blob: 6ea963e3b89a1ab1c78ccb4d63c99a16e1bfbe0b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Linux ARCnet driver - device-independent routines
Joe Perchescb334642015-05-05 10:05:47 -07003 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * Written 1997 by David Woodhouse.
5 * Written 1994-1999 by Avery Pennarun.
6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
7 * Derived from skeleton.c by Donald Becker.
8 *
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
11 *
12 * **********************
13 *
14 * The original copyright was as follows:
15 *
16 * skeleton.c Written 1993 by Donald Becker.
17 * Copyright 1993 United States Government as represented by the
18 * Director, National Security Agency. This software may only be used
19 * and distributed according to the terms of the GNU General Public License as
20 * modified by SRC, incorporated herein by reference.
21 *
22 * **********************
Joe Perchescb334642015-05-05 10:05:47 -070023 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * The change log is now in a file called ChangeLog in this directory.
25 *
26 * Sources:
27 * - Crynwr arcnet.com/arcether.com packet drivers.
Joe Perchescb334642015-05-05 10:05:47 -070028 * - arcnet.c v0.00 dated 1/1/94 and apparently by
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * Donald Becker - it didn't work :)
30 * - skeleton.c v0.05 dated 11/16/93 by Donald Becker
31 * (from Linux Kernel 1.1.45)
32 * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
33 * - The official ARCnet COM9026 data sheets (!) thanks to
34 * Ken Cornetet <kcornete@nyx10.cs.du.edu>
35 * - The official ARCnet COM20020 data sheets.
36 * - Information on some more obscure ARCnet controller chips, thanks
37 * to the nice people at SMSC.
38 * - net/inet/eth.c (from kernel 1.1.50) for header-building info.
39 * - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
40 * - Textual information and more alternate source from Joachim Koenig
41 * <jojo@repas.de>
42 */
43
Joe Perches05a24b22015-05-05 10:05:56 -070044#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/types.h>
48#include <linux/delay.h>
49#include <linux/netdevice.h>
50#include <linux/if_arp.h>
51#include <net/arp.h>
52#include <linux/init.h>
Marcelo Feitoza Parisiff5688a2006-01-09 18:37:15 -080053#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Michael Grzeschik88906242014-09-18 00:12:50 +020055#include <linux/leds.h>
56
Joe Perches26c6d282015-05-05 10:06:03 -070057#include "arcdevice.h"
Joe Perches8e0f2952015-05-05 10:06:13 -070058#include "com9026.h"
Joe Perches26c6d282015-05-05 10:06:03 -070059
Linus Torvalds1da177e2005-04-16 15:20:36 -070060/* "do nothing" functions for protocol drivers */
61static void null_rx(struct net_device *dev, int bufnum,
62 struct archdr *pkthdr, int length);
63static int null_build_header(struct sk_buff *skb, struct net_device *dev,
64 unsigned short type, uint8_t daddr);
65static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
66 int length, int bufnum);
67
Adrian Bunkf03aa2d2006-01-14 03:10:22 +010068static void arcnet_rx(struct net_device *dev, int bufnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Joe Perchesf2f0a162015-05-05 10:05:52 -070070/* one ArcProto per possible proto ID. None of the elements of
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 * arc_proto_map are allowed to be NULL; they will get set to
72 * arc_proto_default instead. It also must not be NULL; if you would like
73 * to set it to NULL, set it to &arc_proto_null instead.
74 */
Joe Perches811eafc2015-05-05 10:05:57 -070075struct ArcProto *arc_proto_map[256];
76EXPORT_SYMBOL(arc_proto_map);
77
78struct ArcProto *arc_proto_default;
79EXPORT_SYMBOL(arc_proto_default);
80
81struct ArcProto *arc_bcast_proto;
82EXPORT_SYMBOL(arc_bcast_proto);
83
84struct ArcProto *arc_raw_proto;
85EXPORT_SYMBOL(arc_raw_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Joe Perches7f5e7602015-05-05 10:05:49 -070087static struct ArcProto arc_proto_null = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 .suffix = '?',
89 .mtu = XMTU,
90 .is_ip = 0,
91 .rx = null_rx,
92 .build_header = null_build_header,
93 .prepare_tx = null_prepare_tx,
94 .continue_tx = NULL,
95 .ack_tx = NULL
96};
97
98/* Exported function prototypes */
99int arcnet_debug = ARCNET_DEBUG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100EXPORT_SYMBOL(arcnet_debug);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102/* Internal function prototypes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700104 unsigned short type, const void *daddr,
105 const void *saddr, unsigned len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106static int go_tx(struct net_device *dev);
107
108static int debug = ARCNET_DEBUG;
109module_param(debug, int, 0);
110MODULE_LICENSE("GPL");
111
112static int __init arcnet_init(void)
113{
114 int count;
115
116 arcnet_debug = debug;
117
Joe Perches05a24b22015-05-05 10:05:56 -0700118 pr_info("arcnet loaded\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 /* initialize the protocol map */
121 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
122 for (count = 0; count < 256; count++)
123 arc_proto_map[count] = arc_proto_default;
124
Joe Perches72aeea42015-05-05 10:05:54 -0700125 if (BUGLVL(D_DURING))
Joe Perches05a24b22015-05-05 10:05:56 -0700126 pr_info("struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
127 sizeof(struct arc_hardware),
128 sizeof(struct arc_rfc1201),
129 sizeof(struct arc_rfc1051),
130 sizeof(struct arc_eth_encap),
131 sizeof(struct archdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 return 0;
134}
135
136static void __exit arcnet_exit(void)
137{
138}
139
140module_init(arcnet_init);
141module_exit(arcnet_exit);
142
Joe Perchesf2f0a162015-05-05 10:05:52 -0700143/* Dump the contents of an sk_buff */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144#if ARCNET_DEBUG_MAX & D_SKB
145void arcnet_dump_skb(struct net_device *dev,
146 struct sk_buff *skb, char *desc)
147{
Joe Perchesad361c92009-07-06 13:05:40 -0700148 char hdr[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Joe Perchesad361c92009-07-06 13:05:40 -0700150 /* dump the packet */
