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Al Viro6c3561b2006-10-10 00:19:36 +01001/* 8390.c: A general NS8390 ethernet driver core for linux. */
2/*
3 Written 1992-94 by Donald Becker.
4
5 Copyright 1993 United States Government as represented by the
6 Director, National Security Agency.
7
8 This software may be used and distributed according to the terms
9 of the GNU General Public License, incorporated herein by reference.
10
11 The author may be reached as becker@scyld.com, or C/O
12 Scyld Computing Corporation
13 410 Severn Ave., Suite 210
14 Annapolis MD 21403
15
16
17 This is the chip-specific code for many 8390-based ethernet adaptors.
18 This is not a complete driver, it must be combined with board-specific
19 code such as ne.c, wd.c, 3c503.c, etc.
20
21 Seeing how at least eight drivers use this code, (not counting the
22 PCMCIA ones either) it is easy to break some card by what seems like
23 a simple innocent change. Please contact me or Donald if you think
24 you have found something that needs changing. -- PG
25
26
27 Changelog:
28
29 Paul Gortmaker : remove set_bit lock, other cleanups.
30 Paul Gortmaker : add ei_get_8390_hdr() so we can pass skb's to
31 ei_block_input() for eth_io_copy_and_sum().
32 Paul Gortmaker : exchange static int ei_pingpong for a #define,
33 also add better Tx error handling.
34 Paul Gortmaker : rewrite Rx overrun handling as per NS specs.
35 Alexey Kuznetsov : use the 8390's six bit hash multicast filter.
36 Paul Gortmaker : tweak ANK's above multicast changes a bit.
37 Paul Gortmaker : update packet statistics for v2.1.x
Lucas De Marchi25985ed2011-03-30 22:57:33 -030038 Alan Cox : support arbitrary stupid port mappings on the
Joe Perchesbe763c92011-06-22 20:38:57 +000039 68K Macintosh. Support >16bit I/O spaces
Al Viro6c3561b2006-10-10 00:19:36 +010040 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>
Joe Perches5aedcf52011-06-22 20:38:58 +000061#include <linux/uaccess.h>
62#include <linux/io.h>
Al Viro6c3561b2006-10-10 00:19:36 +010063#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);
Al Viro6c3561b2006-10-10 00:19:36 +0100111static 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);
Al Viro6c3561b2006-10-10 00:19:36 +0100117static 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 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300123 * The 8390 isn't exactly designed to be multithreaded on RX/TX. There is
Al Viro6c3561b2006-10-10 00:19:36 +0100124 * 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.
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200144 *
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
Robert P. J. Day14e4a0f2008-02-03 15:12:15 +0200149 * at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200150 * chips with FPGA front ends.
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400151 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200152 * Ok the logic behind the 8390 is very simple:
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400153 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200154 * 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
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400158 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200159 * 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)
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400162 *
163 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200164 * 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
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400171 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200172 * At this point an existing IRQ may still be running but we can't
173 * get a new one
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400174 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200175 * 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]
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400178 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200179 * Transmit (slow as ****)
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400180 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200181 * re-enable the IRQ
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400182 *
183 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200184 * We have to use disable_irq because otherwise you will get delayed
185 * interrupts on the APIC bus deadlocking the transmit path.
Jeff Garzik3f8cb092008-05-13 01:41:28 -0400186 *
Jarek Poplawski55b7b622007-07-26 14:44:01 +0200187 * 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]
Al Viro6c3561b2006-10-10 00:19:36 +0100190 */
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;
Joe Perchesece49152010-11-15 11:12:31 +0000205 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100206
Al Viro6c3561b2006-10-10 00:19:36 +0100207 if (dev->watchdog_timeo <= 0)
Joe Perchesbe763c92011-06-22 20:38:57 +0000208 dev->watchdog_timeo = TX_TIMEOUT;
Al Viro6c3561b2006-10-10 00:19:36 +0100209
210 /*
211 * Grab the page lock so we own the register set, then call
212 * the init function.
