IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-2.6.git] / drivers / net / 3c505.c
1 /*
2  * Linux Ethernet device driver for the 3Com Etherlink Plus (3C505)
3  *      By Craig Southeren, Juha Laiho and Philip Blundell
4  *
5  * 3c505.c      This module implements an interface to the 3Com
6  *              Etherlink Plus (3c505) Ethernet card. Linux device
7  *              driver interface reverse engineered from the Linux 3C509
8  *              device drivers. Some 3C505 information gleaned from
9  *              the Crynwr packet driver. Still this driver would not
10  *              be here without 3C505 technical reference provided by
11  *              3Com.
12  *
13  * $Id: 3c505.c,v 1.10 1996/04/16 13:06:27 phil Exp $
14  *
15  * Authors:     Linux 3c505 device driver by
16  *                      Craig Southeren, <craigs@ineluki.apana.org.au>
17  *              Final debugging by
18  *                      Andrew Tridgell, <tridge@nimbus.anu.edu.au>
19  *              Auto irq/address, tuning, cleanup and v1.1.4+ kernel mods by
20  *                      Juha Laiho, <jlaiho@ichaos.nullnet.fi>
21  *              Linux 3C509 driver by
22  *                      Donald Becker, <becker@super.org>
23  *                      (Now at <becker@scyld.com>)
24  *              Crynwr packet driver by
25  *                      Krishnan Gopalan and Gregg Stefancik,
26  *                      Clemson University Engineering Computer Operations.
27  *                      Portions of the code have been adapted from the 3c505
28  *                         driver for NCSA Telnet by Bruce Orchard and later
29  *                         modified by Warren Van Houten and krus@diku.dk.
30  *              3C505 technical information provided by
31  *                      Terry Murphy, of 3Com Network Adapter Division
32  *              Linux 1.3.0 changes by
33  *                      Alan Cox <Alan.Cox@linux.org>
34  *              More debugging, DMA support, currently maintained by
35  *                      Philip Blundell <philb@gnu.org>
36  *              Multicard/soft configurable dma channel/rev 2 hardware support
37  *                      by Christopher Collins <ccollins@pcug.org.au>
38  *              Ethtool support (jgarzik), 11/17/2001
39  */
40
41 #define DRV_NAME        "3c505"
42 #define DRV_VERSION     "1.10a"
43
44
45 /* Theory of operation:
46  *
47  * The 3c505 is quite an intelligent board.  All communication with it is done
48  * by means of Primary Command Blocks (PCBs); these are transferred using PIO
49  * through the command register.  The card has 256k of on-board RAM, which is
50  * used to buffer received packets.  It might seem at first that more buffers
51  * are better, but in fact this isn't true.  From my tests, it seems that
52  * more than about 10 buffers are unnecessary, and there is a noticeable
53  * performance hit in having more active on the card.  So the majority of the
54  * card's memory isn't, in fact, used.  Sadly, the card only has one transmit
55  * buffer and, short of loading our own firmware into it (which is what some
56  * drivers resort to) there's nothing we can do about this.
57  *
58  * We keep up to 4 "receive packet" commands active on the board at a time.
59  * When a packet comes in, so long as there is a receive command active, the
60  * board will send us a "packet received" PCB and then add the data for that
61  * packet to the DMA queue.  If a DMA transfer is not already in progress, we
62  * set one up to start uploading the data.  We have to maintain a list of
63  * backlogged receive packets, because the card may decide to tell us about
64  * a newly-arrived packet at any time, and we may not be able to start a DMA
65  * transfer immediately (ie one may already be going on).  We can't NAK the
66  * PCB, because then it would throw the packet away.
67  *
68  * Trying to send a PCB to the card at the wrong moment seems to have bad
69  * effects.  If we send it a transmit PCB while a receive DMA is happening,
70  * it will just NAK the PCB and so we will have wasted our time.  Worse, it
71  * sometimes seems to interrupt the transfer.  The majority of the low-level
72  * code is protected by one huge semaphore -- "busy" -- which is set whenever
73  * it probably isn't safe to do anything to the card.  The receive routine
74  * must gain a lock on "busy" before it can start a DMA transfer, and the
75  * transmit routine must gain a lock before it sends the first PCB to the card.
76  * The send_pcb() routine also has an internal semaphore to protect it against
77  * being re-entered (which would be disastrous) -- this is needed because
78  * several things can happen asynchronously (re-priming the receiver and
79  * asking the card for statistics, for example).  send_pcb() will also refuse
80  * to talk to the card at all if a DMA upload is happening.  The higher-level
81  * networking code will reschedule a later retry if some part of the driver
82  * is blocked.  In practice, this doesn't seem to happen very often.
83  */
84
85 /* This driver may now work with revision 2.x hardware, since all the read
86  * operations on the HCR have been removed (we now keep our own softcopy).
87  * But I don't have an old card to test it on.
88  *
89  * This has had the bad effect that the autoprobe routine is now a bit
90  * less friendly to other devices.  However, it was never very good.
91  * before, so I doubt it will hurt anybody.
92  */
93
94 /* The driver is a mess.  I took Craig's and Juha's code, and hacked it firstly
95  * to make it more reliable, and secondly to add DMA mode.  Many things could
96  * probably be done better; the concurrency protection is particularly awful.
97  */
98
99 #include <linux/module.h>
100 #include <linux/kernel.h>
101 #include <linux/string.h>
102 #include <linux/interrupt.h>
103 #include <linux/errno.h>
104 #include <linux/in.h>
105 #include <linux/slab.h>
106 #include <linux/ioport.h>
107 #include <linux/spinlock.h>
108 #include <linux/ethtool.h>
109 #include <linux/delay.h>
110 #include <linux/bitops.h>
111
112 #include <asm/uaccess.h>
113 #include <asm/io.h>
114 #include <asm/dma.h>
115
116 #include <linux/netdevice.h>
117 #include <linux/etherdevice.h>
118 #include <linux/skbuff.h>
119 #include <linux/init.h>
120
121 #include "3c505.h"
122
123 /*********************************************************
124  *
125  *  define debug messages here as common strings to reduce space
126  *
127  *********************************************************/
128
129 static const char filename[] = __FILE__;
130
131 static const char timeout_msg[] = "*** timeout at %s:%s (line %d) ***\n";
132 #define TIMEOUT_MSG(lineno) \
133         printk(timeout_msg, filename,__FUNCTION__,(lineno))
134
135 static const char invalid_pcb_msg[] =
136 "*** invalid pcb length %d at %s:%s (line %d) ***\n";
137 #define INVALID_PCB_MSG(len) \
138         printk(invalid_pcb_msg, (len),filename,__FUNCTION__,__LINE__)
139
140 static char search_msg[] __initdata = KERN_INFO "%s: Looking for 3c505 adapter at address %#x...";
141
142 static char stilllooking_msg[] __initdata = "still looking...";
143
144 static char found_msg[] __initdata = "found.\n";
145
146 static char notfound_msg[] __initdata = "not found (reason = %d)\n";
147
148 static char couldnot_msg[] __initdata = KERN_INFO "%s: 3c505 not found\n";
149
150 /*********************************************************
151  *
152  *  various other debug stuff
153  *
154  *********************************************************/
155
156 #ifdef ELP_DEBUG
157 static int elp_debug = ELP_DEBUG;
158 #else
159 static int elp_debug;
160 #endif
161 #define debug elp_debug
162
163 /*
164  *  0 = no messages (well, some)
165  *  1 = messages when high level commands performed
166  *  2 = messages when low level commands performed
167  *  3 = messages when interrupts received
168  */
169
170 /*****************************************************************
171  *
172  * useful macros
173  *
174  *****************************************************************/
175
176 #ifndef TRUE
177 #define TRUE    1
178 #endif
179
180 #ifndef FALSE
181 #define FALSE   0
182 #endif
183
184
185 /*****************************************************************
186  *
187  * List of I/O-addresses we try to auto-sense
188  * Last element MUST BE 0!
