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/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <linux/string.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/errno.h>
  19 #include <linux/ioport.h>
  20 #include <linux/slab.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/init.h>
  23 #include <linux/delay.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/mii.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/bitops.h>
  31 #include <linux/dma-mapping.h>
  32
  33 #include <asm/8xx_immap.h>
  34 #include <asm/pgtable.h>
  35 #include <asm/mpc8xx.h>
  36 #include <asm/irq.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/cpm1.h>
  39
  40 #include "fec_8xx.h"
  41
  42 /*************************************************/
  43
  44 #define FEC_MAX_MULTICAST_ADDRS 64
  45
  46 /*************************************************/
  47
  48 static char version[] __devinitdata =
  49     DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";
  50
  51 MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
  52 MODULE_DESCRIPTION("Motorola 8xx FEC ethernet driver");
  53 MODULE_LICENSE("GPL");
  54
  55 int fec_8xx_debug = -1;         /* -1 == use FEC_8XX_DEF_MSG_ENABLE as value */
  56 module_param(fec_8xx_debug, int, 0);
  57 MODULE_PARM_DESC(fec_8xx_debug,
  58                  "FEC 8xx bitmapped debugging message enable value");
  59
  60
  61 /*************************************************/
  62
  63 /*
  64  * Delay to wait for FEC reset command to complete (in us)
  65  */
  66 #define FEC_RESET_DELAY         50
  67
  68 /*****************************************************************************************/
  69
  70 static void fec_whack_reset(fec_t * fecp)
  71 {
  72         int i;
  73
  74         /*
  75          * Whack a reset.  We should wait for this.
  76          */
  77         FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
  78         for (i = 0;
  79              (FR(fecp, ecntrl) & FEC_ECNTRL_RESET) != 0 && i < FEC_RESET_DELAY;
  80              i++)
  81                 udelay(1);
  82
  83         if (i == FEC_RESET_DELAY)
  84                 printk(KERN_WARNING "FEC Reset timeout!\n");
  85
  86 }
  87
  88 /****************************************************************************/
  89
  90 /*
  91  * Transmitter timeout.
  92  */
  93 #define TX_TIMEOUT (2*HZ)
  94
  95 /****************************************************************************/
  96
  97 /*
  98  * Returns the CRC needed when filling in the hash table for
  99  * multicast group filtering
 100  * pAddr must point to a MAC address (6 bytes)
 101  */
 102 static __u32 fec_mulicast_calc_crc(char *pAddr)
 103 {
 104         u8 byte;
 105         int byte_count;
 106         int bit_count;
 107         __u32 crc = 0xffffffff;
 108         u8 msb;
 109
 110         for (byte_count = 0; byte_count < 6; byte_count++) {
 111                 byte = pAddr[byte_count];
 112                 for (bit_count = 0; bit_count < 8; bit_count++) {
 113                         msb = crc >> 31;
 114                         crc <<= 1;
 115                         if (msb ^ (byte & 0x1)) {
 116                                 crc ^= FEC_CRC_POLY;
 117                         }
 118                         byte >>= 1;
 119                 }
 120         }
 121         return (crc);
 122 }
 123
 124 /*
 125  * Set or clear the multicast filter for this adaptor.
 126  * Skeleton taken from sunlance driver.
 127  * The CPM Ethernet implementation allows Multicast as well as individual
 128  * MAC address filtering.  Some of the drivers check to make sure it is
 129  * a group multicast address, and discard those that are not.  I guess I
 130  * will do the same for now, but just remove the test if you want
 131  * individual filtering as well (do the upper net layers want or support
 132  * this kind of feature?).
 133  */
 134 static void fec_set_multicast_list(struct net_device *dev)
 135 {
 136         struct fec_enet_private *fep = netdev_priv(dev);
 137         fec_t *fecp = fep->fecp;
 138         struct dev_mc_list *pmc;
 139         __u32 crc;
 140         int temp;
 141         __u32 csrVal;
 142         int hash_index;
 143         __u32 hthi, htlo;
 144         unsigned long flags;
 145
 146
 147         if ((dev->flags & IFF_PROMISC) != 0) {
 148
 149                 spin_lock_irqsave(&fep->lock, flags);
 150                 FS(fecp, r_cntrl, FEC_RCNTRL_PROM);
 151                 spin_unlock_irqrestore(&fep->lock, flags);
 152
 153                 /*
 154                  * Log any net taps.
 155                  */
 156                 printk(KERN_WARNING DRV_MODULE_NAME
 157                        ": %s: Promiscuous mode enabled.\n", dev->name);
 158                 return;
 159
 160         }
 161
 162         if ((dev->flags & IFF_ALLMULTI) != 0 ||
 163             dev->mc_count > FEC_MAX_MULTICAST_ADDRS) {
 164                 /*
 165                  * Catch all multicast addresses, set the filter to all 1's.
