drivers/net/fec_8xx/fec_main.c

   1 /*
   2  * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx.
   3  *
   4  * Copyright (c) 2003 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
   8  * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
   9  *
  10  * Released under the GPL
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/sched.h>
  18 #include <linux/string.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/errno.h>
  21 #include <linux/ioport.h>
  22 #include <linux/slab.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/pci.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/mii.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/bitops.h>
  34
  35 #include <asm/8xx_immap.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/mpc8xx.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/commproc.h>
  41 #include <asm/dma-mapping.h>
  42
  43 #include "fec_8xx.h"
  44
  45 /*************************************************/
  46
  47 #define FEC_MAX_MULTICAST_ADDRS 64
  48
  49 /*************************************************/
  50
  51 static char version[] __devinitdata =
  52     DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";
  53
  54 MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  55 MODULE_DESCRIPTION("Motorola 8xx FEC ethernet driver");
  56 MODULE_LICENSE("GPL");
  57
  58 MODULE_PARM(fec_8xx_debug, "i");
  59 MODULE_PARM_DESC(fec_8xx_debug,
  60                  "FEC 8xx bitmapped debugging message enable value");
  61
  62 int fec_8xx_debug = -1;         /* -1 == use FEC_8XX_DEF_MSG_ENABLE as value */
  63
  64 /*************************************************/
  65
  66 /*
  67  * Delay to wait for FEC reset command to complete (in us)
  68  */
  69 #define FEC_RESET_DELAY         50
  70
  71 /*****************************************************************************************/
  72
  73 static void fec_whack_reset(fec_t * fecp)
  74 {
  75         int i;
  76
  77         /*
  78          * Whack a reset.  We should wait for this.
  79          */
  80         FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
  81         for (i = 0;
  82              (FR(fecp, ecntrl) & FEC_ECNTRL_RESET) != 0 && i < FEC_RESET_DELAY;
  83              i++)
  84                 udelay(1);
  85
  86         if (i == FEC_RESET_DELAY)
  87                 printk(KERN_WARNING "FEC Reset timeout!\n");
  88
  89 }
  90
  91 /****************************************************************************/
  92
  93 /*
  94  * Transmitter timeout.
  95  */
  96 #define TX_TIMEOUT (2*HZ)
  97
  98 /****************************************************************************/
  99
 100 /*
 101  * Returns the CRC needed when filling in the hash table for
 102  * multicast group filtering
 103  * pAddr must point to a MAC address (6 bytes)
 104  */
 105 static __u32 fec_mulicast_calc_crc(char *pAddr)
 106 {
 107         u8 byte;
 108         int byte_count;
 109         int bit_count;
 110         __u32 crc = 0xffffffff;
 111         u8 msb;
 112
 113         for (byte_count = 0; byte_count < 6; byte_count++) {
 114                 byte = pAddr[byte_count];
 115                 for (bit_count = 0; bit_count < 8; bit_count++) {
 116                         msb = crc >> 31;
 117                         crc <<= 1;
 118                         if (msb ^ (byte & 0x1)) {
 119                                 crc ^= FEC_CRC_POLY;
 120                         }
 121                         byte >>= 1;
 122                 }
 123         }
 124         return (crc);
 125 }
 126
 127 /*
 128  * Set or clear the multicast filter for this adaptor.
 129  * Skeleton taken from sunlance driver.
 130  * The CPM Ethernet implementation allows Multicast as well as individual
 131  * MAC address filtering.  Some of the drivers check to make sure it is
 132  * a group multicast address, and discard those that are not.  I guess I
 133  * will do the same for now, but just remove the test if you want
 134  * individual filtering as well (do the upper net layers want or support
 135  * this kind of feature?).
 136  */
 137 static void fec_set_multicast_list(struct net_device *dev)
 138 {
 139         struct fec_enet_private *fep = netdev_priv(dev);
 140         fec_t *fecp = fep->fecp;
 141         struct dev_mc_list *pmc;
 142         __u32 crc;
 143         int temp;
 144         __u32 csrVal;
 145         int hash_index;
 146         __u32 hthi, htlo;
 147         unsigned long flags;
 148
 149
 150         if ((dev->flags & IFF_PROMISC) != 0) {
 151
 152                 spin_lock_irqsave(&fep->lock, flags);
 153                 FS(fecp, r_cntrl, FEC_RCNTRL_PROM);
 154                 spin_unlock_irqrestore(&fep->lock, flags);
 155
 156                 /*
 157                  * Log any net taps.
 158                  */
 159                 printk(KERN_WARNING DRV_MODULE_NAME
 160                        ": %s: Promiscuous mode enabled.\n", dev->name);
 161                 return;
 162
 163         }
 164
 165         if ((dev->flags & IFF_ALLMULTI) != 0 ||
 166             dev->mc_count > FEC_MAX_MULTICAST_ADDRS) {
 167                 /*
 168                  * Catch all multicast addresses, set the filter to all 1's.
