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_work(struct work_struct *work)
 617 {
 618         struct fs_enet_private *fep = container_of(work, struct fs_enet_private,
 619                                                    timeout_work);
 620         struct net_device *dev = fep->ndev;
 621         unsigned long flags;
 622         int wake = 0;
 623
 624         fep->stats.tx_errors++;
 625
 626         spin_lock_irqsave(&fep->lock, flags);
 627
 628         if (dev->flags & IFF_UP) {
 629                 phy_stop(dev->phydev);
 630                 (*fep->ops->stop)(dev);
 631                 (*fep->ops->restart)(dev);
 632         }
 633
 634         phy_start(dev->phydev);
 635         wake = fep->tx_free >= MAX_SKB_FRAGS &&
 636                !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
 637         spin_unlock_irqrestore(&fep->lock, flags);
 638
 639         if (wake)
 640                 netif_wake_queue(dev);
 641 }
 642
 643 static void fs_timeout(struct net_device *dev)
 644 {
 645         struct fs_enet_private *fep = netdev_priv(dev);
 646
 647         schedule_work(&fep->timeout_work);
 648 }
 649
 650 /*-----------------------------------------------------------------------------
 651  *  generic link-change handler - should be sufficient for most cases
 652  *-----------------------------------------------------------------------------*/
 653 static void generic_adjust_link(struct  net_device *dev)
 654 {
 655         struct fs_enet_private *fep = netdev_priv(dev);
 656         struct phy_device *phydev = dev->phydev;
 657         int new_state = 0;
 658
 659         if (phydev->link) {
 660                 /* adjust to duplex mode */
 661                 if (phydev->duplex != fep->oldduplex) {
 662                         new_state = 1;
 663                         fep->oldduplex = phydev->duplex;
 664                 }
 665
 666                 if (phydev->speed != fep->oldspeed) {
 667                         new_state = 1;
 668                         fep->oldspeed = phydev->speed;
 669                 }
 670
 671                 if (!fep->oldlink) {
 672                         new_state = 1;
 673                         fep->oldlink = 1;
 674                 }
 675
 676                 if (new_state)
 677                         fep->ops->restart(dev);
 678         } else if (fep->oldlink) {
 679                 new_state = 1;
 680                 fep->oldlink = 0;
 681                 fep->oldspeed = 0;
 682                 fep->oldduplex = -1;
 683         }
 684
 685         if (new_state && netif_msg_link(fep))
 686                 phy_print_status(phydev);
 687 }
 688
 689
 690 static void fs_adjust_link(struct net_device *dev)
 691 {
 692         struct fs_enet_private *fep = netdev_priv(dev);
 693         unsigned long flags;
 694
 695         spin_lock_irqsave(&fep->lock, flags);
 696
 697         if(fep->ops->adjust_link)
 698                 fep->ops->adjust_link(dev);
 699         else
 700                 generic_adjust_link(dev);
 701
 702         spin_unlock_irqrestore(&fep->lock, flags);
 703 }
 704
 705 static int fs_init_phy(struct net_device *dev)
 706 {
 707         struct fs_enet_private *fep = netdev_priv(dev);
 708         struct phy_device *phydev;
 709         phy_interface_t iface;
 710
 711         fep->oldlink = 0;
 712         fep->oldspeed = 0;
 713         fep->oldduplex = -1;
 714
 715         iface = fep->fpi->use_rmii ?
