drivers/net/gianfar.c

   1 /*
   2  * drivers/net/gianfar.c
   3  *
   4  * Gianfar Ethernet Driver
   5  * This driver is designed for the non-CPM ethernet controllers
   6  * on the 85xx and 83xx family of integrated processors
   7  * Based on 8260_io/fcc_enet.c
   8  *
   9  * Author: Andy Fleming
  10  * Maintainer: Kumar Gala
  11  *
  12  * Copyright (c) 2002-2006 Freescale Semiconductor, Inc.
  13  * Copyright (c) 2007 MontaVista Software, Inc.
  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  *  Gianfar:  AKA Lambda Draconis, "Dragon"
  21  *  RA 11 31 24.2
  22  *  Dec +69 19 52
  23  *  V 3.84
  24  *  B-V +1.62
  25  *
  26  *  Theory of operation
  27  *
  28  *  The driver is initialized through of_device. Configuration information
  29  *  is therefore conveyed through an OF-style device tree.
  30  *
  31  *  The Gianfar Ethernet Controller uses a ring of buffer
  32  *  descriptors.  The beginning is indicated by a register
  33  *  pointing to the physical address of the start of the ring.
  34  *  The end is determined by a "wrap" bit being set in the
  35  *  last descriptor of the ring.
  36  *
  37  *  When a packet is received, the RXF bit in the
  38  *  IEVENT register is set, triggering an interrupt when the
  39  *  corresponding bit in the IMASK register is also set (if
  40  *  interrupt coalescing is active, then the interrupt may not
  41  *  happen immediately, but will wait until either a set number
  42  *  of frames or amount of time have passed).  In NAPI, the
  43  *  interrupt handler will signal there is work to be done, and
  44  *  exit. This method will start at the last known empty
  45  *  descriptor, and process every subsequent descriptor until there
  46  *  are none left with data (NAPI will stop after a set number of
  47  *  packets to give time to other tasks, but will eventually
  48  *  process all the packets).  The data arrives inside a
  49  *  pre-allocated skb, and so after the skb is passed up to the
  50  *  stack, a new skb must be allocated, and the address field in
  51  *  the buffer descriptor must be updated to indicate this new
  52  *  skb.
  53  *
  54  *  When the kernel requests that a packet be transmitted, the
  55  *  driver starts where it left off last time, and points the
  56  *  descriptor at the buffer which was passed in.  The driver
  57  *  then informs the DMA engine that there are packets ready to
  58  *  be transmitted.  Once the controller is finished transmitting
  59  *  the packet, an interrupt may be triggered (under the same
  60  *  conditions as for reception, but depending on the TXF bit).
  61  *  The driver then cleans up the buffer.
  62  */
  63
  64 #include <linux/kernel.h>
  65 #include <linux/string.h>
  66 #include <linux/errno.h>
  67 #include <linux/unistd.h>
  68 #include <linux/slab.h>
  69 #include <linux/interrupt.h>
  70 #include <linux/init.h>
  71 #include <linux/delay.h>
  72 #include <linux/netdevice.h>
  73 #include <linux/etherdevice.h>
  74 #include <linux/skbuff.h>
  75 #include <linux/if_vlan.h>
  76 #include <linux/spinlock.h>
  77 #include <linux/mm.h>
  78 #include <linux/of_platform.h>
  79 #include <linux/ip.h>
  80 #include <linux/tcp.h>
  81 #include <linux/udp.h>
  82 #include <linux/in.h>
  83
  84 #include <asm/io.h>
  85 #include <asm/irq.h>
  86 #include <asm/uaccess.h>
  87 #include <linux/module.h>
  88 #include <linux/dma-mapping.h>
  89 #include <linux/crc32.h>
  90 #include <linux/mii.h>
  91 #include <linux/phy.h>
  92 #include <linux/phy_fixed.h>
  93 #include <linux/of.h>
  94
  95 #include "gianfar.h"
  96 #include "gianfar_mii.h"
  97
  98 #define TX_TIMEOUT      (1*HZ)
  99 #undef BRIEF_GFAR_ERRORS
 100 #undef VERBOSE_GFAR_ERRORS
 101
 102 const char gfar_driver_name[] = "Gianfar Ethernet";
 103 const char gfar_driver_version[] = "1.3";
 104
 105 static int gfar_enet_open(struct net_device *dev);
 106 static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev);
 107 static void gfar_reset_task(struct work_struct *work);
 108 static void gfar_timeout(struct net_device *dev);
 109 static int gfar_close(struct net_device *dev);
 110 struct sk_buff *gfar_new_skb(struct net_device *dev);
 111 static void gfar_new_rxbdp(struct net_device *dev, struct rxbd8 *bdp,
 112                 struct sk_buff *skb);
 113 static int gfar_set_mac_address(struct net_device *dev);
 114 static int gfar_change_mtu(struct net_device *dev, int new_mtu);
 115 static irqreturn_t gfar_error(int irq, void *dev_id);
 116 static irqreturn_t gfar_transmit(int irq, void *dev_id);
 117 static irqreturn_t gfar_interrupt(int irq, void *dev_id);
 118 static void adjust_link(struct net_device *dev);
 119 static void init_registers(struct net_device *dev);
 120 static int init_phy(struct net_device *dev);
 121 static int gfar_probe(struct of_device *ofdev,
 122                 const struct of_device_id *match);
 123 static int gfar_remove(struct of_device *ofdev);
 124 static void free_skb_resources(struct gfar_private *priv);
 125 static void gfar_set_multi(struct net_device *dev);
 126 static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr);
 127 static void gfar_configure_serdes(struct net_device *dev);
 128 static int gfar_poll(struct napi_struct *napi, int budget);
 129 #ifdef CONFIG_NET_POLL_CONTROLLER
 130 static void gfar_netpoll(struct net_device *dev);
 131 #endif
 132 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit);
 133 static int gfar_clean_tx_ring(struct net_device *dev);
 134 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb, int length);
 135 static void gfar_vlan_rx_register(struct net_device *netdev,
 136                                 struct vlan_group *grp);
 137 void gfar_halt(struct net_device *dev);
 138 static void gfar_halt_nodisable(struct net_device *dev);
 139 void gfar_start(struct net_device *dev);
 140 static void gfar_clear_exact_match(struct net_device *dev);
 141 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr);
 142
 143 extern const struct ethtool_ops gfar_ethtool_ops;
 144
 145 MODULE_AUTHOR("Freescale Semiconductor, Inc");
 146 MODULE_DESCRIPTION("Gianfar Ethernet Driver");
 147 MODULE_LICENSE("GPL");
 148
 149 /* Returns 1 if incoming frames use an FCB */
 150 static inline int gfar_uses_fcb(struct gfar_private *priv)
 151 {
 152         return priv->vlgrp || priv->rx_csum_enable;
 153 }
 154
 155 static int gfar_of_init(struct net_device *dev)
 156 {
 157         struct device_node *phy, *mdio;
 158         const unsigned int *id;
 159         const char *model;
 160         const char *ctype;
 161         const void *mac_addr;
 162         const phandle *ph;
 163         u64 addr, size;
 164         int err = 0;
 165         struct gfar_private *priv = netdev_priv(dev);
 166         struct device_node *np = priv->node;
 167         char bus_name[MII_BUS_ID_SIZE];
 168
 169         if (!np || !of_device_is_available(np))
 170                 return -ENODEV;
 171
 172         /* get a pointer to the register memory */
 173         addr = of_translate_address(np, of_get_address(np, 0, &size, NULL));
 174         priv->regs = ioremap(addr, size);
 175
 176         if (priv->regs == NULL)
 177                 return -ENOMEM;
 178
 179         priv->interruptTransmit = irq_of_parse_and_map(np, 0);
 180
 181         model = of_get_property(np, "model", NULL);
 182
 183         /* If we aren't the FEC we have multiple interrupts */
 184         if (model && strcasecmp(model, "FEC")) {
 185                 priv->interruptReceive = irq_of_parse_and_map(np, 1);
 186
 187                 priv->interruptError = irq_of_parse_and_map(np, 2);
 188
 189                 if (priv->interruptTransmit < 0 ||
 190                                 priv->interruptReceive < 0 ||
 191                                 priv->interruptError < 0) {
 192                         err = -EINVAL;
 193                         goto err_out;
 194                 }
 195         }
 196
 197         mac_addr = of_get_mac_address(np);
 198         if (mac_addr)
 199                 memcpy(dev->dev_addr, mac_addr, MAC_ADDR_LEN);
 200
 201         if (model && !strcasecmp(model, "TSEC"))
 202                 priv->device_flags =
 203                         FSL_GIANFAR_DEV_HAS_GIGABIT |
 204                         FSL_GIANFAR_DEV_HAS_COALESCE |
 205                         FSL_GIANFAR_DEV_HAS_RMON |
 206                         FSL_GIANFAR_DEV_HAS_MULTI_INTR;
 207         if (model && !strcasecmp(model, "eTSEC"))
 208                 priv->device_flags =
 209                         FSL_GIANFAR_DEV_HAS_GIGABIT |
 210                         FSL_GIANFAR_DEV_HAS_COALESCE |
 211                         FSL_GIANFAR_DEV_HAS_RMON |
 212                         FSL_GIANFAR_DEV_HAS_MULTI_INTR |
 213                         FSL_GIANFAR_DEV_HAS_CSUM |
 214                         FSL_GIANFAR_DEV_HAS_VLAN |
 215                         FSL_GIANFAR_DEV_HAS_MAGIC_PACKET |
 216                         FSL_GIANFAR_DEV_HAS_EXTENDED_HASH;
 217
 218         ctype = of_get_property(np, "phy-connection-type", NULL);
 219
 220         /* We only care about rgmii-id.  The rest are autodetected */
 221         if (ctype && !strcmp(ctype, "rgmii-id"))
 222                 priv->interface = PHY_INTERFACE_MODE_RGMII_ID;
 223         else
 224                 priv->interface = PHY_INTERFACE_MODE_MII;
 225
 226         if (of_get_property(np, "fsl,magic-packet", NULL))
 227                 priv->device_flags |= FSL_GIANFAR_DEV_HAS_MAGIC_PACKET;
 228
 229         ph = of_get_property(np, "phy-handle", NULL);
 230         if (ph == NULL) {
 231                 u32 *fixed_link;
 232
 233                 fixed_link = (u32 *)of_get_property(np, "fixed-link", NULL);
 234                 if (!fixed_link) {
 235                         err = -ENODEV;
 236                         goto err_out;
 237                 }
 238
 239                 snprintf(priv->phy_bus_id, BUS_ID_SIZE, PHY_ID_FMT, "0",
 240                                 fixed_link[0]);
 241         } else {
 242                 phy = of_find_node_by_phandle(*ph);
 243
 244                 if (phy == NULL) {
 245                         err = -ENODEV;
 246                         goto err_out;
 247                 }
 248
 249                 mdio = of_get_parent(phy);
 250
 251                 id = of_get_property(phy, "reg", NULL);
 252
 253                 of_node_put(phy);
 254                 of_node_put(mdio);
 255
 256                 gfar_mdio_bus_name(bus_name, mdio);
 257                 snprintf(priv->phy_bus_id, BUS_ID_SIZE, "%s:%02x",
 258                                 bus_name, *id);
 259         }
 260
