drivers/net/greth.c

   1 /*
   2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
   3  *
   4  * 2005-2010 (c) Aeroflex Gaisler AB
   5  *
   6  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
   7  * available in the GRLIB VHDL IP core library.
   8  *
   9  * Full documentation of both cores can be found here:
  10  * http://www.gaisler.com/products/grlib/grip.pdf
  11  *
  12  * The Gigabit version supports scatter/gather DMA, any alignment of
  13  * buffers and checksum offloading.
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the
  17  * Free Software Foundation; either version 2 of the License, or (at your
  18  * option) any later version.
  19  *
  20  * Contributors: Kristoffer Glembo
  21  *               Daniel Hellstrom
  22  *               Marko Isomaki
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/init.h>
  28 #include <linux/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_platform.h>
  38 #include <linux/slab.h>
  39 #include <asm/cacheflush.h>
  40 #include <asm/byteorder.h>
  41
  42 #ifdef CONFIG_SPARC
  43 #include <asm/idprom.h>
  44 #endif
  45
  46 #include "greth.h"
  47
  48 #define GRETH_DEF_MSG_ENABLE      \
  49         (NETIF_MSG_DRV          | \
  50          NETIF_MSG_PROBE        | \
  51          NETIF_MSG_LINK         | \
  52          NETIF_MSG_IFDOWN       | \
  53          NETIF_MSG_IFUP         | \
  54          NETIF_MSG_RX_ERR       | \
  55          NETIF_MSG_TX_ERR)
  56
  57 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  58 module_param(greth_debug, int, 0);
  59 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  60
  61 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  62 static int macaddr[6];
  63 module_param_array(macaddr, int, NULL, 0);
  64 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  65
  66 static int greth_edcl = 1;
  67 module_param(greth_edcl, int, 0);
  68 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  69
  70 static int greth_open(struct net_device *dev);
  71 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  72            struct net_device *dev);
  73 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  74            struct net_device *dev);
  75 static int greth_rx(struct net_device *dev, int limit);
  76 static int greth_rx_gbit(struct net_device *dev, int limit);
  77 static void greth_clean_tx(struct net_device *dev);
  78 static void greth_clean_tx_gbit(struct net_device *dev);
  79 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  80 static int greth_close(struct net_device *dev);
  81 static int greth_set_mac_add(struct net_device *dev, void *p);
  82 static void greth_set_multicast_list(struct net_device *dev);
  83
  84 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  85 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  86 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  87 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  88
  89 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  90 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  91 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  92
  93 static void greth_print_rx_packet(void *addr, int len)
  94 {
  95         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  96                         addr, len, true);
  97 }
  98
  99 static void greth_print_tx_packet(struct sk_buff *skb)
 100 {
 101         int i;
 102         int length;
 103
 104         if (skb_shinfo(skb)->nr_frags == 0)
 105                 length = skb->len;
 106         else
 107                 length = skb_headlen(skb);
 108
 109         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 110                         skb->data, length, true);
 111
 112         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 113
 114                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 115                                phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
 116                                skb_shinfo(skb)->frags[i].page_offset,
 117                                length, 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_disable_tx(struct greth_private *greth)
 128 {
 129         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 130 }
 131
 132 static inline void greth_enable_rx(struct greth_private *greth)
 133 {
 134         wmb();
 135         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 136 }
 137
 138 static inline void greth_disable_rx(struct greth_private *greth)
 139 {
 140         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 141 }
 142
 143 static inline void greth_enable_irqs(struct greth_private *greth)
 144 {
 145         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 146 }
 147
 148 static inline void greth_disable_irqs(struct greth_private *greth)
 149 {
 150         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 151 }
 152
 153 static inline void greth_write_bd(u32 *bd, u32 val)
 154 {
 155         __raw_writel(cpu_to_be32(val), bd);
 156 }
 157
 158 static inline u32 greth_read_bd(u32 *bd)
 159 {
 160         return be32_to_cpu(__raw_readl(bd));
 161 }
 162
 163 static void greth_clean_rings(struct greth_private *greth)
 164 {
 165         int i;
 166         struct greth_bd *rx_bdp = greth->rx_bd_base;
 167         struct greth_bd *tx_bdp = greth->tx_bd_base;
 168
 169         if (greth->gbit_mac) {
 170
 171                 /* Free and unmap RX buffers */
 172                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 173                         if (greth->rx_skbuff[i] != NULL) {
 174                                 dev_kfree_skb(greth->rx_skbuff[i]);
 175                                 dma_unmap_single(greth->dev,
 176                                                  greth_read_bd(&rx_bdp->addr),
 177                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 178                                                  DMA_FROM_DEVICE);
 179                         }
 180                 }
 181
 182                 /* TX buffers */
 183                 while (greth->tx_free < GRETH_TXBD_NUM) {
 184
 185                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 186                         int nr_frags = skb_shinfo(skb)->nr_frags;
 187                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 188                         greth->tx_last = NEXT_TX(greth->tx_last);
 189
 190                         dma_unmap_single(greth->dev,
 191                                          greth_read_bd(&tx_bdp->addr),
 192                                          skb_headlen(skb),
 193                                          DMA_TO_DEVICE);
 194
 195                         for (i = 0; i < nr_frags; i++) {
 196                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 197                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 198
 199                                 dma_unmap_page(greth->dev,
 200                                                greth_read_bd(&tx_bdp->addr),
 201                                                frag->size,
 202                                                DMA_TO_DEVICE);
 203
 204                                 greth->tx_last = NEXT_TX(greth->tx_last);
 205                         }
 206                         greth->tx_free += nr_frags+1;
 207                         dev_kfree_skb(skb);
 208                 }
 209
 210
 211         } else { /* 10/100 Mbps MAC */
