[SK_BUFF]: Introduce skb_copy_from_linear_data{_offset}
[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         adapter->current_dma.direction = 0;
619         adapter->current_dma.length = rlen;
620         adapter->current_dma.skb = skb;
621         adapter->current_dma.start_time = jiffies;
622
623         outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);
624
625         flags=claim_dma_lock();
626         disable_dma(dev->dma);
627         clear_dma_ff(dev->dma);
628         set_dma_mode(dev->dma, 0x04);   /* dma read */
629         set_dma_addr(dev->dma, isa_virt_to_bus(target));
630         set_dma_count(dev->dma, rlen);
631         enable_dma(dev->dma);
632         release_dma_lock(flags);
633
634         if (elp_debug >= 3) {
635                 printk(KERN_DEBUG "%s: rx DMA transfer started\n", dev->name);
636         }
637
638         if (adapter->rx_active)
639                 adapter->rx_active--;
640
641         if (!adapter->busy)
642                 printk(KERN_WARNING "%s: receive_packet called, busy not set.\n", dev->name);
643 }
644
645 /******************************************************
646  *
647  * interrupt handler
648  *
649  ******************************************************/
650
651 static irqreturn_t elp_interrupt(int irq, void *dev_id)
652 {
653         int len;
654         int dlen;
655         int icount = 0;
656         struct net_device *dev;
657         elp_device *adapter;
658         unsigned long timeout;
659
660         dev = dev_id;
661         adapter = (elp_device *) dev->priv;
662
663         spin_lock(&adapter->lock);
664
665         do {
666                 /*
667                  * has a DMA transfer finished?
668                  */
669                 if (inb_status(dev->base_addr) & DONE) {
670                         if (!adapter->dmaing) {
671                                 printk(KERN_WARNING "%s: phantom DMA completed\n", dev->name);
672                         }
673                         if (elp_debug >= 3) {
674                                 printk(KERN_DEBUG "%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
675                         }
676
677                         outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
678                         if (adapter->current_dma.direction) {
679                                 dev_kfree_skb_irq(adapter->current_dma.skb);
680                         } else {
681                                 struct sk_buff *skb = adapter->current_dma.skb;
682                                 if (skb) {
683                                         if (adapter->current_dma.target) {
684                                         /* have already done the skb_put() */
685                                         memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
686                                         }
687                                         skb->protocol = eth_type_trans(skb,dev);
688                                         adapter->stats.rx_bytes += skb->len;
689                                         netif_rx(skb);
690                                         dev->last_rx = jiffies;
691                                 }
692                         }
693                         adapter->dmaing = 0;
694                         if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
695                                 int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
696                                 adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
697                                 if (elp_debug >= 2)
698                                         printk(KERN_DEBUG "%s: receiving backlogged packet (%d)\n", dev->name, t);
699                                 receive_packet(dev, t);
700                         } else {
701                                 adapter->busy = 0;
702                         }
703                 } else {
704                         /* has one timed out? */
705                         check_3c505_dma(dev);
706                 }
707
708                 /*
709                  * receive a PCB from the adapter
710                  */
711                 timeout = jiffies + 3*HZ/100;
712                 while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
713                         if (receive_pcb(dev, &adapter->irx_pcb)) {
714                                 switch (adapter->irx_pcb.command)
715                                 {
716                                 case 0:
717                                         break;
718                                         /*
719                                          * received a packet - this must be handled fast
720                                          */
721                                 case 0xff:
722                                 case CMD_RECEIVE_PACKET_COMPLETE:
723                                         /* if the device isn't open, don't pass packets up the stack */
724                                         if (!netif_running(dev))
725                                                 break;
726                                         len = adapter->irx_pcb.data.rcv_resp.pkt_len;
727                                         dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
728                                         if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
729                                                 printk(KERN_ERR "%s: interrupt - packet not received correctly\n", dev->name);
730                                         } else {
731                                                 if (elp_debug >= 3) {
732                                                         printk(KERN_DEBUG "%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
733                                                 }
734                                                 if (adapter->irx_pcb.command == 0xff) {
735                                                         if (elp_debug >= 2)
736                                                                 printk(KERN_DEBUG "%s: adding packet to backlog (len = %d)\n", dev->name, dlen);
737                                                         adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
738                                                         adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
739                                                 } else {
