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 #include <linux/pgtable.h>
  44
  45 #include <linux/vmalloc.h>
  46 #include <asm/irq.h>
  47 #include <linux/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
  57 static int fs_enet_debug = -1; /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
  58 module_param(fs_enet_debug, int, 0);
  59 MODULE_PARM_DESC(fs_enet_debug,
  60                  "Freescale bitmapped debugging message enable value");
  61
  62 #define RX_RING_SIZE    32
  63 #define TX_RING_SIZE    64
  64
  65 #ifdef CONFIG_NET_POLL_CONTROLLER
  66 static void fs_enet_netpoll(struct net_device *dev);
  67 #endif
  68
  69 static void fs_set_multicast_list(struct net_device *dev)
  70 {
  71         struct fs_enet_private *fep = netdev_priv(dev);
  72
  73         (*fep->ops->set_multicast_list)(dev);
  74 }
  75
  76 static void skb_align(struct sk_buff *skb, int align)
  77 {
  78         int off = ((unsigned long)skb->data) & (align - 1);
  79
  80         if (off)
  81                 skb_reserve(skb, align - off);
  82 }
  83
  84 /* NAPI function */
  85 static int fs_enet_napi(struct napi_struct *napi, int budget)
  86 {
  87         struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
  88         struct net_device *dev = fep->ndev;
  89         const struct fs_platform_info *fpi = fep->fpi;
  90         cbd_t __iomem *bdp;
  91         struct sk_buff *skb, *skbn;
  92         int received = 0;
  93         u16 pkt_len, sc;
  94         int curidx;
  95         int dirtyidx, do_wake, do_restart;
  96         int tx_left = TX_RING_SIZE;
  97
  98         spin_lock(&fep->tx_lock);
  99         bdp = fep->dirty_tx;
 100
 101         /* clear status bits for napi*/
 102         (*fep->ops->napi_clear_event)(dev);
 103
 104         do_wake = do_restart = 0;
 105         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0 && tx_left) {
 106                 dirtyidx = bdp - fep->tx_bd_base;
 107
 108                 if (fep->tx_free == fep->tx_ring)
 109                         break;
 110
 111                 skb = fep->tx_skbuff[dirtyidx];
 112
 113                 /*
 114                  * Check for errors.
 115                  */
 116                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 117                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 118
 119                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 120                                 dev->stats.tx_heartbeat_errors++;
 121                         if (sc & BD_ENET_TX_LC) /* Late collision */
 122                                 dev->stats.tx_window_errors++;
 123                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 124                                 dev->stats.tx_aborted_errors++;
 125                         if (sc & BD_ENET_TX_UN) /* Underrun */
 126                                 dev->stats.tx_fifo_errors++;
 127                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 128                                 dev->stats.tx_carrier_errors++;
 129
 130                         if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
 131                                 dev->stats.tx_errors++;
 132                                 do_restart = 1;
 133                         }
 134                 } else
 135                         dev->stats.tx_packets++;
 136
 137                 if (sc & BD_ENET_TX_READY) {
 138                         dev_warn(fep->dev,
 139                                  "HEY! Enet xmit interrupt and TX_READY.\n");
 140                 }
 141
 142                 /*
 143                  * Deferred means some collisions occurred during transmit,
 144                  * but we eventually sent the packet OK.
 145                  */
 146                 if (sc & BD_ENET_TX_DEF)
 147                         dev->stats.collisions++;
 148
 149                 /* unmap */
 150                 if (fep->mapped_as_page[dirtyidx])
 151                         dma_unmap_page(fep->dev, CBDR_BUFADDR(bdp),
 152                                        CBDR_DATLEN(bdp), DMA_TO_DEVICE);
 153                 else
 154                         dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 155                                          CBDR_DATLEN(bdp), DMA_TO_DEVICE);
 156
 157                 /*
 158                  * Free the sk buffer associated with this last transmit.
 159                  */
 160                 if (skb) {
 161                         dev_kfree_skb(skb);
 162                         fep->tx_skbuff[dirtyidx] = NULL;
 163                 }
 164
 165                 /*
 166                  * Update pointer to next buffer descriptor to be transmitted.
