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_RX | GRETH_INT_TX)) {
 590
 591                 /* Clear interrupt status */
 592                 GRETH_REGORIN(greth->regs->status,
 593                               status & (GRETH_INT_RX | GRETH_INT_TX));
 594
 595                 retval = IRQ_HANDLED;
 596
 597                 /* Disable interrupts and schedule poll() */
 598                 greth_disable_irqs(greth);
 599                 napi_schedule(&greth->napi);
 600         }
 601
 602         mmiowb();
 603         spin_unlock(&greth->devlock);
 604
 605         return retval;
 606 }
 607
 608 static void greth_clean_tx(struct net_device *dev)
 609 {
 610         struct greth_private *greth;
 611         struct greth_bd *bdp;
 612         u32 stat;
 613
 614         greth = netdev_priv(dev);
 615
 616         while (1) {
 617                 bdp = greth->tx_bd_base + greth->tx_last;
 618                 stat = greth_read_bd(&bdp->stat);
 619
 620                 if (unlikely(stat & GRETH_BD_EN))
 621                         break;
 622
 623                 if (greth->tx_free == GRETH_TXBD_NUM)
 624                         break;
 625
 626                 /* Check status for errors */
 627                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 628                         dev->stats.tx_errors++;
 629                         if (stat & GRETH_TXBD_ERR_AL)
 630                                 dev->stats.tx_aborted_errors++;
 631                         if (stat & GRETH_TXBD_ERR_UE)
 632                                 dev->stats.tx_fifo_errors++;
 633                 }
 634                 dev->stats.tx_packets++;
 635                 greth->tx_last = NEXT_TX(greth->tx_last);
 636                 greth->tx_free++;
 637         }
 638
 639         if (greth->tx_free > 0) {
 640                 netif_wake_queue(dev);
 641         }
 642
 643 }
 644
 645 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 646 {
 647         /* Check status for errors */
 648         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 649                 dev->stats.tx_errors++;
 650                 if (stat & GRETH_TXBD_ERR_AL)
 651                         dev->stats.tx_aborted_errors++;
 652                 if (stat & GRETH_TXBD_ERR_UE)
 653                         dev->stats.tx_fifo_errors++;
 654                 if (stat & GRETH_TXBD_ERR_LC)
 655                         dev->stats.tx_aborted_errors++;
 656         }
 657         dev->stats.tx_packets++;
 658 }
 659
 660 static void greth_clean_tx_gbit(struct net_device *dev)
 661 {
 662         struct greth_private *greth;
 663         struct greth_bd *bdp, *bdp_last_frag;
 664         struct sk_buff *skb;
 665         u32 stat;
 666         int nr_frags, i;
 667
 668         greth = netdev_priv(dev);
 669
 670         while (greth->tx_free < GRETH_TXBD_NUM) {
 671
 672                 skb = greth->tx_skbuff[greth->tx_last];
 673
 674                 nr_frags = skb_shinfo(skb)->nr_frags;
 675
 676                 /* We only clean fully completed SKBs */
 677                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
 678                 stat = bdp_last_frag->stat;
 679
 680                 if (stat & GRETH_BD_EN)
 681                         break;
 682
 683                 greth->tx_skbuff[greth->tx_last] = NULL;
 684
 685                 greth_update_tx_stats(dev, stat);
 686
 687                 bdp = greth->tx_bd_base + greth->tx_last;
 688
 689                 greth->tx_last = NEXT_TX(greth->tx_last);
 690
 691                 dma_unmap_single(greth->dev,
 692                                  greth_read_bd(&bdp->addr),
 693                                  skb_headlen(skb),
 694                                  DMA_TO_DEVICE);
 695
 696                 for (i = 0; i < nr_frags; i++) {
 697                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 698                         bdp = greth->tx_bd_base + greth->tx_last;
 699
 700                         dma_unmap_page(greth->dev,
 701                                        greth_read_bd(&bdp->addr),
 702                                        frag->size,
 703                                        DMA_TO_DEVICE);
 704
 705                         greth->tx_last = NEXT_TX(greth->tx_last);
 706                 }
 707                 greth->tx_free += nr_frags+1;
 708                 dev_kfree_skb(skb);
 709         }
 710         if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
 711                 netif_wake_queue(dev);
 712         }
 713 }
 714
 715 static int greth_pending_packets(struct greth_private *greth)
 716 {
 717         struct greth_bd *bdp;
 718         u32 status;
 719         bdp = greth->rx_bd_base + greth->rx_cur;
 720         status = greth_read_bd(&bdp->stat);
