drivers/net/greth.c

   1 /*
   2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
   3  *
   4  * 2005-2010 (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/dma-mapping.h>
  26 #include <linux/module.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/io.h>
  35 #include <linux/crc32.h>
  36 #include <linux/mii.h>
  37 #include <linux/of_device.h>
  38 #include <linux/of_platform.h>
  39 #include <linux/slab.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/byteorder.h>
  42
  43 #ifdef CONFIG_SPARC
  44 #include <asm/idprom.h>
  45 #endif
  46
  47 #include "greth.h"
  48
  49 #define GRETH_DEF_MSG_ENABLE      \
  50         (NETIF_MSG_DRV          | \
  51          NETIF_MSG_PROBE        | \
  52          NETIF_MSG_LINK         | \
  53          NETIF_MSG_IFDOWN       | \
  54          NETIF_MSG_IFUP         | \
  55          NETIF_MSG_RX_ERR       | \
  56          NETIF_MSG_TX_ERR)
  57
  58 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  59 module_param(greth_debug, int, 0);
  60 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  61
  62 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  63 static int macaddr[6];
  64 module_param_array(macaddr, int, NULL, 0);
  65 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  66
  67 static int greth_edcl = 1;
  68 module_param(greth_edcl, int, 0);
  69 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  70
  71 static int greth_open(struct net_device *dev);
  72 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  73            struct net_device *dev);
  74 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  75            struct net_device *dev);
  76 static int greth_rx(struct net_device *dev, int limit);
  77 static int greth_rx_gbit(struct net_device *dev, int limit);
  78 static void greth_clean_tx(struct net_device *dev);
  79 static void greth_clean_tx_gbit(struct net_device *dev);
  80 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  81 static int greth_close(struct net_device *dev);
  82 static int greth_set_mac_add(struct net_device *dev, void *p);
  83 static void greth_set_multicast_list(struct net_device *dev);
  84
  85 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  86 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  87 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  88 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  89
  90 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  91 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  92 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  93
  94 static void greth_print_rx_packet(void *addr, int len)
  95 {
  96         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  97                         addr, len, true);
  98 }
  99
 100 static void greth_print_tx_packet(struct sk_buff *skb)
 101 {
 102         int i;
 103         int length;
 104
 105         if (skb_shinfo(skb)->nr_frags == 0)
 106                 length = skb->len;
 107         else
 108                 length = skb_headlen(skb);
 109
 110         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 111                         skb->data, length, true);
 112
 113         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 114
 115                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 116                                phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
 117                                skb_shinfo(skb)->frags[i].page_offset,
 118                                length, true);
 119         }
 120 }
 121
 122 static inline void greth_enable_tx(struct greth_private *greth)
 123 {
 124         wmb();
 125         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 126 }
 127
 128 static inline void greth_disable_tx(struct greth_private *greth)
 129 {
 130         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 131 }
 132
 133 static inline void greth_enable_rx(struct greth_private *greth)
 134 {
 135         wmb();
 136         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 137 }
 138
 139 static inline void greth_disable_rx(struct greth_private *greth)
 140 {
 141         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 142 }
 143
 144 static inline void greth_enable_irqs(struct greth_private *greth)
 145 {
 146         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 147 }
 148
 149 static inline void greth_disable_irqs(struct greth_private *greth)
 150 {
 151         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 152 }
 153
 154 static inline void greth_write_bd(u32 *bd, u32 val)
 155 {
 156         __raw_writel(cpu_to_be32(val), bd);
 157 }
 158
 159 static inline u32 greth_read_bd(u32 *bd)
 160 {
 161         return be32_to_cpu(__raw_readl(bd));
 162 }
 163
 164 static void greth_clean_rings(struct greth_private *greth)
 165 {
 166         int i;
 167         struct greth_bd *rx_bdp = greth->rx_bd_base;
 168         struct greth_bd *tx_bdp = greth->tx_bd_base;
 169
 170         if (greth->gbit_mac) {
 171
 172                 /* Free and unmap RX buffers */
 173                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 174                         if (greth->rx_skbuff[i] != NULL) {
 175                                 dev_kfree_skb(greth->rx_skbuff[i]);
 176                                 dma_unmap_single(greth->dev,
 177                                                  greth_read_bd(&rx_bdp->addr),
 178                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 179                                                  DMA_FROM_DEVICE);
 180                         }
 181                 }
 182
 183                 /* TX buffers */
 184                 while (greth->tx_free < GRETH_TXBD_NUM) {
 185
 186                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 187                         int nr_frags = skb_shinfo(skb)->nr_frags;
 188                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 189                         greth->tx_last = NEXT_TX(greth->tx_last);
 190
 191                         dma_unmap_single(greth->dev,
 192                                          greth_read_bd(&tx_bdp->addr),
 193                                          skb_headlen(skb),
 194                                          DMA_TO_DEVICE);
 195
 196                         for (i = 0; i < nr_frags; i++) {
 197                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 198                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 199
 200                                 dma_unmap_page(greth->dev,
 201                                                greth_read_bd(&tx_bdp->addr),
 202                                                frag->size,
 203                                                DMA_TO_DEVICE);
 204
 205                                 greth->tx_last = NEXT_TX(greth->tx_last);
 206                         }
 207                         greth->tx_free += nr_frags+1;
 208                         dev_kfree_skb(skb);
 209                 }
 210
 211
 212         } else { /* 10/100 Mbps MAC */
 213
 214                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 215                         kfree(greth->rx_bufs[i]);
 216                         dma_unmap_single(greth->dev,
 217                                          greth_read_bd(&rx_bdp->addr),
 218                                          MAX_FRAME_SIZE,
