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                         netif_schedule(dev);
 201                         netif_carrier_on(dev);
 202                         netif_start_queue(dev);
 203                 }
 204
 205         } else if (priv->link) {
 206                 new_state = 1;
 207                 priv->link = PHY_DOWN;
 208                 priv->speed = 0;
 209                 priv->duplex = -1;
 210                 netif_stop_queue(dev);
 211                 netif_carrier_off(dev);
 212         }
 213
 214         if (new_state && netif_msg_link(priv))
 215                 phy_print_status(phydev);
 216 }
 217
 218 static int mpc52xx_fec_init_phy(struct net_device *dev)
 219 {
 220         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 221         struct phy_device *phydev;
 222         char phy_id[BUS_ID_SIZE];
 223
 224         snprintf(phy_id, BUS_ID_SIZE, "%x:%02x",
 225                         (unsigned int)dev->base_addr, priv->phy_addr);
 226
 227         priv->link = PHY_DOWN;
 228         priv->speed = 0;
 229         priv->duplex = -1;
 230
 231         phydev = phy_connect(dev, phy_id, &mpc52xx_fec_adjust_link, 0, PHY_INTERFACE_MODE_MII);
 232         if (IS_ERR(phydev)) {
 233                 dev_err(&dev->dev, "phy_connect failed\n");
 234                 return PTR_ERR(phydev);
 235         }
 236         dev_info(&dev->dev, "attached phy %i to driver %s\n",
 237                         phydev->addr, phydev->drv->name);
 238
 239         priv->phydev = phydev;
 240
 241         return 0;
 242 }
 243
 244 static int mpc52xx_fec_phy_start(struct net_device *dev)
 245 {
 246         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 247         int err;
 248
 249         if (priv->phy_addr < 0)
 250                 return 0;
 251
 252         err = mpc52xx_fec_init_phy(dev);
 253         if (err) {
 254                 dev_err(&dev->dev, "mpc52xx_fec_init_phy failed\n");
 255                 return err;
 256         }
 257
 258         /* reset phy - this also wakes it from PDOWN */
 259         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
 260         phy_start(priv->phydev);
 261
 262         return 0;
 263 }
 264
 265 static void mpc52xx_fec_phy_stop(struct net_device *dev)
 266 {
 267         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 268
 269         if (!priv->phydev)
 270                 return;
 271
 272         phy_disconnect(priv->phydev);
 273         /* power down phy */
 274         phy_stop(priv->phydev);
 275         phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
 276 }
 277
 278 static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
 279                 struct mii_ioctl_data *mii_data, int cmd)
 280 {
 281         if (!priv->phydev)
 282                 return -ENOTSUPP;
 283
 284         return phy_mii_ioctl(priv->phydev, mii_data, cmd);
 285 }
 286
 287 static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
 288 {
 289         struct mpc52xx_fec __iomem *fec = priv->fec;
 290
 291         if (priv->phydev)
 292                 return;
 293
 294         out_be32(&fec->mii_speed, priv->phy_speed);
 295 }
 296
 297 static int mpc52xx_fec_open(struct net_device *dev)
 298 {
 299         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 300         int err = -EBUSY;
 301
 302         if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
 303                         DRIVER_NAME "_ctrl", dev)) {
 304                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
 305                 goto out;
 306         }
 307         if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
 308                         DRIVER_NAME "_rx", dev)) {
 309                 dev_err(&dev->dev, "rx interrupt request failed\n");
 310                 goto free_ctrl_irq;
 311         }
 312         if (request_irq(priv->t_irq, &mpc52xx_fec_tx_interrupt, 0,
 313                         DRIVER_NAME "_tx", dev)) {
 314                 dev_err(&dev->dev, "tx interrupt request failed\n");
 315                 goto free_2irqs;
 316         }
 317
 318         bcom_fec_rx_reset(priv->rx_dmatsk);
 319         bcom_fec_tx_reset(priv->tx_dmatsk);
 320
 321         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 322         if (err) {
 323                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
 324                 goto free_irqs;
 325         }
 326
 327         err = mpc52xx_fec_phy_start(dev);
 328         if (err)
 329                 goto free_skbs;
 330
 331         bcom_enable(priv->rx_dmatsk);
 332         bcom_enable(priv->tx_dmatsk);
 333
 334         mpc52xx_fec_start(dev);
 335
 336         netif_start_queue(dev);
 337
 338         return 0;
 339
 340  free_skbs:
 341         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 342
 343  free_irqs:
 344         free_irq(priv->t_irq, dev);
 345  free_2irqs:
 346         free_irq(priv->r_irq, dev);
 347  free_ctrl_irq:
 348         free_irq(dev->irq, dev);
 349  out:
 350
 351         return err;
 352 }
 353
 354 static int mpc52xx_fec_close(struct net_device *dev)
 355 {
 356         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 357
 358         netif_stop_queue(dev);
 359
 360         mpc52xx_fec_stop(dev);
 361
 362         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 363
 364         free_irq(dev->irq, dev);
 365         free_irq(priv->r_irq, dev);
 366         free_irq(priv->t_irq, dev);
 367
 368         mpc52xx_fec_phy_stop(dev);
 369
 370         return 0;
 371 }
 372
 373 /* This will only be invoked if your driver is _not_ in XOFF state.
