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   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/slab.h>
 115 #include <linux/mca-legacy.h>
 116 #include <linux/spinlock.h>
 117 #include <linux/bitops.h>
 118 #include <linux/jiffies.h>
 119
 120 #include <asm/system.h>
 121 #include <asm/io.h>
 122 #include <asm/irq.h>
 123
 124 #ifndef NET_DEBUG
 125 #define NET_DEBUG 4
 126 #endif
 127
 128 #include "eexpress.h"
 129
 130 #define EEXP_IO_EXTENT  16
 131
 132 /*
 133  * Private data declarations
 134  */
 135
 136 struct net_local
 137 {
 138         unsigned long last_tx;       /* jiffies when last transmit started */
 139         unsigned long init_time;     /* jiffies when eexp_hw_init586 called */
 140         unsigned short rx_first;     /* first rx buf, same as RX_BUF_START */
 141         unsigned short rx_last;      /* last rx buf */
 142         unsigned short rx_ptr;       /* first rx buf to look at */
 143         unsigned short tx_head;      /* next free tx buf */
 144         unsigned short tx_reap;      /* first in-use tx buf */
 145         unsigned short tx_tail;      /* previous tx buf to tx_head */
 146         unsigned short tx_link;      /* last known-executing tx buf */
 147         unsigned short last_tx_restart;   /* set to tx_link when we
 148                                              restart the CU */
 149         unsigned char started;
 150         unsigned short rx_buf_start;
 151         unsigned short rx_buf_end;
 152         unsigned short num_tx_bufs;
 153         unsigned short num_rx_bufs;
 154         unsigned char width;         /* 0 for 16bit, 1 for 8bit */
 155         unsigned char was_promisc;
 156         unsigned char old_mc_count;
 157         spinlock_t lock;
 158 };
 159
 160 /* This is the code and data that is downloaded to the EtherExpress card's
 161  * memory at boot time.
 162  */
 163
 164 static unsigned short start_code[] = {
 165 /* 0x0000 */
 166         0x0001,                 /* ISCP: busy - cleared after reset */
 167         0x0008,0x0000,0x0000,   /* offset,address (lo,hi) of SCB */
 168
 169         0x0000,0x0000,          /* SCB: status, commands */
 170         0x0000,0x0000,          /* links to first command block,
 171                                    first receive descriptor */
 172         0x0000,0x0000,          /* CRC error, alignment error counts */
 173         0x0000,0x0000,          /* out of resources, overrun error counts */
 174
 175         0x0000,0x0000,          /* pad */
 176         0x0000,0x0000,
 177
 178 /* 0x20 -- start of 82586 CU program */
 179 #define CONF_LINK 0x20
 180         0x0000,Cmd_Config,
 181         0x0032,                 /* link to next command */
 182         0x080c,                 /* 12 bytes follow : fifo threshold=8 */
 183         0x2e40,                 /* don't rx bad frames
 184                                  * SRDY/ARDY => ext. sync. : preamble len=8
 185                                  * take addresses from data buffers
 186                                  * 6 bytes/address
 187                                  */
 188         0x6000,                 /* default backoff method & priority
 189                                  * interframe spacing = 0x60 */
 190         0xf200,                 /* slot time=0x200
 191                                  * max collision retry = 0xf */
 192 #define CONF_PROMISC  0x2e
 193         0x0000,                 /* no HDLC : normal CRC : enable broadcast
 194                                  * disable promiscuous/multicast modes */
 195         0x003c,                 /* minimum frame length = 60 octets) */
 196
 197         0x0000,Cmd_SetAddr,
 198         0x003e,                 /* link to next command */
 199 #define CONF_HWADDR  0x38
 200         0x0000,0x0000,0x0000,   /* hardware address placed here */
 201
 202         0x0000,Cmd_MCast,
 203         0x0076,                 /* link to next command */
 204 #define CONF_NR_MULTICAST 0x44
 205         0x0000,                 /* number of bytes in multicast address(es) */
 206 #define CONF_MULTICAST 0x46
 207         0x0000, 0x0000, 0x0000, /* some addresses */
 208         0x0000, 0x0000, 0x0000,
 209         0x0000, 0x0000, 0x0000,
 210         0x0000, 0x0000, 0x0000,
 211         0x0000, 0x0000, 0x0000,
 212         0x0000, 0x0000, 0x0000,
 213         0x0000, 0x0000, 0x0000,
 214         0x0000, 0x0000, 0x0000,
 215
 216 #define CONF_DIAG_RESULT  0x76
 217         0x0000, Cmd_Diag,
 218         0x007c,                 /* link to next command */
 219
 220         0x0000,Cmd_TDR|Cmd_INT,
 221         0x0084,
 222 #define CONF_TDR_RESULT  0x82
 223         0x0000,
 224
 225         0x0000,Cmd_END|Cmd_Nop, /* end of configure sequence */
 226         0x0084                  /* dummy link */
 227 };
 228
 229 /* maps irq number to EtherExpress magic value */
 230 static char irqrmap[] = { 0,0,1,2,3,4,0,0,0,1,5,6,0,0,0,0 };
 231
 232 #ifdef CONFIG_MCA_LEGACY
 233 /* mapping of the first four bits of the second POS register */
 234 static unsigned short mca_iomap[] = {
 235         0x270, 0x260, 0x250, 0x240, 0x230, 0x220, 0x210, 0x200,
 236         0x370, 0x360, 0x350, 0x340, 0x330, 0x320, 0x310, 0x300
 237 };
 238 /* bits 5-7 of the second POS register */
 239 static char mca_irqmap[] = { 12, 9, 3, 4, 5, 10, 11, 15 };
 240 #endif
 241
 242 /*
 243  * Prototypes for Linux interface
 244  */
 245
 246 static int eexp_open(struct net_device *dev);
 247 static int eexp_close(struct net_device *dev);
 248 static void eexp_timeout(struct net_device *dev);
 249 static int eexp_xmit(struct sk_buff *buf, struct net_device *dev);
 250
 251 static irqreturn_t eexp_irq(int irq, void *dev_addr);
 252 static void eexp_set_multicast(struct net_device *dev);
 253
 254 /*
 255  * Prototypes for hardware access functions
 256  */
 257
 258 static void eexp_hw_rx_pio(struct net_device *dev);
 259 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
 260                        unsigned short len);
 261 static int eexp_hw_probe(struct net_device *dev,unsigned short ioaddr);
 262 static unsigned short eexp_hw_readeeprom(unsigned short ioaddr,
 263                                          unsigned char location);
 264
 265 static unsigned short eexp_hw_lasttxstat(struct net_device *dev);
 266 static void eexp_hw_txrestart(struct net_device *dev);
 267
 268 static void eexp_hw_txinit    (struct net_device *dev);
 269 static void eexp_hw_rxinit    (struct net_device *dev);
 270
 271 static void eexp_hw_init586   (struct net_device *dev);
 272 static void eexp_setup_filter (struct net_device *dev);
 273
 274 static char *eexp_ifmap[]={"AUI", "BNC", "RJ45"};
 275 enum eexp_iftype {AUI=0, BNC=1, TPE=2};
 276
 277 #define STARTED_RU      2
 278 #define STARTED_CU      1
 279
 280 /*
 281  * Primitive hardware access functions.