 212
 213                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 214                         kfree(greth->rx_bufs[i]);
 215                         dma_unmap_single(greth->dev,
 216                                          greth_read_bd(&rx_bdp->addr),
 217                                          MAX_FRAME_SIZE,
 218                                          DMA_FROM_DEVICE);
 219                 }
 220                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 221                         kfree(greth->tx_bufs[i]);
 222                         dma_unmap_single(greth->dev,
 223                                          greth_read_bd(&tx_bdp->addr),
 224                                          MAX_FRAME_SIZE,
 225                                          DMA_TO_DEVICE);
 226                 }
 227         }
 228 }
 229
 230 static int greth_init_rings(struct greth_private *greth)
 231 {
 232         struct sk_buff *skb;
 233         struct greth_bd *rx_bd, *tx_bd;
 234         u32 dma_addr;
 235         int i;
 236
 237         rx_bd = greth->rx_bd_base;
 238         tx_bd = greth->tx_bd_base;
 239
 240         /* Initialize descriptor rings and buffers */
 241         if (greth->gbit_mac) {
 242
 243                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 244                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 245                         if (skb == NULL) {
 246                                 if (netif_msg_ifup(greth))
 247                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 248                                 goto cleanup;
 249                         }
 250                         skb_reserve(skb, NET_IP_ALIGN);
 251                         dma_addr = dma_map_single(greth->dev,
 252                                                   skb->data,
 253                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 254                                                   DMA_FROM_DEVICE);
 255
 256                         if (dma_mapping_error(greth->dev, dma_addr)) {
 257                                 if (netif_msg_ifup(greth))
 258                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 259                                 goto cleanup;
 260                         }
 261                         greth->rx_skbuff[i] = skb;
 262                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 263                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 264                 }
 265
 266         } else {
 267
 268                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 269                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 270
 271                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 272
 273                         if (greth->rx_bufs[i] == NULL) {
 274                                 if (netif_msg_ifup(greth))
 275                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 276                                 goto cleanup;
 277                         }
 278
 279                         dma_addr = dma_map_single(greth->dev,
 280                                                   greth->rx_bufs[i],
 281                                                   MAX_FRAME_SIZE,
 282                                                   DMA_FROM_DEVICE);
 283
 284                         if (dma_mapping_error(greth->dev, dma_addr)) {
 285                                 if (netif_msg_ifup(greth))
 286                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 287                                 goto cleanup;
 288                         }
 289                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 290                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 291                 }
 292                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 293
 294                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 295
 296                         if (greth->tx_bufs[i] == NULL) {
 297                                 if (netif_msg_ifup(greth))
 298                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 299                                 goto cleanup;
 300                         }
 301
 302                         dma_addr = dma_map_single(greth->dev,
 303                                                   greth->tx_bufs[i],
 304                                                   MAX_FRAME_SIZE,
 305                                                   DMA_TO_DEVICE);
 306
 307                         if (dma_mapping_error(greth->dev, dma_addr)) {
 308                                 if (netif_msg_ifup(greth))
 309                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 310                                 goto cleanup;
 311                         }
 312                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 313                         greth_write_bd(&tx_bd[i].stat, 0);
 314                 }
 315         }
 316         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 317                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 318
 319         /* Initialize pointers. */
 320         greth->rx_cur = 0;
 321         greth->tx_next = 0;
 322         greth->tx_last = 0;
 323         greth->tx_free = GRETH_TXBD_NUM;
 324
 325         /* Initialize descriptor base address */
 326         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 327         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 328
 329         return 0;
 330
 331 cleanup:
 332         greth_clean_rings(greth);
 333         return -ENOMEM;
 334 }
 335
 336 static int greth_open(struct net_device *dev)
 337 {
 338         struct greth_private *greth = netdev_priv(dev);
 339         int err;
 340
 341         err = greth_init_rings(greth);
 342         if (err) {
 343                 if (netif_msg_ifup(greth))
 344                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 345                 return err;
 346         }
 347
 348         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 349         if (err) {
 350                 if (netif_msg_ifup(greth))
 351                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 352                 greth_clean_rings(greth);
 353                 return err;
 354         }
 355
 356         if (netif_msg_ifup(greth))
 357                 dev_dbg(&dev->dev, " starting queue\n");
 358         netif_start_queue(dev);
 359
 360         GRETH_REGSAVE(greth->regs->status, 0xFF);
 361
 362         napi_enable(&greth->napi);
 363
 364         greth_enable_irqs(greth);
 365         greth_enable_tx(greth);
 366         greth_enable_rx(greth);
 367         return 0;
 368
 369 }
 370
 371 static int greth_close(struct net_device *dev)
 372 {
 373         struct greth_private *greth = netdev_priv(dev);
 374
 375         napi_disable(&greth->napi);
 376
 377         greth_disable_irqs(greth);
 378         greth_disable_tx(greth);
 379         greth_disable_rx(greth);
 380
 381         netif_stop_queue(dev);
 382
 383         free_irq(greth->irq, (void *) dev);
 384
 385         greth_clean_rings(greth);
 386
 387         return 0;
 388 }
 389
 390 static netdev_tx_t
 391 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 392 {
 393         struct greth_private *greth = netdev_priv(dev);
 394         struct greth_bd *bdp;
 395         int err = NETDEV_TX_OK;
