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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 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.
146 */
147
148
149
150/**
151 * ei_open - Open/initialize the board.
152 * @dev: network device to initialize
153 *
154 * This routine goes all-out, setting everything
155 * up anew at each open, even though many of these registers should only
156 * need to be set once at boot.
157 */
158static int __ei_open(struct net_device *dev)
159{
160 unsigned long flags;
161 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
162
163 /* The card I/O part of the driver (e.g. 3c503) can hook a Tx timeout
164 wrapper that does e.g. media check & then calls ei_tx_timeout. */
165 if (dev->tx_timeout == NULL)
166 dev->tx_timeout = ei_tx_timeout;
167 if (dev->watchdog_timeo <= 0)
168 dev->watchdog_timeo = TX_TIMEOUT;
169
170 /*
171 * Grab the page lock so we own the register set, then call
172 * the init function.
173 */
174
175 spin_lock_irqsave(&ei_local->page_lock, flags);
176 __NS8390_init(dev, 1);
177 /* Set the flag before we drop the lock, That way the IRQ arrives
178 after its set and we get no silly warnings */
179 netif_start_queue(dev);
180 spin_unlock_irqrestore(&ei_local->page_lock, flags);
181 ei_local->irqlock = 0;
182 return 0;
183}
184
185/**
186 * ei_close - shut down network device
187 * @dev: network device to close
188 *
189 * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
190 */
191static int __ei_close(struct net_device *dev)
192{
193 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
194 unsigned long flags;
195
196 /*
197 * Hold the page lock during close
198 */
199
200 spin_lock_irqsave(&ei_local->page_lock, flags);
201 __NS8390_init(dev, 0);
202 spin_unlock_irqrestore(&ei_local->page_lock, flags);
203 netif_stop_queue(dev);
204 return 0;
205}
206
207/**
208 * ei_tx_timeout - handle transmit time out condition
209 * @dev: network device which has apparently fallen asleep
210 *
211 * Called by kernel when device never acknowledges a transmit has
212 * completed (or failed) - i.e. never posted a Tx related interrupt.
213 */
214
215static void ei_tx_timeout(struct net_device *dev)
216{
217 unsigned long e8390_base = dev->base_addr;
218 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
219 int txsr, isr, tickssofar = jiffies - dev->trans_start;
220 unsigned long flags;
221
222#if defined(CONFIG_M32R) && defined(CONFIG_SMP)
223 unsigned long icucr;
224
225 local_irq_save(flags);
226 icucr = inl(M32R_ICU_CR1_PORTL);
227 icucr |= M32R_ICUCR_ISMOD11;
228 outl(icucr, M32R_ICU_CR1_PORTL);
229 local_irq_restore(flags);
230#endif
231 ei_local->stat.tx_errors++;
232
233 spin_lock_irqsave(&ei_local->page_lock, flags);
234 txsr = ei_inb(e8390_base+EN0_TSR);
235 isr = ei_inb(e8390_base+EN0_ISR);
236 spin_unlock_irqrestore(&ei_local->page_lock, flags);
237
238 printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
239 dev->name, (txsr & ENTSR_ABT) ? "excess collisions." :
240 (isr) ? "lost interrupt?" : "cable problem?", txsr, isr, tickssofar);
241
242 if (!isr && !ei_local->stat.tx_packets)
243 {
244 /* The 8390 probably hasn't gotten on the cable yet. */
245 ei_local->interface_num ^= 1; /* Try a different xcvr. */
246 }
247
248 /* Ugly but a reset can be slow, yet must be protected */
249
250 disable_irq_nosync_lockdep(dev->irq);
251 spin_lock(&ei_local->page_lock);
252
253 /* Try to restart the card. Perhaps the user has fixed something. */
254 ei_reset_8390(dev);
255 __NS8390_init(dev, 1);
256
257 spin_unlock(&ei_local->page_lock);
258 enable_irq_lockdep(dev->irq);
259 netif_wake_queue(dev);
260}
261
262/**
263 * ei_start_xmit - begin packet transmission
264 * @skb: packet to be sent
265 * @dev: network device to which packet is sent
266 *
267 * Sends a packet to an 8390 network device.
