drivers/net/arm/ether3.c

   1 /*
   2  *  linux/drivers/acorn/net/ether3.c
   3  *
   4  *  Copyright (C) 1995-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
  11  *  for Acorn machines
  12  *
  13  * By Russell King, with some suggestions from borris@ant.co.uk
  14  *
  15  * Changelog:
  16  * 1.04 RMK     29/02/1996      Won't pass packets that are from our ethernet
  17  *                              address up to the higher levels - they're
  18  *                              silently ignored.  I/F can now be put into
  19  *                              multicast mode.  Receiver routine optimised.
  20  * 1.05 RMK     30/02/1996      Now claims interrupt at open when part of
  21  *                              the kernel rather than when a module.
  22  * 1.06 RMK     02/03/1996      Various code cleanups
  23  * 1.07 RMK     13/10/1996      Optimised interrupt routine and transmit
  24  *                              routines.
  25  * 1.08 RMK     14/10/1996      Fixed problem with too many packets,
  26  *                              prevented the kernel message about dropped
  27  *                              packets appearing too many times a second.
  28  *                              Now does not disable all IRQs, only the IRQ
  29  *                              used by this card.
  30  * 1.09 RMK     10/11/1996      Only enables TX irq when buffer space is low,
  31  *                              but we still service the TX queue if we get a
  32  *                              RX interrupt.
  33  * 1.10 RMK     15/07/1997      Fixed autoprobing of NQ8004.
  34  * 1.11 RMK     16/11/1997      Fixed autoprobing of NQ8005A.
  35  * 1.12 RMK     31/12/1997      Removed reference to dev_tint for Linux 2.1.
  36  *      RMK     27/06/1998      Changed asm/delay.h to linux/delay.h.
  37  * 1.13 RMK     29/06/1998      Fixed problem with transmission of packets.
  38  *                              Chip seems to have a bug in, whereby if the
  39  *                              packet starts two bytes from the end of the
  40  *                              buffer, it corrupts the receiver chain, and
  41  *                              never updates the transmit status correctly.
  42  * 1.14 RMK     07/01/1998      Added initial code for ETHERB addressing.
  43  * 1.15 RMK     30/04/1999      More fixes to the transmit routine for buggy
  44  *                              hardware.
  45  * 1.16 RMK     10/02/2000      Updated for 2.3.43
  46  * 1.17 RMK     13/05/2000      Updated for 2.3.99-pre8
  47  */
  48
  49 #include <linux/module.h>
  50 #include <linux/kernel.h>
  51 #include <linux/types.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/interrupt.h>
  54 #include <linux/ioport.h>
  55 #include <linux/in.h>
  56 #include <linux/slab.h>
  57 #include <linux/string.h>
  58 #include <linux/errno.h>
  59 #include <linux/netdevice.h>
  60 #include <linux/etherdevice.h>
  61 #include <linux/skbuff.h>
  62 #include <linux/device.h>
  63 #include <linux/init.h>
  64 #include <linux/delay.h>
  65 #include <linux/bitops.h>
  66
  67 #include <asm/system.h>
  68 #include <asm/ecard.h>
  69 #include <asm/io.h>
  70
  71 static char version[] __devinitdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  72
  73 #include "ether3.h"
  74
  75 static unsigned int net_debug = NET_DEBUG;
  76
  77 static void     ether3_setmulticastlist(struct net_device *dev);
  78 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
  79 static void     ether3_tx(struct net_device *dev);
  80 static int      ether3_open (struct net_device *dev);
  81 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
  82 static irqreturn_t ether3_interrupt (int irq, void *dev_id);
  83 static int      ether3_close (struct net_device *dev);
  84 static void     ether3_setmulticastlist (struct net_device *dev);
  85 static void     ether3_timeout(struct net_device *dev);
  86
  87 #define BUS_16          2
  88 #define BUS_8           1
  89 #define BUS_UNKNOWN     0
  90
  91 /* --------------------------------------------------------------------------- */
  92
  93 typedef enum {
  94         buffer_write,
  95         buffer_read
  96 } buffer_rw_t;
  97
  98 /*
  99  * ether3 read/write.  Slow things down a bit...
