1 /* 2 * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC. 3 * 4 * 2005-2010 (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/dma-mapping.h> 26 #include <linux/module.h> 27 #include <linux/uaccess.h> 28 #include <linux/init.h> 29 #include <linux/interrupt.h> 30 #include <linux/netdevice.h> 31 #include <linux/etherdevice.h> 32 #include <linux/ethtool.h> 33 #include <linux/skbuff.h> 34 #include <linux/io.h> 35 #include <linux/crc32.h> 36 #include <linux/mii.h> 37 #include <linux/of_device.h> 38 #include <linux/of_platform.h> 39 #include <linux/slab.h> 40 #include <asm/cacheflush.h> 41 #include <asm/byteorder.h> 42 43 #ifdef CONFIG_SPARC 44 #include <asm/idprom.h> 45 #endif 46 47 #include "greth.h" 48 49 #define GRETH_DEF_MSG_ENABLE \ 50 (NETIF_MSG_DRV | \ 51 NETIF_MSG_PROBE | \ 52 NETIF_MSG_LINK | \ 53 NETIF_MSG_IFDOWN | \ 54 NETIF_MSG_IFUP | \ 55 NETIF_MSG_RX_ERR | \ 56 NETIF_MSG_TX_ERR) 57 58 static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */ 59 module_param(greth_debug, int, 0); 60 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value"); 61 62 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */ 63 static int macaddr[6]; 64 module_param_array(macaddr, int, NULL, 0); 65 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address"); 66 67 static int greth_edcl = 1; 68 module_param(greth_edcl, int, 0); 69 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used."); 70 71 static int greth_open(struct net_device *dev); 72 static netdev_tx_t greth_start_xmit(struct sk_buff *skb, 73 struct net_device *dev); 74 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb, 75 struct net_device *dev); 76 static int greth_rx(struct net_device *dev, int limit); 77 static int greth_rx_gbit(struct net_device *dev, int limit); 78 static void greth_clean_tx(struct net_device *dev); 79 static void greth_clean_tx_gbit(struct net_device *dev); 80 static irqreturn_t greth_interrupt(int irq, void *dev_id); 81 static int greth_close(struct net_device *dev); 82 static int greth_set_mac_add(struct net_device *dev, void *p); 83 static void greth_set_multicast_list(struct net_device *dev); 84 85 #define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a)))) 86 #define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a))) 87 #define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v)))) 88 #define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v)))) 89 90 #define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK) 91 #define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK) 92 #define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK) 93 94 static void greth_print_rx_packet(void *addr, int len) 95 { 96 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1, 97 addr, len, true); 98 } 99 100 static void greth_print_tx_packet(struct sk_buff *skb) 101 { 102 int i; 103 int length; 104 105 if (skb_shinfo(skb)->nr_frags == 0) 106 length = skb->len; 107 else 108 length = skb_headlen(skb); 109 110 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1, 111 skb->data, length, true); 112 113 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 114 115 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1, 116 skb_frag_address(&skb_shinfo(skb)->frags[i]), 117 skb_shinfo(skb)->frags[i].size, true); 118 } 119 } 120 121 static inline void greth_enable_tx(struct greth_private *greth) 122 { 123 wmb(); 124 GRETH_REGORIN(greth->regs->control, GRETH_TXEN); 125 } 126 127 static inline void greth_disable_tx(struct greth_private *greth) 128 { 129 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN); 130 } 131 132 static inline void greth_enable_rx(struct greth_private *greth) 133 { 134 wmb(); 135 GRETH_REGORIN(greth->regs->control, GRETH_RXEN); 136 } 137 138 static inline void greth_disable_rx(struct greth_private *greth) 139 { 140 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN); 141 } 142 143 static inline void greth_enable_irqs(struct greth_private *greth) 144 { 145 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI); 146 } 147 148 static inline void greth_disable_irqs(struct greth_private *greth) 149 { 150 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI)); 151 } 152 153 static inline void greth_write_bd(u32 *bd, u32 val) 154 { 155 __raw_writel(cpu_to_be32(val), bd); 156 } 157 158 static inline u32 greth_read_bd(u32 *bd) 159 { 160 return be32_to_cpu(__raw_readl(bd)); 161 } 162 163 static void greth_clean_rings(struct greth_private *greth) 164 { 165 int i; 166 struct greth_bd *rx_bdp = greth->rx_bd_base; 167 struct greth_bd *tx_bdp = greth->tx_bd_base; 168 169 if (greth->gbit_mac) { 170 171 /* Free and unmap RX buffers */ 172 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) { 173 if (greth->rx_skbuff[i] != NULL) { 174 dev_kfree_skb(greth->rx_skbuff[i]); 175 dma_unmap_single(greth->dev, 176 greth_read_bd(&rx_bdp->addr), 177 MAX_FRAME_SIZE+NET_IP_ALIGN, 178 DMA_FROM_DEVICE); 179 } 180 } 181 182 /* TX buffers */ 183 while (greth->tx_free < GRETH_TXBD_NUM) { 184 185 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last]; 186 int nr_frags = skb_shinfo(skb)->nr_frags; 187 tx_bdp = greth->tx_bd_base + greth->tx_last; 188 greth->tx_last = NEXT_TX(greth->tx_last); 189 190 dma_unmap_single(greth->dev, 191 greth_read_bd(&tx_bdp->addr), 192 skb_headlen(skb), 193 DMA_TO_DEVICE); 194 195 for (i = 0; i < nr_frags; i++) { 196 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 197 tx_bdp = greth->tx_bd_base + greth->tx_last; 198 199 