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/sched.h>
  52 #include <linux/types.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/ptrace.h>
  56 #include <linux/ioport.h>
  57 #include <linux/in.h>
  58 #include <linux/slab.h>
  59 #include <linux/string.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/etherdevice.h>
  63 #include <linux/skbuff.h>
  64 #include <linux/device.h>
  65 #include <linux/init.h>
  66 #include <linux/delay.h>
  67 #include <linux/bitops.h>
  68
  69 #include <asm/system.h>
  70 #include <asm/ecard.h>
  71 #include <asm/io.h>
  72 #include <asm/irq.h>
  73
  74 static char version[] __initdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
  75
  76 #include "ether3.h"
  77
  78 static unsigned int net_debug = NET_DEBUG;
  79
  80 static void     ether3_setmulticastlist(struct net_device *dev);
  81 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
  82 static void     ether3_tx(struct net_device *dev);
  83 static int      ether3_open (struct net_device *dev);
  84 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
  85 static irqreturn_t ether3_interrupt (int irq, void *dev_id, struct pt_regs *regs);
  86 static int      ether3_close (struct net_device *dev);
  87 static struct net_device_stats *ether3_getstats (struct net_device *dev);
  88 static void     ether3_setmulticastlist (struct net_device *dev);
  89 static void     ether3_timeout(struct net_device *dev);
  90
  91 #define BUS_16          2
  92 #define BUS_8           1
  93 #define BUS_UNKNOWN     0
  94
  95 /* --------------------------------------------------------------------------- */
  96
  97 typedef enum {
  98         buffer_write,
  99         buffer_read
 100 } buffer_rw_t;
 101
 102 /*
 103  * ether3 read/write.  Slow things down a bit...
 104  * The SEEQ8005 doesn't like us writing to its registers
 105  * too quickly.
 106  */
 107 static inline void ether3_outb(int v, const void __iomem *r)
 108 {
 109         writeb(v, r);
 110         udelay(1);
 111 }
 112
 113 static inline void ether3_outw(int v, const void __iomem *r)
 114 {
 115         writew(v, r);
 116         udelay(1);
 117 }
 118 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
 119 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
 120
 121 static int
 122 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
 123 {
 124         int timeout = 1000;
 125
 126         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 127         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 128
 129         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
 130                 if (!timeout--) {
 131                         printk("%s: setbuffer broken\n", dev->name);
 132                         priv(dev)->broken = 1;
 133                         return 1;
 134                 }
 135                 udelay(1);
 136         }
 137
 138         if (read == buffer_read) {
 139                 ether3_outw(start, REG_DMAADDR);
 140                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
 141         } else {
 142                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
 143                 ether3_outw(start, REG_DMAADDR);
 144         }
 145         return 0;
 146 }
 147
 148 /*
 149  * write data to the buffer memory
 150  */
 151 #define ether3_writebuffer(dev,data,length)                     \
 152         writesw(REG_BUFWIN, (data), (length) >> 1)
 153
 154 #define ether3_writeword(dev,data)                              \
 155         writew((data), REG_BUFWIN)
 156
 157 #define ether3_writelong(dev,data)      {                       \
 158         void __iomem *reg_bufwin = REG_BUFWIN;                  \
 159         writew((data), reg_bufwin);                             \
 160         writew((data) >> 16, reg_bufwin);                       \
 161 }
 162
 163 /*
 164  * read data from the buffer memory
 165  */
 166 #define ether3_readbuffer(dev,data,length)                      \
 167         readsw(REG_BUFWIN, (data), (length) >> 1)
 168
 169 #define ether3_readword(dev)                                    \
 170         readw(REG_BUFWIN)
 171
 172 #define ether3_readlong(dev)                                    \
 173         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
 174
 175 /*
 176  * Switch LED off...
 177  */
 178 static void ether3_ledoff(unsigned long data)
 179 {
 180         struct net_device *dev = (struct net_device *)data;
 181         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
 182 }
 183
 184 /*
 185  * switch LED on...
 186  */
 187 static inline void ether3_ledon(struct net_device *dev)
 188 {
 189         del_timer(&priv(dev)->timer);
 190         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
 191         priv(dev)->timer.data = (unsigned long)dev;
 192         priv(dev)->timer.function = ether3_ledoff;
 193         add_timer(&priv(dev)->timer);
 194         if (priv(dev)->regs.config2 & CFG2_CTRLO)
 195                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
 196 }
 197
 198 /*
 199  * Read the ethernet address string from the on board rom.
