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   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,
 135                               int amount_pull);
 136 static void gfar_vlan_rx_register(struct net_device *netdev,
 137                                 struct vlan_group *grp);
 138 void gfar_halt(struct net_device *dev);
 139 static void gfar_halt_nodisable(struct net_device *dev);
 140 void gfar_start(struct net_device *dev);
 141 static void gfar_clear_exact_match(struct net_device *dev);
 142 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr);
 143
 144 extern const struct ethtool_ops gfar_ethtool_ops;
 145
 146 MODULE_AUTHOR("Freescale Semiconductor, Inc");
 147 MODULE_DESCRIPTION("Gianfar Ethernet Driver");
 148 MODULE_LICENSE("GPL");
 149
 150 /* Returns 1 if incoming frames use an FCB */
 151 static inline int gfar_uses_fcb(struct gfar_private *priv)
 152 {
 153         return priv->vlgrp || priv->rx_csum_enable;
 154 }
 155
 156 static int gfar_of_init(struct net_device *dev)
 157 {
 158         struct device_node *phy, *mdio;
 159         const unsigned int *id;
 160         const char *model;
 161         const char *ctype;
 162         const void *mac_addr;
 163         const phandle *ph;
 164         u64 addr, size;
 165         int err = 0;
 166         struct gfar_private *priv = netdev_priv(dev);
 167         struct device_node *np = priv->node;
 168         char bus_name[MII_BUS_ID_SIZE];
 169
 170         if (!np || !of_device_is_available(np))
 171                 return -ENODEV;
 172
 173         /* get a pointer to the register memory */
 174         addr = of_translate_address(np, of_get_address(np, 0, &size, NULL));
 175         priv->regs = ioremap(addr, size);
 176
 177         if (priv->regs == NULL)
 178                 return -ENOMEM;
 179
 180         priv->interruptTransmit = irq_of_parse_and_map(np, 0);
 181
 182         model = of_get_property(np, "model", NULL);
 183
 184         /* If we aren't the FEC we have multiple interrupts */
 185         if (model && strcasecmp(model, "FEC")) {
 186                 priv->interruptReceive = irq_of_parse_and_map(np, 1);
 187
 188                 priv->interruptError = irq_of_parse_and_map(np, 2);
 189
 190                 if (priv->interruptTransmit < 0 ||
 191                                 priv->interruptReceive < 0 ||
 192                                 priv->interruptError < 0) {
 193                         err = -EINVAL;
 194                         goto err_out;
 195                 }
 196         }
 197
 198         mac_addr = of_get_mac_address(np);
 199         if (mac_addr)
 200                 memcpy(dev->dev_addr, mac_addr, MAC_ADDR_LEN);
 201
 202         if (model && !strcasecmp(model, "TSEC"))
 203                 priv->device_flags =
 204                         FSL_GIANFAR_DEV_HAS_GIGABIT |
 205                         FSL_GIANFAR_DEV_HAS_COALESCE |
 206                         FSL_GIANFAR_DEV_HAS_RMON |
 207                         FSL_GIANFAR_DEV_HAS_MULTI_INTR;
 208         if (model && !strcasecmp(model, "eTSEC"))
 209                 priv->device_flags =
 210                         FSL_GIANFAR_DEV_HAS_GIGABIT |
 211                         FSL_GIANFAR_DEV_HAS_COALESCE |
 212                         FSL_GIANFAR_DEV_HAS_RMON |
 213                         FSL_GIANFAR_DEV_HAS_MULTI_INTR |
 214                         FSL_GIANFAR_DEV_HAS_PADDING |
 215                         FSL_GIANFAR_DEV_HAS_CSUM |
 216                         FSL_GIANFAR_DEV_HAS_VLAN |
 217                         FSL_GIANFAR_DEV_HAS_MAGIC_PACKET |
 218                         FSL_GIANFAR_DEV_HAS_EXTENDED_HASH;
 219
 220         ctype = of_get_property(np, "phy-connection-type", NULL);
 221
 222         /* We only care about rgmii-id.  The rest are autodetected */
 223         if (ctype && !strcmp(ctype, "rgmii-id"))
 224                 priv->interface = PHY_INTERFACE_MODE_RGMII_ID;
 225         else
 226                 priv->interface = PHY_INTERFACE_MODE_MII;
 227
 228         if (of_get_property(np, "fsl,magic-packet", NULL))
 229                 priv->device_flags |= FSL_GIANFAR_DEV_HAS_MAGIC_PACKET;
 230
 231         ph = of_get_property(np, "phy-handle", NULL);
 232         if (ph == NULL) {
 233                 u32 *fixed_link;
 234
 235                 fixed_link = (u32 *)of_get_property(np, "fixed-link", NULL);
 236                 if (!fixed_link) {
 237                         err = -ENODEV;
 238                         goto err_out;
 239                 }
 240
 241                 snprintf(priv->phy_bus_id, sizeof(priv->phy_bus_id),
 242                                 PHY_ID_FMT, "0", fixed_link[0]);
 243         } else {
 244                 phy = of_find_node_by_phandle(*ph);
 245
 246                 if (phy == NULL) {
 247                         err = -ENODEV;
 248                         goto err_out;
 249                 }
 250
 251                 mdio = of_get_parent(phy);
 252
 253                 id = of_get_property(phy, "reg", NULL);
 254
 255                 of_node_put(phy);
 256                 of_node_put(mdio);
 257
 258                 gfar_mdio_bus_name(bus_name, mdio);
 259                 snprintf(priv->phy_bus_id, sizeof(priv->phy_bus_id), "%s:%02x",
 260                                 bus_name, *id);
 261         }
 262
 263         /* Find the TBI PHY.  If it's not there, we don't support SGMII */
 264         ph = of_get_property(np, "tbi-handle", NULL);
 265         if (ph) {
 266                 struct device_node *tbi = of_find_node_by_phandle(*ph);
 267                 struct of_device *ofdev;
 268                 struct mii_bus *bus;
 269
 270                 if (!tbi)
 271                         return 0;
 272
 273                 mdio = of_get_parent(tbi);
 274                 if (!mdio)
 275                         return 0;
 276
 277                 ofdev = of_find_device_by_node(mdio);
 278
 279                 of_node_put(mdio);
 280
 281                 id = of_get_property(tbi, "reg", NULL);
 282                 if (!id)
 283                         return 0;
 284
 285                 of_node_put(tbi);
 286
 287                 bus = dev_get_drvdata(&ofdev->dev);
 288
 289                 priv->tbiphy = bus->phy_map[*id];
 290         }
 291
 292         return 0;
 293
 294 err_out:
 295         iounmap(priv->regs);
 296         return err;
 297 }
 298
 299 /* Ioctl MII Interface */
 300 static int gfar_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 301 {
 302         struct gfar_private *priv = netdev_priv(dev);
 303
 304         if (!netif_running(dev))
 305                 return -EINVAL;
 306
 307         if (!priv->phydev)
 308                 return -ENODEV;
 309
 310         return phy_mii_ioctl(priv->phydev, if_mii(rq), cmd);
 311 }
 312
 313 /* Set up the ethernet device structure, private data,
 314  * and anything else we need before we start */
 315 static int gfar_probe(struct of_device *ofdev,
 316                 const struct of_device_id *match)
 317 {
 318         u32 tempval;
 319         struct net_device *dev = NULL;
 320         struct gfar_private *priv = NULL;
 321         DECLARE_MAC_BUF(mac);
 322         int err = 0;
 323         int len_devname;
 324
 325         /* Create an ethernet device instance */
 326         dev = alloc_etherdev(sizeof (*priv));
 327
 328         if (NULL == dev)
 329                 return -ENOMEM;
 330
 331         priv = netdev_priv(dev);
 332         priv->dev = dev;
 333         priv->node = ofdev->node;
 334
 335         err = gfar_of_init(dev);
 336
 337         if (err)
 338                 goto regs_fail;
 339
 340         spin_lock_init(&priv->txlock);
 341         spin_lock_init(&priv->rxlock);
 342         spin_lock_init(&priv->bflock);
 343         INIT_WORK(&priv->reset_task, gfar_reset_task);
 344
 345         dev_set_drvdata(&ofdev->dev, priv);
 346
 347         /* Stop the DMA engine now, in case it was running before */
 348         /* (The firmware could have used it, and left it running). */
 349         gfar_halt(dev);
 350
 351         /* Reset MAC layer */
 352         gfar_write(&priv->regs->maccfg1, MACCFG1_SOFT_RESET);
 353
 354         tempval = (MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
 355         gfar_write(&priv->regs->maccfg1, tempval);
 356
 357         /* Initialize MACCFG2. */
 358         gfar_write(&priv->regs->maccfg2, MACCFG2_INIT_SETTINGS);
 359
 360         /* Initialize ECNTRL */
 361         gfar_write(&priv->regs->ecntrl, ECNTRL_INIT_SETTINGS);
 362
 363         /* Set the dev->base_addr to the gfar reg region */
 364         dev->base_addr = (unsigned long) (priv->regs);
 365
 366         SET_NETDEV_DEV(dev, &ofdev->dev);
 367
 368         /* Fill in the dev structure */
 369         dev->open = gfar_enet_open;
 370         dev->hard_start_xmit = gfar_start_xmit;
 371         dev->tx_timeout = gfar_timeout;
 372         dev->watchdog_timeo = TX_TIMEOUT;
 373         netif_napi_add(dev, &priv->napi, gfar_poll, GFAR_DEV_WEIGHT);
 374 #ifdef CONFIG_NET_POLL_CONTROLLER
 375         dev->poll_controller = gfar_netpoll;
 376 #endif
 377         dev->stop = gfar_close;
 378         dev->change_mtu = gfar_change_mtu;
 379         dev->mtu = 1500;
 380         dev->set_multicast_list = gfar_set_multi;
 381
 382         dev->ethtool_ops = &gfar_ethtool_ops;
 383         dev->do_ioctl = gfar_ioctl;
 384
 385         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_CSUM) {
 386                 priv->rx_csum_enable = 1;
 387                 dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA;
 388         } else
 389                 priv->rx_csum_enable = 0;
 390
 391         priv->vlgrp = NULL;
 392
 393         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_VLAN) {
 394                 dev->vlan_rx_register = gfar_vlan_rx_register;
 395
 396                 dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
 397         }
 398
 399         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_EXTENDED_HASH) {
 400                 priv->extended_hash = 1;
 401                 priv->hash_width = 9;
 402
 403                 priv->hash_regs[0] = &priv->regs->igaddr0;
 404                 priv->hash_regs[1] = &priv->regs->igaddr1;
 405                 priv->hash_regs[2] = &priv->regs->igaddr2;
 406                 priv->hash_regs[3] = &priv->regs->igaddr3;
 407                 priv->hash_regs[4] = &priv->regs->igaddr4;
 408                 priv->hash_regs[5] = &priv->regs->igaddr5;
 409                 priv->hash_regs[6] = &priv->regs->igaddr6;
 410                 priv->hash_regs[7] = &priv->regs->igaddr7;
 411                 priv->hash_regs[8] = &priv->regs->gaddr0;
