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/interrupt.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/io.h>
  34 #include <linux/crc32.h>
  35 #include <linux/mii.h>
  36 #include <linux/of_device.h>
  37 #include <linux/of_net.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_enable_tx_and_irq(struct greth_private *greth)
 128 {
 129         wmb(); /* BDs must been written to memory before enabling TX */
 130         GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
 131 }
 132
 133 static inline void greth_disable_tx(struct greth_private *greth)
 134 {
 135         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 136 }
 137
 138 static inline void greth_enable_rx(struct greth_private *greth)
 139 {
 140         wmb();
 141         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 142 }
 143
 144 static inline void greth_disable_rx(struct greth_private *greth)
 145 {
 146         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 147 }
 148
 149 static inline void greth_enable_irqs(struct greth_private *greth)
 150 {
 151         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 152 }
 153
 154 static inline void greth_disable_irqs(struct greth_private *greth)
 155 {
 156         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 157 }
 158
 159 static inline void greth_write_bd(u32 *bd, u32 val)
 160 {
 161         __raw_writel(cpu_to_be32(val), bd);
 162 }
 163
 164 static inline u32 greth_read_bd(u32 *bd)
 165 {
 166         return be32_to_cpu(__raw_readl(bd));
 167 }
 168
 169 static void greth_clean_rings(struct greth_private *greth)
 170 {
 171         int i;
 172         struct greth_bd *rx_bdp = greth->rx_bd_base;
 173         struct greth_bd *tx_bdp = greth->tx_bd_base;
 174
 175         if (greth->gbit_mac) {
 176
 177                 /* Free and unmap RX buffers */
 178                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 179                         if (greth->rx_skbuff[i] != NULL) {
 180                                 dev_kfree_skb(greth->rx_skbuff[i]);
 181                                 dma_unmap_single(greth->dev,
 182                                                  greth_read_bd(&rx_bdp->addr),
 183                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 184                                                  DMA_FROM_DEVICE);
 185                         }
 186                 }
 187
 188                 /* TX buffers */
 189                 while (greth->tx_free < GRETH_TXBD_NUM) {
 190
 191                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 192                         int nr_frags = skb_shinfo(skb)->nr_frags;
 193                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 194                         greth->tx_last = NEXT_TX(greth->tx_last);
 195
 196                         dma_unmap_single(greth->dev,
 197                                          greth_read_bd(&tx_bdp->addr),
 198                                          skb_headlen(skb),
 199                                          DMA_TO_DEVICE);
 200
 201                         for (i = 0; i < nr_frags; i++) {
 202                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 203                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 204
 205                                 dma_unmap_page(greth->dev,
 206                                                greth_read_bd(&tx_bdp->addr),
 207                                                skb_frag_size(frag),
 208                                                DMA_TO_DEVICE);
 209
 210                                 greth->tx_last = NEXT_TX(greth->tx_last);
 211                         }
 212                         greth->tx_free += nr_frags+1;
 213                         dev_kfree_skb(skb);
 214                 }
 215
 216
 217         } else { /* 10/100 Mbps MAC */
 218
 219                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 220                         kfree(greth->rx_bufs[i]);
 221                         dma_unmap_single(greth->dev,
 222                                          greth_read_bd(&rx_bdp->addr),
 223                                          MAX_FRAME_SIZE,
 224                                          DMA_FROM_DEVICE);
 225                 }
 226                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 227                         kfree(greth->tx_bufs[i]);
 228                         dma_unmap_single(greth->dev,
 229                                          greth_read_bd(&tx_bdp->addr),
 230                                          MAX_FRAME_SIZE,
 231                                          DMA_TO_DEVICE);
 232                 }
 233         }
 234 }
 235
 236 static int greth_init_rings(struct greth_private *greth)
 237 {
 238         struct sk_buff *skb;
 239         struct greth_bd *rx_bd, *tx_bd;
 240         u32 dma_addr;
 241         int i;
 242
 243         rx_bd = greth->rx_bd_base;
 244         tx_bd = greth->tx_bd_base;
 245
 246         /* Initialize descriptor rings and buffers */
 247         if (greth->gbit_mac) {
 248
 249                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 250                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 251                         if (skb == NULL) {
 252                                 if (netif_msg_ifup(greth))
 253                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 254                                 goto cleanup;
 255                         }
 256                         skb_reserve(skb, NET_IP_ALIGN);
 257                         dma_addr = dma_map_single(greth->dev,
 258                                                   skb->data,
 259                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 260                                                   DMA_FROM_DEVICE);
 261
 262                         if (dma_mapping_error(greth->dev, dma_addr)) {
 263                                 if (netif_msg_ifup(greth))
 264                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 265                                 goto cleanup;
 266                         }
 267                         greth->rx_skbuff[i] = skb;
 268                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 269                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 270                 }
 271
 272         } else {
 273
 274                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 275                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 276
 277                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 278
 279                         if (greth->rx_bufs[i] == NULL) {
 280                                 if (netif_msg_ifup(greth))
 281                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 282                                 goto cleanup;
 283                         }
 284
