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1/*
2 * ASIX AX8817X based USB 2.0 Ethernet Devices
3 * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com>
4 * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
5 * Copyright (C) 2006 James Painter <jamie.painter@iname.com>
6 * Copyright (c) 2002-2003 TiVo Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include "asix.h"
23
24int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
25 u16 size, void *data)
26{
27 int ret;
28 ret = usbnet_read_cmd(dev, cmd,
29 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
30 value, index, data, size);
31
32 if (ret != size && ret >= 0)
33 return -EINVAL;
34 return ret;
35}
36
37int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
38 u16 size, void *data)
39{
40 return usbnet_write_cmd(dev, cmd,
41 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
42 value, index, data, size);
43}
44
45void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
46 u16 size, void *data)
47{
48 usbnet_write_cmd_async(dev, cmd,
49 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
50 value, index, data, size);
51}
52
53int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
54 struct asix_rx_fixup_info *rx)
55{
56 int offset = 0;
57
58 while (offset + sizeof(u16) <= skb->len) {
59 u16 remaining = 0;
60 unsigned char *data;
61
62 if (!rx->size) {
63 if ((skb->len - offset == sizeof(u16)) ||
64 rx->split_head) {
65 if(!rx->split_head) {
66 rx->header = get_unaligned_le16(
67 skb->data + offset);
68 rx->split_head = true;
69 offset += sizeof(u16);
70 break;
71 } else {
72 rx->header |= (get_unaligned_le16(
73 skb->data + offset)
74 << 16);
75 rx->split_head = false;
76 offset += sizeof(u16);
77 }
78 } else {
79 rx->header = get_unaligned_le32(skb->data +
80 offset);
81 offset += sizeof(u32);
82 }
83
84 /* get the packet length */
85 rx->size = (u16) (rx->header & 0x7ff);
86 if (rx->size != ((~rx->header >> 16) & 0x7ff)) {
87 netdev_err(dev->net, "asix_rx_fixup() Bad Header Length 0x%x, offset %d\n",
88 rx->header, offset);
89 rx->size = 0;
90 return 0;
91 }
92 rx->ax_skb = netdev_alloc_skb_ip_align(dev->net,
93 rx->size);
94 if (!rx->ax_skb)
95 return 0;
96 }
97
98 if (rx->size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {
99 netdev_err(dev->net, "asix_rx_fixup() Bad RX Length %d\n",
100 rx->size);
101 kfree_skb(rx->ax_skb);
102 rx->ax_skb = NULL;
103 rx->size = 0U;
104
105 return 0;
106 }
107
108 if (rx->size > skb->len - offset) {
109 remaining = rx->size - (skb->len - offset);
110 rx->size = skb->len - offset;
111 }
112
113 data = skb_put(rx->ax_skb, rx->size);
114 memcpy(data, skb->data + offset, rx->size);
115 if (!remaining)
116 usbnet_skb_return(dev, rx->ax_skb);
117
118 offset += (rx->size + 1) & 0xfffe;
119 rx->size = remaining;
120 }
121
122 if (skb->len != offset) {
123 netdev_err(dev->net, "asix_rx_fixup() Bad SKB Length %d, %d\n",
124 skb->len, offset);
125 return 0;
126 }
127
128 return 1;
129}
130
131int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
132{
133 struct asix_common_private *dp = dev->driver_priv;
134 struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
135
136 return asix_rx_fixup_internal(dev, skb, rx);
137}
138
139struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
140 gfp_t flags)
141{
142 int padlen;
143 int headroom = skb_headroom(skb);
144 int tailroom = skb_tailroom(skb);
145 u32 packet_len;
146 u32 padbytes = 0xffff0000;
147
148 padlen = ((skb->len + 4) & (dev->maxpacket - 1)) ? 0 : 4;
149
150 /* We need to push 4 bytes in front of frame (packet_len)
151 * and maybe add 4 bytes after the end (if padlen is 4)
152 *
153 * Avoid skb_copy_expand() expensive call, using following rules :
154 * - We are allowed to push 4 bytes in headroom if skb_header_cloned()
155 * is false (and if we have 4 bytes of headroom)
156 * - We are allowed to put 4 bytes at tail if skb_cloned()
157 * is false (and if we have 4 bytes of tailroom)
158 *
159 * TCP packets for example are cloned, but skb_header_release()
160 * was called in tcp stack, allowing us to use headroom for our needs.
