drivers/net/gianfar.c

   1 /*
   2  * drivers/net/gianfar.c
   3  *
   4  * Gianfar Ethernet Driver
   5  * This driver is designed for the non-CPM ethernet controllers
   6  * on the 85xx and 83xx family of integrated processors
   7  * Based on 8260_io/fcc_enet.c
   8  *
   9  * Author: Andy Fleming
  10  * Maintainer: Kumar Gala
  11  *
  12  * Copyright (c) 2002-2006 Freescale Semiconductor, Inc.
  13  * Copyright (c) 2007 MontaVista Software, Inc.
  14  *
  15  * This program is free software; you can redistribute  it and/or modify it
  16  * under  the terms of  the GNU General  Public License as published by the
  17  * Free Software Foundation;  either version 2 of the  License, or (at your
  18  * option) any later version.
  19  *
  20  *  Gianfar:  AKA Lambda Draconis, "Dragon"
  21  *  RA 11 31 24.2
  22  *  Dec +69 19 52
  23  *  V 3.84
  24  *  B-V +1.62
  25  *
  26  *  Theory of operation
  27  *
  28  *  The driver is initialized through of_device. Configuration information
  29  *  is therefore conveyed through an OF-style device tree.
  30  *
  31  *  The Gianfar Ethernet Controller uses a ring of buffer
  32  *  descriptors.  The beginning is indicated by a register
  33  *  pointing to the physical address of the start of the ring.
  34  *  The end is determined by a "wrap" bit being set in the
  35  *  last descriptor of the ring.
  36  *
  37  *  When a packet is received, the RXF bit in the
  38  *  IEVENT register is set, triggering an interrupt when the
  39  *  corresponding bit in the IMASK register is also set (if
  40  *  interrupt coalescing is active, then the interrupt may not
  41  *  happen immediately, but will wait until either a set number
  42  *  of frames or amount of time have passed).  In NAPI, the
  43  *  interrupt handler will signal there is work to be done, and
  44  *  exit. This method will start at the last known empty
  45  *  descriptor, and process every subsequent descriptor until there
  46  *  are none left with data (NAPI will stop after a set number of
  47  *  packets to give time to other tasks, but will eventually
  48  *  process all the packets).  The data arrives inside a
  49  *  pre-allocated skb, and so after the skb is passed up to the
  50  *  stack, a new skb must be allocated, and the address field in
  51  *  the buffer descriptor must be updated to indicate this new
  52  *  skb.
  53  *
  54  *  When the kernel requests that a packet be transmitted, the
  55  *  driver starts where it left off last time, and points the
  56  *  descriptor at the buffer which was passed in.  The driver
  57  *  then informs the DMA engine that there are packets ready to
  58  *  be transmitted.  Once the controller is finished transmitting
  59  *  the packet, an interrupt may be triggered (under the same
  60  *  conditions as for reception, but depending on the TXF bit).
  61  *  The driver then cleans up the buffer.
  62  */
  63
  64 #include <linux/kernel.h>
  65 #include <linux/string.h>
  66 #include <linux/errno.h>
  67 #include <linux/unistd.h>
  68 #include <linux/slab.h>
  69 #include <linux/interrupt.h>
  70 #include <linux/init.h>
  71 #include <linux/delay.h>
  72 #include <linux/netdevice.h>
  73 #include <linux/etherdevice.h>
  74 #include <linux/skbuff.h>
  75 #include <linux/if_vlan.h>
  76 #include <linux/spinlock.h>
  77 #include <linux/mm.h>
  78 #include <linux/of_mdio.h>
  79 #include <linux/of_platform.h>
  80 #include <linux/ip.h>
  81 #include <linux/tcp.h>
  82 #include <linux/udp.h>
  83 #include <linux/in.h>
  84
  85 #include <asm/io.h>
  86 #include <asm/irq.h>
  87 #include <asm/uaccess.h>
  88 #include <linux/module.h>
  89 #include <linux/dma-mapping.h>
  90 #include <linux/crc32.h>
  91 #include <linux/mii.h>
  92 #include <linux/phy.h>
  93 #include <linux/phy_fixed.h>
  94 #include <linux/of.h>
  95
  96 #include "gianfar.h"
  97 #include "fsl_pq_mdio.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 of_device *ofdev,
 123                 const struct of_device_id *match);
 124 static int gfar_remove(struct of_device *ofdev);
 125 static void free_skb_resources(struct gfar_private *priv);
 126 static void gfar_set_multi(struct net_device *dev);
 127 static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr);
 128 static void gfar_configure_serdes(struct net_device *dev);
 129 static int gfar_poll(struct napi_struct *napi, int budget);
 130 #ifdef CONFIG_NET_POLL_CONTROLLER
 131 static void gfar_netpoll(struct net_device *dev);
 132 #endif
 133 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit);
 134 static int gfar_clean_tx_ring(struct net_device *dev);
 135 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
 136                               int amount_pull);
 137 static void gfar_vlan_rx_register(struct net_device *netdev,
 138                                 struct vlan_group *grp);
 139 void gfar_halt(struct net_device *dev);
 140 static void gfar_halt_nodisable(struct net_device *dev);
 141 void gfar_start(struct net_device *dev);
 142 static void gfar_clear_exact_match(struct net_device *dev);
 143 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr);
 144 static int gfar_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 145
 146 MODULE_AUTHOR("Freescale Semiconductor, Inc");
 147 MODULE_DESCRIPTION("Gianfar Ethernet Driver");
 148 MODULE_LICENSE("GPL");
 149
 150 static const struct net_device_ops gfar_netdev_ops = {
 151         .ndo_open = gfar_enet_open,
 152         .ndo_start_xmit = gfar_start_xmit,
 153         .ndo_stop = gfar_close,
 154         .ndo_change_mtu = gfar_change_mtu,
 155         .ndo_set_multicast_list = gfar_set_multi,
 156         .ndo_tx_timeout = gfar_timeout,
 157         .ndo_do_ioctl = gfar_ioctl,
 158         .ndo_vlan_rx_register = gfar_vlan_rx_register,
 159         .ndo_set_mac_address = eth_mac_addr,
 160         .ndo_validate_addr = eth_validate_addr,
 161 #ifdef CONFIG_NET_POLL_CONTROLLER
 162         .ndo_poll_controller = gfar_netpoll,
 163 #endif
 164 };
 165
 166 /* Returns 1 if incoming frames use an FCB */
 167 static inline int gfar_uses_fcb(struct gfar_private *priv)
 168 {
 169         return priv->vlgrp || priv->rx_csum_enable;
 170 }
 171
 172 static int gfar_of_init(struct net_device *dev)
 173 {
 174         const char *model;
 175         const char *ctype;
 176         const void *mac_addr;
 177         u64 addr, size;
 178         int err = 0;
 179         struct gfar_private *priv = netdev_priv(dev);
 180         struct device_node *np = priv->node;
 181         const u32 *stash;
 182         const u32 *stash_len;
 183         const u32 *stash_idx;
 184
 185         if (!np || !of_device_is_available(np))
 186                 return -ENODEV;
 187
 188         /* get a pointer to the register memory */
 189         addr = of_translate_address(np, of_get_address(np, 0, &size, NULL));
 190         priv->regs = ioremap(addr, size);
 191
 192         if (priv->regs == NULL)
 193                 return -ENOMEM;
 194
 195         priv->interruptTransmit = irq_of_parse_and_map(np, 0);
 196
 197         model = of_get_property(np, "model", NULL);
 198
 199         /* If we aren't the FEC we have multiple interrupts */
 200         if (model && strcasecmp(model, "FEC")) {
 201                 priv->interruptReceive = irq_of_parse_and_map(np, 1);
 202
 203                 priv->interruptError = irq_of_parse_and_map(np, 2);
 204
 205                 if (priv->interruptTransmit < 0 ||
 206                                 priv->interruptReceive < 0 ||
 207                                 priv->interruptError < 0) {
 208                         err = -EINVAL;
 209                         goto err_out;
 210                 }
 211         }
 212
 213         stash = of_get_property(np, "bd-stash", NULL);
 214
 215         if(stash) {
 216                 priv->device_flags |= FSL_GIANFAR_DEV_HAS_BD_STASHING;
 217                 priv->bd_stash_en = 1;
 218         }
 219
 220         stash_len = of_get_property(np, "rx-stash-len", NULL);
 221
 222         if (stash_len)
 223                 priv->rx_stash_size = *stash_len;
 224
 225         stash_idx = of_get_property(np, "rx-stash-idx", NULL);
 226
 227         if (stash_idx)
 228                 priv->rx_stash_index = *stash_idx;
 229
 230         if (stash_len || stash_idx)
 231                 priv->device_flags |= FSL_GIANFAR_DEV_HAS_BUF_STASHING;
 232
 233         mac_addr = of_get_mac_address(np);
 234         if (mac_addr)
 235                 memcpy(dev->dev_addr, mac_addr, MAC_ADDR_LEN);
 236
 237         if (model && !strcasecmp(model, "TSEC"))
 238                 priv->device_flags =
 239                         FSL_GIANFAR_DEV_HAS_GIGABIT |
 240                         FSL_GIANFAR_DEV_HAS_COALESCE |
 241                         FSL_GIANFAR_DEV_HAS_RMON |
 242                         FSL_GIANFAR_DEV_HAS_MULTI_INTR;
 243         if (model && !strcasecmp(model, "eTSEC"))
 244                 priv->device_flags =
 245                         FSL_GIANFAR_DEV_HAS_GIGABIT |
 246                         FSL_GIANFAR_DEV_HAS_COALESCE |
 247                         FSL_GIANFAR_DEV_HAS_RMON |
 248                         FSL_GIANFAR_DEV_HAS_MULTI_INTR |
 249                         FSL_GIANFAR_DEV_HAS_PADDING |
 250                         FSL_GIANFAR_DEV_HAS_CSUM |
 251                         FSL_GIANFAR_DEV_HAS_VLAN |
 252                         FSL_GIANFAR_DEV_HAS_MAGIC_PACKET |
 253                         FSL_GIANFAR_DEV_HAS_EXTENDED_HASH;
 254
 255         ctype = of_get_property(np, "phy-connection-type", NULL);
 256
 257         /* We only care about rgmii-id.  The rest are autodetected */
 258         if (ctype && !strcmp(ctype, "rgmii-id"))
 259                 priv->interface = PHY_INTERFACE_MODE_RGMII_ID;
 260         else
 261                 priv->interface = PHY_INTERFACE_MODE_MII;
 262
 263         if (of_get_property(np, "fsl,magic-packet", NULL))
 264                 priv->device_flags |= FSL_GIANFAR_DEV_HAS_MAGIC_PACKET;
 265
 266         priv->phy_node = of_parse_phandle(np, "phy-handle", 0);
 267
 268         /* Find the TBI PHY.  If it's not there, we don't support SGMII */
 269         priv->tbi_node = of_parse_phandle(np, "tbi-handle", 0);
 270
 271         return 0;
 272
 273 err_out:
 274         iounmap(priv->regs);
 275         return err;
 276 }
 277
 278 /* Ioctl MII Interface */
 279 static int gfar_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 280 {
 281         struct gfar_private *priv = netdev_priv(dev);
 282
 283         if (!netif_running(dev))
 284                 return -EINVAL;
 285
 286         if (!priv->phydev)
 287                 return -ENODEV;
 288
 289         return phy_mii_ioctl(priv->phydev, if_mii(rq), cmd);
 290 }
 291
 292 /* Set up the ethernet device structure, private data,
 293  * and anything else we need before we start */
 294 static int gfar_probe(struct of_device *ofdev,
 295                 const struct of_device_id *match)
 296 {
 297         u32 tempval;
 298         struct net_device *dev = NULL;
 299         struct gfar_private *priv = NULL;
