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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 platform_device.  Structures which
  29  *  define the configuration needed by the board are defined in a
  30  *  board structure in arch/ppc/platforms (though I do not
  31  *  discount the possibility that other architectures could one
  32  *  day be supported.
  33  *
  34  *  The Gianfar Ethernet Controller uses a ring of buffer
  35  *  descriptors.  The beginning is indicated by a register
  36  *  pointing to the physical address of the start of the ring.
  37  *  The end is determined by a "wrap" bit being set in the
  38  *  last descriptor of the ring.
  39  *
  40  *  When a packet is received, the RXF bit in the
  41  *  IEVENT register is set, triggering an interrupt when the
  42  *  corresponding bit in the IMASK register is also set (if
  43  *  interrupt coalescing is active, then the interrupt may not
  44  *  happen immediately, but will wait until either a set number
  45  *  of frames or amount of time have passed).  In NAPI, the
  46  *  interrupt handler will signal there is work to be done, and
  47  *  exit.  Without NAPI, the packet(s) will be handled
  48  *  immediately.  Both methods will start at the last known empty
  49  *  descriptor, and process every subsequent descriptor until there
  50  *  are none left with data (NAPI will stop after a set number of
  51  *  packets to give time to other tasks, but will eventually
  52  *  process all the packets).  The data arrives inside a
  53  *  pre-allocated skb, and so after the skb is passed up to the
  54  *  stack, a new skb must be allocated, and the address field in
  55  *  the buffer descriptor must be updated to indicate this new
  56  *  skb.
  57  *
  58  *  When the kernel requests that a packet be transmitted, the
  59  *  driver starts where it left off last time, and points the
  60  *  descriptor at the buffer which was passed in.  The driver
  61  *  then informs the DMA engine that there are packets ready to
  62  *  be transmitted.  Once the controller is finished transmitting
  63  *  the packet, an interrupt may be triggered (under the same
  64  *  conditions as for reception, but depending on the TXF bit).
  65  *  The driver then cleans up the buffer.
  66  */
  67
  68 #include <linux/kernel.h>
  69 #include <linux/string.h>
  70 #include <linux/errno.h>
  71 #include <linux/unistd.h>
  72 #include <linux/slab.h>
  73 #include <linux/interrupt.h>
  74 #include <linux/init.h>
  75 #include <linux/delay.h>
  76 #include <linux/netdevice.h>
  77 #include <linux/etherdevice.h>
  78 #include <linux/skbuff.h>
  79 #include <linux/if_vlan.h>
  80 #include <linux/spinlock.h>
  81 #include <linux/mm.h>
  82 #include <linux/platform_device.h>
  83 #include <linux/ip.h>
  84 #include <linux/tcp.h>
  85 #include <linux/udp.h>
  86 #include <linux/in.h>
  87
  88 #include <asm/io.h>
  89 #include <asm/irq.h>
  90 #include <asm/uaccess.h>
  91 #include <linux/module.h>
  92 #include <linux/dma-mapping.h>
  93 #include <linux/crc32.h>
  94 #include <linux/mii.h>
  95 #include <linux/phy.h>
  96
  97 #include "gianfar.h"
  98 #include "gianfar_mii.h"
  99
 100 #define TX_TIMEOUT      (1*HZ)
 101 #define SKB_ALLOC_TIMEOUT 1000000
 102 #undef BRIEF_GFAR_ERRORS
 103 #undef VERBOSE_GFAR_ERRORS
 104
 105 #ifdef CONFIG_GFAR_NAPI
 106 #define RECEIVE(x) netif_receive_skb(x)
 107 #else
 108 #define RECEIVE(x) netif_rx(x)
 109 #endif
 110
 111 const char gfar_driver_name[] = "Gianfar Ethernet";
 112 const char gfar_driver_version[] = "1.3";
 113
 114 static int gfar_enet_open(struct net_device *dev);
 115 static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev);
 116 static void gfar_timeout(struct net_device *dev);
 117 static int gfar_close(struct net_device *dev);
 118 struct sk_buff *gfar_new_skb(struct net_device *dev, struct rxbd8 *bdp);
 119 static struct net_device_stats *gfar_get_stats(struct net_device *dev);
 120 static int gfar_set_mac_address(struct net_device *dev);
 121 static int gfar_change_mtu(struct net_device *dev, int new_mtu);
 122 static irqreturn_t gfar_error(int irq, void *dev_id);
 123 static irqreturn_t gfar_transmit(int irq, void *dev_id);
 124 static irqreturn_t gfar_interrupt(int irq, void *dev_id);
 125 static void adjust_link(struct net_device *dev);
 126 static void init_registers(struct net_device *dev);
 127 static int init_phy(struct net_device *dev);
 128 static int gfar_probe(struct platform_device *pdev);
 129 static int gfar_remove(struct platform_device *pdev);
 130 static void free_skb_resources(struct gfar_private *priv);
 131 static void gfar_set_multi(struct net_device *dev);
 132 static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr);
 133 #ifdef CONFIG_GFAR_NAPI
 134 static int gfar_poll(struct net_device *dev, int *budget);
 135 #endif
 136 #ifdef CONFIG_NET_POLL_CONTROLLER
 137 static void gfar_netpoll(struct net_device *dev);
 138 #endif
 139 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit);
 140 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb, int length);
 141 static void gfar_vlan_rx_register(struct net_device *netdev,
 142                                 struct vlan_group *grp);
 143 static void gfar_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 144 void gfar_halt(struct net_device *dev);
 145 void gfar_start(struct net_device *dev);
 146 static void gfar_clear_exact_match(struct net_device *dev);
 147 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr);
 148
 149 extern const struct ethtool_ops gfar_ethtool_ops;
 150
 151 MODULE_AUTHOR("Freescale Semiconductor, Inc");
 152 MODULE_DESCRIPTION("Gianfar Ethernet Driver");
 153 MODULE_LICENSE("GPL");
 154
 155 /* Returns 1 if incoming frames use an FCB */
 156 static inline int gfar_uses_fcb(struct gfar_private *priv)
 157 {
 158         return (priv->vlan_enable || priv->rx_csum_enable);
 159 }
 160
 161 /* Set up the ethernet device structure, private data,
 162  * and anything else we need before we start */
 163 static int gfar_probe(struct platform_device *pdev)
 164 {
 165         u32 tempval;
 166         struct net_device *dev = NULL;
 167         struct gfar_private *priv = NULL;
 168         struct gianfar_platform_data *einfo;
 169         struct resource *r;
 170         int idx;
 171         int err = 0;
 172
 173         einfo = (struct gianfar_platform_data *) pdev->dev.platform_data;
 174
 175         if (NULL == einfo) {
 176                 printk(KERN_ERR "gfar %d: Missing additional data!\n",
 177                        pdev->id);
 178
 179                 return -ENODEV;
 180         }
 181
 182         /* Create an ethernet device instance */
 183         dev = alloc_etherdev(sizeof (*priv));
 184
 185         if (NULL == dev)
 186                 return -ENOMEM;
 187
 188         priv = netdev_priv(dev);
 189
 190         /* Set the info in the priv to the current info */
 191         priv->einfo = einfo;
 192
 193         /* fill out IRQ fields */
 194         if (einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 195                 priv->interruptTransmit = platform_get_irq_byname(pdev, "tx");
 196                 priv->interruptReceive = platform_get_irq_byname(pdev, "rx");
 197                 priv->interruptError = platform_get_irq_byname(pdev, "error");
 198                 if (priv->interruptTransmit < 0 || priv->interruptReceive < 0 || priv->interruptError < 0)
 199                         goto regs_fail;
 200         } else {
 201                 priv->interruptTransmit = platform_get_irq(pdev, 0);
 202                 if (priv->interruptTransmit < 0)
 203                         goto regs_fail;
 204         }
 205
 206         /* get a pointer to the register memory */
 207         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 208         priv->regs = ioremap(r->start, sizeof (struct gfar));
 209
 210         if (NULL == priv->regs) {
 211                 err = -ENOMEM;
 212                 goto regs_fail;
 213         }
 214
 215         spin_lock_init(&priv->txlock);
 216         spin_lock_init(&priv->rxlock);
 217
 218         platform_set_drvdata(pdev, dev);
 219
 220         /* Stop the DMA engine now, in case it was running before */
 221         /* (The firmware could have used it, and left it running). */
 222         /* To do this, we write Graceful Receive Stop and Graceful */
 223         /* Transmit Stop, and then wait until the corresponding bits */
 224         /* in IEVENT indicate the stops have completed. */