740                                                         receive_packet(dev, dlen);
741                                                 }
742                                                 if (elp_debug >= 3)
743                                                         printk(KERN_DEBUG "%s: packet received\n", dev->name);
744                                         }
745                                         break;
746
747                                         /*
748                                          * 82586 configured correctly
749                                          */
750                                 case CMD_CONFIGURE_82586_RESPONSE:
751                                         adapter->got[CMD_CONFIGURE_82586] = 1;
752                                         if (elp_debug >= 3)
753                                                 printk(KERN_DEBUG "%s: interrupt - configure response received\n", dev->name);
754                                         break;
755
756                                         /*
757                                          * Adapter memory configuration
758                                          */
759                                 case CMD_CONFIGURE_ADAPTER_RESPONSE:
760                                         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
761                                         if (elp_debug >= 3)
762                                                 printk(KERN_DEBUG "%s: Adapter memory configuration %s.\n", dev->name,
763                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
764                                         break;
765
766                                         /*
767                                          * Multicast list loading
768                                          */
769                                 case CMD_LOAD_MULTICAST_RESPONSE:
770                                         adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
771                                         if (elp_debug >= 3)
772                                                 printk(KERN_DEBUG "%s: Multicast address list loading %s.\n", dev->name,
773                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
774                                         break;
775
776                                         /*
777                                          * Station address setting
778                                          */
779                                 case CMD_SET_ADDRESS_RESPONSE:
780                                         adapter->got[CMD_SET_STATION_ADDRESS] = 1;
781                                         if (elp_debug >= 3)
782                                                 printk(KERN_DEBUG "%s: Ethernet address setting %s.\n", dev->name,
783                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
784                                         break;
785
786
787                                         /*
788                                          * received board statistics
789                                          */
790                                 case CMD_NETWORK_STATISTICS_RESPONSE:
791                                         adapter->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
792                                         adapter->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
793                                         adapter->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
794                                         adapter->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
795                                         adapter->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
796                                         adapter->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
797                                         adapter->got[CMD_NETWORK_STATISTICS] = 1;
798                                         if (elp_debug >= 3)
799                                                 printk(KERN_DEBUG "%s: interrupt - statistics response received\n", dev->name);
800                                         break;
801
802                                         /*
803                                          * sent a packet
804                                          */
805                                 case CMD_TRANSMIT_PACKET_COMPLETE:
806                                         if (elp_debug >= 3)
807                                                 printk(KERN_DEBUG "%s: interrupt - packet sent\n", dev->name);
808                                         if (!netif_running(dev))
809                                                 break;
810                                         switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
811                                         case 0xffff:
812                                                 adapter->stats.tx_aborted_errors++;
813                                                 printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name);
814                                                 break;
815                                         case 0xfffe:
816                                                 adapter->stats.tx_fifo_errors++;
817                                                 printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name);
818                                                 break;
819                                         }
820                                         netif_wake_queue(dev);
821                                         break;
822
823                                         /*
824                                          * some unknown PCB
825                                          */
826                                 default:
827                                         printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
828                                         break;
829                                 }
830                         } else {
831                                 printk(KERN_WARNING "%s: failed to read PCB on interrupt\n", dev->name);
832                                 adapter_reset(dev);
833                         }
834                 }
835
836         } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
837
838         prime_rx(dev);
839
840         /*
841          * indicate no longer in interrupt routine
842          */
843         spin_unlock(&adapter->lock);
