drivers/net/korina.c

   1 /*
   2  *  Driver for the IDT RC32434 (Korina) on-chip ethernet controller.
   3  *
   4  *  Copyright 2004 IDT Inc. (rischelp@idt.com)
   5  *  Copyright 2006 Felix Fietkau <nbd@openwrt.org>
   6  *  Copyright 2008 Florian Fainelli <florian@openwrt.org>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  14  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  15  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  16  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  17  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  19  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  20  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  21  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  *
  24  *  You should have received a copy of the  GNU General Public License along
  25  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  26  *  675 Mass Ave, Cambridge, MA 02139, USA.
  27  *
  28  *  Writing to a DMA status register:
  29  *
  30  *  When writing to the status register, you should mask the bit you have
  31  *  been testing the status register with. Both Tx and Rx DMA registers
  32  *  should stick to this procedure.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/kernel.h>
  37 #include <linux/moduleparam.h>
  38 #include <linux/sched.h>
  39 #include <linux/ctype.h>
  40 #include <linux/types.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/init.h>
  43 #include <linux/ioport.h>
  44 #include <linux/in.h>
  45 #include <linux/slab.h>
  46 #include <linux/string.h>
  47 #include <linux/delay.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/etherdevice.h>
  50 #include <linux/skbuff.h>
  51 #include <linux/errno.h>
  52 #include <linux/platform_device.h>
  53 #include <linux/mii.h>
  54 #include <linux/ethtool.h>
  55 #include <linux/crc32.h>
  56
  57 #include <asm/bootinfo.h>
  58 #include <asm/system.h>
  59 #include <asm/bitops.h>
  60 #include <asm/pgtable.h>
  61 #include <asm/segment.h>
  62 #include <asm/io.h>
  63 #include <asm/dma.h>
  64
  65 #include <asm/mach-rc32434/rb.h>
  66 #include <asm/mach-rc32434/rc32434.h>
  67 #include <asm/mach-rc32434/eth.h>
  68 #include <asm/mach-rc32434/dma_v.h>
  69
  70 #define DRV_NAME        "korina"
  71 #define DRV_VERSION     "0.10"
  72 #define DRV_RELDATE     "04Mar2008"
  73
  74 #define STATION_ADDRESS_HIGH(dev) (((dev)->dev_addr[0] << 8) | \
  75                                    ((dev)->dev_addr[1]))
  76 #define STATION_ADDRESS_LOW(dev)  (((dev)->dev_addr[2] << 24) | \
  77                                    ((dev)->dev_addr[3] << 16) | \
  78                                    ((dev)->dev_addr[4] << 8)  | \
  79                                    ((dev)->dev_addr[5]))
  80
  81 #define MII_CLOCK 1250000       /* no more than 2.5MHz */
  82
  83 /* the following must be powers of two */
  84 #define KORINA_NUM_RDS  64  /* number of receive descriptors */
  85 #define KORINA_NUM_TDS  64  /* number of transmit descriptors */
  86
  87 /* KORINA_RBSIZE is the hardware's default maximum receive
  88  * frame size in bytes. Having this hardcoded means that there
  89  * is no support for MTU sizes greater than 1500. */
  90 #define KORINA_RBSIZE   1536 /* size of one resource buffer = Ether MTU */
  91 #define KORINA_RDS_MASK (KORINA_NUM_RDS - 1)
  92 #define KORINA_TDS_MASK (KORINA_NUM_TDS - 1)
  93 #define RD_RING_SIZE    (KORINA_NUM_RDS * sizeof(struct dma_desc))
  94 #define TD_RING_SIZE    (KORINA_NUM_TDS * sizeof(struct dma_desc))
  95
  96 #define TX_TIMEOUT      (6000 * HZ / 1000)
  97
  98 enum chain_status { desc_filled, desc_empty };
  99 #define IS_DMA_FINISHED(X)   (((X) & (DMA_DESC_FINI)) != 0)
 100 #define IS_DMA_DONE(X)   (((X) & (DMA_DESC_DONE)) != 0)
 101 #define RCVPKT_LENGTH(X)     (((X) & ETH_RX_LEN) >> ETH_RX_LEN_BIT)
 102
 103 /* Information that need to be kept for each board. */
 104 struct korina_private {
 105         struct eth_regs *eth_regs;
 106         struct dma_reg *rx_dma_regs;
 107         struct dma_reg *tx_dma_regs;
 108         struct dma_desc *td_ring; /* transmit descriptor ring */
 109         struct dma_desc *rd_ring; /* receive descriptor ring  */
 110
 111         struct sk_buff *tx_skb[KORINA_NUM_TDS];
 112         struct sk_buff *rx_skb[KORINA_NUM_RDS];
 113
 114         int rx_next_done;
 115         int rx_chain_head;
 116         int rx_chain_tail;
 117         enum chain_status rx_chain_status;
 118
 119         int tx_next_done;
 120         int tx_chain_head;
 121         int tx_chain_tail;
 122         enum chain_status tx_chain_status;
 123         int tx_count;
 124         int tx_full;
 125
 126         int rx_irq;
 127         int tx_irq;
 128         int ovr_irq;
 129         int und_irq;
 130
 131         spinlock_t lock;        /* NIC xmit lock */
 132
 133         int dma_halt_cnt;
 134         int dma_run_cnt;
 135         struct napi_struct napi;
 136         struct mii_if_info mii_if;
 137         struct net_device *dev;
 138         int phy_addr;
 139 };
 140
 141 extern unsigned int idt_cpu_freq;
 142
 143 static inline void korina_start_dma(struct dma_reg *ch, u32 dma_addr)
 144 {
 145         writel(0, &ch->dmandptr);
 146         writel(dma_addr, &ch->dmadptr);
 147 }
 148
 149 static inline void korina_abort_dma(struct net_device *dev,
 150                                         struct dma_reg *ch)
 151 {
 152        if (readl(&ch->dmac) & DMA_CHAN_RUN_BIT) {
 153                writel(0x10, &ch->dmac);
 154
 155                while (!(readl(&ch->dmas) & DMA_STAT_HALT))
 156                        dev->trans_start = jiffies;
 157
 158                writel(0, &ch->dmas);
 159        }
 160
 161        writel(0, &ch->dmadptr);
 162        writel(0, &ch->dmandptr);
 163 }
 164
 165 static inline void korina_chain_dma(struct dma_reg *ch, u32 dma_addr)
 166 {
 167         writel(dma_addr, &ch->dmandptr);
 168 }
 169
 170 static void korina_abort_tx(struct net_device *dev)
 171 {
 172         struct korina_private *lp = netdev_priv(dev);
 173
 174         korina_abort_dma(dev, lp->tx_dma_regs);
 175 }
 176
 177 static void korina_abort_rx(struct net_device *dev)
 178 {
 179         struct korina_private *lp = netdev_priv(dev);