 166                  */
 167                 hthi = 0xffffffffU;
 168                 htlo = 0xffffffffU;
 169         } else {
 170                 hthi = 0;
 171                 htlo = 0;
 172
 173                 /*
 174                  * Now populate the hash table
 175                  */
 176                 for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next) {
 177                         crc = fec_mulicast_calc_crc(pmc->dmi_addr);
 178                         temp = (crc & 0x3f) >> 1;
 179                         hash_index = ((temp & 0x01) << 4) |
 180                                      ((temp & 0x02) << 2) |
 181                                      ((temp & 0x04)) |
 182                                      ((temp & 0x08) >> 2) |
 183                                      ((temp & 0x10) >> 4);
 184                         csrVal = (1 << hash_index);
 185                         if (crc & 1)
 186                                 hthi |= csrVal;
 187                         else
 188                                 htlo |= csrVal;
 189                 }
 190         }
 191
 192         spin_lock_irqsave(&fep->lock, flags);
 193         FC(fecp, r_cntrl, FEC_RCNTRL_PROM);
 194         FW(fecp, hash_table_high, hthi);
 195         FW(fecp, hash_table_low, htlo);
 196         spin_unlock_irqrestore(&fep->lock, flags);
 197 }
 198
 199 static int fec_set_mac_address(struct net_device *dev, void *addr)
 200 {
 201         struct sockaddr *mac = addr;
 202         struct fec_enet_private *fep = netdev_priv(dev);
 203         struct fec *fecp = fep->fecp;
 204         int i;
 205         __u32 addrhi, addrlo;
 206         unsigned long flags;
 207
 208         /* Get pointer to SCC area in parameter RAM. */
 209         for (i = 0; i < 6; i++)
 210                 dev->dev_addr[i] = mac->sa_data[i];
 211
 212         /*
 213          * Set station address.
 214          */
 215         addrhi = ((__u32) dev->dev_addr[0] << 24) |
 216                  ((__u32) dev->dev_addr[1] << 16) |
 217                  ((__u32) dev->dev_addr[2] <<  8) |
 218                   (__u32) dev->dev_addr[3];
 219         addrlo = ((__u32) dev->dev_addr[4] << 24) |
 220                  ((__u32) dev->dev_addr[5] << 16);
 221
 222         spin_lock_irqsave(&fep->lock, flags);
 223         FW(fecp, addr_low, addrhi);
 224         FW(fecp, addr_high, addrlo);
 225         spin_unlock_irqrestore(&fep->lock, flags);
 226
 227         return 0;
 228 }
 229
 230 /*
 231  * This function is called to start or restart the FEC during a link
 232  * change.  This only happens when switching between half and full
 233  * duplex.
 234  */
 235 void fec_restart(struct net_device *dev, int duplex, int speed)
 236 {
 237 #ifdef CONFIG_DUET
 238         immap_t *immap = (immap_t *) IMAP_ADDR;
 239         __u32 cptr;
 240 #endif
 241         struct fec_enet_private *fep = netdev_priv(dev);
 242         struct fec *fecp = fep->fecp;
 243         const struct fec_platform_info *fpi = fep->fpi;
 244         cbd_t *bdp;
 245         struct sk_buff *skb;
 246         int i;
 247         __u32 addrhi, addrlo;
 248
 249         fec_whack_reset(fep->fecp);
 250
 251         /*
 252          * Set station address.
 253          */
 254         addrhi = ((__u32) dev->dev_addr[0] << 24) |
 255                  ((__u32) dev->dev_addr[1] << 16) |
 256                  ((__u32) dev->dev_addr[2] <<  8) |
 257                  (__u32) dev->dev_addr[3];
 258         addrlo = ((__u32) dev->dev_addr[4] << 24) |
 259                  ((__u32) dev->dev_addr[5] << 16);
 260         FW(fecp, addr_low, addrhi);
 261         FW(fecp, addr_high, addrlo);
 262
 263         /*
 264          * Reset all multicast.
 265          */
 266         FW(fecp, hash_table_high, 0);
 267         FW(fecp, hash_table_low, 0);
 268
 269         /*
 270          * Set maximum receive buffer size.
 271          */
 272         FW(fecp, r_buff_size, PKT_MAXBLR_SIZE);
 273         FW(fecp, r_hash, PKT_MAXBUF_SIZE);
 274
 275         /*
 276          * Set receive and transmit descriptor base.
 277          */
 278         FW(fecp, r_des_start, iopa((__u32) (fep->rx_bd_base)));
 279         FW(fecp, x_des_start, iopa((__u32) (fep->tx_bd_base)));
 280
 281         fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
 282         fep->tx_free = fep->tx_ring;
 283         fep->cur_rx = fep->rx_bd_base;
 284
 285         /*
 286          * Reset SKB receive buffers
 287          */
 288         for (i = 0; i < fep->rx_ring; i++) {
 289                 if ((skb = fep->rx_skbuff[i]) == NULL)
 290                         continue;
 291                 fep->rx_skbuff[i] = NULL;
 292                 dev_kfree_skb(skb);
 293         }
 294
 295         /*
 296          * Initialize the receive buffer descriptors.
 297          */
 298         for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 299                 skb = dev_alloc_skb(ENET_RX_FRSIZE);
 300                 if (skb == NULL) {
 301                         printk(KERN_WARNING DRV_MODULE_NAME
 302                                ": %s Memory squeeze, unable to allocate skb\n",
 303                                dev->name);
 304                         fep->stats.rx_dropped++;
 305                         break;
 306                 }
 307                 fep->rx_skbuff[i] = skb;
 308                 skb->dev = dev;
 309                 CBDW_BUFADDR(bdp, dma_map_single(NULL, skb->data,
 310                                          L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 311                                          DMA_FROM_DEVICE));
 312                 CBDW_DATLEN(bdp, 0);    /* zero */
 313                 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
 314                         ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
 315         }
 316         /*
 317          * if we failed, fillup remainder
 318          */
 319         for (; i < fep->rx_ring; i++, bdp++) {
 320                 fep->rx_skbuff[i] = NULL;
 321                 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
 322         }
 323
 324         /*
 325          * Reset SKB transmit buffers.
