target/linux/ubicom32/files/drivers/net/ubi32-eth.c

   1 /*
   2  * drivers/net/ubi32-eth.c
   3  *   Ubicom32 ethernet TIO interface driver.
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  *
   7  * This file is part of the Ubicom32 Linux Kernel Port.
   8  *
   9  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  10  * it and/or modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation, either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  16  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  * the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with the Ubicom32 Linux Kernel Port.  If not,
  21  * see <http://www.gnu.org/licenses/>.
  22  *
  23  * Ubicom32 implementation derived from (with many thanks):
  24  *   arch/m68knommu
  25  *   arch/blackfin
  26  *   arch/parisc
  27  */
  28 /*
  29  * ubi32_eth.c
  30  * Ethernet driver for Ip5k/Ip7K
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/init.h>
  35 #include <linux/moduleparam.h>
  36
  37 #include <linux/sched.h>
  38 #include <linux/kernel.h>
  39 #include <linux/errno.h>
  40 #include <linux/types.h>
  41 #include <linux/interrupt.h>
  42
  43 #include <linux/in.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/etherdevice.h>
  46 #include <linux/mii.h>
  47 #include <linux/if_vlan.h>
  48 #include <linux/ip.h>
  49 #include <linux/tcp.h>
  50 #include <linux/skbuff.h>
  51 #include <asm/checksum.h>
  52 #include <asm/ip5000.h>
  53 #include <asm/devtree.h>
  54 #include <asm/system.h>
  55
  56 #define UBICOM32_USE_NAPI       /* define this to use NAPI instead of tasklet */
  57 //#define UBICOM32_USE_POLLING  /* define this to use polling instead of interrupt */
  58 #include "ubi32-eth.h"
  59
  60 /*
  61  * TODO:
  62  * mac address from flash
  63  * multicast filter
  64  * ethtool support
  65  * sysfs support
  66  * skb->nrfrag support
  67  * ioctl
  68  * monitor phy status
  69  */
  70
  71 extern int ubi32_ocm_skbuf_max, ubi32_ocm_skbuf, ubi32_ddr_skbuf;
  72 static const char *eth_if_name[UBI32_ETH_NUM_OF_DEVICES] =
  73         {"eth_lan", "eth_wan"};
  74 static struct net_device *ubi32_eth_devices[UBI32_ETH_NUM_OF_DEVICES] =
  75         {NULL, NULL};
  76 static u8_t mac_addr[UBI32_ETH_NUM_OF_DEVICES][ETH_ALEN] = {
  77         {0x00, 0x03, 0x64, 'l', 'a', 'n'},
  78         {0x00, 0x03, 0x64, 'w', 'a', 'n'}};
  79
  80 #if (defined(CONFIG_ZONE_DMA) && defined(CONFIG_UBICOM32_OCM_FOR_SKB))
  81 static inline struct sk_buff *ubi32_alloc_skb_ocm(struct net_device *dev, unsigned int length)
  82 {
  83         return __dev_alloc_skb(length, GFP_ATOMIC | __GFP_NOWARN | __GFP_NORETRY | GFP_DMA);
  84 }
  85 #endif
  86
  87 static inline struct sk_buff *ubi32_alloc_skb(struct net_device *dev, unsigned int length)
  88 {
  89         return __dev_alloc_skb(length, GFP_ATOMIC | __GFP_NOWARN);
  90 }
  91
  92 static void ubi32_eth_vp_rxtx_enable(struct net_device *dev)
  93 {
  94         struct ubi32_eth_private *priv = netdev_priv(dev);
  95         priv->regs->command = UBI32_ETH_VP_CMD_RX_ENABLE | UBI32_ETH_VP_CMD_TX_ENABLE;
  96         priv->regs->int_mask = (UBI32_ETH_VP_INT_RX | UBI32_ETH_VP_INT_TX);
  97         ubicom32_set_interrupt(priv->vp_int_bit);
  98 }
  99
 100 static void ubi32_eth_vp_rxtx_stop(struct net_device *dev)
 101 {
 102         struct ubi32_eth_private *priv = netdev_priv(dev);
 103         priv->regs->command = 0;
 104         priv->regs->int_mask = 0;
 105         ubicom32_set_interrupt(priv->vp_int_bit);
 106
 107         /* Wait for graceful shutdown */
 108         while (priv->regs->status & (UBI32_ETH_VP_STATUS_RX_STATE | UBI32_ETH_VP_STATUS_TX_STATE));
 109 }
 110
 111 /*
 112  * ubi32_eth_tx_done()