213 */
214
Joe Perchesbe763c92011-06-22 20:38:57 +0000215 spin_lock_irqsave(&ei_local->page_lock, flags);
Al Viro6c3561b2006-10-10 00:19:36 +0100216 __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);
Joe Perchesbe763c92011-06-22 20:38:57 +0000220 spin_unlock_irqrestore(&ei_local->page_lock, flags);
Al Viro6c3561b2006-10-10 00:19:36 +0100221 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{
Joe Perchesece49152010-11-15 11:12:31 +0000233 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100234 unsigned long flags;
235
236 /*
237 * Hold the page lock during close
238 */
239
Joe Perchesbe763c92011-06-22 20:38:57 +0000240 spin_lock_irqsave(&ei_local->page_lock, flags);
Al Viro6c3561b2006-10-10 00:19:36 +0100241 __NS8390_init(dev, 0);
Joe Perchesbe763c92011-06-22 20:38:57 +0000242 spin_unlock_irqrestore(&ei_local->page_lock, flags);
Al Viro6c3561b2006-10-10 00:19:36 +0100243 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
Stephen Hemminger8884c092008-11-25 18:12:49 -0800255static void __ei_tx_timeout(struct net_device *dev)
Al Viro6c3561b2006-10-10 00:19:36 +0100256{
257 unsigned long e8390_base = dev->base_addr;
Joe Perchesece49152010-11-15 11:12:31 +0000258 struct ei_device *ei_local = netdev_priv(dev);
Eric Dumazet1ae5dc32010-05-10 05:01:31 -0700259 int txsr, isr, tickssofar = jiffies - dev_trans_start(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100260 unsigned long flags;
261
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300262 dev->stats.tx_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100263
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
Joe Perches840f6392011-06-22 20:38:55 +0000269 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);
Al Viro6c3561b2006-10-10 00:19:36 +0100273
Joe Perches7340c4d2011-06-22 20:38:56 +0000274 if (!isr && !dev->stats.tx_packets) {
Al Viro6c3561b2006-10-10 00:19:36 +0100275 /* 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
Stephen Hemminger613573252009-08-31 19:50:58 +0000301static netdev_tx_t __ei_start_xmit(struct sk_buff *skb,
302 struct net_device *dev)
Al Viro6c3561b2006-10-10 00:19:36 +0100303{
304 unsigned long e8390_base = dev->base_addr;
Joe Perchesece49152010-11-15 11:12:31 +0000305 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100306 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
Joe Perches7340c4d2011-06-22 20:38:56 +0000346 if (ei_local->tx1 == 0) {
Al Viro6c3561b2006-10-10 00:19:36 +0100347 output_page = ei_local->tx_start_page;
348 ei_local->tx1 = send_length;
349 if (ei_debug && ei_local->tx2 > 0)
Joe Perches840f6392011-06-22 20:38:55 +0000350 netdev_dbg(dev, "idle transmitter tx2=%d, lasttx=%d, txing=%d\n",
351 ei_local->tx2, ei_local->lasttx, ei_local->txing);
Joe Perches7340c4d2011-06-22 20:38:56 +0000352 } else if (ei_local->tx2 == 0) {
Al Viro6c3561b2006-10-10 00:19:36 +0100353 output_page = ei_local->tx_start_page + TX_PAGES/2;
354 ei_local->tx2 = send_length;
355 if (ei_debug && ei_local->tx1 > 0)
Joe Perches840f6392011-06-22 20:38:55 +0000356 netdev_dbg(dev, "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n",
357 ei_local->tx1, ei_local->lasttx, ei_local->txing);
Joe Perches7340c4d2011-06-22 20:38:56 +0000358 } else { /* We should never get here. */
Al Viro6c3561b2006-10-10 00:19:36 +0100359 if (ei_debug)
Joe Perches840f6392011-06-22 20:38:55 +0000360 netdev_dbg(dev, "No Tx buffers free! tx1=%d tx2=%d last=%d\n",
361 ei_local->tx1, ei_local->tx2, ei_local->lasttx);
Al Viro6c3561b2006-10-10 00:19:36 +0100362 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);
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300367 dev->stats.tx_errors++;
Patrick McHardy5b548142009-06-12 06:22:29 +0000368 return NETDEV_TX_BUSY;
Al Viro6c3561b2006-10-10 00:19:36 +0100369 }
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
Joe Perchesbe763c92011-06-22 20:38:57 +0000379 if (!ei_local->txing) {
