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Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / net / usb / smsc75xx.c
blob15b3d6888ae9b1997d3c4f09b8968baacef782cc
1 /***************************************************************************
2 *
3 * Copyright (C) 2007-2010 SMSC
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 *
19 *****************************************************************************/
20
21 #include <linux/module.h>
22 #include <linux/kmod.h>
23 #include <linux/init.h>
24 #include <linux/netdevice.h>
25 #include <linux/etherdevice.h>
26 #include <linux/ethtool.h>
27 #include <linux/mii.h>
28 #include <linux/usb.h>
29 #include <linux/crc32.h>
30 #include <linux/usb/usbnet.h>
31 #include <linux/slab.h>
32 #include "smsc75xx.h"
33
34 #define SMSC_CHIPNAME "smsc75xx"
35 #define SMSC_DRIVER_VERSION "1.0.0"
36 #define HS_USB_PKT_SIZE (512)
37 #define FS_USB_PKT_SIZE (64)
38 #define DEFAULT_HS_BURST_CAP_SIZE (16 * 1024 + 5 * HS_USB_PKT_SIZE)
39 #define DEFAULT_FS_BURST_CAP_SIZE (6 * 1024 + 33 * FS_USB_PKT_SIZE)
40 #define DEFAULT_BULK_IN_DELAY (0x00002000)
41 #define MAX_SINGLE_PACKET_SIZE (9000)
42 #define LAN75XX_EEPROM_MAGIC (0x7500)
43 #define EEPROM_MAC_OFFSET (0x01)
44 #define DEFAULT_TX_CSUM_ENABLE (true)
45 #define DEFAULT_RX_CSUM_ENABLE (true)
46 #define DEFAULT_TSO_ENABLE (true)
47 #define SMSC75XX_INTERNAL_PHY_ID (1)
48 #define SMSC75XX_TX_OVERHEAD (8)
49 #define MAX_RX_FIFO_SIZE (20 * 1024)
50 #define MAX_TX_FIFO_SIZE (12 * 1024)
51 #define USB_VENDOR_ID_SMSC (0x0424)
52 #define USB_PRODUCT_ID_LAN7500 (0x7500)
53 #define USB_PRODUCT_ID_LAN7505 (0x7505)
54
55 #define check_warn(ret, fmt, args...) \
56 ({ if (ret < 0) netdev_warn(dev->net, fmt, ##args); })
57
58 #define check_warn_return(ret, fmt, args...) \
59 ({ if (ret < 0) { netdev_warn(dev->net, fmt, ##args); return ret; } })
60
61 #define check_warn_goto_done(ret, fmt, args...) \
62 ({ if (ret < 0) { netdev_warn(dev->net, fmt, ##args); goto done; } })
63
64 struct smsc75xx_priv {
65 struct usbnet *dev;
66 u32 rfe_ctl;
67 u32 multicast_hash_table[DP_SEL_VHF_HASH_LEN];
68 struct mutex dataport_mutex;
69 spinlock_t rfe_ctl_lock;
70 struct work_struct set_multicast;
71 };
72
73 struct usb_context {
74 struct usb_ctrlrequest req;
75 struct usbnet *dev;
76 };
77
78 static int turbo_mode = true;
79 module_param(turbo_mode, bool, 0644);
80 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
81
82 static int __must_check smsc75xx_read_reg(struct usbnet *dev, u32 index,
83 u32 *data)
84 {
85 u32 *buf = kmalloc(4, GFP_KERNEL);
86 int ret;
87
88 BUG_ON(!dev);
89
90 if (!buf)
91 return -ENOMEM;
92
93 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
94 USB_VENDOR_REQUEST_READ_REGISTER,
95 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
96 00, index, buf, 4, USB_CTRL_GET_TIMEOUT);
97
98 if (unlikely(ret < 0))
99 netdev_warn(dev->net,
100 "Failed to read register index 0x%08x", index);
101
102 le32_to_cpus(buf);
103 *data = *buf;
104 kfree(buf);
105
106 return ret;
107 }
108
109 static int __must_check smsc75xx_write_reg(struct usbnet *dev, u32 index,
110 u32 data)
111 {
112 u32 *buf = kmalloc(4, GFP_KERNEL);
113 int ret;
114
115 BUG_ON(!dev);
116
117 if (!buf)
118 return -ENOMEM;
119
120 *buf = data;
121 cpu_to_le32s(buf);
122
123 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
124 USB_VENDOR_REQUEST_WRITE_REGISTER,
125 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
126 00, index, buf, 4, USB_CTRL_SET_TIMEOUT);
127
128 if (unlikely(ret < 0))
129 netdev_warn(dev->net,
130 "Failed to write register index 0x%08x", index);
131
132 kfree(buf);
133
134 return ret;
135 }
136
137 /* Loop until the read is completed with timeout
138 * called with phy_mutex held */
139 static int smsc75xx_phy_wait_not_busy(struct usbnet *dev)
140 {
141 unsigned long start_time = jiffies;
142 u32 val;
143 int ret;
144
145 do {
146 ret = smsc75xx_read_reg(dev, MII_ACCESS, &val);
147 check_warn_return(ret, "Error reading MII_ACCESS");
148
149 if (!(val & MII_ACCESS_BUSY))
150 return 0;
151 } while (!time_after(jiffies, start_time + HZ));
152
153 return -EIO;
154 }
155
156 static int smsc75xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
157 {
158 struct usbnet *dev = netdev_priv(netdev);
159 u32 val, addr;
160 int ret;
161
162 mutex_lock(&dev->phy_mutex);
163
164 /* confirm MII not busy */
165 ret = smsc75xx_phy_wait_not_busy(dev);
166 check_warn_goto_done(ret, "MII is busy in smsc75xx_mdio_read");
167
168 /* set the address, index & direction (read from PHY) */
169 phy_id &= dev->mii.phy_id_mask;
170 idx &= dev->mii.reg_num_mask;
171 addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
172 | ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)
