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.  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 static void gfar_configure_serdes(struct net_device *dev);
 134 extern int gfar_local_mdio_write(struct gfar_mii *regs, int mii_id, int regnum, u16 value);
 135 extern int gfar_local_mdio_read(struct gfar_mii *regs, int mii_id, int regnum);
 136 #ifdef CONFIG_GFAR_NAPI
 137 static int gfar_poll(struct napi_struct *napi, int budget);
 138 #endif
 139 #ifdef CONFIG_NET_POLL_CONTROLLER
 140 static void gfar_netpoll(struct net_device *dev);
 141 #endif
 142 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit);
 143 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb, int length);
 144 static void gfar_vlan_rx_register(struct net_device *netdev,
 145                                 struct vlan_group *grp);
 146 void gfar_halt(struct net_device *dev);
 147 void gfar_start(struct net_device *dev);
 148 static void gfar_clear_exact_match(struct net_device *dev);
 149 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr);
 150
 151 extern const struct ethtool_ops gfar_ethtool_ops;
 152
 153 MODULE_AUTHOR("Freescale Semiconductor, Inc");
 154 MODULE_DESCRIPTION("Gianfar Ethernet Driver");
 155 MODULE_LICENSE("GPL");
 156
 157 /* Returns 1 if incoming frames use an FCB */
 158 static inline int gfar_uses_fcb(struct gfar_private *priv)
 159 {
 160         return (priv->vlan_enable || priv->rx_csum_enable);
 161 }
 162
 163 /* Set up the ethernet device structure, private data,
 164  * and anything else we need before we start */
 165 static int gfar_probe(struct platform_device *pdev)
 166 {
 167         u32 tempval;
 168         struct net_device *dev = NULL;
 169         struct gfar_private *priv = NULL;
 170         struct gianfar_platform_data *einfo;
 171         struct resource *r;
 172         int idx;
 173         int err = 0;
 174
 175         einfo = (struct gianfar_platform_data *) pdev->dev.platform_data;
 176
 177         if (NULL == einfo) {
 178                 printk(KERN_ERR "gfar %d: Missing additional data!\n",
 179                        pdev->id);
 180
 181                 return -ENODEV;
 182         }
 183
 184         /* Create an ethernet device instance */
 185         dev = alloc_etherdev(sizeof (*priv));
 186
 187         if (NULL == dev)
 188                 return -ENOMEM;
 189
 190         priv = netdev_priv(dev);
 191         priv->dev = dev;
 192
 193         /* Set the info in the priv to the current info */
 194         priv->einfo = einfo;
 195
 196         /* fill out IRQ fields */
 197         if (einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 198                 priv->interruptTransmit = platform_get_irq_byname(pdev, "tx");
 199                 priv->interruptReceive = platform_get_irq_byname(pdev, "rx");
 200                 priv->interruptError = platform_get_irq_byname(pdev, "error");
 201                 if (priv->interruptTransmit < 0 || priv->interruptReceive < 0 || priv->interruptError < 0)
 202                         goto regs_fail;
 203         } else {
 204                 priv->interruptTransmit = platform_get_irq(pdev, 0);
 205                 if (priv->interruptTransmit < 0)
 206                         goto regs_fail;
 207         }
 208
 209         /* get a pointer to the register memory */
 210         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 211         priv->regs = ioremap(r->start, sizeof (struct gfar));
 212
 213         if (NULL == priv->regs) {
 214                 err = -ENOMEM;
 215                 goto regs_fail;
 216         }
 217
 218         spin_lock_init(&priv->txlock);
 219         spin_lock_init(&priv->rxlock);
 220
 221         platform_set_drvdata(pdev, dev);
 222
 223         /* Stop the DMA engine now, in case it was running before */
 224         /* (The firmware could have used it, and left it running). */
 225         /* To do this, we write Graceful Receive Stop and Graceful */
 226         /* Transmit Stop, and then wait until the corresponding bits */
 227         /* in IEVENT indicate the stops have completed. */
 228         tempval = gfar_read(&priv->regs->dmactrl);
 229         tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
 230         gfar_write(&priv->regs->dmactrl, tempval);
 231
 232         tempval = gfar_read(&priv->regs->dmactrl);
 233         tempval |= (DMACTRL_GRS | DMACTRL_GTS);
 234         gfar_write(&priv->regs->dmactrl, tempval);
 235
 236         while (!(gfar_read(&priv->regs->ievent) & (IEVENT_GRSC | IEVENT_GTSC)))
 237                 cpu_relax();
 238
 239         /* Reset MAC layer */
 240         gfar_write(&priv->regs->maccfg1, MACCFG1_SOFT_RESET);
 241
 242         tempval = (MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
 243         gfar_write(&priv->regs->maccfg1, tempval);
 244
 245         /* Initialize MACCFG2. */
 246         gfar_write(&priv->regs->maccfg2, MACCFG2_INIT_SETTINGS);
 247
 248         /* Initialize ECNTRL */
 249         gfar_write(&priv->regs->ecntrl, ECNTRL_INIT_SETTINGS);
 250
 251         /* Copy the station address into the dev structure, */
 252         memcpy(dev->dev_addr, einfo->mac_addr, MAC_ADDR_LEN);
 253
 254         /* Set the dev->base_addr to the gfar reg region */
 255         dev->base_addr = (unsigned long) (priv->regs);
 256
 257         SET_MODULE_OWNER(dev);
 258         SET_NETDEV_DEV(dev, &pdev->dev);
 259
 260         /* Fill in the dev structure */
 261         dev->open = gfar_enet_open;
 262         dev->hard_start_xmit = gfar_start_xmit;
 263         dev->tx_timeout = gfar_timeout;
 264         dev->watchdog_timeo = TX_TIMEOUT;
 265         netif_napi_add(dev, &priv->napi, gfar_poll, GFAR_DEV_WEIGHT);
 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
 288                 dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
 289
 290                 priv->vlan_enable = 1;
 291         }
 292
 293         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_EXTENDED_HASH) {
 294                 priv->extended_hash = 1;
 295                 priv->hash_width = 9;
 296
 297                 priv->hash_regs[0] = &priv->regs->igaddr0;
 298                 priv->hash_regs[1] = &priv->regs->igaddr1;
 299                 priv->hash_regs[2] = &priv->regs->igaddr2;
 300                 priv->hash_regs[3] = &priv->regs->igaddr3;
 301                 priv->hash_regs[4] = &priv->regs->igaddr4;
 302                 priv->hash_regs[5] = &priv->regs->igaddr5;
 303                 priv->hash_regs[6] = &priv->regs->igaddr6;
 304                 priv->hash_regs[7] = &priv->regs->igaddr7;
 305                 priv->hash_regs[8] = &priv->regs->gaddr0;
 306                 priv->hash_regs[9] = &priv->regs->gaddr1;
 307                 priv->hash_regs[10] = &priv->regs->gaddr2;
 308                 priv->hash_regs[11] = &priv->regs->gaddr3;
 309                 priv->hash_regs[12] = &priv->regs->gaddr4;
 310                 priv->hash_regs[13] = &priv->regs->gaddr5;
 311                 priv->hash_regs[14] = &priv->regs->gaddr6;
 312                 priv->hash_regs[15] = &priv->regs->gaddr7;
 313
 314         } else {
 315                 priv->extended_hash = 0;
 316                 priv->hash_width = 8;
 317
 318                 priv->hash_regs[0] = &priv->regs->gaddr0;
 319                 priv->hash_regs[1] = &priv->regs->gaddr1;
 320                 priv->hash_regs[2] = &priv->regs->gaddr2;
 321                 priv->hash_regs[3] = &priv->regs->gaddr3;
 322                 priv->hash_regs[4] = &priv->regs->gaddr4;
 323                 priv->hash_regs[5] = &priv->regs->gaddr5;
 324                 priv->hash_regs[6] = &priv->regs->gaddr6;
 325                 priv->hash_regs[7] = &priv->regs->gaddr7;
 326         }
 327
 328         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_PADDING)
 329                 priv->padding = DEFAULT_PADDING;
 330         else
 331                 priv->padding = 0;
 332
 333         if (dev->features & NETIF_F_IP_CSUM)
 334                 dev->hard_header_len += GMAC_FCB_LEN;
 335
 336         priv->rx_buffer_size = DEFAULT_RX_BUFFER_SIZE;
 337         priv->tx_ring_size = DEFAULT_TX_RING_SIZE;
 338         priv->rx_ring_size = DEFAULT_RX_RING_SIZE;
 339
 340         priv->txcoalescing = DEFAULT_TX_COALESCE;
 341         priv->txcount = DEFAULT_TXCOUNT;
 342         priv->txtime = DEFAULT_TXTIME;
 343         priv->rxcoalescing = DEFAULT_RX_COALESCE;
 344         priv->rxcount = DEFAULT_RXCOUNT;
 345         priv->rxtime = DEFAULT_RXTIME;
 346
 347         /* Enable most messages by default */
 348         priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
 349
 350         err = register_netdev(dev);
 351
 352         if (err) {
 353                 printk(KERN_ERR "%s: Cannot register net device, aborting.\n",
 354                                 dev->name);
 355                 goto register_fail;
 356         }
 357
 358         /* Create all the sysfs files */
 359         gfar_init_sysfs(dev);
 360
 361         /* Print out the device info */
 362         printk(KERN_INFO DEVICE_NAME, dev->name);
 363         for (idx = 0; idx < 6; idx++)
 364                 printk("%2.2x%c", dev->dev_addr[idx], idx == 5 ? ' ' : ':');
 365         printk("\n");
 366
 367         /* Even more device info helps when determining which kernel */
 368         /* provided which set of benchmarks. */
 369 #ifdef CONFIG_GFAR_NAPI
 370         printk(KERN_INFO "%s: Running with NAPI enabled\n", dev->name);
 371 #else
 372         printk(KERN_INFO "%s: Running with NAPI disabled\n", dev->name);
 373 #endif
 374         printk(KERN_INFO "%s: %d/%d RX/TX BD ring size\n",
 375                dev->name, priv->rx_ring_size, priv->tx_ring_size);
 376
 377         return 0;
 378
 379 register_fail:
 380         iounmap(priv->regs);
 381 regs_fail:
 382         free_netdev(dev);
 383         return err;
 384 }
 385
 386 static int gfar_remove(struct platform_device *pdev)
 387 {
 388         struct net_device *dev = platform_get_drvdata(pdev);
 389         struct gfar_private *priv = netdev_priv(dev);
 390
 391         platform_set_drvdata(pdev, NULL);
 392
 393         iounmap(priv->regs);
 394         free_netdev(dev);
 395
 396         return 0;
 397 }
 398
 399
 400 /* Reads the controller's registers to determine what interface
 401  * connects it to the PHY.
