drivers/net/ne2k-pci.c

   1 /* ne2k-pci.c: A NE2000 clone on PCI bus driver for Linux. */
   2 /*
   3         A Linux device driver for PCI NE2000 clones.
   4
   5         Authorship and other copyrights:
   6         1992-1998 by Donald Becker, NE2000 core and various modifications.
   7         1995-1998 by Paul Gortmaker, core modifications and PCI support.
   8
   9         Copyright 1993 assigned to the United States Government as represented
  10         by the Director, National Security Agency.
  11
  12         This software may be used and distributed according to the terms
  13         of the GNU Public License, incorporated herein by reference.
  14
  15         The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
  16         Center of Excellence in Space Data and Information Sciences
  17         Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
  18
  19         People are making PCI ne2000 clones! Oh the horror, the horror...
  20
  21         Issues remaining:
  22         No full-duplex support.
  23 */
  24
  25 /* Our copyright info must remain in the binary. */
  26 static const char *version =
  27 "ne2k-pci.c:vpre-1.00e 5/27/99 D. Becker/P. Gortmaker http://cesdis.gsfc.nasa.gov/linux/drivers/ne2k-pci.html\n";
  28
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/sched.h>
  32 #include <linux/errno.h>
  33 #include <linux/pci.h>
  34 #include <linux/init.h>
  35
  36 #include <asm/system.h>
  37 #include <asm/io.h>
  38 #include <asm/irq.h>
  39
  40 #include <linux/netdevice.h>
  41 #include <linux/etherdevice.h>
  42 #include "8390.h"
  43
  44 #if defined(__powerpc__)
  45 #define inl_le(addr)  le32_to_cpu(inl(addr))
  46 #define inw_le(addr)  le16_to_cpu(inw(addr))
  47 #define insl insl_ns
  48 #define outsl outsl_ns
  49 #endif
  50
  51 /* Set statically or when loading the driver module. */
  52 static int debug = 1;
  53
  54 /* Some defines that people can play with if so inclined. */
  55
  56 /* Use 32 bit data-movement operations instead of 16 bit. */
  57 #define USE_LONGIO
  58
  59 /* Do we implement the read before write bugfix ? */
  60 /* #define NE_RW_BUGFIX */
  61
  62 /* Do we have a non std. amount of memory? (in units of 256 byte pages) */
  63 /* #define PACKETBUF_MEMSIZE    0x40 */
  64
  65 #define ne2k_flags reg0                 /* Rename an existing field to store flags! */
  66
  67 /* Only the low 8 bits are usable for non-init-time flags! */
  68 enum {
  69         HOLTEK_FDX=1,           /* Full duplex -> set 0x80 at offset 0x20. */
  70         ONLY_16BIT_IO=2, ONLY_32BIT_IO=4,       /* Chip can do only 16/32-bit xfers. */
  71         STOP_PG_0x60=0x100,
  72 };
  73
  74 /* This will eventually be converted to the standard PCI probe table. */
  75
  76 static struct {
  77         unsigned short vendor, dev_id;
  78         char *name;
  79         int flags;
  80 }
  81 pci_clone_list[] __initdata = {
  82         {0x10ec, 0x8029, "RealTek RTL-8029", 0},
  83         {0x1050, 0x0940, "Winbond 89C940", 0},
  84         {0x11f6, 0x1401, "Compex RL2000", 0},
  85         {0x8e2e, 0x3000, "KTI ET32P2", 0},
  86         {0x4a14, 0x5000, "NetVin NV5000SC", 0},
  87         {0x1106, 0x0926, "Via 86C926", ONLY_16BIT_IO},
  88         {0x10bd, 0x0e34, "SureCom NE34", 0},
  89         {0x1050, 0x5a5a, "Winbond W89C940F", 0},
  90         {0x12c3, 0x0058, "Holtek HT80232", ONLY_16BIT_IO | HOLTEK_FDX},
  91         {0x12c3, 0x5598, "Holtek HT80229",
