File: /usr/src/linux-2.4.7/drivers/net/8390.c

1     /* 8390.c: A general NS8390 ethernet driver core for linux. */
2     /*
3     	Written 1992-94 by Donald Becker.
4       
5     	Copyright 1993 United States Government as represented by the
6     	Director, National Security Agency.
7     
8     	This software may be used and distributed according to the terms
9     	of the GNU General Public License, incorporated herein by reference.
10     
11     	The author may be reached as becker@scyld.com, or C/O
12     	Scyld Computing Corporation
13     	410 Severn Ave., Suite 210
14     	Annapolis MD 21403
15     
16       
17       This is the chip-specific code for many 8390-based ethernet adaptors.
18       This is not a complete driver, it must be combined with board-specific
19       code such as ne.c, wd.c, 3c503.c, etc.
20     
21       Seeing how at least eight drivers use this code, (not counting the
22       PCMCIA ones either) it is easy to break some card by what seems like
23       a simple innocent change. Please contact me or Donald if you think
24       you have found something that needs changing. -- PG
25     
26     
27       Changelog:
28     
29       Paul Gortmaker	: remove set_bit lock, other cleanups.
30       Paul Gortmaker	: add ei_get_8390_hdr() so we can pass skb's to 
31     			  ei_block_input() for eth_io_copy_and_sum().
32       Paul Gortmaker	: exchange static int ei_pingpong for a #define,
33     			  also add better Tx error handling.
34       Paul Gortmaker	: rewrite Rx overrun handling as per NS specs.
35       Alexey Kuznetsov	: use the 8390's six bit hash multicast filter.
36       Paul Gortmaker	: tweak ANK's above multicast changes a bit.
37       Paul Gortmaker	: update packet statistics for v2.1.x
38       Alan Cox		: support arbitary stupid port mappings on the
39       			  68K Macintosh. Support >16bit I/O spaces
40       Paul Gortmaker	: add kmod support for auto-loading of the 8390
41     			  module by all drivers that require it.
42       Alan Cox		: Spinlocking work, added 'BUG_83C690'
43       Paul Gortmaker	: Separate out Tx timeout code from Tx path.
44     
45       Sources:
46       The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
47     
48       */
49     
50     static const char version[] =
51         "8390.c:v1.10cvs 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
52     
53     #include <linux/module.h>
54     #include <linux/kernel.h>
55     #include <linux/sched.h>
56     #include <linux/fs.h>
57     #include <linux/types.h>
58     #include <linux/ptrace.h>
59     #include <linux/string.h>
60     #include <asm/system.h>
61     #include <asm/uaccess.h>
62     #include <asm/bitops.h>
63     #include <asm/io.h>
64     #include <asm/irq.h>
65     #include <linux/delay.h>
66     #include <linux/errno.h>
67     #include <linux/fcntl.h>
68     #include <linux/in.h>
69     #include <linux/interrupt.h>
70     #include <linux/init.h>
71     
72     #include <linux/netdevice.h>
73     #include <linux/etherdevice.h>
74     
75     #define NS8390_CORE
76     #include "8390.h"
77     
78     #define BUG_83C690
79     
80     /* These are the operational function interfaces to board-specific
81        routines.
82     	void reset_8390(struct net_device *dev)
83     		Resets the board associated with DEV, including a hardware reset of
84     		the 8390.  This is only called when there is a transmit timeout, and
85     		it is always followed by 8390_init().
86     	void block_output(struct net_device *dev, int count, const unsigned char *buf,
87     					  int start_page)
88     		Write the COUNT bytes of BUF to the packet buffer at START_PAGE.  The
89     		"page" value uses the 8390's 256-byte pages.
90     	void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page)
91     		Read the 4 byte, page aligned 8390 header. *If* there is a
92     		subsequent read, it will be of the rest of the packet.
93     	void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
94     		Read COUNT bytes from the packet buffer into the skb data area. Start 
95     		reading from RING_OFFSET, the address as the 8390 sees it.  This will always
96     		follow the read of the 8390 header. 
97     */
98     #define ei_reset_8390 (ei_local->reset_8390)
99     #define ei_block_output (ei_local->block_output)
100     #define ei_block_input (ei_local->block_input)
101     #define ei_get_8390_hdr (ei_local->get_8390_hdr)
102     
103     /* use 0 for production, 1 for verification, >2 for debug */
104     #ifndef ei_debug
105     int ei_debug = 1;
106     #endif
107     
108     /* Index to functions. */
109     static void ei_tx_intr(struct net_device *dev);
110     static void ei_tx_err(struct net_device *dev);
111     static void ei_tx_timeout(struct net_device *dev);
112     static void ei_receive(struct net_device *dev);
113     static void ei_rx_overrun(struct net_device *dev);
114     
115     /* Routines generic to NS8390-based boards. */
116     static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
117     								int start_page);
118     static void set_multicast_list(struct net_device *dev);
119     static void do_set_multicast_list(struct net_device *dev);
120     
121     /*
122      *	SMP and the 8390 setup.
123      *
124      *	The 8390 isnt exactly designed to be multithreaded on RX/TX. There is
125      *	a page register that controls bank and packet buffer access. We guard
126      *	this with ei_local->page_lock. Nobody should assume or set the page other
127      *	than zero when the lock is not held. Lock holders must restore page 0
128      *	before unlocking. Even pure readers must take the lock to protect in 
129      *	page 0.
