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/dma-mapping.h>
  18 #include <linux/module.h>
  19
  20 #include <linux/kernel.h>
  21 #include <linux/types.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/slab.h>
  24 #include <linux/errno.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/crc32.h>
  28 #include <linux/hardirq.h>
  29 #include <linux/delay.h>
  30 #include <linux/of_device.h>
  31 #include <linux/of_mdio.h>
  32 #include <linux/of_platform.h>
  33
  34 #include <linux/netdevice.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/ethtool.h>
  37 #include <linux/skbuff.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/delay.h>
  41 #include <asm/mpc52xx.h>
  42
  43 #include <sysdev/bestcomm/bestcomm.h>
  44 #include <sysdev/bestcomm/fec.h>
  45
  46 #include "fec_mpc52xx.h"
  47
  48 #define DRIVER_NAME "mpc52xx-fec"
  49
  50 /* Private driver data structure */
  51 struct mpc52xx_fec_priv {
  52         struct net_device *ndev;
  53         int duplex;
  54         int speed;
  55         int r_irq;
  56         int t_irq;
  57         struct mpc52xx_fec __iomem *fec;
  58         struct bcom_task *rx_dmatsk;
  59         struct bcom_task *tx_dmatsk;
  60         spinlock_t lock;
  61         int msg_enable;
  62
  63         /* MDIO link details */
  64         unsigned int mdio_speed;
  65         struct device_node *phy_node;
  66         struct phy_device *phydev;
  67         enum phy_state link;
  68         int seven_wire_mode;
  69 };
  70
  71
  72 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
  73 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
  74 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
  75 static void mpc52xx_fec_stop(struct net_device *dev);
  76 static void mpc52xx_fec_start(struct net_device *dev);
  77 static void mpc52xx_fec_reset(struct net_device *dev);
  78
  79 static u8 mpc52xx_fec_mac_addr[6];
  80 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
  81 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
  82
  83 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
  84                 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
  85 static int debug = -1;  /* the above default */
  86 module_param(debug, int, 0);
  87 MODULE_PARM_DESC(debug, "debugging messages level");
  88
  89 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
  90 {
  91         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
  92         unsigned long flags;
  93
  94         dev_warn(&dev->dev, "transmit timed out\n");
  95
  96         spin_lock_irqsave(&priv->lock, flags);
  97         mpc52xx_fec_reset(dev);
  98         dev->stats.tx_errors++;
  99         spin_unlock_irqrestore(&priv->lock, flags);
 100
 101         netif_wake_queue(dev);
 102 }
 103
 104 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
 105 {
 106         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 107         struct mpc52xx_fec __iomem *fec = priv->fec;
 108
 109         out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
 110         out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
 111 }
 112
 113 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
 114 {
 115         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 116         struct mpc52xx_fec __iomem *fec = priv->fec;
 117
 118         *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
 119         *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
 120 }
 121
 122 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
 123 {
 124         struct sockaddr *sock = addr;
 125
 126         memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
 127
 128         mpc52xx_fec_set_paddr(dev, sock->sa_data);
 129         return 0;
 130 }
 131
 132 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
 133 {
 134         while (!bcom_queue_empty(s)) {
 135                 struct bcom_fec_bd *bd;
 136                 struct sk_buff *skb;
 137
 138                 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
 139                 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
 140                                  DMA_FROM_DEVICE);
 141                 kfree_skb(skb);
 142         }
 143 }
 144
 145 static void
 146 mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
 147 {
 148         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 149         struct bcom_fec_bd *bd;
 150
 151         bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
 152         bd->status = FEC_RX_BUFFER_SIZE;
 153         bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
 154                                     FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
 155         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
 156 }
 157
 158 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
 159 {
 160         struct sk_buff *skb;
 161
 162         while (!bcom_queue_full(rxtsk)) {
 163                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
 164                 if (!skb)
 165                         return -EAGAIN;
 166
 167                 /* zero out the initial receive buffers to aid debugging */
 168                 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
