1/* 2 * Copyright (c) 2005 Ammasso, Inc. All rights reserved. 3 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33#include <linux/module.h> 34#include <linux/moduleparam.h> 35#include <linux/pci.h> 36#include <linux/netdevice.h> 37#include <linux/etherdevice.h> 38#include <linux/inetdevice.h> 39#include <linux/delay.h> 40#include <linux/ethtool.h> 41#include <linux/mii.h> 42#include <linux/if_vlan.h> 43#include <linux/crc32.h> 44#include <linux/in.h> 45#include <linux/ip.h> 46#include <linux/tcp.h> 47#include <linux/init.h> 48#include <linux/dma-mapping.h> 49#include <linux/slab.h> 50 51#include <asm/io.h> 52#include <asm/irq.h> 53#include <asm/byteorder.h> 54 55#include <rdma/ib_smi.h> 56#include "c2.h" 57#include "c2_provider.h" 58 59MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>"); 60MODULE_DESCRIPTION("Ammasso AMSO1100 Low-level iWARP Driver"); 61MODULE_LICENSE("Dual BSD/GPL"); 62MODULE_VERSION(DRV_VERSION); 63 64static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK 65 | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN; 66 67static int debug = -1; /* defaults above */ 68module_param(debug, int, 0); 69MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)"); 70 71static int c2_up(struct net_device *netdev); 72static int c2_down(struct net_device *netdev); 73static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev); 74static void c2_tx_interrupt(struct net_device *netdev); 75static void c2_rx_interrupt(struct net_device *netdev); 76static irqreturn_t c2_interrupt(int irq, void *dev_id); 77static void c2_tx_timeout(struct net_device *netdev); 78static int c2_change_mtu(struct net_device *netdev, int new_mtu); 79static void c2_reset(struct c2_port *c2_port); 80 81static struct pci_device_id c2_pci_table[] = { 82 { PCI_DEVICE(0x18b8, 0xb001) }, 83 { 0 } 84}; 85 86MODULE_DEVICE_TABLE(pci, c2_pci_table); 87 88static void c2_print_macaddr(struct net_device *netdev) 89{ 90 pr_debug("%s: MAC %pM, IRQ %u\n", netdev->name, netdev->dev_addr, netdev->irq); 91} 92 93static void c2_set_rxbufsize(struct c2_port *c2_port) 94{ 95 struct net_device *netdev = c2_port->netdev; 96 97 if (netdev->mtu > RX_BUF_SIZE) 98 c2_port->rx_buf_size = 99 netdev->mtu + ETH_HLEN + sizeof(struct c2_rxp_hdr) + 100 NET_IP_ALIGN; 101 else 102 c2_port->rx_buf_size = sizeof(struct c2_rxp_hdr) + RX_BUF_SIZE; 103} 104 105/* 106 * Allocate TX ring elements and chain them together. 107 * One-to-one association of adapter descriptors with ring elements. 108 */ 109static int c2_tx_ring_alloc(struct c2_ring *tx_ring, void *vaddr, 110 dma_addr_t base, void __iomem * mmio_txp_ring) 111{ 112 struct c2_tx_desc *tx_desc; 113 struct c2_txp_desc __iomem *txp_desc; 114 struct c2_element *elem; 115 int i; 116 117 tx_ring->start = kmalloc(sizeof(*elem) * tx_ring->count, GFP_KERNEL); 118 if (!tx_ring->start) 119 return -ENOMEM; 120 121 elem = tx_ring->start; 122 tx_desc = vaddr; 123 txp_desc = mmio_txp_ring; 124 for (i = 0; i < tx_ring->count; i++, elem++, tx_desc++, txp_desc++) { 125 tx_desc->len = 0; 126 tx_desc->status = 0; 127 128 /* Set TXP_HTXD_UNINIT */ 129 __raw_writeq((__force u64) cpu_to_be64(0x1122334455667788ULL), 130 (void __iomem *) txp_desc + C2_TXP_ADDR); 131 __raw_writew(0, (void __iomem *) txp_desc + C2_TXP_LEN); 132 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_UNINIT), 133 (void __iomem *) txp_desc + C2_TXP_FLAGS); 134 135 elem->skb = NULL; 136 elem->ht_desc = tx_desc; 137 elem->hw_desc = txp_desc; 138 139 if (i == tx_ring->count - 1) { 140 elem->next = tx_ring->start; 141 tx_desc->next_offset = base; 142 } else { 143 elem->next = elem + 1; 144 tx_desc->next_offset = 145 base + (i + 1) * sizeof(*tx_desc); 146 } 147 } 148 149 tx_ring->to_use = tx_ring->to_clean = tx_ring->start; 150 151 return 0; 152} 153 154/* 155 * Allocate RX ring elements and chain them together. 156 * One-to-one association of adapter descriptors with ring elements. 