 100  * The SEEQ8005 doesn't like us writing to its registers
 101  * too quickly.
 102  */
 103 static inline void ether3_outb(int v, const void __iomem *r)
 104 {
 105         writeb(v, r);
 106         udelay(1);
 107 }
 108
 109 static inline void ether3_outw(int v, const void __iomem *r)
 110 {
 111         writew(v, r);
 112         udelay(1);
 113 }
 114 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
 115 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
 116
 117 static int
 118 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
 119 {
 120         int timeout = 1000;
 121
 122         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 123         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 124
 125         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
 126                 if (!timeout--) {
 127                         printk("%s: setbuffer broken\n", dev->name);
 128                         priv(dev)->broken = 1;
 129                         return 1;
 130                 }
 131                 udelay(1);
 132         }
 133
 134         if (read == buffer_read) {
 135                 ether3_outw(start, REG_DMAADDR);
 136                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
 137         } else {
 138                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 139                 ether3_outw(start, REG_DMAADDR);
 140         }
 141         return 0;
 142 }
 143
 144 /*
 145  * write data to the buffer memory
 146  */
 147 #define ether3_writebuffer(dev,data,length)                     \
 148         writesw(REG_BUFWIN, (data), (length) >> 1)
 149
 150 #define ether3_writeword(dev,data)                              \
 151         writew((data), REG_BUFWIN)
 152
 153 #define ether3_writelong(dev,data)      {                       \
 154         void __iomem *reg_bufwin = REG_BUFWIN;                  \
 155         writew((data), reg_bufwin);                             \
 156         writew((data) >> 16, reg_bufwin);                       \
 157 }
 158
 159 /*
 160  * read data from the buffer memory
 161  */
 162 #define ether3_readbuffer(dev,data,length)                      \
 163         readsw(REG_BUFWIN, (data), (length) >> 1)
 164
 165 #define ether3_readword(dev)                                    \
 166         readw(REG_BUFWIN)
 167
 168 #define ether3_readlong(dev)                                    \
 169         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
 170
 171 /*
 172  * Switch LED off...
 173  */
 174 static void ether3_ledoff(unsigned long data)
 175 {
 176         struct net_device *dev = (struct net_device *)data;
 177         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
 178 }
 179
 180 /*
 181  * switch LED on...
 182  */
 183 static inline void ether3_ledon(struct net_device *dev)
 184 {
 185         del_timer(&priv(dev)->timer);
 186         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
 187         priv(dev)->timer.data = (unsigned long)dev;
 188         priv(dev)->timer.function = ether3_ledoff;
 189         add_timer(&priv(dev)->timer);
 190         if (priv(dev)->regs.config2 & CFG2_CTRLO)
 191                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
 192 }
 193
 194 /*
 195  * Read the ethernet address string from the on board rom.
 196  * This is an ascii string!!!
