drivers/net/greth.c

   1 /*
   2  * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
   3  *
   4  * 2005-2010 (c) Aeroflex Gaisler AB
   5  *
   6  * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
   7  * available in the GRLIB VHDL IP core library.
   8  *
   9  * Full documentation of both cores can be found here:
  10  * http://www.gaisler.com/products/grlib/grip.pdf
  11  *
  12  * The Gigabit version supports scatter/gather DMA, any alignment of
  13  * buffers and checksum offloading.
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the
  17  * Free Software Foundation; either version 2 of the License, or (at your
  18  * option) any later version.
  19  *
  20  * Contributors: Kristoffer Glembo
  21  *               Daniel Hellstrom
  22  *               Marko Isomaki
  23  */
  24
  25 #include <linux/dma-mapping.h>
  26 #include <linux/module.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/io.h>
  35 #include <linux/crc32.h>
  36 #include <linux/mii.h>
  37 #include <linux/of_device.h>
  38 #include <linux/of_platform.h>
  39 #include <linux/slab.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/byteorder.h>
  42
  43 #ifdef CONFIG_SPARC
  44 #include <asm/idprom.h>
  45 #endif
  46
  47 #include "greth.h"
  48
  49 #define GRETH_DEF_MSG_ENABLE      \
  50         (NETIF_MSG_DRV          | \
  51          NETIF_MSG_PROBE        | \
  52          NETIF_MSG_LINK         | \
  53          NETIF_MSG_IFDOWN       | \
  54          NETIF_MSG_IFUP         | \
  55          NETIF_MSG_RX_ERR       | \
  56          NETIF_MSG_TX_ERR)
  57
  58 static int greth_debug = -1;    /* -1 == use GRETH_DEF_MSG_ENABLE as value */
  59 module_param(greth_debug, int, 0);
  60 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
  61
  62 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
  63 static int macaddr[6];
  64 module_param_array(macaddr, int, NULL, 0);
  65 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
  66
  67 static int greth_edcl = 1;
  68 module_param(greth_edcl, int, 0);
  69 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
  70
  71 static int greth_open(struct net_device *dev);
  72 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
  73            struct net_device *dev);
  74 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
  75            struct net_device *dev);
  76 static int greth_rx(struct net_device *dev, int limit);
  77 static int greth_rx_gbit(struct net_device *dev, int limit);
  78 static void greth_clean_tx(struct net_device *dev);
  79 static void greth_clean_tx_gbit(struct net_device *dev);
  80 static irqreturn_t greth_interrupt(int irq, void *dev_id);
  81 static int greth_close(struct net_device *dev);
  82 static int greth_set_mac_add(struct net_device *dev, void *p);
  83 static void greth_set_multicast_list(struct net_device *dev);
  84
  85 #define GRETH_REGLOAD(a)            (be32_to_cpu(__raw_readl(&(a))))
  86 #define GRETH_REGSAVE(a, v)         (__raw_writel(cpu_to_be32(v), &(a)))
  87 #define GRETH_REGORIN(a, v)         (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
  88 #define GRETH_REGANDIN(a, v)        (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
  89
  90 #define NEXT_TX(N)      (((N) + 1) & GRETH_TXBD_NUM_MASK)
  91 #define SKIP_TX(N, C)   (((N) + C) & GRETH_TXBD_NUM_MASK)
  92 #define NEXT_RX(N)      (((N) + 1) & GRETH_RXBD_NUM_MASK)
  93
  94 static void greth_print_rx_packet(void *addr, int len)
  95 {
  96         print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
  97                         addr, len, true);
  98 }
  99
 100 static void greth_print_tx_packet(struct sk_buff *skb)
 101 {
 102         int i;
 103         int length;
 104
 105         if (skb_shinfo(skb)->nr_frags == 0)
 106                 length = skb->len;
 107         else
 108                 length = skb_headlen(skb);
 109
 110         print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 111                         skb->data, length, true);
 112
 113         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 114
 115                 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
 116                                phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
 117                                skb_shinfo(skb)->frags[i].page_offset,
 118                                length, true);
 119         }
 120 }
 121
 122 static inline void greth_enable_tx(struct greth_private *greth)
 123 {
 124         wmb();
 125         GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
 126 }
 127
 128 static inline void greth_disable_tx(struct greth_private *greth)
 129 {
 130         GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
 131 }
 132
 133 static inline void greth_enable_rx(struct greth_private *greth)
 134 {
 135         wmb();
 136         GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
 137 }
 138
 139 static inline void greth_disable_rx(struct greth_private *greth)
 140 {
 141         GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
 142 }
 143
 144 static inline void greth_enable_irqs(struct greth_private *greth)
 145 {
 146         GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
 147 }
 148
 149 static inline void greth_disable_irqs(struct greth_private *greth)
 150 {
 151         GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
 152 }
 153
 154 static inline void greth_write_bd(u32 *bd, u32 val)
 155 {
 156         __raw_writel(cpu_to_be32(val), bd);
 157 }
 158
 159 static inline u32 greth_read_bd(u32 *bd)
 160 {
 161         return be32_to_cpu(__raw_readl(bd));
 162 }
 163
 164 static void greth_clean_rings(struct greth_private *greth)
 165 {
 166         int i;
 167         struct greth_bd *rx_bdp = greth->rx_bd_base;
 168         struct greth_bd *tx_bdp = greth->tx_bd_base;
 169
 170         if (greth->gbit_mac) {
 171
 172                 /* Free and unmap RX buffers */
 173                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 174                         if (greth->rx_skbuff[i] != NULL) {
 175                                 dev_kfree_skb(greth->rx_skbuff[i]);
 176                                 dma_unmap_single(greth->dev,
 177                                                  greth_read_bd(&rx_bdp->addr),
 178                                                  MAX_FRAME_SIZE+NET_IP_ALIGN,
 179                                                  DMA_FROM_DEVICE);
 180                         }
 181                 }
 182
 183                 /* TX buffers */
 184                 while (greth->tx_free < GRETH_TXBD_NUM) {
 185
 186                         struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
 187                         int nr_frags = skb_shinfo(skb)->nr_frags;
 188                         tx_bdp = greth->tx_bd_base + greth->tx_last;
 189                         greth->tx_last = NEXT_TX(greth->tx_last);
 190
 191                         dma_unmap_single(greth->dev,
 192                                          greth_read_bd(&tx_bdp->addr),
 193                                          skb_headlen(skb),
 194                                          DMA_TO_DEVICE);
 195
 196                         for (i = 0; i < nr_frags; i++) {
 197                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 198                                 tx_bdp = greth->tx_bd_base + greth->tx_last;
 199