 167                  */
 168                 if ((sc & BD_ENET_TX_WRAP) == 0)
 169                         bdp++;
 170                 else
 171                         bdp = fep->tx_bd_base;
 172
 173                 /*
 174                  * Since we have freed up a buffer, the ring is no longer
 175                  * full.
 176                  */
 177                 if (++fep->tx_free == MAX_SKB_FRAGS)
 178                         do_wake = 1;
 179                 tx_left--;
 180         }
 181
 182         fep->dirty_tx = bdp;
 183
 184         if (do_restart)
 185                 (*fep->ops->tx_restart)(dev);
 186
 187         spin_unlock(&fep->tx_lock);
 188
 189         if (do_wake)
 190                 netif_wake_queue(dev);
 191
 192         /*
 193          * First, grab all of the stats for the incoming packet.
 194          * These get messed up if we get called due to a busy condition.
 195          */
 196         bdp = fep->cur_rx;
 197
 198         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0 &&
 199                received < budget) {
 200                 curidx = bdp - fep->rx_bd_base;
 201
 202                 /*
 203                  * Since we have allocated space to hold a complete frame,
 204                  * the last indicator should be set.
 205                  */
 206                 if ((sc & BD_ENET_RX_LAST) == 0)
 207                         dev_warn(fep->dev, "rcv is not +last\n");
 208
 209                 /*
 210                  * Check for errors.
 211                  */
 212                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 213                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 214                         dev->stats.rx_errors++;
 215                         /* Frame too long or too short. */
 216                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 217                                 dev->stats.rx_length_errors++;
 218                         /* Frame alignment */
 219                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 220                                 dev->stats.rx_frame_errors++;
 221                         /* CRC Error */
 222                         if (sc & BD_ENET_RX_CR)
 223                                 dev->stats.rx_crc_errors++;
 224                         /* FIFO overrun */
 225                         if (sc & BD_ENET_RX_OV)
 226                                 dev->stats.rx_crc_errors++;
 227
 228                         skbn = fep->rx_skbuff[curidx];
 229                 } else {
 230                         skb = fep->rx_skbuff[curidx];
 231
 232                         /*
 233                          * Process the incoming frame.
 234                          */
 235                         dev->stats.rx_packets++;
 236                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 237                         dev->stats.rx_bytes += pkt_len + 4;
 238
 239                         if (pkt_len <= fpi->rx_copybreak) {
 240                                 /* +2 to make IP header L1 cache aligned */
 241                                 skbn = netdev_alloc_skb(dev, pkt_len + 2);
 242                                 if (skbn != NULL) {
 243                                         skb_reserve(skbn, 2);   /* align IP header */
 244                                         skb_copy_from_linear_data(skb,
 245                                                       skbn->data, pkt_len);
 246                                         swap(skb, skbn);
 247                                         dma_sync_single_for_cpu(fep->dev,
 248                                                 CBDR_BUFADDR(bdp),
 249                                                 L1_CACHE_ALIGN(pkt_len),
 250                                                 DMA_FROM_DEVICE);
 251                                 }
 252                         } else {
 253                                 skbn = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
 254
 255                                 if (skbn) {
 256                                         dma_addr_t dma;
 257
 258                                         skb_align(skbn, ENET_RX_ALIGN);
 259
 260                                         dma_unmap_single(fep->dev,
 261                                                 CBDR_BUFADDR(bdp),
 262                                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 263                                                 DMA_FROM_DEVICE);
 264
 265                                         dma = dma_map_single(fep->dev,
 266                                                 skbn->data,
 267                                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 268                                                 DMA_FROM_DEVICE);
 269                                         CBDW_BUFADDR(bdp, dma);
 270                                 }
 271                         }
 272
 273                         if (skbn != NULL) {
 274                                 skb_put(skb, pkt_len);  /* Make room */
 275                                 skb->protocol = eth_type_trans(skb, dev);
 276                                 received++;
 277                                 netif_receive_skb(skb);
 278                         } else {
 279                                 dev->stats.rx_dropped++;
 280                                 skbn = skb;
 281                         }
 282                 }
 283
 284                 fep->rx_skbuff[curidx] = skbn;
 285                 CBDW_DATLEN(bdp, 0);
 286                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 287
 288                 /*
 289                  * Update BD pointer to next entry.