  92          ONLY_32BIT_IO | HOLTEK_FDX | STOP_PG_0x60 },
  93         {0,}
  94 };
  95
  96 /* ---- No user-serviceable parts below ---- */
  97
  98 #define NE_BASE  (dev->base_addr)
  99 #define NE_CMD          0x00
 100 #define NE_DATAPORT     0x10    /* NatSemi-defined port window offset. */
 101 #define NE_RESET        0x1f    /* Issue a read to reset, a write to clear. */
 102 #define NE_IO_EXTENT    0x20
 103
 104 #define NESM_START_PG   0x40    /* First page of TX buffer */
 105 #define NESM_STOP_PG    0x80    /* Last page +1 of RX ring */
 106
 107 int ne2k_pci_probe(struct net_device *dev);
 108 static struct net_device *ne2k_pci_probe1(struct net_device *dev, long ioaddr, int irq,
 109                                                                           int chip_idx);
 110
 111 static int ne2k_pci_open(struct net_device *dev);
 112 static int ne2k_pci_close(struct net_device *dev);
 113
 114 static void ne2k_pci_reset_8390(struct net_device *dev);
 115 static void ne2k_pci_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
 116                           int ring_page);
 117 static void ne2k_pci_block_input(struct net_device *dev, int count,
 118                           struct sk_buff *skb, int ring_offset);
 119 static void ne2k_pci_block_output(struct net_device *dev, const int count,
 120                 const unsigned char *buf, const int start_page);
 121
 122 \f
 123
 124 /* No room in the standard 8390 structure for extra info we need. */
 125 struct ne2k_pci_card {
 126         struct ne2k_pci_card *next;
 127         struct net_device *dev;
 128         struct pci_dev *pci_dev;
 129 };
 130 /* A list of all installed devices, for removing the driver module. */
 131 static struct ne2k_pci_card *ne2k_card_list = NULL;
 132
 133 #ifdef MODULE
 134
 135 int
 136 init_module(void)
 137 {
 138         /* We must emit version information. */
 139         if (debug)
 140                 printk(KERN_INFO "%s", version);
 141
 142         if (ne2k_pci_probe(0)) {
 143                 printk(KERN_NOTICE "ne2k-pci.c: No useable cards found, driver NOT installed.\n");
 144                 return -ENODEV;
 145         }
 146         lock_8390_module();
 147         return 0;
 148 }
 149
 150 void
 151 cleanup_module(void)
 152 {
 153         struct net_device *dev;
 154         struct ne2k_pci_card *this_card;
 155
 156         /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
 157         while (ne2k_card_list) {
 158                 dev = ne2k_card_list->dev;
 159                 unregister_netdev(dev);
 160                 release_region(dev->base_addr, NE_IO_EXTENT);
 161                 kfree(dev);
 162                 this_card = ne2k_card_list;
 163                 ne2k_card_list = ne2k_card_list->next;
 164                 kfree(this_card);
 165         }
 166         unlock_8390_module();
 167 }
 168
 169 #endif  /* MODULE */
 170
 171 /*
 172   NEx000-clone boards have a Station Address (SA) PROM (SAPROM) in the packet
 173   buffer memory space.  By-the-spec NE2000 clones have 0x57,0x57 in bytes
 174   0x0e,0x0f of the SAPROM, while other supposed NE2000 clones must be
 175   detected by their SA prefix.
 176
 177   Reading the SAPROM from a word-wide card with the 8390 set in byte-wide
 178   mode results in doubled values, which can be detected and compensated for.
 179
 180   The probe is also responsible for initializing the card and filling
 181   in the 'dev' and 'ei_status' structures.
