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