 219                                          DMA_FROM_DEVICE);
 220                 }
 221                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 222                         kfree(greth->tx_bufs[i]);
 223                         dma_unmap_single(greth->dev,
 224                                          greth_read_bd(&tx_bdp->addr),
 225                                          MAX_FRAME_SIZE,
 226                                          DMA_TO_DEVICE);
 227                 }
 228         }
 229 }
 230
 231 static int greth_init_rings(struct greth_private *greth)
 232 {
 233         struct sk_buff *skb;
 234         struct greth_bd *rx_bd, *tx_bd;
 235         u32 dma_addr;
 236         int i;
 237
 238         rx_bd = greth->rx_bd_base;
 239         tx_bd = greth->tx_bd_base;
 240
 241         /* Initialize descriptor rings and buffers */
 242         if (greth->gbit_mac) {
 243
 244                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 245                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 246                         if (skb == NULL) {
 247                                 if (netif_msg_ifup(greth))
 248                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 249                                 goto cleanup;
 250                         }
 251                         skb_reserve(skb, NET_IP_ALIGN);
 252                         dma_addr = dma_map_single(greth->dev,
 253                                                   skb->data,
 254                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 255                                                   DMA_FROM_DEVICE);
 256
 257                         if (dma_mapping_error(greth->dev, dma_addr)) {
 258                                 if (netif_msg_ifup(greth))
 259                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 260                                 goto cleanup;
 261                         }
 262                         greth->rx_skbuff[i] = skb;
 263                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 264                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 265                 }
 266
 267         } else {
 268
 269                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 270                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 271
 272                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 273
 274                         if (greth->rx_bufs[i] == NULL) {
 275                                 if (netif_msg_ifup(greth))
 276                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 277                                 goto cleanup;
 278                         }
 279
 280                         dma_addr = dma_map_single(greth->dev,
 281                                                   greth->rx_bufs[i],
 282                                                   MAX_FRAME_SIZE,
 283                                                   DMA_FROM_DEVICE);
 284
 285                         if (dma_mapping_error(greth->dev, dma_addr)) {
 286                                 if (netif_msg_ifup(greth))
 287                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 288                                 goto cleanup;
 289                         }
 290                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 291                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 292                 }
 293                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 294
 295                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 296
 297                         if (greth->tx_bufs[i] == NULL) {
 298                                 if (netif_msg_ifup(greth))
 299                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 300                                 goto cleanup;
 301                         }
 302
 303                         dma_addr = dma_map_single(greth->dev,
 304                                                   greth->tx_bufs[i],
 305                                                   MAX_FRAME_SIZE,
 306                                                   DMA_TO_DEVICE);
 307
 308                         if (dma_mapping_error(greth->dev, dma_addr)) {
 309                                 if (netif_msg_ifup(greth))
 310                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 311                                 goto cleanup;
 312                         }
 313                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 314                         greth_write_bd(&tx_bd[i].stat, 0);
 315                 }
 316         }
 317         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 318                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 319
 320         /* Initialize pointers. */
 321         greth->rx_cur = 0;
 322         greth->tx_next = 0;
 323         greth->tx_last = 0;
 324         greth->tx_free = GRETH_TXBD_NUM;
 325
 326         /* Initialize descriptor base address */
 327         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 328         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 329
 330         return 0;
 331
 332 cleanup:
 333         greth_clean_rings(greth);
 334         return -ENOMEM;
 335 }
 336
 337 static int greth_open(struct net_device *dev)
 338 {
 339         struct greth_private *greth = netdev_priv(dev);
 340         int err;
 341
 342         err = greth_init_rings(greth);
 343         if (err) {
 344                 if (netif_msg_ifup(greth))
 345                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 346                 return err;
 347         }
 348
 349         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 350         if (err) {
 351                 if (netif_msg_ifup(greth))
 352                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 353                 greth_clean_rings(greth);
 354                 return err;
 355         }
 356
 357         if (netif_msg_ifup(greth))
 358                 dev_dbg(&dev->dev, " starting queue\n");
 359         netif_start_queue(dev);
 360
 361         GRETH_REGSAVE(greth->regs->status, 0xFF);
 362
 363         napi_enable(&greth->napi);
 364
 365         greth_enable_irqs(greth);
 366         greth_enable_tx(greth);
 367         greth_enable_rx(greth);
 368         return 0;
 369
 370 }
 371
 372 static int greth_close(struct net_device *dev)
 373 {
 374         struct greth_private *greth = netdev_priv(dev);
 375
 376         napi_disable(&greth->napi);
 377
 378         greth_disable_irqs(greth);
 379         greth_disable_tx(greth);
 380         greth_disable_rx(greth);
 381
 382         netif_stop_queue(dev);
 383
 384         free_irq(greth->irq, (void *) dev);
 385
 386         greth_clean_rings(greth);
 387
 388         return 0;
 389 }
 390
 391 static netdev_tx_t
 392 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 393 {
 394         struct greth_private *greth = netdev_priv(dev);
 395         struct greth_bd *bdp;
 396         int err = NETDEV_TX_OK;
 397         u32 status, dma_addr, ctrl;
 398         unsigned long flags;
 399
 400         /* Clean TX Ring */
 401         greth_clean_tx(greth->netdev);
 402
 403         if (unlikely(greth->tx_free <= 0)) {
 404                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 405                 ctrl = GRETH_REGLOAD(greth->regs->control);
