drivers/net/ethernet/aeroflex/greth.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
   4  *
   5  * 2005-2010 (c) Aeroflex Gaisler AB
   6  *
   7  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
   8  * available in the GRLIB VHDL IP core library.
   9  *
  10  * Full documentation of both cores can be found here:
  11  * https://www.gaisler.com/products/grlib/grip.pdf
  12  *
  13  * The Gigabit version supports scatter/gather DMA, any alignment of
  14  * buffers and checksum offloading.
  15  *
  16  * Contributors: Kristoffer Glembo
  17  *               Daniel Hellstrom
  18  *               Marko Isomaki
  19  */
  20
  21 #include <linux/dma-mapping.h>
  22 #include <linux/module.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/io.h>
  30 #include <linux/crc32.h>
  31 #include <linux/mii.h>
  32 #include <linux/of.h>
  33 #include <linux/of_net.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/slab.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/byteorder.h>
  38
  39 #ifdef CONFIG_SPARC
  40 #include <asm/idprom.h>
  41 #endif
  42
  43 #include "greth.h"
  44
  45 #define GRETH_DEF_MSG_ENABLE      \
  46         (NETIF_MSG_DRV          | \
  47          NETIF_MSG_PROBE        | \
  48          NETIF_MSG_LINK         | \
  49          NETIF_MSG_IFDOWN       | \
  50          NETIF_MSG_IFUP         | \
  51          NETIF_MSG_RX_ERR       | \
  52          NETIF_MSG_TX_ERR)
  53
  54 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  55 module_param(greth_debug, int, 0);
  56 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  57
  58 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  59 static int macaddr[6];
  60 module_param_array(macaddr, int, NULL, 0);
  61 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  62
  63 static int greth_edcl = 1;
  64 module_param(greth_edcl, int, 0);
  65 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  66
  67 static int greth_open(struct net_device *dev);
  68 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  69            struct net_device *dev);
  70 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  71            struct net_device *dev);
  72 static int greth_rx(struct net_device *dev, int limit);
  73 static int greth_rx_gbit(struct net_device *dev, int limit);
  74 static void greth_clean_tx(struct net_device *dev);
  75 static void greth_clean_tx_gbit(struct net_device *dev);
  76 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  77 static int greth_close(struct net_device *dev);
  78 static int greth_set_mac_add(struct net_device *dev, void *p);
  79 static void greth_set_multicast_list(struct net_device *dev);
  80
  81 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  82 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  83 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  84 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  85
  86 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  87 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  88 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  89
  90 static void greth_print_rx_packet(void *addr, int len)
  91 {
  92         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  93                         addr, len, true);
  94 }
  95
  96 static void greth_print_tx_packet(struct sk_buff *skb)
  97 {
  98         int i;
  99         int length;
 100
 101         if (skb_shinfo(skb)->nr_frags == 0)
 102                 length = skb->len;
 103         else
 104                 length = skb_headlen(skb);
 105
 106         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 107                         skb->data, length, true);
 108
 109         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 110
 111                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 112                                skb_frag_address(&skb_shinfo(skb)->frags[i]),
 113                                skb_frag_size(&skb_shinfo(skb)->frags[i]), true);
 114         }
 115 }
 116
 117 static inline void greth_enable_tx(struct greth_private *greth)
 118 {
 119         wmb();
 120         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 121 }
 122
 123 static inline void greth_enable_tx_and_irq(struct greth_private *greth)
 124 {
 125         wmb(); /* BDs must been written to memory before enabling TX */
 126         GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
 127 }
 128
 129 static inline void greth_disable_tx(struct greth_private *greth)
 130 {
 131         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 132 }
 133
 134 static inline void greth_enable_rx(struct greth_private *greth)
 135 {
 136         wmb();
 137         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 138 }
 139
 140 static inline void greth_disable_rx(struct greth_private *greth)
 141 {
 142         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 143 }
 144
 145 static inline void greth_enable_irqs(struct greth_private *greth)
 146 {
 147         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 148 }
 149
 150 static inline void greth_disable_irqs(struct greth_private *greth)
 151 {
 152         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 153 }
 154
 155 static inline void greth_write_bd(u32 *bd, u32 val)
 156 {
 157         __raw_writel(cpu_to_be32(val), bd);
 158 }
 159
 160 static inline u32 greth_read_bd(u32 *bd)
 161 {
 162         return be32_to_cpu(__raw_readl(bd));
 163 }
 164
 165 static void greth_clean_rings(struct greth_private *greth)
 166 {
 167         int i;
 168         struct greth_bd *rx_bdp = greth->rx_bd_base;
 169         struct greth_bd *tx_bdp = greth->tx_bd_base;
 170
 171         if (greth->gbit_mac) {
 172
 173                 /* Free and unmap RX buffers */
 174                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 175                         if (greth->rx_skbuff[i] != NULL) {
 176                                 dev_kfree_skb(greth->rx_skbuff[i]);
 177                                 dma_unmap_single(greth->dev,
 178                                                  greth_read_bd(&rx_bdp->addr),
 179                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 180                                                  DMA_FROM_DEVICE);
 181                         }
 182                 }
 183
 184                 /* TX buffers */
 185                 while (greth->tx_free < GRETH_TXBD_NUM) {
 186
 187                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 188                         int nr_frags = skb_shinfo(skb)->nr_frags;
 189                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 190                         greth->tx_last = NEXT_TX(greth->tx_last);
 191
 192                         dma_unmap_single(greth->dev,
 193                                          greth_read_bd(&tx_bdp->addr),
 194                                          skb_headlen(skb),
 195                                          DMA_TO_DEVICE);
 196
 197                         for (i = 0; i < nr_frags; i++) {
 198                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 199                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 200
 201                                 dma_unmap_page(greth->dev,
 202                                                greth_read_bd(&tx_bdp->addr),
 203                                                skb_frag_size(frag),
 204                                                DMA_TO_DEVICE);
 205
 206                                 greth->tx_last = NEXT_TX(greth->tx_last);
 207                         }
