drivers/net/ethernet/aeroflex/greth.c

   1 /*
   2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
   3  *
   4  * 2005-2010 (c) Aeroflex Gaisler AB
   5  *
   6  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
   7  * available in the GRLIB VHDL IP core library.
   8  *
   9  * Full documentation of both cores can be found here:
  10  * http://www.gaisler.com/products/grlib/grip.pdf
  11  *
  12  * The Gigabit version supports scatter/gather DMA, any alignment of
  13  * buffers and checksum offloading.
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the
  17  * Free Software Foundation; either version 2 of the License, or (at your
  18  * option) any later version.
  19  *
  20  * Contributors: Kristoffer Glembo
  21  *               Daniel Hellstrom
  22  *               Marko Isomaki
  23  */
  24
  25 #include <linux/dma-mapping.h>
  26 #include <linux/module.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/io.h>
  34 #include <linux/crc32.h>
  35 #include <linux/mii.h>
  36 #include <linux/of_device.h>
  37 #include <linux/of_net.h>
  38 #include <linux/of_platform.h>
  39 #include <linux/slab.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/byteorder.h>
  42
  43 #ifdef CONFIG_SPARC
  44 #include <asm/idprom.h>
  45 #endif
  46
  47 #include "greth.h"
  48
  49 #define GRETH_DEF_MSG_ENABLE      \
  50         (NETIF_MSG_DRV          | \
  51          NETIF_MSG_PROBE        | \
  52          NETIF_MSG_LINK         | \
  53          NETIF_MSG_IFDOWN       | \
  54          NETIF_MSG_IFUP         | \
  55          NETIF_MSG_RX_ERR       | \
  56          NETIF_MSG_TX_ERR)
  57
  58 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  59 module_param(greth_debug, int, 0);
  60 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  61
  62 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  63 static int macaddr[6];
  64 module_param_array(macaddr, int, NULL, 0);
  65 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  66
  67 static int greth_edcl = 1;
  68 module_param(greth_edcl, int, 0);
  69 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  70
  71 static int greth_open(struct net_device *dev);
  72 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  73            struct net_device *dev);
  74 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  75            struct net_device *dev);
  76 static int greth_rx(struct net_device *dev, int limit);
  77 static int greth_rx_gbit(struct net_device *dev, int limit);
  78 static void greth_clean_tx(struct net_device *dev);
  79 static void greth_clean_tx_gbit(struct net_device *dev);
  80 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  81 static int greth_close(struct net_device *dev);
  82 static int greth_set_mac_add(struct net_device *dev, void *p);
  83 static void greth_set_multicast_list(struct net_device *dev);
  84
  85 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  86 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  87 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  88 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  89
  90 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  91 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  92 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  93
  94 static void greth_print_rx_packet(void *addr, int len)
  95 {
  96         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  97                         addr, len, true);
  98 }
  99
 100 static void greth_print_tx_packet(struct sk_buff *skb)
 101 {
 102         int i;
 103         int length;
 104
 105         if (skb_shinfo(skb)->nr_frags == 0)
 106                 length = skb->len;
 107         else
 108                 length = skb_headlen(skb);
 109
 110         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 111                         skb->data, length, true);
 112
 113         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 114
 115                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 116                                skb_frag_address(&skb_shinfo(skb)->frags[i]),
 117                                skb_shinfo(skb)->frags[i].size, true);
 118         }
 119 }
 120
 121 static inline void greth_enable_tx(struct greth_private *greth)
 122 {
 123         wmb();
 124         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 125 }
 126
 127 static inline void greth_enable_tx_and_irq(struct greth_private *greth)
 128 {
 129         wmb(); /* BDs must been written to memory before enabling TX */
 130         GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
 131 }
 132
 133 static inline void greth_disable_tx(struct greth_private *greth)
 134 {
 135         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 136 }
 137
 138 static inline void greth_enable_rx(struct greth_private *greth)
 139 {
 140         wmb();
 141         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 142 }
 143
 144 static inline void greth_disable_rx(struct greth_private *greth)
 145 {
 146         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 147 }
 148
 149 static inline void greth_enable_irqs(struct greth_private *greth)
 150 {
 151         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 152 }
 153
 154 static inline void greth_disable_irqs(struct greth_private *greth)
 155 {
 156         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 157 }
 158
 159 static inline void greth_write_bd(u32 *bd, u32 val)
 160 {
 161         __raw_writel(cpu_to_be32(val), bd);
 162 }
 163
 164 static inline u32 greth_read_bd(u32 *bd)
 165 {
 166         return be32_to_cpu(__raw_readl(bd));
 167 }
 168
 169 static void greth_clean_rings(struct greth_private *greth)
 170 {
 171         int i;
 172         struct greth_bd *rx_bdp = greth->rx_bd_base;
 173         struct greth_bd *tx_bdp = greth->tx_bd_base;
 174
 175         if (greth->gbit_mac) {
 176
 177                 /* Free and unmap RX buffers */
 178                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 179                         if (greth->rx_skbuff[i] != NULL) {
 180                                 dev_kfree_skb(greth->rx_skbuff[i]);
 181                                 dma_unmap_single(greth->dev,
 182                                                  greth_read_bd(&rx_bdp->addr),
 183                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 184                                                  DMA_FROM_DEVICE);
 185                         }
 186                 }
 187
 188                 /* TX buffers */
 189                 while (greth->tx_free < GRETH_TXBD_NUM) {
 190
 191                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 192                         int nr_frags = skb_shinfo(skb)->nr_frags;
 193                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 194                         greth->tx_last = NEXT_TX(greth->tx_last);
 195
 196                         dma_unmap_single(greth->dev,
 197                                          greth_read_bd(&tx_bdp->addr),
 198                                          skb_headlen(skb),
 199                                          DMA_TO_DEVICE);
 200
 201                         for (i = 0; i < nr_frags; i++) {
 202                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 203                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 204
 205                                 dma_unmap_page(greth->dev,
 206                                                greth_read_bd(&tx_bdp->addr),
 207                                                skb_frag_size(frag),
 208                                                DMA_TO_DEVICE);
