1 /* 8390.c: A general NS8390 ethernet driver core for linux. */
3 Written 1992-94 by Donald Becker.
5 Copyright 1993 United States Government as represented by the
6 Director, National Security Agency.
8 This software may be used and distributed according to the terms
9 of the GNU General Public License, incorporated herein by reference.
11 The author may be reached as becker@scyld.com, or C/O
12 Scyld Computing Corporation
13 410 Severn Ave., Suite 210
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.
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
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.
48 The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
52 static const char version[] =
53 "8390.c:v1.10cvs 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
55 #include <linux/module.h>
56 #include <linux/kernel.h>
57 #include <linux/jiffies.h>
59 #include <linux/types.h>
60 #include <linux/string.h>
61 #include <linux/bitops.h>
62 #include <asm/system.h>
63 #include <asm/uaccess.h>
66 #include <linux/delay.h>
67 #include <linux/errno.h>
68 #include <linux/fcntl.h>
70 #include <linux/interrupt.h>
71 #include <linux/init.h>
72 #include <linux/crc32.h>
74 #include <linux/netdevice.h>
75 #include <linux/etherdevice.h>
82 /* These are the operational function interfaces to board-specific
84 void reset_8390(struct net_device *dev)
85 Resets the board associated with DEV, including a hardware reset of
86 the 8390. This is only called when there is a transmit timeout, and
87 it is always followed by 8390_init().
88 void block_output(struct net_device *dev, int count, const unsigned char *buf,
90 Write the COUNT bytes of BUF to the packet buffer at START_PAGE. The
91 "page" value uses the 8390's 256-byte pages.
92 void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page)
93 Read the 4 byte, page aligned 8390 header. *If* there is a
94 subsequent read, it will be of the rest of the packet.
95 void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
96 Read COUNT bytes from the packet buffer into the skb data area. Start
97 reading from RING_OFFSET, the address as the 8390 sees it. This will always
98 follow the read of the 8390 header.
100 #define ei_reset_8390 (ei_local->reset_8390)
101 #define ei_block_output (ei_local->block_output)
102 #define ei_block_input (ei_local->block_input)
103 #define ei_get_8390_hdr (ei_local->get_8390_hdr)
105 /* use 0 for production, 1 for verification, >2 for debug */
110 /* Index to functions. */
111 static void ei_tx_intr(struct net_device *dev);
112 static void ei_tx_err(struct net_device *dev);
113 static void ei_tx_timeout(struct net_device *dev);
114 static void ei_receive(struct net_device *dev);
115 static void ei_rx_overrun(struct net_device *dev);
117 /* Routines generic to NS8390-based boards. */
118 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
120 static void set_multicast_list(struct net_device *dev);
121 static void do_set_multicast_list(struct net_device *dev);
124 * SMP and the 8390 setup.
126 * The 8390 isnt exactly designed to be multithreaded on RX/TX. There is
127 * a page register that controls bank and packet buffer access. We guard
128 * this with ei_local->page_lock. Nobody should assume or set the page other
129 * than zero when the lock is not held. Lock holders must restore page 0
130 * before unlocking. Even pure readers must take the lock to protect in
133 * To make life difficult the chip can also be very slow. We therefore can't
134 * just use spinlocks. For the longer lockups we disable the irq the device
135 * sits on and hold the lock. We must hold the lock because there is a dual
136 * processor case other than interrupts (get stats/set multicast list in
137 * parallel with each other and transmit).
139 * Note: in theory we can just disable the irq on the card _but_ there is
140 * a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
141 * enter lock, take the queued irq. So we waddle instead of flying.
143 * Finally by special arrangement for the purpose of being generally
144 * annoying the transmit function is called bh atomic. That places
145 * restrictions on the user context callers as disable_irq won't save
152 * ei_open - Open/initialize the board.
153 * @dev: network device to initialize
155 * This routine goes all-out, setting everything
156 * up anew at each open, even though many of these registers should only
157 * need to be set once at boot.