dma_unmap_page(greth->dev, 200 greth_read_bd(&tx_bdp->addr), 201 skb_frag_size(frag), 202 DMA_TO_DEVICE); 203 204 greth->tx_last = NEXT_TX(greth->tx_last); 205 } 206 greth->tx_free += nr_frags+1; 207 dev_kfree_skb(skb); 208 } 209 210 211 } else { /* 10/100 Mbps MAC */ 212 213 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) { 214 kfree(greth->rx_bufs[i]); 215 dma_unmap_single(greth->dev, 216 greth_read_bd(&rx_bdp->addr), 217 MAX_FRAME_SIZE, 218 DMA_FROM_DEVICE); 219 } 220 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) { 221 kfree(greth->tx_bufs[i]); 222 dma_unmap_single(greth->dev, 223 greth_read_bd(&tx_bdp->addr), 224 MAX_FRAME_SIZE, 225 DMA_TO_DEVICE); 226 } 227 } 228 } 229 230 static int greth_init_rings(struct greth_private *greth) 231 { 232 struct sk_buff *skb; 233 struct greth_bd *rx_bd, *tx_bd; 234 u32 dma_addr; 235 int i; 236 237 rx_bd = greth->rx_bd_base; 238 tx_bd = greth->tx_bd_base; 239 240 /* Initialize descriptor rings and buffers */ 241 if (greth->gbit_mac) { 242 243 for (i = 0; i < GRETH_RXBD_NUM; i++) { 244 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN); 245 if (skb == NULL) { 246 if (netif_msg_ifup(greth)) 247 dev_err(greth->dev, "Error allocating DMA ring.\n"); 248 goto cleanup; 249 } 250 skb_reserve(skb, NET_IP_ALIGN); 251 dma_addr = dma_map_single(greth->dev, 252 skb->data, 253 MAX_FRAME_SIZE+NET_IP_ALIGN, 254 DMA_FROM_DEVICE); 255 256 if (dma_mapping_error(greth->dev, dma_addr)) { 257 if (netif_msg_ifup(greth)) 258 dev_err(greth->dev, "Could not create initial DMA mapping\n"); 259 goto cleanup; 260 } 261 greth->rx_skbuff[i] = skb; 262 greth_write_bd(&rx_bd[i].addr, dma_addr); 263 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE); 264 } 265 266 } else { 267 268 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */ 269 for (i = 0; i < GRETH_RXBD_NUM; i++) { 270 271 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL); 272 273 if (greth->rx_bufs[i] == NULL) { 274 if (netif_msg_ifup(greth)) 275 dev_err(greth->dev, "Error allocating DMA ring.\n"); 276 goto cleanup; 277 } 278 279 dma_addr = dma_map_single(greth->dev, 280 greth->rx_bufs[i], 281 MAX_FRAME_SIZE, 282 DMA_FROM_DEVICE); 283 284 if (dma_mapping_error(greth->dev, dma_addr)) { 285 if (netif_msg_ifup(greth)) 286 dev_err(greth->dev, "Could not create initial DMA mapping\n"); 287 goto cleanup; 288 } 289 greth_write_bd(&rx_bd[i].addr, dma_addr); 290 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE); 291 } 292 for (i = 0; i < GRETH_TXBD_NUM; i++) { 293 294 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL); 295 296 if (greth->tx_bufs[i] == NULL) { 297 if (netif_msg_ifup(greth)) 298 dev_err(greth->dev, "Error allocating DMA ring.\n"); 299 goto cleanup; 300 } 301 302 dma_addr = dma_map_single(greth->dev, 303 greth->tx_bufs[i], 304 MAX_FRAME_SIZE, 305 DMA_TO_DEVICE); 306 307 if (dma_mapping_error(greth->dev, dma_addr)) { 308 if (netif_msg_ifup(greth)) 309 dev_err(greth->dev, "Could not create initial DMA mapping\n"); 310 goto cleanup; 311 } 312 greth_write_bd(&tx_bd[i].addr, dma_addr); 313 greth_write_bd(&tx_bd[i].stat, 0); 314 } 315 } 316 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat, 317 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR); 318 319 /* Initialize pointers. */ 320 greth->rx_cur = 0; 321 greth->tx_next = 0; 322 greth->tx_last = 0; 323 greth->tx_free = GRETH_TXBD_NUM; 324 325 /* Initialize descriptor base address */ 326 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys); 327 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys); 328 329 return 0; 330 331 cleanup: 332 greth_clean_rings(greth); 333 return -ENOMEM; 334 } 335 336 static int greth_open(struct net_device *dev) 337 { 338 struct greth_private *greth = netdev_priv(dev); 339 int err; 340 341 err = greth_init_rings(greth); 342 if (err) { 343 if (netif_msg_ifup(greth)) 344 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n"); 345 return err; 346 } 347 348 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev); 349 if (err) { 350 if (netif_msg_ifup(greth)) 351 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq); 352 greth_clean_rings(greth); 353 return err; 354 } 355 356 if (netif_msg_ifup(greth)) 357 dev_dbg(&dev->dev, " starting queue\n"); 358 netif_start_queue(dev); 359 360 GRETH_REGSAVE(greth->regs->status, 0xFF); 361 362 napi_enable(&greth->napi); 363 364 greth_enable_irqs(greth); 365 greth_enable_tx(greth); 366 greth_enable_rx(greth); 367 return 0; 368 369 } 370 371 static int greth_close(struct net_device *dev) 372 { 373 struct greth_private *greth = netdev_priv(dev); 374 375 napi_disable(&greth->napi); 376 377 greth_disable_irqs(greth); 378 greth_disable_tx(greth); 379 greth_disable_rx(greth); 380 381 netif_stop_queue(dev); 382 383 free_irq(greth->irq, (void *) dev); 384 385 greth_clean_rings(greth); 386 387 return 0; 388 } 389 390 static netdev_tx_t 391 greth_start_xmit(struct sk_buff *skb, struct net_device *dev) 392 { 393 struct greth_private *greth = netdev_priv(dev); 394 struct greth_bd *bdp; 395 int err = NETDEV_TX_OK; 396 u32 status, dma_addr, ctrl; 397 unsigned long flags; 398 399 /* Clean TX Ring */ 400 greth_clean_tx(greth->netdev); 401 402 if (unlikely(greth->tx_free <= 0)) { 403 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/ 404 ctrl = GRETH_REGLOAD(greth->regs->control); 405 /* Enable TX IRQ only if not already in poll() routine */ 406 if (ctrl & GRETH_RXI) 407 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI); 408 netif_stop_queue(dev); 