 261         /* Find the TBI PHY.  If it's not there, we don't support SGMII */
 262         ph = of_get_property(np, "tbi-handle", NULL);
 263         if (ph) {
 264                 struct device_node *tbi = of_find_node_by_phandle(*ph);
 265                 struct of_device *ofdev;
 266                 struct mii_bus *bus;
 267
 268                 if (!tbi)
 269                         return 0;
 270
 271                 mdio = of_get_parent(tbi);
 272                 if (!mdio)
 273                         return 0;
 274
 275                 ofdev = of_find_device_by_node(mdio);
 276
 277                 of_node_put(mdio);
 278
 279                 id = of_get_property(tbi, "reg", NULL);
 280                 if (!id)
 281                         return 0;
 282
 283                 of_node_put(tbi);
 284
 285                 bus = dev_get_drvdata(&ofdev->dev);
 286
 287                 priv->tbiphy = bus->phy_map[*id];
 288         }
 289
 290         return 0;
 291
 292 err_out:
 293         iounmap(priv->regs);
 294         return err;
 295 }
 296
 297 /* Set up the ethernet device structure, private data,
 298  * and anything else we need before we start */
 299 static int gfar_probe(struct of_device *ofdev,
 300                 const struct of_device_id *match)
 301 {
 302         u32 tempval;
 303         struct net_device *dev = NULL;
 304         struct gfar_private *priv = NULL;
 305         int err = 0;
 306         DECLARE_MAC_BUF(mac);
 307
 308         /* Create an ethernet device instance */
 309         dev = alloc_etherdev(sizeof (*priv));
 310
 311         if (NULL == dev)
 312                 return -ENOMEM;
 313
 314         priv = netdev_priv(dev);
 315         priv->dev = dev;
 316         priv->node = ofdev->node;
 317
 318         err = gfar_of_init(dev);
 319
 320         if (err)
 321                 goto regs_fail;
 322
 323         spin_lock_init(&priv->txlock);
 324         spin_lock_init(&priv->rxlock);
 325         spin_lock_init(&priv->bflock);
 326         INIT_WORK(&priv->reset_task, gfar_reset_task);
 327
 328         dev_set_drvdata(&ofdev->dev, priv);
 329
 330         /* Stop the DMA engine now, in case it was running before */
 331         /* (The firmware could have used it, and left it running). */
 332         gfar_halt(dev);
 333
 334         /* Reset MAC layer */
 335         gfar_write(&priv->regs->maccfg1, MACCFG1_SOFT_RESET);
 336
 337         tempval = (MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
 338         gfar_write(&priv->regs->maccfg1, tempval);
 339
 340         /* Initialize MACCFG2. */
 341         gfar_write(&priv->regs->maccfg2, MACCFG2_INIT_SETTINGS);
 342
 343         /* Initialize ECNTRL */
 344         gfar_write(&priv->regs->ecntrl, ECNTRL_INIT_SETTINGS);
 345
 346         /* Set the dev->base_addr to the gfar reg region */
 347         dev->base_addr = (unsigned long) (priv->regs);
 348
 349         SET_NETDEV_DEV(dev, &ofdev->dev);
 350
 351         /* Fill in the dev structure */
 352         dev->open = gfar_enet_open;
 353         dev->hard_start_xmit = gfar_start_xmit;
 354         dev->tx_timeout = gfar_timeout;
 355         dev->watchdog_timeo = TX_TIMEOUT;
 356         netif_napi_add(dev, &priv->napi, gfar_poll, GFAR_DEV_WEIGHT);
 357 #ifdef CONFIG_NET_POLL_CONTROLLER
 358         dev->poll_controller = gfar_netpoll;
 359 #endif
 360         dev->stop = gfar_close;
 361         dev->change_mtu = gfar_change_mtu;
 362         dev->mtu = 1500;
 363         dev->set_multicast_list = gfar_set_multi;
 364
 365         dev->ethtool_ops = &gfar_ethtool_ops;
 366
 367         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_CSUM) {
 368                 priv->rx_csum_enable = 1;
 369                 dev->features |= NETIF_F_IP_CSUM;
 370         } else
 371                 priv->rx_csum_enable = 0;
 372
 373         priv->vlgrp = NULL;
 374
 375         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_VLAN) {
 376                 dev->vlan_rx_register = gfar_vlan_rx_register;
 377
 378                 dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
 379         }
 380
 381         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_EXTENDED_HASH) {
 382                 priv->extended_hash = 1;
 383                 priv->hash_width = 9;
 384
 385                 priv->hash_regs[0] = &priv->regs->igaddr0;
 386                 priv->hash_regs[1] = &priv->regs->igaddr1;
 387                 priv->hash_regs[2] = &priv->regs->igaddr2;
 388                 priv->hash_regs[3] = &priv->regs->igaddr3;
 389                 priv->hash_regs[4] = &priv->regs->igaddr4;
 390                 priv->hash_regs[5] = &priv->regs->igaddr5;
 391                 priv->hash_regs[6] = &priv->regs->igaddr6;
 392                 priv->hash_regs[7] = &priv->regs->igaddr7;
 393                 priv->hash_regs[8] = &priv->regs->gaddr0;
 394                 priv->hash_regs[9] = &priv->regs->gaddr1;
 395                 priv->hash_regs[10] = &priv->regs->gaddr2;
 396                 priv->hash_regs[11] = &priv->regs->gaddr3;
 397                 priv->hash_regs[12] = &priv->regs->gaddr4;
 398                 priv->hash_regs[13] = &priv->regs->gaddr5;
 399                 priv->hash_regs[14] = &priv->regs->gaddr6;
 400                 priv->hash_regs[15] = &priv->regs->gaddr7;
 401
 402         } else {
 403                 priv->extended_hash = 0;
 404                 priv->hash_width = 8;
 405
 406                 priv->hash_regs[0] = &priv->regs->gaddr0;
 407                 priv->hash_regs[1] = &priv->regs->gaddr1;
 408                 priv->hash_regs[2] = &priv->regs->gaddr2;
 409                 priv->hash_regs[3] = &priv->regs->gaddr3;
 410                 priv->hash_regs[4] = &priv->regs->gaddr4;
 411                 priv->hash_regs[5] = &priv->regs->gaddr5;
 412                 priv->hash_regs[6] = &priv->regs->gaddr6;
 413                 priv->hash_regs[7] = &priv->regs->gaddr7;
 414         }
 415
 416         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_PADDING)
 417                 priv->padding = DEFAULT_PADDING;
 418         else
 419                 priv->padding = 0;
 420
 421         if (dev->features & NETIF_F_IP_CSUM)
 422                 dev->hard_header_len += GMAC_FCB_LEN;
 423
 424         priv->rx_buffer_size = DEFAULT_RX_BUFFER_SIZE;
 425         priv->tx_ring_size = DEFAULT_TX_RING_SIZE;
 426         priv->rx_ring_size = DEFAULT_RX_RING_SIZE;
 427
 428         priv->txcoalescing = DEFAULT_TX_COALESCE;
 429         priv->txic = DEFAULT_TXIC;
 430         priv->rxcoalescing = DEFAULT_RX_COALESCE;
 431         priv->rxic = DEFAULT_RXIC;
 432
 433         /* Enable most messages by default */
 434         priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
 435
 436         /* Carrier starts down, phylib will bring it up */
 437         netif_carrier_off(dev);
 438
 439         err = register_netdev(dev);
 440
 441         if (err) {
 442                 printk(KERN_ERR "%s: Cannot register net device, aborting.\n",
 443                                 dev->name);
 444                 goto register_fail;
 445         }
 446
 447         /* Create all the sysfs files */
 448         gfar_init_sysfs(dev);
 449
 450         /* Print out the device info */
 451         printk(KERN_INFO DEVICE_NAME "%pM\n", dev->name, dev->dev_addr);
 452
 453         /* Even more device info helps when determining which kernel */
 454         /* provided which set of benchmarks. */
 455         printk(KERN_INFO "%s: Running with NAPI enabled\n", dev->name);
 456         printk(KERN_INFO "%s: %d/%d RX/TX BD ring size\n",
 457                dev->name, priv->rx_ring_size, priv->tx_ring_size);
 458
 459         return 0;
 460
 461 register_fail:
 462         iounmap(priv->regs);
 463 regs_fail:
 464         free_netdev(dev);
 465         return err;
 466 }
 467
 468 static int gfar_remove(struct of_device *ofdev)
 469 {
 470         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 471
 472         dev_set_drvdata(&ofdev->dev, NULL);
 473
 474         iounmap(priv->regs);
 475         free_netdev(priv->dev);
 476
 477         return 0;
 478 }
 479
 480 #ifdef CONFIG_PM
 481 static int gfar_suspend(struct of_device *ofdev, pm_message_t state)
 482 {
 483         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 484         struct net_device *dev = priv->dev;
 485         unsigned long flags;
 486         u32 tempval;
 487
 488         int magic_packet = priv->wol_en &&
 489                 (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
 490
 491         netif_device_detach(dev);
 492
 493         if (netif_running(dev)) {
 494                 spin_lock_irqsave(&priv->txlock, flags);
 495                 spin_lock(&priv->rxlock);
 496
 497                 gfar_halt_nodisable(dev);
 498
 499                 /* Disable Tx, and Rx if wake-on-LAN is disabled. */
 500                 tempval = gfar_read(&priv->regs->maccfg1);
 501
 502                 tempval &= ~MACCFG1_TX_EN;
 503
 504                 if (!magic_packet)
 505                         tempval &= ~MACCFG1_RX_EN;
 506
 507                 gfar_write(&priv->regs->maccfg1, tempval);
 508
 509                 spin_unlock(&priv->rxlock);
 510                 spin_unlock_irqrestore(&priv->txlock, flags);
 511
 512                 napi_disable(&priv->napi);
 513
 514                 if (magic_packet) {
 515                         /* Enable interrupt on Magic Packet */
 516                         gfar_write(&priv->regs->imask, IMASK_MAG);
 517
 518                         /* Enable Magic Packet mode */
 519                         tempval = gfar_read(&priv->regs->maccfg2);
 520                         tempval |= MACCFG2_MPEN;
 521                         gfar_write(&priv->regs->maccfg2, tempval);
 522                 } else {
 523                         phy_stop(priv->phydev);
 524                 }
 525         }
 526
 527         return 0;
 528 }
 529
 530 static int gfar_resume(struct of_device *ofdev)
 531 {
 532         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 533         struct net_device *dev = priv->dev;
 534         unsigned long flags;
 535         u32 tempval;
 536         int magic_packet = priv->wol_en &&
 537                 (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
 538
 539         if (!netif_running(dev)) {
 540                 netif_device_attach(dev);
 541                 return 0;
 542         }
 543
 544         if (!magic_packet && priv->phydev)
 545                 phy_start(priv->phydev);
 546
 547         /* Disable Magic Packet mode, in case something
 548          * else woke us up.
