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1.1 root 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 1.1 1999/04/26 05:51:48 tb Exp $
14: *
15: * Authors: Linux 3c505 device driver by
16: * Craig Southeren, <[email protected]>
17: * Final debugging by
18: * Andrew Tridgell, <[email protected]>
19: * Auto irq/address, tuning, cleanup and v1.1.4+ kernel mods by
20: * Juha Laiho, <[email protected]>
21: * Linux 3C509 driver by
22: * Donald Becker, <[email protected]>
23: * Crynwr packet driver by
24: * Krishnan Gopalan and Gregg Stefancik,
25: * Clemson University Engineering Computer Operations.
26: * Portions of the code have been adapted from the 3c505
27: * driver for NCSA Telnet by Bruce Orchard and later
28: * modified by Warren Van Houten and [email protected].
29: * 3C505 technical information provided by
30: * Terry Murphy, of 3Com Network Adapter Division
31: * Linux 1.3.0 changes by
32: * Alan Cox <[email protected]>
33: * More debugging and DMA version by Philip Blundell
34: */
35:
36: /* Theory of operation:
37:
38: * The 3c505 is quite an intelligent board. All communication with it is done
39: * by means of Primary Command Blocks (PCBs); these are transferred using PIO
40: * through the command register. The card has 256k of on-board RAM, which is
41: * used to buffer received packets. It might seem at first that more buffers
42: * are better, but in fact this isn't true. From my tests, it seems that
43: * more than about 10 buffers are unnecessary, and there is a noticeable
44: * performance hit in having more active on the card. So the majority of the
45: * card's memory isn't, in fact, used.
46: *
47: * We keep up to 4 "receive packet" commands active on the board at a time.
48: * When a packet comes in, so long as there is a receive command active, the
49: * board will send us a "packet received" PCB and then add the data for that
50: * packet to the DMA queue. If a DMA transfer is not already in progress, we
51: * set one up to start uploading the data. We have to maintain a list of
52: * backlogged receive packets, because the card may decide to tell us about
53: * a newly-arrived packet at any time, and we may not be able to start a DMA
54: * transfer immediately (ie one may already be going on). We can't NAK the
55: * PCB, because then it would throw the packet away.
56: *
57: * Trying to send a PCB to the card at the wrong moment seems to have bad
58: * effects. If we send it a transmit PCB while a receive DMA is happening,
59: * it will just NAK the PCB and so we will have wasted our time. Worse, it
60: * sometimes seems to interrupt the transfer. The majority of the low-level
61: * code is protected by one huge semaphore -- "busy" -- which is set whenever
62: * it probably isn't safe to do anything to the card. The receive routine
63: * must gain a lock on "busy" before it can start a DMA transfer, and the
64: * transmit routine must gain a lock before it sends the first PCB to the card.
65: * The send_pcb() routine also has an internal semaphore to protect it against
66: * being re-entered (which would be disastrous) -- this is needed because
67: * several things can happen asynchronously (re-priming the receiver and
68: * asking the card for statistics, for example). send_pcb() will also refuse
69: * to talk to the card at all if a DMA upload is happening. The higher-level
70: * networking code will reschedule a later retry if some part of the driver
71: * is blocked. In practice, this doesn't seem to happen very often.
72: */
73:
74: /* This driver will not work with revision 2 hardware, because the host
75: * control register is write-only. It should be fairly easy to arrange to
76: * keep our own soft-copy of the intended contents of this register, if
77: * somebody has the time. There may be firmware differences that cause
78: * other problems, though, and I don't have an old card to test.
79: */
80:
81: /* The driver is a mess. I took Craig's and Juha's code, and hacked it firstly
82: * to make it more reliable, and secondly to add DMA mode. Many things could
83: * probably be done better; the concurrency protection is particularly awful.
84: */
85:
86: #include <linux/module.h>
87:
88: #include <linux/kernel.h>
89: #include <linux/sched.h>
90: #include <linux/string.h>
91: #include <linux/interrupt.h>
92: #include <linux/ptrace.h>
93: #include <linux/errno.h>
94: #include <linux/in.h>
95: #include <linux/malloc.h>
96: #include <linux/ioport.h>
97: #include <asm/bitops.h>
98: #include <asm/io.h>
99: #include <asm/dma.h>
100:
101: #include <linux/netdevice.h>
102: #include <linux/etherdevice.h>
103: #include <linux/skbuff.h>
104:
105: #include "3c505.h"
106:
107: #define ELP_DMA 6 /* DMA channel to use */
108: #define ELP_RX_PCBS 4
109:
110: /*********************************************************
111: *
112: * define debug messages here as common strings to reduce space
113: *
114: *********************************************************/
115:
116: static const char *filename = __FILE__;
117:
118: static const char *timeout_msg = "*** timeout at %s:%s (line %d) ***\n";
119: #define TIMEOUT_MSG(lineno) \
120: printk(timeout_msg, filename,__FUNCTION__,(lineno))
121:
122: static const char *invalid_pcb_msg =
123: "*** invalid pcb length %d at %s:%s (line %d) ***\n";
124: #define INVALID_PCB_MSG(len) \
125: printk(invalid_pcb_msg, (len),filename,__FUNCTION__,__LINE__)
126:
127: static const char *search_msg = "%s: Looking for 3c505 adapter at address %#x...";
128:
129: static const char *stilllooking_msg = "still looking...";
130:
131: static const char *found_msg = "found.\n";
132:
133: static const char *notfound_msg = "not found (reason = %d)\n";
134:
135: static const char *couldnot_msg = "%s: 3c505 not found\n";
136:
137: /*********************************************************
138: *
139: * various other debug stuff
140: *
141: *********************************************************/
142:
143: #ifdef ELP_DEBUG
144: static const int elp_debug = ELP_DEBUG;
145: #else
146: static const int elp_debug = 0;
147: #endif
148:
149: /*
150: * 0 = no messages (well, some)
151: * 1 = messages when high level commands performed
152: * 2 = messages when low level commands performed
153: * 3 = messages when interrupts received
154: */
155:
156: /*****************************************************************
157: *
158: * useful macros
159: *
160: *****************************************************************/
161:
162: #ifndef TRUE
163: #define TRUE 1
164: #endif
165:
166: #ifndef FALSE
167: #define FALSE 0
168: #endif
169:
170:
171: /*****************************************************************
172: *
173: * List of I/O-addresses we try to auto-sense
174: * Last element MUST BE 0!
175: *****************************************************************/
176:
177: const int addr_list[] = {0x300, 0x280, 0x310, 0};
178:
179: /* Dma Memory related stuff */
180:
181: /* Pure 2^n version of get_order */
182: static inline int __get_order(unsigned long size)
183: {
184: int order;
185:
186: size = (size - 1) >> (PAGE_SHIFT - 1);
187: order = -1;
188: do {
189: size >>= 1;
190: order++;
191: } while (size);
192: return order;
193: }
194:
195: static unsigned long dma_mem_alloc(int size)
196: {
197: int order = __get_order(size);
198:
199: return __get_dma_pages(GFP_KERNEL, order);
200: }
201:
202:
203: /*****************************************************************
204: *
205: * Functions for I/O (note the inline !)
