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 #include <linux/of_net.h>
  44
  45 #include <linux/vmalloc.h>
  46 #include <asm/pgtable.h>
  47 #include <asm/irq.h>
  48 #include <asm/uaccess.h>
  49
  50 #include "fs_enet.h"
  51
  52 /*************************************************/
  53
  54 MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  55 MODULE_DESCRIPTION("Freescale Ethernet Driver");
  56 MODULE_LICENSE("GPL");
  57 MODULE_VERSION(DRV_MODULE_VERSION);
  58
  59 static int fs_enet_debug = -1; /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
  60 module_param(fs_enet_debug, int, 0);
  61 MODULE_PARM_DESC(fs_enet_debug,
  62                  "Freescale bitmapped debugging message enable value");
  63
  64 #ifdef CONFIG_NET_POLL_CONTROLLER
  65 static void fs_enet_netpoll(struct net_device *dev);
  66 #endif
  67
  68 static void fs_set_multicast_list(struct net_device *dev)
  69 {
  70         struct fs_enet_private *fep = netdev_priv(dev);
  71
  72         (*fep->ops->set_multicast_list)(dev);
  73 }
  74
  75 static void skb_align(struct sk_buff *skb, int align)
  76 {
  77         int off = ((unsigned long)skb->data) & (align - 1);
  78
  79         if (off)
  80                 skb_reserve(skb, align - off);
  81 }
  82
  83 /* NAPI receive function */
  84 static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
  85 {
  86         struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
  87         struct net_device *dev = fep->ndev;
  88         const struct fs_platform_info *fpi = fep->fpi;
  89         cbd_t __iomem *bdp;
  90         struct sk_buff *skb, *skbn, *skbt;
  91         int received = 0;
  92         u16 pkt_len, sc;
  93         int curidx;
  94
  95         /*
  96          * First, grab all of the stats for the incoming packet.
  97          * These get messed up if we get called due to a busy condition.
  98          */
  99         bdp = fep->cur_rx;
 100
 101         /* clear RX status bits for napi*/
 102         (*fep->ops->napi_clear_rx_event)(dev);
 103
 104         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 105                 curidx = bdp - fep->rx_bd_base;
 106
 107                 /*
 108                  * Since we have allocated space to hold a complete frame,
 109                  * the last indicator should be set.
 110                  */
 111                 if ((sc & BD_ENET_RX_LAST) == 0)
 112                         dev_warn(fep->dev, "rcv is not +last\n");
 113
 114                 /*
 115                  * Check for errors.
 116                  */
 117                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 118                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 119                         fep->stats.rx_errors++;
 120                         /* Frame too long or too short. */
 121                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 122                                 fep->stats.rx_length_errors++;
 123                         /* Frame alignment */
 124                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 125                                 fep->stats.rx_frame_errors++;
 126                         /* CRC Error */
 127                         if (sc & BD_ENET_RX_CR)
 128                                 fep->stats.rx_crc_errors++;
 129                         /* FIFO overrun */
 130                         if (sc & BD_ENET_RX_OV)
 131                                 fep->stats.rx_crc_errors++;
 132
 133                         skb = fep->rx_skbuff[curidx];
 134
 135                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 136                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 137                                 DMA_FROM_DEVICE);
 138
 139                         skbn = skb;
 140
 141                 } else {
 142                         skb = fep->rx_skbuff[curidx];
 143
 144                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 145                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 146                                 DMA_FROM_DEVICE);
 147
 148                         /*
 149                          * Process the incoming frame.
 150                          */
 151                         fep->stats.rx_packets++;
 152                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 153                         fep->stats.rx_bytes += pkt_len + 4;
 154
 155                         if (pkt_len <= fpi->rx_copybreak) {
 156                                 /* +2 to make IP header L1 cache aligned */
 157                                 skbn = dev_alloc_skb(pkt_len + 2);
 158                                 if (skbn != NULL) {
 159                                         skb_reserve(skbn, 2);   /* align IP header */
 160                                         skb_copy_from_linear_data(skb,
 161                                                       skbn->data, pkt_len);
 162                                         /* swap */
 163                                         skbt = skb;
 164                                         skb = skbn;
 165                                         skbn = skbt;
 166                                 }
 167                         } else {
 168                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 169
 170                                 if (skbn)
 171                                         skb_align(skbn, ENET_RX_ALIGN);
 172                         }
 173
 174                         if (skbn != NULL) {
 175                                 skb_put(skb, pkt_len);  /* Make room */
 176                                 skb->protocol = eth_type_trans(skb, dev);
 177                                 received++;
 178                                 netif_receive_skb(skb);
 179                         } else {
 180                                 dev_warn(fep->dev,
 181                                          "Memory squeeze, dropping packet.\n");
 182                                 fep->stats.rx_dropped++;
 183                                 skbn = skb;
 184                         }
 185                 }
 186
 187                 fep->rx_skbuff[curidx] = skbn;
 188                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 189                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 190                              DMA_FROM_DEVICE));
 191                 CBDW_DATLEN(bdp, 0);
 192                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 193
 194                 /*
 195                  * Update BD pointer to next entry.