 169                 mpc52xx_fec_rx_submit(dev, skb);
 170         }
 171         return 0;
 172 }
 173
 174 /* based on generic_adjust_link from fs_enet-main.c */
 175 static void mpc52xx_fec_adjust_link(struct net_device *dev)
 176 {
 177         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 178         struct phy_device *phydev = priv->phydev;
 179         int new_state = 0;
 180
 181         if (phydev->link != PHY_DOWN) {
 182                 if (phydev->duplex != priv->duplex) {
 183                         struct mpc52xx_fec __iomem *fec = priv->fec;
 184                         u32 rcntrl;
 185                         u32 tcntrl;
 186
 187                         new_state = 1;
 188                         priv->duplex = phydev->duplex;
 189
 190                         rcntrl = in_be32(&fec->r_cntrl);
 191                         tcntrl = in_be32(&fec->x_cntrl);
 192
 193                         rcntrl &= ~FEC_RCNTRL_DRT;
 194                         tcntrl &= ~FEC_TCNTRL_FDEN;
 195                         if (phydev->duplex == DUPLEX_FULL)
 196                                 tcntrl |= FEC_TCNTRL_FDEN;      /* FD enable */
 197                         else
 198                                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 199
 200                         out_be32(&fec->r_cntrl, rcntrl);
 201                         out_be32(&fec->x_cntrl, tcntrl);
 202                 }
 203
 204                 if (phydev->speed != priv->speed) {
 205                         new_state = 1;
 206                         priv->speed = phydev->speed;
 207                 }
 208
 209                 if (priv->link == PHY_DOWN) {
 210                         new_state = 1;
 211                         priv->link = phydev->link;
 212                 }
 213
 214         } else if (priv->link) {
 215                 new_state = 1;
 216                 priv->link = PHY_DOWN;
 217                 priv->speed = 0;
 218                 priv->duplex = -1;
 219         }
 220
 221         if (new_state && netif_msg_link(priv))
 222                 phy_print_status(phydev);
 223 }
 224
 225 static int mpc52xx_fec_open(struct net_device *dev)
 226 {
 227         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 228         int err = -EBUSY;
 229
 230         if (priv->phy_node) {
 231                 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
 232                                               mpc52xx_fec_adjust_link, 0, 0);
 233                 if (!priv->phydev) {
 234                         dev_err(&dev->dev, "of_phy_connect failed\n");
 235                         return -ENODEV;
 236                 }
 237                 phy_start(priv->phydev);
 238         }
 239
 240         if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
 241                         DRIVER_NAME "_ctrl", dev)) {
 242                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
 243                 goto free_phy;
 244         }
 245         if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
 246                         DRIVER_NAME "_rx", dev)) {
 247                 dev_err(&dev->dev, "rx interrupt request failed\n");
 248                 goto free_ctrl_irq;
 249         }
 250         if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
 251                         DRIVER_NAME "_tx", dev)) {
 252                 dev_err(&dev->dev, "tx interrupt request failed\n");
 253                 goto free_2irqs;
 254         }
 255
 256         bcom_fec_rx_reset(priv->rx_dmatsk);
 257         bcom_fec_tx_reset(priv->tx_dmatsk);
 258
 259         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 260         if (err) {
 261                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
 262                 goto free_irqs;
 263         }
 264
 265         bcom_enable(priv->rx_dmatsk);
 266         bcom_enable(priv->tx_dmatsk);
 267
 268         mpc52xx_fec_start(dev);
 269
 270         netif_start_queue(dev);
 271
 272         return 0;
 273
 274  free_irqs:
 275         free_irq(priv->t_irq, dev);
 276  free_2irqs:
 277         free_irq(priv->r_irq, dev);
 278  free_ctrl_irq:
 279         free_irq(dev->irq, dev);
 280  free_phy:
 281         if (priv->phydev) {
 282                 phy_stop(priv->phydev);
 283                 phy_disconnect(priv->phydev);
 284                 priv->phydev = NULL;
 285         }
 286
 287         return err;
 288 }
 289
 290 static int mpc52xx_fec_close(struct net_device *dev)
 291 {
 292         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 293
 294         netif_stop_queue(dev);
 295
 296         mpc52xx_fec_stop(dev);
 297
 298         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 299
 300         free_irq(dev->irq, dev);
 301         free_irq(priv->r_irq, dev);
 302         free_irq(priv->t_irq, dev);
 303
 304         if (priv->phydev) {
 305                 /* power down phy */
 306                 phy_stop(priv->phydev);
 307                 phy_disconnect(priv->phydev);
 308                 priv->phydev = NULL;
 309         }
 310
 311         return 0;
 312 }
 313
 314 /* This will only be invoked if your driver is _not_ in XOFF state.