151 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
152 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
153 16, 1, skb->data, skb->len, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155EXPORT_SYMBOL(arcnet_dump_skb);
156#endif
157
Joe Perchesf2f0a162015-05-05 10:05:52 -0700158/* Dump the contents of an ARCnet buffer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100160static void arcnet_dump_packet(struct net_device *dev, int bufnum,
161 char *desc, int take_arcnet_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
Wang Chen454d7c92008-11-12 23:37:49 -0800163 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 int i, length;
165 unsigned long flags = 0;
166 static uint8_t buf[512];
Joe Perchesad361c92009-07-06 13:05:40 -0700167 char hdr[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169 /* hw.copy_from_card expects IRQ context so take the IRQ lock
Joe Perchesf2f0a162015-05-05 10:05:52 -0700170 * to keep it single threaded
171 */
Joe Perchescb334642015-05-05 10:05:47 -0700172 if (take_arcnet_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 spin_lock_irqsave(&lp->lock, flags);
174
175 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
Joe Perchescb334642015-05-05 10:05:47 -0700176 if (take_arcnet_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 spin_unlock_irqrestore(&lp->lock, flags);
178
179 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
180 length = (buf[2] ? 256 : 512);
181
Joe Perchesad361c92009-07-06 13:05:40 -0700182 /* dump the packet */
183 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
184 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
185 16, 1, buf, length, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100188#else
189
Joe Perchescb334642015-05-05 10:05:47 -0700190#define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0)
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192#endif
193
Michael Grzeschik88906242014-09-18 00:12:50 +0200194/* Trigger a LED event in response to a ARCNET device event */
195void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event)
196{
197 struct arcnet_local *lp = netdev_priv(dev);
198 unsigned long led_delay = 350;
199 unsigned long tx_delay = 50;
200
201 switch (event) {
202 case ARCNET_LED_EVENT_RECON:
203 led_trigger_blink_oneshot(lp->recon_led_trig,
204 &led_delay, &led_delay, 0);
205 break;
206 case ARCNET_LED_EVENT_OPEN:
207 led_trigger_event(lp->tx_led_trig, LED_OFF);
208 led_trigger_event(lp->recon_led_trig, LED_OFF);
209 break;
210 case ARCNET_LED_EVENT_STOP:
211 led_trigger_event(lp->tx_led_trig, LED_OFF);
212 led_trigger_event(lp->recon_led_trig, LED_OFF);
213 break;
214 case ARCNET_LED_EVENT_TX:
215 led_trigger_blink_oneshot(lp->tx_led_trig,
216 &tx_delay, &tx_delay, 0);
217 break;
218 }
219}
220EXPORT_SYMBOL_GPL(arcnet_led_event);
221
222static void arcnet_led_release(struct device *gendev, void *res)
223{
224 struct arcnet_local *lp = netdev_priv(to_net_dev(gendev));
225
226 led_trigger_unregister_simple(lp->tx_led_trig);
227 led_trigger_unregister_simple(lp->recon_led_trig);
228}
229
230/* Register ARCNET LED triggers for a arcnet device
231 *
232 * This is normally called from a driver's probe function
233 */
234void devm_arcnet_led_init(struct net_device *netdev, int index, int subid)
235{
236 struct arcnet_local *lp = netdev_priv(netdev);
237 void *res;
238
239 res = devres_alloc(arcnet_led_release, 0, GFP_KERNEL);
240 if (!res) {
241 netdev_err(netdev, "cannot register LED triggers\n");
242 return;
243 }
244
245 snprintf(lp->tx_led_trig_name, sizeof(lp->tx_led_trig_name),
246 "arc%d-%d-tx", index, subid);
247 snprintf(lp->recon_led_trig_name, sizeof(lp->recon_led_trig_name),
248 "arc%d-%d-recon", index, subid);
249
250 led_trigger_register_simple(lp->tx_led_trig_name,
251 &lp->tx_led_trig);
252 led_trigger_register_simple(lp->recon_led_trig_name,
253 &lp->recon_led_trig);
254
255 devres_add(&netdev->dev, res);
256}
257EXPORT_SYMBOL_GPL(devm_arcnet_led_init);
258
Joe Perchesf2f0a162015-05-05 10:05:52 -0700259/* Unregister a protocol driver from the arc_proto_map. Protocol drivers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 * are responsible for registering themselves, but the unregister routine
261 * is pretty generic so we'll do it here.
262 */
263void arcnet_unregister_proto(struct ArcProto *proto)
264{
265 int count;
266
267 if (arc_proto_default == proto)
268 arc_proto_default = &arc_proto_null;
269 if (arc_bcast_proto == proto)
270 arc_bcast_proto = arc_proto_default;
271 if (arc_raw_proto == proto)
272 arc_raw_proto = arc_proto_default;
273
274 for (count = 0; count < 256; count++) {
275 if (arc_proto_map[count] == proto)
276 arc_proto_map[count] = arc_proto_default;
277 }
278}
Joe Perches811eafc2015-05-05 10:05:57 -0700279EXPORT_SYMBOL(arcnet_unregister_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Joe Perchesf2f0a162015-05-05 10:05:52 -0700281/* Add a buffer to the queue. Only the interrupt handler is allowed to do
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 * this, unless interrupts are disabled.
Joe Perchescb334642015-05-05 10:05:47 -0700283 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 * Note: we don't check for a full queue, since there aren't enough buffers
285 * to more than fill it.
286 */
287static void release_arcbuf(struct net_device *dev, int bufnum)
288{
Wang Chen454d7c92008-11-12 23:37:49 -0800289 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 int i;
291
292 lp->buf_queue[lp->first_free_buf++] = bufnum;
293 lp->first_free_buf %= 5;
294
Joe Perches72aeea42015-05-05 10:05:54 -0700295 if (BUGLVL(D_DURING)) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700296 arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: ",
297 bufnum);
Joe Perchescb334642015-05-05 10:05:47 -0700298 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
Joe Perchesa34c0932015-05-05 10:05:55 -0700299 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);
300 arc_cont(D_DURING, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 }
302}
303
Joe Perchesf2f0a162015-05-05 10:05:52 -0700304/* Get a buffer from the queue.
