Pileus Git - ~andy/linux/blob - 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 | GRETH_BD_EN;
 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 descriptor chain by enabling the first descriptor */
 544         bdp = greth->tx_bd_base + greth->tx_next;
 545         greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 546         greth->tx_next = curr_tx;
 547         greth->tx_free -= nr_frags + 1;
 548
 549         wmb();
 550
 551         greth_enable_tx(greth);
 552
 553         return NETDEV_TX_OK;
 554
 555 frag_map_error:
 556         /* Unmap SKB mappings that succeeded and disable descriptor */
 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                 greth_write_bd(&bdp->stat, 0);
 564         }
 565 map_error:
 566         if (net_ratelimit())
 567                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 568         dev_kfree_skb(skb);
 569 out:
 570         return err;
 571 }
 572
 573
 574 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 575 {
 576         struct net_device *dev = dev_id;
 577         struct greth_private *greth;
 578         u32 status;
 579         irqreturn_t retval = IRQ_NONE;
 580
 581         greth = netdev_priv(dev);
 582
 583         spin_lock(&greth->devlock);
 584
 585         /* Get the interrupt events that caused us to be here. */
 586         status = GRETH_REGLOAD(greth->regs->status);
 587
 588         /* Handle rx and tx interrupts through poll */
 589         if (status & (GRETH_INT_RE | GRETH_INT_RX |
 590                       GRETH_INT_TE | GRETH_INT_TX)) {
 591
 592                 /* Clear interrupt status */
 593                 GRETH_REGSAVE(greth->regs->status,
 594                               status & (GRETH_INT_RE | GRETH_INT_RX |
 595                                         GRETH_INT_TE | GRETH_INT_TX));
 596                 retval = IRQ_HANDLED;
 597
 598                 /* Disable interrupts and schedule poll() */
 599                 greth_disable_irqs(greth);
 600                 napi_schedule(&greth->napi);
 601         }
 602
 603         mmiowb();
 604         spin_unlock(&greth->devlock);
 605
 606         return retval;
 607 }
 608
 609 static void greth_clean_tx(struct net_device *dev)
 610 {
 611         struct greth_private *greth;
 612         struct greth_bd *bdp;
 613         u32 stat;
 614
 615         greth = netdev_priv(dev);
 616
 617         while (1) {
 618                 bdp = greth->tx_bd_base + greth->tx_last;
 619                 stat = greth_read_bd(&bdp->stat);
 620
 621                 if (unlikely(stat & GRETH_BD_EN))
 622                         break;
 623
 624                 if (greth->tx_free == GRETH_TXBD_NUM)
 625                         break;
 626
 627                 /* Check status for errors */
 628                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 629                         dev->stats.tx_errors++;
 630                         if (stat & GRETH_TXBD_ERR_AL)
 631                                 dev->stats.tx_aborted_errors++;
 632                         if (stat & GRETH_TXBD_ERR_UE)
 633                                 dev->stats.tx_fifo_errors++;
 634                 }
 635                 dev->stats.tx_packets++;
 636                 greth->tx_last = NEXT_TX(greth->tx_last);
 637                 greth->tx_free++;
 638         }
 639
 640         if (greth->tx_free > 0) {
 641                 netif_wake_queue(dev);
 642         }
 643
 644 }
 645
 646 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 647 {
 648         /* Check status for errors */
 649         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 650                 dev->stats.tx_errors++;
 651                 if (stat & GRETH_TXBD_ERR_AL)
 652                         dev->stats.tx_aborted_errors++;
 653                 if (stat & GRETH_TXBD_ERR_UE)
 654                         dev->stats.tx_fifo_errors++;
 655                 if (stat & GRETH_TXBD_ERR_LC)
 656                         dev->stats.tx_aborted_errors++;
 657         }
 658         dev->stats.tx_packets++;
 659 }
 660
 661 static void greth_clean_tx_gbit(struct net_device *dev)
 662 {
 663         struct greth_private *greth;
 664         struct greth_bd *bdp, *bdp_last_frag;
 665         struct sk_buff *skb;
 666         u32 stat;
 667         int nr_frags, i;
 668
 669         greth = netdev_priv(dev);
 670
 671         while (greth->tx_free < GRETH_TXBD_NUM) {
 672
 673                 skb = greth->tx_skbuff[greth->tx_last];
 674
 675                 nr_frags = skb_shinfo(skb)->nr_frags;
 676
 677                 /* We only clean fully completed SKBs */
 678                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
 679                 stat = bdp_last_frag->stat;
 680
 681                 if (stat & GRETH_BD_EN)
 682                         break;
 683
 684                 greth->tx_skbuff[greth->tx_last] = NULL;
 685
 686                 greth_update_tx_stats(dev, stat);
 687