 282  */
 283
 284 static inline unsigned short scb_status(struct net_device *dev)
 285 {
 286         return inw(dev->base_addr + 0xc008);
 287 }
 288
 289 static inline unsigned short scb_rdcmd(struct net_device *dev)
 290 {
 291         return inw(dev->base_addr + 0xc00a);
 292 }
 293
 294 static inline void scb_command(struct net_device *dev, unsigned short cmd)
 295 {
 296         outw(cmd, dev->base_addr + 0xc00a);
 297 }
 298
 299 static inline void scb_wrcbl(struct net_device *dev, unsigned short val)
 300 {
 301         outw(val, dev->base_addr + 0xc00c);
 302 }
 303
 304 static inline void scb_wrrfa(struct net_device *dev, unsigned short val)
 305 {
 306         outw(val, dev->base_addr + 0xc00e);
 307 }
 308
 309 static inline void set_loopback(struct net_device *dev)
 310 {
 311         outb(inb(dev->base_addr + Config) | 2, dev->base_addr + Config);
 312 }
 313
 314 static inline void clear_loopback(struct net_device *dev)
 315 {
 316         outb(inb(dev->base_addr + Config) & ~2, dev->base_addr + Config);
 317 }
 318
 319 static inline unsigned short int SHADOW(short int addr)
 320 {
 321         addr &= 0x1f;
 322         if (addr > 0xf) addr += 0x3ff0;
 323         return addr + 0x4000;
 324 }
 325
 326 /*
 327  * Linux interface
 328  */
 329
 330 /*
 331  * checks for presence of EtherExpress card
 332  */
 333
 334 static int __init do_express_probe(struct net_device *dev)
 335 {
 336         unsigned short *port;
 337         static unsigned short ports[] = { 0x240,0x300,0x310,0x270,0x320,0x340,0 };
 338         unsigned short ioaddr = dev->base_addr;
 339         int dev_irq = dev->irq;
 340         int err;
 341
 342         dev->if_port = 0xff; /* not set */
 343
 344 #ifdef CONFIG_MCA_LEGACY
 345         if (MCA_bus) {
 346                 int slot = 0;
 347
 348                 /*
 349                  * Only find one card at a time.  Subsequent calls
 350                  * will find others, however, proper multicard MCA
 351                  * probing and setup can't be done with the
 352                  * old-style Space.c init routines.  -- ASF
 353                  */
 354                 while (slot != MCA_NOTFOUND) {
 355                         int pos0, pos1;
 356
 357                         slot = mca_find_unused_adapter(0x628B, slot);
 358                         if (slot == MCA_NOTFOUND)
 359                                 break;
 360
 361                         pos0 = mca_read_stored_pos(slot, 2);
 362                         pos1 = mca_read_stored_pos(slot, 3);
 363                         ioaddr = mca_iomap[pos1&0xf];
 364
 365                         dev->irq = mca_irqmap[(pos1>>4)&0x7];
 366
 367                         /*
 368                          * XXX: Transciever selection is done
 369                          * differently on the MCA version.
 370                          * How to get it to select something
 371                          * other than external/AUI is currently
 372                          * unknown.  This code is just for looks. -- ASF
 373                          */
 374                         if ((pos0 & 0x7) == 0x1)
 375                                 dev->if_port = AUI;
 376                         else if ((pos0 & 0x7) == 0x5) {
 377                                 if (pos1 & 0x80)
 378                                         dev->if_port = BNC;
 379                                 else
 380                                         dev->if_port = TPE;
 381                         }
 382
 383                         mca_set_adapter_name(slot, "Intel EtherExpress 16 MCA");
 384                         mca_set_adapter_procfn(slot, NULL, dev);
 385                         mca_mark_as_used(slot);
 386
 387                         break;
 388                 }
 389         }
 390 #endif
 391         if (ioaddr&0xfe00) {
 392                 if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress"))
 393                         return -EBUSY;
 394                 err = eexp_hw_probe(dev,ioaddr);
 395                 release_region(ioaddr, EEXP_IO_EXTENT);
 396                 return err;
 397         } else if (ioaddr)
 398                 return -ENXIO;
 399
 400         for (port=&ports[0] ; *port ; port++ )
 401         {
 402                 unsigned short sum = 0;
 403                 int i;
 404                 if (!request_region(*port, EEXP_IO_EXTENT, "EtherExpress"))
 405                         continue;
 406                 for ( i=0 ; i<4 ; i++ )
 407                 {
 408                         unsigned short t;
 409                         t = inb(*port + ID_PORT);
 410                         sum |= (t>>4) << ((t & 0x03)<<2);
 411                 }
 412                 if (sum==0xbaba && !eexp_hw_probe(dev,*port)) {
 413                         release_region(*port, EEXP_IO_EXTENT);
 414                         return 0;
 415                 }
 416                 release_region(*port, EEXP_IO_EXTENT);
 417                 dev->irq = dev_irq;
 418         }
 419         return -ENODEV;
 420 }
 421
 422 #ifndef MODULE
 423 struct net_device * __init express_probe(int unit)
 424 {
 425         struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
 426         int err;
 427
 428         if (!dev)
 429                 return ERR_PTR(-ENOMEM);
 430
 431         sprintf(dev->name, "eth%d", unit);
 432         netdev_boot_setup_check(dev);
 433
 434         err = do_express_probe(dev);
 435         if (!err)
 436                 return dev;
 437         free_netdev(dev);
 438         return ERR_PTR(err);
 439 }
 440 #endif
 441
 442 /*
 443  * open and initialize the adapter, ready for use
 444  */
 445
 446 static int eexp_open(struct net_device *dev)
 447 {
 448         int ret;
 449         unsigned short ioaddr = dev->base_addr;
 450         struct net_local *lp = netdev_priv(dev);
 451
 452 #if NET_DEBUG > 6
 453         printk(KERN_DEBUG "%s: eexp_open()\n", dev->name);
 454 #endif
 455
 456         if (!dev->irq || !irqrmap[dev->irq])
 457                 return -ENXIO;
 458
 459         ret = request_irq(dev->irq, &eexp_irq, 0, dev->name, dev);
 460         if (ret)
 461                 return ret;
 462
 463         if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress")) {
 464                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 465                         , ioaddr);
 466                 goto err_out1;
 467         }
 468         if (!request_region(ioaddr+0x4000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 469                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 470                         , ioaddr+0x4000);
 471                 goto err_out2;
 472         }
 473         if (!request_region(ioaddr+0x8000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 474                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 475                         , ioaddr+0x8000);
 476                 goto err_out3;
 477         }
 478         if (!request_region(ioaddr+0xc000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 479                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 480                         , ioaddr+0xc000);
 481                 goto err_out4;
 482         }
 483
 484         if (lp->width) {
 485                 printk("%s: forcing ASIC to 8-bit mode\n", dev->name);
 486                 outb(inb(dev->base_addr+Config)&~4, dev->base_addr+Config);
 487         }
 488
 489         eexp_hw_init586(dev);
 490         netif_start_queue(dev);
 491 #if NET_DEBUG > 6
 492         printk(KERN_DEBUG "%s: leaving eexp_open()\n", dev->name);
 493 #endif
 494         return 0;
 495
 496         err_out4:
 497                 release_region(ioaddr+0x8000, EEXP_IO_EXTENT);
 498         err_out3:
 499                 release_region(ioaddr+0x4000, EEXP_IO_EXTENT);
 500         err_out2:
 501                 release_region(ioaddr, EEXP_IO_EXTENT);
 502         err_out1:
 503                 free_irq(dev->irq, dev);
 504                 return -EBUSY;
 505 }
 506
 507 /*
 508  * close and disable the interface, leaving the 586 in reset.
 509  */
 510
 511 static int eexp_close(struct net_device *dev)
 512 {
 513         unsigned short ioaddr = dev->base_addr;
 514         struct net_local *lp = netdev_priv(dev);
 515
 516         int irq = dev->irq;
 517
 518         netif_stop_queue(dev);
 519
 520         outb(SIRQ_dis|irqrmap[irq],ioaddr+SET_IRQ);
 521         lp->started = 0;
 522         scb_command(dev, SCB_CUsuspend|SCB_RUsuspend);
 523         outb(0,ioaddr+SIGNAL_CA);
 524         free_irq(irq,dev);
 525         outb(i586_RST,ioaddr+EEPROM_Ctrl);
 526         release_region(ioaddr, EEXP_IO_EXTENT);
 527         release_region(ioaddr+0x4000, 16);
 528         release_region(ioaddr+0x8000, 16);
 529         release_region(ioaddr+0xc000, 16);
 530
 531         return 0;
 532 }
 533
 534 /*
 535  * This gets called when a higher level thinks we are broken.  Check that
 536  * nothing has become jammed in the CU.
