git.oblomov.eu Git - linux-2.6/blob - drivers/net/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@redhat.com>
  12  * Added MCA support Adam Fritzler <mid@auk.cx>
  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
 119 #include <asm/system.h>
 120 #include <asm/io.h>
 121 #include <asm/irq.h>
 122
 123 #ifndef NET_DEBUG
 124 #define NET_DEBUG 4
 125 #endif
 126
 127 #include "eexpress.h"
 128
 129 #define EEXP_IO_EXTENT  16
 130
 131 /*
 132  * Private data declarations
 133  */
 134
 135 struct net_local
 136 {
 137         struct net_device_stats stats;
 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 multicast addresses */
 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 struct net_device_stats *eexp_stats(struct net_device *dev);
 250 static int eexp_xmit(struct sk_buff *buf, struct net_device *dev);
 251
 252 static irqreturn_t eexp_irq(int irq, void *dev_addr, struct pt_regs *regs);
 253 static void eexp_set_multicast(struct net_device *dev);
 254
 255 /*
 256  * Prototypes for hardware access functions
 257  */
 258
 259 static void eexp_hw_rx_pio(struct net_device *dev);
 260 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
 261                        unsigned short len);
 262 static int eexp_hw_probe(struct net_device *dev,unsigned short ioaddr);
 263 static unsigned short eexp_hw_readeeprom(unsigned short ioaddr,
 264                                          unsigned char location);
 265
 266 static unsigned short eexp_hw_lasttxstat(struct net_device *dev);
 267 static void eexp_hw_txrestart(struct net_device *dev);
 268
 269 static void eexp_hw_txinit    (struct net_device *dev);
 270 static void eexp_hw_rxinit    (struct net_device *dev);
 271
 272 static void eexp_hw_init586   (struct net_device *dev);
 273 static void eexp_setup_filter (struct net_device *dev);
 274
 275 static char *eexp_ifmap[]={"AUI", "BNC", "RJ45"};
 276 enum eexp_iftype {AUI=0, BNC=1, TPE=2};
 277
 278 #define STARTED_RU      2
 279 #define STARTED_CU      1
 280
 281 /*
 282  * Primitive hardware access functions.
 283  */
 284
 285 static inline unsigned short scb_status(struct net_device *dev)
 286 {
 287         return inw(dev->base_addr + 0xc008);
 288 }
 289
 290 static inline unsigned short scb_rdcmd(struct net_device *dev)
 291 {
 292         return inw(dev->base_addr + 0xc00a);
 293 }
 294
 295 static inline void scb_command(struct net_device *dev, unsigned short cmd)
 296 {
 297         outw(cmd, dev->base_addr + 0xc00a);
 298 }
 299
 300 static inline void scb_wrcbl(struct net_device *dev, unsigned short val)
 301 {
 302         outw(val, dev->base_addr + 0xc00c);
 303 }
 304
 305 static inline void scb_wrrfa(struct net_device *dev, unsigned short val)
 306 {
 307         outw(val, dev->base_addr + 0xc00e);
 308 }
 309
 310 static inline void set_loopback(struct net_device *dev)
 311 {
 312         outb(inb(dev->base_addr + Config) | 2, dev->base_addr + Config);
 313 }
 314
 315 static inline void clear_loopback(struct net_device *dev)
 316 {
 317         outb(inb(dev->base_addr + Config) & ~2, dev->base_addr + Config);
 318 }
 319
 320 static inline unsigned short int SHADOW(short int addr)
 321 {
 322         addr &= 0x1f;
 323         if (addr > 0xf) addr += 0x3ff0;
 324         return addr + 0x4000;
 325 }
 326
 327 /*
 328  * Linux interface
 329  */
 330
 331 /*
 332  * checks for presence of EtherExpress card
 333  */
 334
 335 static int __init do_express_probe(struct net_device *dev)
 336 {
 337         unsigned short *port;
 338         static unsigned short ports[] = { 0x240,0x300,0x310,0x270,0x320,0x340,0 };
 339         unsigned short ioaddr = dev->base_addr;
 340         int dev_irq = dev->irq;
 341         int err;
 342
 343         SET_MODULE_OWNER(dev);
 344
 345         dev->if_port = 0xff; /* not set */
 346
 347 #ifdef CONFIG_MCA_LEGACY
 348         if (MCA_bus) {
 349                 int slot = 0;
 350
 351                 /*
 352                  * Only find one card at a time.  Subsequent calls
 353                  * will find others, however, proper multicard MCA
 354                  * probing and setup can't be done with the
 355                  * old-style Space.c init routines.  -- ASF
 356                  */
 357                 while (slot != MCA_NOTFOUND) {
 358                         int pos0, pos1;
 359
 360                         slot = mca_find_unused_adapter(0x628B, slot);
 361                         if (slot == MCA_NOTFOUND)
 362                                 break;
 363
 364                         pos0 = mca_read_stored_pos(slot, 2);
 365                         pos1 = mca_read_stored_pos(slot, 3);
 366                         ioaddr = mca_iomap[pos1&0xf];
 367
 368                         dev->irq = mca_irqmap[(pos1>>4)&0x7];
 369
 370                         /*
 371                          * XXX: Transciever selection is done
 372                          * differently on the MCA version.
 373                          * How to get it to select something
 374                          * other than external/AUI is currently
 375                          * unknown.  This code is just for looks. -- ASF
 376                          */
 377                         if ((pos0 & 0x7) == 0x1)
 378                                 dev->if_port = AUI;
 379                         else if ((pos0 & 0x7) == 0x5) {
 380                                 if (pos1 & 0x80)
 381                                         dev->if_port = BNC;
 382                                 else
 383                                         dev->if_port = TPE;
 384                         }
 385
 386                         mca_set_adapter_name(slot, "Intel EtherExpress 16 MCA");
 387                         mca_set_adapter_procfn(slot, NULL, dev);
 388                         mca_mark_as_used(slot);
 389
 390                         break;
 391                 }
 392         }
 393 #endif
 394         if (ioaddr&0xfe00) {
 395                 if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress"))
 396                         return -EBUSY;
 397                 err = eexp_hw_probe(dev,ioaddr);
 398                 release_region(ioaddr, EEXP_IO_EXTENT);
 399                 return err;
 400         } else if (ioaddr)
 401                 return -ENXIO;
 402
 403         for (port=&ports[0] ; *port ; port++ )
 404         {
 405                 unsigned short sum = 0;
 406                 int i;
 407                 if (!request_region(*port, EEXP_IO_EXTENT, "EtherExpress"))
 408                         continue;
 409                 for ( i=0 ; i<4 ; i++ )
 410                 {
 411                         unsigned short t;
 412                         t = inb(*port + ID_PORT);
 413                         sum |= (t>>4) << ((t & 0x03)<<2);
 414                 }
 415                 if (sum==0xbaba && !eexp_hw_probe(dev,*port)) {
 416                         release_region(*port, EEXP_IO_EXTENT);
 417                         return 0;
 418                 }
 419                 release_region(*port, EEXP_IO_EXTENT);
 420                 dev->irq = dev_irq;
 421         }
 422         return -ENODEV;
 423 }
 424
 425 #ifndef MODULE
 426 struct net_device * __init express_probe(int unit)
 427 {
 428         struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
 429         int err;
 430
 431         if (!dev)
 432                 return ERR_PTR(-ENOMEM);
 433
 434         sprintf(dev->name, "eth%d", unit);
 435         netdev_boot_setup_check(dev);
 436
 437         err = do_express_probe(dev);
 438         if (!err)
 439                 return dev;
 440         free_netdev(dev);
 441         return ERR_PTR(err);
 442 }
 443 #endif
 444
 445 /*
 446  * open and initialize the adapter, ready for use
 447  */
 448
 449 static int eexp_open(struct net_device *dev)
 450 {
 451         int ret;
 452         unsigned short ioaddr = dev->base_addr;
