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
  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/mca-legacy.h>
 115 #include <linux/spinlock.h>
 116 #include <linux/bitops.h>
 117 #include <linux/jiffies.h>
 118
 119 #include <asm/io.h>
 120 #include <asm/irq.h>
 121
 122 #ifndef NET_DEBUG
 123 #define NET_DEBUG 4
 124 #endif
 125
 126 #include "eexpress.h"
 127
 128 #define EEXP_IO_EXTENT  16
 129
 130 /*
 131  * Private data declarations
 132  */
 133
 134 struct net_local
 135 {
 136         unsigned long last_tx;       /* jiffies when last transmit started */
 137         unsigned long init_time;     /* jiffies when eexp_hw_init586 called */
 138         unsigned short rx_first;     /* first rx buf, same as RX_BUF_START */
 139         unsigned short rx_last;      /* last rx buf */
 140         unsigned short rx_ptr;       /* first rx buf to look at */
 141         unsigned short tx_head;      /* next free tx buf */
 142         unsigned short tx_reap;      /* first in-use tx buf */
 143         unsigned short tx_tail;      /* previous tx buf to tx_head */
 144         unsigned short tx_link;      /* last known-executing tx buf */
 145         unsigned short last_tx_restart;   /* set to tx_link when we
 146                                              restart the CU */
 147         unsigned char started;
 148         unsigned short rx_buf_start;
 149         unsigned short rx_buf_end;
 150         unsigned short num_tx_bufs;
 151         unsigned short num_rx_bufs;
 152         unsigned char width;         /* 0 for 16bit, 1 for 8bit */
 153         unsigned char was_promisc;
 154         unsigned char old_mc_count;
 155         spinlock_t lock;
 156 };
 157
 158 /* This is the code and data that is downloaded to the EtherExpress card's
 159  * memory at boot time.
 160  */
 161
 162 static unsigned short start_code[] = {
 163 /* 0x0000 */
 164         0x0001,                 /* ISCP: busy - cleared after reset */
 165         0x0008,0x0000,0x0000,   /* offset,address (lo,hi) of SCB */
 166
 167         0x0000,0x0000,          /* SCB: status, commands */
 168         0x0000,0x0000,          /* links to first command block,
 169                                    first receive descriptor */
 170         0x0000,0x0000,          /* CRC error, alignment error counts */
 171         0x0000,0x0000,          /* out of resources, overrun error counts */
 172
 173         0x0000,0x0000,          /* pad */
 174         0x0000,0x0000,
 175
 176 /* 0x20 -- start of 82586 CU program */
 177 #define CONF_LINK 0x20
 178         0x0000,Cmd_Config,
 179         0x0032,                 /* link to next command */
 180         0x080c,                 /* 12 bytes follow : fifo threshold=8 */
 181         0x2e40,                 /* don't rx bad frames
 182                                  * SRDY/ARDY => ext. sync. : preamble len=8
 183                                  * take addresses from data buffers
 184                                  * 6 bytes/address
 185                                  */
 186         0x6000,                 /* default backoff method & priority
 187                                  * interframe spacing = 0x60 */
 188         0xf200,                 /* slot time=0x200
 189                                  * max collision retry = 0xf */
 190 #define CONF_PROMISC  0x2e
 191         0x0000,                 /* no HDLC : normal CRC : enable broadcast
 192                                  * disable promiscuous/multicast modes */
 193         0x003c,                 /* minimum frame length = 60 octets) */
 194
 195         0x0000,Cmd_SetAddr,
 196         0x003e,                 /* link to next command */
 197 #define CONF_HWADDR  0x38
 198         0x0000,0x0000,0x0000,   /* hardware address placed here */
 199
 200         0x0000,Cmd_MCast,
 201         0x0076,                 /* link to next command */
 202 #define CONF_NR_MULTICAST 0x44
 203         0x0000,                 /* number of bytes in multicast address(es) */
 204 #define CONF_MULTICAST 0x46
 205         0x0000, 0x0000, 0x0000, /* some addresses */
 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         0x0000, 0x0000, 0x0000,
 213
 214 #define CONF_DIAG_RESULT  0x76
 215         0x0000, Cmd_Diag,
 216         0x007c,                 /* link to next command */
 217
 218         0x0000,Cmd_TDR|Cmd_INT,
 219         0x0084,
 220 #define CONF_TDR_RESULT  0x82
 221         0x0000,
 222
 223         0x0000,Cmd_END|Cmd_Nop, /* end of configure sequence */
 224         0x0084                  /* dummy link */
 225 };
 226
 227 /* maps irq number to EtherExpress magic value */
 228 static char irqrmap[] = { 0,0,1,2,3,4,0,0,0,1,5,6,0,0,0,0 };
 229
 230 #ifdef CONFIG_MCA_LEGACY
 231 /* mapping of the first four bits of the second POS register */
 232 static unsigned short mca_iomap[] = {
 233         0x270, 0x260, 0x250, 0x240, 0x230, 0x220, 0x210, 0x200,
 234         0x370, 0x360, 0x350, 0x340, 0x330, 0x320, 0x310, 0x300
 235 };
 236 /* bits 5-7 of the second POS register */
 237 static char mca_irqmap[] = { 12, 9, 3, 4, 5, 10, 11, 15 };
 238 #endif
 239
 240 /*
 241  * Prototypes for Linux interface
 242  */
 243
 244 static int eexp_open(struct net_device *dev);
 245 static int eexp_close(struct net_device *dev);
 246 static void eexp_timeout(struct net_device *dev);
 247 static netdev_tx_t eexp_xmit(struct sk_buff *buf,
 248                              struct net_device *dev);
 249
 250 static irqreturn_t eexp_irq(int irq, void *dev_addr);
 251 static void eexp_set_multicast(struct net_device *dev);
 252
 253 /*
 254  * Prototypes for hardware access functions
 255  */
 256
 257 static void eexp_hw_rx_pio(struct net_device *dev);
 258 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
 259                        unsigned short len);
 260 static int eexp_hw_probe(struct net_device *dev,unsigned short ioaddr);
 261 static unsigned short eexp_hw_readeeprom(unsigned short ioaddr,
 262                                          unsigned char location);
 263
 264 static unsigned short eexp_hw_lasttxstat(struct net_device *dev);
 265 static void eexp_hw_txrestart(struct net_device *dev);
 266
 267 static void eexp_hw_txinit    (struct net_device *dev);
 268 static void eexp_hw_rxinit    (struct net_device *dev);
 269
 270 static void eexp_hw_init586   (struct net_device *dev);
 271 static void eexp_setup_filter (struct net_device *dev);
 272
 273 static char *eexp_ifmap[]={"AUI", "BNC", "RJ45"};
 274 enum eexp_iftype {AUI=0, BNC=1, TPE=2};
 275
 276 #define STARTED_RU      2
 277 #define STARTED_CU      1
 278
 279 /*
 280  * Primitive hardware access functions.