130      *
131      *	To make life difficult the chip can also be very slow. We therefore can't
132      *	just use spinlocks. For the longer lockups we disable the irq the device
133      *	sits on and hold the lock. We must hold the lock because there is a dual
134      *	processor case other than interrupts (get stats/set multicast list in
135      *	parallel with each other and transmit).
136      *
137      *	Note: in theory we can just disable the irq on the card _but_ there is
138      *	a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
139      *	enter lock, take the queued irq. So we waddle instead of flying.
140      *
141      *	Finally by special arrangement for the purpose of being generally 
142      *	annoying the transmit function is called bh atomic. That places
143      *	restrictions on the user context callers as disable_irq won't save
144      *	them.
145      */
146      
147     
148     
149     /**
150      * ei_open - Open/initialize the board.
151      * @dev: network device to initialize
152      *
153      * This routine goes all-out, setting everything
154      * up anew at each open, even though many of these registers should only
155      * need to be set once at boot.
156      */
157     int ei_open(struct net_device *dev)
158     {
159     	unsigned long flags;
160     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
161     
162     	/* This can't happen unless somebody forgot to call ethdev_init(). */
163     	if (ei_local == NULL) 
164     	{
165     		printk(KERN_EMERG "%s: ei_open passed a non-existent device!\n", dev->name);
166     		return -ENXIO;
167     	}
168     	
169     	/* The card I/O part of the driver (e.g. 3c503) can hook a Tx timeout
170     	    wrapper that does e.g. media check & then calls ei_tx_timeout. */
171     	if (dev->tx_timeout == NULL)
172     		 dev->tx_timeout = ei_tx_timeout;
173     	if (dev->watchdog_timeo <= 0)
174     		 dev->watchdog_timeo = TX_TIMEOUT;
175         
176     	/*
177     	 *	Grab the page lock so we own the register set, then call
178     	 *	the init function.
179     	 */
180           
181           	spin_lock_irqsave(&ei_local->page_lock, flags);
182     	NS8390_init(dev, 1);
183     	/* Set the flag before we drop the lock, That way the IRQ arrives
184     	   after its set and we get no silly warnings */
185     	netif_start_queue(dev);
186           	spin_unlock_irqrestore(&ei_local->page_lock, flags);
187     	ei_local->irqlock = 0;
188     	return 0;
189     }
190     
191     /**
192      * ei_close - shut down network device
193      * @dev: network device to close
194      *
195      * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
196      */
197     int ei_close(struct net_device *dev)
198     {
199     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
200     	unsigned long flags;
201     
202     	/*
203     	 *	Hold the page lock during close
204     	 */
205     	 	
206           	spin_lock_irqsave(&ei_local->page_lock, flags);
207     	NS8390_init(dev, 0);
208           	spin_unlock_irqrestore(&ei_local->page_lock, flags);
209     	netif_stop_queue(dev);
210     	return 0;
211     }
212     
213     /**
214      * ei_tx_timeout - handle transmit time out condition
215      * @dev: network device which has apparently fallen asleep
216      *
217      * Called by kernel when device never acknowledges a transmit has
218      * completed (or failed) - i.e. never posted a Tx related interrupt.
219      */
220     
221     void ei_tx_timeout(struct net_device *dev)
222     {
223     	long e8390_base = dev->base_addr;
224     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
225     	int txsr, isr, tickssofar = jiffies - dev->trans_start;
226     	unsigned long flags;
227     
228     	ei_local->stat.tx_errors++;
229     
230     	spin_lock_irqsave(&ei_local->page_lock, flags);
231     	txsr = inb(e8390_base+EN0_TSR);
232     	isr = inb(e8390_base+EN0_ISR);
233     	spin_unlock_irqrestore(&ei_local->page_lock, flags);
234     
235     	printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
236     		dev->name, (txsr & ENTSR_ABT) ? "excess collisions." :
237     		(isr) ? "lost interrupt?" : "cable problem?", txsr, isr, tickssofar);
238     
239     	if (!isr && !ei_local->stat.tx_packets) 
240     	{
241     		/* The 8390 probably hasn't gotten on the cable yet. */
242     		ei_local->interface_num ^= 1;   /* Try a different xcvr.  */
243     	}
244     
245     	/* Ugly but a reset can be slow, yet must be protected */
246     		
247     	disable_irq_nosync(dev->irq);
248     	spin_lock(&ei_local->page_lock);
249     		
250     	/* Try to restart the card.  Perhaps the user has fixed something. */
251     	ei_reset_8390(dev);
252     	NS8390_init(dev, 1);
253     		
254     	spin_unlock(&ei_local->page_lock);
255     	enable_irq(dev->irq);
256     	netif_wake_queue(dev);
257     }
258         
259     /**
260      * ei_start_xmit - begin packet transmission
261      * @skb: packet to be sent
262      * @dev: network device to which packet is sent
263      *
264      * Sends a packet to an 8390 network device.
265      */
266      
267     static int ei_start_xmit(struct sk_buff *skb, struct net_device *dev)
268     {
269     	long e8390_base = dev->base_addr;
270     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
271     	int length, send_length, output_page;
272     	unsigned long flags;
273     
274     	length = skb->len;
275     
276     	/* Mask interrupts from the ethercard. 
