drivers/net/greth.c

   1 /*
   2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
   3  *
   4  * 2005-2010 (c) Aeroflex Gaisler AB
   5  *
   6  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
   7  * available in the GRLIB VHDL IP core library.
   8  *
   9  * Full documentation of both cores can be found here:
  10  * http://www.gaisler.com/products/grlib/grip.pdf
  11  *
  12  * The Gigabit version supports scatter/gather DMA, any alignment of
  13  * buffers and checksum offloading.
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the
  17  * Free Software Foundation; either version 2 of the License, or (at your
  18  * option) any later version.
  19  *
  20  * Contributors: Kristoffer Glembo
  21  *               Daniel Hellstrom
  22  *               Marko Isomaki
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/init.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/io.h>
  33 #include <linux/crc32.h>
  34 #include <linux/mii.h>
  35 #include <linux/of_device.h>
  36 #include <linux/of_platform.h>
  37 #include <linux/slab.h>
  38 #include <asm/cacheflush.h>
  39 #include <asm/byteorder.h>
  40
  41 #ifdef CONFIG_SPARC
  42 #include <asm/idprom.h>
  43 #endif
  44
  45 #include "greth.h"
  46
  47 #define GRETH_DEF_MSG_ENABLE      \
  48         (NETIF_MSG_DRV          | \
  49          NETIF_MSG_PROBE        | \
  50          NETIF_MSG_LINK         | \
  51          NETIF_MSG_IFDOWN       | \
  52          NETIF_MSG_IFUP         | \
  53          NETIF_MSG_RX_ERR       | \
  54          NETIF_MSG_TX_ERR)
  55
  56 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  57 module_param(greth_debug, int, 0);
  58 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  59
  60 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  61 static int macaddr[6];
  62 module_param_array(macaddr, int, NULL, 0);
  63 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  64
  65 static int greth_edcl = 1;
  66 module_param(greth_edcl, int, 0);
  67 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  68
  69 static int greth_open(struct net_device *dev);
  70 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  71            struct net_device *dev);
  72 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  73            struct net_device *dev);
  74 static int greth_rx(struct net_device *dev, int limit);
  75 static int greth_rx_gbit(struct net_device *dev, int limit);
  76 static void greth_clean_tx(struct net_device *dev);
  77 static void greth_clean_tx_gbit(struct net_device *dev);
  78 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  79 static int greth_close(struct net_device *dev);
  80 static int greth_set_mac_add(struct net_device *dev, void *p);
  81 static void greth_set_multicast_list(struct net_device *dev);
  82
  83 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  84 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  85 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  86 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  87
  88 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  89 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  90 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  91
  92 static void greth_print_rx_packet(void *addr, int len)
  93 {
  94         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  95                         addr, len, true);
  96 }
  97
  98 static void greth_print_tx_packet(struct sk_buff *skb)
  99 {
 100         int i;
 101         int length;
 102
 103         if (skb_shinfo(skb)->nr_frags == 0)
 104                 length = skb->len;
 105         else
 106                 length = skb_headlen(skb);
 107
 108         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 109                         skb->data, length, true);
 110
 111         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 112
 113                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 114                                phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
 115                                skb_shinfo(skb)->frags[i].page_offset,
 116                                length, true);
 117         }
 118 }
 119
 120 static inline void greth_enable_tx(struct greth_private *greth)
 121 {
 122         wmb();
 123         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 124 }
 125
 126 static inline void greth_disable_tx(struct greth_private *greth)
 127 {
 128         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 129 }
 130
 131 static inline void greth_enable_rx(struct greth_private *greth)
 132 {
 133         wmb();
 134         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 135 }
 136
 137 static inline void greth_disable_rx(struct greth_private *greth)
 138 {
 139         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 140 }
 141
 142 static inline void greth_enable_irqs(struct greth_private *greth)
 143 {
 144         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 145 }
 146
 147 static inline void greth_disable_irqs(struct greth_private *greth)
 148 {
 149         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 150 }
 151
 152 static inline void greth_write_bd(u32 *bd, u32 val)
 153 {
 154         __raw_writel(cpu_to_be32(val), bd);
 155 }
 156
 157 static inline u32 greth_read_bd(u32 *bd)
 158 {
 159         return be32_to_cpu(__raw_readl(bd));
 160 }
 161
 162 static void greth_clean_rings(struct greth_private *greth)
 163 {
 164         int i;
 165         struct greth_bd *rx_bdp = greth->rx_bd_base;
 166         struct greth_bd *tx_bdp = greth->tx_bd_base;
 167
 168         if (greth->gbit_mac) {
 169
 170                 /* Free and unmap RX buffers */
 171                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 172                         if (greth->rx_skbuff[i] != NULL) {
 173                                 dev_kfree_skb(greth->rx_skbuff[i]);
 174                                 dma_unmap_single(greth->dev,
 175                                                  greth_read_bd(&rx_bdp->addr),
 176                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 177                                                  DMA_FROM_DEVICE);
 178                         }
 179                 }
 180
 181                 /* TX buffers */
 182                 while (greth->tx_free < GRETH_TXBD_NUM) {
 183
 184                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 185                         int nr_frags = skb_shinfo(skb)->nr_frags;
 186                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 187                         greth->tx_last = NEXT_TX(greth->tx_last);
 188
 189                         dma_unmap_single(greth->dev,
 190                                          greth_read_bd(&tx_bdp->addr),
 191                                          skb_headlen(skb),
 192                                          DMA_TO_DEVICE);
 193
 194                         for (i = 0; i < nr_frags; i++) {
 195                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 196                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 197
 198                                 dma_unmap_page(greth->dev,
 199                                                greth_read_bd(&tx_bdp->addr),
 200                                                frag->size,
 201                                                DMA_TO_DEVICE);
 202
 203                                 greth->tx_last = NEXT_TX(greth->tx_last);
 204                         }
