drivers/net/fec_mpc52xx.c

   1 /*
   2  * Driver for the MPC5200 Fast Ethernet Controller
   3  *
   4  * Originally written by Dale Farnsworth <dfarnsworth@mvista.com> and
   5  * now maintained by Sylvain Munaut <tnt@246tNt.com>
   6  *
   7  * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
   8  * Copyright (C) 2007  Sylvain Munaut <tnt@246tNt.com>
   9  * Copyright (C) 2003-2004  MontaVista, Software, Inc.
  10  *
  11  * This file is licensed under the terms of the GNU General Public License
  12  * version 2. This program is licensed "as is" without any warranty of any
  13  * kind, whether express or implied.
  14  *
  15  */
  16
  17 #include <linux/module.h>
  18
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/slab.h>
  23 #include <linux/errno.h>
  24 #include <linux/init.h>
  25 #include <linux/crc32.h>
  26 #include <linux/hardirq.h>
  27 #include <linux/delay.h>
  28 #include <linux/of_device.h>
  29 #include <linux/of_mdio.h>
  30 #include <linux/of_platform.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/skbuff.h>
  36
  37 #include <asm/io.h>
  38 #include <asm/delay.h>
  39 #include <asm/mpc52xx.h>
  40
  41 #include <sysdev/bestcomm/bestcomm.h>
  42 #include <sysdev/bestcomm/fec.h>
  43
  44 #include "fec_mpc52xx.h"
  45
  46 #define DRIVER_NAME "mpc52xx-fec"
  47
  48 /* Private driver data structure */
  49 struct mpc52xx_fec_priv {
  50         struct net_device *ndev;
  51         int duplex;
  52         int speed;
  53         int r_irq;
  54         int t_irq;
  55         struct mpc52xx_fec __iomem *fec;
  56         struct bcom_task *rx_dmatsk;
  57         struct bcom_task *tx_dmatsk;
  58         spinlock_t lock;
  59         int msg_enable;
  60
  61         /* MDIO link details */
  62         unsigned int mdio_speed;
  63         struct device_node *phy_node;
  64         struct phy_device *phydev;
  65         enum phy_state link;
  66         int seven_wire_mode;
  67 };
  68
  69
  70 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
  71 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
  72 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
  73 static void mpc52xx_fec_stop(struct net_device *dev);
  74 static void mpc52xx_fec_start(struct net_device *dev);
  75 static void mpc52xx_fec_reset(struct net_device *dev);
  76
  77 static u8 mpc52xx_fec_mac_addr[6];
  78 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
  79 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
  80
  81 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
  82                 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
  83 static int debug = -1;  /* the above default */
  84 module_param(debug, int, 0);
  85 MODULE_PARM_DESC(debug, "debugging messages level");
  86
  87 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
  88 {
  89         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
  90         unsigned long flags;
  91
  92         dev_warn(&dev->dev, "transmit timed out\n");
  93
  94         spin_lock_irqsave(&priv->lock, flags);
  95         mpc52xx_fec_reset(dev);
  96         dev->stats.tx_errors++;
  97         spin_unlock_irqrestore(&priv->lock, flags);
  98
  99         netif_wake_queue(dev);
 100 }
 101
 102 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
 103 {
 104         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 105         struct mpc52xx_fec __iomem *fec = priv->fec;
 106
 107         out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
 108         out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
 109 }
 110
 111 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
 112 {
 113         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 114         struct mpc52xx_fec __iomem *fec = priv->fec;
 115
 116         *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
 117         *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
 118 }
 119
 120 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
 121 {
 122         struct sockaddr *sock = addr;
 123
 124         memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
 125
 126         mpc52xx_fec_set_paddr(dev, sock->sa_data);
 127         return 0;
 128 }
 129
 130 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
 131 {
 132         while (!bcom_queue_empty(s)) {
 133                 struct bcom_fec_bd *bd;
 134                 struct sk_buff *skb;
 135
 136                 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
 137                 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
 138                                  DMA_FROM_DEVICE);
 139                 kfree_skb(skb);
 140         }
 141 }
 142
 143 static void
 144 mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
 145 {
 146         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 147         struct bcom_fec_bd *bd;
 148
 149         bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
 150         bd->status = FEC_RX_BUFFER_SIZE;
 151         bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
 152                                     FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 153         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
 154 }
 155
 156 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
 157 {
 158         struct sk_buff *skb;
 159
 160         while (!bcom_queue_full(rxtsk)) {
 161                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 162                 if (!skb)