161 */
162 if (!skb_header_cloned(skb) &&
163 !(padlen && skb_cloned(skb)) &&
164 headroom + tailroom >= 4 + padlen) {
165 /* following should not happen, but better be safe */
166 if (headroom < 4 ||
167 tailroom < padlen) {
168 skb->data = memmove(skb->head + 4, skb->data, skb->len);
169 skb_set_tail_pointer(skb, skb->len);
170 }
171 } else {
172 struct sk_buff *skb2;
173
174 skb2 = skb_copy_expand(skb, 4, padlen, flags);
175 dev_kfree_skb_any(skb);
176 skb = skb2;
177 if (!skb)
178 return NULL;
179 }
180
181 packet_len = ((skb->len ^ 0x0000ffff) << 16) + skb->len;
182 skb_push(skb, 4);
183 cpu_to_le32s(&packet_len);
184 skb_copy_to_linear_data(skb, &packet_len, sizeof(packet_len));
185
186 if (padlen) {
187 cpu_to_le32s(&padbytes);
188 memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
189 skb_put(skb, sizeof(padbytes));
190 }
191 return skb;
192}
193
194int asix_set_sw_mii(struct usbnet *dev)
195{
196 int ret;
197 ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
198 if (ret < 0)
199 netdev_err(dev->net, "Failed to enable software MII access\n");
200 return ret;
201}
202
203int asix_set_hw_mii(struct usbnet *dev)
204{
205 int ret;
206 ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
207 if (ret < 0)
208 netdev_err(dev->net, "Failed to enable hardware MII access\n");
209 return ret;
210}
211
212int asix_read_phy_addr(struct usbnet *dev, int internal)
213{
214 int offset = (internal ? 1 : 0);
215 u8 buf[2];
216 int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);
217
218 netdev_dbg(dev->net, "asix_get_phy_addr()\n");
219
220 if (ret < 0) {
221 netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
222 goto out;
223 }
224 netdev_dbg(dev->net, "asix_get_phy_addr() returning 0x%04x\n",
225 *((__le16 *)buf));
226 ret = buf[offset];
227
228out:
229 return ret;
230}
231
232int asix_get_phy_addr(struct usbnet *dev)
233{
234 /* return the address of the internal phy */
235 return asix_read_phy_addr(dev, 1);
236}
237
238
239int asix_sw_reset(struct usbnet *dev, u8 flags)
240{
241 int ret;
242
243 ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
244 if (ret < 0)
245 netdev_err(dev->net, "Failed to send software reset: %02x\n", ret);
246
247 return ret;
248}
249
250u16 asix_read_rx_ctl(struct usbnet *dev)
251{
252 __le16 v;
253 int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);
254
255 if (ret < 0) {
256 netdev_err(dev->net, "Error reading RX_CTL register: %02x\n", ret);
257 goto out;
258 }
259 ret = le16_to_cpu(v);
260out:
261 return ret;
262}
263
264int asix_write_rx_ctl(struct usbnet *dev, u16 mode)
265{
266 int ret;
267
268 netdev_dbg(dev->net, "asix_write_rx_ctl() - mode = 0x%04x\n", mode);
269 ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
270 if (ret < 0)
271 netdev_err(dev->net, "Failed to write RX_CTL mode to 0x%04x: %02x\n",
272 mode, ret);
273
274 return ret;
275}
276
277u16 asix_read_medium_status(struct usbnet *dev)
278{
279 __le16 v;
280 int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);
281
282 if (ret < 0) {
283 netdev_err(dev->net, "Error reading Medium Status register: %02x\n",
284 ret);
285 return ret; /* TODO: callers not checking for error ret */
286 }
287
288 return le16_to_cpu(v);
289
290}
291
292int asix_write_medium_mode(struct usbnet *dev, u16 mode)
293{
294 int ret;
295
296 netdev_dbg(dev->net, "asix_write_medium_mode() - mode = 0x%04x\n", mode);
297 ret = asix_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE, mode, 0, 0, NULL);
298 if (ret < 0)
299 netdev_err(dev->net, "Failed to write Medium Mode mode to 0x%04x: %02x\n",
300 mode, ret);
301
302 return ret;
303}
304
305int asix_write_gpio(struct usbnet *dev, u16 value, int sleep)
306{
307 int ret;
308
309 netdev_dbg(dev->net, "asix_write_gpio() - value = 0x%04x\n", value);
