drivers/net/enc28j60.c

   1 /*
   2  * Microchip ENC28J60 ethernet driver (MAC + PHY)
   3  *
   4  * Copyright (C) 2007 Eurek srl
   5  * Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
   6  * based on enc28j60.c written by David Anders for 2.4 kernel version
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * $Id: enc28j60.c,v 1.22 2007/12/20 10:47:01 claudio Exp $
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/fcntl.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/string.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/tcp.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/delay.h>
  30 #include <linux/spi/spi.h>
  31
  32 #include "enc28j60_hw.h"
  33
  34 #define DRV_NAME        "enc28j60"
  35 #define DRV_VERSION     "1.01"
  36
  37 #define SPI_OPLEN       1
  38
  39 #define ENC28J60_MSG_DEFAULT    \
  40         (NETIF_MSG_PROBE | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN | NETIF_MSG_LINK)
  41
  42 /* Buffer size required for the largest SPI transfer (i.e., reading a
  43  * frame). */
  44 #define SPI_TRANSFER_BUF_LEN    (4 + MAX_FRAMELEN)
  45
  46 #define TX_TIMEOUT      (4 * HZ)
  47
  48 /* Max TX retries in case of collision as suggested by errata datasheet */
  49 #define MAX_TX_RETRYCOUNT       16
  50
  51 enum {
  52         RXFILTER_NORMAL,
  53         RXFILTER_MULTI,
  54         RXFILTER_PROMISC
  55 };
  56
  57 /* Driver local data */
  58 struct enc28j60_net {
  59         struct net_device *netdev;
  60         struct spi_device *spi;
  61         struct mutex lock;
  62         struct sk_buff *tx_skb;
  63         struct work_struct tx_work;
  64         struct work_struct irq_work;
  65         struct work_struct setrx_work;
  66         struct work_struct restart_work;
  67         u8 bank;                /* current register bank selected */
  68         u16 next_pk_ptr;        /* next packet pointer within FIFO */
  69         u16 max_pk_counter;     /* statistics: max packet counter */
  70         u16 tx_retry_count;
  71         bool hw_enable;
  72         bool full_duplex;
  73         int rxfilter;
  74         u32 msg_enable;
  75         u8 spi_transfer_buf[SPI_TRANSFER_BUF_LEN];
  76 };
  77
  78 /* use ethtool to change the level for any given device */
  79 static struct {
  80         u32 msg_enable;
  81 } debug = { -1 };
  82
  83 /*
  84  * SPI read buffer
  85  * wait for the SPI transfer and copy received data to destination
  86  */
  87 static int
  88 spi_read_buf(struct enc28j60_net *priv, int len, u8 *data)
  89 {
  90         u8 *rx_buf = priv->spi_transfer_buf + 4;
  91         u8 *tx_buf = priv->spi_transfer_buf;
  92         struct spi_transfer t = {
  93                 .tx_buf = tx_buf,
  94                 .rx_buf = rx_buf,
  95                 .len = SPI_OPLEN + len,
  96         };
  97         struct spi_message msg;
  98         int ret;
  99
 100         tx_buf[0] = ENC28J60_READ_BUF_MEM;
 101         tx_buf[1] = tx_buf[2] = tx_buf[3] = 0;  /* don't care */
 102
 103         spi_message_init(&msg);
 104         spi_message_add_tail(&t, &msg);
 105         ret = spi_sync(priv->spi, &msg);
 106         if (ret == 0) {
 107                 memcpy(data, &rx_buf[SPI_OPLEN], len);
 108                 ret = msg.status;
 109         }
 110         if (ret && netif_msg_drv(priv))
 111                 printk(KERN_DEBUG DRV_NAME ": %s() failed: ret = %d\n",
 112                         __func__, ret);
 113
 114         return ret;
 115 }
 116
 117 /*
 118  * SPI write buffer
 119  */
 120 static int spi_write_buf(struct enc28j60_net *priv, int len,
 121                          const u8 *data)
 122 {
 123         int ret;
 124
 125         if (len > SPI_TRANSFER_BUF_LEN - 1 || len <= 0)
 126                 ret = -EINVAL;
 127         else {
 128                 priv->spi_transfer_buf[0] = ENC28J60_WRITE_BUF_MEM;
 129                 memcpy(&priv->spi_transfer_buf[1], data, len);
 130                 ret = spi_write(priv->spi, priv->spi_transfer_buf, len + 1);
 131                 if (ret && netif_msg_drv(priv))
 132                         printk(KERN_DEBUG DRV_NAME ": %s() failed: ret = %d\n",
 133                                 __func__, ret);
 134         }
 135         return ret;
 136 }
 137
 138 /*
 139  * basic SPI read operation
 140  */
 141 static u8 spi_read_op(struct enc28j60_net *priv, u8 op,
 142                            u8 addr)
 143 {
 144         u8 tx_buf[2];
 145         u8 rx_buf[4];
 146         u8 val = 0;
 147         int ret;
 148         int slen = SPI_OPLEN;
 149
 150         /* do dummy read if needed */
 151         if (addr & SPRD_MASK)
 152                 slen++;
 153
 154         tx_buf[0] = op | (addr & ADDR_MASK);
 155         ret = spi_write_then_read(priv->spi, tx_buf, 1, rx_buf, slen);
 156         if (ret)
 157                 printk(KERN_DEBUG DRV_NAME ": %s() failed: ret = %d\n",
 158                         __func__, ret);
 159         else
 160                 val = rx_buf[slen - 1];
 161
 162         return val;
 163 }
 164
 165 /*
 166  * basic SPI write operation
 167  */
 168 static int spi_write_op(struct enc28j60_net *priv, u8 op,
 169                         u8 addr, u8 val)
 170 {
 171         int ret;
 172
 173         priv->spi_transfer_buf[0] = op | (addr & ADDR_MASK);
 174         priv->spi_transfer_buf[1] = val;
 175         ret = spi_write(priv->spi, priv->spi_transfer_buf, 2);
 176         if (ret && netif_msg_drv(priv))
 177                 printk(KERN_DEBUG DRV_NAME ": %s() failed: ret = %d\n",
 178                         __func__, ret);
 179         return ret;
 180 }
 181
 182 static void enc28j60_soft_reset(struct enc28j60_net *priv)
 183 {
 184         if (netif_msg_hw(priv))
 185                 printk(KERN_DEBUG DRV_NAME ": %s() enter\n", __func__);
 186
 187         spi_write_op(priv, ENC28J60_SOFT_RESET, 0, ENC28J60_SOFT_RESET);
 188         /* Errata workaround #1, CLKRDY check is unreliable,
 189          * delay at least 1 mS instead */
 190         udelay(2000);
 191 }
 192
 193 /*
 194  * select the current register bank if necessary
 195  */
 196 static void enc28j60_set_bank(struct enc28j60_net *priv, u8 addr)
 197 {
 198         u8 b = (addr & BANK_MASK) >> 5;
 199
 200         /* These registers (EIE, EIR, ESTAT, ECON2, ECON1)
 201          * are present in all banks, no need to switch bank
 202          */
 203         if (addr >= EIE && addr <= ECON1)
 204                 return;
 205
 206         /* Clear or set each bank selection bit as needed */
 207         if ((b & ECON1_BSEL0) != (priv->bank & ECON1_BSEL0)) {
 208                 if (b & ECON1_BSEL0)
 209                         spi_write_op(priv, ENC28J60_BIT_FIELD_SET, ECON1,
 210                                         ECON1_BSEL0);
 211                 else
 212                         spi_write_op(priv, ENC28J60_BIT_FIELD_CLR, ECON1,
 213                                         ECON1_BSEL0);
 214         }
 215         if ((b & ECON1_BSEL1) != (priv->bank & ECON1_BSEL1)) {
 216                 if (b & ECON1_BSEL1)
 217                         spi_write_op(priv, ENC28J60_BIT_FIELD_SET, ECON1,
 218                                         ECON1_BSEL1);
 219                 else
 220                         spi_write_op(priv, ENC28J60_BIT_FIELD_CLR, ECON1,
 221                                         ECON1_BSEL1);
 222         }
 223         priv->bank = b;
 224 }
 225
 226 /*
 227  * Register access routines through the SPI bus.
 228  * Every register access comes in two flavours:
 229  * - nolock_xxx: caller needs to invoke mutex_lock, usually to access
 230  *   atomically more than one register
 231  * - locked_xxx: caller doesn't need to invoke mutex_lock, single access
 232  *
 233  * Some registers can be accessed through the bit field clear and
 234  * bit field set to avoid a read modify write cycle.
