[ETH]: Make eth_type_trans set skb->dev like the other *_type_trans
[linux-2.6.git] / 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);
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 static unsigned short eexp_start_irq(struct net_device *dev,
718                                      unsigned short status)
719 {
720         unsigned short ack_cmd = SCB_ack(status);
721         struct net_local *lp = netdev_priv(dev);
722         unsigned short ioaddr = dev->base_addr;
723         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_CU)) {
724                 short diag_status, tdr_status;
725                 while (SCB_CUstat(status)==2)
726                         status = scb_status(dev);
727 #if NET_DEBUG > 4
728                 printk("%s: CU went non-active (status %04x)\n",
729                        dev->name, status);
730 #endif
731
732                 outw(CONF_DIAG_RESULT & ~31, ioaddr + SM_PTR);
733                 diag_status = inw(ioaddr + SHADOW(CONF_DIAG_RESULT));
734                 if (diag_status & 1<<11) {
735                         printk(KERN_WARNING "%s: 82586 failed self-test\n",
736                                dev->name);
737                 } else if (!(diag_status & 1<<13)) {
738                         printk(KERN_WARNING "%s: 82586 self-test failed to complete\n", dev->name);
739                 }
740
741                 outw(CONF_TDR_RESULT & ~31, ioaddr + SM_PTR);
742                 tdr_status = inw(ioaddr + SHADOW(CONF_TDR_RESULT));
743                 if (tdr_status & (TDR_SHORT|TDR_OPEN)) {
744                         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" : "");
745                 }
746                 else if (tdr_status & TDR_XCVRPROBLEM) {
747                         printk(KERN_WARNING "%s: TDR reports transceiver problem\n", dev->name);
748                 }
749                 else if (tdr_status & TDR_LINKOK) {
750 #if NET_DEBUG > 4
751                         printk(KERN_DEBUG "%s: TDR reports link OK\n", dev->name);
752 #endif
753                 } else {
754                         printk("%s: TDR is ga-ga (status %04x)\n", dev->name,
755                                tdr_status);
756                 }
757
758                 lp->started |= STARTED_CU;
759                 scb_wrcbl(dev, lp->tx_link);
760                 /* if the RU isn't running, start it now */
761                 if (!(lp->started & STARTED_RU)) {
762                         ack_cmd |= SCB_RUstart;
763                         scb_wrrfa(dev, lp->rx_buf_start);
764                         lp->rx_ptr = lp->rx_buf_start;
765                         lp->started |= STARTED_RU;
766                 }
767                 ack_cmd |= SCB_CUstart | 0x2000;
768         }
769
770         if ((dev->flags & IFF_UP) && !(lp->started & STARTED_RU) && SCB_RUstat(status)==4)
771                 lp->started|=STARTED_RU;
772
773         return ack_cmd;
774 }
775
776 static void eexp_cmd_clear(struct net_device *dev)
777 {
778         unsigned long int oldtime = jiffies;
779         while (scb_rdcmd(dev) && ((jiffies-oldtime)<10));
780         if (scb_rdcmd(dev)) {
781                 printk("%s: command didn't clear\n", dev->name);
782         }
783 }
784
785 static irqreturn_t eexp_irq(int irq, void *dev_info)
786 {
787         struct net_device *dev = dev_info;
788         struct net_local *lp;
789         unsigned short ioaddr,status,ack_cmd;
790         unsigned short old_read_ptr, old_write_ptr;
791
792         lp = netdev_priv(dev);
793         ioaddr = dev->base_addr;
794
795         spin_lock(&lp->lock);
796
797         old_read_ptr = inw(ioaddr+READ_PTR);
798         old_write_ptr = inw(ioaddr+WRITE_PTR);
799
800         outb(SIRQ_dis|irqrmap[irq],ioaddr+SET_IRQ);
801
802
803         status = scb_status(dev);
804
805 #if NET_DEBUG > 4
806         printk(KERN_DEBUG "%s: interrupt (status %x)\n", dev->name, status);
807 #endif
808
809         if (lp->started == (STARTED_CU | STARTED_RU)) {
810
811                 do {
812                         eexp_cmd_clear(dev);
813
814                         ack_cmd = SCB_ack(status);
815                         scb_command(dev, ack_cmd);
816                         outb(0,ioaddr+SIGNAL_CA);
817
818                         eexp_cmd_clear(dev);
819
820                         if (SCB_complete(status)) {
821                                 if (!eexp_hw_lasttxstat(dev)) {
822                                         printk("%s: tx interrupt but no status\n", dev->name);
823                                 }
824                         }
825
826                         if (SCB_rxdframe(status))
827                                 eexp_hw_rx_pio(dev);
828
829                         status = scb_status(dev);
830                 } while (status & 0xc000);
831
832                 if (SCB_RUdead(status))
833                 {
834                         printk(KERN_WARNING "%s: RU stopped: status %04x\n",
835                                dev->name,status);
836 #if 0
837                         printk(KERN_WARNING "%s: cur_rfd=%04x, cur_rbd=%04x\n", dev->name, lp->cur_rfd, lp->cur_rbd);
838                         outw(lp->cur_rfd, ioaddr+READ_PTR);
839                         printk(KERN_WARNING "%s: [%04x]\n", dev->name, inw(ioaddr+DATAPORT));
840                         outw(lp->cur_rfd+6, ioaddr+READ_PTR);
841                         printk(KERN_WARNING "%s: rbd is %04x\n", dev->name, rbd= inw(ioaddr+DATAPORT));
842                         outw(rbd, ioaddr+READ_PTR);
843                         printk(KERN_WARNING "%s: [%04x %04x] ", dev->name, inw(ioaddr+DATAPORT), inw(ioaddr+DATAPORT));
844                         outw(rbd+8, ioaddr+READ_PTR);
845                         printk("[%04x]\n", inw(ioaddr+DATAPORT));
846 #endif
847                         lp->stats.rx_errors++;
848 #if 1
849                         eexp_hw_rxinit(dev);
850 #else
851                         lp->cur_rfd = lp->first_rfd;
852 #endif
853                         scb_wrrfa(dev, lp->rx_buf_start);