305 * If this returns -1, there are no buffers available.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 */
307static int get_arcbuf(struct net_device *dev)
308{
Wang Chen454d7c92008-11-12 23:37:49 -0800309 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 int buf = -1, i;
311
312 if (!atomic_dec_and_test(&lp->buf_lock)) {
313 /* already in this function */
Joe Perchesa34c0932015-05-05 10:05:55 -0700314 arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n",
315 lp->buf_lock.counter);
Joe Perches7f5e7602015-05-05 10:05:49 -0700316 } else { /* we can continue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 if (lp->next_buf >= 5)
318 lp->next_buf -= 5;
319
Joe Perches7f5e7602015-05-05 10:05:49 -0700320 if (lp->next_buf == lp->first_free_buf) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700321 arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n");
Joe Perches7f5e7602015-05-05 10:05:49 -0700322 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 buf = lp->buf_queue[lp->next_buf++];
324 lp->next_buf %= 5;
325 }
326 }
327
Joe Perches72aeea42015-05-05 10:05:54 -0700328 if (BUGLVL(D_DURING)) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700329 arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: ",
330 buf);
Joe Perchescb334642015-05-05 10:05:47 -0700331 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
Joe Perchesa34c0932015-05-05 10:05:55 -0700332 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);
333 arc_cont(D_DURING, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 }
335
336 atomic_inc(&lp->buf_lock);
337 return buf;
338}
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340static int choose_mtu(void)
341{
342 int count, mtu = 65535;
343
344 /* choose the smallest MTU of all available encaps */
345 for (count = 0; count < 256; count++) {
Joe Perches8e95a202009-12-03 07:58:21 +0000346 if (arc_proto_map[count] != &arc_proto_null &&
347 arc_proto_map[count]->mtu < mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 mtu = arc_proto_map[count]->mtu;
349 }
350 }
351
352 return mtu == 65535 ? XMTU : mtu;
353}
354
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700355static const struct header_ops arcnet_header_ops = {
356 .create = arcnet_header,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700357};
358
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000359static const struct net_device_ops arcnet_netdev_ops = {
360 .ndo_open = arcnet_open,
361 .ndo_stop = arcnet_close,
362 .ndo_start_xmit = arcnet_send_packet,
363 .ndo_tx_timeout = arcnet_timeout,
364};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366/* Setup a struct device for ARCnet. */
367static void arcdev_setup(struct net_device *dev)
368{
369 dev->type = ARPHRD_ARCNET;
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000370 dev->netdev_ops = &arcnet_netdev_ops;
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700371 dev->header_ops = &arcnet_header_ops;
Michael Grzeschik980137a2015-09-17 15:18:34 +0200372 dev->hard_header_len = sizeof(struct arc_hardware);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 dev->mtu = choose_mtu();
374
375 dev->addr_len = ARCNET_ALEN;
376 dev->tx_queue_len = 100;
377 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
378 dev->watchdog_timeo = TX_TIMEOUT;
379
380 /* New-style flags. */
381 dev->flags = IFF_BROADCAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382}
383
Michael Grzeschik59fbcbc2015-09-16 10:15:45 +0200384static void arcnet_timer(unsigned long data)
385{
386 struct net_device *dev = (struct net_device *)data;
387
388 if (!netif_carrier_ok(dev)) {
389 netif_carrier_on(dev);
390 netdev_info(dev, "link up\n");
391 }
392}
393
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000394struct net_device *alloc_arcdev(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
396 struct net_device *dev;
397
398 dev = alloc_netdev(sizeof(struct arcnet_local),
Tom Gundersenc835a672014-07-14 16:37:24 +0200399 name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
400 arcdev_setup);
Joe Perchescb334642015-05-05 10:05:47 -0700401 if (dev) {
Wang Chen454d7c92008-11-12 23:37:49 -0800402 struct arcnet_local *lp = netdev_priv(dev);
Joe Perches01a1d5a2015-05-05 10:05:48 -0700403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 spin_lock_init(&lp->lock);
Michael Grzeschik59fbcbc2015-09-16 10:15:45 +0200405 init_timer(&lp->timer);
406 lp->timer.data = (unsigned long) dev;
407 lp->timer.function = arcnet_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 }
409
410 return dev;
411}
Joe Perches811eafc2015-05-05 10:05:57 -0700412EXPORT_SYMBOL(alloc_arcdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Joe Perchesf2f0a162015-05-05 10:05:52 -0700414/* Open/initialize the board. This is called sometime after booting when
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 * the 'ifconfig' program is run.
416 *
417 * This routine should set everything up anew at each open, even registers
418 * that "should" only need to be set once at boot, so that there is
419 * non-reboot way to recover if something goes wrong.
420 */
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000421int arcnet_open(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Wang Chen454d7c92008-11-12 23:37:49 -0800423 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 int count, newmtu, error;
425
Joe Perchesa34c0932015-05-05 10:05:55 -0700426 arc_printk(D_INIT, dev, "opened.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 if (!try_module_get(lp->hw.owner))
429 return -ENODEV;
430
Joe Perches72aeea42015-05-05 10:05:54 -0700431 if (BUGLVL(D_PROTO)) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700432 arc_printk(D_PROTO, dev, "protocol map (default is '%c'): ",
433 arc_proto_default->suffix);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 for (count = 0; count < 256; count++)
Joe Perchesa34c0932015-05-05 10:05:55 -0700435 arc_cont(D_PROTO, "%c", arc_proto_map[count]->suffix);
436 arc_cont(D_PROTO, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 }
438
Joe Perchesa34c0932015-05-05 10:05:55 -0700439 arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 /* try to put the card in a defined state - if it fails the first
442 * time, actually reset it.