 549          */
 550
 551         spin_lock_irqsave(&priv->txlock, flags);
 552         spin_lock(&priv->rxlock);
 553
 554         tempval = gfar_read(&priv->regs->maccfg2);
 555         tempval &= ~MACCFG2_MPEN;
 556         gfar_write(&priv->regs->maccfg2, tempval);
 557
 558         gfar_start(dev);
 559
 560         spin_unlock(&priv->rxlock);
 561         spin_unlock_irqrestore(&priv->txlock, flags);
 562
 563         netif_device_attach(dev);
 564
 565         napi_enable(&priv->napi);
 566
 567         return 0;
 568 }
 569 #else
 570 #define gfar_suspend NULL
 571 #define gfar_resume NULL
 572 #endif
 573
 574 /* Reads the controller's registers to determine what interface
 575  * connects it to the PHY.
 576  */
 577 static phy_interface_t gfar_get_interface(struct net_device *dev)
 578 {
 579         struct gfar_private *priv = netdev_priv(dev);
 580         u32 ecntrl = gfar_read(&priv->regs->ecntrl);
 581
 582         if (ecntrl & ECNTRL_SGMII_MODE)
 583                 return PHY_INTERFACE_MODE_SGMII;
 584
 585         if (ecntrl & ECNTRL_TBI_MODE) {
 586                 if (ecntrl & ECNTRL_REDUCED_MODE)
 587                         return PHY_INTERFACE_MODE_RTBI;
 588                 else
 589                         return PHY_INTERFACE_MODE_TBI;
 590         }
 591
 592         if (ecntrl & ECNTRL_REDUCED_MODE) {
 593                 if (ecntrl & ECNTRL_REDUCED_MII_MODE)
 594                         return PHY_INTERFACE_MODE_RMII;
 595                 else {
 596                         phy_interface_t interface = priv->interface;
 597
 598                         /*
 599                          * This isn't autodetected right now, so it must
 600                          * be set by the device tree or platform code.
 601                          */
 602                         if (interface == PHY_INTERFACE_MODE_RGMII_ID)
 603                                 return PHY_INTERFACE_MODE_RGMII_ID;
 604
 605                         return PHY_INTERFACE_MODE_RGMII;
 606                 }
 607         }
 608
 609         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT)
 610                 return PHY_INTERFACE_MODE_GMII;
 611
 612         return PHY_INTERFACE_MODE_MII;
 613 }
 614
 615
 616 /* Initializes driver's PHY state, and attaches to the PHY.
 617  * Returns 0 on success.
 618  */
 619 static int init_phy(struct net_device *dev)
 620 {
 621         struct gfar_private *priv = netdev_priv(dev);
 622         uint gigabit_support =
 623                 priv->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT ?
 624                 SUPPORTED_1000baseT_Full : 0;
 625         struct phy_device *phydev;
 626         phy_interface_t interface;
 627
 628         priv->oldlink = 0;
 629         priv->oldspeed = 0;
 630         priv->oldduplex = -1;
 631
 632         interface = gfar_get_interface(dev);
 633
 634         phydev = phy_connect(dev, priv->phy_bus_id, &adjust_link, 0, interface);
 635
 636         if (interface == PHY_INTERFACE_MODE_SGMII)
 637                 gfar_configure_serdes(dev);
 638
 639         if (IS_ERR(phydev)) {
 640                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 641                 return PTR_ERR(phydev);
 642         }
 643
 644         /* Remove any features not supported by the controller */
 645         phydev->supported &= (GFAR_SUPPORTED | gigabit_support);
 646         phydev->advertising = phydev->supported;
 647
 648         priv->phydev = phydev;
 649
 650         return 0;
 651 }
 652
 653 /*
 654  * Initialize TBI PHY interface for communicating with the
 655  * SERDES lynx PHY on the chip.  We communicate with this PHY
 656  * through the MDIO bus on each controller, treating it as a
 657  * "normal" PHY at the address found in the TBIPA register.  We assume
 658  * that the TBIPA register is valid.  Either the MDIO bus code will set
 659  * it to a value that doesn't conflict with other PHYs on the bus, or the
 660  * value doesn't matter, as there are no other PHYs on the bus.
 661  */
 662 static void gfar_configure_serdes(struct net_device *dev)
 663 {
 664         struct gfar_private *priv = netdev_priv(dev);
 665
 666         if (!priv->tbiphy) {
 667                 printk(KERN_WARNING "SGMII mode requires that the device "
 668                                 "tree specify a tbi-handle\n");
 669                 return;
 670         }
 671
 672         /*
 673          * If the link is already up, we must already be ok, and don't need to
 674          * configure and reset the TBI<->SerDes link.  Maybe U-Boot configured
 675          * everything for us?  Resetting it takes the link down and requires
 676          * several seconds for it to come back.
 677          */
 678         if (phy_read(priv->tbiphy, MII_BMSR) & BMSR_LSTATUS)
 679                 return;
 680
 681         /* Single clk mode, mii mode off(for serdes communication) */
 682         phy_write(priv->tbiphy, MII_TBICON, TBICON_CLK_SELECT);
 683
 684         phy_write(priv->tbiphy, MII_ADVERTISE,
 685                         ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
 686                         ADVERTISE_1000XPSE_ASYM);
 687
 688         phy_write(priv->tbiphy, MII_BMCR, BMCR_ANENABLE |
 689                         BMCR_ANRESTART | BMCR_FULLDPLX | BMCR_SPEED1000);
 690 }
 691
 692 static void init_registers(struct net_device *dev)
 693 {
 694         struct gfar_private *priv = netdev_priv(dev);
 695
 696         /* Clear IEVENT */
 697         gfar_write(&priv->regs->ievent, IEVENT_INIT_CLEAR);
 698
 699         /* Initialize IMASK */
 700         gfar_write(&priv->regs->imask, IMASK_INIT_CLEAR);
 701
 702         /* Init hash registers to zero */
 703         gfar_write(&priv->regs->igaddr0, 0);
 704         gfar_write(&priv->regs->igaddr1, 0);
 705         gfar_write(&priv->regs->igaddr2, 0);
 706         gfar_write(&priv->regs->igaddr3, 0);
 707         gfar_write(&priv->regs->igaddr4, 0);
 708         gfar_write(&priv->regs->igaddr5, 0);
 709         gfar_write(&priv->regs->igaddr6, 0);
 710         gfar_write(&priv->regs->igaddr7, 0);
 711
 712         gfar_write(&priv->regs->gaddr0, 0);
 713         gfar_write(&priv->regs->gaddr1, 0);
 714         gfar_write(&priv->regs->gaddr2, 0);
 715         gfar_write(&priv->regs->gaddr3, 0);
 716         gfar_write(&priv->regs->gaddr4, 0);
 717         gfar_write(&priv->regs->gaddr5, 0);
 718         gfar_write(&priv->regs->gaddr6, 0);
 719         gfar_write(&priv->regs->gaddr7, 0);
 720
 721         /* Zero out the rmon mib registers if it has them */
 722         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
 723                 memset_io(&(priv->regs->rmon), 0, sizeof (struct rmon_mib));
 724
 725                 /* Mask off the CAM interrupts */
 726                 gfar_write(&priv->regs->rmon.cam1, 0xffffffff);
 727                 gfar_write(&priv->regs->rmon.cam2, 0xffffffff);
 728         }
 729
 730         /* Initialize the max receive buffer length */
 731         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
 732
 733         /* Initialize the Minimum Frame Length Register */
 734         gfar_write(&priv->regs->minflr, MINFLR_INIT_SETTINGS);
 735 }
 736
 737
 738 /* Halt the receive and transmit queues */
 739 static void gfar_halt_nodisable(struct net_device *dev)
 740 {
 741         struct gfar_private *priv = netdev_priv(dev);
 742         struct gfar __iomem *regs = priv->regs;
 743         u32 tempval;
 744
 745         /* Mask all interrupts */
 746         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 747
 748         /* Clear all interrupts */
 749         gfar_write(&regs->ievent, IEVENT_INIT_CLEAR);
 750
 751         /* Stop the DMA, and wait for it to stop */
 752         tempval = gfar_read(&priv->regs->dmactrl);
 753         if ((tempval & (DMACTRL_GRS | DMACTRL_GTS))
 754             != (DMACTRL_GRS | DMACTRL_GTS)) {
 755                 tempval |= (DMACTRL_GRS | DMACTRL_GTS);
 756                 gfar_write(&priv->regs->dmactrl, tempval);
 757
 758                 while (!(gfar_read(&priv->regs->ievent) &
 759                          (IEVENT_GRSC | IEVENT_GTSC)))
 760                         cpu_relax();
 761         }
 762 }
 763
 764 /* Halt the receive and transmit queues */
 765 void gfar_halt(struct net_device *dev)
 766 {
 767         struct gfar_private *priv = netdev_priv(dev);
 768         struct gfar __iomem *regs = priv->regs;
 769         u32 tempval;
 770
 771         gfar_halt_nodisable(dev);
 772
 773         /* Disable Rx and Tx */
 774         tempval = gfar_read(&regs->maccfg1);
 775         tempval &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
 776         gfar_write(&regs->maccfg1, tempval);
 777 }
 778
 779 void stop_gfar(struct net_device *dev)
 780 {
 781         struct gfar_private *priv = netdev_priv(dev);
 782         struct gfar __iomem *regs = priv->regs;
 783         unsigned long flags;
 784
 785         phy_stop(priv->phydev);
 786
 787         /* Lock it down */
 788         spin_lock_irqsave(&priv->txlock, flags);
 789         spin_lock(&priv->rxlock);
 790
 791         gfar_halt(dev);
 792
 793         spin_unlock(&priv->rxlock);
 794         spin_unlock_irqrestore(&priv->txlock, flags);
 795
 796         /* Free the IRQs */
 797         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 798                 free_irq(priv->interruptError, dev);
 799                 free_irq(priv->interruptTransmit, dev);
 800                 free_irq(priv->interruptReceive, dev);
 801         } else {
 802                 free_irq(priv->interruptTransmit, dev);
 803         }
 804
 805         free_skb_resources(priv);
 806
 807         dma_free_coherent(&dev->dev,
 808                         sizeof(struct txbd8)*priv->tx_ring_size
 809                         + sizeof(struct rxbd8)*priv->rx_ring_size,
 810                         priv->tx_bd_base,
 811                         gfar_read(&regs->tbase0));
 812 }
 813
 814 /* If there are any tx skbs or rx skbs still around, free them.