 180
 181         korina_abort_dma(dev, lp->rx_dma_regs);
 182 }
 183
 184 static void korina_start_rx(struct korina_private *lp,
 185                                         struct dma_desc *rd)
 186 {
 187         korina_start_dma(lp->rx_dma_regs, CPHYSADDR(rd));
 188 }
 189
 190 static void korina_chain_rx(struct korina_private *lp,
 191                                         struct dma_desc *rd)
 192 {
 193         korina_chain_dma(lp->rx_dma_regs, CPHYSADDR(rd));
 194 }
 195
 196 /* transmit packet */
 197 static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 198 {
 199         struct korina_private *lp = netdev_priv(dev);
 200         unsigned long flags;
 201         u32 length;
 202         u32 chain_prev, chain_next;
 203         struct dma_desc *td;
 204
 205         spin_lock_irqsave(&lp->lock, flags);
 206
 207         td = &lp->td_ring[lp->tx_chain_tail];
 208
 209         /* stop queue when full, drop pkts if queue already full */
 210         if (lp->tx_count >= (KORINA_NUM_TDS - 2)) {
 211                 lp->tx_full = 1;
 212
 213                 if (lp->tx_count == (KORINA_NUM_TDS - 2))
 214                         netif_stop_queue(dev);
 215                 else {
 216                         dev->stats.tx_dropped++;
 217                         dev_kfree_skb_any(skb);
 218                         spin_unlock_irqrestore(&lp->lock, flags);
 219
 220                         return NETDEV_TX_BUSY;
 221                 }
 222         }
 223
 224         lp->tx_count++;
 225
 226         lp->tx_skb[lp->tx_chain_tail] = skb;
 227
 228         length = skb->len;
 229         dma_cache_wback((u32)skb->data, skb->len);
 230
 231         /* Setup the transmit descriptor. */
 232         dma_cache_inv((u32) td, sizeof(*td));
 233         td->ca = CPHYSADDR(skb->data);
 234         chain_prev = (lp->tx_chain_tail - 1) & KORINA_TDS_MASK;
 235         chain_next = (lp->tx_chain_tail + 1) & KORINA_TDS_MASK;
 236
 237         if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) {
 238                 if (lp->tx_chain_status == desc_empty) {
 239                         /* Update tail */
 240                         td->control = DMA_COUNT(length) |
 241                                         DMA_DESC_COF | DMA_DESC_IOF;
 242                         /* Move tail */
 243                         lp->tx_chain_tail = chain_next;
 244                         /* Write to NDPTR */
 245                         writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
 246                                         &lp->tx_dma_regs->dmandptr);
 247                         /* Move head to tail */
 248                         lp->tx_chain_head = lp->tx_chain_tail;
 249                 } else {
 250                         /* Update tail */
 251                         td->control = DMA_COUNT(length) |
 252                                         DMA_DESC_COF | DMA_DESC_IOF;
 253                         /* Link to prev */
 254                         lp->td_ring[chain_prev].control &=
 255                                         ~DMA_DESC_COF;
 256                         /* Link to prev */
 257                         lp->td_ring[chain_prev].link =  CPHYSADDR(td);
 258                         /* Move tail */
 259                         lp->tx_chain_tail = chain_next;
 260                         /* Write to NDPTR */
 261                         writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
 262                                         &(lp->tx_dma_regs->dmandptr));
 263                         /* Move head to tail */
 264                         lp->tx_chain_head = lp->tx_chain_tail;
 265                         lp->tx_chain_status = desc_empty;
 266                 }
 267         } else {
 268                 if (lp->tx_chain_status == desc_empty) {
 269                         /* Update tail */
 270                         td->control = DMA_COUNT(length) |
 271                                         DMA_DESC_COF | DMA_DESC_IOF;
 272                         /* Move tail */
 273                         lp->tx_chain_tail = chain_next;
 274                         lp->tx_chain_status = desc_filled;
 275                 } else {
 276                         /* Update tail */
 277                         td->control = DMA_COUNT(length) |
 278                                         DMA_DESC_COF | DMA_DESC_IOF;
 279                         lp->td_ring[chain_prev].control &=
 280                                         ~DMA_DESC_COF;
 281                         lp->td_ring[chain_prev].link =  CPHYSADDR(td);
 282                         lp->tx_chain_tail = chain_next;
 283                 }
 284         }
 285         dma_cache_wback((u32) td, sizeof(*td));
 286
 287         dev->trans_start = jiffies;
 288         spin_unlock_irqrestore(&lp->lock, flags);
 289
 290         return NETDEV_TX_OK;
 291 }
 292
 293 static int mdio_read(struct net_device *dev, int mii_id, int reg)
 294 {
 295         struct korina_private *lp = netdev_priv(dev);
 296         int ret;
 297
 298         mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
 299
 300         writel(0, &lp->eth_regs->miimcfg);
 301         writel(0, &lp->eth_regs->miimcmd);
 302         writel(mii_id | reg, &lp->eth_regs->miimaddr);
 303         writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
 304
 305         ret = (int)(readl(&lp->eth_regs->miimrdd));
 306         return ret;
 307 }
 308
 309 static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
 310 {
 311         struct korina_private *lp = netdev_priv(dev);
 312
 313         mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
 314
 315         writel(0, &lp->eth_regs->miimcfg);
 316         writel(1, &lp->eth_regs->miimcmd);
 317         writel(mii_id | reg, &lp->eth_regs->miimaddr);
 318         writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
 319         writel(val, &lp->eth_regs->miimwtd);
 320 }
 321
 322 /* Ethernet Rx DMA interrupt */
 323 static irqreturn_t korina_rx_dma_interrupt(int irq, void *dev_id)
 324 {
 325         struct net_device *dev = dev_id;
 326         struct korina_private *lp = netdev_priv(dev);
