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Root/drivers/net/lib8390.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	Paul Gortmaker : Remove old unused single Tx buffer code.
45	Hayato Fujiwara : Add m32r support.
46	Paul Gortmaker : use skb_padto() instead of stack scratch area
47
48	Sources:
49	The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
50
51	*/
52
53	#include <linux/module.h>
54	#include <linux/kernel.h>
55	#include <linux/jiffies.h>
56	#include <linux/fs.h>
57	#include <linux/types.h>
58	#include <linux/string.h>
59	#include <linux/bitops.h>
60	#include <asm/system.h>
61	#include <asm/uaccess.h>
62	#include <asm/io.h>
63	#include <asm/irq.h>
64	#include <linux/delay.h>
65	#include <linux/errno.h>
66	#include <linux/fcntl.h>
67	#include <linux/in.h>
68	#include <linux/interrupt.h>
69	#include <linux/init.h>
70	#include <linux/crc32.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	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 do_set_multicast_list(struct net_device *dev);
119	static void __NS8390_init(struct net_device *dev, int startp);
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	* Additional explanation of problems with locking by Alan Cox:
147	*
148	* "The author (me) didn't use spin_lock_irqsave because the slowness of the
149	* card means that approach caused horrible problems like losing serial data
150	* at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA
151	* chips with FPGA front ends.
152	*
153	* Ok the logic behind the 8390 is very simple:
154	*
155	* Things to know
156	* - IRQ delivery is asynchronous to the PCI bus
157	* - Blocking the local CPU IRQ via spin locks was too slow
158	* - The chip has register windows needing locking work
159	*
160	* So the path was once (I say once as people appear to have changed it
161	* in the mean time and it now looks rather bogus if the changes to use
162	* disable_irq_nosync_irqsave are disabling the local IRQ)
163	*
164	*
165	* Take the page lock
166	* Mask the IRQ on chip
167	* Disable the IRQ (but not mask locally- someone seems to have
168	* broken this with the lock validator stuff)
169	* [This must be _nosync as the page lock may otherwise
170	* deadlock us]
171	* Drop the page lock and turn IRQs back on
172	*
173	* At this point an existing IRQ may still be running but we can't
174	* get a new one
175	*
176	* Take the lock (so we know the IRQ has terminated) but don't mask
177	* the IRQs on the processor
178	* Set irqlock [for debug]
179	*
180	* Transmit (slow as ****)
181	*
182	* re-enable the IRQ
183	*
184	*
185	* We have to use disable_irq because otherwise you will get delayed
186	* interrupts on the APIC bus deadlocking the transmit path.
187	*
188	* Quite hairy but the chip simply wasn't designed for SMP and you can't
189	* even ACK an interrupt without risking corrupting other parallel
190	* activities on the chip." [lkml, 25 Jul 2007]
191	*/
192
193
194
195	/**
196	* ei_open - Open/initialize the board.
197	* @dev: network device to initialize
198	*
199	* This routine goes all-out, setting everything
200	* up anew at each open, even though many of these registers should only
201	* need to be set once at boot.
202	*/
203	static int __ei_open(struct net_device *dev)
204	{
205	unsigned long flags;
206	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
207
208	if (dev->watchdog_timeo <= 0)
209	dev->watchdog_timeo = TX_TIMEOUT;
210
211	/*
212	* Grab the page lock so we own the register set, then call
213	* the init function.
214	*/
215
216	spin_lock_irqsave(&ei_local->page_lock, flags);
217	__NS8390_init(dev, 1);
218	/* Set the flag before we drop the lock, That way the IRQ arrives
219	after its set and we get no silly warnings */
220	netif_start_queue(dev);
221	spin_unlock_irqrestore(&ei_local->page_lock, flags);
222	ei_local->irqlock = 0;
223	return 0;
224	}
225
226	/**
227	* ei_close - shut down network device
228	* @dev: network device to close
229	*
230	* Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
231	*/
232	static int __ei_close(struct net_device *dev)
233	{
234	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
235	unsigned long flags;
236
237	/*
238	* Hold the page lock during close
239	*/
240
241	spin_lock_irqsave(&ei_local->page_lock, flags);
242	__NS8390_init(dev, 0);
243	spin_unlock_irqrestore(&ei_local->page_lock, flags);
244	netif_stop_queue(dev);
245	return 0;
246	}
247
248	/**
249	* ei_tx_timeout - handle transmit time out condition
250	* @dev: network device which has apparently fallen asleep
251	*
252	* Called by kernel when device never acknowledges a transmit has
253	* completed (or failed) - i.e. never posted a Tx related interrupt.
