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Al Viro6c3561b2006-10-10 00:19:36 +01001/* 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
105int ei_debug = 1;
106#endif
107
108/* Index to functions. */
109static void ei_tx_intr(struct net_device *dev);
110static void ei_tx_err(struct net_device *dev);
111static void ei_tx_timeout(struct net_device *dev);
112static void ei_receive(struct net_device *dev);
113static void ei_rx_overrun(struct net_device *dev);
114
115/* Routines generic to NS8390-based boards. */
116static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
117 int start_page);
118static void set_multicast_list(struct net_device *dev);
119static void do_set_multicast_list(struct net_device *dev);
120static void __NS8390_init(struct net_device *dev, int startp);
121
122/*
123 * SMP and the 8390 setup.
124 *
125 * The 8390 isnt exactly designed to be multithreaded on RX/TX. There is
126 * a page register that controls bank and packet buffer access. We guard
127 * this with ei_local->page_lock. Nobody should assume or set the page other
128 * than zero when the lock is not held. Lock holders must restore page 0
129 * before unlocking. Even pure readers must take the lock to protect in
130 * page 0.
131 *
132 * To make life difficult the chip can also be very slow. We therefore can't
133 * just use spinlocks. For the longer lockups we disable the irq the device
134 * sits on and hold the lock. We must hold the lock because there is a dual
135 * processor case other than interrupts (get stats/set multicast list in
136 * parallel with each other and transmit).
137 *
138 * Note: in theory we can just disable the irq on the card _but_ there is
139 * a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
140 * enter lock, take the queued irq. So we waddle instead of flying.
141 *
142 * Finally by special arrangement for the purpose of being generally
143 * annoying the transmit function is called bh atomic. That places
144 * restrictions on the user context callers as disable_irq won't save
145 * them.
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200146 *
147 * Additional explanation of problems with locking by Alan Cox:
148 *
149 * "The author (me) didn't use spin_lock_irqsave because the slowness of the
150 * card means that approach caused horrible problems like losing serial data
Robert P. J. Day14e4a0f2008-02-03 15:12:15 +0200151 * at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200152 * chips with FPGA front ends.
153 *
154 * Ok the logic behind the 8390 is very simple:
155 *
156 * Things to know
157 * - IRQ delivery is asynchronous to the PCI bus
158 * - Blocking the local CPU IRQ via spin locks was too slow
159 * - The chip has register windows needing locking work
160 *
161 * So the path was once (I say once as people appear to have changed it
162 * in the mean time and it now looks rather bogus if the changes to use
163 * disable_irq_nosync_irqsave are disabling the local IRQ)
164 *
165 *
166 * Take the page lock
167 * Mask the IRQ on chip
168 * Disable the IRQ (but not mask locally- someone seems to have
169 * broken this with the lock validator stuff)
170 * [This must be _nosync as the page lock may otherwise
171 * deadlock us]
172 * Drop the page lock and turn IRQs back on
173 *
174 * At this point an existing IRQ may still be running but we can't
175 * get a new one
176 *
177 * Take the lock (so we know the IRQ has terminated) but don't mask
178 * the IRQs on the processor
179 * Set irqlock [for debug]
180 *
181 * Transmit (slow as ****)
182 *
183 * re-enable the IRQ
184 *
185 *
186 * We have to use disable_irq because otherwise you will get delayed
187 * interrupts on the APIC bus deadlocking the transmit path.
188 *
189 * Quite hairy but the chip simply wasn't designed for SMP and you can't
190 * even ACK an interrupt without risking corrupting other parallel
191 * activities on the chip." [lkml, 25 Jul 2007]
Al Viro6c3561b2006-10-10 00:19:36 +0100192 */
193
194
195
196/**
197 * ei_open - Open/initialize the board.
198 * @dev: network device to initialize
199 *
200 * This routine goes all-out, setting everything
201 * up anew at each open, even though many of these registers should only
202 * need to be set once at boot.
203 */
204static int __ei_open(struct net_device *dev)
205{
206 unsigned long flags;
207 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
208
209 /* The card I/O part of the driver (e.g. 3c503) can hook a Tx timeout
210 wrapper that does e.g. media check & then calls ei_tx_timeout. */
211 if (dev->tx_timeout == NULL)
212 dev->tx_timeout = ei_tx_timeout;
213 if (dev->watchdog_timeo <= 0)
214 dev->watchdog_timeo = TX_TIMEOUT;
215
216 /*
217 * Grab the page lock so we own the register set, then call
218 * the init function.
