1/* 2 * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC. 3 * 4 * 2005-2009 (c) Aeroflex Gaisler AB 5 * 6 * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs 7 * available in the GRLIB VHDL IP core library. 8 * 9 * Full documentation of both cores can be found here: 10 * http://www.gaisler.com/products/grlib/grip.pdf 11 * 12 * The Gigabit version supports scatter/gather DMA, any alignment of 13 * buffers and checksum offloading. 14 * 15 * This program is free software; you can redistribute it and/or modify it 16 * under the terms of the GNU General Public License as published by the 17 * Free Software Foundation; either version 2 of the License, or (at your 18 * option) any later version. 19 * 20 * Contributors: Kristoffer Glembo 21 * Daniel Hellstrom 22 * Marko Isomaki 23 */ 24 25#include <linux/module.h> 26#include <linux/uaccess.h> 27#include <linux/init.h> 28#include <linux/netdevice.h> 29#include <linux/etherdevice.h> 30#include <linux/ethtool.h> 31#include <linux/skbuff.h> 32#include <linux/io.h> 33#include <linux/crc32.h> 34#include <linux/mii.h> 35#include <linux/of_device.h> 36#include <linux/of_platform.h> 37#include <linux/slab.h> 38#include <asm/cacheflush.h> 39#include <asm/byteorder.h> 40 41#ifdef CONFIG_SPARC 42#include <asm/idprom.h> 43#endif 44 45#include "greth.h" 46 47#define GRETH_DEF_MSG_ENABLE \ 48 (NETIF_MSG_DRV | \ 49 NETIF_MSG_PROBE | \ 50 NETIF_MSG_LINK | \ 51 NETIF_MSG_IFDOWN | \ 52 NETIF_MSG_IFUP | \ 53 NETIF_MSG_RX_ERR | \ 54 NETIF_MSG_TX_ERR) 55 56static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */ 57module_param(greth_debug, int, 0); 58MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value"); 59 60/* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */ 61static int macaddr[6]; 62module_param_array(macaddr, int, NULL, 0); 63MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address"); 64 65static int greth_edcl = 1; 66module_param(greth_edcl, int, 0); 67MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used."); 68 69static int greth_open(struct net_device *dev); 70static netdev_tx_t greth_start_xmit(struct sk_buff *skb, 71 struct net_device *dev); 72static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb, 73 struct net_device *dev); 74static int greth_rx(struct net_device *dev, int limit); 75static int greth_rx_gbit(struct net_device *dev, int limit); 76static void greth_clean_tx(struct net_device *dev); 77static void greth_clean_tx_gbit(struct net_device *dev); 78static irqreturn_t greth_interrupt(int irq, void *dev_id); 79static int greth_close(struct net_device *dev); 80static int greth_set_mac_add(struct net_device *dev, void *p); 81static void greth_set_multicast_list(struct net_device *dev); 82 83#define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a)))) 84#define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a))) 85#define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v)))) 86#define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v)))) 87 88#define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK) 89#define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK) 90#define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK) 91 92static void greth_print_rx_packet(void *addr, int len) 93{ 94 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1, 95 addr, len, true); 96} 97 98static void greth_print_tx_packet(struct sk_buff *skb) 99{ 100 int i; 101 int length; 102 103 if (skb_shinfo(skb)->nr_frags == 0) 104 length = skb->len; 105 else 106 length = skb_headlen(skb); 107 108 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1, 109 skb->data, length, true); 110 111 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 112 113 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1, 114 phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) + 115 skb_shinfo(skb)->frags[i].page_offset, 116 length, true); 117 } 118} 119 120static inline void greth_enable_tx(struct greth_private *greth) 121{ 122 wmb(); 123 GRETH_REGORIN(greth->regs->control, GRETH_TXEN); 124} 125 126static inline void greth_disable_tx(struct greth_private *greth) 127{ 128 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN); 129} 130 131static inline void greth_enable_rx(struct greth_private *greth) 132{ 133 wmb(); 134 GRETH_REGORIN(greth->regs->control, GRETH_RXEN); 135} 136 137static inline void greth_disable_rx(struct greth_private *greth) 138{ 139 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN); 140} 141 142static inline void greth_enable_irqs(struct greth_private *greth) 143{ 144 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI); 145} 146 147static inline void greth_disable_irqs(struct greth_private *greth) 148{ 149 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI)); 150} 151 152static inline void greth_write_bd(u32 *bd, u32 val) 153{ 154 __raw_writel(cpu_to_be32(val), bd); 155} 156 157static inline u32 greth_read_bd(u32 *bd) 158{ 159 return be32_to_cpu(__raw_readl(bd)); 160} 161 162static void greth_clean_rings(struct greth_private *greth) 163{ 164 int i; 165 struct greth_bd *rx_bdp = greth->rx_bd_base; 166 struct greth_bd *tx_bdp = greth->tx_bd_base; 167 168 if (greth->gbit_mac) { 169 170 /* Free and unmap RX buffers */ 171 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) { 172 if (greth->rx_skbuff[i] != NULL) { 173 