 300         DECLARE_MAC_BUF(mac);
 301         int err = 0;
 302         int len_devname;
 303
 304         /* Create an ethernet device instance */
 305         dev = alloc_etherdev(sizeof (*priv));
 306
 307         if (NULL == dev)
 308                 return -ENOMEM;
 309
 310         priv = netdev_priv(dev);
 311         priv->ndev = dev;
 312         priv->ofdev = ofdev;
 313         priv->node = ofdev->node;
 314         SET_NETDEV_DEV(dev, &ofdev->dev);
 315
 316         err = gfar_of_init(dev);
 317
 318         if (err)
 319                 goto regs_fail;
 320
 321         spin_lock_init(&priv->txlock);
 322         spin_lock_init(&priv->rxlock);
 323         spin_lock_init(&priv->bflock);
 324         INIT_WORK(&priv->reset_task, gfar_reset_task);
 325
 326         dev_set_drvdata(&ofdev->dev, priv);
 327
 328         /* Stop the DMA engine now, in case it was running before */
 329         /* (The firmware could have used it, and left it running). */
 330         gfar_halt(dev);
 331
 332         /* Reset MAC layer */
 333         gfar_write(&priv->regs->maccfg1, MACCFG1_SOFT_RESET);
 334
 335         /* We need to delay at least 3 TX clocks */
 336         udelay(2);
 337
 338         tempval = (MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
 339         gfar_write(&priv->regs->maccfg1, tempval);
 340
 341         /* Initialize MACCFG2. */
 342         gfar_write(&priv->regs->maccfg2, MACCFG2_INIT_SETTINGS);
 343
 344         /* Initialize ECNTRL */
 345         gfar_write(&priv->regs->ecntrl, ECNTRL_INIT_SETTINGS);
 346
 347         /* Set the dev->base_addr to the gfar reg region */
 348         dev->base_addr = (unsigned long) (priv->regs);
 349
 350         SET_NETDEV_DEV(dev, &ofdev->dev);
 351
 352         /* Fill in the dev structure */
 353         dev->watchdog_timeo = TX_TIMEOUT;
 354         netif_napi_add(dev, &priv->napi, gfar_poll, GFAR_DEV_WEIGHT);
 355         dev->mtu = 1500;
 356
 357         dev->netdev_ops = &gfar_netdev_ops;
 358         dev->ethtool_ops = &gfar_ethtool_ops;
 359
 360         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_CSUM) {
 361                 priv->rx_csum_enable = 1;
 362                 dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA;
 363         } else
 364                 priv->rx_csum_enable = 0;
 365
 366         priv->vlgrp = NULL;
 367
 368         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_VLAN)
 369                 dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
 370
 371         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_EXTENDED_HASH) {
 372                 priv->extended_hash = 1;
 373                 priv->hash_width = 9;
 374
 375                 priv->hash_regs[0] = &priv->regs->igaddr0;
 376                 priv->hash_regs[1] = &priv->regs->igaddr1;
 377                 priv->hash_regs[2] = &priv->regs->igaddr2;
 378                 priv->hash_regs[3] = &priv->regs->igaddr3;
 379                 priv->hash_regs[4] = &priv->regs->igaddr4;
 380                 priv->hash_regs[5] = &priv->regs->igaddr5;
 381                 priv->hash_regs[6] = &priv->regs->igaddr6;
 382                 priv->hash_regs[7] = &priv->regs->igaddr7;
 383                 priv->hash_regs[8] = &priv->regs->gaddr0;
 384                 priv->hash_regs[9] = &priv->regs->gaddr1;
 385                 priv->hash_regs[10] = &priv->regs->gaddr2;
 386                 priv->hash_regs[11] = &priv->regs->gaddr3;
 387                 priv->hash_regs[12] = &priv->regs->gaddr4;
 388                 priv->hash_regs[13] = &priv->regs->gaddr5;
 389                 priv->hash_regs[14] = &priv->regs->gaddr6;
 390                 priv->hash_regs[15] = &priv->regs->gaddr7;
 391
 392         } else {
 393                 priv->extended_hash = 0;
 394                 priv->hash_width = 8;
 395
 396                 priv->hash_regs[0] = &priv->regs->gaddr0;
 397                 priv->hash_regs[1] = &priv->regs->gaddr1;
 398                 priv->hash_regs[2] = &priv->regs->gaddr2;
 399                 priv->hash_regs[3] = &priv->regs->gaddr3;
 400                 priv->hash_regs[4] = &priv->regs->gaddr4;
 401                 priv->hash_regs[5] = &priv->regs->gaddr5;
 402                 priv->hash_regs[6] = &priv->regs->gaddr6;
 403                 priv->hash_regs[7] = &priv->regs->gaddr7;
 404         }
 405
 406         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_PADDING)
 407                 priv->padding = DEFAULT_PADDING;
 408         else
 409                 priv->padding = 0;
 410
 411         if (dev->features & NETIF_F_IP_CSUM)
 412                 dev->hard_header_len += GMAC_FCB_LEN;
 413
 414         priv->rx_buffer_size = DEFAULT_RX_BUFFER_SIZE;
 415         priv->tx_ring_size = DEFAULT_TX_RING_SIZE;
 416         priv->rx_ring_size = DEFAULT_RX_RING_SIZE;
 417         priv->num_txbdfree = DEFAULT_TX_RING_SIZE;
 418
 419         priv->txcoalescing = DEFAULT_TX_COALESCE;
 420         priv->txic = DEFAULT_TXIC;
 421         priv->rxcoalescing = DEFAULT_RX_COALESCE;
 422         priv->rxic = DEFAULT_RXIC;
 423
 424         /* Enable most messages by default */
 425         priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
 426
 427         /* Carrier starts down, phylib will bring it up */
 428         netif_carrier_off(dev);
 429
 430         err = register_netdev(dev);
 431
 432         if (err) {
 433                 printk(KERN_ERR "%s: Cannot register net device, aborting.\n",
 434                                 dev->name);
 435                 goto register_fail;
 436         }
 437
 438         device_init_wakeup(&dev->dev,
 439                 priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
 440
 441         /* fill out IRQ number and name fields */
 442         len_devname = strlen(dev->name);
 443         strncpy(&priv->int_name_tx[0], dev->name, len_devname);
 444         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 445                 strncpy(&priv->int_name_tx[len_devname],
 446                         "_tx", sizeof("_tx") + 1);
 447
 448                 strncpy(&priv->int_name_rx[0], dev->name, len_devname);
 449                 strncpy(&priv->int_name_rx[len_devname],
 450                         "_rx", sizeof("_rx") + 1);
 451
 452                 strncpy(&priv->int_name_er[0], dev->name, len_devname);
 453                 strncpy(&priv->int_name_er[len_devname],
 454                         "_er", sizeof("_er") + 1);
 455         } else
 456                 priv->int_name_tx[len_devname] = '\0';
 457
 458         /* Create all the sysfs files */
 459         gfar_init_sysfs(dev);
 460
 461         /* Print out the device info */
 462         printk(KERN_INFO DEVICE_NAME "%pM\n", dev->name, dev->dev_addr);
 463
 464         /* Even more device info helps when determining which kernel */
 465         /* provided which set of benchmarks. */
 466         printk(KERN_INFO "%s: Running with NAPI enabled\n", dev->name);
 467         printk(KERN_INFO "%s: %d/%d RX/TX BD ring size\n",
 468                dev->name, priv->rx_ring_size, priv->tx_ring_size);
 469
 470         return 0;
 471
 472 register_fail:
 473         iounmap(priv->regs);
 474 regs_fail:
 475         if (priv->phy_node)
 476                 of_node_put(priv->phy_node);
 477         if (priv->tbi_node)
 478                 of_node_put(priv->tbi_node);
 479         free_netdev(dev);
 480         return err;
 481 }
 482
 483 static int gfar_remove(struct of_device *ofdev)
 484 {
 485         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 486
 487         if (priv->phy_node)
 488                 of_node_put(priv->phy_node);
 489         if (priv->tbi_node)
 490                 of_node_put(priv->tbi_node);
 491
 492         dev_set_drvdata(&ofdev->dev, NULL);
 493
 494         iounmap(priv->regs);
 495         free_netdev(priv->ndev);
 496
 497         return 0;
 498 }
 499
 500 #ifdef CONFIG_PM
 501 static int gfar_suspend(struct of_device *ofdev, pm_message_t state)
 502 {
 503         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 504         struct net_device *dev = priv->ndev;
 505         unsigned long flags;
 506         u32 tempval;
 507
 508         int magic_packet = priv->wol_en &&
 509                 (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
 510
 511         netif_device_detach(dev);
 512
 513         if (netif_running(dev)) {
 514                 spin_lock_irqsave(&priv->txlock, flags);
 515                 spin_lock(&priv->rxlock);
 516
 517                 gfar_halt_nodisable(dev);
 518
 519                 /* Disable Tx, and Rx if wake-on-LAN is disabled. */
 520                 tempval = gfar_read(&priv->regs->maccfg1);
 521
 522                 tempval &= ~MACCFG1_TX_EN;
 523
 524                 if (!magic_packet)
 525                         tempval &= ~MACCFG1_RX_EN;
 526
 527                 gfar_write(&priv->regs->maccfg1, tempval);
 528
 529                 spin_unlock(&priv->rxlock);
 530                 spin_unlock_irqrestore(&priv->txlock, flags);
 531
 532                 napi_disable(&priv->napi);
 533
 534                 if (magic_packet) {
 535                         /* Enable interrupt on Magic Packet */
 536                         gfar_write(&priv->regs->imask, IMASK_MAG);
 537
 538                         /* Enable Magic Packet mode */
 539                         tempval = gfar_read(&priv->regs->maccfg2);
 540                         tempval |= MACCFG2_MPEN;
 541                         gfar_write(&priv->regs->maccfg2, tempval);
 542                 } else {
 543                         phy_stop(priv->phydev);
 544                 }
 545         }
 546
 547         return 0;
 548 }
 549
 550 static int gfar_resume(struct of_device *ofdev)
 551 {
 552         struct gfar_private *priv = dev_get_drvdata(&ofdev->dev);
 553         struct net_device *dev = priv->ndev;
 554         unsigned long flags;
 555         u32 tempval;
 556         int magic_packet = priv->wol_en &&
 557                 (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
 558
 559         if (!netif_running(dev)) {
 560                 netif_device_attach(dev);
 561                 return 0;
 562         }
 563
 564         if (!magic_packet && priv->phydev)
 565                 phy_start(priv->phydev);
 566
 567         /* Disable Magic Packet mode, in case something
 568          * else woke us up.
 569          */
 570
 571         spin_lock_irqsave(&priv->txlock, flags);
 572         spin_lock(&priv->rxlock);
 573
 574         tempval = gfar_read(&priv->regs->maccfg2);
 575         tempval &= ~MACCFG2_MPEN;
 576         gfar_write(&priv->regs->maccfg2, tempval);
 577
 578         gfar_start(dev);
 579
 580         spin_unlock(&priv->rxlock);
 581         spin_unlock_irqrestore(&priv->txlock, flags);
 582
 583         netif_device_attach(dev);
 584
 585         napi_enable(&priv->napi);
 586
 587         return 0;
 588 }
 589 #else
 590 #define gfar_suspend NULL
 591 #define gfar_resume NULL
 592 #endif
 593
 594 /* Reads the controller's registers to determine what interface
 595  * connects it to the PHY.