 200                                 dma_unmap_page(greth->dev,
 201                                                greth_read_bd(&tx_bdp->addr),
 202                                                frag->size,
 203                                                DMA_TO_DEVICE);
 204
 205                                 greth->tx_last = NEXT_TX(greth->tx_last);
 206                         }
 207                         greth->tx_free += nr_frags+1;
 208                         dev_kfree_skb(skb);
 209                 }
 210
 211
 212         } else { /* 10/100 Mbps MAC */
 213
 214                 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
 215                         kfree(greth->rx_bufs[i]);
 216                         dma_unmap_single(greth->dev,
 217                                          greth_read_bd(&rx_bdp->addr),
 218                                          MAX_FRAME_SIZE,
 219                                          DMA_FROM_DEVICE);
 220                 }
 221                 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
 222                         kfree(greth->tx_bufs[i]);
 223                         dma_unmap_single(greth->dev,
 224                                          greth_read_bd(&tx_bdp->addr),
 225                                          MAX_FRAME_SIZE,
 226                                          DMA_TO_DEVICE);
 227                 }
 228         }
 229 }
 230
 231 static int greth_init_rings(struct greth_private *greth)
 232 {
 233         struct sk_buff *skb;
 234         struct greth_bd *rx_bd, *tx_bd;
 235         u32 dma_addr;
 236         int i;
 237
 238         rx_bd = greth->rx_bd_base;
 239         tx_bd = greth->tx_bd_base;
 240
 241         /* Initialize descriptor rings and buffers */
 242         if (greth->gbit_mac) {
 243
 244                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 245                         skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
 246                         if (skb == NULL) {
 247                                 if (netif_msg_ifup(greth))
 248                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 249                                 goto cleanup;
 250                         }
 251                         skb_reserve(skb, NET_IP_ALIGN);
 252                         dma_addr = dma_map_single(greth->dev,
 253                                                   skb->data,
 254                                                   MAX_FRAME_SIZE+NET_IP_ALIGN,
 255                                                   DMA_FROM_DEVICE);
 256
 257                         if (dma_mapping_error(greth->dev, dma_addr)) {
 258                                 if (netif_msg_ifup(greth))
 259                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 260                                 goto cleanup;
 261                         }
 262                         greth->rx_skbuff[i] = skb;
 263                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 264                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 265                 }
 266
 267         } else {
 268
 269                 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
 270                 for (i = 0; i < GRETH_RXBD_NUM; i++) {
 271
 272                         greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 273
 274                         if (greth->rx_bufs[i] == NULL) {
 275                                 if (netif_msg_ifup(greth))
 276                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 277                                 goto cleanup;
 278                         }
 279
 280                         dma_addr = dma_map_single(greth->dev,
 281                                                   greth->rx_bufs[i],
 282                                                   MAX_FRAME_SIZE,
 283                                                   DMA_FROM_DEVICE);
 284
 285                         if (dma_mapping_error(greth->dev, dma_addr)) {
 286                                 if (netif_msg_ifup(greth))
 287                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 288                                 goto cleanup;
 289                         }
 290                         greth_write_bd(&rx_bd[i].addr, dma_addr);
 291                         greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
 292                 }
 293                 for (i = 0; i < GRETH_TXBD_NUM; i++) {
 294
 295                         greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
 296
 297                         if (greth->tx_bufs[i] == NULL) {
 298                                 if (netif_msg_ifup(greth))
 299                                         dev_err(greth->dev, "Error allocating DMA ring.\n");
 300                                 goto cleanup;
 301                         }
 302
 303                         dma_addr = dma_map_single(greth->dev,
 304                                                   greth->tx_bufs[i],
 305                                                   MAX_FRAME_SIZE,
 306                                                   DMA_TO_DEVICE);
 307
 308                         if (dma_mapping_error(greth->dev, dma_addr)) {
 309                                 if (netif_msg_ifup(greth))
 310                                         dev_err(greth->dev, "Could not create initial DMA mapping\n");
 311                                 goto cleanup;
 312                         }
 313                         greth_write_bd(&tx_bd[i].addr, dma_addr);
 314                         greth_write_bd(&tx_bd[i].stat, 0);
 315                 }
 316         }
 317         greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
 318                        greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
 319
 320         /* Initialize pointers. */
 321         greth->rx_cur = 0;
 322         greth->tx_next = 0;
 323         greth->tx_last = 0;
 324         greth->tx_free = GRETH_TXBD_NUM;
 325
 326         /* Initialize descriptor base address */
 327         GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
 328         GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
 329
 330         return 0;
 331
 332 cleanup:
 333         greth_clean_rings(greth);
 334         return -ENOMEM;
 335 }
 336
 337 static int greth_open(struct net_device *dev)
 338 {
 339         struct greth_private *greth = netdev_priv(dev);
 340         int err;
 341
 342         err = greth_init_rings(greth);
 343         if (err) {
 344                 if (netif_msg_ifup(greth))
 345                         dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
 346                 return err;
 347         }
 348
 349         err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
 350         if (err) {
 351                 if (netif_msg_ifup(greth))
 352                         dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
 353                 greth_clean_rings(greth);
 354                 return err;
 355         }
 356
 357         if (netif_msg_ifup(greth))
 358                 dev_dbg(&dev->dev, " starting queue\n");
 359         netif_start_queue(dev);
 360
 361         GRETH_REGSAVE(greth->regs->status, 0xFF);
 362
 363         napi_enable(&greth->napi);
 364
 365         greth_enable_irqs(greth);
 366         greth_enable_tx(greth);
 367         greth_enable_rx(greth);
