg */ 1334 card->aneg_count = 0; 1335 card->medium = BCM54XX_COPPER; 1336 spider_net_setup_aneg(card); 1337 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER); 1338 1339} 1340 1341/** 1342 * spider_net_handle_error_irq - handles errors raised by an interrupt 1343 * @card: card structure 1344 * @status_reg: interrupt status register 0 (GHIINT0STS) 1345 * 1346 * spider_net_handle_error_irq treats or ignores all error conditions 1347 * found when an interrupt is presented 1348 */ 1349static void 1350spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg, 1351 u32 error_reg1, u32 error_reg2) 1352{ 1353 u32 i; 1354 int show_error = 1; 1355 1356 /* check GHIINT0STS ************************************/ 1357 if (status_reg) 1358 for (i = 0; i < 32; i++) 1359 if (status_reg & (1<<i)) 1360 switch (i) 1361 { 1362 /* let error_reg1 and error_reg2 evaluation decide, what to do 1363 case SPIDER_NET_PHYINT: 1364 case SPIDER_NET_GMAC2INT: 1365 case SPIDER_NET_GMAC1INT: 1366 case SPIDER_NET_GFIFOINT: 1367 case SPIDER_NET_DMACINT: 1368 case SPIDER_NET_GSYSINT: 1369 break; */ 1370 1371 case SPIDER_NET_GIPSINT: 1372 show_error = 0; 1373 break; 1374 1375 case SPIDER_NET_GPWOPCMPINT: 1376 /* PHY write operation completed */ 1377 show_error = 0; 1378 break; 1379 case SPIDER_NET_GPROPCMPINT: 1380 /* PHY read operation completed */ 1381 /* we don't use semaphores, as we poll for the completion 1382 * of the read operation in spider_net_read_phy. Should take 1383 * about 50 us */ 1384 show_error = 0; 1385 break; 1386 case SPIDER_NET_GPWFFINT: 1387 /* PHY command queue full */ 1388 if (netif_msg_intr(card)) 1389 dev_err(&card->netdev->dev, "PHY write queue full\n"); 1390 show_error = 0; 1391 break; 1392 1393 /* case SPIDER_NET_GRMDADRINT: not used. print a message */ 1394 /* case SPIDER_NET_GRMARPINT: not used. print a message */ 1395 /* case SPIDER_NET_GRMMPINT: not used. print a message */ 1396 1397 case SPIDER_NET_GDTDEN0INT: 1398 /* someone has set TX_DMA_EN to 0 */ 1399 show_error = 0; 1400 break; 1401 1402 case SPIDER_NET_GDDDEN0INT: /* fallthrough */ 1403 case SPIDER_NET_GDCDEN0INT: /* fallthrough */ 1404 case SPIDER_NET_GDBDEN0INT: /* fallthrough */ 1405 case SPIDER_NET_GDADEN0INT: 1406 /* someone has set RX_DMA_EN to 0 */ 1407 show_error = 0; 1408 break; 1409 1410 /* RX interrupts */ 1411 case SPIDER_NET_GDDFDCINT: 1412 case SPIDER_NET_GDCFDCINT: 1413 case SPIDER_NET_GDBFDCINT: 1414 case SPIDER_NET_GDAFDCINT: 1415 /* case SPIDER_NET_GDNMINT: not used. print a message */ 1416 /* case SPIDER_NET_GCNMINT: not used. print a message */ 1417 /* case SPIDER_NET_GBNMINT: not used. print a message */ 1418 /* case SPIDER_NET_GANMINT: not used. print a message */ 1419 /* case SPIDER_NET_GRFNMINT: not used. print a message */ 1420 show_error = 0; 1421 break; 1422 1423 /* TX interrupts */ 1424 case SPIDER_NET_GDTFDCINT: 1425 show_error = 0; 1426 break; 1427 case SPIDER_NET_GTTEDINT: 1428 show_error = 0; 1429 break; 1430 case SPIDER_NET_GDTDCEINT: 1431 /* chain end. If a descriptor should be sent, kick off 1432 * tx dma 1433 if (card->tx_chain.tail != card->tx_chain.head) 1434 spider_net_kick_tx_dma(card); 1435 */ 1436 show_error = 0; 1437 break; 1438 1439 /* case SPIDER_NET_G1TMCNTINT: not used. print a message */ 1440 /* case SPIDER_NET_GFREECNTINT: not used. print a message */ 1441 } 1442 1443 /* check GHIINT1STS ************************************/ 1444 if (error_reg1) 1445 for (i = 0; i < 32; i++) 1446 if (error_reg1 & (1<<i)) 