 290                  */
 291                 if ((sc & BD_ENET_RX_WRAP) == 0)
 292                         bdp++;
 293                 else
 294                         bdp = fep->rx_bd_base;
 295
 296                 (*fep->ops->rx_bd_done)(dev);
 297         }
 298
 299         fep->cur_rx = bdp;
 300
 301         if (received < budget && tx_left) {
 302                 /* done */
 303                 napi_complete_done(napi, received);
 304                 (*fep->ops->napi_enable)(dev);
 305
 306                 return received;
 307         }
 308
 309         return budget;
 310 }
 311
 312 /*
 313  * The interrupt handler.
 314  * This is called from the MPC core interrupt.
 315  */
 316 static irqreturn_t
 317 fs_enet_interrupt(int irq, void *dev_id)
 318 {
 319         struct net_device *dev = dev_id;
 320         struct fs_enet_private *fep;
 321         const struct fs_platform_info *fpi;
 322         u32 int_events;
 323         u32 int_clr_events;
 324         int nr, napi_ok;
 325         int handled;
 326
 327         fep = netdev_priv(dev);
 328         fpi = fep->fpi;
 329
 330         nr = 0;
 331         while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
 332                 nr++;
 333
 334                 int_clr_events = int_events;
 335                 int_clr_events &= ~fep->ev_napi;
 336
 337                 (*fep->ops->clear_int_events)(dev, int_clr_events);
 338
 339                 if (int_events & fep->ev_err)
 340                         (*fep->ops->ev_error)(dev, int_events);
 341
 342                 if (int_events & fep->ev) {
 343                         napi_ok = napi_schedule_prep(&fep->napi);
 344
 345                         (*fep->ops->napi_disable)(dev);
 346                         (*fep->ops->clear_int_events)(dev, fep->ev_napi);
 347
 348                         /* NOTE: it is possible for FCCs in NAPI mode    */
 349                         /* to submit a spurious interrupt while in poll  */
 350                         if (napi_ok)
 351                                 __napi_schedule(&fep->napi);
 352                 }
 353
 354         }
 355
 356         handled = nr > 0;
 357         return IRQ_RETVAL(handled);
 358 }
 359
 360 void fs_init_bds(struct net_device *dev)
 361 {
 362         struct fs_enet_private *fep = netdev_priv(dev);
 363         cbd_t __iomem *bdp;
 364         struct sk_buff *skb;
 365         int i;
 366
 367         fs_cleanup_bds(dev);
 368
 369         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 370         fep->tx_free = fep->tx_ring;
 371         fep->cur_rx = fep->rx_bd_base;
 372
 373         /*
 374          * Initialize the receive buffer descriptors.
 375          */
 376         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 377                 skb = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
 378                 if (skb == NULL)
 379                         break;
 380
 381                 skb_align(skb, ENET_RX_ALIGN);
 382                 fep->rx_skbuff[i] = skb;
 383                 CBDW_BUFADDR(bdp,
 384                         dma_map_single(fep->dev, skb->data,
 385                                 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 386                                 DMA_FROM_DEVICE));
 387                 CBDW_DATLEN(bdp, 0);    /* zero */
 388                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 389                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 390         }
 391         /*
 392          * if we failed, fillup remainder
 393          */
 394         for (; i < fep->rx_ring; i++, bdp++) {
 395                 fep->rx_skbuff[i] = NULL;
 396                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 397         }
 398
 399         /*
 400          * ...and the same for transmit.