 537  */
 538
 539 static void unstick_cu(struct net_device *dev)
 540 {
 541         struct net_local *lp = netdev_priv(dev);
 542         unsigned short ioaddr = dev->base_addr;
 543
 544         if (lp->started)
 545         {
 546                 if (time_after(jiffies, dev->trans_start + 50))
 547                 {
 548                         if (lp->tx_link==lp->last_tx_restart)
 549                         {
 550                                 unsigned short boguscount=200,rsst;
 551                                 printk(KERN_WARNING "%s: Retransmit timed out, status %04x, resetting...\n",
 552                                        dev->name, scb_status(dev));
 553                                 eexp_hw_txinit(dev);
 554                                 lp->last_tx_restart = 0;
 555                                 scb_wrcbl(dev, lp->tx_link);
 556                                 scb_command(dev, SCB_CUstart);
 557                                 outb(0,ioaddr+SIGNAL_CA);
 558                                 while (!SCB_complete(rsst=scb_status(dev)))
 559                                 {
 560                                         if (!--boguscount)
 561                                         {
 562                                                 boguscount=200;
 563                                                 printk(KERN_WARNING "%s: Reset timed out status %04x, retrying...\n",
 564                                                        dev->name,rsst);
 565                                                 scb_wrcbl(dev, lp->tx_link);
 566                                                 scb_command(dev, SCB_CUstart);
 567                                                 outb(0,ioaddr+SIGNAL_CA);
 568                                         }
 569                                 }
 570                                 netif_wake_queue(dev);
 571                         }
 572                         else
 573                         {
 574                                 unsigned short status = scb_status(dev);
 575                                 if (SCB_CUdead(status))
 576                                 {
 577                                         unsigned short txstatus = eexp_hw_lasttxstat(dev);
 578                                         printk(KERN_WARNING "%s: Transmit timed out, CU not active status %04x %04x, restarting...\n",
 579                                                dev->name, status, txstatus);
 580                                         eexp_hw_txrestart(dev);
 581                                 }
 582                                 else
 583                                 {
 584                                         unsigned short txstatus = eexp_hw_lasttxstat(dev);
 585                                         if (netif_queue_stopped(dev) && !txstatus)
 586                                         {
 587                                                 printk(KERN_WARNING "%s: CU wedged, status %04x %04x, resetting...\n",
 588                                                        dev->name,status,txstatus);
 589                                                 eexp_hw_init586(dev);
 590                                                 netif_wake_queue(dev);
 591                                         }
 592                                         else
 593                                         {
 594                                                 printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
 595                                         }
 596                                 }
 597                         }
 598                 }
 599         }
 600         else
 601         {
 602                 if (time_after(jiffies, lp->init_time + 10))
 603                 {
 604                         unsigned short status = scb_status(dev);
 605                         printk(KERN_WARNING "%s: i82586 startup timed out, status %04x, resetting...\n",
 606                                dev->name, status);
 607                         eexp_hw_init586(dev);
 608                         netif_wake_queue(dev);
 609                 }
 610         }
 611 }
 612
 613 static void eexp_timeout(struct net_device *dev)
 614 {
 615         struct net_local *lp = netdev_priv(dev);
 616 #ifdef CONFIG_SMP
 617         unsigned long flags;
 618 #endif
 619         int status;
 620
 621         disable_irq(dev->irq);
 622
 623         /*
 624          *      Best would be to use synchronize_irq(); spin_lock() here
 625          *      lets make it work first..
 626          */
 627
 628 #ifdef CONFIG_SMP
 629         spin_lock_irqsave(&lp->lock, flags);
 630 #endif
 631
 632         status = scb_status(dev);
 633         unstick_cu(dev);
 634         printk(KERN_INFO "%s: transmit timed out, %s?\n", dev->name,
 635                (SCB_complete(status)?"lost interrupt":
 636                 "board on fire"));
 637         dev->stats.tx_errors++;
 638         lp->last_tx = jiffies;
 639         if (!SCB_complete(status)) {
 640                 scb_command(dev, SCB_CUabort);
 641                 outb(0,dev->base_addr+SIGNAL_CA);
 642         }
 643         netif_wake_queue(dev);
 644 #ifdef CONFIG_SMP
 645         spin_unlock_irqrestore(&lp->lock, flags);
 646 #endif
 647 }
 648
 649 /*
 650  * Called to transmit a packet, or to allow us to right ourselves
 651  * if the kernel thinks we've died.
 652  */
 653 static int eexp_xmit(struct sk_buff *buf, struct net_device *dev)
 654 {
 655         short length = buf->len;
 656 #ifdef CONFIG_SMP
 657         struct net_local *lp = netdev_priv(dev);
 658         unsigned long flags;
 659 #endif
 660
 661 #if NET_DEBUG > 6
 662         printk(KERN_DEBUG "%s: eexp_xmit()\n", dev->name);
 663 #endif
 664
 665         if (buf->len < ETH_ZLEN) {
 666                 if (skb_padto(buf, ETH_ZLEN))
 667                         return 0;
 668                 length = ETH_ZLEN;
 669         }
 670
 671         disable_irq(dev->irq);
 672
 673         /*
 674          *      Best would be to use synchronize_irq(); spin_lock() here
 675          *      lets make it work first..
 676          */
 677
 678 #ifdef CONFIG_SMP
 679         spin_lock_irqsave(&lp->lock, flags);
 680 #endif
 681
 682         {
 683                 unsigned short *data = (unsigned short *)buf->data;
 684
 685                 dev->stats.tx_bytes += length;
 686
 687                 eexp_hw_tx_pio(dev,data,length);
 688         }
 689         dev_kfree_skb(buf);
 690 #ifdef CONFIG_SMP
 691         spin_unlock_irqrestore(&lp->lock, flags);
 692 #endif
 693         enable_irq(dev->irq);
 694         return 0;
 695 }
 696
 697 /*
 698  * Handle an EtherExpress interrupt
 699  * If we've finished initializing, start the RU and CU up.
 700  * If we've already started, reap tx buffers, handle any received packets,
 701  * check to make sure we've not become wedged.