173 | MII_ACCESS_READ;
174 ret = smsc75xx_write_reg(dev, MII_ACCESS, addr);
175 check_warn_goto_done(ret, "Error writing MII_ACCESS");
176
177 ret = smsc75xx_phy_wait_not_busy(dev);
178 check_warn_goto_done(ret, "Timed out reading MII reg %02X", idx);
179
180 ret = smsc75xx_read_reg(dev, MII_DATA, &val);
181 check_warn_goto_done(ret, "Error reading MII_DATA");
182
183 ret = (u16)(val & 0xFFFF);
184
185 done:
186 mutex_unlock(&dev->phy_mutex);
187 return ret;
188 }
189
190 static void smsc75xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
191 int regval)
192 {
193 struct usbnet *dev = netdev_priv(netdev);
194 u32 val, addr;
195 int ret;
196
197 mutex_lock(&dev->phy_mutex);
198
199 /* confirm MII not busy */
200 ret = smsc75xx_phy_wait_not_busy(dev);
201 check_warn_goto_done(ret, "MII is busy in smsc75xx_mdio_write");
202
203 val = regval;
204 ret = smsc75xx_write_reg(dev, MII_DATA, val);
205 check_warn_goto_done(ret, "Error writing MII_DATA");
206
207 /* set the address, index & direction (write to PHY) */
208 phy_id &= dev->mii.phy_id_mask;
209 idx &= dev->mii.reg_num_mask;
210 addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
211 | ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)
212 | MII_ACCESS_WRITE;
213 ret = smsc75xx_write_reg(dev, MII_ACCESS, addr);
214 check_warn_goto_done(ret, "Error writing MII_ACCESS");
215
216 ret = smsc75xx_phy_wait_not_busy(dev);
217 check_warn_goto_done(ret, "Timed out writing MII reg %02X", idx);
218
219 done:
220 mutex_unlock(&dev->phy_mutex);
221 }
222
223 static int smsc75xx_wait_eeprom(struct usbnet *dev)
224 {
225 unsigned long start_time = jiffies;
226 u32 val;
227 int ret;
228
229 do {
230 ret = smsc75xx_read_reg(dev, E2P_CMD, &val);
231 check_warn_return(ret, "Error reading E2P_CMD");
232
233 if (!(val & E2P_CMD_BUSY) || (val & E2P_CMD_TIMEOUT))
234 break;
235 udelay(40);
236 } while (!time_after(jiffies, start_time + HZ));
237
238 if (val & (E2P_CMD_TIMEOUT | E2P_CMD_BUSY)) {
239 netdev_warn(dev->net, "EEPROM read operation timeout");
240 return -EIO;
241 }
242
243 return 0;
244 }
245
246 static int smsc75xx_eeprom_confirm_not_busy(struct usbnet *dev)
247 {
248 unsigned long start_time = jiffies;
249 u32 val;
250 int ret;
251
252 do {
253 ret = smsc75xx_read_reg(dev, E2P_CMD, &val);
254 check_warn_return(ret, "Error reading E2P_CMD");
255
256 if (!(val & E2P_CMD_BUSY))
257 return 0;
258
259 udelay(40);
260 } while (!time_after(jiffies, start_time + HZ));
261
262 netdev_warn(dev->net, "EEPROM is busy");
263 return -EIO;
264 }
265
266 static int smsc75xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
267 u8 *data)
268 {
269 u32 val;
270 int i, ret;
271
272 BUG_ON(!dev);
273 BUG_ON(!data);
274
275 ret = smsc75xx_eeprom_confirm_not_busy(dev);
276 if (ret)
277 return ret;
278
279 for (i = 0; i < length; i++) {
280 val = E2P_CMD_BUSY | E2P_CMD_READ | (offset & E2P_CMD_ADDR);
281 ret = smsc75xx_write_reg(dev, E2P_CMD, val);
282 check_warn_return(ret, "Error writing E2P_CMD");
283
284 ret = smsc75xx_wait_eeprom(dev);
285 if (ret < 0)
286 return ret;
287
288 ret = smsc75xx_read_reg(dev, E2P_DATA, &val);
289 check_warn_return(ret, "Error reading E2P_DATA");
290
291 data[i] = val & 0xFF;
292 offset++;
293 }
294
295 return 0;
296 }
297
298 static int smsc75xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
299 u8 *data)
300 {
301 u32 val;
302 int i, ret;
303
304 BUG_ON(!dev);
305 BUG_ON(!data);
306
307 ret = smsc75xx_eeprom_confirm_not_busy(dev);
308 if (ret)
309 return ret;
310
311 /* Issue write/erase enable command */
312 val = E2P_CMD_BUSY | E2P_CMD_EWEN;
313 ret = smsc75xx_write_reg(dev, E2P_CMD, val);
314 check_warn_return(ret, "Error writing E2P_CMD");
315
316 ret = smsc75xx_wait_eeprom(dev);
317 if (ret < 0)
318 return ret;
319
320 for (i = 0; i < length; i++) {
321
322 /* Fill data register */
323 val = data[i];
324 ret = smsc75xx_write_reg(dev, E2P_DATA, val);
325 check_warn_return(ret, "Error writing E2P_DATA");
326
327 /* Send "write" command */
328 val = E2P_CMD_BUSY | E2P_CMD_WRITE | (offset & E2P_CMD_ADDR);
329 ret = smsc75xx_write_reg(dev, E2P_CMD, val);
330 check_warn_return(ret, "Error writing E2P_CMD");
331
332 ret = smsc75xx_wait_eeprom(dev);
333 if (ret < 0)
334 return ret;
335
336 offset++;
337 }
338
339 return 0;
340 }
341
342 static int smsc75xx_dataport_wait_not_busy(struct usbnet *dev)
343 {
344 int i, ret;
345
346 for (i = 0; i < 100; i++) {
347 u32 dp_sel;
348 ret = smsc75xx_read_reg(dev, DP_SEL, &dp_sel);
349 check_warn_return(ret, "Error reading DP_SEL");
350
351 if (dp_sel & DP_SEL_DPRDY)
352 return 0;
353
354 udelay(40);
355 }
356
357 netdev_warn(dev->net, "smsc75xx_dataport_wait_not_busy timed out");
358
359 return -EIO;
360 }
361