Al Viro6c3561b2006-10-10 00:19:36 +0100380 ei_local->txing = 1;
381 NS8390_trigger_send(dev, send_length, output_page);
Joe Perches7340c4d2011-06-22 20:38:56 +0000382 if (output_page == ei_local->tx_start_page) {
Al Viro6c3561b2006-10-10 00:19:36 +0100383 ei_local->tx1 = -1;
384 ei_local->lasttx = -1;
Joe Perches7340c4d2011-06-22 20:38:56 +0000385 } else {
Al Viro6c3561b2006-10-10 00:19:36 +0100386 ei_local->tx2 = -1;
387 ei_local->lasttx = -2;
388 }
Joe Perches7340c4d2011-06-22 20:38:56 +0000389 } else
390 ei_local->txqueue++;
Al Viro6c3561b2006-10-10 00:19:36 +0100391
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);
Richard Cochrand76b7e22011-06-19 21:51:24 +0000403 skb_tx_timestamp(skb);
Joe Perchesbe763c92011-06-22 20:38:57 +0000404 dev_kfree_skb(skb);
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300405 dev->stats.tx_bytes += send_length;
Al Viro6c3561b2006-10-10 00:19:36 +0100406
Patrick McHardyec634fe2009-07-05 19:23:38 -0700407 return NETDEV_TX_OK;
Al Viro6c3561b2006-10-10 00:19:36 +0100408}
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
Joe Perches7340c4d2011-06-22 20:38:56 +0000435 if (ei_local->irqlock) {
Nikanth Karthikesan6846ad22010-04-15 02:21:23 +0000436 /*
437 * This might just be an interrupt for a PCI device sharing
438 * this line
439 */
Joe Perches840f6392011-06-22 20:38:55 +0000440 netdev_err(dev, "Interrupted while interrupts are masked! isr=%#2x imr=%#2x\n",
441 ei_inb_p(e8390_base + EN0_ISR),
Al Viro6c3561b2006-10-10 00:19:36 +0100442 ei_inb_p(e8390_base + EN0_IMR));
Al Viro6c3561b2006-10-10 00:19:36 +0100443 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)
Joe Perches840f6392011-06-22 20:38:55 +0000450 netdev_dbg(dev, "interrupt(isr=%#2.2x)\n",
Al Viro6c3561b2006-10-10 00:19:36 +0100451 ei_inb_p(e8390_base + EN0_ISR));
452
453 /* !!Assumption!! -- we stay in page 0. Don't break this. */
Joe Perches8e95a202009-12-03 07:58:21 +0000454 while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0 &&
Joe Perches7340c4d2011-06-22 20:38:56 +0000455 ++nr_serviced < MAX_SERVICE) {
Al Viro6c3561b2006-10-10 00:19:36 +0100456 if (!netif_running(dev)) {
Joe Perches840f6392011-06-22 20:38:55 +0000457 netdev_warn(dev, "interrupt from stopped card\n");
Al Viro6c3561b2006-10-10 00:19:36 +0100458 /* 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);
Joe Perches7340c4d2011-06-22 20:38:56 +0000465 else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) {
Al Viro6c3561b2006-10-10 00:19:36 +0100466 /* 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
Joe Perches7340c4d2011-06-22 20:38:56 +0000475 if (interrupts & ENISR_COUNTERS) {
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300476 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);
Joe Perchesbe763c92011-06-22 20:38:57 +0000478 dev->stats.rx_missed_errors += ei_inb_p(e8390_base + EN0_COUNTER2);
Al Viro6c3561b2006-10-10 00:19:36 +0100479 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)
Al Viro6c3561b2006-10-10 00:19:36 +0100484 ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR);
Al Viro6c3561b2006-10-10 00:19:36 +0100485
486 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
487 }
488
Joe Perches7340c4d2011-06-22 20:38:56 +0000489 if (interrupts && ei_debug) {
Al Viro6c3561b2006-10-10 00:19:36 +0100490 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
Joe Perches7340c4d2011-06-22 20:38:56 +0000491 if (nr_serviced >= MAX_SERVICE) {
Al Viro6c3561b2006-10-10 00:19:36 +0100492 /* 0xFF is valid for a card removal */
Joe Perchesbe763c92011-06-22 20:38:57 +0000493 if (interrupts != 0xFF)
Joe Perches840f6392011-06-22 20:38:55 +0000494 netdev_warn(dev, "Too much work at interrupt, status %#2.2x\n",
495 interrupts);
Al Viro6c3561b2006-10-10 00:19:36 +0100496 ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
497 } else {
Joe Perches840f6392011-06-22 20:38:55 +0000498 netdev_warn(dev, "unknown interrupt %#2x\n", interrupts);