254	*/
255
256	static void __ei_tx_timeout(struct net_device *dev)
257	{
258	unsigned long e8390_base = dev->base_addr;
259	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
260	int txsr, isr, tickssofar = jiffies - dev->trans_start;
261	unsigned long flags;
262
263	dev->stats.tx_errors++;
264
265	spin_lock_irqsave(&ei_local->page_lock, flags);
266	txsr = ei_inb(e8390_base+EN0_TSR);
267	isr = ei_inb(e8390_base+EN0_ISR);
268	spin_unlock_irqrestore(&ei_local->page_lock, flags);
269
270	printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
271	dev->name, (txsr & ENTSR_ABT) ? "excess collisions." :
272	(isr) ? "lost interrupt?" : "cable problem?", txsr, isr, tickssofar);
273
274	if (!isr && !dev->stats.tx_packets)
275	{
276	/* The 8390 probably hasn't gotten on the cable yet. */
277	ei_local->interface_num ^= 1; /* Try a different xcvr. */
278	}
279
280	/* Ugly but a reset can be slow, yet must be protected */
281
282	disable_irq_nosync_lockdep(dev->irq);
283	spin_lock(&ei_local->page_lock);
284
285	/* Try to restart the card. Perhaps the user has fixed something. */
286	ei_reset_8390(dev);
287	__NS8390_init(dev, 1);
288
289	spin_unlock(&ei_local->page_lock);
290	enable_irq_lockdep(dev->irq);
291	netif_wake_queue(dev);
292	}
293
294	/**
295	* ei_start_xmit - begin packet transmission
296	* @skb: packet to be sent
297	* @dev: network device to which packet is sent
298	*
299	* Sends a packet to an 8390 network device.
300	*/
301
302	static int __ei_start_xmit(struct sk_buff skb, struct net_device dev)
303	{
304	unsigned long e8390_base = dev->base_addr;
305	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
306	int send_length = skb->len, output_page;
307	unsigned long flags;
308	char buf[ETH_ZLEN];
309	char *data = skb->data;
310
311	if (skb->len < ETH_ZLEN) {
312	memset(buf, 0, ETH_ZLEN); /* more efficient than doing just the needed bits */
313	memcpy(buf, data, skb->len);
314	send_length = ETH_ZLEN;
315	data = buf;
316	}
317
318	/* Mask interrupts from the ethercard.
319	SMP: We have to grab the lock here otherwise the IRQ handler
320	on another CPU can flip window and race the IRQ mask set. We end
321	up trashing the mcast filter not disabling irqs if we don't lock */
322
323	spin_lock_irqsave(&ei_local->page_lock, flags);
324	ei_outb_p(0x00, e8390_base + EN0_IMR);
325	spin_unlock_irqrestore(&ei_local->page_lock, flags);
326
327
328	/*
329	* Slow phase with lock held.
330	*/
331
332	disable_irq_nosync_lockdep_irqsave(dev->irq, &flags);
333
334	spin_lock(&ei_local->page_lock);
335
336	ei_local->irqlock = 1;
337
338	/*
339	* We have two Tx slots available for use. Find the first free
340	* slot, and then perform some sanity checks. With two Tx bufs,
341	* you get very close to transmitting back-to-back packets. With
342	* only one Tx buf, the transmitter sits idle while you reload the
343	* card, leaving a substantial gap between each transmitted packet.