277     	   SMP: We have to grab the lock here otherwise the IRQ handler
278     	   on another CPU can flip window and race the IRQ mask set. We end
279     	   up trashing the mcast filter not disabling irqs if we dont lock */
280     	   
281     	spin_lock_irqsave(&ei_local->page_lock, flags);
282     	outb_p(0x00, e8390_base + EN0_IMR);
283     	spin_unlock_irqrestore(&ei_local->page_lock, flags);
284     	
285     	
286     	/*
287     	 *	Slow phase with lock held.
288     	 */
289     	 
290     	disable_irq_nosync(dev->irq);
291     	
292     	spin_lock(&ei_local->page_lock);
293     	
294     	ei_local->irqlock = 1;
295     
296     	send_length = ETH_ZLEN < length ? length : ETH_ZLEN;
297         
298     #ifdef EI_PINGPONG
299     
300     	/*
301     	 * We have two Tx slots available for use. Find the first free
302     	 * slot, and then perform some sanity checks. With two Tx bufs,
303     	 * you get very close to transmitting back-to-back packets. With
304     	 * only one Tx buf, the transmitter sits idle while you reload the
305     	 * card, leaving a substantial gap between each transmitted packet.
306     	 */
307     
308     	if (ei_local->tx1 == 0) 
309     	{
310     		output_page = ei_local->tx_start_page;
311     		ei_local->tx1 = send_length;
312     		if (ei_debug  &&  ei_local->tx2 > 0)
313     			printk(KERN_DEBUG "%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
314     				dev->name, ei_local->tx2, ei_local->lasttx, ei_local->txing);
315     	}
316     	else if (ei_local->tx2 == 0) 
317     	{
318     		output_page = ei_local->tx_start_page + TX_1X_PAGES;
319     		ei_local->tx2 = send_length;
320     		if (ei_debug  &&  ei_local->tx1 > 0)
321     			printk(KERN_DEBUG "%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
322     				dev->name, ei_local->tx1, ei_local->lasttx, ei_local->txing);
323     	}
324     	else
325     	{	/* We should never get here. */
326     		if (ei_debug)
327     			printk(KERN_DEBUG "%s: No Tx buffers free! tx1=%d tx2=%d last=%d\n",
328     				dev->name, ei_local->tx1, ei_local->tx2, ei_local->lasttx);
329     		ei_local->irqlock = 0;
330     		netif_stop_queue(dev);
331     		outb_p(ENISR_ALL, e8390_base + EN0_IMR);
332     		spin_unlock(&ei_local->page_lock);
333     		enable_irq(dev->irq);
334     		ei_local->stat.tx_errors++;
335     		return 1;
336     	}
337     
338     	/*
339     	 * Okay, now upload the packet and trigger a send if the transmitter
340     	 * isn't already sending. If it is busy, the interrupt handler will
341     	 * trigger the send later, upon receiving a Tx done interrupt.
342     	 */
343     
344     	ei_block_output(dev, length, skb->data, output_page);
345     	if (! ei_local->txing) 
346     	{
347     		ei_local->txing = 1;
348     		NS8390_trigger_send(dev, send_length, output_page);
349     		dev->trans_start = jiffies;
350     		if (output_page == ei_local->tx_start_page) 
351     		{
352     			ei_local->tx1 = -1;
353     			ei_local->lasttx = -1;
354     		}
355     		else 
356     		{
357     			ei_local->tx2 = -1;
358     			ei_local->lasttx = -2;
359     		}
360     	}
361     	else ei_local->txqueue++;
362     
363     	if (ei_local->tx1  &&  ei_local->tx2)
364     		netif_stop_queue(dev);
365     	else
366     		netif_start_queue(dev);
367     
368     #else	/* EI_PINGPONG */
369     
370     	/*
371     	 * Only one Tx buffer in use. You need two Tx bufs to come close to
372     	 * back-to-back transmits. Expect a 20 -> 25% performance hit on
373     	 * reasonable hardware if you only use one Tx buffer.
374     	 */
375     
376     	ei_block_output(dev, length, skb->data, ei_local->tx_start_page);
377     	ei_local->txing = 1;
378     	NS8390_trigger_send(dev, send_length, ei_local->tx_start_page);
379     	dev->trans_start = jiffies;
380     	netif_stop_queue(dev);
381     
382     #endif	/* EI_PINGPONG */
383     
384     	/* Turn 8390 interrupts back on. */
385     	ei_local->irqlock = 0;
386     	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
387     	
388     	spin_unlock(&ei_local->page_lock);
389     	enable_irq(dev->irq);
390     
391     	dev_kfree_skb (skb);
392     	ei_local->stat.tx_bytes += send_length;
393         
394     	return 0;
395     }
396     
397     /**
398      * ei_interrupt - handle the interrupts from an 8390
399      * @irq: interrupt number
400      * @dev_id: a pointer to the net_device
401      * @regs: unused
402      *
403      * Handle the ether interface interrupts. We pull packets from
404      * the 8390 via the card specific functions and fire them at the networking
405      * stack. We also handle transmit completions and wake the transmit path if
406      * neccessary. We also update the counters and do other housekeeping as
407      * needed.
408      */
409     
410     void ei_interrupt(int irq, void *dev_id, struct pt_regs * regs)
411     {
412     	struct net_device *dev = dev_id;
413     	long e8390_base;
414     	int interrupts, nr_serviced = 0;
415     	struct ei_device *ei_local;
416         
417     	if (dev == NULL) 
418     	{
419     		printk ("net_interrupt(): irq %d for unknown device.\n", irq);
420     		return;
421     	}
422         
423     	e8390_base = dev->base_addr;
424     	ei_local = (struct ei_device *) dev->priv;
425     
426     	/*
427     	 *	Protect the irq test too.