 113  */
 114 static int ubi32_eth_tx_done(struct net_device *dev)
 115 {
 116         struct ubi32_eth_private *priv;
 117         struct sk_buff *skb;
 118         volatile void *pdata;
 119         struct ubi32_eth_dma_desc *desc;
 120         u32_t   count = 0;
 121
 122         priv = netdev_priv(dev);
 123
 124         priv->regs->int_status &= ~UBI32_ETH_VP_INT_TX;
 125         while (priv->tx_tail != priv->regs->tx_out) {
 126                 pdata = priv->regs->tx_dma_ring[priv->tx_tail];
 127                 BUG_ON(pdata == NULL);
 128
 129                 skb = container_of((void *)pdata, struct sk_buff, cb);
 130                 desc = (struct ubi32_eth_dma_desc *)pdata;
 131                 if (unlikely(!(desc->status & UBI32_ETH_VP_TX_OK))) {
 132                         dev->stats.tx_errors++;
 133                 } else {
 134                         dev->stats.tx_packets++;
 135                         dev->stats.tx_bytes += skb->len;
 136                 }
 137                 dev_kfree_skb_any(skb);
 138                 priv->regs->tx_dma_ring[priv->tx_tail] = NULL;
 139                 priv->tx_tail = (priv->tx_tail + 1) & TX_DMA_RING_MASK;
 140                 count++;
 141         }
 142
 143         if (unlikely(priv->regs->status & UBI32_ETH_VP_STATUS_TX_Q_FULL)) {
 144                 spin_lock(&priv->lock);
 145                 if (priv->regs->status & UBI32_ETH_VP_STATUS_TX_Q_FULL) {
 146                         priv->regs->status &= ~UBI32_ETH_VP_STATUS_TX_Q_FULL;
 147                         netif_wake_queue(dev);
 148                 }
 149                 spin_unlock(&priv->lock);
 150         }
 151         return count;
 152 }
 153
 154 /*
 155  * ubi32_eth_receive()
 156  *      To avoid locking overhead, this is called only
 157  *      by tasklet when not using NAPI, or
 158  *      by NAPI poll when using NAPI.
 159  *      return number of frames processed
 160  */
 161 static int ubi32_eth_receive(struct net_device *dev, int quota)
 162 {
 163         struct ubi32_eth_private *priv = netdev_priv(dev);
 164         unsigned short rx_in = priv->regs->rx_in;
 165         struct sk_buff *skb;
 166         struct ubi32_eth_dma_desc *desc = NULL;
 167         volatile void *pdata;
 168
 169         int extra_reserve_adj;
 170         int extra_alloc = UBI32_ETH_RESERVE_SPACE + UBI32_ETH_TRASHED_MEMORY;
 171         int replenish_cnt, count = 0;
 172         int replenish_max = RX_DMA_MAX_QUEUE_SIZE;
 173 #if (defined(CONFIG_ZONE_DMA) && defined(CONFIG_UBICOM32_OCM_FOR_SKB))
 174         if (likely(dev == ubi32_eth_devices[0]))
 175                 replenish_max = min(ubi32_ocm_skbuf_max, RX_DMA_MAX_QUEUE_SIZE);;
 176 #endif
 177
 178         if (unlikely(rx_in == priv->regs->rx_out))
 179                 priv->vp_stats.rx_q_full_cnt++;
 180
 181         priv->regs->int_status &= ~UBI32_ETH_VP_INT_RX;
 182         while (priv->rx_tail != priv->regs->rx_out) {
 183                 if (unlikely(count == quota)) {
 184                         /* There is still frame pending to be processed */
 185                         priv->vp_stats.rx_throttle++;
 186                         break;
 187                 }
 188
 189                 pdata = priv->regs->rx_dma_ring[priv->rx_tail];
 190                 BUG_ON(pdata == NULL);
 191
 192                 desc = (struct ubi32_eth_dma_desc *)pdata;
 193                 skb = container_of((void *)pdata, struct sk_buff, cb);
 194                 count++;
 195                 priv->regs->rx_dma_ring[priv->rx_tail] = NULL;
 196                 priv->rx_tail = ((priv->rx_tail + 1) & RX_DMA_RING_MASK);
 197
 198                 /*
 199                  * Check only RX_OK bit here.