 453         struct net_local *lp = netdev_priv(dev);
 454
 455 #if NET_DEBUG > 6
 456         printk(KERN_DEBUG "%s: eexp_open()\n", dev->name);
 457 #endif
 458
 459         if (!dev->irq || !irqrmap[dev->irq])
 460                 return -ENXIO;
 461
 462         ret = request_irq(dev->irq,&eexp_irq,0,dev->name,dev);
 463         if (ret) return ret;
 464
 465         if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress")) {
 466                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 467                         , ioaddr);
 468                 goto err_out1;
 469         }
 470         if (!request_region(ioaddr+0x4000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 471                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 472                         , ioaddr+0x4000);
 473                 goto err_out2;
 474         }
 475         if (!request_region(ioaddr+0x8000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 476                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 477                         , ioaddr+0x8000);
 478                 goto err_out3;
 479         }
 480         if (!request_region(ioaddr+0xc000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
 481                 printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
 482                         , ioaddr+0xc000);
 483                 goto err_out4;
 484         }
 485
 486         if (lp->width) {
 487                 printk("%s: forcing ASIC to 8-bit mode\n", dev->name);
 488                 outb(inb(dev->base_addr+Config)&~4, dev->base_addr+Config);
 489         }
 490
 491         eexp_hw_init586(dev);
 492         netif_start_queue(dev);
 493 #if NET_DEBUG > 6
 494         printk(KERN_DEBUG "%s: leaving eexp_open()\n", dev->name);
 495 #endif
 496         return 0;
 497
 498         err_out4:
 499                 release_region(ioaddr+0x8000, EEXP_IO_EXTENT);
 500         err_out3:
 501                 release_region(ioaddr+0x4000, EEXP_IO_EXTENT);
 502         err_out2:
 503                 release_region(ioaddr, EEXP_IO_EXTENT);
 504         err_out1:
 505                 free_irq(dev->irq, dev);
 506                 return -EBUSY;
 507 }
 508
 509 /*
 510  * close and disable the interface, leaving the 586 in reset.
 511  */
 512
 513 static int eexp_close(struct net_device *dev)
 514 {
 515         unsigned short ioaddr = dev->base_addr;
 516         struct net_local *lp = netdev_priv(dev);
 517
 518         int irq = dev->irq;
 519
 520         netif_stop_queue(dev);
 521
 522         outb(SIRQ_dis|irqrmap[irq],ioaddr+SET_IRQ);
 523         lp->started = 0;
 524         scb_command(dev, SCB_CUsuspend|SCB_RUsuspend);
 525         outb(0,ioaddr+SIGNAL_CA);
 526         free_irq(irq,dev);
 527         outb(i586_RST,ioaddr+EEPROM_Ctrl);
 528         release_region(ioaddr, EEXP_IO_EXTENT);
 529         release_region(ioaddr+0x4000, 16);
 530         release_region(ioaddr+0x8000, 16);
 531         release_region(ioaddr+0xc000, 16);
 532
 533         return 0;
 534 }
 535
 536 /*
 537  * Return interface stats
 538  */
 539
 540 static struct net_device_stats *eexp_stats(struct net_device *dev)
 541 {
 542         struct net_local *lp = netdev_priv(dev);
 543
 544         return &lp->stats;
 545 }
 546
 547 /*
 548  * This gets called when a higher level thinks we are broken.  Check that
 549  * nothing has become jammed in the CU.
 550  */
 551
 552 static void unstick_cu(struct net_device *dev)
 553 {
 554         struct net_local *lp = netdev_priv(dev);
 555         unsigned short ioaddr = dev->base_addr;
 556
 557         if (lp->started)
 558         {
 559                 if ((jiffies - dev->trans_start)>50)
 560                 {
 561                         if (lp->tx_link==lp->last_tx_restart)
 562                         {
 563                                 unsigned short boguscount=200,rsst;
 564                                 printk(KERN_WARNING "%s: Retransmit timed out, status %04x, resetting...\n",
 565                                        dev->name, scb_status(dev));
 566                                 eexp_hw_txinit(dev);
 567                                 lp->last_tx_restart = 0;
 568                                 scb_wrcbl(dev, lp->tx_link);
 569                                 scb_command(dev, SCB_CUstart);
 570                                 outb(0,ioaddr+SIGNAL_CA);
 571                                 while (!SCB_complete(rsst=scb_status(dev)))
 572                                 {
 573                                         if (!--boguscount)
 574                                         {
 575                                                 boguscount=200;
 576                                                 printk(KERN_WARNING "%s: Reset timed out status %04x, retrying...\n",
 577                                                        dev->name,rsst);
 578                                                 scb_wrcbl(dev, lp->tx_link);
 579                                                 scb_command(dev, SCB_CUstart);
 580                                                 outb(0,ioaddr+SIGNAL_CA);
 581                                         }
 582                                 }
 583                                 netif_wake_queue(dev);
 584                         }
 585                         else
 586                         {
 587                                 unsigned short status = scb_status(dev);
 588                                 if (SCB_CUdead(status))
 589                                 {
 590                                         unsigned short txstatus = eexp_hw_lasttxstat(dev);
 591                                         printk(KERN_WARNING "%s: Transmit timed out, CU not active status %04x %04x, restarting...\n",
 592                                                dev->name, status, txstatus);
 593                                         eexp_hw_txrestart(dev);
 594                                 }
 595                                 else
 596                                 {
 597                                         unsigned short txstatus = eexp_hw_lasttxstat(dev);
 598                                         if (netif_queue_stopped(dev) && !txstatus)
 599                                         {
 600                                                 printk(KERN_WARNING "%s: CU wedged, status %04x %04x, resetting...\n",
 601                                                        dev->name,status,txstatus);
 602                                                 eexp_hw_init586(dev);
 603                                                 netif_wake_queue(dev);
 604                                         }
 605                                         else
 606                                         {
 607                                                 printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
 608                                         }
 609                                 }
 610                         }
 611                 }
 612         }
 613         else
 614         {
 615                 if ((jiffies-lp->init_time)>10)
 616                 {
 617                         unsigned short status = scb_status(dev);
 618                         printk(KERN_WARNING "%s: i82586 startup timed out, status %04x, resetting...\n",
 619                                dev->name, status);
 620                         eexp_hw_init586(dev);
 621                         netif_wake_queue(dev);
 622                 }
 623         }
 624 }
 625
 626 static void eexp_timeout(struct net_device *dev)
 627 {
 628         struct net_local *lp = netdev_priv(dev);
 629 #ifdef CONFIG_SMP
 630         unsigned long flags;
 631 #endif
 632         int status;
 633
 634         disable_irq(dev->irq);
 635
 636         /*
 637          *      Best would be to use synchronize_irq(); spin_lock() here
 638          *      lets make it work first..