 196                  */
 197                 if ((sc & BD_ENET_RX_WRAP) == 0)
 198                         bdp++;
 199                 else
 200                         bdp = fep->rx_bd_base;
 201
 202                 (*fep->ops->rx_bd_done)(dev);
 203
 204                 if (received >= budget)
 205                         break;
 206         }
 207
 208         fep->cur_rx = bdp;
 209
 210         if (received < budget) {
 211                 /* done */
 212                 napi_complete(napi);
 213                 (*fep->ops->napi_enable_rx)(dev);
 214         }
 215         return received;
 216 }
 217
 218 /* non NAPI receive function */
 219 static int fs_enet_rx_non_napi(struct net_device *dev)
 220 {
 221         struct fs_enet_private *fep = netdev_priv(dev);
 222         const struct fs_platform_info *fpi = fep->fpi;
 223         cbd_t __iomem *bdp;
 224         struct sk_buff *skb, *skbn, *skbt;
 225         int received = 0;
 226         u16 pkt_len, sc;
 227         int curidx;
 228         /*
 229          * First, grab all of the stats for the incoming packet.
 230          * These get messed up if we get called due to a busy condition.
 231          */
 232         bdp = fep->cur_rx;
 233
 234         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 235
 236                 curidx = bdp - fep->rx_bd_base;
 237
 238                 /*
 239                  * Since we have allocated space to hold a complete frame,
 240                  * the last indicator should be set.
 241                  */
 242                 if ((sc & BD_ENET_RX_LAST) == 0)
 243                         dev_warn(fep->dev, "rcv is not +last\n");
 244
 245                 /*
 246                  * Check for errors.
 247                  */
 248                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 249                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 250                         fep->stats.rx_errors++;
 251                         /* Frame too long or too short. */
 252                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 253                                 fep->stats.rx_length_errors++;
 254                         /* Frame alignment */
 255                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 256                                 fep->stats.rx_frame_errors++;
 257                         /* CRC Error */
 258                         if (sc & BD_ENET_RX_CR)
 259                                 fep->stats.rx_crc_errors++;
 260                         /* FIFO overrun */
 261                         if (sc & BD_ENET_RX_OV)
 262                                 fep->stats.rx_crc_errors++;
 263
 264                         skb = fep->rx_skbuff[curidx];
 265
 266                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 267                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 268                                 DMA_FROM_DEVICE);
 269
 270                         skbn = skb;
 271
 272                 } else {
 273
 274                         skb = fep->rx_skbuff[curidx];
 275
 276                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 277                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 278                                 DMA_FROM_DEVICE);
 279
 280                         /*
 281                          * Process the incoming frame.
 282                          */
 283                         fep->stats.rx_packets++;
 284                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 285                         fep->stats.rx_bytes += pkt_len + 4;
 286
 287                         if (pkt_len <= fpi->rx_copybreak) {
 288                                 /* +2 to make IP header L1 cache aligned */
 289                                 skbn = dev_alloc_skb(pkt_len + 2);
 290                                 if (skbn != NULL) {
 291                                         skb_reserve(skbn, 2);   /* align IP header */
 292                                         skb_copy_from_linear_data(skb,
 293                                                       skbn->data, pkt_len);
 294                                         /* swap */
 295                                         skbt = skb;
 296                                         skb = skbn;
 297                                         skbn = skbt;
 298                                 }
 299                         } else {
 300                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 301
 302                                 if (skbn)
 303                                         skb_align(skbn, ENET_RX_ALIGN);
 304                         }
 305
 306                         if (skbn != NULL) {
 307                                 skb_put(skb, pkt_len);  /* Make room */
 308                                 skb->protocol = eth_type_trans(skb, dev);
 309                                 received++;
 310                                 netif_rx(skb);
 311                         } else {
 312                                 dev_warn(fep->dev,
 313                                          "Memory squeeze, dropping packet.\n");
 314                                 fep->stats.rx_dropped++;
 315                                 skbn = skb;
 316                         }
 317                 }
 318
 319                 fep->rx_skbuff[curidx] = skbn;
 320                 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
 321                              L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 322                              DMA_FROM_DEVICE));
 323                 CBDW_DATLEN(bdp, 0);
 324                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 325
 326                 /*
 327                  * Update BD pointer to next entry.