 169                  */
 170                 hthi = 0xffffffffU;
 171                 htlo = 0xffffffffU;
 172         } else {
 173                 hthi = 0;
 174                 htlo = 0;
 175
 176                 /*
 177                  * Now populate the hash table
 178                  */
 179                 for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next) {
 180                         crc = fec_mulicast_calc_crc(pmc->dmi_addr);
 181                         temp = (crc & 0x3f) >> 1;
 182                         hash_index = ((temp & 0x01) << 4) |
 183                                      ((temp & 0x02) << 2) |
 184                                      ((temp & 0x04)) |
 185                                      ((temp & 0x08) >> 2) |
 186                                      ((temp & 0x10) >> 4);
 187                         csrVal = (1 << hash_index);
 188                         if (crc & 1)
 189                                 hthi |= csrVal;
 190                         else
 191                                 htlo |= csrVal;
 192                 }
 193         }
 194
 195         spin_lock_irqsave(&fep->lock, flags);
 196         FC(fecp, r_cntrl, FEC_RCNTRL_PROM);
 197         FW(fecp, hash_table_high, hthi);
 198         FW(fecp, hash_table_low, htlo);
 199         spin_unlock_irqrestore(&fep->lock, flags);
 200 }
 201
 202 static int fec_set_mac_address(struct net_device *dev, void *addr)
 203 {
 204         struct sockaddr *mac = addr;
 205         struct fec_enet_private *fep = netdev_priv(dev);
 206         struct fec *fecp = fep->fecp;
 207         int i;
 208         __u32 addrhi, addrlo;
 209         unsigned long flags;
 210
 211         /* Get pointer to SCC area in parameter RAM. */
 212         for (i = 0; i < 6; i++)
 213                 dev->dev_addr[i] = mac->sa_data[i];
 214
 215         /*
 216          * Set station address.
 217          */
 218         addrhi = ((__u32) dev->dev_addr[0] << 24) |
 219                  ((__u32) dev->dev_addr[1] << 16) |
 220                  ((__u32) dev->dev_addr[2] <<  8) |
 221                   (__u32) dev->dev_addr[3];
 222         addrlo = ((__u32) dev->dev_addr[4] << 24) |
 223                  ((__u32) dev->dev_addr[5] << 16);
 224
 225         spin_lock_irqsave(&fep->lock, flags);
 226         FW(fecp, addr_low, addrhi);
 227         FW(fecp, addr_high, addrlo);
 228         spin_unlock_irqrestore(&fep->lock, flags);
 229
 230         return 0;
 231 }
 232
 233 /*
 234  * This function is called to start or restart the FEC during a link
 235  * change.  This only happens when switching between half and full
 236  * duplex.
 237  */
 238 void fec_restart(struct net_device *dev, int duplex, int speed)
 239 {
 240 #ifdef CONFIG_DUET
 241         immap_t *immap = (immap_t *) IMAP_ADDR;
 242         __u32 cptr;
 243 #endif
 244         struct fec_enet_private *fep = netdev_priv(dev);
 245         struct fec *fecp = fep->fecp;
 246         const struct fec_platform_info *fpi = fep->fpi;
 247         cbd_t *bdp;
 248         struct sk_buff *skb;
 249         int i;
 250         __u32 addrhi, addrlo;
 251
 252         fec_whack_reset(fep->fecp);
 253
 254         /*
 255          * Set station address.
 256          */
 257         addrhi = ((__u32) dev->dev_addr[0] << 24) |
 258                  ((__u32) dev->dev_addr[1] << 16) |
 259                  ((__u32) dev->dev_addr[2] <<  8) |
 260                  (__u32) dev->dev_addr[3];
 261         addrlo = ((__u32) dev->dev_addr[4] << 24) |
 262                  ((__u32) dev->dev_addr[5] << 16);
 263         FW(fecp, addr_low, addrhi);
 264         FW(fecp, addr_high, addrlo);
 265
 266         /*
 267          * Reset all multicast.
 268          */
 269         FW(fecp, hash_table_high, 0);
 270         FW(fecp, hash_table_low, 0);
 271
 272         /*
 273          * Set maximum receive buffer size.
 274          */
 275         FW(fecp, r_buff_size, PKT_MAXBLR_SIZE);
 276         FW(fecp, r_hash, PKT_MAXBUF_SIZE);
 277
 278         /*
 279          * Set receive and transmit descriptor base.
 280          */
 281         FW(fecp, r_des_start, iopa((__u32) (fep->rx_bd_base)));
 282         FW(fecp, x_des_start, iopa((__u32) (fep->tx_bd_base)));
 283
 284         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 285         fep->tx_free = fep->tx_ring;
 286         fep->cur_rx = fep->rx_bd_base;
 287
 288         /*
 289          * Reset SKB receive buffers
 290          */
 291         for (i = 0; i < fep->rx_ring; i++) {
 292                 if ((skb = fep->rx_skbuff[i]) == NULL)
 293                         continue;
 294                 fep->rx_skbuff[i] = NULL;
 295                 dev_kfree_skb(skb);
 296         }
 297
 298         /*
 299          * Initialize the receive buffer descriptors.
 300          */
 301         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 302                 skb = dev_alloc_skb(ENET_RX_FRSIZE);
 303                 if (skb == NULL) {
 304                         printk(KERN_WARNING DRV_MODULE_NAME
 305                                ": %s Memory squeeze, unable to allocate skb\n",
 306                                dev->name);
 307                         fep->stats.rx_dropped++;
 308                         break;
 309                 }
 310                 fep->rx_skbuff[i] = skb;
 311                 skb->dev = dev;
 312                 CBDW_BUFADDR(bdp, dma_map_single(NULL, skb->data,
 313                                          L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 314                                          DMA_FROM_DEVICE));
 315                 CBDW_DATLEN(bdp, 0);    /* zero */
 316                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 317                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 318         }
 319         /*
 320          * if we failed, fillup remainder
 321          */
 322         for (; i < fep->rx_ring; i++, bdp++) {
 323                 fep->rx_skbuff[i] = NULL;
 324                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 325         }
 326
 327         /*
 328          * Reset SKB transmit buffers.
