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/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/crc32.h>
  25 #include <linux/hardirq.h>
  26 #include <linux/delay.h>
  27 #include <linux/of_device.h>
  28 #include <linux/of_platform.h>
  29
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/skbuff.h>
  34
  35 #include <asm/io.h>
  36 #include <asm/delay.h>
  37 #include <asm/mpc52xx.h>
  38
  39 #include <sysdev/bestcomm/bestcomm.h>
  40 #include <sysdev/bestcomm/fec.h>
  41
  42 #include "fec_mpc52xx.h"
  43
  44 #define DRIVER_NAME "mpc52xx-fec"
  45
  46 #define FEC5200_PHYADDR_NONE    (-1)
  47 #define FEC5200_PHYADDR_7WIRE   (-2)
  48
  49 /* Private driver data structure */
  50 struct mpc52xx_fec_priv {
  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         int phy_addr;
  63         unsigned int phy_speed;
  64         struct phy_device *phydev;
  65         enum phy_state link;
  66 };
  67
  68
  69 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
  70 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
  71 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
  72 static void mpc52xx_fec_stop(struct net_device *dev);
  73 static void mpc52xx_fec_start(struct net_device *dev);
  74 static void mpc52xx_fec_reset(struct net_device *dev);
  75
  76 static u8 mpc52xx_fec_mac_addr[6];
  77 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
  78 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
  79
  80 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
  81                 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
  82 static int debug = -1;  /* the above default */
  83 module_param(debug, int, 0);
  84 MODULE_PARM_DESC(debug, "debugging messages level");
  85
  86 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
  87 {
  88         dev_warn(&dev->dev, "transmit timed out\n");
  89
  90         mpc52xx_fec_reset(dev);
  91
  92         dev->stats.tx_errors++;
  93
  94         netif_wake_queue(dev);
  95 }
  96
  97 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
  98 {
  99         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 100         struct mpc52xx_fec __iomem *fec = priv->fec;
 101
 102         out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
 103         out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
 104 }
 105
 106 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
 107 {
 108         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 109         struct mpc52xx_fec __iomem *fec = priv->fec;
 110
 111         *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
 112         *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
 113 }
 114
 115 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
 116 {
 117         struct sockaddr *sock = addr;
 118
 119         memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
 120
 121         mpc52xx_fec_set_paddr(dev, sock->sa_data);
 122         return 0;
 123 }
 124
 125 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
 126 {
 127         while (!bcom_queue_empty(s)) {
 128                 struct bcom_fec_bd *bd;
 129                 struct sk_buff *skb;
 130
 131                 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
 132                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
 133                 kfree_skb(skb);
 134         }
 135 }
 136
 137 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
 138 {
 139         while (!bcom_queue_full(rxtsk)) {
 140                 struct sk_buff *skb;
 141                 struct bcom_fec_bd *bd;
 142
 143                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 144                 if (skb == NULL)
 145                         return -EAGAIN;
 146
 147                 /* zero out the initial receive buffers to aid debugging */
 148                 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
 149
 150                 bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);
 151
 152                 bd->status = FEC_RX_BUFFER_SIZE;
 153                 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
 154                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 155
 156                 bcom_submit_next_buffer(rxtsk, skb);
 157         }
 158
 159         return 0;
 160 }
 161
 162 /* based on generic_adjust_link from fs_enet-main.c */
 163 static void mpc52xx_fec_adjust_link(struct net_device *dev)
 164 {
 165         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 166         struct phy_device *phydev = priv->phydev;
 167         int new_state = 0;
 168
 169         if (phydev->link != PHY_DOWN) {
 170                 if (phydev->duplex != priv->duplex) {
 171                         struct mpc52xx_fec __iomem *fec = priv->fec;
 172                         u32 rcntrl;
 173                         u32 tcntrl;
 174
 175                         new_state = 1;
 176                         priv->duplex = phydev->duplex;
 177
 178                         rcntrl = in_be32(&fec->r_cntrl);
 179                         tcntrl = in_be32(&fec->x_cntrl);
 180
 181                         rcntrl &= ~FEC_RCNTRL_DRT;
 182                         tcntrl &= ~FEC_TCNTRL_FDEN;
 183                         if (phydev->duplex == DUPLEX_FULL)
 184                                 tcntrl |= FEC_TCNTRL_FDEN;      /* FD enable */
 185                         else
 186                                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 187
 188                         out_be32(&fec->r_cntrl, rcntrl);
 189                         out_be32(&fec->x_cntrl, tcntrl);
 190                 }
 191
