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/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/io.h>
  35 #include <linux/crc32.h>
  36 #include <linux/mii.h>
  37 #include <linux/of_device.h>
  38 #include <linux/of_platform.h>
  39 #include <linux/slab.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/byteorder.h>
  42
  43 #ifdef CONFIG_SPARC
  44 #include <asm/idprom.h>
  45 #endif
  46
  47 #include "greth.h"
  48
  49 #define GRETH_DEF_MSG_ENABLE      \
  50         (NETIF_MSG_DRV          | \
  51          NETIF_MSG_PROBE        | \
  52          NETIF_MSG_LINK         | \
  53          NETIF_MSG_IFDOWN       | \
  54          NETIF_MSG_IFUP         | \
  55          NETIF_MSG_RX_ERR       | \
  56          NETIF_MSG_TX_ERR)
  57
  58 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  59 module_param(greth_debug, int, 0);
  60 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  61
  62 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  63 static int macaddr[6];
  64 module_param_array(macaddr, int, NULL, 0);
  65 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  66
  67 static int greth_edcl = 1;
  68 module_param(greth_edcl, int, 0);
  69 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  70
  71 static int greth_open(struct net_device *dev);
  72 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  73            struct net_device *dev);
  74 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  75            struct net_device *dev);
  76 static int greth_rx(struct net_device *dev, int limit);
  77 static int greth_rx_gbit(struct net_device *dev, int limit);
  78 static void greth_clean_tx(struct net_device *dev);
  79 static void greth_clean_tx_gbit(struct net_device *dev);
  80 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  81 static int greth_close(struct net_device *dev);
  82 static int greth_set_mac_add(struct net_device *dev, void *p);
  83 static void greth_set_multicast_list(struct net_device *dev);
  84
  85 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  86 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  87 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  88 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  89
  90 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  91 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  92 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  93
  94 static void greth_print_rx_packet(void *addr, int len)
  95 {
  96         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  97                         addr, len, true);
  98 }
  99
 100 static void greth_print_tx_packet(struct sk_buff *skb)
 101 {
 102         int i;
 103         int length;
 104
 105         if (skb_shinfo(skb)->nr_frags == 0)
 106                 length = skb->len;
 107         else
 108                 length = skb_headlen(skb);
 109
 110         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 111                         skb->data, length, true);
 112
 113         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 114
 115                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 116                                skb_frag_address(&skb_shinfo(skb)->frags[i]),
 117                                skb_shinfo(skb)->frags[i].size, true);
 118         }
 119 }
 120
 121 static inline void greth_enable_tx(struct greth_private *greth)
 122 {
 123         wmb();
 124         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 125 }
 126
 127 static inline void greth_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                                                skb_frag_size(frag),
 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         greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
 431
 432         /* Wrap around descriptor ring */
 433         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 434                 status |= GRETH_BD_WR;
 435         }
 436
 437         greth->tx_next = NEXT_TX(greth->tx_next);
 438         greth->tx_free--;
 439
 440         /* Write descriptor control word and enable transmission */
 441         greth_write_bd(&bdp->stat, status);
 442         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 443         greth_enable_tx(greth);
 444         spin_unlock_irqrestore(&greth->devlock, flags);
 445
 446 out:
 447         dev_kfree_skb(skb);
 448         return err;
 449 }
 450
 451
 452 static netdev_tx_t
 453 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 454 {
 455         struct greth_private *greth = netdev_priv(dev);
 456         struct greth_bd *bdp;
 457         u32 status = 0, dma_addr, ctrl;
 458         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 459         unsigned long flags;
 460
 461         nr_frags = skb_shinfo(skb)->nr_frags;
 462
 463         /* Clean TX Ring */
 464         greth_clean_tx_gbit(dev);
 465
 466         if (greth->tx_free < nr_frags + 1) {
 467                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 468                 ctrl = GRETH_REGLOAD(greth->regs->control);
 469                 /* Enable TX IRQ only if not already in poll() routine */
 470                 if (ctrl & GRETH_RXI)
 471                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 472                 netif_stop_queue(dev);
 473                 spin_unlock_irqrestore(&greth->devlock, flags);
 474                 err = NETDEV_TX_BUSY;
 475                 goto out;
 476         }
 477
 478         if (netif_msg_pktdata(greth))
 479                 greth_print_tx_packet(skb);
 480
 481         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 482                 dev->stats.tx_errors++;
 483                 goto out;
 484         }
 485
 486         /* Save skb pointer. */
 487         greth->tx_skbuff[greth->tx_next] = skb;
 488
 489         /* Linear buf */
 490         if (nr_frags != 0)
 491                 status = GRETH_TXBD_MORE;