 702  */
 703
 704 static unsigned short eexp_start_irq(struct net_device *dev,
 705                                      unsigned short status)
 706 {
 707         unsigned short ack_cmd = SCB_ack(status);
 708         struct net_local *lp = netdev_priv(dev);
 709         unsigned short ioaddr = dev->base_addr;
 710         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_CU)) {
 711                 short diag_status, tdr_status;
 712                 while (SCB_CUstat(status)==2)
 713                         status = scb_status(dev);
 714 #if NET_DEBUG > 4
 715                 printk("%s: CU went non-active (status %04x)\n",
 716                        dev->name, status);
 717 #endif
 718
 719                 outw(CONF_DIAG_RESULT & ~31, ioaddr + SM_PTR);
 720                 diag_status = inw(ioaddr + SHADOW(CONF_DIAG_RESULT));
 721                 if (diag_status & 1<<11) {
 722                         printk(KERN_WARNING "%s: 82586 failed self-test\n",
 723                                dev->name);
 724                 } else if (!(diag_status & 1<<13)) {
 725                         printk(KERN_WARNING "%s: 82586 self-test failed to complete\n", dev->name);
 726                 }
 727
 728                 outw(CONF_TDR_RESULT & ~31, ioaddr + SM_PTR);
 729                 tdr_status = inw(ioaddr + SHADOW(CONF_TDR_RESULT));
 730                 if (tdr_status & (TDR_SHORT|TDR_OPEN)) {
 731                         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" : "");
 732                 }
 733                 else if (tdr_status & TDR_XCVRPROBLEM) {
 734                         printk(KERN_WARNING "%s: TDR reports transceiver problem\n", dev->name);
 735                 }
 736                 else if (tdr_status & TDR_LINKOK) {
 737 #if NET_DEBUG > 4
 738                         printk(KERN_DEBUG "%s: TDR reports link OK\n", dev->name);
 739 #endif
 740                 } else {
 741                         printk("%s: TDR is ga-ga (status %04x)\n", dev->name,
 742                                tdr_status);
 743                 }
 744
 745                 lp->started |= STARTED_CU;
 746                 scb_wrcbl(dev, lp->tx_link);
 747                 /* if the RU isn't running, start it now */
 748                 if (!(lp->started & STARTED_RU)) {
 749                         ack_cmd |= SCB_RUstart;
 750                         scb_wrrfa(dev, lp->rx_buf_start);
 751                         lp->rx_ptr = lp->rx_buf_start;
 752                         lp->started |= STARTED_RU;
 753                 }
 754                 ack_cmd |= SCB_CUstart | 0x2000;
 755         }
 756
 757         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_RU) && SCB_RUstat(status)==4)
 758                 lp->started|=STARTED_RU;
 759
 760         return ack_cmd;
 761 }
 762
 763 static void eexp_cmd_clear(struct net_device *dev)
 764 {
 765         unsigned long int oldtime = jiffies;
 766         while (scb_rdcmd(dev) && (time_before(jiffies, oldtime + 10)));
 767         if (scb_rdcmd(dev)) {
 768                 printk("%s: command didn't clear\n", dev->name);
 769         }
 770 }
 771
 772 static irqreturn_t eexp_irq(int dummy, void *dev_info)
 773 {
 774         struct net_device *dev = dev_info;
 775         struct net_local *lp;
 776         unsigned short ioaddr,status,ack_cmd;
 777         unsigned short old_read_ptr, old_write_ptr;
 778
 779         lp = netdev_priv(dev);
 780         ioaddr = dev->base_addr;
 781
 782         spin_lock(&lp->lock);
 783
 784         old_read_ptr = inw(ioaddr+READ_PTR);
 785         old_write_ptr = inw(ioaddr+WRITE_PTR);
 786
 787         outb(SIRQ_dis|irqrmap[dev->irq], ioaddr+SET_IRQ);
 788
 789         status = scb_status(dev);
 790
 791 #if NET_DEBUG > 4
 792         printk(KERN_DEBUG "%s: interrupt (status %x)\n", dev->name, status);
 793 #endif
 794
 795         if (lp->started == (STARTED_CU | STARTED_RU)) {
 796
 797                 do {
 798                         eexp_cmd_clear(dev);
 799
 800                         ack_cmd = SCB_ack(status);
 801                         scb_command(dev, ack_cmd);
 802                         outb(0,ioaddr+SIGNAL_CA);
 803
 804                         eexp_cmd_clear(dev);
 805
 806                         if (SCB_complete(status)) {
 807                                 if (!eexp_hw_lasttxstat(dev)) {
 808                                         printk("%s: tx interrupt but no status\n", dev->name);
 809                                 }
 810                         }
 811
 812                         if (SCB_rxdframe(status))
 813                                 eexp_hw_rx_pio(dev);
 814
 815                         status = scb_status(dev);
 816                 } while (status & 0xc000);
 817
 818                 if (SCB_RUdead(status))
 819                 {
 820                         printk(KERN_WARNING "%s: RU stopped: status %04x\n",
 821                                dev->name,status);
 822 #if 0
 823                         printk(KERN_WARNING "%s: cur_rfd=%04x, cur_rbd=%04x\n", dev->name, lp->cur_rfd, lp->cur_rbd);
 824                         outw(lp->cur_rfd, ioaddr+READ_PTR);
 825                         printk(KERN_WARNING "%s: [%04x]\n", dev->name, inw(ioaddr+DATAPORT));
 826                         outw(lp->cur_rfd+6, ioaddr+READ_PTR);
 827                         printk(KERN_WARNING "%s: rbd is %04x\n", dev->name, rbd= inw(ioaddr+DATAPORT));
 828                         outw(rbd, ioaddr+READ_PTR);
 829                         printk(KERN_WARNING "%s: [%04x %04x] ", dev->name, inw(ioaddr+DATAPORT), inw(ioaddr+DATAPORT));
 830                         outw(rbd+8, ioaddr+READ_PTR);
 831                         printk("[%04x]\n", inw(ioaddr+DATAPORT));
 832 #endif
 833                         dev->stats.rx_errors++;
 834 #if 1
 835                         eexp_hw_rxinit(dev);
 836 #else
 837                         lp->cur_rfd = lp->first_rfd;
 838 #endif
 839                         scb_wrrfa(dev, lp->rx_buf_start);
 840                         scb_command(dev, SCB_RUstart);
 841                         outb(0,ioaddr+SIGNAL_CA);
 842                 }
 843         } else {
 844                 if (status & 0x8000)
 845                         ack_cmd = eexp_start_irq(dev, status);
 846                 else
 847                         ack_cmd = SCB_ack(status);
 848                 scb_command(dev, ack_cmd);
 849                 outb(0,ioaddr+SIGNAL_CA);
 850         }
 851
 852         eexp_cmd_clear(dev);
 853
 854         outb(SIRQ_en|irqrmap[dev->irq], ioaddr+SET_IRQ);
 855
 856 #if NET_DEBUG > 6
 857         printk("%s: leaving eexp_irq()\n", dev->name);
 858 #endif
 859         outw(old_read_ptr, ioaddr+READ_PTR);
 860         outw(old_write_ptr, ioaddr+WRITE_PTR);
 861
 862         spin_unlock(&lp->lock);
 863         return IRQ_HANDLED;
 864 }
 865
 866 /*
 867  * Hardware access functions
 868  */
 869
 870 /*
 871  * Set the cable type to use.
 872  */
 873
 874 static void eexp_hw_set_interface(struct net_device *dev)
 875 {
 876         unsigned char oldval = inb(dev->base_addr + 0x300e);
 877         oldval &= ~0x82;
 878         switch (dev->if_port) {
 879         case TPE:
 880                 oldval |= 0x2;
 881         case BNC:
 882                 oldval |= 0x80;
 883                 break;
 884         }
 885         outb(oldval, dev->base_addr+0x300e);
 886         mdelay(20);
 887 }
 888
 889 /*
 890  * Check all the receive buffers, and hand any received packets
 891  * to the upper levels. Basic sanity check on each frame
 892  * descriptor, though we don't bother trying to fix broken ones.