 209
 210                                 greth->tx_last = NEXT_TX(greth->tx_last);
 211                         }
 212                         greth->tx_free += nr_frags+1;
 213                         dev_kfree_skb(skb);
 214                 }
 215
 216
 217         } else { /* 10/100 Mbps MAC */
 218
 219                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 220                         kfree(greth->rx_bufs[i]);
 221                         dma_unmap_single(greth->dev,
 222                                          greth_read_bd(&rx_bdp->addr),
 223                                          MAX_FRAME_SIZE,
 224                                          DMA_FROM_DEVICE);
 225                 }
 226                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 227                         kfree(greth->tx_bufs[i]);
 228                         dma_unmap_single(greth->dev,
 229                                          greth_read_bd(&tx_bdp->addr),
 230                                          MAX_FRAME_SIZE,
 231                                          DMA_TO_DEVICE);
 232                 }
 233         }
 234 }
 235
 236 static int greth_init_rings(struct greth_private *greth)
 237 {
 238         struct sk_buff *skb;
 239         struct greth_bd *rx_bd, *tx_bd;
 240         u32 dma_addr;
 241         int i;
 242
 243         rx_bd = greth->rx_bd_base;
 244         tx_bd = greth->tx_bd_base;
 245
 246         /* Initialize descriptor rings and buffers */
 247         if (greth->gbit_mac) {
 248
 249                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 250                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 251                         if (skb == NULL) {
 252                                 if (netif_msg_ifup(greth))
 253                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 254                                 goto cleanup;
 255                         }
 256                         skb_reserve(skb, NET_IP_ALIGN);
 257                         dma_addr = dma_map_single(greth->dev,
 258                                                   skb->data,
 259                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 260                                                   DMA_FROM_DEVICE);
 261
 262                         if (dma_mapping_error(greth->dev, dma_addr)) {
 263                                 if (netif_msg_ifup(greth))
 264                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 265                                 dev_kfree_skb(skb);
 266                                 goto cleanup;
 267                         }
 268                         greth->rx_skbuff[i] = skb;
 269                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 270                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 271                 }
 272
 273         } else {
 274
 275                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 276                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 277
 278                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 279
 280                         if (greth->rx_bufs[i] == NULL) {
 281                                 if (netif_msg_ifup(greth))
 282                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 283                                 goto cleanup;
 284                         }
 285
 286                         dma_addr = dma_map_single(greth->dev,
 287                                                   greth->rx_bufs[i],
 288                                                   MAX_FRAME_SIZE,
 289                                                   DMA_FROM_DEVICE);
 290
 291                         if (dma_mapping_error(greth->dev, dma_addr)) {
 292                                 if (netif_msg_ifup(greth))
 293                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 294                                 goto cleanup;
 295                         }
 296                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 297                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 298                 }
 299                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 300
 301                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 302
 303                         if (greth->tx_bufs[i] == NULL) {
 304                                 if (netif_msg_ifup(greth))
 305                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 306                                 goto cleanup;
 307                         }
 308
 309                         dma_addr = dma_map_single(greth->dev,
 310                                                   greth->tx_bufs[i],
 311                                                   MAX_FRAME_SIZE,
 312                                                   DMA_TO_DEVICE);
 313
 314                         if (dma_mapping_error(greth->dev, dma_addr)) {
 315                                 if (netif_msg_ifup(greth))
 316                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 317                                 goto cleanup;
 318                         }
 319                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 320                         greth_write_bd(&tx_bd[i].stat, 0);
 321                 }
 322         }
 323         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 324                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 325
 326         /* Initialize pointers. */
 327         greth->rx_cur = 0;
 328         greth->tx_next = 0;
 329         greth->tx_last = 0;
 330         greth->tx_free = GRETH_TXBD_NUM;
 331
 332         /* Initialize descriptor base address */
 333         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 334         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 335
 336         return 0;
 337
 338 cleanup:
 339         greth_clean_rings(greth);
 340         return -ENOMEM;
 341 }
 342
 343 static int greth_open(struct net_device *dev)
 344 {
 345         struct greth_private *greth = netdev_priv(dev);
 346         int err;
 347
 348         err = greth_init_rings(greth);
 349         if (err) {
 350                 if (netif_msg_ifup(greth))
 351                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 352                 return err;
 353         }
 354
 355         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 356         if (err) {
 357                 if (netif_msg_ifup(greth))
 358                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 359                 greth_clean_rings(greth);
 360                 return err;
 361         }
 362
 363         if (netif_msg_ifup(greth))
 364                 dev_dbg(&dev->dev, " starting queue\n");
 365         netif_start_queue(dev);
 366
 367         GRETH_REGSAVE(greth->regs->status, 0xFF);
 368
 369         napi_enable(&greth->napi);
 370
 371         greth_enable_irqs(greth);
 372         greth_enable_tx(greth);
 373         greth_enable_rx(greth);
 374         return 0;
 375
 376 }
 377
 378 static int greth_close(struct net_device *dev)
 379 {
 380         struct greth_private *greth = netdev_priv(dev);
 381
 382         napi_disable(&greth->napi);
 383
 384         greth_disable_irqs(greth);
 385         greth_disable_tx(greth);
 386         greth_disable_rx(greth);
 387
 388         netif_stop_queue(dev);
 389
 390         free_irq(greth->irq, (void *) dev);
 391
 392         greth_clean_rings(greth);
 393
 394         return 0;
 395 }
 396
 397 static netdev_tx_t
 398 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 399 {
