Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/drivers/net/usb/smsc95xx.c

  1  /***************************************************************************
  2  *
  3  * Copyright (C) 2007-2008 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, see <http://www.gnu.org/licenses/>.
 17  *
 18  *****************************************************************************/
 19 
 20 #include <linux/module.h>
 21 #include <linux/kmod.h>
 22 #include <linux/netdevice.h>
 23 #include <linux/etherdevice.h>
 24 #include <linux/ethtool.h>
 25 #include <linux/mii.h>
 26 #include <linux/usb.h>
 27 #include <linux/bitrev.h>
 28 #include <linux/crc16.h>
 29 #include <linux/crc32.h>
 30 #include <linux/usb/usbnet.h>
 31 #include <linux/slab.h>
 32 #include "smsc95xx.h"
 33 
 34 #define SMSC_CHIPNAME                   "smsc95xx"
 35 #define SMSC_DRIVER_VERSION             "1.0.4"
 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          (2048)
 42 #define LAN95XX_EEPROM_MAGIC            (0x9500)
 43 #define EEPROM_MAC_OFFSET               (0x01)
 44 #define DEFAULT_TX_CSUM_ENABLE          (true)
 45 #define DEFAULT_RX_CSUM_ENABLE          (true)
 46 #define SMSC95XX_INTERNAL_PHY_ID        (1)
 47 #define SMSC95XX_TX_OVERHEAD            (8)
 48 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
 49 #define SUPPORTED_WAKE                  (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
 50                                          WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
 51 
 52 #define FEATURE_8_WAKEUP_FILTERS        (0x01)
 53 #define FEATURE_PHY_NLP_CROSSOVER       (0x02)
 54 #define FEATURE_REMOTE_WAKEUP           (0x04)
 55 
 56 #define SUSPEND_SUSPEND0                (0x01)
 57 #define SUSPEND_SUSPEND1                (0x02)
 58 #define SUSPEND_SUSPEND2                (0x04)
 59 #define SUSPEND_SUSPEND3                (0x08)
 60 #define SUSPEND_ALLMODES                (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
 61                                          SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
 62 
 63 struct smsc95xx_priv {
 64         u32 mac_cr;
 65         u32 hash_hi;
 66         u32 hash_lo;
 67         u32 wolopts;
 68         spinlock_t mac_cr_lock;
 69         u8 features;
 70         u8 suspend_flags;
 71 };
 72 
 73 static bool turbo_mode = true;
 74 module_param(turbo_mode, bool, 0644);
 75 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
 76 
 77 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
 78                                             u32 *data, int in_pm)
 79 {
 80         u32 buf;
 81         int ret;
 82         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
 83 
 84         BUG_ON(!dev);
 85 
 86         if (!in_pm)
 87                 fn = usbnet_read_cmd;
 88         else
 89                 fn = usbnet_read_cmd_nopm;
 90 
 91         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
 92                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 93                  0, index, &buf, 4);
 94         if (unlikely(ret < 0))
 95                 netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
 96                             index, ret);
 97 
 98         le32_to_cpus(&buf);
 99         *data = buf;
100 
101         return ret;
102 }
103 
104 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
105                                              u32 data, int in_pm)
106 {
107         u32 buf;
108         int ret;
109         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
110 
111         BUG_ON(!dev);
112 
113         if (!in_pm)
114                 fn = usbnet_write_cmd;
115         else
116                 fn = usbnet_write_cmd_nopm;
117 
118         buf = data;
119         cpu_to_le32s(&buf);
120 
121         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
122                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
123                  0, index, &buf, 4);
124         if (unlikely(ret < 0))
125                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
126                             index, ret);
127 
128         return ret;
129 }
130 
131 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
132                                                u32 *data)
133 {
134         return __smsc95xx_read_reg(dev, index, data, 1);
135 }
136 
137 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
138                                                 u32 data)
139 {
140         return __smsc95xx_write_reg(dev, index, data, 1);
141 }
142 
143 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
144                                           u32 *data)
145 {
146         return __smsc95xx_read_reg(dev, index, data, 0);
147 }
148 
149 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
150                                            u32 data)
151 {
152         return __smsc95xx_write_reg(dev, index, data, 0);
153 }
154 
155 /* Loop until the read is completed with timeout
156  * called with phy_mutex held */
157 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
158                                                      int in_pm)
159 {
160         unsigned long start_time = jiffies;
161         u32 val;
162         int ret;
163 
164         do {
165                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
166                 if (ret < 0) {
167                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
168                         return ret;
169                 }
170 
171                 if (!(val & MII_BUSY_))
172                         return 0;
173         } while (!time_after(jiffies, start_time + HZ));
174 
175         return -EIO;
176 }
177 
178 static int __smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx,
179                                 int in_pm)
180 {
181         struct usbnet *dev = netdev_priv(netdev);
182         u32 val, addr;
183         int ret;
184 
185         mutex_lock(&dev->phy_mutex);
186 
187         /* confirm MII not busy */
188         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
189         if (ret < 0) {
190                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_read\n");
191                 goto done;
192         }
193 
194         /* set the address, index & direction (read from PHY) */
195         phy_id &= dev->mii.phy_id_mask;
196         idx &= dev->mii.reg_num_mask;
197         addr = (phy_id << 11) | (idx << 6) | MII_READ_ | MII_BUSY_;
198         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
199         if (ret < 0) {
200                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
201                 goto done;
202         }
203 
204         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
205         if (ret < 0) {
206                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
207                 goto done;
208         }
209 
210         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
211         if (ret < 0) {
212                 netdev_warn(dev->net, "Error reading MII_DATA\n");
213                 goto done;
214         }
215 
216         ret = (u16)(val & 0xFFFF);
217 
218 done:
219         mutex_unlock(&dev->phy_mutex);
220         return ret;
221 }
222 
223 static void __smsc95xx_mdio_write(struct net_device *netdev, int phy_id,
224                                   int idx, int regval, int in_pm)
225 {
226         struct usbnet *dev = netdev_priv(netdev);
227         u32 val, addr;
228         int ret;
229 
230         mutex_lock(&dev->phy_mutex);
231 
232         /* confirm MII not busy */
233         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
234         if (ret < 0) {
235                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_write\n");
236                 goto done;
237         }
238 
239         val = regval;
240         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
241         if (ret < 0) {
242                 netdev_warn(dev->net, "Error writing MII_DATA\n");
243                 goto done;
244         }
245 
246         /* set the address, index & direction (write to PHY) */
247         phy_id &= dev->mii.phy_id_mask;
248         idx &= dev->mii.reg_num_mask;
249         addr = (phy_id << 11) | (idx << 6) | MII_WRITE_ | MII_BUSY_;
250         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
251         if (ret < 0) {
252                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
253                 goto done;
254         }
255 
256         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
257         if (ret < 0) {
258                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
259                 goto done;
260         }
261 
262 done:
263         mutex_unlock(&dev->phy_mutex);
264 }
265 
266 static int smsc95xx_mdio_read_nopm(struct net_device *netdev, int phy_id,
267                                    int idx)
268 {
269         return __smsc95xx_mdio_read(netdev, phy_id, idx, 1);
270 }
271 
272 static void smsc95xx_mdio_write_nopm(struct net_device *netdev, int phy_id,
273                                      int idx, int regval)
274 {
275         __smsc95xx_mdio_write(netdev, phy_id, idx, regval, 1);
276 }
277 
278 static int smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
279 {
280         return __smsc95xx_mdio_read(netdev, phy_id, idx, 0);
281 }
282 