 225         tempval = gfar_read(&priv->regs->dmactrl);
 226         tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
 227         gfar_write(&priv->regs->dmactrl, tempval);
 228
 229         tempval = gfar_read(&priv->regs->dmactrl);
 230         tempval |= (DMACTRL_GRS | DMACTRL_GTS);
 231         gfar_write(&priv->regs->dmactrl, tempval);
 232
 233         while (!(gfar_read(&priv->regs->ievent) & (IEVENT_GRSC | IEVENT_GTSC)))
 234                 cpu_relax();
 235
 236         /* Reset MAC layer */
 237         gfar_write(&priv->regs->maccfg1, MACCFG1_SOFT_RESET);
 238
 239         tempval = (MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
 240         gfar_write(&priv->regs->maccfg1, tempval);
 241
 242         /* Initialize MACCFG2. */
 243         gfar_write(&priv->regs->maccfg2, MACCFG2_INIT_SETTINGS);
 244
 245         /* Initialize ECNTRL */
 246         gfar_write(&priv->regs->ecntrl, ECNTRL_INIT_SETTINGS);
 247
 248         /* Copy the station address into the dev structure, */
 249         memcpy(dev->dev_addr, einfo->mac_addr, MAC_ADDR_LEN);
 250
 251         /* Set the dev->base_addr to the gfar reg region */
 252         dev->base_addr = (unsigned long) (priv->regs);
 253
 254         SET_MODULE_OWNER(dev);
 255         SET_NETDEV_DEV(dev, &pdev->dev);
 256
 257         /* Fill in the dev structure */
 258         dev->open = gfar_enet_open;
 259         dev->hard_start_xmit = gfar_start_xmit;
 260         dev->tx_timeout = gfar_timeout;
 261         dev->watchdog_timeo = TX_TIMEOUT;
 262 #ifdef CONFIG_GFAR_NAPI
 263         dev->poll = gfar_poll;
 264         dev->weight = GFAR_DEV_WEIGHT;
 265 #endif
 266 #ifdef CONFIG_NET_POLL_CONTROLLER
 267         dev->poll_controller = gfar_netpoll;
 268 #endif
 269         dev->stop = gfar_close;
 270         dev->get_stats = gfar_get_stats;
 271         dev->change_mtu = gfar_change_mtu;
 272         dev->mtu = 1500;
 273         dev->set_multicast_list = gfar_set_multi;
 274
 275         dev->ethtool_ops = &gfar_ethtool_ops;
 276
 277         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_CSUM) {
 278                 priv->rx_csum_enable = 1;
 279                 dev->features |= NETIF_F_IP_CSUM;
 280         } else
 281                 priv->rx_csum_enable = 0;
 282
 283         priv->vlgrp = NULL;
 284
 285         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_VLAN) {
 286                 dev->vlan_rx_register = gfar_vlan_rx_register;
 287                 dev->vlan_rx_kill_vid = gfar_vlan_rx_kill_vid;
 288
 289                 dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
 290
 291                 priv->vlan_enable = 1;
 292         }
 293
 294         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_EXTENDED_HASH) {
 295                 priv->extended_hash = 1;
 296                 priv->hash_width = 9;
 297
 298                 priv->hash_regs[0] = &priv->regs->igaddr0;
 299                 priv->hash_regs[1] = &priv->regs->igaddr1;
 300                 priv->hash_regs[2] = &priv->regs->igaddr2;
 301                 priv->hash_regs[3] = &priv->regs->igaddr3;
 302                 priv->hash_regs[4] = &priv->regs->igaddr4;
 303                 priv->hash_regs[5] = &priv->regs->igaddr5;
 304                 priv->hash_regs[6] = &priv->regs->igaddr6;
 305                 priv->hash_regs[7] = &priv->regs->igaddr7;
 306                 priv->hash_regs[8] = &priv->regs->gaddr0;
 307                 priv->hash_regs[9] = &priv->regs->gaddr1;
 308                 priv->hash_regs[10] = &priv->regs->gaddr2;
 309                 priv->hash_regs[11] = &priv->regs->gaddr3;
 310                 priv->hash_regs[12] = &priv->regs->gaddr4;
 311                 priv->hash_regs[13] = &priv->regs->gaddr5;
 312                 priv->hash_regs[14] = &priv->regs->gaddr6;
 313                 priv->hash_regs[15] = &priv->regs->gaddr7;
 314
 315         } else {
 316                 priv->extended_hash = 0;
 317                 priv->hash_width = 8;
 318
 319                 priv->hash_regs[0] = &priv->regs->gaddr0;
 320                 priv->hash_regs[1] = &priv->regs->gaddr1;
 321                 priv->hash_regs[2] = &priv->regs->gaddr2;
 322                 priv->hash_regs[3] = &priv->regs->gaddr3;
 323                 priv->hash_regs[4] = &priv->regs->gaddr4;
 324                 priv->hash_regs[5] = &priv->regs->gaddr5;
 325                 priv->hash_regs[6] = &priv->regs->gaddr6;
 326                 priv->hash_regs[7] = &priv->regs->gaddr7;
 327         }
 328
 329         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_PADDING)
 330                 priv->padding = DEFAULT_PADDING;
 331         else
 332                 priv->padding = 0;
 333
 334         if (dev->features & NETIF_F_IP_CSUM)
 335                 dev->hard_header_len += GMAC_FCB_LEN;
 336
 337         priv->rx_buffer_size = DEFAULT_RX_BUFFER_SIZE;
 338         priv->tx_ring_size = DEFAULT_TX_RING_SIZE;
 339         priv->rx_ring_size = DEFAULT_RX_RING_SIZE;
 340
 341         priv->txcoalescing = DEFAULT_TX_COALESCE;
 342         priv->txcount = DEFAULT_TXCOUNT;
 343         priv->txtime = DEFAULT_TXTIME;
 344         priv->rxcoalescing = DEFAULT_RX_COALESCE;
 345         priv->rxcount = DEFAULT_RXCOUNT;
 346         priv->rxtime = DEFAULT_RXTIME;
 347
 348         /* Enable most messages by default */
 349         priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
 350
 351         err = register_netdev(dev);
 352
 353         if (err) {
 354                 printk(KERN_ERR "%s: Cannot register net device, aborting.\n",
 355                                 dev->name);
 356                 goto register_fail;
 357         }
 358
 359         /* Create all the sysfs files */
 360         gfar_init_sysfs(dev);
 361
 362         /* Print out the device info */
 363         printk(KERN_INFO DEVICE_NAME, dev->name);
 364         for (idx = 0; idx < 6; idx++)
 365                 printk("%2.2x%c", dev->dev_addr[idx], idx == 5 ? ' ' : ':');
 366         printk("\n");
 367
 368         /* Even more device info helps when determining which kernel */
 369         /* provided which set of benchmarks. */
 370 #ifdef CONFIG_GFAR_NAPI
 371         printk(KERN_INFO "%s: Running with NAPI enabled\n", dev->name);
 372 #else
 373         printk(KERN_INFO "%s: Running with NAPI disabled\n", dev->name);
 374 #endif
 375         printk(KERN_INFO "%s: %d/%d RX/TX BD ring size\n",
 376                dev->name, priv->rx_ring_size, priv->tx_ring_size);
 377
 378         return 0;
 379
 380 register_fail:
 381         iounmap(priv->regs);
 382 regs_fail:
 383         free_netdev(dev);
 384         return err;
 385 }
 386
 387 static int gfar_remove(struct platform_device *pdev)
 388 {
 389         struct net_device *dev = platform_get_drvdata(pdev);
 390         struct gfar_private *priv = netdev_priv(dev);
 391
 392         platform_set_drvdata(pdev, NULL);
 393
 394         iounmap(priv->regs);
 395         free_netdev(dev);
 396
 397         return 0;
 398 }
 399
 400
 401 /* Reads the controller's registers to determine what interface
 402  * connects it to the PHY.
 403  */
 404 static phy_interface_t gfar_get_interface(struct net_device *dev)
 405 {
 406         struct gfar_private *priv = netdev_priv(dev);
 407         u32 ecntrl = gfar_read(&priv->regs->ecntrl);
 408
 409         if (ecntrl & ECNTRL_SGMII_MODE)
 410                 return PHY_INTERFACE_MODE_SGMII;
 411
 412         if (ecntrl & ECNTRL_TBI_MODE) {
 413                 if (ecntrl & ECNTRL_REDUCED_MODE)
 414                         return PHY_INTERFACE_MODE_RTBI;
 415                 else
 416                         return PHY_INTERFACE_MODE_TBI;
 417         }
 418
 419         if (ecntrl & ECNTRL_REDUCED_MODE) {
 420                 if (ecntrl & ECNTRL_REDUCED_MII_MODE)
 421                         return PHY_INTERFACE_MODE_RMII;
 422                 else
 423                         return PHY_INTERFACE_MODE_RGMII;
 424         }
 425
 426         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT)
 427                 return PHY_INTERFACE_MODE_GMII;
 428
 429         return PHY_INTERFACE_MODE_MII;
 430 }
 431
 432
 433 /* Initializes driver's PHY state, and attaches to the PHY.
 434  * Returns 0 on success.
 435  */
 436 static int init_phy(struct net_device *dev)
 437 {
 438         struct gfar_private *priv = netdev_priv(dev);
 439         uint gigabit_support =
 440                 priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT ?