159 int ei_open(struct net_device *dev)
162 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
164 /* The card I/O part of the driver (e.g. 3c503) can hook a Tx timeout
165 wrapper that does e.g. media check & then calls ei_tx_timeout. */
166 if (dev->tx_timeout == NULL)
167 dev->tx_timeout = ei_tx_timeout;
168 if (dev->watchdog_timeo <= 0)
169 dev->watchdog_timeo = TX_TIMEOUT;
172 * Grab the page lock so we own the register set, then call
176 spin_lock_irqsave(&ei_local->page_lock, flags);
178 /* Set the flag before we drop the lock, That way the IRQ arrives
179 after its set and we get no silly warnings */
180 netif_start_queue(dev);
181 spin_unlock_irqrestore(&ei_local->page_lock, flags);
182 ei_local->irqlock = 0;
187 * ei_close - shut down network device
188 * @dev: network device to close
190 * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
192 int ei_close(struct net_device *dev)
194 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
198 * Hold the page lock during close
201 spin_lock_irqsave(&ei_local->page_lock, flags);
203 spin_unlock_irqrestore(&ei_local->page_lock, flags);
204 netif_stop_queue(dev);
209 * ei_tx_timeout - handle transmit time out condition
210 * @dev: network device which has apparently fallen asleep
212 * Called by kernel when device never acknowledges a transmit has
213 * completed (or failed) - i.e. never posted a Tx related interrupt.
216 void ei_tx_timeout(struct net_device *dev)
218 long e8390_base = dev->base_addr;
219 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
220 int txsr, isr, tickssofar = jiffies - dev->trans_start;
223 #if defined(CONFIG_M32R) && defined(CONFIG_SMP)
226 local_irq_save(flags);
228 icucr |= M32R_ICUCR_ISMOD11;
230 local_irq_restore(flags);
232 ei_local->stat.tx_errors++;
234 spin_lock_irqsave(&ei_local->page_lock, flags);
235 txsr = inb(e8390_base+EN0_TSR);
236 isr = inb(e8390_base+EN0_ISR);
237 spin_unlock_irqrestore(&ei_local->page_lock, flags);
239 printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
240 dev->name, (txsr & ENTSR_ABT) ? "excess collisions." :
241 (isr) ? "lost interrupt?" : "cable problem?", txsr, isr, tickssofar);
243 if (!isr && !ei_local->stat.tx_packets)
245 /* The 8390 probably hasn't gotten on the cable yet. */
246 ei_local->interface_num ^= 1; /* Try a different xcvr. */
249 /* Ugly but a reset can be slow, yet must be protected */
251 disable_irq_nosync(dev->irq);
252 spin_lock(&ei_local->page_lock);
254 /* Try to restart the card. Perhaps the user has fixed something. */
258 spin_unlock(&ei_local->page_lock);
259 enable_irq(dev->irq);
260 netif_wake_queue(dev);
264 * ei_start_xmit - begin packet transmission
265 * @skb: packet to be sent
266 * @dev: network device to which packet is sent
268 * Sends a packet to an 8390 network device.
271 static int ei_start_xmit(struct sk_buff *skb, struct net_device *dev)
273 long e8390_base = dev->base_addr;
274 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
275 int length, send_length, output_page;
277 char scratch[ETH_ZLEN];
281 /* Mask interrupts from the ethercard.
282 SMP: We have to grab the lock here otherwise the IRQ handler
283 on another CPU can flip window and race the IRQ mask set. We end
284 up trashing the mcast filter not disabling irqs if we don't lock */
286 spin_lock_irqsave(&ei_local->page_lock, flags);
287 outb_p(0x00, e8390_base + EN0_IMR);
288 spin_unlock_irqrestore(&ei_local->page_lock, flags);
292 * Slow phase with lock held.
295 disable_irq_nosync(dev->irq);
297 spin_lock(&ei_local->page_lock);
299 ei_local->irqlock = 1;
301 send_length = ETH_ZLEN < length ? length : ETH_ZLEN;
304 * We have two Tx slots available for use. Find the first free
305 * slot, and then perform some sanity checks. With two Tx bufs,
306 * you get very close to transmitting back-to-back packets. With
307 * only one Tx buf, the transmitter sits idle while you reload the
308 * card, leaving a substantial gap between each transmitted packet.