Al Viro6c3561b2006-10-10 00:19:36 +0100499 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{
Jarek Poplawskif47aeff2008-09-30 20:58:25 +0000509 disable_irq(dev->irq);
Al Viro6c3561b2006-10-10 00:19:36 +0100510 __ei_interrupt(dev->irq, dev);
Jarek Poplawskif47aeff2008-09-30 20:58:25 +0000511 enable_irq(dev->irq);
Al Viro6c3561b2006-10-10 00:19:36 +0100512}
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;
Stephen Rothwell0c1aa202008-05-29 22:39:28 +1000532 /* ei_local is used on some platforms via the EI_SHIFT macro */
533 struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100534 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
Joe Perches840f6392011-06-22 20:38:55 +0000538 netdev_dbg(dev, "transmitter error (%#2x):", txsr);
Al Viro6c3561b2006-10-10 00:19:36 +0100539 if (txsr & ENTSR_ABT)
Joe Perches840f6392011-06-22 20:38:55 +0000540 pr_cont(" excess-collisions ");
Al Viro6c3561b2006-10-10 00:19:36 +0100541 if (txsr & ENTSR_ND)
Joe Perches840f6392011-06-22 20:38:55 +0000542 pr_cont(" non-deferral ");
Al Viro6c3561b2006-10-10 00:19:36 +0100543 if (txsr & ENTSR_CRS)
Joe Perches840f6392011-06-22 20:38:55 +0000544 pr_cont(" lost-carrier ");
Al Viro6c3561b2006-10-10 00:19:36 +0100545 if (txsr & ENTSR_FU)
Joe Perches840f6392011-06-22 20:38:55 +0000546 pr_cont(" FIFO-underrun ");
Al Viro6c3561b2006-10-10 00:19:36 +0100547 if (txsr & ENTSR_CDH)
Joe Perches840f6392011-06-22 20:38:55 +0000548 pr_cont(" lost-heartbeat ");
549 pr_cont("\n");
Al Viro6c3561b2006-10-10 00:19:36 +0100550#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);
Joe Perches7340c4d2011-06-22 20:38:56 +0000556 else {
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300557 dev->stats.tx_errors++;
Joe Perchesbe763c92011-06-22 20:38:57 +0000558 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++;
Al Viro6c3561b2006-10-10 00:19:36 +0100564 }
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;
Joe Perchesece49152010-11-15 11:12:31 +0000578 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100579 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
Joe Perches7340c4d2011-06-22 20:38:56 +0000589 if (ei_local->tx1 < 0) {
Al Viro6c3561b2006-10-10 00:19:36 +0100590 if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
Joe Perches840f6392011-06-22 20:38:55 +0000591 pr_err("%s: bogus last_tx_buffer %d, tx1=%d\n",
592 ei_local->name, ei_local->lasttx, ei_local->tx1);
Al Viro6c3561b2006-10-10 00:19:36 +0100593 ei_local->tx1 = 0;
Joe Perches7340c4d2011-06-22 20:38:56 +0000594 if (ei_local->tx2 > 0) {
Al Viro6c3561b2006-10-10 00:19:36 +0100595 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;
Joe Perches7340c4d2011-06-22 20:38:56 +0000600 } else
601 ei_local->lasttx = 20, ei_local->txing = 0;
602 } else if (ei_local->tx2 < 0) {
Al Viro6c3561b2006-10-10 00:19:36 +0100603 if (ei_local->lasttx != 2 && ei_local->lasttx != -2)
Joe Perches840f6392011-06-22 20:38:55 +0000604 pr_err("%s: bogus last_tx_buffer %d, tx2=%d\n",
605 ei_local->name, ei_local->lasttx, ei_local->tx2);
Al Viro6c3561b2006-10-10 00:19:36 +0100606 ei_local->tx2 = 0;
Joe Perches7340c4d2011-06-22 20:38:56 +0000607 if (ei_local->tx1 > 0) {
Al Viro6c3561b2006-10-10 00:19:36 +0100608 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;
Joe Perches7340c4d2011-06-22 20:38:56 +0000613 } else
Al Viro6c3561b2006-10-10 00:19:36 +0100614 ei_local->lasttx = 10, ei_local->txing = 0;
Joe Perchesbe763c92011-06-22 20:38:57 +0000615 } /* else
616 netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n",
617 ei_local->lasttx);
618*/
Al Viro6c3561b2006-10-10 00:19:36 +0100619
620 /* Minimize Tx latency: update the statistics after we restart TXing. */
621 if (status & ENTSR_COL)
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300622 dev->stats.collisions++;
Al Viro6c3561b2006-10-10 00:19:36 +0100623 if (status & ENTSR_PTX)