 200  * This is an ascii string!!!
 201  */
 202 static int __init
 203 ether3_addr(char *addr, struct expansion_card *ec)
 204 {
 205         struct in_chunk_dir cd;
 206         char *s;
 207
 208         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
 209                 int i;
 210                 for (i = 0; i<6; i++) {
 211                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
 212                         if (*s != (i==5?')' : ':' ))
 213                                 break;
 214                 }
 215                 if (i == 6)
 216                         return 0;
 217         }
 218         /* I wonder if we should even let the user continue in this case
 219          *   - no, it would be better to disable the device
 220          */
 221         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
 222         return -ENODEV;
 223 }
 224
 225 /* --------------------------------------------------------------------------- */
 226
 227 static int __init
 228 ether3_ramtest(struct net_device *dev, unsigned char byte)
 229 {
 230         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
 231         int i,ret = 0;
 232         int max_errors = 4;
 233         int bad = -1;
 234
 235         if (!buffer)
 236                 return 1;
 237
 238         memset(buffer, byte, RX_END);
 239         ether3_setbuffer(dev, buffer_write, 0);
 240         ether3_writebuffer(dev, buffer, TX_END);
 241         ether3_setbuffer(dev, buffer_write, RX_START);
 242         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
 243         memset(buffer, byte ^ 0xff, RX_END);
 244         ether3_setbuffer(dev, buffer_read, 0);
 245         ether3_readbuffer(dev, buffer, TX_END);
 246         ether3_setbuffer(dev, buffer_read, RX_START);
 247         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
 248
 249         for (i = 0; i < RX_END; i++) {
 250                 if (buffer[i] != byte) {
 251                         if (max_errors > 0 && bad != buffer[i]) {
 252                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 253                                        dev->name, buffer[i], byte, i);
 254                                 ret = 2;
 255                                 max_errors--;
 256                                 bad = i;
 257                         }
 258                 } else {
 259                         if (bad != -1) {
 260                                 if (bad != i - 1)
 261                                         printk(" - 0x%04X\n", i - 1);
 262                                 printk("\n");
 263                                 bad = -1;
 264                         }
 265                 }
 266         }
 267         if (bad != -1)
 268                 printk(" - 0xffff\n");
 269         kfree(buffer);
 270
 271         return ret;
 272 }
 273
 274 /* ------------------------------------------------------------------------------- */
 275
 276 static int __init ether3_init_2(struct net_device *dev)
 277 {
 278         int i;
 279
 280         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
 281         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
 282         priv(dev)->regs.command = 0;
 283
 284         /*
 285          * Set up our hardware address
 286          */
 287         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 288         for (i = 0; i < 6; i++)
 289                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 290
 291         if (dev->flags & IFF_PROMISC)
 292                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 293         else if (dev->flags & IFF_MULTICAST)
 294                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 295         else
 296                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 297
 298         /*
 299          * There is a problem with the NQ8005 in that it occasionally loses the
 300          * last two bytes.  To get round this problem, we receive the CRC as
 301          * well.  That way, if we do lose the last two, then it doesn't matter.