 328                  */
 329                 if ((sc & BD_ENET_RX_WRAP) == 0)
 330                         bdp++;
 331                 else
 332                         bdp = fep->rx_bd_base;
 333
 334                 (*fep->ops->rx_bd_done)(dev);
 335         }
 336
 337         fep->cur_rx = bdp;
 338
 339         return 0;
 340 }
 341
 342 static void fs_enet_tx(struct net_device *dev)
 343 {
 344         struct fs_enet_private *fep = netdev_priv(dev);
 345         cbd_t __iomem *bdp;
 346         struct sk_buff *skb;
 347         int dirtyidx, do_wake, do_restart;
 348         u16 sc;
 349
 350         spin_lock(&fep->tx_lock);
 351         bdp = fep->dirty_tx;
 352
 353         do_wake = do_restart = 0;
 354         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
 355                 dirtyidx = bdp - fep->tx_bd_base;
 356
 357                 if (fep->tx_free == fep->tx_ring)
 358                         break;
 359
 360                 skb = fep->tx_skbuff[dirtyidx];
 361
 362                 /*
 363                  * Check for errors.
 364                  */
 365                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 366                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 367
 368                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 369                                 fep->stats.tx_heartbeat_errors++;
 370                         if (sc & BD_ENET_TX_LC) /* Late collision */
 371                                 fep->stats.tx_window_errors++;
 372                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 373                                 fep->stats.tx_aborted_errors++;
 374                         if (sc & BD_ENET_TX_UN) /* Underrun */
 375                                 fep->stats.tx_fifo_errors++;
 376                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 377                                 fep->stats.tx_carrier_errors++;
 378
 379                         if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
 380                                 fep->stats.tx_errors++;
 381                                 do_restart = 1;
 382                         }
 383                 } else
 384                         fep->stats.tx_packets++;
 385
 386                 if (sc & BD_ENET_TX_READY) {
 387                         dev_warn(fep->dev,
 388                                  "HEY! Enet xmit interrupt and TX_READY.\n");
 389                 }
 390
 391                 /*
 392                  * Deferred means some collisions occurred during transmit,
 393                  * but we eventually sent the packet OK.
 394                  */
 395                 if (sc & BD_ENET_TX_DEF)
 396                         fep->stats.collisions++;
 397
 398                 /* unmap */
 399                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 400                                 skb->len, DMA_TO_DEVICE);
 401
 402                 /*
 403                  * Free the sk buffer associated with this last transmit.
 404                  */
 405                 dev_kfree_skb_irq(skb);
 406                 fep->tx_skbuff[dirtyidx] = NULL;
 407
 408                 /*
 409                  * Update pointer to next buffer descriptor to be transmitted.
 410                  */
 411                 if ((sc & BD_ENET_TX_WRAP) == 0)
 412                         bdp++;
 413                 else
 414                         bdp = fep->tx_bd_base;
 415
 416                 /*
 417                  * Since we have freed up a buffer, the ring is no longer
 418                  * full.
 419                  */
 420                 if (!fep->tx_free++)
 421                         do_wake = 1;
 422         }
 423
 424         fep->dirty_tx = bdp;
 425
 426         if (do_restart)
 427                 (*fep->ops->tx_restart)(dev);
 428
 429         spin_unlock(&fep->tx_lock);
 430
 431         if (do_wake)
 432                 netif_wake_queue(dev);
 433 }
 434
 435 /*
 436  * The interrupt handler.
 437  * This is called from the MPC core interrupt.
 438  */
 439 static irqreturn_t
 440 fs_enet_interrupt(int irq, void *dev_id)
 441 {
 442         struct net_device *dev = dev_id;
 443         struct fs_enet_private *fep;
 444         const struct fs_platform_info *fpi;
 445         u32 int_events;
 446         u32 int_clr_events;
 447         int nr, napi_ok;
 448         int handled;
 449
 450         fep = netdev_priv(dev);
 451         fpi = fep->fpi;
 452
 453         nr = 0;
 454         while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
 455                 nr++;
 456
 457                 int_clr_events = int_events;
 458                 if (fpi->use_napi)
 459                         int_clr_events &= ~fep->ev_napi_rx;
 460
 461                 (*fep->ops->clear_int_events)(dev, int_clr_events);
 462
 463                 if (int_events & fep->ev_err)
 464                         (*fep->ops->ev_error)(dev, int_events);
 465
 466                 if (int_events & fep->ev_rx) {
 467                         if (!fpi->use_napi)
 468                                 fs_enet_rx_non_napi(dev);
 469                         else {
 470                                 napi_ok = napi_schedule_prep(&fep->napi);
 471
 472                                 (*fep->ops->napi_disable_rx)(dev);
 473                                 (*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
 474
 475                                 /* NOTE: it is possible for FCCs in NAPI mode    */
 476                                 /* to submit a spurious interrupt while in poll  */
 477                                 if (napi_ok)
 478                                         __napi_schedule(&fep->napi);
 479                         }
 480                 }
 481
 482                 if (int_events & fep->ev_tx)
 483                         fs_enet_tx(dev);
 484         }
 485
 486         handled = nr > 0;
 487         return IRQ_RETVAL(handled);
 488 }
 489
 490 void fs_init_bds(struct net_device *dev)
 491 {
 492         struct fs_enet_private *fep = netdev_priv(dev);
 493         cbd_t __iomem *bdp;
 494         struct sk_buff *skb;
 495         int i;
 496
 497         fs_cleanup_bds(dev);
 498
 499         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 500         fep->tx_free = fep->tx_ring;
 501         fep->cur_rx = fep->rx_bd_base;
 502
 503         /*
 504          * Initialize the receive buffer descriptors.