 205                         greth->tx_free += nr_frags+1;
 206                         dev_kfree_skb(skb);
 207                 }
 208
 209
 210         } else { /* 10/100 Mbps MAC */
 211
 212                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 213                         kfree(greth->rx_bufs[i]);
 214                         dma_unmap_single(greth->dev,
 215                                          greth_read_bd(&rx_bdp->addr),
 216                                          MAX_FRAME_SIZE,
 217                                          DMA_FROM_DEVICE);
 218                 }
 219                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 220                         kfree(greth->tx_bufs[i]);
 221                         dma_unmap_single(greth->dev,
 222                                          greth_read_bd(&tx_bdp->addr),
 223                                          MAX_FRAME_SIZE,
 224                                          DMA_TO_DEVICE);
 225                 }
 226         }
 227 }
 228
 229 static int greth_init_rings(struct greth_private *greth)
 230 {
 231         struct sk_buff *skb;
 232         struct greth_bd *rx_bd, *tx_bd;
 233         u32 dma_addr;
 234         int i;
 235
 236         rx_bd = greth->rx_bd_base;
 237         tx_bd = greth->tx_bd_base;
 238
 239         /* Initialize descriptor rings and buffers */
 240         if (greth->gbit_mac) {
 241
 242                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 243                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 244                         if (skb == NULL) {
 245                                 if (netif_msg_ifup(greth))
 246                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 247                                 goto cleanup;
 248                         }
 249                         skb_reserve(skb, NET_IP_ALIGN);
 250                         dma_addr = dma_map_single(greth->dev,
 251                                                   skb->data,
 252                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 253                                                   DMA_FROM_DEVICE);
 254
 255                         if (dma_mapping_error(greth->dev, dma_addr)) {
 256                                 if (netif_msg_ifup(greth))
 257                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 258                                 goto cleanup;
 259                         }
 260                         greth->rx_skbuff[i] = skb;
 261                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 262                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 263                 }
 264
 265         } else {
 266
 267                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 268                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 269
 270                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 271
 272                         if (greth->rx_bufs[i] == NULL) {
 273                                 if (netif_msg_ifup(greth))
 274                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 275                                 goto cleanup;
 276                         }
 277
 278                         dma_addr = dma_map_single(greth->dev,
 279                                                   greth->rx_bufs[i],
 280                                                   MAX_FRAME_SIZE,
 281                                                   DMA_FROM_DEVICE);
 282
 283                         if (dma_mapping_error(greth->dev, dma_addr)) {
 284                                 if (netif_msg_ifup(greth))
 285                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 286                                 goto cleanup;
 287                         }
 288                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 289                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 290                 }
 291                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 292
 293                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 294
 295                         if (greth->tx_bufs[i] == NULL) {
 296                                 if (netif_msg_ifup(greth))
 297                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 298                                 goto cleanup;
 299                         }
 300
 301                         dma_addr = dma_map_single(greth->dev,
 302                                                   greth->tx_bufs[i],
 303                                                   MAX_FRAME_SIZE,
 304                                                   DMA_TO_DEVICE);
 305
 306                         if (dma_mapping_error(greth->dev, dma_addr)) {
 307                                 if (netif_msg_ifup(greth))
 308                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 309                                 goto cleanup;
 310                         }
 311                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 312                         greth_write_bd(&tx_bd[i].stat, 0);
 313                 }
 314         }
 315         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 316                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 317
 318         /* Initialize pointers. */
 319         greth->rx_cur = 0;
 320         greth->tx_next = 0;
 321         greth->tx_last = 0;
 322         greth->tx_free = GRETH_TXBD_NUM;
 323
 324         /* Initialize descriptor base address */
 325         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 326         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 327
 328         return 0;
 329
 330 cleanup:
 331         greth_clean_rings(greth);
 332         return -ENOMEM;
 333 }
 334
 335 static int greth_open(struct net_device *dev)
 336 {
 337         struct greth_private *greth = netdev_priv(dev);
 338         int err;
 339
 340         err = greth_init_rings(greth);
 341         if (err) {
 342                 if (netif_msg_ifup(greth))
 343                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 344                 return err;
 345         }
 346
 347         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 348         if (err) {
 349                 if (netif_msg_ifup(greth))
 350                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 351                 greth_clean_rings(greth);
 352                 return err;
 353         }
 354
 355         if (netif_msg_ifup(greth))
 356                 dev_dbg(&dev->dev, " starting queue\n");
 357         netif_start_queue(dev);
 358
 359         GRETH_REGSAVE(greth->regs->status, 0xFF);
 360
 361         napi_enable(&greth->napi);
 362
 363         greth_enable_irqs(greth);
 364         greth_enable_tx(greth);
 365         greth_enable_rx(greth);
 366         return 0;
 367
 368 }
 369
 370 static int greth_close(struct net_device *dev)
 371 {
 372         struct greth_private *greth = netdev_priv(dev);
 373
 374         napi_disable(&greth->napi);
 375
 376         greth_disable_irqs(greth);
 377         greth_disable_tx(greth);
 378         greth_disable_rx(greth);
 379
 380         netif_stop_queue(dev);
 381
 382         free_irq(greth->irq, (void *) dev);
 383
 384         greth_clean_rings(greth);
 385
 386         return 0;
 387 }
 388
 389 static netdev_tx_t
 390 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 391 {
 392         struct greth_private *greth = netdev_priv(dev);