189  *****************************************************************/
190
191 static int addr_list[] __initdata = {0x300, 0x280, 0x310, 0};
192
193 /* Dma Memory related stuff */
194
195 static unsigned long dma_mem_alloc(int size)
196 {
197         int order = get_order(size);
198         return __get_dma_pages(GFP_KERNEL, order);
199 }
200
201
202 /*****************************************************************
203  *
204  * Functions for I/O (note the inline !)
205  *
206  *****************************************************************/
207
208 static inline unsigned char inb_status(unsigned int base_addr)
209 {
210         return inb(base_addr + PORT_STATUS);
211 }
212
213 static inline int inb_command(unsigned int base_addr)
214 {
215         return inb(base_addr + PORT_COMMAND);
216 }
217
218 static inline void outb_control(unsigned char val, struct net_device *dev)
219 {
220         outb(val, dev->base_addr + PORT_CONTROL);
221         ((elp_device *)(dev->priv))->hcr_val = val;
222 }
223
224 #define HCR_VAL(x)   (((elp_device *)((x)->priv))->hcr_val)
225
226 static inline void outb_command(unsigned char val, unsigned int base_addr)
227 {
228         outb(val, base_addr + PORT_COMMAND);
229 }
230
231 static inline unsigned int backlog_next(unsigned int n)
232 {
233         return (n + 1) % BACKLOG_SIZE;
234 }
235
236 /*****************************************************************
237  *
238  *  useful functions for accessing the adapter
239  *
240  *****************************************************************/
241
242 /*
243  * use this routine when accessing the ASF bits as they are
244  * changed asynchronously by the adapter
245  */
246
247 /* get adapter PCB status */
248 #define GET_ASF(addr) \
249         (get_status(addr)&ASF_PCB_MASK)
250
251 static inline int get_status(unsigned int base_addr)
252 {
253         unsigned long timeout = jiffies + 10*HZ/100;
254         register int stat1;
255         do {
256                 stat1 = inb_status(base_addr);
257         } while (stat1 != inb_status(base_addr) && time_before(jiffies, timeout));
258         if (time_after_eq(jiffies, timeout))
259                 TIMEOUT_MSG(__LINE__);
260         return stat1;
261 }
262
263 static inline void set_hsf(struct net_device *dev, int hsf)
264 {
265         elp_device *adapter = dev->priv;
266         unsigned long flags;
267
268         spin_lock_irqsave(&adapter->lock, flags);
269         outb_control((HCR_VAL(dev) & ~HSF_PCB_MASK) | hsf, dev);
270         spin_unlock_irqrestore(&adapter->lock, flags);
271 }
272
273 static int start_receive(struct net_device *, pcb_struct *);
274
275 static inline void adapter_reset(struct net_device *dev)
276 {
277         unsigned long timeout;
278         elp_device *adapter = dev->priv;
279         unsigned char orig_hcr = adapter->hcr_val;
280
281         outb_control(0, dev);
282
283         if (inb_status(dev->base_addr) & ACRF) {
284                 do {
285                         inb_command(dev->base_addr);
286                         timeout = jiffies + 2*HZ/100;
287                         while (time_before_eq(jiffies, timeout) && !(inb_status(dev->base_addr) & ACRF));
288                 } while (inb_status(dev->base_addr) & ACRF);
289                 set_hsf(dev, HSF_PCB_NAK);
290         }
291         outb_control(adapter->hcr_val | ATTN | DIR, dev);
292         mdelay(10);
293         outb_control(adapter->hcr_val & ~ATTN, dev);
294         mdelay(10);
295         outb_control(adapter->hcr_val | FLSH, dev);
296         mdelay(10);
297         outb_control(adapter->hcr_val & ~FLSH, dev);
298         mdelay(10);
299
300         outb_control(orig_hcr, dev);
301         if (!start_receive(dev, &adapter->tx_pcb))
302                 printk(KERN_ERR "%s: start receive command failed \n", dev->name);
303 }
304
305 /* Check to make sure that a DMA transfer hasn't timed out.  This should
306  * never happen in theory, but seems to occur occasionally if the card gets
307  * prodded at the wrong time.
308  */
309 static inline void check_3c505_dma(struct net_device *dev)
310 {
311         elp_device *adapter = dev->priv;
312         if (adapter->dmaing && time_after(jiffies, adapter->current_dma.start_time + 10)) {
313                 unsigned long flags, f;
314                 printk(KERN_ERR "%s: DMA %s timed out, %d bytes left\n", dev->name, adapter->current_dma.direction ? "download" : "upload", get_dma_residue(dev->dma));
315                 spin_lock_irqsave(&adapter->lock, flags);
316                 adapter->dmaing = 0;
317                 adapter->busy = 0;
318
319                 f=claim_dma_lock();
320                 disable_dma(dev->dma);
321                 release_dma_lock(f);
322
323                 if (adapter->rx_active)
324                         adapter->rx_active--;
325                 outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
326                 spin_unlock_irqrestore(&adapter->lock, flags);
327         }
328 }
329
330 /* Primitive functions used by send_pcb() */
331 static inline unsigned int send_pcb_slow(unsigned int base_addr, unsigned char byte)
332 {
333         unsigned long timeout;
334         outb_command(byte, base_addr);
335         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
336                 if (inb_status(base_addr) & HCRE)
337                         return FALSE;
338         }
339         printk(KERN_WARNING "3c505: send_pcb_slow timed out\n");
340         return TRUE;
341 }
342
343 static inline unsigned int send_pcb_fast(unsigned int base_addr, unsigned char byte)
344 {
345         unsigned int timeout;
346         outb_command(byte, base_addr);
347         for (timeout = 0; timeout < 40000; timeout++) {
348                 if (inb_status(base_addr) & HCRE)
349                         return FALSE;
350         }
351         printk(KERN_WARNING "3c505: send_pcb_fast timed out\n");
352         return TRUE;
353 }
354
355 /* Check to see if the receiver needs restarting, and kick it if so */
356 static inline void prime_rx(struct net_device *dev)
357 {
358         elp_device *adapter = dev->priv;
359         while (adapter->rx_active < ELP_RX_PCBS && netif_running(dev)) {
360                 if (!start_receive(dev, &adapter->itx_pcb))
361                         break;
362         }
363 }
364
365 /*****************************************************************
366  *
367  * send_pcb
368  *   Send a PCB to the adapter.
369  *
370  *      output byte to command reg  --<--+
371  *      wait until HCRE is non zero      |
372  *      loop until all bytes sent   -->--+
373  *      set HSF1 and HSF2 to 1
374  *      output pcb length
375  *      wait until ASF give ACK or NAK
376  *      set HSF1 and HSF2 to 0
377  *
378  *****************************************************************/
379
380 /* This can be quite slow -- the adapter is allowed to take up to 40ms
381  * to respond to the initial interrupt.
382  *
383  * We run initially with interrupts turned on, but with a semaphore set
384  * so that nobody tries to re-enter this code.  Once the first byte has
385  * gone through, we turn interrupts off and then send the others (the
386  * timeout is reduced to 500us).