 639          */
 640
 641 #ifdef CONFIG_SMP
 642         spin_lock_irqsave(&lp->lock, flags);
 643 #endif
 644
 645         status = scb_status(dev);
 646         unstick_cu(dev);
 647         printk(KERN_INFO "%s: transmit timed out, %s?\n", dev->name,
 648                (SCB_complete(status)?"lost interrupt":
 649                 "board on fire"));
 650         lp->stats.tx_errors++;
 651         lp->last_tx = jiffies;
 652         if (!SCB_complete(status)) {
 653                 scb_command(dev, SCB_CUabort);
 654                 outb(0,dev->base_addr+SIGNAL_CA);
 655         }
 656         netif_wake_queue(dev);
 657 #ifdef CONFIG_SMP
 658         spin_unlock_irqrestore(&lp->lock, flags);
 659 #endif
 660 }
 661
 662 /*
 663  * Called to transmit a packet, or to allow us to right ourselves
 664  * if the kernel thinks we've died.
 665  */
 666 static int eexp_xmit(struct sk_buff *buf, struct net_device *dev)
 667 {
 668         struct net_local *lp = netdev_priv(dev);
 669         short length = buf->len;
 670 #ifdef CONFIG_SMP
 671         unsigned long flags;
 672 #endif
 673
 674 #if NET_DEBUG > 6
 675         printk(KERN_DEBUG "%s: eexp_xmit()\n", dev->name);
 676 #endif
 677
 678         if (buf->len < ETH_ZLEN) {
 679                 if (skb_padto(buf, ETH_ZLEN))
 680                         return 0;
 681                 length = ETH_ZLEN;
 682         }
 683
 684         disable_irq(dev->irq);
 685
 686         /*
 687          *      Best would be to use synchronize_irq(); spin_lock() here
 688          *      lets make it work first..
 689          */
 690
 691 #ifdef CONFIG_SMP
 692         spin_lock_irqsave(&lp->lock, flags);
 693 #endif
 694
 695         {
 696                 unsigned short *data = (unsigned short *)buf->data;
 697
 698                 lp->stats.tx_bytes += length;
 699
 700                 eexp_hw_tx_pio(dev,data,length);
 701         }
 702         dev_kfree_skb(buf);
 703 #ifdef CONFIG_SMP
 704         spin_unlock_irqrestore(&lp->lock, flags);
 705 #endif
 706         enable_irq(dev->irq);
 707         return 0;
 708 }
 709
 710 /*
 711  * Handle an EtherExpress interrupt
 712  * If we've finished initializing, start the RU and CU up.
 713  * If we've already started, reap tx buffers, handle any received packets,
 714  * check to make sure we've not become wedged.
 715  */
 716
 717 /*
 718  * Handle an EtherExpress interrupt
 719  * If we've finished initializing, start the RU and CU up.
 720  * If we've already started, reap tx buffers, handle any received packets,
 721  * check to make sure we've not become wedged.
 722  */
 723
 724 static unsigned short eexp_start_irq(struct net_device *dev,
 725                                      unsigned short status)
 726 {
 727         unsigned short ack_cmd = SCB_ack(status);
 728         struct net_local *lp = netdev_priv(dev);
 729         unsigned short ioaddr = dev->base_addr;
 730         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_CU)) {
 731                 short diag_status, tdr_status;
 732                 while (SCB_CUstat(status)==2)
 733                         status = scb_status(dev);
 734 #if NET_DEBUG > 4
 735                 printk("%s: CU went non-active (status %04x)\n",
 736                        dev->name, status);
 737 #endif
 738
 739                 outw(CONF_DIAG_RESULT & ~31, ioaddr + SM_PTR);
 740                 diag_status = inw(ioaddr + SHADOW(CONF_DIAG_RESULT));
 741                 if (diag_status & 1<<11) {
 742                         printk(KERN_WARNING "%s: 82586 failed self-test\n",
 743                                dev->name);
 744                 } else if (!(diag_status & 1<<13)) {
 745                         printk(KERN_WARNING "%s: 82586 self-test failed to complete\n", dev->name);
 746                 }
 747
 748                 outw(CONF_TDR_RESULT & ~31, ioaddr + SM_PTR);
 749                 tdr_status = inw(ioaddr + SHADOW(CONF_TDR_RESULT));
 750                 if (tdr_status & (TDR_SHORT|TDR_OPEN)) {
 751                         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" : "");
 752                 }
 753                 else if (tdr_status & TDR_XCVRPROBLEM) {
 754                         printk(KERN_WARNING "%s: TDR reports transceiver problem\n", dev->name);
 755                 }
 756                 else if (tdr_status & TDR_LINKOK) {
 757 #if NET_DEBUG > 4
 758                         printk(KERN_DEBUG "%s: TDR reports link OK\n", dev->name);
 759 #endif
 760                 } else {
 761                         printk("%s: TDR is ga-ga (status %04x)\n", dev->name,
 762                                tdr_status);
 763                 }
 764
 765                 lp->started |= STARTED_CU;
 766                 scb_wrcbl(dev, lp->tx_link);
 767                 /* if the RU isn't running, start it now */
 768                 if (!(lp->started & STARTED_RU)) {
 769                         ack_cmd |= SCB_RUstart;
 770                         scb_wrrfa(dev, lp->rx_buf_start);
 771                         lp->rx_ptr = lp->rx_buf_start;
 772                         lp->started |= STARTED_RU;
 773                 }
 774                 ack_cmd |= SCB_CUstart | 0x2000;
 775         }
 776
 777         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_RU) && SCB_RUstat(status)==4)
 778                 lp->started|=STARTED_RU;
 779
 780         return ack_cmd;
 781 }
 782
 783 static void eexp_cmd_clear(struct net_device *dev)
 784 {
 785         unsigned long int oldtime = jiffies;
 786         while (scb_rdcmd(dev) && ((jiffies-oldtime)<10));
 787         if (scb_rdcmd(dev)) {
 788                 printk("%s: command didn't clear\n", dev->name);
 789         }
 790 }
 791
 792 static irqreturn_t eexp_irq(int irq, void *dev_info, struct pt_regs *regs)
 793 {
 794         struct net_device *dev = dev_info;
 795         struct net_local *lp;
 796         unsigned short ioaddr,status,ack_cmd;
 797         unsigned short old_read_ptr, old_write_ptr;
 798
 799         if (dev==NULL)
 800         {
 801                 printk(KERN_WARNING "eexpress: irq %d for unknown device\n",
 802                        irq);
 803                 return IRQ_NONE;
 804         }
 805
 806         lp = netdev_priv(dev);
 807         ioaddr = dev->base_addr;
 808
 809         spin_lock(&lp->lock);
 810
 811         old_read_ptr = inw(ioaddr+READ_PTR);
 812         old_write_ptr = inw(ioaddr+WRITE_PTR);
 813
 814         outb(SIRQ_dis|irqrmap[irq],ioaddr+SET_IRQ);
 815
 816
 817         status = scb_status(dev);
 818
 819 #if NET_DEBUG > 4
 820         printk(KERN_DEBUG "%s: interrupt (status %x)\n", dev->name, status);
 821 #endif
 822
 823         if (lp->started == (STARTED_CU | STARTED_RU)) {
 824
 825                 do {
 826                         eexp_cmd_clear(dev);
 827
 828                         ack_cmd = SCB_ack(status);
 829                         scb_command(dev, ack_cmd);
 830                         outb(0,ioaddr+SIGNAL_CA);
 831
 832                         eexp_cmd_clear(dev);
 833
 834                         if (SCB_complete(status)) {
 835                                 if (!eexp_hw_lasttxstat(dev)) {
 836                                         printk("%s: tx interrupt but no status\n", dev->name);
 837                                 }
 838                         }
 839
 840                         if (SCB_rxdframe(status))
 841                                 eexp_hw_rx_pio(dev);
 842
 843                         status = scb_status(dev);
 844                 } while (status & 0xc000);