 688                 bdp = greth->tx_bd_base + greth->tx_last;
 689
 690                 greth->tx_last = NEXT_TX(greth->tx_last);
 691
 692                 dma_unmap_single(greth->dev,
 693                                  greth_read_bd(&bdp->addr),
 694                                  skb_headlen(skb),
 695                                  DMA_TO_DEVICE);
 696
 697                 for (i = 0; i < nr_frags; i++) {
 698                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 699                         bdp = greth->tx_bd_base + greth->tx_last;
 700
 701                         dma_unmap_page(greth->dev,
 702                                        greth_read_bd(&bdp->addr),
 703                                        frag->size,
 704                                        DMA_TO_DEVICE);
 705
 706                         greth->tx_last = NEXT_TX(greth->tx_last);
 707                 }
 708                 greth->tx_free += nr_frags+1;
 709                 dev_kfree_skb(skb);
 710         }
 711         if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
 712                 netif_wake_queue(dev);
 713         }
 714 }
 715
 716 static int greth_pending_packets(struct greth_private *greth)
 717 {
 718         struct greth_bd *bdp;
 719         u32 status;
 720         bdp = greth->rx_bd_base + greth->rx_cur;
 721         status = greth_read_bd(&bdp->stat);
 722         if (status & GRETH_BD_EN)
 723                 return 0;
 724         else
 725                 return 1;
 726 }
 727
 728 static int greth_rx(struct net_device *dev, int limit)
 729 {
 730         struct greth_private *greth;
 731         struct greth_bd *bdp;
 732         struct sk_buff *skb;
 733         int pkt_len;
 734         int bad, count;
 735         u32 status, dma_addr;
 736
 737         greth = netdev_priv(dev);
 738
 739         for (count = 0; count < limit; ++count) {
 740
 741                 bdp = greth->rx_bd_base + greth->rx_cur;
 742                 status = greth_read_bd(&bdp->stat);
 743                 dma_addr = greth_read_bd(&bdp->addr);
 744                 bad = 0;
 745
 746                 if (unlikely(status & GRETH_BD_EN)) {
 747                         break;
 748                 }
 749
 750                 /* Check status for errors. */
 751                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 752                         if (status & GRETH_RXBD_ERR_FT) {
 753                                 dev->stats.rx_length_errors++;
 754                                 bad = 1;
 755                         }
 756                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 757                                 dev->stats.rx_frame_errors++;
 758                                 bad = 1;
 759                         }
 760                         if (status & GRETH_RXBD_ERR_CRC) {
 761                                 dev->stats.rx_crc_errors++;
 762                                 bad = 1;
 763                         }
 764                 }
 765                 if (unlikely(bad)) {
 766                         dev->stats.rx_errors++;
 767
 768                 } else {
 769
 770                         pkt_len = status & GRETH_BD_LEN;
 771
 772                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 773
 774                         if (unlikely(skb == NULL)) {
 775
 776                                 if (net_ratelimit())
 777                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 778
 779                                 dev->stats.rx_dropped++;
 780
 781                         } else {
 782                                 skb_reserve(skb, NET_IP_ALIGN);
 783                                 skb->dev = dev;
 784
 785                                 dma_sync_single_for_cpu(greth->dev,
 786                                                         dma_addr,
 787                                                         pkt_len,
 788                                                         DMA_FROM_DEVICE);
 789
 790                                 if (netif_msg_pktdata(greth))
 791                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 792
 793                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
 794
 795                                 skb->protocol = eth_type_trans(skb, dev);
 796                                 dev->stats.rx_packets++;
 797                                 netif_receive_skb(skb);
 798                         }
 799                 }
 800
 801                 status = GRETH_BD_EN | GRETH_BD_IE;
 802                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 803                         status |= GRETH_BD_WR;
 804                 }
 805
 806                 wmb();
 807                 greth_write_bd(&bdp->stat, status);
 808
 809                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 810
 811                 greth_enable_rx(greth);
 812
 813                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 814         }