387  */
388
389 static int send_pcb(struct net_device *dev, pcb_struct * pcb)
390 {
391         int i;
392         unsigned long timeout;
393         elp_device *adapter = dev->priv;
394         unsigned long flags;
395
396         check_3c505_dma(dev);
397
398         if (adapter->dmaing && adapter->current_dma.direction == 0)
399                 return FALSE;
400
401         /* Avoid contention */
402         if (test_and_set_bit(1, &adapter->send_pcb_semaphore)) {
403                 if (elp_debug >= 3) {
404                         printk(KERN_DEBUG "%s: send_pcb entered while threaded\n", dev->name);
405                 }
406                 return FALSE;
407         }
408         /*
409          * load each byte into the command register and
410          * wait for the HCRE bit to indicate the adapter
411          * had read the byte
412          */
413         set_hsf(dev, 0);
414
415         if (send_pcb_slow(dev->base_addr, pcb->command))
416                 goto abort;
417
418         spin_lock_irqsave(&adapter->lock, flags);
419
420         if (send_pcb_fast(dev->base_addr, pcb->length))
421                 goto sti_abort;
422
423         for (i = 0; i < pcb->length; i++) {
424                 if (send_pcb_fast(dev->base_addr, pcb->data.raw[i]))
425                         goto sti_abort;
426         }
427
428         outb_control(adapter->hcr_val | 3, dev);        /* signal end of PCB */
429         outb_command(2 + pcb->length, dev->base_addr);
430
431         /* now wait for the acknowledgement */
432         spin_unlock_irqrestore(&adapter->lock, flags);
433
434         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
435                 switch (GET_ASF(dev->base_addr)) {
436                 case ASF_PCB_ACK:
437                         adapter->send_pcb_semaphore = 0;
438                         return TRUE;
439
440                 case ASF_PCB_NAK:
441 #ifdef ELP_DEBUG
442                         printk(KERN_DEBUG "%s: send_pcb got NAK\n", dev->name);
443 #endif
444                         goto abort;
445                 }
446         }
447
448         if (elp_debug >= 1)
449                 printk(KERN_DEBUG "%s: timeout waiting for PCB acknowledge (status %02x)\n", dev->name, inb_status(dev->base_addr));
450         goto abort;
451
452       sti_abort:
453         spin_unlock_irqrestore(&adapter->lock, flags);
454       abort:
455         adapter->send_pcb_semaphore = 0;
456         return FALSE;
457 }
458
459
460 /*****************************************************************
461  *
462  * receive_pcb
463  *   Read a PCB from the adapter
464  *
465  *      wait for ACRF to be non-zero        ---<---+
466  *      input a byte                               |
467  *      if ASF1 and ASF2 were not both one         |
468  *              before byte was read, loop      --->---+
469  *      set HSF1 and HSF2 for ack
470  *
471  *****************************************************************/
472
473 static int receive_pcb(struct net_device *dev, pcb_struct * pcb)
474 {
475         int i, j;
476         int total_length;
477         int stat;
478         unsigned long timeout;
479         unsigned long flags;
480
481         elp_device *adapter = dev->priv;
482
483         set_hsf(dev, 0);
484
485         /* get the command code */
486         timeout = jiffies + 2*HZ/100;
487         while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
488         if (time_after_eq(jiffies, timeout)) {
489                 TIMEOUT_MSG(__LINE__);
490                 return FALSE;
491         }
492         pcb->command = inb_command(dev->base_addr);
493
494         /* read the data length */
495         timeout = jiffies + 3*HZ/100;
496         while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
497         if (time_after_eq(jiffies, timeout)) {
498                 TIMEOUT_MSG(__LINE__);
499                 printk(KERN_INFO "%s: status %02x\n", dev->name, stat);
500                 return FALSE;
501         }
502         pcb->length = inb_command(dev->base_addr);
503
504         if (pcb->length > MAX_PCB_DATA) {
505                 INVALID_PCB_MSG(pcb->length);
506                 adapter_reset(dev);
507                 return FALSE;
508         }
509         /* read the data */
510         spin_lock_irqsave(&adapter->lock, flags);
511         i = 0;
512         do {
513                 j = 0;
514                 while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000);
515                 pcb->data.raw[i++] = inb_command(dev->base_addr);
516                 if (i > MAX_PCB_DATA)
517                         INVALID_PCB_MSG(i);
518         } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000);
519         spin_unlock_irqrestore(&adapter->lock, flags);
520         if (j >= 20000) {
521                 TIMEOUT_MSG(__LINE__);
522                 return FALSE;
523         }
524         /* woops, the last "data" byte was really the length! */
525         total_length = pcb->data.raw[--i];
526
527         /* safety check total length vs data length */
528         if (total_length != (pcb->length + 2)) {
529                 if (elp_debug >= 2)
530                         printk(KERN_WARNING "%s: mangled PCB received\n", dev->name);
531                 set_hsf(dev, HSF_PCB_NAK);
532                 return FALSE;
533         }
534
535         if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
536                 if (test_and_set_bit(0, (void *) &adapter->busy)) {
537                         if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
538                                 set_hsf(dev, HSF_PCB_NAK);
539                                 printk(KERN_WARNING "%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
540                                 pcb->command = 0;
541                                 return TRUE;
542                         } else {
543                                 pcb->command = 0xff;
544                         }
545                 }
546         }
547         set_hsf(dev, HSF_PCB_ACK);
548         return TRUE;
549 }
550
551 /******************************************************
552  *
553  *  queue a receive command on the adapter so we will get an
554  *  interrupt when a packet is received.
555  *
556  ******************************************************/
557
558 static int start_receive(struct net_device *dev, pcb_struct * tx_pcb)
559 {
560         int status;
561         elp_device *adapter = dev->priv;
562
563         if (elp_debug >= 3)
564                 printk(KERN_DEBUG "%s: restarting receiver\n", dev->name);
565         tx_pcb->command = CMD_RECEIVE_PACKET;
566         tx_pcb->length = sizeof(struct Rcv_pkt);
567         tx_pcb->data.rcv_pkt.buf_seg
568             = tx_pcb->data.rcv_pkt.buf_ofs = 0;         /* Unused */
569         tx_pcb->data.rcv_pkt.buf_len = 1600;
570         tx_pcb->data.rcv_pkt.timeout = 0;       /* set timeout to zero */
571         status = send_pcb(dev, tx_pcb);
572         if (status)
573                 adapter->rx_active++;
574         return status;
575 }
576
577 /******************************************************
578  *
579  * extract a packet from the adapter
580  * this routine is only called from within the interrupt
581  * service routine, so no cli/sti calls are needed
582  * note that the length is always assumed to be even
583  *
584  ******************************************************/
585
586 static void receive_packet(struct net_device *dev, int len)
587 {
588         int rlen;
589         elp_device *adapter = dev->priv;
590         void *target;
591         struct sk_buff *skb;
592         unsigned long flags;
593
594         rlen = (len + 1) & ~1;
595         skb = dev_alloc_skb(rlen + 2);
596
597         if (!skb) {
598                 printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
599                 target = adapter->dma_buffer;
600                 adapter->current_dma.target = NULL;
601                 /* FIXME: stats */
602                 return;
603         }
604
605         skb_reserve(skb, 2);
606         target = skb_put(skb, rlen);
607         if ((unsigned long)(target + rlen) >= MAX_DMA_ADDRESS) {
608                 adapter->current_dma.target = target;
609                 target = adapter->dma_buffer;
610         } else {
611                 adapter->current_dma.target = NULL;
612         }
613
614         /* if this happens, we die */
615         if (test_and_set_bit(0, (void *) &adapter->dmaing))
616                 printk(KERN_ERR "%s: rx blocked, DMA in progress, dir %d\n", dev->name, adapter->current_dma.direction);
617
618         skb->dev = dev;
619         adapter->current_dma.direction = 0;
620         adapter->current_dma.length = rlen;
621         adapter->current_dma.skb = skb;
622         adapter->current_dma.start_time = jiffies;
623
624         outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);
625
626         flags=claim_dma_lock();
627         disable_dma(dev->dma);
628         clear_dma_ff(dev->dma);
629         set_dma_mode(dev->dma, 0x04);   /* dma read */
630         set_dma_addr(dev->dma, isa_virt_to_bus(target));
631         set_dma_count(dev->dma, rlen);
632         enable_dma(dev->dma);
633         release_dma_lock(flags);
634
635         if (elp_debug >= 3) {
636                 printk(KERN_DEBUG "%s: rx DMA transfer started\n", dev->name);
637         }
638
639         if (adapter->rx_active)
640                 adapter->rx_active--;
641
642         if (!adapter->busy)
643                 printk(KERN_WARNING "%s: receive_packet called, busy not set.\n", dev->name);
644 }
645
646 /******************************************************
647  *
648  * interrupt handler
649  *
650  ******************************************************/
651
652 static irqreturn_t elp_interrupt(int irq, void *dev_id)
653 {
654         int len;
655         int dlen;
656         int icount = 0;
657         struct net_device *dev;
658         elp_device *adapter;
659         unsigned long timeout;
660
661         dev = dev_id;
662         adapter = (elp_device *) dev->priv;
663
664         spin_lock(&adapter->lock);
665
666         do {
667                 /*
668                  * has a DMA transfer finished?