 200                  * The rest of status word is used as timestamp
 201                  */
 202                 if (unlikely(!(desc->status & UBI32_ETH_VP_RX_OK))) {
 203                         dev->stats.rx_errors++;
 204                         dev_kfree_skb_any(skb);
 205                         continue;
 206                 }
 207
 208                 skb_put(skb, desc->data_len);
 209                 skb->dev = dev;
 210                 skb->protocol = eth_type_trans(skb, dev);
 211                 skb->ip_summed = CHECKSUM_NONE;
 212                 dev->stats.rx_bytes += skb->len;
 213                 dev->stats.rx_packets++;
 214 #ifndef UBICOM32_USE_NAPI
 215                 netif_rx(skb);
 216 #else
 217                 netif_receive_skb(skb);
 218 #endif
 219         }
 220
 221         /* fill in more descripor for VP*/
 222         replenish_cnt =  replenish_max -
 223                 ((RX_DMA_RING_SIZE + rx_in - priv->rx_tail) & RX_DMA_RING_MASK);
 224         if (replenish_cnt > 0) {
 225 #if (defined(CONFIG_ZONE_DMA) && defined(CONFIG_UBICOM32_OCM_FOR_SKB))
 226                 /*
 227                  * black magic for perforamnce:
 228                  *   Try to allocate skb from OCM only for first Ethernet I/F.
 229                  *   Also limit number of RX buffers to 21 due to limited OCM.
 230                  */
 231                 if (likely(dev == ubi32_eth_devices[0])) {
 232                         do {
 233                                 skb = ubi32_alloc_skb_ocm(dev, RX_BUF_SIZE + extra_alloc);
 234                                 if (!skb) {
 235                                         break;
 236                                 }
 237                                 /* set up dma descriptor */
 238                                 ubi32_ocm_skbuf++;
 239                                 desc = (struct ubi32_eth_dma_desc *)skb->cb;
 240                                 extra_reserve_adj =
 241                                         ((u32)skb->data + UBI32_ETH_RESERVE_SPACE + ETH_HLEN) &
 242                                         (CACHE_LINE_SIZE - 1);
 243                                 skb_reserve(skb, UBI32_ETH_RESERVE_SPACE - extra_reserve_adj);
 244                                 desc->data_pointer = skb->data;
 245                                 desc->buffer_len = RX_BUF_SIZE + UBI32_ETH_TRASHED_MEMORY;
 246                                 desc->data_len = 0;
 247                                 desc->status = 0;
 248                                 priv->regs->rx_dma_ring[rx_in] = desc;
 249                                 rx_in = (rx_in + 1) & RX_DMA_RING_MASK;
 250                         } while (--replenish_cnt > 0);
 251                 }
 252 #endif
 253
 254                 while (replenish_cnt-- > 0) {
 255                         skb = ubi32_alloc_skb(dev, RX_BUF_SIZE + extra_alloc);
 256                         if (!skb) {
 257                                 priv->vp_stats.rx_alloc_err++;
 258                                 break;
 259                         }
 260                         /* set up dma descriptor */
 261                         ubi32_ddr_skbuf++;
 262                         desc = (struct ubi32_eth_dma_desc *)skb->cb;
 263                         extra_reserve_adj =
 264                                 ((u32)skb->data + UBI32_ETH_RESERVE_SPACE + ETH_HLEN) &
 265                                 (CACHE_LINE_SIZE - 1);
 266                         skb_reserve(skb, UBI32_ETH_RESERVE_SPACE - extra_reserve_adj);
 267                         desc->data_pointer = skb->data;