 400         struct greth_private *greth = netdev_priv(dev);
 401         struct greth_bd *bdp;
 402         int err = NETDEV_TX_OK;
 403         u32 status, dma_addr, ctrl;
 404         unsigned long flags;
 405
 406         /* Clean TX Ring */
 407         greth_clean_tx(greth->netdev);
 408
 409         if (unlikely(greth->tx_free <= 0)) {
 410                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 411                 ctrl = GRETH_REGLOAD(greth->regs->control);
 412                 /* Enable TX IRQ only if not already in poll() routine */
 413                 if (ctrl & GRETH_RXI)
 414                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 415                 netif_stop_queue(dev);
 416                 spin_unlock_irqrestore(&greth->devlock, flags);
 417                 return NETDEV_TX_BUSY;
 418         }
 419
 420         if (netif_msg_pktdata(greth))
 421                 greth_print_tx_packet(skb);
 422
 423
 424         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 425                 dev->stats.tx_errors++;
 426                 goto out;
 427         }
 428
 429         bdp = greth->tx_bd_base + greth->tx_next;
 430         dma_addr = greth_read_bd(&bdp->addr);
 431
 432         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 433
 434         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 435
 436         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 437         greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
 438
 439         /* Wrap around descriptor ring */
 440         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 441                 status |= GRETH_BD_WR;
 442         }
 443
 444         greth->tx_next = NEXT_TX(greth->tx_next);
 445         greth->tx_free--;
 446
 447         /* Write descriptor control word and enable transmission */
 448         greth_write_bd(&bdp->stat, status);
 449         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 450         greth_enable_tx(greth);
 451         spin_unlock_irqrestore(&greth->devlock, flags);
 452
 453 out:
 454         dev_kfree_skb(skb);
 455         return err;
 456 }
 457
 458 static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
 459 {
 460         if (tx_next < tx_last)
 461                 return (tx_last - tx_next) - 1;
 462         else
 463                 return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
 464 }
 465
 466 static netdev_tx_t
 467 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 468 {
 469         struct greth_private *greth = netdev_priv(dev);
 470         struct greth_bd *bdp;
 471         u32 status, dma_addr;
 472         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 473         unsigned long flags;
 474         u16 tx_last;
 475
 476         nr_frags = skb_shinfo(skb)->nr_frags;
 477         tx_last = greth->tx_last;
 478         rmb(); /* tx_last is updated by the poll task */
 479
 480         if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
 481                 netif_stop_queue(dev);
 482                 err = NETDEV_TX_BUSY;
 483                 goto out;
 484         }
 485
 486         if (netif_msg_pktdata(greth))
 487                 greth_print_tx_packet(skb);
 488
 489         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 490                 dev->stats.tx_errors++;
 491                 goto out;
 492         }
 493
 494         /* Save skb pointer. */
 495         greth->tx_skbuff[greth->tx_next] = skb;
 496
 497         /* Linear buf */
 498         if (nr_frags != 0)
 499                 status = GRETH_TXBD_MORE;
 500         else
 501                 status = GRETH_BD_IE;
 502
 503         if (skb->ip_summed == CHECKSUM_PARTIAL)
 504                 status |= GRETH_TXBD_CSALL;
 505         status |= skb_headlen(skb) & GRETH_BD_LEN;
 506         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 507                 status |= GRETH_BD_WR;
 508
 509
 510         bdp = greth->tx_bd_base + greth->tx_next;
 511         greth_write_bd(&bdp->stat, status);
 512         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 513
 514         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 515                 goto map_error;
 516
 517         greth_write_bd(&bdp->addr, dma_addr);
 518
 519         curr_tx = NEXT_TX(greth->tx_next);
 520
 521         /* Frags */
 522         for (i = 0; i < nr_frags; i++) {
 523                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 524                 greth->tx_skbuff[curr_tx] = NULL;
 525                 bdp = greth->tx_bd_base + curr_tx;
 526
 527                 status = GRETH_BD_EN;
 528                 if (skb->ip_summed == CHECKSUM_PARTIAL)
 529                         status |= GRETH_TXBD_CSALL;
 530                 status |= skb_frag_size(frag) & GRETH_BD_LEN;
 531
 532                 /* Wrap around descriptor ring */
 533                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 534                         status |= GRETH_BD_WR;
 535
 536                 /* More fragments left */
 537                 if (i < nr_frags - 1)
 538                         status |= GRETH_TXBD_MORE;
 539                 else
 540                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 541
 542                 greth_write_bd(&bdp->stat, status);
 543
 544                 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
 545                                             DMA_TO_DEVICE);
 546
 547                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 548                         goto frag_map_error;
 549
 550                 greth_write_bd(&bdp->addr, dma_addr);
 551
 552                 curr_tx = NEXT_TX(curr_tx);
 553         }
 554
 555         wmb();
 556
 557         /* Enable the descriptor chain by enabling the first descriptor */
 558         bdp = greth->tx_bd_base + greth->tx_next;
 559         greth_write_bd(&bdp->stat,
 560                        greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 561
 562         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 563         greth->tx_next = curr_tx;
 564         greth_enable_tx_and_irq(greth);
 565         spin_unlock_irqrestore(&greth->devlock, flags);
 566
 567         return NETDEV_TX_OK;
 568
 569 frag_map_error:
 570         /* Unmap SKB mappings that succeeded and disable descriptor */
 571         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 572                 bdp = greth->tx_bd_base + greth->tx_next + i;
 573                 dma_unmap_single(greth->dev,
 574                                  greth_read_bd(&bdp->addr),
 575                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 576                                  DMA_TO_DEVICE);
 577                 greth_write_bd(&bdp->stat, 0);
 578         }
 579 map_error:
 580         if (net_ratelimit())
 581                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 582         dev_kfree_skb(skb);
 583 out:
 584         return err;
 585 }
 586
 587 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 588 {
 589         struct net_device *dev = dev_id;
 590         struct greth_private *greth;
 591         u32 status, ctrl;
 592         irqreturn_t retval = IRQ_NONE;
 593
 594         greth = netdev_priv(dev);
 595
 596         spin_lock(&greth->devlock);
 597
 598         /* Get the interrupt events that caused us to be here. */
 599         status = GRETH_REGLOAD(greth->regs->status);
 600
 601         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 602          * set regardless of whether IRQ is enabled or not. Especially
 603          * important when shared IRQ.