268 */
269
270static int ei_start_xmit(struct sk_buff *skb, struct net_device *dev)
271{
272 unsigned long e8390_base = dev->base_addr;
273 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
274 int send_length = skb->len, output_page;
275 unsigned long flags;
276 char buf[ETH_ZLEN];
277 char *data = skb->data;
278
279 if (skb->len < ETH_ZLEN) {
280 memset(buf, 0, ETH_ZLEN); /* more efficient than doing just the needed bits */
281 memcpy(buf, data, skb->len);
282 send_length = ETH_ZLEN;
283 data = buf;
284 }
285
286 /* Mask interrupts from the ethercard.
287 SMP: We have to grab the lock here otherwise the IRQ handler
288 on another CPU can flip window and race the IRQ mask set. We end
289 up trashing the mcast filter not disabling irqs if we don't lock */
290
291 spin_lock_irqsave(&ei_local->page_lock, flags);
292 ei_outb_p(0x00, e8390_base + EN0_IMR);
293 spin_unlock_irqrestore(&ei_local->page_lock, flags);
294
295
296 /*
297 * Slow phase with lock held.
298 */
299
300 disable_irq_nosync_lockdep_irqsave(dev->irq, &flags);
301
302 spin_lock(&ei_local->page_lock);
303
304 ei_local->irqlock = 1;
305
306 /*
307 * We have two Tx slots available for use. Find the first free
308 * slot, and then perform some sanity checks. With two Tx bufs,
309 * you get very close to transmitting back-to-back packets. With
310 * only one Tx buf, the transmitter sits idle while you reload the
311 * card, leaving a substantial gap between each transmitted packet.
312 */
313
314 if (ei_local->tx1 == 0)
315 {
316 output_page = ei_local->tx_start_page;
317 ei_local->tx1 = send_length;
318 if (ei_debug && ei_local->tx2 > 0)
319 printk(KERN_DEBUG "%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
320 dev->name, ei_local->tx2, ei_local->lasttx, ei_local->txing);
321 }
322 else if (ei_local->tx2 == 0)
323 {
324 output_page = ei_local->tx_start_page + TX_PAGES/2;
325 ei_local->tx2 = send_length;
326 if (ei_debug && ei_local->tx1 > 0)
327 printk(KERN_DEBUG "%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
328 dev->name, ei_local->tx1, ei_local->lasttx, ei_local->txing);
329 }
330 else
331 { /* We should never get here. */
332 if (ei_debug)
333 printk(KERN_DEBUG "%s: No Tx buffers free! tx1=%d tx2=%d last=%d\n",
334 dev->name, ei_local->tx1, ei_local->tx2, ei_local->lasttx);
335 ei_local->irqlock = 0;
336 netif_stop_queue(dev);
337 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
338 spin_unlock(&ei_local->page_lock);
339 enable_irq_lockdep_irqrestore(dev->irq, &flags);
340 ei_local->stat.tx_errors++;
341 return 1;
342 }
343
344 /*
345 * Okay, now upload the packet and trigger a send if the transmitter
346 * isn't already sending. If it is busy, the interrupt handler will
347 * trigger the send later, upon receiving a Tx done interrupt.
348 */
349
350 ei_block_output(dev, send_length, data, output_page);
351
352 if (! ei_local->txing)
353 {
354 ei_local->txing = 1;
355 NS8390_trigger_send(dev, send_length, output_page);
356 dev->trans_start = jiffies;
357 if (output_page == ei_local->tx_start_page)
358 {
359 ei_local->tx1 = -1;
360 ei_local->lasttx = -1;
361 }
362 else
363 {
364 ei_local->tx2 = -1;
365 ei_local->lasttx = -2;
366 }
367 }
368 else ei_local->txqueue++;
369
370 if (ei_local->tx1 && ei_local->tx2)
371 netif_stop_queue(dev);
372 else
373 netif_start_queue(dev);
374
375 /* Turn 8390 interrupts back on. */
376 ei_local->irqlock = 0;
377 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
378
379 spin_unlock(&ei_local->page_lock);
380 enable_irq_lockdep_irqrestore(dev->irq, &flags);
381
382 dev_kfree_skb (skb);
383 ei_local->stat.tx_bytes += send_length;
384
385 return 0;
386}
387
388/**
389 * ei_interrupt - handle the interrupts from an 8390
390 * @irq: interrupt number
391 * @dev_id: a pointer to the net_device
392 *
393 * Handle the ether interface interrupts. We pull packets from
394 * the 8390 via the card specific functions and fire them at the networking
395 * stack. We also handle transmit completions and wake the transmit path if
396 * necessary. We also update the counters and do other housekeeping as
397 * needed.