 815
 816         return count;
 817 }
 818
 819 static inline int hw_checksummed(u32 status)
 820 {
 821
 822         if (status & GRETH_RXBD_IP_FRAG)
 823                 return 0;
 824
 825         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 826                 return 0;
 827
 828         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 829                 return 0;
 830
 831         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 832                 return 0;
 833
 834         return 1;
 835 }
 836
 837 static int greth_rx_gbit(struct net_device *dev, int limit)
 838 {
 839         struct greth_private *greth;
 840         struct greth_bd *bdp;
 841         struct sk_buff *skb, *newskb;
 842         int pkt_len;
 843         int bad, count = 0;
 844         u32 status, dma_addr;
 845
 846         greth = netdev_priv(dev);
 847
 848         for (count = 0; count < limit; ++count) {
 849
 850                 bdp = greth->rx_bd_base + greth->rx_cur;
 851                 skb = greth->rx_skbuff[greth->rx_cur];
 852                 status = greth_read_bd(&bdp->stat);
 853                 bad = 0;
 854
 855                 if (status & GRETH_BD_EN)
 856                         break;
 857
 858                 /* Check status for errors. */
 859                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 860
 861                         if (status & GRETH_RXBD_ERR_FT) {
 862                                 dev->stats.rx_length_errors++;
 863                                 bad = 1;
 864                         } else if (status &
 865                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 866                                 dev->stats.rx_frame_errors++;
 867                                 bad = 1;
 868                         } else if (status & GRETH_RXBD_ERR_CRC) {
 869                                 dev->stats.rx_crc_errors++;
 870                                 bad = 1;
 871                         }
 872                 }
 873
 874                 /* Allocate new skb to replace current, not needed if the
 875                  * current skb can be reused */
 876                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 877                         skb_reserve(newskb, NET_IP_ALIGN);
 878
 879                         dma_addr = dma_map_single(greth->dev,
 880                                                       newskb->data,
 881                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 882                                                       DMA_FROM_DEVICE);
 883
 884                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 885                                 /* Process the incoming frame. */
 886                                 pkt_len = status & GRETH_BD_LEN;
 887
 888                                 dma_unmap_single(greth->dev,
 889                                                  greth_read_bd(&bdp->addr),
 890                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 891                                                  DMA_FROM_DEVICE);
 892
 893                                 if (netif_msg_pktdata(greth))
 894                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 895
 896                                 skb_put(skb, pkt_len);
 897
 898                                 if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
 899                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 900                                 else
 901                                         skb_checksum_none_assert(skb);
 902
 903                                 skb->protocol = eth_type_trans(skb, dev);
 904                                 dev->stats.rx_packets++;
 905                                 netif_receive_skb(skb);
 906
 907                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 908                                 greth_write_bd(&bdp->addr, dma_addr);
 909                         } else {
 910                                 if (net_ratelimit())
 911                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 912                                 dev_kfree_skb(newskb);
 913                                 /* reusing current skb, so it is a drop */
 914                                 dev->stats.rx_dropped++;
 915                         }
 916                 } else if (bad) {
 917                         /* Bad Frame transfer, the skb is reused */
 918                         dev->stats.rx_dropped++;
 919                 } else {
 920                         /* Failed Allocating a new skb. This is rather stupid
 921                          * but the current "filled" skb is reused, as if
 922                          * transfer failure. One could argue that RX descriptor
 923                          * table handling should be divided into cleaning and
 924                          * filling as the TX part of the driver
 925                          */
 926                         if (net_ratelimit())