 182 */
 183
 184 #ifdef HAVE_DEVLIST
 185 struct netdev_entry netcard_drv =
 186 {"ne2k_pci", ne2k_pci_probe1, NE_IO_EXTENT, 0};
 187 #endif
 188
 189 int __init ne2k_pci_probe(struct net_device *dev)
 190 {
 191         struct pci_dev *pdev = NULL;
 192         int cards_found = 0;
 193         int i;
 194
 195         if ( ! pci_present())
 196                 return -ENODEV;
 197
 198         while ((pdev = pci_find_class(PCI_CLASS_NETWORK_ETHERNET << 8, pdev)) != NULL) {
 199                 int pci_irq_line;
 200                 u16 pci_command, new_command;
 201                 unsigned long pci_ioaddr;
 202
 203                 /* Note: some vendor IDs (RealTek) have non-NE2k cards as well. */
 204                 for (i = 0; pci_clone_list[i].vendor != 0; i++)
 205                         if (pci_clone_list[i].vendor == pdev->vendor
 206                                 && pci_clone_list[i].dev_id == pdev->device)
 207                                 break;
 208                 if (pci_clone_list[i].vendor == 0)
 209                         continue;
 210
 211                 pci_ioaddr = pdev->resource[0].start;
 212                 pci_irq_line = pdev->irq;
 213                 pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
 214
 215                 /* Avoid already found cards from previous calls */
 216                 if (check_region(pci_ioaddr, NE_IO_EXTENT))
 217                         continue;
 218
 219 #ifndef MODULE
 220                 {
 221                         static unsigned version_printed = 0;
 222                         if (version_printed++ == 0)
 223                                 printk(KERN_INFO "%s", version);
 224                 }
 225 #endif
 226
 227                 /* Activate the card: fix for brain-damaged Win98 BIOSes. */
 228                 new_command = pci_command | PCI_COMMAND_IO;
 229                 if (pci_command != new_command) {
 230                         printk(KERN_INFO "  The PCI BIOS has not enabled this"
 231                                    " NE2k clone!  Updating PCI command %4.4x->%4.4x.\n",
 232                                    pci_command, new_command);
 233                         pci_write_config_word(pdev, PCI_COMMAND, new_command);
 234                 }
 235 #ifndef __sparc__
 236                 if (pci_irq_line <= 0 || pci_irq_line >= NR_IRQS)
 237                         printk(KERN_WARNING "  WARNING: The PCI BIOS assigned this PCI NE2k"
 238                                    " card to IRQ %d, which is unlikely to work!.\n"
 239                                    KERN_WARNING " You should use the PCI BIOS setup to assign"
 240                                    " a valid IRQ line.\n", pci_irq_line);
 241 #endif
 242                 printk("ne2k-pci.c: PCI NE2000 clone '%s' at I/O %#lx, IRQ %d.\n",
 243                            pci_clone_list[i].name, pci_ioaddr, pci_irq_line);
 244                 dev = ne2k_pci_probe1(dev, pci_ioaddr, pci_irq_line, i);
 245                 if (dev == 0) {
 246                         /* Should not happen. */
 247                         printk(KERN_ERR "ne2k-pci: Probe of PCI card at %#lx failed.\n",
 248                                    pci_ioaddr);
 249                         continue;
 250                 } else {
 251                         struct ne2k_pci_card *ne2k_card =
 252                                 kmalloc(sizeof(struct ne2k_pci_card), GFP_KERNEL);
 253                         ne2k_card->next = ne2k_card_list;
 254                         ne2k_card_list = ne2k_card;
 255                         ne2k_card->dev = dev;
 256                         ne2k_card->pci_dev = pdev;
 257                 }
 258                 dev = 0;
 259
 260                 cards_found++;
 261         }
 262
 263         return cards_found ? 0 : -ENODEV;
 264 }
 265
 266 static struct net_device __init *ne2k_pci_probe1(struct net_device *dev, long ioaddr, int irq, int chip_idx)
 267 {
 268         int i;
 269         unsigned char SA_prom[32];