 596  */
 597 static phy_interface_t gfar_get_interface(struct net_device *dev)
 598 {
 599         struct gfar_private *priv = netdev_priv(dev);
 600         u32 ecntrl = gfar_read(&priv->regs->ecntrl);
 601
 602         if (ecntrl & ECNTRL_SGMII_MODE)
 603                 return PHY_INTERFACE_MODE_SGMII;
 604
 605         if (ecntrl & ECNTRL_TBI_MODE) {
 606                 if (ecntrl & ECNTRL_REDUCED_MODE)
 607                         return PHY_INTERFACE_MODE_RTBI;
 608                 else
 609                         return PHY_INTERFACE_MODE_TBI;
 610         }
 611
 612         if (ecntrl & ECNTRL_REDUCED_MODE) {
 613                 if (ecntrl & ECNTRL_REDUCED_MII_MODE)
 614                         return PHY_INTERFACE_MODE_RMII;
 615                 else {
 616                         phy_interface_t interface = priv->interface;
 617
 618                         /*
 619                          * This isn't autodetected right now, so it must
 620                          * be set by the device tree or platform code.
 621                          */
 622                         if (interface == PHY_INTERFACE_MODE_RGMII_ID)
 623                                 return PHY_INTERFACE_MODE_RGMII_ID;
 624
 625                         return PHY_INTERFACE_MODE_RGMII;
 626                 }
 627         }
 628
 629         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT)
 630                 return PHY_INTERFACE_MODE_GMII;
 631
 632         return PHY_INTERFACE_MODE_MII;
 633 }
 634
 635
 636 /* Initializes driver's PHY state, and attaches to the PHY.
 637  * Returns 0 on success.
 638  */
 639 static int init_phy(struct net_device *dev)
 640 {
 641         struct gfar_private *priv = netdev_priv(dev);
 642         uint gigabit_support =
 643                 priv->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT ?
 644                 SUPPORTED_1000baseT_Full : 0;
 645         phy_interface_t interface;
 646
 647         priv->oldlink = 0;
 648         priv->oldspeed = 0;
 649         priv->oldduplex = -1;
 650
 651         interface = gfar_get_interface(dev);
 652
 653         priv->phydev = of_phy_connect(dev, priv->phy_node, &adjust_link, 0,
 654                                       interface);
 655         if (!priv->phydev)
 656                 priv->phydev = of_phy_connect_fixed_link(dev, &adjust_link,
 657                                                          interface);
 658         if (!priv->phydev) {
 659                 dev_err(&dev->dev, "could not attach to PHY\n");
 660                 return -ENODEV;
 661         }
 662
 663         if (interface == PHY_INTERFACE_MODE_SGMII)
 664                 gfar_configure_serdes(dev);
 665
 666         /* Remove any features not supported by the controller */
 667         priv->phydev->supported &= (GFAR_SUPPORTED | gigabit_support);
 668         priv->phydev->advertising = priv->phydev->supported;
 669
 670         return 0;
 671 }
 672
 673 /*
 674  * Initialize TBI PHY interface for communicating with the
 675  * SERDES lynx PHY on the chip.  We communicate with this PHY
 676  * through the MDIO bus on each controller, treating it as a
 677  * "normal" PHY at the address found in the TBIPA register.  We assume
 678  * that the TBIPA register is valid.  Either the MDIO bus code will set
 679  * it to a value that doesn't conflict with other PHYs on the bus, or the
 680  * value doesn't matter, as there are no other PHYs on the bus.
 681  */
 682 static void gfar_configure_serdes(struct net_device *dev)
 683 {
 684         struct gfar_private *priv = netdev_priv(dev);
 685         struct phy_device *tbiphy;
 686
 687         if (!priv->tbi_node) {
 688                 dev_warn(&dev->dev, "error: SGMII mode requires that the "
 689                                     "device tree specify a tbi-handle\n");
 690                 return;
 691         }
 692
 693         tbiphy = of_phy_find_device(priv->tbi_node);
 694         if (!tbiphy) {
 695                 dev_err(&dev->dev, "error: Could not get TBI device\n");
 696                 return;
 697         }
 698
 699         /*
 700          * If the link is already up, we must already be ok, and don't need to
 701          * configure and reset the TBI<->SerDes link.  Maybe U-Boot configured
 702          * everything for us?  Resetting it takes the link down and requires
 703          * several seconds for it to come back.
 704          */
 705         if (phy_read(tbiphy, MII_BMSR) & BMSR_LSTATUS)
 706                 return;
 707
 708         /* Single clk mode, mii mode off(for serdes communication) */
 709         phy_write(tbiphy, MII_TBICON, TBICON_CLK_SELECT);
 710
 711         phy_write(tbiphy, MII_ADVERTISE,
 712                         ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
 713                         ADVERTISE_1000XPSE_ASYM);
 714
 715         phy_write(tbiphy, MII_BMCR, BMCR_ANENABLE |
 716                         BMCR_ANRESTART | BMCR_FULLDPLX | BMCR_SPEED1000);
 717 }
 718
 719 static void init_registers(struct net_device *dev)
 720 {
 721         struct gfar_private *priv = netdev_priv(dev);
 722
 723         /* Clear IEVENT */
 724         gfar_write(&priv->regs->ievent, IEVENT_INIT_CLEAR);
 725
 726         /* Initialize IMASK */
 727         gfar_write(&priv->regs->imask, IMASK_INIT_CLEAR);
 728
 729         /* Init hash registers to zero */
 730         gfar_write(&priv->regs->igaddr0, 0);
 731         gfar_write(&priv->regs->igaddr1, 0);
 732         gfar_write(&priv->regs->igaddr2, 0);
 733         gfar_write(&priv->regs->igaddr3, 0);
 734         gfar_write(&priv->regs->igaddr4, 0);
 735         gfar_write(&priv->regs->igaddr5, 0);
 736         gfar_write(&priv->regs->igaddr6, 0);
 737         gfar_write(&priv->regs->igaddr7, 0);
 738
 739         gfar_write(&priv->regs->gaddr0, 0);
 740         gfar_write(&priv->regs->gaddr1, 0);
 741         gfar_write(&priv->regs->gaddr2, 0);
 742         gfar_write(&priv->regs->gaddr3, 0);
 743         gfar_write(&priv->regs->gaddr4, 0);
 744         gfar_write(&priv->regs->gaddr5, 0);
 745         gfar_write(&priv->regs->gaddr6, 0);
 746         gfar_write(&priv->regs->gaddr7, 0);
 747
 748         /* Zero out the rmon mib registers if it has them */
 749         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
 750                 memset_io(&(priv->regs->rmon), 0, sizeof (struct rmon_mib));
 751
 752                 /* Mask off the CAM interrupts */
 753                 gfar_write(&priv->regs->rmon.cam1, 0xffffffff);
 754                 gfar_write(&priv->regs->rmon.cam2, 0xffffffff);
 755         }
 756
 757         /* Initialize the max receive buffer length */
 758         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
 759
 760         /* Initialize the Minimum Frame Length Register */
 761         gfar_write(&priv->regs->minflr, MINFLR_INIT_SETTINGS);
 762 }
 763
 764
 765 /* Halt the receive and transmit queues */
 766 static void gfar_halt_nodisable(struct net_device *dev)
 767 {
 768         struct gfar_private *priv = netdev_priv(dev);
 769         struct gfar __iomem *regs = priv->regs;
 770         u32 tempval;
 771
 772         /* Mask all interrupts */
 773         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 774
 775         /* Clear all interrupts */
 776         gfar_write(&regs->ievent, IEVENT_INIT_CLEAR);
 777
 778         /* Stop the DMA, and wait for it to stop */
 779         tempval = gfar_read(&priv->regs->dmactrl);
 780         if ((tempval & (DMACTRL_GRS | DMACTRL_GTS))
 781             != (DMACTRL_GRS | DMACTRL_GTS)) {
 782                 tempval |= (DMACTRL_GRS | DMACTRL_GTS);
 783                 gfar_write(&priv->regs->dmactrl, tempval);
 784
 785                 while (!(gfar_read(&priv->regs->ievent) &
 786                          (IEVENT_GRSC | IEVENT_GTSC)))
 787                         cpu_relax();
 788         }
 789 }
 790
 791 /* Halt the receive and transmit queues */
 792 void gfar_halt(struct net_device *dev)
 793 {
 794         struct gfar_private *priv = netdev_priv(dev);
 795         struct gfar __iomem *regs = priv->regs;
 796         u32 tempval;
 797
 798         gfar_halt_nodisable(dev);
 799
 800         /* Disable Rx and Tx */
 801         tempval = gfar_read(&regs->maccfg1);
 802         tempval &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
 803         gfar_write(&regs->maccfg1, tempval);
 804 }
 805
 806 void stop_gfar(struct net_device *dev)
 807 {
 808         struct gfar_private *priv = netdev_priv(dev);
 809         struct gfar __iomem *regs = priv->regs;
 810         unsigned long flags;
 811
 812         phy_stop(priv->phydev);
 813
 814         /* Lock it down */
 815         spin_lock_irqsave(&priv->txlock, flags);
 816         spin_lock(&priv->rxlock);
 817
 818         gfar_halt(dev);
 819
 820         spin_unlock(&priv->rxlock);
 821         spin_unlock_irqrestore(&priv->txlock, flags);
 822
 823         /* Free the IRQs */
 824         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
 825                 free_irq(priv->interruptError, dev);
 826                 free_irq(priv->interruptTransmit, dev);
 827                 free_irq(priv->interruptReceive, dev);
 828         } else {
 829                 free_irq(priv->interruptTransmit, dev);
 830         }
 831
 832         free_skb_resources(priv);
 833
 834         dma_free_coherent(&priv->ofdev->dev,
 835                         sizeof(struct txbd8)*priv->tx_ring_size
 836                         + sizeof(struct rxbd8)*priv->rx_ring_size,
 837                         priv->tx_bd_base,
 838                         gfar_read(&regs->tbase0));
 839 }
 840
 841 /* If there are any tx skbs or rx skbs still around, free them.