854                         scb_command(dev, SCB_RUstart);
855                         outb(0,ioaddr+SIGNAL_CA);
856                 }
857         } else {
858                 if (status & 0x8000)
859                         ack_cmd = eexp_start_irq(dev, status);
860                 else
861                         ack_cmd = SCB_ack(status);
862                 scb_command(dev, ack_cmd);
863                 outb(0,ioaddr+SIGNAL_CA);
864         }
865
866         eexp_cmd_clear(dev);
867
868         outb(SIRQ_en|irqrmap[irq],ioaddr+SET_IRQ);
869
870 #if NET_DEBUG > 6
871         printk("%s: leaving eexp_irq()\n", dev->name);
872 #endif
873         outw(old_read_ptr, ioaddr+READ_PTR);
874         outw(old_write_ptr, ioaddr+WRITE_PTR);
875
876         spin_unlock(&lp->lock);
877         return IRQ_HANDLED;
878 }
879
880 /*
881  * Hardware access functions
882  */
883
884 /*
885  * Set the cable type to use.
886  */
887
888 static void eexp_hw_set_interface(struct net_device *dev)
889 {
890         unsigned char oldval = inb(dev->base_addr + 0x300e);
891         oldval &= ~0x82;
892         switch (dev->if_port) {
893         case TPE:
894                 oldval |= 0x2;
895         case BNC:
896                 oldval |= 0x80;
897                 break;
898         }
899         outb(oldval, dev->base_addr+0x300e);
900         mdelay(20);
901 }
902
903 /*
904  * Check all the receive buffers, and hand any received packets
905  * to the upper levels. Basic sanity check on each frame
906  * descriptor, though we don't bother trying to fix broken ones.
907  */
908
909 static void eexp_hw_rx_pio(struct net_device *dev)
910 {
911         struct net_local *lp = netdev_priv(dev);
912         unsigned short rx_block = lp->rx_ptr;
913         unsigned short boguscount = lp->num_rx_bufs;
914         unsigned short ioaddr = dev->base_addr;
915         unsigned short status;
916
917 #if NET_DEBUG > 6
918         printk(KERN_DEBUG "%s: eexp_hw_rx()\n", dev->name);
919 #endif
920
921         do {
922                 unsigned short rfd_cmd, rx_next, pbuf, pkt_len;
923
924                 outw(rx_block, ioaddr + READ_PTR);
925                 status = inw(ioaddr + DATAPORT);
926
927                 if (FD_Done(status))
928                 {
929                         rfd_cmd = inw(ioaddr + DATAPORT);
930                         rx_next = inw(ioaddr + DATAPORT);
931                         pbuf = inw(ioaddr + DATAPORT);
932
933                         outw(pbuf, ioaddr + READ_PTR);
934                         pkt_len = inw(ioaddr + DATAPORT);
935
936                         if (rfd_cmd!=0x0000)
937                         {
938                                 printk(KERN_WARNING "%s: rfd_cmd not zero:0x%04x\n",
939                                        dev->name, rfd_cmd);
940                                 continue;
941                         }
942                         else if (pbuf!=rx_block+0x16)
943                         {
944                                 printk(KERN_WARNING "%s: rfd and rbd out of sync 0x%04x 0x%04x\n",
945                                        dev->name, rx_block+0x16, pbuf);
946                                 continue;
947                         }
948                         else if ((pkt_len & 0xc000)!=0xc000)
949                         {
950                                 printk(KERN_WARNING "%s: EOF or F not set on received buffer (%04x)\n",
951                                        dev->name, pkt_len & 0xc000);
952                                 continue;
953                         }
954                         else if (!FD_OK(status))
955                         {
956                                 lp->stats.rx_errors++;
957                                 if (FD_CRC(status))
958                                         lp->stats.rx_crc_errors++;
959                                 if (FD_Align(status))
960                                         lp->stats.rx_frame_errors++;
961                                 if (FD_Resrc(status))
962                                         lp->stats.rx_fifo_errors++;
963                                 if (FD_DMA(status))
964                                         lp->stats.rx_over_errors++;
965                                 if (FD_Short(status))
966                                         lp->stats.rx_length_errors++;
967                         }
968                         else
969                         {
970                                 struct sk_buff *skb;
971                                 pkt_len &= 0x3fff;
972                                 skb = dev_alloc_skb(pkt_len+16);
973                                 if (skb == NULL)
974                                 {
975                                         printk(KERN_WARNING "%s: Memory squeeze, dropping packet\n",dev->name);
976                                         lp->stats.rx_dropped++;
977                                         break;
978                                 }
979                                 skb_reserve(skb, 2);
980                                 outw(pbuf+10, ioaddr+READ_PTR);
981                                 insw(ioaddr+DATAPORT, skb_put(skb,pkt_len),(pkt_len+1)>>1);
982                                 skb->protocol = eth_type_trans(skb,dev);
983                                 netif_rx(skb);
984                                 dev->last_rx = jiffies;
985                                 lp->stats.rx_packets++;
986                                 lp->stats.rx_bytes += pkt_len;
987                         }
988                         outw(rx_block, ioaddr+WRITE_PTR);
989                         outw(0, ioaddr+DATAPORT);
990                         outw(0, ioaddr+DATAPORT);
991                         rx_block = rx_next;
992                 }
993         } while (FD_Done(status) && boguscount--);
994         lp->rx_ptr = rx_block;
995 }
996
997 /*
998  * Hand a packet to the card for transmission
999  * If we get here, we MUST have already checked
1000  * to make sure there is room in the transmit
1001  * buffer region.