 604          */
 605         ctrl = GRETH_REGLOAD(greth->regs->control);
 606
 607         /* Handle rx and tx interrupts through poll */
 608         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 609             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 610                 retval = IRQ_HANDLED;
 611
 612                 /* Disable interrupts and schedule poll() */
 613                 greth_disable_irqs(greth);
 614                 napi_schedule(&greth->napi);
 615         }
 616
 617         mmiowb();
 618         spin_unlock(&greth->devlock);
 619
 620         return retval;
 621 }
 622
 623 static void greth_clean_tx(struct net_device *dev)
 624 {
 625         struct greth_private *greth;
 626         struct greth_bd *bdp;
 627         u32 stat;
 628
 629         greth = netdev_priv(dev);
 630
 631         while (1) {
 632                 bdp = greth->tx_bd_base + greth->tx_last;
 633                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 634                 mb();
 635                 stat = greth_read_bd(&bdp->stat);
 636
 637                 if (unlikely(stat & GRETH_BD_EN))
 638                         break;
 639
 640                 if (greth->tx_free == GRETH_TXBD_NUM)
 641                         break;
 642
 643                 /* Check status for errors */
 644                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 645                         dev->stats.tx_errors++;
 646                         if (stat & GRETH_TXBD_ERR_AL)
 647                                 dev->stats.tx_aborted_errors++;
 648                         if (stat & GRETH_TXBD_ERR_UE)
 649                                 dev->stats.tx_fifo_errors++;
 650                 }
 651                 dev->stats.tx_packets++;
 652                 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
 653                 greth->tx_last = NEXT_TX(greth->tx_last);
 654                 greth->tx_free++;
 655         }
 656
 657         if (greth->tx_free > 0) {
 658                 netif_wake_queue(dev);
 659         }
 660 }
 661
 662 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 663 {
 664         /* Check status for errors */
 665         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 666                 dev->stats.tx_errors++;
 667                 if (stat & GRETH_TXBD_ERR_AL)
 668                         dev->stats.tx_aborted_errors++;
 669                 if (stat & GRETH_TXBD_ERR_UE)
 670                         dev->stats.tx_fifo_errors++;
 671                 if (stat & GRETH_TXBD_ERR_LC)
 672                         dev->stats.tx_aborted_errors++;
 673         }
 674         dev->stats.tx_packets++;
 675 }
 676
 677 static void greth_clean_tx_gbit(struct net_device *dev)
 678 {
 679         struct greth_private *greth;
 680         struct greth_bd *bdp, *bdp_last_frag;
 681         struct sk_buff *skb = NULL;
 682         u32 stat;
 683         int nr_frags, i;
 684         u16 tx_last;
 685
 686         greth = netdev_priv(dev);
 687         tx_last = greth->tx_last;
 688
 689         while (tx_last != greth->tx_next) {
 690
 691                 skb = greth->tx_skbuff[tx_last];
 692
 693                 nr_frags = skb_shinfo(skb)->nr_frags;
 694
 695                 /* We only clean fully completed SKBs */
 696                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
 697
 698                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 699                 mb();
 700                 stat = greth_read_bd(&bdp_last_frag->stat);
 701
 702                 if (stat & GRETH_BD_EN)
 703                         break;
 704
 705                 greth->tx_skbuff[tx_last] = NULL;
 706
 707                 greth_update_tx_stats(dev, stat);
 708                 dev->stats.tx_bytes += skb->len;
 709
 710                 bdp = greth->tx_bd_base + tx_last;
 711
 712                 tx_last = NEXT_TX(tx_last);
 713
 714                 dma_unmap_single(greth->dev,
 715                                  greth_read_bd(&bdp->addr),
 716                                  skb_headlen(skb),
 717                                  DMA_TO_DEVICE);
 718
 719                 for (i = 0; i < nr_frags; i++) {
 720                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 721                         bdp = greth->tx_bd_base + tx_last;
 722
 723                         dma_unmap_page(greth->dev,
 724                                        greth_read_bd(&bdp->addr),
 725                                        skb_frag_size(frag),
 726                                        DMA_TO_DEVICE);
 727
 728                         tx_last = NEXT_TX(tx_last);
 729                 }
 730                 dev_kfree_skb(skb);
 731         }
 732         if (skb) { /* skb is set only if the above while loop was entered */
 733                 wmb();
 734                 greth->tx_last = tx_last;
 735
 736                 if (netif_queue_stopped(dev) &&
 737                     (greth_num_free_bds(tx_last, greth->tx_next) >
 738                     (MAX_SKB_FRAGS+1)))
 739                         netif_wake_queue(dev);
 740         }
 741 }
 742
 743 static int greth_rx(struct net_device *dev, int limit)
 744 {
 745         struct greth_private *greth;
 746         struct greth_bd *bdp;
 747         struct sk_buff *skb;
 748         int pkt_len;
 749         int bad, count;
 750         u32 status, dma_addr;
 751         unsigned long flags;
 752
 753         greth = netdev_priv(dev);
 754
 755         for (count = 0; count < limit; ++count) {
 756
 757                 bdp = greth->rx_bd_base + greth->rx_cur;
 758                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 759                 mb();
 760                 status = greth_read_bd(&bdp->stat);
 761
 762                 if (unlikely(status & GRETH_BD_EN)) {
 763                         break;
 764                 }
 765
 766                 dma_addr = greth_read_bd(&bdp->addr);
 767                 bad = 0;
 768
 769                 /* Check status for errors. */
 770                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 771                         if (status & GRETH_RXBD_ERR_FT) {
 772                                 dev->stats.rx_length_errors++;
 773                                 bad = 1;
 774                         }
 775                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 776                                 dev->stats.rx_frame_errors++;
 777                                 bad = 1;
 778                         }
 779                         if (status & GRETH_RXBD_ERR_CRC) {
 780                                 dev->stats.rx_crc_errors++;
 781                                 bad = 1;
 782                         }
 783                 }
 784                 if (unlikely(bad)) {
 785                         dev->stats.rx_errors++;
 786
 787                 } else {
 788
 789                         pkt_len = status & GRETH_BD_LEN;
 790
 791                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 792
 793                         if (unlikely(skb == NULL)) {
 794
 795                                 if (net_ratelimit())
 796                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 797
 798                                 dev->stats.rx_dropped++;
 799
 800                         } else {
