a424869707a5225b1f04e9d2e070a87d1987f19a
[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,__func__,(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,__func__,__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  * List of I/O-addresses we try to auto-sense
173  * Last element MUST BE 0!
174  *****************************************************************/
175
176 static int addr_list[] __initdata = {0x300, 0x280, 0x310, 0};
177
178 /* Dma Memory related stuff */
179
180 static unsigned long dma_mem_alloc(int size)
181 {
182         int order = get_order(size);
183         return __get_dma_pages(GFP_KERNEL, order);
184 }
185
186
187 /*****************************************************************
188  *
189  * Functions for I/O (note the inline !)
190  *
191  *****************************************************************/
192
193 static inline unsigned char inb_status(unsigned int base_addr)
194 {
195         return inb(base_addr + PORT_STATUS);
196 }
197
198 static inline int inb_command(unsigned int base_addr)
199 {
200         return inb(base_addr + PORT_COMMAND);
201 }
202
203 static inline void outb_control(unsigned char val, struct net_device *dev)
204 {
205         outb(val, dev->base_addr + PORT_CONTROL);
206         ((elp_device *)(dev->priv))->hcr_val = val;
207 }
208
209 #define HCR_VAL(x)   (((elp_device *)((x)->priv))->hcr_val)
210
211 static inline void outb_command(unsigned char val, unsigned int base_addr)
212 {
213         outb(val, base_addr + PORT_COMMAND);
214 }
215
216 static inline unsigned int backlog_next(unsigned int n)
217 {
218         return (n + 1) % BACKLOG_SIZE;
219 }
220
221 /*****************************************************************
222  *
223  *  useful functions for accessing the adapter
224  *
225  *****************************************************************/
226
227 /*
228  * use this routine when accessing the ASF bits as they are
229  * changed asynchronously by the adapter
230  */
231
232 /* get adapter PCB status */
233 #define GET_ASF(addr) \
234         (get_status(addr)&ASF_PCB_MASK)
235
236 static inline int get_status(unsigned int base_addr)
237 {
238         unsigned long timeout = jiffies + 10*HZ/100;
239         register int stat1;
240         do {
241                 stat1 = inb_status(base_addr);
242         } while (stat1 != inb_status(base_addr) && time_before(jiffies, timeout));
243         if (time_after_eq(jiffies, timeout))
244                 TIMEOUT_MSG(__LINE__);
245         return stat1;
246 }
247
248 static inline void set_hsf(struct net_device *dev, int hsf)
249 {
250         elp_device *adapter = dev->priv;
251         unsigned long flags;
252
253         spin_lock_irqsave(&adapter->lock, flags);
254         outb_control((HCR_VAL(dev) & ~HSF_PCB_MASK) | hsf, dev);
255         spin_unlock_irqrestore(&adapter->lock, flags);
256 }
257
258 static bool start_receive(struct net_device *, pcb_struct *);
259
260 static inline void adapter_reset(struct net_device *dev)
261 {
262         unsigned long timeout;
263         elp_device *adapter = dev->priv;
264         unsigned char orig_hcr = adapter->hcr_val;
265
266         outb_control(0, dev);
267
268         if (inb_status(dev->base_addr) & ACRF) {
269                 do {
270                         inb_command(dev->base_addr);
271                         timeout = jiffies + 2*HZ/100;
272                         while (time_before_eq(jiffies, timeout) && !(inb_status(dev->base_addr) & ACRF));
273                 } while (inb_status(dev->base_addr) & ACRF);
274                 set_hsf(dev, HSF_PCB_NAK);
275         }
276         outb_control(adapter->hcr_val | ATTN | DIR, dev);
277         mdelay(10);
278         outb_control(adapter->hcr_val & ~ATTN, dev);
279         mdelay(10);
280         outb_control(adapter->hcr_val | FLSH, dev);
281         mdelay(10);
282         outb_control(adapter->hcr_val & ~FLSH, dev);
283         mdelay(10);
284
285         outb_control(orig_hcr, dev);
286         if (!start_receive(dev, &adapter->tx_pcb))
287                 printk(KERN_ERR "%s: start receive command failed \n", dev->name);
288 }
289
290 /* Check to make sure that a DMA transfer hasn't timed out.  This should
291  * never happen in theory, but seems to occur occasionally if the card gets
292  * prodded at the wrong time.
293  */
294 static inline void check_3c505_dma(struct net_device *dev)
295 {
296         elp_device *adapter = dev->priv;
297         if (adapter->dmaing && time_after(jiffies, adapter->current_dma.start_time + 10)) {
298                 unsigned long flags, f;
299                 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));
300                 spin_lock_irqsave(&adapter->lock, flags);
301                 adapter->dmaing = 0;
302                 adapter->busy = 0;
303
304                 f=claim_dma_lock();
305                 disable_dma(dev->dma);
306                 release_dma_lock(f);
307
308                 if (adapter->rx_active)
309                         adapter->rx_active--;
310                 outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
311                 spin_unlock_irqrestore(&adapter->lock, flags);
312         }
313 }
314
315 /* Primitive functions used by send_pcb() */
316 static inline bool send_pcb_slow(unsigned int base_addr, unsigned char byte)
317 {
318         unsigned long timeout;
319         outb_command(byte, base_addr);
320         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
321                 if (inb_status(base_addr) & HCRE)
322                         return false;
323         }
324         printk(KERN_WARNING "3c505: send_pcb_slow timed out\n");
325         return true;
326 }
327
328 static inline bool send_pcb_fast(unsigned int base_addr, unsigned char byte)
329 {
330         unsigned int timeout;
331         outb_command(byte, base_addr);
332         for (timeout = 0; timeout < 40000; timeout++) {
333                 if (inb_status(base_addr) & HCRE)
334                         return false;
335         }
336         printk(KERN_WARNING "3c505: send_pcb_fast timed out\n");
337         return true;
338 }
339
340 /* Check to see if the receiver needs restarting, and kick it if so */
341 static inline void prime_rx(struct net_device *dev)
342 {
343         elp_device *adapter = dev->priv;
344         while (adapter->rx_active < ELP_RX_PCBS && netif_running(dev)) {
345                 if (!start_receive(dev, &adapter->itx_pcb))
346                         break;
347         }
348 }
349
350 /*****************************************************************
351  *
352  * send_pcb
353  *   Send a PCB to the adapter.