344	*/
345
346	if (ei_local->tx1 == 0)
347	{
348	output_page = ei_local->tx_start_page;
349	ei_local->tx1 = send_length;
350	if (ei_debug && ei_local->tx2 > 0)
351	printk(KERN_DEBUG "%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
352	dev->name, ei_local->tx2, ei_local->lasttx, ei_local->txing);
353	}
354	else if (ei_local->tx2 == 0)
355	{
356	output_page = ei_local->tx_start_page + TX_PAGES/2;
357	ei_local->tx2 = send_length;
358	if (ei_debug && ei_local->tx1 > 0)
359	printk(KERN_DEBUG "%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
360	dev->name, ei_local->tx1, ei_local->lasttx, ei_local->txing);
361	}
362	else
363	{ /* We should never get here. */
364	if (ei_debug)
365	printk(KERN_DEBUG "%s: No Tx buffers free! tx1=%d tx2=%d last=%d\n",
366	dev->name, ei_local->tx1, ei_local->tx2, ei_local->lasttx);
367	ei_local->irqlock = 0;
368	netif_stop_queue(dev);
369	ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
370	spin_unlock(&ei_local->page_lock);
371	enable_irq_lockdep_irqrestore(dev->irq, &flags);
372	dev->stats.tx_errors++;
373	return NETDEV_TX_BUSY;
374	}
375
376	/*
377	* Okay, now upload the packet and trigger a send if the transmitter
378	* isn't already sending. If it is busy, the interrupt handler will
379	* trigger the send later, upon receiving a Tx done interrupt.
380	*/
381
382	ei_block_output(dev, send_length, data, output_page);
383
384	if (! ei_local->txing)
385	{
386	ei_local->txing = 1;
387	NS8390_trigger_send(dev, send_length, output_page);
388	dev->trans_start = jiffies;
389	if (output_page == ei_local->tx_start_page)
390	{
391	ei_local->tx1 = -1;
392	ei_local->lasttx = -1;
393	}
394	else
395	{
396	ei_local->tx2 = -1;
397	ei_local->lasttx = -2;
398	}
399	}
400	else ei_local->txqueue++;
401
402	if (ei_local->tx1 && ei_local->tx2)
403	netif_stop_queue(dev);
404	else
405	netif_start_queue(dev);
406
407	/* Turn 8390 interrupts back on. */
408	ei_local->irqlock = 0;
409	ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
410
411	spin_unlock(&ei_local->page_lock);
412	enable_irq_lockdep_irqrestore(dev->irq, &flags);
413
414	dev_kfree_skb (skb);
415	dev->stats.tx_bytes += send_length;
416
417	return 0;
418	}
419
420	/**
421	* ei_interrupt - handle the interrupts from an 8390
422	* @irq: interrupt number
423	* @dev_id: a pointer to the net_device
424	*
425	* Handle the ether interface interrupts. We pull packets from
426	* the 8390 via the card specific functions and fire them at the networking
427	* stack. We also handle transmit completions and wake the transmit path if
428	* necessary. We also update the counters and do other housekeeping as
429	* needed.
430	*/
431
432	static irqreturn_t __ei_interrupt(int irq, void *dev_id)
433	{
434	struct net_device *dev = dev_id;
435	unsigned long e8390_base = dev->base_addr;
436	int interrupts, nr_serviced = 0;
437	struct ei_device *ei_local = netdev_priv(dev);
438
439	/*
440	* Protect the irq test too.
441	*/
442
443	spin_lock(&ei_local->page_lock);
444
445	if (ei_local->irqlock)
446	{
447	#if 1 /* This might just be an interrupt for a PCI device sharing this line */
448	/* The "irqlock" check is only for testing. */
449	printk(ei_local->irqlock
450	? "%s: Interrupted while interrupts are masked! isr=%#2x imr=%#2x.\n"
451	: "%s: Reentering the interrupt handler! isr=%#2x imr=%#2x.\n",
452	dev->name, ei_inb_p(e8390_base + EN0_ISR),
453	ei_inb_p(e8390_base + EN0_IMR));
454	#endif
455	spin_unlock(&ei_local->page_lock);
456	return IRQ_NONE;
457	}
458
459	/* Change to page 0 and read the intr status reg. */
460	ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
461	if (ei_debug > 3)
462	printk(KERN_DEBUG "%s: interrupt(isr=%#2.2x).\n", dev->name,
463	ei_inb_p(e8390_base + EN0_ISR));
464
465	/* !!Assumption!! -- we stay in page 0. Don't break this. */
466	while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0
467	&& ++nr_serviced < MAX_SERVICE)
468	{
469	if (!netif_running(dev)) {
470	printk(KERN_WARNING "%s: interrupt from stopped card\n", dev->name);
471	/* rmk - acknowledge the interrupts */
472	ei_outb_p(interrupts, e8390_base + EN0_ISR);