283 static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
284                                 int regval)
285 {
286         __smsc95xx_mdio_write(netdev, phy_id, idx, regval, 0);
287 }
288 
289 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
290 {
291         unsigned long start_time = jiffies;
292         u32 val;
293         int ret;
294 
295         do {
296                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
297                 if (ret < 0) {
298                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
299                         return ret;
300                 }
301 
302                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
303                         break;
304                 udelay(40);
305         } while (!time_after(jiffies, start_time + HZ));
306 
307         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
308                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
309                 return -EIO;
310         }
311 
312         return 0;
313 }
314 
315 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
316 {
317         unsigned long start_time = jiffies;
318         u32 val;
319         int ret;
320 
321         do {
322                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
323                 if (ret < 0) {
324                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
325                         return ret;
326                 }
327 
328                 if (!(val & E2P_CMD_BUSY_))
329                         return 0;
330 
331                 udelay(40);
332         } while (!time_after(jiffies, start_time + HZ));
333 
334         netdev_warn(dev->net, "EEPROM is busy\n");
335         return -EIO;
336 }
337 
338 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
339                                 u8 *data)
340 {
341         u32 val;
342         int i, ret;
343 
344         BUG_ON(!dev);
345         BUG_ON(!data);
346 
347         ret = smsc95xx_eeprom_confirm_not_busy(dev);
348         if (ret)
349                 return ret;
350 
351         for (i = 0; i < length; i++) {
352                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
353                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
354                 if (ret < 0) {
355                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
356                         return ret;
357                 }
358 
359                 ret = smsc95xx_wait_eeprom(dev);
360                 if (ret < 0)
361                         return ret;
362 
363                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
364                 if (ret < 0) {
365                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
366                         return ret;
367                 }
368 
369                 data[i] = val & 0xFF;
370                 offset++;
371         }
372 
373         return 0;
374 }
375 
376 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
377                                  u8 *data)
378 {
379         u32 val;
380         int i, ret;
381 
382         BUG_ON(!dev);
383         BUG_ON(!data);
384 
385         ret = smsc95xx_eeprom_confirm_not_busy(dev);
386         if (ret)
387                 return ret;
388 
389         /* Issue write/erase enable command */
390         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
391         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
392         if (ret < 0) {
393                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
394                 return ret;
395         }
396 
397         ret = smsc95xx_wait_eeprom(dev);
398         if (ret < 0)
399                 return ret;
400 
401         for (i = 0; i < length; i++) {
402 
403                 /* Fill data register */
404                 val = data[i];
405                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
406                 if (ret < 0) {
407                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
408                         return ret;
409                 }
410 
411                 /* Send "write" command */
412                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
413                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
414                 if (ret < 0) {
415                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
416                         return ret;
417                 }
418 
419                 ret = smsc95xx_wait_eeprom(dev);
420                 if (ret < 0)
421                         return ret;
422 
423                 offset++;
424         }
425 
426         return 0;
427 }
428 
429 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
430                                                  u32 data)
431 {
432         const u16 size = 4;
433         u32 buf;
434         int ret;
435 
436         buf = data;
437         cpu_to_le32s(&buf);
438 
439         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
440                                      USB_DIR_OUT | USB_TYPE_VENDOR |
441                                      USB_RECIP_DEVICE,
442                                      0, index, &buf, size);
443         if (ret < 0)
444                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
445                             ret);
446         return ret;
447 }
448 
449 /* returns hash bit number for given MAC address
450  * example:
451  * 01 00 5E 00 00 01 -> returns bit number 31 */
452 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
453 {
454         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
455 }
456 
457 static void smsc95xx_set_multicast(struct net_device *netdev)
458 {
459         struct usbnet *dev = netdev_priv(netdev);
460         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
461         unsigned long flags;
462         int ret;
463 
464         pdata->hash_hi = 0;
465         pdata->hash_lo = 0;
466 
467         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
468 
469         if (dev->net->flags & IFF_PROMISC) {
470                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
471                 pdata->mac_cr |= MAC_CR_PRMS_;
472                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
473         } else if (dev->net->flags & IFF_ALLMULTI) {
474                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
475                 pdata->mac_cr |= MAC_CR_MCPAS_;
476                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
477         } else if (!netdev_mc_empty(dev->net)) {
478                 struct netdev_hw_addr *ha;
479 
480                 pdata->mac_cr |= MAC_CR_HPFILT_;
481                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
482 
483                 netdev_for_each_mc_addr(ha, netdev) {
484                         u32 bitnum = smsc95xx_hash(ha->addr);
485                         u32 mask = 0x01 << (bitnum & 0x1F);
486                         if (bitnum & 0x20)
487                                 pdata->hash_hi |= mask;
488                         else
489                                 pdata->hash_lo |= mask;
490                 }
491 
492                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
493                                    pdata->hash_hi, pdata->hash_lo);
494         } else {
495                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
496                 pdata->mac_cr &=
497                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
498         }
499 
500         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
501 
502         /* Initiate async writes, as we can't wait for completion here */
503         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
504         if (ret < 0)
505                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
506 
507         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
508         if (ret < 0)
509                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
510 
511         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
512         if (ret < 0)
513                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
514 }
515 
516 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
517                                            u16 lcladv, u16 rmtadv)
518 {
519         u32 flow, afc_cfg = 0;
520 
521         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
522         if (ret < 0)
523                 return ret;
524 
525         if (duplex == DUPLEX_FULL) {
526                 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
527 
528                 if (cap & FLOW_CTRL_RX)
529                         flow = 0xFFFF0002;
530                 else
531                         flow = 0;
532 
533                 if (cap & FLOW_CTRL_TX)
534                         afc_cfg |= 0xF;
535                 else
536                         afc_cfg &= ~0xF;
537 
538                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
539                                    cap & FLOW_CTRL_RX ? "enabled" : "disabled",
540                                    cap & FLOW_CTRL_TX ? "enabled" : "disabled");
541         } else {
542                 netif_dbg(dev, link, dev->net, "half duplex\n");
543                 flow = 0;
544                 afc_cfg |= 0xF;
545         }
546 