219 */
220
221 spin_lock_irqsave(&ei_local->page_lock, flags);
222 __NS8390_init(dev, 1);
223 /* Set the flag before we drop the lock, That way the IRQ arrives
224 after its set and we get no silly warnings */
225 netif_start_queue(dev);
226 spin_unlock_irqrestore(&ei_local->page_lock, flags);
227 ei_local->irqlock = 0;
228 return 0;
229}
230
231/**
232 * ei_close - shut down network device
233 * @dev: network device to close
234 *
235 * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
236 */
237static int __ei_close(struct net_device *dev)
238{
239 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
240 unsigned long flags;
241
242 /*
243 * Hold the page lock during close
244 */
245
246 spin_lock_irqsave(&ei_local->page_lock, flags);
247 __NS8390_init(dev, 0);
248 spin_unlock_irqrestore(&ei_local->page_lock, flags);
249 netif_stop_queue(dev);
250 return 0;
251}
252
253/**
254 * ei_tx_timeout - handle transmit time out condition
255 * @dev: network device which has apparently fallen asleep
256 *
257 * Called by kernel when device never acknowledges a transmit has
258 * completed (or failed) - i.e. never posted a Tx related interrupt.
259 */
260
261static void ei_tx_timeout(struct net_device *dev)
262{
263 unsigned long e8390_base = dev->base_addr;
264 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
265 int txsr, isr, tickssofar = jiffies - dev->trans_start;
266 unsigned long flags;
267
Al Viro6c3561b2006-10-10 00:19:36 +0100268 ei_local->stat.tx_errors++;
269
270 spin_lock_irqsave(&ei_local->page_lock, flags);
271 txsr = ei_inb(e8390_base+EN0_TSR);
272 isr = ei_inb(e8390_base+EN0_ISR);
273 spin_unlock_irqrestore(&ei_local->page_lock, flags);
274
275 printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
276 dev->name, (txsr & ENTSR_ABT) ? "excess collisions." :
277 (isr) ? "lost interrupt?" : "cable problem?", txsr, isr, tickssofar);
278
279 if (!isr && !ei_local->stat.tx_packets)
280 {
281 /* The 8390 probably hasn't gotten on the cable yet. */
282 ei_local->interface_num ^= 1; /* Try a different xcvr. */
283 }
284
285 /* Ugly but a reset can be slow, yet must be protected */
286
287 disable_irq_nosync_lockdep(dev->irq);
288 spin_lock(&ei_local->page_lock);
289
290 /* Try to restart the card. Perhaps the user has fixed something. */
291 ei_reset_8390(dev);
292 __NS8390_init(dev, 1);
293
294 spin_unlock(&ei_local->page_lock);
295 enable_irq_lockdep(dev->irq);
296 netif_wake_queue(dev);
297}
298
299/**
300 * ei_start_xmit - begin packet transmission
301 * @skb: packet to be sent
302 * @dev: network device to which packet is sent
303 *
304 * Sends a packet to an 8390 network device.
305 */
306
307static int ei_start_xmit(struct sk_buff *skb, struct net_device *dev)
308{
309 unsigned long e8390_base = dev->base_addr;
310 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
311 int send_length = skb->len, output_page;
312 unsigned long flags;
313 char buf[ETH_ZLEN];
314 char *data = skb->data;
315
316 if (skb->len < ETH_ZLEN) {
317 memset(buf, 0, ETH_ZLEN); /* more efficient than doing just the needed bits */
318 memcpy(buf, data, skb->len);
319 send_length = ETH_ZLEN;
320 data = buf;
321 }
322
323 /* Mask interrupts from the ethercard.
324 SMP: We have to grab the lock here otherwise the IRQ handler
325 on another CPU can flip window and race the IRQ mask set. We end
326 up trashing the mcast filter not disabling irqs if we don't lock */
327
328 spin_lock_irqsave(&ei_local->page_lock, flags);
329 ei_outb_p(0x00, e8390_base + EN0_IMR);
330 spin_unlock_irqrestore(&ei_local->page_lock, flags);
331
332
333 /*
334 * Slow phase with lock held.