 716                 PHY_INTERFACE_MODE_RMII : PHY_INTERFACE_MODE_MII;
 717
 718         phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
 719                                 iface);
 720         if (!phydev) {
 721                 dev_err(&dev->dev, "Could not attach to PHY\n");
 722                 return -ENODEV;
 723         }
 724
 725         return 0;
 726 }
 727
 728 static int fs_enet_open(struct net_device *dev)
 729 {
 730         struct fs_enet_private *fep = netdev_priv(dev);
 731         int r;
 732         int err;
 733
 734         /* to initialize the fep->cur_rx,... */
 735         /* not doing this, will cause a crash in fs_enet_napi */
 736         fs_init_bds(fep->ndev);
 737
 738         napi_enable(&fep->napi);
 739
 740         /* Install our interrupt handler. */
 741         r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
 742                         "fs_enet-mac", dev);
 743         if (r != 0) {
 744                 dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
 745                 napi_disable(&fep->napi);
 746                 return -EINVAL;
 747         }
 748
 749         err = fs_init_phy(dev);
 750         if (err) {
 751                 free_irq(fep->interrupt, dev);
 752                 napi_disable(&fep->napi);
 753                 return err;
 754         }
 755         phy_start(dev->phydev);
 756
 757         netif_start_queue(dev);
 758
 759         return 0;
 760 }
 761
 762 static int fs_enet_close(struct net_device *dev)
 763 {
 764         struct fs_enet_private *fep = netdev_priv(dev);
 765         unsigned long flags;
 766
 767         netif_stop_queue(dev);
 768         netif_carrier_off(dev);
 769         napi_disable(&fep->napi);
 770         cancel_work_sync(&fep->timeout_work);
 771         phy_stop(dev->phydev);
 772
 773         spin_lock_irqsave(&fep->lock, flags);
 774         spin_lock(&fep->tx_lock);
 775         (*fep->ops->stop)(dev);
 776         spin_unlock(&fep->tx_lock);
 777         spin_unlock_irqrestore(&fep->lock, flags);
 778
 779         /* release any irqs */
 780         phy_disconnect(dev->phydev);
 781         free_irq(fep->interrupt, dev);
 782
 783         return 0;
 784 }
 785
 786 static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
 787 {
 788         struct fs_enet_private *fep = netdev_priv(dev);
 789         return &fep->stats;
 790 }
 791
 792 /*************************************************************************/
 793
 794 static void fs_get_drvinfo(struct net_device *dev,
 795                             struct ethtool_drvinfo *info)
 796 {
 797         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
 798         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
 799 }
 800
 801 static int fs_get_regs_len(struct net_device *dev)
 802 {
 803         struct fs_enet_private *fep = netdev_priv(dev);
 804
 805         return (*fep->ops->get_regs_len)(dev);
 806 }
 807
 808 static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 809                          void *p)
 810 {
 811         struct fs_enet_private *fep = netdev_priv(dev);
 812         unsigned long flags;
 813         int r, len;
 814
 815         len = regs->len;
 816
 817         spin_lock_irqsave(&fep->lock, flags);
 818         r = (*fep->ops->get_regs)(dev, p, &len);
 819         spin_unlock_irqrestore(&fep->lock, flags);
 820
 821         if (r == 0)
 822                 regs->version = 0;
 823 }
 824
 825 static int fs_nway_reset(struct net_device *dev)
 826 {
 827         return 0;
 828 }
 829
 830 static u32 fs_get_msglevel(struct net_device *dev)
 831 {
 832         struct fs_enet_private *fep = netdev_priv(dev);
 833         return fep->msg_enable;
 834 }
 835
 836 static void fs_set_msglevel(struct net_device *dev, u32 value)
 837 {
 838         struct fs_enet_private *fep = netdev_priv(dev);
 839         fep->msg_enable = value;
 840 }
 841
 842 static int fs_get_tunable(struct net_device *dev,
 843                           const struct ethtool_tunable *tuna, void *data)
 844 {
 845         struct fs_enet_private *fep = netdev_priv(dev);
 846         struct fs_platform_info *fpi = fep->fpi;
 847         int ret = 0;
 848
 849         switch (tuna->id) {
 850         case ETHTOOL_RX_COPYBREAK:
 851                 *(u32 *)data = fpi->rx_copybreak;
 852                 break;
 853         default:
 854                 ret = -EINVAL;
 855                 break;
 856         }
 857
 858         return ret;
 859 }
 860
 861 static int fs_set_tunable(struct net_device *dev,
 862                           const struct ethtool_tunable *tuna, const void *data)
 863 {
 864         struct fs_enet_private *fep = netdev_priv(dev);
 865         struct fs_platform_info *fpi = fep->fpi;
 866         int ret = 0;
 867
 868         switch (tuna->id) {
 869         case ETHTOOL_RX_COPYBREAK:
 870                 fpi->rx_copybreak = *(u32 *)data;
 871                 break;
 872         default:
 873                 ret = -EINVAL;
 874                 break;