 285                         dma_addr = dma_map_single(greth->dev,
 286                                                   greth->rx_bufs[i],
 287                                                   MAX_FRAME_SIZE,
 288                                                   DMA_FROM_DEVICE);
 289
 290                         if (dma_mapping_error(greth->dev, dma_addr)) {
 291                                 if (netif_msg_ifup(greth))
 292                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 293                                 goto cleanup;
 294                         }
 295                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 296                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 297                 }
 298                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 299
 300                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 301
 302                         if (greth->tx_bufs[i] == NULL) {
 303                                 if (netif_msg_ifup(greth))
 304                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 305                                 goto cleanup;
 306                         }
 307
 308                         dma_addr = dma_map_single(greth->dev,
 309                                                   greth->tx_bufs[i],
 310                                                   MAX_FRAME_SIZE,
 311                                                   DMA_TO_DEVICE);
 312
 313                         if (dma_mapping_error(greth->dev, dma_addr)) {
 314                                 if (netif_msg_ifup(greth))
 315                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 316                                 goto cleanup;
 317                         }
 318                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 319                         greth_write_bd(&tx_bd[i].stat, 0);
 320                 }
 321         }
 322         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 323                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 324
 325         /* Initialize pointers. */
 326         greth->rx_cur = 0;
 327         greth->tx_next = 0;
 328         greth->tx_last = 0;
 329         greth->tx_free = GRETH_TXBD_NUM;
 330
 331         /* Initialize descriptor base address */
 332         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 333         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 334
 335         return 0;
 336
 337 cleanup:
 338         greth_clean_rings(greth);
 339         return -ENOMEM;
 340 }
 341
 342 static int greth_open(struct net_device *dev)
 343 {
 344         struct greth_private *greth = netdev_priv(dev);
 345         int err;
 346
 347         err = greth_init_rings(greth);
 348         if (err) {
 349                 if (netif_msg_ifup(greth))
 350                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 351                 return err;
 352         }
 353
 354         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 355         if (err) {
 356                 if (netif_msg_ifup(greth))
 357                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 358                 greth_clean_rings(greth);
 359                 return err;
 360         }
 361
 362         if (netif_msg_ifup(greth))
 363                 dev_dbg(&dev->dev, " starting queue\n");
 364         netif_start_queue(dev);
 365
 366         GRETH_REGSAVE(greth->regs->status, 0xFF);
 367
 368         napi_enable(&greth->napi);
 369
 370         greth_enable_irqs(greth);
 371         greth_enable_tx(greth);
 372         greth_enable_rx(greth);
 373         return 0;
 374
 375 }
 376
 377 static int greth_close(struct net_device *dev)
 378 {
 379         struct greth_private *greth = netdev_priv(dev);
 380
 381         napi_disable(&greth->napi);
 382
 383         greth_disable_irqs(greth);
 384         greth_disable_tx(greth);
 385         greth_disable_rx(greth);
 386
 387         netif_stop_queue(dev);
 388
 389         free_irq(greth->irq, (void *) dev);
 390
 391         greth_clean_rings(greth);
 392
 393         return 0;
 394 }
 395
 396 static netdev_tx_t
 397 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 398 {
 399         struct greth_private *greth = netdev_priv(dev);
 400         struct greth_bd *bdp;
 401         int err = NETDEV_TX_OK;
 402         u32 status, dma_addr, ctrl;
 403         unsigned long flags;
 404
 405         /* Clean TX Ring */
 406         greth_clean_tx(greth->netdev);
 407
 408         if (unlikely(greth->tx_free <= 0)) {
 409                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 410                 ctrl = GRETH_REGLOAD(greth->regs->control);
 411                 /* Enable TX IRQ only if not already in poll() routine */
 412                 if (ctrl & GRETH_RXI)
 413                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 414                 netif_stop_queue(dev);
 415                 spin_unlock_irqrestore(&greth->devlock, flags);
 416                 return NETDEV_TX_BUSY;
 417         }
 418
 419         if (netif_msg_pktdata(greth))
 420                 greth_print_tx_packet(skb);
 421
 422
 423         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 424                 dev->stats.tx_errors++;
 425                 goto out;
 426         }
 427
 428         bdp = greth->tx_bd_base + greth->tx_next;
 429         dma_addr = greth_read_bd(&bdp->addr);
 430
 431         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 432
 433         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 434
 435         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 436         greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
 437
 438         /* Wrap around descriptor ring */
 439         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 440                 status |= GRETH_BD_WR;
 441         }
 442
 443         greth->tx_next = NEXT_TX(greth->tx_next);
 444         greth->tx_free--;
 445
 446         /* Write descriptor control word and enable transmission */
 447         greth_write_bd(&bdp->stat, status);
 448         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 449         greth_enable_tx(greth);
 450         spin_unlock_irqrestore(&greth->devlock, flags);
 451
 452 out:
 453         dev_kfree_skb(skb);
 454         return err;
 455 }
 456
 457 static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
 458 {
 459         if (tx_next < tx_last)
 460                 return (tx_last - tx_next) - 1;
 461         else
 462                 return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
 463 }
 464
 465 static netdev_tx_t
 466 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 467 {
 468         struct greth_private *greth = netdev_priv(dev);
 469         struct greth_bd *bdp;
 470         u32 status, dma_addr;
 471         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 472         unsigned long flags;
