drivers/net/greth.c

   1 /*
   2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
   3  *
   4  * 2005-2009 (c) Aeroflex Gaisler AB
   5  *
   6  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
   7  * available in the GRLIB VHDL IP core library.
   8  *
   9  * Full documentation of both cores can be found here:
  10  * http://www.gaisler.com/products/grlib/grip.pdf
  11  *
  12  * The Gigabit version supports scatter/gather DMA, any alignment of
  13  * buffers and checksum offloading.
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the
  17  * Free Software Foundation; either version 2 of the License, or (at your
  18  * option) any later version.
  19  *
  20  * Contributors: Kristoffer Glembo
  21  *               Daniel Hellstrom
  22  *               Marko Isomaki
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/init.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/io.h>
  33 #include <linux/crc32.h>
  34 #include <linux/mii.h>
  35 #include <linux/of_device.h>
  36 #include <linux/of_platform.h>
  37 #include <linux/slab.h>
  38 #include <asm/cacheflush.h>
  39 #include <asm/byteorder.h>
  40
  41 #ifdef CONFIG_SPARC
  42 #include <asm/idprom.h>
  43 #endif
  44
  45 #include "greth.h"
  46
  47 #define GRETH_DEF_MSG_ENABLE      \
  48         (NETIF_MSG_DRV          | \
  49          NETIF_MSG_PROBE        | \
  50          NETIF_MSG_LINK         | \
  51          NETIF_MSG_IFDOWN       | \
  52          NETIF_MSG_IFUP         | \
  53          NETIF_MSG_RX_ERR       | \
  54          NETIF_MSG_TX_ERR)
  55
  56 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  57 module_param(greth_debug, int, 0);
  58 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  59
  60 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  61 static int macaddr[6];
  62 module_param_array(macaddr, int, NULL, 0);
  63 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  64
  65 static int greth_edcl = 1;
  66 module_param(greth_edcl, int, 0);
  67 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  68
  69 static int greth_open(struct net_device *dev);
  70 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  71            struct net_device *dev);
  72 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  73            struct net_device *dev);
  74 static int greth_rx(struct net_device *dev, int limit);
  75 static int greth_rx_gbit(struct net_device *dev, int limit);
  76 static void greth_clean_tx(struct net_device *dev);
  77 static void greth_clean_tx_gbit(struct net_device *dev);
  78 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  79 static int greth_close(struct net_device *dev);
  80 static int greth_set_mac_add(struct net_device *dev, void *p);
  81 static void greth_set_multicast_list(struct net_device *dev);
  82
  83 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  84 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  85 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  86 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  87
  88 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  89 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  90 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  91
  92 static void greth_print_rx_packet(void *addr, int len)
  93 {
  94         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  95                         addr, len, true);
  96 }
  97
  98 static void greth_print_tx_packet(struct sk_buff *skb)
  99 {
 100         int i;
 101         int length;
 102
 103         if (skb_shinfo(skb)->nr_frags == 0)
 104                 length = skb->len;
 105         else
 106                 length = skb_headlen(skb);
 107
 108         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 109                         skb->data, length, true);
 110
 111         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 112
 113                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 114                                phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
 115                                skb_shinfo(skb)->frags[i].page_offset,
 116                                length, true);
 117         }
 118 }
 119
 120 static inline void greth_enable_tx(struct greth_private *greth)
 121 {
 122         wmb();
 123         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 124 }
 125
 126 static inline void greth_disable_tx(struct greth_private *greth)
 127 {
 128         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 129 }
 130
 131 static inline void greth_enable_rx(struct greth_private *greth)
 132 {
 133         wmb();
 134         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 135 }
 136
 137 static inline void greth_disable_rx(struct greth_private *greth)
 138 {
 139         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 140 }
 141
 142 static inline void greth_enable_irqs(struct greth_private *greth)
 143 {
 144         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 145 }
 146
 147 static inline void greth_disable_irqs(struct greth_private *greth)
 148 {
 149         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 150 }
 151
 152 static inline void greth_write_bd(u32 *bd, u32 val)
 153 {
 154         __raw_writel(cpu_to_be32(val), bd);
 155 }
 156
 157 static inline u32 greth_read_bd(u32 *bd)
 158 {
 159         return be32_to_cpu(__raw_readl(bd));
 160 }
 161
 162 static void greth_clean_rings(struct greth_private *greth)
 163 {
 164         int i;
 165         struct greth_bd *rx_bdp = greth->rx_bd_base;
 166         struct greth_bd *tx_bdp = greth->tx_bd_base;
 167
 168         if (greth->gbit_mac) {
 169
 170                 /* Free and unmap RX buffers */
 171                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 172                         if (greth->rx_skbuff[i] != NULL) {
 173                                 dev_kfree_skb(greth->rx_skbuff[i]);
 174                                 dma_unmap_single(greth->dev,
 175                                                  greth_read_bd(&rx_bdp->addr),
 176                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 177                                                  DMA_FROM_DEVICE);
 178                         }
 179                 }
 180
 181                 /* TX buffers */
 182                 while (greth->tx_free < GRETH_TXBD_NUM) {
 183
 184                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 185                         int nr_frags = skb_shinfo(skb)->nr_frags;
 186                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 187                         greth->tx_last = NEXT_TX(greth->tx_last);
 188
 189                         dma_unmap_single(greth->dev,
 190                                          greth_read_bd(&tx_bdp->addr),
 191                                          skb_headlen(skb),
 192                                          DMA_TO_DEVICE);
 193
 194                         for (i = 0; i < nr_frags; i++) {
 195                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 196                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 197
 198                                 dma_unmap_page(greth->dev,
 199                                                greth_read_bd(&tx_bdp->addr),
 200                                                frag->size,
 201                                                DMA_TO_DEVICE);
 202
