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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 arbitrary 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 <linux/uaccess.h>
62#include <linux/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_receive(struct net_device *dev);
112static void ei_rx_overrun(struct net_device *dev);
113
114/* Routines generic to NS8390-based boards. */
115static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
116 int start_page);
117static void do_set_multicast_list(struct net_device *dev);
118static void __NS8390_init(struct net_device *dev, int startp);
119
120/*
121 * SMP and the 8390 setup.
122 *
123 * The 8390 isn't exactly designed to be multithreaded on RX/TX. There is
124 * a page register that controls bank and packet buffer access. We guard
125 * this with ei_local->page_lock. Nobody should assume or set the page other
126 * than zero when the lock is not held. Lock holders must restore page 0
127 * before unlocking. Even pure readers must take the lock to protect in
128 * page 0.
129 *
130 * To make life difficult the chip can also be very slow. We therefore can't
131 * just use spinlocks. For the longer lockups we disable the irq the device
132 * sits on and hold the lock. We must hold the lock because there is a dual
133 * processor case other than interrupts (get stats/set multicast list in
134 * parallel with each other and transmit).
135 *
136 * Note: in theory we can just disable the irq on the card _but_ there is
137 * a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
138 * enter lock, take the queued irq. So we waddle instead of flying.
139 *
140 * Finally by special arrangement for the purpose of being generally
141 * annoying the transmit function is called bh atomic. That places
142 * restrictions on the user context callers as disable_irq won't save
143 * them.
144 *
145 * Additional explanation of problems with locking by Alan Cox:
146 *
147 * "The author (me) didn't use spin_lock_irqsave because the slowness of the
148 * card means that approach caused horrible problems like losing serial data
149 * at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA
150 * chips with FPGA front ends.
151 *
152 * Ok the logic behind the 8390 is very simple:
153 *
154 * Things to know
155 * - IRQ delivery is asynchronous to the PCI bus
156 * - Blocking the local CPU IRQ via spin locks was too slow
157 * - The chip has register windows needing locking work
158 *
159 * So the path was once (I say once as people appear to have changed it
160 * in the mean time and it now looks rather bogus if the changes to use
161 * disable_irq_nosync_irqsave are disabling the local IRQ)
162 *
163 *
164 * Take the page lock
165 * Mask the IRQ on chip
166 * Disable the IRQ (but not mask locally- someone seems to have
167 * broken this with the lock validator stuff)
168 * [This must be _nosync as the page lock may otherwise
169 * deadlock us]
170 * Drop the page lock and turn IRQs back on
171 *
172 * At this point an existing IRQ may still be running but we can't
173 * get a new one
174 *
175 * Take the lock (so we know the IRQ has terminated) but don't mask
176 * the IRQs on the processor
177 * Set irqlock [for debug]
178 *
179 * Transmit (slow as ****)
180 *
181 * re-enable the IRQ
182 *
183 *
184 * We have to use disable_irq because otherwise you will get delayed
185 * interrupts on the APIC bus deadlocking the transmit path.
186 *
187 * Quite hairy but the chip simply wasn't designed for SMP and you can't
188 * even ACK an interrupt without risking corrupting other parallel
189 * activities on the chip." [lkml, 25 Jul 2007]
190 */
191
192
193
194/**
195 * ei_open - Open/initialize the board.
196 * @dev: network device to initialize
197 *
198 * This routine goes all-out, setting everything
199 * up anew at each open, even though many of these registers should only
200 * need to be set once at boot.
201 */
202static int __ei_open(struct net_device *dev)
203{
204 unsigned long flags;
205 struct ei_device *ei_local = netdev_priv(dev);
206
207 if (dev->watchdog_timeo <= 0)
208 dev->watchdog_timeo = TX_TIMEOUT;
209
210 /*
211 * Grab the page lock so we own the register set, then call
212 * the init function.