 208                         greth->tx_free += nr_frags+1;
 209                         dev_kfree_skb(skb);
 210                 }
 211
 212
 213         } else { /* 10/100 Mbps MAC */
 214
 215                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 216                         kfree(greth->rx_bufs[i]);
 217                         dma_unmap_single(greth->dev,
 218                                          greth_read_bd(&rx_bdp->addr),
 219                                          MAX_FRAME_SIZE,
 220                                          DMA_FROM_DEVICE);
 221                 }
 222                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 223                         kfree(greth->tx_bufs[i]);
 224                         dma_unmap_single(greth->dev,
 225                                          greth_read_bd(&tx_bdp->addr),
 226                                          MAX_FRAME_SIZE,
 227                                          DMA_TO_DEVICE);
 228                 }
 229         }
 230 }
 231
 232 static int greth_init_rings(struct greth_private *greth)
 233 {
 234         struct sk_buff *skb;
 235         struct greth_bd *rx_bd, *tx_bd;
 236         u32 dma_addr;
 237         int i;
 238
 239         rx_bd = greth->rx_bd_base;
 240         tx_bd = greth->tx_bd_base;
 241
 242         /* Initialize descriptor rings and buffers */
 243         if (greth->gbit_mac) {
 244
 245                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 246                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 247                         if (skb == NULL) {
 248                                 if (netif_msg_ifup(greth))
 249                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 250                                 goto cleanup;
 251                         }
 252                         skb_reserve(skb, NET_IP_ALIGN);
 253                         dma_addr = dma_map_single(greth->dev,
 254                                                   skb->data,
 255                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 256                                                   DMA_FROM_DEVICE);
 257
 258                         if (dma_mapping_error(greth->dev, dma_addr)) {
 259                                 if (netif_msg_ifup(greth))
 260                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 261                                 dev_kfree_skb(skb);
 262                                 goto cleanup;
 263                         }
 264                         greth->rx_skbuff[i] = skb;
 265                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 266                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 267                 }
 268
 269         } else {
 270
 271                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 272                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 273
 274                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 275
 276                         if (greth->rx_bufs[i] == NULL) {
 277                                 if (netif_msg_ifup(greth))
 278                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 279                                 goto cleanup;
 280                         }
 281
 282                         dma_addr = dma_map_single(greth->dev,
 283                                                   greth->rx_bufs[i],
 284                                                   MAX_FRAME_SIZE,
 285                                                   DMA_FROM_DEVICE);
 286
 287                         if (dma_mapping_error(greth->dev, dma_addr)) {
 288                                 if (netif_msg_ifup(greth))
 289                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 290                                 goto cleanup;
 291                         }
 292                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 293                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 294                 }
 295                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 296
 297                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 298
 299                         if (greth->tx_bufs[i] == NULL) {
 300                                 if (netif_msg_ifup(greth))
 301                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 302                                 goto cleanup;
 303                         }
 304
 305                         dma_addr = dma_map_single(greth->dev,
 306                                                   greth->tx_bufs[i],
 307                                                   MAX_FRAME_SIZE,
 308                                                   DMA_TO_DEVICE);
 309
 310                         if (dma_mapping_error(greth->dev, dma_addr)) {
 311                                 if (netif_msg_ifup(greth))
 312                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 313                                 goto cleanup;
 314                         }
 315                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 316                         greth_write_bd(&tx_bd[i].stat, 0);
 317                 }
 318         }
 319         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 320                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 321
 322         /* Initialize pointers. */
 323         greth->rx_cur = 0;
 324         greth->tx_next = 0;
 325         greth->tx_last = 0;
 326         greth->tx_free = GRETH_TXBD_NUM;
 327
 328         /* Initialize descriptor base address */
 329         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 330         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 331
 332         return 0;
 333
 334 cleanup:
 335         greth_clean_rings(greth);
 336         return -ENOMEM;
 337 }
 338
 339 static int greth_open(struct net_device *dev)
 340 {
 341         struct greth_private *greth = netdev_priv(dev);
 342         int err;
 343
 344         err = greth_init_rings(greth);
 345         if (err) {
 346                 if (netif_msg_ifup(greth))
 347                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 348                 return err;
 349         }
 350
 351         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 352         if (err) {
 353                 if (netif_msg_ifup(greth))
 354                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 355                 greth_clean_rings(greth);
 356                 return err;
 357         }
 358
 359         if (netif_msg_ifup(greth))
 360                 dev_dbg(&dev->dev, " starting queue\n");
 361         netif_start_queue(dev);
 362
 363         GRETH_REGSAVE(greth->regs->status, 0xFF);
 364
 365         napi_enable(&greth->napi);
 366
 367         greth_enable_irqs(greth);
 368         greth_enable_tx(greth);
 369         greth_enable_rx(greth);
 370         return 0;
 371
 372 }
 373
 374 static int greth_close(struct net_device *dev)
 375 {
 376         struct greth_private *greth = netdev_priv(dev);
 377
 378         napi_disable(&greth->napi);
 379
 380         greth_disable_irqs(greth);
 381         greth_disable_tx(greth);
 382         greth_disable_rx(greth);
 383
 384         netif_stop_queue(dev);
 385
 386         free_irq(greth->irq, (void *) dev);
 387
 388         greth_clean_rings(greth);
 389
 390         return 0;
 391 }
 392
 393 static netdev_tx_t
 394 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 395 {
 396         struct greth_private *greth = netdev_priv(dev);
