drivers/net/ethernet/freescale/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/delay.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/mii.h>
  33 #include <linux/ethtool.h>
  34 #include <linux/bitops.h>
  35 #include <linux/fs.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/phy.h>
  38 #include <linux/of.h>
  39 #include <linux/of_mdio.h>
  40 #include <linux/of_platform.h>
  41 #include <linux/of_gpio.h>
  42 #include <linux/of_net.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 #define RX_RING_SIZE    32
  64 #define TX_RING_SIZE    64
  65
  66 #ifdef CONFIG_NET_POLL_CONTROLLER
  67 static void fs_enet_netpoll(struct net_device *dev);
  68 #endif
  69
  70 static void fs_set_multicast_list(struct net_device *dev)
  71 {
  72         struct fs_enet_private *fep = netdev_priv(dev);
  73
  74         (*fep->ops->set_multicast_list)(dev);
  75 }
  76
  77 static void skb_align(struct sk_buff *skb, int align)
  78 {
  79         int off = ((unsigned long)skb->data) & (align - 1);
  80
  81         if (off)
  82                 skb_reserve(skb, align - off);
  83 }
  84
  85 /* NAPI function */
  86 static int fs_enet_napi(struct napi_struct *napi, int budget)
  87 {
  88         struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
  89         struct net_device *dev = fep->ndev;
  90         const struct fs_platform_info *fpi = fep->fpi;
  91         cbd_t __iomem *bdp;
  92         struct sk_buff *skb, *skbn;
  93         int received = 0;
  94         u16 pkt_len, sc;
  95         int curidx;
  96         int dirtyidx, do_wake, do_restart;
  97         int tx_left = TX_RING_SIZE;
  98
  99         spin_lock(&fep->tx_lock);
 100         bdp = fep->dirty_tx;
 101
 102         /* clear status bits for napi*/
 103         (*fep->ops->napi_clear_event)(dev);
 104
 105         do_wake = do_restart = 0;
 106         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0 && tx_left) {
 107                 dirtyidx = bdp - fep->tx_bd_base;
 108
 109                 if (fep->tx_free == fep->tx_ring)
 110                         break;
 111
 112                 skb = fep->tx_skbuff[dirtyidx];
 113
 114                 /*
 115                  * Check for errors.
 116                  */
 117                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 118                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 119
 120                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 121                                 fep->stats.tx_heartbeat_errors++;
 122                         if (sc & BD_ENET_TX_LC) /* Late collision */
 123                                 fep->stats.tx_window_errors++;
 124                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 125                                 fep->stats.tx_aborted_errors++;
 126                         if (sc & BD_ENET_TX_UN) /* Underrun */
 127                                 fep->stats.tx_fifo_errors++;
 128                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 129                                 fep->stats.tx_carrier_errors++;
 130
 131                         if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
 132                                 fep->stats.tx_errors++;
 133                                 do_restart = 1;
 134                         }
 135                 } else
 136                         fep->stats.tx_packets++;
 137
 138                 if (sc & BD_ENET_TX_READY) {
 139                         dev_warn(fep->dev,
 140                                  "HEY! Enet xmit interrupt and TX_READY.\n");
 141                 }
 142
 143                 /*
 144                  * Deferred means some collisions occurred during transmit,
 145                  * but we eventually sent the packet OK.
 146                  */
 147                 if (sc & BD_ENET_TX_DEF)
 148                         fep->stats.collisions++;
 149
 150                 /* unmap */
 151                 if (fep->mapped_as_page[dirtyidx])
 152                         dma_unmap_page(fep->dev, CBDR_BUFADDR(bdp),
 153                                        CBDR_DATLEN(bdp), DMA_TO_DEVICE);
 154                 else
 155                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 156                                          CBDR_DATLEN(bdp), DMA_TO_DEVICE);
 157
 158                 /*
 159                  * Free the sk buffer associated with this last transmit.
 160                  */
 161                 if (skb) {
 162                         dev_kfree_skb(skb);
 163                         fep->tx_skbuff[dirtyidx] = NULL;
 164                 }
 165
 166                 /*
 167                  * Update pointer to next buffer descriptor to be transmitted.
 168                  */
 169                 if ((sc & BD_ENET_TX_WRAP) == 0)
 170                         bdp++;
 171                 else
 172                         bdp = fep->tx_bd_base;
 173
 174                 /*
 175                  * Since we have freed up a buffer, the ring is no longer
 176                  * full.