 368         return 0;
 369
 370 }
 371
 372 static int greth_close(struct net_device *dev)
 373 {
 374         struct greth_private *greth = netdev_priv(dev);
 375
 376         napi_disable(&greth->napi);
 377
 378         greth_disable_irqs(greth);
 379         greth_disable_tx(greth);
 380         greth_disable_rx(greth);
 381
 382         netif_stop_queue(dev);
 383
 384         free_irq(greth->irq, (void *) dev);
 385
 386         greth_clean_rings(greth);
 387
 388         return 0;
 389 }
 390
 391 static netdev_tx_t
 392 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 393 {
 394         struct greth_private *greth = netdev_priv(dev);
 395         struct greth_bd *bdp;
 396         int err = NETDEV_TX_OK;
 397         u32 status, dma_addr, ctrl;
 398         unsigned long flags;
 399
 400         /* Clean TX Ring */
 401         greth_clean_tx(greth->netdev);
 402
 403         if (unlikely(greth->tx_free <= 0)) {
 404                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 405                 ctrl = GRETH_REGLOAD(greth->regs->control);
 406                 /* Enable TX IRQ only if not already in poll() routine */
 407                 if (ctrl & GRETH_RXI)
 408                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 409                 netif_stop_queue(dev);
 410                 spin_unlock_irqrestore(&greth->devlock, flags);
 411                 return NETDEV_TX_BUSY;
 412         }
 413
 414         if (netif_msg_pktdata(greth))
 415                 greth_print_tx_packet(skb);
 416
 417
 418         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 419                 dev->stats.tx_errors++;
 420                 goto out;
 421         }
 422
 423         bdp = greth->tx_bd_base + greth->tx_next;
 424         dma_addr = greth_read_bd(&bdp->addr);
 425
 426         memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
 427
 428         dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
 429
 430         status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
 431
 432         /* Wrap around descriptor ring */
 433         if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
 434                 status |= GRETH_BD_WR;
 435         }
 436
 437         greth->tx_next = NEXT_TX(greth->tx_next);
 438         greth->tx_free--;
 439
 440         /* Write descriptor control word and enable transmission */
 441         greth_write_bd(&bdp->stat, status);
 442         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 443         greth_enable_tx(greth);
 444         spin_unlock_irqrestore(&greth->devlock, flags);
 445
 446 out:
 447         dev_kfree_skb(skb);
 448         return err;
 449 }
 450
 451
 452 static netdev_tx_t
 453 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 454 {
 455         struct greth_private *greth = netdev_priv(dev);
 456         struct greth_bd *bdp;
 457         u32 status = 0, dma_addr, ctrl;
 458         int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
 459         unsigned long flags;
 460
 461         nr_frags = skb_shinfo(skb)->nr_frags;
 462
 463         /* Clean TX Ring */
 464         greth_clean_tx_gbit(dev);
 465
 466         if (greth->tx_free < nr_frags + 1) {
 467                 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
 468                 ctrl = GRETH_REGLOAD(greth->regs->control);
 469                 /* Enable TX IRQ only if not already in poll() routine */
 470                 if (ctrl & GRETH_RXI)
 471                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
 472                 netif_stop_queue(dev);
 473                 spin_unlock_irqrestore(&greth->devlock, flags);
 474                 err = NETDEV_TX_BUSY;
 475                 goto out;
 476         }
 477
 478         if (netif_msg_pktdata(greth))
 479                 greth_print_tx_packet(skb);
 480
 481         if (unlikely(skb->len > MAX_FRAME_SIZE)) {
 482                 dev->stats.tx_errors++;
 483                 goto out;
 484         }
 485
 486         /* Save skb pointer. */
 487         greth->tx_skbuff[greth->tx_next] = skb;
 488
 489         /* Linear buf */
 490         if (nr_frags != 0)
 491                 status = GRETH_TXBD_MORE;
 492
 493         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_TXBD_CSALL | GRETH_BD_EN;
 517                 status |= frag->size & GRETH_BD_LEN;
 518
 519                 /* Wrap around descriptor ring */
 520                 if (curr_tx == GRETH_TXBD_NUM_MASK)
 521                         status |= GRETH_BD_WR;
 522
 523                 /* More fragments left */
 524                 if (i < nr_frags - 1)
 525                         status |= GRETH_TXBD_MORE;
 526                 else
 527                         status |= GRETH_BD_IE; /* enable IRQ on last fragment */
 528
 529                 greth_write_bd(&bdp->stat, status);
 530
 531                 dma_addr = dma_map_page(greth->dev,
 532                                         frag->page,
 533                                         frag->page_offset,
 534                                         frag->size,
 535                                         DMA_TO_DEVICE);
 536
 537                 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
 538                         goto frag_map_error;
 539
 540                 greth_write_bd(&bdp->addr, dma_addr);
 541
 542                 curr_tx = NEXT_TX(curr_tx);
 543         }
 544
 545         wmb();
 546
 547         /* Enable the descriptor chain by enabling the first descriptor */
 548         bdp = greth->tx_bd_base + greth->tx_next;
 549         greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
 550         greth->tx_next = curr_tx;
 551         greth->tx_free -= nr_frags + 1;
 552
 553         wmb();
 554
 555         spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
 556         greth_enable_tx(greth);
 557         spin_unlock_irqrestore(&greth->devlock, flags);
 558
 559         return NETDEV_TX_OK;
 560
 561 frag_map_error:
 562         /* Unmap SKB mappings that succeeded and disable descriptor */
 563         for (i = 0; greth->tx_next + i != curr_tx; i++) {
 564                 bdp = greth->tx_bd_base + greth->tx_next + i;
 565                 dma_unmap_single(greth->dev,
 566                                  greth_read_bd(&bdp->addr),
 567                                  greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 568                                  DMA_TO_DEVICE);
 569                 greth_write_bd(&bdp->stat, 0);
 570         }
 571 map_error:
 572         if (net_ratelimit())
 573                 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
 574         dev_kfree_skb(skb);
 575 out:
 576         return err;
 577 }
 578
 579 static irqreturn_t greth_interrupt(int irq, void *dev_id)
 580 {
 581         struct net_device *dev = dev_id;
 582         struct greth_private *greth;
 583         u32 status, ctrl;
 584         irqreturn_t retval = IRQ_NONE;
 585
 586         greth = netdev_priv(dev);
 587
 588         spin_lock(&greth->devlock);
 589
 590         /* Get the interrupt events that caused us to be here. */
 591         status = GRETH_REGLOAD(greth->regs->status);
 592
 593         /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
 594          * set regardless of whether IRQ is enabled or not. Especially
 595          * important when shared IRQ.
