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_mdio.h>
  29 #include <linux/of_platform.h>
  30
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/ethtool.h>
  34 #include <linux/skbuff.h>
  35
  36 #include <asm/io.h>
  37 #include <asm/delay.h>
  38 #include <asm/mpc52xx.h>
  39
  40 #include <sysdev/bestcomm/bestcomm.h>
  41 #include <sysdev/bestcomm/fec.h>
  42
  43 #include "fec_mpc52xx.h"
  44
  45 #define DRIVER_NAME "mpc52xx-fec"
  46
  47 /* Private driver data structure */
  48 struct mpc52xx_fec_priv {
  49         struct net_device *ndev;
  50         int duplex;
  51         int speed;
  52         int r_irq;
  53         int t_irq;
  54         struct mpc52xx_fec __iomem *fec;
  55         struct bcom_task *rx_dmatsk;
  56         struct bcom_task *tx_dmatsk;
  57         spinlock_t lock;
  58         int msg_enable;
  59
  60         /* MDIO link details */
  61         unsigned int mdio_speed;
  62         struct device_node *phy_node;
  63         struct phy_device *phydev;
  64         enum phy_state link;
  65         int seven_wire_mode;
  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.parent, bd->skb_pa, skb->len,
 133                                  DMA_FROM_DEVICE);
 134                 kfree_skb(skb);
 135         }
 136 }
 137
 138 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
 139 {
 140         while (!bcom_queue_full(rxtsk)) {
 141                 struct sk_buff *skb;
 142                 struct bcom_fec_bd *bd;
 143
 144                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 145                 if (skb == NULL)
 146                         return -EAGAIN;
 147
 148                 /* zero out the initial receive buffers to aid debugging */
 149                 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
 150
 151                 bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);
 152
 153                 bd->status = FEC_RX_BUFFER_SIZE;
 154                 bd->skb_pa = dma_map_single(dev->dev.parent, skb->data,
 155                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 156
 157                 bcom_submit_next_buffer(rxtsk, skb);
 158         }
 159
 160         return 0;
 161 }
 162
 163 /* based on generic_adjust_link from fs_enet-main.c */
 164 static void mpc52xx_fec_adjust_link(struct net_device *dev)
 165 {
 166         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 167         struct phy_device *phydev = priv->phydev;
 168         int new_state = 0;
 169
 170         if (phydev->link != PHY_DOWN) {
 171                 if (phydev->duplex != priv->duplex) {
 172                         struct mpc52xx_fec __iomem *fec = priv->fec;
 173                         u32 rcntrl;
 174                         u32 tcntrl;
 175
 176                         new_state = 1;
 177                         priv->duplex = phydev->duplex;
 178
 179                         rcntrl = in_be32(&fec->r_cntrl);
 180                         tcntrl = in_be32(&fec->x_cntrl);
 181
 182                         rcntrl &= ~FEC_RCNTRL_DRT;
 183                         tcntrl &= ~FEC_TCNTRL_FDEN;
 184                         if (phydev->duplex == DUPLEX_FULL)
 185                                 tcntrl |= FEC_TCNTRL_FDEN;      /* FD enable */
 186                         else
 187                                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 188
 189                         out_be32(&fec->r_cntrl, rcntrl);
 190                         out_be32(&fec->x_cntrl, tcntrl);
 191                 }
 192
 193                 if (phydev->speed != priv->speed) {
 194                         new_state = 1;
 195                         priv->speed = phydev->speed;
 196                 }
 197
 198                 if (priv->link == PHY_DOWN) {
 199                         new_state = 1;
 200                         priv->link = phydev->link;
 201                 }
 202
 203         } else if (priv->link) {
 204                 new_state = 1;
 205                 priv->link = PHY_DOWN;
 206                 priv->speed = 0;
 207                 priv->duplex = -1;
 208         }
 209
 210         if (new_state && netif_msg_link(priv))
 211                 phy_print_status(phydev);
 212 }
 213
 214 static int mpc52xx_fec_open(struct net_device *dev)
 215 {
 216         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 217         int err = -EBUSY;
 218
 219         if (priv->phy_node) {
 220                 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
 221                                               mpc52xx_fec_adjust_link, 0, 0);
 222                 if (!priv->phydev) {
 223                         dev_err(&dev->dev, "of_phy_connect failed\n");
 224                         return -ENODEV;
 225                 }
 226                 phy_start(priv->phydev);