 397         struct greth_bd *bdp;
 398         int err = NETDEV_TX_OK;
 399         u32 status, dma_addr, ctrl;
 400         unsigned long flags;
 401
 402         /* Clean TX Ring */
 403         greth_clean_tx(greth->netdev);
 404
 405         if (unlikely(greth->tx_free <= 0)) {
 406                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 407                 ctrl = GRETH_REGLOAD(greth->regs->control);
 408                 /* Enable TX IRQ only if not already in poll() routine */
 409                 if (ctrl & GRETH_RXI)
 410                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 411                 netif_stop_queue(dev);
 412                 spin_unlock_irqrestore(&greth->devlock, flags);
 413                 return NETDEV_TX_BUSY;
 414         }
 415
 416         if (netif_msg_pktdata(greth))
 417                 greth_print_tx_packet(skb);
 418
 419
 420         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 421                 dev->stats.tx_errors++;
 422                 goto out;
 423         }
 424
 425         bdp = greth->tx_bd_base + greth->tx_next;
 426         dma_addr = greth_read_bd(&bdp->addr);
 427
 428         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 429
 430         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 431
 432         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 433         greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
 434
 435         /* Wrap around descriptor ring */
 436         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 437                 status |= GRETH_BD_WR;
 438         }
 439
 440         greth->tx_next = NEXT_TX(greth->tx_next);
 441         greth->tx_free--;
 442
 443         /* Write descriptor control word and enable transmission */
 444         greth_write_bd(&bdp->stat, status);
 445         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 446         greth_enable_tx(greth);
 447         spin_unlock_irqrestore(&greth->devlock, flags);
 448
 449 out:
 450         dev_kfree_skb(skb);
 451         return err;
 452 }
 453
 454 static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
 455 {
 456         if (tx_next < tx_last)
 457                 return (tx_last - tx_next) - 1;
 458         else
 459                 return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
 460 }
 461
 462 static netdev_tx_t
 463 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 464 {
 465         struct greth_private *greth = netdev_priv(dev);
 466         struct greth_bd *bdp;
 467         u32 status, dma_addr;
 468         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 469         unsigned long flags;
 470         u16 tx_last;
 471
 472         nr_frags = skb_shinfo(skb)->nr_frags;
 473         tx_last = greth->tx_last;
 474         rmb(); /* tx_last is updated by the poll task */
 475
 476         if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
 477                 netif_stop_queue(dev);
 478                 err = NETDEV_TX_BUSY;
 479                 goto out;
 480         }
 481
 482         if (netif_msg_pktdata(greth))
 483                 greth_print_tx_packet(skb);
 484
 485         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 486                 dev->stats.tx_errors++;
 487                 goto out;
 488         }
 489
 490         /* Save skb pointer. */
 491         greth->tx_skbuff[greth->tx_next] = skb;
 492
 493         /* Linear buf */
 494         if (nr_frags != 0)
 495                 status = GRETH_TXBD_MORE;
 496         else
 497                 status = GRETH_BD_IE;
 498
 499         if (skb->ip_summed == CHECKSUM_PARTIAL)
 500                 status |= GRETH_TXBD_CSALL;
 501         status |= skb_headlen(skb) & GRETH_BD_LEN;
 502         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 503                 status |= GRETH_BD_WR;
 504
 505
 506         bdp = greth->tx_bd_base + greth->tx_next;
 507         greth_write_bd(&bdp->stat, status);
 508         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 509
 510         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 511                 goto map_error;
 512
 513         greth_write_bd(&bdp->addr, dma_addr);
 514
 515         curr_tx = NEXT_TX(greth->tx_next);
 516
 517         /* Frags */
 518         for (i = 0; i < nr_frags; i++) {
 519                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 520                 greth->tx_skbuff[curr_tx] = NULL;
 521                 bdp = greth->tx_bd_base + curr_tx;
 522
 523                 status = GRETH_BD_EN;
 524                 if (skb->ip_summed == CHECKSUM_PARTIAL)
 525                         status |= GRETH_TXBD_CSALL;
 526                 status |= skb_frag_size(frag) & GRETH_BD_LEN;
 527
 528                 /* Wrap around descriptor ring */
 529                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 530                         status |= GRETH_BD_WR;
 531
 532                 /* More fragments left */
 533                 if (i < nr_frags - 1)
 534                         status |= GRETH_TXBD_MORE;
 535                 else
 536                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 537
 538                 greth_write_bd(&bdp->stat, status);
 539
 540                 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
 541                                             DMA_TO_DEVICE);
 542
 543                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 544                         goto frag_map_error;
 545
 546                 greth_write_bd(&bdp->addr, dma_addr);
 547
 548                 curr_tx = NEXT_TX(curr_tx);
 549         }
 550
 551         wmb();
 552
 553         /* Enable the descriptor chain by enabling the first descriptor */
 554         bdp = greth->tx_bd_base + greth->tx_next;
 555         greth_write_bd(&bdp->stat,
 556                        greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 557
 558         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 559         greth->tx_next = curr_tx;
 560         greth_enable_tx_and_irq(greth);
 561         spin_unlock_irqrestore(&greth->devlock, flags);
 562
 563         return NETDEV_TX_OK;
 564
 565 frag_map_error:
 566         /* Unmap SKB mappings that succeeded and disable descriptor */
 567         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 568                 bdp = greth->tx_bd_base + greth->tx_next + i;
 569                 dma_unmap_single(greth->dev,
 570                                  greth_read_bd(&bdp->addr),
 571                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 572                                  DMA_TO_DEVICE);
 573                 greth_write_bd(&bdp->stat, 0);
 574         }
 575 map_error:
 576         if (net_ratelimit())
 577                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 578         dev_kfree_skb(skb);
 579 out:
 580         return err;
 581 }
 582
 583 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 584 {
 585         struct net_device *dev = dev_id;
 586         struct greth_private *greth;
 587         u32 status, ctrl;
 588         irqreturn_t retval = IRQ_NONE;
 589
 590         greth = netdev_priv(dev);
 591
 592         spin_lock(&greth->devlock);
 593
 594         /* Get the interrupt events that caused us to be here. */
 595         status = GRETH_REGLOAD(greth->regs->status);
 596
 597         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 598          * set regardless of whether IRQ is enabled or not. Especially
 599          * important when shared IRQ.