 163                         return -EAGAIN;
 164
 165                 /* zero out the initial receive buffers to aid debugging */
 166                 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
 167                 mpc52xx_fec_rx_submit(dev, skb);
 168         }
 169         return 0;
 170 }
 171
 172 /* based on generic_adjust_link from fs_enet-main.c */
 173 static void mpc52xx_fec_adjust_link(struct net_device *dev)
 174 {
 175         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 176         struct phy_device *phydev = priv->phydev;
 177         int new_state = 0;
 178
 179         if (phydev->link != PHY_DOWN) {
 180                 if (phydev->duplex != priv->duplex) {
 181                         struct mpc52xx_fec __iomem *fec = priv->fec;
 182                         u32 rcntrl;
 183                         u32 tcntrl;
 184
 185                         new_state = 1;
 186                         priv->duplex = phydev->duplex;
 187
 188                         rcntrl = in_be32(&fec->r_cntrl);
 189                         tcntrl = in_be32(&fec->x_cntrl);
 190
 191                         rcntrl &= ~FEC_RCNTRL_DRT;
 192                         tcntrl &= ~FEC_TCNTRL_FDEN;
 193                         if (phydev->duplex == DUPLEX_FULL)
 194                                 tcntrl |= FEC_TCNTRL_FDEN;      /* FD enable */
 195                         else
 196                                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 197
 198                         out_be32(&fec->r_cntrl, rcntrl);
 199                         out_be32(&fec->x_cntrl, tcntrl);
 200                 }
 201
 202                 if (phydev->speed != priv->speed) {
 203                         new_state = 1;
 204                         priv->speed = phydev->speed;
 205                 }
 206
 207                 if (priv->link == PHY_DOWN) {
 208                         new_state = 1;
 209                         priv->link = phydev->link;
 210                 }
 211
 212         } else if (priv->link) {
 213                 new_state = 1;
 214                 priv->link = PHY_DOWN;
 215                 priv->speed = 0;
 216                 priv->duplex = -1;
 217         }
 218
 219         if (new_state && netif_msg_link(priv))
 220                 phy_print_status(phydev);
 221 }
 222
 223 static int mpc52xx_fec_open(struct net_device *dev)
 224 {
 225         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 226         int err = -EBUSY;
 227
 228         if (priv->phy_node) {
 229                 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
 230                                               mpc52xx_fec_adjust_link, 0, 0);
 231                 if (!priv->phydev) {
 232                         dev_err(&dev->dev, "of_phy_connect failed\n");
 233                         return -ENODEV;
 234                 }
 235                 phy_start(priv->phydev);
 236         }
 237
 238         if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
 239                         DRIVER_NAME "_ctrl", dev)) {
 240                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
 241                 goto free_phy;
 242         }
 243         if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
 244                         DRIVER_NAME "_rx", dev)) {
 245                 dev_err(&dev->dev, "rx interrupt request failed\n");
 246                 goto free_ctrl_irq;
 247         }
 248         if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
 249                         DRIVER_NAME "_tx", dev)) {
 250                 dev_err(&dev->dev, "tx interrupt request failed\n");
 251                 goto free_2irqs;
 252         }
 253
 254         bcom_fec_rx_reset(priv->rx_dmatsk);
 255         bcom_fec_tx_reset(priv->tx_dmatsk);
 256
 257         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 258         if (err) {
 259                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
 260                 goto free_irqs;
 261         }
 262
 263         bcom_enable(priv->rx_dmatsk);
 264         bcom_enable(priv->tx_dmatsk);
 265
 266         mpc52xx_fec_start(dev);
 267
 268         netif_start_queue(dev);
 269
 270         return 0;
 271
 272  free_irqs:
 273         free_irq(priv->t_irq, dev);
 274  free_2irqs:
 275         free_irq(priv->r_irq, dev);
 276  free_ctrl_irq:
 277         free_irq(dev->irq, dev);
 278  free_phy:
 279         if (priv->phydev) {
 280                 phy_stop(priv->phydev);
 281                 phy_disconnect(priv->phydev);
 282                 priv->phydev = NULL;
 283         }
 284
 285         return err;
 286 }
 287
 288 static int mpc52xx_fec_close(struct net_device *dev)
 289 {
 290         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 291
 292         netif_stop_queue(dev);
 293
 294         mpc52xx_fec_stop(dev);
 295
 296         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 297
 298         free_irq(dev->irq, dev);
 299         free_irq(priv->r_irq, dev);
 300         free_irq(priv->t_irq, dev);
 301
 302         if (priv->phydev) {
 303                 /* power down phy */
 304                 phy_stop(priv->phydev);
 305                 phy_disconnect(priv->phydev);
 306                 priv->phydev = NULL;
 307         }
 308
 309         return 0;
 310 }
 311
 312 /* This will only be invoked if your driver is _not_ in XOFF state.