547         ret = smsc95xx_write_reg(dev, FLOW, flow);
548         if (ret < 0)
549                 return ret;
550 
551         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
552 }
553 
554 static int smsc95xx_link_reset(struct usbnet *dev)
555 {
556         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
557         struct mii_if_info *mii = &dev->mii;
558         struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
559         unsigned long flags;
560         u16 lcladv, rmtadv;
561         int ret;
562 
563         /* clear interrupt status */
564         ret = smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
565         if (ret < 0)
566                 return ret;
567 
568         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
569         if (ret < 0)
570                 return ret;
571 
572         mii_check_media(mii, 1, 1);
573         mii_ethtool_gset(&dev->mii, &ecmd);
574         lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
575         rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
576 
577         netif_dbg(dev, link, dev->net,
578                   "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
579                   ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
580 
581         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
582         if (ecmd.duplex != DUPLEX_FULL) {
583                 pdata->mac_cr &= ~MAC_CR_FDPX_;
584                 pdata->mac_cr |= MAC_CR_RCVOWN_;
585         } else {
586                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
587                 pdata->mac_cr |= MAC_CR_FDPX_;
588         }
589         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
590 
591         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
592         if (ret < 0)
593                 return ret;
594 
595         ret = smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
596         if (ret < 0)
597                 netdev_warn(dev->net, "Error updating PHY flow control\n");
598 
599         return ret;
600 }
601 
602 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
603 {
604         u32 intdata;
605 
606         if (urb->actual_length != 4) {
607                 netdev_warn(dev->net, "unexpected urb length %d\n",
608                             urb->actual_length);
609                 return;
610         }
611 
612         memcpy(&intdata, urb->transfer_buffer, 4);
613         le32_to_cpus(&intdata);
614 
615         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
616 
617         if (intdata & INT_ENP_PHY_INT_)
618                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
619         else
620                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
621                             intdata);
622 }
623 
624 /* Enable or disable Tx & Rx checksum offload engines */
625 static int smsc95xx_set_features(struct net_device *netdev,
626         netdev_features_t features)
627 {
628         struct usbnet *dev = netdev_priv(netdev);
629         u32 read_buf;
630         int ret;
631 
632         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
633         if (ret < 0)
634                 return ret;
635 
636         if (features & NETIF_F_HW_CSUM)
637                 read_buf |= Tx_COE_EN_;
638         else
639                 read_buf &= ~Tx_COE_EN_;
640 
641         if (features & NETIF_F_RXCSUM)
642                 read_buf |= Rx_COE_EN_;
643         else
644                 read_buf &= ~Rx_COE_EN_;
645 
646         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
647         if (ret < 0)
648                 return ret;
649 
650         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
651         return 0;
652 }
653 
654 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
655 {
656         return MAX_EEPROM_SIZE;
657 }
658 
659 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
660                                        struct ethtool_eeprom *ee, u8 *data)
661 {
662         struct usbnet *dev = netdev_priv(netdev);
663 
664         ee->magic = LAN95XX_EEPROM_MAGIC;
665 
666         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
667 }
668 
669 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
670                                        struct ethtool_eeprom *ee, u8 *data)
671 {
672         struct usbnet *dev = netdev_priv(netdev);
673 
674         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
675                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
676                             ee->magic);
677                 return -EINVAL;
678         }
679 
680         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
681 }
682 
683 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
684 {
685         /* all smsc95xx registers */
686         return COE_CR - ID_REV + sizeof(u32);
687 }
688 
689 static void
690 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
691                          void *buf)
692 {
693         struct usbnet *dev = netdev_priv(netdev);
694         unsigned int i, j;
695         int retval;
696         u32 *data = buf;
697 
698         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
699         if (retval < 0) {
700                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
701                 return;
702         }
703 
704         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
705                 retval = smsc95xx_read_reg(dev, i, &data[j]);
706                 if (retval < 0) {
707                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
708                         return;
709                 }
710         }
711 }
712 
713 static void smsc95xx_ethtool_get_wol(struct net_device *net,
714                                      struct ethtool_wolinfo *wolinfo)
715 {
716         struct usbnet *dev = netdev_priv(net);
717         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
718 
719         wolinfo->supported = SUPPORTED_WAKE;
720         wolinfo->wolopts = pdata->wolopts;
721 }
722 
723 static int smsc95xx_ethtool_set_wol(struct net_device *net,
724                                     struct ethtool_wolinfo *wolinfo)
725 {
726         struct usbnet *dev = netdev_priv(net);
727         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
728         int ret;
729 
730         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
731 
732         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
733         if (ret < 0)
734                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
735 
736         return ret;
737 }
738 
739 static const struct ethtool_ops smsc95xx_ethtool_ops = {
740         .get_link       = usbnet_get_link,
741         .nway_reset     = usbnet_nway_reset,
742         .get_drvinfo    = usbnet_get_drvinfo,
743         .get_msglevel   = usbnet_get_msglevel,
744         .set_msglevel   = usbnet_set_msglevel,
745         .get_settings   = usbnet_get_settings,
746         .set_settings   = usbnet_set_settings,
747         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
748         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
749         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
750         .get_regs_len   = smsc95xx_ethtool_getregslen,
751         .get_regs       = smsc95xx_ethtool_getregs,
752         .get_wol        = smsc95xx_ethtool_get_wol,
753         .set_wol        = smsc95xx_ethtool_set_wol,
754 };
755 
756 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
757 {
758         struct usbnet *dev = netdev_priv(netdev);
759 
760         if (!netif_running(netdev))
761                 return -EINVAL;
762 
763         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
764 }
765 
766 static void smsc95xx_init_mac_address(struct usbnet *dev)
767 {
768         /* try reading mac address from EEPROM */
769         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
770                         dev->net->dev_addr) == 0) {
771                 if (is_valid_ether_addr(dev->net->dev_addr)) {
772                         /* eeprom values are valid so use them */
773                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
774                         return;
775                 }
776         }
777 
778         /* no eeprom, or eeprom values are invalid. generate random MAC */
779         eth_hw_addr_random(dev->net);
780         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
781 }
782 
783 static int smsc95xx_set_mac_address(struct usbnet *dev)
784 {
785         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
786                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
787         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
788         int ret;
789 
790         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
791         if (ret < 0)
792                 return ret;
793 
794         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
795 }
796 
797 /* starts the TX path */
798 static int smsc95xx_start_tx_path(struct usbnet *dev)
799 {
800         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
801         unsigned long flags;
802         int ret;
803 
804         /* Enable Tx at MAC */
805         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
806         pdata->mac_cr |= MAC_CR_TXEN_;
807         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
808 