 492
 493         if (skb->ip_summed == CHECKSUM_PARTIAL)
 494                 status |= GRETH_TXBD_CSALL;
 495         status |= skb_headlen(skb) & GRETH_BD_LEN;
 496         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 497                 status |= GRETH_BD_WR;
 498
 499
 500         bdp = greth->tx_bd_base + greth->tx_next;
 501         greth_write_bd(&bdp->stat, status);
 502         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 503
 504         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 505                 goto map_error;
 506
 507         greth_write_bd(&bdp->addr, dma_addr);
 508
 509         curr_tx = NEXT_TX(greth->tx_next);
 510
 511         /* Frags */
 512         for (i = 0; i < nr_frags; i++) {
 513                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 514                 greth->tx_skbuff[curr_tx] = NULL;
 515                 bdp = greth->tx_bd_base + curr_tx;
 516
 517                 status = GRETH_BD_EN;
 518                 if (skb->ip_summed == CHECKSUM_PARTIAL)
 519                         status |= GRETH_TXBD_CSALL;
 520                 status |= skb_frag_size(frag) & GRETH_BD_LEN;
 521
 522                 /* Wrap around descriptor ring */
 523                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 524                         status |= GRETH_BD_WR;
 525
 526                 /* More fragments left */
 527                 if (i < nr_frags - 1)
 528                         status |= GRETH_TXBD_MORE;
 529                 else
 530                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 531
 532                 greth_write_bd(&bdp->stat, status);
 533
 534                 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
 535                                             DMA_TO_DEVICE);
 536
 537                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 538                         goto frag_map_error;
 539
 540                 greth_write_bd(&bdp->addr, dma_addr);
 541
 542                 curr_tx = NEXT_TX(curr_tx);
 543         }
 544
 545         wmb();
 546
 547         /* Enable the descriptor chain by enabling the first descriptor */
 548         bdp = greth->tx_bd_base + greth->tx_next;
 549         greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 550         greth->tx_next = curr_tx;
 551         greth->tx_free -= nr_frags + 1;
 552
 553         wmb();
 554
 555         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 556         greth_enable_tx(greth);
 557         spin_unlock_irqrestore(&greth->devlock, flags);
 558
 559         return NETDEV_TX_OK;
 560
 561 frag_map_error:
 562         /* Unmap SKB mappings that succeeded and disable descriptor */
 563         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 564                 bdp = greth->tx_bd_base + greth->tx_next + i;
 565                 dma_unmap_single(greth->dev,
 566                                  greth_read_bd(&bdp->addr),
 567                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 568                                  DMA_TO_DEVICE);
 569                 greth_write_bd(&bdp->stat, 0);
 570         }
 571 map_error:
 572         if (net_ratelimit())
 573                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 574         dev_kfree_skb(skb);
 575 out:
 576         return err;
 577 }
 578
 579 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 580 {
 581         struct net_device *dev = dev_id;
 582         struct greth_private *greth;
 583         u32 status, ctrl;
 584         irqreturn_t retval = IRQ_NONE;
 585
 586         greth = netdev_priv(dev);
 587
 588         spin_lock(&greth->devlock);
 589
 590         /* Get the interrupt events that caused us to be here. */
 591         status = GRETH_REGLOAD(greth->regs->status);
 592
 593         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 594          * set regardless of whether IRQ is enabled or not. Especially
 595          * important when shared IRQ.
 596          */
 597         ctrl = GRETH_REGLOAD(greth->regs->control);
 598
 599         /* Handle rx and tx interrupts through poll */
 600         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 601             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 602                 retval = IRQ_HANDLED;
 603
 604                 /* Disable interrupts and schedule poll() */
 605                 greth_disable_irqs(greth);
 606                 napi_schedule(&greth->napi);
 607         }
 608
 609         mmiowb();
 610         spin_unlock(&greth->devlock);
 611
 612         return retval;
 613 }
 614
 615 static void greth_clean_tx(struct net_device *dev)
 616 {
 617         struct greth_private *greth;
 618         struct greth_bd *bdp;
 619         u32 stat;
 620
 621         greth = netdev_priv(dev);
 622
 623         while (1) {
 624                 bdp = greth->tx_bd_base + greth->tx_last;
 625                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 626                 mb();
 627                 stat = greth_read_bd(&bdp->stat);
 628
 629                 if (unlikely(stat & GRETH_BD_EN))
 630                         break;
 631
 632                 if (greth->tx_free == GRETH_TXBD_NUM)
 633                         break;
 634
 635                 /* Check status for errors */
 636                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 637                         dev->stats.tx_errors++;
 638                         if (stat & GRETH_TXBD_ERR_AL)
 639                                 dev->stats.tx_aborted_errors++;
 640                         if (stat & GRETH_TXBD_ERR_UE)
 641                                 dev->stats.tx_fifo_errors++;
 642                 }
 643                 dev->stats.tx_packets++;
 644                 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
 645                 greth->tx_last = NEXT_TX(greth->tx_last);