 313  * What this means is that you need not check it, and that this
 314  * invariant will hold if you make sure that the netif_*_queue()
 315  * calls are done at the proper times.
 316  */
 317 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 318 {
 319         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 320         struct bcom_fec_bd *bd;
 321         unsigned long flags;
 322
 323         if (bcom_queue_full(priv->tx_dmatsk)) {
 324                 if (net_ratelimit())
 325                         dev_err(&dev->dev, "transmit queue overrun\n");
 326                 return NETDEV_TX_BUSY;
 327         }
 328
 329         spin_lock_irqsave(&priv->lock, flags);
 330
 331         bd = (struct bcom_fec_bd *)
 332                 bcom_prepare_next_buffer(priv->tx_dmatsk);
 333
 334         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
 335         bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
 336                                     DMA_TO_DEVICE);
 337
 338         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
 339         spin_unlock_irqrestore(&priv->lock, flags);
 340
 341         if (bcom_queue_full(priv->tx_dmatsk)) {
 342                 netif_stop_queue(dev);
 343         }
 344
 345         return NETDEV_TX_OK;
 346 }
 347
 348 #ifdef CONFIG_NET_POLL_CONTROLLER
 349 static void mpc52xx_fec_poll_controller(struct net_device *dev)
 350 {
 351         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 352
 353         disable_irq(priv->t_irq);
 354         mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
 355         enable_irq(priv->t_irq);
 356         disable_irq(priv->r_irq);
 357         mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
 358         enable_irq(priv->r_irq);
 359 }
 360 #endif
 361
 362
 363 /* This handles BestComm transmit task interrupts
 364  */
 365 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
 366 {
 367         struct net_device *dev = dev_id;
 368         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 369         unsigned long flags;
 370
 371         spin_lock_irqsave(&priv->lock, flags);
 372         while (bcom_buffer_done(priv->tx_dmatsk)) {
 373                 struct sk_buff *skb;
 374                 struct bcom_fec_bd *bd;
 375                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
 376                                 (struct bcom_bd **)&bd);
 377                 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
 378                                  DMA_TO_DEVICE);
 379
 380                 dev_kfree_skb_irq(skb);
 381         }
 382         spin_unlock_irqrestore(&priv->lock, flags);
 383
 384         netif_wake_queue(dev);
 385
 386         return IRQ_HANDLED;
 387 }
 388
 389 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
 390 {
 391         struct net_device *dev = dev_id;
 392         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 393         struct sk_buff *rskb; /* received sk_buff */
 394         struct sk_buff *skb;  /* new sk_buff to enqueue in its place */
 395         struct bcom_fec_bd *bd;
 396         u32 status, physaddr;
 397         int length;
 398         unsigned long flags;
 399
 400         spin_lock_irqsave(&priv->lock, flags);
 401
 402         while (bcom_buffer_done(priv->rx_dmatsk)) {
 403
 404                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
 405                                             (struct bcom_bd **)&bd);
 406                 physaddr = bd->skb_pa;
 407
 408                 /* Test for errors in received frame */
 409                 if (status & BCOM_FEC_RX_BD_ERRORS) {
 410                         /* Drop packet and reuse the buffer */
 411                         mpc52xx_fec_rx_submit(dev, rskb);
 412                         dev->stats.rx_dropped++;
 413                         continue;
 414                 }
 415
 416                 /* skbs are allocated on open, so now we allocate a new one,
 417                  * and remove the old (with the packet) */
 418                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 419                 if (!skb) {
 420                         /* Can't get a new one : reuse the same & drop pkt */
 421                         dev_notice(&dev->dev, "Low memory - dropped packet.\n");
 422                         mpc52xx_fec_rx_submit(dev, rskb);
 423                         dev->stats.rx_dropped++;
 424                         continue;
 425                 }
 426
 427                 /* Enqueue the new sk_buff back on the hardware */
 428                 mpc52xx_fec_rx_submit(dev, skb);
 429
 430                 /* Process the received skb - Drop the spin lock while
 431                  * calling into the network stack */
 432                 spin_unlock_irqrestore(&priv->lock, flags);
 433
 434                 dma_unmap_single(dev->dev.parent, physaddr, rskb->len,
 435                                  DMA_FROM_DEVICE);