 596          */
 597         ctrl = GRETH_REGLOAD(greth->regs->control);
 598
 599         /* Handle rx and tx interrupts through poll */
 600         if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
 601             ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
 602                 retval = IRQ_HANDLED;
 603
 604                 /* Disable interrupts and schedule poll() */
 605                 greth_disable_irqs(greth);
 606                 napi_schedule(&greth->napi);
 607         }
 608
 609         mmiowb();
 610         spin_unlock(&greth->devlock);
 611
 612         return retval;
 613 }
 614
 615 static void greth_clean_tx(struct net_device *dev)
 616 {
 617         struct greth_private *greth;
 618         struct greth_bd *bdp;
 619         u32 stat;
 620
 621         greth = netdev_priv(dev);
 622
 623         while (1) {
 624                 bdp = greth->tx_bd_base + greth->tx_last;
 625                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
 626                 mb();
 627                 stat = greth_read_bd(&bdp->stat);
 628
 629                 if (unlikely(stat & GRETH_BD_EN))
 630                         break;
 631
 632                 if (greth->tx_free == GRETH_TXBD_NUM)
 633                         break;
 634
 635                 /* Check status for errors */
 636                 if (unlikely(stat & GRETH_TXBD_STATUS)) {
 637                         dev->stats.tx_errors++;
 638                         if (stat & GRETH_TXBD_ERR_AL)
 639                                 dev->stats.tx_aborted_errors++;
 640                         if (stat & GRETH_TXBD_ERR_UE)
 641                                 dev->stats.tx_fifo_errors++;
 642                 }
 643                 dev->stats.tx_packets++;
 644                 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
 699                 bdp = greth->tx_bd_base + greth->tx_last;
 700
 701                 greth->tx_last = NEXT_TX(greth->tx_last);
 702
 703                 dma_unmap_single(greth->dev,
 704                                  greth_read_bd(&bdp->addr),
 705                                  skb_headlen(skb),
 706                                  DMA_TO_DEVICE);
 707
 708                 for (i = 0; i < nr_frags; i++) {
 709                         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 710                         bdp = greth->tx_bd_base + greth->tx_last;
 711
 712                         dma_unmap_page(greth->dev,
 713                                        greth_read_bd(&bdp->addr),
 714                                        frag->size,
 715                                        DMA_TO_DEVICE);
 716
 717                         greth->tx_last = NEXT_TX(greth->tx_last);
 718                 }
 719                 greth->tx_free += nr_frags+1;
 720                 dev_kfree_skb(skb);
 721         }
 722
 723         if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
 724                 netif_wake_queue(dev);
 725 }
 726
 727 static int greth_rx(struct net_device *dev, int limit)
 728 {
 729         struct greth_private *greth;
 730         struct greth_bd *bdp;
 731         struct sk_buff *skb;
 732         int pkt_len;
 733         int bad, count;
 734         u32 status, dma_addr;
 735         unsigned long flags;
 736
 737         greth = netdev_priv(dev);
 738
 739         for (count = 0; count < limit; ++count) {
 740
 741                 bdp = greth->rx_bd_base + greth->rx_cur;
 742                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 743                 mb();
 744                 status = greth_read_bd(&bdp->stat);
 745
 746                 if (unlikely(status & GRETH_BD_EN)) {
 747                         break;
 748                 }
 749
 750                 dma_addr = greth_read_bd(&bdp->addr);
 751                 bad = 0;
 752
 753                 /* Check status for errors. */
 754                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 755                         if (status & GRETH_RXBD_ERR_FT) {
 756                                 dev->stats.rx_length_errors++;
 757                                 bad = 1;
 758                         }
 759                         if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
 760                                 dev->stats.rx_frame_errors++;
 761                                 bad = 1;
 762                         }
 763                         if (status & GRETH_RXBD_ERR_CRC) {
 764                                 dev->stats.rx_crc_errors++;
 765                                 bad = 1;
 766                         }
 767                 }
 768                 if (unlikely(bad)) {
 769                         dev->stats.rx_errors++;
 770
 771                 } else {
 772
 773                         pkt_len = status & GRETH_BD_LEN;
 774
 775                         skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
 776
 777                         if (unlikely(skb == NULL)) {
 778
 779                                 if (net_ratelimit())
 780                                         dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
 781
 782                                 dev->stats.rx_dropped++;
 783
 784                         } else {
 785                                 skb_reserve(skb, NET_IP_ALIGN);
 786                                 skb->dev = dev;
 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_packets++;
 800                                 netif_receive_skb(skb);
 801                         }
 802                 }
 803
 804                 status = GRETH_BD_EN | GRETH_BD_IE;
 805                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 806                         status |= GRETH_BD_WR;
 807                 }
 808
 809                 wmb();
 810                 greth_write_bd(&bdp->stat, status);
 811
 812                 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
 813
 814                 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
 815                 greth_enable_rx(greth);
 816                 spin_unlock_irqrestore(&greth->devlock, flags);
 817
 818                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 819         }
 820
 821         return count;
 822 }
 823
 824 static inline int hw_checksummed(u32 status)
 825 {
 826
 827         if (status & GRETH_RXBD_IP_FRAG)
 828                 return 0;
 829
 830         if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
 831                 return 0;
 832
 833         if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
 834                 return 0;
 835
 836         if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
 837                 return 0;
 838
 839         return 1;
 840 }
 841
 842 static int greth_rx_gbit(struct net_device *dev, int limit)
 843 {
 844         struct greth_private *greth;
 845         struct greth_bd *bdp;
 846         struct sk_buff *skb, *newskb;
 847         int pkt_len;
 848         int bad, count = 0;
 849         u32 status, dma_addr;
 850         unsigned long flags;
 851
 852         greth = netdev_priv(dev);
 853
 854         for (count = 0; count < limit; ++count) {
 855
 856                 bdp = greth->rx_bd_base + greth->rx_cur;
 857                 skb = greth->rx_skbuff[greth->rx_cur];
 858                 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
 859                 mb();
 860                 status = greth_read_bd(&bdp->stat);
 861                 bad = 0;
 862
 863                 if (status & GRETH_BD_EN)
 864                         break;
 865
 866                 /* Check status for errors. */
 867                 if (unlikely(status & GRETH_RXBD_STATUS)) {
 868
 869                         if (status & GRETH_RXBD_ERR_FT) {
 870                                 dev->stats.rx_length_errors++;
 871                                 bad = 1;
 872                         } else if (status &
 873                                    (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
 874                                 dev->stats.rx_frame_errors++;