206: *
207: *****************************************************************/
208:
209: static inline unsigned char inb_status(unsigned int base_addr)
210: {
211: return inb(base_addr + PORT_STATUS);
212: }
213:
214: static inline unsigned char inb_control(unsigned int base_addr)
215: {
216: return inb(base_addr + PORT_CONTROL);
217: }
218:
219: static inline int inb_command(unsigned int base_addr)
220: {
221: return inb(base_addr + PORT_COMMAND);
222: }
223:
224: static inline void outb_control(unsigned char val, unsigned int base_addr)
225: {
226: outb(val, base_addr + PORT_CONTROL);
227: }
228:
229: static inline void outb_command(unsigned char val, unsigned int base_addr)
230: {
231: outb(val, base_addr + PORT_COMMAND);
232: }
233:
234: static inline unsigned int inw_data(unsigned int base_addr)
235: {
236: return inw(base_addr + PORT_DATA);
237: }
238:
239: static inline void outw_data(unsigned int val, unsigned int base_addr)
240: {
241: outw(val, base_addr + PORT_DATA);
242: }
243:
244:
245: /*****************************************************************
246: *
247: * structure to hold context information for adapter
248: *
249: *****************************************************************/
250:
251: #define DMA_BUFFER_SIZE 1600
252: #define BACKLOG_SIZE 4
253:
254: typedef struct {
255: volatile short got[NUM_TRANSMIT_CMDS]; /* flags for command completion */
256: pcb_struct tx_pcb; /* PCB for foreground sending */
257: pcb_struct rx_pcb; /* PCB for foreground receiving */
258: pcb_struct itx_pcb; /* PCB for background sending */
259: pcb_struct irx_pcb; /* PCB for background receiving */
260: struct enet_statistics stats;
261:
262: void *dma_buffer;
263:
264: struct {
265: unsigned int length[BACKLOG_SIZE];
266: unsigned int in;
267: unsigned int out;
268: } rx_backlog;
269:
270: struct {
271: unsigned int direction;
272: unsigned int length;
273: unsigned int copy_flag;
274: struct sk_buff *skb;
275: long int start_time;
276: } current_dma;
277:
278: /* flags */
279: unsigned long send_pcb_semaphore;
280: unsigned int dmaing;
281: unsigned long busy;
282:
283: unsigned int rx_active; /* number of receive PCBs */
284: } elp_device;
285:
286: static inline unsigned int backlog_next(unsigned int n)
287: {
288: return (n + 1) % BACKLOG_SIZE;
289: }
290:
291: /*****************************************************************
292: *
293: * useful functions for accessing the adapter
294: *
295: *****************************************************************/
296:
297: /*
298: * use this routine when accessing the ASF bits as they are
299: * changed asynchronously by the adapter
300: */
301:
302: /* get adapter PCB status */
303: #define GET_ASF(addr) \
304: (get_status(addr)&ASF_PCB_MASK)
305:
306: static inline int get_status(unsigned int base_addr)
307: {
308: int timeout = jiffies + 10;
309: register int stat1;
310: do {
311: stat1 = inb_status(base_addr);
312: } while (stat1 != inb_status(base_addr) && jiffies < timeout);
313: if (jiffies >= timeout)
314: TIMEOUT_MSG(__LINE__);
315: return stat1;
316: }
317:
318: static inline void set_hsf(unsigned int base_addr, int hsf)
319: {
320: cli();
321: outb_control((inb_control(base_addr) & ~HSF_PCB_MASK) | hsf, base_addr);
322: sti();
323: }
324:
325: static int start_receive(struct device *, pcb_struct *);
326:
327: inline static void adapter_reset(struct device *dev)
328: {
329: int timeout;
330: unsigned char orig_hcr = inb_control(dev->base_addr);
331:
332: elp_device *adapter = dev->priv;
333:
334: outb_control(0, dev->base_addr);
335:
336: if (inb_status(dev->base_addr) & ACRF) {
337: do {
338: inb_command(dev->base_addr);
339: timeout = jiffies + 2;
340: while ((jiffies <= timeout) && !(inb_status(dev->base_addr) & ACRF));
341: } while (inb_status(dev->base_addr) & ACRF);
342: set_hsf(dev->base_addr, HSF_PCB_NAK);
343: }
344: outb_control(inb_control(dev->base_addr) | ATTN | DIR, dev->base_addr);
345: timeout = jiffies + 1;
346: while (jiffies <= timeout);
347: outb_control(inb_control(dev->base_addr) & ~ATTN, dev->base_addr);
348: timeout = jiffies + 1;
349: while (jiffies <= timeout);
350: outb_control(inb_control(dev->base_addr) | FLSH, dev->base_addr);
351: timeout = jiffies + 1;
352: while (jiffies <= timeout);
353: outb_control(inb_control(dev->base_addr) & ~FLSH, dev->base_addr);
354: timeout = jiffies + 1;
355: while (jiffies <= timeout);
356:
357: outb_control(orig_hcr, dev->base_addr);
358: if (!start_receive(dev, &adapter->tx_pcb))
359: printk("%s: start receive command failed \n", dev->name);
360: }
361:
362: /* Check to make sure that a DMA transfer hasn't timed out. This should never happen
363: * in theory, but seems to occur occasionally if the card gets prodded at the wrong
364: * time.
365: */
366: static inline void check_dma(struct device *dev)
367: {
368: elp_device *adapter = dev->priv;
369: if (adapter->dmaing && (jiffies > (adapter->current_dma.start_time + 10))) {
370: unsigned long flags;
371: printk("%s: DMA %s timed out, %d bytes left\n", dev->name, adapter->current_dma.direction ? "download" : "upload", get_dma_residue(dev->dma));
372: save_flags(flags);
373: cli();
374: adapter->dmaing = 0;
375: adapter->busy = 0;
376: disable_dma(dev->dma);
377: if (adapter->rx_active)
378: adapter->rx_active--;
379: outb_control(inb_control(dev->base_addr) & ~(DMAE | TCEN | DIR), dev->base_addr);
380: restore_flags(flags);
381: }
382: }
383:
384: /* Primitive functions used by send_pcb() */
385: static inline unsigned int send_pcb_slow(unsigned int base_addr, unsigned char byte)
386: {
387: unsigned int timeout;
388: outb_command(byte, base_addr);
389: for (timeout = jiffies + 5; jiffies < timeout;) {
390: if (inb_status(base_addr) & HCRE)
391: return FALSE;
392: }
393: printk("3c505: send_pcb_slow timed out\n");
394: return TRUE;
395: }
396:
397: static inline unsigned int send_pcb_fast(unsigned int base_addr, unsigned char byte)
398: {
399: unsigned int timeout;
400: outb_command(byte, base_addr);
401: for (timeout = 0; timeout < 40000; timeout++) {
402: if (inb_status(base_addr) & HCRE)
403: return FALSE;
404: }
405: printk("3c505: send_pcb_fast timed out\n");
406: return TRUE;
407: }
408:
409: /* Check to see if the receiver needs restarting, and kick it if so */
410: static inline void prime_rx(struct device *dev)
411: {
412: elp_device *adapter = dev->priv;
413: while (adapter->rx_active < ELP_RX_PCBS && dev->start) {
414: if (!start_receive(dev, &adapter->itx_pcb))
415: break;
416: }
417: }
418:
419: /*****************************************************************
420: *
421: * send_pcb
422: * Send a PCB to the adapter.