 326          */
 327         for (i = 0; i < fep->tx_ring; i++) {
 328                 if ((skb = fep->tx_skbuff[i]) == NULL)
 329                         continue;
 330                 fep->tx_skbuff[i] = NULL;
 331                 dev_kfree_skb(skb);
 332         }
 333
 334         /*
 335          * ...and the same for transmit.
 336          */
 337         for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
 338                 fep->tx_skbuff[i] = NULL;
 339                 CBDW_BUFADDR(bdp, virt_to_bus(NULL));
 340                 CBDW_DATLEN(bdp, 0);
 341                 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
 342         }
 343
 344         /*
 345          * Enable big endian and don't care about SDMA FC.
 346          */
 347         FW(fecp, fun_code, 0x78000000);
 348
 349         /*
 350          * Set MII speed.
 351          */
 352         FW(fecp, mii_speed, fep->fec_phy_speed);
 353
 354         /*
 355          * Clear any outstanding interrupt.
 356          */
 357         FW(fecp, ievent, 0xffc0);
 358         FW(fecp, ivec, (fpi->fec_irq / 2) << 29);
 359
 360         /*
 361          * adjust to speed (only for DUET & RMII)
 362          */
 363 #ifdef CONFIG_DUET
 364         cptr = in_be32(&immap->im_cpm.cp_cptr);
 365         switch (fpi->fec_no) {
 366         case 0:
 367                 /*
 368                  * check if in RMII mode
 369                  */
 370                 if ((cptr & 0x100) == 0)
 371                         break;
 372
 373                 if (speed == 10)
 374                         cptr |= 0x0000010;
 375                 else if (speed == 100)
 376                         cptr &= ~0x0000010;
 377                 break;
 378         case 1:
 379                 /*
 380                  * check if in RMII mode
 381                  */
 382                 if ((cptr & 0x80) == 0)
 383                         break;
 384
 385                 if (speed == 10)
 386                         cptr |= 0x0000008;
 387                 else if (speed == 100)
 388                         cptr &= ~0x0000008;
 389                 break;
 390         default:
 391                 break;
 392         }
 393         out_be32(&immap->im_cpm.cp_cptr, cptr);
 394 #endif
 395
 396         FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
 397         /*
 398          * adjust to duplex mode
 399          */
 400         if (duplex) {
 401                 FC(fecp, r_cntrl, FEC_RCNTRL_DRT);
 402                 FS(fecp, x_cntrl, FEC_TCNTRL_FDEN);     /* FD enable */
 403         } else {
 404                 FS(fecp, r_cntrl, FEC_RCNTRL_DRT);
 405                 FC(fecp, x_cntrl, FEC_TCNTRL_FDEN);     /* FD disable */
 406         }
 407
 408         /*
 409          * Enable interrupts we wish to service.
 410          */
 411         FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB |
 412            FEC_ENET_RXF | FEC_ENET_RXB);
 413
 414         /*
 415          * And last, enable the transmit and receive processing.
 416          */
 417         FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 418         FW(fecp, r_des_active, 0x01000000);
 419 }
 420
 421 void fec_stop(struct net_device *dev)
 422 {
 423         struct fec_enet_private *fep = netdev_priv(dev);
 424         fec_t *fecp = fep->fecp;
 425         struct sk_buff *skb;
 426         int i;
 427
 428         if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0)
 429                 return;         /* already down */
 430
 431         FW(fecp, x_cntrl, 0x01);        /* Graceful transmit stop */
 432         for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) &&
 433              i < FEC_RESET_DELAY; i++)
 434                 udelay(1);
 435
 436         if (i == FEC_RESET_DELAY)
 437                 printk(KERN_WARNING DRV_MODULE_NAME
 438                        ": %s FEC timeout on graceful transmit stop\n",
 439                        dev->name);
 440         /*
 441          * Disable FEC. Let only MII interrupts.
 442          */
 443         FW(fecp, imask, 0);
 444         FW(fecp, ecntrl, ~FEC_ECNTRL_ETHER_EN);
 445
 446         /*
 447          * Reset SKB transmit buffers.
 448          */
 449         for (i = 0; i < fep->tx_ring; i++) {
 450                 if ((skb = fep->tx_skbuff[i]) == NULL)
 451                         continue;
 452                 fep->tx_skbuff[i] = NULL;
 453                 dev_kfree_skb(skb);
 454         }
 455
 456         /*
 457          * Reset SKB receive buffers
 458          */
 459         for (i = 0; i < fep->rx_ring; i++) {
 460                 if ((skb = fep->rx_skbuff[i]) == NULL)
 461                         continue;
 462                 fep->rx_skbuff[i] = NULL;
 463                 dev_kfree_skb(skb);
 464         }
 465 }
 466
 467 /* common receive function */
 468 static int fec_enet_rx_common(struct fec_enet_private *ep,
 469                               struct net_device *dev, int budget)
 470 {
 471         fec_t *fecp = fep->fecp;
 472         const struct fec_platform_info *fpi = fep->fpi;
 473         cbd_t *bdp;
 474         struct sk_buff *skb, *skbn, *skbt;
 475         int received = 0;
 476         __u16 pkt_len, sc;
 477         int curidx;
 478
 479         /*
 480          * First, grab all of the stats for the incoming packet.
 481          * These get messed up if we get called due to a busy condition.
 482          */
 483         bdp = fep->cur_rx;
 484
 485         /* clear RX status bits for napi*/
 486         if (fpi->use_napi)
 487                 FW(fecp, ievent, FEC_ENET_RXF | FEC_ENET_RXB);
 488
 489         while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
 490
 491                 curidx = bdp - fep->rx_bd_base;
 492
 493                 /*
 494                  * Since we have allocated space to hold a complete frame,
 495                  * the last indicator should be set.