 281  */
 282
 283 static inline unsigned short scb_status(struct net_device *dev)
 284 {
 285         return inw(dev->base_addr + 0xc008);
 286 }
 287
 288 static inline unsigned short scb_rdcmd(struct net_device *dev)
 289 {
 290         return inw(dev->base_addr + 0xc00a);
 291 }
 292
 293 static inline void scb_command(struct net_device *dev, unsigned short cmd)
 294 {
 295         outw(cmd, dev->base_addr + 0xc00a);
 296 }
 297
 298 static inline void scb_wrcbl(struct net_device *dev, unsigned short val)
 299 {
 300         outw(val, dev->base_addr + 0xc00c);
 301 }
 302
 303 static inline void scb_wrrfa(struct net_device *dev, unsigned short val)
 304 {
 305         outw(val, dev->base_addr + 0xc00e);
 306 }
 307
 308 static inline void set_loopback(struct net_device *dev)
 309 {
 310         outb(inb(dev->base_addr + Config) | 2, dev->base_addr + Config);
 311 }
 312
 313 static inline void clear_loopback(struct net_device *dev)
 314 {
 315         outb(inb(dev->base_addr + Config) & ~2, dev->base_addr + Config);
 316 }
 317
 318 static inline unsigned short int SHADOW(short int addr)
 319 {
 320         addr &= 0x1f;
 321         if (addr > 0xf) addr += 0x3ff0;
 322         return addr + 0x4000;
 323 }
 324
 325 /*
 326  * Linux interface
 327  */
 328
 329 /*
 330  * checks for presence of EtherExpress card
 331  */
 332
 333 static int __init do_express_probe(struct net_device *dev)
 334 {
 335         unsigned short *port;
 336         static unsigned short ports[] = { 0x240,0x300,0x310,0x270,0x320,0x340,0 };
 337         unsigned short ioaddr = dev->base_addr;
 338         int dev_irq = dev->irq;
 339         int err;
 340
 341         dev->if_port = 0xff; /* not set */
 342
 343 #ifdef CONFIG_MCA_LEGACY
 344         if (MCA_bus) {
 345                 int slot = 0;
 346
 347                 /*
 348                  * Only find one card at a time.  Subsequent calls
 349                  * will find others, however, proper multicard MCA
 350                  * probing and setup can't be done with the
 351                  * old-style Space.c init routines.  -- ASF
 352                  */
 353                 while (slot != MCA_NOTFOUND) {
 354                         int pos0, pos1;
 355
 356                         slot = mca_find_unused_adapter(0x628B, slot);
 357                         if (slot == MCA_NOTFOUND)
 358                                 break;
 359
 360                         pos0 = mca_read_stored_pos(slot, 2);
 361                         pos1 = mca_read_stored_pos(slot, 3);
 362                         ioaddr = mca_iomap[pos1&0xf];
 363
 364                         dev->irq = mca_irqmap[(pos1>>4)&0x7];
 365
 366                         /*
 367                          * XXX: Transceiver selection is done
 368                          * differently on the MCA version.
 369                          * How to get it to select something
 370                          * other than external/AUI is currently
 371                          * unknown.  This code is just for looks. -- ASF
 372                          */
 373                         if ((pos0 & 0x7) == 0x1)
 374                                 dev->if_port = AUI;
 375                         else if ((pos0 & 0x7) == 0x5) {
 376                                 if (pos1 & 0x80)
 377                                         dev->if_port = BNC;
 378                                 else
 379                                         dev->if_port = TPE;
 380                         }
 381
 382                         mca_set_adapter_name(slot, "Intel EtherExpress 16 MCA");
 383                         mca_set_adapter_procfn(slot, NULL, dev);
 384                         mca_mark_as_used(slot);
 385
 386                         break;
 387                 }
 388         }
 389 #endif
 390         if (ioaddr&0xfe00) {
 391                 if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress"))
 392                         return -EBUSY;
 393                 err = eexp_hw_probe(dev,ioaddr);
 394                 release_region(ioaddr, EEXP_IO_EXTENT);
 395                 return err;
 396         } else if (ioaddr)
 397                 return -ENXIO;
 398
 399         for (port=&ports[0] ; *port ; port++ )
 400         {
 401                 unsigned short sum = 0;
 402                 int i;
 403                 if (!request_region(*port, EEXP_IO_EXTENT, "EtherExpress"))
 404                         continue;
 405                 for ( i=0 ; i<4 ; i++ )
 406                 {
 407                         unsigned short t;
 408                         t = inb(*port + ID_PORT);
 409                         sum |= (t>>4) << ((t & 0x03)<<2);
 410                 }
 411                 if (sum==0xbaba && !eexp_hw_probe(dev,*port)) {
 412                         release_region(*port, EEXP_IO_EXTENT);
 413                         return 0;
 414                 }
 415                 release_region(*port, EEXP_IO_EXTENT);
 416                 dev->irq = dev_irq;
 417         }
 418         return -ENODEV;
 419 }
 420
 421 #ifndef MODULE
 422 struct net_device * __init express_probe(int unit)
 423 {
 424         struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
 425         int err;
 426
 427         if (!dev)
 428                 return ERR_PTR(-ENOMEM);
 429
 430         sprintf(dev->name, "eth%d", unit);
 431         netdev_boot_setup_check(dev);
 432
 433         err = do_express_probe(dev);
 434         if (!err)
 435                 return dev;
 436         free_netdev(dev);
 437         return ERR_PTR(err);
 438 }
 439 #endif
 440
 441 /*
 442  * open and initialize the adapter, ready for use
 443  */
 444
 445 static int eexp_open(struct net_device *dev)
 446 {
 447         int ret;
 448         unsigned short ioaddr = dev->base_addr;
 449         struct net_local *lp = netdev_priv(dev);
 450
 451 #if NET_DEBUG > 6
 452         printk(KERN_DEBUG "%s: eexp_open()\n", dev->name);
 453 #endif
 454
 455         if (!dev->irq || !irqrmap[dev->irq])
 456                 return -ENXIO;
 457
 458         ret = request_irq(dev->irq, eexp_irq, 0, dev->name, dev);
 459         if (ret)
 460                 return ret;
 461
 462         if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress")) {
 463                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 464                         , ioaddr);
 465                 goto err_out1;
 466         }
 467         if (!request_region(ioaddr+0x4000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 468                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 469                         , ioaddr+0x4000);
 470                 goto err_out2;
 471         }
 472         if (!request_region(ioaddr+0x8000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 473                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 474                         , ioaddr+0x8000);
 475                 goto err_out3;
 476         }
 477         if (!request_region(ioaddr+0xc000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 478                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 479                         , ioaddr+0xc000);
 480                 goto err_out4;
 481         }
 482
 483         if (lp->width) {
 484                 printk("%s: forcing ASIC to 8-bit mode\n", dev->name);
 485                 outb(inb(dev->base_addr+Config)&~4, dev->base_addr+Config);
 486         }
 487
 488         eexp_hw_init586(dev);
 489         netif_start_queue(dev);
 490 #if NET_DEBUG > 6
 491         printk(KERN_DEBUG "%s: leaving eexp_open()\n", dev->name);
 492 #endif
 493         return 0;
 494
 495         err_out4:
 496                 release_region(ioaddr+0x8000, EEXP_IO_EXTENT);
 497         err_out3:
 498                 release_region(ioaddr+0x4000, EEXP_IO_EXTENT);
 499         err_out2:
 500                 release_region(ioaddr, EEXP_IO_EXTENT);
 501         err_out1:
 502                 free_irq(dev->irq, dev);
 503                 return -EBUSY;
 504 }
 505
 506 /*
 507  * close and disable the interface, leaving the 586 in reset.
 508  */
 509
 510 static int eexp_close(struct net_device *dev)
 511 {
 512         unsigned short ioaddr = dev->base_addr;
 513         struct net_local *lp = netdev_priv(dev);
 514
 515         int irq = dev->irq;
 516
 517         netif_stop_queue(dev);
 518
 519         outb(SIRQ_dis|irqrmap[irq],ioaddr+SET_IRQ);
 520         lp->started = 0;
 521         scb_command(dev, SCB_CUsuspend|SCB_RUsuspend);
 522         outb(0,ioaddr+SIGNAL_CA);
 523         free_irq(irq,dev);
 524         outb(i586_RST,ioaddr+EEPROM_Ctrl);
 525         release_region(ioaddr, EEXP_IO_EXTENT);
 526         release_region(ioaddr+0x4000, 16);
 527         release_region(ioaddr+0x8000, 16);
 528         release_region(ioaddr+0xc000, 16);
 529
 530         return 0;
 531 }
 532
 533 /*
 534  * This gets called when a higher level thinks we are broken.  Check that
 535  * nothing has become jammed in the CU.