443 */
444 error = -ENODEV;
Joe Perchese15b0362015-05-05 10:06:12 -0700445 if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 goto out_module_put;
447
448 newmtu = choose_mtu();
449 if (newmtu < dev->mtu)
450 dev->mtu = newmtu;
451
Joe Perchesa34c0932015-05-05 10:05:55 -0700452 arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n", dev->mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454 /* autodetect the encapsulation for each host. */
455 memset(lp->default_proto, 0, sizeof(lp->default_proto));
456
457 /* the broadcast address is special - use the 'bcast' protocol */
458 for (count = 0; count < 256; count++) {
459 if (arc_proto_map[count] == arc_bcast_proto) {
460 lp->default_proto[0] = count;
461 break;
462 }
463 }
464
465 /* initialize buffers */
466 atomic_set(&lp->buf_lock, 1);
467
468 lp->next_buf = lp->first_free_buf = 0;
469 release_arcbuf(dev, 0);
470 release_arcbuf(dev, 1);
471 release_arcbuf(dev, 2);
472 release_arcbuf(dev, 3);
473 lp->cur_tx = lp->next_tx = -1;
474 lp->cur_rx = -1;
475
476 lp->rfc1201.sequence = 1;
477
478 /* bring up the hardware driver */
479 if (lp->hw.open)
480 lp->hw.open(dev);
481
482 if (dev->dev_addr[0] == 0)
Joe Perchesa34c0932015-05-05 10:05:55 -0700483 arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 else if (dev->dev_addr[0] == 255)
Joe Perchesa34c0932015-05-05 10:05:55 -0700485 arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Joe Perchesa34c0932015-05-05 10:05:55 -0700487 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
Joe Perchese15b0362015-05-05 10:06:12 -0700488 if (lp->hw.status(dev) & RESETflag) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700489 arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
490 __FILE__, __LINE__, __func__);
Joe Perchese15b0362015-05-05 10:06:12 -0700491 lp->hw.command(dev, CFLAGScmd | RESETclear);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 }
493
Joe Perchesa34c0932015-05-05 10:05:55 -0700494 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 /* make sure we're ready to receive IRQ's. */
Joe Perchese15b0362015-05-05 10:06:12 -0700496 lp->hw.intmask(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 udelay(1); /* give it time to set the mask before
498 * we reset it again. (may not even be
499 * necessary)
500 */
Joe Perchesa34c0932015-05-05 10:05:55 -0700501 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 lp->intmask = NORXflag | RECONflag;
Joe Perchese15b0362015-05-05 10:06:12 -0700503 lp->hw.intmask(dev, lp->intmask);
Joe Perchesa34c0932015-05-05 10:05:55 -0700504 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
Michael Grzeschik59fbcbc2015-09-16 10:15:45 +0200506 netif_carrier_off(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 netif_start_queue(dev);
Michael Grzeschik59fbcbc2015-09-16 10:15:45 +0200508 mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
Michael Grzeschik88906242014-09-18 00:12:50 +0200510 arcnet_led_event(dev, ARCNET_LED_EVENT_OPEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 return 0;
512
513 out_module_put:
514 module_put(lp->hw.owner);
515 return error;
516}
Joe Perches811eafc2015-05-05 10:05:57 -0700517EXPORT_SYMBOL(arcnet_open);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519/* The inverse routine to arcnet_open - shuts down the card. */
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000520int arcnet_close(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521{
Wang Chen454d7c92008-11-12 23:37:49 -0800522 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Michael Grzeschik88906242014-09-18 00:12:50 +0200524 arcnet_led_event(dev, ARCNET_LED_EVENT_STOP);
Michael Grzeschik59fbcbc2015-09-16 10:15:45 +0200525 del_timer_sync(&lp->timer);
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 netif_stop_queue(dev);
Michael Grzeschik59fbcbc2015-09-16 10:15:45 +0200528 netif_carrier_off(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
530 /* flush TX and disable RX */
Joe Perchese15b0362015-05-05 10:06:12 -0700531 lp->hw.intmask(dev, 0);
532 lp->hw.command(dev, NOTXcmd); /* stop transmit */
533 lp->hw.command(dev, NORXcmd); /* disable receive */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 mdelay(1);
535
536 /* shut down the card */
537 lp->hw.close(dev);
538 module_put(lp->hw.owner);
539 return 0;
540}
Joe Perches811eafc2015-05-05 10:05:57 -0700541EXPORT_SYMBOL(arcnet_close);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700544 unsigned short type, const void *daddr,
545 const void *saddr, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700547 const struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 uint8_t _daddr, proto_num;
549 struct ArcProto *proto;
550
Joe Perchesa34c0932015-05-05 10:05:55 -0700551 arc_printk(D_DURING, dev,
552 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
553 saddr ? *(uint8_t *)saddr : -1,
554 daddr ? *(uint8_t *)daddr : -1,
555 type, type, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Joe Perchescb334642015-05-05 10:05:47 -0700557 if (skb->len != 0 && len != skb->len)
Joe Perchesa34c0932015-05-05 10:05:55 -0700558 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
559 skb->len, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Joe Perchescb334642015-05-05 10:05:47 -0700561 /* Type is host order - ? */
562 if (type == ETH_P_ARCNET) {
563 proto = arc_raw_proto;
Joe Perchesa34c0932015-05-05 10:05:55 -0700564 arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n",
565 proto->suffix);
Joe Perchescb334642015-05-05 10:05:47 -0700566 _daddr = daddr ? *(uint8_t *)daddr : 0;
Joe Perches7f5e7602015-05-05 10:05:49 -0700567 } else if (!daddr) {
Joe Perchesf2f0a162015-05-05 10:05:52 -0700568 /* if the dest addr isn't provided, we can't choose an
569 * encapsulation! Store the packet type (eg. ETH_P_IP)
570 * for now, and we'll push on a real header when we do
571 * rebuild_header.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 */
Joe Perchescb334642015-05-05 10:05:47 -0700573 *(uint16_t *)skb_push(skb, 2) = type;
Joe Perchesf2f0a162015-05-05 10:05:52 -0700574 /* XXX: Why not use skb->mac_len? */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700575 if (skb->network_header - skb->mac_header != 2)