428     	 */
429     	 
430     	spin_lock(&ei_local->page_lock);
431     
432     	if (ei_local->irqlock) 
433     	{
434     #if 1 /* This might just be an interrupt for a PCI device sharing this line */
435     		/* The "irqlock" check is only for testing. */
436     		printk(ei_local->irqlock
437     			   ? "%s: Interrupted while interrupts are masked! isr=%#2x imr=%#2x.\n"
438     			   : "%s: Reentering the interrupt handler! isr=%#2x imr=%#2x.\n",
439     			   dev->name, inb_p(e8390_base + EN0_ISR),
440     			   inb_p(e8390_base + EN0_IMR));
441     #endif
442     		spin_unlock(&ei_local->page_lock);
443     		return;
444     	}
445         
446     	/* Change to page 0 and read the intr status reg. */
447     	outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
448     	if (ei_debug > 3)
449     		printk(KERN_DEBUG "%s: interrupt(isr=%#2.2x).\n", dev->name,
450     			   inb_p(e8390_base + EN0_ISR));
451         
452     	/* !!Assumption!! -- we stay in page 0.	 Don't break this. */
453     	while ((interrupts = inb_p(e8390_base + EN0_ISR)) != 0
454     		   && ++nr_serviced < MAX_SERVICE) 
455     	{
456     		if (!netif_running(dev)) {
457     			printk(KERN_WARNING "%s: interrupt from stopped card\n", dev->name);
458     			/* rmk - acknowledge the interrupts */
459     			outb_p(interrupts, e8390_base + EN0_ISR);
460     			interrupts = 0;
461     			break;
462     		}
463     		if (interrupts & ENISR_OVER) 
464     			ei_rx_overrun(dev);
465     		else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) 
466     		{
467     			/* Got a good (?) packet. */
468     			ei_receive(dev);
469     		}
470     		/* Push the next to-transmit packet through. */
471     		if (interrupts & ENISR_TX)
472     			ei_tx_intr(dev);
473     		else if (interrupts & ENISR_TX_ERR)
474     			ei_tx_err(dev);
475     
476     		if (interrupts & ENISR_COUNTERS) 
477     		{
478     			ei_local->stat.rx_frame_errors += inb_p(e8390_base + EN0_COUNTER0);
479     			ei_local->stat.rx_crc_errors   += inb_p(e8390_base + EN0_COUNTER1);
480     			ei_local->stat.rx_missed_errors+= inb_p(e8390_base + EN0_COUNTER2);
481     			outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
482     		}
483     		
484     		/* Ignore any RDC interrupts that make it back to here. */
485     		if (interrupts & ENISR_RDC) 
486     		{
487     			outb_p(ENISR_RDC, e8390_base + EN0_ISR);
488     		}
489     
490     		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
491     	}
492         
493     	if (interrupts && ei_debug) 
494     	{
495     		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
496     		if (nr_serviced >= MAX_SERVICE) 
497     		{
498     			/* 0xFF is valid for a card removal */
499     			if(interrupts!=0xFF)
500     				printk(KERN_WARNING "%s: Too much work at interrupt, status %#2.2x\n",
501     				   dev->name, interrupts);
502     			outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
503     		} else {
504     			printk(KERN_WARNING "%s: unknown interrupt %#2x\n", dev->name, interrupts);
505     			outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
506     		}
507     	}
508     	spin_unlock(&ei_local->page_lock);
509     	return;
510     }
511     
512     /**
513      * ei_tx_err - handle transmitter error
514      * @dev: network device which threw the exception
515      *
516      * A transmitter error has happened. Most likely excess collisions (which
517      * is a fairly normal condition). If the error is one where the Tx will
518      * have been aborted, we try and send another one right away, instead of
519      * letting the failed packet sit and collect dust in the Tx buffer. This
520      * is a much better solution as it avoids kernel based Tx timeouts, and
521      * an unnecessary card reset.
522      *
523      * Called with lock held.
524      */
525     
526     static void ei_tx_err(struct net_device *dev)
527     {
528     	long e8390_base = dev->base_addr;
529     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
530     	unsigned char txsr = inb_p(e8390_base+EN0_TSR);
531     	unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
532     
533     #ifdef VERBOSE_ERROR_DUMP
534     	printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
535     	if (txsr & ENTSR_ABT)
536     		printk("excess-collisions ");
537     	if (txsr & ENTSR_ND)
538     		printk("non-deferral ");
539     	if (txsr & ENTSR_CRS)
540     		printk("lost-carrier ");
541     	if (txsr & ENTSR_FU)
542     		printk("FIFO-underrun ");
543     	if (txsr & ENTSR_CDH)
544     		printk("lost-heartbeat ");
545     	printk("\n");
546     #endif
547     
548     	outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
549     
550     	if (tx_was_aborted)
551     		ei_tx_intr(dev);
552     	else 
553     	{
554     		ei_local->stat.tx_errors++;
555     		if (txsr & ENTSR_CRS) ei_local->stat.tx_carrier_errors++;
556     		if (txsr & ENTSR_CDH) ei_local->stat.tx_heartbeat_errors++;
557     		if (txsr & ENTSR_OWC) ei_local->stat.tx_window_errors++;
558     	}
559     }
560     
561     /**
562      * ei_tx_intr - transmit interrupt handler
563      * @dev: network device for which tx intr is handled
564      *
565      * We have finished a transmit: check for errors and then trigger the next
566      * packet to be sent. Called with lock held.
