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 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
  47 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
  48 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
  49 static void mpc52xx_fec_stop(struct net_device *dev);
  50 static void mpc52xx_fec_start(struct net_device *dev);
  51 static void mpc52xx_fec_reset(struct net_device *dev);
  52
  53 static u8 mpc52xx_fec_mac_addr[6];
  54 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
  55 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
  56
  57 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
  58                 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFDOWN )
  59 static int debug = -1;  /* the above default */
  60 module_param(debug, int, 0);
  61 MODULE_PARM_DESC(debug, "debugging messages level");
  62
  63 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
  64 {
  65         dev_warn(&dev->dev, "transmit timed out\n");
  66
  67         mpc52xx_fec_reset(dev);
  68
  69         dev->stats.tx_errors++;
  70
  71         netif_wake_queue(dev);
  72 }
  73
  74 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
  75 {
  76         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
  77         struct mpc52xx_fec __iomem *fec = priv->fec;
  78
  79         out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
  80         out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
  81 }
  82
  83 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
  84 {
  85         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
  86         struct mpc52xx_fec __iomem *fec = priv->fec;
  87
  88         *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
  89         *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
  90 }
  91
  92 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
  93 {
  94         struct sockaddr *sock = addr;
  95
  96         memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
  97
  98         mpc52xx_fec_set_paddr(dev, sock->sa_data);
  99         return 0;
 100 }
 101
 102 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
 103 {
 104         while (!bcom_queue_empty(s)) {
 105                 struct bcom_fec_bd *bd;
 106                 struct sk_buff *skb;
 107
 108                 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
 109                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
 110                 kfree_skb(skb);
 111         }
 112 }
 113
 114 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
 115 {
 116         while (!bcom_queue_full(rxtsk)) {
 117                 struct sk_buff *skb;
 118                 struct bcom_fec_bd *bd;
 119
 120                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 121                 if (skb == NULL)
 122                         return -EAGAIN;
 123
 124                 /* zero out the initial receive buffers to aid debugging */
 125                 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
 126
 127                 bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);
 128
 129                 bd->status = FEC_RX_BUFFER_SIZE;
 130                 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
 131                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 132
 133                 bcom_submit_next_buffer(rxtsk, skb);
 134         }
 135
 136         return 0;
 137 }
 138
 139 /* based on generic_adjust_link from fs_enet-main.c */
 140 static void mpc52xx_fec_adjust_link(struct net_device *dev)
 141 {
 142         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 143         struct phy_device *phydev = priv->phydev;
 144         int new_state = 0;
 145
 146         if (phydev->link != PHY_DOWN) {
 147                 if (phydev->duplex != priv->duplex) {
 148                         struct mpc52xx_fec __iomem *fec = priv->fec;
 149                         u32 rcntrl;
 150                         u32 tcntrl;
 151
 152                         new_state = 1;
 153                         priv->duplex = phydev->duplex;
 154
 155                         rcntrl = in_be32(&fec->r_cntrl);
 156                         tcntrl = in_be32(&fec->x_cntrl);
 157
 158                         rcntrl &= ~FEC_RCNTRL_DRT;
 159                         tcntrl &= ~FEC_TCNTRL_FDEN;
 160                         if (phydev->duplex == DUPLEX_FULL)
 161                                 tcntrl |= FEC_TCNTRL_FDEN;      /* FD enable */
 162                         else
 163                                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 164
 165                         out_be32(&fec->r_cntrl, rcntrl);
 166                         out_be32(&fec->x_cntrl, tcntrl);
 167                 }
 168
 169                 if (phydev->speed != priv->speed) {
 170                         new_state = 1;
 171                         priv->speed = phydev->speed;
 172                 }
 173
 174                 if (priv->link == PHY_DOWN) {
 175                         new_state = 1;
 176                         priv->link = phydev->link;
 177                         netif_schedule(dev);
 178                         netif_carrier_on(dev);
 179                         netif_start_queue(dev);
 180                 }
 181
 182         } else if (priv->link) {