 315  * What this means is that you need not check it, and that this
 316  * invariant will hold if you make sure that the netif_*_queue()
 317  * calls are done at the proper times.
 318  */
 319 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
 320 {
 321         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 322         struct bcom_fec_bd *bd;
 323         unsigned long flags;
 324
 325         if (bcom_queue_full(priv->tx_dmatsk)) {
 326                 if (net_ratelimit())
 327                         dev_err(&dev->dev, "transmit queue overrun\n");
 328                 return NETDEV_TX_BUSY;
 329         }
 330
 331         spin_lock_irqsave(&priv->lock, flags);
 332
 333         bd = (struct bcom_fec_bd *)
 334                 bcom_prepare_next_buffer(priv->tx_dmatsk);
 335
 336         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
 337         bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
 338                                     DMA_TO_DEVICE);
 339
 340         skb_tx_timestamp(skb);
 341         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
 342         spin_unlock_irqrestore(&priv->lock, flags);
 343
 344         if (bcom_queue_full(priv->tx_dmatsk)) {
 345                 netif_stop_queue(dev);
 346         }
 347
 348         return NETDEV_TX_OK;
 349 }
 350
 351 #ifdef CONFIG_NET_POLL_CONTROLLER
 352 static void mpc52xx_fec_poll_controller(struct net_device *dev)
 353 {
 354         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 355
 356         disable_irq(priv->t_irq);
 357         mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
 358         enable_irq(priv->t_irq);
 359         disable_irq(priv->r_irq);
 360         mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
 361         enable_irq(priv->r_irq);
 362 }
 363 #endif
 364
 365
 366 /* This handles BestComm transmit task interrupts
 367  */
 368 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
 369 {
 370         struct net_device *dev = dev_id;
 371         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 372
 373         spin_lock(&priv->lock);
 374         while (bcom_buffer_done(priv->tx_dmatsk)) {
 375                 struct sk_buff *skb;
 376                 struct bcom_fec_bd *bd;
 377                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
 378                                 (struct bcom_bd **)&bd);
 379                 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
 380                                  DMA_TO_DEVICE);
 381
 382                 dev_kfree_skb_irq(skb);
 383         }
 384         spin_unlock(&priv->lock);
 385
 386         netif_wake_queue(dev);
 387
 388         return IRQ_HANDLED;
 389 }
 390
 391 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
 392 {
 393         struct net_device *dev = dev_id;
 394         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 395         struct sk_buff *rskb; /* received sk_buff */
 396         struct sk_buff *skb;  /* new sk_buff to enqueue in its place */
 397         struct bcom_fec_bd *bd;
 398         u32 status, physaddr;
 399         int length;
 400
 401         spin_lock(&priv->lock);
 402
 403         while (bcom_buffer_done(priv->rx_dmatsk)) {
 404
 405                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
 406                                             (struct bcom_bd **)&bd);
 407                 physaddr = bd->skb_pa;
 408
 409                 /* Test for errors in received frame */
 410                 if (status & BCOM_FEC_RX_BD_ERRORS) {
 411                         /* Drop packet and reuse the buffer */
 412                         mpc52xx_fec_rx_submit(dev, rskb);
 413                         dev->stats.rx_dropped++;
 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                         /* Can't get a new one : reuse the same & drop pkt */
 422                         dev_notice(&dev->dev, "Low memory - dropped packet.\n");
 423                         mpc52xx_fec_rx_submit(dev, rskb);
 424                         dev->stats.rx_dropped++;
 425                         continue;
 426                 }
 427
 428                 /* Enqueue the new sk_buff back on the hardware */
 429                 mpc52xx_fec_rx_submit(dev, skb);
 430
 431                 /* Process the received skb - Drop the spin lock while
 432                  * calling into the network stack */
 433                 spin_unlock(&priv->lock);
 434
 435                 dma_unmap_single(dev->dev.parent, physaddr, rskb->len,
 436                                  DMA_FROM_DEVICE);
 437                 length = status & BCOM_FEC_RX_BD_LEN_MASK;
 438                 skb_put(rskb, length - 4);      /* length without CRC32 */
 439                 rskb->protocol = eth_type_trans(rskb, dev);
 440                 if (!skb_defer_rx_timestamp(skb))
 441                         netif_rx(rskb);
 442
 443                 spin_lock(&priv->lock);
 444         }
 445
 446         spin_unlock(&priv->lock);
 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                 spin_lock(&priv->lock);
 475                 mpc52xx_fec_reset(dev);
 476                 spin_unlock(&priv->lock);
 477
 478                 return IRQ_HANDLED;
 479         }
 480
 481         if (ievent & ~FEC_IEVENT_TFINT)
 482                 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
 483
 484         return IRQ_HANDLED;
 485 }
 486
 487 /*
 488  * Get the current statistics.