 302          */
 303         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 304         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 305         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 306         ether3_outw(0, REG_TRANSMITPTR);
 307         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 308         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 309         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 310         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
 311
 312         i = ether3_ramtest(dev, 0x5A);
 313         if(i)
 314                 return i;
 315         i = ether3_ramtest(dev, 0x1E);
 316         if(i)
 317                 return i;
 318
 319         ether3_setbuffer(dev, buffer_write, 0);
 320         ether3_writelong(dev, 0);
 321         return 0;
 322 }
 323
 324 static void
 325 ether3_init_for_open(struct net_device *dev)
 326 {
 327         int i;
 328
 329         memset(&priv(dev)->stats, 0, sizeof(struct net_device_stats));
 330
 331         /* Reset the chip */
 332         ether3_outw(CFG2_RESET, REG_CONFIG2);
 333         udelay(4);
 334
 335         priv(dev)->regs.command = 0;
 336         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 337         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 338                 barrier();
 339
 340         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
 341         for (i = 0; i < 6; i++)
 342                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
 343
 344         priv(dev)->tx_head      = 0;
 345         priv(dev)->tx_tail      = 0;
 346         priv(dev)->regs.config2 |= CFG2_CTRLO;
 347         priv(dev)->rx_head      = RX_START;
 348
 349         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
 350         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
 351         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
 352         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
 353         ether3_outw(0, REG_TRANSMITPTR);
 354         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 355         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 356
 357         ether3_setbuffer(dev, buffer_write, 0);
 358         ether3_writelong(dev, 0);
 359
 360         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
 361         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 362 }
 363
 364 static inline int
 365 ether3_probe_bus_8(struct net_device *dev, int val)
 366 {
 367         int write_low, write_high, read_low, read_high;
 368
 369         write_low = val & 255;
 370         write_high = val >> 8;
 371
 372         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
 373
 374         ether3_outb(write_low, REG_RECVPTR);
 375         ether3_outb(write_high, REG_RECVPTR + 4);
 376
 377         read_low = ether3_inb(REG_RECVPTR);
 378         read_high = ether3_inb(REG_RECVPTR + 4);
 379
 380         printk(", read8 [%02X:%02X]\n", read_high, read_low);
 381
 382         return read_low == write_low && read_high == write_high;
 383 }
 384
 385 static inline int
 386 ether3_probe_bus_16(struct net_device *dev, int val)
 387 {
 388         int read_val;
 389
 390         ether3_outw(val, REG_RECVPTR);
 391         read_val = ether3_inw(REG_RECVPTR);
 392
 393         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
 394
 395         return read_val == val;
 396 }
 397
 398 /*
 399  * Open/initialize the board.  This is called (in the current kernel)
 400  * sometime after booting when the 'ifconfig' program is run.
 401  *
 402  * This routine should set everything up anew at each open, even
 403  * registers that "should" only need to be set once at boot, so that
 404  * there is non-reboot way to recover if something goes wrong.
 405  */
 406 static int
 407 ether3_open(struct net_device *dev)
 408 {
 409         if (!is_valid_ether_addr(dev->dev_addr)) {
 410                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
 411                         dev->name);
 412                 return -EINVAL;
 413         }
 414
 415         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
 416                 return -EAGAIN;
 417
 418         ether3_init_for_open(dev);
 419
 420         netif_start_queue(dev);
 421
 422         return 0;
 423 }
 424
 425 /*
 426  * The inverse routine to ether3_open().
 427  */
 428 static int
 429 ether3_close(struct net_device *dev)
 430 {
 431         netif_stop_queue(dev);
 432
 433         disable_irq(dev->irq);
 434
 435         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
 436         priv(dev)->regs.command = 0;
 437         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
 438                 barrier();
 439         ether3_outb(0x80, REG_CONFIG2 + 4);
 440         ether3_outw(0, REG_COMMAND);
 441
 442         free_irq(dev->irq, dev);
 443
 444         return 0;
 445 }
 446
 447 /*
 448  * Get the current statistics.  This may be called with the card open or
 449  * closed.
 450  */
 451 static struct net_device_stats *ether3_getstats(struct net_device *dev)
 452 {
 453         return &priv(dev)->stats;
 454 }
 455
 456 /*
 457  * Set or clear promiscuous/multicast mode filter for this adaptor.
 458  *
 459  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 460  * in which does not have the other ethernet address registers present...