 327         u32 dmas, dmasm;
 328         irqreturn_t retval;
 329
 330         dmas = readl(&lp->rx_dma_regs->dmas);
 331         if (dmas & (DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR)) {
 332                 dmasm = readl(&lp->rx_dma_regs->dmasm);
 333                 writel(dmasm | (DMA_STAT_DONE |
 334                                 DMA_STAT_HALT | DMA_STAT_ERR),
 335                                 &lp->rx_dma_regs->dmasm);
 336
 337                 netif_rx_schedule(&lp->napi);
 338
 339                 if (dmas & DMA_STAT_ERR)
 340                         printk(KERN_ERR DRV_NAME "%s: DMA error\n", dev->name);
 341
 342                 retval = IRQ_HANDLED;
 343         } else
 344                 retval = IRQ_NONE;
 345
 346         return retval;
 347 }
 348
 349 static int korina_rx(struct net_device *dev, int limit)
 350 {
 351         struct korina_private *lp = netdev_priv(dev);
 352         struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
 353         struct sk_buff *skb, *skb_new;
 354         u8 *pkt_buf;
 355         u32 devcs, pkt_len, dmas;
 356         int count;
 357
 358         dma_cache_inv((u32)rd, sizeof(*rd));
 359
 360         for (count = 0; count < limit; count++) {
 361                 skb = lp->rx_skb[lp->rx_next_done];
 362                 skb_new = NULL;
 363
 364                 devcs = rd->devcs;
 365
 366                 if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
 367                         break;
 368
 369                 /* Update statistics counters */
 370                 if (devcs & ETH_RX_CRC)
 371                         dev->stats.rx_crc_errors++;
 372                 if (devcs & ETH_RX_LOR)
 373                         dev->stats.rx_length_errors++;
 374                 if (devcs & ETH_RX_LE)
 375                         dev->stats.rx_length_errors++;
 376                 if (devcs & ETH_RX_OVR)
 377                         dev->stats.rx_over_errors++;
 378                 if (devcs & ETH_RX_CV)
 379                         dev->stats.rx_frame_errors++;
 380                 if (devcs & ETH_RX_CES)
 381                         dev->stats.rx_length_errors++;
 382                 if (devcs & ETH_RX_MP)
 383                         dev->stats.multicast++;
 384
 385                 if ((devcs & ETH_RX_LD) != ETH_RX_LD) {
 386                         /* check that this is a whole packet
 387                          * WARNING: DMA_FD bit incorrectly set
 388                          * in Rc32434 (errata ref #077) */
 389                         dev->stats.rx_errors++;
 390                         dev->stats.rx_dropped++;
 391                 } else if ((devcs & ETH_RX_ROK)) {
 392                         pkt_len = RCVPKT_LENGTH(devcs);
 393
 394                         /* must be the (first and) last
 395                          * descriptor then */
 396                         pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
 397
 398                         /* invalidate the cache */
 399                         dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
 400
 401                         /* Malloc up new buffer. */
 402                         skb_new = netdev_alloc_skb(dev, KORINA_RBSIZE + 2);
 403
 404                         if (!skb_new)
 405                                 break;
 406                         /* Do not count the CRC */
 407                         skb_put(skb, pkt_len - 4);
 408                         skb->protocol = eth_type_trans(skb, dev);
 409
 410                         /* Pass the packet to upper layers */
 411                         netif_receive_skb(skb);
 412                         dev->stats.rx_packets++;
 413                         dev->stats.rx_bytes += pkt_len;
 414
 415                         /* Update the mcast stats */
 416                         if (devcs & ETH_RX_MP)
 417                                 dev->stats.multicast++;
 418
 419                         lp->rx_skb[lp->rx_next_done] = skb_new;
 420                 }
 421
 422                 rd->devcs = 0;
 423
 424                 /* Restore descriptor's curr_addr */
 425                 if (skb_new)
 426                         rd->ca = CPHYSADDR(skb_new->data);
 427                 else
 428                         rd->ca = CPHYSADDR(skb->data);
 429
 430                 rd->control = DMA_COUNT(KORINA_RBSIZE) |
 431                         DMA_DESC_COD | DMA_DESC_IOD;
 432                 lp->rd_ring[(lp->rx_next_done - 1) &
 433                         KORINA_RDS_MASK].control &=
 434                         ~DMA_DESC_COD;
 435
 436                 lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
 437                 dma_cache_wback((u32)rd, sizeof(*rd));
 438                 rd = &lp->rd_ring[lp->rx_next_done];
 439                 writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
 440         }
 441
 442         dmas = readl(&lp->rx_dma_regs->dmas);
 443
 444         if (dmas & DMA_STAT_HALT) {
 445                 writel(~(DMA_STAT_HALT | DMA_STAT_ERR),
 446                                 &lp->rx_dma_regs->dmas);
 447
 448                 lp->dma_halt_cnt++;
 449                 rd->devcs = 0;
 450                 skb = lp->rx_skb[lp->rx_next_done];
 451                 rd->ca = CPHYSADDR(skb->data);
 452                 dma_cache_wback((u32)rd, sizeof(*rd));
 453                 korina_chain_rx(lp, rd);
 454         }
 455
 456         return count;
 457 }
 458
 459 static int korina_poll(struct napi_struct *napi, int budget)
 460 {
 461         struct korina_private *lp =
 462                 container_of(napi, struct korina_private, napi);
 463         struct net_device *dev = lp->dev;
 464         int work_done;
 465
 466         work_done = korina_rx(dev, budget);
 467         if (work_done < budget) {
 468                 netif_rx_complete(napi);
 469
 470                 writel(readl(&lp->rx_dma_regs->dmasm) &
 471                         ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
 472                         &lp->rx_dma_regs->dmasm);
 473         }
 474         return work_done;
 475 }
 476
 477 /*
 478  * Set or clear the multicast filter for this adaptor.