 600          */
 601         ctrl = GRETH_REGLOAD(greth->regs->control);
 602
 603         /* Handle rx and tx interrupts through poll */
 604         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 605             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 606                 retval = IRQ_HANDLED;
 607
 608                 /* Disable interrupts and schedule poll() */
 609                 greth_disable_irqs(greth);
 610                 napi_schedule(&greth->napi);
 611         }
 612
 613         spin_unlock(&greth->devlock);
 614
 615         return retval;
 616 }
 617
 618 static void greth_clean_tx(struct net_device *dev)
 619 {
 620         struct greth_private *greth;
 621         struct greth_bd *bdp;
 622         u32 stat;
 623
 624         greth = netdev_priv(dev);
 625
 626         while (1) {
 627                 bdp = greth->tx_bd_base + greth->tx_last;
 628                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 629                 mb();
 630                 stat = greth_read_bd(&bdp->stat);
 631
 632                 if (unlikely(stat & GRETH_BD_EN))
 633                         break;
 634
 635                 if (greth->tx_free == GRETH_TXBD_NUM)
 636                         break;
 637
 638                 /* Check status for errors */
 639                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 640                         dev->stats.tx_errors++;
 641                         if (stat & GRETH_TXBD_ERR_AL)
 642                                 dev->stats.tx_aborted_errors++;
 643                         if (stat & GRETH_TXBD_ERR_UE)
 644                                 dev->stats.tx_fifo_errors++;
 645                 }
 646                 dev->stats.tx_packets++;
 647                 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
 648                 greth->tx_last = NEXT_TX(greth->tx_last);
 649                 greth->tx_free++;
 650         }
 651
 652         if (greth->tx_free > 0) {
 653                 netif_wake_queue(dev);
 654         }
 655 }
 656
 657 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 658 {
 659         /* Check status for errors */
 660         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 661                 dev->stats.tx_errors++;
 662                 if (stat & GRETH_TXBD_ERR_AL)
 663                         dev->stats.tx_aborted_errors++;
 664                 if (stat & GRETH_TXBD_ERR_UE)
 665                         dev->stats.tx_fifo_errors++;
 666                 if (stat & GRETH_TXBD_ERR_LC)
 667                         dev->stats.tx_aborted_errors++;
 668         }
 669         dev->stats.tx_packets++;
 670 }
 671
 672 static void greth_clean_tx_gbit(struct net_device *dev)
 673 {
 674         struct greth_private *greth;
 675         struct greth_bd *bdp, *bdp_last_frag;
 676         struct sk_buff *skb = NULL;
 677         u32 stat;
 678         int nr_frags, i;
 679         u16 tx_last;
 680
 681         greth = netdev_priv(dev);
 682         tx_last = greth->tx_last;
 683
 684         while (tx_last != greth->tx_next) {
 685
 686                 skb = greth->tx_skbuff[tx_last];
 687
 688                 nr_frags = skb_shinfo(skb)->nr_frags;
 689
 690                 /* We only clean fully completed SKBs */
 691                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
 692
 693                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 694                 mb();
 695                 stat = greth_read_bd(&bdp_last_frag->stat);
 696
 697                 if (stat & GRETH_BD_EN)
 698                         break;
 699
 700                 greth->tx_skbuff[tx_last] = NULL;
 701
 702                 greth_update_tx_stats(dev, stat);
 703                 dev->stats.tx_bytes += skb->len;
 704
 705                 bdp = greth->tx_bd_base + tx_last;
 706
 707                 tx_last = NEXT_TX(tx_last);
 708
 709                 dma_unmap_single(greth->dev,
 710                                  greth_read_bd(&bdp->addr),
 711                                  skb_headlen(skb),
 712                                  DMA_TO_DEVICE);
 713
 714                 for (i = 0; i < nr_frags; i++) {
 715                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 716                         bdp = greth->tx_bd_base + tx_last;
 717
 718                         dma_unmap_page(greth->dev,
 719                                        greth_read_bd(&bdp->addr),
 720                                        skb_frag_size(frag),
 721                                        DMA_TO_DEVICE);
 722
 723                         tx_last = NEXT_TX(tx_last);
 724                 }
 725                 dev_kfree_skb(skb);
 726         }
 727         if (skb) { /* skb is set only if the above while loop was entered */
 728                 wmb();
 729                 greth->tx_last = tx_last;
 730
 731                 if (netif_queue_stopped(dev) &&
 732                     (greth_num_free_bds(tx_last, greth->tx_next) >
 733                     (MAX_SKB_FRAGS+1)))
 734                         netif_wake_queue(dev);
 735         }
 736 }
 737
 738 static int greth_rx(struct net_device *dev, int limit)
 739 {
 740         struct greth_private *greth;
 741         struct greth_bd *bdp;
 742         struct sk_buff *skb;
 743         int pkt_len;
 744         int bad, count;
 745         u32 status, dma_addr;
 746         unsigned long flags;
 747
 748         greth = netdev_priv(dev);
 749
 750         for (count = 0; count < limit; ++count) {
 751
 752                 bdp = greth->rx_bd_base + greth->rx_cur;
 753                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 754                 mb();
 755                 status = greth_read_bd(&bdp->stat);
 756
 757                 if (unlikely(status & GRETH_BD_EN)) {
 758                         break;
 759                 }
 760
 761                 dma_addr = greth_read_bd(&bdp->addr);
 762                 bad = 0;
 763
 764                 /* Check status for errors. */
 765                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 766                         if (status & GRETH_RXBD_ERR_FT) {
 767                                 dev->stats.rx_length_errors++;
 768                                 bad = 1;
 769                         }
 770                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 771                                 dev->stats.rx_frame_errors++;
 772                                 bad = 1;
 773                         }
 774                         if (status & GRETH_RXBD_ERR_CRC) {
 775                                 dev->stats.rx_crc_errors++;
 776                                 bad = 1;
 777                         }
 778                 }
 779                 if (unlikely(bad)) {
 780                         dev->stats.rx_errors++;
 781
 782                 } else {
 783
 784                         pkt_len = status & GRETH_BD_LEN;
 785
 786                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 787
 788                         if (unlikely(skb == NULL)) {
 789
 790                                 if (net_ratelimit())
 791                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 792
 793                                 dev->stats.rx_dropped++;
 794
 795                         } else {