 842  * Then free tx_skbuff and rx_skbuff */
 843 static void free_skb_resources(struct gfar_private *priv)
 844 {
 845         struct rxbd8 *rxbdp;
 846         struct txbd8 *txbdp;
 847         int i, j;
 848
 849         /* Go through all the buffer descriptors and free their data buffers */
 850         txbdp = priv->tx_bd_base;
 851
 852         for (i = 0; i < priv->tx_ring_size; i++) {
 853                 if (!priv->tx_skbuff[i])
 854                         continue;
 855
 856                 dma_unmap_single(&priv->ofdev->dev, txbdp->bufPtr,
 857                                 txbdp->length, DMA_TO_DEVICE);
 858                 txbdp->lstatus = 0;
 859                 for (j = 0; j < skb_shinfo(priv->tx_skbuff[i])->nr_frags; j++) {
 860                         txbdp++;
 861                         dma_unmap_page(&priv->ofdev->dev, txbdp->bufPtr,
 862                                         txbdp->length, DMA_TO_DEVICE);
 863                 }
 864                 txbdp++;
 865                 dev_kfree_skb_any(priv->tx_skbuff[i]);
 866                 priv->tx_skbuff[i] = NULL;
 867         }
 868
 869         kfree(priv->tx_skbuff);
 870
 871         rxbdp = priv->rx_bd_base;
 872
 873         /* rx_skbuff is not guaranteed to be allocated, so only
 874          * free it and its contents if it is allocated */
 875         if(priv->rx_skbuff != NULL) {
 876                 for (i = 0; i < priv->rx_ring_size; i++) {
 877                         if (priv->rx_skbuff[i]) {
 878                                 dma_unmap_single(&priv->ofdev->dev, rxbdp->bufPtr,
 879                                                 priv->rx_buffer_size,
 880                                                 DMA_FROM_DEVICE);
 881
 882                                 dev_kfree_skb_any(priv->rx_skbuff[i]);
 883                                 priv->rx_skbuff[i] = NULL;
 884                         }
 885
 886                         rxbdp->lstatus = 0;
 887                         rxbdp->bufPtr = 0;
 888
 889                         rxbdp++;
 890                 }
 891
 892                 kfree(priv->rx_skbuff);
 893         }
 894 }
 895
 896 void gfar_start(struct net_device *dev)
 897 {
 898         struct gfar_private *priv = netdev_priv(dev);
 899         struct gfar __iomem *regs = priv->regs;
 900         u32 tempval;
 901
 902         /* Enable Rx and Tx in MACCFG1 */
 903         tempval = gfar_read(&regs->maccfg1);
 904         tempval |= (MACCFG1_RX_EN | MACCFG1_TX_EN);
 905         gfar_write(&regs->maccfg1, tempval);
 906
 907         /* Initialize DMACTRL to have WWR and WOP */
 908         tempval = gfar_read(&priv->regs->dmactrl);
 909         tempval |= DMACTRL_INIT_SETTINGS;
 910         gfar_write(&priv->regs->dmactrl, tempval);
 911
 912         /* Make sure we aren't stopped */
 913         tempval = gfar_read(&priv->regs->dmactrl);
 914         tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
 915         gfar_write(&priv->regs->dmactrl, tempval);
 916
 917         /* Clear THLT/RHLT, so that the DMA starts polling now */
 918         gfar_write(&regs->tstat, TSTAT_CLEAR_THALT);
 919         gfar_write(&regs->rstat, RSTAT_CLEAR_RHALT);
 920
 921         /* Unmask the interrupts we look for */
 922         gfar_write(&regs->imask, IMASK_DEFAULT);
 923
 924         dev->trans_start = jiffies;
 925 }
 926
 927 /* Bring the controller up and running */
 928 int startup_gfar(struct net_device *dev)
 929 {
 930         struct txbd8 *txbdp;
 931         struct rxbd8 *rxbdp;
 932         dma_addr_t addr = 0;
 933         unsigned long vaddr;
 934         int i;
 935         struct gfar_private *priv = netdev_priv(dev);
 936         struct gfar __iomem *regs = priv->regs;
 937         int err = 0;
 938         u32 rctrl = 0;
 939         u32 tctrl = 0;
 940         u32 attrs = 0;
 941
 942         gfar_write(&regs->imask, IMASK_INIT_CLEAR);
 943
 944         /* Allocate memory for the buffer descriptors */
 945         vaddr = (unsigned long) dma_alloc_coherent(&priv->ofdev->dev,
 946                         sizeof (struct txbd8) * priv->tx_ring_size +
 947                         sizeof (struct rxbd8) * priv->rx_ring_size,
 948                         &addr, GFP_KERNEL);
 949
 950         if (vaddr == 0) {
 951                 if (netif_msg_ifup(priv))
 952                         printk(KERN_ERR "%s: Could not allocate buffer descriptors!\n",
 953                                         dev->name);
 954                 return -ENOMEM;
 955         }
 956
 957         priv->tx_bd_base = (struct txbd8 *) vaddr;
 958
 959         /* enet DMA only understands physical addresses */
 960         gfar_write(&regs->tbase0, addr);
 961
 962         /* Start the rx descriptor ring where the tx ring leaves off */
 963         addr = addr + sizeof (struct txbd8) * priv->tx_ring_size;
 964         vaddr = vaddr + sizeof (struct txbd8) * priv->tx_ring_size;
 965         priv->rx_bd_base = (struct rxbd8 *) vaddr;
 966         gfar_write(&regs->rbase0, addr);
 967
 968         /* Setup the skbuff rings */
 969         priv->tx_skbuff =
 970             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 971                                         priv->tx_ring_size, GFP_KERNEL);
 972
 973         if (NULL == priv->tx_skbuff) {
 974                 if (netif_msg_ifup(priv))
 975                         printk(KERN_ERR "%s: Could not allocate tx_skbuff\n",
 976                                         dev->name);
 977                 err = -ENOMEM;
 978                 goto tx_skb_fail;
 979         }
 980
 981         for (i = 0; i < priv->tx_ring_size; i++)
 982                 priv->tx_skbuff[i] = NULL;
 983
 984         priv->rx_skbuff =
 985             (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
 986                                         priv->rx_ring_size, GFP_KERNEL);
 987
 988         if (NULL == priv->rx_skbuff) {
 989                 if (netif_msg_ifup(priv))
 990                         printk(KERN_ERR "%s: Could not allocate rx_skbuff\n",
 991                                         dev->name);
 992                 err = -ENOMEM;
 993                 goto rx_skb_fail;
 994         }
 995
 996         for (i = 0; i < priv->rx_ring_size; i++)
 997                 priv->rx_skbuff[i] = NULL;
 998
 999         /* Initialize some variables in our dev structure */
1000         priv->num_txbdfree = priv->tx_ring_size;
1001         priv->dirty_tx = priv->cur_tx = priv->tx_bd_base;
1002         priv->cur_rx = priv->rx_bd_base;
1003         priv->skb_curtx = priv->skb_dirtytx = 0;
1004         priv->skb_currx = 0;
1005
1006         /* Initialize Transmit Descriptor Ring */
1007         txbdp = priv->tx_bd_base;
1008         for (i = 0; i < priv->tx_ring_size; i++) {
1009                 txbdp->lstatus = 0;
1010                 txbdp->bufPtr = 0;
1011                 txbdp++;
1012         }
1013
1014         /* Set the last descriptor in the ring to indicate wrap */
1015         txbdp--;
1016         txbdp->status |= TXBD_WRAP;
1017
1018         rxbdp = priv->rx_bd_base;
1019         for (i = 0; i < priv->rx_ring_size; i++) {
1020                 struct sk_buff *skb;
1021
1022                 skb = gfar_new_skb(dev);
1023
1024                 if (!skb) {
1025                         printk(KERN_ERR "%s: Can't allocate RX buffers\n",
1026                                         dev->name);
1027
1028                         goto err_rxalloc_fail;
1029                 }
1030
1031                 priv->rx_skbuff[i] = skb;
1032
1033                 gfar_new_rxbdp(dev, rxbdp, skb);
1034
1035                 rxbdp++;
1036         }
1037
1038         /* Set the last descriptor in the ring to wrap */
1039         rxbdp--;
1040         rxbdp->status |= RXBD_WRAP;
1041
1042         /* If the device has multiple interrupts, register for
1043          * them.  Otherwise, only register for the one */
1044         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
1045                 /* Install our interrupt handlers for Error,
1046                  * Transmit, and Receive */
1047                 if (request_irq(priv->interruptError, gfar_error,
1048                                 0, priv->int_name_er, dev) < 0) {
1049                         if (netif_msg_intr(priv))
1050                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1051                                         dev->name, priv->interruptError);
1052
1053                         err = -1;
1054                         goto err_irq_fail;
1055                 }
1056
1057                 if (request_irq(priv->interruptTransmit, gfar_transmit,
1058                                 0, priv->int_name_tx, dev) < 0) {
1059                         if (netif_msg_intr(priv))
1060                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1061                                         dev->name, priv->interruptTransmit);
1062
1063                         err = -1;
1064
1065                         goto tx_irq_fail;
1066                 }
1067
1068                 if (request_irq(priv->interruptReceive, gfar_receive,
1069                                 0, priv->int_name_rx, dev) < 0) {
1070                         if (netif_msg_intr(priv))
1071                                 printk(KERN_ERR "%s: Can't get IRQ %d (receive0)\n",
1072                                                 dev->name, priv->interruptReceive);
1073
1074                         err = -1;
1075                         goto rx_irq_fail;
1076                 }
1077         } else {
1078                 if (request_irq(priv->interruptTransmit, gfar_interrupt,
1079                                 0, priv->int_name_tx, dev) < 0) {
1080                         if (netif_msg_intr(priv))
1081                                 printk(KERN_ERR "%s: Can't get IRQ %d\n",
1082                                         dev->name, priv->interruptTransmit);
1083
1084                         err = -1;
1085                         goto err_irq_fail;
1086                 }
1087         }
1088
1089         phy_start(priv->phydev);
1090
1091         /* Configure the coalescing support */
1092         gfar_write(&regs->txic, 0);
1093         if (priv->txcoalescing)
1094                 gfar_write(&regs->txic, priv->txic);
1095
1096         gfar_write(&regs->rxic, 0);
1097         if (priv->rxcoalescing)
1098                 gfar_write(&regs->rxic, priv->rxic);
1099
1100         if (priv->rx_csum_enable)
1101                 rctrl |= RCTRL_CHECKSUMMING;
1102
1103         if (priv->extended_hash) {
1104                 rctrl |= RCTRL_EXTHASH;
1105
1106                 gfar_clear_exact_match(dev);
1107                 rctrl |= RCTRL_EMEN;
1108         }
1109
1110         if (priv->padding) {
1111                 rctrl &= ~RCTRL_PAL_MASK;
1112                 rctrl |= RCTRL_PADDING(priv->padding);
1113         }
1114
1115         /* keep vlan related bits if it's enabled */
1116         if (priv->vlgrp) {
1117                 rctrl |= RCTRL_VLEX | RCTRL_PRSDEP_INIT;
1118                 tctrl |= TCTRL_VLINS;
1119         }
1120
1121         /* Init rctrl based on our settings */
1122         gfar_write(&priv->regs->rctrl, rctrl);
1123
1124         if (dev->features & NETIF_F_IP_CSUM)
1125                 tctrl |= TCTRL_INIT_CSUM;
1126
1127         gfar_write(&priv->regs->tctrl, tctrl);
1128
1129         /* Set the extraction length and index */
1130         attrs = ATTRELI_EL(priv->rx_stash_size) |
1131                 ATTRELI_EI(priv->rx_stash_index);
1132
1133         gfar_write(&priv->regs->attreli, attrs);
1134
1135         /* Start with defaults, and add stashing or locking
1136          * depending on the approprate variables */
1137         attrs = ATTR_INIT_SETTINGS;
1138
1139         if (priv->bd_stash_en)
1140                 attrs |= ATTR_BDSTASH;
1141
1142         if (priv->rx_stash_size != 0)
1143                 attrs |= ATTR_BUFSTASH;
1144
1145         gfar_write(&priv->regs->attr, attrs);
1146
1147         gfar_write(&priv->regs->fifo_tx_thr, priv->fifo_threshold);
1148         gfar_write(&priv->regs->fifo_tx_starve, priv->fifo_starve);
1149         gfar_write(&priv->regs->fifo_tx_starve_shutoff, priv->fifo_starve_off);
1150
1151         /* Start the controller */
1152         gfar_start(dev);
1153
1154         return 0;
1155
1156 rx_irq_fail:
1157         free_irq(priv->interruptTransmit, dev);
1158 tx_irq_fail:
1159         free_irq(priv->interruptError, dev);
1160 err_irq_fail:
1161 err_rxalloc_fail:
1162 rx_skb_fail:
1163         free_skb_resources(priv);
1164 tx_skb_fail:
1165         dma_free_coherent(&priv->ofdev->dev,
1166                         sizeof(struct txbd8)*priv->tx_ring_size
1167                         + sizeof(struct rxbd8)*priv->rx_ring_size,
1168                         priv->tx_bd_base,
1169                         gfar_read(&regs->tbase0));
1170
1171         return err;
1172 }
1173
1174 /* Called when something needs to use the ethernet device */
1175 /* Returns 0 for success. */
1176 static int gfar_enet_open(struct net_device *dev)
1177 {
1178         struct gfar_private *priv = netdev_priv(dev);
1179         int err;
1180
1181         napi_enable(&priv->napi);
1182
1183         skb_queue_head_init(&priv->rx_recycle);
1184
1185         /* Initialize a bunch of registers */
1186         init_registers(dev);
1187
1188         gfar_set_mac_address(dev);
1189
1190         err = init_phy(dev);
1191
1192         if(err) {
1193                 napi_disable(&priv->napi);
1194                 return err;
1195         }
1196
1197         err = startup_gfar(dev);
1198         if (err) {
1199                 napi_disable(&priv->napi);
1200                 return err;
1201         }
1202
1203         netif_start_queue(dev);
1204
1205         device_set_wakeup_enable(&dev->dev, priv->wol_en);
1206
1207         return err;
1208 }
1209
1210 static inline struct txfcb *gfar_add_fcb(struct sk_buff *skb)
1211 {
1212         struct txfcb *fcb = (struct txfcb *)skb_push(skb, GMAC_FCB_LEN);
1213
1214         memset(fcb, 0, GMAC_FCB_LEN);
1215
1216         return fcb;
1217 }
1218
1219 static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb)
1220 {
1221         u8 flags = 0;
1222
1223         /* If we're here, it's a IP packet with a TCP or UDP
1224          * payload.  We set it to checksum, using a pseudo-header
1225          * we provide
1226          */
1227         flags = TXFCB_DEFAULT;
1228
1229         /* Tell the controller what the protocol is */
1230         /* And provide the already calculated phcs */
1231         if (ip_hdr(skb)->protocol == IPPROTO_UDP) {
1232                 flags |= TXFCB_UDP;
1233                 fcb->phcs = udp_hdr(skb)->check;
1234         } else
1235                 fcb->phcs = tcp_hdr(skb)->check;
1236
1237         /* l3os is the distance between the start of the
1238          * frame (skb->data) and the start of the IP hdr.