 329          */
 330         for (i = 0; i < fep->tx_ring; i++) {
 331                 if ((skb = fep->tx_skbuff[i]) == NULL)
 332                         continue;
 333                 fep->tx_skbuff[i] = NULL;
 334                 dev_kfree_skb(skb);
 335         }
 336
 337         /*
 338          * ...and the same for transmit.
 339          */
 340         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 341                 fep->tx_skbuff[i] = NULL;
 342                 CBDW_BUFADDR(bdp, virt_to_bus(NULL));
 343                 CBDW_DATLEN(bdp, 0);
 344                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 345         }
 346
 347         /*
 348          * Enable big endian and don't care about SDMA FC.
 349          */
 350         FW(fecp, fun_code, 0x78000000);
 351
 352         /*
 353          * Set MII speed.
 354          */
 355         FW(fecp, mii_speed, fep->fec_phy_speed);
 356
 357         /*
 358          * Clear any outstanding interrupt.
 359          */
 360         FW(fecp, ievent, 0xffc0);
 361         FW(fecp, ivec, (fpi->fec_irq / 2) << 29);
 362
 363         /*
 364          * adjust to speed (only for DUET & RMII)
 365          */
 366 #ifdef CONFIG_DUET
 367         cptr = in_be32(&immap->im_cpm.cp_cptr);
 368         switch (fpi->fec_no) {
 369         case 0:
 370                 /*
 371                  * check if in RMII mode
 372                  */
 373                 if ((cptr & 0x100) == 0)
 374                         break;
 375
 376                 if (speed == 10)
 377                         cptr |= 0x0000010;
 378                 else if (speed == 100)
 379                         cptr &= ~0x0000010;
 380                 break;
 381         case 1:
 382                 /*
 383                  * check if in RMII mode
 384                  */
 385                 if ((cptr & 0x80) == 0)
 386                         break;
 387
 388                 if (speed == 10)
 389                         cptr |= 0x0000008;
 390                 else if (speed == 100)
 391                         cptr &= ~0x0000008;
 392                 break;
 393         default:
 394                 break;
 395         }
 396         out_be32(&immap->im_cpm.cp_cptr, cptr);
 397 #endif
 398
 399         FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
 400         /*
 401          * adjust to duplex mode
 402          */
 403         if (duplex) {
 404                 FC(fecp, r_cntrl, FEC_RCNTRL_DRT);
 405                 FS(fecp, x_cntrl, FEC_TCNTRL_FDEN);     /* FD enable */
 406         } else {
 407                 FS(fecp, r_cntrl, FEC_RCNTRL_DRT);
 408                 FC(fecp, x_cntrl, FEC_TCNTRL_FDEN);     /* FD disable */
 409         }
 410
 411         /*
 412          * Enable interrupts we wish to service.
 413          */
 414         FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB |
 415            FEC_ENET_RXF | FEC_ENET_RXB);
 416
 417         /*
 418          * And last, enable the transmit and receive processing.
 419          */
 420         FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 421         FW(fecp, r_des_active, 0x01000000);
 422 }
 423
 424 void fec_stop(struct net_device *dev)
 425 {
 426         struct fec_enet_private *fep = netdev_priv(dev);
 427         fec_t *fecp = fep->fecp;
 428         struct sk_buff *skb;
 429         int i;
 430
 431         if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0)
 432                 return;         /* already down */
 433
 434         FW(fecp, x_cntrl, 0x01);        /* Graceful transmit stop */
 435         for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) &&
 436              i < FEC_RESET_DELAY; i++)
 437                 udelay(1);
 438
 439         if (i == FEC_RESET_DELAY)
 440                 printk(KERN_WARNING DRV_MODULE_NAME
 441                        ": %s FEC timeout on graceful transmit stop\n",
 442                        dev->name);
 443         /*
 444          * Disable FEC. Let only MII interrupts.
 445          */
 446         FW(fecp, imask, 0);
 447         FW(fecp, ecntrl, ~FEC_ECNTRL_ETHER_EN);
 448
 449         /*
 450          * Reset SKB transmit buffers.
 451          */
 452         for (i = 0; i < fep->tx_ring; i++) {
 453                 if ((skb = fep->tx_skbuff[i]) == NULL)
 454                         continue;
 455                 fep->tx_skbuff[i] = NULL;
 456                 dev_kfree_skb(skb);
 457         }
 458
 459         /*
 460          * Reset SKB receive buffers
 461          */
 462         for (i = 0; i < fep->rx_ring; i++) {
 463                 if ((skb = fep->rx_skbuff[i]) == NULL)
 464                         continue;
 465                 fep->rx_skbuff[i] = NULL;
 466                 dev_kfree_skb(skb);
 467         }
 468 }
 469
 470 /* common receive function */
 471 static int fec_enet_rx_common(struct net_device *dev, int *budget)
 472 {
 473         struct fec_enet_private *fep = netdev_priv(dev);
 474         fec_t *fecp = fep->fecp;
 475         const struct fec_platform_info *fpi = fep->fpi;
 476         cbd_t *bdp;
 477         struct sk_buff *skb, *skbn, *skbt;
 478         int received = 0;
 479         __u16 pkt_len, sc;
 480         int curidx;
 481         int rx_work_limit;
 482
 483         if (fpi->use_napi) {
 484                 rx_work_limit = min(dev->quota, *budget);
 485
 486                 if (!netif_running(dev))
 487                         return 0;
 488         }
 489
 490         /*
 491          * First, grab all of the stats for the incoming packet.