 374  * What this means is that you need not check it, and that this
 375  * invariant will hold if you make sure that the netif_*_queue()
 376  * calls are done at the proper times.
 377  */
 378 static int mpc52xx_fec_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 379 {
 380         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 381         struct bcom_fec_bd *bd;
 382
 383         if (bcom_queue_full(priv->tx_dmatsk)) {
 384                 if (net_ratelimit())
 385                         dev_err(&dev->dev, "transmit queue overrun\n");
 386                 return 1;
 387         }
 388
 389         spin_lock_irq(&priv->lock);
 390         dev->trans_start = jiffies;
 391
 392         bd = (struct bcom_fec_bd *)
 393                 bcom_prepare_next_buffer(priv->tx_dmatsk);
 394
 395         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
 396         bd->skb_pa = dma_map_single(&dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
 397
 398         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
 399
 400         if (bcom_queue_full(priv->tx_dmatsk)) {
 401                 netif_stop_queue(dev);
 402         }
 403
 404         spin_unlock_irq(&priv->lock);
 405
 406         return 0;
 407 }
 408
 409 /* This handles BestComm transmit task interrupts
 410  */
 411 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
 412 {
 413         struct net_device *dev = dev_id;
 414         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 415
 416         spin_lock(&priv->lock);
 417
 418         while (bcom_buffer_done(priv->tx_dmatsk)) {
 419                 struct sk_buff *skb;
 420                 struct bcom_fec_bd *bd;
 421                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
 422                                 (struct bcom_bd **)&bd);
 423                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_TO_DEVICE);
 424
 425                 dev_kfree_skb_irq(skb);
 426         }
 427
 428         netif_wake_queue(dev);
 429
 430         spin_unlock(&priv->lock);
 431
 432         return IRQ_HANDLED;
 433 }
 434
 435 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
 436 {
 437         struct net_device *dev = dev_id;
 438         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 439
 440         while (bcom_buffer_done(priv->rx_dmatsk)) {
 441                 struct sk_buff *skb;
 442                 struct sk_buff *rskb;
 443                 struct bcom_fec_bd *bd;
 444                 u32 status;
 445
 446                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
 447                                 (struct bcom_bd **)&bd);
 448                 dma_unmap_single(&dev->dev, bd->skb_pa, rskb->len, DMA_FROM_DEVICE);
 449
 450                 /* Test for errors in received frame */
 451                 if (status & BCOM_FEC_RX_BD_ERRORS) {
 452                         /* Drop packet and reuse the buffer */
 453                         bd = (struct bcom_fec_bd *)
 454                                 bcom_prepare_next_buffer(priv->rx_dmatsk);
 455
 456                         bd->status = FEC_RX_BUFFER_SIZE;
 457                         bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
 458                                         FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 459
 460                         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
 461
 462                         dev->stats.rx_dropped++;
 463
 464                         continue;
 465                 }
 466
 467                 /* skbs are allocated on open, so now we allocate a new one,
 468                  * and remove the old (with the packet) */
 469                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 470                 if (skb) {
 471                         /* Process the received skb */
 472                         int length = status & BCOM_FEC_RX_BD_LEN_MASK;
 473
 474                         skb_put(rskb, length - 4);      /* length without CRC32 */
 475
 476                         rskb->dev = dev;
 477                         rskb->protocol = eth_type_trans(rskb, dev);
 478
 479                         netif_rx(rskb);
 480                         dev->last_rx = jiffies;
 481                 } else {
 482                         /* Can't get a new one : reuse the same & drop pkt */
 483                         dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
 484                         dev->stats.rx_dropped++;
 485
 486                         skb = rskb;
 487                 }
 488
 489                 bd = (struct bcom_fec_bd *)
 490                         bcom_prepare_next_buffer(priv->rx_dmatsk);
 491
 492                 bd->status = FEC_RX_BUFFER_SIZE;