 402  */
 403 static phy_interface_t gfar_get_interface(struct net_device *dev)
 404 {
 405         struct gfar_private *priv = netdev_priv(dev);
 406         u32 ecntrl = gfar_read(&priv->regs->ecntrl);
 407
 408         if (ecntrl & ECNTRL_SGMII_MODE)
 409                 return PHY_INTERFACE_MODE_SGMII;
 410
 411         if (ecntrl & ECNTRL_TBI_MODE) {
 412                 if (ecntrl & ECNTRL_REDUCED_MODE)
 413                         return PHY_INTERFACE_MODE_RTBI;
 414                 else
 415                         return PHY_INTERFACE_MODE_TBI;
 416         }
 417
 418         if (ecntrl & ECNTRL_REDUCED_MODE) {
 419                 if (ecntrl & ECNTRL_REDUCED_MII_MODE)
 420                         return PHY_INTERFACE_MODE_RMII;
 421                 else {
 422                         phy_interface_t interface = priv->einfo->interface;
 423
 424                         /*
 425                          * This isn't autodetected right now, so it must
 426                          * be set by the device tree or platform code.
 427                          */
 428                         if (interface == PHY_INTERFACE_MODE_RGMII_ID)
 429                                 return PHY_INTERFACE_MODE_RGMII_ID;
 430
 431                         return PHY_INTERFACE_MODE_RGMII;
 432                 }
 433         }
 434
 435         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT)
 436                 return PHY_INTERFACE_MODE_GMII;
 437
 438         return PHY_INTERFACE_MODE_MII;
 439 }
 440
 441
 442 /* Initializes driver's PHY state, and attaches to the PHY.
 443  * Returns 0 on success.
 444  */
 445 static int init_phy(struct net_device *dev)
 446 {
 447         struct gfar_private *priv = netdev_priv(dev);
 448         uint gigabit_support =
 449                 priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT ?
 450                 SUPPORTED_1000baseT_Full : 0;
 451         struct phy_device *phydev;
 452         char phy_id[BUS_ID_SIZE];
 453         phy_interface_t interface;
 454
 455         priv->oldlink = 0;
 456         priv->oldspeed = 0;
 457         priv->oldduplex = -1;
 458
 459         snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT, priv->einfo->bus_id, priv->einfo->phy_id);
 460
 461         interface = gfar_get_interface(dev);
 462
 463         phydev = phy_connect(dev, phy_id, &adjust_link, 0, interface);
 464
 465         if (interface == PHY_INTERFACE_MODE_SGMII)
 466                 gfar_configure_serdes(dev);
 467
 468         if (IS_ERR(phydev)) {
 469                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 470                 return PTR_ERR(phydev);
 471         }
 472
 473         /* Remove any features not supported by the controller */
 474         phydev->supported &= (GFAR_SUPPORTED | gigabit_support);
 475         phydev->advertising = phydev->supported;
 476
 477         priv->phydev = phydev;
 478
 479         return 0;
 480 }
 481
 482 static void gfar_configure_serdes(struct net_device *dev)
 483 {
 484         struct gfar_private *priv = netdev_priv(dev);
 485         struct gfar_mii __iomem *regs =
 486                         (void __iomem *)&priv->regs->gfar_mii_regs;
 487
 488         /* Initialise TBI i/f to communicate with serdes (lynx phy) */
 489
 490         /* Single clk mode, mii mode off(for aerdes communication) */
 491         gfar_local_mdio_write(regs, TBIPA_VALUE, MII_TBICON, TBICON_CLK_SELECT);
 492
 493         /* Supported pause and full-duplex, no half-duplex */
 494         gfar_local_mdio_write(regs, TBIPA_VALUE, MII_ADVERTISE,
 495                         ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
 496                         ADVERTISE_1000XPSE_ASYM);
 497
 498         /* ANEG enable, restart ANEG, full duplex mode, speed[1] set */
 499         gfar_local_mdio_write(regs, TBIPA_VALUE, MII_BMCR, BMCR_ANENABLE |
 500                         BMCR_ANRESTART | BMCR_FULLDPLX | BMCR_SPEED1000);
 501 }
 502
 503 static void init_registers(struct net_device *dev)
 504 {
 505         struct gfar_private *priv = netdev_priv(dev);
 506
 507         /* Clear IEVENT */
 508         gfar_write(&priv->regs->ievent, IEVENT_INIT_CLEAR);
 509
 510         /* Initialize IMASK */
 511         gfar_write(&priv->regs->imask, IMASK_INIT_CLEAR);
 512
 513         /* Init hash registers to zero */
 514         gfar_write(&priv->regs->igaddr0, 0);
 515         gfar_write(&priv->regs->igaddr1, 0);
 516         gfar_write(&priv->regs->igaddr2, 0);
 517         gfar_write(&priv->regs->igaddr3, 0);
 518         gfar_write(&priv->regs->igaddr4, 0);
 519         gfar_write(&priv->regs->igaddr5, 0);
 520         gfar_write(&priv->regs->igaddr6, 0);
 521         gfar_write(&priv->regs->igaddr7, 0);
 522
 523         gfar_write(&priv->regs->gaddr0, 0);
 524         gfar_write(&priv->regs->gaddr1, 0);
 525         gfar_write(&priv->regs->gaddr2, 0);
 526         gfar_write(&priv->regs->gaddr3, 0);
 527         gfar_write(&priv->regs->gaddr4, 0);
 528         gfar_write(&priv->regs->gaddr5, 0);
 529         gfar_write(&priv->regs->gaddr6, 0);
 530         gfar_write(&priv->regs->gaddr7, 0);
 531
 532         /* Zero out the rmon mib registers if it has them */
 533         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
 534                 memset_io(&(priv->regs->rmon), 0, sizeof (struct rmon_mib));
 535
 536                 /* Mask off the CAM interrupts */
 537                 gfar_write(&priv->regs->rmon.cam1, 0xffffffff);
 538                 gfar_write(&priv->regs->rmon.cam2, 0xffffffff);
 539         }
 540
 541         /* Initialize the max receive buffer length */
 542         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
 543
 544         /* Initialize the Minimum Frame Length Register */
 545         gfar_write(&priv->regs->minflr, MINFLR_INIT_SETTINGS);
 546
 547         /* Assign the TBI an address which won't conflict with the PHYs */
 548         gfar_write(&priv->regs->tbipa, TBIPA_VALUE);
 549 }
 550
 551
 552 /* Halt the receive and transmit queues */
 553 void gfar_halt(struct net_device *dev)
 554 {
 555         struct gfar_private *priv = netdev_priv(dev);
 556         struct gfar __iomem *regs = priv->regs;
 557         u32 tempval;
 558
 559         /* Mask all interrupts */
 560         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 561
 562         /* Clear all interrupts */
 563         gfar_write(&regs->ievent, IEVENT_INIT_CLEAR);
 564
 565         /* Stop the DMA, and wait for it to stop */
 566         tempval = gfar_read(&priv->regs->dmactrl);
 567         if ((tempval & (DMACTRL_GRS | DMACTRL_GTS))
 568             != (DMACTRL_GRS | DMACTRL_GTS)) {
 569                 tempval |= (DMACTRL_GRS | DMACTRL_GTS);
 570                 gfar_write(&priv->regs->dmactrl, tempval);
 571
 572                 while (!(gfar_read(&priv->regs->ievent) &
 573                          (IEVENT_GRSC | IEVENT_GTSC)))
 574                         cpu_relax();
 575         }
 576
 577         /* Disable Rx and Tx */
 578         tempval = gfar_read(&regs->maccfg1);
 579         tempval &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
 580         gfar_write(&regs->maccfg1, tempval);
 581 }
 582
 583 void stop_gfar(struct net_device *dev)
 584 {
 585         struct gfar_private *priv = netdev_priv(dev);
 586         struct gfar __iomem *regs = priv->regs;
 587         unsigned long flags;
 588
 589         phy_stop(priv->phydev);
 590
 591         /* Lock it down */
 592         spin_lock_irqsave(&priv->txlock, flags);
 593         spin_lock(&priv->rxlock);
 594
 595         gfar_halt(dev);
 596
 597         spin_unlock(&priv->rxlock);
 598         spin_unlock_irqrestore(&priv->txlock, flags);
 599
 600         /* Free the IRQs */
 601         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 602                 free_irq(priv->interruptError, dev);
 603                 free_irq(priv->interruptTransmit, dev);
 604                 free_irq(priv->interruptReceive, dev);
 605         } else {
 606                 free_irq(priv->interruptTransmit, dev);
 607         }
 608
 609         free_skb_resources(priv);
 610
 611         dma_free_coherent(NULL,
 612                         sizeof(struct txbd8)*priv->tx_ring_size
 613                         + sizeof(struct rxbd8)*priv->rx_ring_size,
 614                         priv->tx_bd_base,
 615                         gfar_read(&regs->tbase0));
 616 }
 617
 618 /* If there are any tx skbs or rx skbs still around, free them.