 893  */
 894
 895 static void eexp_hw_rx_pio(struct net_device *dev)
 896 {
 897         struct net_local *lp = netdev_priv(dev);
 898         unsigned short rx_block = lp->rx_ptr;
 899         unsigned short boguscount = lp->num_rx_bufs;
 900         unsigned short ioaddr = dev->base_addr;
 901         unsigned short status;
 902
 903 #if NET_DEBUG > 6
 904         printk(KERN_DEBUG "%s: eexp_hw_rx()\n", dev->name);
 905 #endif
 906
 907         do {
 908                 unsigned short rfd_cmd, rx_next, pbuf, pkt_len;
 909
 910                 outw(rx_block, ioaddr + READ_PTR);
 911                 status = inw(ioaddr + DATAPORT);
 912
 913                 if (FD_Done(status))
 914                 {
 915                         rfd_cmd = inw(ioaddr + DATAPORT);
 916                         rx_next = inw(ioaddr + DATAPORT);
 917                         pbuf = inw(ioaddr + DATAPORT);
 918
 919                         outw(pbuf, ioaddr + READ_PTR);
 920                         pkt_len = inw(ioaddr + DATAPORT);
 921
 922                         if (rfd_cmd!=0x0000)
 923                         {
 924                                 printk(KERN_WARNING "%s: rfd_cmd not zero:0x%04x\n",
 925                                        dev->name, rfd_cmd);
 926                                 continue;
 927                         }
 928                         else if (pbuf!=rx_block+0x16)
 929                         {
 930                                 printk(KERN_WARNING "%s: rfd and rbd out of sync 0x%04x 0x%04x\n",
 931                                        dev->name, rx_block+0x16, pbuf);
 932                                 continue;
 933                         }
 934                         else if ((pkt_len & 0xc000)!=0xc000)
 935                         {
 936                                 printk(KERN_WARNING "%s: EOF or F not set on received buffer (%04x)\n",
 937                                        dev->name, pkt_len & 0xc000);
 938                                 continue;
 939                         }
 940                         else if (!FD_OK(status))
 941                         {
 942                                 dev->stats.rx_errors++;
 943                                 if (FD_CRC(status))
 944                                         dev->stats.rx_crc_errors++;
 945                                 if (FD_Align(status))
 946                                         dev->stats.rx_frame_errors++;
 947                                 if (FD_Resrc(status))
 948                                         dev->stats.rx_fifo_errors++;
 949                                 if (FD_DMA(status))
 950                                         dev->stats.rx_over_errors++;
 951                                 if (FD_Short(status))
 952                                         dev->stats.rx_length_errors++;
 953                         }
 954                         else
 955                         {
 956                                 struct sk_buff *skb;
 957                                 pkt_len &= 0x3fff;
 958                                 skb = dev_alloc_skb(pkt_len+16);
 959                                 if (skb == NULL)
 960                                 {
 961                                         printk(KERN_WARNING "%s: Memory squeeze, dropping packet\n",dev->name);
 962                                         dev->stats.rx_dropped++;
 963                                         break;
 964                                 }
 965                                 skb_reserve(skb, 2);
 966                                 outw(pbuf+10, ioaddr+READ_PTR);
 967                                 insw(ioaddr+DATAPORT, skb_put(skb,pkt_len),(pkt_len+1)>>1);
 968                                 skb->protocol = eth_type_trans(skb,dev);
 969                                 netif_rx(skb);
 970                                 dev->stats.rx_packets++;
 971                                 dev->stats.rx_bytes += pkt_len;
 972                         }
 973                         outw(rx_block, ioaddr+WRITE_PTR);
 974                         outw(0, ioaddr+DATAPORT);
 975                         outw(0, ioaddr+DATAPORT);
 976                         rx_block = rx_next;
 977                 }
 978         } while (FD_Done(status) && boguscount--);
 979         lp->rx_ptr = rx_block;
 980 }
 981
 982 /*
 983  * Hand a packet to the card for transmission
 984  * If we get here, we MUST have already checked
 985  * to make sure there is room in the transmit
 986  * buffer region.
 987  */
 988
 989 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
 990                        unsigned short len)
 991 {
 992         struct net_local *lp = netdev_priv(dev);
 993         unsigned short ioaddr = dev->base_addr;
 994
 995         if (LOCKUP16 || lp->width) {
 996                 /* Stop the CU so that there is no chance that it
 997                    jumps off to a bogus address while we are writing the
 998                    pointer to the next transmit packet in 8-bit mode --
 999                    this eliminates the "CU wedged" errors in 8-bit mode.
1000                    (Zoltan Szilagyi 10-12-96) */
1001                 scb_command(dev, SCB_CUsuspend);
1002                 outw(0xFFFF, ioaddr+SIGNAL_CA);
1003         }
1004
1005         outw(lp->tx_head, ioaddr + WRITE_PTR);
1006
1007         outw(0x0000, ioaddr + DATAPORT);
1008         outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1009         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
1010         outw(lp->tx_head+0x0e, ioaddr + DATAPORT);
1011
1012         outw(0x0000, ioaddr + DATAPORT);
1013         outw(0x0000, ioaddr + DATAPORT);
1014         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
1015
1016         outw(0x8000|len, ioaddr + DATAPORT);
1017         outw(-1, ioaddr + DATAPORT);
1018         outw(lp->tx_head+0x16, ioaddr + DATAPORT);
1019         outw(0, ioaddr + DATAPORT);
1020
1021         outsw(ioaddr + DATAPORT, buf, (len+1)>>1);
1022
1023         outw(lp->tx_tail+0xc, ioaddr + WRITE_PTR);
1024         outw(lp->tx_head, ioaddr + DATAPORT);
1025
1026         dev->trans_start = jiffies;
1027         lp->tx_tail = lp->tx_head;
1028         if (lp->tx_head==TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1029                 lp->tx_head = TX_BUF_START;
1030         else
1031                 lp->tx_head += TX_BUF_SIZE;
1032         if (lp->tx_head != lp->tx_reap)
1033                 netif_wake_queue(dev);
1034
1035         if (LOCKUP16 || lp->width) {
1036                 /* Restart the CU so that the packet can actually
1037                    be transmitted. (Zoltan Szilagyi 10-12-96) */
1038                 scb_command(dev, SCB_CUresume);
1039                 outw(0xFFFF, ioaddr+SIGNAL_CA);
1040         }
1041
1042         dev->stats.tx_packets++;
1043         lp->last_tx = jiffies;
1044 }
1045
1046 /*
1047  * Sanity check the suspected EtherExpress card
1048  * Read hardware address, reset card, size memory and initialize buffer
1049  * memory pointers. These are held in netdev_priv(), in case someone has more
1050  * than one card in a machine.
1051  */
1052
1053 static int __init eexp_hw_probe(struct net_device *dev, unsigned short ioaddr)
1054 {
1055         unsigned short hw_addr[3];
1056         unsigned char buswidth;
1057         unsigned int memory_size;
1058         int i;
1059         unsigned short xsum = 0;
1060         struct net_local *lp = netdev_priv(dev);
1061
1062         printk("%s: EtherExpress 16 at %#x ",dev->name,ioaddr);
1063
1064         outb(ASIC_RST, ioaddr+EEPROM_Ctrl);
1065         outb(0, ioaddr+EEPROM_Ctrl);
1066         udelay(500);
1067         outb(i586_RST, ioaddr+EEPROM_Ctrl);
1068
1069         hw_addr[0] = eexp_hw_readeeprom(ioaddr,2);
1070         hw_addr[1] = eexp_hw_readeeprom(ioaddr,3);
1071         hw_addr[2] = eexp_hw_readeeprom(ioaddr,4);
1072
1073         /* Standard Address or Compaq LTE Address */
1074         if (!((hw_addr[2]==0x00aa && ((hw_addr[1] & 0xff00)==0x0000)) ||
1075               (hw_addr[2]==0x0080 && ((hw_addr[1] & 0xff00)==0x5F00))))
1076         {
1077                 printk(" rejected: invalid address %04x%04x%04x\n",
1078                         hw_addr[2],hw_addr[1],hw_addr[0]);
1079                 return -ENODEV;
1080         }
1081
1082         /* Calculate the EEPROM checksum.  Carry on anyway if it's bad,
1083          * though.
1084          */
1085         for (i = 0; i < 64; i++)
1086                 xsum += eexp_hw_readeeprom(ioaddr, i);
1087         if (xsum != 0xbaba)
1088                 printk(" (bad EEPROM xsum 0x%02x)", xsum);
1089
1090         dev->base_addr = ioaddr;
1091         for ( i=0 ; i<6 ; i++ )
1092                 dev->dev_addr[i] = ((unsigned char *)hw_addr)[5-i];
1093
1094         {
1095                 static char irqmap[]={0, 9, 3, 4, 5, 10, 11, 0};
1096                 unsigned short setupval = eexp_hw_readeeprom(ioaddr,0);
1097
1098                 /* Use the IRQ from EEPROM if none was given */
1099                 if (!dev->irq)
1100                         dev->irq = irqmap[setupval>>13];
1101
1102                 if (dev->if_port == 0xff) {
1103                         dev->if_port = !(setupval & 0x1000) ? AUI :
1104                                 eexp_hw_readeeprom(ioaddr,5) & 0x1 ? TPE : BNC;
1105                 }
1106
1107                 buswidth = !((setupval & 0x400) >> 10);
1108         }
1109
1110         memset(lp, 0, sizeof(struct net_local));
1111         spin_lock_init(&lp->lock);
1112
1113         printk("(IRQ %d, %s connector, %d-bit bus", dev->irq,
1114                eexp_ifmap[dev->if_port], buswidth?8:16);
1115
1116         if (!request_region(dev->base_addr + 0x300e, 1, "EtherExpress"))
1117                 return -EBUSY;
1118
1119         eexp_hw_set_interface(dev);
1120
1121         release_region(dev->base_addr + 0x300e, 1);
1122
1123         /* Find out how much RAM we have on the card */
1124         outw(0, dev->base_addr + WRITE_PTR);
1125         for (i = 0; i < 32768; i++)
1126                 outw(0, dev->base_addr + DATAPORT);
1127
1128         for (memory_size = 0; memory_size < 64; memory_size++)
1129         {
1130                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1131                 if (inw(dev->base_addr+DATAPORT))
1132                         break;
1133                 outw(memory_size<<10, dev->base_addr + WRITE_PTR);
1134                 outw(memory_size | 0x5000, dev->base_addr+DATAPORT);
1135                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1136                 if (inw(dev->base_addr+DATAPORT) != (memory_size | 0x5000))
1137                         break;
1138         }
1139
1140         /* Sort out the number of buffers.  We may have 16, 32, 48 or 64k
1141          * of RAM to play with.