 801                                 skb_reserve(skb, NET_IP_ALIGN);
 802
 803                                 dma_sync_single_for_cpu(greth->dev,
 804                                                         dma_addr,
 805                                                         pkt_len,
 806                                                         DMA_FROM_DEVICE);
 807
 808                                 if (netif_msg_pktdata(greth))
 809                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 810
 811                                 skb_put_data(skb, phys_to_virt(dma_addr),
 812                                              pkt_len);
 813
 814                                 skb->protocol = eth_type_trans(skb, dev);
 815                                 dev->stats.rx_bytes += pkt_len;
 816                                 dev->stats.rx_packets++;
 817                                 netif_receive_skb(skb);
 818                         }
 819                 }
 820
 821                 status = GRETH_BD_EN | GRETH_BD_IE;
 822                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 823                         status |= GRETH_BD_WR;
 824                 }
 825
 826                 wmb();
 827                 greth_write_bd(&bdp->stat, status);
 828
 829                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 830
 831                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 832                 greth_enable_rx(greth);
 833                 spin_unlock_irqrestore(&greth->devlock, flags);
 834
 835                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 836         }
 837
 838         return count;
 839 }
 840
 841 static inline int hw_checksummed(u32 status)
 842 {
 843
 844         if (status & GRETH_RXBD_IP_FRAG)
 845                 return 0;
 846
 847         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 848                 return 0;
 849
 850         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 851                 return 0;
 852
 853         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 854                 return 0;
 855
 856         return 1;
 857 }
 858
 859 static int greth_rx_gbit(struct net_device *dev, int limit)
 860 {
 861         struct greth_private *greth;
 862         struct greth_bd *bdp;
 863         struct sk_buff *skb, *newskb;
 864         int pkt_len;
 865         int bad, count = 0;
 866         u32 status, dma_addr;
 867         unsigned long flags;
 868
 869         greth = netdev_priv(dev);
 870
 871         for (count = 0; count < limit; ++count) {
 872
 873                 bdp = greth->rx_bd_base + greth->rx_cur;
 874                 skb = greth->rx_skbuff[greth->rx_cur];
 875                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 876                 mb();
 877                 status = greth_read_bd(&bdp->stat);
 878                 bad = 0;
 879
 880                 if (status & GRETH_BD_EN)
 881                         break;
 882
 883                 /* Check status for errors. */
 884                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 885
 886                         if (status & GRETH_RXBD_ERR_FT) {
 887                                 dev->stats.rx_length_errors++;
 888                                 bad = 1;
 889                         } else if (status &
 890                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 891                                 dev->stats.rx_frame_errors++;
 892                                 bad = 1;
 893                         } else if (status & GRETH_RXBD_ERR_CRC) {
 894                                 dev->stats.rx_crc_errors++;
 895                                 bad = 1;
 896                         }
 897                 }
 898
 899                 /* Allocate new skb to replace current, not needed if the
 900                  * current skb can be reused */
 901                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 902                         skb_reserve(newskb, NET_IP_ALIGN);
 903
 904                         dma_addr = dma_map_single(greth->dev,
 905                                                       newskb->data,
 906                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 907                                                       DMA_FROM_DEVICE);
 908
 909                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 910                                 /* Process the incoming frame. */
 911                                 pkt_len = status & GRETH_BD_LEN;
 912
 913                                 dma_unmap_single(greth->dev,
 914                                                  greth_read_bd(&bdp->addr),
 915                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 916                                                  DMA_FROM_DEVICE);
 917
 918                                 if (netif_msg_pktdata(greth))
 919                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 920
 921                                 skb_put(skb, pkt_len);
 922
 923                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 924                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 925                                 else
 926                                         skb_checksum_none_assert(skb);
 927
 928                                 skb->protocol = eth_type_trans(skb, dev);
 929                                 dev->stats.rx_packets++;
 930                                 dev->stats.rx_bytes += pkt_len;
 931                                 netif_receive_skb(skb);
 932
 933                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 934                                 greth_write_bd(&bdp->addr, dma_addr);
 935                         } else {
 936                                 if (net_ratelimit())
 937                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 938                                 dev_kfree_skb(newskb);
 939                                 /* reusing current skb, so it is a drop */
 940                                 dev->stats.rx_dropped++;
 941                         }
 942                 } else if (bad) {
 943                         /* Bad Frame transfer, the skb is reused */
 944                         dev->stats.rx_dropped++;
 945                 } else {
 946                         /* Failed Allocating a new skb. This is rather stupid
 947                          * but the current "filled" skb is reused, as if
 948                          * transfer failure. One could argue that RX descriptor
 949                          * table handling should be divided into cleaning and
 950                          * filling as the TX part of the driver
 951                          */
 952                         if (net_ratelimit())
 953                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 954                         /* reusing current skb, so it is a drop */
 955                         dev->stats.rx_dropped++;
 956                 }
 957
 958                 status = GRETH_BD_EN | GRETH_BD_IE;
 959                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 960                         status |= GRETH_BD_WR;
 961                 }
 962
 963                 wmb();
 964                 greth_write_bd(&bdp->stat, status);
