drivers/net/ethernet/aeroflex/greth.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
   4  *
   5  * 2005-2010 (c) Aeroflex Gaisler AB
   6  *
   7  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
   8  * available in the GRLIB VHDL IP core library.
   9  *
  10  * Full documentation of both cores can be found here:
  11  * https://www.gaisler.com/products/grlib/grip.pdf
  12  *
  13  * The Gigabit version supports scatter/gather DMA, any alignment of
  14  * buffers and checksum offloading.
  15  *
  16  * Contributors: Kristoffer Glembo
  17  *               Daniel Hellstrom
  18  *               Marko Isomaki
  19  */
  20
  21 #include <linux/dma-mapping.h>
  22 #include <linux/module.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/io.h>
  30 #include <linux/crc32.h>
  31 #include <linux/mii.h>
  32 #include <linux/of_device.h>
  33 #include <linux/of_net.h>
  34 #include <linux/of_platform.h>
  35 #include <linux/slab.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/byteorder.h>
  38
  39 #ifdef CONFIG_SPARC
  40 #include <asm/idprom.h>
  41 #endif
  42
  43 #include "greth.h"
  44
  45 #define GRETH_DEF_MSG_ENABLE      \
  46         (NETIF_MSG_DRV          | \
  47          NETIF_MSG_PROBE        | \
  48          NETIF_MSG_LINK         | \
  49          NETIF_MSG_IFDOWN       | \
  50          NETIF_MSG_IFUP         | \
  51          NETIF_MSG_RX_ERR       | \
  52          NETIF_MSG_TX_ERR)
  53
  54 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  55 module_param(greth_debug, int, 0);
  56 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  57
  58 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  59 static int macaddr[6];
  60 module_param_array(macaddr, int, NULL, 0);
  61 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  62
  63 static int greth_edcl = 1;
  64 module_param(greth_edcl, int, 0);
  65 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  66
  67 static int greth_open(struct net_device *dev);
  68 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  69            struct net_device *dev);
  70 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  71            struct net_device *dev);
  72 static int greth_rx(struct net_device *dev, int limit);
  73 static int greth_rx_gbit(struct net_device *dev, int limit);
  74 static void greth_clean_tx(struct net_device *dev);
  75 static void greth_clean_tx_gbit(struct net_device *dev);
  76 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  77 static int greth_close(struct net_device *dev);
  78 static int greth_set_mac_add(struct net_device *dev, void *p);
  79 static void greth_set_multicast_list(struct net_device *dev);
  80
  81 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  82 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  83 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  84 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  85
  86 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  87 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  88 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  89
  90 static void greth_print_rx_packet(void *addr, int len)
  91 {
  92         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  93                         addr, len, true);
  94 }
  95
  96 static void greth_print_tx_packet(struct sk_buff *skb)
  97 {
  98         int i;
  99         int length;
 100
 101         if (skb_shinfo(skb)->nr_frags == 0)
 102                 length = skb->len;
 103         else
 104                 length = skb_headlen(skb);
 105
 106         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 107                         skb->data, length, true);
 108
 109         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 110
 111                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 112                                skb_frag_address(&skb_shinfo(skb)->frags[i]),
 113                                skb_frag_size(&skb_shinfo(skb)->frags[i]), true);
 114         }
 115 }
 116
 117 static inline void greth_enable_tx(struct greth_private *greth)
 118 {
 119         wmb();
 120         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 121 }
 122
 123 static inline void greth_enable_tx_and_irq(struct greth_private *greth)
 124 {
 125         wmb(); /* BDs must been written to memory before enabling TX */
 126         GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
 127 }
 128
 129 static inline void greth_disable_tx(struct greth_private *greth)
 130 {
 131         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 132 }
 133
 134 static inline void greth_enable_rx(struct greth_private *greth)
 135 {
 136         wmb();
 137         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 138 }
 139
 140 static inline void greth_disable_rx(struct greth_private *greth)
 141 {
 142         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 143 }
 144
 145 static inline void greth_enable_irqs(struct greth_private *greth)
 146 {
 147         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 148 }
 149
 150 static inline void greth_disable_irqs(struct greth_private *greth)
 151 {
 152         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 153 }
 154
 155 static inline void greth_write_bd(u32 *bd, u32 val)
 156 {
 157         __raw_writel(cpu_to_be32(val), bd);
 158 }
 159
 160 static inline u32 greth_read_bd(u32 *bd)
 161 {
 162         return be32_to_cpu(__raw_readl(bd));
 163 }
 164
 165 static void greth_clean_rings(struct greth_private *greth)
 166 {
 167         int i;
 168         struct greth_bd *rx_bdp = greth->rx_bd_base;
 169         struct greth_bd *tx_bdp = greth->tx_bd_base;
 170
 171         if (greth->gbit_mac) {
 172
 173                 /* Free and unmap RX buffers */
 174                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 175                         if (greth->rx_skbuff[i] != NULL) {
 176                                 dev_kfree_skb(greth->rx_skbuff[i]);
 177                                 dma_unmap_single(greth->dev,
 178                                                  greth_read_bd(&rx_bdp->addr),
 179                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 180                                                  DMA_FROM_DEVICE);
 181                         }
 182                 }
 183
 184                 /* TX buffers */
 185                 while (greth->tx_free < GRETH_TXBD_NUM) {
 186
 187                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 188                         int nr_frags = skb_shinfo(skb)->nr_frags;
 189                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 190                         greth->tx_last = NEXT_TX(greth->tx_last);
 191
 192                         dma_unmap_single(greth->dev,
 193                                          greth_read_bd(&tx_bdp->addr),
 194                                          skb_headlen(skb),
 195                                          DMA_TO_DEVICE);
 196
 197                         for (i = 0; i < nr_frags; i++) {
 198                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 199                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 200
 201                                 dma_unmap_page(greth->dev,
 202                                                greth_read_bd(&tx_bdp->addr),
 203                                                skb_frag_size(frag),
 204                                                DMA_TO_DEVICE);
 205
 206                                 greth->tx_last = NEXT_TX(greth->tx_last);