354  *
355  *      output byte to command reg  --<--+
356  *      wait until HCRE is non zero      |
357  *      loop until all bytes sent   -->--+
358  *      set HSF1 and HSF2 to 1
359  *      output pcb length
360  *      wait until ASF give ACK or NAK
361  *      set HSF1 and HSF2 to 0
362  *
363  *****************************************************************/
364
365 /* This can be quite slow -- the adapter is allowed to take up to 40ms
366  * to respond to the initial interrupt.
367  *
368  * We run initially with interrupts turned on, but with a semaphore set
369  * so that nobody tries to re-enter this code.  Once the first byte has
370  * gone through, we turn interrupts off and then send the others (the
371  * timeout is reduced to 500us).
372  */
373
374 static bool send_pcb(struct net_device *dev, pcb_struct * pcb)
375 {
376         int i;
377         unsigned long timeout;
378         elp_device *adapter = dev->priv;
379         unsigned long flags;
380
381         check_3c505_dma(dev);
382
383         if (adapter->dmaing && adapter->current_dma.direction == 0)
384                 return false;
385
386         /* Avoid contention */
387         if (test_and_set_bit(1, &adapter->send_pcb_semaphore)) {
388                 if (elp_debug >= 3) {
389                         printk(KERN_DEBUG "%s: send_pcb entered while threaded\n", dev->name);
390                 }
391                 return false;
392         }
393         /*
394          * load each byte into the command register and
395          * wait for the HCRE bit to indicate the adapter
396          * had read the byte
397          */
398         set_hsf(dev, 0);
399
400         if (send_pcb_slow(dev->base_addr, pcb->command))
401                 goto abort;
402
403         spin_lock_irqsave(&adapter->lock, flags);
404
405         if (send_pcb_fast(dev->base_addr, pcb->length))
406                 goto sti_abort;
407
408         for (i = 0; i < pcb->length; i++) {
409                 if (send_pcb_fast(dev->base_addr, pcb->data.raw[i]))
410                         goto sti_abort;
411         }
412
413         outb_control(adapter->hcr_val | 3, dev);        /* signal end of PCB */
414         outb_command(2 + pcb->length, dev->base_addr);
415
416         /* now wait for the acknowledgement */
417         spin_unlock_irqrestore(&adapter->lock, flags);
418
419         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
420                 switch (GET_ASF(dev->base_addr)) {
421                 case ASF_PCB_ACK:
422                         adapter->send_pcb_semaphore = 0;
423                         return true;
424
425                 case ASF_PCB_NAK:
426 #ifdef ELP_DEBUG
427                         printk(KERN_DEBUG "%s: send_pcb got NAK\n", dev->name);
428 #endif
429                         goto abort;
430                 }
431         }
432
433         if (elp_debug >= 1)
434                 printk(KERN_DEBUG "%s: timeout waiting for PCB acknowledge (status %02x)\n", dev->name, inb_status(dev->base_addr));
435         goto abort;
436
437       sti_abort:
438         spin_unlock_irqrestore(&adapter->lock, flags);
439       abort:
440         adapter->send_pcb_semaphore = 0;
441         return false;
442 }
443
444
445 /*****************************************************************
446  *
447  * receive_pcb
448  *   Read a PCB from the adapter
449  *
450  *      wait for ACRF to be non-zero        ---<---+
451  *      input a byte                               |
452  *      if ASF1 and ASF2 were not both one         |
453  *              before byte was read, loop      --->---+
454  *      set HSF1 and HSF2 for ack
455  *
456  *****************************************************************/
457
458 static bool receive_pcb(struct net_device *dev, pcb_struct * pcb)
459 {
460         int i, j;
461         int total_length;
462         int stat;
463         unsigned long timeout;
464         unsigned long flags;
465
466         elp_device *adapter = dev->priv;
467
468         set_hsf(dev, 0);
469
470         /* get the command code */
471         timeout = jiffies + 2*HZ/100;
472         while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
473         if (time_after_eq(jiffies, timeout)) {
474                 TIMEOUT_MSG(__LINE__);
475                 return false;
476         }
477         pcb->command = inb_command(dev->base_addr);
478
479         /* read the data length */
480         timeout = jiffies + 3*HZ/100;
481         while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
482         if (time_after_eq(jiffies, timeout)) {
483                 TIMEOUT_MSG(__LINE__);
484                 printk(KERN_INFO "%s: status %02x\n", dev->name, stat);
485                 return false;
486         }
487         pcb->length = inb_command(dev->base_addr);
488
489         if (pcb->length > MAX_PCB_DATA) {
490                 INVALID_PCB_MSG(pcb->length);
491                 adapter_reset(dev);
492                 return false;
493         }
494         /* read the data */
495         spin_lock_irqsave(&adapter->lock, flags);
496         i = 0;
497         do {
498                 j = 0;
499                 while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000);
500                 pcb->data.raw[i++] = inb_command(dev->base_addr);
501                 if (i > MAX_PCB_DATA)
502                         INVALID_PCB_MSG(i);
503         } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000);
504         spin_unlock_irqrestore(&adapter->lock, flags);
505         if (j >= 20000) {
506                 TIMEOUT_MSG(__LINE__);
507                 return false;
508         }
509         /* woops, the last "data" byte was really the length! */
510         total_length = pcb->data.raw[--i];
511
512         /* safety check total length vs data length */
513         if (total_length != (pcb->length + 2)) {
514                 if (elp_debug >= 2)
515                         printk(KERN_WARNING "%s: mangled PCB received\n", dev->name);
516                 set_hsf(dev, HSF_PCB_NAK);
517                 return false;
518         }
519
520         if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
521                 if (test_and_set_bit(0, (void *) &adapter->busy)) {
522                         if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
523                                 set_hsf(dev, HSF_PCB_NAK);
524                                 printk(KERN_WARNING "%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
525                                 pcb->command = 0;
526                                 return true;
527                         } else {
528                                 pcb->command = 0xff;
529                         }
530                 }
531         }
532         set_hsf(dev, HSF_PCB_ACK);
533         return true;
534 }
535
536 /******************************************************
537  *
538  *  queue a receive command on the adapter so we will get an
539  *  interrupt when a packet is received.