423: *
424: * output byte to command reg --<--+
425: * wait until HCRE is non zero |
426: * loop until all bytes sent -->--+
427: * set HSF1 and HSF2 to 1
428: * output pcb length
429: * wait until ASF give ACK or NAK
430: * set HSF1 and HSF2 to 0
431: *
432: *****************************************************************/
433:
434: /* This can be quite slow -- the adapter is allowed to take up to 40ms
435: * to respond to the initial interrupt.
436: *
437: * We run initially with interrupts turned on, but with a semaphore set
438: * so that nobody tries to re-enter this code. Once the first byte has
439: * gone through, we turn interrupts off and then send the others (the
440: * timeout is reduced to 500us).
441: */
442:
443: static int send_pcb(struct device *dev, pcb_struct * pcb)
444: {
445: int i;
446: int timeout;
447: elp_device *adapter = dev->priv;
448:
449: check_dma(dev);
450:
451: if (adapter->dmaing && adapter->current_dma.direction == 0)
452: return FALSE;
453:
454: /* Avoid contention */
455: if (set_bit(1, &adapter->send_pcb_semaphore)) {
456: if (elp_debug >= 3) {
457: printk("%s: send_pcb entered while threaded\n", dev->name);
458: }
459: return FALSE;
460: }
461: /*
462: * load each byte into the command register and
463: * wait for the HCRE bit to indicate the adapter
464: * had read the byte
465: */
466: set_hsf(dev->base_addr, 0);
467:
468: if (send_pcb_slow(dev->base_addr, pcb->command))
469: goto abort;
470:
471: cli();
472:
473: if (send_pcb_fast(dev->base_addr, pcb->length))
474: goto sti_abort;
475:
476: for (i = 0; i < pcb->length; i++) {
477: if (send_pcb_fast(dev->base_addr, pcb->data.raw[i]))
478: goto sti_abort;
479: }
480:
481: outb_control(inb_control(dev->base_addr) | 3, dev->base_addr); /* signal end of PCB */
482: outb_command(2 + pcb->length, dev->base_addr);
483:
484: /* now wait for the acknowledgement */
485: sti();
486:
487: for (timeout = jiffies + 5; jiffies < timeout;) {
488: switch (GET_ASF(dev->base_addr)) {
489: case ASF_PCB_ACK:
490: adapter->send_pcb_semaphore = 0;
491: return TRUE;
492: break;
493: case ASF_PCB_NAK:
494: printk("%s: send_pcb got NAK\n", dev->name);
495: goto abort;
496: break;
497: }
498: }
499:
500: if (elp_debug >= 1)
501: printk("%s: timeout waiting for PCB acknowledge (status %02x)\n", dev->name, inb_status(dev->base_addr));
502:
503: sti_abort:
504: sti();
505: abort:
506: adapter->send_pcb_semaphore = 0;
507: return FALSE;
508: }
509:
510:
511: /*****************************************************************
512: *
513: * receive_pcb
514: * Read a PCB from the adapter
515: *
516: * wait for ACRF to be non-zero ---<---+
517: * input a byte |
518: * if ASF1 and ASF2 were not both one |
519: * before byte was read, loop --->---+
520: * set HSF1 and HSF2 for ack
521: *
522: *****************************************************************/
523:
524: static int receive_pcb(struct device *dev, pcb_struct * pcb)
525: {
526: int i, j;
527: int total_length;
528: int stat;
529: int timeout;
530:
531: elp_device *adapter = dev->priv;
532:
533: set_hsf(dev->base_addr, 0);
534:
535: /* get the command code */
536: timeout = jiffies + 2;
537: while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && jiffies < timeout);
538: if (jiffies >= timeout) {
539: TIMEOUT_MSG(__LINE__);
540: return FALSE;
541: }
542: pcb->command = inb_command(dev->base_addr);
543:
544: /* read the data length */
545: timeout = jiffies + 3;
546: while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && jiffies < timeout);
547: if (jiffies >= timeout) {
548: TIMEOUT_MSG(__LINE__);
549: printk("%s: status %02x\n", dev->name, stat);
550: return FALSE;
551: }
552: pcb->length = inb_command(dev->base_addr);
553:
554: if (pcb->length > MAX_PCB_DATA) {
555: INVALID_PCB_MSG(pcb->length);
556: adapter_reset(dev);
557: return FALSE;
558: }
559: /* read the data */
560: cli();
561: i = 0;
562: do {
563: j = 0;
564: while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000);
565: pcb->data.raw[i++] = inb_command(dev->base_addr);
566: if (i > MAX_PCB_DATA)
567: INVALID_PCB_MSG(i);
568: } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000);
569: sti();
570: if (j >= 20000) {
571: TIMEOUT_MSG(__LINE__);
572: return FALSE;
573: }
574: /* woops, the last "data" byte was really the length! */
575: total_length = pcb->data.raw[--i];
576:
577: /* safety check total length vs data length */
578: if (total_length != (pcb->length + 2)) {
579: if (elp_debug >= 2)
580: printk("%s: mangled PCB received\n", dev->name);
581: set_hsf(dev->base_addr, HSF_PCB_NAK);
582: return FALSE;
583: }
584:
585: if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
586: if (set_bit(0, (void *) &adapter->busy)) {
587: if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
588: set_hsf(dev->base_addr, HSF_PCB_NAK);
589: printk("%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
590: pcb->command = 0;
591: return TRUE;
592: } else {
593: pcb->command = 0xff;
594: }
595: }
596: }
597: set_hsf(dev->base_addr, HSF_PCB_ACK);
598: return TRUE;
599: }
600:
601: /******************************************************
602: *
603: * queue a receive command on the adapter so we will get an
604: * interrupt when a packet is received.