 493                 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
 494                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 495
 496                 bcom_submit_next_buffer(priv->rx_dmatsk, skb);
 497         }
 498
 499         return IRQ_HANDLED;
 500 }
 501
 502 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
 503 {
 504         struct net_device *dev = dev_id;
 505         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 506         struct mpc52xx_fec __iomem *fec = priv->fec;
 507         u32 ievent;
 508
 509         ievent = in_be32(&fec->ievent);
 510
 511         ievent &= ~FEC_IEVENT_MII;      /* mii is handled separately */
 512         if (!ievent)
 513                 return IRQ_NONE;
 514
 515         out_be32(&fec->ievent, ievent);         /* clear pending events */
 516
 517         /* on fifo error, soft-reset fec */
 518         if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
 519
 520                 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
 521                         dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
 522                 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
 523                         dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
 524
 525                 mpc52xx_fec_reset(dev);
 526
 527                 netif_wake_queue(dev);
 528                 return IRQ_HANDLED;
 529         }
 530
 531         if (ievent & ~FEC_IEVENT_TFINT)
 532                 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
 533
 534         return IRQ_HANDLED;
 535 }
 536
 537 /*
 538  * Get the current statistics.
 539  * This may be called with the card open or closed.
 540  */
 541 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
 542 {
 543         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 544         struct net_device_stats *stats = &dev->stats;
 545         struct mpc52xx_fec __iomem *fec = priv->fec;
 546
 547         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
 548         stats->rx_packets = in_be32(&fec->rmon_r_packets);
 549         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
 550                 in_be32(&fec->rmon_r_undersize) +
 551                 in_be32(&fec->rmon_r_oversize) +
 552                 in_be32(&fec->rmon_r_frag) +
 553                 in_be32(&fec->rmon_r_jab);
 554
 555         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
 556         stats->tx_packets = in_be32(&fec->rmon_t_packets);
 557         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
 558                 in_be32(&fec->rmon_t_undersize) +
 559                 in_be32(&fec->rmon_t_oversize) +
 560                 in_be32(&fec->rmon_t_frag) +
 561                 in_be32(&fec->rmon_t_jab);
 562
 563         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
 564         stats->collisions = in_be32(&fec->rmon_t_col);
 565
 566         /* detailed rx_errors: */
 567         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
 568                                         + in_be32(&fec->rmon_r_oversize)
 569                                         + in_be32(&fec->rmon_r_frag)
 570                                         + in_be32(&fec->rmon_r_jab);
 571         stats->rx_over_errors = in_be32(&fec->r_macerr);
 572         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
 573         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
 574         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
 575         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
 576
 577         /* detailed tx_errors: */
 578         stats->tx_aborted_errors = 0;
 579         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
 580         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
 581         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
 582         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
 583
 584         return stats;
 585 }
 586
 587 /*
 588  * Read MIB counters in order to reset them,
 589  * then zero all the stats fields in memory
 590  */
 591 static void mpc52xx_fec_reset_stats(struct net_device *dev)
 592 {
 593         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 594         struct mpc52xx_fec __iomem *fec = priv->fec;
 595
 596         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
 597         memset_io(&fec->rmon_t_drop, 0,
 598                    offsetof(struct mpc52xx_fec, reserved10) -
 599                    offsetof(struct mpc52xx_fec, rmon_t_drop));
 600         out_be32(&fec->mib_control, 0);
 601
 602         memset(&dev->stats, 0, sizeof(dev->stats));
 603 }
 604
 605 /*
 606  * Set or clear the multicast filter for this adaptor.