540  *
541  ******************************************************/
542
543 static bool start_receive(struct net_device *dev, pcb_struct * tx_pcb)
544 {
545         bool status;
546         elp_device *adapter = dev->priv;
547
548         if (elp_debug >= 3)
549                 printk(KERN_DEBUG "%s: restarting receiver\n", dev->name);
550         tx_pcb->command = CMD_RECEIVE_PACKET;
551         tx_pcb->length = sizeof(struct Rcv_pkt);
552         tx_pcb->data.rcv_pkt.buf_seg
553             = tx_pcb->data.rcv_pkt.buf_ofs = 0;         /* Unused */
554         tx_pcb->data.rcv_pkt.buf_len = 1600;
555         tx_pcb->data.rcv_pkt.timeout = 0;       /* set timeout to zero */
556         status = send_pcb(dev, tx_pcb);
557         if (status)
558                 adapter->rx_active++;
559         return status;
560 }
561
562 /******************************************************
563  *
564  * extract a packet from the adapter
565  * this routine is only called from within the interrupt
566  * service routine, so no cli/sti calls are needed
567  * note that the length is always assumed to be even
568  *
569  ******************************************************/
570
571 static void receive_packet(struct net_device *dev, int len)
572 {
573         int rlen;
574         elp_device *adapter = dev->priv;
575         void *target;
576         struct sk_buff *skb;
577         unsigned long flags;
578
579         rlen = (len + 1) & ~1;
580         skb = dev_alloc_skb(rlen + 2);
581
582         if (!skb) {
583                 printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
584                 target = adapter->dma_buffer;
585                 adapter->current_dma.target = NULL;
586                 /* FIXME: stats */
587                 return;
588         }
589
590         skb_reserve(skb, 2);
591         target = skb_put(skb, rlen);
592         if ((unsigned long)(target + rlen) >= MAX_DMA_ADDRESS) {
593                 adapter->current_dma.target = target;
594                 target = adapter->dma_buffer;
595         } else {
596                 adapter->current_dma.target = NULL;
597         }
598
599         /* if this happens, we die */
600         if (test_and_set_bit(0, (void *) &adapter->dmaing))
601                 printk(KERN_ERR "%s: rx blocked, DMA in progress, dir %d\n", dev->name, adapter->current_dma.direction);
602
603         adapter->current_dma.direction = 0;
604         adapter->current_dma.length = rlen;
605         adapter->current_dma.skb = skb;
606         adapter->current_dma.start_time = jiffies;
607
608         outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);
609
610         flags=claim_dma_lock();
611         disable_dma(dev->dma);
612         clear_dma_ff(dev->dma);
613         set_dma_mode(dev->dma, 0x04);   /* dma read */
614         set_dma_addr(dev->dma, isa_virt_to_bus(target));
615         set_dma_count(dev->dma, rlen);
616         enable_dma(dev->dma);
617         release_dma_lock(flags);
618
619         if (elp_debug >= 3) {
620                 printk(KERN_DEBUG "%s: rx DMA transfer started\n", dev->name);
621         }
622
623         if (adapter->rx_active)
624                 adapter->rx_active--;
625
626         if (!adapter->busy)
627                 printk(KERN_WARNING "%s: receive_packet called, busy not set.\n", dev->name);
628 }
629
630 /******************************************************
631  *
632  * interrupt handler
633  *
634  ******************************************************/
635
636 static irqreturn_t elp_interrupt(int irq, void *dev_id)
637 {
638         int len;
639         int dlen;
640         int icount = 0;
641         struct net_device *dev;
642         elp_device *adapter;
643         unsigned long timeout;
644
645         dev = dev_id;
646         adapter = (elp_device *) dev->priv;
647
648         spin_lock(&adapter->lock);
649
650         do {
651                 /*
652                  * has a DMA transfer finished?
653                  */
654                 if (inb_status(dev->base_addr) & DONE) {
655                         if (!adapter->dmaing) {
656                                 printk(KERN_WARNING "%s: phantom DMA completed\n", dev->name);
657                         }
658                         if (elp_debug >= 3) {
659                                 printk(KERN_DEBUG "%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
660                         }
661
662                         outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
663                         if (adapter->current_dma.direction) {
664                                 dev_kfree_skb_irq(adapter->current_dma.skb);
665                         } else {
666                                 struct sk_buff *skb = adapter->current_dma.skb;
667                                 if (skb) {
668                                         if (adapter->current_dma.target) {
669                                         /* have already done the skb_put() */
670                                         memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
671                                         }
672                                         skb->protocol = eth_type_trans(skb,dev);
673                                         dev->stats.rx_bytes += skb->len;
674                                         netif_rx(skb);
675                                         dev->last_rx = jiffies;
676                                 }
677                         }
678                         adapter->dmaing = 0;
679                         if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
680                                 int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
681                                 adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
682                                 if (elp_debug >= 2)
683                                         printk(KERN_DEBUG "%s: receiving backlogged packet (%d)\n", dev->name, t);
684                                 receive_packet(dev, t);
685                         } else {
686                                 adapter->busy = 0;
687                         }
688                 } else {
689                         /* has one timed out? */
690                         check_3c505_dma(dev);
691                 }
692
693                 /*
694                  * receive a PCB from the adapter
695                  */
696                 timeout = jiffies + 3*HZ/100;
697                 while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
698                         if (receive_pcb(dev, &adapter->irx_pcb)) {
699                                 switch (adapter->irx_pcb.command)
700                                 {
701                                 case 0:
702                                         break;
703                                         /*
704                                          * received a packet - this must be handled fast
705                                          */
706                                 case 0xff:
707                                 case CMD_RECEIVE_PACKET_COMPLETE:
708                                         /* if the device isn't open, don't pass packets up the stack */
709                                         if (!netif_running(dev))
710                                                 break;
711                                         len = adapter->irx_pcb.data.rcv_resp.pkt_len;
712                                         dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
713                                         if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
714                                                 printk(KERN_ERR "%s: interrupt - packet not received correctly\n", dev->name);
715                                         } else {
716                                                 if (elp_debug >= 3) {
717                                                         printk(KERN_DEBUG "%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
718                                                 }
719                                                 if (adapter->irx_pcb.command == 0xff) {
720                                                         if (elp_debug >= 2)
721                                                                 printk(KERN_DEBUG "%s: adding packet to backlog (len = %d)\n", dev->name, dlen);
722                                                         adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
723                                                         adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
724                                                 } else {
725                                                         receive_packet(dev, dlen);
726                                                 }
727                                                 if (elp_debug >= 3)
728                                                         printk(KERN_DEBUG "%s: packet received\n", dev->name);
729                                         }
730                                         break;
731
732                                         /*
733                                          * 82586 configured correctly
734                                          */
735                                 case CMD_CONFIGURE_82586_RESPONSE:
736                                         adapter->got[CMD_CONFIGURE_82586] = 1;
737                                         if (elp_debug >= 3)
738                                                 printk(KERN_DEBUG "%s: interrupt - configure response received\n", dev->name);
739                                         break;
740
741                                         /*
742                                          * Adapter memory configuration
743                                          */
744                                 case CMD_CONFIGURE_ADAPTER_RESPONSE:
745                                         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
746                                         if (elp_debug >= 3)
747                                                 printk(KERN_DEBUG "%s: Adapter memory configuration %s.\n", dev->name,
748                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
749                                         break;
750
751                                         /*
752                                          * Multicast list loading
753                                          */
754                                 case CMD_LOAD_MULTICAST_RESPONSE:
755                                         adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
756                                         if (elp_debug >= 3)
757                                                 printk(KERN_DEBUG "%s: Multicast address list loading %s.\n", dev->name,
758                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
759                                         break;
760
761                                         /*
762                                          * Station address setting
763                                          */
764                                 case CMD_SET_ADDRESS_RESPONSE:
765                                         adapter->got[CMD_SET_STATION_ADDRESS] = 1;
766                                         if (elp_debug >= 3)
767                                                 printk(KERN_DEBUG "%s: Ethernet address setting %s.\n", dev->name,
768                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
769                                         break;
770
771
772                                         /*
773                                          * received board statistics
774                                          */
775                                 case CMD_NETWORK_STATISTICS_RESPONSE:
776                                         dev->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
777                                         dev->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
778                                         dev->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
779                                         dev->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
780                                         dev->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
781                                         dev->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
782                                         adapter->got[CMD_NETWORK_STATISTICS] = 1;
783                                         if (elp_debug >= 3)
784                                                 printk(KERN_DEBUG "%s: interrupt - statistics response received\n", dev->name);
785                                         break;
786
787                                         /*
788                                          * sent a packet
789                                          */
790                                 case CMD_TRANSMIT_PACKET_COMPLETE:
791                                         if (elp_debug >= 3)
792                                                 printk(KERN_DEBUG "%s: interrupt - packet sent\n", dev->name);
793                                         if (!netif_running(dev))
794                                                 break;
795                                         switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
796                                         case 0xffff:
797                                                 dev->stats.tx_aborted_errors++;
798                                                 printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name);
799                                                 break;
800                                         case 0xfffe:
801                                                 dev->stats.tx_fifo_errors++;
802                                                 printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name);
803                                                 break;
804                                         }
805                                         netif_wake_queue(dev);
806                                         break;
807
808                                         /*
809                                          * some unknown PCB
810                                          */
811                                 default:
812                                         printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
813                                         break;
814                                 }
815                         } else {
816                                 printk(KERN_WARNING "%s: failed to read PCB on interrupt\n", dev->name);
817                                 adapter_reset(dev);
818                         }
819                 }
820
821         } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
822
823         prime_rx(dev);
824
825         /*
826          * indicate no longer in interrupt routine
827          */
828         spin_unlock(&adapter->lock);
829         return IRQ_HANDLED;
830 }
831
832
833 /******************************************************
834  *
835  * open the board
836  *
837  ******************************************************/
838
839 static int elp_open(struct net_device *dev)
840 {
841         elp_device *adapter;
842         int retval;
843
844         adapter = dev->priv;
845
846         if (elp_debug >= 3)
847                 printk(KERN_DEBUG "%s: request to open device\n", dev->name);
848
849         /*
850          * make sure we actually found the device
851          */
852         if (adapter == NULL) {
853                 printk(KERN_ERR "%s: Opening a non-existent physical device\n", dev->name);
854                 return -EAGAIN;
855         }
856         /*
857          * disable interrupts on the board
858          */
859         outb_control(0, dev);
860
861         /*
862          * clear any pending interrupts
863          */
864         inb_command(dev->base_addr);
865         adapter_reset(dev);
866
867         /*
868          * no receive PCBs active
869          */
870         adapter->rx_active = 0;
871
872         adapter->busy = 0;
873         adapter->send_pcb_semaphore = 0;
874         adapter->rx_backlog.in = 0;
875         adapter->rx_backlog.out = 0;
876
877         spin_lock_init(&adapter->lock);
878
879         /*
880          * install our interrupt service routine
881          */
882         if ((retval = request_irq(dev->irq, &elp_interrupt, 0, dev->name, dev))) {
883                 printk(KERN_ERR "%s: could not allocate IRQ%d\n", dev->name, dev->irq);
884                 return retval;
885         }
886         if ((retval = request_dma(dev->dma, dev->name))) {
887                 free_irq(dev->irq, dev);
888                 printk(KERN_ERR "%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
889                 return retval;
890         }
891         adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
892         if (!adapter->dma_buffer) {
893                 printk(KERN_ERR "%s: could not allocate DMA buffer\n", dev->name);
894                 free_dma(dev->dma);
895                 free_irq(dev->irq, dev);
896                 return -ENOMEM;
897         }
898         adapter->dmaing = 0;
899
900         /*
901          * enable interrupts on the board
902          */
903         outb_control(CMDE, dev);
904
905         /*
906          * configure adapter memory: we need 10 multicast addresses, default==0
907          */
908         if (elp_debug >= 3)
909                 printk(KERN_DEBUG "%s: sending 3c505 memory configuration command\n", dev->name);
910         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
911         adapter->tx_pcb.data.memconf.cmd_q = 10;
912         adapter->tx_pcb.data.memconf.rcv_q = 20;
913         adapter->tx_pcb.data.memconf.mcast = 10;
914         adapter->tx_pcb.data.memconf.frame = 20;
915         adapter->tx_pcb.data.memconf.rcv_b = 20;
916         adapter->tx_pcb.data.memconf.progs = 0;
917         adapter->tx_pcb.length = sizeof(struct Memconf);
918         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
919         if (!send_pcb(dev, &adapter->tx_pcb))
920                 printk(KERN_ERR "%s: couldn't send memory configuration command\n", dev->name);
921         else {
922                 unsigned long timeout = jiffies + TIMEOUT;
923                 while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
924                 if (time_after_eq(jiffies, timeout))
925                         TIMEOUT_MSG(__LINE__);
926         }
927
928
929         /*
930          * configure adapter to receive broadcast messages and wait for response
931          */
932         if (elp_debug >= 3)
933                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
934         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
935         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
936         adapter->tx_pcb.length = 2;
937         adapter->got[CMD_CONFIGURE_82586] = 0;
938         if (!send_pcb(dev, &adapter->tx_pcb))
939                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
940         else {
941                 unsigned long timeout = jiffies + TIMEOUT;
942                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
943                 if (time_after_eq(jiffies, timeout))
944                         TIMEOUT_MSG(__LINE__);
945         }
946
947         /* enable burst-mode DMA */
948         /* outb(0x1, dev->base_addr + PORT_AUXDMA); */
949
950         /*
951          * queue receive commands to provide buffering
952          */
953         prime_rx(dev);
954         if (elp_debug >= 3)
955                 printk(KERN_DEBUG "%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
956
957         /*
958          * device is now officially open!