 268                         desc->buffer_len = RX_BUF_SIZE + UBI32_ETH_TRASHED_MEMORY;
 269                         desc->data_len = 0;
 270                         desc->status = 0;
 271                         priv->regs->rx_dma_ring[rx_in] = desc;
 272                         rx_in = (rx_in + 1) & RX_DMA_RING_MASK;
 273                 }
 274
 275                 wmb();
 276                 priv->regs->rx_in = rx_in;
 277                 ubicom32_set_interrupt(priv->vp_int_bit);
 278         }
 279
 280         if (likely(count > 0)) {
 281                 dev->last_rx = jiffies;
 282         }
 283         return count;
 284 }
 285
 286 #ifdef UBICOM32_USE_NAPI
 287 static int ubi32_eth_napi_poll(struct napi_struct *napi, int budget)
 288 {
 289         struct ubi32_eth_private *priv = container_of(napi, struct ubi32_eth_private, napi);
 290         struct net_device *dev = priv->dev;
 291         u32_t count;
 292
 293         if (priv->tx_tail != priv->regs->tx_out) {
 294                 ubi32_eth_tx_done(dev);
 295         }
 296
 297         count = ubi32_eth_receive(dev, budget);
 298
 299         if (count < budget) {
 300                 napi_complete(napi);
 301                 priv->regs->int_mask |= (UBI32_ETH_VP_INT_RX | UBI32_ETH_VP_INT_TX);
 302                 if ((priv->rx_tail != priv->regs->rx_out) || (priv->tx_tail != priv->regs->tx_out)) {
 303                         if (napi_reschedule(napi)) {
 304                                 priv->regs->int_mask = 0;
 305                         }
 306                 }
 307         }
 308         return count;
 309 }
 310
 311 #else
 312 static void ubi32_eth_do_tasklet(unsigned long arg)
 313 {
 314         struct net_device *dev = (struct net_device *)arg;
 315         struct ubi32_eth_private *priv = netdev_priv(dev);
 316
 317         if (priv->tx_tail != priv->regs->tx_out) {
 318                 ubi32_eth_tx_done(dev);
 319         }
 320
 321         /* always call receive to process new RX frame as well as replenish RX buffers */
 322         ubi32_eth_receive(dev, UBI32_RX_BOUND);
 323
 324         priv->regs->int_mask |= (UBI32_ETH_VP_INT_RX | UBI32_ETH_VP_INT_TX);
 325         if ((priv->rx_tail != priv->regs->rx_out) || (priv->tx_tail != priv->regs->tx_out)) {
 326                 priv->regs->int_mask = 0;
 327                 tasklet_schedule(&priv->tsk);
 328         }
 329 }
 330 #endif
 331
 332 #if defined(UBICOM32_USE_POLLING)
 333 static struct timer_list eth_poll_timer;
 334
 335 static void ubi32_eth_poll(unsigned long arg)
 336 {
 337         struct net_device *dev;
 338         struct ubi32_eth_private *priv;
 339         int i;
 340
 341         for (i = 0; i < UBI32_ETH_NUM_OF_DEVICES; i++) {
 342                 dev = ubi32_eth_devices[i];
 343                 if (dev && (dev->flags & IFF_UP)) {
 344                         priv = netdev_priv(dev);
 345 #ifdef UBICOM32_USE_NAPI
 346                         napi_schedule(&priv->napi);
 347 #else
 348                         tasklet_schedule(&priv->tsk);
 349 #endif
 350                 }
 351         }
 352
 353         eth_poll_timer.expires = jiffies + 2;
 354         add_timer(&eth_poll_timer);
 355 }
 356
 357 #else
 358 static irqreturn_t ubi32_eth_interrupt(int irq, void *dev_id)
 359 {
 360         struct ubi32_eth_private *priv;
 361
 362         struct net_device *dev = (struct net_device *)dev_id;
 363         BUG_ON(irq != dev->irq);
 364
 365         priv = netdev_priv(dev);
 366         if (unlikely(!(priv->regs->int_status & priv->regs->int_mask))) {