 646                 greth->tx_free++;
 647         }
 648
 649         if (greth->tx_free > 0) {
 650                 netif_wake_queue(dev);
 651         }
 652
 653 }
 654
 655 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 656 {
 657         /* Check status for errors */
 658         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 659                 dev->stats.tx_errors++;
 660                 if (stat & GRETH_TXBD_ERR_AL)
 661                         dev->stats.tx_aborted_errors++;
 662                 if (stat & GRETH_TXBD_ERR_UE)
 663                         dev->stats.tx_fifo_errors++;
 664                 if (stat & GRETH_TXBD_ERR_LC)
 665                         dev->stats.tx_aborted_errors++;
 666         }
 667         dev->stats.tx_packets++;
 668 }
 669
 670 static void greth_clean_tx_gbit(struct net_device *dev)
 671 {
 672         struct greth_private *greth;
 673         struct greth_bd *bdp, *bdp_last_frag;
 674         struct sk_buff *skb;
 675         u32 stat;
 676         int nr_frags, i;
 677
 678         greth = netdev_priv(dev);
 679
 680         while (greth->tx_free < GRETH_TXBD_NUM) {
 681
 682                 skb = greth->tx_skbuff[greth->tx_last];
 683
 684                 nr_frags = skb_shinfo(skb)->nr_frags;
 685
 686                 /* We only clean fully completed SKBs */
 687                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
 688
 689                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 690                 mb();
 691                 stat = greth_read_bd(&bdp_last_frag->stat);
 692
 693                 if (stat & GRETH_BD_EN)
 694                         break;
 695
 696                 greth->tx_skbuff[greth->tx_last] = NULL;
 697
 698                 greth_update_tx_stats(dev, stat);
 699                 dev->stats.tx_bytes += skb->len;
 700
 701                 bdp = greth->tx_bd_base + greth->tx_last;
 702
 703                 greth->tx_last = NEXT_TX(greth->tx_last);
 704
 705                 dma_unmap_single(greth->dev,
 706                                  greth_read_bd(&bdp->addr),
 707                                  skb_headlen(skb),
 708                                  DMA_TO_DEVICE);
 709
 710                 for (i = 0; i < nr_frags; i++) {
 711                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 712                         bdp = greth->tx_bd_base + greth->tx_last;
 713
 714                         dma_unmap_page(greth->dev,
 715                                        greth_read_bd(&bdp->addr),
 716                                        skb_frag_size(frag),
 717                                        DMA_TO_DEVICE);
 718
 719                         greth->tx_last = NEXT_TX(greth->tx_last);
 720                 }
 721                 greth->tx_free += nr_frags+1;
 722                 dev_kfree_skb(skb);
 723         }
 724
 725         if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
 726                 netif_wake_queue(dev);
 727 }
 728
 729 static int greth_rx(struct net_device *dev, int limit)
 730 {
 731         struct greth_private *greth;
 732         struct greth_bd *bdp;
 733         struct sk_buff *skb;
 734         int pkt_len;
 735         int bad, count;
 736         u32 status, dma_addr;
 737         unsigned long flags;
 738
 739         greth = netdev_priv(dev);
 740
 741         for (count = 0; count < limit; ++count) {
 742
 743                 bdp = greth->rx_bd_base + greth->rx_cur;
 744                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 745                 mb();
 746                 status = greth_read_bd(&bdp->stat);
 747
 748                 if (unlikely(status & GRETH_BD_EN)) {
 749                         break;
 750                 }
 751
 752                 dma_addr = greth_read_bd(&bdp->addr);
 753                 bad = 0;
 754
 755                 /* Check status for errors. */
 756                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 757                         if (status & GRETH_RXBD_ERR_FT) {
 758                                 dev->stats.rx_length_errors++;
 759                                 bad = 1;
 760                         }
 761                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 762                                 dev->stats.rx_frame_errors++;
 763                                 bad = 1;
 764                         }
 765                         if (status & GRETH_RXBD_ERR_CRC) {
 766                                 dev->stats.rx_crc_errors++;
 767                                 bad = 1;
 768                         }
 769                 }
 770                 if (unlikely(bad)) {
 771                         dev->stats.rx_errors++;
 772
 773                 } else {
 774
 775                         pkt_len = status & GRETH_BD_LEN;
 776
 777                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 778
 779                         if (unlikely(skb == NULL)) {
 780
 781                                 if (net_ratelimit())
 782                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 783
 784                                 dev->stats.rx_dropped++;
 785
 786                         } else {
 787                                 skb_reserve(skb, NET_IP_ALIGN);
 788
 789                                 dma_sync_single_for_cpu(greth->dev,
 790                                                         dma_addr,
 791                                                         pkt_len,
 792                                                         DMA_FROM_DEVICE);
 793
 794                                 if (netif_msg_pktdata(greth))
 795                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 796
 797                                 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
 798
 799                                 skb->protocol = eth_type_trans(skb, dev);