 607  */
 608 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
 609 {
 610         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 611         struct mpc52xx_fec __iomem *fec = priv->fec;
 612         u32 rx_control;
 613
 614         rx_control = in_be32(&fec->r_cntrl);
 615
 616         if (dev->flags & IFF_PROMISC) {
 617                 rx_control |= FEC_RCNTRL_PROM;
 618                 out_be32(&fec->r_cntrl, rx_control);
 619         } else {
 620                 rx_control &= ~FEC_RCNTRL_PROM;
 621                 out_be32(&fec->r_cntrl, rx_control);
 622
 623                 if (dev->flags & IFF_ALLMULTI) {
 624                         out_be32(&fec->gaddr1, 0xffffffff);
 625                         out_be32(&fec->gaddr2, 0xffffffff);
 626                 } else {
 627                         u32 crc;
 628                         int i;
 629                         struct dev_mc_list *dmi;
 630                         u32 gaddr1 = 0x00000000;
 631                         u32 gaddr2 = 0x00000000;
 632
 633                         dmi = dev->mc_list;
 634                         for (i=0; i<dev->mc_count; i++) {
 635                                 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
 636                                 if (crc >= 32)
 637                                         gaddr1 |= 1 << (crc-32);
 638                                 else
 639                                         gaddr2 |= 1 << crc;
 640                                 dmi = dmi->next;
 641                         }
 642                         out_be32(&fec->gaddr1, gaddr1);
 643                         out_be32(&fec->gaddr2, gaddr2);
 644                 }
 645         }
 646 }
 647
 648 /**
 649  * mpc52xx_fec_hw_init
 650  * @dev: network device
 651  *
 652  * Setup various hardware setting, only needed once on start
 653  */
 654 static void mpc52xx_fec_hw_init(struct net_device *dev)
 655 {
 656         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 657         struct mpc52xx_fec __iomem *fec = priv->fec;
 658         int i;
 659
 660         /* Whack a reset.  We should wait for this. */
 661         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
 662         for (i = 0; i < FEC_RESET_DELAY; ++i) {
 663                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
 664                         break;
 665                 udelay(1);
 666         }
 667         if (i == FEC_RESET_DELAY)
 668                 dev_err(&dev->dev, "FEC Reset timeout!\n");
 669
 670         /* set pause to 0x20 frames */
 671         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
 672
 673         /* high service request will be deasserted when there's < 7 bytes in fifo
 674          * low service request will be deasserted when there's < 4*7 bytes in fifo
 675          */
 676         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 677         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 678
 679         /* alarm when <= x bytes in FIFO */
 680         out_be32(&fec->rfifo_alarm, 0x0000030c);
 681         out_be32(&fec->tfifo_alarm, 0x00000100);
 682
 683         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
 684         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
 685
 686         /* enable crc generation */
 687         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
 688         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
 689         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
 690
 691         /* set phy speed.
 692          * this can't be done in phy driver, since it needs to be called
 693          * before fec stuff (even on resume) */
 694         mpc52xx_fec_phy_hw_init(priv);
 695 }
 696
 697 /**
 698  * mpc52xx_fec_start
 699  * @dev: network device
 700  *
 701  * This function is called to start or restart the FEC during a link
 702  * change.  This happens on fifo errors or when switching between half
 703  * and full duplex.
 704  */
 705 static void mpc52xx_fec_start(struct net_device *dev)
 706 {
 707         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 708         struct mpc52xx_fec __iomem *fec = priv->fec;
 709         u32 rcntrl;
 710         u32 tcntrl;
 711         u32 tmp;
 712
 713         /* clear sticky error bits */
 714         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
 715         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
 716         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
 717
 718         /* FIFOs will reset on mpc52xx_fec_enable */
 719         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
 720
 721         /* Set station address. */
 722         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
 723
 724         mpc52xx_fec_set_multicast_list(dev);
 725
 726         /* set max frame len, enable flow control, select mii mode */
 727         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
 728         rcntrl |= FEC_RCNTRL_FCE;
 729
 730         if (priv->phy_addr != FEC5200_PHYADDR_7WIRE)
 731                 rcntrl |= FEC_RCNTRL_MII_MODE;
 732
 733         if (priv->duplex == DUPLEX_FULL)