362 static int smsc75xx_dataport_write(struct usbnet *dev, u32 ram_select, u32 addr,
363 u32 length, u32 *buf)
364 {
365 struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
366 u32 dp_sel;
367 int i, ret;
368
369 mutex_lock(&pdata->dataport_mutex);
370
371 ret = smsc75xx_dataport_wait_not_busy(dev);
372 check_warn_goto_done(ret, "smsc75xx_dataport_write busy on entry");
373
374 ret = smsc75xx_read_reg(dev, DP_SEL, &dp_sel);
375 check_warn_goto_done(ret, "Error reading DP_SEL");
376
377 dp_sel &= ~DP_SEL_RSEL;
378 dp_sel |= ram_select;
379 ret = smsc75xx_write_reg(dev, DP_SEL, dp_sel);
380 check_warn_goto_done(ret, "Error writing DP_SEL");
381
382 for (i = 0; i < length; i++) {
383 ret = smsc75xx_write_reg(dev, DP_ADDR, addr + i);
384 check_warn_goto_done(ret, "Error writing DP_ADDR");
385
386 ret = smsc75xx_write_reg(dev, DP_DATA, buf[i]);
387 check_warn_goto_done(ret, "Error writing DP_DATA");
388
389 ret = smsc75xx_write_reg(dev, DP_CMD, DP_CMD_WRITE);
390 check_warn_goto_done(ret, "Error writing DP_CMD");
391
392 ret = smsc75xx_dataport_wait_not_busy(dev);
393 check_warn_goto_done(ret, "smsc75xx_dataport_write timeout");
394 }
395
396 done:
397 mutex_unlock(&pdata->dataport_mutex);
398 return ret;
399 }
400
401 /* returns hash bit number for given MAC address */
402 static u32 smsc75xx_hash(char addr[ETH_ALEN])
403 {
404 return (ether_crc(ETH_ALEN, addr) >> 23) & 0x1ff;
405 }
406
407 static void smsc75xx_deferred_multicast_write(struct work_struct *param)
408 {
409 struct smsc75xx_priv *pdata =
410 container_of(param, struct smsc75xx_priv, set_multicast);
411 struct usbnet *dev = pdata->dev;
412 int ret;
413
414 netif_dbg(dev, drv, dev->net, "deferred multicast write 0x%08x",
415 pdata->rfe_ctl);
416
417 smsc75xx_dataport_write(dev, DP_SEL_VHF, DP_SEL_VHF_VLAN_LEN,
418 DP_SEL_VHF_HASH_LEN, pdata->multicast_hash_table);
419
420 ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
421 check_warn(ret, "Error writing RFE_CRL");
422 }
423
424 static void smsc75xx_set_multicast(struct net_device *netdev)
425 {
426 struct usbnet *dev = netdev_priv(netdev);
427 struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
428 unsigned long flags;
429 int i;
430
431 spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);
432
433 pdata->rfe_ctl &=
434 ~(RFE_CTL_AU | RFE_CTL_AM | RFE_CTL_DPF | RFE_CTL_MHF);
435 pdata->rfe_ctl |= RFE_CTL_AB;
436
437 for (i = 0; i < DP_SEL_VHF_HASH_LEN; i++)
438 pdata->multicast_hash_table[i] = 0;
439
440 if (dev->net->flags & IFF_PROMISC) {
441 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled");
442 pdata->rfe_ctl |= RFE_CTL_AM | RFE_CTL_AU;
443 } else if (dev->net->flags & IFF_ALLMULTI) {
444 netif_dbg(dev, drv, dev->net, "receive all multicast enabled");
445 pdata->rfe_ctl |= RFE_CTL_AM | RFE_CTL_DPF;
446 } else if (!netdev_mc_empty(dev->net)) {
447 struct netdev_hw_addr *ha;
448
449 netif_dbg(dev, drv, dev->net, "receive multicast hash filter");
450
451 pdata->rfe_ctl |= RFE_CTL_MHF | RFE_CTL_DPF;
452
453 netdev_for_each_mc_addr(ha, netdev) {
454 u32 bitnum = smsc75xx_hash(ha->addr);
455 pdata->multicast_hash_table[bitnum / 32] |=
456 (1 << (bitnum % 32));
457 }
458 } else {
459 netif_dbg(dev, drv, dev->net, "receive own packets only");
460 pdata->rfe_ctl |= RFE_CTL_DPF;
461 }
462
463 spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);
464
465 /* defer register writes to a sleepable context */
466 schedule_work(&pdata->set_multicast);
467 }
468
469 static int smsc75xx_update_flowcontrol(struct usbnet *dev, u8 duplex,
470 u16 lcladv, u16 rmtadv)
471 {
472 u32 flow = 0, fct_flow = 0;
473 int ret;
474
475 if (duplex == DUPLEX_FULL) {
476 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
477
478 if (cap & FLOW_CTRL_TX) {
479 flow = (FLOW_TX_FCEN | 0xFFFF);
480 /* set fct_flow thresholds to 20% and 80% */
481 fct_flow = (8 << 8) | 32;
482 }
483
484 if (cap & FLOW_CTRL_RX)
485 flow |= FLOW_RX_FCEN;
486
487 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s",
488 (cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
489 (cap & FLOW_CTRL_TX ? "enabled" : "disabled"));
490 } else {
491 netif_dbg(dev, link, dev->net, "half duplex");
492 }
493
494 ret = smsc75xx_write_reg(dev, FLOW, flow);
495 check_warn_return(ret, "Error writing FLOW");
496
497 ret = smsc75xx_write_reg(dev, FCT_FLOW, fct_flow);
498 check_warn_return(ret, "Error writing FCT_FLOW");
499
500 return 0;
501 }
502
503 static int smsc75xx_link_reset(struct usbnet *dev)
504 {
505 struct mii_if_info *mii = &dev->mii;
506 struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
507 u16 lcladv, rmtadv;
508 int ret;
509
510 /* clear interrupt status */
511 ret = smsc75xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