 875                                 bad = 1;
 876                         } else if (status & GRETH_RXBD_ERR_CRC) {
 877                                 dev->stats.rx_crc_errors++;
 878                                 bad = 1;
 879                         }
 880                 }
 881
 882                 /* Allocate new skb to replace current, not needed if the
 883                  * current skb can be reused */
 884                 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
 885                         skb_reserve(newskb, NET_IP_ALIGN);
 886
 887                         dma_addr = dma_map_single(greth->dev,
 888                                                       newskb->data,
 889                                                       MAX_FRAME_SIZE + NET_IP_ALIGN,
 890                                                       DMA_FROM_DEVICE);
 891
 892                         if (!dma_mapping_error(greth->dev, dma_addr)) {
 893                                 /* Process the incoming frame. */
 894                                 pkt_len = status & GRETH_BD_LEN;
 895
 896                                 dma_unmap_single(greth->dev,
 897                                                  greth_read_bd(&bdp->addr),
 898                                                  MAX_FRAME_SIZE + NET_IP_ALIGN,
 899                                                  DMA_FROM_DEVICE);
 900
 901                                 if (netif_msg_pktdata(greth))
 902                                         greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
 903
 904                                 skb_put(skb, pkt_len);
 905
 906                                 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
 907                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 908                                 else
 909                                         skb_checksum_none_assert(skb);
 910
 911                                 skb->protocol = eth_type_trans(skb, dev);
 912                                 dev->stats.rx_packets++;
 913                                 netif_receive_skb(skb);
 914
 915                                 greth->rx_skbuff[greth->rx_cur] = newskb;
 916                                 greth_write_bd(&bdp->addr, dma_addr);
 917                         } else {
 918                                 if (net_ratelimit())
 919                                         dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
 920                                 dev_kfree_skb(newskb);
 921                                 /* reusing current skb, so it is a drop */
 922                                 dev->stats.rx_dropped++;
 923                         }
 924                 } else if (bad) {
 925                         /* Bad Frame transfer, the skb is reused */
 926                         dev->stats.rx_dropped++;
 927                 } else {
 928                         /* Failed Allocating a new skb. This is rather stupid
 929                          * but the current "filled" skb is reused, as if
 930                          * transfer failure. One could argue that RX descriptor
 931                          * table handling should be divided into cleaning and
 932                          * filling as the TX part of the driver
 933                          */
 934                         if (net_ratelimit())
 935                                 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
 936                         /* reusing current skb, so it is a drop */
 937                         dev->stats.rx_dropped++;
 938                 }
 939
 940                 status = GRETH_BD_EN | GRETH_BD_IE;
 941                 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
 942                         status |= GRETH_BD_WR;
 943                 }
 944
 945                 wmb();
 946                 greth_write_bd(&bdp->stat, status);
 947                 spin_lock_irqsave(&greth->devlock, flags);
 948                 greth_enable_rx(greth);
 949                 spin_unlock_irqrestore(&greth->devlock, flags);
 950                 greth->rx_cur = NEXT_RX(greth->rx_cur);
 951         }
 952
 953         return count;
 954
 955 }
 956
 957 static int greth_poll(struct napi_struct *napi, int budget)
 958 {
 959         struct greth_private *greth;
 960         int work_done = 0;
 961         unsigned long flags;
 962         u32 mask, ctrl;
 963         greth = container_of(napi, struct greth_private, napi);
 964
 965 restart_txrx_poll:
 966         if (netif_queue_stopped(greth->netdev)) {
 967                 if (greth->gbit_mac)
 968                         greth_clean_tx_gbit(greth->netdev);
 969                 else
 970                         greth_clean_tx(greth->netdev);
 971         }
 972
 973         if (greth->gbit_mac) {
 974                 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
 975         } else {
 976                 work_done += greth_rx(greth->netdev, budget - work_done);
 977         }
 978
 979         if (work_done < budget) {
 980
 981                 spin_lock_irqsave(&greth->devlock, flags);
 982
 983                 ctrl = GRETH_REGLOAD(greth->regs->control);
 984                 if (netif_queue_stopped(greth->netdev)) {
 985                         GRETH_REGSAVE(greth->regs->control,
 986                                         ctrl | GRETH_TXI | GRETH_RXI);
 987                         mask = GRETH_INT_RX | GRETH_INT_RE |
 988                                GRETH_INT_TX | GRETH_INT_TE;
 989                 } else {
 990                         GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
 991                         mask = GRETH_INT_RX | GRETH_INT_RE;
 992                 }
 993
 994                 if (GRETH_REGLOAD(greth->regs->status) & mask) {
 995                         GRETH_REGSAVE(greth->regs->control, ctrl);
 996                         spin_unlock_irqrestore(&greth->devlock, flags);
 997                         goto restart_txrx_poll;
 998                 } else {
 999                         __napi_complete(napi);
1000                         spin_unlock_irqrestore(&greth->devlock, flags);
1001                 }
1002         }
1003
1004         return work_done;
1005 }
1006
1007 static int greth_set_mac_add(struct net_device *dev, void *p)
1008 {
1009         struct sockaddr *addr = p;
1010         struct greth_private *greth;
1011         struct greth_regs *regs;
1012
1013         greth = netdev_priv(dev);
1014         regs = (struct greth_regs *) greth->regs;
1015
1016         if (!is_valid_ether_addr(addr->sa_data))
1017                 return -EINVAL;
1018
1019         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1020
1021         GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
1022         GRETH_REGSAVE(regs->esa_lsb,
1023                       addr->sa_data[2] << 24 | addr->
1024                       sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
1025         return 0;
1026 }
1027
1028 static u32 greth_hash_get_index(__u8 *addr)
1029 {
1030         return (ether_crc(6, addr)) & 0x3F;
1031 }
1032
1033 static void greth_set_hash_filter(struct net_device *dev)
1034 {
1035         struct netdev_hw_addr *ha;
1036         struct greth_private *greth = netdev_priv(dev);
1037         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1038         u32 mc_filter[2];
1039         unsigned int bitnr;
1040
1041         mc_filter[0] = mc_filter[1] = 0;
1042
1043         netdev_for_each_mc_addr(ha, dev) {
1044                 bitnr = greth_hash_get_index(ha->addr);
1045                 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1046         }
1047
1048         GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1049         GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1050 }
1051
1052 static void greth_set_multicast_list(struct net_device *dev)
1053 {
1054         int cfg;
1055         struct greth_private *greth = netdev_priv(dev);
1056         struct greth_regs *regs = (struct greth_regs *) greth->regs;
1057