959          */
960
961         netif_start_queue(dev);
962         return 0;
963 }
964
965
966 /******************************************************
967  *
968  * send a packet to the adapter
969  *
970  ******************************************************/
971
972 static bool send_packet(struct net_device *dev, struct sk_buff *skb)
973 {
974         elp_device *adapter = dev->priv;
975         unsigned long target;
976         unsigned long flags;
977
978         /*
979          * make sure the length is even and no shorter than 60 bytes
980          */
981         unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
982
983         if (test_and_set_bit(0, (void *) &adapter->busy)) {
984                 if (elp_debug >= 2)
985                         printk(KERN_DEBUG "%s: transmit blocked\n", dev->name);
986                 return false;
987         }
988
989         dev->stats.tx_bytes += nlen;
990
991         /*
992          * send the adapter a transmit packet command. Ignore segment and offset
993          * and make sure the length is even
994          */
995         adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
996         adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
997         adapter->tx_pcb.data.xmit_pkt.buf_ofs
998             = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0;        /* Unused */
999         adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;
1000
1001         if (!send_pcb(dev, &adapter->tx_pcb)) {
1002                 adapter->busy = 0;
1003                 return false;
1004         }
1005         /* if this happens, we die */
1006         if (test_and_set_bit(0, (void *) &adapter->dmaing))
1007                 printk(KERN_DEBUG "%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
1008
1009         adapter->current_dma.direction = 1;
1010         adapter->current_dma.start_time = jiffies;
1011
1012         if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) {
1013                 skb_copy_from_linear_data(skb, adapter->dma_buffer, nlen);
1014                 memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len);
1015                 target = isa_virt_to_bus(adapter->dma_buffer);
1016         }
1017         else {
1018                 target = isa_virt_to_bus(skb->data);
1019         }
1020         adapter->current_dma.skb = skb;
1021
1022         flags=claim_dma_lock();
1023         disable_dma(dev->dma);
1024         clear_dma_ff(dev->dma);
1025         set_dma_mode(dev->dma, 0x48);   /* dma memory -> io */
1026         set_dma_addr(dev->dma, target);
1027         set_dma_count(dev->dma, nlen);
1028         outb_control(adapter->hcr_val | DMAE | TCEN, dev);
1029         enable_dma(dev->dma);
1030         release_dma_lock(flags);
1031
1032         if (elp_debug >= 3)
1033                 printk(KERN_DEBUG "%s: DMA transfer started\n", dev->name);
1034
1035         return true;
1036 }
1037
1038 /*
1039  *      The upper layer thinks we timed out
1040  */
1041
1042 static void elp_timeout(struct net_device *dev)
1043 {
1044         int stat;
1045
1046         stat = inb_status(dev->base_addr);
1047         printk(KERN_WARNING "%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
1048         if (elp_debug >= 1)
1049                 printk(KERN_DEBUG "%s: status %#02x\n", dev->name, stat);
1050         dev->trans_start = jiffies;
1051         dev->stats.tx_dropped++;
1052         netif_wake_queue(dev);
1053 }
1054
1055 /******************************************************
1056  *
1057  * start the transmitter
1058  *    return 0 if sent OK, else return 1
1059  *
1060  ******************************************************/
1061
1062 static int elp_start_xmit(struct sk_buff *skb, struct net_device *dev)
1063 {
1064         unsigned long flags;
1065         elp_device *adapter = dev->priv;
1066
1067         spin_lock_irqsave(&adapter->lock, flags);
1068         check_3c505_dma(dev);
1069
1070         if (elp_debug >= 3)
1071                 printk(KERN_DEBUG "%s: request to send packet of length %d\n", dev->name, (int) skb->len);
1072
1073         netif_stop_queue(dev);
1074
1075         /*
1076          * send the packet at skb->data for skb->len
1077          */
1078         if (!send_packet(dev, skb)) {
1079                 if (elp_debug >= 2) {
1080                         printk(KERN_DEBUG "%s: failed to transmit packet\n", dev->name);
1081                 }
1082                 spin_unlock_irqrestore(&adapter->lock, flags);
1083                 return 1;
1084         }
1085         if (elp_debug >= 3)
1086                 printk(KERN_DEBUG "%s: packet of length %d sent\n", dev->name, (int) skb->len);
1087
1088         /*
1089          * start the transmit timeout
1090          */
1091         dev->trans_start = jiffies;
1092
1093         prime_rx(dev);
1094         spin_unlock_irqrestore(&adapter->lock, flags);
1095         netif_start_queue(dev);
1096         return 0;
1097 }
1098
1099 /******************************************************
1100  *
1101  * return statistics on the board
1102  *
1103  ******************************************************/
1104
1105 static struct net_device_stats *elp_get_stats(struct net_device *dev)
1106 {
1107         elp_device *adapter = (elp_device *) dev->priv;
1108
1109         if (elp_debug >= 3)
1110                 printk(KERN_DEBUG "%s: request for stats\n", dev->name);
1111
1112         /* If the device is closed, just return the latest stats we have,
1113            - we cannot ask from the adapter without interrupts */
1114         if (!netif_running(dev))
1115                 return &dev->stats;
1116
1117         /* send a get statistics command to the board */
1118         adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
1119         adapter->tx_pcb.length = 0;
1120         adapter->got[CMD_NETWORK_STATISTICS] = 0;
1121         if (!send_pcb(dev, &adapter->tx_pcb))
1122                 printk(KERN_ERR "%s: couldn't send get statistics command\n", dev->name);
1123         else {
1124                 unsigned long timeout = jiffies + TIMEOUT;
1125                 while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && time_before(jiffies, timeout));
1126                 if (time_after_eq(jiffies, timeout)) {
1127                         TIMEOUT_MSG(__LINE__);
1128                         return &dev->stats;
1129                 }
1130         }
1131
1132         /* statistics are now up to date */
1133         return &dev->stats;
1134 }
1135
1136
1137 static void netdev_get_drvinfo(struct net_device *dev,
1138                                struct ethtool_drvinfo *info)
1139 {
1140         strcpy(info->driver, DRV_NAME);
1141         strcpy(info->version, DRV_VERSION);
1142         sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
1143 }
1144
1145 static u32 netdev_get_msglevel(struct net_device *dev)
1146 {
1147         return debug;
1148 }
1149
1150 static void netdev_set_msglevel(struct net_device *dev, u32 level)
1151 {
1152         debug = level;
1153 }
1154
1155 static const struct ethtool_ops netdev_ethtool_ops = {
1156         .get_drvinfo            = netdev_get_drvinfo,
1157         .get_msglevel           = netdev_get_msglevel,
1158         .set_msglevel           = netdev_set_msglevel,
1159 };
1160
1161 /******************************************************
1162  *
1163  * close the board
1164  *
1165  ******************************************************/
1166
1167 static int elp_close(struct net_device *dev)
1168 {
1169         elp_device *adapter;
1170
1171         adapter = dev->priv;
1172
1173         if (elp_debug >= 3)
1174                 printk(KERN_DEBUG "%s: request to close device\n", dev->name);
1175
1176         netif_stop_queue(dev);
1177
1178         /* Someone may request the device statistic information even when
1179          * the interface is closed. The following will update the statistics
1180          * structure in the driver, so we'll be able to give current statistics.