 197  */
 198 static int __devinit
 199 ether3_addr(char *addr, struct expansion_card *ec)
 200 {
 201         struct in_chunk_dir cd;
 202         char *s;
 203
 204         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
 205                 int i;
 206                 for (i = 0; i<6; i++) {
 207                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
 208                         if (*s != (i==5?')' : ':' ))
 209                                 break;
 210                 }
 211                 if (i == 6)
 212                         return 0;
 213         }
 214         /* I wonder if we should even let the user continue in this case
 215          *   - no, it would be better to disable the device
 216          */
 217         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
 218         return -ENODEV;
 219 }
 220
 221 /* --------------------------------------------------------------------------- */
 222
 223 static int __devinit
 224 ether3_ramtest(struct net_device *dev, unsigned char byte)
 225 {
 226         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
 227         int i,ret = 0;
 228         int max_errors = 4;
 229         int bad = -1;
 230
 231         if (!buffer)
 232                 return 1;
 233
 234         memset(buffer, byte, RX_END);
 235         ether3_setbuffer(dev, buffer_write, 0);
 236         ether3_writebuffer(dev, buffer, TX_END);
 237         ether3_setbuffer(dev, buffer_write, RX_START);
 238         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
 239         memset(buffer, byte ^ 0xff, RX_END);
 240         ether3_setbuffer(dev, buffer_read, 0);
 241         ether3_readbuffer(dev, buffer, TX_END);
 242         ether3_setbuffer(dev, buffer_read, RX_START);
 243         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
 244
 245         for (i = 0; i < RX_END; i++) {
 246                 if (buffer[i] != byte) {
 247                         if (max_errors > 0 && bad != buffer[i]) {
 248                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 249                                        dev->name, buffer[i], byte, i);
 250                                 ret = 2;
 251                                 max_errors--;
 252                                 bad = i;
 253                         }
 254                 } else {
 255                         if (bad != -1) {
 256                                 if (bad != i - 1)
 257                                         printk(" - 0x%04X\n", i - 1);
 258                                 printk("\n");
 259                                 bad = -1;
 260                         }
 261                 }
 262         }
 263         if (bad != -1)
 264                 printk(" - 0xffff\n");
 265         kfree(buffer);
 266
 267         return ret;
 268 }
 269
 270 /* ------------------------------------------------------------------------------- */
 271
 272 static int __devinit ether3_init_2(struct net_device *dev)
 273 {
 274         int i;
 275
 276         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
 277         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
 278         priv(dev)->regs.command = 0;
 279
 280         /*
 281          * Set up our hardware address
 282          */
 283         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 284         for (i = 0; i < 6; i++)
 285                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 286
 287         if (dev->flags & IFF_PROMISC)
 288                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 289         else if (dev->flags & IFF_MULTICAST)
 290                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 291         else
 292                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 293
 294         /*
 295          * There is a problem with the NQ8005 in that it occasionally loses the
 296          * last two bytes.  To get round this problem, we receive the CRC as
 297          * well.  That way, if we do lose the last two, then it doesn't matter.
 298          */
 299         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 300         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 301         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 302         ether3_outw(0, REG_TRANSMITPTR);
 303         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 304         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 305         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 306         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
 307
 308         i = ether3_ramtest(dev, 0x5A);
 309         if(i)
 310                 return i;
 311         i = ether3_ramtest(dev, 0x1E);
 312         if(i)
 313                 return i;
 314
 315         ether3_setbuffer(dev, buffer_write, 0);
 316         ether3_writelong(dev, 0);
 317         return 0;
 318 }
 319
 320 static void
 321 ether3_init_for_open(struct net_device *dev)
 322 {
 323         int i;
 324
 325         /* Reset the chip */
 326         ether3_outw(CFG2_RESET, REG_CONFIG2);
 327         udelay(4);
 328
 329         priv(dev)->regs.command = 0;
 330         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 331         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 332                 barrier();
 333
 334         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 335         for (i = 0; i < 6; i++)
 336                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 337
 338         priv(dev)->tx_head      = 0;
 339         priv(dev)->tx_tail      = 0;
 340         priv(dev)->regs.config2 |= CFG2_CTRLO;
 341         priv(dev)->rx_head      = RX_START;
 342
 343         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 344         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 345         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 346         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 347         ether3_outw(0, REG_TRANSMITPTR);
 348         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 349         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 350
 351         ether3_setbuffer(dev, buffer_write, 0);
 352         ether3_writelong(dev, 0);
 353
 354         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
 355         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 356 }
 357
 358 static inline int
 359 ether3_probe_bus_8(struct net_device *dev, int val)
 360 {
 361         int write_low, write_high, read_low, read_high;
 362
 363         write_low = val & 255;
 364         write_high = val >> 8;
 365
 366         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
 367
 368         ether3_outb(write_low, REG_RECVPTR);
 369         ether3_outb(write_high, REG_RECVPTR + 4);
 370
 371         read_low = ether3_inb(REG_RECVPTR);
 372         read_high = ether3_inb(REG_RECVPTR + 4);
 373
 374         printk(", read8 [%02X:%02X]\n", read_high, read_low);
 375
 376         return read_low == write_low && read_high == write_high;
 377 }
 378
 379 static inline int
 380 ether3_probe_bus_16(struct net_device *dev, int val)
 381 {
 382         int read_val;
 383
 384         ether3_outw(val, REG_RECVPTR);
 385         read_val = ether3_inw(REG_RECVPTR);
 386
 387         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
 388
 389         return read_val == val;
 390 }
 391
 392 /*
 393  * Open/initialize the board.  This is called (in the current kernel)
 394  * sometime after booting when the 'ifconfig' program is run.