 235  */
 236
 237 /*
 238  * Register bit field Set
 239  */
 240 static void nolock_reg_bfset(struct enc28j60_net *priv,
 241                                       u8 addr, u8 mask)
 242 {
 243         enc28j60_set_bank(priv, addr);
 244         spi_write_op(priv, ENC28J60_BIT_FIELD_SET, addr, mask);
 245 }
 246
 247 static void locked_reg_bfset(struct enc28j60_net *priv,
 248                                       u8 addr, u8 mask)
 249 {
 250         mutex_lock(&priv->lock);
 251         nolock_reg_bfset(priv, addr, mask);
 252         mutex_unlock(&priv->lock);
 253 }
 254
 255 /*
 256  * Register bit field Clear
 257  */
 258 static void nolock_reg_bfclr(struct enc28j60_net *priv,
 259                                       u8 addr, u8 mask)
 260 {
 261         enc28j60_set_bank(priv, addr);
 262         spi_write_op(priv, ENC28J60_BIT_FIELD_CLR, addr, mask);
 263 }
 264
 265 static void locked_reg_bfclr(struct enc28j60_net *priv,
 266                                       u8 addr, u8 mask)
 267 {
 268         mutex_lock(&priv->lock);
 269         nolock_reg_bfclr(priv, addr, mask);
 270         mutex_unlock(&priv->lock);
 271 }
 272
 273 /*
 274  * Register byte read
 275  */
 276 static int nolock_regb_read(struct enc28j60_net *priv,
 277                                      u8 address)
 278 {
 279         enc28j60_set_bank(priv, address);
 280         return spi_read_op(priv, ENC28J60_READ_CTRL_REG, address);
 281 }
 282
 283 static int locked_regb_read(struct enc28j60_net *priv,
 284                                      u8 address)
 285 {
 286         int ret;
 287
 288         mutex_lock(&priv->lock);
 289         ret = nolock_regb_read(priv, address);
 290         mutex_unlock(&priv->lock);
 291
 292         return ret;
 293 }
 294
 295 /*
 296  * Register word read
 297  */
 298 static int nolock_regw_read(struct enc28j60_net *priv,
 299                                      u8 address)
 300 {
 301         int rl, rh;
 302
 303         enc28j60_set_bank(priv, address);
 304         rl = spi_read_op(priv, ENC28J60_READ_CTRL_REG, address);
 305         rh = spi_read_op(priv, ENC28J60_READ_CTRL_REG, address + 1);
 306
 307         return (rh << 8) | rl;
 308 }
 309
 310 static int locked_regw_read(struct enc28j60_net *priv,
 311                                      u8 address)
 312 {
 313         int ret;
 314
 315         mutex_lock(&priv->lock);
 316         ret = nolock_regw_read(priv, address);
 317         mutex_unlock(&priv->lock);
 318
 319         return ret;
 320 }
 321
 322 /*
 323  * Register byte write
 324  */
 325 static void nolock_regb_write(struct enc28j60_net *priv,
 326                                        u8 address, u8 data)
 327 {
 328         enc28j60_set_bank(priv, address);
 329         spi_write_op(priv, ENC28J60_WRITE_CTRL_REG, address, data);
 330 }
 331
 332 static void locked_regb_write(struct enc28j60_net *priv,
 333                                        u8 address, u8 data)
 334 {
 335         mutex_lock(&priv->lock);
 336         nolock_regb_write(priv, address, data);
 337         mutex_unlock(&priv->lock);
 338 }
 339
 340 /*
 341  * Register word write
 342  */
 343 static void nolock_regw_write(struct enc28j60_net *priv,
 344                                        u8 address, u16 data)
 345 {
 346         enc28j60_set_bank(priv, address);
 347         spi_write_op(priv, ENC28J60_WRITE_CTRL_REG, address, (u8) data);
 348         spi_write_op(priv, ENC28J60_WRITE_CTRL_REG, address + 1,
 349                      (u8) (data >> 8));
 350 }
 351
 352 static void locked_regw_write(struct enc28j60_net *priv,
 353                                        u8 address, u16 data)
 354 {
 355         mutex_lock(&priv->lock);
 356         nolock_regw_write(priv, address, data);
 357         mutex_unlock(&priv->lock);
 358 }
 359
 360 /*
 361  * Buffer memory read
 362  * Select the starting address and execute a SPI buffer read
 363  */
 364 static void enc28j60_mem_read(struct enc28j60_net *priv,
 365                                      u16 addr, int len, u8 *data)
 366 {
 367         mutex_lock(&priv->lock);
 368         nolock_regw_write(priv, ERDPTL, addr);
 369 #ifdef CONFIG_ENC28J60_WRITEVERIFY
 370         if (netif_msg_drv(priv)) {
 371                 u16 reg;
 372                 reg = nolock_regw_read(priv, ERDPTL);
 373                 if (reg != addr)
 374                         printk(KERN_DEBUG DRV_NAME ": %s() error writing ERDPT "
 375                                 "(0x%04x - 0x%04x)\n", __func__, reg, addr);
 376         }
 377 #endif
 378         spi_read_buf(priv, len, data);
 379         mutex_unlock(&priv->lock);
 380 }
 381
 382 /*
 383  * Write packet to enc28j60 TX buffer memory
 384  */
 385 static void
 386 enc28j60_packet_write(struct enc28j60_net *priv, int len, const u8 *data)
 387 {
 388         mutex_lock(&priv->lock);
 389         /* Set the write pointer to start of transmit buffer area */
 390         nolock_regw_write(priv, EWRPTL, TXSTART_INIT);
 391 #ifdef CONFIG_ENC28J60_WRITEVERIFY
 392         if (netif_msg_drv(priv)) {
 393                 u16 reg;
 394                 reg = nolock_regw_read(priv, EWRPTL);
 395                 if (reg != TXSTART_INIT)
 396                         printk(KERN_DEBUG DRV_NAME
 397                                 ": %s() ERWPT:0x%04x != 0x%04x\n",
 398                                 __func__, reg, TXSTART_INIT);
 399         }
 400 #endif
 401         /* Set the TXND pointer to correspond to the packet size given */
 402         nolock_regw_write(priv, ETXNDL, TXSTART_INIT + len);
 403         /* write per-packet control byte */
 404         spi_write_op(priv, ENC28J60_WRITE_BUF_MEM, 0, 0x00);
 405         if (netif_msg_hw(priv))
 406                 printk(KERN_DEBUG DRV_NAME
 407                         ": %s() after control byte ERWPT:0x%04x\n",
 408                         __func__, nolock_regw_read(priv, EWRPTL));
 409         /* copy the packet into the transmit buffer */
 410         spi_write_buf(priv, len, data);
 411         if (netif_msg_hw(priv))
 412                 printk(KERN_DEBUG DRV_NAME
 413                          ": %s() after write packet ERWPT:0x%04x, len=%d\n",
 414                          __func__, nolock_regw_read(priv, EWRPTL), len);
 415         mutex_unlock(&priv->lock);
 416 }
 417
 418 static unsigned long msec20_to_jiffies;
 419
 420 static int poll_ready(struct enc28j60_net *priv, u8 reg, u8 mask, u8 val)
 421 {
 422         unsigned long timeout = jiffies + msec20_to_jiffies;
 423
 424         /* 20 msec timeout read */
 425         while ((nolock_regb_read(priv, reg) & mask) != val) {
 426                 if (time_after(jiffies, timeout)) {
 427                         if (netif_msg_drv(priv))
 428                                 dev_dbg(&priv->spi->dev,
 429                                         "reg %02x ready timeout!\n", reg);
 430                         return -ETIMEDOUT;
 431                 }
 432                 cpu_relax();
 433         }
 434         return 0;
 435 }
 436
 437 /*
 438  * Wait until the PHY operation is complete.
 439  */
 440 static int wait_phy_ready(struct enc28j60_net *priv)
 441 {
 442         return poll_ready(priv, MISTAT, MISTAT_BUSY, 0) ? 0 : 1;
 443 }
 444
 445 /*
 446  * PHY register read
 447  * PHY registers are not accessed directly, but through the MII
 448  */
 449 static u16 enc28j60_phy_read(struct enc28j60_net *priv, u8 address)
 450 {
 451         u16 ret;
 452
 453         mutex_lock(&priv->lock);
 454         /* set the PHY register address */
 455         nolock_regb_write(priv, MIREGADR, address);
 456         /* start the register read operation */
 457         nolock_regb_write(priv, MICMD, MICMD_MIIRD);
 458         /* wait until the PHY read completes */
 459         wait_phy_ready(priv);
 460         /* quit reading */
 461         nolock_regb_write(priv, MICMD, 0x00);
 462         /* return the data */
 463         ret  = nolock_regw_read(priv, MIRDL);
 464         mutex_unlock(&priv->lock);
 465
 466         return ret;
 467 }
 468
 469 static int enc28j60_phy_write(struct enc28j60_net *priv, u8 address, u16 data)
 470 {
 471         int ret;
 472
 473         mutex_lock(&priv->lock);
 474         /* set the PHY register address */
 475         nolock_regb_write(priv, MIREGADR, address);
 476         /* write the PHY data */
 477         nolock_regw_write(priv, MIWRL, data);
 478         /* wait until the PHY write completes and return */
 479         ret = wait_phy_ready(priv);
 480         mutex_unlock(&priv->lock);
 481
 482         return ret;
 483 }
 484
 485 /*
 486  * Program the hardware MAC address from dev->dev_addr.