 367                 return IRQ_NONE;
 368         }
 369
 370         /*
 371          * Disable port interrupt
 372          */
 373 #ifdef UBICOM32_USE_NAPI
 374         if (napi_schedule_prep(&priv->napi)) {
 375                 priv->regs->int_mask = 0;
 376                 __napi_schedule(&priv->napi);
 377         }
 378 #else
 379         priv->regs->int_mask = 0;
 380         tasklet_schedule(&priv->tsk);
 381 #endif
 382         return IRQ_HANDLED;
 383 }
 384 #endif
 385
 386 /*
 387  * ubi32_eth_open
 388  */
 389 static int ubi32_eth_open(struct net_device *dev)
 390 {
 391         struct ubi32_eth_private *priv = netdev_priv(dev);
 392         int err;
 393
 394         printk(KERN_INFO "eth open %s\n",dev->name);
 395 #ifndef UBICOM32_USE_POLLING
 396         /* request_region() */
 397         err = request_irq(dev->irq, ubi32_eth_interrupt, IRQF_DISABLED, dev->name, dev);
 398         if (err) {
 399                 printk(KERN_WARNING "fail to request_irq %d\n",err);
 400                  return -ENODEV;
 401         }
 402 #endif
 403 #ifdef  UBICOM32_USE_NAPI
 404         napi_enable(&priv->napi);
 405 #else
 406         tasklet_init(&priv->tsk, ubi32_eth_do_tasklet, (unsigned long)dev);
 407 #endif
 408
 409         /* call receive to supply RX buffers */
 410         ubi32_eth_receive(dev, RX_DMA_MAX_QUEUE_SIZE);
 411
 412         /* check phy status and call netif_carrier_on */
 413         ubi32_eth_vp_rxtx_enable(dev);
 414         netif_start_queue(dev);
 415         return 0;
 416 }
 417
 418 static int ubi32_eth_close(struct net_device *dev)
 419 {
 420         struct ubi32_eth_private *priv = netdev_priv(dev);
 421         volatile void *pdata;
 422         struct sk_buff *skb;
 423
 424 #ifndef UBICOM32_USE_POLLING
 425         free_irq(dev->irq, dev);
 426 #endif
 427         netif_stop_queue(dev); /* can't transmit any more */
 428 #ifdef UBICOM32_USE_NAPI
 429         napi_disable(&priv->napi);
 430 #else
 431         tasklet_kill(&priv->tsk);
 432 #endif
 433         ubi32_eth_vp_rxtx_stop(dev);
 434
 435         /*
 436          * RX clean up
 437          */
 438         while (priv->rx_tail != priv->regs->rx_in) {
 439                 pdata = priv->regs->rx_dma_ring[priv->rx_tail];
 440                 skb = container_of((void *)pdata, struct sk_buff, cb);
 441                 priv->regs->rx_dma_ring[priv->rx_tail] = NULL;
 442                 dev_kfree_skb_any(skb);
 443                 priv->rx_tail = ((priv->rx_tail + 1) & RX_DMA_RING_MASK);
 444         }
 445         priv->regs->rx_in = 0;
 446         priv->regs->rx_out = priv->regs->rx_in;
 447         priv->rx_tail = priv->regs->rx_in;
 448
 449         /*
 450          * TX clean up
 451          */
 452         BUG_ON(priv->regs->tx_out != priv->regs->tx_in);
 453         ubi32_eth_tx_done(dev);
 454         BUG_ON(priv->tx_tail != priv->regs->tx_in);
 455         priv->regs->tx_in = 0;
 456         priv->regs->tx_out = priv->regs->tx_in;
 457         priv->tx_tail = priv->regs->tx_in;
 458
 459         return 0;
 460 }
 461
 462 /*
 463  * ubi32_eth_set_config
 464  */
 465 static int ubi32_eth_set_config(struct net_device *dev, struct ifmap *map)
 466 {
 467         /* if must to down to config it */
 468         printk(KERN_INFO "set_config %x\n", dev->flags);
 469         if (dev->flags & IFF_UP)
 470                 return -EBUSY;
 471
 472         /* I/O and IRQ can not be changed */
 473         if (map->base_addr != dev->base_addr) {
 474                 printk(KERN_WARNING "%s: Can't change I/O address\n", dev->name);