 721         if (status & GRETH_BD_EN)
 722                 return 0;
 723         else
 724                 return 1;
 725 }
 726
 727 static int greth_rx(struct net_device *dev, int limit)
 728 {
 729         struct greth_private *greth;
 730         struct greth_bd *bdp;
 731         struct sk_buff *skb;
 732         int pkt_len;
 733         int bad, count;
 734         u32 status, dma_addr;
 735
 736         greth = netdev_priv(dev);
 737
 738         for (count = 0; count < limit; ++count) {
 739
 740                 bdp = greth->rx_bd_base + greth->rx_cur;
 741                 status = greth_read_bd(&bdp->stat);
 742                 dma_addr = greth_read_bd(&bdp->addr);
 743                 bad = 0;
 744
 745                 if (unlikely(status & GRETH_BD_EN)) {
 746                         break;
 747                 }
 748
 749                 /* Check status for errors. */
 750                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 751                         if (status & GRETH_RXBD_ERR_FT) {
 752                                 dev->stats.rx_length_errors++;
 753                                 bad = 1;
 754                         }
 755                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 756                                 dev->stats.rx_frame_errors++;
 757                                 bad = 1;
 758                         }
 759                         if (status & GRETH_RXBD_ERR_CRC) {
 760                                 dev->stats.rx_crc_errors++;
 761                                 bad = 1;
 762                         }
 763                 }
 764                 if (unlikely(bad)) {
 765                         dev->stats.rx_errors++;
 766
 767                 } else {
 768
 769                         pkt_len = status & GRETH_BD_LEN;
 770
 771                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 772
 773                         if (unlikely(skb == NULL)) {
 774
 775                                 if (net_ratelimit())
 776                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 777
 778                                 dev->stats.rx_dropped++;
 779
 780                         } else {
 781                                 skb_reserve(skb, NET_IP_ALIGN);
 782                                 skb->dev = dev;
 783
 784                                 dma_sync_single_for_cpu(greth->dev,
 785                                                         dma_addr,
 786                                                         pkt_len,
 787                                                         DMA_FROM_DEVICE);
 788
 789                                 if (netif_msg_pktdata(greth))
 790                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 791
 792                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
 793
 794                                 skb->protocol = eth_type_trans(skb, dev);
 795                                 dev->stats.rx_packets++;
 796                                 netif_receive_skb(skb);
 797                         }
 798                 }
 799
 800                 status = GRETH_BD_EN | GRETH_BD_IE;
 801                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 802                         status |= GRETH_BD_WR;
 803                 }
 804
 805                 wmb();
 806                 greth_write_bd(&bdp->stat, status);
 807
 808                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 809
 810                 greth_enable_rx(greth);
 811
 812                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 813         }
 814
 815         return count;
 816 }
 817
 818 static inline int hw_checksummed(u32 status)
 819 {
 820
 821         if (status & GRETH_RXBD_IP_FRAG)
 822                 return 0;
 823
 824         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 825                 return 0;
 826
 827         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 828                 return 0;
 829
 830         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 831                 return 0;
 832
 833         return 1;
 834 }
 835
 836 static int greth_rx_gbit(struct net_device *dev, int limit)
 837 {
 838         struct greth_private *greth;
 839         struct greth_bd *bdp;
 840         struct sk_buff *skb, *newskb;
 841         int pkt_len;
 842         int bad, count = 0;
 843         u32 status, dma_addr;
 844
 845         greth = netdev_priv(dev);
 846
 847         for (count = 0; count < limit; ++count) {
 848
 849                 bdp = greth->rx_bd_base + greth->rx_cur;
 850                 skb = greth->rx_skbuff[greth->rx_cur];
 851                 status = greth_read_bd(&bdp->stat);
 852                 bad = 0;
 853
 854                 if (status & GRETH_BD_EN)