409 spin_unlock_irqrestore(&greth->devlock, flags); 410 return NETDEV_TX_BUSY; 411 } 412 413 if (netif_msg_pktdata(greth)) 414 greth_print_tx_packet(skb); 415 416 417 if (unlikely(skb->len > MAX_FRAME_SIZE)) { 418 dev->stats.tx_errors++; 419 goto out; 420 } 421 422 bdp = greth->tx_bd_base + greth->tx_next; 423 dma_addr = greth_read_bd(&bdp->addr); 424 425 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len); 426 427 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE); 428 429 status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN); 430 greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN; 431 432 /* Wrap around descriptor ring */ 433 if (greth->tx_next == GRETH_TXBD_NUM_MASK) { 434 status |= GRETH_BD_WR; 435 } 436 437 greth->tx_next = NEXT_TX(greth->tx_next); 438 greth->tx_free--; 439 440 /* Write descriptor control word and enable transmission */ 441 greth_write_bd(&bdp->stat, status); 442 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/ 443 greth_enable_tx(greth); 444 spin_unlock_irqrestore(&greth->devlock, flags); 445 446 out: 447 dev_kfree_skb(skb); 448 return err; 449 } 450 451 452 static netdev_tx_t 453 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev) 454 { 455 struct greth_private *greth = netdev_priv(dev); 456 struct greth_bd *bdp; 457 u32 status = 0, dma_addr, ctrl; 458 int curr_tx, nr_frags, i, err = NETDEV_TX_OK; 459 unsigned long flags; 460 461 nr_frags = skb_shinfo(skb)->nr_frags; 462 463 /* Clean TX Ring */ 464 greth_clean_tx_gbit(dev); 465 466 if (greth->tx_free < nr_frags + 1) { 467 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/ 468 ctrl = GRETH_REGLOAD(greth->regs->control); 469 /* Enable TX IRQ only if not already in poll() routine */ 470 if (ctrl & GRETH_RXI) 471 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI); 472 netif_stop_queue(dev); 473 spin_unlock_irqrestore(&greth->devlock, flags); 474 err = NETDEV_TX_BUSY; 475 goto out; 476 } 477 478 if (netif_msg_pktdata(greth)) 479 greth_print_tx_packet(skb); 480 481 if (unlikely(skb->len > MAX_FRAME_SIZE)) { 482 dev->stats.tx_errors++; 483 goto out; 484 } 485 486 /* Save skb pointer. */ 487 greth->tx_skbuff[greth->tx_next] = skb; 488 489 /* Linear buf */ 490 if (nr_frags != 0) 491 status = GRETH_TXBD_MORE; 492 493 if (skb->ip_summed == CHECKSUM_PARTIAL) 494 status |= GRETH_TXBD_CSALL; 495 status |= skb_headlen(skb) & GRETH_BD_LEN; 496 if (greth->tx_next == GRETH_TXBD_NUM_MASK) 497 status |= GRETH_BD_WR; 498 499 500 bdp = greth->tx_bd_base + greth->tx_next; 501 greth_write_bd(&bdp->stat, status); 502 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); 503 504 if (unlikely(dma_mapping_error(greth->dev, dma_addr))) 505 goto map_error; 506 507 greth_write_bd(&bdp->addr, dma_addr); 508 509 curr_tx = NEXT_TX(greth->tx_next); 510 511 /* Frags */ 512 for (i = 0; i < nr_frags; i++) { 513 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 514 greth->tx_skbuff[curr_tx] = NULL; 515 bdp = greth->tx_bd_base + curr_tx; 516 517 status = GRETH_BD_EN; 518 if (skb->ip_summed == CHECKSUM_PARTIAL) 519 status |= GRETH_TXBD_CSALL; 520 status |= skb_frag_size(frag) & GRETH_BD_LEN; 521 522 /* Wrap around descriptor ring */ 523 if (curr_tx == GRETH_TXBD_NUM_MASK) 524 status |= GRETH_BD_WR; 525 526 /* More fragments left */ 527 if (i < nr_frags - 1) 528 status |= GRETH_TXBD_MORE; 529 else 530 status |= GRETH_BD_IE; /* enable IRQ on last fragment */ 531 532 greth_write_bd(&bdp->stat, status); 533 534 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag), 535 DMA_TO_DEVICE); 536 537 if (unlikely(dma_mapping_error(greth->dev, dma_addr))) 538 goto frag_map_error; 539 540 greth_write_bd(&bdp->addr, dma_addr); 541 542 curr_tx = NEXT_TX(curr_tx); 543 } 544 545 wmb(); 546 547 /* Enable the descriptor chain by enabling the first descriptor */ 548 bdp = greth->tx_bd_base + greth->tx_next; 549 greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN); 550 greth->tx_next = curr_tx; 551 greth->tx_free -= nr_frags + 1; 552 553 wmb(); 554 555 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/ 556 greth_enable_tx(greth); 557 spin_unlock_irqrestore(&greth->devlock, flags); 558 559 return NETDEV_TX_OK; 560 561 frag_map_error: 562 /* Unmap SKB mappings that succeeded and disable descriptor */ 563 for (i = 0; greth->tx_next + i != curr_tx; i++) { 564 bdp = greth->tx_bd_base + greth->tx_next + i; 565 dma_unmap_single(greth->dev, 566 greth_read_bd(&bdp->addr), 567 greth_read_bd(&bdp->stat) & GRETH_BD_LEN, 568 DMA_TO_DEVICE); 569 greth_write_bd(&bdp->stat, 0); 570 } 571 map_error: 572 if (net_ratelimit()) 573 dev_warn(greth->dev, "Could not create TX DMA mapping\n"); 574 dev_kfree_skb(skb); 575 out: 576 return err; 577 } 578 579 static irqreturn_t greth_interrupt(int irq, void *dev_id) 580 { 581 struct net_device *dev = dev_id; 582 struct greth_private *greth; 583 u32 status, ctrl; 584 irqreturn_t retval = IRQ_NONE; 585 586 greth = netdev_priv(dev); 587 588 spin_lock(&greth->devlock); 589 590 /* Get the interrupt events that caused us to be here. */ 591 status = GRETH_REGLOAD(greth->regs->status); 592 593 /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be 594 * set regardless of whether IRQ is enabled or not. Especially 595 * important when shared IRQ. 596 */ 597 ctrl = GRETH_REGLOAD(greth->regs->control); 598 599 /* Handle rx and tx interrupts through poll */ 600 if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) || 601 ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) { 