 183                 new_state = 1;
 184                 priv->link = PHY_DOWN;
 185                 priv->speed = 0;
 186                 priv->duplex = -1;
 187                 netif_stop_queue(dev);
 188                 netif_carrier_off(dev);
 189         }
 190
 191         if (new_state && netif_msg_link(priv))
 192                 phy_print_status(phydev);
 193 }
 194
 195 static int mpc52xx_fec_init_phy(struct net_device *dev)
 196 {
 197         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 198         struct phy_device *phydev;
 199         char phy_id[BUS_ID_SIZE];
 200
 201         snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT,
 202                         (unsigned int)dev->base_addr, priv->phy_addr);
 203
 204         priv->link = PHY_DOWN;
 205         priv->speed = 0;
 206         priv->duplex = -1;
 207
 208         phydev = phy_connect(dev, phy_id, &mpc52xx_fec_adjust_link, 0, PHY_INTERFACE_MODE_MII);
 209         if (IS_ERR(phydev)) {
 210                 dev_err(&dev->dev, "phy_connect failed\n");
 211                 return PTR_ERR(phydev);
 212         }
 213         dev_info(&dev->dev, "attached phy %i to driver %s\n",
 214                         phydev->addr, phydev->drv->name);
 215
 216         priv->phydev = phydev;
 217
 218         return 0;
 219 }
 220
 221 static int mpc52xx_fec_phy_start(struct net_device *dev)
 222 {
 223         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 224         int err;
 225
 226         if (!priv->has_phy)
 227                 return 0;
 228
 229         err = mpc52xx_fec_init_phy(dev);
 230         if (err) {
 231                 dev_err(&dev->dev, "mpc52xx_fec_init_phy failed\n");
 232                 return err;
 233         }
 234
 235         /* reset phy - this also wakes it from PDOWN */
 236         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
 237         phy_start(priv->phydev);
 238
 239         return 0;
 240 }
 241
 242 static void mpc52xx_fec_phy_stop(struct net_device *dev)
 243 {
 244         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 245
 246         if (!priv->has_phy)
 247                 return;
 248
 249         phy_disconnect(priv->phydev);
 250         /* power down phy */
 251         phy_stop(priv->phydev);
 252         phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
 253 }
 254
 255 static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
 256                 struct mii_ioctl_data *mii_data, int cmd)
 257 {
 258         if (!priv->has_phy)
 259                 return -ENOTSUPP;
 260
 261         return phy_mii_ioctl(priv->phydev, mii_data, cmd);
 262 }
 263
 264 static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
 265 {
 266         struct mpc52xx_fec __iomem *fec = priv->fec;
 267
 268         if (!priv->has_phy)
 269                 return;
 270
 271         out_be32(&fec->mii_speed, priv->phy_speed);
 272 }
 273
 274 static int mpc52xx_fec_open(struct net_device *dev)
 275 {
 276         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 277         int err = -EBUSY;
 278
 279         if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
 280                         DRIVER_NAME "_ctrl", dev)) {
 281                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
 282                 goto out;
 283         }
 284         if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
 285                         DRIVER_NAME "_rx", dev)) {
 286                 dev_err(&dev->dev, "rx interrupt request failed\n");
 287                 goto free_ctrl_irq;
 288         }
 289         if (request_irq(priv->t_irq, &mpc52xx_fec_tx_interrupt, 0,
 290                         DRIVER_NAME "_tx", dev)) {
 291                 dev_err(&dev->dev, "tx interrupt request failed\n");
 292                 goto free_2irqs;
 293         }
 294
 295         bcom_fec_rx_reset(priv->rx_dmatsk);
 296         bcom_fec_tx_reset(priv->tx_dmatsk);
 297
 298         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 299         if (err) {
 300                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
 301                 goto free_irqs;
 302         }
 303
 304         err = mpc52xx_fec_phy_start(dev);
 305         if (err)
 306                 goto free_skbs;
 307
 308         bcom_enable(priv->rx_dmatsk);
 309         bcom_enable(priv->tx_dmatsk);
 310
 311         mpc52xx_fec_start(dev);
 312
 313         netif_start_queue(dev);
 314
 315         return 0;
 316
 317  free_skbs:
 318         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 319
 320  free_irqs:
 321         free_irq(priv->t_irq, dev);
 322  free_2irqs:
 323         free_irq(priv->r_irq, dev);
 324  free_ctrl_irq:
 325         free_irq(dev->irq, dev);
 326  out:
 327
 328         return err;
 329 }
 330
 331 static int mpc52xx_fec_close(struct net_device *dev)
 332 {
 333         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 334
 335         netif_stop_queue(dev);
 336
 337         mpc52xx_fec_stop(dev);
 338
 339         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 340
 341         free_irq(dev->irq, dev);
 342         free_irq(priv->r_irq, dev);
 343         free_irq(priv->t_irq, dev);
 344
 345         mpc52xx_fec_phy_stop(dev);
 346
 347         return 0;
 348 }
 349
 350 /* This will only be invoked if your driver is _not_ in XOFF state.