669                  */
670                 if (inb_status(dev->base_addr) & DONE) {
671                         if (!adapter->dmaing) {
672                                 printk(KERN_WARNING "%s: phantom DMA completed\n", dev->name);
673                         }
674                         if (elp_debug >= 3) {
675                                 printk(KERN_DEBUG "%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
676                         }
677
678                         outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
679                         if (adapter->current_dma.direction) {
680                                 dev_kfree_skb_irq(adapter->current_dma.skb);
681                         } else {
682                                 struct sk_buff *skb = adapter->current_dma.skb;
683                                 if (skb) {
684                                         if (adapter->current_dma.target) {
685                                         /* have already done the skb_put() */
686                                         memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
687                                         }
688                                         skb->protocol = eth_type_trans(skb,dev);
689                                         adapter->stats.rx_bytes += skb->len;
690                                         netif_rx(skb);
691                                         dev->last_rx = jiffies;
692                                 }
693                         }
694                         adapter->dmaing = 0;
695                         if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
696                                 int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
697                                 adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
698                                 if (elp_debug >= 2)
699                                         printk(KERN_DEBUG "%s: receiving backlogged packet (%d)\n", dev->name, t);
700                                 receive_packet(dev, t);
701                         } else {
702                                 adapter->busy = 0;
703                         }
704                 } else {
705                         /* has one timed out? */
706                         check_3c505_dma(dev);
707                 }
708
709                 /*
710                  * receive a PCB from the adapter
711                  */
712                 timeout = jiffies + 3*HZ/100;
713                 while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
714                         if (receive_pcb(dev, &adapter->irx_pcb)) {
715                                 switch (adapter->irx_pcb.command)
716                                 {
717                                 case 0:
718                                         break;
719                                         /*
720                                          * received a packet - this must be handled fast
721                                          */
722                                 case 0xff:
723                                 case CMD_RECEIVE_PACKET_COMPLETE:
724                                         /* if the device isn't open, don't pass packets up the stack */
725                                         if (!netif_running(dev))
726                                                 break;
727                                         len = adapter->irx_pcb.data.rcv_resp.pkt_len;
728                                         dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
729                                         if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
730                                                 printk(KERN_ERR "%s: interrupt - packet not received correctly\n", dev->name);
731                                         } else {
732                                                 if (elp_debug >= 3) {
733                                                         printk(KERN_DEBUG "%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
734                                                 }
735                                                 if (adapter->irx_pcb.command == 0xff) {
736                                                         if (elp_debug >= 2)
737                                                                 printk(KERN_DEBUG "%s: adding packet to backlog (len = %d)\n", dev->name, dlen);
738                                                         adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
739                                                         adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
740                                                 } else {
741                                                         receive_packet(dev, dlen);
742                                                 }
743                                                 if (elp_debug >= 3)
744                                                         printk(KERN_DEBUG "%s: packet received\n", dev->name);
745                                         }
746                                         break;
747
748                                         /*
749                                          * 82586 configured correctly
750                                          */
751                                 case CMD_CONFIGURE_82586_RESPONSE:
752                                         adapter->got[CMD_CONFIGURE_82586] = 1;
753                                         if (elp_debug >= 3)
754                                                 printk(KERN_DEBUG "%s: interrupt - configure response received\n", dev->name);
755                                         break;
756
757                                         /*
758                                          * Adapter memory configuration
759                                          */
760                                 case CMD_CONFIGURE_ADAPTER_RESPONSE:
761                                         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
762                                         if (elp_debug >= 3)
763                                                 printk(KERN_DEBUG "%s: Adapter memory configuration %s.\n", dev->name,
764                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
765                                         break;
766
767                                         /*
768                                          * Multicast list loading
769                                          */
770                                 case CMD_LOAD_MULTICAST_RESPONSE:
771                                         adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
772                                         if (elp_debug >= 3)
773                                                 printk(KERN_DEBUG "%s: Multicast address list loading %s.\n", dev->name,
774                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
775                                         break;
776
777                                         /*
778                                          * Station address setting
779                                          */
780                                 case CMD_SET_ADDRESS_RESPONSE:
781                                         adapter->got[CMD_SET_STATION_ADDRESS] = 1;
782                                         if (elp_debug >= 3)
783                                                 printk(KERN_DEBUG "%s: Ethernet address setting %s.\n", dev->name,
784                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
785                                         break;
786
787
788                                         /*
789                                          * received board statistics
790                                          */
791                                 case CMD_NETWORK_STATISTICS_RESPONSE:
792                                         adapter->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
793                                         adapter->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
794                                         adapter->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
795                                         adapter->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
796                                         adapter->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
797                                         adapter->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
798                                         adapter->got[CMD_NETWORK_STATISTICS] = 1;
799                                         if (elp_debug >= 3)
800                                                 printk(KERN_DEBUG "%s: interrupt - statistics response received\n", dev->name);
801                                         break;
802
803                                         /*
804                                          * sent a packet
805                                          */
806                                 case CMD_TRANSMIT_PACKET_COMPLETE:
807                                         if (elp_debug >= 3)
808                                                 printk(KERN_DEBUG "%s: interrupt - packet sent\n", dev->name);
809                                         if (!netif_running(dev))
810                                                 break;
811                                         switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
812                                         case 0xffff:
813                                                 adapter->stats.tx_aborted_errors++;
814                                                 printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name);
815                                                 break;
816                                         case 0xfffe:
817                                                 adapter->stats.tx_fifo_errors++;
818                                                 printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name);
819                                                 break;
820                                         }
821                                         netif_wake_queue(dev);
822                                         break;
823
824                                         /*
825                                          * some unknown PCB
826                                          */
827                                 default:
828                                         printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
829                                         break;
830                                 }
831                         } else {
832                                 printk(KERN_WARNING "%s: failed to read PCB on interrupt\n", dev->name);
833                                 adapter_reset(dev);
834                         }
835                 }
836
837         } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
838
839         prime_rx(dev);
840
841         /*
842          * indicate no longer in interrupt routine
843          */
844         spin_unlock(&adapter->lock);
845         return IRQ_HANDLED;
846 }
847
848
849 /******************************************************
850  *
851  * open the board
852  *
853  ******************************************************/
854
855 static int elp_open(struct net_device *dev)
856 {
857         elp_device *adapter;
858         int retval;
859
860         adapter = dev->priv;
861
862         if (elp_debug >= 3)
863                 printk(KERN_DEBUG "%s: request to open device\n", dev->name);
864
865         /*
866          * make sure we actually found the device
867          */
868         if (adapter == NULL) {
869                 printk(KERN_ERR "%s: Opening a non-existent physical device\n", dev->name);
870                 return -EAGAIN;
871         }
872         /*
873          * disable interrupts on the board
874          */
875         outb_control(0, dev);
876
877         /*
878          * clear any pending interrupts
879          */
880         inb_command(dev->base_addr);
881         adapter_reset(dev);
882
883         /*
884          * no receive PCBs active
885          */
886         adapter->rx_active = 0;
887
888         adapter->busy = 0;
889         adapter->send_pcb_semaphore = 0;
890         adapter->rx_backlog.in = 0;
891         adapter->rx_backlog.out = 0;
892
893         spin_lock_init(&adapter->lock);
894
895         /*
896          * install our interrupt service routine
897          */
898         if ((retval = request_irq(dev->irq, &elp_interrupt, 0, dev->name, dev))) {
899                 printk(KERN_ERR "%s: could not allocate IRQ%d\n", dev->name, dev->irq);
900                 return retval;
901         }
902         if ((retval = request_dma(dev->dma, dev->name))) {
903                 free_irq(dev->irq, dev);
904                 printk(KERN_ERR "%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
905                 return retval;
906         }
907         adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
908         if (!adapter->dma_buffer) {
909                 printk(KERN_ERR "%s: could not allocate DMA buffer\n", dev->name);
910                 free_dma(dev->dma);
911                 free_irq(dev->irq, dev);
912                 return -ENOMEM;
913         }
914         adapter->dmaing = 0;
915
916         /*
917          * enable interrupts on the board
918          */
919         outb_control(CMDE, dev);
920
921         /*
922          * configure adapter memory: we need 10 multicast addresses, default==0
923          */
924         if (elp_debug >= 3)
925                 printk(KERN_DEBUG "%s: sending 3c505 memory configuration command\n", dev->name);
926         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
927         adapter->tx_pcb.data.memconf.cmd_q = 10;
928         adapter->tx_pcb.data.memconf.rcv_q = 20;
929         adapter->tx_pcb.data.memconf.mcast = 10;
930         adapter->tx_pcb.data.memconf.frame = 20;
931         adapter->tx_pcb.data.memconf.rcv_b = 20;
932         adapter->tx_pcb.data.memconf.progs = 0;
933         adapter->tx_pcb.length = sizeof(struct Memconf);
934         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
935         if (!send_pcb(dev, &adapter->tx_pcb))
936                 printk(KERN_ERR "%s: couldn't send memory configuration command\n", dev->name);
937         else {
938                 unsigned long timeout = jiffies + TIMEOUT;
939                 while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
940                 if (time_after_eq(jiffies, timeout))
941                         TIMEOUT_MSG(__LINE__);
942         }
943
944
945         /*
946          * configure adapter to receive broadcast messages and wait for response
947          */
948         if (elp_debug >= 3)
949                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
950         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
951         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
952         adapter->tx_pcb.length = 2;
953         adapter->got[CMD_CONFIGURE_82586] = 0;
954         if (!send_pcb(dev, &adapter->tx_pcb))
955                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
956         else {
957                 unsigned long timeout = jiffies + TIMEOUT;
958                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
959                 if (time_after_eq(jiffies, timeout))
960                         TIMEOUT_MSG(__LINE__);
961         }
962
963         /* enable burst-mode DMA */
964         /* outb(0x1, dev->base_addr + PORT_AUXDMA); */
965
966         /*
967          * queue receive commands to provide buffering
968          */
969         prime_rx(dev);
970         if (elp_debug >= 3)
971                 printk(KERN_DEBUG "%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
972
973         /*
974          * device is now officially open!
975          */
976
977         netif_start_queue(dev);
978         return 0;
979 }
980
981
982 /******************************************************
983  *
984  * send a packet to the adapter
985  *
986  ******************************************************/
987
988 static int send_packet(struct net_device *dev, struct sk_buff *skb)
989 {
990         elp_device *adapter = dev->priv;
991         unsigned long target;
992         unsigned long flags;
993
994         /*
995          * make sure the length is even and no shorter than 60 bytes
996          */
997         unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
998
999         if (test_and_set_bit(0, (void *) &adapter->busy)) {
1000                 if (elp_debug >= 2)
1001                         printk(KERN_DEBUG "%s: transmit blocked\n", dev->name);
1002                 return FALSE;
1003         }
1004
1005         adapter->stats.tx_bytes += nlen;
1006
1007         /*
1008          * send the adapter a transmit packet command. Ignore segment and offset
1009          * and make sure the length is even
1010          */
1011         adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
1012         adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
1013         adapter->tx_pcb.data.xmit_pkt.buf_ofs
1014             = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0;        /* Unused */
1015         adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;
1016
1017         if (!send_pcb(dev, &adapter->tx_pcb)) {
1018                 adapter->busy = 0;
1019                 return FALSE;
1020         }
1021         /* if this happens, we die */
1022         if (test_and_set_bit(0, (void *) &adapter->dmaing))
1023                 printk(KERN_DEBUG "%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
1024
1025         adapter->current_dma.direction = 1;
1026         adapter->current_dma.start_time = jiffies;
1027
1028         if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) {
1029                 memcpy(adapter->dma_buffer, skb->data, nlen);
1030                 memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len);
1031                 target = isa_virt_to_bus(adapter->dma_buffer);
1032         }
1033         else {
1034                 target = isa_virt_to_bus(skb->data);
1035         }
1036         adapter->current_dma.skb = skb;
1037
1038         flags=claim_dma_lock();
1039         disable_dma(dev->dma);
1040         clear_dma_ff(dev->dma);
1041         set_dma_mode(dev->dma, 0x48);   /* dma memory -> io */
1042         set_dma_addr(dev->dma, target);
1043         set_dma_count(dev->dma, nlen);
1044         outb_control(adapter->hcr_val | DMAE | TCEN, dev);
1045         enable_dma(dev->dma);
1046         release_dma_lock(flags);
1047
1048         if (elp_debug >= 3)
1049                 printk(KERN_DEBUG "%s: DMA transfer started\n", dev->name);
1050
1051         return TRUE;
1052 }
1053
1054 /*
1055  *      The upper layer thinks we timed out
1056  */
1057
1058 static void elp_timeout(struct net_device *dev)
1059 {
1060         elp_device *adapter = dev->priv;
1061         int stat;
1062
1063         stat = inb_status(dev->base_addr);
1064         printk(KERN_WARNING "%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
1065         if (elp_debug >= 1)
1066                 printk(KERN_DEBUG "%s: status %#02x\n", dev->name, stat);
1067         dev->trans_start = jiffies;
1068         adapter->stats.tx_dropped++;
1069         netif_wake_queue(dev);
1070 }
1071
1072 /******************************************************
1073  *
1074  * start the transmitter
1075  *    return 0 if sent OK, else return 1
1076  *
1077  ******************************************************/
1078
1079 static int elp_start_xmit(struct sk_buff *skb, struct net_device *dev)
1080 {