 845
 846                 if (SCB_RUdead(status))
 847                 {
 848                         printk(KERN_WARNING "%s: RU stopped: status %04x\n",
 849                                dev->name,status);
 850 #if 0
 851                         printk(KERN_WARNING "%s: cur_rfd=%04x, cur_rbd=%04x\n", dev->name, lp->cur_rfd, lp->cur_rbd);
 852                         outw(lp->cur_rfd, ioaddr+READ_PTR);
 853                         printk(KERN_WARNING "%s: [%04x]\n", dev->name, inw(ioaddr+DATAPORT));
 854                         outw(lp->cur_rfd+6, ioaddr+READ_PTR);
 855                         printk(KERN_WARNING "%s: rbd is %04x\n", dev->name, rbd= inw(ioaddr+DATAPORT));
 856                         outw(rbd, ioaddr+READ_PTR);
 857                         printk(KERN_WARNING "%s: [%04x %04x] ", dev->name, inw(ioaddr+DATAPORT), inw(ioaddr+DATAPORT));
 858                         outw(rbd+8, ioaddr+READ_PTR);
 859                         printk("[%04x]\n", inw(ioaddr+DATAPORT));
 860 #endif
 861                         lp->stats.rx_errors++;
 862 #if 1
 863                         eexp_hw_rxinit(dev);
 864 #else
 865                         lp->cur_rfd = lp->first_rfd;
 866 #endif
 867                         scb_wrrfa(dev, lp->rx_buf_start);
 868                         scb_command(dev, SCB_RUstart);
 869                         outb(0,ioaddr+SIGNAL_CA);
 870                 }
 871         } else {
 872                 if (status & 0x8000)
 873                         ack_cmd = eexp_start_irq(dev, status);
 874                 else
 875                         ack_cmd = SCB_ack(status);
 876                 scb_command(dev, ack_cmd);
 877                 outb(0,ioaddr+SIGNAL_CA);
 878         }
 879
 880         eexp_cmd_clear(dev);
 881
 882         outb(SIRQ_en|irqrmap[irq],ioaddr+SET_IRQ);
 883
 884 #if NET_DEBUG > 6
 885         printk("%s: leaving eexp_irq()\n", dev->name);
 886 #endif
 887         outw(old_read_ptr, ioaddr+READ_PTR);
 888         outw(old_write_ptr, ioaddr+WRITE_PTR);
 889
 890         spin_unlock(&lp->lock);
 891         return IRQ_HANDLED;
 892 }
 893
 894 /*
 895  * Hardware access functions
 896  */
 897
 898 /*
 899  * Set the cable type to use.
 900  */
 901
 902 static void eexp_hw_set_interface(struct net_device *dev)
 903 {
 904         unsigned char oldval = inb(dev->base_addr + 0x300e);
 905         oldval &= ~0x82;
 906         switch (dev->if_port) {
 907         case TPE:
 908                 oldval |= 0x2;
 909         case BNC:
 910                 oldval |= 0x80;
 911                 break;
 912         }
 913         outb(oldval, dev->base_addr+0x300e);
 914         mdelay(20);
 915 }
 916
 917 /*
 918  * Check all the receive buffers, and hand any received packets
 919  * to the upper levels. Basic sanity check on each frame
 920  * descriptor, though we don't bother trying to fix broken ones.
 921  */
 922
 923 static void eexp_hw_rx_pio(struct net_device *dev)
 924 {
 925         struct net_local *lp = netdev_priv(dev);
 926         unsigned short rx_block = lp->rx_ptr;
 927         unsigned short boguscount = lp->num_rx_bufs;
 928         unsigned short ioaddr = dev->base_addr;
 929         unsigned short status;
 930
 931 #if NET_DEBUG > 6
 932         printk(KERN_DEBUG "%s: eexp_hw_rx()\n", dev->name);
 933 #endif
 934
 935         do {
 936                 unsigned short rfd_cmd, rx_next, pbuf, pkt_len;
 937
 938                 outw(rx_block, ioaddr + READ_PTR);
 939                 status = inw(ioaddr + DATAPORT);
 940
 941                 if (FD_Done(status))
 942                 {
 943                         rfd_cmd = inw(ioaddr + DATAPORT);
 944                         rx_next = inw(ioaddr + DATAPORT);
 945                         pbuf = inw(ioaddr + DATAPORT);
 946
 947                         outw(pbuf, ioaddr + READ_PTR);
 948                         pkt_len = inw(ioaddr + DATAPORT);
 949
 950                         if (rfd_cmd!=0x0000)
 951                         {
 952                                 printk(KERN_WARNING "%s: rfd_cmd not zero:0x%04x\n",
 953                                        dev->name, rfd_cmd);
 954                                 continue;
 955                         }
 956                         else if (pbuf!=rx_block+0x16)
 957                         {
 958                                 printk(KERN_WARNING "%s: rfd and rbd out of sync 0x%04x 0x%04x\n",
 959                                        dev->name, rx_block+0x16, pbuf);
 960                                 continue;
 961                         }
 962                         else if ((pkt_len & 0xc000)!=0xc000)
 963                         {
 964                                 printk(KERN_WARNING "%s: EOF or F not set on received buffer (%04x)\n",
 965                                        dev->name, pkt_len & 0xc000);
 966                                 continue;
 967                         }
 968                         else if (!FD_OK(status))
 969                         {
 970                                 lp->stats.rx_errors++;
 971                                 if (FD_CRC(status))
 972                                         lp->stats.rx_crc_errors++;
 973                                 if (FD_Align(status))
 974                                         lp->stats.rx_frame_errors++;
 975                                 if (FD_Resrc(status))
 976                                         lp->stats.rx_fifo_errors++;
 977                                 if (FD_DMA(status))
 978                                         lp->stats.rx_over_errors++;
 979                                 if (FD_Short(status))
 980                                         lp->stats.rx_length_errors++;
 981                         }
 982                         else
 983                         {
 984                                 struct sk_buff *skb;
 985                                 pkt_len &= 0x3fff;
 986                                 skb = dev_alloc_skb(pkt_len+16);
 987                                 if (skb == NULL)
 988                                 {
 989                                         printk(KERN_WARNING "%s: Memory squeeze, dropping packet\n",dev->name);
 990                                         lp->stats.rx_dropped++;
 991                                         break;
 992                                 }
 993                                 skb->dev = dev;
 994                                 skb_reserve(skb, 2);
 995                                 outw(pbuf+10, ioaddr+READ_PTR);
 996                                 insw(ioaddr+DATAPORT, skb_put(skb,pkt_len),(pkt_len+1)>>1);
 997                                 skb->protocol = eth_type_trans(skb,dev);
 998                                 netif_rx(skb);
 999                                 dev->last_rx = jiffies;
1000                                 lp->stats.rx_packets++;
1001                                 lp->stats.rx_bytes += pkt_len;
1002                         }
1003                         outw(rx_block, ioaddr+WRITE_PTR);
1004                         outw(0, ioaddr+DATAPORT);
1005                         outw(0, ioaddr+DATAPORT);
1006                         rx_block = rx_next;
1007                 }
1008         } while (FD_Done(status) && boguscount--);
1009         lp->rx_ptr = rx_block;
1010 }
1011
1012 /*
1013  * Hand a packet to the card for transmission
1014  * If we get here, we MUST have already checked
1015  * to make sure there is room in the transmit
1016  * buffer region.