 927                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 928                         /* reusing current skb, so it is a drop */
 929                         dev->stats.rx_dropped++;
 930                 }
 931
 932                 status = GRETH_BD_EN | GRETH_BD_IE;
 933                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 934                         status |= GRETH_BD_WR;
 935                 }
 936
 937                 wmb();
 938                 greth_write_bd(&bdp->stat, status);
 939                 greth_enable_rx(greth);
 940                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 941         }
 942
 943         return count;
 944
 945 }
 946
 947 static int greth_poll(struct napi_struct *napi, int budget)
 948 {
 949         struct greth_private *greth;
 950         int work_done = 0;
 951         greth = container_of(napi, struct greth_private, napi);
 952
 953         if (greth->gbit_mac) {
 954                 greth_clean_tx_gbit(greth->netdev);
 955         } else {
 956                 greth_clean_tx(greth->netdev);
 957         }
 958
 959 restart_poll:
 960         if (greth->gbit_mac) {
 961                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 962         } else {
 963                 work_done += greth_rx(greth->netdev, budget - work_done);
 964         }
 965
 966         if (work_done < budget) {
 967
 968                 napi_complete(napi);
 969
 970                 if (greth_pending_packets(greth)) {
 971                         napi_reschedule(napi);
 972                         goto restart_poll;
 973                 }
 974         }
 975
 976         greth_enable_irqs(greth);
 977         return work_done;
 978 }
 979
 980 static int greth_set_mac_add(struct net_device *dev, void *p)
 981 {
 982         struct sockaddr *addr = p;
 983         struct greth_private *greth;
 984         struct greth_regs *regs;
 985
 986         greth = netdev_priv(dev);
 987         regs = (struct greth_regs *) greth->regs;
 988
 989         if (!is_valid_ether_addr(addr->sa_data))
 990                 return -EINVAL;
 991
 992         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 993
 994         GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
 995         GRETH_REGSAVE(regs->esa_lsb,
 996                       addr->sa_data[2] << 24 | addr->
 997                       sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
 998         return 0;
 999 }
1000
1001 static u32 greth_hash_get_index(__u8 *addr)
1002 {
1003         return (ether_crc(6, addr)) & 0x3F;
1004 }
1005
1006 static void greth_set_hash_filter(struct net_device *dev)
1007 {
1008         struct netdev_hw_addr *ha;
1009         struct greth_private *greth = netdev_priv(dev);
1010         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1011         u32 mc_filter[2];
1012         unsigned int bitnr;
1013
1014         mc_filter[0] = mc_filter[1] = 0;
1015
1016         netdev_for_each_mc_addr(ha, dev) {
1017                 bitnr = greth_hash_get_index(ha->addr);
1018                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1019         }
1020
1021         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1022         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1023 }
1024
1025 static void greth_set_multicast_list(struct net_device *dev)
1026 {
1027         int cfg;
1028         struct greth_private *greth = netdev_priv(dev);
1029         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1030
1031         cfg = GRETH_REGLOAD(regs->control);
1032         if (dev->flags & IFF_PROMISC)
1033                 cfg |= GRETH_CTRL_PR;
1034         else
1035                 cfg &= ~GRETH_CTRL_PR;
1036
1037         if (greth->multicast) {
1038                 if (dev->flags & IFF_ALLMULTI) {
1039                         GRETH_REGSAVE(regs->hash_msb, -1);
1040                         GRETH_REGSAVE(regs->hash_lsb, -1);
1041                         cfg |= GRETH_CTRL_MCEN;
1042                         GRETH_REGSAVE(regs->control, cfg);
1043                         return;
1044                 }
1045
1046                 if (netdev_mc_empty(dev)) {
1047                         cfg &= ~GRETH_CTRL_MCEN;
1048                         GRETH_REGSAVE(regs->control, cfg);
1049                         return;
1050                 }
1051
1052                 /* Setup multicast filter */
1053                 greth_set_hash_filter(dev);
1054                 cfg |= GRETH_CTRL_MCEN;
1055         }
1056         GRETH_REGSAVE(regs->control, cfg);
1057 }
1058
1059 static u32 greth_get_msglevel(struct net_device *dev)
1060 {
1061         struct greth_private *greth = netdev_priv(dev);
1062         return greth->msg_enable;
1063 }
1064
1065 static void greth_set_msglevel(struct net_device *dev, u32 value)
1066 {
1067         struct greth_private *greth = netdev_priv(dev);
1068         greth->msg_enable = value;
1069 }