 203                                 greth->tx_last = NEXT_TX(greth->tx_last);
 204                         }
 205                         greth->tx_free += nr_frags+1;
 206                         dev_kfree_skb(skb);
 207                 }
 208
 209
 210         } else { /* 10/100 Mbps MAC */
 211
 212                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 213                         kfree(greth->rx_bufs[i]);
 214                         dma_unmap_single(greth->dev,
 215                                          greth_read_bd(&rx_bdp->addr),
 216                                          MAX_FRAME_SIZE,
 217                                          DMA_FROM_DEVICE);
 218                 }
 219                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 220                         kfree(greth->tx_bufs[i]);
 221                         dma_unmap_single(greth->dev,
 222                                          greth_read_bd(&tx_bdp->addr),
 223                                          MAX_FRAME_SIZE,
 224                                          DMA_TO_DEVICE);
 225                 }
 226         }
 227 }
 228
 229 static int greth_init_rings(struct greth_private *greth)
 230 {
 231         struct sk_buff *skb;
 232         struct greth_bd *rx_bd, *tx_bd;
 233         u32 dma_addr;
 234         int i;
 235
 236         rx_bd = greth->rx_bd_base;
 237         tx_bd = greth->tx_bd_base;
 238
 239         /* Initialize descriptor rings and buffers */
 240         if (greth->gbit_mac) {
 241
 242                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 243                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 244                         if (skb == NULL) {
 245                                 if (netif_msg_ifup(greth))
 246                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 247                                 goto cleanup;
 248                         }
 249                         skb_reserve(skb, NET_IP_ALIGN);
 250                         dma_addr = dma_map_single(greth->dev,
 251                                                   skb->data,
 252                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 253                                                   DMA_FROM_DEVICE);
 254
 255                         if (dma_mapping_error(greth->dev, dma_addr)) {
 256                                 if (netif_msg_ifup(greth))
 257                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 258                                 goto cleanup;
 259                         }
 260                         greth->rx_skbuff[i] = skb;
 261                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 262                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 263                 }
 264
 265         } else {
 266
 267                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 268                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 269
 270                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 271
 272                         if (greth->rx_bufs[i] == NULL) {
 273                                 if (netif_msg_ifup(greth))
 274                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 275                                 goto cleanup;
 276                         }
 277
 278                         dma_addr = dma_map_single(greth->dev,
 279                                                   greth->rx_bufs[i],
 280                                                   MAX_FRAME_SIZE,
 281                                                   DMA_FROM_DEVICE);
 282
 283                         if (dma_mapping_error(greth->dev, dma_addr)) {
 284                                 if (netif_msg_ifup(greth))
 285                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 286                                 goto cleanup;
 287                         }
 288                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 289                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 290                 }
 291                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 292
 293                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 294
 295                         if (greth->tx_bufs[i] == NULL) {
 296                                 if (netif_msg_ifup(greth))
 297                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 298                                 goto cleanup;
 299                         }
 300
 301                         dma_addr = dma_map_single(greth->dev,
 302                                                   greth->tx_bufs[i],
 303                                                   MAX_FRAME_SIZE,
 304                                                   DMA_TO_DEVICE);
 305
 306                         if (dma_mapping_error(greth->dev, dma_addr)) {
 307                                 if (netif_msg_ifup(greth))
 308                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 309                                 goto cleanup;
 310                         }
 311                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 312                         greth_write_bd(&tx_bd[i].stat, 0);
 313                 }
 314         }
 315         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 316                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 317
 318         /* Initialize pointers. */
 319         greth->rx_cur = 0;
 320         greth->tx_next = 0;
 321         greth->tx_last = 0;
 322         greth->tx_free = GRETH_TXBD_NUM;
 323
 324         /* Initialize descriptor base address */
 325         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 326         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 327
 328         return 0;
 329
 330 cleanup:
 331         greth_clean_rings(greth);
 332         return -ENOMEM;
 333 }
 334
 335 static int greth_open(struct net_device *dev)
 336 {
 337         struct greth_private *greth = netdev_priv(dev);
 338         int err;
 339
 340         err = greth_init_rings(greth);
 341         if (err) {
 342                 if (netif_msg_ifup(greth))
 343                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 344                 return err;
 345         }
 346
 347         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 348         if (err) {
 349                 if (netif_msg_ifup(greth))
 350                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 351                 greth_clean_rings(greth);
 352                 return err;
 353         }
 354
 355         if (netif_msg_ifup(greth))
 356                 dev_dbg(&dev->dev, " starting queue\n");
 357         netif_start_queue(dev);
 358
 359         GRETH_REGSAVE(greth->regs->status, 0xFF);
 360
 361         napi_enable(&greth->napi);
 362
 363         greth_enable_irqs(greth);
 364         greth_enable_tx(greth);
 365         greth_enable_rx(greth);
 366         return 0;
 367
 368 }
 369
 370 static int greth_close(struct net_device *dev)
 371 {
 372         struct greth_private *greth = netdev_priv(dev);
 373
 374         napi_disable(&greth->napi);
 375
 376         greth_disable_irqs(greth);
 377         greth_disable_tx(greth);
 378         greth_disable_rx(greth);
 379
 380         netif_stop_queue(dev);
 381
 382         free_irq(greth->irq, (void *) dev);
 383
 384         greth_clean_rings(greth);