dev_kfree_skb(greth->rx_skbuff[i]); 174 dma_unmap_single(greth->dev, 175 greth_read_bd(&rx_bdp->addr), 176 MAX_FRAME_SIZE+NET_IP_ALIGN, 177 DMA_FROM_DEVICE); 178 } 179 } 180 181 /* TX buffers */ 182 while (greth->tx_free < GRETH_TXBD_NUM) { 183 184 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last]; 185 int nr_frags = skb_shinfo(skb)->nr_frags; 186 tx_bdp = greth->tx_bd_base + greth->tx_last; 187 greth->tx_last = NEXT_TX(greth->tx_last); 188 189 dma_unmap_single(greth->dev, 190 greth_read_bd(&tx_bdp->addr), 191 skb_headlen(skb), 192 DMA_TO_DEVICE); 193 194 for (i = 0; i < nr_frags; i++) { 195 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 196 tx_bdp = greth->tx_bd_base + greth->tx_last; 197 198 dma_unmap_page(greth->dev, 199 greth_read_bd(&tx_bdp->addr), 200 frag->size, 201 DMA_TO_DEVICE); 202 203 greth->tx_last = NEXT_TX(greth->tx_last); 204 } 205 greth->tx_free += nr_frags+1; 206 dev_kfree_skb(skb); 207 } 208 209 210 } else { /* 10/100 Mbps MAC */ 211 212 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) { 213 kfree(greth->rx_bufs[i]); 214 dma_unmap_single(greth->dev, 215 greth_read_bd(&rx_bdp->addr), 216 MAX_FRAME_SIZE, 217 DMA_FROM_DEVICE); 218 } 219 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) { 220 kfree(greth->tx_bufs[i]); 221 dma_unmap_single(greth->dev, 222 greth_read_bd(&tx_bdp->addr), 223 MAX_FRAME_SIZE, 224 DMA_TO_DEVICE); 225 } 226 } 227} 228 229static int greth_init_rings(struct greth_private *greth) 230{ 231 struct sk_buff *skb; 232 struct greth_bd *rx_bd, *tx_bd; 233 u32 dma_addr; 234 int i; 235 236 rx_bd = greth->rx_bd_base; 237 tx_bd = greth->tx_bd_base; 238 239 /* Initialize descriptor rings and buffers */ 240 if (greth->gbit_mac) { 241 242 for (i = 0; i < GRETH_RXBD_NUM; i++) { 243 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN); 244 if (skb == NULL) { 245 if (netif_msg_ifup(greth)) 246 dev_err(greth->dev, "Error allocating DMA ring.\n"); 247 goto cleanup; 248 } 249 skb_reserve(skb, NET_IP_ALIGN); 250 dma_addr = dma_map_single(greth->dev, 251 skb->data, 252 MAX_FRAME_SIZE+NET_IP_ALIGN, 253 DMA_FROM_DEVICE); 254 255 if (dma_mapping_error(greth->dev, dma_addr)) { 256 if (netif_msg_ifup(greth)) 257 dev_err(greth->dev, "Could not create initial DMA mapping\n"); 258 goto cleanup; 259 } 260 greth->rx_skbuff[i] = skb; 261 greth_write_bd(&rx_bd[i].addr, dma_addr); 262 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE); 263 } 264 265 } else { 266 267 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */ 268 for (i = 0; i < GRETH_RXBD_NUM; i++) { 269 270 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL); 271 272 if (greth->rx_bufs[i] == NULL) { 273 if (netif_msg_ifup(greth)) 274 dev_err(greth->dev, "Error allocating DMA ring.\n"); 275 goto cleanup; 276 } 277 278 dma_addr = dma_map_single(greth->dev, 279 greth->rx_bufs[i], 280 MAX_FRAME_SIZE, 281 DMA_FROM_DEVICE); 282 283 if (dma_mapping_error(greth->dev, dma_addr)) { 284 if (netif_msg_ifup(greth)) 285 dev_err(greth->dev, "Could not create initial DMA mapping\n"); 286 goto cleanup; 287 } 288 greth_write_bd(&rx_bd[i].addr, dma_addr); 289 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE); 290 } 291 for (i = 0; i < GRETH_TXBD_NUM; i++) { 292 293 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL); 294 295 if (greth->tx_bufs[i] == NULL) { 296 if (netif_msg_ifup(greth)) 297 dev_err(greth->dev, "Error allocating DMA ring.\n"); 298 goto cleanup; 299 } 300 301 dma_addr = dma_map_single(greth->dev, 302 greth->tx_bufs[i], 303 MAX_FRAME_SIZE, 304 DMA_TO_DEVICE); 305 306 if (dma_mapping_error(greth->dev, dma_addr)) { 307 if (netif_msg_ifup(greth)) 308 dev_err(greth->dev, "Could not create initial DMA mapping\n"); 309 goto cleanup; 310 } 311 greth_write_bd(&tx_bd[i].addr, dma_addr); 312 greth_write_bd(&tx_bd[i].stat, 0); 313 } 314 } 315 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat, 316 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR); 317 318 /* Initialize pointers. */ 319 greth->rx_cur = 0; 320 greth->tx_next = 0; 321 greth->tx_last = 0; 322 greth->tx_free = GRETH_TXBD_NUM; 323 324 /* Initialize descriptor base address */ 325 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys); 326 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys); 327 328 return 0; 329 330cleanup: 331 greth_clean_rings(greth); 332 return -ENOMEM; 333} 334 335static int greth_open(struct net_device *dev) 336{ 337 struct greth_private *greth = netdev_priv(dev); 338 int err; 339 340 err = greth_init_rings(greth); 341 if (err) { 342 if (netif_msg_ifup(greth)) 343 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n"); 344 return err; 345 } 346 347 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev); 348 if (err) { 349 if (netif_msg_ifup(greth)) 350 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq); 351 greth_clean_rings(greth); 352 return err; 353 } 354 355 if (netif_msg_ifup(greth)) 356 dev_dbg(&dev->dev, " starting queue\n"); 357 netif_start_queue(dev); 358 359 napi_enable(&greth->napi); 360 361 greth_enable_irqs(greth); 362 greth_enable_tx(greth); 363 greth_enable_rx(greth); 364 return 0; 365 366} 367 368static int greth_close(struct net_device *dev) 369{ 370 struct greth_private *greth = netdev_priv(dev); 371 372 napi_disable(&greth->napi); 373 374 greth_disable_tx(greth); 375 376 netif_stop_queue(dev); 377 378 free_irq(greth->irq, (void *) dev); 379 380 greth_clean_rings(greth); 381 382 return 0; 383} 384 385static netdev_tx_t 386greth_start_xmit(struct sk_buff *skb, struct net_device *dev) 387{ 388 struct greth_private *greth = netdev_priv(dev); 389 struct greth_bd *bdp; 390 int err = NETDEV_TX_OK; 391 u32 status, dma_addr; 392 393 bdp = greth->tx_bd_base + greth->tx_next; 394 395 if (unlikely(greth->tx_free <= 0)) { 396 netif_stop_queue(dev); 397 return NETDEV_TX_BUSY; 398 } 399 400 if (netif_msg_pktdata(greth)) 401 greth_print_tx_packet(skb); 402 403 404 if (unlikely(skb->len > MAX_FRAME_SIZE)) { 405 dev->stats.tx_errors++; 406 goto out; 407 } 408 409 dma_addr = greth_read_bd(&bdp->addr); 410 411 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len); 412 413 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE); 414 415 status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN); 416 417 /* Wrap around descriptor ring */ 418 if (greth->tx_next == GRETH_TXBD_NUM_MASK) { 419 status |= GRETH_BD_WR; 420 } 421 422 greth->tx_next = NEXT_TX(greth->tx_next); 423 greth->tx_free--; 424 425 /* No more descriptors */ 426 if (unlikely(greth->tx_free == 0)) { 427 428 /* Free transmitted descriptors */ 429 greth_clean_tx(dev); 430 431 /* If nothing was cleaned, stop queue & wait for irq */ 432 if (unlikely(greth->tx_free == 0)) { 433 status |= GRETH_BD_IE; 434 netif_stop_queue(dev); 435 } 436 } 437 438 /* Write descriptor control word and enable transmission */ 439 greth_write_bd(&bdp->stat, status); 440 greth_enable_tx(greth); 441 442out: 443 dev_kfree_skb(skb); 444 return err; 445} 446 447 448static netdev_tx_t 449greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev) 450{ 451 struct greth_private *greth = netdev_priv(dev); 452 struct greth_bd *bdp; 453 u32 status = 0, dma_addr; 454 int curr_tx, nr_frags, i, err = NETDEV_TX_OK; 455 456 nr_frags = skb_shinfo(skb)->nr_frags; 457 458 if (greth->tx_free < nr_frags + 1) { 459 netif_stop_queue(dev); 460 err = NETDEV_TX_BUSY; 461 goto out; 462 } 463 464 if (netif_msg_pktdata(greth)) 465 greth_print_tx_packet(skb); 466 467 if (unlikely(skb->len > MAX_FRAME_SIZE)) { 468 dev->stats.tx_errors++; 469 goto out; 470 } 471 472 /* Save skb pointer. */ 473 greth->tx_skbuff[greth->tx_next] = skb; 474 475 /* Linear buf */ 476 if (nr_frags != 0) 477 status = GRETH_TXBD_MORE; 478 479 status |= GRETH_TXBD_CSALL; 480 status |= skb_headlen(skb) & GRETH_BD_LEN; 481 if (greth->tx_next == GRETH_TXBD_NUM_MASK) 482 status |= GRETH_BD_WR; 483 484 485 bdp = greth->tx_bd_base + greth->tx_next; 486 greth_write_bd(&bdp->stat, status); 487 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); 488 489 if (unlikely(dma_mapping_error(greth->dev, dma_addr))) 490 goto map_error; 491 492 greth_write_bd(&bdp->addr, dma_addr); 493 494 curr_tx = NEXT_TX(greth->tx_next); 495 496 /* Frags */ 497 for (i = 0; i < nr_frags; i++) { 498 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 499 greth->tx_skbuff[curr_tx] = NULL; 500 bdp = greth->tx_bd_base + curr_tx; 501 502 status = GRETH_TXBD_CSALL; 503 status |= frag->size & GRETH_BD_LEN; 504 505 /* Wrap around descriptor ring */ 506 if (curr_tx == GRETH_TXBD_NUM_MASK) 507 status |= GRETH_BD_WR; 508 509 /* More fragments left */ 510 if (i < nr_frags - 1) 511 status |= GRETH_TXBD_MORE; 512 513 /* ... last fragment, check if out of descriptors */ 514 else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) { 515 516 /* Enable interrupts and stop queue */ 517 status |= GRETH_BD_IE; 518 netif_stop_queue(dev); 519 } 520 521 greth_write_bd(&bdp->stat, status); 522 523 dma_addr = dma_map_page(greth->dev, 524 frag->page, 525 frag->page_offset, 526 frag->size, 527 DMA_TO_DEVICE); 528 529 if (unlikely(dma_mapping_error(greth->dev, dma_addr))) 530 goto frag_map_error; 531 532 greth_write_bd(&bdp->addr, dma_addr); 533 534 curr_tx = NEXT_TX(curr_tx); 535 } 536 537 wmb(); 538 539 /* Enable the descriptors that we configured ... */ 540 for (i = 0; i < nr_frags + 1; i++) { 541 bdp = greth->tx_bd_base + greth->tx_next; 542 greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN); 543 greth->tx_next = NEXT_TX(greth->tx_next); 544 greth->tx_free--; 545 } 546 547 greth_enable_tx(greth); 548 549 return NETDEV_TX_OK; 550 551frag_map_error: 552 /* Unmap SKB mappings that succeeded */ 553 for (i = 0; greth->tx_next + i != curr_tx; i++) { 554 bdp = greth->tx_bd_base + greth->tx_next + i; 555 dma_unmap_single(greth->dev, 556 greth_read_bd(&bdp->addr), 557 greth_read_bd(&bdp->stat) & GRETH_BD_LEN, 558 DMA_TO_DEVICE); 559 } 560map_error: 561 if (net_ratelimit()) 562 dev_warn(greth->dev, "Could not create TX DMA mapping\n"); 563 dev_kfree_skb(skb); 564out: 565 return err; 566} 567 568 569static irqreturn_t greth_interrupt(int irq, void *dev_id) 570{ 571 struct net_device *dev = dev_id; 572 struct greth_private *greth; 573 u32 status; 574 irqreturn_t retval = IRQ_NONE; 575 576 greth = netdev_priv(dev); 577 578 spin_lock(&greth->devlock); 579 580 /* Get the interrupt events that caused us to be here. */ 581 status = GRETH_REGLOAD(greth->regs->status); 582 583 /* Handle rx and tx interrupts through poll */ 584 if (status & (GRETH_INT_RX | GRETH_INT_TX)) { 585 586 /* Clear interrupt status */ 587 GRETH_REGORIN(greth->regs->status, 588 status & (GRETH_INT_RX | GRETH_INT_TX)); 589 590 retval = IRQ_HANDLED; 591 592 /* Disable