1002  */
1003
1004 static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
1005                        unsigned short len)
1006 {
1007         struct net_local *lp = netdev_priv(dev);
1008         unsigned short ioaddr = dev->base_addr;
1009
1010         if (LOCKUP16 || lp->width) {
1011                 /* Stop the CU so that there is no chance that it
1012                    jumps off to a bogus address while we are writing the
1013                    pointer to the next transmit packet in 8-bit mode --
1014                    this eliminates the "CU wedged" errors in 8-bit mode.
1015                    (Zoltan Szilagyi 10-12-96) */
1016                 scb_command(dev, SCB_CUsuspend);
1017                 outw(0xFFFF, ioaddr+SIGNAL_CA);
1018         }
1019
1020         outw(lp->tx_head, ioaddr + WRITE_PTR);
1021
1022         outw(0x0000, ioaddr + DATAPORT);
1023         outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1024         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
1025         outw(lp->tx_head+0x0e, ioaddr + DATAPORT);
1026
1027         outw(0x0000, ioaddr + DATAPORT);
1028         outw(0x0000, ioaddr + DATAPORT);
1029         outw(lp->tx_head+0x08, ioaddr + DATAPORT);
1030
1031         outw(0x8000|len, ioaddr + DATAPORT);
1032         outw(-1, ioaddr + DATAPORT);
1033         outw(lp->tx_head+0x16, ioaddr + DATAPORT);
1034         outw(0, ioaddr + DATAPORT);
1035
1036         outsw(ioaddr + DATAPORT, buf, (len+1)>>1);
1037
1038         outw(lp->tx_tail+0xc, ioaddr + WRITE_PTR);
1039         outw(lp->tx_head, ioaddr + DATAPORT);
1040
1041         dev->trans_start = jiffies;
1042         lp->tx_tail = lp->tx_head;
1043         if (lp->tx_head==TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1044                 lp->tx_head = TX_BUF_START;
1045         else
1046                 lp->tx_head += TX_BUF_SIZE;
1047         if (lp->tx_head != lp->tx_reap)
1048                 netif_wake_queue(dev);
1049
1050         if (LOCKUP16 || lp->width) {
1051                 /* Restart the CU so that the packet can actually
1052                    be transmitted. (Zoltan Szilagyi 10-12-96) */
1053                 scb_command(dev, SCB_CUresume);
1054                 outw(0xFFFF, ioaddr+SIGNAL_CA);
1055         }
1056
1057         lp->stats.tx_packets++;
1058         lp->last_tx = jiffies;
1059 }
1060
1061 /*
1062  * Sanity check the suspected EtherExpress card
1063  * Read hardware address, reset card, size memory and initialize buffer
1064  * memory pointers. These are held in dev->priv, in case someone has more
1065  * than one card in a machine.
1066  */
1067
1068 static int __init eexp_hw_probe(struct net_device *dev, unsigned short ioaddr)
1069 {
1070         unsigned short hw_addr[3];
1071         unsigned char buswidth;
1072         unsigned int memory_size;
1073         int i;
1074         unsigned short xsum = 0;
1075         struct net_local *lp = netdev_priv(dev);
1076
1077         printk("%s: EtherExpress 16 at %#x ",dev->name,ioaddr);
1078
1079         outb(ASIC_RST, ioaddr+EEPROM_Ctrl);
1080         outb(0, ioaddr+EEPROM_Ctrl);
1081         udelay(500);
1082         outb(i586_RST, ioaddr+EEPROM_Ctrl);
1083
1084         hw_addr[0] = eexp_hw_readeeprom(ioaddr,2);
1085         hw_addr[1] = eexp_hw_readeeprom(ioaddr,3);
1086         hw_addr[2] = eexp_hw_readeeprom(ioaddr,4);
1087
1088         /* Standard Address or Compaq LTE Address */
1089         if (!((hw_addr[2]==0x00aa && ((hw_addr[1] & 0xff00)==0x0000)) ||
1090               (hw_addr[2]==0x0080 && ((hw_addr[1] & 0xff00)==0x5F00))))
1091         {
1092                 printk(" rejected: invalid address %04x%04x%04x\n",
1093                         hw_addr[2],hw_addr[1],hw_addr[0]);
1094                 return -ENODEV;
1095         }
1096
1097         /* Calculate the EEPROM checksum.  Carry on anyway if it's bad,
1098          * though.