 479  */
 480 static void korina_multicast_list(struct net_device *dev)
 481 {
 482         struct korina_private *lp = netdev_priv(dev);
 483         unsigned long flags;
 484         struct dev_mc_list *dmi = dev->mc_list;
 485         u32 recognise = ETH_ARC_AB;     /* always accept broadcasts */
 486         int i;
 487
 488         /* Set promiscuous mode */
 489         if (dev->flags & IFF_PROMISC)
 490                 recognise |= ETH_ARC_PRO;
 491
 492         else if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 4))
 493                 /* All multicast and broadcast */
 494                 recognise |= ETH_ARC_AM;
 495
 496         /* Build the hash table */
 497         if (dev->mc_count > 4) {
 498                 u16 hash_table[4];
 499                 u32 crc;
 500
 501                 for (i = 0; i < 4; i++)
 502                         hash_table[i] = 0;
 503
 504                 for (i = 0; i < dev->mc_count; i++) {
 505                         char *addrs = dmi->dmi_addr;
 506
 507                         dmi = dmi->next;
 508
 509                         if (!(*addrs & 1))
 510                                 continue;
 511
 512                         crc = ether_crc_le(6, addrs);
 513                         crc >>= 26;
 514                         hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
 515                 }
 516                 /* Accept filtered multicast */
 517                 recognise |= ETH_ARC_AFM;
 518
 519                 /* Fill the MAC hash tables with their values */
 520                 writel((u32)(hash_table[1] << 16 | hash_table[0]),
 521                                         &lp->eth_regs->ethhash0);
 522                 writel((u32)(hash_table[3] << 16 | hash_table[2]),
 523                                         &lp->eth_regs->ethhash1);
 524         }
 525
 526         spin_lock_irqsave(&lp->lock, flags);
 527         writel(recognise, &lp->eth_regs->etharc);
 528         spin_unlock_irqrestore(&lp->lock, flags);
 529 }
 530
 531 static void korina_tx(struct net_device *dev)
 532 {
 533         struct korina_private *lp = netdev_priv(dev);
 534         struct dma_desc *td = &lp->td_ring[lp->tx_next_done];
 535         u32 devcs;
 536         u32 dmas;
 537
 538         spin_lock(&lp->lock);
 539
 540         /* Process all desc that are done */
 541         while (IS_DMA_FINISHED(td->control)) {
 542                 if (lp->tx_full == 1) {
 543                         netif_wake_queue(dev);
 544                         lp->tx_full = 0;
 545                 }
 546
 547                 devcs = lp->td_ring[lp->tx_next_done].devcs;
 548                 if ((devcs & (ETH_TX_FD | ETH_TX_LD)) !=
 549                                 (ETH_TX_FD | ETH_TX_LD)) {
 550                         dev->stats.tx_errors++;
 551                         dev->stats.tx_dropped++;
 552
 553                         /* Should never happen */
 554                         printk(KERN_ERR DRV_NAME "%s: split tx ignored\n",
 555                                                         dev->name);
 556                 } else if (devcs & ETH_TX_TOK) {
 557                         dev->stats.tx_packets++;
 558                         dev->stats.tx_bytes +=
 559                                         lp->tx_skb[lp->tx_next_done]->len;
 560                 } else {
 561                         dev->stats.tx_errors++;
 562                         dev->stats.tx_dropped++;
 563
 564                         /* Underflow */
 565                         if (devcs & ETH_TX_UND)
 566                                 dev->stats.tx_fifo_errors++;
 567
 568                         /* Oversized frame */
 569                         if (devcs & ETH_TX_OF)
 570                                 dev->stats.tx_aborted_errors++;
 571
 572                         /* Excessive deferrals */
 573                         if (devcs & ETH_TX_ED)
 574                                 dev->stats.tx_carrier_errors++;
 575
 576                         /* Collisions: medium busy */
 577                         if (devcs & ETH_TX_EC)
 578                                 dev->stats.collisions++;
 579
 580                         /* Late collision */
 581                         if (devcs & ETH_TX_LC)
 582                                 dev->stats.tx_window_errors++;
 583                 }
 584
 585                 /* We must always free the original skb */
 586                 if (lp->tx_skb[lp->tx_next_done]) {
 587                         dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]);
 588                         lp->tx_skb[lp->tx_next_done] = NULL;
 589                 }
 590
 591                 lp->td_ring[lp->tx_next_done].control = DMA_DESC_IOF;
 592                 lp->td_ring[lp->tx_next_done].devcs = ETH_TX_FD | ETH_TX_LD;
 593                 lp->td_ring[lp->tx_next_done].link = 0;
 594                 lp->td_ring[lp->tx_next_done].ca = 0;
 595                 lp->tx_count--;
 596
 597                 /* Go on to next transmission */
 598                 lp->tx_next_done = (lp->tx_next_done + 1) & KORINA_TDS_MASK;
 599                 td = &lp->td_ring[lp->tx_next_done];
 600
 601         }
 602
 603         /* Clear the DMA status register */
 604         dmas = readl(&lp->tx_dma_regs->dmas);
 605         writel(~dmas, &lp->tx_dma_regs->dmas);
 606
 607         writel(readl(&lp->tx_dma_regs->dmasm) &
 608                         ~(DMA_STAT_FINI | DMA_STAT_ERR),
 609                         &lp->tx_dma_regs->dmasm);
 610
 611         spin_unlock(&lp->lock);
 612 }
 613
 614 static irqreturn_t
 615 korina_tx_dma_interrupt(int irq, void *dev_id)
 616 {
 617         struct net_device *dev = dev_id;
 618         struct korina_private *lp = netdev_priv(dev);
 619         u32 dmas, dmasm;
 620         irqreturn_t retval;
 621
 622         dmas = readl(&lp->tx_dma_regs->dmas);
 623
 624         if (dmas & (DMA_STAT_FINI | DMA_STAT_ERR)) {
 625                 dmasm = readl(&lp->tx_dma_regs->dmasm);
 626                 writel(dmasm | (DMA_STAT_FINI | DMA_STAT_ERR),
 627                                 &lp->tx_dma_regs->dmasm);
 628
 629                 korina_tx(dev);
 630
 631                 if (lp->tx_chain_status == desc_filled &&