473	interrupts = 0;
474	break;
475	}
476	if (interrupts & ENISR_OVER)
477	ei_rx_overrun(dev);
478	else if (interrupts & (ENISR_RX+ENISR_RX_ERR))
479	{
480	/* Got a good (?) packet. */
481	ei_receive(dev);
482	}
483	/* Push the next to-transmit packet through. */
484	if (interrupts & ENISR_TX)
485	ei_tx_intr(dev);
486	else if (interrupts & ENISR_TX_ERR)
487	ei_tx_err(dev);
488
489	if (interrupts & ENISR_COUNTERS)
490	{
491	dev->stats.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0);
492	dev->stats.rx_crc_errors += ei_inb_p(e8390_base + EN0_COUNTER1);
493	dev->stats.rx_missed_errors+= ei_inb_p(e8390_base + EN0_COUNTER2);
494	ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
495	}
496
497	/* Ignore any RDC interrupts that make it back to here. */
498	if (interrupts & ENISR_RDC)
499	{
500	ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR);
501	}
502
503	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
504	}
505
506	if (interrupts && ei_debug)
507	{
508	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
509	if (nr_serviced >= MAX_SERVICE)
510	{
511	/* 0xFF is valid for a card removal */
512	if(interrupts!=0xFF)
513	printk(KERN_WARNING "%s: Too much work at interrupt, status %#2.2x\n",
514	dev->name, interrupts);
515	ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
516	} else {
517	printk(KERN_WARNING "%s: unknown interrupt %#2x\n", dev->name, interrupts);
518	ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
519	}
520	}
521	spin_unlock(&ei_local->page_lock);
522	return IRQ_RETVAL(nr_serviced > 0);
523	}
524
525	#ifdef CONFIG_NET_POLL_CONTROLLER
526	static void __ei_poll(struct net_device *dev)
527	{
528	disable_irq(dev->irq);
529	__ei_interrupt(dev->irq, dev);
530	enable_irq(dev->irq);
531	}
532	#endif
533
534	/**
535	* ei_tx_err - handle transmitter error
536	* @dev: network device which threw the exception
537	*
538	* A transmitter error has happened. Most likely excess collisions (which
539	* is a fairly normal condition). If the error is one where the Tx will
540	* have been aborted, we try and send another one right away, instead of
541	* letting the failed packet sit and collect dust in the Tx buffer. This
542	* is a much better solution as it avoids kernel based Tx timeouts, and
543	* an unnecessary card reset.
544	*
545	* Called with lock held.
546	*/
547
548	static void ei_tx_err(struct net_device *dev)
549	{
550	unsigned long e8390_base = dev->base_addr;
551	/* ei_local is used on some platforms via the EI_SHIFT macro */
552	struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
553	unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR);
554	unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
555
556	#ifdef VERBOSE_ERROR_DUMP
557	printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
558	if (txsr & ENTSR_ABT)
559	printk("excess-collisions ");
560	if (txsr & ENTSR_ND)
561	printk("non-deferral ");
562	if (txsr & ENTSR_CRS)
563	printk("lost-carrier ");
564	if (txsr & ENTSR_FU)
565	printk("FIFO-underrun ");
566	if (txsr & ENTSR_CDH)
567	printk("lost-heartbeat ");
568	printk("\n");
569	#endif
570
571	ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
572
573	if (tx_was_aborted)
574	ei_tx_intr(dev);
575	else
576	{
577	dev->stats.tx_errors++;
578	if (txsr & ENTSR_CRS) dev->stats.tx_carrier_errors++;
579	if (txsr & ENTSR_CDH) dev->stats.tx_heartbeat_errors++;
580	if (txsr & ENTSR_OWC) dev->stats.tx_window_errors++;
581	}
582	}
583
584	/**
585	* ei_tx_intr - transmit interrupt handler
586	* @dev: network device for which tx intr is handled
587	*
588	* We have finished a transmit: check for errors and then trigger the next
589	* packet to be sent. Called with lock held.
590	*/
591
592	static void ei_tx_intr(struct net_device *dev)
593	{
594	unsigned long e8390_base = dev->base_addr;
595	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
596	int status = ei_inb(e8390_base + EN0_TSR);
597
598	ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
599
600	/*
601	* There are two Tx buffers, see which one finished, and trigger
602	* the send of another one if it exists.