interrupts and schedule poll() */ 593 greth_disable_irqs(greth); 594 napi_schedule(&greth->napi); 595 } 596 597 mmiowb(); 598 spin_unlock(&greth->devlock); 599 600 return retval; 601} 602 603static void greth_clean_tx(struct net_device *dev) 604{ 605 struct greth_private *greth; 606 struct greth_bd *bdp; 607 u32 stat; 608 609 greth = netdev_priv(dev); 610 611 while (1) { 612 bdp = greth->tx_bd_base + greth->tx_last; 613 stat = greth_read_bd(&bdp->stat); 614 615 if (unlikely(stat & GRETH_BD_EN)) 616 break; 617 618 if (greth->tx_free == GRETH_TXBD_NUM) 619 break; 620 621 /* Check status for errors */ 622 if (unlikely(stat & GRETH_TXBD_STATUS)) { 623 dev->stats.tx_errors++; 624 if (stat & GRETH_TXBD_ERR_AL) 625 dev->stats.tx_aborted_errors++; 626 if (stat & GRETH_TXBD_ERR_UE) 627 dev->stats.tx_fifo_errors++; 628 } 629 dev->stats.tx_packets++; 630 greth->tx_last = NEXT_TX(greth->tx_last); 631 greth->tx_free++; 632 } 633 634 if (greth->tx_free > 0) { 635 netif_wake_queue(dev); 636 } 637 638} 639 640static inline void greth_update_tx_stats(struct net_device *dev, u32 stat) 641{ 642 /* Check status for errors */ 643 if (unlikely(stat & GRETH_TXBD_STATUS)) { 644 dev->stats.tx_errors++; 645 if (stat & GRETH_TXBD_ERR_AL) 646 dev->stats.tx_aborted_errors++; 647 if (stat & GRETH_TXBD_ERR_UE) 648 dev->stats.tx_fifo_errors++; 649 if (stat & GRETH_TXBD_ERR_LC) 650 dev->stats.tx_aborted_errors++; 651 } 652 dev->stats.tx_packets++; 653} 654 655static void greth_clean_tx_gbit(struct net_device *dev) 656{ 657 struct greth_private *greth; 658 struct greth_bd *bdp, *bdp_last_frag; 659 struct sk_buff *skb; 660 u32 stat; 661 int nr_frags, i; 662 663 greth = netdev_priv(dev); 664 665 while (greth->tx_free < GRETH_TXBD_NUM) { 666 667 skb = greth->tx_skbuff[greth->tx_last]; 668 669 nr_frags = skb_shinfo(skb)->nr_frags; 670 671 /* We only clean fully completed SKBs */ 672 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags); 673 stat = bdp_last_frag->stat; 674 675 if (stat & GRETH_BD_EN) 676 break; 677 678 greth->tx_skbuff[greth->tx_last] = NULL; 679 680 greth_update_tx_stats(dev, stat); 681 682 bdp = greth->tx_bd_base + greth->tx_last; 683 684 greth->tx_last = NEXT_TX(greth->tx_last); 685 686 dma_unmap_single(greth->dev, 687 greth_read_bd(&bdp->addr), 688 skb_headlen(skb), 689 DMA_TO_DEVICE); 690 691 for (i = 0; i < nr_frags; i++) { 692 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 693 bdp = greth->tx_bd_base + greth->tx_last; 694 695 dma_unmap_page(greth->dev, 696 greth_read_bd(&bdp->addr), 697 frag->size, 698 DMA_TO_DEVICE); 699 700 greth->tx_last = NEXT_TX(greth->tx_last); 701 } 702 greth->tx_free += nr_frags+1; 703 dev_kfree_skb(skb); 704 } 705 if (greth->tx_free > (MAX_SKB_FRAGS + 1)) { 706 netif_wake_queue(dev); 707 } 708} 709 710static int greth_pending_packets(struct greth_private *greth) 711{ 712 struct greth_bd *bdp; 713 u32 status; 714 bdp = greth->rx_bd_base + greth->rx_cur; 715 status = greth_read_bd(&bdp->stat); 716 if (status & GRETH_BD_EN) 717 return 0; 718 else 719 return 1; 720} 721 722static int greth_rx(struct net_device *dev, int limit) 723{ 724 struct greth_private *greth; 725 struct greth_bd *bdp; 726 struct sk_buff *skb; 727 int pkt_len; 728 int bad, count; 729 u32 status, dma_addr; 730 731 greth = netdev_priv(dev); 732 733 for (count = 0; count < limit; ++count) { 734 735 bdp = greth->rx_bd_base + greth->rx_cur; 736 status = greth_read_bd(&bdp->stat); 737 dma_addr = greth_read_bd(&bdp->addr); 738 bad = 0; 739 740 if (unlikely(status & GRETH_BD_EN)) { 741 break; 742 } 743 744 /* Check status for errors. */ 745 if (unlikely(status & GRETH_RXBD_STATUS)) { 746 if (status & GRETH_RXBD_ERR_FT) { 747 dev->stats.rx_length_errors++; 748 bad = 1; 749 } 750 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) { 751 dev->stats.rx_frame_errors++; 752 bad = 1; 753 } 754 if (status & GRETH_RXBD_ERR_CRC) { 755 dev->stats.rx_crc_errors++; 756 bad = 1; 757 } 758 } 759 if (unlikely(bad)) { 760 dev->stats.rx_errors++; 761 762 } else { 763 764 pkt_len = status & GRETH_BD_LEN; 765 766 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN); 767 768 if (unlikely(skb == NULL)) { 769 770 if (net_ratelimit()) 771 dev_warn(&dev->dev, "low on memory - " "packet dropped\n"); 772 773 dev->stats.rx_dropped++; 774 775 } else { 776 skb_reserve(skb, NET_IP_ALIGN); 777 skb->dev = dev; 778 779 dma_sync_single_for_cpu(greth->dev, 780 dma_addr, 781 pkt_len, 782 DMA_FROM_DEVICE); 783 784 if (netif_msg_pktdata(greth)) 785 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len); 786 787 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len); 788 789 skb->protocol = eth_type_trans(skb, dev); 790 dev->stats.rx_packets++; 791 netif_receive_skb(skb); 792 } 793 } 794 795 status = GRETH_BD_EN | GRETH_BD_IE; 796 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) { 797 status |= GRETH_BD_WR; 798 } 799 800 wmb(); 801 greth_write_bd(&bdp->stat, status); 802 803 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE); 804 805 greth_enable_rx(greth); 806 807 greth->rx_cur = NEXT_RX(greth->rx_cur); 808 } 809 810 return count; 811} 812 813static inline int hw_checksummed(u32 status) 814{ 815 816 if (status & GRETH_RXBD_IP_FRAG) 817 return 0; 818 819 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR) 820 return 0; 821 822 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR) 