drivers/net/ethernet/aeroflex/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                                skb_frag_address(&skb_shinfo(skb)->frags[i]),
 117                                skb_shinfo(skb)->frags[i].size, true);
 118         }
 119 }
 120
 121 static inline void greth_enable_tx(struct greth_private *greth)
 122 {
 123         wmb();
 124         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 125 }
 126
 127 static inline void greth_disable_tx(struct greth_private *greth)
 128 {
 129         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 130 }
 131
 132 static inline void greth_enable_rx(struct greth_private *greth)
 133 {
 134         wmb();
 135         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 136 }
 137
 138 static inline void greth_disable_rx(struct greth_private *greth)
 139 {
 140         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 141 }
 142
 143 static inline void greth_enable_irqs(struct greth_private *greth)
 144 {
 145         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 146 }
 147
 148 static inline void greth_disable_irqs(struct greth_private *greth)
 149 {
 150         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 151 }
 152
 153 static inline void greth_write_bd(u32 *bd, u32 val)
 154 {
 155         __raw_writel(cpu_to_be32(val), bd);
 156 }
 157
 158 static inline u32 greth_read_bd(u32 *bd)
 159 {
 160         return be32_to_cpu(__raw_readl(bd));
 161 }
 162
 163 static void greth_clean_rings(struct greth_private *greth)
 164 {
 165         int i;
 166         struct greth_bd *rx_bdp = greth->rx_bd_base;
 167         struct greth_bd *tx_bdp = greth->tx_bd_base;
 168
 169         if (greth->gbit_mac) {
 170
 171                 /* Free and unmap RX buffers */
 172                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 173                         if (greth->rx_skbuff[i] != NULL) {
 174                                 dev_kfree_skb(greth->rx_skbuff[i]);
 175                                 dma_unmap_single(greth->dev,
 176                                                  greth_read_bd(&rx_bdp->addr),
 177                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 178                                                  DMA_FROM_DEVICE);
 179                         }
 180                 }
 181
 182                 /* TX buffers */
 183                 while (greth->tx_free < GRETH_TXBD_NUM) {
 184
 185                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 186                         int nr_frags = skb_shinfo(skb)->nr_frags;
 187                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 188                         greth->tx_last = NEXT_TX(greth->tx_last);
 189
 190                         dma_unmap_single(greth->dev,
 191                                          greth_read_bd(&tx_bdp->addr),
 192                                          skb_headlen(skb),
 193                                          DMA_TO_DEVICE);
 194
 195                         for (i = 0; i < nr_frags; i++) {
 196                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 197                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 198
 199                                 dma_unmap_page(greth->dev,
 200                                                greth_read_bd(&tx_bdp->addr),
 201                                                frag->size,
 202                                                DMA_TO_DEVICE);
 203
 204                                 greth->tx_last = NEXT_TX(greth->tx_last);
 205                         }
 206                         greth->tx_free += nr_frags+1;
 207                         dev_kfree_skb(skb);
 208                 }
 209
 210
 211         } else { /* 10/100 Mbps MAC */
 212
 213                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 214                         kfree(greth->rx_bufs[i]);
 215                         dma_unmap_single(greth->dev,
 216                                          greth_read_bd(&rx_bdp->addr),
 217                                          MAX_FRAME_SIZE,
 218                                          DMA_FROM_DEVICE);
 219                 }
 220                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 221                         kfree(greth->tx_bufs[i]);
 222                         dma_unmap_single(greth->dev,
 223                                          greth_read_bd(&tx_bdp->addr),
 224                                          MAX_FRAME_SIZE,
 225                                          DMA_TO_DEVICE);
 226                 }
 227         }
 228 }
 229
 230 static int greth_init_rings(struct greth_private *greth)
 231 {
 232         struct sk_buff *skb;
 233         struct greth_bd *rx_bd, *tx_bd;
 234         u32 dma_addr;
 235         int i;
 236
 237         rx_bd = greth->rx_bd_base;
 238         tx_bd = greth->tx_bd_base;
 239
 240         /* Initialize descriptor rings and buffers */
 241         if (greth->gbit_mac) {
 242
 243                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 244                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 245                         if (skb == NULL) {
 246                                 if (netif_msg_ifup(greth))
 247                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 248                                 goto cleanup;
 249                         }
 250                         skb_reserve(skb, NET_IP_ALIGN);
 251                         dma_addr = dma_map_single(greth->dev,
 252                                                   skb->data,
 253                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 254                                                   DMA_FROM_DEVICE);
 255
 256                         if (dma_mapping_error(greth->dev, dma_addr)) {
 257                                 if (netif_msg_ifup(greth))
 258                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 259                                 goto cleanup;
 260                         }
 261                         greth->rx_skbuff[i] = skb;
 262                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 263                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 264                 }
 265
 266         } else {
 267
 268                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 269                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 270
 271                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 272
 273                         if (greth->rx_bufs[i] == NULL) {
 274                                 if (netif_msg_ifup(greth))
 275                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 276                                 goto cleanup;
 277                         }
 278
 279                         dma_addr = dma_map_single(greth->dev,
 280                                                   greth->rx_bufs[i],
 281                                                   MAX_FRAME_SIZE,
 282                                                   DMA_FROM_DEVICE);
 283
 284                         if (dma_mapping_error(greth->dev, dma_addr)) {
 285                                 if (netif_msg_ifup(greth))
 286                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 287                                 goto cleanup;
 288                         }