 192                 if (phydev->speed != priv->speed) {
 193                         new_state = 1;
 194                         priv->speed = phydev->speed;
 195                 }
 196
 197                 if (priv->link == PHY_DOWN) {
 198                         new_state = 1;
 199                         priv->link = phydev->link;
 200                 }
 201
 202         } else if (priv->link) {
 203                 new_state = 1;
 204                 priv->link = PHY_DOWN;
 205                 priv->speed = 0;
 206                 priv->duplex = -1;
 207         }
 208
 209         if (new_state && netif_msg_link(priv))
 210                 phy_print_status(phydev);
 211 }
 212
 213 static int mpc52xx_fec_init_phy(struct net_device *dev)
 214 {
 215         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 216         struct phy_device *phydev;
 217         char phy_id[BUS_ID_SIZE];
 218
 219         snprintf(phy_id, BUS_ID_SIZE, "%x:%02x",
 220                         (unsigned int)dev->base_addr, priv->phy_addr);
 221
 222         priv->link = PHY_DOWN;
 223         priv->speed = 0;
 224         priv->duplex = -1;
 225
 226         phydev = phy_connect(dev, phy_id, &mpc52xx_fec_adjust_link, 0, PHY_INTERFACE_MODE_MII);
 227         if (IS_ERR(phydev)) {
 228                 dev_err(&dev->dev, "phy_connect failed\n");
 229                 return PTR_ERR(phydev);
 230         }
 231         dev_info(&dev->dev, "attached phy %i to driver %s\n",
 232                         phydev->addr, phydev->drv->name);
 233
 234         priv->phydev = phydev;
 235
 236         return 0;
 237 }
 238
 239 static int mpc52xx_fec_phy_start(struct net_device *dev)
 240 {
 241         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 242         int err;
 243
 244         if (priv->phy_addr < 0)
 245                 return 0;
 246
 247         err = mpc52xx_fec_init_phy(dev);
 248         if (err) {
 249                 dev_err(&dev->dev, "mpc52xx_fec_init_phy failed\n");
 250                 return err;
 251         }
 252
 253         /* reset phy - this also wakes it from PDOWN */
 254         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
 255         phy_start(priv->phydev);
 256
 257         return 0;
 258 }
 259
 260 static void mpc52xx_fec_phy_stop(struct net_device *dev)
 261 {
 262         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 263
 264         if (!priv->phydev)
 265                 return;
 266
 267         phy_disconnect(priv->phydev);
 268         /* power down phy */
 269         phy_stop(priv->phydev);
 270         phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
 271 }
 272
 273 static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
 274                 struct mii_ioctl_data *mii_data, int cmd)
 275 {
 276         if (!priv->phydev)
 277                 return -ENOTSUPP;
 278
 279         return phy_mii_ioctl(priv->phydev, mii_data, cmd);
 280 }
 281
 282 static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
 283 {
 284         struct mpc52xx_fec __iomem *fec = priv->fec;
 285
 286         if (priv->phydev)
 287                 return;
 288
 289         out_be32(&fec->mii_speed, priv->phy_speed);
 290 }
 291
 292 static int mpc52xx_fec_open(struct net_device *dev)
 293 {
 294         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 295         int err = -EBUSY;
 296
 297         if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
 298                         DRIVER_NAME "_ctrl", dev)) {
 299                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
 300                 goto out;
 301         }
 302         if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
 303                         DRIVER_NAME "_rx", dev)) {
 304                 dev_err(&dev->dev, "rx interrupt request failed\n");
 305                 goto free_ctrl_irq;
 306         }
 307         if (request_irq(priv->t_irq, &mpc52xx_fec_tx_interrupt, 0,
 308                         DRIVER_NAME "_tx", dev)) {
 309                 dev_err(&dev->dev, "tx interrupt request failed\n");
 310                 goto free_2irqs;
 311         }
 312
 313         bcom_fec_rx_reset(priv->rx_dmatsk);
 314         bcom_fec_tx_reset(priv->tx_dmatsk);
 315
 316         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 317         if (err) {
 318                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
 319                 goto free_irqs;
 320         }
 321
 322         err = mpc52xx_fec_phy_start(dev);
 323         if (err)
 324                 goto free_skbs;
 325
 326         bcom_enable(priv->rx_dmatsk);
 327         bcom_enable(priv->tx_dmatsk);
 328
 329         mpc52xx_fec_start(dev);
 330
 331         netif_start_queue(dev);
 332
 333         return 0;
 334
 335  free_skbs:
 336         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 337
 338  free_irqs:
 339         free_irq(priv->t_irq, dev);
 340  free_2irqs:
 341         free_irq(priv->r_irq, dev);
 342  free_ctrl_irq:
 343         free_irq(dev->irq, dev);
 344  out:
 345
 346         return err;
 347 }
 348
 349 static int mpc52xx_fec_close(struct net_device *dev)
 350 {
 351         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 352
 353         netif_stop_queue(dev);
 354
 355         mpc52xx_fec_stop(dev);
 356
 357         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 358
 359         free_irq(dev->irq, dev);
 360         free_irq(priv->r_irq, dev);
 361         free_irq(priv->t_irq, dev);
 362
 363         mpc52xx_fec_phy_stop(dev);
 364
 365         return 0;
 366 }
 367
 368 /* This will only be invoked if your driver is _not_ in XOFF state.