 270         int start_page, stop_page;
 271         int reg0 = inb(ioaddr);
 272
 273         if (reg0 == 0xFF)
 274                 return 0;
 275
 276         /* Do a preliminary verification that we have a 8390. */
 277         {
 278                 int regd;
 279                 outb(E8390_NODMA+E8390_PAGE1+E8390_STOP, ioaddr + E8390_CMD);
 280                 regd = inb(ioaddr + 0x0d);
 281                 outb(0xff, ioaddr + 0x0d);
 282                 outb(E8390_NODMA+E8390_PAGE0, ioaddr + E8390_CMD);
 283                 inb(ioaddr + EN0_COUNTER0); /* Clear the counter by reading. */
 284                 if (inb(ioaddr + EN0_COUNTER0) != 0) {
 285                         outb(reg0, ioaddr);
 286                         outb(regd, ioaddr + 0x0d);      /* Restore the old values. */
 287                         return 0;
 288                 }
 289         }
 290
 291         dev = init_etherdev(dev, 0);
 292
 293         /* Reset card. Who knows what dain-bramaged state it was left in. */
 294         {
 295                 unsigned long reset_start_time = jiffies;
 296
 297                 outb(inb(ioaddr + NE_RESET), ioaddr + NE_RESET);
 298
 299                 /* This looks like a horrible timing loop, but it should never take
 300                    more than a few cycles.
 301                 */
 302                 while ((inb(ioaddr + EN0_ISR) & ENISR_RESET) == 0)
 303                         /* Limit wait: '2' avoids jiffy roll-over. */
 304                         if (jiffies - reset_start_time > 2) {
 305                                 printk("ne2k-pci: Card failure (no reset ack).\n");
 306                                 return 0;
 307                         }
 308
 309                 outb(0xff, ioaddr + EN0_ISR);           /* Ack all intr. */
 310         }
 311
 312         if (load_8390_module("ne2k-pci.c")) {
 313                 return 0;
 314         }
 315
 316         /* Read the 16 bytes of station address PROM.
 317            We must first initialize registers, similar to NS8390_init(eifdev, 0).
 318            We can't reliably read the SAPROM address without this.
 319            (I learned the hard way!). */
 320         {
 321                 struct {unsigned char value, offset; } program_seq[] = {
 322                         {E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, /* Select page 0*/
 323                         {0x49,  EN0_DCFG},      /* Set word-wide access. */
 324                         {0x00,  EN0_RCNTLO},    /* Clear the count regs. */
 325                         {0x00,  EN0_RCNTHI},
 326                         {0x00,  EN0_IMR},       /* Mask completion irq. */
 327                         {0xFF,  EN0_ISR},
 328                         {E8390_RXOFF, EN0_RXCR},        /* 0x20  Set to monitor */
 329                         {E8390_TXOFF, EN0_TXCR},        /* 0x02  and loopback mode. */
 330                         {32,    EN0_RCNTLO},
 331                         {0x00,  EN0_RCNTHI},
 332                         {0x00,  EN0_RSARLO},    /* DMA starting at 0x0000. */
 333                         {0x00,  EN0_RSARHI},
 334                         {E8390_RREAD+E8390_START, E8390_CMD},
 335                 };
 336                 for (i = 0; i < sizeof(program_seq)/sizeof(program_seq[0]); i++)
 337                         outb(program_seq[i].value, ioaddr + program_seq[i].offset);
 338
 339         }
 340
 341         /* Note: all PCI cards have at least 16 bit access, so we don't have
 342            to check for 8 bit cards.  Most cards permit 32 bit access. */
 343         if (pci_clone_list[chip_idx].flags & ONLY_32BIT_IO) {
 344                 for (i = 0; i < 4 ; i++)
 345                         ((u32 *)SA_prom)[i] = le32_to_cpu(inl(ioaddr + NE_DATAPORT));
 346         } else
 347                 for(i = 0; i < 32 /*sizeof(SA_prom)*/; i++)
 348                         SA_prom[i] = inb(ioaddr + NE_DATAPORT);
 349
 350         /* We always set the 8390 registers for word mode. */
 351         outb(0x49, ioaddr + EN0_DCFG);