512 check_warn_return(ret, "Error reading PHY_INT_SRC");
513
514 ret = smsc75xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL);
515 check_warn_return(ret, "Error writing INT_STS");
516
517 mii_check_media(mii, 1, 1);
518 mii_ethtool_gset(&dev->mii, &ecmd);
519 lcladv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
520 rmtadv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
521
522 netif_dbg(dev, link, dev->net, "speed: %u duplex: %d lcladv: %04x"
523 " rmtadv: %04x", ethtool_cmd_speed(&ecmd),
524 ecmd.duplex, lcladv, rmtadv);
525
526 return smsc75xx_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
527 }
528
529 static void smsc75xx_status(struct usbnet *dev, struct urb *urb)
530 {
531 u32 intdata;
532
533 if (urb->actual_length != 4) {
534 netdev_warn(dev->net,
535 "unexpected urb length %d", urb->actual_length);
536 return;
537 }
538
539 memcpy(&intdata, urb->transfer_buffer, 4);
540 le32_to_cpus(&intdata);
541
542 netif_dbg(dev, link, dev->net, "intdata: 0x%08X", intdata);
543
544 if (intdata & INT_ENP_PHY_INT)
545 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
546 else
547 netdev_warn(dev->net,
548 "unexpected interrupt, intdata=0x%08X", intdata);
549 }
550
551 static int smsc75xx_ethtool_get_eeprom_len(struct net_device *net)
552 {
553 return MAX_EEPROM_SIZE;
554 }
555
556 static int smsc75xx_ethtool_get_eeprom(struct net_device *netdev,
557 struct ethtool_eeprom *ee, u8 *data)
558 {
559 struct usbnet *dev = netdev_priv(netdev);
560
561 ee->magic = LAN75XX_EEPROM_MAGIC;
562
563 return smsc75xx_read_eeprom(dev, ee->offset, ee->len, data);
564 }
565
566 static int smsc75xx_ethtool_set_eeprom(struct net_device *netdev,
567 struct ethtool_eeprom *ee, u8 *data)
568 {
569 struct usbnet *dev = netdev_priv(netdev);
570
571 if (ee->magic != LAN75XX_EEPROM_MAGIC) {
572 netdev_warn(dev->net,
573 "EEPROM: magic value mismatch: 0x%x", ee->magic);
574 return -EINVAL;
575 }
576
577 return smsc75xx_write_eeprom(dev, ee->offset, ee->len, data);
578 }
579
580 static const struct ethtool_ops smsc75xx_ethtool_ops = {
581 .get_link = usbnet_get_link,
582 .nway_reset = usbnet_nway_reset,
583 .get_drvinfo = usbnet_get_drvinfo,
584 .get_msglevel = usbnet_get_msglevel,
585 .set_msglevel = usbnet_set_msglevel,
586 .get_settings = usbnet_get_settings,
587 .set_settings = usbnet_set_settings,
588 .get_eeprom_len = smsc75xx_ethtool_get_eeprom_len,
589 .get_eeprom = smsc75xx_ethtool_get_eeprom,
590 .set_eeprom = smsc75xx_ethtool_set_eeprom,
591 };
592
593 static int smsc75xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
594 {
595 struct usbnet *dev = netdev_priv(netdev);
596
597 if (!netif_running(netdev))
598 return -EINVAL;
599
600 return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
601 }
602
603 static void smsc75xx_init_mac_address(struct usbnet *dev)
604 {
605 /* try reading mac address from EEPROM */
606 if (smsc75xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
607 dev->net->dev_addr) == 0) {
608 if (is_valid_ether_addr(dev->net->dev_addr)) {
609 /* eeprom values are valid so use them */
610 netif_dbg(dev, ifup, dev->net,
611 "MAC address read from EEPROM");
612 return;
613 }
614 }
615
616 /* no eeprom, or eeprom values are invalid. generate random MAC */
617 random_ether_addr(dev->net->dev_addr);
618 netif_dbg(dev, ifup, dev->net, "MAC address set to random_ether_addr");
619 }
620
621 static int smsc75xx_set_mac_address(struct usbnet *dev)
622 {
623 u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
624 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
625 u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
626
627 int ret = smsc75xx_write_reg(dev, RX_ADDRH, addr_hi);
628 check_warn_return(ret, "Failed to write RX_ADDRH: %d", ret);
629
630 ret = smsc75xx_write_reg(dev, RX_ADDRL, addr_lo);
631 check_warn_return(ret, "Failed to write RX_ADDRL: %d", ret);
632
633 addr_hi |= ADDR_FILTX_FB_VALID;
634 ret = smsc75xx_write_reg(dev, ADDR_FILTX, addr_hi);
635 check_warn_return(ret, "Failed to write ADDR_FILTX: %d", ret);
636
637 ret = smsc75xx_write_reg(dev, ADDR_FILTX + 4, addr_lo);
638 check_warn_return(ret, "Failed to write ADDR_FILTX+4: %d", ret);
639
640 return 0;
641 }
642
643 static int smsc75xx_phy_initialize(struct usbnet *dev)
644 {
645 int bmcr, timeout = 0;
646
647 /* Initialize MII structure */
648 dev->mii.dev = dev->net;
649 dev->mii.mdio_read = smsc75xx_mdio_read;
650 dev->mii.mdio_write = smsc75xx_mdio_write;
651 dev->mii.phy_id_mask = 0x1f;
652 dev->mii.reg_num_mask = 0x1f;
653 dev->mii.phy_id = SMSC75XX_INTERNAL_PHY_ID;
654
655 /* reset phy and wait for reset to complete */
656 smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
657
658 do {
659 msleep(10);