567      */
568     
569     static void ei_tx_intr(struct net_device *dev)
570     {
571     	long e8390_base = dev->base_addr;
572     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
573     	int status = inb(e8390_base + EN0_TSR);
574         
575     	outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
576     
577     #ifdef EI_PINGPONG
578     
579     	/*
580     	 * There are two Tx buffers, see which one finished, and trigger
581     	 * the send of another one if it exists.
582     	 */
583     	ei_local->txqueue--;
584     
585     	if (ei_local->tx1 < 0) 
586     	{
587     		if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
588     			printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
589     				ei_local->name, ei_local->lasttx, ei_local->tx1);
590     		ei_local->tx1 = 0;
591     		if (ei_local->tx2 > 0) 
592     		{
593     			ei_local->txing = 1;
594     			NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
595     			dev->trans_start = jiffies;
596     			ei_local->tx2 = -1,
597     			ei_local->lasttx = 2;
598     		}
599     		else ei_local->lasttx = 20, ei_local->txing = 0;	
600     	}
601     	else if (ei_local->tx2 < 0) 
602     	{
603     		if (ei_local->lasttx != 2  &&  ei_local->lasttx != -2)
604     			printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
605     				ei_local->name, ei_local->lasttx, ei_local->tx2);
606     		ei_local->tx2 = 0;
607     		if (ei_local->tx1 > 0) 
608     		{
609     			ei_local->txing = 1;
610     			NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
611     			dev->trans_start = jiffies;
612     			ei_local->tx1 = -1;
613     			ei_local->lasttx = 1;
614     		}
615     		else
616     			ei_local->lasttx = 10, ei_local->txing = 0;
617     	}
618     //	else printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
619     //			dev->name, ei_local->lasttx);
620     
621     #else	/* EI_PINGPONG */
622     	/*
623     	 *  Single Tx buffer: mark it free so another packet can be loaded.
624     	 */
625     	ei_local->txing = 0;
626     #endif
627     
628     	/* Minimize Tx latency: update the statistics after we restart TXing. */
629     	if (status & ENTSR_COL)
630     		ei_local->stat.collisions++;
631     	if (status & ENTSR_PTX)
632     		ei_local->stat.tx_packets++;
633     	else 
634     	{
635     		ei_local->stat.tx_errors++;
636     		if (status & ENTSR_ABT) 
637     		{
638     			ei_local->stat.tx_aborted_errors++;
639     			ei_local->stat.collisions += 16;
640     		}
641     		if (status & ENTSR_CRS) 
642     			ei_local->stat.tx_carrier_errors++;
643     		if (status & ENTSR_FU) 
644     			ei_local->stat.tx_fifo_errors++;
645     		if (status & ENTSR_CDH)
646     			ei_local->stat.tx_heartbeat_errors++;
647     		if (status & ENTSR_OWC)
648     			ei_local->stat.tx_window_errors++;
649     	}
650     	netif_wake_queue(dev);
651     }
652     
653     /**
654      * ei_receive - receive some packets
655      * @dev: network device with which receive will be run
656      *
657      * We have a good packet(s), get it/them out of the buffers. 
658      * Called with lock held.
659      */
660     
661     static void ei_receive(struct net_device *dev)
662     {
663     	long e8390_base = dev->base_addr;
664     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
665     	unsigned char rxing_page, this_frame, next_frame;
666     	unsigned short current_offset;
667     	int rx_pkt_count = 0;
668     	struct e8390_pkt_hdr rx_frame;
669     	int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
670         
671     	while (++rx_pkt_count < 10) 
672     	{
673     		int pkt_len, pkt_stat;
674     		
675     		/* Get the rx page (incoming packet pointer). */
676     		outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
677     		rxing_page = inb_p(e8390_base + EN1_CURPAG);
678     		outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
679     		
680     		/* Remove one frame from the ring.  Boundary is always a page behind. */
681     		this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1;
682     		if (this_frame >= ei_local->stop_page)
683     			this_frame = ei_local->rx_start_page;
684     		
685     		/* Someday we'll omit the previous, iff we never get this message.
686     		   (There is at least one clone claimed to have a problem.)  
687     		   
688     		   Keep quiet if it looks like a card removal. One problem here
689     		   is that some clones crash in roughly the same way.
