drivers/net/ethernet/i825xx/eexpress.c

   1 /* Intel EtherExpress 16 device driver for Linux
   2  *
   3  * Written by John Sullivan, 1995
   4  *  based on original code by Donald Becker, with changes by
   5  *  Alan Cox and Pauline Middelink.
   6  *
   7  * Support for 8-bit mode by Zoltan Szilagyi <zoltans@cs.arizona.edu>
   8  *
   9  * Many modifications, and currently maintained, by
  10  *  Philip Blundell <philb@gnu.org>
  11  * Added the Compaq LTE  Alan Cox <alan@lxorguk.ukuu.org.uk>
  12  * Added MCA support Adam Fritzler (now deleted)
  13  *
  14  * Note - this driver is experimental still - it has problems on faster
  15  * machines. Someone needs to sit down and go through it line by line with
  16  * a databook...
  17  */
  18
  19 /* The EtherExpress 16 is a fairly simple card, based on a shared-memory
  20  * design using the i82586 Ethernet coprocessor.  It bears no relationship,
  21  * as far as I know, to the similarly-named "EtherExpress Pro" range.
  22  *
  23  * Historically, Linux support for these cards has been very bad.  However,
  24  * things seem to be getting better slowly.
  25  */
  26
  27 /* If your card is confused about what sort of interface it has (eg it
  28  * persistently reports "10baseT" when none is fitted), running 'SOFTSET /BART'
  29  * or 'SOFTSET /LISA' from DOS seems to help.
  30  */
  31
  32 /* Here's the scoop on memory mapping.
  33  *
  34  * There are three ways to access EtherExpress card memory: either using the
  35  * shared-memory mapping, or using PIO through the dataport, or using PIO
  36  * through the "shadow memory" ports.
  37  *
  38  * The shadow memory system works by having the card map some of its memory
  39  * as follows:
  40  *
  41  * (the low five bits of the SMPTR are ignored)
  42  *
  43  *  base+0x4000..400f      memory at SMPTR+0..15
  44  *  base+0x8000..800f      memory at SMPTR+16..31
  45  *  base+0xc000..c007      dubious stuff (memory at SMPTR+16..23 apparently)
  46  *  base+0xc008..c00f      memory at 0x0008..0x000f
  47  *
  48  * This last set (the one at c008) is particularly handy because the SCB
  49  * lives at 0x0008.  So that set of ports gives us easy random access to data
  50  * in the SCB without having to mess around setting up pointers and the like.
  51  * We always use this method to access the SCB (via the scb_xx() functions).
  52  *
  53  * Dataport access works by aiming the appropriate (read or write) pointer
  54  * at the first address you're interested in, and then reading or writing from
  55  * the dataport.  The pointers auto-increment after each transfer.  We use
  56  * this for data transfer.
  57  *
  58  * We don't use the shared-memory system because it allegedly doesn't work on
  59  * all cards, and because it's a bit more prone to go wrong (it's one more
  60  * thing to configure...).
  61  */
  62
  63 /* Known bugs:
  64  *
  65  * - The card seems to want to give us two interrupts every time something
  66  *   happens, where just one would be better.
  67  */
  68
  69 /*
  70  *
  71  * Note by Zoltan Szilagyi 10-12-96:
  72  *
  73  * I've succeeded in eliminating the "CU wedged" messages, and hence the
  74  * lockups, which were only occurring with cards running in 8-bit mode ("force
  75  * 8-bit operation" in Intel's SoftSet utility). This version of the driver
  76  * sets the 82586 and the ASIC to 8-bit mode at startup; it also stops the
  77  * CU before submitting a packet for transmission, and then restarts it as soon
  78  * as the process of handing the packet is complete. This is definitely an
  79  * unnecessary slowdown if the card is running in 16-bit mode; therefore one
  80  * should detect 16-bit vs 8-bit mode from the EEPROM settings and act
  81  * accordingly. In 8-bit mode with this bugfix I'm getting about 150 K/s for
  82  * ftp's, which is significantly better than I get in DOS, so the overhead of
  83  * stopping and restarting the CU with each transmit is not prohibitive in
  84  * practice.
  85  *
  86  * Update by David Woodhouse 11/5/99:
  87  *
  88  * I've seen "CU wedged" messages in 16-bit mode, on the Alpha architecture.
  89  * I assume that this is because 16-bit accesses are actually handled as two
  90  * 8-bit accesses.
  91  */
  92
  93 #ifdef __alpha__
  94 #define LOCKUP16 1
  95 #endif
  96 #ifndef LOCKUP16
  97 #define LOCKUP16 0
  98 #endif
  99
 100 #include <linux/module.h>
 101 #include <linux/kernel.h>
 102 #include <linux/types.h>
 103 #include <linux/fcntl.h>
 104 #include <linux/interrupt.h>
 105 #include <linux/ioport.h>
 106 #include <linux/string.h>
 107 #include <linux/in.h>
 108 #include <linux/delay.h>
 109 #include <linux/errno.h>
 110 #include <linux/init.h>
 111 #include <linux/netdevice.h>
 112 #include <linux/etherdevice.h>
 113 #include <linux/skbuff.h>
 114 #include <linux/spinlock.h>
 115 #include <linux/bitops.h>
 116 #include <linux/jiffies.h>
 117
 118 #include <asm/io.h>
 119 #include <asm/irq.h>
 120
 121 #ifndef NET_DEBUG
 122 #define NET_DEBUG 4
 123 #endif
 124
 125 #include "eexpress.h"
 126
 127 #define EEXP_IO_EXTENT  16
 128
 129 /*
 130  * Private data declarations
 131  */
 132
 133 struct net_local
 134 {
 135         unsigned long last_tx;       /* jiffies when last transmit started */
 136         unsigned long init_time;     /* jiffies when eexp_hw_init586 called */
 137         unsigned short rx_first;     /* first rx buf, same as RX_BUF_START */
 138         unsigned short rx_last;      /* last rx buf */
 139         unsigned short rx_ptr;       /* first rx buf to look at */
 140         unsigned short tx_head;      /* next free tx buf */
 141         unsigned short tx_reap;      /* first in-use tx buf */
 142         unsigned short tx_tail;      /* previous tx buf to tx_head */
 143         unsigned short tx_link;      /* last known-executing tx buf */
 144         unsigned short last_tx_restart;   /* set to tx_link when we
 145                                              restart the CU */
 146         unsigned char started;
 147         unsigned short rx_buf_start;
 148         unsigned short rx_buf_end;
 149         unsigned short num_tx_bufs;
 150         unsigned short num_rx_bufs;
 151         unsigned char width;         /* 0 for 16bit, 1 for 8bit */
 152         unsigned char was_promisc;
 153         unsigned char old_mc_count;
 154         spinlock_t lock;
 155 };
 156
 157 /* This is the code and data that is downloaded to the EtherExpress card's
 158  * memory at boot time.