213 */
214
215 spin_lock_irqsave(&ei_local->page_lock, flags);
216 __NS8390_init(dev, 1);
217 /* Set the flag before we drop the lock, That way the IRQ arrives
218 after its set and we get no silly warnings */
219 netif_start_queue(dev);
220 spin_unlock_irqrestore(&ei_local->page_lock, flags);
221 ei_local->irqlock = 0;
222 return 0;
223}
224
225/**
226 * ei_close - shut down network device
227 * @dev: network device to close
228 *
229 * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
230 */
231static int __ei_close(struct net_device *dev)
232{
233 struct ei_device *ei_local = netdev_priv(dev);
234 unsigned long flags;
235
236 /*
237 * Hold the page lock during close
238 */
239
240 spin_lock_irqsave(&ei_local->page_lock, flags);
241 __NS8390_init(dev, 0);
242 spin_unlock_irqrestore(&ei_local->page_lock, flags);
243 netif_stop_queue(dev);
244 return 0;
245}
246
247/**
248 * ei_tx_timeout - handle transmit time out condition
249 * @dev: network device which has apparently fallen asleep
250 *
251 * Called by kernel when device never acknowledges a transmit has
252 * completed (or failed) - i.e. never posted a Tx related interrupt.
253 */
254
255static void __ei_tx_timeout(struct net_device *dev)
256{
257 unsigned long e8390_base = dev->base_addr;
258 struct ei_device *ei_local = netdev_priv(dev);
259 int txsr, isr, tickssofar = jiffies - dev_trans_start(dev);
260 unsigned long flags;
261
262 dev->stats.tx_errors++;
263
264 spin_lock_irqsave(&ei_local->page_lock, flags);
265 txsr = ei_inb(e8390_base+EN0_TSR);
266 isr = ei_inb(e8390_base+EN0_ISR);
267 spin_unlock_irqrestore(&ei_local->page_lock, flags);
268
269 netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d\n",
270 (txsr & ENTSR_ABT) ? "excess collisions." :
271 (isr) ? "lost interrupt?" : "cable problem?",
272 txsr, isr, tickssofar);
273
274 if (!isr && !dev->stats.tx_packets) {
275 /* The 8390 probably hasn't gotten on the cable yet. */
276 ei_local->interface_num ^= 1; /* Try a different xcvr. */
277 }
278
279 /* Ugly but a reset can be slow, yet must be protected */
280
281 disable_irq_nosync_lockdep(dev->irq);
282 spin_lock(&ei_local->page_lock);
283
284 /* Try to restart the card. Perhaps the user has fixed something. */
285 ei_reset_8390(dev);
286 __NS8390_init(dev, 1);
287
288 spin_unlock(&ei_local->page_lock);
289 enable_irq_lockdep(dev->irq);
290 netif_wake_queue(dev);
291}
292
293/**
294 * ei_start_xmit - begin packet transmission
295 * @skb: packet to be sent
296 * @dev: network device to which packet is sent
297 *
298 * Sends a packet to an 8390 network device.
299 */
300
301static netdev_tx_t __ei_start_xmit(struct sk_buff *skb,
302 struct net_device *dev)
303{
304 unsigned long e8390_base = dev->base_addr;
305 struct ei_device *ei_local = 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 output_page = ei_local->tx_start_page;
348 ei_local->tx1 = send_length;
349 if (ei_debug && ei_local->tx2 > 0)
350 netdev_dbg(dev, "idle transmitter tx2=%d, lasttx=%d, txing=%d\n",
351 ei_local->tx2, ei_local->lasttx, ei_local->txing);
352 } else if (ei_local->tx2 == 0) {
353 output_page = ei_local->tx_start_page + TX_PAGES/2;
354 ei_local->tx2 = send_length;
355 if (ei_debug && ei_local->tx1 > 0)
356 netdev_dbg(dev, "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n",
357 ei_local->tx1, ei_local->lasttx, ei_local->txing);
358 } else { /* We should never get here. */
359 if (ei_debug)
360 netdev_dbg(dev, "No Tx buffers free! tx1=%d tx2=%d last=%d\n",
361 ei_local->tx1, ei_local->tx2, ei_local->lasttx);
362 ei_local->irqlock = 0;
363 netif_stop_queue(dev);
364 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
365 spin_unlock(&ei_local->page_lock);
366 enable_irq_lockdep_irqrestore(dev->irq, &flags);
367 dev->stats.tx_errors++;
368 return NETDEV_TX_BUSY;
369 }
370
371 /*
372 * Okay, now upload the packet and trigger a send if the transmitter
373 * isn't already sending. If it is busy, the interrupt handler will
374 * trigger the send later, upon receiving a Tx done interrupt.