 632                         (readl(&(lp->tx_dma_regs->dmandptr)) == 0)) {
 633                         writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
 634                                 &(lp->tx_dma_regs->dmandptr));
 635                         lp->tx_chain_status = desc_empty;
 636                         lp->tx_chain_head = lp->tx_chain_tail;
 637                         dev->trans_start = jiffies;
 638                 }
 639                 if (dmas & DMA_STAT_ERR)
 640                         printk(KERN_ERR DRV_NAME "%s: DMA error\n", dev->name);
 641
 642                 retval = IRQ_HANDLED;
 643         } else
 644                 retval = IRQ_NONE;
 645
 646         return retval;
 647 }
 648
 649
 650 static void korina_check_media(struct net_device *dev, unsigned int init_media)
 651 {
 652         struct korina_private *lp = netdev_priv(dev);
 653
 654         mii_check_media(&lp->mii_if, 0, init_media);
 655
 656         if (lp->mii_if.full_duplex)
 657                 writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
 658                                                 &lp->eth_regs->ethmac2);
 659         else
 660                 writel(readl(&lp->eth_regs->ethmac2) & ~ETH_MAC2_FD,
 661                                                 &lp->eth_regs->ethmac2);
 662 }
 663
 664 static void korina_set_carrier(struct mii_if_info *mii)
 665 {
 666         if (mii->force_media) {
 667                 /* autoneg is off: Link is always assumed to be up */
 668                 if (!netif_carrier_ok(mii->dev))
 669                         netif_carrier_on(mii->dev);
 670         } else  /* Let MMI library update carrier status */
 671                 korina_check_media(mii->dev, 0);
 672 }
 673
 674 static int korina_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 675 {
 676         struct korina_private *lp = netdev_priv(dev);
 677         struct mii_ioctl_data *data = if_mii(rq);
 678         int rc;
 679
 680         if (!netif_running(dev))
 681                 return -EINVAL;
 682         spin_lock_irq(&lp->lock);
 683         rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL);
 684         spin_unlock_irq(&lp->lock);
 685         korina_set_carrier(&lp->mii_if);
 686
 687         return rc;
 688 }
 689
 690 /* ethtool helpers */
 691 static void netdev_get_drvinfo(struct net_device *dev,
 692                         struct ethtool_drvinfo *info)
 693 {
 694         struct korina_private *lp = netdev_priv(dev);
 695
 696         strcpy(info->driver, DRV_NAME);
 697         strcpy(info->version, DRV_VERSION);
 698         strcpy(info->bus_info, lp->dev->name);
 699 }
 700
 701 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 702 {
 703         struct korina_private *lp = netdev_priv(dev);
 704         int rc;
 705
 706         spin_lock_irq(&lp->lock);
 707         rc = mii_ethtool_gset(&lp->mii_if, cmd);
 708         spin_unlock_irq(&lp->lock);
 709
 710         return rc;
 711 }
 712
 713 static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 714 {
 715         struct korina_private *lp = netdev_priv(dev);
 716         int rc;
 717
 718         spin_lock_irq(&lp->lock);
 719         rc = mii_ethtool_sset(&lp->mii_if, cmd);
 720         spin_unlock_irq(&lp->lock);
 721         korina_set_carrier(&lp->mii_if);
 722
 723         return rc;
 724 }
 725
 726 static u32 netdev_get_link(struct net_device *dev)
 727 {
 728         struct korina_private *lp = netdev_priv(dev);
 729
 730         return mii_link_ok(&lp->mii_if);
 731 }
 732
 733 static struct ethtool_ops netdev_ethtool_ops = {
 734         .get_drvinfo            = netdev_get_drvinfo,
 735         .get_settings           = netdev_get_settings,
 736         .set_settings           = netdev_set_settings,
 737         .get_link               = netdev_get_link,
 738 };
 739
 740 static void korina_alloc_ring(struct net_device *dev)
 741 {
 742         struct korina_private *lp = netdev_priv(dev);
 743         int i;
 744
 745         /* Initialize the transmit descriptors */
 746         for (i = 0; i < KORINA_NUM_TDS; i++) {
 747                 lp->td_ring[i].control = DMA_DESC_IOF;
 748                 lp->td_ring[i].devcs = ETH_TX_FD | ETH_TX_LD;
 749                 lp->td_ring[i].ca = 0;
 750                 lp->td_ring[i].link = 0;
 751         }
 752         lp->tx_next_done = lp->tx_chain_head = lp->tx_chain_tail =
 753                         lp->tx_full = lp->tx_count = 0;
 754         lp->tx_chain_status = desc_empty;
 755
 756         /* Initialize the receive descriptors */
 757         for (i = 0; i < KORINA_NUM_RDS; i++) {
 758                 struct sk_buff *skb = lp->rx_skb[i];
 759
 760                 skb = dev_alloc_skb(KORINA_RBSIZE + 2);
 761                 if (!skb)
 762                         break;
 763                 skb_reserve(skb, 2);
 764                 lp->rx_skb[i] = skb;
 765                 lp->rd_ring[i].control = DMA_DESC_IOD |
 766                                 DMA_COUNT(KORINA_RBSIZE);
 767                 lp->rd_ring[i].devcs = 0;
 768                 lp->rd_ring[i].ca = CPHYSADDR(skb->data);
 769                 lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[i+1]);
 770         }
 771
 772         /* loop back */
 773         lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[0]);
 774         lp->rx_next_done  = 0;
 775
 776         lp->rd_ring[i].control |= DMA_DESC_COD;
 777         lp->rx_chain_head = 0;
 778         lp->rx_chain_tail = 0;
 779         lp->rx_chain_status = desc_empty;
 780 }
 781
 782 static void korina_free_ring(struct net_device *dev)
 783 {
 784         struct korina_private *lp = netdev_priv(dev);
 785         int i;
 786
 787         for (i = 0; i < KORINA_NUM_RDS; i++) {
 788                 lp->rd_ring[i].control = 0;
 789                 if (lp->rx_skb[i])
 790                         dev_kfree_skb_any(lp->rx_skb[i]);
 791                 lp->rx_skb[i] = NULL;
 792         }
 793
 794         for (i = 0; i < KORINA_NUM_TDS; i++) {
 795                 lp->td_ring[i].control = 0;
 796                 if (lp->tx_skb[i])
 797                         dev_kfree_skb_any(lp->tx_skb[i]);
 798                 lp->tx_skb[i] = NULL;
 799         }
 800 }
 801
 802 /*
 803  * Initialize the RC32434 ethernet controller.