 619  * Then free tx_skbuff and rx_skbuff */
 620 static void free_skb_resources(struct gfar_private *priv)
 621 {
 622         struct rxbd8 *rxbdp;
 623         struct txbd8 *txbdp;
 624         int i;
 625
 626         /* Go through all the buffer descriptors and free their data buffers */
 627         txbdp = priv->tx_bd_base;
 628
 629         for (i = 0; i < priv->tx_ring_size; i++) {
 630
 631                 if (priv->tx_skbuff[i]) {
 632                         dma_unmap_single(NULL, txbdp->bufPtr,
 633                                         txbdp->length,
 634                                         DMA_TO_DEVICE);
 635                         dev_kfree_skb_any(priv->tx_skbuff[i]);
 636                         priv->tx_skbuff[i] = NULL;
 637                 }
 638         }
 639
 640         kfree(priv->tx_skbuff);
 641
 642         rxbdp = priv->rx_bd_base;
 643
 644         /* rx_skbuff is not guaranteed to be allocated, so only
 645          * free it and its contents if it is allocated */
 646         if(priv->rx_skbuff != NULL) {
 647                 for (i = 0; i < priv->rx_ring_size; i++) {
 648                         if (priv->rx_skbuff[i]) {
 649                                 dma_unmap_single(NULL, rxbdp->bufPtr,
 650                                                 priv->rx_buffer_size,
 651                                                 DMA_FROM_DEVICE);
 652
 653                                 dev_kfree_skb_any(priv->rx_skbuff[i]);
 654                                 priv->rx_skbuff[i] = NULL;
 655                         }
 656
 657                         rxbdp->status = 0;
 658                         rxbdp->length = 0;
 659                         rxbdp->bufPtr = 0;
 660
 661                         rxbdp++;
 662                 }
 663
 664                 kfree(priv->rx_skbuff);
 665         }
 666 }
 667
 668 void gfar_start(struct net_device *dev)
 669 {
 670         struct gfar_private *priv = netdev_priv(dev);
 671         struct gfar __iomem *regs = priv->regs;
 672         u32 tempval;
 673
 674         /* Enable Rx and Tx in MACCFG1 */
 675         tempval = gfar_read(&regs->maccfg1);
 676         tempval |= (MACCFG1_RX_EN | MACCFG1_TX_EN);
 677         gfar_write(&regs->maccfg1, tempval);
 678
 679         /* Initialize DMACTRL to have WWR and WOP */
 680         tempval = gfar_read(&priv->regs->dmactrl);
 681         tempval |= DMACTRL_INIT_SETTINGS;
 682         gfar_write(&priv->regs->dmactrl, tempval);
 683
 684         /* Make sure we aren't stopped */
 685         tempval = gfar_read(&priv->regs->dmactrl);
 686         tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
 687         gfar_write(&priv->regs->dmactrl, tempval);
 688
 689         /* Clear THLT/RHLT, so that the DMA starts polling now */
 690         gfar_write(&regs->tstat, TSTAT_CLEAR_THALT);
 691         gfar_write(&regs->rstat, RSTAT_CLEAR_RHALT);
 692
 693         /* Unmask the interrupts we look for */
 694         gfar_write(&regs->imask, IMASK_DEFAULT);
 695 }
 696
 697 /* Bring the controller up and running */
 698 int startup_gfar(struct net_device *dev)
 699 {
 700         struct txbd8 *txbdp;
 701         struct rxbd8 *rxbdp;
 702         dma_addr_t addr;
 703         unsigned long vaddr;
 704         int i;
 705         struct gfar_private *priv = netdev_priv(dev);
 706         struct gfar __iomem *regs = priv->regs;
 707         int err = 0;
 708         u32 rctrl = 0;
 709         u32 attrs = 0;
 710
 711         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 712
 713         /* Allocate memory for the buffer descriptors */
 714         vaddr = (unsigned long) dma_alloc_coherent(NULL,
 715                         sizeof (struct txbd8) * priv->tx_ring_size +
 716                         sizeof (struct rxbd8) * priv->rx_ring_size,
 717                         &addr, GFP_KERNEL);
 718
 719         if (vaddr == 0) {
 720                 if (netif_msg_ifup(priv))
 721                         printk(KERN_ERR "%s: Could not allocate buffer descriptors!\n",
 722                                         dev->name);
 723                 return -ENOMEM;
 724         }
 725
 726         priv->tx_bd_base = (struct txbd8 *) vaddr;
 727
 728         /* enet DMA only understands physical addresses */
 729         gfar_write(&regs->tbase0, addr);
 730
 731         /* Start the rx descriptor ring where the tx ring leaves off */
 732         addr = addr + sizeof (struct txbd8) * priv->tx_ring_size;
 733         vaddr = vaddr + sizeof (struct txbd8) * priv->tx_ring_size;
 734         priv->rx_bd_base = (struct rxbd8 *) vaddr;
 735         gfar_write(&regs->rbase0, addr);
 736
 737         /* Setup the skbuff rings */
 738         priv->tx_skbuff =
 739             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 740                                         priv->tx_ring_size, GFP_KERNEL);
 741
 742         if (NULL == priv->tx_skbuff) {
 743                 if (netif_msg_ifup(priv))
 744                         printk(KERN_ERR "%s: Could not allocate tx_skbuff\n",
 745                                         dev->name);
 746                 err = -ENOMEM;
 747                 goto tx_skb_fail;
 748         }
 749
 750         for (i = 0; i < priv->tx_ring_size; i++)
 751                 priv->tx_skbuff[i] = NULL;
 752
 753         priv->rx_skbuff =
 754             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 755                                         priv->rx_ring_size, GFP_KERNEL);
 756
 757         if (NULL == priv->rx_skbuff) {
 758                 if (netif_msg_ifup(priv))
 759                         printk(KERN_ERR "%s: Could not allocate rx_skbuff\n",
 760                                         dev->name);
 761                 err = -ENOMEM;
 762                 goto rx_skb_fail;
 763         }
 764
 765         for (i = 0; i < priv->rx_ring_size; i++)
 766                 priv->rx_skbuff[i] = NULL;
 767
 768         /* Initialize some variables in our dev structure */
 769         priv->dirty_tx = priv->cur_tx = priv->tx_bd_base;
 770         priv->cur_rx = priv->rx_bd_base;
 771         priv->skb_curtx = priv->skb_dirtytx = 0;
 772         priv->skb_currx = 0;
 773
 774         /* Initialize Transmit Descriptor Ring */
 775         txbdp = priv->tx_bd_base;
 776         for (i = 0; i < priv->tx_ring_size; i++) {
 777                 txbdp->status = 0;
 778                 txbdp->length = 0;
 779                 txbdp->bufPtr = 0;
 780                 txbdp++;
 781         }
 782
 783         /* Set the last descriptor in the ring to indicate wrap */
 784         txbdp--;
 785         txbdp->status |= TXBD_WRAP;
 786
 787         rxbdp = priv->rx_bd_base;
 788         for (i = 0; i < priv->rx_ring_size; i++) {
 789                 struct sk_buff *skb = NULL;
 790
 791                 rxbdp->status = 0;
 792
 793                 skb = gfar_new_skb(dev, rxbdp);
 794
 795                 priv->rx_skbuff[i] = skb;
 796
 797                 rxbdp++;
 798         }
 799
 800         /* Set the last descriptor in the ring to wrap */
 801         rxbdp--;
 802         rxbdp->status |= RXBD_WRAP;
 803
 804         /* If the device has multiple interrupts, register for
 805          * them.  Otherwise, only register for the one */
 806         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 807                 /* Install our interrupt handlers for Error,
 808                  * Transmit, and Receive */
 809                 if (request_irq(priv->interruptError, gfar_error,
 810                                 0, "enet_error", dev) < 0) {
 811                         if (netif_msg_intr(priv))
 812                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
 813                                         dev->name, priv->interruptError);
 814
 815                         err = -1;
 816                         goto err_irq_fail;
 817                 }
 818
 819                 if (request_irq(priv->interruptTransmit, gfar_transmit,
 820                                 0, "enet_tx", dev) < 0) {
 821                         if (netif_msg_intr(priv))
 822                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
 823                                         dev->name, priv->interruptTransmit);
 824
 825                         err = -1;
 826
 827                         goto tx_irq_fail;
 828                 }
 829
 830                 if (request_irq(priv->interruptReceive, gfar_receive,
 831                                 0, "enet_rx", dev) < 0) {
 832                         if (netif_msg_intr(priv))
 833                                 printk(KERN_ERR "%s: Can't get IRQ %d (receive0)\n",