Joe Perchesa34c0932015-05-05 10:05:55 -0700576 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n",
577 skb->network_header - skb->mac_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 return -2; /* return error -- can't transmit yet! */
Joe Perches7f5e7602015-05-05 10:05:49 -0700579 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 /* otherwise, we can just add the header as usual. */
Joe Perchescb334642015-05-05 10:05:47 -0700581 _daddr = *(uint8_t *)daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 proto_num = lp->default_proto[_daddr];
583 proto = arc_proto_map[proto_num];
Joe Perchesa34c0932015-05-05 10:05:55 -0700584 arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n",
585 proto_num, proto->suffix);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700587 arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n",
588 arc_bcast_proto->suffix);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 proto = arc_bcast_proto;
590 }
591 }
592 return proto->build_header(skb, dev, type, _daddr);
593}
594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595/* Called by the kernel in order to transmit a packet. */
Stephen Hemminger613573252009-08-31 19:50:58 +0000596netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
Joe Perchescb334642015-05-05 10:05:47 -0700597 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598{
Wang Chen454d7c92008-11-12 23:37:49 -0800599 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 struct archdr *pkt;
601 struct arc_rfc1201 *soft;
602 struct ArcProto *proto;
603 int txbuf;
604 unsigned long flags;
Michael Grzeschikb82de0e2015-04-22 16:41:46 +0200605 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Joe Perchesa34c0932015-05-05 10:05:55 -0700607 arc_printk(D_DURING, dev,
608 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
Joe Perchese15b0362015-05-05 10:06:12 -0700609 lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Joe Perchescb334642015-05-05 10:05:47 -0700611 pkt = (struct archdr *)skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 soft = &pkt->soft.rfc1201;
613 proto = arc_proto_map[soft->proto];
614
Joe Perchesa34c0932015-05-05 10:05:55 -0700615 arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n",
616 skb->len, pkt->hard.dest);
Joe Perches72aeea42015-05-05 10:05:54 -0700617 if (BUGLVL(D_SKB))
618 arcnet_dump_skb(dev, skb, "tx");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620 /* fits in one packet? */
621 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700622 arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 dev_kfree_skb(skb);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700624 return NETDEV_TX_OK; /* don't try again */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 }
626
627 /* We're busy transmitting a packet... */
628 netif_stop_queue(dev);
629
630 spin_lock_irqsave(&lp->lock, flags);
Joe Perchese15b0362015-05-05 10:06:12 -0700631 lp->hw.intmask(dev, 0);
Joe Perchescb334642015-05-05 10:05:47 -0700632 if (lp->next_tx == -1)
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700633 txbuf = get_arcbuf(dev);
Joe Perches7f5e7602015-05-05 10:05:49 -0700634 else
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700635 txbuf = -1;
Joe Perches7f5e7602015-05-05 10:05:49 -0700636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 if (txbuf != -1) {
638 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
639 !proto->ack_tx) {
640 /* done right away and we don't want to acknowledge
Joe Perchesf2f0a162015-05-05 10:05:52 -0700641 * the package later - forget about it now
642 */
Stephen Hemminger5803c512009-01-09 13:01:08 +0000643 dev->stats.tx_bytes += skb->len;
Michael Grzeschikb82de0e2015-04-22 16:41:46 +0200644 dev_kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 } else {
646 /* do it the 'split' way */
647 lp->outgoing.proto = proto;
648 lp->outgoing.skb = skb;
649 lp->outgoing.pkt = pkt;
650
651 if (proto->continue_tx &&
652 proto->continue_tx(dev, txbuf)) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700653 arc_printk(D_NORMAL, dev,
654 "bug! continue_tx finished the first time! (proto='%c')\n",
655 proto->suffix);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 }
657 }
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700658 retval = NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 lp->next_tx = txbuf;
660 } else {
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700661 retval = NETDEV_TX_BUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 }
663
Joe Perchesa34c0932015-05-05 10:05:55 -0700664 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
Joe Perchese15b0362015-05-05 10:06:12 -0700665 __FILE__, __LINE__, __func__, lp->hw.status(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 /* make sure we didn't ignore a TX IRQ while we were in here */
Joe Perchese15b0362015-05-05 10:06:12 -0700667 lp->hw.intmask(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Joe Perchesa34c0932015-05-05 10:05:55 -0700669 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
Joe Perchescb334642015-05-05 10:05:47 -0700670 lp->intmask |= TXFREEflag | EXCNAKflag;
Joe Perchese15b0362015-05-05 10:06:12 -0700671 lp->hw.intmask(dev, lp->intmask);
Joe Perchesa34c0932015-05-05 10:05:55 -0700672 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
Joe Perchese15b0362015-05-05 10:06:12 -0700673 __FILE__, __LINE__, __func__, lp->hw.status(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
Michael Grzeschik88906242014-09-18 00:12:50 +0200675 arcnet_led_event(dev, ARCNET_LED_EVENT_TX);
676
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 spin_unlock_irqrestore(&lp->lock, flags);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700678 return retval; /* no need to try again */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679}
Joe Perches811eafc2015-05-05 10:05:57 -0700680EXPORT_SYMBOL(arcnet_send_packet);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
Joe Perchesf2f0a162015-05-05 10:05:52 -0700682/* Actually start transmitting a packet that was loaded into a buffer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 * by prepare_tx. This should _only_ be called by the interrupt handler.