602 retval = IRQ_HANDLED; 603 604 /* Disable interrupts and schedule poll() */ 605 greth_disable_irqs(greth); 606 napi_schedule(&greth->napi); 607 } 608 609 mmiowb(); 610 spin_unlock(&greth->devlock); 611 612 return retval; 613 } 614 615 static void greth_clean_tx(struct net_device *dev) 616 { 617 struct greth_private *greth; 618 struct greth_bd *bdp; 619 u32 stat; 620 621 greth = netdev_priv(dev); 622 623 while (1) { 624 bdp = greth->tx_bd_base + greth->tx_last; 625 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX); 626 mb(); 627 stat = greth_read_bd(&bdp->stat); 628 629 if (unlikely(stat & GRETH_BD_EN)) 630 break; 631 632 if (greth->tx_free == GRETH_TXBD_NUM) 633 break; 634 635 /* Check status for errors */ 636 if (unlikely(stat & GRETH_TXBD_STATUS)) { 637 dev->stats.tx_errors++; 638 if (stat & GRETH_TXBD_ERR_AL) 639 dev->stats.tx_aborted_errors++; 640 if (stat & GRETH_TXBD_ERR_UE) 641 dev->stats.tx_fifo_errors++; 642 } 643 dev->stats.tx_packets++; 644 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last]; 645 greth->tx_last = NEXT_TX(greth->tx_last); 646 greth->tx_free++; 647 } 648 649 if (greth->tx_free > 0) { 650 netif_wake_queue(dev); 651 } 652 653 } 654 655 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat) 656 { 657 /* Check status for errors */ 658 if (unlikely(stat & GRETH_TXBD_STATUS)) { 659 dev->stats.tx_errors++; 660 if (stat & GRETH_TXBD_ERR_AL) 661 dev->stats.tx_aborted_errors++; 662 if (stat & GRETH_TXBD_ERR_UE) 663 dev->stats.tx_fifo_errors++; 664 if (stat & GRETH_TXBD_ERR_LC) 665 dev->stats.tx_aborted_errors++; 666 } 667 dev->stats.tx_packets++; 668 } 669 670 static void greth_clean_tx_gbit(struct net_device *dev) 671 { 672 struct greth_private *greth; 673 struct greth_bd *bdp, *bdp_last_frag; 674 struct sk_buff *skb; 675 u32 stat; 676 int nr_frags, i; 677 678 greth = netdev_priv(dev); 679 680 while (greth->tx_free < GRETH_TXBD_NUM) { 681 682 skb = greth->tx_skbuff[greth->tx_last]; 683 684 nr_frags = skb_shinfo(skb)->nr_frags; 685 686 /* We only clean fully completed SKBs */ 687 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags); 688 689 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX); 690 mb(); 691 stat = greth_read_bd(&bdp_last_frag->stat); 692 693 if (stat & GRETH_BD_EN) 694 break; 695 696 greth->tx_skbuff[greth->tx_last] = NULL; 697 698 greth_update_tx_stats(dev, stat); 699 dev->stats.tx_bytes += skb->len; 700 701 bdp = greth->tx_bd_base + greth->tx_last; 702 703 greth->tx_last = NEXT_TX(greth->tx_last); 704 705 dma_unmap_single(greth->dev, 706 greth_read_bd(&bdp->addr), 707 skb_headlen(skb), 708 DMA_TO_DEVICE); 709 710 for (i = 0; i < nr_frags; i++) { 711 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 712 bdp = greth->tx_bd_base + greth->tx_last; 713 714 dma_unmap_page(greth->dev, 715 greth_read_bd(&bdp->addr), 716 skb_frag_size(frag), 717 DMA_TO_DEVICE); 718 719 greth->tx_last = NEXT_TX(greth->tx_last); 720 } 721 greth->tx_free += nr_frags+1; 722 dev_kfree_skb(skb); 723 } 724 725 if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1))) 726 netif_wake_queue(dev); 727 } 728 729 static int greth_rx(struct net_device *dev, int limit) 730 { 731 struct greth_private *greth; 732 struct greth_bd *bdp; 733 struct sk_buff *skb; 734 int pkt_len; 735 int bad, count; 736 u32 status, dma_addr; 737 unsigned long flags; 738 739 greth = netdev_priv(dev); 740 741 for (count = 0; count < limit; ++count) { 742 743 bdp = greth->rx_bd_base + greth->rx_cur; 744 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX); 745 mb(); 746 status = greth_read_bd(&bdp->stat); 747 748 if (unlikely(status & GRETH_BD_EN)) { 749 break; 750 } 751 752 dma_addr = greth_read_bd(&bdp->addr); 753 bad = 0; 754 755 /* Check status for errors. */ 756 if (unlikely(status & GRETH_RXBD_STATUS)) { 757 if (status & GRETH_RXBD_ERR_FT) { 758 dev->stats.rx_length_errors++; 759 bad = 1; 760 } 761 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) { 762 dev->stats.rx_frame_errors++; 763 bad = 1; 764 } 765 if (status & GRETH_RXBD_ERR_CRC) { 766 dev->stats.rx_crc_errors++; 767 bad = 1; 768 } 769 } 770 if (unlikely(bad)) { 771 dev->stats.rx_errors++; 772 773 } else { 774 775 pkt_len = status & GRETH_BD_LEN; 776 777 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN); 778 779 if (unlikely(skb == NULL)) { 780 781 if (net_ratelimit()) 782 dev_warn(&dev->dev, "low on memory - " "packet dropped\n"); 783 784 dev->stats.rx_dropped++; 785 786 } else { 787 skb_reserve(skb, NET_IP_ALIGN); 788 skb->dev = dev; 789 790 dma_sync_single_for_cpu(greth->dev, 791 dma_addr, 792 pkt_len, 793 DMA_FROM_DEVICE); 794 795 if (netif_msg_pktdata(greth)) 796 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len); 797 798 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len); 799 800 skb->protocol = eth_type_trans(skb, dev); 801 dev->stats.rx_bytes += pkt_len; 802 dev->stats.rx_packets++; 803 netif_receive_skb(skb); 804 } 805 } 806 807 status = GRETH_BD_EN | GRETH_BD_IE; 808 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) { 809 status |= GRETH_BD_WR; 810 } 811 812 wmb(); 813 greth_write_bd(&bdp->stat, status); 814 815 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE); 816 817 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */ 818 greth_enable_rx(greth); 819 spin_unlock_irqrestore(&greth->devlock, flags); 820 821 greth->rx_cur = NEXT_RX(greth->rx_cur); 822 } 823 824 return count; 825 } 826 827 static inline int hw_checksummed(u32 status) 828 { 