 396         u32 status, dma_addr, ctrl;
 397         unsigned long flags;
 398
 399         /* Clean TX Ring */
 400         greth_clean_tx(greth->netdev);
 401
 402         if (unlikely(greth->tx_free <= 0)) {
 403                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 404                 ctrl = GRETH_REGLOAD(greth->regs->control);
 405                 /* Enable TX IRQ only if not already in poll() routine */
 406                 if (ctrl & GRETH_RXI)
 407                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 408                 netif_stop_queue(dev);
 409                 spin_unlock_irqrestore(&greth->devlock, flags);
 410                 return NETDEV_TX_BUSY;
 411         }
 412
 413         if (netif_msg_pktdata(greth))
 414                 greth_print_tx_packet(skb);
 415
 416
 417         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 418                 dev->stats.tx_errors++;
 419                 goto out;
 420         }
 421
 422         bdp = greth->tx_bd_base + greth->tx_next;
 423         dma_addr = greth_read_bd(&bdp->addr);
 424
 425         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 426
 427         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 428
 429         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 430
 431         /* Wrap around descriptor ring */
 432         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 433                 status |= GRETH_BD_WR;
 434         }
 435
 436         greth->tx_next = NEXT_TX(greth->tx_next);
 437         greth->tx_free--;
 438
 439         /* Write descriptor control word and enable transmission */
 440         greth_write_bd(&bdp->stat, status);
 441         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 442         greth_enable_tx(greth);
 443         spin_unlock_irqrestore(&greth->devlock, flags);
 444
 445 out:
 446         dev_kfree_skb(skb);
 447         return err;
 448 }
 449
 450
 451 static netdev_tx_t
 452 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 453 {
 454         struct greth_private *greth = netdev_priv(dev);
 455         struct greth_bd *bdp;
 456         u32 status = 0, dma_addr, ctrl;
 457         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 458         unsigned long flags;
 459
 460         nr_frags = skb_shinfo(skb)->nr_frags;
 461
 462         /* Clean TX Ring */
 463         greth_clean_tx_gbit(dev);
 464
 465         if (greth->tx_free < nr_frags + 1) {
 466                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 467                 ctrl = GRETH_REGLOAD(greth->regs->control);
 468                 /* Enable TX IRQ only if not already in poll() routine */
 469                 if (ctrl & GRETH_RXI)
 470                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 471                 netif_stop_queue(dev);
 472                 spin_unlock_irqrestore(&greth->devlock, flags);
 473                 err = NETDEV_TX_BUSY;
 474                 goto out;
 475         }
 476
 477         if (netif_msg_pktdata(greth))
 478                 greth_print_tx_packet(skb);
 479
 480         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 481                 dev->stats.tx_errors++;
 482                 goto out;
 483         }
 484
 485         /* Save skb pointer. */
 486         greth->tx_skbuff[greth->tx_next] = skb;
 487
 488         /* Linear buf */
 489         if (nr_frags != 0)
 490                 status = GRETH_TXBD_MORE;
 491
 492         status |= GRETH_TXBD_CSALL;
 493         status |= skb_headlen(skb) & GRETH_BD_LEN;
 494         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 495                 status |= GRETH_BD_WR;
 496
 497
 498         bdp = greth->tx_bd_base + greth->tx_next;
 499         greth_write_bd(&bdp->stat, status);
 500         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 501
 502         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 503                 goto map_error;
 504
 505         greth_write_bd(&bdp->addr, dma_addr);
 506
 507         curr_tx = NEXT_TX(greth->tx_next);
 508
 509         /* Frags */
 510         for (i = 0; i < nr_frags; i++) {
 511                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 512                 greth->tx_skbuff[curr_tx] = NULL;
 513                 bdp = greth->tx_bd_base + curr_tx;
 514
 515                 status = GRETH_TXBD_CSALL | GRETH_BD_EN;
 516                 status |= frag->size & GRETH_BD_LEN;
 517
 518                 /* Wrap around descriptor ring */
 519                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 520                         status |= GRETH_BD_WR;
 521
 522                 /* More fragments left */
 523                 if (i < nr_frags - 1)
 524                         status |= GRETH_TXBD_MORE;
 525                 else
 526                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 527
 528                 greth_write_bd(&bdp->stat, status);
 529
 530                 dma_addr = dma_map_page(greth->dev,
 531                                         frag->page,
 532                                         frag->page_offset,
 533                                         frag->size,
 534                                         DMA_TO_DEVICE);
 535
 536                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 537                         goto frag_map_error;
 538
 539                 greth_write_bd(&bdp->addr, dma_addr);
 540
 541                 curr_tx = NEXT_TX(curr_tx);
 542         }
 543
 544         wmb();
 545
 546         /* Enable the descriptor chain by enabling the first descriptor */
 547         bdp = greth->tx_bd_base + greth->tx_next;
 548         greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 549         greth->tx_next = curr_tx;
 550         greth->tx_free -= nr_frags + 1;
 551
 552         wmb();
 553
 554         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 555         greth_enable_tx(greth);
 556         spin_unlock_irqrestore(&greth->devlock, flags);
 557
 558         return NETDEV_TX_OK;
 559
 560 frag_map_error:
 561         /* Unmap SKB mappings that succeeded and disable descriptor */
 562         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 563                 bdp = greth->tx_bd_base + greth->tx_next + i;
 564                 dma_unmap_single(greth->dev,
 565                                  greth_read_bd(&bdp->addr),
 566                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 567                                  DMA_TO_DEVICE);
 568                 greth_write_bd(&bdp->stat, 0);
 569         }
 570 map_error:
 571         if (net_ratelimit())
 572                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 573         dev_kfree_skb(skb);
 574 out:
 575         return err;
 576 }
 577
 578 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 579 {
 580         struct net_device *dev = dev_id;
 581         struct greth_private *greth;
 582         u32 status, ctrl;
 583         irqreturn_t retval = IRQ_NONE;
 584
 585         greth = netdev_priv(dev);
 586
 587         spin_lock(&greth->devlock);
 588
 589         /* Get the interrupt events that caused us to be here. */
 590         status = GRETH_REGLOAD(greth->regs->status);
 591
 592         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 593          * set regardless of whether IRQ is enabled or not. Especially
 594          * important when shared IRQ.