 441                 SUPPORTED_1000baseT_Full : 0;
 442         struct phy_device *phydev;
 443         char phy_id[BUS_ID_SIZE];
 444         phy_interface_t interface;
 445
 446         priv->oldlink = 0;
 447         priv->oldspeed = 0;
 448         priv->oldduplex = -1;
 449
 450         snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT, priv->einfo->bus_id, priv->einfo->phy_id);
 451
 452         interface = gfar_get_interface(dev);
 453
 454         phydev = phy_connect(dev, phy_id, &adjust_link, 0, interface);
 455
 456         if (IS_ERR(phydev)) {
 457                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 458                 return PTR_ERR(phydev);
 459         }
 460
 461         /* Remove any features not supported by the controller */
 462         phydev->supported &= (GFAR_SUPPORTED | gigabit_support);
 463         phydev->advertising = phydev->supported;
 464
 465         priv->phydev = phydev;
 466
 467         return 0;
 468 }
 469
 470 static void init_registers(struct net_device *dev)
 471 {
 472         struct gfar_private *priv = netdev_priv(dev);
 473
 474         /* Clear IEVENT */
 475         gfar_write(&priv->regs->ievent, IEVENT_INIT_CLEAR);
 476
 477         /* Initialize IMASK */
 478         gfar_write(&priv->regs->imask, IMASK_INIT_CLEAR);
 479
 480         /* Init hash registers to zero */
 481         gfar_write(&priv->regs->igaddr0, 0);
 482         gfar_write(&priv->regs->igaddr1, 0);
 483         gfar_write(&priv->regs->igaddr2, 0);
 484         gfar_write(&priv->regs->igaddr3, 0);
 485         gfar_write(&priv->regs->igaddr4, 0);
 486         gfar_write(&priv->regs->igaddr5, 0);
 487         gfar_write(&priv->regs->igaddr6, 0);
 488         gfar_write(&priv->regs->igaddr7, 0);
 489
 490         gfar_write(&priv->regs->gaddr0, 0);
 491         gfar_write(&priv->regs->gaddr1, 0);
 492         gfar_write(&priv->regs->gaddr2, 0);
 493         gfar_write(&priv->regs->gaddr3, 0);
 494         gfar_write(&priv->regs->gaddr4, 0);
 495         gfar_write(&priv->regs->gaddr5, 0);
 496         gfar_write(&priv->regs->gaddr6, 0);
 497         gfar_write(&priv->regs->gaddr7, 0);
 498
 499         /* Zero out the rmon mib registers if it has them */
 500         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
 501                 memset_io(&(priv->regs->rmon), 0, sizeof (struct rmon_mib));
 502
 503                 /* Mask off the CAM interrupts */
 504                 gfar_write(&priv->regs->rmon.cam1, 0xffffffff);
 505                 gfar_write(&priv->regs->rmon.cam2, 0xffffffff);
 506         }
 507
 508         /* Initialize the max receive buffer length */
 509         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
 510
 511         /* Initialize the Minimum Frame Length Register */
 512         gfar_write(&priv->regs->minflr, MINFLR_INIT_SETTINGS);
 513
 514         /* Assign the TBI an address which won't conflict with the PHYs */
 515         gfar_write(&priv->regs->tbipa, TBIPA_VALUE);
 516 }
 517
 518
 519 /* Halt the receive and transmit queues */
 520 void gfar_halt(struct net_device *dev)
 521 {
 522         struct gfar_private *priv = netdev_priv(dev);
 523         struct gfar __iomem *regs = priv->regs;
 524         u32 tempval;
 525
 526         /* Mask all interrupts */
 527         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 528
 529         /* Clear all interrupts */
 530         gfar_write(&regs->ievent, IEVENT_INIT_CLEAR);
 531
 532         /* Stop the DMA, and wait for it to stop */
 533         tempval = gfar_read(&priv->regs->dmactrl);
 534         if ((tempval & (DMACTRL_GRS | DMACTRL_GTS))
 535             != (DMACTRL_GRS | DMACTRL_GTS)) {
 536                 tempval |= (DMACTRL_GRS | DMACTRL_GTS);
 537                 gfar_write(&priv->regs->dmactrl, tempval);
 538
 539                 while (!(gfar_read(&priv->regs->ievent) &
 540                          (IEVENT_GRSC | IEVENT_GTSC)))
 541                         cpu_relax();
 542         }
 543
 544         /* Disable Rx and Tx */
 545         tempval = gfar_read(&regs->maccfg1);
 546         tempval &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
 547         gfar_write(&regs->maccfg1, tempval);
 548 }
 549
 550 void stop_gfar(struct net_device *dev)
 551 {
 552         struct gfar_private *priv = netdev_priv(dev);
 553         struct gfar __iomem *regs = priv->regs;
 554         unsigned long flags;
 555
 556         phy_stop(priv->phydev);
 557
 558         /* Lock it down */
 559         spin_lock_irqsave(&priv->txlock, flags);
 560         spin_lock(&priv->rxlock);
 561
 562         gfar_halt(dev);
 563
 564         spin_unlock(&priv->rxlock);
 565         spin_unlock_irqrestore(&priv->txlock, flags);
 566
 567         /* Free the IRQs */
 568         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 569                 free_irq(priv->interruptError, dev);
 570                 free_irq(priv->interruptTransmit, dev);
 571                 free_irq(priv->interruptReceive, dev);
 572         } else {
 573                 free_irq(priv->interruptTransmit, dev);
 574         }
 575
 576         free_skb_resources(priv);
 577
 578         dma_free_coherent(NULL,
 579                         sizeof(struct txbd8)*priv->tx_ring_size
 580                         + sizeof(struct rxbd8)*priv->rx_ring_size,
 581                         priv->tx_bd_base,
 582                         gfar_read(&regs->tbase0));
 583 }
 584
 585 /* If there are any tx skbs or rx skbs still around, free them.
 586  * Then free tx_skbuff and rx_skbuff */
 587 static void free_skb_resources(struct gfar_private *priv)
 588 {
 589         struct rxbd8 *rxbdp;
 590         struct txbd8 *txbdp;
 591         int i;
 592
 593         /* Go through all the buffer descriptors and free their data buffers */
 594         txbdp = priv->tx_bd_base;
 595
 596         for (i = 0; i < priv->tx_ring_size; i++) {
 597
 598                 if (priv->tx_skbuff[i]) {
 599                         dma_unmap_single(NULL, txbdp->bufPtr,
 600                                         txbdp->length,
 601                                         DMA_TO_DEVICE);
 602                         dev_kfree_skb_any(priv->tx_skbuff[i]);
 603                         priv->tx_skbuff[i] = NULL;
 604                 }
 605         }
 606
 607         kfree(priv->tx_skbuff);
 608
 609         rxbdp = priv->rx_bd_base;
 610
 611         /* rx_skbuff is not guaranteed to be allocated, so only
 612          * free it and its contents if it is allocated */
 613         if(priv->rx_skbuff != NULL) {
 614                 for (i = 0; i < priv->rx_ring_size; i++) {
 615                         if (priv->rx_skbuff[i]) {
 616                                 dma_unmap_single(NULL, rxbdp->bufPtr,
 617                                                 priv->rx_buffer_size,
 618                                                 DMA_FROM_DEVICE);
 619
 620                                 dev_kfree_skb_any(priv->rx_skbuff[i]);
 621                                 priv->rx_skbuff[i] = NULL;
 622                         }
 623
 624                         rxbdp->status = 0;
 625                         rxbdp->length = 0;
 626                         rxbdp->bufPtr = 0;
 627
 628                         rxbdp++;
 629                 }
 630
 631                 kfree(priv->rx_skbuff);
 632         }
 633 }
 634
 635 void gfar_start(struct net_device *dev)
 636 {
 637         struct gfar_private *priv = netdev_priv(dev);
 638         struct gfar __iomem *regs = priv->regs;
 639         u32 tempval;
 640
 641         /* Enable Rx and Tx in MACCFG1 */
 642         tempval = gfar_read(&regs->maccfg1);
 643         tempval |= (MACCFG1_RX_EN | MACCFG1_TX_EN);
 644         gfar_write(&regs->maccfg1, tempval);
 645
 646         /* Initialize DMACTRL to have WWR and WOP */
 647         tempval = gfar_read(&priv->regs->dmactrl);
 648         tempval |= DMACTRL_INIT_SETTINGS;
 649         gfar_write(&priv->regs->dmactrl, tempval);
 650
 651         /* Make sure we aren't stopped */
 652         tempval = gfar_read(&priv->regs->dmactrl);
 653         tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
 654         gfar_write(&priv->regs->dmactrl, tempval);
 655
 656         /* Clear THLT/RHLT, so that the DMA starts polling now */
 657         gfar_write(&regs->tstat, TSTAT_CLEAR_THALT);
 658         gfar_write(&regs->rstat, RSTAT_CLEAR_RHALT);
 659
 660         /* Unmask the interrupts we look for */
 661         gfar_write(&regs->imask, IMASK_DEFAULT);
 662 }
 663
 664 /* Bring the controller up and running */
 665 int startup_gfar(struct net_device *dev)
 666 {
 667         struct txbd8 *txbdp;
 668         struct rxbd8 *rxbdp;
 669         dma_addr_t addr;
 670         unsigned long vaddr;
 671         int i;
 672         struct gfar_private *priv = netdev_priv(dev);
 673         struct gfar __iomem *regs = priv->regs;
 674         int err = 0;
 675         u32 rctrl = 0;
 676         u32 attrs = 0;
 677
 678         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 679
 680         /* Allocate memory for the buffer descriptors */
 681         vaddr = (unsigned long) dma_alloc_coherent(NULL,
 682                         sizeof (struct txbd8) * priv->tx_ring_size +
 683                         sizeof (struct rxbd8) * priv->rx_ring_size,
 684                         &addr, GFP_KERNEL);
 685
 686         if (vaddr == 0) {
 687                 if (netif_msg_ifup(priv))
 688                         printk(KERN_ERR "%s: Could not allocate buffer descriptors!\n",
 689                                         dev->name);
 690                 return -ENOMEM;
 691         }