1058         cfg = GRETH_REGLOAD(regs->control);
1059         if (dev->flags & IFF_PROMISC)
1060                 cfg |= GRETH_CTRL_PR;
1061         else
1062                 cfg &= ~GRETH_CTRL_PR;
1063
1064         if (greth->multicast) {
1065                 if (dev->flags & IFF_ALLMULTI) {
1066                         GRETH_REGSAVE(regs->hash_msb, -1);
1067                         GRETH_REGSAVE(regs->hash_lsb, -1);
1068                         cfg |= GRETH_CTRL_MCEN;
1069                         GRETH_REGSAVE(regs->control, cfg);
1070                         return;
1071                 }
1072
1073                 if (netdev_mc_empty(dev)) {
1074                         cfg &= ~GRETH_CTRL_MCEN;
1075                         GRETH_REGSAVE(regs->control, cfg);
1076                         return;
1077                 }
1078
1079                 /* Setup multicast filter */
1080                 greth_set_hash_filter(dev);
1081                 cfg |= GRETH_CTRL_MCEN;
1082         }
1083         GRETH_REGSAVE(regs->control, cfg);
1084 }
1085
1086 static u32 greth_get_msglevel(struct net_device *dev)
1087 {
1088         struct greth_private *greth = netdev_priv(dev);
1089         return greth->msg_enable;
1090 }
1091
1092 static void greth_set_msglevel(struct net_device *dev, u32 value)
1093 {
1094         struct greth_private *greth = netdev_priv(dev);
1095         greth->msg_enable = value;
1096 }
1097 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1098 {
1099         struct greth_private *greth = netdev_priv(dev);
1100         struct phy_device *phy = greth->phy;
1101
1102         if (!phy)
1103                 return -ENODEV;
1104
1105         return phy_ethtool_gset(phy, cmd);
1106 }
1107
1108 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1109 {
1110         struct greth_private *greth = netdev_priv(dev);
1111         struct phy_device *phy = greth->phy;
1112
1113         if (!phy)
1114                 return -ENODEV;
1115
1116         return phy_ethtool_sset(phy, cmd);
1117 }
1118
1119 static int greth_get_regs_len(struct net_device *dev)
1120 {
1121         return sizeof(struct greth_regs);
1122 }
1123
1124 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1125 {
1126         struct greth_private *greth = netdev_priv(dev);
1127
1128         strncpy(info->driver, dev_driver_string(greth->dev), 32);
1129         strncpy(info->version, "revision: 1.0", 32);
1130         strncpy(info->bus_info, greth->dev->bus->name, 32);
1131         strncpy(info->fw_version, "N/A", 32);
1132         info->eedump_len = 0;
1133         info->regdump_len = sizeof(struct greth_regs);
1134 }
1135
1136 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1137 {
1138         int i;
1139         struct greth_private *greth = netdev_priv(dev);
1140         u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1141         u32 *buff = p;
1142
1143         for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1144                 buff[i] = greth_read_bd(&greth_regs[i]);
1145 }
1146
1147 static const struct ethtool_ops greth_ethtool_ops = {
1148         .get_msglevel           = greth_get_msglevel,
1149         .set_msglevel           = greth_set_msglevel,
1150         .get_settings           = greth_get_settings,
1151         .set_settings           = greth_set_settings,
1152         .get_drvinfo            = greth_get_drvinfo,
1153         .get_regs_len           = greth_get_regs_len,
1154         .get_regs               = greth_get_regs,
1155         .get_link               = ethtool_op_get_link,
1156 };
1157
1158 static struct net_device_ops greth_netdev_ops = {
1159         .ndo_open               = greth_open,
1160         .ndo_stop               = greth_close,
1161         .ndo_start_xmit         = greth_start_xmit,
1162         .ndo_set_mac_address    = greth_set_mac_add,
1163         .ndo_validate_addr      = eth_validate_addr,
1164 };
1165
1166 static inline int wait_for_mdio(struct greth_private *greth)
1167 {
1168         unsigned long timeout = jiffies + 4*HZ/100;
1169         while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1170                 if (time_after(jiffies, timeout))
1171                         return 0;
1172         }
1173         return 1;
1174 }
1175
1176 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1177 {
1178         struct greth_private *greth = bus->priv;
1179         int data;
1180
1181         if (!wait_for_mdio(greth))
1182                 return -EBUSY;
1183
1184         GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1185
1186         if (!wait_for_mdio(greth))
1187                 return -EBUSY;
1188
1189         if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1190                 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1191                 return data;
1192
1193         } else {
1194                 return -1;
1195         }
1196 }
1197
1198 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1199 {
1200         struct greth_private *greth = bus->priv;
1201
1202         if (!wait_for_mdio(greth))
1203                 return -EBUSY;
1204
1205         GRETH_REGSAVE(greth->regs->mdio,
1206                       ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1207
1208         if (!wait_for_mdio(greth))
1209                 return -EBUSY;
1210
1211         return 0;
1212 }
1213
1214 static int greth_mdio_reset(struct mii_bus *bus)
1215 {
1216         return 0;
1217 }
1218
1219 static void greth_link_change(struct net_device *dev)
1220 {
1221         struct greth_private *greth = netdev_priv(dev);
1222         struct phy_device *phydev = greth->phy;
1223         unsigned long flags;
1224         int status_change = 0;
1225         u32 ctrl;
1226
1227         spin_lock_irqsave(&greth->devlock, flags);
1228
1229         if (phydev->link) {
1230
1231                 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1232                         ctrl = GRETH_REGLOAD(greth->regs->control) &
1233                                ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1234
1235                         if (phydev->duplex)
1236                                 ctrl |= GRETH_CTRL_FD;
1237
1238                         if (phydev->speed == SPEED_100)
1239                                 ctrl |= GRETH_CTRL_SP;
1240                         else if (phydev->speed == SPEED_1000)
1241                                 ctrl |= GRETH_CTRL_GB;
1242
1243                         GRETH_REGSAVE(greth->regs->control, ctrl);
1244                         greth->speed = phydev->speed;
1245                         greth->duplex = phydev->duplex;
1246                         status_change = 1;
1247                 }
1248         }
1249
1250         if (phydev->link != greth->link) {
1251                 if (!phydev->link) {
1252                         greth->speed = 0;
1253                         greth->duplex = -1;
1254                 }
1255                 greth->link = phydev->link;
1256
1257                 status_change = 1;
1258         }
1259
1260         spin_unlock_irqrestore(&greth->devlock, flags);
1261
1262         if (status_change) {
1263                 if (phydev->link)
1264                         pr_debug("%s: link up (%d/%s)\n",
1265                                 dev->name, phydev->speed,
1266                                 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1267                 else
1268                         pr_debug("%s: link down\n", dev->name);
1269         }
1270 }
1271
1272 static int greth_mdio_probe(struct net_device *dev)
1273 {
1274         struct greth_private *greth = netdev_priv(dev);
1275         struct phy_device *phy = NULL;
1276         int ret;
1277
1278         /* Find the first PHY */
1279         phy = phy_find_first(greth->mdio);
1280
1281         if (!phy) {
1282                 if (netif_msg_probe(greth))
1283                         dev_err(&dev->dev, "no PHY found\n");
1284                 return -ENXIO;
1285         }
1286
1287         ret = phy_connect_direct(dev, phy, &greth_link_change,
1288                         0, greth->gbit_mac ?