844         return IRQ_HANDLED;
845 }
846
847
848 /******************************************************
849  *
850  * open the board
851  *
852  ******************************************************/
853
854 static int elp_open(struct net_device *dev)
855 {
856         elp_device *adapter;
857         int retval;
858
859         adapter = dev->priv;
860
861         if (elp_debug >= 3)
862                 printk(KERN_DEBUG "%s: request to open device\n", dev->name);
863
864         /*
865          * make sure we actually found the device
866          */
867         if (adapter == NULL) {
868                 printk(KERN_ERR "%s: Opening a non-existent physical device\n", dev->name);
869                 return -EAGAIN;
870         }
871         /*
872          * disable interrupts on the board
873          */
874         outb_control(0, dev);
875
876         /*
877          * clear any pending interrupts
878          */
879         inb_command(dev->base_addr);
880         adapter_reset(dev);
881
882         /*
883          * no receive PCBs active
884          */
885         adapter->rx_active = 0;
886
887         adapter->busy = 0;
888         adapter->send_pcb_semaphore = 0;
889         adapter->rx_backlog.in = 0;
890         adapter->rx_backlog.out = 0;
891
892         spin_lock_init(&adapter->lock);
893
894         /*
895          * install our interrupt service routine
896          */
897         if ((retval = request_irq(dev->irq, &elp_interrupt, 0, dev->name, dev))) {
898                 printk(KERN_ERR "%s: could not allocate IRQ%d\n", dev->name, dev->irq);
899                 return retval;
900         }
901         if ((retval = request_dma(dev->dma, dev->name))) {
902                 free_irq(dev->irq, dev);
903                 printk(KERN_ERR "%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
904                 return retval;
905         }
906         adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
907         if (!adapter->dma_buffer) {
908                 printk(KERN_ERR "%s: could not allocate DMA buffer\n", dev->name);
909                 free_dma(dev->dma);
910                 free_irq(dev->irq, dev);
911                 return -ENOMEM;
912         }
913         adapter->dmaing = 0;
914
915         /*
916          * enable interrupts on the board
917          */
918         outb_control(CMDE, dev);
919
920         /*
921          * configure adapter memory: we need 10 multicast addresses, default==0
922          */
923         if (elp_debug >= 3)
924                 printk(KERN_DEBUG "%s: sending 3c505 memory configuration command\n", dev->name);
925         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
926         adapter->tx_pcb.data.memconf.cmd_q = 10;
927         adapter->tx_pcb.data.memconf.rcv_q = 20;
928         adapter->tx_pcb.data.memconf.mcast = 10;
929         adapter->tx_pcb.data.memconf.frame = 20;
930         adapter->tx_pcb.data.memconf.rcv_b = 20;
931         adapter->tx_pcb.data.memconf.progs = 0;
932         adapter->tx_pcb.length = sizeof(struct Memconf);
933         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
934         if (!send_pcb(dev, &adapter->tx_pcb))
935                 printk(KERN_ERR "%s: couldn't send memory configuration command\n", dev->name);
936         else {
937                 unsigned long timeout = jiffies + TIMEOUT;
938                 while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
939                 if (time_after_eq(jiffies, timeout))
940                         TIMEOUT_MSG(__LINE__);
941         }
942
943
944         /*
945          * configure adapter to receive broadcast messages and wait for response
946          */
947         if (elp_debug >= 3)
948                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
949         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
950         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
951         adapter->tx_pcb.length = 2;
952         adapter->got[CMD_CONFIGURE_82586] = 0;
953         if (!send_pcb(dev, &adapter->tx_pcb))
954                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
955         else {
956                 unsigned long timeout = jiffies + TIMEOUT;
957                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
958                 if (time_after_eq(jiffies, timeout))
959                         TIMEOUT_MSG(__LINE__);
960         }
961
962         /* enable burst-mode DMA */
963         /* outb(0x1, dev->base_addr + PORT_AUXDMA); */
964
965         /*
966          * queue receive commands to provide buffering
967          */
968         prime_rx(dev);
969         if (elp_debug >= 3)
970                 printk(KERN_DEBUG "%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
971
972         /*
973          * device is now officially open!
974          */
975
976         netif_start_queue(dev);
977         return 0;
978 }
979
980
981 /******************************************************
982  *
983  * send a packet to the adapter
984  *
985  ******************************************************/
986
987 static int send_packet(struct net_device *dev, struct sk_buff *skb)
988 {
989         elp_device *adapter = dev->priv;
990         unsigned long target;
991         unsigned long flags;
992
993         /*
994          * make sure the length is even and no shorter than 60 bytes
995          */
996         unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
997
998         if (test_and_set_bit(0, (void *) &adapter->busy)) {
999                 if (elp_debug >= 2)
1000                         printk(KERN_DEBUG "%s: transmit blocked\n", dev->name);
1001                 return FALSE;
1002         }
1003
1004         adapter->stats.tx_bytes += nlen;
1005
1006         /*
1007          * send the adapter a transmit packet command. Ignore segment and offset
1008          * and make sure the length is even
1009          */
1010         adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
1011         adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
1012         adapter->tx_pcb.data.xmit_pkt.buf_ofs
1013             = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0;        /* Unused */
1014         adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;
1015
1016         if (!send_pcb(dev, &adapter->tx_pcb)) {
1017                 adapter->busy = 0;
1018                 return FALSE;
1019         }
1020         /* if this happens, we die */