398 */
399
400static irqreturn_t __ei_interrupt(int irq, void *dev_id)
401{
402 struct net_device *dev = dev_id;
403 unsigned long e8390_base = dev->base_addr;
404 int interrupts, nr_serviced = 0;
405 struct ei_device *ei_local = netdev_priv(dev);
406
407 /*
408 * Protect the irq test too.
409 */
410
411 spin_lock(&ei_local->page_lock);
412
413 if (ei_local->irqlock)
414 {
415#if 1 /* This might just be an interrupt for a PCI device sharing this line */
416 /* The "irqlock" check is only for testing. */
417 printk(ei_local->irqlock
418 ? "%s: Interrupted while interrupts are masked! isr=%#2x imr=%#2x.\n"
419 : "%s: Reentering the interrupt handler! isr=%#2x imr=%#2x.\n",
420 dev->name, ei_inb_p(e8390_base + EN0_ISR),
421 ei_inb_p(e8390_base + EN0_IMR));
422#endif
423 spin_unlock(&ei_local->page_lock);
424 return IRQ_NONE;
425 }
426
427 /* Change to page 0 and read the intr status reg. */
428 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
429 if (ei_debug > 3)
430 printk(KERN_DEBUG "%s: interrupt(isr=%#2.2x).\n", dev->name,
431 ei_inb_p(e8390_base + EN0_ISR));
432
433 /* !!Assumption!! -- we stay in page 0. Don't break this. */
434 while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0
435 && ++nr_serviced < MAX_SERVICE)
436 {
437 if (!netif_running(dev)) {
438 printk(KERN_WARNING "%s: interrupt from stopped card\n", dev->name);
439 /* rmk - acknowledge the interrupts */
440 ei_outb_p(interrupts, e8390_base + EN0_ISR);
441 interrupts = 0;
442 break;
443 }
444 if (interrupts & ENISR_OVER)
445 ei_rx_overrun(dev);
446 else if (interrupts & (ENISR_RX+ENISR_RX_ERR))
447 {
448 /* Got a good (?) packet. */
449 ei_receive(dev);
450 }
451 /* Push the next to-transmit packet through. */
452 if (interrupts & ENISR_TX)
453 ei_tx_intr(dev);
454 else if (interrupts & ENISR_TX_ERR)
455 ei_tx_err(dev);
456
457 if (interrupts & ENISR_COUNTERS)
458 {
459 ei_local->stat.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0);
460 ei_local->stat.rx_crc_errors += ei_inb_p(e8390_base + EN0_COUNTER1);
461 ei_local->stat.rx_missed_errors+= ei_inb_p(e8390_base + EN0_COUNTER2);
462 ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
463 }
464
465 /* Ignore any RDC interrupts that make it back to here. */
466 if (interrupts & ENISR_RDC)
467 {
468 ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR);
469 }
470
471 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
472 }
473
474 if (interrupts && ei_debug)
475 {
476 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
477 if (nr_serviced >= MAX_SERVICE)
478 {
479 /* 0xFF is valid for a card removal */
480 if(interrupts!=0xFF)
481 printk(KERN_WARNING "%s: Too much work at interrupt, status %#2.2x\n",
482 dev->name, interrupts);
483 ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
484 } else {
485 printk(KERN_WARNING "%s: unknown interrupt %#2x\n", dev->name, interrupts);
486 ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
487 }
488 }
489 spin_unlock(&ei_local->page_lock);
490 return IRQ_RETVAL(nr_serviced > 0);
491}
492
493#ifdef CONFIG_NET_POLL_CONTROLLER
494static void __ei_poll(struct net_device *dev)
495{
496 disable_irq_lockdep(dev->irq);
497 __ei_interrupt(dev->irq, dev);
498 enable_irq_lockdep(dev->irq);
499}
500#endif
501
502/**
503 * ei_tx_err - handle transmitter error
504 * @dev: network device which threw the exception
505 *
506 * A transmitter error has happened. Most likely excess collisions (which
507 * is a fairly normal condition). If the error is one where the Tx will
508 * have been aborted, we try and send another one right away, instead of
509 * letting the failed packet sit and collect dust in the Tx buffer. This
510 * is a much better solution as it avoids kernel based Tx timeouts, and
511 * an unnecessary card reset.