 395  *
 396  * This routine should set everything up anew at each open, even
 397  * registers that "should" only need to be set once at boot, so that
 398  * there is non-reboot way to recover if something goes wrong.
 399  */
 400 static int
 401 ether3_open(struct net_device *dev)
 402 {
 403         if (!is_valid_ether_addr(dev->dev_addr)) {
 404                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
 405                         dev->name);
 406                 return -EINVAL;
 407         }
 408
 409         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 410                 return -EAGAIN;
 411
 412         ether3_init_for_open(dev);
 413
 414         netif_start_queue(dev);
 415
 416         return 0;
 417 }
 418
 419 /*
 420  * The inverse routine to ether3_open().
 421  */
 422 static int
 423 ether3_close(struct net_device *dev)
 424 {
 425         netif_stop_queue(dev);
 426
 427         disable_irq(dev->irq);
 428
 429         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 430         priv(dev)->regs.command = 0;
 431         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 432                 barrier();
 433         ether3_outb(0x80, REG_CONFIG2 + 4);
 434         ether3_outw(0, REG_COMMAND);
 435
 436         free_irq(dev->irq, dev);
 437
 438         return 0;
 439 }
 440
 441 /*
 442  * Set or clear promiscuous/multicast mode filter for this adaptor.
 443  *
 444  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 445  * in which does not have the other ethernet address registers present...
 446  */
 447 static void ether3_setmulticastlist(struct net_device *dev)
 448 {
 449         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
 450
 451         if (dev->flags & IFF_PROMISC) {
 452                 /* promiscuous mode */
 453                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 454         } else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
 455                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 456         } else
 457                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 458
 459         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 460 }
 461
 462 static void ether3_timeout(struct net_device *dev)
 463 {
 464         unsigned long flags;
 465
 466         del_timer(&priv(dev)->timer);
 467
 468         local_irq_save(flags);
 469         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 470         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 471                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 472         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 473                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 474         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 475                 priv(dev)->tx_head, priv(dev)->tx_tail);
 476         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
 477         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 478         local_irq_restore(flags);
 479
 480         priv(dev)->regs.config2 |= CFG2_CTRLO;
 481         dev->stats.tx_errors += 1;
 482         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 483         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
 484
 485         netif_wake_queue(dev);
 486 }
 487
 488 /*
 489  * Transmit a packet
 490  */
 491 static int
 492 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 493 {
 494         unsigned long flags;
 495         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 496         unsigned int ptr, next_ptr;
 497
 498         if (priv(dev)->broken) {
 499                 dev_kfree_skb(skb);
 500                 dev->stats.tx_dropped++;
 501                 netif_start_queue(dev);
 502                 return NETDEV_TX_OK;
 503         }
 504
 505         length = (length + 1) & ~1;
 506         if (length != skb->len) {
 507                 if (skb_padto(skb, length))
 508                         goto out;
 509         }
 510
 511         next_ptr = (priv(dev)->tx_head + 1) & 15;
 512
 513         local_irq_save(flags);
 514
 515         if (priv(dev)->tx_tail == next_ptr) {
 516                 local_irq_restore(flags);