 227         }
 228
 229         if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
 230                         DRIVER_NAME "_ctrl", dev)) {
 231                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
 232                 goto free_phy;
 233         }
 234         if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
 235                         DRIVER_NAME "_rx", dev)) {
 236                 dev_err(&dev->dev, "rx interrupt request failed\n");
 237                 goto free_ctrl_irq;
 238         }
 239         if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
 240                         DRIVER_NAME "_tx", dev)) {
 241                 dev_err(&dev->dev, "tx interrupt request failed\n");
 242                 goto free_2irqs;
 243         }
 244
 245         bcom_fec_rx_reset(priv->rx_dmatsk);
 246         bcom_fec_tx_reset(priv->tx_dmatsk);
 247
 248         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 249         if (err) {
 250                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
 251                 goto free_irqs;
 252         }
 253
 254         bcom_enable(priv->rx_dmatsk);
 255         bcom_enable(priv->tx_dmatsk);
 256
 257         mpc52xx_fec_start(dev);
 258
 259         netif_start_queue(dev);
 260
 261         return 0;
 262
 263  free_irqs:
 264         free_irq(priv->t_irq, dev);
 265  free_2irqs:
 266         free_irq(priv->r_irq, dev);
 267  free_ctrl_irq:
 268         free_irq(dev->irq, dev);
 269  free_phy:
 270         if (priv->phydev) {
 271                 phy_stop(priv->phydev);
 272                 phy_disconnect(priv->phydev);
 273                 priv->phydev = NULL;
 274         }
 275
 276         return err;
 277 }
 278
 279 static int mpc52xx_fec_close(struct net_device *dev)
 280 {
 281         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 282
 283         netif_stop_queue(dev);
 284
 285         mpc52xx_fec_stop(dev);
 286
 287         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 288
 289         free_irq(dev->irq, dev);
 290         free_irq(priv->r_irq, dev);
 291         free_irq(priv->t_irq, dev);
 292
 293         if (priv->phydev) {
 294                 /* power down phy */
 295                 phy_stop(priv->phydev);
 296                 phy_disconnect(priv->phydev);
 297                 priv->phydev = NULL;
 298         }
 299
 300         return 0;
 301 }
 302
 303 /* This will only be invoked if your driver is _not_ in XOFF state.
 304  * What this means is that you need not check it, and that this
 305  * invariant will hold if you make sure that the netif_*_queue()
 306  * calls are done at the proper times.
 307  */
 308 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 309 {
 310         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 311         struct bcom_fec_bd *bd;
 312         unsigned long flags;
 313
 314         if (bcom_queue_full(priv->tx_dmatsk)) {
 315                 if (net_ratelimit())
 316                         dev_err(&dev->dev, "transmit queue overrun\n");
 317                 return NETDEV_TX_BUSY;
 318         }
 319
 320         spin_lock_irqsave(&priv->lock, flags);
 321         dev->trans_start = jiffies;
 322
 323         bd = (struct bcom_fec_bd *)
 324                 bcom_prepare_next_buffer(priv->tx_dmatsk);
 325
 326         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
 327         bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
 328                                     DMA_TO_DEVICE);
 329
 330         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
 331
 332         if (bcom_queue_full(priv->tx_dmatsk)) {
 333                 netif_stop_queue(dev);
 334         }
 335
 336         spin_unlock_irqrestore(&priv->lock, flags);
 337
 338         return NETDEV_TX_OK;
 339 }
 340
 341 #ifdef CONFIG_NET_POLL_CONTROLLER
 342 static void mpc52xx_fec_poll_controller(struct net_device *dev)
 343 {
 344         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 345
 346         disable_irq(priv->t_irq);
 347         mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
 348         enable_irq(priv->t_irq);
 349         disable_irq(priv->r_irq);
 350         mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
 351         enable_irq(priv->r_irq);
 352 }
 353 #endif
 354
 355
 356 /* This handles BestComm transmit task interrupts
 357  */
 358 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
 359 {
 360         struct net_device *dev = dev_id;
 361         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 362
 363         spin_lock(&priv->lock);
 364
 365         while (bcom_buffer_done(priv->tx_dmatsk)) {
 366                 struct sk_buff *skb;
 367                 struct bcom_fec_bd *bd;