1239          * l4os is the distance between the start of the
1240          * l3 hdr and the l4 hdr */
1241         fcb->l3os = (u16)(skb_network_offset(skb) - GMAC_FCB_LEN);
1242         fcb->l4os = skb_network_header_len(skb);
1243
1244         fcb->flags = flags;
1245 }
1246
1247 void inline gfar_tx_vlan(struct sk_buff *skb, struct txfcb *fcb)
1248 {
1249         fcb->flags |= TXFCB_VLN;
1250         fcb->vlctl = vlan_tx_tag_get(skb);
1251 }
1252
1253 static inline struct txbd8 *skip_txbd(struct txbd8 *bdp, int stride,
1254                                struct txbd8 *base, int ring_size)
1255 {
1256         struct txbd8 *new_bd = bdp + stride;
1257
1258         return (new_bd >= (base + ring_size)) ? (new_bd - ring_size) : new_bd;
1259 }
1260
1261 static inline struct txbd8 *next_txbd(struct txbd8 *bdp, struct txbd8 *base,
1262                 int ring_size)
1263 {
1264         return skip_txbd(bdp, 1, base, ring_size);
1265 }
1266
1267 /* This is called by the kernel when a frame is ready for transmission. */
1268 /* It is pointed to by the dev->hard_start_xmit function pointer */
1269 static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
1270 {
1271         struct gfar_private *priv = netdev_priv(dev);
1272         struct txfcb *fcb = NULL;
1273         struct txbd8 *txbdp, *txbdp_start, *base;
1274         u32 lstatus;
1275         int i;
1276         u32 bufaddr;
1277         unsigned long flags;
1278         unsigned int nr_frags, length;
1279
1280         base = priv->tx_bd_base;
1281
1282         /* make space for additional header when fcb is needed */
1283         if (((skb->ip_summed == CHECKSUM_PARTIAL) ||
1284                         (priv->vlgrp && vlan_tx_tag_present(skb))) &&
1285                         (skb_headroom(skb) < GMAC_FCB_LEN)) {
1286                 struct sk_buff *skb_new;
1287
1288                 skb_new = skb_realloc_headroom(skb, GMAC_FCB_LEN);
1289                 if (!skb_new) {
1290                         dev->stats.tx_errors++;
1291                         kfree_skb(skb);
1292                         return NETDEV_TX_OK;
1293                 }
1294                 kfree_skb(skb);
1295                 skb = skb_new;
1296         }
1297
1298         /* total number of fragments in the SKB */
1299         nr_frags = skb_shinfo(skb)->nr_frags;
1300
1301         spin_lock_irqsave(&priv->txlock, flags);
1302
1303         /* check if there is space to queue this packet */
1304         if ((nr_frags+1) > priv->num_txbdfree) {
1305                 /* no space, stop the queue */
1306                 netif_stop_queue(dev);
1307                 dev->stats.tx_fifo_errors++;
1308                 spin_unlock_irqrestore(&priv->txlock, flags);
1309                 return NETDEV_TX_BUSY;
1310         }
1311
1312         /* Update transmit stats */
1313         dev->stats.tx_bytes += skb->len;
1314
1315         txbdp = txbdp_start = priv->cur_tx;
1316
1317         if (nr_frags == 0) {
1318                 lstatus = txbdp->lstatus | BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
1319         } else {
1320                 /* Place the fragment addresses and lengths into the TxBDs */
1321                 for (i = 0; i < nr_frags; i++) {
1322                         /* Point at the next BD, wrapping as needed */
1323                         txbdp = next_txbd(txbdp, base, priv->tx_ring_size);
1324
1325                         length = skb_shinfo(skb)->frags[i].size;
1326
1327                         lstatus = txbdp->lstatus | length |
1328                                 BD_LFLAG(TXBD_READY);
1329
1330                         /* Handle the last BD specially */
1331                         if (i == nr_frags - 1)
1332                                 lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
1333
1334                         bufaddr = dma_map_page(&priv->ofdev->dev,
1335                                         skb_shinfo(skb)->frags[i].page,
1336                                         skb_shinfo(skb)->frags[i].page_offset,
1337                                         length,
1338                                         DMA_TO_DEVICE);
1339
1340                         /* set the TxBD length and buffer pointer */
1341                         txbdp->bufPtr = bufaddr;
1342                         txbdp->lstatus = lstatus;
1343                 }
1344
1345                 lstatus = txbdp_start->lstatus;
1346         }
1347
1348         /* Set up checksumming */
1349         if (CHECKSUM_PARTIAL == skb->ip_summed) {
1350                 fcb = gfar_add_fcb(skb);
1351                 lstatus |= BD_LFLAG(TXBD_TOE);
1352                 gfar_tx_checksum(skb, fcb);
1353         }
1354
1355         if (priv->vlgrp && vlan_tx_tag_present(skb)) {
1356                 if (unlikely(NULL == fcb)) {
1357                         fcb = gfar_add_fcb(skb);
1358                         lstatus |= BD_LFLAG(TXBD_TOE);
1359                 }
1360
1361                 gfar_tx_vlan(skb, fcb);
1362         }
1363
1364         /* setup the TxBD length and buffer pointer for the first BD */
1365         priv->tx_skbuff[priv->skb_curtx] = skb;
1366         txbdp_start->bufPtr = dma_map_single(&priv->ofdev->dev, skb->data,
1367                         skb_headlen(skb), DMA_TO_DEVICE);
1368
1369         lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
1370
1371         /*
1372          * The powerpc-specific eieio() is used, as wmb() has too strong
1373          * semantics (it requires synchronization between cacheable and
1374          * uncacheable mappings, which eieio doesn't provide and which we
1375          * don't need), thus requiring a more expensive sync instruction.  At
1376          * some point, the set of architecture-independent barrier functions
1377          * should be expanded to include weaker barriers.
1378          */
1379         eieio();
1380
1381         txbdp_start->lstatus = lstatus;
1382
1383         /* Update the current skb pointer to the next entry we will use
1384          * (wrapping if necessary) */
1385         priv->skb_curtx = (priv->skb_curtx + 1) &
1386                 TX_RING_MOD_MASK(priv->tx_ring_size);
1387
1388         priv->cur_tx = next_txbd(txbdp, base, priv->tx_ring_size);
1389
1390         /* reduce TxBD free count */
1391         priv->num_txbdfree -= (nr_frags + 1);
1392
1393         dev->trans_start = jiffies;
1394
1395         /* If the next BD still needs to be cleaned up, then the bds
1396            are full.  We need to tell the kernel to stop sending us stuff. */
1397         if (!priv->num_txbdfree) {
1398                 netif_stop_queue(dev);
1399
1400                 dev->stats.tx_fifo_errors++;
1401         }
1402
1403         /* Tell the DMA to go go go */
1404         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
1405
1406         /* Unlock priv */
1407         spin_unlock_irqrestore(&priv->txlock, flags);
1408
1409         return NETDEV_TX_OK;
1410 }
1411
1412 /* Stops the kernel queue, and halts the controller */
1413 static int gfar_close(struct net_device *dev)
1414 {
1415         struct gfar_private *priv = netdev_priv(dev);
1416
1417         napi_disable(&priv->napi);
1418
1419         skb_queue_purge(&priv->rx_recycle);
1420         cancel_work_sync(&priv->reset_task);
1421         stop_gfar(dev);
1422
1423         /* Disconnect from the PHY */
1424         phy_disconnect(priv->phydev);
1425         priv->phydev = NULL;
1426
1427         netif_stop_queue(dev);
1428
1429         return 0;
1430 }
1431
1432 /* Changes the mac address if the controller is not running. */
1433 static int gfar_set_mac_address(struct net_device *dev)
1434 {
1435         gfar_set_mac_for_addr(dev, 0, dev->dev_addr);
1436
1437         return 0;
1438 }
1439
1440
1441 /* Enables and disables VLAN insertion/extraction */
1442 static void gfar_vlan_rx_register(struct net_device *dev,
1443                 struct vlan_group *grp)
1444 {
1445         struct gfar_private *priv = netdev_priv(dev);
1446         unsigned long flags;
1447         u32 tempval;
1448
1449         spin_lock_irqsave(&priv->rxlock, flags);
1450
1451         priv->vlgrp = grp;
1452
1453         if (grp) {
1454                 /* Enable VLAN tag insertion */
1455                 tempval = gfar_read(&priv->regs->tctrl);
1456                 tempval |= TCTRL_VLINS;
1457
1458                 gfar_write(&priv->regs->tctrl, tempval);
1459
1460                 /* Enable VLAN tag extraction */
1461                 tempval = gfar_read(&priv->regs->rctrl);
1462                 tempval |= (RCTRL_VLEX | RCTRL_PRSDEP_INIT);
1463                 gfar_write(&priv->regs->rctrl, tempval);
1464         } else {
1465                 /* Disable VLAN tag insertion */
1466                 tempval = gfar_read(&priv->regs->tctrl);
1467                 tempval &= ~TCTRL_VLINS;
1468                 gfar_write(&priv->regs->tctrl, tempval);
1469
1470                 /* Disable VLAN tag extraction */
1471                 tempval = gfar_read(&priv->regs->rctrl);
1472                 tempval &= ~RCTRL_VLEX;
1473                 /* If parse is no longer required, then disable parser */
1474                 if (tempval & RCTRL_REQ_PARSER)
1475                         tempval |= RCTRL_PRSDEP_INIT;
1476                 else
1477                         tempval &= ~RCTRL_PRSDEP_INIT;
1478                 gfar_write(&priv->regs->rctrl, tempval);
1479         }
1480
1481         gfar_change_mtu(dev, dev->mtu);
1482
1483         spin_unlock_irqrestore(&priv->rxlock, flags);
1484 }
1485
1486 static int gfar_change_mtu(struct net_device *dev, int new_mtu)
1487 {
1488         int tempsize, tempval;
1489         struct gfar_private *priv = netdev_priv(dev);
1490         int oldsize = priv->rx_buffer_size;
1491         int frame_size = new_mtu + ETH_HLEN;
1492
1493         if (priv->vlgrp)
1494                 frame_size += VLAN_HLEN;
1495
1496         if ((frame_size < 64) || (frame_size > JUMBO_FRAME_SIZE)) {
1497                 if (netif_msg_drv(priv))
1498                         printk(KERN_ERR "%s: Invalid MTU setting\n",
1499                                         dev->name);
1500                 return -EINVAL;
1501         }
1502
1503         if (gfar_uses_fcb(priv))
1504                 frame_size += GMAC_FCB_LEN;
1505
1506         frame_size += priv->padding;
1507
1508         tempsize =
1509             (frame_size & ~(INCREMENTAL_BUFFER_SIZE - 1)) +
1510             INCREMENTAL_BUFFER_SIZE;
1511
1512         /* Only stop and start the controller if it isn't already
1513          * stopped, and we changed something */
1514         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1515                 stop_gfar(dev);
1516
1517         priv->rx_buffer_size = tempsize;
1518
1519         dev->mtu = new_mtu;
1520
1521         gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
1522         gfar_write(&priv->regs->maxfrm, priv->rx_buffer_size);
1523
1524         /* If the mtu is larger than the max size for standard
1525          * ethernet frames (ie, a jumbo frame), then set maccfg2
1526          * to allow huge frames, and to check the length */
1527         tempval = gfar_read(&priv->regs->maccfg2);
1528
1529         if (priv->rx_buffer_size > DEFAULT_RX_BUFFER_SIZE)
1530                 tempval |= (MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1531         else
1532                 tempval &= ~(MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
1533
1534         gfar_write(&priv->regs->maccfg2, tempval);
1535
1536         if ((oldsize != tempsize) && (dev->flags & IFF_UP))
1537                 startup_gfar(dev);
1538
1539         return 0;
1540 }
1541
1542 /* gfar_reset_task gets scheduled when a packet has not been
1543  * transmitted after a set amount of time.