 401          */
 402         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 403                 fep->tx_skbuff[i] = NULL;
 404                 CBDW_BUFADDR(bdp, 0);
 405                 CBDW_DATLEN(bdp, 0);
 406                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 407         }
 408 }
 409
 410 void fs_cleanup_bds(struct net_device *dev)
 411 {
 412         struct fs_enet_private *fep = netdev_priv(dev);
 413         struct sk_buff *skb;
 414         cbd_t __iomem *bdp;
 415         int i;
 416
 417         /*
 418          * Reset SKB transmit buffers.
 419          */
 420         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 421                 if ((skb = fep->tx_skbuff[i]) == NULL)
 422                         continue;
 423
 424                 /* unmap */
 425                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 426                                 skb->len, DMA_TO_DEVICE);
 427
 428                 fep->tx_skbuff[i] = NULL;
 429                 dev_kfree_skb(skb);
 430         }
 431
 432         /*
 433          * Reset SKB receive buffers
 434          */
 435         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 436                 if ((skb = fep->rx_skbuff[i]) == NULL)
 437                         continue;
 438
 439                 /* unmap */
 440                 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
 441                         L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 442                         DMA_FROM_DEVICE);
 443
 444                 fep->rx_skbuff[i] = NULL;
 445
 446                 dev_kfree_skb(skb);
 447         }
 448 }
 449
 450 /**********************************************************************************/
 451
 452 #ifdef CONFIG_FS_ENET_MPC5121_FEC
 453 /*
 454  * MPC5121 FEC requeries 4-byte alignment for TX data buffer!
 455  */
 456 static struct sk_buff *tx_skb_align_workaround(struct net_device *dev,
 457                                                struct sk_buff *skb)
 458 {
 459         struct sk_buff *new_skb;
 460
 461         if (skb_linearize(skb))
 462                 return NULL;
 463
 464         /* Alloc new skb */
 465         new_skb = netdev_alloc_skb(dev, skb->len + 4);
 466         if (!new_skb)
 467                 return NULL;
 468
 469         /* Make sure new skb is properly aligned */
 470         skb_align(new_skb, 4);
 471
 472         /* Copy data to new skb ... */
 473         skb_copy_from_linear_data(skb, new_skb->data, skb->len);
 474         skb_put(new_skb, skb->len);
 475
 476         /* ... and free an old one */
 477         dev_kfree_skb_any(skb);
 478
 479         return new_skb;
 480 }
 481 #endif
 482
 483 static netdev_tx_t
 484 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(skb_frag_off(frag), 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         dev->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++;
 567                         curidx++;
 568                 } else {
 569                         bdp = fep->tx_bd_base;
 570                         curidx = 0;
 571                 }
 572
 573                 len = skb_frag_size(frag);
 574                 CBDW_BUFADDR(bdp, skb_frag_dma_map(fep->dev, frag, 0, len,
 575                                                    DMA_TO_DEVICE));
 576                 CBDW_DATLEN(bdp, len);
 577
 578                 fep->tx_skbuff[curidx] = NULL;
 579                 fep->mapped_as_page[curidx] = 1;
 580
 581                 frag++;
 582                 nr_frags--;
 583         }
 584
 585         /* Trigger transmission start */
 586         sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
 587              BD_ENET_TX_LAST | BD_ENET_TX_TC;
 588
 589         /* note that while FEC does not have this bit
 590          * it marks it as available for software use
 591          * yay for hw reuse :) */
 592         if (skb->len <= 60)
 593                 sc |= BD_ENET_TX_PAD;
 594         CBDC_SC(bdp, BD_ENET_TX_STATS);
 595         CBDS_SC(bdp, sc);
 596
 597         /* Save skb pointer. */