 368                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
 369                                 (struct bcom_bd **)&bd);
 370                 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
 371                                  DMA_TO_DEVICE);
 372
 373                 dev_kfree_skb_irq(skb);
 374         }
 375
 376         netif_wake_queue(dev);
 377
 378         spin_unlock(&priv->lock);
 379
 380         return IRQ_HANDLED;
 381 }
 382
 383 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
 384 {
 385         struct net_device *dev = dev_id;
 386         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 387
 388         while (bcom_buffer_done(priv->rx_dmatsk)) {
 389                 struct sk_buff *skb;
 390                 struct sk_buff *rskb;
 391                 struct bcom_fec_bd *bd;
 392                 u32 status;
 393
 394                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
 395                                 (struct bcom_bd **)&bd);
 396                 dma_unmap_single(dev->dev.parent, bd->skb_pa, rskb->len,
 397                                  DMA_FROM_DEVICE);
 398
 399                 /* Test for errors in received frame */
 400                 if (status & BCOM_FEC_RX_BD_ERRORS) {
 401                         /* Drop packet and reuse the buffer */
 402                         bd = (struct bcom_fec_bd *)
 403                                 bcom_prepare_next_buffer(priv->rx_dmatsk);
 404
 405                         bd->status = FEC_RX_BUFFER_SIZE;
 406                         bd->skb_pa = dma_map_single(dev->dev.parent,
 407                                         rskb->data,
 408                                         FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 409
 410                         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
 411
 412                         dev->stats.rx_dropped++;
 413
 414                         continue;
 415                 }
 416
 417                 /* skbs are allocated on open, so now we allocate a new one,
 418                  * and remove the old (with the packet) */
 419                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 420                 if (skb) {
 421                         /* Process the received skb */
 422                         int length = status & BCOM_FEC_RX_BD_LEN_MASK;
 423
 424                         skb_put(rskb, length - 4);      /* length without CRC32 */
 425
 426                         rskb->dev = dev;
 427                         rskb->protocol = eth_type_trans(rskb, dev);
 428
 429                         netif_rx(rskb);
 430                 } else {
 431                         /* Can't get a new one : reuse the same & drop pkt */
 432                         dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
 433                         dev->stats.rx_dropped++;
 434
 435                         skb = rskb;
 436                 }
 437
 438                 bd = (struct bcom_fec_bd *)
 439                         bcom_prepare_next_buffer(priv->rx_dmatsk);
 440
 441                 bd->status = FEC_RX_BUFFER_SIZE;
 442                 bd->skb_pa = dma_map_single(dev->dev.parent, skb->data,
 443                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 444
 445                 bcom_submit_next_buffer(priv->rx_dmatsk, skb);
 446         }
 447
 448         return IRQ_HANDLED;
 449 }
 450
 451 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
 452 {
 453         struct net_device *dev = dev_id;
 454         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 455         struct mpc52xx_fec __iomem *fec = priv->fec;
 456         u32 ievent;
 457
 458         ievent = in_be32(&fec->ievent);
 459
 460         ievent &= ~FEC_IEVENT_MII;      /* mii is handled separately */
 461         if (!ievent)
 462                 return IRQ_NONE;
 463
 464         out_be32(&fec->ievent, ievent);         /* clear pending events */
 465
 466         /* on fifo error, soft-reset fec */
 467         if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
 468
 469                 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
 470                         dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
 471                 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
 472                         dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
 473
 474                 mpc52xx_fec_reset(dev);
 475
 476                 netif_wake_queue(dev);
 477                 return IRQ_HANDLED;
 478         }
 479
 480         if (ievent & ~FEC_IEVENT_TFINT)
 481                 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
 482
 483         return IRQ_HANDLED;
 484 }
 485
 486 /*
 487  * Get the current statistics.
 488  * This may be called with the card open or closed.