823 return 0; 824 825 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR) 826 return 0; 827 828 return 1; 829} 830 831static int greth_rx_gbit(struct net_device *dev, int limit) 832{ 833 struct greth_private *greth; 834 struct greth_bd *bdp; 835 struct sk_buff *skb, *newskb; 836 int pkt_len; 837 int bad, count = 0; 838 u32 status, dma_addr; 839 840 greth = netdev_priv(dev); 841 842 for (count = 0; count < limit; ++count) { 843 844 bdp = greth->rx_bd_base + greth->rx_cur; 845 skb = greth->rx_skbuff[greth->rx_cur]; 846 status = greth_read_bd(&bdp->stat); 847 bad = 0; 848 849 if (status & GRETH_BD_EN) 850 break; 851 852 /* Check status for errors. */ 853 if (unlikely(status & GRETH_RXBD_STATUS)) { 854 855 if (status & GRETH_RXBD_ERR_FT) { 856 dev->stats.rx_length_errors++; 857 bad = 1; 858 } else if (status & 859 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) { 860 dev->stats.rx_frame_errors++; 861 bad = 1; 862 } else if (status & GRETH_RXBD_ERR_CRC) { 863 dev->stats.rx_crc_errors++; 864 bad = 1; 865 } 866 } 867 868 /* Allocate new skb to replace current */ 869 newskb = netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN); 870 871 if (!bad && newskb) { 872 skb_reserve(newskb, NET_IP_ALIGN); 873 874 dma_addr = dma_map_single(greth->dev, 875 newskb->data, 876 MAX_FRAME_SIZE + NET_IP_ALIGN, 877 DMA_FROM_DEVICE); 878 879 if (!dma_mapping_error(greth->dev, dma_addr)) { 880 /* Process the incoming frame. */ 881 pkt_len = status & GRETH_BD_LEN; 882 883 dma_unmap_single(greth->dev, 884 greth_read_bd(&bdp->addr), 885 MAX_FRAME_SIZE + NET_IP_ALIGN, 886 DMA_FROM_DEVICE); 887 888 if (netif_msg_pktdata(greth)) 889 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len); 890 891 skb_put(skb, pkt_len); 892 893 if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status)) 894 skb->ip_summed = CHECKSUM_UNNECESSARY; 895 else 896 skb->ip_summed = CHECKSUM_NONE; 897 898 skb->protocol = eth_type_trans(skb, dev); 899 dev->stats.rx_packets++; 900 netif_receive_skb(skb); 901 902 greth->rx_skbuff[greth->rx_cur] = newskb; 903 greth_write_bd(&bdp->addr, dma_addr); 904 } else { 905 if (net_ratelimit()) 906 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n"); 907 dev_kfree_skb(newskb); 908 dev->stats.rx_dropped++; 909 } 910 } else { 911 if (net_ratelimit()) 912 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n"); 913 dev->stats.rx_dropped++; 914 } 915 916 status = GRETH_BD_EN | GRETH_BD_IE; 917 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) { 918 status |= GRETH_BD_WR; 919 } 920 921 wmb(); 922 greth_write_bd(&bdp->stat, status); 923 greth_enable_rx(greth); 924 greth->rx_cur = NEXT_RX(greth->rx_cur); 925 } 926 927 return count; 928 929} 930 931static int greth_poll(struct napi_struct *napi, int budget) 932{ 933 struct greth_private *greth; 934 int work_done = 0; 935 greth = container_of(napi, struct greth_private, napi); 936 937 if (greth->gbit_mac) { 938 greth_clean_tx_gbit(greth->netdev); 939 } else { 940 greth_clean_tx(greth->netdev); 941 } 942 943restart_poll: 944 if (greth->gbit_mac) { 945 work_done += greth_rx_gbit(greth->netdev, budget - work_done); 946 } else { 947 work_done += greth_rx(greth->netdev, budget - work_done); 948 } 949 950 if (work_done < budget) { 951 952 napi_complete(napi); 953 954 if (greth_pending_packets(greth)) { 955 napi_reschedule(napi); 956 goto restart_poll; 957 } 958 } 959 960 greth_enable_irqs(greth); 961 return work_done; 962} 963 964static int greth_set_mac_add(struct net_device *dev, void *p) 965{ 966 struct sockaddr *addr = p; 967 struct greth_private *greth; 968 struct greth_regs *regs; 969 970 greth = netdev_priv(dev); 971 regs = (struct greth_regs *) greth->regs; 972 973 if (!is_valid_ether_addr(addr->sa_data)) 974 return -EINVAL; 975 976 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 977 978 GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]); 979 GRETH_REGSAVE(regs->esa_lsb, 980 addr->sa_data[2] << 24 | addr-> 981 sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]); 982 return 0; 983} 984 985static u32 greth_hash_get_index(__u8 *addr) 986{ 987 return (ether_crc(6, addr)) & 0x3F; 988} 989 990static void greth_set_hash_filter(struct net_device *dev) 991{ 992 struct netdev_hw_addr *ha; 993 struct greth_private *greth = netdev_priv(dev); 994 struct greth_regs *regs = (struct greth_regs *) greth->regs; 995 u32 mc_filter[2]; 996 unsigned int bitnr; 997 998 mc_filter[0] = mc_filter[1] = 0; 999 1000 netdev_for_each_mc_addr(ha, dev) { 1001 bitnr = greth_hash_get_index(ha->addr); 1002 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31); 1003 } 1004 1005 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]); 1006 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]); 1007} 1008 1009static void greth_set_multicast_list(struct net_device *dev) 1010{ 1011 int cfg; 1012 struct greth_private *greth = netdev_priv(dev); 1013 struct greth_regs *regs = (struct greth_regs *) greth->regs; 1014 1015 cfg = GRETH_REGLOAD(regs->control); 1016 if (dev->flags & IFF_PROMISC) 1017 cfg |= GRETH_CTRL_PR; 1018 else 1019 cfg &= ~GRETH_CTRL_PR; 1020 1021 if (greth->multicast) { 1022 if (dev->flags & IFF_ALLMULTI) { 1023 GRETH_REGSAVE(regs->hash_msb, -1); 1024 GRETH_REGSAVE(regs->hash_lsb, -1); 1025 cfg |= GRETH_CTRL_MCEN; 1026 GRETH_REGSAVE(regs->control, cfg); 1027 return; 1028 } 1029 1030 if (netdev_mc_empty(dev)) { 1031 cfg &= ~GRETH_CTRL_MCEN; 1032 GRETH_REGSAVE(regs->control, cfg); 1033 return; 1034 } 1035 1036 /* Setup multicast filter */ 1037 greth_set_hash_filter(dev); 1038 cfg |= GRETH_CTRL_MCEN; 1039 } 1040 GRETH_REGSAVE(regs->control, cfg); 1041} 1042 1043static u32 greth_get_msglevel(struct net_device *dev) 1044{ 1045 struct greth_private *greth = netdev_priv(dev); 1046 return greth->msg_enable; 1047} 1048 1049static void greth_set_msglevel(struct net_device *dev, u32 value) 1050{ 1051 struct greth_private *greth = netdev_priv(dev); 1052 greth->msg_enable = value; 1053} 1054static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1055{ 1056 struct greth_private *greth = netdev_priv(dev); 1057 struct phy_device *phy = greth->phy; 1058 1059 if (!phy) 1060 return -ENODEV; 1061 1062 return phy_ethtool_gset(phy, cmd); 1063} 1064 1065static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1066{ 1067 struct greth_private *greth = netdev_priv(dev); 1068 struct phy_device *phy = greth->phy; 1069 1070 if (!phy) 1071 return -ENODEV; 1072 1073 return phy_ethtool_sset(phy, cmd); 1074} 1075 1076static int greth_get_regs_len(struct net_device *dev) 1077{ 1078 return sizeof(struct greth_regs); 1079} 1080 1081static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 1082{ 1083 struct greth_private *greth = netdev_priv(dev); 1084 1085 strncpy(info->driver, dev_driver_string(greth->dev), 32); 1086 strncpy(info->version, "revision: 1.0", 32); 1087 strncpy(info->bus_info, greth->dev->bus->name, 32); 1088 strncpy(info->fw_version, "N/A", 32); 1089 info->eedump_len = 0; 1090 info->regdump_len = sizeof(struct greth_regs); 1091} 1092 1093static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p) 1094{ 1095 int i; 1096 struct greth_private *greth = netdev_priv(dev); 1097 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs; 1098 u32 *buff = p; 1099 1100 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++) 1101 buff[i] = greth_read_bd(&greth_regs[i]); 1102} 1103 1104static u32 greth_get_rx_csum(struct net_device *dev) 1105{ 1106 struct greth_private *greth = netdev_priv(dev); 1107 return (greth->flags & GRETH_FLAG_RX_CSUM) != 0; 1108} 1109 1110static int greth_set_rx_csum(struct net_device *dev, u32 data) 1111{ 1112 struct greth_private *greth = netdev_priv(dev); 1113 1114 spin_lock_bh(&greth->devlock); 1115 1116 if (data) 1117 greth->flags |= GRETH_FLAG_RX_CSUM; 1118 else 1119 greth->flags &= ~GRETH_FLAG_RX_CSUM; 1120 1121 spin_unlock_bh(&greth->devlock); 1122 1123 return 0; 1124} 1125 1126static u32 greth_get_tx_csum(struct net_device *dev) 1127{ 1128 return (dev->features & NETIF_F_IP_CSUM) != 0; 1129} 1130 1131static int greth_set_tx_csum(struct net_device *dev, u32 data) 1132{ 1133 netif_tx_lock_bh(dev); 1134 ethtool_op_set_tx_csum(dev, data); 1135 netif_tx_unlock_bh(dev); 1136 return 0; 1137} 1138 1139static const struct ethtool_ops greth_ethtool_ops = { 1140 .get_msglevel = greth_get_msglevel, 1141 .set_msglevel = greth_set_msglevel, 1142 .get_settings = greth_get_settings, 1143 .set_settings = greth_set_settings, 1144 .get_drvinfo = greth_get_drvinfo, 1145 .get_regs_len = greth_get_regs_len, 1146 .get_regs = greth_get_regs, 1147 .get_rx_csum = greth_get_rx_csum, 1148 .set_rx_csum = greth_set_rx_csum, 1149 .get_tx_csum = greth_get_tx_csum, 1150 .set_tx_csum = greth_set_tx_csum, 1151 .get_link = ethtool_op_get_link, 1152}; 1153 1154static struct net_device_ops greth_netdev_ops = { 1155 .ndo_open = greth_open, 1156 .ndo_stop = greth_close, 1157 .ndo_start_xmit = greth_start_xmit, 1158 .ndo_set_mac_address = greth_set_mac_add, 1159 .ndo_validate_addr = eth_validate_addr, 1160}; 1161 1162static inline int wait_for_mdio(struct greth_private *greth) 1163{ 1164 unsigned long timeout = jiffies + 4*HZ/100; 1165 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) { 1166 if (time_after(jiffies, timeout)) 1167 return 0; 1168 } 1169 return 1; 1170} 1171 1172static int greth_mdio_read(struct mii_bus *bus, int phy, int reg) 1173{ 1174 struct greth_private *greth = bus->priv; 1175 int data; 1176 1177 if (!wait_for_mdio(greth)) 1178 return -EBUSY; 1179 1180 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2); 1181 1182 if (!wait_for_mdio(greth)) 1183 return -EBUSY; 1184 1185 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) { 1186 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF; 1187 return data; 1188 1189 } else { 1190 return -1; 1191 } 1192} 1193 1194static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val) 1195{ 1196 struct greth_private *greth = bus->priv; 1197 1198 if (!wait_for_mdio(greth)) 1199 return -EBUSY; 1200 1201 GRETH_REGSAVE(greth->regs->mdio, 1202 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1); 1203 1204 if (!wait_for_mdio(greth)) 1205 return -EBUSY; 1206 1207 return 0; 1208} 1209 1210static int greth_mdio_reset(struct mii_bus *bus) 1211{ 1212 return 0; 1213} 1214 1215static void greth_link_change(struct net_device *dev) 1216{ 1217 struct greth_private *greth = netdev_priv(dev); 1218 struct phy_device *phydev = greth->phy; 1219 unsigned long flags; 1220 1221 int status_change = 0; 1222 1223 spin_lock_irqsave(&greth->devlock, flags); 1224 1225 if (phydev->link) { 1226 1227 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) { 1228 1229 GRETH_REGANDIN(greth->regs->control, 