375 */
376
377 ei_block_output(dev, send_length, data, output_page);
378
379 if (!ei_local->txing) {
380 ei_local->txing = 1;
381 NS8390_trigger_send(dev, send_length, output_page);
382 if (output_page == ei_local->tx_start_page) {
383 ei_local->tx1 = -1;
384 ei_local->lasttx = -1;
385 } else {
386 ei_local->tx2 = -1;
387 ei_local->lasttx = -2;
388 }
389 } else
390 ei_local->txqueue++;
391
392 if (ei_local->tx1 && ei_local->tx2)
393 netif_stop_queue(dev);
394 else
395 netif_start_queue(dev);
396
397 /* Turn 8390 interrupts back on. */
398 ei_local->irqlock = 0;
399 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
400
401 spin_unlock(&ei_local->page_lock);
402 enable_irq_lockdep_irqrestore(dev->irq, &flags);
403 skb_tx_timestamp(skb);
404 dev_kfree_skb(skb);
405 dev->stats.tx_bytes += send_length;
406
407 return NETDEV_TX_OK;
408}
409
410/**
411 * ei_interrupt - handle the interrupts from an 8390
412 * @irq: interrupt number
413 * @dev_id: a pointer to the net_device
414 *
415 * Handle the ether interface interrupts. We pull packets from
416 * the 8390 via the card specific functions and fire them at the networking
417 * stack. We also handle transmit completions and wake the transmit path if
418 * necessary. We also update the counters and do other housekeeping as
419 * needed.
420 */
421
422static irqreturn_t __ei_interrupt(int irq, void *dev_id)
423{
424 struct net_device *dev = dev_id;
425 unsigned long e8390_base = dev->base_addr;
426 int interrupts, nr_serviced = 0;
427 struct ei_device *ei_local = netdev_priv(dev);
428
429 /*
430 * Protect the irq test too.
431 */
432
433 spin_lock(&ei_local->page_lock);
434
435 if (ei_local->irqlock) {
436 /*
437 * This might just be an interrupt for a PCI device sharing
438 * this line
439 */
440 netdev_err(dev, "Interrupted while interrupts are masked! isr=%#2x imr=%#2x\n",
441 ei_inb_p(e8390_base + EN0_ISR),
442 ei_inb_p(e8390_base + EN0_IMR));
443 spin_unlock(&ei_local->page_lock);
444 return IRQ_NONE;
445 }
446
447 /* Change to page 0 and read the intr status reg. */
448 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
449 if (ei_debug > 3)
450 netdev_dbg(dev, "interrupt(isr=%#2.2x)\n",
451 ei_inb_p(e8390_base + EN0_ISR));
452
453 /* !!Assumption!! -- we stay in page 0. Don't break this. */
454 while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0 &&
455 ++nr_serviced < MAX_SERVICE) {
456 if (!netif_running(dev)) {
457 netdev_warn(dev, "interrupt from stopped card\n");
458 /* rmk - acknowledge the interrupts */
459 ei_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 /* Got a good (?) packet. */
467 ei_receive(dev);
468 }
469 /* Push the next to-transmit packet through. */
470 if (interrupts & ENISR_TX)
471 ei_tx_intr(dev);
472 else if (interrupts & ENISR_TX_ERR)
473 ei_tx_err(dev);
474
475 if (interrupts & ENISR_COUNTERS) {
476 dev->stats.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0);
477 dev->stats.rx_crc_errors += ei_inb_p(e8390_base + EN0_COUNTER1);
478 dev->stats.rx_missed_errors += ei_inb_p(e8390_base + EN0_COUNTER2);
479 ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
480 }
481
482 /* Ignore any RDC interrupts that make it back to here. */
483 if (interrupts & ENISR_RDC)