 834                                                 dev->name, priv->interruptReceive);
 835
 836                         err = -1;
 837                         goto rx_irq_fail;
 838                 }
 839         } else {
 840                 if (request_irq(priv->interruptTransmit, gfar_interrupt,
 841                                 0, "gfar_interrupt", dev) < 0) {
 842                         if (netif_msg_intr(priv))
 843                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
 844                                         dev->name, priv->interruptError);
 845
 846                         err = -1;
 847                         goto err_irq_fail;
 848                 }
 849         }
 850
 851         phy_start(priv->phydev);
 852
 853         /* Configure the coalescing support */
 854         if (priv->txcoalescing)
 855                 gfar_write(&regs->txic,
 856                            mk_ic_value(priv->txcount, priv->txtime));
 857         else
 858                 gfar_write(&regs->txic, 0);
 859
 860         if (priv->rxcoalescing)
 861                 gfar_write(&regs->rxic,
 862                            mk_ic_value(priv->rxcount, priv->rxtime));
 863         else
 864                 gfar_write(&regs->rxic, 0);
 865
 866         if (priv->rx_csum_enable)
 867                 rctrl |= RCTRL_CHECKSUMMING;
 868
 869         if (priv->extended_hash) {
 870                 rctrl |= RCTRL_EXTHASH;
 871
 872                 gfar_clear_exact_match(dev);
 873                 rctrl |= RCTRL_EMEN;
 874         }
 875
 876         if (priv->vlan_enable)
 877                 rctrl |= RCTRL_VLAN;
 878
 879         if (priv->padding) {
 880                 rctrl &= ~RCTRL_PAL_MASK;
 881                 rctrl |= RCTRL_PADDING(priv->padding);
 882         }
 883
 884         /* Init rctrl based on our settings */
 885         gfar_write(&priv->regs->rctrl, rctrl);
 886
 887         if (dev->features & NETIF_F_IP_CSUM)
 888                 gfar_write(&priv->regs->tctrl, TCTRL_INIT_CSUM);
 889
 890         /* Set the extraction length and index */
 891         attrs = ATTRELI_EL(priv->rx_stash_size) |
 892                 ATTRELI_EI(priv->rx_stash_index);
 893
 894         gfar_write(&priv->regs->attreli, attrs);
 895
 896         /* Start with defaults, and add stashing or locking
 897          * depending on the approprate variables */
 898         attrs = ATTR_INIT_SETTINGS;
 899
 900         if (priv->bd_stash_en)
 901                 attrs |= ATTR_BDSTASH;
 902
 903         if (priv->rx_stash_size != 0)
 904                 attrs |= ATTR_BUFSTASH;
 905
 906         gfar_write(&priv->regs->attr, attrs);
 907
 908         gfar_write(&priv->regs->fifo_tx_thr, priv->fifo_threshold);
 909         gfar_write(&priv->regs->fifo_tx_starve, priv->fifo_starve);
 910         gfar_write(&priv->regs->fifo_tx_starve_shutoff, priv->fifo_starve_off);
 911
 912         /* Start the controller */
 913         gfar_start(dev);
 914
 915         return 0;
 916
 917 rx_irq_fail:
 918         free_irq(priv->interruptTransmit, dev);
 919 tx_irq_fail:
 920         free_irq(priv->interruptError, dev);
 921 err_irq_fail:
 922 rx_skb_fail:
 923         free_skb_resources(priv);
 924 tx_skb_fail:
 925         dma_free_coherent(NULL,
 926                         sizeof(struct txbd8)*priv->tx_ring_size
 927                         + sizeof(struct rxbd8)*priv->rx_ring_size,
 928                         priv->tx_bd_base,
 929                         gfar_read(&regs->tbase0));
 930
 931         return err;
 932 }
 933
 934 /* Called when something needs to use the ethernet device */
 935 /* Returns 0 for success. */
 936 static int gfar_enet_open(struct net_device *dev)
 937 {
 938         int err;
 939
 940         napi_enable(&priv->napi);
 941
 942         /* Initialize a bunch of registers */
 943         init_registers(dev);
 944
 945         gfar_set_mac_address(dev);
 946
 947         err = init_phy(dev);
 948
 949         if(err) {
 950                 napi_disable(&priv->napi);
 951                 return err;
 952         }
 953
 954         err = startup_gfar(dev);
 955         if (err)
 956                 napi_disable(&priv->napi);
 957
 958         netif_start_queue(dev);
 959
 960         return err;
 961 }
 962
 963 static inline struct txfcb *gfar_add_fcb(struct sk_buff *skb, struct txbd8 *bdp)
 964 {
 965         struct txfcb *fcb = (struct txfcb *)skb_push (skb, GMAC_FCB_LEN);
 966
 967         memset(fcb, 0, GMAC_FCB_LEN);
 968
 969         return fcb;
 970 }
 971
 972 static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
 973 {
 974         u8 flags = 0;
 975
 976         /* If we're here, it's a IP packet with a TCP or UDP
 977          * payload.  We set it to checksum, using a pseudo-header
 978          * we provide
 979          */
 980         flags = TXFCB_DEFAULT;
 981
 982         /* Tell the controller what the protocol is */
 983         /* And provide the already calculated phcs */
 984         if (ip_hdr(skb)->protocol == IPPROTO_UDP) {
 985                 flags |= TXFCB_UDP;
 986                 fcb->phcs = udp_hdr(skb)->check;
 987         } else
 988                 fcb->phcs = tcp_hdr(skb)->check;
 989
 990         /* l3os is the distance between the start of the
 991          * frame (skb->data) and the start of the IP hdr.
 992          * l4os is the distance between the start of the
 993          * l3 hdr and the l4 hdr */
 994         fcb->l3os = (u16)(skb_network_offset(skb) - GMAC_FCB_LEN);
 995         fcb->l4os = skb_network_header_len(skb);
 996
 997         fcb->flags = flags;
 998 }
 999
1000 void inline gfar_tx_vlan(struct sk_buff *skb, struct txfcb *fcb)
1001 {
1002         fcb->flags |= TXFCB_VLN;
1003         fcb->vlctl = vlan_tx_tag_get(skb);
1004 }
1005
1006 /* This is called by the kernel when a frame is ready for transmission. */
1007 /* It is pointed to by the dev->hard_start_xmit function pointer */
1008 static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
1009 {
1010         struct gfar_private *priv = netdev_priv(dev);
1011         struct txfcb *fcb = NULL;
1012         struct txbd8 *txbdp;
1013         u16 status;
1014         unsigned long flags;
1015
1016         /* Update transmit stats */
1017         priv->stats.tx_bytes += skb->len;
1018
1019         /* Lock priv now */
1020         spin_lock_irqsave(&priv->txlock, flags);
1021
1022         /* Point at the first free tx descriptor */
1023         txbdp = priv->cur_tx;
1024
1025         /* Clear all but the WRAP status flags */
1026         status = txbdp->status & TXBD_WRAP;
1027
1028         /* Set up checksumming */
1029         if (likely((dev->features & NETIF_F_IP_CSUM)
1030                         && (CHECKSUM_PARTIAL == skb->ip_summed))) {
1031                 fcb = gfar_add_fcb(skb, txbdp);
1032                 status |= TXBD_TOE;
1033                 gfar_tx_checksum(skb, fcb);
1034         }
1035
1036         if (priv->vlan_enable &&
1037                         unlikely(priv->vlgrp && vlan_tx_tag_present(skb))) {
1038                 if (unlikely(NULL == fcb)) {
1039                         fcb = gfar_add_fcb(skb, txbdp);
1040                         status |= TXBD_TOE;
1041                 }
1042
1043                 gfar_tx_vlan(skb, fcb);
1044         }
1045
1046         /* Set buffer length and pointer */
1047         txbdp->length = skb->len;
1048         txbdp->bufPtr = dma_map_single(NULL, skb->data,
1049                         skb->len, DMA_TO_DEVICE);
1050
1051         /* Save the skb pointer so we can free it later */
1052         priv->tx_skbuff[priv->skb_curtx] = skb;
1053
1054         /* Update the current skb pointer (wrapping if this was the last) */
1055         priv->skb_curtx =
1056             (priv->skb_curtx + 1) & TX_RING_MOD_MASK(priv->tx_ring_size);
1057
1058         /* Flag the BD as interrupt-causing */
1059         status |= TXBD_INTERRUPT;
1060
1061         /* Flag the BD as ready to go, last in frame, and  */
1062         /* in need of CRC */
1063         status |= (TXBD_READY | TXBD_LAST | TXBD_CRC);
1064
1065         dev->trans_start = jiffies;
1066
1067         /* The powerpc-specific eieio() is used, as wmb() has too strong
1068          * semantics (it requires synchronization between cacheable and
1069          * uncacheable mappings, which eieio doesn't provide and which we
1070          * don't need), thus requiring a more expensive sync instruction.  At
1071          * some point, the set of architecture-independent barrier functions
1072          * should be expanded to include weaker barriers.