 385
 386         return 0;
 387 }
 388
 389 static netdev_tx_t
 390 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 391 {
 392         struct greth_private *greth = netdev_priv(dev);
 393         struct greth_bd *bdp;
 394         int err = NETDEV_TX_OK;
 395         u32 status, dma_addr;
 396
 397         bdp = greth->tx_bd_base + greth->tx_next;
 398
 399         if (unlikely(greth->tx_free <= 0)) {
 400                 netif_stop_queue(dev);
 401                 return NETDEV_TX_BUSY;
 402         }
 403
 404         if (netif_msg_pktdata(greth))
 405                 greth_print_tx_packet(skb);
 406
 407
 408         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 409                 dev->stats.tx_errors++;
 410                 goto out;
 411         }
 412
 413         dma_addr = greth_read_bd(&bdp->addr);
 414
 415         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 416
 417         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 418
 419         status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);
 420
 421         /* Wrap around descriptor ring */
 422         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 423                 status |= GRETH_BD_WR;
 424         }
 425
 426         greth->tx_next = NEXT_TX(greth->tx_next);
 427         greth->tx_free--;
 428
 429         /* No more descriptors */
 430         if (unlikely(greth->tx_free == 0)) {
 431
 432                 /* Free transmitted descriptors */
 433                 greth_clean_tx(dev);
 434
 435                 /* If nothing was cleaned, stop queue & wait for irq */
 436                 if (unlikely(greth->tx_free == 0)) {
 437                         status |= GRETH_BD_IE;
 438                         netif_stop_queue(dev);
 439                 }
 440         }
 441
 442         /* Write descriptor control word and enable transmission */
 443         greth_write_bd(&bdp->stat, status);
 444         greth_enable_tx(greth);
 445
 446 out:
 447         dev_kfree_skb(skb);
 448         return err;
 449 }
 450
 451
 452 static netdev_tx_t
 453 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 454 {
 455         struct greth_private *greth = netdev_priv(dev);
 456         struct greth_bd *bdp;
 457         u32 status = 0, dma_addr;
 458         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 459
 460         nr_frags = skb_shinfo(skb)->nr_frags;
 461
 462         if (greth->tx_free < nr_frags + 1) {
 463                 netif_stop_queue(dev);
 464                 err = NETDEV_TX_BUSY;
 465                 goto out;
 466         }
 467
 468         if (netif_msg_pktdata(greth))
 469                 greth_print_tx_packet(skb);
 470
 471         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 472                 dev->stats.tx_errors++;
 473                 goto out;
 474         }
 475
 476         /* Save skb pointer. */
 477         greth->tx_skbuff[greth->tx_next] = skb;
 478
 479         /* Linear buf */
 480         if (nr_frags != 0)
 481                 status = GRETH_TXBD_MORE;
 482
 483         status |= GRETH_TXBD_CSALL;
 484         status |= skb_headlen(skb) & GRETH_BD_LEN;
 485         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 486                 status |= GRETH_BD_WR;
 487
 488
 489         bdp = greth->tx_bd_base + greth->tx_next;
 490         greth_write_bd(&bdp->stat, status);
 491         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 492
 493         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 494                 goto map_error;
 495
 496         greth_write_bd(&bdp->addr, dma_addr);
 497
 498         curr_tx = NEXT_TX(greth->tx_next);
 499
 500         /* Frags */
 501         for (i = 0; i < nr_frags; i++) {
 502                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 503                 greth->tx_skbuff[curr_tx] = NULL;
 504                 bdp = greth->tx_bd_base + curr_tx;
 505
 506                 status = GRETH_TXBD_CSALL;
 507                 status |= frag->size & GRETH_BD_LEN;
 508
 509                 /* Wrap around descriptor ring */
 510                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 511                         status |= GRETH_BD_WR;
 512
 513                 /* More fragments left */
 514                 if (i < nr_frags - 1)
 515                         status |= GRETH_TXBD_MORE;
 516
 517                 /* ... last fragment, check if out of descriptors  */
 518                 else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {
 519
 520                         /* Enable interrupts and stop queue */
 521                         status |= GRETH_BD_IE;
 522                         netif_stop_queue(dev);
 523                 }
 524
 525                 greth_write_bd(&bdp->stat, status);
 526
 527                 dma_addr = dma_map_page(greth->dev,
 528                                         frag->page,
 529                                         frag->page_offset,
 530                                         frag->size,
 531                                         DMA_TO_DEVICE);
 532
 533                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 534                         goto frag_map_error;
 535
 536                 greth_write_bd(&bdp->addr, dma_addr);
 537
 538                 curr_tx = NEXT_TX(curr_tx);
 539         }
 540
 541         wmb();
 542
 543         /* Enable the descriptors that we configured ...  */
 544         for (i = 0; i < nr_frags + 1; i++) {
 545                 bdp = greth->tx_bd_base + greth->tx_next;
 546                 greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 547                 greth->tx_next = NEXT_TX(greth->tx_next);
 548                 greth->tx_free--;
 549         }
 550
 551         greth_enable_tx(greth);
 552
 553         return NETDEV_TX_OK;
 554
 555 frag_map_error:
 556         /* Unmap SKB mappings that succeeded */
 557         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 558                 bdp = greth->tx_bd_base + greth->tx_next + i;
 559                 dma_unmap_single(greth->dev,
 560                                  greth_read_bd(&bdp->addr),
 561                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 562                                  DMA_TO_DEVICE);
 563         }
 564 map_error:
 565         if (net_ratelimit())
 566                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 567         dev_kfree_skb(skb);
 568 out:
 569         return err;
 570 }
 571
 572
 573 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 574 {
 575         struct net_device *dev = dev_id;
 576         struct greth_private *greth;
 577         u32 status;
 578         irqreturn_t retval = IRQ_NONE;
 579
 580         greth = netdev_priv(dev);
 581
 582         spin_lock(&greth->devlock);
 583
 584         /* Get the interrupt events that caused us to be here. */
 585         status = GRETH_REGLOAD(greth->regs->status);
 586
 587         /* Handle rx and tx interrupts through poll */
 588         if (status & (GRETH_INT_RX | GRETH_INT_TX)) {
 589
 590                 /* Clear interrupt status */
 591                 GRETH_REGORIN(greth->regs->status,
 592                               status & (GRETH_INT_RX | GRETH_INT_TX));
 593
 594                 retval = IRQ_HANDLED;
 595
 596                 /* Disable interrupts and schedule poll() */
 597                 greth_disable_irqs(greth);