 536  */
 537
 538 static void unstick_cu(struct net_device *dev)
 539 {
 540         struct net_local *lp = netdev_priv(dev);
 541         unsigned short ioaddr = dev->base_addr;
 542
 543         if (lp->started)
 544         {
 545                 if (time_after(jiffies, dev_trans_start(dev) + HZ/2))
 546                 {
 547                         if (lp->tx_link==lp->last_tx_restart)
 548                         {
 549                                 unsigned short boguscount=200,rsst;
 550                                 printk(KERN_WARNING "%s: Retransmit timed out, status %04x, resetting...\n",
 551                                        dev->name, scb_status(dev));
 552                                 eexp_hw_txinit(dev);
 553                                 lp->last_tx_restart = 0;
 554                                 scb_wrcbl(dev, lp->tx_link);
 555                                 scb_command(dev, SCB_CUstart);
 556                                 outb(0,ioaddr+SIGNAL_CA);
 557                                 while (!SCB_complete(rsst=scb_status(dev)))
 558                                 {
 559                                         if (!--boguscount)
 560                                         {
 561                                                 boguscount=200;
 562                                                 printk(KERN_WARNING "%s: Reset timed out status %04x, retrying...\n",
 563                                                        dev->name,rsst);
 564                                                 scb_wrcbl(dev, lp->tx_link);
 565                                                 scb_command(dev, SCB_CUstart);
 566                                                 outb(0,ioaddr+SIGNAL_CA);
 567                                         }
 568                                 }
 569                                 netif_wake_queue(dev);
 570                         }
 571                         else
 572                         {
 573                                 unsigned short status = scb_status(dev);
 574                                 if (SCB_CUdead(status))
 575                                 {
 576                                         unsigned short txstatus = eexp_hw_lasttxstat(dev);
 577                                         printk(KERN_WARNING "%s: Transmit timed out, CU not active status %04x %04x, restarting...\n",
 578                                                dev->name, status, txstatus);
 579                                         eexp_hw_txrestart(dev);
 580                                 }
 581                                 else
 582                                 {
 583                                         unsigned short txstatus = eexp_hw_lasttxstat(dev);
 584                                         if (netif_queue_stopped(dev) && !txstatus)
 585                                         {
 586                                                 printk(KERN_WARNING "%s: CU wedged, status %04x %04x, resetting...\n",
 587                                                        dev->name,status,txstatus);
 588                                                 eexp_hw_init586(dev);
 589                                                 netif_wake_queue(dev);
 590                                         }
 591                                         else
 592                                         {
 593                                                 printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
 594                                         }
 595                                 }
 596                         }
 597                 }
 598         }
 599         else
 600         {
 601                 if (time_after(jiffies, lp->init_time + 10))
 602                 {
 603                         unsigned short status = scb_status(dev);
 604                         printk(KERN_WARNING "%s: i82586 startup timed out, status %04x, resetting...\n",
 605                                dev->name, status);
 606                         eexp_hw_init586(dev);
 607                         netif_wake_queue(dev);
 608                 }
 609         }
 610 }
 611
 612 static void eexp_timeout(struct net_device *dev)
 613 {
 614         struct net_local *lp = netdev_priv(dev);
 615 #ifdef CONFIG_SMP
 616         unsigned long flags;
 617 #endif
 618         int status;
 619
 620         disable_irq(dev->irq);
 621
 622         /*
 623          *      Best would be to use synchronize_irq(); spin_lock() here
 624          *      lets make it work first..
 625          */
 626
 627 #ifdef CONFIG_SMP
 628         spin_lock_irqsave(&lp->lock, flags);
 629 #endif
 630
 631         status = scb_status(dev);
 632         unstick_cu(dev);
 633         printk(KERN_INFO "%s: transmit timed out, %s?\n", dev->name,
 634                (SCB_complete(status)?"lost interrupt":
 635                 "board on fire"));
 636         dev->stats.tx_errors++;
 637         lp->last_tx = jiffies;
 638         if (!SCB_complete(status)) {
 639                 scb_command(dev, SCB_CUabort);
 640                 outb(0,dev->base_addr+SIGNAL_CA);
 641         }
 642         netif_wake_queue(dev);
 643 #ifdef CONFIG_SMP
 644         spin_unlock_irqrestore(&lp->lock, flags);
 645 #endif
 646 }
 647
 648 /*
 649  * Called to transmit a packet, or to allow us to right ourselves
 650  * if the kernel thinks we've died.
 651  */
 652 static netdev_tx_t eexp_xmit(struct sk_buff *buf, struct net_device *dev)
 653 {
 654         short length = buf->len;
 655 #ifdef CONFIG_SMP
 656         struct net_local *lp = netdev_priv(dev);
 657         unsigned long flags;
 658 #endif
 659
 660 #if NET_DEBUG > 6
 661         printk(KERN_DEBUG "%s: eexp_xmit()\n", dev->name);
 662 #endif
 663
 664         if (buf->len < ETH_ZLEN) {
 665                 if (skb_padto(buf, ETH_ZLEN))
 666                         return NETDEV_TX_OK;
 667                 length = ETH_ZLEN;
 668         }
 669
 670         disable_irq(dev->irq);
 671
 672         /*
 673          *      Best would be to use synchronize_irq(); spin_lock() here
 674          *      lets make it work first..
 675          */
 676
 677 #ifdef CONFIG_SMP
 678         spin_lock_irqsave(&lp->lock, flags);
 679 #endif
 680
 681         {
 682                 unsigned short *data = (unsigned short *)buf->data;
 683
 684                 dev->stats.tx_bytes += length;
 685
 686                 eexp_hw_tx_pio(dev,data,length);
 687         }
 688         dev_kfree_skb(buf);
 689 #ifdef CONFIG_SMP
 690         spin_unlock_irqrestore(&lp->lock, flags);
 691 #endif
 692         enable_irq(dev->irq);
 693         return NETDEV_TX_OK;
 694 }
 695
 696 /*
 697  * Handle an EtherExpress interrupt
 698  * If we've finished initializing, start the RU and CU up.
 699  * If we've already started, reap tx buffers, handle any received packets,
 700  * check to make sure we've not become wedged.