 352         start_page = NESM_START_PG;
 353
 354         stop_page =
 355                 pci_clone_list[chip_idx].flags&STOP_PG_0x60 ? 0x60 : NESM_STOP_PG;
 356
 357         /* Set up the rest of the parameters. */
 358         dev->irq = irq;
 359         dev->base_addr = ioaddr;
 360
 361         /* Allocate dev->priv and fill in 8390 specific dev fields. */
 362         if (ethdev_init(dev)) {
 363                 printk ("%s: unable to get memory for dev->priv.\n", dev->name);
 364                 return 0;
 365         }
 366
 367         request_region(ioaddr, NE_IO_EXTENT, dev->name);
 368
 369         printk("%s: %s found at %#lx, IRQ %d, ",
 370                    dev->name, pci_clone_list[chip_idx].name, ioaddr, dev->irq);
 371         for(i = 0; i < 6; i++) {
 372                 printk("%2.2X%s", SA_prom[i], i == 5 ? ".\n": ":");
 373                 dev->dev_addr[i] = SA_prom[i];
 374         }
 375
 376         ei_status.name = pci_clone_list[chip_idx].name;
 377         ei_status.tx_start_page = start_page;
 378         ei_status.stop_page = stop_page;
 379         ei_status.word16 = 1;
 380         ei_status.ne2k_flags = pci_clone_list[chip_idx].flags;
 381
 382         ei_status.rx_start_page = start_page + TX_PAGES;
 383 #ifdef PACKETBUF_MEMSIZE
 384         /* Allow the packet buffer size to be overridden by know-it-alls. */
 385         ei_status.stop_page = ei_status.tx_start_page + PACKETBUF_MEMSIZE;
 386 #endif
 387
 388         ei_status.reset_8390 = &ne2k_pci_reset_8390;
 389         ei_status.block_input = &ne2k_pci_block_input;
 390         ei_status.block_output = &ne2k_pci_block_output;
 391         ei_status.get_8390_hdr = &ne2k_pci_get_8390_hdr;
 392         dev->open = &ne2k_pci_open;
 393         dev->stop = &ne2k_pci_close;
 394         NS8390_init(dev, 0);
 395         return dev;
 396 }
 397
 398 static int
 399 ne2k_pci_open(struct net_device *dev)
 400 {
 401         if (request_irq(dev->irq, ei_interrupt, SA_SHIRQ, dev->name, dev))
 402                 return -EAGAIN;
 403         ei_open(dev);
 404         MOD_INC_USE_COUNT;
 405         return 0;
 406 }
 407
 408 static int
 409 ne2k_pci_close(struct net_device *dev)
 410 {
 411         ei_close(dev);
 412         free_irq(dev->irq, dev);
 413         MOD_DEC_USE_COUNT;
 414         return 0;
 415 }
 416
 417 /* Hard reset the card.  This used to pause for the same period that a
 418    8390 reset command required, but that shouldn't be necessary. */
 419 static void
 420 ne2k_pci_reset_8390(struct net_device *dev)
 421 {
 422         unsigned long reset_start_time = jiffies;
 423
 424         if (debug > 1) printk("%s: Resetting the 8390 t=%ld...",
 425                                                   dev->name, jiffies);
 426
 427         outb(inb(NE_BASE + NE_RESET), NE_BASE + NE_RESET);
 428
 429         ei_status.txing = 0;
 430         ei_status.dmaing = 0;
 431
 432         /* This check _should_not_ be necessary, omit eventually. */
 433         while ((inb(NE_BASE+EN0_ISR) & ENISR_RESET) == 0)
 434                 if (jiffies - reset_start_time > 2) {
 435                         printk("%s: ne2k_pci_reset_8390() did not complete.\n", dev->name);
 436                         break;
 437                 }
 438         outb(ENISR_RESET, NE_BASE + EN0_ISR);   /* Ack intr. */
 439 }
 440
 441 /* Grab the 8390 specific header. Similar to the block_input routine, but
 442    we don't need to be concerned with ring wrap as the header will be at
 443    the start of a page, so we optimize accordingly. */
 444
 445 static void
 446 ne2k_pci_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
 447 {
 448
 449         long nic_base = dev->base_addr;
 450
 451         /* This *shouldn't* happen. If it does, it's the last thing you'll see */
 452         if (ei_status.dmaing) {
 453                 printk("%s: DMAing conflict in ne2k_pci_get_8390_hdr "
 454                            "[DMAstat:%d][irqlock:%d][intr:%d].\n",
 455                            dev->name, ei_status.dmaing, ei_status.irqlock,