 412                 priv->hash_regs[9] = &priv->regs->gaddr1;
 413                 priv->hash_regs[10] = &priv->regs->gaddr2;
 414                 priv->hash_regs[11] = &priv->regs->gaddr3;
 415                 priv->hash_regs[12] = &priv->regs->gaddr4;
 416                 priv->hash_regs[13] = &priv->regs->gaddr5;
 417                 priv->hash_regs[14] = &priv->regs->gaddr6;
 418                 priv->hash_regs[15] = &priv->regs->gaddr7;
 419
 420         } else {
 421                 priv->extended_hash = 0;
 422                 priv->hash_width = 8;
 423
 424                 priv->hash_regs[0] = &priv->regs->gaddr0;
 425                 priv->hash_regs[1] = &priv->regs->gaddr1;
 426                 priv->hash_regs[2] = &priv->regs->gaddr2;
 427                 priv->hash_regs[3] = &priv->regs->gaddr3;
 428                 priv->hash_regs[4] = &priv->regs->gaddr4;
 429                 priv->hash_regs[5] = &priv->regs->gaddr5;
 430                 priv->hash_regs[6] = &priv->regs->gaddr6;
 431                 priv->hash_regs[7] = &priv->regs->gaddr7;
 432         }
 433
 434         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_PADDING)
 435                 priv->padding = DEFAULT_PADDING;
 436         else
 437                 priv->padding = 0;
 438
 439         if (dev->features & NETIF_F_IP_CSUM)
 440                 dev->hard_header_len += GMAC_FCB_LEN;
 441
 442         priv->rx_buffer_size = DEFAULT_RX_BUFFER_SIZE;
 443         priv->tx_ring_size = DEFAULT_TX_RING_SIZE;
 444         priv->rx_ring_size = DEFAULT_RX_RING_SIZE;
 445         priv->num_txbdfree = DEFAULT_TX_RING_SIZE;
 446
 447         priv->txcoalescing = DEFAULT_TX_COALESCE;
 448         priv->txic = DEFAULT_TXIC;
 449         priv->rxcoalescing = DEFAULT_RX_COALESCE;
 450         priv->rxic = DEFAULT_RXIC;
 451
 452         /* Enable most messages by default */
 453         priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
 454
 455         /* Carrier starts down, phylib will bring it up */
 456         netif_carrier_off(dev);
 457
 458         err = register_netdev(dev);
 459
 460         if (err) {
 461                 printk(KERN_ERR "%s: Cannot register net device, aborting.\n",
 462                                 dev->name);
 463                 goto register_fail;
 464         }
 465
 466         /* fill out IRQ number and name fields */
 467         len_devname = strlen(dev->name);
 468         strncpy(&priv->int_name_tx[0], dev->name, len_devname);
 469         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 470                 strncpy(&priv->int_name_tx[len_devname],
 471                         "_tx", sizeof("_tx") + 1);
 472
 473                 strncpy(&priv->int_name_rx[0], dev->name, len_devname);
 474                 strncpy(&priv->int_name_rx[len_devname],
 475                         "_rx", sizeof("_rx") + 1);
 476
 477                 strncpy(&priv->int_name_er[0], dev->name, len_devname);
 478                 strncpy(&priv->int_name_er[len_devname],
 479                         "_er", sizeof("_er") + 1);
 480         } else
 481                 priv->int_name_tx[len_devname] = '\0';
 482
 483         /* Create all the sysfs files */
 484         gfar_init_sysfs(dev);
 485
 486         /* Print out the device info */
 487         printk(KERN_INFO DEVICE_NAME "%pM\n", dev->name, dev->dev_addr);
 488
 489         /* Even more device info helps when determining which kernel */
 490         /* provided which set of benchmarks. */
 491         printk(KERN_INFO "%s: Running with NAPI enabled\n", dev->name);
 492         printk(KERN_INFO "%s: %d/%d RX/TX BD ring size\n",
 493                dev->name, priv->rx_ring_size, priv->tx_ring_size);
 494
 495         return 0;
 496
 497 register_fail:
 498         iounmap(priv->regs);
 499 regs_fail:
 500         free_netdev(dev);
 501         return err;
 502 }
 503
 504 static int gfar_remove(struct of_device *ofdev)
 505 {
 506         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 507
 508         dev_set_drvdata(&ofdev->dev, NULL);
 509
 510         iounmap(priv->regs);
 511         free_netdev(priv->dev);
 512
 513         return 0;
 514 }
 515
 516 #ifdef CONFIG_PM
 517 static int gfar_suspend(struct of_device *ofdev, pm_message_t state)
 518 {
 519         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 520         struct net_device *dev = priv->dev;
 521         unsigned long flags;
 522         u32 tempval;
 523
 524         int magic_packet = priv->wol_en &&
 525                 (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
 526
 527         netif_device_detach(dev);
 528
 529         if (netif_running(dev)) {
 530                 spin_lock_irqsave(&priv->txlock, flags);
 531                 spin_lock(&priv->rxlock);
 532
 533                 gfar_halt_nodisable(dev);
 534
 535                 /* Disable Tx, and Rx if wake-on-LAN is disabled. */
 536                 tempval = gfar_read(&priv->regs->maccfg1);
 537
 538                 tempval &= ~MACCFG1_TX_EN;
 539
 540                 if (!magic_packet)
 541                         tempval &= ~MACCFG1_RX_EN;
 542
 543                 gfar_write(&priv->regs->maccfg1, tempval);
 544
 545                 spin_unlock(&priv->rxlock);
 546                 spin_unlock_irqrestore(&priv->txlock, flags);
 547
 548                 napi_disable(&priv->napi);
 549
 550                 if (magic_packet) {
 551                         /* Enable interrupt on Magic Packet */
 552                         gfar_write(&priv->regs->imask, IMASK_MAG);
 553
 554                         /* Enable Magic Packet mode */
 555                         tempval = gfar_read(&priv->regs->maccfg2);
 556                         tempval |= MACCFG2_MPEN;
 557                         gfar_write(&priv->regs->maccfg2, tempval);
 558                 } else {
 559                         phy_stop(priv->phydev);
 560                 }
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int gfar_resume(struct of_device *ofdev)
 567 {
 568         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 569         struct net_device *dev = priv->dev;
 570         unsigned long flags;
 571         u32 tempval;
 572         int magic_packet = priv->wol_en &&
 573                 (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
 574
 575         if (!netif_running(dev)) {
 576                 netif_device_attach(dev);
 577                 return 0;
 578         }
 579
 580         if (!magic_packet && priv->phydev)
 581                 phy_start(priv->phydev);
 582
 583         /* Disable Magic Packet mode, in case something
 584          * else woke us up.
 585          */
 586
 587         spin_lock_irqsave(&priv->txlock, flags);
 588         spin_lock(&priv->rxlock);
 589
 590         tempval = gfar_read(&priv->regs->maccfg2);
 591         tempval &= ~MACCFG2_MPEN;
 592         gfar_write(&priv->regs->maccfg2, tempval);
 593
 594         gfar_start(dev);
 595
 596         spin_unlock(&priv->rxlock);
 597         spin_unlock_irqrestore(&priv->txlock, flags);
 598
 599         netif_device_attach(dev);
 600
 601         napi_enable(&priv->napi);
 602
 603         return 0;
 604 }
 605 #else
 606 #define gfar_suspend NULL
 607 #define gfar_resume NULL
 608 #endif
 609
 610 /* Reads the controller's registers to determine what interface
 611  * connects it to the PHY.
 612  */
 613 static phy_interface_t gfar_get_interface(struct net_device *dev)
 614 {
 615         struct gfar_private *priv = netdev_priv(dev);
 616         u32 ecntrl = gfar_read(&priv->regs->ecntrl);
 617
 618         if (ecntrl & ECNTRL_SGMII_MODE)
 619                 return PHY_INTERFACE_MODE_SGMII;
 620
 621         if (ecntrl & ECNTRL_TBI_MODE) {
 622                 if (ecntrl & ECNTRL_REDUCED_MODE)
 623                         return PHY_INTERFACE_MODE_RTBI;
 624                 else
 625                         return PHY_INTERFACE_MODE_TBI;
 626         }
 627
 628         if (ecntrl & ECNTRL_REDUCED_MODE) {
 629                 if (ecntrl & ECNTRL_REDUCED_MII_MODE)
 630                         return PHY_INTERFACE_MODE_RMII;
 631                 else {
 632                         phy_interface_t interface = priv->interface;
 633
 634                         /*
 635                          * This isn't autodetected right now, so it must
 636                          * be set by the device tree or platform code.
 637                          */
 638                         if (interface == PHY_INTERFACE_MODE_RGMII_ID)
 639                                 return PHY_INTERFACE_MODE_RGMII_ID;
 640
 641                         return PHY_INTERFACE_MODE_RGMII;
 642                 }
 643         }
 644
 645         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT)
 646                 return PHY_INTERFACE_MODE_GMII;
 647
 648         return PHY_INTERFACE_MODE_MII;
 649 }
 650
 651
 652 /* Initializes driver's PHY state, and attaches to the PHY.
 653  * Returns 0 on success.
 654  */
 655 static int init_phy(struct net_device *dev)
 656 {
 657         struct gfar_private *priv = netdev_priv(dev);
 658         uint gigabit_support =
 659                 priv->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT ?
 660                 SUPPORTED_1000baseT_Full : 0;
 661         struct phy_device *phydev;
 662         phy_interface_t interface;
 663
 664         priv->oldlink = 0;
 665         priv->oldspeed = 0;
 666         priv->oldduplex = -1;
 667
 668         interface = gfar_get_interface(dev);
 669
 670         phydev = phy_connect(dev, priv->phy_bus_id, &adjust_link, 0, interface);
 671
 672         if (interface == PHY_INTERFACE_MODE_SGMII)
 673                 gfar_configure_serdes(dev);
 674
 675         if (IS_ERR(phydev)) {
 676                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 677                 return PTR_ERR(phydev);
 678         }
 679
 680         /* Remove any features not supported by the controller */
 681         phydev->supported &= (GFAR_SUPPORTED | gigabit_support);
 682         phydev->advertising = phydev->supported;
 683
 684         priv->phydev = phydev;
 685
 686         return 0;
 687 }
 688
 689 /*
 690  * Initialize TBI PHY interface for communicating with the
 691  * SERDES lynx PHY on the chip.  We communicate with this PHY
 692  * through the MDIO bus on each controller, treating it as a
 693  * "normal" PHY at the address found in the TBIPA register.  We assume
 694  * that the TBIPA register is valid.  Either the MDIO bus code will set
 695  * it to a value that doesn't conflict with other PHYs on the bus, or the
 696  * value doesn't matter, as there are no other PHYs on the bus.
