drivers/net/fs_enet/fs_enet-main.c

   1 /*
   2  * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
   3  *
   4  * Copyright (c) 2003 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * 2005 (c) MontaVista Software, Inc.
   8  * Vitaly Bordug <vbordug@ru.mvista.com>
   9  *
  10  * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
  11  * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
  12  *
  13  * This file is licensed under the terms of the GNU General Public License
  14  * version 2. This program is licensed "as is" without any warranty of any
  15  * kind, whether express or implied.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/errno.h>
  24 #include <linux/ioport.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/init.h>
  28 #include <linux/delay.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/mii.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/bitops.h>
  36 #include <linux/fs.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/phy.h>
  39 #include <linux/of.h>
  40 #include <linux/of_mdio.h>
  41 #include <linux/of_platform.h>
  42 #include <linux/of_gpio.h>
  43
  44 #include <linux/vmalloc.h>
  45 #include <asm/pgtable.h>
  46 #include <asm/irq.h>
  47 #include <asm/uaccess.h>
  48
  49 #include "fs_enet.h"
  50
  51 /*************************************************/
  52
  53 MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  54 MODULE_DESCRIPTION("Freescale Ethernet Driver");
  55 MODULE_LICENSE("GPL");
  56 MODULE_VERSION(DRV_MODULE_VERSION);
  57
  58 static int fs_enet_debug = -1; /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
  59 module_param(fs_enet_debug, int, 0);
  60 MODULE_PARM_DESC(fs_enet_debug,
  61                  "Freescale bitmapped debugging message enable value");
  62
  63 #ifdef CONFIG_NET_POLL_CONTROLLER
  64 static void fs_enet_netpoll(struct net_device *dev);
  65 #endif
  66
  67 static void fs_set_multicast_list(struct net_device *dev)
  68 {
  69         struct fs_enet_private *fep = netdev_priv(dev);
  70
  71         (*fep->ops->set_multicast_list)(dev);
  72 }
  73
  74 static void skb_align(struct sk_buff *skb, int align)
  75 {
  76         int off = ((unsigned long)skb->data) & (align - 1);
  77
  78         if (off)
  79                 skb_reserve(skb, align - off);
  80 }
  81
  82 /* NAPI receive function */
  83 static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
  84 {
  85         struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
  86         struct net_device *dev = fep->ndev;
  87         const struct fs_platform_info *fpi = fep->fpi;
  88         cbd_t __iomem *bdp;
  89         struct sk_buff *skb, *skbn, *skbt;
  90         int received = 0;
  91         u16 pkt_len, sc;
  92         int curidx;
  93
  94         /*
  95          * First, grab all of the stats for the incoming packet.
  96          * These get messed up if we get called due to a busy condition.
  97          */
  98         bdp = fep->cur_rx;
  99
 100         /* clear RX status bits for napi*/
 101         (*fep->ops->napi_clear_rx_event)(dev);
 102
 103         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 104                 curidx = bdp - fep->rx_bd_base;
 105
 106                 /*
 107                  * Since we have allocated space to hold a complete frame,
 108                  * the last indicator should be set.
 109                  */
 110                 if ((sc & BD_ENET_RX_LAST) == 0)
 111                         printk(KERN_WARNING DRV_MODULE_NAME
 112                                ": %s rcv is not +last\n",
 113                                dev->name);
 114
 115                 /*
 116                  * Check for errors.
 117                  */
 118                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 119                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 120                         fep->stats.rx_errors++;
 121                         /* Frame too long or too short. */
 122                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 123                                 fep->stats.rx_length_errors++;
 124                         /* Frame alignment */
 125                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 126                                 fep->stats.rx_frame_errors++;
 127                         /* CRC Error */
 128                         if (sc & BD_ENET_RX_CR)
 129                                 fep->stats.rx_crc_errors++;
 130                         /* FIFO overrun */
 131                         if (sc & BD_ENET_RX_OV)
 132                                 fep->stats.rx_crc_errors++;
 133
 134                         skb = fep->rx_skbuff[curidx];
 135
 136                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 137                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 138                                 DMA_FROM_DEVICE);
 139
 140                         skbn = skb;
 141
 142                 } else {
 143                         skb = fep->rx_skbuff[curidx];
 144
 145                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 146                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 147                                 DMA_FROM_DEVICE);
 148
 149                         /*
 150                          * Process the incoming frame.