 489  * This may be called with the card open or closed.
 490  */
 491 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
 492 {
 493         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 494         struct net_device_stats *stats = &dev->stats;
 495         struct mpc52xx_fec __iomem *fec = priv->fec;
 496
 497         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
 498         stats->rx_packets = in_be32(&fec->rmon_r_packets);
 499         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
 500                 in_be32(&fec->rmon_r_undersize) +
 501                 in_be32(&fec->rmon_r_oversize) +
 502                 in_be32(&fec->rmon_r_frag) +
 503                 in_be32(&fec->rmon_r_jab);
 504
 505         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
 506         stats->tx_packets = in_be32(&fec->rmon_t_packets);
 507         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
 508                 in_be32(&fec->rmon_t_undersize) +
 509                 in_be32(&fec->rmon_t_oversize) +
 510                 in_be32(&fec->rmon_t_frag) +
 511                 in_be32(&fec->rmon_t_jab);
 512
 513         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
 514         stats->collisions = in_be32(&fec->rmon_t_col);
 515
 516         /* detailed rx_errors: */
 517         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
 518                                         + in_be32(&fec->rmon_r_oversize)
 519                                         + in_be32(&fec->rmon_r_frag)
 520                                         + in_be32(&fec->rmon_r_jab);
 521         stats->rx_over_errors = in_be32(&fec->r_macerr);
 522         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
 523         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
 524         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
 525         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
 526
 527         /* detailed tx_errors: */
 528         stats->tx_aborted_errors = 0;
 529         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
 530         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
 531         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
 532         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
 533
 534         return stats;
 535 }
 536
 537 /*
 538  * Read MIB counters in order to reset them,
 539  * then zero all the stats fields in memory
 540  */
 541 static void mpc52xx_fec_reset_stats(struct net_device *dev)
 542 {
 543         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 544         struct mpc52xx_fec __iomem *fec = priv->fec;
 545
 546         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
 547         memset_io(&fec->rmon_t_drop, 0,
 548                    offsetof(struct mpc52xx_fec, reserved10) -
 549                    offsetof(struct mpc52xx_fec, rmon_t_drop));
 550         out_be32(&fec->mib_control, 0);
 551
 552         memset(&dev->stats, 0, sizeof(dev->stats));
 553 }
 554
 555 /*
 556  * Set or clear the multicast filter for this adaptor.