 487  */
 488 static int enc28j60_set_hw_macaddr(struct net_device *ndev)
 489 {
 490         int ret;
 491         struct enc28j60_net *priv = netdev_priv(ndev);
 492
 493         mutex_lock(&priv->lock);
 494         if (!priv->hw_enable) {
 495                 if (netif_msg_drv(priv))
 496                         printk(KERN_INFO DRV_NAME
 497                                 ": %s: Setting MAC address to %pM\n",
 498                                 ndev->name, ndev->dev_addr);
 499                 /* NOTE: MAC address in ENC28J60 is byte-backward */
 500                 nolock_regb_write(priv, MAADR5, ndev->dev_addr[0]);
 501                 nolock_regb_write(priv, MAADR4, ndev->dev_addr[1]);
 502                 nolock_regb_write(priv, MAADR3, ndev->dev_addr[2]);
 503                 nolock_regb_write(priv, MAADR2, ndev->dev_addr[3]);
 504                 nolock_regb_write(priv, MAADR1, ndev->dev_addr[4]);
 505                 nolock_regb_write(priv, MAADR0, ndev->dev_addr[5]);
 506                 ret = 0;
 507         } else {
 508                 if (netif_msg_drv(priv))
 509                         printk(KERN_DEBUG DRV_NAME
 510                                 ": %s() Hardware must be disabled to set "
 511                                 "Mac address\n", __func__);
 512                 ret = -EBUSY;
 513         }
 514         mutex_unlock(&priv->lock);
 515         return ret;
 516 }
 517
 518 /*
 519  * Store the new hardware address in dev->dev_addr, and update the MAC.
 520  */
 521 static int enc28j60_set_mac_address(struct net_device *dev, void *addr)
 522 {
 523         struct sockaddr *address = addr;
 524
 525         if (netif_running(dev))
 526                 return -EBUSY;
 527         if (!is_valid_ether_addr(address->sa_data))
 528                 return -EADDRNOTAVAIL;
 529
 530         memcpy(dev->dev_addr, address->sa_data, dev->addr_len);
 531         return enc28j60_set_hw_macaddr(dev);
 532 }
 533
 534 /*
 535  * Debug routine to dump useful register contents
 536  */
 537 static void enc28j60_dump_regs(struct enc28j60_net *priv, const char *msg)
 538 {
 539         mutex_lock(&priv->lock);
 540         printk(KERN_DEBUG DRV_NAME " %s\n"
 541                 "HwRevID: 0x%02x\n"
 542                 "Cntrl: ECON1 ECON2 ESTAT  EIR  EIE\n"
 543                 "       0x%02x  0x%02x  0x%02x  0x%02x  0x%02x\n"
 544                 "MAC  : MACON1 MACON3 MACON4\n"
 545                 "       0x%02x   0x%02x   0x%02x\n"
 546                 "Rx   : ERXST  ERXND  ERXWRPT ERXRDPT ERXFCON EPKTCNT MAMXFL\n"
 547                 "       0x%04x 0x%04x 0x%04x  0x%04x  "
 548                 "0x%02x    0x%02x    0x%04x\n"
 549                 "Tx   : ETXST  ETXND  MACLCON1 MACLCON2 MAPHSUP\n"
 550                 "       0x%04x 0x%04x 0x%02x     0x%02x     0x%02x\n",
 551                 msg, nolock_regb_read(priv, EREVID),
 552                 nolock_regb_read(priv, ECON1), nolock_regb_read(priv, ECON2),
 553                 nolock_regb_read(priv, ESTAT), nolock_regb_read(priv, EIR),
 554                 nolock_regb_read(priv, EIE), nolock_regb_read(priv, MACON1),
 555                 nolock_regb_read(priv, MACON3), nolock_regb_read(priv, MACON4),
 556                 nolock_regw_read(priv, ERXSTL), nolock_regw_read(priv, ERXNDL),
 557                 nolock_regw_read(priv, ERXWRPTL),
 558                 nolock_regw_read(priv, ERXRDPTL),
 559                 nolock_regb_read(priv, ERXFCON),
 560                 nolock_regb_read(priv, EPKTCNT),
 561                 nolock_regw_read(priv, MAMXFLL), nolock_regw_read(priv, ETXSTL),
 562                 nolock_regw_read(priv, ETXNDL),
 563                 nolock_regb_read(priv, MACLCON1),
 564                 nolock_regb_read(priv, MACLCON2),
 565                 nolock_regb_read(priv, MAPHSUP));
 566         mutex_unlock(&priv->lock);
 567 }
 568
 569 /*
 570  * ERXRDPT need to be set always at odd addresses, refer to errata datasheet
 571  */
 572 static u16 erxrdpt_workaround(u16 next_packet_ptr, u16 start, u16 end)
 573 {
 574         u16 erxrdpt;
 575
 576         if ((next_packet_ptr - 1 < start) || (next_packet_ptr - 1 > end))
 577                 erxrdpt = end;
 578         else
 579                 erxrdpt = next_packet_ptr - 1;
 580
 581         return erxrdpt;
 582 }
 583
 584 /*
 585  * Calculate wrap around when reading beyond the end of the RX buffer
 586  */
 587 static u16 rx_packet_start(u16 ptr)
 588 {
 589         if (ptr + RSV_SIZE > RXEND_INIT)
 590                 return (ptr + RSV_SIZE) - (RXEND_INIT - RXSTART_INIT + 1);
 591         else
 592                 return ptr + RSV_SIZE;
 593 }
 594
 595 static void nolock_rxfifo_init(struct enc28j60_net *priv, u16 start, u16 end)
 596 {
 597         u16 erxrdpt;
 598
 599         if (start > 0x1FFF || end > 0x1FFF || start > end) {
 600                 if (netif_msg_drv(priv))
 601                         printk(KERN_ERR DRV_NAME ": %s(%d, %d) RXFIFO "
 602                                 "bad parameters!\n", __func__, start, end);
 603                 return;
 604         }
 605         /* set receive buffer start + end */
 606         priv->next_pk_ptr = start;
 607         nolock_regw_write(priv, ERXSTL, start);
 608         erxrdpt = erxrdpt_workaround(priv->next_pk_ptr, start, end);
 609         nolock_regw_write(priv, ERXRDPTL, erxrdpt);
 610         nolock_regw_write(priv, ERXNDL, end);
 611 }
 612
 613 static void nolock_txfifo_init(struct enc28j60_net *priv, u16 start, u16 end)
 614 {
 615         if (start > 0x1FFF || end > 0x1FFF || start > end) {
 616                 if (netif_msg_drv(priv))
 617                         printk(KERN_ERR DRV_NAME ": %s(%d, %d) TXFIFO "
 618                                 "bad parameters!\n", __func__, start, end);
 619                 return;
 620         }
 621         /* set transmit buffer start + end */
 622         nolock_regw_write(priv, ETXSTL, start);
 623         nolock_regw_write(priv, ETXNDL, end);
 624 }
 625
 626 /*
 627  * Low power mode shrinks power consumption about 100x, so we'd like
 628  * the chip to be in that mode whenever it's inactive.  (However, we
 629  * can't stay in lowpower mode during suspend with WOL active.)
 630  */
 631 static void enc28j60_lowpower(struct enc28j60_net *priv, bool is_low)
 632 {
 633         if (netif_msg_drv(priv))
 634                 dev_dbg(&priv->spi->dev, "%s power...\n",
 635                                 is_low ? "low" : "high");
 636
 637         mutex_lock(&priv->lock);
 638         if (is_low) {
 639                 nolock_reg_bfclr(priv, ECON1, ECON1_RXEN);
 640                 poll_ready(priv, ESTAT, ESTAT_RXBUSY, 0);
 641                 poll_ready(priv, ECON1, ECON1_TXRTS, 0);
 642                 /* ECON2_VRPS was set during initialization */
 643                 nolock_reg_bfset(priv, ECON2, ECON2_PWRSV);
 644         } else {
 645                 nolock_reg_bfclr(priv, ECON2, ECON2_PWRSV);
 646                 poll_ready(priv, ESTAT, ESTAT_CLKRDY, ESTAT_CLKRDY);
 647                 /* caller sets ECON1_RXEN */
 648         }
 649         mutex_unlock(&priv->lock);
 650 }
 651
 652 static int enc28j60_hw_init(struct enc28j60_net *priv)
 653 {
 654         u8 reg;
 655
 656         if (netif_msg_drv(priv))
 657                 printk(KERN_DEBUG DRV_NAME ": %s() - %s\n", __func__,
 658                         priv->full_duplex ? "FullDuplex" : "HalfDuplex");
 659
 660         mutex_lock(&priv->lock);
 661         /* first reset the chip */
 662         enc28j60_soft_reset(priv);
 663         /* Clear ECON1 */
 664         spi_write_op(priv, ENC28J60_WRITE_CTRL_REG, ECON1, 0x00);
 665         priv->bank = 0;
 666         priv->hw_enable = false;
 667         priv->tx_retry_count = 0;
 668         priv->max_pk_counter = 0;
 669         priv->rxfilter = RXFILTER_NORMAL;
 670         /* enable address auto increment and voltage regulator powersave */
 671         nolock_regb_write(priv, ECON2, ECON2_AUTOINC | ECON2_VRPS);
 672
 673         nolock_rxfifo_init(priv, RXSTART_INIT, RXEND_INIT);
 674         nolock_txfifo_init(priv, TXSTART_INIT, TXEND_INIT);
 675         mutex_unlock(&priv->lock);
 676
 677         /*
 678          * Check the RevID.