 855                         break;
 856
 857                 /* Check status for errors. */
 858                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 859
 860                         if (status & GRETH_RXBD_ERR_FT) {
 861                                 dev->stats.rx_length_errors++;
 862                                 bad = 1;
 863                         } else if (status &
 864                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 865                                 dev->stats.rx_frame_errors++;
 866                                 bad = 1;
 867                         } else if (status & GRETH_RXBD_ERR_CRC) {
 868                                 dev->stats.rx_crc_errors++;
 869                                 bad = 1;
 870                         }
 871                 }
 872
 873                 /* Allocate new skb to replace current, not needed if the
 874                  * current skb can be reused */
 875                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 876                         skb_reserve(newskb, NET_IP_ALIGN);
 877
 878                         dma_addr = dma_map_single(greth->dev,
 879                                                       newskb->data,
 880                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 881                                                       DMA_FROM_DEVICE);
 882
 883                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 884                                 /* Process the incoming frame. */
 885                                 pkt_len = status & GRETH_BD_LEN;
 886
 887                                 dma_unmap_single(greth->dev,
 888                                                  greth_read_bd(&bdp->addr),
 889                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 890                                                  DMA_FROM_DEVICE);
 891
 892                                 if (netif_msg_pktdata(greth))
 893                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 894
 895                                 skb_put(skb, pkt_len);
 896
 897                                 if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
 898                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 899                                 else
 900                                         skb_checksum_none_assert(skb);
 901
 902                                 skb->protocol = eth_type_trans(skb, dev);
 903                                 dev->stats.rx_packets++;
 904                                 netif_receive_skb(skb);
 905
 906                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 907                                 greth_write_bd(&bdp->addr, dma_addr);
 908                         } else {
 909                                 if (net_ratelimit())
 910                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 911                                 dev_kfree_skb(newskb);
 912                                 /* reusing current skb, so it is a drop */
 913                                 dev->stats.rx_dropped++;
 914                         }
 915                 } else if (bad) {
 916                         /* Bad Frame transfer, the skb is reused */
 917                         dev->stats.rx_dropped++;
 918                 } else {
 919                         /* Failed Allocating a new skb. This is rather stupid
 920                          * but the current "filled" skb is reused, as if
 921                          * transfer failure. One could argue that RX descriptor
 922                          * table handling should be divided into cleaning and
 923                          * filling as the TX part of the driver
 924                          */
 925                         if (net_ratelimit())
 926                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 927                         /* reusing current skb, so it is a drop */
 928                         dev->stats.rx_dropped++;
 929                 }
 930
 931                 status = GRETH_BD_EN | GRETH_BD_IE;
 932                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 933                         status |= GRETH_BD_WR;
 934                 }
 935
 936                 wmb();
 937                 greth_write_bd(&bdp->stat, status);
 938                 greth_enable_rx(greth);
 939                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 940         }
 941
 942         return count;
 943
 944 }
 945
 946 static int greth_poll(struct napi_struct *napi, int budget)
 947 {
 948         struct greth_private *greth;
 949         int work_done = 0;
 950         greth = container_of(napi, struct greth_private, napi);
 951
 952         if (greth->gbit_mac) {