 965                 spin_lock_irqsave(&greth->devlock, flags);
 966                 greth_enable_rx(greth);
 967                 spin_unlock_irqrestore(&greth->devlock, flags);
 968                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 969         }
 970
 971         return count;
 972
 973 }
 974
 975 static int greth_poll(struct napi_struct *napi, int budget)
 976 {
 977         struct greth_private *greth;
 978         int work_done = 0;
 979         unsigned long flags;
 980         u32 mask, ctrl;
 981         greth = container_of(napi, struct greth_private, napi);
 982
 983 restart_txrx_poll:
 984         if (greth->gbit_mac) {
 985                 greth_clean_tx_gbit(greth->netdev);
 986                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 987         } else {
 988                 if (netif_queue_stopped(greth->netdev))
 989                         greth_clean_tx(greth->netdev);
 990                 work_done += greth_rx(greth->netdev, budget - work_done);
 991         }
 992
 993         if (work_done < budget) {
 994
 995                 spin_lock_irqsave(&greth->devlock, flags);
 996
 997                 ctrl = GRETH_REGLOAD(greth->regs->control);
 998                 if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
 999                     (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
1000                         GRETH_REGSAVE(greth->regs->control,
1001                                         ctrl | GRETH_TXI | GRETH_RXI);
1002                         mask = GRETH_INT_RX | GRETH_INT_RE |
1003                                GRETH_INT_TX | GRETH_INT_TE;
1004                 } else {
1005                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
1006                         mask = GRETH_INT_RX | GRETH_INT_RE;
1007                 }
1008
1009                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1010                         GRETH_REGSAVE(greth->regs->control, ctrl);
1011                         spin_unlock_irqrestore(&greth->devlock, flags);
1012                         goto restart_txrx_poll;
1013                 } else {
1014                         napi_complete_done(napi, work_done);
1015                         spin_unlock_irqrestore(&greth->devlock, flags);
1016                 }
1017         }
1018
1019         return work_done;
1020 }
1021
1022 static int greth_set_mac_add(struct net_device *dev, void *p)
1023 {
1024         struct sockaddr *addr = p;
1025         struct greth_private *greth;
1026         struct greth_regs *regs;
1027
1028         greth = netdev_priv(dev);
1029         regs = greth->regs;
1030
1031         if (!is_valid_ether_addr(addr->sa_data))
1032                 return -EADDRNOTAVAIL;
1033
1034         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1035         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1036         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1037                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1038
1039         return 0;
1040 }
1041
1042 static u32 greth_hash_get_index(__u8 *addr)
1043 {
1044         return (ether_crc(6, addr)) & 0x3F;
1045 }
1046
1047 static void greth_set_hash_filter(struct net_device *dev)
1048 {
1049         struct netdev_hw_addr *ha;
1050         struct greth_private *greth = netdev_priv(dev);
1051         struct greth_regs *regs = greth->regs;
1052         u32 mc_filter[2];
1053         unsigned int bitnr;
1054
1055         mc_filter[0] = mc_filter[1] = 0;
1056
1057         netdev_for_each_mc_addr(ha, dev) {
1058                 bitnr = greth_hash_get_index(ha->addr);
1059                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1060         }
1061
1062         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1063         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1064 }
1065
1066 static void greth_set_multicast_list(struct net_device *dev)
1067 {
1068         int cfg;
1069         struct greth_private *greth = netdev_priv(dev);
1070         struct greth_regs *regs = greth->regs;
1071
1072         cfg = GRETH_REGLOAD(regs->control);
1073         if (dev->flags & IFF_PROMISC)
1074                 cfg |= GRETH_CTRL_PR;
1075         else
1076                 cfg &= ~GRETH_CTRL_PR;
1077
1078         if (greth->multicast) {
1079                 if (dev->flags & IFF_ALLMULTI) {
1080                         GRETH_REGSAVE(regs->hash_msb, -1);
1081                         GRETH_REGSAVE(regs->hash_lsb, -1);
1082                         cfg |= GRETH_CTRL_MCEN;
1083                         GRETH_REGSAVE(regs->control, cfg);
1084                         return;
1085                 }
1086
1087                 if (netdev_mc_empty(dev)) {
1088                         cfg &= ~GRETH_CTRL_MCEN;
1089                         GRETH_REGSAVE(regs->control, cfg);
1090                         return;
1091                 }
1092
1093                 /* Setup multicast filter */
1094                 greth_set_hash_filter(dev);
1095                 cfg |= GRETH_CTRL_MCEN;
1096         }
1097         GRETH_REGSAVE(regs->control, cfg);
1098 }
1099
1100 static u32 greth_get_msglevel(struct net_device *dev)
1101 {
1102         struct greth_private *greth = netdev_priv(dev);
1103         return greth->msg_enable;
1104 }
1105
1106 static void greth_set_msglevel(struct net_device *dev, u32 value)
1107 {
1108         struct greth_private *greth = netdev_priv(dev);
1109         greth->msg_enable = value;
1110 }
1111
1112 static int greth_get_regs_len(struct net_device *dev)
1113 {
1114         return sizeof(struct greth_regs);
1115 }
1116
1117 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1118 {
1119         struct greth_private *greth = netdev_priv(dev);
1120
1121         strlcpy(info->driver, dev_driver_string(greth->dev),
1122                 sizeof(info->driver));
1123         strlcpy(info->version, "revision: 1.0", sizeof(info->version));
1124         strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1125         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1126 }
1127
1128 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1129 {
1130         int i;
1131         struct greth_private *greth = netdev_priv(dev);
1132         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1133         u32 *buff = p;
1134
1135         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1136                 buff[i] = greth_read_bd(&greth_regs[i]);
1137 }
1138
1139 static const struct ethtool_ops greth_ethtool_ops = {
1140         .get_msglevel           = greth_get_msglevel,
1141         .set_msglevel           = greth_set_msglevel,
1142         .get_drvinfo            = greth_get_drvinfo,
1143         .get_regs_len           = greth_get_regs_len,
1144         .get_regs               = greth_get_regs,
1145         .get_link               = ethtool_op_get_link,
1146         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
1147         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
1148 };
1149
1150 static struct net_device_ops greth_netdev_ops = {
1151         .ndo_open               = greth_open,
1152         .ndo_stop               = greth_close,
1153         .ndo_start_xmit         = greth_start_xmit,
1154         .ndo_set_mac_address    = greth_set_mac_add,
1155         .ndo_validate_addr      = eth_validate_addr,