1099          */
1100         for (i = 0; i < 64; i++)
1101                 xsum += eexp_hw_readeeprom(ioaddr, i);
1102         if (xsum != 0xbaba)
1103                 printk(" (bad EEPROM xsum 0x%02x)", xsum);
1104
1105         dev->base_addr = ioaddr;
1106         for ( i=0 ; i<6 ; i++ )
1107                 dev->dev_addr[i] = ((unsigned char *)hw_addr)[5-i];
1108
1109         {
1110                 static char irqmap[]={0, 9, 3, 4, 5, 10, 11, 0};
1111                 unsigned short setupval = eexp_hw_readeeprom(ioaddr,0);
1112
1113                 /* Use the IRQ from EEPROM if none was given */
1114                 if (!dev->irq)
1115                         dev->irq = irqmap[setupval>>13];
1116
1117                 if (dev->if_port == 0xff) {
1118                         dev->if_port = !(setupval & 0x1000) ? AUI :
1119                                 eexp_hw_readeeprom(ioaddr,5) & 0x1 ? TPE : BNC;
1120                 }
1121
1122                 buswidth = !((setupval & 0x400) >> 10);
1123         }
1124
1125         memset(lp, 0, sizeof(struct net_local));
1126         spin_lock_init(&lp->lock);
1127
1128         printk("(IRQ %d, %s connector, %d-bit bus", dev->irq,
1129                eexp_ifmap[dev->if_port], buswidth?8:16);
1130
1131         if (!request_region(dev->base_addr + 0x300e, 1, "EtherExpress"))
1132                 return -EBUSY;
1133
1134         eexp_hw_set_interface(dev);
1135
1136         release_region(dev->base_addr + 0x300e, 1);
1137
1138         /* Find out how much RAM we have on the card */
1139         outw(0, dev->base_addr + WRITE_PTR);
1140         for (i = 0; i < 32768; i++)
1141                 outw(0, dev->base_addr + DATAPORT);
1142
1143         for (memory_size = 0; memory_size < 64; memory_size++)
1144         {
1145                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1146                 if (inw(dev->base_addr+DATAPORT))
1147                         break;
1148                 outw(memory_size<<10, dev->base_addr + WRITE_PTR);
1149                 outw(memory_size | 0x5000, dev->base_addr+DATAPORT);
1150                 outw(memory_size<<10, dev->base_addr + READ_PTR);
1151                 if (inw(dev->base_addr+DATAPORT) != (memory_size | 0x5000))
1152                         break;
1153         }
1154
1155         /* Sort out the number of buffers.  We may have 16, 32, 48 or 64k
1156          * of RAM to play with.
1157          */
1158         lp->num_tx_bufs = 4;
1159         lp->rx_buf_end = 0x3ff6;
1160         switch (memory_size)
1161         {
1162         case 64:
1163                 lp->rx_buf_end += 0x4000;
1164         case 48:
1165                 lp->num_tx_bufs += 4;
1166                 lp->rx_buf_end += 0x4000;
1167         case 32:
1168                 lp->rx_buf_end += 0x4000;
1169         case 16:
1170                 printk(", %dk RAM)\n", memory_size);
1171                 break;
1172         default:
1173                 printk(") bad memory size (%dk).\n", memory_size);
1174                 return -ENODEV;
1175                 break;
1176         }
1177
1178         lp->rx_buf_start = TX_BUF_START + (lp->num_tx_bufs*TX_BUF_SIZE);
1179         lp->width = buswidth;
1180
1181         dev->open = eexp_open;
1182         dev->stop = eexp_close;
1183         dev->hard_start_xmit = eexp_xmit;
1184         dev->get_stats = eexp_stats;
1185         dev->set_multicast_list = &eexp_set_multicast;
1186         dev->tx_timeout = eexp_timeout;
1187         dev->watchdog_timeo = 2*HZ;
1188
1189         return register_netdev(dev);
1190 }
1191
1192 /*
1193  * Read a word from the EtherExpress on-board serial EEPROM.
1194  * The EEPROM contains 64 words of 16 bits.
1195  */
1196 static unsigned short __init eexp_hw_readeeprom(unsigned short ioaddr,
1197                                                     unsigned char location)
1198 {
1199         unsigned short cmd = 0x180|(location&0x7f);
1200         unsigned short rval = 0,wval = EC_CS|i586_RST;
1201         int i;
1202
1203         outb(EC_CS|i586_RST,ioaddr+EEPROM_Ctrl);
1204         for (i=0x100 ; i ; i>>=1 )
1205         {
1206                 if (cmd&i)
1207                         wval |= EC_Wr;
1208                 else
1209                         wval &= ~EC_Wr;
1210
1211                 outb(wval,ioaddr+EEPROM_Ctrl);
1212                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1213                 eeprom_delay();
1214                 outb(wval,ioaddr+EEPROM_Ctrl);
1215                 eeprom_delay();
1216         }
1217         wval &= ~EC_Wr;
1218         outb(wval,ioaddr+EEPROM_Ctrl);
1219         for (i=0x8000 ; i ; i>>=1 )
1220         {
1221                 outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1222                 eeprom_delay();
1223                 if (inb(ioaddr+EEPROM_Ctrl)&EC_Rd)
1224                         rval |= i;
1225                 outb(wval,ioaddr+EEPROM_Ctrl);
1226                 eeprom_delay();
1227         }
1228         wval &= ~EC_CS;
1229         outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
1230         eeprom_delay();
1231         outb(wval,ioaddr+EEPROM_Ctrl);
1232         eeprom_delay();
1233         return rval;
1234 }
1235
1236 /*
1237  * Reap tx buffers and return last transmit status.