1142          */
1143         lp->num_tx_bufs = 4;
1144         lp->rx_buf_end = 0x3ff6;
1145         switch (memory_size)
1146         {
1147         case 64:
1148                 lp->rx_buf_end += 0x4000;
1149         case 48:
1150                 lp->num_tx_bufs += 4;
1151                 lp->rx_buf_end += 0x4000;
1152         case 32:
1153                 lp->rx_buf_end += 0x4000;
1154         case 16:
1155                 printk(", %dk RAM)\n", memory_size);
1156                 break;
1157         default:
1158                 printk(") bad memory size (%dk).\n", memory_size);
1159                 return -ENODEV;
1160                 break;
1161         }
1162
1163         lp->rx_buf_start = TX_BUF_START + (lp->num_tx_bufs*TX_BUF_SIZE);
1164         lp->width = buswidth;
1165
1166         dev->open = eexp_open;
1167         dev->stop = eexp_close;
1168         dev->hard_start_xmit = eexp_xmit;
1169         dev->set_multicast_list = &eexp_set_multicast;
1170         dev->tx_timeout = eexp_timeout;
1171         dev->watchdog_timeo = 2*HZ;
1172
1173         return register_netdev(dev);
1174 }
1175
1176 /*
1177  * Read a word from the EtherExpress on-board serial EEPROM.
1178  * The EEPROM contains 64 words of 16 bits.
1179  */
1180 static unsigned short __init eexp_hw_readeeprom(unsigned short ioaddr,
1181                                                     unsigned char location)
1182 {
1183         unsigned short cmd = 0x180|(location&0x7f);
1184         unsigned short rval = 0,wval = EC_CS|i586_RST;
1185         int i;
1186
1187         outb(EC_CS|i586_RST,ioaddr+EEPROM_Ctrl);
1188         for (i=0x100 ; i ; i>>=1 )
1189         {
1190                 if (cmd&i)
1191                         wval |= EC_Wr;
1192                 else
1193                         wval &= ~EC_Wr;
1194
1195                 outb(wval,ioaddr+EEPROM_Ctrl);
1196                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1197                 eeprom_delay();
1198                 outb(wval,ioaddr+EEPROM_Ctrl);
1199                 eeprom_delay();
1200         }
1201         wval &= ~EC_Wr;
1202         outb(wval,ioaddr+EEPROM_Ctrl);
1203         for (i=0x8000 ; i ; i>>=1 )
1204         {
1205                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1206                 eeprom_delay();
1207                 if (inb(ioaddr+EEPROM_Ctrl)&EC_Rd)
1208                         rval |= i;
1209                 outb(wval,ioaddr+EEPROM_Ctrl);
1210                 eeprom_delay();
1211         }
1212         wval &= ~EC_CS;
1213         outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1214         eeprom_delay();
1215         outb(wval,ioaddr+EEPROM_Ctrl);
1216         eeprom_delay();
1217         return rval;
1218 }
1219
1220 /*
1221  * Reap tx buffers and return last transmit status.
1222  * if ==0 then either:
1223  *    a) we're not transmitting anything, so why are we here?
1224  *    b) we've died.
1225  * otherwise, Stat_Busy(return) means we've still got some packets
1226  * to transmit, Stat_Done(return) means our buffers should be empty
1227  * again
1228  */
1229
1230 static unsigned short eexp_hw_lasttxstat(struct net_device *dev)
1231 {
1232         struct net_local *lp = netdev_priv(dev);
1233         unsigned short tx_block = lp->tx_reap;
1234         unsigned short status;
1235
1236         if (!netif_queue_stopped(dev) && lp->tx_head==lp->tx_reap)
1237                 return 0x0000;
1238
1239         do
1240         {
1241                 outw(tx_block & ~31, dev->base_addr + SM_PTR);
1242                 status = inw(dev->base_addr + SHADOW(tx_block));
1243                 if (!Stat_Done(status))
1244                 {
1245                         lp->tx_link = tx_block;
1246                         return status;
1247                 }
1248                 else
1249                 {
1250                         lp->last_tx_restart = 0;
1251                         dev->stats.collisions += Stat_NoColl(status);
1252                         if (!Stat_OK(status))
1253                         {
1254                                 char *whatsup = NULL;
1255                                 dev->stats.tx_errors++;
1256                                 if (Stat_Abort(status))
1257                                         dev->stats.tx_aborted_errors++;
1258                                 if (Stat_TNoCar(status)) {
1259                                         whatsup = "aborted, no carrier";
1260                                         dev->stats.tx_carrier_errors++;
1261                                 }
1262                                 if (Stat_TNoCTS(status)) {
1263                                         whatsup = "aborted, lost CTS";
1264                                         dev->stats.tx_carrier_errors++;
1265                                 }
1266                                 if (Stat_TNoDMA(status)) {
1267                                         whatsup = "FIFO underran";
1268                                         dev->stats.tx_fifo_errors++;
1269                                 }
1270                                 if (Stat_TXColl(status)) {
1271                                         whatsup = "aborted, too many collisions";
1272                                         dev->stats.tx_aborted_errors++;
1273                                 }
1274                                 if (whatsup)
1275                                         printk(KERN_INFO "%s: transmit %s\n",
1276                                                dev->name, whatsup);
1277                         }
1278                         else
1279                                 dev->stats.tx_packets++;
1280                 }
1281                 if (tx_block == TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1282                         lp->tx_reap = tx_block = TX_BUF_START;
1283                 else
1284                         lp->tx_reap = tx_block += TX_BUF_SIZE;
1285                 netif_wake_queue(dev);
1286         }
1287         while (lp->tx_reap != lp->tx_head);
1288
1289         lp->tx_link = lp->tx_tail + 0x08;
1290
1291         return status;
1292 }
1293
1294 /*
1295  * This should never happen. It is called when some higher routine detects
1296  * that the CU has stopped, to try to restart it from the last packet we knew
1297  * we were working on, or the idle loop if we had finished for the time.