 679          * If it's 0x00 or 0xFF probably the enc28j60 is not mounted or
 680          * damaged
 681          */
 682         reg = locked_regb_read(priv, EREVID);
 683         if (netif_msg_drv(priv))
 684                 printk(KERN_INFO DRV_NAME ": chip RevID: 0x%02x\n", reg);
 685         if (reg == 0x00 || reg == 0xff) {
 686                 if (netif_msg_drv(priv))
 687                         printk(KERN_DEBUG DRV_NAME ": %s() Invalid RevId %d\n",
 688                                 __func__, reg);
 689                 return 0;
 690         }
 691
 692         /* default filter mode: (unicast OR broadcast) AND crc valid */
 693         locked_regb_write(priv, ERXFCON,
 694                             ERXFCON_UCEN | ERXFCON_CRCEN | ERXFCON_BCEN);
 695
 696         /* enable MAC receive */
 697         locked_regb_write(priv, MACON1,
 698                             MACON1_MARXEN | MACON1_TXPAUS | MACON1_RXPAUS);
 699         /* enable automatic padding and CRC operations */
 700         if (priv->full_duplex) {
 701                 locked_regb_write(priv, MACON3,
 702                                     MACON3_PADCFG0 | MACON3_TXCRCEN |
 703                                     MACON3_FRMLNEN | MACON3_FULDPX);
 704                 /* set inter-frame gap (non-back-to-back) */
 705                 locked_regb_write(priv, MAIPGL, 0x12);
 706                 /* set inter-frame gap (back-to-back) */
 707                 locked_regb_write(priv, MABBIPG, 0x15);
 708         } else {
 709                 locked_regb_write(priv, MACON3,
 710                                     MACON3_PADCFG0 | MACON3_TXCRCEN |
 711                                     MACON3_FRMLNEN);
 712                 locked_regb_write(priv, MACON4, 1 << 6);        /* DEFER bit */
 713                 /* set inter-frame gap (non-back-to-back) */
 714                 locked_regw_write(priv, MAIPGL, 0x0C12);
 715                 /* set inter-frame gap (back-to-back) */
 716                 locked_regb_write(priv, MABBIPG, 0x12);
 717         }
 718         /*
 719          * MACLCON1 (default)
 720          * MACLCON2 (default)
 721          * Set the maximum packet size which the controller will accept
 722          */
 723         locked_regw_write(priv, MAMXFLL, MAX_FRAMELEN);
 724
 725         /* Configure LEDs */
 726         if (!enc28j60_phy_write(priv, PHLCON, ENC28J60_LAMPS_MODE))
 727                 return 0;
 728
 729         if (priv->full_duplex) {
 730                 if (!enc28j60_phy_write(priv, PHCON1, PHCON1_PDPXMD))
 731                         return 0;
 732                 if (!enc28j60_phy_write(priv, PHCON2, 0x00))
 733                         return 0;
 734         } else {
 735                 if (!enc28j60_phy_write(priv, PHCON1, 0x00))
 736                         return 0;
 737                 if (!enc28j60_phy_write(priv, PHCON2, PHCON2_HDLDIS))
 738                         return 0;
 739         }
 740         if (netif_msg_hw(priv))
 741                 enc28j60_dump_regs(priv, "Hw initialized.");
 742
 743         return 1;
 744 }
 745
 746 static void enc28j60_hw_enable(struct enc28j60_net *priv)
 747 {
 748         /* enable interrupts */
 749         if (netif_msg_hw(priv))
 750                 printk(KERN_DEBUG DRV_NAME ": %s() enabling interrupts.\n",
 751                         __func__);
 752
 753         enc28j60_phy_write(priv, PHIE, PHIE_PGEIE | PHIE_PLNKIE);
 754
 755         mutex_lock(&priv->lock);
 756         nolock_reg_bfclr(priv, EIR, EIR_DMAIF | EIR_LINKIF |
 757                          EIR_TXIF | EIR_TXERIF | EIR_RXERIF | EIR_PKTIF);
 758         nolock_regb_write(priv, EIE, EIE_INTIE | EIE_PKTIE | EIE_LINKIE |
 759                           EIE_TXIE | EIE_TXERIE | EIE_RXERIE);
 760
 761         /* enable receive logic */
 762         nolock_reg_bfset(priv, ECON1, ECON1_RXEN);
 763         priv->hw_enable = true;
 764         mutex_unlock(&priv->lock);
 765 }
 766
 767 static void enc28j60_hw_disable(struct enc28j60_net *priv)
 768 {
 769         mutex_lock(&priv->lock);
 770         /* disable interrutps and packet reception */
 771         nolock_regb_write(priv, EIE, 0x00);
 772         nolock_reg_bfclr(priv, ECON1, ECON1_RXEN);
 773         priv->hw_enable = false;
 774         mutex_unlock(&priv->lock);
 775 }
 776
 777 static int
 778 enc28j60_setlink(struct net_device *ndev, u8 autoneg, u16 speed, u8 duplex)
 779 {
 780         struct enc28j60_net *priv = netdev_priv(ndev);
 781         int ret = 0;
 782
 783         if (!priv->hw_enable) {
 784                 /* link is in low power mode now; duplex setting
 785                  * will take effect on next enc28j60_hw_init().
 786                  */
 787                 if (autoneg == AUTONEG_DISABLE && speed == SPEED_10)
 788                         priv->full_duplex = (duplex == DUPLEX_FULL);
 789                 else {
 790                         if (netif_msg_link(priv))
 791                                 dev_warn(&ndev->dev,
 792                                         "unsupported link setting\n");
 793                         ret = -EOPNOTSUPP;
 794                 }
 795         } else {
 796                 if (netif_msg_link(priv))
 797                         dev_warn(&ndev->dev, "Warning: hw must be disabled "
 798                                 "to set link mode\n");
 799                 ret = -EBUSY;
 800         }
 801         return ret;
 802 }
 803
 804 /*
 805  * Read the Transmit Status Vector
 806  */
 807 static void enc28j60_read_tsv(struct enc28j60_net *priv, u8 tsv[TSV_SIZE])
 808 {
 809         int endptr;
 810
 811         endptr = locked_regw_read(priv, ETXNDL);
 812         if (netif_msg_hw(priv))
 813                 printk(KERN_DEBUG DRV_NAME ": reading TSV at addr:0x%04x\n",
 814                          endptr + 1);
 815         enc28j60_mem_read(priv, endptr + 1, TSV_SIZE, tsv);
 816 }
 817
 818 static void enc28j60_dump_tsv(struct enc28j60_net *priv, const char *msg,
 819                                 u8 tsv[TSV_SIZE])
 820 {
 821         u16 tmp1, tmp2;
 822
 823         printk(KERN_DEBUG DRV_NAME ": %s - TSV:\n", msg);
 824         tmp1 = tsv[1];
 825         tmp1 <<= 8;
 826         tmp1 |= tsv[0];
 827
 828         tmp2 = tsv[5];
 829         tmp2 <<= 8;
 830         tmp2 |= tsv[4];
 831
 832         printk(KERN_DEBUG DRV_NAME ": ByteCount: %d, CollisionCount: %d,"
 833                 " TotByteOnWire: %d\n", tmp1, tsv[2] & 0x0f, tmp2);
 834         printk(KERN_DEBUG DRV_NAME ": TxDone: %d, CRCErr:%d, LenChkErr: %d,"
 835                 " LenOutOfRange: %d\n", TSV_GETBIT(tsv, TSV_TXDONE),
 836                 TSV_GETBIT(tsv, TSV_TXCRCERROR),
 837                 TSV_GETBIT(tsv, TSV_TXLENCHKERROR),
 838                 TSV_GETBIT(tsv, TSV_TXLENOUTOFRANGE));
 839         printk(KERN_DEBUG DRV_NAME ": Multicast: %d, Broadcast: %d, "