 692
 693         priv->tx_bd_base = (struct txbd8 *) vaddr;
 694
 695         /* enet DMA only understands physical addresses */
 696         gfar_write(&regs->tbase0, addr);
 697
 698         /* Start the rx descriptor ring where the tx ring leaves off */
 699         addr = addr + sizeof (struct txbd8) * priv->tx_ring_size;
 700         vaddr = vaddr + sizeof (struct txbd8) * priv->tx_ring_size;
 701         priv->rx_bd_base = (struct rxbd8 *) vaddr;
 702         gfar_write(&regs->rbase0, addr);
 703
 704         /* Setup the skbuff rings */
 705         priv->tx_skbuff =
 706             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 707                                         priv->tx_ring_size, GFP_KERNEL);
 708
 709         if (NULL == priv->tx_skbuff) {
 710                 if (netif_msg_ifup(priv))
 711                         printk(KERN_ERR "%s: Could not allocate tx_skbuff\n",
 712                                         dev->name);
 713                 err = -ENOMEM;
 714                 goto tx_skb_fail;
 715         }
 716
 717         for (i = 0; i < priv->tx_ring_size; i++)
 718                 priv->tx_skbuff[i] = NULL;
 719
 720         priv->rx_skbuff =
 721             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 722                                         priv->rx_ring_size, GFP_KERNEL);
 723
 724         if (NULL == priv->rx_skbuff) {
 725                 if (netif_msg_ifup(priv))
 726                         printk(KERN_ERR "%s: Could not allocate rx_skbuff\n",
 727                                         dev->name);
 728                 err = -ENOMEM;
 729                 goto rx_skb_fail;
 730         }
 731
 732         for (i = 0; i < priv->rx_ring_size; i++)
 733                 priv->rx_skbuff[i] = NULL;
 734
 735         /* Initialize some variables in our dev structure */
 736         priv->dirty_tx = priv->cur_tx = priv->tx_bd_base;
 737         priv->cur_rx = priv->rx_bd_base;
 738         priv->skb_curtx = priv->skb_dirtytx = 0;
 739         priv->skb_currx = 0;
 740
 741         /* Initialize Transmit Descriptor Ring */
 742         txbdp = priv->tx_bd_base;
 743         for (i = 0; i < priv->tx_ring_size; i++) {
 744                 txbdp->status = 0;
 745                 txbdp->length = 0;
 746                 txbdp->bufPtr = 0;
 747                 txbdp++;
 748         }
 749
 750         /* Set the last descriptor in the ring to indicate wrap */
 751         txbdp--;
 752         txbdp->status |= TXBD_WRAP;
 753
 754         rxbdp = priv->rx_bd_base;
 755         for (i = 0; i < priv->rx_ring_size; i++) {
 756                 struct sk_buff *skb = NULL;
 757
 758                 rxbdp->status = 0;
 759
 760                 skb = gfar_new_skb(dev, rxbdp);
 761
 762                 priv->rx_skbuff[i] = skb;
 763
 764                 rxbdp++;
 765         }
 766
 767         /* Set the last descriptor in the ring to wrap */
 768         rxbdp--;
 769         rxbdp->status |= RXBD_WRAP;
 770
 771         /* If the device has multiple interrupts, register for
 772          * them.  Otherwise, only register for the one */
 773         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 774                 /* Install our interrupt handlers for Error,
 775                  * Transmit, and Receive */
 776                 if (request_irq(priv->interruptError, gfar_error,
 777                                 0, "enet_error", dev) < 0) {
 778                         if (netif_msg_intr(priv))
 779                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
 780                                         dev->name, priv->interruptError);
 781
 782                         err = -1;
 783                         goto err_irq_fail;
 784                 }
 785
 786                 if (request_irq(priv->interruptTransmit, gfar_transmit,
 787                                 0, "enet_tx", dev) < 0) {
 788                         if (netif_msg_intr(priv))
 789                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
 790                                         dev->name, priv->interruptTransmit);
 791
 792                         err = -1;
 793
 794                         goto tx_irq_fail;
 795                 }
 796
 797                 if (request_irq(priv->interruptReceive, gfar_receive,
 798                                 0, "enet_rx", dev) < 0) {
 799                         if (netif_msg_intr(priv))
 800                                 printk(KERN_ERR "%s: Can't get IRQ %d (receive0)\n",
 801                                                 dev->name, priv->interruptReceive);
 802
 803                         err = -1;
 804                         goto rx_irq_fail;
 805                 }
 806         } else {
 807                 if (request_irq(priv->interruptTransmit, gfar_interrupt,
 808                                 0, "gfar_interrupt", dev) < 0) {
 809                         if (netif_msg_intr(priv))
 810                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
 811                                         dev->name, priv->interruptError);
 812
 813                         err = -1;
 814                         goto err_irq_fail;
 815                 }
 816         }
 817
 818         phy_start(priv->phydev);
 819
 820         /* Configure the coalescing support */
 821         if (priv->txcoalescing)
 822                 gfar_write(&regs->txic,
 823                            mk_ic_value(priv->txcount, priv->txtime));
 824         else
 825                 gfar_write(&regs->txic, 0);
 826
 827         if (priv->rxcoalescing)
 828                 gfar_write(&regs->rxic,
 829                            mk_ic_value(priv->rxcount, priv->rxtime));
 830         else
 831                 gfar_write(&regs->rxic, 0);
 832
 833         if (priv->rx_csum_enable)
 834                 rctrl |= RCTRL_CHECKSUMMING;
 835
 836         if (priv->extended_hash) {
 837                 rctrl |= RCTRL_EXTHASH;
 838
 839                 gfar_clear_exact_match(dev);
 840                 rctrl |= RCTRL_EMEN;
 841         }
 842
 843         if (priv->vlan_enable)
 844                 rctrl |= RCTRL_VLAN;
 845
 846         if (priv->padding) {
 847                 rctrl &= ~RCTRL_PAL_MASK;
 848                 rctrl |= RCTRL_PADDING(priv->padding);
 849         }
 850
 851         /* Init rctrl based on our settings */
 852         gfar_write(&priv->regs->rctrl, rctrl);
 853
 854         if (dev->features & NETIF_F_IP_CSUM)
 855                 gfar_write(&priv->regs->tctrl, TCTRL_INIT_CSUM);
 856
 857         /* Set the extraction length and index */
 858         attrs = ATTRELI_EL(priv->rx_stash_size) |
 859                 ATTRELI_EI(priv->rx_stash_index);
 860
 861         gfar_write(&priv->regs->attreli, attrs);
 862
 863         /* Start with defaults, and add stashing or locking
 864          * depending on the approprate variables */
 865         attrs = ATTR_INIT_SETTINGS;
 866
 867         if (priv->bd_stash_en)
 868                 attrs |= ATTR_BDSTASH;
 869
 870         if (priv->rx_stash_size != 0)
 871                 attrs |= ATTR_BUFSTASH;
 872
 873         gfar_write(&priv->regs->attr, attrs);
 874
 875         gfar_write(&priv->regs->fifo_tx_thr, priv->fifo_threshold);
 876         gfar_write(&priv->regs->fifo_tx_starve, priv->fifo_starve);
 877         gfar_write(&priv->regs->fifo_tx_starve_shutoff, priv->fifo_starve_off);
 878
 879         /* Start the controller */
 880         gfar_start(dev);
 881
 882         return 0;
 883
 884 rx_irq_fail:
 885         free_irq(priv->interruptTransmit, dev);
 886 tx_irq_fail:
 887         free_irq(priv->interruptError, dev);
 888 err_irq_fail:
 889 rx_skb_fail:
 890         free_skb_resources(priv);
 891 tx_skb_fail:
 892         dma_free_coherent(NULL,
 893                         sizeof(struct txbd8)*priv->tx_ring_size
 894                         + sizeof(struct rxbd8)*priv->rx_ring_size,
 895                         priv->tx_bd_base,
 896                         gfar_read(&regs->tbase0));
 897
 898         return err;
 899 }
 900
 901 /* Called when something needs to use the ethernet device */
 902 /* Returns 0 for success. */
 903 static int gfar_enet_open(struct net_device *dev)
 904 {
 905         int err;
 906
 907         /* Initialize a bunch of registers */
 908         init_registers(dev);
 909
 910         gfar_set_mac_address(dev);
 911
 912         err = init_phy(dev);
 913
 914         if(err)
 915                 return err;
 916
 917         err = startup_gfar(dev);
 918
 919         netif_start_queue(dev);
 920
 921         return err;
 922 }
 923
 924 static inline struct txfcb *gfar_add_fcb(struct sk_buff *skb, struct txbd8 *bdp)
 925 {
 926         struct txfcb *fcb = (struct txfcb *)skb_push (skb, GMAC_FCB_LEN);
 927
 928         memset(fcb, 0, GMAC_FCB_LEN);
 929
 930         return fcb;
 931 }
 932
 933 static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
 934 {
 935         u8 flags = 0;
 936
 937         /* If we're here, it's a IP packet with a TCP or UDP
 938          * payload.  We set it to checksum, using a pseudo-header
 939          * we provide
 940          */
 941         flags = TXFCB_DEFAULT;
 942
 943         /* Tell the controller what the protocol is */
 944         /* And provide the already calculated phcs */
 945         if (skb->nh.iph->protocol == IPPROTO_UDP) {
 946                 flags |= TXFCB_UDP;
 947                 fcb->phcs = skb->h.uh->check;
 948         } else
 949                 fcb->phcs = skb->h.th->check;
 950
 951         /* l3os is the distance between the start of the
 952          * frame (skb->data) and the start of the IP hdr.