1081         unsigned long flags;
1082         elp_device *adapter = dev->priv;
1083
1084         spin_lock_irqsave(&adapter->lock, flags);
1085         check_3c505_dma(dev);
1086
1087         if (elp_debug >= 3)
1088                 printk(KERN_DEBUG "%s: request to send packet of length %d\n", dev->name, (int) skb->len);
1089
1090         netif_stop_queue(dev);
1091
1092         /*
1093          * send the packet at skb->data for skb->len
1094          */
1095         if (!send_packet(dev, skb)) {
1096                 if (elp_debug >= 2) {
1097                         printk(KERN_DEBUG "%s: failed to transmit packet\n", dev->name);
1098                 }
1099                 spin_unlock_irqrestore(&adapter->lock, flags);
1100                 return 1;
1101         }
1102         if (elp_debug >= 3)
1103                 printk(KERN_DEBUG "%s: packet of length %d sent\n", dev->name, (int) skb->len);
1104
1105         /*
1106          * start the transmit timeout
1107          */
1108         dev->trans_start = jiffies;
1109
1110         prime_rx(dev);
1111         spin_unlock_irqrestore(&adapter->lock, flags);
1112         netif_start_queue(dev);
1113         return 0;
1114 }
1115
1116 /******************************************************
1117  *
1118  * return statistics on the board
1119  *
1120  ******************************************************/
1121
1122 static struct net_device_stats *elp_get_stats(struct net_device *dev)
1123 {
1124         elp_device *adapter = (elp_device *) dev->priv;
1125
1126         if (elp_debug >= 3)
1127                 printk(KERN_DEBUG "%s: request for stats\n", dev->name);
1128
1129         /* If the device is closed, just return the latest stats we have,
1130            - we cannot ask from the adapter without interrupts */
1131         if (!netif_running(dev))
1132                 return &adapter->stats;
1133
1134         /* send a get statistics command to the board */
1135         adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
1136         adapter->tx_pcb.length = 0;
1137         adapter->got[CMD_NETWORK_STATISTICS] = 0;
1138         if (!send_pcb(dev, &adapter->tx_pcb))
1139                 printk(KERN_ERR "%s: couldn't send get statistics command\n", dev->name);
1140         else {
1141                 unsigned long timeout = jiffies + TIMEOUT;
1142                 while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && time_before(jiffies, timeout));
1143                 if (time_after_eq(jiffies, timeout)) {
1144                         TIMEOUT_MSG(__LINE__);
1145                         return &adapter->stats;
1146                 }
1147         }
1148
1149         /* statistics are now up to date */
1150         return &adapter->stats;
1151 }
1152
1153
1154 static void netdev_get_drvinfo(struct net_device *dev,
1155                                struct ethtool_drvinfo *info)
1156 {
1157         strcpy(info->driver, DRV_NAME);
1158         strcpy(info->version, DRV_VERSION);
1159         sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
1160 }
1161
1162 static u32 netdev_get_msglevel(struct net_device *dev)
1163 {
1164         return debug;
1165 }
1166
1167 static void netdev_set_msglevel(struct net_device *dev, u32 level)
1168 {
1169         debug = level;
1170 }
1171
1172 static const struct ethtool_ops netdev_ethtool_ops = {
1173         .get_drvinfo            = netdev_get_drvinfo,
1174         .get_msglevel           = netdev_get_msglevel,
1175         .set_msglevel           = netdev_set_msglevel,
1176 };
1177
1178 /******************************************************
1179  *
1180  * close the board
1181  *
1182  ******************************************************/
1183
1184 static int elp_close(struct net_device *dev)
1185 {
1186         elp_device *adapter;
1187
1188         adapter = dev->priv;
1189
1190         if (elp_debug >= 3)
1191                 printk(KERN_DEBUG "%s: request to close device\n", dev->name);
1192
1193         netif_stop_queue(dev);
1194
1195         /* Someone may request the device statistic information even when
1196          * the interface is closed. The following will update the statistics
1197          * structure in the driver, so we'll be able to give current statistics.
1198          */
1199         (void) elp_get_stats(dev);
1200
1201         /*
1202          * disable interrupts on the board
1203          */
1204         outb_control(0, dev);
1205
1206         /*
1207          * release the IRQ
1208          */
1209         free_irq(dev->irq, dev);
1210
1211         free_dma(dev->dma);
1212         free_pages((unsigned long) adapter->dma_buffer, get_order(DMA_BUFFER_SIZE));
1213
1214         return 0;
1215 }
1216
1217
1218 /************************************************************
1219  *
1220  * Set multicast list
1221  * num_addrs==0: clear mc_list
1222  * num_addrs==-1: set promiscuous mode
1223  * num_addrs>0: set mc_list
1224  *
1225  ************************************************************/
1226
1227 static void elp_set_mc_list(struct net_device *dev)
1228 {
1229         elp_device *adapter = (elp_device *) dev->priv;
1230         struct dev_mc_list *dmi = dev->mc_list;
1231         int i;
1232         unsigned long flags;
1233
1234         if (elp_debug >= 3)
1235                 printk(KERN_DEBUG "%s: request to set multicast list\n", dev->name);
1236
1237         spin_lock_irqsave(&adapter->lock, flags);
1238
1239         if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1240                 /* send a "load multicast list" command to the board, max 10 addrs/cmd */
1241                 /* if num_addrs==0 the list will be cleared */
1242                 adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
1243                 adapter->tx_pcb.length = 6 * dev->mc_count;
1244                 for (i = 0; i < dev->mc_count; i++) {
1245                         memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
1246                         dmi = dmi->next;
1247                 }
1248                 adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
1249                 if (!send_pcb(dev, &adapter->tx_pcb))
1250                         printk(KERN_ERR "%s: couldn't send set_multicast command\n", dev->name);
1251                 else {
1252                         unsigned long timeout = jiffies + TIMEOUT;
1253                         while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && time_before(jiffies, timeout));
1254                         if (time_after_eq(jiffies, timeout)) {
1255                                 TIMEOUT_MSG(__LINE__);
1256                         }
1257                 }
1258                 if (dev->mc_count)
1259                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
1260                 else            /* num_addrs == 0 */
1261                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1262         } else
1263                 adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
1264         /*
1265          * configure adapter to receive messages (as specified above)
1266          * and wait for response
1267          */
1268         if (elp_debug >= 3)
1269                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
1270         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1271         adapter->tx_pcb.length = 2;
1272         adapter->got[CMD_CONFIGURE_82586] = 0;
1273         if (!send_pcb(dev, &adapter->tx_pcb))
1274         {
1275                 spin_unlock_irqrestore(&adapter->lock, flags);
1276                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
1277         }
1278         else {
1279                 unsigned long timeout = jiffies + TIMEOUT;
1280                 spin_unlock_irqrestore(&adapter->lock, flags);
1281                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
1282                 if (time_after_eq(jiffies, timeout))
1283                         TIMEOUT_MSG(__LINE__);
1284         }
1285 }
1286
1287 /************************************************************
1288  *
1289  * A couple of tests to see if there's 3C505 or not
1290  * Called only by elp_autodetect
1291  ************************************************************/
1292
1293 static int __init elp_sense(struct net_device *dev)
1294 {
1295         int addr = dev->base_addr;
1296         const char *name = dev->name;
1297         byte orig_HSR;
1298
1299         if (!request_region(addr, ELP_IO_EXTENT, "3c505"))
1300                 return -ENODEV;
1301
1302         orig_HSR = inb_status(addr);
1303
1304         if (elp_debug > 0)
1305                 printk(search_msg, name, addr);
1306
1307         if (orig_HSR == 0xff) {
1308                 if (elp_debug > 0)
1309                         printk(notfound_msg, 1);
1310                 goto out;
1311         }
1312
1313         /* Wait for a while; the adapter may still be booting up */
1314         if (elp_debug > 0)
1315                 printk(stilllooking_msg);
1316
1317         if (orig_HSR & DIR) {
1318                 /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
1319                 outb(0, dev->base_addr + PORT_CONTROL);
1320                 msleep(300);
1321                 if (inb_status(addr) & DIR) {
1322                         if (elp_debug > 0)
1323                                 printk(notfound_msg, 2);
1324                         goto out;
1325                 }
1326         } else {
1327                 /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
1328                 outb(DIR, dev->base_addr + PORT_CONTROL);
1329                 msleep(300);
1330                 if (!(inb_status(addr) & DIR)) {
1331                         if (elp_debug > 0)
1332                                 printk(notfound_msg, 3);
1333                         goto out;
1334                 }
1335         }
1336         /*
1337          * It certainly looks like a 3c505.