 496                  */
 497                 if ((sc & BD_ENET_RX_LAST) == 0)
 498                         printk(KERN_WARNING DRV_MODULE_NAME
 499                                ": %s rcv is not +last\n",
 500                                dev->name);
 501
 502                 /*
 503                  * Check for errors.
 504                  */
 505                 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
 506                           BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
 507                         fep->stats.rx_errors++;
 508                         /* Frame too long or too short. */
 509                         if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
 510                                 fep->stats.rx_length_errors++;
 511                         /* Frame alignment */
 512                         if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
 513                                 fep->stats.rx_frame_errors++;
 514                         /* CRC Error */
 515                         if (sc & BD_ENET_RX_CR)
 516                                 fep->stats.rx_crc_errors++;
 517                         /* FIFO overrun */
 518                         if (sc & BD_ENET_RX_OV)
 519                                 fep->stats.rx_crc_errors++;
 520
 521                         skbn = fep->rx_skbuff[curidx];
 522                         BUG_ON(skbn == NULL);
 523
 524                 } else {
 525                         skb = fep->rx_skbuff[curidx];
 526                         BUG_ON(skb == NULL);
 527
 528                         /*
 529                          * Process the incoming frame.
 530                          */
 531                         fep->stats.rx_packets++;
 532                         pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
 533                         fep->stats.rx_bytes += pkt_len + 4;
 534
 535                         if (pkt_len <= fpi->rx_copybreak) {
 536                                 /* +2 to make IP header L1 cache aligned */
 537                                 skbn = dev_alloc_skb(pkt_len + 2);
 538                                 if (skbn != NULL) {
 539                                         skb_reserve(skbn, 2);   /* align IP header */
 540                                         skb_copy_from_linear_data(skb,
 541                                                                   skbn->data,
 542                                                                   pkt_len);
 543                                         /* swap */
 544                                         skbt = skb;
 545                                         skb = skbn;
 546                                         skbn = skbt;
 547                                 }
 548                         } else
 549                                 skbn = dev_alloc_skb(ENET_RX_FRSIZE);
 550
 551                         if (skbn != NULL) {
 552                                 skb_put(skb, pkt_len);  /* Make room */
 553                                 skb->protocol = eth_type_trans(skb, dev);
 554                                 received++;
 555                                 if (!fpi->use_napi)
 556                                         netif_rx(skb);
 557                                 else
 558                                         netif_receive_skb(skb);
 559                         } else {
 560                                 printk(KERN_WARNING DRV_MODULE_NAME
 561                                        ": %s Memory squeeze, dropping packet.\n",
 562                                        dev->name);
 563                                 fep->stats.rx_dropped++;
 564                                 skbn = skb;
 565                         }
 566                 }
 567
 568                 fep->rx_skbuff[curidx] = skbn;
 569                 CBDW_BUFADDR(bdp, dma_map_single(NULL, skbn->data,
 570                                                  L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
 571                                                  DMA_FROM_DEVICE));
 572                 CBDW_DATLEN(bdp, 0);
 573                 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 574
 575                 /*
 576                  * Update BD pointer to next entry.
 577                  */
 578                 if ((sc & BD_ENET_RX_WRAP) == 0)
 579                         bdp++;
 580                 else
 581                         bdp = fep->rx_bd_base;
 582
 583                 /*
 584                  * Doing this here will keep the FEC running while we process
 585                  * incoming frames.  On a heavily loaded network, we should be
 586                  * able to keep up at the expense of system resources.
 587                  */
 588                 FW(fecp, r_des_active, 0x01000000);
 589
 590                 if (received >= budget)
 591                         break;
 592
 593         }
 594
 595         fep->cur_rx = bdp;
 596
 597         if (fpi->use_napi) {
 598                 if (received < budget) {
 599                         netif_rx_complete(dev, &fep->napi);
 600
 601                         /* enable RX interrupt bits */
 602                         FS(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
 603                 }
 604         }
 605
 606         return received;
 607 }
 608
 609 static void fec_enet_tx(struct net_device *dev)
 610 {
 611         struct fec_enet_private *fep = netdev_priv(dev);
 612         cbd_t *bdp;
 613         struct sk_buff *skb;
 614         int dirtyidx, do_wake;
 615         __u16 sc;
 616
 617         spin_lock(&fep->lock);
 618         bdp = fep->dirty_tx;
 619
 620         do_wake = 0;
 621         while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
 622
 623                 dirtyidx = bdp - fep->tx_bd_base;
 624
 625                 if (fep->tx_free == fep->tx_ring)
 626                         break;
 627
 628                 skb = fep->tx_skbuff[dirtyidx];
 629
 630                 /*
 631                  * Check for errors.
 632                  */
 633                 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
 634                           BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 635                         fep->stats.tx_errors++;
 636                         if (sc & BD_ENET_TX_HB) /* No heartbeat */
 637                                 fep->stats.tx_heartbeat_errors++;
 638                         if (sc & BD_ENET_TX_LC) /* Late collision */
 639                                 fep->stats.tx_window_errors++;
 640                         if (sc & BD_ENET_TX_RL) /* Retrans limit */
 641                                 fep->stats.tx_aborted_errors++;
 642                         if (sc & BD_ENET_TX_UN) /* Underrun */
 643                                 fep->stats.tx_fifo_errors++;
 644                         if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
 645                                 fep->stats.tx_carrier_errors++;
 646                 } else
 647                         fep->stats.tx_packets++;
 648
 649                 if (sc & BD_ENET_TX_READY)
 650                         printk(KERN_WARNING DRV_MODULE_NAME
 651                                ": %s HEY! Enet xmit interrupt and TX_READY.\n",
 652                                dev->name);
 653
 654                 /*
 655                  * Deferred means some collisions occurred during transmit,
 656                  * but we eventually sent the packet OK.