 456                            (int)dev->interrupt);
 457                 return;
 458         }
 459
 460         ei_status.dmaing |= 0x01;
 461         outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
 462         outb(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
 463         outb(0, nic_base + EN0_RCNTHI);
 464         outb(0, nic_base + EN0_RSARLO);         /* On page boundary */
 465         outb(ring_page, nic_base + EN0_RSARHI);
 466         outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
 467
 468         if (ei_status.ne2k_flags & ONLY_16BIT_IO) {
 469                 insw(NE_BASE + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
 470         } else {
 471                 *(u32*)hdr = le32_to_cpu(inl(NE_BASE + NE_DATAPORT));
 472                 le16_to_cpus(&hdr->count);
 473         }
 474
 475         outb(ENISR_RDC, nic_base + EN0_ISR);    /* Ack intr. */
 476         ei_status.dmaing &= ~0x01;
 477 }
 478
 479 /* Block input and output, similar to the Crynwr packet driver.  If you
 480    are porting to a new ethercard, look at the packet driver source for hints.
 481    The NEx000 doesn't share the on-board packet memory -- you have to put
 482    the packet out through the "remote DMA" dataport using outb. */
 483
 484 static void
 485 ne2k_pci_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
 486 {
 487         long nic_base = dev->base_addr;
 488         char *buf = skb->data;
 489
 490         /* This *shouldn't* happen. If it does, it's the last thing you'll see */
 491         if (ei_status.dmaing) {
 492                 printk("%s: DMAing conflict in ne2k_pci_block_input "
 493                            "[DMAstat:%d][irqlock:%d][intr:%d].\n",
 494                            dev->name, ei_status.dmaing, ei_status.irqlock,
 495                            (int)dev->interrupt);
 496                 return;
 497         }
 498         ei_status.dmaing |= 0x01;
 499         if (ei_status.ne2k_flags & ONLY_32BIT_IO)
 500                 count = (count + 3) & 0xFFFC;
 501         outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
 502         outb(count & 0xff, nic_base + EN0_RCNTLO);
 503         outb(count >> 8, nic_base + EN0_RCNTHI);
 504         outb(ring_offset & 0xff, nic_base + EN0_RSARLO);
 505         outb(ring_offset >> 8, nic_base + EN0_RSARHI);
 506         outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
 507
 508         if (ei_status.ne2k_flags & ONLY_16BIT_IO) {
 509                 insw(NE_BASE + NE_DATAPORT,buf,count>>1);
 510                 if (count & 0x01) {
 511                         buf[count-1] = inb(NE_BASE + NE_DATAPORT);
 512                 }
 513         } else {
 514                 insl(NE_BASE + NE_DATAPORT, buf, count>>2);
 515                 if (count & 3) {
 516                         buf += count & ~3;
 517                         if (count & 2)
 518                                 *((u16*)buf)++ = le16_to_cpu(inw(NE_BASE + NE_DATAPORT));
 519                         if (count & 1)
 520                                 *buf = inb(NE_BASE + NE_DATAPORT);
 521                 }
 522         }
 523
 524         outb(ENISR_RDC, nic_base + EN0_ISR);    /* Ack intr. */
 525         ei_status.dmaing &= ~0x01;
 526 }
 527
 528 static void
 529 ne2k_pci_block_output(struct net_device *dev, int count,
 530                 const unsigned char *buf, const int start_page)
 531 {
 532         long nic_base = NE_BASE;
 533         unsigned long dma_start;
 534
 535         /* On little-endian it's always safe to round the count up for
 536            word writes. */
 537         if (ei_status.ne2k_flags & ONLY_32BIT_IO)
 538                 count = (count + 3) & 0xFFFC;
 539         else
 540                 if (count & 0x01)
 541                         count++;
 542
 543         /* This *shouldn't* happen. If it does, it's the last thing you'll see */
 544         if (ei_status.dmaing) {
 545                 printk("%s: DMAing conflict in ne2k_pci_block_output."