 369  * What this means is that you need not check it, and that this
 370  * invariant will hold if you make sure that the netif_*_queue()
 371  * calls are done at the proper times.
 372  */
 373 static int mpc52xx_fec_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 374 {
 375         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 376         struct bcom_fec_bd *bd;
 377
 378         if (bcom_queue_full(priv->tx_dmatsk)) {
 379                 if (net_ratelimit())
 380                         dev_err(&dev->dev, "transmit queue overrun\n");
 381                 return 1;
 382         }
 383
 384         spin_lock_irq(&priv->lock);
 385         dev->trans_start = jiffies;
 386
 387         bd = (struct bcom_fec_bd *)
 388                 bcom_prepare_next_buffer(priv->tx_dmatsk);
 389
 390         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
 391         bd->skb_pa = dma_map_single(&dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
 392
 393         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
 394
 395         if (bcom_queue_full(priv->tx_dmatsk)) {
 396                 netif_stop_queue(dev);
 397         }
 398
 399         spin_unlock_irq(&priv->lock);
 400
 401         return 0;
 402 }
 403
 404 /* This handles BestComm transmit task interrupts
 405  */
 406 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
 407 {
 408         struct net_device *dev = dev_id;
 409         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 410
 411         spin_lock(&priv->lock);
 412
 413         while (bcom_buffer_done(priv->tx_dmatsk)) {
 414                 struct sk_buff *skb;
 415                 struct bcom_fec_bd *bd;
 416                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
 417                                 (struct bcom_bd **)&bd);
 418                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_TO_DEVICE);
 419
 420                 dev_kfree_skb_irq(skb);
 421         }
 422
 423         netif_wake_queue(dev);
 424
 425         spin_unlock(&priv->lock);
 426
 427         return IRQ_HANDLED;
 428 }
 429
 430 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
 431 {
 432         struct net_device *dev = dev_id;
 433         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 434
 435         while (bcom_buffer_done(priv->rx_dmatsk)) {
 436                 struct sk_buff *skb;
 437                 struct sk_buff *rskb;
 438                 struct bcom_fec_bd *bd;
 439                 u32 status;
 440
 441                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
 442                                 (struct bcom_bd **)&bd);
 443                 dma_unmap_single(&dev->dev, bd->skb_pa, rskb->len, DMA_FROM_DEVICE);
 444
 445                 /* Test for errors in received frame */
 446                 if (status & BCOM_FEC_RX_BD_ERRORS) {
 447                         /* Drop packet and reuse the buffer */
 448                         bd = (struct bcom_fec_bd *)
 449                                 bcom_prepare_next_buffer(priv->rx_dmatsk);
 450
 451                         bd->status = FEC_RX_BUFFER_SIZE;
 452                         bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
 453                                         FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 454
 455                         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
 456
 457                         dev->stats.rx_dropped++;
 458
 459                         continue;
 460                 }
 461
 462                 /* skbs are allocated on open, so now we allocate a new one,
 463                  * and remove the old (with the packet) */
 464                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 465                 if (skb) {
 466                         /* Process the received skb */
 467                         int length = status & BCOM_FEC_RX_BD_LEN_MASK;
 468
 469                         skb_put(rskb, length - 4);      /* length without CRC32 */
 470
 471                         rskb->dev = dev;
 472                         rskb->protocol = eth_type_trans(rskb, dev);
 473
 474                         netif_rx(rskb);
 475                         dev->last_rx = jiffies;
 476                 } else {
 477                         /* Can't get a new one : reuse the same & drop pkt */
 478                         dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
 479                         dev->stats.rx_dropped++;
 480
 481                         skb = rskb;
 482                 }
 483
 484                 bd = (struct bcom_fec_bd *)
 485                         bcom_prepare_next_buffer(priv->rx_dmatsk);
 486
 487                 bd->status = FEC_RX_BUFFER_SIZE;