1070 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1071 {
1072         struct greth_private *greth = netdev_priv(dev);
1073         struct phy_device *phy = greth->phy;
1074
1075         if (!phy)
1076                 return -ENODEV;
1077
1078         return phy_ethtool_gset(phy, cmd);
1079 }
1080
1081 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1082 {
1083         struct greth_private *greth = netdev_priv(dev);
1084         struct phy_device *phy = greth->phy;
1085
1086         if (!phy)
1087                 return -ENODEV;
1088
1089         return phy_ethtool_sset(phy, cmd);
1090 }
1091
1092 static int greth_get_regs_len(struct net_device *dev)
1093 {
1094         return sizeof(struct greth_regs);
1095 }
1096
1097 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1098 {
1099         struct greth_private *greth = netdev_priv(dev);
1100
1101         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1102         strncpy(info->version, "revision: 1.0", 32);
1103         strncpy(info->bus_info, greth->dev->bus->name, 32);
1104         strncpy(info->fw_version, "N/A", 32);
1105         info->eedump_len = 0;
1106         info->regdump_len = sizeof(struct greth_regs);
1107 }
1108
1109 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1110 {
1111         int i;
1112         struct greth_private *greth = netdev_priv(dev);
1113         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1114         u32 *buff = p;
1115
1116         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1117                 buff[i] = greth_read_bd(&greth_regs[i]);
1118 }
1119
1120 static u32 greth_get_rx_csum(struct net_device *dev)
1121 {
1122         struct greth_private *greth = netdev_priv(dev);
1123         return (greth->flags & GRETH_FLAG_RX_CSUM) != 0;
1124 }
1125
1126 static int greth_set_rx_csum(struct net_device *dev, u32 data)
1127 {
1128         struct greth_private *greth = netdev_priv(dev);
1129
1130         spin_lock_bh(&greth->devlock);
1131
1132         if (data)
1133                 greth->flags |= GRETH_FLAG_RX_CSUM;
1134         else
1135                 greth->flags &= ~GRETH_FLAG_RX_CSUM;
1136
1137         spin_unlock_bh(&greth->devlock);
1138
1139         return 0;
1140 }
1141
1142 static u32 greth_get_tx_csum(struct net_device *dev)
1143 {
1144         return (dev->features & NETIF_F_IP_CSUM) != 0;
1145 }
1146
1147 static int greth_set_tx_csum(struct net_device *dev, u32 data)
1148 {
1149         netif_tx_lock_bh(dev);
1150         ethtool_op_set_tx_csum(dev, data);
1151         netif_tx_unlock_bh(dev);
1152         return 0;
1153 }
1154
1155 static const struct ethtool_ops greth_ethtool_ops = {
1156         .get_msglevel           = greth_get_msglevel,
1157         .set_msglevel           = greth_set_msglevel,
1158         .get_settings           = greth_get_settings,
1159         .set_settings           = greth_set_settings,
1160         .get_drvinfo            = greth_get_drvinfo,
1161         .get_regs_len           = greth_get_regs_len,
1162         .get_regs               = greth_get_regs,
1163         .get_rx_csum            = greth_get_rx_csum,
1164         .set_rx_csum            = greth_set_rx_csum,
1165         .get_tx_csum            = greth_get_tx_csum,
1166         .set_tx_csum            = greth_set_tx_csum,
1167         .get_link               = ethtool_op_get_link,
1168 };
1169
1170 static struct net_device_ops greth_netdev_ops = {
1171         .ndo_open = greth_open,
1172         .ndo_stop = greth_close,
1173         .ndo_start_xmit = greth_start_xmit,
1174         .ndo_set_mac_address = greth_set_mac_add,
1175         .ndo_validate_addr      = eth_validate_addr,
1176 };
1177
1178 static inline int wait_for_mdio(struct greth_private *greth)
1179 {
1180         unsigned long timeout = jiffies + 4*HZ/100;
1181         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1182                 if (time_after(jiffies, timeout))
1183                         return 0;
1184         }
1185         return 1;
1186 }
1187
1188 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1189 {
1190         struct greth_private *greth = bus->priv;
1191         int data;
1192
1193         if (!wait_for_mdio(greth))
1194                 return -EBUSY;
1195
1196         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1197
1198         if (!wait_for_mdio(greth))
1199                 return -EBUSY;
1200
1201         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1202                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1203                 return data;
1204
1205         } else {
1206                 return -1;
1207         }
1208 }
1209
1210 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1211 {
1212         struct greth_private *greth = bus->priv;
1213
1214         if (!wait_for_mdio(greth))
1215                 return -EBUSY;
1216
1217         GRETH_REGSAVE(greth->regs->mdio,
1218                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1219
1220         if (!wait_for_mdio(greth))