 489  */
 490 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
 491 {
 492         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 493         struct net_device_stats *stats = &dev->stats;
 494         struct mpc52xx_fec __iomem *fec = priv->fec;
 495
 496         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
 497         stats->rx_packets = in_be32(&fec->rmon_r_packets);
 498         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
 499                 in_be32(&fec->rmon_r_undersize) +
 500                 in_be32(&fec->rmon_r_oversize) +
 501                 in_be32(&fec->rmon_r_frag) +
 502                 in_be32(&fec->rmon_r_jab);
 503
 504         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
 505         stats->tx_packets = in_be32(&fec->rmon_t_packets);
 506         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
 507                 in_be32(&fec->rmon_t_undersize) +
 508                 in_be32(&fec->rmon_t_oversize) +
 509                 in_be32(&fec->rmon_t_frag) +
 510                 in_be32(&fec->rmon_t_jab);
 511
 512         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
 513         stats->collisions = in_be32(&fec->rmon_t_col);
 514
 515         /* detailed rx_errors: */
 516         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
 517                                         + in_be32(&fec->rmon_r_oversize)
 518                                         + in_be32(&fec->rmon_r_frag)
 519                                         + in_be32(&fec->rmon_r_jab);
 520         stats->rx_over_errors = in_be32(&fec->r_macerr);
 521         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
 522         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
 523         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
 524         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
 525
 526         /* detailed tx_errors: */
 527         stats->tx_aborted_errors = 0;
 528         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
 529         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
 530         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
 531         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
 532
 533         return stats;
 534 }
 535
 536 /*
 537  * Read MIB counters in order to reset them,
 538  * then zero all the stats fields in memory
 539  */
 540 static void mpc52xx_fec_reset_stats(struct net_device *dev)
 541 {
 542         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 543         struct mpc52xx_fec __iomem *fec = priv->fec;
 544
 545         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
 546         memset_io(&fec->rmon_t_drop, 0,
 547                    offsetof(struct mpc52xx_fec, reserved10) -
 548                    offsetof(struct mpc52xx_fec, rmon_t_drop));
 549         out_be32(&fec->mib_control, 0);
 550
 551         memset(&dev->stats, 0, sizeof(dev->stats));
 552 }
 553
 554 /*
 555  * Set or clear the multicast filter for this adaptor.
 556  */
 557 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
 558 {
 559         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 560         struct mpc52xx_fec __iomem *fec = priv->fec;
 561         u32 rx_control;
 562
 563         rx_control = in_be32(&fec->r_cntrl);
 564
 565         if (dev->flags & IFF_PROMISC) {
 566                 rx_control |= FEC_RCNTRL_PROM;
 567                 out_be32(&fec->r_cntrl, rx_control);
 568         } else {
 569                 rx_control &= ~FEC_RCNTRL_PROM;
 570                 out_be32(&fec->r_cntrl, rx_control);
 571
 572                 if (dev->flags & IFF_ALLMULTI) {
 573                         out_be32(&fec->gaddr1, 0xffffffff);
 574                         out_be32(&fec->gaddr2, 0xffffffff);
 575                 } else {
 576                         u32 crc;
 577                         int i;
 578                         struct dev_mc_list *dmi;
 579                         u32 gaddr1 = 0x00000000;
 580                         u32 gaddr2 = 0x00000000;
 581
 582                         dmi = dev->mc_list;
 583                         for (i=0; i<dev->mc_count; i++) {
 584                                 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
 585                                 if (crc >= 32)
 586                                         gaddr1 |= 1 << (crc-32);
 587                                 else
 588                                         gaddr2 |= 1 << crc;
 589                                 dmi = dmi->next;
 590                         }
 591                         out_be32(&fec->gaddr1, gaddr1);
 592                         out_be32(&fec->gaddr2, gaddr2);
 593                 }
 594         }
 595 }
 596
 597 /**
 598  * mpc52xx_fec_hw_init
 599  * @dev: network device
 600  *
 601  * Setup various hardware setting, only needed once on start
 602  */
 603 static void mpc52xx_fec_hw_init(struct net_device *dev)
 604 {
 605         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 606         struct mpc52xx_fec __iomem *fec = priv->fec;
 607         int i;
 608
 609         /* Whack a reset.  We should wait for this. */
 610         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
 611         for (i = 0; i < FEC_RESET_DELAY; ++i) {
 612                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
 613                         break;
 614                 udelay(1);
 615         }
 616         if (i == FEC_RESET_DELAY)
 617                 dev_err(&dev->dev, "FEC Reset timeout!\n");
 618
 619         /* set pause to 0x20 frames */
 620         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
 621
 622         /* high service request will be deasserted when there's < 7 bytes in fifo
 623          * low service request will be deasserted when there's < 4*7 bytes in fifo
 624          */
 625         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 626         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 627
 628         /* alarm when <= x bytes in FIFO */
 629         out_be32(&fec->rfifo_alarm, 0x0000030c);
 630         out_be32(&fec->tfifo_alarm, 0x00000100);
 631
 632         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
 633         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
 634
 635         /* enable crc generation */
 636         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
 637         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
 638         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
 639
 640         /* set phy speed.