 595          */
 596         ctrl = GRETH_REGLOAD(greth->regs->control);
 597
 598         /* Handle rx and tx interrupts through poll */
 599         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 600             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 601                 retval = IRQ_HANDLED;
 602
 603                 /* Disable interrupts and schedule poll() */
 604                 greth_disable_irqs(greth);
 605                 napi_schedule(&greth->napi);
 606         }
 607
 608         mmiowb();
 609         spin_unlock(&greth->devlock);
 610
 611         return retval;
 612 }
 613
 614 static void greth_clean_tx(struct net_device *dev)
 615 {
 616         struct greth_private *greth;
 617         struct greth_bd *bdp;
 618         u32 stat;
 619
 620         greth = netdev_priv(dev);
 621
 622         while (1) {
 623                 bdp = greth->tx_bd_base + greth->tx_last;
 624                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 625                 mb();
 626                 stat = greth_read_bd(&bdp->stat);
 627
 628                 if (unlikely(stat & GRETH_BD_EN))
 629                         break;
 630
 631                 if (greth->tx_free == GRETH_TXBD_NUM)
 632                         break;
 633
 634                 /* Check status for errors */
 635                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 636                         dev->stats.tx_errors++;
 637                         if (stat & GRETH_TXBD_ERR_AL)
 638                                 dev->stats.tx_aborted_errors++;
 639                         if (stat & GRETH_TXBD_ERR_UE)
 640                                 dev->stats.tx_fifo_errors++;
 641                 }
 642                 dev->stats.tx_packets++;
 643                 greth->tx_last = NEXT_TX(greth->tx_last);
 644                 greth->tx_free++;
 645         }
 646
 647         if (greth->tx_free > 0) {
 648                 netif_wake_queue(dev);
 649         }
 650
 651 }
 652
 653 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 654 {
 655         /* Check status for errors */
 656         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 657                 dev->stats.tx_errors++;
 658                 if (stat & GRETH_TXBD_ERR_AL)
 659                         dev->stats.tx_aborted_errors++;
 660                 if (stat & GRETH_TXBD_ERR_UE)
 661                         dev->stats.tx_fifo_errors++;
 662                 if (stat & GRETH_TXBD_ERR_LC)
 663                         dev->stats.tx_aborted_errors++;
 664         }
 665         dev->stats.tx_packets++;
 666 }
 667
 668 static void greth_clean_tx_gbit(struct net_device *dev)
 669 {
 670         struct greth_private *greth;
 671         struct greth_bd *bdp, *bdp_last_frag;
 672         struct sk_buff *skb;
 673         u32 stat;
 674         int nr_frags, i;
 675
 676         greth = netdev_priv(dev);
 677
 678         while (greth->tx_free < GRETH_TXBD_NUM) {
 679
 680                 skb = greth->tx_skbuff[greth->tx_last];
 681
 682                 nr_frags = skb_shinfo(skb)->nr_frags;
 683
 684                 /* We only clean fully completed SKBs */
 685                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
 686
 687                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 688                 mb();
 689                 stat = greth_read_bd(&bdp_last_frag->stat);
 690
 691                 if (stat & GRETH_BD_EN)
 692                         break;
 693
 694                 greth->tx_skbuff[greth->tx_last] = NULL;
 695
 696                 greth_update_tx_stats(dev, stat);
 697
 698                 bdp = greth->tx_bd_base + greth->tx_last;
 699
 700                 greth->tx_last = NEXT_TX(greth->tx_last);
 701
 702                 dma_unmap_single(greth->dev,
 703                                  greth_read_bd(&bdp->addr),
 704                                  skb_headlen(skb),
 705                                  DMA_TO_DEVICE);
 706
 707                 for (i = 0; i < nr_frags; i++) {
 708                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 709                         bdp = greth->tx_bd_base + greth->tx_last;
 710
 711                         dma_unmap_page(greth->dev,
 712                                        greth_read_bd(&bdp->addr),
 713                                        frag->size,
 714                                        DMA_TO_DEVICE);
 715
 716                         greth->tx_last = NEXT_TX(greth->tx_last);
 717                 }
 718                 greth->tx_free += nr_frags+1;
 719                 dev_kfree_skb(skb);
 720         }
 721
 722         if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
 723                 netif_wake_queue(dev);
 724 }
 725
 726 static int greth_rx(struct net_device *dev, int limit)
 727 {
 728         struct greth_private *greth;
 729         struct greth_bd *bdp;
 730         struct sk_buff *skb;
 731         int pkt_len;
 732         int bad, count;
 733         u32 status, dma_addr;
 734         unsigned long flags;
 735
 736         greth = netdev_priv(dev);
 737
 738         for (count = 0; count < limit; ++count) {
 739
 740                 bdp = greth->rx_bd_base + greth->rx_cur;
 741                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 742                 mb();
 743                 status = greth_read_bd(&bdp->stat);
 744
 745                 if (unlikely(status & GRETH_BD_EN)) {
 746                         break;
 747                 }
 748
 749                 dma_addr = greth_read_bd(&bdp->addr);
 750                 bad = 0;
 751
 752                 /* Check status for errors. */
 753                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 754                         if (status & GRETH_RXBD_ERR_FT) {
 755                                 dev->stats.rx_length_errors++;
 756                                 bad = 1;
 757                         }
 758                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 759                                 dev->stats.rx_frame_errors++;
 760                                 bad = 1;
 761                         }
 762                         if (status & GRETH_RXBD_ERR_CRC) {
 763                                 dev->stats.rx_crc_errors++;
 764                                 bad = 1;
 765                         }
 766                 }
 767                 if (unlikely(bad)) {
 768                         dev->stats.rx_errors++;
 769
 770                 } else {
 771
 772                         pkt_len = status & GRETH_BD_LEN;
 773
 774                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 775
 776                         if (unlikely(skb == NULL)) {
 777
 778                                 if (net_ratelimit())
 779                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 780
 781                                 dev->stats.rx_dropped++;
 782
 783                         } else {
 784                                 skb_reserve(skb, NET_IP_ALIGN);
 785                                 skb->dev = dev;
 786
 787                                 dma_sync_single_for_cpu(greth->dev,
 788                                                         dma_addr,
 789                                                         pkt_len,
 790                                                         DMA_FROM_DEVICE);
 791
 792                                 if (netif_msg_pktdata(greth))
 793                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 794
 795                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
 796
 797                                 skb->protocol = eth_type_trans(skb, dev);