684 */
685static int go_tx(struct net_device *dev)
686{
Wang Chen454d7c92008-11-12 23:37:49 -0800687 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
Joe Perchesa34c0932015-05-05 10:05:55 -0700689 arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
Joe Perchese15b0362015-05-05 10:06:12 -0700690 lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692 if (lp->cur_tx != -1 || lp->next_tx == -1)
693 return 0;
694
Joe Perches72aeea42015-05-05 10:05:54 -0700695 if (BUGLVL(D_TX))
696 arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 lp->cur_tx = lp->next_tx;
699 lp->next_tx = -1;
700
701 /* start sending */
Joe Perchese15b0362015-05-05 10:06:12 -0700702 lp->hw.command(dev, TXcmd | (lp->cur_tx << 3));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Stephen Hemminger5803c512009-01-09 13:01:08 +0000704 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 lp->lasttrans_dest = lp->lastload_dest;
706 lp->lastload_dest = 0;
707 lp->excnak_pending = 0;
Joe Perchescb334642015-05-05 10:05:47 -0700708 lp->intmask |= TXFREEflag | EXCNAKflag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
710 return 1;
711}
712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713/* Called by the kernel when transmit times out */
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000714void arcnet_timeout(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715{
716 unsigned long flags;
Wang Chen454d7c92008-11-12 23:37:49 -0800717 struct arcnet_local *lp = netdev_priv(dev);
Joe Perchese15b0362015-05-05 10:06:12 -0700718 int status = lp->hw.status(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 char *msg;
720
721 spin_lock_irqsave(&lp->lock, flags);
722 if (status & TXFREEflag) { /* transmit _DID_ finish */
723 msg = " - missed IRQ?";
724 } else {
725 msg = "";
Stephen Hemminger5803c512009-01-09 13:01:08 +0000726 dev->stats.tx_aborted_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 lp->timed_out = 1;
Joe Perchese15b0362015-05-05 10:06:12 -0700728 lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 }
Stephen Hemminger5803c512009-01-09 13:01:08 +0000730 dev->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
732 /* make sure we didn't miss a TX or a EXC NAK IRQ */
Joe Perchese15b0362015-05-05 10:06:12 -0700733 lp->hw.intmask(dev, 0);
Joe Perchescb334642015-05-05 10:05:47 -0700734 lp->intmask |= TXFREEflag | EXCNAKflag;
Joe Perchese15b0362015-05-05 10:06:12 -0700735 lp->hw.intmask(dev, lp->intmask);
Joe Perchescb334642015-05-05 10:05:47 -0700736
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 spin_unlock_irqrestore(&lp->lock, flags);
738
Joe Perchescb334642015-05-05 10:05:47 -0700739 if (time_after(jiffies, lp->last_timeout + 10 * HZ)) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700740 arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
741 msg, status, lp->intmask, lp->lasttrans_dest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 lp->last_timeout = jiffies;
743 }
744
745 if (lp->cur_tx == -1)
746 netif_wake_queue(dev);
747}
Joe Perches811eafc2015-05-05 10:05:57 -0700748EXPORT_SYMBOL(arcnet_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Joe Perchesf2f0a162015-05-05 10:05:52 -0700750/* The typical workload of the driver: Handle the network interface
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 * interrupts. Establish which device needs attention, and call the correct
752 * chipset interrupt handler.
753 */
David Howells7d12e782006-10-05 14:55:46 +0100754irqreturn_t arcnet_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755{
756 struct net_device *dev = dev_id;
757 struct arcnet_local *lp;
758 int recbuf, status, diagstatus, didsomething, boguscount;
759 int retval = IRQ_NONE;
760
Joe Perchesa34c0932015-05-05 10:05:55 -0700761 arc_printk(D_DURING, dev, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
Joe Perchesa34c0932015-05-05 10:05:55 -0700763 arc_printk(D_DURING, dev, "in arcnet_interrupt\n");
Wang Chen454d7c92008-11-12 23:37:49 -0800764
765 lp = netdev_priv(dev);
Eric Sesterhenn5d9428d2006-04-02 13:52:48 +0200766 BUG_ON(!lp);
Joe Perchescb334642015-05-05 10:05:47 -0700767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 spin_lock(&lp->lock);
769
Joe Perchesf2f0a162015-05-05 10:05:52 -0700770 /* RESET flag was enabled - if device is not running, we must
771 * clear it right away (but nothing else).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 */
773 if (!netif_running(dev)) {
Joe Perchese15b0362015-05-05 10:06:12 -0700774 if (lp->hw.status(dev) & RESETflag)
775 lp->hw.command(dev, CFLAGScmd | RESETclear);
776 lp->hw.intmask(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 spin_unlock(&lp->lock);
Michael Grzeschik226ee672014-09-29 11:55:34 +0200778 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 }
780
Joe Perchesa34c0932015-05-05 10:05:55 -0700781 arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
Joe Perchese15b0362015-05-05 10:06:12 -0700782 lp->hw.status(dev), lp->intmask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784 boguscount = 5;
785 do {
Joe Perchese15b0362015-05-05 10:06:12 -0700786 status = lp->hw.status(dev);
Joe Perchescb334642015-05-05 10:05:47 -0700787 diagstatus = (status >> 8) & 0xFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Joe Perchesa34c0932015-05-05 10:05:55 -0700789 arc_printk(D_DEBUG, dev, "%s: %d: %s: status=%x\n",
790 __FILE__, __LINE__, __func__, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 didsomething = 0;
792
Joe Perchesf2f0a162015-05-05 10:05:52 -0700793 /* RESET flag was enabled - card is resetting and if RX is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 * disabled, it's NOT because we just got a packet.
Joe Perchescb334642015-05-05 10:05:47 -0700795 *
Joe Perchesf2f0a162015-05-05 10:05:52 -0700796 * The card is in an undefined state.
797 * Clear it out and start over.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 */
799 if (status & RESETflag) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700800 arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n",
801 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 arcnet_close(dev);
803 arcnet_open(dev);
804
805 /* get out of the interrupt handler! */
806 break;
807 }
Joe Perchesf2f0a162015-05-05 10:05:52 -0700808 /* RX is inhibited - we must have received something.
809 * Prepare to receive into the next buffer.