 796                                 skb_reserve(skb, NET_IP_ALIGN);
 797
 798                                 dma_sync_single_for_cpu(greth->dev,
 799                                                         dma_addr,
 800                                                         pkt_len,
 801                                                         DMA_FROM_DEVICE);
 802
 803                                 if (netif_msg_pktdata(greth))
 804                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 805
 806                                 skb_put_data(skb, phys_to_virt(dma_addr),
 807                                              pkt_len);
 808
 809                                 skb->protocol = eth_type_trans(skb, dev);
 810                                 dev->stats.rx_bytes += pkt_len;
 811                                 dev->stats.rx_packets++;
 812                                 netif_receive_skb(skb);
 813                         }
 814                 }
 815
 816                 status = GRETH_BD_EN | GRETH_BD_IE;
 817                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 818                         status |= GRETH_BD_WR;
 819                 }
 820
 821                 wmb();
 822                 greth_write_bd(&bdp->stat, status);
 823
 824                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 825
 826                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 827                 greth_enable_rx(greth);
 828                 spin_unlock_irqrestore(&greth->devlock, flags);
 829
 830                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 831         }
 832
 833         return count;
 834 }
 835
 836 static inline int hw_checksummed(u32 status)
 837 {
 838
 839         if (status & GRETH_RXBD_IP_FRAG)
 840                 return 0;
 841
 842         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 843                 return 0;
 844
 845         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 846                 return 0;
 847
 848         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 849                 return 0;
 850
 851         return 1;
 852 }
 853
 854 static int greth_rx_gbit(struct net_device *dev, int limit)
 855 {
 856         struct greth_private *greth;
 857         struct greth_bd *bdp;
 858         struct sk_buff *skb, *newskb;
 859         int pkt_len;
 860         int bad, count = 0;
 861         u32 status, dma_addr;
 862         unsigned long flags;
 863
 864         greth = netdev_priv(dev);
 865
 866         for (count = 0; count < limit; ++count) {
 867
 868                 bdp = greth->rx_bd_base + greth->rx_cur;
 869                 skb = greth->rx_skbuff[greth->rx_cur];
 870                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 871                 mb();
 872                 status = greth_read_bd(&bdp->stat);
 873                 bad = 0;
 874
 875                 if (status & GRETH_BD_EN)
 876                         break;
 877
 878                 /* Check status for errors. */
 879                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 880
 881                         if (status & GRETH_RXBD_ERR_FT) {
 882                                 dev->stats.rx_length_errors++;
 883                                 bad = 1;
 884                         } else if (status &
 885                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 886                                 dev->stats.rx_frame_errors++;
 887                                 bad = 1;
 888                         } else if (status & GRETH_RXBD_ERR_CRC) {
 889                                 dev->stats.rx_crc_errors++;
 890                                 bad = 1;
 891                         }
 892                 }
 893
 894                 /* Allocate new skb to replace current, not needed if the
 895                  * current skb can be reused */
 896                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 897                         skb_reserve(newskb, NET_IP_ALIGN);
 898
 899                         dma_addr = dma_map_single(greth->dev,
 900                                                       newskb->data,
 901                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 902                                                       DMA_FROM_DEVICE);
 903
 904                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 905                                 /* Process the incoming frame. */
 906                                 pkt_len = status & GRETH_BD_LEN;
 907
 908                                 dma_unmap_single(greth->dev,
 909                                                  greth_read_bd(&bdp->addr),
 910                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 911                                                  DMA_FROM_DEVICE);
 912
 913                                 if (netif_msg_pktdata(greth))
 914                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 915
 916                                 skb_put(skb, pkt_len);
 917
 918                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 919                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 920                                 else
 921                                         skb_checksum_none_assert(skb);
 922
 923                                 skb->protocol = eth_type_trans(skb, dev);
 924                                 dev->stats.rx_packets++;
 925                                 dev->stats.rx_bytes += pkt_len;
 926                                 netif_receive_skb(skb);
 927
 928                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 929                                 greth_write_bd(&bdp->addr, dma_addr);
 930                         } else {
 931                                 if (net_ratelimit())
 932                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 933                                 dev_kfree_skb(newskb);
 934                                 /* reusing current skb, so it is a drop */
 935                                 dev->stats.rx_dropped++;
 936                         }
 937                 } else if (bad) {
 938                         /* Bad Frame transfer, the skb is reused */
 939                         dev->stats.rx_dropped++;
 940                 } else {
 941                         /* Failed Allocating a new skb. This is rather stupid
 942                          * but the current "filled" skb is reused, as if
 943                          * transfer failure. One could argue that RX descriptor
 944                          * table handling should be divided into cleaning and
 945                          * filling as the TX part of the driver
 946                          */
 947                         if (net_ratelimit())
 948                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 949                         /* reusing current skb, so it is a drop */
 950                         dev->stats.rx_dropped++;
 951                 }
 952
 953                 status = GRETH_BD_EN | GRETH_BD_IE;
 954                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 955                         status |= GRETH_BD_WR;
 956                 }
 957
 958                 wmb();