 151                          */
 152                         fep->stats.rx_packets++;
 153                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 154                         fep->stats.rx_bytes += pkt_len + 4;
 155
 156                         if (pkt_len <= fpi->rx_copybreak) {
 157                                 /* +2 to make IP header L1 cache aligned */
 158                                 skbn = dev_alloc_skb(pkt_len + 2);
 159                                 if (skbn != NULL) {
 160                                         skb_reserve(skbn, 2);   /* align IP header */
 161                                         skb_copy_from_linear_data(skb,
 162                                                       skbn->data, pkt_len);
 163                                         /* swap */
 164                                         skbt = skb;
 165                                         skb = skbn;
 166                                         skbn = skbt;
 167                                 }
 168                         } else {
 169                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 170
 171                                 if (skbn)
 172                                         skb_align(skbn, ENET_RX_ALIGN);
 173                         }
 174
 175                         if (skbn != NULL) {
 176                                 skb_put(skb, pkt_len);  /* Make room */
 177                                 skb->protocol = eth_type_trans(skb, dev);
 178                                 received++;
 179                                 netif_receive_skb(skb);
 180                         } else {
 181                                 printk(KERN_WARNING DRV_MODULE_NAME
 182                                        ": %s Memory squeeze, dropping packet.\n",
 183                                        dev->name);
 184                                 fep->stats.rx_dropped++;
 185                                 skbn = skb;
 186                         }
 187                 }
 188
 189                 fep->rx_skbuff[curidx] = skbn;
 190                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 191                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 192                              DMA_FROM_DEVICE));
 193                 CBDW_DATLEN(bdp, 0);
 194                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 195
 196                 /*
 197                  * Update BD pointer to next entry.
 198                  */
 199                 if ((sc & BD_ENET_RX_WRAP) == 0)
 200                         bdp++;
 201                 else
 202                         bdp = fep->rx_bd_base;
 203
 204                 (*fep->ops->rx_bd_done)(dev);
 205
 206                 if (received >= budget)
 207                         break;
 208         }
 209
 210         fep->cur_rx = bdp;
 211
 212         if (received < budget) {
 213                 /* done */
 214                 napi_complete(napi);
 215                 (*fep->ops->napi_enable_rx)(dev);
 216         }
 217         return received;
 218 }
 219
 220 /* non NAPI receive function */
 221 static int fs_enet_rx_non_napi(struct net_device *dev)
 222 {
 223         struct fs_enet_private *fep = netdev_priv(dev);
 224         const struct fs_platform_info *fpi = fep->fpi;
 225         cbd_t __iomem *bdp;
 226         struct sk_buff *skb, *skbn, *skbt;
 227         int received = 0;
 228         u16 pkt_len, sc;
 229         int curidx;
 230         /*
 231          * First, grab all of the stats for the incoming packet.
 232          * These get messed up if we get called due to a busy condition.
 233          */
 234         bdp = fep->cur_rx;
 235
 236         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 237
 238                 curidx = bdp - fep->rx_bd_base;
 239
 240                 /*
 241                  * Since we have allocated space to hold a complete frame,
 242                  * the last indicator should be set.
 243                  */
 244                 if ((sc & BD_ENET_RX_LAST) == 0)
 245                         printk(KERN_WARNING DRV_MODULE_NAME
 246                                ": %s rcv is not +last\n",
 247                                dev->name);
 248
 249                 /*
 250                  * Check for errors.
 251                  */
 252                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 253                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 254                         fep->stats.rx_errors++;
 255                         /* Frame too long or too short. */
 256                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 257                                 fep->stats.rx_length_errors++;
 258                         /* Frame alignment */
 259                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 260                                 fep->stats.rx_frame_errors++;
 261                         /* CRC Error */
 262                         if (sc & BD_ENET_RX_CR)
 263                                 fep->stats.rx_crc_errors++;
 264                         /* FIFO overrun */
 265                         if (sc & BD_ENET_RX_OV)
 266                                 fep->stats.rx_crc_errors++;
 267
 268                         skb = fep->rx_skbuff[curidx];
 269
 270                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 271                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 272                                 DMA_FROM_DEVICE);
 273
 274                         skbn = skb;
 275
 276                 } else {
 277
 278                         skb = fep->rx_skbuff[curidx];
 279
 280                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 281                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 282                                 DMA_FROM_DEVICE);
 283
 284                         /*
 285                          * Process the incoming frame.