484 ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR);
485
486 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
487 }
488
489 if (interrupts && ei_debug) {
490 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
491 if (nr_serviced >= MAX_SERVICE) {
492 /* 0xFF is valid for a card removal */
493 if (interrupts != 0xFF)
494 netdev_warn(dev, "Too much work at interrupt, status %#2.2x\n",
495 interrupts);
496 ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
497 } else {
498 netdev_warn(dev, "unknown interrupt %#2x\n", interrupts);
499 ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
500 }
501 }
502 spin_unlock(&ei_local->page_lock);
503 return IRQ_RETVAL(nr_serviced > 0);
504}
505
506#ifdef CONFIG_NET_POLL_CONTROLLER
507static void __ei_poll(struct net_device *dev)
508{
509 disable_irq(dev->irq);
510 __ei_interrupt(dev->irq, dev);
511 enable_irq(dev->irq);
512}
513#endif
514
515/**
516 * ei_tx_err - handle transmitter error
517 * @dev: network device which threw the exception
518 *
519 * A transmitter error has happened. Most likely excess collisions (which
520 * is a fairly normal condition). If the error is one where the Tx will
521 * have been aborted, we try and send another one right away, instead of
522 * letting the failed packet sit and collect dust in the Tx buffer. This
523 * is a much better solution as it avoids kernel based Tx timeouts, and
524 * an unnecessary card reset.
525 *
526 * Called with lock held.
527 */
528
529static void ei_tx_err(struct net_device *dev)
530{
531 unsigned long e8390_base = dev->base_addr;
532 /* ei_local is used on some platforms via the EI_SHIFT macro */
533 struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
534 unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR);
535 unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
536
537#ifdef VERBOSE_ERROR_DUMP
538 netdev_dbg(dev, "transmitter error (%#2x):", txsr);
539 if (txsr & ENTSR_ABT)
540 pr_cont(" excess-collisions ");
541 if (txsr & ENTSR_ND)
542 pr_cont(" non-deferral ");
543 if (txsr & ENTSR_CRS)
544 pr_cont(" lost-carrier ");
545 if (txsr & ENTSR_FU)
546 pr_cont(" FIFO-underrun ");
547 if (txsr & ENTSR_CDH)
548 pr_cont(" lost-heartbeat ");
549 pr_cont("\n");
550#endif
551
552 ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
553
554 if (tx_was_aborted)
555 ei_tx_intr(dev);
556 else {
557 dev->stats.tx_errors++;
558 if (txsr & ENTSR_CRS)
559 dev->stats.tx_carrier_errors++;
560 if (txsr & ENTSR_CDH)
561 dev->stats.tx_heartbeat_errors++;
562 if (txsr & ENTSR_OWC)
563 dev->stats.tx_window_errors++;
564 }
565}
566
567/**
568 * ei_tx_intr - transmit interrupt handler
569 * @dev: network device for which tx intr is handled
570 *
571 * We have finished a transmit: check for errors and then trigger the next
572 * packet to be sent. Called with lock held.
573 */
574
575static void ei_tx_intr(struct net_device *dev)
576{
577 unsigned long e8390_base = dev->base_addr;
578 struct ei_device *ei_local = netdev_priv(dev);
579 int status = ei_inb(e8390_base + EN0_TSR);
580
581 ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
582
583 /*
584 * There are two Tx buffers, see which one finished, and trigger
585 * the send of another one if it exists.