 406                 /* Enable TX IRQ only if not already in poll() routine */
 407                 if (ctrl & GRETH_RXI)
 408                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 409                 netif_stop_queue(dev);
 410                 spin_unlock_irqrestore(&greth->devlock, flags);
 411                 return NETDEV_TX_BUSY;
 412         }
 413
 414         if (netif_msg_pktdata(greth))
 415                 greth_print_tx_packet(skb);
 416
 417
 418         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 419                 dev->stats.tx_errors++;
 420                 goto out;
 421         }
 422
 423         bdp = greth->tx_bd_base + greth->tx_next;
 424         dma_addr = greth_read_bd(&bdp->addr);
 425
 426         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 427
 428         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 429
 430         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 431         greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
 432
 433         /* Wrap around descriptor ring */
 434         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 435                 status |= GRETH_BD_WR;
 436         }
 437
 438         greth->tx_next = NEXT_TX(greth->tx_next);
 439         greth->tx_free--;
 440
 441         /* Write descriptor control word and enable transmission */
 442         greth_write_bd(&bdp->stat, status);
 443         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 444         greth_enable_tx(greth);
 445         spin_unlock_irqrestore(&greth->devlock, flags);
 446
 447 out:
 448         dev_kfree_skb(skb);
 449         return err;
 450 }
 451
 452
 453 static netdev_tx_t
 454 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 455 {
 456         struct greth_private *greth = netdev_priv(dev);
 457         struct greth_bd *bdp;
 458         u32 status = 0, dma_addr, ctrl;
 459         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 460         unsigned long flags;
 461
 462         nr_frags = skb_shinfo(skb)->nr_frags;
 463
 464         /* Clean TX Ring */
 465         greth_clean_tx_gbit(dev);
 466
 467         if (greth->tx_free < nr_frags + 1) {
 468                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 469                 ctrl = GRETH_REGLOAD(greth->regs->control);
 470                 /* Enable TX IRQ only if not already in poll() routine */
 471                 if (ctrl & GRETH_RXI)
 472                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 473                 netif_stop_queue(dev);
 474                 spin_unlock_irqrestore(&greth->devlock, flags);
 475                 err = NETDEV_TX_BUSY;
 476                 goto out;
 477         }
 478
 479         if (netif_msg_pktdata(greth))
 480                 greth_print_tx_packet(skb);
 481
 482         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 483                 dev->stats.tx_errors++;
 484                 goto out;
 485         }
 486
 487         /* Save skb pointer. */
 488         greth->tx_skbuff[greth->tx_next] = skb;
 489
 490         /* Linear buf */
 491         if (nr_frags != 0)
 492                 status = GRETH_TXBD_MORE;
 493
 494         if (skb->ip_summed == CHECKSUM_PARTIAL)
 495                 status |= GRETH_TXBD_CSALL;
 496         status |= skb_headlen(skb) & GRETH_BD_LEN;
 497         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 498                 status |= GRETH_BD_WR;
 499
 500
 501         bdp = greth->tx_bd_base + greth->tx_next;
 502         greth_write_bd(&bdp->stat, status);
 503         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 504
 505         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 506                 goto map_error;
 507
 508         greth_write_bd(&bdp->addr, dma_addr);
 509
 510         curr_tx = NEXT_TX(greth->tx_next);
 511
 512         /* Frags */
 513         for (i = 0; i < nr_frags; i++) {
 514                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 515                 greth->tx_skbuff[curr_tx] = NULL;
 516                 bdp = greth->tx_bd_base + curr_tx;
 517
 518                 status = GRETH_BD_EN;
 519                 if (skb->ip_summed == CHECKSUM_PARTIAL)
 520                         status |= GRETH_TXBD_CSALL;
 521                 status |= frag->size & GRETH_BD_LEN;
 522
 523                 /* Wrap around descriptor ring */
 524                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 525                         status |= GRETH_BD_WR;
 526
 527                 /* More fragments left */
 528                 if (i < nr_frags - 1)
 529                         status |= GRETH_TXBD_MORE;
 530                 else
 531                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 532
 533                 greth_write_bd(&bdp->stat, status);
 534
 535                 dma_addr = dma_map_page(greth->dev,
 536                                         frag->page,
 537                                         frag->page_offset,
 538                                         frag->size,
 539                                         DMA_TO_DEVICE);
 540
 541                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 542                         goto frag_map_error;
 543
 544                 greth_write_bd(&bdp->addr, dma_addr);
 545
 546                 curr_tx = NEXT_TX(curr_tx);
 547         }
 548
 549         wmb();
 550
 551         /* Enable the descriptor chain by enabling the first descriptor */
 552         bdp = greth->tx_bd_base + greth->tx_next;
 553         greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 554         greth->tx_next = curr_tx;
 555         greth->tx_free -= nr_frags + 1;
 556
 557         wmb();
 558
 559         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 560         greth_enable_tx(greth);
 561         spin_unlock_irqrestore(&greth->devlock, flags);
 562
 563         return NETDEV_TX_OK;
 564
 565 frag_map_error:
 566         /* Unmap SKB mappings that succeeded and disable descriptor */
 567         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 568                 bdp = greth->tx_bd_base + greth->tx_next + i;
 569                 dma_unmap_single(greth->dev,
 570                                  greth_read_bd(&bdp->addr),
 571                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 572                                  DMA_TO_DEVICE);
 573                 greth_write_bd(&bdp->stat, 0);
 574         }
 575 map_error:
 576         if (net_ratelimit())
 577                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 578         dev_kfree_skb(skb);
 579 out:
 580         return err;
 581 }
 582
 583 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 584 {
 585         struct net_device *dev = dev_id;
 586         struct greth_private *greth;
 587         u32 status, ctrl;
 588         irqreturn_t retval = IRQ_NONE;
 589
 590         greth = netdev_priv(dev);
 591
 592         spin_lock(&greth->devlock);
 593
 594         /* Get the interrupt events that caused us to be here. */
 595         status = GRETH_REGLOAD(greth->regs->status);
 596
 597         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 598          * set regardless of whether IRQ is enabled or not. Especially
 599          * important when shared IRQ.