829 830 if (status & GRETH_RXBD_IP_FRAG) 831 return 0; 832 833 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR) 834 return 0; 835 836 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR) 837 return 0; 838 839 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR) 840 return 0; 841 842 return 1; 843 } 844 845 static int greth_rx_gbit(struct net_device *dev, int limit) 846 { 847 struct greth_private *greth; 848 struct greth_bd *bdp; 849 struct sk_buff *skb, *newskb; 850 int pkt_len; 851 int bad, count = 0; 852 u32 status, dma_addr; 853 unsigned long flags; 854 855 greth = netdev_priv(dev); 856 857 for (count = 0; count < limit; ++count) { 858 859 bdp = greth->rx_bd_base + greth->rx_cur; 860 skb = greth->rx_skbuff[greth->rx_cur]; 861 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX); 862 mb(); 863 status = greth_read_bd(&bdp->stat); 864 bad = 0; 865 866 if (status & GRETH_BD_EN) 867 break; 868 869 /* Check status for errors. */ 870 if (unlikely(status & GRETH_RXBD_STATUS)) { 871 872 if (status & GRETH_RXBD_ERR_FT) { 873 dev->stats.rx_length_errors++; 874 bad = 1; 875 } else if (status & 876 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) { 877 dev->stats.rx_frame_errors++; 878 bad = 1; 879 } else if (status & GRETH_RXBD_ERR_CRC) { 880 dev->stats.rx_crc_errors++; 881 bad = 1; 882 } 883 } 884 885 /* Allocate new skb to replace current, not needed if the 886 * current skb can be reused */ 887 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) { 888 skb_reserve(newskb, NET_IP_ALIGN); 889 890 dma_addr = dma_map_single(greth->dev, 891 newskb->data, 892 MAX_FRAME_SIZE + NET_IP_ALIGN, 893 DMA_FROM_DEVICE); 894 895 if (!dma_mapping_error(greth->dev, dma_addr)) { 896 /* Process the incoming frame. */ 897 pkt_len = status & GRETH_BD_LEN; 898 899 dma_unmap_single(greth->dev, 900 greth_read_bd(&bdp->addr), 901 MAX_FRAME_SIZE + NET_IP_ALIGN, 902 DMA_FROM_DEVICE); 903 904 if (netif_msg_pktdata(greth)) 905 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len); 906 907 skb_put(skb, pkt_len); 908 909 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status)) 910 skb->ip_summed = CHECKSUM_UNNECESSARY; 911 else 912 skb_checksum_none_assert(skb); 913 914 skb->protocol = eth_type_trans(skb, dev); 915 dev->stats.rx_packets++; 916 dev->stats.rx_bytes += pkt_len; 917 netif_receive_skb(skb); 918 919 greth->rx_skbuff[greth->rx_cur] = newskb; 920 greth_write_bd(&bdp->addr, dma_addr); 921 } else { 922 if (net_ratelimit()) 923 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n"); 924 dev_kfree_skb(newskb); 925 /* reusing current skb, so it is a drop */ 926 dev->stats.rx_dropped++; 927 } 928 } else if (bad) { 929 /* Bad Frame transfer, the skb is reused */ 930 dev->stats.rx_dropped++; 931 } else { 932 /* Failed Allocating a new skb. This is rather stupid 933 * but the current "filled" skb is reused, as if 934 * transfer failure. One could argue that RX descriptor 935 * table handling should be divided into cleaning and 936 * filling as the TX part of the driver 937 */ 938 if (net_ratelimit()) 939 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n"); 940 /* reusing current skb, so it is a drop */ 941 dev->stats.rx_dropped++; 942 } 943 944 status = GRETH_BD_EN | GRETH_BD_IE; 945 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) { 946 status |= GRETH_BD_WR; 947 } 948 949 wmb(); 950 greth_write_bd(&bdp->stat, status); 951 spin_lock_irqsave(&greth->devlock, flags); 952 greth_enable_rx(greth); 953 spin_unlock_irqrestore(&greth->devlock, flags); 954 greth->rx_cur = NEXT_RX(greth->rx_cur); 955 } 956 957 return count; 958 959 } 960 961 static int greth_poll(struct napi_struct *napi, int budget) 962 { 963 struct greth_private *greth; 964 int work_done = 0; 965 unsigned long flags; 966 u32 mask, ctrl; 967 greth = container_of(napi, struct greth_private, napi); 968 969 restart_txrx_poll: 970 if (netif_queue_stopped(greth->netdev)) { 971 if (greth->gbit_mac) 972 greth_clean_tx_gbit(greth->netdev); 973 else 974 greth_clean_tx(greth->netdev); 975 } 976 977 if (greth->gbit_mac) { 978 work_done += greth_rx_gbit(greth->netdev, budget - work_done); 979 } else { 980 work_done += greth_rx(greth->netdev, budget - work_done); 981 } 982 983 if (work_done < budget) { 984 985 spin_lock_irqsave(&greth->devlock, flags); 986 987 ctrl = GRETH_REGLOAD(greth->regs->control); 988 if (netif_queue_stopped(greth->netdev)) { 989 GRETH_REGSAVE(greth->regs->control, 990 ctrl | GRETH_TXI | GRETH_RXI); 991 mask = GRETH_INT_RX | GRETH_INT_RE | 992 GRETH_INT_TX | GRETH_INT_TE; 993 } else { 994 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI); 995 mask = GRETH_INT_RX | GRETH_INT_RE; 996 } 997 998 if (GRETH_REGLOAD(greth->regs->status) & mask) { 999 GRETH_REGSAVE(greth->regs->control, ctrl); 1000 spin_unlock_irqrestore(&greth->devlock, flags); 1001 goto restart_txrx_poll; 1002 } else { 1003 __napi_complete(napi); 1004 spin_unlock_irqrestore(&greth->devlock, flags); 1005 } 1006 } 1007 1008 return work_done; 1009 } 1010 1011 static int greth_set_mac_add(struct net_device *dev, void *p) 1012 { 1013 struct sockaddr *addr = p; 1014 struct greth_private *greth; 1015 struct greth_regs *regs; 1016 1017 greth = netdev_priv(dev); 1018 regs = (struct greth_regs *) greth->regs; 1019 1020 if (!is_valid_ether_addr(addr->sa_data)) 1021 return -EINVAL; 1022 1023 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 1024 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]); 1025 