335 */
336
337 disable_irq_nosync_lockdep_irqsave(dev->irq, &flags);
338
339 spin_lock(&ei_local->page_lock);
340
341 ei_local->irqlock = 1;
342
343 /*
344 * We have two Tx slots available for use. Find the first free
345 * slot, and then perform some sanity checks. With two Tx bufs,
346 * you get very close to transmitting back-to-back packets. With
347 * only one Tx buf, the transmitter sits idle while you reload the
348 * card, leaving a substantial gap between each transmitted packet.
349 */
350
351 if (ei_local->tx1 == 0)
352 {
353 output_page = ei_local->tx_start_page;
354 ei_local->tx1 = send_length;
355 if (ei_debug && ei_local->tx2 > 0)
356 printk(KERN_DEBUG "%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
357 dev->name, ei_local->tx2, ei_local->lasttx, ei_local->txing);
358 }
359 else if (ei_local->tx2 == 0)
360 {
361 output_page = ei_local->tx_start_page + TX_PAGES/2;
362 ei_local->tx2 = send_length;
363 if (ei_debug && ei_local->tx1 > 0)
364 printk(KERN_DEBUG "%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
365 dev->name, ei_local->tx1, ei_local->lasttx, ei_local->txing);
366 }
367 else
368 { /* We should never get here. */
369 if (ei_debug)
370 printk(KERN_DEBUG "%s: No Tx buffers free! tx1=%d tx2=%d last=%d\n",
371 dev->name, ei_local->tx1, ei_local->tx2, ei_local->lasttx);
372 ei_local->irqlock = 0;
373 netif_stop_queue(dev);
374 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
375 spin_unlock(&ei_local->page_lock);
376 enable_irq_lockdep_irqrestore(dev->irq, &flags);
377 ei_local->stat.tx_errors++;
378 return 1;
379 }
380
381 /*
382 * Okay, now upload the packet and trigger a send if the transmitter
383 * isn't already sending. If it is busy, the interrupt handler will
384 * trigger the send later, upon receiving a Tx done interrupt.
385 */
386
387 ei_block_output(dev, send_length, data, output_page);
388
389 if (! ei_local->txing)
390 {
391 ei_local->txing = 1;
392 NS8390_trigger_send(dev, send_length, output_page);
393 dev->trans_start = jiffies;
394 if (output_page == ei_local->tx_start_page)
395 {
396 ei_local->tx1 = -1;
397 ei_local->lasttx = -1;
398 }
399 else
400 {
401 ei_local->tx2 = -1;
402 ei_local->lasttx = -2;
403 }
404 }
405 else ei_local->txqueue++;
406
407 if (ei_local->tx1 && ei_local->tx2)
408 netif_stop_queue(dev);
409 else
410 netif_start_queue(dev);
411
412 /* Turn 8390 interrupts back on. */
413 ei_local->irqlock = 0;
414 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
415
416 spin_unlock(&ei_local->page_lock);
417 enable_irq_lockdep_irqrestore(dev->irq, &flags);
418
419 dev_kfree_skb (skb);
420 ei_local->stat.tx_bytes += send_length;
421
422 return 0;
423}
424
425/**
426 * ei_interrupt - handle the interrupts from an 8390
427 * @irq: interrupt number
428 * @dev_id: a pointer to the net_device
429 *
430 * Handle the ether interface interrupts. We pull packets from
431 * the 8390 via the card specific functions and fire them at the networking
432 * stack. We also handle transmit completions and wake the transmit path if
433 * necessary. We also update the counters and do other housekeeping as
434 * needed.
435 */
436
437static irqreturn_t __ei_interrupt(int irq, void *dev_id)
438{
439 struct net_device *dev = dev_id;
440 unsigned long e8390_base = dev->base_addr;
441 int interrupts, nr_serviced = 0;
442 struct ei_device *ei_local = netdev_priv(dev);
443
444 /*
445 * Protect the irq test too.