 351  * What this means is that you need not check it, and that this
 352  * invariant will hold if you make sure that the netif_*_queue()
 353  * calls are done at the proper times.
 354  */
 355 static int mpc52xx_fec_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 356 {
 357         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 358         struct bcom_fec_bd *bd;
 359
 360         if (bcom_queue_full(priv->tx_dmatsk)) {
 361                 if (net_ratelimit())
 362                         dev_err(&dev->dev, "transmit queue overrun\n");
 363                 return 1;
 364         }
 365
 366         spin_lock_irq(&priv->lock);
 367         dev->trans_start = jiffies;
 368
 369         bd = (struct bcom_fec_bd *)
 370                 bcom_prepare_next_buffer(priv->tx_dmatsk);
 371
 372         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
 373         bd->skb_pa = dma_map_single(&dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
 374
 375         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
 376
 377         if (bcom_queue_full(priv->tx_dmatsk)) {
 378                 netif_stop_queue(dev);
 379         }
 380
 381         spin_unlock_irq(&priv->lock);
 382
 383         return 0;
 384 }
 385
 386 /* This handles BestComm transmit task interrupts
 387  */
 388 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
 389 {
 390         struct net_device *dev = dev_id;
 391         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 392
 393         spin_lock(&priv->lock);
 394
 395         while (bcom_buffer_done(priv->tx_dmatsk)) {
 396                 struct sk_buff *skb;
 397                 struct bcom_fec_bd *bd;
 398                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
 399                                 (struct bcom_bd **)&bd);
 400                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_TO_DEVICE);
 401
 402                 dev_kfree_skb_irq(skb);
 403         }
 404
 405         netif_wake_queue(dev);
 406
 407         spin_unlock(&priv->lock);
 408
 409         return IRQ_HANDLED;
 410 }
 411
 412 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
 413 {
 414         struct net_device *dev = dev_id;
 415         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 416
 417         while (bcom_buffer_done(priv->rx_dmatsk)) {
 418                 struct sk_buff *skb;
 419                 struct sk_buff *rskb;
 420                 struct bcom_fec_bd *bd;
 421                 u32 status;
 422
 423                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
 424                                 (struct bcom_bd **)&bd);
 425                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
 426
 427                 /* Test for errors in received frame */
 428                 if (status & BCOM_FEC_RX_BD_ERRORS) {
 429                         /* Drop packet and reuse the buffer */
 430                         bd = (struct bcom_fec_bd *)
 431                                 bcom_prepare_next_buffer(priv->rx_dmatsk);
 432
 433                         bd->status = FEC_RX_BUFFER_SIZE;
 434                         bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
 435                                         FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 436
 437                         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
 438
 439                         dev->stats.rx_dropped++;
 440
 441                         continue;
 442                 }
 443
 444                 /* skbs are allocated on open, so now we allocate a new one,
 445                  * and remove the old (with the packet) */
 446                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 447                 if (skb) {
 448                         /* Process the received skb */
 449                         int length = status & BCOM_FEC_RX_BD_LEN_MASK;
 450
 451                         skb_put(rskb, length - 4);      /* length without CRC32 */
 452
 453                         rskb->dev = dev;
 454                         rskb->protocol = eth_type_trans(rskb, dev);
 455
 456                         netif_rx(rskb);
 457                         dev->last_rx = jiffies;
 458                 } else {
 459                         /* Can't get a new one : reuse the same & drop pkt */
 460                         dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
 461                         dev->stats.rx_dropped++;
 462
 463                         skb = rskb;
 464                 }
 465
 466                 bd = (struct bcom_fec_bd *)
 467                         bcom_prepare_next_buffer(priv->rx_dmatsk);