 436                 length = status & BCOM_FEC_RX_BD_LEN_MASK;
 437                 skb_put(rskb, length - 4);      /* length without CRC32 */
 438                 rskb->protocol = eth_type_trans(rskb, dev);
 439                 netif_rx(rskb);
 440
 441                 spin_lock_irqsave(&priv->lock, flags);
 442         }
 443
 444         spin_unlock_irqrestore(&priv->lock, flags);
 445
 446         return IRQ_HANDLED;
 447 }
 448
 449 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
 450 {
 451         struct net_device *dev = dev_id;
 452         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 453         struct mpc52xx_fec __iomem *fec = priv->fec;
 454         u32 ievent;
 455         unsigned long flags;
 456
 457         ievent = in_be32(&fec->ievent);
 458
 459         ievent &= ~FEC_IEVENT_MII;      /* mii is handled separately */
 460         if (!ievent)
 461                 return IRQ_NONE;
 462
 463         out_be32(&fec->ievent, ievent);         /* clear pending events */
 464
 465         /* on fifo error, soft-reset fec */
 466         if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
 467
 468                 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
 469                         dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
 470                 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
 471                         dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
 472
 473                 spin_lock_irqsave(&priv->lock, flags);
 474                 mpc52xx_fec_reset(dev);
 475                 spin_unlock_irqrestore(&priv->lock, flags);
 476
 477                 return IRQ_HANDLED;
 478         }
 479
 480         if (ievent & ~FEC_IEVENT_TFINT)
 481                 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
 482
 483         return IRQ_HANDLED;
 484 }
 485
 486 /*
 487  * Get the current statistics.
 488  * This may be called with the card open or closed.
 489  */
 490 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
 491 {
 492         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 493         struct net_device_stats *stats = &dev->stats;
 494         struct mpc52xx_fec __iomem *fec = priv->fec;
 495
 496         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
 497         stats->rx_packets = in_be32(&fec->rmon_r_packets);
 498         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
 499                 in_be32(&fec->rmon_r_undersize) +
 500                 in_be32(&fec->rmon_r_oversize) +
 501                 in_be32(&fec->rmon_r_frag) +
 502                 in_be32(&fec->rmon_r_jab);
 503
 504         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
 505         stats->tx_packets = in_be32(&fec->rmon_t_packets);
 506         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
 507                 in_be32(&fec->rmon_t_undersize) +
 508                 in_be32(&fec->rmon_t_oversize) +
 509                 in_be32(&fec->rmon_t_frag) +
 510                 in_be32(&fec->rmon_t_jab);
 511
 512         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
 513         stats->collisions = in_be32(&fec->rmon_t_col);
 514
 515         /* detailed rx_errors: */
 516         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
 517                                         + in_be32(&fec->rmon_r_oversize)
 518                                         + in_be32(&fec->rmon_r_frag)
 519                                         + in_be32(&fec->rmon_r_jab);
 520         stats->rx_over_errors = in_be32(&fec->r_macerr);
 521         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
 522         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
 523         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
 524         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
 525
 526         /* detailed tx_errors: */
 527         stats->tx_aborted_errors = 0;
 528         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
 529         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
 530         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
 531         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
 532
 533         return stats;
 534 }
 535
 536 /*
 537  * Read MIB counters in order to reset them,
 538  * then zero all the stats fields in memory
 539  */
 540 static void mpc52xx_fec_reset_stats(struct net_device *dev)
 541 {
 542         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 543         struct mpc52xx_fec __iomem *fec = priv->fec;
 544
 545         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
 546         memset_io(&fec->rmon_t_drop, 0,
 547                    offsetof(struct mpc52xx_fec, reserved10) -
 548                    offsetof(struct mpc52xx_fec, rmon_t_drop));
 549         out_be32(&fec->mib_control, 0);
 550
 551         memset(&dev->stats, 0, sizeof(dev->stats));
 552 }
 553
 554 /*
 555  * Set or clear the multicast filter for this adaptor.