 804  */
 805 static int korina_init(struct net_device *dev)
 806 {
 807         struct korina_private *lp = netdev_priv(dev);
 808
 809         /* Disable DMA */
 810         korina_abort_tx(dev);
 811         korina_abort_rx(dev);
 812
 813         /* reset ethernet logic */
 814         writel(0, &lp->eth_regs->ethintfc);
 815         while ((readl(&lp->eth_regs->ethintfc) & ETH_INT_FC_RIP))
 816                 dev->trans_start = jiffies;
 817
 818         /* Enable Ethernet Interface */
 819         writel(ETH_INT_FC_EN, &lp->eth_regs->ethintfc);
 820
 821         /* Allocate rings */
 822         korina_alloc_ring(dev);
 823
 824         writel(0, &lp->rx_dma_regs->dmas);
 825         /* Start Rx DMA */
 826         korina_start_rx(lp, &lp->rd_ring[0]);
 827
 828         writel(readl(&lp->tx_dma_regs->dmasm) &
 829                         ~(DMA_STAT_FINI | DMA_STAT_ERR),
 830                         &lp->tx_dma_regs->dmasm);
 831         writel(readl(&lp->rx_dma_regs->dmasm) &
 832                         ~(DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR),
 833                         &lp->rx_dma_regs->dmasm);
 834
 835         /* Accept only packets destined for this Ethernet device address */
 836         writel(ETH_ARC_AB, &lp->eth_regs->etharc);
 837
 838         /* Set all Ether station address registers to their initial values */
 839         writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal0);
 840         writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah0);
 841
 842         writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal1);
 843         writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah1);
 844
 845         writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal2);
 846         writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah2);
 847
 848         writel(STATION_ADDRESS_LOW(dev), &lp->eth_regs->ethsal3);
 849         writel(STATION_ADDRESS_HIGH(dev), &lp->eth_regs->ethsah3);
 850
 851
 852         /* Frame Length Checking, Pad Enable, CRC Enable, Full Duplex set */
 853         writel(ETH_MAC2_PE | ETH_MAC2_CEN | ETH_MAC2_FD,
 854                         &lp->eth_regs->ethmac2);
 855
 856         /* Back to back inter-packet-gap */
 857         writel(0x15, &lp->eth_regs->ethipgt);
 858         /* Non - Back to back inter-packet-gap */
 859         writel(0x12, &lp->eth_regs->ethipgr);
 860
 861         /* Management Clock Prescaler Divisor
 862          * Clock independent setting */
 863         writel(((idt_cpu_freq) / MII_CLOCK + 1) & ~1,
 864                        &lp->eth_regs->ethmcp);
 865
 866         /* don't transmit until fifo contains 48b */
 867         writel(48, &lp->eth_regs->ethfifott);
 868
 869         writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1);
 870
 871         napi_enable(&lp->napi);
 872         netif_start_queue(dev);
 873
 874         return 0;
 875 }
 876
 877 /*
 878  * Restart the RC32434 ethernet controller.