 289                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 290                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 291                 }
 292                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 293
 294                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 295
 296                         if (greth->tx_bufs[i] == NULL) {
 297                                 if (netif_msg_ifup(greth))
 298                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 299                                 goto cleanup;
 300                         }
 301
 302                         dma_addr = dma_map_single(greth->dev,
 303                                                   greth->tx_bufs[i],
 304                                                   MAX_FRAME_SIZE,
 305                                                   DMA_TO_DEVICE);
 306
 307                         if (dma_mapping_error(greth->dev, dma_addr)) {
 308                                 if (netif_msg_ifup(greth))
 309                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 310                                 goto cleanup;
 311                         }
 312                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 313                         greth_write_bd(&tx_bd[i].stat, 0);
 314                 }
 315         }
 316         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 317                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 318
 319         /* Initialize pointers. */
 320         greth->rx_cur = 0;
 321         greth->tx_next = 0;
 322         greth->tx_last = 0;
 323         greth->tx_free = GRETH_TXBD_NUM;
 324
 325         /* Initialize descriptor base address */
 326         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 327         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 328
 329         return 0;
 330
 331 cleanup:
 332         greth_clean_rings(greth);
 333         return -ENOMEM;
 334 }
 335
 336 static int greth_open(struct net_device *dev)
 337 {
 338         struct greth_private *greth = netdev_priv(dev);
 339         int err;
 340
 341         err = greth_init_rings(greth);
 342         if (err) {
 343                 if (netif_msg_ifup(greth))
 344                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 345                 return err;
 346         }
 347
 348         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 349         if (err) {
 350                 if (netif_msg_ifup(greth))
 351                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 352                 greth_clean_rings(greth);
 353                 return err;
 354         }
 355
 356         if (netif_msg_ifup(greth))
 357                 dev_dbg(&dev->dev, " starting queue\n");
 358         netif_start_queue(dev);
 359
 360         GRETH_REGSAVE(greth->regs->status, 0xFF);
 361
 362         napi_enable(&greth->napi);
 363
 364         greth_enable_irqs(greth);
 365         greth_enable_tx(greth);
 366         greth_enable_rx(greth);
 367         return 0;
 368
 369 }
 370
 371 static int greth_close(struct net_device *dev)
 372 {
 373         struct greth_private *greth = netdev_priv(dev);
 374
 375         napi_disable(&greth->napi);
 376
 377         greth_disable_irqs(greth);
 378         greth_disable_tx(greth);
 379         greth_disable_rx(greth);
 380
 381         netif_stop_queue(dev);
 382
 383         free_irq(greth->irq, (void *) dev);
 384
 385         greth_clean_rings(greth);
 386
 387         return 0;
 388 }
 389
 390 static netdev_tx_t
 391 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 392 {
 393         struct greth_private *greth = netdev_priv(dev);
 394         struct greth_bd *bdp;
 395         int err = NETDEV_TX_OK;
 396         u32 status, dma_addr, ctrl;
 397         unsigned long flags;
 398
 399         /* Clean TX Ring */
 400         greth_clean_tx(greth->netdev);
 401
 402         if (unlikely(greth->tx_free <= 0)) {
 403                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 404                 ctrl = GRETH_REGLOAD(greth->regs->control);
 405                 /* Enable TX IRQ only if not already in poll() routine */
 406                 if (ctrl & GRETH_RXI)
 407                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 408                 netif_stop_queue(dev);
 409                 spin_unlock_irqrestore(&greth->devlock, flags);
 410                 return NETDEV_TX_BUSY;
 411         }
 412
 413         if (netif_msg_pktdata(greth))
 414                 greth_print_tx_packet(skb);
 415
 416
 417         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 418                 dev->stats.tx_errors++;
 419                 goto out;
 420         }
 421
 422         bdp = greth->tx_bd_base + greth->tx_next;
 423         dma_addr = greth_read_bd(&bdp->addr);
 424
 425         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 426
 427         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 428
 429         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 430
 431         /* Wrap around descriptor ring */
 432         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 433                 status |= GRETH_BD_WR;
 434         }
 435
 436         greth->tx_next = NEXT_TX(greth->tx_next);
 437         greth->tx_free--;
 438
 439         /* Write descriptor control word and enable transmission */
 440         greth_write_bd(&bdp->stat, status);
 441         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 442         greth_enable_tx(greth);
 443         spin_unlock_irqrestore(&greth->devlock, flags);
 444
 445 out:
 446         dev_kfree_skb(skb);
 447         return err;
 448 }
 449
 450
 451 static netdev_tx_t
 452 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 453 {
 454         struct greth_private *greth = netdev_priv(dev);
 455         struct greth_bd *bdp;
 456         u32 status = 0, dma_addr, ctrl;
 457         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 458         unsigned long flags;
 459
 460         nr_frags = skb_shinfo(skb)->nr_frags;
 461
 462         /* Clean TX Ring */
 463         greth_clean_tx_gbit(dev);
 464
 465         if (greth->tx_free < nr_frags + 1) {
 466                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 467                 ctrl = GRETH_REGLOAD(greth->regs->control);
 468                 /* Enable TX IRQ only if not already in poll() routine */
 469                 if (ctrl & GRETH_RXI)
 470                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 471                 netif_stop_queue(dev);
 472                 spin_unlock_irqrestore(&greth->devlock, flags);
 473                 err = NETDEV_TX_BUSY;
 474                 goto out;
 475         }
 476
 477         if (netif_msg_pktdata(greth))
 478                 greth_print_tx_packet(skb);
 479
 480         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 481                 dev->stats.tx_errors++;
 482                 goto out;
 483         }
 484
 485         /* Save skb pointer. */
 486         greth->tx_skbuff[greth->tx_next] = skb;
 487
 488         /* Linear buf */
 489         if (nr_frags != 0)
 490                 status = GRETH_TXBD_MORE;
 491
 492         status |= GRETH_TXBD_CSALL;
 493         status |= skb_headlen(skb) & GRETH_BD_LEN;
 494         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 495                 status |= GRETH_BD_WR;
 496
 497
 498         bdp = greth->tx_bd_base + greth->tx_next;