 492          * These get messed up if we get called due to a busy condition.
 493          */
 494         bdp = fep->cur_rx;
 495
 496         /* clear RX status bits for napi*/
 497         if (fpi->use_napi)
 498                 FW(fecp, ievent, FEC_ENET_RXF | FEC_ENET_RXB);
 499
 500         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 501
 502                 curidx = bdp - fep->rx_bd_base;
 503
 504                 /*
 505                  * Since we have allocated space to hold a complete frame,
 506                  * the last indicator should be set.
 507                  */
 508                 if ((sc & BD_ENET_RX_LAST) == 0)
 509                         printk(KERN_WARNING DRV_MODULE_NAME
 510                                ": %s rcv is not +last\n",
 511                                dev->name);
 512
 513                 /*
 514                  * Check for errors.
 515                  */
 516                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 517                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 518                         fep->stats.rx_errors++;
 519                         /* Frame too long or too short. */
 520                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 521                                 fep->stats.rx_length_errors++;
 522                         /* Frame alignment */
 523                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 524                                 fep->stats.rx_frame_errors++;
 525                         /* CRC Error */
 526                         if (sc & BD_ENET_RX_CR)
 527                                 fep->stats.rx_crc_errors++;
 528                         /* FIFO overrun */
 529                         if (sc & BD_ENET_RX_OV)
 530                                 fep->stats.rx_crc_errors++;
 531
 532                         skbn = fep->rx_skbuff[curidx];
 533                         BUG_ON(skbn == NULL);
 534
 535                 } else {
 536
 537                         /* napi, got packet but no quota */
 538                         if (fpi->use_napi && --rx_work_limit < 0)
 539                                 break;
 540
 541                         skb = fep->rx_skbuff[curidx];
 542                         BUG_ON(skb == NULL);
 543
 544                         /*
 545                          * Process the incoming frame.
 546                          */
 547                         fep->stats.rx_packets++;
 548                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 549                         fep->stats.rx_bytes += pkt_len + 4;
 550
 551                         if (pkt_len <= fpi->rx_copybreak) {
 552                                 /* +2 to make IP header L1 cache aligned */
 553                                 skbn = dev_alloc_skb(pkt_len + 2);
 554                                 if (skbn != NULL) {
 555                                         skb_reserve(skbn, 2);   /* align IP header */
 556                                         memcpy(skbn->data, skb->data, pkt_len);
 557                                         /* swap */
 558                                         skbt = skb;
 559                                         skb = skbn;
 560                                         skbn = skbt;
 561                                 }
 562                         } else
 563                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 564
 565                         if (skbn != NULL) {
 566                                 skb->dev = dev;
 567                                 skb_put(skb, pkt_len);  /* Make room */
 568                                 skb->protocol = eth_type_trans(skb, dev);
 569                                 received++;
 570                                 if (!fpi->use_napi)
 571                                         netif_rx(skb);
 572                                 else
 573                                         netif_receive_skb(skb);
 574                         } else {
 575                                 printk(KERN_WARNING DRV_MODULE_NAME
 576                                        ": %s Memory squeeze, dropping packet.\n",
 577                                        dev->name);
 578                                 fep->stats.rx_dropped++;
 579                                 skbn = skb;
 580                         }
 581                 }
 582
 583                 fep->rx_skbuff[curidx] = skbn;
 584                 CBDW_BUFADDR(bdp, dma_map_single(NULL, skbn->data,
 585                                                  L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 586                                                  DMA_FROM_DEVICE));
 587                 CBDW_DATLEN(bdp, 0);
 588                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 589
 590                 /*
 591                  * Update BD pointer to next entry.
 592                  */
 593                 if ((sc & BD_ENET_RX_WRAP) == 0)
 594                         bdp++;
 595                 else
 596                         bdp = fep->rx_bd_base;
 597
 598                 /*
 599                  * Doing this here will keep the FEC running while we process
 600                  * incoming frames.  On a heavily loaded network, we should be
 601                  * able to keep up at the expense of system resources.
 602                  */
 603                 FW(fecp, r_des_active, 0x01000000);
 604         }
 605
 606         fep->cur_rx = bdp;
 607
 608         if (fpi->use_napi) {
 609                 dev->quota -= received;
 610                 *budget -= received;
 611
 612                 if (rx_work_limit < 0)
 613                         return 1;       /* not done */
 614
 615                 /* done */
 616                 netif_rx_complete(dev);
 617
 618                 /* enable RX interrupt bits */
 619                 FS(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
 620         }
 621
 622         return 0;
 623 }
 624
 625 static void fec_enet_tx(struct net_device *dev)
 626 {
 627         struct fec_enet_private *fep = netdev_priv(dev);
 628         cbd_t *bdp;
 629         struct sk_buff *skb;
 630         int dirtyidx, do_wake;
 631         __u16 sc;
 632
 633         spin_lock(&fep->lock);
 634         bdp = fep->dirty_tx;
 635
 636         do_wake = 0;
 637         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
 638
 639                 dirtyidx = bdp - fep->tx_bd_base;
 640
 641                 if (fep->tx_free == fep->tx_ring)
 642                         break;
 643
 644                 skb = fep->tx_skbuff[dirtyidx];
 645
 646                 /*
 647                  * Check for errors.