605: *
606: ******************************************************/
607:
608: static int start_receive(struct device *dev, pcb_struct * tx_pcb)
609: {
610: int status;
611: elp_device *adapter = dev->priv;
612:
613: if (elp_debug >= 3)
614: printk("%s: restarting receiver\n", dev->name);
615: tx_pcb->command = CMD_RECEIVE_PACKET;
616: tx_pcb->length = sizeof(struct Rcv_pkt);
617: tx_pcb->data.rcv_pkt.buf_seg
618: = tx_pcb->data.rcv_pkt.buf_ofs = 0; /* Unused */
619: tx_pcb->data.rcv_pkt.buf_len = 1600;
620: tx_pcb->data.rcv_pkt.timeout = 0; /* set timeout to zero */
621: status = send_pcb(dev, tx_pcb);
622: if (status)
623: adapter->rx_active++;
624: return status;
625: }
626:
627: /******************************************************
628: *
629: * extract a packet from the adapter
630: * this routine is only called from within the interrupt
631: * service routine, so no cli/sti calls are needed
632: * note that the length is always assumed to be even
633: *
634: ******************************************************/
635:
636: static void receive_packet(struct device *dev, int len)
637: {
638: int rlen;
639: elp_device *adapter = dev->priv;
640: unsigned long target;
641: struct sk_buff *skb;
642:
643: rlen = (len + 1) & ~1;
644: skb = dev_alloc_skb(rlen + 2);
645:
646: adapter->current_dma.copy_flag = 0;
647:
648: if (!skb) {
649: printk("%s: memory squeeze, dropping packet\n", dev->name);
650: target = virt_to_bus(adapter->dma_buffer);
651: } else {
652: skb_reserve(skb, 2);
653: target = virt_to_bus(skb_put(skb, rlen));
654: if ((target + rlen) >= MAX_DMA_ADDRESS) {
655: target = virt_to_bus(adapter->dma_buffer);
656: adapter->current_dma.copy_flag = 1;
657: }
658: }
659: /* if this happens, we die */
660: if (set_bit(0, (void *) &adapter->dmaing))
661: printk("%s: rx blocked, DMA in progress, dir %d\n", dev->name, adapter->current_dma.direction);
662:
663: adapter->current_dma.direction = 0;
664: adapter->current_dma.length = rlen;
665: adapter->current_dma.skb = skb;
666: adapter->current_dma.start_time = jiffies;
667:
668: outb_control(inb_control(dev->base_addr) | DIR | TCEN | DMAE, dev->base_addr);
669:
670: disable_dma(dev->dma);
671: clear_dma_ff(dev->dma);
672: set_dma_mode(dev->dma, 0x04); /* dma read */
673: set_dma_addr(dev->dma, target);
674: set_dma_count(dev->dma, rlen);
675: enable_dma(dev->dma);
676:
677: if (elp_debug >= 3) {
678: printk("%s: rx DMA transfer started\n", dev->name);
679: }
680: if (adapter->rx_active)
681: adapter->rx_active--;
682:
683: if (!adapter->busy)
684: printk("%s: receive_packet called, busy not set.\n", dev->name);
685: }
686:
687: /******************************************************
688: *
689: * interrupt handler
690: *
691: ******************************************************/
692:
693: static void elp_interrupt(int irq, void *dev_id, struct pt_regs *reg_ptr)
694: {
695: int len;
696: int dlen;
697: int icount = 0;
698: struct device *dev;
699: elp_device *adapter;
700: int timeout;
701:
702: if (irq < 0 || irq > 15) {
703: printk("elp_interrupt(): illegal IRQ number found in interrupt routine (%i)\n", irq);
704: return;
705: }
706: dev = irq2dev_map[irq];
707:
708: if (dev == NULL) {
709: printk("elp_interrupt(): irq %d for unknown device.\n", irq);
710: return;
711: }
712: adapter = (elp_device *) dev->priv;
713:
714: if (dev->interrupt) {
715: printk("%s: re-entering the interrupt handler!\n", dev->name);
716: return;
717: }
718: dev->interrupt = 1;
719:
720: do {
721: /*
722: * has a DMA transfer finished?
723: */
724: if (inb_status(dev->base_addr) & DONE) {
725: if (!adapter->dmaing) {
726: printk("%s: phantom DMA completed\n", dev->name);
727: }
728: if (elp_debug >= 3) {
729: printk("%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
730: }
731:
732: outb_control(inb_control(dev->base_addr) & ~(DMAE | TCEN | DIR), dev->base_addr);
733: if (adapter->current_dma.direction) {
734: dev_kfree_skb(adapter->current_dma.skb, FREE_WRITE);
735: } else {
736: struct sk_buff *skb = adapter->current_dma.skb;
737: if (skb) {
738: skb->dev = dev;
739: if (adapter->current_dma.copy_flag) {
740: memcpy(skb_put(skb, adapter->current_dma.length), adapter->dma_buffer, adapter->current_dma.length);
741: }
742: skb->protocol = eth_type_trans(skb,dev);
743: netif_rx(skb);
744: }
745: }
746: adapter->dmaing = 0;
747: if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
748: int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
749: adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
750: if (elp_debug >= 2)
751: printk("%s: receiving backlogged packet (%d)\n", dev->name, t);
752: receive_packet(dev, t);
753: } else {
754: adapter->busy = 0;
755: }
756: } else {
757: /* has one timed out? */
758: check_dma(dev);
759: }
760:
761: sti();
762:
763: /*
764: * receive a PCB from the adapter
765: */
766: timeout = jiffies + 3;
767: while ((inb_status(dev->base_addr) & ACRF) != 0 && jiffies < timeout) {
768: if (receive_pcb(dev, &adapter->irx_pcb)) {
769: switch (adapter->irx_pcb.command) {
770: case 0:
771: break;
772: /*
773: * received a packet - this must be handled fast
774: */
775: case 0xff:
776: case CMD_RECEIVE_PACKET_COMPLETE:
777: /* if the device isn't open, don't pass packets up the stack */
778: if (dev->start == 0)
779: break;
780: cli();
781: len = adapter->irx_pcb.data.rcv_resp.pkt_len;
782: dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
783: if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
784: printk("%s: interrupt - packet not received correctly\n", dev->name);
785: sti();
786: } else {
787: if (elp_debug >= 3) {
788: sti();
789: printk("%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
790: cli();
791: }
792: if (adapter->irx_pcb.command == 0xff) {
793: if (elp_debug >= 2)
794: printk("%s: adding packet to backlog (len = %d)\n", dev->name, dlen);
795: adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
796: adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
797: } else {
798: receive_packet(dev, dlen);
799: }
800: sti();
801: if (elp_debug >= 3)
802: printk("%s: packet received\n", dev->name);
803: }
804: break;
805:
806: /*
807: * 82586 configured correctly
808: */
809: case CMD_CONFIGURE_82586_RESPONSE:
810: adapter->got[CMD_CONFIGURE_82586] = 1;
811: if (elp_debug >= 3)
812: printk("%s: interrupt - configure response received\n", dev->name);
813: break;
814:
815: /*
816: * Adapter memory configuration
817: */
818: case CMD_CONFIGURE_ADAPTER_RESPONSE:
819: adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
820: if (elp_debug >= 3)
821: printk("%s: Adapter memory configuration %s.\n", dev->name,
822: adapter->irx_pcb.data.failed ? "failed" : "succeeded");
823: break;
824:
825: /*
826: * Multicast list loading
827: */
828: case CMD_LOAD_MULTICAST_RESPONSE:
829: adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
830: if (elp_debug >= 3)
831: printk("%s: Multicast address list loading %s.\n", dev->name,
832: adapter->irx_pcb.data.failed ? "failed" : "succeeded");
833: break;
834:
835: /*
836: * Station address setting
837: */
838: case CMD_SET_ADDRESS_RESPONSE:
839: adapter->got[CMD_SET_STATION_ADDRESS] = 1;
840: if (elp_debug >= 3)
841: printk("%s: Ethernet address setting %s.\n", dev->name,
842: adapter->irx_pcb.data.failed ? "failed" : "succeeded");
843: break;
844:
845:
846: /*
847: * received board statistics
848: */
849: case CMD_NETWORK_STATISTICS_RESPONSE:
850: adapter->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
851: adapter->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
852: adapter->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
853: adapter->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
854: adapter->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
855: adapter->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
856: adapter->got[CMD_NETWORK_STATISTICS] = 1;