586 */
587 ei_local->txqueue--;
588
589 if (ei_local->tx1 < 0) {
590 if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
591 pr_err("%s: bogus last_tx_buffer %d, tx1=%d\n",
592 ei_local->name, ei_local->lasttx, ei_local->tx1);
593 ei_local->tx1 = 0;
594 if (ei_local->tx2 > 0) {
595 ei_local->txing = 1;
596 NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
597 dev->trans_start = jiffies;
598 ei_local->tx2 = -1,
599 ei_local->lasttx = 2;
600 } else
601 ei_local->lasttx = 20, ei_local->txing = 0;
602 } else if (ei_local->tx2 < 0) {
603 if (ei_local->lasttx != 2 && ei_local->lasttx != -2)
604 pr_err("%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 ei_local->txing = 1;
609 NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
610 dev->trans_start = jiffies;
611 ei_local->tx1 = -1;
612 ei_local->lasttx = 1;
613 } else
614 ei_local->lasttx = 10, ei_local->txing = 0;
615 } /* else
616 netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n",
617 ei_local->lasttx);
618*/
619
620 /* Minimize Tx latency: update the statistics after we restart TXing. */
621 if (status & ENTSR_COL)
622 dev->stats.collisions++;
623 if (status & ENTSR_PTX)
624 dev->stats.tx_packets++;
625 else {
626 dev->stats.tx_errors++;
627 if (status & ENTSR_ABT) {
628 dev->stats.tx_aborted_errors++;
629 dev->stats.collisions += 16;
630 }
631 if (status & ENTSR_CRS)
632 dev->stats.tx_carrier_errors++;
633 if (status & ENTSR_FU)
634 dev->stats.tx_fifo_errors++;
635 if (status & ENTSR_CDH)
636 dev->stats.tx_heartbeat_errors++;
637 if (status & ENTSR_OWC)
638 dev->stats.tx_window_errors++;
639 }
640 netif_wake_queue(dev);
641}
642
643/**
644 * ei_receive - receive some packets
645 * @dev: network device with which receive will be run
646 *
647 * We have a good packet(s), get it/them out of the buffers.
648 * Called with lock held.
649 */
650
651static void ei_receive(struct net_device *dev)
652{
653 unsigned long e8390_base = dev->base_addr;
654 struct ei_device *ei_local = netdev_priv(dev);
655 unsigned char rxing_page, this_frame, next_frame;
656 unsigned short current_offset;
657 int rx_pkt_count = 0;
658 struct e8390_pkt_hdr rx_frame;
659 int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
660
661 while (++rx_pkt_count < 10) {
662 int pkt_len, pkt_stat;
663
664 /* Get the rx page (incoming packet pointer). */
665 ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
666 rxing_page = ei_inb_p(e8390_base + EN1_CURPAG);
667 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
668
669 /* Remove one frame from the ring. Boundary is always a page behind. */
670 this_frame = ei_inb_p(e8390_base + EN0_BOUNDARY) + 1;
671 if (this_frame >= ei_local->stop_page)
672 this_frame = ei_local->rx_start_page;
673
674 /* Someday we'll omit the previous, iff we never get this message.
675 (There is at least one clone claimed to have a problem.)
676
677 Keep quiet if it looks like a card removal. One problem here
678 is that some clones crash in roughly the same way.
679 */
680 if (ei_debug > 0 &&
681 this_frame != ei_local->current_page &&
682 (this_frame != 0x0 || rxing_page != 0xFF))
683 netdev_err(dev, "mismatched read page pointers %2x vs %2x\n",
684 this_frame, ei_local->current_page);
685
686 if (this_frame == rxing_page) /* Read all the frames? */
687 break; /* Done for now */
688
689 current_offset = this_frame << 8;
690 ei_get_8390_hdr(dev, &rx_frame, this_frame);
691
692 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
693 pkt_stat = rx_frame.status;
694
695 next_frame = this_frame + 1 + ((pkt_len+4)>>8);
696
697 /* Check for bogosity warned by 3c503 book: the status byte is never
698 written. This happened a lot during testing! This code should be
699 cleaned up someday. */
700 if (rx_frame.next != next_frame &&
701 rx_frame.next != next_frame + 1 &&
702 rx_frame.next != next_frame - num_rx_pages &&
703 rx_frame.next != next_frame + 1 - num_rx_pages) {
704 ei_local->current_page = rxing_page;
705 ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