 800                                 dev->stats.rx_bytes += pkt_len;
 801                                 dev->stats.rx_packets++;
 802                                 netif_receive_skb(skb);
 803                         }
 804                 }
 805
 806                 status = GRETH_BD_EN | GRETH_BD_IE;
 807                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 808                         status |= GRETH_BD_WR;
 809                 }
 810
 811                 wmb();
 812                 greth_write_bd(&bdp->stat, status);
 813
 814                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 815
 816                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 817                 greth_enable_rx(greth);
 818                 spin_unlock_irqrestore(&greth->devlock, flags);
 819
 820                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 821         }
 822
 823         return count;
 824 }
 825
 826 static inline int hw_checksummed(u32 status)
 827 {
 828
 829         if (status & GRETH_RXBD_IP_FRAG)
 830                 return 0;
 831
 832         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 833                 return 0;
 834
 835         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 836                 return 0;
 837
 838         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 839                 return 0;
 840
 841         return 1;
 842 }
 843
 844 static int greth_rx_gbit(struct net_device *dev, int limit)
 845 {
 846         struct greth_private *greth;
 847         struct greth_bd *bdp;
 848         struct sk_buff *skb, *newskb;
 849         int pkt_len;
 850         int bad, count = 0;
 851         u32 status, dma_addr;
 852         unsigned long flags;
 853
 854         greth = netdev_priv(dev);
 855
 856         for (count = 0; count < limit; ++count) {
 857
 858                 bdp = greth->rx_bd_base + greth->rx_cur;
 859                 skb = greth->rx_skbuff[greth->rx_cur];
 860                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 861                 mb();
 862                 status = greth_read_bd(&bdp->stat);
 863                 bad = 0;
 864
 865                 if (status & GRETH_BD_EN)
 866                         break;
 867
 868                 /* Check status for errors. */
 869                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 870
 871                         if (status & GRETH_RXBD_ERR_FT) {
 872                                 dev->stats.rx_length_errors++;
 873                                 bad = 1;
 874                         } else if (status &
 875                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 876                                 dev->stats.rx_frame_errors++;
 877                                 bad = 1;
 878                         } else if (status & GRETH_RXBD_ERR_CRC) {
 879                                 dev->stats.rx_crc_errors++;
 880                                 bad = 1;
 881                         }
 882                 }
 883
 884                 /* Allocate new skb to replace current, not needed if the
 885                  * current skb can be reused */
 886                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 887                         skb_reserve(newskb, NET_IP_ALIGN);
 888
 889                         dma_addr = dma_map_single(greth->dev,
 890                                                       newskb->data,
 891                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 892                                                       DMA_FROM_DEVICE);
 893
 894                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 895                                 /* Process the incoming frame. */
 896                                 pkt_len = status & GRETH_BD_LEN;
 897
 898                                 dma_unmap_single(greth->dev,
 899                                                  greth_read_bd(&bdp->addr),
 900                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 901                                                  DMA_FROM_DEVICE);
 902
 903                                 if (netif_msg_pktdata(greth))
 904                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 905
 906                                 skb_put(skb, pkt_len);
 907
 908                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 909                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 910                                 else
 911                                         skb_checksum_none_assert(skb);
 912
 913                                 skb->protocol = eth_type_trans(skb, dev);
 914                                 dev->stats.rx_packets++;
 915                                 dev->stats.rx_bytes += pkt_len;
 916                                 netif_receive_skb(skb);
 917
 918                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 919                                 greth_write_bd(&bdp->addr, dma_addr);
 920                         } else {
 921                                 if (net_ratelimit())
 922                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 923                                 dev_kfree_skb(newskb);
 924                                 /* reusing current skb, so it is a drop */
 925                                 dev->stats.rx_dropped++;
 926                         }
 927                 } else if (bad) {
 928                         /* Bad Frame transfer, the skb is reused */
 929                         dev->stats.rx_dropped++;
 930                 } else {
 931                         /* Failed Allocating a new skb. This is rather stupid
 932                          * but the current "filled" skb is reused, as if
 933                          * transfer failure. One could argue that RX descriptor
 934                          * table handling should be divided into cleaning and