 556  */
 557 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
 558 {
 559         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 560         struct mpc52xx_fec __iomem *fec = priv->fec;
 561         u32 rx_control;
 562
 563         rx_control = in_be32(&fec->r_cntrl);
 564
 565         if (dev->flags & IFF_PROMISC) {
 566                 rx_control |= FEC_RCNTRL_PROM;
 567                 out_be32(&fec->r_cntrl, rx_control);
 568         } else {
 569                 rx_control &= ~FEC_RCNTRL_PROM;
 570                 out_be32(&fec->r_cntrl, rx_control);
 571
 572                 if (dev->flags & IFF_ALLMULTI) {
 573                         out_be32(&fec->gaddr1, 0xffffffff);
 574                         out_be32(&fec->gaddr2, 0xffffffff);
 575                 } else {
 576                         u32 crc;
 577                         struct netdev_hw_addr *ha;
 578                         u32 gaddr1 = 0x00000000;
 579                         u32 gaddr2 = 0x00000000;
 580
 581                         netdev_for_each_mc_addr(ha, dev) {
 582                                 crc = ether_crc_le(6, ha->addr) >> 26;
 583                                 if (crc >= 32)
 584                                         gaddr1 |= 1 << (crc-32);
 585                                 else
 586                                         gaddr2 |= 1 << crc;
 587                         }
 588                         out_be32(&fec->gaddr1, gaddr1);
 589                         out_be32(&fec->gaddr2, gaddr2);
 590                 }
 591         }
 592 }
 593
 594 /**
 595  * mpc52xx_fec_hw_init
 596  * @dev: network device
 597  *
 598  * Setup various hardware setting, only needed once on start
 599  */
 600 static void mpc52xx_fec_hw_init(struct net_device *dev)
 601 {
 602         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 603         struct mpc52xx_fec __iomem *fec = priv->fec;
 604         int i;
 605
 606         /* Whack a reset.  We should wait for this. */
 607         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
 608         for (i = 0; i < FEC_RESET_DELAY; ++i) {
 609                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
 610                         break;
 611                 udelay(1);
 612         }
 613         if (i == FEC_RESET_DELAY)
 614                 dev_err(&dev->dev, "FEC Reset timeout!\n");
 615
 616         /* set pause to 0x20 frames */
 617         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
 618
 619         /* high service request will be deasserted when there's < 7 bytes in fifo
 620          * low service request will be deasserted when there's < 4*7 bytes in fifo
 621          */
 622         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 623         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 624
 625         /* alarm when <= x bytes in FIFO */
 626         out_be32(&fec->rfifo_alarm, 0x0000030c);
 627         out_be32(&fec->tfifo_alarm, 0x00000100);
 628
 629         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
 630         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
 631
 632         /* enable crc generation */
 633         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
 634         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
 635         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
 636
 637         /* set phy speed.
 638          * this can't be done in phy driver, since it needs to be called
 639          * before fec stuff (even on resume) */
 640         out_be32(&fec->mii_speed, priv->mdio_speed);
 641 }
 642
 643 /**
 644  * mpc52xx_fec_start
 645  * @dev: network device
 646  *
 647  * This function is called to start or restart the FEC during a link
 648  * change.  This happens on fifo errors or when switching between half
 649  * and full duplex.