 697  */
 698 static void gfar_configure_serdes(struct net_device *dev)
 699 {
 700         struct gfar_private *priv = netdev_priv(dev);
 701
 702         if (!priv->tbiphy) {
 703                 printk(KERN_WARNING "SGMII mode requires that the device "
 704                                 "tree specify a tbi-handle\n");
 705                 return;
 706         }
 707
 708         /*
 709          * If the link is already up, we must already be ok, and don't need to
 710          * configure and reset the TBI<->SerDes link.  Maybe U-Boot configured
 711          * everything for us?  Resetting it takes the link down and requires
 712          * several seconds for it to come back.
 713          */
 714         if (phy_read(priv->tbiphy, MII_BMSR) & BMSR_LSTATUS)
 715                 return;
 716
 717         /* Single clk mode, mii mode off(for serdes communication) */
 718         phy_write(priv->tbiphy, MII_TBICON, TBICON_CLK_SELECT);
 719
 720         phy_write(priv->tbiphy, MII_ADVERTISE,
 721                         ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
 722                         ADVERTISE_1000XPSE_ASYM);
 723
 724         phy_write(priv->tbiphy, MII_BMCR, BMCR_ANENABLE |
 725                         BMCR_ANRESTART | BMCR_FULLDPLX | BMCR_SPEED1000);
 726 }
 727
 728 static void init_registers(struct net_device *dev)
 729 {
 730         struct gfar_private *priv = netdev_priv(dev);
 731
 732         /* Clear IEVENT */
 733         gfar_write(&priv->regs->ievent, IEVENT_INIT_CLEAR);
 734
 735         /* Initialize IMASK */
 736         gfar_write(&priv->regs->imask, IMASK_INIT_CLEAR);
 737
 738         /* Init hash registers to zero */
 739         gfar_write(&priv->regs->igaddr0, 0);
 740         gfar_write(&priv->regs->igaddr1, 0);
 741         gfar_write(&priv->regs->igaddr2, 0);
 742         gfar_write(&priv->regs->igaddr3, 0);
 743         gfar_write(&priv->regs->igaddr4, 0);
 744         gfar_write(&priv->regs->igaddr5, 0);
 745         gfar_write(&priv->regs->igaddr6, 0);
 746         gfar_write(&priv->regs->igaddr7, 0);
 747
 748         gfar_write(&priv->regs->gaddr0, 0);
 749         gfar_write(&priv->regs->gaddr1, 0);
 750         gfar_write(&priv->regs->gaddr2, 0);
 751         gfar_write(&priv->regs->gaddr3, 0);
 752         gfar_write(&priv->regs->gaddr4, 0);
 753         gfar_write(&priv->regs->gaddr5, 0);
 754         gfar_write(&priv->regs->gaddr6, 0);
 755         gfar_write(&priv->regs->gaddr7, 0);
 756
 757         /* Zero out the rmon mib registers if it has them */
 758         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
 759                 memset_io(&(priv->regs->rmon), 0, sizeof (struct rmon_mib));
 760
 761                 /* Mask off the CAM interrupts */
 762                 gfar_write(&priv->regs->rmon.cam1, 0xffffffff);
 763                 gfar_write(&priv->regs->rmon.cam2, 0xffffffff);
 764         }
 765
 766         /* Initialize the max receive buffer length */
 767         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
 768
 769         /* Initialize the Minimum Frame Length Register */
 770         gfar_write(&priv->regs->minflr, MINFLR_INIT_SETTINGS);
 771 }
 772
 773
 774 /* Halt the receive and transmit queues */
 775 static void gfar_halt_nodisable(struct net_device *dev)
 776 {
 777         struct gfar_private *priv = netdev_priv(dev);
 778         struct gfar __iomem *regs = priv->regs;
 779         u32 tempval;
 780
 781         /* Mask all interrupts */
 782         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 783
 784         /* Clear all interrupts */
 785         gfar_write(&regs->ievent, IEVENT_INIT_CLEAR);
 786
 787         /* Stop the DMA, and wait for it to stop */
 788         tempval = gfar_read(&priv->regs->dmactrl);
 789         if ((tempval & (DMACTRL_GRS | DMACTRL_GTS))
 790             != (DMACTRL_GRS | DMACTRL_GTS)) {
 791                 tempval |= (DMACTRL_GRS | DMACTRL_GTS);
 792                 gfar_write(&priv->regs->dmactrl, tempval);
 793
 794                 while (!(gfar_read(&priv->regs->ievent) &
 795                          (IEVENT_GRSC | IEVENT_GTSC)))
 796                         cpu_relax();
 797         }
 798 }
 799
 800 /* Halt the receive and transmit queues */
 801 void gfar_halt(struct net_device *dev)
 802 {
 803         struct gfar_private *priv = netdev_priv(dev);
 804         struct gfar __iomem *regs = priv->regs;
 805         u32 tempval;
 806
 807         gfar_halt_nodisable(dev);
 808
 809         /* Disable Rx and Tx */
 810         tempval = gfar_read(&regs->maccfg1);
 811         tempval &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
 812         gfar_write(&regs->maccfg1, tempval);
 813 }
 814
 815 void stop_gfar(struct net_device *dev)
 816 {
 817         struct gfar_private *priv = netdev_priv(dev);
 818         struct gfar __iomem *regs = priv->regs;
 819         unsigned long flags;
 820
 821         phy_stop(priv->phydev);
 822
 823         /* Lock it down */
 824         spin_lock_irqsave(&priv->txlock, flags);
 825         spin_lock(&priv->rxlock);
 826
 827         gfar_halt(dev);
 828
 829         spin_unlock(&priv->rxlock);
 830         spin_unlock_irqrestore(&priv->txlock, flags);
 831
 832         /* Free the IRQs */
 833         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 834                 free_irq(priv->interruptError, dev);
 835                 free_irq(priv->interruptTransmit, dev);
 836                 free_irq(priv->interruptReceive, dev);
 837         } else {
 838                 free_irq(priv->interruptTransmit, dev);
 839         }
 840
 841         free_skb_resources(priv);
 842
 843         dma_free_coherent(&dev->dev,
 844                         sizeof(struct txbd8)*priv->tx_ring_size
 845                         + sizeof(struct rxbd8)*priv->rx_ring_size,
 846                         priv->tx_bd_base,
 847                         gfar_read(&regs->tbase0));
 848 }
 849
 850 /* If there are any tx skbs or rx skbs still around, free them.
 851  * Then free tx_skbuff and rx_skbuff */
 852 static void free_skb_resources(struct gfar_private *priv)
 853 {
 854         struct rxbd8 *rxbdp;
 855         struct txbd8 *txbdp;
 856         int i, j;
 857
 858         /* Go through all the buffer descriptors and free their data buffers */
 859         txbdp = priv->tx_bd_base;
 860
 861         for (i = 0; i < priv->tx_ring_size; i++) {
 862                 if (!priv->tx_skbuff[i])
 863                         continue;
 864
 865                 dma_unmap_single(&priv->dev->dev, txbdp->bufPtr,
 866                                 txbdp->length, DMA_TO_DEVICE);
 867                 txbdp->lstatus = 0;
 868                 for (j = 0; j < skb_shinfo(priv->tx_skbuff[i])->nr_frags; j++) {
 869                         txbdp++;
 870                         dma_unmap_page(&priv->dev->dev, txbdp->bufPtr,
 871                                         txbdp->length, DMA_TO_DEVICE);
 872                 }
 873                 txbdp++;
 874                 dev_kfree_skb_any(priv->tx_skbuff[i]);
 875                 priv->tx_skbuff[i] = NULL;
 876         }
 877
 878         kfree(priv->tx_skbuff);
 879
 880         rxbdp = priv->rx_bd_base;
 881
 882         /* rx_skbuff is not guaranteed to be allocated, so only
 883          * free it and its contents if it is allocated */
 884         if(priv->rx_skbuff != NULL) {
 885                 for (i = 0; i < priv->rx_ring_size; i++) {
 886                         if (priv->rx_skbuff[i]) {
 887                                 dma_unmap_single(&priv->dev->dev, rxbdp->bufPtr,
 888                                                 priv->rx_buffer_size,
 889                                                 DMA_FROM_DEVICE);
 890
 891                                 dev_kfree_skb_any(priv->rx_skbuff[i]);
 892                                 priv->rx_skbuff[i] = NULL;
 893                         }
 894
 895                         rxbdp->lstatus = 0;
 896                         rxbdp->bufPtr = 0;
 897
 898                         rxbdp++;
 899                 }
 900
 901                 kfree(priv->rx_skbuff);
 902         }
 903 }
 904
 905 void gfar_start(struct net_device *dev)
 906 {
 907         struct gfar_private *priv = netdev_priv(dev);
 908         struct gfar __iomem *regs = priv->regs;
 909         u32 tempval;
 910
 911         /* Enable Rx and Tx in MACCFG1 */
 912         tempval = gfar_read(&regs->maccfg1);
 913         tempval |= (MACCFG1_RX_EN | MACCFG1_TX_EN);
 914         gfar_write(&regs->maccfg1, tempval);
 915
 916         /* Initialize DMACTRL to have WWR and WOP */
 917         tempval = gfar_read(&priv->regs->dmactrl);
 918         tempval |= DMACTRL_INIT_SETTINGS;
 919         gfar_write(&priv->regs->dmactrl, tempval);
 920
 921         /* Make sure we aren't stopped */
 922         tempval = gfar_read(&priv->regs->dmactrl);
 923         tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
 924         gfar_write(&priv->regs->dmactrl, tempval);
 925
 926         /* Clear THLT/RHLT, so that the DMA starts polling now */
 927         gfar_write(&regs->tstat, TSTAT_CLEAR_THALT);
 928         gfar_write(&regs->rstat, RSTAT_CLEAR_RHALT);
 929
 930         /* Unmask the interrupts we look for */
 931         gfar_write(&regs->imask, IMASK_DEFAULT);
 932
 933         dev->trans_start = jiffies;
 934 }
 935
 936 /* Bring the controller up and running */
 937 int startup_gfar(struct net_device *dev)
 938 {
 939         struct txbd8 *txbdp;
 940         struct rxbd8 *rxbdp;
 941         dma_addr_t addr = 0;
 942         unsigned long vaddr;
 943         int i;
 944         struct gfar_private *priv = netdev_priv(dev);
 945         struct gfar __iomem *regs = priv->regs;
 946         int err = 0;
 947         u32 rctrl = 0;
 948         u32 attrs = 0;
 949
 950         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 951
 952         /* Allocate memory for the buffer descriptors */
 953         vaddr = (unsigned long) dma_alloc_coherent(&dev->dev,
 954                         sizeof (struct txbd8) * priv->tx_ring_size +
 955                         sizeof (struct rxbd8) * priv->rx_ring_size,
 956                         &addr, GFP_KERNEL);
 957
 958         if (vaddr == 0) {