 473         u16 tx_last;
 474
 475         nr_frags = skb_shinfo(skb)->nr_frags;
 476         tx_last = greth->tx_last;
 477         rmb(); /* tx_last is updated by the poll task */
 478
 479         if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
 480                 netif_stop_queue(dev);
 481                 err = NETDEV_TX_BUSY;
 482                 goto out;
 483         }
 484
 485         if (netif_msg_pktdata(greth))
 486                 greth_print_tx_packet(skb);
 487
 488         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 489                 dev->stats.tx_errors++;
 490                 goto out;
 491         }
 492
 493         /* Save skb pointer. */
 494         greth->tx_skbuff[greth->tx_next] = skb;
 495
 496         /* Linear buf */
 497         if (nr_frags != 0)
 498                 status = GRETH_TXBD_MORE;
 499         else
 500                 status = GRETH_BD_IE;
 501
 502         if (skb->ip_summed == CHECKSUM_PARTIAL)
 503                 status |= GRETH_TXBD_CSALL;
 504         status |= skb_headlen(skb) & GRETH_BD_LEN;
 505         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 506                 status |= GRETH_BD_WR;
 507
 508
 509         bdp = greth->tx_bd_base + greth->tx_next;
 510         greth_write_bd(&bdp->stat, status);
 511         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 512
 513         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 514                 goto map_error;
 515
 516         greth_write_bd(&bdp->addr, dma_addr);
 517
 518         curr_tx = NEXT_TX(greth->tx_next);
 519
 520         /* Frags */
 521         for (i = 0; i < nr_frags; i++) {
 522                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 523                 greth->tx_skbuff[curr_tx] = NULL;
 524                 bdp = greth->tx_bd_base + curr_tx;
 525
 526                 status = GRETH_BD_EN;
 527                 if (skb->ip_summed == CHECKSUM_PARTIAL)
 528                         status |= GRETH_TXBD_CSALL;
 529                 status |= skb_frag_size(frag) & GRETH_BD_LEN;
 530
 531                 /* Wrap around descriptor ring */
 532                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 533                         status |= GRETH_BD_WR;
 534
 535                 /* More fragments left */
 536                 if (i < nr_frags - 1)
 537                         status |= GRETH_TXBD_MORE;
 538                 else
 539                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 540
 541                 greth_write_bd(&bdp->stat, status);
 542
 543                 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
 544                                             DMA_TO_DEVICE);
 545
 546                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 547                         goto frag_map_error;
 548
 549                 greth_write_bd(&bdp->addr, dma_addr);
 550
 551                 curr_tx = NEXT_TX(curr_tx);
 552         }
 553
 554         wmb();
 555
 556         /* Enable the descriptor chain by enabling the first descriptor */
 557         bdp = greth->tx_bd_base + greth->tx_next;
 558         greth_write_bd(&bdp->stat,
 559                        greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 560
 561         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 562         greth->tx_next = curr_tx;
 563         greth_enable_tx_and_irq(greth);
 564         spin_unlock_irqrestore(&greth->devlock, flags);
 565
 566         return NETDEV_TX_OK;
 567
 568 frag_map_error:
 569         /* Unmap SKB mappings that succeeded and disable descriptor */
 570         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 571                 bdp = greth->tx_bd_base + greth->tx_next + i;
 572                 dma_unmap_single(greth->dev,
 573                                  greth_read_bd(&bdp->addr),
 574                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 575                                  DMA_TO_DEVICE);
 576                 greth_write_bd(&bdp->stat, 0);
 577         }
 578 map_error:
 579         if (net_ratelimit())
 580                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 581         dev_kfree_skb(skb);
 582 out:
 583         return err;
 584 }
 585
 586 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 587 {
 588         struct net_device *dev = dev_id;
 589         struct greth_private *greth;
 590         u32 status, ctrl;
 591         irqreturn_t retval = IRQ_NONE;
 592
 593         greth = netdev_priv(dev);
 594
 595         spin_lock(&greth->devlock);
 596
 597         /* Get the interrupt events that caused us to be here. */
 598         status = GRETH_REGLOAD(greth->regs->status);
 599
 600         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 601          * set regardless of whether IRQ is enabled or not. Especially
 602          * important when shared IRQ.
 603          */
 604         ctrl = GRETH_REGLOAD(greth->regs->control);
 605
 606         /* Handle rx and tx interrupts through poll */
 607         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 608             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 609                 retval = IRQ_HANDLED;
 610
 611                 /* Disable interrupts and schedule poll() */
 612                 greth_disable_irqs(greth);
 613                 napi_schedule(&greth->napi);
 614         }
 615
 616         mmiowb();
 617         spin_unlock(&greth->devlock);
 618
 619         return retval;
 620 }
 621
 622 static void greth_clean_tx(struct net_device *dev)
 623 {
 624         struct greth_private *greth;
 625         struct greth_bd *bdp;
 626         u32 stat;
 627
 628         greth = netdev_priv(dev);
 629
 630         while (1) {
 631                 bdp = greth->tx_bd_base + greth->tx_last;
 632                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 633                 mb();
 634                 stat = greth_read_bd(&bdp->stat);
 635
 636                 if (unlikely(stat & GRETH_BD_EN))
 637                         break;
 638
 639                 if (greth->tx_free == GRETH_TXBD_NUM)
 640                         break;
 641
 642                 /* Check status for errors */
 643                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 644                         dev->stats.tx_errors++;
 645                         if (stat & GRETH_TXBD_ERR_AL)
 646                                 dev->stats.tx_aborted_errors++;
 647                         if (stat & GRETH_TXBD_ERR_UE)
 648                                 dev->stats.tx_fifo_errors++;
 649                 }
 650                 dev->stats.tx_packets++;
 651                 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
 652                 greth->tx_last = NEXT_TX(greth->tx_last);
 653                 greth->tx_free++;
 654         }
 655
 656         if (greth->tx_free > 0) {
 657                 netif_wake_queue(dev);