1021         if (test_and_set_bit(0, (void *) &adapter->dmaing))
1022                 printk(KERN_DEBUG "%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
1023
1024         adapter->current_dma.direction = 1;
1025         adapter->current_dma.start_time = jiffies;
1026
1027         if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) {
1028                 skb_copy_from_linear_data(skb, adapter->dma_buffer, nlen);
1029                 memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len);
1030                 target = isa_virt_to_bus(adapter->dma_buffer);
1031         }
1032         else {
1033                 target = isa_virt_to_bus(skb->data);
1034         }
1035         adapter->current_dma.skb = skb;
1036
1037         flags=claim_dma_lock();
1038         disable_dma(dev->dma);
1039         clear_dma_ff(dev->dma);
1040         set_dma_mode(dev->dma, 0x48);   /* dma memory -> io */
1041         set_dma_addr(dev->dma, target);
1042         set_dma_count(dev->dma, nlen);
1043         outb_control(adapter->hcr_val | DMAE | TCEN, dev);
1044         enable_dma(dev->dma);
1045         release_dma_lock(flags);
1046
1047         if (elp_debug >= 3)
1048                 printk(KERN_DEBUG "%s: DMA transfer started\n", dev->name);
1049
1050         return TRUE;
1051 }
1052
1053 /*
1054  *      The upper layer thinks we timed out
1055  */
1056
1057 static void elp_timeout(struct net_device *dev)
1058 {
1059         elp_device *adapter = dev->priv;
1060         int stat;
1061
1062         stat = inb_status(dev->base_addr);
1063         printk(KERN_WARNING "%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
1064         if (elp_debug >= 1)
1065                 printk(KERN_DEBUG "%s: status %#02x\n", dev->name, stat);
1066         dev->trans_start = jiffies;
1067         adapter->stats.tx_dropped++;
1068         netif_wake_queue(dev);
1069 }
1070
1071 /******************************************************
1072  *
1073  * start the transmitter
1074  *    return 0 if sent OK, else return 1
1075  *
1076  ******************************************************/
1077
1078 static int elp_start_xmit(struct sk_buff *skb, struct net_device *dev)
1079 {
1080         unsigned long flags;
1081         elp_device *adapter = dev->priv;
1082
1083         spin_lock_irqsave(&adapter->lock, flags);
1084         check_3c505_dma(dev);
1085
1086         if (elp_debug >= 3)
1087                 printk(KERN_DEBUG "%s: request to send packet of length %d\n", dev->name, (int) skb->len);
1088
1089         netif_stop_queue(dev);
1090
1091         /*
1092          * send the packet at skb->data for skb->len
1093          */
1094         if (!send_packet(dev, skb)) {
1095                 if (elp_debug >= 2) {
1096                         printk(KERN_DEBUG "%s: failed to transmit packet\n", dev->name);
1097                 }
1098                 spin_unlock_irqrestore(&adapter->lock, flags);
1099                 return 1;
1100         }
1101         if (elp_debug >= 3)
1102                 printk(KERN_DEBUG "%s: packet of length %d sent\n", dev->name, (int) skb->len);
1103
1104         /*
1105          * start the transmit timeout
1106          */
1107         dev->trans_start = jiffies;
1108
1109         prime_rx(dev);
1110         spin_unlock_irqrestore(&adapter->lock, flags);
1111         netif_start_queue(dev);
1112         return 0;
1113 }
1114
1115 /******************************************************
1116  *
1117  * return statistics on the board
1118  *
1119  ******************************************************/
1120
1121 static struct net_device_stats *elp_get_stats(struct net_device *dev)
1122 {
1123         elp_device *adapter = (elp_device *) dev->priv;
1124
1125         if (elp_debug >= 3)
1126                 printk(KERN_DEBUG "%s: request for stats\n", dev->name);
1127
1128         /* If the device is closed, just return the latest stats we have,
1129            - we cannot ask from the adapter without interrupts */
1130         if (!netif_running(dev))
1131                 return &adapter->stats;
1132
1133         /* send a get statistics command to the board */
1134         adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
1135         adapter->tx_pcb.length = 0;
1136         adapter->got[CMD_NETWORK_STATISTICS] = 0;
1137         if (!send_pcb(dev, &adapter->tx_pcb))
1138                 printk(KERN_ERR "%s: couldn't send get statistics command\n", dev->name);
1139         else {
1140                 unsigned long timeout = jiffies + TIMEOUT;
1141                 while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && time_before(jiffies, timeout));
1142                 if (time_after_eq(jiffies, timeout)) {
1143                         TIMEOUT_MSG(__LINE__);
1144                         return &adapter->stats;
1145                 }
1146         }
1147
1148         /* statistics are now up to date */
1149         return &adapter->stats;
1150 }
1151
1152
1153 static void netdev_get_drvinfo(struct net_device *dev,
1154                                struct ethtool_drvinfo *info)
1155 {
1156         strcpy(info->driver, DRV_NAME);
1157         strcpy(info->version, DRV_VERSION);
1158         sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
1159 }
1160
1161 static u32 netdev_get_msglevel(struct net_device *dev)
1162 {
1163         return debug;
1164 }
1165
1166 static void netdev_set_msglevel(struct net_device *dev, u32 level)
1167 {
1168         debug = level;
1169 }
1170
1171 static const struct ethtool_ops netdev_ethtool_ops = {
1172         .get_drvinfo            = netdev_get_drvinfo,
1173         .get_msglevel           = netdev_get_msglevel,
1174         .set_msglevel           = netdev_set_msglevel,
1175 };
1176
1177 /******************************************************
1178  *
1179  * close the board
1180  *
1181  ******************************************************/
1182
1183 static int elp_close(struct net_device *dev)
1184 {
1185         elp_device *adapter;
1186
1187         adapter = dev->priv;
1188
1189         if (elp_debug >= 3)
1190                 printk(KERN_DEBUG "%s: request to close device\n", dev->name);
1191
1192         netif_stop_queue(dev);
1193
1194         /* Someone may request the device statistic information even when
1195          * the interface is closed. The following will update the statistics
1196          * structure in the driver, so we'll be able to give current statistics.