660 bmcr = smsc75xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
661 check_warn_return(bmcr, "Error reading MII_BMCR");
662 timeout++;
663 } while ((bmcr & MII_BMCR) && (timeout < 100));
664
665 if (timeout >= 100) {
666 netdev_warn(dev->net, "timeout on PHY Reset");
667 return -EIO;
668 }
669
670 smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
671 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
672 ADVERTISE_PAUSE_ASYM);
673
674 /* read to clear */
675 smsc75xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
676 check_warn_return(bmcr, "Error reading PHY_INT_SRC");
677
678 smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
679 PHY_INT_MASK_DEFAULT);
680 mii_nway_restart(&dev->mii);
681
682 netif_dbg(dev, ifup, dev->net, "phy initialised successfully");
683 return 0;
684 }
685
686 static int smsc75xx_set_rx_max_frame_length(struct usbnet *dev, int size)
687 {
688 int ret = 0;
689 u32 buf;
690 bool rxenabled;
691
692 ret = smsc75xx_read_reg(dev, MAC_RX, &buf);
693 check_warn_return(ret, "Failed to read MAC_RX: %d", ret);
694
695 rxenabled = ((buf & MAC_RX_RXEN) != 0);
696
697 if (rxenabled) {
698 buf &= ~MAC_RX_RXEN;
699 ret = smsc75xx_write_reg(dev, MAC_RX, buf);
700 check_warn_return(ret, "Failed to write MAC_RX: %d", ret);
701 }
702
703 /* add 4 to size for FCS */
704 buf &= ~MAC_RX_MAX_SIZE;
705 buf |= (((size + 4) << MAC_RX_MAX_SIZE_SHIFT) & MAC_RX_MAX_SIZE);
706
707 ret = smsc75xx_write_reg(dev, MAC_RX, buf);
708 check_warn_return(ret, "Failed to write MAC_RX: %d", ret);
709
710 if (rxenabled) {
711 buf |= MAC_RX_RXEN;
712 ret = smsc75xx_write_reg(dev, MAC_RX, buf);
713 check_warn_return(ret, "Failed to write MAC_RX: %d", ret);
714 }
715
716 return 0;
717 }
718
719 static int smsc75xx_change_mtu(struct net_device *netdev, int new_mtu)
720 {
721 struct usbnet *dev = netdev_priv(netdev);
722
723 int ret = smsc75xx_set_rx_max_frame_length(dev, new_mtu);
724 check_warn_return(ret, "Failed to set mac rx frame length");
725
726 return usbnet_change_mtu(netdev, new_mtu);
727 }
728
729 /* Enable or disable Rx checksum offload engine */
730 static int smsc75xx_set_features(struct net_device *netdev, u32 features)
731 {
732 struct usbnet *dev = netdev_priv(netdev);
733 struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
734 unsigned long flags;
735 int ret;
736
737 spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);
738
739 if (features & NETIF_F_RXCSUM)
740 pdata->rfe_ctl |= RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM;
741 else
742 pdata->rfe_ctl &= ~(RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM);
743
744 spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);
745 /* it's racing here! */
746
747 ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
748 check_warn_return(ret, "Error writing RFE_CTL");
749
750 return 0;
751 }
752
753 static int smsc75xx_reset(struct usbnet *dev)
754 {
755 struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
756 u32 buf;
757 int ret = 0, timeout;
758
759 netif_dbg(dev, ifup, dev->net, "entering smsc75xx_reset");
760
761 ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
762 check_warn_return(ret, "Failed to read HW_CFG: %d", ret);
763
764 buf |= HW_CFG_LRST;
765
766 ret = smsc75xx_write_reg(dev, HW_CFG, buf);
767 check_warn_return(ret, "Failed to write HW_CFG: %d", ret);
768
769 timeout = 0;
770 do {
771 msleep(10);
772 ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
773 check_warn_return(ret, "Failed to read HW_CFG: %d", ret);
774 timeout++;
775 } while ((buf & HW_CFG_LRST) && (timeout < 100));
776
777 if (timeout >= 100) {
778 netdev_warn(dev->net, "timeout on completion of Lite Reset");
779 return -EIO;
780 }
781
782 netif_dbg(dev, ifup, dev->net, "Lite reset complete, resetting PHY");
783
784 ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
785 check_warn_return(ret, "Failed to read PMT_CTL: %d", ret);
786
787 buf |= PMT_CTL_PHY_RST;
788
789 ret = smsc75xx_write_reg(dev, PMT_CTL, buf);
790 check_warn_return(ret, "Failed to write PMT_CTL: %d", ret);
791
792 timeout = 0;
793 do {
794 msleep(10);
795 ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
796 check_warn_return(ret, "Failed to read PMT_CTL: %d", ret);
797 timeout++;
798 } while ((buf & PMT_CTL_PHY_RST) && (timeout < 100));
799
800 if (timeout >= 100) {
801 netdev_warn(dev->net, "timeout waiting for PHY Reset");
802 return -EIO;
803 }
804
805 netif_dbg(dev, ifup, dev->net, "PHY reset complete");
806
807 smsc75xx_init_mac_address(dev);
808
809 ret = smsc75xx_set_mac_address(dev);
810 check_warn_return(ret, "Failed to set mac address");
811
812 netif_dbg(dev, ifup, dev->net, "MAC Address: %pM", dev->net->dev_addr);
813
814 ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