 546                            "[DMAstat:%d][irqlock:%d][intr:%d]\n",
 547                            dev->name, ei_status.dmaing, ei_status.irqlock,
 548                            (int)dev->interrupt);
 549                 return;
 550         }
 551         ei_status.dmaing |= 0x01;
 552         /* We should already be in page 0, but to be safe... */
 553         outb(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);
 554
 555 #ifdef NE8390_RW_BUGFIX
 556         /* Handle the read-before-write bug the same way as the
 557            Crynwr packet driver -- the NatSemi method doesn't work.
 558            Actually this doesn't always work either, but if you have
 559            problems with your NEx000 this is better than nothing! */
 560         outb(0x42, nic_base + EN0_RCNTLO);
 561         outb(0x00, nic_base + EN0_RCNTHI);
 562         outb(0x42, nic_base + EN0_RSARLO);
 563         outb(0x00, nic_base + EN0_RSARHI);
 564         outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
 565 #endif
 566         outb(ENISR_RDC, nic_base + EN0_ISR);
 567
 568    /* Now the normal output. */
 569         outb(count & 0xff, nic_base + EN0_RCNTLO);
 570         outb(count >> 8,   nic_base + EN0_RCNTHI);
 571         outb(0x00, nic_base + EN0_RSARLO);
 572         outb(start_page, nic_base + EN0_RSARHI);
 573         outb(E8390_RWRITE+E8390_START, nic_base + NE_CMD);
 574         if (ei_status.ne2k_flags & ONLY_16BIT_IO) {
 575                 outsw(NE_BASE + NE_DATAPORT, buf, count>>1);
 576         } else {
 577                 outsl(NE_BASE + NE_DATAPORT, buf, count>>2);
 578                 if (count & 3) {
 579                         buf += count & ~3;
 580                         if (count & 2)
 581                                 outw(cpu_to_le16(*((u16*)buf)++), NE_BASE + NE_DATAPORT);
 582                 }
 583         }
 584
 585         dma_start = jiffies;
 586
 587         while ((inb(nic_base + EN0_ISR) & ENISR_RDC) == 0)
 588                 if (jiffies - dma_start > 2) {                  /* Avoid clock roll-over. */
 589                         printk("%s: timeout waiting for Tx RDC.\n", dev->name);
 590                         ne2k_pci_reset_8390(dev);
 591                         NS8390_init(dev,1);
 592                         break;
 593                 }
 594
 595         outb(ENISR_RDC, nic_base + EN0_ISR);    /* Ack intr. */
 596         ei_status.dmaing &= ~0x01;
 597         return;
 598 }
 599
 600 \f
 601 /*
 602  * Local variables:
 603  *  compile-command: "gcc -DMODVERSIONS  -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer -I/usr/src/linux/drivers/net/ -c ne2k-pci.c"
 604  *  alt-compile-command: "gcc -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer -I/usr/src/linux/drivers/net/ -c ne2k-pci.c"
 605  *  c-indent-level: 4
 606  *  c-basic-offset: 4
 607  *  tab-width: 4
 608  *  version-control: t
 609  *  kept-new-versions: 5
 610  * End:
 611  */