 798                                 dev->stats.rx_packets++;
 799                                 netif_receive_skb(skb);
 800                         }
 801                 }
 802
 803                 status = GRETH_BD_EN | GRETH_BD_IE;
 804                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 805                         status |= GRETH_BD_WR;
 806                 }
 807
 808                 wmb();
 809                 greth_write_bd(&bdp->stat, status);
 810
 811                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 812
 813                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 814                 greth_enable_rx(greth);
 815                 spin_unlock_irqrestore(&greth->devlock, flags);
 816
 817                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 818         }
 819
 820         return count;
 821 }
 822
 823 static inline int hw_checksummed(u32 status)
 824 {
 825
 826         if (status & GRETH_RXBD_IP_FRAG)
 827                 return 0;
 828
 829         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 830                 return 0;
 831
 832         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 833                 return 0;
 834
 835         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 836                 return 0;
 837
 838         return 1;
 839 }
 840
 841 static int greth_rx_gbit(struct net_device *dev, int limit)
 842 {
 843         struct greth_private *greth;
 844         struct greth_bd *bdp;
 845         struct sk_buff *skb, *newskb;
 846         int pkt_len;
 847         int bad, count = 0;
 848         u32 status, dma_addr;
 849         unsigned long flags;
 850
 851         greth = netdev_priv(dev);
 852
 853         for (count = 0; count < limit; ++count) {
 854
 855                 bdp = greth->rx_bd_base + greth->rx_cur;
 856                 skb = greth->rx_skbuff[greth->rx_cur];
 857                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 858                 mb();
 859                 status = greth_read_bd(&bdp->stat);
 860                 bad = 0;
 861
 862                 if (status & GRETH_BD_EN)
 863                         break;
 864
 865                 /* Check status for errors. */
 866                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 867
 868                         if (status & GRETH_RXBD_ERR_FT) {
 869                                 dev->stats.rx_length_errors++;
 870                                 bad = 1;
 871                         } else if (status &
 872                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 873                                 dev->stats.rx_frame_errors++;
 874                                 bad = 1;
 875                         } else if (status & GRETH_RXBD_ERR_CRC) {
 876                                 dev->stats.rx_crc_errors++;
 877                                 bad = 1;
 878                         }
 879                 }
 880
 881                 /* Allocate new skb to replace current, not needed if the
 882                  * current skb can be reused */
 883                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 884                         skb_reserve(newskb, NET_IP_ALIGN);
 885
 886                         dma_addr = dma_map_single(greth->dev,
 887                                                       newskb->data,
 888                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 889                                                       DMA_FROM_DEVICE);
 890
 891                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 892                                 /* Process the incoming frame. */
 893                                 pkt_len = status & GRETH_BD_LEN;
 894
 895                                 dma_unmap_single(greth->dev,
 896                                                  greth_read_bd(&bdp->addr),
 897                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 898                                                  DMA_FROM_DEVICE);
 899
 900                                 if (netif_msg_pktdata(greth))
 901                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 902
 903                                 skb_put(skb, pkt_len);
 904
 905                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 906                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 907                                 else
 908                                         skb_checksum_none_assert(skb);
 909
 910                                 skb->protocol = eth_type_trans(skb, dev);
 911                                 dev->stats.rx_packets++;
 912                                 netif_receive_skb(skb);
 913
 914                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 915                                 greth_write_bd(&bdp->addr, dma_addr);
 916                         } else {
 917                                 if (net_ratelimit())
 918                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 919                                 dev_kfree_skb(newskb);
 920                                 /* reusing current skb, so it is a drop */
 921                                 dev->stats.rx_dropped++;
 922                         }
 923                 } else if (bad) {
 924                         /* Bad Frame transfer, the skb is reused */
 925                         dev->stats.rx_dropped++;
 926                 } else {
 927                         /* Failed Allocating a new skb. This is rather stupid
 928                          * but the current "filled" skb is reused, as if
 929                          * transfer failure. One could argue that RX descriptor
 930                          * table handling should be divided into cleaning and
 931                          * filling as the TX part of the driver
 932                          */
 933                         if (net_ratelimit())
 934                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 935                         /* reusing current skb, so it is a drop */
 936                         dev->stats.rx_dropped++;
 937                 }
 938
 939                 status = GRETH_BD_EN | GRETH_BD_IE;
 940                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 941                         status |= GRETH_BD_WR;
 942                 }
 943
 944                 wmb();
 945                 greth_write_bd(&bdp->stat, status);
 946                 spin_lock_irqsave(&greth->devlock, flags);
 947                 greth_enable_rx(greth);
 948                 spin_unlock_irqrestore(&greth->devlock, flags);
 949                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 950         }
 951
 952         return count;
 953
 954 }
 955
 956 static int greth_poll(struct napi_struct *napi, int budget)
 957 {
 958         struct greth_private *greth;
 959         int work_done = 0;
 960         unsigned long flags;
 961         u32 mask, ctrl;
 962         greth = container_of(napi, struct greth_private, napi);
 963
 964 restart_txrx_poll:
 965         if (netif_queue_stopped(greth->netdev)) {
 966                 if (greth->gbit_mac)
 967                         greth_clean_tx_gbit(greth->netdev);
 968                 else
 969                         greth_clean_tx(greth->netdev);
 970         }
 971
 972         if (greth->gbit_mac) {
 973                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 974         } else {
 975                 work_done += greth_rx(greth->netdev, budget - work_done);
 976         }
 977
 978         if (work_done < budget) {
 979
 980                 spin_lock_irqsave(&greth->devlock, flags);
 981