 488                 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
 489                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 490
 491                 bcom_submit_next_buffer(priv->rx_dmatsk, skb);
 492         }
 493
 494         return IRQ_HANDLED;
 495 }
 496
 497 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
 498 {
 499         struct net_device *dev = dev_id;
 500         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 501         struct mpc52xx_fec __iomem *fec = priv->fec;
 502         u32 ievent;
 503
 504         ievent = in_be32(&fec->ievent);
 505
 506         ievent &= ~FEC_IEVENT_MII;      /* mii is handled separately */
 507         if (!ievent)
 508                 return IRQ_NONE;
 509
 510         out_be32(&fec->ievent, ievent);         /* clear pending events */
 511
 512         /* on fifo error, soft-reset fec */
 513         if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
 514
 515                 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
 516                         dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
 517                 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
 518                         dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
 519
 520                 mpc52xx_fec_reset(dev);
 521
 522                 netif_wake_queue(dev);
 523                 return IRQ_HANDLED;
 524         }
 525
 526         if (ievent & ~FEC_IEVENT_TFINT)
 527                 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
 528
 529         return IRQ_HANDLED;
 530 }
 531
 532 /*
 533  * Get the current statistics.
 534  * This may be called with the card open or closed.
 535  */
 536 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
 537 {
 538         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 539         struct net_device_stats *stats = &dev->stats;
 540         struct mpc52xx_fec __iomem *fec = priv->fec;
 541
 542         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
 543         stats->rx_packets = in_be32(&fec->rmon_r_packets);
 544         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
 545                 in_be32(&fec->rmon_r_undersize) +
 546                 in_be32(&fec->rmon_r_oversize) +
 547                 in_be32(&fec->rmon_r_frag) +
 548                 in_be32(&fec->rmon_r_jab);
 549
 550         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
 551         stats->tx_packets = in_be32(&fec->rmon_t_packets);
 552         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
 553                 in_be32(&fec->rmon_t_undersize) +
 554                 in_be32(&fec->rmon_t_oversize) +
 555                 in_be32(&fec->rmon_t_frag) +
 556                 in_be32(&fec->rmon_t_jab);
 557
 558         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
 559         stats->collisions = in_be32(&fec->rmon_t_col);
 560
 561         /* detailed rx_errors: */
 562         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
 563                                         + in_be32(&fec->rmon_r_oversize)
 564                                         + in_be32(&fec->rmon_r_frag)
 565                                         + in_be32(&fec->rmon_r_jab);
 566         stats->rx_over_errors = in_be32(&fec->r_macerr);
 567         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
 568         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
 569         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
 570         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
 571
 572         /* detailed tx_errors: */
 573         stats->tx_aborted_errors = 0;
 574         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
 575         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
 576         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
 577         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
 578
 579         return stats;
 580 }
 581
 582 /*
 583  * Read MIB counters in order to reset them,
 584  * then zero all the stats fields in memory
 585  */
 586 static void mpc52xx_fec_reset_stats(struct net_device *dev)
 587 {
 588         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 589         struct mpc52xx_fec __iomem *fec = priv->fec;
 590
 591         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
 592         memset_io(&fec->rmon_t_drop, 0,
 593                    offsetof(struct mpc52xx_fec, reserved10) -
 594                    offsetof(struct mpc52xx_fec, rmon_t_drop));
 595         out_be32(&fec->mib_control, 0);
 596
 597         memset(&dev->stats, 0, sizeof(dev->stats));
 598 }
 599
 600 /*
 601  * Set or clear the multicast filter for this adaptor.