 658         }
 659 }
 660
 661 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 662 {
 663         /* Check status for errors */
 664         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 665                 dev->stats.tx_errors++;
 666                 if (stat & GRETH_TXBD_ERR_AL)
 667                         dev->stats.tx_aborted_errors++;
 668                 if (stat & GRETH_TXBD_ERR_UE)
 669                         dev->stats.tx_fifo_errors++;
 670                 if (stat & GRETH_TXBD_ERR_LC)
 671                         dev->stats.tx_aborted_errors++;
 672         }
 673         dev->stats.tx_packets++;
 674 }
 675
 676 static void greth_clean_tx_gbit(struct net_device *dev)
 677 {
 678         struct greth_private *greth;
 679         struct greth_bd *bdp, *bdp_last_frag;
 680         struct sk_buff *skb = NULL;
 681         u32 stat;
 682         int nr_frags, i;
 683         u16 tx_last;
 684
 685         greth = netdev_priv(dev);
 686         tx_last = greth->tx_last;
 687
 688         while (tx_last != greth->tx_next) {
 689
 690                 skb = greth->tx_skbuff[tx_last];
 691
 692                 nr_frags = skb_shinfo(skb)->nr_frags;
 693
 694                 /* We only clean fully completed SKBs */
 695                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
 696
 697                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 698                 mb();
 699                 stat = greth_read_bd(&bdp_last_frag->stat);
 700
 701                 if (stat & GRETH_BD_EN)
 702                         break;
 703
 704                 greth->tx_skbuff[tx_last] = NULL;
 705
 706                 greth_update_tx_stats(dev, stat);
 707                 dev->stats.tx_bytes += skb->len;
 708
 709                 bdp = greth->tx_bd_base + tx_last;
 710
 711                 tx_last = NEXT_TX(tx_last);
 712
 713                 dma_unmap_single(greth->dev,
 714                                  greth_read_bd(&bdp->addr),
 715                                  skb_headlen(skb),
 716                                  DMA_TO_DEVICE);
 717
 718                 for (i = 0; i < nr_frags; i++) {
 719                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 720                         bdp = greth->tx_bd_base + tx_last;
 721
 722                         dma_unmap_page(greth->dev,
 723                                        greth_read_bd(&bdp->addr),
 724                                        skb_frag_size(frag),
 725                                        DMA_TO_DEVICE);
 726
 727                         tx_last = NEXT_TX(tx_last);
 728                 }
 729                 dev_kfree_skb(skb);
 730         }
 731         if (skb) { /* skb is set only if the above while loop was entered */
 732                 wmb();
 733                 greth->tx_last = tx_last;
 734
 735                 if (netif_queue_stopped(dev) &&
 736                     (greth_num_free_bds(tx_last, greth->tx_next) >
 737                     (MAX_SKB_FRAGS+1)))
 738                         netif_wake_queue(dev);
 739         }
 740 }
 741
 742 static int greth_rx(struct net_device *dev, int limit)
 743 {
 744         struct greth_private *greth;
 745         struct greth_bd *bdp;
 746         struct sk_buff *skb;
 747         int pkt_len;
 748         int bad, count;
 749         u32 status, dma_addr;
 750         unsigned long flags;
 751
 752         greth = netdev_priv(dev);
 753
 754         for (count = 0; count < limit; ++count) {
 755
 756                 bdp = greth->rx_bd_base + greth->rx_cur;
 757                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 758                 mb();
 759                 status = greth_read_bd(&bdp->stat);
 760
 761                 if (unlikely(status & GRETH_BD_EN)) {
 762                         break;
 763                 }
 764
 765                 dma_addr = greth_read_bd(&bdp->addr);
 766                 bad = 0;
 767
 768                 /* Check status for errors. */
 769                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 770                         if (status & GRETH_RXBD_ERR_FT) {
 771                                 dev->stats.rx_length_errors++;
 772                                 bad = 1;
 773                         }
 774                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 775                                 dev->stats.rx_frame_errors++;
 776                                 bad = 1;
 777                         }
 778                         if (status & GRETH_RXBD_ERR_CRC) {
 779                                 dev->stats.rx_crc_errors++;
 780                                 bad = 1;
 781                         }
 782                 }
 783                 if (unlikely(bad)) {
 784                         dev->stats.rx_errors++;
 785
 786                 } else {
 787
 788                         pkt_len = status & GRETH_BD_LEN;
 789
 790                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 791
 792                         if (unlikely(skb == NULL)) {
 793
 794                                 if (net_ratelimit())
 795                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 796
 797                                 dev->stats.rx_dropped++;
 798
 799                         } else {
 800                                 skb_reserve(skb, NET_IP_ALIGN);
 801
 802                                 dma_sync_single_for_cpu(greth->dev,
 803                                                         dma_addr,
 804                                                         pkt_len,
 805                                                         DMA_FROM_DEVICE);
 806
 807                                 if (netif_msg_pktdata(greth))
 808                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 809
 810                                 skb_put_data(skb, phys_to_virt(dma_addr),
 811                                              pkt_len);
 812
 813                                 skb->protocol = eth_type_trans(skb, dev);
 814                                 dev->stats.rx_bytes += pkt_len;
 815                                 dev->stats.rx_packets++;
 816                                 netif_receive_skb(skb);
 817                         }
 818                 }
 819
 820                 status = GRETH_BD_EN | GRETH_BD_IE;
 821                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 822                         status |= GRETH_BD_WR;
 823                 }
 824
 825                 wmb();
 826                 greth_write_bd(&bdp->stat, status);
 827
 828                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 829
 830                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 831                 greth_enable_rx(greth);
 832                 spin_unlock_irqrestore(&greth->devlock, flags);
 833
 834                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 835         }