 468
 469                 bd->status = FEC_RX_BUFFER_SIZE;
 470                 bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
 471                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 472
 473                 bcom_submit_next_buffer(priv->rx_dmatsk, skb);
 474         }
 475
 476         return IRQ_HANDLED;
 477 }
 478
 479 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
 480 {
 481         struct net_device *dev = dev_id;
 482         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 483         struct mpc52xx_fec __iomem *fec = priv->fec;
 484         u32 ievent;
 485
 486         ievent = in_be32(&fec->ievent);
 487
 488         ievent &= ~FEC_IEVENT_MII;      /* mii is handled separately */
 489         if (!ievent)
 490                 return IRQ_NONE;
 491
 492         out_be32(&fec->ievent, ievent);         /* clear pending events */
 493
 494         if (ievent & ~(FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
 495                 if (ievent & ~FEC_IEVENT_TFINT)
 496                         dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
 497                 return IRQ_HANDLED;
 498         }
 499
 500         if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
 501                 dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
 502         if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
 503                 dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
 504
 505         mpc52xx_fec_reset(dev);
 506
 507         netif_wake_queue(dev);
 508         return IRQ_HANDLED;
 509 }
 510
 511 /*
 512  * Get the current statistics.
 513  * This may be called with the card open or closed.
 514  */
 515 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
 516 {
 517         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 518         struct net_device_stats *stats = &dev->stats;
 519         struct mpc52xx_fec __iomem *fec = priv->fec;
 520
 521         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
 522         stats->rx_packets = in_be32(&fec->rmon_r_packets);
 523         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
 524                 in_be32(&fec->rmon_r_undersize) +
 525                 in_be32(&fec->rmon_r_oversize) +
 526                 in_be32(&fec->rmon_r_frag) +
 527                 in_be32(&fec->rmon_r_jab);
 528
 529         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
 530         stats->tx_packets = in_be32(&fec->rmon_t_packets);
 531         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
 532                 in_be32(&fec->rmon_t_undersize) +
 533                 in_be32(&fec->rmon_t_oversize) +
 534                 in_be32(&fec->rmon_t_frag) +
 535                 in_be32(&fec->rmon_t_jab);
 536
 537         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
 538         stats->collisions = in_be32(&fec->rmon_t_col);
 539
 540         /* detailed rx_errors: */
 541         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
 542                                         + in_be32(&fec->rmon_r_oversize)
 543                                         + in_be32(&fec->rmon_r_frag)
 544                                         + in_be32(&fec->rmon_r_jab);
 545         stats->rx_over_errors = in_be32(&fec->r_macerr);
 546         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
 547         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
 548         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
 549         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
 550
 551         /* detailed tx_errors: */
 552         stats->tx_aborted_errors = 0;
 553         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
 554         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
 555         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
 556         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
 557
 558         return stats;
 559 }
 560
 561 /*
 562  * Read MIB counters in order to reset them,
 563  * then zero all the stats fields in memory
 564  */
 565 static void mpc52xx_fec_reset_stats(struct net_device *dev)
 566 {
 567         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 568         struct mpc52xx_fec __iomem *fec = priv->fec;
 569
 570         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
 571         memset_io(&fec->rmon_t_drop, 0, (__force u32)&fec->reserved10 -
 572                         (__force u32)&fec->rmon_t_drop);
 573         out_be32(&fec->mib_control, 0);
 574
 575         memset(&dev->stats, 0, sizeof(dev->stats));
 576 }
 577
 578 /*
 579  * Set or clear the multicast filter for this adaptor.