1181          */
1182         (void) elp_get_stats(dev);
1183
1184         /*
1185          * disable interrupts on the board
1186          */
1187         outb_control(0, dev);
1188
1189         /*
1190          * release the IRQ
1191          */
1192         free_irq(dev->irq, dev);
1193
1194         free_dma(dev->dma);
1195         free_pages((unsigned long) adapter->dma_buffer, get_order(DMA_BUFFER_SIZE));
1196
1197         return 0;
1198 }
1199
1200
1201 /************************************************************
1202  *
1203  * Set multicast list
1204  * num_addrs==0: clear mc_list
1205  * num_addrs==-1: set promiscuous mode
1206  * num_addrs>0: set mc_list
1207  *
1208  ************************************************************/
1209
1210 static void elp_set_mc_list(struct net_device *dev)
1211 {
1212         elp_device *adapter = (elp_device *) dev->priv;
1213         struct dev_mc_list *dmi = dev->mc_list;
1214         int i;
1215         unsigned long flags;
1216
1217         if (elp_debug >= 3)
1218                 printk(KERN_DEBUG "%s: request to set multicast list\n", dev->name);
1219
1220         spin_lock_irqsave(&adapter->lock, flags);
1221
1222         if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1223                 /* send a "load multicast list" command to the board, max 10 addrs/cmd */
1224                 /* if num_addrs==0 the list will be cleared */
1225                 adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
1226                 adapter->tx_pcb.length = 6 * dev->mc_count;
1227                 for (i = 0; i < dev->mc_count; i++) {
1228                         memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
1229                         dmi = dmi->next;
1230                 }
1231                 adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
1232                 if (!send_pcb(dev, &adapter->tx_pcb))
1233                         printk(KERN_ERR "%s: couldn't send set_multicast command\n", dev->name);
1234                 else {
1235                         unsigned long timeout = jiffies + TIMEOUT;
1236                         while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && time_before(jiffies, timeout));
1237                         if (time_after_eq(jiffies, timeout)) {
1238                                 TIMEOUT_MSG(__LINE__);
1239                         }
1240                 }
1241                 if (dev->mc_count)
1242                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
1243                 else            /* num_addrs == 0 */
1244                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1245         } else
1246                 adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
1247         /*
1248          * configure adapter to receive messages (as specified above)
1249          * and wait for response
1250          */
1251         if (elp_debug >= 3)
1252                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
1253         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1254         adapter->tx_pcb.length = 2;
1255         adapter->got[CMD_CONFIGURE_82586] = 0;
1256         if (!send_pcb(dev, &adapter->tx_pcb))
1257         {
1258                 spin_unlock_irqrestore(&adapter->lock, flags);
1259                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
1260         }
1261         else {
1262                 unsigned long timeout = jiffies + TIMEOUT;
1263                 spin_unlock_irqrestore(&adapter->lock, flags);
1264                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
1265                 if (time_after_eq(jiffies, timeout))
1266                         TIMEOUT_MSG(__LINE__);
1267         }
1268 }
1269
1270 /************************************************************
1271  *
1272  * A couple of tests to see if there's 3C505 or not
1273  * Called only by elp_autodetect
1274  ************************************************************/
1275
1276 static int __init elp_sense(struct net_device *dev)
1277 {
1278         int addr = dev->base_addr;
1279         const char *name = dev->name;
1280         byte orig_HSR;
1281
1282         if (!request_region(addr, ELP_IO_EXTENT, "3c505"))
1283                 return -ENODEV;
1284
1285         orig_HSR = inb_status(addr);
1286
1287         if (elp_debug > 0)
1288                 printk(search_msg, name, addr);
1289
1290         if (orig_HSR == 0xff) {
1291                 if (elp_debug > 0)
1292                         printk(notfound_msg, 1);
1293                 goto out;
1294         }
1295
1296         /* Wait for a while; the adapter may still be booting up */
1297         if (elp_debug > 0)
1298                 printk(stilllooking_msg);
1299
1300         if (orig_HSR & DIR) {
1301                 /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
1302                 outb(0, dev->base_addr + PORT_CONTROL);
1303                 msleep(300);
1304                 if (inb_status(addr) & DIR) {
1305                         if (elp_debug > 0)
1306                                 printk(notfound_msg, 2);
1307                         goto out;
1308                 }
1309         } else {
1310                 /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
1311                 outb(DIR, dev->base_addr + PORT_CONTROL);
1312                 msleep(300);
1313                 if (!(inb_status(addr) & DIR)) {
1314                         if (elp_debug > 0)
1315                                 printk(notfound_msg, 3);
1316                         goto out;
1317                 }
1318         }
1319         /*
1320          * It certainly looks like a 3c505.