 953          * l4os is the distance between the start of the
 954          * l3 hdr and the l4 hdr */
 955         fcb->l3os = (u16)(skb->nh.raw - skb->data - GMAC_FCB_LEN);
 956         fcb->l4os = (u16)(skb->h.raw - skb->nh.raw);
 957
 958         fcb->flags = flags;
 959 }
 960
 961 void inline gfar_tx_vlan(struct sk_buff *skb, struct txfcb *fcb)
 962 {
 963         fcb->flags |= TXFCB_VLN;
 964         fcb->vlctl = vlan_tx_tag_get(skb);
 965 }
 966
 967 /* This is called by the kernel when a frame is ready for transmission. */
 968 /* It is pointed to by the dev->hard_start_xmit function pointer */
 969 static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
 970 {
 971         struct gfar_private *priv = netdev_priv(dev);
 972         struct txfcb *fcb = NULL;
 973         struct txbd8 *txbdp;
 974         u16 status;
 975         unsigned long flags;
 976
 977         /* Update transmit stats */
 978         priv->stats.tx_bytes += skb->len;
 979
 980         /* Lock priv now */
 981         spin_lock_irqsave(&priv->txlock, flags);
 982
 983         /* Point at the first free tx descriptor */
 984         txbdp = priv->cur_tx;
 985
 986         /* Clear all but the WRAP status flags */
 987         status = txbdp->status & TXBD_WRAP;
 988
 989         /* Set up checksumming */
 990         if (likely((dev->features & NETIF_F_IP_CSUM)
 991                         && (CHECKSUM_PARTIAL == skb->ip_summed))) {
 992                 fcb = gfar_add_fcb(skb, txbdp);
 993                 status |= TXBD_TOE;
 994                 gfar_tx_checksum(skb, fcb);
 995         }
 996
 997         if (priv->vlan_enable &&
 998                         unlikely(priv->vlgrp && vlan_tx_tag_present(skb))) {
 999                 if (unlikely(NULL == fcb)) {
1000                         fcb = gfar_add_fcb(skb, txbdp);
1001                         status |= TXBD_TOE;
1002                 }
1003
1004                 gfar_tx_vlan(skb, fcb);
1005         }
1006
1007         /* Set buffer length and pointer */
1008         txbdp->length = skb->len;
1009         txbdp->bufPtr = dma_map_single(NULL, skb->data,
1010                         skb->len, DMA_TO_DEVICE);
1011
1012         /* Save the skb pointer so we can free it later */
1013         priv->tx_skbuff[priv->skb_curtx] = skb;
1014
1015         /* Update the current skb pointer (wrapping if this was the last) */
1016         priv->skb_curtx =
1017             (priv->skb_curtx + 1) & TX_RING_MOD_MASK(priv->tx_ring_size);
1018
1019         /* Flag the BD as interrupt-causing */
1020         status |= TXBD_INTERRUPT;
1021
1022         /* Flag the BD as ready to go, last in frame, and  */
1023         /* in need of CRC */
1024         status |= (TXBD_READY | TXBD_LAST | TXBD_CRC);
1025
1026         dev->trans_start = jiffies;
1027
1028         txbdp->status = status;
1029
1030         /* If this was the last BD in the ring, the next one */
1031         /* is at the beginning of the ring */
1032         if (txbdp->status & TXBD_WRAP)
1033                 txbdp = priv->tx_bd_base;
1034         else
1035                 txbdp++;
1036
1037         /* If the next BD still needs to be cleaned up, then the bds
1038            are full.  We need to tell the kernel to stop sending us stuff. */
1039         if (txbdp == priv->dirty_tx) {
1040                 netif_stop_queue(dev);
1041
1042                 priv->stats.tx_fifo_errors++;
1043         }
1044
1045         /* Update the current txbd to the next one */
1046         priv->cur_tx = txbdp;
1047
1048         /* Tell the DMA to go go go */
1049         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
1050
1051         /* Unlock priv */
1052         spin_unlock_irqrestore(&priv->txlock, flags);
1053
1054         return 0;
1055 }
1056
1057 /* Stops the kernel queue, and halts the controller */
1058 static int gfar_close(struct net_device *dev)
1059 {
1060         struct gfar_private *priv = netdev_priv(dev);
1061         stop_gfar(dev);
1062
1063         /* Disconnect from the PHY */
1064         phy_disconnect(priv->phydev);
1065         priv->phydev = NULL;
1066
1067         netif_stop_queue(dev);
1068
1069         return 0;
1070 }
1071
1072 /* returns a net_device_stats structure pointer */
1073 static struct net_device_stats * gfar_get_stats(struct net_device *dev)
1074 {
1075         struct gfar_private *priv = netdev_priv(dev);
1076
1077         return &(priv->stats);
1078 }
1079
1080 /* Changes the mac address if the controller is not running. */
1081 int gfar_set_mac_address(struct net_device *dev)
1082 {
1083         gfar_set_mac_for_addr(dev, 0, dev->dev_addr);
1084
1085         return 0;
1086 }
1087
1088
1089 /* Enables and disables VLAN insertion/extraction */
1090 static void gfar_vlan_rx_register(struct net_device *dev,
1091                 struct vlan_group *grp)
1092 {
1093         struct gfar_private *priv = netdev_priv(dev);
1094         unsigned long flags;
1095         u32 tempval;
1096
1097         spin_lock_irqsave(&priv->rxlock, flags);
1098
1099         priv->vlgrp = grp;
1100
1101         if (grp) {
1102                 /* Enable VLAN tag insertion */
1103                 tempval = gfar_read(&priv->regs->tctrl);
1104                 tempval |= TCTRL_VLINS;
1105
1106                 gfar_write(&priv->regs->tctrl, tempval);
1107
1108                 /* Enable VLAN tag extraction */
1109                 tempval = gfar_read(&priv->regs->rctrl);
1110                 tempval |= RCTRL_VLEX;
1111                 gfar_write(&priv->regs->rctrl, tempval);
1112         } else {
1113                 /* Disable VLAN tag insertion */
1114                 tempval = gfar_read(&priv->regs->tctrl);
1115                 tempval &= ~TCTRL_VLINS;
1116                 gfar_write(&priv->regs->tctrl, tempval);
1117
1118                 /* Disable VLAN tag extraction */
1119                 tempval = gfar_read(&priv->regs->rctrl);
1120                 tempval &= ~RCTRL_VLEX;
1121                 gfar_write(&priv->regs->rctrl, tempval);
1122         }
1123
1124         spin_unlock_irqrestore(&priv->rxlock, flags);
1125 }
1126
1127
1128 static void gfar_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
1129 {
1130         struct gfar_private *priv = netdev_priv(dev);
1131         unsigned long flags;
1132
1133         spin_lock_irqsave(&priv->rxlock, flags);
1134
1135         vlan_group_set_device(priv->vlgrp, vid, NULL);
1136
1137         spin_unlock_irqrestore(&priv->rxlock, flags);
1138 }
1139
1140
1141 static int gfar_change_mtu(struct net_device *dev, int new_mtu)
1142 {
1143         int tempsize, tempval;
1144         struct gfar_private *priv = netdev_priv(dev);
1145         int oldsize = priv->rx_buffer_size;
1146         int frame_size = new_mtu + ETH_HLEN;
1147
1148         if (priv->vlan_enable)
1149                 frame_size += VLAN_ETH_HLEN;
1150
1151         if (gfar_uses_fcb(priv))
1152                 frame_size += GMAC_FCB_LEN;
1153
1154         frame_size += priv->padding;
1155
1156         if ((frame_size < 64) || (frame_size > JUMBO_FRAME_SIZE)) {
1157                 if (netif_msg_drv(priv))
1158                         printk(KERN_ERR "%s: Invalid MTU setting\n",
1159                                         dev->name);
1160                 return -EINVAL;
1161         }
1162
1163         tempsize =
1164             (frame_size & ~(INCREMENTAL_BUFFER_SIZE - 1)) +
1165             INCREMENTAL_BUFFER_SIZE;
1166
1167         /* Only stop and start the controller if it isn't already
1168          * stopped, and we changed something */
1169         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1170                 stop_gfar(dev);
1171
1172         priv->rx_buffer_size = tempsize;
1173
1174         dev->mtu = new_mtu;
1175
1176         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
1177         gfar_write(&priv->regs->maxfrm, priv->rx_buffer_size);
1178
1179         /* If the mtu is larger than the max size for standard
1180          * ethernet frames (ie, a jumbo frame), then set maccfg2
1181          * to allow huge frames, and to check the length */
1182         tempval = gfar_read(&priv->regs->maccfg2);
1183
1184         if (priv->rx_buffer_size > DEFAULT_RX_BUFFER_SIZE)
1185                 tempval |= (MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1186         else
1187                 tempval &= ~(MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1188
1189         gfar_write(&priv->regs->maccfg2, tempval);
1190
1191         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1192                 startup_gfar(dev);
1193
1194         return 0;
1195 }
1196
1197 /* gfar_timeout gets called when a packet has not been
1198  * transmitted after a set amount of time.