809         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
810         if (ret < 0)
811                 return ret;
812 
813         /* Enable Tx at SCSRs */
814         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
815 }
816 
817 /* Starts the Receive path */
818 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
819 {
820         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
821         unsigned long flags;
822 
823         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
824         pdata->mac_cr |= MAC_CR_RXEN_;
825         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
826 
827         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
828 }
829 
830 static int smsc95xx_phy_initialize(struct usbnet *dev)
831 {
832         int bmcr, ret, timeout = 0;
833 
834         /* Initialize MII structure */
835         dev->mii.dev = dev->net;
836         dev->mii.mdio_read = smsc95xx_mdio_read;
837         dev->mii.mdio_write = smsc95xx_mdio_write;
838         dev->mii.phy_id_mask = 0x1f;
839         dev->mii.reg_num_mask = 0x1f;
840         dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
841 
842         /* reset phy and wait for reset to complete */
843         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
844 
845         do {
846                 msleep(10);
847                 bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
848                 timeout++;
849         } while ((bmcr & BMCR_RESET) && (timeout < 100));
850 
851         if (timeout >= 100) {
852                 netdev_warn(dev->net, "timeout on PHY Reset");
853                 return -EIO;
854         }
855 
856         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
857                 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
858                 ADVERTISE_PAUSE_ASYM);
859 
860         /* read to clear */
861         ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
862         if (ret < 0) {
863                 netdev_warn(dev->net, "Failed to read PHY_INT_SRC during init\n");
864                 return ret;
865         }
866 
867         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
868                 PHY_INT_MASK_DEFAULT_);
869         mii_nway_restart(&dev->mii);
870 
871         netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
872         return 0;
873 }
874 
875 static int smsc95xx_reset(struct usbnet *dev)
876 {
877         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
878         u32 read_buf, write_buf, burst_cap;
879         int ret = 0, timeout;
880 
881         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
882 
883         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
884         if (ret < 0)
885                 return ret;
886 
887         timeout = 0;
888         do {
889                 msleep(10);
890                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
891                 if (ret < 0)
892                         return ret;
893                 timeout++;
894         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
895 
896         if (timeout >= 100) {
897                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
898                 return ret;
899         }
900 
901         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
902         if (ret < 0)
903                 return ret;
904 
905         timeout = 0;
906         do {
907                 msleep(10);
908                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
909                 if (ret < 0)
910                         return ret;
911                 timeout++;
912         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
913 
914         if (timeout >= 100) {
915                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
916                 return ret;
917         }
918 
919         ret = smsc95xx_set_mac_address(dev);
920         if (ret < 0)
921                 return ret;
922 
923         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
924                   dev->net->dev_addr);
925 
926         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
927         if (ret < 0)
928                 return ret;
929 
930         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
931                   read_buf);
932 
933         read_buf |= HW_CFG_BIR_;
934 
935         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
936         if (ret < 0)
937                 return ret;
938 
939         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
940         if (ret < 0)
941                 return ret;
942 
943         netif_dbg(dev, ifup, dev->net,
944                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
945                   read_buf);
946 
947         if (!turbo_mode) {
948                 burst_cap = 0;
949                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
950         } else if (dev->udev->speed == USB_SPEED_HIGH) {
951                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
952                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
953         } else {
954                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
955                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
956         }
957 
958         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
959                   (ulong)dev->rx_urb_size);
960 
961         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
962         if (ret < 0)
963                 return ret;
964 
965         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
966         if (ret < 0)
967                 return ret;
968 
969         netif_dbg(dev, ifup, dev->net,
970                   "Read Value from BURST_CAP after writing: 0x%08x\n",
971                   read_buf);
972 
973         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
974         if (ret < 0)
975                 return ret;
976 
977         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
978         if (ret < 0)
979                 return ret;
980 
981         netif_dbg(dev, ifup, dev->net,
982                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
983                   read_buf);
984 
985         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
986         if (ret < 0)
987                 return ret;
988 
989         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
990                   read_buf);
991 
992         if (turbo_mode)
993                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
994 
995         read_buf &= ~HW_CFG_RXDOFF_;
996 
997         /* set Rx data offset=2, Make IP header aligns on word boundary. */
998         read_buf |= NET_IP_ALIGN << 9;
999 
1000         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
1001         if (ret < 0)
1002                 return ret;
1003 
1004         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1005         if (ret < 0)
1006                 return ret;
1007 
1008         netif_dbg(dev, ifup, dev->net,
1009                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
1010 
1011         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
1012         if (ret < 0)
1013                 return ret;
1014 
1015         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1016         if (ret < 0)
1017                 return ret;
1018         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1019 
1020         /* Configure GPIO pins as LED outputs */
1021         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1022                 LED_GPIO_CFG_FDX_LED;
1023         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1024         if (ret < 0)
1025                 return ret;
1026 
1027         /* Init Tx */
1028         ret = smsc95xx_write_reg(dev, FLOW, 0);
1029         if (ret < 0)
1030                 return ret;
1031 
1032         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1033         if (ret < 0)
1034                 return ret;
1035 
1036         /* Don't need mac_cr_lock during initialisation */
1037         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1038         if (ret < 0)
1039                 return ret;
1040 
1041         /* Init Rx */
1042         /* Set Vlan */
1043         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1044         if (ret < 0)
1045                 return ret;
1046 
1047         /* Enable or disable checksum offload engines */
1048         ret = smsc95xx_set_features(dev->net, dev->net->features);
1049         if (ret < 0) {
1050                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1051                 return ret;
1052         }
1053 
1054         smsc95xx_set_multicast(dev->net);
1055 
1056         ret = smsc95xx_phy_initialize(dev);
1057         if (ret < 0) {
1058                 netdev_warn(dev->net, "Failed to init PHY\n");
1059                 return ret;
1060         }
1061 
1062         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1063         if (ret < 0)
1064                 return ret;
1065 
1066         /* enable PHY interrupts */
1067         read_buf |= INT_EP_CTL_PHY_INT_;
1068 
1069         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1070         if (ret < 0)
1071                 return ret;
1072 
1073         ret = smsc95xx_start_tx_path(dev);
1074         if (ret < 0) {