 499         greth_write_bd(&bdp->stat, status);
 500         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 501
 502         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 503                 goto map_error;
 504
 505         greth_write_bd(&bdp->addr, dma_addr);
 506
 507         curr_tx = NEXT_TX(greth->tx_next);
 508
 509         /* Frags */
 510         for (i = 0; i < nr_frags; i++) {
 511                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 512                 greth->tx_skbuff[curr_tx] = NULL;
 513                 bdp = greth->tx_bd_base + curr_tx;
 514
 515                 status = GRETH_TXBD_CSALL | GRETH_BD_EN;
 516                 status |= frag->size & GRETH_BD_LEN;
 517
 518                 /* Wrap around descriptor ring */
 519                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 520                         status |= GRETH_BD_WR;
 521
 522                 /* More fragments left */
 523                 if (i < nr_frags - 1)
 524                         status |= GRETH_TXBD_MORE;
 525                 else
 526                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 527
 528                 greth_write_bd(&bdp->stat, status);
 529
 530                 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, frag->size,
 531                                             DMA_TO_DEVICE);
 532
 533                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 534                         goto frag_map_error;
 535
 536                 greth_write_bd(&bdp->addr, dma_addr);
 537
 538                 curr_tx = NEXT_TX(curr_tx);
 539         }
 540
 541         wmb();
 542
 543         /* Enable the descriptor chain by enabling the first descriptor */
 544         bdp = greth->tx_bd_base + greth->tx_next;
 545         greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 546         greth->tx_next = curr_tx;
 547         greth->tx_free -= nr_frags + 1;
 548
 549         wmb();
 550
 551         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 552         greth_enable_tx(greth);
 553         spin_unlock_irqrestore(&greth->devlock, flags);
 554
 555         return NETDEV_TX_OK;
 556
 557 frag_map_error:
 558         /* Unmap SKB mappings that succeeded and disable descriptor */
 559         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 560                 bdp = greth->tx_bd_base + greth->tx_next + i;
 561                 dma_unmap_single(greth->dev,
 562                                  greth_read_bd(&bdp->addr),
 563                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 564                                  DMA_TO_DEVICE);
 565                 greth_write_bd(&bdp->stat, 0);
 566         }
 567 map_error:
 568         if (net_ratelimit())
 569                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 570         dev_kfree_skb(skb);
 571 out:
 572         return err;
 573 }
 574
 575 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 576 {
 577         struct net_device *dev = dev_id;
 578         struct greth_private *greth;
 579         u32 status, ctrl;
 580         irqreturn_t retval = IRQ_NONE;
 581
 582         greth = netdev_priv(dev);
 583
 584         spin_lock(&greth->devlock);
 585
 586         /* Get the interrupt events that caused us to be here. */
 587         status = GRETH_REGLOAD(greth->regs->status);
 588
 589         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 590          * set regardless of whether IRQ is enabled or not. Especially
 591          * important when shared IRQ.
 592          */
 593         ctrl = GRETH_REGLOAD(greth->regs->control);
 594
 595         /* Handle rx and tx interrupts through poll */
 596         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 597             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 598                 retval = IRQ_HANDLED;
 599
 600                 /* Disable interrupts and schedule poll() */
 601                 greth_disable_irqs(greth);
 602                 napi_schedule(&greth->napi);
 603         }
 604
 605         mmiowb();
 606         spin_unlock(&greth->devlock);
 607
 608         return retval;
 609 }
 610
 611 static void greth_clean_tx(struct net_device *dev)
 612 {
 613         struct greth_private *greth;
 614         struct greth_bd *bdp;
 615         u32 stat;
 616
 617         greth = netdev_priv(dev);
 618
 619         while (1) {
 620                 bdp = greth->tx_bd_base + greth->tx_last;
 621                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 622                 mb();
 623                 stat = greth_read_bd(&bdp->stat);
 624
 625                 if (unlikely(stat & GRETH_BD_EN))
 626                         break;
 627
 628                 if (greth->tx_free == GRETH_TXBD_NUM)
 629                         break;
 630
 631                 /* Check status for errors */
 632                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 633                         dev->stats.tx_errors++;
 634                         if (stat & GRETH_TXBD_ERR_AL)
 635                                 dev->stats.tx_aborted_errors++;
 636                         if (stat & GRETH_TXBD_ERR_UE)
 637                                 dev->stats.tx_fifo_errors++;
 638                 }
 639                 dev->stats.tx_packets++;
 640                 greth->tx_last = NEXT_TX(greth->tx_last);
 641                 greth->tx_free++;
 642         }
 643
 644         if (greth->tx_free > 0) {
 645                 netif_wake_queue(dev);
 646         }
 647
 648 }
 649
 650 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 651 {
 652         /* Check status for errors */
 653         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 654                 dev->stats.tx_errors++;
 655                 if (stat & GRETH_TXBD_ERR_AL)
 656                         dev->stats.tx_aborted_errors++;
 657                 if (stat & GRETH_TXBD_ERR_UE)
 658                         dev->stats.tx_fifo_errors++;
 659                 if (stat & GRETH_TXBD_ERR_LC)
 660                         dev->stats.tx_aborted_errors++;
 661         }
 662         dev->stats.tx_packets++;
 663 }
 664
 665 static void greth_clean_tx_gbit(struct net_device *dev)
 666 {
 667         struct greth_private *greth;
 668         struct greth_bd *bdp, *bdp_last_frag;
 669         struct sk_buff *skb;
 670         u32 stat;
 671         int nr_frags, i;
 672
 673         greth = netdev_priv(dev);
 674
 675         while (greth->tx_free < GRETH_TXBD_NUM) {
 676
 677                 skb = greth->tx_skbuff[greth->tx_last];
 678
 679                 nr_frags = skb_shinfo(skb)->nr_frags;
 680
 681                 /* We only clean fully completed SKBs */
 682                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
 683
 684                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 685                 mb();
 686                 stat = greth_read_bd(&bdp_last_frag->stat);
 687
 688                 if (stat & GRETH_BD_EN)
 689                         break;
 690
 691                 greth->tx_skbuff[greth->tx_last] = NULL;
 692
 693                 greth_update_tx_stats(dev, stat);
 694
 695                 bdp = greth->tx_bd_base + greth->tx_last;
 696
 697                 greth->tx_last = NEXT_TX(greth->tx_last);
 698
 699                 dma_unmap_single(greth->dev,
 700                                  greth_read_bd(&bdp->addr),