 959                 greth_write_bd(&bdp->stat, status);
 960                 spin_lock_irqsave(&greth->devlock, flags);
 961                 greth_enable_rx(greth);
 962                 spin_unlock_irqrestore(&greth->devlock, flags);
 963                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 964         }
 965
 966         return count;
 967
 968 }
 969
 970 static int greth_poll(struct napi_struct *napi, int budget)
 971 {
 972         struct greth_private *greth;
 973         int work_done = 0;
 974         unsigned long flags;
 975         u32 mask, ctrl;
 976         greth = container_of(napi, struct greth_private, napi);
 977
 978 restart_txrx_poll:
 979         if (greth->gbit_mac) {
 980                 greth_clean_tx_gbit(greth->netdev);
 981                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 982         } else {
 983                 if (netif_queue_stopped(greth->netdev))
 984                         greth_clean_tx(greth->netdev);
 985                 work_done += greth_rx(greth->netdev, budget - work_done);
 986         }
 987
 988         if (work_done < budget) {
 989
 990                 spin_lock_irqsave(&greth->devlock, flags);
 991
 992                 ctrl = GRETH_REGLOAD(greth->regs->control);
 993                 if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
 994                     (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
 995                         GRETH_REGSAVE(greth->regs->control,
 996                                         ctrl | GRETH_TXI | GRETH_RXI);
 997                         mask = GRETH_INT_RX | GRETH_INT_RE |
 998                                GRETH_INT_TX | GRETH_INT_TE;
 999                 } else {
1000                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
1001                         mask = GRETH_INT_RX | GRETH_INT_RE;
1002                 }
1003
1004                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1005                         GRETH_REGSAVE(greth->regs->control, ctrl);
1006                         spin_unlock_irqrestore(&greth->devlock, flags);
1007                         goto restart_txrx_poll;
1008                 } else {
1009                         napi_complete_done(napi, work_done);
1010                         spin_unlock_irqrestore(&greth->devlock, flags);
1011                 }
1012         }
1013
1014         return work_done;
1015 }
1016
1017 static int greth_set_mac_add(struct net_device *dev, void *p)
1018 {
1019         struct sockaddr *addr = p;
1020         struct greth_private *greth;
1021         struct greth_regs *regs;
1022
1023         greth = netdev_priv(dev);
1024         regs = greth->regs;
1025
1026         if (!is_valid_ether_addr(addr->sa_data))
1027                 return -EADDRNOTAVAIL;
1028
1029         eth_hw_addr_set(dev, addr->sa_data);
1030         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1031         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1032                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1033
1034         return 0;
1035 }
1036
1037 static u32 greth_hash_get_index(__u8 *addr)
1038 {
1039         return (ether_crc(6, addr)) & 0x3F;
1040 }
1041
1042 static void greth_set_hash_filter(struct net_device *dev)
1043 {
1044         struct netdev_hw_addr *ha;
1045         struct greth_private *greth = netdev_priv(dev);
1046         struct greth_regs *regs = greth->regs;
1047         u32 mc_filter[2];
1048         unsigned int bitnr;
1049
1050         mc_filter[0] = mc_filter[1] = 0;
1051
1052         netdev_for_each_mc_addr(ha, dev) {
1053                 bitnr = greth_hash_get_index(ha->addr);
1054                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1055         }
1056
1057         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1058         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1059 }
1060
1061 static void greth_set_multicast_list(struct net_device *dev)
1062 {
1063         int cfg;
1064         struct greth_private *greth = netdev_priv(dev);
1065         struct greth_regs *regs = greth->regs;
1066
1067         cfg = GRETH_REGLOAD(regs->control);
1068         if (dev->flags & IFF_PROMISC)
1069                 cfg |= GRETH_CTRL_PR;
1070         else
1071                 cfg &= ~GRETH_CTRL_PR;
1072
1073         if (greth->multicast) {
1074                 if (dev->flags & IFF_ALLMULTI) {
1075                         GRETH_REGSAVE(regs->hash_msb, -1);
1076                         GRETH_REGSAVE(regs->hash_lsb, -1);
1077                         cfg |= GRETH_CTRL_MCEN;
1078                         GRETH_REGSAVE(regs->control, cfg);
1079                         return;
1080                 }
1081
1082                 if (netdev_mc_empty(dev)) {
1083                         cfg &= ~GRETH_CTRL_MCEN;
1084                         GRETH_REGSAVE(regs->control, cfg);
1085                         return;
1086                 }
1087
1088                 /* Setup multicast filter */
1089                 greth_set_hash_filter(dev);
1090                 cfg |= GRETH_CTRL_MCEN;
1091         }
1092         GRETH_REGSAVE(regs->control, cfg);
1093 }
1094
1095 static u32 greth_get_msglevel(struct net_device *dev)
1096 {
1097         struct greth_private *greth = netdev_priv(dev);
1098         return greth->msg_enable;
1099 }
1100
1101 static void greth_set_msglevel(struct net_device *dev, u32 value)
1102 {
1103         struct greth_private *greth = netdev_priv(dev);
1104         greth->msg_enable = value;
1105 }
1106
1107 static int greth_get_regs_len(struct net_device *dev)
1108 {
1109         return sizeof(struct greth_regs);
1110 }
1111
1112 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1113 {
1114         struct greth_private *greth = netdev_priv(dev);
1115
1116         strscpy(info->driver, dev_driver_string(greth->dev),
1117                 sizeof(info->driver));
1118         strscpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1119 }
1120
1121 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1122 {
1123         int i;
1124         struct greth_private *greth = netdev_priv(dev);
1125         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1126         u32 *buff = p;
1127
1128         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1129                 buff[i] = greth_read_bd(&greth_regs[i]);
1130 }
1131
1132 static const struct ethtool_ops greth_ethtool_ops = {
1133         .get_msglevel           = greth_get_msglevel,
1134         .set_msglevel           = greth_set_msglevel,
1135         .get_drvinfo            = greth_get_drvinfo,
1136         .get_regs_len           = greth_get_regs_len,
1137         .get_regs               = greth_get_regs,
1138         .get_link               = ethtool_op_get_link,
1139         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
1140         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
1141 };
1142
1143 static struct net_device_ops greth_netdev_ops = {
1144         .ndo_open               = greth_open,
1145         .ndo_stop               = greth_close,
1146         .ndo_start_xmit         = greth_start_xmit,
1147         .ndo_set_mac_address    = greth_set_mac_add,
1148         .ndo_validate_addr      = eth_validate_addr,
1149 };
1150
1151 static inline int wait_for_mdio(struct greth_private *greth)