 600          */
 601         ctrl = GRETH_REGLOAD(greth->regs->control);
 602
 603         /* Handle rx and tx interrupts through poll */
 604         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 605             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 606                 retval = IRQ_HANDLED;
 607
 608                 /* Disable interrupts and schedule poll() */
 609                 greth_disable_irqs(greth);
 610                 napi_schedule(&greth->napi);
 611         }
 612
 613         mmiowb();
 614         spin_unlock(&greth->devlock);
 615
 616         return retval;
 617 }
 618
 619 static void greth_clean_tx(struct net_device *dev)
 620 {
 621         struct greth_private *greth;
 622         struct greth_bd *bdp;
 623         u32 stat;
 624
 625         greth = netdev_priv(dev);
 626
 627         while (1) {
 628                 bdp = greth->tx_bd_base + greth->tx_last;
 629                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 630                 mb();
 631                 stat = greth_read_bd(&bdp->stat);
 632
 633                 if (unlikely(stat & GRETH_BD_EN))
 634                         break;
 635
 636                 if (greth->tx_free == GRETH_TXBD_NUM)
 637                         break;
 638
 639                 /* Check status for errors */
 640                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 641                         dev->stats.tx_errors++;
 642                         if (stat & GRETH_TXBD_ERR_AL)
 643                                 dev->stats.tx_aborted_errors++;
 644                         if (stat & GRETH_TXBD_ERR_UE)
 645                                 dev->stats.tx_fifo_errors++;
 646                 }
 647                 dev->stats.tx_packets++;
 648                 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
 649                 greth->tx_last = NEXT_TX(greth->tx_last);
 650                 greth->tx_free++;
 651         }
 652
 653         if (greth->tx_free > 0) {
 654                 netif_wake_queue(dev);
 655         }
 656
 657 }
 658
 659 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 660 {
 661         /* Check status for errors */
 662         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 663                 dev->stats.tx_errors++;
 664                 if (stat & GRETH_TXBD_ERR_AL)
 665                         dev->stats.tx_aborted_errors++;
 666                 if (stat & GRETH_TXBD_ERR_UE)
 667                         dev->stats.tx_fifo_errors++;
 668                 if (stat & GRETH_TXBD_ERR_LC)
 669                         dev->stats.tx_aborted_errors++;
 670         }
 671         dev->stats.tx_packets++;
 672 }
 673
 674 static void greth_clean_tx_gbit(struct net_device *dev)
 675 {
 676         struct greth_private *greth;
 677         struct greth_bd *bdp, *bdp_last_frag;
 678         struct sk_buff *skb;
 679         u32 stat;
 680         int nr_frags, i;
 681
 682         greth = netdev_priv(dev);
 683
 684         while (greth->tx_free < GRETH_TXBD_NUM) {
 685
 686                 skb = greth->tx_skbuff[greth->tx_last];
 687
 688                 nr_frags = skb_shinfo(skb)->nr_frags;
 689
 690                 /* We only clean fully completed SKBs */
 691                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
 692
 693                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 694                 mb();
 695                 stat = greth_read_bd(&bdp_last_frag->stat);
 696
 697                 if (stat & GRETH_BD_EN)
 698                         break;
 699
 700                 greth->tx_skbuff[greth->tx_last] = NULL;
 701
 702                 greth_update_tx_stats(dev, stat);
 703                 dev->stats.tx_bytes += skb->len;
 704
 705                 bdp = greth->tx_bd_base + greth->tx_last;
 706
 707                 greth->tx_last = NEXT_TX(greth->tx_last);
 708
 709                 dma_unmap_single(greth->dev,
 710                                  greth_read_bd(&bdp->addr),
 711                                  skb_headlen(skb),
 712                                  DMA_TO_DEVICE);
 713
 714                 for (i = 0; i < nr_frags; i++) {
 715                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 716                         bdp = greth->tx_bd_base + greth->tx_last;
 717
 718                         dma_unmap_page(greth->dev,
 719                                        greth_read_bd(&bdp->addr),
 720                                        frag->size,
 721                                        DMA_TO_DEVICE);
 722
 723                         greth->tx_last = NEXT_TX(greth->tx_last);
 724                 }
 725                 greth->tx_free += nr_frags+1;
 726                 dev_kfree_skb(skb);
 727         }
 728
 729         if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
 730                 netif_wake_queue(dev);
 731 }
 732
 733 static int greth_rx(struct net_device *dev, int limit)
 734 {
 735         struct greth_private *greth;
 736         struct greth_bd *bdp;
 737         struct sk_buff *skb;
 738         int pkt_len;
 739         int bad, count;
 740         u32 status, dma_addr;
 741         unsigned long flags;
 742
 743         greth = netdev_priv(dev);
 744
 745         for (count = 0; count < limit; ++count) {
 746
 747                 bdp = greth->rx_bd_base + greth->rx_cur;
 748                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 749                 mb();
 750                 status = greth_read_bd(&bdp->stat);
 751
 752                 if (unlikely(status & GRETH_BD_EN)) {
 753                         break;
 754                 }
 755
 756                 dma_addr = greth_read_bd(&bdp->addr);
 757                 bad = 0;
 758
 759                 /* Check status for errors. */
 760                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 761                         if (status & GRETH_RXBD_ERR_FT) {
 762                                 dev->stats.rx_length_errors++;
 763                                 bad = 1;
 764                         }
 765                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 766                                 dev->stats.rx_frame_errors++;
 767                                 bad = 1;
 768                         }
 769                         if (status & GRETH_RXBD_ERR_CRC) {
 770                                 dev->stats.rx_crc_errors++;
 771                                 bad = 1;
 772                         }
 773                 }
 774                 if (unlikely(bad)) {
 775                         dev->stats.rx_errors++;
 776
 777                 } else {
 778
 779                         pkt_len = status & GRETH_BD_LEN;
 780
 781                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 782
 783                         if (unlikely(skb == NULL)) {
 784
 785                                 if (net_ratelimit())
 786                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 787
 788                                 dev->stats.rx_dropped++;
 789
 790                         } else {
 791                                 skb_reserve(skb, NET_IP_ALIGN);
 792                                 skb->dev = dev;
 793
 794                                 dma_sync_single_for_cpu(greth->dev,
 795                                                         dma_addr,
 796                                                         pkt_len,
 797                                                         DMA_FROM_DEVICE);
 798
 799                                 if (netif_msg_pktdata(greth))
 800                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 801