157 */ 158static int c2_rx_ring_alloc(struct c2_ring *rx_ring, void *vaddr, 159 dma_addr_t base, void __iomem * mmio_rxp_ring) 160{ 161 struct c2_rx_desc *rx_desc; 162 struct c2_rxp_desc __iomem *rxp_desc; 163 struct c2_element *elem; 164 int i; 165 166 rx_ring->start = kmalloc(sizeof(*elem) * rx_ring->count, GFP_KERNEL); 167 if (!rx_ring->start) 168 return -ENOMEM; 169 170 elem = rx_ring->start; 171 rx_desc = vaddr; 172 rxp_desc = mmio_rxp_ring; 173 for (i = 0; i < rx_ring->count; i++, elem++, rx_desc++, rxp_desc++) { 174 rx_desc->len = 0; 175 rx_desc->status = 0; 176 177 /* Set RXP_HRXD_UNINIT */ 178 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_OK), 179 (void __iomem *) rxp_desc + C2_RXP_STATUS); 180 __raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_COUNT); 181 __raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_LEN); 182 __raw_writeq((__force u64) cpu_to_be64(0x99aabbccddeeffULL), 183 (void __iomem *) rxp_desc + C2_RXP_ADDR); 184 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_UNINIT), 185 (void __iomem *) rxp_desc + C2_RXP_FLAGS); 186 187 elem->skb = NULL; 188 elem->ht_desc = rx_desc; 189 elem->hw_desc = rxp_desc; 190 191 if (i == rx_ring->count - 1) { 192 elem->next = rx_ring->start; 193 rx_desc->next_offset = base; 194 } else { 195 elem->next = elem + 1; 196 rx_desc->next_offset = 197 base + (i + 1) * sizeof(*rx_desc); 198 } 199 } 200 201 rx_ring->to_use = rx_ring->to_clean = rx_ring->start; 202 203 return 0; 204} 205 206/* Setup buffer for receiving */ 207static inline int c2_rx_alloc(struct c2_port *c2_port, struct c2_element *elem) 208{ 209 struct c2_dev *c2dev = c2_port->c2dev; 210 struct c2_rx_desc *rx_desc = elem->ht_desc; 211 struct sk_buff *skb; 212 dma_addr_t mapaddr; 213 u32 maplen; 214 struct c2_rxp_hdr *rxp_hdr; 215 216 skb = dev_alloc_skb(c2_port->rx_buf_size); 217 if (unlikely(!skb)) { 218 pr_debug("%s: out of memory for receive\n", 219 c2_port->netdev->name); 220 return -ENOMEM; 221 } 222 223 /* Zero out the rxp hdr in the sk_buff */ 224 memset(skb->data, 0, sizeof(*rxp_hdr)); 225 226 skb->dev = c2_port->netdev; 227 228 maplen = c2_port->rx_buf_size; 229 mapaddr = 230 pci_map_single(c2dev->pcidev, skb->data, maplen, 231 PCI_DMA_FROMDEVICE); 232 233 /* Set the sk_buff RXP_header to RXP_HRXD_READY */ 234 rxp_hdr = (struct c2_rxp_hdr *) skb->data; 235 rxp_hdr->flags = RXP_HRXD_READY; 236 237 __raw_writew(0, elem->hw_desc + C2_RXP_STATUS); 238 __raw_writew((__force u16) cpu_to_be16((u16) maplen - sizeof(*rxp_hdr)), 239 elem->hw_desc + C2_RXP_LEN); 240 __raw_writeq((__force u64) cpu_to_be64(mapaddr), elem->hw_desc + C2_RXP_ADDR); 241 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY), 242 elem->hw_desc + C2_RXP_FLAGS); 243 244 elem->skb = skb; 245 elem->mapaddr = mapaddr; 246 elem->maplen = maplen; 247 rx_desc->len = maplen; 248 249 return 0; 250} 251 252/* 253 * Allocate buffers for the Rx ring 254 * For receive: rx_ring.to_clean is next received frame 255 */ 256static int c2_rx_fill(struct c2_port *c2_port) 257{ 258 struct c2_ring *rx_ring = &c2_port->rx_ring; 259 struct c2_element *elem; 260 int ret = 0; 261 262 elem = rx_ring->start; 263 do { 264 if (c2_rx_alloc(c2_port, elem)) { 265 ret = 1; 266 break; 267 } 268 } while ((elem = elem->next) != rx_ring->start); 269 270 rx_ring->to_clean = rx_ring->start; 271 return ret; 272} 273 274/* Free all buffers in RX ring, assumes receiver stopped */ 275static void c2_rx_clean(struct c2_port *c2_port) 276{ 277 struct c2_dev *c2dev = c2_port->c2dev; 278 struct c2_ring *rx_ring = &c2_port->rx_ring; 279 struct c2_element *elem; 280 struct c2_rx_desc *rx_desc; 281 282 elem = rx_ring->start; 283 do { 284 rx_desc = elem->ht_desc; 285 rx_desc->len = 0; 286 287 __raw_writew(0, elem->hw_desc + C2_RXP_STATUS); 288 __raw_writew(0, elem->hw_desc + C2_RXP_COUNT); 289 __raw_writew(0, elem->hw_desc + C2_RXP_LEN); 290 __raw_writeq((__force u64) cpu_to_be64(0x99aabbccddeeffULL), 291 elem->hw_desc + C2_RXP_ADDR); 292 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_UNINIT), 293 elem->hw_desc + C2_RXP_FLAGS); 294 295 if (elem->skb) { 296 pci_unmap_single(c2dev->pcidev, elem->mapaddr, 297 elem->maplen, PCI_DMA_FROMDEVICE); 298 dev_kfree_skb(elem->skb); 299 elem->skb = NULL; 300 } 301 } while ((elem = elem->next) != rx_ring->start); 302} 303 304static inline int c2_tx_free(struct c2_dev *c2dev, struct c2_element *elem) 305{ 306 struct c2_tx_desc *tx_desc = elem->ht_desc; 307 308 tx_desc->len = 0; 309 310 pci_unmap_single(c2dev->pcidev, elem->mapaddr, elem->maplen, 311 PCI_DMA_TODEVICE); 312 313 if (elem->skb) { 314 dev_kfree_skb_any(elem->skb); 315 elem->skb = NULL; 316 } 317 318 return 0; 319} 320 321/* Free all buffers in TX ring, assumes transmitter stopped */ 322static void c2_tx_clean(struct c2_port *c2_port) 323{ 324 struct c2_ring *tx_ring = &c2_port->tx_ring; 325 struct c2_element *elem; 326 struct c2_txp_desc