1199  * For now, assume that clearing out all the structures, and
1200  * starting over will fix the problem. */
1201 static void gfar_timeout(struct net_device *dev)
1202 {
1203         struct gfar_private *priv = netdev_priv(dev);
1204
1205         priv->stats.tx_errors++;
1206
1207         if (dev->flags & IFF_UP) {
1208                 stop_gfar(dev);
1209                 startup_gfar(dev);
1210         }
1211
1212         netif_schedule(dev);
1213 }
1214
1215 /* Interrupt Handler for Transmit complete */
1216 static irqreturn_t gfar_transmit(int irq, void *dev_id)
1217 {
1218         struct net_device *dev = (struct net_device *) dev_id;
1219         struct gfar_private *priv = netdev_priv(dev);
1220         struct txbd8 *bdp;
1221
1222         /* Clear IEVENT */
1223         gfar_write(&priv->regs->ievent, IEVENT_TX_MASK);
1224
1225         /* Lock priv */
1226         spin_lock(&priv->txlock);
1227         bdp = priv->dirty_tx;
1228         while ((bdp->status & TXBD_READY) == 0) {
1229                 /* If dirty_tx and cur_tx are the same, then either the */
1230                 /* ring is empty or full now (it could only be full in the beginning, */
1231                 /* obviously).  If it is empty, we are done. */
1232                 if ((bdp == priv->cur_tx) && (netif_queue_stopped(dev) == 0))
1233                         break;
1234
1235                 priv->stats.tx_packets++;
1236
1237                 /* Deferred means some collisions occurred during transmit, */
1238                 /* but we eventually sent the packet. */
1239                 if (bdp->status & TXBD_DEF)
1240                         priv->stats.collisions++;
1241
1242                 /* Free the sk buffer associated with this TxBD */
1243                 dev_kfree_skb_irq(priv->tx_skbuff[priv->skb_dirtytx]);
1244                 priv->tx_skbuff[priv->skb_dirtytx] = NULL;
1245                 priv->skb_dirtytx =
1246                     (priv->skb_dirtytx +
1247                      1) & TX_RING_MOD_MASK(priv->tx_ring_size);
1248
1249                 /* update bdp to point at next bd in the ring (wrapping if necessary) */
1250                 if (bdp->status & TXBD_WRAP)
1251                         bdp = priv->tx_bd_base;
1252                 else
1253                         bdp++;
1254
1255                 /* Move dirty_tx to be the next bd */
1256                 priv->dirty_tx = bdp;
1257
1258                 /* We freed a buffer, so now we can restart transmission */
1259                 if (netif_queue_stopped(dev))
1260                         netif_wake_queue(dev);
1261         } /* while ((bdp->status & TXBD_READY) == 0) */
1262
1263         /* If we are coalescing the interrupts, reset the timer */
1264         /* Otherwise, clear it */
1265         if (priv->txcoalescing)
1266                 gfar_write(&priv->regs->txic,
1267                            mk_ic_value(priv->txcount, priv->txtime));
1268         else
1269                 gfar_write(&priv->regs->txic, 0);
1270
1271         spin_unlock(&priv->txlock);
1272
1273         return IRQ_HANDLED;
1274 }
1275
1276 struct sk_buff * gfar_new_skb(struct net_device *dev, struct rxbd8 *bdp)
1277 {
1278         unsigned int alignamount;
1279         struct gfar_private *priv = netdev_priv(dev);
1280         struct sk_buff *skb = NULL;
1281         unsigned int timeout = SKB_ALLOC_TIMEOUT;
1282
1283         /* We have to allocate the skb, so keep trying till we succeed */
1284         while ((!skb) && timeout--)
1285                 skb = dev_alloc_skb(priv->rx_buffer_size + RXBUF_ALIGNMENT);
1286
1287         if (NULL == skb)
1288                 return NULL;
1289
1290         alignamount = RXBUF_ALIGNMENT -
1291                 (((unsigned) skb->data) & (RXBUF_ALIGNMENT - 1));
1292
1293         /* We need the data buffer to be aligned properly.  We will reserve
1294          * as many bytes as needed to align the data properly
1295          */
1296         skb_reserve(skb, alignamount);
1297
1298         skb->dev = dev;
1299
1300         bdp->bufPtr = dma_map_single(NULL, skb->data,
1301                         priv->rx_buffer_size, DMA_FROM_DEVICE);
1302
1303         bdp->length = 0;
1304
1305         /* Mark the buffer empty */
1306         bdp->status |= (RXBD_EMPTY | RXBD_INTERRUPT);
1307
1308         return skb;
1309 }
1310
1311 static inline void count_errors(unsigned short status, struct gfar_private *priv)
1312 {
1313         struct net_device_stats *stats = &priv->stats;
1314         struct gfar_extra_stats *estats = &priv->extra_stats;
1315
1316         /* If the packet was truncated, none of the other errors
1317          * matter */
1318         if (status & RXBD_TRUNCATED) {
1319                 stats->rx_length_errors++;
1320
1321                 estats->rx_trunc++;
1322
1323                 return;
1324         }
1325         /* Count the errors, if there were any */
1326         if (status & (RXBD_LARGE | RXBD_SHORT)) {
1327                 stats->rx_length_errors++;
1328
1329                 if (status & RXBD_LARGE)
1330                         estats->rx_large++;
1331                 else
1332                         estats->rx_short++;
1333         }
1334         if (status & RXBD_NONOCTET) {
1335                 stats->rx_frame_errors++;
1336                 estats->rx_nonoctet++;
1337         }
1338         if (status & RXBD_CRCERR) {
1339                 estats->rx_crcerr++;
1340                 stats->rx_crc_errors++;
1341         }
1342         if (status & RXBD_OVERRUN) {
1343                 estats->rx_overrun++;
1344                 stats->rx_crc_errors++;
1345         }
1346 }
1347
1348 irqreturn_t gfar_receive(int irq, void *dev_id)
1349 {
1350         struct net_device *dev = (struct net_device *) dev_id;
1351         struct gfar_private *priv = netdev_priv(dev);
1352 #ifdef CONFIG_GFAR_NAPI
1353         u32 tempval;
1354 #else
1355         unsigned long flags;
1356 #endif
1357
1358         /* Clear IEVENT, so rx interrupt isn't called again
1359          * because of this interrupt */
1360         gfar_write(&priv->regs->ievent, IEVENT_RX_MASK);
1361
1362         /* support NAPI */
1363 #ifdef CONFIG_GFAR_NAPI
1364         if (netif_rx_schedule_prep(dev)) {
1365                 tempval = gfar_read(&priv->regs->imask);
1366                 tempval &= IMASK_RX_DISABLED;
1367                 gfar_write(&priv->regs->imask, tempval);
1368
1369                 __netif_rx_schedule(dev);
1370         } else {
1371                 if (netif_msg_rx_err(priv))
1372                         printk(KERN_DEBUG "%s: receive called twice (%x)[%x]\n",
1373                                 dev->name, gfar_read(&priv->regs->ievent),
1374                                 gfar_read(&priv->regs->imask));
1375         }
1376 #else
1377
1378         spin_lock_irqsave(&priv->rxlock, flags);
1379         gfar_clean_rx_ring(dev, priv->rx_ring_size);
1380
1381         /* If we are coalescing interrupts, update the timer */
1382         /* Otherwise, clear it */
1383         if (priv->rxcoalescing)
1384                 gfar_write(&priv->regs->rxic,
1385                            mk_ic_value(priv->rxcount, priv->rxtime));
1386         else
1387                 gfar_write(&priv->regs->rxic, 0);
1388
1389         spin_unlock_irqrestore(&priv->rxlock, flags);
1390 #endif
1391
1392         return IRQ_HANDLED;
1393 }
1394
1395 static inline int gfar_rx_vlan(struct sk_buff *skb,
1396                 struct vlan_group *vlgrp, unsigned short vlctl)
1397 {
1398 #ifdef CONFIG_GFAR_NAPI
1399         return vlan_hwaccel_receive_skb(skb, vlgrp, vlctl);
1400 #else
1401         return vlan_hwaccel_rx(skb, vlgrp, vlctl);
1402 #endif
1403 }
1404
1405 static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
1406 {
1407         /* If valid headers were found, and valid sums
1408          * were verified, then we tell the kernel that no
1409          * checksumming is necessary.  Otherwise, it is */
1410         if ((fcb->flags & RXFCB_CSUM_MASK) == (RXFCB_CIP | RXFCB_CTU))
1411                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1412         else
1413                 skb->ip_summed = CHECKSUM_NONE;
1414 }
1415
1416
1417 static inline struct rxfcb *gfar_get_fcb(struct sk_buff *skb)
1418 {
1419         struct rxfcb *fcb = (struct rxfcb *)skb->data;
1420
1421         /* Remove the FCB from the skb */
1422         skb_pull(skb, GMAC_FCB_LEN);
1423
1424         return fcb;
1425 }
1426
1427 /* gfar_process_frame() -- handle one incoming packet if skb
1428  * isn't NULL.  */
1429 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
1430                 int length)
1431 {
1432         struct gfar_private *priv = netdev_priv(dev);
1433         struct rxfcb *fcb = NULL;
1434
1435         if (NULL == skb) {
1436                 if (netif_msg_rx_err(priv))
1437                         printk(KERN_WARNING "%s: Missing skb!!.\n", dev->name);
1438                 priv->stats.rx_dropped++;
1439                 priv->extra_stats.rx_skbmissing++;
1440         } else {
1441                 int ret;
1442
1443                 /* Prep the skb for the packet */
1444                 skb_put(skb, length);
1445
1446                 /* Grab the FCB if there is one */
1447                 if (gfar_uses_fcb(priv))
1448                         fcb = gfar_get_fcb(skb);
1449
1450                 /* Remove the padded bytes, if there are any */
1451                 if (priv->padding)
1452                         skb_pull(skb, priv->padding);
1453
1454                 if (priv->rx_csum_enable)
1455                         gfar_rx_checksum(skb, fcb);
1456
1457                 /* Tell the skb what kind of packet this is */
1458                 skb->protocol = eth_type_trans(skb, dev);
1459
1460                 /* Send the packet up the stack */
1461                 if (unlikely(priv->vlgrp && (fcb->flags & RXFCB_VLN)))
1462                         ret = gfar_rx_vlan(skb, priv->vlgrp, fcb->vlctl);
1463                 else
1464                         ret = RECEIVE(skb);
1465
1466                 if (NET_RX_DROP == ret)
1467                         priv->extra_stats.kernel_dropped++;
1468         }
1469
1470         return 0;
1471 }
1472