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300624 dev->stats.tx_packets++;
Joe Perches7340c4d2011-06-22 20:38:56 +0000625 else {
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300626 dev->stats.tx_errors++;
Joe Perches7340c4d2011-06-22 20:38:56 +0000627 if (status & ENTSR_ABT) {
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300628 dev->stats.tx_aborted_errors++;
629 dev->stats.collisions += 16;
Al Viro6c3561b2006-10-10 00:19:36 +0100630 }
631 if (status & ENTSR_CRS)
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300632 dev->stats.tx_carrier_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100633 if (status & ENTSR_FU)
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300634 dev->stats.tx_fifo_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100635 if (status & ENTSR_CDH)
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300636 dev->stats.tx_heartbeat_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100637 if (status & ENTSR_OWC)
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300638 dev->stats.tx_window_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100639 }
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;
Joe Perchesece49152010-11-15 11:12:31 +0000654 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100655 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
Joe Perches7340c4d2011-06-22 20:38:56 +0000661 while (++rx_pkt_count < 10) {
Al Viro6c3561b2006-10-10 00:19:36 +0100662 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 */
Joe Perchesbe763c92011-06-22 20:38:57 +0000680 if (ei_debug > 0 &&
681 this_frame != ei_local->current_page &&
682 (this_frame != 0x0 || rxing_page != 0xFF))
Joe Perches840f6392011-06-22 20:38:55 +0000683 netdev_err(dev, "mismatched read page pointers %2x vs %2x\n",
684 this_frame, ei_local->current_page);
Al Viro6c3561b2006-10-10 00:19:36 +0100685
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. */
Joe Perches8e95a202009-12-03 07:58:21 +0000700 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) {
Al Viro6c3561b2006-10-10 00:19:36 +0100704 ei_local->current_page = rxing_page;
705 ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300706 dev->stats.rx_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100707 continue;
708 }
709
Joe Perches7340c4d2011-06-22 20:38:56 +0000710 if (pkt_len < 60 || pkt_len > 1518) {
Al Viro6c3561b2006-10-10 00:19:36 +0100711 if (ei_debug)
Joe Perches840f6392011-06-22 20:38:55 +0000712 netdev_dbg(dev, "bogus packet size: %d, status=%#2x nxpg=%#2x\n",
713 rx_frame.count, rx_frame.status,
Al Viro6c3561b2006-10-10 00:19:36 +0100714 rx_frame.next);
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300715 dev->stats.rx_errors++;
716 dev->stats.rx_length_errors++;
Joe Perches7340c4d2011-06-22 20:38:56 +0000717 } else if ((pkt_stat & 0x0F) == ENRSR_RXOK) {
Al Viro6c3561b2006-10-10 00:19:36 +0100718 struct sk_buff *skb;
719
720 skb = dev_alloc_skb(pkt_len+2);
Joe Perches7340c4d2011-06-22 20:38:56 +0000721 if (skb == NULL) {
Al Viro6c3561b2006-10-10 00:19:36 +0100722 if (ei_debug > 1)
Joe Perches840f6392011-06-22 20:38:55 +0000723 netdev_dbg(dev, "Couldn't allocate a sk_buff of size %d\n",
724 pkt_len);
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300725 dev->stats.rx_dropped++;
Al Viro6c3561b2006-10-10 00:19:36 +0100726 break;
Joe Perches7340c4d2011-06-22 20:38:56 +0000727 } else {
Joe Perchesbe763c92011-06-22 20:38:57 +0000728 skb_reserve(skb, 2); /* IP headers on 16 byte boundaries */
Al Viro6c3561b2006-10-10 00:19:36 +0100729 skb_put(skb, pkt_len); /* Make room */
730 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
Joe Perchesbe763c92011-06-22 20:38:57 +0000731 skb->protocol = eth_type_trans(skb, dev);
Richard Cochrand76b7e22011-06-19 21:51:24 +0000732 if (!skb_defer_rx_timestamp(skb))
733 netif_rx(skb);
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300734 dev->stats.rx_packets++;