 935                          * filling as the TX part of the driver
 936                          */
 937                         if (net_ratelimit())
 938                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 939                         /* reusing current skb, so it is a drop */
 940                         dev->stats.rx_dropped++;
 941                 }
 942
 943                 status = GRETH_BD_EN | GRETH_BD_IE;
 944                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 945                         status |= GRETH_BD_WR;
 946                 }
 947
 948                 wmb();
 949                 greth_write_bd(&bdp->stat, status);
 950                 spin_lock_irqsave(&greth->devlock, flags);
 951                 greth_enable_rx(greth);
 952                 spin_unlock_irqrestore(&greth->devlock, flags);
 953                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 954         }
 955
 956         return count;
 957
 958 }
 959
 960 static int greth_poll(struct napi_struct *napi, int budget)
 961 {
 962         struct greth_private *greth;
 963         int work_done = 0;
 964         unsigned long flags;
 965         u32 mask, ctrl;
 966         greth = container_of(napi, struct greth_private, napi);
 967
 968 restart_txrx_poll:
 969         if (netif_queue_stopped(greth->netdev)) {
 970                 if (greth->gbit_mac)
 971                         greth_clean_tx_gbit(greth->netdev);
 972                 else
 973                         greth_clean_tx(greth->netdev);
 974         }
 975
 976         if (greth->gbit_mac) {
 977                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 978         } else {
 979                 work_done += greth_rx(greth->netdev, budget - work_done);
 980         }
 981
 982         if (work_done < budget) {
 983
 984                 spin_lock_irqsave(&greth->devlock, flags);
 985
 986                 ctrl = GRETH_REGLOAD(greth->regs->control);
 987                 if (netif_queue_stopped(greth->netdev)) {
 988                         GRETH_REGSAVE(greth->regs->control,
 989                                         ctrl | GRETH_TXI | GRETH_RXI);
 990                         mask = GRETH_INT_RX | GRETH_INT_RE |
 991                                GRETH_INT_TX | GRETH_INT_TE;
 992                 } else {
 993                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
 994                         mask = GRETH_INT_RX | GRETH_INT_RE;
 995                 }
 996
 997                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
 998                         GRETH_REGSAVE(greth->regs->control, ctrl);
 999                         spin_unlock_irqrestore(&greth->devlock, flags);
1000                         goto restart_txrx_poll;
1001                 } else {
1002                         __napi_complete(napi);
1003                         spin_unlock_irqrestore(&greth->devlock, flags);
1004                 }
1005         }
1006
1007         return work_done;
1008 }
1009
1010 static int greth_set_mac_add(struct net_device *dev, void *p)
1011 {
1012         struct sockaddr *addr = p;
1013         struct greth_private *greth;
1014         struct greth_regs *regs;
1015
1016         greth = netdev_priv(dev);
1017         regs = greth->regs;
1018
1019         if (!is_valid_ether_addr(addr->sa_data))
1020                 return -EADDRNOTAVAIL;
1021
1022         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1023         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1024         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1025                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1026
1027         return 0;
1028 }
1029
1030 static u32 greth_hash_get_index(__u8 *addr)
1031 {
1032         return (ether_crc(6, addr)) & 0x3F;
1033 }
1034
1035 static void greth_set_hash_filter(struct net_device *dev)
1036 {
1037         struct netdev_hw_addr *ha;
1038         struct greth_private *greth = netdev_priv(dev);
1039         struct greth_regs *regs = greth->regs;
1040         u32 mc_filter[2];
1041         unsigned int bitnr;
1042
1043         mc_filter[0] = mc_filter[1] = 0;
1044
1045         netdev_for_each_mc_addr(ha, dev) {
1046                 bitnr = greth_hash_get_index(ha->addr);
1047                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1048         }
1049
1050         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1051         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1052 }
1053
1054 static void greth_set_multicast_list(struct net_device *dev)
1055 {
1056         int cfg;
1057         struct greth_private *greth = netdev_priv(dev);
1058         struct greth_regs *regs = greth->regs;
1059
1060         cfg = GRETH_REGLOAD(regs->control);
1061         if (dev->flags & IFF_PROMISC)
1062                 cfg |= GRETH_CTRL_PR;
1063         else
1064                 cfg &= ~GRETH_CTRL_PR;
1065
1066         if (greth->multicast) {
1067                 if (dev->flags & IFF_ALLMULTI) {
1068                         GRETH_REGSAVE(regs->hash_msb, -1);
1069                         GRETH_REGSAVE(regs->hash_lsb, -1);
1070                         cfg |= GRETH_CTRL_MCEN;
1071                         GRETH_REGSAVE(regs->control, cfg);
1072                         return;
1073                 }
1074
1075                 if (netdev_mc_empty(dev)) {
1076                         cfg &= ~GRETH_CTRL_MCEN;
1077                         GRETH_REGSAVE(regs->control, cfg);
1078                         return;
1079                 }
1080
1081                 /* Setup multicast filter */
1082                 greth_set_hash_filter(dev);
1083                 cfg |= GRETH_CTRL_MCEN;
1084         }
1085         GRETH_REGSAVE(regs->control, cfg);
1086 }
1087
1088 static u32 greth_get_msglevel(struct net_device *dev)
1089 {
1090         struct greth_private *greth = netdev_priv(dev);
1091         return greth->msg_enable;