 959                 if (netif_msg_ifup(priv))
 960                         printk(KERN_ERR "%s: Could not allocate buffer descriptors!\n",
 961                                         dev->name);
 962                 return -ENOMEM;
 963         }
 964
 965         priv->tx_bd_base = (struct txbd8 *) vaddr;
 966
 967         /* enet DMA only understands physical addresses */
 968         gfar_write(&regs->tbase0, addr);
 969
 970         /* Start the rx descriptor ring where the tx ring leaves off */
 971         addr = addr + sizeof (struct txbd8) * priv->tx_ring_size;
 972         vaddr = vaddr + sizeof (struct txbd8) * priv->tx_ring_size;
 973         priv->rx_bd_base = (struct rxbd8 *) vaddr;
 974         gfar_write(&regs->rbase0, addr);
 975
 976         /* Setup the skbuff rings */
 977         priv->tx_skbuff =
 978             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 979                                         priv->tx_ring_size, GFP_KERNEL);
 980
 981         if (NULL == priv->tx_skbuff) {
 982                 if (netif_msg_ifup(priv))
 983                         printk(KERN_ERR "%s: Could not allocate tx_skbuff\n",
 984                                         dev->name);
 985                 err = -ENOMEM;
 986                 goto tx_skb_fail;
 987         }
 988
 989         for (i = 0; i < priv->tx_ring_size; i++)
 990                 priv->tx_skbuff[i] = NULL;
 991
 992         priv->rx_skbuff =
 993             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 994                                         priv->rx_ring_size, GFP_KERNEL);
 995
 996         if (NULL == priv->rx_skbuff) {
 997                 if (netif_msg_ifup(priv))
 998                         printk(KERN_ERR "%s: Could not allocate rx_skbuff\n",
 999                                         dev->name);
1000                 err = -ENOMEM;
1001                 goto rx_skb_fail;
1002         }
1003
1004         for (i = 0; i < priv->rx_ring_size; i++)
1005                 priv->rx_skbuff[i] = NULL;
1006
1007         /* Initialize some variables in our dev structure */
1008         priv->num_txbdfree = priv->tx_ring_size;
1009         priv->dirty_tx = priv->cur_tx = priv->tx_bd_base;
1010         priv->cur_rx = priv->rx_bd_base;
1011         priv->skb_curtx = priv->skb_dirtytx = 0;
1012         priv->skb_currx = 0;
1013
1014         /* Initialize Transmit Descriptor Ring */
1015         txbdp = priv->tx_bd_base;
1016         for (i = 0; i < priv->tx_ring_size; i++) {
1017                 txbdp->lstatus = 0;
1018                 txbdp->bufPtr = 0;
1019                 txbdp++;
1020         }
1021
1022         /* Set the last descriptor in the ring to indicate wrap */
1023         txbdp--;
1024         txbdp->status |= TXBD_WRAP;
1025
1026         rxbdp = priv->rx_bd_base;
1027         for (i = 0; i < priv->rx_ring_size; i++) {
1028                 struct sk_buff *skb;
1029
1030                 skb = gfar_new_skb(dev);
1031
1032                 if (!skb) {
1033                         printk(KERN_ERR "%s: Can't allocate RX buffers\n",
1034                                         dev->name);
1035
1036                         goto err_rxalloc_fail;
1037                 }
1038
1039                 priv->rx_skbuff[i] = skb;
1040
1041                 gfar_new_rxbdp(dev, rxbdp, skb);
1042
1043                 rxbdp++;
1044         }
1045
1046         /* Set the last descriptor in the ring to wrap */
1047         rxbdp--;
1048         rxbdp->status |= RXBD_WRAP;
1049
1050         /* If the device has multiple interrupts, register for
1051          * them.  Otherwise, only register for the one */
1052         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
1053                 /* Install our interrupt handlers for Error,
1054                  * Transmit, and Receive */
1055                 if (request_irq(priv->interruptError, gfar_error,
1056                                 0, priv->int_name_er, dev) < 0) {
1057                         if (netif_msg_intr(priv))
1058                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1059                                         dev->name, priv->interruptError);
1060
1061                         err = -1;
1062                         goto err_irq_fail;
1063                 }
1064
1065                 if (request_irq(priv->interruptTransmit, gfar_transmit,
1066                                 0, priv->int_name_tx, dev) < 0) {
1067                         if (netif_msg_intr(priv))
1068                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1069                                         dev->name, priv->interruptTransmit);
1070
1071                         err = -1;
1072
1073                         goto tx_irq_fail;
1074                 }
1075
1076                 if (request_irq(priv->interruptReceive, gfar_receive,
1077                                 0, priv->int_name_rx, dev) < 0) {
1078                         if (netif_msg_intr(priv))
1079                                 printk(KERN_ERR "%s: Can't get IRQ %d (receive0)\n",
1080                                                 dev->name, priv->interruptReceive);
1081
1082                         err = -1;
1083                         goto rx_irq_fail;
1084                 }
1085         } else {
1086                 if (request_irq(priv->interruptTransmit, gfar_interrupt,
1087                                 0, priv->int_name_tx, dev) < 0) {
1088                         if (netif_msg_intr(priv))
1089                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1090                                         dev->name, priv->interruptTransmit);
1091
1092                         err = -1;
1093                         goto err_irq_fail;
1094                 }
1095         }
1096
1097         phy_start(priv->phydev);
1098
1099         /* Configure the coalescing support */
1100         gfar_write(&regs->txic, 0);
1101         if (priv->txcoalescing)
1102                 gfar_write(&regs->txic, priv->txic);
1103
1104         gfar_write(&regs->rxic, 0);
1105         if (priv->rxcoalescing)
1106                 gfar_write(&regs->rxic, priv->rxic);
1107
1108         if (priv->rx_csum_enable)
1109                 rctrl |= RCTRL_CHECKSUMMING;
1110
1111         if (priv->extended_hash) {
1112                 rctrl |= RCTRL_EXTHASH;
1113
1114                 gfar_clear_exact_match(dev);
1115                 rctrl |= RCTRL_EMEN;
1116         }
1117
1118         if (priv->padding) {
1119                 rctrl &= ~RCTRL_PAL_MASK;
1120                 rctrl |= RCTRL_PADDING(priv->padding);
1121         }
1122
1123         /* Init rctrl based on our settings */
1124         gfar_write(&priv->regs->rctrl, rctrl);
1125
1126         if (dev->features & NETIF_F_IP_CSUM)
1127                 gfar_write(&priv->regs->tctrl, TCTRL_INIT_CSUM);
1128
1129         /* Set the extraction length and index */
1130         attrs = ATTRELI_EL(priv->rx_stash_size) |
1131                 ATTRELI_EI(priv->rx_stash_index);
1132
1133         gfar_write(&priv->regs->attreli, attrs);
1134
1135         /* Start with defaults, and add stashing or locking
1136          * depending on the approprate variables */
1137         attrs = ATTR_INIT_SETTINGS;
1138
1139         if (priv->bd_stash_en)
1140                 attrs |= ATTR_BDSTASH;
1141
1142         if (priv->rx_stash_size != 0)
1143                 attrs |= ATTR_BUFSTASH;
1144
1145         gfar_write(&priv->regs->attr, attrs);
1146
1147         gfar_write(&priv->regs->fifo_tx_thr, priv->fifo_threshold);
1148         gfar_write(&priv->regs->fifo_tx_starve, priv->fifo_starve);
1149         gfar_write(&priv->regs->fifo_tx_starve_shutoff, priv->fifo_starve_off);
1150
1151         /* Start the controller */
1152         gfar_start(dev);
1153
1154         return 0;
1155
1156 rx_irq_fail:
1157         free_irq(priv->interruptTransmit, dev);
1158 tx_irq_fail:
1159         free_irq(priv->interruptError, dev);
1160 err_irq_fail:
1161 err_rxalloc_fail:
1162 rx_skb_fail:
1163         free_skb_resources(priv);
1164 tx_skb_fail:
1165         dma_free_coherent(&dev->dev,
1166                         sizeof(struct txbd8)*priv->tx_ring_size
1167                         + sizeof(struct rxbd8)*priv->rx_ring_size,
1168                         priv->tx_bd_base,
1169                         gfar_read(&regs->tbase0));
1170
1171         return err;
1172 }
1173
1174 /* Called when something needs to use the ethernet device */
1175 /* Returns 0 for success. */
1176 static int gfar_enet_open(struct net_device *dev)
1177 {
1178         struct gfar_private *priv = netdev_priv(dev);
1179         int err;
1180
1181         napi_enable(&priv->napi);
1182
1183         /* Initialize a bunch of registers */
1184         init_registers(dev);
1185
1186         gfar_set_mac_address(dev);
1187
1188         err = init_phy(dev);
1189
1190         if(err) {
1191                 napi_disable(&priv->napi);
1192                 return err;
1193         }
1194
1195         err = startup_gfar(dev);
1196         if (err) {
1197                 napi_disable(&priv->napi);
1198                 return err;
1199         }
1200
1201         netif_start_queue(dev);
1202
1203         return err;
1204 }
1205
1206 static inline struct txfcb *gfar_add_fcb(struct sk_buff *skb)
1207 {
1208         struct txfcb *fcb = (struct txfcb *)skb_push (skb, GMAC_FCB_LEN);
1209
1210         cacheable_memzero(fcb, GMAC_FCB_LEN);
1211
1212         return fcb;
1213 }
1214
1215 static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
1216 {
1217         u8 flags = 0;
1218
1219         /* If we're here, it's a IP packet with a TCP or UDP
1220          * payload.  We set it to checksum, using a pseudo-header
1221          * we provide
1222          */
1223         flags = TXFCB_DEFAULT;
1224
1225         /* Tell the controller what the protocol is */
1226         /* And provide the already calculated phcs */
1227         if (ip_hdr(skb)->protocol == IPPROTO_UDP) {
1228                 flags |= TXFCB_UDP;
1229                 fcb->phcs = udp_hdr(skb)->check;
1230         } else
1231                 fcb->phcs = tcp_hdr(skb)->check;
1232
1233         /* l3os is the distance between the start of the
1234          * frame (skb->data) and the start of the IP hdr.