 177                  */
 178                 if (++fep->tx_free == MAX_SKB_FRAGS)
 179                         do_wake = 1;
 180                 tx_left--;
 181         }
 182
 183         fep->dirty_tx = bdp;
 184
 185         if (do_restart)
 186                 (*fep->ops->tx_restart)(dev);
 187
 188         spin_unlock(&fep->tx_lock);
 189
 190         if (do_wake)
 191                 netif_wake_queue(dev);
 192
 193         /*
 194          * First, grab all of the stats for the incoming packet.
 195          * These get messed up if we get called due to a busy condition.
 196          */
 197         bdp = fep->cur_rx;
 198
 199         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0 &&
 200                received < budget) {
 201                 curidx = bdp - fep->rx_bd_base;
 202
 203                 /*
 204                  * Since we have allocated space to hold a complete frame,
 205                  * the last indicator should be set.
 206                  */
 207                 if ((sc & BD_ENET_RX_LAST) == 0)
 208                         dev_warn(fep->dev, "rcv is not +last\n");
 209
 210                 /*
 211                  * Check for errors.
 212                  */
 213                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 214                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 215                         fep->stats.rx_errors++;
 216                         /* Frame too long or too short. */
 217                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 218                                 fep->stats.rx_length_errors++;
 219                         /* Frame alignment */
 220                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 221                                 fep->stats.rx_frame_errors++;
 222                         /* CRC Error */
 223                         if (sc & BD_ENET_RX_CR)
 224                                 fep->stats.rx_crc_errors++;
 225                         /* FIFO overrun */
 226                         if (sc & BD_ENET_RX_OV)
 227                                 fep->stats.rx_crc_errors++;
 228
 229                         skbn = fep->rx_skbuff[curidx];
 230                 } else {
 231                         skb = fep->rx_skbuff[curidx];
 232
 233                         /*
 234                          * Process the incoming frame.
 235                          */
 236                         fep->stats.rx_packets++;
 237                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 238                         fep->stats.rx_bytes += pkt_len + 4;
 239
 240                         if (pkt_len <= fpi->rx_copybreak) {
 241                                 /* +2 to make IP header L1 cache aligned */
 242                                 skbn = netdev_alloc_skb(dev, pkt_len + 2);
 243                                 if (skbn != NULL) {
 244                                         skb_reserve(skbn, 2);   /* align IP header */
 245                                         skb_copy_from_linear_data(skb,
 246                                                       skbn->data, pkt_len);
 247                                         swap(skb, skbn);
 248                                         dma_sync_single_for_cpu(fep->dev,
 249                                                 CBDR_BUFADDR(bdp),
 250                                                 L1_CACHE_ALIGN(pkt_len),
 251                                                 DMA_FROM_DEVICE);
 252                                 }
 253                         } else {
 254                                 skbn = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
 255
 256                                 if (skbn) {
 257                                         dma_addr_t dma;
 258
 259                                         skb_align(skbn, ENET_RX_ALIGN);
 260
 261                                         dma_unmap_single(fep->dev,
 262                                                 CBDR_BUFADDR(bdp),
 263                                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 264                                                 DMA_FROM_DEVICE);
 265
 266                                         dma = dma_map_single(fep->dev,
 267                                                 skbn->data,
 268                                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 269                                                 DMA_FROM_DEVICE);
 270                                         CBDW_BUFADDR(bdp, dma);
 271                                 }
 272                         }
 273
 274                         if (skbn != NULL) {
 275                                 skb_put(skb, pkt_len);  /* Make room */
 276                                 skb->protocol = eth_type_trans(skb, dev);
 277                                 received++;
 278                                 netif_receive_skb(skb);
 279                         } else {
 280                                 fep->stats.rx_dropped++;
 281                                 skbn = skb;
 282                         }
 283                 }
 284
 285                 fep->rx_skbuff[curidx] = skbn;
 286                 CBDW_DATLEN(bdp, 0);
 287                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 288
 289                 /*
 290                  * Update BD pointer to next entry.
 291                  */
 292                 if ((sc & BD_ENET_RX_WRAP) == 0)
 293                         bdp++;
 294                 else
 295                         bdp = fep->rx_bd_base;
 296
 297                 (*fep->ops->rx_bd_done)(dev);
 298         }
 299
 300         fep->cur_rx = bdp;
 301
 302         if (received < budget && tx_left) {
 303                 /* done */
 304                 napi_complete(napi);
 305                 (*fep->ops->napi_enable)(dev);
 306
 307                 return received;
 308         }
 309
 310         return budget;
 311 }
 312
 313 /*
 314  * The interrupt handler.
 315  * This is called from the MPC core interrupt.