txp_htxd; 327 int retry; 328 unsigned long flags; 329 330 spin_lock_irqsave(&c2_port->tx_lock, flags); 331 332 elem = tx_ring->start; 333 334 do { 335 retry = 0; 336 do { 337 txp_htxd.flags = 338 readw(elem->hw_desc + C2_TXP_FLAGS); 339 340 if (txp_htxd.flags == TXP_HTXD_READY) { 341 retry = 1; 342 __raw_writew(0, 343 elem->hw_desc + C2_TXP_LEN); 344 __raw_writeq(0, 345 elem->hw_desc + C2_TXP_ADDR); 346 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_DONE), 347 elem->hw_desc + C2_TXP_FLAGS); 348 c2_port->netdev->stats.tx_dropped++; 349 break; 350 } else { 351 __raw_writew(0, 352 elem->hw_desc + C2_TXP_LEN); 353 __raw_writeq((__force u64) cpu_to_be64(0x1122334455667788ULL), 354 elem->hw_desc + C2_TXP_ADDR); 355 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_UNINIT), 356 elem->hw_desc + C2_TXP_FLAGS); 357 } 358 359 c2_tx_free(c2_port->c2dev, elem); 360 361 } while ((elem = elem->next) != tx_ring->start); 362 } while (retry); 363 364 c2_port->tx_avail = c2_port->tx_ring.count - 1; 365 c2_port->c2dev->cur_tx = tx_ring->to_use - tx_ring->start; 366 367 if (c2_port->tx_avail > MAX_SKB_FRAGS + 1) 368 netif_wake_queue(c2_port->netdev); 369 370 spin_unlock_irqrestore(&c2_port->tx_lock, flags); 371} 372 373/* 374 * Process transmit descriptors marked 'DONE' by the firmware, 375 * freeing up their unneeded sk_buffs. 376 */ 377static void c2_tx_interrupt(struct net_device *netdev) 378{ 379 struct c2_port *c2_port = netdev_priv(netdev); 380 struct c2_dev *c2dev = c2_port->c2dev; 381 struct c2_ring *tx_ring = &c2_port->tx_ring; 382 struct c2_element *elem; 383 struct c2_txp_desc txp_htxd; 384 385 spin_lock(&c2_port->tx_lock); 386 387 for (elem = tx_ring->to_clean; elem != tx_ring->to_use; 388 elem = elem->next) { 389 txp_htxd.flags = 390 be16_to_cpu((__force __be16) readw(elem->hw_desc + C2_TXP_FLAGS)); 391 392 if (txp_htxd.flags != TXP_HTXD_DONE) 393 break; 394 395 if (netif_msg_tx_done(c2_port)) { 396 /* PCI reads are expensive in fast path */ 397 txp_htxd.len = 398 be16_to_cpu((__force __be16) readw(elem->hw_desc + C2_TXP_LEN)); 399 pr_debug("%s: tx done slot %3Zu status 0x%x len " 400 "%5u bytes\n", 401 netdev->name, elem - tx_ring->start, 402 txp_htxd.flags, txp_htxd.len); 403 } 404 405 c2_tx_free(c2dev, elem); 406 ++(c2_port->tx_avail); 407 } 408 409 tx_ring->to_clean = elem; 410 411 if (netif_queue_stopped(netdev) 412 && c2_port->tx_avail > MAX_SKB_FRAGS + 1) 413 netif_wake_queue(netdev); 414 415 spin_unlock(&c2_port->tx_lock); 416} 417 418static void c2_rx_error(struct c2_port *c2_port, struct c2_element *elem) 419{ 420 struct c2_rx_desc *rx_desc = elem->ht_desc; 421 struct c2_rxp_hdr *rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data; 422 423 if (rxp_hdr->status != RXP_HRXD_OK || 424 rxp_hdr->len > (rx_desc->len - sizeof(*rxp_hdr))) { 425 pr_debug("BAD RXP_HRXD\n"); 426 pr_debug(" rx_desc : %p\n", rx_desc); 427 pr_debug(" index : %Zu\n", 428 elem - c2_port->rx_ring.start); 429 pr_debug(" len : %u\n", rx_desc->len); 430 pr_debug(" rxp_hdr : %p [PA %p]\n", rxp_hdr, 431 (void *) __pa((unsigned long) rxp_hdr)); 432 pr_debug(" flags : 0x%x\n", rxp_hdr->flags); 433 pr_debug(" status: 0x%x\n", rxp_hdr->status); 434 pr_debug(" len : %u\n", rxp_hdr->len); 435 pr_debug(" rsvd : 0x%x\n", rxp_hdr->rsvd); 436 } 437 438 /* Setup the skb for reuse since we're dropping this pkt */ 439 elem->skb->data = elem->skb->head; 440 skb_reset_tail_pointer(elem->skb); 441 442 /* Zero out the rxp hdr in the sk_buff */ 443 memset(elem->skb->data, 0, sizeof(*rxp_hdr)); 444 445 /* Write the descriptor to the adapter's rx ring */ 446 __raw_writew(0, elem->hw_desc + C2_RXP_STATUS); 447 __raw_writew(0, elem->hw_desc + C2_RXP_COUNT); 448 __raw_writew((__force u16) cpu_to_be16((u16) elem->maplen - sizeof(*rxp_hdr)), 449 elem->hw_desc + C2_RXP_LEN); 450 __raw_writeq((__force u64) cpu_to_be64(elem->mapaddr), 451 elem->hw_desc + C2_RXP_ADDR); 452 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY), 453 elem->hw_desc + C2_RXP_FLAGS); 454 455 pr_debug("packet dropped\n"); 456 c2_port->netdev->stats.rx_dropped++; 457} 458 459static void c2_rx_interrupt(struct net_device *netdev) 460{ 461 struct c2_port *c2_port = netdev_priv(netdev); 462 struct c2_dev *c2dev = c2_port->c2dev; 463 struct c2_ring *rx_ring = &c2_port->rx_ring; 464 struct c2_element *elem; 465 struct c2_rx_desc *rx_desc; 466 struct c2_rxp_hdr *rxp_hdr; 467 struct sk_buff *skb; 468 