1235          * l4os is the distance between the start of the
1236          * l3 hdr and the l4 hdr */
1237         fcb->l3os = (u16)(skb_network_offset(skb) - GMAC_FCB_LEN);
1238         fcb->l4os = skb_network_header_len(skb);
1239
1240         fcb->flags = flags;
1241 }
1242
1243 void inline gfar_tx_vlan(struct sk_buff *skb, struct txfcb *fcb)
1244 {
1245         fcb->flags |= TXFCB_VLN;
1246         fcb->vlctl = vlan_tx_tag_get(skb);
1247 }
1248
1249 static inline struct txbd8 *skip_txbd(struct txbd8 *bdp, int stride,
1250                                struct txbd8 *base, int ring_size)
1251 {
1252         struct txbd8 *new_bd = bdp + stride;
1253
1254         return (new_bd >= (base + ring_size)) ? (new_bd - ring_size) : new_bd;
1255 }
1256
1257 static inline struct txbd8 *next_txbd(struct txbd8 *bdp, struct txbd8 *base,
1258                 int ring_size)
1259 {
1260         return skip_txbd(bdp, 1, base, ring_size);
1261 }
1262
1263 /* This is called by the kernel when a frame is ready for transmission. */
1264 /* It is pointed to by the dev->hard_start_xmit function pointer */
1265 static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
1266 {
1267         struct gfar_private *priv = netdev_priv(dev);
1268         struct txfcb *fcb = NULL;
1269         struct txbd8 *txbdp, *txbdp_start, *base;
1270         u32 lstatus;
1271         int i;
1272         u32 bufaddr;
1273         unsigned long flags;
1274         unsigned int nr_frags, length;
1275
1276         base = priv->tx_bd_base;
1277
1278         /* total number of fragments in the SKB */
1279         nr_frags = skb_shinfo(skb)->nr_frags;
1280
1281         spin_lock_irqsave(&priv->txlock, flags);
1282
1283         /* check if there is space to queue this packet */
1284         if (nr_frags > priv->num_txbdfree) {
1285                 /* no space, stop the queue */
1286                 netif_stop_queue(dev);
1287                 dev->stats.tx_fifo_errors++;
1288                 spin_unlock_irqrestore(&priv->txlock, flags);
1289                 return NETDEV_TX_BUSY;
1290         }
1291
1292         /* Update transmit stats */
1293         dev->stats.tx_bytes += skb->len;
1294
1295         txbdp = txbdp_start = priv->cur_tx;
1296
1297         if (nr_frags == 0) {
1298                 lstatus = txbdp->lstatus | BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
1299         } else {
1300                 /* Place the fragment addresses and lengths into the TxBDs */
1301                 for (i = 0; i < nr_frags; i++) {
1302                         /* Point at the next BD, wrapping as needed */
1303                         txbdp = next_txbd(txbdp, base, priv->tx_ring_size);
1304
1305                         length = skb_shinfo(skb)->frags[i].size;
1306
1307                         lstatus = txbdp->lstatus | length |
1308                                 BD_LFLAG(TXBD_READY);
1309
1310                         /* Handle the last BD specially */
1311                         if (i == nr_frags - 1)
1312                                 lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
1313
1314                         bufaddr = dma_map_page(&dev->dev,
1315                                         skb_shinfo(skb)->frags[i].page,
1316                                         skb_shinfo(skb)->frags[i].page_offset,
1317                                         length,
1318                                         DMA_TO_DEVICE);
1319
1320                         /* set the TxBD length and buffer pointer */
1321                         txbdp->bufPtr = bufaddr;
1322                         txbdp->lstatus = lstatus;
1323                 }
1324
1325                 lstatus = txbdp_start->lstatus;
1326         }
1327
1328         /* Set up checksumming */
1329         if (CHECKSUM_PARTIAL == skb->ip_summed) {
1330                 fcb = gfar_add_fcb(skb);
1331                 lstatus |= BD_LFLAG(TXBD_TOE);
1332                 gfar_tx_checksum(skb, fcb);
1333         }
1334
1335         if (priv->vlgrp && vlan_tx_tag_present(skb)) {
1336                 if (unlikely(NULL == fcb)) {
1337                         fcb = gfar_add_fcb(skb);
1338                         lstatus |= BD_LFLAG(TXBD_TOE);
1339                 }
1340
1341                 gfar_tx_vlan(skb, fcb);
1342         }
1343
1344         /* setup the TxBD length and buffer pointer for the first BD */
1345         priv->tx_skbuff[priv->skb_curtx] = skb;
1346         txbdp_start->bufPtr = dma_map_single(&dev->dev, skb->data,
1347                         skb_headlen(skb), DMA_TO_DEVICE);
1348
1349         lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
1350
1351         /*
1352          * The powerpc-specific eieio() is used, as wmb() has too strong
1353          * semantics (it requires synchronization between cacheable and
1354          * uncacheable mappings, which eieio doesn't provide and which we
1355          * don't need), thus requiring a more expensive sync instruction.  At
1356          * some point, the set of architecture-independent barrier functions
1357          * should be expanded to include weaker barriers.
1358          */
1359         eieio();
1360
1361         txbdp_start->lstatus = lstatus;
1362
1363         /* Update the current skb pointer to the next entry we will use
1364          * (wrapping if necessary) */
1365         priv->skb_curtx = (priv->skb_curtx + 1) &
1366                 TX_RING_MOD_MASK(priv->tx_ring_size);
1367
1368         priv->cur_tx = next_txbd(txbdp, base, priv->tx_ring_size);
1369
1370         /* reduce TxBD free count */
1371         priv->num_txbdfree -= (nr_frags + 1);
1372
1373         dev->trans_start = jiffies;
1374
1375         /* If the next BD still needs to be cleaned up, then the bds
1376            are full.  We need to tell the kernel to stop sending us stuff. */
1377         if (!priv->num_txbdfree) {
1378                 netif_stop_queue(dev);
1379
1380                 dev->stats.tx_fifo_errors++;
1381         }
1382
1383         /* Tell the DMA to go go go */
1384         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
1385
1386         /* Unlock priv */
1387         spin_unlock_irqrestore(&priv->txlock, flags);
1388
1389         return 0;
1390 }
1391
1392 /* Stops the kernel queue, and halts the controller */
1393 static int gfar_close(struct net_device *dev)
1394 {
1395         struct gfar_private *priv = netdev_priv(dev);
1396
1397         napi_disable(&priv->napi);
1398
1399         cancel_work_sync(&priv->reset_task);
1400         stop_gfar(dev);
1401
1402         /* Disconnect from the PHY */
1403         phy_disconnect(priv->phydev);
1404         priv->phydev = NULL;
1405
1406         netif_stop_queue(dev);
1407
1408         return 0;
1409 }
1410
1411 /* Changes the mac address if the controller is not running. */
1412 static int gfar_set_mac_address(struct net_device *dev)
1413 {
1414         gfar_set_mac_for_addr(dev, 0, dev->dev_addr);
1415
1416         return 0;
1417 }
1418
1419
1420 /* Enables and disables VLAN insertion/extraction */
1421 static void gfar_vlan_rx_register(struct net_device *dev,
1422                 struct vlan_group *grp)
1423 {
1424         struct gfar_private *priv = netdev_priv(dev);
1425         unsigned long flags;
1426         struct vlan_group *old_grp;
1427         u32 tempval;
1428
1429         spin_lock_irqsave(&priv->rxlock, flags);
1430
1431         old_grp = priv->vlgrp;
1432
1433         if (old_grp == grp)
1434                 return;
1435
1436         if (grp) {
1437                 /* Enable VLAN tag insertion */
1438                 tempval = gfar_read(&priv->regs->tctrl);
1439                 tempval |= TCTRL_VLINS;
1440
1441                 gfar_write(&priv->regs->tctrl, tempval);
1442
1443                 /* Enable VLAN tag extraction */
1444                 tempval = gfar_read(&priv->regs->rctrl);
1445                 tempval |= RCTRL_VLEX;
1446                 tempval |= (RCTRL_VLEX | RCTRL_PRSDEP_INIT);
1447                 gfar_write(&priv->regs->rctrl, tempval);
1448         } else {
1449                 /* Disable VLAN tag insertion */
1450                 tempval = gfar_read(&priv->regs->tctrl);
1451                 tempval &= ~TCTRL_VLINS;
1452                 gfar_write(&priv->regs->tctrl, tempval);
1453
1454                 /* Disable VLAN tag extraction */
1455                 tempval = gfar_read(&priv->regs->rctrl);
1456                 tempval &= ~RCTRL_VLEX;
1457                 /* If parse is no longer required, then disable parser */
1458                 if (tempval & RCTRL_REQ_PARSER)
1459                         tempval |= RCTRL_PRSDEP_INIT;
1460                 else
1461                         tempval &= ~RCTRL_PRSDEP_INIT;
1462                 gfar_write(&priv->regs->rctrl, tempval);
1463         }
1464
1465         gfar_change_mtu(dev, dev->mtu);
1466
1467         spin_unlock_irqrestore(&priv->rxlock, flags);
1468 }
1469
1470 static int gfar_change_mtu(struct net_device *dev, int new_mtu)
1471 {
1472         int tempsize, tempval;
1473         struct gfar_private *priv = netdev_priv(dev);
1474         int oldsize = priv->rx_buffer_size;
1475         int frame_size = new_mtu + ETH_HLEN;
1476
1477         if (priv->vlgrp)
1478                 frame_size += VLAN_HLEN;
1479
1480         if ((frame_size < 64) || (frame_size > JUMBO_FRAME_SIZE)) {
1481                 if (netif_msg_drv(priv))
1482                         printk(KERN_ERR "%s: Invalid MTU setting\n",
1483                                         dev->name);
1484                 return -EINVAL;
1485         }
1486
1487         if (gfar_uses_fcb(priv))
1488                 frame_size += GMAC_FCB_LEN;
1489
1490         frame_size += priv->padding;
1491
1492         tempsize =
1493             (frame_size & ~(INCREMENTAL_BUFFER_SIZE - 1)) +
1494             INCREMENTAL_BUFFER_SIZE;
1495
1496         /* Only stop and start the controller if it isn't already
1497          * stopped, and we changed something */
1498         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1499                 stop_gfar(dev);
1500
1501         priv->rx_buffer_size = tempsize;
1502
1503         dev->mtu = new_mtu;
1504
1505         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
1506         gfar_write(&priv->regs->maxfrm, priv->rx_buffer_size);
1507
1508         /* If the mtu is larger than the max size for standard
1509          * ethernet frames (ie, a jumbo frame), then set maccfg2
1510          * to allow huge frames, and to check the length */
1511         tempval = gfar_read(&priv->regs->maccfg2);
1512
1513         if (priv->rx_buffer_size > DEFAULT_RX_BUFFER_SIZE)
1514                 tempval |= (MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1515         else
1516                 tempval &= ~(MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1517
1518         gfar_write(&priv->regs->maccfg2, tempval);
1519
1520         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1521                 startup_gfar(dev);
1522
1523         return 0;
1524 }
1525
1526 /* gfar_reset_task gets scheduled when a packet has not been
1527  * transmitted after a set amount of time.