 207                         }
 208                         greth->tx_free += nr_frags+1;
 209                         dev_kfree_skb(skb);
 210                 }
 211
 212
 213         } else { /* 10/100 Mbps MAC */
 214
 215                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 216                         kfree(greth->rx_bufs[i]);
 217                         dma_unmap_single(greth->dev,
 218                                          greth_read_bd(&rx_bdp->addr),
 219                                          MAX_FRAME_SIZE,
 220                                          DMA_FROM_DEVICE);
 221                 }
 222                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 223                         kfree(greth->tx_bufs[i]);
 224                         dma_unmap_single(greth->dev,
 225                                          greth_read_bd(&tx_bdp->addr),
 226                                          MAX_FRAME_SIZE,
 227                                          DMA_TO_DEVICE);
 228                 }
 229         }
 230 }
 231
 232 static int greth_init_rings(struct greth_private *greth)
 233 {
 234         struct sk_buff *skb;
 235         struct greth_bd *rx_bd, *tx_bd;
 236         u32 dma_addr;
 237         int i;
 238
 239         rx_bd = greth->rx_bd_base;
 240         tx_bd = greth->tx_bd_base;
 241
 242         /* Initialize descriptor rings and buffers */
 243         if (greth->gbit_mac) {
 244
 245                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 246                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 247                         if (skb == NULL) {
 248                                 if (netif_msg_ifup(greth))
 249                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 250                                 goto cleanup;
 251                         }
 252                         skb_reserve(skb, NET_IP_ALIGN);
 253                         dma_addr = dma_map_single(greth->dev,
 254                                                   skb->data,
 255                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 256                                                   DMA_FROM_DEVICE);
 257
 258                         if (dma_mapping_error(greth->dev, dma_addr)) {
 259                                 if (netif_msg_ifup(greth))
 260                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 261                                 goto cleanup;
 262                         }
 263                         greth->rx_skbuff[i] = skb;
 264                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 265                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 266                 }
 267
 268         } else {
 269
 270                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 271                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 272
 273                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 274
 275                         if (greth->rx_bufs[i] == NULL) {
 276                                 if (netif_msg_ifup(greth))
 277                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 278                                 goto cleanup;
 279                         }
 280
 281                         dma_addr = dma_map_single(greth->dev,
 282                                                   greth->rx_bufs[i],
 283                                                   MAX_FRAME_SIZE,
 284                                                   DMA_FROM_DEVICE);
 285
 286                         if (dma_mapping_error(greth->dev, dma_addr)) {
 287                                 if (netif_msg_ifup(greth))
 288                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 289                                 goto cleanup;
 290                         }
 291                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 292                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 293                 }
 294                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 295
 296                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 297
 298                         if (greth->tx_bufs[i] == NULL) {
 299                                 if (netif_msg_ifup(greth))
 300                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 301                                 goto cleanup;
 302                         }
 303
 304                         dma_addr = dma_map_single(greth->dev,
 305                                                   greth->tx_bufs[i],
 306                                                   MAX_FRAME_SIZE,
 307                                                   DMA_TO_DEVICE);
 308
 309                         if (dma_mapping_error(greth->dev, dma_addr)) {
 310                                 if (netif_msg_ifup(greth))
 311                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 312                                 goto cleanup;
 313                         }
 314                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 315                         greth_write_bd(&tx_bd[i].stat, 0);
 316                 }
 317         }
 318         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 319                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 320
 321         /* Initialize pointers. */
 322         greth->rx_cur = 0;
 323         greth->tx_next = 0;
 324         greth->tx_last = 0;
 325         greth->tx_free = GRETH_TXBD_NUM;
 326
 327         /* Initialize descriptor base address */
 328         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 329         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 330
 331         return 0;
 332
 333 cleanup:
 334         greth_clean_rings(greth);
 335         return -ENOMEM;
 336 }
 337
 338 static int greth_open(struct net_device *dev)
 339 {
 340         struct greth_private *greth = netdev_priv(dev);
 341         int err;
 342
 343         err = greth_init_rings(greth);
 344         if (err) {
 345                 if (netif_msg_ifup(greth))
 346                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 347                 return err;
 348         }
 349
 350         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 351         if (err) {
 352                 if (netif_msg_ifup(greth))
 353                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 354                 greth_clean_rings(greth);
 355                 return err;
 356         }
 357
 358         if (netif_msg_ifup(greth))
 359                 dev_dbg(&dev->dev, " starting queue\n");
 360         netif_start_queue(dev);
 361
 362         GRETH_REGSAVE(greth->regs->status, 0xFF);
 363
 364         napi_enable(&greth->napi);
 365
 366         greth_enable_irqs(greth);
 367         greth_enable_tx(greth);
 368         greth_enable_rx(greth);
 369         return 0;
 370
 371 }
 372
 373 static int greth_close(struct net_device *dev)
 374 {
 375         struct greth_private *greth = netdev_priv(dev);
 376
 377         napi_disable(&greth->napi);
 378
 379         greth_disable_irqs(greth);
 380         greth_disable_tx(greth);
 381         greth_disable_rx(greth);
 382
 383         netif_stop_queue(dev);
 384
 385         free_irq(greth->irq, (void *) dev);
 386
 387         greth_clean_rings(greth);
 388
 389         return 0;
 390 }
 391
 392 static netdev_tx_t
 393 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 394 {
 395         struct greth_private *greth = netdev_priv(dev);
