linux/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
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   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
  53MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  54MODULE_DESCRIPTION("Freescale Ethernet Driver");
  55MODULE_LICENSE("GPL");
  56
  57static int fs_enet_debug = -1; /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
  58module_param(fs_enet_debug, int, 0);
  59MODULE_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
  66static void fs_enet_netpoll(struct net_device *dev);
  67#endif
  68
  69static 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
  76static 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 */
  85static 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 */
 316static irqreturn_t
 317fs_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
 360void 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
 410void 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 */
 456static 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
 483static netdev_tx_t
 484fs_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
 619static 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
 646static 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 *-----------------------------------------------------------------------------*/
 656static 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
 693static 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
 708static 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
 731static 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
 765static 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
 791static void fs_get_drvinfo(struct net_device *dev,
 792                            struct ethtool_drvinfo *info)
 793{
 794        strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
 795}
 796
 797static 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
 804static 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
 821static 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
 827static 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
 833static 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
 852static 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
 871static 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
 886extern int fs_mii_connect(struct net_device *dev);
 887extern void fs_mii_disconnect(struct net_device *dev);
 888
 889/**************************************************************************************/
 890
 891#ifdef CONFIG_FS_ENET_HAS_FEC
 892#define IS_FEC(match) ((match)->data == &fs_fec_ops)
 893#else
 894#define IS_FEC(match) 0
 895#endif
 896
 897static const struct net_device_ops fs_enet_netdev_ops = {
 898        .ndo_open               = fs_enet_open,
 899        .ndo_stop               = fs_enet_close,
 900        .ndo_start_xmit         = fs_enet_start_xmit,
 901        .ndo_tx_timeout         = fs_timeout,
 902        .ndo_set_rx_mode        = fs_set_multicast_list,
 903        .ndo_do_ioctl           = phy_do_ioctl_running,
 904        .ndo_validate_addr      = eth_validate_addr,
 905        .ndo_set_mac_address    = eth_mac_addr,
 906#ifdef CONFIG_NET_POLL_CONTROLLER
 907        .ndo_poll_controller    = fs_enet_netpoll,
 908#endif
 909};
 910
 911static const struct of_device_id fs_enet_match[];
 912static int fs_enet_probe(struct platform_device *ofdev)
 913{
 914        const struct of_device_id *match;
 915        struct net_device *ndev;
 916        struct fs_enet_private *fep;
 917        struct fs_platform_info *fpi;
 918        const u32 *data;
 919        struct clk *clk;
 920        int err;
 921        const u8 *mac_addr;
 922        const char *phy_connection_type;
 923        int privsize, len, ret = -ENODEV;
 924
 925        match = of_match_device(fs_enet_match, &ofdev->dev);
 926        if (!match)
 927                return -EINVAL;
 928
 929        fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
 930        if (!fpi)
 931                return -ENOMEM;
 932
 933        if (!IS_FEC(match)) {
 934                data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
 935                if (!data || len != 4)
 936                        goto out_free_fpi;
 937
 938                fpi->cp_command = *data;
 939        }
 940
 941        fpi->rx_ring = RX_RING_SIZE;
 942        fpi->tx_ring = TX_RING_SIZE;
 943        fpi->rx_copybreak = 240;
 944        fpi->napi_weight = 17;
 945        fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
 946        if (!fpi->phy_node && of_phy_is_fixed_link(ofdev->dev.of_node)) {
 947                err = of_phy_register_fixed_link(ofdev->dev.of_node);
 948                if (err)
 949                        goto out_free_fpi;
 950
 951                /* In the case of a fixed PHY, the DT node associated
 952                 * to the PHY is the Ethernet MAC DT node.
 953                 */
 954                fpi->phy_node = of_node_get(ofdev->dev.of_node);
 955        }
 956
 957        if (of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc5125-fec")) {
 958                phy_connection_type = of_get_property(ofdev->dev.of_node,
 959                                                "phy-connection-type", NULL);
 960                if (phy_connection_type && !strcmp("rmii", phy_connection_type))
 961                        fpi->use_rmii = 1;
 962        }
 963
 964        /* make clock lookup non-fatal (the driver is shared among platforms),