1221                 return -EBUSY;
1222
1223         return 0;
1224 }
1225
1226 static int greth_mdio_reset(struct mii_bus *bus)
1227 {
1228         return 0;
1229 }
1230
1231 static void greth_link_change(struct net_device *dev)
1232 {
1233         struct greth_private *greth = netdev_priv(dev);
1234         struct phy_device *phydev = greth->phy;
1235         unsigned long flags;
1236         int status_change = 0;
1237         u32 ctrl;
1238
1239         spin_lock_irqsave(&greth->devlock, flags);
1240
1241         if (phydev->link) {
1242
1243                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1244                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1245                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1246
1247                         if (phydev->duplex)
1248                                 ctrl |= GRETH_CTRL_FD;
1249
1250                         if (phydev->speed == SPEED_100)
1251                                 ctrl |= GRETH_CTRL_SP;
1252                         else if (phydev->speed == SPEED_1000)
1253                                 ctrl |= GRETH_CTRL_GB;
1254
1255                         GRETH_REGSAVE(greth->regs->control, ctrl);
1256                         greth->speed = phydev->speed;
1257                         greth->duplex = phydev->duplex;
1258                         status_change = 1;
1259                 }
1260         }
1261
1262         if (phydev->link != greth->link) {
1263                 if (!phydev->link) {
1264                         greth->speed = 0;
1265                         greth->duplex = -1;
1266                 }
1267                 greth->link = phydev->link;
1268
1269                 status_change = 1;
1270         }
1271
1272         spin_unlock_irqrestore(&greth->devlock, flags);
1273
1274         if (status_change) {
1275                 if (phydev->link)
1276                         pr_debug("%s: link up (%d/%s)\n",
1277                                 dev->name, phydev->speed,
1278                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1279                 else
1280                         pr_debug("%s: link down\n", dev->name);
1281         }
1282 }
1283
1284 static int greth_mdio_probe(struct net_device *dev)
1285 {
1286         struct greth_private *greth = netdev_priv(dev);
1287         struct phy_device *phy = NULL;
1288         int ret;
1289
1290         /* Find the first PHY */
1291         phy = phy_find_first(greth->mdio);
1292
1293         if (!phy) {
1294                 if (netif_msg_probe(greth))
1295                         dev_err(&dev->dev, "no PHY found\n");
1296                 return -ENXIO;
1297         }
1298
1299         ret = phy_connect_direct(dev, phy, &greth_link_change,
1300                         0, greth->gbit_mac ?
1301                         PHY_INTERFACE_MODE_GMII :
1302                         PHY_INTERFACE_MODE_MII);
1303         if (ret) {
1304                 if (netif_msg_ifup(greth))
1305                         dev_err(&dev->dev, "could not attach to PHY\n");
1306                 return ret;
1307         }
1308
1309         if (greth->gbit_mac)
1310                 phy->supported &= PHY_GBIT_FEATURES;
1311         else
1312                 phy->supported &= PHY_BASIC_FEATURES;
1313
1314         phy->advertising = phy->supported;
1315
1316         greth->link = 0;
1317         greth->speed = 0;
1318         greth->duplex = -1;
1319         greth->phy = phy;
1320
1321         return 0;
1322 }
1323
1324 static inline int phy_aneg_done(struct phy_device *phydev)
1325 {
1326         int retval;
1327
1328         retval = phy_read(phydev, MII_BMSR);
1329
1330         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1331 }
1332
1333 static int greth_mdio_init(struct greth_private *greth)
1334 {
1335         int ret, phy;
1336         unsigned long timeout;
1337
1338         greth->mdio = mdiobus_alloc();
1339         if (!greth->mdio) {
1340                 return -ENOMEM;
1341         }
1342
1343         greth->mdio->name = "greth-mdio";
1344         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1345         greth->mdio->read = greth_mdio_read;
1346         greth->mdio->write = greth_mdio_write;
1347         greth->mdio->reset = greth_mdio_reset;
1348         greth->mdio->priv = greth;
1349
1350         greth->mdio->irq = greth->mdio_irqs;
1351
1352         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1353                 greth->mdio->irq[phy] = PHY_POLL;
1354
1355         ret = mdiobus_register(greth->mdio);
1356         if (ret) {
1357                 goto error;
1358         }
1359
1360         ret = greth_mdio_probe(greth->netdev);
1361         if (ret) {
1362                 if (netif_msg_probe(greth))
1363                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1364                 goto unreg_mdio;
1365         }
1366
1367         phy_start(greth->phy);
1368
1369         /* If Ethernet debug link is used make autoneg happen right away */