1092 }
1093
1094 static void greth_set_msglevel(struct net_device *dev, u32 value)
1095 {
1096         struct greth_private *greth = netdev_priv(dev);
1097         greth->msg_enable = value;
1098 }
1099 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1100 {
1101         struct greth_private *greth = netdev_priv(dev);
1102         struct phy_device *phy = greth->phy;
1103
1104         if (!phy)
1105                 return -ENODEV;
1106
1107         return phy_ethtool_gset(phy, cmd);
1108 }
1109
1110 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1111 {
1112         struct greth_private *greth = netdev_priv(dev);
1113         struct phy_device *phy = greth->phy;
1114
1115         if (!phy)
1116                 return -ENODEV;
1117
1118         return phy_ethtool_sset(phy, cmd);
1119 }
1120
1121 static int greth_get_regs_len(struct net_device *dev)
1122 {
1123         return sizeof(struct greth_regs);
1124 }
1125
1126 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1127 {
1128         struct greth_private *greth = netdev_priv(dev);
1129
1130         strlcpy(info->driver, dev_driver_string(greth->dev),
1131                 sizeof(info->driver));
1132         strlcpy(info->version, "revision: 1.0", sizeof(info->version));
1133         strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1134         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1135         info->eedump_len = 0;
1136         info->regdump_len = sizeof(struct greth_regs);
1137 }
1138
1139 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1140 {
1141         int i;
1142         struct greth_private *greth = netdev_priv(dev);
1143         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1144         u32 *buff = p;
1145
1146         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1147                 buff[i] = greth_read_bd(&greth_regs[i]);
1148 }
1149
1150 static const struct ethtool_ops greth_ethtool_ops = {
1151         .get_msglevel           = greth_get_msglevel,
1152         .set_msglevel           = greth_set_msglevel,
1153         .get_settings           = greth_get_settings,
1154         .set_settings           = greth_set_settings,
1155         .get_drvinfo            = greth_get_drvinfo,
1156         .get_regs_len           = greth_get_regs_len,
1157         .get_regs               = greth_get_regs,
1158         .get_link               = ethtool_op_get_link,
1159 };
1160
1161 static struct net_device_ops greth_netdev_ops = {
1162         .ndo_open               = greth_open,
1163         .ndo_stop               = greth_close,
1164         .ndo_start_xmit         = greth_start_xmit,
1165         .ndo_set_mac_address    = greth_set_mac_add,
1166         .ndo_validate_addr      = eth_validate_addr,
1167 };
1168
1169 static inline int wait_for_mdio(struct greth_private *greth)
1170 {
1171         unsigned long timeout = jiffies + 4*HZ/100;
1172         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1173                 if (time_after(jiffies, timeout))
1174                         return 0;
1175         }
1176         return 1;
1177 }
1178
1179 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1180 {
1181         struct greth_private *greth = bus->priv;
1182         int data;
1183
1184         if (!wait_for_mdio(greth))
1185                 return -EBUSY;
1186
1187         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1188
1189         if (!wait_for_mdio(greth))
1190                 return -EBUSY;
1191
1192         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1193                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1194                 return data;
1195
1196         } else {
1197                 return -1;
1198         }
1199 }
1200
1201 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1202 {
1203         struct greth_private *greth = bus->priv;
1204
1205         if (!wait_for_mdio(greth))
1206                 return -EBUSY;
1207
1208         GRETH_REGSAVE(greth->regs->mdio,
1209                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1210
1211         if (!wait_for_mdio(greth))
1212                 return -EBUSY;
1213
1214         return 0;
1215 }
1216
1217 static int greth_mdio_reset(struct mii_bus *bus)
1218 {
1219         return 0;
1220 }
1221
1222 static void greth_link_change(struct net_device *dev)
1223 {
1224         struct greth_private *greth = netdev_priv(dev);
1225         struct phy_device *phydev = greth->phy;
1226         unsigned long flags;
1227         int status_change = 0;
1228         u32 ctrl;
1229
1230         spin_lock_irqsave(&greth->devlock, flags);
1231
1232         if (phydev->link) {
1233
1234                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1235                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1236                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1237
1238                         if (phydev->duplex)
1239                                 ctrl |= GRETH_CTRL_FD;
1240
1241                         if (phydev->speed == SPEED_100)
1242                                 ctrl |= GRETH_CTRL_SP;
1243                         else if (phydev->speed == SPEED_1000)
1244                                 ctrl |= GRETH_CTRL_GB;
1245
1246                         GRETH_REGSAVE(greth->regs->control, ctrl);
1247                         greth->speed = phydev->speed;
1248                         greth->duplex = phydev->duplex;
1249                         status_change = 1;
1250                 }
1251         }
1252
1253         if (phydev->link != greth->link) {
1254                 if (!phydev->link) {
1255                         greth->speed = 0;
1256                         greth->duplex = -1;
1257                 }
1258                 greth->link = phydev->link;
1259
1260                 status_change = 1;
1261         }
1262
1263         spin_unlock_irqrestore(&greth->devlock, flags);
1264