 802                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
 803
 804                                 skb->protocol = eth_type_trans(skb, dev);
 805                                 dev->stats.rx_bytes += pkt_len;
 806                                 dev->stats.rx_packets++;
 807                                 netif_receive_skb(skb);
 808                         }
 809                 }
 810
 811                 status = GRETH_BD_EN | GRETH_BD_IE;
 812                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 813                         status |= GRETH_BD_WR;
 814                 }
 815
 816                 wmb();
 817                 greth_write_bd(&bdp->stat, status);
 818
 819                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 820
 821                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 822                 greth_enable_rx(greth);
 823                 spin_unlock_irqrestore(&greth->devlock, flags);
 824
 825                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 826         }
 827
 828         return count;
 829 }
 830
 831 static inline int hw_checksummed(u32 status)
 832 {
 833
 834         if (status & GRETH_RXBD_IP_FRAG)
 835                 return 0;
 836
 837         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 838                 return 0;
 839
 840         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 841                 return 0;
 842
 843         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 844                 return 0;
 845
 846         return 1;
 847 }
 848
 849 static int greth_rx_gbit(struct net_device *dev, int limit)
 850 {
 851         struct greth_private *greth;
 852         struct greth_bd *bdp;
 853         struct sk_buff *skb, *newskb;
 854         int pkt_len;
 855         int bad, count = 0;
 856         u32 status, dma_addr;
 857         unsigned long flags;
 858
 859         greth = netdev_priv(dev);
 860
 861         for (count = 0; count < limit; ++count) {
 862
 863                 bdp = greth->rx_bd_base + greth->rx_cur;
 864                 skb = greth->rx_skbuff[greth->rx_cur];
 865                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 866                 mb();
 867                 status = greth_read_bd(&bdp->stat);
 868                 bad = 0;
 869
 870                 if (status & GRETH_BD_EN)
 871                         break;
 872
 873                 /* Check status for errors. */
 874                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 875
 876                         if (status & GRETH_RXBD_ERR_FT) {
 877                                 dev->stats.rx_length_errors++;
 878                                 bad = 1;
 879                         } else if (status &
 880                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 881                                 dev->stats.rx_frame_errors++;
 882                                 bad = 1;
 883                         } else if (status & GRETH_RXBD_ERR_CRC) {
 884                                 dev->stats.rx_crc_errors++;
 885                                 bad = 1;
 886                         }
 887                 }
 888
 889                 /* Allocate new skb to replace current, not needed if the
 890                  * current skb can be reused */
 891                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 892                         skb_reserve(newskb, NET_IP_ALIGN);
 893
 894                         dma_addr = dma_map_single(greth->dev,
 895                                                       newskb->data,
 896                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 897                                                       DMA_FROM_DEVICE);
 898
 899                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 900                                 /* Process the incoming frame. */
 901                                 pkt_len = status & GRETH_BD_LEN;
 902
 903                                 dma_unmap_single(greth->dev,
 904                                                  greth_read_bd(&bdp->addr),
 905                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 906                                                  DMA_FROM_DEVICE);
 907
 908                                 if (netif_msg_pktdata(greth))
 909                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 910
 911                                 skb_put(skb, pkt_len);
 912
 913                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 914                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 915                                 else
 916                                         skb_checksum_none_assert(skb);
 917
 918                                 skb->protocol = eth_type_trans(skb, dev);
 919                                 dev->stats.rx_packets++;
 920                                 dev->stats.rx_bytes += pkt_len;
 921                                 netif_receive_skb(skb);
 922
 923                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 924                                 greth_write_bd(&bdp->addr, dma_addr);
 925                         } else {
 926                                 if (net_ratelimit())
 927                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 928                                 dev_kfree_skb(newskb);
 929                                 /* reusing current skb, so it is a drop */
 930                                 dev->stats.rx_dropped++;
 931                         }
 932                 } else if (bad) {
 933                         /* Bad Frame transfer, the skb is reused */
 934                         dev->stats.rx_dropped++;
 935                 } else {
 936                         /* Failed Allocating a new skb. This is rather stupid
 937                          * but the current "filled" skb is reused, as if
 938                          * transfer failure. One could argue that RX descriptor
 939                          * table handling should be divided into cleaning and
 940                          * filling as the TX part of the driver
 941                          */
 942                         if (net_ratelimit())
 943                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 944                         /* reusing current skb, so it is a drop */
 945                         dev->stats.rx_dropped++;
 946                 }
 947
 948                 status = GRETH_BD_EN | GRETH_BD_IE;
 949                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 950                         status |= GRETH_BD_WR;
 951                 }
 952
 953                 wmb();
 954                 greth_write_bd(&bdp->stat, status);
 955                 spin_lock_irqsave(&greth->devlock, flags);
 956                 greth_enable_rx(greth);
 957                 spin_unlock_irqrestore(&greth->devlock, flags);
 958                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 959         }
 960
 961         return count;
 962
 963 }
 964
 965 static int greth_poll(struct napi_struct *napi, int budget)
 966 {
 967         struct greth_private *greth;
 968         int work_done = 0;
 969         unsigned long flags;
 970         u32 mask, ctrl;
 971         greth = container_of(napi, struct greth_private, napi);
 972
 973 restart_txrx_poll:
 974         if (netif_queue_stopped(greth->netdev)) {
 975                 if (greth->gbit_mac)
 976                         greth_clean_tx_gbit(greth->netdev);
 977                 else
 978                         greth_clean_tx(greth->netdev);