1238  * if ==0 then either:
1239  *    a) we're not transmitting anything, so why are we here?
1240  *    b) we've died.
1241  * otherwise, Stat_Busy(return) means we've still got some packets
1242  * to transmit, Stat_Done(return) means our buffers should be empty
1243  * again
1244  */
1245
1246 static unsigned short eexp_hw_lasttxstat(struct net_device *dev)
1247 {
1248         struct net_local *lp = netdev_priv(dev);
1249         unsigned short tx_block = lp->tx_reap;
1250         unsigned short status;
1251
1252         if (!netif_queue_stopped(dev) && lp->tx_head==lp->tx_reap)
1253                 return 0x0000;
1254
1255         do
1256         {
1257                 outw(tx_block & ~31, dev->base_addr + SM_PTR);
1258                 status = inw(dev->base_addr + SHADOW(tx_block));
1259                 if (!Stat_Done(status))
1260                 {
1261                         lp->tx_link = tx_block;
1262                         return status;
1263                 }
1264                 else
1265                 {
1266                         lp->last_tx_restart = 0;
1267                         lp->stats.collisions += Stat_NoColl(status);
1268                         if (!Stat_OK(status))
1269                         {
1270                                 char *whatsup = NULL;
1271                                 lp->stats.tx_errors++;
1272                                 if (Stat_Abort(status))
1273                                         lp->stats.tx_aborted_errors++;
1274                                 if (Stat_TNoCar(status)) {
1275                                         whatsup = "aborted, no carrier";
1276                                         lp->stats.tx_carrier_errors++;
1277                                 }
1278                                 if (Stat_TNoCTS(status)) {
1279                                         whatsup = "aborted, lost CTS";
1280                                         lp->stats.tx_carrier_errors++;
1281                                 }
1282                                 if (Stat_TNoDMA(status)) {
1283                                         whatsup = "FIFO underran";
1284                                         lp->stats.tx_fifo_errors++;
1285                                 }
1286                                 if (Stat_TXColl(status)) {
1287                                         whatsup = "aborted, too many collisions";
1288                                         lp->stats.tx_aborted_errors++;
1289                                 }
1290                                 if (whatsup)
1291                                         printk(KERN_INFO "%s: transmit %s\n",
1292                                                dev->name, whatsup);
1293                         }
1294                         else
1295                                 lp->stats.tx_packets++;
1296                 }
1297                 if (tx_block == TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
1298                         lp->tx_reap = tx_block = TX_BUF_START;
1299                 else
1300                         lp->tx_reap = tx_block += TX_BUF_SIZE;
1301                 netif_wake_queue(dev);
1302         }
1303         while (lp->tx_reap != lp->tx_head);
1304
1305         lp->tx_link = lp->tx_tail + 0x08;
1306
1307         return status;
1308 }
1309
1310 /*
1311  * This should never happen. It is called when some higher routine detects
1312  * that the CU has stopped, to try to restart it from the last packet we knew
1313  * we were working on, or the idle loop if we had finished for the time.
1314  */
1315
1316 static void eexp_hw_txrestart(struct net_device *dev)
1317 {
1318         struct net_local *lp = netdev_priv(dev);
1319         unsigned short ioaddr = dev->base_addr;
1320
1321         lp->last_tx_restart = lp->tx_link;
1322         scb_wrcbl(dev, lp->tx_link);
1323         scb_command(dev, SCB_CUstart);
1324         outb(0,ioaddr+SIGNAL_CA);
1325
1326         {
1327                 unsigned short boguscount=50,failcount=5;
1328                 while (!scb_status(dev))
1329                 {
1330                         if (!--boguscount)
1331                         {
1332                                 if (--failcount)
1333                                 {
1334                                         printk(KERN_WARNING "%s: CU start timed out, status %04x, cmd %04x\n", dev->name, scb_status(dev), scb_rdcmd(dev));
1335                                         scb_wrcbl(dev, lp->tx_link);
1336                                         scb_command(dev, SCB_CUstart);
1337                                         outb(0,ioaddr+SIGNAL_CA);
1338                                         boguscount = 100;
1339                                 }
1340                                 else
1341                                 {
1342                                         printk(KERN_WARNING "%s: Failed to restart CU, resetting board...\n",dev->name);
1343                                         eexp_hw_init586(dev);
1344                                         netif_wake_queue(dev);
1345                                         return;
1346                                 }
1347                         }
1348                 }
1349         }
1350 }
1351
1352 /*
1353  * Writes down the list of transmit buffers into card memory.  Each
1354  * entry consists of an 82586 transmit command, followed by a jump
1355  * pointing to itself.  When we want to transmit a packet, we write
1356  * the data into the appropriate transmit buffer and then modify the
1357  * preceding jump to point at the new transmit command.  This means that
1358  * the 586 command unit is continuously active.