311 if (ei_local->tx1 == 0)
313 output_page = ei_local->tx_start_page;
314 ei_local->tx1 = send_length;
315 if (ei_debug && ei_local->tx2 > 0)
316 printk(KERN_DEBUG "%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
317 dev->name, ei_local->tx2, ei_local->lasttx, ei_local->txing);
319 else if (ei_local->tx2 == 0)
321 output_page = ei_local->tx_start_page + TX_PAGES/2;
322 ei_local->tx2 = send_length;
323 if (ei_debug && ei_local->tx1 > 0)
324 printk(KERN_DEBUG "%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
325 dev->name, ei_local->tx1, ei_local->lasttx, ei_local->txing);
328 { /* We should never get here. */
330 printk(KERN_DEBUG "%s: No Tx buffers free! tx1=%d tx2=%d last=%d\n",
331 dev->name, ei_local->tx1, ei_local->tx2, ei_local->lasttx);
332 ei_local->irqlock = 0;
333 netif_stop_queue(dev);
334 outb_p(ENISR_ALL, e8390_base + EN0_IMR);
335 spin_unlock(&ei_local->page_lock);
336 enable_irq(dev->irq);
337 ei_local->stat.tx_errors++;
342 * Okay, now upload the packet and trigger a send if the transmitter
343 * isn't already sending. If it is busy, the interrupt handler will
344 * trigger the send later, upon receiving a Tx done interrupt.
347 if (length == send_length)
348 ei_block_output(dev, length, skb->data, output_page);
350 memset(scratch, 0, ETH_ZLEN);
351 memcpy(scratch, skb->data, skb->len);
352 ei_block_output(dev, ETH_ZLEN, scratch, output_page);
355 if (! ei_local->txing)
358 NS8390_trigger_send(dev, send_length, output_page);
359 dev->trans_start = jiffies;
360 if (output_page == ei_local->tx_start_page)
363 ei_local->lasttx = -1;
368 ei_local->lasttx = -2;
371 else ei_local->txqueue++;
373 if (ei_local->tx1 && ei_local->tx2)
374 netif_stop_queue(dev);
376 netif_start_queue(dev);
378 /* Turn 8390 interrupts back on. */
379 ei_local->irqlock = 0;
380 outb_p(ENISR_ALL, e8390_base + EN0_IMR);
382 spin_unlock(&ei_local->page_lock);
383 enable_irq(dev->irq);
386 ei_local->stat.tx_bytes += send_length;
392 * ei_interrupt - handle the interrupts from an 8390
393 * @irq: interrupt number
394 * @dev_id: a pointer to the net_device
397 * Handle the ether interface interrupts. We pull packets from
398 * the 8390 via the card specific functions and fire them at the networking
399 * stack. We also handle transmit completions and wake the transmit path if
400 * necessary. We also update the counters and do other housekeeping as
404 irqreturn_t ei_interrupt(int irq, void *dev_id, struct pt_regs * regs)
406 struct net_device *dev = dev_id;
408 int interrupts, nr_serviced = 0;
409 struct ei_device *ei_local;
413 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
417 e8390_base = dev->base_addr;
418 ei_local = (struct ei_device *) netdev_priv(dev);
421 * Protect the irq test too.
424 spin_lock(&ei_local->page_lock);
426 if (ei_local->irqlock)
428 #if 1 /* This might just be an interrupt for a PCI device sharing this line */
429 /* The "irqlock" check is only for testing. */
430 printk(ei_local->irqlock
431 ? "%s: Interrupted while interrupts are masked! isr=%#2x imr=%#2x.\n"
432 : "%s: Reentering the interrupt handler! isr=%#2x imr=%#2x.\n",
433 dev->name, inb_p(e8390_base + EN0_ISR),
434 inb_p(e8390_base + EN0_IMR));
436 spin_unlock(&ei_local->page_lock);
440 /* Change to page 0 and read the intr status reg. */
441 outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
443 printk(KERN_DEBUG "%s: interrupt(isr=%#2.2x).\n", dev->name,
444 inb_p(e8390_base + EN0_ISR));
446 /* !!Assumption!! -- we stay in page 0. Don't break this. */
447 while ((interrupts = inb_p(e8390_base + EN0_ISR)) != 0
448 && ++nr_serviced < MAX_SERVICE)
450 if (!netif_running(dev)) {
451 printk(KERN_WARNING "%s: interrupt from stopped card\n", dev->name);
452 /* rmk - acknowledge the interrupts */
453 outb_p(interrupts, e8390_base + EN0_ISR);
457 if (interrupts & ENISR_OVER)
459 else if (interrupts & (ENISR_RX+ENISR_RX_ERR))
461 /* Got a good (?) packet. */
464 /* Push the next to-transmit packet through. */
465 if (interrupts & ENISR_TX)
467 else if (interrupts & ENISR_TX_ERR)
470 if (interrupts & ENISR_COUNTERS)
472 ei_local->stat.rx_frame_errors += inb_p(e8390_base + EN0_COUNTER0);
473 ei_local->stat.rx_crc_errors += inb_p(e8390_base + EN0_COUNTER1);
474 ei_local->stat.rx_missed_errors+= inb_p(e8390_base + EN0_COUNTER2);
