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         skb_tx_timestamp(skb);
 701
 702         (*fep->ops->tx_kickstart)(dev);
 703
 704         spin_unlock_irqrestore(&fep->tx_lock, flags);
 705
 706         return NETDEV_TX_OK;
 707 }
 708
 709 static void fs_timeout(struct net_device *dev)
 710 {
 711         struct fs_enet_private *fep = netdev_priv(dev);
 712         unsigned long flags;
 713         int wake = 0;
 714
 715         fep->stats.tx_errors++;
 716
 717         spin_lock_irqsave(&fep->lock, flags);
 718
 719         if (dev->flags & IFF_UP) {
 720                 phy_stop(fep->phydev);
 721                 (*fep->ops->stop)(dev);
 722                 (*fep->ops->restart)(dev);
 723                 phy_start(fep->phydev);
 724         }
 725
 726         phy_start(fep->phydev);
 727         wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 728         spin_unlock_irqrestore(&fep->lock, flags);
 729
 730         if (wake)
 731                 netif_wake_queue(dev);
 732 }
 733
 734 /*-----------------------------------------------------------------------------
 735  *  generic link-change handler - should be sufficient for most cases
 736  *-----------------------------------------------------------------------------*/
 737 static void generic_adjust_link(struct  net_device *dev)
 738 {
 739         struct fs_enet_private *fep = netdev_priv(dev);
 740         struct phy_device *phydev = fep->phydev;
 741         int new_state = 0;
 742
 743         if (phydev->link) {
 744                 /* adjust to duplex mode */
 745                 if (phydev->duplex != fep->oldduplex) {
 746                         new_state = 1;
 747                         fep->oldduplex = phydev->duplex;
 748                 }
 749
 750                 if (phydev->speed != fep->oldspeed) {
 751                         new_state = 1;
 752                         fep->oldspeed = phydev->speed;
 753                 }
 754
 755                 if (!fep->oldlink) {
 756                         new_state = 1;
 757                         fep->oldlink = 1;
 758                 }
 759
 760                 if (new_state)
 761                         fep->ops->restart(dev);
 762         } else if (fep->oldlink) {
 763                 new_state = 1;
 764                 fep->oldlink = 0;
 765                 fep->oldspeed = 0;
 766                 fep->oldduplex = -1;
 767         }
 768
 769         if (new_state && netif_msg_link(fep))
 770                 phy_print_status(phydev);
 771 }
 772
 773
 774 static void fs_adjust_link(struct net_device *dev)
 775 {
 776         struct fs_enet_private *fep = netdev_priv(dev);
 777         unsigned long flags;
 778
 779         spin_lock_irqsave(&fep->lock, flags);
 780
 781         if(fep->ops->adjust_link)
 782                 fep->ops->adjust_link(dev);
 783         else
 784                 generic_adjust_link(dev);
 785
 786         spin_unlock_irqrestore(&fep->lock, flags);
 787 }
 788
 789 static int fs_init_phy(struct net_device *dev)
 790 {
 791         struct fs_enet_private *fep = netdev_priv(dev);
 792         struct phy_device *phydev;
 793
 794         fep->oldlink = 0;
 795         fep->oldspeed = 0;
 796         fep->oldduplex = -1;
 797
 798         phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
 799                                 PHY_INTERFACE_MODE_MII);
 800         if (!phydev) {
 801                 phydev = of_phy_connect_fixed_link(dev, &fs_adjust_link,
 802                                                    PHY_INTERFACE_MODE_MII);
 803         }
 804         if (!phydev) {
 805                 dev_err(&dev->dev, "Could not attach to PHY\n");
 806                 return -ENODEV;
 807         }
 808
 809         fep->phydev = phydev;
 810
 811         return 0;
 812 }
 813
 814 static int fs_enet_open(struct net_device *dev)
 815 {
 816         struct fs_enet_private *fep = netdev_priv(dev);
 817         int r;
 818         int err;
 819
 820         /* to initialize the fep->cur_rx,... */