512 *
513 * Called with lock held.
514 */
515
516static void ei_tx_err(struct net_device *dev)
517{
518 unsigned long e8390_base = dev->base_addr;
519 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
520 unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR);
521 unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
522
523#ifdef VERBOSE_ERROR_DUMP
524 printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
525 if (txsr & ENTSR_ABT)
526 printk("excess-collisions ");
527 if (txsr & ENTSR_ND)
528 printk("non-deferral ");
529 if (txsr & ENTSR_CRS)
530 printk("lost-carrier ");
531 if (txsr & ENTSR_FU)
532 printk("FIFO-underrun ");
533 if (txsr & ENTSR_CDH)
534 printk("lost-heartbeat ");
535 printk("\n");
536#endif
537
538 ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
539
540 if (tx_was_aborted)
541 ei_tx_intr(dev);
542 else
543 {
544 ei_local->stat.tx_errors++;
545 if (txsr & ENTSR_CRS) ei_local->stat.tx_carrier_errors++;
546 if (txsr & ENTSR_CDH) ei_local->stat.tx_heartbeat_errors++;
547 if (txsr & ENTSR_OWC) ei_local->stat.tx_window_errors++;
548 }
549}
550
551/**
552 * ei_tx_intr - transmit interrupt handler
553 * @dev: network device for which tx intr is handled
554 *
555 * We have finished a transmit: check for errors and then trigger the next
556 * packet to be sent. Called with lock held.
557 */
558
559static void ei_tx_intr(struct net_device *dev)
560{
561 unsigned long e8390_base = dev->base_addr;
562 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
563 int status = ei_inb(e8390_base + EN0_TSR);
564
565 ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
566
567 /*
568 * There are two Tx buffers, see which one finished, and trigger
569 * the send of another one if it exists.
570 */
571 ei_local->txqueue--;
572
573 if (ei_local->tx1 < 0)
574 {
575 if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
576 printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
577 ei_local->name, ei_local->lasttx, ei_local->tx1);
578 ei_local->tx1 = 0;
579 if (ei_local->tx2 > 0)
580 {
581 ei_local->txing = 1;
582 NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
583 dev->trans_start = jiffies;
584 ei_local->tx2 = -1,
585 ei_local->lasttx = 2;
586 }
587 else ei_local->lasttx = 20, ei_local->txing = 0;
588 }
589 else if (ei_local->tx2 < 0)
590 {
591 if (ei_local->lasttx != 2 && ei_local->lasttx != -2)
592 printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
593 ei_local->name, ei_local->lasttx, ei_local->tx2);
594 ei_local->tx2 = 0;
595 if (ei_local->tx1 > 0)
596 {
597 ei_local->txing = 1;
598 NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
599 dev->trans_start = jiffies;
600 ei_local->tx1 = -1;
601 ei_local->lasttx = 1;
602 }
603 else
604 ei_local->lasttx = 10, ei_local->txing = 0;
605 }
606// else printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
607// dev->name, ei_local->lasttx);
608
609 /* Minimize Tx latency: update the statistics after we restart TXing. */
610 if (status & ENTSR_COL)
611 ei_local->stat.collisions++;
612 if (status & ENTSR_PTX)
613 ei_local->stat.tx_packets++;
614 else
615 {
616 ei_local->stat.tx_errors++;
617 if (status & ENTSR_ABT)
618 {
619 ei_local->stat.tx_aborted_errors++;
620 ei_local->stat.collisions += 16;
621 }
622 if (status & ENTSR_CRS)
623 ei_local->stat.tx_carrier_errors++;
624 if (status & ENTSR_FU)
625 ei_local->stat.tx_fifo_errors++;
626 if (status & ENTSR_CDH)
627 ei_local->stat.tx_heartbeat_errors++;
628 if (status & ENTSR_OWC)
629 ei_local->stat.tx_window_errors++;
630 }
631 netif_wake_queue(dev);
632}
633
634/**
635 * ei_receive - receive some packets
636 * @dev: network device with which receive will be run
637 *
638 * We have a good packet(s), get it/them out of the buffers.
639 * Called with lock held.