 393         struct greth_bd *bdp;
 394         int err = NETDEV_TX_OK;
 395         u32 status, dma_addr, ctrl;
 396         unsigned long flags;
 397
 398         /* Clean TX Ring */
 399         greth_clean_tx(greth->netdev);
 400
 401         if (unlikely(greth->tx_free <= 0)) {
 402                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 403                 ctrl = GRETH_REGLOAD(greth->regs->control);
 404                 /* Enable TX IRQ only if not already in poll() routine */
 405                 if (ctrl & GRETH_RXI)
 406                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 407                 netif_stop_queue(dev);
 408                 spin_unlock_irqrestore(&greth->devlock, flags);
 409                 return NETDEV_TX_BUSY;
 410         }
 411
 412         if (netif_msg_pktdata(greth))
 413                 greth_print_tx_packet(skb);
 414
 415
 416         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 417                 dev->stats.tx_errors++;
 418                 goto out;
 419         }
 420
 421         bdp = greth->tx_bd_base + greth->tx_next;
 422         dma_addr = greth_read_bd(&bdp->addr);
 423
 424         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 425
 426         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 427
 428         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 429
 430         /* Wrap around descriptor ring */
 431         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 432                 status |= GRETH_BD_WR;
 433         }
 434
 435         greth->tx_next = NEXT_TX(greth->tx_next);
 436         greth->tx_free--;
 437
 438         /* Write descriptor control word and enable transmission */
 439         greth_write_bd(&bdp->stat, status);
 440         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 441         greth_enable_tx(greth);
 442         spin_unlock_irqrestore(&greth->devlock, flags);
 443
 444 out:
 445         dev_kfree_skb(skb);
 446         return err;
 447 }
 448
 449
 450 static netdev_tx_t
 451 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 452 {
 453         struct greth_private *greth = netdev_priv(dev);
 454         struct greth_bd *bdp;
 455         u32 status = 0, dma_addr, ctrl;
 456         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 457         unsigned long flags;
 458
 459         nr_frags = skb_shinfo(skb)->nr_frags;
 460
 461         /* Clean TX Ring */
 462         greth_clean_tx_gbit(dev);
 463
 464         if (greth->tx_free < nr_frags + 1) {
 465                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 466                 ctrl = GRETH_REGLOAD(greth->regs->control);
 467                 /* Enable TX IRQ only if not already in poll() routine */
 468                 if (ctrl & GRETH_RXI)
 469                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 470                 netif_stop_queue(dev);
 471                 spin_unlock_irqrestore(&greth->devlock, flags);
 472                 err = NETDEV_TX_BUSY;
 473                 goto out;
 474         }
 475
 476         if (netif_msg_pktdata(greth))
 477                 greth_print_tx_packet(skb);
 478
 479         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 480                 dev->stats.tx_errors++;
 481                 goto out;
 482         }
 483
 484         /* Save skb pointer. */
 485         greth->tx_skbuff[greth->tx_next] = skb;
 486
 487         /* Linear buf */
 488         if (nr_frags != 0)
 489                 status = GRETH_TXBD_MORE;
 490
 491         status |= GRETH_TXBD_CSALL;
 492         status |= skb_headlen(skb) & GRETH_BD_LEN;
 493         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 494                 status |= GRETH_BD_WR;
 495
 496
 497         bdp = greth->tx_bd_base + greth->tx_next;
 498         greth_write_bd(&bdp->stat, status);
 499         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 500
 501         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 502                 goto map_error;
 503
 504         greth_write_bd(&bdp->addr, dma_addr);
 505
 506         curr_tx = NEXT_TX(greth->tx_next);
 507
 508         /* Frags */
 509         for (i = 0; i < nr_frags; i++) {
 510                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 511                 greth->tx_skbuff[curr_tx] = NULL;
 512                 bdp = greth->tx_bd_base + curr_tx;
 513
 514                 status = GRETH_TXBD_CSALL | GRETH_BD_EN;
 515                 status |= frag->size & GRETH_BD_LEN;
 516
 517                 /* Wrap around descriptor ring */
 518                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 519                         status |= GRETH_BD_WR;
 520
 521                 /* More fragments left */
 522                 if (i < nr_frags - 1)
 523                         status |= GRETH_TXBD_MORE;
 524                 else
 525                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 526
 527                 greth_write_bd(&bdp->stat, status);
 528
 529                 dma_addr = dma_map_page(greth->dev,
 530                                         frag->page,
 531                                         frag->page_offset,
 532                                         frag->size,
 533                                         DMA_TO_DEVICE);
 534
 535                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 536                         goto frag_map_error;
 537
 538                 greth_write_bd(&bdp->addr, dma_addr);
 539
 540                 curr_tx = NEXT_TX(curr_tx);
 541         }
 542
 543         wmb();
 544
 545         /* Enable the descriptor chain by enabling the first descriptor */
 546         bdp = greth->tx_bd_base + greth->tx_next;
 547         greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 548         greth->tx_next = curr_tx;
 549         greth->tx_free -= nr_frags + 1;
 550
 551         wmb();
 552
 553         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 554         greth_enable_tx(greth);
 555         spin_unlock_irqrestore(&greth->devlock, flags);
 556
 557         return NETDEV_TX_OK;
 558
 559 frag_map_error:
 560         /* Unmap SKB mappings that succeeded and disable descriptor */
 561         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 562                 bdp = greth->tx_bd_base + greth->tx_next + i;
 563                 dma_unmap_single(greth->dev,
 564                                  greth_read_bd(&bdp->addr),
 565                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 566                                  DMA_TO_DEVICE);
 567                 greth_write_bd(&bdp->stat, 0);
 568         }
 569 map_error:
 570         if (net_ratelimit())
 571                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 572         dev_kfree_skb(skb);
 573 out:
 574         return err;
 575 }
 576
 577 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 578 {
 579         struct net_device *dev = dev_id;
 580         struct greth_private *greth;
 581         u32 status, ctrl;
 582         irqreturn_t retval = IRQ_NONE;
 583
 584         greth = netdev_priv(dev);
 585
 586         spin_lock(&greth->devlock);
 587
 588         /* Get the interrupt events that caused us to be here. */
 589         status = GRETH_REGLOAD(greth->regs->status);
 590
 591         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 592          * set regardless of whether IRQ is enabled or not. Especially
 593          * important when shared IRQ.