 657                  */
 658                 if (sc & BD_ENET_TX_DEF)
 659                         fep->stats.collisions++;
 660
 661                 /*
 662                  * Free the sk buffer associated with this last transmit.
 663                  */
 664                 dev_kfree_skb_irq(skb);
 665                 fep->tx_skbuff[dirtyidx] = NULL;
 666
 667                 /*
 668                  * Update pointer to next buffer descriptor to be transmitted.
 669                  */
 670                 if ((sc & BD_ENET_TX_WRAP) == 0)
 671                         bdp++;
 672                 else
 673                         bdp = fep->tx_bd_base;
 674
 675                 /*
 676                  * Since we have freed up a buffer, the ring is no longer
 677                  * full.
 678                  */
 679                 if (!fep->tx_free++)
 680                         do_wake = 1;
 681         }
 682
 683         fep->dirty_tx = bdp;
 684
 685         spin_unlock(&fep->lock);
 686
 687         if (do_wake && netif_queue_stopped(dev))
 688                 netif_wake_queue(dev);
 689 }
 690
 691 /*
 692  * The interrupt handler.
 693  * This is called from the MPC core interrupt.
 694  */
 695 static irqreturn_t
 696 fec_enet_interrupt(int irq, void *dev_id)
 697 {
 698         struct net_device *dev = dev_id;
 699         struct fec_enet_private *fep;
 700         const struct fec_platform_info *fpi;
 701         fec_t *fecp;
 702         __u32 int_events;
 703         __u32 int_events_napi;
 704
 705         if (unlikely(dev == NULL))
 706                 return IRQ_NONE;
 707
 708         fep = netdev_priv(dev);
 709         fecp = fep->fecp;
 710         fpi = fep->fpi;
 711
 712         /*
 713          * Get the interrupt events that caused us to be here.
 714          */
 715         while ((int_events = FR(fecp, ievent) & FR(fecp, imask)) != 0) {
 716
 717                 if (!fpi->use_napi)
 718                         FW(fecp, ievent, int_events);
 719                 else {
 720                         int_events_napi = int_events & ~(FEC_ENET_RXF | FEC_ENET_RXB);
 721                         FW(fecp, ievent, int_events_napi);
 722                 }
 723
 724                 if ((int_events & (FEC_ENET_HBERR | FEC_ENET_BABR |
 725                                    FEC_ENET_BABT | FEC_ENET_EBERR)) != 0)
 726                         printk(KERN_WARNING DRV_MODULE_NAME
 727                                ": %s FEC ERROR(s) 0x%x\n",
 728                                dev->name, int_events);
 729
 730                 if ((int_events & FEC_ENET_RXF) != 0) {
 731                         if (!fpi->use_napi)
 732                                 fec_enet_rx_common(fep, dev, ~0);
 733                         else {
 734                                 if (netif_rx_schedule_prep(dev, &fep->napi)) {
 735                                         /* disable rx interrupts */
 736                                         FC(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
 737                                         __netif_rx_schedule(dev, &fep->napi);
 738                                 } else {
 739                                         printk(KERN_ERR DRV_MODULE_NAME
 740                                                ": %s driver bug! interrupt while in poll!\n",
 741                                                dev->name);
 742                                         FC(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
 743                                 }
 744                         }
 745                 }
 746
 747                 if ((int_events & FEC_ENET_TXF) != 0)
 748                         fec_enet_tx(dev);
 749         }
 750
 751         return IRQ_HANDLED;
 752 }
 753
 754 /* This interrupt occurs when the PHY detects a link change. */
 755 static irqreturn_t
 756 fec_mii_link_interrupt(int irq, void *dev_id)
 757 {
 758         struct net_device *dev = dev_id;
 759         struct fec_enet_private *fep;
 760         const struct fec_platform_info *fpi;
 761
 762         if (unlikely(dev == NULL))
 763                 return IRQ_NONE;
 764
 765         fep = netdev_priv(dev);
 766         fpi = fep->fpi;
 767
 768         if (!fpi->use_mdio)
 769                 return IRQ_NONE;
 770
 771         /*
 772          * Acknowledge the interrupt if possible. If we have not
 773          * found the PHY yet we can't process or acknowledge the
 774          * interrupt now. Instead we ignore this interrupt for now,
 775          * which we can do since it is edge triggered. It will be
 776          * acknowledged later by fec_enet_open().
 777          */
 778         if (!fep->phy)
 779                 return IRQ_NONE;
 780
 781         fec_mii_ack_int(dev);
 782         fec_mii_link_status_change_check(dev, 0);
 783
 784         return IRQ_HANDLED;
 785 }
 786
 787
 788 /**********************************************************************************/
 789
 790 static int fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 791 {
 792         struct fec_enet_private *fep = netdev_priv(dev);
 793         fec_t *fecp = fep->fecp;
 794         cbd_t *bdp;
 795         int curidx;
 796         unsigned long flags;
 797
 798         spin_lock_irqsave(&fep->tx_lock, flags);
 799
 800         /*
 801          * Fill in a Tx ring entry
 802          */
 803         bdp = fep->cur_tx;
 804
 805         if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
 806                 netif_stop_queue(dev);
 807                 spin_unlock_irqrestore(&fep->tx_lock, flags);
 808
 809                 /*
 810                  * Ooops.  All transmit buffers are full.  Bail out.