 159  */
 160
 161 static unsigned short start_code[] = {
 162 /* 0x0000 */
 163         0x0001,                 /* ISCP: busy - cleared after reset */
 164         0x0008,0x0000,0x0000,   /* offset,address (lo,hi) of SCB */
 165
 166         0x0000,0x0000,          /* SCB: status, commands */
 167         0x0000,0x0000,          /* links to first command block,
 168                                    first receive descriptor */
 169         0x0000,0x0000,          /* CRC error, alignment error counts */
 170         0x0000,0x0000,          /* out of resources, overrun error counts */
 171
 172         0x0000,0x0000,          /* pad */
 173         0x0000,0x0000,
 174
 175 /* 0x20 -- start of 82586 CU program */
 176 #define CONF_LINK 0x20
 177         0x0000,Cmd_Config,
 178         0x0032,                 /* link to next command */
 179         0x080c,                 /* 12 bytes follow : fifo threshold=8 */
 180         0x2e40,                 /* don't rx bad frames
 181                                  * SRDY/ARDY => ext. sync. : preamble len=8
 182                                  * take addresses from data buffers
 183                                  * 6 bytes/address
 184                                  */
 185         0x6000,                 /* default backoff method & priority
 186                                  * interframe spacing = 0x60 */
 187         0xf200,                 /* slot time=0x200
 188                                  * max collision retry = 0xf */
 189 #define CONF_PROMISC  0x2e
 190         0x0000,                 /* no HDLC : normal CRC : enable broadcast
 191                                  * disable promiscuous/multicast modes */
 192         0x003c,                 /* minimum frame length = 60 octets) */
 193
 194         0x0000,Cmd_SetAddr,
 195         0x003e,                 /* link to next command */
 196 #define CONF_HWADDR  0x38
 197         0x0000,0x0000,0x0000,   /* hardware address placed here */
 198
 199         0x0000,Cmd_MCast,
 200         0x0076,                 /* link to next command */
 201 #define CONF_NR_MULTICAST 0x44
 202         0x0000,                 /* number of bytes in multicast address(es) */
 203 #define CONF_MULTICAST 0x46
 204         0x0000, 0x0000, 0x0000, /* some addresses */
 205         0x0000, 0x0000, 0x0000,
 206         0x0000, 0x0000, 0x0000,
 207         0x0000, 0x0000, 0x0000,
 208         0x0000, 0x0000, 0x0000,
 209         0x0000, 0x0000, 0x0000,
 210         0x0000, 0x0000, 0x0000,
 211         0x0000, 0x0000, 0x0000,
 212
 213 #define CONF_DIAG_RESULT  0x76
 214         0x0000, Cmd_Diag,
 215         0x007c,                 /* link to next command */
 216
 217         0x0000,Cmd_TDR|Cmd_INT,
 218         0x0084,
 219 #define CONF_TDR_RESULT  0x82
 220         0x0000,
 221
 222         0x0000,Cmd_END|Cmd_Nop, /* end of configure sequence */
 223         0x0084                  /* dummy link */
 224 };
 225
 226 /* maps irq number to EtherExpress magic value */
 227 static char irqrmap[] = { 0,0,1,2,3,4,0,0,0,1,5,6,0,0,0,0 };
 228
 229 /*
 230  * Prototypes for Linux interface
 231  */
 232
 233 static int eexp_open(struct net_device *dev);
 234 static int eexp_close(struct net_device *dev);
 235 static void eexp_timeout(struct net_device *dev);
 236 static netdev_tx_t eexp_xmit(struct sk_buff *buf,
 237                              struct net_device *dev);
 238
 239 static irqreturn_t eexp_irq(int irq, void *dev_addr);
 240 static void eexp_set_multicast(struct net_device *dev);
 241
 242 /*
 243  * Prototypes for hardware access functions
 244  */
 245
 246 static void eexp_hw_rx_pio(struct net_device *dev);
 247 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
 248                        unsigned short len);
 249 static int eexp_hw_probe(struct net_device *dev,unsigned short ioaddr);
 250 static unsigned short eexp_hw_readeeprom(unsigned short ioaddr,
 251                                          unsigned char location);
 252
 253 static unsigned short eexp_hw_lasttxstat(struct net_device *dev);
 254 static void eexp_hw_txrestart(struct net_device *dev);
 255
 256 static void eexp_hw_txinit    (struct net_device *dev);
 257 static void eexp_hw_rxinit    (struct net_device *dev);
 258
 259 static void eexp_hw_init586   (struct net_device *dev);
 260 static void eexp_setup_filter (struct net_device *dev);
 261
 262 static char *eexp_ifmap[]={"AUI", "BNC", "RJ45"};
 263 enum eexp_iftype {AUI=0, BNC=1, TPE=2};
 264
 265 #define STARTED_RU      2
 266 #define STARTED_CU      1
 267
 268 /*
 269  * Primitive hardware access functions.
 270  */
 271
 272 static inline unsigned short scb_status(struct net_device *dev)
 273 {
 274         return inw(dev->base_addr + 0xc008);
 275 }
 276
 277 static inline unsigned short scb_rdcmd(struct net_device *dev)
 278 {
 279         return inw(dev->base_addr + 0xc00a);
 280 }
 281
 282 static inline void scb_command(struct net_device *dev, unsigned short cmd)
 283 {
 284         outw(cmd, dev->base_addr + 0xc00a);
 285 }
 286
 287 static inline void scb_wrcbl(struct net_device *dev, unsigned short val)
 288 {
 289         outw(val, dev->base_addr + 0xc00c);
 290 }
 291
 292 static inline void scb_wrrfa(struct net_device *dev, unsigned short val)
 293 {
 294         outw(val, dev->base_addr + 0xc00e);
 295 }
 296
 297 static inline void set_loopback(struct net_device *dev)
 298 {
 299         outb(inb(dev->base_addr + Config) | 2, dev->base_addr + Config);
 300 }
 301
 302 static inline void clear_loopback(struct net_device *dev)
 303 {
 304         outb(inb(dev->base_addr + Config) & ~2, dev->base_addr + Config);
 305 }
 306
 307 static inline unsigned short int SHADOW(short int addr)
 308 {
 309         addr &= 0x1f;
 310         if (addr > 0xf) addr += 0x3ff0;
 311         return addr + 0x4000;
 312 }
 313
 314 /*
 315  * Linux interface
 316  */
 317
 318 /*
 319  * checks for presence of EtherExpress card
 320  */
 321
 322 static int __init do_express_probe(struct net_device *dev)
 323 {
 324         unsigned short *port;
 325         static unsigned short ports[] = { 0x240,0x300,0x310,0x270,0x320,0x340,0 };
 326         unsigned short ioaddr = dev->base_addr;
 327         int dev_irq = dev->irq;
 328         int err;
 329
 330         dev->if_port = 0xff; /* not set */
 331
 332         if (ioaddr&0xfe00) {
 333                 if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress"))
 334                         return -EBUSY;
 335                 err = eexp_hw_probe(dev,ioaddr);
 336                 release_region(ioaddr, EEXP_IO_EXTENT);
 337                 return err;
 338         } else if (ioaddr)
 339                 return -ENXIO;
 340
 341         for (port=&ports[0] ; *port ; port++ )
 342         {
 343                 unsigned short sum = 0;
 344                 int i;
 345                 if (!request_region(*port, EEXP_IO_EXTENT, "EtherExpress"))
 346                         continue;
 347                 for ( i=0 ; i<4 ; i++ )
 348                 {
 349                         unsigned short t;
 350                         t = inb(*port + ID_PORT);
 351                         sum |= (t>>4) << ((t & 0x03)<<2);
 352                 }
 353                 if (sum==0xbaba && !eexp_hw_probe(dev,*port)) {
 354                         release_region(*port, EEXP_IO_EXTENT);
 355                         return 0;
 356                 }
 357                 release_region(*port, EEXP_IO_EXTENT);
 358                 dev->irq = dev_irq;
 359         }
 360         return -ENODEV;
 361 }
 362
 363 #ifndef MODULE
 364 struct net_device * __init express_probe(int unit)
 365 {
 366         struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
 367         int err;
 368
 369         if (!dev)
 370                 return ERR_PTR(-ENOMEM);
 371
 372         sprintf(dev->name, "eth%d", unit);
 373         netdev_boot_setup_check(dev);
 374
 375         err = do_express_probe(dev);
 376         if (!err)
 377                 return dev;
 378         free_netdev(dev);
 379         return ERR_PTR(err);
 380 }
 381 #endif
 382
 383 /*
 384  * open and initialize the adapter, ready for use
 385  */
 386
 387 static int eexp_open(struct net_device *dev)
 388 {
 389         int ret;
 390         unsigned short ioaddr = dev->base_addr;
 391         struct net_local *lp = netdev_priv(dev);
 392
 393 #if NET_DEBUG > 6
 394         printk(KERN_DEBUG "%s: eexp_open()\n", dev->name);
 395 #endif
 396
 397         if (!dev->irq || !irqrmap[dev->irq])
 398                 return -ENXIO;
 399
 400         ret = request_irq(dev->irq, eexp_irq, 0, dev->name, dev);
 401         if (ret)
 402                 return ret;
 403
 404         if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress")) {
 405                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 406                         , ioaddr);
 407                 goto err_out1;
 408         }
 409         if (!request_region(ioaddr+0x4000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 410                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 411                         , ioaddr+0x4000);
 412                 goto err_out2;
 413         }
 414         if (!request_region(ioaddr+0x8000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 415                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 416                         , ioaddr+0x8000);
 417                 goto err_out3;
 418         }
 419         if (!request_region(ioaddr+0xc000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 420                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 421                         , ioaddr+0xc000);
 422                 goto err_out4;
 423         }
 424
 425         if (lp->width) {
 426                 printk("%s: forcing ASIC to 8-bit mode\n", dev->name);
 427                 outb(inb(dev->base_addr+Config)&~4, dev->base_addr+Config);
 428         }
 429
 430         eexp_hw_init586(dev);
 431         netif_start_queue(dev);
 432 #if NET_DEBUG > 6
 433         printk(KERN_DEBUG "%s: leaving eexp_open()\n", dev->name);
 434 #endif
 435         return 0;
 436
 437         err_out4:
 438                 release_region(ioaddr+0x8000, EEXP_IO_EXTENT);
 439         err_out3:
 440                 release_region(ioaddr+0x4000, EEXP_IO_EXTENT);
 441         err_out2:
 442                 release_region(ioaddr, EEXP_IO_EXTENT);
 443         err_out1:
 444                 free_irq(dev->irq, dev);
 445                 return -EBUSY;
 446 }
 447
 448 /*
 449  * close and disable the interface, leaving the 586 in reset.