 598                 napi_schedule(&greth->napi);
 599         }
 600
 601         mmiowb();
 602         spin_unlock(&greth->devlock);
 603
 604         return retval;
 605 }
 606
 607 static void greth_clean_tx(struct net_device *dev)
 608 {
 609         struct greth_private *greth;
 610         struct greth_bd *bdp;
 611         u32 stat;
 612
 613         greth = netdev_priv(dev);
 614
 615         while (1) {
 616                 bdp = greth->tx_bd_base + greth->tx_last;
 617                 stat = greth_read_bd(&bdp->stat);
 618
 619                 if (unlikely(stat & GRETH_BD_EN))
 620                         break;
 621
 622                 if (greth->tx_free == GRETH_TXBD_NUM)
 623                         break;
 624
 625                 /* Check status for errors */
 626                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 627                         dev->stats.tx_errors++;
 628                         if (stat & GRETH_TXBD_ERR_AL)
 629                                 dev->stats.tx_aborted_errors++;
 630                         if (stat & GRETH_TXBD_ERR_UE)
 631                                 dev->stats.tx_fifo_errors++;
 632                 }
 633                 dev->stats.tx_packets++;
 634                 greth->tx_last = NEXT_TX(greth->tx_last);
 635                 greth->tx_free++;
 636         }
 637
 638         if (greth->tx_free > 0) {
 639                 netif_wake_queue(dev);
 640         }
 641
 642 }
 643
 644 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 645 {
 646         /* Check status for errors */
 647         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 648                 dev->stats.tx_errors++;
 649                 if (stat & GRETH_TXBD_ERR_AL)
 650                         dev->stats.tx_aborted_errors++;
 651                 if (stat & GRETH_TXBD_ERR_UE)
 652                         dev->stats.tx_fifo_errors++;
 653                 if (stat & GRETH_TXBD_ERR_LC)
 654                         dev->stats.tx_aborted_errors++;
 655         }
 656         dev->stats.tx_packets++;
 657 }
 658
 659 static void greth_clean_tx_gbit(struct net_device *dev)
 660 {
 661         struct greth_private *greth;
 662         struct greth_bd *bdp, *bdp_last_frag;
 663         struct sk_buff *skb;
 664         u32 stat;
 665         int nr_frags, i;
 666
 667         greth = netdev_priv(dev);
 668
 669         while (greth->tx_free < GRETH_TXBD_NUM) {
 670
 671                 skb = greth->tx_skbuff[greth->tx_last];
 672
 673                 nr_frags = skb_shinfo(skb)->nr_frags;
 674
 675                 /* We only clean fully completed SKBs */
 676                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
 677                 stat = bdp_last_frag->stat;
 678
 679                 if (stat & GRETH_BD_EN)
 680                         break;
 681
 682                 greth->tx_skbuff[greth->tx_last] = NULL;
 683
 684                 greth_update_tx_stats(dev, stat);
 685
 686                 bdp = greth->tx_bd_base + greth->tx_last;
 687
 688                 greth->tx_last = NEXT_TX(greth->tx_last);
 689
 690                 dma_unmap_single(greth->dev,
 691                                  greth_read_bd(&bdp->addr),
 692                                  skb_headlen(skb),
 693                                  DMA_TO_DEVICE);
 694
 695                 for (i = 0; i < nr_frags; i++) {
 696                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 697                         bdp = greth->tx_bd_base + greth->tx_last;
 698
 699                         dma_unmap_page(greth->dev,
 700                                        greth_read_bd(&bdp->addr),
 701                                        frag->size,
 702                                        DMA_TO_DEVICE);
 703
 704                         greth->tx_last = NEXT_TX(greth->tx_last);
 705                 }
 706                 greth->tx_free += nr_frags+1;
 707                 dev_kfree_skb(skb);
 708         }
 709         if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
 710                 netif_wake_queue(dev);
 711         }
 712 }
 713
 714 static int greth_pending_packets(struct greth_private *greth)
 715 {
 716         struct greth_bd *bdp;
 717         u32 status;
 718         bdp = greth->rx_bd_base + greth->rx_cur;
 719         status = greth_read_bd(&bdp->stat);
 720         if (status & GRETH_BD_EN)
 721                 return 0;
 722         else
 723                 return 1;
 724 }
 725
 726 static int greth_rx(struct net_device *dev, int limit)
 727 {
 728         struct greth_private *greth;
 729         struct greth_bd *bdp;
 730         struct sk_buff *skb;
 731         int pkt_len;
 732         int bad, count;
 733         u32 status, dma_addr;
 734
 735         greth = netdev_priv(dev);
 736
 737         for (count = 0; count < limit; ++count) {
 738
 739                 bdp = greth->rx_bd_base + greth->rx_cur;
 740                 status = greth_read_bd(&bdp->stat);
 741                 dma_addr = greth_read_bd(&bdp->addr);
 742                 bad = 0;
 743
 744                 if (unlikely(status & GRETH_BD_EN)) {
 745                         break;
 746                 }
 747
 748                 /* Check status for errors. */
 749                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 750                         if (status & GRETH_RXBD_ERR_FT) {
 751                                 dev->stats.rx_length_errors++;
 752                                 bad = 1;
 753                         }
 754                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 755                                 dev->stats.rx_frame_errors++;
 756                                 bad = 1;
 757                         }
 758                         if (status & GRETH_RXBD_ERR_CRC) {
 759                                 dev->stats.rx_crc_errors++;
 760                                 bad = 1;
 761                         }
 762                 }
 763                 if (unlikely(bad)) {
 764                         dev->stats.rx_errors++;
 765
 766                 } else {
 767
 768                         pkt_len = status & GRETH_BD_LEN;
 769
 770                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 771
 772                         if (unlikely(skb == NULL)) {
 773
 774                                 if (net_ratelimit())
 775                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 776
 777                                 dev->stats.rx_dropped++;
 778
 779                         } else {
 780                                 skb_reserve(skb, NET_IP_ALIGN);
 781                                 skb->dev = dev;
 782
 783                                 dma_sync_single_for_cpu(greth->dev,
 784                                                         dma_addr,
 785                                                         pkt_len,
 786                                                         DMA_FROM_DEVICE);
 787
 788                                 if (netif_msg_pktdata(greth))
 789                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 790
 791                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
 792
 793                                 skb->protocol = eth_type_trans(skb, dev);
 794                                 dev->stats.rx_packets++;
 795                                 netif_receive_skb(skb);
 796                         }