1075                 netdev_warn(dev->net, "Failed to start TX path\n");
1076                 return ret;
1077         }
1078 
1079         ret = smsc95xx_start_rx_path(dev, 0);
1080         if (ret < 0) {
1081                 netdev_warn(dev->net, "Failed to start RX path\n");
1082                 return ret;
1083         }
1084 
1085         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1086         return 0;
1087 }
1088 
1089 static const struct net_device_ops smsc95xx_netdev_ops = {
1090         .ndo_open               = usbnet_open,
1091         .ndo_stop               = usbnet_stop,
1092         .ndo_start_xmit         = usbnet_start_xmit,
1093         .ndo_tx_timeout         = usbnet_tx_timeout,
1094         .ndo_change_mtu         = usbnet_change_mtu,
1095         .ndo_set_mac_address    = eth_mac_addr,
1096         .ndo_validate_addr      = eth_validate_addr,
1097         .ndo_do_ioctl           = smsc95xx_ioctl,
1098         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1099         .ndo_set_features       = smsc95xx_set_features,
1100 };
1101 
1102 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1103 {
1104         struct smsc95xx_priv *pdata = NULL;
1105         u32 val;
1106         int ret;
1107 
1108         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1109 
1110         ret = usbnet_get_endpoints(dev, intf);
1111         if (ret < 0) {
1112                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1113                 return ret;
1114         }
1115 
1116         dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
1117                                               GFP_KERNEL);
1118 
1119         pdata = (struct smsc95xx_priv *)(dev->data[0]);
1120         if (!pdata)
1121                 return -ENOMEM;
1122 
1123         spin_lock_init(&pdata->mac_cr_lock);
1124 
1125         if (DEFAULT_TX_CSUM_ENABLE)
1126                 dev->net->features |= NETIF_F_HW_CSUM;
1127         if (DEFAULT_RX_CSUM_ENABLE)
1128                 dev->net->features |= NETIF_F_RXCSUM;
1129 
1130         dev->net->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1131 
1132         smsc95xx_init_mac_address(dev);
1133 
1134         /* Init all registers */
1135         ret = smsc95xx_reset(dev);
1136 
1137         /* detect device revision as different features may be available */
1138         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1139         if (ret < 0)
1140                 return ret;
1141         val >>= 16;
1142 
1143         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1144             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1145                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1146                         FEATURE_PHY_NLP_CROSSOVER |
1147                         FEATURE_REMOTE_WAKEUP);
1148         else if (val == ID_REV_CHIP_ID_9512_)
1149                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1150 
1151         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1152         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1153         dev->net->flags |= IFF_MULTICAST;
1154         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1155         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1156         return 0;
1157 }
1158 
1159 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1160 {
1161         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1162         if (pdata) {
1163                 netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1164                 kfree(pdata);
1165                 pdata = NULL;
1166                 dev->data[0] = 0;
1167         }
1168 }
1169 
1170 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1171 {
1172         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1173         return crc << ((filter % 2) * 16);
1174 }
1175 
1176 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1177 {
1178         struct mii_if_info *mii = &dev->mii;
1179         int ret;
1180 
1181         netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1182 
1183         /* read to clear */
1184         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_SRC);
1185         if (ret < 0)
1186                 return ret;
1187 
1188         /* enable interrupt source */
1189         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_MASK);
1190         if (ret < 0)
1191                 return ret;
1192 
1193         ret |= mask;
1194 
1195         smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_INT_MASK, ret);
1196 
1197         return 0;
1198 }
1199 
1200 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1201 {
1202         struct mii_if_info *mii = &dev->mii;
1203         int ret;
1204 
1205         /* first, a dummy read, needed to latch some MII phys */
1206         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1207         if (ret < 0)
1208                 return ret;
1209 
1210         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1211         if (ret < 0)
1212                 return ret;
1213 
1214         return !!(ret & BMSR_LSTATUS);
1215 }
1216 
1217 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1218 {
1219         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1220         u32 val;
1221         int ret;
1222 
1223         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1224         if (ret < 0)
1225                 return ret;
1226 
1227         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1228         val |= PM_CTL_SUS_MODE_0;
1229 
1230         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1231         if (ret < 0)
1232                 return ret;
1233 
1234         /* clear wol status */
1235         val &= ~PM_CTL_WUPS_;
1236         val |= PM_CTL_WUPS_WOL_;
1237 
1238         /* enable energy detection */
1239         if (pdata->wolopts & WAKE_PHY)
1240                 val |= PM_CTL_WUPS_ED_;
1241 
1242         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1243         if (ret < 0)
1244                 return ret;
1245 
1246         /* read back PM_CTRL */
1247         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1248         if (ret < 0)
1249                 return ret;
1250 
1251         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1252 
1253         return 0;
1254 }
1255 
1256 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1257 {
1258         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1259         struct mii_if_info *mii = &dev->mii;
1260         u32 val;
1261         int ret;
1262 
1263         /* reconfigure link pulse detection timing for
1264          * compatibility with non-standard link partners
1265          */
1266         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1267                 smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_EDPD_CONFIG,
1268                         PHY_EDPD_CONFIG_DEFAULT);
1269 
1270         /* enable energy detect power-down mode */
1271         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS);
1272         if (ret < 0)
1273                 return ret;
1274 
1275         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1276 
1277         smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS, ret);
1278 
1279         /* enter SUSPEND1 mode */
1280         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1281         if (ret < 0)
1282                 return ret;
1283 
1284         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1285         val |= PM_CTL_SUS_MODE_1;
1286 
1287         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1288         if (ret < 0)
1289                 return ret;
1290 
1291         /* clear wol status, enable energy detection */
1292         val &= ~PM_CTL_WUPS_;
1293         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1294 
1295         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1296         if (ret < 0)
1297                 return ret;
1298 
1299         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1300 
1301         return 0;
1302 }
1303 
1304 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1305 {
1306         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1307         u32 val;
1308         int ret;
1309 
1310         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1311         if (ret < 0)
1312                 return ret;
1313 
1314         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1315         val |= PM_CTL_SUS_MODE_2;
1316 
1317         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1318         if (ret < 0)
1319                 return ret;
1320 
1321         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1322 
1323         return 0;
1324 }
1325 
1326 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1327 {
1328         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1329         u32 val;
1330         int ret;
1331 
1332         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1333         if (ret < 0)
1334                 return ret;
1335 
1336         if (val & 0xFFFF) {
1337                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1338                 return -EBUSY;
1339         }
1340 
1341         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1342         if (ret < 0)
1343                 return ret;
1344 