 450  */
 451
 452 static int eexp_close(struct net_device *dev)
 453 {
 454         unsigned short ioaddr = dev->base_addr;
 455         struct net_local *lp = netdev_priv(dev);
 456
 457         int irq = dev->irq;
 458
 459         netif_stop_queue(dev);
 460
 461         outb(SIRQ_dis|irqrmap[irq],ioaddr+SET_IRQ);
 462         lp->started = 0;
 463         scb_command(dev, SCB_CUsuspend|SCB_RUsuspend);
 464         outb(0,ioaddr+SIGNAL_CA);
 465         free_irq(irq,dev);
 466         outb(i586_RST,ioaddr+EEPROM_Ctrl);
 467         release_region(ioaddr, EEXP_IO_EXTENT);
 468         release_region(ioaddr+0x4000, 16);
 469         release_region(ioaddr+0x8000, 16);
 470         release_region(ioaddr+0xc000, 16);
 471
 472         return 0;
 473 }
 474
 475 /*
 476  * This gets called when a higher level thinks we are broken.  Check that
 477  * nothing has become jammed in the CU.
 478  */
 479
 480 static void unstick_cu(struct net_device *dev)
 481 {
 482         struct net_local *lp = netdev_priv(dev);
 483         unsigned short ioaddr = dev->base_addr;
 484
 485         if (lp->started)
 486         {
 487                 if (time_after(jiffies, dev_trans_start(dev) + HZ/2))
 488                 {
 489                         if (lp->tx_link==lp->last_tx_restart)
 490                         {
 491                                 unsigned short boguscount=200,rsst;
 492                                 printk(KERN_WARNING "%s: Retransmit timed out, status %04x, resetting...\n",
 493                                        dev->name, scb_status(dev));
 494                                 eexp_hw_txinit(dev);
 495                                 lp->last_tx_restart = 0;
 496                                 scb_wrcbl(dev, lp->tx_link);
 497                                 scb_command(dev, SCB_CUstart);
 498                                 outb(0,ioaddr+SIGNAL_CA);
 499                                 while (!SCB_complete(rsst=scb_status(dev)))
 500                                 {
 501                                         if (!--boguscount)
 502                                         {
 503                                                 boguscount=200;
 504                                                 printk(KERN_WARNING "%s: Reset timed out status %04x, retrying...\n",
 505                                                        dev->name,rsst);
 506                                                 scb_wrcbl(dev, lp->tx_link);
 507                                                 scb_command(dev, SCB_CUstart);
 508                                                 outb(0,ioaddr+SIGNAL_CA);
 509                                         }
 510                                 }
 511                                 netif_wake_queue(dev);
 512                         }
 513                         else
 514                         {
 515                                 unsigned short status = scb_status(dev);
 516                                 if (SCB_CUdead(status))
 517                                 {
 518                                         unsigned short txstatus = eexp_hw_lasttxstat(dev);
 519                                         printk(KERN_WARNING "%s: Transmit timed out, CU not active status %04x %04x, restarting...\n",
 520                                                dev->name, status, txstatus);
 521                                         eexp_hw_txrestart(dev);
 522                                 }
 523                                 else
 524                                 {
 525                                         unsigned short txstatus = eexp_hw_lasttxstat(dev);
 526                                         if (netif_queue_stopped(dev) && !txstatus)
 527                                         {
 528                                                 printk(KERN_WARNING "%s: CU wedged, status %04x %04x, resetting...\n",
 529                                                        dev->name,status,txstatus);
 530                                                 eexp_hw_init586(dev);
 531                                                 netif_wake_queue(dev);
 532                                         }
 533                                         else
 534                                         {
 535                                                 printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
 536                                         }
 537                                 }
 538                         }
 539                 }
 540         }
 541         else
 542         {
 543                 if (time_after(jiffies, lp->init_time + 10))
 544                 {
 545                         unsigned short status = scb_status(dev);
 546                         printk(KERN_WARNING "%s: i82586 startup timed out, status %04x, resetting...\n",
 547                                dev->name, status);
 548                         eexp_hw_init586(dev);
 549                         netif_wake_queue(dev);
 550                 }
 551         }
 552 }
 553
 554 static void eexp_timeout(struct net_device *dev)
 555 {
 556         struct net_local *lp = netdev_priv(dev);
 557 #ifdef CONFIG_SMP
 558         unsigned long flags;
 559 #endif
 560         int status;
 561
 562         disable_irq(dev->irq);
 563
 564         /*
 565          *      Best would be to use synchronize_irq(); spin_lock() here
 566          *      lets make it work first..
 567          */
 568
 569 #ifdef CONFIG_SMP
 570         spin_lock_irqsave(&lp->lock, flags);
 571 #endif
 572
 573         status = scb_status(dev);
 574         unstick_cu(dev);
 575         printk(KERN_INFO "%s: transmit timed out, %s?\n", dev->name,
 576                (SCB_complete(status)?"lost interrupt":
 577                 "board on fire"));
 578         dev->stats.tx_errors++;
 579         lp->last_tx = jiffies;
 580         if (!SCB_complete(status)) {
 581                 scb_command(dev, SCB_CUabort);
 582                 outb(0,dev->base_addr+SIGNAL_CA);
 583         }
 584         netif_wake_queue(dev);
 585 #ifdef CONFIG_SMP
 586         spin_unlock_irqrestore(&lp->lock, flags);
 587 #endif
 588 }
 589
 590 /*
 591  * Called to transmit a packet, or to allow us to right ourselves
 592  * if the kernel thinks we've died.
 593  */
 594 static netdev_tx_t eexp_xmit(struct sk_buff *buf, struct net_device *dev)
 595 {
 596         short length = buf->len;
 597 #ifdef CONFIG_SMP
 598         struct net_local *lp = netdev_priv(dev);
 599         unsigned long flags;
 600 #endif
 601
 602 #if NET_DEBUG > 6
 603         printk(KERN_DEBUG "%s: eexp_xmit()\n", dev->name);
 604 #endif
 605
 606         if (buf->len < ETH_ZLEN) {
 607                 if (skb_padto(buf, ETH_ZLEN))
 608                         return NETDEV_TX_OK;
 609                 length = ETH_ZLEN;
 610         }
 611
 612         disable_irq(dev->irq);
 613
 614         /*
 615          *      Best would be to use synchronize_irq(); spin_lock() here
 616          *      lets make it work first..
 617          */
 618
 619 #ifdef CONFIG_SMP
 620         spin_lock_irqsave(&lp->lock, flags);
 621 #endif
 622
 623         {
 624                 unsigned short *data = (unsigned short *)buf->data;
 625
 626                 dev->stats.tx_bytes += length;
 627
 628                 eexp_hw_tx_pio(dev,data,length);
 629         }
 630         dev_kfree_skb(buf);
 631 #ifdef CONFIG_SMP
 632         spin_unlock_irqrestore(&lp->lock, flags);
 633 #endif
 634         enable_irq(dev->irq);
 635         return NETDEV_TX_OK;
 636 }
 637
 638 /*
 639  * Handle an EtherExpress interrupt
 640  * If we've finished initializing, start the RU and CU up.
 641  * If we've already started, reap tx buffers, handle any received packets,
 642  * check to make sure we've not become wedged.