603	*/
604	ei_local->txqueue--;
605
606	if (ei_local->tx1 < 0)
607	{
608	if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
609	printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
610	ei_local->name, ei_local->lasttx, ei_local->tx1);
611	ei_local->tx1 = 0;
612	if (ei_local->tx2 > 0)
613	{
614	ei_local->txing = 1;
615	NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
616	dev->trans_start = jiffies;
617	ei_local->tx2 = -1,
618	ei_local->lasttx = 2;
619	}
620	else ei_local->lasttx = 20, ei_local->txing = 0;
621	}
622	else if (ei_local->tx2 < 0)
623	{
624	if (ei_local->lasttx != 2 && ei_local->lasttx != -2)
625	printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
626	ei_local->name, ei_local->lasttx, ei_local->tx2);
627	ei_local->tx2 = 0;
628	if (ei_local->tx1 > 0)
629	{
630	ei_local->txing = 1;
631	NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
632	dev->trans_start = jiffies;
633	ei_local->tx1 = -1;
634	ei_local->lasttx = 1;
635	}
636	else
637	ei_local->lasttx = 10, ei_local->txing = 0;
638	}
639	// else printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
640	// dev->name, ei_local->lasttx);
641
642	/* Minimize Tx latency: update the statistics after we restart TXing. */
643	if (status & ENTSR_COL)
644	dev->stats.collisions++;
645	if (status & ENTSR_PTX)
646	dev->stats.tx_packets++;
647	else
648	{
649	dev->stats.tx_errors++;
650	if (status & ENTSR_ABT)
651	{
652	dev->stats.tx_aborted_errors++;
653	dev->stats.collisions += 16;
654	}
655	if (status & ENTSR_CRS)
656	dev->stats.tx_carrier_errors++;
657	if (status & ENTSR_FU)
658	dev->stats.tx_fifo_errors++;
659	if (status & ENTSR_CDH)
660	dev->stats.tx_heartbeat_errors++;
661	if (status & ENTSR_OWC)
662	dev->stats.tx_window_errors++;
663	}
664	netif_wake_queue(dev);
665	}
666
667	/**
668	* ei_receive - receive some packets
669	* @dev: network device with which receive will be run
670	*
671	* We have a good packet(s), get it/them out of the buffers.
672	* Called with lock held.
673	*/
674
675	static void ei_receive(struct net_device *dev)
676	{
677	unsigned long e8390_base = dev->base_addr;
678	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
679	unsigned char rxing_page, this_frame, next_frame;
680	unsigned short current_offset;
681	int rx_pkt_count = 0;
682	struct e8390_pkt_hdr rx_frame;
683	int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
684
685	while (++rx_pkt_count < 10)
686	{
687	int pkt_len, pkt_stat;
688
689	/* Get the rx page (incoming packet pointer). */
690	ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
691	rxing_page = ei_inb_p(e8390_base + EN1_CURPAG);
692	ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
693
694	/* Remove one frame from the ring. Boundary is always a page behind. */
695	this_frame = ei_inb_p(e8390_base + EN0_BOUNDARY) + 1;
696	if (this_frame >= ei_local->stop_page)
697	this_frame = ei_local->rx_start_page;
698
699	/* Someday we'll omit the previous, iff we never get this message.
700	(There is at least one clone claimed to have a problem.)
701
702	Keep quiet if it looks like a card removal. One problem here
703	is that some clones crash in roughly the same way.