 821         /* not doing this, will cause a crash in fs_enet_rx_napi */
 822         fs_init_bds(fep->ndev);
 823
 824         if (fep->fpi->use_napi)
 825                 napi_enable(&fep->napi);
 826
 827         /* Install our interrupt handler. */
 828         r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
 829                         "fs_enet-mac", dev);
 830         if (r != 0) {
 831                 dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
 832                 if (fep->fpi->use_napi)
 833                         napi_disable(&fep->napi);
 834                 return -EINVAL;
 835         }
 836
 837         err = fs_init_phy(dev);
 838         if (err) {
 839                 free_irq(fep->interrupt, dev);
 840                 if (fep->fpi->use_napi)
 841                         napi_disable(&fep->napi);
 842                 return err;
 843         }
 844         phy_start(fep->phydev);
 845
 846         netif_start_queue(dev);
 847
 848         return 0;
 849 }
 850
 851 static int fs_enet_close(struct net_device *dev)
 852 {
 853         struct fs_enet_private *fep = netdev_priv(dev);
 854         unsigned long flags;
 855
 856         netif_stop_queue(dev);
 857         netif_carrier_off(dev);
 858         if (fep->fpi->use_napi)
 859                 napi_disable(&fep->napi);
 860         phy_stop(fep->phydev);
 861
 862         spin_lock_irqsave(&fep->lock, flags);
 863         spin_lock(&fep->tx_lock);
 864         (*fep->ops->stop)(dev);
 865         spin_unlock(&fep->tx_lock);
 866         spin_unlock_irqrestore(&fep->lock, flags);
 867
 868         /* release any irqs */
 869         phy_disconnect(fep->phydev);
 870         fep->phydev = NULL;
 871         free_irq(fep->interrupt, dev);
 872
 873         return 0;
 874 }
 875
 876 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 877 {
 878         struct fs_enet_private *fep = netdev_priv(dev);
 879         return &fep->stats;
 880 }
 881
 882 /*************************************************************************/
 883
 884 static void fs_get_drvinfo(struct net_device *dev,
 885                             struct ethtool_drvinfo *info)
 886 {
 887         strcpy(info->driver, DRV_MODULE_NAME);
 888         strcpy(info->version, DRV_MODULE_VERSION);
 889 }
 890
 891 static int fs_get_regs_len(struct net_device *dev)
 892 {
 893         struct fs_enet_private *fep = netdev_priv(dev);
 894
 895         return (*fep->ops->get_regs_len)(dev);
 896 }
 897
 898 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 899                          void *p)
 900 {
 901         struct fs_enet_private *fep = netdev_priv(dev);
 902         unsigned long flags;
 903         int r, len;
 904
 905         len = regs->len;
 906
 907         spin_lock_irqsave(&fep->lock, flags);
 908         r = (*fep->ops->get_regs)(dev, p, &len);
 909         spin_unlock_irqrestore(&fep->lock, flags);
 910
 911         if (r == 0)
 912                 regs->version = 0;
 913 }
 914
 915 static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 916 {
 917         struct fs_enet_private *fep = netdev_priv(dev);
 918
 919         if (!fep->phydev)
 920                 return -ENODEV;
 921
 922         return phy_ethtool_gset(fep->phydev, cmd);
 923 }
 924
 925 static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 926 {
 927         struct fs_enet_private *fep = netdev_priv(dev);
 928
 929         if (!fep->phydev)
 930                 return -ENODEV;
 931
 932         return phy_ethtool_sset(fep->phydev, cmd);
 933 }
 934
 935 static int fs_nway_reset(struct net_device *dev)
 936 {
 937         return 0;
 938 }
 939
 940 static u32 fs_get_msglevel(struct net_device *dev)
 941 {
 942         struct fs_enet_private *fep = netdev_priv(dev);
 943         return fep->msg_enable;
 944 }
 945
 946 static void fs_set_msglevel(struct net_device *dev, u32 value)
 947 {
 948         struct fs_enet_private *fep = netdev_priv(dev);
 949         fep->msg_enable = value;
 950 }
 951