 580  */
 581 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
 582 {
 583         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 584         struct mpc52xx_fec __iomem *fec = priv->fec;
 585         u32 rx_control;
 586
 587         rx_control = in_be32(&fec->r_cntrl);
 588
 589         if (dev->flags & IFF_PROMISC) {
 590                 rx_control |= FEC_RCNTRL_PROM;
 591                 out_be32(&fec->r_cntrl, rx_control);
 592         } else {
 593                 rx_control &= ~FEC_RCNTRL_PROM;
 594                 out_be32(&fec->r_cntrl, rx_control);
 595
 596                 if (dev->flags & IFF_ALLMULTI) {
 597                         out_be32(&fec->gaddr1, 0xffffffff);
 598                         out_be32(&fec->gaddr2, 0xffffffff);
 599                 } else {
 600                         u32 crc;
 601                         int i;
 602                         struct dev_mc_list *dmi;
 603                         u32 gaddr1 = 0x00000000;
 604                         u32 gaddr2 = 0x00000000;
 605
 606                         dmi = dev->mc_list;
 607                         for (i=0; i<dev->mc_count; i++) {
 608                                 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
 609                                 if (crc >= 32)
 610                                         gaddr1 |= 1 << (crc-32);
 611                                 else
 612                                         gaddr2 |= 1 << crc;
 613                                 dmi = dmi->next;
 614                         }
 615                         out_be32(&fec->gaddr1, gaddr1);
 616                         out_be32(&fec->gaddr2, gaddr2);
 617                 }
 618         }
 619 }
 620
 621 /**
 622  * mpc52xx_fec_hw_init
 623  * @dev: network device
 624  *
 625  * Setup various hardware setting, only needed once on start
 626  */
 627 static void mpc52xx_fec_hw_init(struct net_device *dev)
 628 {
 629         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 630         struct mpc52xx_fec __iomem *fec = priv->fec;
 631         int i;
 632
 633         /* Whack a reset.  We should wait for this. */
 634         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
 635         for (i = 0; i < FEC_RESET_DELAY; ++i) {
 636                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
 637                         break;
 638                 udelay(1);
 639         }
 640         if (i == FEC_RESET_DELAY)
 641                 dev_err(&dev->dev, "FEC Reset timeout!\n");
 642
 643         /* set pause to 0x20 frames */
 644         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
 645
 646         /* high service request will be deasserted when there's < 7 bytes in fifo
 647          * low service request will be deasserted when there's < 4*7 bytes in fifo
 648          */
 649         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 650         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 651
 652         /* alarm when <= x bytes in FIFO */
 653         out_be32(&fec->rfifo_alarm, 0x0000030c);
 654         out_be32(&fec->tfifo_alarm, 0x00000100);
 655
 656         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
 657         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
 658
 659         /* enable crc generation */
 660         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
 661         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
 662         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
 663
 664         /* set phy speed.
 665          * this can't be done in phy driver, since it needs to be called
 666          * before fec stuff (even on resume) */
 667         mpc52xx_fec_phy_hw_init(priv);
 668 }
 669
 670 /**
 671  * mpc52xx_fec_start
 672  * @dev: network device
 673  *
 674  * This function is called to start or restart the FEC during a link
 675  * change.  This happens on fifo errors or when switching between half
 676  * and full duplex.