 598         fep->tx_skbuff[curidx] = skb;
 599
 600         /* If this was the last BD in the ring, start at the beginning again. */
 601         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 602                 bdp++;
 603         else
 604                 bdp = fep->tx_bd_base;
 605         fep->cur_tx = bdp;
 606
 607         if (fep->tx_free < MAX_SKB_FRAGS)
 608                 netif_stop_queue(dev);
 609
 610         skb_tx_timestamp(skb);
 611
 612         (*fep->ops->tx_kickstart)(dev);
 613
 614         spin_unlock(&fep->tx_lock);
 615
 616         return NETDEV_TX_OK;
 617 }
 618
 619 static void fs_timeout_work(struct work_struct *work)
 620 {
 621         struct fs_enet_private *fep = container_of(work, struct fs_enet_private,
 622                                                    timeout_work);
 623         struct net_device *dev = fep->ndev;
 624         unsigned long flags;
 625         int wake = 0;
 626
 627         dev->stats.tx_errors++;
 628
 629         spin_lock_irqsave(&fep->lock, flags);
 630
 631         if (dev->flags & IFF_UP) {
 632                 phy_stop(dev->phydev);
 633                 (*fep->ops->stop)(dev);
 634                 (*fep->ops->restart)(dev);
 635         }
 636
 637         phy_start(dev->phydev);
 638         wake = fep->tx_free >= MAX_SKB_FRAGS &&
 639                !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 640         spin_unlock_irqrestore(&fep->lock, flags);
 641
 642         if (wake)
 643                 netif_wake_queue(dev);
 644 }
 645
 646 static void fs_timeout(struct net_device *dev, unsigned int txqueue)
 647 {
 648         struct fs_enet_private *fep = netdev_priv(dev);
 649
 650         schedule_work(&fep->timeout_work);
 651 }
 652
 653 /*-----------------------------------------------------------------------------
 654  *  generic link-change handler - should be sufficient for most cases
 655  *-----------------------------------------------------------------------------*/
 656 static void generic_adjust_link(struct  net_device *dev)
 657 {
 658         struct fs_enet_private *fep = netdev_priv(dev);
 659         struct phy_device *phydev = dev->phydev;
 660         int new_state = 0;
 661
 662         if (phydev->link) {
 663                 /* adjust to duplex mode */
 664                 if (phydev->duplex != fep->oldduplex) {
 665                         new_state = 1;
 666                         fep->oldduplex = phydev->duplex;
 667                 }
 668
 669                 if (phydev->speed != fep->oldspeed) {
 670                         new_state = 1;
 671                         fep->oldspeed = phydev->speed;
 672                 }
 673
 674                 if (!fep->oldlink) {
 675                         new_state = 1;
 676                         fep->oldlink = 1;
 677                 }
 678
 679                 if (new_state)
 680                         fep->ops->restart(dev);
 681         } else if (fep->oldlink) {
 682                 new_state = 1;
 683                 fep->oldlink = 0;
 684                 fep->oldspeed = 0;
 685                 fep->oldduplex = -1;
 686         }
 687
 688         if (new_state && netif_msg_link(fep))
 689                 phy_print_status(phydev);
 690 }
 691
 692
 693 static void fs_adjust_link(struct net_device *dev)
 694 {
 695         struct fs_enet_private *fep = netdev_priv(dev);
 696         unsigned long flags;
 697
 698         spin_lock_irqsave(&fep->lock, flags);
 699
 700         if(fep->ops->adjust_link)
 701                 fep->ops->adjust_link(dev);
 702         else
 703                 generic_adjust_link(dev);
 704
 705         spin_unlock_irqrestore(&fep->lock, flags);
 706 }
 707
 708 static int fs_init_phy(struct net_device *dev)
 709 {
 710         struct fs_enet_private *fep = netdev_priv(dev);
 711         struct phy_device *phydev;
 712         phy_interface_t iface;
 713
 714         fep->oldlink = 0;
 715         fep->oldspeed = 0;
 716         fep->oldduplex = -1;
 717
 718         iface = fep->fpi->use_rmii ?