 641          * this can't be done in phy driver, since it needs to be called
 642          * before fec stuff (even on resume) */
 643         out_be32(&fec->mii_speed, priv->mdio_speed);
 644 }
 645
 646 /**
 647  * mpc52xx_fec_start
 648  * @dev: network device
 649  *
 650  * This function is called to start or restart the FEC during a link
 651  * change.  This happens on fifo errors or when switching between half
 652  * and full duplex.
 653  */
 654 static void mpc52xx_fec_start(struct net_device *dev)
 655 {
 656         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 657         struct mpc52xx_fec __iomem *fec = priv->fec;
 658         u32 rcntrl;
 659         u32 tcntrl;
 660         u32 tmp;
 661
 662         /* clear sticky error bits */
 663         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
 664         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
 665         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
 666
 667         /* FIFOs will reset on mpc52xx_fec_enable */
 668         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
 669
 670         /* Set station address. */
 671         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
 672
 673         mpc52xx_fec_set_multicast_list(dev);
 674
 675         /* set max frame len, enable flow control, select mii mode */
 676         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
 677         rcntrl |= FEC_RCNTRL_FCE;
 678
 679         if (!priv->seven_wire_mode)
 680                 rcntrl |= FEC_RCNTRL_MII_MODE;
 681
 682         if (priv->duplex == DUPLEX_FULL)
 683                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
 684         else {
 685                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 686                 tcntrl = 0;
 687         }
 688         out_be32(&fec->r_cntrl, rcntrl);
 689         out_be32(&fec->x_cntrl, tcntrl);
 690
 691         /* Clear any outstanding interrupt. */
 692         out_be32(&fec->ievent, 0xffffffff);
 693
 694         /* Enable interrupts we wish to service. */
 695         out_be32(&fec->imask, FEC_IMASK_ENABLE);
 696
 697         /* And last, enable the transmit and receive processing. */
 698         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
 699         out_be32(&fec->r_des_active, 0x01000000);
 700 }
 701
 702 /**
 703  * mpc52xx_fec_stop
 704  * @dev: network device
 705  *
 706  * stop all activity on fec and empty dma buffers
 707  */
 708 static void mpc52xx_fec_stop(struct net_device *dev)
 709 {
 710         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 711         struct mpc52xx_fec __iomem *fec = priv->fec;
 712         unsigned long timeout;
 713
 714         /* disable all interrupts */
 715         out_be32(&fec->imask, 0);
 716
 717         /* Disable the rx task. */
 718         bcom_disable(priv->rx_dmatsk);
 719
 720         /* Wait for tx queue to drain, but only if we're in process context */
 721         if (!in_interrupt()) {
 722                 timeout = jiffies + msecs_to_jiffies(2000);
 723                 while (time_before(jiffies, timeout) &&
 724                                 !bcom_queue_empty(priv->tx_dmatsk))
 725                         msleep(100);
 726
 727                 if (time_after_eq(jiffies, timeout))
 728                         dev_err(&dev->dev, "queues didn't drain\n");
 729 #if 1
 730                 if (time_after_eq(jiffies, timeout)) {
 731                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
 732                                         priv->tx_dmatsk->index,
 733                                         priv->tx_dmatsk->outdex);
 734                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
 735                                         priv->rx_dmatsk->index,
 736                                         priv->rx_dmatsk->outdex);
 737                 }
 738 #endif
 739         }
 740
 741         bcom_disable(priv->tx_dmatsk);
 742
 743         /* Stop FEC */
 744         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
 745 }
 746
 747 /* reset fec and bestcomm tasks */
 748 static void mpc52xx_fec_reset(struct net_device *dev)
 749 {
 750         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 751         struct mpc52xx_fec __iomem *fec = priv->fec;
 752
 753         mpc52xx_fec_stop(dev);
 754
 755         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
 756         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
 757
 758         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 759
 760         mpc52xx_fec_hw_init(dev);
 761
 762         bcom_fec_rx_reset(priv->rx_dmatsk);
 763         bcom_fec_tx_reset(priv->tx_dmatsk);
 764
 765         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 766
 767         bcom_enable(priv->rx_dmatsk);
 768         bcom_enable(priv->tx_dmatsk);
 769
 770         mpc52xx_fec_start(dev);
 771 }
 772
 773