1017  */
1018
1019 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
1020                        unsigned short len)
1021 {
1022         struct net_local *lp = netdev_priv(dev);
1023         unsigned short ioaddr = dev->base_addr;
1024
1025         if (LOCKUP16 || lp->width) {
1026                 /* Stop the CU so that there is no chance that it
1027                    jumps off to a bogus address while we are writing the
1028                    pointer to the next transmit packet in 8-bit mode --
1029                    this eliminates the "CU wedged" errors in 8-bit mode.
1030                    (Zoltan Szilagyi 10-12-96) */
1031                 scb_command(dev, SCB_CUsuspend);
1032                 outw(0xFFFF, ioaddr+SIGNAL_CA);
1033         }
1034
1035         outw(lp->tx_head, ioaddr + WRITE_PTR);
1036
1037         outw(0x0000, ioaddr + DATAPORT);
1038         outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1039         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
1040         outw(lp->tx_head+0x0e, ioaddr + DATAPORT);
1041
1042         outw(0x0000, ioaddr + DATAPORT);
1043         outw(0x0000, ioaddr + DATAPORT);
1044         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
1045
1046         outw(0x8000|len, ioaddr + DATAPORT);
1047         outw(-1, ioaddr + DATAPORT);
1048         outw(lp->tx_head+0x16, ioaddr + DATAPORT);
1049         outw(0, ioaddr + DATAPORT);
1050
1051         outsw(ioaddr + DATAPORT, buf, (len+1)>>1);
1052
1053         outw(lp->tx_tail+0xc, ioaddr + WRITE_PTR);
1054         outw(lp->tx_head, ioaddr + DATAPORT);
1055
1056         dev->trans_start = jiffies;
1057         lp->tx_tail = lp->tx_head;
1058         if (lp->tx_head==TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1059                 lp->tx_head = TX_BUF_START;
1060         else
1061                 lp->tx_head += TX_BUF_SIZE;
1062         if (lp->tx_head != lp->tx_reap)
1063                 netif_wake_queue(dev);
1064
1065         if (LOCKUP16 || lp->width) {
1066                 /* Restart the CU so that the packet can actually
1067                    be transmitted. (Zoltan Szilagyi 10-12-96) */
1068                 scb_command(dev, SCB_CUresume);
1069                 outw(0xFFFF, ioaddr+SIGNAL_CA);
1070         }
1071
1072         lp->stats.tx_packets++;
1073         lp->last_tx = jiffies;
1074 }
1075
1076 /*
1077  * Sanity check the suspected EtherExpress card
1078  * Read hardware address, reset card, size memory and initialize buffer
1079  * memory pointers. These are held in dev->priv, in case someone has more
1080  * than one card in a machine.
1081  */
1082
1083 static int __init eexp_hw_probe(struct net_device *dev, unsigned short ioaddr)
1084 {
1085         unsigned short hw_addr[3];
1086         unsigned char buswidth;
1087         unsigned int memory_size;
1088         int i;
1089         unsigned short xsum = 0;
1090         struct net_local *lp = netdev_priv(dev);
1091
1092         printk("%s: EtherExpress 16 at %#x ",dev->name,ioaddr);
1093
1094         outb(ASIC_RST, ioaddr+EEPROM_Ctrl);
1095         outb(0, ioaddr+EEPROM_Ctrl);
1096         udelay(500);
1097         outb(i586_RST, ioaddr+EEPROM_Ctrl);
1098
1099         hw_addr[0] = eexp_hw_readeeprom(ioaddr,2);
1100         hw_addr[1] = eexp_hw_readeeprom(ioaddr,3);
1101         hw_addr[2] = eexp_hw_readeeprom(ioaddr,4);
1102
1103         /* Standard Address or Compaq LTE Address */
1104         if (!((hw_addr[2]==0x00aa && ((hw_addr[1] & 0xff00)==0x0000)) ||
1105               (hw_addr[2]==0x0080 && ((hw_addr[1] & 0xff00)==0x5F00))))
1106         {
1107                 printk(" rejected: invalid address %04x%04x%04x\n",
1108                         hw_addr[2],hw_addr[1],hw_addr[0]);
1109                 return -ENODEV;
1110         }
1111
1112         /* Calculate the EEPROM checksum.  Carry on anyway if it's bad,
1113          * though.
1114          */
1115         for (i = 0; i < 64; i++)
1116                 xsum += eexp_hw_readeeprom(ioaddr, i);
1117         if (xsum != 0xbaba)
1118                 printk(" (bad EEPROM xsum 0x%02x)", xsum);
1119
1120         dev->base_addr = ioaddr;
1121         for ( i=0 ; i<6 ; i++ )
1122                 dev->dev_addr[i] = ((unsigned char *)hw_addr)[5-i];
1123
1124         {
1125                 static char irqmap[]={0, 9, 3, 4, 5, 10, 11, 0};
1126                 unsigned short setupval = eexp_hw_readeeprom(ioaddr,0);
1127
1128                 /* Use the IRQ from EEPROM if none was given */
1129                 if (!dev->irq)
1130                         dev->irq = irqmap[setupval>>13];
1131
1132                 if (dev->if_port == 0xff) {
1133                         dev->if_port = !(setupval & 0x1000) ? AUI :
1134                                 eexp_hw_readeeprom(ioaddr,5) & 0x1 ? TPE : BNC;
1135                 }
1136
1137                 buswidth = !((setupval & 0x400) >> 10);
1138         }
1139
1140         memset(lp, 0, sizeof(struct net_local));
1141         spin_lock_init(&lp->lock);
1142
1143         printk("(IRQ %d, %s connector, %d-bit bus", dev->irq,
1144                eexp_ifmap[dev->if_port], buswidth?8:16);
1145
1146         if (!request_region(dev->base_addr + 0x300e, 1, "EtherExpress"))
1147                 return -EBUSY;
1148
1149         eexp_hw_set_interface(dev);
1150
1151         release_region(dev->base_addr + 0x300e, 1);
1152
1153         /* Find out how much RAM we have on the card */
1154         outw(0, dev->base_addr + WRITE_PTR);
1155         for (i = 0; i < 32768; i++)
1156                 outw(0, dev->base_addr + DATAPORT);
1157
1158         for (memory_size = 0; memory_size < 64; memory_size++)
1159         {
1160                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1161                 if (inw(dev->base_addr+DATAPORT))
1162                         break;
1163                 outw(memory_size<<10, dev->base_addr + WRITE_PTR);
1164                 outw(memory_size | 0x5000, dev->base_addr+DATAPORT);
1165                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1166                 if (inw(dev->base_addr+DATAPORT) != (memory_size | 0x5000))
1167                         break;
1168         }
1169
1170         /* Sort out the number of buffers.  We may have 16, 32, 48 or 64k
1171          * of RAM to play with.
1172          */
1173         lp->num_tx_bufs = 4;
1174         lp->rx_buf_end = 0x3ff6;
1175         switch (memory_size)
1176         {
1177         case 64:
1178                 lp->rx_buf_end += 0x4000;
1179         case 48:
1180                 lp->num_tx_bufs += 4;
1181                 lp->rx_buf_end += 0x4000;
1182         case 32:
1183                 lp->rx_buf_end += 0x4000;
1184         case 16:
1185                 printk(", %dk RAM)\n", memory_size);
1186                 break;
1187         default:
1188                 printk(") bad memory size (%dk).\n", memory_size);
1189                 return -ENODEV;
1190                 break;
1191         }
1192
1193         lp->rx_buf_start = TX_BUF_START + (lp->num_tx_bufs*TX_BUF_SIZE);
1194         lp->width = buswidth;
1195
1196         dev->open = eexp_open;
1197         dev->stop = eexp_close;
1198         dev->hard_start_xmit = eexp_xmit;
1199         dev->get_stats = eexp_stats;
1200         dev->set_multicast_list = &eexp_set_multicast;
1201         dev->tx_timeout = eexp_timeout;
1202         dev->watchdog_timeo = 2*HZ;
1203
1204         return register_netdev(dev);
1205 }
1206
1207 /*
1208  * Read a word from the EtherExpress on-board serial EEPROM.