706 dev->stats.rx_errors++;
707 continue;
708 }
709
710 if (pkt_len < 60 || pkt_len > 1518) {
711 if (ei_debug)
712 netdev_dbg(dev, "bogus packet size: %d, status=%#2x nxpg=%#2x\n",
713 rx_frame.count, rx_frame.status,
714 rx_frame.next);
715 dev->stats.rx_errors++;
716 dev->stats.rx_length_errors++;
717 } else if ((pkt_stat & 0x0F) == ENRSR_RXOK) {
718 struct sk_buff *skb;
719
720 skb = dev_alloc_skb(pkt_len+2);
721 if (skb == NULL) {
722 if (ei_debug > 1)
723 netdev_dbg(dev, "Couldn't allocate a sk_buff of size %d\n",
724 pkt_len);
725 dev->stats.rx_dropped++;
726 break;
727 } else {
728 skb_reserve(skb, 2); /* IP headers on 16 byte boundaries */
729 skb_put(skb, pkt_len); /* Make room */
730 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
731 skb->protocol = eth_type_trans(skb, dev);
732 if (!skb_defer_rx_timestamp(skb))
733 netif_rx(skb);
734 dev->stats.rx_packets++;
735 dev->stats.rx_bytes += pkt_len;
736 if (pkt_stat & ENRSR_PHY)
737 dev->stats.multicast++;
738 }
739 } else {
740 if (ei_debug)
741 netdev_dbg(dev, "bogus packet: status=%#2x nxpg=%#2x size=%d\n",
742 rx_frame.status, rx_frame.next,
743 rx_frame.count);
744 dev->stats.rx_errors++;
745 /* NB: The NIC counts CRC, frame and missed errors. */
746 if (pkt_stat & ENRSR_FO)
747 dev->stats.rx_fifo_errors++;
748 }
749 next_frame = rx_frame.next;
750
751 /* This _should_ never happen: it's here for avoiding bad clones. */
752 if (next_frame >= ei_local->stop_page) {
753 netdev_notice(dev, "next frame inconsistency, %#2x\n",
754 next_frame);
755 next_frame = ei_local->rx_start_page;
756 }
757 ei_local->current_page = next_frame;
758 ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
759 }
760
761 /* We used to also ack ENISR_OVER here, but that would sometimes mask
762 a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
763 ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
764}
765
766/**
767 * ei_rx_overrun - handle receiver overrun
768 * @dev: network device which threw exception
769 *
770 * We have a receiver overrun: we have to kick the 8390 to get it started
771 * again. Problem is that you have to kick it exactly as NS prescribes in
772 * the updated datasheets, or "the NIC may act in an unpredictable manner."
773 * This includes causing "the NIC to defer indefinitely when it is stopped
774 * on a busy network." Ugh.
775 * Called with lock held. Don't call this with the interrupts off or your
776 * computer will hate you - it takes 10ms or so.
777 */
778
779static void ei_rx_overrun(struct net_device *dev)
780{
781 unsigned long e8390_base = dev->base_addr;
782 unsigned char was_txing, must_resend = 0;
783 /* ei_local is used on some platforms via the EI_SHIFT macro */
784 struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
785
786 /*
787 * Record whether a Tx was in progress and then issue the
788 * stop command.
789 */
790 was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
791 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
792
793 if (ei_debug > 1)
794 netdev_dbg(dev, "Receiver overrun\n");
795 dev->stats.rx_over_errors++;
796
797 /*
798 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
799 * Early datasheets said to poll the reset bit, but now they say that
800 * it "is not a reliable indicator and subsequently should be ignored."
801 * We wait at least 10ms.
802 */
803
804 mdelay(10);
805
806 /*
807 * Reset RBCR[01] back to zero as per magic incantation.
808 */
809 ei_outb_p(0x00, e8390_base+EN0_RCNTLO);
810 ei_outb_p(0x00, e8390_base+EN0_RCNTHI);
811
812 /*
813 * See if any Tx was interrupted or not. According to NS, this
814 * step is vital, and skipping it will cause no end of havoc.
815 */
816
817 if (was_txing) {
818 unsigned char tx_completed = ei_inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
819 if (!tx_completed)
820 must_resend = 1;
821 }
822
823 /*
824 * Have to enter loopback mode and then restart the NIC before
825 * you are allowed to slurp packets up off the ring.