 475                 return -EOPNOTSUPP;
 476         }
 477
 478 #ifndef UBICOM32_USE_POLLING
 479         if (map->irq != dev->irq) {
 480                 printk(KERN_WARNING "%s: Can't change IRQ\n", dev->name);
 481                 return -EOPNOTSUPP;
 482         }
 483 #endif
 484
 485         /* ignore other fields */
 486         return 0;
 487 }
 488
 489 static int ubi32_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 490 {
 491         struct ubi32_eth_private *priv = netdev_priv(dev);
 492         struct ubi32_eth_dma_desc *desc = NULL;
 493         unsigned short space, tx_in;
 494
 495         tx_in = priv->regs->tx_in;
 496
 497         dev->trans_start = jiffies; /* save the timestamp */
 498         space = TX_DMA_RING_MASK - ((TX_DMA_RING_SIZE + tx_in - priv->tx_tail) & TX_DMA_RING_MASK);
 499
 500         if (unlikely(space == 0)) {
 501                 if (!(priv->regs->status & UBI32_ETH_VP_STATUS_TX_Q_FULL)) {
 502                         spin_lock(&priv->lock);
 503                         if (!(priv->regs->status & UBI32_ETH_VP_STATUS_TX_Q_FULL)) {
 504                                 priv->regs->status |= UBI32_ETH_VP_STATUS_TX_Q_FULL;
 505                                 priv->vp_stats.tx_q_full_cnt++;
 506                                 netif_stop_queue(dev);
 507                         }
 508                         spin_unlock(&priv->lock);
 509                 }
 510
 511                 /* give both HW and this driver an extra trigger */
 512                 priv->regs->int_mask |= UBI32_ETH_VP_INT_TX;
 513 #ifndef UBICOM32_USE_POLLING
 514                 ubicom32_set_interrupt(dev->irq);
 515 #endif
 516                 ubicom32_set_interrupt(priv->vp_int_bit);
 517
 518                 return NETDEV_TX_BUSY;
 519         }
 520
 521         /*still have room */
 522         desc = (struct ubi32_eth_dma_desc *)skb->cb;
 523         desc->data_pointer = skb->data;
 524         desc->data_len = skb->len;
 525         priv->regs->tx_dma_ring[tx_in] = desc;
 526         tx_in = ((tx_in + 1) & TX_DMA_RING_MASK);
 527         wmb();
 528         priv->regs->tx_in = tx_in;
 529         /* kick the HRT */
 530         ubicom32_set_interrupt(priv->vp_int_bit);
 531
 532         return NETDEV_TX_OK;
 533 }
 534
 535 /*
 536  * Deal with a transmit timeout.
 537  */
 538 static void ubi32_eth_tx_timeout (struct net_device *dev)
 539 {
 540         struct ubi32_eth_private *priv = netdev_priv(dev);
 541         dev->stats.tx_errors++;
 542         priv->regs->int_mask |= UBI32_ETH_VP_INT_TX;
 543 #ifndef UBICOM32_USE_POLLING
 544         ubicom32_set_interrupt(dev->irq);
 545 #endif
 546         ubicom32_set_interrupt(priv->vp_int_bit);
 547 }
 548
 549 static int ubi32_eth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 550 {
 551         struct ubi32_eth_private *priv = netdev_priv(dev);
 552         struct mii_ioctl_data *data = if_mii(rq);
 553
 554         printk(KERN_INFO "ioctl %s, %d\n", dev->name, cmd);
 555         switch (cmd) {
 556         case SIOCGMIIPHY:
 557                 data->phy_id = 0;
 558                 break;
 559
 560         case SIOCGMIIREG:
 561                 if ((data->reg_num & 0x1F) == MII_BMCR) {
 562                         /* Make up MII control register value from what we know */
 563                         data->val_out = 0x0000
 564                         | ((priv->regs->status & UBI32_ETH_VP_STATUS_DUPLEX)
 565                                         ? BMCR_FULLDPLX : 0)
 566                         | ((priv->regs->status & UBI32_ETH_VP_STATUS_SPEED100)