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 | 1026 dev->dev_addr[4] << 8 | dev->dev_addr[5]); 1027 1028 return 0; 1029 } 1030 1031 static u32 greth_hash_get_index(__u8 *addr) 1032 { 1033 return (ether_crc(6, addr)) & 0x3F; 1034 } 1035 1036 static void greth_set_hash_filter(struct net_device *dev) 1037 { 1038 struct netdev_hw_addr *ha; 1039 struct greth_private *greth = netdev_priv(dev); 1040 struct greth_regs *regs = (struct greth_regs *) greth->regs; 1041 u32 mc_filter[2]; 1042 unsigned int bitnr; 1043 1044 mc_filter[0] = mc_filter[1] = 0; 1045 1046 netdev_for_each_mc_addr(ha, dev) { 1047 bitnr = greth_hash_get_index(ha->addr); 1048 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31); 1049 } 1050 1051 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]); 1052 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]); 1053 } 1054 1055 static void greth_set_multicast_list(struct net_device *dev) 1056 { 1057 int cfg; 1058 struct greth_private *greth = netdev_priv(dev); 1059 struct greth_regs *regs = (struct greth_regs *) greth->regs; 1060 1061 cfg = GRETH_REGLOAD(regs->control); 1062 if (dev->flags & IFF_PROMISC) 1063 cfg |= GRETH_CTRL_PR; 1064 else 1065 cfg &= ~GRETH_CTRL_PR; 1066 1067 if (greth->multicast) { 1068 if (dev->flags & IFF_ALLMULTI) { 1069 GRETH_REGSAVE(regs->hash_msb, -1); 1070 GRETH_REGSAVE(regs->hash_lsb, -1); 1071 cfg |= GRETH_CTRL_MCEN; 1072 GRETH_REGSAVE(regs->control, cfg); 1073 return; 1074 } 1075 1076 if (netdev_mc_empty(dev)) { 1077 cfg &= ~GRETH_CTRL_MCEN; 1078 GRETH_REGSAVE(regs->control, cfg); 1079 return; 1080 } 1081 1082 /* Setup multicast filter */ 1083 greth_set_hash_filter(dev); 1084 cfg |= GRETH_CTRL_MCEN; 1085 } 1086 GRETH_REGSAVE(regs->control, cfg); 1087 } 1088 1089 static u32 greth_get_msglevel(struct net_device *dev) 1090 { 1091 struct greth_private *greth = netdev_priv(dev); 1092 return greth->msg_enable; 1093 } 1094 1095 static void greth_set_msglevel(struct net_device *dev, u32 value) 1096 { 1097 struct greth_private *greth = netdev_priv(dev); 1098 greth->msg_enable = value; 1099 } 1100 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1101 { 1102 struct greth_private *greth = netdev_priv(dev); 1103 struct phy_device *phy = greth->phy; 1104 1105 if (!phy) 1106 return -ENODEV; 1107 1108 return phy_ethtool_gset(phy, cmd); 1109 } 1110 1111 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1112 { 1113 struct greth_private *greth = netdev_priv(dev); 1114 struct phy_device *phy = greth->phy; 1115 1116 if (!phy) 1117 return -ENODEV; 1118 1119 return phy_ethtool_sset(phy, cmd); 1120 } 1121 1122 static int greth_get_regs_len(struct net_device *dev) 1123 { 1124 return sizeof(struct greth_regs); 1125 } 1126 1127 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 1128 { 1129 struct greth_private *greth = netdev_priv(dev); 1130 1131 strncpy(info->driver, dev_driver_string(greth->dev), 32); 1132 strncpy(info->version, "revision: 1.0", 32); 1133 strncpy(info->bus_info, greth->dev->bus->name, 32); 1134 strncpy(info->fw_version, "N/A", 32); 1135 info->eedump_len = 0; 1136 info->regdump_len = sizeof(struct greth_regs); 1137 } 1138 1139 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p) 1140 { 1141 int i; 1142 struct greth_private *greth = netdev_priv(dev); 1143 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs; 1144 u32 *buff = p; 1145 1146 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++) 1147 buff[i] = greth_read_bd(&greth_regs[i]); 1148 } 1149 1150 static const struct ethtool_ops greth_ethtool_ops = { 1151 .get_msglevel = greth_get_msglevel, 1152 .set_msglevel = greth_set_msglevel, 1153 .get_settings = greth_get_settings, 1154 .set_settings = greth_set_settings, 1155 .get_drvinfo = greth_get_drvinfo, 1156 .get_regs_len = greth_get_regs_len, 1157 .get_regs = greth_get_regs, 1158 .get_link = ethtool_op_get_link, 1159 }; 1160 1161 static struct net_device_ops greth_netdev_ops = { 1162 .ndo_open = greth_open, 1163 .ndo_stop = greth_close, 1164 .ndo_start_xmit = greth_start_xmit, 1165 .ndo_set_mac_address = greth_set_mac_add, 1166 .ndo_validate_addr = eth_validate_addr, 1167 }; 1168 1169 static inline int wait_for_mdio(struct greth_private *greth) 1170 { 1171 unsigned long timeout = jiffies + 4*HZ/100; 1172 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) { 1173 if (time_after(jiffies, timeout)) 1174 return 0; 1175 } 1176 return 1; 1177 } 1178 1179 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg) 1180 { 1181 struct greth_private *greth = bus->priv; 1182 int data; 1183 1184 if (!wait_for_mdio(greth)) 1185 return -EBUSY; 1186 1187 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2); 1188 1189 if (!wait_for_mdio(greth)) 1190 return -EBUSY; 1191 1192 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) { 1193 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF; 1194 return data; 1195 1196 } else { 1197 return -1; 1198 } 1199 } 1200 1201 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val) 1202 { 1203 struct greth_private *greth = bus->priv; 1204 1205 if (!wait_for_mdio(greth)) 1206 return -EBUSY; 1207 1208 GRETH_REGSAVE(greth->regs->mdio, 1209 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1); 1210 1211 if (!wait_for_mdio(greth)) 1212 return -EBUSY; 1213 1214 return 0; 1215 } 1216 1217 static int greth_mdio_reset(struct mii_bus *bus) 1218 { 1219 return 0; 1220 } 1221 1222 static void greth_link_change(struct net_device *dev) 1223 { 1224 struct greth_private *greth = netdev_priv(dev); 1225 struct phy_device *phydev = greth->phy; 1226 unsigned long flags; 1227 int status_change = 0; 1228 u32 ctrl; 1229 1230 spin_lock_irqsave(&greth->devlock, flags); 1231 1232 if (phydev->link) { 1233 1234 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) { 1235 ctrl = GRETH_REGLOAD(greth->regs->control) & 1236 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB); 1237 1238 if (phydev->duplex) 1239 ctrl |= GRETH_CTRL_FD; 1240 1241 if (phydev->speed == SPEED_100) 1242 ctrl |= GRETH_CTRL_SP; 1243 else if (phydev->speed == SPEED_1000) 1244 ctrl |= GRETH_CTRL_GB; 1245 1246 GRETH_REGSAVE(greth->regs->control, ctrl); 1247 greth->speed = phydev->speed; 1248 greth->duplex = phydev->duplex; 1249 status_change = 1; 1250 } 1251 } 1252 1253 if (phydev->link != greth->link) { 1254 if (!phydev->link) { 1255 greth->speed = 0; 1256 greth->duplex = -1; 1257 } 1258 greth->link = phydev->link; 1259 1260 status_change = 1; 1261 } 1262 1263 spin_unlock_irqrestore(&greth->devlock, flags); 1264 1265 if (status_change) { 1266 if (phydev->link) 1267 pr_debug("%s: link up (%d/%s)\n", 1268 dev->name, phydev->speed, 1269 DUPLEX_FULL == phydev->duplex ? "Full" : "Half"); 1270 else 1271 pr_debug("%s: link down\n", dev->name); 1272 } 1273 } 1274 1275 static int greth_mdio_probe(struct net_device *dev) 1276 { 1277 struct greth_private *greth = netdev_priv(dev); 1278 struct phy_device *phy = NULL; 1279 int ret; 1280 1281 /* Find the first PHY */ 1282 phy = phy_find_first(greth->mdio); 1283 1284 if (!phy) { 1285 if (netif_msg_probe(greth)) 1286 dev_err(&dev->dev, "no PHY found\n"); 1287 return -ENXIO; 1288 } 1289 1290 ret = phy_connect_direct(dev, phy, &greth_link_change, 1291 0, greth->gbit_mac ? 1292 PHY_INTERFACE_MODE_GMII : 1293 PHY_INTERFACE_MODE_MII); 1294 if (ret) { 1295 if (netif_msg_ifup(greth)) 1296 dev_err(&dev->dev, "could not attach to PHY\n"); 1297 return ret; 1298 } 1299 1300 if (greth->gbit_mac) 1301 phy->supported &= PHY_GBIT_FEATURES; 1302 else 1303 phy->supported &= PHY_BASIC_FEATURES; 1304 1305 phy->advertising = phy->supported; 1306 1307 greth->link = 0; 1308 greth->speed = 0; 1309 greth->duplex = -1; 1310 greth->phy = phy; 1311 1312 return 0; 1313 } 1314 1315 static inline int phy_aneg_done(struct phy_device *phydev) 1316 { 1317 int retval; 1318 1319 retval = phy_read(phydev, MII_BMSR); 1320 1321 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); 1322 } 1323 1324 static int greth_mdio_init(struct greth_private *greth) 1325 { 1326 int ret, phy; 1327 unsigned long timeout; 1328 1329 greth->mdio = mdiobus_alloc(); 1330 if (!greth->mdio) { 1331 return -ENOMEM; 1332 } 1333 1334 greth->mdio->name = "greth-mdio"; 1335 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq); 1336 greth->mdio->read = greth_mdio_read; 1337 greth->mdio->write = greth_mdio_write; 1338 greth->mdio->reset = greth_mdio_reset; 1339 greth->mdio->priv = greth; 1340 1341 greth->mdio->irq = greth->mdio_irqs; 1342 1343 for (phy = 0; phy < PHY_MAX_ADDR; phy++) 1344 greth->mdio->irq[phy] = PHY_POLL; 1345 1346 ret = mdiobus_register(greth->mdio); 1347 if (ret) { 1348 goto error; 1349 } 1350 1351 ret = greth_mdio_probe(greth->netdev); 1352 if (ret) { 1353 if (netif_msg_probe(greth)) 1354 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n"); 1355 goto unreg_mdio; 1356 } 1357 1358 phy_start(greth->phy); 1359 1360 /* If Ethernet debug link is used make autoneg happen right away */ 1361 if (greth->edcl && greth_edcl == 1) { 1362 phy_start_aneg(greth->phy); 1363 timeout = jiffies + 6*HZ; 1364 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) { 1365 } 1366 genphy_read_status(greth->phy); 1367 greth_link_change(greth->netdev); 1368 } 1369 1370 return 0; 1371 1372 unreg_mdio: 1373 mdiobus_unregister(greth->mdio); 1374 error: 1375 mdiobus_free(greth->mdio); 1376 return ret; 1377 } 1378 1379 /* Initialize the GRETH MAC */ 1380 static int __devinit greth_of_probe(struct platform_device *ofdev) 1381 { 1382 struct net_device *dev; 1383 struct greth_private *greth; 1384 struct greth_regs *regs; 1385 1386 int i; 1387 int err; 1388 int tmp; 1389 unsigned long timeout; 1390 1391 dev = alloc_etherdev(sizeof(struct greth_private)); 1392 1393 if (dev == NULL) 1394 return -ENOMEM; 1395 1396 greth = netdev_priv(dev); 1397 greth->netdev = dev; 1398 greth->dev = &ofdev->dev; 1399 1400 if (greth_debug > 0) 1401 greth->msg_enable = greth_debug; 1402 else 1403 greth->msg_enable = GRETH_DEF_MSG_ENABLE; 1404 1405 spin_lock_init(&greth->devlock); 1406 1407 greth->regs = of_ioremap(&ofdev->resource[0], 0, 1408 resource_size(&ofdev->resource[0]), 1409 "grlib-greth regs"); 1410 1411 if (greth->regs == NULL) { 1412 if (netif_msg_probe(greth)) 1413 dev_err(greth->dev, "ioremap failure.\n"); 1414 err = -EIO; 1415 goto error1; 1416 } 1417 1418 regs = (struct greth_regs *) greth->regs; 1419 greth->irq = ofdev->archdata.irqs[0]; 1420 1421 dev_set_drvdata(greth->dev, dev); 1422 SET_NETDEV_DEV(dev, greth->dev); 1423 1424 if (netif_msg_probe(greth)) 1425 dev_dbg(greth->dev, "reseting controller.\n"); 1426 1427 /* Reset the controller. */ 1428 GRETH_REGSAVE(regs->control, GRETH_RESET); 1429 1430 /* Wait for MAC to reset itself */ 1431 timeout = jiffies + HZ/100; 1432 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) { 1433 if (time_after(jiffies, timeout)) { 1434 err = -EIO; 1435 if (netif_msg_probe(greth)) 1436 dev_err(greth->dev, "timeout when waiting for reset.