 594          */
 595         ctrl = GRETH_REGLOAD(greth->regs->control);
 596
 597         /* Handle rx and tx interrupts through poll */
 598         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 599             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 600                 retval = IRQ_HANDLED;
 601
 602                 /* Disable interrupts and schedule poll() */
 603                 greth_disable_irqs(greth);
 604                 napi_schedule(&greth->napi);
 605         }
 606
 607         mmiowb();
 608         spin_unlock(&greth->devlock);
 609
 610         return retval;
 611 }
 612
 613 static void greth_clean_tx(struct net_device *dev)
 614 {
 615         struct greth_private *greth;
 616         struct greth_bd *bdp;
 617         u32 stat;
 618
 619         greth = netdev_priv(dev);
 620
 621         while (1) {
 622                 bdp = greth->tx_bd_base + greth->tx_last;
 623                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 624                 mb();
 625                 stat = greth_read_bd(&bdp->stat);
 626
 627                 if (unlikely(stat & GRETH_BD_EN))
 628                         break;
 629
 630                 if (greth->tx_free == GRETH_TXBD_NUM)
 631                         break;
 632
 633                 /* Check status for errors */
 634                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 635                         dev->stats.tx_errors++;
 636                         if (stat & GRETH_TXBD_ERR_AL)
 637                                 dev->stats.tx_aborted_errors++;
 638                         if (stat & GRETH_TXBD_ERR_UE)
 639                                 dev->stats.tx_fifo_errors++;
 640                 }
 641                 dev->stats.tx_packets++;
 642                 greth->tx_last = NEXT_TX(greth->tx_last);
 643                 greth->tx_free++;
 644         }
 645
 646         if (greth->tx_free > 0) {
 647                 netif_wake_queue(dev);
 648         }
 649
 650 }
 651
 652 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 653 {
 654         /* Check status for errors */
 655         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 656                 dev->stats.tx_errors++;
 657                 if (stat & GRETH_TXBD_ERR_AL)
 658                         dev->stats.tx_aborted_errors++;
 659                 if (stat & GRETH_TXBD_ERR_UE)
 660                         dev->stats.tx_fifo_errors++;
 661                 if (stat & GRETH_TXBD_ERR_LC)
 662                         dev->stats.tx_aborted_errors++;
 663         }
 664         dev->stats.tx_packets++;
 665 }
 666
 667 static void greth_clean_tx_gbit(struct net_device *dev)
 668 {
 669         struct greth_private *greth;
 670         struct greth_bd *bdp, *bdp_last_frag;
 671         struct sk_buff *skb;
 672         u32 stat;
 673         int nr_frags, i;
 674
 675         greth = netdev_priv(dev);
 676
 677         while (greth->tx_free < GRETH_TXBD_NUM) {
 678
 679                 skb = greth->tx_skbuff[greth->tx_last];
 680
 681                 nr_frags = skb_shinfo(skb)->nr_frags;
 682
 683                 /* We only clean fully completed SKBs */
 684                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
 685
 686                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 687                 mb();
 688                 stat = greth_read_bd(&bdp_last_frag->stat);
 689
 690                 if (stat & GRETH_BD_EN)
 691                         break;
 692
 693                 greth->tx_skbuff[greth->tx_last] = NULL;
 694
 695                 greth_update_tx_stats(dev, stat);
 696
 697                 bdp = greth->tx_bd_base + greth->tx_last;
 698
 699                 greth->tx_last = NEXT_TX(greth->tx_last);
 700
 701                 dma_unmap_single(greth->dev,
 702                                  greth_read_bd(&bdp->addr),
 703                                  skb_headlen(skb),
 704                                  DMA_TO_DEVICE);
 705
 706                 for (i = 0; i < nr_frags; i++) {
 707                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 708                         bdp = greth->tx_bd_base + greth->tx_last;
 709
 710                         dma_unmap_page(greth->dev,
 711                                        greth_read_bd(&bdp->addr),
 712                                        frag->size,
 713                                        DMA_TO_DEVICE);
 714
 715                         greth->tx_last = NEXT_TX(greth->tx_last);
 716                 }
 717                 greth->tx_free += nr_frags+1;
 718                 dev_kfree_skb(skb);
 719         }
 720
 721         if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
 722                 netif_wake_queue(dev);
 723 }
 724
 725 static int greth_rx(struct net_device *dev, int limit)
 726 {
 727         struct greth_private *greth;
 728         struct greth_bd *bdp;
 729         struct sk_buff *skb;
 730         int pkt_len;
 731         int bad, count;
 732         u32 status, dma_addr;
 733         unsigned long flags;
 734
 735         greth = netdev_priv(dev);
 736
 737         for (count = 0; count < limit; ++count) {
 738
 739                 bdp = greth->rx_bd_base + greth->rx_cur;
 740                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 741                 mb();
 742                 status = greth_read_bd(&bdp->stat);
 743
 744                 if (unlikely(status & GRETH_BD_EN)) {
 745                         break;
 746                 }
 747
 748                 dma_addr = greth_read_bd(&bdp->addr);
 749                 bad = 0;
 750
 751                 /* Check status for errors. */
 752                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 753                         if (status & GRETH_RXBD_ERR_FT) {
 754                                 dev->stats.rx_length_errors++;
 755                                 bad = 1;
 756                         }
 757                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 758                                 dev->stats.rx_frame_errors++;
 759                                 bad = 1;
 760                         }
 761                         if (status & GRETH_RXBD_ERR_CRC) {
 762                                 dev->stats.rx_crc_errors++;
 763                                 bad = 1;
 764                         }
 765                 }
 766                 if (unlikely(bad)) {
 767                         dev->stats.rx_errors++;
 768
 769                 } else {
 770
 771                         pkt_len = status & GRETH_BD_LEN;
 772
 773                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 774
 775                         if (unlikely(skb == NULL)) {
 776
 777                                 if (net_ratelimit())
 778                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 779
 780                                 dev->stats.rx_dropped++;
 781
 782                         } else {
 783                                 skb_reserve(skb, NET_IP_ALIGN);
 784                                 skb->dev = dev;
 785
 786                                 dma_sync_single_for_cpu(greth->dev,
 787                                                         dma_addr,
 788                                                         pkt_len,
 789                                                         DMA_FROM_DEVICE);
 790
 791                                 if (netif_msg_pktdata(greth))
 792                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 793
 794                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
 795
 796                                 skb->protocol = eth_type_trans(skb, dev);