 701                                  skb_headlen(skb),
 702                                  DMA_TO_DEVICE);
 703
 704                 for (i = 0; i < nr_frags; i++) {
 705                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 706                         bdp = greth->tx_bd_base + greth->tx_last;
 707
 708                         dma_unmap_page(greth->dev,
 709                                        greth_read_bd(&bdp->addr),
 710                                        frag->size,
 711                                        DMA_TO_DEVICE);
 712
 713                         greth->tx_last = NEXT_TX(greth->tx_last);
 714                 }
 715                 greth->tx_free += nr_frags+1;
 716                 dev_kfree_skb(skb);
 717         }
 718
 719         if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
 720                 netif_wake_queue(dev);
 721 }
 722
 723 static int greth_rx(struct net_device *dev, int limit)
 724 {
 725         struct greth_private *greth;
 726         struct greth_bd *bdp;
 727         struct sk_buff *skb;
 728         int pkt_len;
 729         int bad, count;
 730         u32 status, dma_addr;
 731         unsigned long flags;
 732
 733         greth = netdev_priv(dev);
 734
 735         for (count = 0; count < limit; ++count) {
 736
 737                 bdp = greth->rx_bd_base + greth->rx_cur;
 738                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 739                 mb();
 740                 status = greth_read_bd(&bdp->stat);
 741
 742                 if (unlikely(status & GRETH_BD_EN)) {
 743                         break;
 744                 }
 745
 746                 dma_addr = greth_read_bd(&bdp->addr);
 747                 bad = 0;
 748
 749                 /* Check status for errors. */
 750                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 751                         if (status & GRETH_RXBD_ERR_FT) {
 752                                 dev->stats.rx_length_errors++;
 753                                 bad = 1;
 754                         }
 755                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 756                                 dev->stats.rx_frame_errors++;
 757                                 bad = 1;
 758                         }
 759                         if (status & GRETH_RXBD_ERR_CRC) {
 760                                 dev->stats.rx_crc_errors++;
 761                                 bad = 1;
 762                         }
 763                 }
 764                 if (unlikely(bad)) {
 765                         dev->stats.rx_errors++;
 766
 767                 } else {
 768
 769                         pkt_len = status & GRETH_BD_LEN;
 770
 771                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 772
 773                         if (unlikely(skb == NULL)) {
 774
 775                                 if (net_ratelimit())
 776                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 777
 778                                 dev->stats.rx_dropped++;
 779
 780                         } else {
 781                                 skb_reserve(skb, NET_IP_ALIGN);
 782                                 skb->dev = dev;
 783
 784                                 dma_sync_single_for_cpu(greth->dev,
 785                                                         dma_addr,
 786                                                         pkt_len,
 787                                                         DMA_FROM_DEVICE);
 788
 789                                 if (netif_msg_pktdata(greth))
 790                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 791
 792                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
 793
 794                                 skb->protocol = eth_type_trans(skb, dev);
 795                                 dev->stats.rx_packets++;
 796                                 netif_receive_skb(skb);
 797                         }
 798                 }
 799
 800                 status = GRETH_BD_EN | GRETH_BD_IE;
 801                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 802                         status |= GRETH_BD_WR;
 803                 }
 804
 805                 wmb();
 806                 greth_write_bd(&bdp->stat, status);
 807
 808                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 809
 810                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 811                 greth_enable_rx(greth);
 812                 spin_unlock_irqrestore(&greth->devlock, flags);
 813
 814                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 815         }
 816
 817         return count;
 818 }
 819
 820 static inline int hw_checksummed(u32 status)
 821 {
 822
 823         if (status & GRETH_RXBD_IP_FRAG)
 824                 return 0;
 825
 826         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 827                 return 0;
 828
 829         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 830                 return 0;
 831
 832         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 833                 return 0;
 834
 835         return 1;
 836 }
 837
 838 static int greth_rx_gbit(struct net_device *dev, int limit)
 839 {
 840         struct greth_private *greth;
 841         struct greth_bd *bdp;
 842         struct sk_buff *skb, *newskb;
 843         int pkt_len;
 844         int bad, count = 0;
 845         u32 status, dma_addr;
 846         unsigned long flags;
 847
 848         greth = netdev_priv(dev);
 849
 850         for (count = 0; count < limit; ++count) {
 851
 852                 bdp = greth->rx_bd_base + greth->rx_cur;
 853                 skb = greth->rx_skbuff[greth->rx_cur];
 854                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 855                 mb();
 856                 status = greth_read_bd(&bdp->stat);
 857                 bad = 0;
 858
 859                 if (status & GRETH_BD_EN)
 860                         break;
 861
 862                 /* Check status for errors. */
 863                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 864
 865                         if (status & GRETH_RXBD_ERR_FT) {
 866                                 dev->stats.rx_length_errors++;
 867                                 bad = 1;
 868                         } else if (status &
 869                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 870                                 dev->stats.rx_frame_errors++;
 871                                 bad = 1;
 872                         } else if (status & GRETH_RXBD_ERR_CRC) {
 873                                 dev->stats.rx_crc_errors++;
 874                                 bad = 1;
 875                         }
 876                 }
 877
 878                 /* Allocate new skb to replace current, not needed if the
 879                  * current skb can be reused */
 880                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 881                         skb_reserve(newskb, NET_IP_ALIGN);
 882
 883                         dma_addr = dma_map_single(greth->dev,
 884                                                       newskb->data,
 885                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 886                                                       DMA_FROM_DEVICE);
 887
 888                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 889                                 /* Process the incoming frame. */