 879  * FIXME: check the return status where we call it
 880  */
 881 static int korina_restart(struct net_device *dev)
 882 {
 883         struct korina_private *lp = netdev_priv(dev);
 884         int ret;
 885
 886         /*
 887          * Disable interrupts
 888          */
 889         disable_irq(lp->rx_irq);
 890         disable_irq(lp->tx_irq);
 891         disable_irq(lp->ovr_irq);
 892         disable_irq(lp->und_irq);
 893
 894         writel(readl(&lp->tx_dma_regs->dmasm) |
 895                                 DMA_STAT_FINI | DMA_STAT_ERR,
 896                                 &lp->tx_dma_regs->dmasm);
 897         writel(readl(&lp->rx_dma_regs->dmasm) |
 898                                 DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR,
 899                                 &lp->rx_dma_regs->dmasm);
 900
 901         korina_free_ring(dev);
 902
 903         napi_disable(&lp->napi);
 904
 905         ret = korina_init(dev);
 906         if (ret < 0) {
 907                 printk(KERN_ERR DRV_NAME "%s: cannot restart device\n",
 908                                                                 dev->name);
 909                 return ret;
 910         }
 911         korina_multicast_list(dev);
 912
 913         enable_irq(lp->und_irq);
 914         enable_irq(lp->ovr_irq);
 915         enable_irq(lp->tx_irq);
 916         enable_irq(lp->rx_irq);
 917
 918         return ret;
 919 }
 920
 921 static void korina_clear_and_restart(struct net_device *dev, u32 value)
 922 {
 923         struct korina_private *lp = netdev_priv(dev);
 924
 925         netif_stop_queue(dev);
 926         writel(value, &lp->eth_regs->ethintfc);
 927         korina_restart(dev);
 928 }
 929
 930 /* Ethernet Tx Underflow interrupt */
 931 static irqreturn_t korina_und_interrupt(int irq, void *dev_id)
 932 {
 933         struct net_device *dev = dev_id;
 934         struct korina_private *lp = netdev_priv(dev);
 935         unsigned int und;
 936
 937         spin_lock(&lp->lock);
 938
 939         und = readl(&lp->eth_regs->ethintfc);
 940
 941         if (und & ETH_INT_FC_UND)
 942                 korina_clear_and_restart(dev, und & ~ETH_INT_FC_UND);
 943
 944         spin_unlock(&lp->lock);
 945
 946         return IRQ_HANDLED;
 947 }
 948
 949 static void korina_tx_timeout(struct net_device *dev)
 950 {
 951         struct korina_private *lp = netdev_priv(dev);
 952         unsigned long flags;
 953
 954         spin_lock_irqsave(&lp->lock, flags);
 955         korina_restart(dev);
 956         spin_unlock_irqrestore(&lp->lock, flags);
 957 }
 958
 959 /* Ethernet Rx Overflow interrupt */
 960 static irqreturn_t
 961 korina_ovr_interrupt(int irq, void *dev_id)
 962 {
 963         struct net_device *dev = dev_id;
 964         struct korina_private *lp = netdev_priv(dev);
 965         unsigned int ovr;
 966
 967         spin_lock(&lp->lock);
 968         ovr = readl(&lp->eth_regs->ethintfc);
 969
 970         if (ovr & ETH_INT_FC_OVR)
 971                 korina_clear_and_restart(dev, ovr & ~ETH_INT_FC_OVR);
 972
 973         spin_unlock(&lp->lock);
 974
 975         return IRQ_HANDLED;
 976 }
 977
 978 #ifdef CONFIG_NET_POLL_CONTROLLER
 979 static void korina_poll_controller(struct net_device *dev)
 980 {
 981         disable_irq(dev->irq);
 982         korina_tx_dma_interrupt(dev->irq, dev);
 983         enable_irq(dev->irq);
 984 }
 985 #endif
 986
 987 static int korina_open(struct net_device *dev)
 988 {
 989         struct korina_private *lp = netdev_priv(dev);
 990         int ret;
 991
 992         /* Initialize */
 993         ret = korina_init(dev);
 994         if (ret < 0) {
 995                 printk(KERN_ERR DRV_NAME "%s: cannot open device\n", dev->name);
 996                 goto out;
 997         }
 998
 999         /* Install the interrupt handler
1000          * that handles the Done Finished
1001          * Ovr and Und Events */
1002         ret = request_irq(lp->rx_irq, &korina_rx_dma_interrupt,
1003                         IRQF_DISABLED, "Korina ethernet Rx", dev);
1004         if (ret < 0) {
1005                 printk(KERN_ERR DRV_NAME "%s: unable to get Rx DMA IRQ %d\n",
1006                     dev->name, lp->rx_irq);
1007                 goto err_release;
1008         }
1009         ret = request_irq(lp->tx_irq, &korina_tx_dma_interrupt,
1010                         IRQF_DISABLED, "Korina ethernet Tx", dev);
1011         if (ret < 0) {
1012                 printk(KERN_ERR DRV_NAME "%s: unable to get Tx DMA IRQ %d\n",
1013                     dev->name, lp->tx_irq);
1014                 goto err_free_rx_irq;
1015         }
1016
1017         /* Install handler for overrun error. */
1018         ret = request_irq(lp->ovr_irq, &korina_ovr_interrupt,
1019                         IRQF_DISABLED, "Ethernet Overflow", dev);
1020         if (ret < 0) {
1021                 printk(KERN_ERR DRV_NAME"%s: unable to get OVR IRQ %d\n",
1022                     dev->name, lp->ovr_irq);
1023                 goto err_free_tx_irq;
1024         }
1025
1026         /* Install handler for underflow error. */
1027         ret = request_irq(lp->und_irq, &korina_und_interrupt,
1028                         IRQF_DISABLED, "Ethernet Underflow", dev);
1029         if (ret < 0) {
1030                 printk(KERN_ERR DRV_NAME "%s: unable to get UND IRQ %d\n",
1031                     dev->name, lp->und_irq);
1032                 goto err_free_ovr_irq;
1033         }
1034 out:
1035         return ret;
1036
1037 err_free_ovr_irq:
1038         free_irq(lp->ovr_irq, dev);
1039 err_free_tx_irq:
1040         free_irq(lp->tx_irq, dev);
1041 err_free_rx_irq:
1042         free_irq(lp->rx_irq, dev);
1043 err_release:
1044         korina_free_ring(dev);
1045         goto out;
1046 }
1047
1048 static int korina_close(struct net_device *dev)
1049 {
1050         struct korina_private *lp = netdev_priv(dev);
1051         u32 tmp;
1052
1053         /* Disable interrupts */
1054         disable_irq(lp->rx_irq);
1055         disable_irq(lp->tx_irq);
1056         disable_irq(lp->ovr_irq);
1057         disable_irq(lp->und_irq);
1058
1059         korina_abort_tx(dev);
1060         tmp = readl(&lp->tx_dma_regs->dmasm);