 797                                 dev->stats.rx_packets++;
 798                                 netif_receive_skb(skb);
 799                         }
 800                 }
 801
 802                 status = GRETH_BD_EN | GRETH_BD_IE;
 803                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 804                         status |= GRETH_BD_WR;
 805                 }
 806
 807                 wmb();
 808                 greth_write_bd(&bdp->stat, status);
 809
 810                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 811
 812                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 813                 greth_enable_rx(greth);
 814                 spin_unlock_irqrestore(&greth->devlock, flags);
 815
 816                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 817         }
 818
 819         return count;
 820 }
 821
 822 static inline int hw_checksummed(u32 status)
 823 {
 824
 825         if (status & GRETH_RXBD_IP_FRAG)
 826                 return 0;
 827
 828         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 829                 return 0;
 830
 831         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 832                 return 0;
 833
 834         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 835                 return 0;
 836
 837         return 1;
 838 }
 839
 840 static int greth_rx_gbit(struct net_device *dev, int limit)
 841 {
 842         struct greth_private *greth;
 843         struct greth_bd *bdp;
 844         struct sk_buff *skb, *newskb;
 845         int pkt_len;
 846         int bad, count = 0;
 847         u32 status, dma_addr;
 848         unsigned long flags;
 849
 850         greth = netdev_priv(dev);
 851
 852         for (count = 0; count < limit; ++count) {
 853
 854                 bdp = greth->rx_bd_base + greth->rx_cur;
 855                 skb = greth->rx_skbuff[greth->rx_cur];
 856                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 857                 mb();
 858                 status = greth_read_bd(&bdp->stat);
 859                 bad = 0;
 860
 861                 if (status & GRETH_BD_EN)
 862                         break;
 863
 864                 /* Check status for errors. */
 865                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 866
 867                         if (status & GRETH_RXBD_ERR_FT) {
 868                                 dev->stats.rx_length_errors++;
 869                                 bad = 1;
 870                         } else if (status &
 871                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 872                                 dev->stats.rx_frame_errors++;
 873                                 bad = 1;
 874                         } else if (status & GRETH_RXBD_ERR_CRC) {
 875                                 dev->stats.rx_crc_errors++;
 876                                 bad = 1;
 877                         }
 878                 }
 879
 880                 /* Allocate new skb to replace current, not needed if the
 881                  * current skb can be reused */
 882                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 883                         skb_reserve(newskb, NET_IP_ALIGN);
 884
 885                         dma_addr = dma_map_single(greth->dev,
 886                                                       newskb->data,
 887                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 888                                                       DMA_FROM_DEVICE);
 889
 890                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 891                                 /* Process the incoming frame. */
 892                                 pkt_len = status & GRETH_BD_LEN;
 893
 894                                 dma_unmap_single(greth->dev,
 895                                                  greth_read_bd(&bdp->addr),
 896                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 897                                                  DMA_FROM_DEVICE);
 898
 899                                 if (netif_msg_pktdata(greth))
 900                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 901
 902                                 skb_put(skb, pkt_len);
 903
 904                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 905                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 906                                 else
 907                                         skb_checksum_none_assert(skb);
 908
 909                                 skb->protocol = eth_type_trans(skb, dev);
 910                                 dev->stats.rx_packets++;
 911                                 netif_receive_skb(skb);
 912
 913                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 914                                 greth_write_bd(&bdp->addr, dma_addr);
 915                         } else {
 916                                 if (net_ratelimit())
 917                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 918                                 dev_kfree_skb(newskb);
 919                                 /* reusing current skb, so it is a drop */
 920                                 dev->stats.rx_dropped++;
 921                         }
 922                 } else if (bad) {
 923                         /* Bad Frame transfer, the skb is reused */
 924                         dev->stats.rx_dropped++;
 925                 } else {
 926                         /* Failed Allocating a new skb. This is rather stupid
 927                          * but the current "filled" skb is reused, as if
 928                          * transfer failure. One could argue that RX descriptor
 929                          * table handling should be divided into cleaning and
 930                          * filling as the TX part of the driver
 931                          */
 932                         if (net_ratelimit())
 933                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 934                         /* reusing current skb, so it is a drop */
 935                         dev->stats.rx_dropped++;
 936                 }
 937
 938                 status = GRETH_BD_EN | GRETH_BD_IE;
 939                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 940                         status |= GRETH_BD_WR;
 941                 }
 942
 943                 wmb();
 944                 greth_write_bd(&bdp->stat, status);
 945                 spin_lock_irqsave(&greth->devlock, flags);
 946                 greth_enable_rx(greth);
 947                 spin_unlock_irqrestore(&greth->devlock, flags);
 948                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 949         }
 950
 951         return count;
 952
 953 }
 954
 955 static int greth_poll(struct napi_struct *napi, int budget)
 956 {
 957         struct greth_private *greth;
 958         int work_done = 0;
 959         unsigned long flags;
 960         u32 mask, ctrl;
 961         greth = container_of(napi, struct greth_private, napi);
 962
 963 restart_txrx_poll:
 964         if (netif_queue_stopped(greth->netdev)) {
 965                 if (greth->gbit_mac)
 966                         greth_clean_tx_gbit(greth->netdev);
 967                 else
 968                         greth_clean_tx(greth->netdev);
 969         }
 970
 971         if (greth->gbit_mac) {
 972                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 973         } else {
 974                 work_done += greth_rx(greth->netdev, budget - work_done);
 975         }
 976
 977         if (work_done < budget) {
 978
 979                 spin_lock_irqsave(&greth->devlock, flags);