 701  */
 702
 703 static unsigned short eexp_start_irq(struct net_device *dev,
 704                                      unsigned short status)
 705 {
 706         unsigned short ack_cmd = SCB_ack(status);
 707         struct net_local *lp = netdev_priv(dev);
 708         unsigned short ioaddr = dev->base_addr;
 709         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_CU)) {
 710                 short diag_status, tdr_status;
 711                 while (SCB_CUstat(status)==2)
 712                         status = scb_status(dev);
 713 #if NET_DEBUG > 4
 714                 printk("%s: CU went non-active (status %04x)\n",
 715                        dev->name, status);
 716 #endif
 717
 718                 outw(CONF_DIAG_RESULT & ~31, ioaddr + SM_PTR);
 719                 diag_status = inw(ioaddr + SHADOW(CONF_DIAG_RESULT));
 720                 if (diag_status & 1<<11) {
 721                         printk(KERN_WARNING "%s: 82586 failed self-test\n",
 722                                dev->name);
 723                 } else if (!(diag_status & 1<<13)) {
 724                         printk(KERN_WARNING "%s: 82586 self-test failed to complete\n", dev->name);
 725                 }
 726
 727                 outw(CONF_TDR_RESULT & ~31, ioaddr + SM_PTR);
 728                 tdr_status = inw(ioaddr + SHADOW(CONF_TDR_RESULT));
 729                 if (tdr_status & (TDR_SHORT|TDR_OPEN)) {
 730                         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" : "");
 731                 }
 732                 else if (tdr_status & TDR_XCVRPROBLEM) {
 733                         printk(KERN_WARNING "%s: TDR reports transceiver problem\n", dev->name);
 734                 }
 735                 else if (tdr_status & TDR_LINKOK) {
 736 #if NET_DEBUG > 4
 737                         printk(KERN_DEBUG "%s: TDR reports link OK\n", dev->name);
 738 #endif
 739                 } else {
 740                         printk("%s: TDR is ga-ga (status %04x)\n", dev->name,
 741                                tdr_status);
 742                 }
 743
 744                 lp->started |= STARTED_CU;
 745                 scb_wrcbl(dev, lp->tx_link);
 746                 /* if the RU isn't running, start it now */
 747                 if (!(lp->started & STARTED_RU)) {
 748                         ack_cmd |= SCB_RUstart;
 749                         scb_wrrfa(dev, lp->rx_buf_start);
 750                         lp->rx_ptr = lp->rx_buf_start;
 751                         lp->started |= STARTED_RU;
 752                 }
 753                 ack_cmd |= SCB_CUstart | 0x2000;
 754         }
 755
 756         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_RU) && SCB_RUstat(status)==4)
 757                 lp->started|=STARTED_RU;
 758
 759         return ack_cmd;
 760 }
 761
 762 static void eexp_cmd_clear(struct net_device *dev)
 763 {
 764         unsigned long int oldtime = jiffies;
 765         while (scb_rdcmd(dev) && (time_before(jiffies, oldtime + 10)));
 766         if (scb_rdcmd(dev)) {
 767                 printk("%s: command didn't clear\n", dev->name);
 768         }
 769 }
 770
 771 static irqreturn_t eexp_irq(int dummy, void *dev_info)
 772 {
 773         struct net_device *dev = dev_info;
 774         struct net_local *lp;
 775         unsigned short ioaddr,status,ack_cmd;
 776         unsigned short old_read_ptr, old_write_ptr;
 777
 778         lp = netdev_priv(dev);
 779         ioaddr = dev->base_addr;
 780
 781         spin_lock(&lp->lock);
 782
 783         old_read_ptr = inw(ioaddr+READ_PTR);
 784         old_write_ptr = inw(ioaddr+WRITE_PTR);
 785
 786         outb(SIRQ_dis|irqrmap[dev->irq], ioaddr+SET_IRQ);
 787
 788         status = scb_status(dev);
 789
 790 #if NET_DEBUG > 4
 791         printk(KERN_DEBUG "%s: interrupt (status %x)\n", dev->name, status);
 792 #endif
 793
 794         if (lp->started == (STARTED_CU | STARTED_RU)) {
 795
 796                 do {
 797                         eexp_cmd_clear(dev);
 798
 799                         ack_cmd = SCB_ack(status);
 800                         scb_command(dev, ack_cmd);
 801                         outb(0,ioaddr+SIGNAL_CA);
 802
 803                         eexp_cmd_clear(dev);
 804
 805                         if (SCB_complete(status)) {
 806                                 if (!eexp_hw_lasttxstat(dev)) {
 807                                         printk("%s: tx interrupt but no status\n", dev->name);
 808                                 }
 809                         }
 810
 811                         if (SCB_rxdframe(status))
 812                                 eexp_hw_rx_pio(dev);
 813
 814                         status = scb_status(dev);
 815                 } while (status & 0xc000);
 816
 817                 if (SCB_RUdead(status))
 818                 {
 819                         printk(KERN_WARNING "%s: RU stopped: status %04x\n",
 820                                dev->name,status);
 821 #if 0
 822                         printk(KERN_WARNING "%s: cur_rfd=%04x, cur_rbd=%04x\n", dev->name, lp->cur_rfd, lp->cur_rbd);
 823                         outw(lp->cur_rfd, ioaddr+READ_PTR);
 824                         printk(KERN_WARNING "%s: [%04x]\n", dev->name, inw(ioaddr+DATAPORT));
 825                         outw(lp->cur_rfd+6, ioaddr+READ_PTR);
 826                         printk(KERN_WARNING "%s: rbd is %04x\n", dev->name, rbd= inw(ioaddr+DATAPORT));
 827                         outw(rbd, ioaddr+READ_PTR);
 828                         printk(KERN_WARNING "%s: [%04x %04x] ", dev->name, inw(ioaddr+DATAPORT), inw(ioaddr+DATAPORT));
 829                         outw(rbd+8, ioaddr+READ_PTR);
 830                         printk("[%04x]\n", inw(ioaddr+DATAPORT));
 831 #endif
 832                         dev->stats.rx_errors++;
 833 #if 1
 834                         eexp_hw_rxinit(dev);
 835 #else
 836                         lp->cur_rfd = lp->first_rfd;
 837 #endif
 838                         scb_wrrfa(dev, lp->rx_buf_start);
 839                         scb_command(dev, SCB_RUstart);
 840                         outb(0,ioaddr+SIGNAL_CA);
 841                 }
 842         } else {
 843                 if (status & 0x8000)
 844                         ack_cmd = eexp_start_irq(dev, status);
 845                 else
 846                         ack_cmd = SCB_ack(status);
 847                 scb_command(dev, ack_cmd);
 848                 outb(0,ioaddr+SIGNAL_CA);
 849         }
 850
 851         eexp_cmd_clear(dev);
 852
 853         outb(SIRQ_en|irqrmap[dev->irq], ioaddr+SET_IRQ);
 854
 855 #if NET_DEBUG > 6
 856         printk("%s: leaving eexp_irq()\n", dev->name);
 857 #endif
 858         outw(old_read_ptr, ioaddr+READ_PTR);
 859         outw(old_write_ptr, ioaddr+WRITE_PTR);
 860
 861         spin_unlock(&lp->lock);
 862         return IRQ_HANDLED;
 863 }
 864
 865 /*
 866  * Hardware access functions
 867  */
 868
 869 /*
 870  * Set the cable type to use.
 871  */
 872
 873 static void eexp_hw_set_interface(struct net_device *dev)
 874 {
 875         unsigned char oldval = inb(dev->base_addr + 0x300e);
 876         oldval &= ~0x82;
 877         switch (dev->if_port) {
 878         case TPE:
 879                 oldval |= 0x2;
 880         case BNC:
 881                 oldval |= 0x80;
 882                 break;
 883         }
 884         outb(oldval, dev->base_addr+0x300e);
 885         mdelay(20);
 886 }
 887
 888 /*
 889  * Check all the receive buffers, and hand any received packets
 890  * to the upper levels. Basic sanity check on each frame
 891  * descriptor, though we don't bother trying to fix broken ones.
 892  */
 893
 894 static void eexp_hw_rx_pio(struct net_device *dev)
 895 {
 896         struct net_local *lp = netdev_priv(dev);
 897         unsigned short rx_block = lp->rx_ptr;
 898         unsigned short boguscount = lp->num_rx_bufs;
 899         unsigned short ioaddr = dev->base_addr;
 900         unsigned short status;
 901
 902 #if NET_DEBUG > 6
 903         printk(KERN_DEBUG "%s: eexp_hw_rx()\n", dev->name);
 904 #endif
 905
 906         do {
 907                 unsigned short rfd_cmd, rx_next, pbuf, pkt_len;
 908
 909                 outw(rx_block, ioaddr + READ_PTR);
 910                 status = inw(ioaddr + DATAPORT);
 911
 912                 if (FD_Done(status))
 913                 {
 914                         rfd_cmd = inw(ioaddr + DATAPORT);
 915                         rx_next = inw(ioaddr + DATAPORT);
 916                         pbuf = inw(ioaddr + DATAPORT);
 917
 918                         outw(pbuf, ioaddr + READ_PTR);
 919                         pkt_len = inw(ioaddr + DATAPORT);
 920
 921                         if (rfd_cmd!=0x0000)
 922                         {
 923                                 printk(KERN_WARNING "%s: rfd_cmd not zero:0x%04x\n",
 924                                        dev->name, rfd_cmd);
 925                                 continue;
 926                         }
 927                         else if (pbuf!=rx_block+0x16)
 928                         {
 929                                 printk(KERN_WARNING "%s: rfd and rbd out of sync 0x%04x 0x%04x\n",
 930                                        dev->name, rx_block+0x16, pbuf);
 931                                 continue;
 932                         }
 933                         else if ((pkt_len & 0xc000)!=0xc000)
 934                         {
 935                                 printk(KERN_WARNING "%s: EOF or F not set on received buffer (%04x)\n",
 936                                        dev->name, pkt_len & 0xc000);
 937                                 continue;
 938                         }
 939                         else if (!FD_OK(status))
 940                         {
 941                                 dev->stats.rx_errors++;
 942                                 if (FD_CRC(status))
 943                                         dev->stats.rx_crc_errors++;
 944                                 if (FD_Align(status))
 945                                         dev->stats.rx_frame_errors++;
 946                                 if (FD_Resrc(status))
 947                                         dev->stats.rx_fifo_errors++;
 948                                 if (FD_DMA(status))
 949                                         dev->stats.rx_over_errors++;
 950                                 if (FD_Short(status))
 951                                         dev->stats.rx_length_errors++;
 952                         }
 953                         else
 954                         {
 955                                 struct sk_buff *skb;
 956                                 pkt_len &= 0x3fff;
 957                                 skb = netdev_alloc_skb(dev, pkt_len + 16);
 958                                 if (skb == NULL)
 959                                 {
 960                                         printk(KERN_WARNING "%s: Memory squeeze, dropping packet\n",dev->name);
 961                                         dev->stats.rx_dropped++;
 962                                         break;
 963                                 }
 964                                 skb_reserve(skb, 2);
 965                                 outw(pbuf+10, ioaddr+READ_PTR);
 966                                 insw(ioaddr+DATAPORT, skb_put(skb,pkt_len),(pkt_len+1)>>1);
 967                                 skb->protocol = eth_type_trans(skb,dev);
 968                                 netif_rx(skb);
 969                                 dev->stats.rx_packets++;
 970                                 dev->stats.rx_bytes += pkt_len;
 971                         }
 972                         outw(rx_block, ioaddr+WRITE_PTR);
 973                         outw(0, ioaddr+DATAPORT);
 974                         outw(0, ioaddr+DATAPORT);
 975                         rx_block = rx_next;
 976                 }
 977         } while (FD_Done(status) && boguscount--);
 978         lp->rx_ptr = rx_block;
 979 }
 980
 981 /*
 982  * Hand a packet to the card for transmission
 983  * If we get here, we MUST have already checked
 984  * to make sure there is room in the transmit
 985  * buffer region.