 461  */
 462 static void ether3_setmulticastlist(struct net_device *dev)
 463 {
 464         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
 465
 466         if (dev->flags & IFF_PROMISC) {
 467                 /* promiscuous mode */
 468                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
 469         } else if (dev->flags & IFF_ALLMULTI) {
 470                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
 471         } else
 472                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
 473
 474         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
 475 }
 476
 477 static void ether3_timeout(struct net_device *dev)
 478 {
 479         unsigned long flags;
 480
 481         del_timer(&priv(dev)->timer);
 482
 483         local_irq_save(flags);
 484         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
 485         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
 486                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
 487         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
 488                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
 489         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
 490                 priv(dev)->tx_head, priv(dev)->tx_tail);
 491         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
 492         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
 493         local_irq_restore(flags);
 494
 495         priv(dev)->regs.config2 |= CFG2_CTRLO;
 496         priv(dev)->stats.tx_errors += 1;
 497         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
 498         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
 499
 500         netif_wake_queue(dev);
 501 }
 502
 503 /*
 504  * Transmit a packet
 505  */
 506 static int
 507 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
 508 {
 509         unsigned long flags;
 510         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 511         unsigned int ptr, next_ptr;
 512
 513         if (priv(dev)->broken) {
 514                 dev_kfree_skb(skb);
 515                 priv(dev)->stats.tx_dropped ++;
 516                 netif_start_queue(dev);
 517                 return 0;
 518         }
 519
 520         length = (length + 1) & ~1;
 521         if (length != skb->len) {
 522                 skb = skb_padto(skb, length);
 523                 if (skb == NULL)
 524                         goto out;
 525         }
 526
 527         next_ptr = (priv(dev)->tx_head + 1) & 15;
 528
 529         local_irq_save(flags);
 530
 531         if (priv(dev)->tx_tail == next_ptr) {
 532                 local_irq_restore(flags);
 533                 return 1;       /* unable to queue */
 534         }
 535
 536         dev->trans_start = jiffies;
 537         ptr              = 0x600 * priv(dev)->tx_head;
 538         priv(dev)->tx_head = next_ptr;
 539         next_ptr        *= 0x600;
 540
 541 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
 542
 543         ether3_setbuffer(dev, buffer_write, next_ptr);
 544         ether3_writelong(dev, 0);
 545         ether3_setbuffer(dev, buffer_write, ptr);
 546         ether3_writelong(dev, 0);
 547         ether3_writebuffer(dev, skb->data, length);
 548         ether3_writeword(dev, htons(next_ptr));
 549         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
 550         ether3_setbuffer(dev, buffer_write, ptr);
 551         ether3_writeword(dev, htons((ptr + length + 4)));
 552         ether3_writeword(dev, TXHDR_FLAGS >> 16);
 553         ether3_ledon(dev);
 554
 555         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
 556                 ether3_outw(ptr, REG_TRANSMITPTR);
 557                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
 558         }
 559
 560         next_ptr = (priv(dev)->tx_head + 1) & 15;
 561         local_irq_restore(flags);
 562
 563         dev_kfree_skb(skb);
 564
 565         if (priv(dev)->tx_tail == next_ptr)
 566                 netif_stop_queue(dev);
 567
 568  out:
 569         return 0;
 570 }
 571
 572 static irqreturn_t
 573 ether3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 574 {
 575         struct net_device *dev = (struct net_device *)dev_id;
 576         unsigned int status, handled = IRQ_NONE;
 577
 578 #if NET_DEBUG > 1
 579         if(net_debug & DEBUG_INT)
 580                 printk("eth3irq: %d ", irq);
 581 #endif
 582
 583         status = ether3_inw(REG_STATUS);
 584
 585         if (status & STAT_INTRX) {
 586                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
 587                 ether3_rx(dev, 12);
 588                 handled = IRQ_HANDLED;
 589         }
 590
 591         if (status & STAT_INTTX) {
 592                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
 593                 ether3_tx(dev);
 594                 handled = IRQ_HANDLED;
 595         }
 596
 597 #if NET_DEBUG > 1
 598         if(net_debug & DEBUG_INT)
 599                 printk("done\n");
 600 #endif
 601         return handled;
 602 }
 603
 604 /*
 605  * If we have a good packet(s), get it/them out of the buffers.
 606  */
 607 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
 608 {
 609         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
 610
 611         ether3_ledon(dev);
 612
 613         do {
 614                 unsigned int this_ptr, status;
 615                 unsigned char addrs[16];
 616
 617                 /*
 618                  * read the first 16 bytes from the buffer.
 619                  * This contains the status bytes etc and ethernet addresses,
 620                  * and we also check the source ethernet address to see if
 621                  * it originated from us.
 622                  */
 623                 {
 624                         unsigned int temp_ptr;
 625                         ether3_setbuffer(dev, buffer_read, next_ptr);
 626                         temp_ptr = ether3_readword(dev);
 627                         status = ether3_readword(dev);
 628                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
 629                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
 630                                 break;
 631
 632                         this_ptr = next_ptr + 4;
 633                         next_ptr = ntohs(temp_ptr);
 634                 }
 635                 ether3_setbuffer(dev, buffer_read, this_ptr);
 636                 ether3_readbuffer(dev, addrs+2, 12);
 637
 638 if (next_ptr < RX_START || next_ptr >= RX_END) {
 639  int i;
 640  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 641  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 642  for (i = 2; i < 14; i++)
 643    printk("%02X ", addrs[i]);
 644  printk("\n");
 645  next_ptr = priv(dev)->rx_head;
 646  break;
 647 }
 648                 /*
 649                  * ignore our own packets...