857: if (elp_debug >= 3)
858: printk("%s: interrupt - statistics response received\n", dev->name);
859: break;
860:
861: /*
862: * sent a packet
863: */
864: case CMD_TRANSMIT_PACKET_COMPLETE:
865: if (elp_debug >= 3)
866: printk("%s: interrupt - packet sent\n", dev->name);
867: if (dev->start == 0)
868: break;
869: switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
870: case 0xffff:
871: adapter->stats.tx_aborted_errors++;
872: printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name);
873: break;
874: case 0xfffe:
875: adapter->stats.tx_fifo_errors++;
876: printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name);
877: break;
878: }
879: dev->tbusy = 0;
880: mark_bh(NET_BH);
881: break;
882:
883: /*
884: * some unknown PCB
885: */
886: default:
887: printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
888: break;
889: }
890: } else {
891: printk("%s: failed to read PCB on interrupt\n", dev->name);
892: adapter_reset(dev);
893: }
894: }
895:
896: } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
897:
898: prime_rx(dev);
899:
900: /*
901: * indicate no longer in interrupt routine
902: */
903: dev->interrupt = 0;
904: }
905:
906:
907: /******************************************************
908: *
909: * open the board
910: *
911: ******************************************************/
912:
913: static int elp_open(struct device *dev)
914: {
915: elp_device *adapter;
916:
917: adapter = dev->priv;
918:
919: if (elp_debug >= 3)
920: printk("%s: request to open device\n", dev->name);
921:
922: /*
923: * make sure we actually found the device
924: */
925: if (adapter == NULL) {
926: printk("%s: Opening a non-existent physical device\n", dev->name);
927: return -EAGAIN;
928: }
929: /*
930: * disable interrupts on the board
931: */
932: outb_control(0x00, dev->base_addr);
933:
934: /*
935: * clear any pending interrupts
936: */
937: inb_command(dev->base_addr);
938: adapter_reset(dev);
939:
940: /*
941: * interrupt routine not entered
942: */
943: dev->interrupt = 0;
944:
945: /*
946: * transmitter not busy
947: */
948: dev->tbusy = 0;
949:
950: /*
951: * no receive PCBs active
952: */
953: adapter->rx_active = 0;
954:
955: adapter->busy = 0;
956: adapter->send_pcb_semaphore = 0;
957: adapter->rx_backlog.in = 0;
958: adapter->rx_backlog.out = 0;
959:
960: /*
961: * make sure we can find the device header given the interrupt number
962: */
963: irq2dev_map[dev->irq] = dev;
964:
965: /*
966: * install our interrupt service routine
967: */
968: if (request_irq(dev->irq, &elp_interrupt, 0, "3c505", NULL)) {
969: irq2dev_map[dev->irq] = NULL;
970: return -EAGAIN;
971: }
972: if (request_dma(dev->dma, "3c505")) {
973: printk("%s: could not allocate DMA channel\n", dev->name);
974: return -EAGAIN;
975: }
976: adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
977: if (!adapter->dma_buffer) {
978: printk("Could not allocate DMA buffer\n");
979: }
980: adapter->dmaing = 0;
981:
982: /*
983: * enable interrupts on the board
984: */
985: outb_control(CMDE, dev->base_addr);
986:
987: /*
988: * device is now officially open!
989: */
990: dev->start = 1;
991:
992: /*
993: * configure adapter memory: we need 10 multicast addresses, default==0
994: */
995: if (elp_debug >= 3)
996: printk("%s: sending 3c505 memory configuration command\n", dev->name);
997: adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
998: adapter->tx_pcb.data.memconf.cmd_q = 10;
999: adapter->tx_pcb.data.memconf.rcv_q = 20;
1000: adapter->tx_pcb.data.memconf.mcast = 10;
1001: adapter->tx_pcb.data.memconf.frame = 20;
1002: adapter->tx_pcb.data.memconf.rcv_b = 20;
1003: adapter->tx_pcb.data.memconf.progs = 0;
1004: adapter->tx_pcb.length = sizeof(struct Memconf);
1005: adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
1006: if (!send_pcb(dev, &adapter->tx_pcb))
1007: printk("%s: couldn't send memory configuration command\n", dev->name);
1008: else {
1009: int timeout = jiffies + TIMEOUT;
1010: while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && jiffies < timeout);
1011: if (jiffies >= timeout)
1012: TIMEOUT_MSG(__LINE__);
1013: }
1014:
1015:
1016: /*
1017: * configure adapter to receive broadcast messages and wait for response
1018: */
1019: if (elp_debug >= 3)
1020: printk("%s: sending 82586 configure command\n", dev->name);
1021: adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1022: adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1023: adapter->tx_pcb.length = 2;
1024: adapter->got[CMD_CONFIGURE_82586] = 0;
1025: if (!send_pcb(dev, &adapter->tx_pcb))
1026: printk("%s: couldn't send 82586 configure command\n", dev->name);
1027: else {
1028: int timeout = jiffies + TIMEOUT;
1029: while (adapter->got[CMD_CONFIGURE_82586] == 0 && jiffies < timeout);
1030: if (jiffies >= timeout)
1031: TIMEOUT_MSG(__LINE__);
1032: }
1033:
1034: /* enable burst-mode DMA */
1035: outb(0x1, dev->base_addr + PORT_AUXDMA);
1036:
1037: /*
1038: * queue receive commands to provide buffering
1039: */
1040: prime_rx(dev);
1041: if (elp_debug >= 3)
1042: printk("%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
1043:
1044: MOD_INC_USE_COUNT;
1045:
1046: return 0; /* Always succeed */
1047: }
1048:
1049:
1050: /******************************************************
1051: *
1052: * send a packet to the adapter
1053: *
1054: ******************************************************/
1055:
1056: static int send_packet(struct device *dev, struct sk_buff *skb)
1057: {
1058: elp_device *adapter = dev->priv;
1059: unsigned long target;
1060:
1061: /*
1062: * make sure the length is even and no shorter than 60 bytes
1063: */
1064: unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
1065:
1066: if (set_bit(0, (void *) &adapter->busy)) {
1067: if (elp_debug >= 2)
1068: printk("%s: transmit blocked\n", dev->name);
1069: return FALSE;
1070: }
1071: adapter = dev->priv;
1072:
1073: /*
1074: * send the adapter a transmit packet command. Ignore segment and offset
1075: * and make sure the length is even
1076: */
1077: adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
1078: adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
1079: adapter->tx_pcb.data.xmit_pkt.buf_ofs
1080: = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0; /* Unused */
1081: adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;
1082:
1083: if (!send_pcb(dev, &adapter->tx_pcb)) {
1084: adapter->busy = 0;
1085: return FALSE;
1086: }
1087: /* if this happens, we die */
1088: if (set_bit(0, (void *) &adapter->dmaing))
1089: printk("%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
1090:
1091: adapter->current_dma.direction = 1;
1092: adapter->current_dma.start_time = jiffies;
1093:
1094: target = virt_to_bus(skb->data);
1095: if ((target + nlen) >= MAX_DMA_ADDRESS) {
1096: memcpy(adapter->dma_buffer, skb->data, nlen);
1097: target = virt_to_bus(adapter->dma_buffer);
1098: }
1099: adapter->current_dma.skb = skb;
1100: cli();
1101: disable_dma(dev->dma);
1102: clear_dma_ff(dev->dma);
1103: set_dma_mode(dev->dma, 0x08); /* dma memory -> io */
1104: set_dma_addr(dev->dma, target);
1105: set_dma_count(dev->dma, nlen);
1106: enable_dma(dev->dma);
1107: outb_control(inb_control(dev->base_addr) | DMAE | TCEN, dev->base_addr);
1108: if (elp_debug >= 3)
1109: printk("%s: DMA transfer started\n", dev->name);
1110:
1111: return TRUE;
1112: }
1113:
1114: /******************************************************
1115: *
1116: * start the transmitter
1117: * return 0 if sent OK, else return 1
1118: *
1119: ******************************************************/
1120:
1121: static int elp_start_xmit(struct sk_buff *skb, struct device *dev)
1122: {
1123: if (dev->interrupt) {
1124: printk("%s: start_xmit aborted (in irq)\n", dev->name);
1125: return 1;
1126: }
1127:
1128: check_dma(dev);
1129:
1130: /*
1131: * if the transmitter is still busy, we have a transmit timeout...