 602  */
 603 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
 604 {
 605         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 606         struct mpc52xx_fec __iomem *fec = priv->fec;
 607         u32 rx_control;
 608
 609         rx_control = in_be32(&fec->r_cntrl);
 610
 611         if (dev->flags & IFF_PROMISC) {
 612                 rx_control |= FEC_RCNTRL_PROM;
 613                 out_be32(&fec->r_cntrl, rx_control);
 614         } else {
 615                 rx_control &= ~FEC_RCNTRL_PROM;
 616                 out_be32(&fec->r_cntrl, rx_control);
 617
 618                 if (dev->flags & IFF_ALLMULTI) {
 619                         out_be32(&fec->gaddr1, 0xffffffff);
 620                         out_be32(&fec->gaddr2, 0xffffffff);
 621                 } else {
 622                         u32 crc;
 623                         int i;
 624                         struct dev_mc_list *dmi;
 625                         u32 gaddr1 = 0x00000000;
 626                         u32 gaddr2 = 0x00000000;
 627
 628                         dmi = dev->mc_list;
 629                         for (i=0; i<dev->mc_count; i++) {
 630                                 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
 631                                 if (crc >= 32)
 632                                         gaddr1 |= 1 << (crc-32);
 633                                 else
 634                                         gaddr2 |= 1 << crc;
 635                                 dmi = dmi->next;
 636                         }
 637                         out_be32(&fec->gaddr1, gaddr1);
 638                         out_be32(&fec->gaddr2, gaddr2);
 639                 }
 640         }
 641 }
 642
 643 /**
 644  * mpc52xx_fec_hw_init
 645  * @dev: network device
 646  *
 647  * Setup various hardware setting, only needed once on start
 648  */
 649 static void mpc52xx_fec_hw_init(struct net_device *dev)
 650 {
 651         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 652         struct mpc52xx_fec __iomem *fec = priv->fec;
 653         int i;
 654
 655         /* Whack a reset.  We should wait for this. */
 656         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
 657         for (i = 0; i < FEC_RESET_DELAY; ++i) {
 658                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
 659                         break;
 660                 udelay(1);
 661         }
 662         if (i == FEC_RESET_DELAY)
 663                 dev_err(&dev->dev, "FEC Reset timeout!\n");
 664
 665         /* set pause to 0x20 frames */
 666         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
 667
 668         /* high service request will be deasserted when there's < 7 bytes in fifo
 669          * low service request will be deasserted when there's < 4*7 bytes in fifo
 670          */
 671         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 672         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 673
 674         /* alarm when <= x bytes in FIFO */
 675         out_be32(&fec->rfifo_alarm, 0x0000030c);
 676         out_be32(&fec->tfifo_alarm, 0x00000100);
 677
 678         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
 679         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
 680
 681         /* enable crc generation */
 682         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
 683         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
 684         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
 685
 686         /* set phy speed.
 687          * this can't be done in phy driver, since it needs to be called
 688          * before fec stuff (even on resume) */
 689         mpc52xx_fec_phy_hw_init(priv);
 690 }
 691
 692 /**
 693  * mpc52xx_fec_start
 694  * @dev: network device
 695  *
 696  * This function is called to start or restart the FEC during a link
 697  * change.  This happens on fifo errors or when switching between half
 698  * and full duplex.
 699  */
 700 static void mpc52xx_fec_start(struct net_device *dev)
 701 {
 702         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 703         struct mpc52xx_fec __iomem *fec = priv->fec;
 704         u32 rcntrl;
 705         u32 tcntrl;
 706         u32 tmp;
 707
 708         /* clear sticky error bits */
 709         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
 710         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
 711         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
 712
 713         /* FIFOs will reset on mpc52xx_fec_enable */
 714         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
 715
 716         /* Set station address. */
 717         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
 718
 719         mpc52xx_fec_set_multicast_list(dev);
 720
 721         /* set max frame len, enable flow control, select mii mode */
 722         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
 723         rcntrl |= FEC_RCNTRL_FCE;
 724
 725         if (priv->phy_addr != FEC5200_PHYADDR_7WIRE)
 726                 rcntrl |= FEC_RCNTRL_MII_MODE;
 727
 728         if (priv->duplex == DUPLEX_FULL)