 643  */
 644
 645 static unsigned short eexp_start_irq(struct net_device *dev,
 646                                      unsigned short status)
 647 {
 648         unsigned short ack_cmd = SCB_ack(status);
 649         struct net_local *lp = netdev_priv(dev);
 650         unsigned short ioaddr = dev->base_addr;
 651         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_CU)) {
 652                 short diag_status, tdr_status;
 653                 while (SCB_CUstat(status)==2)
 654                         status = scb_status(dev);
 655 #if NET_DEBUG > 4
 656                 printk("%s: CU went non-active (status %04x)\n",
 657                        dev->name, status);
 658 #endif
 659
 660                 outw(CONF_DIAG_RESULT & ~31, ioaddr + SM_PTR);
 661                 diag_status = inw(ioaddr + SHADOW(CONF_DIAG_RESULT));
 662                 if (diag_status & 1<<11) {
 663                         printk(KERN_WARNING "%s: 82586 failed self-test\n",
 664                                dev->name);
 665                 } else if (!(diag_status & 1<<13)) {
 666                         printk(KERN_WARNING "%s: 82586 self-test failed to complete\n", dev->name);
 667                 }
 668
 669                 outw(CONF_TDR_RESULT & ~31, ioaddr + SM_PTR);
 670                 tdr_status = inw(ioaddr + SHADOW(CONF_TDR_RESULT));
 671                 if (tdr_status & (TDR_SHORT|TDR_OPEN)) {
 672                         printk(KERN_WARNING "%s: TDR reports cable %s at %d tick%s\n", dev->name, (tdr_status & TDR_SHORT)?"short":"broken", tdr_status & TDR_TIME, ((tdr_status & TDR_TIME) != 1) ? "s" : "");
 673                 }
 674                 else if (tdr_status & TDR_XCVRPROBLEM) {
 675                         printk(KERN_WARNING "%s: TDR reports transceiver problem\n", dev->name);
 676                 }
 677                 else if (tdr_status & TDR_LINKOK) {
 678 #if NET_DEBUG > 4
 679                         printk(KERN_DEBUG "%s: TDR reports link OK\n", dev->name);
 680 #endif
 681                 } else {
 682                         printk("%s: TDR is ga-ga (status %04x)\n", dev->name,
 683                                tdr_status);
 684                 }
 685
 686                 lp->started |= STARTED_CU;
 687                 scb_wrcbl(dev, lp->tx_link);
 688                 /* if the RU isn't running, start it now */
 689                 if (!(lp->started & STARTED_RU)) {
 690                         ack_cmd |= SCB_RUstart;
 691                         scb_wrrfa(dev, lp->rx_buf_start);
 692                         lp->rx_ptr = lp->rx_buf_start;
 693                         lp->started |= STARTED_RU;
 694                 }
 695                 ack_cmd |= SCB_CUstart | 0x2000;
 696         }
 697
 698         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_RU) && SCB_RUstat(status)==4)
 699                 lp->started|=STARTED_RU;
 700
 701         return ack_cmd;
 702 }
 703
 704 static void eexp_cmd_clear(struct net_device *dev)
 705 {
 706         unsigned long int oldtime = jiffies;
 707         while (scb_rdcmd(dev) && (time_before(jiffies, oldtime + 10)));
 708         if (scb_rdcmd(dev)) {
 709                 printk("%s: command didn't clear\n", dev->name);
 710         }
 711 }
 712
 713 static irqreturn_t eexp_irq(int dummy, void *dev_info)
 714 {
 715         struct net_device *dev = dev_info;
 716         struct net_local *lp;
 717         unsigned short ioaddr,status,ack_cmd;
 718         unsigned short old_read_ptr, old_write_ptr;
 719
 720         lp = netdev_priv(dev);
 721         ioaddr = dev->base_addr;
 722
 723         spin_lock(&lp->lock);
 724
 725         old_read_ptr = inw(ioaddr+READ_PTR);
 726         old_write_ptr = inw(ioaddr+WRITE_PTR);
 727
 728         outb(SIRQ_dis|irqrmap[dev->irq], ioaddr+SET_IRQ);
 729
 730         status = scb_status(dev);
 731
 732 #if NET_DEBUG > 4
 733         printk(KERN_DEBUG "%s: interrupt (status %x)\n", dev->name, status);
 734 #endif
 735
 736         if (lp->started == (STARTED_CU | STARTED_RU)) {
 737
 738                 do {
 739                         eexp_cmd_clear(dev);
 740
 741                         ack_cmd = SCB_ack(status);
 742                         scb_command(dev, ack_cmd);
 743                         outb(0,ioaddr+SIGNAL_CA);
 744
 745                         eexp_cmd_clear(dev);
 746
 747                         if (SCB_complete(status)) {
 748                                 if (!eexp_hw_lasttxstat(dev)) {
 749                                         printk("%s: tx interrupt but no status\n", dev->name);
 750                                 }
 751                         }
 752
 753                         if (SCB_rxdframe(status))
 754                                 eexp_hw_rx_pio(dev);
 755
 756                         status = scb_status(dev);
 757                 } while (status & 0xc000);
 758
 759                 if (SCB_RUdead(status))
 760                 {
 761                         printk(KERN_WARNING "%s: RU stopped: status %04x\n",
 762                                dev->name,status);
 763 #if 0
 764                         printk(KERN_WARNING "%s: cur_rfd=%04x, cur_rbd=%04x\n", dev->name, lp->cur_rfd, lp->cur_rbd);
 765                         outw(lp->cur_rfd, ioaddr+READ_PTR);
 766                         printk(KERN_WARNING "%s: [%04x]\n", dev->name, inw(ioaddr+DATAPORT));
 767                         outw(lp->cur_rfd+6, ioaddr+READ_PTR);
 768                         printk(KERN_WARNING "%s: rbd is %04x\n", dev->name, rbd= inw(ioaddr+DATAPORT));
 769                         outw(rbd, ioaddr+READ_PTR);
 770                         printk(KERN_WARNING "%s: [%04x %04x] ", dev->name, inw(ioaddr+DATAPORT), inw(ioaddr+DATAPORT));
 771                         outw(rbd+8, ioaddr+READ_PTR);
 772                         printk("[%04x]\n", inw(ioaddr+DATAPORT));
 773 #endif
 774                         dev->stats.rx_errors++;
 775 #if 1
 776                         eexp_hw_rxinit(dev);
 777 #else
 778                         lp->cur_rfd = lp->first_rfd;
 779 #endif
 780                         scb_wrrfa(dev, lp->rx_buf_start);
 781                         scb_command(dev, SCB_RUstart);
 782                         outb(0,ioaddr+SIGNAL_CA);
 783                 }
 784         } else {
 785                 if (status & 0x8000)
 786                         ack_cmd = eexp_start_irq(dev, status);
 787                 else
 788                         ack_cmd = SCB_ack(status);
 789                 scb_command(dev, ack_cmd);
 790                 outb(0,ioaddr+SIGNAL_CA);
 791         }
 792
 793         eexp_cmd_clear(dev);
 794
 795         outb(SIRQ_en|irqrmap[dev->irq], ioaddr+SET_IRQ);
 796
 797 #if NET_DEBUG > 6
 798         printk("%s: leaving eexp_irq()\n", dev->name);
 799 #endif
 800         outw(old_read_ptr, ioaddr+READ_PTR);
 801         outw(old_write_ptr, ioaddr+WRITE_PTR);
 802
 803         spin_unlock(&lp->lock);
 804         return IRQ_HANDLED;
 805 }
 806
 807 /*
 808  * Hardware access functions
 809  */
 810
 811 /*
 812  * Set the cable type to use.
 813  */
 814
 815 static void eexp_hw_set_interface(struct net_device *dev)
 816 {
 817         unsigned char oldval = inb(dev->base_addr + 0x300e);
 818         oldval &= ~0x82;
 819         switch (dev->if_port) {
 820         case TPE:
 821                 oldval |= 0x2;
 822         case BNC:
 823                 oldval |= 0x80;
 824                 break;
 825         }
 826         outb(oldval, dev->base_addr+0x300e);
 827         mdelay(20);
 828 }
 829
 830 /*
 831  * Check all the receive buffers, and hand any received packets
 832  * to the upper levels. Basic sanity check on each frame
 833  * descriptor, though we don't bother trying to fix broken ones.