1321          */
1322         if (elp_debug > 0)
1323                 printk(found_msg);
1324
1325         return 0;
1326 out:
1327         release_region(addr, ELP_IO_EXTENT);
1328         return -ENODEV;
1329 }
1330
1331 /*************************************************************
1332  *
1333  * Search through addr_list[] and try to find a 3C505
1334  * Called only by eplus_probe
1335  *************************************************************/
1336
1337 static int __init elp_autodetect(struct net_device *dev)
1338 {
1339         int idx = 0;
1340
1341         /* if base address set, then only check that address
1342            otherwise, run through the table */
1343         if (dev->base_addr != 0) {      /* dev->base_addr == 0 ==> plain autodetect */
1344                 if (elp_sense(dev) == 0)
1345                         return dev->base_addr;
1346         } else
1347                 while ((dev->base_addr = addr_list[idx++])) {
1348                         if (elp_sense(dev) == 0)
1349                                 return dev->base_addr;
1350                 }
1351
1352         /* could not find an adapter */
1353         if (elp_debug > 0)
1354                 printk(couldnot_msg, dev->name);
1355
1356         return 0;               /* Because of this, the layer above will return -ENODEV */
1357 }
1358
1359
1360 /******************************************************
1361  *
1362  * probe for an Etherlink Plus board at the specified address
1363  *
1364  ******************************************************/
1365
1366 /* There are three situations we need to be able to detect here:
1367
1368  *  a) the card is idle
1369  *  b) the card is still booting up
1370  *  c) the card is stuck in a strange state (some DOS drivers do this)
1371  *
1372  * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
1373  * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
1374  * loop round, and hope for the best.
1375  *
1376  * This is all very unpleasant, but hopefully avoids the problems with the old
1377  * probe code (which had a 15-second delay if the card was idle, and didn't
1378  * work at all if it was in a weird state).
1379  */
1380
1381 static int __init elplus_setup(struct net_device *dev)
1382 {
1383         elp_device *adapter = dev->priv;
1384         int i, tries, tries1, okay;
1385         unsigned long timeout;
1386         unsigned long cookie = 0;
1387         int err = -ENODEV;
1388         DECLARE_MAC_BUF(mac);
1389
1390         /*
1391          *  setup adapter structure
1392          */
1393
1394         dev->base_addr = elp_autodetect(dev);
1395         if (!dev->base_addr)
1396                 return -ENODEV;
1397
1398         adapter->send_pcb_semaphore = 0;
1399
1400         for (tries1 = 0; tries1 < 3; tries1++) {
1401                 outb_control((adapter->hcr_val | CMDE) & ~DIR, dev);
1402                 /* First try to write just one byte, to see if the card is
1403                  * responding at all normally.
1404                  */
1405                 timeout = jiffies + 5*HZ/100;
1406                 okay = 0;
1407                 while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1408                 if ((inb_status(dev->base_addr) & HCRE)) {
1409                         outb_command(0, dev->base_addr);        /* send a spurious byte */
1410                         timeout = jiffies + 5*HZ/100;
1411                         while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1412                         if (inb_status(dev->base_addr) & HCRE)
1413                                 okay = 1;
1414                 }
1415                 if (!okay) {
1416                         /* Nope, it's ignoring the command register.  This means that
1417                          * either it's still booting up, or it's died.
1418                          */
1419                         printk(KERN_ERR "%s: command register wouldn't drain, ", dev->name);
1420                         if ((inb_status(dev->base_addr) & 7) == 3) {
1421                                 /* If the adapter status is 3, it *could* still be booting.
1422                                  * Give it the benefit of the doubt for 10 seconds.
1423                                  */
1424                                 printk("assuming 3c505 still starting\n");
1425                                 timeout = jiffies + 10*HZ;
1426                                 while (time_before(jiffies, timeout) && (inb_status(dev->base_addr) & 7));
1427                                 if (inb_status(dev->base_addr) & 7) {
1428                                         printk(KERN_ERR "%s: 3c505 failed to start\n", dev->name);
1429                                 } else {
1430                                         okay = 1;  /* It started */
1431                                 }
1432                         } else {
1433                                 /* Otherwise, it must just be in a strange
1434                                  * state.  We probably need to kick it.
1435                                  */
1436                                 printk("3c505 is sulking\n");
1437                         }
1438                 }
1439                 for (tries = 0; tries < 5 && okay; tries++) {
1440
1441                         /*
1442                          * Try to set the Ethernet address, to make sure that the board
1443                          * is working.
1444                          */
1445                         adapter->tx_pcb.command = CMD_STATION_ADDRESS;
1446                         adapter->tx_pcb.length = 0;
1447                         cookie = probe_irq_on();
1448                         if (!send_pcb(dev, &adapter->tx_pcb)) {
1449                                 printk(KERN_ERR "%s: could not send first PCB\n", dev->name);
1450                                 probe_irq_off(cookie);
1451                                 continue;
1452                         }
1453                         if (!receive_pcb(dev, &adapter->rx_pcb)) {
1454                                 printk(KERN_ERR "%s: could not read first PCB\n", dev->name);
1455                                 probe_irq_off(cookie);
1456                                 continue;
1457                         }
1458                         if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
1459                             (adapter->rx_pcb.length != 6)) {
1460                                 printk(KERN_ERR "%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
1461                                 probe_irq_off(cookie);
1462                                 continue;
1463                         }
1464                         goto okay;
1465                 }
1466                 /* It's broken.  Do a hard reset to re-initialise the board,
1467                  * and try again.
1468                  */
1469                 printk(KERN_INFO "%s: resetting adapter\n", dev->name);
1470                 outb_control(adapter->hcr_val | FLSH | ATTN, dev);
1471                 outb_control(adapter->hcr_val & ~(FLSH | ATTN), dev);
1472         }
1473         printk(KERN_ERR "%s: failed to initialise 3c505\n", dev->name);
1474         goto out;
1475
1476       okay:
1477         if (dev->irq) {         /* Is there a preset IRQ? */
1478                 int rpt = probe_irq_off(cookie);
1479                 if (dev->irq != rpt) {
1480                         printk(KERN_WARNING "%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
1481                 }
1482                 /* if dev->irq == probe_irq_off(cookie), all is well */
1483         } else                 /* No preset IRQ; just use what we can detect */
1484                 dev->irq = probe_irq_off(cookie);
1485         switch (dev->irq) {    /* Legal, sane? */
1486         case 0:
1487                 printk(KERN_ERR "%s: IRQ probe failed: check 3c505 jumpers.\n",
1488                        dev->name);
1489                 goto out;
1490         case 1:
1491         case 6:
1492         case 8:
1493         case 13:
1494                 printk(KERN_ERR "%s: Impossible IRQ %d reported by probe_irq_off().\n",
1495                        dev->name, dev->irq);
1496                        goto out;
1497         }
1498         /*
1499          *  Now we have the IRQ number so we can disable the interrupts from
1500          *  the board until the board is opened.