 953                 greth_clean_tx_gbit(greth->netdev);
 954         } else {
 955                 greth_clean_tx(greth->netdev);
 956         }
 957
 958 restart_poll:
 959         if (greth->gbit_mac) {
 960                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 961         } else {
 962                 work_done += greth_rx(greth->netdev, budget - work_done);
 963         }
 964
 965         if (work_done < budget) {
 966
 967                 napi_complete(napi);
 968
 969                 if (greth_pending_packets(greth)) {
 970                         napi_reschedule(napi);
 971                         goto restart_poll;
 972                 }
 973         }
 974
 975         greth_enable_irqs(greth);
 976         return work_done;
 977 }
 978
 979 static int greth_set_mac_add(struct net_device *dev, void *p)
 980 {
 981         struct sockaddr *addr = p;
 982         struct greth_private *greth;
 983         struct greth_regs *regs;
 984
 985         greth = netdev_priv(dev);
 986         regs = (struct greth_regs *) greth->regs;
 987
 988         if (!is_valid_ether_addr(addr->sa_data))
 989                 return -EINVAL;
 990
 991         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 992
 993         GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
 994         GRETH_REGSAVE(regs->esa_lsb,
 995                       addr->sa_data[2] << 24 | addr->
 996                       sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
 997         return 0;
 998 }
 999
1000 static u32 greth_hash_get_index(__u8 *addr)
1001 {
1002         return (ether_crc(6, addr)) & 0x3F;
1003 }
1004
1005 static void greth_set_hash_filter(struct net_device *dev)
1006 {
1007         struct netdev_hw_addr *ha;
1008         struct greth_private *greth = netdev_priv(dev);
1009         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1010         u32 mc_filter[2];
1011         unsigned int bitnr;
1012
1013         mc_filter[0] = mc_filter[1] = 0;
1014
1015         netdev_for_each_mc_addr(ha, dev) {
1016                 bitnr = greth_hash_get_index(ha->addr);
1017                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1018         }
1019
1020         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1021         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1022 }
1023
1024 static void greth_set_multicast_list(struct net_device *dev)
1025 {
1026         int cfg;
1027         struct greth_private *greth = netdev_priv(dev);
1028         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1029
1030         cfg = GRETH_REGLOAD(regs->control);
1031         if (dev->flags & IFF_PROMISC)
1032                 cfg |= GRETH_CTRL_PR;
1033         else
1034                 cfg &= ~GRETH_CTRL_PR;
1035
1036         if (greth->multicast) {
1037                 if (dev->flags & IFF_ALLMULTI) {
1038                         GRETH_REGSAVE(regs->hash_msb, -1);
1039                         GRETH_REGSAVE(regs->hash_lsb, -1);
1040                         cfg |= GRETH_CTRL_MCEN;
1041                         GRETH_REGSAVE(regs->control, cfg);
1042                         return;
1043                 }
1044
1045                 if (netdev_mc_empty(dev)) {
1046                         cfg &= ~GRETH_CTRL_MCEN;
1047                         GRETH_REGSAVE(regs->control, cfg);
1048                         return;
1049                 }
1050
1051                 /* Setup multicast filter */
1052                 greth_set_hash_filter(dev);
1053                 cfg |= GRETH_CTRL_MCEN;
1054         }
1055         GRETH_REGSAVE(regs->control, cfg);
1056 }
1057
1058 static u32 greth_get_msglevel(struct net_device *dev)
1059 {
1060         struct greth_private *greth = netdev_priv(dev);
1061         return greth->msg_enable;
1062 }
1063
1064 static void greth_set_msglevel(struct net_device *dev, u32 value)
1065 {
1066         struct greth_private *greth = netdev_priv(dev);
1067         greth->msg_enable = value;
1068 }
1069 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1070 {
1071         struct greth_private *greth = netdev_priv(dev);
1072         struct phy_device *phy = greth->phy;
1073
1074         if (!phy)
1075                 return -ENODEV;
1076
1077         return phy_ethtool_gset(phy, cmd);
1078 }
1079
1080 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1081 {
1082         struct greth_private *greth = netdev_priv(dev);
1083         struct phy_device *phy = greth->phy;
1084
1085         if (!phy)
1086                 return -ENODEV;
1087
1088         return phy_ethtool_sset(phy, cmd);
1089 }
1090
1091 static int greth_get_regs_len(struct net_device *dev)
1092 {
1093         return sizeof(struct greth_regs);
1094 }
1095
1096 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1097 {
1098         struct greth_private *greth = netdev_priv(dev);