 840                 "PacketDefer: %d, ExDefer: %d\n",
 841                 TSV_GETBIT(tsv, TSV_TXMULTICAST),
 842                 TSV_GETBIT(tsv, TSV_TXBROADCAST),
 843                 TSV_GETBIT(tsv, TSV_TXPACKETDEFER),
 844                 TSV_GETBIT(tsv, TSV_TXEXDEFER));
 845         printk(KERN_DEBUG DRV_NAME ": ExCollision: %d, LateCollision: %d, "
 846                  "Giant: %d, Underrun: %d\n",
 847                  TSV_GETBIT(tsv, TSV_TXEXCOLLISION),
 848                  TSV_GETBIT(tsv, TSV_TXLATECOLLISION),
 849                  TSV_GETBIT(tsv, TSV_TXGIANT), TSV_GETBIT(tsv, TSV_TXUNDERRUN));
 850         printk(KERN_DEBUG DRV_NAME ": ControlFrame: %d, PauseFrame: %d, "
 851                  "BackPressApp: %d, VLanTagFrame: %d\n",
 852                  TSV_GETBIT(tsv, TSV_TXCONTROLFRAME),
 853                  TSV_GETBIT(tsv, TSV_TXPAUSEFRAME),
 854                  TSV_GETBIT(tsv, TSV_BACKPRESSUREAPP),
 855                  TSV_GETBIT(tsv, TSV_TXVLANTAGFRAME));
 856 }
 857
 858 /*
 859  * Receive Status vector
 860  */
 861 static void enc28j60_dump_rsv(struct enc28j60_net *priv, const char *msg,
 862                               u16 pk_ptr, int len, u16 sts)
 863 {
 864         printk(KERN_DEBUG DRV_NAME ": %s - NextPk: 0x%04x - RSV:\n",
 865                 msg, pk_ptr);
 866         printk(KERN_DEBUG DRV_NAME ": ByteCount: %d, DribbleNibble: %d\n", len,
 867                  RSV_GETBIT(sts, RSV_DRIBBLENIBBLE));
 868         printk(KERN_DEBUG DRV_NAME ": RxOK: %d, CRCErr:%d, LenChkErr: %d,"
 869                  " LenOutOfRange: %d\n", RSV_GETBIT(sts, RSV_RXOK),
 870                  RSV_GETBIT(sts, RSV_CRCERROR),
 871                  RSV_GETBIT(sts, RSV_LENCHECKERR),
 872                  RSV_GETBIT(sts, RSV_LENOUTOFRANGE));
 873         printk(KERN_DEBUG DRV_NAME ": Multicast: %d, Broadcast: %d, "
 874                  "LongDropEvent: %d, CarrierEvent: %d\n",
 875                  RSV_GETBIT(sts, RSV_RXMULTICAST),
 876                  RSV_GETBIT(sts, RSV_RXBROADCAST),
 877                  RSV_GETBIT(sts, RSV_RXLONGEVDROPEV),
 878                  RSV_GETBIT(sts, RSV_CARRIEREV));
 879         printk(KERN_DEBUG DRV_NAME ": ControlFrame: %d, PauseFrame: %d,"
 880                  " UnknownOp: %d, VLanTagFrame: %d\n",
 881                  RSV_GETBIT(sts, RSV_RXCONTROLFRAME),
 882                  RSV_GETBIT(sts, RSV_RXPAUSEFRAME),
 883                  RSV_GETBIT(sts, RSV_RXUNKNOWNOPCODE),
 884                  RSV_GETBIT(sts, RSV_RXTYPEVLAN));
 885 }
 886
 887 static void dump_packet(const char *msg, int len, const char *data)
 888 {
 889         printk(KERN_DEBUG DRV_NAME ": %s - packet len:%d\n", msg, len);
 890         print_hex_dump(KERN_DEBUG, "pk data: ", DUMP_PREFIX_OFFSET, 16, 1,
 891                         data, len, true);
 892 }
 893
 894 /*
 895  * Hardware receive function.
 896  * Read the buffer memory, update the FIFO pointer to free the buffer,
 897  * check the status vector and decrement the packet counter.
 898  */
 899 static void enc28j60_hw_rx(struct net_device *ndev)
 900 {
 901         struct enc28j60_net *priv = netdev_priv(ndev);
 902         struct sk_buff *skb = NULL;
 903         u16 erxrdpt, next_packet, rxstat;
 904         u8 rsv[RSV_SIZE];
 905         int len;
 906
 907         if (netif_msg_rx_status(priv))
 908                 printk(KERN_DEBUG DRV_NAME ": RX pk_addr:0x%04x\n",
 909                         priv->next_pk_ptr);
 910
 911         if (unlikely(priv->next_pk_ptr > RXEND_INIT)) {
 912                 if (netif_msg_rx_err(priv))
 913                         dev_err(&ndev->dev,
 914                                 "%s() Invalid packet address!! 0x%04x\n",
 915                                 __func__, priv->next_pk_ptr);
 916                 /* packet address corrupted: reset RX logic */
 917                 mutex_lock(&priv->lock);
 918                 nolock_reg_bfclr(priv, ECON1, ECON1_RXEN);
 919                 nolock_reg_bfset(priv, ECON1, ECON1_RXRST);
 920                 nolock_reg_bfclr(priv, ECON1, ECON1_RXRST);
 921                 nolock_rxfifo_init(priv, RXSTART_INIT, RXEND_INIT);
 922                 nolock_reg_bfclr(priv, EIR, EIR_RXERIF);
 923                 nolock_reg_bfset(priv, ECON1, ECON1_RXEN);
 924                 mutex_unlock(&priv->lock);
 925                 ndev->stats.rx_errors++;
 926                 return;
 927         }
 928         /* Read next packet pointer and rx status vector */
 929         enc28j60_mem_read(priv, priv->next_pk_ptr, sizeof(rsv), rsv);
 930
 931         next_packet = rsv[1];
 932         next_packet <<= 8;
 933         next_packet |= rsv[0];
 934
 935         len = rsv[3];
 936         len <<= 8;
 937         len |= rsv[2];
 938
 939         rxstat = rsv[5];
 940         rxstat <<= 8;
 941         rxstat |= rsv[4];
 942
 943         if (netif_msg_rx_status(priv))
 944                 enc28j60_dump_rsv(priv, __func__, next_packet, len, rxstat);
 945
 946         if (!RSV_GETBIT(rxstat, RSV_RXOK) || len > MAX_FRAMELEN) {
 947                 if (netif_msg_rx_err(priv))
 948                         dev_err(&ndev->dev, "Rx Error (%04x)\n", rxstat);
 949                 ndev->stats.rx_errors++;
 950                 if (RSV_GETBIT(rxstat, RSV_CRCERROR))
 951                         ndev->stats.rx_crc_errors++;
 952                 if (RSV_GETBIT(rxstat, RSV_LENCHECKERR))
 953                         ndev->stats.rx_frame_errors++;
 954                 if (len > MAX_FRAMELEN)
 955                         ndev->stats.rx_over_errors++;
 956         } else {
 957                 skb = dev_alloc_skb(len + NET_IP_ALIGN);
 958                 if (!skb) {
 959                         if (netif_msg_rx_err(priv))
 960                                 dev_err(&ndev->dev,
 961                                         "out of memory for Rx'd frame\n");
 962                         ndev->stats.rx_dropped++;
 963                 } else {
 964                         skb->dev = ndev;
 965                         skb_reserve(skb, NET_IP_ALIGN);
 966                         /* copy the packet from the receive buffer */
 967                         enc28j60_mem_read(priv,
 968                                 rx_packet_start(priv->next_pk_ptr),
 969                                 len, skb_put(skb, len));
 970                         if (netif_msg_pktdata(priv))
 971                                 dump_packet(__func__, skb->len, skb->data);
 972                         skb->protocol = eth_type_trans(skb, ndev);
 973                         /* update statistics */
 974                         ndev->stats.rx_packets++;
 975                         ndev->stats.rx_bytes += len;
 976                         netif_rx_ni(skb);
 977                 }
 978         }
 979         /*
 980          * Move the RX read pointer to the start of the next
 981          * received packet.