 982                 ctrl = GRETH_REGLOAD(greth->regs->control);
 983                 if (netif_queue_stopped(greth->netdev)) {
 984                         GRETH_REGSAVE(greth->regs->control,
 985                                         ctrl | GRETH_TXI | GRETH_RXI);
 986                         mask = GRETH_INT_RX | GRETH_INT_RE |
 987                                GRETH_INT_TX | GRETH_INT_TE;
 988                 } else {
 989                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
 990                         mask = GRETH_INT_RX | GRETH_INT_RE;
 991                 }
 992
 993                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
 994                         GRETH_REGSAVE(greth->regs->control, ctrl);
 995                         spin_unlock_irqrestore(&greth->devlock, flags);
 996                         goto restart_txrx_poll;
 997                 } else {
 998                         __napi_complete(napi);
 999                         spin_unlock_irqrestore(&greth->devlock, flags);
1000                 }
1001         }
1002
1003         return work_done;
1004 }
1005
1006 static int greth_set_mac_add(struct net_device *dev, void *p)
1007 {
1008         struct sockaddr *addr = p;
1009         struct greth_private *greth;
1010         struct greth_regs *regs;
1011
1012         greth = netdev_priv(dev);
1013         regs = (struct greth_regs *) greth->regs;
1014
1015         if (!is_valid_ether_addr(addr->sa_data))
1016                 return -EINVAL;
1017
1018         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1019
1020         GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
1021         GRETH_REGSAVE(regs->esa_lsb,
1022                       addr->sa_data[2] << 24 | addr->
1023                       sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
1024         return 0;
1025 }
1026
1027 static u32 greth_hash_get_index(__u8 *addr)
1028 {
1029         return (ether_crc(6, addr)) & 0x3F;
1030 }
1031
1032 static void greth_set_hash_filter(struct net_device *dev)
1033 {
1034         struct netdev_hw_addr *ha;
1035         struct greth_private *greth = netdev_priv(dev);
1036         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1037         u32 mc_filter[2];
1038         unsigned int bitnr;
1039
1040         mc_filter[0] = mc_filter[1] = 0;
1041
1042         netdev_for_each_mc_addr(ha, dev) {
1043                 bitnr = greth_hash_get_index(ha->addr);
1044                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1045         }
1046
1047         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1048         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1049 }
1050
1051 static void greth_set_multicast_list(struct net_device *dev)
1052 {
1053         int cfg;
1054         struct greth_private *greth = netdev_priv(dev);
1055         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1056
1057         cfg = GRETH_REGLOAD(regs->control);
1058         if (dev->flags & IFF_PROMISC)
1059                 cfg |= GRETH_CTRL_PR;
1060         else
1061                 cfg &= ~GRETH_CTRL_PR;
1062
1063         if (greth->multicast) {
1064                 if (dev->flags & IFF_ALLMULTI) {
1065                         GRETH_REGSAVE(regs->hash_msb, -1);
1066                         GRETH_REGSAVE(regs->hash_lsb, -1);
1067                         cfg |= GRETH_CTRL_MCEN;
1068                         GRETH_REGSAVE(regs->control, cfg);
1069                         return;
1070                 }
1071
1072                 if (netdev_mc_empty(dev)) {
1073                         cfg &= ~GRETH_CTRL_MCEN;
1074                         GRETH_REGSAVE(regs->control, cfg);
1075                         return;
1076                 }
1077
1078                 /* Setup multicast filter */
1079                 greth_set_hash_filter(dev);
1080                 cfg |= GRETH_CTRL_MCEN;
1081         }
1082         GRETH_REGSAVE(regs->control, cfg);
1083 }
1084
1085 static u32 greth_get_msglevel(struct net_device *dev)
1086 {
1087         struct greth_private *greth = netdev_priv(dev);
1088         return greth->msg_enable;
1089 }
1090
1091 static void greth_set_msglevel(struct net_device *dev, u32 value)
1092 {
1093         struct greth_private *greth = netdev_priv(dev);
1094         greth->msg_enable = value;
1095 }
1096 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1097 {
1098         struct greth_private *greth = netdev_priv(dev);
1099         struct phy_device *phy = greth->phy;
1100
1101         if (!phy)
1102                 return -ENODEV;
1103
1104         return phy_ethtool_gset(phy, cmd);
1105 }
1106
1107 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1108 {
1109         struct greth_private *greth = netdev_priv(dev);
1110         struct phy_device *phy = greth->phy;
1111
1112         if (!phy)
1113                 return -ENODEV;
1114
1115         return phy_ethtool_sset(phy, cmd);
1116 }
1117
1118 static int greth_get_regs_len(struct net_device *dev)
1119 {
1120         return sizeof(struct greth_regs);
1121 }
1122
1123 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1124 {
1125         struct greth_private *greth = netdev_priv(dev);
1126
1127         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1128         strncpy(info->version, "revision: 1.0", 32);
1129         strncpy(info->bus_info, greth->dev->bus->name, 32);
1130         strncpy(info->fw_version, "N/A", 32);
1131         info->eedump_len = 0;
1132         info->regdump_len = sizeof(struct greth_regs);
1133 }
1134
1135 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1136 {
1137         int i;
1138         struct greth_private *greth = netdev_priv(dev);
1139         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1140         u32 *buff = p;
1141
1142         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1143                 buff[i] = greth_read_bd(&greth_regs[i]);
1144 }
1145
1146 static const struct ethtool_ops greth_ethtool_ops = {
1147         .get_msglevel           = greth_get_msglevel,
1148         .set_msglevel           = greth_set_msglevel,
1149         .get_settings           = greth_get_settings,
1150         .set_settings           = greth_set_settings,
1151         .get_drvinfo            = greth_get_drvinfo,
1152         .get_regs_len           = greth_get_regs_len,
1153         .get_regs               = greth_get_regs,
1154         .get_link               = ethtool_op_get_link,
1155 };
1156
1157 static struct net_device_ops greth_netdev_ops = {
1158         .ndo_open               = greth_open,
1159         .ndo_stop               = greth_close,
1160         .ndo_start_xmit         = greth_start_xmit,
1161         .ndo_set_mac_address    = greth_set_mac_add,
1162         .ndo_validate_addr      = eth_validate_addr,
1163 };
1164
1165 static inline int wait_for_mdio(struct greth_private *greth)
1166 {
1167         unsigned long timeout = jiffies + 4*HZ/100;
1168         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1169                 if (time_after(jiffies, timeout))
1170                         return 0;
1171         }
1172         return 1;
1173 }
1174
1175 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1176 {
1177         struct greth_private *greth = bus->priv;
1178         int data;
1179
1180         if (!wait_for_mdio(greth))
1181                 return -EBUSY;
1182
1183         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1184
1185         if (!wait_for_mdio(greth))
1186                 return -EBUSY;
1187
1188         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1189                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1190                 return data;
1191
1192         } else {