1099
1100         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1101         strncpy(info->version, "revision: 1.0", 32);
1102         strncpy(info->bus_info, greth->dev->bus->name, 32);
1103         strncpy(info->fw_version, "N/A", 32);
1104         info->eedump_len = 0;
1105         info->regdump_len = sizeof(struct greth_regs);
1106 }
1107
1108 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1109 {
1110         int i;
1111         struct greth_private *greth = netdev_priv(dev);
1112         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1113         u32 *buff = p;
1114
1115         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1116                 buff[i] = greth_read_bd(&greth_regs[i]);
1117 }
1118
1119 static u32 greth_get_rx_csum(struct net_device *dev)
1120 {
1121         struct greth_private *greth = netdev_priv(dev);
1122         return (greth->flags & GRETH_FLAG_RX_CSUM) != 0;
1123 }
1124
1125 static int greth_set_rx_csum(struct net_device *dev, u32 data)
1126 {
1127         struct greth_private *greth = netdev_priv(dev);
1128
1129         spin_lock_bh(&greth->devlock);
1130
1131         if (data)
1132                 greth->flags |= GRETH_FLAG_RX_CSUM;
1133         else
1134                 greth->flags &= ~GRETH_FLAG_RX_CSUM;
1135
1136         spin_unlock_bh(&greth->devlock);
1137
1138         return 0;
1139 }
1140
1141 static u32 greth_get_tx_csum(struct net_device *dev)
1142 {
1143         return (dev->features & NETIF_F_IP_CSUM) != 0;
1144 }
1145
1146 static int greth_set_tx_csum(struct net_device *dev, u32 data)
1147 {
1148         netif_tx_lock_bh(dev);
1149         ethtool_op_set_tx_csum(dev, data);
1150         netif_tx_unlock_bh(dev);
1151         return 0;
1152 }
1153
1154 static const struct ethtool_ops greth_ethtool_ops = {
1155         .get_msglevel           = greth_get_msglevel,
1156         .set_msglevel           = greth_set_msglevel,
1157         .get_settings           = greth_get_settings,
1158         .set_settings           = greth_set_settings,
1159         .get_drvinfo            = greth_get_drvinfo,
1160         .get_regs_len           = greth_get_regs_len,
1161         .get_regs               = greth_get_regs,
1162         .get_rx_csum            = greth_get_rx_csum,
1163         .set_rx_csum            = greth_set_rx_csum,
1164         .get_tx_csum            = greth_get_tx_csum,
1165         .set_tx_csum            = greth_set_tx_csum,
1166         .get_link               = ethtool_op_get_link,
1167 };
1168
1169 static struct net_device_ops greth_netdev_ops = {
1170         .ndo_open = greth_open,
1171         .ndo_stop = greth_close,
1172         .ndo_start_xmit = greth_start_xmit,
1173         .ndo_set_mac_address = greth_set_mac_add,
1174         .ndo_validate_addr      = eth_validate_addr,
1175 };
1176
1177 static inline int wait_for_mdio(struct greth_private *greth)
1178 {
1179         unsigned long timeout = jiffies + 4*HZ/100;
1180         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1181                 if (time_after(jiffies, timeout))
1182                         return 0;
1183         }
1184         return 1;
1185 }
1186
1187 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1188 {
1189         struct greth_private *greth = bus->priv;
1190         int data;
1191
1192         if (!wait_for_mdio(greth))
1193                 return -EBUSY;
1194
1195         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1196
1197         if (!wait_for_mdio(greth))
1198                 return -EBUSY;
1199
1200         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1201                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1202                 return data;
1203
1204         } else {
1205                 return -1;
1206         }
1207 }
1208
1209 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1210 {
1211         struct greth_private *greth = bus->priv;
1212
1213         if (!wait_for_mdio(greth))
1214                 return -EBUSY;
1215
1216         GRETH_REGSAVE(greth->regs->mdio,
1217                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1218
1219         if (!wait_for_mdio(greth))
1220                 return -EBUSY;
1221
1222         return 0;
1223 }
1224
1225 static int greth_mdio_reset(struct mii_bus *bus)
1226 {
1227         return 0;
1228 }
1229
1230 static void greth_link_change(struct net_device *dev)
1231 {
1232         struct greth_private *greth = netdev_priv(dev);
1233         struct phy_device *phydev = greth->phy;
1234         unsigned long flags;
1235
1236         int status_change = 0;
1237
1238         spin_lock_irqsave(&greth->devlock, flags);
1239
1240         if (phydev->link) {
1241
1242                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1243