1289                         PHY_INTERFACE_MODE_GMII :
1290                         PHY_INTERFACE_MODE_MII);
1291         if (ret) {
1292                 if (netif_msg_ifup(greth))
1293                         dev_err(&dev->dev, "could not attach to PHY\n");
1294                 return ret;
1295         }
1296
1297         if (greth->gbit_mac)
1298                 phy->supported &= PHY_GBIT_FEATURES;
1299         else
1300                 phy->supported &= PHY_BASIC_FEATURES;
1301
1302         phy->advertising = phy->supported;
1303
1304         greth->link = 0;
1305         greth->speed = 0;
1306         greth->duplex = -1;
1307         greth->phy = phy;
1308
1309         return 0;
1310 }
1311
1312 static inline int phy_aneg_done(struct phy_device *phydev)
1313 {
1314         int retval;
1315
1316         retval = phy_read(phydev, MII_BMSR);
1317
1318         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1319 }
1320
1321 static int greth_mdio_init(struct greth_private *greth)
1322 {
1323         int ret, phy;
1324         unsigned long timeout;
1325
1326         greth->mdio = mdiobus_alloc();
1327         if (!greth->mdio) {
1328                 return -ENOMEM;
1329         }
1330
1331         greth->mdio->name = "greth-mdio";
1332         snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1333         greth->mdio->read = greth_mdio_read;
1334         greth->mdio->write = greth_mdio_write;
1335         greth->mdio->reset = greth_mdio_reset;
1336         greth->mdio->priv = greth;
1337
1338         greth->mdio->irq = greth->mdio_irqs;
1339
1340         for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1341                 greth->mdio->irq[phy] = PHY_POLL;
1342
1343         ret = mdiobus_register(greth->mdio);
1344         if (ret) {
1345                 goto error;
1346         }
1347
1348         ret = greth_mdio_probe(greth->netdev);
1349         if (ret) {
1350                 if (netif_msg_probe(greth))
1351                         dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1352                 goto unreg_mdio;
1353         }
1354
1355         phy_start(greth->phy);
1356
1357         /* If Ethernet debug link is used make autoneg happen right away */
1358         if (greth->edcl && greth_edcl == 1) {
1359                 phy_start_aneg(greth->phy);
1360                 timeout = jiffies + 6*HZ;
1361                 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1362                 }
1363                 genphy_read_status(greth->phy);
1364                 greth_link_change(greth->netdev);
1365         }
1366
1367         return 0;
1368
1369 unreg_mdio:
1370         mdiobus_unregister(greth->mdio);
1371 error:
1372         mdiobus_free(greth->mdio);
1373         return ret;
1374 }
1375
1376 /* Initialize the GRETH MAC */
1377 static int __devinit greth_of_probe(struct platform_device *ofdev)
1378 {
1379         struct net_device *dev;
1380         struct greth_private *greth;
1381         struct greth_regs *regs;
1382
1383         int i;
1384         int err;
1385         int tmp;
1386         unsigned long timeout;
1387
1388         dev = alloc_etherdev(sizeof(struct greth_private));
1389
1390         if (dev == NULL)
1391                 return -ENOMEM;
1392
1393         greth = netdev_priv(dev);
1394         greth->netdev = dev;
1395         greth->dev = &ofdev->dev;
1396
1397         if (greth_debug > 0)
1398                 greth->msg_enable = greth_debug;
1399         else
1400                 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1401
1402         spin_lock_init(&greth->devlock);
1403
1404         greth->regs = of_ioremap(&ofdev->resource[0], 0,
1405                                  resource_size(&ofdev->resource[0]),
1406                                  "grlib-greth regs");
1407
1408         if (greth->regs == NULL) {
1409                 if (netif_msg_probe(greth))
1410                         dev_err(greth->dev, "ioremap failure.\n");
1411                 err = -EIO;
1412                 goto error1;
1413         }
1414
1415         regs = (struct greth_regs *) greth->regs;
1416         greth->irq = ofdev->archdata.irqs[0];
1417
1418         dev_set_drvdata(greth->dev, dev);
1419         SET_NETDEV_DEV(dev, greth->dev);
1420
1421         if (netif_msg_probe(greth))
1422                 dev_dbg(greth->dev, "reseting controller.\n");
1423
1424         /* Reset the controller. */
1425         GRETH_REGSAVE(regs->control, GRETH_RESET);
1426
1427         /* Wait for MAC to reset itself */
1428         timeout = jiffies + HZ/100;
1429         while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1430                 if (time_after(jiffies, timeout)) {
1431                         err = -EIO;
1432                         if (netif_msg_probe(greth))
1433                                 dev_err(greth->dev, "timeout when waiting for reset.\n");
1434                         goto error2;
1435                 }
1436         }
1437
1438         /* Get default PHY address  */
1439         greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1440
1441         /* Check if we have GBIT capable MAC */
1442         tmp = GRETH_REGLOAD(regs->control);
1443         greth->gbit_mac = (tmp >> 27) & 1;
1444
1445         /* Check for multicast capability */
1446         greth->multicast = (tmp >> 25) & 1;
1447
1448         greth->edcl = (tmp >> 31) & 1;
1449
1450         /* If we have EDCL we disable the EDCL speed-duplex FSM so
1451          * it doesn't interfere with the software */
1452         if (greth->edcl != 0)
1453                 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1454
1455         /* Check if MAC can handle MDIO interrupts */
1456         greth->mdio_int_en = (tmp >> 26) & 1;
1457
1458         err = greth_mdio_init(greth);
1459         if (err) {
1460                 if (netif_msg_probe(greth))
1461                         dev_err(greth->dev, "failed to register MDIO bus\n");
1462                 goto error2;
1463         }
1464
1465         /* Allocate TX descriptor ring in coherent memory */
1466         greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1467                                                                    1024,