dma_addr_t mapaddr; 469 u32 maplen, buflen; 470 unsigned long flags; 471 472 spin_lock_irqsave(&c2dev->lock, flags); 473 474 /* Begin where we left off */ 475 rx_ring->to_clean = rx_ring->start + c2dev->cur_rx; 476 477 for (elem = rx_ring->to_clean; elem->next != rx_ring->to_clean; 478 elem = elem->next) { 479 rx_desc = elem->ht_desc; 480 mapaddr = elem->mapaddr; 481 maplen = elem->maplen; 482 skb = elem->skb; 483 rxp_hdr = (struct c2_rxp_hdr *) skb->data; 484 485 if (rxp_hdr->flags != RXP_HRXD_DONE) 486 break; 487 buflen = rxp_hdr->len; 488 489 /* Sanity check the RXP header */ 490 if (rxp_hdr->status != RXP_HRXD_OK || 491 buflen > (rx_desc->len - sizeof(*rxp_hdr))) { 492 c2_rx_error(c2_port, elem); 493 continue; 494 } 495 496 /* 497 * Allocate and map a new skb for replenishing the host 498 * RX desc 499 */ 500 if (c2_rx_alloc(c2_port, elem)) { 501 c2_rx_error(c2_port, elem); 502 continue; 503 } 504 505 /* Unmap the old skb */ 506 pci_unmap_single(c2dev->pcidev, mapaddr, maplen, 507 PCI_DMA_FROMDEVICE); 508 509 prefetch(skb->data); 510 511 /* 512 * Skip past the leading 8 bytes comprising of the 513 * "struct c2_rxp_hdr", prepended by the adapter 514 * to the usual Ethernet header ("struct ethhdr"), 515 * to the start of the raw Ethernet packet. 516 * 517 * Fix up the various fields in the sk_buff before 518 * passing it up to netif_rx(). The transfer size 519 * (in bytes) specified by the adapter len field of 520 * the "struct rxp_hdr_t" does NOT include the 521 * "sizeof(struct c2_rxp_hdr)". 522 */ 523 skb->data += sizeof(*rxp_hdr); 524 skb_set_tail_pointer(skb, buflen); 525 skb->len = buflen; 526 skb->protocol = eth_type_trans(skb, netdev); 527 528 netif_rx(skb); 529 530 netdev->stats.rx_packets++; 531 netdev->stats.rx_bytes += buflen; 532 } 533 534 /* Save where we left off */ 535 rx_ring->to_clean = elem; 536 c2dev->cur_rx = elem - rx_ring->start; 537 C2_SET_CUR_RX(c2dev, c2dev->cur_rx); 538 539 spin_unlock_irqrestore(&c2dev->lock, flags); 540} 541 542/* 543 * Handle netisr0 TX & RX interrupts. 544 */ 545static irqreturn_t c2_interrupt(int irq, void *dev_id) 546{ 547 unsigned int netisr0, dmaisr; 548 int handled = 0; 549 struct c2_dev *c2dev = (struct c2_dev *) dev_id; 550 551 /* Process CCILNET interrupts */ 552 netisr0 = readl(c2dev->regs + C2_NISR0); 553 if (netisr0) { 554 555 /* 556 * There is an issue with the firmware that always 557 * provides the status of RX for both TX & RX 558 * interrupts. So process both queues here. 559 */ 560 c2_rx_interrupt(c2dev->netdev); 561 c2_tx_interrupt(c2dev->netdev); 562 563 /* Clear the interrupt */ 564 writel(netisr0, c2dev->regs + C2_NISR0); 565 handled++; 566 } 567 568 /* Process RNIC interrupts */ 569 dmaisr = readl(c2dev->regs + C2_DISR); 570 if (dmaisr) { 571 writel(dmaisr, c2dev->regs + C2_DISR); 572 c2_rnic_interrupt(c2dev); 573 handled++; 574 } 575 576 if (handled) { 577 return IRQ_HANDLED; 578 } else { 579 return IRQ_NONE; 580 } 581} 582 583static int c2_up(struct net_device *netdev) 584{ 585 struct c2_port *c2_port = netdev_priv(netdev); 586 struct c2_dev *c2dev = c2_port->c2dev; 587 struct c2_element *elem; 588 struct c2_rxp_hdr *rxp_hdr; 589 struct in_device *in_dev; 590 size_t rx_size, tx_size; 591 int ret, i; 592 unsigned int netimr0; 593 594 if (netif_msg_ifup(c2_port)) 595 pr_debug("%s: enabling interface\n", netdev->name); 596 597 /* Set the Rx buffer size based on MTU */ 598 c2_set_rxbufsize(c2_port); 599 600 /* Allocate DMA'able memory for Tx/Rx host descriptor rings */ 601 rx_size = c2_port->rx_ring.count * sizeof(struct c2_rx_desc); 602 tx_size = c2_port->tx_ring.count * sizeof(struct c2_tx_desc); 603 604 c2_port->mem_size = tx_size + rx_size; 605 c2_port->mem = pci_alloc_consistent(c2dev->pcidev, c2_port->mem_size, 606 &c2_port->dma); 607 if (c2_port->mem == NULL) { 608 pr_debug("Unable to allocate memory for " 609 "host descriptor rings\n"); 610 return -ENOMEM; 611 } 612 613 memset(c2_port->mem, 0, c2_port->mem_size); 614 615 /* Create the Rx host descriptor ring */ 616 if ((ret = 617 c2_rx_ring_alloc(&c2_port->rx_ring, c2_port->mem, c2_port->dma, 618 c2dev->mmio_rxp_ring))) { 619 pr_debug("Unable to create RX ring\n"); 620 goto bail0; 621 } 622 623 /* Allocate Rx buffers for the host descriptor ring */ 624 if (c2_rx_fill(c2_port)) { 625 pr_debug("Unable to fill RX ring\n"); 626 goto bail1; 627 } 628 629 /* Create the Tx host descriptor ring */ 