 734                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
 735         else {
 736                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 737                 tcntrl = 0;
 738         }
 739         out_be32(&fec->r_cntrl, rcntrl);
 740         out_be32(&fec->x_cntrl, tcntrl);
 741
 742         /* Clear any outstanding interrupt. */
 743         out_be32(&fec->ievent, 0xffffffff);
 744
 745         /* Enable interrupts we wish to service. */
 746         out_be32(&fec->imask, FEC_IMASK_ENABLE);
 747
 748         /* And last, enable the transmit and receive processing. */
 749         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
 750         out_be32(&fec->r_des_active, 0x01000000);
 751 }
 752
 753 /**
 754  * mpc52xx_fec_stop
 755  * @dev: network device
 756  *
 757  * stop all activity on fec and empty dma buffers
 758  */
 759 static void mpc52xx_fec_stop(struct net_device *dev)
 760 {
 761         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 762         struct mpc52xx_fec __iomem *fec = priv->fec;
 763         unsigned long timeout;
 764
 765         /* disable all interrupts */
 766         out_be32(&fec->imask, 0);
 767
 768         /* Disable the rx task. */
 769         bcom_disable(priv->rx_dmatsk);
 770
 771         /* Wait for tx queue to drain, but only if we're in process context */
 772         if (!in_interrupt()) {
 773                 timeout = jiffies + msecs_to_jiffies(2000);
 774                 while (time_before(jiffies, timeout) &&
 775                                 !bcom_queue_empty(priv->tx_dmatsk))
 776                         msleep(100);
 777
 778                 if (time_after_eq(jiffies, timeout))
 779                         dev_err(&dev->dev, "queues didn't drain\n");
 780 #if 1
 781                 if (time_after_eq(jiffies, timeout)) {
 782                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
 783                                         priv->tx_dmatsk->index,
 784                                         priv->tx_dmatsk->outdex);
 785                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
 786                                         priv->rx_dmatsk->index,
 787                                         priv->rx_dmatsk->outdex);
 788                 }
 789 #endif
 790         }
 791
 792         bcom_disable(priv->tx_dmatsk);
 793
 794         /* Stop FEC */
 795         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
 796
 797         return;
 798 }
 799
 800 /* reset fec and bestcomm tasks */
 801 static void mpc52xx_fec_reset(struct net_device *dev)
 802 {
 803         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 804         struct mpc52xx_fec __iomem *fec = priv->fec;
 805
 806         mpc52xx_fec_stop(dev);
 807
 808         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
 809         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
 810
 811         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 812
 813         mpc52xx_fec_hw_init(dev);
 814
 815         phy_stop(priv->phydev);
 816         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
 817         phy_start(priv->phydev);
 818
 819         bcom_fec_rx_reset(priv->rx_dmatsk);
 820         bcom_fec_tx_reset(priv->tx_dmatsk);
 821
 822         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 823
 824         bcom_enable(priv->rx_dmatsk);
 825         bcom_enable(priv->tx_dmatsk);
 826
 827         mpc52xx_fec_start(dev);
 828 }
 829
 830
 831 /* ethtool interface */
 832 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
 833                 struct ethtool_drvinfo *info)
 834 {
 835         strcpy(info->driver, DRIVER_NAME);
 836 }
 837
 838 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 839 {
 840         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 841         return phy_ethtool_gset(priv->phydev, cmd);
 842 }
 843
 844 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 845 {
 846         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 847         return phy_ethtool_sset(priv->phydev, cmd);
 848 }
 849
 850 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
 851 {
 852         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 853         return priv->msg_enable;
 854 }
 855
 856 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
 857 {
 858         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 859         priv->msg_enable = level;
 860 }
 861
 862 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
 863         .get_drvinfo = mpc52xx_fec_get_drvinfo,
 864         .get_settings = mpc52xx_fec_get_settings,
 865         .set_settings = mpc52xx_fec_set_settings,
 866         .get_link = ethtool_op_get_link,
 867         .get_msglevel = mpc52xx_fec_get_msglevel,
 868         .set_msglevel = mpc52xx_fec_set_msglevel,
 869 };
 870
 871
 872 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 873 {
 874         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 875
 876         return mpc52xx_fec_phy_mii_ioctl(priv, if_mii(rq), cmd);
 877 }
 878
 879 /* ======================================================================== */