 316  */
 317 static irqreturn_t
 318 fs_enet_interrupt(int irq, void *dev_id)
 319 {
 320         struct net_device *dev = dev_id;
 321         struct fs_enet_private *fep;
 322         const struct fs_platform_info *fpi;
 323         u32 int_events;
 324         u32 int_clr_events;
 325         int nr, napi_ok;
 326         int handled;
 327
 328         fep = netdev_priv(dev);
 329         fpi = fep->fpi;
 330
 331         nr = 0;
 332         while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
 333                 nr++;
 334
 335                 int_clr_events = int_events;
 336                 int_clr_events &= ~fep->ev_napi;
 337
 338                 (*fep->ops->clear_int_events)(dev, int_clr_events);
 339
 340                 if (int_events & fep->ev_err)
 341                         (*fep->ops->ev_error)(dev, int_events);
 342
 343                 if (int_events & fep->ev) {
 344                         napi_ok = napi_schedule_prep(&fep->napi);
 345
 346                         (*fep->ops->napi_disable)(dev);
 347                         (*fep->ops->clear_int_events)(dev, fep->ev_napi);
 348
 349                         /* NOTE: it is possible for FCCs in NAPI mode    */
 350                         /* to submit a spurious interrupt while in poll  */
 351                         if (napi_ok)
 352                                 __napi_schedule(&fep->napi);
 353                 }
 354
 355         }
 356
 357         handled = nr > 0;
 358         return IRQ_RETVAL(handled);
 359 }
 360
 361 void fs_init_bds(struct net_device *dev)
 362 {
 363         struct fs_enet_private *fep = netdev_priv(dev);
 364         cbd_t __iomem *bdp;
 365         struct sk_buff *skb;
 366         int i;
 367
 368         fs_cleanup_bds(dev);
 369
 370         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 371         fep->tx_free = fep->tx_ring;
 372         fep->cur_rx = fep->rx_bd_base;
 373
 374         /*
 375          * Initialize the receive buffer descriptors.
 376          */
 377         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 378                 skb = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
 379                 if (skb == NULL)
 380                         break;
 381
 382                 skb_align(skb, ENET_RX_ALIGN);
 383                 fep->rx_skbuff[i] = skb;
 384                 CBDW_BUFADDR(bdp,
 385                         dma_map_single(fep->dev, skb->data,
 386                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 387                                 DMA_FROM_DEVICE));
 388                 CBDW_DATLEN(bdp, 0);    /* zero */
 389                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 390                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 391         }
 392         /*
 393          * if we failed, fillup remainder
 394          */
 395         for (; i < fep->rx_ring; i++, bdp++) {
 396                 fep->rx_skbuff[i] = NULL;
 397                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 398         }
 399
 400         /*
 401          * ...and the same for transmit.
 402          */
 403         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 404                 fep->tx_skbuff[i] = NULL;
 405                 CBDW_BUFADDR(bdp, 0);
 406                 CBDW_DATLEN(bdp, 0);
 407                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 408         }
 409 }
 410
 411 void fs_cleanup_bds(struct net_device *dev)
 412 {
 413         struct fs_enet_private *fep = netdev_priv(dev);
 414         struct sk_buff *skb;
 415         cbd_t __iomem *bdp;
 416         int i;
 417
 418         /*
 419          * Reset SKB transmit buffers.
 420          */
 421         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 422                 if ((skb = fep->tx_skbuff[i]) == NULL)
 423                         continue;
 424
 425                 /* unmap */
 426                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 427                                 skb->len, DMA_TO_DEVICE);
 428
 429                 fep->tx_skbuff[i] = NULL;
 430                 dev_kfree_skb(skb);
 431         }
 432
 433         /*
 434          * Reset SKB receive buffers
 435          */
 436         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 437                 if ((skb = fep->rx_skbuff[i]) == NULL)
 438                         continue;
 439
 440                 /* unmap */
 441                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 442                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 443                         DMA_FROM_DEVICE);
 444
 445                 fep->rx_skbuff[i] = NULL;
 446
 447                 dev_kfree_skb(skb);
 448         }
 449 }
 450
 451 /**********************************************************************************/
 452
 453 #ifdef CONFIG_FS_ENET_MPC5121_FEC
 454 /*
 455  * MPC5121 FEC requeries 4-byte alignment for TX data buffer!