 797                 }
 798
 799                 status = GRETH_BD_EN | GRETH_BD_IE;
 800                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 801                         status |= GRETH_BD_WR;
 802                 }
 803
 804                 wmb();
 805                 greth_write_bd(&bdp->stat, status);
 806
 807                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 808
 809                 greth_enable_rx(greth);
 810
 811                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 812         }
 813
 814         return count;
 815 }
 816
 817 static inline int hw_checksummed(u32 status)
 818 {
 819
 820         if (status & GRETH_RXBD_IP_FRAG)
 821                 return 0;
 822
 823         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 824                 return 0;
 825
 826         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 827                 return 0;
 828
 829         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 830                 return 0;
 831
 832         return 1;
 833 }
 834
 835 static int greth_rx_gbit(struct net_device *dev, int limit)
 836 {
 837         struct greth_private *greth;
 838         struct greth_bd *bdp;
 839         struct sk_buff *skb, *newskb;
 840         int pkt_len;
 841         int bad, count = 0;
 842         u32 status, dma_addr;
 843
 844         greth = netdev_priv(dev);
 845
 846         for (count = 0; count < limit; ++count) {
 847
 848                 bdp = greth->rx_bd_base + greth->rx_cur;
 849                 skb = greth->rx_skbuff[greth->rx_cur];
 850                 status = greth_read_bd(&bdp->stat);
 851                 bad = 0;
 852
 853                 if (status & GRETH_BD_EN)
 854                         break;
 855
 856                 /* Check status for errors. */
 857                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 858
 859                         if (status & GRETH_RXBD_ERR_FT) {
 860                                 dev->stats.rx_length_errors++;
 861                                 bad = 1;
 862                         } else if (status &
 863                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 864                                 dev->stats.rx_frame_errors++;
 865                                 bad = 1;
 866                         } else if (status & GRETH_RXBD_ERR_CRC) {
 867                                 dev->stats.rx_crc_errors++;
 868                                 bad = 1;
 869                         }
 870                 }
 871
 872                 /* Allocate new skb to replace current */
 873                 newskb = netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN);
 874
 875                 if (!bad && newskb) {
 876                         skb_reserve(newskb, NET_IP_ALIGN);
 877
 878                         dma_addr = dma_map_single(greth->dev,
 879                                                       newskb->data,
 880                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 881                                                       DMA_FROM_DEVICE);
 882
 883                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 884                                 /* Process the incoming frame. */
 885                                 pkt_len = status & GRETH_BD_LEN;
 886
 887                                 dma_unmap_single(greth->dev,
 888                                                  greth_read_bd(&bdp->addr),
 889                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 890                                                  DMA_FROM_DEVICE);
 891
 892                                 if (netif_msg_pktdata(greth))
 893                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 894
 895                                 skb_put(skb, pkt_len);
 896
 897                                 if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
 898                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 899                                 else
 900                                         skb_checksum_none_assert(skb);
 901
 902                                 skb->protocol = eth_type_trans(skb, dev);
 903                                 dev->stats.rx_packets++;
 904                                 netif_receive_skb(skb);
 905
 906                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 907                                 greth_write_bd(&bdp->addr, dma_addr);
 908                         } else {
 909                                 if (net_ratelimit())
 910                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 911                                 dev_kfree_skb(newskb);
 912                                 dev->stats.rx_dropped++;
 913                         }
 914                 } else {
 915                         if (net_ratelimit())
 916                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 917                         dev->stats.rx_dropped++;
 918                 }
 919
 920                 status = GRETH_BD_EN | GRETH_BD_IE;
 921                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 922                         status |= GRETH_BD_WR;
 923                 }
 924
 925                 wmb();
 926                 greth_write_bd(&bdp->stat, status);
 927                 greth_enable_rx(greth);
 928                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 929         }
 930
 931         return count;
 932
 933 }
 934
 935 static int greth_poll(struct napi_struct *napi, int budget)
 936 {
 937         struct greth_private *greth;
 938         int work_done = 0;
 939         greth = container_of(napi, struct greth_private, napi);
 940
 941         if (greth->gbit_mac) {
 942                 greth_clean_tx_gbit(greth->netdev);
 943         } else {
 944                 greth_clean_tx(greth->netdev);
 945         }
 946
 947 restart_poll:
 948         if (greth->gbit_mac) {
 949                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 950         } else {
 951                 work_done += greth_rx(greth->netdev, budget - work_done);
 952         }
 953
 954         if (work_done < budget) {
 955
 956                 napi_complete(napi);
 957
 958                 if (greth_pending_packets(greth)) {
 959                         napi_reschedule(napi);
 960                         goto restart_poll;
 961                 }
 962         }
 963
 964         greth_enable_irqs(greth);
 965         return work_done;
 966 }
 967
 968 static int greth_set_mac_add(struct net_device *dev, void *p)
 969 {
 970         struct sockaddr *addr = p;
 971         struct greth_private *greth;
 972         struct greth_regs *regs;
 973
 974         greth = netdev_priv(dev);
 975         regs = (struct greth_regs *) greth->regs;
 976
 977         if (!is_valid_ether_addr(addr->sa_data))
 978                 return -EINVAL;
 979
 980         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 981
 982         GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
 983         GRETH_REGSAVE(regs->esa_lsb,
 984                       addr->sa_data[2] << 24 | addr->
 985                       sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
 986         return 0;
 987 }
 988
 989 static u32 greth_hash_get_index(__u8 *addr)
 990 {
 991         return (ether_crc(6, addr)) & 0x3F;
 992 }
 993
 994 static void greth_set_hash_filter(struct net_device *dev)