1370         if (greth->edcl && greth_edcl == 1) {
1371                 phy_start_aneg(greth->phy);
1372                 timeout = jiffies + 6*HZ;
1373                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1374                 }
1375                 genphy_read_status(greth->phy);
1376                 greth_link_change(greth->netdev);
1377         }
1378
1379         return 0;
1380
1381 unreg_mdio:
1382         mdiobus_unregister(greth->mdio);
1383 error:
1384         mdiobus_free(greth->mdio);
1385         return ret;
1386 }
1387
1388 /* Initialize the GRETH MAC */
1389 static int __devinit greth_of_probe(struct platform_device *ofdev, const struct of_device_id *match)
1390 {
1391         struct net_device *dev;
1392         struct greth_private *greth;
1393         struct greth_regs *regs;
1394
1395         int i;
1396         int err;
1397         int tmp;
1398         unsigned long timeout;
1399
1400         dev = alloc_etherdev(sizeof(struct greth_private));
1401
1402         if (dev == NULL)
1403                 return -ENOMEM;
1404
1405         greth = netdev_priv(dev);
1406         greth->netdev = dev;
1407         greth->dev = &ofdev->dev;
1408
1409         if (greth_debug > 0)
1410                 greth->msg_enable = greth_debug;
1411         else
1412                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1413
1414         spin_lock_init(&greth->devlock);
1415
1416         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1417                                  resource_size(&ofdev->resource[0]),
1418                                  "grlib-greth regs");
1419
1420         if (greth->regs == NULL) {
1421                 if (netif_msg_probe(greth))
1422                         dev_err(greth->dev, "ioremap failure.\n");
1423                 err = -EIO;
1424                 goto error1;
1425         }
1426
1427         regs = (struct greth_regs *) greth->regs;
1428         greth->irq = ofdev->archdata.irqs[0];
1429
1430         dev_set_drvdata(greth->dev, dev);
1431         SET_NETDEV_DEV(dev, greth->dev);
1432
1433         if (netif_msg_probe(greth))
1434                 dev_dbg(greth->dev, "reseting controller.\n");
1435
1436         /* Reset the controller. */
1437         GRETH_REGSAVE(regs->control, GRETH_RESET);
1438
1439         /* Wait for MAC to reset itself */
1440         timeout = jiffies + HZ/100;
1441         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1442                 if (time_after(jiffies, timeout)) {
1443                         err = -EIO;
1444                         if (netif_msg_probe(greth))
1445                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1446                         goto error2;
1447                 }
1448         }
1449
1450         /* Get default PHY address  */
1451         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1452
1453         /* Check if we have GBIT capable MAC */
1454         tmp = GRETH_REGLOAD(regs->control);
1455         greth->gbit_mac = (tmp >> 27) & 1;
1456
1457         /* Check for multicast capability */
1458         greth->multicast = (tmp >> 25) & 1;
1459
1460         greth->edcl = (tmp >> 31) & 1;
1461
1462         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1463          * it doesn't interfere with the software */
1464         if (greth->edcl != 0)
1465                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1466
1467         /* Check if MAC can handle MDIO interrupts */
1468         greth->mdio_int_en = (tmp >> 26) & 1;
1469
1470         err = greth_mdio_init(greth);
1471         if (err) {
1472                 if (netif_msg_probe(greth))
1473                         dev_err(greth->dev, "failed to register MDIO bus\n");
1474                 goto error2;
1475         }
1476
1477         /* Allocate TX descriptor ring in coherent memory */
1478         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1479                                                                    1024,
1480                                                                    &greth->tx_bd_base_phys,
1481                                                                    GFP_KERNEL);
1482
1483         if (!greth->tx_bd_base) {
1484                 if (netif_msg_probe(greth))
1485                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1486                 err = -ENOMEM;
1487                 goto error3;
1488         }
1489
1490         memset(greth->tx_bd_base, 0, 1024);
1491
1492         /* Allocate RX descriptor ring in coherent memory */
1493         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1494                                                                    1024,
1495                                                                    &greth->rx_bd_base_phys,
1496                                                                    GFP_KERNEL);
1497
1498         if (!greth->rx_bd_base) {
1499                 if (netif_msg_probe(greth))