1230 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB)); 1231 1232 if (phydev->duplex) 1233 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_FD); 1234 1235 if (phydev->speed == SPEED_100) { 1236 1237 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_SP); 1238 } 1239 1240 else if (phydev->speed == SPEED_1000) 1241 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_GB); 1242 1243 greth->speed = phydev->speed; 1244 greth->duplex = phydev->duplex; 1245 status_change = 1; 1246 } 1247 } 1248 1249 if (phydev->link != greth->link) { 1250 if (!phydev->link) { 1251 greth->speed = 0; 1252 greth->duplex = -1; 1253 } 1254 greth->link = phydev->link; 1255 1256 status_change = 1; 1257 } 1258 1259 spin_unlock_irqrestore(&greth->devlock, flags); 1260 1261 if (status_change) { 1262 if (phydev->link) 1263 pr_debug("%s: link up (%d/%s)\n", 1264 dev->name, phydev->speed, 1265 DUPLEX_FULL == phydev->duplex ? "Full" : "Half"); 1266 else 1267 pr_debug("%s: link down\n", dev->name); 1268 } 1269} 1270 1271static int greth_mdio_probe(struct net_device *dev) 1272{ 1273 struct greth_private *greth = netdev_priv(dev); 1274 struct phy_device *phy = NULL; 1275 int ret; 1276 1277 /* Find the first PHY */ 1278 phy = phy_find_first(greth->mdio); 1279 1280 if (!phy) { 1281 if (netif_msg_probe(greth)) 1282 dev_err(&dev->dev, "no PHY found\n"); 1283 return -ENXIO; 1284 } 1285 1286 ret = phy_connect_direct(dev, phy, &greth_link_change, 1287 0, greth->gbit_mac ? 1288 PHY_INTERFACE_MODE_GMII : 1289 PHY_INTERFACE_MODE_MII); 1290 if (ret) { 1291 if (netif_msg_ifup(greth)) 1292 dev_err(&dev->dev, "could not attach to PHY\n"); 1293 return ret; 1294 } 1295 1296 if (greth->gbit_mac) 1297 phy->supported &= PHY_GBIT_FEATURES; 1298 else 1299 phy->supported &= PHY_BASIC_FEATURES; 1300 1301 phy->advertising = phy->supported; 1302 1303 greth->link = 0; 1304 greth->speed = 0; 1305 greth->duplex = -1; 1306 greth->phy = phy; 1307 1308 return 0; 1309} 1310 1311static inline int phy_aneg_done(struct phy_device *phydev) 1312{ 1313 int retval; 1314 1315 retval = phy_read(phydev, MII_BMSR); 1316 1317 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); 1318} 1319 1320static int greth_mdio_init(struct greth_private *greth) 1321{ 1322 int ret, phy; 1323 unsigned long timeout; 1324 1325 greth->mdio = mdiobus_alloc(); 1326 if (!greth->mdio) { 1327 return -ENOMEM; 1328 } 1329 1330 greth->mdio->name = "greth-mdio"; 1331 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq); 1332 greth->mdio->read = greth_mdio_read; 1333 greth->mdio->write = greth_mdio_write; 1334 greth->mdio->reset = greth_mdio_reset; 1335 greth->mdio->priv = greth; 1336 1337 greth->mdio->irq = greth->mdio_irqs; 1338 1339 for (phy = 0; phy < PHY_MAX_ADDR; phy++) 1340 greth->mdio->irq[phy] = PHY_POLL; 1341 1342 ret = mdiobus_register(greth->mdio); 1343 if (ret) { 1344 goto error; 1345 } 1346 1347 ret = greth_mdio_probe(greth->netdev); 1348 if (ret) { 1349 if (netif_msg_probe(greth)) 1350 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n"); 1351 goto unreg_mdio; 1352 } 1353 1354 phy_start(greth->phy); 1355 1356 /* If Ethernet debug link is used make autoneg happen right away */ 1357 if (greth->edcl && greth_edcl == 1) { 1358 phy_start_aneg(greth->phy); 1359 timeout = jiffies + 6*HZ; 1360 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) { 1361 } 1362 genphy_read_status(greth->phy); 1363 greth_link_change(greth->netdev); 1364 } 1365 1366 return 0; 1367 1368unreg_mdio: 1369 mdiobus_unregister(greth->mdio); 1370error: 1371 mdiobus_free(greth->mdio); 1372 return ret; 1373} 1374 1375/* Initialize the GRETH MAC */ 1376static int __devinit greth_of_probe(struct platform_device *ofdev, const struct of_device_id *match) 1377{ 1378 struct net_device *dev; 1379 struct greth_private *greth; 1380 struct greth_regs *regs; 1381 1382 int i; 1383 int err; 1384 int tmp; 1385 unsigned long timeout; 1386 1387 dev = alloc_etherdev(sizeof(struct greth_private)); 1388 1389 if (dev == NULL) 1390 return -ENOMEM; 1391 1392 greth = netdev_priv(dev); 1393 greth->netdev = dev; 1394 greth->dev = &ofdev->dev; 1395 1396 if (greth_debug > 0) 1397 greth->msg_enable = greth_debug; 1398 else 1399 greth->msg_enable = GRETH_DEF_MSG_ENABLE; 1400 1401 spin_lock_init(&greth->devlock); 1402 1403 greth->regs = of_ioremap(&ofdev->resource[0], 0, 1404 resource_size(&ofdev->resource[0]), 1405 "grlib-greth regs"); 1406 1407 if (greth->regs == NULL) { 1408 if (netif_msg_probe(greth)) 1409 dev_err(greth->dev, "ioremap failure.\n"); 1410 err = -EIO; 1411 goto error1; 1412 } 1413 1414 regs = (struct greth_regs *) greth->regs; 1415 greth->irq = ofdev->archdata.irqs[0]; 1416 1417 dev_set_drvdata(greth->dev, dev); 1418 SET_NETDEV_DEV(dev, greth->dev); 1419 1420 if (netif_msg_probe(greth)) 1421 dev_dbg(greth->dev, "reseting controller.\n"); 1422 1423 /* Reset the controller. */ 1424 GRETH_REGSAVE(regs->control, GRETH_RESET); 1425 1426 /* Wait for MAC to reset itself */ 1427 timeout = jiffies + HZ/100; 1428 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) { 1429 if (time_after(jiffies, timeout)) { 1430 err = -EIO; 1431 if (netif_msg_probe(greth)) 1432 dev_err(greth->dev, "timeout when waiting for reset.