 982          * This frees the memory we just read out
 983          */
 984         erxrdpt = erxrdpt_workaround(next_packet, RXSTART_INIT, RXEND_INIT);
 985         if (netif_msg_hw(priv))
 986                 printk(KERN_DEBUG DRV_NAME ": %s() ERXRDPT:0x%04x\n",
 987                         __func__, erxrdpt);
 988
 989         mutex_lock(&priv->lock);
 990         nolock_regw_write(priv, ERXRDPTL, erxrdpt);
 991 #ifdef CONFIG_ENC28J60_WRITEVERIFY
 992         if (netif_msg_drv(priv)) {
 993                 u16 reg;
 994                 reg = nolock_regw_read(priv, ERXRDPTL);
 995                 if (reg != erxrdpt)
 996                         printk(KERN_DEBUG DRV_NAME ": %s() ERXRDPT verify "
 997                                 "error (0x%04x - 0x%04x)\n", __func__,
 998                                 reg, erxrdpt);
 999         }
1000 #endif
1001         priv->next_pk_ptr = next_packet;
1002         /* we are done with this packet, decrement the packet counter */
1003         nolock_reg_bfset(priv, ECON2, ECON2_PKTDEC);
1004         mutex_unlock(&priv->lock);
1005 }
1006
1007 /*
1008  * Calculate free space in RxFIFO
1009  */
1010 static int enc28j60_get_free_rxfifo(struct enc28j60_net *priv)
1011 {
1012         int epkcnt, erxst, erxnd, erxwr, erxrd;
1013         int free_space;
1014
1015         mutex_lock(&priv->lock);
1016         epkcnt = nolock_regb_read(priv, EPKTCNT);
1017         if (epkcnt >= 255)
1018                 free_space = -1;
1019         else {
1020                 erxst = nolock_regw_read(priv, ERXSTL);
1021                 erxnd = nolock_regw_read(priv, ERXNDL);
1022                 erxwr = nolock_regw_read(priv, ERXWRPTL);
1023                 erxrd = nolock_regw_read(priv, ERXRDPTL);
1024
1025                 if (erxwr > erxrd)
1026                         free_space = (erxnd - erxst) - (erxwr - erxrd);
1027                 else if (erxwr == erxrd)
1028                         free_space = (erxnd - erxst);
1029                 else
1030                         free_space = erxrd - erxwr - 1;
1031         }
1032         mutex_unlock(&priv->lock);
1033         if (netif_msg_rx_status(priv))
1034                 printk(KERN_DEBUG DRV_NAME ": %s() free_space = %d\n",
1035                         __func__, free_space);
1036         return free_space;
1037 }
1038
1039 /*
1040  * Access the PHY to determine link status
1041  */
1042 static void enc28j60_check_link_status(struct net_device *ndev)
1043 {
1044         struct enc28j60_net *priv = netdev_priv(ndev);
1045         u16 reg;
1046         int duplex;
1047
1048         reg = enc28j60_phy_read(priv, PHSTAT2);
1049         if (netif_msg_hw(priv))
1050                 printk(KERN_DEBUG DRV_NAME ": %s() PHSTAT1: %04x, "
1051                         "PHSTAT2: %04x\n", __func__,
1052                         enc28j60_phy_read(priv, PHSTAT1), reg);
1053         duplex = reg & PHSTAT2_DPXSTAT;
1054
1055         if (reg & PHSTAT2_LSTAT) {
1056                 netif_carrier_on(ndev);
1057                 if (netif_msg_ifup(priv))
1058                         dev_info(&ndev->dev, "link up - %s\n",
1059                                 duplex ? "Full duplex" : "Half duplex");
1060         } else {
1061                 if (netif_msg_ifdown(priv))
1062                         dev_info(&ndev->dev, "link down\n");
1063                 netif_carrier_off(ndev);
1064         }
1065 }
1066
1067 static void enc28j60_tx_clear(struct net_device *ndev, bool err)
1068 {
1069         struct enc28j60_net *priv = netdev_priv(ndev);
1070
1071         if (err)
1072                 ndev->stats.tx_errors++;
1073         else
1074                 ndev->stats.tx_packets++;
1075
1076         if (priv->tx_skb) {
1077                 if (!err)
1078                         ndev->stats.tx_bytes += priv->tx_skb->len;
1079                 dev_kfree_skb(priv->tx_skb);
1080                 priv->tx_skb = NULL;
1081         }
1082         locked_reg_bfclr(priv, ECON1, ECON1_TXRTS);
1083         netif_wake_queue(ndev);
1084 }
1085
1086 /*
1087  * RX handler
1088  * ignore PKTIF because is unreliable! (look at the errata datasheet)
1089  * check EPKTCNT is the suggested workaround.
1090  * We don't need to clear interrupt flag, automatically done when
1091  * enc28j60_hw_rx() decrements the packet counter.
1092  * Returns how many packet processed.
1093  */
1094 static int enc28j60_rx_interrupt(struct net_device *ndev)
1095 {
1096         struct enc28j60_net *priv = netdev_priv(ndev);
1097         int pk_counter, ret;
1098
1099         pk_counter = locked_regb_read(priv, EPKTCNT);
1100         if (pk_counter && netif_msg_intr(priv))
1101                 printk(KERN_DEBUG DRV_NAME ": intRX, pk_cnt: %d\n", pk_counter);
1102         if (pk_counter > priv->max_pk_counter) {
1103                 /* update statistics */
1104                 priv->max_pk_counter = pk_counter;
1105                 if (netif_msg_rx_status(priv) && priv->max_pk_counter > 1)
1106                         printk(KERN_DEBUG DRV_NAME ": RX max_pk_cnt: %d\n",
1107                                 priv->max_pk_counter);
1108         }
1109         ret = pk_counter;
1110         while (pk_counter-- > 0)
1111                 enc28j60_hw_rx(ndev);
1112
1113         return ret;
1114 }
1115
1116 static void enc28j60_irq_work_handler(struct work_struct *work)
1117 {
1118         struct enc28j60_net *priv =
1119                 container_of(work, struct enc28j60_net, irq_work);
1120         struct net_device *ndev = priv->netdev;
1121         int intflags, loop;
1122
1123         if (netif_msg_intr(priv))
1124                 printk(KERN_DEBUG DRV_NAME ": %s() enter\n", __func__);
1125         /* disable further interrupts */
1126         locked_reg_bfclr(priv, EIE, EIE_INTIE);
1127
1128         do {
1129                 loop = 0;
1130                 intflags = locked_regb_read(priv, EIR);
1131                 /* DMA interrupt handler (not currently used) */
1132                 if ((intflags & EIR_DMAIF) != 0) {
1133                         loop++;
1134                         if (netif_msg_intr(priv))
1135                                 printk(KERN_DEBUG DRV_NAME
1136                                         ": intDMA(%d)\n", loop);
1137                         locked_reg_bfclr(priv, EIR, EIR_DMAIF);
1138                 }
1139                 /* LINK changed handler */
1140                 if ((intflags & EIR_LINKIF) != 0) {
1141                         loop++;
1142                         if (netif_msg_intr(priv))
1143                                 printk(KERN_DEBUG DRV_NAME
1144                                         ": intLINK(%d)\n", loop);
1145                         enc28j60_check_link_status(ndev);
1146                         /* read PHIR to clear the flag */
1147                         enc28j60_phy_read(priv, PHIR);
1148                 }
1149                 /* TX complete handler */
1150                 if ((intflags & EIR_TXIF) != 0) {
1151                         bool err = false;
1152                         loop++;
1153                         if (netif_msg_intr(priv))
1154                                 printk(KERN_DEBUG DRV_NAME
1155                                         ": intTX(%d)\n", loop);
1156                         priv->tx_retry_count = 0;
1157                         if (locked_regb_read(priv, ESTAT) & ESTAT_TXABRT) {
1158                                 if (netif_msg_tx_err(priv))
1159                                         dev_err(&ndev->dev,
1160                                                 "Tx Error (aborted)\n");
1161                                 err = true;
1162                         }
1163                         if (netif_msg_tx_done(priv)) {
1164                                 u8 tsv[TSV_SIZE];
1165                                 enc28j60_read_tsv(priv, tsv);
1166                                 enc28j60_dump_tsv(priv, "Tx Done", tsv);
1167                         }
1168                         enc28j60_tx_clear(ndev, err);
1169                         locked_reg_bfclr(priv, EIR, EIR_TXIF);
1170                 }
1171                 /* TX Error handler */
1172                 if ((intflags & EIR_TXERIF) != 0) {
1173                         u8 tsv[TSV_SIZE];
1174
1175                         loop++;
1176                         if (netif_msg_intr(priv))
1177                                 printk(KERN_DEBUG DRV_NAME
1178                                         ": intTXErr(%d)\n", loop);
1179                         locked_reg_bfclr(priv, ECON1, ECON1_TXRTS);
1180                         enc28j60_read_tsv(priv, tsv);
1181                         if (netif_msg_tx_err(priv))
1182                                 enc28j60_dump_tsv(priv, "Tx Error", tsv);
1183                         /* Reset TX logic */
1184                         mutex_lock(&priv->lock);
1185                         nolock_reg_bfset(priv, ECON1, ECON1_TXRST);
1186                         nolock_reg_bfclr(priv, ECON1, ECON1_TXRST);
1187                         nolock_txfifo_init(priv, TXSTART_INIT, TXEND_INIT);
1188                         mutex_unlock(&priv->lock);
1189                         /* Transmit Late collision check for retransmit */
1190                         if (TSV_GETBIT(tsv, TSV_TXLATECOLLISION)) {
1191                                 if (netif_msg_tx_err(priv))
1192                                         printk(KERN_DEBUG DRV_NAME
1193                                                 ": LateCollision TXErr (%d)\n",
1194                                                 priv->tx_retry_count);
1195                                 if (priv->tx_retry_count++ < MAX_TX_RETRYCOUNT)
1196                                         locked_reg_bfset(priv, ECON1,
1197                                                            ECON1_TXRTS);
1198                                 else
1199                                         enc28j60_tx_clear(ndev, true);
1200                         } else
1201                                 enc28j60_tx_clear(ndev, true);
1202                         locked_reg_bfclr(priv, EIR, EIR_TXERIF);
1203                 }
1204                 /* RX Error handler */
1205                 if ((intflags & EIR_RXERIF) != 0) {
1206                         loop++;
1207                         if (netif_msg_intr(priv))
1208                                 printk(KERN_DEBUG DRV_NAME
1209                                         ": intRXErr(%d)\n", loop);
1210                         /* Check free FIFO space to flag RX overrun */
1211                         if (enc28j60_get_free_rxfifo(priv) <= 0) {
1212                                 if (netif_msg_rx_err(priv))
1213                                         printk(KERN_DEBUG DRV_NAME
1214                                                 ": RX Overrun\n");
1215                                 ndev->stats.rx_dropped++;
1216                         }
1217                         locked_reg_bfclr(priv, EIR, EIR_RXERIF);
1218                 }
1219                 /* RX handler */
1220                 if (enc28j60_rx_interrupt(ndev))
1221                         loop++;
1222         } while (loop);
1223
1224         /* re-enable interrupts */
1225         locked_reg_bfset(priv, EIE, EIE_INTIE);
1226         if (netif_msg_intr(priv))
1227                 printk(KERN_DEBUG DRV_NAME ": %s() exit\n", __func__);
1228 }
1229
1230 /*
1231  * Hardware transmit function.