 557  */
 558 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
 559 {
 560         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 561         struct mpc52xx_fec __iomem *fec = priv->fec;
 562         u32 rx_control;
 563
 564         rx_control = in_be32(&fec->r_cntrl);
 565
 566         if (dev->flags & IFF_PROMISC) {
 567                 rx_control |= FEC_RCNTRL_PROM;
 568                 out_be32(&fec->r_cntrl, rx_control);
 569         } else {
 570                 rx_control &= ~FEC_RCNTRL_PROM;
 571                 out_be32(&fec->r_cntrl, rx_control);
 572
 573                 if (dev->flags & IFF_ALLMULTI) {
 574                         out_be32(&fec->gaddr1, 0xffffffff);
 575                         out_be32(&fec->gaddr2, 0xffffffff);
 576                 } else {
 577                         u32 crc;
 578                         struct netdev_hw_addr *ha;
 579                         u32 gaddr1 = 0x00000000;
 580                         u32 gaddr2 = 0x00000000;
 581
 582                         netdev_for_each_mc_addr(ha, dev) {
 583                                 crc = ether_crc_le(6, ha->addr) >> 26;
 584                                 if (crc >= 32)
 585                                         gaddr1 |= 1 << (crc-32);
 586                                 else
 587                                         gaddr2 |= 1 << crc;
 588                         }
 589                         out_be32(&fec->gaddr1, gaddr1);
 590                         out_be32(&fec->gaddr2, gaddr2);
 591                 }
 592         }
 593 }
 594
 595 /**
 596  * mpc52xx_fec_hw_init
 597  * @dev: network device
 598  *
 599  * Setup various hardware setting, only needed once on start
 600  */
 601 static void mpc52xx_fec_hw_init(struct net_device *dev)
 602 {
 603         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 604         struct mpc52xx_fec __iomem *fec = priv->fec;
 605         int i;
 606
 607         /* Whack a reset.  We should wait for this. */
 608         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
 609         for (i = 0; i < FEC_RESET_DELAY; ++i) {
 610                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
 611                         break;
 612                 udelay(1);
 613         }
 614         if (i == FEC_RESET_DELAY)
 615                 dev_err(&dev->dev, "FEC Reset timeout!\n");
 616
 617         /* set pause to 0x20 frames */
 618         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
 619
 620         /* high service request will be deasserted when there's < 7 bytes in fifo
 621          * low service request will be deasserted when there's < 4*7 bytes in fifo
 622          */
 623         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 624         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
 625
 626         /* alarm when <= x bytes in FIFO */
 627         out_be32(&fec->rfifo_alarm, 0x0000030c);
 628         out_be32(&fec->tfifo_alarm, 0x00000100);
 629
 630         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
 631         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
 632
 633         /* enable crc generation */
 634         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
 635         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
 636         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
 637
 638         /* set phy speed.
 639          * this can't be done in phy driver, since it needs to be called
 640          * before fec stuff (even on resume) */
 641         out_be32(&fec->mii_speed, priv->mdio_speed);
 642 }
 643
 644 /**
 645  * mpc52xx_fec_start
 646  * @dev: network device
 647  *
 648  * This function is called to start or restart the FEC during a link
 649  * change.  This happens on fifo errors or when switching between half
 650  * and full duplex.
 651  */
 652 static void mpc52xx_fec_start(struct net_device *dev)
 653 {
 654         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 655         struct mpc52xx_fec __iomem *fec = priv->fec;
 656         u32 rcntrl;
 657         u32 tcntrl;
 658         u32 tmp;
 659
 660         /* clear sticky error bits */
 661         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
 662         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
 663         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
 664
 665         /* FIFOs will reset on mpc52xx_fec_enable */
 666         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
 667
 668         /* Set station address. */
 669         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
 670
 671         mpc52xx_fec_set_multicast_list(dev);
 672
 673         /* set max frame len, enable flow control, select mii mode */
 674         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
 675         rcntrl |= FEC_RCNTRL_FCE;
 676
 677         if (!priv->seven_wire_mode)
 678                 rcntrl |= FEC_RCNTRL_MII_MODE;