1468                                                                    &greth->tx_bd_base_phys,
1469                                                                    GFP_KERNEL);
1470
1471         if (!greth->tx_bd_base) {
1472                 if (netif_msg_probe(greth))
1473                         dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1474                 err = -ENOMEM;
1475                 goto error3;
1476         }
1477
1478         memset(greth->tx_bd_base, 0, 1024);
1479
1480         /* Allocate RX descriptor ring in coherent memory */
1481         greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1482                                                                    1024,
1483                                                                    &greth->rx_bd_base_phys,
1484                                                                    GFP_KERNEL);
1485
1486         if (!greth->rx_bd_base) {
1487                 if (netif_msg_probe(greth))
1488                         dev_err(greth->dev, "could not allocate descriptor memory.\n");
1489                 err = -ENOMEM;
1490                 goto error4;
1491         }
1492
1493         memset(greth->rx_bd_base, 0, 1024);
1494
1495         /* Get MAC address from: module param, OF property or ID prom */
1496         for (i = 0; i < 6; i++) {
1497                 if (macaddr[i] != 0)
1498                         break;
1499         }
1500         if (i == 6) {
1501                 const unsigned char *addr;
1502                 int len;
1503                 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1504                                         &len);
1505                 if (addr != NULL && len == 6) {
1506                         for (i = 0; i < 6; i++)
1507                                 macaddr[i] = (unsigned int) addr[i];
1508                 } else {
1509 #ifdef CONFIG_SPARC
1510                         for (i = 0; i < 6; i++)
1511                                 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1512 #endif
1513                 }
1514         }
1515
1516         for (i = 0; i < 6; i++)
1517                 dev->dev_addr[i] = macaddr[i];
1518
1519         macaddr[5]++;
1520
1521         if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1522                 if (netif_msg_probe(greth))
1523                         dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1524                 err = -EINVAL;
1525                 goto error5;
1526         }
1527
1528         GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1529         GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1530                       dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1531
1532         /* Clear all pending interrupts except PHY irq */
1533         GRETH_REGSAVE(regs->status, 0xFF);
1534
1535         if (greth->gbit_mac) {
1536                 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1537                         NETIF_F_RXCSUM;
1538                 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1539                 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1540         }
1541
1542         if (greth->multicast) {
1543                 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1544                 dev->flags |= IFF_MULTICAST;
1545         } else {
1546                 dev->flags &= ~IFF_MULTICAST;
1547         }
1548
1549         dev->netdev_ops = &greth_netdev_ops;
1550         dev->ethtool_ops = &greth_ethtool_ops;
1551
1552         err = register_netdev(dev);
1553         if (err) {
1554                 if (netif_msg_probe(greth))
1555                         dev_err(greth->dev, "netdevice registration failed.\n");
1556                 goto error5;
1557         }
1558
1559         /* setup NAPI */
1560         netif_napi_add(dev, &greth->napi, greth_poll, 64);
1561
1562         return 0;
1563
1564 error5:
1565         dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1566 error4:
1567         dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1568 error3:
1569         mdiobus_unregister(greth->mdio);
1570 error2:
1571         of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1572 error1:
1573         free_netdev(dev);
1574         return err;
1575 }
1576
1577 static int __devexit greth_of_remove(struct platform_device *of_dev)
1578 {
1579         struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1580         struct greth_private *greth = netdev_priv(ndev);
1581
1582         /* Free descriptor areas */
1583         dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1584
1585         dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1586
1587         dev_set_drvdata(&of_dev->dev, NULL);
1588
1589         if (greth->phy)
1590                 phy_stop(greth->phy);
1591         mdiobus_unregister(greth->mdio);
1592
1593         unregister_netdev(ndev);
1594         free_netdev(ndev);
1595
1596         of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1597
1598         return 0;
1599 }
1600
1601 static struct of_device_id greth_of_match[] = {
1602         {
1603          .name = "GAISLER_ETHMAC",
1604          },
1605         {
1606          .name = "01_01d",
1607          },
1608         {},
1609 };
1610
1611 MODULE_DEVICE_TABLE(of, greth_of_match);
1612
1613 static struct platform_driver greth_of_driver = {
1614         .driver = {
1615                 .name = "grlib-greth",
1616                 .owner = THIS_MODULE,
1617                 .of_match_table = greth_of_match,
1618         },
1619         .probe = greth_of_probe,
1620         .remove = __devexit_p(greth_of_remove),
1621 };
1622
1623 static int __init greth_init(void)
1624 {
1625         return platform_driver_register(&greth_of_driver);
1626 }
1627
1628 static void __exit greth_cleanup(void)
1629 {
1630         platform_driver_unregister(&greth_of_driver);
1631 }
1632
1633 module_init(greth_init);
1634 module_exit(greth_cleanup);
1635
1636 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1637 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1638 MODULE_LICENSE("GPL");