 995 {
 996         struct netdev_hw_addr *ha;
 997         struct greth_private *greth = netdev_priv(dev);
 998         struct greth_regs *regs = (struct greth_regs *) greth->regs;
 999         u32 mc_filter[2];
1000         unsigned int bitnr;
1001
1002         mc_filter[0] = mc_filter[1] = 0;
1003
1004         netdev_for_each_mc_addr(ha, dev) {
1005                 bitnr = greth_hash_get_index(ha->addr);
1006                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1007         }
1008
1009         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1010         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1011 }
1012
1013 static void greth_set_multicast_list(struct net_device *dev)
1014 {
1015         int cfg;
1016         struct greth_private *greth = netdev_priv(dev);
1017         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1018
1019         cfg = GRETH_REGLOAD(regs->control);
1020         if (dev->flags & IFF_PROMISC)
1021                 cfg |= GRETH_CTRL_PR;
1022         else
1023                 cfg &= ~GRETH_CTRL_PR;
1024
1025         if (greth->multicast) {
1026                 if (dev->flags & IFF_ALLMULTI) {
1027                         GRETH_REGSAVE(regs->hash_msb, -1);
1028                         GRETH_REGSAVE(regs->hash_lsb, -1);
1029                         cfg |= GRETH_CTRL_MCEN;
1030                         GRETH_REGSAVE(regs->control, cfg);
1031                         return;
1032                 }
1033
1034                 if (netdev_mc_empty(dev)) {
1035                         cfg &= ~GRETH_CTRL_MCEN;
1036                         GRETH_REGSAVE(regs->control, cfg);
1037                         return;
1038                 }
1039
1040                 /* Setup multicast filter */
1041                 greth_set_hash_filter(dev);
1042                 cfg |= GRETH_CTRL_MCEN;
1043         }
1044         GRETH_REGSAVE(regs->control, cfg);
1045 }
1046
1047 static u32 greth_get_msglevel(struct net_device *dev)
1048 {
1049         struct greth_private *greth = netdev_priv(dev);
1050         return greth->msg_enable;
1051 }
1052
1053 static void greth_set_msglevel(struct net_device *dev, u32 value)
1054 {
1055         struct greth_private *greth = netdev_priv(dev);
1056         greth->msg_enable = value;
1057 }
1058 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1059 {
1060         struct greth_private *greth = netdev_priv(dev);
1061         struct phy_device *phy = greth->phy;
1062
1063         if (!phy)
1064                 return -ENODEV;
1065
1066         return phy_ethtool_gset(phy, cmd);
1067 }
1068
1069 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1070 {
1071         struct greth_private *greth = netdev_priv(dev);
1072         struct phy_device *phy = greth->phy;
1073
1074         if (!phy)
1075                 return -ENODEV;
1076
1077         return phy_ethtool_sset(phy, cmd);
1078 }
1079
1080 static int greth_get_regs_len(struct net_device *dev)
1081 {
1082         return sizeof(struct greth_regs);
1083 }
1084
1085 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1086 {
1087         struct greth_private *greth = netdev_priv(dev);
1088
1089         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1090         strncpy(info->version, "revision: 1.0", 32);
1091         strncpy(info->bus_info, greth->dev->bus->name, 32);
1092         strncpy(info->fw_version, "N/A", 32);
1093         info->eedump_len = 0;
1094         info->regdump_len = sizeof(struct greth_regs);
1095 }
1096
1097 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1098 {
1099         int i;
1100         struct greth_private *greth = netdev_priv(dev);
1101         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1102         u32 *buff = p;
1103
1104         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1105                 buff[i] = greth_read_bd(&greth_regs[i]);
1106 }
1107
1108 static u32 greth_get_rx_csum(struct net_device *dev)
1109 {
1110         struct greth_private *greth = netdev_priv(dev);
1111         return (greth->flags & GRETH_FLAG_RX_CSUM) != 0;
1112 }
1113
1114 static int greth_set_rx_csum(struct net_device *dev, u32 data)
1115 {
1116         struct greth_private *greth = netdev_priv(dev);
1117
1118         spin_lock_bh(&greth->devlock);
1119
1120         if (data)
1121                 greth->flags |= GRETH_FLAG_RX_CSUM;
1122         else
1123                 greth->flags &= ~GRETH_FLAG_RX_CSUM;
1124
1125         spin_unlock_bh(&greth->devlock);
1126
1127         return 0;
1128 }
1129
1130 static u32 greth_get_tx_csum(struct net_device *dev)
1131 {
1132         return (dev->features & NETIF_F_IP_CSUM) != 0;
1133 }
1134
1135 static int greth_set_tx_csum(struct net_device *dev, u32 data)
1136 {
1137         netif_tx_lock_bh(dev);
1138         ethtool_op_set_tx_csum(dev, data);
1139         netif_tx_unlock_bh(dev);
1140         return 0;
1141 }
1142
1143 static const struct ethtool_ops greth_ethtool_ops = {
1144         .get_msglevel           = greth_get_msglevel,
1145         .set_msglevel           = greth_set_msglevel,
1146         .get_settings           = greth_get_settings,
1147         .set_settings           = greth_set_settings,
1148         .get_drvinfo            = greth_get_drvinfo,
1149         .get_regs_len           = greth_get_regs_len,
1150         .get_regs               = greth_get_regs,
1151         .get_rx_csum            = greth_get_rx_csum,
1152         .set_rx_csum            = greth_set_rx_csum,
1153         .get_tx_csum            = greth_get_tx_csum,
1154         .set_tx_csum            = greth_set_tx_csum,
1155         .get_link               = ethtool_op_get_link,
1156 };
1157
1158 static struct net_device_ops greth_netdev_ops = {
1159         .ndo_open = greth_open,
1160         .ndo_stop = greth_close,
1161         .ndo_start_xmit = greth_start_xmit,
1162         .ndo_set_mac_address = greth_set_mac_add,
1163         .ndo_validate_addr      = eth_validate_addr,
1164 };
1165
1166 static inline int wait_for_mdio(struct greth_private *greth)
1167 {
1168         unsigned long timeout = jiffies + 4*HZ/100;
1169         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1170                 if (time_after(jiffies, timeout))
1171                         return 0;
1172         }
1173         return 1;
1174 }
1175
1176 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1177 {
1178         struct greth_private *greth = bus->priv;
1179         int data;
1180
1181         if (!wait_for_mdio(greth))
1182                 return -EBUSY;
1183
1184         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1185
1186         if (!wait_for_mdio(greth))
1187                 return -EBUSY;
1188
1189         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1190                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1191                 return data;
1192
1193         } else {
1194                 return -1;
1195         }
1196 }
1197
1198 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1199 {
1200         struct greth_private *greth = bus->priv;
1201
1202         if (!wait_for_mdio(greth))
1203                 return -EBUSY;
1204
1205         GRETH_REGSAVE(greth->regs->mdio,
1206                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1207
1208         if (!wait_for_mdio(greth))
1209                 return -EBUSY;
1210
1211         return 0;
1212 }
1213
1214 static int greth_mdio_reset(struct mii_bus *bus)