 648                  */
 649                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 650                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 651                         fep->stats.tx_errors++;
 652                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 653                                 fep->stats.tx_heartbeat_errors++;
 654                         if (sc & BD_ENET_TX_LC) /* Late collision */
 655                                 fep->stats.tx_window_errors++;
 656                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 657                                 fep->stats.tx_aborted_errors++;
 658                         if (sc & BD_ENET_TX_UN) /* Underrun */
 659                                 fep->stats.tx_fifo_errors++;
 660                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 661                                 fep->stats.tx_carrier_errors++;
 662                 } else
 663                         fep->stats.tx_packets++;
 664
 665                 if (sc & BD_ENET_TX_READY)
 666                         printk(KERN_WARNING DRV_MODULE_NAME
 667                                ": %s HEY! Enet xmit interrupt and TX_READY.\n",
 668                                dev->name);
 669
 670                 /*
 671                  * Deferred means some collisions occurred during transmit,
 672                  * but we eventually sent the packet OK.
 673                  */
 674                 if (sc & BD_ENET_TX_DEF)
 675                         fep->stats.collisions++;
 676
 677                 /*
 678                  * Free the sk buffer associated with this last transmit.
 679                  */
 680                 dev_kfree_skb_irq(skb);
 681                 fep->tx_skbuff[dirtyidx] = NULL;
 682
 683                 /*
 684                  * Update pointer to next buffer descriptor to be transmitted.
 685                  */
 686                 if ((sc & BD_ENET_TX_WRAP) == 0)
 687                         bdp++;
 688                 else
 689                         bdp = fep->tx_bd_base;
 690
 691                 /*
 692                  * Since we have freed up a buffer, the ring is no longer
 693                  * full.
 694                  */
 695                 if (!fep->tx_free++)
 696                         do_wake = 1;
 697         }
 698
 699         fep->dirty_tx = bdp;
 700
 701         spin_unlock(&fep->lock);
 702
 703         if (do_wake && netif_queue_stopped(dev))
 704                 netif_wake_queue(dev);
 705 }
 706
 707 /*
 708  * The interrupt handler.
 709  * This is called from the MPC core interrupt.
 710  */
 711 static irqreturn_t
 712 fec_enet_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 713 {
 714         struct net_device *dev = dev_id;
 715         struct fec_enet_private *fep;
 716         const struct fec_platform_info *fpi;
 717         fec_t *fecp;
 718         __u32 int_events;
 719         __u32 int_events_napi;
 720
 721         if (unlikely(dev == NULL))
 722                 return IRQ_NONE;
 723
 724         fep = netdev_priv(dev);
 725         fecp = fep->fecp;
 726         fpi = fep->fpi;
 727
 728         /*
 729          * Get the interrupt events that caused us to be here.
 730          */
 731         while ((int_events = FR(fecp, ievent) & FR(fecp, imask)) != 0) {
 732
 733                 if (!fpi->use_napi)
 734                         FW(fecp, ievent, int_events);
 735                 else {
 736                         int_events_napi = int_events & ~(FEC_ENET_RXF | FEC_ENET_RXB);
 737                         FW(fecp, ievent, int_events_napi);
 738                 }
 739
 740                 if ((int_events & (FEC_ENET_HBERR | FEC_ENET_BABR |
 741                                    FEC_ENET_BABT | FEC_ENET_EBERR)) != 0)
 742                         printk(KERN_WARNING DRV_MODULE_NAME
 743                                ": %s FEC ERROR(s) 0x%x\n",
 744                                dev->name, int_events);
 745
 746                 if ((int_events & FEC_ENET_RXF) != 0) {
 747                         if (!fpi->use_napi)
 748                                 fec_enet_rx_common(dev, NULL);
 749                         else {
 750                                 if (netif_rx_schedule_prep(dev)) {
 751                                         /* disable rx interrupts */
 752                                         FC(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
 753                                         __netif_rx_schedule(dev);
 754                                 } else {
 755                                         printk(KERN_ERR DRV_MODULE_NAME
 756                                                ": %s driver bug! interrupt while in poll!\n",
 757                                                dev->name);
 758                                         FC(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
 759                                 }
 760                         }
 761                 }
 762
 763                 if ((int_events & FEC_ENET_TXF) != 0)
 764                         fec_enet_tx(dev);
 765         }
 766
 767         return IRQ_HANDLED;
 768 }
 769
 770 /* This interrupt occurs when the PHY detects a link change. */
 771 static irqreturn_t
 772 fec_mii_link_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 773 {
 774         struct net_device *dev = dev_id;
 775         struct fec_enet_private *fep;
 776         const struct fec_platform_info *fpi;
 777
 778         if (unlikely(dev == NULL))
 779                 return IRQ_NONE;
 780
 781         fep = netdev_priv(dev);
 782         fpi = fep->fpi;
 783
 784         if (!fpi->use_mdio)
 785                 return IRQ_NONE;
 786
 787         /*
 788          * Acknowledge the interrupt if possible. If we have not
 789          * found the PHY yet we can't process or acknowledge the
 790          * interrupt now. Instead we ignore this interrupt for now,
 791          * which we can do since it is edge triggered. It will be
 792          * acknowledged later by fec_enet_open().