1193                 return -1;
1194         }
1195 }
1196
1197 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1198 {
1199         struct greth_private *greth = bus->priv;
1200
1201         if (!wait_for_mdio(greth))
1202                 return -EBUSY;
1203
1204         GRETH_REGSAVE(greth->regs->mdio,
1205                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1206
1207         if (!wait_for_mdio(greth))
1208                 return -EBUSY;
1209
1210         return 0;
1211 }
1212
1213 static int greth_mdio_reset(struct mii_bus *bus)
1214 {
1215         return 0;
1216 }
1217
1218 static void greth_link_change(struct net_device *dev)
1219 {
1220         struct greth_private *greth = netdev_priv(dev);
1221         struct phy_device *phydev = greth->phy;
1222         unsigned long flags;
1223         int status_change = 0;
1224         u32 ctrl;
1225
1226         spin_lock_irqsave(&greth->devlock, flags);
1227
1228         if (phydev->link) {
1229
1230                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1231                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1232                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1233
1234                         if (phydev->duplex)
1235                                 ctrl |= GRETH_CTRL_FD;
1236
1237                         if (phydev->speed == SPEED_100)
1238                                 ctrl |= GRETH_CTRL_SP;
1239                         else if (phydev->speed == SPEED_1000)
1240                                 ctrl |= GRETH_CTRL_GB;
1241
1242                         GRETH_REGSAVE(greth->regs->control, ctrl);
1243                         greth->speed = phydev->speed;
1244                         greth->duplex = phydev->duplex;
1245                         status_change = 1;
1246                 }
1247         }
1248
1249         if (phydev->link != greth->link) {
1250                 if (!phydev->link) {
1251                         greth->speed = 0;
1252                         greth->duplex = -1;
1253                 }
1254                 greth->link = phydev->link;
1255
1256                 status_change = 1;
1257         }
1258
1259         spin_unlock_irqrestore(&greth->devlock, flags);
1260
1261         if (status_change) {
1262                 if (phydev->link)
1263                         pr_debug("%s: link up (%d/%s)\n",
1264                                 dev->name, phydev->speed,
1265                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1266                 else
1267                         pr_debug("%s: link down\n", dev->name);
1268         }
1269 }
1270
1271 static int greth_mdio_probe(struct net_device *dev)
1272 {
1273         struct greth_private *greth = netdev_priv(dev);
1274         struct phy_device *phy = NULL;
1275         int ret;
1276
1277         /* Find the first PHY */
1278         phy = phy_find_first(greth->mdio);
1279
1280         if (!phy) {
1281                 if (netif_msg_probe(greth))
1282                         dev_err(&dev->dev, "no PHY found\n");
1283                 return -ENXIO;
1284         }
1285
1286         ret = phy_connect_direct(dev, phy, &greth_link_change,
1287                         0, greth->gbit_mac ?
1288                         PHY_INTERFACE_MODE_GMII :
1289                         PHY_INTERFACE_MODE_MII);
1290         if (ret) {
1291                 if (netif_msg_ifup(greth))
1292                         dev_err(&dev->dev, "could not attach to PHY\n");
1293                 return ret;
1294         }
1295
1296         if (greth->gbit_mac)
1297                 phy->supported &= PHY_GBIT_FEATURES;
1298         else
1299                 phy->supported &= PHY_BASIC_FEATURES;
1300
1301         phy->advertising = phy->supported;
1302
1303         greth->link = 0;
1304         greth->speed = 0;
1305         greth->duplex = -1;
1306         greth->phy = phy;
1307
1308         return 0;
1309 }
1310
1311 static inline int phy_aneg_done(struct phy_device *phydev)
1312 {
1313         int retval;
1314
1315         retval = phy_read(phydev, MII_BMSR);
1316
1317         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1318 }
1319
1320 static int greth_mdio_init(struct greth_private *greth)
1321 {
1322         int ret, phy;
1323         unsigned long timeout;
1324
1325         greth->mdio = mdiobus_alloc();
1326         if (!greth->mdio) {
1327                 return -ENOMEM;
1328         }
1329
1330         greth->mdio->name = "greth-mdio";
1331         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1332         greth->mdio->read = greth_mdio_read;
1333         greth->mdio->write = greth_mdio_write;
1334         greth->mdio->reset = greth_mdio_reset;
1335         greth->mdio->priv = greth;
1336
1337         greth->mdio->irq = greth->mdio_irqs;
1338
1339         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1340                 greth->mdio->irq[phy] = PHY_POLL;
1341
1342         ret = mdiobus_register(greth->mdio);
1343         if (ret) {
1344                 goto error;
1345         }
1346
1347         ret = greth_mdio_probe(greth->netdev);
1348         if (ret) {
1349                 if (netif_msg_probe(greth))
1350                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1351                 goto unreg_mdio;
1352         }
1353
1354         phy_start(greth->phy);
1355
1356         /* If Ethernet debug link is used make autoneg happen right away */
1357         if (greth->edcl && greth_edcl == 1) {
1358                 phy_start_aneg(greth->phy);
1359                 timeout = jiffies + 6*HZ;
1360                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1361                 }
1362                 genphy_read_status(greth->phy);
1363                 greth_link_change(greth->netdev);
1364         }
1365
1366         return 0;
1367
1368 unreg_mdio:
1369         mdiobus_unregister(greth->mdio);
1370 error:
1371         mdiobus_free(greth->mdio);
1372         return ret;
1373 }
1374
1375 /* Initialize the GRETH MAC */
1376 static int __devinit greth_of_probe(struct platform_device *ofdev)
1377 {
1378         struct net_device *dev;
1379         struct greth_private *greth;
1380         struct greth_regs *regs;
1381
1382         int i;
1383         int err;
1384         int tmp;
1385         unsigned long timeout;
1386
1387         dev = alloc_etherdev(sizeof(struct greth_private));
1388
1389         if (dev == NULL)
1390                 return -ENOMEM;
1391
1392         greth = netdev_priv(dev);
1393         greth->netdev = dev;
1394         greth->dev = &ofdev->dev;
1395
1396         if (greth_debug > 0)
1397                 greth->msg_enable = greth_debug;
1398         else
1399                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1400
1401         spin_lock_init(&greth->devlock);
1402
1403         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1404                                  resource_size(&ofdev->resource[0]),
1405                                  "grlib-greth regs");
1406
1407         if (greth->regs == NULL) {
1408                 if (netif_msg_probe(greth))
1409                         dev_err(greth->dev, "ioremap failure.\n");
1410                 err = -EIO;
1411                 goto error1;
1412         }
1413
1414         regs = (struct greth_regs *) greth->regs;
1415         greth->irq = ofdev->archdata.irqs[0];
1416
1417         dev_set_drvdata(greth->dev, dev);
1418         SET_NETDEV_DEV(dev, greth->dev);
1419
1420         if (netif_msg_probe(greth))
1421                 dev_dbg(greth->dev, "reseting controller.\n");
1422
1423         /* Reset the controller. */
1424         GRETH_REGSAVE(regs->control, GRETH_RESET);
1425