 456  */
 457 static struct sk_buff *tx_skb_align_workaround(struct net_device *dev,
 458                                                struct sk_buff *skb)
 459 {
 460         struct sk_buff *new_skb;
 461
 462         if (skb_linearize(skb))
 463                 return NULL;
 464
 465         /* Alloc new skb */
 466         new_skb = netdev_alloc_skb(dev, skb->len + 4);
 467         if (!new_skb)
 468                 return NULL;
 469
 470         /* Make sure new skb is properly aligned */
 471         skb_align(new_skb, 4);
 472
 473         /* Copy data to new skb ... */
 474         skb_copy_from_linear_data(skb, new_skb->data, skb->len);
 475         skb_put(new_skb, skb->len);
 476
 477         /* ... and free an old one */
 478         dev_kfree_skb_any(skb);
 479
 480         return new_skb;
 481 }
 482 #endif
 483
 484 static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 485 {
 486         struct fs_enet_private *fep = netdev_priv(dev);
 487         cbd_t __iomem *bdp;
 488         int curidx;
 489         u16 sc;
 490         int nr_frags;
 491         skb_frag_t *frag;
 492         int len;
 493 #ifdef CONFIG_FS_ENET_MPC5121_FEC
 494         int is_aligned = 1;
 495         int i;
 496
 497         if (!IS_ALIGNED((unsigned long)skb->data, 4)) {
 498                 is_aligned = 0;
 499         } else {
 500                 nr_frags = skb_shinfo(skb)->nr_frags;
 501                 frag = skb_shinfo(skb)->frags;
 502                 for (i = 0; i < nr_frags; i++, frag++) {
 503                         if (!IS_ALIGNED(frag->page_offset, 4)) {
 504                                 is_aligned = 0;
 505                                 break;
 506                         }
 507                 }
 508         }
 509
 510         if (!is_aligned) {
 511                 skb = tx_skb_align_workaround(dev, skb);
 512                 if (!skb) {
 513                         /*
 514                          * We have lost packet due to memory allocation error
 515                          * in tx_skb_align_workaround(). Hopefully original
 516                          * skb is still valid, so try transmit it later.
 517                          */
 518                         return NETDEV_TX_BUSY;
 519                 }
 520         }
 521 #endif
 522
 523         spin_lock(&fep->tx_lock);
 524
 525         /*
 526          * Fill in a Tx ring entry
 527          */
 528         bdp = fep->cur_tx;
 529
 530         nr_frags = skb_shinfo(skb)->nr_frags;
 531         if (fep->tx_free <= nr_frags || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 532                 netif_stop_queue(dev);
 533                 spin_unlock(&fep->tx_lock);
 534
 535                 /*
 536                  * Ooops.  All transmit buffers are full.  Bail out.
 537                  * This should not happen, since the tx queue should be stopped.
 538                  */
 539                 dev_warn(fep->dev, "tx queue full!.\n");
 540                 return NETDEV_TX_BUSY;
 541         }
 542
 543         curidx = bdp - fep->tx_bd_base;
 544
 545         len = skb->len;
 546         fep->stats.tx_bytes += len;
 547         if (nr_frags)
 548                 len -= skb->data_len;
 549         fep->tx_free -= nr_frags + 1;
 550         /*
 551          * Push the data cache so the CPM does not get stale memory data.
 552          */
 553         CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
 554                                 skb->data, len, DMA_TO_DEVICE));
 555         CBDW_DATLEN(bdp, len);
 556
 557         fep->mapped_as_page[curidx] = 0;
 558         frag = skb_shinfo(skb)->frags;
 559         while (nr_frags) {
 560                 CBDC_SC(bdp,
 561                         BD_ENET_TX_STATS | BD_ENET_TX_INTR | BD_ENET_TX_LAST |
 562                         BD_ENET_TX_TC);
 563                 CBDS_SC(bdp, BD_ENET_TX_READY);
 564
 565                 if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 566                         bdp++, curidx++;
 567                 else
 568                         bdp = fep->tx_bd_base, curidx = 0;
 569
 570                 len = skb_frag_size(frag);
 571                 CBDW_BUFADDR(bdp, skb_frag_dma_map(fep->dev, frag, 0, len,
 572                                                    DMA_TO_DEVICE));
 573                 CBDW_DATLEN(bdp, len);
 574
 575                 fep->tx_skbuff[curidx] = NULL;