 396         struct greth_bd *bdp;
 397         int err = NETDEV_TX_OK;
 398         u32 status, dma_addr, ctrl;
 399         unsigned long flags;
 400
 401         /* Clean TX Ring */
 402         greth_clean_tx(greth->netdev);
 403
 404         if (unlikely(greth->tx_free <= 0)) {
 405                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 406                 ctrl = GRETH_REGLOAD(greth->regs->control);
 407                 /* Enable TX IRQ only if not already in poll() routine */
 408                 if (ctrl & GRETH_RXI)
 409                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 410                 netif_stop_queue(dev);
 411                 spin_unlock_irqrestore(&greth->devlock, flags);
 412                 return NETDEV_TX_BUSY;
 413         }
 414
 415         if (netif_msg_pktdata(greth))
 416                 greth_print_tx_packet(skb);
 417
 418
 419         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 420                 dev->stats.tx_errors++;
 421                 goto out;
 422         }
 423
 424         bdp = greth->tx_bd_base + greth->tx_next;
 425         dma_addr = greth_read_bd(&bdp->addr);
 426
 427         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 428
 429         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 430
 431         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 432         greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
 433
 434         /* Wrap around descriptor ring */
 435         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 436                 status |= GRETH_BD_WR;
 437         }
 438
 439         greth->tx_next = NEXT_TX(greth->tx_next);
 440         greth->tx_free--;
 441
 442         /* Write descriptor control word and enable transmission */
 443         greth_write_bd(&bdp->stat, status);
 444         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 445         greth_enable_tx(greth);
 446         spin_unlock_irqrestore(&greth->devlock, flags);
 447
 448 out:
 449         dev_kfree_skb(skb);
 450         return err;
 451 }
 452
 453 static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
 454 {
 455         if (tx_next < tx_last)
 456                 return (tx_last - tx_next) - 1;
 457         else
 458                 return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
 459 }
 460
 461 static netdev_tx_t
 462 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 463 {
 464         struct greth_private *greth = netdev_priv(dev);
 465         struct greth_bd *bdp;
 466         u32 status, dma_addr;
 467         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 468         unsigned long flags;
 469         u16 tx_last;
 470
 471         nr_frags = skb_shinfo(skb)->nr_frags;
 472         tx_last = greth->tx_last;
 473         rmb(); /* tx_last is updated by the poll task */
 474
 475         if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
 476                 netif_stop_queue(dev);
 477                 err = NETDEV_TX_BUSY;
 478                 goto out;
 479         }
 480
 481         if (netif_msg_pktdata(greth))
 482                 greth_print_tx_packet(skb);
 483
 484         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 485                 dev->stats.tx_errors++;
 486                 goto out;
 487         }
 488
 489         /* Save skb pointer. */
 490         greth->tx_skbuff[greth->tx_next] = skb;
 491
 492         /* Linear buf */
 493         if (nr_frags != 0)
 494                 status = GRETH_TXBD_MORE;
 495         else
 496                 status = GRETH_BD_IE;
 497
 498         if (skb->ip_summed == CHECKSUM_PARTIAL)
 499                 status |= GRETH_TXBD_CSALL;
 500         status |= skb_headlen(skb) & GRETH_BD_LEN;
 501         if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 502                 status |= GRETH_BD_WR;
 503
 504
 505         bdp = greth->tx_bd_base + greth->tx_next;
 506         greth_write_bd(&bdp->stat, status);
 507         dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
 508
 509         if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 510                 goto map_error;
 511
 512         greth_write_bd(&bdp->addr, dma_addr);
 513
 514         curr_tx = NEXT_TX(greth->tx_next);
 515
 516         /* Frags */
 517         for (i = 0; i < nr_frags; i++) {
 518                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 519                 greth->tx_skbuff[curr_tx] = NULL;
 520                 bdp = greth->tx_bd_base + curr_tx;
 521
 522                 status = GRETH_BD_EN;
 523                 if (skb->ip_summed == CHECKSUM_PARTIAL)
 524                         status |= GRETH_TXBD_CSALL;
 525                 status |= skb_frag_size(frag) & GRETH_BD_LEN;
 526
 527                 /* Wrap around descriptor ring */
 528                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 529                         status |= GRETH_BD_WR;
 530
 531                 /* More fragments left */
 532                 if (i < nr_frags - 1)
 533                         status |= GRETH_TXBD_MORE;
 534                 else
 535                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 536
 537                 greth_write_bd(&bdp->stat, status);
 538
 539                 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
 540                                             DMA_TO_DEVICE);
 541
 542                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 543                         goto frag_map_error;
 544
 545                 greth_write_bd(&bdp->addr, dma_addr);
 546
 547                 curr_tx = NEXT_TX(curr_tx);
 548         }
 549
 550         wmb();
 551
 552         /* Enable the descriptor chain by enabling the first descriptor */
 553         bdp = greth->tx_bd_base + greth->tx_next;
 554         greth_write_bd(&bdp->stat,
 555                        greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 556
 557         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 558         greth->tx_next = curr_tx;
 559         greth_enable_tx_and_irq(greth);
 560         spin_unlock_irqrestore(&greth->devlock, flags);
 561
 562         return NETDEV_TX_OK;
 563
 564 frag_map_error:
 565         /* Unmap SKB mappings that succeeded and disable descriptor */
 566         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 567                 bdp = greth->tx_bd_base + greth->tx_next + i;
 568                 dma_unmap_single(greth->dev,
 569                                  greth_read_bd(&bdp->addr),
 570                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 571                                  DMA_TO_DEVICE);
 572                 greth_write_bd(&bdp->stat, 0);
 573         }
 574 map_error:
 575         if (net_ratelimit())
 576                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 577         dev_kfree_skb(skb);
 578 out:
 579         return err;
 580 }
 581
 582 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 583 {
 584         struct net_device *dev = dev_id;
 585         struct greth_private *greth;
 586         u32 status, ctrl;
 587         irqreturn_t retval = IRQ_NONE;
 588
 589         greth = netdev_priv(dev);
 590
 591         spin_lock(&greth->devlock);
 592
 593         /* Get the interrupt events that caused us to be here. */
 594         status = GRETH_REGLOAD(greth->regs->status);
 595
 596         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 597          * set regardless of whether IRQ is enabled or not. Especially
 598          * important when shared IRQ.