1426         /* Wait for MAC to reset itself */
1427         timeout = jiffies + HZ/100;
1428         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1429                 if (time_after(jiffies, timeout)) {
1430                         err = -EIO;
1431                         if (netif_msg_probe(greth))
1432                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1433                         goto error2;
1434                 }
1435         }
1436
1437         /* Get default PHY address  */
1438         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1439
1440         /* Check if we have GBIT capable MAC */
1441         tmp = GRETH_REGLOAD(regs->control);
1442         greth->gbit_mac = (tmp >> 27) & 1;
1443
1444         /* Check for multicast capability */
1445         greth->multicast = (tmp >> 25) & 1;
1446
1447         greth->edcl = (tmp >> 31) & 1;
1448
1449         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1450          * it doesn't interfere with the software */
1451         if (greth->edcl != 0)
1452                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1453
1454         /* Check if MAC can handle MDIO interrupts */
1455         greth->mdio_int_en = (tmp >> 26) & 1;
1456
1457         err = greth_mdio_init(greth);
1458         if (err) {
1459                 if (netif_msg_probe(greth))
1460                         dev_err(greth->dev, "failed to register MDIO bus\n");
1461                 goto error2;
1462         }
1463
1464         /* Allocate TX descriptor ring in coherent memory */
1465         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1466                                                                    1024,
1467                                                                    &greth->tx_bd_base_phys,
1468                                                                    GFP_KERNEL);
1469
1470         if (!greth->tx_bd_base) {
1471                 if (netif_msg_probe(greth))
1472                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1473                 err = -ENOMEM;
1474                 goto error3;
1475         }
1476
1477         memset(greth->tx_bd_base, 0, 1024);
1478
1479         /* Allocate RX descriptor ring in coherent memory */
1480         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1481                                                                    1024,
1482                                                                    &greth->rx_bd_base_phys,
1483                                                                    GFP_KERNEL);
1484
1485         if (!greth->rx_bd_base) {
1486                 if (netif_msg_probe(greth))
1487                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1488                 err = -ENOMEM;
1489                 goto error4;
1490         }
1491
1492         memset(greth->rx_bd_base, 0, 1024);
1493
1494         /* Get MAC address from: module param, OF property or ID prom */
1495         for (i = 0; i < 6; i++) {
1496                 if (macaddr[i] != 0)
1497                         break;
1498         }
1499         if (i == 6) {
1500                 const unsigned char *addr;
1501                 int len;
1502                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1503                                         &len);
1504                 if (addr != NULL && len == 6) {
1505                         for (i = 0; i < 6; i++)
1506                                 macaddr[i] = (unsigned int) addr[i];
1507                 } else {
1508 #ifdef CONFIG_SPARC
1509                         for (i = 0; i < 6; i++)
1510                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1511 #endif
1512                 }
1513         }
1514
1515         for (i = 0; i < 6; i++)
1516                 dev->dev_addr[i] = macaddr[i];
1517
1518         macaddr[5]++;
1519
1520         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1521                 if (netif_msg_probe(greth))
1522                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1523                 err = -EINVAL;
1524                 goto error5;
1525         }
1526
1527         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1528         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1529                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1530
1531         /* Clear all pending interrupts except PHY irq */
1532         GRETH_REGSAVE(regs->status, 0xFF);
1533
1534         if (greth->gbit_mac) {
1535                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1536                         NETIF_F_RXCSUM;
1537                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1538                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1539         }
1540
1541         if (greth->multicast) {
1542                 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1543                 dev->flags |= IFF_MULTICAST;
1544         } else {
1545                 dev->flags &= ~IFF_MULTICAST;
1546         }
1547
1548         dev->netdev_ops = &greth_netdev_ops;
1549         dev->ethtool_ops = &greth_ethtool_ops;
1550
1551         err = register_netdev(dev);
1552         if (err) {
1553                 if (netif_msg_probe(greth))
1554                         dev_err(greth->dev, "netdevice registration failed.\n");
1555                 goto error5;
1556         }
1557
1558         /* setup NAPI */
1559         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1560
1561         return 0;
1562
1563 error5:
1564         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1565 error4:
1566         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1567 error3:
1568         mdiobus_unregister(greth->mdio);
1569 error2:
1570         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1571 error1:
1572         free_netdev(dev);
1573         return err;
1574 }
1575
1576 static int __devexit greth_of_remove(struct platform_device *of_dev)
1577 {
1578         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1579         struct greth_private *greth = netdev_priv(ndev);
1580
1581         /* Free descriptor areas */
1582         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1583
1584         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1585
1586         dev_set_drvdata(&of_dev->dev, NULL);
1587
1588         if (greth->phy)
1589                 phy_stop(greth->phy);
1590         mdiobus_unregister(greth->mdio);
1591
1592         unregister_netdev(ndev);
1593         free_netdev(ndev);
1594
1595         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1596
1597         return 0;
1598 }
1599
1600 static struct of_device_id greth_of_match[] = {
1601         {
1602          .name = "GAISLER_ETHMAC",
1603          },
1604         {
1605          .name = "01_01d",
1606          },
1607         {},
1608 };
1609
1610 MODULE_DEVICE_TABLE(of, greth_of_match);
1611
1612 static struct platform_driver greth_of_driver = {
1613         .driver = {
1614                 .name = "grlib-greth",
1615                 .owner = THIS_MODULE,
1616                 .of_match_table = greth_of_match,
1617         },
1618         .probe = greth_of_probe,
1619         .remove = __devexit_p(greth_of_remove),
1620 };
1621
1622 static int __init greth_init(void)
1623 {
1624         return platform_driver_register(&greth_of_driver);
1625 }
1626
1627 static void __exit greth_cleanup(void)
1628 {
1629         platform_driver_unregister(&greth_of_driver);
1630 }
1631
1632 module_init(greth_init);
1633 module_exit(greth_cleanup);
1634
1635 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1636 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1637 MODULE_LICENSE("GPL");