735 dev->stats.rx_bytes += pkt_len;
Al Viro6c3561b2006-10-10 00:19:36 +0100736 if (pkt_stat & ENRSR_PHY)
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300737 dev->stats.multicast++;
Al Viro6c3561b2006-10-10 00:19:36 +0100738 }
Joe Perches7340c4d2011-06-22 20:38:56 +0000739 } else {
Al Viro6c3561b2006-10-10 00:19:36 +0100740 if (ei_debug)
Joe Perches840f6392011-06-22 20:38:55 +0000741 netdev_dbg(dev, "bogus packet: status=%#2x nxpg=%#2x size=%d\n",
742 rx_frame.status, rx_frame.next,
Al Viro6c3561b2006-10-10 00:19:36 +0100743 rx_frame.count);
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300744 dev->stats.rx_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100745 /* NB: The NIC counts CRC, frame and missed errors. */
746 if (pkt_stat & ENRSR_FO)
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300747 dev->stats.rx_fifo_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100748 }
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) {
Joe Perches840f6392011-06-22 20:38:55 +0000753 netdev_notice(dev, "next frame inconsistency, %#2x\n",
754 next_frame);
Al Viro6c3561b2006-10-10 00:19:36 +0100755 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);
Al Viro6c3561b2006-10-10 00:19:36 +0100764}
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;
Stephen Rothwell0c1aa202008-05-29 22:39:28 +1000783 /* ei_local is used on some platforms via the EI_SHIFT macro */
784 struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100785
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)
Joe Perches840f6392011-06-22 20:38:55 +0000794 netdev_dbg(dev, "Receiver overrun\n");
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300795 dev->stats.rx_over_errors++;
Al Viro6c3561b2006-10-10 00:19:36 +0100796
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
Joe Perches7340c4d2011-06-22 20:38:56 +0000817 if (was_txing) {
Al Viro6c3561b2006-10-10 00:19:36 +0100818 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)
Joe Perchesbe763c92011-06-22 20:38:57 +0000841 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
Al Viro6c3561b2006-10-10 00:19:36 +0100842}
843
844/*
845 * Collect the stats. This is called unlocked and from several contexts.
846 */
847
Stephen Hemminger8884c092008-11-25 18:12:49 -0800848static struct net_device_stats *__ei_get_stats(struct net_device *dev)
Al Viro6c3561b2006-10-10 00:19:36 +0100849{
850 unsigned long ioaddr = dev->base_addr;
Joe Perchesece49152010-11-15 11:12:31 +0000851 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100852 unsigned long flags;
853
854 /* If the card is stopped, just return the present stats. */
855 if (!netif_running(dev))
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300856 return &dev->stats;
Al Viro6c3561b2006-10-10 00:19:36 +0100857
Joe Perchesbe763c92011-06-22 20:38:57 +0000858 spin_lock_irqsave(&ei_local->page_lock, flags);
Al Viro6c3561b2006-10-10 00:19:36 +0100859 /* Read the counter registers, assuming we are in page 0. */
Joe Perchesbe763c92011-06-22 20:38:57 +0000860 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);
Al Viro6c3561b2006-10-10 00:19:36 +0100863 spin_unlock_irqrestore(&ei_local->page_lock, flags);
864
Paulius Zaleckas244d74f2008-05-07 02:20:40 +0300865 return &dev->stats;
Al Viro6c3561b2006-10-10 00:19:36 +0100866}
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{
Jiri Pirko22bedad32010-04-01 21:22:57 +0000875 struct netdev_hw_addr *ha;
Al Viro6c3561b2006-10-10 00:19:36 +0100876
Jiri Pirko22bedad32010-04-01 21:22:57 +0000877 netdev_for_each_mc_addr(ha, dev) {
878 u32 crc = ether_crc(ETH_ALEN, ha->addr);
Al Viro6c3561b2006-10-10 00:19:36 +0100879 /*
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;
Joe Perchesece49152010-11-15 11:12:31 +0000899 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100900
Joe Perches7340c4d2011-06-22 20:38:56 +0000901 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) {