 811                  * This should not happen, since the tx queue should be stopped.
 812                  */
 813                 printk(KERN_WARNING DRV_MODULE_NAME
 814                        ": %s tx queue full!.\n", dev->name);
 815                 return 1;
 816         }
 817
 818         curidx = bdp - fep->tx_bd_base;
 819         /*
 820          * Clear all of the status flags.
 821          */
 822         CBDC_SC(bdp, BD_ENET_TX_STATS);
 823
 824         /*
 825          * Save skb pointer.
 826          */
 827         fep->tx_skbuff[curidx] = skb;
 828
 829         fep->stats.tx_bytes += skb->len;
 830
 831         /*
 832          * Push the data cache so the CPM does not get stale memory data.
 833          */
 834         CBDW_BUFADDR(bdp, dma_map_single(NULL, skb->data,
 835                                          skb->len, DMA_TO_DEVICE));
 836         CBDW_DATLEN(bdp, skb->len);
 837
 838         dev->trans_start = jiffies;
 839
 840         /*
 841          * If this was the last BD in the ring, start at the beginning again.
 842          */
 843         if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
 844                 fep->cur_tx++;
 845         else
 846                 fep->cur_tx = fep->tx_bd_base;
 847
 848         if (!--fep->tx_free)
 849                 netif_stop_queue(dev);
 850
 851         /*
 852          * Trigger transmission start
 853          */
 854         CBDS_SC(bdp, BD_ENET_TX_READY | BD_ENET_TX_INTR |
 855                 BD_ENET_TX_LAST | BD_ENET_TX_TC);
 856         FW(fecp, x_des_active, 0x01000000);
 857
 858         spin_unlock_irqrestore(&fep->tx_lock, flags);
 859
 860         return 0;
 861 }
 862
 863 static void fec_timeout(struct net_device *dev)
 864 {
 865         struct fec_enet_private *fep = netdev_priv(dev);
 866
 867         fep->stats.tx_errors++;
 868
 869         if (fep->tx_free)
 870                 netif_wake_queue(dev);
 871
 872         /* check link status again */
 873         fec_mii_link_status_change_check(dev, 0);
 874 }
 875
 876 static int fec_enet_open(struct net_device *dev)
 877 {
 878         struct fec_enet_private *fep = netdev_priv(dev);
 879         const struct fec_platform_info *fpi = fep->fpi;
 880         unsigned long flags;
 881
 882         napi_enable(&fep->napi);
 883
 884         /* Install our interrupt handler. */
 885         if (request_irq(fpi->fec_irq, fec_enet_interrupt, 0, "fec", dev) != 0) {
 886                 printk(KERN_ERR DRV_MODULE_NAME
 887                        ": %s Could not allocate FEC IRQ!", dev->name);
 888                 napi_disable(&fep->napi);
 889                 return -EINVAL;
 890         }
 891
 892         /* Install our phy interrupt handler */
 893         if (fpi->phy_irq != -1 &&
 894                 request_irq(fpi->phy_irq, fec_mii_link_interrupt, 0, "fec-phy",
 895                                 dev) != 0) {
 896                 printk(KERN_ERR DRV_MODULE_NAME
 897                        ": %s Could not allocate PHY IRQ!", dev->name);
 898                 free_irq(fpi->fec_irq, dev);
 899                 napi_disable(&fep->napi);
 900                 return -EINVAL;
 901         }
 902
 903         if (fpi->use_mdio) {
 904                 fec_mii_startup(dev);
 905                 netif_carrier_off(dev);
 906                 fec_mii_link_status_change_check(dev, 1);
 907         } else {
 908                 spin_lock_irqsave(&fep->lock, flags);
 909                 fec_restart(dev, 1, 100);       /* XXX this sucks */
 910                 spin_unlock_irqrestore(&fep->lock, flags);
 911
 912                 netif_carrier_on(dev);
 913                 netif_start_queue(dev);
 914         }
 915         return 0;
 916 }
 917
 918 static int fec_enet_close(struct net_device *dev)
 919 {
 920         struct fec_enet_private *fep = netdev_priv(dev);
 921         const struct fec_platform_info *fpi = fep->fpi;
 922         unsigned long flags;
 923
 924         netif_stop_queue(dev);
 925         napi_disable(&fep->napi);
 926         netif_carrier_off(dev);
 927
 928         if (fpi->use_mdio)
 929                 fec_mii_shutdown(dev);
 930
 931         spin_lock_irqsave(&fep->lock, flags);
 932         fec_stop(dev);
 933         spin_unlock_irqrestore(&fep->lock, flags);
 934
 935         /* release any irqs */
 936         if (fpi->phy_irq != -1)
 937                 free_irq(fpi->phy_irq, dev);
 938         free_irq(fpi->fec_irq, dev);
 939
 940         return 0;
 941 }
 942
 943 static struct net_device_stats *fec_enet_get_stats(struct net_device *dev)
 944 {
 945         struct fec_enet_private *fep = netdev_priv(dev);
 946         return &fep->stats;
 947 }
 948
 949 static int fec_enet_poll(struct napi_struct *napi, int budget)
 950 {
 951         struct fec_enet_private *fep = container_of(napi, struct fec_enet_private, napi);
 952         struct net_device *dev = fep->dev;
 953
 954         return fec_enet_rx_common(fep, dev, budget);
 955 }
 956
 957 /*************************************************************************/
 958
 959 static void fec_get_drvinfo(struct net_device *dev,
 960                             struct ethtool_drvinfo *info)