 836
 837         return count;
 838 }
 839
 840 static inline int hw_checksummed(u32 status)
 841 {
 842
 843         if (status & GRETH_RXBD_IP_FRAG)
 844                 return 0;
 845
 846         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 847                 return 0;
 848
 849         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 850                 return 0;
 851
 852         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 853                 return 0;
 854
 855         return 1;
 856 }
 857
 858 static int greth_rx_gbit(struct net_device *dev, int limit)
 859 {
 860         struct greth_private *greth;
 861         struct greth_bd *bdp;
 862         struct sk_buff *skb, *newskb;
 863         int pkt_len;
 864         int bad, count = 0;
 865         u32 status, dma_addr;
 866         unsigned long flags;
 867
 868         greth = netdev_priv(dev);
 869
 870         for (count = 0; count < limit; ++count) {
 871
 872                 bdp = greth->rx_bd_base + greth->rx_cur;
 873                 skb = greth->rx_skbuff[greth->rx_cur];
 874                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 875                 mb();
 876                 status = greth_read_bd(&bdp->stat);
 877                 bad = 0;
 878
 879                 if (status & GRETH_BD_EN)
 880                         break;
 881
 882                 /* Check status for errors. */
 883                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 884
 885                         if (status & GRETH_RXBD_ERR_FT) {
 886                                 dev->stats.rx_length_errors++;
 887                                 bad = 1;
 888                         } else if (status &
 889                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 890                                 dev->stats.rx_frame_errors++;
 891                                 bad = 1;
 892                         } else if (status & GRETH_RXBD_ERR_CRC) {
 893                                 dev->stats.rx_crc_errors++;
 894                                 bad = 1;
 895                         }
 896                 }
 897
 898                 /* Allocate new skb to replace current, not needed if the
 899                  * current skb can be reused */
 900                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 901                         skb_reserve(newskb, NET_IP_ALIGN);
 902
 903                         dma_addr = dma_map_single(greth->dev,
 904                                                       newskb->data,
 905                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 906                                                       DMA_FROM_DEVICE);
 907
 908                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 909                                 /* Process the incoming frame. */
 910                                 pkt_len = status & GRETH_BD_LEN;
 911
 912                                 dma_unmap_single(greth->dev,
 913                                                  greth_read_bd(&bdp->addr),
 914                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 915                                                  DMA_FROM_DEVICE);
 916
 917                                 if (netif_msg_pktdata(greth))
 918                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 919
 920                                 skb_put(skb, pkt_len);
 921
 922                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 923                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 924                                 else
 925                                         skb_checksum_none_assert(skb);
 926
 927                                 skb->protocol = eth_type_trans(skb, dev);
 928                                 dev->stats.rx_packets++;
 929                                 dev->stats.rx_bytes += pkt_len;
 930                                 netif_receive_skb(skb);
 931
 932                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 933                                 greth_write_bd(&bdp->addr, dma_addr);
 934                         } else {
 935                                 if (net_ratelimit())
 936                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 937                                 dev_kfree_skb(newskb);
 938                                 /* reusing current skb, so it is a drop */
 939                                 dev->stats.rx_dropped++;
 940                         }
 941                 } else if (bad) {
 942                         /* Bad Frame transfer, the skb is reused */
 943                         dev->stats.rx_dropped++;
 944                 } else {
 945                         /* Failed Allocating a new skb. This is rather stupid
 946                          * but the current "filled" skb is reused, as if
 947                          * transfer failure. One could argue that RX descriptor
 948                          * table handling should be divided into cleaning and
 949                          * filling as the TX part of the driver
 950                          */
 951                         if (net_ratelimit())
 952                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 953                         /* reusing current skb, so it is a drop */
 954                         dev->stats.rx_dropped++;
 955                 }
 956
 957                 status = GRETH_BD_EN | GRETH_BD_IE;
 958                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 959                         status |= GRETH_BD_WR;
 960                 }
 961
 962                 wmb();
 963                 greth_write_bd(&bdp->stat, status);
 964                 spin_lock_irqsave(&greth->devlock, flags);
 965                 greth_enable_rx(greth);
 966                 spin_unlock_irqrestore(&greth->devlock, flags);
 967                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 968         }
 969
 970         return count;
 971
 972 }
 973
 974 static int greth_poll(struct napi_struct *napi, int budget)
 975 {
 976         struct greth_private *greth;
 977         int work_done = 0;
 978         unsigned long flags;
 979         u32 mask, ctrl;
 980         greth = container_of(napi, struct greth_private, napi);
 981
 982 restart_txrx_poll:
 983         if (greth->gbit_mac) {
 984                 greth_clean_tx_gbit(greth->netdev);
 985                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 986         } else {
 987                 if (netif_queue_stopped(greth->netdev))
 988                         greth_clean_tx(greth->netdev);
 989                 work_done += greth_rx(greth->netdev, budget - work_done);
 990         }
 991
 992         if (work_done < budget) {
 993
 994                 spin_lock_irqsave(&greth->devlock, flags);
 995
 996                 ctrl = GRETH_REGLOAD(greth->regs->control);