1473 /* gfar_clean_rx_ring() -- Processes each frame in the rx ring
1474  *   until the budget/quota has been reached. Returns the number
1475  *   of frames handled
1476  */
1477 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
1478 {
1479         struct rxbd8 *bdp;
1480         struct sk_buff *skb;
1481         u16 pkt_len;
1482         int howmany = 0;
1483         struct gfar_private *priv = netdev_priv(dev);
1484
1485         /* Get the first full descriptor */
1486         bdp = priv->cur_rx;
1487
1488         while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
1489                 skb = priv->rx_skbuff[priv->skb_currx];
1490
1491                 if (!(bdp->status &
1492                       (RXBD_LARGE | RXBD_SHORT | RXBD_NONOCTET
1493                        | RXBD_CRCERR | RXBD_OVERRUN | RXBD_TRUNCATED))) {
1494                         /* Increment the number of packets */
1495                         priv->stats.rx_packets++;
1496                         howmany++;
1497
1498                         /* Remove the FCS from the packet length */
1499                         pkt_len = bdp->length - 4;
1500
1501                         gfar_process_frame(dev, skb, pkt_len);
1502
1503                         priv->stats.rx_bytes += pkt_len;
1504                 } else {
1505                         count_errors(bdp->status, priv);
1506
1507                         if (skb)
1508                                 dev_kfree_skb_any(skb);
1509
1510                         priv->rx_skbuff[priv->skb_currx] = NULL;
1511                 }
1512
1513                 dev->last_rx = jiffies;
1514
1515                 /* Clear the status flags for this buffer */
1516                 bdp->status &= ~RXBD_STATS;
1517
1518                 /* Add another skb for the future */
1519                 skb = gfar_new_skb(dev, bdp);
1520                 priv->rx_skbuff[priv->skb_currx] = skb;
1521
1522                 /* Update to the next pointer */
1523                 if (bdp->status & RXBD_WRAP)
1524                         bdp = priv->rx_bd_base;
1525                 else
1526                         bdp++;
1527
1528                 /* update to point at the next skb */
1529                 priv->skb_currx =
1530                     (priv->skb_currx +
1531                      1) & RX_RING_MOD_MASK(priv->rx_ring_size);
1532
1533         }
1534
1535         /* Update the current rxbd pointer to be the next one */
1536         priv->cur_rx = bdp;
1537
1538         return howmany;
1539 }
1540
1541 #ifdef CONFIG_GFAR_NAPI
1542 static int gfar_poll(struct net_device *dev, int *budget)
1543 {
1544         int howmany;
1545         struct gfar_private *priv = netdev_priv(dev);
1546         int rx_work_limit = *budget;
1547
1548         if (rx_work_limit > dev->quota)
1549                 rx_work_limit = dev->quota;
1550
1551         howmany = gfar_clean_rx_ring(dev, rx_work_limit);
1552
1553         dev->quota -= howmany;
1554         rx_work_limit -= howmany;
1555         *budget -= howmany;
1556
1557         if (rx_work_limit > 0) {
1558                 netif_rx_complete(dev);
1559
1560                 /* Clear the halt bit in RSTAT */
1561                 gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
1562
1563                 gfar_write(&priv->regs->imask, IMASK_DEFAULT);
1564
1565                 /* If we are coalescing interrupts, update the timer */
1566                 /* Otherwise, clear it */
1567                 if (priv->rxcoalescing)
1568                         gfar_write(&priv->regs->rxic,
1569                                    mk_ic_value(priv->rxcount, priv->rxtime));
1570                 else
1571                         gfar_write(&priv->regs->rxic, 0);
1572         }
1573
1574         /* Return 1 if there's more work to do */
1575         return (rx_work_limit > 0) ? 0 : 1;
1576 }
1577 #endif
1578
1579 #ifdef CONFIG_NET_POLL_CONTROLLER
1580 /*
1581  * Polling 'interrupt' - used by things like netconsole to send skbs
1582  * without having to re-enable interrupts. It's not called while
1583  * the interrupt routine is executing.
1584  */
1585 static void gfar_netpoll(struct net_device *dev)
1586 {
1587         struct gfar_private *priv = netdev_priv(dev);
1588
1589         /* If the device has multiple interrupts, run tx/rx */
1590         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
1591                 disable_irq(priv->interruptTransmit);
1592                 disable_irq(priv->interruptReceive);
1593                 disable_irq(priv->interruptError);
1594                 gfar_interrupt(priv->interruptTransmit, dev);
1595                 enable_irq(priv->interruptError);
1596                 enable_irq(priv->interruptReceive);
1597                 enable_irq(priv->interruptTransmit);
1598         } else {
1599                 disable_irq(priv->interruptTransmit);
1600                 gfar_interrupt(priv->interruptTransmit, dev);
1601                 enable_irq(priv->interruptTransmit);
1602         }
1603 }
1604 #endif
1605
1606 /* The interrupt handler for devices with one interrupt */
1607 static irqreturn_t gfar_interrupt(int irq, void *dev_id)
1608 {
1609         struct net_device *dev = dev_id;
1610         struct gfar_private *priv = netdev_priv(dev);
1611
1612         /* Save ievent for future reference */
1613         u32 events = gfar_read(&priv->regs->ievent);
1614
1615         /* Check for reception */
1616         if (events & IEVENT_RX_MASK)
1617                 gfar_receive(irq, dev_id);
1618
1619         /* Check for transmit completion */
1620         if (events & IEVENT_TX_MASK)
1621                 gfar_transmit(irq, dev_id);
1622
1623         /* Check for errors */
1624         if (events & IEVENT_ERR_MASK)
1625                 gfar_error(irq, dev_id);
1626
1627         return IRQ_HANDLED;
1628 }
1629
1630 /* Called every time the controller might need to be made
1631  * aware of new link state.  The PHY code conveys this
1632  * information through variables in the phydev structure, and this
1633  * function converts those variables into the appropriate
1634  * register values, and can bring down the device if needed.
1635  */
1636 static void adjust_link(struct net_device *dev)
1637 {
1638         struct gfar_private *priv = netdev_priv(dev);
1639         struct gfar __iomem *regs = priv->regs;
1640         unsigned long flags;
1641         struct phy_device *phydev = priv->phydev;
1642         int new_state = 0;
1643
1644         spin_lock_irqsave(&priv->txlock, flags);
1645         if (phydev->link) {
1646                 u32 tempval = gfar_read(&regs->maccfg2);
1647                 u32 ecntrl = gfar_read(&regs->ecntrl);
1648
1649                 /* Now we make sure that we can be in full duplex mode.
1650                  * If not, we operate in half-duplex mode. */
1651                 if (phydev->duplex != priv->oldduplex) {
1652                         new_state = 1;
1653                         if (!(phydev->duplex))
1654                                 tempval &= ~(MACCFG2_FULL_DUPLEX);
1655                         else
1656                                 tempval |= MACCFG2_FULL_DUPLEX;
1657
1658                         priv->oldduplex = phydev->duplex;
1659                 }
1660
1661                 if (phydev->speed != priv->oldspeed) {
1662                         new_state = 1;
1663                         switch (phydev->speed) {
1664                         case 1000:
1665                                 tempval =
1666                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_GMII);
1667                                 break;
1668                         case 100:
1669                         case 10:
1670                                 tempval =
1671                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_MII);
1672
1673                                 /* Reduced mode distinguishes
1674                                  * between 10 and 100 */
1675                                 if (phydev->speed == SPEED_100)
1676                                         ecntrl |= ECNTRL_R100;
1677                                 else
1678                                         ecntrl &= ~(ECNTRL_R100);
1679                                 break;
1680                         default:
1681                                 if (netif_msg_link(priv))
1682                                         printk(KERN_WARNING
1683                                                 "%s: Ack!  Speed (%d) is not 10/100/1000!\n",
1684                                                 dev->name, phydev->speed);
1685                                 break;
1686                         }
1687
1688                         priv->oldspeed = phydev->speed;
1689                 }
1690
1691                 gfar_write(&regs->maccfg2, tempval);
1692                 gfar_write(&regs->ecntrl, ecntrl);
1693
1694                 if (!priv->oldlink) {
1695                         new_state = 1;
1696                         priv->oldlink = 1;
1697                         netif_schedule(dev);
1698                 }
1699         } else if (priv->oldlink) {
1700                 new_state = 1;
1701                 priv->oldlink = 0;
1702                 priv->oldspeed = 0;
1703                 priv->oldduplex = -1;
1704         }
1705
1706         if (new_state && netif_msg_link(priv))
1707                 phy_print_status(phydev);
1708
1709         spin_unlock_irqrestore(&priv->txlock, flags);
1710 }
1711
1712 /* Update the hash table based on the current list of multicast
1713  * addresses we subscribe to.  Also, change the promiscuity of
1714  * the device based on the flags (this function is called
1715  * whenever dev->flags is changed */
1716 static void gfar_set_multi(struct net_device *dev)
1717 {
1718         struct dev_mc_list *mc_ptr;
1719         struct gfar_private *priv = netdev_priv(dev);
1720         struct gfar __iomem *regs = priv->regs;
1721         u32 tempval;
1722
1723         if(dev->flags & IFF_PROMISC) {
1724                 /* Set RCTRL to PROM */
1725                 tempval = gfar_read(&regs->rctrl);
1726                 tempval |= RCTRL_PROM;
1727                 gfar_write(&regs->rctrl, tempval);