1209  * The EEPROM contains 64 words of 16 bits.
1210  */
1211 static unsigned short __init eexp_hw_readeeprom(unsigned short ioaddr,
1212                                                     unsigned char location)
1213 {
1214         unsigned short cmd = 0x180|(location&0x7f);
1215         unsigned short rval = 0,wval = EC_CS|i586_RST;
1216         int i;
1217
1218         outb(EC_CS|i586_RST,ioaddr+EEPROM_Ctrl);
1219         for (i=0x100 ; i ; i>>=1 )
1220         {
1221                 if (cmd&i)
1222                         wval |= EC_Wr;
1223                 else
1224                         wval &= ~EC_Wr;
1225
1226                 outb(wval,ioaddr+EEPROM_Ctrl);
1227                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1228                 eeprom_delay();
1229                 outb(wval,ioaddr+EEPROM_Ctrl);
1230                 eeprom_delay();
1231         }
1232         wval &= ~EC_Wr;
1233         outb(wval,ioaddr+EEPROM_Ctrl);
1234         for (i=0x8000 ; i ; i>>=1 )
1235         {
1236                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1237                 eeprom_delay();
1238                 if (inb(ioaddr+EEPROM_Ctrl)&EC_Rd)
1239                         rval |= i;
1240                 outb(wval,ioaddr+EEPROM_Ctrl);
1241                 eeprom_delay();
1242         }
1243         wval &= ~EC_CS;
1244         outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1245         eeprom_delay();
1246         outb(wval,ioaddr+EEPROM_Ctrl);
1247         eeprom_delay();
1248         return rval;
1249 }
1250
1251 /*
1252  * Reap tx buffers and return last transmit status.
1253  * if ==0 then either:
1254  *    a) we're not transmitting anything, so why are we here?
1255  *    b) we've died.
1256  * otherwise, Stat_Busy(return) means we've still got some packets
1257  * to transmit, Stat_Done(return) means our buffers should be empty
1258  * again
1259  */
1260
1261 static unsigned short eexp_hw_lasttxstat(struct net_device *dev)
1262 {
1263         struct net_local *lp = netdev_priv(dev);
1264         unsigned short tx_block = lp->tx_reap;
1265         unsigned short status;
1266
1267         if (!netif_queue_stopped(dev) && lp->tx_head==lp->tx_reap)
1268                 return 0x0000;
1269
1270         do
1271         {
1272                 outw(tx_block & ~31, dev->base_addr + SM_PTR);
1273                 status = inw(dev->base_addr + SHADOW(tx_block));
1274                 if (!Stat_Done(status))
1275                 {
1276                         lp->tx_link = tx_block;
1277                         return status;
1278                 }
1279                 else
1280                 {
1281                         lp->last_tx_restart = 0;
1282                         lp->stats.collisions += Stat_NoColl(status);
1283                         if (!Stat_OK(status))
1284                         {
1285                                 char *whatsup = NULL;
1286                                 lp->stats.tx_errors++;
1287                                 if (Stat_Abort(status))
1288                                         lp->stats.tx_aborted_errors++;
1289                                 if (Stat_TNoCar(status)) {
1290                                         whatsup = "aborted, no carrier";
1291                                         lp->stats.tx_carrier_errors++;
1292                                 }
1293                                 if (Stat_TNoCTS(status)) {
1294                                         whatsup = "aborted, lost CTS";
1295                                         lp->stats.tx_carrier_errors++;
1296                                 }
1297                                 if (Stat_TNoDMA(status)) {
1298                                         whatsup = "FIFO underran";
1299                                         lp->stats.tx_fifo_errors++;
1300                                 }
1301                                 if (Stat_TXColl(status)) {
1302                                         whatsup = "aborted, too many collisions";
1303                                         lp->stats.tx_aborted_errors++;
1304                                 }
1305                                 if (whatsup)
1306                                         printk(KERN_INFO "%s: transmit %s\n",
1307                                                dev->name, whatsup);
1308                         }
1309                         else
1310                                 lp->stats.tx_packets++;
1311                 }
1312                 if (tx_block == TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1313                         lp->tx_reap = tx_block = TX_BUF_START;
1314                 else
1315                         lp->tx_reap = tx_block += TX_BUF_SIZE;
1316                 netif_wake_queue(dev);
1317         }
1318         while (lp->tx_reap != lp->tx_head);
1319
1320         lp->tx_link = lp->tx_tail + 0x08;
1321
1322         return status;
1323 }
1324
1325 /*
1326  * This should never happen. It is called when some higher routine detects
1327  * that the CU has stopped, to try to restart it from the last packet we knew
1328  * we were working on, or the idle loop if we had finished for the time.
1329  */
1330
1331 static void eexp_hw_txrestart(struct net_device *dev)
1332 {
1333         struct net_local *lp = netdev_priv(dev);
1334         unsigned short ioaddr = dev->base_addr;
1335
1336         lp->last_tx_restart = lp->tx_link;
1337         scb_wrcbl(dev, lp->tx_link);
1338         scb_command(dev, SCB_CUstart);
1339         outb(0,ioaddr+SIGNAL_CA);
1340
1341         {
1342                 unsigned short boguscount=50,failcount=5;
1343                 while (!scb_status(dev))
1344                 {
1345                         if (!--boguscount)
1346                         {
1347                                 if (--failcount)
1348                                 {
1349                                         printk(KERN_WARNING "%s: CU start timed out, status %04x, cmd %04x\n", dev->name, scb_status(dev), scb_rdcmd(dev));
1350                                         scb_wrcbl(dev, lp->tx_link);
1351                                         scb_command(dev, SCB_CUstart);
1352                                         outb(0,ioaddr+SIGNAL_CA);
1353                                         boguscount = 100;
1354                                 }
1355                                 else
1356                                 {
1357                                         printk(KERN_WARNING "%s: Failed to restart CU, resetting board...\n",dev->name);
1358                                         eexp_hw_init586(dev);
1359                                         netif_wake_queue(dev);
1360                                         return;
1361                                 }
1362                         }
1363                 }
1364         }
1365 }
1366
1367 /*
1368  * Writes down the list of transmit buffers into card memory.  Each
1369  * entry consists of an 82586 transmit command, followed by a jump
1370  * pointing to itself.  When we want to transmit a packet, we write
1371  * the data into the appropriate transmit buffer and then modify the
1372  * preceding jump to point at the new transmit command.  This means that
1373  * the 586 command unit is continuously active.