704	*/
705	if (ei_debug > 0 && this_frame != ei_local->current_page && (this_frame!=0x0 \|\| rxing_page!=0xFF))
706	printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
707	dev->name, this_frame, ei_local->current_page);
708
709	if (this_frame == rxing_page) /* Read all the frames? */
710	break; /* Done for now */
711
712	current_offset = this_frame << 8;
713	ei_get_8390_hdr(dev, &rx_frame, this_frame);
714
715	pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
716	pkt_stat = rx_frame.status;
717
718	next_frame = this_frame + 1 + ((pkt_len+4)>>8);
719
720	/* Check for bogosity warned by 3c503 book: the status byte is never
721	written. This happened a lot during testing! This code should be
722	cleaned up someday. */
723	if (rx_frame.next != next_frame
724	&& rx_frame.next != next_frame + 1
725	&& rx_frame.next != next_frame - num_rx_pages
726	&& rx_frame.next != next_frame + 1 - num_rx_pages) {
727	ei_local->current_page = rxing_page;
728	ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
729	dev->stats.rx_errors++;
730	continue;
731	}
732
733	if (pkt_len < 60 \|\| pkt_len > 1518)
734	{
735	if (ei_debug)
736	printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
737	dev->name, rx_frame.count, rx_frame.status,
738	rx_frame.next);
739	dev->stats.rx_errors++;
740	dev->stats.rx_length_errors++;
741	}
742	else if ((pkt_stat & 0x0F) == ENRSR_RXOK)
743	{
744	struct sk_buff *skb;
745
746	skb = dev_alloc_skb(pkt_len+2);
747	if (skb == NULL)
748	{
749	if (ei_debug > 1)
750	printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
751	dev->name, pkt_len);
752	dev->stats.rx_dropped++;
753	break;
754	}
755	else
756	{
757	skb_reserve(skb,2); /* IP headers on 16 byte boundaries */
758	skb_put(skb, pkt_len); /* Make room */
759	ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
760	skb->protocol=eth_type_trans(skb,dev);
761	netif_rx(skb);
762	dev->stats.rx_packets++;
763	dev->stats.rx_bytes += pkt_len;
764	if (pkt_stat & ENRSR_PHY)
765	dev->stats.multicast++;
766	}
767	}
768	else
769	{
770	if (ei_debug)
771	printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
772	dev->name, rx_frame.status, rx_frame.next,
773	rx_frame.count);
774	dev->stats.rx_errors++;
775	/* NB: The NIC counts CRC, frame and missed errors. */
776	if (pkt_stat & ENRSR_FO)
777	dev->stats.rx_fifo_errors++;
778	}
779	next_frame = rx_frame.next;
780
781	/* This _should_ never happen: it's here for avoiding bad clones. */
782	if (next_frame >= ei_local->stop_page) {
783	printk("%s: next frame inconsistency, %#2x\n", dev->name,
784	next_frame);
785	next_frame = ei_local->rx_start_page;
786	}
787	ei_local->current_page = next_frame;
788	ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
789	}
790
791	/* We used to also ack ENISR_OVER here, but that would sometimes mask
792	a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
793	ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
794	return;
795	}
796
797	/**
798	* ei_rx_overrun - handle receiver overrun
799	* @dev: network device which threw exception
800	*
801	* We have a receiver overrun: we have to kick the 8390 to get it started
802	* again. Problem is that you have to kick it exactly as NS prescribes in
803	* the updated datasheets, or "the NIC may act in an unpredictable manner."
804	* This includes causing "the NIC to defer indefinitely when it is stopped
805	* on a busy network." Ugh.
806	* Called with lock held. Don't call this with the interrupts off or your
807	* computer will hate you - it takes 10ms or so.
808	*/
809
810	static void ei_rx_overrun(struct net_device *dev)
811	{
812	unsigned long e8390_base = dev->base_addr;
813	unsigned char was_txing, must_resend = 0;
814	/* ei_local is used on some platforms via the EI_SHIFT macro */
815	struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
816
817	/*
818	* Record whether a Tx was in progress and then issue the
819	* stop command.
820	*/
821	was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
822	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
823
824	if (ei_debug > 1)
825	printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
826	dev->stats.rx_over_errors++;
827
828	/*
829	* Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
830	* Early datasheets said to poll the reset bit, but now they say that
831	* it "is not a reliable indicator and subsequently should be ignored."
832	* We wait at least 10ms.
833	*/
834
835	mdelay(10);
836
837	/*
838	* Reset RBCR[01] back to zero as per magic incantation.
839	*/
840	ei_outb_p(0x00, e8390_base+EN0_RCNTLO);
841	ei_outb_p(0x00, e8390_base+EN0_RCNTHI);
842
843	/*
844	* See if any Tx was interrupted or not. According to NS, this
845	* step is vital, and skipping it will cause no end of havoc.
846	*/
847
848	if (was_txing)
849	{
850	unsigned char tx_completed = ei_inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
851	if (!tx_completed)
852	must_resend = 1;
853	}
854
855	/*
856	* Have to enter loopback mode and then restart the NIC before
857	* you are allowed to slurp packets up off the ring.
858	*/
859	ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
860	ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
861
862	/*
863	* Clear the Rx ring of all the debris, and ack the interrupt.
864	*/
865	ei_receive(dev);
866	ei_outb_p(ENISR_OVER, e8390_base+EN0_ISR);
867
868	/*
869	* Leave loopback mode, and resend any packet that got stopped.