1528  * For now, assume that clearing out all the structures, and
1529  * starting over will fix the problem.
1530  */
1531 static void gfar_reset_task(struct work_struct *work)
1532 {
1533         struct gfar_private *priv = container_of(work, struct gfar_private,
1534                         reset_task);
1535         struct net_device *dev = priv->dev;
1536
1537         if (dev->flags & IFF_UP) {
1538                 stop_gfar(dev);
1539                 startup_gfar(dev);
1540         }
1541
1542         netif_tx_schedule_all(dev);
1543 }
1544
1545 static void gfar_timeout(struct net_device *dev)
1546 {
1547         struct gfar_private *priv = netdev_priv(dev);
1548
1549         dev->stats.tx_errors++;
1550         schedule_work(&priv->reset_task);
1551 }
1552
1553 /* Interrupt Handler for Transmit complete */
1554 static int gfar_clean_tx_ring(struct net_device *dev)
1555 {
1556         struct gfar_private *priv = netdev_priv(dev);
1557         struct txbd8 *bdp;
1558         struct txbd8 *lbdp = NULL;
1559         struct txbd8 *base = priv->tx_bd_base;
1560         struct sk_buff *skb;
1561         int skb_dirtytx;
1562         int tx_ring_size = priv->tx_ring_size;
1563         int frags = 0;
1564         int i;
1565         int howmany = 0;
1566         u32 lstatus;
1567
1568         bdp = priv->dirty_tx;
1569         skb_dirtytx = priv->skb_dirtytx;
1570
1571         while ((skb = priv->tx_skbuff[skb_dirtytx])) {
1572                 frags = skb_shinfo(skb)->nr_frags;
1573                 lbdp = skip_txbd(bdp, frags, base, tx_ring_size);
1574
1575                 lstatus = lbdp->lstatus;
1576
1577                 /* Only clean completed frames */
1578                 if ((lstatus & BD_LFLAG(TXBD_READY)) &&
1579                                 (lstatus & BD_LENGTH_MASK))
1580                         break;
1581
1582                 dma_unmap_single(&dev->dev,
1583                                 bdp->bufPtr,
1584                                 bdp->length,
1585                                 DMA_TO_DEVICE);
1586
1587                 bdp->lstatus &= BD_LFLAG(TXBD_WRAP);
1588                 bdp = next_txbd(bdp, base, tx_ring_size);
1589
1590                 for (i = 0; i < frags; i++) {
1591                         dma_unmap_page(&dev->dev,
1592                                         bdp->bufPtr,
1593                                         bdp->length,
1594                                         DMA_TO_DEVICE);
1595                         bdp->lstatus &= BD_LFLAG(TXBD_WRAP);
1596                         bdp = next_txbd(bdp, base, tx_ring_size);
1597                 }
1598
1599                 dev_kfree_skb_any(skb);
1600                 priv->tx_skbuff[skb_dirtytx] = NULL;
1601
1602                 skb_dirtytx = (skb_dirtytx + 1) &
1603                         TX_RING_MOD_MASK(tx_ring_size);
1604
1605                 howmany++;
1606                 priv->num_txbdfree += frags + 1;
1607         }
1608
1609         /* If we freed a buffer, we can restart transmission, if necessary */
1610         if (netif_queue_stopped(dev) && priv->num_txbdfree)
1611                 netif_wake_queue(dev);
1612
1613         /* Update dirty indicators */
1614         priv->skb_dirtytx = skb_dirtytx;
1615         priv->dirty_tx = bdp;
1616
1617         dev->stats.tx_packets += howmany;
1618
1619         return howmany;
1620 }
1621
1622 static void gfar_schedule_cleanup(struct net_device *dev)
1623 {
1624         struct gfar_private *priv = netdev_priv(dev);
1625         if (netif_rx_schedule_prep(&priv->napi)) {
1626                 gfar_write(&priv->regs->imask, IMASK_RTX_DISABLED);
1627                 __netif_rx_schedule(&priv->napi);
1628         }
1629 }
1630
1631 /* Interrupt Handler for Transmit complete */
1632 static irqreturn_t gfar_transmit(int irq, void *dev_id)
1633 {
1634         gfar_schedule_cleanup((struct net_device *)dev_id);
1635         return IRQ_HANDLED;
1636 }
1637
1638 static void gfar_new_rxbdp(struct net_device *dev, struct rxbd8 *bdp,
1639                 struct sk_buff *skb)
1640 {
1641         struct gfar_private *priv = netdev_priv(dev);
1642         u32 lstatus;
1643
1644         bdp->bufPtr = dma_map_single(&dev->dev, skb->data,
1645                         priv->rx_buffer_size, DMA_FROM_DEVICE);
1646
1647         lstatus = BD_LFLAG(RXBD_EMPTY | RXBD_INTERRUPT);
1648
1649         if (bdp == priv->rx_bd_base + priv->rx_ring_size - 1)
1650                 lstatus |= BD_LFLAG(RXBD_WRAP);
1651
1652         eieio();
1653
1654         bdp->lstatus = lstatus;
1655 }
1656
1657
1658 struct sk_buff * gfar_new_skb(struct net_device *dev)
1659 {
1660         unsigned int alignamount;
1661         struct gfar_private *priv = netdev_priv(dev);
1662         struct sk_buff *skb = NULL;
1663
1664         /* We have to allocate the skb, so keep trying till we succeed */
1665         skb = netdev_alloc_skb(dev, priv->rx_buffer_size + RXBUF_ALIGNMENT);
1666
1667         if (!skb)
1668                 return NULL;
1669
1670         alignamount = RXBUF_ALIGNMENT -
1671                 (((unsigned long) skb->data) & (RXBUF_ALIGNMENT - 1));
1672
1673         /* We need the data buffer to be aligned properly.  We will reserve
1674          * as many bytes as needed to align the data properly
1675          */
1676         skb_reserve(skb, alignamount);
1677
1678         return skb;
1679 }
1680
1681 static inline void count_errors(unsigned short status, struct net_device *dev)
1682 {
1683         struct gfar_private *priv = netdev_priv(dev);
1684         struct net_device_stats *stats = &dev->stats;
1685         struct gfar_extra_stats *estats = &priv->extra_stats;
1686
1687         /* If the packet was truncated, none of the other errors
1688          * matter */
1689         if (status & RXBD_TRUNCATED) {
1690                 stats->rx_length_errors++;
1691
1692                 estats->rx_trunc++;
1693
1694                 return;
1695         }
1696         /* Count the errors, if there were any */
1697         if (status & (RXBD_LARGE | RXBD_SHORT)) {
1698                 stats->rx_length_errors++;
1699
1700                 if (status & RXBD_LARGE)
1701                         estats->rx_large++;
1702                 else
1703                         estats->rx_short++;
1704         }
1705         if (status & RXBD_NONOCTET) {
1706                 stats->rx_frame_errors++;
1707                 estats->rx_nonoctet++;
1708         }
1709         if (status & RXBD_CRCERR) {
1710                 estats->rx_crcerr++;
1711                 stats->rx_crc_errors++;
1712         }
1713         if (status & RXBD_OVERRUN) {
1714                 estats->rx_overrun++;
1715                 stats->rx_crc_errors++;
1716         }
1717 }
1718
1719 irqreturn_t gfar_receive(int irq, void *dev_id)
1720 {
1721         gfar_schedule_cleanup((struct net_device *)dev_id);
1722         return IRQ_HANDLED;
1723 }
1724
1725 static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
1726 {
1727         /* If valid headers were found, and valid sums
1728          * were verified, then we tell the kernel that no
1729          * checksumming is necessary.  Otherwise, it is */
1730         if ((fcb->flags & RXFCB_CSUM_MASK) == (RXFCB_CIP | RXFCB_CTU))
1731                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1732         else
1733                 skb->ip_summed = CHECKSUM_NONE;
1734 }
1735
1736
1737 /* gfar_process_frame() -- handle one incoming packet if skb
1738  * isn't NULL.  */
1739 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
1740                               int amount_pull)
1741 {
1742         struct gfar_private *priv = netdev_priv(dev);
1743         struct rxfcb *fcb = NULL;
1744
1745         int ret;
1746
1747         /* fcb is at the beginning if exists */
1748         fcb = (struct rxfcb *)skb->data;
1749
1750         /* Remove the FCB from the skb */
1751         /* Remove the padded bytes, if there are any */
1752         if (amount_pull)
1753                 skb_pull(skb, amount_pull);
1754
1755         if (priv->rx_csum_enable)
1756                 gfar_rx_checksum(skb, fcb);
1757
1758         /* Tell the skb what kind of packet this is */
1759         skb->protocol = eth_type_trans(skb, dev);
1760
1761         /* Send the packet up the stack */
1762         if (unlikely(priv->vlgrp && (fcb->flags & RXFCB_VLN)))
1763                 ret = vlan_hwaccel_receive_skb(skb, priv->vlgrp, fcb->vlctl);
1764         else
1765                 ret = netif_receive_skb(skb);
1766
1767         if (NET_RX_DROP == ret)
1768                 priv->extra_stats.kernel_dropped++;
1769
1770         return 0;
1771 }
1772
1773 /* gfar_clean_rx_ring() -- Processes each frame in the rx ring
1774  *   until the budget/quota has been reached. Returns the number
1775  *   of frames handled
1776  */
1777 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
1778 {
1779         struct rxbd8 *bdp, *base;
1780         struct sk_buff *skb;
1781         int pkt_len;
1782         int amount_pull;
1783         int howmany = 0;
1784         struct gfar_private *priv = netdev_priv(dev);
1785
1786         /* Get the first full descriptor */
1787         bdp = priv->cur_rx;
1788         base = priv->rx_bd_base;
1789
1790         amount_pull = (gfar_uses_fcb(priv) ? GMAC_FCB_LEN : 0) +
1791                 priv->padding;
1792
1793         while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
1794                 struct sk_buff *newskb;
1795                 rmb();
1796
1797                 /* Add another skb for the future */
1798                 newskb = gfar_new_skb(dev);
1799
1800                 skb = priv->rx_skbuff[priv->skb_currx];
1801
1802                 dma_unmap_single(&priv->dev->dev, bdp->bufPtr,
1803                                 priv->rx_buffer_size, DMA_FROM_DEVICE);
1804
1805                 /* We drop the frame if we failed to allocate a new buffer */
1806                 if (unlikely(!newskb || !(bdp->status & RXBD_LAST) ||
1807                                  bdp->status & RXBD_ERR)) {
1808                         count_errors(bdp->status, dev);
1809
1810                         if (unlikely(!newskb))
1811                                 newskb = skb;
1812                         else if (skb)
1813                                 dev_kfree_skb_any(skb);
