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