630 if ((ret = c2_tx_ring_alloc(&c2_port->tx_ring, c2_port->mem + rx_size, 631 c2_port->dma + rx_size, 632 c2dev->mmio_txp_ring))) { 633 pr_debug("Unable to create TX ring\n"); 634 goto bail1; 635 } 636 637 /* Set the TX pointer to where we left off */ 638 c2_port->tx_avail = c2_port->tx_ring.count - 1; 639 c2_port->tx_ring.to_use = c2_port->tx_ring.to_clean = 640 c2_port->tx_ring.start + c2dev->cur_tx; 641 642 /* missing: Initialize MAC */ 643 644 BUG_ON(c2_port->tx_ring.to_use != c2_port->tx_ring.to_clean); 645 646 /* Reset the adapter, ensures the driver is in sync with the RXP */ 647 c2_reset(c2_port); 648 649 /* Reset the READY bit in the sk_buff RXP headers & adapter HRXDQ */ 650 for (i = 0, elem = c2_port->rx_ring.start; i < c2_port->rx_ring.count; 651 i++, elem++) { 652 rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data; 653 rxp_hdr->flags = 0; 654 __raw_writew((__force u16) cpu_to_be16(RXP_HRXD_READY), 655 elem->hw_desc + C2_RXP_FLAGS); 656 } 657 658 /* Enable network packets */ 659 netif_start_queue(netdev); 660 661 /* Enable IRQ */ 662 writel(0, c2dev->regs + C2_IDIS); 663 netimr0 = readl(c2dev->regs + C2_NIMR0); 664 netimr0 &= ~(C2_PCI_HTX_INT | C2_PCI_HRX_INT); 665 writel(netimr0, c2dev->regs + C2_NIMR0); 666 667 /* Tell the stack to ignore arp requests for ipaddrs bound to 668 * other interfaces. This is needed to prevent the host stack 669 * from responding to arp requests to the ipaddr bound on the 670 * rdma interface. 671 */ 672 in_dev = in_dev_get(netdev); 673 IN_DEV_CONF_SET(in_dev, ARP_IGNORE, 1); 674 in_dev_put(in_dev); 675 676 return 0; 677 678 bail1: 679 c2_rx_clean(c2_port); 680 kfree(c2_port->rx_ring.start); 681 682 bail0: 683 pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem, 684 c2_port->dma); 685 686 return ret; 687} 688 689static int c2_down(struct net_device *netdev) 690{ 691 struct c2_port *c2_port = netdev_priv(netdev); 692 struct c2_dev *c2dev = c2_port->c2dev; 693 694 if (netif_msg_ifdown(c2_port)) 695 pr_debug("%s: disabling interface\n", 696 netdev->name); 697 698 /* Wait for all the queued packets to get sent */ 699 c2_tx_interrupt(netdev); 700 701 /* Disable network packets */ 702 netif_stop_queue(netdev); 703 704 /* Disable IRQs by clearing the interrupt mask */ 705 writel(1, c2dev->regs + C2_IDIS); 706 writel(0, c2dev->regs + C2_NIMR0); 707 708 /* missing: Stop transmitter */ 709 710 /* missing: Stop receiver */ 711 712 /* Reset the adapter, ensures the driver is in sync with the RXP */ 713 c2_reset(c2_port); 714 715 /* missing: Turn off LEDs here */ 716 717 /* Free all buffers in the host descriptor rings */ 718 c2_tx_clean(c2_port); 719 c2_rx_clean(c2_port); 720 721 /* Free the host descriptor rings */ 722 kfree(c2_port->rx_ring.start); 723 kfree(c2_port->tx_ring.start); 724 pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem, 725 c2_port->dma); 726 727 return 0; 728} 729 730static void c2_reset(struct c2_port *c2_port) 731{ 732 struct c2_dev *c2dev = c2_port->c2dev; 733 unsigned int cur_rx = c2dev->cur_rx; 734 735 /* Tell the hardware to quiesce */ 736 C2_SET_CUR_RX(c2dev, cur_rx | C2_PCI_HRX_QUI); 737 738 /* 739 * The hardware will reset the C2_PCI_HRX_QUI bit once 740 * the RXP is quiesced. Wait 2 seconds for this. 741 */ 742 ssleep(2); 743 744 cur_rx = C2_GET_CUR_RX(c2dev); 745 746 if (cur_rx & C2_PCI_HRX_QUI) 747 pr_debug("c2_reset: failed to quiesce the hardware!\n"); 748 749 cur_rx &= ~C2_PCI_HRX_QUI; 750 751 c2dev->cur_rx = cur_rx; 752 753 pr_debug("Current RX: %u\n", c2dev->cur_rx); 754} 755 756static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev) 757{ 758 struct c2_port *c2_port = netdev_priv(netdev); 759 struct c2_dev *c2dev = c2_port->c2dev; 760 struct c2_ring *tx_ring = &c2_port->tx_ring; 761 struct c2_element *elem; 762 dma_addr_t mapaddr; 763 u32 maplen; 764 unsigned long flags; 765 unsigned int i; 766 767 spin_lock_irqsave(&c2_port->tx_lock, flags); 768 769 if (unlikely(c2_port->tx_avail < (skb_shinfo(skb)->nr_frags + 1))) { 770 netif_stop_queue(netdev); 771 spin_unlock_irqrestore(&c2_port->tx_lock, flags); 772 773 pr_debug("%s: Tx ring full when queue awake!