1073          */
1074
1075         eieio();
1076         txbdp->status = status;
1077
1078         /* If this was the last BD in the ring, the next one */
1079         /* is at the beginning of the ring */
1080         if (txbdp->status & TXBD_WRAP)
1081                 txbdp = priv->tx_bd_base;
1082         else
1083                 txbdp++;
1084
1085         /* If the next BD still needs to be cleaned up, then the bds
1086            are full.  We need to tell the kernel to stop sending us stuff. */
1087         if (txbdp == priv->dirty_tx) {
1088                 netif_stop_queue(dev);
1089
1090                 priv->stats.tx_fifo_errors++;
1091         }
1092
1093         /* Update the current txbd to the next one */
1094         priv->cur_tx = txbdp;
1095
1096         /* Tell the DMA to go go go */
1097         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
1098
1099         /* Unlock priv */
1100         spin_unlock_irqrestore(&priv->txlock, flags);
1101
1102         return 0;
1103 }
1104
1105 /* Stops the kernel queue, and halts the controller */
1106 static int gfar_close(struct net_device *dev)
1107 {
1108         struct gfar_private *priv = netdev_priv(dev);
1109
1110         napi_disable(&priv->napi);
1111
1112         stop_gfar(dev);
1113
1114         /* Disconnect from the PHY */
1115         phy_disconnect(priv->phydev);
1116         priv->phydev = NULL;
1117
1118         netif_stop_queue(dev);
1119
1120         return 0;
1121 }
1122
1123 /* returns a net_device_stats structure pointer */
1124 static struct net_device_stats * gfar_get_stats(struct net_device *dev)
1125 {
1126         struct gfar_private *priv = netdev_priv(dev);
1127
1128         return &(priv->stats);
1129 }
1130
1131 /* Changes the mac address if the controller is not running. */
1132 int gfar_set_mac_address(struct net_device *dev)
1133 {
1134         gfar_set_mac_for_addr(dev, 0, dev->dev_addr);
1135
1136         return 0;
1137 }
1138
1139
1140 /* Enables and disables VLAN insertion/extraction */
1141 static void gfar_vlan_rx_register(struct net_device *dev,
1142                 struct vlan_group *grp)
1143 {
1144         struct gfar_private *priv = netdev_priv(dev);
1145         unsigned long flags;
1146         u32 tempval;
1147
1148         spin_lock_irqsave(&priv->rxlock, flags);
1149
1150         priv->vlgrp = grp;
1151
1152         if (grp) {
1153                 /* Enable VLAN tag insertion */
1154                 tempval = gfar_read(&priv->regs->tctrl);
1155                 tempval |= TCTRL_VLINS;
1156
1157                 gfar_write(&priv->regs->tctrl, tempval);
1158
1159                 /* Enable VLAN tag extraction */
1160                 tempval = gfar_read(&priv->regs->rctrl);
1161                 tempval |= RCTRL_VLEX;
1162                 gfar_write(&priv->regs->rctrl, tempval);
1163         } else {
1164                 /* Disable VLAN tag insertion */
1165                 tempval = gfar_read(&priv->regs->tctrl);
1166                 tempval &= ~TCTRL_VLINS;
1167                 gfar_write(&priv->regs->tctrl, tempval);
1168
1169                 /* Disable VLAN tag extraction */
1170                 tempval = gfar_read(&priv->regs->rctrl);
1171                 tempval &= ~RCTRL_VLEX;
1172                 gfar_write(&priv->regs->rctrl, tempval);
1173         }
1174
1175         spin_unlock_irqrestore(&priv->rxlock, flags);
1176 }
1177
1178 static int gfar_change_mtu(struct net_device *dev, int new_mtu)
1179 {
1180         int tempsize, tempval;
1181         struct gfar_private *priv = netdev_priv(dev);
1182         int oldsize = priv->rx_buffer_size;
1183         int frame_size = new_mtu + ETH_HLEN;
1184
1185         if (priv->vlan_enable)
1186                 frame_size += VLAN_ETH_HLEN;
1187
1188         if (gfar_uses_fcb(priv))
1189                 frame_size += GMAC_FCB_LEN;
1190
1191         frame_size += priv->padding;
1192
1193         if ((frame_size < 64) || (frame_size > JUMBO_FRAME_SIZE)) {
1194                 if (netif_msg_drv(priv))
1195                         printk(KERN_ERR "%s: Invalid MTU setting\n",
1196                                         dev->name);
1197                 return -EINVAL;
1198         }
1199
1200         tempsize =
1201             (frame_size & ~(INCREMENTAL_BUFFER_SIZE - 1)) +
1202             INCREMENTAL_BUFFER_SIZE;
1203
1204         /* Only stop and start the controller if it isn't already
1205          * stopped, and we changed something */
1206         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1207                 stop_gfar(dev);
1208
1209         priv->rx_buffer_size = tempsize;
1210
1211         dev->mtu = new_mtu;
1212
1213         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
1214         gfar_write(&priv->regs->maxfrm, priv->rx_buffer_size);
1215
1216         /* If the mtu is larger than the max size for standard
1217          * ethernet frames (ie, a jumbo frame), then set maccfg2
1218          * to allow huge frames, and to check the length */
1219         tempval = gfar_read(&priv->regs->maccfg2);
1220
1221         if (priv->rx_buffer_size > DEFAULT_RX_BUFFER_SIZE)
1222                 tempval |= (MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1223         else
1224                 tempval &= ~(MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1225
1226         gfar_write(&priv->regs->maccfg2, tempval);
1227
1228         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1229                 startup_gfar(dev);
1230
1231         return 0;
1232 }
1233
1234 /* gfar_timeout gets called when a packet has not been
1235  * transmitted after a set amount of time.
1236  * For now, assume that clearing out all the structures, and
1237  * starting over will fix the problem. */
1238 static void gfar_timeout(struct net_device *dev)
1239 {
1240         struct gfar_private *priv = netdev_priv(dev);
1241
1242         priv->stats.tx_errors++;
1243
1244         if (dev->flags & IFF_UP) {
1245                 stop_gfar(dev);
1246                 startup_gfar(dev);
1247         }
1248
1249         netif_schedule(dev);
1250 }
1251
1252 /* Interrupt Handler for Transmit complete */
1253 static irqreturn_t gfar_transmit(int irq, void *dev_id)
1254 {
1255         struct net_device *dev = (struct net_device *) dev_id;
1256         struct gfar_private *priv = netdev_priv(dev);
1257         struct txbd8 *bdp;
1258
1259         /* Clear IEVENT */
1260         gfar_write(&priv->regs->ievent, IEVENT_TX_MASK);
1261
1262         /* Lock priv */
1263         spin_lock(&priv->txlock);
1264         bdp = priv->dirty_tx;
1265         while ((bdp->status & TXBD_READY) == 0) {
1266                 /* If dirty_tx and cur_tx are the same, then either the */
1267                 /* ring is empty or full now (it could only be full in the beginning, */
1268                 /* obviously).  If it is empty, we are done. */
1269                 if ((bdp == priv->cur_tx) && (netif_queue_stopped(dev) == 0))
1270                         break;
1271
1272                 priv->stats.tx_packets++;
1273
1274                 /* Deferred means some collisions occurred during transmit, */
1275                 /* but we eventually sent the packet. */
1276                 if (bdp->status & TXBD_DEF)
1277                         priv->stats.collisions++;
1278
1279                 /* Free the sk buffer associated with this TxBD */
1280                 dev_kfree_skb_irq(priv->tx_skbuff[priv->skb_dirtytx]);
1281                 priv->tx_skbuff[priv->skb_dirtytx] = NULL;
1282                 priv->skb_dirtytx =
1283                     (priv->skb_dirtytx +
1284                      1) & TX_RING_MOD_MASK(priv->tx_ring_size);
1285
1286                 /* update bdp to point at next bd in the ring (wrapping if necessary) */
1287                 if (bdp->status & TXBD_WRAP)
1288                         bdp = priv->tx_bd_base;
1289                 else
1290                         bdp++;
1291
1292                 /* Move dirty_tx to be the next bd */
1293                 priv->dirty_tx = bdp;
1294
1295                 /* We freed a buffer, so now we can restart transmission */
1296                 if (netif_queue_stopped(dev))
1297                         netif_wake_queue(dev);
1298         } /* while ((bdp->status & TXBD_READY) == 0) */
1299
1300         /* If we are coalescing the interrupts, reset the timer */
1301         /* Otherwise, clear it */
1302         if (priv->txcoalescing)
1303                 gfar_write(&priv->regs->txic,
1304                            mk_ic_value(priv->txcount, priv->txtime));
1305         else
1306                 gfar_write(&priv->regs->txic, 0);
1307
1308         spin_unlock(&priv->txlock);
1309
1310         return IRQ_HANDLED;
1311 }
1312
1313 struct sk_buff * gfar_new_skb(struct net_device *dev, struct rxbd8 *bdp)
1314 {
1315         unsigned int alignamount;
1316         struct gfar_private *priv = netdev_priv(dev);
1317         struct sk_buff *skb = NULL;
1318         unsigned int timeout = SKB_ALLOC_TIMEOUT;
1319
1320         /* We have to allocate the skb, so keep trying till we succeed */
1321         while ((!skb) && timeout--)
1322                 skb = dev_alloc_skb(priv->rx_buffer_size + RXBUF_ALIGNMENT);
1323
1324         if (NULL == skb)
1325                 return NULL;
1326
1327         alignamount = RXBUF_ALIGNMENT -
1328                 (((unsigned long) skb->data) & (RXBUF_ALIGNMENT - 1));
1329
1330         /* We need the data buffer to be aligned properly.  We will reserve
1331          * as many bytes as needed to align the data properly
1332          */
1333         skb_reserve(skb, alignamount);
1334
1335         bdp->bufPtr = dma_map_single(NULL, skb->data,
1336                         priv->rx_buffer_size, DMA_FROM_DEVICE);
1337
1338         bdp->length = 0;
1339
1340         /* Mark the buffer empty */
1341         eieio();