1338          */
1339         if (elp_debug > 0)
1340                 printk(found_msg);
1341
1342         return 0;
1343 out:
1344         release_region(addr, ELP_IO_EXTENT);
1345         return -ENODEV;
1346 }
1347
1348 /*************************************************************
1349  *
1350  * Search through addr_list[] and try to find a 3C505
1351  * Called only by eplus_probe
1352  *************************************************************/
1353
1354 static int __init elp_autodetect(struct net_device *dev)
1355 {
1356         int idx = 0;
1357
1358         /* if base address set, then only check that address
1359            otherwise, run through the table */
1360         if (dev->base_addr != 0) {      /* dev->base_addr == 0 ==> plain autodetect */
1361                 if (elp_sense(dev) == 0)
1362                         return dev->base_addr;
1363         } else
1364                 while ((dev->base_addr = addr_list[idx++])) {
1365                         if (elp_sense(dev) == 0)
1366                                 return dev->base_addr;
1367                 }
1368
1369         /* could not find an adapter */
1370         if (elp_debug > 0)
1371                 printk(couldnot_msg, dev->name);
1372
1373         return 0;               /* Because of this, the layer above will return -ENODEV */
1374 }
1375
1376
1377 /******************************************************
1378  *
1379  * probe for an Etherlink Plus board at the specified address
1380  *
1381  ******************************************************/
1382
1383 /* There are three situations we need to be able to detect here:
1384
1385  *  a) the card is idle
1386  *  b) the card is still booting up
1387  *  c) the card is stuck in a strange state (some DOS drivers do this)
1388  *
1389  * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
1390  * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
1391  * loop round, and hope for the best.
1392  *
1393  * This is all very unpleasant, but hopefully avoids the problems with the old
1394  * probe code (which had a 15-second delay if the card was idle, and didn't
1395  * work at all if it was in a weird state).
1396  */
1397
1398 static int __init elplus_setup(struct net_device *dev)
1399 {
1400         elp_device *adapter = dev->priv;
1401         int i, tries, tries1, okay;
1402         unsigned long timeout;
1403         unsigned long cookie = 0;
1404         int err = -ENODEV;
1405
1406         SET_MODULE_OWNER(dev);
1407
1408         /*
1409          *  setup adapter structure
1410          */
1411
1412         dev->base_addr = elp_autodetect(dev);
1413         if (!dev->base_addr)
1414                 return -ENODEV;
1415
1416         adapter->send_pcb_semaphore = 0;
1417
1418         for (tries1 = 0; tries1 < 3; tries1++) {
1419                 outb_control((adapter->hcr_val | CMDE) & ~DIR, dev);
1420                 /* First try to write just one byte, to see if the card is
1421                  * responding at all normally.
1422                  */
1423                 timeout = jiffies + 5*HZ/100;
1424                 okay = 0;
1425                 while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1426                 if ((inb_status(dev->base_addr) & HCRE)) {
1427                         outb_command(0, dev->base_addr);        /* send a spurious byte */
1428                         timeout = jiffies + 5*HZ/100;
1429                         while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1430                         if (inb_status(dev->base_addr) & HCRE)
1431                                 okay = 1;
1432                 }
1433                 if (!okay) {
1434                         /* Nope, it's ignoring the command register.  This means that
1435                          * either it's still booting up, or it's died.
1436                          */
1437                         printk(KERN_ERR "%s: command register wouldn't drain, ", dev->name);
1438                         if ((inb_status(dev->base_addr) & 7) == 3) {
1439                                 /* If the adapter status is 3, it *could* still be booting.
1440                                  * Give it the benefit of the doubt for 10 seconds.
1441                                  */
1442                                 printk("assuming 3c505 still starting\n");
1443                                 timeout = jiffies + 10*HZ;
1444                                 while (time_before(jiffies, timeout) && (inb_status(dev->base_addr) & 7));
1445                                 if (inb_status(dev->base_addr) & 7) {
1446                                         printk(KERN_ERR "%s: 3c505 failed to start\n", dev->name);
1447                                 } else {
1448                                         okay = 1;  /* It started */
1449                                 }
1450                         } else {
1451                                 /* Otherwise, it must just be in a strange
1452                                  * state.  We probably need to kick it.
1453                                  */
1454                                 printk("3c505 is sulking\n");
1455                         }
1456                 }
1457                 for (tries = 0; tries < 5 && okay; tries++) {
1458
1459                         /*
1460                          * Try to set the Ethernet address, to make sure that the board
1461                          * is working.
1462                          */
1463                         adapter->tx_pcb.command = CMD_STATION_ADDRESS;
1464                         adapter->tx_pcb.length = 0;
1465                         cookie = probe_irq_on();
1466                         if (!send_pcb(dev, &adapter->tx_pcb)) {
1467                                 printk(KERN_ERR "%s: could not send first PCB\n", dev->name);
1468                                 probe_irq_off(cookie);
1469                                 continue;
1470                         }
1471                         if (!receive_pcb(dev, &adapter->rx_pcb)) {
1472                                 printk(KERN_ERR "%s: could not read first PCB\n", dev->name);
1473                                 probe_irq_off(cookie);
1474                                 continue;
1475                         }
1476                         if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
1477                             (adapter->rx_pcb.length != 6)) {
1478                                 printk(KERN_ERR "%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
1479                                 probe_irq_off(cookie);
1480                                 continue;
1481                         }
1482                         goto okay;
1483                 }
1484                 /* It's broken.  Do a hard reset to re-initialise the board,
1485                  * and try again.