1500                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1501                 err = -ENOMEM;
1502                 goto error4;
1503         }
1504
1505         memset(greth->rx_bd_base, 0, 1024);
1506
1507         /* Get MAC address from: module param, OF property or ID prom */
1508         for (i = 0; i < 6; i++) {
1509                 if (macaddr[i] != 0)
1510                         break;
1511         }
1512         if (i == 6) {
1513                 const unsigned char *addr;
1514                 int len;
1515                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1516                                         &len);
1517                 if (addr != NULL && len == 6) {
1518                         for (i = 0; i < 6; i++)
1519                                 macaddr[i] = (unsigned int) addr[i];
1520                 } else {
1521 #ifdef CONFIG_SPARC
1522                         for (i = 0; i < 6; i++)
1523                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1524 #endif
1525                 }
1526         }
1527
1528         for (i = 0; i < 6; i++)
1529                 dev->dev_addr[i] = macaddr[i];
1530
1531         macaddr[5]++;
1532
1533         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1534                 if (netif_msg_probe(greth))
1535                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1536                 err = -EINVAL;
1537                 goto error5;
1538         }
1539
1540         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1541         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1542                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1543
1544         /* Clear all pending interrupts except PHY irq */
1545         GRETH_REGSAVE(regs->status, 0xFF);
1546
1547         if (greth->gbit_mac) {
1548                 dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA;
1549                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1550                 greth->flags = GRETH_FLAG_RX_CSUM;
1551         }
1552
1553         if (greth->multicast) {
1554                 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1555                 dev->flags |= IFF_MULTICAST;
1556         } else {
1557                 dev->flags &= ~IFF_MULTICAST;
1558         }
1559
1560         dev->netdev_ops = &greth_netdev_ops;
1561         dev->ethtool_ops = &greth_ethtool_ops;
1562
1563         err = register_netdev(dev);
1564         if (err) {
1565                 if (netif_msg_probe(greth))
1566                         dev_err(greth->dev, "netdevice registration failed.\n");
1567                 goto error5;
1568         }
1569
1570         /* setup NAPI */
1571         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1572
1573         return 0;
1574
1575 error5:
1576         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1577 error4:
1578         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1579 error3:
1580         mdiobus_unregister(greth->mdio);
1581 error2:
1582         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1583 error1:
1584         free_netdev(dev);
1585         return err;
1586 }
1587
1588 static int __devexit greth_of_remove(struct platform_device *of_dev)
1589 {
1590         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1591         struct greth_private *greth = netdev_priv(ndev);
1592
1593         /* Free descriptor areas */
1594         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1595
1596         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1597
1598         dev_set_drvdata(&of_dev->dev, NULL);
1599
1600         if (greth->phy)
1601                 phy_stop(greth->phy);
1602         mdiobus_unregister(greth->mdio);
1603
1604         unregister_netdev(ndev);
1605         free_netdev(ndev);
1606
1607         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1608
1609         return 0;
1610 }
1611
1612 static struct of_device_id greth_of_match[] = {
1613         {
1614          .name = "GAISLER_ETHMAC",
1615          },
1616         {
1617          .name = "01_01d",
1618          },
1619         {},
1620 };
1621
1622 MODULE_DEVICE_TABLE(of, greth_of_match);
1623
1624 static struct of_platform_driver greth_of_driver = {
1625         .driver = {
1626                 .name = "grlib-greth",
1627                 .owner = THIS_MODULE,
1628                 .of_match_table = greth_of_match,
1629         },
1630         .probe = greth_of_probe,
1631         .remove = __devexit_p(greth_of_remove),
1632 };
1633
1634 static int __init greth_init(void)
1635 {
1636         return of_register_platform_driver(&greth_of_driver);
1637 }
1638
1639 static void __exit greth_cleanup(void)
1640 {
1641         of_unregister_platform_driver(&greth_of_driver);
1642 }
1643
1644 module_init(greth_init);
1645 module_exit(greth_cleanup);
1646
1647 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1648 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1649 MODULE_LICENSE("GPL");