Joe Perchescb334642015-05-05 10:05:47 -0700810 *
Joe Perchesf2f0a162015-05-05 10:05:52 -0700811 * We don't actually copy the received packet from the card
812 * until after the transmit handler runs (and possibly
813 * launches the next tx); this should improve latency slightly
814 * if we get both types of interrupts at once.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 */
816 recbuf = -1;
817 if (status & lp->intmask & NORXflag) {
818 recbuf = lp->cur_rx;
Joe Perchesa34c0932015-05-05 10:05:55 -0700819 arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n",
820 recbuf, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822 lp->cur_rx = get_arcbuf(dev);
823 if (lp->cur_rx != -1) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700824 arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n",
825 lp->cur_rx);
Joe Perchese15b0362015-05-05 10:06:12 -0700826 lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 }
828 didsomething++;
829 }
830
Joe Perchescb334642015-05-05 10:05:47 -0700831 if ((diagstatus & EXCNAKflag)) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700832 arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n",
833 diagstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Joe Perchese15b0362015-05-05 10:06:12 -0700835 lp->hw.command(dev, NOTXcmd); /* disable transmit */
Joe Perchescb334642015-05-05 10:05:47 -0700836 lp->excnak_pending = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
Joe Perchese15b0362015-05-05 10:06:12 -0700838 lp->hw.command(dev, EXCNAKclear);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 lp->intmask &= ~(EXCNAKflag);
Joe Perchescb334642015-05-05 10:05:47 -0700840 didsomething++;
841 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 /* a transmit finished, and we're interested in it. */
844 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
Joe Perchescb334642015-05-05 10:05:47 -0700845 lp->intmask &= ~(TXFREEflag | EXCNAKflag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
Joe Perchesd6d7d3e2015-05-05 10:06:02 -0700847 arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n",
848 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
850 if (lp->cur_tx != -1 && !lp->timed_out) {
Joe Perchescb334642015-05-05 10:05:47 -0700851 if (!(status & TXACKflag)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 if (lp->lasttrans_dest != 0) {
Joe Perchesa34c0932015-05-05 10:05:55 -0700853 arc_printk(D_EXTRA, dev,
854 "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n",
855 status,
856 lp->lasttrans_dest);
Stephen Hemminger5803c512009-01-09 13:01:08 +0000857 dev->stats.tx_errors++;
858 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 } else {
Joe Perchesa34c0932015-05-05 10:05:55 -0700860 arc_printk(D_DURING, dev,
861 "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n",
862 status,
863 lp->lasttrans_dest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 }
865 }
866
867 if (lp->outgoing.proto &&
868 lp->outgoing.proto->ack_tx) {
Joe Perchescb334642015-05-05 10:05:47 -0700869 int ackstatus;
Joe Perches01a1d5a2015-05-05 10:05:48 -0700870
Joe Perchescb334642015-05-05 10:05:47 -0700871 if (status & TXACKflag)
872 ackstatus = 2;
873 else if (lp->excnak_pending)
874 ackstatus = 1;
875 else
876 ackstatus = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Joe Perchescb334642015-05-05 10:05:47 -0700878 lp->outgoing.proto
879 ->ack_tx(dev, ackstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 }
881 }
882 if (lp->cur_tx != -1)
883 release_arcbuf(dev, lp->cur_tx);
884
885 lp->cur_tx = -1;
886 lp->timed_out = 0;
887 didsomething++;
888
889 /* send another packet if there is one */
890 go_tx(dev);
891
892 /* continue a split packet, if any */
Joe Perchesd6d7d3e2015-05-05 10:06:02 -0700893 if (lp->outgoing.proto &&
894 lp->outgoing.proto->continue_tx) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 int txbuf = get_arcbuf(dev);
Joe Perches01a1d5a2015-05-05 10:05:48 -0700896
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 if (txbuf != -1) {
898 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
899 /* that was the last segment */
Stephen Hemminger5803c512009-01-09 13:01:08 +0000900 dev->stats.tx_bytes += lp->outgoing.skb->len;
Joe Perches7f5e7602015-05-05 10:05:49 -0700901 if (!lp->outgoing.proto->ack_tx) {
Joe Perchescb334642015-05-05 10:05:47 -0700902 dev_kfree_skb_irq(lp->outgoing.skb);
903 lp->outgoing.proto = NULL;
904 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 }
906 lp->next_tx = txbuf;
907 }
908 }
909 /* inform upper layers of idleness, if necessary */
910 if (lp->cur_tx == -1)
911 netif_wake_queue(dev);
912 }
913 /* now process the received packet, if any */
914 if (recbuf != -1) {
Joe Perches72aeea42015-05-05 10:05:54 -0700915 if (BUGLVL(D_RX))
916 arcnet_dump_packet(dev, recbuf, "rx irq", 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
918 arcnet_rx(dev, recbuf);
919 release_arcbuf(dev, recbuf);
920
921 didsomething++;
922 }
923 if (status & lp->intmask & RECONflag) {
Joe Perchese15b0362015-05-05 10:06:12 -0700924 lp->hw.command(dev, CFLAGScmd | CONFIGclear);
Stephen Hemminger5803c512009-01-09 13:01:08 +0000925 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
Joe Perchesa34c0932015-05-05 10:05:55 -0700927 arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n",
928 status);
Michael Grzeschik59fbcbc2015-09-16 10:15:45 +0200929 if (netif_carrier_ok(dev)) {
930 netif_carrier_off(dev);
931 netdev_info(dev, "link down\n");
932 }
933 mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000));
934
Michael Grzeschik88906242014-09-18 00:12:50 +0200935 arcnet_led_event(dev, ARCNET_LED_EVENT_RECON);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700936 /* MYRECON bit is at bit 7 of diagstatus */
Joe Perchescb334642015-05-05 10:05:47 -0700937 if (diagstatus & 0x80)
Joe Perchesa34c0932015-05-05 10:05:55 -0700938 arc_printk(D_RECON, dev, "Put out that recon myself\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
940 /* is the RECON info empty or old? */
941 if (!lp->first_recon || !lp->last_recon ||
S.Caglar Onur9307b572008-03-28 14:41:24 -0700942 time_after(jiffies, lp->last_recon + HZ * 10)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 if (lp->network_down)
Joe Perchesa34c0932015-05-05 10:05:55 -0700944 arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 lp->first_recon = lp->last_recon = jiffies;
946 lp->num_recons = lp->network_down = 0;
947
Joe Perchesa34c0932015-05-05 10:05:55 -0700948 arc_printk(D_DURING, dev, "recon: clearing counters.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 } else { /* add to current RECON counter */
950 lp->last_recon = jiffies;
951 lp->num_recons++;
952
Joe Perchesa34c0932015-05-05 10:05:55 -0700953 arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n",
954 lp->num_recons,
955 (lp->last_recon - lp->first_recon) / HZ,
956 lp->network_down);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
958 /* if network is marked up;
959 * and first_recon and last_recon are 60+ apart;
960 * and the average no. of recons counted is
961 * > RECON_THRESHOLD/min;
962 * then print a warning message.