 650  */
 651 static void mpc52xx_fec_start(struct net_device *dev)
 652 {
 653         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 654         struct mpc52xx_fec __iomem *fec = priv->fec;
 655         u32 rcntrl;
 656         u32 tcntrl;
 657         u32 tmp;
 658
 659         /* clear sticky error bits */
 660         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
 661         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
 662         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
 663
 664         /* FIFOs will reset on mpc52xx_fec_enable */
 665         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
 666
 667         /* Set station address. */
 668         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
 669
 670         mpc52xx_fec_set_multicast_list(dev);
 671
 672         /* set max frame len, enable flow control, select mii mode */
 673         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
 674         rcntrl |= FEC_RCNTRL_FCE;
 675
 676         if (!priv->seven_wire_mode)
 677                 rcntrl |= FEC_RCNTRL_MII_MODE;
 678
 679         if (priv->duplex == DUPLEX_FULL)
 680                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
 681         else {
 682                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 683                 tcntrl = 0;
 684         }
 685         out_be32(&fec->r_cntrl, rcntrl);
 686         out_be32(&fec->x_cntrl, tcntrl);
 687
 688         /* Clear any outstanding interrupt. */
 689         out_be32(&fec->ievent, 0xffffffff);
 690
 691         /* Enable interrupts we wish to service. */
 692         out_be32(&fec->imask, FEC_IMASK_ENABLE);
 693
 694         /* And last, enable the transmit and receive processing. */
 695         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
 696         out_be32(&fec->r_des_active, 0x01000000);
 697 }
 698
 699 /**
 700  * mpc52xx_fec_stop
 701  * @dev: network device
 702  *
 703  * stop all activity on fec and empty dma buffers
 704  */
 705 static void mpc52xx_fec_stop(struct net_device *dev)
 706 {
 707         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 708         struct mpc52xx_fec __iomem *fec = priv->fec;
 709         unsigned long timeout;
 710
 711         /* disable all interrupts */
 712         out_be32(&fec->imask, 0);
 713
 714         /* Disable the rx task. */
 715         bcom_disable(priv->rx_dmatsk);
 716
 717         /* Wait for tx queue to drain, but only if we're in process context */
 718         if (!in_interrupt()) {
 719                 timeout = jiffies + msecs_to_jiffies(2000);
 720                 while (time_before(jiffies, timeout) &&
 721                                 !bcom_queue_empty(priv->tx_dmatsk))
 722                         msleep(100);
 723
 724                 if (time_after_eq(jiffies, timeout))
 725                         dev_err(&dev->dev, "queues didn't drain\n");
 726 #if 1
 727                 if (time_after_eq(jiffies, timeout)) {
 728                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
 729                                         priv->tx_dmatsk->index,
 730                                         priv->tx_dmatsk->outdex);
 731                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
 732                                         priv->rx_dmatsk->index,
 733                                         priv->rx_dmatsk->outdex);
 734                 }
 735 #endif
 736         }
 737
 738         bcom_disable(priv->tx_dmatsk);
 739
 740         /* Stop FEC */
 741         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
 742 }
 743
 744 /* reset fec and bestcomm tasks */
 745 static void mpc52xx_fec_reset(struct net_device *dev)
 746 {
 747         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 748         struct mpc52xx_fec __iomem *fec = priv->fec;
 749
 750         mpc52xx_fec_stop(dev);
 751
 752         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
 753         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
 754
 755         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 756
 757         mpc52xx_fec_hw_init(dev);
 758
 759         bcom_fec_rx_reset(priv->rx_dmatsk);
 760         bcom_fec_tx_reset(priv->tx_dmatsk);
 761
 762         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 763
 764         bcom_enable(priv->rx_dmatsk);
 765         bcom_enable(priv->tx_dmatsk);
 766
 767         mpc52xx_fec_start(dev);
 768
 769         netif_wake_queue(dev);
 770 }
 771
 772
 773 /* ethtool interface */
 774
 775 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 776 {
 777         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 778
 779         if (!priv->phydev)
 780                 return -ENODEV;
 781
 782         return phy_ethtool_gset(priv->phydev, cmd);
 783 }
 784
 785 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 786 {
 787         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 788
 789         if (!priv->phydev)
 790                 return -ENODEV;
 791
 792         return phy_ethtool_sset(priv->phydev, cmd);
 793 }
 794
 795 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
 796 {
 797         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 798         return priv->msg_enable;
 799 }
 800