1232  * Fill the buffer memory and send the contents of the transmit buffer
1233  * onto the network
1234  */
1235 static void enc28j60_hw_tx(struct enc28j60_net *priv)
1236 {
1237         if (netif_msg_tx_queued(priv))
1238                 printk(KERN_DEBUG DRV_NAME
1239                         ": Tx Packet Len:%d\n", priv->tx_skb->len);
1240
1241         if (netif_msg_pktdata(priv))
1242                 dump_packet(__func__,
1243                             priv->tx_skb->len, priv->tx_skb->data);
1244         enc28j60_packet_write(priv, priv->tx_skb->len, priv->tx_skb->data);
1245
1246 #ifdef CONFIG_ENC28J60_WRITEVERIFY
1247         /* readback and verify written data */
1248         if (netif_msg_drv(priv)) {
1249                 int test_len, k;
1250                 u8 test_buf[64]; /* limit the test to the first 64 bytes */
1251                 int okflag;
1252
1253                 test_len = priv->tx_skb->len;
1254                 if (test_len > sizeof(test_buf))
1255                         test_len = sizeof(test_buf);
1256
1257                 /* + 1 to skip control byte */
1258                 enc28j60_mem_read(priv, TXSTART_INIT + 1, test_len, test_buf);
1259                 okflag = 1;
1260                 for (k = 0; k < test_len; k++) {
1261                         if (priv->tx_skb->data[k] != test_buf[k]) {
1262                                 printk(KERN_DEBUG DRV_NAME
1263                                          ": Error, %d location differ: "
1264                                          "0x%02x-0x%02x\n", k,
1265                                          priv->tx_skb->data[k], test_buf[k]);
1266                                 okflag = 0;
1267                         }
1268                 }
1269                 if (!okflag)
1270                         printk(KERN_DEBUG DRV_NAME ": Tx write buffer, "
1271                                 "verify ERROR!\n");
1272         }
1273 #endif
1274         /* set TX request flag */
1275         locked_reg_bfset(priv, ECON1, ECON1_TXRTS);
1276 }
1277
1278 static netdev_tx_t enc28j60_send_packet(struct sk_buff *skb,
1279                                         struct net_device *dev)
1280 {
1281         struct enc28j60_net *priv = netdev_priv(dev);
1282
1283         if (netif_msg_tx_queued(priv))
1284                 printk(KERN_DEBUG DRV_NAME ": %s() enter\n", __func__);
1285
1286         /* If some error occurs while trying to transmit this
1287          * packet, you should return '1' from this function.
1288          * In such a case you _may not_ do anything to the
1289          * SKB, it is still owned by the network queueing
1290          * layer when an error is returned.  This means you
1291          * may not modify any SKB fields, you may not free
1292          * the SKB, etc.
1293          */
1294         netif_stop_queue(dev);
1295
1296         /* Remember the skb for deferred processing */
1297         priv->tx_skb = skb;
1298         schedule_work(&priv->tx_work);
1299
1300         return NETDEV_TX_OK;
1301 }
1302
1303 static void enc28j60_tx_work_handler(struct work_struct *work)
1304 {
1305         struct enc28j60_net *priv =
1306                 container_of(work, struct enc28j60_net, tx_work);
1307
1308         /* actual delivery of data */
1309         enc28j60_hw_tx(priv);
1310 }
1311
1312 static irqreturn_t enc28j60_irq(int irq, void *dev_id)
1313 {
1314         struct enc28j60_net *priv = dev_id;
1315
1316         /*
1317          * Can't do anything in interrupt context because we need to
1318          * block (spi_sync() is blocking) so fire of the interrupt
1319          * handling workqueue.
1320          * Remember that we access enc28j60 registers through SPI bus
1321          * via spi_sync() call.
1322          */
1323         schedule_work(&priv->irq_work);
1324
1325         return IRQ_HANDLED;
1326 }
1327
1328 static void enc28j60_tx_timeout(struct net_device *ndev)
1329 {
1330         struct enc28j60_net *priv = netdev_priv(ndev);
1331
1332         if (netif_msg_timer(priv))
1333                 dev_err(&ndev->dev, DRV_NAME " tx timeout\n");
1334
1335         ndev->stats.tx_errors++;
1336         /* can't restart safely under softirq */
1337         schedule_work(&priv->restart_work);
1338 }
1339
1340 /*
1341  * Open/initialize the board. This is called (in the current kernel)
1342  * sometime after booting when the 'ifconfig' program is run.
1343  *
1344  * This routine should set everything up anew at each open, even
1345  * registers that "should" only need to be set once at boot, so that
1346  * there is non-reboot way to recover if something goes wrong.
1347  */
1348 static int enc28j60_net_open(struct net_device *dev)
1349 {
1350         struct enc28j60_net *priv = netdev_priv(dev);
1351
1352         if (netif_msg_drv(priv))
1353                 printk(KERN_DEBUG DRV_NAME ": %s() enter\n", __func__);
1354
1355         if (!is_valid_ether_addr(dev->dev_addr)) {
1356                 if (netif_msg_ifup(priv))
1357                         dev_err(&dev->dev, "invalid MAC address %pM\n",
1358                                 dev->dev_addr);
1359                 return -EADDRNOTAVAIL;
1360         }
1361         /* Reset the hardware here (and take it out of low power mode) */
1362         enc28j60_lowpower(priv, false);
1363         enc28j60_hw_disable(priv);
1364         if (!enc28j60_hw_init(priv)) {
1365                 if (netif_msg_ifup(priv))
1366                         dev_err(&dev->dev, "hw_reset() failed\n");
1367                 return -EINVAL;
1368         }
1369         /* Update the MAC address (in case user has changed it) */
1370         enc28j60_set_hw_macaddr(dev);
1371         /* Enable interrupts */
1372         enc28j60_hw_enable(priv);
1373         /* check link status */
1374         enc28j60_check_link_status(dev);
1375         /* We are now ready to accept transmit requests from
1376          * the queueing layer of the networking.
1377          */
1378         netif_start_queue(dev);
1379
1380         return 0;
1381 }
1382
1383 /* The inverse routine to net_open(). */
1384 static int enc28j60_net_close(struct net_device *dev)
1385 {
1386         struct enc28j60_net *priv = netdev_priv(dev);
1387
1388         if (netif_msg_drv(priv))
1389                 printk(KERN_DEBUG DRV_NAME ": %s() enter\n", __func__);
1390
1391         enc28j60_hw_disable(priv);
1392         enc28j60_lowpower(priv, true);
1393         netif_stop_queue(dev);
1394
1395         return 0;
1396 }
1397
1398 /*
1399  * Set or clear the multicast filter for this adapter
1400  * num_addrs == -1      Promiscuous mode, receive all packets
1401  * num_addrs == 0       Normal mode, filter out multicast packets
1402  * num_addrs > 0        Multicast mode, receive normal and MC packets
1403  */
1404 static void enc28j60_set_multicast_list(struct net_device *dev)
1405 {
1406         struct enc28j60_net *priv = netdev_priv(dev);
1407         int oldfilter = priv->rxfilter;
1408
1409         if (dev->flags & IFF_PROMISC) {
1410                 if (netif_msg_link(priv))
1411                         dev_info(&dev->dev, "promiscuous mode\n");
1412                 priv->rxfilter = RXFILTER_PROMISC;
1413         } else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) {
1414                 if (netif_msg_link(priv))
1415                         dev_info(&dev->dev, "%smulticast mode\n",
1416                                 (dev->flags & IFF_ALLMULTI) ? "all-" : "");
1417                 priv->rxfilter = RXFILTER_MULTI;
1418         } else {
1419                 if (netif_msg_link(priv))
1420                         dev_info(&dev->dev, "normal mode\n");
1421                 priv->rxfilter = RXFILTER_NORMAL;
1422         }
1423
1424         if (oldfilter != priv->rxfilter)
1425                 schedule_work(&priv->setrx_work);
1426 }
1427
1428 static void enc28j60_setrx_work_handler(struct work_struct *work)
1429 {
1430         struct enc28j60_net *priv =
1431                 container_of(work, struct enc28j60_net, setrx_work);
1432
1433         if (priv->rxfilter == RXFILTER_PROMISC) {
1434                 if (netif_msg_drv(priv))
1435                         printk(KERN_DEBUG DRV_NAME ": promiscuous mode\n");
1436                 locked_regb_write(priv, ERXFCON, 0x00);
1437         } else if (priv->rxfilter == RXFILTER_MULTI) {
1438                 if (netif_msg_drv(priv))
1439                         printk(KERN_DEBUG DRV_NAME ": multicast mode\n");
1440                 locked_regb_write(priv, ERXFCON,