 505          */
 506         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 507                 skb = dev_alloc_skb(ENET_RX_FRSIZE);
 508                 if (skb == NULL) {
 509                         dev_warn(fep->dev,
 510                                  "Memory squeeze, unable to allocate skb\n");
 511                         break;
 512                 }
 513                 skb_align(skb, ENET_RX_ALIGN);
 514                 fep->rx_skbuff[i] = skb;
 515                 CBDW_BUFADDR(bdp,
 516                         dma_map_single(fep->dev, skb->data,
 517                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 518                                 DMA_FROM_DEVICE));
 519                 CBDW_DATLEN(bdp, 0);    /* zero */
 520                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 521                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 522         }
 523         /*
 524          * if we failed, fillup remainder
 525          */
 526         for (; i < fep->rx_ring; i++, bdp++) {
 527                 fep->rx_skbuff[i] = NULL;
 528                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 529         }
 530
 531         /*
 532          * ...and the same for transmit.
 533          */
 534         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 535                 fep->tx_skbuff[i] = NULL;
 536                 CBDW_BUFADDR(bdp, 0);
 537                 CBDW_DATLEN(bdp, 0);
 538                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 539         }
 540 }
 541
 542 void fs_cleanup_bds(struct net_device *dev)
 543 {
 544         struct fs_enet_private *fep = netdev_priv(dev);
 545         struct sk_buff *skb;
 546         cbd_t __iomem *bdp;
 547         int i;
 548
 549         /*
 550          * Reset SKB transmit buffers.
 551          */
 552         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 553                 if ((skb = fep->tx_skbuff[i]) == NULL)
 554                         continue;
 555
 556                 /* unmap */
 557                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 558                                 skb->len, DMA_TO_DEVICE);
 559
 560                 fep->tx_skbuff[i] = NULL;
 561                 dev_kfree_skb(skb);
 562         }
 563
 564         /*
 565          * Reset SKB receive buffers
 566          */
 567         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 568                 if ((skb = fep->rx_skbuff[i]) == NULL)
 569                         continue;
 570
 571                 /* unmap */
 572                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 573                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 574                         DMA_FROM_DEVICE);
 575
 576                 fep->rx_skbuff[i] = NULL;
 577
 578                 dev_kfree_skb(skb);
 579         }
 580 }
 581
 582 /**********************************************************************************/
 583
 584 #ifdef CONFIG_FS_ENET_MPC5121_FEC
 585 /*
 586  * MPC5121 FEC requeries 4-byte alignment for TX data buffer!
 587  */
 588 static struct sk_buff *tx_skb_align_workaround(struct net_device *dev,
 589                                                struct sk_buff *skb)
 590 {
 591         struct sk_buff *new_skb;
 592         struct fs_enet_private *fep = netdev_priv(dev);
 593
 594         /* Alloc new skb */
 595         new_skb = dev_alloc_skb(skb->len + 4);
 596         if (!new_skb) {
 597                 if (net_ratelimit()) {
 598                         dev_warn(fep->dev,
 599                                  "Memory squeeze, dropping tx packet.\n");
 600                 }
 601                 return NULL;
 602         }
 603
 604         /* Make sure new skb is properly aligned */
 605         skb_align(new_skb, 4);
 606
 607         /* Copy data to new skb ... */
 608         skb_copy_from_linear_data(skb, new_skb->data, skb->len);
 609         skb_put(new_skb, skb->len);
 610
 611         /* ... and free an old one */
 612         dev_kfree_skb_any(skb);
 613
 614         return new_skb;
 615 }
 616 #endif
 617
 618 static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 619 {
 620         struct fs_enet_private *fep = netdev_priv(dev);
 621         cbd_t __iomem *bdp;
 622         int curidx;
 623         u16 sc;
 624         unsigned long flags;
 625
 626 #ifdef CONFIG_FS_ENET_MPC5121_FEC
 627         if (((unsigned long)skb->data) & 0x3) {
 628                 skb = tx_skb_align_workaround(dev, skb);
 629                 if (!skb) {
 630                         /*
 631                          * We have lost packet due to memory allocation error
 632                          * in tx_skb_align_workaround(). Hopefully original
 633                          * skb is still valid, so try transmit it later.