 599          */
 600         ctrl = GRETH_REGLOAD(greth->regs->control);
 601
 602         /* Handle rx and tx interrupts through poll */
 603         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 604             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 605                 retval = IRQ_HANDLED;
 606
 607                 /* Disable interrupts and schedule poll() */
 608                 greth_disable_irqs(greth);
 609                 napi_schedule(&greth->napi);
 610         }
 611
 612         spin_unlock(&greth->devlock);
 613
 614         return retval;
 615 }
 616
 617 static void greth_clean_tx(struct net_device *dev)
 618 {
 619         struct greth_private *greth;
 620         struct greth_bd *bdp;
 621         u32 stat;
 622
 623         greth = netdev_priv(dev);
 624
 625         while (1) {
 626                 bdp = greth->tx_bd_base + greth->tx_last;
 627                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 628                 mb();
 629                 stat = greth_read_bd(&bdp->stat);
 630
 631                 if (unlikely(stat & GRETH_BD_EN))
 632                         break;
 633
 634                 if (greth->tx_free == GRETH_TXBD_NUM)
 635                         break;
 636
 637                 /* Check status for errors */
 638                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 639                         dev->stats.tx_errors++;
 640                         if (stat & GRETH_TXBD_ERR_AL)
 641                                 dev->stats.tx_aborted_errors++;
 642                         if (stat & GRETH_TXBD_ERR_UE)
 643                                 dev->stats.tx_fifo_errors++;
 644                 }
 645                 dev->stats.tx_packets++;
 646                 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
 647                 greth->tx_last = NEXT_TX(greth->tx_last);
 648                 greth->tx_free++;
 649         }
 650
 651         if (greth->tx_free > 0) {
 652                 netif_wake_queue(dev);
 653         }
 654 }
 655
 656 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
 657 {
 658         /* Check status for errors */
 659         if (unlikely(stat & GRETH_TXBD_STATUS)) {
 660                 dev->stats.tx_errors++;
 661                 if (stat & GRETH_TXBD_ERR_AL)
 662                         dev->stats.tx_aborted_errors++;
 663                 if (stat & GRETH_TXBD_ERR_UE)
 664                         dev->stats.tx_fifo_errors++;
 665                 if (stat & GRETH_TXBD_ERR_LC)
 666                         dev->stats.tx_aborted_errors++;
 667         }
 668         dev->stats.tx_packets++;
 669 }
 670
 671 static void greth_clean_tx_gbit(struct net_device *dev)
 672 {
 673         struct greth_private *greth;
 674         struct greth_bd *bdp, *bdp_last_frag;
 675         struct sk_buff *skb = NULL;
 676         u32 stat;
 677         int nr_frags, i;
 678         u16 tx_last;
 679
 680         greth = netdev_priv(dev);
 681         tx_last = greth->tx_last;
 682
 683         while (tx_last != greth->tx_next) {
 684
 685                 skb = greth->tx_skbuff[tx_last];
 686
 687                 nr_frags = skb_shinfo(skb)->nr_frags;
 688
 689                 /* We only clean fully completed SKBs */
 690                 bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
 691
 692                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 693                 mb();
 694                 stat = greth_read_bd(&bdp_last_frag->stat);
 695
 696                 if (stat & GRETH_BD_EN)
 697                         break;
 698
 699                 greth->tx_skbuff[tx_last] = NULL;
 700
 701                 greth_update_tx_stats(dev, stat);
 702                 dev->stats.tx_bytes += skb->len;
 703
 704                 bdp = greth->tx_bd_base + tx_last;
 705
 706                 tx_last = NEXT_TX(tx_last);
 707
 708                 dma_unmap_single(greth->dev,
 709                                  greth_read_bd(&bdp->addr),
 710                                  skb_headlen(skb),
 711                                  DMA_TO_DEVICE);
 712
 713                 for (i = 0; i < nr_frags; i++) {
 714                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 715                         bdp = greth->tx_bd_base + tx_last;
 716
 717                         dma_unmap_page(greth->dev,
 718                                        greth_read_bd(&bdp->addr),
 719                                        skb_frag_size(frag),
 720                                        DMA_TO_DEVICE);
 721
 722                         tx_last = NEXT_TX(tx_last);
 723                 }
 724                 dev_kfree_skb(skb);
 725         }
 726         if (skb) { /* skb is set only if the above while loop was entered */
 727                 wmb();
 728                 greth->tx_last = tx_last;
 729
 730                 if (netif_queue_stopped(dev) &&
 731                     (greth_num_free_bds(tx_last, greth->tx_next) >
 732                     (MAX_SKB_FRAGS+1)))
 733                         netif_wake_queue(dev);
 734         }
 735 }
 736
 737 static int greth_rx(struct net_device *dev, int limit)
 738 {
 739         struct greth_private *greth;
 740         struct greth_bd *bdp;
 741         struct sk_buff *skb;
 742         int pkt_len;
 743         int bad, count;
 744         u32 status, dma_addr;
 745         unsigned long flags;
 746
 747         greth = netdev_priv(dev);
 748
 749         for (count = 0; count < limit; ++count) {
 750
 751                 bdp = greth->rx_bd_base + greth->rx_cur;
 752                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 753                 mb();
 754                 status = greth_read_bd(&bdp->stat);
 755
 756                 if (unlikely(status & GRETH_BD_EN)) {
 757                         break;
 758                 }
 759
 760                 dma_addr = greth_read_bd(&bdp->addr);
 761                 bad = 0;
 762
 763                 /* Check status for errors. */
 764                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 765                         if (status & GRETH_RXBD_ERR_FT) {
 766                                 dev->stats.rx_length_errors++;
 767                                 bad = 1;
 768                         }
 769                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 770                                 dev->stats.rx_frame_errors++;
 771                                 bad = 1;
 772                         }
 773                         if (status & GRETH_RXBD_ERR_CRC) {
 774                                 dev->stats.rx_crc_errors++;
 775                                 bad = 1;
 776                         }
 777                 }
 778                 if (unlikely(bad)) {
 779                         dev->stats.rx_errors++;
 780
 781                 } else {
 782
 783                         pkt_len = status & GRETH_BD_LEN;
 784
 785                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 786
 787                         if (unlikely(skb == NULL)) {
 788
 789                                 if (net_ratelimit())
 790                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 791
 792                                 dev->stats.rx_dropped++;
 793
 794                         } else {