1345         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1346         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1347 
1348         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1349         if (ret < 0)
1350                 return ret;
1351 
1352         /* clear wol status */
1353         val &= ~PM_CTL_WUPS_;
1354         val |= PM_CTL_WUPS_WOL_;
1355 
1356         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1357         if (ret < 0)
1358                 return ret;
1359 
1360         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1361 
1362         return 0;
1363 }
1364 
1365 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1366 {
1367         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1368         int ret;
1369 
1370         if (!netif_running(dev->net)) {
1371                 /* interface is ifconfig down so fully power down hw */
1372                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1373                 return smsc95xx_enter_suspend2(dev);
1374         }
1375 
1376         if (!link_up) {
1377                 /* link is down so enter EDPD mode, but only if device can
1378                  * reliably resume from it.  This check should be redundant
1379                  * as current FEATURE_REMOTE_WAKEUP parts also support
1380                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1381                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1382                         netdev_warn(dev->net, "EDPD not supported\n");
1383                         return -EBUSY;
1384                 }
1385 
1386                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1387 
1388                 /* enable PHY wakeup events for if cable is attached */
1389                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1390                         PHY_INT_MASK_ANEG_COMP_);
1391                 if (ret < 0) {
1392                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1393                         return ret;
1394                 }
1395 
1396                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1397                 return smsc95xx_enter_suspend1(dev);
1398         }
1399 
1400         /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1401         ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1402                 PHY_INT_MASK_LINK_DOWN_);
1403         if (ret < 0) {
1404                 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1405                 return ret;
1406         }
1407 
1408         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1409         return smsc95xx_enter_suspend3(dev);
1410 }
1411 
1412 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1413 {
1414         struct usbnet *dev = usb_get_intfdata(intf);
1415         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1416         u32 val, link_up;
1417         int ret;
1418 
1419         ret = usbnet_suspend(intf, message);
1420         if (ret < 0) {
1421                 netdev_warn(dev->net, "usbnet_suspend error\n");
1422                 return ret;
1423         }
1424 
1425         if (pdata->suspend_flags) {
1426                 netdev_warn(dev->net, "error during last resume\n");
1427                 pdata->suspend_flags = 0;
1428         }
1429 
1430         /* determine if link is up using only _nopm functions */
1431         link_up = smsc95xx_link_ok_nopm(dev);
1432 
1433         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1434             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1435                 ret = smsc95xx_autosuspend(dev, link_up);
1436                 goto done;
1437         }
1438 
1439         /* if we get this far we're not autosuspending */
1440         /* if no wol options set, or if link is down and we're not waking on
1441          * PHY activity, enter lowest power SUSPEND2 mode
1442          */
1443         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1444                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1445                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1446 
1447                 /* disable energy detect (link up) & wake up events */
1448                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1449                 if (ret < 0)
1450                         goto done;
1451 
1452                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1453 
1454                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1455                 if (ret < 0)
1456                         goto done;
1457 
1458                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1459                 if (ret < 0)
1460                         goto done;
1461 
1462                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1463 
1464                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1465                 if (ret < 0)
1466                         goto done;
1467 
1468                 ret = smsc95xx_enter_suspend2(dev);
1469                 goto done;
1470         }
1471 
1472         if (pdata->wolopts & WAKE_PHY) {
1473                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1474                         (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1475                 if (ret < 0) {
1476                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1477                         goto done;
1478                 }
1479 
1480                 /* if link is down then configure EDPD and enter SUSPEND1,
1481                  * otherwise enter SUSPEND0 below
1482                  */
1483                 if (!link_up) {
1484                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1485                         ret = smsc95xx_enter_suspend1(dev);
1486                         goto done;
1487                 }
1488         }
1489 
1490         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1491                 u32 *filter_mask = kzalloc(sizeof(u32) * 32, GFP_KERNEL);
1492                 u32 command[2];
1493                 u32 offset[2];
1494                 u32 crc[4];
1495                 int wuff_filter_count =
1496                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1497                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1498                 int i, filter = 0;
1499 
1500                 if (!filter_mask) {
1501                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1502                         ret = -ENOMEM;
1503                         goto done;
1504                 }
1505 
1506                 memset(command, 0, sizeof(command));
1507                 memset(offset, 0, sizeof(offset));
1508                 memset(crc, 0, sizeof(crc));
1509 
1510                 if (pdata->wolopts & WAKE_BCAST) {
1511                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1512                         netdev_info(dev->net, "enabling broadcast detection\n");
1513                         filter_mask[filter * 4] = 0x003F;
1514                         filter_mask[filter * 4 + 1] = 0x00;
1515                         filter_mask[filter * 4 + 2] = 0x00;
1516                         filter_mask[filter * 4 + 3] = 0x00;
1517                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1518                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1519                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1520                         filter++;
1521                 }
1522 
1523                 if (pdata->wolopts & WAKE_MCAST) {
1524                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1525                         netdev_info(dev->net, "enabling multicast detection\n");
1526                         filter_mask[filter * 4] = 0x0007;
1527                         filter_mask[filter * 4 + 1] = 0x00;
1528                         filter_mask[filter * 4 + 2] = 0x00;
1529                         filter_mask[filter * 4 + 3] = 0x00;
1530                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1531                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1532                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1533                         filter++;
1534                 }
1535 
1536                 if (pdata->wolopts & WAKE_ARP) {
1537                         const u8 arp[] = {0x08, 0x06};
1538                         netdev_info(dev->net, "enabling ARP detection\n");
1539                         filter_mask[filter * 4] = 0x0003;
1540                         filter_mask[filter * 4 + 1] = 0x00;
1541                         filter_mask[filter * 4 + 2] = 0x00;
1542                         filter_mask[filter * 4 + 3] = 0x00;
1543                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1544                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1545                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1546                         filter++;
1547                 }
1548 
1549                 if (pdata->wolopts & WAKE_UCAST) {
1550                         netdev_info(dev->net, "enabling unicast detection\n");
1551                         filter_mask[filter * 4] = 0x003F;
1552                         filter_mask[filter * 4 + 1] = 0x00;
1553                         filter_mask[filter * 4 + 2] = 0x00;