 729                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
 730         else {
 731                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 732                 tcntrl = 0;
 733         }
 734         out_be32(&fec->r_cntrl, rcntrl);
 735         out_be32(&fec->x_cntrl, tcntrl);
 736
 737         /* Clear any outstanding interrupt. */
 738         out_be32(&fec->ievent, 0xffffffff);
 739
 740         /* Enable interrupts we wish to service. */
 741         out_be32(&fec->imask, FEC_IMASK_ENABLE);
 742
 743         /* And last, enable the transmit and receive processing. */
 744         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
 745         out_be32(&fec->r_des_active, 0x01000000);
 746 }
 747
 748 /**
 749  * mpc52xx_fec_stop
 750  * @dev: network device
 751  *
 752  * stop all activity on fec and empty dma buffers
 753  */
 754 static void mpc52xx_fec_stop(struct net_device *dev)
 755 {
 756         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 757         struct mpc52xx_fec __iomem *fec = priv->fec;
 758         unsigned long timeout;
 759
 760         /* disable all interrupts */
 761         out_be32(&fec->imask, 0);
 762
 763         /* Disable the rx task. */
 764         bcom_disable(priv->rx_dmatsk);
 765
 766         /* Wait for tx queue to drain, but only if we're in process context */
 767         if (!in_interrupt()) {
 768                 timeout = jiffies + msecs_to_jiffies(2000);
 769                 while (time_before(jiffies, timeout) &&
 770                                 !bcom_queue_empty(priv->tx_dmatsk))
 771                         msleep(100);
 772
 773                 if (time_after_eq(jiffies, timeout))
 774                         dev_err(&dev->dev, "queues didn't drain\n");
 775 #if 1
 776                 if (time_after_eq(jiffies, timeout)) {
 777                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
 778                                         priv->tx_dmatsk->index,
 779                                         priv->tx_dmatsk->outdex);
 780                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
 781                                         priv->rx_dmatsk->index,
 782                                         priv->rx_dmatsk->outdex);
 783                 }
 784 #endif
 785         }
 786
 787         bcom_disable(priv->tx_dmatsk);
 788
 789         /* Stop FEC */
 790         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
 791
 792         return;
 793 }
 794
 795 /* reset fec and bestcomm tasks */
 796 static void mpc52xx_fec_reset(struct net_device *dev)
 797 {
 798         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 799         struct mpc52xx_fec __iomem *fec = priv->fec;
 800
 801         mpc52xx_fec_stop(dev);
 802
 803         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
 804         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
 805
 806         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 807
 808         mpc52xx_fec_hw_init(dev);
 809
 810         phy_stop(priv->phydev);
 811         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
 812         phy_start(priv->phydev);
 813
 814         bcom_fec_rx_reset(priv->rx_dmatsk);
 815         bcom_fec_tx_reset(priv->tx_dmatsk);
 816
 817         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 818
 819         bcom_enable(priv->rx_dmatsk);
 820         bcom_enable(priv->tx_dmatsk);
 821
 822         mpc52xx_fec_start(dev);
 823 }
 824
 825
 826 /* ethtool interface */
 827 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
 828                 struct ethtool_drvinfo *info)
 829 {
 830         strcpy(info->driver, DRIVER_NAME);
 831 }
 832
 833 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 834 {
 835         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 836         return phy_ethtool_gset(priv->phydev, cmd);
 837 }
 838
 839 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 840 {
 841         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 842         return phy_ethtool_sset(priv->phydev, cmd);
 843 }
 844
 845 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
 846 {
 847         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 848         return priv->msg_enable;
 849 }
 850
 851 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
 852 {
 853         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 854         priv->msg_enable = level;
 855 }
 856
 857 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
 858         .get_drvinfo = mpc52xx_fec_get_drvinfo,
 859         .get_settings = mpc52xx_fec_get_settings,
 860         .set_settings = mpc52xx_fec_set_settings,
 861         .get_link = ethtool_op_get_link,
 862         .get_msglevel = mpc52xx_fec_get_msglevel,
 863         .set_msglevel = mpc52xx_fec_set_msglevel,
 864 };
 865
 866
 867 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 868 {
 869         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 870
 871         return mpc52xx_fec_phy_mii_ioctl(priv, if_mii(rq), cmd);
 872 }
 873
 874 /* ======================================================================== */