690     		 */
691     		if (ei_debug > 0  &&  this_frame != ei_local->current_page && (this_frame!=0x0 || rxing_page!=0xFF))
692     			printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
693     				   dev->name, this_frame, ei_local->current_page);
694     		
695     		if (this_frame == rxing_page)	/* Read all the frames? */
696     			break;				/* Done for now */
697     		
698     		current_offset = this_frame << 8;
699     		ei_get_8390_hdr(dev, &rx_frame, this_frame);
700     		
701     		pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
702     		pkt_stat = rx_frame.status;
703     		
704     		next_frame = this_frame + 1 + ((pkt_len+4)>>8);
705     		
706     		/* Check for bogosity warned by 3c503 book: the status byte is never
707     		   written.  This happened a lot during testing! This code should be
708     		   cleaned up someday. */
709     		if (rx_frame.next != next_frame
710     			&& rx_frame.next != next_frame + 1
711     			&& rx_frame.next != next_frame - num_rx_pages
712     			&& rx_frame.next != next_frame + 1 - num_rx_pages) {
713     			ei_local->current_page = rxing_page;
714     			outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
715     			ei_local->stat.rx_errors++;
716     			continue;
717     		}
718     
719     		if (pkt_len < 60  ||  pkt_len > 1518) 
720     		{
721     			if (ei_debug)
722     				printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
723     					   dev->name, rx_frame.count, rx_frame.status,
724     					   rx_frame.next);
725     			ei_local->stat.rx_errors++;
726     			ei_local->stat.rx_length_errors++;
727     		}
728     		 else if ((pkt_stat & 0x0F) == ENRSR_RXOK) 
729     		{
730     			struct sk_buff *skb;
731     			
732     			skb = dev_alloc_skb(pkt_len+2);
733     			if (skb == NULL) 
734     			{
735     				if (ei_debug > 1)
736     					printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
737     						   dev->name, pkt_len);
738     				ei_local->stat.rx_dropped++;
739     				break;
740     			}
741     			else
742     			{
743     				skb_reserve(skb,2);	/* IP headers on 16 byte boundaries */
744     				skb->dev = dev;
745     				skb_put(skb, pkt_len);	/* Make room */
746     				ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
747     				skb->protocol=eth_type_trans(skb,dev);
748     				netif_rx(skb);
749     				dev->last_rx = jiffies;
750     				ei_local->stat.rx_packets++;
751     				ei_local->stat.rx_bytes += pkt_len;
752     				if (pkt_stat & ENRSR_PHY)
753     					ei_local->stat.multicast++;
754     			}
755     		} 
756     		else 
757     		{
758     			if (ei_debug)
759     				printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
760     					   dev->name, rx_frame.status, rx_frame.next,
761     					   rx_frame.count);
762     			ei_local->stat.rx_errors++;
763     			/* NB: The NIC counts CRC, frame and missed errors. */
764     			if (pkt_stat & ENRSR_FO)
765     				ei_local->stat.rx_fifo_errors++;
766     		}
767     		next_frame = rx_frame.next;
768     		
769     		/* This _should_ never happen: it's here for avoiding bad clones. */
770     		if (next_frame >= ei_local->stop_page) {
771     			printk("%s: next frame inconsistency, %#2x\n", dev->name,
772     				   next_frame);
773     			next_frame = ei_local->rx_start_page;
774     		}
775     		ei_local->current_page = next_frame;
776     		outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
777     	}
778     
779     	/* We used to also ack ENISR_OVER here, but that would sometimes mask
780     	   a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
781     	outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
782     	return;
783     }
784     
785     /**
786      * ei_rx_overrun - handle receiver overrun
787      * @dev: network device which threw exception
788      *
789      * We have a receiver overrun: we have to kick the 8390 to get it started
790      * again. Problem is that you have to kick it exactly as NS prescribes in
791      * the updated datasheets, or "the NIC may act in an unpredictable manner."
792      * This includes causing "the NIC to defer indefinitely when it is stopped
793      * on a busy network."  Ugh.
794      * Called with lock held. Don't call this with the interrupts off or your
795      * computer will hate you - it takes 10ms or so. 
796      */
797     
798     static void ei_rx_overrun(struct net_device *dev)
799     {
800     	long e8390_base = dev->base_addr;
801     	unsigned char was_txing, must_resend = 0;
802     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
803         
804     	/*
805     	 * Record whether a Tx was in progress and then issue the
806     	 * stop command.
807     	 */
808     	was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
809     	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
810         
811     	if (ei_debug > 1)
812     		printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
813     	ei_local->stat.rx_over_errors++;
814         
815     	/* 
816     	 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
817     	 * Early datasheets said to poll the reset bit, but now they say that
818     	 * it "is not a reliable indicator and subsequently should be ignored."
819     	 * We wait at least 10ms.
820     	 */
821     
822     	udelay(10*1000);
823     
824     	/*
825     	 * Reset RBCR[01] back to zero as per magic incantation.
826     	 */
827     	outb_p(0x00, e8390_base+EN0_RCNTLO);
828     	outb_p(0x00, e8390_base+EN0_RCNTHI);
829     
830     	/*
831     	 * See if any Tx was interrupted or not. According to NS, this
832     	 * step is vital, and skipping it will cause no end of havoc.
833     	 */
834     
835     	if (was_txing)
836     	{ 
837     		unsigned char tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
838     		if (!tx_completed)
839     			must_resend = 1;
840     	}
841     
842     	/*
843     	 * Have to enter loopback mode and then restart the NIC before
844     	 * you are allowed to slurp packets up off the ring.
845     	 */
846     	outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
847     	outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
848     
849     	/*
850     	 * Clear the Rx ring of all the debris, and ack the interrupt.
851     	 */
852     	ei_receive(dev);
853     	outb_p(ENISR_OVER, e8390_base+EN0_ISR);
854     
855     	/*
856     	 * Leave loopback mode, and resend any packet that got stopped.
857     	 */
858     	outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); 
859     	if (must_resend)
860         		outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
861     }
862     
863     /*
864      *	Collect the stats. This is called unlocked and from several contexts.