 634                          */
 635                         return NETDEV_TX_BUSY;
 636                 }
 637         }
 638 #endif
 639         spin_lock_irqsave(&fep->tx_lock, flags);
 640
 641         /*
 642          * Fill in a Tx ring entry
 643          */
 644         bdp = fep->cur_tx;
 645
 646         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 647                 netif_stop_queue(dev);
 648                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 649
 650                 /*
 651                  * Ooops.  All transmit buffers are full.  Bail out.
 652                  * This should not happen, since the tx queue should be stopped.
 653                  */
 654                 dev_warn(fep->dev, "tx queue full!.\n");
 655                 return NETDEV_TX_BUSY;
 656         }
 657
 658         curidx = bdp - fep->tx_bd_base;
 659         /*
 660          * Clear all of the status flags.
 661          */
 662         CBDC_SC(bdp, BD_ENET_TX_STATS);
 663
 664         /*
 665          * Save skb pointer.
 666          */
 667         fep->tx_skbuff[curidx] = skb;
 668
 669         fep->stats.tx_bytes += skb->len;
 670
 671         /*
 672          * Push the data cache so the CPM does not get stale memory data.
 673          */
 674         CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
 675                                 skb->data, skb->len, DMA_TO_DEVICE));
 676         CBDW_DATLEN(bdp, skb->len);
 677
 678         /*
 679          * If this was the last BD in the ring, start at the beginning again.
 680          */
 681         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 682                 fep->cur_tx++;
 683         else
 684                 fep->cur_tx = fep->tx_bd_base;
 685
 686         if (!--fep->tx_free)
 687                 netif_stop_queue(dev);
 688
 689         /* Trigger transmission start */
 690         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 691              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 692
 693         /* note that while FEC does not have this bit
 694          * it marks it as available for software use
 695          * yay for hw reuse :) */
 696         if (skb->len <= 60)
 697                 sc |= BD_ENET_TX_PAD;
 698         CBDS_SC(bdp, sc);
 699
 700         (*fep->ops->tx_kickstart)(dev);
 701
 702         spin_unlock_irqrestore(&fep->tx_lock, flags);
 703
 704         return NETDEV_TX_OK;
 705 }
 706
 707 static void fs_timeout(struct net_device *dev)
 708 {
 709         struct fs_enet_private *fep = netdev_priv(dev);
 710         unsigned long flags;
 711         int wake = 0;
 712
 713         fep->stats.tx_errors++;
 714
 715         spin_lock_irqsave(&fep->lock, flags);
 716
 717         if (dev->flags & IFF_UP) {
 718                 phy_stop(fep->phydev);
 719                 (*fep->ops->stop)(dev);
 720                 (*fep->ops->restart)(dev);
 721                 phy_start(fep->phydev);
 722         }
 723
 724         phy_start(fep->phydev);
 725         wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 726         spin_unlock_irqrestore(&fep->lock, flags);
 727
 728         if (wake)
 729                 netif_wake_queue(dev);
 730 }
 731
 732 /*-----------------------------------------------------------------------------
 733  *  generic link-change handler - should be sufficient for most cases
 734  *-----------------------------------------------------------------------------*/
 735 static void generic_adjust_link(struct  net_device *dev)
 736 {
 737         struct fs_enet_private *fep = netdev_priv(dev);
 738         struct phy_device *phydev = fep->phydev;
 739         int new_state = 0;
 740
 741         if (phydev->link) {
 742                 /* adjust to duplex mode */
 743                 if (phydev->duplex != fep->oldduplex) {
 744                         new_state = 1;
 745                         fep->oldduplex = phydev->duplex;
 746                 }
 747
 748                 if (phydev->speed != fep->oldspeed) {
 749                         new_state = 1;
 750                         fep->oldspeed = phydev->speed;
 751                 }
 752
 753                 if (!fep->oldlink) {
 754                         new_state = 1;
 755                         fep->oldlink = 1;
 756                 }
 757
 758                 if (new_state)
 759                         fep->ops->restart(dev);
 760         } else if (fep->oldlink) {
 761                 new_state = 1;
 762                 fep->oldlink = 0;
 763                 fep->oldspeed = 0;