 875 /* OF Driver                                                                */
 876 /* ======================================================================== */
 877
 878 static int __devinit
 879 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
 880 {
 881         int rv;
 882         struct net_device *ndev;
 883         struct mpc52xx_fec_priv *priv = NULL;
 884         struct resource mem;
 885         struct device_node *phy_node;
 886         const phandle *phy_handle;
 887         const u32 *prop;
 888         int prop_size;
 889
 890         phys_addr_t rx_fifo;
 891         phys_addr_t tx_fifo;
 892
 893         /* Get the ether ndev & it's private zone */
 894         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
 895         if (!ndev)
 896                 return -ENOMEM;
 897
 898         priv = netdev_priv(ndev);
 899
 900         /* Reserve FEC control zone */
 901         rv = of_address_to_resource(op->node, 0, &mem);
 902         if (rv) {
 903                 printk(KERN_ERR DRIVER_NAME ": "
 904                                 "Error while parsing device node resource\n" );
 905                 return rv;
 906         }
 907         if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
 908                 printk(KERN_ERR DRIVER_NAME
 909                         " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
 910                         (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
 911                 return -EINVAL;
 912         }
 913
 914         if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
 915                 return -EBUSY;
 916
 917         /* Init ether ndev with what we have */
 918         ndev->open              = mpc52xx_fec_open;
 919         ndev->stop              = mpc52xx_fec_close;
 920         ndev->hard_start_xmit   = mpc52xx_fec_hard_start_xmit;
 921         ndev->do_ioctl          = mpc52xx_fec_ioctl;
 922         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
 923         ndev->get_stats         = mpc52xx_fec_get_stats;
 924         ndev->set_mac_address   = mpc52xx_fec_set_mac_address;
 925         ndev->set_multicast_list = mpc52xx_fec_set_multicast_list;
 926         ndev->tx_timeout        = mpc52xx_fec_tx_timeout;
 927         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
 928         ndev->base_addr         = mem.start;
 929
 930         priv->t_irq = priv->r_irq = ndev->irq = NO_IRQ; /* IRQ are free for now */
 931
 932         spin_lock_init(&priv->lock);
 933
 934         /* ioremap the zones */
 935         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
 936
 937         if (!priv->fec) {
 938                 rv = -ENOMEM;
 939                 goto probe_error;
 940         }
 941
 942         /* Bestcomm init */
 943         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
 944         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
 945
 946         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
 947         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
 948
 949         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
 950                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
 951                 rv = -ENOMEM;
 952                 goto probe_error;
 953         }
 954
 955         /* Get the IRQ we need one by one */
 956                 /* Control */
 957         ndev->irq = irq_of_parse_and_map(op->node, 0);
 958
 959                 /* RX */
 960         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
 961
 962                 /* TX */
 963         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
 964
 965         /* MAC address init */
 966         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
 967                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
 968         else
 969                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
 970
 971         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
 972
 973         /*
 974          * Link mode configuration
 975          */
 976
 977         /* Start with safe defaults for link connection */
 978         priv->phy_addr = FEC5200_PHYADDR_NONE;
 979         priv->speed = 100;
 980         priv->duplex = DUPLEX_HALF;
 981         priv->phy_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
 982
 983         /* the 7-wire property means don't use MII mode */
 984         if (of_find_property(op->node, "fsl,7-wire-mode", NULL))
 985                 priv->phy_addr = FEC5200_PHYADDR_7WIRE;
 986
 987         /* The current speed preconfigures the speed of the MII link */
 988         prop = of_get_property(op->node, "current-speed", &prop_size);
 989         if (prop && (prop_size >= sizeof(u32) * 2)) {
 990                 priv->speed = prop[0];
 991                 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
 992         }
 993
 994         /* If there is a phy handle, setup link to that phy */
 995         phy_handle = of_get_property(op->node, "phy-handle", &prop_size);
 996         if (phy_handle && (prop_size >= sizeof(phandle))) {
 997                 phy_node = of_find_node_by_phandle(*phy_handle);
 998                 prop = of_get_property(phy_node, "reg", &prop_size);