 979         }
 980
 981         if (greth->gbit_mac) {
 982                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 983         } else {
 984                 work_done += greth_rx(greth->netdev, budget - work_done);
 985         }
 986
 987         if (work_done < budget) {
 988
 989                 spin_lock_irqsave(&greth->devlock, flags);
 990
 991                 ctrl = GRETH_REGLOAD(greth->regs->control);
 992                 if (netif_queue_stopped(greth->netdev)) {
 993                         GRETH_REGSAVE(greth->regs->control,
 994                                         ctrl | GRETH_TXI | GRETH_RXI);
 995                         mask = GRETH_INT_RX | GRETH_INT_RE |
 996                                GRETH_INT_TX | GRETH_INT_TE;
 997                 } else {
 998                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
 999                         mask = GRETH_INT_RX | GRETH_INT_RE;
1000                 }
1001
1002                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1003                         GRETH_REGSAVE(greth->regs->control, ctrl);
1004                         spin_unlock_irqrestore(&greth->devlock, flags);
1005                         goto restart_txrx_poll;
1006                 } else {
1007                         __napi_complete(napi);
1008                         spin_unlock_irqrestore(&greth->devlock, flags);
1009                 }
1010         }
1011
1012         return work_done;
1013 }
1014
1015 static int greth_set_mac_add(struct net_device *dev, void *p)
1016 {
1017         struct sockaddr *addr = p;
1018         struct greth_private *greth;
1019         struct greth_regs *regs;
1020
1021         greth = netdev_priv(dev);
1022         regs = (struct greth_regs *) greth->regs;
1023
1024         if (!is_valid_ether_addr(addr->sa_data))
1025                 return -EINVAL;
1026
1027         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1028         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1029         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1030                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1031
1032         return 0;
1033 }
1034
1035 static u32 greth_hash_get_index(__u8 *addr)
1036 {
1037         return (ether_crc(6, addr)) & 0x3F;
1038 }
1039
1040 static void greth_set_hash_filter(struct net_device *dev)
1041 {
1042         struct netdev_hw_addr *ha;
1043         struct greth_private *greth = netdev_priv(dev);
1044         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1045         u32 mc_filter[2];
1046         unsigned int bitnr;
1047
1048         mc_filter[0] = mc_filter[1] = 0;
1049
1050         netdev_for_each_mc_addr(ha, dev) {
1051                 bitnr = greth_hash_get_index(ha->addr);
1052                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1053         }
1054
1055         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1056         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1057 }
1058
1059 static void greth_set_multicast_list(struct net_device *dev)
1060 {
1061         int cfg;
1062         struct greth_private *greth = netdev_priv(dev);
1063         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1064
1065         cfg = GRETH_REGLOAD(regs->control);
1066         if (dev->flags & IFF_PROMISC)
1067                 cfg |= GRETH_CTRL_PR;
1068         else
1069                 cfg &= ~GRETH_CTRL_PR;
1070
1071         if (greth->multicast) {
1072                 if (dev->flags & IFF_ALLMULTI) {
1073                         GRETH_REGSAVE(regs->hash_msb, -1);
1074                         GRETH_REGSAVE(regs->hash_lsb, -1);
1075                         cfg |= GRETH_CTRL_MCEN;
1076                         GRETH_REGSAVE(regs->control, cfg);
1077                         return;
1078                 }
1079
1080                 if (netdev_mc_empty(dev)) {
1081                         cfg &= ~GRETH_CTRL_MCEN;
1082                         GRETH_REGSAVE(regs->control, cfg);
1083                         return;
1084                 }
1085
1086                 /* Setup multicast filter */
1087                 greth_set_hash_filter(dev);
1088                 cfg |= GRETH_CTRL_MCEN;
1089         }
1090         GRETH_REGSAVE(regs->control, cfg);
1091 }
1092
1093 static u32 greth_get_msglevel(struct net_device *dev)
1094 {
1095         struct greth_private *greth = netdev_priv(dev);
1096         return greth->msg_enable;
1097 }
1098
1099 static void greth_set_msglevel(struct net_device *dev, u32 value)
1100 {
1101         struct greth_private *greth = netdev_priv(dev);
1102         greth->msg_enable = value;
1103 }
1104 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1105 {
1106         struct greth_private *greth = netdev_priv(dev);
1107         struct phy_device *phy = greth->phy;
1108
1109         if (!phy)
1110                 return -ENODEV;
1111
1112         return phy_ethtool_gset(phy, cmd);
1113 }
1114
1115 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1116 {
1117         struct greth_private *greth = netdev_priv(dev);
1118         struct phy_device *phy = greth->phy;
1119
1120         if (!phy)
1121                 return -ENODEV;
1122
1123         return phy_ethtool_sset(phy, cmd);
1124 }
1125
1126 static int greth_get_regs_len(struct net_device *dev)
1127 {
1128         return sizeof(struct greth_regs);
1129 }
1130
1131 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1132 {
1133         struct greth_private *greth = netdev_priv(dev);
1134
1135         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1136         strncpy(info->version, "revision: 1.0", 32);
1137         strncpy(info->bus_info, greth->dev->bus->name, 32);
1138         strncpy(info->fw_version, "N/A", 32);
1139         info->eedump_len = 0;
1140         info->regdump_len = sizeof(struct greth_regs);
1141 }
1142
1143 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1144 {
1145         int i;
1146         struct greth_private *greth = netdev_priv(dev);
1147         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1148         u32 *buff = p;
1149
1150         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1151                 buff[i] = greth_read_bd(&greth_regs[i]);
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_link               = ethtool_op_get_link,
1163 };
1164
1165 static struct net_device_ops greth_netdev_ops = {
1166         .ndo_open               = greth_open,
1167         .ndo_stop               = greth_close,
1168         .ndo_start_xmit         = greth_start_xmit,
1169         .ndo_set_mac_address    = greth_set_mac_add,
1170         .ndo_validate_addr      = eth_validate_addr,
1171 };
1172
1173 static inline int wait_for_mdio(struct greth_private *greth)
1174 {
1175         unsigned long timeout = jiffies + 4*HZ/100;
1176         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1177                 if (time_after(jiffies, timeout))
1178                         return 0;
1179         }
1180         return 1;
1181 }
1182
1183 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1184 {
1185         struct greth_private *greth = bus->priv;
1186         int data;
1187
1188         if (!wait_for_mdio(greth))
1189                 return -EBUSY;
1190
1191         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1192
1193         if (!wait_for_mdio(greth))
1194                 return -EBUSY;
1195
1196         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1197                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1198                 return data;
1199
1200         } else {
1201                 return -1;
1202         }
1203 }
1204