 795                                 skb_reserve(skb, NET_IP_ALIGN);
 796
 797                                 dma_sync_single_for_cpu(greth->dev,
 798                                                         dma_addr,
 799                                                         pkt_len,
 800                                                         DMA_FROM_DEVICE);
 801
 802                                 if (netif_msg_pktdata(greth))
 803                                         greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
 804
 805                                 skb_put_data(skb, phys_to_virt(dma_addr),
 806                                              pkt_len);
 807
 808                                 skb->protocol = eth_type_trans(skb, dev);
 809                                 dev->stats.rx_bytes += pkt_len;
 810                                 dev->stats.rx_packets++;
 811                                 netif_receive_skb(skb);
 812                         }
 813                 }
 814
 815                 status = GRETH_BD_EN | GRETH_BD_IE;
 816                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 817                         status |= GRETH_BD_WR;
 818                 }
 819
 820                 wmb();
 821                 greth_write_bd(&bdp->stat, status);
 822
 823                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 824
 825                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 826                 greth_enable_rx(greth);
 827                 spin_unlock_irqrestore(&greth->devlock, flags);
 828
 829                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 830         }
 831
 832         return count;
 833 }
 834
 835 static inline int hw_checksummed(u32 status)
 836 {
 837
 838         if (status & GRETH_RXBD_IP_FRAG)
 839                 return 0;
 840
 841         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 842                 return 0;
 843
 844         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 845                 return 0;
 846
 847         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 848                 return 0;
 849
 850         return 1;
 851 }
 852
 853 static int greth_rx_gbit(struct net_device *dev, int limit)
 854 {
 855         struct greth_private *greth;
 856         struct greth_bd *bdp;
 857         struct sk_buff *skb, *newskb;
 858         int pkt_len;
 859         int bad, count = 0;
 860         u32 status, dma_addr;
 861         unsigned long flags;
 862
 863         greth = netdev_priv(dev);
 864
 865         for (count = 0; count < limit; ++count) {
 866
 867                 bdp = greth->rx_bd_base + greth->rx_cur;
 868                 skb = greth->rx_skbuff[greth->rx_cur];
 869                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 870                 mb();
 871                 status = greth_read_bd(&bdp->stat);
 872                 bad = 0;
 873
 874                 if (status & GRETH_BD_EN)
 875                         break;
 876
 877                 /* Check status for errors. */
 878                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 879
 880                         if (status & GRETH_RXBD_ERR_FT) {
 881                                 dev->stats.rx_length_errors++;
 882                                 bad = 1;
 883                         } else if (status &
 884                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 885                                 dev->stats.rx_frame_errors++;
 886                                 bad = 1;
 887                         } else if (status & GRETH_RXBD_ERR_CRC) {
 888                                 dev->stats.rx_crc_errors++;
 889                                 bad = 1;
 890                         }
 891                 }
 892
 893                 /* Allocate new skb to replace current, not needed if the
 894                  * current skb can be reused */
 895                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 896                         skb_reserve(newskb, NET_IP_ALIGN);
 897
 898                         dma_addr = dma_map_single(greth->dev,
 899                                                       newskb->data,
 900                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 901                                                       DMA_FROM_DEVICE);
 902
 903                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 904                                 /* Process the incoming frame. */
 905                                 pkt_len = status & GRETH_BD_LEN;
 906
 907                                 dma_unmap_single(greth->dev,
 908                                                  greth_read_bd(&bdp->addr),
 909                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 910                                                  DMA_FROM_DEVICE);
 911
 912                                 if (netif_msg_pktdata(greth))
 913                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 914
 915                                 skb_put(skb, pkt_len);
 916
 917                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 918                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 919                                 else
 920                                         skb_checksum_none_assert(skb);
 921
 922                                 skb->protocol = eth_type_trans(skb, dev);
 923                                 dev->stats.rx_packets++;
 924                                 dev->stats.rx_bytes += pkt_len;
 925                                 netif_receive_skb(skb);
 926
 927                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 928                                 greth_write_bd(&bdp->addr, dma_addr);
 929                         } else {
 930                                 if (net_ratelimit())
 931                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 932                                 dev_kfree_skb(newskb);
 933                                 /* reusing current skb, so it is a drop */
 934                                 dev->stats.rx_dropped++;
 935                         }
 936                 } else if (bad) {
 937                         /* Bad Frame transfer, the skb is reused */
 938                         dev->stats.rx_dropped++;
 939                 } else {
 940                         /* Failed Allocating a new skb. This is rather stupid
 941                          * but the current "filled" skb is reused, as if
 942                          * transfer failure. One could argue that RX descriptor
 943                          * table handling should be divided into cleaning and
 944                          * filling as the TX part of the driver
 945                          */
 946                         if (net_ratelimit())
 947                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 948                         /* reusing current skb, so it is a drop */
 949                         dev->stats.rx_dropped++;
 950                 }
 951
 952                 status = GRETH_BD_EN | GRETH_BD_IE;
 953                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 954                         status |= GRETH_BD_WR;
 955                 }
 956
 957                 wmb();