1441                                         ERXFCON_UCEN | ERXFCON_CRCEN |
1442                                         ERXFCON_BCEN | ERXFCON_MCEN);
1443         } else {
1444                 if (netif_msg_drv(priv))
1445                         printk(KERN_DEBUG DRV_NAME ": normal mode\n");
1446                 locked_regb_write(priv, ERXFCON,
1447                                         ERXFCON_UCEN | ERXFCON_CRCEN |
1448                                         ERXFCON_BCEN);
1449         }
1450 }
1451
1452 static void enc28j60_restart_work_handler(struct work_struct *work)
1453 {
1454         struct enc28j60_net *priv =
1455                         container_of(work, struct enc28j60_net, restart_work);
1456         struct net_device *ndev = priv->netdev;
1457         int ret;
1458
1459         rtnl_lock();
1460         if (netif_running(ndev)) {
1461                 enc28j60_net_close(ndev);
1462                 ret = enc28j60_net_open(ndev);
1463                 if (unlikely(ret)) {
1464                         dev_info(&ndev->dev, " could not restart %d\n", ret);
1465                         dev_close(ndev);
1466                 }
1467         }
1468         rtnl_unlock();
1469 }
1470
1471 /* ......................... ETHTOOL SUPPORT ........................... */
1472
1473 static void
1474 enc28j60_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1475 {
1476         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
1477         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
1478         strlcpy(info->bus_info,
1479                 dev_name(dev->dev.parent), sizeof(info->bus_info));
1480 }
1481
1482 static int
1483 enc28j60_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1484 {
1485         struct enc28j60_net *priv = netdev_priv(dev);
1486
1487         cmd->transceiver = XCVR_INTERNAL;
1488         cmd->supported  = SUPPORTED_10baseT_Half
1489                         | SUPPORTED_10baseT_Full
1490                         | SUPPORTED_TP;
1491         ethtool_cmd_speed_set(cmd,  SPEED_10);
1492         cmd->duplex     = priv->full_duplex ? DUPLEX_FULL : DUPLEX_HALF;
1493         cmd->port       = PORT_TP;
1494         cmd->autoneg    = AUTONEG_DISABLE;
1495
1496         return 0;
1497 }
1498
1499 static int
1500 enc28j60_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1501 {
1502         return enc28j60_setlink(dev, cmd->autoneg,
1503                                 ethtool_cmd_speed(cmd), cmd->duplex);
1504 }
1505
1506 static u32 enc28j60_get_msglevel(struct net_device *dev)
1507 {
1508         struct enc28j60_net *priv = netdev_priv(dev);
1509         return priv->msg_enable;
1510 }
1511
1512 static void enc28j60_set_msglevel(struct net_device *dev, u32 val)
1513 {
1514         struct enc28j60_net *priv = netdev_priv(dev);
1515         priv->msg_enable = val;
1516 }
1517
1518 static const struct ethtool_ops enc28j60_ethtool_ops = {
1519         .get_settings   = enc28j60_get_settings,
1520         .set_settings   = enc28j60_set_settings,
1521         .get_drvinfo    = enc28j60_get_drvinfo,
1522         .get_msglevel   = enc28j60_get_msglevel,
1523         .set_msglevel   = enc28j60_set_msglevel,
1524 };
1525
1526 static int enc28j60_chipset_init(struct net_device *dev)
1527 {
1528         struct enc28j60_net *priv = netdev_priv(dev);
1529
1530         return enc28j60_hw_init(priv);
1531 }
1532
1533 static const struct net_device_ops enc28j60_netdev_ops = {
1534         .ndo_open               = enc28j60_net_open,
1535         .ndo_stop               = enc28j60_net_close,
1536         .ndo_start_xmit         = enc28j60_send_packet,
1537         .ndo_set_multicast_list = enc28j60_set_multicast_list,
1538         .ndo_set_mac_address    = enc28j60_set_mac_address,
1539         .ndo_tx_timeout         = enc28j60_tx_timeout,
1540         .ndo_change_mtu         = eth_change_mtu,
1541         .ndo_validate_addr      = eth_validate_addr,
1542 };
1543
1544 static int __devinit enc28j60_probe(struct spi_device *spi)
1545 {
1546         struct net_device *dev;
1547         struct enc28j60_net *priv;
1548         int ret = 0;
1549
1550         if (netif_msg_drv(&debug))
1551                 dev_info(&spi->dev, DRV_NAME " Ethernet driver %s loaded\n",
1552                         DRV_VERSION);
1553
1554         dev = alloc_etherdev(sizeof(struct enc28j60_net));
1555         if (!dev) {
1556                 if (netif_msg_drv(&debug))
1557                         dev_err(&spi->dev, DRV_NAME
1558                                 ": unable to alloc new ethernet\n");
1559                 ret = -ENOMEM;
1560                 goto error_alloc;
1561         }
1562         priv = netdev_priv(dev);
1563
1564         priv->netdev = dev;     /* priv to netdev reference */
1565         priv->spi = spi;        /* priv to spi reference */
1566         priv->msg_enable = netif_msg_init(debug.msg_enable,
1567                                                 ENC28J60_MSG_DEFAULT);
1568         mutex_init(&priv->lock);
1569         INIT_WORK(&priv->tx_work, enc28j60_tx_work_handler);
1570         INIT_WORK(&priv->setrx_work, enc28j60_setrx_work_handler);
1571         INIT_WORK(&priv->irq_work, enc28j60_irq_work_handler);
1572         INIT_WORK(&priv->restart_work, enc28j60_restart_work_handler);
1573         dev_set_drvdata(&spi->dev, priv);       /* spi to priv reference */
1574         SET_NETDEV_DEV(dev, &spi->dev);
1575
1576         if (!enc28j60_chipset_init(dev)) {
1577                 if (netif_msg_probe(priv))
1578                         dev_info(&spi->dev, DRV_NAME " chip not found\n");
1579                 ret = -EIO;
1580                 goto error_irq;
1581         }
1582         random_ether_addr(dev->dev_addr);
1583         enc28j60_set_hw_macaddr(dev);
1584
1585         /* Board setup must set the relevant edge trigger type;
1586          * level triggers won't currently work.
1587          */
1588         ret = request_irq(spi->irq, enc28j60_irq, 0, DRV_NAME, priv);
1589         if (ret < 0) {
1590                 if (netif_msg_probe(priv))
1591                         dev_err(&spi->dev, DRV_NAME ": request irq %d failed "
1592                                 "(ret = %d)\n", spi->irq, ret);
1593                 goto error_irq;
1594         }
1595
1596         dev->if_port = IF_PORT_10BASET;
1597         dev->irq = spi->irq;
1598         dev->netdev_ops = &enc28j60_netdev_ops;
1599         dev->watchdog_timeo = TX_TIMEOUT;
1600         SET_ETHTOOL_OPS(dev, &enc28j60_ethtool_ops);
1601
1602         enc28j60_lowpower(priv, true);
1603
1604         ret = register_netdev(dev);
1605         if (ret) {
1606                 if (netif_msg_probe(priv))
1607                         dev_err(&spi->dev, "register netdev " DRV_NAME
1608                                 " failed (ret = %d)\n", ret);
1609                 goto error_register;
1610         }
1611         dev_info(&dev->dev, DRV_NAME " driver registered\n");
1612
1613         return 0;
1614
1615 error_register:
1616         free_irq(spi->irq, priv);
1617 error_irq:
1618         free_netdev(dev);
1619 error_alloc:
1620         return ret;
1621 }
1622
1623 static int __devexit enc28j60_remove(struct spi_device *spi)
1624 {
1625         struct enc28j60_net *priv = dev_get_drvdata(&spi->dev);
1626
1627         if (netif_msg_drv(priv))
1628                 printk(KERN_DEBUG DRV_NAME ": remove\n");
1629
1630         unregister_netdev(priv->netdev);
1631         free_irq(spi->irq, priv);
1632         free_netdev(priv->netdev);
1633
1634         return 0;
1635 }
1636
1637 static struct spi_driver enc28j60_driver = {
1638         .driver = {
1639                    .name = DRV_NAME,
1640                    .owner = THIS_MODULE,
1641          },
1642         .probe = enc28j60_probe,
1643         .remove = __devexit_p(enc28j60_remove),
1644 };
1645
1646 static int __init enc28j60_init(void)
1647 {
1648         msec20_to_jiffies = msecs_to_jiffies(20);
1649
1650         return spi_register_driver(&enc28j60_driver);
1651 }
1652
1653 module_init(enc28j60_init);
1654
1655 static void __exit enc28j60_exit(void)
1656 {
1657         spi_unregister_driver(&enc28j60_driver);
1658 }
1659
1660 module_exit(enc28j60_exit);
1661
1662 MODULE_DESCRIPTION(DRV_NAME " ethernet driver");
1663 MODULE_AUTHOR("Claudio Lanconelli <lanconelli.claudio@eptar.com>");
1664 MODULE_LICENSE("GPL");
1665 module_param_named(debug, debug.msg_enable, int, 0);
1666 MODULE_PARM_DESC(debug, "Debug verbosity level (0=none, ..., ffff=all)");
1667 MODULE_ALIAS("spi:" DRV_NAME);