475 outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
478 /* Ignore any RDC interrupts that make it back to here. */
479 if (interrupts & ENISR_RDC)
481 outb_p(ENISR_RDC, e8390_base + EN0_ISR);
484 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
487 if (interrupts && ei_debug)
489 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
490 if (nr_serviced >= MAX_SERVICE)
492 /* 0xFF is valid for a card removal */
494 printk(KERN_WARNING "%s: Too much work at interrupt, status %#2.2x\n",
495 dev->name, interrupts);
496 outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
498 printk(KERN_WARNING "%s: unknown interrupt %#2x\n", dev->name, interrupts);
499 outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
502 spin_unlock(&ei_local->page_lock);
503 return IRQ_RETVAL(nr_serviced > 0);
506 #ifdef CONFIG_NET_POLL_CONTROLLER
507 void ei_poll(struct net_device *dev)
509 disable_irq(dev->irq);
510 ei_interrupt(dev->irq, dev, NULL);
511 enable_irq(dev->irq);
516 * ei_tx_err - handle transmitter error
517 * @dev: network device which threw the exception
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.
526 * Called with lock held.
529 static void ei_tx_err(struct net_device *dev)
531 long e8390_base = dev->base_addr;
532 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
533 unsigned char txsr = inb_p(e8390_base+EN0_TSR);
534 unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
536 #ifdef VERBOSE_ERROR_DUMP
537 printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
538 if (txsr & ENTSR_ABT)
539 printk("excess-collisions ");
541 printk("non-deferral ");
542 if (txsr & ENTSR_CRS)
543 printk("lost-carrier ");
545 printk("FIFO-underrun ");
546 if (txsr & ENTSR_CDH)
547 printk("lost-heartbeat ");
551 outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
557 ei_local->stat.tx_errors++;
558 if (txsr & ENTSR_CRS) ei_local->stat.tx_carrier_errors++;
559 if (txsr & ENTSR_CDH) ei_local->stat.tx_heartbeat_errors++;
560 if (txsr & ENTSR_OWC) ei_local->stat.tx_window_errors++;
565 * ei_tx_intr - transmit interrupt handler
566 * @dev: network device for which tx intr is handled
568 * We have finished a transmit: check for errors and then trigger the next
569 * packet to be sent. Called with lock held.
572 static void ei_tx_intr(struct net_device *dev)
574 long e8390_base = dev->base_addr;
575 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
576 int status = inb(e8390_base + EN0_TSR);
578 outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
581 * There are two Tx buffers, see which one finished, and trigger
582 * the send of another one if it exists.
586 if (ei_local->tx1 < 0)
588 if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
589 printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
590 ei_local->name, ei_local->lasttx, ei_local->tx1);
592 if (ei_local->tx2 > 0)
595 NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
596 dev->trans_start = jiffies;
598 ei_local->lasttx = 2;
600 else ei_local->lasttx = 20, ei_local->txing = 0;
602 else if (ei_local->tx2 < 0)
604 if (ei_local->lasttx != 2 && ei_local->lasttx != -2)
605 printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
606 ei_local->name, ei_local->lasttx, ei_local->tx2);
608 if (ei_local->tx1 > 0)
611 NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
612 dev->trans_start = jiffies;
614 ei_local->lasttx = 1;
617 ei_local->lasttx = 10, ei_local->txing = 0;
619 // else printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
620 // dev->name, ei_local->lasttx);
622 /* Minimize Tx latency: update the statistics after we restart TXing. */
623 if (status & ENTSR_COL)
624 ei_local->stat.collisions++;
625 if (status & ENTSR_PTX)
626 ei_local->stat.tx_packets++;
629 ei_local->stat.tx_errors++;
630 if (status & ENTSR_ABT)
632 ei_local->stat.tx_aborted_errors++;
633 ei_local->stat.collisions += 16;
635 if (status & ENTSR_CRS)
636 ei_local->stat.tx_carrier_errors++;
637 if (status & ENTSR_FU)
638 ei_local->stat.tx_fifo_errors++;
639 if (status & ENTSR_CDH)
640 ei_local->stat.tx_heartbeat_errors++;
641 if (status & ENTSR_OWC)
642 ei_local->stat.tx_window_errors++;
644 netif_wake_queue(dev);
648 * ei_receive - receive some packets
649 * @dev: network device with which receive will be run
651 * We have a good packet(s), get it/them out of the buffers.