 801 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
 802 {
 803         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 804         priv->msg_enable = level;
 805 }
 806
 807 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
 808         .get_settings = mpc52xx_fec_get_settings,
 809         .set_settings = mpc52xx_fec_set_settings,
 810         .get_link = ethtool_op_get_link,
 811         .get_msglevel = mpc52xx_fec_get_msglevel,
 812         .set_msglevel = mpc52xx_fec_set_msglevel,
 813 };
 814
 815
 816 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 817 {
 818         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 819
 820         if (!priv->phydev)
 821                 return -ENOTSUPP;
 822
 823         return phy_mii_ioctl(priv->phydev, rq, cmd);
 824 }
 825
 826 static const struct net_device_ops mpc52xx_fec_netdev_ops = {
 827         .ndo_open = mpc52xx_fec_open,
 828         .ndo_stop = mpc52xx_fec_close,
 829         .ndo_start_xmit = mpc52xx_fec_start_xmit,
 830         .ndo_set_multicast_list = mpc52xx_fec_set_multicast_list,
 831         .ndo_set_mac_address = mpc52xx_fec_set_mac_address,
 832         .ndo_validate_addr = eth_validate_addr,
 833         .ndo_do_ioctl = mpc52xx_fec_ioctl,
 834         .ndo_change_mtu = eth_change_mtu,
 835         .ndo_tx_timeout = mpc52xx_fec_tx_timeout,
 836         .ndo_get_stats = mpc52xx_fec_get_stats,
 837 #ifdef CONFIG_NET_POLL_CONTROLLER
 838         .ndo_poll_controller = mpc52xx_fec_poll_controller,
 839 #endif
 840 };
 841
 842 /* ======================================================================== */
 843 /* OF Driver                                                                */
 844 /* ======================================================================== */
 845
 846 static int __devinit
 847 mpc52xx_fec_probe(struct platform_device *op, const struct of_device_id *match)
 848 {
 849         int rv;
 850         struct net_device *ndev;
 851         struct mpc52xx_fec_priv *priv = NULL;
 852         struct resource mem;
 853         const u32 *prop;
 854         int prop_size;
 855
 856         phys_addr_t rx_fifo;
 857         phys_addr_t tx_fifo;
 858
 859         /* Get the ether ndev & it's private zone */
 860         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
 861         if (!ndev)
 862                 return -ENOMEM;
 863
 864         priv = netdev_priv(ndev);
 865         priv->ndev = ndev;
 866
 867         /* Reserve FEC control zone */
 868         rv = of_address_to_resource(op->dev.of_node, 0, &mem);
 869         if (rv) {
 870                 printk(KERN_ERR DRIVER_NAME ": "
 871                                 "Error while parsing device node resource\n" );
 872                 goto err_netdev;
 873         }
 874         if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
 875                 printk(KERN_ERR DRIVER_NAME
 876                         " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
 877                         (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
 878                 rv = -EINVAL;
 879                 goto err_netdev;
 880         }
 881
 882         if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec),
 883                                 DRIVER_NAME)) {
 884                 rv = -EBUSY;
 885                 goto err_netdev;
 886         }
 887
 888         /* Init ether ndev with what we have */
 889         ndev->netdev_ops        = &mpc52xx_fec_netdev_ops;
 890         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
 891         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
 892         ndev->base_addr         = mem.start;
 893         SET_NETDEV_DEV(ndev, &op->dev);
 894
 895         spin_lock_init(&priv->lock);
 896
 897         /* ioremap the zones */
 898         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
 899
 900         if (!priv->fec) {
 901                 rv = -ENOMEM;
 902                 goto err_mem_region;
 903         }
 904
 905         /* Bestcomm init */
 906         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
 907         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
 908
 909         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
 910         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
 911
 912         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
 913                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
 914                 rv = -ENOMEM;
 915                 goto err_rx_tx_dmatsk;
 916         }
 917
 918         /* Get the IRQ we need one by one */
 919                 /* Control */
 920         ndev->irq = irq_of_parse_and_map(op->dev.of_node, 0);
 921
 922                 /* RX */
 923         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
 924
 925                 /* TX */
 926         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
 927
 928         /* MAC address init */
 929         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
 930                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
 931         else
 932                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
 933
 934         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
 935
 936         /*
 937          * Link mode configuration
 938          */