 980
 981                 ctrl = GRETH_REGLOAD(greth->regs->control);
 982                 if (netif_queue_stopped(greth->netdev)) {
 983                         GRETH_REGSAVE(greth->regs->control,
 984                                         ctrl | GRETH_TXI | GRETH_RXI);
 985                         mask = GRETH_INT_RX | GRETH_INT_RE |
 986                                GRETH_INT_TX | GRETH_INT_TE;
 987                 } else {
 988                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
 989                         mask = GRETH_INT_RX | GRETH_INT_RE;
 990                 }
 991
 992                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
 993                         GRETH_REGSAVE(greth->regs->control, ctrl);
 994                         spin_unlock_irqrestore(&greth->devlock, flags);
 995                         goto restart_txrx_poll;
 996                 } else {
 997                         __napi_complete(napi);
 998                         spin_unlock_irqrestore(&greth->devlock, flags);
 999                 }
1000         }
1001
1002         return work_done;
1003 }
1004
1005 static int greth_set_mac_add(struct net_device *dev, void *p)
1006 {
1007         struct sockaddr *addr = p;
1008         struct greth_private *greth;
1009         struct greth_regs *regs;
1010
1011         greth = netdev_priv(dev);
1012         regs = (struct greth_regs *) greth->regs;
1013
1014         if (!is_valid_ether_addr(addr->sa_data))
1015                 return -EINVAL;
1016
1017         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1018         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1019         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1020                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1021
1022         return 0;
1023 }
1024
1025 static u32 greth_hash_get_index(__u8 *addr)
1026 {
1027         return (ether_crc(6, addr)) & 0x3F;
1028 }
1029
1030 static void greth_set_hash_filter(struct net_device *dev)
1031 {
1032         struct netdev_hw_addr *ha;
1033         struct greth_private *greth = netdev_priv(dev);
1034         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1035         u32 mc_filter[2];
1036         unsigned int bitnr;
1037
1038         mc_filter[0] = mc_filter[1] = 0;
1039
1040         netdev_for_each_mc_addr(ha, dev) {
1041                 bitnr = greth_hash_get_index(ha->addr);
1042                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1043         }
1044
1045         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1046         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1047 }
1048
1049 static void greth_set_multicast_list(struct net_device *dev)
1050 {
1051         int cfg;
1052         struct greth_private *greth = netdev_priv(dev);
1053         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1054
1055         cfg = GRETH_REGLOAD(regs->control);
1056         if (dev->flags & IFF_PROMISC)
1057                 cfg |= GRETH_CTRL_PR;
1058         else
1059                 cfg &= ~GRETH_CTRL_PR;
1060
1061         if (greth->multicast) {
1062                 if (dev->flags & IFF_ALLMULTI) {
1063                         GRETH_REGSAVE(regs->hash_msb, -1);
1064                         GRETH_REGSAVE(regs->hash_lsb, -1);
1065                         cfg |= GRETH_CTRL_MCEN;
1066                         GRETH_REGSAVE(regs->control, cfg);
1067                         return;
1068                 }
1069
1070                 if (netdev_mc_empty(dev)) {
1071                         cfg &= ~GRETH_CTRL_MCEN;
1072                         GRETH_REGSAVE(regs->control, cfg);
1073                         return;
1074                 }
1075
1076                 /* Setup multicast filter */
1077                 greth_set_hash_filter(dev);
1078                 cfg |= GRETH_CTRL_MCEN;
1079         }
1080         GRETH_REGSAVE(regs->control, cfg);
1081 }
1082
1083 static u32 greth_get_msglevel(struct net_device *dev)
1084 {
1085         struct greth_private *greth = netdev_priv(dev);
1086         return greth->msg_enable;
1087 }
1088
1089 static void greth_set_msglevel(struct net_device *dev, u32 value)
1090 {
1091         struct greth_private *greth = netdev_priv(dev);
1092         greth->msg_enable = value;
1093 }
1094 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1095 {
1096         struct greth_private *greth = netdev_priv(dev);
1097         struct phy_device *phy = greth->phy;
1098
1099         if (!phy)
1100                 return -ENODEV;
1101
1102         return phy_ethtool_gset(phy, cmd);
1103 }
1104
1105 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1106 {
1107         struct greth_private *greth = netdev_priv(dev);
1108         struct phy_device *phy = greth->phy;
1109
1110         if (!phy)
1111                 return -ENODEV;
1112
1113         return phy_ethtool_sset(phy, cmd);
1114 }
1115
1116 static int greth_get_regs_len(struct net_device *dev)
1117 {
1118         return sizeof(struct greth_regs);
1119 }
1120
1121 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1122 {
1123         struct greth_private *greth = netdev_priv(dev);
1124
1125         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1126         strncpy(info->version, "revision: 1.0", 32);
1127         strncpy(info->bus_info, greth->dev->bus->name, 32);
1128         strncpy(info->fw_version, "N/A", 32);
1129         info->eedump_len = 0;
1130         info->regdump_len = sizeof(struct greth_regs);
1131 }
1132
1133 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1134 {
1135         int i;
1136         struct greth_private *greth = netdev_priv(dev);
1137         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1138         u32 *buff = p;
1139
1140         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1141                 buff[i] = greth_read_bd(&greth_regs[i]);
1142 }
1143
1144 static const struct ethtool_ops greth_ethtool_ops = {
1145         .get_msglevel           = greth_get_msglevel,
1146         .set_msglevel           = greth_set_msglevel,
1147         .get_settings           = greth_get_settings,
1148         .set_settings           = greth_set_settings,
1149         .get_drvinfo            = greth_get_drvinfo,
1150         .get_regs_len           = greth_get_regs_len,
1151         .get_regs               = greth_get_regs,
1152         .get_link               = ethtool_op_get_link,
1153 };
1154
1155 static struct net_device_ops greth_netdev_ops = {
1156         .ndo_open               = greth_open,
1157         .ndo_stop               = greth_close,
1158         .ndo_start_xmit         = greth_start_xmit,
1159         .ndo_set_mac_address    = greth_set_mac_add,
1160         .ndo_validate_addr      = eth_validate_addr,
1161 };
1162
1163 static inline int wait_for_mdio(struct greth_private *greth)
1164 {
1165         unsigned long timeout = jiffies + 4*HZ/100;
1166         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1167                 if (time_after(jiffies, timeout))
1168                         return 0;
1169         }
1170         return 1;
1171 }
1172
1173 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1174 {
1175         struct greth_private *greth = bus->priv;
1176         int data;
1177
1178         if (!wait_for_mdio(greth))
1179                 return -EBUSY;
1180
1181         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1182
1183         if (!wait_for_mdio(greth))
1184                 return -EBUSY;
1185
1186         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1187                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1188                 return data;
1189
1190         } else {