963 */
Joe Perches8e95a202009-12-03 07:58:21 +0000964 if (!lp->network_down &&
965 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
966 lp->num_recons >= RECON_THRESHOLD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 lp->network_down = 1;
Joe Perchesa34c0932015-05-05 10:05:55 -0700968 arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n");
Joe Perches8e95a202009-12-03 07:58:21 +0000969 } else if (!lp->network_down &&
970 lp->last_recon - lp->first_recon > HZ * 60) {
Joe Perchesd6d7d3e2015-05-05 10:06:02 -0700971 /* reset counters if we've gone for
972 * over a minute.
973 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 lp->first_recon = lp->last_recon;
975 lp->num_recons = 1;
976 }
977 }
S.Caglar Onur9307b572008-03-28 14:41:24 -0700978 } else if (lp->network_down &&
Joe Perchescb334642015-05-05 10:05:47 -0700979 time_after(jiffies, lp->last_recon + HZ * 10)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 if (lp->network_down)
Joe Perchesa34c0932015-05-05 10:05:55 -0700981 arc_printk(D_NORMAL, dev, "cabling restored?\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 lp->first_recon = lp->last_recon = 0;
983 lp->num_recons = lp->network_down = 0;
984
Joe Perchesa34c0932015-05-05 10:05:55 -0700985 arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n");
Michael Grzeschik59fbcbc2015-09-16 10:15:45 +0200986 netif_carrier_on(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 }
988
Joe Perches7f5e7602015-05-05 10:05:49 -0700989 if (didsomething)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 retval |= IRQ_HANDLED;
Joe Perches7f5e7602015-05-05 10:05:49 -0700991 } while (--boguscount && didsomething);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
Joe Perchesa34c0932015-05-05 10:05:55 -0700993 arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
Joe Perchese15b0362015-05-05 10:06:12 -0700994 lp->hw.status(dev), boguscount);
Joe Perchesa34c0932015-05-05 10:05:55 -0700995 arc_printk(D_DURING, dev, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996
Joe Perchese15b0362015-05-05 10:06:12 -0700997 lp->hw.intmask(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 udelay(1);
Joe Perchese15b0362015-05-05 10:06:12 -0700999 lp->hw.intmask(dev, lp->intmask);
Joe Perchescb334642015-05-05 10:05:47 -07001000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 spin_unlock(&lp->lock);
1002 return retval;
1003}
Joe Perches811eafc2015-05-05 10:05:57 -07001004EXPORT_SYMBOL(arcnet_interrupt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
Joe Perchesf2f0a162015-05-05 10:05:52 -07001006/* This is a generic packet receiver that calls arcnet??_rx depending on the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 * protocol ID found.
1008 */
Adrian Bunkf03aa2d2006-01-14 03:10:22 +01001009static void arcnet_rx(struct net_device *dev, int bufnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010{
Wang Chen454d7c92008-11-12 23:37:49 -08001011 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 struct archdr pkt;
1013 struct arc_rfc1201 *soft;
1014 int length, ofs;
1015
1016 soft = &pkt.soft.rfc1201;
1017
Dan Carpenter087d2732013-07-19 08:48:05 +03001018 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 if (pkt.hard.offset[0]) {
1020 ofs = pkt.hard.offset[0];
1021 length = 256 - ofs;
1022 } else {
1023 ofs = pkt.hard.offset[1];
1024 length = 512 - ofs;
1025 }
1026
1027 /* get the full header, if possible */
Joe Perches7f5e7602015-05-05 10:05:49 -07001028 if (sizeof(pkt.soft) <= length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
Joe Perches7f5e7602015-05-05 10:05:49 -07001030 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 memset(&pkt.soft, 0, sizeof(pkt.soft));
1032 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
1033 }
1034
Joe Perchesa34c0932015-05-05 10:05:55 -07001035 arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n",
1036 bufnum, pkt.hard.source, pkt.hard.dest, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
Stephen Hemminger5803c512009-01-09 13:01:08 +00001038 dev->stats.rx_packets++;
1039 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
1041 /* call the right receiver for the protocol */
1042 if (arc_proto_map[soft->proto]->is_ip) {
Joe Perches72aeea42015-05-05 10:05:54 -07001043 if (BUGLVL(D_PROTO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 struct ArcProto
1045 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
1046 *newp = arc_proto_map[soft->proto];
1047
1048 if (oldp != newp) {
Joe Perchesa34c0932015-05-05 10:05:55 -07001049 arc_printk(D_PROTO, dev,
1050 "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n",
1051 soft->proto, pkt.hard.source,
1052 newp->suffix, oldp->suffix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 }
1054 }
1055
1056 /* broadcasts will always be done with the last-used encap. */
1057 lp->default_proto[0] = soft->proto;
1058
1059 /* in striking contrast, the following isn't a hack. */
1060 lp->default_proto[pkt.hard.source] = soft->proto;
1061 }
1062 /* call the protocol-specific receiver. */
1063 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1064}
1065
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066static void null_rx(struct net_device *dev, int bufnum,
1067 struct archdr *pkthdr, int length)
1068{
Joe Perchesa34c0932015-05-05 10:05:55 -07001069 arc_printk(D_PROTO, dev,
1070 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1071 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072}
1073
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1075 unsigned short type, uint8_t daddr)
1076{
Wang Chen454d7c92008-11-12 23:37:49 -08001077 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
Joe Perchesa34c0932015-05-05 10:05:55 -07001079 arc_printk(D_PROTO, dev,
1080 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1081 lp->default_proto[daddr]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
1083 /* always fails */
1084 return 0;
1085}
1086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087/* the "do nothing" prepare_tx function warns that there's nothing to do. */
1088static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1089 int length, int bufnum)
1090{
Wang Chen454d7c92008-11-12 23:37:49 -08001091 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 struct arc_hardware newpkt;
1093
Joe Perchesa34c0932015-05-05 10:05:55 -07001094 arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
1096 /* send a packet to myself -- will never get received, of course */
1097 newpkt.source = newpkt.dest = dev->dev_addr[0];
1098
1099 /* only one byte of actual data (and it's random) */
1100 newpkt.offset[0] = 0xFF;
1101
1102 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1103
1104 return 1; /* done */
1105}