1544  * For now, assume that clearing out all the structures, and
1545  * starting over will fix the problem.
1546  */
1547 static void gfar_reset_task(struct work_struct *work)
1548 {
1549         struct gfar_private *priv = container_of(work, struct gfar_private,
1550                         reset_task);
1551         struct net_device *dev = priv->ndev;
1552
1553         if (dev->flags & IFF_UP) {
1554                 netif_stop_queue(dev);
1555                 stop_gfar(dev);
1556                 startup_gfar(dev);
1557                 netif_start_queue(dev);
1558         }
1559
1560         netif_tx_schedule_all(dev);
1561 }
1562
1563 static void gfar_timeout(struct net_device *dev)
1564 {
1565         struct gfar_private *priv = netdev_priv(dev);
1566
1567         dev->stats.tx_errors++;
1568         schedule_work(&priv->reset_task);
1569 }
1570
1571 /* Interrupt Handler for Transmit complete */
1572 static int gfar_clean_tx_ring(struct net_device *dev)
1573 {
1574         struct gfar_private *priv = netdev_priv(dev);
1575         struct txbd8 *bdp;
1576         struct txbd8 *lbdp = NULL;
1577         struct txbd8 *base = priv->tx_bd_base;
1578         struct sk_buff *skb;
1579         int skb_dirtytx;
1580         int tx_ring_size = priv->tx_ring_size;
1581         int frags = 0;
1582         int i;
1583         int howmany = 0;
1584         u32 lstatus;
1585
1586         bdp = priv->dirty_tx;
1587         skb_dirtytx = priv->skb_dirtytx;
1588
1589         while ((skb = priv->tx_skbuff[skb_dirtytx])) {
1590                 frags = skb_shinfo(skb)->nr_frags;
1591                 lbdp = skip_txbd(bdp, frags, base, tx_ring_size);
1592
1593                 lstatus = lbdp->lstatus;
1594
1595                 /* Only clean completed frames */
1596                 if ((lstatus & BD_LFLAG(TXBD_READY)) &&
1597                                 (lstatus & BD_LENGTH_MASK))
1598                         break;
1599
1600                 dma_unmap_single(&priv->ofdev->dev,
1601                                 bdp->bufPtr,
1602                                 bdp->length,
1603                                 DMA_TO_DEVICE);
1604
1605                 bdp->lstatus &= BD_LFLAG(TXBD_WRAP);
1606                 bdp = next_txbd(bdp, base, tx_ring_size);
1607
1608                 for (i = 0; i < frags; i++) {
1609                         dma_unmap_page(&priv->ofdev->dev,
1610                                         bdp->bufPtr,
1611                                         bdp->length,
1612                                         DMA_TO_DEVICE);
1613                         bdp->lstatus &= BD_LFLAG(TXBD_WRAP);
1614                         bdp = next_txbd(bdp, base, tx_ring_size);
1615                 }
1616
1617                 /*
1618                  * If there's room in the queue (limit it to rx_buffer_size)
1619                  * we add this skb back into the pool, if it's the right size
1620                  */
1621                 if (skb_queue_len(&priv->rx_recycle) < priv->rx_ring_size &&
1622                                 skb_recycle_check(skb, priv->rx_buffer_size +
1623                                         RXBUF_ALIGNMENT))
1624                         __skb_queue_head(&priv->rx_recycle, skb);
1625                 else
1626                         dev_kfree_skb_any(skb);
1627
1628                 priv->tx_skbuff[skb_dirtytx] = NULL;
1629
1630                 skb_dirtytx = (skb_dirtytx + 1) &
1631                         TX_RING_MOD_MASK(tx_ring_size);
1632
1633                 howmany++;
1634                 priv->num_txbdfree += frags + 1;
1635         }
1636
1637         /* If we freed a buffer, we can restart transmission, if necessary */
1638         if (netif_queue_stopped(dev) && priv->num_txbdfree)
1639                 netif_wake_queue(dev);
1640
1641         /* Update dirty indicators */
1642         priv->skb_dirtytx = skb_dirtytx;
1643         priv->dirty_tx = bdp;
1644
1645         dev->stats.tx_packets += howmany;
1646
1647         return howmany;
1648 }
1649
1650 static void gfar_schedule_cleanup(struct net_device *dev)
1651 {
1652         struct gfar_private *priv = netdev_priv(dev);
1653         unsigned long flags;
1654
1655         spin_lock_irqsave(&priv->txlock, flags);
1656         spin_lock(&priv->rxlock);
1657
1658         if (napi_schedule_prep(&priv->napi)) {
1659                 gfar_write(&priv->regs->imask, IMASK_RTX_DISABLED);
1660                 __napi_schedule(&priv->napi);
1661         } else {
1662                 /*
1663                  * Clear IEVENT, so interrupts aren't called again
1664                  * because of the packets that have already arrived.
1665                  */
1666                 gfar_write(&priv->regs->ievent, IEVENT_RTX_MASK);
1667         }
1668
1669         spin_unlock(&priv->rxlock);
1670         spin_unlock_irqrestore(&priv->txlock, flags);
1671 }
1672
1673 /* Interrupt Handler for Transmit complete */
1674 static irqreturn_t gfar_transmit(int irq, void *dev_id)
1675 {
1676         gfar_schedule_cleanup((struct net_device *)dev_id);
1677         return IRQ_HANDLED;
1678 }
1679
1680 static void gfar_new_rxbdp(struct net_device *dev, struct rxbd8 *bdp,
1681                 struct sk_buff *skb)
1682 {
1683         struct gfar_private *priv = netdev_priv(dev);
1684         u32 lstatus;
1685
1686         bdp->bufPtr = dma_map_single(&priv->ofdev->dev, skb->data,
1687                         priv->rx_buffer_size, DMA_FROM_DEVICE);
1688
1689         lstatus = BD_LFLAG(RXBD_EMPTY | RXBD_INTERRUPT);
1690
1691         if (bdp == priv->rx_bd_base + priv->rx_ring_size - 1)
1692                 lstatus |= BD_LFLAG(RXBD_WRAP);
1693
1694         eieio();
1695
1696         bdp->lstatus = lstatus;
1697 }
1698
1699
1700 struct sk_buff * gfar_new_skb(struct net_device *dev)
1701 {
1702         unsigned int alignamount;
1703         struct gfar_private *priv = netdev_priv(dev);
1704         struct sk_buff *skb = NULL;
1705
1706         skb = __skb_dequeue(&priv->rx_recycle);
1707         if (!skb)
1708                 skb = netdev_alloc_skb(dev,
1709                                 priv->rx_buffer_size + RXBUF_ALIGNMENT);
1710
1711         if (!skb)
1712                 return NULL;
1713
1714         alignamount = RXBUF_ALIGNMENT -
1715                 (((unsigned long) skb->data) & (RXBUF_ALIGNMENT - 1));
1716
1717         /* We need the data buffer to be aligned properly.  We will reserve
1718          * as many bytes as needed to align the data properly
1719          */
1720         skb_reserve(skb, alignamount);
1721
1722         return skb;
1723 }
1724
1725 static inline void count_errors(unsigned short status, struct net_device *dev)
1726 {
1727         struct gfar_private *priv = netdev_priv(dev);
1728         struct net_device_stats *stats = &dev->stats;
1729         struct gfar_extra_stats *estats = &priv->extra_stats;
1730
1731         /* If the packet was truncated, none of the other errors
1732          * matter */
1733         if (status & RXBD_TRUNCATED) {
1734                 stats->rx_length_errors++;
1735
1736                 estats->rx_trunc++;
1737
1738                 return;
1739         }
1740         /* Count the errors, if there were any */
1741         if (status & (RXBD_LARGE | RXBD_SHORT)) {
1742                 stats->rx_length_errors++;
1743
1744                 if (status & RXBD_LARGE)
1745                         estats->rx_large++;
1746                 else
1747                         estats->rx_short++;
1748         }
1749         if (status & RXBD_NONOCTET) {
1750                 stats->rx_frame_errors++;
1751                 estats->rx_nonoctet++;
1752         }
1753         if (status & RXBD_CRCERR) {
1754                 estats->rx_crcerr++;
1755                 stats->rx_crc_errors++;
1756         }
1757         if (status & RXBD_OVERRUN) {
1758                 estats->rx_overrun++;
1759                 stats->rx_crc_errors++;
1760         }
1761 }
1762
1763 irqreturn_t gfar_receive(int irq, void *dev_id)
1764 {
1765         gfar_schedule_cleanup((struct net_device *)dev_id);
1766         return IRQ_HANDLED;
1767 }
1768
1769 static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
1770 {
1771         /* If valid headers were found, and valid sums
1772          * were verified, then we tell the kernel that no
1773          * checksumming is necessary.  Otherwise, it is */
1774         if ((fcb->flags & RXFCB_CSUM_MASK) == (RXFCB_CIP | RXFCB_CTU))
1775                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1776         else
1777                 skb->ip_summed = CHECKSUM_NONE;
1778 }
1779
1780
1781 /* gfar_process_frame() -- handle one incoming packet if skb
1782  * isn't NULL.  */
1783 static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
1784                               int amount_pull)
1785 {
1786         struct gfar_private *priv = netdev_priv(dev);
1787         struct rxfcb *fcb = NULL;
1788
1789         int ret;
1790
1791         /* fcb is at the beginning if exists */
1792         fcb = (struct rxfcb *)skb->data;
1793
1794         /* Remove the FCB from the skb */
1795         /* Remove the padded bytes, if there are any */
1796         if (amount_pull)
1797                 skb_pull(skb, amount_pull);
1798
1799         if (priv->rx_csum_enable)
1800                 gfar_rx_checksum(skb, fcb);
1801
1802         /* Tell the skb what kind of packet this is */
1803         skb->protocol = eth_type_trans(skb, dev);
1804
1805         /* Send the packet up the stack */
1806         if (unlikely(priv->vlgrp && (fcb->flags & RXFCB_VLN)))
1807                 ret = vlan_hwaccel_receive_skb(skb, priv->vlgrp, fcb->vlctl);
1808         else
1809                 ret = netif_receive_skb(skb);
1810
1811         if (NET_RX_DROP == ret)
1812                 priv->extra_stats.kernel_dropped++;
1813
1814         return 0;
1815 }
1816
1817 /* gfar_clean_rx_ring() -- Processes each frame in the rx ring
1818  *   until the budget/quota has been reached. Returns the number
1819  *   of frames handled
1820  */
1821 int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
1822 {
1823         struct rxbd8 *bdp, *base;
1824         struct sk_buff *skb;
1825         int pkt_len;
1826         int amount_pull;
1827         int howmany = 0;
1828         struct gfar_private *priv = netdev_priv(dev);
1829
1830         /* Get the first full descriptor */
1831         bdp = priv->cur_rx;
1832         base = priv->rx_bd_base;
1833
1834         amount_pull = (gfar_uses_fcb(priv) ? GMAC_FCB_LEN : 0) +
1835                 priv->padding;
1836
1837         while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
1838                 struct sk_buff *newskb;
1839                 rmb();
1840
1841                 /* Add another skb for the future */
1842                 newskb = gfar_new_skb(dev);
1843
1844                 skb = priv->rx_skbuff[priv->skb_currx];
1845
1846                 dma_unmap_single(&priv->ofdev->dev, bdp->bufPtr,
1847                                 priv->rx_buffer_size, DMA_FROM_DEVICE);
1848
1849                 /* We drop the frame if we failed to allocate a new buffer */
1850                 if (unlikely(!newskb || !(bdp->status & RXBD_LAST) ||
1851                                  bdp->status & RXBD_ERR)) {
1852                         count_errors(bdp->status, dev);
1853
1854                         if (unlikely(!newskb))
1855                                 newskb = skb;
1856                         else if (skb) {
1857                                 /*
1858                                  * We need to reset ->data to what it
1859                                  * was before gfar_new_skb() re-aligned
1860                                  * it to an RXBUF_ALIGNMENT boundary
1861                                  * before we put the skb back on the
1862                                  * recycle list.