 719                 PHY_INTERFACE_MODE_RMII : PHY_INTERFACE_MODE_MII;
 720
 721         phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
 722                                 iface);
 723         if (!phydev) {
 724                 dev_err(&dev->dev, "Could not attach to PHY\n");
 725                 return -ENODEV;
 726         }
 727
 728         return 0;
 729 }
 730
 731 static int fs_enet_open(struct net_device *dev)
 732 {
 733         struct fs_enet_private *fep = netdev_priv(dev);
 734         int r;
 735         int err;
 736
 737         /* to initialize the fep->cur_rx,... */
 738         /* not doing this, will cause a crash in fs_enet_napi */
 739         fs_init_bds(fep->ndev);
 740
 741         napi_enable(&fep->napi);
 742
 743         /* Install our interrupt handler. */
 744         r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
 745                         "fs_enet-mac", dev);
 746         if (r != 0) {
 747                 dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
 748                 napi_disable(&fep->napi);
 749                 return -EINVAL;
 750         }
 751
 752         err = fs_init_phy(dev);
 753         if (err) {
 754                 free_irq(fep->interrupt, dev);
 755                 napi_disable(&fep->napi);
 756                 return err;
 757         }
 758         phy_start(dev->phydev);
 759
 760         netif_start_queue(dev);
 761
 762         return 0;
 763 }
 764
 765 static int fs_enet_close(struct net_device *dev)
 766 {
 767         struct fs_enet_private *fep = netdev_priv(dev);
 768         unsigned long flags;
 769
 770         netif_stop_queue(dev);
 771         netif_carrier_off(dev);
 772         napi_disable(&fep->napi);
 773         cancel_work_sync(&fep->timeout_work);
 774         phy_stop(dev->phydev);
 775
 776         spin_lock_irqsave(&fep->lock, flags);
 777         spin_lock(&fep->tx_lock);
 778         (*fep->ops->stop)(dev);
 779         spin_unlock(&fep->tx_lock);
 780         spin_unlock_irqrestore(&fep->lock, flags);
 781
 782         /* release any irqs */
 783         phy_disconnect(dev->phydev);
 784         free_irq(fep->interrupt, dev);
 785
 786         return 0;
 787 }
 788
 789 /*************************************************************************/
 790
 791 static void fs_get_drvinfo(struct net_device *dev,
 792                             struct ethtool_drvinfo *info)
 793 {
 794         strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
 795 }
 796
 797 static int fs_get_regs_len(struct net_device *dev)
 798 {
 799         struct fs_enet_private *fep = netdev_priv(dev);
 800
 801         return (*fep->ops->get_regs_len)(dev);
 802 }
 803
 804 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 805                          void *p)
 806 {
 807         struct fs_enet_private *fep = netdev_priv(dev);
 808         unsigned long flags;
 809         int r, len;
 810
 811         len = regs->len;
 812
 813         spin_lock_irqsave(&fep->lock, flags);
 814         r = (*fep->ops->get_regs)(dev, p, &len);
 815         spin_unlock_irqrestore(&fep->lock, flags);
 816
 817         if (r == 0)
 818                 regs->version = 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 = phy_ethtool_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 /**************************************************************************************/
 887
 888 #ifdef CONFIG_FS_ENET_HAS_FEC
 889 #define IS_FEC(match) ((match)->data == &fs_fec_ops)
 890 #else
 891 #define IS_FEC(match) 0
 892 #endif
 893
 894 static const struct net_device_ops fs_enet_netdev_ops = {
 895         .ndo_open               = fs_enet_open,
 896         .ndo_stop               = fs_enet_close,
 897         .ndo_start_xmit         = fs_enet_start_xmit,
 898         .ndo_tx_timeout         = fs_timeout,
 899         .ndo_set_rx_mode        = fs_set_multicast_list,
 900         .ndo_eth_ioctl          = phy_do_ioctl_running,