1244                         GRETH_REGANDIN(greth->regs->control,
1245                                        ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB));
1246
1247                         if (phydev->duplex)
1248                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_FD);
1249
1250                         if (phydev->speed == SPEED_100) {
1251
1252                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_SP);
1253                         }
1254
1255                         else if (phydev->speed == SPEED_1000)
1256                                 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_GB);
1257
1258                         greth->speed = phydev->speed;
1259                         greth->duplex = phydev->duplex;
1260                         status_change = 1;
1261                 }
1262         }
1263
1264         if (phydev->link != greth->link) {
1265                 if (!phydev->link) {
1266                         greth->speed = 0;
1267                         greth->duplex = -1;
1268                 }
1269                 greth->link = phydev->link;
1270
1271                 status_change = 1;
1272         }
1273
1274         spin_unlock_irqrestore(&greth->devlock, flags);
1275
1276         if (status_change) {
1277                 if (phydev->link)
1278                         pr_debug("%s: link up (%d/%s)\n",
1279                                 dev->name, phydev->speed,
1280                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1281                 else
1282                         pr_debug("%s: link down\n", dev->name);
1283         }
1284 }
1285
1286 static int greth_mdio_probe(struct net_device *dev)
1287 {
1288         struct greth_private *greth = netdev_priv(dev);
1289         struct phy_device *phy = NULL;
1290         int ret;
1291
1292         /* Find the first PHY */
1293         phy = phy_find_first(greth->mdio);
1294
1295         if (!phy) {
1296                 if (netif_msg_probe(greth))
1297                         dev_err(&dev->dev, "no PHY found\n");
1298                 return -ENXIO;
1299         }
1300
1301         ret = phy_connect_direct(dev, phy, &greth_link_change,
1302                         0, greth->gbit_mac ?
1303                         PHY_INTERFACE_MODE_GMII :
1304                         PHY_INTERFACE_MODE_MII);
1305         if (ret) {
1306                 if (netif_msg_ifup(greth))
1307                         dev_err(&dev->dev, "could not attach to PHY\n");
1308                 return ret;
1309         }
1310
1311         if (greth->gbit_mac)
1312                 phy->supported &= PHY_GBIT_FEATURES;
1313         else
1314                 phy->supported &= PHY_BASIC_FEATURES;
1315
1316         phy->advertising = phy->supported;
1317
1318         greth->link = 0;
1319         greth->speed = 0;
1320         greth->duplex = -1;
1321         greth->phy = phy;
1322
1323         return 0;
1324 }
1325
1326 static inline int phy_aneg_done(struct phy_device *phydev)
1327 {
1328         int retval;
1329
1330         retval = phy_read(phydev, MII_BMSR);
1331
1332         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1333 }
1334
1335 static int greth_mdio_init(struct greth_private *greth)
1336 {
1337         int ret, phy;
1338         unsigned long timeout;
1339
1340         greth->mdio = mdiobus_alloc();
1341         if (!greth->mdio) {
1342                 return -ENOMEM;
1343         }
1344
1345         greth->mdio->name = "greth-mdio";
1346         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1347         greth->mdio->read = greth_mdio_read;
1348         greth->mdio->write = greth_mdio_write;
1349         greth->mdio->reset = greth_mdio_reset;
1350         greth->mdio->priv = greth;
1351
1352         greth->mdio->irq = greth->mdio_irqs;
1353
1354         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1355                 greth->mdio->irq[phy] = PHY_POLL;
1356
1357         ret = mdiobus_register(greth->mdio);
1358         if (ret) {
1359                 goto error;
1360         }
1361
1362         ret = greth_mdio_probe(greth->netdev);
1363         if (ret) {
1364                 if (netif_msg_probe(greth))
1365                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1366                 goto unreg_mdio;
1367         }
1368
1369         phy_start(greth->phy);
1370
1371         /* If Ethernet debug link is used make autoneg happen right away */
1372         if (greth->edcl && greth_edcl == 1) {
1373                 phy_start_aneg(greth->phy);
1374                 timeout = jiffies + 6*HZ;
1375                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1376                 }
1377                 genphy_read_status(greth->phy);
1378                 greth_link_change(greth->netdev);
1379         }
1380