652 * Called with lock held.
655 static void ei_receive(struct net_device *dev)
657 long e8390_base = dev->base_addr;
658 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
659 unsigned char rxing_page, this_frame, next_frame;
660 unsigned short current_offset;
661 int rx_pkt_count = 0;
662 struct e8390_pkt_hdr rx_frame;
663 int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
665 while (++rx_pkt_count < 10)
667 int pkt_len, pkt_stat;
669 /* Get the rx page (incoming packet pointer). */
670 outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
671 rxing_page = inb_p(e8390_base + EN1_CURPAG);
672 outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
674 /* Remove one frame from the ring. Boundary is always a page behind. */
675 this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1;
676 if (this_frame >= ei_local->stop_page)
677 this_frame = ei_local->rx_start_page;
679 /* Someday we'll omit the previous, iff we never get this message.
680 (There is at least one clone claimed to have a problem.)
682 Keep quiet if it looks like a card removal. One problem here
683 is that some clones crash in roughly the same way.
685 if (ei_debug > 0 && this_frame != ei_local->current_page && (this_frame!=0x0 || rxing_page!=0xFF))
686 printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
687 dev->name, this_frame, ei_local->current_page);
689 if (this_frame == rxing_page) /* Read all the frames? */
690 break; /* Done for now */
692 current_offset = this_frame << 8;
693 ei_get_8390_hdr(dev, &rx_frame, this_frame);
695 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
696 pkt_stat = rx_frame.status;
698 next_frame = this_frame + 1 + ((pkt_len+4)>>8);
700 /* Check for bogosity warned by 3c503 book: the status byte is never
701 written. This happened a lot during testing! This code should be
702 cleaned up someday. */
703 if (rx_frame.next != next_frame
704 && rx_frame.next != next_frame + 1
705 && rx_frame.next != next_frame - num_rx_pages
706 && rx_frame.next != next_frame + 1 - num_rx_pages) {
707 ei_local->current_page = rxing_page;
708 outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
709 ei_local->stat.rx_errors++;
713 if (pkt_len < 60 || pkt_len > 1518)
716 printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
717 dev->name, rx_frame.count, rx_frame.status,
719 ei_local->stat.rx_errors++;
720 ei_local->stat.rx_length_errors++;
722 else if ((pkt_stat & 0x0F) == ENRSR_RXOK)
726 skb = dev_alloc_skb(pkt_len+2);
730 printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
732 ei_local->stat.rx_dropped++;
737 skb_reserve(skb,2); /* IP headers on 16 byte boundaries */
739 skb_put(skb, pkt_len); /* Make room */
740 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
741 skb->protocol=eth_type_trans(skb,dev);
743 dev->last_rx = jiffies;
744 ei_local->stat.rx_packets++;
745 ei_local->stat.rx_bytes += pkt_len;
746 if (pkt_stat & ENRSR_PHY)
747 ei_local->stat.multicast++;
753 printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
754 dev->name, rx_frame.status, rx_frame.next,
756 ei_local->stat.rx_errors++;
757 /* NB: The NIC counts CRC, frame and missed errors. */
758 if (pkt_stat & ENRSR_FO)
759 ei_local->stat.rx_fifo_errors++;
761 next_frame = rx_frame.next;
763 /* This _should_ never happen: it's here for avoiding bad clones. */
764 if (next_frame >= ei_local->stop_page) {
765 printk("%s: next frame inconsistency, %#2x\n", dev->name,
767 next_frame = ei_local->rx_start_page;
769 ei_local->current_page = next_frame;
770 outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
773 /* We used to also ack ENISR_OVER here, but that would sometimes mask
774 a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
775 outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
780 * ei_rx_overrun - handle receiver overrun
781 * @dev: network device which threw exception
783 * We have a receiver overrun: we have to kick the 8390 to get it started
784 * again. Problem is that you have to kick it exactly as NS prescribes in
785 * the updated datasheets, or "the NIC may act in an unpredictable manner."
786 * This includes causing "the NIC to defer indefinitely when it is stopped
787 * on a busy network." Ugh.
788 * Called with lock held. Don't call this with the interrupts off or your
789 * computer will hate you - it takes 10ms or so.
