drivers/net/ethernet/aeroflex/greth.c

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