310 ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS, value, 0, 0, NULL);
311 if (ret < 0)
312 netdev_err(dev->net, "Failed to write GPIO value 0x%04x: %02x\n",
313 value, ret);
314
315 if (sleep)
316 msleep(sleep);
317
318 return ret;
319}
320
321/*
322 * AX88772 & AX88178 have a 16-bit RX_CTL value
323 */
324void asix_set_multicast(struct net_device *net)
325{
326 struct usbnet *dev = netdev_priv(net);
327 struct asix_data *data = (struct asix_data *)&dev->data;
328 u16 rx_ctl = AX_DEFAULT_RX_CTL;
329
330 if (net->flags & IFF_PROMISC) {
331 rx_ctl |= AX_RX_CTL_PRO;
332 } else if (net->flags & IFF_ALLMULTI ||
333 netdev_mc_count(net) > AX_MAX_MCAST) {
334 rx_ctl |= AX_RX_CTL_AMALL;
335 } else if (netdev_mc_empty(net)) {
336 /* just broadcast and directed */
337 } else {
338 /* We use the 20 byte dev->data
339 * for our 8 byte filter buffer
340 * to avoid allocating memory that
341 * is tricky to free later */
342 struct netdev_hw_addr *ha;
343 u32 crc_bits;
344
345 memset(data->multi_filter, 0, AX_MCAST_FILTER_SIZE);
346
347 /* Build the multicast hash filter. */
348 netdev_for_each_mc_addr(ha, net) {
349 crc_bits = ether_crc(ETH_ALEN, ha->addr) >> 26;
350 data->multi_filter[crc_bits >> 3] |=
351 1 << (crc_bits & 7);
352 }
353
354 asix_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
355 AX_MCAST_FILTER_SIZE, data->multi_filter);
356
357 rx_ctl |= AX_RX_CTL_AM;
358 }
359
360 asix_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
361}
362
363int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
364{
365 struct usbnet *dev = netdev_priv(netdev);
366 __le16 res;
367
368 mutex_lock(&dev->phy_mutex);
369 asix_set_sw_mii(dev);
370 asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
371 (__u16)loc, 2, &res);
372 asix_set_hw_mii(dev);
373 mutex_unlock(&dev->phy_mutex);
374
375 netdev_dbg(dev->net, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
376 phy_id, loc, le16_to_cpu(res));
377
378 return le16_to_cpu(res);
379}
380
381void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
382{
383 struct usbnet *dev = netdev_priv(netdev);
384 __le16 res = cpu_to_le16(val);
385
386 netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
387 phy_id, loc, val);
388 mutex_lock(&dev->phy_mutex);
389 asix_set_sw_mii(dev);
390 asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
391 asix_set_hw_mii(dev);
392 mutex_unlock(&dev->phy_mutex);
393}
394
395void asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
396{
397 struct usbnet *dev = netdev_priv(net);
398 u8 opt;
399
400 if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE, 0, 0, 1, &opt) < 0) {
401 wolinfo->supported = 0;
402 wolinfo->wolopts = 0;
403 return;
404 }
405 wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
406 wolinfo->wolopts = 0;
407 if (opt & AX_MONITOR_LINK)
408 wolinfo->wolopts |= WAKE_PHY;
409 if (opt & AX_MONITOR_MAGIC)
410 wolinfo->wolopts |= WAKE_MAGIC;
411}
412
413int asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
414{
415 struct usbnet *dev = netdev_priv(net);
416 u8 opt = 0;
417
418 if (wolinfo->wolopts & WAKE_PHY)
419 opt |= AX_MONITOR_LINK;
420 if (wolinfo->wolopts & WAKE_MAGIC)
421 opt |= AX_MONITOR_MAGIC;
422
423 if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
424 opt, 0, 0, NULL) < 0)
425 return -EINVAL;
426
427 return 0;
428}
429
430int asix_get_eeprom_len(struct net_device *net)
431{
432 return AX_EEPROM_LEN;
433}
434
435int asix_get_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
436 u8 *data)
437{
438 struct usbnet *dev = netdev_priv(net);
439 u16 *eeprom_buff;
440 int first_word, last_word;
441 int i;
442
443 if (eeprom->len == 0)
444 return -EINVAL;
445
446 eeprom->magic = AX_EEPROM_MAGIC;
447
448 first_word = eeprom->offset >> 1;
449 last_word = (eeprom->offset + eeprom->len - 1) >> 1;
450