640 */
641
642static void ei_receive(struct net_device *dev)
643{
644 unsigned long e8390_base = dev->base_addr;
645 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
646 unsigned char rxing_page, this_frame, next_frame;
647 unsigned short current_offset;
648 int rx_pkt_count = 0;
649 struct e8390_pkt_hdr rx_frame;
650 int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
651
652 while (++rx_pkt_count < 10)
653 {
654 int pkt_len, pkt_stat;
655
656 /* Get the rx page (incoming packet pointer). */
657 ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
658 rxing_page = ei_inb_p(e8390_base + EN1_CURPAG);
659 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
660
661 /* Remove one frame from the ring. Boundary is always a page behind. */
662 this_frame = ei_inb_p(e8390_base + EN0_BOUNDARY) + 1;
663 if (this_frame >= ei_local->stop_page)
664 this_frame = ei_local->rx_start_page;
665
666 /* Someday we'll omit the previous, iff we never get this message.
667 (There is at least one clone claimed to have a problem.)
668
669 Keep quiet if it looks like a card removal. One problem here
670 is that some clones crash in roughly the same way.
671 */
672 if (ei_debug > 0 && this_frame != ei_local->current_page && (this_frame!=0x0 || rxing_page!=0xFF))
673 printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
674 dev->name, this_frame, ei_local->current_page);
675
676 if (this_frame == rxing_page) /* Read all the frames? */
677 break; /* Done for now */
678
679 current_offset = this_frame << 8;
680 ei_get_8390_hdr(dev, &rx_frame, this_frame);
681
682 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
683 pkt_stat = rx_frame.status;
684
685 next_frame = this_frame + 1 + ((pkt_len+4)>>8);
686
687 /* Check for bogosity warned by 3c503 book: the status byte is never
688 written. This happened a lot during testing! This code should be
689 cleaned up someday. */
690 if (rx_frame.next != next_frame
691 && rx_frame.next != next_frame + 1
692 && rx_frame.next != next_frame - num_rx_pages
693 && rx_frame.next != next_frame + 1 - num_rx_pages) {
694 ei_local->current_page = rxing_page;
695 ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
696 ei_local->stat.rx_errors++;
697 continue;
698 }
699
700 if (pkt_len < 60 || pkt_len > 1518)
701 {
702 if (ei_debug)
703 printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
704 dev->name, rx_frame.count, rx_frame.status,
705 rx_frame.next);
706 ei_local->stat.rx_errors++;
707 ei_local->stat.rx_length_errors++;
708 }
709 else if ((pkt_stat & 0x0F) == ENRSR_RXOK)
710 {
711 struct sk_buff *skb;
712
713 skb = dev_alloc_skb(pkt_len+2);
714 if (skb == NULL)
715 {
716 if (ei_debug > 1)
717 printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
718 dev->name, pkt_len);
719 ei_local->stat.rx_dropped++;
720 break;
721 }
722 else
723 {
724 skb_reserve(skb,2); /* IP headers on 16 byte boundaries */
725 skb->dev = dev;
726 skb_put(skb, pkt_len); /* Make room */
727 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
728 skb->protocol=eth_type_trans(skb,dev);
729 netif_rx(skb);
730 dev->last_rx = jiffies;
731 ei_local->stat.rx_packets++;
732 ei_local->stat.rx_bytes += pkt_len;
733 if (pkt_stat & ENRSR_PHY)
734 ei_local->stat.multicast++;
735 }
736 }
737 else
738 {
739 if (ei_debug)
740 printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
741 dev->name, rx_frame.status, rx_frame.next,
742 rx_frame.count);
743 ei_local->stat.rx_errors++;
744 /* NB: The NIC counts CRC, frame and missed errors. */
745 if (pkt_stat & ENRSR_FO)
746 ei_local->stat.rx_fifo_errors++;
747 }
748 next_frame = rx_frame.next;
749
750 /* This _should_ never happen: it's here for avoiding bad clones. */
751 if (next_frame >= ei_local->stop_page) {
752 printk("%s: next frame inconsistency, %#2x\n", dev->name,
753 next_frame);
754 next_frame = ei_local->rx_start_page;
755 }
756 ei_local->current_page = next_frame;
757 ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
758 }
759
760 /* We used to also ack ENISR_OVER here, but that would sometimes mask
761 a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
762 ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
763 return;
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 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
784
785 /*
786 * Record whether a Tx was in progress and then issue the
787 * stop command.