1205 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1206 {
1207         struct greth_private *greth = bus->priv;
1208
1209         if (!wait_for_mdio(greth))
1210                 return -EBUSY;
1211
1212         GRETH_REGSAVE(greth->regs->mdio,
1213                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1214
1215         if (!wait_for_mdio(greth))
1216                 return -EBUSY;
1217
1218         return 0;
1219 }
1220
1221 static int greth_mdio_reset(struct mii_bus *bus)
1222 {
1223         return 0;
1224 }
1225
1226 static void greth_link_change(struct net_device *dev)
1227 {
1228         struct greth_private *greth = netdev_priv(dev);
1229         struct phy_device *phydev = greth->phy;
1230         unsigned long flags;
1231         int status_change = 0;
1232         u32 ctrl;
1233
1234         spin_lock_irqsave(&greth->devlock, flags);
1235
1236         if (phydev->link) {
1237
1238                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1239                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1240                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1241
1242                         if (phydev->duplex)
1243                                 ctrl |= GRETH_CTRL_FD;
1244
1245                         if (phydev->speed == SPEED_100)
1246                                 ctrl |= GRETH_CTRL_SP;
1247                         else if (phydev->speed == SPEED_1000)
1248                                 ctrl |= GRETH_CTRL_GB;
1249
1250                         GRETH_REGSAVE(greth->regs->control, ctrl);
1251                         greth->speed = phydev->speed;
1252                         greth->duplex = phydev->duplex;
1253                         status_change = 1;
1254                 }
1255         }
1256
1257         if (phydev->link != greth->link) {
1258                 if (!phydev->link) {
1259                         greth->speed = 0;
1260                         greth->duplex = -1;
1261                 }
1262                 greth->link = phydev->link;
1263
1264                 status_change = 1;
1265         }
1266
1267         spin_unlock_irqrestore(&greth->devlock, flags);
1268
1269         if (status_change) {
1270                 if (phydev->link)
1271                         pr_debug("%s: link up (%d/%s)\n",
1272                                 dev->name, phydev->speed,
1273                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1274                 else
1275                         pr_debug("%s: link down\n", dev->name);
1276         }
1277 }
1278
1279 static int greth_mdio_probe(struct net_device *dev)
1280 {
1281         struct greth_private *greth = netdev_priv(dev);
1282         struct phy_device *phy = NULL;
1283         int ret;
1284
1285         /* Find the first PHY */
1286         phy = phy_find_first(greth->mdio);
1287
1288         if (!phy) {
1289                 if (netif_msg_probe(greth))
1290                         dev_err(&dev->dev, "no PHY found\n");
1291                 return -ENXIO;
1292         }
1293
1294         ret = phy_connect_direct(dev, phy, &greth_link_change,
1295                         0, greth->gbit_mac ?
1296                         PHY_INTERFACE_MODE_GMII :
1297                         PHY_INTERFACE_MODE_MII);
1298         if (ret) {
1299                 if (netif_msg_ifup(greth))
1300                         dev_err(&dev->dev, "could not attach to PHY\n");
1301                 return ret;
1302         }
1303
1304         if (greth->gbit_mac)
1305                 phy->supported &= PHY_GBIT_FEATURES;
1306         else
1307                 phy->supported &= PHY_BASIC_FEATURES;
1308
1309         phy->advertising = phy->supported;
1310
1311         greth->link = 0;
1312         greth->speed = 0;
1313         greth->duplex = -1;
1314         greth->phy = phy;
1315
1316         return 0;
1317 }
1318
1319 static inline int phy_aneg_done(struct phy_device *phydev)
1320 {
1321         int retval;
1322
1323         retval = phy_read(phydev, MII_BMSR);
1324
1325         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1326 }
1327
1328 static int greth_mdio_init(struct greth_private *greth)
1329 {
1330         int ret, phy;
1331         unsigned long timeout;
1332
1333         greth->mdio = mdiobus_alloc();
1334         if (!greth->mdio) {
1335                 return -ENOMEM;
1336         }
1337
1338         greth->mdio->name = "greth-mdio";
1339         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1340         greth->mdio->read = greth_mdio_read;
1341         greth->mdio->write = greth_mdio_write;
1342         greth->mdio->reset = greth_mdio_reset;
1343         greth->mdio->priv = greth;
1344
1345         greth->mdio->irq = greth->mdio_irqs;
1346
1347         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1348                 greth->mdio->irq[phy] = PHY_POLL;
1349
1350         ret = mdiobus_register(greth->mdio);
1351         if (ret) {
1352                 goto error;
1353         }
1354
1355         ret = greth_mdio_probe(greth->netdev);
1356         if (ret) {
1357                 if (netif_msg_probe(greth))
1358                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1359                 goto unreg_mdio;
1360         }
1361
1362         phy_start(greth->phy);
1363
1364         /* If Ethernet debug link is used make autoneg happen right away */
1365         if (greth->edcl && greth_edcl == 1) {
1366                 phy_start_aneg(greth->phy);
1367                 timeout = jiffies + 6*HZ;
1368                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1369                 }
1370                 genphy_read_status(greth->phy);
1371                 greth_link_change(greth->netdev);
1372         }
1373
1374         return 0;
1375
1376 unreg_mdio:
1377         mdiobus_unregister(greth->mdio);
1378 error:
1379         mdiobus_free(greth->mdio);
1380         return ret;
1381 }
1382
1383 /* Initialize the GRETH MAC */
1384 static int __devinit greth_of_probe(struct platform_device *ofdev)
1385 {
1386         struct net_device *dev;
1387         struct greth_private *greth;
1388         struct greth_regs *regs;
1389
1390         int i;
1391         int err;
1392         int tmp;
1393         unsigned long timeout;
1394
1395         dev = alloc_etherdev(sizeof(struct greth_private));
1396
1397         if (dev == NULL)
1398                 return -ENOMEM;
1399
1400         greth = netdev_priv(dev);
1401         greth->netdev = dev;
1402         greth->dev = &ofdev->dev;
1403
1404         if (greth_debug > 0)
1405                 greth->msg_enable = greth_debug;
1406         else
1407                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1408
1409         spin_lock_init(&greth->devlock);
1410
1411         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1412                                  resource_size(&ofdev->resource[0]),
1413                                  "grlib-greth regs");
1414
1415         if (greth->regs == NULL) {
1416                 if (netif_msg_probe(greth))
1417                         dev_err(greth->dev, "ioremap failure.\n");
1418                 err = -EIO;
1419                 goto error1;
1420         }
1421
1422         regs = (struct greth_regs *) greth->regs;
1423         greth->irq = ofdev->archdata.irqs[0];
1424
1425         dev_set_drvdata(greth->dev, dev);
1426         SET_NETDEV_DEV(dev, greth->dev);
1427
1428         if (netif_msg_probe(greth))
1429                 dev_dbg(greth->dev, "reseting controller.\n");
1430
1431         /* Reset the controller. */
1432         GRETH_REGSAVE(regs->control, GRETH_RESET);
1433
1434         /* Wait for MAC to reset itself */