 815  * Then free tx_skbuff and rx_skbuff */
 816 static void free_skb_resources(struct gfar_private *priv)
 817 {
 818         struct rxbd8 *rxbdp;
 819         struct txbd8 *txbdp;
 820         int i;
 821
 822         /* Go through all the buffer descriptors and free their data buffers */
 823         txbdp = priv->tx_bd_base;
 824
 825         for (i = 0; i < priv->tx_ring_size; i++) {
 826
 827                 if (priv->tx_skbuff[i]) {
 828                         dma_unmap_single(&priv->dev->dev, txbdp->bufPtr,
 829                                         txbdp->length,
 830                                         DMA_TO_DEVICE);
 831                         dev_kfree_skb_any(priv->tx_skbuff[i]);
 832                         priv->tx_skbuff[i] = NULL;
 833                 }
 834
 835                 txbdp++;
 836         }
 837
 838         kfree(priv->tx_skbuff);
 839
 840         rxbdp = priv->rx_bd_base;
 841
 842         /* rx_skbuff is not guaranteed to be allocated, so only
 843          * free it and its contents if it is allocated */
 844         if(priv->rx_skbuff != NULL) {
 845                 for (i = 0; i < priv->rx_ring_size; i++) {
 846                         if (priv->rx_skbuff[i]) {
 847                                 dma_unmap_single(&priv->dev->dev, rxbdp->bufPtr,
 848                                                 priv->rx_buffer_size,
 849                                                 DMA_FROM_DEVICE);
 850
 851                                 dev_kfree_skb_any(priv->rx_skbuff[i]);
 852                                 priv->rx_skbuff[i] = NULL;
 853                         }
 854
 855                         rxbdp->status = 0;
 856                         rxbdp->length = 0;
 857                         rxbdp->bufPtr = 0;
 858
 859                         rxbdp++;
 860                 }
 861
 862                 kfree(priv->rx_skbuff);
 863         }
 864 }
 865
 866 void gfar_start(struct net_device *dev)
 867 {
 868         struct gfar_private *priv = netdev_priv(dev);
 869         struct gfar __iomem *regs = priv->regs;
 870         u32 tempval;
 871
 872         /* Enable Rx and Tx in MACCFG1 */
 873         tempval = gfar_read(&regs->maccfg1);
 874         tempval |= (MACCFG1_RX_EN | MACCFG1_TX_EN);
 875         gfar_write(&regs->maccfg1, tempval);
 876
 877         /* Initialize DMACTRL to have WWR and WOP */
 878         tempval = gfar_read(&priv->regs->dmactrl);
 879         tempval |= DMACTRL_INIT_SETTINGS;
 880         gfar_write(&priv->regs->dmactrl, tempval);
 881
 882         /* Make sure we aren't stopped */
 883         tempval = gfar_read(&priv->regs->dmactrl);
 884         tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
 885         gfar_write(&priv->regs->dmactrl, tempval);
 886
 887         /* Clear THLT/RHLT, so that the DMA starts polling now */
 888         gfar_write(&regs->tstat, TSTAT_CLEAR_THALT);
 889         gfar_write(&regs->rstat, RSTAT_CLEAR_RHALT);
 890
 891         /* Unmask the interrupts we look for */
 892         gfar_write(&regs->imask, IMASK_DEFAULT);
 893
 894         dev->trans_start = jiffies;
 895 }
 896
 897 /* Bring the controller up and running */
 898 int startup_gfar(struct net_device *dev)
 899 {
 900         struct txbd8 *txbdp;
 901         struct rxbd8 *rxbdp;
 902         dma_addr_t addr = 0;
 903         unsigned long vaddr;
 904         int i;
 905         struct gfar_private *priv = netdev_priv(dev);
 906         struct gfar __iomem *regs = priv->regs;
 907         int err = 0;
 908         u32 rctrl = 0;
 909         u32 attrs = 0;
 910
 911         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 912
 913         /* Allocate memory for the buffer descriptors */
 914         vaddr = (unsigned long) dma_alloc_coherent(&dev->dev,
 915                         sizeof (struct txbd8) * priv->tx_ring_size +
 916                         sizeof (struct rxbd8) * priv->rx_ring_size,
 917                         &addr, GFP_KERNEL);
 918
 919         if (vaddr == 0) {
 920                 if (netif_msg_ifup(priv))
 921                         printk(KERN_ERR "%s: Could not allocate buffer descriptors!\n",
 922                                         dev->name);
 923                 return -ENOMEM;
 924         }
 925
 926         priv->tx_bd_base = (struct txbd8 *) vaddr;
 927
 928         /* enet DMA only understands physical addresses */
 929         gfar_write(&regs->tbase0, addr);
 930
 931         /* Start the rx descriptor ring where the tx ring leaves off */
 932         addr = addr + sizeof (struct txbd8) * priv->tx_ring_size;
 933         vaddr = vaddr + sizeof (struct txbd8) * priv->tx_ring_size;
 934         priv->rx_bd_base = (struct rxbd8 *) vaddr;
 935         gfar_write(&regs->rbase0, addr);
 936
 937         /* Setup the skbuff rings */
 938         priv->tx_skbuff =
 939             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 940                                         priv->tx_ring_size, GFP_KERNEL);
 941
 942         if (NULL == priv->tx_skbuff) {
 943                 if (netif_msg_ifup(priv))
 944                         printk(KERN_ERR "%s: Could not allocate tx_skbuff\n",
 945                                         dev->name);
 946                 err = -ENOMEM;
 947                 goto tx_skb_fail;
 948         }
 949
 950         for (i = 0; i < priv->tx_ring_size; i++)
 951                 priv->tx_skbuff[i] = NULL;
 952
 953         priv->rx_skbuff =
 954             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 955                                         priv->rx_ring_size, GFP_KERNEL);
 956
 957         if (NULL == priv->rx_skbuff) {
 958                 if (netif_msg_ifup(priv))
 959                         printk(KERN_ERR "%s: Could not allocate rx_skbuff\n",
 960                                         dev->name);
 961                 err = -ENOMEM;
 962                 goto rx_skb_fail;
 963         }
 964
 965         for (i = 0; i < priv->rx_ring_size; i++)
 966                 priv->rx_skbuff[i] = NULL;
 967
 968         /* Initialize some variables in our dev structure */
 969         priv->dirty_tx = priv->cur_tx = priv->tx_bd_base;
 970         priv->cur_rx = priv->rx_bd_base;
 971         priv->skb_curtx = priv->skb_dirtytx = 0;
 972         priv->skb_currx = 0;
 973
 974         /* Initialize Transmit Descriptor Ring */
 975         txbdp = priv->tx_bd_base;
 976         for (i = 0; i < priv->tx_ring_size; i++) {
 977                 txbdp->status = 0;
 978                 txbdp->length = 0;
 979                 txbdp->bufPtr = 0;
 980                 txbdp++;
 981         }
 982
 983         /* Set the last descriptor in the ring to indicate wrap */
 984         txbdp--;
 985         txbdp->status |= TXBD_WRAP;
 986
 987         rxbdp = priv->rx_bd_base;
 988         for (i = 0; i < priv->rx_ring_size; i++) {
 989                 struct sk_buff *skb;
 990
 991                 skb = gfar_new_skb(dev);
 992
 993                 if (!skb) {
 994                         printk(KERN_ERR "%s: Can't allocate RX buffers\n",
 995                                         dev->name);
 996
 997                         goto err_rxalloc_fail;
 998                 }
 999
1000                 priv->rx_skbuff[i] = skb;
1001
1002                 gfar_new_rxbdp(dev, rxbdp, skb);
1003
1004                 rxbdp++;
1005         }
1006
1007         /* Set the last descriptor in the ring to wrap */
1008         rxbdp--;
1009         rxbdp->status |= RXBD_WRAP;
1010
1011         /* If the device has multiple interrupts, register for
1012          * them.  Otherwise, only register for the one */
1013         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
1014                 /* Install our interrupt handlers for Error,
1015                  * Transmit, and Receive */
1016                 if (request_irq(priv->interruptError, gfar_error,
1017                                 0, "enet_error", dev) < 0) {
1018                         if (netif_msg_intr(priv))
1019                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1020                                         dev->name, priv->interruptError);
1021
1022                         err = -1;
1023                         goto err_irq_fail;
1024                 }
1025
1026                 if (request_irq(priv->interruptTransmit, gfar_transmit,
1027                                 0, "enet_tx", dev) < 0) {
1028                         if (netif_msg_intr(priv))
1029                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1030                                         dev->name, priv->interruptTransmit);
1031
1032                         err = -1;
1033
1034                         goto tx_irq_fail;
1035                 }
1036
1037                 if (request_irq(priv->interruptReceive, gfar_receive,
1038                                 0, "enet_rx", dev) < 0) {
1039                         if (netif_msg_intr(priv))
1040                                 printk(KERN_ERR "%s: Can't get IRQ %d (receive0)\n",
1041                                                 dev->name, priv->interruptReceive);
1042
1043                         err = -1;
1044                         goto rx_irq_fail;
1045                 }
1046         } else {
1047                 if (request_irq(priv->interruptTransmit, gfar_interrupt,
1048                                 0, "gfar_interrupt", dev) < 0) {
1049                         if (netif_msg_intr(priv))
1050                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1051                                         dev->name, priv->interruptError);
1052
1053                         err = -1;
1054                         goto err_irq_fail;
1055                 }
1056         }
1057
1058         phy_start(priv->phydev);
1059
1060         /* Configure the coalescing support */
1061         gfar_write(&regs->txic, 0);
1062         if (priv->txcoalescing)
1063                 gfar_write(&regs->txic, priv->txic);
1064
1065         gfar_write(&regs->rxic, 0);
1066         if (priv->rxcoalescing)
1067                 gfar_write(&regs->rxic, priv->rxic);
1068
1069         if (priv->rx_csum_enable)
1070                 rctrl |= RCTRL_CHECKSUMMING;
1071
1072         if (priv->extended_hash) {
1073                 rctrl |= RCTRL_EXTHASH;
1074
1075                 gfar_clear_exact_match(dev);
1076                 rctrl |= RCTRL_EMEN;
1077         }
1078
1079         if (priv->padding) {
1080                 rctrl &= ~RCTRL_PAL_MASK;
1081                 rctrl |= RCTRL_PADDING(priv->padding);
1082         }
1083
1084         /* Init rctrl based on our settings */
1085         gfar_write(&priv->regs->rctrl, rctrl);
1086
1087         if (dev->features & NETIF_F_IP_CSUM)
1088                 gfar_write(&priv->regs->tctrl, TCTRL_INIT_CSUM);
1089
1090         /* Set the extraction length and index */
1091         attrs = ATTRELI_EL(priv->rx_stash_size) |
1092                 ATTRELI_EI(priv->rx_stash_index);
1093
1094         gfar_write(&priv->regs->attreli, attrs);
1095
1096         /* Start with defaults, and add stashing or locking
1097          * depending on the approprate variables */
1098         attrs = ATTR_INIT_SETTINGS;
1099
1100         if (priv->bd_stash_en)
1101                 attrs |= ATTR_BDSTASH;
1102
1103         if (priv->rx_stash_size != 0)
1104                 attrs |= ATTR_BUFSTASH;
1105
1106         gfar_write(&priv->regs->attr, attrs);
1107
1108         gfar_write(&priv->regs->fifo_tx_thr, priv->fifo_threshold);
1109         gfar_write(&priv->regs->fifo_tx_starve, priv->fifo_starve);
1110         gfar_write(&priv->regs->fifo_tx_starve_shutoff, priv->fifo_starve_off);
1111
1112         /* Start the controller */
1113         gfar_start(dev);
1114
1115         return 0;
1116
1117 rx_irq_fail:
1118         free_irq(priv->interruptTransmit, dev);
1119 tx_irq_fail:
1120         free_irq(priv->interruptError, dev);
1121 err_irq_fail:
1122 err_rxalloc_fail:
1123 rx_skb_fail:
1124         free_skb_resources(priv);
1125 tx_skb_fail:
1126         dma_free_coherent(&dev->dev,
1127                         sizeof(struct txbd8)*priv->tx_ring_size
1128                         + sizeof(struct rxbd8)*priv->rx_ring_size,
1129                         priv->tx_bd_base,
1130                         gfar_read(&regs->tbase0));
1131
1132         return err;
1133 }
1134
1135 /* Called when something needs to use the ethernet device */
1136 /* Returns 0 for success. */
1137 static int gfar_enet_open(struct net_device *dev)
1138 {
1139         struct gfar_private *priv = netdev_priv(dev);
1140         int err;
1141
1142         napi_enable(&priv->napi);
1143
1144         /* Initialize a bunch of registers */
1145         init_registers(dev);
1146
1147         gfar_set_mac_address(dev);
1148
1149         err = init_phy(dev);
1150
1151         if(err) {
1152                 napi_disable(&priv->napi);
1153                 return err;
1154         }
1155
1156         err = startup_gfar(dev);
1157         if (err) {
1158                 napi_disable(&priv->napi);
1159                 return err;
1160         }
1161
1162         netif_start_queue(dev);
1163
1164         return err;
1165 }
1166
1167 static inline struct txfcb *gfar_add_fcb(struct sk_buff *skb, struct txbd8 *bdp)
1168 {
1169         struct txfcb *fcb = (struct txfcb *)skb_push (skb, GMAC_FCB_LEN);
1170
1171         memset(fcb, 0, GMAC_FCB_LEN);
1172
1173         return fcb;
1174 }
1175
1176 static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
1177 {
1178         u8 flags = 0;
1179
1180         /* If we're here, it's a IP packet with a TCP or UDP
1181          * payload.  We set it to checksum, using a pseudo-header
1182          * we provide
1183          */
1184         flags = TXFCB_DEFAULT;
1185
1186         /* Tell the controller what the protocol is */
1187         /* And provide the already calculated phcs */
1188         if (ip_hdr(skb)->protocol == IPPROTO_UDP) {
1189                 flags |= TXFCB_UDP;
1190                 fcb->phcs = udp_hdr(skb)->check;
1191         } else
1192                 fcb->phcs = tcp_hdr(skb)->check;
1193
1194         /* l3os is the distance between the start of the
1195          * frame (skb->data) and the start of the IP hdr.