 952 static const struct ethtool_ops fs_ethtool_ops = {
 953         .get_drvinfo = fs_get_drvinfo,
 954         .get_regs_len = fs_get_regs_len,
 955         .get_settings = fs_get_settings,
 956         .set_settings = fs_set_settings,
 957         .nway_reset = fs_nway_reset,
 958         .get_link = ethtool_op_get_link,
 959         .get_msglevel = fs_get_msglevel,
 960         .set_msglevel = fs_set_msglevel,
 961         .get_regs = fs_get_regs,
 962 };
 963
 964 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 965 {
 966         struct fs_enet_private *fep = netdev_priv(dev);
 967
 968         if (!netif_running(dev))
 969                 return -EINVAL;
 970
 971         return phy_mii_ioctl(fep->phydev, rq, cmd);
 972 }
 973
 974 extern int fs_mii_connect(struct net_device *dev);
 975 extern void fs_mii_disconnect(struct net_device *dev);
 976
 977 /**************************************************************************************/
 978
 979 #ifdef CONFIG_FS_ENET_HAS_FEC
 980 #define IS_FEC(match) ((match)->data == &fs_fec_ops)
 981 #else
 982 #define IS_FEC(match) 0
 983 #endif
 984
 985 static const struct net_device_ops fs_enet_netdev_ops = {
 986         .ndo_open               = fs_enet_open,
 987         .ndo_stop               = fs_enet_close,
 988         .ndo_get_stats          = fs_enet_get_stats,
 989         .ndo_start_xmit         = fs_enet_start_xmit,
 990         .ndo_tx_timeout         = fs_timeout,
 991         .ndo_set_multicast_list = fs_set_multicast_list,
 992         .ndo_do_ioctl           = fs_ioctl,
 993         .ndo_validate_addr      = eth_validate_addr,
 994         .ndo_set_mac_address    = eth_mac_addr,
 995         .ndo_change_mtu         = eth_change_mtu,
 996 #ifdef CONFIG_NET_POLL_CONTROLLER
 997         .ndo_poll_controller    = fs_enet_netpoll,
 998 #endif
 999 };
1000
1001 static struct of_device_id fs_enet_match[];
1002 static int __devinit fs_enet_probe(struct platform_device *ofdev)
1003 {
1004         const struct of_device_id *match;
1005         struct net_device *ndev;
1006         struct fs_enet_private *fep;
1007         struct fs_platform_info *fpi;
1008         const u32 *data;
1009         const u8 *mac_addr;
1010         int privsize, len, ret = -ENODEV;
1011
1012         match = of_match_device(fs_enet_match, &ofdev->dev);
1013         if (!match)
1014                 return -EINVAL;
1015
1016         fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
1017         if (!fpi)
1018                 return -ENOMEM;
1019
1020         if (!IS_FEC(match)) {
1021                 data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
1022                 if (!data || len != 4)
1023                         goto out_free_fpi;
1024
1025                 fpi->cp_command = *data;
1026         }
1027
1028         fpi->rx_ring = 32;
1029         fpi->tx_ring = 32;
1030         fpi->rx_copybreak = 240;
1031         fpi->use_napi = 1;
1032         fpi->napi_weight = 17;
1033         fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
1034         if ((!fpi->phy_node) && (!of_get_property(ofdev->dev.of_node, "fixed-link",
1035                                                   NULL)))
1036                 goto out_free_fpi;
1037
1038         privsize = sizeof(*fep) +
1039                    sizeof(struct sk_buff **) *
1040                    (fpi->rx_ring + fpi->tx_ring);
1041
1042         ndev = alloc_etherdev(privsize);
1043         if (!ndev) {
1044                 ret = -ENOMEM;
1045                 goto out_put;
1046         }
1047
1048         SET_NETDEV_DEV(ndev, &ofdev->dev);
1049         dev_set_drvdata(&ofdev->dev, ndev);
1050
1051         fep = netdev_priv(ndev);
1052         fep->dev = &ofdev->dev;
1053         fep->ndev = ndev;
1054         fep->fpi = fpi;
1055         fep->ops = match->data;
1056
1057         ret = fep->ops->setup_data(ndev);
1058         if (ret)
1059                 goto out_free_dev;
1060
1061         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1062         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1063