1342         bdp->status |= (RXBD_EMPTY | RXBD_INTERRUPT);
1343
1344         return skb;
1345 }
1346
1347 static inline void count_errors(unsigned short status, struct gfar_private *priv)
1348 {
1349         struct net_device_stats *stats = &priv->stats;
1350         struct gfar_extra_stats *estats = &priv->extra_stats;
1351
1352         /* If the packet was truncated, none of the other errors
1353          * matter */
1354         if (status & RXBD_TRUNCATED) {
1355                 stats->rx_length_errors++;
1356
1357                 estats->rx_trunc++;
1358
1359                 return;
1360         }
1361         /* Count the errors, if there were any */
1362         if (status & (RXBD_LARGE | RXBD_SHORT)) {
1363                 stats->rx_length_errors++;
1364
1365                 if (status & RXBD_LARGE)
1366                         estats->rx_large++;
1367                 else
1368                         estats->rx_short++;
1369         }
1370         if (status & RXBD_NONOCTET) {
1371                 stats->rx_frame_errors++;
1372                 estats->rx_nonoctet++;
1373         }
1374         if (status & RXBD_CRCERR) {
1375                 estats->rx_crcerr++;
1376                 stats->rx_crc_errors++;
1377         }
1378         if (status & RXBD_OVERRUN) {
1379                 estats->rx_overrun++;
1380                 stats->rx_crc_errors++;
1381         }
1382 }
1383
1384 irqreturn_t gfar_receive(int irq, void *dev_id)
1385 {
1386         struct net_device *dev = (struct net_device *) dev_id;
1387         struct gfar_private *priv = netdev_priv(dev);
1388 #ifdef CONFIG_GFAR_NAPI
1389         u32 tempval;
1390 #else
1391         unsigned long flags;
1392 #endif
1393
1394         /* Clear IEVENT, so rx interrupt isn't called again
1395          * because of this interrupt */
1396         gfar_write(&priv->regs->ievent, IEVENT_RX_MASK);
1397
1398         /* support NAPI */
1399 #ifdef CONFIG_GFAR_NAPI
1400         if (netif_rx_schedule_prep(dev, &priv->napi)) {
1401                 tempval = gfar_read(&priv->regs->imask);
1402                 tempval &= IMASK_RX_DISABLED;
1403                 gfar_write(&priv->regs->imask, tempval);
1404
1405                 __netif_rx_schedule(dev, &priv->napi);
1406         } else {
1407                 if (netif_msg_rx_err(priv))
1408                         printk(KERN_DEBUG "%s: receive called twice (%x)[%x]\n",
1409                                 dev->name, gfar_read(&priv->regs->ievent),
1410                                 gfar_read(&priv->regs->imask));
1411         }
1412 #else
1413
1414         spin_lock_irqsave(&priv->rxlock, flags);
1415         gfar_clean_rx_ring(dev, priv->rx_ring_size);
1416
1417         /* If we are coalescing interrupts, update the timer */
1418         /* Otherwise, clear it */
1419         if (priv->rxcoalescing)
1420                 gfar_write(&priv->regs->rxic,
1421                            mk_ic_value(priv->rxcount, priv->rxtime));
1422         else
1423                 gfar_write(&priv->regs->rxic, 0);
1424
1425         spin_unlock_irqrestore(&priv->rxlock, flags);
1426 #endif
1427
1428         return IRQ_HANDLED;
1429 }
1430
1431 static inline int gfar_rx_vlan(struct sk_buff *skb,
1432                 struct vlan_group *vlgrp, unsigned short vlctl)
1433 {
1434 #ifdef CONFIG_GFAR_NAPI
1435         return vlan_hwaccel_receive_skb(skb, vlgrp, vlctl);
1436 #else
1437         return vlan_hwaccel_rx(skb, vlgrp, vlctl);
1438 #endif
1439 }
1440
1441 static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
1442 {
1443         /* If valid headers were found, and valid sums
1444          * were verified, then we tell the kernel that no
1445          * checksumming is necessary.  Otherwise, it is */
1446         if ((fcb->flags & RXFCB_CSUM_MASK) == (RXFCB_CIP | RXFCB_CTU))
1447                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1448         else
1449                 skb->ip_summed = CHECKSUM_NONE;
1450 }
1451
1452
1453 static inline struct rxfcb *gfar_get_fcb(struct sk_buff *skb)
1454 {
1455         struct rxfcb *fcb = (struct rxfcb *)skb->data;
1456
1457         /* Remove the FCB from the skb */
1458         skb_pull(skb, GMAC_FCB_LEN);
1459
1460         return fcb;
1461 }
1462
1463 /* gfar_process_frame() -- handle one incoming packet if skb
1464  * isn't NULL.  */
1465 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
1466                 int length)
1467 {
1468         struct gfar_private *priv = netdev_priv(dev);
1469         struct rxfcb *fcb = NULL;
1470
1471         if (NULL == skb) {
1472                 if (netif_msg_rx_err(priv))
1473                         printk(KERN_WARNING "%s: Missing skb!!.\n", dev->name);
1474                 priv->stats.rx_dropped++;
1475                 priv->extra_stats.rx_skbmissing++;
1476         } else {
1477                 int ret;
1478
1479                 /* Prep the skb for the packet */
1480                 skb_put(skb, length);
1481
1482                 /* Grab the FCB if there is one */
1483                 if (gfar_uses_fcb(priv))
1484                         fcb = gfar_get_fcb(skb);
1485
1486                 /* Remove the padded bytes, if there are any */
1487                 if (priv->padding)
1488                         skb_pull(skb, priv->padding);
1489
1490                 if (priv->rx_csum_enable)
1491                         gfar_rx_checksum(skb, fcb);
1492
1493                 /* Tell the skb what kind of packet this is */
1494                 skb->protocol = eth_type_trans(skb, dev);
1495
1496                 /* Send the packet up the stack */
1497                 if (unlikely(priv->vlgrp && (fcb->flags & RXFCB_VLN)))
1498                         ret = gfar_rx_vlan(skb, priv->vlgrp, fcb->vlctl);
1499                 else
1500                         ret = RECEIVE(skb);
1501
1502                 if (NET_RX_DROP == ret)
1503                         priv->extra_stats.kernel_dropped++;
1504         }
1505
1506         return 0;
1507 }
1508
1509 /* gfar_clean_rx_ring() -- Processes each frame in the rx ring
1510  *   until the budget/quota has been reached. Returns the number
1511  *   of frames handled
1512  */
1513 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
1514 {
1515         struct rxbd8 *bdp;
1516         struct sk_buff *skb;
1517         u16 pkt_len;
1518         int howmany = 0;
1519         struct gfar_private *priv = netdev_priv(dev);
1520
1521         /* Get the first full descriptor */
1522         bdp = priv->cur_rx;
1523
1524         while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
1525                 rmb();
1526                 skb = priv->rx_skbuff[priv->skb_currx];
1527
1528                 if (!(bdp->status &
1529                       (RXBD_LARGE | RXBD_SHORT | RXBD_NONOCTET
1530                        | RXBD_CRCERR | RXBD_OVERRUN | RXBD_TRUNCATED))) {
1531                         /* Increment the number of packets */
1532                         priv->stats.rx_packets++;
1533                         howmany++;
1534
1535                         /* Remove the FCS from the packet length */
1536                         pkt_len = bdp->length - 4;
1537
1538                         gfar_process_frame(dev, skb, pkt_len);
1539
1540                         priv->stats.rx_bytes += pkt_len;
1541                 } else {
1542                         count_errors(bdp->status, priv);
1543
1544                         if (skb)
1545                                 dev_kfree_skb_any(skb);
1546
1547                         priv->rx_skbuff[priv->skb_currx] = NULL;
1548                 }
1549
1550                 dev->last_rx = jiffies;
1551
1552                 /* Clear the status flags for this buffer */
1553                 bdp->status &= ~RXBD_STATS;
1554
1555                 /* Add another skb for the future */
1556                 skb = gfar_new_skb(dev, bdp);
1557                 priv->rx_skbuff[priv->skb_currx] = skb;
1558
1559                 /* Update to the next pointer */
1560                 if (bdp->status & RXBD_WRAP)
1561                         bdp = priv->rx_bd_base;
1562                 else
1563                         bdp++;
1564
1565                 /* update to point at the next skb */
1566                 priv->skb_currx =
1567                     (priv->skb_currx +
1568                      1) & RX_RING_MOD_MASK(priv->rx_ring_size);
1569
1570         }
1571
1572         /* Update the current rxbd pointer to be the next one */
1573         priv->cur_rx = bdp;
1574
1575         return howmany;
1576 }
1577
1578 #ifdef CONFIG_GFAR_NAPI
1579 static int gfar_poll(struct napi_struct *napi, int budget)
1580 {
1581         struct gfar_private *priv = container_of(napi, struct gfar_private, napi);
1582         struct net_device *dev = priv->dev;
1583         int howmany;
1584
1585         howmany = gfar_clean_rx_ring(dev, budget);
1586
1587         if (howmany < budget) {
1588                 netif_rx_complete(dev, napi);
1589
1590                 /* Clear the halt bit in RSTAT */
1591                 gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
1592
1593                 gfar_write(&priv->regs->imask, IMASK_DEFAULT);
1594
1595                 /* If we are coalescing interrupts, update the timer */
1596                 /* Otherwise, clear it */
1597                 if (priv->rxcoalescing)
1598                         gfar_write(&priv->regs->rxic,
1599                                    mk_ic_value(priv->rxcount, priv->rxtime));
1600                 else
1601                         gfar_write(&priv->regs->rxic, 0);
1602         }
1603
1604         return howmany;
1605 }
1606 #endif
1607
1608 #ifdef CONFIG_NET_POLL_CONTROLLER
1609 /*
1610  * Polling 'interrupt' - used by things like netconsole to send skbs
1611  * without having to re-enable interrupts. It's not called while
1612  * the interrupt routine is executing.