 793          */
 794         if (!fep->phy)
 795                 return IRQ_NONE;
 796
 797         fec_mii_ack_int(dev);
 798         fec_mii_link_status_change_check(dev, 0);
 799
 800         return IRQ_HANDLED;
 801 }
 802
 803
 804 /**********************************************************************************/
 805
 806 static int fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 807 {
 808         struct fec_enet_private *fep = netdev_priv(dev);
 809         fec_t *fecp = fep->fecp;
 810         cbd_t *bdp;
 811         int curidx;
 812         unsigned long flags;
 813
 814         spin_lock_irqsave(&fep->tx_lock, flags);
 815
 816         /*
 817          * Fill in a Tx ring entry
 818          */
 819         bdp = fep->cur_tx;
 820
 821         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 822                 netif_stop_queue(dev);
 823                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 824
 825                 /*
 826                  * Ooops.  All transmit buffers are full.  Bail out.
 827                  * This should not happen, since the tx queue should be stopped.
 828                  */
 829                 printk(KERN_WARNING DRV_MODULE_NAME
 830                        ": %s tx queue full!.\n", dev->name);
 831                 return 1;
 832         }
 833
 834         curidx = bdp - fep->tx_bd_base;
 835         /*
 836          * Clear all of the status flags.
 837          */
 838         CBDC_SC(bdp, BD_ENET_TX_STATS);
 839
 840         /*
 841          * Save skb pointer.
 842          */
 843         fep->tx_skbuff[curidx] = skb;
 844
 845         fep->stats.tx_bytes += skb->len;
 846
 847         /*
 848          * Push the data cache so the CPM does not get stale memory data.
 849          */
 850         CBDW_BUFADDR(bdp, dma_map_single(NULL, skb->data,
 851                                          skb->len, DMA_TO_DEVICE));
 852         CBDW_DATLEN(bdp, skb->len);
 853
 854         dev->trans_start = jiffies;
 855
 856         /*
 857          * If this was the last BD in the ring, start at the beginning again.
 858          */
 859         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 860                 fep->cur_tx++;
 861         else
 862                 fep->cur_tx = fep->tx_bd_base;
 863
 864         if (!--fep->tx_free)
 865                 netif_stop_queue(dev);
 866
 867         /*
 868          * Trigger transmission start
 869          */
 870         CBDS_SC(bdp, BD_ENET_TX_READY | BD_ENET_TX_INTR |
 871                 BD_ENET_TX_LAST | BD_ENET_TX_TC);
 872         FW(fecp, x_des_active, 0x01000000);
 873
 874         spin_unlock_irqrestore(&fep->tx_lock, flags);
 875
 876         return 0;
 877 }
 878
 879 static void fec_timeout(struct net_device *dev)
 880 {
 881         struct fec_enet_private *fep = netdev_priv(dev);
 882
 883         fep->stats.tx_errors++;
 884
 885         if (fep->tx_free)
 886                 netif_wake_queue(dev);
 887
 888         /* check link status again */
 889         fec_mii_link_status_change_check(dev, 0);
 890 }
 891
 892 static int fec_enet_open(struct net_device *dev)
 893 {
 894         struct fec_enet_private *fep = netdev_priv(dev);
 895         const struct fec_platform_info *fpi = fep->fpi;
 896         unsigned long flags;
 897
 898         /* Install our interrupt handler. */
 899         if (request_irq(fpi->fec_irq, fec_enet_interrupt, 0, "fec", dev) != 0) {
 900                 printk(KERN_ERR DRV_MODULE_NAME
 901                        ": %s Could not allocate FEC IRQ!", dev->name);
 902                 return -EINVAL;
 903         }
 904
 905         /* Install our phy interrupt handler */
 906         if (fpi->phy_irq != -1 &&
 907                 request_irq(fpi->phy_irq, fec_mii_link_interrupt, 0, "fec-phy",
 908                                 dev) != 0) {
 909                 printk(KERN_ERR DRV_MODULE_NAME
 910                        ": %s Could not allocate PHY IRQ!", dev->name);
 911                 free_irq(fpi->fec_irq, dev);
 912                 return -EINVAL;
 913         }
 914
 915         if (fpi->use_mdio) {
 916                 fec_mii_startup(dev);
 917                 netif_carrier_off(dev);
 918                 fec_mii_link_status_change_check(dev, 1);
 919         } else {
 920                 spin_lock_irqsave(&fep->lock, flags);
 921                 fec_restart(dev, 1, 100);       /* XXX this sucks */
 922                 spin_unlock_irqrestore(&fep->lock, flags);
 923
 924                 netif_carrier_on(dev);
 925                 netif_start_queue(dev);
 926         }
 927         return 0;
 928 }
 929
 930 static int fec_enet_close(struct net_device *dev)
 931 {
 932         struct fec_enet_private *fep = netdev_priv(dev);
 933         const struct fec_platform_info *fpi = fep->fpi;
 934         unsigned long flags;
 935
 936         netif_stop_queue(dev);
 937         netif_carrier_off(dev);
 938
 939         if (fpi->use_mdio)
 940                 fec_mii_shutdown(dev);
 941
 942         spin_lock_irqsave(&fep->lock, flags);
 943         fec_stop(dev);
 944         spin_unlock_irqrestore(&fep->lock, flags);
 945
 946         /* release any irqs */
 947         if (fpi->phy_irq != -1)
 948                 free_irq(fpi->phy_irq, dev);
 949         free_irq(fpi->fec_irq, dev);
 950
 951         return 0;
 952 }
 953
 954 static struct net_device_stats *fec_enet_get_stats(struct net_device *dev)
 955 {
 956         struct fec_enet_private *fep = netdev_priv(dev);
 957         return &fep->stats;