1132: */
1133: if (dev->tbusy) {
1134: elp_device *adapter = dev->priv;
1135: int tickssofar = jiffies - dev->trans_start;
1136: int stat;
1137:
1138: if (tickssofar < 1000)
1139: return 1;
1140:
1141: stat = inb_status(dev->base_addr);
1142: printk("%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
1143: if (elp_debug >= 1)
1144: printk("%s: status %#02x\n", dev->name, stat);
1145: dev->trans_start = jiffies;
1146: dev->tbusy = 0;
1147: adapter->stats.tx_dropped++;
1148: }
1149:
1150: /* Some upper layer thinks we've missed a tx-done interrupt */
1151: if (skb == NULL) {
1152: dev_tint(dev);
1153: return 0;
1154: }
1155:
1156: if (skb->len <= 0)
1157: return 0;
1158:
1159: if (elp_debug >= 3)
1160: printk("%s: request to send packet of length %d\n", dev->name, (int) skb->len);
1161:
1162: if (set_bit(0, (void *) &dev->tbusy)) {
1163: printk("%s: transmitter access conflict\n", dev->name);
1164: return 1;
1165: }
1166: /*
1167: * send the packet at skb->data for skb->len
1168: */
1169: if (!send_packet(dev, skb)) {
1170: if (elp_debug >= 2) {
1171: printk("%s: failed to transmit packet\n", dev->name);
1172: }
1173: dev->tbusy = 0;
1174: return 1;
1175: }
1176: if (elp_debug >= 3)
1177: printk("%s: packet of length %d sent\n", dev->name, (int) skb->len);
1178:
1179: /*
1180: * start the transmit timeout
1181: */
1182: dev->trans_start = jiffies;
1183:
1184: prime_rx(dev);
1185:
1186: return 0;
1187: }
1188:
1189: /******************************************************
1190: *
1191: * return statistics on the board
1192: *
1193: ******************************************************/
1194:
1195: static struct enet_statistics *elp_get_stats(struct device *dev)
1196: {
1197: elp_device *adapter = (elp_device *) dev->priv;
1198:
1199: if (elp_debug >= 3)
1200: printk("%s: request for stats\n", dev->name);
1201:
1202: /* If the device is closed, just return the latest stats we have,
1203: - we cannot ask from the adapter without interrupts */
1204: if (!dev->start)
1205: return &adapter->stats;
1206:
1207: /* send a get statistics command to the board */
1208: adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
1209: adapter->tx_pcb.length = 0;
1210: adapter->got[CMD_NETWORK_STATISTICS] = 0;
1211: if (!send_pcb(dev, &adapter->tx_pcb))
1212: printk("%s: couldn't send get statistics command\n", dev->name);
1213: else {
1214: int timeout = jiffies + TIMEOUT;
1215: while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && jiffies < timeout);
1216: if (jiffies >= timeout) {
1217: TIMEOUT_MSG(__LINE__);
1218: return &adapter->stats;
1219: }
1220: }
1221:
1222: /* statistics are now up to date */
1223: return &adapter->stats;
1224: }
1225:
1226: /******************************************************
1227: *
1228: * close the board
1229: *
1230: ******************************************************/
1231:
1232: static int elp_close(struct device *dev)
1233: {
1234: elp_device *adapter;
1235:
1236: adapter = dev->priv;
1237:
1238: if (elp_debug >= 3)
1239: printk("%s: request to close device\n", dev->name);
1240:
1241: /* Someone may request the device statistic information even when
1242: * the interface is closed. The following will update the statistics
1243: * structure in the driver, so we'll be able to give current statistics.
1244: */
1245: (void) elp_get_stats(dev);
1246:
1247: /*
1248: * disable interrupts on the board
1249: */
1250: outb_control(0x00, dev->base_addr);
1251:
1252: /*
1253: * flag transmitter as busy (i.e. not available)
1254: */
1255: dev->tbusy = 1;
1256:
1257: /*
1258: * indicate device is closed
1259: */
1260: dev->start = 0;
1261:
1262: /*
1263: * release the IRQ
1264: */
1265: free_irq(dev->irq, NULL);
1266:
1267: /*
1268: * and we no longer have to map irq to dev either
1269: */
1270: irq2dev_map[dev->irq] = 0;
1271:
1272: free_dma(dev->dma);
1273: free_pages((unsigned long) adapter->dma_buffer, __get_order(DMA_BUFFER_SIZE));
1274:
1275: MOD_DEC_USE_COUNT;
1276:
1277: return 0;
1278: }
1279:
1280:
1281: /************************************************************
1282: *
1283: * Set multicast list
1284: * num_addrs==0: clear mc_list
1285: * num_addrs==-1: set promiscuous mode
1286: * num_addrs>0: set mc_list
1287: *
1288: ************************************************************/
1289:
1290: static void elp_set_mc_list(struct device *dev)
1291: {
1292: elp_device *adapter = (elp_device *) dev->priv;
1293: struct dev_mc_list *dmi = dev->mc_list;
1294: int i;
1295:
1296: if (elp_debug >= 3)
1297: printk("%s: request to set multicast list\n", dev->name);
1298:
1299: if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1300: /* send a "load multicast list" command to the board, max 10 addrs/cmd */
1301: /* if num_addrs==0 the list will be cleared */
1302: adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
1303: adapter->tx_pcb.length = 6 * dev->mc_count;
1304: for (i = 0; i < dev->mc_count; i++) {
1305: memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
1306: dmi = dmi->next;
1307: }
1308: adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
1309: if (!send_pcb(dev, &adapter->tx_pcb))
1310: printk("%s: couldn't send set_multicast command\n", dev->name);
1311: else {
1312: int timeout = jiffies + TIMEOUT;
1313: while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && jiffies < timeout);
1314: if (jiffies >= timeout) {
1315: TIMEOUT_MSG(__LINE__);
1316: }
1317: }
1318: if (dev->mc_count)
1319: adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
1320: else /* num_addrs == 0 */
1321: adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1322: } else
1323: adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
1324: /*
1325: * configure adapter to receive messages (as specified above)
1326: * and wait for response
1327: */
1328: if (elp_debug >= 3)
1329: printk("%s: sending 82586 configure command\n", dev->name);
1330: adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1331: adapter->tx_pcb.length = 2;
1332: adapter->got[CMD_CONFIGURE_82586] = 0;
1333: if (!send_pcb(dev, &adapter->tx_pcb))
1334: printk("%s: couldn't send 82586 configure command\n", dev->name);
1335: else {
1336: int timeout = jiffies + TIMEOUT;
1337: while (adapter->got[CMD_CONFIGURE_82586] == 0 && jiffies < timeout);
1338: if (jiffies >= timeout)
1339: TIMEOUT_MSG(__LINE__);
1340: }
1341: }
1342:
1343: /******************************************************
1344: *
1345: * initialise Etherlink Plus board
1346: *
1347: ******************************************************/
1348:
1349: static void elp_init(struct device *dev)
1350: {
1351: elp_device *adapter = dev->priv;
1352:
1353: /*
1354: * set ptrs to various functions
1355: */
1356: dev->open = elp_open; /* local */
1357: dev->stop = elp_close; /* local */
1358: dev->get_stats = elp_get_stats; /* local */
1359: dev->hard_start_xmit = elp_start_xmit; /* local */
1360: dev->set_multicast_list = elp_set_mc_list; /* local */
1361:
1362: /* Setup the generic properties */
1363: ether_setup(dev);
1364:
1365: /*
1366: * setup ptr to adapter specific information
1367: */
1368: memset(&(adapter->stats), 0, sizeof(struct enet_statistics));
1369:
1370: /*
1371: * memory information
1372: */
1373: dev->mem_start = dev->mem_end = dev->rmem_end = dev->rmem_start = 0;
1374: }
1375:
1376: /************************************************************
1377: *
1378: * A couple of tests to see if there's 3C505 or not
1379: * Called only by elp_autodetect
1380: ************************************************************/
1381:
1382: static int elp_sense(struct device *dev)
1383: {
1384: int timeout;
1385: int addr = dev->base_addr;
1386: const char *name = dev->name;
1387: long flags;
1388: byte orig_HCR, orig_HSR;
1389:
1390: if (check_region(addr, 0xf))
1391: return -1;
1392:
1393: orig_HCR = inb_control(addr);
1394: orig_HSR = inb_status(addr);
1395:
1396: if (elp_debug > 0)
1397: printk(search_msg, name, addr);
1398:
1399: if (((orig_HCR == 0xff) && (orig_HSR == 0xff)) ||
1400: ((orig_HCR & DIR) != (orig_HSR & DIR))) {
1401: if (elp_debug > 0)
1402: printk(notfound_msg, 1);
1403: return -1; /* It can't be 3c505 if HCR.DIR != HSR.DIR */
1404: }
1405: /* Enable interrupts - we need timers! */
1406: save_flags(flags);
1407: sti();
1408:
1409: /* Wait for a while; the adapter may still be booting up */
1410: if (elp_debug > 0)
1411: printk(stilllooking_msg);
1412: if (orig_HCR & DIR) {
1413: /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
1414: outb_control(orig_HCR & ~DIR, addr);
1415: timeout = jiffies + 30;
1416: while (jiffies < timeout);
1417: restore_flags(flags);
1418: if (inb_status(addr) & DIR) {
1419: outb_control(orig_HCR, addr);
1420: if (elp_debug > 0)
1421: printk(notfound_msg, 2);
1422: return -1;
1423: }
1424: } else {
1425: /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
1426: outb_control(orig_HCR | DIR, addr);
1427: timeout = jiffies + 30;
1428: while (jiffies < timeout);
1429: restore_flags(flags);
1430: if (!(inb_status(addr) & DIR)) {
1431: outb_control(orig_HCR, addr);
1432: if (elp_debug > 0)
1433: printk(notfound_msg, 3);
1434: return -1;
1435: }
1436: }
1437: /*
1438: * It certainly looks like a 3c505. If it has DMA enabled, it needs
1439: * a hard reset. Also, do a hard reset if selected at the compile time.
1440: */
1441: if (elp_debug > 0)
1442: printk(found_msg);
1443:
1444: return 0;
1445: }
1446:
1447: /*************************************************************
1448: *
1449: * Search through addr_list[] and try to find a 3C505
1450: * Called only by eplus_probe
1451: *************************************************************/
1452:
1453: static int elp_autodetect(struct device *dev)
1454: {
1455: int idx = 0;
1456:
1457: /* if base address set, then only check that address
1458: otherwise, run through the table */
1459: if (dev->base_addr != 0) { /* dev->base_addr == 0 ==> plain autodetect */
1460: if (elp_sense(dev) == 0)
1461: return dev->base_addr;
1462: } else
1463: while ((dev->base_addr = addr_list[idx++])) {
1464: if (elp_sense(dev) == 0)
1465: return dev->base_addr;
1466: }
1467:
1468: /* could not find an adapter */
1469: if (elp_debug > 0)
1470: printk(couldnot_msg, dev->name);
1471:
1472: return 0; /* Because of this, the layer above will return -ENODEV */
1473: }
1474:
1475:
1476: /******************************************************
1477: *
1478: * probe for an Etherlink Plus board at the specified address
1479: *
1480: ******************************************************/
1481:
1482: /* There are three situations we need to be able to detect here:
1483:
1484: * a) the card is idle
1485: * b) the card is still booting up
1486: * c) the card is stuck in a strange state (some DOS drivers do this)
1487: *
1488: * In case (a), all is well. In case (b), we wait 10 seconds to see if the
1489: * card finishes booting, and carry on if so. In case (c), we do a hard reset,
1490: * loop round, and hope for the best.
1491: *
1492: * This is all very unpleasant, but hopefully avoids the problems with the old
1493: * probe code (which had a 15-second delay if the card was idle, and didn't
1494: * work at all if it was in a weird state).
1495: */
1496:
1497: int elplus_probe(struct device *dev)
1498: {
1499: elp_device *adapter;
1500: int i, tries, tries1, timeout, okay;
1501:
1502: /*
1503: * setup adapter structure
1504: */
1505:
1506: dev->base_addr = elp_autodetect(dev);
1507: if (!(dev->base_addr))
1508: return -ENODEV;
1509:
1510: /*
1511: * setup ptr to adapter specific information
1512: */
1513: adapter = (elp_device *) (dev->priv = kmalloc(sizeof(elp_device), GFP_KERNEL));
1514: if (adapter == NULL) {
1515: printk("%s: out of memory\n", dev->name);
1516: return -ENODEV;
1517: }
1518:
1519: for (tries1 = 0; tries1 < 3; tries1++) {
1520: outb_control((inb_control(dev->base_addr) | CMDE) & ~DIR, dev->base_addr);
1521: /* First try to write just one byte, to see if the card is
1522: * responding at all normally.
1523: */
1524: timeout = jiffies + 5;
1525: okay = 0;
1526: while (jiffies < timeout && !(inb_status(dev->base_addr) & HCRE));
1527: if ((inb_status(dev->base_addr) & HCRE)) {
1528: outb_command(0, dev->base_addr); /* send a spurious byte */
1529: timeout = jiffies + 5;
1530: while (jiffies < timeout && !(inb_status(dev->base_addr) & HCRE));
1531: if (inb_status(dev->base_addr) & HCRE)
1532: okay = 1;
1533: }
1534: if (!okay) {
1535: /* Nope, it's ignoring the command register. This means that
1536: * either it's still booting up, or it's died.
1537: */
1538: printk("%s: command register wouldn't drain, ", dev->name);
1539: if ((inb_status(dev->base_addr) & 7) == 3) {
1540: /* If the adapter status is 3, it *could* still be booting.