 650                  */
 651                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
 652                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
 653                         maxcnt ++; /* compensate for loopedback packet */
 654                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 655                 } else
 656                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
 657                         unsigned int length = next_ptr - this_ptr;
 658                         struct sk_buff *skb;
 659
 660                         if (next_ptr <= this_ptr)
 661                                 length += RX_END - RX_START;
 662
 663                         skb = dev_alloc_skb(length + 2);
 664                         if (skb) {
 665                                 unsigned char *buf;
 666
 667                                 skb->dev = dev;
 668                                 skb_reserve(skb, 2);
 669                                 buf = skb_put(skb, length);
 670                                 ether3_readbuffer(dev, buf + 12, length - 12);
 671                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
 672                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
 673                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
 674                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
 675                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
 676                                 skb->protocol = eth_type_trans(skb, dev);
 677                                 netif_rx(skb);
 678                                 received ++;
 679                         } else
 680                                 goto dropping;
 681                 } else {
 682                         struct net_device_stats *stats = &priv(dev)->stats;
 683                         ether3_outw(next_ptr >> 8, REG_RECVEND);
 684                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
 685                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
 686                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
 687                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
 688                         stats->rx_errors++;
 689                 }
 690         }
 691         while (-- maxcnt);
 692
 693 done:
 694         priv(dev)->stats.rx_packets += received;
 695         priv(dev)->rx_head = next_ptr;
 696         /*
 697          * If rx went off line, then that means that the buffer may be full.  We
 698          * have dropped at least one packet.
 699          */
 700         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
 701                 priv(dev)->stats.rx_dropped ++;
 702                 ether3_outw(next_ptr, REG_RECVPTR);
 703                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
 704         }
 705
 706         return maxcnt;
 707
 708 dropping:{
 709         static unsigned long last_warned;
 710
 711         ether3_outw(next_ptr >> 8, REG_RECVEND);
 712         /*
 713          * Don't print this message too many times...
 714          */
 715         if (time_after(jiffies, last_warned + 10 * HZ)) {
 716                 last_warned = jiffies;
 717                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
 718         }
 719         priv(dev)->stats.rx_dropped ++;
 720         goto done;
 721         }
 722 }
 723
 724 /*
 725  * Update stats for the transmitted packet(s)
 726  */
 727 static void ether3_tx(struct net_device *dev)
 728 {
 729         unsigned int tx_tail = priv(dev)->tx_tail;
 730         int max_work = 14;
 731
 732         do {
 733                 unsigned long status;
 734
 735                 /*
 736                  * Read the packet header
 737                  */
 738                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
 739                 status = ether3_readlong(dev);
 740
 741                 /*
 742                  * Check to see if this packet has been transmitted
 743                  */
 744                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
 745                     (TXSTAT_DONE | TXHDR_TRANSMIT))
 746                         break;
 747
 748                 /*
 749                  * Update errors
 750                  */
 751                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
 752                         priv(dev)->stats.tx_packets++;
 753                 else {
 754                         priv(dev)->stats.tx_errors ++;
 755                         if (status & TXSTAT_16COLLISIONS)
 756                                 priv(dev)->stats.collisions += 16;
 757                         if (status & TXSTAT_BABBLED)
 758                                 priv(dev)->stats.tx_fifo_errors ++;
 759                 }
 760
 761                 tx_tail = (tx_tail + 1) & 15;
 762         } while (--max_work);
 763
 764         if (priv(dev)->tx_tail != tx_tail) {
 765                 priv(dev)->tx_tail = tx_tail;
 766                 netif_wake_queue(dev);
 767         }
 768 }
 769
 770 static void __init ether3_banner(void)
 771 {
 772         static unsigned version_printed = 0;
 773
 774         if (net_debug && version_printed++ == 0)
 775                 printk(KERN_INFO "%s", version);
 776 }
 777
 778 static int __devinit
 779 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 780 {
 781         const struct ether3_data *data = id->data;
 782         struct net_device *dev;
 783         int i, bus_type, ret;
 784
 785         ether3_banner();
 786
 787         ret = ecard_request_resources(ec);
 788         if (ret)
 789                 goto out;
 790
 791         dev = alloc_etherdev(sizeof(struct dev_priv));
 792         if (!dev) {
 793                 ret = -ENOMEM;
 794                 goto release;
 795         }
 796
 797         SET_MODULE_OWNER(dev);
 798         SET_NETDEV_DEV(dev, &ec->dev);
 799
 800         priv(dev)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
 801                                   ecard_resource_len(ec, ECARD_RES_MEMC));
 802         if (!priv(dev)->base) {
 803                 ret = -ENOMEM;
 804                 goto free;
 805         }
 806
 807         ec->irqaddr = priv(dev)->base + data->base_offset;
 808         ec->irqmask = 0xf0;
 809
 810         priv(dev)->seeq = priv(dev)->base + data->base_offset;
 811         dev->irq = ec->irq;
 812
 813         ether3_addr(dev->dev_addr, ec);
 814
 815         init_timer(&priv(dev)->timer);
 816
 817         /* Reset card...