865      */
866      
867     static struct net_device_stats *get_stats(struct net_device *dev)
868     {
869     	long ioaddr = dev->base_addr;
870     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
871     	unsigned long flags;
872         
873     	/* If the card is stopped, just return the present stats. */
874     	if (!netif_running(dev))
875     		return &ei_local->stat;
876     
877     	spin_lock_irqsave(&ei_local->page_lock,flags);
878     	/* Read the counter registers, assuming we are in page 0. */
879     	ei_local->stat.rx_frame_errors += inb_p(ioaddr + EN0_COUNTER0);
880     	ei_local->stat.rx_crc_errors   += inb_p(ioaddr + EN0_COUNTER1);
881     	ei_local->stat.rx_missed_errors+= inb_p(ioaddr + EN0_COUNTER2);
882     	spin_unlock_irqrestore(&ei_local->page_lock, flags);
883         
884     	return &ei_local->stat;
885     }
886     
887     /*
888      * Update the given Autodin II CRC value with another data byte.
889      */
890     
891     static inline u32 update_crc(u8 byte, u32 current_crc)
892     {
893     	int bit;
894     	u8 ah = 0;
895     	for (bit=0; bit<8; bit++) 
896     	{
897     		u8 carry = (current_crc>>31);
898     		current_crc <<= 1;
899     		ah = ((ah<<1) | carry) ^ byte;
900     		if (ah&1)
901     			current_crc ^= 0x04C11DB7;	/* CRC polynomial */
902     		ah >>= 1;
903     		byte >>= 1;
904     	}
905     	return current_crc;
906     }
907     
908     /*
909      * Form the 64 bit 8390 multicast table from the linked list of addresses
910      * associated with this dev structure.
911      */
912      
913     static inline void make_mc_bits(u8 *bits, struct net_device *dev)
914     {
915     	struct dev_mc_list *dmi;
916     
917     	for (dmi=dev->mc_list; dmi; dmi=dmi->next) 
918     	{
919     		int i;
920     		u32 crc;
921     		if (dmi->dmi_addrlen != ETH_ALEN) 
922     		{
923     			printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
924     			continue;
925     		}
926     		crc = 0xffffffff;	/* initial CRC value */
927     		for (i=0; i<ETH_ALEN; i++)
928     			crc = update_crc(dmi->dmi_addr[i], crc);
929     		/* 
930     		 * The 8390 uses the 6 most significant bits of the
931     		 * CRC to index the multicast table.
932     		 */
933     		bits[crc>>29] |= (1<<((crc>>26)&7));
934     	}
935     }
936     
937     /**
938      * do_set_multicast_list - set/clear multicast filter
939      * @dev: net device for which multicast filter is adjusted
940      *
941      *	Set or clear the multicast filter for this adaptor. May be called
942      *	from a BH in 2.1.x. Must be called with lock held. 
943      */
944      
945     static void do_set_multicast_list(struct net_device *dev)
946     {
947     	long e8390_base = dev->base_addr;
948     	int i;
949     	struct ei_device *ei_local = (struct ei_device*)dev->priv;
950     
951     	if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) 
952     	{
953     		memset(ei_local->mcfilter, 0, 8);
954     		if (dev->mc_list)
955     			make_mc_bits(ei_local->mcfilter, dev);
956     	}
957     	else
958     		memset(ei_local->mcfilter, 0xFF, 8);	/* mcast set to accept-all */
959     
960     	/* 
961     	 * DP8390 manuals don't specify any magic sequence for altering
962     	 * the multicast regs on an already running card. To be safe, we
963     	 * ensure multicast mode is off prior to loading up the new hash
964     	 * table. If this proves to be not enough, we can always resort
965     	 * to stopping the NIC, loading the table and then restarting.
966     	 *
967     	 * Bug Alert!  The MC regs on the SMC 83C690 (SMC Elite and SMC 
968     	 * Elite16) appear to be write-only. The NS 8390 data sheet lists
969     	 * them as r/w so this is a bug.  The SMC 83C790 (SMC Ultra and
970     	 * Ultra32 EISA) appears to have this bug fixed.
971     	 */
972     	 
973     	if (netif_running(dev))
974     		outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
975     	outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
976     	for(i = 0; i < 8; i++) 
977     	{
978     		outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
979     #ifndef BUG_83C690
980     		if(inb_p(e8390_base + EN1_MULT_SHIFT(i))!=ei_local->mcfilter[i])
981     			printk(KERN_ERR "Multicast filter read/write mismap %d\n",i);
982     #endif
983     	}
984     	outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
985     
986       	if(dev->flags&IFF_PROMISC)
987       		outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
988     	else if(dev->flags&IFF_ALLMULTI || dev->mc_list)
989       		outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
990       	else
991       		outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
992      }
993     
994     /*
995      *	Called without lock held. This is invoked from user context and may
996      *	be parallel to just about everything else. Its also fairly quick and
997      *	not called too often. Must protect against both bh and irq users
998      */
999      
1000     static void set_multicast_list(struct net_device *dev)
1001     {
1002     	unsigned long flags;
1003     	struct ei_device *ei_local = (struct ei_device*)dev->priv;
1004     	
1005     	spin_lock_irqsave(&ei_local->page_lock, flags);
1006     	do_set_multicast_list(dev);
1007     	spin_unlock_irqrestore(&ei_local->page_lock, flags);
1008     }	
1009     
1010     /**
1011      * ethdev_init - init rest of 8390 device struct
1012      * @dev: network device structure to init
1013      *
1014      * Initialize the rest of the 8390 device structure.  Do NOT __init
1015      * this, as it is used by 8390 based modular drivers too.