1613  */
1614 static void gfar_netpoll(struct net_device *dev)
1615 {
1616         struct gfar_private *priv = netdev_priv(dev);
1617
1618         /* If the device has multiple interrupts, run tx/rx */
1619         if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
1620                 disable_irq(priv->interruptTransmit);
1621                 disable_irq(priv->interruptReceive);
1622                 disable_irq(priv->interruptError);
1623                 gfar_interrupt(priv->interruptTransmit, dev);
1624                 enable_irq(priv->interruptError);
1625                 enable_irq(priv->interruptReceive);
1626                 enable_irq(priv->interruptTransmit);
1627         } else {
1628                 disable_irq(priv->interruptTransmit);
1629                 gfar_interrupt(priv->interruptTransmit, dev);
1630                 enable_irq(priv->interruptTransmit);
1631         }
1632 }
1633 #endif
1634
1635 /* The interrupt handler for devices with one interrupt */
1636 static irqreturn_t gfar_interrupt(int irq, void *dev_id)
1637 {
1638         struct net_device *dev = dev_id;
1639         struct gfar_private *priv = netdev_priv(dev);
1640
1641         /* Save ievent for future reference */
1642         u32 events = gfar_read(&priv->regs->ievent);
1643
1644         /* Check for reception */
1645         if (events & IEVENT_RX_MASK)
1646                 gfar_receive(irq, dev_id);
1647
1648         /* Check for transmit completion */
1649         if (events & IEVENT_TX_MASK)
1650                 gfar_transmit(irq, dev_id);
1651
1652         /* Check for errors */
1653         if (events & IEVENT_ERR_MASK)
1654                 gfar_error(irq, dev_id);
1655
1656         return IRQ_HANDLED;
1657 }
1658
1659 /* Called every time the controller might need to be made
1660  * aware of new link state.  The PHY code conveys this
1661  * information through variables in the phydev structure, and this
1662  * function converts those variables into the appropriate
1663  * register values, and can bring down the device if needed.
1664  */
1665 static void adjust_link(struct net_device *dev)
1666 {
1667         struct gfar_private *priv = netdev_priv(dev);
1668         struct gfar __iomem *regs = priv->regs;
1669         unsigned long flags;
1670         struct phy_device *phydev = priv->phydev;
1671         int new_state = 0;
1672
1673         spin_lock_irqsave(&priv->txlock, flags);
1674         if (phydev->link) {
1675                 u32 tempval = gfar_read(&regs->maccfg2);
1676                 u32 ecntrl = gfar_read(&regs->ecntrl);
1677
1678                 /* Now we make sure that we can be in full duplex mode.
1679                  * If not, we operate in half-duplex mode. */
1680                 if (phydev->duplex != priv->oldduplex) {
1681                         new_state = 1;
1682                         if (!(phydev->duplex))
1683                                 tempval &= ~(MACCFG2_FULL_DUPLEX);
1684                         else
1685                                 tempval |= MACCFG2_FULL_DUPLEX;
1686
1687                         priv->oldduplex = phydev->duplex;
1688                 }
1689
1690                 if (phydev->speed != priv->oldspeed) {
1691                         new_state = 1;
1692                         switch (phydev->speed) {
1693                         case 1000:
1694                                 tempval =
1695                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_GMII);
1696                                 break;
1697                         case 100:
1698                         case 10:
1699                                 tempval =
1700                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_MII);
1701
1702                                 /* Reduced mode distinguishes
1703                                  * between 10 and 100 */
1704                                 if (phydev->speed == SPEED_100)
1705                                         ecntrl |= ECNTRL_R100;
1706                                 else
1707                                         ecntrl &= ~(ECNTRL_R100);
1708                                 break;
1709                         default:
1710                                 if (netif_msg_link(priv))
1711                                         printk(KERN_WARNING
1712                                                 "%s: Ack!  Speed (%d) is not 10/100/1000!\n",
1713                                                 dev->name, phydev->speed);
1714                                 break;
1715                         }
1716
1717                         priv->oldspeed = phydev->speed;
1718                 }
1719
1720                 gfar_write(&regs->maccfg2, tempval);
1721                 gfar_write(&regs->ecntrl, ecntrl);
1722
1723                 if (!priv->oldlink) {
1724                         new_state = 1;
1725                         priv->oldlink = 1;
1726                         netif_schedule(dev);
1727                 }
1728         } else if (priv->oldlink) {
1729                 new_state = 1;
1730                 priv->oldlink = 0;
1731                 priv->oldspeed = 0;
1732                 priv->oldduplex = -1;
1733         }
1734
1735         if (new_state && netif_msg_link(priv))
1736                 phy_print_status(phydev);
1737
1738         spin_unlock_irqrestore(&priv->txlock, flags);
1739 }
1740
1741 /* Update the hash table based on the current list of multicast
1742  * addresses we subscribe to.  Also, change the promiscuity of
1743  * the device based on the flags (this function is called
1744  * whenever dev->flags is changed */
1745 static void gfar_set_multi(struct net_device *dev)
1746 {
1747         struct dev_mc_list *mc_ptr;
1748         struct gfar_private *priv = netdev_priv(dev);
1749         struct gfar __iomem *regs = priv->regs;
1750         u32 tempval;
1751
1752         if(dev->flags & IFF_PROMISC) {
1753                 /* Set RCTRL to PROM */
1754                 tempval = gfar_read(&regs->rctrl);
1755                 tempval |= RCTRL_PROM;
1756                 gfar_write(&regs->rctrl, tempval);
1757         } else {
1758                 /* Set RCTRL to not PROM */
1759                 tempval = gfar_read(&regs->rctrl);
1760                 tempval &= ~(RCTRL_PROM);
1761                 gfar_write(&regs->rctrl, tempval);
1762         }
1763
1764         if(dev->flags & IFF_ALLMULTI) {
1765                 /* Set the hash to rx all multicast frames */
1766                 gfar_write(&regs->igaddr0, 0xffffffff);
1767                 gfar_write(&regs->igaddr1, 0xffffffff);
1768                 gfar_write(&regs->igaddr2, 0xffffffff);
1769                 gfar_write(&regs->igaddr3, 0xffffffff);
1770                 gfar_write(&regs->igaddr4, 0xffffffff);
1771                 gfar_write(&regs->igaddr5, 0xffffffff);
1772                 gfar_write(&regs->igaddr6, 0xffffffff);
1773                 gfar_write(&regs->igaddr7, 0xffffffff);
1774                 gfar_write(&regs->gaddr0, 0xffffffff);
1775                 gfar_write(&regs->gaddr1, 0xffffffff);
1776                 gfar_write(&regs->gaddr2, 0xffffffff);
1777                 gfar_write(&regs->gaddr3, 0xffffffff);
1778                 gfar_write(&regs->gaddr4, 0xffffffff);
1779                 gfar_write(&regs->gaddr5, 0xffffffff);
1780                 gfar_write(&regs->gaddr6, 0xffffffff);
1781                 gfar_write(&regs->gaddr7, 0xffffffff);
1782         } else {
1783                 int em_num;
1784                 int idx;
1785
1786                 /* zero out the hash */
1787                 gfar_write(&regs->igaddr0, 0x0);
1788                 gfar_write(&regs->igaddr1, 0x0);
1789                 gfar_write(&regs->igaddr2, 0x0);
1790                 gfar_write(&regs->igaddr3, 0x0);
1791                 gfar_write(&regs->igaddr4, 0x0);
1792                 gfar_write(&regs->igaddr5, 0x0);
1793                 gfar_write(&regs->igaddr6, 0x0);
1794                 gfar_write(&regs->igaddr7, 0x0);
1795                 gfar_write(&regs->gaddr0, 0x0);
1796                 gfar_write(&regs->gaddr1, 0x0);
1797                 gfar_write(&regs->gaddr2, 0x0);