1152 {
1153         unsigned long timeout = jiffies + 4*HZ/100;
1154         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1155                 if (time_after(jiffies, timeout))
1156                         return 0;
1157         }
1158         return 1;
1159 }
1160
1161 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1162 {
1163         struct greth_private *greth = bus->priv;
1164         int data;
1165
1166         if (!wait_for_mdio(greth))
1167                 return -EBUSY;
1168
1169         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1170
1171         if (!wait_for_mdio(greth))
1172                 return -EBUSY;
1173
1174         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1175                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1176                 return data;
1177
1178         } else {
1179                 return -1;
1180         }
1181 }
1182
1183 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1184 {
1185         struct greth_private *greth = bus->priv;
1186
1187         if (!wait_for_mdio(greth))
1188                 return -EBUSY;
1189
1190         GRETH_REGSAVE(greth->regs->mdio,
1191                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1192
1193         if (!wait_for_mdio(greth))
1194                 return -EBUSY;
1195
1196         return 0;
1197 }
1198
1199 static void greth_link_change(struct net_device *dev)
1200 {
1201         struct greth_private *greth = netdev_priv(dev);
1202         struct phy_device *phydev = dev->phydev;
1203         unsigned long flags;
1204         int status_change = 0;
1205         u32 ctrl;
1206
1207         spin_lock_irqsave(&greth->devlock, flags);
1208
1209         if (phydev->link) {
1210
1211                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1212                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1213                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1214
1215                         if (phydev->duplex)
1216                                 ctrl |= GRETH_CTRL_FD;
1217
1218                         if (phydev->speed == SPEED_100)
1219                                 ctrl |= GRETH_CTRL_SP;
1220                         else if (phydev->speed == SPEED_1000)
1221                                 ctrl |= GRETH_CTRL_GB;
1222
1223                         GRETH_REGSAVE(greth->regs->control, ctrl);
1224                         greth->speed = phydev->speed;
1225                         greth->duplex = phydev->duplex;
1226                         status_change = 1;
1227                 }
1228         }
1229
1230         if (phydev->link != greth->link) {
1231                 if (!phydev->link) {
1232                         greth->speed = 0;
1233                         greth->duplex = -1;
1234                 }
1235                 greth->link = phydev->link;
1236
1237                 status_change = 1;
1238         }
1239
1240         spin_unlock_irqrestore(&greth->devlock, flags);
1241
1242         if (status_change) {
1243                 if (phydev->link)
1244                         pr_debug("%s: link up (%d/%s)\n",
1245                                 dev->name, phydev->speed,
1246                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1247                 else
1248                         pr_debug("%s: link down\n", dev->name);
1249         }
1250 }
1251
1252 static int greth_mdio_probe(struct net_device *dev)
1253 {
1254         struct greth_private *greth = netdev_priv(dev);
1255         struct phy_device *phy = NULL;
1256         int ret;
1257
1258         /* Find the first PHY */
1259         phy = phy_find_first(greth->mdio);
1260
1261         if (!phy) {
1262                 if (netif_msg_probe(greth))
1263                         dev_err(&dev->dev, "no PHY found\n");
1264                 return -ENXIO;
1265         }
1266
1267         ret = phy_connect_direct(dev, phy, &greth_link_change,
1268                                  greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1269         if (ret) {
1270                 if (netif_msg_ifup(greth))
1271                         dev_err(&dev->dev, "could not attach to PHY\n");
1272                 return ret;
1273         }
1274
1275         if (greth->gbit_mac)
1276                 phy_set_max_speed(phy, SPEED_1000);
1277         else
1278                 phy_set_max_speed(phy, SPEED_100);
1279
1280         linkmode_copy(phy->advertising, phy->supported);
1281
1282         greth->link = 0;
1283         greth->speed = 0;
1284         greth->duplex = -1;
1285
1286         return 0;
1287 }
1288
1289 static int greth_mdio_init(struct greth_private *greth)
1290 {
1291         int ret;
1292         unsigned long timeout;
1293         struct net_device *ndev = greth->netdev;
1294
1295         greth->mdio = mdiobus_alloc();
1296         if (!greth->mdio) {
1297                 return -ENOMEM;
1298         }
1299
1300         greth->mdio->name = "greth-mdio";
1301         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1302         greth->mdio->read = greth_mdio_read;
1303         greth->mdio->write = greth_mdio_write;
1304         greth->mdio->priv = greth;
1305
1306         ret = mdiobus_register(greth->mdio);
1307         if (ret) {
1308                 goto error;
1309         }
1310
1311         ret = greth_mdio_probe(greth->netdev);
1312         if (ret) {
1313                 if (netif_msg_probe(greth))
1314                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1315                 goto unreg_mdio;
1316         }
1317
1318         phy_start(ndev->phydev);
1319
1320         /* If Ethernet debug link is used make autoneg happen right away */
1321         if (greth->edcl && greth_edcl == 1) {
1322                 phy_start_aneg(ndev->phydev);
1323                 timeout = jiffies + 6*HZ;
1324                 while (!phy_aneg_done(ndev->phydev) &&
1325                        time_before(jiffies, timeout)) {
1326                 }
1327                 phy_read_status(ndev->phydev);
1328                 greth_link_change(greth->netdev);
1329         }
1330
1331         return 0;
1332
1333 unreg_mdio:
1334         mdiobus_unregister(greth->mdio);
1335 error:
1336         mdiobus_free(greth->mdio);
1337         return ret;
1338 }
1339
1340 /* Initialize the GRETH MAC */
1341 static int greth_of_probe(struct platform_device *ofdev)
1342 {
1343         struct net_device *dev;
1344         struct greth_private *greth;
1345         struct greth_regs *regs;
1346
1347         int i;
1348         int err;
1349         int tmp;
1350         u8 addr[ETH_ALEN];
1351         unsigned long timeout;
1352
1353         dev = alloc_etherdev(sizeof(struct greth_private));
1354
1355         if (dev == NULL)
1356                 return -ENOMEM;
1357
1358         greth = netdev_priv(dev);
1359         greth->netdev = dev;
1360         greth->dev = &ofdev->dev;
1361
1362         if (greth_debug > 0)
1363                 greth->msg_enable = greth_debug;
1364         else
1365                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1366
1367         spin_lock_init(&greth->devlock);
1368
1369         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1370                                  resource_size(&ofdev->resource[0]),
1371                                  "grlib-greth regs");