 890                                 pkt_len = status & GRETH_BD_LEN;
 891
 892                                 dma_unmap_single(greth->dev,
 893                                                  greth_read_bd(&bdp->addr),
 894                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 895                                                  DMA_FROM_DEVICE);
 896
 897                                 if (netif_msg_pktdata(greth))
 898                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 899
 900                                 skb_put(skb, pkt_len);
 901
 902                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 903                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 904                                 else
 905                                         skb_checksum_none_assert(skb);
 906
 907                                 skb->protocol = eth_type_trans(skb, dev);
 908                                 dev->stats.rx_packets++;
 909                                 netif_receive_skb(skb);
 910
 911                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 912                                 greth_write_bd(&bdp->addr, dma_addr);
 913                         } else {
 914                                 if (net_ratelimit())
 915                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 916                                 dev_kfree_skb(newskb);
 917                                 /* reusing current skb, so it is a drop */
 918                                 dev->stats.rx_dropped++;
 919                         }
 920                 } else if (bad) {
 921                         /* Bad Frame transfer, the skb is reused */
 922                         dev->stats.rx_dropped++;
 923                 } else {
 924                         /* Failed Allocating a new skb. This is rather stupid
 925                          * but the current "filled" skb is reused, as if
 926                          * transfer failure. One could argue that RX descriptor
 927                          * table handling should be divided into cleaning and
 928                          * filling as the TX part of the driver
 929                          */
 930                         if (net_ratelimit())
 931                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 932                         /* reusing current skb, so it is a drop */
 933                         dev->stats.rx_dropped++;
 934                 }
 935
 936                 status = GRETH_BD_EN | GRETH_BD_IE;
 937                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 938                         status |= GRETH_BD_WR;
 939                 }
 940
 941                 wmb();
 942                 greth_write_bd(&bdp->stat, status);
 943                 spin_lock_irqsave(&greth->devlock, flags);
 944                 greth_enable_rx(greth);
 945                 spin_unlock_irqrestore(&greth->devlock, flags);
 946                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 947         }
 948
 949         return count;
 950
 951 }
 952
 953 static int greth_poll(struct napi_struct *napi, int budget)
 954 {
 955         struct greth_private *greth;
 956         int work_done = 0;
 957         unsigned long flags;
 958         u32 mask, ctrl;
 959         greth = container_of(napi, struct greth_private, napi);
 960
 961 restart_txrx_poll:
 962         if (netif_queue_stopped(greth->netdev)) {
 963                 if (greth->gbit_mac)
 964                         greth_clean_tx_gbit(greth->netdev);
 965                 else
 966                         greth_clean_tx(greth->netdev);
 967         }
 968
 969         if (greth->gbit_mac) {
 970                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 971         } else {
 972                 work_done += greth_rx(greth->netdev, budget - work_done);
 973         }
 974
 975         if (work_done < budget) {
 976
 977                 spin_lock_irqsave(&greth->devlock, flags);
 978
 979                 ctrl = GRETH_REGLOAD(greth->regs->control);
 980                 if (netif_queue_stopped(greth->netdev)) {
 981                         GRETH_REGSAVE(greth->regs->control,
 982                                         ctrl | GRETH_TXI | GRETH_RXI);
 983                         mask = GRETH_INT_RX | GRETH_INT_RE |
 984                                GRETH_INT_TX | GRETH_INT_TE;
 985                 } else {
 986                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
 987                         mask = GRETH_INT_RX | GRETH_INT_RE;
 988                 }
 989
 990                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
 991                         GRETH_REGSAVE(greth->regs->control, ctrl);
 992                         spin_unlock_irqrestore(&greth->devlock, flags);
 993                         goto restart_txrx_poll;
 994                 } else {
 995                         __napi_complete(napi);
 996                         spin_unlock_irqrestore(&greth->devlock, flags);
 997                 }
 998         }
 999
1000         return work_done;
1001 }
1002
1003 static int greth_set_mac_add(struct net_device *dev, void *p)
1004 {
1005         struct sockaddr *addr = p;
1006         struct greth_private *greth;
1007         struct greth_regs *regs;
1008
1009         greth = netdev_priv(dev);
1010         regs = (struct greth_regs *) greth->regs;
1011
1012         if (!is_valid_ether_addr(addr->sa_data))
1013                 return -EINVAL;
1014
1015         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1016         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1017         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1018                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1019
1020         return 0;
1021 }
1022
1023 static u32 greth_hash_get_index(__u8 *addr)
1024 {
1025         return (ether_crc(6, addr)) & 0x3F;
1026 }
1027
1028 static void greth_set_hash_filter(struct net_device *dev)
1029 {
1030         struct netdev_hw_addr *ha;
1031         struct greth_private *greth = netdev_priv(dev);
1032         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1033         u32 mc_filter[2];
1034         unsigned int bitnr;
1035
1036         mc_filter[0] = mc_filter[1] = 0;
1037
1038         netdev_for_each_mc_addr(ha, dev) {
1039                 bitnr = greth_hash_get_index(ha->addr);
1040                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1041         }
1042
1043         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1044         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1045 }
1046
1047 static void greth_set_multicast_list(struct net_device *dev)
1048 {
1049         int cfg;
1050         struct greth_private *greth = netdev_priv(dev);
1051         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1052
1053         cfg = GRETH_REGLOAD(regs->control);
1054         if (dev->flags & IFF_PROMISC)
1055                 cfg |= GRETH_CTRL_PR;
1056         else
1057                 cfg &= ~GRETH_CTRL_PR;
1058
1059         if (greth->multicast) {
1060                 if (dev->flags & IFF_ALLMULTI) {
1061                         GRETH_REGSAVE(regs->hash_msb, -1);
1062                         GRETH_REGSAVE(regs->hash_lsb, -1);
1063                         cfg |= GRETH_CTRL_MCEN;
1064                         GRETH_REGSAVE(regs->control, cfg);
1065                         return;