788 */
789 was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
790 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
791
792 if (ei_debug > 1)
793 printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
794 ei_local->stat.rx_over_errors++;
795
796 /*
797 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
798 * Early datasheets said to poll the reset bit, but now they say that
799 * it "is not a reliable indicator and subsequently should be ignored."
800 * We wait at least 10ms.
801 */
802
803 mdelay(10);
804
805 /*
806 * Reset RBCR[01] back to zero as per magic incantation.
807 */
808 ei_outb_p(0x00, e8390_base+EN0_RCNTLO);
809 ei_outb_p(0x00, e8390_base+EN0_RCNTHI);
810
811 /*
812 * See if any Tx was interrupted or not. According to NS, this
813 * step is vital, and skipping it will cause no end of havoc.
814 */
815
816 if (was_txing)
817 {
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 *get_stats(struct net_device *dev)
849{
850 unsigned long ioaddr = dev->base_addr;
851 struct ei_device *ei_local = (struct ei_device *) 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 &ei_local->stat;
857
858 spin_lock_irqsave(&ei_local->page_lock,flags);
859 /* Read the counter registers, assuming we are in page 0. */
860 ei_local->stat.rx_frame_errors += ei_inb_p(ioaddr + EN0_COUNTER0);
861 ei_local->stat.rx_crc_errors += ei_inb_p(ioaddr + EN0_COUNTER1);
862 ei_local->stat.rx_missed_errors+= ei_inb_p(ioaddr + EN0_COUNTER2);
863 spin_unlock_irqrestore(&ei_local->page_lock, flags);
864
865 return &ei_local->stat;
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 dev_mc_list *dmi;
876
877 for (dmi=dev->mc_list; dmi; dmi=dmi->next)
878 {
879 u32 crc;
880 if (dmi->dmi_addrlen != ETH_ALEN)
881 {
882 printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
883 continue;
884 }
885 crc = ether_crc(ETH_ALEN, dmi->dmi_addr);
886 /*
887 * The 8390 uses the 6 most significant bits of the
888 * CRC to index the multicast table.
889 */
890 bits[crc>>29] |= (1<<((crc>>26)&7));
891 }
892}
893
894/**
895 * do_set_multicast_list - set/clear multicast filter
896 * @dev: net device for which multicast filter is adjusted
897 *
898 * Set or clear the multicast filter for this adaptor. May be called
899 * from a BH in 2.1.x. Must be called with lock held.
900 */
901
902static void do_set_multicast_list(struct net_device *dev)
903{
904 unsigned long e8390_base = dev->base_addr;
905 int i;
906 struct ei_device *ei_local = (struct ei_device*)netdev_priv(dev);
907
908 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI)))
909 {
910 memset(ei_local->mcfilter, 0, 8);
911 if (dev->mc_list)
912 make_mc_bits(ei_local->mcfilter, dev);
913 }
914 else
915 memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */
916
917 /*
918 * DP8390 manuals don't specify any magic sequence for altering
919 * the multicast regs on an already running card. To be safe, we
920 * ensure multicast mode is off prior to loading up the new hash
921 * table. If this proves to be not enough, we can always resort
922 * to stopping the NIC, loading the table and then restarting.
923 *
924 * Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC
925 * Elite16) appear to be write-only. The NS 8390 data sheet lists
926 * them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and
927 * Ultra32 EISA) appears to have this bug fixed.
928 */
929
930 if (netif_running(dev))
931 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
932 ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
933 for(i = 0; i < 8; i++)
934 {
935 ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
936#ifndef BUG_83C690
937 if(ei_inb_p(e8390_base + EN1_MULT_SHIFT(i))!=ei_local->mcfilter[i])
938 printk(KERN_ERR "Multicast filter read/write mismap %d\n",i);
939#endif
940 }
941 ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
942
943 if(dev->flags&IFF_PROMISC)
944 ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
945 else if(dev->flags&IFF_ALLMULTI || dev->mc_list)
946 ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
947 else
948 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
949 }
950
951/*
952 * Called without lock held. This is invoked from user context and may
953 * be parallel to just about everything else. Its also fairly quick and
954 * not called too often. Must protect against both bh and irq users
955 */
956
957static void set_multicast_list(struct net_device *dev)
958{
959 unsigned long flags;
960 struct ei_device *ei_local = (struct ei_device*)netdev_priv(dev);
961
962 spin_lock_irqsave(&ei_local->page_lock, flags);
963 do_set_multicast_list(dev);
964 spin_unlock_irqrestore(&ei_local->page_lock, flags);
965}
966
967/**
968 * ethdev_setup - init rest of 8390 device struct
969 * @dev: network device structure to init
970 *
971 * Initialize the rest of the 8390 device structure. Do NOT __init
972 * this, as it is used by 8390 based modular drivers too.