 999                 if (prop && (prop_size >= sizeof(u32)))
1000                         if ((*prop >= 0) && (*prop < PHY_MAX_ADDR))
1001                                 priv->phy_addr = *prop;
1002                 of_node_put(phy_node);
1003         }
1004
1005         /* Hardware init */
1006         mpc52xx_fec_hw_init(ndev);
1007
1008         mpc52xx_fec_reset_stats(ndev);
1009
1010         SET_NETDEV_DEV(ndev, &op->dev);
1011
1012         /* Register the new network device */
1013         rv = register_netdev(ndev);
1014         if (rv < 0)
1015                 goto probe_error;
1016
1017         /* Now report the link setup */
1018         switch (priv->phy_addr) {
1019          case FEC5200_PHYADDR_NONE:
1020                 dev_info(&ndev->dev, "Fixed speed MII link: %i%cD\n",
1021                          priv->speed, priv->duplex ? 'F' : 'H');
1022                 break;
1023          case FEC5200_PHYADDR_7WIRE:
1024                 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
1025                 break;
1026          default:
1027                 dev_info(&ndev->dev, "Using PHY at MDIO address %i\n",
1028                          priv->phy_addr);
1029         }
1030
1031         /* We're done ! */
1032         dev_set_drvdata(&op->dev, ndev);
1033
1034         return 0;
1035
1036
1037         /* Error handling - free everything that might be allocated */
1038 probe_error:
1039
1040         irq_dispose_mapping(ndev->irq);
1041
1042         if (priv->rx_dmatsk)
1043                 bcom_fec_rx_release(priv->rx_dmatsk);
1044         if (priv->tx_dmatsk)
1045                 bcom_fec_tx_release(priv->tx_dmatsk);
1046
1047         if (priv->fec)
1048                 iounmap(priv->fec);
1049
1050         release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
1051
1052         free_netdev(ndev);
1053
1054         return rv;
1055 }
1056
1057 static int
1058 mpc52xx_fec_remove(struct of_device *op)
1059 {
1060         struct net_device *ndev;
1061         struct mpc52xx_fec_priv *priv;
1062
1063         ndev = dev_get_drvdata(&op->dev);
1064         priv = netdev_priv(ndev);
1065
1066         unregister_netdev(ndev);
1067
1068         irq_dispose_mapping(ndev->irq);
1069
1070         bcom_fec_rx_release(priv->rx_dmatsk);
1071         bcom_fec_tx_release(priv->tx_dmatsk);
1072
1073         iounmap(priv->fec);
1074
1075         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1076
1077         free_netdev(ndev);
1078
1079         dev_set_drvdata(&op->dev, NULL);
1080         return 0;
1081 }
1082
1083 #ifdef CONFIG_PM
1084 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1085 {
1086         struct net_device *dev = dev_get_drvdata(&op->dev);
1087
1088         if (netif_running(dev))
1089                 mpc52xx_fec_close(dev);
1090
1091         return 0;
1092 }
1093
1094 static int mpc52xx_fec_of_resume(struct of_device *op)
1095 {
1096         struct net_device *dev = dev_get_drvdata(&op->dev);
1097
1098         mpc52xx_fec_hw_init(dev);
1099         mpc52xx_fec_reset_stats(dev);
1100
1101         if (netif_running(dev))
1102                 mpc52xx_fec_open(dev);
1103
1104         return 0;
1105 }
1106 #endif
1107
1108 static struct of_device_id mpc52xx_fec_match[] = {
1109         { .type = "network", .compatible = "fsl,mpc5200b-fec", },
1110         { .type = "network", .compatible = "fsl,mpc5200-fec", },
1111         { .type = "network", .compatible = "mpc5200-fec", },
1112         { }
1113 };
1114
1115 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1116
1117 static struct of_platform_driver mpc52xx_fec_driver = {
1118         .owner          = THIS_MODULE,
1119         .name           = DRIVER_NAME,
1120         .match_table    = mpc52xx_fec_match,
1121         .probe          = mpc52xx_fec_probe,
1122         .remove         = mpc52xx_fec_remove,
1123 #ifdef CONFIG_PM
1124         .suspend        = mpc52xx_fec_of_suspend,
1125         .resume         = mpc52xx_fec_of_resume,
1126 #endif
1127 };
1128
1129
1130 /* ======================================================================== */
1131 /* Module                                                                   */
1132 /* ======================================================================== */
1133
1134 static int __init
1135 mpc52xx_fec_init(void)
1136 {
1137 #ifdef CONFIG_FEC_MPC52xx_MDIO
1138         int ret;
1139         ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1140         if (ret) {
1141                 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1142                 return ret;
1143         }
1144 #endif
1145         return of_register_platform_driver(&mpc52xx_fec_driver);
1146 }
1147
1148 static void __exit
1149 mpc52xx_fec_exit(void)
1150 {
1151         of_unregister_platform_driver(&mpc52xx_fec_driver);
1152 #ifdef CONFIG_FEC_MPC52xx_MDIO
1153         of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1154 #endif
1155 }
1156
1157
1158 module_init(mpc52xx_fec_init);
1159 module_exit(mpc52xx_fec_exit);
1160
1161 MODULE_LICENSE("GPL");
1162 MODULE_AUTHOR("Dale Farnsworth");
1163 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");