 774 /* ethtool interface */
 775 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
 776                 struct ethtool_drvinfo *info)
 777 {
 778         strcpy(info->driver, DRIVER_NAME);
 779 }
 780
 781 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 782 {
 783         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 784
 785         if (!priv->phydev)
 786                 return -ENODEV;
 787
 788         return phy_ethtool_gset(priv->phydev, cmd);
 789 }
 790
 791 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 792 {
 793         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 794
 795         if (!priv->phydev)
 796                 return -ENODEV;
 797
 798         return phy_ethtool_sset(priv->phydev, cmd);
 799 }
 800
 801 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
 802 {
 803         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 804         return priv->msg_enable;
 805 }
 806
 807 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
 808 {
 809         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 810         priv->msg_enable = level;
 811 }
 812
 813 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
 814         .get_drvinfo = mpc52xx_fec_get_drvinfo,
 815         .get_settings = mpc52xx_fec_get_settings,
 816         .set_settings = mpc52xx_fec_set_settings,
 817         .get_link = ethtool_op_get_link,
 818         .get_msglevel = mpc52xx_fec_get_msglevel,
 819         .set_msglevel = mpc52xx_fec_set_msglevel,
 820 };
 821
 822
 823 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 824 {
 825         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 826
 827         if (!priv->phydev)
 828                 return -ENOTSUPP;
 829
 830         return phy_mii_ioctl(priv->phydev, if_mii(rq), cmd);
 831 }
 832
 833 static const struct net_device_ops mpc52xx_fec_netdev_ops = {
 834         .ndo_open = mpc52xx_fec_open,
 835         .ndo_stop = mpc52xx_fec_close,
 836         .ndo_start_xmit = mpc52xx_fec_start_xmit,
 837         .ndo_set_multicast_list = mpc52xx_fec_set_multicast_list,
 838         .ndo_set_mac_address = mpc52xx_fec_set_mac_address,
 839         .ndo_validate_addr = eth_validate_addr,
 840         .ndo_do_ioctl = mpc52xx_fec_ioctl,
 841         .ndo_change_mtu = eth_change_mtu,
 842         .ndo_tx_timeout = mpc52xx_fec_tx_timeout,
 843         .ndo_get_stats = mpc52xx_fec_get_stats,
 844 #ifdef CONFIG_NET_POLL_CONTROLLER
 845         .ndo_poll_controller = mpc52xx_fec_poll_controller,
 846 #endif
 847 };
 848
 849 /* ======================================================================== */
 850 /* OF Driver                                                                */
 851 /* ======================================================================== */
 852
 853 static int __devinit
 854 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
 855 {
 856         int rv;
 857         struct net_device *ndev;
 858         struct mpc52xx_fec_priv *priv = NULL;
 859         struct resource mem;
 860         const u32 *prop;
 861         int prop_size;
 862
 863         phys_addr_t rx_fifo;
 864         phys_addr_t tx_fifo;
 865
 866         /* Get the ether ndev & it's private zone */
 867         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
 868         if (!ndev)
 869                 return -ENOMEM;
 870
 871         priv = netdev_priv(ndev);
 872         priv->ndev = ndev;
 873
 874         /* Reserve FEC control zone */
 875         rv = of_address_to_resource(op->node, 0, &mem);
 876         if (rv) {
 877                 printk(KERN_ERR DRIVER_NAME ": "
 878                                 "Error while parsing device node resource\n" );
 879                 return rv;
 880         }
 881         if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
 882                 printk(KERN_ERR DRIVER_NAME
 883                         " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
 884                         (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
 885                 return -EINVAL;
 886         }
 887
 888         if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
 889                 return -EBUSY;
 890
 891         /* Init ether ndev with what we have */
 892         ndev->netdev_ops        = &mpc52xx_fec_netdev_ops;
 893         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
 894         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
 895         ndev->base_addr         = mem.start;
 896         SET_NETDEV_DEV(ndev, &op->dev);
 897
 898         spin_lock_init(&priv->lock);
 899
 900         /* ioremap the zones */
 901         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
 902
 903         if (!priv->fec) {
 904                 rv = -ENOMEM;
 905                 goto probe_error;
 906         }
 907
 908         /* Bestcomm init */
 909         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