 286                          */
 287                         fep->stats.rx_packets++;
 288                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 289                         fep->stats.rx_bytes += pkt_len + 4;
 290
 291                         if (pkt_len <= fpi->rx_copybreak) {
 292                                 /* +2 to make IP header L1 cache aligned */
 293                                 skbn = dev_alloc_skb(pkt_len + 2);
 294                                 if (skbn != NULL) {
 295                                         skb_reserve(skbn, 2);   /* align IP header */
 296                                         skb_copy_from_linear_data(skb,
 297                                                       skbn->data, pkt_len);
 298                                         /* swap */
 299                                         skbt = skb;
 300                                         skb = skbn;
 301                                         skbn = skbt;
 302                                 }
 303                         } else {
 304                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 305
 306                                 if (skbn)
 307                                         skb_align(skbn, ENET_RX_ALIGN);
 308                         }
 309
 310                         if (skbn != NULL) {
 311                                 skb_put(skb, pkt_len);  /* Make room */
 312                                 skb->protocol = eth_type_trans(skb, dev);
 313                                 received++;
 314                                 netif_rx(skb);
 315                         } else {
 316                                 printk(KERN_WARNING DRV_MODULE_NAME
 317                                        ": %s Memory squeeze, dropping packet.\n",
 318                                        dev->name);
 319                                 fep->stats.rx_dropped++;
 320                                 skbn = skb;
 321                         }
 322                 }
 323
 324                 fep->rx_skbuff[curidx] = skbn;
 325                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 326                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 327                              DMA_FROM_DEVICE));
 328                 CBDW_DATLEN(bdp, 0);
 329                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 330
 331                 /*
 332                  * Update BD pointer to next entry.
 333                  */
 334                 if ((sc & BD_ENET_RX_WRAP) == 0)
 335                         bdp++;
 336                 else
 337                         bdp = fep->rx_bd_base;
 338
 339                 (*fep->ops->rx_bd_done)(dev);
 340         }
 341
 342         fep->cur_rx = bdp;
 343
 344         return 0;
 345 }
 346
 347 static void fs_enet_tx(struct net_device *dev)
 348 {
 349         struct fs_enet_private *fep = netdev_priv(dev);
 350         cbd_t __iomem *bdp;
 351         struct sk_buff *skb;
 352         int dirtyidx, do_wake, do_restart;
 353         u16 sc;
 354
 355         spin_lock(&fep->tx_lock);
 356         bdp = fep->dirty_tx;
 357
 358         do_wake = do_restart = 0;
 359         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
 360                 dirtyidx = bdp - fep->tx_bd_base;
 361
 362                 if (fep->tx_free == fep->tx_ring)
 363                         break;
 364
 365                 skb = fep->tx_skbuff[dirtyidx];
 366
 367                 /*
 368                  * Check for errors.
 369                  */
 370                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 371                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 372
 373                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 374                                 fep->stats.tx_heartbeat_errors++;
 375                         if (sc & BD_ENET_TX_LC) /* Late collision */
 376                                 fep->stats.tx_window_errors++;
 377                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 378                                 fep->stats.tx_aborted_errors++;
 379                         if (sc & BD_ENET_TX_UN) /* Underrun */
 380                                 fep->stats.tx_fifo_errors++;
 381                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 382                                 fep->stats.tx_carrier_errors++;
 383
 384                         if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
 385                                 fep->stats.tx_errors++;
 386                                 do_restart = 1;
 387                         }
 388                 } else
 389                         fep->stats.tx_packets++;
 390
 391                 if (sc & BD_ENET_TX_READY)
 392                         printk(KERN_WARNING DRV_MODULE_NAME
 393                                ": %s HEY! Enet xmit interrupt and TX_READY.\n",
 394                                dev->name);
 395
 396                 /*
 397                  * Deferred means some collisions occurred during transmit,
 398                  * but we eventually sent the packet OK.
 399                  */
 400                 if (sc & BD_ENET_TX_DEF)
 401                         fep->stats.collisions++;
 402
 403                 /* unmap */
 404                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 405                                 skb->len, DMA_TO_DEVICE);
 406
 407                 /*
 408                  * Free the sk buffer associated with this last transmit.
 409                  */
 410                 dev_kfree_skb_irq(skb);
 411                 fep->tx_skbuff[dirtyidx] = NULL;
 412
 413                 /*
 414                  * Update pointer to next buffer descriptor to be transmitted.
 415                  */
 416                 if ((sc & BD_ENET_TX_WRAP) == 0)
 417                         bdp++;
 418                 else
 419                         bdp = fep->tx_bd_base;
 420
 421                 /*
 422                  * Since we have freed up a buffer, the ring is no longer
 423                  * full.
 424                  */
 425                 if (!fep->tx_free++)
 426                         do_wake = 1;
 427         }
 428
 429         fep->dirty_tx = bdp;
 430
 431         if (do_restart)
 432                 (*fep->ops->tx_restart)(dev);
 433
 434         spin_unlock(&fep->tx_lock);
 435
 436         if (do_wake)
 437                 netif_wake_queue(dev);
 438 }
 439
 440 /*
 441  * The interrupt handler.
 442  * This is called from the MPC core interrupt.