1265         if (status_change) {
1266                 if (phydev->link)
1267                         pr_debug("%s: link up (%d/%s)\n",
1268                                 dev->name, phydev->speed,
1269                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1270                 else
1271                         pr_debug("%s: link down\n", dev->name);
1272         }
1273 }
1274
1275 static int greth_mdio_probe(struct net_device *dev)
1276 {
1277         struct greth_private *greth = netdev_priv(dev);
1278         struct phy_device *phy = NULL;
1279         int ret;
1280
1281         /* Find the first PHY */
1282         phy = phy_find_first(greth->mdio);
1283
1284         if (!phy) {
1285                 if (netif_msg_probe(greth))
1286                         dev_err(&dev->dev, "no PHY found\n");
1287                 return -ENXIO;
1288         }
1289
1290         ret = phy_connect_direct(dev, phy, &greth_link_change,
1291                                  greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1292         if (ret) {
1293                 if (netif_msg_ifup(greth))
1294                         dev_err(&dev->dev, "could not attach to PHY\n");
1295                 return ret;
1296         }
1297
1298         if (greth->gbit_mac)
1299                 phy->supported &= PHY_GBIT_FEATURES;
1300         else
1301                 phy->supported &= PHY_BASIC_FEATURES;
1302
1303         phy->advertising = phy->supported;
1304
1305         greth->link = 0;
1306         greth->speed = 0;
1307         greth->duplex = -1;
1308         greth->phy = phy;
1309
1310         return 0;
1311 }
1312
1313 static inline int phy_aneg_done(struct phy_device *phydev)
1314 {
1315         int retval;
1316
1317         retval = phy_read(phydev, MII_BMSR);
1318
1319         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1320 }
1321
1322 static int greth_mdio_init(struct greth_private *greth)
1323 {
1324         int ret, phy;
1325         unsigned long timeout;
1326
1327         greth->mdio = mdiobus_alloc();
1328         if (!greth->mdio) {
1329                 return -ENOMEM;
1330         }
1331
1332         greth->mdio->name = "greth-mdio";
1333         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1334         greth->mdio->read = greth_mdio_read;
1335         greth->mdio->write = greth_mdio_write;
1336         greth->mdio->reset = greth_mdio_reset;
1337         greth->mdio->priv = greth;
1338
1339         greth->mdio->irq = greth->mdio_irqs;
1340
1341         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1342                 greth->mdio->irq[phy] = PHY_POLL;
1343
1344         ret = mdiobus_register(greth->mdio);
1345         if (ret) {
1346                 goto error;
1347         }
1348
1349         ret = greth_mdio_probe(greth->netdev);
1350         if (ret) {
1351                 if (netif_msg_probe(greth))
1352                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1353                 goto unreg_mdio;
1354         }
1355
1356         phy_start(greth->phy);
1357
1358         /* If Ethernet debug link is used make autoneg happen right away */
1359         if (greth->edcl && greth_edcl == 1) {
1360                 phy_start_aneg(greth->phy);
1361                 timeout = jiffies + 6*HZ;
1362                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1363                 }
1364                 phy_read_status(greth->phy);
1365                 greth_link_change(greth->netdev);
1366         }
1367
1368         return 0;
1369
1370 unreg_mdio:
1371         mdiobus_unregister(greth->mdio);
1372 error:
1373         mdiobus_free(greth->mdio);
1374         return ret;
1375 }
1376
1377 /* Initialize the GRETH MAC */
1378 static int greth_of_probe(struct platform_device *ofdev)
1379 {
1380         struct net_device *dev;
1381         struct greth_private *greth;
1382         struct greth_regs *regs;
1383
1384         int i;
1385         int err;
1386         int tmp;
1387         unsigned long timeout;
1388
1389         dev = alloc_etherdev(sizeof(struct greth_private));
1390
1391         if (dev == NULL)
1392                 return -ENOMEM;
1393
1394         greth = netdev_priv(dev);
1395         greth->netdev = dev;
1396         greth->dev = &ofdev->dev;
1397
1398         if (greth_debug > 0)
1399                 greth->msg_enable = greth_debug;
1400         else
1401                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1402
1403         spin_lock_init(&greth->devlock);
1404
1405         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1406                                  resource_size(&ofdev->resource[0]),
1407                                  "grlib-greth regs");
1408
1409         if (greth->regs == NULL) {
1410                 if (netif_msg_probe(greth))
1411                         dev_err(greth->dev, "ioremap failure.\n");
1412                 err = -EIO;
1413                 goto error1;
1414         }
1415
1416         regs = greth->regs;
1417         greth->irq = ofdev->archdata.irqs[0];
1418
1419         dev_set_drvdata(greth->dev, dev);
1420         SET_NETDEV_DEV(dev, greth->dev);
1421
1422         if (netif_msg_probe(greth))
1423                 dev_dbg(greth->dev, "resetting controller.\n");
1424
1425         /* Reset the controller. */
1426         GRETH_REGSAVE(regs->control, GRETH_RESET);
1427
1428         /* Wait for MAC to reset itself */
1429         timeout = jiffies + HZ/100;
1430         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1431                 if (time_after(jiffies, timeout)) {
1432                         err = -EIO;
1433                         if (netif_msg_probe(greth))
1434                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1435                         goto error2;
1436                 }
1437         }
1438
1439         /* Get default PHY address  */
1440         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1441