792 static void ei_rx_overrun(struct net_device *dev)
794 long e8390_base = dev->base_addr;
795 unsigned char was_txing, must_resend = 0;
796 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
799 * Record whether a Tx was in progress and then issue the
802 was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
803 outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
806 printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
807 ei_local->stat.rx_over_errors++;
810 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
811 * Early datasheets said to poll the reset bit, but now they say that
812 * it "is not a reliable indicator and subsequently should be ignored."
813 * We wait at least 10ms.
819 * Reset RBCR[01] back to zero as per magic incantation.
821 outb_p(0x00, e8390_base+EN0_RCNTLO);
822 outb_p(0x00, e8390_base+EN0_RCNTHI);
825 * See if any Tx was interrupted or not. According to NS, this
826 * step is vital, and skipping it will cause no end of havoc.
831 unsigned char tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
837 * Have to enter loopback mode and then restart the NIC before
838 * you are allowed to slurp packets up off the ring.
840 outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
841 outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
844 * Clear the Rx ring of all the debris, and ack the interrupt.
847 outb_p(ENISR_OVER, e8390_base+EN0_ISR);
850 * Leave loopback mode, and resend any packet that got stopped.
852 outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR);
854 outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
858 * Collect the stats. This is called unlocked and from several contexts.
861 static struct net_device_stats *get_stats(struct net_device *dev)
863 long ioaddr = dev->base_addr;
864 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
867 /* If the card is stopped, just return the present stats. */
868 if (!netif_running(dev))
869 return &ei_local->stat;
871 spin_lock_irqsave(&ei_local->page_lock,flags);
872 /* Read the counter registers, assuming we are in page 0. */
873 ei_local->stat.rx_frame_errors += inb_p(ioaddr + EN0_COUNTER0);
874 ei_local->stat.rx_crc_errors += inb_p(ioaddr + EN0_COUNTER1);
875 ei_local->stat.rx_missed_errors+= inb_p(ioaddr + EN0_COUNTER2);
876 spin_unlock_irqrestore(&ei_local->page_lock, flags);
878 return &ei_local->stat;
882 * Form the 64 bit 8390 multicast table from the linked list of addresses
883 * associated with this dev structure.
886 static inline void make_mc_bits(u8 *bits, struct net_device *dev)
888 struct dev_mc_list *dmi;
890 for (dmi=dev->mc_list; dmi; dmi=dmi->next)
893 if (dmi->dmi_addrlen != ETH_ALEN)
895 printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
898 crc = ether_crc(ETH_ALEN, dmi->dmi_addr);
900 * The 8390 uses the 6 most significant bits of the
901 * CRC to index the multicast table.
903 bits[crc>>29] |= (1<<((crc>>26)&7));
908 * do_set_multicast_list - set/clear multicast filter
909 * @dev: net device for which multicast filter is adjusted
911 * Set or clear the multicast filter for this adaptor. May be called
912 * from a BH in 2.1.x. Must be called with lock held.
915 static void do_set_multicast_list(struct net_device *dev)
917 long e8390_base = dev->base_addr;
919 struct ei_device *ei_local = (struct ei_device*)netdev_priv(dev);
921 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI)))
923 memset(ei_local->mcfilter, 0, 8);
925 make_mc_bits(ei_local->mcfilter, dev);
928 memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */
931 * DP8390 manuals don't specify any magic sequence for altering
932 * the multicast regs on an already running card. To be safe, we
933 * ensure multicast mode is off prior to loading up the new hash
934 * table. If this proves to be not enough, we can always resort
935 * to stopping the NIC, loading the table and then restarting.
937 * Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC
938 * Elite16) appear to be write-only. The NS 8390 data sheet lists
939 * them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and
940 * Ultra32 EISA) appears to have this bug fixed.