1814                 } else {
1815                         /* Increment the number of packets */
1816                         dev->stats.rx_packets++;
1817                         howmany++;
1818
1819                         if (likely(skb)) {
1820                                 pkt_len = bdp->length - ETH_FCS_LEN;
1821                                 /* Remove the FCS from the packet length */
1822                                 skb_put(skb, pkt_len);
1823                                 dev->stats.rx_bytes += pkt_len;
1824
1825                                 gfar_process_frame(dev, skb, amount_pull);
1826
1827                         } else {
1828                                 if (netif_msg_rx_err(priv))
1829                                         printk(KERN_WARNING
1830                                                "%s: Missing skb!\n", dev->name);
1831                                 dev->stats.rx_dropped++;
1832                                 priv->extra_stats.rx_skbmissing++;
1833                         }
1834
1835                 }
1836
1837                 priv->rx_skbuff[priv->skb_currx] = newskb;
1838
1839                 /* Setup the new bdp */
1840                 gfar_new_rxbdp(dev, bdp, newskb);
1841
1842                 /* Update to the next pointer */
1843                 bdp = next_bd(bdp, base, priv->rx_ring_size);
1844
1845                 /* update to point at the next skb */
1846                 priv->skb_currx =
1847                     (priv->skb_currx + 1) &
1848                     RX_RING_MOD_MASK(priv->rx_ring_size);
1849         }
1850
1851         /* Update the current rxbd pointer to be the next one */
1852         priv->cur_rx = bdp;
1853
1854         return howmany;
1855 }
1856
1857 static int gfar_poll(struct napi_struct *napi, int budget)
1858 {
1859         struct gfar_private *priv = container_of(napi, struct gfar_private, napi);
1860         struct net_device *dev = priv->dev;
1861         int tx_cleaned = 0;
1862         int rx_cleaned = 0;
1863         unsigned long flags;
1864
1865         /* Clear IEVENT, so interrupts aren't called again
1866          * because of the packets that have already arrived */
1867         gfar_write(&priv->regs->ievent, IEVENT_RTX_MASK);
1868
1869         /* If we fail to get the lock, don't bother with the TX BDs */
1870         if (spin_trylock_irqsave(&priv->txlock, flags)) {
1871                 tx_cleaned = gfar_clean_tx_ring(dev);
1872                 spin_unlock_irqrestore(&priv->txlock, flags);
1873         }
1874
1875         rx_cleaned = gfar_clean_rx_ring(dev, budget);
1876
1877         if (tx_cleaned)
1878                 return budget;
1879
1880         if (rx_cleaned < budget) {
1881                 netif_rx_complete(napi);
1882
1883                 /* Clear the halt bit in RSTAT */
1884                 gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
1885
1886                 gfar_write(&priv->regs->imask, IMASK_DEFAULT);
1887
1888                 /* If we are coalescing interrupts, update the timer */
1889                 /* Otherwise, clear it */
1890                 if (likely(priv->rxcoalescing)) {
1891                         gfar_write(&priv->regs->rxic, 0);
1892                         gfar_write(&priv->regs->rxic, priv->rxic);
1893                 }
1894                 if (likely(priv->txcoalescing)) {
1895                         gfar_write(&priv->regs->txic, 0);
1896                         gfar_write(&priv->regs->txic, priv->txic);
1897                 }
1898         }
1899
1900         return rx_cleaned;
1901 }
1902
1903 #ifdef CONFIG_NET_POLL_CONTROLLER
1904 /*
1905  * Polling 'interrupt' - used by things like netconsole to send skbs
1906  * without having to re-enable interrupts. It's not called while
1907  * the interrupt routine is executing.
1908  */
1909 static void gfar_netpoll(struct net_device *dev)
1910 {
1911         struct gfar_private *priv = netdev_priv(dev);
1912
1913         /* If the device has multiple interrupts, run tx/rx */
1914         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
1915                 disable_irq(priv->interruptTransmit);
1916                 disable_irq(priv->interruptReceive);
1917                 disable_irq(priv->interruptError);
1918                 gfar_interrupt(priv->interruptTransmit, dev);
1919                 enable_irq(priv->interruptError);
1920                 enable_irq(priv->interruptReceive);
1921                 enable_irq(priv->interruptTransmit);
1922         } else {
1923                 disable_irq(priv->interruptTransmit);
1924                 gfar_interrupt(priv->interruptTransmit, dev);
1925                 enable_irq(priv->interruptTransmit);
1926         }
1927 }
1928 #endif
1929
1930 /* The interrupt handler for devices with one interrupt */
1931 static irqreturn_t gfar_interrupt(int irq, void *dev_id)
1932 {
1933         struct net_device *dev = dev_id;
1934         struct gfar_private *priv = netdev_priv(dev);
1935
1936         /* Save ievent for future reference */
1937         u32 events = gfar_read(&priv->regs->ievent);
1938
1939         /* Check for reception */
1940         if (events & IEVENT_RX_MASK)
1941                 gfar_receive(irq, dev_id);
1942
1943         /* Check for transmit completion */
1944         if (events & IEVENT_TX_MASK)
1945                 gfar_transmit(irq, dev_id);
1946
1947         /* Check for errors */
1948         if (events & IEVENT_ERR_MASK)
1949                 gfar_error(irq, dev_id);
1950
1951         return IRQ_HANDLED;
1952 }
1953
1954 /* Called every time the controller might need to be made
1955  * aware of new link state.  The PHY code conveys this
1956  * information through variables in the phydev structure, and this
1957  * function converts those variables into the appropriate
1958  * register values, and can bring down the device if needed.
1959  */
1960 static void adjust_link(struct net_device *dev)
1961 {
1962         struct gfar_private *priv = netdev_priv(dev);
1963         struct gfar __iomem *regs = priv->regs;
1964         unsigned long flags;
1965         struct phy_device *phydev = priv->phydev;
1966         int new_state = 0;
1967
1968         spin_lock_irqsave(&priv->txlock, flags);
1969         if (phydev->link) {
1970                 u32 tempval = gfar_read(&regs->maccfg2);
1971                 u32 ecntrl = gfar_read(&regs->ecntrl);
1972
1973                 /* Now we make sure that we can be in full duplex mode.
1974                  * If not, we operate in half-duplex mode. */
1975                 if (phydev->duplex != priv->oldduplex) {
1976                         new_state = 1;
1977                         if (!(phydev->duplex))
1978                                 tempval &= ~(MACCFG2_FULL_DUPLEX);
1979                         else
1980                                 tempval |= MACCFG2_FULL_DUPLEX;
1981
1982                         priv->oldduplex = phydev->duplex;
1983                 }
1984
1985                 if (phydev->speed != priv->oldspeed) {
1986                         new_state = 1;
1987                         switch (phydev->speed) {
1988                         case 1000:
1989                                 tempval =
1990                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_GMII);
1991
1992                                 ecntrl &= ~(ECNTRL_R100);
1993                                 break;
1994                         case 100:
1995                         case 10:
1996                                 tempval =
1997                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_MII);
1998
1999                                 /* Reduced mode distinguishes
2000                                  * between 10 and 100 */
2001                                 if (phydev->speed == SPEED_100)
2002                                         ecntrl |= ECNTRL_R100;
2003                                 else
2004                                         ecntrl &= ~(ECNTRL_R100);
2005                                 break;
2006                         default:
2007                                 if (netif_msg_link(priv))
2008                                         printk(KERN_WARNING
2009                                                 "%s: Ack!  Speed (%d) is not 10/100/1000!\n",
2010                                                 dev->name, phydev->speed);
2011                                 break;
2012                         }
2013
2014                         priv->oldspeed = phydev->speed;
2015                 }
2016
2017                 gfar_write(&regs->maccfg2, tempval);
2018                 gfar_write(&regs->ecntrl, ecntrl);
2019
2020                 if (!priv->oldlink) {
2021                         new_state = 1;
2022                         priv->oldlink = 1;
2023                 }
2024         } else if (priv->oldlink) {
2025                 new_state = 1;
2026                 priv->oldlink = 0;
2027                 priv->oldspeed = 0;
2028                 priv->oldduplex = -1;
2029         }
2030
2031         if (new_state && netif_msg_link(priv))
2032                 phy_print_status(phydev);
2033
2034         spin_unlock_irqrestore(&priv->txlock, flags);
2035 }
2036
2037 /* Update the hash table based on the current list of multicast
2038  * addresses we subscribe to.  Also, change the promiscuity of
2039  * the device based on the flags (this function is called
2040  * whenever dev->flags is changed */
2041 static void gfar_set_multi(struct net_device *dev)
2042 {
2043         struct dev_mc_list *mc_ptr;
2044         struct gfar_private *priv = netdev_priv(dev);
2045         struct gfar __iomem *regs = priv->regs;
2046         u32 tempval;
2047
2048         if(dev->flags & IFF_PROMISC) {
2049                 /* Set RCTRL to PROM */
2050                 tempval = gfar_read(&regs->rctrl);
2051                 tempval |= RCTRL_PROM;
2052                 gfar_write(&regs->rctrl, tempval);
2053         } else {
2054                 /* Set RCTRL to not PROM */
2055                 tempval = gfar_read(&regs->rctrl);
2056                 tempval &= ~(RCTRL_PROM);
2057                 gfar_write(&regs->rctrl, tempval);
2058         }
2059
2060         if(dev->flags & IFF_ALLMULTI) {