1298  */
1299
1300 static void eexp_hw_txrestart(struct net_device *dev)
1301 {
1302         struct net_local *lp = netdev_priv(dev);
1303         unsigned short ioaddr = dev->base_addr;
1304
1305         lp->last_tx_restart = lp->tx_link;
1306         scb_wrcbl(dev, lp->tx_link);
1307         scb_command(dev, SCB_CUstart);
1308         outb(0,ioaddr+SIGNAL_CA);
1309
1310         {
1311                 unsigned short boguscount=50,failcount=5;
1312                 while (!scb_status(dev))
1313                 {
1314                         if (!--boguscount)
1315                         {
1316                                 if (--failcount)
1317                                 {
1318                                         printk(KERN_WARNING "%s: CU start timed out, status %04x, cmd %04x\n", dev->name, scb_status(dev), scb_rdcmd(dev));
1319                                         scb_wrcbl(dev, lp->tx_link);
1320                                         scb_command(dev, SCB_CUstart);
1321                                         outb(0,ioaddr+SIGNAL_CA);
1322                                         boguscount = 100;
1323                                 }
1324                                 else
1325                                 {
1326                                         printk(KERN_WARNING "%s: Failed to restart CU, resetting board...\n",dev->name);
1327                                         eexp_hw_init586(dev);
1328                                         netif_wake_queue(dev);
1329                                         return;
1330                                 }
1331                         }
1332                 }
1333         }
1334 }
1335
1336 /*
1337  * Writes down the list of transmit buffers into card memory.  Each
1338  * entry consists of an 82586 transmit command, followed by a jump
1339  * pointing to itself.  When we want to transmit a packet, we write
1340  * the data into the appropriate transmit buffer and then modify the
1341  * preceding jump to point at the new transmit command.  This means that
1342  * the 586 command unit is continuously active.
1343  */
1344
1345 static void eexp_hw_txinit(struct net_device *dev)
1346 {
1347         struct net_local *lp = netdev_priv(dev);
1348         unsigned short tx_block = TX_BUF_START;
1349         unsigned short curtbuf;
1350         unsigned short ioaddr = dev->base_addr;
1351
1352         for ( curtbuf=0 ; curtbuf<lp->num_tx_bufs ; curtbuf++ )
1353         {
1354                 outw(tx_block, ioaddr + WRITE_PTR);
1355
1356                 outw(0x0000, ioaddr + DATAPORT);
1357                 outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1358                 outw(tx_block+0x08, ioaddr + DATAPORT);
1359                 outw(tx_block+0x0e, ioaddr + DATAPORT);
1360
1361                 outw(0x0000, ioaddr + DATAPORT);
1362                 outw(0x0000, ioaddr + DATAPORT);
1363                 outw(tx_block+0x08, ioaddr + DATAPORT);
1364
1365                 outw(0x8000, ioaddr + DATAPORT);
1366                 outw(-1, ioaddr + DATAPORT);
1367                 outw(tx_block+0x16, ioaddr + DATAPORT);
1368                 outw(0x0000, ioaddr + DATAPORT);
1369
1370                 tx_block += TX_BUF_SIZE;
1371         }
1372         lp->tx_head = TX_BUF_START;
1373         lp->tx_reap = TX_BUF_START;
1374         lp->tx_tail = tx_block - TX_BUF_SIZE;
1375         lp->tx_link = lp->tx_tail + 0x08;
1376         lp->rx_buf_start = tx_block;
1377
1378 }
1379
1380 /*
1381  * Write the circular list of receive buffer descriptors to card memory.
1382  * The end of the list isn't marked, which means that the 82586 receive
1383  * unit will loop until buffers become available (this avoids it giving us
1384  * "out of resources" messages).
1385  */
1386
1387 static void eexp_hw_rxinit(struct net_device *dev)
1388 {
1389         struct net_local *lp = netdev_priv(dev);
1390         unsigned short rx_block = lp->rx_buf_start;
1391         unsigned short ioaddr = dev->base_addr;
1392
1393         lp->num_rx_bufs = 0;
1394         lp->rx_first = lp->rx_ptr = rx_block;
1395         do
1396         {
1397                 lp->num_rx_bufs++;
1398
1399                 outw(rx_block, ioaddr + WRITE_PTR);
1400
1401                 outw(0, ioaddr + DATAPORT);  outw(0, ioaddr+DATAPORT);
1402                 outw(rx_block + RX_BUF_SIZE, ioaddr+DATAPORT);
1403                 outw(0xffff, ioaddr+DATAPORT);
1404
1405                 outw(0x0000, ioaddr+DATAPORT);
1406                 outw(0xdead, ioaddr+DATAPORT);
1407                 outw(0xdead, ioaddr+DATAPORT);
1408                 outw(0xdead, ioaddr+DATAPORT);
1409                 outw(0xdead, ioaddr+DATAPORT);
1410                 outw(0xdead, ioaddr+DATAPORT);
1411                 outw(0xdead, ioaddr+DATAPORT);
1412
1413                 outw(0x0000, ioaddr+DATAPORT);
1414                 outw(rx_block + RX_BUF_SIZE + 0x16, ioaddr+DATAPORT);
1415                 outw(rx_block + 0x20, ioaddr+DATAPORT);
1416                 outw(0, ioaddr+DATAPORT);
1417                 outw(RX_BUF_SIZE-0x20, ioaddr+DATAPORT);
1418
1419                 lp->rx_last = rx_block;
1420                 rx_block += RX_BUF_SIZE;
1421         } while (rx_block <= lp->rx_buf_end-RX_BUF_SIZE);
1422
1423
1424         /* Make first Rx frame descriptor point to first Rx buffer
1425            descriptor */
1426         outw(lp->rx_first + 6, ioaddr+WRITE_PTR);
1427         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1428
1429         /* Close Rx frame descriptor ring */
1430         outw(lp->rx_last + 4, ioaddr+WRITE_PTR);
1431         outw(lp->rx_first, ioaddr+DATAPORT);
1432
1433         /* Close Rx buffer descriptor ring */
1434         outw(lp->rx_last + 0x16 + 2, ioaddr+WRITE_PTR);
1435         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1436
1437 }
1438
1439 /*
1440  * Un-reset the 586, and start the configuration sequence. We don't wait for
1441  * this to finish, but allow the interrupt handler to start the CU and RU for
1442  * us.  We can't start the receive/transmission system up before we know that
1443  * the hardware is configured correctly.
1444  */
1445
1446 static void eexp_hw_init586(struct net_device *dev)
1447 {
1448         struct net_local *lp = netdev_priv(dev);
1449         unsigned short ioaddr = dev->base_addr;
1450         int i;
1451
1452 #if NET_DEBUG > 6
1453         printk("%s: eexp_hw_init586()\n", dev->name);
1454 #endif
1455
1456         lp->started = 0;
1457
1458         set_loopback(dev);
1459
1460         outb(SIRQ_dis|irqrmap[dev->irq],ioaddr+SET_IRQ);
1461
1462         /* Download the startup code */
1463         outw(lp->rx_buf_end & ~31, ioaddr + SM_PTR);
1464         outw(lp->width?0x0001:0x0000, ioaddr + 0x8006);
1465         outw(0x0000, ioaddr + 0x8008);
1466         outw(0x0000, ioaddr + 0x800a);
1467         outw(0x0000, ioaddr + 0x800c);
1468         outw(0x0000, ioaddr + 0x800e);
1469
1470         for (i = 0; i < (sizeof(start_code)); i+=32) {
1471                 int j;
1472                 outw(i, ioaddr + SM_PTR);
1473                 for (j = 0; j < 16; j+=2)
1474                         outw(start_code[(i+j)/2],
1475                              ioaddr+0x4000+j);
1476                 for (j = 0; j < 16; j+=2)
1477                         outw(start_code[(i+j+16)/2],
1478                              ioaddr+0x8000+j);
1479         }
1480
1481         /* Do we want promiscuous mode or multicast? */
1482         outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1483         i = inw(ioaddr+SHADOW(CONF_PROMISC));
1484         outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1485              ioaddr+SHADOW(CONF_PROMISC));
1486         lp->was_promisc = dev->flags & IFF_PROMISC;
1487 #if 0
1488         eexp_setup_filter(dev);
1489 #endif
1490
1491         /* Write our hardware address */
1492         outw(CONF_HWADDR & ~31, ioaddr+SM_PTR);
1493         outw(((unsigned short *)dev->dev_addr)[0], ioaddr+SHADOW(CONF_HWADDR));
1494         outw(((unsigned short *)dev->dev_addr)[1],
1495              ioaddr+SHADOW(CONF_HWADDR+2));
1496         outw(((unsigned short *)dev->dev_addr)[2],
1497              ioaddr+SHADOW(CONF_HWADDR+4));
1498
1499         eexp_hw_txinit(dev);
1500         eexp_hw_rxinit(dev);