 958                 greth_write_bd(&bdp->stat, status);
 959                 spin_lock_irqsave(&greth->devlock, flags);
 960                 greth_enable_rx(greth);
 961                 spin_unlock_irqrestore(&greth->devlock, flags);
 962                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 963         }
 964
 965         return count;
 966
 967 }
 968
 969 static int greth_poll(struct napi_struct *napi, int budget)
 970 {
 971         struct greth_private *greth;
 972         int work_done = 0;
 973         unsigned long flags;
 974         u32 mask, ctrl;
 975         greth = container_of(napi, struct greth_private, napi);
 976
 977 restart_txrx_poll:
 978         if (greth->gbit_mac) {
 979                 greth_clean_tx_gbit(greth->netdev);
 980                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 981         } else {
 982                 if (netif_queue_stopped(greth->netdev))
 983                         greth_clean_tx(greth->netdev);
 984                 work_done += greth_rx(greth->netdev, budget - work_done);
 985         }
 986
 987         if (work_done < budget) {
 988
 989                 spin_lock_irqsave(&greth->devlock, flags);
 990
 991                 ctrl = GRETH_REGLOAD(greth->regs->control);
 992                 if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
 993                     (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
 994                         GRETH_REGSAVE(greth->regs->control,
 995                                         ctrl | GRETH_TXI | GRETH_RXI);
 996                         mask = GRETH_INT_RX | GRETH_INT_RE |
 997                                GRETH_INT_TX | GRETH_INT_TE;
 998                 } else {
 999                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
1000                         mask = GRETH_INT_RX | GRETH_INT_RE;
1001                 }
1002
1003                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1004                         GRETH_REGSAVE(greth->regs->control, ctrl);
1005                         spin_unlock_irqrestore(&greth->devlock, flags);
1006                         goto restart_txrx_poll;
1007                 } else {
1008                         napi_complete_done(napi, work_done);
1009                         spin_unlock_irqrestore(&greth->devlock, flags);
1010                 }
1011         }
1012
1013         return work_done;
1014 }
1015
1016 static int greth_set_mac_add(struct net_device *dev, void *p)
1017 {
1018         struct sockaddr *addr = p;
1019         struct greth_private *greth;
1020         struct greth_regs *regs;
1021
1022         greth = netdev_priv(dev);
1023         regs = greth->regs;
1024
1025         if (!is_valid_ether_addr(addr->sa_data))
1026                 return -EADDRNOTAVAIL;
1027
1028         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1029         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1030         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1031                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1032
1033         return 0;
1034 }
1035
1036 static u32 greth_hash_get_index(__u8 *addr)
1037 {
1038         return (ether_crc(6, addr)) & 0x3F;
1039 }
1040
1041 static void greth_set_hash_filter(struct net_device *dev)
1042 {
1043         struct netdev_hw_addr *ha;
1044         struct greth_private *greth = netdev_priv(dev);
1045         struct greth_regs *regs = greth->regs;
1046         u32 mc_filter[2];
1047         unsigned int bitnr;
1048
1049         mc_filter[0] = mc_filter[1] = 0;
1050
1051         netdev_for_each_mc_addr(ha, dev) {
1052                 bitnr = greth_hash_get_index(ha->addr);
1053                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1054         }
1055
1056         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1057         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1058 }
1059
1060 static void greth_set_multicast_list(struct net_device *dev)
1061 {
1062         int cfg;
1063         struct greth_private *greth = netdev_priv(dev);
1064         struct greth_regs *regs = greth->regs;
1065
1066         cfg = GRETH_REGLOAD(regs->control);
1067         if (dev->flags & IFF_PROMISC)
1068                 cfg |= GRETH_CTRL_PR;
1069         else
1070                 cfg &= ~GRETH_CTRL_PR;
1071
1072         if (greth->multicast) {
1073                 if (dev->flags & IFF_ALLMULTI) {
1074                         GRETH_REGSAVE(regs->hash_msb, -1);
1075                         GRETH_REGSAVE(regs->hash_lsb, -1);
1076                         cfg |= GRETH_CTRL_MCEN;
1077                         GRETH_REGSAVE(regs->control, cfg);
1078                         return;
1079                 }
1080
1081                 if (netdev_mc_empty(dev)) {
1082                         cfg &= ~GRETH_CTRL_MCEN;
1083                         GRETH_REGSAVE(regs->control, cfg);
1084                         return;
1085                 }
1086
1087                 /* Setup multicast filter */
1088                 greth_set_hash_filter(dev);
1089                 cfg |= GRETH_CTRL_MCEN;
1090         }
1091         GRETH_REGSAVE(regs->control, cfg);
1092 }
1093
1094 static u32 greth_get_msglevel(struct net_device *dev)
1095 {
1096         struct greth_private *greth = netdev_priv(dev);
1097         return greth->msg_enable;
1098 }
1099
1100 static void greth_set_msglevel(struct net_device *dev, u32 value)
1101 {
1102         struct greth_private *greth = netdev_priv(dev);
1103         greth->msg_enable = value;
1104 }
1105
1106 static int greth_get_regs_len(struct net_device *dev)
1107 {
1108         return sizeof(struct greth_regs);
1109 }
1110
1111 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1112 {
1113         struct greth_private *greth = netdev_priv(dev);
1114
1115         strlcpy(info->driver, dev_driver_string(greth->dev),
1116                 sizeof(info->driver));
1117         strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1118 }
1119
1120 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1121 {
1122         int i;
1123         struct greth_private *greth = netdev_priv(dev);
1124         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1125         u32 *buff = p;
1126
1127         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1128                 buff[i] = greth_read_bd(&greth_regs[i]);
1129 }
1130
1131 static const struct ethtool_ops greth_ethtool_ops = {
1132         .get_msglevel           = greth_get_msglevel,
1133         .set_msglevel           = greth_set_msglevel,
1134         .get_drvinfo            = greth_get_drvinfo,
1135         .get_regs_len           = greth_get_regs_len,
1136         .get_regs               = greth_get_regs,
1137         .get_link               = ethtool_op_get_link,
1138         .get_link_ksettings     = phy_ethtool_get_link_ksettings,
1139         .set_link_ksettings     = phy_ethtool_set_link_ksettings,
1140 };
1141
1142 static struct net_device_ops greth_netdev_ops = {
1143         .ndo_open               = greth_open,
1144         .ndo_stop               = greth_close,
1145         .ndo_start_xmit         = greth_start_xmit,
1146         .ndo_set_mac_address    = greth_set_mac_add,
1147         .ndo_validate_addr      = eth_validate_addr,
1148 };
1149
1150 static inline int wait_for_mdio(struct greth_private *greth)