 939
 940         /* Start with safe defaults for link connection */
 941         priv->speed = 100;
 942         priv->duplex = DUPLEX_HALF;
 943         priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->dev.of_node) >> 20) / 5) << 1;
 944
 945         /* The current speed preconfigures the speed of the MII link */
 946         prop = of_get_property(op->dev.of_node, "current-speed", &prop_size);
 947         if (prop && (prop_size >= sizeof(u32) * 2)) {
 948                 priv->speed = prop[0];
 949                 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
 950         }
 951
 952         /* If there is a phy handle, then get the PHY node */
 953         priv->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
 954
 955         /* the 7-wire property means don't use MII mode */
 956         if (of_find_property(op->dev.of_node, "fsl,7-wire-mode", NULL)) {
 957                 priv->seven_wire_mode = 1;
 958                 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
 959         }
 960
 961         /* Hardware init */
 962         mpc52xx_fec_hw_init(ndev);
 963         mpc52xx_fec_reset_stats(ndev);
 964
 965         rv = register_netdev(ndev);
 966         if (rv < 0)
 967                 goto err_node;
 968
 969         /* We're done ! */
 970         dev_set_drvdata(&op->dev, ndev);
 971
 972         return 0;
 973
 974 err_node:
 975         of_node_put(priv->phy_node);
 976         irq_dispose_mapping(ndev->irq);
 977 err_rx_tx_dmatsk:
 978         if (priv->rx_dmatsk)
 979                 bcom_fec_rx_release(priv->rx_dmatsk);
 980         if (priv->tx_dmatsk)
 981                 bcom_fec_tx_release(priv->tx_dmatsk);
 982         iounmap(priv->fec);
 983 err_mem_region:
 984         release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
 985 err_netdev:
 986         free_netdev(ndev);
 987
 988         return rv;
 989 }
 990
 991 static int
 992 mpc52xx_fec_remove(struct platform_device *op)
 993 {
 994         struct net_device *ndev;
 995         struct mpc52xx_fec_priv *priv;
 996
 997         ndev = dev_get_drvdata(&op->dev);
 998         priv = netdev_priv(ndev);
 999
1000         unregister_netdev(ndev);
1001
1002         if (priv->phy_node)
1003                 of_node_put(priv->phy_node);
1004         priv->phy_node = NULL;
1005
1006         irq_dispose_mapping(ndev->irq);
1007
1008         bcom_fec_rx_release(priv->rx_dmatsk);
1009         bcom_fec_tx_release(priv->tx_dmatsk);
1010
1011         iounmap(priv->fec);
1012
1013         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1014
1015         free_netdev(ndev);
1016
1017         dev_set_drvdata(&op->dev, NULL);
1018         return 0;
1019 }
1020
1021 #ifdef CONFIG_PM
1022 static int mpc52xx_fec_of_suspend(struct platform_device *op, pm_message_t state)
1023 {
1024         struct net_device *dev = dev_get_drvdata(&op->dev);
1025
1026         if (netif_running(dev))
1027                 mpc52xx_fec_close(dev);
1028
1029         return 0;
1030 }
1031
1032 static int mpc52xx_fec_of_resume(struct platform_device *op)
1033 {
1034         struct net_device *dev = dev_get_drvdata(&op->dev);
1035
1036         mpc52xx_fec_hw_init(dev);
1037         mpc52xx_fec_reset_stats(dev);
1038
1039         if (netif_running(dev))
1040                 mpc52xx_fec_open(dev);
1041
1042         return 0;
1043 }
1044 #endif
1045
1046 static struct of_device_id mpc52xx_fec_match[] = {
1047         { .compatible = "fsl,mpc5200b-fec", },
1048         { .compatible = "fsl,mpc5200-fec", },
1049         { .compatible = "mpc5200-fec", },
1050         { }
1051 };
1052
1053 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1054
1055 static struct of_platform_driver mpc52xx_fec_driver = {
1056         .driver = {
1057                 .name = DRIVER_NAME,
1058                 .owner = THIS_MODULE,
1059                 .of_match_table = mpc52xx_fec_match,
1060         },
1061         .probe          = mpc52xx_fec_probe,
1062         .remove         = mpc52xx_fec_remove,
1063 #ifdef CONFIG_PM
1064         .suspend        = mpc52xx_fec_of_suspend,
1065         .resume         = mpc52xx_fec_of_resume,
1066 #endif
1067 };
1068
1069
1070 /* ======================================================================== */
1071 /* Module                                                                   */
1072 /* ======================================================================== */
1073
1074 static int __init
1075 mpc52xx_fec_init(void)
1076 {
1077 #ifdef CONFIG_FEC_MPC52xx_MDIO
1078         int ret;
1079         ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1080         if (ret) {
1081                 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1082                 return ret;
1083         }
1084 #endif
1085         return of_register_platform_driver(&mpc52xx_fec_driver);
1086 }
1087
1088 static void __exit
1089 mpc52xx_fec_exit(void)
1090 {
1091         of_unregister_platform_driver(&mpc52xx_fec_driver);
1092 #ifdef CONFIG_FEC_MPC52xx_MDIO
1093         of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1094 #endif
1095 }
1096
1097
1098 module_init(mpc52xx_fec_init);
1099 module_exit(mpc52xx_fec_exit);
1100
1101 MODULE_LICENSE("GPL");
1102 MODULE_AUTHOR("Dale Farnsworth");
1103 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");