1064         spin_lock_init(&fep->lock);
1065         spin_lock_init(&fep->tx_lock);
1066
1067         mac_addr = of_get_mac_address(ofdev->dev.of_node);
1068         if (mac_addr)
1069                 memcpy(ndev->dev_addr, mac_addr, 6);
1070
1071         ret = fep->ops->allocate_bd(ndev);
1072         if (ret)
1073                 goto out_cleanup_data;
1074
1075         fep->rx_bd_base = fep->ring_base;
1076         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1077
1078         fep->tx_ring = fpi->tx_ring;
1079         fep->rx_ring = fpi->rx_ring;
1080
1081         ndev->netdev_ops = &fs_enet_netdev_ops;
1082         ndev->watchdog_timeo = 2 * HZ;
1083         if (fpi->use_napi)
1084                 netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi,
1085                                fpi->napi_weight);
1086
1087         ndev->ethtool_ops = &fs_ethtool_ops;
1088
1089         init_timer(&fep->phy_timer_list);
1090
1091         netif_carrier_off(ndev);
1092
1093         ret = register_netdev(ndev);
1094         if (ret)
1095                 goto out_free_bd;
1096
1097         pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
1098
1099         return 0;
1100
1101 out_free_bd:
1102         fep->ops->free_bd(ndev);
1103 out_cleanup_data:
1104         fep->ops->cleanup_data(ndev);
1105 out_free_dev:
1106         free_netdev(ndev);
1107         dev_set_drvdata(&ofdev->dev, NULL);
1108 out_put:
1109         of_node_put(fpi->phy_node);
1110 out_free_fpi:
1111         kfree(fpi);
1112         return ret;
1113 }
1114
1115 static int fs_enet_remove(struct platform_device *ofdev)
1116 {
1117         struct net_device *ndev = dev_get_drvdata(&ofdev->dev);
1118         struct fs_enet_private *fep = netdev_priv(ndev);
1119
1120         unregister_netdev(ndev);
1121
1122         fep->ops->free_bd(ndev);
1123         fep->ops->cleanup_data(ndev);
1124         dev_set_drvdata(fep->dev, NULL);
1125         of_node_put(fep->fpi->phy_node);
1126         free_netdev(ndev);
1127         return 0;
1128 }
1129
1130 static struct of_device_id fs_enet_match[] = {
1131 #ifdef CONFIG_FS_ENET_HAS_SCC
1132         {
1133                 .compatible = "fsl,cpm1-scc-enet",
1134                 .data = (void *)&fs_scc_ops,
1135         },
1136         {
1137                 .compatible = "fsl,cpm2-scc-enet",
1138                 .data = (void *)&fs_scc_ops,
1139         },
1140 #endif
1141 #ifdef CONFIG_FS_ENET_HAS_FCC
1142         {
1143                 .compatible = "fsl,cpm2-fcc-enet",
1144                 .data = (void *)&fs_fcc_ops,
1145         },
1146 #endif
1147 #ifdef CONFIG_FS_ENET_HAS_FEC
1148 #ifdef CONFIG_FS_ENET_MPC5121_FEC
1149         {
1150                 .compatible = "fsl,mpc5121-fec",
1151                 .data = (void *)&fs_fec_ops,
1152         },
1153 #else
1154         {
1155                 .compatible = "fsl,pq1-fec-enet",
1156                 .data = (void *)&fs_fec_ops,
1157         },
1158 #endif
1159 #endif
1160         {}
1161 };
1162 MODULE_DEVICE_TABLE(of, fs_enet_match);
1163
1164 static struct platform_driver fs_enet_driver = {
1165         .driver = {
1166                 .owner = THIS_MODULE,
1167                 .name = "fs_enet",
1168                 .of_match_table = fs_enet_match,
1169         },
1170         .probe = fs_enet_probe,
1171         .remove = fs_enet_remove,
1172 };
1173
1174 static int __init fs_init(void)
1175 {
1176         return platform_driver_register(&fs_enet_driver);
1177 }
1178
1179 static void __exit fs_cleanup(void)
1180 {
1181         platform_driver_unregister(&fs_enet_driver);
1182 }
1183
1184 #ifdef CONFIG_NET_POLL_CONTROLLER
1185 static void fs_enet_netpoll(struct net_device *dev)
1186 {
1187        disable_irq(dev->irq);
1188        fs_enet_interrupt(dev->irq, dev);
1189        enable_irq(dev->irq);
1190 }
1191 #endif
1192
1193 /**************************************************************************************/
1194
1195 module_init(fs_init);
1196 module_exit(fs_cleanup);