 517                 return NETDEV_TX_BUSY;  /* unable to queue */
 518         }
 519
 520         ptr              = 0x600 * priv(dev)->tx_head;
 521         priv(dev)->tx_head = next_ptr;
 522         next_ptr        *= 0x600;
 523
 524 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 525
 526         ether3_setbuffer(dev, buffer_write, next_ptr);
 527         ether3_writelong(dev, 0);
 528         ether3_setbuffer(dev, buffer_write, ptr);
 529         ether3_writelong(dev, 0);
 530         ether3_writebuffer(dev, skb->data, length);
 531         ether3_writeword(dev, htons(next_ptr));
 532         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 533         ether3_setbuffer(dev, buffer_write, ptr);
 534         ether3_writeword(dev, htons((ptr + length + 4)));
 535         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 536         ether3_ledon(dev);
 537
 538         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 539                 ether3_outw(ptr, REG_TRANSMITPTR);
 540                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
 541         }
 542
 543         next_ptr = (priv(dev)->tx_head + 1) & 15;
 544         local_irq_restore(flags);
 545
 546         dev_kfree_skb(skb);
 547
 548         if (priv(dev)->tx_tail == next_ptr)
 549                 netif_stop_queue(dev);
 550
 551  out:
 552         return NETDEV_TX_OK;
 553 }
 554
 555 static irqreturn_t
 556 ether3_interrupt(int irq, void *dev_id)
 557 {
 558         struct net_device *dev = (struct net_device *)dev_id;
 559         unsigned int status, handled = IRQ_NONE;
 560
 561 #if NET_DEBUG > 1
 562         if(net_debug & DEBUG_INT)
 563                 printk("eth3irq: %d ", irq);
 564 #endif
 565
 566         status = ether3_inw(REG_STATUS);
 567
 568         if (status & STAT_INTRX) {
 569                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
 570                 ether3_rx(dev, 12);
 571                 handled = IRQ_HANDLED;
 572         }
 573
 574         if (status & STAT_INTTX) {
 575                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
 576                 ether3_tx(dev);
 577                 handled = IRQ_HANDLED;
 578         }
 579
 580 #if NET_DEBUG > 1
 581         if(net_debug & DEBUG_INT)
 582                 printk("done\n");
 583 #endif
 584         return handled;
 585 }
 586
 587 /*
 588  * If we have a good packet(s), get it/them out of the buffers.
 589  */
 590 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
 591 {
 592         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
 593
 594         ether3_ledon(dev);
 595
 596         do {
 597                 unsigned int this_ptr, status;
 598                 unsigned char addrs[16];
 599
 600                 /*
 601                  * read the first 16 bytes from the buffer.
 602                  * This contains the status bytes etc and ethernet addresses,
 603                  * and we also check the source ethernet address to see if
 604                  * it originated from us.
 605                  */
 606                 {
 607                         unsigned int temp_ptr;
 608                         ether3_setbuffer(dev, buffer_read, next_ptr);
 609                         temp_ptr = ether3_readword(dev);
 610                         status = ether3_readword(dev);
 611                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 612                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 613                                 break;
 614
 615                         this_ptr = next_ptr + 4;
 616                         next_ptr = ntohs(temp_ptr);
 617                 }
 618                 ether3_setbuffer(dev, buffer_read, this_ptr);
 619                 ether3_readbuffer(dev, addrs+2, 12);
 620
 621 if (next_ptr < RX_START || next_ptr >= RX_END) {
 622  int i;
 623  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 624  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 625  for (i = 2; i < 14; i++)
 626    printk("%02X ", addrs[i]);
 627  printk("\n");
 628  next_ptr = priv(dev)->rx_head;
 629  break;
 630 }
 631                 /*
 632                  * ignore our own packets...