815 check_warn_return(ret, "Failed to read HW_CFG: %d", ret);
816
817 netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x", buf);
818
819 buf |= HW_CFG_BIR;
820
821 ret = smsc75xx_write_reg(dev, HW_CFG, buf);
822 check_warn_return(ret, "Failed to write HW_CFG: %d", ret);
823
824 ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
825 check_warn_return(ret, "Failed to read HW_CFG: %d", ret);
826
827 netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG after "
828 "writing HW_CFG_BIR: 0x%08x", buf);
829
830 if (!turbo_mode) {
831 buf = 0;
832 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
833 } else if (dev->udev->speed == USB_SPEED_HIGH) {
834 buf = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
835 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
836 } else {
837 buf = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
838 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
839 }
840
841 netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld",
842 (ulong)dev->rx_urb_size);
843
844 ret = smsc75xx_write_reg(dev, BURST_CAP, buf);
845 check_warn_return(ret, "Failed to write BURST_CAP: %d", ret);
846
847 ret = smsc75xx_read_reg(dev, BURST_CAP, &buf);
848 check_warn_return(ret, "Failed to read BURST_CAP: %d", ret);
849
850 netif_dbg(dev, ifup, dev->net,
851 "Read Value from BURST_CAP after writing: 0x%08x", buf);
852
853 ret = smsc75xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
854 check_warn_return(ret, "Failed to write BULK_IN_DLY: %d", ret);
855
856 ret = smsc75xx_read_reg(dev, BULK_IN_DLY, &buf);
857 check_warn_return(ret, "Failed to read BULK_IN_DLY: %d", ret);
858
859 netif_dbg(dev, ifup, dev->net,
860 "Read Value from BULK_IN_DLY after writing: 0x%08x", buf);
861
862 if (turbo_mode) {
863 ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
864 check_warn_return(ret, "Failed to read HW_CFG: %d", ret);
865
866 netif_dbg(dev, ifup, dev->net, "HW_CFG: 0x%08x", buf);
867
868 buf |= (HW_CFG_MEF | HW_CFG_BCE);
869
870 ret = smsc75xx_write_reg(dev, HW_CFG, buf);
871 check_warn_return(ret, "Failed to write HW_CFG: %d", ret);
872
873 ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
874 check_warn_return(ret, "Failed to read HW_CFG: %d", ret);
875
876 netif_dbg(dev, ifup, dev->net, "HW_CFG: 0x%08x", buf);
877 }
878
879 /* set FIFO sizes */
880 buf = (MAX_RX_FIFO_SIZE - 512) / 512;
881 ret = smsc75xx_write_reg(dev, FCT_RX_FIFO_END, buf);
882 check_warn_return(ret, "Failed to write FCT_RX_FIFO_END: %d", ret);
883
884 netif_dbg(dev, ifup, dev->net, "FCT_RX_FIFO_END set to 0x%08x", buf);
885
886 buf = (MAX_TX_FIFO_SIZE - 512) / 512;
887 ret = smsc75xx_write_reg(dev, FCT_TX_FIFO_END, buf);
888 check_warn_return(ret, "Failed to write FCT_TX_FIFO_END: %d", ret);
889
890 netif_dbg(dev, ifup, dev->net, "FCT_TX_FIFO_END set to 0x%08x", buf);
891
892 ret = smsc75xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL);
893 check_warn_return(ret, "Failed to write INT_STS: %d", ret);
894
895 ret = smsc75xx_read_reg(dev, ID_REV, &buf);
896 check_warn_return(ret, "Failed to read ID_REV: %d", ret);
897
898 netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x", buf);
899
900 /* Configure GPIO pins as LED outputs */
901 ret = smsc75xx_read_reg(dev, LED_GPIO_CFG, &buf);
902 check_warn_return(ret, "Failed to read LED_GPIO_CFG: %d", ret);
903
904 buf &= ~(LED_GPIO_CFG_LED2_FUN_SEL | LED_GPIO_CFG_LED10_FUN_SEL);
905 buf |= LED_GPIO_CFG_LEDGPIO_EN | LED_GPIO_CFG_LED2_FUN_SEL;
906
907 ret = smsc75xx_write_reg(dev, LED_GPIO_CFG, buf);
908 check_warn_return(ret, "Failed to write LED_GPIO_CFG: %d", ret);
909
910 ret = smsc75xx_write_reg(dev, FLOW, 0);
911 check_warn_return(ret, "Failed to write FLOW: %d", ret);
912
913 ret = smsc75xx_write_reg(dev, FCT_FLOW, 0);
914 check_warn_return(ret, "Failed to write FCT_FLOW: %d", ret);
915
916 /* Don't need rfe_ctl_lock during initialisation */
917 ret = smsc75xx_read_reg(dev, RFE_CTL, &pdata->rfe_ctl);
918 check_warn_return(ret, "Failed to read RFE_CTL: %d", ret);
919
920 pdata->rfe_ctl |= RFE_CTL_AB | RFE_CTL_DPF;
921
922 ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
923 check_warn_return(ret, "Failed to write RFE_CTL: %d", ret);
924
925 ret = smsc75xx_read_reg(dev, RFE_CTL, &pdata->rfe_ctl);
926 check_warn_return(ret, "Failed to read RFE_CTL: %d", ret);
927
928 netif_dbg(dev, ifup, dev->net, "RFE_CTL set to 0x%08x", pdata->rfe_ctl);
929
930 /* Enable or disable checksum offload engines */
931 smsc75xx_set_features(dev->net, dev->net->features);
932
933 smsc75xx_set_multicast(dev->net);
934
935 ret = smsc75xx_phy_initialize(dev);
936 check_warn_return(ret, "Failed to initialize PHY: %d", ret);
937
938 ret = smsc75xx_read_reg(dev, INT_EP_CTL, &buf);