446 */
447
448 spin_lock(&ei_local->page_lock);
449
450 if (ei_local->irqlock)
451 {
452#if 1 /* This might just be an interrupt for a PCI device sharing this line */
453 /* The "irqlock" check is only for testing. */
454 printk(ei_local->irqlock
455 ? "%s: Interrupted while interrupts are masked! isr=%#2x imr=%#2x.\n"
456 : "%s: Reentering the interrupt handler! isr=%#2x imr=%#2x.\n",
457 dev->name, ei_inb_p(e8390_base + EN0_ISR),
458 ei_inb_p(e8390_base + EN0_IMR));
459#endif
460 spin_unlock(&ei_local->page_lock);
461 return IRQ_NONE;
462 }
463
464 /* Change to page 0 and read the intr status reg. */
465 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
466 if (ei_debug > 3)
467 printk(KERN_DEBUG "%s: interrupt(isr=%#2.2x).\n", dev->name,
468 ei_inb_p(e8390_base + EN0_ISR));
469
470 /* !!Assumption!! -- we stay in page 0. Don't break this. */
471 while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0
472 && ++nr_serviced < MAX_SERVICE)
473 {
474 if (!netif_running(dev)) {
475 printk(KERN_WARNING "%s: interrupt from stopped card\n", dev->name);
476 /* rmk - acknowledge the interrupts */
477 ei_outb_p(interrupts, e8390_base + EN0_ISR);
478 interrupts = 0;
479 break;
480 }
481 if (interrupts & ENISR_OVER)
482 ei_rx_overrun(dev);
483 else if (interrupts & (ENISR_RX+ENISR_RX_ERR))
484 {
485 /* Got a good (?) packet. */
486 ei_receive(dev);
487 }
488 /* Push the next to-transmit packet through. */
489 if (interrupts & ENISR_TX)
490 ei_tx_intr(dev);
491 else if (interrupts & ENISR_TX_ERR)
492 ei_tx_err(dev);
493
494 if (interrupts & ENISR_COUNTERS)
495 {
496 ei_local->stat.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0);
497 ei_local->stat.rx_crc_errors += ei_inb_p(e8390_base + EN0_COUNTER1);
498 ei_local->stat.rx_missed_errors+= ei_inb_p(e8390_base + EN0_COUNTER2);
499 ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
500 }
501
502 /* Ignore any RDC interrupts that make it back to here. */
503 if (interrupts & ENISR_RDC)
504 {
505 ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR);
506 }
507
508 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
509 }
510
511 if (interrupts && ei_debug)
512 {
513 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
514 if (nr_serviced >= MAX_SERVICE)
515 {
516 /* 0xFF is valid for a card removal */
517 if(interrupts!=0xFF)
518 printk(KERN_WARNING "%s: Too much work at interrupt, status %#2.2x\n",
519 dev->name, interrupts);
520 ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
521 } else {
522 printk(KERN_WARNING "%s: unknown interrupt %#2x\n", dev->name, interrupts);
523 ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
524 }
525 }
526 spin_unlock(&ei_local->page_lock);
527 return IRQ_RETVAL(nr_serviced > 0);
528}
529
530#ifdef CONFIG_NET_POLL_CONTROLLER
531static void __ei_poll(struct net_device *dev)
532{
533 disable_irq_lockdep(dev->irq);
534 __ei_interrupt(dev->irq, dev);
535 enable_irq_lockdep(dev->irq);
536}
537#endif
538
539/**
540 * ei_tx_err - handle transmitter error
541 * @dev: network device which threw the exception
542 *
543 * A transmitter error has happened. Most likely excess collisions (which
544 * is a fairly normal condition). If the error is one where the Tx will
545 * have been aborted, we try and send another one right away, instead of
546 * letting the failed packet sit and collect dust in the Tx buffer. This
547 * is a much better solution as it avoids kernel based Tx timeouts, and
548 * an unnecessary card reset.
549 *
550 * Called with lock held.
551 */
552
553static void ei_tx_err(struct net_device *dev)
554{
555 unsigned long e8390_base = dev->base_addr;
556 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
557 unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR);
558 unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
559
560#ifdef VERBOSE_ERROR_DUMP
561 printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
562 if (txsr & ENTSR_ABT)
563 printk("excess-collisions ");
564 if (txsr & ENTSR_ND)
565 printk("non-deferral ");
566 if (txsr & ENTSR_CRS)
567 printk("lost-carrier ");
568 if (txsr & ENTSR_FU)
569 printk("FIFO-underrun ");
570 if (txsr & ENTSR_CDH)
571 printk("lost-heartbeat ");
572 printk("\n");
573#endif
574
575 ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
576
577 if (tx_was_aborted)
578 ei_tx_intr(dev);
579 else
580 {
581 ei_local->stat.tx_errors++;
582 if (txsr & ENTSR_CRS) ei_local->stat.tx_carrier_errors++;
583 if (txsr & ENTSR_CDH) ei_local->stat.tx_heartbeat_errors++;
584 if (txsr & ENTSR_OWC) ei_local->stat.tx_window_errors++;
585 }
586}
587
588/**
589 * ei_tx_intr - transmit interrupt handler
590 * @dev: network device for which tx intr is handled
591 *
592 * We have finished a transmit: check for errors and then trigger the next
593 * packet to be sent. Called with lock held.
