drivers/net/gianfar.c

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