 997                 if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
 998                     (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
 999                         GRETH_REGSAVE(greth->regs->control,
1000                                         ctrl | GRETH_TXI | GRETH_RXI);
1001                         mask = GRETH_INT_RX | GRETH_INT_RE |
1002                                GRETH_INT_TX | GRETH_INT_TE;
1003                 } else {
1004                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
1005                         mask = GRETH_INT_RX | GRETH_INT_RE;
1006                 }
1007
1008                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1009                         GRETH_REGSAVE(greth->regs->control, ctrl);
1010                         spin_unlock_irqrestore(&greth->devlock, flags);
1011                         goto restart_txrx_poll;
1012                 } else {
1013                         napi_complete_done(napi, work_done);
1014                         spin_unlock_irqrestore(&greth->devlock, flags);
1015                 }
1016         }
1017
1018         return work_done;
1019 }
1020
1021 static int greth_set_mac_add(struct net_device *dev, void *p)
1022 {
1023         struct sockaddr *addr = p;
1024         struct greth_private *greth;
1025         struct greth_regs *regs;
1026
1027         greth = netdev_priv(dev);
1028         regs = greth->regs;
1029
1030         if (!is_valid_ether_addr(addr->sa_data))
1031                 return -EADDRNOTAVAIL;
1032
1033         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1034         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1035         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1036                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1037
1038         return 0;
1039 }
1040
1041 static u32 greth_hash_get_index(__u8 *addr)
1042 {
1043         return (ether_crc(6, addr)) & 0x3F;
1044 }
1045
1046 static void greth_set_hash_filter(struct net_device *dev)
1047 {
1048         struct netdev_hw_addr *ha;
1049         struct greth_private *greth = netdev_priv(dev);
1050         struct greth_regs *regs = greth->regs;
1051         u32 mc_filter[2];
1052         unsigned int bitnr;
1053
1054         mc_filter[0] = mc_filter[1] = 0;
1055
1056         netdev_for_each_mc_addr(ha, dev) {
1057                 bitnr = greth_hash_get_index(ha->addr);
1058                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1059         }
1060
1061         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1062         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1063 }
1064
1065 static void greth_set_multicast_list(struct net_device *dev)
1066 {
1067         int cfg;
1068         struct greth_private *greth = netdev_priv(dev);
1069         struct greth_regs *regs = greth->regs;
1070
1071         cfg = GRETH_REGLOAD(regs->control);
1072         if (dev->flags & IFF_PROMISC)
1073                 cfg |= GRETH_CTRL_PR;
1074         else
1075                 cfg &= ~GRETH_CTRL_PR;
1076
1077         if (greth->multicast) {
1078                 if (dev->flags & IFF_ALLMULTI) {
1079                         GRETH_REGSAVE(regs->hash_msb, -1);
1080                         GRETH_REGSAVE(regs->hash_lsb, -1);
1081                         cfg |= GRETH_CTRL_MCEN;
1082                         GRETH_REGSAVE(regs->control, cfg);
1083                         return;
1084                 }
1085
1086                 if (netdev_mc_empty(dev)) {
1087                         cfg &= ~GRETH_CTRL_MCEN;
1088                         GRETH_REGSAVE(regs->control, cfg);
1089                         return;
1090                 }
1091
1092                 /* Setup multicast filter */
1093                 greth_set_hash_filter(dev);
1094                 cfg |= GRETH_CTRL_MCEN;
1095         }
1096         GRETH_REGSAVE(regs->control, cfg);
1097 }
1098
1099 static u32 greth_get_msglevel(struct net_device *dev)
1100 {
1101         struct greth_private *greth = netdev_priv(dev);
1102         return greth->msg_enable;
1103 }
1104
1105 static void greth_set_msglevel(struct net_device *dev, u32 value)
1106 {
1107         struct greth_private *greth = netdev_priv(dev);
1108         greth->msg_enable = value;
1109 }
1110
1111 static int greth_get_regs_len(struct net_device *dev)
1112 {
1113         return sizeof(struct greth_regs);
1114 }
1115
1116 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1117 {
1118         struct greth_private *greth = netdev_priv(dev);
1119
1120         strlcpy(info->driver, dev_driver_string(greth->dev),
1121                 sizeof(info->driver));
1122         strlcpy(info->version, "revision: 1.0", sizeof(info->version));
1123         strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1124         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1125 }
1126
1127 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1128 {
1129         int i;
1130         struct greth_private *greth = netdev_priv(dev);
1131         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1132         u32 *buff = p;
1133
1134         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1135                 buff[i] = greth_read_bd(&greth_regs[i]);
1136 }
1137
1138 static const struct ethtool_ops greth_ethtool_ops = {
1139         .get_msglevel           = greth_get_msglevel,
1140         .set_msglevel           = greth_set_msglevel,
1141         .get_drvinfo            = greth_get_drvinfo,
1142         .get_regs_len           = greth_get_regs_len,
1143         .get_regs               = greth_get_regs,
1144         .get_link               = ethtool_op_get_link,
1145         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
1146         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
1147 };
1148
1149 static struct net_device_ops greth_netdev_ops = {
1150         .ndo_open               = greth_open,
1151         .ndo_stop               = greth_close,
1152         .ndo_start_xmit         = greth_start_xmit,
1153         .ndo_set_mac_address    = greth_set_mac_add,
1154         .ndo_validate_addr      = eth_validate_addr,
1155 };
1156
1157 static inline int wait_for_mdio(struct greth_private *greth)
1158 {
1159         unsigned long timeout = jiffies + 4*HZ/100;
1160         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1161                 if (time_after(jiffies, timeout))
1162                         return 0;
1163         }
1164         return 1;
1165 }
1166
1167 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1168 {
1169         struct greth_private *greth = bus->priv;
1170         int data;
1171
1172         if (!wait_for_mdio(greth))
1173                 return -EBUSY;
1174
1175         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1176
1177         if (!wait_for_mdio(greth))
1178                 return -EBUSY;
1179