1554                         filter_mask[filter * 4 + 3] = 0x00;
1555                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1556                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1557                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1558                         filter++;
1559                 }
1560 
1561                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1562                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1563                         if (ret < 0) {
1564                                 kfree(filter_mask);
1565                                 goto done;
1566                         }
1567                 }
1568                 kfree(filter_mask);
1569 
1570                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1571                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1572                         if (ret < 0)
1573                                 goto done;
1574                 }
1575 
1576                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1577                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1578                         if (ret < 0)
1579                                 goto done;
1580                 }
1581 
1582                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1583                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1584                         if (ret < 0)
1585                                 goto done;
1586                 }
1587 
1588                 /* clear any pending pattern match packet status */
1589                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1590                 if (ret < 0)
1591                         goto done;
1592 
1593                 val |= WUCSR_WUFR_;
1594 
1595                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1596                 if (ret < 0)
1597                         goto done;
1598         }
1599 
1600         if (pdata->wolopts & WAKE_MAGIC) {
1601                 /* clear any pending magic packet status */
1602                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1603                 if (ret < 0)
1604                         goto done;
1605 
1606                 val |= WUCSR_MPR_;
1607 
1608                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1609                 if (ret < 0)
1610                         goto done;
1611         }
1612 
1613         /* enable/disable wakeup sources */
1614         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1615         if (ret < 0)
1616                 goto done;
1617 
1618         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1619                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1620                 val |= WUCSR_WAKE_EN_;
1621         } else {
1622                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1623                 val &= ~WUCSR_WAKE_EN_;
1624         }
1625 
1626         if (pdata->wolopts & WAKE_MAGIC) {
1627                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1628                 val |= WUCSR_MPEN_;
1629         } else {
1630                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1631                 val &= ~WUCSR_MPEN_;
1632         }
1633 
1634         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1635         if (ret < 0)
1636                 goto done;
1637 
1638         /* enable wol wakeup source */
1639         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1640         if (ret < 0)
1641                 goto done;
1642 
1643         val |= PM_CTL_WOL_EN_;
1644 
1645         /* phy energy detect wakeup source */
1646         if (pdata->wolopts & WAKE_PHY)
1647                 val |= PM_CTL_ED_EN_;
1648 
1649         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1650         if (ret < 0)
1651                 goto done;
1652 
1653         /* enable receiver to enable frame reception */
1654         smsc95xx_start_rx_path(dev, 1);
1655 
1656         /* some wol options are enabled, so enter SUSPEND0 */
1657         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1658         ret = smsc95xx_enter_suspend0(dev);
1659 
1660 done:
1661         /*
1662          * TODO: resume() might need to handle the suspend failure
1663          * in system sleep
1664          */
1665         if (ret && PMSG_IS_AUTO(message))
1666                 usbnet_resume(intf);
1667         return ret;
1668 }
1669 
1670 static int smsc95xx_resume(struct usb_interface *intf)
1671 {
1672         struct usbnet *dev = usb_get_intfdata(intf);
1673         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1674         u8 suspend_flags = pdata->suspend_flags;
1675         int ret;
1676         u32 val;
1677 
1678         BUG_ON(!dev);
1679 
1680         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1681 
1682         /* do this first to ensure it's cleared even in error case */
1683         pdata->suspend_flags = 0;
1684 
1685         if (suspend_flags & SUSPEND_ALLMODES) {
1686                 /* clear wake-up sources */
1687                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1688                 if (ret < 0)
1689                         return ret;
1690 
1691                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1692 
1693                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1694                 if (ret < 0)
1695                         return ret;
1696 
1697                 /* clear wake-up status */
1698                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1699                 if (ret < 0)
1700                         return ret;
1701 
1702                 val &= ~PM_CTL_WOL_EN_;
1703                 val |= PM_CTL_WUPS_;
1704 
1705                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1706                 if (ret < 0)
1707                         return ret;
1708         }
1709 
1710         ret = usbnet_resume(intf);
1711         if (ret < 0)
1712                 netdev_warn(dev->net, "usbnet_resume error\n");
1713 
1714         return ret;
1715 }
1716 
1717 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1718 {
1719         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1720         skb->ip_summed = CHECKSUM_COMPLETE;
1721         skb_trim(skb, skb->len - 2);
1722 }
1723 
1724 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1725 {
1726         /* This check is no longer done by usbnet */
1727         if (skb->len < dev->net->hard_header_len)
1728                 return 0;
1729 
1730         while (skb->len > 0) {
1731                 u32 header, align_count;
1732                 struct sk_buff *ax_skb;
1733                 unsigned char *packet;
1734                 u16 size;
1735 
1736                 memcpy(&header, skb->data, sizeof(header));
1737                 le32_to_cpus(&header);
1738                 skb_pull(skb, 4 + NET_IP_ALIGN);
1739                 packet = skb->data;
1740 
1741                 /* get the packet length */
1742                 size = (u16)((header & RX_STS_FL_) >> 16);
1743                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1744 
1745                 if (unlikely(header & RX_STS_ES_)) {
1746                         netif_dbg(dev, rx_err, dev->net,
1747                                   "Error header=0x%08x\n", header);
1748                         dev->net->stats.rx_errors++;
1749                         dev->net->stats.rx_dropped++;
1750 
1751                         if (header & RX_STS_CRC_) {
1752                                 dev->net->stats.rx_crc_errors++;
1753                         } else {
1754                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1755                                         dev->net->stats.rx_frame_errors++;
1756 
1757                                 if ((header & RX_STS_LE_) &&
1758                                         (!(header & RX_STS_FT_)))
1759                                         dev->net->stats.rx_length_errors++;
1760                         }
1761                 } else {
1762                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1763                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1764                                 netif_dbg(dev, rx_err, dev->net,
1765                                           "size err header=0x%08x\n", header);
1766                                 return 0;
1767                         }
1768 
1769                         /* last frame in this batch */
1770                         if (skb->len == size) {
1771                                 if (dev->net->features & NETIF_F_RXCSUM)
1772                                         smsc95xx_rx_csum_offload(skb);
1773                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1774                                 skb->truesize = size + sizeof(struct sk_buff);
1775 
1776                                 return 1;
1777                         }
1778 
1779                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1780                         if (unlikely(!ax_skb)) {
1781                                 netdev_warn(dev->net, "Error allocating skb\n");
1782                                 return 0;
1783                         }
1784 
1785                         ax_skb->len = size;
1786                         ax_skb->data = packet;