1066                 }
1067
1068                 if (netdev_mc_empty(dev)) {
1069                         cfg &= ~GRETH_CTRL_MCEN;
1070                         GRETH_REGSAVE(regs->control, cfg);
1071                         return;
1072                 }
1073
1074                 /* Setup multicast filter */
1075                 greth_set_hash_filter(dev);
1076                 cfg |= GRETH_CTRL_MCEN;
1077         }
1078         GRETH_REGSAVE(regs->control, cfg);
1079 }
1080
1081 static u32 greth_get_msglevel(struct net_device *dev)
1082 {
1083         struct greth_private *greth = netdev_priv(dev);
1084         return greth->msg_enable;
1085 }
1086
1087 static void greth_set_msglevel(struct net_device *dev, u32 value)
1088 {
1089         struct greth_private *greth = netdev_priv(dev);
1090         greth->msg_enable = value;
1091 }
1092 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1093 {
1094         struct greth_private *greth = netdev_priv(dev);
1095         struct phy_device *phy = greth->phy;
1096
1097         if (!phy)
1098                 return -ENODEV;
1099
1100         return phy_ethtool_gset(phy, cmd);
1101 }
1102
1103 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1104 {
1105         struct greth_private *greth = netdev_priv(dev);
1106         struct phy_device *phy = greth->phy;
1107
1108         if (!phy)
1109                 return -ENODEV;
1110
1111         return phy_ethtool_sset(phy, cmd);
1112 }
1113
1114 static int greth_get_regs_len(struct net_device *dev)
1115 {
1116         return sizeof(struct greth_regs);
1117 }
1118
1119 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1120 {
1121         struct greth_private *greth = netdev_priv(dev);
1122
1123         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1124         strncpy(info->version, "revision: 1.0", 32);
1125         strncpy(info->bus_info, greth->dev->bus->name, 32);
1126         strncpy(info->fw_version, "N/A", 32);
1127         info->eedump_len = 0;
1128         info->regdump_len = sizeof(struct greth_regs);
1129 }
1130
1131 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1132 {
1133         int i;
1134         struct greth_private *greth = netdev_priv(dev);
1135         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1136         u32 *buff = p;
1137
1138         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1139                 buff[i] = greth_read_bd(&greth_regs[i]);
1140 }
1141
1142 static const struct ethtool_ops greth_ethtool_ops = {
1143         .get_msglevel           = greth_get_msglevel,
1144         .set_msglevel           = greth_set_msglevel,
1145         .get_settings           = greth_get_settings,
1146         .set_settings           = greth_set_settings,
1147         .get_drvinfo            = greth_get_drvinfo,
1148         .get_regs_len           = greth_get_regs_len,
1149         .get_regs               = greth_get_regs,
1150         .get_link               = ethtool_op_get_link,
1151 };
1152
1153 static struct net_device_ops greth_netdev_ops = {
1154         .ndo_open               = greth_open,
1155         .ndo_stop               = greth_close,
1156         .ndo_start_xmit         = greth_start_xmit,
1157         .ndo_set_mac_address    = greth_set_mac_add,
1158         .ndo_validate_addr      = eth_validate_addr,
1159 };
1160
1161 static inline int wait_for_mdio(struct greth_private *greth)
1162 {
1163         unsigned long timeout = jiffies + 4*HZ/100;
1164         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1165                 if (time_after(jiffies, timeout))
1166                         return 0;
1167         }
1168         return 1;
1169 }
1170
1171 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1172 {
1173         struct greth_private *greth = bus->priv;
1174         int data;
1175
1176         if (!wait_for_mdio(greth))
1177                 return -EBUSY;
1178
1179         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1180
1181         if (!wait_for_mdio(greth))
1182                 return -EBUSY;
1183
1184         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1185                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1186                 return data;
1187
1188         } else {
1189                 return -1;
1190         }
1191 }
1192
1193 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1194 {
1195         struct greth_private *greth = bus->priv;
1196
1197         if (!wait_for_mdio(greth))
1198                 return -EBUSY;
1199
1200         GRETH_REGSAVE(greth->regs->mdio,
1201                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1202
1203         if (!wait_for_mdio(greth))
1204                 return -EBUSY;
1205
1206         return 0;
1207 }
1208
1209 static int greth_mdio_reset(struct mii_bus *bus)
1210 {
1211         return 0;
1212 }
1213
1214 static void greth_link_change(struct net_device *dev)
1215 {
1216         struct greth_private *greth = netdev_priv(dev);
1217         struct phy_device *phydev = greth->phy;
1218         unsigned long flags;
1219         int status_change = 0;
1220         u32 ctrl;
1221
1222         spin_lock_irqsave(&greth->devlock, flags);
1223
1224         if (phydev->link) {
1225
1226                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1227                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1228                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1229
1230                         if (phydev->duplex)
1231                                 ctrl |= GRETH_CTRL_FD;
1232
1233                         if (phydev->speed == SPEED_100)
1234                                 ctrl |= GRETH_CTRL_SP;
1235                         else if (phydev->speed == SPEED_1000)
1236                                 ctrl |= GRETH_CTRL_GB;
1237
1238                         GRETH_REGSAVE(greth->regs->control, ctrl);
1239                         greth->speed = phydev->speed;
1240                         greth->duplex = phydev->duplex;
1241                         status_change = 1;
1242                 }
1243         }
1244
1245         if (phydev->link != greth->link) {
1246                 if (!phydev->link) {
1247                         greth->speed = 0;
1248                         greth->duplex = -1;
1249                 }
1250                 greth->link = phydev->link;
1251
1252                 status_change = 1;
1253         }
1254
1255         spin_unlock_irqrestore(&greth->devlock, flags);
1256
1257         if (status_change) {
1258                 if (phydev->link)
1259                         pr_debug("%s: link up (%d/%s)\n",
1260                                 dev->name, phydev->speed,
1261                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1262                 else
1263                         pr_debug("%s: link down\n", dev->name);
1264         }
1265 }
1266
1267 static int greth_mdio_probe(struct net_device *dev)
1268 {
1269         struct greth_private *greth = netdev_priv(dev);
1270         struct phy_device *phy = NULL;
1271         int ret;
1272
1273         /* Find the first PHY */
1274         phy = phy_find_first(greth->mdio);
1275
1276         if (!phy) {
1277                 if (netif_msg_probe(greth))
1278                         dev_err(&dev->dev, "no PHY found\n");
1279                 return -ENXIO;
1280         }
1281
1282         ret = phy_connect_direct(dev, phy, &greth_link_change,
1283                         0, greth->gbit_mac ?