1501
1502         outb(0,ioaddr+EEPROM_Ctrl);
1503         mdelay(5);
1504
1505         scb_command(dev, 0xf000);
1506         outb(0,ioaddr+SIGNAL_CA);
1507
1508         outw(0, ioaddr+SM_PTR);
1509
1510         {
1511                 unsigned short rboguscount=50,rfailcount=5;
1512                 while (inw(ioaddr+0x4000))
1513                 {
1514                         if (!--rboguscount)
1515                         {
1516                                 printk(KERN_WARNING "%s: i82586 reset timed out, kicking...\n",
1517                                         dev->name);
1518                                 scb_command(dev, 0);
1519                                 outb(0,ioaddr+SIGNAL_CA);
1520                                 rboguscount = 100;
1521                                 if (!--rfailcount)
1522                                 {
1523                                         printk(KERN_WARNING "%s: i82586 not responding, giving up.\n",
1524                                                 dev->name);
1525                                         return;
1526                                 }
1527                         }
1528                 }
1529         }
1530
1531         scb_wrcbl(dev, CONF_LINK);
1532         scb_command(dev, 0xf000|SCB_CUstart);
1533         outb(0,ioaddr+SIGNAL_CA);
1534
1535         {
1536                 unsigned short iboguscount=50,ifailcount=5;
1537                 while (!scb_status(dev))
1538                 {
1539                         if (!--iboguscount)
1540                         {
1541                                 if (--ifailcount)
1542                                 {
1543                                         printk(KERN_WARNING "%s: i82586 initialization timed out, status %04x, cmd %04x\n",
1544                                                 dev->name, scb_status(dev), scb_rdcmd(dev));
1545                                         scb_wrcbl(dev, CONF_LINK);
1546                                         scb_command(dev, 0xf000|SCB_CUstart);
1547                                         outb(0,ioaddr+SIGNAL_CA);
1548                                         iboguscount = 100;
1549                                 }
1550                                 else
1551                                 {
1552                                         printk(KERN_WARNING "%s: Failed to initialize i82586, giving up.\n",dev->name);
1553                                         return;
1554                                 }
1555                         }
1556                 }
1557         }
1558
1559         clear_loopback(dev);
1560         outb(SIRQ_en|irqrmap[dev->irq],ioaddr+SET_IRQ);
1561
1562         lp->init_time = jiffies;
1563 #if NET_DEBUG > 6
1564         printk("%s: leaving eexp_hw_init586()\n", dev->name);
1565 #endif
1566         return;
1567 }
1568
1569 static void eexp_setup_filter(struct net_device *dev)
1570 {
1571         struct dev_mc_list *dmi;
1572         unsigned short ioaddr = dev->base_addr;
1573         int count = dev->mc_count;
1574         int i;
1575         if (count > 8) {
1576                 printk(KERN_INFO "%s: too many multicast addresses (%d)\n",
1577                        dev->name, count);
1578                 count = 8;
1579         }
1580
1581         outw(CONF_NR_MULTICAST & ~31, ioaddr+SM_PTR);
1582         outw(6*count, ioaddr+SHADOW(CONF_NR_MULTICAST));
1583         for (i = 0, dmi = dev->mc_list; i < count; i++, dmi = dmi->next) {
1584                 unsigned short *data;
1585                 if (!dmi) {
1586                         printk(KERN_INFO "%s: too few multicast addresses\n", dev->name);
1587                         break;
1588                 }
1589                 if (dmi->dmi_addrlen != ETH_ALEN) {
1590                         printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
1591                         continue;
1592                 }
1593                 data = (unsigned short *)dmi->dmi_addr;
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         }
1601 }
1602
1603 /*
1604  * Set or clear the multicast filter for this adaptor.
1605  */
1606 static void
1607 eexp_set_multicast(struct net_device *dev)
1608 {
1609         unsigned short ioaddr = dev->base_addr;
1610         struct net_local *lp = netdev_priv(dev);
1611         int kick = 0, i;
1612         if ((dev->flags & IFF_PROMISC) != lp->was_promisc) {
1613                 outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1614                 i = inw(ioaddr+SHADOW(CONF_PROMISC));
1615                 outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1616                      ioaddr+SHADOW(CONF_PROMISC));
1617                 lp->was_promisc = dev->flags & IFF_PROMISC;
1618                 kick = 1;
1619         }
1620         if (!(dev->flags & IFF_PROMISC)) {
1621                 eexp_setup_filter(dev);
1622                 if (lp->old_mc_count != dev->mc_count) {
1623                         kick = 1;
1624                         lp->old_mc_count = dev->mc_count;
1625                 }
1626         }
1627         if (kick) {
1628                 unsigned long oj;
1629                 scb_command(dev, SCB_CUsuspend);
1630                 outb(0, ioaddr+SIGNAL_CA);
1631                 outb(0, ioaddr+SIGNAL_CA);
1632 #if 0
1633                 printk("%s: waiting for CU to go suspended\n", dev->name);
1634 #endif
1635                 oj = jiffies;
1636                 while ((SCB_CUstat(scb_status(dev)) == 2) &&
1637                        (time_before(jiffies, oj + 2000)));
1638                 if (SCB_CUstat(scb_status(dev)) == 2)
1639                         printk("%s: warning, CU didn't stop\n", dev->name);
1640                 lp->started &= ~(STARTED_CU);
1641                 scb_wrcbl(dev, CONF_LINK);
1642                 scb_command(dev, SCB_CUstart);
1643                 outb(0, ioaddr+SIGNAL_CA);
1644         }
1645 }
1646
1647
1648 /*
1649  * MODULE stuff
1650  */
1651
1652 #ifdef MODULE
1653
1654 #define EEXP_MAX_CARDS     4    /* max number of cards to support */
1655
1656 static struct net_device *dev_eexp[EEXP_MAX_CARDS];
1657 static int irq[EEXP_MAX_CARDS];
1658 static int io[EEXP_MAX_CARDS];
1659
1660 module_param_array(io, int, NULL, 0);
1661 module_param_array(irq, int, NULL, 0);
1662 MODULE_PARM_DESC(io, "EtherExpress 16 I/O base address(es)");
1663 MODULE_PARM_DESC(irq, "EtherExpress 16 IRQ number(s)");
1664 MODULE_LICENSE("GPL");
1665
1666
1667 /* Ideally the user would give us io=, irq= for every card.  If any parameters
1668  * are specified, we verify and then use them.  If no parameters are given, we
1669  * autoprobe for one card only.
1670  */
1671 int __init init_module(void)
1672 {
1673         struct net_device *dev;
1674         int this_dev, found = 0;
1675
1676         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1677                 dev = alloc_etherdev(sizeof(struct net_local));
1678                 dev->irq = irq[this_dev];
1679                 dev->base_addr = io[this_dev];
1680                 if (io[this_dev] == 0) {
1681                         if (this_dev)
1682                                 break;
1683                         printk(KERN_NOTICE "eexpress.c: Module autoprobe not recommended, give io=xx.\n");
1684                 }
1685                 if (do_express_probe(dev) == 0) {
1686                         dev_eexp[this_dev] = dev;
1687                         found++;
1688                         continue;
1689                 }
1690                 printk(KERN_WARNING "eexpress.c: Failed to register card at 0x%x.\n", io[this_dev]);
1691                 free_netdev(dev);
1692                 break;
1693         }
1694         if (found)
1695                 return 0;
1696         return -ENXIO;
1697 }
1698
1699 void __exit cleanup_module(void)
1700 {
1701         int this_dev;
1702
1703         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1704                 struct net_device *dev = dev_eexp[this_dev];
1705                 if (dev) {
1706                         unregister_netdev(dev);
1707                         free_netdev(dev);
1708                 }
1709         }
1710 }
1711 #endif
1712
1713 /*
1714  * Local Variables:
1715  *  c-file-style: "linux"
1716  *  tab-width: 8
1717  * End:
1718  */