1191                 return -1;
1192         }
1193 }
1194
1195 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1196 {
1197         struct greth_private *greth = bus->priv;
1198
1199         if (!wait_for_mdio(greth))
1200                 return -EBUSY;
1201
1202         GRETH_REGSAVE(greth->regs->mdio,
1203                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1204
1205         if (!wait_for_mdio(greth))
1206                 return -EBUSY;
1207
1208         return 0;
1209 }
1210
1211 static int greth_mdio_reset(struct mii_bus *bus)
1212 {
1213         return 0;
1214 }
1215
1216 static void greth_link_change(struct net_device *dev)
1217 {
1218         struct greth_private *greth = netdev_priv(dev);
1219         struct phy_device *phydev = greth->phy;
1220         unsigned long flags;
1221         int status_change = 0;
1222         u32 ctrl;
1223
1224         spin_lock_irqsave(&greth->devlock, flags);
1225
1226         if (phydev->link) {
1227
1228                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1229                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1230                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1231
1232                         if (phydev->duplex)
1233                                 ctrl |= GRETH_CTRL_FD;
1234
1235                         if (phydev->speed == SPEED_100)
1236                                 ctrl |= GRETH_CTRL_SP;
1237                         else if (phydev->speed == SPEED_1000)
1238                                 ctrl |= GRETH_CTRL_GB;
1239
1240                         GRETH_REGSAVE(greth->regs->control, ctrl);
1241                         greth->speed = phydev->speed;
1242                         greth->duplex = phydev->duplex;
1243                         status_change = 1;
1244                 }
1245         }
1246
1247         if (phydev->link != greth->link) {
1248                 if (!phydev->link) {
1249                         greth->speed = 0;
1250                         greth->duplex = -1;
1251                 }
1252                 greth->link = phydev->link;
1253
1254                 status_change = 1;
1255         }
1256
1257         spin_unlock_irqrestore(&greth->devlock, flags);
1258
1259         if (status_change) {
1260                 if (phydev->link)
1261                         pr_debug("%s: link up (%d/%s)\n",
1262                                 dev->name, phydev->speed,
1263                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1264                 else
1265                         pr_debug("%s: link down\n", dev->name);
1266         }
1267 }
1268
1269 static int greth_mdio_probe(struct net_device *dev)
1270 {
1271         struct greth_private *greth = netdev_priv(dev);
1272         struct phy_device *phy = NULL;
1273         int ret;
1274
1275         /* Find the first PHY */
1276         phy = phy_find_first(greth->mdio);
1277
1278         if (!phy) {
1279                 if (netif_msg_probe(greth))
1280                         dev_err(&dev->dev, "no PHY found\n");
1281                 return -ENXIO;
1282         }
1283
1284         ret = phy_connect_direct(dev, phy, &greth_link_change,
1285                         0, greth->gbit_mac ?
1286                         PHY_INTERFACE_MODE_GMII :
1287                         PHY_INTERFACE_MODE_MII);
1288         if (ret) {
1289                 if (netif_msg_ifup(greth))
1290                         dev_err(&dev->dev, "could not attach to PHY\n");
1291                 return ret;
1292         }
1293
1294         if (greth->gbit_mac)
1295                 phy->supported &= PHY_GBIT_FEATURES;
1296         else
1297                 phy->supported &= PHY_BASIC_FEATURES;
1298
1299         phy->advertising = phy->supported;
1300
1301         greth->link = 0;
1302         greth->speed = 0;
1303         greth->duplex = -1;
1304         greth->phy = phy;
1305
1306         return 0;
1307 }
1308
1309 static inline int phy_aneg_done(struct phy_device *phydev)
1310 {
1311         int retval;
1312
1313         retval = phy_read(phydev, MII_BMSR);
1314
1315         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1316 }
1317
1318 static int greth_mdio_init(struct greth_private *greth)
1319 {
1320         int ret, phy;
1321         unsigned long timeout;
1322
1323         greth->mdio = mdiobus_alloc();
1324         if (!greth->mdio) {
1325                 return -ENOMEM;
1326         }
1327
1328         greth->mdio->name = "greth-mdio";
1329         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1330         greth->mdio->read = greth_mdio_read;
1331         greth->mdio->write = greth_mdio_write;
1332         greth->mdio->reset = greth_mdio_reset;
1333         greth->mdio->priv = greth;
1334
1335         greth->mdio->irq = greth->mdio_irqs;
1336
1337         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1338                 greth->mdio->irq[phy] = PHY_POLL;
1339
1340         ret = mdiobus_register(greth->mdio);
1341         if (ret) {
1342                 goto error;
1343         }
1344
1345         ret = greth_mdio_probe(greth->netdev);
1346         if (ret) {
1347                 if (netif_msg_probe(greth))
1348                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1349                 goto unreg_mdio;
1350         }
1351
1352         phy_start(greth->phy);
1353
1354         /* If Ethernet debug link is used make autoneg happen right away */
1355         if (greth->edcl && greth_edcl == 1) {
1356                 phy_start_aneg(greth->phy);
1357                 timeout = jiffies + 6*HZ;
1358                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1359                 }
1360                 genphy_read_status(greth->phy);
1361                 greth_link_change(greth->netdev);
1362         }
1363
1364         return 0;
1365
1366 unreg_mdio:
1367         mdiobus_unregister(greth->mdio);
1368 error:
1369         mdiobus_free(greth->mdio);
1370         return ret;
1371 }
1372
1373 /* Initialize the GRETH MAC */
1374 static int __devinit greth_of_probe(struct platform_device *ofdev)
1375 {
1376         struct net_device *dev;
1377         struct greth_private *greth;
1378         struct greth_regs *regs;
1379
1380         int i;
1381         int err;
1382         int tmp;
1383         unsigned long timeout;
1384
1385         dev = alloc_etherdev(sizeof(struct greth_private));
1386
1387         if (dev == NULL)
1388                 return -ENOMEM;
1389
1390         greth = netdev_priv(dev);
1391         greth->netdev = dev;
1392         greth->dev = &ofdev->dev;
1393
1394         if (greth_debug > 0)
1395                 greth->msg_enable = greth_debug;
1396         else
1397                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1398
1399         spin_lock_init(&greth->devlock);
1400
1401         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1402                                  resource_size(&ofdev->resource[0]),
1403                                  "grlib-greth regs");
1404
1405         if (greth->regs == NULL) {
1406                 if (netif_msg_probe(greth))
1407                         dev_err(greth->dev, "ioremap failure.\n");
1408                 err = -EIO;
1409                 goto error1;
1410         }
1411
1412         regs = (struct greth_regs *) greth->regs;
1413         greth->irq = ofdev->archdata.irqs[0];
1414
1415         dev_set_drvdata(greth->dev, dev);
1416         SET_NETDEV_DEV(dev, greth->dev);
1417
1418         if (netif_msg_probe(greth))
1419                 dev_dbg(greth->dev, "reseting controller.\n");
1420
1421         /* Reset the controller. */
1422         GRETH_REGSAVE(regs->control, GRETH_RESET);
1423
1424         /* Wait for MAC to reset itself */