 764                 fep->oldduplex = -1;
 765         }
 766
 767         if (new_state && netif_msg_link(fep))
 768                 phy_print_status(phydev);
 769 }
 770
 771
 772 static void fs_adjust_link(struct net_device *dev)
 773 {
 774         struct fs_enet_private *fep = netdev_priv(dev);
 775         unsigned long flags;
 776
 777         spin_lock_irqsave(&fep->lock, flags);
 778
 779         if(fep->ops->adjust_link)
 780                 fep->ops->adjust_link(dev);
 781         else
 782                 generic_adjust_link(dev);
 783
 784         spin_unlock_irqrestore(&fep->lock, flags);
 785 }
 786
 787 static int fs_init_phy(struct net_device *dev)
 788 {
 789         struct fs_enet_private *fep = netdev_priv(dev);
 790         struct phy_device *phydev;
 791
 792         fep->oldlink = 0;
 793         fep->oldspeed = 0;
 794         fep->oldduplex = -1;
 795
 796         phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
 797                                 PHY_INTERFACE_MODE_MII);
 798         if (!phydev) {
 799                 phydev = of_phy_connect_fixed_link(dev, &fs_adjust_link,
 800                                                    PHY_INTERFACE_MODE_MII);
 801         }
 802         if (!phydev) {
 803                 dev_err(&dev->dev, "Could not attach to PHY\n");
 804                 return -ENODEV;
 805         }
 806
 807         fep->phydev = phydev;
 808
 809         return 0;
 810 }
 811
 812 static int fs_enet_open(struct net_device *dev)
 813 {
 814         struct fs_enet_private *fep = netdev_priv(dev);
 815         int r;
 816         int err;
 817
 818         /* to initialize the fep->cur_rx,... */
 819         /* not doing this, will cause a crash in fs_enet_rx_napi */
 820         fs_init_bds(fep->ndev);
 821
 822         if (fep->fpi->use_napi)
 823                 napi_enable(&fep->napi);
 824
 825         /* Install our interrupt handler. */
 826         r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
 827                         "fs_enet-mac", dev);
 828         if (r != 0) {
 829                 dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
 830                 if (fep->fpi->use_napi)
 831                         napi_disable(&fep->napi);
 832                 return -EINVAL;
 833         }
 834
 835         err = fs_init_phy(dev);
 836         if (err) {
 837                 free_irq(fep->interrupt, dev);
 838                 if (fep->fpi->use_napi)
 839                         napi_disable(&fep->napi);
 840                 return err;
 841         }
 842         phy_start(fep->phydev);
 843
 844         netif_start_queue(dev);
 845
 846         return 0;
 847 }
 848
 849 static int fs_enet_close(struct net_device *dev)
 850 {
 851         struct fs_enet_private *fep = netdev_priv(dev);
 852         unsigned long flags;
 853
 854         netif_stop_queue(dev);
 855         netif_carrier_off(dev);
 856         if (fep->fpi->use_napi)
 857                 napi_disable(&fep->napi);
 858         phy_stop(fep->phydev);
 859
 860         spin_lock_irqsave(&fep->lock, flags);
 861         spin_lock(&fep->tx_lock);
 862         (*fep->ops->stop)(dev);
 863         spin_unlock(&fep->tx_lock);
 864         spin_unlock_irqrestore(&fep->lock, flags);
 865
 866         /* release any irqs */
 867         phy_disconnect(fep->phydev);
 868         fep->phydev = NULL;
 869         free_irq(fep->interrupt, dev);
 870
 871         return 0;
 872 }
 873
 874 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 875 {
 876         struct fs_enet_private *fep = netdev_priv(dev);
 877         return &fep->stats;
 878 }
 879
 880 /*************************************************************************/
 881
 882 static void fs_get_drvinfo(struct net_device *dev,
 883                             struct ethtool_drvinfo *info)
 884 {
 885         strcpy(info->driver, DRV_MODULE_NAME);
 886         strcpy(info->version, DRV_MODULE_VERSION);
 887 }
 888
 889 static int fs_get_regs_len(struct net_device *dev)
 890 {
 891         struct fs_enet_private *fep = netdev_priv(dev);
 892
 893         return (*fep->ops->get_regs_len)(dev);
 894 }
 895
 896 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 897                          void *p)
 898 {
 899         struct fs_enet_private *fep = netdev_priv(dev);
 900         unsigned long flags;
 901         int r, len;
 902
 903         len = regs->len;
 904
 905         spin_lock_irqsave(&fep->lock, flags);
 906         r = (*fep->ops->get_regs)(dev, p, &len);
 907         spin_unlock_irqrestore(&fep->lock, flags);
 908