 443  */
 444 static irqreturn_t
 445 fs_enet_interrupt(int irq, void *dev_id)
 446 {
 447         struct net_device *dev = dev_id;
 448         struct fs_enet_private *fep;
 449         const struct fs_platform_info *fpi;
 450         u32 int_events;
 451         u32 int_clr_events;
 452         int nr, napi_ok;
 453         int handled;
 454
 455         fep = netdev_priv(dev);
 456         fpi = fep->fpi;
 457
 458         nr = 0;
 459         while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
 460                 nr++;
 461
 462                 int_clr_events = int_events;
 463                 if (fpi->use_napi)
 464                         int_clr_events &= ~fep->ev_napi_rx;
 465
 466                 (*fep->ops->clear_int_events)(dev, int_clr_events);
 467
 468                 if (int_events & fep->ev_err)
 469                         (*fep->ops->ev_error)(dev, int_events);
 470
 471                 if (int_events & fep->ev_rx) {
 472                         if (!fpi->use_napi)
 473                                 fs_enet_rx_non_napi(dev);
 474                         else {
 475                                 napi_ok = napi_schedule_prep(&fep->napi);
 476
 477                                 (*fep->ops->napi_disable_rx)(dev);
 478                                 (*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
 479
 480                                 /* NOTE: it is possible for FCCs in NAPI mode    */
 481                                 /* to submit a spurious interrupt while in poll  */
 482                                 if (napi_ok)
 483                                         __napi_schedule(&fep->napi);
 484                         }
 485                 }
 486
 487                 if (int_events & fep->ev_tx)
 488                         fs_enet_tx(dev);
 489         }
 490
 491         handled = nr > 0;
 492         return IRQ_RETVAL(handled);
 493 }
 494
 495 void fs_init_bds(struct net_device *dev)
 496 {
 497         struct fs_enet_private *fep = netdev_priv(dev);
 498         cbd_t __iomem *bdp;
 499         struct sk_buff *skb;
 500         int i;
 501
 502         fs_cleanup_bds(dev);
 503
 504         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 505         fep->tx_free = fep->tx_ring;
 506         fep->cur_rx = fep->rx_bd_base;
 507
 508         /*
 509          * Initialize the receive buffer descriptors.
 510          */
 511         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 512                 skb = dev_alloc_skb(ENET_RX_FRSIZE);
 513                 if (skb == NULL) {
 514                         printk(KERN_WARNING DRV_MODULE_NAME
 515                                ": %s Memory squeeze, unable to allocate skb\n",
 516                                dev->name);
 517                         break;
 518                 }
 519                 skb_align(skb, ENET_RX_ALIGN);
 520                 fep->rx_skbuff[i] = skb;
 521                 CBDW_BUFADDR(bdp,
 522                         dma_map_single(fep->dev, skb->data,
 523                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 524                                 DMA_FROM_DEVICE));
 525                 CBDW_DATLEN(bdp, 0);    /* zero */
 526                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 527                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 528         }
 529         /*
 530          * if we failed, fillup remainder
 531          */
 532         for (; i < fep->rx_ring; i++, bdp++) {
 533                 fep->rx_skbuff[i] = NULL;
 534                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 535         }
 536
 537         /*
 538          * ...and the same for transmit.
 539          */
 540         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 541                 fep->tx_skbuff[i] = NULL;
 542                 CBDW_BUFADDR(bdp, 0);
 543                 CBDW_DATLEN(bdp, 0);
 544                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 545         }
 546 }
 547
 548 void fs_cleanup_bds(struct net_device *dev)
 549 {
 550         struct fs_enet_private *fep = netdev_priv(dev);
 551         struct sk_buff *skb;
 552         cbd_t __iomem *bdp;
 553         int i;
 554
 555         /*
 556          * Reset SKB transmit buffers.
 557          */
 558         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 559                 if ((skb = fep->tx_skbuff[i]) == NULL)
 560                         continue;
 561
 562                 /* unmap */
 563                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 564                                 skb->len, DMA_TO_DEVICE);
 565
 566                 fep->tx_skbuff[i] = NULL;
 567                 dev_kfree_skb(skb);
 568         }
 569
 570         /*
 571          * Reset SKB receive buffers
 572          */
 573         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 574                 if ((skb = fep->rx_skbuff[i]) == NULL)
 575                         continue;
 576
 577                 /* unmap */
 578                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 579                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 580                         DMA_FROM_DEVICE);
 581
 582                 fep->rx_skbuff[i] = NULL;
 583
 584                 dev_kfree_skb(skb);
 585         }
 586 }
 587
 588 /**********************************************************************************/
 589
 590 static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 591 {
 592         struct fs_enet_private *fep = netdev_priv(dev);
 593         cbd_t __iomem *bdp;
 594         int curidx;
 595         u16 sc;
 596         unsigned long flags;
 597
 598         spin_lock_irqsave(&fep->tx_lock, flags);
 599
 600         /*
 601          * Fill in a Tx ring entry
 602          */
 603         bdp = fep->cur_tx;
 604
 605         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 606                 netif_stop_queue(dev);
 607                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 608
 609                 /*
 610                  * Ooops.  All transmit buffers are full.  Bail out.