1372
1373         if (greth->regs == NULL) {
1374                 if (netif_msg_probe(greth))
1375                         dev_err(greth->dev, "ioremap failure.\n");
1376                 err = -EIO;
1377                 goto error1;
1378         }
1379
1380         regs = greth->regs;
1381         greth->irq = ofdev->archdata.irqs[0];
1382
1383         dev_set_drvdata(greth->dev, dev);
1384         SET_NETDEV_DEV(dev, greth->dev);
1385
1386         if (netif_msg_probe(greth))
1387                 dev_dbg(greth->dev, "resetting controller.\n");
1388
1389         /* Reset the controller. */
1390         GRETH_REGSAVE(regs->control, GRETH_RESET);
1391
1392         /* Wait for MAC to reset itself */
1393         timeout = jiffies + HZ/100;
1394         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1395                 if (time_after(jiffies, timeout)) {
1396                         err = -EIO;
1397                         if (netif_msg_probe(greth))
1398                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1399                         goto error2;
1400                 }
1401         }
1402
1403         /* Get default PHY address  */
1404         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1405
1406         /* Check if we have GBIT capable MAC */
1407         tmp = GRETH_REGLOAD(regs->control);
1408         greth->gbit_mac = (tmp >> 27) & 1;
1409
1410         /* Check for multicast capability */
1411         greth->multicast = (tmp >> 25) & 1;
1412
1413         greth->edcl = (tmp >> 31) & 1;
1414
1415         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1416          * it doesn't interfere with the software */
1417         if (greth->edcl != 0)
1418                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1419
1420         /* Check if MAC can handle MDIO interrupts */
1421         greth->mdio_int_en = (tmp >> 26) & 1;
1422
1423         err = greth_mdio_init(greth);
1424         if (err) {
1425                 if (netif_msg_probe(greth))
1426                         dev_err(greth->dev, "failed to register MDIO bus\n");
1427                 goto error2;
1428         }
1429
1430         /* Allocate TX descriptor ring in coherent memory */
1431         greth->tx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1432                                                &greth->tx_bd_base_phys,
1433                                                GFP_KERNEL);
1434         if (!greth->tx_bd_base) {
1435                 err = -ENOMEM;
1436                 goto error3;
1437         }
1438
1439         /* Allocate RX descriptor ring in coherent memory */
1440         greth->rx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1441                                                &greth->rx_bd_base_phys,
1442                                                GFP_KERNEL);
1443         if (!greth->rx_bd_base) {
1444                 err = -ENOMEM;
1445                 goto error4;
1446         }
1447
1448         /* Get MAC address from: module param, OF property or ID prom */
1449         for (i = 0; i < 6; i++) {
1450                 if (macaddr[i] != 0)
1451                         break;
1452         }
1453         if (i == 6) {
1454                 err = of_get_mac_address(ofdev->dev.of_node, addr);
1455                 if (!err) {
1456                         for (i = 0; i < 6; i++)
1457                                 macaddr[i] = (unsigned int) addr[i];
1458                 } else {
1459 #ifdef CONFIG_SPARC
1460                         for (i = 0; i < 6; i++)
1461                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1462 #endif
1463                 }
1464         }
1465
1466         for (i = 0; i < 6; i++)
1467                 addr[i] = macaddr[i];
1468         eth_hw_addr_set(dev, addr);
1469
1470         macaddr[5]++;
1471
1472         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1473                 if (netif_msg_probe(greth))
1474                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1475                 err = -EINVAL;
1476                 goto error5;
1477         }
1478
1479         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1480         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1481                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1482
1483         /* Clear all pending interrupts except PHY irq */
1484         GRETH_REGSAVE(regs->status, 0xFF);
1485
1486         if (greth->gbit_mac) {
1487                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1488                         NETIF_F_RXCSUM;
1489                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1490                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1491         }
1492
1493         if (greth->multicast) {
1494                 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1495                 dev->flags |= IFF_MULTICAST;
1496         } else {
1497                 dev->flags &= ~IFF_MULTICAST;
1498         }
1499
1500         dev->netdev_ops = &greth_netdev_ops;
1501         dev->ethtool_ops = &greth_ethtool_ops;
1502
1503         err = register_netdev(dev);
1504         if (err) {
1505                 if (netif_msg_probe(greth))
1506                         dev_err(greth->dev, "netdevice registration failed.\n");
1507                 goto error5;
1508         }
1509
1510         /* setup NAPI */
1511         netif_napi_add(dev, &greth->napi, greth_poll);
1512
1513         return 0;
1514
1515 error5:
1516         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1517 error4:
1518         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1519 error3:
1520         mdiobus_unregister(greth->mdio);
1521 error2:
1522         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1523 error1:
1524         free_netdev(dev);
1525         return err;
1526 }
1527
1528 static void greth_of_remove(struct platform_device *of_dev)
1529 {
1530         struct net_device *ndev = platform_get_drvdata(of_dev);
1531         struct greth_private *greth = netdev_priv(ndev);
1532
1533         /* Free descriptor areas */
1534         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1535
1536         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1537
1538         if (ndev->phydev)
1539                 phy_stop(ndev->phydev);
1540         mdiobus_unregister(greth->mdio);
1541
1542         unregister_netdev(ndev);
1543
1544         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1545
1546         free_netdev(ndev);
1547 }
1548
1549 static const struct of_device_id greth_of_match[] = {
1550         {
1551          .name = "GAISLER_ETHMAC",
1552          },
1553         {
1554          .name = "01_01d",
1555          },
1556         {},
1557 };
1558
1559 MODULE_DEVICE_TABLE(of, greth_of_match);
1560
1561 static struct platform_driver greth_of_driver = {
1562         .driver = {
1563                 .name = "grlib-greth",
1564                 .of_match_table = greth_of_match,
1565         },
1566         .probe = greth_of_probe,
1567         .remove_new = greth_of_remove,
1568 };
1569
1570 module_platform_driver(greth_of_driver);
1571
1572 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1573 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1574 MODULE_LICENSE("GPL");