1196          * l4os is the distance between the start of the
1197          * l3 hdr and the l4 hdr */
1198         fcb->l3os = (u16)(skb_network_offset(skb) - GMAC_FCB_LEN);
1199         fcb->l4os = skb_network_header_len(skb);
1200
1201         fcb->flags = flags;
1202 }
1203
1204 void inline gfar_tx_vlan(struct sk_buff *skb, struct txfcb *fcb)
1205 {
1206         fcb->flags |= TXFCB_VLN;
1207         fcb->vlctl = vlan_tx_tag_get(skb);
1208 }
1209
1210 /* This is called by the kernel when a frame is ready for transmission. */
1211 /* It is pointed to by the dev->hard_start_xmit function pointer */
1212 static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
1213 {
1214         struct gfar_private *priv = netdev_priv(dev);
1215         struct txfcb *fcb = NULL;
1216         struct txbd8 *txbdp;
1217         u16 status;
1218         unsigned long flags;
1219
1220         /* Update transmit stats */
1221         dev->stats.tx_bytes += skb->len;
1222
1223         /* Lock priv now */
1224         spin_lock_irqsave(&priv->txlock, flags);
1225
1226         /* Point at the first free tx descriptor */
1227         txbdp = priv->cur_tx;
1228
1229         /* Clear all but the WRAP status flags */
1230         status = txbdp->status & TXBD_WRAP;
1231
1232         /* Set up checksumming */
1233         if (CHECKSUM_PARTIAL == skb->ip_summed) {
1234                 fcb = gfar_add_fcb(skb, txbdp);
1235                 status |= TXBD_TOE;
1236                 gfar_tx_checksum(skb, fcb);
1237         }
1238
1239         if (priv->vlgrp && vlan_tx_tag_present(skb)) {
1240                 if (unlikely(NULL == fcb)) {
1241                         fcb = gfar_add_fcb(skb, txbdp);
1242                         status |= TXBD_TOE;
1243                 }
1244
1245                 gfar_tx_vlan(skb, fcb);
1246         }
1247
1248         /* Set buffer length and pointer */
1249         txbdp->length = skb->len;
1250         txbdp->bufPtr = dma_map_single(&dev->dev, skb->data,
1251                         skb->len, DMA_TO_DEVICE);
1252
1253         /* Save the skb pointer so we can free it later */
1254         priv->tx_skbuff[priv->skb_curtx] = skb;
1255
1256         /* Update the current skb pointer (wrapping if this was the last) */
1257         priv->skb_curtx =
1258             (priv->skb_curtx + 1) & TX_RING_MOD_MASK(priv->tx_ring_size);
1259
1260         /* Flag the BD as interrupt-causing */
1261         status |= TXBD_INTERRUPT;
1262
1263         /* Flag the BD as ready to go, last in frame, and  */
1264         /* in need of CRC */
1265         status |= (TXBD_READY | TXBD_LAST | TXBD_CRC);
1266
1267         dev->trans_start = jiffies;
1268
1269         /* The powerpc-specific eieio() is used, as wmb() has too strong
1270          * semantics (it requires synchronization between cacheable and
1271          * uncacheable mappings, which eieio doesn't provide and which we
1272          * don't need), thus requiring a more expensive sync instruction.  At
1273          * some point, the set of architecture-independent barrier functions
1274          * should be expanded to include weaker barriers.
1275          */
1276
1277         eieio();
1278         txbdp->status = status;
1279
1280         /* If this was the last BD in the ring, the next one */
1281         /* is at the beginning of the ring */
1282         if (txbdp->status & TXBD_WRAP)
1283                 txbdp = priv->tx_bd_base;
1284         else
1285                 txbdp++;
1286
1287         /* If the next BD still needs to be cleaned up, then the bds
1288            are full.  We need to tell the kernel to stop sending us stuff. */
1289         if (txbdp == priv->dirty_tx) {
1290                 netif_stop_queue(dev);
1291
1292                 dev->stats.tx_fifo_errors++;
1293         }
1294
1295         /* Update the current txbd to the next one */
1296         priv->cur_tx = txbdp;
1297
1298         /* Tell the DMA to go go go */
1299         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
1300
1301         /* Unlock priv */
1302         spin_unlock_irqrestore(&priv->txlock, flags);
1303
1304         return 0;
1305 }
1306
1307 /* Stops the kernel queue, and halts the controller */
1308 static int gfar_close(struct net_device *dev)
1309 {
1310         struct gfar_private *priv = netdev_priv(dev);
1311
1312         napi_disable(&priv->napi);
1313
1314         cancel_work_sync(&priv->reset_task);
1315         stop_gfar(dev);
1316
1317         /* Disconnect from the PHY */
1318         phy_disconnect(priv->phydev);
1319         priv->phydev = NULL;
1320
1321         netif_stop_queue(dev);
1322
1323         return 0;
1324 }
1325
1326 /* Changes the mac address if the controller is not running. */
1327 static int gfar_set_mac_address(struct net_device *dev)
1328 {
1329         gfar_set_mac_for_addr(dev, 0, dev->dev_addr);
1330
1331         return 0;
1332 }
1333
1334
1335 /* Enables and disables VLAN insertion/extraction */
1336 static void gfar_vlan_rx_register(struct net_device *dev,
1337                 struct vlan_group *grp)
1338 {
1339         struct gfar_private *priv = netdev_priv(dev);
1340         unsigned long flags;
1341         struct vlan_group *old_grp;
1342         u32 tempval;
1343
1344         spin_lock_irqsave(&priv->rxlock, flags);
1345
1346         old_grp = priv->vlgrp;
1347
1348         if (old_grp == grp)
1349                 return;
1350
1351         if (grp) {
1352                 /* Enable VLAN tag insertion */
1353                 tempval = gfar_read(&priv->regs->tctrl);
1354                 tempval |= TCTRL_VLINS;
1355
1356                 gfar_write(&priv->regs->tctrl, tempval);
1357
1358                 /* Enable VLAN tag extraction */
1359                 tempval = gfar_read(&priv->regs->rctrl);
1360                 tempval |= RCTRL_VLEX;
1361                 tempval |= (RCTRL_VLEX | RCTRL_PRSDEP_INIT);
1362                 gfar_write(&priv->regs->rctrl, tempval);
1363         } else {
1364                 /* Disable VLAN tag insertion */
1365                 tempval = gfar_read(&priv->regs->tctrl);
1366                 tempval &= ~TCTRL_VLINS;
1367                 gfar_write(&priv->regs->tctrl, tempval);
1368
1369                 /* Disable VLAN tag extraction */
1370                 tempval = gfar_read(&priv->regs->rctrl);
1371                 tempval &= ~RCTRL_VLEX;
1372                 /* If parse is no longer required, then disable parser */
1373                 if (tempval & RCTRL_REQ_PARSER)
1374                         tempval |= RCTRL_PRSDEP_INIT;
1375                 else
1376                         tempval &= ~RCTRL_PRSDEP_INIT;
1377                 gfar_write(&priv->regs->rctrl, tempval);
1378         }
1379
1380         gfar_change_mtu(dev, dev->mtu);
1381
1382         spin_unlock_irqrestore(&priv->rxlock, flags);
1383 }
1384
1385 static int gfar_change_mtu(struct net_device *dev, int new_mtu)
1386 {
1387         int tempsize, tempval;
1388         struct gfar_private *priv = netdev_priv(dev);
1389         int oldsize = priv->rx_buffer_size;
1390         int frame_size = new_mtu + ETH_HLEN;
1391
1392         if (priv->vlgrp)
1393                 frame_size += VLAN_HLEN;
1394
1395         if ((frame_size < 64) || (frame_size > JUMBO_FRAME_SIZE)) {
1396                 if (netif_msg_drv(priv))
1397                         printk(KERN_ERR "%s: Invalid MTU setting\n",
1398                                         dev->name);
1399                 return -EINVAL;
1400         }
1401
1402         if (gfar_uses_fcb(priv))
1403                 frame_size += GMAC_FCB_LEN;
1404
1405         frame_size += priv->padding;
1406
1407         tempsize =
1408             (frame_size & ~(INCREMENTAL_BUFFER_SIZE - 1)) +
1409             INCREMENTAL_BUFFER_SIZE;
1410
1411         /* Only stop and start the controller if it isn't already
1412          * stopped, and we changed something */
1413         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1414                 stop_gfar(dev);
1415
1416         priv->rx_buffer_size = tempsize;
1417
1418         dev->mtu = new_mtu;
1419
1420         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
1421         gfar_write(&priv->regs->maxfrm, priv->rx_buffer_size);
1422
1423         /* If the mtu is larger than the max size for standard
1424          * ethernet frames (ie, a jumbo frame), then set maccfg2
1425          * to allow huge frames, and to check the length */
1426         tempval = gfar_read(&priv->regs->maccfg2);
1427
1428         if (priv->rx_buffer_size > DEFAULT_RX_BUFFER_SIZE)
1429                 tempval |= (MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1430         else
1431                 tempval &= ~(MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1432
1433         gfar_write(&priv->regs->maccfg2, tempval);
1434
1435         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1436                 startup_gfar(dev);
1437
1438         return 0;
1439 }
1440
1441 /* gfar_reset_task gets scheduled when a packet has not been
1442  * transmitted after a set amount of time.