 958 }
 959
 960 static int fec_enet_poll(struct net_device *dev, int *budget)
 961 {
 962         return fec_enet_rx_common(dev, budget);
 963 }
 964
 965 /*************************************************************************/
 966
 967 static void fec_get_drvinfo(struct net_device *dev,
 968                             struct ethtool_drvinfo *info)
 969 {
 970         strcpy(info->driver, DRV_MODULE_NAME);
 971         strcpy(info->version, DRV_MODULE_VERSION);
 972 }
 973
 974 static int fec_get_regs_len(struct net_device *dev)
 975 {
 976         return sizeof(fec_t);
 977 }
 978
 979 static void fec_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 980                          void *p)
 981 {
 982         struct fec_enet_private *fep = netdev_priv(dev);
 983         unsigned long flags;
 984
 985         if (regs->len < sizeof(fec_t))
 986                 return;
 987
 988         regs->version = 0;
 989         spin_lock_irqsave(&fep->lock, flags);
 990         memcpy_fromio(p, fep->fecp, sizeof(fec_t));
 991         spin_unlock_irqrestore(&fep->lock, flags);
 992 }
 993
 994 static int fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 995 {
 996         struct fec_enet_private *fep = netdev_priv(dev);
 997         unsigned long flags;
 998         int rc;
 999
1000         spin_lock_irqsave(&fep->lock, flags);
1001         rc = mii_ethtool_gset(&fep->mii_if, cmd);
1002         spin_unlock_irqrestore(&fep->lock, flags);
1003
1004         return rc;
1005 }
1006
1007 static int fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1008 {
1009         struct fec_enet_private *fep = netdev_priv(dev);
1010         unsigned long flags;
1011         int rc;
1012
1013         spin_lock_irqsave(&fep->lock, flags);
1014         rc = mii_ethtool_sset(&fep->mii_if, cmd);
1015         spin_unlock_irqrestore(&fep->lock, flags);
1016
1017         return rc;
1018 }
1019
1020 static int fec_nway_reset(struct net_device *dev)
1021 {
1022         struct fec_enet_private *fep = netdev_priv(dev);
1023         return mii_nway_restart(&fep->mii_if);
1024 }
1025
1026 static __u32 fec_get_msglevel(struct net_device *dev)
1027 {
1028         struct fec_enet_private *fep = netdev_priv(dev);
1029         return fep->msg_enable;
1030 }
1031
1032 static void fec_set_msglevel(struct net_device *dev, __u32 value)
1033 {
1034         struct fec_enet_private *fep = netdev_priv(dev);
1035         fep->msg_enable = value;
1036 }
1037
1038 static struct ethtool_ops fec_ethtool_ops = {
1039         .get_drvinfo = fec_get_drvinfo,
1040         .get_regs_len = fec_get_regs_len,
1041         .get_settings = fec_get_settings,
1042         .set_settings = fec_set_settings,
1043         .nway_reset = fec_nway_reset,
1044         .get_link = ethtool_op_get_link,
1045         .get_msglevel = fec_get_msglevel,
1046         .set_msglevel = fec_set_msglevel,
1047         .get_tx_csum = ethtool_op_get_tx_csum,
1048         .set_tx_csum = ethtool_op_set_tx_csum,  /* local! */
1049         .get_sg = ethtool_op_get_sg,
1050         .set_sg = ethtool_op_set_sg,
1051         .get_regs = fec_get_regs,
1052 };
1053
1054 static int fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1055 {
1056         struct fec_enet_private *fep = netdev_priv(dev);
1057         struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
1058         unsigned long flags;
1059         int rc;
1060
1061         if (!netif_running(dev))
1062                 return -EINVAL;
1063
1064         spin_lock_irqsave(&fep->lock, flags);
1065         rc = generic_mii_ioctl(&fep->mii_if, mii, cmd, NULL);
1066         spin_unlock_irqrestore(&fep->lock, flags);
1067         return rc;
1068 }
1069
1070 int fec_8xx_init_one(const struct fec_platform_info *fpi,
1071                      struct net_device **devp)
1072 {
1073         immap_t *immap = (immap_t *) IMAP_ADDR;
1074         static int fec_8xx_version_printed = 0;
1075         struct net_device *dev = NULL;
1076         struct fec_enet_private *fep = NULL;
1077         fec_t *fecp = NULL;
1078         int i;
1079         int err = 0;
1080         int registered = 0;
1081         __u32 siel;
1082
1083         *devp = NULL;
1084
1085         switch (fpi->fec_no) {
1086         case 0:
1087                 fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
1088                 break;
1089 #ifdef CONFIG_DUET
1090         case 1:
1091                 fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec2;
1092                 break;
1093 #endif
1094         default:
1095                 return -EINVAL;
1096         }
1097
1098         if (fec_8xx_version_printed++ == 0)
1099                 printk(KERN_INFO "%s", version);
1100
1101         i = sizeof(*fep) + (sizeof(struct sk_buff **) *
1102                             (fpi->rx_ring + fpi->tx_ring));
1103
1104         dev = alloc_etherdev(i);
1105         if (!dev) {
1106                 err = -ENOMEM;
1107                 goto err;
1108         }
1109         SET_MODULE_OWNER(dev);
1110
1111         fep = netdev_priv(dev);
1112
1113         /* partial reset of FEC */
1114         fec_whack_reset(fecp);
1115
1116         /* point rx_skbuff, tx_skbuff */
1117         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1118         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1119
1120         fep->fecp = fecp;
1121         fep->fpi = fpi;
1122
1123         /* init locks */
1124         spin_lock_init(&fep->lock);
1125         spin_lock_init(&fep->tx_lock);
1126
1127         /*
1128          * Set the Ethernet address.