1156 };
1157
1158 static inline int wait_for_mdio(struct greth_private *greth)
1159 {
1160         unsigned long timeout = jiffies + 4*HZ/100;
1161         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1162                 if (time_after(jiffies, timeout))
1163                         return 0;
1164         }
1165         return 1;
1166 }
1167
1168 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1169 {
1170         struct greth_private *greth = bus->priv;
1171         int data;
1172
1173         if (!wait_for_mdio(greth))
1174                 return -EBUSY;
1175
1176         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1177
1178         if (!wait_for_mdio(greth))
1179                 return -EBUSY;
1180
1181         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1182                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1183                 return data;
1184
1185         } else {
1186                 return -1;
1187         }
1188 }
1189
1190 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1191 {
1192         struct greth_private *greth = bus->priv;
1193
1194         if (!wait_for_mdio(greth))
1195                 return -EBUSY;
1196
1197         GRETH_REGSAVE(greth->regs->mdio,
1198                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1199
1200         if (!wait_for_mdio(greth))
1201                 return -EBUSY;
1202
1203         return 0;
1204 }
1205
1206 static void greth_link_change(struct net_device *dev)
1207 {
1208         struct greth_private *greth = netdev_priv(dev);
1209         struct phy_device *phydev = dev->phydev;
1210         unsigned long flags;
1211         int status_change = 0;
1212         u32 ctrl;
1213
1214         spin_lock_irqsave(&greth->devlock, flags);
1215
1216         if (phydev->link) {
1217
1218                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1219                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1220                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1221
1222                         if (phydev->duplex)
1223                                 ctrl |= GRETH_CTRL_FD;
1224
1225                         if (phydev->speed == SPEED_100)
1226                                 ctrl |= GRETH_CTRL_SP;
1227                         else if (phydev->speed == SPEED_1000)
1228                                 ctrl |= GRETH_CTRL_GB;
1229
1230                         GRETH_REGSAVE(greth->regs->control, ctrl);
1231                         greth->speed = phydev->speed;
1232                         greth->duplex = phydev->duplex;
1233                         status_change = 1;
1234                 }
1235         }
1236
1237         if (phydev->link != greth->link) {
1238                 if (!phydev->link) {
1239                         greth->speed = 0;
1240                         greth->duplex = -1;
1241                 }
1242                 greth->link = phydev->link;
1243
1244                 status_change = 1;
1245         }
1246
1247         spin_unlock_irqrestore(&greth->devlock, flags);
1248
1249         if (status_change) {
1250                 if (phydev->link)
1251                         pr_debug("%s: link up (%d/%s)\n",
1252                                 dev->name, phydev->speed,
1253                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1254                 else
1255                         pr_debug("%s: link down\n", dev->name);
1256         }
1257 }
1258
1259 static int greth_mdio_probe(struct net_device *dev)
1260 {
1261         struct greth_private *greth = netdev_priv(dev);
1262         struct phy_device *phy = NULL;
1263         int ret;
1264
1265         /* Find the first PHY */
1266         phy = phy_find_first(greth->mdio);
1267
1268         if (!phy) {
1269                 if (netif_msg_probe(greth))
1270                         dev_err(&dev->dev, "no PHY found\n");
1271                 return -ENXIO;
1272         }
1273
1274         ret = phy_connect_direct(dev, phy, &greth_link_change,
1275                                  greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1276         if (ret) {
1277                 if (netif_msg_ifup(greth))
1278                         dev_err(&dev->dev, "could not attach to PHY\n");
1279                 return ret;
1280         }
1281
1282         if (greth->gbit_mac)
1283                 phy->supported &= PHY_GBIT_FEATURES;
1284         else
1285                 phy->supported &= PHY_BASIC_FEATURES;
1286
1287         phy->advertising = phy->supported;
1288
1289         greth->link = 0;
1290         greth->speed = 0;
1291         greth->duplex = -1;
1292
1293         return 0;
1294 }
1295
1296 static int greth_mdio_init(struct greth_private *greth)
1297 {
1298         int ret;
1299         unsigned long timeout;
1300         struct net_device *ndev = greth->netdev;
1301
1302         greth->mdio = mdiobus_alloc();
1303         if (!greth->mdio) {
1304                 return -ENOMEM;
1305         }
1306
1307         greth->mdio->name = "greth-mdio";
1308         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1309         greth->mdio->read = greth_mdio_read;
1310         greth->mdio->write = greth_mdio_write;
1311         greth->mdio->priv = greth;
1312
1313         ret = mdiobus_register(greth->mdio);
1314         if (ret) {
1315                 goto error;
1316         }
1317
1318         ret = greth_mdio_probe(greth->netdev);
1319         if (ret) {
1320                 if (netif_msg_probe(greth))
1321                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1322                 goto unreg_mdio;
1323         }
1324
1325         phy_start(ndev->phydev);
1326
1327         /* If Ethernet debug link is used make autoneg happen right away */
1328         if (greth->edcl && greth_edcl == 1) {
1329                 phy_start_aneg(ndev->phydev);
1330                 timeout = jiffies + 6*HZ;
1331                 while (!phy_aneg_done(ndev->phydev) &&
1332                        time_before(jiffies, timeout)) {
1333                 }
1334                 phy_read_status(ndev->phydev);
1335                 greth_link_change(greth->netdev);
1336         }
1337
1338         return 0;
1339
1340 unreg_mdio:
1341         mdiobus_unregister(greth->mdio);
1342 error:
1343         mdiobus_free(greth->mdio);
1344         return ret;
1345 }
1346
1347 /* Initialize the GRETH MAC */
1348 static int greth_of_probe(struct platform_device *ofdev)
1349 {
1350         struct net_device *dev;
1351         struct greth_private *greth;
1352         struct greth_regs *regs;
1353
1354         int i;
1355         int err;
1356         int tmp;
1357         unsigned long timeout;
1358
1359         dev = alloc_etherdev(sizeof(struct greth_private));
1360
1361         if (dev == NULL)
1362                 return -ENOMEM;
1363
1364         greth = netdev_priv(dev);
1365         greth->netdev = dev;
1366         greth->dev = &ofdev->dev;
1367
1368         if (greth_debug > 0)
1369                 greth->msg_enable = greth_debug;
1370         else
1371                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1372
1373         spin_lock_init(&greth->devlock);
1374
1375         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1376                                  resource_size(&ofdev->resource[0]),
1377                                  "grlib-greth regs");