1381         return 0;
1382
1383 unreg_mdio:
1384         mdiobus_unregister(greth->mdio);
1385 error:
1386         mdiobus_free(greth->mdio);
1387         return ret;
1388 }
1389
1390 /* Initialize the GRETH MAC */
1391 static int __devinit greth_of_probe(struct platform_device *ofdev, const struct of_device_id *match)
1392 {
1393         struct net_device *dev;
1394         struct greth_private *greth;
1395         struct greth_regs *regs;
1396
1397         int i;
1398         int err;
1399         int tmp;
1400         unsigned long timeout;
1401
1402         dev = alloc_etherdev(sizeof(struct greth_private));
1403
1404         if (dev == NULL)
1405                 return -ENOMEM;
1406
1407         greth = netdev_priv(dev);
1408         greth->netdev = dev;
1409         greth->dev = &ofdev->dev;
1410
1411         if (greth_debug > 0)
1412                 greth->msg_enable = greth_debug;
1413         else
1414                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1415
1416         spin_lock_init(&greth->devlock);
1417
1418         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1419                                  resource_size(&ofdev->resource[0]),
1420                                  "grlib-greth regs");
1421
1422         if (greth->regs == NULL) {
1423                 if (netif_msg_probe(greth))
1424                         dev_err(greth->dev, "ioremap failure.\n");
1425                 err = -EIO;
1426                 goto error1;
1427         }
1428
1429         regs = (struct greth_regs *) greth->regs;
1430         greth->irq = ofdev->archdata.irqs[0];
1431
1432         dev_set_drvdata(greth->dev, dev);
1433         SET_NETDEV_DEV(dev, greth->dev);
1434
1435         if (netif_msg_probe(greth))
1436                 dev_dbg(greth->dev, "reseting controller.\n");
1437
1438         /* Reset the controller. */
1439         GRETH_REGSAVE(regs->control, GRETH_RESET);
1440
1441         /* Wait for MAC to reset itself */
1442         timeout = jiffies + HZ/100;
1443         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1444                 if (time_after(jiffies, timeout)) {
1445                         err = -EIO;
1446                         if (netif_msg_probe(greth))
1447                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1448                         goto error2;
1449                 }
1450         }
1451
1452         /* Get default PHY address  */
1453         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1454
1455         /* Check if we have GBIT capable MAC */
1456         tmp = GRETH_REGLOAD(regs->control);
1457         greth->gbit_mac = (tmp >> 27) & 1;
1458
1459         /* Check for multicast capability */
1460         greth->multicast = (tmp >> 25) & 1;
1461
1462         greth->edcl = (tmp >> 31) & 1;
1463
1464         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1465          * it doesn't interfere with the software */
1466         if (greth->edcl != 0)
1467                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1468
1469         /* Check if MAC can handle MDIO interrupts */
1470         greth->mdio_int_en = (tmp >> 26) & 1;
1471
1472         err = greth_mdio_init(greth);
1473         if (err) {
1474                 if (netif_msg_probe(greth))
1475                         dev_err(greth->dev, "failed to register MDIO bus\n");
1476                 goto error2;
1477         }
1478
1479         /* Allocate TX descriptor ring in coherent memory */
1480         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1481                                                                    1024,
1482                                                                    &greth->tx_bd_base_phys,
1483                                                                    GFP_KERNEL);
1484
1485         if (!greth->tx_bd_base) {
1486                 if (netif_msg_probe(greth))
1487                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1488                 err = -ENOMEM;
1489                 goto error3;
1490         }
1491
1492         memset(greth->tx_bd_base, 0, 1024);
1493
1494         /* Allocate RX descriptor ring in coherent memory */
1495         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1496                                                                    1024,
1497                                                                    &greth->rx_bd_base_phys,
1498                                                                    GFP_KERNEL);
1499
1500         if (!greth->rx_bd_base) {
1501                 if (netif_msg_probe(greth))
1502                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1503                 err = -ENOMEM;
1504                 goto error4;
1505         }
1506
1507         memset(greth->rx_bd_base, 0, 1024);