1215 {
1216         return 0;
1217 }
1218
1219 static void greth_link_change(struct net_device *dev)
1220 {
1221         struct greth_private *greth = netdev_priv(dev);
1222         struct phy_device *phydev = greth->phy;
1223         unsigned long flags;
1224
1225         int status_change = 0;
1226
1227         spin_lock_irqsave(&greth->devlock, flags);
1228
1229         if (phydev->link) {
1230
1231                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1232
1233                         GRETH_REGANDIN(greth->regs->control,
1234                                        ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB));
1235
1236                         if (phydev->duplex)
1237                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_FD);
1238
1239                         if (phydev->speed == SPEED_100) {
1240
1241                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_SP);
1242                         }
1243
1244                         else if (phydev->speed == SPEED_1000)
1245                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_GB);
1246
1247                         greth->speed = phydev->speed;
1248                         greth->duplex = phydev->duplex;
1249                         status_change = 1;
1250                 }
1251         }
1252
1253         if (phydev->link != greth->link) {
1254                 if (!phydev->link) {
1255                         greth->speed = 0;
1256                         greth->duplex = -1;
1257                 }
1258                 greth->link = phydev->link;
1259
1260                 status_change = 1;
1261         }
1262
1263         spin_unlock_irqrestore(&greth->devlock, flags);
1264
1265         if (status_change) {
1266                 if (phydev->link)
1267                         pr_debug("%s: link up (%d/%s)\n",
1268                                 dev->name, phydev->speed,
1269                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1270                 else
1271                         pr_debug("%s: link down\n", dev->name);
1272         }
1273 }
1274
1275 static int greth_mdio_probe(struct net_device *dev)
1276 {
1277         struct greth_private *greth = netdev_priv(dev);
1278         struct phy_device *phy = NULL;
1279         int ret;
1280
1281         /* Find the first PHY */
1282         phy = phy_find_first(greth->mdio);
1283
1284         if (!phy) {
1285                 if (netif_msg_probe(greth))
1286                         dev_err(&dev->dev, "no PHY found\n");
1287                 return -ENXIO;
1288         }
1289
1290         ret = phy_connect_direct(dev, phy, &greth_link_change,
1291                         0, greth->gbit_mac ?
1292                         PHY_INTERFACE_MODE_GMII :
1293                         PHY_INTERFACE_MODE_MII);
1294         if (ret) {
1295                 if (netif_msg_ifup(greth))
1296                         dev_err(&dev->dev, "could not attach to PHY\n");
1297                 return ret;
1298         }
1299
1300         if (greth->gbit_mac)
1301                 phy->supported &= PHY_GBIT_FEATURES;
1302         else
1303                 phy->supported &= PHY_BASIC_FEATURES;
1304
1305         phy->advertising = phy->supported;
1306
1307         greth->link = 0;
1308         greth->speed = 0;
1309         greth->duplex = -1;
1310         greth->phy = phy;
1311
1312         return 0;
1313 }
1314
1315 static inline int phy_aneg_done(struct phy_device *phydev)
1316 {
1317         int retval;
1318
1319         retval = phy_read(phydev, MII_BMSR);
1320
1321         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1322 }
1323
1324 static int greth_mdio_init(struct greth_private *greth)
1325 {
1326         int ret, phy;
1327         unsigned long timeout;
1328
1329         greth->mdio = mdiobus_alloc();
1330         if (!greth->mdio) {
1331                 return -ENOMEM;
1332         }
1333
1334         greth->mdio->name = "greth-mdio";
1335         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1336         greth->mdio->read = greth_mdio_read;
1337         greth->mdio->write = greth_mdio_write;
1338         greth->mdio->reset = greth_mdio_reset;
1339         greth->mdio->priv = greth;
1340
1341         greth->mdio->irq = greth->mdio_irqs;
1342
1343         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1344                 greth->mdio->irq[phy] = PHY_POLL;
1345
1346         ret = mdiobus_register(greth->mdio);
1347         if (ret) {
1348                 goto error;
1349         }
1350
1351         ret = greth_mdio_probe(greth->netdev);
1352         if (ret) {
1353                 if (netif_msg_probe(greth))
1354                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1355                 goto unreg_mdio;
1356         }
1357
1358         phy_start(greth->phy);
1359
1360         /* If Ethernet debug link is used make autoneg happen right away */
1361         if (greth->edcl && greth_edcl == 1) {
1362                 phy_start_aneg(greth->phy);
1363                 timeout = jiffies + 6*HZ;
1364                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1365                 }
1366                 genphy_read_status(greth->phy);
1367                 greth_link_change(greth->netdev);
1368         }
1369
1370         return 0;
1371
1372 unreg_mdio:
1373         mdiobus_unregister(greth->mdio);
1374 error:
1375         mdiobus_free(greth->mdio);
1376         return ret;
1377 }
1378
1379 /* Initialize the GRETH MAC */
1380 static int __devinit greth_of_probe(struct platform_device *ofdev, const struct of_device_id *match)
1381 {
1382         struct net_device *dev;
1383         struct greth_private *greth;
1384         struct greth_regs *regs;
1385
1386         int i;
1387         int err;
1388         int tmp;
1389         unsigned long timeout;
1390
1391         dev = alloc_etherdev(sizeof(struct greth_private));
1392
1393         if (dev == NULL)
1394                 return -ENOMEM;
1395
1396         greth = netdev_priv(dev);
1397         greth->netdev = dev;
1398         greth->dev = &ofdev->dev;
1399
1400         if (greth_debug > 0)
1401                 greth->msg_enable = greth_debug;
1402         else
1403                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1404
1405         spin_lock_init(&greth->devlock);
1406
1407         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1408                                  resource_size(&ofdev->resource[0]),
1409                                  "grlib-greth regs");
1410
1411         if (greth->regs == NULL) {
1412                 if (netif_msg_probe(greth))
1413                         dev_err(greth->dev, "ioremap failure.\n");
1414                 err = -EIO;
1415                 goto error1;
1416         }
1417
1418         regs = (struct greth_regs *) greth->regs;
1419         greth->irq = ofdev->archdata.irqs[0];
1420
1421         dev_set_drvdata(greth->dev, dev);
1422         SET_NETDEV_DEV(dev, greth->dev);
1423
1424         if (netif_msg_probe(greth))
1425                 dev_dbg(greth->dev, "reseting controller.\n");
1426
1427         /* Reset the controller. */
1428         GRETH_REGSAVE(regs->control, GRETH_RESET);
1429
1430         /* Wait for MAC to reset itself */
1431         timeout = jiffies + HZ/100;
1432         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1433                 if (time_after(jiffies, timeout)) {
1434                         err = -EIO;