 880 /* OF Driver                                                                */
 881 /* ======================================================================== */
 882
 883 static int __devinit
 884 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
 885 {
 886         int rv;
 887         struct net_device *ndev;
 888         struct mpc52xx_fec_priv *priv = NULL;
 889         struct resource mem;
 890         struct device_node *phy_node;
 891         const phandle *phy_handle;
 892         const u32 *prop;
 893         int prop_size;
 894
 895         phys_addr_t rx_fifo;
 896         phys_addr_t tx_fifo;
 897
 898         /* Get the ether ndev & it's private zone */
 899         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
 900         if (!ndev)
 901                 return -ENOMEM;
 902
 903         priv = netdev_priv(ndev);
 904
 905         /* Reserve FEC control zone */
 906         rv = of_address_to_resource(op->node, 0, &mem);
 907         if (rv) {
 908                 printk(KERN_ERR DRIVER_NAME ": "
 909                                 "Error while parsing device node resource\n" );
 910                 return rv;
 911         }
 912         if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
 913                 printk(KERN_ERR DRIVER_NAME
 914                         " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
 915                         (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
 916                 return -EINVAL;
 917         }
 918
 919         if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
 920                 return -EBUSY;
 921
 922         /* Init ether ndev with what we have */
 923         ndev->open              = mpc52xx_fec_open;
 924         ndev->stop              = mpc52xx_fec_close;
 925         ndev->hard_start_xmit   = mpc52xx_fec_hard_start_xmit;
 926         ndev->do_ioctl          = mpc52xx_fec_ioctl;
 927         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
 928         ndev->get_stats         = mpc52xx_fec_get_stats;
 929         ndev->set_mac_address   = mpc52xx_fec_set_mac_address;
 930         ndev->set_multicast_list = mpc52xx_fec_set_multicast_list;
 931         ndev->tx_timeout        = mpc52xx_fec_tx_timeout;
 932         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
 933         ndev->base_addr         = mem.start;
 934
 935         priv->t_irq = priv->r_irq = ndev->irq = NO_IRQ; /* IRQ are free for now */
 936
 937         spin_lock_init(&priv->lock);
 938
 939         /* ioremap the zones */
 940         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
 941
 942         if (!priv->fec) {
 943                 rv = -ENOMEM;
 944                 goto probe_error;
 945         }
 946
 947         /* Bestcomm init */
 948         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
 949         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
 950
 951         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
 952         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
 953
 954         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
 955                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
 956                 rv = -ENOMEM;
 957                 goto probe_error;
 958         }
 959
 960         /* Get the IRQ we need one by one */
 961                 /* Control */
 962         ndev->irq = irq_of_parse_and_map(op->node, 0);
 963
 964                 /* RX */
 965         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
 966
 967                 /* TX */
 968         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
 969
 970         /* MAC address init */
 971         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
 972                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
 973         else
 974                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
 975
 976         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
 977
 978         /*
 979          * Link mode configuration
 980          */
 981
 982         /* Start with safe defaults for link connection */
 983         priv->phy_addr = FEC5200_PHYADDR_NONE;
 984         priv->speed = 100;
 985         priv->duplex = DUPLEX_HALF;
 986         priv->phy_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
 987
 988         /* the 7-wire property means don't use MII mode */
 989         if (of_find_property(op->node, "fsl,7-wire-mode", NULL))
 990                 priv->phy_addr = FEC5200_PHYADDR_7WIRE;
 991
 992         /* The current speed preconfigures the speed of the MII link */
 993         prop = of_get_property(op->node, "current-speed", &prop_size);
 994         if (prop && (prop_size >= sizeof(u32) * 2)) {
 995                 priv->speed = prop[0];
 996                 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
 997         }
 998
 999         /* If there is a phy handle, setup link to that phy */
1000         phy_handle = of_get_property(op->node, "phy-handle", &prop_size);
1001         if (phy_handle && (prop_size >= sizeof(phandle))) {
1002                 phy_node = of_find_node_by_phandle(*phy_handle);
1003                 prop = of_get_property(phy_node, "reg", &prop_size);