939 check_warn_return(ret, "Failed to read INT_EP_CTL: %d", ret);
940
941 /* enable PHY interrupts */
942 buf |= INT_ENP_PHY_INT;
943
944 ret = smsc75xx_write_reg(dev, INT_EP_CTL, buf);
945 check_warn_return(ret, "Failed to write INT_EP_CTL: %d", ret);
946
947 ret = smsc75xx_read_reg(dev, MAC_TX, &buf);
948 check_warn_return(ret, "Failed to read MAC_TX: %d", ret);
949
950 buf |= MAC_TX_TXEN;
951
952 ret = smsc75xx_write_reg(dev, MAC_TX, buf);
953 check_warn_return(ret, "Failed to write MAC_TX: %d", ret);
954
955 netif_dbg(dev, ifup, dev->net, "MAC_TX set to 0x%08x", buf);
956
957 ret = smsc75xx_read_reg(dev, FCT_TX_CTL, &buf);
958 check_warn_return(ret, "Failed to read FCT_TX_CTL: %d", ret);
959
960 buf |= FCT_TX_CTL_EN;
961
962 ret = smsc75xx_write_reg(dev, FCT_TX_CTL, buf);
963 check_warn_return(ret, "Failed to write FCT_TX_CTL: %d", ret);
964
965 netif_dbg(dev, ifup, dev->net, "FCT_TX_CTL set to 0x%08x", buf);
966
967 ret = smsc75xx_set_rx_max_frame_length(dev, 1514);
968 check_warn_return(ret, "Failed to set max rx frame length");
969
970 ret = smsc75xx_read_reg(dev, MAC_RX, &buf);
971 check_warn_return(ret, "Failed to read MAC_RX: %d", ret);
972
973 buf |= MAC_RX_RXEN;
974
975 ret = smsc75xx_write_reg(dev, MAC_RX, buf);
976 check_warn_return(ret, "Failed to write MAC_RX: %d", ret);
977
978 netif_dbg(dev, ifup, dev->net, "MAC_RX set to 0x%08x", buf);
979
980 ret = smsc75xx_read_reg(dev, FCT_RX_CTL, &buf);
981 check_warn_return(ret, "Failed to read FCT_RX_CTL: %d", ret);
982
983 buf |= FCT_RX_CTL_EN;
984
985 ret = smsc75xx_write_reg(dev, FCT_RX_CTL, buf);
986 check_warn_return(ret, "Failed to write FCT_RX_CTL: %d", ret);
987
988 netif_dbg(dev, ifup, dev->net, "FCT_RX_CTL set to 0x%08x", buf);
989
990 netif_dbg(dev, ifup, dev->net, "smsc75xx_reset, return 0");
991 return 0;
992 }
993
994 static const struct net_device_ops smsc75xx_netdev_ops = {
995 .ndo_open = usbnet_open,
996 .ndo_stop = usbnet_stop,
997 .ndo_start_xmit = usbnet_start_xmit,
998 .ndo_tx_timeout = usbnet_tx_timeout,
999 .ndo_change_mtu = smsc75xx_change_mtu,
1000 .ndo_set_mac_address = eth_mac_addr,
1001 .ndo_validate_addr = eth_validate_addr,
1002 .ndo_do_ioctl = smsc75xx_ioctl,
1003 .ndo_set_multicast_list = smsc75xx_set_multicast,
1004 .ndo_set_features = smsc75xx_set_features,
1005 };
1006
1007 static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
1008 {
1009 struct smsc75xx_priv *pdata = NULL;
1010 int ret;
1011
1012 printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1013
1014 ret = usbnet_get_endpoints(dev, intf);
1015 check_warn_return(ret, "usbnet_get_endpoints failed: %d", ret);
1016
1017 dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc75xx_priv),
1018 GFP_KERNEL);
1019
1020 pdata = (struct smsc75xx_priv *)(dev->data[0]);
1021 if (!pdata) {
1022 netdev_warn(dev->net, "Unable to allocate smsc75xx_priv");
1023 return -ENOMEM;
1024 }
1025
1026 pdata->dev = dev;
1027
1028 spin_lock_init(&pdata->rfe_ctl_lock);
1029 mutex_init(&pdata->dataport_mutex);
1030
1031 INIT_WORK(&pdata->set_multicast, smsc75xx_deferred_multicast_write);
1032
1033 if (DEFAULT_TX_CSUM_ENABLE) {
1034 dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1035 if (DEFAULT_TSO_ENABLE)
1036 dev->net->features |= NETIF_F_SG |
1037 NETIF_F_TSO | NETIF_F_TSO6;
1038 }
1039 if (DEFAULT_RX_CSUM_ENABLE)
1040 dev->net->features |= NETIF_F_RXCSUM;
1041
1042 dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1043 NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_RXCSUM;
1044
1045 /* Init all registers */
1046 ret = smsc75xx_reset(dev);
1047
1048 dev->net->netdev_ops = &smsc75xx_netdev_ops;
1049 dev->net->ethtool_ops = &smsc75xx_ethtool_ops;
1050 dev->net->flags |= IFF_MULTICAST;
1051 dev->net->hard_header_len += SMSC75XX_TX_OVERHEAD;
1052 return 0;
1053 }
1054
1055 static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1056 {
1057 struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
1058 if (pdata) {
1059 netif_dbg(dev, ifdown, dev->net, "free pdata");
1060 kfree(pdata);
1061 pdata = NULL;
1062 dev->data[0] = 0;
1063 }
1064 }
1065
1066 static void smsc75xx_rx_csum_offload(struct usbnet *dev, struct sk_buff *skb,
1067 u32 rx_cmd_a, u32 rx_cmd_b)
1068 {
1069 if (!(dev->net->features & NETIF_F_RXCSUM) ||
1070 unlikely(rx_cmd_a & RX_CMD_A_LCSM)) {
1071 skb->ip_summed = CHECKSUM_NONE;
1072 } else {
1073 skb->csum = ntohs((u16)(rx_cmd_b >> RX_CMD_B_CSUM_SHIFT));
1074 skb->ip_summed = CHECKSUM_COMPLETE;
1075 }
1076 }
1077
1078 static int smsc75xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1079 {
1080 while (skb->len > 0) {
1081 u32 rx_cmd_a, rx_cmd_b, align_count, size;
1082 struct sk_buff *ax_skb;
1083 unsigned char *packet;
1084
1085 memcpy(&rx_cmd_a, skb->data, sizeof(rx_cmd_a));