1501          */
1502         outb_control(adapter->hcr_val & ~CMDE, dev);
1503
1504         /*
1505          * copy Ethernet address into structure
1506          */
1507         for (i = 0; i < 6; i++)
1508                 dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
1509
1510         /* find a DMA channel */
1511         if (!dev->dma) {
1512                 if (dev->mem_start) {
1513                         dev->dma = dev->mem_start & 7;
1514                 }
1515                 else {
1516                         printk(KERN_WARNING "%s: warning, DMA channel not specified, using default\n", dev->name);
1517                         dev->dma = ELP_DMA;
1518                 }
1519         }
1520
1521         /*
1522          * print remainder of startup message
1523          */
1524         printk(KERN_INFO "%s: 3c505 at %#lx, irq %d, dma %d, "
1525                "addr %s, ",
1526                dev->name, dev->base_addr, dev->irq, dev->dma,
1527                print_mac(mac, dev->dev_addr));
1528
1529         /*
1530          * read more information from the adapter
1531          */
1532
1533         adapter->tx_pcb.command = CMD_ADAPTER_INFO;
1534         adapter->tx_pcb.length = 0;
1535         if (!send_pcb(dev, &adapter->tx_pcb) ||
1536             !receive_pcb(dev, &adapter->rx_pcb) ||
1537             (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
1538             (adapter->rx_pcb.length != 10)) {
1539                 printk("not responding to second PCB\n");
1540         }
1541         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);
1542
1543         /*
1544          * reconfigure the adapter memory to better suit our purposes
1545          */
1546         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
1547         adapter->tx_pcb.length = 12;
1548         adapter->tx_pcb.data.memconf.cmd_q = 8;
1549         adapter->tx_pcb.data.memconf.rcv_q = 8;
1550         adapter->tx_pcb.data.memconf.mcast = 10;
1551         adapter->tx_pcb.data.memconf.frame = 10;
1552         adapter->tx_pcb.data.memconf.rcv_b = 10;
1553         adapter->tx_pcb.data.memconf.progs = 0;
1554         if (!send_pcb(dev, &adapter->tx_pcb) ||
1555             !receive_pcb(dev, &adapter->rx_pcb) ||
1556             (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
1557             (adapter->rx_pcb.length != 2)) {
1558                 printk(KERN_ERR "%s: could not configure adapter memory\n", dev->name);
1559         }
1560         if (adapter->rx_pcb.data.configure) {
1561                 printk(KERN_ERR "%s: adapter configuration failed\n", dev->name);
1562         }
1563
1564         dev->open = elp_open;                           /* local */
1565         dev->stop = elp_close;                          /* local */
1566         dev->get_stats = elp_get_stats;                 /* local */
1567         dev->hard_start_xmit = elp_start_xmit;          /* local */
1568         dev->tx_timeout = elp_timeout;                  /* local */
1569         dev->watchdog_timeo = 10*HZ;
1570         dev->set_multicast_list = elp_set_mc_list;      /* local */
1571         dev->ethtool_ops = &netdev_ethtool_ops;         /* local */
1572
1573         dev->mem_start = dev->mem_end = 0;
1574
1575         err = register_netdev(dev);
1576         if (err)
1577                 goto out;
1578
1579         return 0;
1580 out:
1581         release_region(dev->base_addr, ELP_IO_EXTENT);
1582         return err;
1583 }
1584
1585 #ifndef MODULE
1586 struct net_device * __init elplus_probe(int unit)
1587 {
1588         struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1589         int err;
1590         if (!dev)
1591                 return ERR_PTR(-ENOMEM);
1592
1593         sprintf(dev->name, "eth%d", unit);
1594         netdev_boot_setup_check(dev);
1595
1596         err = elplus_setup(dev);
1597         if (err) {
1598                 free_netdev(dev);
1599                 return ERR_PTR(err);
1600         }
1601         return dev;
1602 }
1603
1604 #else
1605 static struct net_device *dev_3c505[ELP_MAX_CARDS];
1606 static int io[ELP_MAX_CARDS];
1607 static int irq[ELP_MAX_CARDS];
1608 static int dma[ELP_MAX_CARDS];
1609 module_param_array(io, int, NULL, 0);
1610 module_param_array(irq, int, NULL, 0);
1611 module_param_array(dma, int, NULL, 0);
1612 MODULE_PARM_DESC(io, "EtherLink Plus I/O base address(es)");
1613 MODULE_PARM_DESC(irq, "EtherLink Plus IRQ number(s) (assigned)");
1614 MODULE_PARM_DESC(dma, "EtherLink Plus DMA channel(s)");
1615
1616 int __init init_module(void)
1617 {
1618         int this_dev, found = 0;
1619
1620         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1621                 struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1622                 if (!dev)
1623                         break;
1624
1625                 dev->irq = irq[this_dev];
1626                 dev->base_addr = io[this_dev];
1627                 if (dma[this_dev]) {
1628                         dev->dma = dma[this_dev];
1629                 } else {
1630                         dev->dma = ELP_DMA;
1631                         printk(KERN_WARNING "3c505.c: warning, using default DMA channel,\n");
1632                 }
1633                 if (io[this_dev] == 0) {
1634                         if (this_dev) {
1635                                 free_netdev(dev);
1636                                 break;
1637                         }
1638                         printk(KERN_NOTICE "3c505.c: module autoprobe not recommended, give io=xx.\n");
1639                 }
1640                 if (elplus_setup(dev) != 0) {
1641                         printk(KERN_WARNING "3c505.c: Failed to register card at 0x%x.\n", io[this_dev]);
1642                         free_netdev(dev);
1643                         break;
1644                 }
1645                 dev_3c505[this_dev] = dev;
1646                 found++;
1647         }
1648         if (!found)
1649                 return -ENODEV;
1650         return 0;
1651 }
1652
1653 void __exit cleanup_module(void)
1654 {
1655         int this_dev;
1656
1657         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1658                 struct net_device *dev = dev_3c505[this_dev];
1659                 if (dev) {
1660                         unregister_netdev(dev);
1661                         release_region(dev->base_addr, ELP_IO_EXTENT);
1662                         free_netdev(dev);
1663                 }
1664         }
1665 }
1666
1667 #endif                          /* MODULE */
1668 MODULE_LICENSE("GPL");