1863                                  */
1864                                 skb->data = skb->head + NET_SKB_PAD;
1865                                 __skb_queue_head(&priv->rx_recycle, skb);
1866                         }
1867                 } else {
1868                         /* Increment the number of packets */
1869                         dev->stats.rx_packets++;
1870                         howmany++;
1871
1872                         if (likely(skb)) {
1873                                 pkt_len = bdp->length - ETH_FCS_LEN;
1874                                 /* Remove the FCS from the packet length */
1875                                 skb_put(skb, pkt_len);
1876                                 dev->stats.rx_bytes += pkt_len;
1877
1878                                 if (in_irq() || irqs_disabled())
1879                                         printk("Interrupt problem!\n");
1880                                 gfar_process_frame(dev, skb, amount_pull);
1881
1882                         } else {
1883                                 if (netif_msg_rx_err(priv))
1884                                         printk(KERN_WARNING
1885                                                "%s: Missing skb!\n", dev->name);
1886                                 dev->stats.rx_dropped++;
1887                                 priv->extra_stats.rx_skbmissing++;
1888                         }
1889
1890                 }
1891
1892                 priv->rx_skbuff[priv->skb_currx] = newskb;
1893
1894                 /* Setup the new bdp */
1895                 gfar_new_rxbdp(dev, bdp, newskb);
1896
1897                 /* Update to the next pointer */
1898                 bdp = next_bd(bdp, base, priv->rx_ring_size);
1899
1900                 /* update to point at the next skb */
1901                 priv->skb_currx =
1902                     (priv->skb_currx + 1) &
1903                     RX_RING_MOD_MASK(priv->rx_ring_size);
1904         }
1905
1906         /* Update the current rxbd pointer to be the next one */
1907         priv->cur_rx = bdp;
1908
1909         return howmany;
1910 }
1911
1912 static int gfar_poll(struct napi_struct *napi, int budget)
1913 {
1914         struct gfar_private *priv = container_of(napi, struct gfar_private, napi);
1915         struct net_device *dev = priv->ndev;
1916         int tx_cleaned = 0;
1917         int rx_cleaned = 0;
1918         unsigned long flags;
1919
1920         /* Clear IEVENT, so interrupts aren't called again
1921          * because of the packets that have already arrived */
1922         gfar_write(&priv->regs->ievent, IEVENT_RTX_MASK);
1923
1924         /* If we fail to get the lock, don't bother with the TX BDs */
1925         if (spin_trylock_irqsave(&priv->txlock, flags)) {
1926                 tx_cleaned = gfar_clean_tx_ring(dev);
1927                 spin_unlock_irqrestore(&priv->txlock, flags);
1928         }
1929
1930         rx_cleaned = gfar_clean_rx_ring(dev, budget);
1931
1932         if (tx_cleaned)
1933                 return budget;
1934
1935         if (rx_cleaned < budget) {
1936                 napi_complete(napi);
1937
1938                 /* Clear the halt bit in RSTAT */
1939                 gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
1940
1941                 gfar_write(&priv->regs->imask, IMASK_DEFAULT);
1942
1943                 /* If we are coalescing interrupts, update the timer */
1944                 /* Otherwise, clear it */
1945                 if (likely(priv->rxcoalescing)) {
1946                         gfar_write(&priv->regs->rxic, 0);
1947                         gfar_write(&priv->regs->rxic, priv->rxic);
1948                 }
1949                 if (likely(priv->txcoalescing)) {
1950                         gfar_write(&priv->regs->txic, 0);
1951                         gfar_write(&priv->regs->txic, priv->txic);
1952                 }
1953         }
1954
1955         return rx_cleaned;
1956 }
1957
1958 #ifdef CONFIG_NET_POLL_CONTROLLER
1959 /*
1960  * Polling 'interrupt' - used by things like netconsole to send skbs
1961  * without having to re-enable interrupts. It's not called while
1962  * the interrupt routine is executing.
1963  */
1964 static void gfar_netpoll(struct net_device *dev)
1965 {
1966         struct gfar_private *priv = netdev_priv(dev);
1967
1968         /* If the device has multiple interrupts, run tx/rx */
1969         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
1970                 disable_irq(priv->interruptTransmit);
1971                 disable_irq(priv->interruptReceive);
1972                 disable_irq(priv->interruptError);
1973                 gfar_interrupt(priv->interruptTransmit, dev);
1974                 enable_irq(priv->interruptError);
1975                 enable_irq(priv->interruptReceive);
1976                 enable_irq(priv->interruptTransmit);
1977         } else {
1978                 disable_irq(priv->interruptTransmit);
1979                 gfar_interrupt(priv->interruptTransmit, dev);
1980                 enable_irq(priv->interruptTransmit);
1981         }
1982 }
1983 #endif
1984
1985 /* The interrupt handler for devices with one interrupt */
1986 static irqreturn_t gfar_interrupt(int irq, void *dev_id)
1987 {
1988         struct net_device *dev = dev_id;
1989         struct gfar_private *priv = netdev_priv(dev);
1990
1991         /* Save ievent for future reference */
1992         u32 events = gfar_read(&priv->regs->ievent);
1993
1994         /* Check for reception */
1995         if (events & IEVENT_RX_MASK)
1996                 gfar_receive(irq, dev_id);
1997
1998         /* Check for transmit completion */
1999         if (events & IEVENT_TX_MASK)
2000                 gfar_transmit(irq, dev_id);
2001
2002         /* Check for errors */
2003         if (events & IEVENT_ERR_MASK)
2004                 gfar_error(irq, dev_id);
2005
2006         return IRQ_HANDLED;
2007 }
2008
2009 /* Called every time the controller might need to be made
2010  * aware of new link state.  The PHY code conveys this
2011  * information through variables in the phydev structure, and this
2012  * function converts those variables into the appropriate
2013  * register values, and can bring down the device if needed.
2014  */
2015 static void adjust_link(struct net_device *dev)
2016 {
2017         struct gfar_private *priv = netdev_priv(dev);
2018         struct gfar __iomem *regs = priv->regs;
2019         unsigned long flags;
2020         struct phy_device *phydev = priv->phydev;
2021         int new_state = 0;
2022
2023         spin_lock_irqsave(&priv->txlock, flags);
2024         if (phydev->link) {
2025                 u32 tempval = gfar_read(&regs->maccfg2);
2026                 u32 ecntrl = gfar_read(&regs->ecntrl);
2027
2028                 /* Now we make sure that we can be in full duplex mode.