 986  */
 987
 988 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
 989                        unsigned short len)
 990 {
 991         struct net_local *lp = netdev_priv(dev);
 992         unsigned short ioaddr = dev->base_addr;
 993
 994         if (LOCKUP16 || lp->width) {
 995                 /* Stop the CU so that there is no chance that it
 996                    jumps off to a bogus address while we are writing the
 997                    pointer to the next transmit packet in 8-bit mode --
 998                    this eliminates the "CU wedged" errors in 8-bit mode.
 999                    (Zoltan Szilagyi 10-12-96) */
1000                 scb_command(dev, SCB_CUsuspend);
1001                 outw(0xFFFF, ioaddr+SIGNAL_CA);
1002         }
1003
1004         outw(lp->tx_head, ioaddr + WRITE_PTR);
1005
1006         outw(0x0000, ioaddr + DATAPORT);
1007         outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1008         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
1009         outw(lp->tx_head+0x0e, ioaddr + DATAPORT);
1010
1011         outw(0x0000, ioaddr + DATAPORT);
1012         outw(0x0000, ioaddr + DATAPORT);
1013         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
1014
1015         outw(0x8000|len, ioaddr + DATAPORT);
1016         outw(-1, ioaddr + DATAPORT);
1017         outw(lp->tx_head+0x16, ioaddr + DATAPORT);
1018         outw(0, ioaddr + DATAPORT);
1019
1020         outsw(ioaddr + DATAPORT, buf, (len+1)>>1);
1021
1022         outw(lp->tx_tail+0xc, ioaddr + WRITE_PTR);
1023         outw(lp->tx_head, ioaddr + DATAPORT);
1024
1025         dev->trans_start = jiffies;
1026         lp->tx_tail = lp->tx_head;
1027         if (lp->tx_head==TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1028                 lp->tx_head = TX_BUF_START;
1029         else
1030                 lp->tx_head += TX_BUF_SIZE;
1031         if (lp->tx_head != lp->tx_reap)
1032                 netif_wake_queue(dev);
1033
1034         if (LOCKUP16 || lp->width) {
1035                 /* Restart the CU so that the packet can actually
1036                    be transmitted. (Zoltan Szilagyi 10-12-96) */
1037                 scb_command(dev, SCB_CUresume);
1038                 outw(0xFFFF, ioaddr+SIGNAL_CA);
1039         }
1040
1041         dev->stats.tx_packets++;
1042         lp->last_tx = jiffies;
1043 }
1044
1045 static const struct net_device_ops eexp_netdev_ops = {
1046         .ndo_open               = eexp_open,
1047         .ndo_stop               = eexp_close,
1048         .ndo_start_xmit         = eexp_xmit,
1049         .ndo_set_rx_mode        = eexp_set_multicast,
1050         .ndo_tx_timeout         = eexp_timeout,
1051         .ndo_change_mtu         = eth_change_mtu,
1052         .ndo_set_mac_address    = eth_mac_addr,
1053         .ndo_validate_addr      = eth_validate_addr,
1054 };
1055
1056 /*
1057  * Sanity check the suspected EtherExpress card
1058  * Read hardware address, reset card, size memory and initialize buffer
1059  * memory pointers. These are held in netdev_priv(), in case someone has more
1060  * than one card in a machine.
1061  */
1062
1063 static int __init eexp_hw_probe(struct net_device *dev, unsigned short ioaddr)
1064 {
1065         unsigned short hw_addr[3];
1066         unsigned char buswidth;
1067         unsigned int memory_size;
1068         int i;
1069         unsigned short xsum = 0;
1070         struct net_local *lp = netdev_priv(dev);
1071
1072         printk("%s: EtherExpress 16 at %#x ",dev->name,ioaddr);
1073
1074         outb(ASIC_RST, ioaddr+EEPROM_Ctrl);
1075         outb(0, ioaddr+EEPROM_Ctrl);
1076         udelay(500);
1077         outb(i586_RST, ioaddr+EEPROM_Ctrl);
1078
1079         hw_addr[0] = eexp_hw_readeeprom(ioaddr,2);
1080         hw_addr[1] = eexp_hw_readeeprom(ioaddr,3);
1081         hw_addr[2] = eexp_hw_readeeprom(ioaddr,4);
1082
1083         /* Standard Address or Compaq LTE Address */
1084         if (!((hw_addr[2]==0x00aa && ((hw_addr[1] & 0xff00)==0x0000)) ||
1085               (hw_addr[2]==0x0080 && ((hw_addr[1] & 0xff00)==0x5F00))))
1086         {
1087                 printk(" rejected: invalid address %04x%04x%04x\n",
1088                         hw_addr[2],hw_addr[1],hw_addr[0]);
1089                 return -ENODEV;
1090         }
1091
1092         /* Calculate the EEPROM checksum.  Carry on anyway if it's bad,
1093          * though.
1094          */
1095         for (i = 0; i < 64; i++)
1096                 xsum += eexp_hw_readeeprom(ioaddr, i);
1097         if (xsum != 0xbaba)
1098                 printk(" (bad EEPROM xsum 0x%02x)", xsum);
1099
1100         dev->base_addr = ioaddr;
1101         for ( i=0 ; i<6 ; i++ )
1102                 dev->dev_addr[i] = ((unsigned char *)hw_addr)[5-i];
1103
1104         {
1105                 static const char irqmap[] = { 0, 9, 3, 4, 5, 10, 11, 0 };
1106                 unsigned short setupval = eexp_hw_readeeprom(ioaddr,0);
1107
1108                 /* Use the IRQ from EEPROM if none was given */
1109                 if (!dev->irq)
1110                         dev->irq = irqmap[setupval>>13];
1111
1112                 if (dev->if_port == 0xff) {
1113                         dev->if_port = !(setupval & 0x1000) ? AUI :
1114                                 eexp_hw_readeeprom(ioaddr,5) & 0x1 ? TPE : BNC;
1115                 }
1116
1117                 buswidth = !((setupval & 0x400) >> 10);
1118         }
1119
1120         memset(lp, 0, sizeof(struct net_local));
1121         spin_lock_init(&lp->lock);
1122
1123         printk("(IRQ %d, %s connector, %d-bit bus", dev->irq,
1124                eexp_ifmap[dev->if_port], buswidth?8:16);
1125
1126         if (!request_region(dev->base_addr + 0x300e, 1, "EtherExpress"))
1127                 return -EBUSY;
1128
1129         eexp_hw_set_interface(dev);
1130
1131         release_region(dev->base_addr + 0x300e, 1);
1132
1133         /* Find out how much RAM we have on the card */
1134         outw(0, dev->base_addr + WRITE_PTR);
1135         for (i = 0; i < 32768; i++)
1136                 outw(0, dev->base_addr + DATAPORT);
1137
1138         for (memory_size = 0; memory_size < 64; memory_size++)
1139         {
1140                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1141                 if (inw(dev->base_addr+DATAPORT))
1142                         break;
1143                 outw(memory_size<<10, dev->base_addr + WRITE_PTR);
1144                 outw(memory_size | 0x5000, dev->base_addr+DATAPORT);
1145                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1146                 if (inw(dev->base_addr+DATAPORT) != (memory_size | 0x5000))
1147                         break;
1148         }
1149
1150         /* Sort out the number of buffers.  We may have 16, 32, 48 or 64k
1151          * of RAM to play with.