 679
 680         if (priv->duplex == DUPLEX_FULL)
 681                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
 682         else {
 683                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
 684                 tcntrl = 0;
 685         }
 686         out_be32(&fec->r_cntrl, rcntrl);
 687         out_be32(&fec->x_cntrl, tcntrl);
 688
 689         /* Clear any outstanding interrupt. */
 690         out_be32(&fec->ievent, 0xffffffff);
 691
 692         /* Enable interrupts we wish to service. */
 693         out_be32(&fec->imask, FEC_IMASK_ENABLE);
 694
 695         /* And last, enable the transmit and receive processing. */
 696         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
 697         out_be32(&fec->r_des_active, 0x01000000);
 698 }
 699
 700 /**
 701  * mpc52xx_fec_stop
 702  * @dev: network device
 703  *
 704  * stop all activity on fec and empty dma buffers
 705  */
 706 static void mpc52xx_fec_stop(struct net_device *dev)
 707 {
 708         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 709         struct mpc52xx_fec __iomem *fec = priv->fec;
 710         unsigned long timeout;
 711
 712         /* disable all interrupts */
 713         out_be32(&fec->imask, 0);
 714
 715         /* Disable the rx task. */
 716         bcom_disable(priv->rx_dmatsk);
 717
 718         /* Wait for tx queue to drain, but only if we're in process context */
 719         if (!in_interrupt()) {
 720                 timeout = jiffies + msecs_to_jiffies(2000);
 721                 while (time_before(jiffies, timeout) &&
 722                                 !bcom_queue_empty(priv->tx_dmatsk))
 723                         msleep(100);
 724
 725                 if (time_after_eq(jiffies, timeout))
 726                         dev_err(&dev->dev, "queues didn't drain\n");
 727 #if 1
 728                 if (time_after_eq(jiffies, timeout)) {
 729                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
 730                                         priv->tx_dmatsk->index,
 731                                         priv->tx_dmatsk->outdex);
 732                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
 733                                         priv->rx_dmatsk->index,
 734                                         priv->rx_dmatsk->outdex);
 735                 }
 736 #endif
 737         }
 738
 739         bcom_disable(priv->tx_dmatsk);
 740
 741         /* Stop FEC */
 742         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
 743 }
 744
 745 /* reset fec and bestcomm tasks */
 746 static void mpc52xx_fec_reset(struct net_device *dev)
 747 {
 748         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 749         struct mpc52xx_fec __iomem *fec = priv->fec;
 750
 751         mpc52xx_fec_stop(dev);
 752
 753         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
 754         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
 755
 756         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
 757
 758         mpc52xx_fec_hw_init(dev);
 759
 760         bcom_fec_rx_reset(priv->rx_dmatsk);
 761         bcom_fec_tx_reset(priv->tx_dmatsk);
 762
 763         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
 764
 765         bcom_enable(priv->rx_dmatsk);
 766         bcom_enable(priv->tx_dmatsk);
 767
 768         mpc52xx_fec_start(dev);
 769
 770         netif_wake_queue(dev);
 771 }
 772
 773
 774 /* ethtool interface */
 775
 776 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 777 {
 778         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 779
 780         if (!priv->phydev)
 781                 return -ENODEV;
 782
 783         return phy_ethtool_gset(priv->phydev, cmd);
 784 }
 785
 786 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 787 {
 788         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 789
 790         if (!priv->phydev)
 791                 return -ENODEV;
 792
 793         return phy_ethtool_sset(priv->phydev, cmd);
 794 }
 795
 796 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
 797 {
 798         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 799         return priv->msg_enable;
 800 }
 801
 802 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
 803 {
 804         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 805         priv->msg_enable = level;
 806 }
 807
 808 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
 809         .get_settings = mpc52xx_fec_get_settings,
 810         .set_settings = mpc52xx_fec_set_settings,
 811         .get_link = ethtool_op_get_link,
 812         .get_msglevel = mpc52xx_fec_get_msglevel,
 813         .set_msglevel = mpc52xx_fec_set_msglevel,
 814 };
 815
 816
 817 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 818 {
 819         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
 820
 821         if (!priv->phydev)
 822                 return -ENOTSUPP;
 823