1151 {
1152         unsigned long timeout = jiffies + 4*HZ/100;
1153         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1154                 if (time_after(jiffies, timeout))
1155                         return 0;
1156         }
1157         return 1;
1158 }
1159
1160 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1161 {
1162         struct greth_private *greth = bus->priv;
1163         int data;
1164
1165         if (!wait_for_mdio(greth))
1166                 return -EBUSY;
1167
1168         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1169
1170         if (!wait_for_mdio(greth))
1171                 return -EBUSY;
1172
1173         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1174                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1175                 return data;
1176
1177         } else {
1178                 return -1;
1179         }
1180 }
1181
1182 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1183 {
1184         struct greth_private *greth = bus->priv;
1185
1186         if (!wait_for_mdio(greth))
1187                 return -EBUSY;
1188
1189         GRETH_REGSAVE(greth->regs->mdio,
1190                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1191
1192         if (!wait_for_mdio(greth))
1193                 return -EBUSY;
1194
1195         return 0;
1196 }
1197
1198 static void greth_link_change(struct net_device *dev)
1199 {
1200         struct greth_private *greth = netdev_priv(dev);
1201         struct phy_device *phydev = dev->phydev;
1202         unsigned long flags;
1203         int status_change = 0;
1204         u32 ctrl;
1205
1206         spin_lock_irqsave(&greth->devlock, flags);
1207
1208         if (phydev->link) {
1209
1210                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1211                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1212                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1213
1214                         if (phydev->duplex)
1215                                 ctrl |= GRETH_CTRL_FD;
1216
1217                         if (phydev->speed == SPEED_100)
1218                                 ctrl |= GRETH_CTRL_SP;
1219                         else if (phydev->speed == SPEED_1000)
1220                                 ctrl |= GRETH_CTRL_GB;
1221
1222                         GRETH_REGSAVE(greth->regs->control, ctrl);
1223                         greth->speed = phydev->speed;
1224                         greth->duplex = phydev->duplex;
1225                         status_change = 1;
1226                 }
1227         }
1228
1229         if (phydev->link != greth->link) {
1230                 if (!phydev->link) {
1231                         greth->speed = 0;
1232                         greth->duplex = -1;
1233                 }
1234                 greth->link = phydev->link;
1235
1236                 status_change = 1;
1237         }
1238
1239         spin_unlock_irqrestore(&greth->devlock, flags);
1240
1241         if (status_change) {
1242                 if (phydev->link)
1243                         pr_debug("%s: link up (%d/%s)\n",
1244                                 dev->name, phydev->speed,
1245                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1246                 else
1247                         pr_debug("%s: link down\n", dev->name);
1248         }
1249 }
1250
1251 static int greth_mdio_probe(struct net_device *dev)
1252 {
1253         struct greth_private *greth = netdev_priv(dev);
1254         struct phy_device *phy = NULL;
1255         int ret;
1256
1257         /* Find the first PHY */
1258         phy = phy_find_first(greth->mdio);
1259
1260         if (!phy) {
1261                 if (netif_msg_probe(greth))
1262                         dev_err(&dev->dev, "no PHY found\n");
1263                 return -ENXIO;
1264         }
1265
1266         ret = phy_connect_direct(dev, phy, &greth_link_change,
1267                                  greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1268         if (ret) {
1269                 if (netif_msg_ifup(greth))
1270                         dev_err(&dev->dev, "could not attach to PHY\n");
1271                 return ret;
1272         }
1273
1274         if (greth->gbit_mac)
1275                 phy_set_max_speed(phy, SPEED_1000);
1276         else
1277                 phy_set_max_speed(phy, SPEED_100);
1278
1279         linkmode_copy(phy->advertising, phy->supported);
1280
1281         greth->link = 0;
1282         greth->speed = 0;
1283         greth->duplex = -1;
1284
1285         return 0;
1286 }
1287
1288 static int greth_mdio_init(struct greth_private *greth)
1289 {
1290         int ret;
1291         unsigned long timeout;
1292         struct net_device *ndev = greth->netdev;
1293
1294         greth->mdio = mdiobus_alloc();
1295         if (!greth->mdio) {
1296                 return -ENOMEM;
1297         }
1298
1299         greth->mdio->name = "greth-mdio";
1300         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1301         greth->mdio->read = greth_mdio_read;
1302         greth->mdio->write = greth_mdio_write;
1303         greth->mdio->priv = greth;
1304
1305         ret = mdiobus_register(greth->mdio);
1306         if (ret) {
1307                 goto error;
1308         }
1309
1310         ret = greth_mdio_probe(greth->netdev);
1311         if (ret) {
1312                 if (netif_msg_probe(greth))
1313                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1314                 goto unreg_mdio;
1315         }
1316
1317         phy_start(ndev->phydev);
1318
1319         /* If Ethernet debug link is used make autoneg happen right away */
1320         if (greth->edcl && greth_edcl == 1) {
1321                 phy_start_aneg(ndev->phydev);
1322                 timeout = jiffies + 6*HZ;
1323                 while (!phy_aneg_done(ndev->phydev) &&
1324                        time_before(jiffies, timeout)) {
1325                 }
1326                 phy_read_status(ndev->phydev);
1327                 greth_link_change(greth->netdev);
1328         }
1329
1330         return 0;
1331
1332 unreg_mdio:
1333         mdiobus_unregister(greth->mdio);
1334 error:
1335         mdiobus_free(greth->mdio);
1336         return ret;
1337 }
1338
1339 /* Initialize the GRETH MAC */
1340 static int greth_of_probe(struct platform_device *ofdev)
1341 {
1342         struct net_device *dev;
1343         struct greth_private *greth;
1344         struct greth_regs *regs;
1345
1346         int i;
1347         int err;
1348         int tmp;
1349         unsigned long timeout;
1350
1351         dev = alloc_etherdev(sizeof(struct greth_private));
1352
1353         if (dev == NULL)
1354                 return -ENOMEM;
1355
1356         greth = netdev_priv(dev);
1357         greth->netdev = dev;
1358         greth->dev = &ofdev->dev;
1359
1360         if (greth_debug > 0)
1361                 greth->msg_enable = greth_debug;
1362         else
1363                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1364
1365         spin_lock_init(&greth->devlock);
1366
1367         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1368                                  resource_size(&ofdev->resource[0]),
1369                                  "grlib-greth regs");
1370