870	*/
871	ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR);
872	if (must_resend)
873	ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
874	}
875
876	/*
877	* Collect the stats. This is called unlocked and from several contexts.
878	*/
879
880	static struct net_device_stats __ei_get_stats(struct net_device dev)
881	{
882	unsigned long ioaddr = dev->base_addr;
883	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
884	unsigned long flags;
885
886	/* If the card is stopped, just return the present stats. */
887	if (!netif_running(dev))
888	return &dev->stats;
889
890	spin_lock_irqsave(&ei_local->page_lock,flags);
891	/* Read the counter registers, assuming we are in page 0. */
892	dev->stats.rx_frame_errors += ei_inb_p(ioaddr + EN0_COUNTER0);
893	dev->stats.rx_crc_errors += ei_inb_p(ioaddr + EN0_COUNTER1);
894	dev->stats.rx_missed_errors+= ei_inb_p(ioaddr + EN0_COUNTER2);
895	spin_unlock_irqrestore(&ei_local->page_lock, flags);
896
897	return &dev->stats;
898	}
899
900	/*
901	* Form the 64 bit 8390 multicast table from the linked list of addresses
902	* associated with this dev structure.
903	*/
904
905	static inline void make_mc_bits(u8 bits, struct net_device dev)
906	{
907	struct dev_mc_list *dmi;
908
909	for (dmi=dev->mc_list; dmi; dmi=dmi->next)
910	{
911	u32 crc;
912	if (dmi->dmi_addrlen != ETH_ALEN)
913	{
914	printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
915	continue;
916	}
917	crc = ether_crc(ETH_ALEN, dmi->dmi_addr);
918	/*
919	* The 8390 uses the 6 most significant bits of the
920	* CRC to index the multicast table.
921	*/
922	bits[crc>>29] \|= (1<<((crc>>26)&7));
923	}
924	}
925
926	/**
927	* do_set_multicast_list - set/clear multicast filter
928	* @dev: net device for which multicast filter is adjusted
929	*
930	* Set or clear the multicast filter for this adaptor. May be called
931	* from a BH in 2.1.x. Must be called with lock held.
932	*/
933
934	static void do_set_multicast_list(struct net_device *dev)
935	{
936	unsigned long e8390_base = dev->base_addr;
937	int i;
938	struct ei_device ei_local = (struct ei_device)netdev_priv(dev);
939
940	if (!(dev->flags&(IFF_PROMISC\|IFF_ALLMULTI)))
941	{
942	memset(ei_local->mcfilter, 0, 8);
943	if (dev->mc_list)
944	make_mc_bits(ei_local->mcfilter, dev);
945	}
946	else
947	memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */
948
949	/*
950	* DP8390 manuals don't specify any magic sequence for altering
951	* the multicast regs on an already running card. To be safe, we
952	* ensure multicast mode is off prior to loading up the new hash
953	* table. If this proves to be not enough, we can always resort
954	* to stopping the NIC, loading the table and then restarting.
955	*
956	* Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC
957	* Elite16) appear to be write-only. The NS 8390 data sheet lists
958	* them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and
959	* Ultra32 EISA) appears to have this bug fixed.
960	*/
961
962	if (netif_running(dev))
963	ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
964	ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
965	for(i = 0; i < 8; i++)
966	{
967	ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
968	#ifndef BUG_83C690
969	if(ei_inb_p(e8390_base + EN1_MULT_SHIFT(i))!=ei_local->mcfilter[i])
970	printk(KERN_ERR "Multicast filter read/write mismap %d\n",i);
971	#endif
972	}
973	ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
974
975	if(dev->flags&IFF_PROMISC)
976	ei_outb_p(E8390_RXCONFIG \| 0x18, e8390_base + EN0_RXCR);
977	else if(dev->flags&IFF_ALLMULTI \|\| dev->mc_list)
978	ei_outb_p(E8390_RXCONFIG \| 0x08, e8390_base + EN0_RXCR);
979	else
980	ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
981	}
982
983	/*
984	* Called without lock held. This is invoked from user context and may
985	* be parallel to just about everything else. Its also fairly quick and
986	* not called too often. Must protect against both bh and irq users
987	*/
988
989	static void __ei_set_multicast_list(struct net_device *dev)
990	{
991	unsigned long flags;
992	struct ei_device ei_local = (struct ei_device)netdev_priv(dev);
993
994	spin_lock_irqsave(&ei_local->page_lock, flags);
995	do_set_multicast_list(dev);
996	spin_unlock_irqrestore(&ei_local->page_lock, flags);
997	}
998
999	/**
1000	* ethdev_setup - init rest of 8390 device struct
1001	* @dev: network device structure to init
1002	*
1003	* Initialize the rest of the 8390 device structure. Do NOT __init
1004	* this, as it is used by 8390 based modular drivers too.