1359  */
1360
1361 static void eexp_hw_txinit(struct net_device *dev)
1362 {
1363         struct net_local *lp = netdev_priv(dev);
1364         unsigned short tx_block = TX_BUF_START;
1365         unsigned short curtbuf;
1366         unsigned short ioaddr = dev->base_addr;
1367
1368         for ( curtbuf=0 ; curtbuf<lp->num_tx_bufs ; curtbuf++ )
1369         {
1370                 outw(tx_block, ioaddr + WRITE_PTR);
1371
1372                 outw(0x0000, ioaddr + DATAPORT);
1373                 outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
1374                 outw(tx_block+0x08, ioaddr + DATAPORT);
1375                 outw(tx_block+0x0e, ioaddr + DATAPORT);
1376
1377                 outw(0x0000, ioaddr + DATAPORT);
1378                 outw(0x0000, ioaddr + DATAPORT);
1379                 outw(tx_block+0x08, ioaddr + DATAPORT);
1380
1381                 outw(0x8000, ioaddr + DATAPORT);
1382                 outw(-1, ioaddr + DATAPORT);
1383                 outw(tx_block+0x16, ioaddr + DATAPORT);
1384                 outw(0x0000, ioaddr + DATAPORT);
1385
1386                 tx_block += TX_BUF_SIZE;
1387         }
1388         lp->tx_head = TX_BUF_START;
1389         lp->tx_reap = TX_BUF_START;
1390         lp->tx_tail = tx_block - TX_BUF_SIZE;
1391         lp->tx_link = lp->tx_tail + 0x08;
1392         lp->rx_buf_start = tx_block;
1393
1394 }
1395
1396 /*
1397  * Write the circular list of receive buffer descriptors to card memory.
1398  * The end of the list isn't marked, which means that the 82586 receive
1399  * unit will loop until buffers become available (this avoids it giving us
1400  * "out of resources" messages).
1401  */
1402
1403 static void eexp_hw_rxinit(struct net_device *dev)
1404 {
1405         struct net_local *lp = netdev_priv(dev);
1406         unsigned short rx_block = lp->rx_buf_start;
1407         unsigned short ioaddr = dev->base_addr;
1408
1409         lp->num_rx_bufs = 0;
1410         lp->rx_first = lp->rx_ptr = rx_block;
1411         do
1412         {
1413                 lp->num_rx_bufs++;
1414
1415                 outw(rx_block, ioaddr + WRITE_PTR);
1416
1417                 outw(0, ioaddr + DATAPORT);  outw(0, ioaddr+DATAPORT);
1418                 outw(rx_block + RX_BUF_SIZE, ioaddr+DATAPORT);
1419                 outw(0xffff, ioaddr+DATAPORT);
1420
1421                 outw(0x0000, ioaddr+DATAPORT);
1422                 outw(0xdead, ioaddr+DATAPORT);
1423                 outw(0xdead, ioaddr+DATAPORT);
1424                 outw(0xdead, ioaddr+DATAPORT);
1425                 outw(0xdead, ioaddr+DATAPORT);
1426                 outw(0xdead, ioaddr+DATAPORT);
1427                 outw(0xdead, ioaddr+DATAPORT);
1428
1429                 outw(0x0000, ioaddr+DATAPORT);
1430                 outw(rx_block + RX_BUF_SIZE + 0x16, ioaddr+DATAPORT);
1431                 outw(rx_block + 0x20, ioaddr+DATAPORT);
1432                 outw(0, ioaddr+DATAPORT);
1433                 outw(RX_BUF_SIZE-0x20, ioaddr+DATAPORT);
1434
1435                 lp->rx_last = rx_block;
1436                 rx_block += RX_BUF_SIZE;
1437         } while (rx_block <= lp->rx_buf_end-RX_BUF_SIZE);
1438
1439
1440         /* Make first Rx frame descriptor point to first Rx buffer
1441            descriptor */
1442         outw(lp->rx_first + 6, ioaddr+WRITE_PTR);
1443         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1444
1445         /* Close Rx frame descriptor ring */
1446         outw(lp->rx_last + 4, ioaddr+WRITE_PTR);
1447         outw(lp->rx_first, ioaddr+DATAPORT);
1448
1449         /* Close Rx buffer descriptor ring */
1450         outw(lp->rx_last + 0x16 + 2, ioaddr+WRITE_PTR);
1451         outw(lp->rx_first + 0x16, ioaddr+DATAPORT);
1452
1453 }
1454
1455 /*
1456  * Un-reset the 586, and start the configuration sequence. We don't wait for
1457  * this to finish, but allow the interrupt handler to start the CU and RU for
1458  * us.  We can't start the receive/transmission system up before we know that
1459  * the hardware is configured correctly.