\n", 774 netdev->name); 775 return NETDEV_TX_BUSY; 776 } 777 778 maplen = skb_headlen(skb); 779 mapaddr = 780 pci_map_single(c2dev->pcidev, skb->data, maplen, PCI_DMA_TODEVICE); 781 782 elem = tx_ring->to_use; 783 elem->skb = skb; 784 elem->mapaddr = mapaddr; 785 elem->maplen = maplen; 786 787 /* Tell HW to xmit */ 788 __raw_writeq((__force u64) cpu_to_be64(mapaddr), 789 elem->hw_desc + C2_TXP_ADDR); 790 __raw_writew((__force u16) cpu_to_be16(maplen), 791 elem->hw_desc + C2_TXP_LEN); 792 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_READY), 793 elem->hw_desc + C2_TXP_FLAGS); 794 795 netdev->stats.tx_packets++; 796 netdev->stats.tx_bytes += maplen; 797 798 /* Loop thru additional data fragments and queue them */ 799 if (skb_shinfo(skb)->nr_frags) { 800 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 801 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 802 maplen = frag->size; 803 mapaddr = 804 pci_map_page(c2dev->pcidev, frag->page, 805 frag->page_offset, maplen, 806 PCI_DMA_TODEVICE); 807 808 elem = elem->next; 809 elem->skb = NULL; 810 elem->mapaddr = mapaddr; 811 elem->maplen = maplen; 812 813 /* Tell HW to xmit */ 814 __raw_writeq((__force u64) cpu_to_be64(mapaddr), 815 elem->hw_desc + C2_TXP_ADDR); 816 __raw_writew((__force u16) cpu_to_be16(maplen), 817 elem->hw_desc + C2_TXP_LEN); 818 __raw_writew((__force u16) cpu_to_be16(TXP_HTXD_READY), 819 elem->hw_desc + C2_TXP_FLAGS); 820 821 netdev->stats.tx_packets++; 822 netdev->stats.tx_bytes += maplen; 823 } 824 } 825 826 tx_ring->to_use = elem->next; 827 c2_port->tx_avail -= (skb_shinfo(skb)->nr_frags + 1); 828 829 if (c2_port->tx_avail <= MAX_SKB_FRAGS + 1) { 830 netif_stop_queue(netdev); 831 if (netif_msg_tx_queued(c2_port)) 832 pr_debug("%s: transmit queue full\n", 833 netdev->name); 834 } 835 836 spin_unlock_irqrestore(&c2_port->tx_lock, flags); 837 838 netdev->trans_start = jiffies; 839 840 return NETDEV_TX_OK; 841} 842 843static void c2_tx_timeout(struct net_device *netdev) 844{ 845 struct c2_port *c2_port = netdev_priv(netdev); 846 847 if (netif_msg_timer(c2_port)) 848 pr_debug("%s: tx timeout\n", netdev->name); 849 850 c2_tx_clean(c2_port); 851} 852 853static int c2_change_mtu(struct net_device *netdev, int new_mtu) 854{ 855 int ret = 0; 856 857 if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU) 858 return -EINVAL; 859 860 netdev->mtu = new_mtu; 861 862 if (netif_running(netdev)) { 863 c2_down(netdev); 864 865 c2_up(netdev); 866 } 867 868 return ret; 869} 870 871static const struct net_device_ops c2_netdev = { 872 .ndo_open = c2_up, 873 .ndo_stop = c2_down, 874 .ndo_start_xmit = c2_xmit_frame, 875 .ndo_tx_timeout = c2_tx_timeout, 876 .ndo_change_mtu = c2_change_mtu, 877 .ndo_set_mac_address = eth_mac_addr, 878 .ndo_validate_addr = eth_validate_addr, 879}; 880 881/* Initialize network device */ 882static struct net_device *c2_devinit(struct c2_dev *c2dev, 883 void __iomem * mmio_addr) 884{ 885 struct c2_port *c2_port = NULL; 886 struct net_device *netdev = alloc_etherdev(sizeof(*c2_port)); 887 888 if (!netdev) { 889 pr_debug("c2_port etherdev alloc failed"); 890 return NULL; 891 } 892 893 SET_NETDEV_DEV(netdev, &c2dev->pcidev->dev); 894 895 netdev->netdev_ops = &c2_netdev; 896 netdev->watchdog_timeo = C2_TX_TIMEOUT; 897 netdev->irq = c2dev->pcidev->irq; 898 899 c2_port = netdev_priv(netdev); 900 c2_port->netdev = netdev; 901 c2_port->c2dev = c2dev; 902 c2_port->msg_enable = netif_msg_init(debug, default_msg); 903 c2_port->tx_ring.count = C2_NUM_TX_DESC; 904 c2_port->rx_ring.count = C2_NUM_RX_DESC; 905 906 spin_lock_init(&c2_port->tx_lock); 907 908 /* Copy our 48-bit ethernet hardware address */ 909 memcpy_fromio(netdev->dev_addr, mmio_addr + C2_REGS_ENADDR, 6); 910 911 /* Validate the MAC address */ 912 if (!is_valid_ether_addr(netdev->dev_addr)) { 913 pr_debug("Invalid MAC Address\n"); 914 c2_print_macaddr(netdev); 915 free_netdev(netdev); 916 return NULL; 917 } 918 919 c2dev->netdev = netdev; 920 921 return netdev; 922} 923 924static int __devinit c2_probe(struct pci_dev *pcidev, 925 const struct pci_device_id *ent) 926{ 927 int ret = 0, i; 928 unsigned long reg0_start, reg0_flags, reg0_len; 929 unsigned long reg2_start, reg2_flags, reg2_len; 930 unsigned long reg4_start, reg4_flags, reg4_len; 931 unsigned kva_map_size; 932 struct net_device *netdev = NULL; 933 struct c2_dev *c2dev = NULL; 934 void __iomem *mmio_regs = NULL; 935 936 printk(KERN_INFO PFX "AMSO1100 Gigabit Ethernet driver v%s loaded\n", 937 DRV_VERSION); 938 939 /* Enable PCI device */ 940 ret = pci_enable_device(pcidev); 941 if (ret) { 942 printk(KERN_ERR PFX "%s: Unable to enable PCI device\n", 943 pci_name(pcidev)); 944 goto bail0; 945 } 946 