1787                         skb_set_tail_pointer(ax_skb, size);
1788 
1789                         if (dev->net->features & NETIF_F_RXCSUM)
1790                                 smsc95xx_rx_csum_offload(ax_skb);
1791                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1792                         ax_skb->truesize = size + sizeof(struct sk_buff);
1793 
1794                         usbnet_skb_return(dev, ax_skb);
1795                 }
1796 
1797                 skb_pull(skb, size);
1798 
1799                 /* padding bytes before the next frame starts */
1800                 if (skb->len)
1801                         skb_pull(skb, align_count);
1802         }
1803 
1804         if (unlikely(skb->len < 0)) {
1805                 netdev_warn(dev->net, "invalid rx length<0 %d\n", skb->len);
1806                 return 0;
1807         }
1808 
1809         return 1;
1810 }
1811 
1812 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1813 {
1814         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1815         u16 high_16 = low_16 + skb->csum_offset;
1816         return (high_16 << 16) | low_16;
1817 }
1818 
1819 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1820                                          struct sk_buff *skb, gfp_t flags)
1821 {
1822         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1823         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1824         u32 tx_cmd_a, tx_cmd_b;
1825 
1826         /* We do not advertise SG, so skbs should be already linearized */
1827         BUG_ON(skb_shinfo(skb)->nr_frags);
1828 
1829         if (skb_headroom(skb) < overhead) {
1830                 struct sk_buff *skb2 = skb_copy_expand(skb,
1831                         overhead, 0, flags);
1832                 dev_kfree_skb_any(skb);
1833                 skb = skb2;
1834                 if (!skb)
1835                         return NULL;
1836         }
1837 
1838         if (csum) {
1839                 if (skb->len <= 45) {
1840                         /* workaround - hardware tx checksum does not work
1841                          * properly with extremely small packets */
1842                         long csstart = skb_checksum_start_offset(skb);
1843                         __wsum calc = csum_partial(skb->data + csstart,
1844                                 skb->len - csstart, 0);
1845                         *((__sum16 *)(skb->data + csstart
1846                                 + skb->csum_offset)) = csum_fold(calc);
1847 
1848                         csum = false;
1849                 } else {
1850                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1851                         skb_push(skb, 4);
1852                         cpu_to_le32s(&csum_preamble);
1853                         memcpy(skb->data, &csum_preamble, 4);
1854                 }
1855         }
1856 
1857         skb_push(skb, 4);
1858         tx_cmd_b = (u32)(skb->len - 4);
1859         if (csum)
1860                 tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1861         cpu_to_le32s(&tx_cmd_b);
1862         memcpy(skb->data, &tx_cmd_b, 4);
1863 
1864         skb_push(skb, 4);
1865         tx_cmd_a = (u32)(skb->len - 8) | TX_CMD_A_FIRST_SEG_ |
1866                 TX_CMD_A_LAST_SEG_;
1867         cpu_to_le32s(&tx_cmd_a);
1868         memcpy(skb->data, &tx_cmd_a, 4);
1869 
1870         return skb;
1871 }
1872 
1873 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1874 {
1875         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1876 
1877         dev->intf->needs_remote_wakeup = on;
1878 
1879         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1880                 return 0;
1881 
1882         /* this chip revision isn't capable of remote wakeup */
1883         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1884 
1885         if (on)
1886                 usb_autopm_get_interface_no_resume(dev->intf);
1887         else
1888                 usb_autopm_put_interface(dev->intf);
1889 
1890         return 0;
1891 }
1892 
1893 static const struct driver_info smsc95xx_info = {
1894         .description    = "smsc95xx USB 2.0 Ethernet",
1895         .bind           = smsc95xx_bind,
1896         .unbind         = smsc95xx_unbind,
1897         .link_reset     = smsc95xx_link_reset,
1898         .reset          = smsc95xx_reset,
1899         .rx_fixup       = smsc95xx_rx_fixup,
1900         .tx_fixup       = smsc95xx_tx_fixup,
1901         .status         = smsc95xx_status,
1902         .manage_power   = smsc95xx_manage_power,
1903         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1904 };
1905 
1906 static const struct usb_device_id products[] = {
1907         {
1908                 /* SMSC9500 USB Ethernet Device */
1909                 USB_DEVICE(0x0424, 0x9500),
1910                 .driver_info = (unsigned long) &smsc95xx_info,
1911         },
1912         {
1913                 /* SMSC9505 USB Ethernet Device */
1914                 USB_DEVICE(0x0424, 0x9505),
1915                 .driver_info = (unsigned long) &smsc95xx_info,
1916         },
1917         {
1918                 /* SMSC9500A USB Ethernet Device */
1919                 USB_DEVICE(0x0424, 0x9E00),
1920                 .driver_info = (unsigned long) &smsc95xx_info,
1921         },
1922         {
1923                 /* SMSC9505A USB Ethernet Device */
1924                 USB_DEVICE(0x0424, 0x9E01),
1925                 .driver_info = (unsigned long) &smsc95xx_info,
1926         },
1927         {
1928                 /* SMSC9512/9514 USB Hub & Ethernet Device */
1929                 USB_DEVICE(0x0424, 0xec00),
1930                 .driver_info = (unsigned long) &smsc95xx_info,
1931         },
1932         {
1933                 /* SMSC9500 USB Ethernet Device (SAL10) */
1934                 USB_DEVICE(0x0424, 0x9900),
1935                 .driver_info = (unsigned long) &smsc95xx_info,
1936         },
1937         {
1938                 /* SMSC9505 USB Ethernet Device (SAL10) */
1939                 USB_DEVICE(0x0424, 0x9901),
1940                 .driver_info = (unsigned long) &smsc95xx_info,
1941         },
1942         {
1943                 /* SMSC9500A USB Ethernet Device (SAL10) */
1944                 USB_DEVICE(0x0424, 0x9902),
1945                 .driver_info = (unsigned long) &smsc95xx_info,
1946         },
1947         {
1948                 /* SMSC9505A USB Ethernet Device (SAL10) */
1949                 USB_DEVICE(0x0424, 0x9903),
1950                 .driver_info = (unsigned long) &smsc95xx_info,
1951         },
1952         {
1953                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
1954                 USB_DEVICE(0x0424, 0x9904),
1955                 .driver_info = (unsigned long) &smsc95xx_info,
1956         },
1957         {
1958                 /* SMSC9500A USB Ethernet Device (HAL) */
1959                 USB_DEVICE(0x0424, 0x9905),
1960                 .driver_info = (unsigned long) &smsc95xx_info,
1961         },
1962         {
1963                 /* SMSC9505A USB Ethernet Device (HAL) */
1964                 USB_DEVICE(0x0424, 0x9906),
1965                 .driver_info = (unsigned long) &smsc95xx_info,
1966         },
1967         {
1968                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
1969                 USB_DEVICE(0x0424, 0x9907),
1970                 .driver_info = (unsigned long) &smsc95xx_info,
1971         },
1972         {
1973                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
1974                 USB_DEVICE(0x0424, 0x9908),
1975                 .driver_info = (unsigned long) &smsc95xx_info,
1976         },
1977         {
1978                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
1979                 USB_DEVICE(0x0424, 0x9909),
1980                 .driver_info = (unsigned long) &smsc95xx_info,
1981         },
1982         {
1983                 /* SMSC LAN9530 USB Ethernet Device */
1984                 USB_DEVICE(0x0424, 0x9530),
1985                 .driver_info = (unsigned long) &smsc95xx_info,
1986         },
1987         {
1988                 /* SMSC LAN9730 USB Ethernet Device */
1989                 USB_DEVICE(0x0424, 0x9730),
1990                 .driver_info = (unsigned long) &smsc95xx_info,
1991         },
1992         {
1993                 /* SMSC LAN89530 USB Ethernet Device */
1994                 USB_DEVICE(0x0424, 0x9E08),
1995                 .driver_info = (unsigned long) &smsc95xx_info,
1996         },
1997         { },            /* END */
1998 };
1999 MODULE_DEVICE_TABLE(usb, products);
2000 
2001 static struct usb_driver smsc95xx_driver = {
2002         .name           = "smsc95xx",
2003         .id_table       = products,
2004         .probe          = usbnet_probe,
2005         .suspend        = smsc95xx_suspend,
2006         .resume         = smsc95xx_resume,
2007         .reset_resume   = smsc95xx_resume,
2008         .disconnect     = usbnet_disconnect,
2009         .disable_hub_initiated_lpm = 1,
2010         .supports_autosuspend = 1,
2011 };
2012 
2013 module_usb_driver(smsc95xx_driver);
2014 
2015 MODULE_AUTHOR("Nancy Lin");
2016 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2017 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2018 MODULE_LICENSE("GPL");
2019 

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