 567                                         ? BMCR_SPEED100 : 0)
 568                         | ((priv->regs->status & UBI32_ETH_VP_STATUS_SPEED1000)
 569                                         ? BMCR_SPEED1000 : 0);
 570                 } else if ((data->reg_num & 0x1F) == MII_BMSR) {
 571                         /* Make up MII status register value from what we know */
 572                         data->val_out =
 573                         (BMSR_100FULL|BMSR_100HALF|BMSR_10FULL|BMSR_10HALF)
 574                         | ((priv->regs->status & UBI32_ETH_VP_STATUS_LINK)
 575                                         ? BMSR_LSTATUS : 0);
 576                 } else {
 577                         return -EIO;
 578                 }
 579                 break;
 580
 581         case SIOCSMIIREG:
 582                 return -EOPNOTSUPP;
 583                 break;
 584
 585         default:
 586                 return -EOPNOTSUPP;
 587         }
 588
 589         return 0;
 590 }
 591
 592 /*
 593  * Return statistics to the caller
 594  */
 595 static struct net_device_stats *ubi32_eth_get_stats(struct net_device *dev)
 596 {
 597         return &dev->stats;
 598 }
 599
 600
 601 static int ubi32_eth_change_mtu(struct net_device *dev, int new_mtu)
 602 {
 603         struct ubi32_eth_private *priv = netdev_priv(dev);
 604         unsigned long flags;
 605
 606         if ((new_mtu < 68) || (new_mtu > 1500))
 607                 return -EINVAL;
 608
 609         spin_lock_irqsave(&priv->lock, flags);
 610         dev->mtu = new_mtu;
 611         spin_unlock_irqrestore(&priv->lock, flags);
 612         printk(KERN_INFO "set mtu to %d", new_mtu);
 613         return 0;
 614 }
 615
 616 /*
 617  * ubi32_eth_cleanup: unload the module
 618  */
 619 void ubi32_eth_cleanup(void)
 620 {
 621         struct ubi32_eth_private *priv;
 622         struct net_device *dev;
 623         int i;
 624
 625         for (i = 0; i < UBI32_ETH_NUM_OF_DEVICES; i++) {
 626                 dev = ubi32_eth_devices[i];
 627                 if (dev) {
 628                         priv = netdev_priv(dev);
 629                         kfree(priv->regs->tx_dma_ring);
 630                         unregister_netdev(dev);
 631                         free_netdev(dev);
 632                         ubi32_eth_devices[i] = NULL;
 633                 }
 634         }
 635 }
 636
 637         static const struct net_device_ops ubi32_netdev_ops = {
 638                 .ndo_open               = ubi32_eth_open,
 639                 .ndo_stop               = ubi32_eth_close,
 640                 .ndo_start_xmit         = ubi32_eth_start_xmit,
 641                 .ndo_tx_timeout         = ubi32_eth_tx_timeout,
 642                 .ndo_do_ioctl           = ubi32_eth_ioctl,
 643                 .ndo_change_mtu         = ubi32_eth_change_mtu,
 644                 .ndo_set_config         = ubi32_eth_set_config,
 645                 .ndo_get_stats          = ubi32_eth_get_stats,
 646                 .ndo_validate_addr      = eth_validate_addr,
 647                 .ndo_set_mac_address    = eth_mac_addr,
 648         };
 649
 650 int ubi32_eth_init_module(void)
 651 {
 652         struct ethtionode *eth_node;
 653         struct net_device *dev;
 654         struct ubi32_eth_private *priv;
 655         int i, err;
 656
 657         /*
 658          * Device allocation.
 659          */
 660         err = 0;
 661         for (i = 0; i < UBI32_ETH_NUM_OF_DEVICES; i++) {
 662                 /*
 663                  * See if the eth_vp is in the device tree.