594 */
595
596static void ei_tx_intr(struct net_device *dev)
597{
598 unsigned long e8390_base = dev->base_addr;
599 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
600 int status = ei_inb(e8390_base + EN0_TSR);
601
602 ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
603
604 /*
605 * There are two Tx buffers, see which one finished, and trigger
606 * the send of another one if it exists.
607 */
608 ei_local->txqueue--;
609
610 if (ei_local->tx1 < 0)
611 {
612 if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
613 printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
614 ei_local->name, ei_local->lasttx, ei_local->tx1);
615 ei_local->tx1 = 0;
616 if (ei_local->tx2 > 0)
617 {
618 ei_local->txing = 1;
619 NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
620 dev->trans_start = jiffies;
621 ei_local->tx2 = -1,
622 ei_local->lasttx = 2;
623 }
624 else ei_local->lasttx = 20, ei_local->txing = 0;
625 }
626 else if (ei_local->tx2 < 0)
627 {
628 if (ei_local->lasttx != 2 && ei_local->lasttx != -2)
629 printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
630 ei_local->name, ei_local->lasttx, ei_local->tx2);
631 ei_local->tx2 = 0;
632 if (ei_local->tx1 > 0)
633 {
634 ei_local->txing = 1;
635 NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
636 dev->trans_start = jiffies;
637 ei_local->tx1 = -1;
638 ei_local->lasttx = 1;
639 }
640 else
641 ei_local->lasttx = 10, ei_local->txing = 0;
642 }
643// else printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
644// dev->name, ei_local->lasttx);
645
646 /* Minimize Tx latency: update the statistics after we restart TXing. */
647 if (status & ENTSR_COL)
648 ei_local->stat.collisions++;
649 if (status & ENTSR_PTX)
650 ei_local->stat.tx_packets++;
651 else
652 {
653 ei_local->stat.tx_errors++;
654 if (status & ENTSR_ABT)
655 {
656 ei_local->stat.tx_aborted_errors++;
657 ei_local->stat.collisions += 16;
658 }
659 if (status & ENTSR_CRS)
660 ei_local->stat.tx_carrier_errors++;
661 if (status & ENTSR_FU)
662 ei_local->stat.tx_fifo_errors++;
663 if (status & ENTSR_CDH)
664 ei_local->stat.tx_heartbeat_errors++;
665 if (status & ENTSR_OWC)
666 ei_local->stat.tx_window_errors++;
667 }
668 netif_wake_queue(dev);
669}
670
671/**
672 * ei_receive - receive some packets
673 * @dev: network device with which receive will be run
674 *
675 * We have a good packet(s), get it/them out of the buffers.
676 * Called with lock held.
677 */
678
679static void ei_receive(struct net_device *dev)
680{
681 unsigned long e8390_base = dev->base_addr;
682 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
683 unsigned char rxing_page, this_frame, next_frame;
684 unsigned short current_offset;
685 int rx_pkt_count = 0;
686 struct e8390_pkt_hdr rx_frame;
687 int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
688
689 while (++rx_pkt_count < 10)
690 {
691 int pkt_len, pkt_stat;
692
693 /* Get the rx page (incoming packet pointer). */
694 ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
695 rxing_page = ei_inb_p(e8390_base + EN1_CURPAG);
696 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
697
698 /* Remove one frame from the ring. Boundary is always a page behind. */
699 this_frame = ei_inb_p(e8390_base + EN0_BOUNDARY) + 1;
700 if (this_frame >= ei_local->stop_page)
701 this_frame = ei_local->rx_start_page;
702
703 /* Someday we'll omit the previous, iff we never get this message.
704 (There is at least one clone claimed to have a problem.)
705
706 Keep quiet if it looks like a card removal. One problem here
707 is that some clones crash in roughly the same way.