1443  * For now, assume that clearing out all the structures, and
1444  * starting over will fix the problem.
1445  */
1446 static void gfar_reset_task(struct work_struct *work)
1447 {
1448         struct gfar_private *priv = container_of(work, struct gfar_private,
1449                         reset_task);
1450         struct net_device *dev = priv->dev;
1451
1452         if (dev->flags & IFF_UP) {
1453                 stop_gfar(dev);
1454                 startup_gfar(dev);
1455         }
1456
1457         netif_tx_schedule_all(dev);
1458 }
1459
1460 static void gfar_timeout(struct net_device *dev)
1461 {
1462         struct gfar_private *priv = netdev_priv(dev);
1463
1464         dev->stats.tx_errors++;
1465         schedule_work(&priv->reset_task);
1466 }
1467
1468 /* Interrupt Handler for Transmit complete */
1469 static int gfar_clean_tx_ring(struct net_device *dev)
1470 {
1471         struct txbd8 *bdp;
1472         struct gfar_private *priv = netdev_priv(dev);
1473         int howmany = 0;
1474
1475         bdp = priv->dirty_tx;
1476         while ((bdp->status & TXBD_READY) == 0) {
1477                 /* If dirty_tx and cur_tx are the same, then either the */
1478                 /* ring is empty or full now (it could only be full in the beginning, */
1479                 /* obviously).  If it is empty, we are done. */
1480                 if ((bdp == priv->cur_tx) && (netif_queue_stopped(dev) == 0))
1481                         break;
1482
1483                 howmany++;
1484
1485                 /* Deferred means some collisions occurred during transmit, */
1486                 /* but we eventually sent the packet. */
1487                 if (bdp->status & TXBD_DEF)
1488                         dev->stats.collisions++;
1489
1490                 /* Unmap the DMA memory */
1491                 dma_unmap_single(&priv->dev->dev, bdp->bufPtr,
1492                                 bdp->length, DMA_TO_DEVICE);
1493
1494                 /* Free the sk buffer associated with this TxBD */
1495                 dev_kfree_skb_irq(priv->tx_skbuff[priv->skb_dirtytx]);
1496
1497                 priv->tx_skbuff[priv->skb_dirtytx] = NULL;
1498                 priv->skb_dirtytx =
1499                     (priv->skb_dirtytx +
1500                      1) & TX_RING_MOD_MASK(priv->tx_ring_size);
1501
1502                 /* Clean BD length for empty detection */
1503                 bdp->length = 0;
1504
1505                 /* update bdp to point at next bd in the ring (wrapping if necessary) */
1506                 if (bdp->status & TXBD_WRAP)
1507                         bdp = priv->tx_bd_base;
1508                 else
1509                         bdp++;
1510
1511                 /* Move dirty_tx to be the next bd */
1512                 priv->dirty_tx = bdp;
1513
1514                 /* We freed a buffer, so now we can restart transmission */
1515                 if (netif_queue_stopped(dev))
1516                         netif_wake_queue(dev);
1517         } /* while ((bdp->status & TXBD_READY) == 0) */
1518
1519         dev->stats.tx_packets += howmany;
1520
1521         return howmany;
1522 }
1523
1524 /* Interrupt Handler for Transmit complete */
1525 static irqreturn_t gfar_transmit(int irq, void *dev_id)
1526 {
1527         struct net_device *dev = (struct net_device *) dev_id;
1528         struct gfar_private *priv = netdev_priv(dev);
1529
1530         /* Clear IEVENT */
1531         gfar_write(&priv->regs->ievent, IEVENT_TX_MASK);
1532
1533         /* Lock priv */
1534         spin_lock(&priv->txlock);
1535
1536         gfar_clean_tx_ring(dev);
1537
1538         /* If we are coalescing the interrupts, reset the timer */
1539         /* Otherwise, clear it */
1540         if (likely(priv->txcoalescing)) {
1541                 gfar_write(&priv->regs->txic, 0);
1542                 gfar_write(&priv->regs->txic, priv->txic);
1543         }
1544
1545         spin_unlock(&priv->txlock);
1546
1547         return IRQ_HANDLED;
1548 }
1549
1550 static void gfar_new_rxbdp(struct net_device *dev, struct rxbd8 *bdp,
1551                 struct sk_buff *skb)
1552 {
1553         struct gfar_private *priv = netdev_priv(dev);
1554         u32 * status_len = (u32 *)bdp;
1555         u16 flags;
1556
1557         bdp->bufPtr = dma_map_single(&dev->dev, skb->data,
1558                         priv->rx_buffer_size, DMA_FROM_DEVICE);
1559
1560         flags = RXBD_EMPTY | RXBD_INTERRUPT;
1561
1562         if (bdp == priv->rx_bd_base + priv->rx_ring_size - 1)
1563                 flags |= RXBD_WRAP;
1564
1565         eieio();
1566
1567         *status_len = (u32)flags << 16;
1568 }
1569
1570
1571 struct sk_buff * gfar_new_skb(struct net_device *dev)
1572 {
1573         unsigned int alignamount;
1574         struct gfar_private *priv = netdev_priv(dev);
1575         struct sk_buff *skb = NULL;
1576
1577         /* We have to allocate the skb, so keep trying till we succeed */
1578         skb = netdev_alloc_skb(dev, priv->rx_buffer_size + RXBUF_ALIGNMENT);
1579
1580         if (!skb)
1581                 return NULL;
1582
1583         alignamount = RXBUF_ALIGNMENT -
1584                 (((unsigned long) skb->data) & (RXBUF_ALIGNMENT - 1));
1585
1586         /* We need the data buffer to be aligned properly.  We will reserve
1587          * as many bytes as needed to align the data properly
1588          */
1589         skb_reserve(skb, alignamount);
1590
1591         return skb;
1592 }
1593
1594 static inline void count_errors(unsigned short status, struct net_device *dev)
1595 {
1596         struct gfar_private *priv = netdev_priv(dev);
1597         struct net_device_stats *stats = &dev->stats;
1598         struct gfar_extra_stats *estats = &priv->extra_stats;
1599
1600         /* If the packet was truncated, none of the other errors
1601          * matter */
1602         if (status & RXBD_TRUNCATED) {
1603                 stats->rx_length_errors++;
1604
1605                 estats->rx_trunc++;
1606
1607                 return;
1608         }
1609         /* Count the errors, if there were any */
1610         if (status & (RXBD_LARGE | RXBD_SHORT)) {
1611                 stats->rx_length_errors++;
1612
1613                 if (status & RXBD_LARGE)
1614                         estats->rx_large++;
1615                 else
1616                         estats->rx_short++;
1617         }
1618         if (status & RXBD_NONOCTET) {
1619                 stats->rx_frame_errors++;
1620                 estats->rx_nonoctet++;
1621         }
1622         if (status & RXBD_CRCERR) {
1623                 estats->rx_crcerr++;
1624                 stats->rx_crc_errors++;
1625         }
1626         if (status & RXBD_OVERRUN) {
1627                 estats->rx_overrun++;
1628                 stats->rx_crc_errors++;
1629         }
1630 }
1631
1632 irqreturn_t gfar_receive(int irq, void *dev_id)
1633 {
1634         struct net_device *dev = (struct net_device *) dev_id;
1635         struct gfar_private *priv = netdev_priv(dev);
1636         u32 tempval;
1637
1638         /* support NAPI */
1639         /* Clear IEVENT, so interrupts aren't called again
1640          * because of the packets that have already arrived */
1641         gfar_write(&priv->regs->ievent, IEVENT_RTX_MASK);
1642
1643         if (netif_rx_schedule_prep(dev, &priv->napi)) {
1644                 tempval = gfar_read(&priv->regs->imask);
1645                 tempval &= IMASK_RTX_DISABLED;
1646                 gfar_write(&priv->regs->imask, tempval);
1647
1648                 __netif_rx_schedule(dev, &priv->napi);
1649         } else {
1650                 if (netif_msg_rx_err(priv))
1651                         printk(KERN_DEBUG "%s: receive called twice (%x)[%x]\n",
1652                                 dev->name, gfar_read(&priv->regs->ievent),
1653                                 gfar_read(&priv->regs->imask));
1654         }
1655
1656         return IRQ_HANDLED;
1657 }
1658
1659 static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
1660 {
1661         /* If valid headers were found, and valid sums
1662          * were verified, then we tell the kernel that no
1663          * checksumming is necessary.  Otherwise, it is */
1664         if ((fcb->flags & RXFCB_CSUM_MASK) == (RXFCB_CIP | RXFCB_CTU))
1665                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1666         else
1667                 skb->ip_summed = CHECKSUM_NONE;
1668 }
1669
1670
1671 static inline struct rxfcb *gfar_get_fcb(struct sk_buff *skb)
1672 {
1673         struct rxfcb *fcb = (struct rxfcb *)skb->data;
1674
1675         /* Remove the FCB from the skb */
1676         skb_pull(skb, GMAC_FCB_LEN);
1677
1678         return fcb;
1679 }
1680
1681 /* gfar_process_frame() -- handle one incoming packet if skb