1197          */
1198         (void) elp_get_stats(dev);
1199
1200         /*
1201          * disable interrupts on the board
1202          */
1203         outb_control(0, dev);
1204
1205         /*
1206          * release the IRQ
1207          */
1208         free_irq(dev->irq, dev);
1209
1210         free_dma(dev->dma);
1211         free_pages((unsigned long) adapter->dma_buffer, get_order(DMA_BUFFER_SIZE));
1212
1213         return 0;
1214 }
1215
1216
1217 /************************************************************
1218  *
1219  * Set multicast list
1220  * num_addrs==0: clear mc_list
1221  * num_addrs==-1: set promiscuous mode
1222  * num_addrs>0: set mc_list
1223  *
1224  ************************************************************/
1225
1226 static void elp_set_mc_list(struct net_device *dev)
1227 {
1228         elp_device *adapter = (elp_device *) dev->priv;
1229         struct dev_mc_list *dmi = dev->mc_list;
1230         int i;
1231         unsigned long flags;
1232
1233         if (elp_debug >= 3)
1234                 printk(KERN_DEBUG "%s: request to set multicast list\n", dev->name);
1235
1236         spin_lock_irqsave(&adapter->lock, flags);
1237
1238         if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1239                 /* send a "load multicast list" command to the board, max 10 addrs/cmd */
1240                 /* if num_addrs==0 the list will be cleared */
1241                 adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
1242                 adapter->tx_pcb.length = 6 * dev->mc_count;
1243                 for (i = 0; i < dev->mc_count; i++) {
1244                         memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
1245                         dmi = dmi->next;
1246                 }
1247                 adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
1248                 if (!send_pcb(dev, &adapter->tx_pcb))
1249                         printk(KERN_ERR "%s: couldn't send set_multicast command\n", dev->name);
1250                 else {
1251                         unsigned long timeout = jiffies + TIMEOUT;
1252                         while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && time_before(jiffies, timeout));
1253                         if (time_after_eq(jiffies, timeout)) {
1254                                 TIMEOUT_MSG(__LINE__);
1255                         }
1256                 }
1257                 if (dev->mc_count)
1258                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
1259                 else            /* num_addrs == 0 */
1260                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1261         } else
1262                 adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
1263         /*
1264          * configure adapter to receive messages (as specified above)
1265          * and wait for response
1266          */
1267         if (elp_debug >= 3)
1268                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
1269         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1270         adapter->tx_pcb.length = 2;
1271         adapter->got[CMD_CONFIGURE_82586] = 0;
1272         if (!send_pcb(dev, &adapter->tx_pcb))
1273         {
1274                 spin_unlock_irqrestore(&adapter->lock, flags);
1275                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
1276         }
1277         else {
1278                 unsigned long timeout = jiffies + TIMEOUT;
1279                 spin_unlock_irqrestore(&adapter->lock, flags);
1280                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
1281                 if (time_after_eq(jiffies, timeout))
1282                         TIMEOUT_MSG(__LINE__);
1283         }
1284 }
1285
1286 /************************************************************
1287  *
1288  * A couple of tests to see if there's 3C505 or not
1289  * Called only by elp_autodetect
1290  ************************************************************/
1291
1292 static int __init elp_sense(struct net_device *dev)
1293 {
1294         int addr = dev->base_addr;
1295         const char *name = dev->name;
1296         byte orig_HSR;
1297
1298         if (!request_region(addr, ELP_IO_EXTENT, "3c505"))
1299                 return -ENODEV;
1300
1301         orig_HSR = inb_status(addr);
1302
1303         if (elp_debug > 0)
1304                 printk(search_msg, name, addr);
1305
1306         if (orig_HSR == 0xff) {
1307                 if (elp_debug > 0)
1308                         printk(notfound_msg, 1);
1309                 goto out;
1310         }
1311
1312         /* Wait for a while; the adapter may still be booting up */
1313         if (elp_debug > 0)
1314                 printk(stilllooking_msg);
1315
1316         if (orig_HSR & DIR) {
1317                 /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
1318                 outb(0, dev->base_addr + PORT_CONTROL);
1319                 msleep(300);
1320                 if (inb_status(addr) & DIR) {
1321                         if (elp_debug > 0)
1322                                 printk(notfound_msg, 2);
1323                         goto out;
1324                 }
1325         } else {
1326                 /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
1327                 outb(DIR, dev->base_addr + PORT_CONTROL);
1328                 msleep(300);
1329                 if (!(inb_status(addr) & DIR)) {
1330                         if (elp_debug > 0)
1331                                 printk(notfound_msg, 3);
1332                         goto out;
1333                 }
1334         }
1335         /*
1336          * It certainly looks like a 3c505.