 677  */
 678 static void mpc52xx_fec_start(struct net_device *dev)
 679 {
 680         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 681         struct mpc52xx_fec __iomem *fec = priv->fec;
 682         u32 rcntrl;
 683         u32 tcntrl;
 684         u32 tmp;
 685
 686         /* clear sticky error bits */
 687         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
 688         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
 689         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
 690
 691         /* FIFOs will reset on mpc52xx_fec_enable */
 692         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
 693
 694         /* Set station address. */
 695         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
 696
 697         mpc52xx_fec_set_multicast_list(dev);
 698
 699         /* set max frame len, enable flow control, select mii mode */
 700         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
 701         rcntrl |= FEC_RCNTRL_FCE;
 702
 703         if (priv->has_phy)
 704                 rcntrl |= FEC_RCNTRL_MII_MODE;
 705
 706         if (priv->duplex == DUPLEX_FULL)
 707                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
 708         else {
 709                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 710                 tcntrl = 0;
 711         }
 712         out_be32(&fec->r_cntrl, rcntrl);
 713         out_be32(&fec->x_cntrl, tcntrl);
 714
 715         /* Clear any outstanding interrupt. */
 716         out_be32(&fec->ievent, 0xffffffff);
 717
 718         /* Enable interrupts we wish to service. */
 719         out_be32(&fec->imask, FEC_IMASK_ENABLE);
 720
 721         /* And last, enable the transmit and receive processing. */
 722         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
 723         out_be32(&fec->r_des_active, 0x01000000);
 724 }
 725
 726 /**
 727  * mpc52xx_fec_stop
 728  * @dev: network device
 729  *
 730  * stop all activity on fec and empty dma buffers
 731  */
 732 static void mpc52xx_fec_stop(struct net_device *dev)
 733 {
 734         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 735         struct mpc52xx_fec __iomem *fec = priv->fec;
 736         unsigned long timeout;
 737
 738         /* disable all interrupts */
 739         out_be32(&fec->imask, 0);
 740
 741         /* Disable the rx task. */
 742         bcom_disable(priv->rx_dmatsk);
 743
 744         /* Wait for tx queue to drain, but only if we're in process context */
 745         if (!in_interrupt()) {
 746                 timeout = jiffies + msecs_to_jiffies(2000);
 747                 while (time_before(jiffies, timeout) &&
 748                                 !bcom_queue_empty(priv->tx_dmatsk))
 749                         msleep(100);
 750
 751                 if (time_after_eq(jiffies, timeout))
 752                         dev_err(&dev->dev, "queues didn't drain\n");
 753 #if 1
 754                 if (time_after_eq(jiffies, timeout)) {
 755                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
 756                                         priv->tx_dmatsk->index,
 757                                         priv->tx_dmatsk->outdex);
 758                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
 759                                         priv->rx_dmatsk->index,
 760                                         priv->rx_dmatsk->outdex);
 761                 }
 762 #endif
 763         }
 764
 765         bcom_disable(priv->tx_dmatsk);
 766
 767         /* Stop FEC */
 768         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
 769
 770         return;
 771 }
 772
 773 /* reset fec and bestcomm tasks */
 774 static void mpc52xx_fec_reset(struct net_device *dev)
 775 {
 776         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 777         struct mpc52xx_fec __iomem *fec = priv->fec;
 778
 779         mpc52xx_fec_stop(dev);
 780
 781         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
 782         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
 783
 784         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 785
 786         mpc52xx_fec_hw_init(dev);
 787
 788         phy_stop(priv->phydev);
 789         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
 790         phy_start(priv->phydev);
 791
 792         bcom_fec_rx_reset(priv->rx_dmatsk);
 793         bcom_fec_tx_reset(priv->tx_dmatsk);
 794
 795         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 796
 797         bcom_enable(priv->rx_dmatsk);
 798         bcom_enable(priv->tx_dmatsk);
 799
 800         mpc52xx_fec_start(dev);
 801 }
 802
 803
 804 /* ethtool interface */
 805 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
 806                 struct ethtool_drvinfo *info)
 807 {
 808         strcpy(info->driver, DRIVER_NAME);
 809 }
 810
 811 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 812 {
 813         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 814         return phy_ethtool_gset(priv->phydev, cmd);
 815 }
 816