 909         if (r == 0)
 910                 regs->version = 0;
 911 }
 912
 913 static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 914 {
 915         struct fs_enet_private *fep = netdev_priv(dev);
 916
 917         if (!fep->phydev)
 918                 return -ENODEV;
 919
 920         return phy_ethtool_gset(fep->phydev, cmd);
 921 }
 922
 923 static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 924 {
 925         struct fs_enet_private *fep = netdev_priv(dev);
 926
 927         if (!fep->phydev)
 928                 return -ENODEV;
 929
 930         return phy_ethtool_sset(fep->phydev, cmd);
 931 }
 932
 933 static int fs_nway_reset(struct net_device *dev)
 934 {
 935         return 0;
 936 }
 937
 938 static u32 fs_get_msglevel(struct net_device *dev)
 939 {
 940         struct fs_enet_private *fep = netdev_priv(dev);
 941         return fep->msg_enable;
 942 }
 943
 944 static void fs_set_msglevel(struct net_device *dev, u32 value)
 945 {
 946         struct fs_enet_private *fep = netdev_priv(dev);
 947         fep->msg_enable = value;
 948 }
 949
 950 static const struct ethtool_ops fs_ethtool_ops = {
 951         .get_drvinfo = fs_get_drvinfo,
 952         .get_regs_len = fs_get_regs_len,
 953         .get_settings = fs_get_settings,
 954         .set_settings = fs_set_settings,
 955         .nway_reset = fs_nway_reset,
 956         .get_link = ethtool_op_get_link,
 957         .get_msglevel = fs_get_msglevel,
 958         .set_msglevel = fs_set_msglevel,
 959         .get_regs = fs_get_regs,
 960 };
 961
 962 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 963 {
 964         struct fs_enet_private *fep = netdev_priv(dev);
 965
 966         if (!netif_running(dev))
 967                 return -EINVAL;
 968
 969         return phy_mii_ioctl(fep->phydev, rq, cmd);
 970 }
 971
 972 extern int fs_mii_connect(struct net_device *dev);
 973 extern void fs_mii_disconnect(struct net_device *dev);
 974
 975 /**************************************************************************************/
 976
 977 #ifdef CONFIG_FS_ENET_HAS_FEC
 978 #define IS_FEC(match) ((match)->data == &fs_fec_ops)
 979 #else
 980 #define IS_FEC(match) 0
 981 #endif
 982
 983 static const struct net_device_ops fs_enet_netdev_ops = {
 984         .ndo_open               = fs_enet_open,
 985         .ndo_stop               = fs_enet_close,
 986         .ndo_get_stats          = fs_enet_get_stats,
 987         .ndo_start_xmit         = fs_enet_start_xmit,
 988         .ndo_tx_timeout         = fs_timeout,
 989         .ndo_set_multicast_list = fs_set_multicast_list,
 990         .ndo_do_ioctl           = fs_ioctl,
 991         .ndo_validate_addr      = eth_validate_addr,
 992         .ndo_set_mac_address    = eth_mac_addr,
 993         .ndo_change_mtu         = eth_change_mtu,
 994 #ifdef CONFIG_NET_POLL_CONTROLLER
 995         .ndo_poll_controller    = fs_enet_netpoll,
 996 #endif
 997 };
 998
 999 static struct of_device_id fs_enet_match[];
1000 static int __devinit fs_enet_probe(struct platform_device *ofdev)
1001 {
1002         const struct of_device_id *match;
1003         struct net_device *ndev;
1004         struct fs_enet_private *fep;
1005         struct fs_platform_info *fpi;
1006         const u32 *data;
1007         const u8 *mac_addr;
1008         int privsize, len, ret = -ENODEV;
1009
1010         match = of_match_device(fs_enet_match, &ofdev->dev);
1011         if (!match)
1012                 return -EINVAL;
1013
1014         fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
1015         if (!fpi)
1016                 return -ENOMEM;
1017
1018         if (!IS_FEC(match)) {
1019                 data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
1020                 if (!data || len != 4)
1021                         goto out_free_fpi;
1022
1023                 fpi->cp_command = *data;
1024         }
1025
1026         fpi->rx_ring = 32;
1027         fpi->tx_ring = 32;
1028         fpi->rx_copybreak = 240;
1029         fpi->use_napi = 1;
1030         fpi->napi_weight = 17;
1031         fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
1032         if ((!fpi->phy_node) && (!of_get_property(ofdev->dev.of_node, "fixed-link",
1033                                                   NULL)))
1034                 goto out_free_fpi;
1035
1036         privsize = sizeof(*fep) +
1037                    sizeof(struct sk_buff **) *
1038                    (fpi->rx_ring + fpi->tx_ring);
1039
1040         ndev = alloc_etherdev(privsize);
1041         if (!ndev) {
1042                 ret = -ENOMEM;