1682  * isn't NULL.  */
1683 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
1684                 int length)
1685 {
1686         struct gfar_private *priv = netdev_priv(dev);
1687         struct rxfcb *fcb = NULL;
1688
1689         if (NULL == skb) {
1690                 if (netif_msg_rx_err(priv))
1691                         printk(KERN_WARNING "%s: Missing skb!!.\n", dev->name);
1692                 dev->stats.rx_dropped++;
1693                 priv->extra_stats.rx_skbmissing++;
1694         } else {
1695                 int ret;
1696
1697                 /* Prep the skb for the packet */
1698                 skb_put(skb, length);
1699
1700                 /* Grab the FCB if there is one */
1701                 if (gfar_uses_fcb(priv))
1702                         fcb = gfar_get_fcb(skb);
1703
1704                 /* Remove the padded bytes, if there are any */
1705                 if (priv->padding)
1706                         skb_pull(skb, priv->padding);
1707
1708                 if (priv->rx_csum_enable)
1709                         gfar_rx_checksum(skb, fcb);
1710
1711                 /* Tell the skb what kind of packet this is */
1712                 skb->protocol = eth_type_trans(skb, dev);
1713
1714                 /* Send the packet up the stack */
1715                 if (unlikely(priv->vlgrp && (fcb->flags & RXFCB_VLN))) {
1716                         ret = vlan_hwaccel_receive_skb(skb, priv->vlgrp,
1717                                                        fcb->vlctl);
1718                 } else
1719                         ret = netif_receive_skb(skb);
1720
1721                 if (NET_RX_DROP == ret)
1722                         priv->extra_stats.kernel_dropped++;
1723         }
1724
1725         return 0;
1726 }
1727
1728 /* gfar_clean_rx_ring() -- Processes each frame in the rx ring
1729  *   until the budget/quota has been reached. Returns the number
1730  *   of frames handled
1731  */
1732 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
1733 {
1734         struct rxbd8 *bdp;
1735         struct sk_buff *skb;
1736         u16 pkt_len;
1737         int howmany = 0;
1738         struct gfar_private *priv = netdev_priv(dev);
1739
1740         /* Get the first full descriptor */
1741         bdp = priv->cur_rx;
1742
1743         while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
1744                 struct sk_buff *newskb;
1745                 rmb();
1746
1747                 /* Add another skb for the future */
1748                 newskb = gfar_new_skb(dev);
1749
1750                 skb = priv->rx_skbuff[priv->skb_currx];
1751
1752                 dma_unmap_single(&priv->dev->dev, bdp->bufPtr,
1753                                 priv->rx_buffer_size, DMA_FROM_DEVICE);
1754
1755                 /* We drop the frame if we failed to allocate a new buffer */
1756                 if (unlikely(!newskb || !(bdp->status & RXBD_LAST) ||
1757                                  bdp->status & RXBD_ERR)) {
1758                         count_errors(bdp->status, dev);
1759
1760                         if (unlikely(!newskb))
1761                                 newskb = skb;
1762
1763                         if (skb)
1764                                 dev_kfree_skb_any(skb);
1765                 } else {
1766                         /* Increment the number of packets */
1767                         dev->stats.rx_packets++;
1768                         howmany++;
1769
1770                         /* Remove the FCS from the packet length */
1771                         pkt_len = bdp->length - 4;
1772
1773                         gfar_process_frame(dev, skb, pkt_len);
1774
1775                         dev->stats.rx_bytes += pkt_len;
1776                 }
1777
1778                 priv->rx_skbuff[priv->skb_currx] = newskb;
1779
1780                 /* Setup the new bdp */
1781                 gfar_new_rxbdp(dev, bdp, newskb);
1782
1783                 /* Update to the next pointer */
1784                 if (bdp->status & RXBD_WRAP)
1785                         bdp = priv->rx_bd_base;
1786                 else
1787                         bdp++;
1788
1789                 /* update to point at the next skb */
1790                 priv->skb_currx =
1791                     (priv->skb_currx + 1) &
1792                     RX_RING_MOD_MASK(priv->rx_ring_size);
1793         }
1794
1795         /* Update the current rxbd pointer to be the next one */
1796         priv->cur_rx = bdp;
1797
1798         return howmany;
1799 }
1800
1801 static int gfar_poll(struct napi_struct *napi, int budget)
1802 {
1803         struct gfar_private *priv = container_of(napi, struct gfar_private, napi);
1804         struct net_device *dev = priv->dev;
1805         int howmany;
1806         unsigned long flags;
1807
1808         /* If we fail to get the lock, don't bother with the TX BDs */
1809         if (spin_trylock_irqsave(&priv->txlock, flags)) {
1810                 gfar_clean_tx_ring(dev);
1811                 spin_unlock_irqrestore(&priv->txlock, flags);
1812         }
1813
1814         howmany = gfar_clean_rx_ring(dev, budget);
1815
1816         if (howmany < budget) {
1817                 netif_rx_complete(dev, napi);
1818
1819                 /* Clear the halt bit in RSTAT */
1820                 gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
1821
1822                 gfar_write(&priv->regs->imask, IMASK_DEFAULT);
1823
1824                 /* If we are coalescing interrupts, update the timer */
1825                 /* Otherwise, clear it */
1826                 if (likely(priv->rxcoalescing)) {
1827                         gfar_write(&priv->regs->rxic, 0);
1828                         gfar_write(&priv->regs->rxic, priv->rxic);
1829                 }
1830         }
1831
1832         return howmany;
1833 }
1834
1835 #ifdef CONFIG_NET_POLL_CONTROLLER
1836 /*
1837  * Polling 'interrupt' - used by things like netconsole to send skbs
1838  * without having to re-enable interrupts. It's not called while
1839  * the interrupt routine is executing.
1840  */
1841 static void gfar_netpoll(struct net_device *dev)
1842 {
1843         struct gfar_private *priv = netdev_priv(dev);
1844
1845         /* If the device has multiple interrupts, run tx/rx */
1846         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
1847                 disable_irq(priv->interruptTransmit);
1848                 disable_irq(priv->interruptReceive);
1849                 disable_irq(priv->interruptError);
1850                 gfar_interrupt(priv->interruptTransmit, dev);
1851                 enable_irq(priv->interruptError);
1852                 enable_irq(priv->interruptReceive);
1853                 enable_irq(priv->interruptTransmit);
1854         } else {
1855                 disable_irq(priv->interruptTransmit);
1856                 gfar_interrupt(priv->interruptTransmit, dev);
1857                 enable_irq(priv->interruptTransmit);
1858         }
1859 }
1860 #endif
1861
1862 /* The interrupt handler for devices with one interrupt */
1863 static irqreturn_t gfar_interrupt(int irq, void *dev_id)
1864 {
1865         struct net_device *dev = dev_id;
1866         struct gfar_private *priv = netdev_priv(dev);
1867
1868         /* Save ievent for future reference */
1869         u32 events = gfar_read(&priv->regs->ievent);
1870
1871         /* Check for reception */
1872         if (events & IEVENT_RX_MASK)
1873                 gfar_receive(irq, dev_id);
1874
1875         /* Check for transmit completion */
1876         if (events & IEVENT_TX_MASK)
1877                 gfar_transmit(irq, dev_id);
1878
1879         /* Check for errors */
1880         if (events & IEVENT_ERR_MASK)
1881                 gfar_error(irq, dev_id);
1882
1883         return IRQ_HANDLED;
1884 }
1885
1886 /* Called every time the controller might need to be made
1887  * aware of new link state.  The PHY code conveys this
1888  * information through variables in the phydev structure, and this
1889  * function converts those variables into the appropriate
1890  * register values, and can bring down the device if needed.
1891  */
1892 static void adjust_link(struct net_device *dev)
1893 {
1894         struct gfar_private *priv = netdev_priv(dev);
1895         struct gfar __iomem *regs = priv->regs;
1896         unsigned long flags;
1897         struct phy_device *phydev = priv->phydev;
1898         int new_state = 0;
1899
1900         spin_lock_irqsave(&priv->txlock, flags);
1901         if (phydev->link) {
1902                 u32 tempval = gfar_read(&regs->maccfg2);
1903                 u32 ecntrl = gfar_read(&regs->ecntrl);
1904
1905                 /* Now we make sure that we can be in full duplex mode.