 633                  */
 634                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 635                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 636                         maxcnt ++; /* compensate for loopedback packet */
 637                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 638                 } else
 639                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 640                         unsigned int length = next_ptr - this_ptr;
 641                         struct sk_buff *skb;
 642
 643                         if (next_ptr <= this_ptr)
 644                                 length += RX_END - RX_START;
 645
 646                         skb = dev_alloc_skb(length + 2);
 647                         if (skb) {
 648                                 unsigned char *buf;
 649
 650                                 skb_reserve(skb, 2);
 651                                 buf = skb_put(skb, length);
 652                                 ether3_readbuffer(dev, buf + 12, length - 12);
 653                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 654                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 655                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 656                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 657                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 658                                 skb->protocol = eth_type_trans(skb, dev);
 659                                 netif_rx(skb);
 660                                 received ++;
 661                         } else
 662                                 goto dropping;
 663                 } else {
 664                         struct net_device_stats *stats = &dev->stats;
 665                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 666                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 667                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 668                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 669                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 670                         stats->rx_errors++;
 671                 }
 672         }
 673         while (-- maxcnt);
 674
 675 done:
 676         dev->stats.rx_packets += received;
 677         priv(dev)->rx_head = next_ptr;
 678         /*
 679          * If rx went off line, then that means that the buffer may be full.  We
 680          * have dropped at least one packet.
 681          */
 682         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 683                 dev->stats.rx_dropped++;
 684                 ether3_outw(next_ptr, REG_RECVPTR);
 685                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 686         }
 687
 688         return maxcnt;
 689
 690 dropping:{
 691         static unsigned long last_warned;
 692
 693         ether3_outw(next_ptr >> 8, REG_RECVEND);
 694         /*
 695          * Don't print this message too many times...
 696          */
 697         if (time_after(jiffies, last_warned + 10 * HZ)) {
 698                 last_warned = jiffies;
 699                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
 700         }
 701         dev->stats.rx_dropped++;
 702         goto done;
 703         }
 704 }
 705
 706 /*
 707  * Update stats for the transmitted packet(s)
 708  */
 709 static void ether3_tx(struct net_device *dev)
 710 {
 711         unsigned int tx_tail = priv(dev)->tx_tail;
 712         int max_work = 14;
 713
 714         do {
 715                 unsigned long status;
 716
 717                 /*
 718                  * Read the packet header
 719                  */
 720                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 721                 status = ether3_readlong(dev);
 722
 723                 /*
 724                  * Check to see if this packet has been transmitted
 725                  */
 726                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 727                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 728                         break;
 729
 730                 /*
 731                  * Update errors
 732                  */
 733                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 734                         dev->stats.tx_packets++;
 735                 else {
 736                         dev->stats.tx_errors++;
 737                         if (status & TXSTAT_16COLLISIONS)
 738                                 dev->stats.collisions += 16;
 739                         if (status & TXSTAT_BABBLED)
 740                                 dev->stats.tx_fifo_errors++;
 741                 }
 742
 743                 tx_tail = (tx_tail + 1) & 15;
 744         } while (--max_work);
 745
 746         if (priv(dev)->tx_tail != tx_tail) {
 747                 priv(dev)->tx_tail = tx_tail;
 748                 netif_wake_queue(dev);
 749         }
 750 }
 751
 752 static void __devinit ether3_banner(void)
 753 {
 754         static unsigned version_printed = 0;
 755
 756         if (net_debug && version_printed++ == 0)
 757                 printk(KERN_INFO "%s", version);
 758 }
 759
 760 static const struct net_device_ops ether3_netdev_ops = {
 761         .ndo_open               = ether3_open,
 762         .ndo_stop               = ether3_close,
 763         .ndo_start_xmit         = ether3_sendpacket,
 764         .ndo_set_multicast_list = ether3_setmulticastlist,
 765         .ndo_tx_timeout         = ether3_timeout,
 766         .ndo_validate_addr      = eth_validate_addr,
 767         .ndo_change_mtu         = eth_change_mtu,
 768         .ndo_set_mac_address    = eth_mac_addr,
 769 };
 770
 771 static int __devinit
 772 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 773 {
 774         const struct ether3_data *data = id->data;
 775         struct net_device *dev;
 776         int bus_type, ret;
 777
 778         ether3_banner();
 779
 780         ret = ecard_request_resources(ec);
 781         if (ret)
 782                 goto out;
 783
 784         dev = alloc_etherdev(sizeof(struct dev_priv));
 785         if (!dev) {
 786                 ret = -ENOMEM;
 787                 goto release;
 788         }
 789
 790         SET_NETDEV_DEV(dev, &ec->dev);
 791
 792         priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 793         if (!priv(dev)->base) {
 794                 ret = -ENOMEM;
 795                 goto free;
 796         }
 797
 798         ec->irqaddr = priv(dev)->base + data->base_offset;
 799         ec->irqmask = 0xf0;
 800
 801         priv(dev)->seeq = priv(dev)->base + data->base_offset;
 802         dev->irq = ec->irq;
 803
 804         ether3_addr(dev->dev_addr, ec);
 805
 806         init_timer(&priv(dev)->timer);
 807
 808         /* Reset card...