708 */
709 if (ei_debug > 0 && this_frame != ei_local->current_page && (this_frame!=0x0 || rxing_page!=0xFF))
710 printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
711 dev->name, this_frame, ei_local->current_page);
712
713 if (this_frame == rxing_page) /* Read all the frames? */
714 break; /* Done for now */
715
716 current_offset = this_frame << 8;
717 ei_get_8390_hdr(dev, &rx_frame, this_frame);
718
719 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
720 pkt_stat = rx_frame.status;
721
722 next_frame = this_frame + 1 + ((pkt_len+4)>>8);
723
724 /* Check for bogosity warned by 3c503 book: the status byte is never
725 written. This happened a lot during testing! This code should be
726 cleaned up someday. */
727 if (rx_frame.next != next_frame
728 && rx_frame.next != next_frame + 1
729 && rx_frame.next != next_frame - num_rx_pages
730 && rx_frame.next != next_frame + 1 - num_rx_pages) {
731 ei_local->current_page = rxing_page;
732 ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
733 ei_local->stat.rx_errors++;
734 continue;
735 }
736
737 if (pkt_len < 60 || pkt_len > 1518)
738 {
739 if (ei_debug)
740 printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
741 dev->name, rx_frame.count, rx_frame.status,
742 rx_frame.next);
743 ei_local->stat.rx_errors++;
744 ei_local->stat.rx_length_errors++;
745 }
746 else if ((pkt_stat & 0x0F) == ENRSR_RXOK)
747 {
748 struct sk_buff *skb;
749
750 skb = dev_alloc_skb(pkt_len+2);
751 if (skb == NULL)
752 {
753 if (ei_debug > 1)
754 printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
755 dev->name, pkt_len);
756 ei_local->stat.rx_dropped++;
757 break;
758 }
759 else
760 {
761 skb_reserve(skb,2); /* IP headers on 16 byte boundaries */
Al Viro6c3561b2006-10-10 00:19:36 +0100762 skb_put(skb, pkt_len); /* Make room */
763 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
764 skb->protocol=eth_type_trans(skb,dev);
765 netif_rx(skb);
766 dev->last_rx = jiffies;
767 ei_local->stat.rx_packets++;
768 ei_local->stat.rx_bytes += pkt_len;
769 if (pkt_stat & ENRSR_PHY)
770 ei_local->stat.multicast++;
771 }
772 }
773 else
774 {
775 if (ei_debug)
776 printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
777 dev->name, rx_frame.status, rx_frame.next,
778 rx_frame.count);
779 ei_local->stat.rx_errors++;
780 /* NB: The NIC counts CRC, frame and missed errors. */
781 if (pkt_stat & ENRSR_FO)
782 ei_local->stat.rx_fifo_errors++;
783 }
784 next_frame = rx_frame.next;
785
786 /* This _should_ never happen: it's here for avoiding bad clones. */
787 if (next_frame >= ei_local->stop_page) {
788 printk("%s: next frame inconsistency, %#2x\n", dev->name,
789 next_frame);
790 next_frame = ei_local->rx_start_page;
791 }
792 ei_local->current_page = next_frame;
793 ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
794 }
795
796 /* We used to also ack ENISR_OVER here, but that would sometimes mask
797 a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
798 ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
799 return;
800}
801
802/**
803 * ei_rx_overrun - handle receiver overrun
804 * @dev: network device which threw exception
805 *
806 * We have a receiver overrun: we have to kick the 8390 to get it started
807 * again. Problem is that you have to kick it exactly as NS prescribes in
808 * the updated datasheets, or "the NIC may act in an unpredictable manner."
809 * This includes causing "the NIC to defer indefinitely when it is stopped
810 * on a busy network." Ugh.
811 * Called with lock held. Don't call this with the interrupts off or your
812 * computer will hate you - it takes 10ms or so.
813 */
814
815static void ei_rx_overrun(struct net_device *dev)
816{
817 unsigned long e8390_base = dev->base_addr;
818 unsigned char was_txing, must_resend = 0;
819 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
820
821 /*
822 * Record whether a Tx was in progress and then issue the
823 * stop command.
824 */
825 was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
826 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
827
828 if (ei_debug > 1)
829 printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
830 ei_local->stat.rx_over_errors++;
831
832 /*
833 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
834 * Early datasheets said to poll the reset bit, but now they say that
835 * it "is not a reliable indicator and subsequently should be ignored."
836 * We wait at least 10ms.
837 */
838
839 mdelay(10);
840
841 /*
842 * Reset RBCR[01] back to zero as per magic incantation.
843 */
844 ei_outb_p(0x00, e8390_base+EN0_RCNTLO);
845 ei_outb_p(0x00, e8390_base+EN0_RCNTHI);
846
847 /*
848 * See if any Tx was interrupted or not. According to NS, this
849 * step is vital, and skipping it will cause no end of havoc.