 910         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
 911
 912         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
 913         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
 914
 915         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
 916                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
 917                 rv = -ENOMEM;
 918                 goto probe_error;
 919         }
 920
 921         /* Get the IRQ we need one by one */
 922                 /* Control */
 923         ndev->irq = irq_of_parse_and_map(op->node, 0);
 924
 925                 /* RX */
 926         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
 927
 928                 /* TX */
 929         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
 930
 931         /* MAC address init */
 932         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
 933                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
 934         else
 935                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
 936
 937         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
 938
 939         /*
 940          * Link mode configuration
 941          */
 942
 943         /* Start with safe defaults for link connection */
 944         priv->speed = 100;
 945         priv->duplex = DUPLEX_HALF;
 946         priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->node) >> 20) / 5) << 1;
 947
 948         /* The current speed preconfigures the speed of the MII link */
 949         prop = of_get_property(op->node, "current-speed", &prop_size);
 950         if (prop && (prop_size >= sizeof(u32) * 2)) {
 951                 priv->speed = prop[0];
 952                 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
 953         }
 954
 955         /* If there is a phy handle, then get the PHY node */
 956         priv->phy_node = of_parse_phandle(op->node, "phy-handle", 0);
 957
 958         /* the 7-wire property means don't use MII mode */
 959         if (of_find_property(op->node, "fsl,7-wire-mode", NULL)) {
 960                 priv->seven_wire_mode = 1;
 961                 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
 962         }
 963
 964         /* Hardware init */
 965         mpc52xx_fec_hw_init(ndev);
 966         mpc52xx_fec_reset_stats(ndev);
 967
 968         rv = register_netdev(ndev);
 969         if (rv < 0)
 970                 goto probe_error;
 971
 972         /* We're done ! */
 973         dev_set_drvdata(&op->dev, ndev);
 974
 975         return 0;
 976
 977
 978         /* Error handling - free everything that might be allocated */
 979 probe_error:
 980
 981         if (priv->phy_node)
 982                 of_node_put(priv->phy_node);
 983         priv->phy_node = NULL;
 984
 985         irq_dispose_mapping(ndev->irq);
 986
 987         if (priv->rx_dmatsk)
 988                 bcom_fec_rx_release(priv->rx_dmatsk);
 989         if (priv->tx_dmatsk)
 990                 bcom_fec_tx_release(priv->tx_dmatsk);
 991
 992         if (priv->fec)
 993                 iounmap(priv->fec);
 994
 995         release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
 996
 997         free_netdev(ndev);
 998
 999         return rv;
1000 }
1001
1002 static int
1003 mpc52xx_fec_remove(struct of_device *op)
1004 {
1005         struct net_device *ndev;
1006         struct mpc52xx_fec_priv *priv;
1007
1008         ndev = dev_get_drvdata(&op->dev);
1009         priv = netdev_priv(ndev);
1010
1011         unregister_netdev(ndev);
1012
1013         if (priv->phy_node)
1014                 of_node_put(priv->phy_node);
1015         priv->phy_node = NULL;
1016
1017         irq_dispose_mapping(ndev->irq);
1018
1019         bcom_fec_rx_release(priv->rx_dmatsk);
1020         bcom_fec_tx_release(priv->tx_dmatsk);
1021
1022         iounmap(priv->fec);
1023
1024         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1025
1026         free_netdev(ndev);
1027
1028         dev_set_drvdata(&op->dev, NULL);
1029         return 0;
1030 }
1031
1032 #ifdef CONFIG_PM
1033 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1034 {
1035         struct net_device *dev = dev_get_drvdata(&op->dev);
1036
1037         if (netif_running(dev))
1038                 mpc52xx_fec_close(dev);
1039
1040         return 0;
1041 }
1042
1043 static int mpc52xx_fec_of_resume(struct of_device *op)
1044 {
1045         struct net_device *dev = dev_get_drvdata(&op->dev);
1046
1047         mpc52xx_fec_hw_init(dev);
1048         mpc52xx_fec_reset_stats(dev);
1049
1050         if (netif_running(dev))
1051                 mpc52xx_fec_open(dev);
1052
1053         return 0;
1054 }
1055 #endif
1056
1057 static struct of_device_id mpc52xx_fec_match[] = {
1058         { .compatible = "fsl,mpc5200b-fec", },
1059         { .compatible = "fsl,mpc5200-fec", },
1060         { .compatible = "mpc5200-fec", },
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");