 961 {
 962         strcpy(info->driver, DRV_MODULE_NAME);
 963         strcpy(info->version, DRV_MODULE_VERSION);
 964 }
 965
 966 static int fec_get_regs_len(struct net_device *dev)
 967 {
 968         return sizeof(fec_t);
 969 }
 970
 971 static void fec_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 972                          void *p)
 973 {
 974         struct fec_enet_private *fep = netdev_priv(dev);
 975         unsigned long flags;
 976
 977         if (regs->len < sizeof(fec_t))
 978                 return;
 979
 980         regs->version = 0;
 981         spin_lock_irqsave(&fep->lock, flags);
 982         memcpy_fromio(p, fep->fecp, sizeof(fec_t));
 983         spin_unlock_irqrestore(&fep->lock, flags);
 984 }
 985
 986 static int fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 987 {
 988         struct fec_enet_private *fep = netdev_priv(dev);
 989         unsigned long flags;
 990         int rc;
 991
 992         spin_lock_irqsave(&fep->lock, flags);
 993         rc = mii_ethtool_gset(&fep->mii_if, cmd);
 994         spin_unlock_irqrestore(&fep->lock, flags);
 995
 996         return rc;
 997 }
 998
 999 static int fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1000 {
1001         struct fec_enet_private *fep = netdev_priv(dev);
1002         unsigned long flags;
1003         int rc;
1004
1005         spin_lock_irqsave(&fep->lock, flags);
1006         rc = mii_ethtool_sset(&fep->mii_if, cmd);
1007         spin_unlock_irqrestore(&fep->lock, flags);
1008
1009         return rc;
1010 }
1011
1012 static int fec_nway_reset(struct net_device *dev)
1013 {
1014         struct fec_enet_private *fep = netdev_priv(dev);
1015         return mii_nway_restart(&fep->mii_if);
1016 }
1017
1018 static __u32 fec_get_msglevel(struct net_device *dev)
1019 {
1020         struct fec_enet_private *fep = netdev_priv(dev);
1021         return fep->msg_enable;
1022 }
1023
1024 static void fec_set_msglevel(struct net_device *dev, __u32 value)
1025 {
1026         struct fec_enet_private *fep = netdev_priv(dev);
1027         fep->msg_enable = value;
1028 }
1029
1030 static const struct ethtool_ops fec_ethtool_ops = {
1031         .get_drvinfo    = fec_get_drvinfo,
1032         .get_regs_len   = fec_get_regs_len,
1033         .get_settings   = fec_get_settings,
1034         .set_settings   = fec_set_settings,
1035         .nway_reset     = fec_nway_reset,
1036         .get_link       = ethtool_op_get_link,
1037         .get_msglevel   = fec_get_msglevel,
1038         .set_msglevel   = fec_set_msglevel,
1039         .set_tx_csum    = ethtool_op_set_tx_csum,       /* local! */
1040         .set_sg         = ethtool_op_set_sg,
1041         .get_regs       = fec_get_regs,
1042 };
1043
1044 static int fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1045 {
1046         struct fec_enet_private *fep = netdev_priv(dev);
1047         struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;
1048         unsigned long flags;
1049         int rc;
1050
1051         if (!netif_running(dev))
1052                 return -EINVAL;
1053
1054         spin_lock_irqsave(&fep->lock, flags);
1055         rc = generic_mii_ioctl(&fep->mii_if, mii, cmd, NULL);
1056         spin_unlock_irqrestore(&fep->lock, flags);
1057         return rc;
1058 }
1059
1060 int fec_8xx_init_one(const struct fec_platform_info *fpi,
1061                      struct net_device **devp)
1062 {
1063         immap_t *immap = (immap_t *) IMAP_ADDR;
1064         static int fec_8xx_version_printed = 0;
1065         struct net_device *dev = NULL;
1066         struct fec_enet_private *fep = NULL;
1067         fec_t *fecp = NULL;
1068         int i;
1069         int err = 0;
1070         int registered = 0;
1071         __u32 siel;
1072
1073         *devp = NULL;
1074
1075         switch (fpi->fec_no) {
1076         case 0:
1077                 fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
1078                 break;
1079 #ifdef CONFIG_DUET
1080         case 1:
1081                 fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec2;
1082                 break;
1083 #endif
1084         default:
1085                 return -EINVAL;
1086         }
1087
1088         if (fec_8xx_version_printed++ == 0)
1089                 printk(KERN_INFO "%s", version);
1090
1091         i = sizeof(*fep) + (sizeof(struct sk_buff **) *
1092                             (fpi->rx_ring + fpi->tx_ring));
1093
1094         dev = alloc_etherdev(i);
1095         if (!dev) {
1096                 err = -ENOMEM;
1097                 goto err;
1098         }
1099
1100         fep = netdev_priv(dev);
1101         fep->dev = dev;
1102
1103         /* partial reset of FEC */
1104         fec_whack_reset(fecp);
1105
1106         /* point rx_skbuff, tx_skbuff */
1107         fep->rx_skbuff = (struct sk_buff **)&fep[1];
1108         fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1109
1110         fep->fecp = fecp;
1111         fep->fpi = fpi;
1112
1113         /* init locks */
1114         spin_lock_init(&fep->lock);
1115         spin_lock_init(&fep->tx_lock);
1116
1117         /*
1118          * Set the Ethernet address.