850 */
851
852 if (was_txing)
853 {
854 unsigned char tx_completed = ei_inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
855 if (!tx_completed)
856 must_resend = 1;
857 }
858
859 /*
860 * Have to enter loopback mode and then restart the NIC before
861 * you are allowed to slurp packets up off the ring.
862 */
863 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
864 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
865
866 /*
867 * Clear the Rx ring of all the debris, and ack the interrupt.
868 */
869 ei_receive(dev);
870 ei_outb_p(ENISR_OVER, e8390_base+EN0_ISR);
871
872 /*
873 * Leave loopback mode, and resend any packet that got stopped.
874 */
875 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR);
876 if (must_resend)
877 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
878}
879
880/*
881 * Collect the stats. This is called unlocked and from several contexts.
882 */
883
884static struct net_device_stats *get_stats(struct net_device *dev)
885{
886 unsigned long ioaddr = dev->base_addr;
887 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
888 unsigned long flags;
889
890 /* If the card is stopped, just return the present stats. */
891 if (!netif_running(dev))
892 return &ei_local->stat;
893
894 spin_lock_irqsave(&ei_local->page_lock,flags);
895 /* Read the counter registers, assuming we are in page 0. */
896 ei_local->stat.rx_frame_errors += ei_inb_p(ioaddr + EN0_COUNTER0);
897 ei_local->stat.rx_crc_errors += ei_inb_p(ioaddr + EN0_COUNTER1);
898 ei_local->stat.rx_missed_errors+= ei_inb_p(ioaddr + EN0_COUNTER2);
899 spin_unlock_irqrestore(&ei_local->page_lock, flags);
900
901 return &ei_local->stat;
902}
903
904/*
905 * Form the 64 bit 8390 multicast table from the linked list of addresses
906 * associated with this dev structure.
907 */
908
909static inline void make_mc_bits(u8 *bits, struct net_device *dev)
910{
911 struct dev_mc_list *dmi;
912
913 for (dmi=dev->mc_list; dmi; dmi=dmi->next)
914 {
915 u32 crc;
916 if (dmi->dmi_addrlen != ETH_ALEN)
917 {
918 printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
919 continue;
920 }
921 crc = ether_crc(ETH_ALEN, dmi->dmi_addr);
922 /*
923 * The 8390 uses the 6 most significant bits of the
924 * CRC to index the multicast table.
925 */
926 bits[crc>>29] |= (1<<((crc>>26)&7));
927 }
928}
929
930/**
931 * do_set_multicast_list - set/clear multicast filter
932 * @dev: net device for which multicast filter is adjusted
933 *
934 * Set or clear the multicast filter for this adaptor. May be called
935 * from a BH in 2.1.x. Must be called with lock held.
936 */
937
938static void do_set_multicast_list(struct net_device *dev)
939{
940 unsigned long e8390_base = dev->base_addr;
941 int i;
942 struct ei_device *ei_local = (struct ei_device*)netdev_priv(dev);
943
944 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI)))
945 {
946 memset(ei_local->mcfilter, 0, 8);
947 if (dev->mc_list)
948 make_mc_bits(ei_local->mcfilter, dev);
949 }
950 else
951 memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */
952
953 /*
954 * DP8390 manuals don't specify any magic sequence for altering
955 * the multicast regs on an already running card. To be safe, we
956 * ensure multicast mode is off prior to loading up the new hash
957 * table. If this proves to be not enough, we can always resort
958 * to stopping the NIC, loading the table and then restarting.
959 *
960 * Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC
961 * Elite16) appear to be write-only. The NS 8390 data sheet lists
962 * them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and
963 * Ultra32 EISA) appears to have this bug fixed.
964 */
965
966 if (netif_running(dev))
967 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
968 ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
969 for(i = 0; i < 8; i++)
970 {
971 ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
972#ifndef BUG_83C690
973 if(ei_inb_p(e8390_base + EN1_MULT_SHIFT(i))!=ei_local->mcfilter[i])
974 printk(KERN_ERR "Multicast filter read/write mismap %d\n",i);
975#endif
976 }
977 ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
978
979 if(dev->flags&IFF_PROMISC)
980 ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
981 else if(dev->flags&IFF_ALLMULTI || dev->mc_list)
982 ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
983 else
984 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
985 }
986
987/*
988 * Called without lock held. This is invoked from user context and may
989 * be parallel to just about everything else. Its also fairly quick and
990 * not called too often. Must protect against both bh and irq users
991 */
992
993static void set_multicast_list(struct net_device *dev)
994{
995 unsigned long flags;
996 struct ei_device *ei_local = (struct ei_device*)netdev_priv(dev);
997
998 spin_lock_irqsave(&ei_local->page_lock, flags);
999 do_set_multicast_list(dev);
1000 spin_unlock_irqrestore(&ei_local->page_lock, flags);
1001}
1002
1003/**
1004 * ethdev_setup - init rest of 8390 device struct
1005 * @dev: network device structure to init
1006 *
1007 * Initialize the rest of the 8390 device structure. Do NOT __init
1008 * this, as it is used by 8390 based modular drivers too.