 576                 fep->mapped_as_page[curidx] = 1;
 577
 578                 frag++;
 579                 nr_frags--;
 580         }
 581
 582         /* Trigger transmission start */
 583         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 584              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 585
 586         /* note that while FEC does not have this bit
 587          * it marks it as available for software use
 588          * yay for hw reuse :) */
 589         if (skb->len <= 60)
 590                 sc |= BD_ENET_TX_PAD;
 591         CBDC_SC(bdp, BD_ENET_TX_STATS);
 592         CBDS_SC(bdp, sc);
 593
 594         /* Save skb pointer. */
 595         fep->tx_skbuff[curidx] = skb;
 596
 597         /* If this was the last BD in the ring, start at the beginning again. */
 598         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 599                 bdp++;
 600         else
 601                 bdp = fep->tx_bd_base;
 602         fep->cur_tx = bdp;
 603
 604         if (fep->tx_free < MAX_SKB_FRAGS)
 605                 netif_stop_queue(dev);
 606
 607         skb_tx_timestamp(skb);
 608
 609         (*fep->ops->tx_kickstart)(dev);
 610
 611         spin_unlock(&fep->tx_lock);
 612
 613         return NETDEV_TX_OK;
 614 }
 615
 616 static void fs_timeout(struct net_device *dev)
 617 {
 618         struct fs_enet_private *fep = netdev_priv(dev);
 619         unsigned long flags;
 620         int wake = 0;
 621
 622         fep->stats.tx_errors++;
 623
 624         spin_lock_irqsave(&fep->lock, flags);
 625
 626         if (dev->flags & IFF_UP) {
 627                 phy_stop(dev->phydev);
 628                 (*fep->ops->stop)(dev);
 629                 (*fep->ops->restart)(dev);
 630                 phy_start(dev->phydev);
 631         }
 632
 633         phy_start(dev->phydev);
 634         wake = fep->tx_free >= MAX_SKB_FRAGS &&
 635                !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 636         spin_unlock_irqrestore(&fep->lock, flags);
 637
 638         if (wake)
 639                 netif_wake_queue(dev);
 640 }
 641
 642 /*-----------------------------------------------------------------------------
 643  *  generic link-change handler - should be sufficient for most cases
 644  *-----------------------------------------------------------------------------*/
 645 static void generic_adjust_link(struct  net_device *dev)
 646 {
 647         struct fs_enet_private *fep = netdev_priv(dev);
 648         struct phy_device *phydev = dev->phydev;
 649         int new_state = 0;
 650
 651         if (phydev->link) {
 652                 /* adjust to duplex mode */
 653                 if (phydev->duplex != fep->oldduplex) {
 654                         new_state = 1;
 655                         fep->oldduplex = phydev->duplex;
 656                 }
 657
 658                 if (phydev->speed != fep->oldspeed) {
 659                         new_state = 1;
 660                         fep->oldspeed = phydev->speed;
 661                 }
 662
 663                 if (!fep->oldlink) {
 664                         new_state = 1;
 665                         fep->oldlink = 1;
 666                 }
 667
 668                 if (new_state)
 669                         fep->ops->restart(dev);
 670         } else if (fep->oldlink) {
 671                 new_state = 1;
 672                 fep->oldlink = 0;
 673                 fep->oldspeed = 0;
 674                 fep->oldduplex = -1;
 675         }
 676
 677         if (new_state && netif_msg_link(fep))
 678                 phy_print_status(phydev);
 679 }
 680
 681
 682 static void fs_adjust_link(struct net_device *dev)
 683 {
 684         struct fs_enet_private *fep = netdev_priv(dev);
 685         unsigned long flags;
 686
 687         spin_lock_irqsave(&fep->lock, flags);
 688
 689         if(fep->ops->adjust_link)
 690                 fep->ops->adjust_link(dev);
 691         else
 692                 generic_adjust_link(dev);
 693
 694         spin_unlock_irqrestore(&fep->lock, flags);
 695 }
 696
 697 static int fs_init_phy(struct net_device *dev)
 698 {
 699         struct fs_enet_private *fep = netdev_priv(dev);
 700         struct phy_device *phydev;
 701         phy_interface_t iface;
 702
 703         fep->oldlink = 0;
 704         fep->oldspeed = 0;
 705         fep->oldduplex = -1;
 706
 707         iface = fep->fpi->use_rmii ?