 875         }
 876
 877         return ret;
 878 }
 879
 880 static const struct ethtool_ops fs_ethtool_ops = {
 881         .get_drvinfo = fs_get_drvinfo,
 882         .get_regs_len = fs_get_regs_len,
 883         .nway_reset = fs_nway_reset,
 884         .get_link = ethtool_op_get_link,
 885         .get_msglevel = fs_get_msglevel,
 886         .set_msglevel = fs_set_msglevel,
 887         .get_regs = fs_get_regs,
 888         .get_ts_info = ethtool_op_get_ts_info,
 889         .get_link_ksettings = phy_ethtool_get_link_ksettings,
 890         .set_link_ksettings = phy_ethtool_set_link_ksettings,
 891         .get_tunable = fs_get_tunable,
 892         .set_tunable = fs_set_tunable,
 893 };
 894
 895 static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 896 {
 897         if (!netif_running(dev))
 898                 return -EINVAL;
 899
 900         return phy_mii_ioctl(dev->phydev, rq, cmd);
 901 }
 902
 903 extern int fs_mii_connect(struct net_device *dev);
 904 extern void fs_mii_disconnect(struct net_device *dev);
 905
 906 /**************************************************************************************/
 907
 908 #ifdef CONFIG_FS_ENET_HAS_FEC
 909 #define IS_FEC(match) ((match)->data == &fs_fec_ops)
 910 #else
 911 #define IS_FEC(match) 0
 912 #endif
 913
 914 static const struct net_device_ops fs_enet_netdev_ops = {
 915         .ndo_open               = fs_enet_open,
 916         .ndo_stop               = fs_enet_close,
 917         .ndo_get_stats          = fs_enet_get_stats,
 918         .ndo_start_xmit         = fs_enet_start_xmit,
 919         .ndo_tx_timeout         = fs_timeout,
 920         .ndo_set_rx_mode        = fs_set_multicast_list,
 921         .ndo_do_ioctl           = fs_ioctl,
 922         .ndo_validate_addr      = eth_validate_addr,
 923         .ndo_set_mac_address    = eth_mac_addr,
 924         .ndo_change_mtu         = eth_change_mtu,
 925 #ifdef CONFIG_NET_POLL_CONTROLLER
 926         .ndo_poll_controller    = fs_enet_netpoll,
 927 #endif
 928 };
 929
 930 static const struct of_device_id fs_enet_match[];
 931 static int fs_enet_probe(struct platform_device *ofdev)
 932 {
 933         const struct of_device_id *match;
 934         struct net_device *ndev;
 935         struct fs_enet_private *fep;
 936         struct fs_platform_info *fpi;
 937         const u32 *data;
 938         struct clk *clk;
 939         int err;
 940         const u8 *mac_addr;
 941         const char *phy_connection_type;
 942         int privsize, len, ret = -ENODEV;
 943
 944         match = of_match_device(fs_enet_match, &ofdev->dev);
 945         if (!match)
 946                 return -EINVAL;
 947
 948         fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
 949         if (!fpi)
 950                 return -ENOMEM;
 951
 952         if (!IS_FEC(match)) {
 953                 data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
 954                 if (!data || len != 4)
 955                         goto out_free_fpi;
 956
 957                 fpi->cp_command = *data;
 958         }
 959
 960         fpi->rx_ring = RX_RING_SIZE;
 961         fpi->tx_ring = TX_RING_SIZE;
 962         fpi->rx_copybreak = 240;
 963         fpi->napi_weight = 17;
 964         fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
 965         if (!fpi->phy_node && of_phy_is_fixed_link(ofdev->dev.of_node)) {
 966                 err = of_phy_register_fixed_link(ofdev->dev.of_node);
 967                 if (err)
 968                         goto out_free_fpi;
 969
 970                 /* In the case of a fixed PHY, the DT node associated
 971                  * to the PHY is the Ethernet MAC DT node.
 972                  */
 973                 fpi->phy_node = of_node_get(ofdev->dev.of_node);
 974         }
 975
 976         if (of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc5125-fec")) {
 977                 phy_connection_type = of_get_property(ofdev->dev.of_node,
 978                                                 "phy-connection-type", NULL);
 979                 if (phy_connection_type && !strcmp("rmii", phy_connection_type))
 980                         fpi->use_rmii = 1;
 981         }
 982
 983         /* make clock lookup non-fatal (the driver is shared among platforms),
 984          * but require enable to succeed when a clock was specified/found,
 985          * keep a reference to the clock upon successful acquisition
 986          */
 987         clk = devm_clk_get(&ofdev->dev, "per");
 988         if (!IS_ERR(clk)) {
 989                 err = clk_prepare_enable(clk);
 990                 if (err) {
 991                         ret = err;
 992                         goto out_deregister_fixed_link;
 993                 }
 994                 fpi->clk_per = clk;
 995         }
 996
 997         privsize = sizeof(*fep) +
 998                    sizeof(struct sk_buff **) *
 999                      (fpi->rx_ring + fpi->tx_ring) +
1000                    sizeof(char) * fpi->tx_ring;
1001