826 */
827 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
828 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
829
830 /*
831 * Clear the Rx ring of all the debris, and ack the interrupt.
832 */
833 ei_receive(dev);
834 ei_outb_p(ENISR_OVER, e8390_base+EN0_ISR);
835
836 /*
837 * Leave loopback mode, and resend any packet that got stopped.
838 */
839 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR);
840 if (must_resend)
841 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
842}
843
844/*
845 * Collect the stats. This is called unlocked and from several contexts.
846 */
847
848static struct net_device_stats *__ei_get_stats(struct net_device *dev)
849{
850 unsigned long ioaddr = dev->base_addr;
851 struct ei_device *ei_local = netdev_priv(dev);
852 unsigned long flags;
853
854 /* If the card is stopped, just return the present stats. */
855 if (!netif_running(dev))
856 return &dev->stats;
857
858 spin_lock_irqsave(&ei_local->page_lock, flags);
859 /* Read the counter registers, assuming we are in page 0. */
860 dev->stats.rx_frame_errors += ei_inb_p(ioaddr + EN0_COUNTER0);
861 dev->stats.rx_crc_errors += ei_inb_p(ioaddr + EN0_COUNTER1);
862 dev->stats.rx_missed_errors += ei_inb_p(ioaddr + EN0_COUNTER2);
863 spin_unlock_irqrestore(&ei_local->page_lock, flags);
864
865 return &dev->stats;
866}
867
868/*
869 * Form the 64 bit 8390 multicast table from the linked list of addresses
870 * associated with this dev structure.
871 */
872
873static inline void make_mc_bits(u8 *bits, struct net_device *dev)
874{
875 struct netdev_hw_addr *ha;
876
877 netdev_for_each_mc_addr(ha, dev) {
878 u32 crc = ether_crc(ETH_ALEN, ha->addr);
879 /*
880 * The 8390 uses the 6 most significant bits of the
881 * CRC to index the multicast table.
882 */
883 bits[crc>>29] |= (1<<((crc>>26)&7));
884 }
885}
886
887/**
888 * do_set_multicast_list - set/clear multicast filter
889 * @dev: net device for which multicast filter is adjusted
890 *
891 * Set or clear the multicast filter for this adaptor. May be called
892 * from a BH in 2.1.x. Must be called with lock held.
893 */
894
895static void do_set_multicast_list(struct net_device *dev)
896{
897 unsigned long e8390_base = dev->base_addr;
898 int i;
899 struct ei_device *ei_local = netdev_priv(dev);
900
901 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) {
902 memset(ei_local->mcfilter, 0, 8);
903 if (!netdev_mc_empty(dev))
904 make_mc_bits(ei_local->mcfilter, dev);
905 } else
906 memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */
907
908 /*
909 * DP8390 manuals don't specify any magic sequence for altering
910 * the multicast regs on an already running card. To be safe, we
911 * ensure multicast mode is off prior to loading up the new hash
912 * table. If this proves to be not enough, we can always resort
913 * to stopping the NIC, loading the table and then restarting.
914 *
915 * Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC
916 * Elite16) appear to be write-only. The NS 8390 data sheet lists
917 * them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and
918 * Ultra32 EISA) appears to have this bug fixed.
919 */
920
921 if (netif_running(dev))
922 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
923 ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
924 for (i = 0; i < 8; i++) {
925 ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
926#ifndef BUG_83C690
927 if (ei_inb_p(e8390_base + EN1_MULT_SHIFT(i)) != ei_local->mcfilter[i])
928 netdev_err(dev, "Multicast filter read/write mismap %d\n",
929 i);
930#endif
931 }
932 ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
933
934 if (dev->flags&IFF_PROMISC)
935 ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
936 else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev))
937 ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
938 else
939 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
940}
941
942/*
943 * Called without lock held. This is invoked from user context and may
944 * be parallel to just about everything else. Its also fairly quick and
945 * not called too often. Must protect against both bh and irq users
946 */
947
948static void __ei_set_multicast_list(struct net_device *dev)
949{
950 unsigned long flags;
951 struct ei_device *ei_local = netdev_priv(dev);
952
953 spin_lock_irqsave(&ei_local->page_lock, flags);
954 do_set_multicast_list(dev);
955 spin_unlock_irqrestore(&ei_local->page_lock, flags);
956}
957
958/**
959 * ethdev_setup - init rest of 8390 device struct
960 * @dev: network device structure to init
961 *
962 * Initialize the rest of the 8390 device structure. Do NOT __init
963 * this, as it is used by 8390 based modular drivers too.