1180         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1181                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1182                 return data;
1183
1184         } else {
1185                 return -1;
1186         }
1187 }
1188
1189 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1190 {
1191         struct greth_private *greth = bus->priv;
1192
1193         if (!wait_for_mdio(greth))
1194                 return -EBUSY;
1195
1196         GRETH_REGSAVE(greth->regs->mdio,
1197                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1198
1199         if (!wait_for_mdio(greth))
1200                 return -EBUSY;
1201
1202         return 0;
1203 }
1204
1205 static void greth_link_change(struct net_device *dev)
1206 {
1207         struct greth_private *greth = netdev_priv(dev);
1208         struct phy_device *phydev = dev->phydev;
1209         unsigned long flags;
1210         int status_change = 0;
1211         u32 ctrl;
1212
1213         spin_lock_irqsave(&greth->devlock, flags);
1214
1215         if (phydev->link) {
1216
1217                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1218                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1219                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1220
1221                         if (phydev->duplex)
1222                                 ctrl |= GRETH_CTRL_FD;
1223
1224                         if (phydev->speed == SPEED_100)
1225                                 ctrl |= GRETH_CTRL_SP;
1226                         else if (phydev->speed == SPEED_1000)
1227                                 ctrl |= GRETH_CTRL_GB;
1228
1229                         GRETH_REGSAVE(greth->regs->control, ctrl);
1230                         greth->speed = phydev->speed;
1231                         greth->duplex = phydev->duplex;
1232                         status_change = 1;
1233                 }
1234         }
1235
1236         if (phydev->link != greth->link) {
1237                 if (!phydev->link) {
1238                         greth->speed = 0;
1239                         greth->duplex = -1;
1240                 }
1241                 greth->link = phydev->link;
1242
1243                 status_change = 1;
1244         }
1245
1246         spin_unlock_irqrestore(&greth->devlock, flags);
1247
1248         if (status_change) {
1249                 if (phydev->link)
1250                         pr_debug("%s: link up (%d/%s)\n",
1251                                 dev->name, phydev->speed,
1252                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1253                 else
1254                         pr_debug("%s: link down\n", dev->name);
1255         }
1256 }
1257
1258 static int greth_mdio_probe(struct net_device *dev)
1259 {
1260         struct greth_private *greth = netdev_priv(dev);
1261         struct phy_device *phy = NULL;
1262         int ret;
1263
1264         /* Find the first PHY */
1265         phy = phy_find_first(greth->mdio);
1266
1267         if (!phy) {
1268                 if (netif_msg_probe(greth))
1269                         dev_err(&dev->dev, "no PHY found\n");
1270                 return -ENXIO;
1271         }
1272
1273         ret = phy_connect_direct(dev, phy, &greth_link_change,
1274                                  greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1275         if (ret) {
1276                 if (netif_msg_ifup(greth))
1277                         dev_err(&dev->dev, "could not attach to PHY\n");
1278                 return ret;
1279         }
1280
1281         if (greth->gbit_mac)
1282                 phy_set_max_speed(phy, SPEED_1000);
1283         else
1284                 phy_set_max_speed(phy, SPEED_100);
1285
1286         linkmode_copy(phy->advertising, phy->supported);
1287
1288         greth->link = 0;
1289         greth->speed = 0;
1290         greth->duplex = -1;
1291
1292         return 0;
1293 }
1294
1295 static int greth_mdio_init(struct greth_private *greth)
1296 {
1297         int ret;
1298         unsigned long timeout;
1299         struct net_device *ndev = greth->netdev;
1300
1301         greth->mdio = mdiobus_alloc();
1302         if (!greth->mdio) {
1303                 return -ENOMEM;
1304         }
1305
1306         greth->mdio->name = "greth-mdio";
1307         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1308         greth->mdio->read = greth_mdio_read;
1309         greth->mdio->write = greth_mdio_write;
1310         greth->mdio->priv = greth;
1311
1312         ret = mdiobus_register(greth->mdio);
1313         if (ret) {
1314                 goto error;
1315         }
1316
1317         ret = greth_mdio_probe(greth->netdev);
1318         if (ret) {
1319                 if (netif_msg_probe(greth))
1320                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1321                 goto unreg_mdio;
1322         }
1323
1324         phy_start(ndev->phydev);
1325
1326         /* If Ethernet debug link is used make autoneg happen right away */
1327         if (greth->edcl && greth_edcl == 1) {
1328                 phy_start_aneg(ndev->phydev);
1329                 timeout = jiffies + 6*HZ;
1330                 while (!phy_aneg_done(ndev->phydev) &&
1331                        time_before(jiffies, timeout)) {
1332                 }
1333                 phy_read_status(ndev->phydev);
1334                 greth_link_change(greth->netdev);
1335         }
1336
1337         return 0;
1338
1339 unreg_mdio:
1340         mdiobus_unregister(greth->mdio);
1341 error:
1342         mdiobus_free(greth->mdio);
1343         return ret;
1344 }
1345
1346 /* Initialize the GRETH MAC */
1347 static int greth_of_probe(struct platform_device *ofdev)
1348 {
1349         struct net_device *dev;
1350         struct greth_private *greth;
1351         struct greth_regs *regs;
1352
1353         int i;
1354         int err;
1355         int tmp;
1356         unsigned long timeout;
1357
1358         dev = alloc_etherdev(sizeof(struct greth_private));
1359
1360         if (dev == NULL)
1361                 return -ENOMEM;
1362
1363         greth = netdev_priv(dev);
1364         greth->netdev = dev;
1365         greth->dev = &ofdev->dev;
1366
1367         if (greth_debug > 0)
1368                 greth->msg_enable = greth_debug;
1369         else
1370                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1371
1372         spin_lock_init(&greth->devlock);
1373
1374         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1375                                  resource_size(&ofdev->resource[0]),
1376                                  "grlib-greth regs");
1377
1378         if (greth->regs == NULL) {
1379                 if (netif_msg_probe(greth))
1380                         dev_err(greth->dev, "ioremap failure.\n");
1381                 err = -EIO;
1382                 goto error1;
1383         }
1384
1385         regs = greth->regs;
1386         greth->irq = ofdev->archdata.irqs[0];
1387
1388         dev_set_drvdata(greth->dev, dev);