1129          */
1130         for (i = 0; i < 6; i++)
1131                 dev->dev_addr[i] = fpi->macaddr[i];
1132
1133         fep->ring_base = dma_alloc_coherent(NULL,
1134                                             (fpi->tx_ring + fpi->rx_ring) *
1135                                             sizeof(cbd_t), &fep->ring_mem_addr,
1136                                             GFP_KERNEL);
1137         if (fep->ring_base == NULL) {
1138                 printk(KERN_ERR DRV_MODULE_NAME
1139                        ": %s dma alloc failed.\n", dev->name);
1140                 err = -ENOMEM;
1141                 goto err;
1142         }
1143
1144         /*
1145          * Set receive and transmit descriptor base.
1146          */
1147         fep->rx_bd_base = fep->ring_base;
1148         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1149
1150         /* initialize ring size variables */
1151         fep->tx_ring = fpi->tx_ring;
1152         fep->rx_ring = fpi->rx_ring;
1153
1154         /* SIU interrupt */
1155         if (fpi->phy_irq != -1 &&
1156                 (fpi->phy_irq >= SIU_IRQ0 && fpi->phy_irq < SIU_LEVEL7)) {
1157
1158                 siel = in_be32(&immap->im_siu_conf.sc_siel);
1159                 if ((fpi->phy_irq & 1) == 0)
1160                         siel |= (0x80000000 >> fpi->phy_irq);
1161                 else
1162                         siel &= ~(0x80000000 >> (fpi->phy_irq & ~1));
1163                 out_be32(&immap->im_siu_conf.sc_siel, siel);
1164         }
1165
1166         /*
1167          * The FEC Ethernet specific entries in the device structure.
1168          */
1169         dev->open = fec_enet_open;
1170         dev->hard_start_xmit = fec_enet_start_xmit;
1171         dev->tx_timeout = fec_timeout;
1172         dev->watchdog_timeo = TX_TIMEOUT;
1173         dev->stop = fec_enet_close;
1174         dev->get_stats = fec_enet_get_stats;
1175         dev->set_multicast_list = fec_set_multicast_list;
1176         dev->set_mac_address = fec_set_mac_address;
1177         if (fpi->use_napi) {
1178                 dev->poll = fec_enet_poll;
1179                 dev->weight = fpi->napi_weight;
1180         }
1181         dev->ethtool_ops = &fec_ethtool_ops;
1182         dev->do_ioctl = fec_ioctl;
1183
1184         fep->fec_phy_speed =
1185             ((((fpi->sys_clk + 4999999) / 2500000) / 2) & 0x3F) << 1;
1186
1187         init_timer(&fep->phy_timer_list);
1188
1189         /* partial reset of FEC so that only MII works */
1190         FW(fecp, mii_speed, fep->fec_phy_speed);
1191         FW(fecp, ievent, 0xffc0);
1192         FW(fecp, ivec, (fpi->fec_irq / 2) << 29);
1193         FW(fecp, imask, 0);
1194         FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
1195         FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
1196
1197         netif_carrier_off(dev);
1198
1199         err = register_netdev(dev);
1200         if (err != 0)
1201                 goto err;
1202         registered = 1;
1203
1204         if (fpi->use_mdio) {
1205                 fep->mii_if.dev = dev;
1206                 fep->mii_if.mdio_read = fec_mii_read;
1207                 fep->mii_if.mdio_write = fec_mii_write;
1208                 fep->mii_if.phy_id_mask = 0x1f;
1209                 fep->mii_if.reg_num_mask = 0x1f;
1210                 fep->mii_if.phy_id = fec_mii_phy_id_detect(dev);
1211         }
1212
1213         *devp = dev;
1214
1215         return 0;
1216
1217       err:
1218         if (dev != NULL) {
1219                 if (fecp != NULL)
1220                         fec_whack_reset(fecp);
1221
1222                 if (registered)
1223                         unregister_netdev(dev);
1224
1225                 if (fep != NULL) {
1226                         if (fep->ring_base)
1227                                 dma_free_coherent(NULL,
1228                                                   (fpi->tx_ring +
1229                                                    fpi->rx_ring) *
1230                                                   sizeof(cbd_t), fep->ring_base,
1231                                                   fep->ring_mem_addr);
1232                 }
1233                 free_netdev(dev);
1234         }
1235         return err;
1236 }
1237
1238 int fec_8xx_cleanup_one(struct net_device *dev)
1239 {
1240         struct fec_enet_private *fep = netdev_priv(dev);
1241         fec_t *fecp = fep->fecp;
1242         const struct fec_platform_info *fpi = fep->fpi;
1243
1244         fec_whack_reset(fecp);
1245
1246         unregister_netdev(dev);
1247
1248         dma_free_coherent(NULL, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
1249                           fep->ring_base, fep->ring_mem_addr);
1250
1251         free_netdev(dev);
1252
1253         return 0;
1254 }
1255
1256 /**************************************************************************************/
1257 /**************************************************************************************/
1258 /**************************************************************************************/
1259
1260 static int __init fec_8xx_init(void)
1261 {
1262         return fec_8xx_platform_init();
1263 }
1264
1265 static void __exit fec_8xx_cleanup(void)
1266 {
1267         fec_8xx_platform_cleanup();
1268 }
1269
1270 /**************************************************************************************/
1271 /**************************************************************************************/
1272 /**************************************************************************************/
1273
1274 module_init(fec_8xx_init);
1275 module_exit(fec_8xx_cleanup);