 824         return phy_mii_ioctl(priv->phydev, rq, cmd);
 825 }
 826
 827 static const struct net_device_ops mpc52xx_fec_netdev_ops = {
 828         .ndo_open = mpc52xx_fec_open,
 829         .ndo_stop = mpc52xx_fec_close,
 830         .ndo_start_xmit = mpc52xx_fec_start_xmit,
 831         .ndo_set_multicast_list = mpc52xx_fec_set_multicast_list,
 832         .ndo_set_mac_address = mpc52xx_fec_set_mac_address,
 833         .ndo_validate_addr = eth_validate_addr,
 834         .ndo_do_ioctl = mpc52xx_fec_ioctl,
 835         .ndo_change_mtu = eth_change_mtu,
 836         .ndo_tx_timeout = mpc52xx_fec_tx_timeout,
 837         .ndo_get_stats = mpc52xx_fec_get_stats,
 838 #ifdef CONFIG_NET_POLL_CONTROLLER
 839         .ndo_poll_controller = mpc52xx_fec_poll_controller,
 840 #endif
 841 };
 842
 843 /* ======================================================================== */
 844 /* OF Driver                                                                */
 845 /* ======================================================================== */
 846
 847 static int __devinit mpc52xx_fec_probe(struct platform_device *op)
 848 {
 849         int rv;
 850         struct net_device *ndev;
 851         struct mpc52xx_fec_priv *priv = NULL;
 852         struct resource mem;
 853         const u32 *prop;
 854         int prop_size;
 855
 856         phys_addr_t rx_fifo;
 857         phys_addr_t tx_fifo;
 858
 859         /* Get the ether ndev & it's private zone */
 860         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
 861         if (!ndev)
 862                 return -ENOMEM;
 863
 864         priv = netdev_priv(ndev);
 865         priv->ndev = ndev;
 866
 867         /* Reserve FEC control zone */
 868         rv = of_address_to_resource(op->dev.of_node, 0, &mem);
 869         if (rv) {
 870                 printk(KERN_ERR DRIVER_NAME ": "
 871                                 "Error while parsing device node resource\n" );
 872                 goto err_netdev;
 873         }
 874         if (resource_size(&mem) < sizeof(struct mpc52xx_fec)) {
 875                 printk(KERN_ERR DRIVER_NAME
 876                        " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
 877                        (unsigned long)resource_size(&mem),
 878                        sizeof(struct mpc52xx_fec));
 879                 rv = -EINVAL;
 880                 goto err_netdev;
 881         }
 882
 883         if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec),
 884                                 DRIVER_NAME)) {
 885                 rv = -EBUSY;
 886                 goto err_netdev;
 887         }
 888
 889         /* Init ether ndev with what we have */
 890         ndev->netdev_ops        = &mpc52xx_fec_netdev_ops;
 891         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
 892         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
 893         ndev->base_addr         = mem.start;
 894         SET_NETDEV_DEV(ndev, &op->dev);
 895
 896         spin_lock_init(&priv->lock);
 897
 898         /* ioremap the zones */
 899         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
 900
 901         if (!priv->fec) {
 902                 rv = -ENOMEM;
 903                 goto err_mem_region;
 904         }
 905
 906         /* Bestcomm init */
 907         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
 908         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
 909
 910         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
 911         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
 912
 913         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
 914                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
 915                 rv = -ENOMEM;
 916                 goto err_rx_tx_dmatsk;
 917         }
 918
 919         /* Get the IRQ we need one by one */
 920                 /* Control */
 921         ndev->irq = irq_of_parse_and_map(op->dev.of_node, 0);
 922
 923                 /* RX */
 924         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
 925
 926                 /* TX */
 927         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
 928
 929         /* MAC address init */
 930         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
 931                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
 932         else
 933                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
 934
 935         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
 936
 937         /*
 938          * Link mode configuration
 939          */
 940
 941         /* Start with safe defaults for link connection */
 942         priv->speed = 100;
 943         priv->duplex = DUPLEX_HALF;
 944         priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->dev.of_node) >> 20) / 5) << 1;
 945
 946         /* The current speed preconfigures the speed of the MII link */