1284                         PHY_INTERFACE_MODE_GMII :
1285                         PHY_INTERFACE_MODE_MII);
1286         if (ret) {
1287                 if (netif_msg_ifup(greth))
1288                         dev_err(&dev->dev, "could not attach to PHY\n");
1289                 return ret;
1290         }
1291
1292         if (greth->gbit_mac)
1293                 phy->supported &= PHY_GBIT_FEATURES;
1294         else
1295                 phy->supported &= PHY_BASIC_FEATURES;
1296
1297         phy->advertising = phy->supported;
1298
1299         greth->link = 0;
1300         greth->speed = 0;
1301         greth->duplex = -1;
1302         greth->phy = phy;
1303
1304         return 0;
1305 }
1306
1307 static inline int phy_aneg_done(struct phy_device *phydev)
1308 {
1309         int retval;
1310
1311         retval = phy_read(phydev, MII_BMSR);
1312
1313         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1314 }
1315
1316 static int greth_mdio_init(struct greth_private *greth)
1317 {
1318         int ret, phy;
1319         unsigned long timeout;
1320
1321         greth->mdio = mdiobus_alloc();
1322         if (!greth->mdio) {
1323                 return -ENOMEM;
1324         }
1325
1326         greth->mdio->name = "greth-mdio";
1327         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1328         greth->mdio->read = greth_mdio_read;
1329         greth->mdio->write = greth_mdio_write;
1330         greth->mdio->reset = greth_mdio_reset;
1331         greth->mdio->priv = greth;
1332
1333         greth->mdio->irq = greth->mdio_irqs;
1334
1335         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1336                 greth->mdio->irq[phy] = PHY_POLL;
1337
1338         ret = mdiobus_register(greth->mdio);
1339         if (ret) {
1340                 goto error;
1341         }
1342
1343         ret = greth_mdio_probe(greth->netdev);
1344         if (ret) {
1345                 if (netif_msg_probe(greth))
1346                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1347                 goto unreg_mdio;
1348         }
1349
1350         phy_start(greth->phy);
1351
1352         /* If Ethernet debug link is used make autoneg happen right away */
1353         if (greth->edcl && greth_edcl == 1) {
1354                 phy_start_aneg(greth->phy);
1355                 timeout = jiffies + 6*HZ;
1356                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1357                 }
1358                 genphy_read_status(greth->phy);
1359                 greth_link_change(greth->netdev);
1360         }
1361
1362         return 0;
1363
1364 unreg_mdio:
1365         mdiobus_unregister(greth->mdio);
1366 error:
1367         mdiobus_free(greth->mdio);
1368         return ret;
1369 }
1370
1371 /* Initialize the GRETH MAC */
1372 static int __devinit greth_of_probe(struct platform_device *ofdev)
1373 {
1374         struct net_device *dev;
1375         struct greth_private *greth;
1376         struct greth_regs *regs;
1377
1378         int i;
1379         int err;
1380         int tmp;
1381         unsigned long timeout;
1382
1383         dev = alloc_etherdev(sizeof(struct greth_private));
1384
1385         if (dev == NULL)
1386                 return -ENOMEM;
1387
1388         greth = netdev_priv(dev);
1389         greth->netdev = dev;
1390         greth->dev = &ofdev->dev;
1391
1392         if (greth_debug > 0)
1393                 greth->msg_enable = greth_debug;
1394         else
1395                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1396
1397         spin_lock_init(&greth->devlock);
1398
1399         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1400                                  resource_size(&ofdev->resource[0]),
1401                                  "grlib-greth regs");
1402
1403         if (greth->regs == NULL) {
1404                 if (netif_msg_probe(greth))
1405                         dev_err(greth->dev, "ioremap failure.\n");
1406                 err = -EIO;
1407                 goto error1;
1408         }
1409
1410         regs = (struct greth_regs *) greth->regs;
1411         greth->irq = ofdev->archdata.irqs[0];
1412
1413         dev_set_drvdata(greth->dev, dev);
1414         SET_NETDEV_DEV(dev, greth->dev);
1415
1416         if (netif_msg_probe(greth))
1417                 dev_dbg(greth->dev, "reseting controller.\n");
1418
1419         /* Reset the controller. */
1420         GRETH_REGSAVE(regs->control, GRETH_RESET);
1421
1422         /* Wait for MAC to reset itself */
1423         timeout = jiffies + HZ/100;
1424         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1425                 if (time_after(jiffies, timeout)) {
1426                         err = -EIO;
1427                         if (netif_msg_probe(greth))
1428                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1429                         goto error2;
1430                 }
1431         }
1432
1433         /* Get default PHY address  */
1434         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1435
1436         /* Check if we have GBIT capable MAC */
1437         tmp = GRETH_REGLOAD(regs->control);
1438         greth->gbit_mac = (tmp >> 27) & 1;
1439
1440         /* Check for multicast capability */
1441         greth->multicast = (tmp >> 25) & 1;
1442
1443         greth->edcl = (tmp >> 31) & 1;
1444
1445         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1446          * it doesn't interfere with the software */
1447         if (greth->edcl != 0)
1448                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1449
1450         /* Check if MAC can handle MDIO interrupts */
1451         greth->mdio_int_en = (tmp >> 26) & 1;
1452
1453         err = greth_mdio_init(greth);
1454         if (err) {
1455                 if (netif_msg_probe(greth))
1456                         dev_err(greth->dev, "failed to register MDIO bus\n");
1457                 goto error2;
1458         }
1459
1460         /* Allocate TX descriptor ring in coherent memory */
1461         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1462                                                                    1024,