 901         .ndo_validate_addr      = eth_validate_addr,
 902         .ndo_set_mac_address    = eth_mac_addr,
 903 #ifdef CONFIG_NET_POLL_CONTROLLER
 904         .ndo_poll_controller    = fs_enet_netpoll,
 905 #endif
 906 };
 907
 908 static const struct of_device_id fs_enet_match[];
 909 static int fs_enet_probe(struct platform_device *ofdev)
 910 {
 911         const struct of_device_id *match;
 912         struct net_device *ndev;
 913         struct fs_enet_private *fep;
 914         struct fs_platform_info *fpi;
 915         const u32 *data;
 916         struct clk *clk;
 917         int err;
 918         const char *phy_connection_type;
 919         int privsize, len, ret = -ENODEV;
 920
 921         match = of_match_device(fs_enet_match, &ofdev->dev);
 922         if (!match)
 923                 return -EINVAL;
 924
 925         fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
 926         if (!fpi)
 927                 return -ENOMEM;
 928
 929         if (!IS_FEC(match)) {
 930                 data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
 931                 if (!data || len != 4)
 932                         goto out_free_fpi;
 933
 934                 fpi->cp_command = *data;
 935         }
 936
 937         fpi->rx_ring = RX_RING_SIZE;
 938         fpi->tx_ring = TX_RING_SIZE;
 939         fpi->rx_copybreak = 240;
 940         fpi->napi_weight = 17;
 941         fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
 942         if (!fpi->phy_node && of_phy_is_fixed_link(ofdev->dev.of_node)) {
 943                 err = of_phy_register_fixed_link(ofdev->dev.of_node);
 944                 if (err)
 945                         goto out_free_fpi;
 946
 947                 /* In the case of a fixed PHY, the DT node associated
 948                  * to the PHY is the Ethernet MAC DT node.
 949                  */
 950                 fpi->phy_node = of_node_get(ofdev->dev.of_node);
 951         }
 952
 953         if (of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc5125-fec")) {
 954                 phy_connection_type = of_get_property(ofdev->dev.of_node,
 955                                                 "phy-connection-type", NULL);
 956                 if (phy_connection_type && !strcmp("rmii", phy_connection_type))
 957                         fpi->use_rmii = 1;
 958         }
 959
 960         /* make clock lookup non-fatal (the driver is shared among platforms),
 961          * but require enable to succeed when a clock was specified/found,
 962          * keep a reference to the clock upon successful acquisition
 963          */
 964         clk = devm_clk_get(&ofdev->dev, "per");
 965         if (!IS_ERR(clk)) {
 966                 ret = clk_prepare_enable(clk);
 967                 if (ret)
 968                         goto out_deregister_fixed_link;
 969
 970                 fpi->clk_per = clk;
 971         }
 972
 973         privsize = sizeof(*fep) +
 974                    sizeof(struct sk_buff **) *
 975                      (fpi->rx_ring + fpi->tx_ring) +
 976                    sizeof(char) * fpi->tx_ring;
 977
 978         ndev = alloc_etherdev(privsize);
 979         if (!ndev) {
 980                 ret = -ENOMEM;
 981                 goto out_put;
 982         }
 983
 984         SET_NETDEV_DEV(ndev, &ofdev->dev);
 985         platform_set_drvdata(ofdev, ndev);
 986
 987         fep = netdev_priv(ndev);
 988         fep->dev = &ofdev->dev;
 989         fep->ndev = ndev;
 990         fep->fpi = fpi;
 991         fep->ops = match->data;
 992
 993         ret = fep->ops->setup_data(ndev);
 994         if (ret)
 995                 goto out_free_dev;
 996
 997         fep->rx_skbuff = (struct sk_buff **)&fep[1];
 998         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
 999         fep->mapped_as_page = (char *)(fep->rx_skbuff + fpi->rx_ring +
1000                                        fpi->tx_ring);
1001
1002         spin_lock_init(&fep->lock);
