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