2029                  * If not, we operate in half-duplex mode. */
2030                 if (phydev->duplex != priv->oldduplex) {
2031                         new_state = 1;
2032                         if (!(phydev->duplex))
2033                                 tempval &= ~(MACCFG2_FULL_DUPLEX);
2034                         else
2035                                 tempval |= MACCFG2_FULL_DUPLEX;
2036
2037                         priv->oldduplex = phydev->duplex;
2038                 }
2039
2040                 if (phydev->speed != priv->oldspeed) {
2041                         new_state = 1;
2042                         switch (phydev->speed) {
2043                         case 1000:
2044                                 tempval =
2045                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_GMII);
2046
2047                                 ecntrl &= ~(ECNTRL_R100);
2048                                 break;
2049                         case 100:
2050                         case 10:
2051                                 tempval =
2052                                     ((tempval & ~(MACCFG2_IF)) | MACCFG2_MII);
2053
2054                                 /* Reduced mode distinguishes
2055                                  * between 10 and 100 */
2056                                 if (phydev->speed == SPEED_100)
2057                                         ecntrl |= ECNTRL_R100;
2058                                 else
2059                                         ecntrl &= ~(ECNTRL_R100);
2060                                 break;
2061                         default:
2062                                 if (netif_msg_link(priv))
2063                                         printk(KERN_WARNING
2064                                                 "%s: Ack!  Speed (%d) is not 10/100/1000!\n",
2065                                                 dev->name, phydev->speed);
2066                                 break;
2067                         }
2068
2069                         priv->oldspeed = phydev->speed;
2070                 }
2071
2072                 gfar_write(&regs->maccfg2, tempval);
2073                 gfar_write(&regs->ecntrl, ecntrl);
2074
2075                 if (!priv->oldlink) {
2076                         new_state = 1;
2077                         priv->oldlink = 1;
2078                 }
2079         } else if (priv->oldlink) {
2080                 new_state = 1;
2081                 priv->oldlink = 0;
2082                 priv->oldspeed = 0;
2083                 priv->oldduplex = -1;
2084         }
2085
2086         if (new_state && netif_msg_link(priv))
2087                 phy_print_status(phydev);
2088
2089         spin_unlock_irqrestore(&priv->txlock, flags);
2090 }
2091
2092 /* Update the hash table based on the current list of multicast
2093  * addresses we subscribe to.  Also, change the promiscuity of
2094  * the device based on the flags (this function is called
2095  * whenever dev->flags is changed */
2096 static void gfar_set_multi(struct net_device *dev)
2097 {
2098         struct dev_mc_list *mc_ptr;
2099         struct gfar_private *priv = netdev_priv(dev);
2100         struct gfar __iomem *regs = priv->regs;
2101         u32 tempval;
2102
2103         if(dev->flags & IFF_PROMISC) {
2104                 /* Set RCTRL to PROM */
2105                 tempval = gfar_read(&regs->rctrl);
2106                 tempval |= RCTRL_PROM;
2107                 gfar_write(&regs->rctrl, tempval);
2108         } else {
2109                 /* Set RCTRL to not PROM */
2110                 tempval = gfar_read(&regs->rctrl);
2111                 tempval &= ~(RCTRL_PROM);
2112                 gfar_write(&regs->rctrl, tempval);
2113         }
2114
2115         if(dev->flags & IFF_ALLMULTI) {
2116                 /* Set the hash to rx all multicast frames */
2117                 gfar_write(&regs->igaddr0, 0xffffffff);
2118                 gfar_write(&regs->igaddr1, 0xffffffff);
2119                 gfar_write(&regs->igaddr2, 0xffffffff);
2120                 gfar_write(&regs->igaddr3, 0xffffffff);
2121                 gfar_write(&regs->igaddr4, 0xffffffff);
2122                 gfar_write(&regs->igaddr5, 0xffffffff);
2123                 gfar_write(&regs->igaddr6, 0xffffffff);
2124                 gfar_write(&regs->igaddr7, 0xffffffff);
2125                 gfar_write(&regs->gaddr0, 0xffffffff);
2126                 gfar_write(&regs->gaddr1, 0xffffffff);
2127                 gfar_write(&regs->gaddr2, 0xffffffff);
2128                 gfar_write(&regs->gaddr3, 0xffffffff);
2129                 gfar_write(&regs->gaddr4, 0xffffffff);
2130                 gfar_write(&regs->gaddr5, 0xffffffff);
2131                 gfar_write(&regs->gaddr6, 0xffffffff);
2132                 gfar_write(&regs->gaddr7, 0xffffffff);
2133         } else {
2134                 int em_num;
2135                 int idx;
2136
2137                 /* zero out the hash */
2138                 gfar_write(&regs->igaddr0, 0x0);
2139                 gfar_write(&regs->igaddr1, 0x0);
2140                 gfar_write(&regs->igaddr2, 0x0);
2141                 gfar_write(&regs->igaddr3, 0x0);
2142                 gfar_write(&regs->igaddr4, 0x0);
2143                 gfar_write(&regs->igaddr5, 0x0);
2144                 gfar_write(&regs->igaddr6, 0x0);
2145                 gfar_write(&regs->igaddr7, 0x0);
2146                 gfar_write(&regs->gaddr0, 0x0);
2147                 gfar_write(&regs->gaddr1, 0x0);
2148                 gfar_write(&regs->gaddr2, 0x0);
2149                 gfar_write(&regs->gaddr3, 0x0);
2150                 gfar_write(&regs->gaddr4, 0x0);
2151                 gfar_write(&regs->gaddr5, 0x0);
2152                 gfar_write(&regs->gaddr6, 0x0);
2153                 gfar_write(&regs->gaddr7, 0x0);
2154
2155                 /* If we have extended hash tables, we need to
2156                  * clear the exact match registers to prepare for
2157                  * setting them */
2158                 if (priv->extended_hash) {
2159                         em_num = GFAR_EM_NUM + 1;
2160                         gfar_clear_exact_match(dev);
2161                         idx = 1;
2162                 } else {
2163                         idx = 0;
2164                         em_num = 0;
2165                 }
2166
2167                 if(dev->mc_count == 0)
2168                         return;
2169
2170                 /* Parse the list, and set the appropriate bits */
2171                 for(mc_ptr = dev->mc_list; mc_ptr; mc_ptr = mc_ptr->next) {
2172                         if (idx < em_num) {
2173                                 gfar_set_mac_for_addr(dev, idx,
2174                                                 mc_ptr->dmi_addr);
2175                                 idx++;
2176                         } else
2177                                 gfar_set_hash_for_addr(dev, mc_ptr->dmi_addr);
2178                 }
2179         }
2180
2181         return;
2182 }
2183
2184
2185 /* Clears each of the exact match registers to zero, so they
2186  * don't interfere with normal reception */
2187 static void gfar_clear_exact_match(struct net_device *dev)
2188 {
2189         int idx;
2190         u8 zero_arr[MAC_ADDR_LEN] = {0,0,0,0,0,0};
2191
2192         for(idx = 1;idx < GFAR_EM_NUM + 1;idx++)
2193                 gfar_set_mac_for_addr(dev, idx, (u8 *)zero_arr);
2194 }
2195
2196 /* Set the appropriate hash bit for the given addr */
2197 /* The algorithm works like so:
2198  * 1) Take the Destination Address (ie the multicast address), and
2199  * do a CRC on it (little endian), and reverse the bits of the
2200  * result.
2201  * 2) Use the 8 most significant bits as a hash into a 256-entry
2202  * table.  The table is controlled through 8 32-bit registers:
2203  * gaddr0-7.  gaddr0's MSB is entry 0, and gaddr7's LSB is
2204  * gaddr7.  This means that the 3 most significant bits in the
2205  * hash index which gaddr register to use, and the 5 other bits
2206  * indicate which bit (assuming an IBM numbering scheme, which
2207  * for PowerPC (tm) is usually the case) in the register holds
2208  * the entry. */
2209 static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr)
2210 {
2211         u32 tempval;
2212         struct gfar_private *priv = netdev_priv(dev);
2213         u32 result = ether_crc(MAC_ADDR_LEN, addr);
2214         int width = priv->hash_width;
2215         u8 whichbit = (result >> (32 - width)) & 0x1f;
2216         u8 whichreg = result >> (32 - width + 5);
2217         u32 value = (1 << (31-whichbit));
2218
2219         tempval = gfar_read(priv->hash_regs[whichreg]);
2220         tempval |= value;
2221         gfar_write(priv->hash_regs[whichreg], tempval);
2222
2223         return;
2224 }
2225
2226
2227 /* There are multiple MAC Address register pairs on some controllers
2228  * This function sets the numth pair to a given address
2229  */
2230 static void gfar_set_mac_for_addr(struct net_device *dev, int num, u8 *addr)
2231 {
2232         struct gfar_private *priv = netdev_priv(dev);
2233         int idx;
2234         char tmpbuf[MAC_ADDR_LEN];
2235         u32 tempval;
2236         u32 __iomem *macptr = &priv->regs->macstnaddr1;
2237
2238         macptr += num*2;
2239
2240         /* Now copy it into the mac registers backwards, cuz */
2241         /* little endian is silly */
2242         for (idx = 0; idx < MAC_ADDR_LEN; idx++)
2243                 tmpbuf[MAC_ADDR_LEN - 1 - idx] = addr[idx];
2244
2245         gfar_write(macptr, *((u32 *) (tmpbuf)));
2246
2247         tempval = *((u32 *) (tmpbuf + 4));
2248
2249         gfar_write(macptr+1, tempval);
2250 }
2251
2252 /* GFAR error interrupt handler */
2253 static irqreturn_t gfar_error(int irq, void *dev_id)
2254 {
2255         struct net_device *dev = dev_id;
2256         struct gfar_private *priv = netdev_priv(dev);
2257
2258         /* Save ievent for future reference */
2259         u32 events = gfar_read(&priv->regs->ievent);
2260
2261         /* Clear IEVENT */
2262         gfar_write(&priv->regs->ievent, events & IEVENT_ERR_MASK);
2263
2264         /* Magic Packet is not an error. */
2265         if ((priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET) &&
2266             (events & IEVENT_MAG))
2267                 events &= ~IEVENT_MAG;
2268
2269         /* Hmm... */
2270         if (netif_msg_rx_err(priv) || netif_msg_tx_err(priv))
2271                 printk(KERN_DEBUG "%s: error interrupt (ievent=0x%08x imask=0x%08x)\n",
2272                        dev->name, events, gfar_read(&priv->regs->imask));
2273
2274         /* Update the error counters */
2275         if (events & IEVENT_TXE) {
2276                 dev->stats.tx_errors++;
2277
2278                 if (events & IEVENT_LC)
2279                         dev->stats.tx_window_errors++;
2280                 if (events & IEVENT_CRL)
2281                         dev->stats.tx_aborted_errors++;
2282                 if (events & IEVENT_XFUN) {
2283                         if (netif_msg_tx_err(priv))
2284                                 printk(KERN_DEBUG "%s: TX FIFO underrun, "
2285                                        "packet dropped.\n", dev->name);
2286                         dev->stats.tx_dropped++;
2287                         priv->extra_stats.tx_underrun++;
2288
2289                         /* Reactivate the Tx Queues */
2290                         gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
2291                 }
2292                 if (netif_msg_tx_err(priv))
2293                         printk(KERN_DEBUG "%s: Transmit Error\n", dev->name);
2294         }
2295         if (events & IEVENT_BSY) {
2296                 dev->stats.rx_errors++;
2297                 priv->extra_stats.rx_bsy++;
2298
2299                 gfar_receive(irq, dev_id);
2300
2301                 if (netif_msg_rx_err(priv))
2302                         printk(KERN_DEBUG "%s: busy error (rstat: %x)\n",
2303                                dev->name, gfar_read(&priv->regs->rstat));
2304         }
2305         if (events & IEVENT_BABR) {
2306                 dev->stats.rx_errors++;
2307                 priv->extra_stats.rx_babr++;
2308
2309                 if (netif_msg_rx_err(priv))
2310                         printk(KERN_DEBUG "%s: babbling RX error\n", dev->name);
2311         }
2312         if (events & IEVENT_EBERR) {
2313                 priv->extra_stats.eberr++;
2314                 if (netif_msg_rx_err(priv))
2315                         printk(KERN_DEBUG "%s: bus error\n", dev->name);
2316         }
2317         if ((events & IEVENT_RXC) && netif_msg_rx_status(priv))
2318                 printk(KERN_DEBUG "%s: control frame\n", dev->name);
2319
2320         if (events & IEVENT_BABT) {
2321                 priv->extra_stats.tx_babt++;
2322                 if (netif_msg_tx_err(priv))
2323                         printk(KERN_DEBUG "%s: babbling TX error\n", dev->name);
2324         }
2325         return IRQ_HANDLED;
2326 }
2327
2328 /* work with hotplug and coldplug */
2329 MODULE_ALIAS("platform:fsl-gianfar");
2330
2331 static struct of_device_id gfar_match[] =
2332 {
2333         {
2334                 .type = "network",
2335                 .compatible = "gianfar",
2336         },
2337         {},
2338 };
2339
2340 /* Structure for a device driver */
2341 static struct of_platform_driver gfar_driver = {
2342         .name = "fsl-gianfar",
2343         .match_table = gfar_match,
2344
2345         .probe = gfar_probe,
2346         .remove = gfar_remove,
2347         .suspend = gfar_suspend,
2348         .resume = gfar_resume,
2349 };
2350
2351 static int __init gfar_init(void)
2352 {
2353         return of_register_platform_driver(&gfar_driver);
2354 }
2355
2356 static void __exit gfar_exit(void)
2357 {
2358         of_unregister_platform_driver(&gfar_driver);
2359 }
2360
2361 module_init(gfar_init);
2362 module_exit(gfar_exit);
2363