947 reg0_start = pci_resource_start(pcidev, BAR_0); 948 reg0_len = pci_resource_len(pcidev, BAR_0); 949 reg0_flags = pci_resource_flags(pcidev, BAR_0); 950 951 reg2_start = pci_resource_start(pcidev, BAR_2); 952 reg2_len = pci_resource_len(pcidev, BAR_2); 953 reg2_flags = pci_resource_flags(pcidev, BAR_2); 954 955 reg4_start = pci_resource_start(pcidev, BAR_4); 956 reg4_len = pci_resource_len(pcidev, BAR_4); 957 reg4_flags = pci_resource_flags(pcidev, BAR_4); 958 959 pr_debug("BAR0 size = 0x%lX bytes\n", reg0_len); 960 pr_debug("BAR2 size = 0x%lX bytes\n", reg2_len); 961 pr_debug("BAR4 size = 0x%lX bytes\n", reg4_len); 962 963 /* Make sure PCI base addr are MMIO */ 964 if (!(reg0_flags & IORESOURCE_MEM) || 965 !(reg2_flags & IORESOURCE_MEM) || !(reg4_flags & IORESOURCE_MEM)) { 966 printk(KERN_ERR PFX "PCI regions not an MMIO resource\n"); 967 ret = -ENODEV; 968 goto bail1; 969 } 970 971 /* Check for weird/broken PCI region reporting */ 972 if ((reg0_len < C2_REG0_SIZE) || 973 (reg2_len < C2_REG2_SIZE) || (reg4_len < C2_REG4_SIZE)) { 974 printk(KERN_ERR PFX "Invalid PCI region sizes\n"); 975 ret = -ENODEV; 976 goto bail1; 977 } 978 979 /* Reserve PCI I/O and memory resources */ 980 ret = pci_request_regions(pcidev, DRV_NAME); 981 if (ret) { 982 printk(KERN_ERR PFX "%s: Unable to request regions\n", 983 pci_name(pcidev)); 984 goto bail1; 985 } 986 987 if ((sizeof(dma_addr_t) > 4)) { 988 ret = pci_set_dma_mask(pcidev, DMA_BIT_MASK(64)); 989 if (ret < 0) { 990 printk(KERN_ERR PFX "64b DMA configuration failed\n"); 991 goto bail2; 992 } 993 } else { 994 ret = pci_set_dma_mask(pcidev, DMA_BIT_MASK(32)); 995 if (ret < 0) { 996 printk(KERN_ERR PFX "32b DMA configuration failed\n"); 997 goto bail2; 998 } 999 } 1000 1001 /* Enables bus-mastering on the device */ 1002 pci_set_master(pcidev); 1003 1004 /* Remap the adapter PCI registers in BAR4 */ 1005 mmio_regs = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET, 1006 sizeof(struct c2_adapter_pci_regs)); 1007 if (!mmio_regs) { 1008 printk(KERN_ERR PFX 1009 "Unable to remap adapter PCI registers in BAR4\n"); 1010 ret = -EIO; 1011 goto bail2; 1012 } 1013 1014 /* Validate PCI regs magic */ 1015 for (i = 0; i < sizeof(c2_magic); i++) { 1016 if (c2_magic[i] != readb(mmio_regs + C2_REGS_MAGIC + i)) { 1017 printk(KERN_ERR PFX "Downlevel Firmware boot loader " 1018 "[%d/%Zd: got 0x%x, exp 0x%x]. Use the cc_flash " 1019 "utility to update your boot loader\n", 1020 i + 1, sizeof(c2_magic), 1021 readb(mmio_regs + C2_REGS_MAGIC + i), 1022 c2_magic[i]); 1023 printk(KERN_ERR PFX "Adapter not claimed\n"); 1024 iounmap(mmio_regs); 1025 ret = -EIO; 1026 goto bail2; 1027 } 1028 } 1029 1030 /* Validate the adapter version */ 1031 if (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_VERS)) != C2_VERSION) { 1032 printk(KERN_ERR PFX "Version mismatch " 1033 "[fw=%u, c2=%u], Adapter not claimed\n", 1034 be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_VERS)), 1035 C2_VERSION); 1036 ret = -EINVAL; 1037 iounmap(mmio_regs); 1038 goto bail2; 1039 } 1040 1041 /* Validate the adapter IVN */ 1042 if (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_IVN)) != C2_IVN) { 1043 printk(KERN_ERR PFX "Downlevel FIrmware level. You should be using " 1044 "the OpenIB device support kit. " 1045 "[fw=0x%x, c2=0x%x], Adapter not claimed\n", 1046 be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_IVN)), 1047 C2_IVN); 1048 ret = -EINVAL; 1049 iounmap(mmio_regs); 1050 goto bail2; 1051 } 1052 1053 /* Allocate hardware structure */ 1054 c2dev = (struct c2_dev *) ib_alloc_device(sizeof(*c2dev)); 1055 if (!c2dev) { 1056 printk(KERN_ERR PFX "%s: Unable to alloc hardware struct\n", 1057 pci_name(pcidev)); 1058 ret = -ENOMEM; 1059 iounmap(mmio_regs); 1060 goto bail2; 1061 } 1062 1063 memset(c2dev, 0, sizeof(*c2dev)); 1064 spin_lock_init(&c2dev->lock); 1065 c2dev->pcidev = pcidev; 1066 c2dev->cur_tx = 0; 1067 1068 /* Get the last RX index */ 1069 c2dev->cur_rx = 1070 (be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_HRX_CUR)) - 1071 0xffffc000) / sizeof(struct c2_rxp_desc); 1072 1073 /* Request an interrupt line for the driver */ 1074 ret = request_irq(pcidev->irq, c2_interrupt, IRQF_SHARED, DRV_NAME, c2dev); 1075 if (ret) { 1076 printk(KERN_ERR PFX "%s: requested IRQ %u is busy\n", 1077 pci_name(pcidev), pcidev->irq); 1078 iounmap(mmio_regs); 1079 goto bail3; 1080 } 1081 1082 /* Set driver specific