 708                 PHY_INTERFACE_MODE_RMII : PHY_INTERFACE_MODE_MII;
 709
 710         phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
 711                                 iface);
 712         if (!phydev) {
 713                 dev_err(&dev->dev, "Could not attach to PHY\n");
 714                 return -ENODEV;
 715         }
 716
 717         return 0;
 718 }
 719
 720 static int fs_enet_open(struct net_device *dev)
 721 {
 722         struct fs_enet_private *fep = netdev_priv(dev);
 723         int r;
 724         int err;
 725
 726         /* to initialize the fep->cur_rx,... */
 727         /* not doing this, will cause a crash in fs_enet_napi */
 728         fs_init_bds(fep->ndev);
 729
 730         napi_enable(&fep->napi);
 731
 732         /* Install our interrupt handler. */
 733         r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
 734                         "fs_enet-mac", dev);
 735         if (r != 0) {
 736                 dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
 737                 napi_disable(&fep->napi);
 738                 return -EINVAL;
 739         }
 740
 741         err = fs_init_phy(dev);
 742         if (err) {
 743                 free_irq(fep->interrupt, dev);
 744                 napi_disable(&fep->napi);
 745                 return err;
 746         }
 747         phy_start(dev->phydev);
 748
 749         netif_start_queue(dev);
 750
 751         return 0;
 752 }
 753
 754 static int fs_enet_close(struct net_device *dev)
 755 {
 756         struct fs_enet_private *fep = netdev_priv(dev);
 757         unsigned long flags;
 758
 759         netif_stop_queue(dev);
 760         netif_carrier_off(dev);
 761         napi_disable(&fep->napi);
 762         phy_stop(dev->phydev);
 763
 764         spin_lock_irqsave(&fep->lock, flags);
 765         spin_lock(&fep->tx_lock);
 766         (*fep->ops->stop)(dev);
 767         spin_unlock(&fep->tx_lock);
 768         spin_unlock_irqrestore(&fep->lock, flags);
 769
 770         /* release any irqs */
 771         phy_disconnect(dev->phydev);
 772         free_irq(fep->interrupt, dev);
 773
 774         return 0;
 775 }
 776
 777 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 778 {
 779         struct fs_enet_private *fep = netdev_priv(dev);
 780         return &fep->stats;
 781 }
 782
 783 /*************************************************************************/
 784
 785 static void fs_get_drvinfo(struct net_device *dev,
 786                             struct ethtool_drvinfo *info)
 787 {
 788         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
 789         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
 790 }
 791
 792 static int fs_get_regs_len(struct net_device *dev)
 793 {
 794         struct fs_enet_private *fep = netdev_priv(dev);
 795
 796         return (*fep->ops->get_regs_len)(dev);
 797 }
 798
 799 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 800                          void *p)
 801 {
 802         struct fs_enet_private *fep = netdev_priv(dev);
 803         unsigned long flags;
 804         int r, len;
 805
 806         len = regs->len;
 807
 808         spin_lock_irqsave(&fep->lock, flags);
 809         r = (*fep->ops->get_regs)(dev, p, &len);
 810         spin_unlock_irqrestore(&fep->lock, flags);
 811
 812         if (r == 0)
 813                 regs->version = 0;
 814 }
 815
 816 static int fs_nway_reset(struct net_device *dev)
 817 {
 818         return 0;
 819 }
 820
 821 static u32 fs_get_msglevel(struct net_device *dev)
 822 {
 823         struct fs_enet_private *fep = netdev_priv(dev);
 824         return fep->msg_enable;
 825 }
 826
 827 static void fs_set_msglevel(struct net_device *dev, u32 value)
 828 {
 829         struct fs_enet_private *fep = netdev_priv(dev);
 830         fep->msg_enable = value;
 831 }
 832
 833 static int fs_get_tunable(struct net_device *dev,
 834                           const struct ethtool_tunable *tuna, void *data)
 835 {
 836         struct fs_enet_private *fep = netdev_priv(dev);
 837         struct fs_platform_info *fpi = fep->fpi;
 838         int ret = 0;
 839
 840         switch (tuna->id) {
 841         case ETHTOOL_RX_COPYBREAK:
 842                 *(u32 *)data = fpi->rx_copybreak;
 843                 break;
 844         default:
 845                 ret = -EINVAL;
 846                 break;
 847         }
 848
 849         return ret;
 850 }
 851
 852 static int fs_set_tunable(struct net_device *dev,
 853                           const struct ethtool_tunable *tuna, const void *data)
 854 {
 855         struct fs_enet_private *fep = netdev_priv(dev);
 856         struct fs_platform_info *fpi = fep->fpi;
 857         int ret = 0;
 858
 859         switch (tuna->id) {
 860         case ETHTOOL_RX_COPYBREAK:
 861                 fpi->rx_copybreak = *(u32 *)data;
 862                 break;