 611                  * This should not happen, since the tx queue should be stopped.
 612                  */
 613                 printk(KERN_WARNING DRV_MODULE_NAME
 614                        ": %s tx queue full!.\n", dev->name);
 615                 return NETDEV_TX_BUSY;
 616         }
 617
 618         curidx = bdp - fep->tx_bd_base;
 619         /*
 620          * Clear all of the status flags.
 621          */
 622         CBDC_SC(bdp, BD_ENET_TX_STATS);
 623
 624         /*
 625          * Save skb pointer.
 626          */
 627         fep->tx_skbuff[curidx] = skb;
 628
 629         fep->stats.tx_bytes += skb->len;
 630
 631         /*
 632          * Push the data cache so the CPM does not get stale memory data.
 633          */
 634         CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
 635                                 skb->data, skb->len, DMA_TO_DEVICE));
 636         CBDW_DATLEN(bdp, skb->len);
 637
 638         dev->trans_start = jiffies;
 639
 640         /*
 641          * If this was the last BD in the ring, start at the beginning again.
 642          */
 643         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 644                 fep->cur_tx++;
 645         else
 646                 fep->cur_tx = fep->tx_bd_base;
 647
 648         if (!--fep->tx_free)
 649                 netif_stop_queue(dev);
 650
 651         /* Trigger transmission start */
 652         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 653              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 654
 655         /* note that while FEC does not have this bit
 656          * it marks it as available for software use
 657          * yay for hw reuse :) */
 658         if (skb->len <= 60)
 659                 sc |= BD_ENET_TX_PAD;
 660         CBDS_SC(bdp, sc);
 661
 662         (*fep->ops->tx_kickstart)(dev);
 663
 664         spin_unlock_irqrestore(&fep->tx_lock, flags);
 665
 666         return NETDEV_TX_OK;
 667 }
 668
 669 static void fs_timeout(struct net_device *dev)
 670 {
 671         struct fs_enet_private *fep = netdev_priv(dev);
 672         unsigned long flags;
 673         int wake = 0;
 674
 675         fep->stats.tx_errors++;
 676
 677         spin_lock_irqsave(&fep->lock, flags);
 678
 679         if (dev->flags & IFF_UP) {
 680                 phy_stop(fep->phydev);
 681                 (*fep->ops->stop)(dev);
 682                 (*fep->ops->restart)(dev);
 683                 phy_start(fep->phydev);
 684         }
 685
 686         phy_start(fep->phydev);
 687         wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 688         spin_unlock_irqrestore(&fep->lock, flags);
 689
 690         if (wake)
 691                 netif_wake_queue(dev);
 692 }
 693
 694 /*-----------------------------------------------------------------------------
 695  *  generic link-change handler - should be sufficient for most cases
 696  *-----------------------------------------------------------------------------*/
 697 static void generic_adjust_link(struct  net_device *dev)
 698 {
 699         struct fs_enet_private *fep = netdev_priv(dev);
 700         struct phy_device *phydev = fep->phydev;
 701         int new_state = 0;
 702
 703         if (phydev->link) {
 704                 /* adjust to duplex mode */
 705                 if (phydev->duplex != fep->oldduplex) {
 706                         new_state = 1;
 707                         fep->oldduplex = phydev->duplex;
 708                 }
 709
 710                 if (phydev->speed != fep->oldspeed) {
 711                         new_state = 1;
 712                         fep->oldspeed = phydev->speed;
 713                 }
 714
 715                 if (!fep->oldlink) {
 716                         new_state = 1;
 717                         fep->oldlink = 1;
 718                 }
 719
 720                 if (new_state)
 721                         fep->ops->restart(dev);
 722         } else if (fep->oldlink) {
 723                 new_state = 1;
 724                 fep->oldlink = 0;
 725                 fep->oldspeed = 0;
 726                 fep->oldduplex = -1;
 727         }
 728
 729         if (new_state && netif_msg_link(fep))
 730                 phy_print_status(phydev);
 731 }
 732
 733
 734 static void fs_adjust_link(struct net_device *dev)
 735 {
 736         struct fs_enet_private *fep = netdev_priv(dev);