1389         SET_NETDEV_DEV(dev, greth->dev);
1390
1391         if (netif_msg_probe(greth))
1392                 dev_dbg(greth->dev, "resetting controller.\n");
1393
1394         /* Reset the controller. */
1395         GRETH_REGSAVE(regs->control, GRETH_RESET);
1396
1397         /* Wait for MAC to reset itself */
1398         timeout = jiffies + HZ/100;
1399         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1400                 if (time_after(jiffies, timeout)) {
1401                         err = -EIO;
1402                         if (netif_msg_probe(greth))
1403                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1404                         goto error2;
1405                 }
1406         }
1407
1408         /* Get default PHY address  */
1409         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1410
1411         /* Check if we have GBIT capable MAC */
1412         tmp = GRETH_REGLOAD(regs->control);
1413         greth->gbit_mac = (tmp >> 27) & 1;
1414
1415         /* Check for multicast capability */
1416         greth->multicast = (tmp >> 25) & 1;
1417
1418         greth->edcl = (tmp >> 31) & 1;
1419
1420         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1421          * it doesn't interfere with the software */
1422         if (greth->edcl != 0)
1423                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1424
1425         /* Check if MAC can handle MDIO interrupts */
1426         greth->mdio_int_en = (tmp >> 26) & 1;
1427
1428         err = greth_mdio_init(greth);
1429         if (err) {
1430                 if (netif_msg_probe(greth))
1431                         dev_err(greth->dev, "failed to register MDIO bus\n");
1432                 goto error2;
1433         }
1434
1435         /* Allocate TX descriptor ring in coherent memory */
1436         greth->tx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1437                                                &greth->tx_bd_base_phys,
1438                                                GFP_KERNEL);
1439         if (!greth->tx_bd_base) {
1440                 err = -ENOMEM;
1441                 goto error3;
1442         }
1443
1444         /* Allocate RX descriptor ring in coherent memory */
1445         greth->rx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1446                                                &greth->rx_bd_base_phys,
1447                                                GFP_KERNEL);
1448         if (!greth->rx_bd_base) {
1449                 err = -ENOMEM;
1450                 goto error4;
1451         }
1452
1453         /* Get MAC address from: module param, OF property or ID prom */
1454         for (i = 0; i < 6; i++) {
1455                 if (macaddr[i] != 0)
1456                         break;
1457         }
1458         if (i == 6) {
1459                 const u8 *addr;
1460
1461                 addr = of_get_mac_address(ofdev->dev.of_node);
1462                 if (addr) {
1463                         for (i = 0; i < 6; i++)
1464                                 macaddr[i] = (unsigned int) addr[i];
1465                 } else {
1466 #ifdef CONFIG_SPARC
1467                         for (i = 0; i < 6; i++)
1468                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1469 #endif
1470                 }
1471         }
1472
1473         for (i = 0; i < 6; i++)
1474                 dev->dev_addr[i] = macaddr[i];
1475
1476         macaddr[5]++;
1477
1478         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1479                 if (netif_msg_probe(greth))
1480                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1481                 err = -EINVAL;
1482                 goto error5;
1483         }
1484
1485         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1486         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1487                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1488
1489         /* Clear all pending interrupts except PHY irq */
1490         GRETH_REGSAVE(regs->status, 0xFF);
1491
1492         if (greth->gbit_mac) {
1493                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1494                         NETIF_F_RXCSUM;
1495                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1496                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1497         }
1498
1499         if (greth->multicast) {
1500                 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1501                 dev->flags |= IFF_MULTICAST;
1502         } else {
1503                 dev->flags &= ~IFF_MULTICAST;
1504         }
1505
1506         dev->netdev_ops = &greth_netdev_ops;
1507         dev->ethtool_ops = &greth_ethtool_ops;
1508
1509         err = register_netdev(dev);
1510         if (err) {
1511                 if (netif_msg_probe(greth))
1512                         dev_err(greth->dev, "netdevice registration failed.\n");
1513                 goto error5;
1514         }
1515
1516         /* setup NAPI */
1517         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1518
1519         return 0;
1520
1521 error5:
1522         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1523 error4:
1524         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1525 error3:
1526         mdiobus_unregister(greth->mdio);
1527 error2:
1528         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1529 error1:
1530         free_netdev(dev);
1531         return err;
1532 }
1533
1534 static int greth_of_remove(struct platform_device *of_dev)
1535 {
1536         struct net_device *ndev = platform_get_drvdata(of_dev);
1537         struct greth_private *greth = netdev_priv(ndev);
1538
1539         /* Free descriptor areas */
1540         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1541
1542         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1543
1544         if (ndev->phydev)
1545                 phy_stop(ndev->phydev);
1546         mdiobus_unregister(greth->mdio);
1547
1548         unregister_netdev(ndev);
1549         free_netdev(ndev);
1550
1551         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1552
1553         return 0;
1554 }
1555
1556 static const struct of_device_id greth_of_match[] = {
1557         {
1558          .name = "GAISLER_ETHMAC",
1559          },
1560         {
1561          .name = "01_01d",
1562          },
1563         {},
1564 };
1565
1566 MODULE_DEVICE_TABLE(of, greth_of_match);
1567
1568 static struct platform_driver greth_of_driver = {
1569         .driver = {
1570                 .name = "grlib-greth",
1571                 .of_match_table = greth_of_match,
1572         },
1573         .probe = greth_of_probe,
1574         .remove = greth_of_remove,
1575 };
1576
1577 module_platform_driver(greth_of_driver);
1578
1579 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1580 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1581 MODULE_LICENSE("GPL");