1374  */
1375
1376 static void eexp_hw_txinit(struct net_device *dev)
1377 {
1378         struct net_local *lp = netdev_priv(dev);
1379         unsigned short tx_block = TX_BUF_START;
1380         unsigned short curtbuf;
1381         unsigned short ioaddr = dev->base_addr;
1382
1383         for ( curtbuf=0 ; curtbuf<lp->num_tx_bufs ; curtbuf++ )
1384         {
1385                 outw(tx_block, ioaddr + WRITE_PTR);
1386
1387                 outw(0x0000, ioaddr + DATAPORT);
1388                 outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1389                 outw(tx_block+0x08, ioaddr + DATAPORT);
1390                 outw(tx_block+0x0e, ioaddr + DATAPORT);
1391
1392                 outw(0x0000, ioaddr + DATAPORT);
1393                 outw(0x0000, ioaddr + DATAPORT);
1394                 outw(tx_block+0x08, ioaddr + DATAPORT);
1395
1396                 outw(0x8000, ioaddr + DATAPORT);
1397                 outw(-1, ioaddr + DATAPORT);
1398                 outw(tx_block+0x16, ioaddr + DATAPORT);
1399                 outw(0x0000, ioaddr + DATAPORT);
1400
1401                 tx_block += TX_BUF_SIZE;
1402         }
1403         lp->tx_head = TX_BUF_START;
1404         lp->tx_reap = TX_BUF_START;
1405         lp->tx_tail = tx_block - TX_BUF_SIZE;
1406         lp->tx_link = lp->tx_tail + 0x08;
1407         lp->rx_buf_start = tx_block;
1408
1409 }
1410
1411 /*
1412  * Write the circular list of receive buffer descriptors to card memory.
1413  * The end of the list isn't marked, which means that the 82586 receive
1414  * unit will loop until buffers become available (this avoids it giving us
1415  * "out of resources" messages).
1416  */
1417
1418 static void eexp_hw_rxinit(struct net_device *dev)
1419 {
1420         struct net_local *lp = netdev_priv(dev);
1421         unsigned short rx_block = lp->rx_buf_start;
1422         unsigned short ioaddr = dev->base_addr;
1423
1424         lp->num_rx_bufs = 0;
1425         lp->rx_first = lp->rx_ptr = rx_block;
1426         do
1427         {
1428                 lp->num_rx_bufs++;
1429
1430                 outw(rx_block, ioaddr + WRITE_PTR);
1431
1432                 outw(0, ioaddr + DATAPORT);  outw(0, ioaddr+DATAPORT);
1433                 outw(rx_block + RX_BUF_SIZE, ioaddr+DATAPORT);
1434                 outw(0xffff, ioaddr+DATAPORT);
1435
1436                 outw(0x0000, ioaddr+DATAPORT);
1437                 outw(0xdead, ioaddr+DATAPORT);
1438                 outw(0xdead, ioaddr+DATAPORT);
1439                 outw(0xdead, ioaddr+DATAPORT);
1440                 outw(0xdead, ioaddr+DATAPORT);
1441                 outw(0xdead, ioaddr+DATAPORT);
1442                 outw(0xdead, ioaddr+DATAPORT);
1443
1444                 outw(0x0000, ioaddr+DATAPORT);
1445                 outw(rx_block + RX_BUF_SIZE + 0x16, ioaddr+DATAPORT);
1446                 outw(rx_block + 0x20, ioaddr+DATAPORT);
1447                 outw(0, ioaddr+DATAPORT);
1448                 outw(RX_BUF_SIZE-0x20, ioaddr+DATAPORT);
1449
1450                 lp->rx_last = rx_block;
1451                 rx_block += RX_BUF_SIZE;
1452         } while (rx_block <= lp->rx_buf_end-RX_BUF_SIZE);
1453
1454
1455         /* Make first Rx frame descriptor point to first Rx buffer
1456            descriptor */
1457         outw(lp->rx_first + 6, ioaddr+WRITE_PTR);
1458         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1459
1460         /* Close Rx frame descriptor ring */
1461         outw(lp->rx_last + 4, ioaddr+WRITE_PTR);
1462         outw(lp->rx_first, ioaddr+DATAPORT);
1463
1464         /* Close Rx buffer descriptor ring */
1465         outw(lp->rx_last + 0x16 + 2, ioaddr+WRITE_PTR);
1466         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1467
1468 }
1469
1470 /*
1471  * Un-reset the 586, and start the configuration sequence. We don't wait for
1472  * this to finish, but allow the interrupt handler to start the CU and RU for
1473  * us.  We can't start the receive/transmission system up before we know that
1474  * the hardware is configured correctly.
1475  */
1476
1477 static void eexp_hw_init586(struct net_device *dev)
1478 {
1479         struct net_local *lp = netdev_priv(dev);
1480         unsigned short ioaddr = dev->base_addr;
1481         int i;
1482
1483 #if NET_DEBUG > 6
1484         printk("%s: eexp_hw_init586()\n", dev->name);
1485 #endif
1486
1487         lp->started = 0;
1488
1489         set_loopback(dev);
1490
1491         outb(SIRQ_dis|irqrmap[dev->irq],ioaddr+SET_IRQ);
1492
1493         /* Download the startup code */
1494         outw(lp->rx_buf_end & ~31, ioaddr + SM_PTR);
1495         outw(lp->width?0x0001:0x0000, ioaddr + 0x8006);
1496         outw(0x0000, ioaddr + 0x8008);
1497         outw(0x0000, ioaddr + 0x800a);
1498         outw(0x0000, ioaddr + 0x800c);
1499         outw(0x0000, ioaddr + 0x800e);
1500
1501         for (i = 0; i < (sizeof(start_code)); i+=32) {
1502                 int j;
1503                 outw(i, ioaddr + SM_PTR);
1504                 for (j = 0; j < 16; j+=2)
1505                         outw(start_code[(i+j)/2],
1506                              ioaddr+0x4000+j);
1507                 for (j = 0; j < 16; j+=2)
1508                         outw(start_code[(i+j+16)/2],
1509                              ioaddr+0x8000+j);
1510         }
1511
1512         /* Do we want promiscuous mode or multicast? */
1513         outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1514         i = inw(ioaddr+SHADOW(CONF_PROMISC));
1515         outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1516              ioaddr+SHADOW(CONF_PROMISC));
1517         lp->was_promisc = dev->flags & IFF_PROMISC;
1518 #if 0
1519         eexp_setup_filter(dev);
1520 #endif
1521
1522         /* Write our hardware address */
1523         outw(CONF_HWADDR & ~31, ioaddr+SM_PTR);
1524         outw(((unsigned short *)dev->dev_addr)[0], ioaddr+SHADOW(CONF_HWADDR));
1525         outw(((unsigned short *)dev->dev_addr)[1],
1526              ioaddr+SHADOW(CONF_HWADDR+2));
1527         outw(((unsigned short *)dev->dev_addr)[2],
1528              ioaddr+SHADOW(CONF_HWADDR+4));
1529
1530         eexp_hw_txinit(dev);
1531         eexp_hw_rxinit(dev);
1532
1533         outb(0,ioaddr+EEPROM_Ctrl);
1534         mdelay(5);
1535
1536         scb_command(dev, 0xf000);
1537         outb(0,ioaddr+SIGNAL_CA);
1538
1539         outw(0, ioaddr+SM_PTR);
1540
1541         {
1542                 unsigned short rboguscount=50,rfailcount=5;
1543                 while (inw(ioaddr+0x4000))
1544                 {
1545                         if (!--rboguscount)
1546                         {
1547                                 printk(KERN_WARNING "%s: i82586 reset timed out, kicking...\n",
1548                                         dev->name);
1549                                 scb_command(dev, 0);
1550                                 outb(0,ioaddr+SIGNAL_CA);
1551                                 rboguscount = 100;
1552                                 if (!--rfailcount)
1553                                 {
1554                                         printk(KERN_WARNING "%s: i82586 not responding, giving up.\n",
1555                                                 dev->name);
1556                                         return;
1557                                 }
1558                         }
1559                 }
1560         }
1561
1562         scb_wrcbl(dev, CONF_LINK);