1016      */
1017     
1018     int ethdev_init(struct net_device *dev)
1019     {
1020     	if (ei_debug > 1)
1021     		printk(version);
1022         
1023     	if (dev->priv == NULL) 
1024     	{
1025     		struct ei_device *ei_local;
1026     		
1027     		dev->priv = kmalloc(sizeof(struct ei_device), GFP_KERNEL);
1028     		if (dev->priv == NULL)
1029     			return -ENOMEM;
1030     		memset(dev->priv, 0, sizeof(struct ei_device));
1031     		ei_local = (struct ei_device *)dev->priv;
1032     		spin_lock_init(&ei_local->page_lock);
1033     	}
1034         
1035     	dev->hard_start_xmit = &ei_start_xmit;
1036     	dev->get_stats	= get_stats;
1037     	dev->set_multicast_list = &set_multicast_list;
1038     
1039     	ether_setup(dev);
1040             
1041     	return 0;
1042     }
1043     
1044     
1045     
1046     /* This page of functions should be 8390 generic */
1047     /* Follow National Semi's recommendations for initializing the "NIC". */
1048     
1049     /**
1050      * NS8390_init - initialize 8390 hardware
1051      * @dev: network device to initialize
1052      * @startp: boolean.  non-zero value to initiate chip processing
1053      *
1054      *	Must be called with lock held.
1055      */
1056     
1057     void NS8390_init(struct net_device *dev, int startp)
1058     {
1059     	long e8390_base = dev->base_addr;
1060     	struct ei_device *ei_local = (struct ei_device *) dev->priv;
1061     	int i;
1062     	int endcfg = ei_local->word16
1063     	    ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
1064     	    : 0x48;
1065         
1066     	if(sizeof(struct e8390_pkt_hdr)!=4)
1067         		panic("8390.c: header struct mispacked\n");    
1068     	/* Follow National Semi's recommendations for initing the DP83902. */
1069     	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1070     	outb_p(endcfg, e8390_base + EN0_DCFG);	/* 0x48 or 0x49 */
1071     	/* Clear the remote byte count registers. */
1072     	outb_p(0x00,  e8390_base + EN0_RCNTLO);
1073     	outb_p(0x00,  e8390_base + EN0_RCNTHI);
1074     	/* Set to monitor and loopback mode -- this is vital!. */
1075     	outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
1076     	outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1077     	/* Set the transmit page and receive ring. */
1078     	outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1079     	ei_local->tx1 = ei_local->tx2 = 0;
1080     	outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1081     	outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY);	/* 3c503 says 0x3f,NS0x26*/
1082     	ei_local->current_page = ei_local->rx_start_page;		/* assert boundary+1 */
1083     	outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1084     	/* Clear the pending interrupts and mask. */
1085     	outb_p(0xFF, e8390_base + EN0_ISR);
1086     	outb_p(0x00,  e8390_base + EN0_IMR);
1087         
1088     	/* Copy the station address into the DS8390 registers. */
1089     
1090     	outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1091     	for(i = 0; i < 6; i++) 
1092     	{
1093     		outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1094     		if(inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1095     			printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
1096     	}
1097     
1098     	outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1099     	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1100     
1101     	netif_start_queue(dev);
1102     	ei_local->tx1 = ei_local->tx2 = 0;
1103     	ei_local->txing = 0;
1104     
1105     	if (startp) 
1106     	{
1107     		outb_p(0xff,  e8390_base + EN0_ISR);
1108     		outb_p(ENISR_ALL,  e8390_base + EN0_IMR);
1109     		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1110     		outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
1111     		/* 3c503 TechMan says rxconfig only after the NIC is started. */
1112     		outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on,  */
1113     		do_set_multicast_list(dev);	/* (re)load the mcast table */
1114     	}
1115     }
1116     
1117     /* Trigger a transmit start, assuming the length is valid. 
1118        Always called with the page lock held */
1119        
1120     static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1121     								int start_page)
1122     {
1123     	long e8390_base = dev->base_addr;
1124      	struct ei_device *ei_local __attribute((unused)) = (struct ei_device *) dev->priv;
1125        
1126     	outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
1127         
1128     	if (inb_p(e8390_base) & E8390_TRANS) 
1129     	{
1130     		printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
1131     			dev->name);
1132     		return;
1133     	}
1134     	outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1135     	outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1136     	outb_p(start_page, e8390_base + EN0_TPSR);
1137     	outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1138     }
1139     
1140     EXPORT_SYMBOL(ei_open);
1141     EXPORT_SYMBOL(ei_close);
1142     EXPORT_SYMBOL(ei_interrupt);
1143     EXPORT_SYMBOL(ei_tx_timeout);
1144     EXPORT_SYMBOL(ethdev_init);
1145     EXPORT_SYMBOL(NS8390_init);
1146     
1147     #if defined(MODULE)
1148     
1149     int init_module(void)
1150     {
1151     	return 0;
1152     }
1153     
1154     void cleanup_module(void)
1155     {
1156     }
1157     
1158     #endif /* MODULE */
1159     
1160     /*
1161      * Local variables:
1162      *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c 8390.c"
1163      *  version-control: t
1164      *  kept-new-versions: 5
1165      *  c-indent-level: 4
1166      *  tab-width: 4
1167      * End:
1168      */
1169