1009 */
1010
1011static void ethdev_setup(struct net_device *dev)
1012{
1013 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
1014 if (ei_debug > 1)
1015 printk(version);
1016
1017 dev->hard_start_xmit = &ei_start_xmit;
1018 dev->get_stats = get_stats;
1019 dev->set_multicast_list = &set_multicast_list;
1020
1021 ether_setup(dev);
1022
1023 spin_lock_init(&ei_local->page_lock);
1024}
1025
1026/**
1027 * alloc_ei_netdev - alloc_etherdev counterpart for 8390
1028 * @size: extra bytes to allocate
1029 *
1030 * Allocate 8390-specific net_device.
1031 */
1032static struct net_device *____alloc_ei_netdev(int size)
1033{
1034 return alloc_netdev(sizeof(struct ei_device) + size, "eth%d",
1035 ethdev_setup);
1036}
1037
1038
1039
1040
1041/* This page of functions should be 8390 generic */
1042/* Follow National Semi's recommendations for initializing the "NIC". */
1043
1044/**
1045 * NS8390_init - initialize 8390 hardware
1046 * @dev: network device to initialize
1047 * @startp: boolean. non-zero value to initiate chip processing
1048 *
1049 * Must be called with lock held.
1050 */
1051
1052static void __NS8390_init(struct net_device *dev, int startp)
1053{
1054 unsigned long e8390_base = dev->base_addr;
1055 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
1056 int i;
1057 int endcfg = ei_local->word16
1058 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
1059 : 0x48;
1060
1061 if(sizeof(struct e8390_pkt_hdr)!=4)
1062 panic("8390.c: header struct mispacked\n");
1063 /* Follow National Semi's recommendations for initing the DP83902. */
1064 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1065 ei_outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */
1066 /* Clear the remote byte count registers. */
1067 ei_outb_p(0x00, e8390_base + EN0_RCNTLO);
1068 ei_outb_p(0x00, e8390_base + EN0_RCNTHI);
1069 /* Set to monitor and loopback mode -- this is vital!. */
1070 ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
1071 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1072 /* Set the transmit page and receive ring. */
1073 ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1074 ei_local->tx1 = ei_local->tx2 = 0;
1075 ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1076 ei_outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/
1077 ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */
1078 ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1079 /* Clear the pending interrupts and mask. */
1080 ei_outb_p(0xFF, e8390_base + EN0_ISR);
1081 ei_outb_p(0x00, e8390_base + EN0_IMR);
1082
1083 /* Copy the station address into the DS8390 registers. */
1084
1085 ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1086 for(i = 0; i < 6; i++)
1087 {
1088 ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1089 if (ei_debug > 1 && ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1090 printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
1091 }
1092
1093 ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1094 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1095
1096 netif_start_queue(dev);
1097 ei_local->tx1 = ei_local->tx2 = 0;
1098 ei_local->txing = 0;
1099
1100 if (startp)
1101 {
1102 ei_outb_p(0xff, e8390_base + EN0_ISR);
1103 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1104 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1105 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
1106 /* 3c503 TechMan says rxconfig only after the NIC is started. */
1107 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */
1108 do_set_multicast_list(dev); /* (re)load the mcast table */
1109 }
1110}
1111
1112/* Trigger a transmit start, assuming the length is valid.
1113 Always called with the page lock held */
1114
1115static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1116 int start_page)
1117{
1118 unsigned long e8390_base = dev->base_addr;
1119 struct ei_device *ei_local __attribute((unused)) = (struct ei_device *) netdev_priv(dev);
1120
1121 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
1122
1123 if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS)
1124 {
1125 printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
1126 dev->name);
1127 return;
1128 }
1129 ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1130 ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1131 ei_outb_p(start_page, e8390_base + EN0_TPSR);
1132 ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1133}