1152          */
1153         lp->num_tx_bufs = 4;
1154         lp->rx_buf_end = 0x3ff6;
1155         switch (memory_size)
1156         {
1157         case 64:
1158                 lp->rx_buf_end += 0x4000;
1159         case 48:
1160                 lp->num_tx_bufs += 4;
1161                 lp->rx_buf_end += 0x4000;
1162         case 32:
1163                 lp->rx_buf_end += 0x4000;
1164         case 16:
1165                 printk(", %dk RAM)\n", memory_size);
1166                 break;
1167         default:
1168                 printk(") bad memory size (%dk).\n", memory_size);
1169                 return -ENODEV;
1170                 break;
1171         }
1172
1173         lp->rx_buf_start = TX_BUF_START + (lp->num_tx_bufs*TX_BUF_SIZE);
1174         lp->width = buswidth;
1175
1176         dev->netdev_ops = &eexp_netdev_ops;
1177         dev->watchdog_timeo = 2*HZ;
1178
1179         return register_netdev(dev);
1180 }
1181
1182 /*
1183  * Read a word from the EtherExpress on-board serial EEPROM.
1184  * The EEPROM contains 64 words of 16 bits.
1185  */
1186 static unsigned short __init eexp_hw_readeeprom(unsigned short ioaddr,
1187                                                     unsigned char location)
1188 {
1189         unsigned short cmd = 0x180|(location&0x7f);
1190         unsigned short rval = 0,wval = EC_CS|i586_RST;
1191         int i;
1192
1193         outb(EC_CS|i586_RST,ioaddr+EEPROM_Ctrl);
1194         for (i=0x100 ; i ; i>>=1 )
1195         {
1196                 if (cmd&i)
1197                         wval |= EC_Wr;
1198                 else
1199                         wval &= ~EC_Wr;
1200
1201                 outb(wval,ioaddr+EEPROM_Ctrl);
1202                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1203                 eeprom_delay();
1204                 outb(wval,ioaddr+EEPROM_Ctrl);
1205                 eeprom_delay();
1206         }
1207         wval &= ~EC_Wr;
1208         outb(wval,ioaddr+EEPROM_Ctrl);
1209         for (i=0x8000 ; i ; i>>=1 )
1210         {
1211                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1212                 eeprom_delay();
1213                 if (inb(ioaddr+EEPROM_Ctrl)&EC_Rd)
1214                         rval |= i;
1215                 outb(wval,ioaddr+EEPROM_Ctrl);
1216                 eeprom_delay();
1217         }
1218         wval &= ~EC_CS;
1219         outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1220         eeprom_delay();
1221         outb(wval,ioaddr+EEPROM_Ctrl);
1222         eeprom_delay();
1223         return rval;
1224 }
1225
1226 /*
1227  * Reap tx buffers and return last transmit status.
1228  * if ==0 then either:
1229  *    a) we're not transmitting anything, so why are we here?
1230  *    b) we've died.
1231  * otherwise, Stat_Busy(return) means we've still got some packets
1232  * to transmit, Stat_Done(return) means our buffers should be empty
1233  * again
1234  */
1235
1236 static unsigned short eexp_hw_lasttxstat(struct net_device *dev)
1237 {
1238         struct net_local *lp = netdev_priv(dev);
1239         unsigned short tx_block = lp->tx_reap;
1240         unsigned short status;
1241
1242         if (!netif_queue_stopped(dev) && lp->tx_head==lp->tx_reap)
1243                 return 0x0000;
1244
1245         do
1246         {
1247                 outw(tx_block & ~31, dev->base_addr + SM_PTR);
1248                 status = inw(dev->base_addr + SHADOW(tx_block));
1249                 if (!Stat_Done(status))
1250                 {
1251                         lp->tx_link = tx_block;
1252                         return status;
1253                 }
1254                 else
1255                 {
1256                         lp->last_tx_restart = 0;
1257                         dev->stats.collisions += Stat_NoColl(status);
1258                         if (!Stat_OK(status))
1259                         {
1260                                 char *whatsup = NULL;
1261                                 dev->stats.tx_errors++;
1262                                 if (Stat_Abort(status))
1263                                         dev->stats.tx_aborted_errors++;
1264                                 if (Stat_TNoCar(status)) {
1265                                         whatsup = "aborted, no carrier";
1266                                         dev->stats.tx_carrier_errors++;
1267                                 }
1268                                 if (Stat_TNoCTS(status)) {
1269                                         whatsup = "aborted, lost CTS";
1270                                         dev->stats.tx_carrier_errors++;
1271                                 }
1272                                 if (Stat_TNoDMA(status)) {
1273                                         whatsup = "FIFO underran";
1274                                         dev->stats.tx_fifo_errors++;
1275                                 }
1276                                 if (Stat_TXColl(status)) {
1277                                         whatsup = "aborted, too many collisions";
1278                                         dev->stats.tx_aborted_errors++;
1279                                 }
1280                                 if (whatsup)
1281                                         printk(KERN_INFO "%s: transmit %s\n",
1282                                                dev->name, whatsup);
1283                         }
1284                         else
1285                                 dev->stats.tx_packets++;
1286                 }
1287                 if (tx_block == TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1288                         lp->tx_reap = tx_block = TX_BUF_START;
1289                 else
1290                         lp->tx_reap = tx_block += TX_BUF_SIZE;
1291                 netif_wake_queue(dev);
1292         }
1293         while (lp->tx_reap != lp->tx_head);
1294
1295         lp->tx_link = lp->tx_tail + 0x08;
1296
1297         return status;
1298 }
1299
1300 /*
1301  * This should never happen. It is called when some higher routine detects
1302  * that the CU has stopped, to try to restart it from the last packet we knew
1303  * we were working on, or the idle loop if we had finished for the time.
1304  */
1305
1306 static void eexp_hw_txrestart(struct net_device *dev)
1307 {
1308         struct net_local *lp = netdev_priv(dev);
1309         unsigned short ioaddr = dev->base_addr;
1310
1311         lp->last_tx_restart = lp->tx_link;
1312         scb_wrcbl(dev, lp->tx_link);
1313         scb_command(dev, SCB_CUstart);
1314         outb(0,ioaddr+SIGNAL_CA);
1315
1316         {
1317                 unsigned short boguscount=50,failcount=5;
1318                 while (!scb_status(dev))
1319                 {
1320                         if (!--boguscount)
1321                         {
1322                                 if (--failcount)
1323                                 {
1324                                         printk(KERN_WARNING "%s: CU start timed out, status %04x, cmd %04x\n", dev->name, scb_status(dev), scb_rdcmd(dev));
1325                                         scb_wrcbl(dev, lp->tx_link);
1326                                         scb_command(dev, SCB_CUstart);
1327                                         outb(0,ioaddr+SIGNAL_CA);
1328                                         boguscount = 100;
1329                                 }
1330                                 else
1331                                 {
1332                                         printk(KERN_WARNING "%s: Failed to restart CU, resetting board...\n",dev->name);
1333                                         eexp_hw_init586(dev);
1334                                         netif_wake_queue(dev);
1335                                         return;
1336                                 }
1337                         }
1338                 }
1339         }
1340 }
1341
1342 /*
1343  * Writes down the list of transmit buffers into card memory.  Each
1344  * entry consists of an 82586 transmit command, followed by a jump
1345  * pointing to itself.  When we want to transmit a packet, we write
1346  * the data into the appropriate transmit buffer and then modify the
1347  * preceding jump to point at the new transmit command.  This means that
1348  * the 586 command unit is continuously active.