1798                 gfar_write(&regs->gaddr3, 0x0);
1799                 gfar_write(&regs->gaddr4, 0x0);
1800                 gfar_write(&regs->gaddr5, 0x0);
1801                 gfar_write(&regs->gaddr6, 0x0);
1802                 gfar_write(&regs->gaddr7, 0x0);
1803
1804                 /* If we have extended hash tables, we need to
1805                  * clear the exact match registers to prepare for
1806                  * setting them */
1807                 if (priv->extended_hash) {
1808                         em_num = GFAR_EM_NUM + 1;
1809                         gfar_clear_exact_match(dev);
1810                         idx = 1;
1811                 } else {
1812                         idx = 0;
1813                         em_num = 0;
1814                 }
1815
1816                 if(dev->mc_count == 0)
1817                         return;
1818
1819                 /* Parse the list, and set the appropriate bits */
1820                 for(mc_ptr = dev->mc_list; mc_ptr; mc_ptr = mc_ptr->next) {
1821                         if (idx < em_num) {
1822                                 gfar_set_mac_for_addr(dev, idx,
1823                                                 mc_ptr->dmi_addr);
1824                                 idx++;
1825                         } else
1826                                 gfar_set_hash_for_addr(dev, mc_ptr->dmi_addr);
1827                 }
1828         }
1829
1830         return;
1831 }
1832
1833
1834 /* Clears each of the exact match registers to zero, so they
1835  * don't interfere with normal reception */
1836 static void gfar_clear_exact_match(struct net_device *dev)
1837 {
1838         int idx;
1839         u8 zero_arr[MAC_ADDR_LEN] = {0,0,0,0,0,0};
1840
1841         for(idx = 1;idx < GFAR_EM_NUM + 1;idx++)
1842                 gfar_set_mac_for_addr(dev, idx, (u8 *)zero_arr);
1843 }
1844
1845 /* Set the appropriate hash bit for the given addr */
1846 /* The algorithm works like so:
1847  * 1) Take the Destination Address (ie the multicast address), and
1848  * do a CRC on it (little endian), and reverse the bits of the
1849  * result.
1850  * 2) Use the 8 most significant bits as a hash into a 256-entry
1851  * table.  The table is controlled through 8 32-bit registers:
1852  * gaddr0-7.  gaddr0's MSB is entry 0, and gaddr7's LSB is
1853  * gaddr7.  This means that the 3 most significant bits in the
1854  * hash index which gaddr register to use, and the 5 other bits
1855  * indicate which bit (assuming an IBM numbering scheme, which
1856  * for PowerPC (tm) is usually the case) in the register holds
1857  * the entry. */
1858 static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr)
1859 {
1860         u32 tempval;
1861         struct gfar_private *priv = netdev_priv(dev);
1862         u32 result = ether_crc(MAC_ADDR_LEN, addr);
1863         int width = priv->hash_width;
1864         u8 whichbit = (result >> (32 - width)) & 0x1f;
1865         u8 whichreg = result >> (32 - width + 5);
1866         u32 value = (1 << (31-whichbit));
1867
1868         tempval = gfar_read(priv->hash_regs[whichreg]);
1869         tempval |= value;
1870         gfar_write(priv->hash_regs[whichreg], tempval);
1871
1872         return;
1873 }
1874
1875
1876 /* There are multiple MAC Address register pairs on some controllers
1877  * This function sets the numth pair to a given address
1878  */
1879 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr)
1880 {
1881         struct gfar_private *priv = netdev_priv(dev);
1882         int idx;
1883         char tmpbuf[MAC_ADDR_LEN];
1884         u32 tempval;
1885         u32 __iomem *macptr = &priv->regs->macstnaddr1;
1886
1887         macptr += num*2;
1888
1889         /* Now copy it into the mac registers backwards, cuz */
1890         /* little endian is silly */
1891         for (idx = 0; idx < MAC_ADDR_LEN; idx++)
1892                 tmpbuf[MAC_ADDR_LEN - 1 - idx] = addr[idx];
1893
1894         gfar_write(macptr, *((u32 *) (tmpbuf)));
1895
1896         tempval = *((u32 *) (tmpbuf + 4));
1897
1898         gfar_write(macptr+1, tempval);
1899 }
1900
1901 /* GFAR error interrupt handler */
1902 static irqreturn_t gfar_error(int irq, void *dev_id)
1903 {
1904         struct net_device *dev = dev_id;
1905         struct gfar_private *priv = netdev_priv(dev);
1906
1907         /* Save ievent for future reference */
1908         u32 events = gfar_read(&priv->regs->ievent);
1909
1910         /* Clear IEVENT */
1911         gfar_write(&priv->regs->ievent, IEVENT_ERR_MASK);
1912
1913         /* Hmm... */
1914         if (netif_msg_rx_err(priv) || netif_msg_tx_err(priv))
1915                 printk(KERN_DEBUG "%s: error interrupt (ievent=0x%08x imask=0x%08x)\n",
1916                        dev->name, events, gfar_read(&priv->regs->imask));
1917
1918         /* Update the error counters */
1919         if (events & IEVENT_TXE) {
1920                 priv->stats.tx_errors++;
1921
1922                 if (events & IEVENT_LC)
1923                         priv->stats.tx_window_errors++;
1924                 if (events & IEVENT_CRL)
1925                         priv->stats.tx_aborted_errors++;
1926                 if (events & IEVENT_XFUN) {
1927                         if (netif_msg_tx_err(priv))
1928                                 printk(KERN_DEBUG "%s: TX FIFO underrun, "
1929                                        "packet dropped.\n", dev->name);
1930                         priv->stats.tx_dropped++;
1931                         priv->extra_stats.tx_underrun++;
1932
1933                         /* Reactivate the Tx Queues */
1934                         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
1935                 }
1936                 if (netif_msg_tx_err(priv))
1937                         printk(KERN_DEBUG "%s: Transmit Error\n", dev->name);
1938         }
1939         if (events & IEVENT_BSY) {
1940                 priv->stats.rx_errors++;
1941                 priv->extra_stats.rx_bsy++;
1942
1943                 gfar_receive(irq, dev_id);
1944
1945 #ifndef CONFIG_GFAR_NAPI
1946                 /* Clear the halt bit in RSTAT */
1947                 gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
1948 #endif
1949
1950                 if (netif_msg_rx_err(priv))
1951                         printk(KERN_DEBUG "%s: busy error (rstat: %x)\n",
1952                                dev->name, gfar_read(&priv->regs->rstat));
1953         }
1954         if (events & IEVENT_BABR) {
1955                 priv->stats.rx_errors++;
1956                 priv->extra_stats.rx_babr++;
1957
1958                 if (netif_msg_rx_err(priv))
1959                         printk(KERN_DEBUG "%s: babbling RX error\n", dev->name);
1960         }
1961         if (events & IEVENT_EBERR) {
1962                 priv->extra_stats.eberr++;
1963                 if (netif_msg_rx_err(priv))
1964                         printk(KERN_DEBUG "%s: bus error\n", dev->name);
1965         }
1966         if ((events & IEVENT_RXC) && netif_msg_rx_status(priv))
1967                 printk(KERN_DEBUG "%s: control frame\n", dev->name);
1968
1969         if (events & IEVENT_BABT) {
1970                 priv->extra_stats.tx_babt++;
1971                 if (netif_msg_tx_err(priv))
1972                         printk(KERN_DEBUG "%s: babbling TX error\n", dev->name);
1973         }
1974         return IRQ_HANDLED;
1975 }
1976
1977 /* Structure for a device driver */
1978 static struct platform_driver gfar_driver = {
1979         .probe = gfar_probe,
1980         .remove = gfar_remove,
1981         .driver = {
1982                 .name = "fsl-gianfar",
1983         },
1984 };
1985
1986 static int __init gfar_init(void)
1987 {
1988         int err = gfar_mdio_init();
1989
1990         if (err)
1991                 return err;
1992
1993         err = platform_driver_register(&gfar_driver);
1994
1995         if (err)
1996                 gfar_mdio_exit();
1997
1998         return err;
1999 }
2000
2001 static void __exit gfar_exit(void)
2002 {
2003         platform_driver_unregister(&gfar_driver);
2004         gfar_mdio_exit();
2005 }
2006
2007 module_init(gfar_init);
2008 module_exit(gfar_exit);
2009