1486                  */
1487                 printk(KERN_INFO "%s: resetting adapter\n", dev->name);
1488                 outb_control(adapter->hcr_val | FLSH | ATTN, dev);
1489                 outb_control(adapter->hcr_val & ~(FLSH | ATTN), dev);
1490         }
1491         printk(KERN_ERR "%s: failed to initialise 3c505\n", dev->name);
1492         goto out;
1493
1494       okay:
1495         if (dev->irq) {         /* Is there a preset IRQ? */
1496                 int rpt = probe_irq_off(cookie);
1497                 if (dev->irq != rpt) {
1498                         printk(KERN_WARNING "%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
1499                 }
1500                 /* if dev->irq == probe_irq_off(cookie), all is well */
1501         } else                 /* No preset IRQ; just use what we can detect */
1502                 dev->irq = probe_irq_off(cookie);
1503         switch (dev->irq) {    /* Legal, sane? */
1504         case 0:
1505                 printk(KERN_ERR "%s: IRQ probe failed: check 3c505 jumpers.\n",
1506                        dev->name);
1507                 goto out;
1508         case 1:
1509         case 6:
1510         case 8:
1511         case 13:
1512                 printk(KERN_ERR "%s: Impossible IRQ %d reported by probe_irq_off().\n",
1513                        dev->name, dev->irq);
1514                        goto out;
1515         }
1516         /*
1517          *  Now we have the IRQ number so we can disable the interrupts from
1518          *  the board until the board is opened.
1519          */
1520         outb_control(adapter->hcr_val & ~CMDE, dev);
1521
1522         /*
1523          * copy Ethernet address into structure
1524          */
1525         for (i = 0; i < 6; i++)
1526                 dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
1527
1528         /* find a DMA channel */
1529         if (!dev->dma) {
1530                 if (dev->mem_start) {
1531                         dev->dma = dev->mem_start & 7;
1532                 }
1533                 else {
1534                         printk(KERN_WARNING "%s: warning, DMA channel not specified, using default\n", dev->name);
1535                         dev->dma = ELP_DMA;
1536                 }
1537         }
1538
1539         /*
1540          * print remainder of startup message
1541          */
1542         printk(KERN_INFO "%s: 3c505 at %#lx, irq %d, dma %d, ",
1543                dev->name, dev->base_addr, dev->irq, dev->dma);
1544         printk("addr %02x:%02x:%02x:%02x:%02x:%02x, ",
1545                dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1546                dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1547
1548         /*
1549          * read more information from the adapter
1550          */
1551
1552         adapter->tx_pcb.command = CMD_ADAPTER_INFO;
1553         adapter->tx_pcb.length = 0;
1554         if (!send_pcb(dev, &adapter->tx_pcb) ||
1555             !receive_pcb(dev, &adapter->rx_pcb) ||
1556             (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
1557             (adapter->rx_pcb.length != 10)) {
1558                 printk("not responding to second PCB\n");
1559         }
1560         printk("rev %d.%d, %dk\n", adapter->rx_pcb.data.info.major_vers, adapter->rx_pcb.data.info.minor_vers, adapter->rx_pcb.data.info.RAM_sz);
1561
1562         /*
1563          * reconfigure the adapter memory to better suit our purposes
1564          */
1565         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
1566         adapter->tx_pcb.length = 12;
1567         adapter->tx_pcb.data.memconf.cmd_q = 8;
1568         adapter->tx_pcb.data.memconf.rcv_q = 8;
1569         adapter->tx_pcb.data.memconf.mcast = 10;
1570         adapter->tx_pcb.data.memconf.frame = 10;
1571         adapter->tx_pcb.data.memconf.rcv_b = 10;
1572         adapter->tx_pcb.data.memconf.progs = 0;
1573         if (!send_pcb(dev, &adapter->tx_pcb) ||
1574             !receive_pcb(dev, &adapter->rx_pcb) ||
1575             (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
1576             (adapter->rx_pcb.length != 2)) {
1577                 printk(KERN_ERR "%s: could not configure adapter memory\n", dev->name);
1578         }
1579         if (adapter->rx_pcb.data.configure) {
1580                 printk(KERN_ERR "%s: adapter configuration failed\n", dev->name);
1581         }
1582
1583         dev->open = elp_open;                           /* local */
1584         dev->stop = elp_close;                          /* local */
1585         dev->get_stats = elp_get_stats;                 /* local */
1586         dev->hard_start_xmit = elp_start_xmit;          /* local */
1587         dev->tx_timeout = elp_timeout;                  /* local */
1588         dev->watchdog_timeo = 10*HZ;
1589         dev->set_multicast_list = elp_set_mc_list;      /* local */
1590         dev->ethtool_ops = &netdev_ethtool_ops;         /* local */
1591
1592         memset(&(adapter->stats), 0, sizeof(struct net_device_stats));
1593         dev->mem_start = dev->mem_end = 0;
1594
1595         err = register_netdev(dev);
1596         if (err)
1597                 goto out;
1598
1599         return 0;
1600 out:
1601         release_region(dev->base_addr, ELP_IO_EXTENT);
1602         return err;
1603 }
1604
1605 #ifndef MODULE
1606 struct net_device * __init elplus_probe(int unit)
1607 {
1608         struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1609         int err;
1610         if (!dev)
1611                 return ERR_PTR(-ENOMEM);
1612
1613         sprintf(dev->name, "eth%d", unit);
1614         netdev_boot_setup_check(dev);
1615
1616         err = elplus_setup(dev);
1617         if (err) {
1618                 free_netdev(dev);
1619                 return ERR_PTR(err);
1620         }
1621         return dev;
1622 }
1623
1624 #else
1625 static struct net_device *dev_3c505[ELP_MAX_CARDS];
1626 static int io[ELP_MAX_CARDS];
1627 static int irq[ELP_MAX_CARDS];
1628 static int dma[ELP_MAX_CARDS];
1629 module_param_array(io, int, NULL, 0);
1630 module_param_array(irq, int, NULL, 0);
1631 module_param_array(dma, int, NULL, 0);
1632 MODULE_PARM_DESC(io, "EtherLink Plus I/O base address(es)");
1633 MODULE_PARM_DESC(irq, "EtherLink Plus IRQ number(s) (assigned)");
1634 MODULE_PARM_DESC(dma, "EtherLink Plus DMA channel(s)");
1635
1636 int __init init_module(void)
1637 {
1638         int this_dev, found = 0;
1639
1640         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1641                 struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1642                 if (!dev)
1643                         break;
1644
1645                 dev->irq = irq[this_dev];
1646                 dev->base_addr = io[this_dev];
1647                 if (dma[this_dev]) {
1648                         dev->dma = dma[this_dev];
1649                 } else {
1650                         dev->dma = ELP_DMA;
1651                         printk(KERN_WARNING "3c505.c: warning, using default DMA channel,\n");
1652                 }
1653                 if (io[this_dev] == 0) {
1654                         if (this_dev) {
1655                                 free_netdev(dev);
1656                                 break;
1657                         }
1658                         printk(KERN_NOTICE "3c505.c: module autoprobe not recommended, give io=xx.\n");
1659                 }
1660                 if (elplus_setup(dev) != 0) {
1661                         printk(KERN_WARNING "3c505.c: Failed to register card at 0x%x.\n", io[this_dev]);
1662                         free_netdev(dev);
1663                         break;
1664                 }
1665                 dev_3c505[this_dev] = dev;
1666                 found++;
1667         }
1668         if (!found)
1669                 return -ENODEV;
1670         return 0;
1671 }
1672
1673 void cleanup_module(void)
1674 {
1675         int this_dev;
1676
1677         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1678                 struct net_device *dev = dev_3c505[this_dev];
1679                 if (dev) {
1680                         unregister_netdev(dev);
1681                         release_region(dev->base_addr, ELP_IO_EXTENT);
1682                         free_netdev(dev);
1683                 }
1684         }
1685 }
1686
1687 #endif                          /* MODULE */
1688 MODULE_LICENSE("GPL");