1349  */
1350
1351 static void eexp_hw_txinit(struct net_device *dev)
1352 {
1353         struct net_local *lp = netdev_priv(dev);
1354         unsigned short tx_block = TX_BUF_START;
1355         unsigned short curtbuf;
1356         unsigned short ioaddr = dev->base_addr;
1357
1358         for ( curtbuf=0 ; curtbuf<lp->num_tx_bufs ; curtbuf++ )
1359         {
1360                 outw(tx_block, ioaddr + WRITE_PTR);
1361
1362                 outw(0x0000, ioaddr + DATAPORT);
1363                 outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1364                 outw(tx_block+0x08, ioaddr + DATAPORT);
1365                 outw(tx_block+0x0e, ioaddr + DATAPORT);
1366
1367                 outw(0x0000, ioaddr + DATAPORT);
1368                 outw(0x0000, ioaddr + DATAPORT);
1369                 outw(tx_block+0x08, ioaddr + DATAPORT);
1370
1371                 outw(0x8000, ioaddr + DATAPORT);
1372                 outw(-1, ioaddr + DATAPORT);
1373                 outw(tx_block+0x16, ioaddr + DATAPORT);
1374                 outw(0x0000, ioaddr + DATAPORT);
1375
1376                 tx_block += TX_BUF_SIZE;
1377         }
1378         lp->tx_head = TX_BUF_START;
1379         lp->tx_reap = TX_BUF_START;
1380         lp->tx_tail = tx_block - TX_BUF_SIZE;
1381         lp->tx_link = lp->tx_tail + 0x08;
1382         lp->rx_buf_start = tx_block;
1383
1384 }
1385
1386 /*
1387  * Write the circular list of receive buffer descriptors to card memory.
1388  * The end of the list isn't marked, which means that the 82586 receive
1389  * unit will loop until buffers become available (this avoids it giving us
1390  * "out of resources" messages).
1391  */
1392
1393 static void eexp_hw_rxinit(struct net_device *dev)
1394 {
1395         struct net_local *lp = netdev_priv(dev);
1396         unsigned short rx_block = lp->rx_buf_start;
1397         unsigned short ioaddr = dev->base_addr;
1398
1399         lp->num_rx_bufs = 0;
1400         lp->rx_first = lp->rx_ptr = rx_block;
1401         do
1402         {
1403                 lp->num_rx_bufs++;
1404
1405                 outw(rx_block, ioaddr + WRITE_PTR);
1406
1407                 outw(0, ioaddr + DATAPORT);  outw(0, ioaddr+DATAPORT);
1408                 outw(rx_block + RX_BUF_SIZE, ioaddr+DATAPORT);
1409                 outw(0xffff, ioaddr+DATAPORT);
1410
1411                 outw(0x0000, ioaddr+DATAPORT);
1412                 outw(0xdead, ioaddr+DATAPORT);
1413                 outw(0xdead, ioaddr+DATAPORT);
1414                 outw(0xdead, ioaddr+DATAPORT);
1415                 outw(0xdead, ioaddr+DATAPORT);
1416                 outw(0xdead, ioaddr+DATAPORT);
1417                 outw(0xdead, ioaddr+DATAPORT);
1418
1419                 outw(0x0000, ioaddr+DATAPORT);
1420                 outw(rx_block + RX_BUF_SIZE + 0x16, ioaddr+DATAPORT);
1421                 outw(rx_block + 0x20, ioaddr+DATAPORT);
1422                 outw(0, ioaddr+DATAPORT);
1423                 outw(RX_BUF_SIZE-0x20, ioaddr+DATAPORT);
1424
1425                 lp->rx_last = rx_block;
1426                 rx_block += RX_BUF_SIZE;
1427         } while (rx_block <= lp->rx_buf_end-RX_BUF_SIZE);
1428
1429
1430         /* Make first Rx frame descriptor point to first Rx buffer
1431            descriptor */
1432         outw(lp->rx_first + 6, ioaddr+WRITE_PTR);
1433         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1434
1435         /* Close Rx frame descriptor ring */
1436         outw(lp->rx_last + 4, ioaddr+WRITE_PTR);
1437         outw(lp->rx_first, ioaddr+DATAPORT);
1438
1439         /* Close Rx buffer descriptor ring */
1440         outw(lp->rx_last + 0x16 + 2, ioaddr+WRITE_PTR);
1441         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1442
1443 }
1444
1445 /*
1446  * Un-reset the 586, and start the configuration sequence. We don't wait for
1447  * this to finish, but allow the interrupt handler to start the CU and RU for
1448  * us.  We can't start the receive/transmission system up before we know that
1449  * the hardware is configured correctly.
1450  */
1451
1452 static void eexp_hw_init586(struct net_device *dev)
1453 {
1454         struct net_local *lp = netdev_priv(dev);
1455         unsigned short ioaddr = dev->base_addr;
1456         int i;
1457
1458 #if NET_DEBUG > 6
1459         printk("%s: eexp_hw_init586()\n", dev->name);
1460 #endif
1461
1462         lp->started = 0;
1463
1464         set_loopback(dev);
1465
1466         outb(SIRQ_dis|irqrmap[dev->irq],ioaddr+SET_IRQ);
1467
1468         /* Download the startup code */
1469         outw(lp->rx_buf_end & ~31, ioaddr + SM_PTR);
1470         outw(lp->width?0x0001:0x0000, ioaddr + 0x8006);
1471         outw(0x0000, ioaddr + 0x8008);
1472         outw(0x0000, ioaddr + 0x800a);
1473         outw(0x0000, ioaddr + 0x800c);
1474         outw(0x0000, ioaddr + 0x800e);
1475
1476         for (i = 0; i < ARRAY_SIZE(start_code) * 2; i+=32) {
1477                 int j;
1478                 outw(i, ioaddr + SM_PTR);
1479                 for (j = 0; j < 16 && (i+j)/2 < ARRAY_SIZE(start_code); j+=2)
1480                         outw(start_code[(i+j)/2],
1481                              ioaddr+0x4000+j);
1482                 for (j = 0; j < 16 && (i+j+16)/2 < ARRAY_SIZE(start_code); j+=2)
1483                         outw(start_code[(i+j+16)/2],
1484                              ioaddr+0x8000+j);
1485         }
1486
1487         /* Do we want promiscuous mode or multicast? */
1488         outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1489         i = inw(ioaddr+SHADOW(CONF_PROMISC));
1490         outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1491              ioaddr+SHADOW(CONF_PROMISC));
1492         lp->was_promisc = dev->flags & IFF_PROMISC;
1493 #if 0
1494         eexp_setup_filter(dev);
1495 #endif
1496
1497         /* Write our hardware address */
1498         outw(CONF_HWADDR & ~31, ioaddr+SM_PTR);
1499         outw(((unsigned short *)dev->dev_addr)[0], ioaddr+SHADOW(CONF_HWADDR));
1500         outw(((unsigned short *)dev->dev_addr)[1],
1501              ioaddr+SHADOW(CONF_HWADDR+2));
1502         outw(((unsigned short *)dev->dev_addr)[2],
1503              ioaddr+SHADOW(CONF_HWADDR+4));
1504
1505         eexp_hw_txinit(dev);
1506         eexp_hw_rxinit(dev);
1507
1508         outb(0,ioaddr+EEPROM_Ctrl);
1509         mdelay(5);
1510
1511         scb_command(dev, 0xf000);
1512         outb(0,ioaddr+SIGNAL_CA);
1513
1514         outw(0, ioaddr+SM_PTR);
1515
1516         {
1517                 unsigned short rboguscount=50,rfailcount=5;
1518                 while (inw(ioaddr+0x4000))
1519                 {
1520                         if (!--rboguscount)
1521                         {
1522                                 printk(KERN_WARNING "%s: i82586 reset timed out, kicking...\n",
1523                                         dev->name);
1524                                 scb_command(dev, 0);
1525                                 outb(0,ioaddr+SIGNAL_CA);
1526                                 rboguscount = 100;
1527                                 if (!--rfailcount)
1528                                 {
1529                                         printk(KERN_WARNING "%s: i82586 not responding, giving up.\n",
1530                                                 dev->name);
1531                                         return;