 817 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 818 {
 819         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 820         return phy_ethtool_sset(priv->phydev, cmd);
 821 }
 822
 823 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
 824 {
 825         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 826         return priv->msg_enable;
 827 }
 828
 829 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
 830 {
 831         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 832         priv->msg_enable = level;
 833 }
 834
 835 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
 836         .get_drvinfo = mpc52xx_fec_get_drvinfo,
 837         .get_settings = mpc52xx_fec_get_settings,
 838         .set_settings = mpc52xx_fec_set_settings,
 839         .get_link = ethtool_op_get_link,
 840         .get_msglevel = mpc52xx_fec_get_msglevel,
 841         .set_msglevel = mpc52xx_fec_set_msglevel,
 842 };
 843
 844
 845 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 846 {
 847         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 848
 849         return mpc52xx_fec_phy_mii_ioctl(priv, if_mii(rq), cmd);
 850 }
 851
 852 /* ======================================================================== */
 853 /* OF Driver                                                                */
 854 /* ======================================================================== */
 855
 856 static int __devinit
 857 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
 858 {
 859         int rv;
 860         struct net_device *ndev;
 861         struct mpc52xx_fec_priv *priv = NULL;
 862         struct resource mem;
 863         const phandle *ph;
 864
 865         phys_addr_t rx_fifo;
 866         phys_addr_t tx_fifo;
 867
 868         /* Get the ether ndev & it's private zone */
 869         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
 870         if (!ndev)
 871                 return -ENOMEM;
 872
 873         priv = netdev_priv(ndev);
 874
 875         /* Reserve FEC control zone */
 876         rv = of_address_to_resource(op->node, 0, &mem);
 877         if (rv) {
 878                 printk(KERN_ERR DRIVER_NAME ": "
 879                                 "Error while parsing device node resource\n" );
 880                 return rv;
 881         }
 882         if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
 883                 printk(KERN_ERR DRIVER_NAME
 884                         " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
 885                         (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
 886                 return -EINVAL;
 887         }
 888
 889         if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
 890                 return -EBUSY;
 891
 892         /* Init ether ndev with what we have */
 893         ndev->open              = mpc52xx_fec_open;
 894         ndev->stop              = mpc52xx_fec_close;
 895         ndev->hard_start_xmit   = mpc52xx_fec_hard_start_xmit;
 896         ndev->do_ioctl          = mpc52xx_fec_ioctl;
 897         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
 898         ndev->get_stats         = mpc52xx_fec_get_stats;
 899         ndev->set_mac_address   = mpc52xx_fec_set_mac_address;
 900         ndev->set_multicast_list = mpc52xx_fec_set_multicast_list;
 901         ndev->tx_timeout        = mpc52xx_fec_tx_timeout;
 902         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
 903         ndev->base_addr         = mem.start;
 904
 905         priv->t_irq = priv->r_irq = ndev->irq = NO_IRQ; /* IRQ are free for now */
 906
 907         spin_lock_init(&priv->lock);
 908
 909         /* ioremap the zones */
 910         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
 911
 912         if (!priv->fec) {
 913                 rv = -ENOMEM;
 914                 goto probe_error;
 915         }
 916
 917         /* Bestcomm init */
 918         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
 919         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
 920
 921         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
 922         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
 923
 924         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
 925                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
 926                 rv = -ENOMEM;
 927                 goto probe_error;
 928         }
 929
 930         /* Get the IRQ we need one by one */
 931                 /* Control */
 932         ndev->irq = irq_of_parse_and_map(op->node, 0);
 933
 934                 /* RX */
 935         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
 936
 937                 /* TX */
 938         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
 939
 940         /* MAC address init */
 941         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
 942                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
 943         else
 944                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
 945