1005	*/
1006
1007	static void ethdev_setup(struct net_device *dev)
1008	{
1009	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
1010	if (ei_debug > 1)
1011	printk(version);
1012
1013	ether_setup(dev);
1014
1015	spin_lock_init(&ei_local->page_lock);
1016	}
1017
1018	/**
1019	* alloc_ei_netdev - alloc_etherdev counterpart for 8390
1020	* @size: extra bytes to allocate
1021	*
1022	* Allocate 8390-specific net_device.
1023	*/
1024	static struct net_device *____alloc_ei_netdev(int size)
1025	{
1026	return alloc_netdev(sizeof(struct ei_device) + size, "eth%d",
1027	ethdev_setup);
1028	}
1029
1030
1031
1032
1033	/* This page of functions should be 8390 generic */
1034	/* Follow National Semi's recommendations for initializing the "NIC". */
1035
1036	/**
1037	* NS8390_init - initialize 8390 hardware
1038	* @dev: network device to initialize
1039	* @startp: boolean. non-zero value to initiate chip processing
1040	*
1041	* Must be called with lock held.
1042	*/
1043
1044	static void __NS8390_init(struct net_device *dev, int startp)
1045	{
1046	unsigned long e8390_base = dev->base_addr;
1047	struct ei_device ei_local = (struct ei_device ) netdev_priv(dev);
1048	int i;
1049	int endcfg = ei_local->word16
1050	? (0x48 \| ENDCFG_WTS \| (ei_local->bigendian ? ENDCFG_BOS : 0))
1051	: 0x48;
1052
1053	if(sizeof(struct e8390_pkt_hdr)!=4)
1054	panic("8390.c: header struct mispacked\n");
1055	/* Follow National Semi's recommendations for initing the DP83902. */
1056	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1057	ei_outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */
1058	/* Clear the remote byte count registers. */
1059	ei_outb_p(0x00, e8390_base + EN0_RCNTLO);
1060	ei_outb_p(0x00, e8390_base + EN0_RCNTHI);
1061	/* Set to monitor and loopback mode -- this is vital!. */
1062	ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
1063	ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1064	/* Set the transmit page and receive ring. */
1065	ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1066	ei_local->tx1 = ei_local->tx2 = 0;
1067	ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1068	ei_outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/
1069	ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */
1070	ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1071	/* Clear the pending interrupts and mask. */
1072	ei_outb_p(0xFF, e8390_base + EN0_ISR);
1073	ei_outb_p(0x00, e8390_base + EN0_IMR);
1074
1075	/* Copy the station address into the DS8390 registers. */
1076
1077	ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1078	for(i = 0; i < 6; i++)
1079	{
1080	ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1081	if (ei_debug > 1 && ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1082	printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
1083	}
1084
1085	ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1086	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1087
1088	netif_start_queue(dev);
1089	ei_local->tx1 = ei_local->tx2 = 0;
1090	ei_local->txing = 0;
1091
1092	if (startp)
1093	{
1094	ei_outb_p(0xff, e8390_base + EN0_ISR);
1095	ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1096	ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1097	ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
1098	/* 3c503 TechMan says rxconfig only after the NIC is started. */
1099	ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */
1100	do_set_multicast_list(dev); /* (re)load the mcast table */
1101	}
1102	}
1103
1104	/* Trigger a transmit start, assuming the length is valid.
1105	Always called with the page lock held */
1106
1107	static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1108	int start_page)
1109	{
1110	unsigned long e8390_base = dev->base_addr;
1111	struct ei_device ei_local __attribute((unused)) = (struct ei_device ) netdev_priv(dev);
1112
1113	ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
1114
1115	if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS)
1116	{
1117	printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
1118	dev->name);
1119	return;
1120	}
1121	ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1122	ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1123	ei_outb_p(start_page, e8390_base + EN0_TPSR);
1124	ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1125	}
1126

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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7

Kernel

Kernel Git Source Tree

Root/drivers/net/lib8390.c

interactive