1532                                 }
1533                         }
1534                 }
1535         }
1536
1537         scb_wrcbl(dev, CONF_LINK);
1538         scb_command(dev, 0xf000|SCB_CUstart);
1539         outb(0,ioaddr+SIGNAL_CA);
1540
1541         {
1542                 unsigned short iboguscount=50,ifailcount=5;
1543                 while (!scb_status(dev))
1544                 {
1545                         if (!--iboguscount)
1546                         {
1547                                 if (--ifailcount)
1548                                 {
1549                                         printk(KERN_WARNING "%s: i82586 initialization timed out, status %04x, cmd %04x\n",
1550                                                 dev->name, scb_status(dev), scb_rdcmd(dev));
1551                                         scb_wrcbl(dev, CONF_LINK);
1552                                         scb_command(dev, 0xf000|SCB_CUstart);
1553                                         outb(0,ioaddr+SIGNAL_CA);
1554                                         iboguscount = 100;
1555                                 }
1556                                 else
1557                                 {
1558                                         printk(KERN_WARNING "%s: Failed to initialize i82586, giving up.\n",dev->name);
1559                                         return;
1560                                 }
1561                         }
1562                 }
1563         }
1564
1565         clear_loopback(dev);
1566         outb(SIRQ_en|irqrmap[dev->irq],ioaddr+SET_IRQ);
1567
1568         lp->init_time = jiffies;
1569 #if NET_DEBUG > 6
1570         printk("%s: leaving eexp_hw_init586()\n", dev->name);
1571 #endif
1572 }
1573
1574 static void eexp_setup_filter(struct net_device *dev)
1575 {
1576         struct netdev_hw_addr *ha;
1577         unsigned short ioaddr = dev->base_addr;
1578         int count = netdev_mc_count(dev);
1579         int i;
1580         if (count > 8) {
1581                 printk(KERN_INFO "%s: too many multicast addresses (%d)\n",
1582                        dev->name, count);
1583                 count = 8;
1584         }
1585
1586         outw(CONF_NR_MULTICAST & ~31, ioaddr+SM_PTR);
1587         outw(6*count, ioaddr+SHADOW(CONF_NR_MULTICAST));
1588         i = 0;
1589         netdev_for_each_mc_addr(ha, dev) {
1590                 unsigned short *data = (unsigned short *) ha->addr;
1591
1592                 if (i == count)
1593                         break;
1594                 outw((CONF_MULTICAST+(6*i)) & ~31, ioaddr+SM_PTR);
1595                 outw(data[0], ioaddr+SHADOW(CONF_MULTICAST+(6*i)));
1596                 outw((CONF_MULTICAST+(6*i)+2) & ~31, ioaddr+SM_PTR);
1597                 outw(data[1], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+2));
1598                 outw((CONF_MULTICAST+(6*i)+4) & ~31, ioaddr+SM_PTR);
1599                 outw(data[2], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+4));
1600                 i++;
1601         }
1602 }
1603
1604 /*
1605  * Set or clear the multicast filter for this adaptor.
1606  */
1607 static void
1608 eexp_set_multicast(struct net_device *dev)
1609 {
1610         unsigned short ioaddr = dev->base_addr;
1611         struct net_local *lp = netdev_priv(dev);
1612         int kick = 0, i;
1613         if ((dev->flags & IFF_PROMISC) != lp->was_promisc) {
1614                 outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1615                 i = inw(ioaddr+SHADOW(CONF_PROMISC));
1616                 outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1617                      ioaddr+SHADOW(CONF_PROMISC));
1618                 lp->was_promisc = dev->flags & IFF_PROMISC;
1619                 kick = 1;
1620         }
1621         if (!(dev->flags & IFF_PROMISC)) {
1622                 eexp_setup_filter(dev);
1623                 if (lp->old_mc_count != netdev_mc_count(dev)) {
1624                         kick = 1;
1625                         lp->old_mc_count = netdev_mc_count(dev);
1626                 }
1627         }
1628         if (kick) {
1629                 unsigned long oj;
1630                 scb_command(dev, SCB_CUsuspend);
1631                 outb(0, ioaddr+SIGNAL_CA);
1632                 outb(0, ioaddr+SIGNAL_CA);
1633 #if 0
1634                 printk("%s: waiting for CU to go suspended\n", dev->name);
1635 #endif
1636                 oj = jiffies;
1637                 while ((SCB_CUstat(scb_status(dev)) == 2) &&
1638                        (time_before(jiffies, oj + 2000)));
1639                 if (SCB_CUstat(scb_status(dev)) == 2)
1640                         printk("%s: warning, CU didn't stop\n", dev->name);
1641                 lp->started &= ~(STARTED_CU);
1642                 scb_wrcbl(dev, CONF_LINK);
1643                 scb_command(dev, SCB_CUstart);
1644                 outb(0, ioaddr+SIGNAL_CA);
1645         }
1646 }
1647
1648
1649 /*
1650  * MODULE stuff
1651  */
1652
1653 #ifdef MODULE
1654
1655 #define EEXP_MAX_CARDS     4    /* max number of cards to support */
1656
1657 static struct net_device *dev_eexp[EEXP_MAX_CARDS];
1658 static int irq[EEXP_MAX_CARDS];
1659 static int io[EEXP_MAX_CARDS];
1660
1661 module_param_array(io, int, NULL, 0);
1662 module_param_array(irq, int, NULL, 0);
1663 MODULE_PARM_DESC(io, "EtherExpress 16 I/O base address(es)");
1664 MODULE_PARM_DESC(irq, "EtherExpress 16 IRQ number(s)");
1665 MODULE_LICENSE("GPL");
1666
1667
1668 /* Ideally the user would give us io=, irq= for every card.  If any parameters
1669  * are specified, we verify and then use them.  If no parameters are given, we
1670  * autoprobe for one card only.
1671  */
1672 int __init init_module(void)
1673 {
1674         struct net_device *dev;
1675         int this_dev, found = 0;
1676
1677         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1678                 dev = alloc_etherdev(sizeof(struct net_local));
1679                 dev->irq = irq[this_dev];
1680                 dev->base_addr = io[this_dev];
1681                 if (io[this_dev] == 0) {
1682                         if (this_dev)
1683                                 break;
1684                         printk(KERN_NOTICE "eexpress.c: Module autoprobe not recommended, give io=xx.\n");
1685                 }
1686                 if (do_express_probe(dev) == 0) {
1687                         dev_eexp[this_dev] = dev;
1688                         found++;
1689                         continue;
1690                 }
1691                 printk(KERN_WARNING "eexpress.c: Failed to register card at 0x%x.\n", io[this_dev]);
1692                 free_netdev(dev);
1693                 break;
1694         }
1695         if (found)
1696                 return 0;
1697         return -ENXIO;
1698 }
1699
1700 void __exit cleanup_module(void)
1701 {
1702         int this_dev;
1703
1704         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1705                 struct net_device *dev = dev_eexp[this_dev];
1706                 if (dev) {
1707                         unregister_netdev(dev);
1708                         free_netdev(dev);
1709                 }
1710         }
1711 }
1712 #endif
1713
1714 /*
1715  * Local Variables:
1716  *  c-file-style: "linux"
1717  *  tab-width: 8
1718  * End:
1719  */