1086 le32_to_cpus(&rx_cmd_a);
1087 skb_pull(skb, 4);
1088
1089 memcpy(&rx_cmd_b, skb->data, sizeof(rx_cmd_b));
1090 le32_to_cpus(&rx_cmd_b);
1091 skb_pull(skb, 4 + NET_IP_ALIGN);
1092
1093 packet = skb->data;
1094
1095 /* get the packet length */
1096 size = (rx_cmd_a & RX_CMD_A_LEN) - NET_IP_ALIGN;
1097 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1098
1099 if (unlikely(rx_cmd_a & RX_CMD_A_RED)) {
1100 netif_dbg(dev, rx_err, dev->net,
1101 "Error rx_cmd_a=0x%08x", rx_cmd_a);
1102 dev->net->stats.rx_errors++;
1103 dev->net->stats.rx_dropped++;
1104
1105 if (rx_cmd_a & RX_CMD_A_FCS)
1106 dev->net->stats.rx_crc_errors++;
1107 else if (rx_cmd_a & (RX_CMD_A_LONG | RX_CMD_A_RUNT))
1108 dev->net->stats.rx_frame_errors++;
1109 } else {
1110 /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1111 if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1112 netif_dbg(dev, rx_err, dev->net,
1113 "size err rx_cmd_a=0x%08x", rx_cmd_a);
1114 return 0;
1115 }
1116
1117 /* last frame in this batch */
1118 if (skb->len == size) {
1119 smsc75xx_rx_csum_offload(dev, skb, rx_cmd_a,
1120 rx_cmd_b);
1121
1122 skb_trim(skb, skb->len - 4); /* remove fcs */
1123 skb->truesize = size + sizeof(struct sk_buff);
1124
1125 return 1;
1126 }
1127
1128 ax_skb = skb_clone(skb, GFP_ATOMIC);
1129 if (unlikely(!ax_skb)) {
1130 netdev_warn(dev->net, "Error allocating skb");
1131 return 0;
1132 }
1133
1134 ax_skb->len = size;
1135 ax_skb->data = packet;
1136 skb_set_tail_pointer(ax_skb, size);
1137
1138 smsc75xx_rx_csum_offload(dev, ax_skb, rx_cmd_a,
1139 rx_cmd_b);
1140
1141 skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1142 ax_skb->truesize = size + sizeof(struct sk_buff);
1143
1144 usbnet_skb_return(dev, ax_skb);
1145 }
1146
1147 skb_pull(skb, size);
1148
1149 /* padding bytes before the next frame starts */
1150 if (skb->len)
1151 skb_pull(skb, align_count);
1152 }
1153
1154 if (unlikely(skb->len < 0)) {
1155 netdev_warn(dev->net, "invalid rx length<0 %d", skb->len);
1156 return 0;
1157 }
1158
1159 return 1;
1160 }
1161
1162 static struct sk_buff *smsc75xx_tx_fixup(struct usbnet *dev,
1163 struct sk_buff *skb, gfp_t flags)
1164 {
1165 u32 tx_cmd_a, tx_cmd_b;
1166
1167 skb_linearize(skb);
1168
1169 if (skb_headroom(skb) < SMSC75XX_TX_OVERHEAD) {
1170 struct sk_buff *skb2 =
1171 skb_copy_expand(skb, SMSC75XX_TX_OVERHEAD, 0, flags);
1172 dev_kfree_skb_any(skb);
1173 skb = skb2;
1174 if (!skb)
1175 return NULL;
1176 }
1177
1178 tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS;
1179
1180 if (skb->ip_summed == CHECKSUM_PARTIAL)
1181 tx_cmd_a |= TX_CMD_A_IPE | TX_CMD_A_TPE;
1182
1183 if (skb_is_gso(skb)) {
1184 u16 mss = max(skb_shinfo(skb)->gso_size, TX_MSS_MIN);
1185 tx_cmd_b = (mss << TX_CMD_B_MSS_SHIFT) & TX_CMD_B_MSS;
1186
1187 tx_cmd_a |= TX_CMD_A_LSO;
1188 } else {
1189 tx_cmd_b = 0;
1190 }
1191
1192 skb_push(skb, 4);
1193 cpu_to_le32s(&tx_cmd_b);
1194 memcpy(skb->data, &tx_cmd_b, 4);
1195
1196 skb_push(skb, 4);
1197 cpu_to_le32s(&tx_cmd_a);
1198 memcpy(skb->data, &tx_cmd_a, 4);
1199
1200 return skb;
1201 }
1202
1203 static const struct driver_info smsc75xx_info = {
1204 .description = "smsc75xx USB 2.0 Gigabit Ethernet",
1205 .bind = smsc75xx_bind,
1206 .unbind = smsc75xx_unbind,
1207 .link_reset = smsc75xx_link_reset,
1208 .reset = smsc75xx_reset,
1209 .rx_fixup = smsc75xx_rx_fixup,
1210 .tx_fixup = smsc75xx_tx_fixup,
1211 .status = smsc75xx_status,
1212 .flags = FLAG_ETHER | FLAG_SEND_ZLP,
1213 };
1214
1215 static const struct usb_device_id products[] = {
1216 {
1217 /* SMSC7500 USB Gigabit Ethernet Device */
1218 USB_DEVICE(USB_VENDOR_ID_SMSC, USB_PRODUCT_ID_LAN7500),
1219 .driver_info = (unsigned long) &smsc75xx_info,
1220 },
1221 {
1222 /* SMSC7500 USB Gigabit Ethernet Device */
1223 USB_DEVICE(USB_VENDOR_ID_SMSC, USB_PRODUCT_ID_LAN7505),
1224 .driver_info = (unsigned long) &smsc75xx_info,
1225 },
1226 { }, /* END */
1227 };
1228 MODULE_DEVICE_TABLE(usb, products);
1229
1230 static struct usb_driver smsc75xx_driver = {
1231 .name = SMSC_CHIPNAME,
1232 .id_table = products,
1233 .probe = usbnet_probe,
1234 .suspend = usbnet_suspend,
1235 .resume = usbnet_resume,
1236 .disconnect = usbnet_disconnect,
1237 };
1238
1239 static int __init smsc75xx_init(void)
1240 {
1241 return usb_register(&smsc75xx_driver);
1242 }
1243 module_init(smsc75xx_init);
1244
1245 static void __exit smsc75xx_exit(void)
1246 {
1247 usb_deregister(&smsc75xx_driver);
1248 }
1249 module_exit(smsc75xx_exit);
1250
1251 MODULE_AUTHOR("Nancy Lin");
1252 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
1253 MODULE_DESCRIPTION("SMSC75XX USB 2.0 Gigabit Ethernet Devices");
1254 MODULE_LICENSE("GPL");
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