\n"); 1437 goto error2; 1438 } 1439 } 1440 1441 /* Get default PHY address */ 1442 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F; 1443 1444 /* Check if we have GBIT capable MAC */ 1445 tmp = GRETH_REGLOAD(regs->control); 1446 greth->gbit_mac = (tmp >> 27) & 1; 1447 1448 /* Check for multicast capability */ 1449 greth->multicast = (tmp >> 25) & 1; 1450 1451 greth->edcl = (tmp >> 31) & 1; 1452 1453 /* If we have EDCL we disable the EDCL speed-duplex FSM so 1454 * it doesn't interfere with the software */ 1455 if (greth->edcl != 0) 1456 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX); 1457 1458 /* Check if MAC can handle MDIO interrupts */ 1459 greth->mdio_int_en = (tmp >> 26) & 1; 1460 1461 err = greth_mdio_init(greth); 1462 if (err) { 1463 if (netif_msg_probe(greth)) 1464 dev_err(greth->dev, "failed to register MDIO bus\n"); 1465 goto error2; 1466 } 1467 1468 /* Allocate TX descriptor ring in coherent memory */ 1469 greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev, 1470 1024, 1471 &greth->tx_bd_base_phys, 1472 GFP_KERNEL); 1473 1474 if (!greth->tx_bd_base) { 1475 if (netif_msg_probe(greth)) 1476 dev_err(&dev->dev, "could not allocate descriptor memory.\n"); 1477 err = -ENOMEM; 1478 goto error3; 1479 } 1480 1481 memset(greth->tx_bd_base, 0, 1024); 1482 1483 /* Allocate RX descriptor ring in coherent memory */ 1484 greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev, 1485 1024, 1486 &greth->rx_bd_base_phys, 1487 GFP_KERNEL); 1488 1489 if (!greth->rx_bd_base) { 1490 if (netif_msg_probe(greth)) 1491 dev_err(greth->dev, "could not allocate descriptor memory.\n"); 1492 err = -ENOMEM; 1493 goto error4; 1494 } 1495 1496 memset(greth->rx_bd_base, 0, 1024); 1497 1498 /* Get MAC address from: module param, OF property or ID prom */ 1499 for (i = 0; i < 6; i++) { 1500 if (macaddr[i] != 0) 1501 break; 1502 } 1503 if (i == 6) { 1504 const unsigned char *addr; 1505 int len; 1506 addr = of_get_property(ofdev->dev.of_node, "local-mac-address", 1507 &len); 1508 if (addr != NULL && len == 6) { 1509 for (i = 0; i < 6; i++) 1510 macaddr[i] = (unsigned int) addr[i]; 1511 } else { 1512 #ifdef CONFIG_SPARC 1513 for (i = 0; i < 6; i++) 1514 macaddr[i] = (unsigned int) idprom->id_ethaddr[i]; 1515 #endif 1516 } 1517 } 1518 1519 for (i = 0; i < 6; i++) 1520 dev->dev_addr[i] = macaddr[i]; 1521 1522 macaddr[5]++; 1523 1524 if (!is_valid_ether_addr(&dev->dev_addr[0])) { 1525 if (netif_msg_probe(greth)) 1526 dev_err(greth->dev, "no valid ethernet address, aborting.\n"); 1527 err = -EINVAL; 1528 goto error5; 1529 } 1530 1531 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]); 1532 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 | 1533 dev->dev_addr[4] << 8 | dev->dev_addr[5]); 1534 1535 /* Clear all pending interrupts except PHY irq */ 1536 GRETH_REGSAVE(regs->status, 0xFF); 1537 1538 if (greth->gbit_mac) { 1539 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | 1540 NETIF_F_RXCSUM; 1541 dev->features = dev->hw_features | NETIF_F_HIGHDMA; 1542 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit; 1543 } 1544 1545 if (greth->multicast) { 1546 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list; 1547 dev->flags |= IFF_MULTICAST; 1548 } else { 1549 dev->flags &= ~IFF_MULTICAST; 1550 } 1551 1552 dev->netdev_ops = &greth_netdev_ops; 1553 dev->ethtool_ops = &greth_ethtool_ops; 1554 1555 err = register_netdev(dev); 1556 if (err) { 1557 if (netif_msg_probe(greth)) 1558 dev_err(greth->dev, "netdevice registration failed.\n"); 1559 goto error5; 1560 } 1561 1562 /* setup NAPI */ 1563 netif_napi_add(dev, &greth->napi, greth_poll, 64); 1564 1565 return 0; 1566 1567 error5: 1568 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys); 1569 error4: 1570 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys); 1571 error3: 1572 mdiobus_unregister(greth->mdio); 1573 error2: 1574 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0])); 1575 error1: 1576 free_netdev(dev); 1577 return err; 1578 } 1579 1580 static int __devexit greth_of_remove(struct platform_device *of_dev) 1581 { 1582 struct net_device *ndev = dev_get_drvdata(&of_dev->dev); 1583 struct greth_private *greth = netdev_priv(ndev); 1584 1585 /* Free descriptor areas */ 1586 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys); 1587 1588 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys); 1589 1590 dev_set_drvdata(&of_dev->dev, NULL); 1591 1592 if (greth->phy) 1593 phy_stop(greth->phy); 1594 mdiobus_unregister(greth->mdio); 1595 1596 unregister_netdev(ndev); 1597 free_netdev(ndev); 1598 1599 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0])); 1600 1601 return 0; 1602 } 1603 1604 static struct of_device_id greth_of_match[] = { 1605 { 1606 .name = "GAISLER_ETHMAC", 1607 }, 1608 { 1609 .name = "01_01d", 1610 }, 1611 {}, 1612 }; 1613 1614 MODULE_DEVICE_TABLE(of, greth_of_match); 1615 1616 static struct platform_driver greth_of_driver = { 1617 .driver = { 1618 .name = "grlib-greth", 1619 .owner = THIS_MODULE, 1620 .of_match_table = greth_of_match, 1621 }, 1622 .probe = greth_of_probe, 1623 .remove = __devexit_p(greth_of_remove), 1624 }; 1625 1626 static int __init greth_init(void) 1627 { 1628 return platform_driver_register(&greth_of_driver); 1629 } 1630 1631 static void __exit greth_cleanup(void) 1632 { 1633 platform_driver_unregister(&greth_of_driver); 1634 } 1635 1636 module_init(greth_init); 1637 module_exit(greth_cleanup); 1638 1639 MODULE_AUTHOR("Aeroflex Gaisler AB."); 1640 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver"); 1641 MODULE_LICENSE("GPL"); 1642