943 if (netif_running(dev))
944 outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
945 outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
946 for(i = 0; i < 8; i++)
948 outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
950 if(inb_p(e8390_base + EN1_MULT_SHIFT(i))!=ei_local->mcfilter[i])
951 printk(KERN_ERR "Multicast filter read/write mismap %d\n",i);
954 outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
956 if(dev->flags&IFF_PROMISC)
957 outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
958 else if(dev->flags&IFF_ALLMULTI || dev->mc_list)
959 outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
961 outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
965 * Called without lock held. This is invoked from user context and may
966 * be parallel to just about everything else. Its also fairly quick and
967 * not called too often. Must protect against both bh and irq users
970 static void set_multicast_list(struct net_device *dev)
973 struct ei_device *ei_local = (struct ei_device*)netdev_priv(dev);
975 spin_lock_irqsave(&ei_local->page_lock, flags);
976 do_set_multicast_list(dev);
977 spin_unlock_irqrestore(&ei_local->page_lock, flags);
981 * ethdev_setup - init rest of 8390 device struct
982 * @dev: network device structure to init
984 * Initialize the rest of the 8390 device structure. Do NOT __init
985 * this, as it is used by 8390 based modular drivers too.
988 static void ethdev_setup(struct net_device *dev)
990 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
994 dev->hard_start_xmit = &ei_start_xmit;
995 dev->get_stats = get_stats;
996 dev->set_multicast_list = &set_multicast_list;
1000 spin_lock_init(&ei_local->page_lock);
1004 * alloc_ei_netdev - alloc_etherdev counterpart for 8390
1006 * Allocate 8390-specific net_device.
1008 struct net_device *__alloc_ei_netdev(int size)
1010 return alloc_netdev(sizeof(struct ei_device) + size, "eth%d",
1017 /* This page of functions should be 8390 generic */
1018 /* Follow National Semi's recommendations for initializing the "NIC". */
1021 * NS8390_init - initialize 8390 hardware
1022 * @dev: network device to initialize
1023 * @startp: boolean. non-zero value to initiate chip processing
1025 * Must be called with lock held.
1028 void NS8390_init(struct net_device *dev, int startp)
1030 long e8390_base = dev->base_addr;
1031 struct ei_device *ei_local = (struct ei_device *) netdev_priv(dev);
1033 int endcfg = ei_local->word16
1034 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
1037 if(sizeof(struct e8390_pkt_hdr)!=4)
1038 panic("8390.c: header struct mispacked\n");
1039 /* Follow National Semi's recommendations for initing the DP83902. */
1040 outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1041 outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */
1042 /* Clear the remote byte count registers. */
1043 outb_p(0x00, e8390_base + EN0_RCNTLO);
1044 outb_p(0x00, e8390_base + EN0_RCNTHI);
1045 /* Set to monitor and loopback mode -- this is vital!. */
1046 outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
1047 outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1048 /* Set the transmit page and receive ring. */
1049 outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1050 ei_local->tx1 = ei_local->tx2 = 0;
1051 outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1052 outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/
1053 ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */
1054 outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1055 /* Clear the pending interrupts and mask. */
1056 outb_p(0xFF, e8390_base + EN0_ISR);
1057 outb_p(0x00, e8390_base + EN0_IMR);
1059 /* Copy the station address into the DS8390 registers. */
1061 outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1062 for(i = 0; i < 6; i++)
1064 outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1065 if (ei_debug > 1 && inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1066 printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
1069 outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1070 outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1072 netif_start_queue(dev);
1073 ei_local->tx1 = ei_local->tx2 = 0;
1074 ei_local->txing = 0;
1078 outb_p(0xff, e8390_base + EN0_ISR);
1079 outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1080 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1081 outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
1082 /* 3c503 TechMan says rxconfig only after the NIC is started. */
1083 outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */
1084 do_set_multicast_list(dev); /* (re)load the mcast table */
1088 /* Trigger a transmit start, assuming the length is valid.
1089 Always called with the page lock held */
1091 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1094 long e8390_base = dev->base_addr;
1095 struct ei_device *ei_local __attribute((unused)) = (struct ei_device *) netdev_priv(dev);
1097 outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
1099 if (inb_p(e8390_base) & E8390_TRANS)
1101 printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
1105 outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1106 outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1107 outb_p(start_page, e8390_base + EN0_TPSR);
1108 outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1111 EXPORT_SYMBOL(ei_open);
1112 EXPORT_SYMBOL(ei_close);
1113 EXPORT_SYMBOL(ei_interrupt);
1114 #ifdef CONFIG_NET_POLL_CONTROLLER
1115 EXPORT_SYMBOL(ei_poll);
1117 EXPORT_SYMBOL(ei_tx_timeout);
1118 EXPORT_SYMBOL(NS8390_init);
1119 EXPORT_SYMBOL(__alloc_ei_netdev);
1123 int init_module(void)
1128 void cleanup_module(void)
1133 MODULE_LICENSE("GPL");