1435                         if (netif_msg_probe(greth))
1436                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1437                         goto error2;
1438                 }
1439         }
1440
1441         /* Get default PHY address  */
1442         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1443
1444         /* Check if we have GBIT capable MAC */
1445         tmp = GRETH_REGLOAD(regs->control);
1446         greth->gbit_mac = (tmp >> 27) & 1;
1447
1448         /* Check for multicast capability */
1449         greth->multicast = (tmp >> 25) & 1;
1450
1451         greth->edcl = (tmp >> 31) & 1;
1452
1453         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1454          * it doesn't interfere with the software */
1455         if (greth->edcl != 0)
1456                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1457
1458         /* Check if MAC can handle MDIO interrupts */
1459         greth->mdio_int_en = (tmp >> 26) & 1;
1460
1461         err = greth_mdio_init(greth);
1462         if (err) {
1463                 if (netif_msg_probe(greth))
1464                         dev_err(greth->dev, "failed to register MDIO bus\n");
1465                 goto error2;
1466         }
1467
1468         /* Allocate TX descriptor ring in coherent memory */
1469         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1470                                                                    1024,
1471                                                                    &greth->tx_bd_base_phys,
1472                                                                    GFP_KERNEL);
1473
1474         if (!greth->tx_bd_base) {
1475                 if (netif_msg_probe(greth))
1476                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1477                 err = -ENOMEM;
1478                 goto error3;
1479         }
1480
1481         memset(greth->tx_bd_base, 0, 1024);
1482
1483         /* Allocate RX descriptor ring in coherent memory */
1484         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1485                                                                    1024,
1486                                                                    &greth->rx_bd_base_phys,
1487                                                                    GFP_KERNEL);
1488
1489         if (!greth->rx_bd_base) {
1490                 if (netif_msg_probe(greth))
1491                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1492                 err = -ENOMEM;
1493                 goto error4;
1494         }
1495
1496         memset(greth->rx_bd_base, 0, 1024);
1497
1498         /* Get MAC address from: module param, OF property or ID prom */
1499         for (i = 0; i < 6; i++) {
1500                 if (macaddr[i] != 0)
1501                         break;
1502         }
1503         if (i == 6) {
1504                 const unsigned char *addr;
1505                 int len;
1506                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1507                                         &len);
1508                 if (addr != NULL && len == 6) {
1509                         for (i = 0; i < 6; i++)
1510                                 macaddr[i] = (unsigned int) addr[i];
1511                 } else {
1512 #ifdef CONFIG_SPARC
1513                         for (i = 0; i < 6; i++)
1514                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1515 #endif
1516                 }
1517         }
1518
1519         for (i = 0; i < 6; i++)
1520                 dev->dev_addr[i] = macaddr[i];
1521
1522         macaddr[5]++;
1523
1524         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1525                 if (netif_msg_probe(greth))
1526                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1527                 err = -EINVAL;
1528                 goto error5;
1529         }
1530
1531         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1532         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1533                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1534
1535         /* Clear all pending interrupts except PHY irq */
1536         GRETH_REGSAVE(regs->status, 0xFF);
1537
1538         if (greth->gbit_mac) {
1539                 dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA;
1540                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1541                 greth->flags = GRETH_FLAG_RX_CSUM;
1542         }
1543
1544         if (greth->multicast) {
1545                 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1546                 dev->flags |= IFF_MULTICAST;
1547         } else {
1548                 dev->flags &= ~IFF_MULTICAST;
1549         }
1550
1551         dev->netdev_ops = &greth_netdev_ops;
1552         dev->ethtool_ops = &greth_ethtool_ops;
1553
1554         err = register_netdev(dev);
1555         if (err) {
1556                 if (netif_msg_probe(greth))
1557                         dev_err(greth->dev, "netdevice registration failed.\n");
1558                 goto error5;
1559         }
1560
1561         /* setup NAPI */
1562         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1563
1564         return 0;
1565
1566 error5:
1567         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1568 error4:
1569         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1570 error3:
1571         mdiobus_unregister(greth->mdio);
1572 error2:
1573         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1574 error1:
1575         free_netdev(dev);
1576         return err;
1577 }
1578
1579 static int __devexit greth_of_remove(struct platform_device *of_dev)
1580 {
1581         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1582         struct greth_private *greth = netdev_priv(ndev);
1583
1584         /* Free descriptor areas */
1585         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1586
1587         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1588
1589         dev_set_drvdata(&of_dev->dev, NULL);
1590
1591         if (greth->phy)
1592                 phy_stop(greth->phy);
1593         mdiobus_unregister(greth->mdio);
1594
1595         unregister_netdev(ndev);
1596         free_netdev(ndev);
1597
1598         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1599
1600         return 0;
1601 }
1602
1603 static struct of_device_id greth_of_match[] = {
1604         {
1605          .name = "GAISLER_ETHMAC",
1606          },
1607         {
1608          .name = "01_01d",
1609          },
1610         {},
1611 };
1612
1613 MODULE_DEVICE_TABLE(of, greth_of_match);
1614
1615 static struct of_platform_driver greth_of_driver = {
1616         .driver = {
1617                 .name = "grlib-greth",
1618                 .owner = THIS_MODULE,
1619                 .of_match_table = greth_of_match,
1620         },
1621         .probe = greth_of_probe,
1622         .remove = __devexit_p(greth_of_remove),
1623 };
1624
1625 static int __init greth_init(void)
1626 {
1627         return of_register_platform_driver(&greth_of_driver);
1628 }
1629
1630 static void __exit greth_cleanup(void)
1631 {
1632         of_unregister_platform_driver(&greth_of_driver);
1633 }
1634
1635 module_init(greth_init);
1636 module_exit(greth_cleanup);
1637
1638 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1639 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1640 MODULE_LICENSE("GPL");