 965         * but require enable to succeed when a clock was specified/found,
 966         * keep a reference to the clock upon successful acquisition
 967         */
 968        clk = devm_clk_get(&ofdev->dev, "per");
 969        if (!IS_ERR(clk)) {
 970                ret = clk_prepare_enable(clk);
 971                if (ret)
 972                        goto out_deregister_fixed_link;
 973
 974                fpi->clk_per = clk;
 975        }
 976
 977        privsize = sizeof(*fep) +
 978                   sizeof(struct sk_buff **) *
 979                     (fpi->rx_ring + fpi->tx_ring) +
 980                   sizeof(char) * fpi->tx_ring;
 981
 982        ndev = alloc_etherdev(privsize);
 983        if (!ndev) {
 984                ret = -ENOMEM;
 985                goto out_put;
 986        }
 987
 988        SET_NETDEV_DEV(ndev, &ofdev->dev);
 989        platform_set_drvdata(ofdev, ndev);
 990
 991        fep = netdev_priv(ndev);
 992        fep->dev = &ofdev->dev;
 993        fep->ndev = ndev;
 994        fep->fpi = fpi;
 995        fep->ops = match->data;
 996
 997        ret = fep->ops->setup_data(ndev);
 998        if (ret)
 999                goto out_free_dev;
1000
1001        fep->rx_skbuff = (struct sk_buff **)&fep[1];
1002        fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1003        fep->mapped_as_page = (char *)(fep->rx_skbuff + fpi->rx_ring +
1004                                       fpi->tx_ring);
1005
1006        spin_lock_init(&fep->lock);
1007        spin_lock_init(&fep->tx_lock);
1008
1009        mac_addr = of_get_mac_address(ofdev->dev.of_node);
1010        if (!IS_ERR(mac_addr))
1011                ether_addr_copy(ndev->dev_addr, mac_addr);
1012
1013        ret = fep->ops->allocate_bd(ndev);
1014        if (ret)
1015                goto out_cleanup_data;
1016
1017        fep->rx_bd_base = fep->ring_base;
1018        fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1019
1020        fep->tx_ring = fpi->tx_ring;
1021        fep->rx_ring = fpi->rx_ring;
1022
1023        ndev->netdev_ops = &fs_enet_netdev_ops;
1024        ndev->watchdog_timeo = 2 * HZ;
1025        INIT_WORK(&fep->timeout_work, fs_timeout_work);
1026        netif_napi_add(ndev, &fep->napi, fs_enet_napi, fpi->napi_weight);
1027
1028        ndev->ethtool_ops = &fs_ethtool_ops;
1029
1030        netif_carrier_off(ndev);
1031
1032        ndev->features |= NETIF_F_SG;
1033
1034        ret = register_netdev(ndev);
1035        if (ret)
1036                goto out_free_bd;
1037
1038        pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
1039
1040        return 0;
1041
1042out_free_bd:
1043        fep->ops->free_bd(ndev);
1044out_cleanup_data:
1045        fep->ops->cleanup_data(ndev);
1046out_free_dev:
1047        free_netdev(ndev);
1048out_put:
1049        clk_disable_unprepare(fpi->clk_per);
1050out_deregister_fixed_link:
1051        of_node_put(fpi->phy_node);
1052        if (of_phy_is_fixed_link(ofdev->dev.of_node))
1053                of_phy_deregister_fixed_link(ofdev->dev.of_node);
1054out_free_fpi:
1055        kfree(fpi);
1056        return ret;
1057}
1058
1059static int fs_enet_remove(struct platform_device *ofdev)
1060{
1061        struct net_device *ndev = platform_get_drvdata(ofdev);
1062        struct fs_enet_private *fep = netdev_priv(ndev);
1063
1064        unregister_netdev(ndev);
1065
1066        fep->ops->free_bd(ndev);
1067        fep->ops->cleanup_data(ndev);
1068        dev_set_drvdata(fep->dev, NULL);
1069        of_node_put(fep->fpi->phy_node);
1070        clk_disable_unprepare(fep->fpi->clk_per);
1071        if (of_phy_is_fixed_link(ofdev->dev.of_node))
1072                of_phy_deregister_fixed_link(ofdev->dev.of_node);
1073        free_netdev(ndev);
1074        return 0;
1075}
1076
1077static const struct of_device_id fs_enet_match[] = {
1078#ifdef CONFIG_FS_ENET_HAS_SCC
1079        {
1080                .compatible = "fsl,cpm1-scc-enet",
1081                .data = (void *)&fs_scc_ops,
1082        },
1083        {
1084                .compatible = "fsl,cpm2-scc-enet",
1085                .data = (void *)&fs_scc_ops,
1086        },
1087#endif
1088#ifdef CONFIG_FS_ENET_HAS_FCC
1089        {
1090                .compatible = "fsl,cpm2-fcc-enet",
1091                .data = (void *)&fs_fcc_ops,
1092        },
1093#endif
1094#ifdef CONFIG_FS_ENET_HAS_FEC
1095#ifdef CONFIG_FS_ENET_MPC5121_FEC
1096        {
1097                .compatible = "fsl,mpc5121-fec",
1098                .data = (void *)&fs_fec_ops,
1099        },
1100        {
1101                .compatible = "fsl,mpc5125-fec",
1102                .data = (void *)&fs_fec_ops,
1103        },
1104#else
1105        {
1106                .compatible = "fsl,pq1-fec-enet",
1107                .data = (void *)&fs_fec_ops,
1108        },
1109#endif
1110#endif
1111        {}
1112};
1113MODULE_DEVICE_TABLE(of, fs_enet_match);
1114
1115static struct platform_driver fs_enet_driver = {
1116        .driver = {
1117                .name = "fs_enet",
1118                .of_match_table = fs_enet_match,
1119        },
1120        .probe = fs_enet_probe,
1121        .remove = fs_enet_remove,
1122};
1123
1124#ifdef CONFIG_NET_POLL_CONTROLLER
1125static void fs_enet_netpoll(struct net_device *dev)
1126{
1127       disable_irq(dev->irq);
1128       fs_enet_interrupt(dev->irq, dev);
1129       enable_irq(dev->irq);
1130}
1131#endif
1132
1133module_platform_driver(fs_enet_driver);
1134