1378
1379         if (greth->regs == NULL) {
1380                 if (netif_msg_probe(greth))
1381                         dev_err(greth->dev, "ioremap failure.\n");
1382                 err = -EIO;
1383                 goto error1;
1384         }
1385
1386         regs = greth->regs;
1387         greth->irq = ofdev->archdata.irqs[0];
1388
1389         dev_set_drvdata(greth->dev, dev);
1390         SET_NETDEV_DEV(dev, greth->dev);
1391
1392         if (netif_msg_probe(greth))
1393                 dev_dbg(greth->dev, "resetting controller.\n");
1394
1395         /* Reset the controller. */
1396         GRETH_REGSAVE(regs->control, GRETH_RESET);
1397
1398         /* Wait for MAC to reset itself */
1399         timeout = jiffies + HZ/100;
1400         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1401                 if (time_after(jiffies, timeout)) {
1402                         err = -EIO;
1403                         if (netif_msg_probe(greth))
1404                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1405                         goto error2;
1406                 }
1407         }
1408
1409         /* Get default PHY address  */
1410         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1411
1412         /* Check if we have GBIT capable MAC */
1413         tmp = GRETH_REGLOAD(regs->control);
1414         greth->gbit_mac = (tmp >> 27) & 1;
1415
1416         /* Check for multicast capability */
1417         greth->multicast = (tmp >> 25) & 1;
1418
1419         greth->edcl = (tmp >> 31) & 1;
1420
1421         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1422          * it doesn't interfere with the software */
1423         if (greth->edcl != 0)
1424                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1425
1426         /* Check if MAC can handle MDIO interrupts */
1427         greth->mdio_int_en = (tmp >> 26) & 1;
1428
1429         err = greth_mdio_init(greth);
1430         if (err) {
1431                 if (netif_msg_probe(greth))
1432                         dev_err(greth->dev, "failed to register MDIO bus\n");
1433                 goto error2;
1434         }
1435
1436         /* Allocate TX descriptor ring in coherent memory */
1437         greth->tx_bd_base = dma_zalloc_coherent(greth->dev, 1024,
1438                                                 &greth->tx_bd_base_phys,
1439                                                 GFP_KERNEL);
1440         if (!greth->tx_bd_base) {
1441                 err = -ENOMEM;
1442                 goto error3;
1443         }
1444
1445         /* Allocate RX descriptor ring in coherent memory */
1446         greth->rx_bd_base = dma_zalloc_coherent(greth->dev, 1024,
1447                                                 &greth->rx_bd_base_phys,
1448                                                 GFP_KERNEL);
1449         if (!greth->rx_bd_base) {
1450                 err = -ENOMEM;
1451                 goto error4;
1452         }
1453
1454         /* Get MAC address from: module param, OF property or ID prom */
1455         for (i = 0; i < 6; i++) {
1456                 if (macaddr[i] != 0)
1457                         break;
1458         }
1459         if (i == 6) {
1460                 const u8 *addr;
1461
1462                 addr = of_get_mac_address(ofdev->dev.of_node);
1463                 if (addr) {
1464                         for (i = 0; i < 6; i++)
1465                                 macaddr[i] = (unsigned int) addr[i];
1466                 } else {
1467 #ifdef CONFIG_SPARC
1468                         for (i = 0; i < 6; i++)
1469                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1470 #endif
1471                 }
1472         }
1473
1474         for (i = 0; i < 6; i++)
1475                 dev->dev_addr[i] = macaddr[i];
1476
1477         macaddr[5]++;
1478
1479         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1480                 if (netif_msg_probe(greth))
1481                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1482                 err = -EINVAL;
1483                 goto error5;
1484         }
1485
1486         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1487         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1488                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1489
1490         /* Clear all pending interrupts except PHY irq */
1491         GRETH_REGSAVE(regs->status, 0xFF);
1492
1493         if (greth->gbit_mac) {
1494                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1495                         NETIF_F_RXCSUM;
1496                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1497                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1498         }
1499
1500         if (greth->multicast) {
1501                 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1502                 dev->flags |= IFF_MULTICAST;
1503         } else {
1504                 dev->flags &= ~IFF_MULTICAST;
1505         }
1506
1507         dev->netdev_ops = &greth_netdev_ops;
1508         dev->ethtool_ops = &greth_ethtool_ops;
1509
1510         err = register_netdev(dev);
1511         if (err) {
1512                 if (netif_msg_probe(greth))
1513                         dev_err(greth->dev, "netdevice registration failed.\n");
1514                 goto error5;
1515         }
1516
1517         /* setup NAPI */
1518         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1519
1520         return 0;
1521
1522 error5:
1523         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1524 error4:
1525         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1526 error3:
1527         mdiobus_unregister(greth->mdio);
1528 error2:
1529         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1530 error1:
1531         free_netdev(dev);
1532         return err;
1533 }
1534
1535 static int greth_of_remove(struct platform_device *of_dev)
1536 {
1537         struct net_device *ndev = platform_get_drvdata(of_dev);
1538         struct greth_private *greth = netdev_priv(ndev);
1539
1540         /* Free descriptor areas */
1541         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1542
1543         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1544
1545         if (ndev->phydev)
1546                 phy_stop(ndev->phydev);
1547         mdiobus_unregister(greth->mdio);
1548
1549         unregister_netdev(ndev);
1550
1551         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1552
1553         free_netdev(ndev);
1554
1555         return 0;
1556 }
1557
1558 static const struct of_device_id greth_of_match[] = {
1559         {
1560          .name = "GAISLER_ETHMAC",
1561          },
1562         {
1563          .name = "01_01d",
1564          },
1565         {},
1566 };
1567
1568 MODULE_DEVICE_TABLE(of, greth_of_match);
1569
1570 static struct platform_driver greth_of_driver = {
1571         .driver = {
1572                 .name = "grlib-greth",
1573                 .of_match_table = greth_of_match,
1574         },
1575         .probe = greth_of_probe,
1576         .remove = greth_of_remove,
1577 };
1578
1579 module_platform_driver(greth_of_driver);
1580
1581 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1582 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1583 MODULE_LICENSE("GPL");