1508
1509         /* Get MAC address from: module param, OF property or ID prom */
1510         for (i = 0; i < 6; i++) {
1511                 if (macaddr[i] != 0)
1512                         break;
1513         }
1514         if (i == 6) {
1515                 const unsigned char *addr;
1516                 int len;
1517                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1518                                         &len);
1519                 if (addr != NULL && len == 6) {
1520                         for (i = 0; i < 6; i++)
1521                                 macaddr[i] = (unsigned int) addr[i];
1522                 } else {
1523 #ifdef CONFIG_SPARC
1524                         for (i = 0; i < 6; i++)
1525                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1526 #endif
1527                 }
1528         }
1529
1530         for (i = 0; i < 6; i++)
1531                 dev->dev_addr[i] = macaddr[i];
1532
1533         macaddr[5]++;
1534
1535         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1536                 if (netif_msg_probe(greth))
1537                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1538                 err = -EINVAL;
1539                 goto error5;
1540         }
1541
1542         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1543         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1544                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1545
1546         /* Clear all pending interrupts except PHY irq */
1547         GRETH_REGSAVE(regs->status, 0xFF);
1548
1549         if (greth->gbit_mac) {
1550                 dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA;
1551                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1552                 greth->flags = GRETH_FLAG_RX_CSUM;
1553         }
1554
1555         if (greth->multicast) {
1556                 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1557                 dev->flags |= IFF_MULTICAST;
1558         } else {
1559                 dev->flags &= ~IFF_MULTICAST;
1560         }
1561
1562         dev->netdev_ops = &greth_netdev_ops;
1563         dev->ethtool_ops = &greth_ethtool_ops;
1564
1565         err = register_netdev(dev);
1566         if (err) {
1567                 if (netif_msg_probe(greth))
1568                         dev_err(greth->dev, "netdevice registration failed.\n");
1569                 goto error5;
1570         }
1571
1572         /* setup NAPI */
1573         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1574
1575         return 0;
1576
1577 error5:
1578         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1579 error4:
1580         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1581 error3:
1582         mdiobus_unregister(greth->mdio);
1583 error2:
1584         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1585 error1:
1586         free_netdev(dev);
1587         return err;
1588 }
1589
1590 static int __devexit greth_of_remove(struct platform_device *of_dev)
1591 {
1592         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1593         struct greth_private *greth = netdev_priv(ndev);
1594
1595         /* Free descriptor areas */
1596         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1597
1598         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1599
1600         dev_set_drvdata(&of_dev->dev, NULL);
1601
1602         if (greth->phy)
1603                 phy_stop(greth->phy);
1604         mdiobus_unregister(greth->mdio);
1605
1606         unregister_netdev(ndev);
1607         free_netdev(ndev);
1608
1609         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1610
1611         return 0;
1612 }
1613
1614 static struct of_device_id greth_of_match[] = {
1615         {
1616          .name = "GAISLER_ETHMAC",
1617          },
1618         {
1619          .name = "01_01d",
1620          },
1621         {},
1622 };
1623
1624 MODULE_DEVICE_TABLE(of, greth_of_match);
1625
1626 static struct of_platform_driver greth_of_driver = {
1627         .driver = {
1628                 .name = "grlib-greth",
1629                 .owner = THIS_MODULE,
1630                 .of_match_table = greth_of_match,
1631         },
1632         .probe = greth_of_probe,
1633         .remove = __devexit_p(greth_of_remove),
1634 };
1635
1636 static int __init greth_init(void)
1637 {
1638         return of_register_platform_driver(&greth_of_driver);
1639 }
1640
1641 static void __exit greth_cleanup(void)
1642 {
1643         of_unregister_platform_driver(&greth_of_driver);
1644 }
1645
1646 module_init(greth_init);
1647 module_exit(greth_cleanup);
1648
1649 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1650 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1651 MODULE_LICENSE("GPL");