1043                 goto out_put;
1044         }
1045
1046         SET_NETDEV_DEV(ndev, &ofdev->dev);
1047         dev_set_drvdata(&ofdev->dev, ndev);
1048
1049         fep = netdev_priv(ndev);
1050         fep->dev = &ofdev->dev;
1051         fep->ndev = ndev;
1052         fep->fpi = fpi;
1053         fep->ops = match->data;
1054
1055         ret = fep->ops->setup_data(ndev);
1056         if (ret)
1057                 goto out_free_dev;
1058
1059         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1060         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1061
1062         spin_lock_init(&fep->lock);
1063         spin_lock_init(&fep->tx_lock);
1064
1065         mac_addr = of_get_mac_address(ofdev->dev.of_node);
1066         if (mac_addr)
1067                 memcpy(ndev->dev_addr, mac_addr, 6);
1068
1069         ret = fep->ops->allocate_bd(ndev);
1070         if (ret)
1071                 goto out_cleanup_data;
1072
1073         fep->rx_bd_base = fep->ring_base;
1074         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1075
1076         fep->tx_ring = fpi->tx_ring;
1077         fep->rx_ring = fpi->rx_ring;
1078
1079         ndev->netdev_ops = &fs_enet_netdev_ops;
1080         ndev->watchdog_timeo = 2 * HZ;
1081         if (fpi->use_napi)
1082                 netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi,
1083                                fpi->napi_weight);
1084
1085         ndev->ethtool_ops = &fs_ethtool_ops;
1086
1087         init_timer(&fep->phy_timer_list);
1088
1089         netif_carrier_off(ndev);
1090
1091         ret = register_netdev(ndev);
1092         if (ret)
1093                 goto out_free_bd;
1094
1095         pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
1096
1097         return 0;
1098
1099 out_free_bd:
1100         fep->ops->free_bd(ndev);
1101 out_cleanup_data:
1102         fep->ops->cleanup_data(ndev);
1103 out_free_dev:
1104         free_netdev(ndev);
1105         dev_set_drvdata(&ofdev->dev, NULL);
1106 out_put:
1107         of_node_put(fpi->phy_node);
1108 out_free_fpi:
1109         kfree(fpi);
1110         return ret;
1111 }
1112
1113 static int fs_enet_remove(struct platform_device *ofdev)
1114 {
1115         struct net_device *ndev = dev_get_drvdata(&ofdev->dev);
1116         struct fs_enet_private *fep = netdev_priv(ndev);
1117
1118         unregister_netdev(ndev);
1119
1120         fep->ops->free_bd(ndev);
1121         fep->ops->cleanup_data(ndev);
1122         dev_set_drvdata(fep->dev, NULL);
1123         of_node_put(fep->fpi->phy_node);
1124         free_netdev(ndev);
1125         return 0;
1126 }
1127
1128 static struct of_device_id fs_enet_match[] = {
1129 #ifdef CONFIG_FS_ENET_HAS_SCC
1130         {
1131                 .compatible = "fsl,cpm1-scc-enet",
1132                 .data = (void *)&fs_scc_ops,
1133         },
1134         {
1135                 .compatible = "fsl,cpm2-scc-enet",
1136                 .data = (void *)&fs_scc_ops,
1137         },
1138 #endif
1139 #ifdef CONFIG_FS_ENET_HAS_FCC
1140         {
1141                 .compatible = "fsl,cpm2-fcc-enet",
1142                 .data = (void *)&fs_fcc_ops,
1143         },
1144 #endif
1145 #ifdef CONFIG_FS_ENET_HAS_FEC
1146 #ifdef CONFIG_FS_ENET_MPC5121_FEC
1147         {
1148                 .compatible = "fsl,mpc5121-fec",
1149                 .data = (void *)&fs_fec_ops,
1150         },
1151 #else
1152         {
1153                 .compatible = "fsl,pq1-fec-enet",
1154                 .data = (void *)&fs_fec_ops,
1155         },
1156 #endif
1157 #endif
1158         {}
1159 };
1160 MODULE_DEVICE_TABLE(of, fs_enet_match);
1161
1162 static struct platform_driver fs_enet_driver = {
1163         .driver = {
1164                 .owner = THIS_MODULE,
1165                 .name = "fs_enet",
1166                 .of_match_table = fs_enet_match,
1167         },
1168         .probe = fs_enet_probe,
1169         .remove = fs_enet_remove,
1170 };
1171
1172 static int __init fs_init(void)
1173 {
1174         return platform_driver_register(&fs_enet_driver);
1175 }
1176
1177 static void __exit fs_cleanup(void)
1178 {
1179         platform_driver_unregister(&fs_enet_driver);
1180 }
1181
1182 #ifdef CONFIG_NET_POLL_CONTROLLER
1183 static void fs_enet_netpoll(struct net_device *dev)
1184 {
1185        disable_irq(dev->irq);
1186        fs_enet_interrupt(dev->irq, dev);
1187        enable_irq(dev->irq);
1188 }
1189 #endif
1190
1191 /**************************************************************************************/
1192
1193 module_init(fs_init);
1194 module_exit(fs_cleanup);