 834  */
 835
 836 static void eexp_hw_rx_pio(struct net_device *dev)
 837 {
 838         struct net_local *lp = netdev_priv(dev);
 839         unsigned short rx_block = lp->rx_ptr;
 840         unsigned short boguscount = lp->num_rx_bufs;
 841         unsigned short ioaddr = dev->base_addr;
 842         unsigned short status;
 843
 844 #if NET_DEBUG > 6
 845         printk(KERN_DEBUG "%s: eexp_hw_rx()\n", dev->name);
 846 #endif
 847
 848         do {
 849                 unsigned short rfd_cmd, rx_next, pbuf, pkt_len;
 850
 851                 outw(rx_block, ioaddr + READ_PTR);
 852                 status = inw(ioaddr + DATAPORT);
 853
 854                 if (FD_Done(status))
 855                 {
 856                         rfd_cmd = inw(ioaddr + DATAPORT);
 857                         rx_next = inw(ioaddr + DATAPORT);
 858                         pbuf = inw(ioaddr + DATAPORT);
 859
 860                         outw(pbuf, ioaddr + READ_PTR);
 861                         pkt_len = inw(ioaddr + DATAPORT);
 862
 863                         if (rfd_cmd!=0x0000)
 864                         {
 865                                 printk(KERN_WARNING "%s: rfd_cmd not zero:0x%04x\n",
 866                                        dev->name, rfd_cmd);
 867                                 continue;
 868                         }
 869                         else if (pbuf!=rx_block+0x16)
 870                         {
 871                                 printk(KERN_WARNING "%s: rfd and rbd out of sync 0x%04x 0x%04x\n",
 872                                        dev->name, rx_block+0x16, pbuf);
 873                                 continue;
 874                         }
 875                         else if ((pkt_len & 0xc000)!=0xc000)
 876                         {
 877                                 printk(KERN_WARNING "%s: EOF or F not set on received buffer (%04x)\n",
 878                                        dev->name, pkt_len & 0xc000);
 879                                 continue;
 880                         }
 881                         else if (!FD_OK(status))
 882                         {
 883                                 dev->stats.rx_errors++;
 884                                 if (FD_CRC(status))
 885                                         dev->stats.rx_crc_errors++;
 886                                 if (FD_Align(status))
 887                                         dev->stats.rx_frame_errors++;
 888                                 if (FD_Resrc(status))
 889                                         dev->stats.rx_fifo_errors++;
 890                                 if (FD_DMA(status))
 891                                         dev->stats.rx_over_errors++;
 892                                 if (FD_Short(status))
 893                                         dev->stats.rx_length_errors++;
 894                         }
 895                         else
 896                         {
 897                                 struct sk_buff *skb;
 898                                 pkt_len &= 0x3fff;
 899                                 skb = netdev_alloc_skb(dev, pkt_len + 16);
 900                                 if (skb == NULL)
 901                                 {
 902                                         printk(KERN_WARNING "%s: Memory squeeze, dropping packet\n",dev->name);
 903                                         dev->stats.rx_dropped++;
 904                                         break;
 905                                 }
 906                                 skb_reserve(skb, 2);
 907                                 outw(pbuf+10, ioaddr+READ_PTR);
 908                                 insw(ioaddr+DATAPORT, skb_put(skb,pkt_len),(pkt_len+1)>>1);
 909                                 skb->protocol = eth_type_trans(skb,dev);
 910                                 netif_rx(skb);
 911                                 dev->stats.rx_packets++;
 912                                 dev->stats.rx_bytes += pkt_len;
 913                         }
 914                         outw(rx_block, ioaddr+WRITE_PTR);
 915                         outw(0, ioaddr+DATAPORT);
 916                         outw(0, ioaddr+DATAPORT);
 917                         rx_block = rx_next;
 918                 }
 919         } while (FD_Done(status) && boguscount--);
 920         lp->rx_ptr = rx_block;
 921 }
 922
 923 /*
 924  * Hand a packet to the card for transmission
 925  * If we get here, we MUST have already checked
 926  * to make sure there is room in the transmit
 927  * buffer region.
 928  */
 929
 930 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
 931                        unsigned short len)
 932 {
 933         struct net_local *lp = netdev_priv(dev);
 934         unsigned short ioaddr = dev->base_addr;
 935
 936         if (LOCKUP16 || lp->width) {
 937                 /* Stop the CU so that there is no chance that it
 938                    jumps off to a bogus address while we are writing the
 939                    pointer to the next transmit packet in 8-bit mode --
 940                    this eliminates the "CU wedged" errors in 8-bit mode.
 941                    (Zoltan Szilagyi 10-12-96) */
 942                 scb_command(dev, SCB_CUsuspend);
 943                 outw(0xFFFF, ioaddr+SIGNAL_CA);
 944         }
 945
 946         outw(lp->tx_head, ioaddr + WRITE_PTR);
 947
 948         outw(0x0000, ioaddr + DATAPORT);
 949         outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
 950         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
 951         outw(lp->tx_head+0x0e, ioaddr + DATAPORT);
 952
 953         outw(0x0000, ioaddr + DATAPORT);
 954         outw(0x0000, ioaddr + DATAPORT);
 955         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
 956
 957         outw(0x8000|len, ioaddr + DATAPORT);
 958         outw(-1, ioaddr + DATAPORT);
 959         outw(lp->tx_head+0x16, ioaddr + DATAPORT);
 960         outw(0, ioaddr + DATAPORT);
 961
 962         outsw(ioaddr + DATAPORT, buf, (len+1)>>1);
 963
 964         outw(lp->tx_tail+0xc, ioaddr + WRITE_PTR);
 965         outw(lp->tx_head, ioaddr + DATAPORT);
 966
 967         dev->trans_start = jiffies;
 968         lp->tx_tail = lp->tx_head;
 969         if (lp->tx_head==TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
 970                 lp->tx_head = TX_BUF_START;
 971         else
 972                 lp->tx_head += TX_BUF_SIZE;
 973         if (lp->tx_head != lp->tx_reap)
 974                 netif_wake_queue(dev);
 975
 976         if (LOCKUP16 || lp->width) {
 977                 /* Restart the CU so that the packet can actually
 978                    be transmitted. (Zoltan Szilagyi 10-12-96) */
 979                 scb_command(dev, SCB_CUresume);
 980                 outw(0xFFFF, ioaddr+SIGNAL_CA);
 981         }
 982
 983         dev->stats.tx_packets++;
 984         lp->last_tx = jiffies;
 985 }
 986
 987 static const struct net_device_ops eexp_netdev_ops = {
 988         .ndo_open               = eexp_open,
 989         .ndo_stop               = eexp_close,
 990         .ndo_start_xmit         = eexp_xmit,
 991         .ndo_set_rx_mode        = eexp_set_multicast,
 992         .ndo_tx_timeout         = eexp_timeout,
 993         .ndo_change_mtu         = eth_change_mtu,
 994         .ndo_set_mac_address    = eth_mac_addr,
 995         .ndo_validate_addr      = eth_validate_addr,
 996 };
 997
 998 /*
 999  * Sanity check the suspected EtherExpress card
1000  * Read hardware address, reset card, size memory and initialize buffer
1001  * memory pointers. These are held in netdev_priv(), in case someone has more
1002  * than one card in a machine.
1003  */
1004
1005 static int __init eexp_hw_probe(struct net_device *dev, unsigned short ioaddr)
1006 {
1007         unsigned short hw_addr[3];
1008         unsigned char buswidth;
1009         unsigned int memory_size;
1010         int i;
1011         unsigned short xsum = 0;
1012         struct net_local *lp = netdev_priv(dev);
1013
1014         printk("%s: EtherExpress 16 at %#x ",dev->name,ioaddr);
1015
1016         outb(ASIC_RST, ioaddr+EEPROM_Ctrl);
1017         outb(0, ioaddr+EEPROM_Ctrl);
1018         udelay(500);
1019         outb(i586_RST, ioaddr+EEPROM_Ctrl);
1020
1021         hw_addr[0] = eexp_hw_readeeprom(ioaddr,2);
1022         hw_addr[1] = eexp_hw_readeeprom(ioaddr,3);
1023         hw_addr[2] = eexp_hw_readeeprom(ioaddr,4);
1024
1025         /* Standard Address or Compaq LTE Address */
1026         if (!((hw_addr[2]==0x00aa && ((hw_addr[1] & 0xff00)==0x0000)) ||
1027               (hw_addr[2]==0x0080 && ((hw_addr[1] & 0xff00)==0x5F00))))
1028         {
1029                 printk(" rejected: invalid address %04x%04x%04x\n",
1030                         hw_addr[2],hw_addr[1],hw_addr[0]);
1031                 return -ENODEV;
1032         }
1033
1034         /* Calculate the EEPROM checksum.  Carry on anyway if it's bad,
1035          * though.