1003         spin_lock_init(&fep->tx_lock);
1004
1005         of_get_ethdev_address(ofdev->dev.of_node, ndev);
1006
1007         ret = fep->ops->allocate_bd(ndev);
1008         if (ret)
1009                 goto out_cleanup_data;
1010
1011         fep->rx_bd_base = fep->ring_base;
1012         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1013
1014         fep->tx_ring = fpi->tx_ring;
1015         fep->rx_ring = fpi->rx_ring;
1016
1017         ndev->netdev_ops = &fs_enet_netdev_ops;
1018         ndev->watchdog_timeo = 2 * HZ;
1019         INIT_WORK(&fep->timeout_work, fs_timeout_work);
1020         netif_napi_add_weight(ndev, &fep->napi, fs_enet_napi,
1021                               fpi->napi_weight);
1022
1023         ndev->ethtool_ops = &fs_ethtool_ops;
1024
1025         netif_carrier_off(ndev);
1026
1027         ndev->features |= NETIF_F_SG;
1028
1029         ret = register_netdev(ndev);
1030         if (ret)
1031                 goto out_free_bd;
1032
1033         pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
1034
1035         return 0;
1036
1037 out_free_bd:
1038         fep->ops->free_bd(ndev);
1039 out_cleanup_data:
1040         fep->ops->cleanup_data(ndev);
1041 out_free_dev:
1042         free_netdev(ndev);
1043 out_put:
1044         clk_disable_unprepare(fpi->clk_per);
1045 out_deregister_fixed_link:
1046         of_node_put(fpi->phy_node);
1047         if (of_phy_is_fixed_link(ofdev->dev.of_node))
1048                 of_phy_deregister_fixed_link(ofdev->dev.of_node);
1049 out_free_fpi:
1050         kfree(fpi);
1051         return ret;
1052 }
1053
1054 static void fs_enet_remove(struct platform_device *ofdev)
1055 {
1056         struct net_device *ndev = platform_get_drvdata(ofdev);
1057         struct fs_enet_private *fep = netdev_priv(ndev);
1058
1059         unregister_netdev(ndev);
1060
1061         fep->ops->free_bd(ndev);
1062         fep->ops->cleanup_data(ndev);
1063         dev_set_drvdata(fep->dev, NULL);
1064         of_node_put(fep->fpi->phy_node);
1065         clk_disable_unprepare(fep->fpi->clk_per);
1066         if (of_phy_is_fixed_link(ofdev->dev.of_node))
1067                 of_phy_deregister_fixed_link(ofdev->dev.of_node);
1068         free_netdev(ndev);
1069 }
1070
1071 static const struct of_device_id fs_enet_match[] = {
1072 #ifdef CONFIG_FS_ENET_HAS_SCC
1073         {
1074                 .compatible = "fsl,cpm1-scc-enet",
1075                 .data = (void *)&fs_scc_ops,
1076         },
1077         {
1078                 .compatible = "fsl,cpm2-scc-enet",
1079                 .data = (void *)&fs_scc_ops,
1080         },
1081 #endif
1082 #ifdef CONFIG_FS_ENET_HAS_FCC
1083         {
1084                 .compatible = "fsl,cpm2-fcc-enet",
1085                 .data = (void *)&fs_fcc_ops,
1086         },
1087 #endif
1088 #ifdef CONFIG_FS_ENET_HAS_FEC
1089 #ifdef CONFIG_FS_ENET_MPC5121_FEC
1090         {
1091                 .compatible = "fsl,mpc5121-fec",
1092                 .data = (void *)&fs_fec_ops,
1093         },
1094         {
1095                 .compatible = "fsl,mpc5125-fec",
1096                 .data = (void *)&fs_fec_ops,
1097         },
1098 #else
1099         {
1100                 .compatible = "fsl,pq1-fec-enet",
1101                 .data = (void *)&fs_fec_ops,
1102         },
1103 #endif
1104 #endif
1105         {}
1106 };
1107 MODULE_DEVICE_TABLE(of, fs_enet_match);
1108
1109 static struct platform_driver fs_enet_driver = {
1110         .driver = {
1111                 .name = "fs_enet",
1112                 .of_match_table = fs_enet_match,
1113         },
1114         .probe = fs_enet_probe,
1115         .remove_new = fs_enet_remove,
1116 };
1117
1118 #ifdef CONFIG_NET_POLL_CONTROLLER
1119 static void fs_enet_netpoll(struct net_device *dev)
1120 {
1121        disable_irq(dev->irq);
1122        fs_enet_interrupt(dev->irq, dev);
1123        enable_irq(dev->irq);
1124 }
1125 #endif
1126
1127 module_platform_driver(fs_enet_driver);