1061         tmp = tmp | DMA_STAT_FINI | DMA_STAT_ERR;
1062         writel(tmp, &lp->tx_dma_regs->dmasm);
1063
1064         korina_abort_rx(dev);
1065         tmp = readl(&lp->rx_dma_regs->dmasm);
1066         tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR;
1067         writel(tmp, &lp->rx_dma_regs->dmasm);
1068
1069         korina_free_ring(dev);
1070
1071         napi_disable(&lp->napi);
1072
1073         free_irq(lp->rx_irq, dev);
1074         free_irq(lp->tx_irq, dev);
1075         free_irq(lp->ovr_irq, dev);
1076         free_irq(lp->und_irq, dev);
1077
1078         return 0;
1079 }
1080
1081 static int korina_probe(struct platform_device *pdev)
1082 {
1083         struct korina_device *bif = platform_get_drvdata(pdev);
1084         struct korina_private *lp;
1085         struct net_device *dev;
1086         struct resource *r;
1087         int rc;
1088
1089         dev = alloc_etherdev(sizeof(struct korina_private));
1090         if (!dev) {
1091                 printk(KERN_ERR DRV_NAME ": alloc_etherdev failed\n");
1092                 return -ENOMEM;
1093         }
1094         SET_NETDEV_DEV(dev, &pdev->dev);
1095         lp = netdev_priv(dev);
1096
1097         bif->dev = dev;
1098         memcpy(dev->dev_addr, bif->mac, 6);
1099
1100         lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
1101         lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
1102         lp->ovr_irq = platform_get_irq_byname(pdev, "korina_ovr");
1103         lp->und_irq = platform_get_irq_byname(pdev, "korina_und");
1104
1105         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_regs");
1106         dev->base_addr = r->start;
1107         lp->eth_regs = ioremap_nocache(r->start, r->end - r->start);
1108         if (!lp->eth_regs) {
1109                 printk(KERN_ERR DRV_NAME "cannot remap registers\n");
1110                 rc = -ENXIO;
1111                 goto probe_err_out;
1112         }
1113
1114         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_rx");
1115         lp->rx_dma_regs = ioremap_nocache(r->start, r->end - r->start);
1116         if (!lp->rx_dma_regs) {
1117                 printk(KERN_ERR DRV_NAME "cannot remap Rx DMA registers\n");
1118                 rc = -ENXIO;
1119                 goto probe_err_dma_rx;
1120         }
1121
1122         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_tx");
1123         lp->tx_dma_regs = ioremap_nocache(r->start, r->end - r->start);
1124         if (!lp->tx_dma_regs) {
1125                 printk(KERN_ERR DRV_NAME "cannot remap Tx DMA registers\n");
1126                 rc = -ENXIO;
1127                 goto probe_err_dma_tx;
1128         }
1129
1130         lp->td_ring = kmalloc(TD_RING_SIZE + RD_RING_SIZE, GFP_KERNEL);
1131         if (!lp->td_ring) {
1132                 printk(KERN_ERR DRV_NAME "cannot allocate descriptors\n");
1133                 rc = -ENXIO;
1134                 goto probe_err_td_ring;
1135         }
1136
1137         dma_cache_inv((unsigned long)(lp->td_ring),
1138                         TD_RING_SIZE + RD_RING_SIZE);
1139
1140         /* now convert TD_RING pointer to KSEG1 */
1141         lp->td_ring = (struct dma_desc *)KSEG1ADDR(lp->td_ring);
1142         lp->rd_ring = &lp->td_ring[KORINA_NUM_TDS];
1143
1144         spin_lock_init(&lp->lock);
1145         /* just use the rx dma irq */
1146         dev->irq = lp->rx_irq;
1147         lp->dev = dev;
1148
1149         dev->open = korina_open;
1150         dev->stop = korina_close;
1151         dev->hard_start_xmit = korina_send_packet;
1152         dev->set_multicast_list = &korina_multicast_list;
1153         dev->ethtool_ops = &netdev_ethtool_ops;
1154         dev->tx_timeout = korina_tx_timeout;
1155         dev->watchdog_timeo = TX_TIMEOUT;
1156         dev->do_ioctl = &korina_ioctl;
1157 #ifdef CONFIG_NET_POLL_CONTROLLER
1158         dev->poll_controller = korina_poll_controller;
1159 #endif
1160         netif_napi_add(dev, &lp->napi, korina_poll, 64);
1161
1162         lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
1163         lp->mii_if.dev = dev;
1164         lp->mii_if.mdio_read = mdio_read;
1165         lp->mii_if.mdio_write = mdio_write;
1166         lp->mii_if.phy_id = lp->phy_addr;
1167         lp->mii_if.phy_id_mask = 0x1f;
1168         lp->mii_if.reg_num_mask = 0x1f;
1169
1170         rc = register_netdev(dev);
1171         if (rc < 0) {
1172                 printk(KERN_ERR DRV_NAME
1173                         ": cannot register net device %d\n", rc);
1174                 goto probe_err_register;
1175         }
1176 out:
1177         return rc;
1178
1179 probe_err_register:
1180         kfree(lp->td_ring);
1181 probe_err_td_ring:
1182         iounmap(lp->tx_dma_regs);
1183 probe_err_dma_tx:
1184         iounmap(lp->rx_dma_regs);
1185 probe_err_dma_rx:
1186         iounmap(lp->eth_regs);
1187 probe_err_out:
1188         free_netdev(dev);
1189         goto out;
1190 }
1191
1192 static int korina_remove(struct platform_device *pdev)
1193 {
1194         struct korina_device *bif = platform_get_drvdata(pdev);
1195         struct korina_private *lp = netdev_priv(bif->dev);
1196
1197         iounmap(lp->eth_regs);
1198         iounmap(lp->rx_dma_regs);
1199         iounmap(lp->tx_dma_regs);
1200
1201         platform_set_drvdata(pdev, NULL);
1202         unregister_netdev(bif->dev);
1203         free_netdev(bif->dev);
1204
1205         return 0;
1206 }
1207
1208 static struct platform_driver korina_driver = {
1209         .driver.name = "korina",
1210         .probe = korina_probe,
1211         .remove = korina_remove,
1212 };
1213
1214 static int __init korina_init_module(void)
1215 {
1216         return platform_driver_register(&korina_driver);
1217 }
1218
1219 static void korina_cleanup_module(void)
1220 {
1221         return platform_driver_unregister(&korina_driver);
1222 }
1223
1224 module_init(korina_init_module);
1225 module_exit(korina_cleanup_module);
1226
1227 MODULE_AUTHOR("Philip Rischel <rischelp@idt.com>");
1228 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
1229 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
1230 MODULE_DESCRIPTION("IDT RC32434 (Korina) Ethernet driver");
1231 MODULE_LICENSE("GPL");