 809          */
 810         ether3_outb(0x80, REG_CONFIG2 + 4);
 811         bus_type = BUS_UNKNOWN;
 812         udelay(4);
 813
 814         /* Test using Receive Pointer (16-bit register) to find out
 815          * how the ether3 is connected to the bus...
 816          */
 817         if (ether3_probe_bus_8(dev, 0x100) &&
 818             ether3_probe_bus_8(dev, 0x201))
 819                 bus_type = BUS_8;
 820
 821         if (bus_type == BUS_UNKNOWN &&
 822             ether3_probe_bus_16(dev, 0x101) &&
 823             ether3_probe_bus_16(dev, 0x201))
 824                 bus_type = BUS_16;
 825
 826         switch (bus_type) {
 827         case BUS_UNKNOWN:
 828                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 829                 ret = -ENODEV;
 830                 goto free;
 831
 832         case BUS_8:
 833                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 834                         "8-bit card\n", dev->name, data->name);
 835                 ret = -ENODEV;
 836                 goto free;
 837
 838         default:
 839                 break;
 840         }
 841
 842         if (ether3_init_2(dev)) {
 843                 ret = -ENODEV;
 844                 goto free;
 845         }
 846
 847         dev->netdev_ops         = &ether3_netdev_ops;
 848         dev->watchdog_timeo     = 5 * HZ / 100;
 849
 850         ret = register_netdev(dev);
 851         if (ret)
 852                 goto free;
 853
 854         printk("%s: %s in slot %d, %pM\n",
 855                dev->name, data->name, ec->slot_no, dev->dev_addr);
 856
 857         ecard_set_drvdata(ec, dev);
 858         return 0;
 859
 860  free:
 861         free_netdev(dev);
 862  release:
 863         ecard_release_resources(ec);
 864  out:
 865         return ret;
 866 }
 867
 868 static void __devexit ether3_remove(struct expansion_card *ec)
 869 {
 870         struct net_device *dev = ecard_get_drvdata(ec);
 871
 872         ecard_set_drvdata(ec, NULL);
 873
 874         unregister_netdev(dev);
 875         free_netdev(dev);
 876         ecard_release_resources(ec);
 877 }
 878
 879 static struct ether3_data ether3 = {
 880         .name           = "ether3",
 881         .base_offset    = 0,
 882 };
 883
 884 static struct ether3_data etherb = {
 885         .name           = "etherb",
 886         .base_offset    = 0x800,
 887 };
 888
 889 static const struct ecard_id ether3_ids[] = {
 890         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
 891         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
 892         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
 893         { 0xffff, 0xffff }
 894 };
 895
 896 static struct ecard_driver ether3_driver = {
 897         .probe          = ether3_probe,
 898         .remove         = __devexit_p(ether3_remove),
 899         .id_table       = ether3_ids,
 900         .drv = {
 901                 .name   = "ether3",
 902         },
 903 };
 904
 905 static int __init ether3_init(void)
 906 {
 907         return ecard_register_driver(&ether3_driver);
 908 }
 909
 910 static void __exit ether3_exit(void)
 911 {
 912         ecard_remove_driver(&ether3_driver);
 913 }
 914
 915 module_init(ether3_init);
 916 module_exit(ether3_exit);
 917
 918 MODULE_LICENSE("GPL");