973 */
974
975static void ethdev_setup(struct net_device *dev)
976{
977 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
978 if (ei_debug > 1)
979 printk(version);
980
981 dev->hard_start_xmit = &ei_start_xmit;
982 dev->get_stats = get_stats;
983 dev->set_multicast_list = &set_multicast_list;
984
985 ether_setup(dev);
986
987 spin_lock_init(&ei_local->page_lock);
988}
989
990/**
991 * alloc_ei_netdev - alloc_etherdev counterpart for 8390
992 * @size: extra bytes to allocate
993 *
994 * Allocate 8390-specific net_device.
995 */
996static struct net_device *____alloc_ei_netdev(int size)
997{
998 return alloc_netdev(sizeof(struct ei_device) + size, "eth%d",
999 ethdev_setup);
1000}
1001
1002
1003
1004
1005/* This page of functions should be 8390 generic */
1006/* Follow National Semi's recommendations for initializing the "NIC". */
1007
1008/**
1009 * NS8390_init - initialize 8390 hardware
1010 * @dev: network device to initialize
1011 * @startp: boolean. non-zero value to initiate chip processing
1012 *
1013 * Must be called with lock held.
1014 */
1015
1016static void __NS8390_init(struct net_device *dev, int startp)
1017{
1018 unsigned long e8390_base = dev->base_addr;
1019 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
1020 int i;
1021 int endcfg = ei_local->word16
1022 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
1023 : 0x48;
1024
1025 if(sizeof(struct e8390_pkt_hdr)!=4)
1026 panic("8390.c: header struct mispacked\n");
1027 /* Follow National Semi's recommendations for initing the DP83902. */
1028 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1029 ei_outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */
1030 /* Clear the remote byte count registers. */
1031 ei_outb_p(0x00, e8390_base + EN0_RCNTLO);
1032 ei_outb_p(0x00, e8390_base + EN0_RCNTHI);
1033 /* Set to monitor and loopback mode -- this is vital!. */
1034 ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
1035 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1036 /* Set the transmit page and receive ring. */
1037 ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1038 ei_local->tx1 = ei_local->tx2 = 0;
1039 ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1040 ei_outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/
1041 ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */
1042 ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1043 /* Clear the pending interrupts and mask. */
1044 ei_outb_p(0xFF, e8390_base + EN0_ISR);
1045 ei_outb_p(0x00, e8390_base + EN0_IMR);
1046
1047 /* Copy the station address into the DS8390 registers. */
1048
1049 ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1050 for(i = 0; i < 6; i++)
1051 {
1052 ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1053 if (ei_debug > 1 && ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1054 printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
1055 }
1056
1057 ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1058 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1059
1060 netif_start_queue(dev);
1061 ei_local->tx1 = ei_local->tx2 = 0;
1062 ei_local->txing = 0;
1063
1064 if (startp)
1065 {
1066 ei_outb_p(0xff, e8390_base + EN0_ISR);
1067 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1068 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1069 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
1070 /* 3c503 TechMan says rxconfig only after the NIC is started. */
1071 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */
1072 do_set_multicast_list(dev); /* (re)load the mcast table */
1073 }
1074}
1075
1076/* Trigger a transmit start, assuming the length is valid.
1077 Always called with the page lock held */
1078
1079static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1080 int start_page)
1081{
1082 unsigned long e8390_base = dev->base_addr;
1083 struct ei_device *ei_local __attribute((unused)) = (struct ei_device *) netdev_priv(dev);
1084
1085 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
1086
1087 if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS)
1088 {
1089 printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
1090 dev->name);
1091 return;
1092 }
1093 ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1094 ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1095 ei_outb_p(start_page, e8390_base + EN0_TPSR);
1096 ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1097}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-16 06:11:13 -0500