1906                  * If not, we operate in half-duplex mode. */
1907                 if (phydev->duplex != priv->oldduplex) {
1908                         new_state = 1;
1909                         if (!(phydev->duplex))
1910                                 tempval &= ~(MACCFG2_FULL_DUPLEX);
1911                         else
1912                                 tempval |= MACCFG2_FULL_DUPLEX;
1913
1914                         priv->oldduplex = phydev->duplex;
1915                 }
1916
1917                 if (phydev->speed != priv->oldspeed) {
1918                         new_state = 1;
1919                         switch (phydev->speed) {
1920                         case 1000:
1921                                 tempval =
1922                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_GMII);
1923                                 break;
1924                         case 100:
1925                         case 10:
1926                                 tempval =
1927                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_MII);
1928
1929                                 /* Reduced mode distinguishes
1930                                  * between 10 and 100 */
1931                                 if (phydev->speed == SPEED_100)
1932                                         ecntrl |= ECNTRL_R100;
1933                                 else
1934                                         ecntrl &= ~(ECNTRL_R100);
1935                                 break;
1936                         default:
1937                                 if (netif_msg_link(priv))
1938                                         printk(KERN_WARNING
1939                                                 "%s: Ack!  Speed (%d) is not 10/100/1000!\n",
1940                                                 dev->name, phydev->speed);
1941                                 break;
1942                         }
1943
1944                         priv->oldspeed = phydev->speed;
1945                 }
1946
1947                 gfar_write(&regs->maccfg2, tempval);
1948                 gfar_write(&regs->ecntrl, ecntrl);
1949
1950                 if (!priv->oldlink) {
1951                         new_state = 1;
1952                         priv->oldlink = 1;
1953                 }
1954         } else if (priv->oldlink) {
1955                 new_state = 1;
1956                 priv->oldlink = 0;
1957                 priv->oldspeed = 0;
1958                 priv->oldduplex = -1;
1959         }
1960
1961         if (new_state && netif_msg_link(priv))
1962                 phy_print_status(phydev);
1963
1964         spin_unlock_irqrestore(&priv->txlock, flags);
1965 }
1966
1967 /* Update the hash table based on the current list of multicast
1968  * addresses we subscribe to.  Also, change the promiscuity of
1969  * the device based on the flags (this function is called
1970  * whenever dev->flags is changed */
1971 static void gfar_set_multi(struct net_device *dev)
1972 {
1973         struct dev_mc_list *mc_ptr;
1974         struct gfar_private *priv = netdev_priv(dev);
1975         struct gfar __iomem *regs = priv->regs;
1976         u32 tempval;
1977
1978         if(dev->flags & IFF_PROMISC) {
1979                 /* Set RCTRL to PROM */
1980                 tempval = gfar_read(&regs->rctrl);
1981                 tempval |= RCTRL_PROM;
1982                 gfar_write(&regs->rctrl, tempval);
1983         } else {
1984                 /* Set RCTRL to not PROM */
1985                 tempval = gfar_read(&regs->rctrl);
1986                 tempval &= ~(RCTRL_PROM);
1987                 gfar_write(&regs->rctrl, tempval);
1988         }
1989
1990         if(dev->flags & IFF_ALLMULTI) {
1991                 /* Set the hash to rx all multicast frames */
1992                 gfar_write(&regs->igaddr0, 0xffffffff);
1993                 gfar_write(&regs->igaddr1, 0xffffffff);
1994                 gfar_write(&regs->igaddr2, 0xffffffff);
1995                 gfar_write(&regs->igaddr3, 0xffffffff);
1996                 gfar_write(&regs->igaddr4, 0xffffffff);
1997                 gfar_write(&regs->igaddr5, 0xffffffff);
1998                 gfar_write(&regs->igaddr6, 0xffffffff);
1999                 gfar_write(&regs->igaddr7, 0xffffffff);
2000                 gfar_write(&regs->gaddr0, 0xffffffff);
2001                 gfar_write(&regs->gaddr1, 0xffffffff);
2002                 gfar_write(&regs->gaddr2, 0xffffffff);
2003                 gfar_write(&regs->gaddr3, 0xffffffff);
2004                 gfar_write(&regs->gaddr4, 0xffffffff);
2005                 gfar_write(&regs->gaddr5, 0xffffffff);
2006                 gfar_write(&regs->gaddr6, 0xffffffff);
2007                 gfar_write(&regs->gaddr7, 0xffffffff);
2008         } else {
2009                 int em_num;
2010                 int idx;
2011
2012                 /* zero out the hash */
2013                 gfar_write(&regs->igaddr0, 0x0);
2014                 gfar_write(&regs->igaddr1, 0x0);
2015                 gfar_write(&regs->igaddr2, 0x0);
2016                 gfar_write(&regs->igaddr3, 0x0);
2017                 gfar_write(&regs->igaddr4, 0x0);
2018                 gfar_write(&regs->igaddr5, 0x0);
2019                 gfar_write(&regs->igaddr6, 0x0);
2020                 gfar_write(&regs->igaddr7, 0x0);
2021                 gfar_write(&regs->gaddr0, 0x0);
2022                 gfar_write(&regs->gaddr1, 0x0);
2023                 gfar_write(&regs->gaddr2, 0x0);
2024                 gfar_write(&regs->gaddr3, 0x0);
2025                 gfar_write(&regs->gaddr4, 0x0);
2026                 gfar_write(&regs->gaddr5, 0x0);
2027                 gfar_write(&regs->gaddr6, 0x0);
2028                 gfar_write(&regs->gaddr7, 0x0);
2029
2030                 /* If we have extended hash tables, we need to
2031                  * clear the exact match registers to prepare for
2032                  * setting them */
2033                 if (priv->extended_hash) {
2034                         em_num = GFAR_EM_NUM + 1;
2035                         gfar_clear_exact_match(dev);
2036                         idx = 1;
2037                 } else {
2038                         idx = 0;
2039                         em_num = 0;
2040                 }
2041
2042                 if(dev->mc_count == 0)
2043                         return;
2044
2045                 /* Parse the list, and set the appropriate bits */
2046                 for(mc_ptr = dev->mc_list; mc_ptr; mc_ptr = mc_ptr->next) {
2047                         if (idx < em_num) {
2048                                 gfar_set_mac_for_addr(dev, idx,
2049                                                 mc_ptr->dmi_addr);
2050                                 idx++;
2051                         } else
2052                                 gfar_set_hash_for_addr(dev, mc_ptr->dmi_addr);
2053                 }
2054         }
2055
2056         return;
2057 }
2058
2059
2060 /* Clears each of the exact match registers to zero, so they
2061  * don't interfere with normal reception */
2062 static void gfar_clear_exact_match(struct net_device *dev)
2063 {
2064         int idx;
2065         u8 zero_arr[MAC_ADDR_LEN] = {0,0,0,0,0,0};
2066
2067         for(idx = 1;idx < GFAR_EM_NUM + 1;idx++)
2068                 gfar_set_mac_for_addr(dev, idx, (u8 *)zero_arr);
2069 }
2070
2071 /* Set the appropriate hash bit for the given addr */
2072 /* The algorithm works like so:
2073  * 1) Take the Destination Address (ie the multicast address), and
2074  * do a CRC on it (little endian), and reverse the bits of the
2075  * result.
2076  * 2) Use the 8 most significant bits as a hash into a 256-entry
2077  * table.  The table is controlled through 8 32-bit registers:
2078  * gaddr0-7.  gaddr0's MSB is entry 0, and gaddr7's LSB is
2079  * gaddr7.  This means that the 3 most significant bits in the
2080  * hash index which gaddr register to use, and the 5 other bits
2081  * indicate which bit (assuming an IBM numbering scheme, which
2082  * for PowerPC (tm) is usually the case) in the register holds
2083  * the entry. */
2084 static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr)
2085 {
2086         u32 tempval;
2087         struct gfar_private *priv = netdev_priv(dev);
2088         u32 result = ether_crc(MAC_ADDR_LEN, addr);
2089         int width = priv->hash_width;
2090         u8 whichbit = (result >> (32 - width)) & 0x1f;
2091         u8 whichreg = result >> (32 - width + 5);
2092         u32 value = (1 << (31-whichbit));
2093
2094         tempval = gfar_read(priv->hash_regs[whichreg]);
2095         tempval |= value;
2096         gfar_write(priv->hash_regs[whichreg], tempval);
2097
2098         return;
2099 }
2100
2101
2102 /* There are multiple MAC Address register pairs on some controllers
2103  * This function sets the numth pair to a given address
2104  */
2105 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr)
2106 {
2107         struct gfar_private *priv = netdev_priv(dev);
2108         int idx;
2109         char tmpbuf[MAC_ADDR_LEN];
2110         u32 tempval;
2111         u32 __iomem *macptr = &priv->regs->macstnaddr1;
2112
2113         macptr += num*2;
2114
2115         /* Now copy it into the mac registers backwards, cuz */
2116         /* little endian is silly */
2117         for (idx = 0; idx < MAC_ADDR_LEN; idx++)
2118                 tmpbuf[MAC_ADDR_LEN - 1 - idx] = addr[idx];
2119
2120         gfar_write(macptr, *((u32 *) (tmpbuf)));
2121
2122         tempval = *((u32 *) (tmpbuf + 4));
2123
2124         gfar_write(macptr+1, tempval);
2125 }
2126
2127 /* GFAR error interrupt handler */
2128 static irqreturn_t gfar_error(int irq, void *dev_id)
2129 {
2130         struct net_device *dev = dev_id;
2131         struct gfar_private *priv = netdev_priv(dev);
2132
2133         /* Save ievent for future reference */
2134         u32 events = gfar_read(&priv->regs->ievent);
2135
2136         /* Clear IEVENT */
2137         gfar_write(&priv->regs->ievent, events & IEVENT_ERR_MASK);
2138
2139         /* Magic Packet is not an error. */
2140         if ((priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET) &&
2141             (events & IEVENT_MAG))
2142                 events &= ~IEVENT_MAG;
2143
2144         /* Hmm... */
2145         if (netif_msg_rx_err(priv) || netif_msg_tx_err(priv))
2146                 printk(KERN_DEBUG "%s: error interrupt (ievent=0x%08x imask=0x%08x)\n",
2147                        dev->name, events, gfar_read(&priv->regs->imask));
2148
2149         /* Update the error counters */
2150         if (events & IEVENT_TXE) {
2151                 dev->stats.tx_errors++;
2152
2153                 if (events & IEVENT_LC)
2154                         dev->stats.tx_window_errors++;
2155                 if (events & IEVENT_CRL)
2156                         dev->stats.tx_aborted_errors++;
2157                 if (events & IEVENT_XFUN) {
2158                         if (netif_msg_tx_err(priv))
2159                                 printk(KERN_DEBUG "%s: TX FIFO underrun, "
2160                                        "packet dropped.\n", dev->name);
2161                         dev->stats.tx_dropped++;
2162                         priv->extra_stats.tx_underrun++;
2163
2164                         /* Reactivate the Tx Queues */
2165                         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
2166                 }
2167                 if (netif_msg_tx_err(priv))
2168                         printk(KERN_DEBUG "%s: Transmit Error\n", dev->name);
2169         }
2170         if (events & IEVENT_BSY) {
2171                 dev->stats.rx_errors++;
2172                 priv->extra_stats.rx_bsy++;
2173
2174                 gfar_receive(irq, dev_id);
2175
2176                 if (netif_msg_rx_err(priv))
2177                         printk(KERN_DEBUG "%s: busy error (rstat: %x)\n",
2178                                dev->name, gfar_read(&priv->regs->rstat));
2179         }
2180         if (events & IEVENT_BABR) {
2181                 dev->stats.rx_errors++;
2182                 priv->extra_stats.rx_babr++;
2183
2184                 if (netif_msg_rx_err(priv))
2185                         printk(KERN_DEBUG "%s: babbling RX error\n", dev->name);
2186         }
2187         if (events & IEVENT_EBERR) {
2188                 priv->extra_stats.eberr++;
2189                 if (netif_msg_rx_err(priv))
2190                         printk(KERN_DEBUG "%s: bus error\n", dev->name);
2191         }
2192         if ((events & IEVENT_RXC) && netif_msg_rx_status(priv))
2193                 printk(KERN_DEBUG "%s: control frame\n", dev->name);
2194
2195         if (events & IEVENT_BABT) {
2196                 priv->extra_stats.tx_babt++;
2197                 if (netif_msg_tx_err(priv))
2198                         printk(KERN_DEBUG "%s: babbling TX error\n", dev->name);
2199         }
2200         return IRQ_HANDLED;
2201 }
2202
2203 /* work with hotplug and coldplug */
2204 MODULE_ALIAS("platform:fsl-gianfar");
2205
2206 static struct of_device_id gfar_match[] =
2207 {
2208         {
2209                 .type = "network",
2210                 .compatible = "gianfar",
2211         },
2212         {},
2213 };
2214
2215 /* Structure for a device driver */
2216 static struct of_platform_driver gfar_driver = {
2217         .name = "fsl-gianfar",
2218         .match_table = gfar_match,
2219
2220         .probe = gfar_probe,
2221         .remove = gfar_remove,
2222         .suspend = gfar_suspend,
2223         .resume = gfar_resume,
2224 };
2225
2226 static int __init gfar_init(void)
2227 {
2228         int err = gfar_mdio_init();
2229
2230         if (err)
2231                 return err;
2232
2233         err = of_register_platform_driver(&gfar_driver);
2234
2235         if (err)
2236                 gfar_mdio_exit();
2237
2238         return err;
2239 }
2240
2241 static void __exit gfar_exit(void)
2242 {
2243         of_unregister_platform_driver(&gfar_driver);
2244         gfar_mdio_exit();
2245 }
2246
2247 module_init(gfar_init);
2248 module_exit(gfar_exit);
2249