\n"); 1433 goto error2; 1434 } 1435 } 1436 1437 /* Get default PHY address */ 1438 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F; 1439 1440 /* Check if we have GBIT capable MAC */ 1441 tmp = GRETH_REGLOAD(regs->control); 1442 greth->gbit_mac = (tmp >> 27) & 1; 1443 1444 /* Check for multicast capability */ 1445 greth->multicast = (tmp >> 25) & 1; 1446 1447 greth->edcl = (tmp >> 31) & 1; 1448 1449 /* If we have EDCL we disable the EDCL speed-duplex FSM so 1450 * it doesn't interfere with the software */ 1451 if (greth->edcl != 0) 1452 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX); 1453 1454 /* Check if MAC can handle MDIO interrupts */ 1455 greth->mdio_int_en = (tmp >> 26) & 1; 1456 1457 err = greth_mdio_init(greth); 1458 if (err) { 1459 if (netif_msg_probe(greth)) 1460 dev_err(greth->dev, "failed to register MDIO bus\n"); 1461 goto error2; 1462 } 1463 1464 /* Allocate TX descriptor ring in coherent memory */ 1465 greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev, 1466 1024, 1467 &greth->tx_bd_base_phys, 1468 GFP_KERNEL); 1469 1470 if (!greth->tx_bd_base) { 1471 if (netif_msg_probe(greth)) 1472 dev_err(&dev->dev, "could not allocate descriptor memory.\n"); 1473 err = -ENOMEM; 1474 goto error3; 1475 } 1476 1477 memset(greth->tx_bd_base, 0, 1024); 1478 1479 /* Allocate RX descriptor ring in coherent memory */ 1480 greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev, 1481 1024, 1482 &greth->rx_bd_base_phys, 1483 GFP_KERNEL); 1484 1485 if (!greth->rx_bd_base) { 1486 if (netif_msg_probe(greth)) 1487 dev_err(greth->dev, "could not allocate descriptor memory.\n"); 1488 err = -ENOMEM; 1489 goto error4; 1490 } 1491 1492 memset(greth->rx_bd_base, 0, 1024); 1493 1494 /* Get MAC address from: module param, OF property or ID prom */ 1495 for (i = 0; i < 6; i++) { 1496 if (macaddr[i] != 0) 1497 break; 1498 } 1499 if (i == 6) { 1500 const unsigned char *addr; 1501 int len; 1502 addr = of_get_property(ofdev->dev.of_node, "local-mac-address", 1503 &len); 1504 if (addr != NULL && len == 6) { 1505 for (i = 0; i < 6; i++) 1506 macaddr[i] = (unsigned int) addr[i]; 1507 } else { 1508#ifdef CONFIG_SPARC 1509 for (i = 0; i < 6; i++) 1510 macaddr[i] = (unsigned int) idprom->id_ethaddr[i]; 1511#endif 1512 } 1513 } 1514 1515 for (i = 0; i < 6; i++) 1516 dev->dev_addr[i] = macaddr[i]; 1517 1518 macaddr[5]++; 1519 1520 if (!is_valid_ether_addr(&dev->dev_addr[0])) { 1521 if (netif_msg_probe(greth)) 1522 dev_err(greth->dev, "no valid ethernet address, aborting.\n"); 1523 err = -EINVAL; 1524 goto error5; 1525 } 1526 1527 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]); 1528 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 | 1529 dev->dev_addr[4] << 8 | dev->dev_addr[5]); 1530 1531 /* Clear all pending interrupts except PHY irq */ 1532 GRETH_REGSAVE(regs->status, 0xFF); 1533 1534 if (greth->gbit_mac) { 1535 dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA; 1536 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit; 1537 greth->flags = GRETH_FLAG_RX_CSUM; 1538 } 1539 1540 if (greth->multicast) { 1541 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list; 1542 dev->flags |= IFF_MULTICAST; 1543 } else { 1544 dev->flags &= ~IFF_MULTICAST; 1545 } 1546 1547 dev->netdev_ops = &greth_netdev_ops; 1548 dev->ethtool_ops = &greth_ethtool_ops; 1549 1550 if (register_netdev(dev)) { 1551 if (netif_msg_probe(greth)) 1552 dev_err(greth->dev, "netdevice registration failed.\n"); 1553 err = -ENOMEM; 1554 goto error5; 1555 } 1556 1557 /* setup NAPI */ 1558 netif_napi_add(dev, &greth->napi, greth_poll, 64); 1559 1560 return 0; 1561 1562error5: 1563 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys); 1564error4: 1565 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys); 1566error3: 1567 mdiobus_unregister(greth->mdio); 1568error2: 1569 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0])); 1570error1: 1571 free_netdev(dev); 1572 return err; 1573} 1574 1575static int __devexit greth_of_remove(struct platform_device *of_dev) 1576{ 1577 struct net_device *ndev = dev_get_drvdata(&of_dev->dev); 1578 struct greth_private *greth = netdev_priv(ndev); 1579 1580 /* Free descriptor areas */ 1581 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys); 1582 1583 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys); 1584 1585 dev_set_drvdata(&of_dev->dev, NULL); 1586 1587 if (greth->phy) 1588 phy_stop(greth->phy); 1589 mdiobus_unregister(greth->mdio); 1590 1591 unregister_netdev(ndev); 1592 free_netdev(ndev); 1593 1594 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0])); 1595 1596 return 0; 1597} 1598 1599static struct of_device_id greth_of_match[] = { 1600 { 1601 .name = "GAISLER_ETHMAC", 1602 }, 1603 {}, 1604}; 1605 1606MODULE_DEVICE_TABLE(of, greth_of_match); 1607 1608static struct of_platform_driver greth_of_driver = { 1609 .driver = { 1610 .name = "grlib-greth", 1611 .owner = THIS_MODULE, 1612 .of_match_table = greth_of_match, 1613 }, 1614 .probe = greth_of_probe, 1615 .remove = __devexit_p(greth_of_remove), 1616}; 1617 1618static int __init greth_init(void) 1619{ 1620 return of_register_platform_driver(&greth_of_driver); 1621} 1622 1623static void __exit greth_cleanup(void) 1624{ 1625 of_unregister_platform_driver(&greth_of_driver); 1626} 1627 1628module_init(greth_init); 1629module_exit(greth_cleanup); 1630 1631MODULE_AUTHOR("Aeroflex Gaisler AB."); 1632MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver"); 1633MODULE_LICENSE("GPL"); 1634