1002         ndev = alloc_etherdev(privsize);
1003         if (!ndev) {
1004                 ret = -ENOMEM;
1005                 goto out_put;
1006         }
1007
1008         SET_NETDEV_DEV(ndev, &ofdev->dev);
1009         platform_set_drvdata(ofdev, ndev);
1010
1011         fep = netdev_priv(ndev);
1012         fep->dev = &ofdev->dev;
1013         fep->ndev = ndev;
1014         fep->fpi = fpi;
1015         fep->ops = match->data;
1016
1017         ret = fep->ops->setup_data(ndev);
1018         if (ret)
1019                 goto out_free_dev;
1020
1021         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1022         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1023         fep->mapped_as_page = (char *)(fep->rx_skbuff + fpi->rx_ring +
1024                                        fpi->tx_ring);
1025
1026         spin_lock_init(&fep->lock);
1027         spin_lock_init(&fep->tx_lock);
1028
1029         mac_addr = of_get_mac_address(ofdev->dev.of_node);
1030         if (mac_addr)
1031                 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
1032
1033         ret = fep->ops->allocate_bd(ndev);
1034         if (ret)
1035                 goto out_cleanup_data;
1036
1037         fep->rx_bd_base = fep->ring_base;
1038         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1039
1040         fep->tx_ring = fpi->tx_ring;
1041         fep->rx_ring = fpi->rx_ring;
1042
1043         ndev->netdev_ops = &fs_enet_netdev_ops;
1044         ndev->watchdog_timeo = 2 * HZ;
1045         INIT_WORK(&fep->timeout_work, fs_timeout_work);
1046         netif_napi_add(ndev, &fep->napi, fs_enet_napi, fpi->napi_weight);
1047
1048         ndev->ethtool_ops = &fs_ethtool_ops;
1049
1050         init_timer(&fep->phy_timer_list);
1051
1052         netif_carrier_off(ndev);
1053
1054         ndev->features |= NETIF_F_SG;
1055
1056         ret = register_netdev(ndev);
1057         if (ret)
1058                 goto out_free_bd;
1059
1060         pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
1061
1062         return 0;
1063
1064 out_free_bd:
1065         fep->ops->free_bd(ndev);
1066 out_cleanup_data:
1067         fep->ops->cleanup_data(ndev);
1068 out_free_dev:
1069         free_netdev(ndev);
1070 out_put:
1071         of_node_put(fpi->phy_node);
1072         if (fpi->clk_per)
1073                 clk_disable_unprepare(fpi->clk_per);
1074 out_deregister_fixed_link:
1075         if (of_phy_is_fixed_link(ofdev->dev.of_node))
1076                 of_phy_deregister_fixed_link(ofdev->dev.of_node);
1077 out_free_fpi:
1078         kfree(fpi);
1079         return ret;
1080 }
1081
1082 static int fs_enet_remove(struct platform_device *ofdev)
1083 {
1084         struct net_device *ndev = platform_get_drvdata(ofdev);
1085         struct fs_enet_private *fep = netdev_priv(ndev);
1086
1087         unregister_netdev(ndev);
1088
1089         fep->ops->free_bd(ndev);
1090         fep->ops->cleanup_data(ndev);
1091         dev_set_drvdata(fep->dev, NULL);
1092         of_node_put(fep->fpi->phy_node);
1093         if (fep->fpi->clk_per)
1094                 clk_disable_unprepare(fep->fpi->clk_per);
1095         if (of_phy_is_fixed_link(ofdev->dev.of_node))
1096                 of_phy_deregister_fixed_link(ofdev->dev.of_node);
1097         free_netdev(ndev);
1098         return 0;
1099 }
1100
1101 static const struct of_device_id fs_enet_match[] = {
1102 #ifdef CONFIG_FS_ENET_HAS_SCC
1103         {
1104                 .compatible = "fsl,cpm1-scc-enet",
1105                 .data = (void *)&fs_scc_ops,
1106         },
1107         {
1108                 .compatible = "fsl,cpm2-scc-enet",
1109                 .data = (void *)&fs_scc_ops,
1110         },
1111 #endif
1112 #ifdef CONFIG_FS_ENET_HAS_FCC
1113         {
1114                 .compatible = "fsl,cpm2-fcc-enet",
1115                 .data = (void *)&fs_fcc_ops,
1116         },
1117 #endif
1118 #ifdef CONFIG_FS_ENET_HAS_FEC
1119 #ifdef CONFIG_FS_ENET_MPC5121_FEC
1120         {
1121                 .compatible = "fsl,mpc5121-fec",
1122                 .data = (void *)&fs_fec_ops,
1123         },
1124         {
1125                 .compatible = "fsl,mpc5125-fec",
1126                 .data = (void *)&fs_fec_ops,
1127         },
1128 #else
1129         {
1130                 .compatible = "fsl,pq1-fec-enet",
1131                 .data = (void *)&fs_fec_ops,
1132         },
1133 #endif
1134 #endif
1135         {}
1136 };
1137 MODULE_DEVICE_TABLE(of, fs_enet_match);
1138
1139 static struct platform_driver fs_enet_driver = {
1140         .driver = {
1141                 .name = "fs_enet",
1142                 .of_match_table = fs_enet_match,
1143         },
1144         .probe = fs_enet_probe,
1145         .remove = fs_enet_remove,
1146 };
1147
1148 #ifdef CONFIG_NET_POLL_CONTROLLER
1149 static void fs_enet_netpoll(struct net_device *dev)
1150 {
1151        disable_irq(dev->irq);
1152        fs_enet_interrupt(dev->irq, dev);
1153        enable_irq(dev->irq);
1154 }
1155 #endif
1156
1157 module_platform_driver(fs_enet_driver);