1541: * Give it the benefit of the doubt for 10 seconds.
1542: */
1543: printk("assuming 3c505 still starting\n");
1544: timeout = jiffies + 10 * HZ;
1545: while (jiffies < timeout && (inb_status(dev->base_addr) & 7));
1546: if (inb_status(dev->base_addr) & 7) {
1547: printk("%s: 3c505 failed to start\n", dev->name);
1548: } else {
1549: okay = 1; /* It started */
1550: }
1551: } else {
1552: /* Otherwise, it must just be in a strange state. We probably
1553: * need to kick it.
1554: */
1555: printk("3c505 is sulking\n");
1556: }
1557: }
1558: for (tries = 0; tries < 5 && okay; tries++) {
1559:
1560: /*
1561: * Try to set the Ethernet address, to make sure that the board
1562: * is working.
1563: */
1564: adapter->tx_pcb.command = CMD_STATION_ADDRESS;
1565: adapter->tx_pcb.length = 0;
1566: autoirq_setup(0);
1567: if (!send_pcb(dev, &adapter->tx_pcb)) {
1568: printk("%s: could not send first PCB\n", dev->name);
1569: autoirq_report(0);
1570: continue;
1571: }
1572: if (!receive_pcb(dev, &adapter->rx_pcb)) {
1573: printk("%s: could not read first PCB\n", dev->name);
1574: autoirq_report(0);
1575: continue;
1576: }
1577: if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
1578: (adapter->rx_pcb.length != 6)) {
1579: printk("%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
1580: autoirq_report(0);
1581: continue;
1582: }
1583: goto okay;
1584: }
1585: /* It's broken. Do a hard reset to re-initialise the board,
1586: * and try again.
1587: */
1588: printk(KERN_INFO "%s: resetting adapter\n", dev->name);
1589: outb_control(inb_control(dev->base_addr) | FLSH | ATTN, dev->base_addr);
1590: outb_control(inb_control(dev->base_addr) & ~(FLSH | ATTN), dev->base_addr);
1591: }
1592: printk("%s: failed to initialise 3c505\n", dev->name);
1593: return -ENODEV;
1594:
1595: okay:
1596: if (dev->irq) { /* Is there a preset IRQ? */
1597: int rpt = autoirq_report(0);
1598: if (dev->irq != rpt) {
1599: printk("%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
1600: return -ENODEV;
1601: }
1602: /* if dev->irq == autoirq_report(0), all is well */
1603: } else /* No preset IRQ; just use what we can detect */
1604: dev->irq = autoirq_report(0);
1605: switch (dev->irq) { /* Legal, sane? */
1606: case 0:
1607: printk("%s: No IRQ reported by autoirq_report().\n", dev->name);
1608: printk("%s: Check the jumpers of your 3c505 board.\n", dev->name);
1609: return -ENODEV;
1610: case 1:
1611: case 6:
1612: case 8:
1613: case 13:
1614: printk("%s: Impossible IRQ %d reported by autoirq_report().\n",
1615: dev->name, dev->irq);
1616: return -ENODEV;
1617: }
1618: /*
1619: * Now we have the IRQ number so we can disable the interrupts from
1620: * the board until the board is opened.
1621: */
1622: outb_control(inb_control(dev->base_addr) & ~CMDE, dev->base_addr);
1623:
1624: /*
1625: * copy ethernet address into structure
1626: */
1627: for (i = 0; i < 6; i++)
1628: dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
1629:
1630: /* set up the DMA channel */
1631: dev->dma = ELP_DMA;
1632:
1633: /*
1634: * print remainder of startup message
1635: */
1636: printk("%s: 3c505 at %#lx, irq %d, dma %d, ",
1637: dev->name, dev->base_addr, dev->irq, dev->dma);
1638: printk("addr %02x:%02x:%02x:%02x:%02x:%02x, ",
1639: dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1640: dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1641:
1642: /*
1643: * read more information from the adapter
1644: */
1645:
1646: adapter->tx_pcb.command = CMD_ADAPTER_INFO;
1647: adapter->tx_pcb.length = 0;
1648: if (!send_pcb(dev, &adapter->tx_pcb) ||
1649: !receive_pcb(dev, &adapter->rx_pcb) ||
1650: (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
1651: (adapter->rx_pcb.length != 10)) {
1652: printk("%s: not responding to second PCB\n", dev->name);
1653: }
1654: 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);
1655:
1656: /*
1657: * reconfigure the adapter memory to better suit our purposes
1658: */
1659: adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
1660: adapter->tx_pcb.length = 12;
1661: adapter->tx_pcb.data.memconf.cmd_q = 8;
1662: adapter->tx_pcb.data.memconf.rcv_q = 8;
1663: adapter->tx_pcb.data.memconf.mcast = 10;
1664: adapter->tx_pcb.data.memconf.frame = 10;
1665: adapter->tx_pcb.data.memconf.rcv_b = 10;
1666: adapter->tx_pcb.data.memconf.progs = 0;
1667: if (!send_pcb(dev, &adapter->tx_pcb) ||
1668: !receive_pcb(dev, &adapter->rx_pcb) ||
1669: (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
1670: (adapter->rx_pcb.length != 2)) {
1671: printk("%s: could not configure adapter memory\n", dev->name);
1672: }
1673: if (adapter->rx_pcb.data.configure) {
1674: printk("%s: adapter configuration failed\n", dev->name);
1675: }
1676: /*
1677: * and reserve the address region
1678: */
1679: request_region(dev->base_addr, ELP_IO_EXTENT, "3c505");
1680:
1681: /*
1682: * initialise the device
1683: */
1684: elp_init(dev);
1685:
1686: return 0;
1687: }
1688:
1689: #ifdef MODULE
1690: static char devicename[9] = {0,};
1691: static struct device dev_3c505 =
1692: {
1693: devicename, /* device name is inserted by linux/drivers/net/net_init.c */
1694: 0, 0, 0, 0,
1695: 0, 0,
1696: 0, 0, 0, NULL, elplus_probe};
1697:
1698: int io = 0x300;
1699: int irq = 0;
1700:
1701: int init_module(void)
1702: {
1703: if (io == 0)
1704: printk("3c505: You should not use auto-probing with insmod!\n");
1705: dev_3c505.base_addr = io;
1706: dev_3c505.irq = irq;
1707: if (register_netdev(&dev_3c505) != 0) {
1708: return -EIO;
1709: }
1710: return 0;
1711: }
1712:
1713: void cleanup_module(void)
1714: {
1715: unregister_netdev(&dev_3c505);
1716: kfree(dev_3c505.priv);
1717: dev_3c505.priv = NULL;
1718:
1719: /* If we don't do this, we can't re-insmod it later. */
1720: release_region(dev_3c505.base_addr, ELP_IO_EXTENT);
1721: }
1722:
1723: #endif /* MODULE */
1724:
1725:
1726: /*
1727: * Local Variables:
1728: * c-file-style: "linux"
1729: * tab-width: 8
1730: * compile-command: "gcc -D__KERNEL__ -I/discs/bibble/src/linux-1.3.69/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strength-reduce -pipe -m486 -DCPU=486 -DMODULE -c 3c505.c"
1731: * End:
1732: */
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