1447 switch (i) 1448 { 1449 case SPIDER_NET_GTMFLLINT: 1450 /* TX RAM full may happen on a usual case. 1451 * Logging is not needed. */ 1452 show_error = 0; 1453 break; 1454 case SPIDER_NET_GRFDFLLINT: /* fallthrough */ 1455 case SPIDER_NET_GRFCFLLINT: /* fallthrough */ 1456 case SPIDER_NET_GRFBFLLINT: /* fallthrough */ 1457 case SPIDER_NET_GRFAFLLINT: /* fallthrough */ 1458 case SPIDER_NET_GRMFLLINT: 1459 /* Could happen when rx chain is full */ 1460 if (card->ignore_rx_ramfull == 0) { 1461 card->ignore_rx_ramfull = 1; 1462 spider_net_resync_head_ptr(card); 1463 spider_net_refill_rx_chain(card); 1464 spider_net_enable_rxdmac(card); 1465 card->num_rx_ints ++; 1466 napi_schedule(&card->napi); 1467 } 1468 show_error = 0; 1469 break; 1470 1471 /* case SPIDER_NET_GTMSHTINT: problem, print a message */ 1472 case SPIDER_NET_GDTINVDINT: 1473 /* allrighty. tx from previous descr ok */ 1474 show_error = 0; 1475 break; 1476 1477 /* chain end */ 1478 case SPIDER_NET_GDDDCEINT: /* fallthrough */ 1479 case SPIDER_NET_GDCDCEINT: /* fallthrough */ 1480 case SPIDER_NET_GDBDCEINT: /* fallthrough */ 1481 case SPIDER_NET_GDADCEINT: 1482 spider_net_resync_head_ptr(card); 1483 spider_net_refill_rx_chain(card); 1484 spider_net_enable_rxdmac(card); 1485 card->num_rx_ints ++; 1486 napi_schedule(&card->napi); 1487 show_error = 0; 1488 break; 1489 1490 /* invalid descriptor */ 1491 case SPIDER_NET_GDDINVDINT: /* fallthrough */ 1492 case SPIDER_NET_GDCINVDINT: /* fallthrough */ 1493 case SPIDER_NET_GDBINVDINT: /* fallthrough */ 1494 case SPIDER_NET_GDAINVDINT: 1495 /* Could happen when rx chain is full */ 1496 spider_net_resync_head_ptr(card); 1497 spider_net_refill_rx_chain(card); 1498 spider_net_enable_rxdmac(card); 1499 card->num_rx_ints ++; 1500 napi_schedule(&card->napi); 1501 show_error = 0; 1502 break; 1503 1504 /* case SPIDER_NET_GDTRSERINT: problem, print a message */ 1505 /* case SPIDER_NET_GDDRSERINT: problem, print a message */ 1506 /* case SPIDER_NET_GDCRSERINT: problem, print a message */ 1507 /* case SPIDER_NET_GDBRSERINT: problem, print a message */ 1508 /* case SPIDER_NET_GDARSERINT: problem, print a message */ 1509 /* case SPIDER_NET_GDSERINT: problem, print a message */ 1510 /* case SPIDER_NET_GDTPTERINT: problem, print a message */ 1511 /* case SPIDER_NET_GDDPTERINT: problem, print a message */ 1512 /* case SPIDER_NET_GDCPTERINT: problem, print a message */ 1513 /* case SPIDER_NET_GDBPTERINT: problem, print a message */ 1514 /* case SPIDER_NET_GDAPTERINT: problem, print a message */ 1515 default: 1516 show_error = 1; 1517 break; 1518 } 1519 1520 /* check GHIINT2STS ************************************/ 1521 if (error_reg2) 1522 for (i = 0; i < 32; i++) 1523 if (error_reg2 & (1<<i)) 1524 switch (i) 1525 { 1526 /* there is nothing we can (want to) do at this time. Log a 1527 * message, we can switch on and off the specific values later on 1528 case SPIDER_NET_GPROPERINT: 1529 case SPIDER_NET_GMCTCRSNGINT: 1530 case SPIDER_NET_GMCTLCOLINT: 1531 case SPIDER_NET_GMCTTMOTINT: 1532 case SPIDER_NET_GMCRCAERINT: 1533 case SPIDER_NET_GMCRCALERINT: 1534 case SPIDER_NET_GMCRALNERINT: 1535 case SPIDER_NET_GMCROVRINT: 1536 case SPIDER_NET_GMCRRNTINT: 1537 case SPIDER_NET_GMCRRXERINT: 1538 case SPIDER_NET_GTITCSERINT: 1539 case SPIDER_NET_GTIFMTERINT: 1540 case SPIDER_NET_GTIPKTRVKINT: 1541 case SPIDER_NET_GTISPINGINT: 1542 case SPIDER_NET_GTISADNGINT: 1543 case SPIDER_NET_GTISPDNGINT: 1544 case SPIDER_NET_GRIFMTERINT: 1545 