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