1463                                                                    &greth->tx_bd_base_phys,
1464                                                                    GFP_KERNEL);
1465
1466         if (!greth->tx_bd_base) {
1467                 if (netif_msg_probe(greth))
1468                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1469                 err = -ENOMEM;
1470                 goto error3;
1471         }
1472
1473         memset(greth->tx_bd_base, 0, 1024);
1474
1475         /* Allocate RX descriptor ring in coherent memory */
1476         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1477                                                                    1024,
1478                                                                    &greth->rx_bd_base_phys,
1479                                                                    GFP_KERNEL);
1480
1481         if (!greth->rx_bd_base) {
1482                 if (netif_msg_probe(greth))
1483                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1484                 err = -ENOMEM;
1485                 goto error4;
1486         }
1487
1488         memset(greth->rx_bd_base, 0, 1024);
1489
1490         /* Get MAC address from: module param, OF property or ID prom */
1491         for (i = 0; i < 6; i++) {
1492                 if (macaddr[i] != 0)
1493                         break;
1494         }
1495         if (i == 6) {
1496                 const unsigned char *addr;
1497                 int len;
1498                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1499                                         &len);
1500                 if (addr != NULL && len == 6) {
1501                         for (i = 0; i < 6; i++)
1502                                 macaddr[i] = (unsigned int) addr[i];
1503                 } else {
1504 #ifdef CONFIG_SPARC
1505                         for (i = 0; i < 6; i++)
1506                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1507 #endif
1508                 }
1509         }
1510
1511         for (i = 0; i < 6; i++)
1512                 dev->dev_addr[i] = macaddr[i];
1513
1514         macaddr[5]++;
1515
1516         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1517                 if (netif_msg_probe(greth))
1518                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1519                 err = -EINVAL;
1520                 goto error5;
1521         }
1522
1523         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1524         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1525                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1526
1527         /* Clear all pending interrupts except PHY irq */
1528         GRETH_REGSAVE(regs->status, 0xFF);
1529
1530         if (greth->gbit_mac) {
1531                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1532                         NETIF_F_RXCSUM;
1533                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1534                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1535         }
1536
1537         if (greth->multicast) {
1538                 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1539                 dev->flags |= IFF_MULTICAST;
1540         } else {
1541                 dev->flags &= ~IFF_MULTICAST;
1542         }
1543
1544         dev->netdev_ops = &greth_netdev_ops;
1545         dev->ethtool_ops = &greth_ethtool_ops;
1546
1547         err = register_netdev(dev);
1548         if (err) {
1549                 if (netif_msg_probe(greth))
1550                         dev_err(greth->dev, "netdevice registration failed.\n");
1551                 goto error5;
1552         }
1553
1554         /* setup NAPI */
1555         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1556
1557         return 0;
1558
1559 error5:
1560         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1561 error4:
1562         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1563 error3:
1564         mdiobus_unregister(greth->mdio);
1565 error2:
1566         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1567 error1:
1568         free_netdev(dev);
1569         return err;
1570 }
1571
1572 static int __devexit greth_of_remove(struct platform_device *of_dev)
1573 {
1574         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1575         struct greth_private *greth = netdev_priv(ndev);
1576
1577         /* Free descriptor areas */
1578         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1579
1580         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1581
1582         dev_set_drvdata(&of_dev->dev, NULL);
1583
1584         if (greth->phy)
1585                 phy_stop(greth->phy);
1586         mdiobus_unregister(greth->mdio);
1587
1588         unregister_netdev(ndev);
1589         free_netdev(ndev);
1590
1591         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1592
1593         return 0;
1594 }
1595
1596 static struct of_device_id greth_of_match[] = {
1597         {
1598          .name = "GAISLER_ETHMAC",
1599          },
1600         {
1601          .name = "01_01d",
1602          },
1603         {},
1604 };
1605
1606 MODULE_DEVICE_TABLE(of, greth_of_match);
1607
1608 static struct platform_driver greth_of_driver = {
1609         .driver = {
1610                 .name = "grlib-greth",
1611                 .owner = THIS_MODULE,
1612                 .of_match_table = greth_of_match,
1613         },
1614         .probe = greth_of_probe,
1615         .remove = __devexit_p(greth_of_remove),
1616 };
1617
1618 static int __init greth_init(void)
1619 {
1620         return platform_driver_register(&greth_of_driver);
1621 }
1622
1623 static void __exit greth_cleanup(void)
1624 {
1625         platform_driver_unregister(&greth_of_driver);
1626 }
1627
1628 module_init(greth_init);
1629 module_exit(greth_cleanup);
1630
1631 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1632 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1633 MODULE_LICENSE("GPL");