case SPIDER_NET_GRIPKTRVKINT: 1546 case SPIDER_NET_GRISPINGINT: 1547 case SPIDER_NET_GRISADNGINT: 1548 case SPIDER_NET_GRISPDNGINT: 1549 break; 1550 */ 1551 default: 1552 break; 1553 } 1554 1555 if ((show_error) && (netif_msg_intr(card)) && net_ratelimit()) 1556 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, " 1557 "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n", 1558 status_reg, error_reg1, error_reg2); 1559 1560 /* clear interrupt sources */ 1561 spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1); 1562 spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2); 1563} 1564 1565/** 1566 * spider_net_interrupt - interrupt handler for spider_net 1567 * @irq: interrupt number 1568 * @ptr: pointer to net_device 1569 * 1570 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no 1571 * interrupt found raised by card. 1572 * 1573 * This is the interrupt handler, that turns off 1574 * interrupts for this device and makes the stack poll the driver 1575 */ 1576static irqreturn_t 1577spider_net_interrupt(int irq, void *ptr) 1578{ 1579 struct net_device *netdev = ptr; 1580 struct spider_net_card *card = netdev_priv(netdev); 1581 u32 status_reg, error_reg1, error_reg2; 1582 1583 status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS); 1584 error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS); 1585 error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS); 1586 1587 if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) && 1588 !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) && 1589 !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE)) 1590 return IRQ_NONE; 1591 1592 if (status_reg & SPIDER_NET_RXINT ) { 1593 spider_net_rx_irq_off(card); 1594 napi_schedule(&card->napi); 1595 card->num_rx_ints ++; 1596 } 1597 if (status_reg & SPIDER_NET_TXINT) 1598 napi_schedule(&card->napi); 1599 1600 if (status_reg & SPIDER_NET_LINKINT) 1601 spider_net_link_reset(netdev); 1602 1603 if (status_reg & SPIDER_NET_ERRINT ) 1604 spider_net_handle_error_irq(card, status_reg, 1605 error_reg1, error_reg2); 1606 1607 /* clear interrupt sources */ 1608 spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg); 1609 1610 return IRQ_HANDLED; 1611} 1612 1613#ifdef CONFIG_NET_POLL_CONTROLLER 1614/** 1615 * spider_net_poll_controller - artificial interrupt for netconsole etc. 1616 * @netdev: interface device structure 1617 * 1618 * see Documentation/networking/netconsole.txt 1619 */ 1620static void 1621spider_net_poll_controller(struct net_device *netdev) 1622{ 1623 disable_irq(netdev->irq); 1624 spider_net_interrupt(netdev->irq, netdev); 1625 enable_irq(netdev->irq); 1626} 1627#endif /* CONFIG_NET_POLL_CONTROLLER */ 1628 1629/** 1630 * spider_net_enable_interrupts - enable interrupts 1631 * @card: card structure 1632 * 1633 * spider_net_enable_interrupt enables several interrupts 1634 */ 1635static void 1636spider_net_enable_interrupts(struct spider_net_card *card) 1637{ 1638 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 1639 SPIDER_NET_INT0_MASK_VALUE); 1640 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 1641 SPIDER_NET_INT1_MASK_VALUE); 1642 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 1643 SPIDER_NET_INT2_MASK_VALUE); 1644} 1645 1646/** 1647 * spider_net_disable_interrupts - disable interrupts 1648 * @card: card structure 1649 * 1650 * spider_net_disable_interrupts disables all the interrupts 1651 */ 1652static void 1653spider_net_disable_interrupts(struct spider_net_card *card) 1654{ 1655 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0); 1656 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0); 1657 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0); 1658 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0); 1659} 1660 1661/** 1662 * spider_net_init_card - initializes the card 1663 * @card: card structure 1664 * 1665 * spider_net_init_card initializes the card so that other registers can 1666 * be used 1667 */ 1668static void 1669spider_net_init_card(struct spider_net_card *card) 1670{ 1671 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 1672 SPIDER_NET_CKRCTRL_STOP_VALUE); 1673 1674 spider_net_write_reg(card, SPIDER_NET_CKRCTRL, 1675 SPIDER_NET_CKRCTRL_RUN_VALUE); 1676 1677 /* trigger ETOMOD signal */ 1678 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, 1679 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4); 1680 1681 spider_net_disable_interrupts(card); 1682} 1683 1684/** 1685 * spider_net_enable_card - enables the card by setting all kinds of regs 1686 * @card: card structure 1687 * 1688 * spider_net_enable_card sets a lot of SMMIO registers to enable the device 1689 */ 1690static void 1691spider_net_enable_card(struct spider_net_card *card) 1692{ 1693 int i; 1694 /* the following array consists of (register),(value) pairs 1695 * that are set in this function. A register of 0 ends the list */ 1696 u32 regs[][2] = { 1697 { SPIDER_NET_GRESUMINTNUM, 0 }, 1698 { SPIDER_NET_GREINTNUM, 0 }, 1699 1700 /* set interrupt frame number registers */ 1701 /* clear the single DMA engine registers first */ 1702 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1703 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1704 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1705 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE }, 1706 /* then set, what we really need */ 1707 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE }, 1708 1709 /* timer counter registers and stuff */ 1710 { SPIDER_NET_GFREECNNUM, 0 }, 1711 { SPIDER_NET_GONETIMENUM, 0 }, 1712 { SPIDER_NET_GTOUTFRMNUM, 0 }, 1713 1714 /* RX mode setting */ 1715 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE }, 1716 /* TX mode setting */ 1717 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE }, 1718 /* IPSEC mode setting */ 1719 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE }, 1720 1721 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE }, 1722 1723 { SPIDER_NET_GMRWOLCTRL, 0 }, 1724 { SPIDER_NET_GTESTMD, 0x10000000 }, 1725 { SPIDER_NET_GTTQMSK, 0x00400040 }, 1726 1727 { SPIDER_NET_GMACINTEN, 0 }, 1728 1729 /* flow control stuff */ 1730 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE }, 1731 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE }, 1732 1733 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE }, 1734 { 0, 0} 1735 }; 1736 1737 i = 0; 1738 while (regs[i][0]) { 1739 spider_net_write_reg(card, regs[i][0], regs[i][1]); 1740 i++; 1741 } 1742 1743 /* clear unicast filter table entries 1 to 14 */ 1744 for (i = 1; i <= 14; i++) { 1745 spider_net_write_reg(card, 1746 SPIDER_NET_GMRUAFILnR + i * 8, 1747 0x00080000); 1748 spider_net_write_reg(card, 1749 SPIDER_NET_GMRUAFILnR + i * 8 + 4, 1750 0x00000000); 1751 } 1752 1753 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000); 1754 1755 spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE); 1756 1757 /* set chain tail address fo…
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