1442         /* Check if we have GBIT capable MAC */
1443         tmp = GRETH_REGLOAD(regs->control);
1444         greth->gbit_mac = (tmp >> 27) & 1;
1445
1446         /* Check for multicast capability */
1447         greth->multicast = (tmp >> 25) & 1;
1448
1449         greth->edcl = (tmp >> 31) & 1;
1450
1451         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1452          * it doesn't interfere with the software */
1453         if (greth->edcl != 0)
1454                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1455
1456         /* Check if MAC can handle MDIO interrupts */
1457         greth->mdio_int_en = (tmp >> 26) & 1;
1458
1459         err = greth_mdio_init(greth);
1460         if (err) {
1461                 if (netif_msg_probe(greth))
1462                         dev_err(greth->dev, "failed to register MDIO bus\n");
1463                 goto error2;
1464         }
1465
1466         /* Allocate TX descriptor ring in coherent memory */
1467         greth->tx_bd_base = dma_zalloc_coherent(greth->dev, 1024,
1468                                                 &greth->tx_bd_base_phys,
1469                                                 GFP_KERNEL);
1470         if (!greth->tx_bd_base) {
1471                 err = -ENOMEM;
1472                 goto error3;
1473         }
1474
1475         /* Allocate RX descriptor ring in coherent memory */
1476         greth->rx_bd_base = dma_zalloc_coherent(greth->dev, 1024,
1477                                                 &greth->rx_bd_base_phys,
1478                                                 GFP_KERNEL);
1479         if (!greth->rx_bd_base) {
1480                 err = -ENOMEM;
1481                 goto error4;
1482         }
1483
1484         /* Get MAC address from: module param, OF property or ID prom */
1485         for (i = 0; i < 6; i++) {
1486                 if (macaddr[i] != 0)
1487                         break;
1488         }
1489         if (i == 6) {
1490                 const unsigned char *addr;
1491                 int len;
1492                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1493                                         &len);
1494                 if (addr != NULL && len == 6) {
1495                         for (i = 0; i < 6; i++)
1496                                 macaddr[i] = (unsigned int) addr[i];
1497                 } else {
1498 #ifdef CONFIG_SPARC
1499                         for (i = 0; i < 6; i++)
1500                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1501 #endif
1502                 }
1503         }
1504
1505         for (i = 0; i < 6; i++)
1506                 dev->dev_addr[i] = macaddr[i];
1507
1508         macaddr[5]++;
1509
1510         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1511                 if (netif_msg_probe(greth))
1512                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1513                 err = -EINVAL;
1514                 goto error5;
1515         }
1516
1517         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1518         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1519                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1520
1521         /* Clear all pending interrupts except PHY irq */
1522         GRETH_REGSAVE(regs->status, 0xFF);
1523
1524         if (greth->gbit_mac) {
1525                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1526                         NETIF_F_RXCSUM;
1527                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1528                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1529         }
1530
1531         if (greth->multicast) {
1532                 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1533                 dev->flags |= IFF_MULTICAST;
1534         } else {
1535                 dev->flags &= ~IFF_MULTICAST;
1536         }
1537
1538         dev->netdev_ops = &greth_netdev_ops;
1539         dev->ethtool_ops = &greth_ethtool_ops;
1540
1541         err = register_netdev(dev);
1542         if (err) {
1543                 if (netif_msg_probe(greth))
1544                         dev_err(greth->dev, "netdevice registration failed.\n");
1545                 goto error5;
1546         }
1547
1548         /* setup NAPI */
1549         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1550
1551         return 0;
1552
1553 error5:
1554         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1555 error4:
1556         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1557 error3:
1558         mdiobus_unregister(greth->mdio);
1559 error2:
1560         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1561 error1:
1562         free_netdev(dev);
1563         return err;
1564 }
1565
1566 static int greth_of_remove(struct platform_device *of_dev)
1567 {
1568         struct net_device *ndev = platform_get_drvdata(of_dev);
1569         struct greth_private *greth = netdev_priv(ndev);
1570
1571         /* Free descriptor areas */
1572         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1573
1574         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1575
1576         if (greth->phy)
1577                 phy_stop(greth->phy);
1578         mdiobus_unregister(greth->mdio);
1579
1580         unregister_netdev(ndev);
1581         free_netdev(ndev);
1582
1583         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1584
1585         return 0;
1586 }
1587
1588 static struct of_device_id greth_of_match[] = {
1589         {
1590          .name = "GAISLER_ETHMAC",
1591          },
1592         {
1593          .name = "01_01d",
1594          },
1595         {},
1596 };
1597
1598 MODULE_DEVICE_TABLE(of, greth_of_match);
1599
1600 static struct platform_driver greth_of_driver = {
1601         .driver = {
1602                 .name = "grlib-greth",
1603                 .owner = THIS_MODULE,
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");