1728         } else {
1729                 /* Set RCTRL to not PROM */
1730                 tempval = gfar_read(&regs->rctrl);
1731                 tempval &= ~(RCTRL_PROM);
1732                 gfar_write(&regs->rctrl, tempval);
1733         }
1734
1735         if(dev->flags & IFF_ALLMULTI) {
1736                 /* Set the hash to rx all multicast frames */
1737                 gfar_write(&regs->igaddr0, 0xffffffff);
1738                 gfar_write(&regs->igaddr1, 0xffffffff);
1739                 gfar_write(&regs->igaddr2, 0xffffffff);
1740                 gfar_write(&regs->igaddr3, 0xffffffff);
1741                 gfar_write(&regs->igaddr4, 0xffffffff);
1742                 gfar_write(&regs->igaddr5, 0xffffffff);
1743                 gfar_write(&regs->igaddr6, 0xffffffff);
1744                 gfar_write(&regs->igaddr7, 0xffffffff);
1745                 gfar_write(&regs->gaddr0, 0xffffffff);
1746                 gfar_write(&regs->gaddr1, 0xffffffff);
1747                 gfar_write(&regs->gaddr2, 0xffffffff);
1748                 gfar_write(&regs->gaddr3, 0xffffffff);
1749                 gfar_write(&regs->gaddr4, 0xffffffff);
1750                 gfar_write(&regs->gaddr5, 0xffffffff);
1751                 gfar_write(&regs->gaddr6, 0xffffffff);
1752                 gfar_write(&regs->gaddr7, 0xffffffff);
1753         } else {
1754                 int em_num;
1755                 int idx;
1756
1757                 /* zero out the hash */
1758                 gfar_write(&regs->igaddr0, 0x0);
1759                 gfar_write(&regs->igaddr1, 0x0);
1760                 gfar_write(&regs->igaddr2, 0x0);
1761                 gfar_write(&regs->igaddr3, 0x0);
1762                 gfar_write(&regs->igaddr4, 0x0);
1763                 gfar_write(&regs->igaddr5, 0x0);
1764                 gfar_write(&regs->igaddr6, 0x0);
1765                 gfar_write(&regs->igaddr7, 0x0);
1766                 gfar_write(&regs->gaddr0, 0x0);
1767                 gfar_write(&regs->gaddr1, 0x0);
1768                 gfar_write(&regs->gaddr2, 0x0);
1769                 gfar_write(&regs->gaddr3, 0x0);
1770                 gfar_write(&regs->gaddr4, 0x0);
1771                 gfar_write(&regs->gaddr5, 0x0);
1772                 gfar_write(&regs->gaddr6, 0x0);
1773                 gfar_write(&regs->gaddr7, 0x0);
1774
1775                 /* If we have extended hash tables, we need to
1776                  * clear the exact match registers to prepare for
1777                  * setting them */
1778                 if (priv->extended_hash) {
1779                         em_num = GFAR_EM_NUM + 1;
1780                         gfar_clear_exact_match(dev);
1781                         idx = 1;
1782                 } else {
1783                         idx = 0;
1784                         em_num = 0;
1785                 }
1786
1787                 if(dev->mc_count == 0)
1788                         return;
1789
1790                 /* Parse the list, and set the appropriate bits */
1791                 for(mc_ptr = dev->mc_list; mc_ptr; mc_ptr = mc_ptr->next) {
1792                         if (idx < em_num) {
1793                                 gfar_set_mac_for_addr(dev, idx,
1794                                                 mc_ptr->dmi_addr);
1795                                 idx++;
1796                         } else
1797                                 gfar_set_hash_for_addr(dev, mc_ptr->dmi_addr);
1798                 }
1799         }
1800
1801         return;
1802 }
1803
1804
1805 /* Clears each of the exact match registers to zero, so they
1806  * don't interfere with normal reception */
1807 static void gfar_clear_exact_match(struct net_device *dev)
1808 {
1809         int idx;
1810         u8 zero_arr[MAC_ADDR_LEN] = {0,0,0,0,0,0};
1811
1812         for(idx = 1;idx < GFAR_EM_NUM + 1;idx++)
1813                 gfar_set_mac_for_addr(dev, idx, (u8 *)zero_arr);
1814 }
1815
1816 /* Set the appropriate hash bit for the given addr */
1817 /* The algorithm works like so:
1818  * 1) Take the Destination Address (ie the multicast address), and
1819  * do a CRC on it (little endian), and reverse the bits of the
1820  * result.
1821  * 2) Use the 8 most significant bits as a hash into a 256-entry
1822  * table.  The table is controlled through 8 32-bit registers:
1823  * gaddr0-7.  gaddr0's MSB is entry 0, and gaddr7's LSB is
1824  * gaddr7.  This means that the 3 most significant bits in the
1825  * hash index which gaddr register to use, and the 5 other bits
1826  * indicate which bit (assuming an IBM numbering scheme, which
1827  * for PowerPC (tm) is usually the case) in the register holds
1828  * the entry. */
1829 static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr)
1830 {
1831         u32 tempval;
1832         struct gfar_private *priv = netdev_priv(dev);
1833         u32 result = ether_crc(MAC_ADDR_LEN, addr);
1834         int width = priv->hash_width;
1835         u8 whichbit = (result >> (32 - width)) & 0x1f;
1836         u8 whichreg = result >> (32 - width + 5);
1837         u32 value = (1 << (31-whichbit));
1838
1839         tempval = gfar_read(priv->hash_regs[whichreg]);
1840         tempval |= value;
1841         gfar_write(priv->hash_regs[whichreg], tempval);
1842
1843         return;
1844 }
1845
1846
1847 /* There are multiple MAC Address register pairs on some controllers
1848  * This function sets the numth pair to a given address
1849  */
1850 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr)
1851 {
1852         struct gfar_private *priv = netdev_priv(dev);
1853         int idx;
1854         char tmpbuf[MAC_ADDR_LEN];
1855         u32 tempval;
1856         u32 __iomem *macptr = &priv->regs->macstnaddr1;
1857
1858         macptr += num*2;
1859
1860         /* Now copy it into the mac registers backwards, cuz */
1861         /* little endian is silly */
1862         for (idx = 0; idx < MAC_ADDR_LEN; idx++)
1863                 tmpbuf[MAC_ADDR_LEN - 1 - idx] = addr[idx];
1864
1865         gfar_write(macptr, *((u32 *) (tmpbuf)));
1866
1867         tempval = *((u32 *) (tmpbuf + 4));
1868
1869         gfar_write(macptr+1, tempval);
1870 }
1871
1872 /* GFAR error interrupt handler */
1873 static irqreturn_t gfar_error(int irq, void *dev_id)
1874 {
1875         struct net_device *dev = dev_id;
1876         struct gfar_private *priv = netdev_priv(dev);
1877
1878         /* Save ievent for future reference */
1879         u32 events = gfar_read(&priv->regs->ievent);
1880
1881         /* Clear IEVENT */
1882         gfar_write(&priv->regs->ievent, IEVENT_ERR_MASK);
1883
1884         /* Hmm... */
1885         if (netif_msg_rx_err(priv) || netif_msg_tx_err(priv))
1886                 printk(KERN_DEBUG "%s: error interrupt (ievent=0x%08x imask=0x%08x)\n",
1887                        dev->name, events, gfar_read(&priv->regs->imask));
1888
1889         /* Update the error counters */
1890         if (events & IEVENT_TXE) {
1891                 priv->stats.tx_errors++;
1892
1893                 if (events & IEVENT_LC)
1894                         priv->stats.tx_window_errors++;
1895                 if (events & IEVENT_CRL)
1896                         priv->stats.tx_aborted_errors++;
1897                 if (events & IEVENT_XFUN) {
1898                         if (netif_msg_tx_err(priv))
1899                                 printk(KERN_DEBUG "%s: TX FIFO underrun, "
1900                                        "packet dropped.\n", dev->name);
1901                         priv->stats.tx_dropped++;
1902                         priv->extra_stats.tx_underrun++;
1903
1904                         /* Reactivate the Tx Queues */
1905                         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
1906                 }
1907                 if (netif_msg_tx_err(priv))
1908                         printk(KERN_DEBUG "%s: Transmit Error\n", dev->name);
1909         }
1910         if (events & IEVENT_BSY) {
1911                 priv->stats.rx_errors++;
1912                 priv->extra_stats.rx_bsy++;
1913
1914                 gfar_receive(irq, dev_id);
1915
1916 #ifndef CONFIG_GFAR_NAPI
1917                 /* Clear the halt bit in RSTAT */
1918                 gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
1919 #endif
1920
1921                 if (netif_msg_rx_err(priv))
1922                         printk(KERN_DEBUG "%s: busy error (rstat: %x)\n",
1923                                dev->name, gfar_read(&priv->regs->rstat));
1924         }
1925         if (events & IEVENT_BABR) {
1926                 priv->stats.rx_errors++;
1927                 priv->extra_stats.rx_babr++;
1928
1929                 if (netif_msg_rx_err(priv))
1930                         printk(KERN_DEBUG "%s: babbling RX error\n", dev->name);
1931         }
1932         if (events & IEVENT_EBERR) {
1933                 priv->extra_stats.eberr++;
1934                 if (netif_msg_rx_err(priv))
1935                         printk(KERN_DEBUG "%s: bus error\n", dev->name);
1936         }
1937         if ((events & IEVENT_RXC) && netif_msg_rx_status(priv))
1938                 printk(KERN_DEBUG "%s: control frame\n", dev->name);
1939
1940         if (events & IEVENT_BABT) {
1941                 priv->extra_stats.tx_babt++;
1942                 if (netif_msg_tx_err(priv))
1943                         printk(KERN_DEBUG "%s: babbling TX error\n", dev->name);
1944         }
1945         return IRQ_HANDLED;
1946 }
1947
1948 /* Structure for a device driver */
1949 static struct platform_driver gfar_driver = {
1950         .probe = gfar_probe,
1951         .remove = gfar_remove,
1952         .driver = {
1953                 .name = "fsl-gianfar",
1954         },
1955 };
1956
1957 static int __init gfar_init(void)
1958 {
1959         int err = gfar_mdio_init();
1960
1961         if (err)
1962                 return err;
1963
1964         err = platform_driver_register(&gfar_driver);
1965
1966         if (err)
1967                 gfar_mdio_exit();
1968
1969         return err;
1970 }
1971
1972 static void __exit gfar_exit(void)
1973 {
1974         platform_driver_unregister(&gfar_driver);
1975         gfar_mdio_exit();
1976 }
1977
1978 module_init(gfar_init);
1979 module_exit(gfar_exit);
1980