 664                  */
 665                 eth_node = (struct ethtionode *)devtree_find_node(eth_if_name[i]);
 666                 if (!eth_node) {
 667                         printk(KERN_INFO "%s does not exist\n", eth_if_name[i]);
 668                         continue;
 669                 }
 670
 671                 eth_node->tx_dma_ring = (struct ubi32_eth_dma_desc **)kmalloc(
 672                                 sizeof(struct ubi32_eth_dma_desc *) *
 673                                 (TX_DMA_RING_SIZE + RX_DMA_RING_SIZE),
 674                                 GFP_ATOMIC | __GFP_NOWARN | __GFP_NORETRY | GFP_DMA);
 675
 676                 if (eth_node->tx_dma_ring == NULL) {
 677                         eth_node->tx_dma_ring = (struct ubi32_eth_dma_desc **)kmalloc(
 678                                 sizeof(struct ubi32_eth_dma_desc *) *
 679                                 (TX_DMA_RING_SIZE + RX_DMA_RING_SIZE), GFP_KERNEL);
 680                         printk(KERN_INFO "fail to allocate from OCM\n");
 681                 }
 682
 683                 if (!eth_node->tx_dma_ring) {
 684                         err = -ENOMEM;
 685                         break;
 686                 }
 687                 eth_node->rx_dma_ring = eth_node->tx_dma_ring + TX_DMA_RING_SIZE;
 688                 eth_node->tx_sz = TX_DMA_RING_SIZE - 1;
 689                 eth_node->rx_sz = RX_DMA_RING_SIZE - 1;
 690
 691                 dev = alloc_etherdev(sizeof(struct ubi32_eth_private));
 692                 if (!dev) {
 693                         kfree(eth_node->tx_dma_ring);
 694                         err = -ENOMEM;
 695                         break;
 696                 }
 697                 priv = netdev_priv(dev);
 698                 priv->dev = dev;
 699
 700                 /*
 701                  * This just fill in some default Ubicom MAC address
 702                  */
 703                 memcpy(dev->dev_addr, mac_addr[i], ETH_ALEN);
 704                 memset(dev->broadcast, 0xff, ETH_ALEN);
 705
 706                 priv->regs = eth_node;
 707                 priv->regs->command = 0;
 708                 priv->regs->int_mask = 0;
 709                 priv->regs->int_status = 0;
 710                 priv->regs->tx_out = 0;
 711                 priv->regs->rx_out = 0;
 712                 priv->regs->tx_in = 0;
 713                 priv->regs->rx_in = 0;
 714                 priv->rx_tail = 0;
 715                 priv->tx_tail = 0;
 716
 717                 priv->vp_int_bit = eth_node->dn.sendirq;
 718                 dev->irq = eth_node->dn.recvirq;
 719
 720                 spin_lock_init(&priv->lock);
 721
 722                 dev->netdev_ops = &ubi32_netdev_ops;
 723
 724                 dev->watchdog_timeo     = UBI32_ETH_VP_TX_TIMEOUT;
 725 #ifdef UBICOM32_USE_NAPI
 726                 netif_napi_add(dev, &priv->napi, ubi32_eth_napi_poll, UBI32_ETH_NAPI_WEIGHT);
 727 #endif
 728                 err = register_netdev(dev);
 729                 if (err) {
 730                         printk(KERN_WARNING "Failed to register netdev %s\n", eth_if_name[i]);
 731                         //release_region();
 732                         free_netdev(dev);
 733                         kfree(eth_node->tx_dma_ring);
 734                         break;
 735                 }
 736
 737                 ubi32_eth_devices[i] = dev;
 738                 printk(KERN_INFO "%s vp_base:0x%p, tio_int:%d irq:%d feature:0x%lx\n",
 739                         dev->name, priv->regs, eth_node->dn.sendirq, dev->irq, dev->features);
 740         }
 741
 742         if (err) {
 743                 ubi32_eth_cleanup();
 744                 return err;
 745         }
 746
 747         if (!ubi32_eth_devices[0] && !ubi32_eth_devices[1]) {
 748                 return -ENODEV;
 749         }
 750
 751 #if defined(UBICOM32_USE_POLLING)
 752         init_timer(&eth_poll_timer);
 753         eth_poll_timer.function = ubi32_eth_poll;
 754         eth_poll_timer.data = (unsigned long)0;
 755         eth_poll_timer.expires = jiffies + 2;
 756         add_timer(&eth_poll_timer);
 757 #endif
 758
 759         return 0;
 760 }
 761
 762 module_init(ubi32_eth_init_module);
 763 module_exit(ubi32_eth_cleanup);
 764
 765 MODULE_AUTHOR("Kan Yan, Greg Ren");
 766 MODULE_LICENSE("GPL");