 863         default:
 864                 ret = -EINVAL;
 865                 break;
 866         }
 867
 868         return ret;
 869 }
 870
 871 static const struct ethtool_ops fs_ethtool_ops = {
 872         .get_drvinfo = fs_get_drvinfo,
 873         .get_regs_len = fs_get_regs_len,
 874         .nway_reset = fs_nway_reset,
 875         .get_link = ethtool_op_get_link,
 876         .get_msglevel = fs_get_msglevel,
 877         .set_msglevel = fs_set_msglevel,
 878         .get_regs = fs_get_regs,
 879         .get_ts_info = ethtool_op_get_ts_info,
 880         .get_link_ksettings = phy_ethtool_get_link_ksettings,
 881         .set_link_ksettings = phy_ethtool_set_link_ksettings,
 882         .get_tunable = fs_get_tunable,
 883         .set_tunable = fs_set_tunable,
 884 };
 885
 886 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 887 {
 888         if (!netif_running(dev))
 889                 return -EINVAL;
 890
 891         return phy_mii_ioctl(dev->phydev, rq, cmd);
 892 }
 893
 894 extern int fs_mii_connect(struct net_device *dev);
 895 extern void fs_mii_disconnect(struct net_device *dev);
 896
 897 /**************************************************************************************/
 898
 899 #ifdef CONFIG_FS_ENET_HAS_FEC
 900 #define IS_FEC(match) ((match)->data == &fs_fec_ops)
 901 #else
 902 #define IS_FEC(match) 0
 903 #endif
 904
 905 static const struct net_device_ops fs_enet_netdev_ops = {
 906         .ndo_open               = fs_enet_open,
 907         .ndo_stop               = fs_enet_close,
 908         .ndo_get_stats          = fs_enet_get_stats,
 909         .ndo_start_xmit         = fs_enet_start_xmit,
 910         .ndo_tx_timeout         = fs_timeout,
 911         .ndo_set_rx_mode        = fs_set_multicast_list,
 912         .ndo_do_ioctl           = fs_ioctl,
 913         .ndo_validate_addr      = eth_validate_addr,
 914         .ndo_set_mac_address    = eth_mac_addr,
 915         .ndo_change_mtu         = eth_change_mtu,
 916 #ifdef CONFIG_NET_POLL_CONTROLLER
 917         .ndo_poll_controller    = fs_enet_netpoll,
 918 #endif
 919 };
 920
 921 static const struct of_device_id fs_enet_match[];
 922 static int fs_enet_probe(struct platform_device *ofdev)
 923 {
 924         const struct of_device_id *match;
 925         struct net_device *ndev;
 926         struct fs_enet_private *fep;
 927         struct fs_platform_info *fpi;
 928         const u32 *data;
 929         struct clk *clk;
 930         int err;
 931         const u8 *mac_addr;
 932         const char *phy_connection_type;
 933         int privsize, len, ret = -ENODEV;
 934
 935         match = of_match_device(fs_enet_match, &ofdev->dev);
 936         if (!match)
 937                 return -EINVAL;
 938
 939         fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
 940         if (!fpi)
 941                 return -ENOMEM;
 942
 943         if (!IS_FEC(match)) {
 944                 data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
 945                 if (!data || len != 4)
 946                         goto out_free_fpi;
 947
 948                 fpi->cp_command = *data;
 949         }
 950
 951         fpi->rx_ring = RX_RING_SIZE;
 952         fpi->tx_ring = TX_RING_SIZE;
 953         fpi->rx_copybreak = 240;
 954         fpi->napi_weight = 17;
 955         fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
 956         if (!fpi->phy_node && of_phy_is_fixed_link(ofdev->dev.of_node)) {
 957                 err = of_phy_register_fixed_link(ofdev->dev.of_node);
 958                 if (err)
 959                         goto out_free_fpi;
 960
 961                 /* In the case of a fixed PHY, the DT node associated
 962                  * to the PHY is the Ethernet MAC DT node.
 963                  */
 964                 fpi->phy_node = of_node_get(ofdev->dev.of_node);
 965         }
 966
 967         if (of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc5125-fec")) {
 968                 phy_connection_type = of_get_property(ofdev->dev.of_node,
 969                                                 "phy-connection-type", NULL);
 970                 if (phy_connection_type && !strcmp("rmii", phy_connection_type))
 971                         fpi->use_rmii = 1;
 972         }
 973
 974         /* make clock lookup non-fatal (the driver is shared among platforms),
 975          * but require enable to succeed when a clock was specified/found,
 976          * keep a reference to the clock upon successful acquisition
 977          */
 978         clk = devm_clk_get(&ofdev->dev, "per");
 979         if (!IS_ERR(clk)) {
 980                 err = clk_prepare_enable(clk);
 981                 if (err) {
 982                         ret = err;
 983                         goto out_free_fpi;
 984                 }
 985                 fpi->clk_per = clk;
 986         }
 987