1337          */
1338         if (elp_debug > 0)
1339                 printk(found_msg);
1340
1341         return 0;
1342 out:
1343         release_region(addr, ELP_IO_EXTENT);
1344         return -ENODEV;
1345 }
1346
1347 /*************************************************************
1348  *
1349  * Search through addr_list[] and try to find a 3C505
1350  * Called only by eplus_probe
1351  *************************************************************/
1352
1353 static int __init elp_autodetect(struct net_device *dev)
1354 {
1355         int idx = 0;
1356
1357         /* if base address set, then only check that address
1358            otherwise, run through the table */
1359         if (dev->base_addr != 0) {      /* dev->base_addr == 0 ==> plain autodetect */
1360                 if (elp_sense(dev) == 0)
1361                         return dev->base_addr;
1362         } else
1363                 while ((dev->base_addr = addr_list[idx++])) {
1364                         if (elp_sense(dev) == 0)
1365                                 return dev->base_addr;
1366                 }
1367
1368         /* could not find an adapter */
1369         if (elp_debug > 0)
1370                 printk(couldnot_msg, dev->name);
1371
1372         return 0;               /* Because of this, the layer above will return -ENODEV */
1373 }
1374
1375
1376 /******************************************************
1377  *
1378  * probe for an Etherlink Plus board at the specified address
1379  *
1380  ******************************************************/
1381
1382 /* There are three situations we need to be able to detect here:
1383
1384  *  a) the card is idle
1385  *  b) the card is still booting up
1386  *  c) the card is stuck in a strange state (some DOS drivers do this)
1387  *
1388  * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
1389  * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
1390  * loop round, and hope for the best.
1391  *
1392  * This is all very unpleasant, but hopefully avoids the problems with the old
1393  * probe code (which had a 15-second delay if the card was idle, and didn't
1394  * work at all if it was in a weird state).
1395  */
1396
1397 static int __init elplus_setup(struct net_device *dev)
1398 {
1399         elp_device *adapter = dev->priv;
1400         int i, tries, tries1, okay;
1401         unsigned long timeout;
1402         unsigned long cookie = 0;
1403         int err = -ENODEV;
1404
1405         SET_MODULE_OWNER(dev);
1406
1407         /*
1408          *  setup adapter structure
1409          */
1410
1411         dev->base_addr = elp_autodetect(dev);
1412         if (!dev->base_addr)
1413                 return -ENODEV;
1414
1415         adapter->send_pcb_semaphore = 0;
1416
1417         for (tries1 = 0; tries1 < 3; tries1++) {
1418                 outb_control((adapter->hcr_val | CMDE) & ~DIR, dev);
1419                 /* First try to write just one byte, to see if the card is
1420                  * responding at all normally.
1421                  */
1422                 timeout = jiffies + 5*HZ/100;
1423                 okay = 0;
1424                 while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1425                 if ((inb_status(dev->base_addr) & HCRE)) {
1426                         outb_command(0, dev->base_addr);        /* send a spurious byte */
1427                         timeout = jiffies + 5*HZ/100;
1428                         while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1429                         if (inb_status(dev->base_addr) & HCRE)
1430                                 okay = 1;
1431                 }
1432                 if (!okay) {
1433                         /* Nope, it's ignoring the command register.  This means that
1434                          * either it's still booting up, or it's died.
1435                          */
1436                         printk(KERN_ERR "%s: command register wouldn't drain, ", dev->name);
1437                         if ((inb_status(dev->base_addr) & 7) == 3) {
1438                                 /* If the adapter status is 3, it *could* still be booting.
1439                                  * Give it the benefit of the doubt for 10 seconds.
1440                                  */
1441                                 printk("assuming 3c505 still starting\n");
1442                                 timeout = jiffies + 10*HZ;
1443                                 while (time_before(jiffies, timeout) && (inb_status(dev->base_addr) & 7));
1444                                 if (inb_status(dev->base_addr) & 7) {
1445                                         printk(KERN_ERR "%s: 3c505 failed to start\n", dev->name);
1446                                 } else {
1447                                         okay = 1;  /* It started */
1448                                 }
1449                         } else {
1450                                 /* Otherwise, it must just be in a strange
1451                                  * state.  We probably need to kick it.