data */ 1083 pci_set_drvdata(pcidev, c2dev); 1084 1085 /* Initialize network device */ 1086 if ((netdev = c2_devinit(c2dev, mmio_regs)) == NULL) { 1087 iounmap(mmio_regs); 1088 goto bail4; 1089 } 1090 1091 /* Save off the actual size prior to unmapping mmio_regs */ 1092 kva_map_size = be32_to_cpu((__force __be32) readl(mmio_regs + C2_REGS_PCI_WINSIZE)); 1093 1094 /* Unmap the adapter PCI registers in BAR4 */ 1095 iounmap(mmio_regs); 1096 1097 /* Register network device */ 1098 ret = register_netdev(netdev); 1099 if (ret) { 1100 printk(KERN_ERR PFX "Unable to register netdev, ret = %d\n", 1101 ret); 1102 goto bail5; 1103 } 1104 1105 /* Disable network packets */ 1106 netif_stop_queue(netdev); 1107 1108 /* Remap the adapter HRXDQ PA space to kernel VA space */ 1109 c2dev->mmio_rxp_ring = ioremap_nocache(reg4_start + C2_RXP_HRXDQ_OFFSET, 1110 C2_RXP_HRXDQ_SIZE); 1111 if (!c2dev->mmio_rxp_ring) { 1112 printk(KERN_ERR PFX "Unable to remap MMIO HRXDQ region\n"); 1113 ret = -EIO; 1114 goto bail6; 1115 } 1116 1117 /* Remap the adapter HTXDQ PA space to kernel VA space */ 1118 c2dev->mmio_txp_ring = ioremap_nocache(reg4_start + C2_TXP_HTXDQ_OFFSET, 1119 C2_TXP_HTXDQ_SIZE); 1120 if (!c2dev->mmio_txp_ring) { 1121 printk(KERN_ERR PFX "Unable to remap MMIO HTXDQ region\n"); 1122 ret = -EIO; 1123 goto bail7; 1124 } 1125 1126 /* Save off the current RX index in the last 4 bytes of the TXP Ring */ 1127 C2_SET_CUR_RX(c2dev, c2dev->cur_rx); 1128 1129 /* Remap the PCI registers in adapter BAR0 to kernel VA space */ 1130 c2dev->regs = ioremap_nocache(reg0_start, reg0_len); 1131 if (!c2dev->regs) { 1132 printk(KERN_ERR PFX "Unable to remap BAR0\n"); 1133 ret = -EIO; 1134 goto bail8; 1135 } 1136 1137 /* Remap the PCI registers in adapter BAR4 to kernel VA space */ 1138 c2dev->pa = reg4_start + C2_PCI_REGS_OFFSET; 1139 c2dev->kva = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET, 1140 kva_map_size); 1141 if (!c2dev->kva) { 1142 printk(KERN_ERR PFX "Unable to remap BAR4\n"); 1143 ret = -EIO; 1144 goto bail9; 1145 } 1146 1147 /* Print out the MAC address */ 1148 c2_print_macaddr(netdev); 1149 1150 ret = c2_rnic_init(c2dev); 1151 if (ret) { 1152 printk(KERN_ERR PFX "c2_rnic_init failed: %d\n", ret); 1153 goto bail10; 1154 } 1155 1156 if (c2_register_device(c2dev)) 1157 goto bail10; 1158 1159 return 0; 1160 1161 bail10: 1162 iounmap(c2dev->kva); 1163 1164 bail9: 1165 iounmap(c2dev->regs); 1166 1167 bail8: 1168 iounmap(c2dev->mmio_txp_ring); 1169 1170 bail7: 1171 iounmap(c2dev->mmio_rxp_ring); 1172 1173 bail6: 1174 unregister_netdev(netdev); 1175 1176 bail5: 1177 free_netdev(netdev); 1178 1179 bail4: 1180 free_irq(pcidev->irq, c2dev); 1181 1182 bail3: 1183 ib_dealloc_device(&c2dev->ibdev); 1184 1185 bail2: 1186 pci_release_regions(pcidev); 1187 1188 bail1: 1189 pci_disable_device(pcidev); 1190 1191 bail0: 1192 return ret; 1193} 1194 1195static void __devexit c2_remove(struct pci_dev *pcidev) 1196{ 1197 struct c2_dev *c2dev = pci_get_drvdata(pcidev); 1198 struct net_device *netdev = c2dev->netdev; 1199 1200 /* Unregister with OpenIB */ 1201 c2_unregister_device(c2dev); 1202 1203 /* Clean up the RNIC resources */ 1204 c2_rnic_term(c2dev); 1205 1206 /* Remove network device from the kernel */ 1207 unregister_netdev(netdev); 1208 1209 /* Free network device */ 1210 free_netdev(netdev); 1211 1212 /* Free the interrupt line */ 1213 free_irq(pcidev->irq, c2dev); 1214 1215 /* missing: Turn LEDs off here */ 1216 1217 /* Unmap adapter PA space */ 1218 iounmap(c2dev->kva); 1219 iounmap(c2dev->regs); 1220 iounmap(c2dev->mmio_txp_ring); 1221 iounmap(c2dev->mmio_rxp_ring); 1222 1223 /* Free the hardware structure */ 1224 ib_dealloc_device(&c2dev->ibdev); 1225 1226 /* Release reserved PCI I/O and memory resources */ 1227 pci_release_regions(pcidev); 1228 1229 /* Disable PCI device */ 1230 pci_disable_device(pcidev); 1231 1232 /* Clear driver specific data */ 1233 pci_set_drvdata(pcidev, NULL); 1234} 1235 1236static struct pci_driver c2_pci_driver = { 1237 .name = DRV_NAME, 1238 .id_table = c2_pci_table, 1239 .probe = c2_probe, 1240 .remove = __devexit_p(c2_remove), 1241}; 1242 1243static int __init c2_init_module(void) 1244{ 1245 return pci_register_driver(&c2_pci_driver); 1246} 1247 1248static void __exit c2_exit_module(void) 1249{ 1250 pci_unregister_driver(&c2_pci_driver); 1251} 1252 1253module_init(c2_init_module); 1254module_exit(c2_exit_module); 1255