 988         privsize = sizeof(*fep) +
 989                    sizeof(struct sk_buff **) *
 990                      (fpi->rx_ring + fpi->tx_ring) +
 991                    sizeof(char) * fpi->tx_ring;
 992
 993         ndev = alloc_etherdev(privsize);
 994         if (!ndev) {
 995                 ret = -ENOMEM;
 996                 goto out_put;
 997         }
 998
 999         SET_NETDEV_DEV(ndev, &ofdev->dev);
1000         platform_set_drvdata(ofdev, ndev);
1001
1002         fep = netdev_priv(ndev);
1003         fep->dev = &ofdev->dev;
1004         fep->ndev = ndev;
1005         fep->fpi = fpi;
1006         fep->ops = match->data;
1007
1008         ret = fep->ops->setup_data(ndev);
1009         if (ret)
1010                 goto out_free_dev;
1011
1012         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1013         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1014         fep->mapped_as_page = (char *)(fep->rx_skbuff + fpi->rx_ring +
1015                                        fpi->tx_ring);
1016
1017         spin_lock_init(&fep->lock);
1018         spin_lock_init(&fep->tx_lock);
1019
1020         mac_addr = of_get_mac_address(ofdev->dev.of_node);
1021         if (mac_addr)
1022                 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
1023
1024         ret = fep->ops->allocate_bd(ndev);
1025         if (ret)
1026                 goto out_cleanup_data;
1027
1028         fep->rx_bd_base = fep->ring_base;
1029         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1030
1031         fep->tx_ring = fpi->tx_ring;
1032         fep->rx_ring = fpi->rx_ring;
1033
1034         ndev->netdev_ops = &fs_enet_netdev_ops;
1035         ndev->watchdog_timeo = 2 * HZ;
1036         netif_napi_add(ndev, &fep->napi, fs_enet_napi, fpi->napi_weight);
1037
1038         ndev->ethtool_ops = &fs_ethtool_ops;
1039
1040         init_timer(&fep->phy_timer_list);
1041
1042         netif_carrier_off(ndev);
1043
1044         ndev->features |= NETIF_F_SG;
1045
1046         ret = register_netdev(ndev);
1047         if (ret)
1048                 goto out_free_bd;
1049
1050         pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
1051
1052         return 0;
1053
1054 out_free_bd:
1055         fep->ops->free_bd(ndev);
1056 out_cleanup_data:
1057         fep->ops->cleanup_data(ndev);
1058 out_free_dev:
1059         free_netdev(ndev);
1060 out_put:
1061         of_node_put(fpi->phy_node);
1062         if (fpi->clk_per)
1063                 clk_disable_unprepare(fpi->clk_per);
1064 out_free_fpi:
1065         kfree(fpi);
1066         return ret;
1067 }
1068
1069 static int fs_enet_remove(struct platform_device *ofdev)
1070 {
1071         struct net_device *ndev = platform_get_drvdata(ofdev);
1072         struct fs_enet_private *fep = netdev_priv(ndev);
1073
1074         unregister_netdev(ndev);
1075
1076         fep->ops->free_bd(ndev);
1077         fep->ops->cleanup_data(ndev);
1078         dev_set_drvdata(fep->dev, NULL);
1079         of_node_put(fep->fpi->phy_node);
1080         if (fep->fpi->clk_per)
1081                 clk_disable_unprepare(fep->fpi->clk_per);
1082         free_netdev(ndev);
1083         return 0;
1084 }
1085
1086 static const struct of_device_id fs_enet_match[] = {
1087 #ifdef CONFIG_FS_ENET_HAS_SCC
1088         {
1089                 .compatible = "fsl,cpm1-scc-enet",
1090                 .data = (void *)&fs_scc_ops,
1091         },
1092         {
1093                 .compatible = "fsl,cpm2-scc-enet",
1094                 .data = (void *)&fs_scc_ops,
1095         },
1096 #endif
1097 #ifdef CONFIG_FS_ENET_HAS_FCC
1098         {
1099                 .compatible = "fsl,cpm2-fcc-enet",
1100                 .data = (void *)&fs_fcc_ops,
1101         },
1102 #endif
1103 #ifdef CONFIG_FS_ENET_HAS_FEC
1104 #ifdef CONFIG_FS_ENET_MPC5121_FEC
1105         {
1106                 .compatible = "fsl,mpc5121-fec",
1107                 .data = (void *)&fs_fec_ops,
1108         },
1109         {
1110                 .compatible = "fsl,mpc5125-fec",
1111                 .data = (void *)&fs_fec_ops,
1112         },
1113 #else
1114         {
1115                 .compatible = "fsl,pq1-fec-enet",
1116                 .data = (void *)&fs_fec_ops,
1117         },
1118 #endif
1119 #endif
1120         {}
1121 };
1122 MODULE_DEVICE_TABLE(of, fs_enet_match);
1123
1124 static struct platform_driver fs_enet_driver = {
1125         .driver = {
1126                 .name = "fs_enet",
1127                 .of_match_table = fs_enet_match,
1128         },
1129         .probe = fs_enet_probe,
1130         .remove = fs_enet_remove,
1131 };
1132
1133 #ifdef CONFIG_NET_POLL_CONTROLLER
1134 static void fs_enet_netpoll(struct net_device *dev)
1135 {
1136        disable_irq(dev->irq);
1137        fs_enet_interrupt(dev->irq, dev);
1138        enable_irq(dev->irq);
1139 }
1140 #endif
1141
1142 module_platform_driver(fs_enet_driver);