1425         timeout = jiffies + HZ/100;
1426         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1427                 if (time_after(jiffies, timeout)) {
1428                         err = -EIO;
1429                         if (netif_msg_probe(greth))
1430                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1431                         goto error2;
1432                 }
1433         }
1434
1435         /* Get default PHY address  */
1436         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1437
1438         /* Check if we have GBIT capable MAC */
1439         tmp = GRETH_REGLOAD(regs->control);
1440         greth->gbit_mac = (tmp >> 27) & 1;
1441
1442         /* Check for multicast capability */
1443         greth->multicast = (tmp >> 25) & 1;
1444
1445         greth->edcl = (tmp >> 31) & 1;
1446
1447         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1448          * it doesn't interfere with the software */
1449         if (greth->edcl != 0)
1450                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1451
1452         /* Check if MAC can handle MDIO interrupts */
1453         greth->mdio_int_en = (tmp >> 26) & 1;
1454
1455         err = greth_mdio_init(greth);
1456         if (err) {
1457                 if (netif_msg_probe(greth))
1458                         dev_err(greth->dev, "failed to register MDIO bus\n");
1459                 goto error2;
1460         }
1461
1462         /* Allocate TX descriptor ring in coherent memory */
1463         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1464                                                                    1024,
1465                                                                    &greth->tx_bd_base_phys,
1466                                                                    GFP_KERNEL);
1467
1468         if (!greth->tx_bd_base) {
1469                 if (netif_msg_probe(greth))
1470                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1471                 err = -ENOMEM;
1472                 goto error3;
1473         }
1474
1475         memset(greth->tx_bd_base, 0, 1024);
1476
1477         /* Allocate RX descriptor ring in coherent memory */
1478         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1479                                                                    1024,
1480                                                                    &greth->rx_bd_base_phys,
1481                                                                    GFP_KERNEL);
1482
1483         if (!greth->rx_bd_base) {
1484                 if (netif_msg_probe(greth))
1485                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1486                 err = -ENOMEM;
1487                 goto error4;
1488         }
1489
1490         memset(greth->rx_bd_base, 0, 1024);
1491
1492         /* Get MAC address from: module param, OF property or ID prom */
1493         for (i = 0; i < 6; i++) {
1494                 if (macaddr[i] != 0)
1495                         break;
1496         }
1497         if (i == 6) {
1498                 const unsigned char *addr;
1499                 int len;
1500                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1501                                         &len);
1502                 if (addr != NULL && len == 6) {
1503                         for (i = 0; i < 6; i++)
1504                                 macaddr[i] = (unsigned int) addr[i];
1505                 } else {
1506 #ifdef CONFIG_SPARC
1507                         for (i = 0; i < 6; i++)
1508                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1509 #endif
1510                 }
1511         }
1512
1513         for (i = 0; i < 6; i++)
1514                 dev->dev_addr[i] = macaddr[i];
1515
1516         macaddr[5]++;
1517
1518         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1519                 if (netif_msg_probe(greth))
1520                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1521                 err = -EINVAL;
1522                 goto error5;
1523         }
1524
1525         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1526         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1527                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1528
1529         /* Clear all pending interrupts except PHY irq */
1530         GRETH_REGSAVE(regs->status, 0xFF);
1531
1532         if (greth->gbit_mac) {
1533                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1534                         NETIF_F_RXCSUM;
1535                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1536                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1537         }
1538
1539         if (greth->multicast) {
1540                 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1541                 dev->flags |= IFF_MULTICAST;
1542         } else {
1543                 dev->flags &= ~IFF_MULTICAST;
1544         }
1545
1546         dev->netdev_ops = &greth_netdev_ops;
1547         dev->ethtool_ops = &greth_ethtool_ops;
1548
1549         err = register_netdev(dev);
1550         if (err) {
1551                 if (netif_msg_probe(greth))
1552                         dev_err(greth->dev, "netdevice registration failed.\n");
1553                 goto error5;
1554         }
1555
1556         /* setup NAPI */
1557         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1558
1559         return 0;
1560
1561 error5:
1562         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1563 error4:
1564         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1565 error3:
1566         mdiobus_unregister(greth->mdio);
1567 error2:
1568         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1569 error1:
1570         free_netdev(dev);
1571         return err;
1572 }
1573
1574 static int __devexit greth_of_remove(struct platform_device *of_dev)
1575 {
1576         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1577         struct greth_private *greth = netdev_priv(ndev);
1578
1579         /* Free descriptor areas */
1580         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1581
1582         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1583
1584         dev_set_drvdata(&of_dev->dev, NULL);
1585
1586         if (greth->phy)
1587                 phy_stop(greth->phy);
1588         mdiobus_unregister(greth->mdio);
1589
1590         unregister_netdev(ndev);
1591         free_netdev(ndev);
1592
1593         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1594
1595         return 0;
1596 }
1597
1598 static struct of_device_id greth_of_match[] = {
1599         {
1600          .name = "GAISLER_ETHMAC",
1601          },
1602         {
1603          .name = "01_01d",
1604          },
1605         {},
1606 };
1607
1608 MODULE_DEVICE_TABLE(of, greth_of_match);
1609
1610 static struct platform_driver greth_of_driver = {
1611         .driver = {
1612                 .name = "grlib-greth",
1613                 .owner = THIS_MODULE,
1614                 .of_match_table = greth_of_match,
1615         },
1616         .probe = greth_of_probe,
1617         .remove = __devexit_p(greth_of_remove),
1618 };
1619
1620 static int __init greth_init(void)
1621 {
1622         return platform_driver_register(&greth_of_driver);
1623 }
1624
1625 static void __exit greth_cleanup(void)
1626 {
1627         platform_driver_unregister(&greth_of_driver);
1628 }
1629
1630 module_init(greth_init);
1631 module_exit(greth_cleanup);
1632
1633 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1634 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1635 MODULE_LICENSE("GPL");