1452                                  */
1453                                 printk("3c505 is sulking\n");
1454                         }
1455                 }
1456                 for (tries = 0; tries < 5 && okay; tries++) {
1457
1458                         /*
1459                          * Try to set the Ethernet address, to make sure that the board
1460                          * is working.
1461                          */
1462                         adapter->tx_pcb.command = CMD_STATION_ADDRESS;
1463                         adapter->tx_pcb.length = 0;
1464                         cookie = probe_irq_on();
1465                         if (!send_pcb(dev, &adapter->tx_pcb)) {
1466                                 printk(KERN_ERR "%s: could not send first PCB\n", dev->name);
1467                                 probe_irq_off(cookie);
1468                                 continue;
1469                         }
1470                         if (!receive_pcb(dev, &adapter->rx_pcb)) {
1471                                 printk(KERN_ERR "%s: could not read first PCB\n", dev->name);
1472                                 probe_irq_off(cookie);
1473                                 continue;
1474                         }
1475                         if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
1476                             (adapter->rx_pcb.length != 6)) {
1477                                 printk(KERN_ERR "%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
1478                                 probe_irq_off(cookie);
1479                                 continue;
1480                         }
1481                         goto okay;
1482                 }
1483                 /* It's broken.  Do a hard reset to re-initialise the board,
1484                  * and try again.
1485                  */
1486                 printk(KERN_INFO "%s: resetting adapter\n", dev->name);
1487                 outb_control(adapter->hcr_val | FLSH | ATTN, dev);
1488                 outb_control(adapter->hcr_val & ~(FLSH | ATTN), dev);
1489         }
1490         printk(KERN_ERR "%s: failed to initialise 3c505\n", dev->name);
1491         goto out;
1492
1493       okay:
1494         if (dev->irq) {         /* Is there a preset IRQ? */
1495                 int rpt = probe_irq_off(cookie);
1496                 if (dev->irq != rpt) {
1497                         printk(KERN_WARNING "%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
1498                 }
1499                 /* if dev->irq == probe_irq_off(cookie), all is well */
1500         } else                 /* No preset IRQ; just use what we can detect */
1501                 dev->irq = probe_irq_off(cookie);
1502         switch (dev->irq) {    /* Legal, sane? */
1503         case 0:
1504                 printk(KERN_ERR "%s: IRQ probe failed: check 3c505 jumpers.\n",
1505                        dev->name);
1506                 goto out;
1507         case 1:
1508         case 6:
1509         case 8:
1510         case 13:
1511                 printk(KERN_ERR "%s: Impossible IRQ %d reported by probe_irq_off().\n",
1512                        dev->name, dev->irq);
1513                        goto out;
1514         }
1515         /*
1516          *  Now we have the IRQ number so we can disable the interrupts from
1517          *  the board until the board is opened.
1518          */
1519         outb_control(adapter->hcr_val & ~CMDE, dev);
1520
1521         /*
1522          * copy Ethernet address into structure
1523          */
1524         for (i = 0; i < 6; i++)
1525                 dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
1526
1527         /* find a DMA channel */
1528         if (!dev->dma) {
1529                 if (dev->mem_start) {
1530                         dev->dma = dev->mem_start & 7;
1531                 }
1532                 else {
1533                         printk(KERN_WARNING "%s: warning, DMA channel not specified, using default\n", dev->name);
1534                         dev->dma = ELP_DMA;
1535                 }
1536         }
1537
1538         /*
1539          * print remainder of startup message
1540          */
1541         printk(KERN_INFO "%s: 3c505 at %#lx, irq %d, dma %d, ",
1542                dev->name, dev->base_addr, dev->irq, dev->dma);
1543         printk("addr %02x:%02x:%02x:%02x:%02x:%02x, ",
1544                dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1545                dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1546
1547         /*
1548          * read more information from the adapter
1549          */
1550
1551         adapter->tx_pcb.command = CMD_ADAPTER_INFO;
1552         adapter->tx_pcb.length = 0;
1553         if (!send_pcb(dev, &adapter->tx_pcb) ||
1554             !receive_pcb(dev, &adapter->rx_pcb) ||
1555             (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
1556             (adapter->rx_pcb.length != 10)) {
1557                 printk("not responding to second PCB\n");
1558         }
1559         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);