964 */
965
966static void ethdev_setup(struct net_device *dev)
967{
968 struct ei_device *ei_local = netdev_priv(dev);
969 if (ei_debug > 1)
970 printk(version);
971
972 ether_setup(dev);
973
974 spin_lock_init(&ei_local->page_lock);
975}
976
977/**
978 * alloc_ei_netdev - alloc_etherdev counterpart for 8390
979 * @size: extra bytes to allocate
980 *
981 * Allocate 8390-specific net_device.
982 */
983static struct net_device *____alloc_ei_netdev(int size)
984{
985 return alloc_netdev(sizeof(struct ei_device) + size, "eth%d",
986 ethdev_setup);
987}
988
989
990
991
992/* This page of functions should be 8390 generic */
993/* Follow National Semi's recommendations for initializing the "NIC". */
994
995/**
996 * NS8390_init - initialize 8390 hardware
997 * @dev: network device to initialize
998 * @startp: boolean. non-zero value to initiate chip processing
999 *
1000 * Must be called with lock held.
1001 */
1002
1003static void __NS8390_init(struct net_device *dev, int startp)
1004{
1005 unsigned long e8390_base = dev->base_addr;
1006 struct ei_device *ei_local = netdev_priv(dev);
1007 int i;
1008 int endcfg = ei_local->word16
1009 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
1010 : 0x48;
1011
1012 if (sizeof(struct e8390_pkt_hdr) != 4)
1013 panic("8390.c: header struct mispacked\n");
1014 /* Follow National Semi's recommendations for initing the DP83902. */
1015 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1016 ei_outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */
1017 /* Clear the remote byte count registers. */
1018 ei_outb_p(0x00, e8390_base + EN0_RCNTLO);
1019 ei_outb_p(0x00, e8390_base + EN0_RCNTHI);
1020 /* Set to monitor and loopback mode -- this is vital!. */
1021 ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
1022 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1023 /* Set the transmit page and receive ring. */
1024 ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1025 ei_local->tx1 = ei_local->tx2 = 0;
1026 ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1027 ei_outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/
1028 ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */
1029 ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1030 /* Clear the pending interrupts and mask. */
1031 ei_outb_p(0xFF, e8390_base + EN0_ISR);
1032 ei_outb_p(0x00, e8390_base + EN0_IMR);
1033
1034 /* Copy the station address into the DS8390 registers. */
1035
1036 ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1037 for (i = 0; i < 6; i++) {
1038 ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1039 if (ei_debug > 1 &&
1040 ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i)) != dev->dev_addr[i])
1041 netdev_err(dev, "Hw. address read/write mismap %d\n", i);
1042 }
1043
1044 ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1045 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1046
1047 ei_local->tx1 = ei_local->tx2 = 0;
1048 ei_local->txing = 0;
1049
1050 if (startp) {
1051 ei_outb_p(0xff, e8390_base + EN0_ISR);
1052 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1053 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1054 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
1055 /* 3c503 TechMan says rxconfig only after the NIC is started. */
1056 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */
1057 do_set_multicast_list(dev); /* (re)load the mcast table */
1058 }
1059}
1060
1061/* Trigger a transmit start, assuming the length is valid.
1062 Always called with the page lock held */
1063
1064static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1065 int start_page)
1066{
1067 unsigned long e8390_base = dev->base_addr;
1068 struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev);
1069
1070 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
1071
1072 if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS) {
1073 netdev_warn(dev, "trigger_send() called with the transmitter busy\n");
1074 return;
1075 }
1076 ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1077 ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1078 ei_outb_p(start_page, e8390_base + EN0_TPSR);
1079 ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1080}