Al Viro6c3561b2006-10-10 00:19:36 +0100902 memset(ei_local->mcfilter, 0, 8);
Jiri Pirkof9dcbcc2010-02-23 09:19:49 +0000903 if (!netdev_mc_empty(dev))
Al Viro6c3561b2006-10-10 00:19:36 +0100904 make_mc_bits(ei_local->mcfilter, dev);
Joe Perches7340c4d2011-06-22 20:38:56 +0000905 } else
Al Viro6c3561b2006-10-10 00:19:36 +0100906 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);
Joe Perchesbe763c92011-06-22 20:38:57 +0000924 for (i = 0; i < 8; i++) {
Al Viro6c3561b2006-10-10 00:19:36 +0100925 ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
926#ifndef BUG_83C690
Joe Perchesbe763c92011-06-22 20:38:57 +0000927 if (ei_inb_p(e8390_base + EN1_MULT_SHIFT(i)) != ei_local->mcfilter[i])
Joe Perches840f6392011-06-22 20:38:55 +0000928 netdev_err(dev, "Multicast filter read/write mismap %d\n",
929 i);
Al Viro6c3561b2006-10-10 00:19:36 +0100930#endif
931 }
932 ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
933
Joe Perchesbe763c92011-06-22 20:38:57 +0000934 if (dev->flags&IFF_PROMISC)
935 ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
Jiri Pirkof9dcbcc2010-02-23 09:19:49 +0000936 else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev))
Joe Perchesbe763c92011-06-22 20:38:57 +0000937 ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
938 else
939 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
940}
Al Viro6c3561b2006-10-10 00:19:36 +0100941
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
Stephen Hemminger8884c092008-11-25 18:12:49 -0800948static void __ei_set_multicast_list(struct net_device *dev)
Al Viro6c3561b2006-10-10 00:19:36 +0100949{
950 unsigned long flags;
Joe Perchesece49152010-11-15 11:12:31 +0000951 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100952
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{
Joe Perchesece49152010-11-15 11:12:31 +0000968 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +0100969 if (ei_debug > 1)
970 printk(version);
971
Al Viro6c3561b2006-10-10 00:19:36 +0100972 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;
Joe Perchesece49152010-11-15 11:12:31 +00001006 struct ei_device *ei_local = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +01001007 int i;
1008 int endcfg = ei_local->word16
1009 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
1010 : 0x48;
1011
Joe Perchesbe763c92011-06-22 20:38:57 +00001012 if (sizeof(struct e8390_pkt_hdr) != 4)
1013 panic("8390.c: header struct mispacked\n");
Al Viro6c3561b2006-10-10 00:19:36 +01001014 /* 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 */
Joe Perchesbe763c92011-06-22 20:38:57 +00001037 for (i = 0; i < 6; i++) {
Al Viro6c3561b2006-10-10 00:19:36 +01001038 ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
Joe Perchesbe763c92011-06-22 20:38:57 +00001039 if (ei_debug > 1 &&
1040 ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i)) != dev->dev_addr[i])
Joe Perches840f6392011-06-22 20:38:55 +00001041 netdev_err(dev, "Hw. address read/write mismap %d\n", i);
Al Viro6c3561b2006-10-10 00:19:36 +01001042 }
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
Al Viro6c3561b2006-10-10 00:19:36 +01001047 ei_local->tx1 = ei_local->tx2 = 0;
1048 ei_local->txing = 0;
1049
Joe Perches7340c4d2011-06-22 20:38:56 +00001050 if (startp) {
Al Viro6c3561b2006-10-10 00:19:36 +01001051 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;
Joe Perchesbe763c92011-06-22 20:38:57 +00001068 struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev);
Al Viro6c3561b2006-10-10 00:19:36 +01001069
1070 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
1071
Joe Perches7340c4d2011-06-22 20:38:56 +00001072 if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS) {
Joe Perches840f6392011-06-22 20:38:55 +00001073 netdev_warn(dev, "trigger_send() called with the transmitter busy\n");
Al Viro6c3561b2006-10-10 00:19:36 +01001074 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}