1563         scb_command(dev, 0xf000|SCB_CUstart);
1564         outb(0,ioaddr+SIGNAL_CA);
1565
1566         {
1567                 unsigned short iboguscount=50,ifailcount=5;
1568                 while (!scb_status(dev))
1569                 {
1570                         if (!--iboguscount)
1571                         {
1572                                 if (--ifailcount)
1573                                 {
1574                                         printk(KERN_WARNING "%s: i82586 initialization timed out, status %04x, cmd %04x\n",
1575                                                 dev->name, scb_status(dev), scb_rdcmd(dev));
1576                                         scb_wrcbl(dev, CONF_LINK);
1577                                         scb_command(dev, 0xf000|SCB_CUstart);
1578                                         outb(0,ioaddr+SIGNAL_CA);
1579                                         iboguscount = 100;
1580                                 }
1581                                 else
1582                                 {
1583                                         printk(KERN_WARNING "%s: Failed to initialize i82586, giving up.\n",dev->name);
1584                                         return;
1585                                 }
1586                         }
1587                 }
1588         }
1589
1590         clear_loopback(dev);
1591         outb(SIRQ_en|irqrmap[dev->irq],ioaddr+SET_IRQ);
1592
1593         lp->init_time = jiffies;
1594 #if NET_DEBUG > 6
1595         printk("%s: leaving eexp_hw_init586()\n", dev->name);
1596 #endif
1597         return;
1598 }
1599
1600 static void eexp_setup_filter(struct net_device *dev)
1601 {
1602         struct dev_mc_list *dmi = dev->mc_list;
1603         unsigned short ioaddr = dev->base_addr;
1604         int count = dev->mc_count;
1605         int i;
1606         if (count > 8) {
1607                 printk(KERN_INFO "%s: too many multicast addresses (%d)\n",
1608                        dev->name, count);
1609                 count = 8;
1610         }
1611
1612         outw(CONF_NR_MULTICAST & ~31, ioaddr+SM_PTR);
1613         outw(count, ioaddr+SHADOW(CONF_NR_MULTICAST));
1614         for (i = 0; i < count; i++) {
1615                 unsigned short *data = (unsigned short *)dmi->dmi_addr;
1616                 if (!dmi) {
1617                         printk(KERN_INFO "%s: too few multicast addresses\n", dev->name);
1618                         break;
1619                 }
1620                 if (dmi->dmi_addrlen != ETH_ALEN) {
1621                         printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
1622                         continue;
1623                 }
1624                 outw((CONF_MULTICAST+(6*i)) & ~31, ioaddr+SM_PTR);
1625                 outw(data[0], ioaddr+SHADOW(CONF_MULTICAST+(6*i)));
1626                 outw((CONF_MULTICAST+(6*i)+2) & ~31, ioaddr+SM_PTR);
1627                 outw(data[1], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+2));
1628                 outw((CONF_MULTICAST+(6*i)+4) & ~31, ioaddr+SM_PTR);
1629                 outw(data[2], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+4));
1630         }
1631 }
1632
1633 /*
1634  * Set or clear the multicast filter for this adaptor.
1635  */
1636 static void
1637 eexp_set_multicast(struct net_device *dev)
1638 {
1639         unsigned short ioaddr = dev->base_addr;
1640         struct net_local *lp = netdev_priv(dev);
1641         int kick = 0, i;
1642         if ((dev->flags & IFF_PROMISC) != lp->was_promisc) {
1643                 outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1644                 i = inw(ioaddr+SHADOW(CONF_PROMISC));
1645                 outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1646                      ioaddr+SHADOW(CONF_PROMISC));
1647                 lp->was_promisc = dev->flags & IFF_PROMISC;
1648                 kick = 1;
1649         }
1650         if (!(dev->flags & IFF_PROMISC)) {
1651                 eexp_setup_filter(dev);
1652                 if (lp->old_mc_count != dev->mc_count) {
1653                         kick = 1;
1654                         lp->old_mc_count = dev->mc_count;
1655                 }
1656         }
1657         if (kick) {
1658                 unsigned long oj;
1659                 scb_command(dev, SCB_CUsuspend);
1660                 outb(0, ioaddr+SIGNAL_CA);
1661                 outb(0, ioaddr+SIGNAL_CA);
1662 #if 0
1663                 printk("%s: waiting for CU to go suspended\n", dev->name);
1664 #endif
1665                 oj = jiffies;
1666                 while ((SCB_CUstat(scb_status(dev)) == 2) &&
1667                        ((jiffies-oj) < 2000));
1668                 if (SCB_CUstat(scb_status(dev)) == 2)
1669                         printk("%s: warning, CU didn't stop\n", dev->name);
1670                 lp->started &= ~(STARTED_CU);
1671                 scb_wrcbl(dev, CONF_LINK);
1672                 scb_command(dev, SCB_CUstart);
1673                 outb(0, ioaddr+SIGNAL_CA);
1674         }
1675 }
1676
1677
1678 /*
1679  * MODULE stuff
1680  */
1681
1682 #ifdef MODULE
1683
1684 #define EEXP_MAX_CARDS     4    /* max number of cards to support */
1685
1686 static struct net_device *dev_eexp[EEXP_MAX_CARDS];
1687 static int irq[EEXP_MAX_CARDS];
1688 static int io[EEXP_MAX_CARDS];
1689
1690 module_param_array(io, int, NULL, 0);
1691 module_param_array(irq, int, NULL, 0);
1692 MODULE_PARM_DESC(io, "EtherExpress 16 I/O base address(es)");
1693 MODULE_PARM_DESC(irq, "EtherExpress 16 IRQ number(s)");
1694 MODULE_LICENSE("GPL");
1695
1696
1697 /* Ideally the user would give us io=, irq= for every card.  If any parameters
1698  * are specified, we verify and then use them.  If no parameters are given, we
1699  * autoprobe for one card only.
1700  */
1701 int __init init_module(void)
1702 {
1703         struct net_device *dev;
1704         int this_dev, found = 0;
1705
1706         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1707                 dev = alloc_etherdev(sizeof(struct net_local));
1708                 dev->irq = irq[this_dev];
1709                 dev->base_addr = io[this_dev];
1710                 if (io[this_dev] == 0) {
1711                         if (this_dev)
1712                                 break;
1713                         printk(KERN_NOTICE "eexpress.c: Module autoprobe not recommended, give io=xx.\n");
1714                 }
1715                 if (do_express_probe(dev) == 0) {
1716                         dev_eexp[this_dev] = dev;
1717                         found++;
1718                         continue;
1719                 }
1720                 printk(KERN_WARNING "eexpress.c: Failed to register card at 0x%x.\n", io[this_dev]);
1721                 free_netdev(dev);
1722                 break;
1723         }
1724         if (found)
1725                 return 0;
1726         return -ENXIO;
1727 }
1728
1729 void cleanup_module(void)
1730 {
1731         int this_dev;
1732
1733         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1734                 struct net_device *dev = dev_eexp[this_dev];
1735                 if (dev) {
1736                         unregister_netdev(dev);
1737                         free_netdev(dev);
1738                 }
1739         }
1740 }
1741 #endif
1742
1743 /*
1744  * Local Variables:
1745  *  c-file-style: "linux"
1746  *  tab-width: 8
1747  * End:
1748  */