1036          */
1037         for (i = 0; i < 64; i++)
1038                 xsum += eexp_hw_readeeprom(ioaddr, i);
1039         if (xsum != 0xbaba)
1040                 printk(" (bad EEPROM xsum 0x%02x)", xsum);
1041
1042         dev->base_addr = ioaddr;
1043         for ( i=0 ; i<6 ; i++ )
1044                 dev->dev_addr[i] = ((unsigned char *)hw_addr)[5-i];
1045
1046         {
1047                 static const char irqmap[] = { 0, 9, 3, 4, 5, 10, 11, 0 };
1048                 unsigned short setupval = eexp_hw_readeeprom(ioaddr,0);
1049
1050                 /* Use the IRQ from EEPROM if none was given */
1051                 if (!dev->irq)
1052                         dev->irq = irqmap[setupval>>13];
1053
1054                 if (dev->if_port == 0xff) {
1055                         dev->if_port = !(setupval & 0x1000) ? AUI :
1056                                 eexp_hw_readeeprom(ioaddr,5) & 0x1 ? TPE : BNC;
1057                 }
1058
1059                 buswidth = !((setupval & 0x400) >> 10);
1060         }
1061
1062         memset(lp, 0, sizeof(struct net_local));
1063         spin_lock_init(&lp->lock);
1064
1065         printk("(IRQ %d, %s connector, %d-bit bus", dev->irq,
1066                eexp_ifmap[dev->if_port], buswidth?8:16);
1067
1068         if (!request_region(dev->base_addr + 0x300e, 1, "EtherExpress"))
1069                 return -EBUSY;
1070
1071         eexp_hw_set_interface(dev);
1072
1073         release_region(dev->base_addr + 0x300e, 1);
1074
1075         /* Find out how much RAM we have on the card */
1076         outw(0, dev->base_addr + WRITE_PTR);
1077         for (i = 0; i < 32768; i++)
1078                 outw(0, dev->base_addr + DATAPORT);
1079
1080         for (memory_size = 0; memory_size < 64; memory_size++)
1081         {
1082                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1083                 if (inw(dev->base_addr+DATAPORT))
1084                         break;
1085                 outw(memory_size<<10, dev->base_addr + WRITE_PTR);
1086                 outw(memory_size | 0x5000, dev->base_addr+DATAPORT);
1087                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1088                 if (inw(dev->base_addr+DATAPORT) != (memory_size | 0x5000))
1089                         break;
1090         }
1091
1092         /* Sort out the number of buffers.  We may have 16, 32, 48 or 64k
1093          * of RAM to play with.
1094          */
1095         lp->num_tx_bufs = 4;
1096         lp->rx_buf_end = 0x3ff6;
1097         switch (memory_size)
1098         {
1099         case 64:
1100                 lp->rx_buf_end += 0x4000;
1101         case 48:
1102                 lp->num_tx_bufs += 4;
1103                 lp->rx_buf_end += 0x4000;
1104         case 32:
1105                 lp->rx_buf_end += 0x4000;
1106         case 16:
1107                 printk(", %dk RAM)\n", memory_size);
1108                 break;
1109         default:
1110                 printk(") bad memory size (%dk).\n", memory_size);
1111                 return -ENODEV;
1112                 break;
1113         }
1114
1115         lp->rx_buf_start = TX_BUF_START + (lp->num_tx_bufs*TX_BUF_SIZE);
1116         lp->width = buswidth;
1117
1118         dev->netdev_ops = &eexp_netdev_ops;
1119         dev->watchdog_timeo = 2*HZ;
1120
1121         return register_netdev(dev);
1122 }
1123
1124 /*
1125  * Read a word from the EtherExpress on-board serial EEPROM.
1126  * The EEPROM contains 64 words of 16 bits.
1127  */
1128 static unsigned short __init eexp_hw_readeeprom(unsigned short ioaddr,
1129                                                     unsigned char location)
1130 {
1131         unsigned short cmd = 0x180|(location&0x7f);
1132         unsigned short rval = 0,wval = EC_CS|i586_RST;
1133         int i;
1134
1135         outb(EC_CS|i586_RST,ioaddr+EEPROM_Ctrl);
1136         for (i=0x100 ; i ; i>>=1 )
1137         {
1138                 if (cmd&i)
1139                         wval |= EC_Wr;
1140                 else
1141                         wval &= ~EC_Wr;
1142
1143                 outb(wval,ioaddr+EEPROM_Ctrl);
1144                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1145                 eeprom_delay();
1146                 outb(wval,ioaddr+EEPROM_Ctrl);
1147                 eeprom_delay();
1148         }
1149         wval &= ~EC_Wr;
1150         outb(wval,ioaddr+EEPROM_Ctrl);
1151         for (i=0x8000 ; i ; i>>=1 )
1152         {
1153                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1154                 eeprom_delay();
1155                 if (inb(ioaddr+EEPROM_Ctrl)&EC_Rd)
1156                         rval |= i;
1157                 outb(wval,ioaddr+EEPROM_Ctrl);
1158                 eeprom_delay();
1159         }
1160         wval &= ~EC_CS;
1161         outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1162         eeprom_delay();
1163         outb(wval,ioaddr+EEPROM_Ctrl);
1164         eeprom_delay();
1165         return rval;
1166 }
1167
1168 /*
1169  * Reap tx buffers and return last transmit status.
1170  * if ==0 then either:
1171  *    a) we're not transmitting anything, so why are we here?
1172  *    b) we've died.
1173  * otherwise, Stat_Busy(return) means we've still got some packets
1174  * to transmit, Stat_Done(return) means our buffers should be empty
1175  * again
1176  */
1177
1178 static unsigned short eexp_hw_lasttxstat(struct net_device *dev)
1179 {
1180         struct net_local *lp = netdev_priv(dev);
1181         unsigned short tx_block = lp->tx_reap;
1182         unsigned short status;
1183
1184         if (!netif_queue_stopped(dev) && lp->tx_head==lp->tx_reap)
1185                 return 0x0000;
1186
1187         do
1188         {
1189                 outw(tx_block & ~31, dev->base_addr + SM_PTR);
1190                 status = inw(dev->base_addr + SHADOW(tx_block));
1191                 if (!Stat_Done(status))
1192                 {
1193                         lp->tx_link = tx_block;
1194                         return status;
1195                 }
1196                 else
1197                 {
1198                         lp->last_tx_restart = 0;
1199                         dev->stats.collisions += Stat_NoColl(status);
1200                         if (!Stat_OK(status))
1201                         {
1202                                 char *whatsup = NULL;
1203                                 dev->stats.tx_errors++;
1204                                 if (Stat_Abort(status))
1205                                         dev->stats.tx_aborted_errors++;
1206                                 if (Stat_TNoCar(status)) {
1207                                         whatsup = "aborted, no carrier";
1208                                         dev->stats.tx_carrier_errors++;
1209                                 }
1210                                 if (Stat_TNoCTS(status)) {
1211                                         whatsup = "aborted, lost CTS";
1212                                         dev->stats.tx_carrier_errors++;
1213                                 }
1214                                 if (Stat_TNoDMA(status)) {
1215                                         whatsup = "FIFO underran";
1216                                         dev->stats.tx_fifo_errors++;
1217                                 }
1218                                 if (Stat_TXColl(status)) {
1219                                         whatsup = "aborted, too many collisions";
1220                                         dev->stats.tx_aborted_errors++;
1221                                 }
1222                                 if (whatsup)
1223                                         printk(KERN_INFO "%s: transmit %s\n",
1224                                                dev->name, whatsup);
1225                         }
1226                         else
1227                                 dev->stats.tx_packets++;
1228                 }
1229                 if (tx_block == TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1230                         lp->tx_reap = tx_block = TX_BUF_START;
1231                 else
1232                         lp->tx_reap = tx_block += TX_BUF_SIZE;
1233                 netif_wake_queue(dev);
1234         }
1235         while (lp->tx_reap != lp->tx_head);
1236
1237         lp->tx_link = lp->tx_tail + 0x08;
1238
1239         return status;
1240 }
1241
1242 /*
1243  * This should never happen. It is called when some higher routine detects
1244  * that the CU has stopped, to try to restart it from the last packet we knew
1245  * we were working on, or the idle loop if we had finished for the time.