 946         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
 947         priv->duplex = DUPLEX_FULL;
 948
 949         /* is the phy present in device tree? */
 950         ph = of_get_property(op->node, "phy-handle", NULL);
 951         if (ph) {
 952                 const unsigned int *prop;
 953                 struct device_node *phy_dn;
 954                 priv->has_phy = 1;
 955
 956                 phy_dn = of_find_node_by_phandle(*ph);
 957                 prop = of_get_property(phy_dn, "reg", NULL);
 958                 priv->phy_addr = *prop;
 959
 960                 of_node_put(phy_dn);
 961
 962                 /* Phy speed */
 963                 priv->phy_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
 964         } else {
 965                 dev_info(&ndev->dev, "can't find \"phy-handle\" in device"
 966                                 " tree, using 7-wire mode\n");
 967         }
 968
 969         /* Hardware init */
 970         mpc52xx_fec_hw_init(ndev);
 971
 972         mpc52xx_fec_reset_stats(ndev);
 973
 974         /* Register the new network device */
 975         rv = register_netdev(ndev);
 976         if (rv < 0)
 977                 goto probe_error;
 978
 979         /* We're done ! */
 980         dev_set_drvdata(&op->dev, ndev);
 981
 982         return 0;
 983
 984
 985         /* Error handling - free everything that might be allocated */
 986 probe_error:
 987
 988         irq_dispose_mapping(ndev->irq);
 989
 990         if (priv->rx_dmatsk)
 991                 bcom_fec_rx_release(priv->rx_dmatsk);
 992         if (priv->tx_dmatsk)
 993                 bcom_fec_tx_release(priv->tx_dmatsk);
 994
 995         if (priv->fec)
 996                 iounmap(priv->fec);
 997
 998         release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
 999
1000         free_netdev(ndev);
1001
1002         return rv;
1003 }
1004
1005 static int
1006 mpc52xx_fec_remove(struct of_device *op)
1007 {
1008         struct net_device *ndev;
1009         struct mpc52xx_fec_priv *priv;
1010
1011         ndev = dev_get_drvdata(&op->dev);
1012         priv = netdev_priv(ndev);
1013
1014         unregister_netdev(ndev);
1015
1016         irq_dispose_mapping(ndev->irq);
1017
1018         bcom_fec_rx_release(priv->rx_dmatsk);
1019         bcom_fec_tx_release(priv->tx_dmatsk);
1020
1021         iounmap(priv->fec);
1022
1023         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1024
1025         free_netdev(ndev);
1026
1027         dev_set_drvdata(&op->dev, NULL);
1028         return 0;
1029 }
1030
1031 #ifdef CONFIG_PM
1032 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1033 {
1034         struct net_device *dev = dev_get_drvdata(&op->dev);
1035
1036         if (netif_running(dev))
1037                 mpc52xx_fec_close(dev);
1038
1039         return 0;
1040 }
1041
1042 static int mpc52xx_fec_of_resume(struct of_device *op)
1043 {
1044         struct net_device *dev = dev_get_drvdata(&op->dev);
1045
1046         mpc52xx_fec_hw_init(dev);
1047         mpc52xx_fec_reset_stats(dev);
1048
1049         if (netif_running(dev))
1050                 mpc52xx_fec_open(dev);
1051
1052         return 0;
1053 }
1054 #endif
1055
1056 static struct of_device_id mpc52xx_fec_match[] = {
1057         {
1058                 .type           = "network",
1059                 .compatible     = "mpc5200-fec",
1060         },
1061         { }
1062 };
1063
1064 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1065
1066 static struct of_platform_driver mpc52xx_fec_driver = {
1067         .owner          = THIS_MODULE,
1068         .name           = DRIVER_NAME,
1069         .match_table    = mpc52xx_fec_match,
1070         .probe          = mpc52xx_fec_probe,
1071         .remove         = mpc52xx_fec_remove,
1072 #ifdef CONFIG_PM
1073         .suspend        = mpc52xx_fec_of_suspend,
1074         .resume         = mpc52xx_fec_of_resume,
1075 #endif
1076 };
1077
1078
1079 /* ======================================================================== */
1080 /* Module                                                                   */
1081 /* ======================================================================== */
1082
1083 static int __init
1084 mpc52xx_fec_init(void)
1085 {
1086 #ifdef CONFIG_FEC_MPC52xx_MDIO
1087         int ret;
1088         ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1089         if (ret) {
1090                 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1091                 return ret;
1092         }
1093 #endif
1094         return of_register_platform_driver(&mpc52xx_fec_driver);
1095 }
1096
1097 static void __exit
1098 mpc52xx_fec_exit(void)
1099 {
1100         of_unregister_platform_driver(&mpc52xx_fec_driver);
1101 #ifdef CONFIG_FEC_MPC52xx_MDIO
1102         of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1103 #endif
1104 }
1105
1106
1107 module_init(mpc52xx_fec_init);
1108 module_exit(mpc52xx_fec_exit);
1109
1110 MODULE_LICENSE("GPL");
1111 MODULE_AUTHOR("Dale Farnsworth");
1112 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");