 737         unsigned long flags;
 738
 739         spin_lock_irqsave(&fep->lock, flags);
 740
 741         if(fep->ops->adjust_link)
 742                 fep->ops->adjust_link(dev);
 743         else
 744                 generic_adjust_link(dev);
 745
 746         spin_unlock_irqrestore(&fep->lock, flags);
 747 }
 748
 749 static int fs_init_phy(struct net_device *dev)
 750 {
 751         struct fs_enet_private *fep = netdev_priv(dev);
 752         struct phy_device *phydev;
 753
 754         fep->oldlink = 0;
 755         fep->oldspeed = 0;
 756         fep->oldduplex = -1;
 757         if(fep->fpi->phy_node)
 758                 phydev = of_phy_connect(dev, fep->fpi->phy_node,
 759                                         &fs_adjust_link, 0,
 760                                         PHY_INTERFACE_MODE_MII);
 761         else {
 762                 printk("No phy bus ID specified in BSP code\n");
 763                 return -EINVAL;
 764         }
 765         if (IS_ERR(phydev)) {
 766                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 767                 return PTR_ERR(phydev);
 768         }
 769
 770         fep->phydev = phydev;
 771
 772         return 0;
 773 }
 774
 775 static int fs_enet_open(struct net_device *dev)
 776 {
 777         struct fs_enet_private *fep = netdev_priv(dev);
 778         int r;
 779         int err;
 780
 781         /* to initialize the fep->cur_rx,... */
 782         /* not doing this, will cause a crash in fs_enet_rx_napi */
 783         fs_init_bds(fep->ndev);
 784
 785         if (fep->fpi->use_napi)
 786                 napi_enable(&fep->napi);
 787
 788         /* Install our interrupt handler. */
 789         r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
 790                         "fs_enet-mac", dev);
 791         if (r != 0) {
 792                 printk(KERN_ERR DRV_MODULE_NAME
 793                        ": %s Could not allocate FS_ENET IRQ!", dev->name);
 794                 if (fep->fpi->use_napi)
 795                         napi_disable(&fep->napi);
 796                 return -EINVAL;
 797         }
 798
 799         err = fs_init_phy(dev);
 800         if (err) {
 801                 free_irq(fep->interrupt, dev);
 802                 if (fep->fpi->use_napi)
 803                         napi_disable(&fep->napi);
 804                 return err;
 805         }
 806         phy_start(fep->phydev);
 807
 808         netif_start_queue(dev);
 809
 810         return 0;
 811 }
 812
 813 static int fs_enet_close(struct net_device *dev)
 814 {
 815         struct fs_enet_private *fep = netdev_priv(dev);
 816         unsigned long flags;
 817
 818         netif_stop_queue(dev);
 819         netif_carrier_off(dev);
 820         if (fep->fpi->use_napi)
 821                 napi_disable(&fep->napi);
 822         phy_stop(fep->phydev);
 823
 824         spin_lock_irqsave(&fep->lock, flags);
 825         spin_lock(&fep->tx_lock);
 826         (*fep->ops->stop)(dev);
 827         spin_unlock(&fep->tx_lock);
 828         spin_unlock_irqrestore(&fep->lock, flags);
 829
 830         /* release any irqs */
 831         phy_disconnect(fep->phydev);
 832         fep->phydev = NULL;
 833         free_irq(fep->interrupt, dev);
 834
 835         return 0;
 836 }
 837
 838 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 839 {
 840         struct fs_enet_private *fep = netdev_priv(dev);
 841         return &fep->stats;
 842 }
 843
 844 /*************************************************************************/
 845
 846 static void fs_get_drvinfo(struct net_device *dev,
 847                             struct ethtool_drvinfo *info)
 848 {
 849         strcpy(info->driver, DRV_MODULE_NAME);
 850         strcpy(info->version, DRV_MODULE_VERSION);
 851 }
 852
 853 static int fs_get_regs_len(struct net_device *dev)
 854 {
 855         struct fs_enet_private *fep = netdev_priv(dev);
 856
 857         return (*fep->ops->get_regs_len)(dev);
 858 }
 859
 860 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 861                          void *p)
 862 {
 863         struct fs_enet_private *fep = netdev_priv(dev);
 864         unsigned long flags;
 865         int r, len;
 866
 867         len = regs->len;
 868
 869         spin_lock_irqsave(&fep->lock, flags);
 870         r = (*fep->ops->get_regs)(dev, p, &len);
 871         spin_unlock_irqrestore(&fep->lock, flags);
 872