1460  */
1461
1462 static void eexp_hw_init586(struct net_device *dev)
1463 {
1464         struct net_local *lp = netdev_priv(dev);
1465         unsigned short ioaddr = dev->base_addr;
1466         int i;
1467
1468 #if NET_DEBUG > 6
1469         printk("%s: eexp_hw_init586()\n", dev->name);
1470 #endif
1471
1472         lp->started = 0;
1473
1474         set_loopback(dev);
1475
1476         outb(SIRQ_dis|irqrmap[dev->irq],ioaddr+SET_IRQ);
1477
1478         /* Download the startup code */
1479         outw(lp->rx_buf_end & ~31, ioaddr + SM_PTR);
1480         outw(lp->width?0x0001:0x0000, ioaddr + 0x8006);
1481         outw(0x0000, ioaddr + 0x8008);
1482         outw(0x0000, ioaddr + 0x800a);
1483         outw(0x0000, ioaddr + 0x800c);
1484         outw(0x0000, ioaddr + 0x800e);
1485
1486         for (i = 0; i < (sizeof(start_code)); i+=32) {
1487                 int j;
1488                 outw(i, ioaddr + SM_PTR);
1489                 for (j = 0; j < 16; j+=2)
1490                         outw(start_code[(i+j)/2],
1491                              ioaddr+0x4000+j);
1492                 for (j = 0; j < 16; j+=2)
1493                         outw(start_code[(i+j+16)/2],
1494                              ioaddr+0x8000+j);
1495         }
1496
1497         /* Do we want promiscuous mode or multicast? */
1498         outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1499         i = inw(ioaddr+SHADOW(CONF_PROMISC));
1500         outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1501              ioaddr+SHADOW(CONF_PROMISC));
1502         lp->was_promisc = dev->flags & IFF_PROMISC;
1503 #if 0
1504         eexp_setup_filter(dev);
1505 #endif
1506
1507         /* Write our hardware address */
1508         outw(CONF_HWADDR & ~31, ioaddr+SM_PTR);
1509         outw(((unsigned short *)dev->dev_addr)[0], ioaddr+SHADOW(CONF_HWADDR));
1510         outw(((unsigned short *)dev->dev_addr)[1],
1511              ioaddr+SHADOW(CONF_HWADDR+2));
1512         outw(((unsigned short *)dev->dev_addr)[2],
1513              ioaddr+SHADOW(CONF_HWADDR+4));
1514
1515         eexp_hw_txinit(dev);
1516         eexp_hw_rxinit(dev);
1517
1518         outb(0,ioaddr+EEPROM_Ctrl);
1519         mdelay(5);
1520
1521         scb_command(dev, 0xf000);
1522         outb(0,ioaddr+SIGNAL_CA);
1523
1524         outw(0, ioaddr+SM_PTR);
1525
1526         {
1527                 unsigned short rboguscount=50,rfailcount=5;
1528                 while (inw(ioaddr+0x4000))
1529                 {
1530                         if (!--rboguscount)
1531                         {
1532                                 printk(KERN_WARNING "%s: i82586 reset timed out, kicking...\n",
1533                                         dev->name);
1534                                 scb_command(dev, 0);
1535                                 outb(0,ioaddr+SIGNAL_CA);
1536                                 rboguscount = 100;
1537                                 if (!--rfailcount)
1538                                 {
1539                                         printk(KERN_WARNING "%s: i82586 not responding, giving up.\n",
1540                                                 dev->name);
1541                                         return;
1542                                 }
1543                         }
1544                 }
1545         }
1546
1547         scb_wrcbl(dev, CONF_LINK);
1548         scb_command(dev, 0xf000|SCB_CUstart);
1549         outb(0,ioaddr+SIGNAL_CA);
1550
1551         {
1552                 unsigned short iboguscount=50,ifailcount=5;
1553                 while (!scb_status(dev))
1554                 {
1555                         if (!--iboguscount)
1556                         {
1557                                 if (--ifailcount)
1558                                 {
1559                                         printk(KERN_WARNING "%s: i82586 initialization timed out, status %04x, cmd %04x\n",
1560                                                 dev->name, scb_status(dev), scb_rdcmd(dev));
1561                                         scb_wrcbl(dev, CONF_LINK);
1562                                         scb_command(dev, 0xf000|SCB_CUstart);
1563                                         outb(0,ioaddr+SIGNAL_CA);
1564                                         iboguscount = 100;
1565                                 }
1566                                 else
1567                                 {
1568                                         printk(KERN_WARNING "%s: Failed to initialize i82586, giving up.\n",dev->name);
1569                                         return;
1570                                 }
1571                         }
1572                 }
1573         }
1574
1575         clear_loopback(dev);
1576         outb(SIRQ_en|irqrmap[dev->irq],ioaddr+SET_IRQ);
1577
1578         lp->init_time = jiffies;
1579 #if NET_DEBUG > 6
1580         printk("%s: leaving eexp_hw_init586()\n", dev->name);
1581 #endif
1582         return;
1583 }
1584
1585 static void eexp_setup_filter(struct net_device *dev)
1586 {
1587         struct dev_mc_list *dmi = dev->mc_list;
1588         unsigned short ioaddr = dev->base_addr;
1589         int count = dev->mc_count;
1590         int i;
1591         if (count > 8) {
1592                 printk(KERN_INFO "%s: too many multicast addresses (%d)\n",
1593                        dev->name, count);
1594                 count = 8;
1595         }
1596
1597         outw(CONF_NR_MULTICAST & ~31, ioaddr+SM_PTR);
1598         outw(count, ioaddr+SHADOW(CONF_NR_MULTICAST));
1599         for (i = 0; i < count; i++) {
1600                 unsigned short *data = (unsigned short *)dmi->dmi_addr;
1601                 if (!dmi) {
1602                         printk(KERN_INFO "%s: too few multicast addresses\n", dev->name);
1603                         break;
1604                 }
1605                 if (dmi->dmi_addrlen != ETH_ALEN) {
1606                         printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
1607                         continue;
1608                 }
1609                 outw((CONF_MULTICAST+(6*i)) & ~31, ioaddr+SM_PTR);
1610                 outw(data[0], ioaddr+SHADOW(CONF_MULTICAST+(6*i)));
1611                 outw((CONF_MULTICAST+(6*i)+2) & ~31, ioaddr+SM_PTR);
1612                 outw(data[1], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+2));
1613                 outw((CONF_MULTICAST+(6*i)+4) & ~31, ioaddr+SM_PTR);
1614                 outw(data[2], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+4));
1615         }
1616 }
1617
1618 /*
1619  * Set or clear the multicast filter for this adaptor.