1371         if (greth->regs == NULL) {
1372                 if (netif_msg_probe(greth))
1373                         dev_err(greth->dev, "ioremap failure.\n");
1374                 err = -EIO;
1375                 goto error1;
1376         }
1377
1378         regs = greth->regs;
1379         greth->irq = ofdev->archdata.irqs[0];
1380
1381         dev_set_drvdata(greth->dev, dev);
1382         SET_NETDEV_DEV(dev, greth->dev);
1383
1384         if (netif_msg_probe(greth))
1385                 dev_dbg(greth->dev, "resetting controller.\n");
1386
1387         /* Reset the controller. */
1388         GRETH_REGSAVE(regs->control, GRETH_RESET);
1389
1390         /* Wait for MAC to reset itself */
1391         timeout = jiffies + HZ/100;
1392         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1393                 if (time_after(jiffies, timeout)) {
1394                         err = -EIO;
1395                         if (netif_msg_probe(greth))
1396                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1397                         goto error2;
1398                 }
1399         }
1400
1401         /* Get default PHY address  */
1402         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1403
1404         /* Check if we have GBIT capable MAC */
1405         tmp = GRETH_REGLOAD(regs->control);
1406         greth->gbit_mac = (tmp >> 27) & 1;
1407
1408         /* Check for multicast capability */
1409         greth->multicast = (tmp >> 25) & 1;
1410
1411         greth->edcl = (tmp >> 31) & 1;
1412
1413         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1414          * it doesn't interfere with the software */
1415         if (greth->edcl != 0)
1416                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1417
1418         /* Check if MAC can handle MDIO interrupts */
1419         greth->mdio_int_en = (tmp >> 26) & 1;
1420
1421         err = greth_mdio_init(greth);
1422         if (err) {
1423                 if (netif_msg_probe(greth))
1424                         dev_err(greth->dev, "failed to register MDIO bus\n");
1425                 goto error2;
1426         }
1427
1428         /* Allocate TX descriptor ring in coherent memory */
1429         greth->tx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1430                                                &greth->tx_bd_base_phys,
1431                                                GFP_KERNEL);
1432         if (!greth->tx_bd_base) {
1433                 err = -ENOMEM;
1434                 goto error3;
1435         }
1436
1437         /* Allocate RX descriptor ring in coherent memory */
1438         greth->rx_bd_base = dma_alloc_coherent(greth->dev, 1024,
1439                                                &greth->rx_bd_base_phys,
1440                                                GFP_KERNEL);
1441         if (!greth->rx_bd_base) {
1442                 err = -ENOMEM;
1443                 goto error4;
1444         }
1445
1446         /* Get MAC address from: module param, OF property or ID prom */
1447         for (i = 0; i < 6; i++) {
1448                 if (macaddr[i] != 0)
1449                         break;
1450         }
1451         if (i == 6) {
1452                 const u8 *addr;
1453
1454                 addr = of_get_mac_address(ofdev->dev.of_node);
1455                 if (!IS_ERR(addr)) {
1456                         for (i = 0; i < 6; i++)
1457                                 macaddr[i] = (unsigned int) addr[i];
1458                 } else {
1459 #ifdef CONFIG_SPARC
1460                         for (i = 0; i < 6; i++)
1461                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1462 #endif
1463                 }
1464         }
1465
1466         for (i = 0; i < 6; i++)
1467                 dev->dev_addr[i] = macaddr[i];
1468
1469         macaddr[5]++;
1470
1471         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1472                 if (netif_msg_probe(greth))
1473                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1474                 err = -EINVAL;
1475                 goto error5;
1476         }
1477
1478         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1479         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1480                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1481
1482         /* Clear all pending interrupts except PHY irq */
1483         GRETH_REGSAVE(regs->status, 0xFF);
1484
1485         if (greth->gbit_mac) {
1486                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1487                         NETIF_F_RXCSUM;
1488                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1489                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1490         }
1491
1492         if (greth->multicast) {
1493                 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1494                 dev->flags |= IFF_MULTICAST;
1495         } else {
1496                 dev->flags &= ~IFF_MULTICAST;
1497         }
1498
1499         dev->netdev_ops = &greth_netdev_ops;
1500         dev->ethtool_ops = &greth_ethtool_ops;
1501
1502         err = register_netdev(dev);
1503         if (err) {
1504                 if (netif_msg_probe(greth))
1505                         dev_err(greth->dev, "netdevice registration failed.\n");
1506                 goto error5;
1507         }
1508
1509         /* setup NAPI */
1510         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1511
1512         return 0;
1513
1514 error5:
1515         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1516 error4:
1517         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1518 error3:
1519         mdiobus_unregister(greth->mdio);
1520 error2:
1521         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1522 error1:
1523         free_netdev(dev);
1524         return err;
1525 }
1526
1527 static int greth_of_remove(struct platform_device *of_dev)
1528 {
1529         struct net_device *ndev = platform_get_drvdata(of_dev);
1530         struct greth_private *greth = netdev_priv(ndev);
1531
1532         /* Free descriptor areas */
1533         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1534
1535         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1536
1537         if (ndev->phydev)
1538                 phy_stop(ndev->phydev);
1539         mdiobus_unregister(greth->mdio);
1540
1541         unregister_netdev(ndev);
1542         free_netdev(ndev);
1543
1544         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1545
1546         return 0;
1547 }
1548
1549 static const struct of_device_id greth_of_match[] = {
1550         {
1551          .name = "GAISLER_ETHMAC",
1552          },
1553         {
1554          .name = "01_01d",
1555          },
1556         {},
1557 };
1558
1559 MODULE_DEVICE_TABLE(of, greth_of_match);
1560
1561 static struct platform_driver greth_of_driver = {
1562         .driver = {
1563                 .name = "grlib-greth",
1564                 .of_match_table = greth_of_match,
1565         },
1566         .probe = greth_of_probe,
1567         .remove = greth_of_remove,
1568 };
1569
1570 module_platform_driver(greth_of_driver);
1571
1572 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1573 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1574 MODULE_LICENSE("GPL");