 947         prop = of_get_property(op->dev.of_node, "current-speed", &prop_size);
 948         if (prop && (prop_size >= sizeof(u32) * 2)) {
 949                 priv->speed = prop[0];
 950                 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
 951         }
 952
 953         /* If there is a phy handle, then get the PHY node */
 954         priv->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
 955
 956         /* the 7-wire property means don't use MII mode */
 957         if (of_find_property(op->dev.of_node, "fsl,7-wire-mode", NULL)) {
 958                 priv->seven_wire_mode = 1;
 959                 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
 960         }
 961
 962         /* Hardware init */
 963         mpc52xx_fec_hw_init(ndev);
 964         mpc52xx_fec_reset_stats(ndev);
 965
 966         rv = register_netdev(ndev);
 967         if (rv < 0)
 968                 goto err_node;
 969
 970         /* We're done ! */
 971         dev_set_drvdata(&op->dev, ndev);
 972
 973         return 0;
 974
 975 err_node:
 976         of_node_put(priv->phy_node);
 977         irq_dispose_mapping(ndev->irq);
 978 err_rx_tx_dmatsk:
 979         if (priv->rx_dmatsk)
 980                 bcom_fec_rx_release(priv->rx_dmatsk);
 981         if (priv->tx_dmatsk)
 982                 bcom_fec_tx_release(priv->tx_dmatsk);
 983         iounmap(priv->fec);
 984 err_mem_region:
 985         release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
 986 err_netdev:
 987         free_netdev(ndev);
 988
 989         return rv;
 990 }
 991
 992 static int
 993 mpc52xx_fec_remove(struct platform_device *op)
 994 {
 995         struct net_device *ndev;
 996         struct mpc52xx_fec_priv *priv;
 997
 998         ndev = dev_get_drvdata(&op->dev);
 999         priv = netdev_priv(ndev);
1000
1001         unregister_netdev(ndev);
1002
1003         if (priv->phy_node)
1004                 of_node_put(priv->phy_node);
1005         priv->phy_node = NULL;
1006
1007         irq_dispose_mapping(ndev->irq);
1008
1009         bcom_fec_rx_release(priv->rx_dmatsk);
1010         bcom_fec_tx_release(priv->tx_dmatsk);
1011
1012         iounmap(priv->fec);
1013
1014         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1015
1016         free_netdev(ndev);
1017
1018         dev_set_drvdata(&op->dev, NULL);
1019         return 0;
1020 }
1021
1022 #ifdef CONFIG_PM
1023 static int mpc52xx_fec_of_suspend(struct platform_device *op, pm_message_t state)
1024 {
1025         struct net_device *dev = dev_get_drvdata(&op->dev);
1026
1027         if (netif_running(dev))
1028                 mpc52xx_fec_close(dev);
1029
1030         return 0;
1031 }
1032
1033 static int mpc52xx_fec_of_resume(struct platform_device *op)
1034 {
1035         struct net_device *dev = dev_get_drvdata(&op->dev);
1036
1037         mpc52xx_fec_hw_init(dev);
1038         mpc52xx_fec_reset_stats(dev);
1039
1040         if (netif_running(dev))
1041                 mpc52xx_fec_open(dev);
1042
1043         return 0;
1044 }
1045 #endif
1046
1047 static struct of_device_id mpc52xx_fec_match[] = {
1048         { .compatible = "fsl,mpc5200b-fec", },
1049         { .compatible = "fsl,mpc5200-fec", },
1050         { .compatible = "mpc5200-fec", },
1051         { }
1052 };
1053
1054 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1055
1056 static struct platform_driver mpc52xx_fec_driver = {
1057         .driver = {
1058                 .name = DRIVER_NAME,
1059                 .owner = THIS_MODULE,
1060                 .of_match_table = mpc52xx_fec_match,
1061         },
1062         .probe          = mpc52xx_fec_probe,
1063         .remove         = mpc52xx_fec_remove,
1064 #ifdef CONFIG_PM
1065         .suspend        = mpc52xx_fec_of_suspend,
1066         .resume         = mpc52xx_fec_of_resume,
1067 #endif
1068 };
1069
1070
1071 /* ======================================================================== */
1072 /* Module                                                                   */
1073 /* ======================================================================== */
1074
1075 static int __init
1076 mpc52xx_fec_init(void)
1077 {
1078 #ifdef CONFIG_FEC_MPC52xx_MDIO
1079         int ret;
1080         ret = platform_driver_register(&mpc52xx_fec_mdio_driver);
1081         if (ret) {
1082                 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1083                 return ret;
1084         }
1085 #endif
1086         return platform_driver_register(&mpc52xx_fec_driver);
1087 }
1088
1089 static void __exit
1090 mpc52xx_fec_exit(void)
1091 {
1092         platform_driver_unregister(&mpc52xx_fec_driver);
1093 #ifdef CONFIG_FEC_MPC52xx_MDIO
1094         platform_driver_unregister(&mpc52xx_fec_mdio_driver);
1095 #endif
1096 }
1097
1098
1099 module_init(mpc52xx_fec_init);
1100 module_exit(mpc52xx_fec_exit);
1101
1102 MODULE_LICENSE("GPL");
1103 MODULE_AUTHOR("Dale Farnsworth");
1104 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");