1620  */
1621 static void
1622 eexp_set_multicast(struct net_device *dev)
1623 {
1624         unsigned short ioaddr = dev->base_addr;
1625         struct net_local *lp = netdev_priv(dev);
1626         int kick = 0, i;
1627         if ((dev->flags & IFF_PROMISC) != lp->was_promisc) {
1628                 outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
1629                 i = inw(ioaddr+SHADOW(CONF_PROMISC));
1630                 outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
1631                      ioaddr+SHADOW(CONF_PROMISC));
1632                 lp->was_promisc = dev->flags & IFF_PROMISC;
1633                 kick = 1;
1634         }
1635         if (!(dev->flags & IFF_PROMISC)) {
1636                 eexp_setup_filter(dev);
1637                 if (lp->old_mc_count != dev->mc_count) {
1638                         kick = 1;
1639                         lp->old_mc_count = dev->mc_count;
1640                 }
1641         }
1642         if (kick) {
1643                 unsigned long oj;
1644                 scb_command(dev, SCB_CUsuspend);
1645                 outb(0, ioaddr+SIGNAL_CA);
1646                 outb(0, ioaddr+SIGNAL_CA);
1647 #if 0
1648                 printk("%s: waiting for CU to go suspended\n", dev->name);
1649 #endif
1650                 oj = jiffies;
1651                 while ((SCB_CUstat(scb_status(dev)) == 2) &&
1652                        ((jiffies-oj) < 2000));
1653                 if (SCB_CUstat(scb_status(dev)) == 2)
1654                         printk("%s: warning, CU didn't stop\n", dev->name);
1655                 lp->started &= ~(STARTED_CU);
1656                 scb_wrcbl(dev, CONF_LINK);
1657                 scb_command(dev, SCB_CUstart);
1658                 outb(0, ioaddr+SIGNAL_CA);
1659         }
1660 }
1661
1662
1663 /*
1664  * MODULE stuff
1665  */
1666
1667 #ifdef MODULE
1668
1669 #define EEXP_MAX_CARDS     4    /* max number of cards to support */
1670
1671 static struct net_device *dev_eexp[EEXP_MAX_CARDS];
1672 static int irq[EEXP_MAX_CARDS];
1673 static int io[EEXP_MAX_CARDS];
1674
1675 module_param_array(io, int, NULL, 0);
1676 module_param_array(irq, int, NULL, 0);
1677 MODULE_PARM_DESC(io, "EtherExpress 16 I/O base address(es)");
1678 MODULE_PARM_DESC(irq, "EtherExpress 16 IRQ number(s)");
1679 MODULE_LICENSE("GPL");
1680
1681
1682 /* Ideally the user would give us io=, irq= for every card.  If any parameters
1683  * are specified, we verify and then use them.  If no parameters are given, we
1684  * autoprobe for one card only.
1685  */
1686 int __init init_module(void)
1687 {
1688         struct net_device *dev;
1689         int this_dev, found = 0;
1690
1691         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1692                 dev = alloc_etherdev(sizeof(struct net_local));
1693                 dev->irq = irq[this_dev];
1694                 dev->base_addr = io[this_dev];
1695                 if (io[this_dev] == 0) {
1696                         if (this_dev)
1697                                 break;
1698                         printk(KERN_NOTICE "eexpress.c: Module autoprobe not recommended, give io=xx.\n");
1699                 }
1700                 if (do_express_probe(dev) == 0) {
1701                         dev_eexp[this_dev] = dev;
1702                         found++;
1703                         continue;
1704                 }
1705                 printk(KERN_WARNING "eexpress.c: Failed to register card at 0x%x.\n", io[this_dev]);
1706                 free_netdev(dev);
1707                 break;
1708         }
1709         if (found)
1710                 return 0;
1711         return -ENXIO;
1712 }
1713
1714 void __exit cleanup_module(void)
1715 {
1716         int this_dev;
1717
1718         for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
1719                 struct net_device *dev = dev_eexp[this_dev];
1720                 if (dev) {
1721                         unregister_netdev(dev);
1722                         free_netdev(dev);
1723                 }
1724         }
1725 }
1726 #endif
1727
1728 /*
1729  * Local Variables:
1730  *  c-file-style: "linux"
1731  *  tab-width: 8
1732  * End:
1733  */