1246  */
1247
1248 static void eexp_hw_txrestart(struct net_device *dev)
1249 {
1250         struct net_local *lp = netdev_priv(dev);
1251         unsigned short ioaddr = dev->base_addr;
1252
1253         lp->last_tx_restart = lp->tx_link;
1254         scb_wrcbl(dev, lp->tx_link);
1255         scb_command(dev, SCB_CUstart);
1256         outb(0,ioaddr+SIGNAL_CA);
1257
1258         {
1259                 unsigned short boguscount=50,failcount=5;
1260                 while (!scb_status(dev))
1261                 {
1262                         if (!--boguscount)
1263                         {
1264                                 if (--failcount)
1265                                 {
1266                                         printk(KERN_WARNING "%s: CU start timed out, status %04x, cmd %04x\n", dev->name, scb_status(dev), scb_rdcmd(dev));
1267                                         scb_wrcbl(dev, lp->tx_link);
1268                                         scb_command(dev, SCB_CUstart);
1269                                         outb(0,ioaddr+SIGNAL_CA);
1270                                         boguscount = 100;
1271                                 }
1272                                 else
1273                                 {
1274                                         printk(KERN_WARNING "%s: Failed to restart CU, resetting board...\n",dev->name);
1275                                         eexp_hw_init586(dev);
1276                                         netif_wake_queue(dev);
1277                                         return;
1278                                 }
1279                         }
1280                 }
1281         }
1282 }
1283
1284 /*
1285  * Writes down the list of transmit buffers into card memory.  Each
1286  * entry consists of an 82586 transmit command, followed by a jump
1287  * pointing to itself.  When we want to transmit a packet, we write
1288  * the data into the appropriate transmit buffer and then modify the
1289  * preceding jump to point at the new transmit command.  This means that
1290  * the 586 command unit is continuously active.
1291  */
1292
1293 static void eexp_hw_txinit(struct net_device *dev)
1294 {
1295         struct net_local *lp = netdev_priv(dev);
1296         unsigned short tx_block = TX_BUF_START;
1297         unsigned short curtbuf;
1298         unsigned short ioaddr = dev->base_addr;
1299
1300         for ( curtbuf=0 ; curtbuf<lp->num_tx_bufs ; curtbuf++ )
1301         {
1302                 outw(tx_block, ioaddr + WRITE_PTR);
1303
1304                 outw(0x0000, ioaddr + DATAPORT);
1305                 outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1306                 outw(tx_block+0x08, ioaddr + DATAPORT);
1307                 outw(tx_block+0x0e, ioaddr + DATAPORT);
1308
1309                 outw(0x0000, ioaddr + DATAPORT);
1310                 outw(0x0000, ioaddr + DATAPORT);
1311                 outw(tx_block+0x08, ioaddr + DATAPORT);
1312
1313                 outw(0x8000, ioaddr + DATAPORT);
1314                 outw(-1, ioaddr + DATAPORT);
1315                 outw(tx_block+0x16, ioaddr + DATAPORT);
1316                 outw(0x0000, ioaddr + DATAPORT);
1317
1318                 tx_block += TX_BUF_SIZE;
1319         }
1320         lp->tx_head = TX_BUF_START;
1321         lp->tx_reap = TX_BUF_START;
1322         lp->tx_tail = tx_block - TX_BUF_SIZE;
1323         lp->tx_link = lp->tx_tail + 0x08;
1324         lp->rx_buf_start = tx_block;
1325
1326 }
1327
1328 /*
1329  * Write the circular list of receive buffer descriptors to card memory.
1330  * The end of the list isn't marked, which means that the 82586 receive
1331  * unit will loop until buffers become available (this avoids it giving us
1332  * "out of resources" messages).
1333  */
1334
1335 static void eexp_hw_rxinit(struct net_device *dev)
1336 {
1337         struct net_local *lp = netdev_priv(dev);
1338         unsigned short rx_block = lp->rx_buf_start;
1339         unsigned short ioaddr = dev->base_addr;
1340
1341         lp->num_rx_bufs = 0;
1342         lp->rx_first = lp->rx_ptr = rx_block;
1343         do
1344         {
1345                 lp->num_rx_bufs++;
1346
1347                 outw(rx_block, ioaddr + WRITE_PTR);
1348
1349                 outw(0, ioaddr + DATAPORT);  outw(0, ioaddr+DATAPORT);
1350                 outw(rx_block + RX_BUF_SIZE, ioaddr+DATAPORT);
1351                 outw(0xffff, ioaddr+DATAPORT);
1352
1353                 outw(0x0000, ioaddr+DATAPORT);
1354                 outw(0xdead, ioaddr+DATAPORT);
1355                 outw(0xdead, ioaddr+DATAPORT);
1356                 outw(0xdead, ioaddr+DATAPORT);
1357                 outw(0xdead, ioaddr+DATAPORT);
1358                 outw(0xdead, ioaddr+DATAPORT);
1359                 outw(0xdead, ioaddr+DATAPORT);
1360
1361                 outw(0x0000, ioaddr+DATAPORT);
1362                 outw(rx_block + RX_BUF_SIZE + 0x16, ioaddr+DATAPORT);
1363                 outw(rx_block + 0x20, ioaddr+DATAPORT);
1364                 outw(0, ioaddr+DATAPORT);
1365                 outw(RX_BUF_SIZE-0x20, ioaddr+DATAPORT);
1366
1367                 lp->rx_last = rx_block;
1368                 rx_block += RX_BUF_SIZE;
1369         } while (rx_block <= lp->rx_buf_end-RX_BUF_SIZE);
1370
1371
1372         /* Make first Rx frame descriptor point to first Rx buffer
1373            descriptor */
1374         outw(lp->rx_first + 6, ioaddr+WRITE_PTR);
1375         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1376
1377         /* Close Rx frame descriptor ring */
1378         outw(lp->rx_last + 4, ioaddr+WRITE_PTR);
1379         outw(lp->rx_first, ioaddr+DATAPORT);
1380
1381         /* Close Rx buffer descriptor ring */
1382         outw(lp->rx_last + 0x16 + 2, ioaddr+WRITE_PTR);
1383         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1384
1385 }
1386
1387 /*
1388  * Un-reset the 586, and start the configuration sequence. We don't wait for
1389  * this to finish, but allow the interrupt handler to start the CU and RU for
1390  * us.  We can't start the receive/transmission system up before we know that
1391  * the hardware is configured correctly.