1435         timeout = jiffies + HZ/100;
1436         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1437                 if (time_after(jiffies, timeout)) {
1438                         err = -EIO;
1439                         if (netif_msg_probe(greth))
1440                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1441                         goto error2;
1442                 }
1443         }
1444
1445         /* Get default PHY address  */
1446         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1447
1448         /* Check if we have GBIT capable MAC */
1449         tmp = GRETH_REGLOAD(regs->control);
1450         greth->gbit_mac = (tmp >> 27) & 1;
1451
1452         /* Check for multicast capability */
1453         greth->multicast = (tmp >> 25) & 1;
1454
1455         greth->edcl = (tmp >> 31) & 1;
1456
1457         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1458          * it doesn't interfere with the software */
1459         if (greth->edcl != 0)
1460                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1461
1462         /* Check if MAC can handle MDIO interrupts */
1463         greth->mdio_int_en = (tmp >> 26) & 1;
1464
1465         err = greth_mdio_init(greth);
1466         if (err) {
1467                 if (netif_msg_probe(greth))
1468                         dev_err(greth->dev, "failed to register MDIO bus\n");
1469                 goto error2;
1470         }
1471
1472         /* Allocate TX descriptor ring in coherent memory */
1473         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1474                                                                    1024,
1475                                                                    &greth->tx_bd_base_phys,
1476                                                                    GFP_KERNEL);
1477
1478         if (!greth->tx_bd_base) {
1479                 if (netif_msg_probe(greth))
1480                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1481                 err = -ENOMEM;
1482                 goto error3;
1483         }
1484
1485         memset(greth->tx_bd_base, 0, 1024);
1486
1487         /* Allocate RX descriptor ring in coherent memory */
1488         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1489                                                                    1024,
1490                                                                    &greth->rx_bd_base_phys,
1491                                                                    GFP_KERNEL);
1492
1493         if (!greth->rx_bd_base) {
1494                 if (netif_msg_probe(greth))
1495                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1496                 err = -ENOMEM;
1497                 goto error4;
1498         }
1499
1500         memset(greth->rx_bd_base, 0, 1024);
1501
1502         /* Get MAC address from: module param, OF property or ID prom */
1503         for (i = 0; i < 6; i++) {
1504                 if (macaddr[i] != 0)
1505                         break;
1506         }
1507         if (i == 6) {
1508                 const unsigned char *addr;
1509                 int len;
1510                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1511                                         &len);
1512                 if (addr != NULL && len == 6) {
1513                         for (i = 0; i < 6; i++)
1514                                 macaddr[i] = (unsigned int) addr[i];
1515                 } else {
1516 #ifdef CONFIG_SPARC
1517                         for (i = 0; i < 6; i++)
1518                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1519 #endif
1520                 }
1521         }
1522
1523         for (i = 0; i < 6; i++)
1524                 dev->dev_addr[i] = macaddr[i];
1525
1526         macaddr[5]++;
1527
1528         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1529                 if (netif_msg_probe(greth))
1530                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1531                 err = -EINVAL;
1532                 goto error5;
1533         }
1534
1535         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1536         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1537                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1538
1539         /* Clear all pending interrupts except PHY irq */
1540         GRETH_REGSAVE(regs->status, 0xFF);
1541
1542         if (greth->gbit_mac) {
1543                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1544                         NETIF_F_RXCSUM;
1545                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1546                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1547         }
1548
1549         if (greth->multicast) {
1550                 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1551                 dev->flags |= IFF_MULTICAST;
1552         } else {
1553                 dev->flags &= ~IFF_MULTICAST;
1554         }
1555
1556         dev->netdev_ops = &greth_netdev_ops;
1557         dev->ethtool_ops = &greth_ethtool_ops;
1558
1559         err = register_netdev(dev);
1560         if (err) {
1561                 if (netif_msg_probe(greth))
1562                         dev_err(greth->dev, "netdevice registration failed.\n");
1563                 goto error5;
1564         }
1565
1566         /* setup NAPI */
1567         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1568
1569         return 0;
1570
1571 error5:
1572         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1573 error4:
1574         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1575 error3:
1576         mdiobus_unregister(greth->mdio);
1577 error2:
1578         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1579 error1:
1580         free_netdev(dev);
1581         return err;
1582 }
1583
1584 static int __devexit greth_of_remove(struct platform_device *of_dev)
1585 {
1586         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1587         struct greth_private *greth = netdev_priv(ndev);
1588
1589         /* Free descriptor areas */
1590         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1591
1592         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1593
1594         dev_set_drvdata(&of_dev->dev, NULL);
1595
1596         if (greth->phy)
1597                 phy_stop(greth->phy);
1598         mdiobus_unregister(greth->mdio);
1599
1600         unregister_netdev(ndev);
1601         free_netdev(ndev);
1602
1603         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1604
1605         return 0;
1606 }
1607
1608 static struct of_device_id greth_of_match[] = {
1609         {
1610          .name = "GAISLER_ETHMAC",
1611          },
1612         {
1613          .name = "01_01d",
1614          },
1615         {},
1616 };
1617
1618 MODULE_DEVICE_TABLE(of, greth_of_match);
1619
1620 static struct platform_driver greth_of_driver = {
1621         .driver = {
1622                 .name = "grlib-greth",
1623                 .owner = THIS_MODULE,
1624                 .of_match_table = greth_of_match,
1625         },
1626         .probe = greth_of_probe,
1627         .remove = __devexit_p(greth_of_remove),
1628 };
1629
1630 static int __init greth_init(void)
1631 {
1632         return platform_driver_register(&greth_of_driver);
1633 }
1634
1635 static void __exit greth_cleanup(void)
1636 {
1637         platform_driver_unregister(&greth_of_driver);
1638 }
1639
1640 module_init(greth_init);
1641 module_exit(greth_cleanup);
1642
1643 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1644 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1645 MODULE_LICENSE("GPL");