 818          */
 819         ether3_outb(0x80, REG_CONFIG2 + 4);
 820         bus_type = BUS_UNKNOWN;
 821         udelay(4);
 822
 823         /* Test using Receive Pointer (16-bit register) to find out
 824          * how the ether3 is connected to the bus...
 825          */
 826         if (ether3_probe_bus_8(dev, 0x100) &&
 827             ether3_probe_bus_8(dev, 0x201))
 828                 bus_type = BUS_8;
 829
 830         if (bus_type == BUS_UNKNOWN &&
 831             ether3_probe_bus_16(dev, 0x101) &&
 832             ether3_probe_bus_16(dev, 0x201))
 833                 bus_type = BUS_16;
 834
 835         switch (bus_type) {
 836         case BUS_UNKNOWN:
 837                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
 838                 ret = -ENODEV;
 839                 goto free;
 840
 841         case BUS_8:
 842                 printk(KERN_ERR "%s: %s found, but is an unsupported "
 843                         "8-bit card\n", dev->name, data->name);
 844                 ret = -ENODEV;
 845                 goto free;
 846
 847         default:
 848                 break;
 849         }
 850
 851         if (ether3_init_2(dev)) {
 852                 ret = -ENODEV;
 853                 goto free;
 854         }
 855
 856         dev->open               = ether3_open;
 857         dev->stop               = ether3_close;
 858         dev->hard_start_xmit    = ether3_sendpacket;
 859         dev->get_stats          = ether3_getstats;
 860         dev->set_multicast_list = ether3_setmulticastlist;
 861         dev->tx_timeout         = ether3_timeout;
 862         dev->watchdog_timeo     = 5 * HZ / 100;
 863
 864         ret = register_netdev(dev);
 865         if (ret)
 866                 goto free;
 867
 868         printk("%s: %s in slot %d, ", dev->name, data->name, ec->slot_no);
 869         for (i = 0; i < 6; i++)
 870                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 871
 872         ecard_set_drvdata(ec, dev);
 873         return 0;
 874
 875  free:
 876         if (priv(dev)->base)
 877                 iounmap(priv(dev)->base);
 878         free_netdev(dev);
 879  release:
 880         ecard_release_resources(ec);
 881  out:
 882         return ret;
 883 }
 884
 885 static void __devexit ether3_remove(struct expansion_card *ec)
 886 {
 887         struct net_device *dev = ecard_get_drvdata(ec);
 888
 889         ecard_set_drvdata(ec, NULL);
 890
 891         unregister_netdev(dev);
 892         iounmap(priv(dev)->base);
 893         free_netdev(dev);
 894         ecard_release_resources(ec);
 895 }
 896
 897 static struct ether3_data ether3 = {
 898         .name           = "ether3",
 899         .base_offset    = 0,
 900 };
 901
 902 static struct ether3_data etherb = {
 903         .name           = "etherb",
 904         .base_offset    = 0x800,
 905 };
 906
 907 static const struct ecard_id ether3_ids[] = {
 908         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
 909         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
 910         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
 911         { 0xffff, 0xffff }
 912 };
 913
 914 static struct ecard_driver ether3_driver = {
 915         .probe          = ether3_probe,
 916         .remove         = __devexit_p(ether3_remove),
 917         .id_table       = ether3_ids,
 918         .drv = {
 919                 .name   = "ether3",
 920         },
 921 };
 922
 923 static int __init ether3_init(void)
 924 {
 925         return ecard_register_driver(&ether3_driver);
 926 }
 927
 928 static void __exit ether3_exit(void)
 929 {
 930         ecard_remove_driver(&ether3_driver);
 931 }
 932
 933 module_init(ether3_init);
 934 module_exit(ether3_exit);
 935
 936 MODULE_LICENSE("GPL");