1392  */
1393
1394 static void eexp_hw_init586(struct net_device *dev)
1395 {
1396         struct net_local *lp = netdev_priv(dev);
1397         unsigned short ioaddr = dev->base_addr;
1398         int i;
1399
1400 #if NET_DEBUG > 6
1401         printk("%s: eexp_hw_init586()\n", dev->name);
1402 #endif
1403
1404         lp->started = 0;
1405
1406         set_loopback(dev);
1407
1408         outb(SIRQ_dis|irqrmap[dev->irq],ioaddr+SET_IRQ);
1409
1410         /* Download the startup code */
1411         outw(lp->rx_buf_end & ~31, ioaddr + SM_PTR);
1412         outw(lp->width?0x0001:0x0000, ioaddr + 0x8006);
1413         outw(0x0000, ioaddr + 0x8008);
1414         outw(0x0000, ioaddr + 0x800a);
1415         outw(0x0000, ioaddr + 0x800c);
1416         outw(0x0000, ioaddr + 0x800e);
1417
1418         for (i = 0; i < ARRAY_SIZE(start_code) * 2; i+=32) {
1419                 int j;
1420                 outw(i, ioaddr + SM_PTR);
1421                 for (j = 0; j < 16 && (i+j)/2 < ARRAY_SIZE(start_code); j+=2)
1422                         outw(start_code[(i+j)/2],
1423                              ioaddr+0x4000+j);
1424                 for (j = 0; j < 16 && (i+j+16)/2 < ARRAY_SIZE(start_code); j+=2)
1425                         outw(start_code[(i+j+16)/2],
1426                              ioaddr+0x8000+j);
1427         }
1428
1429         /* Do we want promiscuous mode or multicast? */
1430         outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1431         i = inw(ioaddr+SHADOW(CONF_PROMISC));
1432         outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1433              ioaddr+SHADOW(CONF_PROMISC));
1434         lp->was_promisc = dev->flags & IFF_PROMISC;
1435 #if 0
1436         eexp_setup_filter(dev);
1437 #endif
1438
1439         /* Write our hardware address */
1440         outw(CONF_HWADDR & ~31, ioaddr+SM_PTR);
1441         outw(((unsigned short *)dev->dev_addr)[0], ioaddr+SHADOW(CONF_HWADDR));
1442         outw(((unsigned short *)dev->dev_addr)[1],
1443              ioaddr+SHADOW(CONF_HWADDR+2));
1444         outw(((unsigned short *)dev->dev_addr)[2],
1445              ioaddr+SHADOW(CONF_HWADDR+4));
1446
1447         eexp_hw_txinit(dev);
1448         eexp_hw_rxinit(dev);
1449
1450         outb(0,ioaddr+EEPROM_Ctrl);
1451         mdelay(5);
1452
1453         scb_command(dev, 0xf000);
1454         outb(0,ioaddr+SIGNAL_CA);
1455
1456         outw(0, ioaddr+SM_PTR);
1457
1458         {
1459                 unsigned short rboguscount=50,rfailcount=5;
1460                 while (inw(ioaddr+0x4000))
1461                 {
1462                         if (!--rboguscount)
1463                         {
1464                                 printk(KERN_WARNING "%s: i82586 reset timed out, kicking...\n",
1465                                         dev->name);
1466                                 scb_command(dev, 0);
1467                                 outb(0,ioaddr+SIGNAL_CA);
1468                                 rboguscount = 100;
1469                                 if (!--rfailcount)
1470                                 {
1471                                         printk(KERN_WARNING "%s: i82586 not responding, giving up.\n",
1472                                                 dev->name);
1473                                         return;
1474                                 }
1475                         }
1476                 }
1477         }
1478
1479         scb_wrcbl(dev, CONF_LINK);
1480         scb_command(dev, 0xf000|SCB_CUstart);
1481         outb(0,ioaddr+SIGNAL_CA);
1482
1483         {
1484                 unsigned short iboguscount=50,ifailcount=5;
1485                 while (!scb_status(dev))
1486                 {
1487                         if (!--iboguscount)
1488                         {
1489                                 if (--ifailcount)
1490                                 {
1491                                         printk(KERN_WARNING "%s: i82586 initialization timed out, status %04x, cmd %04x\n",
1492                                                 dev->name, scb_status(dev), scb_rdcmd(dev));
1493                                         scb_wrcbl(dev, CONF_LINK);
1494                                         scb_command(dev, 0xf000|SCB_CUstart);
1495                                         outb(0,ioaddr+SIGNAL_CA);
1496                                         iboguscount = 100;
1497                                 }
1498                                 else
1499                                 {
1500                                         printk(KERN_WARNING "%s: Failed to initialize i82586, giving up.\n",dev->name);
1501                                         return;
1502                                 }
1503                         }
1504                 }
1505         }
1506
1507         clear_loopback(dev);
1508         outb(SIRQ_en|irqrmap[dev->irq],ioaddr+SET_IRQ);
1509
1510         lp->init_time = jiffies;
1511 #if NET_DEBUG > 6
1512         printk("%s: leaving eexp_hw_init586()\n", dev->name);
1513 #endif
1514 }
1515
1516 static void eexp_setup_filter(struct net_device *dev)
1517 {
1518         struct netdev_hw_addr *ha;
1519         unsigned short ioaddr = dev->base_addr;
1520         int count = netdev_mc_count(dev);
1521         int i;
1522         if (count > 8) {
1523                 printk(KERN_INFO "%s: too many multicast addresses (%d)\n",
1524                        dev->name, count);
1525                 count = 8;
1526         }
1527
1528         outw(CONF_NR_MULTICAST & ~31, ioaddr+SM_PTR);
1529         outw(6*count, ioaddr+SHADOW(CONF_NR_MULTICAST));
1530         i = 0;
1531         netdev_for_each_mc_addr(ha, dev) {
1532                 unsigned short *data = (unsigned short *) ha->addr;
1533
1534                 if (i == count)
1535                         break;
1536                 outw((CONF_MULTICAST+(6*i)) & ~31, ioaddr+SM_PTR);
1537                 outw(data[0], ioaddr+SHADOW(CONF_MULTICAST+(6*i)));
1538                 outw((CONF_MULTICAST+(6*i)+2) & ~31, ioaddr+SM_PTR);
1539                 outw(data[1], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+2));
1540                 outw((CONF_MULTICAST+(6*i)+4) & ~31, ioaddr+SM_PTR);
1541                 outw(data[2], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+4));
1542                 i++;
1543         }
1544 }
1545
1546 /*
1547  * Set or clear the multicast filter for this adaptor.
1548  */
1549 static void
1550 eexp_set_multicast(struct net_device *dev)
1551 {
1552         unsigned short ioaddr = dev->base_addr;
1553         struct net_local *lp = netdev_priv(dev);
1554         int kick = 0, i;
1555         if ((dev->flags & IFF_PROMISC) != lp->was_promisc) {
1556                 outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1557                 i = inw(ioaddr+SHADOW(CONF_PROMISC));
1558                 outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1559                      ioaddr+SHADOW(CONF_PROMISC));
1560                 lp->was_promisc = dev->flags & IFF_PROMISC;
1561                 kick = 1;
1562         }
1563         if (!(dev->flags & IFF_PROMISC)) {
1564                 eexp_setup_filter(dev);
1565                 if (lp->old_mc_count != netdev_mc_count(dev)) {
1566                         kick = 1;
1567                         lp->old_mc_count = netdev_mc_count(dev);
1568                 }
1569         }
1570         if (kick) {
1571                 unsigned long oj;
1572                 scb_command(dev, SCB_CUsuspend);
1573                 outb(0, ioaddr+SIGNAL_CA);
1574                 outb(0, ioaddr+SIGNAL_CA);
1575 #if 0
1576                 printk("%s: waiting for CU to go suspended\n", dev->name);
1577 #endif
1578                 oj = jiffies;
1579                 while ((SCB_CUstat(scb_status(dev)) == 2) &&
1580                        (time_before(jiffies, oj + 2000)));
1581                 if (SCB_CUstat(scb_status(dev)) == 2)
1582                         printk("%s: warning, CU didn't stop\n", dev->name);
1583                 lp->started &= ~(STARTED_CU);
1584                 scb_wrcbl(dev, CONF_LINK);
1585                 scb_command(dev, SCB_CUstart);
1586                 outb(0, ioaddr+SIGNAL_CA);
1587         }
1588 }
1589
1590
1591 /*
1592  * MODULE stuff
1593  */
1594
1595 #ifdef MODULE
1596
1597 #define EEXP_MAX_CARDS     4    /* max number of cards to support */
1598
1599 static struct net_device *dev_eexp[EEXP_MAX_CARDS];
1600 static int irq[EEXP_MAX_CARDS];
1601 static int io[EEXP_MAX_CARDS];
1602
1603 module_param_array(io, int, NULL, 0);
1604 module_param_array(irq, int, NULL, 0);
1605 MODULE_PARM_DESC(io, "EtherExpress 16 I/O base address(es)");
1606 MODULE_PARM_DESC(irq, "EtherExpress 16 IRQ number(s)");
1607 MODULE_LICENSE("GPL");
1608
1609
1610 /* Ideally the user would give us io=, irq= for every card.  If any parameters
1611  * are specified, we verify and then use them.  If no parameters are given, we
1612  * autoprobe for one card only.
1613  */
1614 int __init init_module(void)
1615 {
1616         struct net_device *dev;
1617         int this_dev, found = 0;
1618
1619         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1620                 dev = alloc_etherdev(sizeof(struct net_local));
1621                 dev->irq = irq[this_dev];
1622                 dev->base_addr = io[this_dev];
1623                 if (io[this_dev] == 0) {
1624                         if (this_dev)
1625                                 break;
1626                         printk(KERN_NOTICE "eexpress.c: Module autoprobe not recommended, give io=xx.\n");
1627                 }
1628                 if (do_express_probe(dev) == 0) {
1629                         dev_eexp[this_dev] = dev;
1630                         found++;
1631                         continue;
1632                 }
1633                 printk(KERN_WARNING "eexpress.c: Failed to register card at 0x%x.\n", io[this_dev]);
1634                 free_netdev(dev);
1635                 break;
1636         }
1637         if (found)
1638                 return 0;
1639         return -ENXIO;
1640 }
1641
1642 void __exit cleanup_module(void)
1643 {
1644         int this_dev;
1645
1646         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1647                 struct net_device *dev = dev_eexp[this_dev];
1648                 if (dev) {
1649                         unregister_netdev(dev);
1650                         free_netdev(dev);
1651                 }
1652         }
1653 }
1654 #endif
1655
1656 /*
1657  * Local Variables:
1658  *  c-file-style: "linux"
1659  *  tab-width: 8
1660  * End:
1661  */