1004                 if (prop && (prop_size >= sizeof(u32)))
1005                         if ((*prop >= 0) && (*prop < PHY_MAX_ADDR))
1006                                 priv->phy_addr = *prop;
1007                 of_node_put(phy_node);
1008         }
1009
1010         /* Hardware init */
1011         mpc52xx_fec_hw_init(ndev);
1012
1013         mpc52xx_fec_reset_stats(ndev);
1014
1015         SET_NETDEV_DEV(ndev, &op->dev);
1016
1017         /* Register the new network device */
1018         rv = register_netdev(ndev);
1019         if (rv < 0)
1020                 goto probe_error;
1021
1022         /* Now report the link setup */
1023         switch (priv->phy_addr) {
1024          case FEC5200_PHYADDR_NONE:
1025                 dev_info(&ndev->dev, "Fixed speed MII link: %i%cD\n",
1026                          priv->speed, priv->duplex ? 'F' : 'H');
1027                 break;
1028          case FEC5200_PHYADDR_7WIRE:
1029                 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
1030                 break;
1031          default:
1032                 dev_info(&ndev->dev, "Using PHY at MDIO address %i\n",
1033                          priv->phy_addr);
1034         }
1035
1036         /* We're done ! */
1037         dev_set_drvdata(&op->dev, ndev);
1038
1039         return 0;
1040
1041
1042         /* Error handling - free everything that might be allocated */
1043 probe_error:
1044
1045         irq_dispose_mapping(ndev->irq);
1046
1047         if (priv->rx_dmatsk)
1048                 bcom_fec_rx_release(priv->rx_dmatsk);
1049         if (priv->tx_dmatsk)
1050                 bcom_fec_tx_release(priv->tx_dmatsk);
1051
1052         if (priv->fec)
1053                 iounmap(priv->fec);
1054
1055         release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
1056
1057         free_netdev(ndev);
1058
1059         return rv;
1060 }
1061
1062 static int
1063 mpc52xx_fec_remove(struct of_device *op)
1064 {
1065         struct net_device *ndev;
1066         struct mpc52xx_fec_priv *priv;
1067
1068         ndev = dev_get_drvdata(&op->dev);
1069         priv = netdev_priv(ndev);
1070
1071         unregister_netdev(ndev);
1072
1073         irq_dispose_mapping(ndev->irq);
1074
1075         bcom_fec_rx_release(priv->rx_dmatsk);
1076         bcom_fec_tx_release(priv->tx_dmatsk);
1077
1078         iounmap(priv->fec);
1079
1080         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1081
1082         free_netdev(ndev);
1083
1084         dev_set_drvdata(&op->dev, NULL);
1085         return 0;
1086 }
1087
1088 #ifdef CONFIG_PM
1089 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1090 {
1091         struct net_device *dev = dev_get_drvdata(&op->dev);
1092
1093         if (netif_running(dev))
1094                 mpc52xx_fec_close(dev);
1095
1096         return 0;
1097 }
1098
1099 static int mpc52xx_fec_of_resume(struct of_device *op)
1100 {
1101         struct net_device *dev = dev_get_drvdata(&op->dev);
1102
1103         mpc52xx_fec_hw_init(dev);
1104         mpc52xx_fec_reset_stats(dev);
1105
1106         if (netif_running(dev))
1107                 mpc52xx_fec_open(dev);
1108
1109         return 0;
1110 }
1111 #endif
1112
1113 static struct of_device_id mpc52xx_fec_match[] = {
1114         { .type = "network", .compatible = "fsl,mpc5200b-fec", },
1115         { .type = "network", .compatible = "fsl,mpc5200-fec", },
1116         { .type = "network", .compatible = "mpc5200-fec", },
1117         { }
1118 };
1119
1120 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1121
1122 static struct of_platform_driver mpc52xx_fec_driver = {
1123         .owner          = THIS_MODULE,
1124         .name           = DRIVER_NAME,
1125         .match_table    = mpc52xx_fec_match,
1126         .probe          = mpc52xx_fec_probe,
1127         .remove         = mpc52xx_fec_remove,
1128 #ifdef CONFIG_PM
1129         .suspend        = mpc52xx_fec_of_suspend,
1130         .resume         = mpc52xx_fec_of_resume,
1131 #endif
1132 };
1133
1134
1135 /* ======================================================================== */
1136 /* Module                                                                   */
1137 /* ======================================================================== */
1138
1139 static int __init
1140 mpc52xx_fec_init(void)
1141 {
1142 #ifdef CONFIG_FEC_MPC52xx_MDIO
1143         int ret;
1144         ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1145         if (ret) {
1146                 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1147                 return ret;
1148         }
1149 #endif
1150         return of_register_platform_driver(&mpc52xx_fec_driver);
1151 }
1152
1153 static void __exit
1154 mpc52xx_fec_exit(void)
1155 {
1156         of_unregister_platform_driver(&mpc52xx_fec_driver);
1157 #ifdef CONFIG_FEC_MPC52xx_MDIO
1158         of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1159 #endif
1160 }
1161
1162
1163 module_init(mpc52xx_fec_init);
1164 module_exit(mpc52xx_fec_exit);
1165
1166 MODULE_LICENSE("GPL");
1167 MODULE_AUTHOR("Dale Farnsworth");
1168 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");