 873         if (r == 0)
 874                 regs->version = 0;
 875 }
 876
 877 static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 878 {
 879         struct fs_enet_private *fep = netdev_priv(dev);
 880
 881         if (!fep->phydev)
 882                 return -ENODEV;
 883
 884         return phy_ethtool_gset(fep->phydev, cmd);
 885 }
 886
 887 static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 888 {
 889         struct fs_enet_private *fep = netdev_priv(dev);
 890
 891         if (!fep->phydev)
 892                 return -ENODEV;
 893
 894         return phy_ethtool_sset(fep->phydev, cmd);
 895 }
 896
 897 static int fs_nway_reset(struct net_device *dev)
 898 {
 899         return 0;
 900 }
 901
 902 static u32 fs_get_msglevel(struct net_device *dev)
 903 {
 904         struct fs_enet_private *fep = netdev_priv(dev);
 905         return fep->msg_enable;
 906 }
 907
 908 static void fs_set_msglevel(struct net_device *dev, u32 value)
 909 {
 910         struct fs_enet_private *fep = netdev_priv(dev);
 911         fep->msg_enable = value;
 912 }
 913
 914 static const struct ethtool_ops fs_ethtool_ops = {
 915         .get_drvinfo = fs_get_drvinfo,
 916         .get_regs_len = fs_get_regs_len,
 917         .get_settings = fs_get_settings,
 918         .set_settings = fs_set_settings,
 919         .nway_reset = fs_nway_reset,
 920         .get_link = ethtool_op_get_link,
 921         .get_msglevel = fs_get_msglevel,
 922         .set_msglevel = fs_set_msglevel,
 923         .set_tx_csum = ethtool_op_set_tx_csum,  /* local! */
 924         .set_sg = ethtool_op_set_sg,
 925         .get_regs = fs_get_regs,
 926 };
 927
 928 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 929 {
 930         struct fs_enet_private *fep = netdev_priv(dev);
 931         struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
 932
 933         if (!netif_running(dev))
 934                 return -EINVAL;
 935
 936         return phy_mii_ioctl(fep->phydev, mii, cmd);
 937 }
 938
 939 extern int fs_mii_connect(struct net_device *dev);
 940 extern void fs_mii_disconnect(struct net_device *dev);
 941
 942 /**************************************************************************************/
 943
 944 #ifdef CONFIG_FS_ENET_HAS_FEC
 945 #define IS_FEC(match) ((match)->data == &fs_fec_ops)
 946 #else
 947 #define IS_FEC(match) 0
 948 #endif
 949
 950 static const struct net_device_ops fs_enet_netdev_ops = {
 951         .ndo_open               = fs_enet_open,
 952         .ndo_stop               = fs_enet_close,
 953         .ndo_get_stats          = fs_enet_get_stats,
 954         .ndo_start_xmit         = fs_enet_start_xmit,
 955         .ndo_tx_timeout         = fs_timeout,
 956         .ndo_set_multicast_list = fs_set_multicast_list,
 957         .ndo_do_ioctl           = fs_ioctl,
 958         .ndo_validate_addr      = eth_validate_addr,
 959         .ndo_set_mac_address    = eth_mac_addr,
 960         .ndo_change_mtu         = eth_change_mtu,
 961 #ifdef CONFIG_NET_POLL_CONTROLLER
 962         .ndo_poll_controller    = fs_enet_netpoll,
 963 #endif
 964 };
 965
 966 static int __devinit fs_enet_probe(struct of_device *ofdev,
 967                                    const struct of_device_id *match)
 968 {
 969         struct net_device *ndev;
 970         struct fs_enet_private *fep;
 971         struct fs_platform_info *fpi;
 972         const u32 *data;
 973         const u8 *mac_addr;
 974         int privsize, len, ret = -ENODEV;
 975
 976         fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
 977         if (!fpi)
 978                 return -ENOMEM;
 979
 980         if (!IS_FEC(match)) {
 981                 data = of_get_property(ofdev->node, "fsl,cpm-command", &len);
 982                 if (!data || len != 4)
 983                         goto out_free_fpi;
 984
 985                 fpi->cp_command = *data;
 986         }
 987
 988         fpi->rx_ring = 32;
 989         fpi->tx_ring = 32;
 990         fpi->rx_copybreak = 240;
 991         fpi->use_napi = 1;
 992         fpi->napi_weight = 17;
 993         fpi->phy_node = of_parse_phandle(ofdev->node, "phy-handle", 0);
 994         if ((!fpi->phy_node) && (!of_get_property(ofdev->node, "fixed-link",
 995                                                   NULL)))
 996                 goto out_free_fpi;
 997
 998         privsize = sizeof(*fep) +