1560
1561         /*
1562          * reconfigure the adapter memory to better suit our purposes
1563          */
1564         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
1565         adapter->tx_pcb.length = 12;
1566         adapter->tx_pcb.data.memconf.cmd_q = 8;
1567         adapter->tx_pcb.data.memconf.rcv_q = 8;
1568         adapter->tx_pcb.data.memconf.mcast = 10;
1569         adapter->tx_pcb.data.memconf.frame = 10;
1570         adapter->tx_pcb.data.memconf.rcv_b = 10;
1571         adapter->tx_pcb.data.memconf.progs = 0;
1572         if (!send_pcb(dev, &adapter->tx_pcb) ||
1573             !receive_pcb(dev, &adapter->rx_pcb) ||
1574             (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
1575             (adapter->rx_pcb.length != 2)) {
1576                 printk(KERN_ERR "%s: could not configure adapter memory\n", dev->name);
1577         }
1578         if (adapter->rx_pcb.data.configure) {
1579                 printk(KERN_ERR "%s: adapter configuration failed\n", dev->name);
1580         }
1581
1582         dev->open = elp_open;                           /* local */
1583         dev->stop = elp_close;                          /* local */
1584         dev->get_stats = elp_get_stats;                 /* local */
1585         dev->hard_start_xmit = elp_start_xmit;          /* local */
1586         dev->tx_timeout = elp_timeout;                  /* local */
1587         dev->watchdog_timeo = 10*HZ;
1588         dev->set_multicast_list = elp_set_mc_list;      /* local */
1589         dev->ethtool_ops = &netdev_ethtool_ops;         /* local */
1590
1591         memset(&(adapter->stats), 0, sizeof(struct net_device_stats));
1592         dev->mem_start = dev->mem_end = 0;
1593
1594         err = register_netdev(dev);
1595         if (err)
1596                 goto out;
1597
1598         return 0;
1599 out:
1600         release_region(dev->base_addr, ELP_IO_EXTENT);
1601         return err;
1602 }
1603
1604 #ifndef MODULE
1605 struct net_device * __init elplus_probe(int unit)
1606 {
1607         struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1608         int err;
1609         if (!dev)
1610                 return ERR_PTR(-ENOMEM);
1611
1612         sprintf(dev->name, "eth%d", unit);
1613         netdev_boot_setup_check(dev);
1614
1615         err = elplus_setup(dev);
1616         if (err) {
1617                 free_netdev(dev);
1618                 return ERR_PTR(err);
1619         }
1620         return dev;
1621 }
1622
1623 #else
1624 static struct net_device *dev_3c505[ELP_MAX_CARDS];
1625 static int io[ELP_MAX_CARDS];
1626 static int irq[ELP_MAX_CARDS];
1627 static int dma[ELP_MAX_CARDS];
1628 module_param_array(io, int, NULL, 0);
1629 module_param_array(irq, int, NULL, 0);
1630 module_param_array(dma, int, NULL, 0);
1631 MODULE_PARM_DESC(io, "EtherLink Plus I/O base address(es)");
1632 MODULE_PARM_DESC(irq, "EtherLink Plus IRQ number(s) (assigned)");
1633 MODULE_PARM_DESC(dma, "EtherLink Plus DMA channel(s)");
1634
1635 int __init init_module(void)
1636 {
1637         int this_dev, found = 0;
1638
1639         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1640                 struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1641                 if (!dev)
1642                         break;
1643
1644                 dev->irq = irq[this_dev];
1645                 dev->base_addr = io[this_dev];
1646                 if (dma[this_dev]) {
1647                         dev->dma = dma[this_dev];
1648                 } else {
1649                         dev->dma = ELP_DMA;
1650                         printk(KERN_WARNING "3c505.c: warning, using default DMA channel,\n");
1651                 }
1652                 if (io[this_dev] == 0) {
1653                         if (this_dev) {
1654                                 free_netdev(dev);
1655                                 break;
1656                         }
1657                         printk(KERN_NOTICE "3c505.c: module autoprobe not recommended, give io=xx.\n");
1658                 }
1659                 if (elplus_setup(dev) != 0) {
1660                         printk(KERN_WARNING "3c505.c: Failed to register card at 0x%x.\n", io[this_dev]);
1661                         free_netdev(dev);
1662                         break;
1663                 }
1664                 dev_3c505[this_dev] = dev;
1665                 found++;
1666         }
1667         if (!found)
1668                 return -ENODEV;
1669         return 0;
1670 }
1671
1672 void __exit cleanup_module(void)
1673 {
1674         int this_dev;
1675
1676         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1677                 struct net_device *dev = dev_3c505[this_dev];
1678                 if (dev) {
1679                         unregister_netdev(dev);
1680                         release_region(dev->base_addr, ELP_IO_EXTENT);
1681                         free_netdev(dev);
1682                 }
1683         }
1684 }
1685
1686 #endif                          /* MODULE */
1687 MODULE_LICENSE("GPL");