2061                 /* Set the hash to rx all multicast frames */
2062                 gfar_write(&regs->igaddr0, 0xffffffff);
2063                 gfar_write(&regs->igaddr1, 0xffffffff);
2064                 gfar_write(&regs->igaddr2, 0xffffffff);
2065                 gfar_write(&regs->igaddr3, 0xffffffff);
2066                 gfar_write(&regs->igaddr4, 0xffffffff);
2067                 gfar_write(&regs->igaddr5, 0xffffffff);
2068                 gfar_write(&regs->igaddr6, 0xffffffff);
2069                 gfar_write(&regs->igaddr7, 0xffffffff);
2070                 gfar_write(&regs->gaddr0, 0xffffffff);
2071                 gfar_write(&regs->gaddr1, 0xffffffff);
2072                 gfar_write(&regs->gaddr2, 0xffffffff);
2073                 gfar_write(&regs->gaddr3, 0xffffffff);
2074                 gfar_write(&regs->gaddr4, 0xffffffff);
2075                 gfar_write(&regs->gaddr5, 0xffffffff);
2076                 gfar_write(&regs->gaddr6, 0xffffffff);
2077                 gfar_write(&regs->gaddr7, 0xffffffff);
2078         } else {
2079                 int em_num;
2080                 int idx;
2081
2082                 /* zero out the hash */
2083                 gfar_write(&regs->igaddr0, 0x0);
2084                 gfar_write(&regs->igaddr1, 0x0);
2085                 gfar_write(&regs->igaddr2, 0x0);
2086                 gfar_write(&regs->igaddr3, 0x0);
2087                 gfar_write(&regs->igaddr4, 0x0);
2088                 gfar_write(&regs->igaddr5, 0x0);
2089                 gfar_write(&regs->igaddr6, 0x0);
2090                 gfar_write(&regs->igaddr7, 0x0);
2091                 gfar_write(&regs->gaddr0, 0x0);
2092                 gfar_write(&regs->gaddr1, 0x0);
2093                 gfar_write(&regs->gaddr2, 0x0);
2094                 gfar_write(&regs->gaddr3, 0x0);
2095                 gfar_write(&regs->gaddr4, 0x0);
2096                 gfar_write(&regs->gaddr5, 0x0);
2097                 gfar_write(&regs->gaddr6, 0x0);
2098                 gfar_write(&regs->gaddr7, 0x0);
2099
2100                 /* If we have extended hash tables, we need to
2101                  * clear the exact match registers to prepare for
2102                  * setting them */
2103                 if (priv->extended_hash) {
2104                         em_num = GFAR_EM_NUM + 1;
2105                         gfar_clear_exact_match(dev);
2106                         idx = 1;
2107                 } else {
2108                         idx = 0;
2109                         em_num = 0;
2110                 }
2111
2112                 if(dev->mc_count == 0)
2113                         return;
2114
2115                 /* Parse the list, and set the appropriate bits */
2116                 for(mc_ptr = dev->mc_list; mc_ptr; mc_ptr = mc_ptr->next) {
2117                         if (idx < em_num) {
2118                                 gfar_set_mac_for_addr(dev, idx,
2119                                                 mc_ptr->dmi_addr);
2120                                 idx++;
2121                         } else
2122                                 gfar_set_hash_for_addr(dev, mc_ptr->dmi_addr);
2123                 }
2124         }
2125
2126         return;
2127 }
2128
2129
2130 /* Clears each of the exact match registers to zero, so they
2131  * don't interfere with normal reception */
2132 static void gfar_clear_exact_match(struct net_device *dev)
2133 {
2134         int idx;
2135         u8 zero_arr[MAC_ADDR_LEN] = {0,0,0,0,0,0};
2136
2137         for(idx = 1;idx < GFAR_EM_NUM + 1;idx++)
2138                 gfar_set_mac_for_addr(dev, idx, (u8 *)zero_arr);
2139 }
2140
2141 /* Set the appropriate hash bit for the given addr */
2142 /* The algorithm works like so:
2143  * 1) Take the Destination Address (ie the multicast address), and
2144  * do a CRC on it (little endian), and reverse the bits of the
2145  * result.
2146  * 2) Use the 8 most significant bits as a hash into a 256-entry
2147  * table.  The table is controlled through 8 32-bit registers:
2148  * gaddr0-7.  gaddr0's MSB is entry 0, and gaddr7's LSB is
2149  * gaddr7.  This means that the 3 most significant bits in the
2150  * hash index which gaddr register to use, and the 5 other bits
2151  * indicate which bit (assuming an IBM numbering scheme, which
2152  * for PowerPC (tm) is usually the case) in the register holds
2153  * the entry. */
2154 static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr)
2155 {
2156         u32 tempval;
2157         struct gfar_private *priv = netdev_priv(dev);
2158         u32 result = ether_crc(MAC_ADDR_LEN, addr);
2159         int width = priv->hash_width;
2160         u8 whichbit = (result >> (32 - width)) & 0x1f;
2161         u8 whichreg = result >> (32 - width + 5);
2162         u32 value = (1 << (31-whichbit));
2163
2164         tempval = gfar_read(priv->hash_regs[whichreg]);
2165         tempval |= value;
2166         gfar_write(priv->hash_regs[whichreg], tempval);
2167
2168         return;
2169 }
2170
2171
2172 /* There are multiple MAC Address register pairs on some controllers
2173  * This function sets the numth pair to a given address
2174  */
2175 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr)
2176 {
2177         struct gfar_private *priv = netdev_priv(dev);
2178         int idx;
2179         char tmpbuf[MAC_ADDR_LEN];
2180         u32 tempval;
2181         u32 __iomem *macptr = &priv->regs->macstnaddr1;
2182
2183         macptr += num*2;
2184
2185         /* Now copy it into the mac registers backwards, cuz */
2186         /* little endian is silly */
2187         for (idx = 0; idx < MAC_ADDR_LEN; idx++)
2188                 tmpbuf[MAC_ADDR_LEN - 1 - idx] = addr[idx];
2189
2190         gfar_write(macptr, *((u32 *) (tmpbuf)));
2191
2192         tempval = *((u32 *) (tmpbuf + 4));
2193
2194         gfar_write(macptr+1, tempval);
2195 }
2196
2197 /* GFAR error interrupt handler */
2198 static irqreturn_t gfar_error(int irq, void *dev_id)
2199 {
2200         struct net_device *dev = dev_id;
2201         struct gfar_private *priv = netdev_priv(dev);
2202
2203         /* Save ievent for future reference */
2204         u32 events = gfar_read(&priv->regs->ievent);
2205
2206         /* Clear IEVENT */
2207         gfar_write(&priv->regs->ievent, events & IEVENT_ERR_MASK);
2208
2209         /* Magic Packet is not an error. */
2210         if ((priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET) &&
2211             (events & IEVENT_MAG))
2212                 events &= ~IEVENT_MAG;
2213
2214         /* Hmm... */
2215         if (netif_msg_rx_err(priv) || netif_msg_tx_err(priv))
2216                 printk(KERN_DEBUG "%s: error interrupt (ievent=0x%08x imask=0x%08x)\n",
2217                        dev->name, events, gfar_read(&priv->regs->imask));
2218
2219         /* Update the error counters */
2220         if (events & IEVENT_TXE) {
2221                 dev->stats.tx_errors++;
2222
2223                 if (events & IEVENT_LC)
2224                         dev->stats.tx_window_errors++;
2225                 if (events & IEVENT_CRL)
2226                         dev->stats.tx_aborted_errors++;
2227                 if (events & IEVENT_XFUN) {
2228                         if (netif_msg_tx_err(priv))
2229                                 printk(KERN_DEBUG "%s: TX FIFO underrun, "
2230                                        "packet dropped.\n", dev->name);
2231                         dev->stats.tx_dropped++;
2232                         priv->extra_stats.tx_underrun++;
2233
2234                         /* Reactivate the Tx Queues */
2235                         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
2236                 }
2237                 if (netif_msg_tx_err(priv))
2238                         printk(KERN_DEBUG "%s: Transmit Error\n", dev->name);
2239         }
2240         if (events & IEVENT_BSY) {
2241                 dev->stats.rx_errors++;
2242                 priv->extra_stats.rx_bsy++;
2243
2244                 gfar_receive(irq, dev_id);
2245
2246                 if (netif_msg_rx_err(priv))
2247                         printk(KERN_DEBUG "%s: busy error (rstat: %x)\n",
2248                                dev->name, gfar_read(&priv->regs->rstat));
2249         }
2250         if (events & IEVENT_BABR) {
2251                 dev->stats.rx_errors++;
2252                 priv->extra_stats.rx_babr++;
2253
2254                 if (netif_msg_rx_err(priv))
2255                         printk(KERN_DEBUG "%s: babbling RX error\n", dev->name);
2256         }
2257         if (events & IEVENT_EBERR) {
2258                 priv->extra_stats.eberr++;
2259                 if (netif_msg_rx_err(priv))
2260                         printk(KERN_DEBUG "%s: bus error\n", dev->name);
2261         }
2262         if ((events & IEVENT_RXC) && netif_msg_rx_status(priv))
2263                 printk(KERN_DEBUG "%s: control frame\n", dev->name);
2264
2265         if (events & IEVENT_BABT) {
2266                 priv->extra_stats.tx_babt++;
2267                 if (netif_msg_tx_err(priv))
2268                         printk(KERN_DEBUG "%s: babbling TX error\n", dev->name);
2269         }
2270         return IRQ_HANDLED;
2271 }
2272
2273 /* work with hotplug and coldplug */
2274 MODULE_ALIAS("platform:fsl-gianfar");
2275
2276 static struct of_device_id gfar_match[] =
2277 {
2278         {
2279                 .type = "network",
2280                 .compatible = "gianfar",
2281         },
2282         {},
2283 };
2284
2285 /* Structure for a device driver */
2286 static struct of_platform_driver gfar_driver = {
2287         .name = "fsl-gianfar",
2288         .match_table = gfar_match,
2289
2290         .probe = gfar_probe,
2291         .remove = gfar_remove,
2292         .suspend = gfar_suspend,
2293         .resume = gfar_resume,
2294 };
2295
2296 static int __init gfar_init(void)
2297 {
2298         int err = gfar_mdio_init();
2299
2300         if (err)
2301                 return err;
2302
2303         err = of_register_platform_driver(&gfar_driver);
2304
2305         if (err)
2306                 gfar_mdio_exit();
2307
2308         return err;
2309 }
2310
2311 static void __exit gfar_exit(void)
2312 {
2313         of_unregister_platform_driver(&gfar_driver);
2314         gfar_mdio_exit();
2315 }
2316
2317 module_init(gfar_init);
2318 module_exit(gfar_exit);
2319