451 eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
452 GFP_KERNEL);
453 if (!eeprom_buff)
454 return -ENOMEM;
455
456 /* ax8817x returns 2 bytes from eeprom on read */
457 for (i = first_word; i <= last_word; i++) {
458 if (asix_read_cmd(dev, AX_CMD_READ_EEPROM, i, 0, 2,
459 &(eeprom_buff[i - first_word])) < 0) {
460 kfree(eeprom_buff);
461 return -EIO;
462 }
463 }
464
465 memcpy(data, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
466 kfree(eeprom_buff);
467 return 0;
468}
469
470int asix_set_eeprom(struct net_device *net, struct ethtool_eeprom *eeprom,
471 u8 *data)
472{
473 struct usbnet *dev = netdev_priv(net);
474 u16 *eeprom_buff;
475 int first_word, last_word;
476 int i;
477 int ret;
478
479 netdev_dbg(net, "write EEPROM len %d, offset %d, magic 0x%x\n",
480 eeprom->len, eeprom->offset, eeprom->magic);
481
482 if (eeprom->len == 0)
483 return -EINVAL;
484
485 if (eeprom->magic != AX_EEPROM_MAGIC)
486 return -EINVAL;
487
488 first_word = eeprom->offset >> 1;
489 last_word = (eeprom->offset + eeprom->len - 1) >> 1;
490
491 eeprom_buff = kmalloc(sizeof(u16) * (last_word - first_word + 1),
492 GFP_KERNEL);
493 if (!eeprom_buff)
494 return -ENOMEM;
495
496 /* align data to 16 bit boundaries, read the missing data from
497 the EEPROM */
498 if (eeprom->offset & 1) {
499 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, first_word, 0, 2,
500 &(eeprom_buff[0]));
501 if (ret < 0) {
502 netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", first_word);
503 goto free;
504 }
505 }
506
507 if ((eeprom->offset + eeprom->len) & 1) {
508 ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, last_word, 0, 2,
509 &(eeprom_buff[last_word - first_word]));
510 if (ret < 0) {
511 netdev_err(net, "Failed to read EEPROM at offset 0x%02x.\n", last_word);
512 goto free;
513 }
514 }
515
516 memcpy((u8 *)eeprom_buff + (eeprom->offset & 1), data, eeprom->len);
517
518 /* write data to EEPROM */
519 ret = asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0x0000, 0, 0, NULL);
520 if (ret < 0) {
521 netdev_err(net, "Failed to enable EEPROM write\n");
522 goto free;
523 }
524 msleep(20);
525
526 for (i = first_word; i <= last_word; i++) {
527 netdev_dbg(net, "write to EEPROM at offset 0x%02x, data 0x%04x\n",
528 i, eeprom_buff[i - first_word]);
529 ret = asix_write_cmd(dev, AX_CMD_WRITE_EEPROM, i,
530 eeprom_buff[i - first_word], 0, NULL);
531 if (ret < 0) {
532 netdev_err(net, "Failed to write EEPROM at offset 0x%02x.\n",
533 i);
534 goto free;
535 }
536 msleep(20);
537 }
538
539 ret = asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0x0000, 0, 0, NULL);
540 if (ret < 0) {
541 netdev_err(net, "Failed to disable EEPROM write\n");
542 goto free;
543 }
544
545 ret = 0;
546free:
547 kfree(eeprom_buff);
548 return ret;
549}
550
551void asix_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
552{
553 /* Inherit standard device info */
554 usbnet_get_drvinfo(net, info);
555 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
556 strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
557 info->eedump_len = AX_EEPROM_LEN;
558}
559
560int asix_set_mac_address(struct net_device *net, void *p)
561{
562 struct usbnet *dev = netdev_priv(net);
563 struct asix_data *data = (struct asix_data *)&dev->data;
564 struct sockaddr *addr = p;
565
566 if (netif_running(net))
567 return -EBUSY;
568 if (!is_valid_ether_addr(addr->sa_data))
569 return -EADDRNOTAVAIL;
570
571 memcpy(net->dev_addr, addr->sa_data, ETH_ALEN);
572
573 /* We use the 20 byte dev->data
574 * for our 6 byte mac buffer
575 * to avoid allocating memory that
576 * is tricky to free later */
577 memcpy(data->mac_addr, addr->sa_data, ETH_ALEN);
578 asix_write_cmd_async(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
579 data->mac_addr);
580
581 return 0;
582}