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