1119          */
1120         for (i = 0; i < 6; i++)
1121                 dev->dev_addr[i] = fpi->macaddr[i];
1122
1123         fep->ring_base = dma_alloc_coherent(NULL,
1124                                             (fpi->tx_ring + fpi->rx_ring) *
1125                                             sizeof(cbd_t), &fep->ring_mem_addr,
1126                                             GFP_KERNEL);
1127         if (fep->ring_base == NULL) {
1128                 printk(KERN_ERR DRV_MODULE_NAME
1129                        ": %s dma alloc failed.\n", dev->name);
1130                 err = -ENOMEM;
1131                 goto err;
1132         }
1133
1134         /*
1135          * Set receive and transmit descriptor base.
1136          */
1137         fep->rx_bd_base = fep->ring_base;
1138         fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1139
1140         /* initialize ring size variables */
1141         fep->tx_ring = fpi->tx_ring;
1142         fep->rx_ring = fpi->rx_ring;
1143
1144         /* SIU interrupt */
1145         if (fpi->phy_irq != -1 &&
1146                 (fpi->phy_irq >= SIU_IRQ0 && fpi->phy_irq < SIU_LEVEL7)) {
1147
1148                 siel = in_be32(&immap->im_siu_conf.sc_siel);
1149                 if ((fpi->phy_irq & 1) == 0)
1150                         siel |= (0x80000000 >> fpi->phy_irq);
1151                 else
1152                         siel &= ~(0x80000000 >> (fpi->phy_irq & ~1));
1153                 out_be32(&immap->im_siu_conf.sc_siel, siel);
1154         }
1155
1156         /*
1157          * The FEC Ethernet specific entries in the device structure.
1158          */
1159         dev->open = fec_enet_open;
1160         dev->hard_start_xmit = fec_enet_start_xmit;
1161         dev->tx_timeout = fec_timeout;
1162         dev->watchdog_timeo = TX_TIMEOUT;
1163         dev->stop = fec_enet_close;
1164         dev->get_stats = fec_enet_get_stats;
1165         dev->set_multicast_list = fec_set_multicast_list;
1166         dev->set_mac_address = fec_set_mac_address;
1167         netif_napi_add(dev, &fec->napi,
1168                        fec_enet_poll, fpi->napi_weight);
1169
1170         dev->ethtool_ops = &fec_ethtool_ops;
1171         dev->do_ioctl = fec_ioctl;
1172
1173         fep->fec_phy_speed =
1174             ((((fpi->sys_clk + 4999999) / 2500000) / 2) & 0x3F) << 1;
1175
1176         init_timer(&fep->phy_timer_list);
1177
1178         /* partial reset of FEC so that only MII works */
1179         FW(fecp, mii_speed, fep->fec_phy_speed);
1180         FW(fecp, ievent, 0xffc0);
1181         FW(fecp, ivec, (fpi->fec_irq / 2) << 29);
1182         FW(fecp, imask, 0);
1183         FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
1184         FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
1185
1186         netif_carrier_off(dev);
1187
1188         err = register_netdev(dev);
1189         if (err != 0)
1190                 goto err;
1191         registered = 1;
1192
1193         if (fpi->use_mdio) {
1194                 fep->mii_if.dev = dev;
1195                 fep->mii_if.mdio_read = fec_mii_read;
1196                 fep->mii_if.mdio_write = fec_mii_write;
1197                 fep->mii_if.phy_id_mask = 0x1f;
1198                 fep->mii_if.reg_num_mask = 0x1f;
1199                 fep->mii_if.phy_id = fec_mii_phy_id_detect(dev);
1200         }
1201
1202         *devp = dev;
1203
1204         return 0;
1205
1206       err:
1207         if (dev != NULL) {
1208                 if (fecp != NULL)
1209                         fec_whack_reset(fecp);
1210
1211                 if (registered)
1212                         unregister_netdev(dev);
1213
1214                 if (fep != NULL) {
1215                         if (fep->ring_base)
1216                                 dma_free_coherent(NULL,
1217                                                   (fpi->tx_ring +
1218                                                    fpi->rx_ring) *
1219                                                   sizeof(cbd_t), fep->ring_base,
1220                                                   fep->ring_mem_addr);
1221                 }
1222                 free_netdev(dev);
1223         }
1224         return err;
1225 }
1226
1227 int fec_8xx_cleanup_one(struct net_device *dev)
1228 {
1229         struct fec_enet_private *fep = netdev_priv(dev);
1230         fec_t *fecp = fep->fecp;
1231         const struct fec_platform_info *fpi = fep->fpi;
1232
1233         fec_whack_reset(fecp);
1234
1235         unregister_netdev(dev);
1236
1237         dma_free_coherent(NULL, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
1238                           fep->ring_base, fep->ring_mem_addr);
1239
1240         free_netdev(dev);
1241
1242         return 0;
1243 }
1244
1245 /**************************************************************************************/
1246 /**************************************************************************************/
1247 /**************************************************************************************/
1248
1249 static int __init fec_8xx_init(void)
1250 {
1251         return fec_8xx_platform_init();
1252 }
1253
1254 static void __exit fec_8xx_cleanup(void)
1255 {
1256         fec_8xx_platform_cleanup();
1257 }
1258
1259 /**************************************************************************************/
1260 /**************************************************************************************/
1261 /**************************************************************************************/
1262
1263 module_init(fec_8xx_init);
1264 module_exit(fec_8xx_cleanup);