 999                    sizeof(struct sk_buff **) *
1000                    (fpi->rx_ring + fpi->tx_ring);
1001
1002         ndev = alloc_etherdev(privsize);
1003         if (!ndev) {
1004                 ret = -ENOMEM;
1005                 goto out_free_fpi;
1006         }
1007
1008         dev_set_drvdata(&ofdev->dev, ndev);
1009
1010         fep = netdev_priv(ndev);
1011         fep->dev = &ofdev->dev;
1012         fep->ndev = ndev;
1013         fep->fpi = fpi;
1014         fep->ops = match->data;
1015
1016         ret = fep->ops->setup_data(ndev);
1017         if (ret)
1018                 goto out_free_dev;
1019
1020         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1021         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1022
1023         spin_lock_init(&fep->lock);
1024         spin_lock_init(&fep->tx_lock);
1025
1026         mac_addr = of_get_mac_address(ofdev->node);
1027         if (mac_addr)
1028                 memcpy(ndev->dev_addr, mac_addr, 6);
1029
1030         ret = fep->ops->allocate_bd(ndev);
1031         if (ret)
1032                 goto out_cleanup_data;
1033
1034         fep->rx_bd_base = fep->ring_base;
1035         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1036
1037         fep->tx_ring = fpi->tx_ring;
1038         fep->rx_ring = fpi->rx_ring;
1039
1040         ndev->netdev_ops = &fs_enet_netdev_ops;
1041         ndev->watchdog_timeo = 2 * HZ;
1042         if (fpi->use_napi)
1043                 netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi,
1044                                fpi->napi_weight);
1045
1046         ndev->ethtool_ops = &fs_ethtool_ops;
1047
1048         init_timer(&fep->phy_timer_list);
1049
1050         netif_carrier_off(ndev);
1051
1052         ret = register_netdev(ndev);
1053         if (ret)
1054                 goto out_free_bd;
1055
1056         printk(KERN_INFO "%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
1057
1058         return 0;
1059
1060 out_free_bd:
1061         fep->ops->free_bd(ndev);
1062 out_cleanup_data:
1063         fep->ops->cleanup_data(ndev);
1064 out_free_dev:
1065         free_netdev(ndev);
1066         dev_set_drvdata(&ofdev->dev, NULL);
1067         of_node_put(fpi->phy_node);
1068 out_free_fpi:
1069         kfree(fpi);
1070         return ret;
1071 }
1072
1073 static int fs_enet_remove(struct of_device *ofdev)
1074 {
1075         struct net_device *ndev = dev_get_drvdata(&ofdev->dev);
1076         struct fs_enet_private *fep = netdev_priv(ndev);
1077
1078         unregister_netdev(ndev);
1079
1080         fep->ops->free_bd(ndev);
1081         fep->ops->cleanup_data(ndev);
1082         dev_set_drvdata(fep->dev, NULL);
1083         of_node_put(fep->fpi->phy_node);
1084         free_netdev(ndev);
1085         return 0;
1086 }
1087
1088 static struct of_device_id fs_enet_match[] = {
1089 #ifdef CONFIG_FS_ENET_HAS_SCC
1090         {
1091                 .compatible = "fsl,cpm1-scc-enet",
1092                 .data = (void *)&fs_scc_ops,
1093         },
1094         {
1095                 .compatible = "fsl,cpm2-scc-enet",
1096                 .data = (void *)&fs_scc_ops,
1097         },
1098 #endif
1099 #ifdef CONFIG_FS_ENET_HAS_FCC
1100         {
1101                 .compatible = "fsl,cpm2-fcc-enet",
1102                 .data = (void *)&fs_fcc_ops,
1103         },
1104 #endif
1105 #ifdef CONFIG_FS_ENET_HAS_FEC
1106         {
1107                 .compatible = "fsl,pq1-fec-enet",
1108                 .data = (void *)&fs_fec_ops,
1109         },
1110 #endif
1111         {}
1112 };
1113
1114 static struct of_platform_driver fs_enet_driver = {
1115         .name   = "fs_enet",
1116         .match_table = fs_enet_match,
1117         .probe = fs_enet_probe,
1118         .remove = fs_enet_remove,
1119 };
1120
1121 static int __init fs_init(void)
1122 {
1123         return of_register_platform_driver(&fs_enet_driver);
1124 }
1125
1126 static void __exit fs_cleanup(void)
1127 {
1128         of_unregister_platform_driver(&fs_enet_driver);
1129 }
1130
1131 #ifdef CONFIG_NET_POLL_CONTROLLER
1132 static void fs_enet_netpoll(struct net_device *dev)
1133 {
1134        disable_irq(dev->irq);
1135        fs_enet_interrupt(dev->irq, dev);
1136        enable_irq(dev->irq);
1137 }
1138 #endif
1139
1140 /**************************************************************************************/
1141
1142 module_init(fs_init);
1143 module_exit(fs_cleanup);